High-altitude rapid escape device

Abstract

The invention discloses a high-altitude quick escape device, relates to the technical field of quick escape, and aims to solve the technical problem that high-altitude escape is difficult, the high-altitude quick escape device comprises a metal steel rope formed by twisting a plurality of strands of steel ropes, a brake shell is arranged on the peripheral path of the metal steel rope, and a pointed cone seat is arranged at the upper half part in the brake shell in a limited sliding manner; a sunken seat is arranged on the lower half portion in the brake shell in a limiting sliding mode, a restraining structure is arranged on the periphery of the brake shell, at least one clamping structure is arranged at the bottom of the pointed cone seat and comprises a fixing wheel, the fixing wheel is located on one side of the clamping rib and restrains the metal steel rope, and a clamping structure is arranged on one side of the pointed cone seat and the sunken seat and comprises a clamping arc. The clamping arc surrounds the periphery of the metal steel rope and makes contact with the periphery of the metal steel rope when contracting, and an adjusting structure is installed at the top of the brake shell. According to the invention, the survival probability of trapped people in a dangerous environment can be greatly improved, and due to the intermittent jamming design, the use safety of a green hand is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rapid escape, and more specifically, to a high-altitude rapid escape device. Background Art

[0002] There is a lack of economical, delicate, small and simple high-altitude rapid escape equipment on the market at present. When in higher scenic spots, such as the viewing platform of a skyscraper, the cable car carriage on a mountain, the room of a high-rise hotel, etc., in the event of an emergency such as a fire, earthquake, equipment failure, etc., the rapid evacuation and escape of personnel face great challenges. Existing emergency measures, such as stair evacuation, are difficult to ensure the safety and rapid evacuation of personnel when the fire is fierce, the smoke is thick or the building structure is unstable due to an earthquake; while traditional rescue equipment such as fire ladders is limited by factors such as its own height, deployment time and working environment, and often cannot reach the rescue position in time to meet the escape needs of all trapped people. In these high-altitude scenarios, there is a serious lack of a device that allows trapped people to rely on their own strength to achieve rapid and safe landing and escape in an emergency. Without such equipment, trapped people can only passively wait for rescue in a dangerous environment, and their lives are greatly threatened. According to incomplete statistics, in various past high-altitude accidents, a large number of casualties have occurred due to the lack of effective self-rescue and escape means. In view of this, we propose a high-altitude rapid escape device. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-altitude rapid escape device to solve the technical problem of difficult escape at high altitudes.

[0004] To solve the above technical problem, the present invention provides the following technical solution: A high-altitude rapid escape device includes a metal steel rope formed by winding multiple strands of steel ropes. One end of the metal steel rope is fixed at a high place, and the other end of the metal steel rope contacts the ground at a low place. A brake shell is arranged on the outer peripheral path of the metal steel rope. An inlet rope hole and an outlet rope hole for the metal steel rope to pass through are opened on the outer periphery of the brake shell. A pointed cone seat is slidably limited in the upper half of the interior of the brake shell, and a concave seat is slidably limited in the lower half of the interior of the brake shell. The metal steel rope passes through the gap between the pointed cone seat and the concave seat. The bottom of the pointed cone seat and the top of the concave seat are respectively a protruding pointed cone and a conical depression. A plurality of clamping ribs are installed on the top of the concave seat, and a constraint structure is arranged on the outer periphery of the brake shell;

[0005] At least one clamping structure is arranged at the bottom of the pointed cone seat. The clamping structure includes a fixed wheel, which is located on one side of the clamping rib and restricts the metal steel rope. A clamping structure is arranged on one side of the pointed cone seat and the concave seat. The clamping structure includes a clamping arc, which surrounds the outer periphery of the metal steel rope. When the clamping arc shrinks, it contacts the outer periphery of the metal steel rope. An adjusting structure is installed on the top of the brake shell.

[0006] Preferably, the restraint structure includes a plurality of connecting ropes, the connecting ropes are connected with a chest ring, the connecting ropes are curled around the side wall of the chest ring, two connecting bands are connected to the outer periphery of the chest ring, and the connecting bands are connected with wrist rings.

[0007] Preferably, the fixed wheel is composed of a central shaft, a plurality of curved arc rods and resistance blocks. The resistance blocks are made of a material with a large frictional force. The resistance blocks are adhesively fixed to the curved arc rods. One end of the curved arc rod is fixed to the outer periphery of the central shaft, and the central shaft is rotatably connected to the tapered seat.

[0008] Preferably, the clamping structure further includes a tying wire on one side of the wrist ring. A rubber sheath is arranged on the outer periphery of the tying wire. The rubber sheath runs inside the wrist ring. One end of the tying wire is connected with a tying wire pull handle.

[0009] Preferably, a return spring is adhesively connected between the bottom of the recessed seat and the bottom wall of the brake housing. One end of the tying wire is connected to the bottom of the recessed seat to drive the recessed seat or drive the recessed seat through a hydraulic rod.

[0010] Preferably, the intermediate clamping structure includes a fixed seat. The fixed seat is located at the position of the wire inlet hole and is fixed to the brake housing. A rotating head is rotatably connected to the top of the fixed seat. A plurality of chutes adapted to the protruding winding of the outer periphery of the metal steel wire are provided on the inner periphery of the rotating head. A fixed sleeve fixed to the brake housing is arranged above the rotating head. A plurality of connecting short columns are installed on the top of the fixed sleeve. A fixed ring is connected between the tops of the plurality of connecting short columns. The fixed ring is fixed to the clamping arc.

[0011] Preferably, the clamping arc is composed of a plurality of elastic metal sheets and convex clamping heads. The convex clamping heads are fixed to the elastic metal sheets. The elastic metal sheets are fan-shaped with a curved arc. The top of the elastic metal sheet is fixed to the bottom of the fixed ring. The plurality of elastic metal sheets form a tapered structure.

[0012] Preferably, the intermediate clamping structure further includes a ring body. The outer periphery of the ring body fits with the inner wall of the fixed sleeve. A plurality of spiral grooves are provided on the ring body. The spiral grooves are spiral trajectories connected end to end. A clamping ball fixed to the fixed sleeve is arranged on the inner periphery of the spiral groove. A plurality of telescopic rods capable of stretching are connected between the bottom of the ring body and the rotating head.

[0013] Preferably, the adjusting structure includes a bent plate. One end of the bent plate is bolted with an adjusting bolt. A ring plate is rotatably connected to the outer periphery of the adjusting bolt. A connecting ring is arranged below the ring plate. The center of the bottom of the connecting ring is fixed with a connecting head connected to the tapered seat. A convex column protrudes from the center of the top of the connecting head. A pressing spring is adhesively connected between the connecting head and the ring plate.

[0014] Preferably, an adjusting scale is installed on one side of the bent plate. Digital display marks are engraved on the adjusting scale.

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

[0016] 1. By adopting the combined design of a chest ring, a connecting belt and a wrist ring, the present invention facilitates the user to quickly wear and fix. By holding the draw handle of the binding wire to control the lifting of the recessed seat, the sliding and hovering of the braking shell on the metal steel rope are realized. The operation is simple and easy to understand, without professional skills. When hovering, the reset spring drives the clamping rib to move upward to clamp the metal steel rope tightly, and at the same time, the fixed wheel cooperates with the resistance block to further clamp, greatly improving the fixing stability, ensuring the safety of the user when in the air, and solving the problem of being difficult to escape at high altitudes.

[0017] 2. The present invention also utilizes the sliding groove of the rotating head adapted to the protrusion of the metal steel rope winding. When the metal steel rope slides, it drives the rotating head to rotate, and then the ring body drives the rotating head to move up and down through the telescopic rod. When the ring body rises, it squeezes the clamping arc, so that the convex clamping head contacts the metal steel rope to generate friction, achieving an intermittent blocking effect, which helps novices control the speed during the escape process, avoids the danger caused by long-term high-speed sliding, significantly improves the safety of escape, and reduces the risk of injury caused by improper operation.

[0018] 3. The present invention also rotates the adjusting bolt to drive the ring plate to compress the pressing spring, thereby adjusting the pressing force of the connecting head on the tapered seat, realizing the precise adjustment of the clamping force. The user can flexibly adjust the clamping force according to factors such as their own weight, escape speed requirements, and the material of the metal steel rope, which not only ensures the safe braking during the escape process but also avoids affecting the service life of the equipment due to excessive friction, improving the applicability and reliability of the escape device.

[0019] The present invention can be widely applied to various high-altitude places such as the observation deck of skyscrapers, the cabins of mountain cable cars, and the rooms of high-rise hotels. In case of emergencies such as fires, earthquakes, and equipment failures, it provides a reliable means of self-rescue and escape for trapped people, makes up for the deficiencies of traditional emergency measures and rescue equipment, greatly improves the survival probability of trapped people in dangerous environments, and effectively guarantees the safety of personnel's lives. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a schematic semi-sectional structural diagram of the present invention;

[0022] Figure 3 is a schematic structural diagram of the present invention when the clamping structure is driven by a hydraulic rod;

[0023] Figure 4 is a schematic structural diagram of the fixed wheel of the present invention;

[0024] Figure 5Structural schematic diagram of the intermediate card structure of the present invention;

[0025] Figure 6 Half-sectional structural schematic diagram of the intermediate card structure of the present invention;

[0026] Figure 7 Structural schematic diagram of the clamping arc in the present invention;

[0027] Figure 8 Structural schematic diagram of the adjustment structure in the present invention;

[0028] Figure 9 Another embodiment structural schematic diagram of the adjustment structure in the present invention.

[0029] Explanation of the reference numerals in the figure:

[0030] 1. Metal steel rope; 2. Brake housing; 3. Sharp cone seat; 4. Concave seat; 5. Card rib; 6. Constraint structure; 7. Clamping structure; 8. Intermediate card structure; 9. Adjustment structure; 10. Adjustment marking scale;

[0031] 601. Connecting rope; 602. Chest ring; 603. Connecting belt; 604. Wrist ring;

[0032] 71. Fixed wheel; 711. Central axis; 712. Bent arc rod; 713. Resistance block; 702. Binding wire; 703. Binding wire pull handle; 704. Return spring;

[0033] 81. Clamping arc; 811. Elastic metal sheet; 812. Convex chuck; 801. Fixed seat; 802. Rotating head; 803. Fixed sleeve; 804. Connecting short column; 805. Fixed ring; 806. Ring body; 807. Spiral groove; 808. Ball; 809. Telescopic rod;

[0034] 901. Bent plate; 902. Adjusting bolt; 903. Ring plate; 904. Connecting ring; 905. Connecting head; 906. Compression spring; 907. Extension plate; 908. Pressure plate; 909. Adjusting screw; Detailed implementation manners

[0035] As Figures 1 to 8As shown in the figure, a high-altitude rapid escape device of the present invention includes a metal steel cable 1 formed by winding multiple strands of steel cables. One end of the metal steel cable 1 is fixed at a high place, and the other end of the metal steel cable 1 contacts the ground at a low place. A braking housing 2 is arranged on the outer peripheral path of the metal steel cable 1. An inlet hole and an outlet hole for the metal steel cable 1 to pass through are opened on the outer periphery of the braking housing 2. A tapered seat 3 is slidably limited in the upper half of the interior of the braking housing 2, and a recessed seat 4 is slidably limited in the lower half of the interior of the braking housing 2. The sliding limit is achieved through a chute and a slider. The metal steel cable 1 passes through the gap between the tapered seat 3 and the recessed seat 4. The bottom of the tapered seat 3 and the top of the recessed seat 4 are respectively a protruding cone and a conical recess. A plurality of clamping ribs 5 are installed on the top of the recessed seat 4. The design of the clamping ribs 5 in cooperation with the V-shaped structure can greatly enhance the friction force. A restraint structure 6 is arranged on the outer periphery of the braking housing 2. The restraint structure 6 includes a plurality of connecting ropes 601. The connecting ropes 601 are connected to a chest ring 602. The connecting ropes 601 are curled around the side wall of the chest ring 602. Two connecting bands 603 are connected to the outer periphery of the chest ring 602. The connecting bands 603 are connected to wrist rings 604. The wrist rings 604 and the chest ring 602 are adjusted and fixed by a lace or a buckle. The wrist rings 604 are composed of parts for fixing the upper arm and the lower arm, and a plurality of laces are connected to the upper arm and lower arm parts.

[0036] At least one clamping structure 7 is arranged at the bottom of the tapered seat 3. The clamping structure 7 includes a fixed wheel 71. The fixed wheel 71 is located on one side of the clamping rib 5 and restrains the metal steel cable 1. The fixed wheel 71 is composed of a central shaft 711, a plurality of curved rod 712 and a resistance block 713. The resistance block 713 is made of a material with a large friction force. The resistance block 713 is adhesively fixed to the curved rod 712. One end of the curved rod 712 is fixed to the outer periphery of the central shaft 711. The central shaft 711 is rotatably connected to the tapered seat 3. The clamping structure 7 further includes a tying wire 702 on one side of the wrist ring 604. A rubber sheath is arranged on the outer periphery of the tying wire 702. The rubber sheath runs inside the wrist ring 604. One end of the tying wire 702 is connected to a tying wire pull handle 703. A return spring 704 is adhesively connected between the bottom of the recessed seat 4 and the bottom wall of the braking housing 2. The other end of the tying wire 702 is connected to the bottom of the recessed seat 4 to drive the recessed seat 4.

[0037] Working principle: When in use, fix the chest ring 602 at the chest and abdomen position of the user, then fix the wrist ring 604 to the arm. Hold the pulling handle 703 of the tie wire. When sliding is needed, hold the handle of the pulling handle 703 of the tie wire tightly to drive the movement of the tie wire 702, causing the recessed seat 4 to move downward, increasing the distance between the clamping rib 5 and the V-shaped gap, and the clamping resistance of the metal steel wire 1 disappears. With the cooperation of the gravity of the human body, the braking shell 2 can slide on the metal steel wire 1. When hovering is needed, release the handle of the pulling handle 703, and the return spring 704 returns to its original position, causing the clamping rib 5 to move upward to clamp the metal steel wire 1. At the same time, the power generated by the sliding of the metal steel wire 1, combined with the high friction of the resistance block 713, causes the curved arc rod 712 and the resistance block 713 to rotate towards the clamping rib 5, further clamping the metal steel wire 1 in the gap between the curved arc rod 712 and the clamping rib 5, thus playing a clamping role again, improving the fixing stability and enabling the escapee to stop stably in the air.

[0038] For a further embodiment, the recessed seat 4 can also be driven to move by a hydraulic rod according to the situation. The hydraulic rod is controlled to operate through a microswitch or a push switch. When the recessed seat 4 descends and contacts the switch, it can play a clamping role. This design has greater clamping stability, but the economic cost will increase.

[0039] During the sliding process, generally, a certain degree of professionalism is required. It cannot slide for a long time and needs to be intermittently braked to avoid danger caused by excessive falling force and long braking time when landing, resulting in injury when landing.

[0040] It is worth introducing that this device is easy to use and is a convenient escape tool that even people without professional training can use easily.

[0041] A snap-in structure 8 is provided on one side of the tapered seat 3 and the recessed seat 4. The snap-in structure 8 includes a fixed seat 801. The fixed seat 801 is located at the position of the rope inlet hole and is fixed to the brake housing 2. A rotating head 802 is rotatably connected to the top of the fixed seat 801. A plurality of chutes adapted to the protruding winding on the outer periphery of the metal steel rope 1 are provided on the inner periphery of the rotating head 802. A fixed sleeve 803 fixed to the brake housing 2 is provided above the rotating head 802. A plurality of connecting short columns 804 are installed on the top of the fixed sleeve 803. A fixed ring 805 is connected between the tops of the plurality of connecting short columns 804. A clamping arc 81 is fixed to the bottom of the fixed ring 805. The snap-in structure 8 includes the clamping arc 81. The clamping arc 81 surrounds the outer periphery of the metal steel rope 1. When the clamping arc 81 contracts, it contacts the outer periphery of the metal steel rope 1. The clamping arc 81 is composed of a plurality of elastic metal sheets 811 and convex clamping heads 812. The convex clamping heads 812 are fixed to the elastic metal sheets 811. The elastic metal sheets 811 are fan-shaped with a curved arc. The tops of the elastic metal sheets 811 are fixed to the bottom of the fixed ring 805. The plurality of elastic metal sheets 811 form a tapered structure. The snap-in structure 8 further includes a ring body 806. The outer periphery of the ring body 806 fits with the inner wall of the fixed sleeve 803. The ring body 806 is provided with a plurality of spiral grooves 807. The spiral grooves 807 are spiral trajectories connected end to end. A clamping ball 808 fixed to the fixed sleeve 803 is provided on the inner periphery of the spiral grooves 807. A plurality of telescopic rods 809 capable of telescoping are connected between the bottom of the ring body 806 and the rotating head 802. The telescopic rods 809 are composed of rod bodies or pipe sleeves that are tenoned together.

[0042] Working principle: During use, since the metal steel rope 1 passes through the rotating head 802 and cooperates with the chute to be adapted to the protruding winding on the outer periphery of the metal steel rope 1, the rotating head 802 will rotate accordingly. During the rotation process, the ring body 806 is driven to rotate. Due to the telescopic design of the telescopic rod 809 and combined with the spiral groove 807 and the clamping ball 808, through the spiral trajectory of the spiral groove 807 and the design of being connected end to end, the ring body 806 can reciprocally move up and down. During the moving process, when the ring body 806 rises, it can squeeze the outer periphery of the elastic metal sheet 811, so that the convex clamping head 812 squeezes inward and contacts the outer periphery of the metal steel rope 1, generating friction. After descending, the resistance disappears. Thus, during the sliding process, an intermittent blocking effect can be achieved, which is helpful for novice users and improves safety.

[0043] In order to facilitate adjustment of the extrusion force according to the user and avoid excessive friction during use, which will reduce the service life.

[0044] At the top of the brake housing 2, an adjustment structure 9 is installed. The adjustment structure 9 includes a bent plate 901. One end of the bent plate 901 is bolted with an adjustment bolt 902. The outer periphery of the adjustment bolt 902 is rotatably connected with an annular plate 903. Below the annular plate 903, a connecting ring 904 is provided. At the center of the bottom of the connecting ring 904, a connecting head 905 connected to the tapered seat 3 is fixed. At the center of the top of the connecting ring 904, a convex column protrudes. A pressing spring 906 is adhesively bonded between the connecting ring 904 and the annular plate 903. On one side of the bent plate 901, an adjustment scale 10 is installed. Digital display marks are engraved on the adjustment scale 10, and the adjustment scale 10 can adjust the elastic pressure.

[0045] Working principle: When adjustment is required, rotate the adjustment bolt 902 to drive the annular plate 903 to descend, compress the pressing spring 906, increase the elastic compression force, strengthen the tightening of the connecting head 905, and increase the clamping force. By adjusting the position of the adjustment bolt 902, the position of the tapered seat 3 can be adjusted, and further the clamping force can be adjusted. When the adjustment bolt 902 is adjusted to the uppermost position, the pressing spring 906 is in an unloaded state, and the connecting head 905 pulls up the tapered seat 3, that is, it is in a non-use state.

[0046] A second adjustment method is also provided. The adjustment structure 9 includes an extension plate 907, a pressing plate 908, and an adjustment bolt 909. The extension plate 907 is fixed to the tapered seat 3. The pressing plate 908 presses on the top of the tapered seat 3. Both ends of the spring 906 are fixed to the pressing plate 908 and the extension plate 907 respectively. The adjustment bolt 909 is threadedly connected to the brake housing 2, and the bottom end of the adjustment bolt 909 is rotatably connected to the extension plate 907. Thus, when the adjustment bolt 909 is rotated, the spring 906 can be elongated. When the spring 906 is tightened, the pressing plate 908 is tightened and the tapered seat 3 is pressed, and the force can be adjusted by the rotation distance to achieve the adjustment function.

[0047] The embodiments disclosed in the present invention are preferred embodiments, but are not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention according to the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A high-altitude rapid escape device, characterized in that: It comprises a metal steel rope formed by twisting a plurality of steel ropes, one end of the metal steel rope is fixed at a high place, the other end of the metal steel rope is in contact with the ground at a low place, a brake shell is arranged on the outer peripheral path of the metal steel rope, a rope inlet hole and a rope outlet hole for the metal steel rope to pass through are opened on the outer periphery of the brake shell, a pointed cone seat is limited and slidably provided on the upper half of the brake shell, a recessed seat is limited and slidably provided on the lower half of the brake shell, the metal steel rope passes through the gap between the pointed cone seat and the recessed seat, a convex pointed cone and a conical recess are respectively provided between the bottom of the pointed cone seat and the top of the recessed seat, a plurality of clamping ribs are installed on the top of the recessed seat, and a restraining structure is arranged on the outer periphery of the brake shell; At least one clamping structure is arranged at the bottom of the pointed cone seat, and the clamping structure includes a fixed wheel, and the fixed wheel is located on one side of the clamping rib and constrains the metal steel rope. One side of the pointed cone seat and the recessed seat is provided with an interval clamping structure, and the interval clamping structure includes a clamping arc, and the clamping arc surrounds the outer periphery of the metal steel rope. When the clamping arc contracts, it contacts the outer periphery of the metal steel rope. An adjustment structure is installed on the top of the brake shell.

2. A high altitude rapid escape device according to claim 1, characterized in that: The restraint structure includes a plurality of connecting ropes, wherein the connecting ropes are connected to a chest ring, and the connecting ropes are curled and wrapped around the side wall of the chest ring. Two connecting belts are connected to the outer periphery of the chest ring, and the connecting belts are connected to a wrist ring.

3. A high altitude rapid escape device according to claim 2, characterized in that: The fixed wheel is composed of a central axis, a plurality of curved rods and a resistance block. The resistance block is made of a material with relatively large friction. The resistance block is bonded and fixed to the curved rod. One end of the curved rod is fixed to the periphery of the central axis. The central axis is rotatably connected to the pointed cone seat.

4. A high altitude rapid escape device according to claim 3, characterized in that: The clamping structure also includes a tie wire on one side of the wrist ring, a rubber sheath is provided on the outer periphery of the tie wire, the rubber sheath is routed inside the wrist ring, and one end of the tie wire is connected to a tie wire handle.

5. A high altitude rapid escape device according to claim 4, characterized in that: A return spring is bonded between the bottom of the recessed seat and the bottom wall of the brake housing, and one end of the tie wire is connected to the bottom of the recessed seat to drive the recessed seat or drive the recessed seat through a hydraulic rod.

6. A high altitude rapid escape device according to claim 5, characterized in that: The inter-clamp structure includes a fixed seat, which is located at the position of the rope entry hole and fixed to the brake shell. A rotating head is rotatably connected to the top of the fixed seat. The inner circumference of the rotating head is provided with a plurality of sliding grooves that are adapted to the twisted protrusions of the outer circumference of the metal steel rope. A fixed sleeve fixed to the brake shell is arranged above the rotating head, and a plurality of connecting short columns are installed on the top of the fixing sleeve. A fixing ring is connected between the tops of the plurality of connecting short columns, and the fixing ring is fixed to the clamp arc.

7. A high altitude rapid escape device according to claim 6, characterized in that: The clamp arc is composed of multiple elastic metal sheets and a convex clamp head, the convex clamp head is fixed to the elastic metal sheet, the elastic metal sheet is a curved sector, the top of the elastic metal sheet is fixed to the bottom of the fixing ring, and the multiple elastic metal sheets form a pointed cone structure.

8. A high altitude rapid escape device according to claim 7, characterized in that: The inter-clamp structure also includes a ring body, the outer periphery of the ring body is in contact with the inner wall of the fixed sleeve, the ring body is provided with a plurality of spiral grooves, the spiral grooves are spiral tracks connected end to end, a clamping ball fixed to the fixed sleeve is provided on the inner periphery of the spiral groove, and a plurality of retractable telescopic rods are connected between the bottom of the ring body and the rotating head.

9. A high altitude rapid escape device according to claim 8, characterized in that: The adjustment structure includes a bending plate, one end of which is bolted with an adjustment bolt, the outer periphery of the adjustment bolt is rotatably connected to a ring plate, a connecting ring is provided below the ring plate, a connecting head connected to a pointed cone seat is fixed at the bottom center of the connecting ring, a convex column protrudes from the top center of the connecting ring, and a pressure spring is bonded between the connecting ring and the ring plate.

10. A high altitude rapid escape device according to claim 9, characterized in that: An adjustment mark ruler is installed on one side of the bending and extension plate, and a digital display mark is engraved on the adjustment mark ruler.

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