CN217206274U - Ladder hanging device - Google Patents

Abstract

The utility model provides a hang ladder device, include: the rack body is provided with a connecting part; the foldable ladder is movably arranged on the frame body, the frame body is provided with a first limiting structure and a second limiting structure at intervals along the upper direction and the lower direction, the foldable ladder can be kept in an unfolding position when being in limiting fit with the first limiting structure, and the foldable ladder can be kept in a folding position when being in limiting fit with the second limiting structure. The technical scheme of the application effectively solves the problem that a worker riding a bus is difficult to get on and off the trackless rubber-tyred vehicle in the related technology.

Description

Ladder hanging device

Technical Field

The utility model relates to a coal mine machinery particularly, relates to a hang ladder device.

Background

The upper opening and the lower opening of the tail of the trackless rubber-tyred vehicle are higher than the ground, and no step ladder is arranged, so that the trackless rubber-tyred vehicle is difficult for passengers to get on and off. If the staff want to come from the car from the top to the bottom, need jump from the car, lead to easily that the legs and feet receive the injury, cause the personal accident, influence safety in production.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a ladder hanging device to solve the problem of difficulty in the up-and-down trackless rubber-tyred vehicle for the riding staff in the related art.

In order to achieve the above object, the utility model provides a hang ladder device, include: the frame body is provided with a connecting part; the foldable ladder is movably arranged on the frame body, the frame body is provided with a first limiting structure and a second limiting structure at intervals along the upper direction and the lower direction, the foldable ladder can be kept in an unfolding position when being in limiting fit with the first limiting structure, and the foldable ladder can be kept in a folding position when being in limiting fit with the second limiting structure.

Further, hang ladder device still includes the handrail, and the upper end of handrail is connected with the upper end of support body is articulated, and the lower extreme of handrail is connected with folded cascade step through first articulated subassembly.

Furthermore, folded cascade ladder includes the ladder body and sets up in the couple of ladder body, and the couple slidable sets up in the lateral part of support body and can be spacing by first limit structure or second limit structure.

Further, the hook is arranged at the upper end of the ladder body, and the middle part of the ladder body is connected with the lower end of the frame body through the second hinge assembly.

Further, the first limiting structure comprises a first limiting piece and a second limiting piece, the first limiting piece comprises a first limiting plate and a first baffle, the second limiting piece comprises a second limiting plate and a second baffle, the first baffle and the second baffle are positioned at two sides of the ladder body, the hook comprises a first hook and a second hook oppositely arranged with the first hook, the first hook and the second hook are arranged at the back of the upper end of the ladder body at intervals, the first hook is slidably arranged along the first baffle, and the second hook is slidably arranged along the second baffle, wherein the minimum distance between the first hook and the second hook is larger than the width of the ladder body, the minimum distance between the first hook and the second hook is smaller than the distance between the first baffle and the second baffle, the first limiting plate is connected below the first baffle, the second limiting plate is connected below the second baffle, the first baffle and the first limiting plate are both matched with the first hook, when the second baffle and the second limiting plate are matched with the second hook stopper, the foldable ladder is kept at the unfolding position; second limit structure detachably sets up in the support body, and second limit structure and first couple are located the rear side of first baffle, and when second limit structure and first couple backstop cooperation, folded cascade companion ladder keeps in folding position, and perhaps when second limit structure and second couple are located the rear side of second baffle, and when second limit structure and second couple backstop cooperation, folded cascade companion ladder keeps in folding position.

Further, second limit structure and first couple are located the rear side of first baffle, and second limit structure can cooperate with first couple backstop, and the lateral part of support body is provided with the jack, and second limit structure includes the spacer pin, and the spacer pin can break out in the jack and can cooperate with first couple backstop with inserting.

Furthermore, the end part of the limiting pin is connected to the frame body through a connecting chain; the backstop board that can swing ground and be provided with on the support body, the spacer pin is worn out in the jack, and the backstop board shelters from in the tip and the jack of spacer pin.

Further, the first hinge assembly comprises a hinge rod, a first hinge shaft penetrating the first end of the hinge rod and the lower end of the handrail, a second hinge shaft penetrating the second end of the hinge rod and the foldable step ladder, and the second hinge assembly comprises a hinge plate, a third hinge shaft penetrating the first end of the hinge plate and the middle of the step ladder body, and a fourth hinge shaft penetrating the second end of the hinge plate and the lower end of the frame body.

Furthermore, the ladder body comprises a plurality of pedals which are arranged at intervals along the up-down direction, the hook is arranged on the side wall of the uppermost pedal, and one pedal is provided with a handle; the connecting portion includes first connecting hole and second connecting hole that the interval set up.

Further, the support body includes first upright beam and the second upright beam that sets up along left and right directions interval, and the support body still includes and sets up a plurality of crossbeams between first upright beam and the second upright beam at interval, and foldable ladder is collapsible to be set up in first upright beam and second upright beam, and first limit structure sets up in first upright beam and second upright beam, and second limit structure sets up in first upright beam or second upright beam.

Use the technical scheme of the utility model, hang the ladder device and include: support body and folded cascade ladder. The frame body is provided with a connecting part. The frame body can be connected to the upper opening and the lower opening of the tail of the trackless rubber-tyred vehicle through the connecting part. The foldable ladder is movably arranged on the frame body, and the frame body is further provided with a first limiting structure and a second limiting structure at intervals along the up-down direction. When the staff who rides need the rubber tyer of trolley-bus from top to bottom, folded cascade step ladder can keep expanding the position when folded cascade step ladder and the spacing cooperation of first limit structure, has made things convenient for the staff to ride from folded cascade step ladder from top to bottom, has standardized personnel's action, has reduced the injured possibility of foot and leg, is favorable to protecting personal safety, has improved efficiency. Therefore, the technical scheme of the application can solve the problem that a passenger gets on or off the trackless rubber-tyred vehicle difficultly in the related art. Folded cascade ladder can keep in folding position when the spacing cooperation of folded cascade ladder and second limit structure, and the trackless rubber-tyred car of being convenient for transports electromechanical device, has reduced electromechanical device transportation accident's emergence, has ensured transportation safety.

Drawings

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

fig. 1 shows an exploded structural schematic view of an embodiment of a hanging ladder device according to the present invention;

figure 2 shows a perspective view of the escalator installation of figure 1, when it is held in the deployed position;

figure 3 shows a perspective view of the escalator installation of figure 1 held in a folded position.

Wherein the figures include the following reference numerals:

10. a frame body; 11. a first connection hole; 12. a second connection hole; 13. a first vertical beam; 14. a second vertical beam; 15. a cross beam; 16. a jack; 21. a first limit structure; 211. a first limit plate; 212. a second limiting plate; 22. a second limit structure; 221. a spacing pin; 30. a foldable ladder; 31. hooking; 311. a first hook; 312. a second hook; 32. a ladder body; 321. a pedal; 322. a handle; 40. a handrail; 51. a first baffle plate; 52. a second baffle; 53. a connecting chain; 54. a backstop plate; 61. a hinge rod; 71. and (5) hinging the plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in fig. 1 to 3, the ladder hanging device of the present embodiment includes: a frame body 10 and a foldable ladder 30. The frame body 10 is provided with a connecting portion. The foldable ladder 30 is movably disposed on the frame body 10. The frame body 10 is provided with first limit structure 21 and second limit structure 22 along upper and lower direction still at interval, and folded cascade ladder 30 can keep unfolding the position when folded cascade ladder 30 and first limit structure 21 spacing cooperation, and folded cascade ladder 30 can keep folding the position when folded cascade ladder 30 and second limit structure 22 spacing cooperation.

By applying the technical scheme of this embodiment, the frame body 10 is provided with the connecting portion. The frame body 10 can be connected to the upper and lower ports of the tail of the trackless rubber-tyred vehicle through the connecting part. The foldable ladder 30 is movably disposed on the frame 10, and the frame 10 is further provided with a first limiting structure 21 and a second limiting structure 22 at an interval along the up-down direction. When the staff of riding needs to go up and down the trackless rubber-tyred car, folded cascade step 30 can keep in the expansion position when folded cascade step 30 and the spacing cooperation of first limit structure 21, has made things convenient for the staff to ride from folded cascade step 30 up and down, has standardized personnel's action, has reduced the injured possibility of foot and leg, is favorable to protecting personal safety, has improved efficiency. Therefore, the technical scheme of the embodiment can solve the problem that riding workers are difficult to get on and off the trackless rubber-tyred vehicle in the related art. Folded cascade ladder 30 can keep in the folding position when the spacing cooperation of folded cascade ladder 30 and second limit structure 22, and it is convenient to use, and the trackless rubber-tyred car of also being convenient for transports electromechanical device, has reduced electromechanical device transportation accident's emergence, has ensured transportation safety.

The distance between the upper opening and the lower opening of the tail of the trackless rubber-tyred vehicle and the ground is about 1 m.

As shown in fig. 1 to 3, the ladder hanging device further includes a handrail 40. The upper end of the handrail 40 is hinged with the upper end of the frame body 10, and the lower end of the handrail 40 is connected with the foldable ladder 30 through a first hinge assembly. The arrangement of the handrail 40 ensures the safety of the riding workers in the process of getting on and off the trackless rubber-tyred vehicle, and the foldable step ladder 30 can be pulled up to prevent the foldable step ladder 30 from falling off the frame body 10.

As shown in fig. 1 to 3, the foldable ladder 30 includes a ladder body 32 and a hook 31 provided to the ladder body 32. The hook 31 is slidably disposed at a side portion of the frame body 10 and can be limited by the first limiting structure 21 or the second limiting structure 22. Like this, couple 31 can hang on the lateral part of support body 10, prevents that ladder body 32 from dropping from support body 10, only needs to carry on spacingly to couple 31 simultaneously, just can make folded cascade ladder 30 fold for compact structure and ingenious.

As shown in fig. 1 to 3, in order to facilitate the foldable ladder 30 to be able to be switched between the folded position and the unfolded position, a hook 31 is provided at an upper end of a ladder body 32, and a middle portion of the ladder body 32 is connected with a lower end of the frame body 10 through a second hinge assembly.

As shown in fig. 1 to 3, the first limiting structure 21 includes a first limiting member and a second limiting member. The first stopper includes a first stopper plate 211 and a first shutter 51. The second limiting member includes a second limiting plate 212 and a second shutter 52. The first barrier 51 and the second barrier 52 are positioned at both sides of the frame body 10. The hook 31 includes a first hook 311 and a second hook 312 disposed opposite to the first hook 311. The first hook 311 and the second hook 312 are disposed at intervals at the rear of the upper end of the ladder body 32, the first hook 311 is slidably disposed along the first barrier 51, and the second hook 312 is slidably disposed along the second barrier 52. When the first hook 311 crosses from the front side of the first barrier 51 to the rear side of the first barrier 51 and slides downward along the first barrier 51 to the first limiting plate 211, the second hook 312 crosses from the front side of the second barrier 52 to the rear side of the second barrier 52 and slides downward along the second barrier 52 to the second limiting plate 212, the first limiting plate 211 is connected below the first barrier 51, the second limiting plate 212 is connected below the second barrier 52, the first barrier 51 and the first limiting plate 211 are in backstop engagement with the first hook 311, and the second barrier 52 and the second limiting plate 212 are in backstop engagement with the second hook 312, the foldable ladder 30 is maintained in the unfolded position. First couple 311 upwards slides along first baffle 51, and second couple 312 upwards slides along second baffle 52, because second limit structure 22 detachably sets up in support body 10, can install second limit structure 22 in support body 10, and second limit structure 22 and first couple 311 are located the rear side of first baffle 51, and when second limit structure 22 and the backstop cooperation of first couple 311, folded cascade ladder 30 keeps in the folding position. In the process that the first hook 311 slides up and down along the first barrier 51 and the second hook 312 slides up and down along the second barrier 52, the first barrier 51 guides and stops the first hook 311, and the second barrier 52 guides and stops the second hook 312, preventing the first hook 311 and the second hook 312 from being separated from the side portion of the frame body 10.

Of course, in the embodiment not shown in the figures, when the second limiting structure and the second hook are located at the rear side of the second baffle, and the second limiting structure and the second hook are matched with the stop, the foldable ladder can be kept at the folding position.

Wherein, the minimum distance between the first hook 311 and the second hook 312 is greater than the width of the frame body 10, and the minimum distance between the first hook 311 and the second hook 312 is less than the distance between the first barrier 51 and the second barrier 52. In this way, the first hooks 311 do not interfere with the frame body 10 while passing from the front side of the first barrier 51 to the rear side of the first barrier 51, and the second hooks 312 do not interfere with the frame body 10 while passing from the front side of the second barrier 52 to the rear side of the second barrier 52.

As shown in fig. 1 to fig. 3, the second limiting structure 22 and the first hook 311 are located at the rear side of the first baffle 51, and the second limiting structure 22 can be in stop fit with the first hook 311. The side of the frame body 10 is provided with an insertion hole 16, and the second limiting structure 22 comprises a limiting pin 221, wherein the limiting pin 221 can be inserted into the insertion hole 16 and can be matched with the first hook 311 in a stopping manner. Thus, the first hook 311 slides upwards to the top of the insertion hole 16 along the first baffle 51, the second hook 312 slides upwards to the top of the insertion hole 16 along the second baffle 52, the limit pin 221 penetrates out of the insertion hole 16 and can be matched with the first hook 311 in a stopping manner, the first hook 311 is prevented from falling, meanwhile, the first hook 311 is guided and stopped by the first baffle 51, the second hook 312 is guided and stopped by the second baffle 52, and the first hook 311 and the second hook 312 are prevented from being separated from the side portion of the frame body 10, so that the foldable ladder 30 can be stably kept at the folding position.

As shown in fig. 1 to 3, in order to facilitate the insertion and extraction of the stopper pin 221 from the insertion hole 16, an end of the stopper pin 221 is connected to the frame body 10 by a connection chain 53. Thus, after the stopper pin 221 is pulled out from the insertion hole 16, the connecting chain 53 pulls the end of the stopper pin 221, so that the stopper pin 221 can be suspended and can be inserted into the insertion hole 16 again in time. In order to prevent the stop pin 221 from falling out of the insertion hole 16 when the foldable ladder 30 is held in the folded position, the retaining plate 54 is swingably provided on the frame body 10, the stop pin 221 penetrates the insertion hole 16, and the end of the stop pin 221 and the insertion hole 16 are shielded by the retaining plate 54. Thus, the retaining plate 54 shields the stopper pin 221, preventing the stopper pin 221 from being withdrawn backward out of the insertion hole 16. When the foldable ladder 30 needs to be switched from the folded position to the unfolded position, the retaining plate 54 is swung to make the retaining plate 54 recede from the stopper pin 221, so that the stopper pin 221 can be pulled out from the insertion hole 16.

As shown in fig. 1 to 3, the first hinge assembly includes a hinge rod 61, a first hinge shaft penetrating a first end of the hinge rod 61 and a lower end of the handrail 40, and a second hinge shaft penetrating a second end of the hinge rod 61 and the foldable ladder 30. The second hinge assembly includes a hinge plate 71, a third hinge shaft passing through the first end of the hinge plate 71 and the middle portion of the ladder body 32, and a fourth hinge shaft passing through the second end of the hinge plate 71 and the lower end of the frame body 10. In this way, in the process of switching the foldable ladder 30 between the folded position and the unfolded position, the lower end of the handrail 40 is conveniently rotated with respect to the foldable ladder 30, and the middle portion of the ladder body 32 is rotated with respect to the lower end of the frame body 10. The first hinge shaft, the second hinge shaft, the third hinge shaft and the fourth hinge shaft are preferably bolt pieces.

As shown in fig. 1 to 3, the ladder body 32 includes three steps 321 disposed at intervals in the up-down direction. The hook 31 is provided on the side wall of the uppermost one of the steps 321. One of the pedals 321 is provided with a handle 322. The ladder body 32 can be lifted by the handle 322, facilitating the foldable ladder 30 to be unfolded or folded. The connection portion includes first and second connection holes 11 and 12 disposed at an interval. In this way, the first bolt can connect the frame body 10 to the upper and lower ports of the tail of the trackless rubber-tyred vehicle through the first connecting hole 11 and the second bolt through the second connecting hole 12. The ladder body 32 further includes an upper frame and a lower frame welded to both sides of the three steps 321.

As shown in fig. 1 to 3, in order to provide the shelf body 10 with sufficient structural strength, the shelf body 10 includes first and second vertical beams 13 and 14 spaced apart in the left-right direction. The frame 10 further includes two cross beams 15 disposed between the first vertical beam 13 and the second vertical beam 14 at intervals, the foldable ladder 30 is foldably disposed on the first vertical beam 13 and the second vertical beam 14, the first limiting structure 21 is disposed on the first vertical beam 13 and the second vertical beam 14, and the second limiting structure 22 is disposed on the first vertical beam 13. Of course, in embodiments not shown in the figures, the second limiting structure may be provided to the second upright. Two cross beams 15 are welded at intervals between the first upright beam 13 and the second upright beam 14.

The hanging ladder device of this embodiment's light in weight is less than 30kg, wholly adopts link structure, easily folds, and the size is little, and folding step ladder is folding, and hanging ladder device width only is 0.7m, length 1.7m, highly 0.2m, portable, convenient to use, the operation is reliable. And the processing is convenient, the cost of the used processing material is low, and the method is economic and practical.

Specifically, the first vertical beam 13 and the second vertical beam 14 can both adopt 50 × 50mm square steel and have a length of 1.55m, a first baffle 51 with a length of 800mm is welded downwards at a position, which is 550mm away from the upper end, on the outer side of the first vertical beam 13, a second baffle 52 with a length of 800mm is welded downwards at a position, which is 550mm away from the upper end, on the outer side of the second vertical beam 14, the material is 10 × 30mm square steel, the first baffle 51 is aligned with the outer surface of the first vertical beam 13, the second baffle 52 is aligned with the outer surface of the second vertical beam 14, the first limiting plate 211 is welded at the lower end of the first baffle 51, and the second limiting plate 212 is welded at the lower end of the second baffle 52. Two cross beams 15 are welded at intervals between the first upright beam 13 and the second upright beam 14. A 50 x 50mm square steel with the length of 560mm is welded on a position, 30mm away from the lower end of the first vertical beam 13, of a lower cross beam 15, and the cross beam 15 is perpendicular to the first vertical beam 13 and the second vertical beam 14 and is in the same plane; the upper one of the beams 15 is located above the lower one of the beams 15 at a distance of 300 mm. Drilling a first connecting hole 11 and a second connecting hole 12 which are 12.2mm away from the upper ends of the front surfaces of the first vertical beam 13 and the second vertical beam 14 by 550 mm; the first vertical beam 13 and the second vertical beam 14 can be connected with a vertical support rod at the rear door access of the double-cab crossheading trackless rubber-tyred vehicle through two M12 bolts, so that the first vertical beam 13 and the second vertical beam 14 are fixed on the trackless rubber-tyred vehicle.

The first hinge assembly further comprises a handrail ear seat and a step ear seat, the handrail ear seat is arranged at the lower end of the handrail 40, and the step ear seat is arranged at the upper end of the foldable step 30. The armrest 40 is made of two steel pipes with the diameter of 20mm and the length of 1.5M, the upper end of the armrest 40 is processed into a quarter circular arc with the radius of 100mm, a through hole 211 with the diameter of 12.2mm is drilled on the side of the upper end, and the through hole is connected with lug seats on two sides of the upper end of the frame body 10 through M12 bolts. The lower part of the lower end head of the handrail 40 is respectively welded with a handrail ear seat and is processed and manufactured by 40 multiplied by 4mm iron plates. The hinge rod 61 is made of two steel pipes with the diameter of 20mm and the length of 500mm, through holes with the diameter of 12.2mm are respectively drilled at two ends of the hinge rod, one through hole is respectively connected with the two handrail lug seats through M12mm bolts, and the other through hole is respectively connected with the step lug seats through M12mm bolts.

The three pedals 321 are made of 4mm screw steel plates, and the length x width is 560 x 200 mm. The ladder body 32 further comprises a pedal frame, the pedal frame is made of 20mm square steel, and the length and the width of the pedal frame are 560mm and 200 mm. Welding the pedal frame with the bottom of the lowest pedal; the spacing between the three pedals 321 is set to within 300 mm. The upper frame at the two sides of the pedal 321 is made of 20 multiplied by 20mm square steel with the length of 700 mm; the lower connecting frame is made of square steel with the length of 700mm and the thickness of 50 multiplied by 50 mm. The included angle between each pedal 321 and the upper frame or the lower frame is 45 degrees, and the lug seat of the step ladder is made of 40 multiplied by 4mm iron plates. The first hook 311 and the second hook 312 are both made of round steel with the diameter of 16mm, can clamp the first limiting structure, and are provided with a gap of 0.5 mm. A phi 12.2mm through hole is drilled in the position 15mm outside the lower end of the frame body 10, a phi 12.2mm hole is drilled in one end of the hinge plate 71 and is connected with the through hole in the frame body 10 through an M12 bolt, so that the foldable ladder 30 and the frame body 10 are connected into a whole, the pedal at the lowest end is about 200mm away from the ground, when the foldable ladder is not used, the foldable ladder 30 is pulled up, the foldable ladder 30 is kept at the unfolding position, and at this time, the foldable ladder 30 is hung at the highest position.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the directional terms such as "front, back, upper, lower, left, right", "horizontal, vertical, horizontal" and "top, bottom", etc. are usually based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, and in the case of not making a contrary explanation, these directional terms do not indicate and imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore, should not be construed as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

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 ladder hanging device is characterized by comprising:

the rack body (10), wherein a connecting part is arranged on the rack body (10);

foldable ladder (30), movably set up in support body (10), support body (10) are provided with first limit structure (21) and second limit structure (22) along upper and lower direction still at the interval, foldable ladder (30) with during first limit structure (21) spacing cooperation foldable ladder (30) can keep in the position of expandeing, foldable ladder (30) with during second limit structure (22) spacing cooperation foldable ladder (30) can keep in the folding position.

2. The escalator arrangement according to claim 1, characterized in that it further comprises handrails (40), the upper ends of said handrails (40) being hingedly connected to the upper end of said frame (10), the lower ends of said handrails (40) being connected to said foldable ladder (30) by means of first hinge assemblies.

3. The ladder hanging device according to claim 2, wherein the foldable ladder (30) comprises a ladder body (32) and a hook (31) arranged on the ladder body (32), the hook (31) is slidably arranged on the side of the frame body (10) and can be limited by the first limiting structure (21) or the second limiting structure (22).

4. Ladder hanging device according to claim 3, characterised in that said hook (31) is arranged at the upper end of said ladder body (32), the middle part of said ladder body (32) being connected to the lower end of said frame (10) by means of a second hinge assembly.

5. Ladder hanging device according to claim 4,

the first limiting structure (21) comprises a first limiting part and a second limiting part, the first limiting part comprises a first limiting plate (211) and a first baffle (51), the second limiting part comprises a second limiting plate (212) and a second baffle (52), the first baffle (51) and the second baffle (52) are positioned at two sides of the frame body (10), the hook (31) comprises a first hook (311) and a second hook (312) oppositely arranged with the first hook (311), the first hook (311) and the second hook (312) are arranged at the back of the upper end of the ladder body (32) at intervals, the first hook (311) is arranged along the first baffle (51) in a sliding way, and the second hook (312) is arranged along the second baffle (52) in a sliding way, wherein the minimum distance between the first hook (311) and the second hook (312) is larger than the width of the frame body (10), and a minimum distance between the first hook (311) and the second hook (312) is smaller than a distance between the first barrier (51) and the second barrier (52),

the first limit plate (211) is connected below the first baffle (51), the second limit plate (212) is connected below the second baffle (52), the first baffle (51) and the first limit plate (211) are in stop fit with the first hook (311), and when the second baffle (52) and the second limit plate (212) are in stop fit with the second hook (312), the foldable ladder (30) is kept at the unfolded position;

the second limiting structure (22) is detachably arranged on the frame body (10), the second limiting structure (22) and the first hook (311) are located on the rear side of the first baffle (51), when the second limiting structure (22) is matched with the first hook (311) in a stopping mode, the foldable ladder (30) is kept in the folding position, or when the second limiting structure (22) and the second hook (312) are located on the rear side of the second baffle (52), and when the second limiting structure (22) is matched with the second hook (312) in a stopping mode, the foldable ladder (30) is kept in the folding position.

6. The ladder hanging device as claimed in claim 5, wherein the second limiting structure (22) and the first hook (311) are located at the rear side of the first baffle (51), the second limiting structure (22) can be matched with the first hook (311) in a stopping manner, a jack (16) is arranged at the side of the frame body (10), the second limiting structure (22) comprises a limiting pin (221), and the limiting pin (221) can be inserted into the jack (16) in a plugging manner and can be matched with the first hook (311) in a stopping manner.

7. The ladder hanging device as claimed in claim 6,

the end part of the limiting pin (221) is connected to the frame body (10) through a connecting chain (53);

the anti-backing plate (54) is arranged on the frame body (10) in a swinging mode, the limiting pin (221) penetrates through the jack (16), and the anti-backing plate (54) is shielded at the end portion of the limiting pin (221) and the jack (16).

8. The ladder hanging device as claimed in claim 4, wherein the first hinge assembly comprises a hinge rod (61), a first hinge shaft passing through the first end of the hinge rod (61) and the lower end of the handrail (40), and a second hinge shaft passing through the second end of the hinge rod (61) and the foldable ladder (30), and the second hinge assembly comprises a hinge plate (71), a third hinge shaft passing through the first end of the hinge plate (71) and the middle of the ladder body (32), and a fourth hinge shaft passing through the second end of the hinge plate (71) and the lower end of the frame body (10).

9. Ladder hanging device according to claim 3,

the ladder body (32) comprises a plurality of pedals (321) which are arranged at intervals along the vertical direction, the hook (31) is arranged on the side wall of the uppermost pedal (321), and a handle (322) is arranged on one pedal (321);

the connecting part comprises a first connecting hole (11) and a second connecting hole (12) which are arranged at intervals.

10. The ladder hanging device according to any one of claims 1 to 9, wherein the frame body (10) comprises a first vertical beam (13) and a second vertical beam (14) which are arranged at intervals in the left-right direction, the frame body (10) further comprises a plurality of cross beams (15) which are arranged between the first vertical beam (13) and the second vertical beam (14) at intervals, the foldable ladder (30) is foldably arranged on the first vertical beam (13) and the second vertical beam (14), the first limiting structure (21) is arranged on the first vertical beam (13) and the second vertical beam (14), and the second limiting structure (22) is arranged on the first vertical beam (13) or the second vertical beam (14).

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