Lifting anti-falling equipment and lifting system

Abstract

The utility model relates to the technical field of lifting traction, in particular to lifting anti-falling equipment and a lifting system. The lifting anti-falling equipment comprises a fixed rail, a movable sliding rail, a driving mechanism, a connecting rope and an anti-falling device, a limiting wedge block and a limiting plate are arranged on the movable sliding rail; a matching inclined surface is arranged on the limiting wedge block; the anti-falling device comprises an anti-falling elastic piece, an anti-falling frame assembly and an anti-falling connecting column. The anti-falling frame assembly is arranged on the limiting wedge block in a sleeving manner; the anti-falling elastic piece is configured to provide elastic force enabling the anti-falling frame assembly to be always away from the limiting plate. When the connecting rope is broken, at least part of the falling-preventing frame assembly moves upwards along the matched inclined face under the action of elastic force, and at least part of the falling-preventing frame assembly moves towards the inner side wall of the square pipe till abutting friction is achieved between the falling-preventing frame assembly and the inner side wall of the square pipe. In this way, when the connecting rope is broken, rapid descending of the movable sliding rail and the cargo carrying platform plate can be slowed down, risks caused by chain breakage are reduced, and damage to human bodies and goods is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to lifting traction technical field, specifically, relate to a kind of lifting anti-falling equipment and lifting system. BACKGROUND

[0002] Automobile tailgate is also called automobile lifting tailgate, automobile loading and unloading tailgate, lifting tailgate, hydraulic automobile tailgate and truck tailgate. It is a kind of lifting and loading equipment installed at the tail of truck and various vehicles. In the prior art, the tailgate is connected with the loading platform and the fixed rail by chain respectively, and the length of the chain between the loading platform and the fixed rail is adjusted by the piston cylinder structure to realize the lifting operation of the loading platform.

[0003] However, in the existing automobile tailgate, when the chain breaks, the loading platform will quickly fall under the influence of its own weight, causing damage to the tailgate structure and the goods on the loading platform. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a kind of lifting anti-falling equipment and lifting system, which can slow down the rapid descent of the movable slide rail and the loading platform when the connecting rope breaks, reduce the risk caused by chain breakage and reduce the damage to the person and goods.

[0005] The embodiments of the utility model can be implemented as follows:

[0006] In a first aspect, the utility model provides a kind of lifting anti-falling equipment, comprising:

[0007] fixed rail, movable slide rail, drive mechanism, connecting rope and anti-falling device;

[0008] One end of the connecting rope is connected with the anti-falling device, and the other end is connected with the drive mechanism;The drive mechanism is configured to extend or shorten the length of the connecting rope between the anti-falling device and the drive mechanism, so that the movable slide rail realizes lifting;

[0009] The fixed rail includes a square tube;Along the height direction of the fixed rail, the movable slide rail is movably arranged in the square tube;Limiting wedge and limiting plate are arranged on the movable slide rail;The limiting wedge has a matching inclined surface, a top end and a bottom end along the height direction of the movable slide rail;From the top end to the bottom end, the thickness of the limiting wedge has a trend of increasing, so that the matching inclined surface is inclined towards the bottom of the movable slide rail;

[0010] The anti-falling device includes anti-falling elastic element, anti-falling frame assembly and anti-falling connecting column;

[0011] One end of the stopper connecting column is provided through the limiting plate, and the other end is connected with the connecting rope; the stopper elastic member is sleeved on the stopper connecting column, and one end of the stopper elastic member abuts against the limiting plate, and the other end can abut against the bottom of the stopper frame assembly; the stopper elastic member is configured to provide an elastic force that makes the stopper frame assembly always move away from the limiting plate;

[0012] When the connecting rope is broken, the stopper frame assembly at least partially moves upward along the matching inclined surface under the action of the elastic force of the stopper elastic member, and at least part of the stopper frame assembly moves towards the inner side wall of the square tube until abutting against the inner side wall of the square tube and generating relative friction.

[0013] In an optional embodiment, the stopper frame assembly further comprises a frame body and a stopper extrusion column; the stopper extrusion column is rotatably arranged on the frame body, and the circumferential surface of the stopper extrusion column can abut against the matching inclined surface;

[0014] When the connecting rope is broken, the elastic force of the stopper elastic member pushes the frame body to move upward; so that the frame body drives the stopper extrusion column to move upward along the matching inclined surface, and the stopper extrusion column moves towards the inner side wall of the square tube until the stopper extrusion column abuts against the inner side wall of the square tube and generates relative friction.

[0015] In an optional embodiment, the stopper extrusion column comprises a rolling body and a rotating shaft; along the axial direction of the rolling body, the rotating shaft is arranged on the end surface of the rolling body;

[0016] The rotating shaft is rotatably connected with the frame body; the rolling body is located in the frame body, and the circumferential surface of the rolling body abuts against the matching inclined surface.

[0017] In an optional embodiment, a mounting groove is formed on the frame body, and the rotating shaft is arranged in the mounting groove; the mounting groove extends from the middle part of the frame body to the end surface of the frame body to form a mounting opening.

[0018] In an optional embodiment, in the same square tube, the frame body has a first end surface close to the side wall of the movable sliding rail and a second end surface away from the side wall of the movable sliding rail; when the connecting rope is broken, the stopper extrusion column moves upward along the matching inclined surface, and the stopper extrusion column can abut against the inner side wall of the square tube and generate relative friction;

[0019] The mounting opening is located on the second end surface.

[0020] In an optional embodiment, the anti-falling connecting column comprises a sleeve, a first fitting column and a second fitting column; the first fitting column and the second fitting column are inserted into two ends of the sleeve, and the outer wall of the first fitting column and the second fitting column is threadedly connected with the inner wall of the sleeve; the first fitting column is connected with the anti-falling frame assembly after penetrating the limiting plate; the second fitting column is connected with the connecting rope.

[0021] In an optional embodiment, the driving mechanism comprises a cylinder and a piston rod; the cylinder is arranged on the fixed rail; the piston rod is connected with the connecting rope at the end away from the cylinder; the piston rod is connected with the cylinder to realize elongation or shortening.

[0022] In an optional embodiment, the movable sliding rail comprises a sliding block, an upper wear plate and a lower wear plate; the upper wear plate and the lower wear plate are configured to be connected with the inner side wall of the square tube in an up-down sliding manner;

[0023] The upper wear plate and the lower wear plate are arranged at two ends of the height direction of the sliding block, respectively;

[0024] Along the thickness direction of the movable sliding rail, the upper wear plate and the lower wear plate are located at two sides of the sliding block, respectively.

[0025] In an optional embodiment, the sliding block comprises two parallel arranged wing plates and a web plate connecting the two wing plates; the limiting wedge and the limiting plate are arranged on the same side of the web plate;

[0026] Along the height direction of the fixed rail, a fitting slot is arranged on the side wall of the square tube; the web plate penetrates the fitting slot.

[0027] In a second aspect, the utility model provides a lifting system, the lifting system comprises the lifting anti-falling equipment of any one of preceding embodiments.

[0028] The beneficial effects of the embodiments of the utility model include, for example:

[0029] The lifting anti-falling device comprises a fixed rail, a movable slide rail, a driving mechanism, a connecting rope and a stopping device. The driving mechanism cooperates with the connecting rope to realize the lifting of the movable slide rail, and the cargo platform plate can be connected with the movable slide rail, so that the loading and unloading of the cargo are realized. Further, the limiting wedge and the limiting plate are sequentially arranged on the movable slide rail in the height direction of the movable slide rail. The frame body of the stopping frame assembly is sleeved on the limiting wedge; the two ends of the stopping connecting column are connected with the driving mechanism and the stopping frame assembly respectively, and the stopping frame assembly can abut against the top end of the limiting wedge, so that the driving mechanism is connected with the movable slide rail and the movable slide rail is lifted. The two ends of the stopping elastic member abut against the limiting plate and the stopping frame assembly. Because the stopping elastic member is used to make the stopping frame assembly have an elastic force that is always away from the limiting plate, when the connecting rope is broken, the power transmitted from the stopping connecting column and the driving mechanism to the stopping frame assembly is removed, the stopping frame assembly at least partially moves upward along the matching inclined surface under the elastic force of the stopping elastic member, and at least part of the stopping frame assembly also abuts against the inner wall of the fixed rail square tube, so that the friction between the movable slide rail and the fixed rail is increased, the rapid descent of the movable slide rail and the cargo platform plate is slowed down, the risk caused by the breaking of the chain is reduced, and the damage to the person and the goods is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0031] Figure 1 It is a structural schematic view of the lifting anti-falling device of the embodiments of the present application.

[0032] Figure 2 It is a structural schematic view of the lifting anti-falling device of the embodiments of the present application from another perspective.

[0033] Figure 3 It is a partial sectional view of the structural schematic view of the lifting anti-falling device of the embodiments of the present application.

[0034] Figure 4 It is a structural schematic view of the sliding block of the lifting anti-falling device of the embodiments of the present application.

[0035] Figure 5 It is a structural schematic view of the movable slide rail of the lifting anti-falling device of the embodiments of the present application.

[0036] Figure 6 It is a partial structural schematic view of the movable slide rail of the lifting anti-falling device of the embodiments of the present application.

[0037] Icon: 11 - car plate; 12 - loading platform; 13 - railing; 100 - fixed rail; 110 - guide rail; 111 - square tube; 112 - matching notch; 120 - guide rail welding piece; 200 - movable slide rail; 210 - sliding block; 211 - wing plate; 212 - web plate; 220 - upper wear plate; 230 - lower wear plate; 240 - limiting wedge; 241 - matching inclined surface; 242 - top end; 243 - bottom end; 250 - limiting plate; 260 - guide plate; 300 - driving mechanism; 310 - cylinder body; 320 - piston rod; 400 - connecting rope; 500 - arresting device; 510 - arresting elastic member; 520 - arresting frame assembly; 521 - frame body; 522 - first end face; 523 - second end face; 524 - mounting groove; 530 - arresting connecting column; 531 - first matching column; 532 - second matching column; 533 - sleeve; 540 - arresting extrusion column. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0040] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0042] In addition, if the terms "first", "second" and the like are used herein, they are merely used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0043] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0044] Please refer to Figure 1 , Figure 2 and Figure 3 , the embodiment provides a kind of to promote anti-falling equipment, including fixed rail 100, movable slide rail 200, drive mechanism 300, connecting rope 400 and stop falling device 500.

[0045] One end of connecting rope 400 is connected with stop falling device 500, and the other end is connected with drive mechanism 300;Drive mechanism 300 is configured to be able to extend or shorten the length of connecting rope 400 between stop falling device 500 and drive mechanism 300, to make movable slide rail 200 realize lifting;

[0046] Fixed rail 100 includes square tube 111;Along the height direction of fixed rail 100, movable slide rail 200 is movably arranged in square tube 111;Limiting wedge block 240 and limiting plate 250 are arranged on movable slide rail 200;Limiting wedge block 240 has matching inclined surface 241, top end 242 and bottom end 243 along the height direction of movable slide rail 200;From the direction of top end 242 to bottom end 243, the thickness of limiting wedge block 240 has increasing trend, so that matching inclined surface 241 is inclined towards the bottom of movable slide rail 200;

[0047] Stop falling device 500 includes stop falling elastic member 510, stop falling frame assembly 520, stop falling connecting column 530;

[0048] One end of stop falling connecting column 530 is provided with limiting plate 250, and the other end is connected with connecting rope 400;Stop falling elastic member 510 is sleeved on stop falling connecting column 530, and one end of stop falling elastic member 510 abuts on limiting plate 250, and the other end can abut on the bottom of stop falling frame assembly 520;Stop falling elastic member 510 is configured to provide elastic force for making stop falling frame assembly 520 always away from limiting plate 250;

[0049] When connecting rope 400 breaks, stop falling frame assembly 520 moves upward along matching inclined surface 241 under the action of at least part of elastic force of stop falling elastic member 510, and at least part of stop falling frame assembly 520 moves towards the inner side wall of square tube 111, until abutting with the inner side wall of square tube 111 and generating relative friction.

[0050] The drive mechanism 300 of the anti-falling equipment of the present application cooperates with the connecting rope 400 to realize the lifting of the movable slide rail 200, and the cargo platform 12 plate can be connected with the movable slide rail 200, so as to realize the loading and unloading of the goods.

[0051] Further, along the height direction of the movable slide rail 200, a limiting wedge 240 and a limiting plate 250 are sequentially arranged on the movable slide rail 200. The frame body of the falling stopping frame assembly 520 is sleeved on the limiting wedge 240; the two ends of the falling stopping connecting column 530 are respectively connected with the driving mechanism 300 and the falling stopping frame assembly 520, and the falling stopping frame assembly 520 can abut against the top end 242 of the limiting wedge 240, so as to realize the connection between the driving mechanism 300 and the movable slide rail 200 and make the movable slide rail 200 ascend and descend.

[0052] The two ends of the falling stopping elastic member 510 abut between the limiting plate 250 and the falling stopping frame assembly 520. Because the falling stopping elastic member 510 is used to make the falling stopping frame assembly 520 have an elastic force that is always away from the limiting plate 250, when the connecting rope 400 is broken, because the power transmitted from the falling stopping connecting column 530 and the driving mechanism 300 is removed at least partially, the falling stopping frame assembly 520 at least partially moves upward along the matching inclined surface 241 under the elastic force of the falling stopping elastic member 510, and at the same time, the falling stopping frame assembly 520 at least partially abuts against the inner wall of the square tube 111 of the fixed rail 100, so as to increase the friction force between the movable slide rail 200 and the fixed rail 100, thereby slowing down the rapid descent of the movable slide rail 200 and the cargo platform 12, reducing the risk caused by the broken chain, and reducing the damage to the person and the goods.

[0053] Please continue to refer to Figures 1 to 6 to understand more structural details of the lifting and falling stopping device.

[0054] From Figure 1 and Figure 2 , it can be seen that the fixed rail 100 can be arranged on the vehicle plate 11; the cargo platform 12 can be detachably mounted on the slide rail. The cargo platform 12 is also provided with a foldable guardrail 13, and the bottom of the cargo platform 12 can also be rotated relative to the cargo platform 12 to realize folding. Optionally, the connecting rope 400 is a chain, and the falling stopping elastic member 510 is a return spring.

[0055] In the embodiment, the fixed rail 100 includes two vertically arranged guide rails 110 and a guide rail welding member 120 arranged between the two square tubes 111. Each guide rail 110 includes a square tube 111. The driving device is arranged on the guide rail welding member 120.

[0056] Optionally, each square tube 111 has a movable slide rail 200 and a falling stopping device 500 cooperating with each other. It is not difficult to understand that in other embodiments, only one of the two square tubes 111 has the movable slide rail 200 and the falling stopping device 500 cooperating with each other, and the other square tube 111 is only used for vertical sliding cooperation.

[0057] The stopper frame assembly 520 is sleeved on the limiting wedge 240, the top end 242 is opposite to the top inner wall of the stopper frame assembly 520, and the bottom end 243 is opposite to the bottom inner wall of the stopper frame assembly 520.

[0058] From Figure 2 It can be seen from the optional embodiment that the driving mechanism 300 includes a cylinder body 310 and a piston rod 320, the cylinder body 310 is arranged on the fixed rail 100, and the piston rod 320 is connected with the connecting rope 400 at one end away from the cylinder body 310; the piston rod 320 is connected with the cylinder body 310 to realize elongation or shortening. Optionally, the driving mechanism 300 can be a hydraulic cylinder structure, an air cylinder structure, and can also be a winch, which is not limited here.

[0059] In use, the driving mechanism 300 is configured to shorten the length of the connecting rope 400 between the stopper device 500 and the driving mechanism 300, so that the movable slide rail 200 can be lifted; or elongate the length of the connecting rope 400 between the stopper device 500 and the driving mechanism 300, so that the movable slide rail 200 can be lowered.

[0060] Please continue to refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 It can be seen from the figure that in the optional embodiment, the stopper frame assembly 520 further includes a frame body 521 and a stopper extrusion column 540; the stopper extrusion column 540 is rotatably arranged on the frame body 521, and the circumferential surface of the stopper extrusion column 540 can abut against the matching inclined surface 241.

[0061] When the connecting rope 400 is broken, the elastic force of the stopper elastic member 510 acts to push the frame body 521 to move upward; thereby the frame body 521 drives the stopper extrusion column 540 to move upward along the matching inclined surface 241, and at the same time, the stopper extrusion column 540 moves towards the inner side wall of the square tube 111, until the stopper extrusion column 540 abuts against the inner side wall of the square tube 111 and generates relative friction. The stopper extrusion column 540 can facilitate the stopper frame assembly 520 to move more smoothly along the matching inclined surface 241.

[0062] In the optional embodiment, the stopper extrusion column 540 includes a rolling body and a rotating shaft; the rotating shaft is arranged on the end face of the rolling body in the axial direction of the rolling body; the rotating shaft is rotatably connected with the frame body 521; the rolling body is located in the frame body 521, and the circumferential surface of the rolling body abuts against the matching inclined surface 241. The rolling body and the matching inclined surface 241 are in rolling cooperation, so that the stopper extrusion column 540 moves more smoothly.

[0063] In an optional embodiment, the frame 521 is provided with a mounting groove 524, and the rotating shaft is arranged in the mounting groove 524; the mounting groove 524 extends from the middle of the frame 521 to the end face of the frame 521 to form a mounting port. In this way, the assembly of the stopper extrusion column 540 is facilitated, and the stopper frame assembly 520 is provided with a larger movement space.

[0064] It can be understood that, in other embodiments, the rotating shaft can be arranged in the shaft hole of the frame 521. This is only an example and is not limited.

[0065] In an optional embodiment, in the same square tube 111, the frame 521 has a first end face 522 close to the side wall of the movable slide rail 200 and a second end face 523 away from the side wall of the movable slide rail 200; when the connecting rope 400 is broken, the stopper extrusion column 540 moves upward along the matching inclined surface 241, and the stopper extrusion column 540 can abut against the inner side wall of the square tube 111 and generate relative friction; the mounting port is located at the second end face 523.

[0066] In an optional embodiment, the stopper connecting column 530 includes a sleeve 533, a first matching column 531, and a second matching column 532; the first matching column 531 and the second matching column 532 are inserted into two ends of the sleeve 533, and the outer walls of the first matching column 531 and the second matching column 532 are threadedly connected with the inner wall of the sleeve 533; the first matching column 531 is connected with the stopper frame assembly 520 after penetrating through the limiting plate 250; the second matching column 532 is connected with the connecting rope 400. In this way, the distance between the connecting rope 400 and the stopper frame assembly 520 is adjusted.

[0067] In an optional embodiment, the movable slide rail 200 includes a sliding block 210, an upper wear-resistant plate 220, and a lower wear-resistant plate 230; the upper wear-resistant plate 220 and the lower wear-resistant plate 230 are configured to be in sliding connection with the inner side wall of the square tube 111 in an up-down direction; the upper wear-resistant plate 220 and the lower wear-resistant plate 230 are arranged at two ends of the sliding block 210 in a height direction; in a thickness direction of the movable slide rail 200, the upper wear-resistant plate 220 and the lower wear-resistant plate 230 are located at two sides of the sliding block 210. The upper wear-resistant plate 220 and the lower wear-resistant plate 230 can ensure smooth sliding of the movable slide rail 200 in the square tube 111.

[0068] In an optional embodiment, the sliding block 210 includes two parallel arranged wing plates 211 and a web plate 212 connecting the two wing plates 211; the limiting wedge 240 and the limiting plate 250 are arranged on the same side of the web plate 212; in a height direction of the fixed rail 100, the side wall of the square tube 111 is provided with a matching slot 112; the web plate 212 penetrates through the matching slot 112. That is, the main body of the sliding block 210 is an I-shaped steel structure.

[0069] In the optional embodiment, a guide plate 260 is further included, which is arranged between the upper wear plate 220 and the sliding block 210 and extends along the length direction of the sliding block 210. The guide plate 260 is used for guiding the movable sliding rail 200.

[0070] Principle of the anti-falling device 500:

[0071] Normally, the chain forms a closed loop, and the chain is extended to realize the lifting and is retracted to realize the descending. At this time, the frame 521 is pulled tightly on the limiting wedge 240 of the movable sliding rail 200 due to the gravity.

[0072] When the chain is broken, the anti-falling elastic member 510 rebounds due to the instantaneous removal of the gravity, drives the frame 521 and the anti-falling extrusion column 540 to move upward, causes the anti-falling extrusion column 540 to move along the matching inclined surface 241 of the limiting wedge 240 of the movable sliding rail 200, so that the anti-falling extrusion column 540 moves and abuts against the inner wall of the square tube 111 of the fixed rail 100 while moving upward, and the friction force is increased, so that the rapid descending of the movable sliding rail 200 and the plate of the cargo platform 12 can be slowed down, the risk caused by the chain breaking is reduced, and the damage to the person and the goods is reduced.

[0073] In the second aspect, the utility model provides a lifting system, the lifting system includes the lifting anti-falling equipment of any preceding embodiment.

[0074] In summary, the utility model embodiment provides a lifting anti-falling equipment and a lifting system, at least has the following advantages:

[0075] When the connecting rope 400 is broken, the power transmitted by the anti-falling connecting column 530 and the driving mechanism 300 to the anti-falling frame assembly 520 is removed, the anti-falling extrusion column 540 moves upward along the matching inclined surface 241 under the elastic force of the anti-falling elastic member 510, and the anti-falling extrusion column 540 also presses against the inner wall of the square tube 111 of the fixed rail 100, so that the friction force between the movable sliding rail 200 and the fixed rail 100 is increased, the rapid descending of the movable sliding rail 200 and the plate of the cargo platform 12 can be slowed down, the risk caused by the chain breaking is reduced, and the damage to the person and the goods is reduced.

[0076] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A hoisting and falling protection device, characterized in that, The lifting and falling prevention device comprises a fixed rail (100), a movable slide rail (200), a driving mechanism (300), a connecting rope (400) and a falling prevention device (500). One end of the connecting rope (400) is connected with the falling prevention device (500), and the other end is connected with the driving mechanism (300); the driving mechanism (300) is configured to extend or shorten the length of the connecting rope (400) between the falling prevention device (500) and the driving mechanism (300), so that the movable slide rail (200) is lifted or lowered. The fixed rail (100) comprises a square tube (111); along the height direction of the fixed rail (100), the movable slide rail (200) is movably arranged in the square tube (111); the movable slide rail (200) is provided with a limiting wedge block (240) and a limiting plate (250); the limiting wedge block (240) has a matching inclined surface (241), a top end (242) and a bottom end (243) along the height direction of the movable slide rail (200); from the top end (242) to the bottom end (243), the thickness of the limiting wedge block (240) has a trend of increasing, so that the matching inclined surface (241) is inclined towards the bottom of the movable slide rail (200). The falling prevention device (500) comprises a falling prevention elastic member (510), a falling prevention frame assembly (520) and a falling prevention connecting column (530). One end of the falling prevention connecting column (530) penetrates the limiting plate (250), and the other end is connected with the connecting rope (400); the falling prevention elastic member (510) is sleeved on the falling prevention connecting column (530), one end of the falling prevention elastic member (510) abuts against the limiting plate (250), and the other end can abut against the bottom of the falling prevention frame assembly (520); the falling prevention elastic member (510) is configured to provide an elastic force that always makes the falling prevention frame assembly (520) move away from the limiting plate (250); When the connecting rope (400) breaks, the falling prevention frame assembly (520) moves upward along the matching inclined surface (241) under the action of the elastic force of the falling prevention elastic member (510), and at least part of the falling prevention frame assembly (520) moves towards the inner side wall of the square tube (111) until abutting against the inner side wall of the square tube (111) and generating relative friction.

2. The lifting and falling prevention device according to claim 1, wherein: The falling prevention frame assembly (520) further comprises a frame body (521) and a falling prevention extrusion column (540); the falling prevention extrusion column (540) is rotatably arranged on the frame body (521), and the circumferential surface of the falling prevention extrusion column (540) can abut against the matching inclined surface (241). ​ When the connecting rope (400) is broken, the elastic force of the arresting elastic member (510) acts to push the frame body (521) to move upward; thereby the frame body (521) drives the arresting extrusion column (540) to move upward along the matching inclined surface (241), and the arresting extrusion column (540) moves towards the inner side wall of the square tube (111) until the arresting extrusion column (540) abuts against the inner side wall of the square tube (111) and generates relative friction.

3. The lifting and arresting device according to claim 2, characterized in that: the arresting extrusion column (540) comprises a rolling body and a rotating shaft; the rotating shaft is arranged on the end face of the rolling body along the axial direction of the rolling body; the rotating shaft is rotatably connected with the frame body (521); the rolling body is located in the frame body (521), and the circumferential surface of the rolling body abuts against the matching inclined surface (241).

4. The lifting and arresting device according to claim 3, characterized in that: the frame body (521) is provided with a mounting groove (524), and the rotating shaft is arranged in the mounting groove (524); the mounting groove (524) extends from the middle part of the frame body (521) to the end face of the frame body (521) to form a mounting opening.

5. The lifting and arresting device according to claim 4, characterized in that: in the same square tube (111), the frame body (521) has a first end face (522) close to the side wall of the movable slide rail (200) and a second end face (523) away from the side wall of the movable slide rail (200); when the connecting rope (400) is broken, the arresting extrusion column (540) moves upward along the matching inclined surface (241), and the arresting extrusion column (540) can abut against the inner side wall of the square tube (111) and generate relative friction; the mounting opening is located on the second end face (523).

6. The lifting and arresting device according to claim 1, characterized in that: the arresting connecting column (530) comprises a sleeve (533), a first matching column (531) and a second matching column (532); the first matching column (531) and the second matching column (532) are inserted into the two ends of the sleeve (533), and the outer wall of the first matching column (531) and the outer wall of the second matching column (532) are threadedly connected with the inner wall of the sleeve (533); the first matching column (531) is connected with the arresting frame assembly (520) after penetrating through the limiting plate (250); and the second matching column (532) is connected with the connecting rope (400).

7. The lifting and arresting device according to claim 1, characterized in that: the driving mechanism (300) comprises a cylinder body (310) and a piston rod (320); the cylinder body (310) is arranged on the fixed rail (100), and one end of the piston rod (320) away from the cylinder body (310) is connected with the connecting rope (400); and the piston rod (320) is connected with the cylinder body (310) to realize elongation or shortening.

8. The lifting and arresting device according to claim 1, characterized in that: The movable sliding rail (200) comprises a sliding block (210), an upper wear plate (220) and a lower wear plate (230); the upper wear plate (220) and the lower wear plate (230) are configured to be in sliding connection with the inner side wall of the square tube (111) in an up-down manner; The upper wear plate (220) and the lower wear plate (230) are respectively arranged at two ends of the sliding block (210) in the height direction; Along the thickness direction of the movable sliding rail (200), the upper wear plate (220) and the lower wear plate (230) are respectively located at two sides of the sliding block (210).

9. The lifting and falling prevention device according to claim 8, characterized in that: The sliding block (210) comprises two parallel arranged wing plates (211) and a web plate (212) connecting the two wing plates (211); the limiting wedge (240) and the limiting plate (250) are both arranged on the same side of the web plate (212); Along the height direction of the fixed rail (100), a matching slot (112) is arranged on the side wall of the square tube (111); the web plate (212) penetrates through the matching slot (112).

10. A lifting system, characterized in that: The lifting system comprises the lifting and falling prevention device according to any one of claims 1-9.

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