Patent Publication Number: US-2022236373-A1

Title: Calibration device for vehicle advanced driver assistant system

Description:
TECHNICAL FIELD 
     The present disclosure relates to the technical field of vehicle maintenance and calibration device, and more particularly to a calibration device for a vehicle ADAS (Advanced Driver Assistant System). 
     BACKGROUND 
     Advanced Driver Assistant System, abbreviated as ADAS, uses a variety of sensors installed on a vehicle to collect environmental data inside and outside the vehicle at the first time to perform technical processing such as identification, detection and tracking of dynamic and static objects, so that a driver can be aware of possible dangers in a fastest time, in order to attract attention and improve safety and active safety technology. 
     At present, the sensors used in ADAS mainly include cameras, radars, lasers and ultrasonics, etc., which can detect light, heat, pressure or other variables used to detect the state of the vehicle, and are usually located inside of a front and rear bumpers, side mirrors and steering column, or on the windshield. During the use of the vehicle, vibration, collision, environmental temperature and humidity, etc. would change the physical installation status of the above-mentioned sensors, and therefore need to be adjusted or calibrated irregularly. 
     Since the irregular adjustment or calibration of the vehicle ADAS may be carried out indoors (performed in maintenance shop) or outdoors. However, the existing ADAS calibration devices occupy a large space and are inconvenient to carry due to their own structure. As a result, the related calibration operations of the ADAS calibration device cannot be performed outdoors or the operation is difficult, which waste time and energy. 
     Therefore, how to design a portable ADAS calibration device has become an urgent problem to be solved. 
     SUMMARY 
     One of objects of embodiments of the present disclosure is to provide a calibration device for a vehicle ADAS, in order to solve the technical problem that the calibration device occupy a large space. 
     In order to solve above-mentioned technical problem, an embodiment of the present disclosure adopts the technical scheme is: 
     providing a calibration device for a vehicle Advanced Driver Assistant System, comprising: 
     a foldable base, comprising a bearing seat and a plurality of bearing arms rotatably arranged on the bearing seat; 
     a stand assembly, disposed on the bearing seat, wherein the bearing arms are able to be folded relative to the bearing seat in a direction approaching the stand assembly; and 
     a beam assembly, disposed on a top of the stand assembly and comprising two foldable beams. 
     The beneficial effect of the calibration device for the vehicle ADAS provided by the embodiment of the present disclosure is that the bearing arms of the foldable base can be turned over relative to the bearing seat and stays in the current position stably, the beams can also be turned from a horizontal direction to a vertical direction, and the bearing arms can be turned over relative to the beam, such that the calibration device for the vehicle ADAS can be folded when it is not in use, so that it occupies a small space and is convenient to carry, thereby facilitating its storage and transportation. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to explain the embodiments of the present disclosure more clearly, a brief introduction regarding the accompanying drawings that need to be used for describing the embodiments of the present disclosure or the prior art is given below; it is obvious that the accompanying drawings described as follows are only some embodiments of the present disclosure, for those skilled in the art, other drawings can also be obtained according to the current drawings on the premise of paying no creative labor. 
         FIG. 1  is a schematic view of an overall structure of a calibration device for a vehicle ADAS provided with a small target plate installed in an embodiment of the present disclosure; 
         FIG. 2  is a schematic view of an overall structure of a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure after being folded and stored; 
         FIG. 3  is a schematic view of a folded foldable base in a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 4  is a schematic view of a partial cross-sectional structure of a foldable base in a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 5  is a schematic view of a partial exploded structure of a foldable base in a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 6  is a schematic view of an exploded structure of the traveling wheel and a height adjustment member in a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 7  is a schematic view of an exploded structure of a stand assembly of a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 8  is a schematic view of a cross-sectional structure of a stand assembly of a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 9  is a schematic view of a partial enlarged structure of a stand assembly of a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 10  is a schematic view of an exploded structure of a drive member of a stand assembly of a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 11  is a schematic view of an assembly structure of a turbine, a worm, a first transmission wheel, a second transmission wheel and a driving wheel in a drive member of a stand assembly in a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 12  is a schematic view of an overall structure of a calibration device for a vehicle ADAS provided with a large target plate installed in an embodiment of the present disclosure; 
         FIG. 13  is a schematic view of an assembly structure of a mounting seat and to supporting rod of a beam assembly in a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 14  is an enlarged view of A in  FIG. 13 ; 
         FIG. 15  is a schematic view of a position structure of beams and fixing blocks of a beam assembly in a calibration device for a vehicle ADAS provided by the embodiment of the present disclosure; 
         FIG. 16  is an enlarged view of B in  FIG. 15 ; 
         FIG. 17  is a schematic view of an overall structure of fixing blocks of a beam assembly in a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 18  is a schematic structural view of a first connection member of a beam assembly in a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 19  is a schematic structural view in which a rotatable plate in a calibration device for a vehicle ADAS provided by an embodiment of the application is turned 180° relative to a mounting seat; 
         FIG. 20  is a schematic view of the exploded structure of the laser, the rotating plate and the mounting seat in a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; 
         FIG. 21  is a schematic view of the structure of a rear plate and a rotatable plate in a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure; and 
         FIG. 22  is a schematic view of a planar structure of a rear plate in a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     In order to make the purpose, the technical solution and the advantages of the present disclosure be clearer and more understandable, the present disclosure will be further described in detail below with reference to accompanying figures and embodiments. It should be understood that the specific embodiments described herein are merely intended to illustrate but not to limit the present disclosure. 
     In order to illustrate the technical solutions provided by the present disclosure, detailed descriptions are given below in conjunction with specific drawings and embodiments. 
     Embodiment 1 
     As shown in  FIGS. 1 to 3 , a calibration device for a vehicle ADAS provided by an embodiment of the present disclosure will now be described. The calibration device includes foldable base  1 , a stand assembly  2 , a beam assembly  3 , a laser  4  and target plates  5 . 
     Among them, the foldable base  1  is configured to bear and realize the movement and location of the calibration device. The foldable base  1  includes a bearing seat  11  and a plurality of bearing arms  12  rotatably disposed onto the bearing seat  11 ; the stand assembly  2  is installed on the foldable base  1  and configured to support the beam assembly  3  so as to realize the height adjustment of the beam assembly  3 . In a preferred situation, the bearing arms  12  are folded toward the stand assembly  2  relative to the bearing seat  11 ; the beam assembly  3  is configured to mount the target plates  5  and laser  4 . The beam assembly  3  is arranged onto the top of the stand assembly  2 . The beam assembly  3  includes two foldable beams  32 . The beam  32  is also folded in a direction adjacent to the stand assembly  2 . The beams  32  and the bearing arms  12  are folded relative to a folding direction which taking the middle of the stand assembly  2  as reference point. The laser  4  is disposed on the beam assembly  3  and is located on the symmetry line of the two beams  32 . The laser  4  is configured to locate the position of the calibration device. As shown in  FIG. 1  and  FIG. 2 , in the present embodiment, when in a work situation, the foldable base  1  is folded; when out of work, the foldable base  1  is unfolded to reduce the space occupied by the foldable base  1  during storing. The beam assembly  3  is also be folded to reduce the beam assembly  3  occupying the space when storing, so as to facilitate the calibration device to be carried. 
     Embodiment 2 
     In the present embodiment, based on the above-mentioned embodiment 1, the specific structure of the foldable base  1  is described in detail as shown in  FIGS. 1 to 6 . 
     Specifically, the foldable base  1  includes a bearing seat  11  and a plurality of bearing arms  12  rotatably arranged on the bearing seat  11 . There are three bearing arms  12  which are arranged at intervals of equal angles with the bearing seat  11  as the center. An end of each of the bearing arms  12  away from the bearing seat  11  is provided with a traveling wheel  6  a height adjusting member  7 . The traveling wheels  6  are configured to realize the movement of the calibration device for the vehicle ADAS during the positioning process, making it convenient to be adjusted. The height adjusting member  7  is configured to adjust the height of the foldable base  1  from the ground and the level of the foldable base  1 , so that the foldable base  1  is suitable for uneven ground and the ground having obstacles. In other embodiments, the bearing arms  12  are detachably installed on the bearing seat  11 . When the foldable base is stored, the bearing arms  12  can be detached from the bearing seat  11 , and then attached to the bearing seat  11  for placement. 
     Specifically, the stand assembly  2  is arranged at the center of the bearing seat  11  and extend vertically, which make the center of gravity of the calibration device for the vehicle ADAS being on the bearing seat  11 . The stability and levelness of foldable base  1  in an unfold situation can be ensured by the three bearing arms  12  because of the stability theorem of the triangle formed, it can ensure. 
     Specifically, as shown in  FIGS. 1 and 3 , the bearing arms  12  can be folded relative to the bearing seat  11  in a direction adjacent to the stand assembly  2 . Specifically, the extension direction of the bearing arm  12  can be reversed from the horizontal direction to the vertical direction, and a locking assembly  13  that limits the folding angle of the bearing arm  12  is provided at the rotational connection of each of the bearing arms  12  and the bearing seat  11 . The locking assembly  13  is configured to ensure the firmness of the bearing arm  12  in the unfolded and folded storage state. The bearing arms  12  are in an unfold situation when The bearing arms  12  extend horizontally, as the traveling wheels  6  are in touch with the ground to make the foldable base  1  bearing the load; while the bearing arms  12  are in a fold situation when The bearing arms  12  extend vertically, with a small storage space for the foldable base  1 , which is convenient for storage and transportation and makes it easy to carry. In order to explain in more detail, the horizontal direction refers to the left-right direction in the figures, and the vertical direction refers to the up-down direction in the figures. 
     As shown in  FIGS. 3 to 5 , the bearing seat  11  includes a bearing plate  111  and baffles  112  surrounding the bearing plate  111 . The baffles  112  are provided with three and are distributed in a triangle shape. The baffles  112  are curved plates and there is a gap between same ends of each two adjacent baffles  112 , and one end of each bearing arms  12  is arranged in the gap between the two baffles  112  through a first rotating shaft  113 . 
     As shown in  FIGS. 3 to 5 , the locking assembly  13  includes a first locking hole  131  and a second locking hole  132  arranging on the baffle  112 , and a locking member  133  arranging on the bearing arm  12 . When the locking member  133  is in the first locking hole, the bearing arm extends in the horizontal direction, and the bearing arm  12  is in the unfolded state; when the locking member  133  is in the second locking hole  132 , the bearing arm  12  extends in the vertical direction, and the bearing arm  12  is in the folded state. 
     Specifically, as shown in  FIGS. 3 to 5 , the first locking hole  131  is a first groove formed on the baffle  112 , the second locking hole  132  is a second groove formed on the baffle  112 , and a first opening of the first groove faces the horizontal direction, and a first opening of the second groove faces the vertical direction, and the locking member  133  is a locking rod that is slidably arranged on the bearing arm  12  and can be respectively engaged with the first groove and the second groove. When the locking rod is engaged in the first groove, the bearing arm  12  extends horizontally, and when the locking rod is engaged in the second groove, the bearing arm  12  extends vertically. The locking rod is slidingly set on the bearing arm  12 , to make the locking rod can be separated from the first groove or the second groove, so that the bearing arm  12  can rotate. In other embodiments, the first locking hole  131  and the second locking hole  132  are formed by the first through hole and the second through hole spaced apart from the first rotating shaft  113 , and the connection line between the first through hole and the first rotating shaft  113  is a horizontal line, while the connecting line between the second through hole and the first rotating shaft  113  is a vertical line. The locking member  133  is a bolt that can pass through the first through hole or the second through hole respectively. The bolt is configured to cooperate with the first rotating shaft  113  to limit the bearing arm  12  from rolling-over. 
     As shown in  FIGS. 3 to 5 , the bearing arms  12  are hollow columns, each of which can be a hollow square column or a hollow cylinder. the bearing arm  12  is provided with a sliding slot  121 , which is disposed on the side wall of the bearing arm  12 , a second rotating shaft  134  is slidably disposed in the sliding slot  121 , and the second rotating shaft  134  is provided with a sliding handle  135 , which the locking rod is installed on. The sliding handle  135  is slidable along a longitudinal direction of the sliding slot  121  under the action of external force to drive the locking rod engaged into or out of the first groove and second groove. The sliding handle  135  is L-shaped, the bottom wall of the bearing arm  12  is provided with a first slot, a part of the sliding handle  135  is inserted into the bearing arm  12  through the first slot and arranged on the second rotating shaft  134 , wherein a part of the locking rod is arranged on the sliding handle  135  and extends out of the bearing arm  12  through the sliding slot  121 , so that the part of the locking rod that extends out of the bearing arm  12  is engaged in the first groove or the second groove. The function of the sliding handle  135  is to facilitate the operation of the equipment user to drive the locking rod to move. In a preferred embodiment, the first groove and the second groove are both semi-circular grooves. In this case, the locking rod is a cylindrical rod with a circular cross section. In other embodiments, the first groove and the second groove are both polygonal, such as triangle grooves, square grooves, etc., correspondingly, the cross-sectional shape of the locking rod is a triangular prism rod or a square rod that matches the first groove and the second groove. 
     As shown in  FIGS. 3 to 5 , the locking assembly  13  also includes an elastic reset member  136 . In a natural state, the elastic reset member  136  drives the locking rod to be engaged into the first groove or the second groove. The purpose of setting the elastic reset member  136  is to ensure the continuous engaging of the locking rod in the first groove or the second groove, and to ensure the stability of the engaging effect of the locking rod. 
     Specifically, as shown in  FIGS. 3 to 5 , the elastic reset member  136  is a tension spring, one end of the tension spring is sleeved on the first rotating shaft  113 , the other end of the tension spring is sleeved on the locking rod, and the tension spring is located inside the bearing arm  12 . The tension spring is in a stretched state in a natural state and pulls the locking rod to move in the direction of being locked into the first groove or the second groove. Of course, one end of the tension spring can also be connected to the baffle  112 , and the other end of the tension spring can be connected to the second rotating shaft  134  or sliding handle  135 . The number of tension springs can be set to two or more, as long as it can ensure that the locking rod does not detach from the first groove or the second groove without being subjected to external force, that is, during normal transportation or movement, the received vibration force will not cause the locking rod to detach from the first groove or the second groove. 
     In other embodiments, the elastic reset member  136  is a spring, one end of the spring is disposed on the bearing arm  12 , and the other end of the spring abuts on the locking rod. The spring is in a compressed state in a natural state and drives the locking rod to move in the direction of being locked into the first groove or the second groove. Alternatively, one end of the spring is fixed on the bearing arm  12 , and the other end abuts on the second rotating shaft  134 . Among them, the natural state means that after the locking rod is engaged in the first groove or the second groove, the tension spring is still in a stretched state, and the spring is still in a compressed state, so as to continuously provide tension or elasticity to ensure the stability of the locking rod being engaged to the first groove or the second groove. 
     As shown in  FIGS. 4 and 5 , the edge of the baffle  112  between the first groove and the second groove is an arc-shaped edge. The arc-shaped edge is convenient for the locking rod to slide from the first groove along the arc-shaped edge to the second groove for the user save energy. 
     Embodiment 3 
     In the present embodiment, on the basis of the foregoing embodiment 1 and embodiment 2, as shown in  FIGS. 1 to 6 , the specific structures of the traveling wheels  6  and the height adjusting member  7  are described in detail. 
     As shown in  FIGS. 4 to 6 , the height adjusting member  7  is a knob screw, which is screwed to the bearing arm  12 . One end of the knob screw is rotatably disposed on the traveling wheel  6 , and the other end is the operating end. The bearing arm  12  can be controlled to lift by rotating the knob screw, thereby adjusting the height between the bearing arm  12  and the ground, so that the foldable base  1  can overcome higher obstacles. 
     As shown in  FIGS. 4 to 6 , in the present embodiment, the traveling wheels  6  are brake-type universal wheels, which make the position of the foldable base  1  convenient and stable. Among them, the knob screw and the brake-type universal wheels are rotatably connected by a bearing  74 , and the rotation axis of the rotating screw is coincide with the brake-type universal wheel. 
     As shown in  FIGS. 4 to 6 , the traveling wheel  6  includes a mounting frame  61  and a rotating wheel  62 . Among them, the rotating wheel  62  is mounted on the mounting frame  61  to rotate through a sixth rotating shaft  63 . In a preferred embodiment, the rotating wheel  62  is a TPR (Thermo-Plastic-Rubber material, thermoplastic rubber) wheel, which can increase the friction between the wheel  62  and the ground to ensure the stability of the mobile positioning base at the current position. In other embodiments, the rotating wheel  62  can be a polyurethane wheel, a plastic wheel, a nylon wheel or a steel wheel. 
     As shown in  FIGS. 4 to 6 , the mounting frame  61  includes two parallel plates  611  arranged at intervals and a connecting plate  612  connecting the two parallel plates  611 . The mounting frame  61  has a U-shaped structure as a whole, and the rotating wheel  62  is rotatably arranged between two parallel plates  611  through the sixth rotating shaft  63 , such that the traveling wheels  6  have the advantages of easy production and installation. 
     As shown in  FIGS. 4 to 6 , the connecting plate  612  is provided with a through hole  613 , and the height adjusting member  7  includes a screw  71  and a knob handle  72 . The screw  71  and the bearing arm  12  are threadedly connected, and the knob handle  72  is arranged at the operating end of the screw  71 . The end of the screw  71  away from the knob handle  72  is provided with a first nut  73  with an outer diameter greater than the diameter of the through hole  613 , and the connecting plate  612  is provided with a bearing  74 , and the bearing  74  and the first nut  73  are respectively located on both sides of the connecting plate  612 , the end of the screw  71  away from the first nut  73  passes through the through hole  613  and the bearing  74  successively, and is threadedly connected to the bearing arm  12 , and then the knob handle  72  is installed, so that the first nut  73  and the bearing  74  are located on the two sides of the connecting plate  612 , the screw  71  passes through the through hole  613  and is rotatably connected to the mounting frame  61  through the bearing  74 . Among then, the first nut  73  is configured to prevent the screw  71  from separating from the mounting frame  61 , and the bearing  74  is configured to connect the screw  71  and the mounting frame  61  rotatably, so that the traveling wheel  6  can rotate freely around the axis of the height adjustment assembly. 
     Specifically, the bearing  74  is a ball bearing, and the ball bearing includes an inner ring and an outer ring that can rotate relative to each other. Among then, the outer ring of the bearing  74  is fixed on the connecting plate  612  through a limiting block  75 . The limiting block  75  is provided with limiting teeth on the side which close to the connecting plate  612 . The limiting teeth abut against the connecting plate  612 , and the limiting teeth are configured to limit the relative position change of the limiting block  75  and the connecting plate  612 , so that the outer ring of the bearing  74  and the connecting plate  612  are fixed together, which can help the inner ring of the bearing  74  rotate relative to the connecting plate  612 . 
     Specifically, a nut  76  is screwed on the screw  71 , and the nut  76  abuts on the inner ring of the bearing  74  so that both the screw  71  and the inner ring rotate synchronously with respect to the outer ring. The screw  71  realizes the synchronous rotation of the screw  71  and the inner ring through the friction between the nut  76  and the inner ring, and is configured to space the bearing arm  12  and the outer ring of the bearing  74  to ensure that the inner ring can rotate. The use of the nut  76  enables the installation between the screw  71  and the inner ring to have the advantages of adjustable position and convenient installation. 
     As shown in  FIGS. 4 to 6 , the traveling wheel  6  also includes a brake pad  64  rotatably arranged on the mounting frame  61  by a seventh rotating shaft  66  and a pedal  65  rotatably arranged on the mounting frame  61  rotated by an eighth rotating shaft  67 , the brake pad  64  and the pedal  65  are both arranged between two parallel plates  611 . The brake pad  64  is located above the top of the rotating wheel  62 . The pedal  65  drives the brake pad  64  and the rotating wheel  62  to abut or separate when subjected to external force. The pedal  65  is convenient for the user to apply force. The seventh rotating shaft  66  and the eighth rotating shaft  67  are both damped and arranged on two parallel plates  611 , so that the brake pads  64  and the pedal  65  are damped and connected to the mounting frame  61 , in this way, the stability of the brake pad  64  being parked at the current position is ensured, thereby ensuring that the brake pad  64  can restrict the rotating wheel  62  from rolling. 
     As shown in  FIGS. 1 and 4 , a gradienter  8  is provided on the beam assembly  3 . The gradienter  8  is configured to determine the level of the laser  4  on the beam assembly  3 , and the level adjustment of the gradienter  8  is realized by the height adjusting member  7 . 
     Embodiment 4 
     In the present embodiment, based on the embodiments 1-3, as shown in  FIGS. 1 to 11 , the specific structure of the stand assembly  2  is described in detail. 
     As shown in  FIGS. 7, 8 and 9 , the stand assembly  2  includes: a fixing seat  21 , an outer column  22 , an inner column  23 , a limiting ring  24 , a transmission member  25 , and a drive member  26 . 
     Among them, the fixing seat  21  is fixed at the center of the bearing seat  11  by screws, and one end of the outer column  22  is fixed on the fixing seat  21  by screws. The outer column  22  is firstly inserted into the fixing seat  21  and then is fixed together using screws from the side surface of the outer column  22 . 
     Among them, the outer column  22  is a hollow column, the inner portion of the outer column  22  has a channel with the same cross section as that of the inner column  23 , the inner column  23  is movably inserted into the outer column  22 , and there is a gap between the inner wall of the outer column  22  and the outer wall of the inner column  23 , and the gap is configured to reduce the contact area between the outer column  22  and the inner column  23 , thereby reducing the friction force when the inner column  23  is lifted relative to the outer column  22 , which is convenient and labor-saving. 
     The beam assembly  3  and the laser  4  are installed at the end of the inner column  23  away from the fixing seat  21 . Specifically, a mounting plate  234  for installing the beam assembly  3  and the laser  4  is fixed in the inner column  23 . The laser  4  and inner column  23  are located on the same axis, so as to ensure accurate positioning of the laser  4 . 
     Among them, the limiting ring  24  is arranged at the end of the outer column  22  away from the fixing seat  21 , the limiting ring  24  is provided with a first engagement portion  241 , the inner column  23  is provided with a second engagement portion  231 , and the first engagement portion  241  and the second engagement portion  231  are engaged, such that the second engagement portion  231  can only slide back and forth along the longitudinal direction of the outer column  22  relative to the first engagement portion  241 , so that the inner column  23  can move up and down relative to the outer column  22 ; the first engagement portion  241  and the second engagement portion  231  are configured for limiting the relative rotation of outer column  22  and inner column  23  to ensure the precise position of the laser  4  installed onto inner column  23 . The laser  4  is configured to position the center axis of the vehicle to determine the relative position between the target plate  5  on the beam assembly  3  and the vehicle. 
     Among them, the transmission member  25  is arranged on the inner column  23  and the transmission member  25  is flush with the outer surface of the inner column  23  or recessed on the outer surface of the inner column  23 , so as to ensure that the transmission member  25  will not abut with the inner wall of the outer column  22  to ensure that the friction between inner column  23  and outer column  22  will not be increased. The drive member  26  is disposed on the outer column  22  and connected to the transmission member  25 . The drive member  26  drives the inner column  23  to lift by driving the transmission member  25  to lift. The drive member  26  can be controlled manually, or the drive member  26  can be controlled electrically, such as by the motor plus gear, to drive the transmission member  25  to lift. Alternatively, the inner column  23  is provided with a screw, the bottom of the screw is provided with a screw motor, and the screw motor is installed on the bearing seat  11 , the inner column  23  is lifted by a lead screw disposed onto the screw. In order to be suitable for more environments such as no power supply environment, the drive member  26  of the present embodiment adopts a manual control method. 
     In the present disclosure, the outer column  22  is an outer cylinder, and the inner column  23  is an inner cylinder. In other embodiments, the outer column  22  and the inner column  23  are both regular polygons with the same cross-sectional shape, such as triangles, rectangles, rhombuses, squares, regular hexagons, etc. For example, the outer column  22  and inner column  23  are replaced by square columns, in this case, the limiting ring  24  can be omitted. That is, the stand assembly  2  includes a fixing seat  21 , an outer square column, an inner square column, a transmission member  25  and a drive member  26 . The inner square column is tightly inserted into the outer square column. The inner square column and the outer square column can prevent the inner square column from rotating. The cross-sections of the inner and outer square columns are not limited to squares, but can also be triangles, pentagons, hexagons, ellipses or arcs combined with straight lines and polygons, as long as the inner square column cannot rotate relative to the outer square column being guaranteed. 
     In the present embodiment, the inner column  23  is inserted in the outer column  22  and spaced from the outer column  22 , which reduces the contact area, thereby reducing the friction force, so that the lifting of the inner column  23  is labor-saved, and the outer column  22  and the inner column  23  pass through the first engagement portion  241  and the second engagement portion  231  are limited to prevent relative rotation between the outer column  22  and the inner column  23 , and ensure the position accuracy of the inner column  23 . The lifting of the inner column  23  is realized by the cooperation of the transmission member  25  and the drive member  26 , which only needs one person to operate, and making the lifting of inner column  23  has the advantages of simple operation, good stability, high precision and time saving. 
     As shown in  FIG. 7 ,  FIG. 8  and  FIG. 9 , since the outer column  22  and the inner column  23  are both cylinders, the limiting ring  24  is an annular ring structure, and the first engagement portion  241  is a protrusion radially protruding from the limiting ring  24  and the second engagement portion  231  is a groove provided on the inner column  23  and slidably engaged with the protrusion. The length direction of the groove is the same as that of the inner column  23 . In the present embodiment, the friction between the inner column  23  and the outer column  22  only comes from the friction between the protrusion and the side walls of the groove, and the contact area is relatively smaller, which can save effort. Two protrusions and two grooves are symmetrically arranged, and the transmission member  25  is arranged in the middle of the arcs of the two grooves. 
     As shown in  FIG. 7 ,  FIG. 8  and  FIG. 9 , one end of the outer column  22  away from the fixing seat is provided with a notch  221  for the protrusion inserting into the outer column  22 . The limiting ring  24  is fixed on the outer column  22  by fasteners such as screws. The notch  221  is communicated to an end surface of outer column  22 . The protrusion is engaged into the notch  221  during installation, so that the limiting ring  24  is attached to the outer column  22 , then using screws to fix the limiting ring  24  and outer column  22  to make the limiting ring  24  is easy to disassemble and assemble. 
     As shown in  FIG. 7 ,  FIG. 8  and  FIG. 9 , the inner column  23  is provided with a receiving groove  232 , and the transmission member  25  is fixed in the receiving groove  232  by a fastener such as a screw, so that the transmission member  25  is detachable and does not protrude an outer surface of inner column  23 . In a preferred embodiment, the transmission member  25  is a straight rack, and in other embodiments, the transmission member  25  is a helical rack. 
     As shown in  FIG. 7 ,  FIG. 8  and  FIG. 9 , one end surface of the inner column  23  inserted into the outer column  22  is provided with a plurality of limiting rods  233 , the plurality of limiting rods  233  are spaced apart in an equi-arc, and an end surface of each of the limiting rods  233  is in contact with the inner wall of the outer column  22 , the function of the limiting rod  233  is to ensure that the axis of the inner column  23  coincides with the axis of the outer column  22 , thereby ensuring the position accuracy of the laser  4  onto the inner column  23 . In the present embodiment, some of the limiting rods  233  abut against the corresponding protrusions to stop the inner column  23  from lifting when the limiting rods  233  are lifted to the limiting ring  24  along with the inner column  23 . At this time, the limiting rods  233  can also prevent inner column  23  from rising and detaching from outer column  22 , and ensure the stability of the insertion of the inner column  23  into the outer column  22 . In the present embodiment, the limiting rods  233  may be arranged in multiple turns along the axis of the inner column  23  at intervals. 
     As shown in  FIG. 7 ,  FIG. 8  and  FIG. 9 , the limiting rods  233  are screws, so that the height of the limiting rods  233  protruding from the outer surface of the inner column  23  can be adjusted so as to be suitable for the difference width of the gap between the inner column  23  and the outer column  22 . In addition, the surface of the limiting cap of the screw in contact with the inner wall of the outer column  22  is an arc-shaped surface, and its arc-shaped surface fits the arc of the inner wall of the outer column  22 , thus ensuring the fitting stability between the limiting rods  233  and the inner wall of the outer column  22 . The limiting cap can be the nut itself of the screw, or a hemispherical protrusion provided on the nut of the screw, that is, the arc-shaped surface can be obtained by setting the nut of the screw into a hemispherical shape or setting a hemispherical protrusion onto the nut of the screw. 
     As shown in  FIG. 8 ,  FIG. 10  and  FIG. 11 , the drive member  26  includes: a box body  261  fixed on the outer column  22 , a third rotating shaft  262  and a fourth rotating shaft  263  rotatably provided in the box body  261 , a turbine  264  and a first transmission wheel  265  disposed on the third rotating shaft  262 , a second transmission wheel  266  meshed with the first transmission wheel  265  and a driving wheel  267  meshed with the transmission member  25  that are disposed on the fourth rotating shaft  263 , a worm  268  rotatably disposed on the box body  261  and in self-locking meshed with a turbine  264 , and an operating handle  269  arranged outside the box body  261  and configured to drive the worm  268  to rotate. The outer column  22  is provided with a second slot  222  configured for a part of the driving wheel  267  extending into the outer column  22  and meshing with the transmission member  25 , that is, the driving wheel  267  is a spur gear and meshes with a spur rack for transmission. Of course, the driving wheel  267  can also be a helical gear, and the transmission member  25  is a helical rack. When adjusting the lifting of the inner column  23 , the user drives the worm  268  to rotate by the operating handle  269 , the worm  268  drives the turbine  264  to rotate, so that the third rotating shaft  262  rotates, and the third rotating shaft  262  rotates to drive the first transmission wheel  265  to rotate, and the first transmission wheel  265  rotates to drive the second transmission wheel  266  to rotate, and when the second transmission wheel  266  rotates, it drives the fourth rotating shaft  263  to rotate, and the fourth rotating shaft  263  rotates to drive the driving wheel  267  to rotate, and the driving wheel  267  rotates to drive the transmission member  25  to lift, so as to realize the lifting of the inner column  23 . Among them, the turbine  264  and the worm  268  have a self-locking function, which makes the inner column  23  stable at the current position. The first transmission wheel  265  and the second transmission wheel  266  have a good transmission function. The diameter of the first transmission wheel  265  is larger than the diameter of the second transmission wheel, which has a higher transmission ratio, saves effort. In other embodiments, the transmission mode of the transmission member  25  and the drive member  26  can also be connected by a conventional mechanical transmission mode such as chain transmission, screw transmission, worm gear transmission and the like. 
     As shown in  FIG. 8 ,  FIG. 10  and  FIG. 11 , the box body  261  includes: a semicircular plate  2611  fixed on the outer column  22  and half-enclosing the outer column  22 ; two side plates  2612  fixedly connected to the arc-shaped ends of the semicircular plate  2611 ; a top plate  2613 , a bottom plate  2614 , a front plate  2615  and a rear plate  2616  fixedly connected to the two side plates  2612  respectively; the front plate  2615  and the rear plate  2616  are configured to rotatably install the worm  268 , and the two side plates  2612  are configured to rotatably install the third rotating shafts  262  and the fourth rotating shaft  263 , the rear plate  2616  is provided with a second opening  26161  corresponding to the second slot  222 , the second opening  26161  and the second slot  222  are used to facilitate the engagement of the driving wheel  267  with the transmission member  25 . In the present embodiment, the outer column  22  passes through the box body  261 , and the semicircular plate  2611  facilitates the installation of the side plates  2612 . The third rotating shaft  262 , the fourth rotating shaft  263  and the worm  268  are all arranged to rotate through a bearing seat. The first transmission wheel  265 , the second transmission wheel  266 , the turbine  264  and the worm  268  are all arranged in the box body  261  to improve safety. In the present embodiment, each plate of the box body  261  is fixed by screws. 
     In the present disclosure, the top plate is further provided with a handle  26131  configured for supporting the user with one hand, so that the user can apply force to the operating handle  269 , and can prevent the stand assembly  2  from shaking. 
     As shown in  FIGS. 1 and 12 , in the present embodiment, the target plates  5  includes a small target plate and a large target plate, and the target plates  5  are installed through the beam assembly  3 . 
     Embodiment 5 
     In the Present Embodiment, on the Basis of the Foregoing Embodiments 1-4, as Shown in  FIGS. 1 to 18 , the Specific Structure of the Beam Assembly  3  is Described in Detail 
     As shown in  FIGS. 1, 3, 12, and 13 , the beam assembly  3  is arranged on the top of the stand assembly  2 . The beam assembly  3  includes: a mounting seat  31 , a beam  32 , a fixing block  33 , and a supporting rod  34 . Among them, the mounting seat  31  is fixed on the top of the stand assembly  2 , specifically, a mounting plate  234  is provided on the top of the inner column  23 , and the mounting seat  31  is installed on the mounting plate  234 . The gradienter  8  is installed on the mounting seat  31 . At least two beams  32  are provided, and each beam  32  can be folded toward the direction adjacent to the stand assembly  2 . Specifically, the extending direction of the beam  32  can be folded from the horizontal direction to the vertical direction, and can also be unfolded from the vertical direction to the horizontal direction. In the present embodiment, the beam  32  is folded down, and the bearing arm  12  is unfolded up, so that the beam  32  and the bearing arm  12  are adjacent to the outer periphery of the stand assembly  2 , thereby reducing the overall storage size of the calibration device for the vehicle ADAS and making it easy to carry. The laser  4  is arranged on the beam assembly  3  and is located on the symmetry line of the two beams  32 . At the same time, the laser  4  is also located on the extension line of the stand assembly  2  to facilitate the positioning of the laser  4 . 
     In the present embodiment, the bearing arm  12  of the foldable base  1  can be unfolded relative to the bearing seat  11  and stay at the current position stably, the beam  32  can also be unfolded from the horizontal direction to the vertical direction, and the bearing arm  12  and the beam  32  are unfolded relatively, so that when the calibration device for the vehicle ADAS is out of work, it occupy a smaller space and is convenient to carry, thereby facilitating the transportation and storage of the calibration device for the vehicle ADAS. 
     As shown in  FIGS. 1, 12 and 13 , there are two beams  32 , and the two beams  32  are symmetrically arranged on both sides of the mounting seat  31 , and the two beams  32  form straight line with the mounting seat  31  when unfolded. Each of the beams is provided with at least one fixing block  33 , the fixing block  33  is slidably disposed on the beam  32 , and each fixing block  33  can be configured to fix a small target plate individually. The beam  32  is provided with scale line for positioning the position of the fixing block  33 , the scale line is used to conveniently determine the distance between the fixing block  33  and the laser  8 , so as to facilitate the adjustment of the distance between the target plate  5  and the laser  8 . The supporting rod  34  is arranged on the mounting seat  31 , the length direction of the supporting rod  34  is perpendicular to the length direction of the beam  32 , and the supporting rod  34  is located on the symmetry line of the two beams  32 , that is, the length direction of the supporting rod  34  s the same as that of the stand assembly  2 . Since the supporting rod  34  is arranged on the mounting seat  31  and the mounting seat  31  is arranged on the stand assembly  2 , such that the length directions of the supporting rod  34  and the stand assembly  2  are overlapped, so that the supporting rod  34  will not interfere the sliding of the fixing block  33 , therefore, the supporting rod  34  does not need to be disassembled. 
     When a large target plate is installed, the supporting rod  34  is configured to hold the lower edge of the large target plate, and the two fixing blocks  33  are used to clamp the two sides of the large target plate to complete the fixing of the large target plate. In the present embodiment, since the supporting rod  34  is a fixed structure, such that the supporting rod  34  has good stability and accuracy when holding the large target plate. The beam assembly  3  of the present embodiment can install target plates  5  of various sizes, without other redundant workload, and the operation is simple. 
     As shown in  FIG. 13 , in the present embodiment, one end of the supporting rod  34  is fixed on the mounting seat  31 , the supporting rod  34  is fixed in the middle of the lower bottom of the mounting seat  31  by screws, and the other end of the supporting rod  34  is provided with a cross rod  341  whose length direction is perpendicular to that of the supporting rod  34 , the cross rod  341  is parallel to the beam  32 , so that the connecting line between the cross rod  341  and the two fixing blocks  33  is parallel. The cross rod  341  is provided with at least two supporting members  342  spaced apart and configured to hold the lower edge of the large target plate. The supporting member is provided at least two, which is configured to ensure that the large target plate is placed on the two supporting members  342  in a horizontal state, thereby ensuring the accuracy of positioning of the large target plate. 
     In the present embodiment, the supporting member  342  is provided with a limiting groove for supporting the lower edge of the large target plate, and the limiting groove is configured to fix the position of the large target plate. In the present embodiment, the supporting member  342  is arranged on the cross rod  341  by screws, so that the supporting member  342  can be detachably installed, so that the supporting member  342  with different limiting grooves can be replaced to be suitable for large target plates of different thicknesses. 
     In the present embodiment, the length of the cross rod  341  is less than the length of the mounting seat  31 . As shown in  FIG. 2 , when the calibration device for the vehicle ADAS is stored, the cross rod  341  does not occupy additional space, so that the calibration device for the vehicle ADAS occupies a smaller space when it is stored. 
     As shown in  FIG. 14 ,  FIG. 15  and  FIG. 16 , one end of the beam  32  is rotatably disposed on the mounting seat  31  through the fifth rotating shaft  321 , and the fifth shaft  321  can be a bolt. The beam  32  is provided with a first connection member  322  and the mounting seat  31 , the mounting seat  31  is provided with a second connection member  311 , and two beams  32  form in a horizontal straight line, that is, the beam  32  is in a unfolded state when the first connection member  322  and the second connection member  311  are connected. The two beams  32  can be bent down and fit the stand assembly  2 , that is, the beam  32  is in the folded storage state when the first connection member  322  is not connected with the second connection member  311 , as shown in  FIG. 2 , so that the calibration device for the vehicle ADAS occupies a smaller space when it is stored, and easy to be carried. The first connection member  322  is a fixed hook, and the second connection member  311  is a rotating hook. In other embodiments, the beam  32  and the mounting seat  31  can also be restricted from rotating by means of bolts or latches. 
     As shown in  FIGS. 15 and 17 , the fixing block  33  is provided with a tightening screw  331 , and the tightening screw  331  and the fixing block  33  are threadedly connected and can be abutted or separated from the beam  32 . In a preferred embodiment, the beam  32  is provided with a guide rail, and the fixing block  33  is slidably arranged on the beam  32  through the guide rail. The position of the fixing block  33  on the guide rail is fixed when the tightening screw  331  abuts the beam  32 ; and the fixing block  33  can slide on the beam  32  along the length direction of the guide rail when the tightening screw  331  separates from the beam  32 . The position of the fixing block  33  is slidable, so that it is convenient for fixing a target plate  5  of different sizes. The fixing block  33  is provided with an indicator arrow, which is used to indicate the scale line, which is convenient for determining the position of the fixing block  33  on the beam  32 . In other embodiments, the beam  32  is provided with a sliding groove, and the fixing block  33  is convexly provided with a protrusion that is slidably fitted into the sliding groove. The cross section of the sliding groove is in the shape of “ ”, and the cross section of the fixing block  33  and the protrusion is in the shape of “ ”, this can ensure that the fixing block  33  slides stably on the beam  32 . Or, the beam  32  is provided with a groove, and a guide rod is arranged in the groove, and the fixing block  33  partially extends into the groove and is sleeved on the guide rod, so as to realize a stable sliding connection of the fixing block  33  on the beam  32 . Of course, the sliding method of the fixing block  33  on the beam  32  can also adopt other methods such as screw drive, as long as the fixing block  32  can be stably slid on the beam  32 . 
     As shown in  FIGS. 15 and 17 , a side surface of the fixing block  33  is provided with a third slot  332 , and the third slot  332  is configured for the side edge of the large target plate being inserted into. Two fixing blocks  33  can clamp the edges of both sides of the large target plate, thereby preventing the large target plate from shaking left and right. 
     As shown in  FIGS. 15 and 17 , a rear side of the small target plate is provided with a first connection hole, and a side surface of the fixing block  33  configured for mounting the small target plate is concavely provide with a first magnet  333  configured for attracting the small target plate, and a first connection member  334  configured for connecting with the first connection hole. The first connection member  334  is firstly connected to the first connection hole on the small target plate, then the first magnet attracts the small target plate such that the small target plate and the side surface of the fixing block  33  are fit firmly, so as to ensure the firmness of installation of the small target plate. The fixing block  33  is provided with a counter bore, and the first magnet  333  is fixed in the counter bore by a screw. Among them, the rear side of the small target plate can be provided with a rear plate  42  to be described below, and the first connection hole is provided on the rear plate  42 . At this time, the first connection hole has the same structure as the second connection hole  421  to be described below. 
     Specifically, the first connection member  334  is a T-shaped member with a T-shaped vertical section, the first connection hole is a limiting connection hole that is connected to the first connection member  334 , and the small target plate is provided with a receiving groove communicated with the limiting connection hole, and the cross-sectional area of the receiving groove is larger than the cross-sectional area of the limiting connection hole. After the T-shaped member and the limiting connection hole are connected, the small target plate cannot be pulled out directly, so as to ensure the firmness of installation of the small target plate. 
     As shown in  FIGS. 17 and 18 , the T-shaped member is preferably a screw, and the limiting connection hole is preferably a gourd hole. The screw includes a second nut  3341 , a smooth section  3342  and a threaded section  3343  that are connected in sequence. The threaded section  3343  is configured for threadedly connecting the fixing block  33  to facilitate the disassembly and assembly of the screw. The length of the smooth section  3342  is approximately the same as the depth of the limiting connection hole, and the smooth section  3342  is configured to carry the small target plate. An outer diameter of the second nut  3341  is smaller than a diameter of a large hole of the limiting connection hole and greater than a small hole of the limiting connection hole, and the second nut  3341  passes through the large hole of the limiting connection hole and is fixed in the receiving groove during installation, and then the small target plate is pressed down so that the small hole of the limit connection hole and the smooth section  3342  are engaged. At this time, the second nut  3341  can restrict the small target plate from separating from the fixing block  33 , ensuring the stability of the small target plate being installed on the fixing block  33 . The screw is provided with two to prevent the small target plate from shaking left and right, since the structure of the first connection hole and the second connection hole  421  to be described below are the same, the specific structure of the first connection hole can refer to the following description of the second connection hole  421 . 
     Embodiment 6 
     In the present embodiment, on the basis of the foregoing embodiments 1-5, as shown in  FIGS. 1 to 22 , the installation method of the laser  4  and the mounting seat  31  is described in detail. 
     As shown in  FIGS. 1, 13, 19 and 20 , in the present embodiment, the laser  4  is arranged on the mounting seat  31  by a rotatable plate  41  and a hinge  43 . The rotatable plate  41  can be turned upwards by 180° such that the laser  4  is recessed on a side surface of the mounting seat  31  adjacent to the target plate  5 , so that the laser  4  does not need to be disassembled and will not interfere with the installation of the large target plate. 
     Specifically, the rotatable plate  41  is first arranged on the mounting seat  31  through the hinge  43 , and the laser  4  is detachably mounted on the rotatable plate  41 . Wherein, the side surface of the mounting seat  31  is substantially flush with the side surface of the stand assembly  2 , or recessed in the side surface of the stand assembly  2  to ensure that the mounting seat  31  will not affect the installation of the large target plate, the side surface of the stand assembly  2  refers to the side surface close to the target plate  5 . After the laser  4  is installed on the mounting seat  31  through the rotatable plate  41 , the laser  4  will protrude from the side surface of the mounting seat  31 . After the rotatable plate  41  is turned upward by 180°, based on the same side surface, the side surface of the mounting plate  234  facing away from the laser  4  is flush with the side surface of the mounting seat  31 , or the side surface of the mounting plate  234  facing away from the laser  4  is recessed inside the side surface of the mounting seat  31 . In this way, after the laser  4  is turned upward by 180°, it will not interfere with the installation of the large target plate, that is, the large target plate can be installed without disassembling the laser  4 , which saves time and effort and has a protective effect on the laser  4 , which effectively prevents the accident such as loss or damage to the laser  4  from occurring. In addition, the operation of the turning process is relatively simple, which saves the time for calibration of the calibration device for the vehicle ADAS. 
     Specifically, as shown in  FIGS. 20, 21 and 22 , the top of the mounting seat  31  is provided with a first mounting hole, the top surface of the mounting plate  234  is provided with a second mounting hole, the hinge  43  is fixed to the first mounting hole and the second mounting hole by screws, and the rotatable plate  41  are arranged on the mounting seat  31  by the hinge  43 . The hinge  43  includes two blades rotatably connected. One blade fits on the top of the mounting seat  31  through the screws and the first mounting hole, and the other blade fits on the top surface of the mounting plate  234  through the screw and the second mounting hole. The screw is provided with four, which are configured to ensure the firmness of installation of the hinge  43 . 
     In the present embodiment, the hinge  43  is a damping hinge, that is, after the laser  4  is installed on the rotatable plate  41 , and then rotatably arranged on the mounting seat  31  by the damping hinge. In this way, the rotatable plate  41  needs to be rotated under the action of external force. Thereby ensuring the stability of the position of the laser  4  and ensuring the accuracy of the laser  4  during detection. 
     As shown in  FIGS. 20 to 22 , a rear plate  42  is provided on the laser  4 , and the laser  4  and the rear plate  42  are connected by screws. The rear plate  42  and the rotatable plate  41  are detachably connected. Specifically, the rear plate  42  is provided with a second connection hole  421 , and the rotatable plate  41  is provided with a second connection member  411  configured to connect with the second connection hole  421 . The laser  4  is detachably connected to the rotatable plate  41  by the second connection member  411  of the rotatable plate  41  being connected to the second connection hole  421  of the rear plate  42 , thereby the installation and disassembly of the laser  4  is convenient. 
     As shown in  FIGS. 20 to 22 , the side of the rotatable plate  41  adjacent to the rear plate  42  is provided with a counter bore  413 , and the counter bore  413  is provided with a second magnet  412  that attracts the rear plate  42 . The second magnet  412  is fixed in the counter bore  413  by screws, and the counter bore  413  is configured to ensure that the surface of the rotatable plate  41  is flat, so as to prevent the second magnet  412  from affecting the installation of the rear plate  42 . In the present embodiment, the rotatable plate  41  and the rear plate  42  are made of steel materials, so that the second magnet  412  in the rotatable plate  41  can attract the rear plate  42  to further ensure firmness of the attachment between the rear plate  42  and the rotatable plate  41 . 
     As shown in  FIGS. 20 to 22 , the second connection hole  421  and the above first connection hole have the same structure, the second connection member  411  and the first connection member  334  are also T-shaped members having a T-shaped vertical section, the T-shaped member includes a connection rod and a limiting cap, and the T-shaped member is preferably a screw. That is, the connection rod is equivalent to the smooth section and the threaded section of the screw, the limiting cap is equivalent to the nut of the screw, and the specific structure of the screw has been described in the above embodiment 5, and the description is not repeated herein. 
     As shown in  FIG. 21 , in the present embodiment, the second connection hole  421  includes a receiving groove  4212  opened on the rear plate  42  and a limiting connection hole  4211  communicated with the receiving groove  4212 , a cross-sectional area of the receiving groove  4212  is greater than that of the limiting connection hole  4211 , and the limiting connection hole  4211  is arranged adjacent to the rotatable plate  41 . The receiving groove  4212  is configured for receiving the limiting cap. The limiting connection hole  4211  is preferably a gourd hole. That is, the limiting connection hole  4211  includes a large round hole and a small round hole that communicate with each other. The limiting cap can be fixed in the receiving groove through the limiting connection hole  4211 . Specifically, when the second connection member  411  is a screw, the diameter of the nut is smaller than that of the large round hole and greater than that of the small round hole, so that the nut can be inserted into the receiving groove  4212  through the large round hole, and then the smooth section of the screw is engaged with the small round hole to prevent the nut from detaching from the small round hole, which ensures the connection stability of the second connection member  334  and the second connection hole  421 . 
     As shown in  FIGS. 20 to 22 , an escape groove  312  is provided on the top of the mounting seat  31 , and the unfolded hinge  43  can be received in the escape groove  312 . In this way, after turning over, the rotatable plate  41  and the laser  4  can be placed horizontally on the top of the mounting seat  31  to ensure the stability of the laser  4  after turning over on the top of the mounting seat  31 . Specifically, the top shape of the mounting seat  31  can be set to match the top shape of the laser  4 , which is beneficial to protect the laser  4 . 
     Embodiment 7 
     In the present embodiment, on the basis of the foregoing embodiments 1-6, the use method and state of the calibration device for the vehicle ADAS are described in detail. 
     As shown in  FIG. 1 , the calibration device is in an unfolded state, at this time, the calibration device can be used for calibration. As shown in  FIG. 2 , the vehicle ADAS calibration device is in a folded storage state, at this time, the entire calibration device occupies a smaller space and is convenient to carry. 
     When the calibration device is required to perform the calibration work, the bearing arms  12  of the folding base are forced to be in the unfolded state and the beam  32  in the unfolded state, as shown in  FIG. 1 . 
     According to the calibration requirements, a small target plate is installed, as shown in  FIG. 1 , or a large target plate is installed, as shown in  FIG. 12 . Before installing the large target plate, you need to position the calibration device, and turn over the laser  4  180° by the rotatable plate  41 , so that the laser  4  does not affect the installation of the large target plate. 
     According to the calibration requirements, the position adjustment and positioning of the calibration device are realized through the brake-type universal wheels, so that the laser  4  is aligned with axis of the vehicle. In the process of position adjustment, the height adjusting member  7  is used to enable the calibration device to overcome obstacles and adjust the levelness of the calibration device. The levelness is determined by observing the gradienter  8 . 
     According to the calibration requirements, the inner column  23  is lifted through the transmission member  25  and the drive member  26  to change the height of the target plate  5 . When the target plate  5  is a small target plate, the position of the small target plate on the beam  32  can be achieved by sliding the fixing block  33 , and the specific value of the sliding of the fixing block  33  can be determined by the scale line on the beam  32 . Of course, other calibration operations are existing calibration requirements and will not be introduced in detail herein. 
     The aforementioned embodiments are only optional embodiments of the present disclosure, and should not be regarded as being limitation to the present disclosure. Any modification, equivalent replacement, improvement, and so on, which are made within the spirit and the principle of the present disclosure, should be included in the protection scope of the present disclosure.