A safety fall arrest device for power maintenance operations

Abstract

This invention discloses a safety fall arrest device for power maintenance operations, comprising a steel wire rope, a fall arrest box mounted on the steel wire rope, and through holes in the top and bottom plates of the fall arrest box that fit with the steel wire rope with clearance. One end of the fall arrest box is open and has a detachable end cap. A locking ring is provided on one side of the fall arrest box. Inside the fall arrest box, two connecting shafts are symmetrically arranged and rotatably rotated along the steel wire rope. One end of each connecting shaft is rotatably connected to the closed end of the fall arrest box. Limiting grooved wheels are provided in the middle of the two connecting shafts, and the two limiting grooved wheels contact the two sides of the steel wire rope. This invention can effectively reduce the descent speed of falling personnel, ensure the personal safety of workers, and prevent sudden stopping of the fall, avoiding injury to workers due to inertia.

Description

Technical Field

[0001] This invention relates to the field of auxiliary equipment technology for power maintenance, and in particular to a safety fall prevention device for power maintenance operations. Background Technology

[0002] During power maintenance work, workers often need to work at heights, especially on tall power lines where they need to climb tens of meters. Therefore, safety precautions are crucial. With advancements in technology, drones can now be used to attach a fixed support frame made of steel wire to the top of the power line tower. The lower end of the safety cable is then anchored close to the ground. The safety cable is equipped with appropriate fall arrest devices and connected to the worker's safety harness, achieving a fall protection effect. Traditional fall arrest devices primarily rely on internal ratchet locking. When the falling speed reaches a certain level, the ratchet locks instantly, causing significant inertia and posing a substantial risk of injury to the worker. Summary of the Invention

[0003] The purpose of this invention is to provide a safety fall prevention device for power maintenance operations, thereby solving the technical problems mentioned in the background section.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This invention discloses a safety fall arrest device for power maintenance operations, comprising a steel wire rope, a fall arrest box mounted on the steel wire rope, and through holes in the top and bottom plates of the fall arrest box that are clearance-fitted with the steel wire rope; one end of the fall arrest box is open and a detachable end cap is provided at the open end, and a locking ring is provided on one side of the fall arrest box; two connecting shafts are symmetrically and rotatably mounted inside the fall arrest box along the steel wire rope, one end of each connecting shaft is rotatably connected to the closed end of the fall arrest box, and a limiting groove wheel is provided in the middle of each connecting shaft, with the two limiting groove wheels contacting both sides of the steel wire rope; the other ends of the two connecting shafts extend to the open end of the fall arrest box and are movably connected to multiple braking blocks evenly in the circumferential direction, each braking block having an arc-shaped structure on the side facing away from the corresponding connecting shaft; two braking sleeves, corresponding to the two connecting shafts respectively, are symmetrically and fixedly mounted on the end cap, and the inner circumferential wall of the braking sleeve is adapted to the arc-shaped contour of the braking block.

[0006] Furthermore, the fall arrestor box and the end cap are provided with threaded holes of the same specification at the four corners, and the two are detachably connected by connecting bolts that are compatible with the threaded holes.

[0007] Furthermore, each of the two connecting shafts is fixedly fitted with a connecting ring at one end near the opening of the fall arrestor box, and each connecting ring is movably connected to each of the brake blocks through a plurality of tension springs evenly arranged along its circumference.

[0008] Furthermore, friction-enhancing textures are provided on the outer wall of each brake block and the inner peripheral wall of the two brake sleeves.

[0009] Furthermore, multiple pressure sensors are uniformly arranged circumferentially on the inner peripheral walls of the two brake sleeves.

[0010] Furthermore, the top and bottom plates of the fall arrestor are respectively equipped with locking mechanisms controlled by the pressure sensor.

[0011] Furthermore, each of the locking mechanisms includes a mounting sleeve fixedly connected to the top or bottom plate of the fall arrestor. A movable seat is slidably disposed inside the mounting sleeve. Multiple vertical electric push rods are uniformly fixedly disposed circumferentially on the outer sides of the top and bottom plates of the fall arrestor. The telescopic end of each electric push rod is fixedly connected to the end of the corresponding movable seat near the fall arrestor. The movable seat has a tapered through hole whose inner diameter gradually increases in the direction away from the fall arrestor. Multiple locking blocks are uniformly disposed circumferentially at the end of each mounting sleeve away from the fall arrestor. Each locking block is slidably disposed radially along the mounting sleeve. The inner wall of each locking block is configured as an arc-shaped structure adapted to the outer contour of the steel wire cable. The outer wall of the lower half of each locking block is configured as a tapered structure adapted to the tapered through hole. Multiple locking blocks within each mounting sleeve are commonly inserted into the corresponding tapered through hole.

[0012] Furthermore, on the peripheral wall of the end of each mounting sleeve away from the fall arrestor box, a plurality of limiting sliding holes are evenly opened along the circumferential direction, each corresponding to one of the locking blocks. A sliding rod is slidably arranged in each limiting sliding hole. One end of each sliding rod located inside the mounting sleeve is fixedly connected to the upper end of the outer wall of each locking block. A limiting head with a diameter larger than the inner diameter of the limiting sliding hole is fixedly arranged at the end of each sliding rod located outside the mounting sleeve. A spring is sleeved on each sliding rod at the position between the limiting head and the mounting sleeve.

[0013] Furthermore, a controller is provided on the outside of the end of the fall arrestor box that is not equipped with a locking ring, and the controller is electrically connected to each of the pressure sensors and each of the electric push rods.

[0014] Furthermore, a rechargeable battery is fixedly installed below the controller in the fall arrestor box. The rechargeable battery is used to supply power to the controller, each of the pressure sensors, and each of the electric push rods.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0016] When a worker using this invention to perform power maintenance accidentally falls, the two limiting grooved wheels inside the fall arrestor box roll rapidly downwards along the steel wire cable. Due to the rapid increase in initial falling speed and acceleration, the rotational acceleration of the two connecting shafts on which the limiting grooved wheels are installed increases. During the rotation, the brake blocks at the ends of the two connecting shafts move away from the connecting shafts and closer to the brake sleeve under the action of centrifugal force, overcoming the pulling force of the pull ring. The outer wall of the brake block contacts the inner wall of the brake sleeve, generating friction and braking deceleration. This effectively reduces the falling speed of the worker, ensuring the worker's personal safety, and prevents the worker from suddenly stopping falling, thus avoiding injury due to inertia. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the disassembled structure of the present invention;

[0020] Figure 3 A schematic diagram of the cross-sectional structure of [the structure].

[0021] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0022] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along the BB direction;

[0023] Explanation of reference numerals in the attached drawings: 1. Steel wire rope; 2. Fall arrestor box; 3. End cap; 4. Connecting bolt; 5. Locking ring; 6. Connecting shaft; 7. Limiting grooved wheel; 8. Brake block; 9. Connecting ring; 10. Tension spring; 11. Brake sleeve; 12. Pressure sensor; 13. Controller; 14. Mounting sleeve; 15. Moving seat; 16. Electric push rod; 17. Tapered through hole; 18. Locking block; 19. Slide rod; 20. Limiting head; 21. Spring; 22. Rechargeable battery. Detailed Implementation

[0024] like Figures 1-5As shown, a safety fall arrest device for power maintenance operations includes a steel wire rope 1, on which a fall arrest box 2 is slidably mounted in a sleeve manner. The top and bottom plates of the fall arrest box 2 are respectively provided with through holes that are clearance-fitted with the steel wire rope 1.

[0025] One end of the fall arrestor box 2 is open and an end cap 3 is detachably installed on the open end. Specifically, the fall arrestor box 2 and the end cap 3 have threaded holes of the same specification at their four corners, and the two are detachably connected by connecting bolts 4 that are compatible with the threaded holes.

[0026] A locking ring 5 is provided on one side of the fall arrestor box 2. The locking ring 5 is used to fasten to the buckle on the safety belt worn by the worker.

[0027] Inside the fall arrestor box 2, two connecting shafts 6 are symmetrically and rotatably installed along the steel wire cable 1. Specifically, one end of each connecting shaft 6 is rotatably connected to the closed end of the fall arrestor box 2, and a limiting groove wheel 7 is fixedly connected to the middle part of each connecting shaft 6. The two limiting groove wheels 7 are in contact with both sides of the steel wire cable 1. The other end of each connecting shaft 6 extends to the open end of the fall arrestor box 2 and is movably connected to multiple brake blocks 8 evenly along the circumference. The side of each brake block 8 facing away from the corresponding connecting shaft 6 has an arc surface structure. In this embodiment, a connecting ring 9 is fixedly sleeved on the end of each connecting shaft 6 near the open end of the fall arrestor box 2. Each connecting ring 9 is movably connected to each brake block 8 through multiple tension springs 10 evenly arranged along its circumference.

[0028] Two brake sleeves 11 are symmetrically fixed on the end cap 3, each corresponding to one of the two connecting shafts 6. The inner peripheral wall of the brake sleeve 11 is adapted to the arcuate contour of the brake block 8. In addition, friction-enhancing textures are provided on the outer peripheral wall of each brake block 8 and the inner peripheral wall of the two brake sleeves 11.

[0029] In practical application, after the steel wire rope and fall arrestor are erected and installed according to existing technology and the illustrated method, before climbing the power equipment, the worker fastens the buckle on their safety belt to the locking ring on the fall arrestor. During the upward climb for power maintenance work, the two limiting grooved wheels inside the fall arrestor roll upward along the steel wire rope. When a worker accidentally falls, the two limiting grooved wheels inside the fall arrestor quickly roll downward along the steel wire rope. Due to the rapid increase in initial descent speed and acceleration, the rotational acceleration of the two connecting shafts housing the limiting grooved wheels increases. During rotation, the brake blocks at the ends of the two connecting shafts move away from the connecting shafts and closer to the brake sleeve under the action of centrifugal force, overcoming the tension of the pull rings. The outer wall of the brake block contacts the inner wall of the brake sleeve, generating friction to brake and decelerate, thereby effectively reducing the descent speed of the falling personnel, ensuring their personal safety, and preventing sudden stopping of the fall, thus avoiding injury due to inertia.

[0030] In addition, as a further improvement to the present invention, multiple pressure sensors 12 are evenly installed circumferentially on the inner peripheral walls of the two brake sleeves 11, and locking mechanisms controlled by the pressure sensors 12 are respectively provided on the top plate and bottom plate of the fall arrestor box 2.

[0031] Specifically: Each locking mechanism includes a mounting sleeve 14 fixedly connected to the top or bottom plate of the fall arrestor 2. A movable seat 15 is slidably mounted inside the mounting sleeve 14 near one end of the fall arrestor 2. Multiple vertical electric push rods 16 are uniformly fixedly mounted circumferentially on the outer sides of the top and bottom plates of the fall arrestor 2. The telescopic end of each electric push rod 16 is fixedly connected to the corresponding movable seat 15 near one end of the fall arrestor 2. The movable seat 15 has a tapered through hole 17 whose inner diameter gradually increases in the direction away from the fall arrestor 2. Multiple locking blocks 18 are evenly installed circumferentially inside the end of each mounting sleeve 14 away from the fall arrestor box. Each locking block 18 is slidably arranged radially along the mounting sleeve 14. The inner wall of each locking block 14 is set with an arc surface structure that matches the outer wall contour of the steel wire cable 1. The outer wall of the lower half of each locking block 14 is set with a conical surface structure that matches the conical through hole 17. The multiple locking blocks 18 in each mounting sleeve 14 are commonly inserted into the corresponding conical through hole 17.

[0032] In this embodiment, each of the mounting sleeves 14 has a plurality of limiting sliding holes uniformly formed along the circumferential direction on the peripheral wall of the end away from the fall arrestor box 2, which correspond one-to-one with the plurality of locking blocks 18. A sliding rod 19 is slidably installed in each of the limiting sliding holes. One end of each sliding rod 19 located inside the mounting sleeve 14 is fixedly connected to the upper end of the outer wall of each locking block 18. A limiting head 20 with a diameter larger than the inner diameter of the limiting sliding hole is fixedly provided at the end of each sliding rod 19 located outside the mounting sleeve 14. A spring 21 is sleeved on each sliding rod 19 at the position between the limiting head 20 and the mounting sleeve 14.

[0033] A controller 13 is installed on the exterior of the end of the fall arrestor 2 that is not equipped with a locking ring. The controller 13 is electrically connected to each of the pressure sensors 12 and each of the electric push rods 16. The controller 13 is a programmable logic controller, which synchronously controls the multiple electric push rods through the sensing signals of the pressure sensors 12. In addition, a rechargeable battery 22 is fixedly installed below the controller 13 in the fall arrestor 2. The rechargeable battery 22 is used to supply power to the controller 13, each of the pressure sensors 12, and each of the electric push rods 16.

[0034] By setting the above-mentioned locking mechanism, when the brake block contacts the inner circumferential wall of the brake sleeve, the pressure sensor transmits the pressure signal it senses to the controller. When the pressure signal reaches the preset value, the controller controls the two sets of electric push rods on the upper and lower sides of the fall arrestor to extend synchronously, pushing the two moving seats to move towards the corresponding locking blocks. During the movement, the conical through holes inside the moving seats will gradually push the locking blocks towards the steel wire rope, and finally clamp the steel wire rope, thereby further slowing down the falling speed and ensuring safety.

[0035] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A safety fall arrest device for power maintenance operations, comprising a steel wire rope, characterized in that: A fall arrestor box is installed on the steel wire cable. The top and bottom plates of the fall arrestor box have through holes that fit the steel wire cable with a clearance. One end of the fall arrestor box is open and has a detachable end cap. A locking ring is provided on one side of the fall arrestor box. Inside the fall arrestor box, two connecting shafts are symmetrically arranged and rotate along the steel wire cable. One end of each connecting shaft is rotatably connected to the closed end of the fall arrestor box. Limiting grooved wheels are provided in the middle of the two connecting shafts, and these wheels contact both sides of the steel wire cable. The other ends of the two connecting shafts extend to the open end of the fall arrestor box and are movably connected to multiple braking blocks evenly along the circumference. Each braking block has an arc-shaped surface on the side facing away from the corresponding connecting shaft. Two braking sleeves, corresponding to the two connecting shafts, are symmetrically fixed on the end cap. The inner circumferential wall of the braking sleeve is adapted to the arc-shaped contour of the braking block. Each of the two connecting shafts has a connecting ring fixedly sleeved at one end near the opening of the fall arrestor box. Each connecting ring is movably connected to each of the brake blocks by a plurality of tension springs evenly arranged along its circumference. Multiple pressure sensors are evenly arranged circumferentially on the inner peripheral walls of the two brake sleeves respectively. The top and bottom plates of the fall arrestor are respectively equipped with locking mechanisms controlled by the pressure sensor; When the brake block contacts the inner circumferential wall of the brake sleeve, the pressure sensor transmits the pressure signal it senses to the controller. When the pressure signal reaches the preset value, the controller controls the two sets of electric push rods on the upper and lower sides of the fall arrestor to extend synchronously, pushing the two moving seats to move towards the corresponding multiple locking blocks. During the movement, the conical through hole inside the moving seat will gradually push the multiple locking blocks towards the steel wire rope, and finally clamp the steel wire rope.

2. The safety fall arrest device for power maintenance operations according to claim 1, characterized in that: The fall arrestor box and the end cap are provided with threaded holes of the same specification at their four corners, and the two are detachably connected by connecting bolts that are compatible with the threaded holes.

3. The safety fall arrest device for power maintenance operations according to claim 1, characterized in that: The outer side wall of each brake block and the inner peripheral wall of the two brake sleeves are provided with friction-enhancing textures.

4. The safety fall arrest device for power maintenance operations according to claim 1, characterized in that: Each locking mechanism includes a mounting sleeve fixedly connected to the top or bottom plate of the fall arrestor. A movable seat is slidably disposed inside the mounting sleeve. Multiple vertical electric push rods are uniformly fixedly disposed circumferentially on the outer sides of the top and bottom plates of the fall arrestor. The telescopic end of each electric push rod is fixedly connected to the end of the corresponding movable seat near the fall arrestor. The movable seat has a tapered through hole whose inner diameter gradually increases in the direction away from the fall arrestor. Multiple locking blocks are uniformly disposed circumferentially at the end of each mounting sleeve away from the fall arrestor. Each locking block is slidably disposed radially along the mounting sleeve. The inner wall of each locking block is configured as an arc-shaped structure adapted to the outer contour of the steel wire cable. The outer wall of the lower half of each locking block is configured as a tapered structure adapted to the tapered through hole. Multiple locking blocks within each mounting sleeve are commonly inserted into the corresponding tapered through hole.

5. The safety fall arrest device for power maintenance operations according to claim 4, characterized in that: On the peripheral wall of the end of each mounting sleeve away from the fall arrestor box, a plurality of limiting sliding holes are evenly opened along the circumference, each corresponding to one of the locking blocks. A sliding rod is slidably arranged in each limiting sliding hole. One end of each sliding rod located inside the mounting sleeve is fixedly connected to the upper end of the outer wall of each locking block. A limiting head with a diameter larger than the inner diameter of the limiting sliding hole is fixedly arranged on the other end of each sliding rod located outside the mounting sleeve. A spring is sleeved on each sliding rod at the position between the limiting head and the mounting sleeve.

6. The safety fall arrest device for power maintenance operations according to claim 4, characterized in that: The fall arrestor box is equipped with a controller on the outside of the end without a locking ring. The controller is electrically connected to each of the pressure sensors and each of the electric push rods.

7. The safety fall arrest device for power maintenance operations according to claim 6, characterized in that: The fall arrestor box is fixedly equipped with a rechargeable battery below the controller. The rechargeable battery is used to supply power to the controller, each of the pressure sensors and each of the electric push rods.

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