Vehicle transport vehicle and ladder device thereof

Abstract

The present invention provides a vehicle transport vehicle and a ladder device thereof. The ladder device includes a guide member, a ladder, a driving mechanism and a limiting mechanism. The guide member is arranged at the rear end of the vehicle transport vehicle and can slide along the length direction of the vehicle transport vehicle; the front end of the ladder is hingedly connected to the guide member; the driving mechanism is connected to the ladder and drives the ladder to move, and drives the guide member to slide, so that the ladder can slide to the bottom of the frame accommodated in the vehicle transport vehicle or extend out of the frame; the limiting mechanism is arranged corresponding to the rear end of the vehicle transport vehicle to stop the ladder when the front end of the ladder slides to the rear end of the vehicle transport vehicle; when the ladder extends out of the frame, the ladder tilts downward from front to back, and the upper surface of the front end of the ladder is flush with the upper surface of the rear end of the frame, and the rear end of the ladder abuts against the ground.

Description

Technical Field

[0001] The invention relates to the field of transport vehicles, and in particular to a vehicle transport vehicle and a ladder climbing device thereof. Background Art

[0002] When a transport vehicle is transporting a vehicle, a ladder is generally installed on the rear side of the transport vehicle to facilitate the vehicle to be transported to climb from the ground to the frame. Currently, the ladder is connected to the frame by a hook. When using it, the ladder must be pulled out from the storage area, and then the position of the ladder relative to the frame and the height of the ladder must be adjusted before the ladder can be hooked to the hook at the rear of the frame. The entire operation is complicated, time-consuming and labor-intensive, and affects the loading efficiency of the vehicle transport vehicle. Summary of the invention

[0003] The object of the present invention is to provide a ladder device with higher loading efficiency and a vehicle transport vehicle having the ladder device, so as to solve the problems in the prior art.

[0004] In order to solve the above technical problems, the present invention provides a ladder device for a vehicle transport vehicle, comprising: a guide member, which is arranged at the rear end of the vehicle transport vehicle and can slide along the length direction of the vehicle transport vehicle; a ladder, whose front end is hingedly connected to the guide member; a driving mechanism, which is connected to the ladder and drives the ladder to move, and drives the guide member to slide, so that the ladder can slide to the bottom of the frame accommodated in the vehicle transport vehicle or extend out of the frame; a limiting mechanism is arranged corresponding to the rear end of the vehicle transport vehicle to stop the ladder when the front end of the ladder slides to the rear end of the vehicle transport vehicle; when the ladder extends out of the frame, the ladder tilts downward from front to back, and the upper surface of the front end of the ladder is flush with the upper surface of the rear end of the frame, and the rear end of the ladder abuts the ground.

[0005] In one embodiment, the guide member includes a guide arm; the guide arm includes a first arm and a second arm connected along its own length direction, the angle between the first arm and the second arm is an obtuse angle, and the second arm is inclined upward from front to back.

[0006] In one embodiment, the guide arm has a second protrusion protruding downward, and the second protrusion is arranged in the middle of the guide arm.

[0007] In one embodiment, the outer circumference of the second protrusion is in an arc shape.

[0008] In one embodiment, the ladder device further includes a guide rail; the guide rail is fixed to the frame of the vehicle transport vehicle, and the guide rail extends along the length direction of the frame.

[0009] In one embodiment, the rear end of the guide rail has an inclined surface that slopes upward from front to rear.

[0010] In one embodiment, the limiting mechanism includes a limiting block fixed to the rear end of the frame, and the front end of the ladder has a first protrusion, and the limiting block stops the first protrusion to limit the ladder.

[0011] In one embodiment, the driving mechanism includes a first end and a second end that can be close to or away from the first end; the first end is connected to the middle part of the frame in the length direction, the second end is located at the rear end of the first end, and the second end is connected to the middle part of the length direction of the ladder, so that the second end extends downwardly from front to back relative to the first end.

[0012] In one embodiment, the ladder includes: a main ladder, whose front end is connected to the rear end of the guide member; and an auxiliary ladder, rotatably connected to the rear end of the main ladder, so that the auxiliary ladder can be flipped to be stacked on the main ladder or extend outward from the main ladder.

[0013] The present invention also provides a vehicle transport vehicle, comprising a vehicle frame and the ladder device as described above, wherein the ladder device is located at the rear end of the vehicle frame and can be accommodated at the bottom of the vehicle frame or extend outward from the vehicle frame.

[0014] It can be seen from the above technical solution that the advantages and positive effects of the present invention are:

[0015] The ladder device of the present invention includes a guide member, a ladder, a driving mechanism and a limiting mechanism. The front end of the ladder is hingedly connected to the guide member, and the ladder and the guide member are driven by the driving mechanism to slide along the length direction of the vehicle transport vehicle, so that the ladder can slide to the bottom of the frame accommodated in the vehicle transport vehicle or extend out of the frame, and when the ladder extends out of the frame, the ladder tilts downward from front to back, and the upper surface of the front end of the ladder is flush with the upper surface of the rear end of the frame, and the rear end of the ladder abuts against the ground. The limiting mechanism stops the ladder when the front end of the ladder slides to the rear end of the vehicle transport vehicle. Through the cooperation of the guide member and the driving mechanism, the ladder device can be extended out of the frame to meet the use requirements. The entire operation is convenient and feasible, and the loading efficiency of the transport vehicle is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial structural schematic diagram of one embodiment of the vehicle transport vehicle of the present invention, wherein the ladder device is accommodated at the bottom of the vehicle frame;

[0017] Figure 2 It is a partial structural schematic diagram of one embodiment of the vehicle transport vehicle of the present invention, wherein the ladder device extends outwardly from the vehicle frame;

[0018] Figure 3 is a side view of one embodiment of the ladder climbing device of the present invention;

[0019] Figure 4 The present invention Figure 3 A partial enlarged view of the connection between the middle guide rail, guide piece and ladder;

[0020] Figure 5 is a top view of one embodiment of the ladder climbing device of the present invention;

[0021] Figure 6 The present invention Figure 5 A top view of the middle guide and the ladder;

[0022] Figure 7 The present invention Figure 5 A partial enlarged view of the connection between the main ladder and the auxiliary ladder.

[0023] Among them, the accompanying drawings are described as follows: 1. frame; 2. walking mechanism; 3. ladder device; 31. guide rail; 311. lifting wedge; 32. guide member; 321. guide arm; 3211. first arm; 3212. second arm; 3213. first protrusion; 3214. second protrusion; 322. connecting arm; 33. ladder; 331. main ladder; 3311. main ladder body; 3312. roller; 332. auxiliary ladder; 34. driving mechanism; 341. mounting seat; 3411. fixing plate; 3412. mounting plate; 342. bracket; 343. cylinder body; 344. telescopic rod; 351. limit block. DETAILED DESCRIPTION

[0024] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0025] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0026] The present invention provides a vehicle transporter for transporting vehicles, wherein the vehicles may be passenger vehicles, such as sedans.

[0027] See also Figure 1 and Figure 2 The vehicle transport vehicle mainly comprises a frame 1, a running mechanism 2 and a ladder device 3. The ladder device 3 is located at the rear end of the frame 1 and can extend outward from the frame 1 to facilitate the loading and unloading of the vehicle. The ladder device 3 can also be stored at the bottom of the frame 1 after the loading and unloading of the vehicle is completed, which is convenient for the vehicle transport vehicle to travel.

[0028] When describing the orientation, the present invention takes the length direction of the vehicle transport vehicle as the longitudinal direction, the width direction of the vehicle transport vehicle as the transverse direction, the direction toward the front of the vehicle transport vehicle as the front, and the opposite direction as the rear.

[0029] The embodiment of the present invention is mainly aimed at optimizing the ladder 33 and the connection method related thereto, while the related structures of the frame 1 and the traveling mechanism 2 can refer to the related art.

[0030] See also Figure 3 and Figure 5 The ladder device 3 includes a guide rail 31, a guide member 32, a ladder 33, a driving mechanism 34 and a limiting mechanism.

[0031] The guide rail 31 is fixed on the frame 1 of the vehicle transporter, and the guide rail 31 extends along the length direction of the frame 1, that is, the guide rail 31 extends in the longitudinal direction. Specifically, in this embodiment, there are two guide rails 31, which are arranged in parallel and spaced apart in the transverse direction.

[0032] The guide rail 31 may be a longitudinal beam of the vehicle frame 1, or may be a structure separately fixed to the vehicle frame 1. When the guide rail 31 is a structure independent of the longitudinal beam of the vehicle frame 1, it may be fixedly connected to the longitudinal beam of the vehicle frame 1, or may be fixedly connected to the cross beam of the vehicle frame 1. The guide rail 31 extends horizontally.

[0033] In this embodiment, the two guide rails 31 are fixed to the inner sides of the two longitudinal beams of the frame 1. The area defined by the two longitudinal beams is the inner side, and the area opposite to the inner side is the outer side.

[0034] Specifically, the guide rail 31 is hollow inside to allow sliding.

[0035] The rear end of the guide rail 31 has an inclined surface. The inclined surface is inclined upward from front to back. In practical applications, the inclined surface can be formed by fixing a lifting wedge 311 inside the rear end of the guide rail 31. The cross section of the lifting wedge 311 is triangular.

[0036] The guide member 32 includes two guide arms 321 and a connecting arm 322 connecting the two guide arms 321 .

[0037] The two guide arms 321 are arranged one-to-one with the two guide rails 31 , that is, the two guide arms 321 are arranged at intervals in the transverse direction. Each guide arm 321 extends longitudinally and slidably cooperates with the corresponding guide rail 31 , so that the guide arm 321 can slide along the corresponding guide rail 31 .

[0038] See also Figure 4, each guide arm 321 includes a first arm 3211 and a second arm 3212 connected in the longitudinal direction. Specifically, the angle between the first arm 3211 and the second arm 3212 is an obtuse angle, and the first arm 3211 is inclined downward from front to back, and the second arm 3212 is inclined upward from front to back. Among them, the side facing the inside of the frame 1 is the inner side, and the opposite side is the outer side. In practical applications, the outer circumference of the bottom of the connection between the first arm 3211 and the second arm 3212 is in an arc transition, that is, the outer circumference of the guide arm 321 in contact with the guide rail 31 is in an arc shape, thereby reducing the friction between the guide arm 321 and the guide rail 31.

[0039] Furthermore, a first convex block 3213 protruding upward is provided at the front end of the first arm 3211. The outer circumference of the first convex block 3213 is in an arc shape.

[0040] A second protrusion 3214 protruding downward is provided at the rear end of the first arm 3211. The outer periphery of the second protrusion 3214 is in an arc shape.

[0041] The front end of the second arm 3212 is connected to the rear end of the first arm 3211 , and the connection between the second arm 3212 and the first arm 3211 is located behind the second protrusion 3214 .

[0042] A connecting hole is formed at the rear end of the second arm 3212, and the axis of the connecting hole extends transversely.

[0043] In this embodiment, the length of the second arm 3212 is shorter than the length of the first arm 3211 .

[0044] The connecting arm 322 connects and fixes the two first arms 3211 , and the connection point between the connecting arm 322 and the first arms 3211 is located between the first protrusion 3213 and the second protrusion 3214 in the longitudinal direction.

[0045] See also Figure 5 and Figure 6 The ladder 33 includes a main ladder 331 and an auxiliary ladder 332 .

[0046] The main ladder 331 includes a main ladder body 3311 and a roller 3312 disposed at the rear end of the main ladder body 3311 .

[0047] The main ladder body 3311 includes two parallel side beams spaced apart and a plurality of connecting beams connected between the two side beams. The side beams extend longitudinally and the two side beams are located inside the two guide arms 321. The area facing the area defined between the two guide arms 321 is the inside, and the area facing the outside is the opposite.

[0048] The front end of the side beam is provided with a through hole. A pin extending laterally is inserted into the connecting hole on the second arm 3212 and the through hole on the side beam at the same time, so as to realize the hinged connection between the main ladder body 3311 and the guide member 32, thereby realizing the hinged connection between the ladder 33 and the guide member 32.

[0049] The rear end of the side beam is provided with an opening.

[0050] See also Figure 7 The roller shaft extends in the horizontal direction and penetrates the openings of the two side beams, that is, the roller shaft is arranged at the rear end of the main ladder body 3311. The roller 3312 is sleeved on the roller shaft and can rotate around the roller shaft.

[0051] There are multiple rollers 3312, which are sleeved on the roller shaft at intervals. In this embodiment, there are four rollers 3312, all located between the two side beams. Among them, the two rollers located at the ends of the roller shaft are end rollers 3312, and the two rollers located in the middle of the roller shaft are middle rollers 3312. A spacer is provided between the end rollers 3312 and the middle rollers 3312, and the spacer is sleeved on the roller shaft to keep the end rollers 3312 and the middle rollers 3312 spaced apart.

[0052] When the main ladder body 3311 gradually extends out of the frame 1 and approaches the ground, the rollers 3312 touch the ground first, and the main ladder body 3311 can be moved smoothly in the longitudinal direction by the rollers 3312 around the roller shafts.

[0053] The auxiliary ladder 332 is rotatably connected to the rear end of the main ladder body 3311 so as to be relatively close to or away from the front end of the main ladder body 3311, so that the auxiliary ladder 332 can be stacked on the main ladder body 3311 to facilitate the storage of the climbing ladder 33, or the auxiliary ladder 332 can be extended out of the main ladder body 3311 to load and unload vehicles. The two side surfaces of the auxiliary ladder 332 are respectively a first side surface and a second side surface. When the auxiliary ladder 332 rotates toward the direction close to the front end, the first side surface of the auxiliary ladder 332 can be attached to the surface of the main ladder body 3311, so that the auxiliary ladder 332 is folded on the main ladder body 3311. When the auxiliary ladder 332 rotates toward the direction away from the front end, the auxiliary ladder 332 extends out of the main ladder body 3311 and abuts against the ground, which is convenient for loading and unloading vehicles.

[0054] Specifically, the auxiliary ladder 332 is shorter than the main ladder 331 .

[0055] The driving mechanism 34 has a first end and a second end. The second end moves relative to the first end to approach or move away from the first end. The first end is connected to the frame 1, and the second end is connected to the rear end of the main ladder 331, thereby driving the main ladder 331 to move.

[0056] In this embodiment, the driving mechanism 34 is a hydraulic cylinder, which specifically includes a mounting seat 341 , a bracket 342 , a cylinder body 343 and a telescopic rod 344 .

[0057] The mounting seat 341 is fixed to the middle of the frame 1. Specifically, the mounting seat 341 is fixed to the middle of the longitudinal direction and the middle of the transverse direction of the frame 1. In the present application, the middle of the longitudinal direction of the frame 1 does not specifically refer to the exact center position of the frame 1 in the length direction, but refers to an area within a certain length range including the exact center position of the frame 1 in the length direction, excluding the ends of the frame 1 in the length direction. The transverse middle of the frame 1 does not specifically refer to the exact center position of the frame 1 in the width direction, but refers to an area within a certain width range including the exact center position of the frame 1 in the width direction, excluding the ends of the frame 1 in the width direction.

[0058] In this embodiment, in the longitudinal direction, the mounting seat 341 is located at the rear end of the walking mechanism 2. In the transverse direction, the mounting seat 341 is located at the transverse center of the frame 1.

[0059] The mounting seat 341 includes a fixing plate 3411 and a mounting plate 3412. The fixing plate 3411 is arranged vertically and extends in the transverse direction, and its top is fixedly connected to the bottom of the frame 1. The mounting plate 3412 is perpendicular to the fixing plate 3411 and faces the rear end. The mounting plate 3412 is arranged vertically and extends in the longitudinal direction. A mounting hole is provided on the mounting plate 3412, and the axis of the mounting hole extends in the transverse direction. Specifically, the mounting hole is an elongated hole extending in the vertical direction.

[0060] The bracket 342 and the mounting seat 341 are arranged parallel to each other in the longitudinal direction and are located on the same straight line in the longitudinal direction. The bracket 342 is close to the rear end of the frame 1 .

[0061] The bracket 342 includes a connecting plate, a supporting plate and a supporting block. The connecting plate is arranged vertically, and its top is fixedly connected to the bottom of the frame 1. The length of the connecting plate along the longitudinal direction decreases from the top to the bottom. The supporting plate is vertically connected to the bottom of the connecting plate, and the supporting plate is arranged horizontally and extends in the transverse direction. The supporting block is located on the supporting plate. Among them, the upper surface of the supporting block is lower than the lower peripheral wall of the mounting hole of the mounting plate 3412.

[0062] The cylinder body 343 extends in the longitudinal direction, and its front end is slidably connected with the mounting seat 341, and its rear end extends toward the rear end of the vehicle frame 1. The front end of the cylinder body 343 has two mounting ears arranged at intervals, and each mounting ear is provided with an assembly hole. When the cylinder body 343 is connected to the mounting seat 341, the two mounting ears are arranged on both sides of the mounting plate 3412, that is, the mounting plate 3412 is located between the two mounting ears, and the connection between the cylinder body 343 and the mounting seat 341 is realized by penetrating two assembly holes and the mounting hole through the pin shaft. The pin shaft slides vertically in the mounting hole, thereby driving the front end of the cylinder body 343 to move in the vertical direction.

[0063] The telescopic rod 344 is disposed in the cylinder body 343 and can move in the cylinder body 343. The telescopic rod 344 has a first end and a second end. When the telescopic rod 344 is received in the cylinder body 343, the first end is close to the front end of the cylinder body 343, and the second end is close to the rear end. The second end is connected to the rolling shaft at the rear end of the main ladder 331. Specifically, the second end is located between the two middle rollers 3312.

[0064] The front end of the cylinder body 343 constitutes the sliding end of the driving mechanism 34 , and the second end of the telescopic rod 344 constitutes the free end of the driving mechanism 34 .

[0065] The driving mechanism 34 drives the ladder 33 in the following way: the telescopic rod 344 extends out of the cylinder 343, and the telescopic rod 344 drives the main ladder 331 to move outward. As the main ladder 331 extends outward, the rear end of the main ladder 331 tilts downward, causing the telescopic rod 344 to tilt downward from front to back, and drives the front end of the cylinder 343 to slide upward, causing the cylinder 343 to tilt downward from front to back, and at this time, the middle of the cylinder 343 falls on the bracket 342, so that the cylinder 343 is supported by the bracket 342. The telescopic rod 344 continues to extend until the main ladder 331 stops moving.

[0066] The limiting mechanism includes a limiting block 351 provided corresponding to the two guide rails 31. Specifically, the limiting block 351 is provided at the rear end of the corresponding guide rail 31 to stop the first protrusion 3213 of the ladder 33, thereby limiting the ladder 33 from continuing to move backward. That is, the limiting block 351 is located behind the first protrusion 3213 and abuts against the first protrusion 3213 to stop the ladder 33 from continuing to move backward. In this embodiment, along the longitudinal direction, the limiting block 351 is located in front of the lifting wedge 311. And the interval between the limiting block 351 and the lifting wedge 311 satisfies the following condition: when the limiting block 351 abuts against the first protrusion 3213, the second protrusion 3214 is located on the lifting wedge 311.

[0067] Specifically, the front end of the limiting block 351 has an inclined surface, and the inclined surface is inclined downward from front to back.

[0068] With the ladder 33 stored at the bottom of the frame 1 as the initial state, when the vehicle needs to be loaded or unloaded, the method of using the ladder device 3 in this embodiment is as follows:

[0069] S1, start the driving mechanism 34 to extend the telescopic rod 344 outward.

[0070] Specifically, the telescopic rod 344 extends toward the rear end. The extension of the telescopic rod 344 drives the ladder 33 to move backward, and drives the guide member 32 to slide backward along the guide rail 31.

[0071] As the ladder 33 is extended, the gravity of the extended part causes the ladder 33 and the telescopic rod 344 to tilt downward from front to back. The front end of the ladder 33 is hingedly connected to the guide member 32, and the front end of the cylinder 343 is hingedly connected to the mounting seat 341, so that the ladder 33, the cylinder 343, and the telescopic rod 344 can tilt and rotate downward from front to back.

[0072] S2. The telescopic rod 344 continues to extend until the limit block 351 limits the movement of the ladder 33, so that the ladder 33 can no longer move.

[0073] Specifically, as the telescopic rod 344 continues to extend, the roller 3312 of the main ladder 331 touches the ground first, and then rolls on the ground, and continues to drive the ladder 33 to extend backward.

[0074] When the first protrusion 3213 of the guide member 32 abuts against the limiting block 351 , the guide member 32 cannot move backward any further, and thus the ladder 33 cannot move backward any further.

[0075] At this time, the upper surface of the front end of the main ladder 331 is flush with the upper surface of the rear end of the frame 1. Specifically, the lifting wedge 311 supports the second protrusion 3214, raises the guide arm 321, and cooperates with the structure of the guide arm 321, thereby raising the front end of the main ladder 331.

[0076] S3. Flip the auxiliary ladder 332 from front to back so that the rear end of the auxiliary ladder 332 contacts the ground, and then load and unload the vehicle.

[0077] Specifically, when the auxiliary ladder 332 is rotated in a direction away from the front end, the auxiliary ladder 332 extends out of the main ladder 331 and abuts against the ground, and the entire ladder 33 tilts downward from front to back.

[0078] After loading and unloading the vehicle, the steps for storing the ladder device 3 are opposite to the above steps.

[0079] It can be seen from the above technical solution that the advantages and positive effects of the present invention are:

[0080] The ladder device of the present invention includes a guide member, a ladder, a driving mechanism and a limiting mechanism. The front end of the ladder is hingedly connected to the guide member, and the ladder and the guide member are driven by the driving mechanism to slide along the length direction of the vehicle transport vehicle, so that the ladder can slide to the bottom of the frame accommodated in the vehicle transport vehicle or extend out of the frame, and when the ladder extends out of the frame, the ladder tilts downward from front to back, and the upper surface of the front end of the ladder is flush with the upper surface of the rear end of the frame, and the rear end of the ladder abuts against the ground. The limiting mechanism stops the ladder when the front end of the ladder slides to the rear end of the vehicle transport vehicle. Through the cooperation of the guide member and the driving mechanism, the ladder device can be extended out of the frame to meet the use requirements. The entire operation is convenient and feasible, and the loading efficiency of the transport vehicle is effectively improved.

[0081] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, such as: Therefore, all changes and modifications that fall within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A ladder climbing device for a vehicle transport vehicle, characterized in that: include: A guide member, disposed at the rear end of the vehicle transporter and capable of sliding along the length direction of the vehicle transporter; A ladder, the front end of which is hingedly connected to the guide member; A driving mechanism connected to the ladder and driving the ladder to move, and driving the guide member to slide, so that the ladder can slide to the bottom of the frame accommodated in the vehicle transport vehicle or extend out of the frame; A limiting mechanism is provided corresponding to the rear end of the vehicle transport vehicle to stop the ladder when the front end of the ladder slides to the rear end of the vehicle transport vehicle; When the ladder is extended out of the frame, the ladder is tilted downward from front to back, and the upper surface of the front end of the ladder is flush with the upper surface of the rear end of the frame, and the rear end of the ladder is in contact with the ground; the guide member includes a guide arm; the guide arm includes a first arm and a second arm connected along its own length direction, the angle between the first arm and the second arm is an obtuse angle, and the second arm is tilted upward from front to back.

2. The ladder climbing device according to claim 1, characterized in that: The guide arm has a second protrusion protruding downward, and the second protrusion is arranged in the middle of the guide arm.

3. The ladder climbing device according to claim 2, characterized in that: The outer circumference of the second protrusion is in an arc shape.

4. The ladder climbing device according to claim 1, characterized in that: The ladder climbing device also includes a guide rail; the guide rail is fixed on the frame of the vehicle transport vehicle, and the guide rail extends along the length direction of the frame.

5. The ladder climbing device according to claim 4, characterized in that: The rear end of the guide rail has an inclined surface which is inclined upward from front to rear.

6. The ladder climbing device according to claim 1, characterized in that: The limiting mechanism comprises a limiting block fixed to the rear end of the frame, the front end of the ladder has a first protrusion, and the limiting block stops the first protrusion to limit the ladder.

7. The ladder climbing device according to claim 1, characterized in that: The driving mechanism includes a first end and a second end that can be close to or away from the first end; the first end is connected to the middle part of the length direction of the frame, the second end is located at the rear end of the first end, and the second end is connected to the middle part of the length direction of the ladder so that the second end extends downwardly from front to back relative to the first end.

8. The ladder climbing device according to claim 1, characterized in that: The ladder comprises: A main ladder, the front end of which is hingedly connected to the rear end of the guide member; The auxiliary ladder is rotatably connected to the rear end of the main ladder so that the auxiliary ladder can be turned over to be stacked on the main ladder or extended outward from the main ladder.

9. A vehicle transporter, characterized in that: It comprises a vehicle frame and a ladder device as described in any one of claims 1 to 8, wherein the ladder device is located at the rear end of the vehicle frame and can be accommodated at the bottom of the vehicle frame or extend outward from the vehicle frame.

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