Limiting device resetting system, tower crane and limiting device resetting method

Abstract

The application relates to the technical field of engineering machinery, and discloses a limiter resetting system, a tower crane and a limiter resetting method. The limiter resetting system can generate and send a one-key resetting signal through a man-machine interaction device, a control device controls an adjusting module to drive a cam assembly to rotate in a resetting direction in response to the one-key resetting signal, and controls the adjusting module to drive the cam assembly to rotate in a calibration direction again in response to a position signal sent when the micro-switch module is triggered by the cam assembly; when the micro-switch module is determined to be untriggered, the adjusting module is controlled to stop driving, so that the cam assembly stops rotating and the resetting is completed. Therefore, the automatic resetting of the stroke limiter is realized, manual debugging of the limiter is not needed, the labor intensity is reduced, and the work efficiency is improved. The application is applied to the tower crane to improve the work efficiency and greatly reduce the operation risk.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, specifically to a limit switch reset system, a tower crane, and a limit switch reset method. Background Technology

[0002] The travel limit switch is mainly composed of an input shaft driving a high-ratio reducer and its synchronous adjustable cam and switch. This device is safe and reliable and is widely used in the spatial three-coordinate control and limit of tower cranes, port cranes and other transmission machinery. It features small size, high precision and strong versatility.

[0003] Currently, tower cranes have largely entered the era of intelligent operation. The calibration of mechanical limit switches is generally based on the measurement values ​​of the encoder in the transmission mechanism. However, calibrating the encoder values ​​requires operating the transmission mechanism up / down, forward / backward, and left / right. Because the cam inside the travel limit switch may be very close to the microswitch, even a small movement of the cam can trigger the limit switch and stop operation. In this situation, equipment commissioning personnel must climb to the location of the transmission mechanism, remove the limit switch cover, and adjust the limit switch cam position away from the microswitch to complete the calibration of the encoder values. This operation is inefficient and highly dangerous. Summary of the Invention

[0004] The purpose of this application is to provide a limit switch reset system, a tower crane, and a limit switch reset method to solve the problems of low operating efficiency and high danger in the prior art.

[0005] To achieve the above objectives, in a first aspect, this application provides a limit switch reset system, comprising:

[0006] The travel limiter includes a housing and a cam module, a micro switch module, and an adjustment module arranged within the housing. The adjustment module is used to drive the cam assembly in the cam module to rotate, and the cam assembly is used to trigger the micro switch module.

[0007] Human-computer interaction device for generating and sending a one-key reset signal; and

[0008] The control device is configured as follows:

[0009] In response to the one-key reset signal, the adjustment module is controlled to drive the cam assembly to rotate in the reset direction;

[0010] In response to the positioning signal emitted when the micro switch module is triggered by the cam assembly, the adjustment module is controlled to drive the cam assembly to rotate again in the calibrated direction;

[0011] When the micro switch module is detrimentalized, the adjustment module is controlled to stop driving.

[0012] As a further improvement to the above technical solution:

[0013] In conjunction with the first aspect, in one possible implementation, the adjustment module includes:

[0014] A base is disposed on the cam module and can rotate with the cam module;

[0015] Multiple drive components are disposed on the base, and the drive components are drively connected to the cam adjustment shafts of the corresponding cam components in the cam module; and

[0016] A control circuit board is disposed on the base, the control circuit board being electrically connected to the drive assembly and communicatively connected to the control device.

[0017] In conjunction with the first aspect, in one possible implementation, the driving component includes:

[0018] Drive motor with built-in reducer; and

[0019] The mechanical transmission mechanism is connected to the output shaft of the reducer and the cam adjustment shaft, respectively.

[0020] In conjunction with the first aspect, in one possible implementation, the control device communicates with the adjustment module and the micro switch module via wired or wireless communication.

[0021] In conjunction with the first aspect, in one possible implementation, the human-computer interaction device and the control device communicate via wired or wireless means.

[0022] In conjunction with the first aspect, in one possible implementation, the human-computer interaction device includes a display screen having a mechanical button and / or a virtual button for inputting the one-key reset signal.

[0023] To achieve the above objectives, in a second aspect, this application also provides a limit switch reset method, which utilizes the limit switch reset system provided according to the first aspect above, the limit switch reset method comprising:

[0024] A one-key reset signal is sent through the human-computer interaction device;

[0025] The cam assembly is driven to rotate in the reset direction according to the one-key reset signal;

[0026] When the cam assembly triggers the micro switch module, the cam assembly is driven to rotate again in the calibrated direction;

[0027] When the cam assembly releases the trigger on the micro switch module, the rotation of the cam assembly is stopped.

[0028] To achieve the above objectives, in a third aspect, this application also provides a tower crane, including a hoisting transmission mechanism, a slewing transmission mechanism, a luffing transmission mechanism, and a limit switch reset system according to the first aspect above;

[0029] The hoisting transmission mechanism, the slewing transmission mechanism, and the luffing transmission mechanism are each equipped with a preset number of travel limiters. The control device is communicatively connected to the adjustment module and the micro switch module of each travel limiter.

[0030] To achieve the above objectives, in a fourth aspect, this application also provides a method for resetting a limit switch for a tower crane transmission mechanism, applied to the tower crane provided in the third aspect above, the method comprising:

[0031] The human-machine interface device allows for one-button control of the reset of the stroke limit switches corresponding to the hoisting transmission mechanism, the slewing transmission mechanism, and the luffing transmission mechanism.

[0032] As a further improvement to the above technical solution:

[0033] In conjunction with the fourth aspect, in one possible implementation, the method further includes:

[0034] The cam assembly in the stroke limiter corresponding to the upward stop limit and upward deceleration of the lifting transmission mechanism is rotated to the maximum position in the reset direction;

[0035] The cam assembly in the stroke limiter corresponding to the downward stop limit and downward deceleration limit of the lifting transmission mechanism is controlled to rotate in the reset direction to the maximum position;

[0036] The cam assembly in the stroke limiter corresponding to the left stop limit and left deceleration limit of the rotary transmission mechanism is rotated to the maximum position in the reset direction;

[0037] The cam assembly in the stroke limiter corresponding to the right stop limit and right deceleration limit of the rotary transmission mechanism is rotated to the maximum position in the reset direction;

[0038] The cam assembly in the stroke limiter corresponding to the outward stop limit and outward deceleration limit of the amplitude transmission mechanism is rotated to the maximum position in the reset direction;

[0039] The cam assembly in the stroke limiter corresponding to the inward stop limit and inward deceleration limit of the amplitude transmission mechanism is rotated to the maximum position in the reset direction.

[0040] Compared to existing technologies, the beneficial effects of this application are:

[0041] This application provides a limit switch reset system, a tower crane, and a limit switch reset method. The limit switch reset system generates and sends a one-key reset signal via a human-machine interface. The control device responds to the one-key reset signal by controlling the adjustment module to drive the cam assembly to rotate in the reset direction. Responding to the position signal emitted when the microswitch module is triggered by the cam assembly, the control module drives the cam assembly to rotate again in the calibration direction. When the microswitch module is detrimentalized, the control module stops driving, thereby stopping the cam assembly's rotation and completing the reset. This achieves automatic reset of the travel limit switch to its maximum position. Furthermore, after resetting to the maximum position, during the encoder calibration process inside the travel limit switch, the cam assembly will not be too close to the microswitch, preventing it from rotating a short distance before triggering the limit switch and stopping operation. Therefore, manual adjustment of the limit switch is eliminated, reducing labor intensity and improving work efficiency.

[0042] In addition, the limit switch reset system is applied in tower cranes. When resetting the limit switches of the tower crane's transmission mechanism, the corresponding travel limit switches of the hoisting transmission mechanism, slewing transmission mechanism, and luffing transmission mechanism can be reset with a single button press via a human-machine interface (HMI). The HMI can be installed on the ground or in the operator's room, enabling remote control. This eliminates the need for personnel to climb to the location of the transmission mechanism to remove the limit switch cover for adjustment, thus reducing manual labor intensity, improving work efficiency, and significantly reducing operational risks.

[0043] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0044] The accompanying drawings are provided to further illustrate this application and form part of the specification. They are used together with the following detailed description to explain this application. It should be understood that the following drawings only show some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0045] Figure 1 This paper shows a schematic diagram of a limiter reset system according to an embodiment of the present application;

[0046] Figure 2 This illustration shows a partial structural diagram of the interior of the travel limiter in the limiter reset system provided in this application, with the housing concealed.

[0047] Figure 3 It shows Figure 2 A magnified view of a portion of point A in the middle;

[0048] Figure 4 A flowchart illustrating a limiter reset method provided in an embodiment of this application is shown.

[0049] Explanation of reference numerals in the attached figures:

[0050] 100. Stroke limit switch; 110. Cam module; 110a. Cam assembly; 111. Cam body; 1110. Protruding stop block; 112. Cam adjusting shaft; 120. Micro switch module; 120a. Micro switch component; 130. Adjustment module; 131. Base; 1310. Drive base; 132. Drive assembly; 1320. Drive motor; 1321. Mechanical transmission mechanism; 1322. Worm gear; 1323. Drive gear; 133. Control circuit board; 140. Input shaft; 150. Encoder;

[0051] 200. Control device;

[0052] 300. Human-computer interaction devices. Detailed Implementation

[0053] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0055] In the embodiments of this application, it should be understood that the terms "inner", "outer", "clockwise", "counterclockwise", "axial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0056] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0057] Example 1

[0058] Please see Figure 1 and Figure 2 This embodiment provides a limit switch reset system, and particularly relates to a one-button reset system for a travel limit switch mechanical switch. The limit switch reset system includes a travel limit switch 100, a control device 200, and a human-machine interface device 300. The travel limit switch 100 is communicatively connected to the control device 200, and the human-machine interface device 300 is also communicatively connected to the control device 200.

[0059] Specifically, in this embodiment, the travel limiter 100 includes a housing (not shown) and a cam module 110, a micro switch module 120, and an adjustment module 130 arranged within the housing. The cam module 110 and the micro switch module 120 are in contact-sensitive engagement. The travel limiter 100 also has an input shaft 140, which can drive the cam module 110 to rotate relative to the housing.

[0060] Therefore, when the travel limiter 100 is working normally, the cam module 110 is driven to rotate through the input shaft 140. When the cam module 110 touches the sensing micro switch module 120, it indicates that the travel limiter 100 has reached the working limit travel position.

[0061] In this embodiment, a cam assembly 110a is provided in the cam module 110. The adjustment module 130 is connected to the cam assembly 110a in the cam module 110 for driving the cam assembly 110a to rotate. The micro switch module 120 can be triggered when the cam assembly 110a rotates a preset stroke.

[0062] Furthermore, the control device 200 is communicatively connected to the adjustment module 130 and the micro switch module 120, respectively.

[0063] In this embodiment, the control device 200 can be connected to the adjustment module 130 and the micro switch module 120 via wired communication, for example, via the CAN communication protocol, or via IO signals.

[0064] In some embodiments, the control device 200 may also be wirelessly connected to the adjustment module 130 and the micro switch module 120. Optionally, the wireless communication may employ a 3G module, 4G module, 5G module, Bluetooth module, or WIFI module, etc.

[0065] In this embodiment, the human-computer interaction device 300 and the control device 200 can be connected by wired communication, for example, by using the UDP communication protocol.

[0066] In some embodiments, the human-computer interaction device 300 and the control device 200 are also connected via wired communication. Optionally, wireless communication may employ a 3G module, 4G module, 5G module, Bluetooth module, or WIFI module, etc.

[0067] It should be noted that when calibrating the travel limiter 100, the cam module 110 needs to be driven to rotate in the normal operating direction (defined as the calibration direction) via the input shaft 140. This ensures that when the cam assembly 110a in the cam module 110 triggers the micro switch module 120, the corresponding transmission mechanism reaches its limit point. Therefore, to prevent the cam assembly 100a from prematurely triggering the micro switch module 120 before the corresponding transmission mechanism reaches its limit point, the cam assembly 100a must be rotated in the opposite direction of the calibration direction before calibration, resetting the cam assembly 100a to its maximum position. Thus, the opposite direction of the calibration direction is defined as the reset direction.

[0068] Therefore, when it is necessary to reset the mechanical switch in the travel limiter 100, a one-key reset signal is first sent through the human-machine interface device 300. In response to the one-key reset signal, the control device 200 controls the adjustment module 130 to drive the cam assembly 110a to rotate in the reset direction. In response to the position signal sent by the micro switch module 120 when it is triggered by the cam assembly 110a, the control device 200 controls the adjustment module 130 to drive the cam assembly 110a to rotate in the calibration direction. The rotation of the cam assembly 110a in the calibration direction will release the triggering of the micro switch module 120. Thus, when the control device 200 determines that the micro switch module 120 has been released from triggering, it controls the adjustment module 130 to stop driving. At this time, the cam assembly 110a stops rotating and stays at the maximum travel position.

[0069] Please see Figure 1 and Figure 2 In this example, the cam module 110 has multiple stacked cam assemblies 110a arranged along the rotation axis (four cam assemblies 110a are shown in the illustration of this embodiment). Each cam assembly 110a can rotate synchronously with the cam module 110 or rotate independently. Each cam assembly 110a includes a cam body 111 and a cam adjustment shaft 112 that can drive the cam body 111 to rotate. The initial position of the cam body 111 can be adjusted through the cam adjustment shaft 112. The cam body 111 and the cam adjustment shaft 112 are engaged by an internal gear ring and gear transmission. The micro switch module 120 also has micro switches 120a corresponding to the cam assemblies 110a one-to-one along the rotation axis of the cam module 110.

[0070] Furthermore, the cam body 111 is provided with a protruding stop 1110. When the protruding stop 1110 collides with the corresponding micro switch 120a, the micro switch 120a is triggered. It can be understood that the micro switch 120a is initially in a normally open state. When the protruding stop 1110 collides with the micro switch 120a, the micro switch 120a turns to a normally closed state, thereby completing the triggering of the micro switch 120a.

[0071] Please refer to the following: Figure 3 The aforementioned adjustment module 130 includes a base 131, a plurality of drive components 132 disposed on the base 131, and a control circuit board 133 disposed on the base 131 (see [link]). Figure 1 The number of drive components 132 corresponds one-to-one with the number of cam components 110a in the cam module 110.

[0072] Furthermore, the base 131 is mounted on the cam module 110 and can rotate with the cam module 110. The base 131 also has a drive seat 1310 for mounting drive components 132. Each drive component 132 is connected to the cam adjustment shaft 112 of the corresponding cam component 110a, thereby allowing the drive component 132 to drive the cam body 111 to rotate and adjust via the cam adjustment shaft 112. The control circuit board 133 is electrically connected to the drive component 132 and communicatively connected to the control device 200.

[0073] The drive assembly 132 includes a drive motor 1320 and a mechanical transmission mechanism 1321. The drive motor 1320 has a built-in reducer. The output shaft of the reducer is connected to the cam adjustment shaft 112 via the mechanical transmission mechanism 1321.

[0074] It should be noted that, considering the size of the travel limiter 100, the drive motor 1320 used in this embodiment is a small micro motor.

[0075] In this embodiment, the mechanical transmission mechanism 1321 includes a worm gear 1322 and a drive gear 1323 that mesh with each other. The worm gear 1322 is connected to the output shaft of the reducer, and the drive gear 1323 is located at the upper end of the cam adjusting shaft 112 and protrudes above the base 131. Thus, the output shaft of the reducer can drive the worm gear 1322 to rotate, the rotation of the worm gear 1322 can drive the drive gear 1323 to rotate, and the rotation of the drive gear 1323 can drive the cam adjusting shaft 112 to rotate, thereby driving the cam body 111 to rotate.

[0076] In some embodiments, the mechanical transmission mechanism 1321 may include a first bevel gear and a second bevel gear that mesh with each other. The first bevel gear is mounted on the output shaft of the reducer, and the second bevel gear is mounted on the upper end of the cam adjusting shaft 112. Thus, the output shaft of the reducer can drive the first bevel gear to rotate, the rotation of the first bevel gear can drive the second bevel gear to rotate, and the rotation of the second bevel gear can drive the cam adjusting shaft 112 to rotate, thereby driving the cam body 111 to rotate.

[0077] In other embodiments, the mechanical transmission mechanism 1321 may also be selected as belt drive, sprocket drive, or spur gear drive, etc. It should be understood that the above are merely illustrative examples and are not intended to limit the scope of protection of this application.

[0078] Understandably, in this embodiment, the drive motor 1320 can be installed vertically or horizontally depending on the different mechanical transmission mechanisms 1321. For example, if a worm gear 1322 and a drive gear 1323 are used, the drive motor 1320 can be installed horizontally to accommodate the meshing transmission of the worm gear 1322 and the drive gear 1323, resulting in a more compact structure.

[0079] The aforementioned human-computer interaction device 300 includes a display screen, which is equipped with a mechanical button and / or a virtual button for inputting a one-key reset signal. Thus, a one-key reset signal can be sent to the control device 200 via the mechanical button or the virtual button.

[0080] Furthermore, whether the cam assembly 110a in the travel limit switch 100 triggers the corresponding micro switch 120a can be displayed on the monitor, making it convenient to verify whether the one-key reset is completed.

[0081] The fault signal of the control circuit board 133 in the travel limit switch 100 can also be fed back to the control device 200 and then sent to the display via communication. The display can be used to observe whether the control circuit board 133 and the drive motor 1320 have malfunctioned, such as motor stall fault, motor wire breakage fault, abnormal communication between the control circuit board 133 and the control device 200, etc.

[0082] In this embodiment, the human-computer interaction device 300 can be placed on the ground or in the control room to prevent interference and damage caused by the external environment.

[0083] Optionally, the human-computer interaction device 300 can be a remote control with a display, a computer, or a mobile phone, etc.

[0084] Please see Figure 1 , Figure 2 and Figure 4 Furthermore, this embodiment also provides a limit switch reset method, specifically a one-button reset method for a travel limit switch mechanical switch, which includes the following steps:

[0085] S100: A one-key reset signal is sent via the human-computer interaction device 300;

[0086] S200: Drives the cam assembly 110a to rotate in the reset direction according to the one-key reset signal;

[0087] S300: When the cam assembly 110a triggers the micro switch module 120, the cam assembly 110a is driven to rotate again in the calibration direction;

[0088] S400: When the cam assembly 110a releases the trigger on the micro switch module 120, the rotation of the cam assembly 110a is stopped. This completes the reset operation.

[0089] Therefore, by using the above-mentioned limiter reset method, each cam assembly 110a can be rotated to the maximum position, at which the cam assembly 110a is just de-triggered from the micro switch 120a in the micro switch module 120.

[0090] Compared to existing technologies, the limit switch reset system and method provided in this embodiment automatically reset the travel limit switch 100 to its maximum position by adjusting the module 130. This eliminates the need for manual adjustment and reset of the limit switch. Furthermore, after resetting to the maximum position, during the calibration of the encoder 150 inside the travel limit switch 100, the cam assembly 110a will not be too close to the micro switch 120a, preventing the cam assembly 110a from triggering the limit switch and stopping after only a short rotation. This reduces manual labor intensity and improves work efficiency.

[0091] Example 2

[0092] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 This embodiment provides a tower crane (a tower crane for short). The tower crane includes a hoisting transmission mechanism, a slewing transmission mechanism, a luffing transmission mechanism, and a limit switch reset system provided according to the above embodiment one.

[0093] The hoisting transmission mechanism, slewing transmission mechanism, and luffing transmission mechanism are each equipped with a preset number of travel limiters 100. For example, in this embodiment, each of the hoisting transmission mechanism, slewing transmission mechanism, and luffing transmission mechanism is equipped with at least one travel limiter 100. The control device 200 is communicatively connected to the adjustment module 130 and microswitch module 120 of each travel limiter 100. Each travel limiter 100 is equipped with an encoder 150.

[0094] It should be noted that the control device 200 is a component in the tower crane control system, but it can also be an additional control device 200. The control device 200 can be selected as a PLC controller.

[0095] Furthermore, this embodiment also provides a method for resetting a limit switch for a tower crane transmission mechanism, applied to the aforementioned tower crane. The method for resetting a limit switch for a tower crane transmission mechanism includes:

[0096] The travel limit switches 100 of the hoisting transmission mechanism, slewing transmission mechanism and luffing transmission mechanism can be reset with one key control via the human-machine interaction device 300.

[0097] Specifically, according to regulations, when the cam module 110 rotates clockwise, it triggers the microswitch module 120 that controls the upward stop limit, upward deceleration limit, outward stop limit, outward deceleration limit, and left stop limit and left deceleration limit of the luffing transmission mechanism; when the cam module 110 rotates counterclockwise, it triggers the microswitch module 120 that controls the downward stop limit, downward deceleration limit, inward stop limit, inward deceleration limit, and right stop limit and right deceleration limit of the luffing transmission mechanism. Therefore, it can be understood that when resetting the corresponding travel limit switches 100 of the hoisting transmission mechanism, slewing transmission mechanism, and luffing transmission mechanism, it is necessary to control the cam assembly 110a in the corresponding travel limit switch 100 to rotate in the reset direction (i.e., the opposite direction of the normal operation of the cam module 110).

[0098] Therefore, the resetting of the stroke limiters 100 corresponding to the hoisting transmission mechanism, slewing transmission mechanism, and luffing transmission mechanism via the human-machine interface device 300 includes:

[0099] The cam assembly 110a in the stroke limiter 100, which controls the upward stop limit and upward deceleration of the lifting transmission mechanism, rotates to the maximum position (i.e., counterclockwise rotation) in the reset direction.

[0100] Specifically, the method for determining the maximum position is as follows:

[0101] The control device 200 sends a one-key reset command for the upward stop limit and upward deceleration limit to the control circuit board 133 via CAN communication. The control circuit board 133 then controls the drive motor 1320 to drive the cam assembly 110a to rotate counterclockwise. When the cam assembly 110a just triggers the micro switch 120a corresponding to the upward stop limit or upward deceleration limit, the control device 200 receives a position signal from the corresponding micro switch 120a and then sends a stop command to stop the drive motor 1320 from driving the cam assembly 110a. The control device 200 then sends another command, which, via the control circuit board 133, controls the drive motor 1320 to drive the cam assembly 110a to rotate clockwise. When the cam assembly 110a rotates to a point where it just does not trigger the micro switch 120a corresponding to the upward stop limit or upward deceleration limit, the control device 200 receives feedback that the position signal of the corresponding micro switch 120a has not been triggered and then sends a stop command.

[0102] At this point, the cam assembly 110a corresponding to the upward stop limit and the upward deceleration limit has rotated counterclockwise to its maximum position, just before triggering the micro switch 120a. The cam assembly 110a corresponding to the upward stop limit and the upward deceleration limit can be controlled separately or synchronously.

[0103] The cam assembly 110a in the travel limiter 100 corresponding to the downward stop limit and downward deceleration limit of the lifting transmission mechanism is rotated to the maximum position in the reset direction (i.e., clockwise rotation).

[0104] Specifically, the method for determining the maximum position is as follows:

[0105] The control device 200 sends a one-key reset command for the downward stop limit and downward deceleration limit to the control circuit board 133 via CAN communication. The control circuit board 133 then controls the drive motor 1320 to drive the cam assembly 110a to rotate clockwise. When the cam assembly 110a just triggers the micro switch 120a corresponding to the downward stop limit or downward deceleration limit, the control device 200 receives a position signal from the corresponding micro switch 120a and then sends a stop command to stop the drive motor 1320 from driving the cam assembly 110a. The control device 200 then sends another command, which, via the control circuit board 133, controls the drive motor 1320 to drive the cam assembly 110a to rotate counterclockwise. When the cam assembly 110a rotates to a point where it just does not trigger the micro switch 120a corresponding to the downward stop limit or downward deceleration limit, the control device 200 receives feedback that the position signal of the corresponding micro switch 120a has not been triggered and then sends a stop command.

[0106] At this point, the cam assembly 110a corresponding to the downward stop limit and the downward deceleration limit has rotated clockwise to its maximum position, just before triggering the micro switch 120a. The cam assembly 110a corresponding to the downward stop limit and the downward deceleration limit can be controlled separately or synchronously.

[0107] The cam assembly 110a in the stroke limiter 100 corresponding to the left stop limit and left deceleration limit of the rotary transmission mechanism is rotated to the maximum position in the reset direction (i.e., counterclockwise rotation).

[0108] Specifically, the method for determining the maximum position is as follows:

[0109] The control device 200 sends a one-key reset command for the left stop limit and the left deceleration limit to the control circuit board 133 via CAN communication. The control circuit board 133 controls the drive motor 1320 to drive the cam assembly 110a to rotate counterclockwise. When the cam assembly 110a just triggers the micro switch 120a corresponding to the left stop limit or the left deceleration limit, the control device 200 receives the corresponding position signal from the micro switch 120a and then sends a stop command to stop the drive motor 1320 from driving the cam assembly 110a. Then the control device 200 sends another command to control the drive motor 1320 to drive the cam assembly 110a clockwise via the control circuit board 133. When the cam assembly 110a just fails to trigger the corresponding micro switch 120a, the control device 200 receives feedback that the corresponding position signal of the micro switch 120a has not been triggered and then sends a stop command.

[0110] At this point, the cam assembly 110a corresponding to the left stop limit and the left deceleration limit has rotated to its maximum position in the counterclockwise direction, and just before triggering the micro switch 120a. The cam assembly 110a corresponding to the left stop limit and the left deceleration limit can be controlled to move separately or synchronously.

[0111] The cam assembly 110a in the stroke limiter 100 corresponding to the right stop limit and right deceleration limit of the rotary transmission mechanism is rotated to the maximum position in the reset direction (i.e., clockwise rotation);

[0112] Specifically, the method for determining the maximum position is as follows:

[0113] The control device 200 sends a one-key reset command for the right stop limit and right deceleration limit to the control circuit board 133 via CAN communication. The control circuit board 133 then controls the drive motor 1320 to drive the cam assembly 110a to rotate clockwise. When the cam assembly 110a just triggers the micro switch 120a corresponding to the right stop limit or right deceleration limit, the control device 200 receives a position signal from the corresponding micro switch 120a and then sends a stop command to stop the drive motor 1320 from driving the cam assembly 110a. The control device 200 then sends another command to control the drive motor 1320 to drive the cam assembly 110a to rotate counterclockwise via the control circuit board 133. When the cam assembly 110a just fails to trigger the micro switch 120a corresponding to the right stop limit or right deceleration limit, the control device 200 receives feedback that the position signal of the corresponding micro switch 120a has not been triggered and then sends a stop command.

[0114] At this point, the cam assembly 110a corresponding to the right stop limit and the right deceleration limit has rotated clockwise to its maximum position, and just before triggering the micro switch 120a. The cam assembly 110a corresponding to the right stop limit and the right deceleration limit can be controlled to move separately or synchronously.

[0115] The cam assembly 110a in the stroke limiter 100 corresponding to the outward stop limit and outward deceleration limit of the variable amplitude transmission mechanism rotates to the maximum position in the reset direction (i.e., counterclockwise rotation);

[0116] Specifically, the method for determining the maximum position is as follows:

[0117] The control device 200 sends a one-key reset command for the outward stop limit and outward deceleration limit to the control circuit board 133 via CAN communication. The control circuit board 133 controls the drive motor 1320 to drive the cam assembly 110a to rotate counterclockwise. When the cam assembly 110a just triggers the micro switch 120a corresponding to the outward stop limit or outward deceleration limit, the control device 200 receives a position signal from the corresponding micro switch 120a and then sends a stop command to stop the drive motor 1320 from driving the cam assembly 110a. Then, the control device 200 sends another command to control the drive motor 1320 to drive the cam assembly 110a clockwise via the control circuit board 133. When the cam assembly 110a just fails to trigger the micro switch 120a corresponding to the outward stop limit or outward deceleration limit, the control device 200 receives feedback that the position signal of the corresponding micro switch 120a has not been triggered and then sends a stop command.

[0118] At this point, the cam assembly 110a corresponding to the outward stop limit and the outward deceleration limit has rotated to its maximum position in the counterclockwise direction, and just before triggering the micro switch 120a. The cam assembly 110a corresponding to the outward stop limit and the outward deceleration limit can be controlled to move separately or synchronously.

[0119] The cam assembly 110a in the stroke limiter 100, which controls the inward stop limit and inward deceleration limit of the variable amplitude transmission mechanism, rotates to the maximum position (i.e., clockwise rotation) in the reset direction.

[0120] Specifically, the method for determining the maximum position is as follows:

[0121] The control device 200 sends a one-key reset command for the inward stop limit and the inward deceleration limit to the control circuit board 133 via CAN communication. The control circuit board 133 controls the drive motor 1320 to drive the cam assembly 110a to rotate clockwise. When the cam assembly 110a just triggers the micro switch 120a corresponding to the inward stop limit or the inward deceleration limit, the control device 200 receives a position signal from the corresponding micro switch 120a and then sends a stop command to stop the drive motor 1320 from driving the cam assembly 110a. Then, the control device 200 sends another command to control the drive motor 1320 to drive the cam assembly 110a to rotate counterclockwise via the control circuit board 133. When the cam assembly 110a just fails to trigger the micro switch 120a corresponding to the inward stop limit or the inward deceleration limit, the control device 200 receives feedback that the position signal of the corresponding micro switch 120a has not been triggered and then sends a stop command.

[0122] At this point, the cam assembly 110a corresponding to the inward stop limit and the inward deceleration limit has rotated clockwise to its maximum position, just before triggering the micro switch 120a. The cam assembly 110a corresponding to the inward stop limit and the inward deceleration limit can be controlled separately or synchronously.

[0123] Therefore, when resetting the limit switches of the tower crane's transmission mechanism, the corresponding travel limit switches 100 of the hoisting transmission mechanism, slewing transmission mechanism, and luffing transmission mechanism can be reset with a single button press via the human-machine interface device 300, facilitating subsequent calibration of the encoder 150. The human-machine interface device 300 can be installed on the ground or in the operator's room, enabling remote control. This eliminates the need for personnel to climb to the location of the transmission mechanism to remove the limit switch cover for adjustment, thus resetting the limit switches of the tower crane's transmission mechanism, reducing manual labor intensity, improving work efficiency, and significantly reducing operational risks.

[0124] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0125] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0126] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0127] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A limit switch reset system, characterized in that, include: The travel limiter (100) includes a housing and a cam module (110), a micro switch module (120), and an adjustment module (130) arranged within the housing. The adjustment module (130) is used to drive the cam assembly (110a) in the cam module (110) to rotate. The adjustment module (130) includes a base (131), a control circuit board (133), and a drive assembly (132) disposed on the base (131). The base (131) is disposed on the cam module (110) and can rotate with the cam module (110). The drive assembly (132) is drivenly connected to the cam adjustment shaft (112) of the corresponding cam assembly (110a) in the cam module (110). The control circuit board (133) is electrically connected to the drive assembly (132). The cam assembly (110a) is used to trigger the micro switch module (120). Human-computer interaction device (300), used to generate and send a one-key reset signal; and The control device (200) is communicatively connected to the control circuit board (133) and configured to: In response to the one-key reset signal, the adjustment module (130) is controlled to drive the cam assembly (110a) to rotate in the reset direction; In response to the position signal emitted when the micro switch module (120) is triggered by the cam assembly (110a), the adjustment module (130) is controlled to drive the cam assembly (110a) to rotate again in the calibrated direction; When it is determined that the micro switch module (120) is detrimentalized, the adjustment module (130) is controlled to stop driving.

2. The limit switch reset system according to claim 1, characterized in that, The adjustment module (130) includes a plurality of drive components (132) disposed on the base (131).

3. The limit switch reset system according to claim 2, characterized in that, The driving component (132) includes: Drive motor (1320), with built-in reducer; and The mechanical transmission mechanism (1321) is connected to the output shaft of the reducer and the cam adjustment shaft (112) respectively.

4. The limit switch reset system according to claim 1, characterized in that, The control device (200) communicates with the adjustment module (130) and the micro switch module (120) via wired or wireless communication.

5. The limit switch reset system according to claim 1, characterized in that, The human-computer interaction device (300) and the control device (200) communicate via wired or wireless means.

6. The limiter reset system according to claim 1 or 5, characterized in that, The human-computer interaction device (300) includes a display screen, on which a mechanical button and / or a virtual button are provided for inputting the one-key reset signal.

7. A method for resetting a limit switch, characterized in that, The limiter reset system according to any one of claims 1-6 is applied, and the limiter reset method includes: A one-key reset signal is issued through the human-computer interaction device (300); The cam assembly (110a) is driven to rotate in the reset direction according to the one-key reset signal; When the cam assembly (110a) triggers the micro switch module (120), the cam assembly (110a) is driven to rotate again in the calibration direction; When the cam assembly (110a) releases the trigger on the micro switch module (120), the rotation of the cam assembly (110a) is stopped.

8. A tower crane, characterized in that, Includes a hoisting transmission mechanism, a slewing transmission mechanism, a luffing transmission mechanism, and a limiter reset system according to any one of claims 1-6; The hoisting transmission mechanism, the slewing transmission mechanism and the luffing transmission mechanism are each provided with a preset number of travel limiters (100), and the control device (200) is communicatively connected to the adjustment module (130) and the micro switch module (120) of each travel limiter (100).

9. A method for resetting a limit switch for a tower crane transmission mechanism, characterized in that, Applied to the tower crane according to claim 8, the method includes: The human-machine interface device (300) can be used to control the reset of the travel limiters (100) corresponding to the hoisting transmission mechanism, the slewing transmission mechanism and the luffing transmission mechanism with a single key.

10. The method for resetting the limit switch for the tower crane transmission mechanism according to claim 9, characterized in that, The method further includes: The cam assembly (110a) in the stroke limiter (100) corresponding to the upward stop limit and upward deceleration of the lifting transmission mechanism is rotated to the maximum position in the reset direction; The cam assembly (110a) in the stroke limiter (100) corresponding to the downward stop limit and downward deceleration limit of the lifting transmission mechanism is controlled to rotate to the maximum position in the reset direction; The cam assembly (110a) in the stroke limiter (100) corresponding to the left stop limit and left deceleration limit of the rotary transmission mechanism is rotated to the maximum position in the reset direction; The cam assembly (110a) in the stroke limiter (100) corresponding to the right stop limit and right deceleration limit of the rotary transmission mechanism is rotated to the maximum position in the reset direction; The cam assembly (110a) in the stroke limiter (100) corresponding to the outward stop limit and outward deceleration limit of the amplitude transmission mechanism is rotated to the maximum position in the reset direction; The cam assembly (110a) in the stroke limiter (100) corresponding to the inward stop limit and inward deceleration limit of the variable amplitude transmission mechanism is rotated to the maximum position in the reset direction.

Images