CN217680425U - Scaffold falling-preventing device - Google Patents

Abstract

The utility model provides a scaffold anti-falling device, which comprises a wall-attached support, an anti-falling block, a shifting block, a first limiting plate, a second limiting plate, a first elastic part and a second elastic part, wherein the wall-attached support is provided with a main connecting shaft extending transversely along the wall-attached support; the anti-falling block and the shifting block are both rotatably arranged on the main connecting shaft; the head end of the falling-proof block is provided with a blocking part, and the head end of the shifting block is provided with a shifting part; the upper end part of the anti-falling block is abutted against the first limiting plate; the first elastic piece is arranged between the anti-falling block and the shifting block, and the shifting part compresses the first elastic piece when rotating in the direction close to the blocking part; the second elastic piece is arranged between the lower end of the anti-falling block and the first limiting plate, and the blocking portion compresses the second elastic piece when rotating towards the lifting track direction of the scaffold. The utility model discloses a react the action through first elastic component and second elastic component drive shifting block and prevent weighing down the piece fast sensitively respectively, can realize quick accurate prevent weighing down the function.

Description

Scaffold falling-preventing device

Technical Field

The utility model relates to a architectural equipment field particularly, relates to a scaffold frame anti-falling device.

Background

The scaffold is the protective equipment of building construction process, and present scaffold has been realized following the construction progress of building and constantly promoting. However, in the lifting process and the normal use process of the scaffold, the scaffold is likely to fall accidentally due to the failure of the lifting equipment or other limiting components, so that safety accidents are caused, and the safety of construction personnel is threatened.

The existing scaffold is provided with a corresponding anti-falling block on an attached wall support of the scaffold in order to prevent accidental falling, the anti-falling block is mutually matched with a lifting track of the scaffold, the anti-falling block is stirred when the scaffold falls, and the anti-falling block is clamped on the lifting track through the gravity effect to play a role in preventing falling.

The existing anti-falling block works in a gravity mode, the reaction is slow, and the deviation is easy to occur, so that the anti-falling function is failed, and safety accidents occur.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a scaffold fall-preventing device to at least solve the problem that the fall-preventing block of the scaffold in the prior art is slow in the reaction of the gravity mode work, and the deviation is easy to occur to cause the fall-preventing function failure.

In order to achieve the above object, the utility model provides a scaffold anti-falling device, include: the wall-attached support is fixedly arranged on the outer wall of the building and is provided with a main connecting shaft extending transversely along the wall-attached support; the anti-falling block and the shifting block are both rotatably arranged on the main connecting shaft; the head end of the falling prevention block is provided with a blocking part, and the head end of the shifting block is provided with a shifting part; the anti-falling block and the shifting block are mutually overlapped together along the axial direction of the main connecting shaft so that the blocking part and the shifting part can relatively rotate along the direction of mutual approaching and can not relatively rotate along the direction of mutual distancing; the first limiting plate is fixedly arranged on the wall-attached support, and the upper end part of the anti-falling block is abutted against the first limiting plate; the second limiting plate is fixedly arranged on the wall-attached support; the first elastic piece is arranged between the anti-falling block and the shifting block, and the shifting part compresses the first elastic piece when rotating in the direction close to the blocking part; the second elastic piece is arranged between the lower end part of the anti-falling block and the first limiting plate, and the blocking part compresses the second elastic piece when rotating towards the lifting track direction of the scaffold; when the lifting track of the scaffold rises, the shifting block is shifted by the small cross rod to rotate upwards so as to compress the first elastic piece; when the small cross rod is separated from the shifting part, the first elastic piece drives the shifting block to return to the initial position; when the lifting track of the scaffold falls down, the shifting block is shifted through the small cross rods to drive the anti-falling block to synchronously rotate downwards, and the lower end of the anti-falling block compresses the second elastic piece and is clamped on the second limiting plate so that the blocking part is clamped between two adjacent small cross rods of the lifting track to prevent the lifting track from falling down.

Furthermore, the tail end of the shifting block is provided with a hinged part, and the front end surface of the falling prevention block is provided with an accommodating groove; the hinge part is positioned in the accommodating groove so that the anti-falling block and the shifting block are mutually overlapped; the main connecting shaft penetrates through the middle part and the hinged part of the anti-falling block so that the anti-falling block and the shifting block can be rotatably arranged on the main connecting shaft.

Furthermore, the bottom surface of holding tank is planar structure, and the bottom of articulated portion is planar structure and with the mutual butt of the bottom surface of holding tank so that block portion and toggle portion can be along the direction relative rotation that is close to each other and can not be along the direction relative rotation that is kept away from each other.

Further, the width of the receiving groove in the lateral direction matches the width of the hinge.

Furthermore, a first pin shaft parallel to the main connecting shaft is fixedly arranged in the accommodating groove, and the first elastic element is a torsion spring; wherein, first elastic component cover is established on first round pin axle, and two link of first elastic component correspond the butt with blocking part and stirring portion respectively.

Furthermore, a second pin shaft parallel to the main connecting shaft is arranged on the wall-attached support, and the second elastic part is a torsion spring; wherein, the second elastic component cover is established at the second round pin epaxially, and two link of second elastic component correspond the butt with the lower tip and the first limiting plate that prevent weighing down the piece respectively.

Further, the blocking part and the poking part are both wedge-shaped structures.

Furthermore, the wall-attached support comprises a fixed seat, two triangular connecting frames and two main mounting plates, wherein the fixed seat is used for being fixedly connected with the outer wall of the building; the main connecting shaft is transversely arranged between the two main mounting plates in a penetrating manner; the two ends of the first limiting plate are correspondingly and vertically connected with the two main mounting plates.

Further, scaffold anti-falling device still includes: the lower end part of the top support is hinged between the two main mounting plates; the upper end of the top support is provided with a support head; wherein, set up main tributary supporting groove and auxiliary stay groove on the support head, main tributary supporting groove and auxiliary stay groove interval set up from top to bottom.

Furthermore, the wall-attached support also comprises two auxiliary mounting plates which are correspondingly and detachably arranged on the front end surfaces of the two main mounting plates; scaffold frame anti-falling device still includes: the two pairs of track limiting wheels are oppositely arranged on the two auxiliary mounting plates and are used for being embedded into the two guide sliding grooves of the lifting track in a sliding mode so as to limit the lifting track to ascend or descend along the vertical direction.

The utility model discloses a scaffold anti-falling device of technical scheme includes attaches wall support, prevents weighing down piece, shifting block, first limiting plate, second limiting plate, first elastic component and second elastic component, attaches wall support and is used for fixed mounting on the building outer wall, is provided with the main connecting axle along its horizontal extension on attaching wall support; the anti-falling block and the shifting block are both rotatably arranged on the main connecting shaft; the head end of the falling-proof block is provided with a blocking part, and the head end of the shifting block is provided with a shifting part; the anti-falling block and the shifting block are mutually overlapped together along the axial direction of the main connecting shaft so that the blocking part and the shifting part can relatively rotate along the direction close to each other and cannot relatively rotate along the direction far away from each other; the first limiting plate is fixedly arranged on the wall-attached support, and the upper end part of the anti-falling block is abutted against the first limiting plate; the second limiting plate is fixedly arranged on the wall-attached support; the first elastic piece is arranged between the anti-falling block and the shifting block, and the shifting part compresses the first elastic piece when rotating in the direction close to the blocking part; the second elastic piece is arranged between the lower end part of the anti-falling block and the first limiting plate, and the blocking part compresses the second elastic piece when rotating towards the lifting track direction of the scaffold; when the lifting track of the scaffold rises, the shifting block is shifted by the small cross rod to rotate upwards so as to compress the first elastic piece; when the small cross rod is separated from the shifting part, the first elastic piece drives the shifting block to return to the initial position; when the lifting track of the scaffold falls, the shifting block is shifted through the small cross rods to drive the falling prevention block to synchronously rotate downwards, and the lower end of the falling prevention block compresses the second elastic piece and is clamped on the second limiting plate so that the blocking part is clamped between two adjacent small cross rods of the lifting track to prevent the lifting track from falling. The utility model discloses a scaffold frame anti-falling device is through setting up mutually independent prevent weighing down piece and shifting block to respectively through first elastic component and second elastic component drive shifting block and prevent weighing down the quick sensitive action that reacts of piece, can realize quick accurate prevent weighing down the function. The anti-falling device solves the problems that in the prior art, the anti-falling block of the scaffold works slowly in a gravity mode, and deviation is easy to occur, so that the anti-falling function is disabled.

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 side view of an alternative anti-fall device for a scaffold according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 is a schematic perspective view of an alternative anti-fall device for a scaffold according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a front side structure of an alternative anti-fall device for a scaffold according to an embodiment of the invention;

fig. 5 is a schematic partial top view of an alternative anti-fall device for a scaffold according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a wall-attached support; 11. a fixed seat; 12. a triangular connecting frame; 13. a main mounting plate; 14. an auxiliary mounting plate; 20. a main connecting shaft; 30. an anti-falling block; 31. a blocking portion; 32. accommodating grooves; 40. shifting blocks; 41. a toggle part; 42. a hinge portion; 50. a first limit plate; 60. a second limiting plate; 70. a first elastic member; 80. a second elastic member; 90. a first pin shaft; 100. a second pin shaft; 110. supporting; 111. a support head; 112. a main supporting groove; 113. a sub-support groove; 120. a track limiting wheel.

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.

As shown in fig. 1 to 3, the anti-falling device for scaffold according to the embodiment of the present invention includes a wall-attached support 10, an anti-falling block 30, a shifting block 40, a first limiting plate 50, a second limiting plate 60, a first elastic member 70 and a second elastic member 80, wherein the wall-attached support 10 is used for being fixedly installed on a building outer wall, and the wall-attached support 10 is provided with a main connecting shaft 20 extending transversely along the wall-attached support 10; the anti-falling block 30 and the shifting block 40 are both rotatably arranged on the main connecting shaft 20; the head end of the falling-proof block 30 is provided with a blocking part 31, and the head end of the shifting block 40 is provided with a shifting part 41; the falling prevention block 30 and the dial block 40 are overlapped with each other in the axial direction of the main connecting shaft 20 so that the blocking portion 31 and the dial portion 41 can relatively rotate in the direction approaching to each other and cannot relatively rotate in the direction away from each other; the first limiting plate 50 is fixedly arranged on the wall-attached support 10, and the upper end part of the anti-falling block 30 is abutted against the first limiting plate 50; the first elastic piece 70 is arranged between the anti-falling block 30 and the shifting block 40, and the shifting part 41 compresses the first elastic piece 70 when rotating in the direction close to the blocking part 31; the second elastic member 80 is arranged between the lower end of the fall preventing block 30 and the first limiting plate 50, and the second elastic member 80 is compressed when the blocking part 31 rotates towards the lifting track direction of the scaffold; when the lifting rail of the scaffold ascends, the shifting block 40 is shifted by the small cross bar to rotate upwards so as to compress the first elastic piece 70; when the small cross bar is separated from the toggle part 41, the first elastic part 70 drives the toggle block 40 to return to the initial position; when the lifting track of the scaffold descends, the shifting block 40 is shifted through the small cross bars to drive the falling prevention block 30 to synchronously rotate downwards, and the lower end of the falling prevention block 30 compresses the second elastic piece 80 and is clamped on the second limiting plate 60, so that the blocking part 31 is clamped between two adjacent small cross bars of the lifting track to prevent the lifting track from descending. The utility model discloses a scaffold frame anti-falling device prevents weighing down piece 30 and shifting block 40 through setting up mutual independence to respectively through first elastic component 70 and second elastic component 80 drive shifting block 40 and prevent weighing down piece 30 and react the action sensitively fast, can realize accurate quick function of preventing weighing down. The anti-falling block solves the problems that in the prior art, the anti-falling block 30 of the scaffold works slowly in a gravity mode, and deviation is easy to occur, so that the anti-falling function is invalid.

In specific implementation, as shown in fig. 3 to 5, the wall-attached support 10 includes a fixed seat 11, two triangular connecting frames 12 and two main mounting plates 13, the fixed seat 11 is a rectangular frame structure, the fixed seat 11 is fixedly connected with an outer wall of a building through a connecting bolt, the two triangular connecting frames 12 are parallel to each other along a transverse direction, one end of each of the two triangular connecting frames 12 is connected with the fixed seat 11, and the two main mounting plates 13 are oppositely arranged at the other ends of the two triangular connecting frames 12; the two main mounting plates 13 are both of L-shaped angle steel structures, the short sides of the two main mounting plates 13 are opposite along the transverse direction, and the main connecting shaft 20 transversely penetrates through shaft holes in the short sides of the two main mounting plates 13 and is fixed; as shown in fig. 1, the first limiting plate 50 is located above the main connecting shaft 20, and two ends of the first limiting plate 50 are vertically connected to the two main mounting plates 13 correspondingly; two ends of the second limiting plate 60 are correspondingly connected with the two triangular connecting frames 12 and are opposite to the rear end part of the anti-falling block 30. The front end face of the anti-falling block 30 is provided with an accommodating groove 32, the tail end of the shifting block 40 is provided with a hinged part 42, and the hinged part 42 is positioned in the accommodating groove 32 so that the anti-falling block 30 and the shifting block 40 are mutually overlapped; the middle part and the hinged part 42 of the anti-falling block 30 are both provided with shaft holes matched with the outer diameter of the main connecting shaft 20, and the shaft holes of the anti-falling block 30 transversely penetrate through the accommodating groove 32; the main connecting shaft 20 passes through the anti-falling block 30 and the shaft hole of the hinge part 42 so that the anti-falling block 30 and the shifting block 40 can rotate around the main connecting shaft 20; the rear side wall of the upper end part of the anti-falling block 30 is abutted against the front side wall of the first limiting plate 50, so that the anti-falling block 30 cannot rotate anticlockwise and can only rotate clockwise. The position near the rear part of the bottom surface of the accommodating groove 32 is of an arc structure, and the hinge part 42 is of an annular structure matched with the arc structure, so that the hinge part 42 can rotate relative to the anti-falling block 30; the position of holding tank 32 bottom surface near the front side is planar structure, thereby articulated portion 42 bottom is also planar structure and makes toggle portion 41 can only rotate certain angle along the counter-clockwise with the mutual butt of bottom surface of holding tank 32 towards barrier portion 31, and shifting block 40 can not prevent falling block 30 and rotate along the clockwise alone relatively, can only drive and prevent falling block 30 and rotate along clockwise synchronous.

The transverse width of the anti-falling block 30 is matched with the distance between the short sides of the two main mounting plates 13, so that the transverse position of the anti-falling block 30 can be limited; the width of the receiving slot 32 in the transverse direction matches the width of the hinge portion 42 so that the transverse position of the paddle 40 can be defined.

Further, a first pin 90 parallel to the main connecting shaft 20 is fixedly arranged in the accommodating groove 32, a second pin 100 parallel to the main connecting shaft 20 is arranged between the two main mounting plates 13 of the wall-attached support 10, and both the first elastic element 70 and the second elastic element 80 are torsion springs; the first elastic element 70 is sleeved on the first pin shaft 90, and two connecting ends of the first elastic element 70 are correspondingly abutted with the blocking part 31 and the toggle part 41 respectively so as to apply reverse elastic force to the toggle part 41 when the toggle part 41 rotates towards the blocking part 31 along the counterclockwise direction; optionally, the blocking portion 31 and the toggle portion 41 are both wedge-shaped structures. The second elastic element 80 is sleeved on the second pin 100, and two connecting ends of the second elastic element 80 are respectively and correspondingly abutted against the lower end part of the anti-falling block 30 and the rear side part of the first limiting plate 50, so that reverse elastic force is applied to the anti-falling block 30 when the shifting block 40 drives the anti-falling block 30 to synchronously rotate along the clockwise direction.

Further, as shown in fig. 1, 3 and 4, the scaffold fall-preventing device further comprises a top support 110, and the lower end of the top support 110 is hinged between the two main mounting plates 13 through a connecting pin shaft; the upper end of the top support 110 is provided with a support head 111; the supporting head 111 is provided with a main supporting groove 112 and an auxiliary supporting groove 113, and the main supporting groove 112 and the auxiliary supporting groove 113 are arranged at intervals up and down; the sizes of the notches of the main and auxiliary support grooves 112 and 113 are matched with the diameter of the small rail of the lifting rail, so that the scaffold is supported at a predetermined height by being caught on the small rail through the main or auxiliary support grooves 112 or 113 when the lifting rail and the scaffold are lifted to a predetermined height.

Further, as shown in fig. 4 and 5, the wall-attached support 10 further includes two sub-mounting plates 14, the sub-mounting plates 14 are also in an "L" shaped plate structure, and rear side plates of the two sub-mounting plates 14 are detachably connected with side plates of the two main mounting plates 13 correspondingly through connecting bolts, respectively; the scaffold falling prevention device further comprises two pairs of rail limiting wheels 120, the two pairs of rail limiting wheels 120 are oppositely arranged on the front side plates of the two auxiliary mounting plates 14, and the two pairs of rail limiting wheels 120 are slidably embedded into the two guide sliding grooves on the two sides of the lifting rail so as to limit the lifting rail to ascend or descend along the vertical direction.

In the actual working process, in the initial state, the upper end of the anti-falling block 30 is in a forward-tilting state, and the rear side of the blocking part 31 abuts against the first limiting plate 50; and the shifting block 40 is positioned between two adjacent small cross bars of the lifting track by the shifting part 41 under the elastic force of the first elastic piece 70. When the lifting track drives the scaffold to be normally lifted, each small cross bar of the lifting track sequentially shifts the shifting block 40 through the shifting part 41 to rotate upwards along the anticlockwise direction and compress the first elastic part 70, and in the process, the upper end part of the anti-falling block 30 is clamped by the first limiting plate 50, so that the anti-falling block 30 is always kept still; because the lifting speed of the scaffold is very slow, when one small cross bar is separated from the shifting part 41 through the position of the shifting block 40, the shifting block 40 can quickly rotate to the initial state under the elastic action of the first elastic part 70, and each small cross bar of the lifting track can not obstruct the lifting process of the scaffold by sequentially passing through the position of the shifting block 40 according to the steps. When the scaffold falls, because the speed of falling is fast, thereby shift block 40 is pushed down fast through stirring portion 41 to one of them little horizontal pole of lift track thereby make shift block 40 drive prevent weighing down piece 30 synchronous quick clockwise downwardly rotating, at this in-process, prevent weighing down the rear end compression second elastic component 80 of piece 30, thereby prevent weighing down piece 30 and rotate its back tip card when extreme position and stop rotating on second limiting plate 60, at this moment, stirring portion 41 is located between two adjacent little horizontal poles of lift track, thereby block the little horizontal pole of top in order to prevent whole lift track and scaffold continuation falling.

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 (10)

1. A scaffold fall arrest device, comprising:

the wall-attached support (10) is fixedly arranged on an outer wall of a building, and a main connecting shaft (20) extending transversely along the wall-attached support (10) is arranged on the wall-attached support;

the anti-falling block (30) and the shifting block (40), wherein the anti-falling block (30) and the shifting block (40) are both rotatably arranged on the main connecting shaft (20); the head end of the anti-falling block (30) is provided with a blocking part (31), and the head end of the shifting block (40) is provided with a shifting part (41); the anti-falling block (30) and the shifting block (40) are mutually overlapped along the axial direction of the main connecting shaft (20) so that the blocking part (31) and the shifting part (41) can relatively rotate along the direction close to each other and cannot relatively rotate along the direction far away from each other;

the first limiting plate (50) is fixedly arranged on the wall-attached support (10), and the upper end part of the anti-falling block (30) is abutted against the first limiting plate (50);

the second limiting plate (60) is fixedly arranged on the wall-attached support (10);

a first elastic member (70) disposed between the falling prevention block (30) and the dial block (40), the dial portion (41) compressing the first elastic member (70) when rotated in a direction approaching the stopper portion (31);

a second elastic member (80) provided between the lower end of the fall prevention block (30) and the first stopper plate (50), the second elastic member (80) being compressed when the stopper (31) rotates in a direction of a lifting rail of the scaffold;

when the lifting track of the scaffold ascends, the shifting block (40) is shifted by the small cross bar to rotate upwards so as to compress the first elastic piece (70); when the small cross bar is separated from the shifting part (41), the first elastic piece (70) drives the shifting block (40) to return to the initial position; the lifting track of scaffold frame is stirred through little horizontal pole when tenesmus shifting block (40) is in order to drive prevent weighing down piece (30) synchronous downwardly rotating, the lower extreme compression of preventing weighing down piece (30) second elastic component (80) and card are in so that stop part (31) card is gone into two adjacent in lifting track between the little horizontal pole in order to prevent the lifting track tenesmus.

2. The scaffold anti-falling device is characterized in that the tail end of the shifting block (40) is provided with a hinge part (42), and the front end surface of the anti-falling block (30) is provided with a containing groove (32);

wherein the hinge portion (42) is located within the receiving slot (32) to allow the fall prevention block (30) and the dial block (40) to overlap each other; the main connecting shaft (20) penetrates through the middle part of the anti-falling block (30) and the hinged part (42) so that the anti-falling block (30) and the shifting block (40) are rotatably arranged on the main connecting shaft (20).

3. The scaffold fall arrest device according to claim 2, characterized in that the bottom surface of the receiving groove (32) is of planar configuration and the bottom of the hinge portion (42) is of planar configuration and abuts against the bottom surface of the receiving groove (32) to enable relative rotation of the blocking portion (31) and the toggle portion (41) in a direction towards each other and in a direction away from each other.

4. The scaffold fall arrest device according to claim 2, characterized in that the width of the receiving groove (32) in the transverse direction matches the width of the hinge (42).

5. The scaffold fall arrest device according to claim 2, characterized in that a first pin (90) is fixedly arranged in the receiving groove (32) parallel to the main connection axis (20), the first elastic member (70) being a torsion spring;

the first elastic piece (70) is sleeved on the first pin shaft (90), and two connecting ends of the first elastic piece (70) are correspondingly abutted against the blocking portion (31) and the shifting portion (41) respectively.

6. The scaffold fall-prevention device according to claim 1, wherein a second pin (100) parallel to the main connecting shaft (20) is arranged on the wall-attached support (10), and the second elastic member (80) is a torsion spring;

the second elastic piece (80) is sleeved on the second pin shaft (100), and two connecting ends of the second elastic piece (80) are respectively abutted against the lower end of the anti-falling block (30) and the first limiting plate (50) correspondingly.

7. The scaffold fall arrest device according to claim 1, characterized in that the blocking part (31) and the toggle part (41) are both wedge shaped structures.

8. The scaffold anti-falling device according to claim 1, wherein the wall-attached support (10) comprises a fixed seat (11), two triangular connecting frames (12) and two main mounting plates (13), the fixed seat (11) is used for being fixedly connected with the outer wall of a building, one end of each triangular connecting frame (12) is connected with the fixed seat (11), and the two main mounting plates (13) are oppositely arranged at the other ends of the triangular connecting frames (12);

the main connecting shaft (20) is transversely arranged between the two main mounting plates (13) in a penetrating manner; and two ends of the first limiting plate (50) are correspondingly and vertically connected with the two main mounting plates (13).

9. The scaffold fall arrest device according to claim 8, further comprising:

the lower end of the top support (110) is hinged between the two main mounting plates (13); the upper end of the top support (110) is provided with a support head (111);

the supporting head (111) is provided with a main supporting groove (112) and an auxiliary supporting groove (113), and the main supporting groove (112) and the auxiliary supporting groove (113) are arranged at intervals up and down.

10. The scaffold fall-prevention device according to claim 9, characterized in that the wall-attached support (10) further comprises two secondary mounting plates (14), and the two secondary mounting plates (14) are correspondingly and detachably arranged on the front end faces of the two main mounting plates (13); scaffold anti-falling device still includes:

the rail limiting wheels (120) are two pairs, the rail limiting wheels (120) are oppositely arranged on the two auxiliary mounting plates (14), and the rail limiting wheels (120) are embedded into the two guide sliding grooves of the lifting rail in a sliding manner to limit the lifting rail to ascend or descend along the vertical direction.

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