Grid transmission over-torsion protection device

Abstract

The utility model relates to a grating transmission over-torsion protection device, which is characterized in that 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 utility model relates to the field of sewage treatment, in particular to a grille transmission over-torque protection device. 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. The most common installation method is the side shaft mounting 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) When the drive uses a shaft-mounted reducer, the reducer reversing arm can be used to design over-torque protection, but the shaft-mounted reducer equipment takes up a large space and is not suitable for some occasions; (2) When the shaft-mounted installation is used, there is no sprocket chain to transmit deceleration, which is not suitable for low-speed equipment; (3) When the bottom installation method is used, such as the rotary hook rake screen, the torque is transmitted through the sprocket chain, and there is no way to design a reversing arm for over-torque protection; (4) When using other ready-made torque protection devices on the market, the installation takes up a large space and is expensive; (5) At present, in order to reduce production costs, the rotary hook rake screen is generally not equipped with an over-torque protection device. Utility Model Content

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

[0004] To achieve the purpose 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 concentrically arranged, 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 The detection rod is arranged on the rotating shaft, and the detection 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 detection rod is located on the moving trajectory 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 is in contact with 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 is toward the axis of the sprocket sleeve.

[0005] 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.

[0006] In some embodiments of the present invention, a distance from the rotating shaft to the moving track of the touch rod is smaller than a distance from the rotating shaft to the axis of the rotating shaft hub.

[0007] 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 arranged close to the detection rod.

[0008] In some embodiments of the present invention, the first end of the detection rod exceeds the moving trajectory of the touch rod in a direction away from the axis of the sprocket sleeve.

[0009] 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.

[0010] In some embodiments of the present invention, the rotating shaft and the touch rod are respectively parallel to the axis of the sprocket sleeve.

[0011] In some embodiments of the present invention, the detection rod is interference fit with the rotating shaft; or, the detection rod is rotatably fitted 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.

[0012] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0013] The grid transmission over-torque protection device of the present invention connects the driven sprocket and the sprocket sleeve via a shear pin. When over-torque occurs, the shear pin cuts off the transmission between the two, achieving 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, causing the detection rod to rotate 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 grid transmission over-torque protection device of the present invention can cut off power transmission when over-torque occurs, detect the occurrence of over-torque in a timely manner, protect the equipment, and facilitate subsequent maintenance, reducing production losses caused by equipment failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the embodiment of the grid transmission over-torque protection device of the present invention during normal operation.

[0015] Figure 2 It is a schematic diagram of the main structure of the embodiment of the grid transmission over-torque protection device of the present utility model when over-torque occurs.

[0016] Figure 3 The figure is a side structural diagram of an embodiment of the grid transmission over-torque protection device of the utility model during normal operation.

[0017] 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.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0019] like Figures 1 to 3 As shown, an embodiment of the present invention provides a screen transmission over-torque protection device, which is a transmission over-torque protection device used in the field of sewage treatment, and is particularly a over-torque protection device for use in rotary hook-rake screen machines. It mainly addresses the problem of rotary hook-rake screen machines lacking over-torque protection in the prior art and provides a low-cost over-torque protection device. The screen transmission over-torque protection device of this embodiment is used in a rotary hook-rake screen machine and is specifically arranged in the screen transmission portion of the rotary hook-rake screen machine. This embodiment also provides a rotary hook-rake screen machine having the screen transmission over-torque protection device. The rotary hook-rake screen machine has a screen connected to the screen transmission over-torque protection device and is driven to rotate by the screen transmission over-torque protection device.

[0020] Specifically, the screen drive over-torque protection device of this embodiment primarily comprises 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. The driven sprocket 10 is connected to a drive mechanism and driven for rotation by the drive mechanism. The sprocket sleeve 20 is connected to the screen main shaft, thereby driving the rotation of the screen main shaft. The sprocket sleeve 20 and the screen main shaft can be connected, for example, via a flat key. Both the driven sprocket 10 and the sprocket sleeve 20 are components that drive the rotation of the screen main shaft of the rotary hook-rake screen machine.

[0021] 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 rake type grille machine, thereby driving the grille of the rotary hook rake type grille machine to rotate.

[0022] The touch rod 30 is connected to the driven sprocket 10. For example, to avoid interfering with the coordination of the driven sprocket 10 with other transmission mechanisms, the touch rod 30 can be disposed on the side of the circular 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 an existing rotary hook-rake screen machine using threaded fasteners such as screws or bolts, facilitating retrofitting of existing equipment.

[0023] The rotating shaft 40 is connected to the sprocket sleeve 20. For example, to avoid interfering with the sprocket sleeve 20's mating with components such as the main shaft of the rotary hook-rake screen machine, the rotating shaft 40 can be positioned on the side of the sprocket sleeve 20. The rotating shaft 40 is positioned away from the axis of the sprocket sleeve 20 so that it does not obstruct the axis of the sprocket sleeve 20, which serves as the rotation center of the sprocket sleeve 20. The rotating shaft 40 and the contact rod 30 are parallel to each other. For example, the centerline of the rotating shaft 40 and the centerline of the contact rod 30 are parallel to each other. This ensures that components rotating about the rotating shaft 40 maintain a constant distance or contact with the contact rod 30 in the direction of the centerline of the rotating shaft 40 regardless of their rotation position.

[0024] The detection rod 50 is mounted on the rotating shaft 40 and is configured to rotate about the rotating shaft 40 and transition from a first state to a second state when subjected to an external force. The detection rod 50 can be mounted on the rotating shaft 40 and locked with an appropriate torque to prevent the detection rod 50 from rotating about the rotating shaft 40 during normal operation. The detection rod 50 will only rotate about the rotating shaft 40 when pushed by an external force.

[0025] In the first state, the first end of the detection rod 50 is located on the moving trajectory 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 operating 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 trajectory 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 trajectory 31 of the touch rod 30 can refer to the moving trajectory of the center of the touch rod 30, and the moving trajectory is circular. The moving trajectory 31 of the touch rod 30 can refer to the moving trajectory of the entire touch rod 30, and the moving trajectory is annular. It only needs to suffice as long as the first end of the detection rod 50 is located at any position of the circle or ring.

[0026] In the second state, the first end of the detection rod 50 abuts the touch rod 30, and the detection rod 50 is subjected to pressure from the touch rod 30. The pressure from 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, thereby causing the detection rod 50 to rotate about the axis of the sprocket sleeve 20, causing the second end of the detection rod 50 to deviate from the axis of the sprocket sleeve 20. The second state is an overtorque state. At this time, the shear pin 60 between the driven sprocket 10 and the sprocket sleeve 20 is cut off. The driven sprocket 10 continues to rotate under the action of the drive mechanism, but the sprocket sleeve 20 connected to the grid main shaft does not rotate synchronously with the driven sprocket 10. Relative motion occurs between the sprocket sleeve 20 and the driven sprocket 10, so the touch rod 30 applies an external force to the detection rod 50, causing the second end of the detection rod 50 to displace. The second state can be dynamic, and can be the process of the touch rod 30 pushing the first end of the detection rod 50 to move.

[0027] The proximity switch 70 is further away from the sprocket sleeve 20 than the detection rod 50, and is oriented toward the axis of the sprocket sleeve 20. When the detection rod 50 is in a first state, the second end of the detection rod 50 approaches 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, thereby generating a first signal. When the detection rod 50 is in a 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, thereby generating a second signal. The first and second signals 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 approaching or moving away from the axis of the sprocket sleeve 20, thereby detecting the occurrence of overtorque. The proximity switch 70 can be a conventional proximity switch 70, and the second end of the detection rod 50 does not need to apply pressure to the proximity switch 70; the proximity switch 70 is triggered simply by the second end of the detection rod 50 approaching the proximity switch 70.

[0028] In this embodiment, the driven sprocket 10 is the key power transmission element in the equipment. High-precision shear pins 60 connect the driven sprocket 10 to the sprocket sleeve 20, transmitting torque to the grid main shaft. This embodiment, in addition to the over-torque protection provided by the shear pins 60, also adds automatic and timely over-torque detection. This over-torque detection is achieved by leveraging the principle that all moving components move synchronously and maintain a fixed axis during normal equipment operation, and that relative motion creates misalignment when over-torque occurs.

[0029] When an over-torque fault 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.

[0030] 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.

[0031] In some examples, the detection rod 50 includes a rod body 51, a sleeve 52, and a detection plate 53. The sleeve 52 is located on one side of the middle of the rod body 51 and 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 and the second end of the detection rod 50 are respectively located on both sides of the sleeve 52 or the rotating shaft 40. The rotating shaft 40 serves as the fulcrum for the rotation of the rod body 51. The detection plate 53 is provided at the end of the rod body 51. The radial dimension of the detection plate 53 is larger than the diameter of the rod body 51. The detection plate 53 constitutes the second end of the detection rod 50. By providing a larger detection plate 53, the detection plate 53 has a flat surface, which allows the proximity switch 70 to better sense the approach of the detection plate 53 and trigger an action. The larger area of ​​the detection plate 53 also helps maintain system stability. When the detection rod 50 is slightly offset due to reasons such as machine vibration, the detection plate 53 can still block the axis of the sprocket sleeve 20, and the detection plate 53 can still be located within the proximity sensing distance of the proximity switch 70, avoiding false detection of over-torque. In the first state, the center of the detection plate 53 can be directly opposite the axis of the driven sprocket 10.

[0032] In some examples, the distance from the rotating shaft 40 to the moving trajectory 31 of the touch rod 30 is less 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 the first end of the detection rod 50 to produce a smaller displacement, which can cause the second end of the detection rod 50 to produce a larger displacement and thus move away from the proximity switch 70, which is beneficial to improving the sensitivity of over-torque detection.

[0033] 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 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 overtorque occurs, thereby detecting overtorque more promptly. 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 and the detection rod 50 are in contact without generating pressure, or the touch rod 30 and the detection rod 50 are in contact and generate pressure, but this pressure does not constitute the additional force, i.e., external force, described in this embodiment, and the detection rod 50 can withstand this 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°.

[0034] 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 toward 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 the touch rod 30 presses toward 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.

[0035] In some examples, the grille 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 mounted on the sprocket sleeve 20 may also be located in the housing 80. The housing 80 may be a housing that accommodates a drive mechanism. The support 90 is connected to the housing 80 and extends axially outward from the sprocket sleeve 20. The proximity switch 70 is connected to the support 90 to facilitate positioning and installation of the proximity switch 70.

[0036] 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 disposed on the side of the driven sprocket 10, and the rotating shaft 40 is disposed on the side of the sprocket sleeve 20. This does not affect the movement of the driven sprocket 10 and the rotating shaft 40, and facilitates the installation of the rotating shaft 40 and the touch rod 30 on the driven sprocket 10 and sprocket sleeve 20 of existing equipment. The touch rod 30 can be a short round rod, mounted on the outer ring of the driven sprocket 10, and rotates with the driven sprocket 10. The rotating shaft 40 can also be a short round rod, mounted on the outer ring of the sprocket sleeve 20, and rotates with the sprocket sleeve 20.

[0037] In some examples, the detection rod 50 is interference fit with the rotating shaft 40, and the rotating shaft 40 exerts 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 only rotate around the rotating shaft 40 when subjected to external force.

[0038] In other examples, the detection rod 50 is rotatably engaged with the rotating shaft 40, and the grid transmission over-torque protection device further includes a tightening mechanism, which is provided 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, i.e., 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 the sprocket sleeve 20 or the rotating shaft 40, and the other end of which abuts the non-rotating 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-rotating center position of the detection rod 50. Of course, the function of the detection rod 50 and the rotating shaft 40 rotating under the action of an external force can also be achieved through other structures.

[0039] This embodiment also provides a grille transmission over-torque protection method, which is based on the above-mentioned grille transmission over-torque protection device. 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. The output end of the driving member 100 transmits power to the driven sprocket 10 through the chain 120.

[0040] The grille 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, thereby better protecting the driving member 100 and the equipment.

[0041] In some examples, the proximity switch 70 can be electrically connected to the driver 100 or communicated via wireless signal transmission, and the signal from the proximity switch 70 is transmitted to the driver 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 to the proximity switch 70 and the driver 100 and communicated with the controller to control the start and stop of the driver 100 based on the signal sent by the proximity switch 70.

[0042] In some examples, the grille transmission over-torque protection device further includes an alarm, which can emit a sound, light, or display a sign to issue an alarm signal. The alarm can be located on the proximity switch 70, on the housing 80, or on the control box of the original equipment. The alarm can be electrically connected or communicatively connected to the proximity switch 70.

[0043] 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, thereby facilitating equipment maintenance and smooth progress of the process.

[0044] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection 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 concentrically arranged, 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 trajectory 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 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 is toward 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, and 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. The detection plate constitutes the second end of the detection rod.

3. A grid 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 grid 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 close to the detection rod.

5. A grid 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 grid 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 fitted 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.

Images