Multi-posture adjustable chassis and transport vehicle

Abstract

The multi-posture adjustable chassis comprises a chassis frame, rotating supporting legs and lifting supporting legs, the chassis frame is provided with a main frame body and first connecting frames arranged on the front side and the rear side of the main frame body, the four rotating supporting legs are arranged on the front side and the rear side of the main frame body in pairs, and each rotating supporting leg comprises an adjusting assembly and a rotating supporting leg wheel type assembly; the adjusting assembly can drive the wheel assembly to swing so as to change the ground clearance, the at least four lifting supporting legs are arranged in the middle of the main frame body in pairs, each lifting supporting leg comprises a lifting assembly and a lifting supporting leg wheel assembly, the lifting assemblies can drive the lifting supporting legs to ascend and descend so as to change the ground clearance, and driving assemblies are arranged in the wheel assemblies so as to drive the chassis to move. Through the synergistic effect of swinging of the rotating supporting legs and stretching and retracting of the lifting supporting legs, the posture and the ground clearance of the chassis can be dynamically adjusted, the chassis effectively adapts to complex terrains such as steps, ramps and gullies, and the trafficability, stability and operation flexibility of a vehicle in an unstructured environment are improved.

Description

Technical Field

[0001] This invention belongs to the field of chassis technology, specifically relating to a multi-position adjustable chassis and a transport vehicle. Background Technology

[0002] When carrying out engineering construction or transporting materials in complex terrains such as mountainous areas, mining areas, and forest areas, small transport vehicles are often used to transfer materials, tools, and equipment. Because the terrain in these scenarios is uneven and there are obstacles such as slopes, steps, and ditches, the transport vehicles need to have good passability and stability.

[0003] Existing transport vehicles typically use fixed chassis and ordinary wheeled running gear, with fixed ground clearance and support points. When the vehicle encounters a slope or steps, the chassis is prone to bottoming out or insufficient wheel traction, making it difficult to climb. When the vehicle encounters ditches or potholes, the front and rear wheel sets may become suspended in the air or lack sufficient support points, resulting in unstable vehicle posture or even overturning, affecting the safety and efficiency of transport operations. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-position adjustable chassis and a transport vehicle to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-position adjustable chassis and a transport vehicle, including a chassis frame, including a main frame and a first connecting frame, wherein the first connecting frame is disposed on the front and rear sides of the main frame; There are four rotating outriggers, which are respectively set on the front and rear sides of the main frame and are arranged symmetrically in pairs along the width direction of the main frame. Each rotating outrigger includes an adjustment component and a rotating outrigger wheel assembly. The adjustment component is connected to the rotating outrigger wheel assembly and is used to drive the rotating outrigger wheel assembly to swing relative to the main frame, thereby adjusting the relative height between the rotating outrigger wheel assembly and the main frame to change the ground clearance of the main frame. At least four lifting outriggers are located in the middle of the main frame and are arranged symmetrically in pairs along the width of the main frame. Each lifting outrigger includes a lifting assembly and a lifting outrigger wheel assembly. The lifting assembly is connected to the lifting outrigger wheel assembly and drives it to lift and lower, thereby changing the ground clearance of the main frame. Both the rotating outrigger wheel assembly and the lifting outrigger wheel assembly include a drive assembly for driving the chassis frame to move when the outriggers support the ground. Furthermore, the adjustment assembly includes a bracket, an adjustment drive component, and a connecting frame; the bracket is fixedly connected to the first connecting frame and the main frame body respectively; one end of the adjustment drive component is hinged to the bracket, and the other end is hinged to the connecting frame, so as to drive the connecting frame to drive the rotating support leg wheel assembly to swing relative to the main frame body.

[0006] Furthermore, the adjusting drive component is an adjusting cylinder, and the adjusting assembly further includes a first adjusting cylinder connecting seat, a first connecting rod connecting seat, a connecting rod, a second adjusting cylinder connecting seat, a first steering connecting seat, and a second connecting rod connecting seat; the first adjusting cylinder connecting seat is disposed in the upper region of the bracket, and the first connecting rod connecting seat is disposed in the lower region of the bracket; one end of the adjusting cylinder is rotatably connected to the first adjusting cylinder connecting seat, and the other end is rotatably connected to the second adjusting cylinder connecting seat disposed on the connecting frame; one end of the connecting rod is rotatably connected to the upper end of the first connecting rod connecting seat, and the other end is rotatably connected to the second connecting rod connecting seat; one end of the connecting frame is rotatably connected to the lower end of the first connecting rod connecting seat, and the other end is coaxially hinged to the second connecting rod connecting seat and the first steering connecting seat.

[0007] Furthermore, the adjustment assembly also includes a damping spring and a second steering connection seat, the damping spring being disposed between the second link connection seat and the second steering connection seat.

[0008] Furthermore, the rotating outrigger wheel assembly includes a steering assembly and a traveling assembly, wherein the traveling assembly is rotatably connected to the steering assembly; The adjustment component drives the connecting frame to rotate via the adjustment cylinder, thereby causing the rotating outrigger wheel assembly to swing relative to the main frame, thus changing the ground clearance of the main frame. The steering component is used to drive the walking component to deflect around the steering axis to achieve steering.

[0009] Furthermore, the steering assembly includes a sleeve, a wheel-type connecting seat, a first steering cylinder connecting seat, a steering cylinder, and a second steering cylinder connecting seat; one side of the wheel-type connecting seat is fixedly connected to the walking assembly, and the other side is rotatably connected to the sleeve; the first steering cylinder connecting seat is fixed to the wheel-type connecting seat, and the second steering cylinder connecting seat is fixed to the sleeve; both ends of the steering cylinder are rotatably connected to the first steering cylinder connecting seat and the second steering cylinder connecting seat, respectively; both the first steering connecting seat and the second steering connecting seat are fixed to the sleeve.

[0010] Furthermore, the lifting outrigger also includes a fixing plate, and the lifting assembly is fixedly connected to the fixing plate and to the main frame through it.

[0011] Furthermore, the lifting assembly includes a fixed square tube and a movable square tube, the movable square tube being slidably disposed within the fixed square tube; the fixed square tube has a first limiting hole at its upper part, and the movable square tube has a second limiting hole at its lower part; it also includes a lifting cylinder, a first lifting cylinder connecting seat, and a second lifting cylinder connecting seat, the two ends of the lifting cylinder being hinged to the first lifting cylinder connecting seat and the second lifting cylinder connecting seat respectively via pins, the first lifting cylinder connecting seat being connected to the first limiting hole via a pin, and the second lifting cylinder connecting seat being connected to the second limiting hole via a pin, so that when the lifting cylinder extends or retracts, it drives the movable square tube to slide relative to the fixed square tube; the movable square tube is fixedly connected to the lifting outrigger wheel assembly.

[0012] Furthermore, a transport vehicle is also provided, including the multi-position adjustable chassis of the above embodiments; it also includes a power module disposed in the middle of the main frame to provide power support for the vehicle; and a cargo bin disposed on one side of the main frame for loading short materials.

[0013] Furthermore, it also includes a second connecting frame, which is disposed between the fixed square tubes for carrying long materials. The top surface of the fixed square tubes is higher than the bearing surface of the second connecting frame to limit the long material.

[0014] The technical effects and advantages of this invention are as follows: By adjusting the rotation of the outriggers and the telescopic characteristics of the lifting outriggers, the chassis can form multi-point support and coordinate the adjustment of ground clearance when crossing obstacles such as steps, slopes and ditches, thereby improving the vehicle's passability and stability; when not crossing obstacles, the outriggers can be retracted to a position close to the chassis frame, reducing the overall vehicle dimensions and improving vehicle maneuverability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention; Figure 2 This is a schematic diagram of the chassis structure of the present invention; Figure 3 This is a schematic diagram of the rotating support leg structure of the present invention; Figure 4 This is a schematic diagram of the adjustment component structure of the present invention; Figure 5 This is a schematic diagram of the rotating outrigger wheel assembly structure of the present invention; Figure 6 For the present invention Figure 5 Another perspective structural diagram; Figure 7 This is an exploded view of the steering component of the present invention; Figure 8 This is a schematic diagram of the lifting outrigger structure of the present invention; Figure 9This is a schematic diagram of the explosion of the lifting outrigger of the present invention; Figure 10 This is a schematic diagram of the transport vehicle of the present invention going uphill / downhill; Figure 11 This is a schematic diagram of the transport vehicle of the present invention making a U-turn in place; Figure 12 This is a schematic diagram of the transport vehicle of the present invention climbing a slope; Figure 13 This is a schematic diagram of the transport vehicle of the present invention crossing a ditch.

[0016] In the diagram: 10 chassis frame, 110 main frame, 120 first connecting frame, 130 second connecting frame; 20. Rotate the outriggers; 210 Adjustment assembly, 2101 Bracket, 2102 First adjusting cylinder connecting seat, 2103 First connecting rod connecting seat, 2104 Adjusting cylinder, 2105 Connecting rod, 2106 Connecting frame, 2107 Second adjusting cylinder connecting seat, 2108 First steering connecting seat, 2109 Second steering connecting seat, 2110 Second connecting rod connecting seat, 2111 Shock absorber spring; 220 Rotary outrigger wheel assembly, 2201 Sleeve, 2202 Wheel connecting seat, 2203 First steering cylinder connecting seat, 2204 Steering cylinder, 2205 Second steering cylinder connecting seat, 2206 Traveling assembly; 30 lifting outriggers; 310 Lifting assembly, 3101 Fixed square tube, 3102 First limiting hole, 3103 Moving square tube, 3104 Second limiting hole, 3105 Lifting cylinder, 3106 First lifting cylinder connecting seat, 3107 Second lifting cylinder connecting seat. 320 lifting outrigger wheel assembly; 330 fixing plate; 40 bucket; 50 power module; 60 cargo bucket; 70 long material. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: like Figure 2 The multi-attitude adjustable chassis shown includes a chassis frame 10, including a main frame 110 and a first connecting frame 120, the first connecting frame 120 being disposed on the front and rear sides of the main frame 110. There are four rotating outriggers 20, which are respectively set on the front and rear sides of the main frame 110 and are arranged symmetrically in pairs along the width direction of the main frame 110. Each rotating outrigger 20 includes an adjustment component 210 and a rotating outrigger wheel assembly 220. The adjustment component 210 is connected to the rotating outrigger wheel assembly 220 and is used to drive the rotating outrigger wheel assembly 220 to swing relative to the main frame 110, thereby adjusting the relative height between the rotating outrigger wheel assembly 220 and the main frame 110 to change the ground clearance of the main frame 110. At least four lifting outriggers 30 are located in the middle of the main frame 110 and are arranged symmetrically in pairs along the width direction of the main frame 110. Each lifting outrigger 30 includes a lifting assembly 310 and a lifting outrigger wheel assembly 320. The lifting assembly 310 is connected to the lifting outrigger wheel assembly 320 and drives it to rise and fall to change the ground clearance of the main frame 110. Both the rotating outrigger wheel assembly 220 and the lifting outrigger wheel assembly 320 include a drive assembly for driving the chassis frame 10 to move when the outrigger supports the ground.

[0019] The number of lifting outriggers 30 can be set according to actual requirements, such as 4, 6, 8, etc. They must be distributed along the length of the main frame 110 and arranged in pairs symmetrically along the width. When not in use, the rotating outriggers 20 are in a retracted state. When in use, they need to be used in conjunction with the lifting outriggers 30, that is, the lifting outriggers 30 extend and retract to adjust the ground clearance of the main frame 110. Then, the rotating outriggers 20 rotate at a certain angle so that the rotating outrigger wheel assembly 220 on them is grounded and supported.

[0020] like Figures 3-7As shown, in this embodiment, the adjustment assembly 210 includes a bracket 2101, a first adjusting cylinder connecting seat 2102, a first connecting rod connecting seat 2103, an adjusting cylinder 2104, a connecting rod 2105, and a connecting frame 2106. The bracket 2101 is fixedly connected to the first connecting frame 120 and the main frame 110. The first adjusting cylinder connecting seat 2102 is disposed in the upper region of the bracket 2101, and the first connecting rod connecting seat 2103 is disposed in the lower region of the bracket 2101. One end of the adjusting cylinder 2104 is rotatably connected to the first adjusting cylinder connecting seat 2102, and the other end is rotatably connected to the second adjusting cylinder connecting seat 2107 disposed on the connecting frame 2106. One end of the connecting rod 2105 is rotatably connected to the upper end of the first connecting rod connecting seat 2103, and the other end is rotatably connected to the second connecting rod connecting seat 2107 disposed on the connecting frame 2106. One end of the connecting frame 2106 is rotatably connected to the lower end of the first connecting rod connecting seat 2103, and the other end is rotatably connected to the second connecting rod connecting seat 2106. The rod connecting seat 2110 is coaxially hinged to the first steering connecting seat 2108. The rotating outrigger wheel assembly 220 includes a steering component and a traveling component 2206, which is rotatably connected to the steering component. The steering component includes a sleeve 2201, a wheel connecting seat 2202, a first steering cylinder connecting seat 2203, a steering cylinder 2204, and a second steering cylinder connecting seat 2205. One side of the wheel connecting seat 2202 is fixedly connected to the traveling component 2206, and the other side is rotatably connected to the sleeve 2201. The first steering cylinder connecting seat 2203 is fixed to the wheel connecting seat 2202, and the second steering cylinder connecting seat 2205 is fixed to the sleeve 2201. Both ends of the steering cylinder 2204 are rotatably connected to the first steering cylinder connecting seat 2203 and the second steering cylinder connecting seat 2205, respectively. The first steering connecting seat 2108 and the second steering connecting seat 2109 are both fixed to the sleeve 2201.

[0021] When the outrigger 20 needs adjustment, the extension and retraction of the adjusting cylinder 2104 drives the connecting frame 2106 to rotate around the first connecting rod connecting seat 2103, thereby driving the connecting seat 2108 fixed thereto to rotate. The connecting seat 2108 drives the sleeve 2201 to rotate, thereby causing the outrigger wheel assembly 220 to swing relative to the main frame 110. The connecting rod 2105 plays a key attitude guidance role. When turning is required, the extension and retraction of the steering cylinder 2204 acts on the first steering cylinder connecting seat 2203, thereby causing the wheel connecting seat 2202 to rotate relative to the sleeve 2201, achieving the purpose of turning.

[0022] like Figure 4As shown, in this embodiment, the adjustment component 210 further includes a shock-absorbing spring 2111 and a second steering connection seat 2109. The shock-absorbing spring 2111 is disposed between the second link connection seat 2110 and the second steering connection seat 2109. The shock-absorbing spring 2111 can provide a certain shock-absorbing effect when the vehicle is using the rotating outrigger 20 to walk.

[0023] like Figure 8 and Figure 9 As shown, in this embodiment, the lifting outrigger 30 also includes a fixing plate 330. The lifting assembly 310 is fixedly connected to the fixing plate 330 and to the main frame 110 through it. The lifting assembly 310 includes a fixed square tube 3101 and a movable square tube 3103, with the movable square tube 3103 slidably disposed within the fixed square tube 3101. The fixed square tube 3101 has a first limiting hole 3102 at its upper part, and the movable square tube 3103 has a second limiting hole 3104 at its lower part. It also includes a lifting cylinder 3105, a first lifting cylinder connecting seat 3106, and a second lifting cylinder connecting seat 3107. The two ends of the lifting cylinder 3105 are respectively hinged to the first lifting cylinder connecting seat 3106 and the second lifting cylinder connecting seat 3107 via pins. The first lifting cylinder connecting seat 3106 is connected to the first limiting hole 3102 via pins, and the second lifting cylinder connecting seat 3107 is connected to the second limiting hole 3104 via pins, so that when the lifting cylinder 3105 extends or retracts, it drives the movable square tube 3103 to slide relative to the fixed square tube 3101. The movable square tube 3103 is fixedly connected to the lifting outrigger wheel assembly 320.

[0024] When lifting is required, the lifting cylinder 3105 is driven to extend and retract. Its upper end is fixed to the fixed square tube 3101 through the first lifting cylinder connecting seat 3106, and its lower end is fixed to the movable square tube 3103 through the second lifting cylinder connecting seat 3107. This allows the movable square tube 3103 to slide within the fixed square tube 3101, thereby driving the lifting outrigger wheel assembly 320 to move up and down.

[0025] like Figure 12 As shown, when climbing a slope, the lifting outriggers 30 first lift the entire chassis, and the adjusting cylinders 2104 of the front and rear rotating outriggers 20 retract to raise the outriggers to the highest position. The lifting outrigger wheel assembly 320 moves to the vicinity of the step via the drive assembly (wheel hub motor drives the wheels to move). At this time, the front rotating outrigger 20 is adjusted to press it onto the step surface, and the rear rotating outrigger 20 is also pressed onto the ground. The middle outrigger retracts, and the rotating outrigger wheel assembly 220 of the front and rear rotating outriggers moves forward in coordination. When the rear outrigger is suspended in the air, the height can be adjusted in time via the middle lifting outrigger 30 so that the chassis can smoothly transition onto the step.

[0026] like Figure 13As shown, when crossing a ditch, the adjusting cylinders 2104 of the front and rear rotating outriggers 20 retract first, mainly to facilitate the lifting of the front and rear rotating outriggers 20 off the ground. They are supported by the lifting outriggers 30 and move forward. When the front rotating outrigger 20 crosses the ditch and approaches the opposite ground, the rear rotating outrigger 20 is pressed onto the ground, so that the lifting outrigger wheel assembly 320 of the lifting outrigger 30 is lifted off the ground. It moves forward by relying on the rotating outrigger wheel assembly 220 of the front and rear rotating outriggers 20 (wheel hub motor drives the wheels to move). When the rear outrigger approaches the ditch, the middle lifting outrigger 30 extends to support the chassis to move forward until the rear rotating outrigger 20 completely crosses the ditch.

[0027] Example 2 like Figure 1 As shown, in this embodiment, a transport vehicle is applied to the multi-position adjustable chassis of the above embodiment; a power module is set in the middle of the main frame 110 to provide power support for the vehicle; a cargo bucket is set on one side of the main frame 110 for loading short materials, and also includes a digging bucket 40, which is set on the other side of the main frame 110.

[0028] The power module provides the vehicle with the necessary hydraulic power and electrical support, while the bucket 40 enhances the vehicle's versatility.

[0029] like Figure 1 As shown, in this embodiment, a second connecting frame 130 is also included, which is disposed between the fixed square tubes 3101 for carrying the long material 70. The fixed square tubes 3101 are higher than the second connecting frame 130 to limit the long material 70.

[0030] The long material 70 is placed on the second connecting frame 130. Since the fixed square tube 3101 is higher than the second connecting frame 130, it can act as a baffle to prevent the long material 70 from sliding out in the width direction of the transport vehicle.

[0031] Example 3 The difference from the above embodiments lies in the application on slopes. like Figure 10 As shown, when going up or down a slope, the lifting outrigger 30 lifts the chassis, and the front and rear rotating outriggers 20 rotate to different angles. Then the lifting outrigger 30 retracts, so that the rotating outrigger wheel assembly 220 of the front and rear rotating outriggers 20 is grounded, so that when using the front and rear rotating outriggers 20 to go up a slope, the chassis remains as parallel to the horizontal plane as possible, ensuring the stability of the vehicle during transportation.

[0032] Example 4 like Figure 11As shown, the vehicle also features a U-turn capability. When a very small radius turn is required, the lifting outriggers 30 are retracted, causing the lifting outrigger wheel assembly 320 to lift off the ground, with the entire vehicle supported only by the front and rear rotating outriggers 20. The control system drives the steering cylinders 2204 on each rotating outrigger to work in tandem, causing the wheel axes of the four rotating outrigger wheel assemblies 220 to converge at the chassis center (or the tangential directions of the wheels to be on the same circumference). Subsequently, the left and right rotating outrigger wheel assemblies 220 are controlled to travel in opposite directions, thereby achieving a 360-degree rotation around the geometric center of the vehicle body, improving maneuverability in confined spaces.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-position adjustable chassis, characterized in that, include: The chassis frame (10) includes a main frame (110) and a first connecting frame (120), the first connecting frame (120) being disposed on the front and rear sides of the main frame (110); There are four rotating outriggers (20), which are respectively set on the front and rear sides of the main frame (110) and are arranged symmetrically in pairs along the width direction of the main frame (110). Each rotating outrigger (20) includes an adjustment component (210) and a rotating outrigger wheel assembly (220). The adjustment component (210) is connected to the rotating outrigger wheel assembly (220) and is used to drive the rotating outrigger wheel assembly (220) to swing relative to the main frame (110), thereby adjusting the relative height between the rotating outrigger wheel assembly (220) and the main frame (110) to change the ground clearance of the main frame (110). At least four lifting outriggers (30) are arranged in pairs symmetrically in the middle of the main frame (110) and along the width direction of the main frame (110); each lifting outrigger (30) includes a lifting assembly (310) and a lifting outrigger wheel assembly (320), the lifting assembly (310) is connected to the lifting outrigger wheel assembly (320) and drives it to lift and lower, so as to change the ground clearance of the main frame (110); The rotating outrigger wheel assembly (220) and the lifting outrigger wheel assembly (320) both include a drive assembly for driving the chassis frame (10) to move when the outrigger supports the ground.

2. The multi-attitude adjustable chassis according to claim 1, characterized in that: The adjustment assembly (210) includes a bracket (2101), an adjustment drive, and a connecting frame (2106); the bracket (2101) is fixedly connected to the first connecting frame (120) and the main frame (110) respectively; one end of the adjustment drive is hinged to the bracket (2101) and the other end is hinged to the connecting frame (2106) to drive the connecting frame (2106) to drive the rotating support leg wheel assembly (220) to swing relative to the main frame (110).

3. The multi-position adjustable chassis according to claim 2, characterized in that: The adjustment drive component is an adjustment cylinder (2104), and the adjustment assembly (210) also includes a first adjustment cylinder connecting seat (2102), a first connecting rod connecting seat (2103), a connecting rod (2105), a second adjustment cylinder connecting seat (2107), a first steering connecting seat (2108), and a second connecting rod connecting seat (2110). The first adjusting cylinder connecting seat (2102) is disposed in the upper region of the bracket (2101), and the first connecting rod connecting seat (2103) is disposed in the lower region of the bracket (2101); One end of the regulating cylinder (2104) is rotatably connected to the first regulating cylinder connecting seat (2102), and the other end is rotatably connected to the second regulating cylinder connecting seat (2107) provided on the connecting frame (2106); One end of the connecting rod (2105) is rotatably connected to the upper end of the first connecting rod connecting seat (2103), and the other end is rotatably connected to the second connecting rod connecting seat (2110); One end of the connecting frame (2106) is rotatably connected to the lower end of the first connecting rod connecting seat (2103), and the other end is coaxially hinged to the first steering connecting seat (2108) with the second connecting rod connecting seat (2110).

4. The multi-attitude adjustable chassis according to claim 3, characterized in that: The adjustment assembly (210) further includes a damping spring (2111) and a second steering connector (2109), wherein the damping spring (2111) is disposed between the second connecting rod connector (2110) and the second steering connector (2109).

5. The multi-attitude adjustable chassis according to claim 3 or 4, characterized in that: The rotating outrigger wheel assembly (220) includes a steering assembly and a walking assembly (2206), wherein the walking assembly (2206) is rotatably connected to the steering assembly; The steering component is used to drive the walking component (2206) to deflect about the steering axis to achieve steering.

6. The multi-attitude adjustable chassis according to claim 5, characterized in that: The steering assembly includes a sleeve (2201), a wheel connecting seat (2202), a first steering cylinder connecting seat (2203), a steering cylinder (2204), and a second steering cylinder connecting seat (2205); One side of the wheel-type connecting seat (2202) is fixedly connected to the walking assembly (2206), and the other side is rotatably connected to the sleeve (2201); The first steering cylinder connecting seat (2203) is fixed on the wheel connecting seat (2202), and the second steering cylinder connecting seat (2205) is fixed on the sleeve (2201); The two ends of the steering cylinder (2204) are rotatably connected to the first steering cylinder connecting seat (2203) and the second steering cylinder connecting seat (2205), respectively; Both the first steering connector (2108) and the second steering connector (2109) are fixed on the sleeve (2201).

7. The multi-position adjustable chassis according to claim 1, characterized in that: The lifting outrigger (30) also includes a fixing plate (330), and the lifting assembly (310) is fixedly connected to the fixing plate (330) and to the main frame (110) through it.

8. The multi-position adjustable chassis according to claim 1, characterized in that: The lifting assembly (310) includes a fixed square tube (3101) and a movable square tube (3103), wherein the movable square tube (3103) is slidably disposed within the fixed square tube (3101); The fixed square tube (3101) is provided with a first limiting hole (3102) at the upper part, and the movable square tube (3103) is provided with a second limiting hole (3104) at the lower part. It also includes a lifting cylinder (3105), a first lifting cylinder connecting seat (3106), and a second lifting cylinder connecting seat (3107). The two ends of the lifting cylinder (3105) are respectively hinged to the first lifting cylinder connecting seat (3106) and the second lifting cylinder connecting seat (3107) through pins. The first lifting cylinder connecting seat (3106) is connected to the first limiting hole (3102) through a pin, and the second lifting cylinder connecting seat (3107) is connected to the second limiting hole (3104) through a pin, so that when the lifting cylinder (3105) extends or retracts, it drives the movable square tube (3103) to slide relative to the fixed square tube (3101). The movable square tube (3103) is fixedly connected to the lifting outrigger wheel assembly (320).

9. A transport vehicle, characterized in that, include: Multi-position adjustable chassis as described in any one of claims 1 to 8; A power module is located in the middle of the main frame (110) to provide power support for the vehicle; A cargo bin, located on one side of the main frame (110), is used for loading short materials.

10. The transport vehicle according to claim 9, characterized in that: It also includes a second connecting frame (130), which is disposed between the fixed square tubes (3101) for carrying long materials (70), the top surface of the fixed square tubes (3101) being higher than the bearing surface of the second connecting frame (130) to limit the long materials.

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