Crane protection device detection method, device, system and storage medium

Abstract

This application discloses a crane protection device detection method, system, device, and storage medium. The method includes: controlling the crane hook to lower at a speed greater than or equal to a first preset threshold, detecting a first current in an overspeed protection switch, and determining that the overspeed protection switch is operating normally; controlling the crane motor stator to de-energize, detecting a second current caused by the stator power failure protection switch operating, and determining that the stator power failure protection switch is operating normally; controlling the crane hook to rise to a first preset height, detecting a third current after the first limit switch is disconnected, and determining that the first limit switch is operating normally; closing a backup switch, controlling the crane hook to continue rising to a second preset height, causing the second limit switch to operate, detecting a fourth current after the second limit switch operates, and determining that the second limit switch is operating normally. This method can reduce safety risks and is widely applicable in the field of switch detection technology.

Description

Technical Field

[0001] The present application relates to the field of switch detection technology, and in particular to a crane protection device detection method, device, system and storage medium. Background Art

[0002] When inspecting a crane, it is necessary to inspect the crane's protective devices, which mainly include an overspeed protection switch, a stator power failure protection switch, and two limit switches.

[0003] Prior art testing of crane protective devices typically involves disassembling the switch and then using a small device to simulate the device's operating scenario for testing, or testing the device individually. However, the disassembly and simulation methods fail to accurately simulate specific crane scenarios, while individual testing wastes human and material resources and increases risks to personnel safety. Therefore, a new method for testing crane protective devices is urgently needed. Summary of the Invention

[0004] The purpose of this application is to solve one of the technical problems existing in the prior art to at least a certain extent.

[0005] To this end, an object of an embodiment of the present application is to provide a crane protection device detection method, system, device and storage medium, which can save manpower and material resources and reduce safety risks.

[0006] In order to achieve the above technical objectives, the technical solutions adopted in the embodiments of the present application include: controlling the crane hook to fall at a speed greater than or equal to a first preset threshold value, so that the overspeed protection switch is activated, the hook is braked, and the first current of the first detection circuit is detected when the overspeed protection switch is activated; according to the first current, it is determined that the overspeed protection switch is a normal protection switch; controlling the crane motor stator to cut off power, so that the stator power failure protection switch is activated, and detecting the second current of the second detection circuit when the stator power failure protection switch is activated; according to the second current, it is determined that the stator power failure protection switch is a normal protection switch; controlling the crane hook to rise to a first preset height, so that the first limit switch is disconnected The control circuit is configured to detect a third current in the third detection circuit after the first limit switch is disconnected; based on the third current, it is determined that the first limit switch is a normal protection switch; if the first limit switch is a normal protection switch, the standby switch is closed, the crane hook is controlled to continuously rise to a second preset height, the second limit switch is actuated, and the fourth current in the third detection circuit after the second limit switch is actuated is detected; based on the fourth current, it is determined that the second limit switch is a normal protection switch; when the overspeed protection switch, the stator power failure protection switch, the first limit switch, and the second limit switch are all normal protection switches, it is determined that the protection device is a normal protection device.

[0007] In addition, the crane protection device detection method according to the above embodiment of the present invention may also have the following additional technical features:

[0008] Furthermore, in an embodiment of the present application, the first preset threshold is a, the rated speed of the crane is b, and the first preset threshold and the rated speed satisfy the formula: 1.25b≤a≤1.4b.

[0009] Furthermore, in an embodiment of the present application, the following steps are also included: if the first limit switch is a fault switch, controlling the crane hook to continuously rise to a second preset height to activate the second limit switch, and detecting the fourth current of the fourth detection circuit after the second limit switch is activated.

[0010] Furthermore, in an embodiment of the present application, the step of determining that the overspeed protection switch operates as a normal protection switch based on the first current specifically includes: when the first current is greater than or equal to the first preset current threshold, determining that the overspeed protection switch is a normal protection switch.

[0011] Furthermore, in an embodiment of the present application, the backup switch is connected in parallel with the first limit switch.

[0012] On the other hand, an embodiment of the present application further provides a crane protection device detection system, comprising:

[0013] a control unit, configured to control the crane hook to fall at a speed greater than or equal to a first preset threshold value, thereby actuating the overspeed protection switch, and to control the crane motor stator to be de-energized, thereby actuating the stator power failure protection switch, and to control the crane hook to rise to a first preset height, thereby opening the first limit switch, and closing the standby switch, thereby controlling the crane hook to continue rising to a second preset height; a detection unit, configured to detect a first current in a first detection circuit when the overspeed protection switch is actuated, a second current in a second detection circuit when the stator power failure protection switch is actuated, a third current in a third detection circuit when the first limit switch is opened, and a fourth current in the third detection circuit when the second limit switch is actuated; and a first processing unit, configured to determine, based on the first current, that the overspeed protection switch is a normal protection switch, that the stator power failure protection switch is a normal protection switch, that the first limit switch is a normal protection switch, and that the second limit switch is a normal protection switch based on the fourth current. The second processing unit is configured to determine that the protection device is a normal protection device when the overspeed protection switch, the stator power failure protection switch, the first limit switch, and the second limit switch are all normal protection switches.

[0014] Furthermore, in an embodiment of the present application, the control unit includes a control module and a speed detection module.

[0015] Furthermore, in an embodiment of the present application, the detection unit includes a current sensor or a current detection clamp.

[0016] On the other hand, the present application also provides a crane protection device detection device, comprising:

[0017] at least one processor;

[0018] at least one memory for storing at least one program;

[0019] When the at least one program is executed by the at least one processor, the at least one processor implements a crane protection device detection method as described in any one of the invention contents.

[0020] In addition, the present application also provides a storage medium storing processor-executable instructions, wherein the processor-executable instructions are used to execute a crane protection device detection method as described in any one of the above items when executed by the processor.

[0021] The advantages and benefits of this application will be partially given in the following description, and partially become apparent from the following description, or learned through practice of this application:

[0022] The present application can simulate the triggering scenario required by the crane safety switch and activate the crane safety switch through different controls, and determine whether the crane safety switch is faulty by detecting the loop current of different switches when they are activated; this method can reduce the waste of human resources and reduce safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the steps of a crane protection device detection method in a specific embodiment of the present invention;

[0024] Figure 2 This is a structural diagram of a crane detection system in a specific embodiment of the present invention;

[0025] Figure 3 It is a structural schematic diagram of a crane detection device in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings to illustrate the principles and processes of the crane protection device detection method, system, device and storage medium in the embodiments of the present invention.

[0027] This application proposes a new crane protection device detection method, referring to Figure 1 , the detection method comprises the following steps:

[0028] S1. Control the crane hook's lowering speed to be greater than or equal to a first preset threshold value, activate the overspeed protection switch, brake the hook, and detect a first current in a first detection circuit when the overspeed protection switch is activated;

[0029] In this step, the first preset threshold is the speed threshold defined by relevant personnel; the first detection circuit refers to the circuit that controls the free fall of the crane hook and detects the speed, and is the circuit where the overspeed protection switch is located; the drop of the crane hook can be controlled by connecting the overspeed test contactor in series with the front section of the brake to open the brake inside the crane, thereby allowing the hook to fall freely with a light load and measuring the descent speed of the crane. When the speed is greater than or equal to the preset speed threshold, the overspeed protection switch of the crane will be triggered, and the first current of the first detection circuit will be detected and sampled by the high-precision rotary encoder of the detection module. Based on the first current, it can be determined whether the overspeed protection switch is faulty.

[0030] S2. Determining, based on the first current, that the overspeed protection switch is a normal protection switch;

[0031] In this step, the overspeed protection switch is a normally open switch, and the first current is the loop current of the first detection circuit when the overspeed protection switch is normally closed. Based on the first current, it can be determined whether the overspeed protection switch can operate normally when the crane hook drops at a speed greater than or equal to a certain speed. If the overspeed protection switch can be closed normally, the current of the first detection circuit will be greater than or equal to a certain current threshold. By setting the threshold, it can be determined whether the overspeed protection switch is closed normally.

[0032] S3, controlling the crane motor stator to be powered off, causing the stator power failure protection switch to operate, and detecting the second current of the second detection circuit when the stator power failure protection switch is operated;

[0033] In this step, the second detection circuit can be the electrical circuit where the crane motor stator is located, and the stator power failure protection switch is a normally open switch. When the crane motor stator is powered off, the stator power failure protection switch can be closed. When the stator power failure protection switch is closed, the current in the circuit can be detected by the detection device, and the current can be used to determine whether the stator power failure protection switch is activated.

[0034] S4. Determine, based on the second current, that the stator power failure protection switch is a normal protection switch;

[0035] In this step, a current threshold may be set first. When the stator power failure protection switch is closed, the current of the second detection circuit may be detected. By comparing the second current with the current threshold, it is determined whether the stator power failure protection switch is closed normally.

[0036] S5. Control the crane hook to rise to a first preset height, disconnect the first limit switch, and detect a third current in the third detection circuit when the first limit switch is closed;

[0037] In this step, the third detection circuit can be the electrical circuit where the first limit switch of the crane is located, and the first limit switch is a normally closed switch. When the hook of the crane rises to the first preset height, the first limit switch can be disconnected. When the first limit switch is disconnected, the current of the circuit can be detected by the detection device, and the current can be used to determine whether the first limit switch is actuated.

[0038] S6. Determine, based on the third current, that the first limit switch is a normal protection switch;

[0039] In this step, a current threshold may be set first. When the first limit switch is disconnected, the current of the third detection circuit may be detected. By comparing the third current with the current threshold, it is determined whether the first limit switch is normally disconnected.

[0040] S7. If the first limit switch is a normal protection switch, close the standby switch, control the crane hook to continue to rise to a second preset height, activate the second limit switch, and detect the fourth current of the fourth detection circuit when the second limit switch is activated;

[0041] In this step, since the detection circuit of the first limit switch and the second limit switch is the same circuit, when the first limit switch is normally disconnected, it is necessary to close the standby switch to keep the third detection circuit working normally, and then control the crane hook to continue to rise to the second preset height to activate the second limit switch. The second limit switch is a normally closed switch, and the current of the detection circuit after disconnection can be used to determine whether the second limit switch can be closed normally. It should be noted that the second preset height is a pre-set height, which can be adjusted according to actual conditions.

[0042] S8. Determine, based on the fourth current, that the second limit switch is a normal protection switch;

[0043] In this step, a current threshold can be set first. When the second limit switch is disconnected, the fourth current of the third detection circuit can be detected, and whether the second limit switch is normally disconnected can be determined by comparing the third and fourth currents with the current threshold.

[0044] S9. When the overspeed protection switch, the stator power failure protection switch, the first limit switch, and the second limit switch are all normal protection switches, determining that the protection device is a normal protection device;

[0045] In this step, only when the overspeed protection switch, stator power failure protection switch, first limit switch, and second limit switch are all functioning normally can the crane's protection device be determined to be functioning properly. Specifically, the normal and faulty results of the overspeed protection switch, stator power failure protection switch, first limit switch, and second limit switch, along with the protection device results, are binarized: a normal overspeed protection switch is 1, and a faulty overspeed protection switch is 0. All test results are then linked together through an AND operation to obtain the protection device result. If any one or more protection switches fail to function properly, the crane's protection device is faulty, and personnel can identify the source of the fault and perform repairs.

[0046] Furthermore, the first preset threshold is a, and the rated speed of the crane is b. The first preset threshold and the rated speed can satisfy the formula: 1.25b≤a≤1.4b. Specifically, the first preset threshold can be 1.25 to 1.4 times the rated speed, which can be adjusted based on the specific equipment. The rated speed is the speed of the crane hook during normal downward movement as required by regulations.

[0047] Furthermore, the detection method may also include the following steps: if the first limit switch is a fault switch, controlling the crane hook to continue to rise to a second preset height, actuating the second limit switch, and detecting the fourth current of the fourth detection circuit when the second limit switch is actuated; specifically, when the first limit switch cannot be disconnected normally, there is no need to close the standby switch, and the crane can be controlled to continue to rise to the second preset height, actuating the second limit switch, and detecting the fourth current of the fourth detection circuit after the second limit switch is disconnected; it should be noted that the second preset height is a pre-set height, which can be adjusted according to actual conditions.

[0048] Furthermore, the step of determining that the overspeed protection switch operates as a normal protection switch based on the first current specifically includes: when the first current is greater than or equal to the first preset current threshold, determining that the overspeed protection switch is a normal protection switch; specifically, a first preset current threshold can be set, and when the first current is greater than or equal to the first preset current threshold, the overspeed protection switch can be determined to be a normal protection switch; if the first current is less than the first preset current threshold, the overspeed protection switch can be determined to be a normal protection switch

[0049] Furthermore, the backup switch is connected in parallel with the first limit switch. In order to continue testing the second limit switch, the parallel backup switch can replace the first limit switch to close and conduct the control circuit normally when the first limit switch is normally opened.

[0050] In addition, refer to Figure 2 ,and Figure 1 Corresponding to the method, an embodiment of the present application further provides a crane detection system, including:

[0051] The control unit 101 is configured to control the crane hook to descend at a speed greater than or equal to a first preset threshold value, thereby actuating an overspeed protection switch, and to control the crane motor stator to be de-energized, thereby actuating a stator power failure protection switch, and to control the crane hook to ascend to a first preset height, thereby opening a first limit switch, and closing a standby switch, thereby controlling the crane hook to continue ascending to a second preset height.

[0052] a detection unit 102, configured to detect a first current in the first detection circuit when the overspeed protection switch is actuated, a second current in the second detection circuit when the stator power failure protection switch is actuated, a third current in the third detection circuit when the first limit switch is disconnected, and a fourth current in the third detection circuit when the second limit switch is actuated;

[0053] The first processing unit 103 is used to determine that the overspeed protection switch is a normal protection switch based on the first current, and to determine that the stator power failure protection switch is a normal protection switch based on the second current, and to determine that the first limit switch is a normal protection switch based on the third current, and to determine that the second limit switch is a normal protection switch based on the fourth current.

[0054] The second processing unit 104 is configured to determine that the protection device is a normal protection device when the overspeed protection switch, the stator power failure protection switch, the first limit switch, and the second limit switch are all normal protection switches.

[0055] Furthermore, in some embodiments of the present application, the control unit may include a control module and a speed detection module; the control module may control the crane to perform different actions, and the speed detection module may detect the falling speed of the hook; the circuit in which the control unit is located may be different from the detection circuit.

[0056] Furthermore, in some embodiments of the present application, the detection unit may include a current sensor or a current detection clamp; both devices can measure the current of the detection loop.

[0057] The crane protection device detection method is described below with reference to specific embodiments;

[0058] In this embodiment, the first limit switch is a weight switch;

[0059] First, before the test begins, the overspeed test contactor can be connected in series with the front section of the brake, and the stator power-off test contactor can be connected in series between the up / down contactor of the crane and the motor. The stator power-off test contactor can control whether the motor stator loses power. The fast switching switch can be connected in parallel to both sides of the heavy hammer switch of the lifting molten crane. The safety test module is a normally open contact switch and is connected in parallel with a voltage detection meter. The voltmeter displays the voltage of the crane heavy hammer switch in real time.

[0060] Secondly, when conducting the test, the first step can be to conduct a crane hook drop test. The crane brake can be opened through the overspeed test contactor to allow the crane hook to fall freely with a light load. Then, the high-precision rotary encoder of the speed detection module is used to measure the crane's descent speed. The first current of the sampling test circuit is detected by the dedicated current detection jaws of the detection module to determine whether the crane overspeed protection switch has a normal operating speed.

[0061] The second step is to perform a motor stator power-off test. The control module sends a test instruction to control the stator power-off test contactor to cut off the power, truly simulating the abnormal power-off of the motor. Then, the current sensor is used to detect the second current of the second detection circuit. Based on the second current, it is determined whether the stator power-off protection switch is working normally.

[0062] The last step is to conduct a continuous lifting test of the crane hook to control the continuous lifting of the crane hook. When the crane hook is continuously lifted to the first height, the heavy hammer switch can be triggered to disconnect. If the heavy hammer switch is normally disconnected, the voltage detection meter will have no voltage display. At this time, the fast switching switch needs to be closed, and the circuit is connected to continue to lift the hook to the second height, so that the second height limit is activated. The circuit current after the action is detected by the special current detection jaws to determine whether the second limit switch is operating normally.

[0063] Finally, it is determined whether the protection device is normal based on the test results of the first, second and last steps.

[0064] and Figure 1 Corresponding to the method, the embodiment of the present application also provides a crane detection device, the specific structure of which can be referred to Figure 3 ,include:

[0065] at least one processor 1001;

[0066] At least one memory 1002, configured to store at least one program;

[0067] When the at least one program is executed by the at least one processor, the at least one processor implements the crane protection device detection method.

[0068] The contents of the above method embodiments are all applicable to the present device embodiments. The functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0069] and Figure 1 Corresponding to the method, an embodiment of the present application further provides a storage medium storing processor-executable instructions, which are used to execute the crane protection device detection method when executed by the processor.

[0070] In some optional embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiments presented and described in the flow chart of the present application are provided in an exemplary manner for the purpose of providing a more comprehensive understanding of the technology. The disclosed method is not limited to the operations and logical flows presented herein. Optional embodiments are contemplated in which the order of the various operations is changed and the sub-operations described as a part of a larger operation are performed independently.

[0071] In addition, although the present application is described in the context of functional modules, it should be understood that, unless otherwise stated, one or more of the functions and / or features may be integrated into a single physical device and / or software module, or one or more functions and / or features may be implemented in separate physical devices or software modules. It is also understood that a detailed discussion of the actual implementation of each module is not necessary for understanding the present application. More specifically, given the properties, functions, and internal relationships of the various functional modules in the devices disclosed herein, the actual implementation of the module will be understood within the routine skills of an engineer. Therefore, a person skilled in the art can implement the present application as set forth in the claims using ordinary techniques without undue experimentation. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present application, which is determined by the full scope of the appended claims and their equivalents.

[0072] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several programs for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0073] The logic and / or steps represented in a flowchart or otherwise described herein, for example, may be considered as an ordered list of executable programs for implementing the logical functions, and may be embodied in any computer-readable medium for use by, or in conjunction with, a program execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can retrieve and execute a program from a program execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, a program execution system, apparatus, or device.

[0074] More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0075] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable program execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0076] In the above description of this specification, reference to the terms "one embodiment / example," "another embodiment / example," or "certain embodiments / examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0077] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

[0078] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A crane protection device detection method, characterized in that: Protective devices for detecting cranes, including: controlling the crane hook to drop at a speed greater than or equal to a first preset threshold, actuating an overspeed protection switch to brake the hook, and detecting a first current in a first detection circuit when the overspeed protection switch is actuated; determining, based on the first current, that the overspeed protection switch is a normal protection switch; Controlling the crane motor stator to cut off power, causing the stator power failure protection switch to operate, and detecting the second current of the second detection circuit when the stator power failure protection switch is operated; determining, based on the second current, that the stator power-off protection switch is a normal protection switch; controlling the crane hook to rise to a first preset height, disconnecting the first limit switch, and detecting a third current of the third detection circuit after the first limit switch is disconnected; determining, based on the third current, that the first limit switch is a normal protection switch; If the first limit switch is a normal protection switch, close the standby switch, control the crane hook to continue to rise to a second preset height, activate the second limit switch, and detect the fourth current of the third detection circuit after the second limit switch is activated; determining, based on the fourth current, that the second limit switch is a normal protection switch; When the overspeed protection switch, the stator power failure protection switch, the first limit switch, and the second limit switch are all normal protection switches, it is determined that the protection device is a normal protection device.

2. A crane protection device detection method according to claim 1, characterized in that: The first preset threshold is a, the rated speed of the crane is b, and the first preset threshold and the rated speed satisfy the formula: 1.25b≤a≤1.4b.

3. A crane protection device detection method according to claim 1, characterized in that: Also includes the steps: If the first limit switch is a fault switch, the crane hook is controlled to continue to rise to a second preset height to activate the second limit switch, and the fourth current of the fourth detection circuit is detected after the second limit switch is activated.

4. A crane protection device detection method according to claim 3, characterized in that: The step of determining, based on the first current, that the overspeed protection switch operates as a normal protection switch specifically further includes: When the first current is greater than or equal to a first preset current threshold, it is determined that the overspeed protection switch is a normal protection switch.

5. A crane protection device detection method according to claim 1, characterized in that: The backup switch is connected in parallel with the first limit switch.

6. A crane detection system, characterized in that: include: a control unit, configured to control the crane hook to drop at a speed greater than or equal to a first preset threshold value, thereby actuating an overspeed protection switch, and to control the crane motor stator to be de-energized, thereby actuating a stator power failure protection switch, and to control the crane hook to rise to a first preset height, thereby opening a first limit switch, and closing a standby switch, thereby controlling the crane hook to continue rising to a second preset height; a detection unit, configured to detect a first current in the first detection circuit when the overspeed protection switch is actuated, a second current in the second detection circuit when the stator power failure protection switch is actuated, a third current in the third detection circuit when the first limit switch is disconnected, and a fourth current in the third detection circuit when the second limit switch is actuated; a first processing unit, configured to determine, based on the first current, that the overspeed protection switch is a normal protection switch, determine, based on the second current, that the stator power failure protection switch is a normal protection switch, determine, based on the third current, that the first limit switch is a normal protection switch, and determine, based on the fourth current, that the second limit switch is a normal protection switch; The second processing unit is configured to determine that the protection device is a normal protection device when the overspeed protection switch, the stator power failure protection switch, the first limit switch, and the second limit switch are all normal protection switches.

7. A crane detection system according to claim 6, characterized in that: The control unit includes a control module and a speed detection module.

8. A crane detection system according to claim 6, characterized in that: The detection unit includes a current sensor or a current detection clamp.

9. A crane detection device, characterized in that include: at least one processor; at least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the crane protection device detection method according to any one of claims 1 to 5.

10. A storage medium storing instructions executable by a processor, characterized in that: The processor-executable instructions are used to execute the crane protection device detection method according to any one of claims 1 to 5 when executed by the processor.

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