Patent Description:
An advanced driver assistant system (ADAS for short) is an active security technology of collecting environmental data inside and outside a vehicle at the prime time by using various sensors mounted to the vehicle to perform technical processing such as identification, detection, and tracking of static and dynamic objects. This causes a driver to perceive a potential danger as quickly as possible, thereby attracting attention and improving security. Sensors adopted in the ADAS mainly include a camera, a radar, a laser, and an ultrasonic wave. Light, heat, pressure, or other variables for monitoring status of a vehicle can be detected. The sensors are generally located on front and rear bumpers, on a side mirror, inside a steering column, or on a windscreen of the vehicle. During use of the vehicle, vibration, collision, environmental temperature and humidity, and the like change physical mounting states of the foregoing sensors. Therefore, correction or calibration needs to be carried out from time to time.

During correction or calibration of the foregoing sensors, calibration elements are usually hung on the calibration bracket to correct or calibrate the sensors on the vehicle. However, most of current calibration brackets have relatively large volumes and are complicated to assemble and difficult to move.

<CIT> discloses a calibration bracket comprising a chassis, a bracket, and a horizontal axis configured to mount a laser emitting device. <CIT> relates to an automatic telescopic rod structure with a multi-section rod sleeve made of small shrinkage, which can be employed, e.g., as fishing rod, alpenstock, selfie stick and so on. <CIT> is directed to a telescopic flagpole including first to fourth tubes and first to third rotating joint shafts, which can be rotated by a rocker.

Embodiments of the disclosure are intended to provide a calibration system and a calibration bracket thereof, which can resolve the technical problem in the prior art that a calibration bracket has relatively large volumes and is difficult to move.

The embodiments of the disclosure adopt the following technical solution to resolve the technical problem.

According to one aspect, a calibration bracket is provided, including a base, a stand assembly and a support assembly, the support assembly being configured to mount a calibration element, the stand assembly including: a fixed vertical rod, one end of the fixed vertical rod being mounted to the base; a movable vertical rod mounted to another end of the fixed vertical rod, the movable vertical rod being movable relative to the fixed vertical rod only along a central axis, and the support assembly being mounted to the movable vertical rod; a driving mechanism, including a first threaded rotating member, a second threaded rotating member and a threaded fixed member, the first threaded rotating member being mounted to the fixed vertical rod and being rotatable relative to the fixed vertical rod only about the central axis, the second threaded rotating member having a first threaded structure and a second threaded structure spiraling about the central axis, a spiraling direction of the first threaded structure being the same as a spiraling direction of the second threaded structure, the second threaded rotating member being mounted to the first threaded rotating member through the first threaded structure and being mounted to the threaded fixed member through the second threaded structure, and the threaded fixed member being fixedly mounted to the movable vertical rod.

In some embodiments, the first threaded rotating member is inserted in the second threaded rotating member. The first threaded structure is disposed in the second threaded rotating member.

In some embodiments, the first threaded rotating member includes a first screw portion and a first limiting portion, the first limiting portion being disposed at an end of the first screw portion. The second threaded rotating member has a first screw hole and a first accommodating groove, the first screw hole being in communication with the first accommodating groove. The first threaded structure is disposed on a hole wall of the first screw hole. The first screw portion is inserted in the first screw hole. The first limiting portion is accommodated in the first accommodating groove. A cross-sectional dimension of the first limiting portion is greater than a cross-sectional dimension of the first screw portion.

In some embodiments, the second threaded rotating member is inserted in the first threaded rotating member. The first threaded structure is disposed outside the second threaded rotating member.

In some embodiments, the second threaded rotating member is inserted in the threaded fixed member. The second threaded structure is disposed outside the second threaded rotating member.

In some embodiments, the second threaded rotating member includes a second screw portion and a second limiting portion. The second limiting portion is disposed at an end of the second screw portion. The threaded fixed member has a second screw hole and a second accommodating groove. The second screw hole is in communication with the second accommodating groove. The second threaded structure is disposed on a hole wall of the second screw hole. The second screw portion is inserted in the second screw hole. The second limiting portion is accommodated in the second accommodating groove. A cross-sectional dimension of the second limiting portion is greater than a cross-sectional dimension of the second screw portion.

In some embodiments, the threaded fixed member is disposed in the second threaded rotating member. The second threaded structure is disposed in the second threaded rotating member.

In some embodiments, the driving mechanism further includes a hand wheel configured to drive the first threaded rotating member to rotate.

In some embodiments, the driving mechanism further includes a first helical gear and a second helical gear. The first helical gear is fixedly mounted to the first threaded rotating member. An axis of rotation of the first helical gear overlaps the central axis. The second helical gear is mounted to the fixed vertical rod. The second helical gear is rotatable relative to the fixed vertical rod about its axis of rotation. An axis of rotation of the second helical gear is perpendicular to the central axis. The first helical gear is meshed with the second helical gear.

The fixed vertical rod has a mounting separator plate. The first threaded rotating member includes a journal portion. The journal portion is disposed at the end of the first screw portion. The journal portion is inserted in the mounting separator plate. The cross-sectional dimension of the first screw portion is greater than a cross-sectional dimension of the journal portion. The first threaded rotating member is rotatable relative to the fixed vertical rod only about the central axis.

In some embodiments, the movable vertical rod is inserted in the fixed vertical rod. The movable vertical rod is movable relative to the fixed vertical rod along the central axis.

In some embodiments, cross-sections of both the movable vertical rod and the fixed vertical rod are non-circular.

In some embodiments, the movable vertical rod includes an inner rod portion and an outer rod portion. The inner rod portion is inserted in the outer rod portion. The outer rod portion is inserted in the fixed vertical rod. The threaded fixed member is fixedly mounted to the inner rod portion.

In some embodiments, the outer rod portion has a second sliding groove and a second snap-fit opening. The second sliding groove is in communication with the second snap-fit opening. The inner rod portion has a second stop portion. A cross-sectional dimension of the inner rod portion is less than a cross-sectional dimension of the second stop portion. The second stop portion is inserted in the second sliding groove. The inner rod portion is inserted in the second snap-fit opening.

In some embodiments, the fixed vertical rod includes a fixed vertical rod body and a foldable vertical rod portion. One end of the fixed vertical rod body is mounted to the base. Another end of the fixed vertical rod body is mounted to the foldable vertical rod portion. The foldable vertical rod portion is pivotably rotatable relative to the fixed vertical rod body. The movable vertical rod is mounted to the foldable vertical rod portion and is movable relative to the foldable vertical rod portion along the central axis. The first threaded rotating member is mounted to the foldable vertical rod portion and is rotatable relative to the foldable vertical rod portion only about the central axis.

In some embodiments, the fixed vertical rod has a first sliding groove and a first snap-fit opening. The first sliding groove is in communication with the first snap-fit opening. The movable vertical rod has a first stop portion. A cross-sectional dimension of the movable vertical rod is less than a cross-sectional dimension of the first stop portion. The first stop portion is inserted in the first sliding groove. The movable vertical rod is inserted in the first snap-fit opening.

In some embodiments, the support assembly is mounted to a top of the movable vertical rod.

According to another aspect, a calibration system is provided, including a calibration element and the foregoing calibration bracket. The calibration element is hung on the calibration bracket.

Compared with the prior art, in the calibration bracket of this embodiment, the first threaded rotating member, when rotating relative to the fixed vertical rod, can drive the second threaded rotating member, the threaded fixed member and the movable vertical rod to move toward the fixed vertical rod together. In this way, the volume of the calibration bracket is reduced, facilitating removal of the calibration bracket.

One or more embodiments are exemplarily described with reference to the corresponding figures in the accompanying drawings. The descriptions are not to be construed as limiting the embodiments. Elements in the accompanying drawings that have same reference numerals are represented as similar elements. Unless otherwise particularly stated, the figures in the accompanying drawings are not drawn to scale.

For ease of understanding the disclosure, the disclosure is described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, when a component is expressed as "being fixed to" another component, the component may be directly on the another component, or one or more intermediate components may exist between the component and the another component. When one component is expressed as "being connected to" another component, the component may be directly connected to the another component, or one or more intermediate components may exist between the component and the another component. In the description of this specification, orientations or position relationships indicated by terms such as "up", "down", "inside", "outside", "vertical", and "horizontal" are based on orientations or position relationships shown in the accompanying drawings. The orientations or position relationships are merely used for ease of description of the disclosure and for brevity of description, rather than indicating or implying that the mentioned apparatus or element needs to have a particular orientation or needs to be constructed and operated in a particular orientation. Therefore, the orientations or position relationships should not be understood as a limitation on the disclosure. In addition, terms "first" and "second" are merely used for description and should not be understood as indicating or implying relative importance.

Unless otherwise defined, meanings of all technical and scientific terms used in the specification are the same as those usually understood by those skilled in the art of the disclosure. Terms used in the specification of the disclosure are merely intended to describe objectives of the specific embodiment, and are not intended to limit the disclosure. The term "and/or" used in this specification includes any or all combinations of one or more related listed items.

In addition, technical features involved in different embodiments of the disclosure described below may be combined together if there is no conflict.

Referring to <FIG>, <FIG> and <FIG> together, a calibration bracket <NUM> provided in an embodiment of the disclosure includes a base <NUM>, a stand assembly <NUM> and a support assembly <NUM>. The stand assembly <NUM> is fixedly connected to the base <NUM>. The support assembly <NUM> includes a first beam portion <NUM>, a second beam portion <NUM> and a connecting portion <NUM>. The connecting portion <NUM> is mounted to the stand assembly <NUM>. One end of the connecting portion <NUM> is hinged to the first beam portion <NUM>. Another end of the connecting portion <NUM> is hinged to the second beam portion <NUM>. The first beam portion <NUM> and the second beam portion <NUM> can respectively rotate toward each other relative to the connecting portion <NUM>, to fold the support assembly <NUM>. The first beam portion <NUM> and the second beam portion <NUM> can also respectively rotate away from each other relative to the connecting portion <NUM>, to unfold the support assembly <NUM>.

The "mounting" includes fixed mounting such as welding mounting as well as detachable mounting.

The support assembly <NUM> may be configured to hang a calibration element, for example, a multi-line laser <NUM>, a calibration target, a radar reflection or absorption apparatus, and the like, to calibrate a vehicle-mounted driver assistant system.

In the calibration bracket <NUM> of this embodiment, the first beam portion <NUM> and the second beam portion <NUM> can pivotally rotate relative to the connecting portion <NUM>, respectively, to fold the support assembly <NUM>. In this way, the volume of the calibration bracket <NUM> can be reduced to facilitate shipment.

The first beam portion <NUM>, the second beam portion <NUM> and the connecting portion <NUM> constitute a beam.

Optionally, the support assembly is mounted on the top surface of a movable vertical rod. In this way, a center of gravity of the support assembly is closer to a center of gravity of the vertical rod compared with a traditional calibration bracket. Stability of the calibration bracket can be improved and a base with a smaller area can be used.

Optionally, the first beam portion <NUM> and the second beam portion <NUM> can rotate toward each other relative to the connecting portion <NUM>. For example, the first beam portion and the second beam portion can be folded together downward, upward, forward, and backward. Optionally, when the first beam portion <NUM> and the second beam portion <NUM> are folded downward, a length of the connecting portion <NUM> can be relatively short, and the first beam portion <NUM> and the second beam portion <NUM> are in a drooping state. In this way, the support assembly <NUM> does not need to be removed from the stand assembly <NUM>. Space occupied by the calibration bracket <NUM> will be significantly reduced. Therefore, the calibration bracket can be carried conveniently in vehicles. When the first beam portion <NUM> and the second beam portion <NUM> are folded upward, forward and backward, a device for rotating the beam may be disposed. The first beam portion <NUM> and the second beam portion <NUM> are finally folded downward, or may be in a drooping state. Alternatively, the length of the connecting portion <NUM> can be made relatively long. The first beam portion <NUM> and the second beam portion <NUM> can be placed close to the connecting portion <NUM> after being folded and can be fixed to the connecting portion <NUM> by using a releasable fixing device. In the latter case, in order to further reduce the space occupied by the calibration bracket <NUM>, the support assembly <NUM> may be removed from the stand assembly <NUM> and then mounted to the stand assembly <NUM> after being carried to a required place.

Those skilled in the art may understand that the manner of folding the support assembly <NUM> is not limited to the foregoing manners. For example, the beam may be folded into two sections, and there is no connecting portion <NUM> at this time. The beam may also be folded into four or more sections. However, three sections are preferred, because in this case a middle section of the beam has no fracture. In this way, the beam can be stably fixed onto the vertical rod by using only one fastening component at the middle section.

The base <NUM> includes a base body <NUM>, a roller <NUM>, a height adjustment member <NUM> and a pull ring <NUM>.

The base body <NUM> has a triangular claw shape and includes three claws extending in three different directions. The base body <NUM> may be made of a metal material.

The roller <NUM> is mounted to a bottom surface of the base body <NUM>, and there may be three rollers <NUM>. Each of the rollers <NUM> is mounted to an end of a corresponding one of the claws to facilitate movement of the base body <NUM>. In this embodiment, the roller <NUM> is an omni-directional moving roller, so that the base body <NUM> can move toward any direction.

The height adjustment member <NUM> is mounted to the base body <NUM> for adjusting a height of the base body <NUM>. In this embodiment, the height adjustment member <NUM> is an adjustment knob. There are three height adjustment members. There is at least one section of screw rod under the knob. The screw rod is mated with threads of a through hole at the base to implement height adjustment. Each of the height adjustment members <NUM> is mounted to a corresponding one of the claws and is close to a corresponding one of the rollers <NUM>. The three height adjustment members <NUM> are distributed in a regular triangle.

The pull ring <NUM> can be mounted to an upper surface of one of the claws to facilitate pulling of the calibration bracket <NUM>.

It may be understood that, in some other embodiments, a shape of the base body <NUM> may vary according to an actual requirement, and is not limited to a triangle claw shape. For example, the base body <NUM> may be a rectangle or a circle. The number of rollers <NUM> and height adjustment members <NUM> can be increased or decreased according to actual needs. For example, the triangular-claw-shaped base body <NUM> may be provided with two height adjustment members and mated with a foot with a fixed height, to adjust the angle of the base body <NUM>.

Referring to <FIG> and <FIG> together, the stand assembly <NUM> may include a fixed vertical rod <NUM>, a movable vertical rod <NUM> and a driving mechanism <NUM>. The movable vertical rod <NUM> is sleeved in the fixed vertical rod <NUM>. The movable vertical rod is movable along a length direction of the fixed vertical rod <NUM> relative to the fixed vertical rod <NUM>. The driving mechanism <NUM> is mounted to the fixed vertical rod <NUM> for driving the movable vertical rod <NUM> to move along the length direction of the fixed vertical rod <NUM> relative to the fixed vertical rod <NUM>. By connecting the movable vertical rod <NUM> and the fixed vertical rod <NUM> in a sleeving manner, a height of the stand assembly <NUM> can be reduced to nearly half of an original height. In addition, the cross bar assembly <NUM> is folded. The stand assembly <NUM> can be very suitable to be carried in a trunk of a transportation means such as a vehicle.

It may be understood that the fixed vertical rod may also be used as an inner rod and the movable vertical rod as an outer rod as required. The driving mechanism <NUM> is mounted to the fixed vertical rod <NUM> and configured to drive the movable vertical rod <NUM> to move in the length direction of the fixed vertical rod <NUM> relative to the fixed vertical rod <NUM>.

Optionally, the fixed vertical rod <NUM> and the movable vertical rod <NUM> are square tubes. The movable vertical rod <NUM> is closely sleeved in the fixed vertical rod <NUM>. The movable vertical rod <NUM> can move only in the length direction of the fixed vertical rod <NUM> relative to the fixed vertical rod <NUM>. The movable vertical rod <NUM> can be prevented from moving in other directions relative to the fixed vertical rod <NUM>. This configuration is very important for the calibration bracket <NUM> to be foldable, because during the calibration, a fixed relative position relationship between components of the calibration bracket <NUM> is required. For example, a laser may need to be fixed on an outer surface of the fixed vertical rod <NUM>, and a center axis of the vehicle is positioned by using the laser. Therefore, a relative position between a target carried on the support assembly <NUM> and the vehicle is determined. Therefore, even a slight change in relative positions between the components affects calibration accuracy or requires an additional tuning mechanism for compensation. If the relative positions between the components change greatly, the additional tuning mechanism may fail. Therefore, in the sleeving mode, relative movement, such as relative rotation between the movable vertical rod <NUM> and the fixed vertical rod <NUM> other than relative movement in the length direction needs to be eliminated. A simple method is that both the movable vertical rod <NUM> and the fixed vertical rod <NUM> are square tubes. The method can ensure that only relative movement in the length direction occurs therebetween.

It may be understood that, in some other embodiments, the fixed vertical rod <NUM> and the movable vertical rod <NUM> may also be tubes of other shapes, for example, tubes with mutually matched polygonal cross-sections. The movable vertical rod <NUM> can move along the length direction of the fixed vertical rod <NUM> relative to the fixed vertical rod <NUM>. The movable vertical rod <NUM> can be prevented from moving toward other directions relative to the fixed vertical rod <NUM>. The expression "matching each other" herein does not necessarily require that the cross-sections of the fixed vertical rod <NUM> and the movable vertical rod <NUM> need to be the same. For example, the cross-section of the fixed vertical rod <NUM> disposed outside may be hexagonal. The cross-section of the movable vertical rod <NUM> disposed inside may be a quadrilateral connected to the hexagon. The movable vertical rod <NUM> can also be caused to move only in the length direction of the fixed vertical rod <NUM> relative to the fixed vertical rod <NUM>. The cross-sections of the fixed vertical rod <NUM> and the movable vertical rod <NUM> may also be elliptical cylindrical tubes matching each other. The elliptical cross-section can also restrict the relative rotation between the fixed vertical rod and the movable vertical rod to a specific extent.

The fixed vertical rod <NUM> and the movable vertical rod <NUM> may also be cylindrical tubes with a circular cross-section. In this case, the fixed vertical rod <NUM> can be prevented, by using a guide mechanism, from rotating relative to the movable vertical rod <NUM>. The guide mechanism is configured to guide the movable vertical rod <NUM> to move stably relative to the fixed vertical rod <NUM>. Alternatively, a mechanism for detecting and adjusting the movement of the fixed vertical rod <NUM> relative to the movable vertical rod <NUM> in other directions other than the length direction is additionally disposed on other components of the calibration bracket <NUM>. A simple guide mechanism is a guide rail and a slider apparatus matching the guide rail. The guide mechanism may be provided on a surface at which the fixed vertical rod <NUM> is in contact with the movable vertical rod <NUM>. A guide rail is disposed on one of the fixed vertical rod and the movable vertical rod. A slider apparatus such as a bump, a plastic rubber strip, a roller, a ball, a gear, and the like is disposed on the other. In this case, the slider apparatus is restricted to move on the guide rail. It can also be ensured that only the relative movement in the length direction occurs between the two vertical rods. The guide rail may be a groove, a linear protrusion, a rack, and the like additionally disposed on the tube wall of the vertical rod, or may be a groove, a linear protrusion, a groove formed between two linear protrusions, and the like formed by the tube wall of the vertical rod. In other words, the vertical rod uses a special-shaped tube wall. The tube wall has a part that can be used as the guide rail, such as a groove, a linear protrusion, and the like. Similarly, the slider apparatus may be an additional component that is additionally disposed on the tube wall of the vertical rod. The slider apparatus may alternatively be a protruding structure formed by the tube wall of the vertical rod without a need to dispose additional components on the tube wall of the vertical rod. In addition, a mechanism that achieves transmission through meshing such as a rack also has a guiding effect, and therefore is classified as a type of guide rail in this specification. Transmission mechanisms such as a gear and a rack described in the following embodiments can also achieve a guiding effect. Optionally, the rack may be disposed in the groove guide rail.

It may be understood that positions for disposing the guide rail and the slider apparatus may be transposed. The guide rail may be disposed on the movable vertical rod. The slider apparatus may be disposed on the fixed vertical rod, or the positions for disposing the guide rail and the slider apparatus may be transposed.

It may be understood that the guide mechanism is not limited to being used for the fixed vertical rod <NUM> and the movable vertical rod <NUM> with a circular cross-section. The fixed vertical rod <NUM> and the movable vertical rod <NUM> with other cross-sectional shapes may also use the guide mechanism to enhance a guiding effect and obtain more stable or less frictional relative movement. For non-circular cross-sectional shapes, the guide rail may also not be used. However, only a linear motion apparatus is used to obtain more stable or less frictional relative movement. In this case, the non-circular external vertical rod plays a guiding role.

Referring to <FIG> together, the fixed vertical rod <NUM> may include a fixed vertical rod body <NUM> and a foldable vertical rod portion <NUM>. One end of the fixed vertical rod body <NUM> is fixedly mounted to the base <NUM>. Another end of the fixed vertical rod body <NUM> is hinged to one end of the foldable vertical rod portion <NUM>. Another end of the foldable vertical rod portion <NUM> is mounted to the movable vertical rod <NUM>. The movable vertical rod <NUM> is movable relative to the foldable vertical rod portion <NUM> in a length direction of the foldable vertical rod portion <NUM>.

In the calibration bracket <NUM> of this embodiment, the foldable vertical rod portion <NUM> can pivotally rotate relative to the fixed vertical rod body <NUM>. The support assembly <NUM> is foldable, thereby reducing a height of the calibration bracket <NUM> to facilitate transportation.

The movable vertical rod <NUM> may include an inner rod portion <NUM> and an outer rod portion <NUM>. The inner rod portion <NUM> is inserted in the outer rod portion <NUM>. The inner rod portion <NUM> is movable relative to the outer rod portion <NUM> in the length direction of the foldable vertical rod portion <NUM>. The outer rod portion <NUM> is inserted in the foldable vertical rod portion <NUM>. The outer rod portion <NUM> is movable relative to the foldable vertical rod portion <NUM> in the length direction of the foldable vertical rod portion <NUM>. The driving mechanism <NUM> is configured to drive the inner rod portion <NUM> to move relative to the foldable vertical rod portion <NUM>. The inner rod portion <NUM> is inserted in the outer rod portion <NUM>. The outer rod portion <NUM> is inserted in the foldable vertical rod portion <NUM>. The height of the stand assembly <NUM> can be reduced to nearly one-third of the original height, which improves the portability of the stand assembly <NUM>. In addition, only one driving mechanism <NUM> can drive both the outer rod portion <NUM> and the inner rod portion <NUM> to move relative to the foldable vertical rod portion <NUM>. The weight of the stand assembly <NUM> is basically not increased.

It may be understood that, on the one hand, according to actual conditions, the outer rod portion <NUM> may further include a plurality of sleeve rods. One of the plurality of sleeve rods is inserted in the adjacent other.

In this embodiment, referring to <FIG>, the foldable vertical rod portion <NUM> has a first sliding groove <NUM> and a first snap-fit opening <NUM>. The first snap-fit opening <NUM> is in communication with the first sliding groove <NUM>. A cross-sectional dimension of the first snap-fit opening <NUM> is less than a cross-sectional dimension of the first sliding groove <NUM>. A first stop portion <NUM> is provided at an end of the outer rod portion <NUM>. A cross-sectional dimension of the first stop portion <NUM> is greater than a cross-sectional dimension of the outer rod portion <NUM>. The first stop portion <NUM> is inserted in the first sliding groove <NUM>. The outer rod portion <NUM> is inserted in the first snap-fit opening <NUM>. The first stop portion <NUM> abuts against a junction of the first sliding groove <NUM> and the first snap-fit opening <NUM>. The outer rod portion <NUM> can be prevented from being detached from the foldable vertical rod portion <NUM>.

In this embodiment, referring to <FIG> again, the outer rod portion <NUM> has a second sliding groove <NUM> and a second snap-fit opening <NUM>. The second snap-fit opening <NUM> is in communication with the second sliding groove <NUM>. A cross-sectional dimension of the second snap-fit opening <NUM> is less than a cross-sectional dimension of the second sliding groove <NUM>. The inner rod portion <NUM> has a second stop portion <NUM>. A cross-sectional dimension of the second stop portion <NUM> is greater than a cross-sectional dimension of the inner rod portion <NUM>. The second stop portion <NUM> is inserted in the second sliding groove <NUM>. The inner rod portion <NUM> is inserted in the second snap-fit opening <NUM>. The second stop portion <NUM> abuts against a junction of the second sliding groove <NUM> and the second snap-fit opening <NUM>. The inner rod portion <NUM> can be prevented from being detached from the outer rod portion <NUM>.

Referring to <FIG> together, the driving mechanism <NUM> includes a first threaded rotating member <NUM>, a second threaded rotating member <NUM>, a threaded fixed member <NUM>, a first helical gear <NUM>, a second helical gear <NUM> and a hand wheel <NUM>.

The first threaded rotating member <NUM> is mounted to the foldable vertical rod portion <NUM>. The first threaded rotating member <NUM> is rotatable relative to the foldable vertical rod portion <NUM> only about a central axis O. The central axis O is substantially parallel to the length direction of the foldable vertical rod portion <NUM>.

The second threaded rotating member <NUM> has a first threaded structure (not shown) and a second threaded structure (not shown) spiraling about the central axis O. A spiraling direction of the first threaded structure is the same as a spiraling direction of the second threaded structure. The second threaded rotating member <NUM> is mounted to the first threaded rotating member <NUM> through the first threaded structure. The second threaded rotating member <NUM> is mounted to the threaded fixed member <NUM> through the second threaded structure. The threaded fixed member <NUM> is fixedly mounted to the inner rod portion <NUM>.

The first threaded rotating member <NUM> rotates relative to the foldable vertical rod portion <NUM>. The second threaded rotating member <NUM> is driven to rotate relative to one of the first threaded rotating member <NUM> and the threaded fixed member <NUM>. In other words, in one case, when the first threaded rotating member <NUM> rotates relative to the foldable vertical rod portion <NUM>, the second threaded rotating member <NUM> is stationary relative to the first threaded rotating member <NUM>. At this point, the threaded fixed member <NUM> moves relative to the first threaded rotating member <NUM> and the second threaded rotating member <NUM>. In another case, when the first threaded rotating member <NUM> rotates relative to the foldable vertical rod portion <NUM>, the second threaded rotating member <NUM> is stationary relative to the threaded fixed member <NUM>. At this point, both the second threaded rotating member <NUM> and the threaded fixed member <NUM> move relative to the first threaded rotating member <NUM>. In actual use, when the first threaded rotating member <NUM> continuously rotates relative to the foldable vertical rod portion <NUM>, the above two cases may occur alternately. The inner rod portion <NUM> is driven to move relative to the foldable vertical rod portion <NUM> through the first threaded rotating member <NUM>, the second threaded rotating member <NUM> and the threaded fixed member <NUM>. On the one hand, during the movement of the inner rod portion <NUM> toward the foldable vertical rod portion <NUM>, since the second threaded rotating member <NUM> also moves toward the foldable vertical rod portion <NUM>, the second threaded rotating member <NUM> disposed in the rod member will not limit a stroke of the inner rod portion <NUM> and does not protrude from the inner rod portion <NUM>. The stand assembly <NUM> is more convenient to carry. On the other hand, since the first threaded rotating member, the second threaded rotating member and the threaded fixed member are all connected by using threads. After the inner rod portion <NUM> is moved to a designated position relative to the foldable vertical rod portion <NUM>, the driving mechanism <NUM> can be self-locked.

The first threaded rotating member <NUM> includes a journal portion <NUM>, a first screw portion <NUM> and a first limiting portion <NUM>. The first journal portion <NUM> is disposed at one end of the first screw portion <NUM>. The first limiting portion <NUM> is disposed on another end of the first screw portion <NUM>. A cross-sectional dimension of the first journal portion <NUM> is less than a cross-sectional dimension of the first screw portion <NUM>. The cross-sectional dimension of the first screw portion <NUM> is less than a cross-sectional dimension of the first limiting portion <NUM>.

A mounting separator plate <NUM> is provided in the foldable vertical rod portion <NUM>. The mounting separator plate <NUM> is substantially horizontal. The journal portion <NUM> is inserted in the mounting separator plate <NUM>. Since the first threaded rotating member <NUM>, the second threaded rotating member <NUM> and the threaded fixed member <NUM> are connected by using threads. The first screw portion <NUM> abuts against the mounting separator plate <NUM>. The first threaded rotating member <NUM> is rotatable relative to the foldable vertical rod portion <NUM> only about the central axis O. In addition, the mounting separator plate <NUM> can limit a position of the second threaded rotating member <NUM>. When the first threaded rotating member <NUM> rotates to cause the second threaded rotating member <NUM> to abut against the mounting separator plate <NUM>, the first threaded rotating member <NUM> continues to rotate, and the second threaded rotating member <NUM> remains stationary with respect to the first threaded rotating member <NUM>. The threaded fixed member <NUM> moves toward the foldable vertical rod portion <NUM> until the threaded fixed member <NUM> also abuts against the mounting separator plate <NUM>. At this point, the first threaded rotating member <NUM> cannot continue to rotate.

In some other embodiments, the second threaded rotating member <NUM> is inserted in the first threaded rotating member <NUM>. The first threaded structure is disposed outside the second threaded rotating member <NUM>.

In this embodiment, the first threaded rotating member <NUM> is inserted in the second threaded rotating member <NUM>. The first threaded structure is disposed in the second threaded structure.

The second threaded rotating member <NUM> includes a second screw portion <NUM> and a second limiting portion <NUM>. The second limiting portion <NUM> is disposed at an end of the second screw portion <NUM>. A cross-sectional dimension of the second screw portion <NUM> is less than a cross-sectional dimension of the second limiting portion <NUM>. The second screw portion <NUM> has a first screw hole <NUM> and a first accommodating groove <NUM>. The first screw hole <NUM> is in communication with the first accommodating groove <NUM>. In addition, a cross-sectional dimension of the first screw hole <NUM> is less than a cross-sectional dimension of the first accommodating groove <NUM>. The first threaded structure is disposed on a hole wall of the first screw hole <NUM>.

The first screw portion <NUM> is inserted in the first screw hole <NUM>. The limiting portion <NUM> is accommodated in the first accommodating groove <NUM>. The first limiting portion <NUM> is disposed at an end of the first screw portion <NUM>. During the rotation of the first threaded rotating member <NUM>, when the second threaded rotating member <NUM> can move to a position in which the first limiting portion <NUM> abuts against a junction of the first screw hole <NUM> and the first accommodating groove <NUM>, the first threaded rotating member <NUM> continues to rotate, and the second threaded rotating member <NUM> remains stationary with respect to the first threaded rotating member <NUM>. The threaded fixed member <NUM> moves away from the foldable vertical rod portion <NUM>.

In some other embodiments, the threaded fixed member <NUM> is inserted in the second threaded rotating member <NUM>. The second threaded structure is disposed in the second threaded rotating member <NUM>.

In this embodiment, the second threaded rotating member <NUM> is inserted in the threaded fixed member <NUM>. The second threaded structure is disposed outside the second threaded rotating member <NUM>.

The threaded fixed member <NUM> has a second screw hole <NUM> and a second accommodating groove <NUM>. The second screw hole <NUM> is in communication with the second accommodating groove <NUM>. A cross-sectional dimension of the second screw hole <NUM> is less than a cross-sectional dimension of the second accommodating groove <NUM>. The second threaded structure is disposed on a hole wall of the second screw hole <NUM>.

The second screw portion <NUM> is inserted in the second screw hole <NUM>. The second limiting portion <NUM> is accommodated in the second accommodating groove <NUM>. The second limiting portion <NUM> is disposed at an end of the second screw portion <NUM>. During the rotation of the first threaded rotating member <NUM>, when the second threaded rotating member <NUM> can move to a position in which the second limiting portion <NUM> abuts against a junction of the second screw hole <NUM> and the second accommodating groove <NUM>, the first threaded rotating member <NUM> continues to rotate, and the second threaded rotating member <NUM> remains stationary with respect to the threaded fixed member <NUM>. The second threaded rotating member <NUM> and the threaded fixed member <NUM> together move away from the foldable vertical rod portion <NUM>.

One end of the journal portion <NUM> is connected to the first screw portion <NUM>. The first helical gear <NUM> is fixedly mounted to another end of the journal portion <NUM>. An axis of rotation of the first helical gear <NUM> overlaps the central axis O. The first helical gear <NUM> and the first screw portion <NUM> can rotate together.

The second helical gear <NUM> is mounted to the foldable vertical rod portion <NUM>. The second helical gear <NUM> is rotatable relative to the foldable vertical rod portion <NUM> about its axis of rotation, and an axis of rotation of the second helical gear <NUM> is perpendicular to the central axis O.

The hand wheel <NUM> is fixedly mounted to the second helical gear <NUM>. The hand wheel <NUM> and the second helical gear <NUM> can rotate together. The first threaded rotating member <NUM> can be driven to rotate through the hand wheel <NUM>.

Referring to <FIG> and <FIG>, in some embodiments, the driving mechanism <NUM> is omitted. The stand assembly <NUM> further includes a fastening mechanism <NUM> and an elastic body <NUM>.

The fastening mechanism <NUM> may be mounted to one end of the fixed vertical rod <NUM> and configured to fix the movable vertical rod <NUM> to the fixed vertical rod <NUM>. The fastening mechanism <NUM> includes a fastening ring <NUM> and a bolt <NUM>. The fastening ring <NUM> is sleeved on the fixed vertical rod <NUM>. The fastening ring <NUM> may be formed by bending a metal strip. The bolt <NUM> is mounted to two ends of the fastening ring <NUM>.

The elastic body <NUM> is located in the fixed vertical rod <NUM> and the movable vertical rod <NUM>. The elastic body <NUM> is compressed between the bottom of the fixed vertical rod <NUM> and the movable vertical rod <NUM>. The elastic body <NUM> may be connected to the movable vertical rod <NUM> at a position at the bottom, the top or the middle of the movable vertical rod <NUM> as required. When the movable vertical rod <NUM> moves to a position closest to the bottom of the fixed vertical rod, the elastic body is in a compressed state. In this embodiment, the elastic body <NUM> is a compression spring. It may be understood that, in some other embodiments, the elastic body <NUM> may be other elastic elements such as an elastic piece, a pneumatic rod, a hydraulic rod, or the like.

When the movable vertical rod <NUM> needs to be raised relative to the fixed vertical rod <NUM>, the bolt <NUM> is rotated. The fastening ring <NUM> loosens the fixed vertical rod <NUM>. An upward force is applied on the movable vertical rod <NUM>. The movable vertical rod <NUM> can rise in the length direction of the fixed vertical rod <NUM>. By virtue of an elastic force of the elastic body <NUM>, an external force, for example, an external force to be applied by an operator, to be applied on the movable vertical rod <NUM> can be reduced. When a required position is reached, the bolt <NUM> is rotated to fasten the fixed vertical rod <NUM>. The movable vertical rod <NUM> is fixed at the required position. When the movable vertical rod <NUM> needs to be lowered relative to the fixed vertical rod <NUM>, the bolt <NUM> is rotated. The fastening ring <NUM> loosens the fixed vertical rod <NUM>. Under the gravity of the movable vertical rod <NUM> and the support assembly <NUM>, the movable vertical rod <NUM> can fall in the length direction of the fixed vertical rod <NUM>. By virtue of the elastic force of the elastic body <NUM>, a falling speed of the movable vertical rod <NUM> can be reduced. Damage caused by collision on the vertical rod <NUM> due to an excessively large falling speed of the movable vertical rod <NUM> can be avoided.

It may be understood that, in some other embodiments, the fastening mechanism <NUM> may also be other structures, so long as the movable vertical rod <NUM> can be fixed at a required position. For example, the fastening mechanism <NUM> may be a screw. The screw passes through the fixed vertical rod <NUM> to be in screw-thread fit with the fixed vertical rod <NUM>. When the movable vertical rod <NUM> moves to the required position relative to the fixed vertical rod <NUM>, the screw is rotated to abut against the movable vertical rod <NUM>. The movable vertical rod <NUM> is fixed at the required position. The screw is rotated to be detached from the movable vertical rod <NUM>. The movable vertical rod <NUM> can move in the length direction of the fixed vertical rod <NUM> relative to the fixed vertical rod <NUM>.

Referring to <FIG>, <FIG>, the support assembly <NUM> includes a first supporting rod <NUM>, the first beam portion <NUM>, a second supporting rod <NUM>, the second beam portion <NUM>, a mounting seat <NUM>, the connecting portion <NUM>, an adjustment mechanism <NUM> and a joint mechanism <NUM>. The first supporting rod <NUM> and the second supporting rod <NUM> are configured to support a target to prevent falling, especially when the target has relatively large area and weight.

One end of the first supporting rod <NUM> can be pivotally connected to the first beam portion <NUM> through a hinge mechanism, and the like. The first supporting rod <NUM> can rotate relative to the first beam portion <NUM> to be unfolded to be perpendicular to the first beam portion <NUM> and engaged with and parallel to the first beam portion <NUM>.

The first supporting rod <NUM> includes a first supporting rod body <NUM> and a first supporting member <NUM>. One end of the first supporting rod body <NUM> is hinged to the first beam portion <NUM>. The first supporting member <NUM> is mounted at another end of the first supporting rod body <NUM>. A side wall of the first supporting rod body <NUM> is provided with a first slot (not shown).

Similarly, one end of the second supporting rod <NUM> can be pivotally connected to the second beam portion <NUM> through a hinge mechanism, and the like. The second supporting rod <NUM> can rotate relative to the second beam portion <NUM> to be unfolded to be perpendicular to the second beam portion <NUM> and engaged with and parallel to the second beam portion <NUM>. The second supporting rod <NUM> includes a second supporting rod body <NUM> and a second supporting member <NUM>. One end of the second supporting rod body <NUM> is hinged to the second beam portion <NUM>. The second supporting member <NUM> is mounted at another end of the second supporting rod body <NUM>. A side wall of the second supporting rod body <NUM> is provided with a second slot <NUM>. The first supporting member <NUM> and the second supporting member <NUM> extend in the same direction. When the first supporting rod <NUM> is unfolded to be perpendicular to the first beam portion <NUM>, and the second supporting rod <NUM> is unfolded to be perpendicular to the second beam portion <NUM>, the first slot and the second slot <NUM> are arranged oppositely. The first supporting member <NUM> and the second supporting member <NUM> can be used to jointly support a calibration element, such as a pattern plate.

The first beam portion <NUM> is provided with a first fixture block <NUM> and a first guide rail <NUM>. The first fixture block <NUM> and the first supporting rod <NUM> are both connected to the same side of the first beam portion <NUM>. When the first supporting rod <NUM> is rotated to be parallel to the first beam portion <NUM>, the first fixture block <NUM> is engaged into the first slot, and the first supporting rod <NUM> is snapped into the first beam portion <NUM>. The first guide rail <NUM> is disposed on the other side of the first beam portion <NUM> and parallel to the first beam portion <NUM>. The first guide rail <NUM> is configured to mount a widget for mounting the calibration element. For example, the first guide rail is configured to mount a calibration target, a reflector, a laser, and the like. The widget can slide along the first guide rail <NUM>.

Similarly, the second beam portion <NUM> is provided with a second fixture block <NUM> and a second guide rail <NUM>. The second fixture block <NUM> and the second supporting rod <NUM> are both connected to the same side of the second beam portion <NUM>. When the second supporting rod <NUM> is rotated to be parallel to the second beam portion <NUM>, the second fixture block <NUM> is engaged into the second slot <NUM>, and the second supporting rod <NUM> is snapped into the second beam portion <NUM>. The second guide rail <NUM> is disposed on the other side of the second beam portion <NUM> and parallel to the second beam portion <NUM>. The second guide rail <NUM> is configured to mount a widget for mounting the calibration element. For example, the second guide rail is configured to mount a reflector, and the like. The widget can slide along the second guide rail <NUM>. The first guide rail <NUM> and the second guide rail <NUM> are disposed symmetrically relative to the connecting portion <NUM>, and the first beam portion <NUM> and the second beam portion <NUM> are also disposed symmetrically relative to the connecting portion <NUM>. When the base <NUM> is placed on a horizontal plane, the first guide rail <NUM>, the second guide rail <NUM>, the first beam portion <NUM> and the second beam portion <NUM> are all horizontally disposed.

It may be understood that, in some other embodiments, the positions of the first fixture block <NUM> and the first slot can be interchanged. That is to say, the first fixture block <NUM> is mounted to the first supporting rod body <NUM>. The first slot is disposed on the first beam portion <NUM>. Similarly, the positions of the second fixture block <NUM> and the second slot <NUM> may also be interchanged. That is to say, the second fixture block <NUM> is mounted to the second supporting rod body <NUM>. The second slot <NUM> is disposed on the second beam portion <NUM>. Optionally, the first slot and the second slot <NUM> are recessed in the corresponding beam portions.

It may be understood that, in some other embodiments, the first guide rail <NUM> and the second guide rail <NUM> may be disposed on other surfaces, such as the top surface of the beam. In some other embodiments, the first guide rail <NUM> and the second guide rail <NUM> do not need to be disposed. The calibration element may be directly hung on the beam by using a hook or the like. The first guide rail <NUM> and the second guide rail <NUM> can also have other forms, which are not necessarily shown in the figure. For example, the guide rail can be one or more groove lines arranged on the top surface of the beam. The outer wall of the beam can be used to form the groove line without mounting additional guide rails.

It may be understood that a number of supporting rods is not limited by the foregoing embodiment. For example, there may be only one supporting rod that is disposed at an approximately central position of the connecting portion <NUM>. In this case, the target located at the approximately central position of the support assembly <NUM> can also be well supported. When the target used for calibration is at other positions, the supporting rod may also be disposed at a corresponding position for supporting. There may be more than two supporting rods. In addition, the supporting rod can also be disposed on a rail. The rail is disposed on a side surface or a bottom surface of the support assembly <NUM>. The supporting rod can move along the assembled support assembly <NUM>, so as to lift, at a suitable position, the targets that may be at different positions.

It may be understood that when the guide rail is used to make the supporting rod movable, the supporting rod can also be snapped onto the support assembly <NUM> by using a fixture block and a slot.

The connecting portion <NUM> of the beam is sleeved in the mounting base <NUM>. A first surface <NUM> of the connecting portion <NUM> is recessed with positioning holes <NUM>. Preferably, there are two positioning holes <NUM>, which are disposed in a length direction of the connecting portion <NUM>.

Referring to <FIG>, the connecting portion <NUM> is provided with a fixing groove <NUM>. A fixing surface <NUM> is disposed in the fixing groove <NUM>. The fixing groove <NUM> is used in conjunction with a fixing rod <NUM> in <FIG> to fix the support assembly onto the mounting base <NUM>. Optionally, the fixing groove <NUM> is provided so that the fixing surface <NUM> and the bottom surface of the mounting seat <NUM> are at a certain angle. The advantages of this arrangement are described in combination with the fixing rod in <FIG>. For example, the fixing groove <NUM> may be disposed between a second surface <NUM> and a top surface of the beam. The second surface <NUM> is arranged parallel to the first surface <NUM>. An included angle is formed between the fixing surface <NUM> and the first surface <NUM> and the second surface <NUM>. For example, the fixing surface <NUM> is disposed at <NUM> degrees with the first surface <NUM> and the second surface <NUM>.

In this embodiment, the first beam portion <NUM>, the second beam portion <NUM> and the connecting portion <NUM> are all square tubes. Therefore, the weight of the calibration bracket <NUM> can be reduced, and the connecting portion <NUM> is easy to be firmly sleeved in the adjustment mechanism <NUM>. It may be understood that, in some other embodiments, the first beam portion <NUM>, the second beam portion <NUM> and the connecting portion <NUM> may also be tubes of other shapes, special-shaped materials, rods, or the like. For example, the beam portions and the connecting portion may be polygonal or circular tubes or rods. When the beam is a tube of other shapes, the fixing groove <NUM> may be disposed at a position at which a specific angle can be formed between the fixing surface <NUM> and the bottom surface of the mounting base <NUM>.

Referring to <FIG> and <FIG>, the mounting base <NUM> is configured to sleeve the connecting portion <NUM>. The mounting base <NUM> includes a holder <NUM>, a fixing rod <NUM> and a mounting casing <NUM>.

Optionally, the mounting base <NUM> may be disposed on the adjustment mechanism <NUM>. The mounting base <NUM> can rotate about an adjustment rotation axis L relative to the stand assembly <NUM> under adjustment of the adjustment mechanism <NUM>, to adjust the mounting base <NUM> and the horizontal angle of the support assembly <NUM>. Preferably, the adjustment mechanism <NUM> is disposed above the mounting base, so as to facilitate removal and mounting of the beam from above while implementing adjustment of the horizontal angle. The adjustment rotation axis L is disposed in parallel to the fixed vertical rod <NUM> and the movable vertical rod <NUM>. That is to say, when the calibration bracket <NUM> is placed on a horizontal plane, the adjustment rotation axis L is vertically disposed. The mounting base <NUM> is provided with a notch <NUM> for facilitating placement of the connecting portion <NUM> in the mounting base <NUM> or removal of the connecting portion <NUM> from the mounting base <NUM>.

The holder <NUM> is substantially hook-shaped to facilitate holding of the connecting portion <NUM>. One end of the holder <NUM> is fixedly connected to the mounting casing <NUM>. For example, the end is mounted on an upper surface or a lateral surface of the mounting casing <NUM>. Another end of the holder surrounds and grasps the connecting portion <NUM> of a support assembly <NUM>, leaving the notch <NUM>. For example, the holder <NUM> may have the shape shown in <FIG>, or may have other shapes, such as a circular hook shape, a hook shape of other polygons, a hook shape with a combination of a circular ring and a polygon, so long as the connecting portion <NUM> can be stably held. The expression "substantially hook-shaped" herein means that the holder <NUM> can extend by a specific length at a specific angle, thereby supporting and holding the connecting portion <NUM>.

The holder <NUM> and the mounting casing <NUM> form a mounting channel through enclosure for accommodating the connecting portion <NUM>. The mounting channel is in communication with the notch <NUM>. Two positioning columns <NUM> are provided on an inner surface of the holder <NUM>. The two positioning columns <NUM> are located in the mounting channel and are to be inserted into the two positioning holes <NUM> (see <FIG>), to facilitate positioning of the connecting portion <NUM> in the mounting channel. The function of the positioning hole is to further reduce any displacement of the support assembly <NUM> relative to the mounting seat <NUM> in the horizontal direction during calibration. The positioning column <NUM> may also be disposed on the upper surface of the mounting casing <NUM> or on both the upper surface of the mounting casing <NUM> and the inner surface of the holder <NUM>. The expression "positioning column" herein includes circular, square, and elongated positioning columns, and the expression "positioning hole" includes circular, square, and elongated positioning holes. When the positioning column and the positioning holes are substantially point-shaped, there are preferably at least two positioning columns <NUM> in the length direction of the connecting portion <NUM>, to ensure that the connecting portion <NUM> does not move in the length direction thereof. When the positioning column and the positioning hole are substantially elongated, only one pair of positioning column and positioning hole may be used. It may be understood that, in some other embodiments, positions of the positioning hole <NUM> and the positioning column <NUM> may be transposed. That is to say, the positioning hole <NUM> is provided on the holder <NUM> in communication with the mounting channel. The positioning column <NUM> is disposed on the first surface <NUM> (see <FIG>).

Optionally, the fixing rod <NUM> is disposed on the holder <NUM>. The fixing rod includes a knob and at least one screw rod and is in screw-thread fit with the holder <NUM>. When the connecting portion <NUM> is sleeved on the mounting base <NUM>, a central axis of the fixing rod <NUM> is perpendicular to the fixing surface <NUM> at the beam connecting portion <NUM>. By rotating the fixing rod <NUM>, the fixing rod <NUM> can abut against the fixing surface <NUM>. The connecting portion <NUM> of the support assembly <NUM> can be fixed to the mounting base <NUM>. Alternatively, by rotating the fixing rod <NUM>, the fixing rod <NUM> can be detached from the fixing surface <NUM>. The connecting portion <NUM> can be removed from the mounting base <NUM> through the notch <NUM>.

Optionally, a specific angle is formed between the fixing surface <NUM> and the bottom surface (that is, a horizontal plane) of the mounting base <NUM> and between the fixing rod <NUM> and the bottom surface of the mounting base <NUM>. The angle is greater than <NUM> degrees and less than <NUM> degrees. Optionally, the angle is substantially <NUM> degrees. In this arrangement, only one fixing rod <NUM> needs to be used to apply, to the connecting portion <NUM>, a pressing force toward the bottom surface and a lateral surface of the mounting base. The lateral surface is a side opposite to a direction in which the fixing rod <NUM> extends. The fixed base fixes the connecting portion <NUM> with high stability. The support assembly can be easily disassembled and assembled.

It may be understood that the mounting base <NUM> may have other structures. For example, a notch may not necessarily be maintained. After the connecting portion <NUM> is placed in the mounting base <NUM>, a baffle or the like can be used to block the notch. The connecting portion <NUM> can also be mounted in other ways. For example, the mounting base <NUM> may be a complete ring structure without a notch for placing the beam. In this case, the beam may be assembled first, then the mounting base <NUM> can be inserted. Then the fixing rod <NUM> is used to tighten and fix the beam.

It may be understood that the bottom surface or side surface of the mounting seat <NUM> pressed by the connecting portion <NUM> may be arc-shaped or other irregular shapes. In this case, the fixing rod <NUM> may also be used to press the connecting portion <NUM> on these surfaces. There may be line contact between the fixing rod and these surfaces instead of surface contact, which will not affect the compression effect.

Optionally, when the mounting base <NUM> includes a notch <NUM>, the surface of the mounting base <NUM> facing away from the notch <NUM> may also be used to mount a calibration element, for example, a multi-line laser <NUM> (see <FIG>).

The mounting casing <NUM> is substantially a cube with an opening on one side. The adjustment mechanism <NUM> is disposed in the opening of the mounting casing <NUM>. The mounting housing <NUM> is provided with a threaded hole <NUM>. The adjustment mechanism <NUM> includes a supporting shaft <NUM>, a first elastic member <NUM>, a rotating member <NUM>, a bearing base <NUM>, a pedestal <NUM> and an adjusting rod <NUM>. The adjustment mechanism <NUM> is configured to adjust an angle (that is, a yaw angle) of the support assembly <NUM> in a horizontal direction.

The supporting shaft <NUM> is received in the mounting casing <NUM> and fixedly mounted to the inner wall of the mounting casing <NUM>. A central axis of the supporting shaft <NUM> overlaps with the adjustment rotation axis L.

One end of the first elastic member <NUM> is fixed to the mounting column <NUM>. Another end of the first elastic member <NUM> is fixed to the rotating member <NUM>. In this embodiment, the first elastic member <NUM> is a spring.

The rotating member <NUM> is substantially a cube. One end of the rotating member is provided with a protrusion <NUM>. The protrusion <NUM> and the first elastic member <NUM> are respectively located on two opposite sides of the rotating member <NUM>. The rotating member <NUM> is sleeved on the bearing base <NUM>.

The bearing base <NUM> is fixedly mounted on a surface of the pedestal <NUM>, and a central axis of the bearing base <NUM> overlaps with the adjustment rotation axis L. The rotating member <NUM> is fixedly mounted to the pedestal <NUM> and sleeved on the bearing base <NUM>. One end of the supporting shaft <NUM> is inserted into the bearing base <NUM>. The supporting shaft <NUM> and the mounting casing <NUM> can rotate together about the adjustment rotation axis L relative to the rotating member <NUM>, the bearing base <NUM> and the pedestal <NUM>.

The pedestal <NUM> is mounted to the movable vertical rod <NUM>. The movable vertical rod <NUM> can drive the pedestal <NUM> to rise or fall. In this embodiment, the pedestal <NUM> is a cube. The pedestal <NUM> covers the opening of the mounting casing <NUM>. The supporting shaft <NUM>, the first elastic member <NUM> and the rotating member <NUM> are all received in a cavity formed by the mounting casing <NUM> and the pedestal <NUM>.

The expression "cube" in this specification includes a thin plate shape.

The adjusting rod <NUM> is mounted in the threaded hole <NUM>. By rotating the adjusting rod <NUM>, the adjusting rod <NUM> abuts against the protrusion <NUM>, and pushes the mounting base <NUM> to rotate about the adjustment rotation axis L relative to the rotating member <NUM> and the pedestal <NUM>. Therefore, the mounting base <NUM> and the horizontal angle of the connecting portion <NUM> are adjusted. The first elastic member <NUM> is stretched. The adjusting rod <NUM> is rotated in an opposite direction. The mounting base <NUM>, rotates, through pulling of the first elastic member <NUM>, about the adjustment rotation axis L relative to the rotating member <NUM> and the pedestal <NUM> to return to its original position.

It may be understood that, in some other embodiments, the pedestal <NUM> may be omitted. The rotating member <NUM> and the bearing base <NUM> may be fixedly mounted on the top surface of the movable vertical rod <NUM> directly.

It may be understood that the foregoing adjustment mechanism <NUM> may be selectively used. When the adjustment mechanism <NUM> is cancelled, the mounting casing <NUM> of the mounting base <NUM> may be cancelled. The holder <NUM> is mounted on the top surface of the movable vertical rod <NUM> or other additional mounting surfaces. It should be understood that the holder <NUM> may also extend to form a bottom surface and surround the lower surface of the connecting portion <NUM> of the support assembly <NUM>. That is to say, the holder <NUM> may have a bottom surface mounted to the mounting casing <NUM>.

Referring to <FIG> again, there are two joint mechanisms <NUM>. One of the joint mechanisms <NUM> is connected between the first beam portion <NUM> and the connecting portion <NUM>. The other of the joint mechanisms <NUM> is connected between the second beam portion <NUM> and the connecting portion <NUM>. In some embodiments, the joint mechanism <NUM> is fixed in the wall tubes of the first beam portion <NUM>, the second beam portion <NUM> and the connecting portion <NUM>. In some embodiments, the joint mechanism <NUM> is fixed outside the wall tubes of the first beam portion <NUM>, the second beam portion <NUM> and the connecting portion <NUM>. The joint mechanism is connected to cross-sections of the wall tubes of the first beam portion <NUM>, the second beam portion <NUM> and the connecting portion <NUM> by snapping, screwing, bonding, and the like.

<FIG> and <FIG> together show a first implementation of a structure of a joint mechanism <NUM>. The joint mechanism <NUM> includes a first fixing member <NUM>, a second fixing member <NUM>, a first rotating shaft <NUM>, a fastening member <NUM>, a second rotating shaft <NUM>, a second elastic member <NUM> and a screwing mechanism <NUM>.

The first fixing member <NUM> and the second fixing member <NUM> are hinged to each other through the first rotating shaft <NUM>. The first fixing member <NUM> is substantially a cube. One end of the first fixing member is hinged to one end of the second fixing member <NUM>. The first fixing member <NUM> is provided with a first through hole <NUM>.

The fastener <NUM> is received in the first through hole <NUM>. The second rotating shaft <NUM> passes through the middle of the fastener <NUM>. Two ends of the second rotating shaft <NUM> are respectively mounted to side walls of the first fixing member <NUM>. The fastener <NUM> can rotate about the second rotating shaft <NUM>. A hook portion <NUM> extends from one end of the fastener <NUM>. One end of the second elastic member <NUM> abuts against another end of the fastener <NUM>. Another end of the second elastic member <NUM> abuts against an inner wall of the first fixing member <NUM>. The second elastic member <NUM> is a compression spring for restoration from elastic deformation, so as to push the fastener <NUM> to rotate about the second rotating shaft <NUM>.

The screwing mechanism <NUM> includes a knob and at least one section of screw rod. One end of the screwing mechanism <NUM> passes through the first fixing member <NUM> from the outside of the first fixing member <NUM>, and abuts against the fastening member <NUM>. The screwing mechanism <NUM> and the second elastic member <NUM> are located on the same side of the central axis of the second rotating shaft <NUM>. The hook portion <NUM> is located on the other side of the central axis of the second rotating shaft <NUM>.

The second fixing member <NUM> is also substantially a cube and provided with a second through hole <NUM>. An inner wall of the second through hole <NUM> is provided with a bulge <NUM>. The first fixing member <NUM> is fixed to the inside of the connecting portion <NUM>. The second fixing member <NUM> is fixed to the inside of the first beam portion <NUM> or the second beam portion <NUM>. The first beam portion <NUM> or the second beam portion <NUM> can be engaged with the connecting portion <NUM>.

When the first fixing member <NUM> and the second fixing member <NUM> are fastened, the first fixing member <NUM> is in contact with the second fixing member <NUM>, and the first through hole <NUM> is in communication with the second through hole <NUM>. Pushed by the second elastic member <NUM>, the hook portion <NUM> is fastened to the locking protrusion <NUM>, and the screwing mechanism <NUM> is rotated. The screwing mechanism <NUM> presses the fastening member <NUM>. The hook portion <NUM> is further fastened to the locking protrusion <NUM>. The first beam portion <NUM> or the second beam portion <NUM> is stably unfolded relative to the connecting portion <NUM>.

The screwing mechanism <NUM> is rotated to be disengaged from the fastening member <NUM>. The first fixing member <NUM> rotates relative to the second fixing member <NUM>. The hook portion <NUM> is separated from the locking protrusion <NUM>. The first fixing member <NUM> is separated from the second fixing member <NUM>. The first beam portion <NUM> or the second beam portion <NUM> can rotate relative to the connecting portion <NUM>. The support assembly <NUM> is folded.

In this embodiment, pushed by the second elastic member <NUM>, the hook portion <NUM> can be easily fastened to the locking protrusion <NUM>. The hook portion <NUM> and the locking protrusion <NUM> are fastened to each other in advance. Then the screwing mechanism <NUM> presses the fastening member <NUM>. The hook portion <NUM> is further fastened to the locking protrusion <NUM>.

It may be understood that, in some other embodiments, positions of the first fixing member <NUM> and the second fixing member <NUM> can be interchanged. That is to say, the first fixing member <NUM> is fixed to the inside of the first beam portion <NUM> or the second beam portion <NUM>. The second fixing member <NUM> is fixed to inside of the connecting portion <NUM>.

It may be understood that the first fixing member <NUM> and the second fixing member <NUM> may also be integrally formed with inner walls of the first beam portion <NUM>, the second beam portion <NUM> or the connecting portion <NUM>. That is to say, the first fixing member <NUM> and the second fixing member <NUM> may be a part of the inner walls of the first beam portion <NUM>, the second beam portion <NUM> or the connecting portion <NUM>. The first fixing member <NUM> and the second fixing member <NUM> may not be connected by using a first rotating shaft or are not connected. However, the first beam portion <NUM> or the second beam portion <NUM> and the outer wall of the connecting portion <NUM> are connected by using an additional rotating shaft. Therefore, the pivotable connection between the first beam portion <NUM> or the second beam portion <NUM> and the connecting portion <NUM> can also be implemented.

It may be understood that relative positions between the second elastic member <NUM> and the screwing mechanism <NUM> and the second rotating shaft <NUM> may be changed. That is to say, the second elastic member <NUM> may be closer to the second rotating shaft <NUM> than the screwing mechanism <NUM>, as long as the fastening member <NUM> can be fastened to the locking protrusion <NUM>.

Referring to <FIG> together, a second embodiment of a structure of a joint mechanism <NUM> is shown. The joint mechanism 39a provided in the second implementation is substantially the same as the joint mechanism <NUM> in the foregoing embodiment. A difference is that one end of the fastener 392a is provided with a hook portion 3922a and a bump 3924a. Two hook portions 3922a are located on two opposite sides of the bump 3924a. An inner wall of the second through hole <NUM> is provided with a bulge 3962a. There are two bulges 3962a. A position of each of the bulges 3962a corresponds to a position of a corresponding one of the hook portions 3922a. The knob <NUM> is replaced with a button 395a. The button 395a is mounted to the second fixing member <NUM>. The second elastic member <NUM> is a compression spring compressed between the first fixing member <NUM> and the fastener 392a.

When the first fixing member <NUM> and the second fixing member <NUM> are closed, the first fixing member <NUM> is in contact with the second fixing member <NUM>, and the first through hole <NUM> is in communication with the second through hole <NUM>. The second elastic member <NUM> abuts against the fastener 392a. The two hook portions 3922a are respectively fastened to the two bulges 3962a. The first fixing member <NUM> and the second fixing member <NUM> are fastened to each other. The first beam portion <NUM> or the second beam portion <NUM> is unfolded relative to the connecting portion <NUM>.

When the button 395a is pressed, and the button 395a pushes the bump 3924a to push the fastening member 392a to rotate around the second rotating shaft <NUM>, the hook portion 3922a is separated from the locking protrusion 3962a, and the second elastic member <NUM> is further compressed. In this case, the first fixing member <NUM> can rotate relative to the second fixing member <NUM>. The first fixing member <NUM> is separated from the second fixing member <NUM>. The first beam portion <NUM> or the second beam portion <NUM> can rotate relative to the connecting portion <NUM>, to fold the support assembly <NUM>. The button 395a is loosened to make the button 395a far away from the fastening member 392a. The second elastic member <NUM> recovers elastic deformation to push the fastening member 392a to rotate around the second rotating shaft <NUM>. The hook portion 3922a is fastened to the locking protrusion 3962a.

Referring to <FIG>, in order to increase the engagement strength of the first beam portion <NUM> and the second beam portion <NUM> with the connecting portion <NUM> respectively, so that the first beam portion <NUM> and the second beam portion <NUM> can be mounted with a calibration element with a more weight, the calibration bracket <NUM> may further include a fastening structure <NUM>. One fastening structure <NUM> is connected between the first beam portion <NUM> and the connecting portion <NUM>. The other fastening structure <NUM> is connected between the second beam portion <NUM> and the connecting portion <NUM>.

Each of the buckle structures <NUM> includes a first buckle <NUM> and a second buckle <NUM>. The connecting portion <NUM> is provided with a first fastener <NUM>. One end of the first fastener <NUM> is hinged to the connecting portion <NUM>. One end of the first fastener <NUM> hinged to the connecting portion <NUM> is provided with a pulling portion <NUM>. The other end of the first fastener <NUM> is provided with a hook rod <NUM>. The first beam portion <NUM> or the second beam portion <NUM> is provided with a second fastener <NUM>. The second fastener <NUM> is provided with a fastening portion <NUM>. A hinge joint of the first beam portion <NUM> or the second beam portion <NUM> and the connecting portion <NUM> is located on one side of the connecting portion <NUM>. The first fastener <NUM> and the second fastener <NUM> are located on the other side of the connecting portion <NUM>. When the first beam portion <NUM> and the second beam portion <NUM> are unfolded relative to the connecting portion <NUM>, the first beam portion <NUM> and the second beam portion <NUM> are respectively in contact with the connecting portion <NUM>. The hook rod <NUM> is fastened to the fastening portion <NUM>. By pulling the pulling portion <NUM>, the hook rod <NUM> is separated from the fastening portion <NUM>. The first fastener <NUM> and the second fastener <NUM> may be separated. The first beam portion <NUM> or the second beam portion <NUM> can be folded relative to the connecting portion <NUM>.

It may be understood that, in some other embodiments, positions of the first fastener <NUM> and the second fastener <NUM> can be interchanged. That is to say, the first fastener <NUM> is disposed on the first beam portion <NUM> or the second beam portion <NUM>. The second fastener <NUM> is disposed on the connecting portion <NUM>. In some embodiments, the first fastener <NUM> and the second fastener <NUM> can be used in conjunction with the joint mechanism <NUM>. That is to say, in this case, the joint mechanism <NUM> is disposed in inner walls of the first beam portion <NUM>, the second beam portion <NUM> and the connecting portion <NUM>. In some embodiments, the first fastener <NUM> and the second fastener <NUM> can be used alone. That is, in this case, the joint mechanism <NUM> is not disposed in inner walls of the first beam portion <NUM>, the second beam portion <NUM> and the connecting portion <NUM>.

Referring to <FIG> and <FIG> together, another embodiment of the disclosure also provides a calibration system <NUM>. The calibration system includes a calibration element and the calibration bracket <NUM> provided in the foregoing embodiments. The calibration element can be mounted to the calibration bracket <NUM>. For example, the calibration element is a reflector <NUM> and a distance measurement apparatus <NUM> (see <FIG>). The reflector <NUM> may be mounted on a first guide rail <NUM> or a second guide rail <NUM> via a slider. The slider is mounted to the first guide rail <NUM> or the second guide rail <NUM>, and can slide along the first guide rail <NUM> or the second guide rail <NUM> together with the reflector <NUM>. The distance measurement apparatus <NUM> is fixedly mounted to the support assembly <NUM>. The reflector <NUM> may also be a target <NUM>. Two targets are mounted on the first guide rail <NUM> and the second guide rail <NUM> through the slider. The reflector or the target <NUM> may be further directly mounted to the support assembly <NUM> by using a hook, or the like. In this case, the first guide rail <NUM> and the second guide rail <NUM> may be cancelled.

The foregoing distance measurement apparatus <NUM> is configured to measure a height of the support assembly <NUM> from the ground. The height is preferably displayed on a liquid crystal display screen of the distance measurement apparatus <NUM>. In an embodiment, the distance measurement apparatus <NUM> is a laser rangefinder. A through hole <NUM> is disposed on the base <NUM>. A laser of the laser rangefinder <NUM> aims at the ground to measure the height of the support assembly <NUM> from the ground.

For another example, the calibration element is a pattern plate <NUM> (see <FIG>). The first supporting member <NUM> and the second supporting member <NUM> jointly support the pattern plate <NUM> to prevent falling. In addition, a first fixing block <NUM> may be further mounted to the first guide rail <NUM>. The first fixing block <NUM> can slide in the first guide rail <NUM>. A second fixing block <NUM> is mounted to the second guide rail <NUM>. The second fixing block <NUM> can slide in the second guide rail <NUM>. The first fixing block <NUM> and the second fixing block <NUM> are respectively located on two opposite sides of the pattern plate <NUM>. The first fixing block <NUM> and the second fixing block <NUM> collaboratively clamp the pattern plate <NUM>.

In an optional embodiment, the first fixing block <NUM> and the second fixing block <NUM> are sliders for mounting the reflector <NUM>. A slot for clamping the pattern plate <NUM> is provided on opposite sides of the slider, to form a fixing block. It may be understood that the first fixing block <NUM> and the second fixing block <NUM> may also be magnetic blocks. The magnetic blocks attract the pattern plate <NUM> from the back through magnetic absorption, to cause the pattern plate <NUM> to be more firmly mounted to the support assembly <NUM>.

Claim 1:
A calibration bracket (<NUM>), comprising a base (<NUM>), a stand assembly (<NUM>) and a support assembly (<NUM>), the support assembly (<NUM>) being configured to mount a calibration element; and
the stand assembly (<NUM>) being characterised by:
a fixed vertical rod (<NUM>), one end of the fixed vertical rod (<NUM>) being mounted to the base (<NUM>);
a movable vertical rod (<NUM>), mounted to another end of the fixed vertical rod (<NUM>), the movable vertical rod (<NUM>) being movable relative to the fixed vertical rod (<NUM>) only along a central axis, and the support assembly (<NUM>) being mounted to the movable vertical rod (<NUM>);
a driving mechanism (<NUM>), comprising a first threaded rotating member (<NUM>), a second threaded rotating member (<NUM>) and a threaded fixed member (<NUM>), the first threaded rotating member (<NUM>) being mounted to the fixed vertical rod (<NUM>) and
being rotatable relative to the fixed vertical rod (<NUM>) about the central axis, the second threaded rotating member (<NUM>) having a first threaded structure and a second threaded structure spiraling about the central axis, a spiraling direction of the first threaded structure being the same as a spiraling direction of the second threaded structure, the second threaded rotating member (<NUM>) being mounted to the first threaded rotating member (<NUM>) through the first threaded structure and being mounted to the threaded fixed member (<NUM>) through the second threaded structure, and the threaded fixed member (<NUM>) being fixedly mounted to the movable vertical rod (<NUM>),
wherein the fixed vertical rod (<NUM>) has a mounting separator plate (<NUM>);
the first threaded rotating member (<NUM>) comprises a journal portion (<NUM>), the journal portion (<NUM>) being disposed at an end of the first screw portion (<NUM>); and
the journal portion (<NUM>) is inserted in the mounting separator plate (<NUM>), and the cross-sectional dimension of the first screw portion (<NUM>) is greater than a cross-sectional dimension of the journal portion (<NUM>), so that the first threaded rotating member (<NUM>) is rotatable relative to the fixed vertical rod (<NUM>) only about the central axis.