Grid transmission over-torque protection device and method

Abstract

The invention relates to a grid transmission over-torque protection device and method, a driven chain wheel of the device is sleeved on a chain wheel sleeve, the driven chain wheel and the chain wheel sleeve are concentrically arranged, and a shear pin is connected with the driven chain wheel and the chain wheel sleeve; the touch rod is connected to the driven chain wheel, the rotating shaft is connected to the chain wheel sleeve and is arranged away from the axis of the chain wheel sleeve, and the rotating shaft is parallel to the touch rod; the detection rod is arranged on the rotating shaft and is configured to rotate around the rotating shaft to be converted into a second state from a first state when being subjected to external force; in the first state, the first end of the detection rod is located on the moving track of the touch rod, and the second end of the detection rod shields the axis of the chain wheel sleeve. In the second state, the first end of the detection rod abuts against the touch rod, and the second end of the detection rod deviates from the axis of the chain wheel sleeve. The proximity switch is farther away from the chain wheel sleeve relative to the detection rod and faces the axis of the chain wheel sleeve. The device can detect over-twisting in time and cut off power transmission in time when over-twisting occurs.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and in particular to a grille transmission over-torque protection device and method. Background Art

[0002] The most commonly used pretreatment process in the field of sewage treatment is the automatic sewage interception mechanical screen. Sewage treatment faces various complex working conditions, and the requirements for equipment are getting higher and higher. In order to avoid equipment damage caused by sudden working conditions, it is necessary to install an over-torque protection device on the equipment. There are many types of screens, and the installation form of the drive reducer is also the same in design. At present, the most common installation method is the shaft-mounted type on the side of the equipment and the horizontal installation of the coaxial reducer on the top of the equipment. Various installation methods also have their shortcomings: (1) The drive adopts a shaft-mounted reducer, and the reducer reversing arm can be used to design over-torque protection, but the shaft-mounted reducer equipment occupies a large space and is not suitable for some occasions; (2) The shaft-mounted installation adopts no sprocket chain to transmit deceleration, which is not suitable for low-speed equipment; (3) The bottom installation method is adopted, such as the rotary hook rake screen, which transmits torque through the sprocket chain, and there is no way to design a reversing arm for over-torque protection; (4) The use of other finished torque protection devices on the market takes up a large space for installation and is costly; (5) At present, in order to reduce production costs, the rotary hook rake screen is generally not equipped with an over-torque protection device. Summary of the invention

[0003] In view of the deficiencies in the prior art, a first object of the present invention is to provide a grille transmission over-torque protection device, which can timely detect the occurrence of over-torque and promptly cut off power transmission when over-torque occurs.

[0004] A second object of the present invention is to provide a grid transmission over-torque protection method, which can better protect the equipment during over-torque.

[0005] To achieve the first object of the present invention, the present invention provides a grille transmission over-torque protection device, which includes a driven sprocket, a sprocket sleeve, a touch rod, a rotating shaft, a detection rod, a shear pin and a proximity switch; the driven sprocket sleeve is arranged on the sprocket sleeve, the driven sprocket and the sprocket sleeve are arranged concentrically, and the shear pin connects the driven sprocket and the sprocket sleeve; the touch rod is connected to the driven sprocket, the rotating shaft is connected to the sprocket sleeve and is arranged away from the axis of the sprocket sleeve, and the rotating shaft and the touch rod are parallel to each other; the detection rod is arranged on the driven sprocket sleeve, the driven sprocket and the sprocket sleeve are arranged concentrically, and the shear pin connects the driven sprocket and the sprocket sleeve; the touch rod is connected to the driven sprocket, the rotating shaft is connected to the sprocket sleeve and is arranged away from the axis of the sprocket sleeve, and the rotating shaft and the touch rod are parallel to each other; A measuring rod is arranged on the rotating shaft, and the detecting rod is configured to rotate around the rotating shaft and change from a first state to a second state when subjected to external force; in the first state, the first end of the detecting rod is located on the moving trajectory of the touch rod, and the second end of the detecting rod blocks the axis of the sprocket sleeve; in the second state, the first end of the detecting rod abuts against the touch rod, and the second end of the detecting rod deviates from the axis of the sprocket sleeve; the proximity switch is farther away from the sprocket sleeve than the detecting rod, and the proximity switch is toward the axis of the sprocket sleeve.

[0006] In some embodiments of the present invention, the detection rod includes a rod body, a sleeve and a detection plate, the sleeve is arranged on the middle side of the rod body, the sleeve is sleeved on the rotating shaft, the detection plate is arranged at the end of the rod body, the radial size of the detection plate in the rod body is larger than the diameter of the rod body, and the detection plate constitutes the second end of the detection rod.

[0007] In some embodiments of the present invention, a distance from the rotating shaft to a moving track of the touch rod is smaller than a distance from the rotating shaft to an axis of the rotating shaft hub.

[0008] In some embodiments of the present invention, in the first state, the first end of the detection rod is located downstream of the touch rod in the rotation direction of the driven sprocket, and the touch rod is in contact with the first end of the detection rod or the touch rod is close to the detection rod.

[0009] In some embodiments of the present invention, the first end of the detection rod exceeds the moving track of the touch rod in a direction away from the axis of the sprocket sleeve.

[0010] In some embodiments of the present invention, the grille transmission over-torque protection device also includes a shell and a support, the sprocket sleeve is rotatably connected to the shell, the support is connected to the shell and extends to the axial outside of the sprocket sleeve, and the proximity switch is connected to the support.

[0011] In some embodiments of the present invention, the rotating shaft and the touch rod are respectively parallel to the axis of the sprocket sleeve.

[0012] In some embodiments of the present invention, the detection rod is interference fit with the rotating shaft; or, the detection rod is rotatably fit with the rotating shaft, and the grid transmission over-torque protection device also includes a tightening mechanism, which is arranged between the detection rod and the sprocket sleeve or between the detection rod and the rotating shaft.

[0013] To achieve the second purpose of the present invention, the present invention also provides a grille transmission over-torque protection method, the grille transmission over-torque protection method is based on a grille transmission over-torque protection device described in any of the above-mentioned schemes, the grille transmission over-torque protection device also includes a driving member, a driving sprocket and a chain, the driving member is connected to the driving sprocket, and the chain is arranged around the driving sprocket and the driven sprocket; the grille transmission over-torque protection method includes performing the following steps: based on the proximity switch detecting that the second end of the detection rod is away from the proximity switch, stopping the operation of the driving member.

[0014] In some embodiments of the present invention, the grille transmission over-torque protection device further includes an alarm, and the grille transmission over-torque protection method further includes: based on the proximity switch detecting that the second end of the detection rod is away from the proximity switch, the alarm sends an alarm signal.

[0015] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0016] The grille transmission over-torque protection device of the present invention connects the driven sprocket and the sprocket sleeve through a shear pin. When over-torque occurs, the shear pin cuts off the transmission between the two to achieve the purpose of over-torque protection. At the same time, the touch rod installed on the driven sprocket rotates with the driven sprocket and touches the detection rod, so that the detection rod rotates around the rotating shaft. The end of the detection rod leaves the axial position of the sprocket sleeve, and the proximity switch can detect the occurrence of over-torque. It can be seen that the grille transmission over-torque protection device of the present invention can cut off power transmission when over-torque occurs, detect over-torque in time, protect the equipment, and provide convenience for subsequent maintenance, reducing production losses caused by equipment failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the main structure of the grille transmission over-torque protection device embodiment of the present invention during normal operation.

[0018] Figure 2 It is a schematic diagram of the main structure of the embodiment of the grille transmission over-torque protection device of the present invention when over-torque occurs.

[0019] Figure 3 It is a side structural schematic diagram of an embodiment of the grille transmission over-torque protection device of the present invention during normal operation.

[0020] In the figure, 10-driven sprocket, 20-sprocket sleeve, 30-touch rod, 31-moving track, 40-rotating shaft, 50-detection rod, 51-rod body, 52-sleeve, 53-detection plate, 60-shear pin, 70-proximity switch, 80-housing, 90-support, 100-driving member, 110-driving sprocket, 120-chain.

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation modes. DETAILED DESCRIPTION

[0022] like Figures 1 to 3 As shown, an embodiment of the present invention provides a grille transmission over-torque protection device, which is a transmission over-torque protection device used in the field of sewage treatment, and in particular, an over-torque protection device used in a rotary hook-rake grille machine. It mainly aims at the problem that the rotary hook-rake grille machine in the prior art has no over-torque protection, and provides a low-cost over-torque protection device. The grille transmission over-torque protection device of this embodiment is used for a rotary hook-rake grille machine, and is specifically arranged at the grille transmission part of the rotary hook-rake grille machine. This embodiment also provides a rotary hook-rake grille machine with the grille transmission over-torque protection device, and the rotary hook-rake grille machine has a grille, which is connected to the grille transmission over-torque protection device and driven to rotate by the grille transmission over-torque protection device.

[0023] Specifically, the grille transmission over-torque protection device of this embodiment mainly includes a driven sprocket 10, a sprocket sleeve 20, a touch rod 30, a rotating shaft 40, a detection rod 50, a shear pin 60 and a proximity switch 70. Among them, the driven sprocket 10 is used to connect with the driving mechanism and is driven to rotate by the driving mechanism, and the sprocket sleeve 20 is used to connect with the grille main shaft, thereby driving the grille main shaft to rotate. The sprocket sleeve 20 and the grille main shaft can be connected by a flat key, for example. The driven sprocket 10 and the sprocket sleeve 20 are both components that drive the grille main shaft of the rotary hook-rake grille machine to rotate.

[0024] Among them, the driven sprocket 10 is sleeved on the sprocket sleeve 20, the driven sprocket 10 and the sprocket sleeve 20 are concentrically arranged, and the shear pin 60 connects the driven sprocket 10 and the sprocket sleeve 20, thereby realizing the circumferential linkage of the driven sprocket 10 and the sprocket sleeve 20, and transmitting the rotation of the driven sprocket 10 to the sprocket sleeve 20, and the sprocket sleeve 20 then transmits the rotation to the grille main shaft of the rotary hook and rake grille machine, thereby driving the grille of the rotary hook and rake grille machine to rotate.

[0025] The touch rod 30 is connected to the driven sprocket 10. For example, to avoid affecting the cooperation between the driven sprocket 10 and other transmission mechanisms, the touch rod 30 can be set on the side of the disc of the driven sprocket 10. The touch rod 30 can be a round rod. The touch rod 30 can be connected to the drive sprocket 10 of the existing rotary hook rake type screen machine through threaded fasteners such as screws or bolts, which is convenient for retrofitting existing equipment.

[0026] The rotating shaft 40 is connected to the sprocket sleeve 20. For example, in order to avoid affecting the coordination between the sprocket sleeve 20 and the grille main shaft and other parts of the rotary hook-rake grille machine, the rotating shaft 40 can be set on the side of the sprocket sleeve 20. The rotating shaft 40 is set away from the axis of the sprocket sleeve 20, and the rotating shaft 40 will not block the axis of the sprocket sleeve 20. The axis of the sprocket sleeve 20 is the rotation center of the sprocket sleeve 20. The rotating shaft 40 and the touch rod 30 are parallel to each other, for example, the center line of the rotating shaft 40 and the center line of the touch rod 30 are parallel to each other, so that the parts rotating around the rotating shaft 40 can maintain a constant distance or contact with the touch rod 30 in the direction of the center line of the rotating shaft 40 when they rotate to any position.

[0027] The detection rod 50 is disposed on the rotating shaft 40, and the detection rod 50 is configured to rotate around the rotating shaft 40 and change from a first state to a second state when subjected to an external force. The detection rod 50 can be installed on the rotating shaft 40 and locked with an appropriate torque to keep the detection rod 50 from rotating around the rotating shaft 40 in a normal operating state, and only rotate around the rotating shaft 40 when pushed by an external force.

[0028] In the first state, the first end of the detection rod 50 is located on the moving track 31 of the touch rod 30, and the second end of the detection rod 50 blocks the axis of the sprocket sleeve 20. The first state is the state when the detection rod 50 is not subjected to external force, that is, the state of the grid transmission over-torque protection device when the equipment is working normally. In the first state, the sprocket sleeve 20 and the driven sprocket 10 rotate synchronously in the circumferential direction, the touch rod 30 rotates with the driven sprocket 10, and the detection rod 50 rotates with the sprocket sleeve 20. Although the first end of the detection rod 50 is located on the moving track 31 of the touch rod 30, the touch rod 30 rotates synchronously with the first end of the detection rod 50, and the touch rod 30 does not press against the detection rod 50. At this time, the second end of the detection rod 50 remains blocked at the axis position of the sprocket sleeve 20. The moving track 31 of the touch rod 30 can refer to the moving track of the center of the touch rod 30, and the moving track is circular at this time. The moving track 31 of the touch rod 30 can refer to the moving track of the entire touch rod 30, and the moving track is annular at this time. It only needs that the first end of the detection rod 50 is located at any position of the circle or ring.

[0029] In the second state, the first end of the detection rod 50 abuts against the touch rod 30, and the detection rod 50 is subjected to the pressure of the touch rod 30. The pressure of the touch rod 30 is an additional force, i.e., an external force. The touch rod 30 pushes the first end of the detection rod 50 to move, so that the detection rod 50 rotates around the axis of the sprocket sleeve 20, so that the second end of the detection rod 50 deviates from the axis of the sprocket sleeve 20. The second state is the state of overtorque, at which time the shear pin 60 between the driven sprocket 10 and the sprocket sleeve 20 is cut off, and the driven sprocket 10 continues to rotate under the action of the driving mechanism, but the sprocket sleeve 20 connected to the main shaft of the grid does not rotate synchronously with the driven sprocket 10, and the sprocket sleeve 20 and the driven sprocket 10 have a relative motion, so the touch rod 30 will apply an external force to the detection rod 50, so that the second end of the detection rod 50 is displaced. The second state can be dynamic, and can be the process in which the touch rod 30 pushes the first end of the detection rod 50 to move.

[0030] The proximity switch 70 is further away from the sprocket sleeve 20 than the detection rod 50, and the proximity switch 70 faces the axis of the sprocket sleeve 20. When the detection rod 50 is in the first state, the second end of the detection rod 50 is close to the proximity switch 70, and the distance between the second end of the detection rod 50 and the proximity switch 70 reaches the operating distance of the proximity switch 70, and the proximity switch 70 can form a first signal. When the detection rod 50 is in the second state, the second end of the detection rod 50 is away from the axis of the sprocket sleeve 20, that is, away from the proximity switch 70, and the distance between the second end of the detection rod 50 and the proximity switch 70 does not reach the operating distance of the proximity switch 70, and the proximity switch 70 can form a second signal. The first signal and the second signal can be electrical signals, and the first signal is different from the second signal. Therefore, the proximity switch 70 can detect whether the detection rod 50 is close to or away from the axis of the sprocket sleeve 20, and then detect the occurrence of over-torque. The proximity switch 70 can be an existing proximity switch 70, and the second end of the detection rod 50 does not need to generate pressure on the proximity switch 70. As long as the second end of the detection rod 50 is close to the proximity switch 70, the proximity switch 70 can be triggered to operate.

[0031] In this embodiment, the driven sprocket 10 is a key power transmission element on the device. The driven sprocket 10 and the sprocket sleeve 20 are connected by a high-precision shear pin 60 to transmit the torque to the grid main shaft. Based on the over-torque protection of the shear pin 60, this embodiment adds the function of automatic and timely over-torque detection, and realizes over-torque detection by using the principle that each moving part moves synchronously and the axis remains unchanged when the device is running normally, and the relative movement is dislocated when over-torque occurs.

[0032] When an over-torque failure occurs in the equipment, it is convenient for maintenance personnel to receive over-torque information in a timely manner, which is conducive to timely inspection and maintenance of the equipment, reducing production losses caused by equipment failure.

[0033] This embodiment can keep the structure of the original equipment, such as a rotary hook-rake grille machine, basically unchanged, and add components for over-torque protection and over-torque detection without affecting the installation space of the original equipment. The entire device has a simple structure, low production cost, and strong practicality.

[0034] In some examples, the detection rod 50 includes a rod body 51, a sleeve 52 and a detection plate 53. The sleeve 52 is disposed on one side of the middle of the rod body 51, and the sleeve 52 is sleeved on the rotating shaft 40. The sleeve 52 can rotate relative to the rotating shaft 40 under the action of an external force. The first end of the detection rod 50 and the second end of the detection rod 50 are respectively located on both sides of the sleeve 52 or the rotating shaft 40, and the rotating shaft 40 serves as a fulcrum for the rotation of the rod body 51. The detection plate 53 is arranged at the end of the rod body 51. The radial dimension of the detection plate 53 of the rod body 51 is larger than the diameter of the rod body 51. The detection plate 53 constitutes the second end of the detection rod 50. By setting a larger detection plate 53, the detection plate 53 has a flat surface, and the proximity switch 70 can better sense the approach of the detection plate 53 and trigger the action. Moreover, the detection plate 53 has a larger area, which is also conducive to maintaining the stability of the system. When the detection rod 50 is slightly offset due to machine vibration and other reasons, the detection plate 53 can still block the axis of the sprocket sleeve 20, and the detection plate 53 can still be located at the proximity sensing distance of the proximity switch 70 to avoid misdetection of over-torque. In the first state, the center of the detection plate 53 can be directly opposite to the axis position of the driven sprocket 10.

[0035] In some examples, the distance from the rotating shaft 40 to the moving trajectory 31 of the touch rod 30 is smaller than the distance from the rotating shaft 40 to the axis of the rotating shaft 40 wheel sleeve. The force exerted by the touch rod 30 on the detection rod 50 causes a smaller displacement of the first end of the detection rod 50, which can cause a larger displacement of the second end of the detection rod 50 and move away from the proximity switch 70, which is beneficial to improving the sensitivity of over-torque detection.

[0036] In some examples, in the first state, the first end of the detection rod 50 is located downstream of the touch rod 30 in the rotation direction of the driven sprocket 10, and the touch rod 30 is in contact with the first end of the detection rod 50 or the touch rod 30 is arranged close to the detection rod 50, so that the touch rod 30 can be pressed toward the first end of the detection rod 50 more quickly when over-torque occurs, thereby detecting over-torque more timely. In the first state, when the touch rod 30 is in contact with the first end of the detection rod 50, the touch rod 30 is in contact with the detection rod 50 without generating pressure, or the touch rod 30 is in contact with the detection rod 50 and has pressure, but the pressure does not belong to the additional force, i.e., external force, described in this embodiment, and the detection rod 50 can withstand the pressure without rotating. In the first state, when the touch rod 30 and the detection rod 50 are close to each other, the distance between the touch rod 30 and the detection rod 50 corresponds to the central angle of the axis of the sprocket sleeve 20, that is, the angle between the line connecting the center of the touch rod 30 and the axis of the sprocket sleeve 20 and the line connecting the center of the detection rod 50 and the axis of the sprocket sleeve 20 can be greater than 0 and less than or equal to 180°, for example, greater than 0 and less than or equal to 90°, for example, greater than 0 and less than or equal to 45°, for example, greater than 0 and less than or equal to 30°.

[0037] In some examples, the first end of the detection rod 50 exceeds the moving trajectory 31 of the touch rod 30 in the direction away from the axis of the sprocket sleeve 20. Since the touch rod 30 rotates around the axis of the sprocket sleeve 20, the first end of the detection rod 50 rotates around the rotating shaft 40. After the touch rod 30 presses against the first end of the detection rod 50, the first end of the detection rod 50 will gradually rotate to a position away from the touch rod 30. The longer the length of the first end of the detection rod 50 extending in the direction away from the axis of the sprocket sleeve 20, the longer the time that the touch rod 30 presses against the first end of the detection rod 50 in the second state, and the greater the distance the second end of the detection rod 50 moves, which is conducive to detection.

[0038] In some examples, the grid transmission over-torque protection device further includes a housing 80 and a support 90, the sprocket sleeve 20 is rotatably connected to the housing 80, the driven sprocket 10 sleeved on the sprocket sleeve 20 may also be located in the housing 80, and the housing 80 may be a housing for accommodating a driving mechanism. The support 90 is connected to the housing 80 and extends to the axial outer side of the sprocket sleeve 20, and the proximity switch 70 is connected to the support 90 to facilitate the positioning and installation of the proximity switch 70.

[0039] In some examples, the rotating shaft 40 and the touch rod 30 are respectively parallel to the axis of the sprocket sleeve 20, the touch rod 30 is arranged on the side of the driven sprocket 10, and the rotating shaft 40 is arranged on the side of the sprocket sleeve 20, which does not affect the movement of the driven sprocket 10 and the rotating shaft 40, and is convenient for the rotating shaft 40 and the touch rod 30 to be installed on the driven sprocket 10 and the sprocket sleeve 20 of the existing equipment. The touch rod 30 can be a shorter round rod, which is installed on the outer ring of the driven sprocket 10 and rotates with the driven sprocket 10. The rotating shaft 40 can also be a shorter round rod, which is installed on the outer ring of the sprocket sleeve 20 and rotates with the sprocket sleeve 20.

[0040] In some examples, the detection rod 50 and the rotating shaft 40 are interference fit, and the rotating shaft 40 has a tightening force on the detection rod 50, so that the detection rod 50 cannot rotate around the rotating shaft 40 when not subjected to external force, and can rotate around the rotating shaft 40 only when subjected to external force.

[0041] In other examples, the detection rod 50 is rotatably matched with the rotating shaft 40, and the grid transmission over-torque protection device also includes a tightening mechanism, which is arranged between the detection rod 50 and the sprocket sleeve 20 or between the detection rod 50 and the rotating shaft 40, so that in the first state, that is, when the detection rod 50 is not subjected to external force, the detection rod 50 and the rotating shaft 40 do not rotate relative to each other. The tightening mechanism can be, for example, a torsion spring, one end of which abuts against the sprocket sleeve 20 or the rotating shaft 40, and the other end of which abuts against the non-rotation center position of the detection rod 50. The tightening mechanism can be, for example, a tension spring, one end of which is connected to the sprocket sleeve 20 or the rotating shaft 40, and the other end of which is connected to the non-rotation center position of the detection rod 50. Of course, the function of rotating between the detection rod 50 and the rotating shaft 40 under the action of external force can also be achieved by other structures.

[0042] The present embodiment also provides a grille transmission over-torque protection method, which is based on the above-mentioned grille transmission over-torque protection device, and the grille transmission over-torque protection device also includes a driving member 100, a driving sprocket 110 and a chain 120. The driving member 100 is connected to the driving sprocket 110, and the chain 120 is arranged around the driving sprocket 110 and the driven sprocket 10. The driving member 100 can be, for example, a reduction motor, and the chain 120 can be, for example, a roller chain. The driving member 100, the driving sprocket 110, the chain 120 and the driven sprocket 10 can be necessary components on the original equipment, and the output end of the driving member 100 transmits power to the driven sprocket 10 through the chain 120.

[0043] The grid transmission over-torque protection method includes the following steps: based on the proximity switch 70 detecting that the second end of the detection rod 50 is away from the proximity switch 70, the driving member 100 is stopped. That is, when over-torque is detected, the driving member 100, such as a motor, is stopped, so as to better protect the driving member 100 and the equipment.

[0044] In some examples, the proximity switch 70 can be electrically connected to the drive member 100 or communicated via wireless signal transmission, and the signal of the proximity switch 70 is transmitted to the drive member 100 via wires or wireless signals. The grille transmission over-torque protection device can also include a controller, such as a PLC, which is electrically connected or communicated to the proximity switch 70 and the drive member 100, respectively, and the controller is used to control the start and stop of the drive member 100 based on the signal sent by the proximity switch 70.

[0045] In some examples, the grille transmission over-torque protection device further includes an alarm, which can emit sound, light, or display a mark, etc., thereby issuing an alarm signal. The alarm can be arranged on the proximity switch 70, on the housing 80, or on the control box of the original device. The alarm can be electrically connected or communicatively connected to the proximity switch 70.

[0046] The grid transmission over-torque protection method also includes: based on the proximity switch 70 detecting that the second end of the detection rod 50 deviates from the axis of the sprocket sleeve 20, the alarm sends an alarm signal to promptly inform the operator of the over-torque, which is convenient for equipment maintenance and smooth progress of the process.

[0047] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grille transmission over-torque protection device, characterized in that The invention comprises a driven sprocket, a sprocket sleeve, a touch rod, a rotating shaft, a detection rod, a shear pin and a proximity switch; the driven sprocket sleeve is arranged on the sprocket sleeve, the driven sprocket and the sprocket sleeve are arranged concentrically, and the shear pin connects the driven sprocket and the sprocket sleeve; the touch rod is connected to the driven sprocket, the rotating shaft is connected to the sprocket sleeve and is arranged away from the axis of the sprocket sleeve, and the rotating shaft and the touch rod are parallel to each other; the detection rod is arranged on the rotating shaft, and the detection rod is configured to rotate around the rotating shaft from a first state to a second state when subjected to an external force; in the first state, the first end of the detection rod is located on the moving track of the touch rod, and the second end of the detection rod blocks the axis of the sprocket sleeve; in the second state, the first end of the detection rod abuts against the touch rod, and the second end of the detection rod deviates from the axis of the sprocket sleeve; the proximity switch is farther away from the sprocket sleeve than the detection rod, and the proximity switch faces the axis of the sprocket sleeve.

2. A grille transmission over-torque protection device according to claim 1, characterized in that The detection rod includes a rod body, a sleeve and a detection plate. The sleeve is arranged on the middle side of the rod body, the sleeve is sleeved on the rotating shaft, the detection plate is arranged at the end of the rod body, the radial size of the detection plate in the rod body is larger than the diameter of the rod body, and the detection plate constitutes the second end of the detection rod.

3. A grille transmission over-torque protection device according to claim 1 or 2, characterized in that The distance from the rotating shaft to the moving track of the touch rod is smaller than the distance from the rotating shaft to the axis center of the rotating shaft wheel sleeve.

4. A grille transmission over-torque protection device according to claim 1 or 2, characterized in that In the first state, the first end of the detection rod is located downstream of the touch rod in the rotation direction of the driven sprocket, and the touch rod is in contact with the first end of the detection rod or the touch rod is arranged close to the detection rod.

5. A grille transmission over-torque protection device according to claim 1 or 2, characterized in that The first end of the detection rod exceeds the moving track of the touch rod in a direction away from the axis of the sprocket sleeve.

6. A grille transmission over-torque protection device according to claim 1 or 2, characterized in that It also includes a shell and a support, the sprocket sleeve is rotatably connected to the shell, the support is connected to the shell and extends to the axial outside of the sprocket sleeve, and the proximity switch is connected to the support.

7. A grille transmission over-torque protection device according to claim 1 or 2, characterized in that The rotating shaft and the touch rod are respectively parallel to the axis of the sprocket sleeve.

8. A grille transmission over-torque protection device according to claim 1 or 2, characterized in that The detection rod is interference fit with the rotating shaft; or, the detection rod is rotatably matched with the rotating shaft, and the grid transmission over-torque protection device also includes a tightening mechanism, which is arranged between the detection rod and the sprocket sleeve or between the detection rod and the rotating shaft.

9. A grid transmission over-torque protection method, characterized in that The grille transmission over-torque protection method is based on a grille transmission over-torque protection device according to any one of claims 1 to 8, wherein the grille transmission over-torque protection device further comprises a driving member, a driving sprocket and a chain, wherein the driving member is connected to the driving sprocket, and the chain is arranged around the driving sprocket and the driven sprocket; the grille transmission over-torque protection method comprises performing the following steps: Based on the proximity switch detecting that the second end of the detection rod is away from the proximity switch, the driving member stops working.

10. A grid transmission over-torque protection method according to claim 9, characterized in that The grille transmission over-torque protection device further includes an alarm, and the grille transmission over-torque protection method further includes: Based on the proximity switch detecting that the second end of the detection rod is away from the proximity switch, the alarm device sends an alarm signal.

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