Lifting trailer with adjustable wheel distance

Abstract

The invention discloses a lifting trailer with an adjustable wheel distance, and belongs to the technical field of trailers, the lifting trailer comprises a traction seat connected with a tractor, a guide rod is fixedly mounted on the rear side of the traction seat, a center frame is fixedly mounted at the rear end of the guide rod, two sides of the center frame are movably connected with a frame, and the outer side of the center frame is rotatably connected with wheels; the connecting assemblies are connected between the central frame and the frame and between the traction seat and the frame; the sliding seat is slidably mounted on the outer side of the guide rod, and a fourth connecting rod is rotatably connected between the sliding seat and the frame; the lubricating assembly is arranged on the sliding seat, and the outer side of the guide rod is automatically cleaned and lubricated through movement of the sliding seat; and the water tank is fixedly mounted on the lower surface of the frame. According to the lifting trailer with the adjustable wheel track, the wheel track can be conveniently and rapidly adjusted, the adjusting mechanism can be automatically cleaned and lubricated in the adjusting process, and meanwhile lateral abrasion borne by tires can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of trailers, in particular to a lifting trailer with adjustable wheel spacing. Background Art

[0002] A lift trailer is a multifunctional mobile logistics equipment, which is mainly used for carrying heavy objects and trailers, and has the functions of lifting, moving and towing. It is widely used in factories, warehouses and other occasions. The existing trailer frame structure is fixed and the wheelbase cannot be adjusted according to the use requirements, which has certain use defects.

[0003] The prior art (application number: 202010584948.1, Chinese patent with application date of 2020-06-24) discloses a trailer for the production of precast concrete parts, including a cargo rack arranged on a frame, the frame including four frame bodies and four half-axle assemblies connected to the frame bodies, the half-axle assembly including a bidirectional pump, a movable shaft, a driving rod and a fixed shaft extending along the width direction of the trailer, a sliding cavity extending along the length direction of the fixed shaft is provided in the fixed shaft, a sliding block is connected to the sliding cavity in a sliding seal, the sliding block divides the sliding cavity into an inner cavity and an outer cavity, one end of the driving rod is connected to the movable shaft, and the other end is connected to the sliding block after passing through the outer cavity, the inner cavity and the outer cavity are filled with hydraulic oil, the bidirectional pump is used to make the hydraulic oil reciprocate between the inner cavity and the outer cavity so that the movable shaft can be extended relative to the fixed shaft, and the movable shaft is connected to a running wheel. The present invention has the advantage that the wheelbase of each wheel from the center of the vehicle body can be adjusted independently, which solves the problem that the existing trailer cannot adapt to different road widths; However, the lifting trailer in the prior art cannot automatically lubricate the adjustment mechanism synchronously when adjusting the wheelbase, which makes the adjustment mechanism prone to rapid wear during the reciprocating adjustment process, thereby affecting the service life of the equipment and having certain usage defects. Summary of the invention

[0004] The purpose of the present invention is to provide a lifting trailer with adjustable wheelbase, so as to solve the problem raised by the above background technology that it is inconvenient to synchronously and effectively lubricate the adjusting mechanism of the lifting trailer on the market when adjusting the wheelbase.

[0005] To achieve the above object, the present invention provides the following technical solution: a lifting trailer with adjustable wheelbase, comprising a traction seat connected to a tractor, a guide rod fixedly installed on the rear side of the traction seat, a center frame fixedly installed on the rear end of the guide rod, and a vehicle frame movably connected to both sides of the center frame, and a wheel rotatably connected to the outer side; It also includes: a connecting assembly connected between the center frame and the frame and between the traction seat and the frame; a sliding seat slidably installed on the outer side of the guide rod, and a fourth connecting rod is rotatably connected between the sliding seat and the frame; a lubricating assembly is arranged on the sliding seat, and automatic cleaning and lubrication of the outer side of the guide rod is achieved through the movement of the sliding seat; a water tank is fixedly installed on the lower surface of the frame.

[0006] Preferably, the connecting assembly includes a first connecting rod and a second connecting rod rotatably connected between the center frame and the frame, and the first connecting rod and the second connecting rod are arranged in parallel, and a third connecting rod is rotatably connected between the front end of the frame and the traction seat, and a hydraulic rod is rotatably connected between the third connecting rod and the traction seat, and the hydraulic rod drives the third connecting rod to rotate during the telescopic adjustment process.

[0007] By adopting the above technical solution, when the hydraulic rod is controlled to perform telescopic adjustment, the third connecting rod, the first connecting rod and the second connecting rod can be driven to perform rotational adjustment, thereby changing the distance between the two frames and realizing the adjustment of the trailer wheel track.

[0008] Preferably, the slide seat is slidably sleeved on the outside of the guide rod, and a fourth connecting rod is hinged between the slide seat and the frame.

[0009] By adopting the above technical solution, when the frame is adjusted, it can drive the sliding seat to slide back and forth on the outer side of the guide rod through the fourth connecting rod.

[0010] Preferably, the lubrication assembly includes an oil tank fixedly mounted below the slide seat, and the oil tank is arranged in a concave shape, and a cam is elastically rotatably connected to the inner side of the oil tank, and a pull rope is wound around the outer side of the shaft of the cam, and the pull rope is close to the outer side of the traction seat.

[0011] By adopting the above technical solution, when the slide seat moves, the pull rope can drive the cam to rotate elastically.

[0012] Preferably, the lubrication assembly also includes two piston cylinders symmetrically fixedly mounted on the oil tank, and the inner side of the piston cylinder is telescopically connected to a pull rod, and the end of the pull rod close to the cam is elastically rotatably connected to a rotating rod, and at the same time, the rotating rods connected to the ends of the two pull rods have opposite rotation directions, and the cam pushes the two rotating rods to slide and rotate respectively during the forward and reverse rotation process.

[0013] By adopting the above technical solution, when the cam rotates clockwise, it can push the rotating rod on the right to move and push the rotating rod on the left to rotate, so that different rotating rods can be driven to move by adjusting the rotation direction of the cam, thereby adjusting the position of the pull rod.

[0014] Preferably, one end of the pull rod located on the inner side of the piston cylinder is fixedly connected to a piston plate, and the piston plate is slidingly connected to the inner side of the piston cylinder by interference fit, and a spring is connected between the piston plate and the piston cylinder, and an oil suction pipe is connected between the piston cylinder and the oil tank, and an oil delivery pipe is also connected to the outer side of the piston cylinder, and both the oil suction pipe and the oil delivery pipe are provided with a one-way valve structure.

[0015] By adopting the above technical solution, when the piston plate elastically slides on the inner side of the piston cylinder, the lubricating oil in the oil tank can be extracted through the oil suction pipe and transported through the oil delivery pipe.

[0016] Preferably, the lubrication assembly also includes a movable seat symmetrically rotatably installed at both ends of the sliding seat, and a cavity is opened on the inner side of the movable seat, and the cavity inside the movable seat is connected to the oil pipeline. At the same time, the movable seat and the guide rod are coaxially arranged, and the inner wall of the movable seat is evenly opened with spray holes connected to its inner cavity.

[0017] By adopting the above technical solution, when the sliding seat moves and adjusts, the movable seat can spray lubricating oil to the outer wall of the guide rod through the spray hole.

[0018] Preferably, a cleaning brush is evenly and fixedly connected to the inner wall of the movable seat, and the cleaning brush is attached to the outer wall of the guide rod, and a ball is embedded and installed on the outer side of the movable seat, and a guide plate parallel to the guide rod is fixedly connected to the outer side of the center frame, and a reciprocating curved guide groove is opened on the lower surface of the guide plate, and the ball rolls along the guide groove.

[0019] By adopting the above technical solution, when the sliding seat drives the movable seat to move, the ball on the movable seat rolls along the guide groove, thereby driving the movable seat to rotate back and forth, so that the cleaning brush can automatically clean the guide rod and further improve the uniformity of lubricating oil sprayed by the spray hole.

[0020] Preferably, a first elastic bag is fixedly connected between the first connecting rod and the frame, and a second elastic bag is fixedly connected between the second connecting rod and the fourth connecting rod, and a suction tube is connected between the first elastic bag and the second elastic bag and the water tank, and at the same time, a spray tube with an opening toward the wheel is connected to the outer side of the first elastic bag and the second elastic bag, and a one-way valve structure is provided on the suction tube and the spray tube.

[0021] By adopting the above technical solution, when the frame is adjusted, the first elastic bag or the second elastic bag will be squeezed, so that the water sucked inside can be sprayed toward the wheel, thereby reducing the friction force of the wheel during lateral adjustment, thereby alleviating the wear of the wheel.

[0022] Compared with the prior art, the invention has the following beneficial effects: the lifting trailer with adjustable wheelbase can conveniently adjust the wheelbase, and the adjustment mechanism can be automatically cleaned and lubricated during the adjustment process, and the lateral wear of the tire can be reduced. The specific contents are as follows; 1. A guide rod, a frame and a hydraulic rod are provided. The hydraulic rod is controlled to be telescopically adjusted, so that the hydraulic rod can drive the third connecting rod to rotate, thereby driving the connecting rod, the second connecting rod and the fourth connecting rod to rotate, thereby adjusting the distance between the two sets of frames, and conveniently realizing the regulation of the trailer wheel width; 2. A slide seat, a movable seat, a cam and a piston cylinder are provided. As the slide seat slides, the pull rope can pull the cam to rotate, so that the cam can push the rotating rod at different positions by adjusting the rotation direction, so that the piston cylinder in the movement direction of the slide seat can automatically spray the oil; Furthermore, as the sliding seat drives the movable seat to rotate, the movable seat can be made to reciprocate under the action of the guide groove on the guide plate. At this time, the movable seat can use a cleaning brush to automatically clean the outside of the guide rod. At the same time, the rotation of the movable seat can further increase the spraying rate of the oil on the outside of the guide rod, effectively reducing the wear of the adjusting mechanism.

[0023] 3. A first elastic bag and a second elastic bag are provided. As the distance between the two frames is adjusted, the first connecting rod and the frame will squeeze or stretch the first elastic bag, while the second connecting rod and the fourth connecting rod can squeeze or stretch the second elastic bag, so that the first elastic bag and the second elastic bag can draw water from the water tank through the suction tube and spray it to the wheel through the spray tube, thereby reducing the friction between the wheel and the ground, and further reducing the wear of the wheel during lateral movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a bottom view structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the connecting structure of the guide rod and the slide seat of the present invention; Figure 4 This is a bottom view of the structure of the guide plate of the present invention; Figure 5 This is a schematic diagram of the installation structure of the movable seat of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the slide seat and the movable seat of the present invention; Figure 7 For the present invention Figure 6 The enlarged structural diagram at A in the middle; Figure 8 It is a schematic diagram of the three-dimensional structure of the movable seat of the present invention; Fig. 9This is a schematic diagram of the cam and piston cylinder installation structure of the present invention; Fig.10 It is a schematic diagram of the connection structure of the water tank, the first elastic bag and the second elastic bag of the present invention; Fig.11 It is a schematic diagram of the connection structure of the pull rod and the rotating rod of the present invention.

[0025] In the figure: 1. traction seat; 2. guide rod; 3. center frame; 4. first connecting rod; 5. second connecting rod; 6. frame; 601, wheel; 7. third connecting rod; 8. hydraulic rod; 9. slide seat; 10. fourth connecting rod; 11. movable seat; 12. cleaning brush; 13. spray hole; 14. oil tank; 15. cam; 16. pull rope; 17. piston cylinder; 18. piston plate; 19. pull rod; 20. rotating rod; 21. oil suction pipe; 22. oil delivery pipe; 23. ball; 24. guide plate; 25. guide groove; 26. water tank; 27. first elastic bag; 28. second elastic bag; 29. ​​suction pipe; 30. spray pipe. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1: Please refer to Figure 1-Figure 3 As shown, the frame structure of the existing lifting trailer is fixed, and the wheelbase cannot be adjusted conveniently and stably. In order to solve this technical problem, this embodiment discloses the following technical contents; A lifting trailer with adjustable wheelbase comprises a traction seat 1 connected to a tractor, a guide rod 2 is fixedly installed on the rear side of the traction seat 1, a center frame 3 is fixedly installed on the rear end of the guide rod 2, and a vehicle frame 6 is movably connected to both sides of the center frame 3, and a wheel 601 is rotatably connected to the outer side of the center frame 3; It also includes: a connecting assembly connected between the center frame 3 and the frame 6 and between the traction seat 1 and the frame 6; a slide 9 slidably mounted on the outer side of the guide rod 2, and a fourth connecting rod 10 is rotatably connected between the slide 9 and the frame 6; The connecting assembly includes a first connecting rod 4 and a second connecting rod 5 which are rotatably connected between the center frame 3 and the frame 6, and the first connecting rod 4 and the second connecting rod 5 are arranged in parallel. A third connecting rod 7 is rotatably connected between the front end of the frame 6 and the traction seat 1, and a hydraulic rod 8 is rotatably connected between the third connecting rod 7 and the traction seat 1. The hydraulic rod 8 drives the third connecting rod 7 to rotate during the telescopic adjustment process.

[0028] The slide seat 9 is slidably sleeved on the outer side of the guide rod 2 , and a fourth connecting rod 10 is hinged between the slide seat 9 and the frame 6 .

[0029] By adopting the above technical solution, when the wheelbase needs to be adjusted, the hydraulic rod 8 is controlled to be telescopically adjusted, so that the hydraulic rod 8 drives the third connecting rod 7 to rotate, and then the two frames 6 are pushed to adjust the lateral position. At this time, the first connecting rod 4, the second connecting rod 5 and the fourth connecting rod 10 are rotated and adjusted, and at the same time, the fourth connecting rod 10 will drive the slide 9 to slide along the guide rod 2, thereby improving the connection strength between the two frames 6 during the wheelbase adjustment process, so that the trailer can be carried normally.

[0030] Embodiment 2: The technical content disclosed in this embodiment is a further improvement on the above embodiment 1. In the process of wheelbase adjustment of existing trailers, it is inconvenient to automatically clean and lubricate the adjustment mechanism. In order to further solve this technical problem, this embodiment discloses the following technical content, such as Figure 3-Figure 9 and Fig.11 As shown; A lubrication assembly is arranged on the slide 9, and the outer side of the guide rod 2 is automatically cleaned and lubricated by the movement of the slide 9; The lubrication assembly includes an oil tank 14 fixedly installed below the slide seat 9, and the oil tank 14 is arranged in a concave shape, and a cam 15 is elastically rotatably connected to the inner side of the oil tank 14, and a pull rope 16 is wound around the outer side of the shaft of the cam 15, and the end of the pull rope 16 close to the traction seat 1 is fixedly connected to the outer side of the third connecting rod 7.

[0031] The lubrication assembly also includes two piston cylinders 17 symmetrically fixedly mounted on the oil tank 14, and a pull rod 19 is telescopically connected to the inner side of the piston cylinder 17, and the end of the pull rod 19 close to the cam 15 is elastically rotatably connected to a rotating rod 20, and at the same time, the rotating rods 20 connected to the ends of the two pull rods 19 have opposite rotation directions, and the cam 15 pushes the two rotating rods 20 to slide and rotate respectively during the forward and reverse rotation.

[0032] One end of the pull rod 19 located on the inner side of the piston cylinder 17 is fixedly connected to the piston plate 18, and the piston plate 18 is connected to the inner side of the piston cylinder 17 by interference sliding. A spring is connected between the piston plate 18 and the piston cylinder 17, and an oil suction pipe 21 is connected between the piston cylinder 17 and the oil tank 14. At the same time, an oil delivery pipe 22 is also connected to the outer side of the piston cylinder 17, and a one-way valve structure is provided on the oil suction pipe 21 and the oil delivery pipe 22.

[0033] The lubrication assembly also includes a movable seat 11 symmetrically rotatably mounted at both ends of the slide seat 9, and a cavity is opened on the inner side of the movable seat 11, and the cavity inside the movable seat 11 is connected to the oil pipeline 22. At the same time, the movable seat 11 and the guide rod 2 are coaxially arranged, and the inner wall of the movable seat 11 is evenly opened with spray holes 13 connected to its inner cavity.

[0034] The inner wall of the movable seat 11 is also evenly fixedly connected with a cleaning brush 12, and the cleaning brush 12 is attached to the outer wall of the guide rod 2, and the outer side of the movable seat 11 is embedded with a ball 23, and the outer side of the center frame 3 is fixedly connected with a guide plate 24 parallel to the guide rod 2, and the lower surface of the guide plate 24 is provided with a reciprocating curved guide groove 25, and the ball 23 rolls along the guide groove 25.

[0035] Through the above technical solution, as the slide 9 slides on the outside of the guide rod 2 and moves away from the traction seat 1, the pull rope 16 will pull the cam 15 to rotate. At this time, the cam 15 will resist the rotating rod 20 that pushes the slide 9 in the movement direction during rotation, so that the rotating rod 20 pushes the pull rod 19 and the piston cylinder 17 to perform telescopic adjustment, so that the piston piece 18 inside the piston cylinder 17 slides elastically, and the rotating rod 20 on the other side rotates elastically under the resistance of the cam 15. When the piston piece 18 slides elastically inside the piston cylinder 17, the piston cylinder 17 can extract the oil tank through the oil suction pipe 21 The lubricating oil in 14 is transported to the cavity of the movable seat 11 through the oil pipe 22. At this time, the oil can be sprayed to the outside of the guide rod 2 through the spray hole 13. When the slide seat 9 drives the movable seat 11 to move, the ball 23 arranged on the movable seat 11 will slide along the guide groove 25 on the guide plate 24, thereby driving the movable seat 11 to reciprocate. At this time, the movable seat 11 can automatically clean the outer wall of the guide rod 2 through the cleaning brush 12, and the rotating movable seat 11 can effectively improve the uniformity of the oil spraying, avoid excessive wear of the adjusting mechanism and reduce the service life of the trailer.

[0036] Embodiment 3: The technical content disclosed in this embodiment is a further improvement on the above-mentioned embodiment 2. In the process of adjusting the wheelbase of the existing lifting trailer, it is inconvenient to reduce the lateral friction of the tire, which makes the tire wear rate larger. In order to further solve this technical problem, this embodiment discloses the following technical content, such as Figure 1-Figure 2 and Fig.10 As shown; The water tank 26 is fixedly mounted on the lower surface of the frame 6, a first elastic bag 27 is fixedly connected between the first connecting rod 4 and the frame 6, and a second elastic bag 28 is fixedly connected between the second connecting rod 5 and the fourth connecting rod 10, and a suction tube 29 is connected between the first elastic bag 27 and the second elastic bag 28 and the water tank 26, and at the same time, a spray pipe 30 with an opening toward the wheel 601 is connected to the outer side of the first elastic bag 27 and the second elastic bag 28, and a one-way valve structure is provided on the suction pipe 29 and the spray pipe 30.

[0037] By adopting the above technical solution, when the wheelbase is controlled to be reduced, the first connecting rod 4 can cooperate with the frame 6 to squeeze the first elastic bag 27, so that the first elastic bag 27 can spray the water sucked inside evenly to the outside of the wheel 601 and the ground through the suction tube 29 on its outside, thereby reducing the friction between the wheel 601 and the ground, and avoiding large wear of the wheel 601 during the lateral movement. At the same time, the second connecting rod 5 and the fourth connecting rod 10 can stretch the second elastic bag 28. At this time, the second elastic bag 28 can extract water from the water tank 26 through the suction tube 29. When the wheelbase adjustment is increased, the first elastic bag 27 will be stretched, and the second elastic bag 28 will be squeezed and sprayed with water, thereby effectively reducing the lateral wear of the wheel 601 during the wheelbase adjustment process.

[0038] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0039] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lifting trailer with adjustable wheelbase, comprising a traction seat (1) connected to a tractor, a guide rod (2) being fixedly mounted on the rear side of the traction seat (1), a center frame (3) being fixedly mounted on the rear end of the guide rod (2), and a vehicle frame (6) being movably connected to both sides of the center frame (3), and a wheel (601) being rotatably connected to the outer side thereof; It is characterized in that Also includes: A connecting assembly connected between the center frame (3) and the vehicle frame (6) and between the fifth wheel (1) and the vehicle frame (6); A sliding seat (9) is slidably mounted on the outer side of the guide rod (2), and a fourth connecting rod (10) is rotatably connected between the sliding seat (9) and the frame (6); A lubrication assembly is arranged on the slide seat (9) and realizes automatic cleaning and lubrication of the outer side of the guide rod (2) through the movement of the slide seat (9); The water tank (26) is fixedly mounted on the lower surface of the vehicle frame (6).

2. The lifting trailer with adjustable wheelbase according to claim 1, characterized in that: The connecting assembly comprises a first connecting rod (4) and a second connecting rod (5) which are rotatably connected between the center frame (3) and the vehicle frame (6), and the first connecting rod (4) and the second connecting rod (5) are arranged in parallel, and a third connecting rod (7) is rotatably connected between the front end of the vehicle frame (6) and the traction seat (1), and a hydraulic rod (8) is rotatably connected between the third connecting rod (7) and the traction seat (1), and the hydraulic rod (8) drives the third connecting rod (7) to rotate during the telescopic adjustment process.

3. The lifting trailer with adjustable wheelbase according to claim 1, characterized in that: The sliding seat (9) is slidably sleeved on the outside of the guide rod (2), and a fourth connecting rod (10) is hingedly connected between the sliding seat (9) and the vehicle frame (6).

4. The lifting trailer with adjustable wheelbase according to claim 1, characterized in that: The lubrication assembly comprises an oil tank (14) fixedly mounted below the slide seat (9), the oil tank (14) being arranged in a concave-shaped structure, a cam (15) being elastically rotatably connected to the inner side of the oil tank (14), a pull rope (16) being wound around the outer side of the shaft of the cam (15), and an end of the pull rope (16) close to the traction seat (1) being fixedly connected to the outer side of the third connecting rod (7).

5. The lifting trailer with adjustable wheelbase according to claim 4, characterized in that: The lubrication assembly further comprises two piston cylinders (17) symmetrically fixedly mounted on the oil tank (14), wherein the inner side of the piston cylinder (17) is telescopically connected to a pull rod (19), and one end of the pull rod (19) close to the cam (15) is elastically rotatably connected to a rotating rod (20), and the rotating rods (20) connected to the ends of the two pull rods (19) rotate in opposite directions, and the cam (15) pushes the two rotating rods (20) to slide and rotate respectively during forward and reverse rotation.

6. The lifting trailer with adjustable wheelbase according to claim 5, characterized in that: One end of the pull rod (19) located inside the piston cylinder (17) is fixedly connected to a piston plate (18), and the piston plate (18) is slidably connected to the inside of the piston cylinder (17) by interference fit, a spring is connected between the piston plate (18) and the piston cylinder (17), an oil suction pipe (21) is connected between the piston cylinder (17) and the oil tank (14), and an oil delivery pipe (22) is also connected to the outside of the piston cylinder (17), and both the oil suction pipe (21) and the oil delivery pipe (22) are provided with a one-way valve structure.

7. The lifting trailer with adjustable wheelbase according to claim 6, characterized in that: The lubrication assembly further comprises a movable seat (11) symmetrically rotatably mounted at both ends of the slide seat (9), wherein a cavity is provided on the inner side of the movable seat (11), and the cavity on the inner side of the movable seat (11) is connected to the oil delivery pipe (22), and the movable seat (11) and the guide rod (2) are coaxially arranged, and the inner wall of the movable seat (11) is evenly provided with spray holes (13) connected to the inner cavity thereof.

8. The lifting trailer with adjustable wheelbase according to claim 7, characterized in that: The inner wall of the movable seat (11) is evenly and fixedly connected with a cleaning brush (12), and the cleaning brush (12) is attached to the outer wall of the guide rod (2), and a ball (23) is embedded and installed on the outer side of the movable seat (11), and a guide plate (24) parallel to the guide rod (2) is fixedly connected to the outer side of the center frame (3), and a reciprocating curved guide groove (25) is formed on the lower surface of the guide plate (24), and the ball (23) rolls along the guide groove (25).

9. The lifting trailer with adjustable wheelbase according to claim 2, characterized in that: A first elastic bag (27) is fixedly connected between the first connecting rod (4) and the frame (6), and a second elastic bag (28) is fixedly connected between the second connecting rod (5) and the fourth connecting rod (10), and a liquid suction pipe (29) is connected between the first elastic bag (27) and the second elastic bag (28) and the water tank (26), and a liquid spray pipe (30) with an opening facing the wheel (601) is connected to the outer side of the first elastic bag (27) and the second elastic bag (28), and a one-way valve structure is provided on the liquid suction pipe (29) and the liquid spray pipe (30).

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