An impact-resistant buffer fall arrestor

Abstract

The utility model belongs to the field of anti -fall device, specifically is a kind of anti -impact buffer anti -fall device, including anti -fall device body;The anti -fall device body bottom is provided with square groove, square groove surface is fixedly connected cover, cover surface is equipped with rope hole, the both sides edge of rope hole is movably connected with connecting plate, the surface edge of connecting plate is movably connected with fixed plate, the both sides of fixed plate are fixedly connected with fixed sheet, the inside of fixed sheet is provided with bearing, the inside of bearing is provided with connecting column, connecting column one end is connected with limit wheel through bearing;Through the collaborative design of limit wheel and groove, the friction buffer function when safety rope swing is realized, safety rope is embedded in groove, limit wheel is freely rotated to reduce rope body friction through bearing, the movable connection of connecting plate and fixed plate allows overall small swing, limit wheel rotation guide and movable connecting plate swing buffer, solve the excessive wear problem caused by rope left and right swing, improve the smoothness of retraction and rope life.

Description

Technical Field

[0001] This utility model relates to the field of fall arresters, specifically an impact-resistant and buffer fall arrester. Background Technology

[0002] A fall arrestor (also known as a speed differential device or speed differential automatic controller) is a safety protection device designed specifically for personnel working at heights or for hoisting goods. Its core function is to quickly brake and lock the falling object within a limited distance (usually no more than 0.2 meters) by sensing the difference in falling speed, effectively reducing the impact force (less than 2949N) to protect the safety of personnel or goods.

[0003] In the prior art, such as in CN211644386U, a buffer-type speed difference fall arrestor is disclosed, which includes a housing with an opening; a frame disposed within the housing; a winding device disposed on the frame, which can wind up the rope when the winding device rotates in the forward direction and release the rope when the winding device rotates in the reverse direction; and an elastic reset member for driving the winding device to rotate in the forward direction.

[0004] Although the aforementioned patent describes a system where multiple pawls simultaneously engage with the ratchet teeth, resulting in fast braking speed and high reliability, and the impact force during braking is evenly distributed among the pawls, thus minimizing the impact force on the differential and enhancing the stability of its components, the rope sways laterally during high-altitude operations. Furthermore, the rope comes into contact with and rubs against the fall arrester's housing during rope deployment and retraction, restricting and hindering smooth deployment. This friction also reduces the rope's lifespan, potentially causing breakage and compromising safety. Therefore, this paper proposes an impact-resistant, buffer-type fall arrester to address these issues. Utility Model Content

[0005] To address the shortcomings of existing technologies, during high-altitude operations, ropes swing left and right, and during rope retraction and deployment, the ropes come into contact with and rub against the housing of the fall arrestor, resulting in restricted and uneven rope retraction and deployment. Furthermore, friction during retraction and deployment can reduce the lifespan of the ropes, causing them to break and reducing safety protection. This utility model proposes an impact-resistant and buffer fall arrestor.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: The anti-impact buffer fall arrester of this utility model includes a fall arrester body; a square groove is provided at the bottom of the fall arrester body, a cover plate is fixedly connected to the surface of the square groove, a rope hole is opened on the surface of the cover plate, connecting plates are movably connected to the two sides of the rope hole, a fixing plate is movably connected to the surface edge of the connecting plate, fixing plates are symmetrically fixedly connected to both sides of the fixing plate, a bearing is provided inside the fixing plate, a connecting column is provided inside the bearing, one end of the connecting column passes through the bearing and connects to a limiting wheel, a groove is opened on the surface of the limiting wheel, a safety rope is provided inside the fall arrester body, the safety rope passes through the rope hole and is embedded in the groove, the limiting wheels are symmetrically arranged on both sides of the rope hole, and a lifting lug is provided at the top of the fall arrester body.

[0007] Preferably, the inner wall of the groove is arc-shaped and coated with a polyurethane wear-resistant coating, and the limiting wheel is made of quenched alloy steel and its surface is nitrided.

[0008] Preferably, the movable connection angle between the connecting plate and the fixed plate is ±15°, and a self-lubricating copper sleeve is provided at the hinge joint between the connecting plate and the cover plate.

[0009] Preferably, a reinforcing rib is welded to the top of the lifting lug, and a rust-proof galvanized layer is provided on the inner wall of the perforation of the lifting lug.

[0010] Preferably, the surface of the safety rope is covered with an aramid fiber abrasion-resistant layer, and the connecting plate is made of Q355B low-alloy high-strength steel.

[0011] Preferably, the outer ring of the bearing is interference-fitted with the fixed plate, the inner ring of the bearing is filled with lithium-based grease between it and the connecting column, and rubber sealing rings are provided on both sides of the bearing.

[0012] The advantages of this utility model are:

[0013] 1. This utility model achieves friction buffering function when the safety rope swings by coordinating the design of the limiting wheel and the groove. The safety rope is embedded in the groove, and the limiting wheel rotates freely through the bearing to reduce rope friction. The movable connection between the connecting plate and the fixed plate allows for small overall swing. The rotation of the limiting wheel guides the swing and the movable connecting plate buffers the swing, which solves the problem of excessive wear caused by the left and right swaying of the rope, and improves the smoothness of retrieval and release and the life of the rope.

[0014] 2. This utility model achieves swing buffering and low-friction hinge by using a ±15° movable angle of the connecting plate and a self-lubricating copper sleeve design. The self-lubricating copper sleeve reduces the frictional resistance at the hinge between the connecting plate and the cover plate, and the limited movable angle avoids excessive swaying. This solves the stress concentration problem caused by rigid connection and enhances structural durability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the main structure of the fall arrestor of this utility model;

[0018] Figure 3 This is a schematic diagram of the connecting plate structure of this utility model;

[0019] Figure 4 For the present utility model Figure 3 Enlarged view of the structure at point A in the middle.

[0020] In the diagram: 1. Fall arrestor body; 2. Square groove; 3. Cover plate; 4. Rope hole; 5. Connecting plate; 6. Fixing plate; 7. Fixing piece; 8. Bearing; 9. Connecting column; 10. Limiting wheel; 11. Groove; 12. Safety rope; 13. Lifting lug. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] Please see Figures 1-4 As shown, an anti-impact buffer fall arrestor includes a fall arrestor body 1; a square groove 2 is provided at the bottom of the fall arrestor body 1, a cover plate 3 is fixedly connected to the surface of the square groove 2, a rope hole 4 is opened on the surface of the cover plate 3, a connecting plate 5 is movably connected to the two sides of the rope hole 4, a fixing plate 6 is movably connected to the surface edge of the connecting plate 5, a fixing piece 7 is fixedly connected to the two sides of the fixing plate 6 on an axisymmetrical basis, a bearing 8 is provided inside the fixing piece 7, a connecting column 9 is provided inside the bearing 8, one end of the connecting column 9 passes through the bearing 8 and connects to a limiting wheel 10, a groove 11 is opened on the surface of the limiting wheel 10, a safety rope 12 is provided inside the fall arrestor body 1, the safety rope 12 passes through the rope hole 4 and is embedded in the groove 11, the limiting wheel 10 is symmetrically arranged on both sides of the rope hole 4, and a lifting lug 13 is provided at the top of the fall arrestor body 1;

[0023] During operation, the safety rope 12 passes through the square groove 2 from inside the fall arrestor body 1, passes through the rope hole 4, and is embedded in the groove 11 of the limit wheels 10 on both sides. When the safety rope 12 swings left and right, the movable hinge of the connecting plate 5 and the fixed plate 6 causes the limit wheels 10 to rotate accordingly. The bearing 8 supports the connecting column 9 to reduce friction. The lifting lug 13 suspends the fall arrestor body 1 to the working position. The limit wheels 10 and the movable connecting plate 5 work together to buffer the swing friction of the safety rope 12, avoid rope wear, and improve the smoothness of winding and unwinding.

[0024] Furthermore, the inner wall of the groove 11 is arc-shaped and coated with a polyurethane wear-resistant coating, and the limiting wheel 10 is made of quenched alloy steel and its surface is nitrided.

[0025] During operation, the inner wall of the groove 11 is machined into an arc shape with a radius matching the diameter of the safety rope 12. A polyurethane coating is sprayed to reduce contact friction. The limit wheel 10 is made of quenched alloy steel and nitrided to form a surface hardened layer. The arc-shaped groove 11 and the wear-resistant coating reduce the coefficient of friction, and the nitriding treatment extends the service life of the limit wheel 10.

[0026] Furthermore, the movable connection angle between the connecting plate 5 and the fixed plate 6 is ±15°, and a self-lubricating copper sleeve is provided at the hinge joint between the connecting plate 5 and the cover plate 3.

[0027] During operation, the hinge shaft of the connecting plate 5 and the fixed plate 6 is fitted with a self-lubricating copper sleeve, which limits the swing angle to ±15° to prevent excessive deflection. The copper sleeve is pre-coated with graphite grease to reduce hinge resistance. The ±15° swing range balances buffering and structural stability, and the self-lubricating copper sleeve reduces maintenance frequency.

[0028] Furthermore, a reinforcing rib plate is welded to the top of the lifting lug 13, and a rust-proof galvanized layer is provided on the inner wall of the perforation of the lifting lug 13;

[0029] During operation, the top of the lifting lug 13 is welded with a triangular reinforcing rib to increase tensile strength. The thickness of the electroplated zinc layer on the inner wall of the perforation is ≥8μm, which prevents rust from the humid environment. The reinforcing rib and the zinc layer enhance the load-bearing capacity and corrosion resistance of the lifting lug 13, ensuring the safety of high-altitude hoisting.

[0030] Furthermore, the surface of the safety rope 12 is covered with an aramid fiber abrasion-resistant layer, and the connecting plate 5 is made of Q355B low alloy high-strength steel.

[0031] During operation, the surface of the safety rope 12 is woven with an aramid fiber wear-resistant layer, and the connecting plate 5 is made of Q355B steel laser-cut into shape with a yield strength ≥355MPa to resist impact loads. The aramid fiber layer protects the surface of the safety rope 12, and the Q355B material ensures the impact resistance and toughness of the connecting plate 5.

[0032] Furthermore, the outer ring of the bearing 8 is interference-fitted with the fixed plate 7, the inner ring of the bearing 8 is filled with lithium-based grease between it and the connecting post 9, and rubber sealing rings are provided on both sides of the bearing 8.

[0033] During operation, the outer ring of bearing 8 is press-fitted to the fixing plate 7 to prevent loosening, the gap between the inner ring and the connecting column 9 is filled with lithium-based grease, and rubber sealing rings are installed on both sides to block dust. The interference fit and sealing lubrication design ensure that the limit wheel 10 rotates smoothly for a long time and reduces the risk of jamming.

[0034] Working principle: The safety rope 12 passes through the square groove 2 and rope hole 4 from the inside of the fall arrester body 1, and is embedded in the groove 11 of the limit wheels 10 on both sides. When the safety rope 12 swings, the limit wheels 10 are driven to rotate by the movable hinge of the connecting plate 5 and the fixed plate 6. The lithium-based grease filled in the bearing 8 reduces rotational friction. The arc-shaped inner wall of the groove 11 and the polyurethane coating reduce rope wear. The lug 13 enhances tensile and rust resistance through the reinforcing rib plate and galvanized layer. The aramid fiber wear-resistant layer wraps the safety rope 12 to resist external friction. The connecting plate 5 of Q355B material and the interference fit bearing 8 work together to realize the integrated function of low resistance release and take-off, swing buffer and impact protection of the safety rope 12.

[0035] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or similar improvements made within the theoretical and principle content of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An impact-resistant buffer fall arrestor, characterized in that: The device includes a fall arrestor body (1); a square groove (2) is provided at the bottom of the fall arrestor body (1), a cover plate (3) is fixedly connected to the surface of the square groove (2), a rope hole (4) is opened on the surface of the cover plate (3), a connecting plate (5) is movably connected to the two sides of the rope hole (4), a fixing plate (6) is movably connected to the surface edge of the connecting plate (5), a fixing piece (7) is fixedly connected to the two sides of the fixing plate (6) symmetrically, a bearing (8) is provided inside the fixing piece (7), a connecting column (9) is provided inside the bearing (8), one end of the connecting column (9) passes through the bearing (8) and connects to a limiting wheel (10), a groove (11) is opened on the surface of the limiting wheel (10), a safety rope (12) is provided inside the fall arrestor body (1), the safety rope (12) passes through the rope hole (4) and is embedded in the groove (11), the limiting wheel (10) is symmetrically arranged on both sides of the rope hole (4), and a lifting lug (13) is provided at the top of the fall arrestor body (1).

2. The anti-impact buffer fall arrestor according to claim 1, characterized in that: The inner wall of the groove (11) is arc-shaped and coated with a polyurethane wear-resistant coating. The limiting wheel (10) is made of quenched alloy steel and its surface is nitrided.

3. The anti-impact buffer fall arrestor according to claim 1, characterized in that: The movable connection angle between the connecting plate (5) and the fixed plate (6) is ±15°, and a self-lubricating copper sleeve is provided at the hinge of the connecting plate (5) and the cover plate (3).

4. The anti-impact buffer fall arrestor according to claim 1, characterized in that: The top of the lifting lug (13) is welded with a reinforcing rib plate, and the inner wall of the perforation of the lifting lug (13) is provided with a rust-proof galvanized layer.

5. The anti-impact buffer fall arrestor according to claim 1, characterized in that: The surface of the safety rope (12) is covered with an aramid fiber wear-resistant layer, and the connecting plate (5) is made of Q355B low alloy high strength steel.

6. The anti-impact buffer fall arrestor according to claim 1, characterized in that: The outer ring of the bearing (8) is interference-fitted with the fixing plate (7), the inner ring of the bearing (8) is filled with lithium-based grease between it and the connecting column (9), and rubber sealing rings are provided on both sides of the bearing (8).

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