A long-distance buffer clamp plate energy absorber and a delay intervention brake runaway prevention device

Abstract

The application discloses a long-distance buffer clamp plate energy absorber and a runaway vehicle prevention device with delayed intervention braking, which comprises a plurality of main steel wire ropes, a lower clamp plate, an upper clamp plate, a floating compression unit for applying compression force to the upper clamp plate, and a gradually changing pressure applying device for applying compression force to the floating compression unit; through the gradually changing pressure applying device of the differential screw mechanism, the continuously small feeding displacement of the large-diameter and large-pitch thread is realized to slowly increase the friction braking force of the main steel wire rope, the contradiction between the thread size and the small compression displacement under the large normal pressure is effectively solved, the long-distance mechanical autonomous buffer flexible braking is realized, and the human / machine safety of the runaway vehicle braking is ensured; the runaway vehicle prevention device with a plurality of the energy absorbers in series or parallel is used, the lower end surface of the sliding nut in each energy absorber is away from the overall pressing plate by a certain distance in the working state, the mechanical delayed autonomous intervention of each energy absorber in the runaway vehicle braking process is realized, the pure mechanical delayed intervention is realized without the need of folding and storing the rope, and the advantages of high reliability and low maintenance cost are achieved.

Description

Technical Field

[0001] This invention belongs to the field of mining equipment technology, specifically relating to anti-runaway devices and energy absorbers in mine transportation, and more specifically to a long-distance buffer plate energy absorber and a delayed intervention braking anti-runaway device. Background Technology

[0002] Inclined shaft transportation is a crucial mode of transportation in mines, playing a vital role in mine production. Safe and efficient inclined shaft transportation is of paramount importance for coal mine safety. Runaway accidents in inclined shaft transportation are a significant concern in coal mine safety and require effective prevention. Most mines now employ protective devices, using a combination of barriers and energy absorbers to brake runaway vehicles and prevent serious accidents.

[0003] The most widely used anti-runaway devices for mine cars in inclined shaft mine roadways are friction-type energy absorbers with wire rope clamps. These devices primarily utilize the clamping force of the steel plates on the wire rope to generate friction, thereby absorbing energy and achieving a braking effect. The magnitude of the friction force is adjusted by the clamping force of the bolts. However, this method suffers from problems such as the wire rope easily breaking if too tight, and easily being pulled out if too loose. Furthermore, the bolt preload is preset during installation and cannot be changed during braking, resulting in a large initial impact force that seriously affects the safety of the transport equipment and its drivers during runaway braking. (Existing technology (application number CN)) (201910747475.X) Invented an initial pre-buffered clamp-type energy absorber and its energy absorption method. Its working principle is as follows: When a mine car detaches from the main hoisting wire rope during operation, and the mine car hits the stop rail and pulls the auxiliary rope, the auxiliary rope pulls the main wire rope, which in turn pulls the initial buffer thin wire rope. The initial buffer thin wire rope then drives the rotating clamping wheel to rotate. Under the action of the guide screw of the rotating clamping wheel, it presses down on the overall pressure plate. Simultaneously, the overall pressure plate presses down on the spring, which in turn presses down on the upper clamping plate, thus... The upper and lower clamping plates clamp together to generate friction on the main wire rope. When the spring is compressed to the point that the friction generated by the clamping force of the upper and lower clamping plates reaches the required friction, the threaded stroke ends and the rotating clamping wheel can no longer rotate. The initial buffering thin wire rope is broken under the continued traction of the main wire rope, thus achieving a buffering effect on the initial impact of the mine car. Afterwards, the mine car drags the main wire rope out, and the friction generated by the upper and lower clamping plates on the main wire rope gradually absorbs the kinetic energy of the mine car, stopping it. Although the above technology achieves a certain degree of instantaneous and short-term buffering braking, it still has some problems and cannot be adapted to the anti-runaway energy absorption application of inclined shaft transportation equipment (such as monorail cranes) with large mass, high kinetic energy, and steep slopes. The main problems are as follows: (1) To achieve a large braking force, the friction clamp energy absorber must increase the clamping force (e.g., a positive pressure of up to 30 tons). At this time, the diameter and pitch of the screw used to provide the clamping spring force will be very large. Then, the maximum compression stroke of the spring will be reached after the rotating clamping wheel rotates a few times. It is impossible to gradually increase the braking friction during the large stroke or full stroke of the main wire rope. (2) To provide a large positive pressure, ordinary cylindrical springs have the problem of large size and non-compactness. However, when replacing with disc springs with large spring force, the compression stroke is smaller (e.g., 10 mm). This causes the maximum compression stroke of the spring to be reached after the rotating clamping wheel rotates a few times. However, for a monorail crane with large mass and high kinetic energy (e.g., 50 tons, with a trolley speed of 22 m / s), the safe stopping and braking distance must reach 50 m. How to achieve long-distance gradual force flexible braking is particularly important for the safety of people / machines.(3) When multiple clamp energy absorbers are connected in series or parallel, the braking intervention relies on the slack storage rope between two adjacent energy absorbers to achieve the delay. This results in a long required rope and high requirements for the arrangement and maintenance of the storage rope (the storage rope cannot be tangled together to affect normal operation), which increases maintenance costs and reduces the reliability of the application. (4) In the above technology, the rotating clamping wheel cannot rotate after the thread stroke ends. The initial buffer thin steel wire rope is broken under the continued pulling of the main steel wire rope. This will cause the thin steel wire rope to continue to sweep at high speed with the mine car, which is very dangerous.

[0004] In general, runaway prevention devices and their energy absorbers typically do not require operation for several years (ideally, runaway accidents should never occur), but once activated, their energy absorption and braking reliability must be ensured. However, existing clamp-type friction energy absorbers cannot achieve a long-stroke, gradual braking effect. Moreover, with the increasing size of mine cars or transportation equipment (such as monorails), the energy that needs to be absorbed by braking is enormous. If the braking process cannot achieve gradual braking and energy absorption, the resulting impact force is sufficient to pull out the top anchor bolts of the monorail, leading to a serious safety accident. Therefore, it is particularly important to innovate an energy absorber for inclined shafts that features long-distance gradual braking force, reliable operation, and low manufacturing / maintenance costs, as well as a runaway prevention device with multiple units working together and delayed intervention braking. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a long-distance buffer plate energy absorber and a delay-intervention braking anti-runaway device using the energy absorber. It achieves gradual increase in frictional braking force during long-distance vehicle blocking through a differential threaded clamping mechanism, realizing long-distance mechanical autonomous buffer flexible braking, effectively ensuring the safety of people and machines during runaway braking.

[0006] The technical solution adopted in this invention is as follows: a long-distance buffer clamp energy absorber, comprising several main steel wire ropes, a lower clamp plate and an upper clamp plate with several arc-shaped through grooves parallel to each other on one side of a plane, and a floating clamping unit that applies clamping force to the upper clamp plate. Several guide posts are vertically fixedly extended from the lower clamp plate on its arc-shaped groove side. Several upper clamp plates pass through the guide posts via their through holes and are placed parallel above the lower clamp plate, with each arc-shaped groove between the upper and lower clamp plates aligned and clamping a main steel wire rope. The floating clamping unit includes springs coaxially connected to each guide post and whose bottom ends contact the upper clamp plate, and springs passing through several through holes through the guide posts and simultaneously pressing on the other end of each spring and parallel to the upper clamp plate. The clamping plate includes an integral pressure plate, a preload nut fixed to each guide post and limiting the integral pressure plate to generate the initial preload of the spring; it also includes a gradual pressure application device that applies pressure to the floating clamping unit. This gradual pressure application device includes a Z-shaped housing fixed to the lower clamping plate and forming a cavity, a double-threaded shaft, a sliding nut in the shape of a cylindrical through hole, a thin steel wire rope, and guide rollers. The top of the housing has a threaded hole A, and a cylindrical through hole coaxially located at the lower end of threaded hole A with an increased diameter. The sidewall of the cylindrical through hole has several concave guide grooves axially arranged. The upper end of the sliding nut has a threaded hole B, and a cylindrical through hole with an increased diameter is coaxially arranged thereafter. The cylindrical surface is provided with several guide bosses. The sliding nut is coaxially fitted into the cylindrical through hole of the housing and slides through the guide bosses and guide grooves. A disc-shaped rope storage wheel is fixed perpendicularly to the top of the double-threaded shaft, and then, along its axial direction from top to bottom, it is provided with a first stepped groove, external thread A, a second stepped groove, and external thread B. External threads A and B have the same direction of rotation, but the former has a slightly larger pitch than the latter. The double-threaded shaft is screwed downwards from the threaded hole A at the top of the housing. The external thread A of the double-threaded shaft is threadedly fitted into threaded hole A, and the external thread B of the double-threaded shaft is threadedly fitted into threaded hole B of the sliding nut. One end of the thin steel wire rope... Fixed to the cable storage wheel and wound around the disc-shaped groove of the cable storage wheel, the other end passes over the guide roller and changes direction before being fixedly connected to the main steel cable below; when a runaway occurs, after the blocking device is activated, the main steel wire rope is pulled and drives the thin steel wire rope to move together. The thin steel wire rope provides torque to the cable storage wheel and drives the double threaded shaft to rotate, causing the double threaded shaft to move downward relative to the housing and the sliding nut to move upward relative to the double threaded shaft. Due to the slight pitch difference between the external threads A and B, the sliding nut slides slowly downward relative to the housing, acting on the overall pressure plate to gradually compress the spring, thereby slowly increasing the frictional braking force of the main steel wire rope during long-distance vehicle braking.

[0007] In the aforementioned long-distance buffer clamp energy absorber, the housing is uniformly provided with several threaded holes A and coaxial cylindrical through holes. Each threaded hole A is matched with a double-threaded shaft and a sliding nut, and the lower end face of the sliding nut acts synchronously on the overall pressure plate. This enables the main steel wire rope to pull several double-threaded shafts to drive the sliding nut to evenly distribute the force on the overall pressure plate, thereby achieving uniform compression of each spring and achieving uniform positive pressure of each main steel wire rope between the upper and lower clamping plates. The lower clamping plate, upper clamping plate, and overall pressure plate are all coaxially provided with cylindrical through holes larger than the diameter of the double-threaded shaft at the axis position of the double-threaded shaft, increasing the vertical stroke of the double-threaded shaft, reducing the height of the housing, and making the overall structure of the energy absorber compact.

[0008] In the long-distance buffer clamp energy absorber, the radius of the arc groove of the lower clamp and the upper clamp is equal to the radius of the main steel wire rope, and the size of each arc groove is slightly smaller than that of a semicircle; the spring can be a combination of disc springs or cylindrical springs, preferably disc springs, which can obtain a large positive pressure within a small compression stroke, making the energy absorber more compact and small.

[0009] Preferably, in the long-distance buffer clamp energy absorber, the total length of the main steel wire rope is less than or equal to the length of the thin steel wire rope; the axial length of the threaded hole A of the housing is less than the axial length of the first stepped groove of the double threaded shaft, and the axial length of the threaded hole B of the sliding nut is less than the axial length of the second stepped groove of the double threaded shaft; when the energy absorber is working in the safety protection state of being pressed into place, the threaded hole A is located in the first stepped groove and the threaded hole B is located in the second stepped groove. At this time, the double threaded shaft still rotates but cannot move axially and the sliding nut no longer slides axially.

[0010] Preferably, in the long-distance buffer clamp energy absorber, the total length of the main steel wire rope is greater than the total length of the thin steel wire rope, and the allowable breaking force of the connection joint between the thin steel wire rope and the main steel wire rope is less than the allowable breaking force of the thin steel wire rope, so that the thin steel wire rope stays at the stationary end instead of moving with the sports car, thus ensuring safety.

[0011] Preferably, a delayed intervention braking anti-runaway device composed of the aforementioned long-distance buffer clamp energy absorbers is provided, wherein energy absorber devices are symmetrically arranged on both sides of the roadway and their anti-runaway devices are connected to form an anti-runaway device; each side's energy absorber device is composed of multiple long-distance buffer clamp energy absorbers arranged in parallel, and the main steel wire rope of each long-distance buffer clamp energy absorber is fixedly connected to one end of the anti-runaway device. When in working condition, the lower end face of the sliding nut in each long-distance buffer clamp energy absorber is a certain distance away from the overall pressure plate, thereby realizing delayed intervention braking of each long-distance buffer clamp energy absorber during runaway braking.

[0012] Preferably, a delayed intervention braking anti-runaway device composed of the aforementioned long-distance buffer clamp energy absorbers is provided, wherein energy absorber devices are symmetrically arranged on both sides of the roadway and connected to a vehicle blocking device to form an anti-runaway device; each side's energy absorber device consists of multiple long-distance buffer clamp energy absorbers arranged in series, and each long-distance buffer clamp energy absorber on one side shares the same main steel wire rope, and the thin steel wire ropes of each long-distance buffer clamp energy absorber are fixed to the main steel wire rope together with the front end of the thin steel wire rope of the first energy absorber near the vehicle blocking device. When in working condition, the lower end face of the sliding nut in each long-distance buffer clamp energy absorber is a certain distance away from the overall pressure plate, thereby realizing mechanical delayed intervention braking of each long-distance buffer clamp energy absorber during runaway braking.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention can gradually increase the friction braking force of the main wire rope by slowly and slightly displacing the large diameter and large pitch thread through the gradual pressure device of the differential thread mechanism. This effectively solves the contradiction between the thread size and the small compression displacement requirement under large positive pressure, realizes the gradual increase of friction force in the long-distance braking process, has the advantage of long-distance mechanical autonomous buffer flexible braking, and effectively ensures the safety of the human / machine during the braking of the sports car. (2) The total length of the main wire rope is less than or equal to the length of the thin wire rope, and the axial length of the threaded hole A of the housing is less than the axial length of the first stepped groove of the double threaded shaft, and the axial length of the threaded hole B of the sliding nut is less than the axial length of the second stepped groove of the double threaded shaft. When the energy absorber is working in the safety protection state of being pressed in place, the threaded hole A is located in the first stepped groove and the threaded hole B is located in the second stepped groove. At this time, the double threaded shaft still rotates but cannot move axially and the sliding nut no longer slides axially, which can achieve the treatment of not breaking the thin wire rope when the maximum braking force is reached. (3) When the total length of the main wire rope is greater than the total length of the thin wire rope, the allowable breaking force of the connection joint between the thin wire rope and the main wire rope must be less than the allowable breaking force of the thin wire rope, so that the thin wire rope stays at the stationary end instead of moving with the trolley, thus ensuring safety. (4) When the anti-runaway device is composed of multiple long-distance buffer plate energy absorbers arranged in series or in parallel, the lower end face of the sliding nut in each long-distance buffer plate energy absorber is a certain distance away from the overall pressure plate in the working state, which can realize the mechanical delayed intervention braking of each long-distance buffer plate energy absorber during the braking process of the trolley. This is a purely mechanical delayed intervention without the need for folding and storing rope, which has the significant advantages of high reliability and low maintenance cost. (5) The present invention can use a disc spring with a small compression stroke and large elastic force to achieve its long-distance gradual compression, which has the advantage of more compact structural size. Attached Figure Description

[0014] Figure 1 This is an isometric view of the long-distance buffer clamp energy absorber of the present invention.

[0015] Figure 2This is a top view of the long-distance buffer plate energy absorber.

[0016] Figure 3 for Figure 2 Sectional view along the BB direction.

[0017] Figure 4 for Figure 2 Sectional view along the CC direction.

[0018] Figure 5 This is an axonometric view of the housing of the application device in the long-distance buffer clamp energy absorber.

[0019] Figure 6 This is an axonometric view of the sliding nut in the long-distance buffer clamp energy absorber.

[0020] Figure 7 This is an isometric view of the double-threaded shaft in the long-distance buffer clamp energy absorber.

[0021] Figure 8 The long-distance buffer clamp energy absorber is in a safe protection state where it is pressed into place.

[0022] Figure 9 This is a runaway prevention device that uses multiple long-distance buffer plates and energy absorbers connected in series with delayed intervention braking.

[0023] In the diagram, 1-Main wire rope; 2-Lower clamping plate; 201-Guide post; 202-Preload nut; 3-Upper clamping plate; 4-Floating clamping unit; 401-Spring; 402-Integral pressure plate; 5-Gradual pressure device; 501-Machine housing; 5011-Threaded hole A; 5012-Reinforcing plate; 5013-Guide groove; 502-Double threaded shaft; 5021-First step groove; 5022-Second step groove; 5023-Rice storage wheel; 5024-External thread A; 5025-External thread B; 503-Sliding nut; 5031-Threaded hole B; 5032-Guide boss; 504-Guide roller; 505-Fine wire rope; 6-Rice storage drum. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0026] In the description of this invention, it should be noted that the terms "middle," "upper," "lower," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] like Figures 1-4 As shown, a long-distance buffer clamp energy absorber includes several main steel wire ropes 1, a lower clamping plate 2 and an upper clamping plate 3 with several arc-shaped through grooves parallel to each other on one side of the plane, and a floating clamping unit 4 that applies a clamping force to the upper clamping plate 2. Several guide posts 201 are vertically fixedly extended from the arc-shaped groove side of the lower clamping plate 2. Several upper clamping plates 3 pass through the guide posts 201 via their through holes and are placed parallel above the lower clamping plate 2. The arc-shaped grooves between the upper clamping plate 3 and the lower clamping plate 2 are aligned and fitted to clamp one main steel wire rope 1. The floating clamping unit 4 includes springs 401 coaxially connected to each guide post 201 and whose bottom ends contact the upper clamping plate 3, and several... A through-hole passes through the guide post 201 and simultaneously presses against the other end of each spring 401, parallel to the upper clamping plate 3. A preload nut 202, fixed to each guide post 201 and restricting the overall pressure plate 402, generates the initial preload of the spring 401. It also includes a gradual pressure device 5 that applies pressure to the floating clamping unit 4. This gradual pressure device 5 includes a Z-shaped housing 501 fixed to the lower clamping plate 2 and forming a cavity, a double-threaded shaft 502, a sliding nut 503 with a cylindrical through-hole, a thin steel wire rope 505, and a guide roller 504. The top of the housing 501 has a threaded hole A 5011. A cylindrical through-hole, coaxially located at the lower end of the threaded hole A 5011 with an enlarged diameter, is partially reinforced by a reinforcing plate 5012. The sidewall of this cylindrical through-hole has several concave guide grooves 5013 axially arranged. Figure 5 As shown. The upper end of the sliding nut 503 is provided with a threaded hole B 5031, and a cylindrical through hole with an increased diameter is provided coaxially thereafter. The outer cylindrical surface is provided with several guide bosses 5032 (such as... Figure 6As shown), the sliding nut 503 is coaxially fitted in the cylindrical through hole of the housing 501 and slides with the guide boss 5032 and the guide groove 5013. The upper top of the double-threaded shaft 502 is fixed with a disc-shaped rope storage wheel 5023 perpendicular to its axis, and then, along its axial direction from top to bottom, it is provided with a first stepped groove 5021, an external thread A 5024, a second stepped groove 5022, and an external thread B 5025. The external threads A 5024 and B 5025 have the same direction of rotation, but the former has a slightly larger pitch than the latter. The double-threaded shaft 502 is screwed downwards from the threaded hole A 5011 at the top of the housing 501. The external thread A 5024 of the double-threaded shaft 502 is threadedly fitted with the threaded hole A 5011, and the external thread B 5025 of the double-threaded shaft 502 is threadedly fitted with the threaded hole B of the sliding nut 503. 5031 Threaded engagement; one end of the fine steel wire rope 505 is fixed to the rope storage wheel 5023 and wound around the disc-shaped groove of the rope storage wheel 5023, and the other end passes over the guide roller 504 and changes direction before being fixedly connected to the main steel cable 1 below; when a runaway occurs, after the blocking device is activated, the main steel wire rope 1 is pulled and drives the fine steel wire rope 505 to move together. The fine steel wire rope 505 provides torque to the rope storage wheel 5023 and drives the double threaded shaft 502 to rotate, so that the double threaded shaft 502 moves downward relative to the housing 501 and the sliding nut 503 moves upward relative to the double threaded shaft 502. Due to the slight pitch difference between the external threads A 5024 and B 5025, the sliding nut 503 slowly slides downward relative to the housing 501 and acts on the overall pressure plate 402 to gradually press the springs 401, thereby slowly increasing the frictional braking force of the main steel wire rope 1 during long-distance vehicle braking.

[0028] like Figures 1-5 As shown, the housing 501 is uniformly provided with a plurality of threaded holes A 5011 and coaxial cylindrical through holes. In this embodiment, two are arranged side by side along the length direction. Each threaded hole A 5011 is matched with a double threaded shaft 502 and a sliding nut 503, and the lower end face of the sliding nut 503 acts synchronously on the overall pressure plate 402. This enables the main steel wire rope 1 to pull the plurality of double threaded shafts 502 to drive the sliding nut 503 to evenly distribute the force on the overall pressure plate 402, thereby achieving uniform compression of each spring 401, and thus achieving uniform positive pressure of each main steel wire rope 1 between the upper clamping plate 3 and the lower clamping plate 2. The lower clamping plate 2, the upper clamping plate 3 and the overall pressure plate 402 are all coaxially provided with cylindrical through holes larger than the diameter of the double threaded shaft 502 at the axis position of the double threaded shaft 502, increasing the vertical stroke space of the double threaded shaft 502, reducing the height of the housing 501 and making the overall structure of the energy absorber more compact.

[0029] like Figure 4As shown, the radius of the arc groove of the lower clamping plate 2 and the upper clamping plate 3 is equal to the radius of the main steel wire rope 1, and the size of each arc groove is slightly smaller than that of a semicircle; the spring 401 can be a combination of disc springs or cylindrical springs, preferably disc springs, which can obtain a large positive pressure within a small compression stroke, making the energy absorber more compact and small.

[0030] Preferably, the total length of the main wire rope 1 is less than or equal to the length of the thin wire rope 505; for example... Figure 8 As shown, the axial length of the threaded hole A 5011 of the housing 501 is less than the axial length of the first stepped groove 5021 of the double threaded shaft 502, and the axial length of the threaded hole B 5031 of the sliding nut 503 is less than the axial length of the second stepped groove 5022 of the double threaded shaft 502. When the energy absorber is in the safety protection state of being pressed in place, the threaded hole A 5011 is located in the first stepped groove 5021 and the threaded hole B 5031 is located in the second stepped groove 5022. At this time, the double threaded shaft 502 still rotates but cannot move axially, and the sliding nut 503 no longer slides axially, thus preventing the thin steel wire rope from breaking when the maximum braking force is reached.

[0031] Preferably, the total length of the main wire rope 1 is greater than the total length of the thin wire rope 505, and the allowable breaking force of the connection joint between the thin wire rope 505 and the main wire rope 1 is less than the allowable breaking force of the thin wire rope 505, so that the thin wire rope 505 ultimately remains at the stationary end of the energy absorber, instead of moving with the sports car, thus ensuring safety.

[0032] A runaway vehicle prevention device consisting of the aforementioned long-distance buffer clamp energy absorbers with delayed intervention braking is provided. Energy absorber devices are symmetrically arranged on both sides of the roadway, and their vehicle blocking devices are connected to form the runaway vehicle prevention device. Each side's energy absorber device consists of multiple long-distance buffer clamp energy absorbers arranged in parallel. The main steel wire rope 1 of each long-distance buffer clamp energy absorber is fixedly connected to one end of the vehicle blocking device. When in working condition, the lower end face of the sliding nut 503 in each long-distance buffer clamp energy absorber is a certain distance away from the overall pressure plate 402, thereby realizing delayed intervention braking of each long-distance buffer clamp energy absorber during runaway vehicle braking.

[0033] A delayed-intervention braking anti-runaway device, comprising the aforementioned long-distance buffer plate energy absorber, has energy absorber devices symmetrically arranged on both sides of the roadway and connected to a vehicle blocking device to form an anti-runaway device; such as Figure 9As shown, each side's energy absorber device consists of multiple long-distance buffer clamp energy absorbers arranged in series. Each long-distance buffer clamp energy absorber on one side shares the same main steel wire rope 1. The fine steel wire ropes 505 of each long-distance buffer clamp energy absorber are all fixed to the main steel wire rope 1 together with the front end of the fine steel wire rope 505 of the first energy absorber closest to the braking device. The remaining length of the main steel wire rope is entirely wound around the rope storage drum 6, realizing rope supply during the braking process. In the standby state, the lower end face of the sliding nut 503 in each long-distance buffer clamp energy absorber is a certain distance away from the overall pressure plate 402, realizing mechanical delayed intervention braking of each long-distance buffer clamp energy absorber during the vehicle braking process. This is a purely mechanical delayed intervention without the need for rope folding, offering significant advantages in high reliability and low maintenance costs.

[0034] This invention utilizes a differential thread mechanism with a gradual pressure application device to gradually increase the frictional braking force of the main wire rope 1 through slow, minute displacement of a large-diameter, large-pitch thread, effectively resolving the contradiction between the thread size and the requirement for minute compression displacement under high positive pressure. This invention employs a disc spring with a small compression stroke and high elasticity to achieve gradual compression over a long distance, resulting in a more compact structure. Furthermore, this invention achieves a gradual increase in frictional force during long-distance braking, providing the advantage of long-distance mechanical autonomous buffer flexible braking, effectively ensuring the safety of the driver and machine during vehicle braking.

Claims

1. A long-distance buffer clamp energy absorber, comprising several main steel wire ropes, a lower clamp plate and an upper clamp plate with several arc-shaped through grooves parallel to each other on one side of a plane, and a floating clamping unit that applies clamping force to the upper clamp plate. The lower clamp plate has several guide posts vertically fixedly extending from its arc-shaped through groove side. Several upper clamp plates pass through the guide posts via their through holes and are placed parallel to the lower clamp plate, with each arc-shaped groove between the upper and lower clamp plates aligned and clamping a main steel wire rope. The floating clamping unit includes springs coaxially connected to each guide post and whose bottom ends contact the upper clamp plate; an integral pressure plate passing through several through holes through the guide posts and simultaneously pressing on the other end of each spring and parallel to the upper clamp plate; and a preload nut fixed to each guide post and restricting the integral pressure plate to generate the initial preload of the spring. The feature is that... It also includes a gradual pressure application device that applies pressure to the floating clamping unit. This device comprises a zigzag-shaped housing fixed to the lower clamping plate and forming a cavity, a double-threaded shaft, a sliding nut with a cylindrical through-hole, a thin steel wire rope, and guide rollers. The top of the housing has a threaded hole A, and a cylindrical through-hole with an enlarged diameter located coaxially at the lower end of threaded hole A. The sidewall of the cylindrical through-hole has several concave guide grooves axially. The upper end of the sliding nut has a threaded hole B, and a cylindrical through-hole with an enlarged diameter is coaxially located thereafter. Several guide bosses are provided on its outer cylindrical surface. The sliding nut is coaxially fitted into the cylindrical through-hole of the housing and slides through the guide bosses and guide grooves. A disc-shaped rope storage wheel is fixed perpendicularly to the top of the double-threaded shaft, and then, along its axial direction from top to bottom, a first stepped groove, external thread A, a second stepped groove, and external thread B are sequentially provided. The directions of rotation of external threads A and B are... The two-threaded shafts are identical, but the former has a slightly larger pitch than the latter. The shaft is screwed downwards from the threaded hole A at the top of the housing. The external thread A of the shaft engages with the threaded hole A, and the external thread B of the shaft engages with the threaded hole B of the sliding nut. One end of the thin steel wire rope is fixed to the rope storage wheel and wound around its disc-shaped groove. The other end passes over the guide roller, changes direction, and is fixedly connected to the main steel cable below. When a runaway vehicle occurs, the blocking device activates, pulling the main steel wire rope and causing the thin steel wire rope to move together. The thin steel wire rope provides torque to the rope storage wheel and rotates the two-threaded shaft, causing it to move downwards relative to the housing and the sliding nut to move upwards relative to the shaft. Due to the difference in pitch between the external threads A and B, the sliding nut slowly slides downwards relative to the housing, acting on the overall pressure plate to gradually compress the spring, thus gradually increasing the frictional braking force of the main steel wire rope during long-distance braking.

2. The long-distance buffer clamp energy absorber according to claim 1, characterized in that, The housing is uniformly provided with a plurality of threaded holes A and coaxial cylindrical through holes. Each threaded hole A is matched with a double threaded shaft and a sliding nut, and the lower end face of the sliding nut acts synchronously on the overall pressure plate. The lower clamping plate, the upper clamping plate and the overall pressure plate are all provided with coaxial cylindrical through holes larger than the diameter of the double threaded shaft at the position of the double threaded shaft axis.

3. The long-distance buffer clamp energy absorber according to claim 1, characterized in that, The radius of the arc grooves of the lower and upper clamping plates is equal to the radius of the main wire rope, and the size of each arc groove is slightly smaller than that of a semicircle; the spring can be a combination of disc springs or cylindrical springs.

4. The long-distance buffer clamp energy absorber according to claim 1, characterized in that, The total length of the main wire rope shall be less than or equal to the length of the thin wire rope; the axial length of the threaded hole A of the housing shall be less than the axial length of the first stepped groove of the double threaded shaft, and the axial length of the threaded hole B of the sliding nut shall be less than the axial length of the second stepped groove of the double threaded shaft; when the energy absorber is in the safety protection state of being pressed into place, the threaded hole A is located in the first stepped groove and the threaded hole B is located in the second stepped groove.

5. The long-distance buffer clamp energy absorber according to claim 1, characterized in that, The total length of the main wire rope is greater than the total length of the thin wire rope, and the allowable breaking force of the connection joint between the thin wire rope and the main wire rope is less than the allowable breaking force of the thin wire rope.

6. A delayed-intervention braking anti-runaway device comprising the long-distance buffer plate energy absorber as described in claim 1, characterized in that, Energy absorber devices are symmetrically arranged on both sides of the roadway and connected to the vehicle blocking device to form a runaway prevention device. Each side's energy absorber device consists of multiple long-distance buffer clamp energy absorbers arranged in parallel. The main steel wire rope of each long-distance buffer clamp energy absorber is fixedly connected to one end of the vehicle blocking device. When in working condition, the lower end face of the sliding nut in each long-distance buffer clamp energy absorber is a certain distance away from the overall pressure plate, so as to realize the delayed intervention braking of each long-distance buffer clamp energy absorber during the runaway braking process.

7. A delayed-intervention braking anti-runaway device composed of a long-distance buffer plate energy absorber as described in claim 1, characterized in that, Energy absorber devices are symmetrically arranged on both sides of the roadway and connected to the vehicle blocking device to form a runaway prevention device. Each side's energy absorber device consists of multiple long-distance buffer clamp energy absorbers in series. Each long-distance buffer clamp energy absorber on one side shares the same main steel wire rope. The thin steel wire ropes of each long-distance buffer clamp energy absorber are fixed to the main steel wire rope together with the front end of the thin steel wire rope of the first energy absorber near the vehicle blocking device. When in working condition, the lower end face of the sliding nut in each long-distance buffer clamp energy absorber is a certain distance away from the overall pressure plate, so as to realize the mechanical delayed intervention braking of each long-distance buffer clamp energy absorber during the runaway braking process.

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