A centrifugal self-locking device for anti-fall rail

Abstract

The invention discloses a centrifugal self-locking device for an anti-falling track, which relates to the technical field of high-altitude operation protection, and comprises a first housing, a second housing, a connecting assembly, a centrifugal assembly, a trigger assembly, a cam assembly and two guide assemblies, wherein the centrifugal assembly comprises a tachometer shaft, two tachometer wheels and two centrifugal blocks, wherein the two tachometer wheels are respectively fixed at both ends of the tachometer shaft, the tachometer wheels are in contact with the anti-falling track, and the two centrifugal blocks are respectively hinged at both sides of the middle of the tachometer shaft; the cam assembly comprises a camshaft and a cam, wherein the cam is fixedly sleeved on the camshaft, and a limiting groove is arranged on the camshaft; the trigger assembly comprises a trigger rod and an elastic stretching component, wherein the trigger rod is rotatably mounted on the second housing, one end of the trigger rod is clamped in the limiting groove, and the other end of the trigger rod extends to one side of the tachometer shaft close to the anti-falling track. The device solves the anti-falling problem under extreme special working conditions such as synchronous falling, and effectively ensures the safety of high-altitude workers.

Description

Technical Field

[0001] The invention relates to the technical field of high-altitude operation protection, in particular to a centrifugal self-locking device for an anti-falling track. Background Art

[0002] High-voltage overhead transmission lines are the backbone of power transmission. To ensure the high reliability of the power grid, it is necessary to manually climb the towers to conduct regular inspections of the transmission lines in order to promptly discover and eliminate hidden dangers. Manually climbing the towers is a high-altitude operation, and the safety of the climbers must be guaranteed. Therefore, the anti-fall rail has become an indispensable device for the planning and construction of high-voltage transmission lines, and the self-locking device used in conjunction with the anti-fall rail has become a key component to ensure the safety of the climbers.

[0003] At present, the single circular eccentric self-locking is commonly used in the anti-fall rail of the transmission line. The safety rope hanging point of the tower climber is directly hung on one end of the circular eccentric. When the person falls, the circular eccentric is directly driven to rotate and lock the guide rail to ensure the safety of the personnel. This method has certain disadvantages. When the safety rope of the person falls is not fully opened, the circular eccentric is not pulled to rotate, or the self-locking device and the person fall synchronously, the self-locking device cannot lock the guide rail. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a centrifugal self-locking device for an anti-fall track, which solves the anti-fall problem under extreme special working conditions such as synchronous falling, and effectively ensures the safety of high-altitude workers.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a centrifugal self-locking device for an anti-fall track, comprising a first box, a second box, a connecting assembly, a centrifugal assembly, a trigger assembly, a cam assembly and two guide assemblies, wherein the first box and the second box are fixedly connected via the connecting assembly, the first box and the second box are internally communicated, one guide assembly is disposed on the outside of one side of the first box and the second box, the guide assembly is slidably mounted on the anti-fall track, and one side of the first box and the second box close to the anti-fall track is an open structure; the centrifugal assembly comprises a tachometer wheel shaft, two tachometer wheels and two centrifugal blocks, the two ends of the tachometer wheel shaft are rotatably mounted on the first box and the second box respectively, the two tachometer wheels are fixed on the two ends of the tachometer wheel shaft respectively, and the two tachometer wheels are disposed on the first box and Inside the second box body, the tachometer wheel is in contact with the anti-fall track, and the two centrifugal blocks are respectively hinged on both sides of the middle part of the tachometer wheel shaft; the cam assembly includes a camshaft and a cam, and the two ends of the camshaft are rotatably installed on the first box body and the second box body respectively, the camshaft is located above the tachometer wheel shaft, the cam is fixedly sleeved on the camshaft, and a limiting groove is provided on the camshaft; the trigger assembly includes a trigger rod and an elastic stretching component, the trigger rod is rotatably installed on the second box body, one end of the trigger rod is clamped in the limiting groove, and the other end of the trigger rod extends to a side of the tachometer wheel shaft close to the anti-fall track, and the trigger rod is located between the two tachometer wheels, one end of the elastic stretching component is fixed on the first box body, and the other end of the elastic stretching component is fixed on the camshaft.

[0007] Preferably, a protrusion is respectively provided on the upper part of the first box body and the second box body, and there is a gap between the two protrusions. The guide assembly includes an upper guide plate, a lower guide plate, two guide shafts and two guide wheels. An upper guide plate is provided on the outer side of each protrusion, and a lower guide plate is respectively provided on the outer side of the lower part of the first box body and the second box body. A guide shaft is fixed on the inner side of each upper guide plate and each lower guide plate, and the guide wheel is installed on the guide shaft, and the guide wheel is in contact with the anti-fall track.

[0008] Preferably, the connecting assembly includes a first connecting bolt, a second connecting bolt, a third connecting bolt, a first nut, a second nut and a third nut, the first connecting bolt passes through one of the upper guide plates, the two protrusions and the other upper guide plate in sequence and is fastened by the first nut, the middle part of the first connecting bolt is used to install a safety rope, the second connecting bolt passes through one of the lower guide plates, the second box body, the first box body and the other lower guide plate in sequence and is fastened by the second nut, and the third connecting bolt passes through the second box body and the first box body in sequence and is fastened by the third nut.

[0009] Preferably, the centrifugal assembly also includes two bearings, two raised key blocks and two elastic retaining rings, the two ends of the tachometer wheel shaft are rotatably mounted on the first housing and the second housing through the two bearings respectively, a through hole is provided in the middle of each tachometer wheel, a key slot is provided on the inner wall of each through hole, a groove is provided at the two ends of the tachometer wheel shaft respectively, one raised key block is installed in one of the grooves, one key slot is installed on one of the raised key blocks, an elastic retaining ring is provided between each tachometer wheel and the bearing, and the elastic retaining ring is installed on the tachometer wheel shaft.

[0010] Preferably, the centrifugal assembly also includes two rotating parts respectively arranged on both sides of the middle part of the tachometer wheel shaft, the rotating parts include a centrifugal block shaft, two vertical plates and two locking nuts, the two vertical plates are fixed on the tachometer wheel shaft in sequence along the axial direction of the tachometer wheel shaft, the centrifugal block shaft passes through the two vertical plates in sequence, and a locking nut is respectively installed at both ends of the centrifugal block shaft, and the centrifugal block is rotatably sleeved on the centrifugal block shaft.

[0011] Preferably, the camshaft includes a shaft body, a first circular block and a second circular block, the two ends of the shaft body are rotatably mounted on the first box body and the second box body respectively, the first circular block, the cam and the second circular block are fixed on the shaft body in sequence, and the limit groove is arranged on the second circular block.

[0012] Preferably, the trigger rod includes a first connecting rod, a circular plate and a second connecting rod connected in sequence, the circular plate is rotatably mounted on the second box body by a first fixing bolt, the first connecting rod is used to be clamped in the limiting groove, the second connecting rod extends to the side of the speed measuring wheel shaft close to the anti-fall track, and the second connecting rod is located between the two speed measuring wheels, and the angle between the first connecting rod and the second connecting rod is an obtuse angle.

[0013] Preferably, the elastic stretching component includes a stretching spring, a second fixing bolt and a third fixing bolt, the second fixing bolt is fixed to one side of the first circular ring block, the third fixing bolt is fixed to the first box body, both ends of the stretching spring are respectively fixed to the second fixing bolt and the third fixing bolt, and the stretching spring is located below the camshaft.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] The centrifugal self-locking device for anti-falling track provided by the present invention comprises a first housing, a second housing, a connecting assembly, a centrifugal assembly, a trigger assembly, a cam assembly and two guide assemblies, wherein the centrifugal assembly comprises a speed measuring wheel shaft, two speed measuring wheels and two centrifugal blocks, the cam assembly comprises a camshaft and a cam, and a limit groove is arranged on the camshaft, the trigger assembly comprises a trigger rod and an elastic stretching component, under normal circumstances, the top end of the trigger rod is located in the limit groove, the cam surface is kept from contacting the anti-falling track surface, and the self-locking device can move freely along the track. If the tower climber falls from a high altitude, the self-locking device will fall quickly along the anti-falling track together, when the falling speed reaches a certain speed, the centrifugal block will reach the lower end position of the trigger rod, under the collision of the centrifugal block, the top end of the trigger rod is separated from the limit groove, the cam surface is gradually contacted with the anti-falling track surface and self-locks, so that the self-locking device stops falling on the anti-falling track, ensures personnel safety, solves the anti-falling problem under extreme special working conditions such as synchronous falling, and the centrifugal self-locking device for anti-falling track in the present application is simple and practical, and has high adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a centrifugal self-locking device for an anti-fall track provided by the present invention;

[0018] Figure 2 A cross-sectional view of a centrifugal assembly in a centrifugal self-locking device for an anti-fall track provided by the present invention;

[0019] Figure 3 A schematic diagram of the structure of the centrifugal self-locking device for the anti-fall track provided by the present invention after the second box is removed;

[0020] Figure 4 A schematic diagram of the structure of the centrifugal self-locking device for the anti-fall track provided by the present invention after the first box is removed;

[0021] Figure 5 A schematic diagram of the structure of a cam assembly in a centrifugal self-locking device for an anti-fall track provided by the present invention;

[0022] Figure 6 A schematic diagram of the structure of the anti-fall track provided by the present invention which self-locks after being triggered by the centrifugal self-locking device.

[0023] Description of reference numerals: 100, centrifugal self-locking device for anti-fall rail; 1, anti-fall rail; 2, first box; 3, second box; 4, protrusion; 5, upper guide plate; 6, lower guide plate; 7, guide shaft; 8, guide wheel; 9, first connecting bolt; 10, first nut; 11, second connecting bolt; 12, third connecting bolt; 13, bearing; 14, speed measuring wheel shaft; 15, speed measuring wheel; 16, raised key block; 17, elastic retaining ring; 1 8. Vertical plate; 19. Centrifugal block shaft; 20. Locking nut; 21. Centrifugal block; 22. Camshaft; 2201. Shaft body; 2202. First circular ring block; 2203. Second circular ring block; 23. Cam; 24. Limiting groove; 25. Trigger rod; 2501. First connecting rod; 2502. Round plate; 2503. Second connecting rod; 26. First fixing bolt; 27. Tension spring; 28. Second fixing bolt; 29. ​​Third fixing bolt. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The purpose of the present invention is to provide a centrifugal self-locking device for an anti-fall track, which solves the anti-fall problem under extreme special working conditions such as synchronous falling, and effectively ensures the safety of high-altitude workers.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-Figure 4As shown, a centrifugal self-locking device 100 for an anti-falling track comprises a first housing 2, a second housing 3, a connecting assembly, a centrifugal assembly, a trigger assembly, a cam assembly and two guide assemblies, wherein the first housing 2 and the second housing 3 are fixedly connected by the connecting assembly, the first housing 2 and the second housing 3 are internally connected, a guide assembly is arranged on the outside of one side of the first housing 2 and the second housing 3, the guide assembly is slidably mounted on the anti-falling track 1, the two guide assemblies are symmetrically arranged, and the first housing 2 and the second housing 3 are close to the anti-falling track 1. The centrifugal assembly comprises a tachometer axle 14, two tachometer wheels 15 and two centrifugal blocks 21, the two ends of the tachometer axle 14 are rotatably mounted on the first housing 2 and the second housing 3, the two tachometer wheels 15 are respectively fixed on the two ends of the tachometer axle 14, the two tachometer wheels 15 are respectively arranged inside the first housing 2 and the second housing 3, the tachometer wheels 15 are in contact with the anti-falling track 1, and the two centrifugal blocks 21 are respectively hinged on both sides of the middle of the tachometer axle 14. The cam assembly includes a camshaft 22 and a cam 23. The two ends of the camshaft 22 are rotatably mounted on the first housing 2 and the second housing 3 respectively. The camshaft 22 is located above the speed measuring wheel shaft 14. The cam 23 is fixedly sleeved on the camshaft 22. The camshaft 22 is provided with a limiting groove 24. The trigger assembly includes a trigger rod 25 and an elastic stretching component. The trigger rod 25 is rotatably mounted on the second housing 3. One end of the trigger rod 25 is clamped in the limiting groove 24. The other end of the trigger rod 25 extends to the side of the speed measuring wheel shaft 14 close to the anti-fall track 1. The trigger rod 25 is located between the two speed measuring wheels 15. One end of the elastic stretching component is fixed on the first housing 2, and the other end of the elastic stretching component is fixed on the camshaft 22. The elastic stretching component triggers the cam assembly to stretch and rotate.

[0028] The upper part of the first box body 2 and the second box body 3 are respectively provided with a protrusion 4, and there is a gap between the two protrusions 4. The guide assembly includes an upper guide plate 5, a lower guide plate 6, two guide shafts 7 and two guide wheels 8. An upper guide plate 5 is provided on the outer side of each protrusion 4, and a lower guide plate 6 is provided on the outer side of the lower part of the first box body 2 and the second box body 3. A guide shaft 7 is fixed on the inner side of each upper guide plate 5 and each lower guide plate 6. The guide wheel 8 is installed on the guide shaft 7, and the guide wheel 8 is in contact with the anti-fall track 1. Specifically, the four guide wheels 8 are respectively arranged on both sides of the anti-fall track 1, and the speed measuring wheel 15 is arranged on the upper surface of the anti-fall track 1. The speed measuring wheel 15 and the guide wheel 8 jointly clamp the anti-fall track 1, which plays a role in limiting the movement of the self-locking device, so that the self-locking device can only move freely up and down along the anti-fall track 1.

[0029] The connection assembly includes a first connection bolt 9, a second connection bolt 11, a third connection bolt 12, a first nut 10, a second nut and a third nut. The first connection bolt 9 passes through an upper guide plate 5, two protrusions 4 and another upper guide plate 5 in sequence and is fastened by the first nut 10. The middle part of the first connection bolt 9 is used to install a safety rope, that is, the part of the first connection bolt 9 between the two protrusions 4 can be used as a safety rope hanging point for tower climbers. When climbing the tower, the first connection bolt 9 drives the self-locking device to move up and down along the anti-fall track 1; when the person falls from a high altitude, the first connection bolt 9 provides a fixing point for the person. The second connection bolt 11 passes through a lower guide plate 6, the second box 3, the first box 2 and another lower guide plate 6 in sequence and is fastened by the second nut. The third connection bolt 12 passes through the second box 3 and the first box 2 in sequence and is fastened by the third nut.

[0030] like Figure 2 As shown, the centrifugal assembly also includes two bearings 13, two raised key blocks 16 and two elastic retaining rings 17. The two ends of the speed measuring wheel shaft 14 are rotatably mounted on the first housing 2 and the second housing 3 through the two bearings 13, respectively. A through hole is provided in the middle of each speed measuring wheel 15, and a key slot is provided on the inner wall of each through hole. A groove is provided at each end of the speed measuring wheel shaft 14, a raised key block 16 is installed in a groove, and a key slot is installed on a raised key block 16. An elastic retaining ring 17 is provided between each speed measuring wheel 15 and the bearing 13, and the elastic retaining ring 17 is installed on the speed measuring wheel shaft 14. The speed measuring wheel 15 is circumferentially fixed on the speed measuring wheel shaft 14 through the key slot and the raised key block 16, and is axially fixed through the elastic retaining ring 17, so that the speed measuring wheel 15 and the speed measuring wheel shaft 14 are fixedly connected.

[0031] The centrifugal assembly also includes two rotating parts respectively arranged on both sides of the middle of the tachometer shaft 14, the rotating parts include a centrifugal block shaft 19, two vertical plates 18 and two locking nuts 20, the two vertical plates 18 are fixed on the tachometer shaft 14 in sequence along the axial direction of the tachometer shaft 14, the centrifugal block shaft 19 passes through the two vertical plates 18 in sequence, and a locking nut 20 is respectively installed at both ends of the centrifugal block shaft 19, and the centrifugal block 21 is rotatably sleeved on the centrifugal block shaft 19. The tachometer wheel 15 contacts the upper surface of the anti-fall track 1. When the self-locking device moves, the tachometer wheel 15 will make the tachometer shaft 14 rotate with the movement of the self-locking device, thereby driving the centrifugal block 21 on the tachometer shaft 14 to rotate around the centrifugal block shaft 19. The faster the self-locking device moves, the faster the rotation angular velocity of the tachometer shaft 14 and the rotation angular velocity of the centrifugal block 21 are, the greater the centrifugal force of the centrifugal block 21 is, and the greater the rotation angle of the centrifugal block 21 to the outside.

[0032] like Figure 5As shown, the camshaft 22 includes a shaft body 2201, a first circular block 2202 and a second circular block 2203. The two ends of the shaft body 2201 are rotatably mounted on the first box body 2 and the second box body 3 respectively. The first circular block 2202, the cam 23 and the second circular block 2203 are fixed on the shaft body 2201 in sequence, and the limiting groove 24 is set on the second circular block 2203.

[0033] like Figure 3 As shown, the trigger rod 25 includes a first connecting rod 2501, a circular plate 2502 and a second connecting rod 2503 connected in sequence, the circular plate 2502 is rotatably mounted on the second box body 3 by a first fixing bolt 26, specifically, the first fixing bolt 26 is fixed on the second box body 3, the circular plate 2502 is loosely sleeved on the first fixing bolt 26, the axial direction of the circular plate 2502 is limited by the bolt head of the first fixing bolt 26 and the side wall of the second box body 3, the first connecting rod 2501 is used to be clamped in the limiting groove 24, the second connecting rod 2503 extends to the side of the speed measuring wheel shaft 14 close to the anti-fall track 1, and the second connecting rod 2503 is located between the two speed measuring wheels 15, and the angle between the first connecting rod 2501 and the second connecting rod 2503 is an obtuse angle.

[0034] like Figure 4 As shown, the elastic stretching component includes a stretching spring 27, a second fixing bolt 28 and a third fixing bolt 29. The second fixing bolt 28 is fixed to one side of the first circular block 2202, and the third fixing bolt 29 is fixed to the first box body 2. Both ends of the stretching spring 27 are respectively fixed to the second fixing bolt 28 and the third fixing bolt 29. The stretching spring 27 is located below the camshaft 22. The stretching spring 27 triggers the stretching rotation of the cam assembly.

[0035] Under normal circumstances, the top end of the trigger rod 25 of the self-locking device is located in the limiting groove 24. Under the action of its own gravity and the tension of the tension spring 27, the cam assembly clamps the trigger rod 25. The trigger rod 25 limits the cam assembly, keeping the surface of the cam 23 from contacting the surface of the anti-fall track 1, and the self-locking device can move freely along the anti-fall track 1.

[0036] like Figure 6As shown, if the tower climber falls from a high altitude, the self-locking device will fall rapidly along the anti-fall track 1. When the falling speed reaches a certain speed, the centrifugal block 21 rotates outward at a large angle, and the centrifugal block 21 will reach the lower end position of the trigger rod 25. Under the collision of the centrifugal block 21, the trigger rod 25 rotates counterclockwise with the first fixing bolt 26 as the axis, and the top of the trigger rod 25 is separated from the limiting groove 24; since the cam assembly is no longer limited by the trigger rod 25, it will rotate counterclockwise around its own axis under the action of its own gravity and the pulling force of the tension spring 27, and the surface of the cam 23 gradually contacts and self-locks with the surface of the anti-fall track 1, so that the self-locking device stops falling on the anti-fall track 1, ensuring the safety of personnel and solving the anti-fall problem under extreme special working conditions such as synchronous falling. In addition, the centrifugal self-locking device 100 for the anti-fall track in this embodiment is simple and practical, with high adaptability, and its specific structure can be appropriately adjusted according to the cross-sectional type of the anti-fall track 1 to adapt to tracks with different cross-sectional types.

[0037] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A centrifugal self-locking device for anti-fall rails, It is characterized in that The invention comprises a first housing, a second housing, a connecting assembly, a centrifugal assembly, a trigger assembly, a cam assembly and two guide assemblies, wherein the first housing and the second housing are fixedly connected via the connecting assembly, the first housing and the second housing are internally communicated, a guide assembly is arranged on the outside of one side of the first housing and the second housing, the guide assembly is slidably mounted on the anti-fall track, and the first housing and the second housing have an open structure on one side close to the anti-fall track; the centrifugal assembly comprises a tachometer wheel shaft, two tachometer wheels and two centrifugal blocks, the two ends of the tachometer wheel shaft are rotatably mounted on the first housing and the second housing, the two tachometer wheels are respectively fixed on the two ends of the tachometer wheel shaft, the two tachometer wheels are respectively arranged inside the first housing and the second housing, and the The tachometer wheel is in contact with the anti-fall track, and the two centrifugal blocks are respectively hinged on both sides of the middle part of the tachometer wheel shaft; the cam assembly includes a camshaft and a cam, and the two ends of the camshaft are rotatably installed on the first box body and the second box body respectively, the camshaft is located above the tachometer wheel shaft, and the cam is fixedly sleeved on the camshaft, and a limiting groove is provided on the camshaft; the trigger assembly includes a trigger rod and an elastic stretching component, the trigger rod is rotatably installed on the second box body, one end of the trigger rod is clamped in the limiting groove, and the other end of the trigger rod extends to a side of the tachometer wheel shaft close to the anti-fall track, and the trigger rod is located between the two tachometer wheels, one end of the elastic stretching component is fixed on the first box body, and the other end of the elastic stretching component is fixed on the camshaft.

2. The centrifugal self-locking device for the anti-fall rail according to claim 1, It is characterized in that A protrusion is respectively provided on the upper part of the first box body and the second box body, and there is a gap between the two protrusions. The guide assembly includes an upper guide plate, a lower guide plate, two guide shafts and two guide wheels. An upper guide plate is provided on the outer side of each protrusion, and a lower guide plate is respectively provided on the outer side of the lower part of the first box body and the second box body. A guide shaft is fixed on the inner side of each upper guide plate and each lower guide plate, and the guide wheel is installed on the guide shaft, and the guide wheel is in contact with the anti-fall track.

3. The centrifugal self-locking device for the anti-fall rail according to claim 2, It is characterized in that The connecting assembly includes a first connecting bolt, a second connecting bolt, a third connecting bolt, a first nut, a second nut and a third nut. The first connecting bolt passes through one of the upper guide plates, the two protrusions and the other upper guide plate in sequence and is fastened by the first nut. The middle part of the first connecting bolt is used to install a safety rope. The second connecting bolt passes through one of the lower guide plates, the second box body, the first box body and the other lower guide plate in sequence and is fastened by the second nut. The third connecting bolt passes through the second box body and the first box body in sequence and is fastened by the third nut.

4. The centrifugal self-locking device for the anti-fall rail according to claim 1, It is characterized in that The centrifugal assembly also includes two bearings, two raised key blocks and two elastic retaining rings. The two ends of the tachometer wheel shaft are rotatably mounted on the first housing and the second housing through the two bearings respectively. A through hole is provided in the middle of each tachometer wheel, and a key slot is provided on the inner wall of each through hole. A groove is provided at the two ends of the tachometer wheel shaft respectively, one raised key block is installed in one of the grooves, and one key slot is installed on one of the raised key blocks. An elastic retaining ring is provided between each tachometer wheel and the bearing, and the elastic retaining ring is installed on the tachometer wheel shaft.

5. The centrifugal self-locking device for the anti-fall rail according to claim 1, It is characterized in that The centrifugal assembly also includes two rotating parts respectively arranged on both sides of the middle part of the tachometer wheel shaft, the rotating parts include a centrifugal block shaft, two vertical plates and two locking nuts, the two vertical plates are fixed on the tachometer wheel shaft in sequence along the axial direction of the tachometer wheel shaft, the centrifugal block shaft passes through the two vertical plates in sequence, and a locking nut is installed at each end of the centrifugal block shaft, and the centrifugal block is rotatably sleeved on the centrifugal block shaft.

6. The centrifugal self-locking device for the anti-fall rail according to claim 1, It is characterized in that The camshaft includes a shaft body, a first circular block and a second circular block. The two ends of the shaft body are rotatably mounted on the first housing and the second housing respectively. The first circular block, the cam and the second circular block are fixed on the shaft body in sequence. The limiting groove is arranged on the second circular block.

7. The centrifugal self-locking device for the anti-fall rail according to claim 6, It is characterized in that The trigger rod includes a first connecting rod, a circular plate and a second connecting rod connected in sequence, the circular plate is rotatably mounted on the second box body by a first fixing bolt, the first connecting rod is used to be clamped in the limiting groove, the second connecting rod extends to the side of the speed measuring wheel shaft close to the anti-fall track, and the second connecting rod is located between the two speed measuring wheels, and the angle between the first connecting rod and the second connecting rod is an obtuse angle.

8. The centrifugal self-locking device for the anti-fall track according to claim 6, It is characterized in that The elastic stretching component includes a stretching spring, a second fixing bolt and a third fixing bolt, the second fixing bolt is fixed to one side of the first circular ring block, the third fixing bolt is fixed to the first box body, the two ends of the stretching spring are respectively fixed to the second fixing bolt and the third fixing bolt, and the stretching spring is located below the camshaft.

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