Hinge assembly, folding ladder and combined guide rail crawling ladder

Abstract

The utility model relates to the technical field of guide rail crawling ladders, and provides a hinge assembly, a folding ladder and a combined guide rail crawling ladder, the hinge assembly comprises a first hinge piece, a second hinge piece and a hinge part, one of the first hinge piece and the second hinge piece is provided with a first positioning hole and a first positioning groove, and the other one is provided with a second positioning hole; the hinging part comprises a hinging shaft, a shaft sleeve, an elastic part, a limiting part and a positioning part, and the shaft sleeve is arranged on the outer side of the hinging shaft in a sleeving mode and fixedly matched with the hinging part provided with a first positioning hole and a first positioning groove; the elastic piece is located between the hinge shaft and the shaft sleeve. The limiting part and the matching part are matched for limiting; the positioning part is fixedly arranged on the hinge shaft and suitable for moving along with the hinge shaft so that the positioning part can be inserted into the first positioning hole and the second positioning hole in the unfolded state and can be inserted into the first positioning groove and the second positioning hole in the folded state. The guide rail ladder stand is novel in structural design, and is convenient to assemble on site when being applied to the guide rail ladder stand.

Description

Technical Field

[0001] The utility model relates to the technical field of guide rail ladders, in particular to a hinge assembly, a folding ladder and a combined guide rail ladder. Background Art

[0002] With the diversified development of high-altitude operations, especially in the material transportation aspects such as wind power, construction and photovoltaic, the guide rail ladder mainly provides support and guiding functions for the lifting carrier. The length of the guide rail ladder increases with the increase of the transportation height. Especially when the lifting carrier is lifted to a height of 10 meters, the value of the guide rail ladder will exceed half of the total value of the lifting equipment.

[0003] In order to facilitate the transportation and installation of the guide rail ladder, in the related art, folding guide rails or telescopic guide rails are often used as the support and guiding main body of the lifting carrier. Since the main function of the guide rail ladder is the guiding and supporting function of the guide rail, the assembly accuracy requirements for the guide rail ladder are relatively high. However, the currently used folding guide rails or telescopic guide rails are all assembled or spliced with multiple standard sections to meet the corresponding length requirements. Not only the assembly accuracy cannot be effectively satisfied, but also the assembly efficiency is low, and there are too many on-site splicing fittings, which are easy to lose. Summary of the Utility Model

[0004] The first aspect of the utility model provides a hinge assembly, which is used to solve the above technical defects in the prior art. The structure design is novel. When applied to a guide rail ladder, it can complete opening and locking, or folding and locking synchronously in one operation, without additional locking parts for locking, the operation is simple, and it can reduce the problems of jamming and failure in the intermediate process, and is convenient for on-site assembly.

[0005] The second aspect of the utility model provides a folding ladder.

[0006] The third aspect of the utility model provides a combined guide rail ladder.

[0007] The first aspect of the utility model provides a hinge assembly, including a first hinge member, a second hinge member and a hinge component.

[0008] Both the first hinge member and the second hinge member are provided with a connection end and a hinge end. The connection end is adapted to connect to the ladder unit. A first positioning hole and a first positioning groove are provided on the hinge end of one of the first hinge member and the second hinge member, and a second positioning hole is provided on the hinge end of the other of the first hinge member and the second hinge member.

[0009] The hinge component is used to hinge the first hinge member and the second hinge member. The hinge component includes a hinge shaft, a bushing, an elastic member, a limiting member, and a positioning member. The bushing is sleeved outside the hinge shaft and is fixedly fitted with the hinge member provided with the first positioning hole and the first positioning groove. The bushing is provided with a fitting portion. The elastic member is sleeved outside the hinge shaft and is located between the hinge shaft and the bushing. The limiting member is movably arranged on the hinge shaft and is adapted to cooperate with the fitting portion for limiting. The positioning member is fixedly arranged on the hinge shaft and is adapted to move with the hinge shaft. In the unfolded state, it is inserted into the first positioning hole and the second positioning hole. In the folded state, it is inserted into the first positioning groove and the second positioning hole.

[0010] According to the hinge assembly provided by the present invention, the positioning member includes a positioning piece and a positioning pin.

[0011] The positioning piece is fixedly connected to the hinge shaft and is adapted to move with the hinge shaft. The positioning pin is fixedly connected to the positioning piece and is adapted to move with the hinge shaft under the drive of the positioning piece. In the unfolded state, it is inserted into the first positioning hole and the second positioning hole. In the folded state, it is inserted into the first positioning groove and the second positioning hole.

[0012] According to the hinge assembly provided by the present invention, there are two sets of the first positioning holes and the first positioning grooves on the corresponding hinge member. The first positioning holes in one set and the first positioning grooves in the other set are located on a first virtual circle. The first positioning grooves in one set and the first positioning holes in the other set are located on a second virtual circle. The first virtual circle and the second virtual circle are concentric circles with the axis of the hinge shaft as the center.

[0013] Correspondingly, there are two sets of the second positioning holes on the hinge member. The projections of one set of the second positioning holes are located on the first virtual circle, and the projections of the other set of the second positioning holes are located on the second virtual circle. There are two sets of the positioning pins, and the positions of the two sets of the positioning pins correspond to the positions of the two sets of the second positioning holes one by one.

[0014] According to the hinge assembly provided by the present invention, one of the first hinge member and the second hinge member is provided with a first hinge split body and a second hinge split body. The first hinge split body and the second hinge split body are parallel and spaced apart. A receiving cavity is defined between the first hinge split body and the second hinge split body. The second positioning hole penetrates through the first hinge split body and the second hinge split body.

[0015] The hinged end of the other one of the first hinge member and the second hinge member is clamped in the accommodating cavity, and the first positioning hole and the first positioning groove are formed in the hinged end of the other one of the first hinge member and the second hinge member.

[0016] According to the hinge assembly provided by the present utility model, the limiting member includes an elastic body and a ball, and the balls are arranged at both ends of the elastic body; a limiting hole is formed in the hinge shaft along the diameter direction of the hinge shaft, the elastic body is arranged in the limiting hole, and the balls are adapted to protrude from or be received in the limiting hole.

[0017] According to the hinge assembly provided by the present utility model, the hinge member further includes a force applying member, the cross-sectional area of the force applying member is larger than the cross-sectional area of the hinge shaft, and the force applying member is fixedly arranged at one end of the hinge shaft.

[0018] According to the hinge assembly provided by the present utility model, a protrusion is arranged on the outer side wall of the bushing, and a clamping groove for clamping and cooperating with the protrusion is arranged on the hinge member fixedly matched with the bushing.

[0019] The present utility model further provides a folding ladder, which includes two ladder units and the hinge assembly according to any one of the above items. The hinge assembly is located between the two ladder units and is used for hinging the two ladder units.

[0020] The present utility model further provides a combined guide rail ladder, which includes a base, a telescopic ladder and at least one folding ladder. Adjacent two folding ladders are connected by a connecting member. The folding ladder is movably connected to one end of the telescopic ladder, and the base is connected to the other end of the telescopic ladder.

[0021] According to the combined guide rail ladder provided by the embodiment of the present utility model, the telescopic ladder includes a telescopic ladder unit and a locking mechanism.

[0022] One end of the telescopic ladder unit is connected to the folding ladder, and the other end of the telescopic ladder unit is connected to the base; the locking mechanism is arranged on the telescopic ladder unit and is adapted to lock the folding ladder so that the positions of the folding ladder and the telescopic ladder unit are relatively fixed.

[0023] The hinge assembly provided by the present utility model is provided with a first positioning hole and a first positioning groove on the hinge end of one of the first hinge member and the second hinge member, and a second positioning hole is provided on the hinge end of the other of the first hinge member and the second hinge member. The first hinge member and the second hinge member are hinged by a hinge component, so that the hinge component includes a hinge shaft, a shaft sleeve, an elastic member, a limiting member and a positioning member. The shaft sleeve is sleeved outside the hinge shaft, and a matching portion is provided on the shaft sleeve. The hinge member provided with the first positioning hole and the first positioning groove is fixedly matched with the shaft sleeve; the elastic member is sleeved outside the hinge shaft and is located between the hinge shaft and the shaft sleeve; the limiting member is movably arranged on the hinge shaft and is adapted to cooperate with the matching portion for limiting; the positioning member is fixedly arranged on the hinge shaft and is adapted to move along with the hinge shaft, so as to be inserted into the first positioning hole and the second positioning hole in the unfolded state, and to be inserted into the first positioning groove and the second positioning hole in the folded state.

[0024] With such a setting, during the unfolding process, until the first positioning hole and the second positioning hole are aligned, and the positioning member is inserted into the first positioning hole and the second positioning hole, and cooperates with the first positioning hole and the second positioning hole to realize the limiting eccentrically arranged relative to the axis of the hinge shaft. During the process of completing the unfolding, locking is synchronously realized, that is, one operation can synchronously complete unfolding and locking without additional locking parts for locking, the operation is simple, and the operation process can be simplified. Similarly, during the folding process, until the first positioning groove and the second positioning hole are aligned, and the positioning member is inserted into the first positioning groove and the second positioning hole, and realizes the limiting eccentrically arranged relative to the axis of the hinge shaft with the first positioning groove and the second positioning hole. During the process of completing the folding, locking is synchronously realized, that is, one operation can synchronously complete folding and locking without additional locking parts for locking, the operation is simple, and the operation process can be simplified, and the problems of jamming and failure in the intermediate process can be reduced.

[0025] In addition, when the folding ladder formed by connecting the hinge assemblies is applied to the combined guide rail climbing ladder, only adjacent two folding ladders need to be connected together through connecting parts. Since the folding ladder only needs one operation to complete unfolding and locking, the operation is simple, and the assembly process can be simplified. There is no need to assemble or piece together multiple standard sections, the assembly efficiency is high, the number of parts on site is reduced, and the loss of parts can be effectively avoided. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0027] Figure 1It is the front view of the combined guide rail ladder provided by the embodiment of the present invention.

[0028] Figure 2 It is the assembly schematic diagram of the folding ladder provided by the embodiment of the present invention.

[0029] Figure 3 It is Figure 2 The enlarged view of part A in

[0030] Figure 4 It is the structural schematic diagram of the hinge assembly provided by the embodiment of the present invention.

[0031] Figure 5 It is the front view of the hinge assembly provided by the embodiment of the present invention.

[0032] Figure 6 It is Figure 5 The cross-sectional view along line A-A in

[0033] Figure 7 It is the cross-sectional view of the hinged part in the hinge assembly provided by the embodiment of the present invention.

[0034] Figure 8 It is the side view of the hinge assembly provided by the embodiment of the present invention.

[0035] Figure 9 It is Figure 8 The cross-sectional view along line B-B (in the folded state) in

[0036] Figure 10 It is the cross-sectional view of the hinge assembly (in the unfolded state) provided by the embodiment of the present invention.

[0037] Figure 11 It is the partial structural explosion diagram of the hinged part provided by the embodiment of the present invention.

[0038] Figure 12 It is one of the partial structural schematic diagrams of the combined guide rail ladder provided by the embodiment of the present invention.

[0039] Figure 13 It is Figure 12 The cross-sectional view along line D-D in

[0040] Figure 14 It is the side view of the combined guide rail ladder provided by the embodiment of the present invention.

[0041] Figure 15 It is Figure 14 One of the partial structural schematic diagrams of the combined guide rail ladder shown.

[0042] Reference numerals:

[0043] 10. Base;

[0044] 20. Telescopic ladder; 22. Telescopic ladder unit; 23. Locking mechanism; 231. Quick lock structure; 232. Locking block; 25. Guide member;

[0045] 30. Folding ladder; 31. Climbing ladder unit; 311. Guide groove; 32. Hinge assembly; 321. First hinge member; 3211. First positioning hole; 3212. First positioning groove; 3213. Card slot; 322. Second hinge member; 3221. Second positioning hole; 3222. First hinge split body; 3223. Second hinge split body; 3224. Accommodating cavity; 323. Hinge component; 3231. Hinge shaft; 3231-1. Limit hole; 3,232. Bushing; 32,32-1. Limit groove; 32,32-2. Projection; 3233. Elastic member; 3234. Limit member; 3234-1. Elastic body; 3234-2. Ball; 3235. Positioning member; 3235-1. Positioning piece; 3235-2. Positioning pin; 3236. Force applying member; 324. Reinforcing member;

[0046] 40. Connecting component. Detailed implementation manners

[0047] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0048] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0049] In the embodiments of the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0050] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0051] Figure 1 is the front view of the combined guide rail ladder provided by the embodiment of the present utility model. Figure 2 is the assembly schematic diagram of the folding ladder provided by the embodiment of the present utility model. Figure 3 is Figure 2 the enlarged view of part A in

[0052] Refer to Figures 1 to 3 As shown in, the embodiment of the present utility model provides a combined guide rail ladder, which is composed of three parts, namely a base 10, a telescopic ladder 20, and at least one folding ladder 30. Adjacent two folding ladders 30 are connected by a connecting member 40. The folding ladder 30 is movably connected to one end of the telescopic ladder 20, and the base 10 is connected to the other end of the telescopic ladder 20.

[0053] The telescopic ladder 20 includes a telescopic ladder unit 22 and a locking mechanism 23. One end of the telescopic ladder unit 22 is slidably connected to the folding ladder 30, and the other end of the telescopic ladder unit 22 is connected to the base 10. The locking mechanism 23 is installed on the telescopic ladder unit 22 through structures such as a bracket or a support. The locking mechanism 23 is used to lock on the tread roller of the folding ladder 30 to keep the relative positions of the folding ladder 30 and the telescopic ladder unit 22 fixed.

[0054] Wherein, a guide groove 311 can be provided on one of the ladder unit 31 and the telescopic ladder unit 22, and a guide member 25 can be provided on the other of the ladder unit 31 and the telescopic ladder unit 22. The guide member 25 can be structures such as a slider or a guide pulley. The guide member 25 is slidably matched with the guide groove 311 to achieve guidance. According to the length required when the combined guide rail ladder is used, the relative positions of the ladder unit 31 and the telescopic ladder unit 22 can be adjusted, and then the locking mechanism 23 is used to position the ladder unit 31 and the telescopic ladder unit 22.

[0055] For example, in the embodiment of the present utility model, flanges are provided on both sides of the ladder unit 31 to form a guide groove 311. Guide members 25 are arranged at intervals on the vertical beam of the telescopic ladder unit 22. The guide members 25 are fixed to the vertical beam by means of structures such as bolts. The guide members 25 are inserted into the guide groove 311 and form a sliding connection with the guide groove 311. When it is necessary to lengthen the combined guide rail ladder, the ladder unit 31 and the telescopic ladder unit 22 are moved away from each other. At an appropriate position, the locking mechanism 23 is rotated to lock the telescopic ladder unit 22 in the tread of the ladder unit 31. Thus, the telescoping of one length of the combined guide rail ladder is completed. If it is necessary to change the telescopic length of the combined guide rail ladder, the above actions are repeated to complete the telescoping of different lengths.

[0056] The combined guide rail ladder provided by the embodiment of the present utility model adopts a modular design and is composed of a base 10, a telescopic ladder 20 and at least one folding ladder 30 to form a combined guide rail ladder, which can act as guide rails of multiple different lengths according to the use environment. Any two of the base 10, the telescopic ladder 20 and at least one folding ladder 30 can be combined to act as guide rails of multiple different lengths according to the use environment.

[0057] Continue to refer to Figure 2 and Figure 3 , a folding ladder 30 provided by the embodiment of the present utility model includes two ladder units 31 and a hinge assembly 32. The hinge assembly 32 is located between the two ladder units 31, and the folding ladder 30 is used to hinge the two ladder units 31.

[0058] Figure 4 is a schematic structural view of the hinge assembly provided by the embodiment of the present utility model. Figure 5 is a front view of the hinge assembly provided by the embodiment of the present utility model. Figure 6 is Figure 5 a sectional view along line A-A in Figure 7 is a sectional view of the hinged part in the hinge assembly provided by the embodiment of the present invention. Figure 8 is a side view of the hinge assembly provided by the embodiment of the present utility model. Figure 9 is Figure 8 a sectional view along line B-B in (in the folded state). Figure 10 is a sectional view of the hinge assembly provided by the embodiment of the present utility model (in the unfolded state).

[0059] Refer to Figures 4 to 10, an embodiment of the present utility model provides a hinge assembly 32, which can be applied to a folding ladder 30 or other components that can achieve a folding function. The embodiment of the present utility model will be described by taking the hinge assembly 32 applied to the folding ladder 30 as an example. The hinge assembly 32 includes a first hinge member 321, a second hinge member 322, and a hinge component 323, and the hinge component 323 is used to hinge the first hinge member 321 and the second hinge member 322.

[0060] Both the first hinge member 321 and the second hinge member 322 are plate-like structures, and the plate-like structure can be a steel plate composite structure or a sheet metal part. Both the first hinge member 321 and the second hinge member 322 are provided with a connection end and a hinge end. The connection end can be a rectangular plate-like structure, and a plurality of connection holes are provided on the connection end. The ladder unit 31 is connected to the corresponding connection holes through fasteners such as bolts to realize the fixed connection between the ladder unit 31 and the first hinge member 321 or the second hinge member 322. The hinge end can be a circular plate-like structure, and the hinge end mainly realizes the hinge and mutual limitation between the first hinge member 321 and the second hinge member 322.

[0061] Among them, in order to ensure the synchronism of the first hinge member 321 and the second hinge member 322, the connection end and the hinge end are integrally formed to form the first hinge member 321 or the second hinge member 322. Equivalently, the connection end and the hinge end are two parts on the first hinge member 321 or the second hinge member 322. There is a certain included angle between the extension lines of the center lines of the connection end and the hinge end, and this included angle makes the connection end and the hinge end never on the same straight line. The included angle between the extension lines of the center lines of the connection end and the hinge end can be an obtuse angle, specifically: 140°, 145°, 150°, 155°, or 160°, etc.

[0062] In order to increase the structural strength of the connection end, a reinforcing member 324 is provided on the connection end of each hinge member. A plurality of connection holes are correspondingly provided on the connection end and the reinforcing member 324. The ladder unit 31 is connected to the corresponding connection holes through fasteners such as bolts to realize the fixed connection between the ladder unit 31 and the first hinge member 321 or the second hinge member 322.

[0063] A first positioning hole 3211 and a first positioning groove 3212 are provided on the hinge end of one of the first hinge member 321 and the second hinge member 322, and a second positioning hole 3221 is provided on the hinge end of the other of the first hinge member 321 and the second hinge member 322.

[0064] That is, a first positioning hole 3211 and a first positioning groove 3212 can be formed at the hinged end of the first hinge member 321. Both the first positioning hole 3211 and the first positioning groove 3212 are eccentrically arranged relative to the center of the first hinge member 321. A second positioning hole 3221 is formed at the hinged end of the second hinge member 322, and the second positioning hole 3221 is eccentrically arranged relative to the center of the second hinge member 322. Alternatively, a first positioning hole 3211 and a first positioning groove 3212 can be formed at the hinged end of the second hinge member 322, and a second positioning hole 3221 is formed at the hinged end of the first hinge member 321.

[0065] Correspondingly, the first positioning hole 3211 and the first positioning groove 3212, as a combined positioning structure, are both eccentrically arranged relative to the axis of the first hinge member 321, and the second positioning hole 3221 is eccentrically arranged relative to the axis of the second hinge member 322. After the first hinge member 321 and the second hinge member 322 are unfolded relative to each other, on the premise of ensuring the positioning accuracy, the operation process can be simplified, and the unfolding and synchronous locking can be completed with one operation. When the first hinge member 321 and the second hinge member 322 are folded relative to each other, the folding and synchronous locking can be achieved with one operation.

[0066] The hinge component 323 includes a hinge shaft 3231, a bushing 3232, an elastic member 3233, a positioning component 3235, and a limiting component 3234. The bushing 3232 is sleeved outside the hinge shaft 3231, and the hinge shaft 3231 can move relative to the bushing 3232. A matching portion is provided on the bushing 3232. The elastic member 3233 is sleeved outside the hinge shaft 3231 and is located between the shoulder of the hinge shaft 3231 and the inner wall of the bushing 3232. The positioning component 3235 is fixedly connected to the hinge shaft 3231 and can move synchronously with the hinge shaft 3231 to be inserted into the first positioning hole 3211 and the second positioning hole 3221, or inserted into the first positioning groove 3212 and the second positioning hole 3221.

[0067] The limiting component 3234 is movably arranged on the hinge shaft 3231. The limiting component 3234 is used to cooperate with the bushing 3232 for limiting. The first hinge member 321 or the second hinge member 322 with the first positioning hole 3211 and the first positioning groove 3212 at the hinged end is fixedly matched with the bushing 3232.

[0068] When the hinge assembly is applied to the folding ladder 30 to make the folding ladder \(30\) in the unfolded state, the hinge shaft 3231 is pushed to move axially along its own axis to the left as shown in Figure 6 shown, and the hinge shaft 3231 drives the positioning component 3235 to move synchronously to the left, so that the positioning component 3235 disengages from the second positioning hole 3221 and the first positioning groove 3212.

[0069] At this time, the elastic member 3233 is in an elastically deformed state, that is, the elastic member 3233 has the ability to recover from elastic deformation. The limiting member 3234 provided on the hinge shaft 3231 moves leftward along with the hinge shaft 3231 and cooperates with the mating portion on the bushing 3232 for limiting to restrict the rotation and movement of the hinge shaft 3231 relative to the bushing 3232.

[0070] Then rotate the first hinge member 321 or the second hinge member 322 fixedly fitted with the bushing 3232. The first hinge member 321 or the second hinge member 322 drives the bushing 3232 to rotate synchronously to release the limiting effect of the mating member on the limiting member 3234. At this time, the elastic member 3233 recovers from elastic deformation to drive the hinge shaft 3231 to move rightward as shown in Figure 7 That is, the hinge shaft 3231 moves in the reverse direction to drive the positioning member 3235 to move rightward synchronously, so that the positioning member 3235 is inserted into the first positioning hole 3211. When the position of the second positioning hole 3221 does not correspond to the position of the first positioning hole 3211, the positioning member 3235 abuts against the hinge end surface of the first hinge member 321 or the second hinge member 322 and slides until the position of the second positioning corresponds exactly to the position of the first positioning hole 3211. Then, under the action of the elastic member 3233, the hinge shaft 3231 continues to move to make the positioning member 3235 inserted into the second positioning hole 3221, realizing the precise positioning of the first hinge member 321 relative to the second hinge member 322. At this time, the first hinge member 321 expands relative to the second hinge member 322, and the angle between the first hinge member 321 and the second hinge member 322 forms a flat angle.

[0071] Equivalently, when the hinge assembly is in the fully expanded state, locking and limiting are achieved, and there is no need to additionally attach a locking member for locking, which is simple to operate.

[0072] When the hinge assembly is applied to the folding ladder 30 to keep the folding ladder 30 in a folded state, push the hinge shaft 3231 to move leftward along its own axis as shown in Figure 6 That is, the hinge shaft 3231 drives the positioning member 3235 to move leftward synchronously, so that the positioning member 3235 disengages from the second positioning hole 3221 and the first positioning hole 3211.

[0073] At this time, the elastic member 3233 is in an elastically deformed state, that is, the elastic member 3233 has the ability to recover from elastic deformation. The limiting member 3234 provided on the hinge shaft 3231 moves leftward along with the hinge shaft 3231 and cooperates with the mating portion on the bushing 3232 for limiting to restrict the rotation and movement of the hinge shaft 3231 relative to the bushing 3232.

[0074] Rotate the first hinge member 321 or the second hinge member 322 fixedly engaged with the bushing 3232 again. The first hinge member 321 or the second hinge member 322 drives the bushing 3232 to rotate synchronously to release the limiting effect of the mating member on the limiting member 3234. At this time, the elastic member 3233 restores its elastic deformation to drive the hinge shaft 3231 to move to the right as shown in Figure 7 , that is, the hinge shaft 3231 moves in the reverse direction to drive the positioning member 3235 to move to the right synchronously, so that the positioning member 3235 is inserted into the first positioning groove 3212 and the second positioning hole 3221. When the position of the second positioning hole 3221 does not correspond to the position of the first positioning groove 3212, the positioning member 3235 abuts against the hinge end surface of the first hinge member 321 or the second hinge member 322 and slides until the position of the first positioning groove 3212 completely corresponds to the position of the second positioning hole 3221. Under the action of the elastic member 3233, the hinge shaft 3231 continues to move so that the positioning member 3235 is inserted into the second positioning hole 3221 to achieve rough positioning of the first hinge member 321 relative to the second hinge member 322. At this time, the first hinge member 321 folds relative to the second hinge member 322, and an acute angle is formed between the first hinge member 321 and the second hinge member 322, such as 30°, 40°, 45°, 50°, 55° or 60°.

[0075] That is, in the fully folded state, the hinge assembly also realizes locking and limiting, and there is no need to additionally attach a locking member for locking, and the operation is simple.

[0076] Since the first positioning groove 3212 has a certain length, in the folded state, by rotating the first hinge member 321 and the second hinge member 322 relative to each other, the folding ladder 30 applying this hinge assembly can be used as an "A"-shaped ladder. That is, the folding ladder 30 provided by the embodiment of the present invention can be used as an "A"-shaped ladder in the folded state and can also be used as a guide rail of a material conveyor in the unfolded state.

[0077] Among them, the hinge shaft 3231 is a stepped shaft, and the hinge shaft 3231 is provided with a plurality of shoulders according to the use requirements. The elastic member 3233 can be a spring. One end of the elastic member 3233 abuts against the shoulder of the hinge shaft 3231, and the other end of the elastic member 3233 abuts against the end face of the bushing 3232. It can be understood that the bushing 3232 is a cylindrical structure with a hollow interior. One end of the bushing 3232 is closed with an end face, and the end face is provided with a through hole for the hinge shaft 3231 to pass through. The other end of the bushing 3232 is open.

[0078] Among them, the limiting component 3234 may include an elastomer 3234-1 and a ball 3234-2. The elastomer 3234-1 is a structure such as a spring, and the ball 3234-2 is a steel column. The ball 3234-2 is fixedly connected to both ends of the elastomer 3234-1. A limiting hole 3231-1 is axially formed in the hinge shaft 3231 along its own axis. The elastomer 3234-1 is arranged in the limiting hole 3231-1, and the ball 3234-2 can be extruded into the limiting hole 3231-1 or protrude from the end face of the limiting hole 3231-1.

[0079] The mating part may be a limiting groove 3232-1. The limiting groove 3232-1 has a certain length, and the circumferential angle corresponding to the axial length of the limiting groove 3232-1 is less than or equal to 15°. After the ball 3234-2 is stuck into the limiting groove 3232-1, it can cooperate with the limiting groove 3232-1 to achieve limiting, so as to limit the movement and rotation of the hinge shaft 3231 relative to the bushing 3232.

[0080] In addition, the limiting component 3234 may also be an elastic piece. The elastic piece is arranged on the outer circumferential surface of the hinge shaft 3231, and a limiting protrusion is arranged on the elastic piece. The limiting protrusion can cooperate with the mating part to achieve limiting, so as to limit the movement and rotation of the hinge shaft 3231 relative to the bushing 3232.

[0081] Among them, the positioning component 3235 includes a positioning member 3235-1 and a positioning pin 3235-2. The positioning member 3235-1 may be a circular plate-like member or a strip-shaped link-like structure. The positioning member 3235-1 can be connected to the hinge shaft 3231 by interference fit. The positioning member 3235-1 can also be fixedly connected to the hinge shaft 3231 by a fastener. That is, an installation hole is formed in the positioning plate. The positioning member 3235-1 is sleeved on the hinge shaft 3231 through the installation hole, and a pin shaft or other structures are radially penetrated through the positioning plate for positioning and fixing.

[0082] In addition, when an installation hole is formed in the positioning member 3235-1, the hinge shaft 3231 connected to the positioning member 3235-1 can be set as a prismatic shape, and the installation hole can be set as a polygonal structure that matches the prismatic shape, so as to fix the positioning member 3235-1 on the hinge shaft 3231 through interference fit of the shaft hole.

[0083] The positioning pin 3235-2 may be a shaft-like part with a certain length. The positioning pin 3235-2 can be fixed on the positioning member 3235-1 by the matching method of the hinge shaft 3231 and the positioning member 3235-1 described above. For example, the positioning pin 3235-2 and the positioning member 3235-1 are fixedly connected by key connection, pin shaft connection or interference fit, so that the positioning plate can drive the positioning pin 3235-2 to move synchronously with the hinge shaft 3231.

[0084] In addition, the positioning member 3235 may also include a structure with an "L" - shaped cross - section integrally provided, that is, the positioning member 3235 includes a positioning portion and a pin portion. The positioning portion is fixedly connected to the hinge shaft 3231. In the unfolded state and the folded state, the pin portion is respectively inserted and matched with the first positioning hole 3211 and the second positioning hole 3221, and is inserted and matched with the first positioning groove 3212 and the second positioning hole 3221.

[0085] It can be understood that for the hinge assembly 32 provided by the embodiment of the present utility model, a first positioning hole 3211 and a first positioning groove 3212 are provided at the hinge end of one of the first hinge member 321 and the second hinge member 322, and a second positioning hole 3221 is provided at the hinge end of the other of the first hinge member 321 and the second hinge member 322. The first hinge member 321 and the second hinge member 322 are hinged by a hinge member 323, so that the hinge member 323 includes a hinge shaft 3231, a bushing 3232, an elastic member 3233, a limiting member 3234 and a positioning member 3235. The bushing 3232 is sleeved outside the hinge shaft 3231, and a matching portion is provided on the bushing 3232. The hinge member provided with the first positioning hole 3211 and the first positioning groove 3212 is fixedly matched with the bushing 3232; the elastic member 3233 is sleeved outside the hinge shaft 3231 and is located between the hinge shaft 3231 and the bushing 3232; the limiting member 3234 is movably arranged on the hinge shaft 3231 and is adapted to cooperate with the matching portion for limiting; the positioning member 3235 is fixedly arranged on the hinge shaft 3231 and is adapted to move with the hinge shaft 3231, so as to be inserted into the first positioning hole 3211 and the second positioning hole 3221 in the unfolded state, and to be inserted into the first positioning groove 3212 and the second positioning hole 3221 in the folded state.

[0086] With such a setting, during the unfolding process, until the first positioning hole 3211 and the second positioning hole are aligned, and the positioning member 3235 is inserted into the first positioning hole 3211 and the second positioning hole 3221, and cooperates with the first positioning hole 3211 and the second positioning hole 3221 to realize the limit with an eccentric setting relative to the axis of the hinge shaft 3231, locking is synchronously realized during the process of completing the unfolding, that is, unfolding and locking can be synchronously completed by one operation without additional locking parts for locking, the operation is simple, and the operation process can be simplified. Similarly, during the folding process, until the first positioning groove 3212 and the second positioning hole 3221 are aligned, and the positioning member 3235 is inserted into the first positioning groove 3212 and the second positioning hole 3221, and realizes the limit with an eccentric setting relative to the axis of the hinge shaft 3231, locking is synchronously realized during the process of completing the folding, that is, folding and locking can be synchronously completed by one operation without additional locking parts for locking, the operation is simple, and the operation process can be simplified, and problems of jamming and failure in the intermediate process can be reduced.

[0087] In addition, when the folding ladder 30 formed by connecting hinge components is applied to the combined guide rail climbing ladder, only the adjacent two folding ladders 30 need to be connected together through the connecting component 40. Since the folding ladder 30 only requires one operation to complete unfolding and locking, the operation is simple, which can simplify the assembly process. There is no need to assemble or piece together multiple standard sections, the assembly efficiency is high, the number of components on site is reduced, and the loss of components can be effectively avoided.

[0088] Continue to refer to Figure 6 and Figure 7 In some embodiments of the present invention, the positioning component 3235 includes a positioning member 3235-1 and a positioning pin 3235-2. The positioning member 3235-1 is fixedly connected to the hinge shaft 3231, and the positioning member 3235-1 can move with the hinge shaft 3231. The positioning pin 3235-2 is fixedly connected to the positioning member 3235-1 and can move with the hinge shaft 3231 under the drive of the positioning member 3235-1, so as to be inserted into the first positioning hole 3211 and the second positioning hole 3221 in the unfolded state, and to be inserted into the first positioning groove 3212 and the second positioning hole 3221 in the folded state.

[0089] The positioning member 3235-1 is a structure such as a pull plate, which is fixed on the hinge shaft 3231 and can perform linear reciprocating motion along its own axis with the hinge shaft 3231, so that the positioning pin 3235-2 moves with the positioning member 3235-1 and extends in and out of the corresponding hole or groove. That is, the hinge shaft 3231 transmits its own drive to the hinge shaft 3231 through the positioning member 3235-1, so that the positioning shaft can move parallel to the hinge shaft 3231.

[0090] Since the first positioning hole 3211 and the first positioning groove 3212 are eccentrically arranged relative to the axis of the hinge member, in order to make the position of the positioning pin 3235-2 correspond to the first positioning hole 3211 and the first positioning groove 3212, the axis of the positioning pin 3235-2 is parallel to the axis of the hinge shaft 3231. The hinge shaft 3231 and the positioning pin 3235-2 are linked through the positioning member 3235-1, and by controlling the movement of the hinge shaft 3231, the unlocking or locking operation of the positioning pin 3235-2 is driven.

[0091] Continue to refer to Figures 6 to 7 and at the same time refer to Figure 9 and Figure 10, in some embodiments of the present utility model, two sets of first positioning holes 3211 and first positioning grooves 3212 are provided on the corresponding hinge members. The first positioning holes 3211 in one set and the first positioning grooves 3212 in the other set are located on a first virtual circle, and the first positioning grooves 3212 in one set and the first positioning holes 3211 in the other set are located on a second virtual circle. The first virtual circle and the second virtual circle are concentric circles with the axis of the hinge shaft 3231 as the center.

[0092] That is, in order to improve the structural strength and stability of the hinge assembly, two sets of first positioning holes 3211 and first positioning grooves 3212 are provided on the corresponding hinge members.

[0093] For example, referring to Figure 6 and Figure 7 , a first positioning hole 3211A and a first positioning hole 3211B are provided on the first hinge member 321, and a first positioning groove 3212A and a first positioning groove 3212B are provided on the first hinge member 321. Among them, the first positioning hole 3211A and the first positioning groove 3212B are located on the first virtual circle, and the first positioning hole 3211B and the first positioning groove 3212A are located on the second virtual circle. That is, the first positioning holes 3211 and the first positioning grooves 3212 are arranged in pairs.

[0094] Correspondingly, two sets of second positioning holes 3221 are provided on the hinge member. For example: a second positioning hole 3221A and a second positioning hole 3221B are provided on the second hinge member 322. The projection of the second positioning hole 3221A is located on the first virtual circle, and the projection of the second positioning hole 3221B is located on the second virtual circle. Similarly, two sets of positioning pins 3235-2 are provided, namely the positioning pins 3235-2A and the positioning pins 3235-2B respectively. The positions of the two sets of positioning pins 3235-2 correspond to the positions of the two sets of second positioning holes 3221 one by one.

[0095] When the hinge assembly is in the unfolded state, the positioning pin 3235-2A is inserted into the first positioning hole 3211A and the second positioning hole 3221A, and the positioning pin 3235-2B is inserted into the first positioning hole 3211B and the second positioning hole 3221B to achieve precise positioning and locking of the hinge assembly, ensuring that the relative positions of the first hinge member 321 and the second hinge member 322 remain unchanged when unfolded, so that the hinge assembly can be used as a guide rail when connecting the folding ladder 30 composed of the ladder units 31 to be unfolded.

[0096] When the hinge assembly is in the folded state, the positioning pin 3235-2A is inserted into the first positioning groove 3212A and the second positioning hole 3221A, and the positioning pin 3235-2B is inserted into the first positioning groove 3212B and the second positioning hole 3221B to achieve rough positioning and locking of the hinge assembly, ensuring that the relative positions of the first hinge member 321 and the second hinge member 322 are nearly unchanged when folded. Since both the first positioning groove 3212A and the first positioning groove 3212B have a certain arc length, when the hinge assembly is in the folded state, the first hinge member 321 and the second hinge member 322 can be relatively unfolded by a certain angle, so that the folding ladder 30 composed of the ladder unit 31 connected to the first hinge member 321 and the ladder unit 31 connected to the second hinge member 322 can be used as an "A" ladder, that is, when the hinge assembly is in the folded state, it can be used as an "A" ladder when the first hinge member 321 and the second hinge member 322 are relatively rotated to the maximum angle.

[0097] In other words, the hinge assembly provided by the embodiment of the present invention uses a positioning pin 3235-2, a corresponding set of first positioning holes 3211 and first positioning grooves 3212, and corresponding second positioning holes 3221. When the hinge assembly is in the unfolded state, the positioning pin 3235-2 is inserted into the first positioning hole 3211 and the second positioning hole 3221 to achieve precise positioning and locking of the hinge assembly. When the hinge assembly is in the folded state, the positioning pin 3235-2 is inserted into the first positioning groove 3212 and the second positioning hole 3221 to achieve rough positioning and locking of the hinge assembly. That is, using a positioning pin 3235-2 can achieve the structural locking and positioning of the hinge assembly. However, the hinge end of the hinge member is a circular structure. When the first positioning hole 3211 and the first positioning groove 3212 are eccentrically arranged relative to the axis of the hinge member, the hinge end may deflect and get stuck. Therefore, first positioning holes 3211 and first positioning grooves 3212 are provided on both sides of the axis of the hinge member, and two positioning pins 3235-2 are correspondingly provided, which can ensure the structural stability and reliability.

[0098] In addition, since the first positioning groove 3212A and the first positioning groove 3212B are in different positions relative to the axis of the hinge member in the folded state, the arc lengths of the first positioning groove 3212A and the first positioning groove 3212B are set differently. Thus, after the positioning pin 3235-2A moves guidingly in the first positioning groove 3212A and the positioning pin 3235-2B rotates guidingly in the first positioning groove 3212B, the rotation angle of the first hinge member 321 relative to the second hinge member 322 is the same, and the folding amplitude is consistent.

[0099] Continue to refer to Figure 1 and Figures 3 to 8, in some embodiments of the present utility model, one of the first hinge member 321 and the second hinge member 322 is provided with a first hinge split body 3222 and a second hinge split body 3223. The first hinge split body 3222 and the second hinge split body 3223 are parallel and spaced apart. A receiving cavity 3224 is defined between the first hinge split body 3222 and the second hinge split body 3223. The second positioning hole 3221 penetrates through the first hinge split body 3222 and the second hinge split body 3223.

[0100] The hinge end of the other of the first hinge member 321 and the second hinge member 322 is clamped in the receiving cavity 3224. The hinge end of the other of the first hinge member 321 and the second hinge member 322 is provided with a first positioning hole 3211 and a first positioning groove 3212.

[0101] For example, when the first positioning hole 3211 and the first positioning groove 3212 are located on the first hinge member 321, the first hinge member 321 can be embedded in the second hinge member 322. That is, a receiving cavity 3224 is formed at the hinge end of the second hinge member 322. It is equivalent to that the second hinge member 322 is provided with a first hinge split body 3222 and a second hinge split body 3223. The first hinge split body 3222 and the second hinge split body 3223 are parallel and spaced apart to form a hinge end. A receiving cavity 3224 is defined between the first hinge split body 3222 and the second hinge split body 3223. The first hinge member 321 is located in the receiving cavity 3224.

[0102] Equivalently, the first hinge split body 3222 and the second hinge split body 3223 are symmetrically arranged at the hinge end of the first hinge member 321, so that the forces on the first hinge member 321 and the second hinge member 322 are uniform, and the structural stability is better, avoiding the asymmetric force of the structure caused by using a simple support beam and a cantilever beam, resulting in inclination or jamming.

[0103] Of course, it is also possible to provide a first hinge split body 3222 and a second hinge split body 3223 on the first hinge member 321, so that the second hinge member is clamped between the first hinge split body 3222 and the second hinge split body 3223. The specific structural setting is selected according to the actual use situation.

[0104] Figure 11 It is an exploded view of a partial structure of the hinge component 323 provided by an embodiment of the present utility model.

[0105] Refer to Figure 11, in some embodiments of the present utility model, the limiting member 3234 includes an elastic body 3234-1 and a ball 3234-2. The ball 3234-2 is arranged at both ends of the elastic body 3234-1; a limiting hole 3231-1 is formed in the hinge shaft 3231 along its own diameter direction, the elastic body 3234-1 is arranged in the limiting hole 3231-1, and the ball 3234-2 is adapted to extend out of or be received in the limiting hole 3231-1.

[0106] When the ball 3234-2 is squeezed by the bushing 3232, the ball 3234-2 compresses the elastic body 3234-1 to generate elastic deformation, so that the ball 3234-2 is received in the limiting hole 3231-1. At this time, the hinge shaft 3231 can rotate and move relative to the bushing 3232. Until the ball 3234-2 is embedded in the limiting groove 3232-1 on the bushing 3232, the hinge shaft 3231 is limited by the cooperation of the ball 3234-2 and the groove wall of the limiting groove 3232-1, so that the hinge shaft 3231 cannot rotate and move relative to the bushing 3232.

[0107] Continue to refer to Figure 4 、and at the same time refer to Figures 6 to 8 , in some embodiments of the present utility model, the hinge member 323 further includes a force applying member 3236. The force receiving area of the force applying member 3236 is larger than the force receiving area of the hinge shaft 3231, and the force applying member 3236 is fixedly arranged at one end of the hinge shaft 3231.

[0108] Equivalently, the force applying member 3236 is similar to the structure of the bushing 3232. The cross-sectional area of the force applying member 3236 is larger than the cross-sectional area of the hinge shaft 3231, so as to facilitate the application of force. At the same time, the force applying member 3236 can also block the connection part of the hinge shaft 3231 relative to the hinge member.

[0109] Refer to Figures 9 to 11 , in some embodiments of the present utility model, a protrusion 3232-2 is arranged on the outer side wall of the bushing 3232, and a clamping groove 3213 for clamping with the protrusion 3232-2 is arranged on the hinge member fixedly matched with the bushing 3232. The bushing 3232 and the hinge member can be synchronously driven through the cooperation of the protrusion 3232-2 and the groove.

[0110] When the folding ladder 30 needs to be in the unfolded state, a force is applied to the force applying member 3236. The force applying member 3236 pushes the hinge shaft 3231 to move to the left along its own axial direction in the direction shown in Figure 6 . The hinge shaft 3231 drives the positioning member 3235-1 fixedly connected thereto to move to the left synchronously, so that the positioning pin 3235-2 fixed on the positioning member 3235-1 is disengaged from the second positioning hole 3221 and the first positioning groove 3212.

[0111] At this time, the elastic member 3233 is in an elastically deformed state. The ball 3234-2 provided on the hinge shaft 3231 moves leftward along with the hinge shaft 3231 and cooperates with the limiting groove 3232-1 on the bushing 3232 for limiting. The rotation angle range of the limiting groove 3232-1 is 0-15 degrees. Beyond this range, the relative rotation and movement of the hinge shaft 3231 with respect to the bushing 3232 can be restricted.

[0112] The ball 3234-2 is restricted within the limiting groove 3232-1, causing the hinge shaft 3231 to stop moving. The climbing ladder unit 31 is rotated to drive the first hinge member 321 thereon. A clamping groove 3213 is provided on the first hinge member 321, and the clamping groove 3213 cooperates with the protrusion 3232-2 on the bushing 3232 for positioning, enabling the bushing 3232 and the first hinge member 321 to rotate together. When the relative rotation angle between the bushing 3232 and the first hinge member 321 is greater than 15 degrees, the ball 3234-2 slides out of the limiting groove 3232-1 on the bushing 3232.

[0113] At this time, under the elastic force of the elastic member 3233, it drives the hinge shaft 3231 to move rightward as shown in Figure 7 i.e., the hinge shaft 3231 moves in the reverse direction, driving the positioning member 3235 to move synchronously to the right, causing the positioning member 3235 to insert into the first positioning hole 3211. When the position of the second positioning hole 3221 does not correspond to the position of the first positioning hole 3211, the positioning member 3235 abuts against the hinge end surface of the first hinge member 321 or the second hinge member 322 and slides until the position of the second positioning completely corresponds to the position of the first positioning hole 3211. Then, under the action of the elastic member 3233, the hinge shaft 3231 continues to move, enabling the positioning member 3235 to insert into the second positioning hole 3221, achieving precise positioning of the first hinge member 321 relative to the second hinge member 322. At this time, the first hinge member 321 unfolds relative to the second hinge member 322.

[0114] When the folding ladder 30 needs to be in the folded state, a force is applied to the force-applying member 3236. The force-applying member 3236 pushes the hinge shaft 3231 to move leftward along its own axis as shown in Figure 6 i.e., the hinge shaft 3231 drives the positioning member 3235-1 fixedly connected thereto to move synchronously to the left, causing the positioning pin 3235-2 fixed on the positioning member 3235-1 to disengage from the second positioning hole 3221 and the first positioning hole 3211.

[0115] At this time, the elastic member 3233 is in an elastically deformed state. The limiting member 3234 provided on the hinge shaft 3231 moves leftward along with the hinge shaft 3231 and cooperates with the mating portion on the bushing 3232 for limiting to restrict the relative rotation and movement of the hinge shaft 3231 with respect to the bushing 3232.

[0116] Rotate the first hinge member 321 or the second hinge member 322 fixedly fitted with the bushing 3232 again. The first hinge member 321 or the second hinge member 322 drives the bushing 3232 to rotate synchronously to release the limiting effect of the fitting on the limiting member 3234.

[0117] At this time, the elastic member 3233 restores its elastic deformation to drive the hinge shaft 3231 to move to the right as shown in Figure 7 That is, the hinge shaft 3231 moves in the reverse direction to drive the positioning member 3235 to move to the right synchronously, so that the positioning member 3235 is inserted into the first positioning groove 3212 and the second positioning hole 3221. When the position of the second positioning hole 3221 does not correspond to the position of the first positioning groove 3212, the positioning member 3235 abuts against the hinge end surface of the first hinge member 321 or the second hinge member 322 and slides until the position of the first positioning groove 3212 completely corresponds to the position of the second positioning hole 3221. Under the action of the elastic member 3233, the hinge shaft 3231 continues to move, so that the positioning member 3235 is inserted into the second positioning hole 3221 to achieve the rough positioning of the first hinge member 321 relative to the second hinge member 322. At this time, the first hinge member 321 folds relative to the second hinge member 322.

[0118] Since the arc length of the first positioning groove 3212 can be correspondingly set with a central angle less than or equal to 15°, in the folded state, by rotating the first hinge member 321 and the second hinge member 322 relative to each other, the folding ladder 30 applying this hinge assembly can be unfolded to the maximum angle in the folded state and can be used as an "A"-shaped ladder.

[0119] Figure 12 It is one of the partial structural schematic diagrams of the combined guide rail climbing ladder provided by the embodiment of the present invention. Figure 13 It is Figure 12 The cross-sectional view along the D-D line in Figure 14 It is the side view of the combined guide rail climbing ladder provided by the embodiment of the present invention. Figure 15 It is Figure 14 One of the partial structural schematic diagrams of the combined guide rail climbing ladder shown in

[0120] Refer to Figures 12 to 15 In some embodiments of the present invention, the telescopic ladder unit 22 includes vertical beams and tread rollers. The tread rollers are arranged at intervals between two relatively arranged vertical beams, and the tread rollers are arranged in a hollow structure.

[0121] The locking mechanism 23 includes a quick-locking structure 231 and a locking block 232. The quick-locking structure 231 can quickly extend the locking block 232 to be clamped into the tread roller to achieve locking. The quick-locking structure 231 is fixedly connected to both sides of the telescopic ladder unit 22 through a support. The locking block 232 is connected to the quick-locking structure 231 through a locking rod. The quick-locking structure 231 can be a mechanism such as a cam, which can convert rotational motion into linear reciprocating motion, so as to push the locking block 232 to extend in and out of the tread roller through the locking rod to achieve locking and unlocking.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hinge assembly, characterized in that, Comprising: A first hinge member and a second hinge member, both the first hinge member and the second hinge member are provided with a connection end and a hinge end, and the connection end is adapted to connect to a ladder unit; a first positioning hole and a first positioning groove are provided on the hinge end of one of the first hinge member and the second hinge member, and a second positioning hole is provided on the hinge end of the other of the first hinge member and the second hinge member; A hinge component for hinging the first hinge member and the second hinge member, the hinge component includes a hinge shaft, a bushing, an elastic member, a limiting member and a positioning member, the bushing is sleeved outside the hinge shaft and fixedly cooperates with the hinge member provided with the first positioning hole and the first positioning groove, and a mating portion is provided on the bushing; the elastic member is sleeved outside the hinge shaft and is located between the hinge shaft and the bushing; the limiting member is movably arranged on the hinge shaft and is adapted to cooperate with the mating portion for limiting; the positioning member is fixedly arranged on the hinge shaft and is adapted to move along with the hinge shaft, so as to be inserted into the first positioning hole and the second positioning hole in the unfolded state, and to be inserted into the first positioning groove and the second positioning hole in the folded state.

2. The hinge assembly according to claim 1, wherein The positioning member includes: A positioning piece fixedly connected to the hinge shaft and adapted to move along with the hinge shaft; A positioning pin fixedly connected to the positioning piece and adapted to move along with the hinge shaft under the drive of the positioning piece, so as to be inserted into the first positioning hole and the second positioning hole in the unfolded state, and to be inserted into the first positioning groove and the second positioning hole in the folded state.

3. The hinge assembly according to claim 2, wherein There are two sets of the first positioning holes and the first positioning grooves on the corresponding hinge members, the first positioning holes in one set and the first positioning grooves in the other set are located on a first virtual circle, the first positioning grooves in one set and the first positioning holes in the other set are located on a second virtual circle, and the first virtual circle and the second virtual circle are concentric circles with the axis of the hinge shaft as the center; There are two sets of the corresponding second positioning holes on the corresponding hinge members, the projection of one set of the second positioning holes is located on the first virtual circle, and the projection of the other set of the second positioning holes is located on the second virtual circle; There are two sets of the positioning pins, and the positions of the two sets of the positioning pins correspond to the positions of the two sets of the second positioning holes one by one.

4. The hinge assembly according to claim 1, wherein One of the first hinge member and the second hinge member is provided with a first hinge split body and a second hinge split body, the first hinge split body and the second hinge split body are parallel and spaced apart, a receiving cavity is defined between the first hinge split body and the second hinge split body, and the second positioning hole penetrates through the first hinge split body and the second hinge split body; The hinge end of the other of the first hinge member and the second hinge member is clamped in the receiving cavity, and the first positioning hole and the first positioning groove are opened on the hinge end of the other of the first hinge member and the second hinge member.

5. The hinge assembly according to claim 1, characterized in that, The limiting member includes an elastic body and a ball, and the ball is arranged at both ends of the elastic body; A limiting hole is formed in the hinge shaft along its diameter direction, the elastic body is arranged in the limiting hole, and the ball is adapted to protrude from or be received in the limiting hole.

6. The hinge assembly according to any one of claims 1 to 5, characterized in that The hinge component further includes a force applying member, the cross-sectional area of the force applying member is larger than the cross-sectional area of the hinge shaft, and the force applying member is fixedly arranged at one end of the hinge shaft.

7. The hinge assembly according to any one of claims 1 to 5, characterized in that, A protrusion is arranged on the outer side wall of the bushing, and a clamping groove engaged with the protrusion is arranged on the hinge member fixedly matched with the bushing.

8. A folding ladder, characterized in that, It includes two ladder units and the hinge assembly according to any one of claims 1 to 7, and the hinge assembly is located between the two ladder units for hinging the two ladder units.

9. A combined guide rail ladder, characterized in that, It includes a base, a telescopic ladder and at least one folding ladder as claimed in claim 8, adjacent two of the folding ladders are connected by a connecting member, the folding ladder is movably connected to one end of the telescopic ladder, and the base is connected to the other end of the telescopic ladder.

10. The modular guide rail ladder according to claim 9, wherein, The telescopic ladder includes: a telescopic ladder unit, one end of the telescopic ladder unit is connected to the folding ladder, and the other end of the telescopic ladder unit is connected to the base; a locking mechanism, which is arranged on the telescopic ladder unit and is adapted to lock the folding ladder so that the positions of the folding ladder and the telescopic ladder unit are relatively fixed.

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