CN213742227U

CN213742227U - Lifting scaffold unit with anti-falling function

Info

Publication number: CN213742227U
Application number: CN202022024409.0U
Authority: CN
Inventors: 黄开友; 黄婷; 黄泰杰; 黄泰潆
Original assignee: Shaanxi Kaiyou Industry Co ltd
Current assignee: Shaanxi Kaiyou Industry Co ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2021-07-20
Anticipated expiration: 2030-09-15

Abstract

The utility model provides a lifting scaffold unit with anti-falling function, which comprises a wall-attached support, a main frame, a lifting track, an electric chain guide mechanism and an anti-falling mechanism, wherein the wall-attached support is arranged on the outer wall of a building; the lifting track is fixedly arranged on one side of the main frame, which faces the building outer wall, and extends along the height direction of the main frame; the lifting track is slidably arranged on the wall-attached support along the vertical direction; the electric chain guide mechanism is connected with the wall attaching support, the main frame and the lifting track so as to drive the main frame and the lifting track to synchronously ascend or descend relative to the wall attaching support; the anti-falling mechanism is arranged on the lifting track; the chain of the electric chain guide mechanism penetrates through the anti-falling mechanism, and the anti-falling mechanism is used for clamping the broken end of the chain when the chain is broken so as to prevent the main frame and the lifting track from falling. Effectively prevent the incident that the scaffold frame falls and arouses. The problem of thereby scaffold hoisting device among the prior art does not have corresponding anti-falling mechanism to lead to the scaffold to fall easily is solved.

Description

Lifting scaffold unit with anti-falling function

Technical Field

The utility model relates to a scaffold frame field particularly, relates to a lifting scaffold unit of function is prevented weighing down in area.

Background

The scaffold is a common building device in the building construction process, and for high-rise buildings, the scaffold needs to be lifted correspondingly along with the gradual rise of the building height. In the prior art, the scaffold is lifted by adopting a matched lifting device, and the existing scaffold lifting device is not provided with a corresponding anti-falling mechanism, so that the scaffold is easily caused to fall when the lifting device breaks down, and serious safety accidents occur.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a lifting scaffold unit with anti-falling function to solve at least the problem that the scaffold lifting device in the prior art does not have a corresponding anti-falling mechanism to easily cause the scaffold to fall.

In order to achieve the above object, the utility model provides a lifting scaffold unit of function is prevented weighing down in area, include: the wall-attached support is arranged on the outer wall of the building; the lifting track is fixedly arranged on one side of the main frame, which faces the building outer wall, and extends along the height direction of the main frame; the lifting track is slidably arranged on the wall-attached support along the vertical direction; the electric chain guide mechanism is connected with the wall attaching support, the main frame and the lifting track so as to drive the main frame and the lifting track to synchronously ascend or descend relative to the wall attaching support; the anti-falling mechanism is arranged on the lifting track; the chain of the electric chain guide mechanism penetrates through the anti-falling mechanism, and the anti-falling mechanism is used for clamping one broken end of the chain when the chain is broken so as to prevent the main frame and the lifting track from falling.

Further, the electronic chain guide mechanism includes: the electric hoist is arranged on the main frame; the chain wheel is arranged on the wall-attached support; the first end of the chain is fixedly wound on a winding drum of the electric hoist, and the second end of the chain passes through the anti-falling mechanism, then is wound on the chain wheel and extends to the lifting track to be connected with the lifting track; when the electric hoist works, the main frame and the lifting track are pulled by the chain to synchronously ascend or descend relative to the wall-attached support.

Further, the electronic chain guide mechanism still includes: the connecting hook is detachably hung on the wall attaching support; wherein the chain wheel is rotatably arranged on the connecting hook.

Further, the electronic chain guide mechanism still includes: and the tail end connecting piece is arranged on the lifting track, and the second end of the chain is connected with the lifting track through the tail end connecting piece.

Further, the electronic chain guide mechanism includes: the electric hoist is arranged on the main frame; the connecting hook is detachably hung on the wall attaching support; wherein, the first end of the chain is fixedly wound on the winding drum of the electric hoist, and the second end of the chain passes through the anti-falling mechanism and then is connected with the connecting hook; when the electric hoist works, the main frame and the lifting track are pulled by the chain to synchronously ascend or descend relative to the wall-attached support.

Furthermore, the anti-falling mechanism is arranged at the bottom end of the lifting track.

Further, the anti-falling mechanism comprises: the first anti-falling chain wheel and the second anti-falling chain wheel are arranged at intervals along the height direction of the lifting track; the chain passes through a gap between the first anti-falling chain wheel and the second anti-falling chain wheel and is respectively abutted against the first anti-falling chain wheel and the second anti-falling chain wheel; the chain drives the first anti-falling chain wheel and the second anti-falling chain wheel to synchronously rotate around opposite directions in the transmission process; when the chain between the electric hoist and the anti-falling mechanism is broken, the first anti-falling chain wheel and the second anti-falling chain wheel clamp the broken end of the chain to prevent the main frame and the lifting track from falling.

Further, first anti-falling chain wheel and second anti-falling chain wheel all include: the main shaft is fixedly arranged on the lifting track, a sliding hole is formed in the radial direction of the main shaft, and the sliding hole extends in the vertical direction; the limiting sliding block can be penetrated in the sliding hole in a vertical sliding manner, and two ends of the limiting sliding block are provided with first wedge-shaped limiting bulges; the rotating wheel is of a polygonal structure and can be rotatably arranged on the main shaft around the axis of the rotating wheel, a circular limiting cavity is formed in the rotating wheel, and a plurality of second limiting bulges are uniformly arranged at intervals along the circumferential side wall of the limiting cavity; wherein the chain passes through the gap between the two rotating wheels; when the chain between the electric hoist and the anti-falling mechanism is broken, one broken end of the chain drives the rotating wheel of the first anti-falling chain wheel to rotate around a first preset direction at a speed higher than a preset rotating speed and drives the rotating wheel of the second anti-falling chain wheel to rotate around a second preset direction at a speed higher than the preset rotating speed; when the rotating wheels rotate, one second limiting bulge which is rotated to the lower part of the limiting slide block is contacted with the first limiting bulge at the lower end of the limiting slide block, the limiting slide block is jacked upwards so that the first limiting bulge at the upper end of the limiting slide block is clamped and rotated to one second limiting bulge above the limiting slide block to prevent the two rotating wheels from continuously rotating, and the two rotating wheels which stop rotating clamp one end of the chain which is fractured to prevent the main frame and the lifting track from falling down.

Furthermore, the rotating wheel is of a pentagonal structure; a chain groove is formed along the circumferential edge of the rotating wheel; when the chain passes through the gap between the two rotating wheels, the chain is partially embedded into the chain grooves of the two rotating wheels.

The lifting scaffold unit with the anti-falling function, which adopts the technical scheme of the utility model, comprises a wall-attached support, a main frame, a lifting track, an electric chain guide mechanism and an anti-falling mechanism, wherein the wall-attached support is arranged on the outer wall of a building; the lifting track is fixedly arranged on one side of the main frame, which faces the building outer wall, and extends along the height direction of the main frame; the lifting track is slidably arranged on the wall-attached support along the vertical direction; the electric chain guide mechanism is connected with the wall attaching support, the main frame and the lifting track so as to drive the main frame and the lifting track to synchronously ascend or descend relative to the wall attaching support; the anti-falling mechanism is arranged on the lifting track; the chain of the electric chain guide mechanism penetrates through the anti-falling mechanism, and the anti-falling mechanism is used for clamping the broken end of the chain when the chain is broken so as to prevent the main frame and the lifting track from falling. Effectively prevent the incident that the scaffold frame falls and arouses. The problem of thereby scaffold hoisting device among the prior art does not have corresponding anti-falling mechanism to lead to the scaffold to fall easily is solved.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural view of an optional first lifting scaffold unit with an anti-falling function according to an embodiment of the present invention;

FIG. 2 is an enlarged, fragmentary structural schematic view of the fall arrest mechanism of FIG. 1;

fig. 3 is a schematic structural view of an optional second lifting scaffold unit with an anti-falling function according to an embodiment of the present invention;

FIG. 4 is an enlarged, fragmentary structural schematic view of the fall arrest mechanism of FIG. 3;

FIG. 5 is a schematic structural view of an alternative fall arrest mechanism for a lifting scaffold unit with fall arrest functionality according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of the first drop prevention sprocket or the second drop prevention sprocket of the alternative lifting scaffold unit with drop prevention according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a main shaft of a first anti-falling chain wheel or a second anti-falling chain wheel of an optional lifting scaffold unit with an anti-falling function according to the embodiment of the invention;

fig. 8 is a schematic structural diagram of a limiting slide block of a first anti-falling chain wheel or a second anti-falling chain wheel of an optional lifting scaffold unit with an anti-falling function according to the embodiment of the invention;

FIG. 9 is a schematic view of an alternative first operating state of the first and second anti-fall sprockets of a lifting scaffold unit with anti-fall function according to an embodiment of the present invention;

FIG. 10 is a schematic view of an alternative second operating condition of the first and second anti-fall sprockets of a lifting scaffold unit with anti-fall function according to an embodiment of the invention;

fig. 11 is a schematic structural view of an alternative conventional lifting scaffold unit according to an embodiment of the present invention;

fig. 12 is a partially enlarged structural view of a lower end of the lifting rail of fig. 11.

Wherein the figures include the following reference numerals:

10. a wall-attached support; 20. a main frame; 30. a lifting rail; 40. an electric chain guide mechanism; 41. an electric hoist; 42. a sprocket; 43. a chain; 44. connecting a hook; 45. a terminal connector; 50. an anti-falling mechanism; 51. a first anti-falling chain wheel; 52. a second anti-falling chain wheel; 53. a main shaft; 54. a limiting slide block; 55. a first limit protrusion; 56. a rotating wheel; 57. a second limit bulge; 58. and a chain groove.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

According to the embodiment of the present invention, the lifting scaffold unit with anti-falling function, as shown in fig. 1 and 3, comprises a wall-attached support 10, a main frame 20, a lifting track 30, an electric chain guide mechanism 40 and an anti-falling mechanism 50, wherein the wall-attached support 10 is installed on the outer wall of the building; the lifting rail 30 is fixedly installed at one side of the main frame 20 facing the outer wall of the building and extends along the height direction of the main frame 20; the lifting rail 30 is slidably mounted on the wall-attached support 10 in the vertical direction; the electric chain guide mechanism 40 is connected with the wall-attached support 10, the main frame 20 and the lifting rail 30 to drive the main frame 20 and the lifting rail 30 to synchronously ascend or descend relative to the wall-attached support 10; the anti-falling mechanism 50 is arranged on the lifting track 30; the chain 43 of the electric chain guide mechanism 40 passes through the falling prevention mechanism 50, and the falling prevention mechanism 50 is used for catching the broken end of the chain 43 when the chain 43 is broken to prevent the main frame 20 and the lifting rail 30 from falling. Effectively prevent the incident that the scaffold frame falls and arouses. The problem of thereby scaffold hoisting device among the prior art does not have corresponding anti-falling mechanism 50 and leads to the scaffold to fall easily is solved.

Example 1:

as shown in fig. 1 and 2, in the present embodiment, the electric chain guide mechanism 40 includes an electric block 41, a sprocket 42, a chain 43, a connecting hook 44 and a terminal connecting piece 45, the upper end of the electric block 41 is provided with a hook, and the electric block 41 is hung on a hanging ring of the main frame 20 through the hook; the connecting hook 44 is detachably hung on the wall attaching support 10, and the chain wheel 42 is rotatably arranged at the lower end of the connecting hook 44 through a connecting pin; a first end of the chain 43 is fixedly wound on a winding drum of the electric hoist 41, a second end of the chain 43 extends downwards, penetrates through the anti-falling mechanism 50 and then extends upwards, then winds around the chain wheel 42 and then extends downwards to the lifting track 30 and is connected with the lifting track 30 through the end connecting piece 45; when the electric hoist 41 works, the main frame 20 and the lifting rail 30 are pulled by the chain 43 to synchronously ascend or descend relative to the wall-attached support 10.

During specific installation, the anti-falling mechanism 50 is arranged at the bottom end of the lifting track 30; the electric hoist 41 is hung on the first cross bar of the main frame 20, the installation height of the electric hoist 41 is positioned between the chain wheel 42 and the anti-falling mechanism 50, and the tail end connecting piece 45 is positioned above the anti-falling mechanism 50, so that the electric chain guide mechanism 40 can be ensured to work smoothly to lift the main frame 20.

Example 2:

as shown in fig. 3 and 4, in the present embodiment, the electric chain guide mechanism 40 includes an electric block 41, a chain 43 and a connecting hook 44, the upper end of the electric block 41 is provided with a hook, and the electric block 41 is hung on the hanging ring of the main frame 20 through the hook; the connecting hook 44 is detachably hung on the wall attaching support 10; the first end of the chain 43 is fixedly wound on the winding drum of the electric hoist 41, and the second end of the chain 43 extends downwards, penetrates through the anti-falling mechanism 50 and then extends upwards to be connected with the connecting hook 44; when the electric hoist 41 works, the main frame 20 and the lifting rail 30 are pulled by the chain 43 to synchronously ascend or descend relative to the wall-attached support 10.

During specific installation, the anti-falling mechanism 50 is arranged at the bottom end of the lifting track 30; the electric hoist 41 is hung on the first cross bar of the main frame 20, and the installation height of the electric hoist 41 is located between the connecting hook 44 and the anti-falling mechanism 50, so that the electric chain guide mechanism 40 can be ensured to work smoothly to lift the main frame 20.

Further, as shown in fig. 5, the falling prevention mechanism 50 includes a first falling prevention sprocket 51 and a second falling prevention sprocket 52, and the first falling prevention sprocket 51 and the second falling prevention sprocket 52 are arranged at intervals along the height direction of the lifting track 30; wherein, the chain 43 passes through the gap between the first and second anti-falling chain wheels 51 and 52 and is respectively abutted against the first and second anti-falling chain wheels 51 and 52; the electric hoist 41 drives the chain 43 to drive the first anti-falling chain wheel 51 and the second anti-falling chain wheel 52 to synchronously rotate around opposite directions in the transmission process; when the electric hoist 41 drives the main frame 20 and the lifting track 30 to lift, the first anti-falling chain wheel 51 rotates clockwise, and the second anti-falling chain wheel 52 rotates anticlockwise; when the electric hoist 41 drives the main frame 20 and the lifting track 30 to descend, the first anti-falling chain wheel 51 rotates anticlockwise, and the second anti-falling chain wheel 52 rotates clockwise; in actual operation, the chain 43 between the electric hoist 41 and the falling prevention mechanism 50 is easily broken, and when the chain 43 between the electric hoist 41 and the falling prevention mechanism 50 is broken, the first falling prevention sprocket 51 and the second falling prevention sprocket 52 block the broken end of the chain 43 to prevent the main frame 20 and the lifting rail 30 from falling.

Specifically, as shown in fig. 6 to 8, each of the first anti-falling chain wheel 51 and the second anti-falling chain wheel 52 includes a main shaft 53, a limiting slider 54, and a rotating wheel 56, two ends of the main shaft 53 are correspondingly and fixedly connected with two channel steels of the lifting track 30, a sliding hole is formed along the radial direction of the main shaft 53, optionally, the sliding hole is a rectangular hole, and the sliding hole extends and penetrates up and down along the vertical direction; the limiting slide block 54 is of a strip structure, the limiting slide block 54 can be vertically slidably arranged in the slide hole in a penetrating manner, two ends of the limiting slide block 54 are respectively provided with a wedge-shaped first limiting bulge 55, and the two first limiting bulges 55 are vertically symmetrical; the rotating wheel 56 is of a polygonal structure, optionally, the rotating wheel 56 of this embodiment is of a pentagonal structure, the rotating wheel 56 is rotatably mounted on the main shaft 53 around an axis thereof, a circular limiting cavity is provided inside the rotating wheel 56, a plurality of second limiting protrusions 57 are uniformly arranged along a circumferential side wall of the limiting cavity at intervals, and the number of the second limiting protrusions 57 is five in this embodiment; a chain groove 58 is formed along the circumferential edge of the rotating wheels 56, and the chain 43 passes through the gap between the two rotating wheels 56, so that the chain 43 is partially embedded into the chain grooves 58 of the two rotating wheels 56.

As shown in fig. 9 and 10, when the main frame 20 and the lifting rail 30 are normally lifted or lowered by the electric block 41, one second limiting protrusion 57 rotating to the lower side of the limiting slider 54 contacts with the first limiting protrusion 55 at the lower end of the limiting slider 54 and pushes up the limiting slider 54, and since the rotation speed of the two rotating wheels 56 is slow, after the lower second limiting protrusion 57 is separated from the first limiting protrusion 55 at the lower end of the limiting slider 54, the pushed-up limiting slider 54 moves downward to the lowest position under the action of its own gravity, so that the first limiting protrusion 55 at the upper end of the limiting slider 54 does not block the upper second limiting protrusion 57, and then the process is sequentially and circularly performed.

When the chain 43 between the electric hoist 41 and the anti-falling mechanism 50 is broken, the broken end of the chain 43 drives the runner 56 of the first anti-falling chain wheel 51 to rotate around the first preset direction at a speed higher than the preset speed and drives the runner 56 of the second anti-falling chain wheel 52 to rotate around the second preset direction at a speed higher than the preset speed; the first preset direction is a counterclockwise direction, and the second preset direction is a clockwise direction; the two first limiting bulges 55 of the first anti-falling chain wheel 51 are bent towards the moving direction of the chain 43, and each second limiting bulge 57 of the first anti-falling chain wheel 51 is bent towards the anticlockwise direction; the two first limit protrusions 55 of the second drop prevention sprocket 52 are both bent toward the opposite direction of the movement of the chain 43, and each second limit protrusion 57 of the second drop prevention sprocket 52 is bent toward the clockwise direction; the second limiting protrusion 57 rotating to the lower part of the limiting slider 54 contacts with the first limiting protrusion 55 at the lower end of the limiting slider 54 and jacks up the limiting slider 54, and the jacked limiting slider 54 cannot move downwards to return to the original position because the rotating speed of the two rotating wheels 56 is slow, so that the first limiting protrusion 55 at the upper end of the limiting slider 54 blocks the second limiting protrusion 57 rotating to the upper part of the limiting slider 54 and further prevents the two rotating wheels 56 from continuing to rotate, and because each chain ring of the chain 43 is in crisscross connection, the two rotating wheels 56 stopping rotation can block one broken end of the chain 43, thereby preventing the main frame 20 and the lifting track 30 from dropping.

As shown in fig. 11 and 12, in practical use, the fall prevention mechanism 50 at the lower end of the lifting rail 30 can be modified to a common sprocket 42 for use as a common lifting scaffold unit. Thereby meeting different use requirements and reducing the manufacturing cost.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a lifting scaffold unit of function is prevented weighing down in area which characterized in that includes:

the wall-attached support (10), the wall-attached support (10) is installed on the building outer wall;

the lifting track (30) is fixedly arranged on one side, facing the building outer wall, of the main frame (20) and extends along the height direction of the main frame (20); the lifting track (30) is slidably mounted on the wall-attached support (10) along the vertical direction;

the electric chain guide mechanism (40), the wall-attached support (10), the main frame (20) and the lifting rail (30) are all connected to drive the main frame (20) and the lifting rail (30) to synchronously ascend or descend relative to the wall-attached support (10);

the anti-falling mechanism (50) is arranged on the lifting track (30);

wherein, the chain (43) of the electric chain guide mechanism (40) passes through the anti-falling mechanism (50), and the anti-falling mechanism (50) is used for blocking the broken end of the chain (43) when the chain (43) is broken so as to prevent the main frame (20) and the lifting track (30) from falling.

2. Lifting scaffold unit with fall arrest function according to claim 1, characterized in that the electrically powered chain guide mechanism (40) comprises:

an electric hoist (41) provided on the main frame (20);

a sprocket (42) disposed on the wall attachment support (10);

wherein a first end of the chain (43) is fixedly wound on a winding drum of the electric hoist (41), and a second end of the chain (43) passes through the anti-falling mechanism (50), then is wound on the chain wheel (42), extends to the lifting track (30) and is connected with the lifting track (30); when the electric hoist (41) works, the main frame (20) and the lifting track (30) are pulled by the chain (43) to synchronously ascend or descend relative to the wall-attached support (10).

3. Lifting scaffold unit with fall arrest function according to claim 2, characterized in that the electrically powered chain guide mechanism (40) further comprises:

the connecting hook (44) is detachably hung on the wall-attached support (10);

wherein the sprocket (42) is rotatably provided on the coupling hook (44).

4. Lifting scaffold unit with fall arrest function according to claim 3 characterized in that the electric chain guide mechanism (40) further comprises:

and the tail end connecting piece (45) is arranged on the lifting track (30), and the second end of the chain (43) is connected with the lifting track (30) through the tail end connecting piece (45).

5. Lifting scaffold unit with fall arrest function according to claim 1, characterized in that the electrically powered chain guide mechanism (40) comprises:

an electric hoist (41) provided on the main frame (20);

the connecting hook (44) is detachably hung on the wall-attached support (10);

wherein, a first end of the chain (43) is fixedly wound on a winding drum of the electric hoist (41), and a second end of the chain (43) passes through the anti-falling mechanism (50) and then is connected with the connecting hook (44); when the electric hoist (41) works, the main frame (20) and the lifting track (30) are pulled by the chain (43) to synchronously ascend or descend relative to the wall-attached support (10).

6. Lifting scaffold unit with fall arrest function according to claim 1, characterized in that the fall arrest mechanism (50) is arranged at the bottom end of the lifting rail (30).

7. Lifting scaffold unit with fall arrest function according to claim 2 or 5, characterized in that the fall arrest mechanism (50) comprises:

the anti-falling chain wheel structure comprises a first anti-falling chain wheel (51) and a second anti-falling chain wheel (52), wherein the first anti-falling chain wheel (51) and the second anti-falling chain wheel (52) are arranged at intervals along the height direction of the lifting track (30);

wherein the chain (43) passes through a gap between the first and second fall prevention sprockets (51, 52) and abuts against the first and second fall prevention sprockets (51, 52), respectively; the chain (43) drives the first anti-falling chain wheel (51) and the second anti-falling chain wheel (52) to synchronously rotate around opposite directions in the transmission process; electric block (41) with prevent between the weight mechanism (50) when chain (43) fracture, first prevent weighing down sprocket (51) with the second prevents weighing down sprocket (52) and blocks chain (43) break off's one end is in order to prevent main frame (20) with lifting track (30) tenesmus.

8. Lifting scaffold unit with fall arrest function according to claim 7, characterized in that the first fall arrest sprocket (51) and the second fall arrest sprocket (52) each comprise:

the main shaft (53) is fixedly arranged on the lifting track (30), a sliding hole is formed in the radial direction of the main shaft (53), and the sliding hole extends in the vertical direction;

the limiting sliding block (54) can be vertically slidably arranged in the sliding hole in a penetrating way, and both ends of the limiting sliding block (54) are provided with first wedge-shaped limiting bulges (55);

the rotating wheel (56) is of a polygonal structure, the rotating wheel (56) is rotatably arranged on the main shaft (53) around the axis of the rotating wheel, a circular limiting cavity is formed in the rotating wheel (56), and a plurality of second limiting protrusions (57) are uniformly arranged at intervals along the circumferential side wall of the limiting cavity;

wherein the chain (43) passes through a gap between the two pulleys (56); when the chain (43) between the electric hoist (41) and the anti-falling mechanism (50) is broken, the broken end of the chain (43) drives the runner (56) of the first anti-falling chain wheel (51) to rotate around a first preset direction at a speed higher than a preset speed and drives the runner (56) of the second anti-falling chain wheel (52) to rotate around a second preset direction at a speed higher than the preset speed;

when the rotating wheels (56) rotate, one second limiting protrusion (57) which rotates to the lower part of the limiting sliding block (54) is in contact with the first limiting protrusion (55) at the lower end of the limiting sliding block (54) and jacks up the limiting sliding block (54) so that the first limiting protrusion (55) at the upper end of the limiting sliding block (54) is clamped and rotated to one second limiting protrusion (57) above the limiting sliding block (54) to prevent the two rotating wheels (56) from rotating continuously, and the two rotating wheels (56) which stop rotating clamp the broken end of the chain (43) to prevent the main frame (20) and the lifting track (30) from falling down.

9. Lifting scaffold unit with fall arrest function according to claim 8 characterized in that the runner (56) is of pentagonal configuration; a chain groove (58) is formed along the circumferential edge of the rotating wheel (56);

wherein when the chain (43) passes through the gap between the two rotating wheels (56), the chain (43) is partially embedded in the chain grooves (58) of the two rotating wheels (56).