Patent Description:
The application relates to the technical field of construction machinery, and in particular, to a crane and a control method therefor. <CIT> relates to an angle-related method for monitoring crane safety during the setup process of a crane, the crane having a sensor system and a crane control and the crane control receiving one or more measured values from the sensor system during the setup process and the received measurement value(s) against at least one corresponding one Compares limit values and triggers a measure if the limit value(s) are exceeded or fallen below. <CIT> discloses a tension sensor, a moment limiter and a crane. The tension sensor comprises a barrel, a sealing partition plate, a connecting section, a hydraulic detection device and a computation device, wherein the sealing partition plate is arranged on the connecting section and partitions the barrel into a first chamber and a second chamber; the first chamber or the second chamber is filled with hydraulic oil; the hydraulic detection device is used for detecting the intensity of pressure of the hydraulic oil; the computation device calculates the tension according to the intensity of pressure, and the stress area of the first chamber or the second chamber. <CIT> relates to a power limiter safety protection control method for a double hook hoisting crawler crane, and also relates to a force limiter safety protection device for a double hook hoisting crawler crane, and also relates to a double hook hoisting crawler crane including a safety limiter safety protection device.

The boom of transporter crane is segmented and needs to be installed or removed section by section when in use. In the course of disassembly and assembly of the boom, the luffing mechanism will be connected to the boom heel section of the boom. As shown in <FIG>, the boom <NUM> is now in a cantilevering state, which is equivalent to a cantilever beam, and the joint between the luffing mechanism <NUM> and the boom heel section <NUM> is stressed greatly. Generally, the structure of the joint is designed according to the allowable arm length. When the actual arm length is greater than the allowable value, it will cause the damage of the boom heel section and the luffing mechanism, and bring the risk of the boom falling to the ground. The existing safety measure is to paste the warning sign of the allowable arm length in the cab of truss crane, and add the corresponding content in the product manual. However, if the operator operates by mistake, it will still cause damage to the boom, pose a potential safety hazard.

The embodiment of the application provides a crane and a control method therefor. The aim is to avoid the problem that the boom and the luffing mechanism are damaged due to too long arm length.

The embodiment of the application provides a crane, including: a body, a boom, a luffing mechanism, a tension sensor; an angle sensor; and a controller; one end of the boom is rotationally connected with the body; the luffing mechanism is respectively connected with the body and the boom; the tension sensor is disposed on the luffing mechanism, and the tension sensor is used for detecting the tension value of the luffing mechanism to the boom; the angle sensor is disposed on the boom, and the angle sensor is used for detecting a horizontal inclination angle value of the boom; the controller is electrically connected with the tension sensor; the angle sensor; and the luffing mechanism, and the controller is configured to determine that the arm length of the boom exceeds the arm length threshold if the horizontal inclination angle value is less than an angle threshold and the tension value is greater than the tension threshold.

The crane according to one embodiment of the application, the boom includes a boom heel section rotationally connected with the body, and the angle sensor is disposed on the boom heel section.

The crane according to one embodiment of the application, the angle sensor is disposed at one end of the boom heel section near the body.

The crane according to one embodiment of the application further includes an in-place detecting sensor, where the in-place detecting sensor is disposed at the joint between the boom and the luffing mechanism, and the in-place detecting sensor is used for generating a trigger signal when the boom is being connected with the luffing mechanism;
The controller is electrically connected with the in-place detecting sensor, and the controller is configured to determine that the arm length of the boom exceeds the arm length threshold when the trigger signal is received and the tension value is greater than the tension threshold.

The crane according to one embodiment of the application, the in-place detecting sensor is disposed on the boom.

The crane according to one embodiment of the application, the in-place detecting sensor is a proximity switch or a travel switch.

The crane according to one embodiment of the application, the controller is disposed on the body.

The crane according to one embodiment of the application, the luffing mechanism is connected with the boom through a boom pull plate and a luffing rope, and the tension sensor is disposed on the boom pull plate or the luffing rope.

The crane according to one embodiment of the application, the luffing mechanism includes a fixed pulley block, a movable pulley block and a luffing rope, where the movable pulley block is connected with the fixed pulley block through the luffing rope, and the fixed pulley block is rotationally connected with the boom.

The embodiment of the application also provides a control method of crane, which includes:.

The embodiment of the application also provides a control device of crane, which includes: a tension value obtaining unit and a determining unit, the tension value obtaining unit is used for obtaining the tension value of the luffing mechanism to the boom; The determining unit is used for determining the arm length of the boom exceeds the arm length threshold if the tension value is greater than the tension threshold.

The embodiment of the application also provides a crane control device, which includes a memory, a processor and a computer program stored in the memory and running on the processor, when the processor executes the program, it implements the steps of the control method of the crane described above.

The embodiment of the application also provides a non-transient computer-readable storage medium on which a computer program is stored, when the computer program is executed by the processor, it implements the steps of the control method of the crane described above.

The crane and the control method therefor provided by the embodiment of the application detect the tension value of the luffing mechanism to the boom through the tension sensor, and determine whether the arm length of the boom exceeds the arm length threshold according to the tension value, thereby avoid the problem of overload damage to the boom.

To illustrate more clearly the embodiment of the application or the technical proposal in the prior art, a brief description of the accompanying drawings required for use in the description of the embodiment or the existing technology is provided below, Obviously, the attached drawings described below are some embodiments of this application, from which other drawings may be obtained without creative effort by those of ordinary skill in the art.

Reference numeral
<NUM>: crane; <NUM>: body; <NUM>. boom; <NUM>: boom heel section; <NUM>. luffing mechanism; <NUM>: boom pull plate; <NUM>: fixed pulley block; <NUM>: movable pulley block; <NUM>. tension sensor; <NUM>: first connection line; <NUM>. controller; <NUM>: angle sensor; <NUM>: second connection line; <NUM>. in-place detecting sensor; <NUM>: third connection line.

In order to make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below with reference to the drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, but not the whole embodiment.

The crane according to the embodiment of the present application will be described below with reference to <FIG>. As shown in <FIG>, the crane <NUM> includes a body <NUM>, a boom <NUM>, a luffing mechanism <NUM>, a tension sensor <NUM>, and a controller <NUM>.

As shown in <FIG>, one end of the boom <NUM> is rotationally connected to the body <NUM>. Specifically, in the embodiment, as shown in <FIG>, the boom <NUM> includes a boom heel section <NUM>, one end of which is rotationally connected to the body <NUM>.

As shown in <FIG>, the luffing mechanism <NUM> connects the body <NUM> and the boom <NUM>, respectively. The crane <NUM> can drive the boom <NUM> to rotate through the luffing mechanism <NUM> to complete the boom lifting. An end of the boom <NUM> close to the body <NUM> is regarded as the rear end of the boom <NUM>, an end of the boom <NUM> far away from the body <NUM> is regarded as the front end of the boom <NUM>, and the part of the boom <NUM> facing upwards in the cantilevering state is regarded as the top of the boom <NUM>. The luffing mechanism <NUM> is usually connected to the top of the boom <NUM>, for example, the luffing mechanism <NUM> is connected to the top of the front end of the boom heel section <NUM>. Specifically, as shown in <FIG>, in the embodiment, the luffing mechanism <NUM> includes a fixed pulley block <NUM>, a movable pulley block <NUM>, and a luffing rope (not shown in the drawing), where the movable pulley block <NUM> is connected to the fixed pulley block <NUM> through the luffing rope, the fixed pulley block <NUM> is rotatably connected to the boom <NUM>, and so the boom lifting can be completed by dragging the luffing rope with a winch, Wherein the rotating axis direction of the fixed pulley block <NUM> is the same as that of the boom <NUM>.

As shown in <FIG> and <FIG>, a tension sensor <NUM> is provided at the luffing mechanism <NUM>, and is used to detect a tension value of the luffing mechanism <NUM> to the boom <NUM>. A portion of the boom <NUM> in front of a connection point between the luffing mechanism <NUM> and the boom <NUM> generates a tension at the connection point, and a tension sensor <NUM> detects the tension formed at the connection point. The specific position of the tension sensor <NUM> on the luffing mechanism <NUM> may not be particularly limited. For example, the luffing mechanism <NUM> is connected to the boom <NUM> through the boom pull plate <NUM> and the luffing rope, and the tension sensor <NUM> may be disposed at the boom pull plate <NUM> to detect the tension of the boom pull plate <NUM>; The tension sensor <NUM> may also be disposed at the luffing rope to detect the tension of the luffing rope. Also one or more of the tension sensors <NUM> may be provided, for example two of the tension sensors <NUM> may be arranged symmetrically along the rotation axis of the boom <NUM>.

As shown in <FIG> and <FIG>, the controller <NUM> is electrically connected to the tension sensor <NUM> and the luffing mechanism <NUM>, and is configured to determine that the arm length of the boom <NUM> exceeds an arm length threshold if the tension value is greater than a tension threshold. The tension sensor <NUM> transmits the detected tension value to the controller <NUM> which can judge the arm length of the boom <NUM> according to the detected tension value. Usually, the larger the detected tension value, the longer the arm length of the boom <NUM>. Therefore, the controller <NUM> determines that the arm length of the boom <NUM> exceeds the arm length threshold when the tension value is greater than the tension threshold, and prohibits the luffing mechanism <NUM> from performing the boom lifting, thereby achieving the effect of avoiding overload damage to the boom <NUM>; the controller <NUM> determines that the arm length of the boom <NUM> does not exceed the arm length threshold when the tension value is smaller than the tension threshold, and allows the luffing mechanism <NUM> to perform the boom lifting. The controller <NUM> may be disposed on the body <NUM>, the luffing mechanism <NUM> or the boom heel section <NUM>, etc. For example, as shown in <FIG>, the controller <NUM> is disposed on the body <NUM>, and the controller <NUM> is electrically connected to the tension sensor <NUM> through the first connection line <NUM>. When the tension value is equal to the tension threshold, the judgment result of the controller <NUM> can be set according to the actual situation. In one case, the controller <NUM> determines that the arm length of the boom <NUM> exceeds the arm length threshold when the tension value is equal to the tension threshold; In another case the controller <NUM> determines that the arm length of the boom <NUM> does not exceed the arm length threshold when the pull value is equal to the tension threshold.

As shown in <FIG> and <FIG>, in the embodiment, the crane <NUM> further includes an angle sensor <NUM> provided on the boom <NUM>, and the angle sensor <NUM> is used for detecting the horizontal inclination angle of the boom <NUM>; The controller <NUM> is electrically connected to the angle sensor <NUM> and is configured to determine that the arm length of the boom <NUM> exceeds the arm length threshold if the horizontal inclination angle is less than an angle threshold and the tension value is greater than the tension threshold. The angle sensor <NUM> can detect the relative angle of the boom <NUM> to the horizontal plane (i.e., the horizontal inclination value), and transmit the detected horizontal inclination angle value to the controller <NUM>, the controller <NUM> can judge the working state of the boom <NUM> according to the detected horizontal inclination angle value. when the boom <NUM> is in a working state of self-loading and unloading, the boom <NUM> usually does not undergo an overload damage, so the subsequent protection may not be performed; When the boom <NUM> is in a working state of cantilevering, the subsequent protection is necessary. For example, when the angle sensor <NUM> detects that a horizontal inclination angle is greater than <NUM> degrees, the controller <NUM> determines that the boom <NUM> is now in a self-loading and unloading state, and the controller <NUM> will not perform the subsequent protection, allowing the luffing mechanism <NUM> to perform the boom lifting; when the angle sensor <NUM> detects that a horizontal inclination angle is less than <NUM> degrees, the controller <NUM> will continue to acquire the tension value of the tension sensor <NUM>. When the tension value is less than the tension threshold, the controller <NUM> determines that the arm length of the boom <NUM> does not exceed the arm length threshold and allows the luffing mechanism <NUM> to perform the boom lifting; when the tension value is greater than the tension threshold, the controller <NUM> determines that the arm length of the boom <NUM> exceeds the arm length threshold and prohibits the luffing mechanism <NUM> from performing the boom lifting, thereby achieving the effect of avoiding overload damage to the boom <NUM>. When the horizontal inclination angle is equal to the angle threshold, the judgment result of the controller <NUM> can be set according to the actual situation. In one case, the controller <NUM> determines that the boom <NUM> is in a self-loading and unloading state when the horizontal inclination angle is equal to the angle threshold; in another case, the controller <NUM> determines that the boom <NUM> is in a cantilevering state when the horizontal inclination angle is equal to the angle threshold. one or more angle sensors <NUM> may be provided, for example two angle sensors <NUM> may be symmetrically arranged along the rotation axis direction of the boom <NUM>.

An angle sensor <NUM> is provided on the boom <NUM>, as shown in <FIG> and <FIG>, the angle sensor <NUM> is generally disposed on the boom heel section <NUM>. In particular, in this embodiment, the angle sensor <NUM> is disposed on one end of the boom heel section <NUM> close to the body <NUM>, so as to facilitate wiring the angle sensor <NUM> to the controller <NUM>, where the angle sensor <NUM> is electrically connected to the controller <NUM> through a second connection line <NUM>.

As shown in <FIG> and <FIG>, in the embodiment, the crane <NUM> further includes an in-place detecting sensor <NUM> provided at the joint between the boom <NUM> and the luffing mechanism <NUM>, and the in-place detecting sensor <NUM> is used for generating a trigger signal when the boom <NUM> is connected with the luffing mechanism <NUM>. The controller <NUM> is electrically connected to the in-place detecting sensor <NUM>, and is configured to determine that the arm length of the boom <NUM> exceeds the arm length threshold if the trigger signal is received and the tension value is greater than the tension threshold. The in-place detecting sensor <NUM> can detect whether the boom <NUM> is connected to the luffing mechanism <NUM>, and when the boom <NUM> is not connected to the luffing mechanism <NUM>, the controller <NUM> may not perform the subsequent protection; when the boom <NUM> is connected to the luffing mechanism <NUM>, the in-place detecting sensor <NUM> will generate a trigger signal and transmit it to the controller <NUM>, and the controller <NUM> will determine whether the arm length of the boom <NUM> exceeds the arm length threshold according to the tension value or a combination of the tension value and the horizontal inclination angle. Wherein the in-place detecting sensor <NUM> may be a proximity switch or a travel switch or the like, and in this embodiment, the in-place detecting sensor <NUM> is electrically connected to the control <NUM> through a third connection line <NUM>.

The in-place detecting sensor <NUM> is disposed at the joint between the boom <NUM> and the luffing mechanism <NUM>, and may be disposed at the boom <NUM> or the luffing mechanism <NUM>, for example, as shown in <FIG> and <FIG>, in the embodiment, the in-place detecting sensor <NUM> is disposed at the top of the boom heel section <NUM>. One or more of the in-place detecting sensors <NUM> may be provided, for example two of the in-place detecting sensors <NUM> may be arranged symmetrically along the rotation axis direction of the boom <NUM>.

The control method of the crane according to the embodiment of the present application will be described below with reference to <FIG>, which is realized based on the crane as described above. As shown in <FIG>, the control method of crane according to the embodiment of the present application includes steps S710 to S720.

Step S710: obtaining the tension value of the luffing mechanism to the boom.

Specifically, the crane can detect the tension value of the luffing mechanism to the boom through the tension sensor, and transmit the detected tension value to the controller. Optionally, the tension sensor can detect the tension value of the luffing mechanism to the boom in real time or periodically.

Step S720: determining the arm length of the boom exceeds the arm length threshold if the tension value is greater than the force threshold.

Specifically, after obtaining the tension value of the luffing mechanism to the boom, the controller can determine the arm length of the boom according to the tension value of the luffing mechanism, and the controller determines that the arm length of the boom exceeds the arm length threshold when the tension value is greater than the tension threshold; the controller determines that the arm length of the boom does not exceed the arm length threshold when the tension value is less than the tension threshold; the judgment result of the controller can be set according to the actual situation when the tension value is equal to the tension threshold. In one case, the controller determines that the arm length of the boom exceeds the arm length threshold when the tension value is equal to the tension threshold; In another case, the controller determines that the arm length of the boom does not exceed the arm length threshold when the tension value is equal to the tension threshold.

Optionally, after determining whether the arm length of the boom exceeds the arm length threshold according to the tension value, the control method of the crane further includes: generating a protection signal if it is determined that the arm length of the boom exceeds the arm length threshold; and there is no protection signal is generated if it is determined that the arm length of the boom does not exceed the arm length threshold.

Specifically, the protection signal is used to prohibit the luffing mechanism from performing the boom lifting. When no protection signal is generated by the controller, no subsequent protection will be performed, and the luffing mechanism is allowed to perform the boom lifting; when the controller generates the protection signal, prohibiting the luffing mechanism from performing the boom lifting, so as to achieving the effect of avoiding overload damage to the boom <NUM>.

In addition to determining whether the arm length of the boom exceeds the arm length threshold according to the tension value, the controller can also determine whether the arm length of the boom exceeds the arm length threshold according to the tension value and the horizontal inclination value of the boom. Optionally, the controller may determine whether the arm length of the boom exceeds the arm length threshold according to the tension value and the horizontal inclination value through the following steps.

First, before performing step S720, obtaining the horizontal inclination value of the boom.

Specifically, the crane can detect the horizontal inclination value of the boom through an angle sensor, and transmit the detected horizontal inclination value to the controller. Optionally, the angle sensor can detect the horizontal inclination value of the boom in real time or periodically.

Then, determining the arm length of the boom exceeds the arm length threshold if the horizontal inclination value is less than an angle threshold and the tension value is greater than the tension threshold.

Specifically, the controller determines that the boom is in the self-loading and unloading state when the horizontal inclination value is greater than the angle threshold, and will not perform the step of determining whether the arm length of the boom exceeds the arm length threshold according to the tension value. the controller determines that the boom is in the cantilevering state when the horizontal inclination value is less than the angle threshold, and performs the step of determining whether the arm length exceeds the arm length threshold according to the tension value, that is, the controller determines that the arm length exceeds the arm length threshold when the horizontal inclination value is less than the angle threshold and the tension value is greater than the tension threshold; and the controller determines that the arm length does not exceed the arm length threshold when the horizontal inclination value is less than the angle threshold and the tension value is less than the tension threshold. When the horizontal inclination angle is equal to the angle threshold, the judgment result of the controller <NUM> can be set according to the actual situation. In one case, the controller <NUM> determines that the boom <NUM> is in a self-loading and unloading state when the horizontal inclination angle is equal to the angle threshold; in another case, the controller <NUM> determines that the boom <NUM> is in a cantilevering state when the horizontal inclination angle is equal to the angle threshold.

The controller can also determine whether the arm length of the boom exceeds the arm length threshold according to the tension value and the trigger signal. Optionally, the controller can determine whether the arm length of the boom exceeds the arm length threshold according to the tension value and the trigger signal through the following steps.

Specifically, step S720: determining the arm length of the boom exceeds the arm length threshold if the trigger signal is received and the tension value is greater than the tension threshold.

Specifically, the crane can detect whether the boom is connected with the luffing mechanism through the in-place detecting sensor. When the in-place detecting sensor detects that the boom is connected with the luffing mechanism, the in-place detecting sensor will generate a trigger signal and transmit it to the controller. When the controller does not receive the trigger signal, the step of determining whether the arm length of the boom exceeds the arm length threshold according to the tension value will not be performed; and when the controller receives the trigger signal, it performs the step of determining whether the arm length of the boom exceeds the arm length threshold according to the tension value. The in-place detecting sensor can detect whether the boom is connected with the luffing mechanism in real time or periodically.

The controller can also determine whether the arm length of the boom exceeds the arm length threshold according to the tension value, the horizontal inclination value and the trigger signal. Optionally, the controller can determine whether the arm length of the boom exceeds the arm length threshold according to the tension value, the horizontal inclination value and the trigger signal through the following steps.

First, determining whether the trigger signal is received.

Then, when the trigger signal is received, the controller executes the step of determining whether the arm length of the boom exceeds the arm length threshold according to the tension value and the horizontal inclination value, and when the trigger signal is not received, the controller does not execute the step of determining whether the arm length of the boom exceeds the arm length threshold according to the tension value and the horizontal inclination value.

The control device of the crane provided by the embodiment of this application is described below, the control device of the crane described below can correspondingly refer to the control method of the crane described above.

As shown in <FIG>, the control device of the crane provided by the embodiment of the present application can be the above-mentioned controller or partial structure of the controller, and the control device of the crane includes a tension value obtaining unit <NUM> and a determination unit <NUM>.

A tension value obtaining unit <NUM> is configured to obtain a tension value of the luffing mechanism to the boom; the determination unit <NUM> is configured to determine that the arm length of the boom exceeds the arm length threshold if the tension value is greater than the tension threshold.

<FIG> illustrates a physical structure schematic diagram of the control device of the crane. As shown in <FIG>, the control device of the crane provided by the embodiment of the present application can be the above-mentioned controller or partial structure of the controller. The control device of the crane may include processor <NUM>, communication interface <NUM>, memory <NUM> and communication bus <NUM>. The processor <NUM>, the communication interface <NUM> and the memory <NUM> communicate with each other through the communication bus <NUM>. The processor <NUM> can call the logic instructions in the memory <NUM> to execute the control method of the crane. The method includes: obtaining a tension value of the luffing mechanism to the boom; and determining the arm length of the boom exceeds the arm length threshold if the tension value is greater than the tension threshold.

In addition, the above-mentioned logic instructions in the memory <NUM> can be implemented in the form of software functional units, and can be stored in a computer-readable storage medium when sold or used as an independent product. With this understanding, the essential technical scheme of this application, or the part of the technical scheme of this application that contributes to the prior art, or the part of this technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) perform all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage media include: USB Disk, mobile hard disk, Read-Only Memory (ROM), Random Access Memory (RAM), magnetic disk or laser disc and other media that can store program codes.

On the other hand, the embodiment of the present application also provides a computer program product, which includes a computer program stored on a non-transient computer readable storage medium, and the computer program includes program instructions, and when the program instructions are executed by a computer, the computer can execute the control methods of cranes provided by the above method embodiments. The control method includes the following steps: obtaining the tension value of the luffing mechanism to the boom; determining the arm length of the boom exceeds the arm length threshold if the tension value is greater than the tension threshold.

On the other hand, the embodiment of the present application also provides a non-transient computer readable storage medium, on which a computer program is stored, and the computer program is implemented when executed by a processor to execute the control method of the crane provided by the above embodiments, and the control method includes: obtaining the tension value of the luffing mechanism to the boom; determining the arm length of the boom exceeds the arm length threshold if the tension value is greater than the tension threshold.

Claim 1:
A crane, comprising:
a body (<NUM>),
a boom (<NUM>), one end of the boom (<NUM>) is rotationally connected with the body (<NUM>);
a luffing mechanism (<NUM>), connected with the body (<NUM>) and the boom (<NUM>) respectively;
a tension sensor (<NUM>), disposed on the luffing mechanism (<NUM>), and the tension sensor (<NUM>) is used for detecting a tension value of the luffing mechanism (<NUM>) to the boom (<NUM>);
an angle sensor (<NUM>), wherein the angle sensor (<NUM>) is disposed on the boom (<NUM>), and the angle sensor (<NUM>) is used for detecting a horizontal inclination angle value of the boom (<NUM>);
a controller (<NUM>), electrically connected with the tension sensor (<NUM>), the angle sensor (<NUM>) and the luffing mechanism (<NUM>);
characterised in that
the controller (<NUM>) is configured to determine that the arm length of the boom (<NUM>) exceeds the arm length threshold if the horizontal inclination angle value is less than an angle threshold and the tension value is greater than the tension threshold.