Gradient positive pressure type clamping rope friction energy absorber

Abstract

The gradual change positive pressure type rope clamping friction energy absorber comprises a main steel wire rope, a lower clamping plate, an upper clamping plate, a floating pressing unit and a plurality of gradual change pressing devices, and each gradual change pressing device comprises a pressing nut provided with a through threaded hole B, a double-thread shaft, a thin steel wire rope wound on a rope storage wheel and a guide roller; the rope storage wheel is coaxially fixed on a double-thread shaft, and the double-thread shaft is provided with an external thread B and an external thread A; a plurality of through holes are formed in the integral pressing plate, compression nuts are coaxially fixed to the integral pressing plate, the lower clamping plate and the compression nuts are coaxially provided with penetrating threaded holes A, the external threads A are matched with the threaded holes A, and the external threads B are matched with the threaded holes B; the stretching-out end of the thin steel wire rope is fixedly connected with the main steel wire rope, the lower clamping plate is fixed to a roadway foundation, the external thread A and the external thread B are the same in rotation direction, the thread pitch of the external thread A is slightly larger than that of the external thread B, and the thin steel wire rope drives the double-thread shaft to rotate to enable the whole pressing plate to gradually press the spring during sports car braking, so that friction braking force of the main steel wire rope is slowly increased in the long-distance car stopping braking process.

Description

Technical Field

[0001] The invention belongs to the technical field of mine equipment, relates to the technical field of anti-runaway devices and energy absorbers in mine transportation, and specifically relates to a gradual positive pressure type rope clamping friction energy absorber. Background Art

[0002] Inclined shaft transportation is one of the important modes of mine transportation and plays an important role in mine production. Safe and efficient inclined shaft transportation is of great significance to the safe production of coal mines. Accidents caused by cars running away during inclined shaft transportation are accidents that require important attention in the safe transportation of coal mine production, and they must be effectively prevented. Most mines now use protective devices, that is, the inclined shaft cars are braked by the car barrier and the energy absorber to avoid serious accidents caused by cars running away during inclined shaft transportation.

[0003] The existing anti-runaway device for mine cars in inclined mine tunnels is widely used mainly in the friction energy absorber of the wire rope clamp structure. It mainly uses the clamping force of the steel plate on the wire rope to generate friction force to achieve the braking effect by absorbing energy. The size of the friction force depends on the clamping force of the bolts to adjust. In application, there are problems such as the wire rope is easy to be broken if it is too tight, and the wire rope is easy to be pulled out if it is too loose. Moreover, the bolt preload is pre-set during installation and cannot be changed during the braking process, resulting in a large impact force during the initial blocking, which seriously affects the braking safety of the transportation equipment and its drivers and passengers. The prior art (application number CN 201910747475.X) invented an initial pre-buffer clamp type energy absorber and its energy absorption method. Although it can achieve buffer braking in a short time at the moment of blocking to a certain extent, it still cannot adapt to the anti-runaway energy absorption application of inclined shaft transportation equipment (such as monorail crane) with large mass, high kinetic energy and large slope. The main problems are as follows: (1) To achieve a large braking force, the friction clamping plate energy absorber must increase the clamping force (for example, 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, so the rotating clamping wheel will reach the maximum compression stroke of the spring after a few turns, and 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, but when replacing large elastic disc springs, there is a smaller compression stroke (for example, 10 mm), resulting in the rotating clamping wheel reaching the maximum compression stroke of the spring after a few turns. However, for a monorail crane with large mass and high kinetic energy (for example, 50 tons, with a running car speed of 22 m / s), the safe blocking and braking distance must be as far as 50 m. How to achieve long-distance slow-changing force flexible braking is particularly important for human / machine safety. (3) When multiple existing clamping plate energy absorbers are used in series or parallel, the braking intervention is delayed by using the folded and relaxed storage rope between two adjacent energy absorbers. This results in the need for a very long rope and high requirements for the storage rope layout and maintenance (the storage ropes cannot be tangled together to affect normal operation), which increases maintenance costs and reduces application reliability.

[0004] In general, the anti-runaway device and its energy absorber usually do not need to be activated for several years or several years (ideally, no runaway accident will ever occur), but once activated, it must ensure that its energy absorption and braking are reliable. However, the existing splint-type friction energy absorbers cannot achieve a gradual braking force effect over a long stroke, and with the large-scale mining cars or transportation equipment (such as monorail cranes), the energy required for braking absorption is huge. If the blocking process cannot achieve gradual braking energy absorption, the impact force generated is enough to pull out the anchor rod at the top of the monorail crane, causing a serious safety accident. Therefore, it is particularly important to innovate an energy absorber for inclined shafts with long-distance gradual braking force, reliable operation and low manufacturing / maintenance costs, and a multiple combined time-delay intervention braking anti-runaway device. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a gradual positive pressure rope clamp friction energy absorber, which can gradually increase the friction braking force during long-distance vehicle stopping. It has the advantages of long-distance mechanical autonomous buffering flexible braking and effectively ensures the human / machine safety during sports car braking.

[0006] The technical solution adopted by the present invention is: a gradual positive pressure type rope clamp friction energy absorber, including a plurality of main steel wire ropes, a lower clamping plate and an upper clamping plate with a plurality of arc through grooves arranged in parallel on one side of a plane, and a floating clamping unit applying a clamping force to the upper clamping plate, wherein the lower clamping plate is vertically fixed with a plurality of guide columns A extending out from the side of the arc groove, and a plurality of upper clamping plates are placed above the lower clamping plate in parallel after passing through the guide columns A through their through holes, and the arc grooves between the upper clamping plate and the lower clamping plate are aligned and cooperated to clamp a main steel wire rope; the floating clamping unit includes a spring coaxially strung on each guide column A and having its bottom end in contact with the upper clamping plate, a spring passing through the guide columns A through a plurality of through holes and simultaneously pressing The integral pressure plate at the other end of each spring and parallel to the upper clamping plate is fixed to each guide column A and limits the integral pressure plate to generate a pre-compression nut of the initial pre-compression amount of the spring; it also includes a plurality of gradual compression devices that slowly apply a compression force to the floating compression unit, and the gradual compression device includes a compression nut, a double-threaded shaft, a rope storage wheel, a thin steel wire rope and a guide roller that are coaxially provided with a coaxial cylindrical boss and a threaded hole B through which the compression nut is coaxially provided; the rope storage wheel is composed of a disc-shaped rope storage groove and a guide column coaxially fixed to the rope storage groove, and the other end of the guide column is coaxially fixed to the upper top of the double-threaded shaft, and then the double-threaded shaft is provided with a second stepped groove from top to bottom in sequence , external thread B, first stepped groove and external thread A; the integral pressure plate is provided with a plurality of cylindrical through holes, each cylindrical through hole is coaxially installed with a clamping nut and the cylindrical boss end face of the clamping nut is pressed on the upper surface of the integral pressure plate, and the clamping nut is fixedly connected to the integral pressure plate by bolts; the lower clamping plate is provided with a penetrating threaded hole A at the coaxial position of each clamping nut, the external thread A of the double-threaded shaft is threadedly matched with the threaded hole A of the lower clamping plate, and the external thread B of the double-threaded shaft is threadedly matched with the threaded hole B of the coaxial clamping nut; one end of the thin steel wire rope is fixedly connected to the rope storage groove and stored around it, and the other end is passed through After the guide roller is turned, it is fixedly connected with the main steel wire rope; the lower clamping plate is fixed to the tunnel foundation by a number of bolts, the external thread A and the external thread B have the same rotation direction and the pitch of the former is slightly larger than that of the latter. When the sports car brakes, the main steel wire rope is pulled and drives the thin steel wire rope to move together, thereby rotating the double-threaded shaft, causing the double-threaded shaft to move relative to the lower clamping plate in the direction of the compression spring and the compression nut to move relative to the double-threaded shaft in the direction of the loosening spring. Due to the slight difference in the pitch of the external thread A and the external thread B, the compression nut drives the entire pressure plate to gradually compress the spring, thereby slowly increasing the friction braking force of the main steel wire rope during long-distance vehicle braking.

[0007] Preferably, in the gradual positive pressure rope clamp friction energy absorber, the radius of the arc grooves of the lower clamping plate and the upper clamping plate is slightly larger than the radius of the main steel wire rope, and the size of each arc groove is less than or equal to a semicircle; the spring can be a combined disc spring or a cylindrical spring.

[0008] Preferably, in the gradual positive pressure rope clamp friction energy absorber, a guide column tube B with an increased inner hole radius is coaxially provided on the upper end of the clamping nut, and the guide column of the rope storage wheel is coaxially slidably matched with the inner cylindrical hole of the guide column tube B.

[0009] Preferably, in the gradual positive pressure rope clamp friction energy absorber, the lower end of each threaded hole A of the lower clamping plate is coaxially provided with a guide column A with an increased aperture, and the top end of the external thread A in the double threaded shaft is coaxially provided with a guide cylinder with an increased radius, and the cylindrical surface of the guide cylinder is coaxially slidably matched with the cylindrical hole of the guide column A with the same radius.

[0010] Preferably, in the gradual positive pressure type rope clamp friction 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 B of the clamping nut is less than the axial length of the second step groove of the double threaded shaft, and the axial length of the threaded hole A of the lower clamping plate is less than the axial length of the first step groove of the double threaded shaft; when the energy absorber works in the safety protection state with the spring compressed in place, the threaded hole A is located in the first step groove and the threaded hole B is located in the second step groove.

[0011] Preferably, in the gradual positive pressure type rope clamp friction 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 where the thin steel wire rope is fixed to the main steel wire rope is smaller than the allowable breaking force of the thin steel wire rope.

[0012] Preferably, in the above-mentioned gradual positive pressure type rope clamp friction energy absorber, when the energy absorbers are connected in series for use in a sports car protection device, the energy absorbers on a single side of the lane share the same main steel wire rope, and the thin steel wire ropes of each energy absorber are fixedly connected to the main steel wire rope together with the front end of the thin steel wire rope of the first energy absorber close to the car blocking device. In the working state, the lower end face of the clamping nut in each energy absorber is at a different distance from the lower clamping plate, thereby realizing mechanical delayed intervention braking of each energy absorber during the braking process of the sports car.

[0013] Compared with the prior art, the beneficial effects of the utility model are: (1) the present invention has a simple structure and is a purely mechanical structure energy absorber, which has significant advantages such as low manufacturing and operation and maintenance costs; (2) the gradual clamping device of the present invention can realize the slow and small displacement of large-diameter and large-pitch threads to gradually increase the friction braking force of the main steel wire rope, effectively solving the contradiction between the thread size and the small compression displacement requirement under large positive pressure, realizing the gradual increase of friction force during long-distance braking, having the advantages of long-distance mechanical autonomous buffer flexible braking, and effectively ensuring the human / machine safety of sports car braking. (3) The total length of the main steel wire rope must be less than or equal to the length of the thin steel wire rope. The axial length of the threaded hole B of the clamping nut must be less than the axial length of the second step groove of the double threaded shaft, and the axial length of the threaded hole A of the lower clamping plate must be less than the axial length of the first step groove of the double threaded shaft. When the energy absorber works in the safety protection state where the spring is compressed in place, the threaded hole A is located in the first step groove and the threaded hole B is located in the second step groove. At this time, the double threaded shaft is still rotating but is in a spring-compressed and locked state. This can ensure that the thin steel wire rope is not broken when the maximum preset friction braking force is reached, thereby ensuring application safety. (4) When the energy absorbers are used in series for sports car protection, the energy absorbers on one side of the lane share the same main steel wire rope, and the thin steel wire ropes of each energy absorber are fixedly connected to the main steel wire rope together with the front end of the thin steel wire rope of the first energy absorber close to the car blocking device. In the working state, the lower end face of the clamping nut in each energy absorber is at a different distance from the lower clamping plate, so that the mechanical delayed intervention braking of each energy absorber during the braking process of the sports car is realized. This is a purely mechanical delayed intervention without the need for folding the dump rope, and 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 a large elastic force to achieve its gradual compression over a long distance, which has the advantage of a more compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is an axial side view of the gradual positive pressure rope clamp friction energy absorber of the present invention.

[0015] Figure 2 It is a top view of the gradient positive pressure type rope clamp friction energy absorber.

[0016] Figure 3 for Figure 2 AA section view.

[0017] Figure 4 It is a side view of the shaft in which the double-threaded shaft and the rope storage wheel are fixedly connected in the present invention.

[0018] Figure 5 The utility model relates to an anti-runaway device with delayed intervention braking and a gradual positive pressure type rope clamp friction energy absorber connected in series.

[0019] In the figure, 1-main steel wire rope; 2-lower clamping plate; 201-guide column A; 202-guide column cylinder A; 203-threaded hole A; 204-preload nut; 3-upper clamping plate; 4-floating clamping unit; 401-spring; 402-integral clamping plate; 5-gradual clamping device; 501-double threaded shaft; 5011-guide cylinder; 5012-external thread A; 5013-first step groove; 5014-external thread B; 5015-second step groove; 502-rope storage wheel; 5021-rope storage groove; 5022-guide column; 503-guide roller; 504-thin steel wire rope; 505-clamping nut; 5051-threaded hole B; 5052-guide column cylinder B; 6-rope storage drum. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] like Figure 1-Figure 4As shown, a gradual positive pressure type rope clamp friction energy absorber comprises a plurality of main steel wire ropes 1, a lower clamp plate 2 and an upper clamp plate 3 with a plurality of arc through grooves arranged in parallel on one side of a plane, and a floating clamping unit 4 exerting a clamping force on the upper clamp plate 3, wherein the lower clamp plate 2 has a plurality of guide posts A 201 vertically fixedly extended on the arc groove side thereof, and a plurality of upper clamp plates 3 are placed parallel to the lower clamp plate 2 after passing through the guide posts A through their through holes, and the arc grooves between the upper clamp plate 3 and the lower clamp plate 2 are aligned and cooperated to clamp a main steel wire rope 1; the floating clamping unit 4 comprises a spring 401 coaxially strung on each guide post A 201 and having its bottom end in contact with the upper clamp plate 3, an integral pressing plate 402 passing through the guide posts A 201 through a plurality of through holes and simultaneously pressing on the other end of each spring 401 and being parallel to the upper clamp plate 3, and a clamping plate 402 fixed to each guide post A 201 and restrict the overall pressure plate 402 to generate the pre-compression nut 204 of the initial pre-compression amount of the spring; also includes a plurality of gradual compression devices 5 that slowly apply the compression force to the floating compression unit 4, the gradual compression device 5 includes a compression nut 505 that is a coaxial cylindrical boss and coaxially provided with a threaded hole B, a double-threaded shaft 501, a rope storage wheel 502, a thin steel wire rope 504 and a guide roller 503; the rope storage wheel 502 is composed of a disc-shaped rope storage groove 5021 and a guide column 5022 coaxially fixed to the rope storage groove 5021, the other end of the guide column 5022 is coaxially fixed to the upper top of the double-threaded shaft 501, and then the double-threaded shaft 501 is sequentially provided with a second stepped groove 5015, an external thread B from top to bottom. 5014, a first stepped groove 5013 and an external thread A5012; the integral pressure plate 402 is provided with a plurality of cylindrical through holes, each of which is coaxially installed with a clamping nut 505, and the cylindrical boss end face of the clamping nut 505 is pressed on the upper surface of the integral pressure plate 402, and the clamping nut 505 is fixedly connected to the integral pressure plate 402 by bolts; the lower clamping plate 2 is provided with a through threaded hole A203 at the coaxial position of each clamping nut 505, the external thread A 5012 of the double-threaded shaft 501 is threadedly matched with the threaded hole A 203 of the lower clamping plate 2, and the external thread B 5014 of the double-threaded shaft 501 is threadedly matched with the coaxial threaded hole B 5051 of the clamping nut 505; one end of the thin steel wire rope 504 is fixedly connected to the rope storage groove 5021 and stored around it, and the other end is fixedly connected to the main steel wire rope 1 after being turned through the guide roller 503;The lower clamping plate 2 is fixed to the tunnel foundation by a number of bolts. The external thread A 5012 of the double-threaded shaft 501 has the same rotation direction as the external thread B 5014 and the pitch of the former is slightly larger than that of the latter. When the sports car brakes, the main steel wire rope 1 is pulled and drives the thin steel wire rope 504 to move together, thereby rotating the double-threaded shaft 501, so that the double-threaded shaft 501 moves in the direction of tightening the spring relative to the lower clamping plate 2 and the clamping nut 505 moves in the direction of loosening the spring relative to the double-threaded shaft 501. Due to the slight difference in the pitch of the external thread A 5012 and the external thread B 5014, the clamping nut 505 drives the overall pressure plate 402 to gradually compress the spring 401, thereby slowly increasing the friction braking force of the main steel wire rope 1 during long-distance vehicle braking. It can realize the slow and small displacement of large-diameter and large-pitch threads to gradually increase the friction braking force of the main steel wire rope, effectively solving the contradiction between the thread size and the demand for small compression displacement under large positive pressure, realizing the gradual increase of friction force during long-distance braking, and having the advantages of long-distance mechanical autonomous buffer flexible braking, effectively ensuring the human / machine safety of sports car braking. ;

[0024] Preferably, the radius of the arc groove of the lower clamping plate 2 and the upper clamping plate 3 is slightly larger than the radius of the main wire rope 1, and the size of each arc groove is less than or equal to a semicircle; the spring 401 can be a combined disc spring or a cylindrical spring, preferably a disc spring with a small compression stroke and large elastic force is used to achieve gradual compression over a long distance, which has the advantage of a more compact structure.

[0025] Preferably, a guide column B 5052 with an increased inner hole radius is coaxially provided on the upper end of the compression nut 505, and the guide column 5022 of the rope storage wheel 502 is coaxially slidably matched with the inner cylindrical hole of the guide column B 5052.

[0026] Preferably, a guide cylinder A202 with an increased aperture is coaxially provided at the lower end of each threaded hole A203 of the lower clamping plate 2, and a guide cylinder 5011 with an increased radius is coaxially provided at the top end of the external thread A5012 in the double-threaded shaft 501, and the cylindrical surface of the guide cylinder 5011 is coaxially slidably matched with the cylindrical hole of the guide cylinder A202 with the same radius.

[0027] Preferably, the total length of the main steel wire rope 1 is less than or equal to the length of the thin steel wire rope 504; the axial length of the threaded hole B 5051 of the clamping nut 505 is less than the axial length of the second step groove 5015 of the double threaded shaft 501, and the axial length of the threaded hole A 203 of the lower clamping plate 2 is less than the axial length of the first step groove 5013 of the double threaded shaft 501; when the energy absorber works in the safety protection state where the spring is compressed in place, the threaded hole A 203 is located in the first step groove 5013 and the threaded hole B 5051 is located in the second step groove 5015. At this time, the double threaded shaft is still rotating but is in a spring-compressed and locked state, so that the thin steel wire rope will not be broken when the maximum preset friction braking force is reached, thereby ensuring application safety.

[0028] Preferably, when the total length of the main steel wire rope 1 is greater than the total length of the thin steel wire rope 504, the allowable breaking force of the connection joint where the thin steel wire rope 504 is fixed to the main steel wire rope 1 is smaller than the allowable breaking force of the thin steel wire rope.

[0029] Preferably, if Figure 5 As shown, when the energy absorbers are used in series for the sports car protection device, the energy absorbers on one side of the lane share the same main steel wire rope 1, and the thin steel wire rope 504 of each energy absorber is fixedly connected to the main steel wire rope 1 together with the front end of the thin steel wire rope of the first energy absorber close to the car-blocking device. The main steel wire rope is additionally fixed and wound around the rope storage drum 6. When in the working state, the lower end face of the clamping nut 505 in each energy absorber is at a different distance from the lower clamping plate 2, thereby realizing the mechanical delayed intervention braking of each energy absorber during the braking process of the sports car. This is a purely mechanical delayed intervention without the need for folding the storage rope, and has the significant advantages of high reliability and low maintenance cost.

Claims

1. A gradual positive pressure type rope clamp friction energy absorber, comprising a plurality of main steel wire ropes, a lower clamping plate and an upper clamping plate with a plurality of arc through grooves arranged in parallel on one side of a plane, and a floating clamping unit applying a clamping force to the upper clamping plate, wherein the lower clamping plate has a plurality of guide columns A vertically fixed and extended on the arc groove side thereof, and a plurality of upper clamping plates are placed parallel to the lower clamping plate after passing through the guide columns A through their through holes, and the arc grooves between the upper clamping plate and the lower clamping plate are aligned and cooperated to clamp a main steel wire rope; the floating clamping unit comprises a spring coaxially strung on each guide column A and having its bottom end in contact with the upper clamping plate, an integral pressure plate passing through the guide columns A through a plurality of through holes and simultaneously pressing on the other end of each spring and being parallel to the upper clamping plate, and a preload nut fixed to each guide column A and limiting the integral pressure plate to generate an initial preload of the spring; characterized in that It also includes a plurality of gradual clamping devices that slowly apply a clamping force to the floating clamping unit, the gradual clamping device includes a clamping nut, a double-threaded shaft, a rope storage wheel, a thin steel wire rope and a guide roller, which are coaxial cylindrical bosses and coaxially provided with a through threaded hole B; the rope storage wheel is composed of a disc-shaped rope storage groove and a guide column coaxially fixed to the rope storage groove, the other end of the guide column is coaxially fixed to the upper top of the double-threaded shaft, and then the double-threaded shaft is sequentially provided with a second step groove, an external thread B, a first step groove and an external thread A from top to bottom; the integral pressure plate is provided with a plurality of cylindrical through holes, each of which is coaxially installed with a clamping nut and the end face of the cylindrical boss of the clamping nut is pressed on the upper surface of the integral pressure plate, and the clamping nut is fixed to the integral pressure plate by bolts; the lower clamping plate is provided with a through threaded hole A at the coaxial position of each clamping nut, and the outer Thread A is threadedly matched with threaded hole A of the lower clamping plate, and external thread B of the double-threaded shaft is threadedly matched with threaded hole B of the coaxial clamping nut; one end of the thin steel wire rope is fixedly connected to the rope storage groove and stored around it, and the other end is fixedly connected to the main steel wire rope after being turned by the guide roller; the lower clamping plate is fixed to the tunnel foundation by a number of bolts, the external thread A and the external thread B have the same rotation direction and the pitch of the former is slightly larger than that of the latter. When the sports car brakes, the main steel wire rope is pulled and drives the thin steel wire rope to move together, thereby rotating the double-threaded shaft, so that the double-threaded shaft moves relative to the lower clamping plate in the direction of the clamping spring and the clamping nut moves relative to the double-threaded shaft in the direction of the loosening spring. Due to the slight difference in the pitch of the external thread A and the external thread B, the clamping nut drives the overall pressure plate to gradually compress the spring, thereby slowly increasing the friction braking force of the main steel wire rope during long-distance vehicle braking.

2. The gradual positive pressure rope clamp friction energy absorber according to claim 1 is characterized in that: The radius of the arc grooves of the lower clamping plate and the upper clamping plate is slightly larger than the radius of the main wire rope, and the size of each arc groove is smaller than or equal to a semicircle; the spring can be a combined disc spring or a cylindrical spring.

3. The gradual positive pressure rope clamp friction energy absorber according to claim 1 is characterized in that: The upper end of the compression nut is coaxially provided with a guide column tube B with an increased inner hole radius, and the guide column of the rope storage wheel is coaxially slidably matched with the inner cylindrical hole of the guide column tube B.

4. The gradual positive pressure rope clamp friction energy absorber according to claim 1 is characterized in that: A guide cylinder A with an increased aperture is coaxially disposed at the lower end of each threaded hole A of the lower clamping plate, and a guide cylinder with an increased radius is coaxially disposed at the top end of the external thread A in the double-threaded shaft. The cylindrical surface of the guide cylinder and the cylindrical hole of the guide cylinder A are coaxially slidably matched with the same radius.

5. The gradual positive pressure rope clamp friction energy absorber according to claim 1 or claim 3 or claim 4, characterized in that: The total length of the main steel wire rope must be less than or equal to the length of the thin steel wire rope; the axial length of the threaded hole B of the clamping nut must be less than the axial length of the second step groove of the double threaded shaft, and the axial length of the threaded hole A of the lower clamping plate must be less than the axial length of the first step groove of the double threaded shaft; when the energy absorber works in the safety protection state with the spring compressed in place, the threaded hole A is located in the first step groove and the threaded hole B is located in the second step groove.

6. The gradual positive pressure rope clamp friction energy absorber according to claim 1 is characterized in that: 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 where the thin steel wire rope is fixed to the main steel wire rope is smaller than the allowable breaking force of the thin steel wire rope.

7. The gradual positive pressure rope clamp friction energy absorber according to claim 1 is characterized in that: When the energy absorbers are connected in series for sports car protection devices, the energy absorbers on one side of the lane share the same main steel wire rope, and the thin steel wire ropes of each 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 close to the car-blocking device. In the working state, the lower end face of the clamping nut in each energy absorber is at a different distance from the lower clamping plate, thereby realizing mechanical delayed intervention braking of each energy absorber during the braking process of the sports car.

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