CN220769345U - Telescopic and folding guardrail ladder - Google Patents

Abstract

The utility model discloses a telescopic and folding guardrail ladder, and relates to the field of guardrail ladders. The fence ladder comprises two lower straight ladders, two upper straight ladders and a foldable ladder top platform arranged at the top ends of the two upper straight ladders, wherein the lower ends of the two lower straight ladders are supported on the ground, the upper straight ladders are in sliding connection with the lower straight ladders on the corresponding sides in the length direction, the upper straight ladders are fixed on the corresponding sides after the heights are adjusted to be in place through locking devices arranged at the upper end parts of the lower straight ladders, and the foldable ladder top platform is arranged at the top ends of the two upper straight ladders and is hinged with the top ends of the two upper straight ladders. According to the utility model, the ground operation lifting of the upper straight ladder can be realized through the upper straight ladder lifting device, the height lifting control of the ladder is flexible, the operation is simple and convenient, the modularized assembly and disassembly can be realized through the integral structure, the rapid folding, storage and rapid installation are convenient, the carrying and the transferring are convenient, the use efficiency and the storage convenience are improved, the flexible state adjustment of the ladder can be realized in the working process, the use is convenient, and the gravity center is stable and reliable.

Description

Telescopic and folding guardrail ladder

Technical Field

The utility model relates to the field of guardrail ladders, in particular to a telescopic and folding guardrail ladder.

Background

Most of the ascending maintenance ladders are simple ascending devices or are fixedly welded, the occupied space is large and heavy, or the ascending maintenance ladders are not firm enough, after the operation is completed, the ascending maintenance ladders with large size can be placed in a remote corner for storage, the occupied space is large, the ascending maintenance ladders are not easy to be placed in a storehouse for storage, the effective storage management cannot be achieved, and the whole appearance of a workshop is affected.

Some existing ladders are assembled and disassembled in a modularized mode, but the height adjustment is limited, the ladders cannot be folded in a height mode, larger storage space is occupied, storage is inconvenient, and carrying and transferring are inconvenient. The modular ascending ladder comprises a movable base, a support frame 3 and an ascending ladder 8, wherein the movable base is detachably connected with the bottom of the support frame 3, and the ascending ladder 8 is obliquely arranged on the support frame 3. The support frame 3 is the shape of falling V and the symmetry is provided with two, and the tip of support frame 3 is provided with the connecting plate, and the connecting plate passes through the bolt and is connected with the removal base. Wherein, the support frame 3 and the movable base form a non-isosceles triangle, the boarding ladder 8 is arranged on the long side of the triangle, the middle part of the support frame 3 is provided with a plurality of connecting rods 4, and a cross beam 5 is detachably connected between two corresponding connecting rods 4 with the same height. This prior art is although can realize the modularization dismantlement of certain degree, but whole height is limited, and whole support frame 3 is a triangle-shaped structure, and is folding, still occupies great parking space, and stability is also relatively poor in addition, when ascending to the peak at the ladder of ascending a height, the ladder focus appears shifting, and whole focus exists unstable risk. In addition, for some ladders with higher lifting, the problem of inconvenient adjustment exists in the height adjustment between the upper ladder and the lower ladder, when adjusting the height of the upper ladder, the position where the upper ladder and the lower ladder are combined can only be climbed to be adjusted manually, and when the height of the upper ladder is lifted, lifting adjustment needs to be respectively and simultaneously carried out in the climbing directions on two sides, namely at least two people are required to climb to the position where the upper ladder and the lower ladder are combined to be adjusted, so that the operation is inconvenient.

Disclosure of Invention

In order to solve the defects of the technology, the utility model provides a telescopic and folding guardrail ladder.

The technical scheme adopted by the utility model for realizing the technical effects is as follows:

scalable and folding guardrail ladder includes:

two lower straight ladders, the lower ends of which are supported on the ground;

the upper straight ladders are connected with the lower straight ladders on the corresponding sides in a sliding manner in the length direction, and the upper straight ladders on the corresponding sides with the heights adjusted in place are fixed through locking devices arranged at the upper end parts of the lower straight ladders;

the foldable ladder top platform is arranged at the top ends of the two upper straight ladders and articulates the top ends of the two upper straight ladders.

Preferably, in the above-mentioned telescopic and folding guardrail ladder, the foldable ladder top platform includes ladder top connection frames respectively fixed at the top ends of the two upper straight ladders and hinged at opposite sides, foldable plane work tables are arranged on the ladder top connection frames, and support connecting rods connected with the ladder struts of the upper straight ladders at left and right corners of the suspended ends of the ladder top connection frames.

Preferably, in the telescopic and folding guardrail ladder, the ladder top connecting frame is arranged on one side of the suspending end of the ladder top connecting frame, a guardrail with an n-shaped structure is arranged in the vertical direction, the upright posts on two sides of the guardrail are hinged with the suspending end of the ladder top connecting frame, a detachable tensioning device for tensioning the two guardrails is arranged between the opposite upright posts on the same side of the guardrail in the climbing direction of the ladder on two sides, and a traction connecting rod is arranged between the upright posts on the left side and the right side of the guardrail and the inner end two sides of the corresponding ladder top connecting frame.

Preferably, in the above-mentioned telescopic and folding guardrail ladder, the tensioning device includes a length-adjustable telescopic rod, a supporting hook and a ring, two ends of the telescopic rod are respectively fixed with the supporting hook, two opposite upright posts on the same side of the guardrail are respectively fixed with the ring, the supporting hook is connected and fixed in the ring, and the supporting hook is provided with a slingshot lock for closing the hook opening at the hook opening.

Preferably, in the above-mentioned telescopic and folding guardrail ladder, the ladder top connection frame includes horizontal suspensions fixed on top ends of ladder struts on both sides of the upper straight ladder, the horizontal suspensions on both sides are provided with ladder top plates at inner ends far from the suspended ends thereof, and the plane workbench is laid on the ladder top plates and on both sides of the horizontal suspensions.

Preferably, in the telescopic and folding guardrail ladder, the planar workbench comprises a plurality of straight plates which are identical in size and are hinged in sequence, and the hinges between adjacent straight plates are staggered for the first time on the upper side and the lower side of the plate surface in sequence.

Preferably, in the above telescopic and folding guardrail ladder, the number of the locking devices is two, and the locking devices are relatively fixed on the outer side surfaces of the upper ends of the two ladder struts of the lower straight ladder, so as to lock a specific lower straight ladder pedal piece of the lower straight ladder and any upper straight ladder pedal piece of the upper straight ladder after the height is adjusted in place.

Preferably, in the above-mentioned telescopic and folding guardrail ladder, the locking device includes a spring hook code elastically connected to the specific lower vertical ladder pedal member, pedal fixing seats are respectively fixed to the outer side surfaces of the upper ends of the two side ladder struts of the lower vertical ladder, two ends of the specific lower vertical ladder pedal member are arranged in the pedal fixing seats, a supporting section of the spring hook code is connected to a hollow slot in the end of the specific lower vertical ladder pedal member in a penetrating manner and is connected with a spring in the slot, two ends of the upper vertical ladder pedal member are connected to the two side ladder struts of the upper vertical ladder in a penetrating manner, and chrysanthemum through holes are formed in the outer side surfaces of the ladder struts, and hook locking ends of the spring hook code penetrate through the chrysanthemum through holes and are connected with the upper vertical ladder pedal member in a locking manner in corresponding positions.

Preferably, in the above-mentioned telescopic and folding guardrail ladder, two the guardrail encloses and closes and still is equipped with detachably revolving door on the circumferencial direction that constitutes, revolving door is including revolving door frame, establish the pillar board of revolving door frame lower part position and the window opening of upper portion position, a vertical side of revolving door frame is equipped with the revolving door axle, revolving door axle detachably rotate connect in on the corresponding side post of guardrail, another vertical side of revolving door frame pass through the keeper with the corresponding side post fixed connection of guardrail.

Preferably, in the above-mentioned telescopic and folding guardrail ladder, the outer sides of the ladder struts of the two lower straight ladders are respectively detachably hinged with at least one telescopic inclined strut with adjustable height, the lower ends of the telescopic inclined struts are provided with auxiliary sliding devices for assisting the lower straight ladders to adjust the unfolding angle, and the lower ends of the two lower straight ladders are provided with auxiliary dragging devices.

The utility model has the advantages and positive effects that: the guardrail ladder can realize that a single person can operate and lift the upper straight ladder on the ground through the upper straight ladder lifting device, the lifting control of the overall height of the ladder is flexible, the operation is simple and convenient, one person can complete the assembly and disassembly of the guardrail ladder, the whole structure can realize the rapid folding and storage and the rapid installation, the transportation and the transfer are convenient, and the use efficiency and the storage convenience are greatly improved.

Drawings

FIG. 1 is a perspective view of the present utility model;

FIG. 2 is a view showing the disassembly of the ladder top connection frame and the planar table in the disassembled state of the present utility model;

FIG. 3 is a cross-sectional view of a planar table at a hinge according to the present utility model

FIG. 4 is a view showing the structure of the hinge connection of opposite sides of two ladder top connection frames in accordance with one embodiment of the utility model;

FIG. 5 is a view showing the structure of the hinge connection of opposite sides of two ladder top connection frames in accordance with one embodiment of the utility model;

FIG. 6 is a perspective view of a collapsible ladder top platform in accordance with the present utility model;

FIG. 7 is a schematic view of a locking device according to the present utility model;

FIG. 8 is a view showing the swing door assembled to the guardrail according to the present utility model;

FIG. 9 is a block diagram of a tensioning device according to the present utility model;

FIG. 10 is a connecting structure diagram of the upper end of the telescopic inclined strut and the lower straight ladder strut;

FIG. 11 is a block diagram of an auxiliary slip device according to the present utility model;

FIG. 12 is a block diagram of the auxiliary towing apparatus according to the present utility model;

FIG. 13 is a schematic view showing the state of a plurality of telescopic diagonal struts at both sides of a lower vertical ladder according to the present utility model;

fig. 14 is a structural view of the upper and lower vertical ladders of the present utility model;

fig. 15 is a state diagram of the locking device of the present utility model for fixing the lower vertical ladder and the upper vertical ladder.

Detailed Description

For a further understanding of the utility model, reference should be made to the following drawings and to the accompanying examples which illustrate the utility model:

in the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, connected via an intermediary, or connected by communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

For a further understanding of the utility model, its features and advantages, the following examples are set forth in detail:

embodiment one:

referring to fig. 1, as shown in the drawings, an embodiment of the present utility model provides a telescopic and folding guardrail ladder, which includes: two lower straight ladders 1, two upper straight ladders 2 and a foldable ladder top platform 3. Wherein, the top of two upper straight ladders 2 is hinged and fixed through a foldable ladder top platform 3, the lower ends of two lower straight ladders 1 are supported on the ground, the upper straight ladders 2 are connected with the lower straight ladders 1 on the corresponding sides in a sliding way in the length direction, and the upper straight ladders 2 on the corresponding sides with the heights adjusted in place are fixed through a locking device 5 arranged on the upper end parts of the lower straight ladders 1. The foldable ladder top platform 3 is arranged at the top ends of the two upper straight ladders 2 and provides a construction operation platform for construction operators in the upper space. Fig. 1 is a view showing an unfolded state of the guardrail ladder according to the present utility model, wherein when the height of the upper vertical ladder 2 is required to be raised, the locking device 5 is unlocked, then the upper vertical ladder 2 on both sides is pushed upward, and after reaching a predetermined height, the upper vertical ladder 2 and the lower vertical ladder 1 are locked and fixed by the locking device 5, so that the foldable ladder top platform 3 on the top ends of the two upper vertical ladders 2 can obtain a relatively high construction height. When the construction height needs to be reduced, the locking device 5 is unlocked, the two upper straight ladders 2 are synchronously lowered to the required height, and then the lower straight ladders 1 and the lower straight ladders 1 corresponding to the two sides with the height adjusted in place are locked and fixed through the locking device 5.

Further, in the embodiment of the present utility model, as shown in fig. 1 and 2, the foldable ladder top platform 3 includes ladder top connection frames 31 respectively fixed to the top ends of the two upper straight ladders 2, and foldable plane work tables 32 are provided on the ladder top connection frames 31, and the plane work tables 32 on the two ladder top connection frames 31 can build a horizontal construction station table surface on the whole foldable ladder top platform 3. Wherein, as shown in fig. 2, the opposite sides of the two ladder top connection frames 31 are hinged by the hinge structure 36, and the two upper straight ladders 2 can be rotated and connected by the hinge of the two ladder top connection frames 31, thereby facilitating the adjustment of the unfolding angle of the ladder and the folding of the two upper straight ladders 2. As shown in fig. 1, in order to enhance the structural stability of the ladder top connection frame 31, the suspension ends of the ladder top connection frame 31 are provided with support links 35 connected to the ladder struts of the vertical ladder 2 on the corresponding sides at the left and right corners, and the stability of the ladder top connection frame 31 is further enhanced under the support of the support links 35.

Further, in the embodiment of the present utility model, as shown in fig. 1, the ladder top connection frame 31 is provided with a guard rail 33 having an n-shaped structure in a vertical direction at one side of a suspended end thereof, and the guard rail 33 provides safety protection for construction operators on the collapsible ladder top platform 3. To effect folding of the entire collapsible ladder top platform 3, the two side uprights of the railing 33 are hinged to the suspended ends of the ladder top connection frame 31 as shown in fig. 6. The folding direction of the guard rail 33 is directed to the direction of the side of the suspended end of the ladder top connecting frame 31, i.e. the climbing direction of the lower straight ladder 1 at the corresponding side, after folding, the guard rail 33 can be abutted against the ladder surface of the lower straight ladder 1 at the corresponding side, so that the space occupied by the upright guard rail 33 is reduced. In order to enhance the structural stability between the two guardrails 33 in the climbing direction of the two sides when in use, as shown in fig. 1 and 6, a tensioning device 4 is connected between the opposite upright posts of the guardrails 33 in the climbing direction of the two sides of the ladder, when in use, the two guardrails 33 are erected, then the same upright posts of the two opposite guardrails 33 are tensioned through the tensioning device 4, at the moment, the two guardrails 33 can keep stable in structure, and meanwhile, the tensioning devices 4 at the two sides can also enclose the corresponding directions, so that the protection safety of the foldable ladder top platform 3 is improved. In the embodiment of the present utility model, the two side uprights of the guard rail 33 are hinged to the suspended ends of the ladder top connection frame 31 in a direction of rotation toward the climbing side of its corresponding upper straight ladder 2, i.e., in a direction of the tread of the upper straight ladder 2. After being turned upwards and unfolded to be in a vertical state, the two end guardrails 33 have a limit, namely a folding structure which is relatively far away. After the two end guardrails 33 are rotated upwards to be opened into a vertical state, the two end guardrails 33 can be tensioned and fixed through the tensioning device 4, so that an integral frame guardrail is formed. As shown in fig. 1 and 6, in order to further increase the stability of the guard rail 33, a pulling link 37 is provided between the left and right side columns of the guard rail 33 and the inner sides of the corresponding ladder top connection frame 31, and after the guard rail 33 is rotated upward to be opened to be in a vertical state, the guard rail 33 is pulled and fixed by the pulling link 37, so that the guard rail 33 is kept in a stable vertical state. In order to enhance the support stability between the two lower vertical ladders 1, as shown in fig. 1, the upper ends of the two lower vertical ladders 1 are further connected with two tensioning devices 4, and the tensioning devices 4 at the two lower vertical ladders 1 can fix the unfolding angles of the two lower vertical ladders 1, prevent the change of the unfolding angles and increase the stability of the support structure of the lower vertical ladders 1.

Specifically, in the embodiment of the present utility model, as shown in fig. 9, the tightening device 4 includes a telescopic rod 41, two stay hooks 42 and two rings 44, the length of which is adjustable, wherein one tightening device 4 includes one telescopic rod 41, two stay hooks 42 and two rings 44. Specifically, two ends of the telescopic rod 41 are respectively fixed with a supporting hook 42, and the same side of the two guardrails 33 are respectively fixed with a circular ring 44 on the opposite upright posts. The stay hooks 42 are fixedly connected to the circular rings 44, and after the stay hooks 42 at both ends are respectively hooked to the circular rings 44 at the corresponding sides, the length of the telescopic rod 41 is adjusted to have the function of tensioning or supporting. In order to prevent the stay hook 42 from being separated from the circular ring 44, the stay hook 42 is provided with a slingshot lock 43 for closing the hook opening at the hook opening, the slingshot lock 43 is connected with the stay hook 42 at the hook opening through a spring reset shaft, and the hook opening of the stay hook 42 can be closed or unlocked through the slingshot lock 43. In the embodiment of the present utility model, the rings 44 are fixed on opposite sides of the same side upright of the two side guardrails 33, and it is understood that the rings 44 fixed on the same side upright of the two side guardrails 33 are located on the same height plane. At the tightening device 4 between the two lower vertical ladders 1, the ring 44 on the tightening device 4 at this location is fixed on the ladder support of the lower vertical ladder 1, wherein the tightening fixation of the tightening device 4 at this location between the lower vertical ladders 1 on the lower vertical ladder 1 is the same as the working principle of the tightening device 4 at the above-mentioned guardrail 33, and will not be described again here.

Further, in the embodiment of the present utility model, as shown in fig. 2, the ladder top connection frame 31 includes horizontal suspensions 311 fixed to the top ends of both side ladder legs of the upper straight ladder 2, wherein both side horizontal suspensions 311 are provided with a ladder top plate 312 at an inner end remote from the suspended ends thereof, and the plane work table 32 is laid on top of the ladder top plate 312 and the both side horizontal suspensions 311. In a preferred embodiment, the horizontal suspension 311 is an angle steel member having an "L" structure, and screw holes are formed in the surface thereof, and both ends of the ladder top plate 312 are fixed to the inner end side of the horizontal suspension 311 through the screw holes. Specifically, as shown in fig. 6, in the lateral direction of the ladder, a drag link 37 is connected at one end to the inner end of the horizontal suspension 311 and at the other end to the same side column of the guardrail 33. Specifically, as shown in fig. 2, the upper surface of the ladder top plate 312 is not higher than the upper surface of the angle member, and the flat table 32 is laid on the ladder top plate 312 and the both-side horizontal suspensions 311 after being unfolded, and is fixed by fixing members. As an exemplary illustration, the structural member may be a screw, a fixed pin, or the like. To improve the support stability of the collapsible ladder top platform, the suspended ends of the ladder top connection frame 31 are provided with support links 35 at the left and right corners, which are connected to the ladder struts of the straight ladder 2 on the respective sides, as shown in fig. 1.

Further, in the embodiment of the present utility model, as shown in fig. 3, the flat table 32 includes a plurality of straight plates 321 having the same size and being sequentially hinged, wherein in order to fold the flat table 32 to the maximum, as shown in fig. 3, the hinges 322 between adjacent straight plates 321 are sequentially staggered for the first time on the upper side and the lower side of the plate surface, and each straight plate 321 can be sequentially folded in one height direction by sequentially staggering the hinges 322 for the first time on the upper side and the lower side of the plate surface. Specifically, in the preferred embodiment of the present utility model, as shown in fig. 3, the hinges of the hinge 322 are installed and fixed in a sunk manner, that is, the upper side surface and the lower side surface of the straight plate 321 are provided with sunk hinge fixing grooves, and by fixing the hinges of the hinge 322 in the hinge fixing grooves, the whole plane table 32 can have a flat horizontal plane, which is convenient for folding the plane table 32 and can avoid the potential safety hazard of the plane table 32 due to uneven surface.

In some embodiments, as shown in fig. 4, the hinge structure 36 on opposite sides of the two ladder top connection frames 31 includes a shaft 361a integrally formed on the inner end side of the left ladder top plate and a shaft sleeve 362a integrally formed on the inner end side of the right ladder top plate, wherein the shaft 361a and the shaft sleeve 362a are respectively disposed diagonally downward and opposite to each other, a straight-bar type rotation notch is formed on the shaft sleeve 362a along the length direction thereof, and two ends of the shaft sleeve 362a are opened. When the shaft 361a is connected, the shaft 361a is inserted from the end opening, and the shaft 361a can be rotatably connected in the shaft sleeve 362a at a corresponding angle by taking the rotation notch as the movable range. Wherein, the lower surfaces of the ladder top plates 312 at the left and right sides are respectively formed with a fixing plate arranged obliquely outwards, and the top ends of the ladder support posts of the upper straight ladder 2 are fixedly connected with the corresponding ladder top plates 312 through the fixing plates.

In some embodiments, as shown in fig. 5, the hinge structure 36 on opposite sides of the two roof connection frames 31 includes an outer hub 361b integrally formed at the inner end side of the left roof and an inner hub 362b integrally formed at the inner end side of the right roof, wherein the outer hub 361b and the inner hub 362b are disposed diagonally downward and opposite each other, and the outer hub 361b is provided with a straight rotation notch along its length direction, and both ends of the outer hub 361b are opened. When inner hub 362b is inserted into outer hub 361b from the end opening during connection, inner hub 362b is rotatably connected within outer hub 361b at a corresponding angle with the rotational slot as the range of motion. Wherein, the lower surfaces of the ladder top plates 312 at the left and right sides are respectively formed with a fixing plate arranged obliquely outwards, and the top ends of the ladder support posts of the upper straight ladder 2 are fixedly connected with the corresponding ladder top plates 312 through the fixing plates.

Further, in the embodiment of the present utility model, as shown in fig. 1, the number of the locking devices 5 is two, and the locking devices are relatively fixed to the outer side surfaces of the upper ends of the two side ladder legs of the lower vertical ladder 1, so as to lock a specific lower vertical ladder step piece 11 of the lower vertical ladder 1 and any one upper vertical ladder step piece 21 of the upper vertical ladder 2 on the same side after the height is adjusted in place. Specifically, as shown in fig. 7 and 15, the locking device 5 includes a spring hook 51 elastically connected to a specific lower vertical ladder pedal 11, and pedal fixing bases 111 are respectively fixed to the outer side surfaces of the upper ends of both ladder legs of the lower vertical ladder 1, and both ends of the specific lower vertical ladder pedal 11 are provided in the pedal fixing bases 111. As shown in fig. 7, the spring hook 51 is integrally formed with a curved section, a supporting section 52 and a hook locking end 53, wherein the supporting section 52 is inserted into a hollow groove in the end of a specific lower straight ladder footrest 11 and connected with a spring 54 in the groove. The two ends of each upper straight ladder pedal piece 21 penetrate and are fixed on the ladder support columns on the two sides of the upper straight ladder 2, chrysanthemum through holes 211 are formed in the outer side surfaces of the ladder support columns, and the hook locking ends 53 penetrate through the chrysanthemum through holes 211 and are in locking connection with the upper straight ladder pedal pieces 21 at corresponding positions. In the embodiment of the present utility model, the specific lower straight ladder rung 11 is a certain lower straight ladder rung at the upper end of the lower straight ladder 1.

It will be appreciated that in the embodiment of the utility model, the locking between the upper vertical ladder 2 and the lower vertical ladder 1 on one side is performed by two opposite locking devices 5, and the locking between the upper vertical ladder 2 and the lower vertical ladder 1 on the other side is also performed by two opposite automatic locking devices 5, i.e. in the embodiment of the utility model, the total number of locking devices 5 is four.

In a preferred embodiment of the present utility model, as shown in fig. 13 and 14, the lower straight ladder 1 includes an upper ladder section 17 and a lower ladder section 19, wherein the width of the upper ladder section 17 is smaller than that of the lower ladder section 19, and a convex engagement section 18 is formed between the upper ladder section 17 and the lower ladder section 19. In the embodiment of the utility model, the upper straight ladder 2 and the lower straight ladder 1 are connected in a sliding manner in a plugging manner. In particular, the upper straight ladder 2 is in plug-in connection with the upper ladder section 17, so that in an embodiment of the utility model the width of the upper straight ladder 2 is smaller than the width of the upper ladder section 17 and both are adapted to be plug-in. As shown in fig. 7, the inner side surface of the ladder pillar of the lower vertical ladder 1 is formed with a plugging slot, the upper vertical ladder 2 is plugged in the plugging slot, and the end surface of one side of the upper vertical ladder 2 in the plugging slot is formed with a concave inner surface, and the side wall of the plugging slot is provided with an opening for the passage of the hook locking end 53. As a preferred embodiment of the present utility model, the insertion groove is an open "U" shaped groove. As shown in fig. 14, the back side of the upper end of the lower vertical ladder 1 is further provided with at least one back tread member opposite to the front tread member at a position above or below the specific lower vertical ladder tread member 11, and the front tread member and the back tread member at the position can restrain the upper vertical ladder 2 inserted to the upper end of the lower vertical ladder 1 to further enhance the connection stability between the upper vertical ladder 2 and the lower vertical ladder 1.

When the upper vertical ladder 2 needs to be lifted, the locking device 5 is kept in a releasing state, namely the hook locking end 53 of the spring hook code 51 is biased to the outer side and is not hooked into the chrysanthemum through hole 211 of the upper vertical ladder 2. Then, the upper vertical ladder lifting device 9 is operated to move the upper vertical ladder 2 upwards along the ladder surface of the lower vertical ladder 1, after the upper vertical ladder 2 is moved up to a required height, an upper vertical ladder foot piece 21 corresponding to a specific lower vertical ladder foot piece 11 on the upper vertical ladder 2 is aligned with the specific lower vertical ladder foot piece 11, the chrysanthemum through hole 211 of the upper vertical ladder foot piece 21 is aligned with the hook locking end 53, then the spring hook code 51 is pulled, the hook locking end 53 biased to the outer side enters the inserting groove through the opening on the side wall of the inserting groove at the position, and is further inserted into the chrysanthemum through hole 211 of the current upper vertical ladder foot piece 21, so that the locking of the upper vertical ladder 2 and the lower vertical ladder 1 is completed, at the moment, the upper vertical ladder 2 and the lower vertical ladder 1 are relatively fixed, and the foldable ladder top platform 3 at the top end of the upper vertical ladder 2 can obtain a working position with a preset height.

Further, in the embodiment of the present utility model, as shown in fig. 6, a detachable revolving door 34 is further provided in the circumferential direction formed by enclosing the two guardrails 33, and the construction worker can enter the foldable ladder top platform 3 through the revolving door 34 on the two guardrails 33 on the climbing side. Specifically, as shown in fig. 8, the swing door 34 includes a swing door frame 341, a toe guard 342 provided at a lower position of the swing door frame 341, and a window opening 343 at an upper position. Wherein, a vertical side of the revolving door frame 341 is provided with a revolving door axle 344, the revolving door axle 344 is detachably connected to a corresponding side column of the guardrail 33 in a revolving way, and another vertical side of the revolving door frame 341 is fixedly connected to the corresponding side column of the guardrail 33 through a door bolt 345.

Specifically, in the preferred embodiment of the present utility model, as shown in fig. 8, a lower door-shaft bracket 346 and an upper door-shaft bracket 347 are provided on the upright of the guardrail 33 on the side corresponding to the rotating door-shaft 344, and the lower door-shaft bracket 346 and the upper door-shaft bracket 347 are each an "L" -shaped metal member fixed to the upright of the guardrail 33 by screws, respectively. The upper end of the rotating door shaft 344 is arranged in the shaft hole of the upper door shaft bracket 347 in a penetrating way, the lower end of the rotating door shaft 344 is arranged in the shaft hole of the lower door shaft bracket 346 in a penetrating way, and the upper end and the lower end of the rotating door shaft 344 are not limited at the shaft hole. In order to facilitate the disassembly of the revolving door 34, as shown in fig. 7, the upper door-shaft bracket 347 is further away from the upper frame edge of the revolving door frame 341, and the revolving door shaft 344 is formed with a relief section 3441. When the swing door 34 needs to be detached, the whole swing door 34 is lifted up by a certain distance, the lower end of the swing door shaft 344 is separated from the shaft hole of the lower door shaft bracket 346 under the yielding provided by the yielding section 3441, and then the upper end of the swing door shaft 344 is separated from the shaft hole of the upper door shaft bracket 347, so that the whole swing door 34 can be detached.

Further, in the embodiment of the present utility model, as shown in fig. 1, the outer sides of the ladder struts of the two lower vertical ladders 1 are respectively detachably hinged with a telescopic inclined strut 6 with adjustable height, and the lower end of the telescopic inclined strut 6 is provided with an auxiliary sliding device 7 for assisting the lower vertical ladder 1 in adjusting the unfolding angle. The auxiliary sliding device 7 has two working states, in the first state, the auxiliary sliding device 7 is separated from the ground, the telescopic inclined strut 6 is supported on the ground at the moment, in the second state, the auxiliary sliding device 7 falls to the ground, the lower end of the telescopic inclined strut 6 is separated from the ground, and the conversion between the first state and the second state is adjustable according to working requirements. In an embodiment of the utility model, the telescopic diagonal strut 6 may provide additional support for the deployed lower vertical ladder 1 to enhance the support stability of the ladder. The auxiliary sliding device 7 provides assistance for the lower vertical ladder 1 when the unfolding angle is adjusted, when the unfolding angle of the lower vertical ladder 1 is required to be adjusted, the auxiliary sliding device 7 is adjusted to a second state, the auxiliary sliding device 7 falls to the ground, the lower end of the telescopic inclined strut 6 is lifted off the ground, and at the moment, the lower vertical ladder 1 can be easily adjusted in the unfolding angle by means of the falling auxiliary sliding device 7. After the expansion angle is adjusted, the auxiliary sliding device 7 is adjusted to a first state, so that the auxiliary sliding device 7 is separated from the ground, the lower end of the telescopic inclined strut 6 falls to the ground, and at the moment, the telescopic inclined strut 6 is supported on the ground to provide auxiliary support for the lower straight ladder 1. In order to prevent the foot end of the lower vertical ladder 1 from sliding with the ground, as shown in fig. 11, the foot end of the lower vertical ladder 1 is provided with an anti-slip rubber cap 13.

Specifically, as shown in fig. 10, the upper end of the telescopic oblique strut 6 is provided with a hook 61, the hook 61 is provided with a lock tongue 62 which can be toggled at the position of the hook, and the lock tongue 62 is fixed at the root of the hook 61 through a spring reset shaft and is used for sealing the hook. The outer side surface of the ladder pillar of the lower straight ladder 1 is provided with a rotating seat 65, the rotating seat 65 is provided with a hook ring 66, and the locking hook 61 is locked through the lock tongue 62 after being hooked into the hook ring 66. In order to prevent the latch bolt 62 from rotating reversely, as shown in fig. 9, a stopper 63 is further provided at the root of the hook 61 on the rotation limiting side of the latch bolt 62, after the latch bolt 62 closes the hook opening of the hook 61, the outer side of the latch bolt 62 abuts against the stopper 63, and the latch bolt 62 is prevented from being forced to rotate reversely by the stopper 63, and a certain supporting strength is provided for the latch bolt. In some embodiments, as shown in fig. 10, a first reinforcing plate 64 is fixed to the outer side of the ladder post of the lower vertical ladder 1, wherein a rotating seat 65 is fixed to the first reinforcing plate 64.

Specifically, as shown in fig. 11, the auxiliary sliding device 7 includes a plurality of telescopic rods 71 horizontally arranged and auxiliary sliding rollers 72 provided at left and right ends of the telescopic rods 71, and a middle fixing section of the telescopic rods 71 is adjustably fixed at a foot end of the lower vertical ladder 1 through fixing lugs 73. Specifically, a plurality of positioning holes are formed at the foot end of the lower straight ladder 1 along the length direction, the fixed ear seat 73 is provided with a hole position corresponding to the positioning holes, and when the auxiliary sliding device 7 needs to be adjusted to a ground-leaving state, the fixed ear seat 73 and the multi-section telescopic rod 71 are integrally moved upwards by a plurality of hole positions and then fixed. When the auxiliary sliding device 7 is required to be adjusted to a ground state, the fixed lug 73 and the multi-section telescopic rod 71 are integrally moved downwards by a plurality of hole sites, and then fixed. It can be understood that the fixing ear seat 73 and the lower straight ladder 1 can be fixed by a screw, a pin or an elastic positioning pin. To enhance the stability of the connection structure, the foot end of the telescopic oblique strut 6 is provided with a plurality of positioning holes, the telescopic sections at the two ends of the multi-section telescopic rod 71 are provided with hole positions corresponding to the positioning holes, and the two ends of the multi-section telescopic rod 71 are fixed with the corresponding positioning holes on the telescopic oblique strut 6 through the hole positions. It can be understood that the fixing of the telescopic rod 71 and the telescopic inclined strut 6 can be screw fixing, pin fixing, elastic locating pin fixing.

Further, in the embodiment of the present utility model, as shown in fig. 1, the lower ends of the two lower vertical ladders 1 are provided with auxiliary towing means 8, by which the folded ladder (the upper vertical ladder 2 and the lower vertical ladder 1 are overlapped) or the whole assembled ladder can be towed or translated. In the embodiment of the present utility model, the auxiliary towing device 8 has two working states, namely a landing state and a ground-off state. When the ladder works normally, the auxiliary towing device 8 is kept in a ground-leaving state, and when the folded ladder or the whole assembled ladder needs towing or translation, the auxiliary towing device 8 is kept in a ground-falling state. It will be appreciated that when the embodiment of the present utility model is provided with both the auxiliary sliding device 7 and the auxiliary towing device 8, the auxiliary sliding device 7 needs to be kept in the off-ground state first and then the auxiliary towing device 8 is kept in the on-ground state when the entire assembled ladder is translated, and at this time, the assembled entire ladder can be translated. After the ladder is folded, the auxiliary towing device 8 is kept in a landing state, and the folded ladder can be towed.

Specifically, in the embodiment of the present utility model, as shown in fig. 11, the auxiliary towing device 8 includes a diagonal telescopic rod 81 hinged to a ladder pillar of the lower vertical ladder 2 and a towing roller 82 provided at a lower end of the diagonal telescopic rod 81. Wherein, in order to enhance the connection stability, the ladder pillar of the lower vertical ladder 2 is provided with a second reinforcing plate 12 at the foot end position, and the cable-stayed telescopic rod 81 is rotatably connected to the second reinforcing plate 12 through a hinge shaft. The second reinforcing plate 12 is provided with a plurality of angle positioning holes 121 arranged along an arc path, the inclined telescopic rod 81 is provided with jacks, when the inclined telescopic rod 81 is required to be adjusted, the jacks are aligned with the angle positioning holes 121 at corresponding positions, and the inclined telescopic rod is fixed through positioning pins or screws, so that the ground separation and landing states of the second reinforcing plate are adjusted.

The auxiliary sliding device 7 and the auxiliary dragging device 8 can assist the ladder to realize flexible state adjustment in the working process, and the auxiliary sliding device is convenient to use and stable and reliable in gravity center.

As an exemplary illustration of the present utility model, the footrests on the lower vertical ladder 1 and the upper vertical ladder 2 are all lightweight aluminum alloy pieces, and the outer surfaces of the footrests are formed with anti-skid patterns. The ladder top plate 312 and the straight plate 321 may be made of wood or lightweight metal.

In some embodiments, as shown in fig. 13, a plurality of telescopic inclined struts 6 on the left and right sides of the lower vertical ladder 1 may be further provided, and when the elevation height of the upper vertical ladder 2 is high, the supporting stability of the whole guardrail ladder may be further enhanced by the plurality of telescopic inclined struts 6 which are supported in an inclined manner.

While the basic principles, main features and advantages of the present utility model have been shown and described, it will be understood by those skilled in the art that the present utility model is not limited by the foregoing embodiments, which are described in the foregoing description as merely illustrative of the principles of the present utility model, various changes and modifications may be made therein without departing from the spirit and scope of the utility model as defined in the appended claims and their equivalents.

Claims (10)

1. Scalable and folding guardrail ladder, its characterized in that includes:

two lower straight ladders (1), the lower ends of which are supported on the ground;

the two upper straight ladders (2), the upper straight ladders (2) are connected with the lower straight ladders (1) on the corresponding sides in a sliding manner in the length direction, and the upper straight ladders (2) on the corresponding sides with the heights adjusted in place are fixed through locking devices (5) arranged at the upper end parts of the lower straight ladders (1);

the foldable ladder top platform (3) is arranged at the top ends of the two upper straight ladders (2) and articulates the top ends of the two upper straight ladders (2).

2. The telescopic and folding guardrail ladder according to claim 1, characterized in that the foldable ladder top platform (3) comprises ladder top connecting frames (31) fixed at the top ends of the two upper straight ladders (2) respectively and hinged at opposite sides, the ladder top connecting frames (31) are provided with foldable plane work tables (32), and the suspended ends of the ladder top connecting frames (31) are provided with support connecting rods (35) connected with ladder struts of the upper straight ladders (2) at the left and right corners.

3. The telescopic and folding guardrail ladder according to claim 2, characterized in that the ladder top connecting frame (31) is provided with a guardrail (33) with an n-shaped structure on one side of the hanging end, the two side upright posts of the guardrail (33) are hinged with the hanging end of the ladder top connecting frame (31), a detachable tensioning device (4) for tensioning the two guardrails (33) is arranged between the same side opposite upright posts of the two guardrails (33) in the climbing direction of the two side ladders, and a traction connecting rod (37) is arranged between the left and right side upright posts of the guardrail (33) and the inner end two sides of the corresponding ladder top connecting frame (31).

4. A telescopic and folding guardrail ladder according to claim 3, characterized in that the tensioning device (4) comprises a telescopic rod (41) with adjustable length, a supporting hook (42) and a circular ring (44), wherein one supporting hook (42) is respectively fixed at two ends of the telescopic rod (41), one circular ring (44) is respectively fixed on the opposite upright posts on the same side of the two guardrails (33), the supporting hooks (42) are fixedly connected in the circular rings (44), and a slingshot lock (43) for closing the hook mouth is arranged at the hook mouth of the supporting hook (42).

5. The telescopic and folding guardrail ladder according to claim 2, characterized in that the ladder top connection frame (31) comprises horizontal suspensions (311) fixed to the top ends of the ladder struts on both sides of the upper straight ladder (2), the horizontal suspensions (311) on both sides being provided with ladder top plates (312) at the inner ends remote from the suspended ends thereof, the plane work table (32) being laid on the ladder top plates (312) and on both sides of the horizontal suspensions (311).

6. The retractable and folding guardrail ladder of claim 2, wherein the planar work table (32) comprises a plurality of straight plates (321) which are identical in size and are hinged in sequence, and the hinges (322) between adjacent straight plates (321) are staggered for the first time on the upper side and the lower side of the plate surface in sequence.

7. The telescopic and folding guardrail ladder according to claim 1, characterized in that the number of locking devices (5) is two, and the locking devices are relatively fixed on the outer side surfaces of the upper ends of the two side ladder supports of the lower straight ladder (1) for locking a specific lower straight ladder pedal (11) of the lower straight ladder (1) and any upper straight ladder pedal (21) of the upper straight ladder (2) after the height is adjusted in place.

8. The telescopic and folding guardrail ladder according to claim 7, characterized in that the locking device (5) comprises a spring hook code (51) elastically connected to the specific lower vertical ladder pedal (11), the outer side surfaces of the upper ends of the ladder struts on the two sides of the lower vertical ladder (1) are respectively fixed with a pedal fixing seat (111), the two ends of the specific lower vertical ladder pedal (11) are arranged in the pedal fixing seat (111), the supporting section (52) of the spring hook code (51) is connected in a hollow groove at the end part of the specific lower vertical ladder pedal (11) in a penetrating way and is connected with a spring (54) in the groove, the two ends of each upper vertical ladder pedal (21) are fixed on the ladder struts on the two sides of the upper vertical ladder (2) in a penetrating way, chrysanthemum through holes (211) are formed on the outer side surfaces of the ladder struts, and the hook locking ends (53) of the spring hook code (51) penetrate through the chrysanthemum through holes (211) and are connected with the corresponding upper vertical ladder pedal (21) in a locking way.

9. A telescopic and folding guardrail ladder according to claim 3, characterized in that the two guardrails (33) are enclosed to form a circumference direction and are further provided with a detachable revolving door (34), the revolving door (34) comprises a revolving door frame (341), a foot protection plate (342) arranged at the lower part of the revolving door frame (341) and a window opening (343) arranged at the upper part of the revolving door frame, a revolving door shaft (344) is arranged at one vertical side of the revolving door frame (341), the revolving door shaft (344) is detachably connected to the corresponding side upright post of the guardrail (33) in a revolving way, and the other vertical side of the revolving door frame (341) is fixedly connected with the corresponding side upright post of the guardrail (33) through a door bolt (345).

10. The telescopic and folding guardrail ladder according to claim 1, characterized in that the outer sides of the ladder struts of the two lower straight ladders (1) are respectively and detachably hinged with at least one telescopic inclined strut (6) with adjustable height, the lower ends of the telescopic inclined struts (6) are provided with auxiliary sliding devices (7) for assisting the lower straight ladders (1) in adjusting the unfolding angle, and the lower ends of the two lower straight ladders (1) are provided with auxiliary dragging devices (8).