Combined frame of transport vehicle

Abstract

The invention discloses a combined frame of a transport vehicle, relates to the technical field of automobile manufacturing, and solves the technical problems of large occupied area, higher transport cost and inconvenience in assembly after disassembly of a chassis frame of a vehicle body in the prior art. According to the combined frame of the transport vehicle, the frame is of a detachable mounting structure, the frame of the detachable mounting structure comprises a front axle chassis frame, a middle connecting frame and a rear axle chassis frame from the head to the tail, and the three module frames are detachably assembled in the mode that outer square pipes and inner square pipes are connected in an inserted mode.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile manufacturing, and specifically relates to a combined frame for a transport vehicle. Background Art

[0002] At present, for various vehicles on the market, due to the large floor area of the vehicle body chassis frame, during long-distance transportation, it occupies a relatively large space, which will bring great inconvenience to long-distance sea and land transportation, and the transportation cost is relatively high. Moreover, the existing detachable chassis structure is complex, the manufacturing cost is high, and it still occupies a relatively large space after disassembly, and it cannot effectively reduce the space. Moreover, after disassembly, it is inconvenient to assemble and requires professional technicians to assemble and adjust, which cannot meet the actual use requirements.

[0003] In addition, the connection structure of the traditional frame adopts a welding connection method, and there is a problem of easy fracture due to stress concentration generated during use. Summary of the Invention

[0004] In view of the defects and deficiencies in the prior art, the present invention provides a combined frame for a transport vehicle which, after disassembly, has a small overall floor area of the device, is beneficial to long-distance transportation, significantly reduces the transportation cost, and at the same time is easy to reassemble, accurately position and install, saves time and effort, and significantly improves the installation efficiency.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: The combined frame for a transport vehicle provided by the present invention is a detachable installation structure frame. The detachable installation structure frame includes a front axle chassis frame, a middle connecting frame, and a rear axle chassis frame from the head to the tail, and the three module frames are detachably assembled by inserting an outer square tube into an inner square tube respectively.

[0006] Preferably, the middle connecting frame includes a left main beam and a right main beam. The front axle chassis frame and the rear axle chassis frame are respectively provided with a front connecting pipe sleeve and a rear connecting pipe sleeve that match the left main beam and the right main beam, and the front and rear ends of the left main beam and the right main beam can respectively pass through the front connecting pipe sleeve and the rear connecting pipe sleeve.

[0007] Preferably, both the left main beam and the right main beam of the middle connecting frame are inner square tubes. The middle connecting frame further includes a right arm frame body and a left arm frame body sleeved on the left main beam and the right main beam. The right arm frame body and the left arm frame body are horizontal support frames, and the inner support frames thereof are outer square tubes that match the inner square tube structure of the main beam. The inner square tubes of the left main beam and the right main beam respectively pass longitudinally through the inner square tubes on the left arm frame body and the right arm frame body.

[0008] Preferably, the left main beam and the right main beam are of equal length, and their length is greater than or equal to the sum of the lengths of the front connecting pipe sleeve, the rear connecting pipe sleeve, and the inner support frame.

[0009] Preferably, a front bumper is further connected to the front side of the front axle chassis frame. The front bumper is provided with a front locking mechanism detachably and fixedly connected to the front ends of the left main beam and the right main beam. The front ends of the left main beam and the right main beam pass outside the outer tube of the front connecting sleeve and are detachably and fixedly connected to the front locking mechanism. A tail bumper is connected to the rear side of the rear axle chassis frame. The tail bumper is provided with a rear locking mechanism detachably and fixedly connected to the rear ends of the left main beam and the right main beam. The rear ends of the left main beam and the right main beam pass outside the outer tube of the rear connecting sleeve and are detachably and fixedly connected to the rear locking mechanism.

[0010] Preferably, a first transverse connecting frame is further connected between the two rear connecting sleeves of the rear axle chassis frame. A second transverse connecting frame is further connected between the two front connecting sleeves of the front axle chassis frame. An intermediate longitudinal frame body is detachably connected between the first transverse connecting frame and the second transverse connecting frame. The intermediate longitudinal frame body is arranged parallel to the left main beam and the right main beam, and the three are in the same horizontal plane.

[0011] Preferably, the intermediate longitudinal frame body is also a support square tube structure, and its front and rear ends are respectively detachably connected to the first transverse connecting frame and the second transverse connecting frame through flange structures.

[0012] Preferably, a second transverse connecting frame is connected between the rear ends of the two front connecting sleeves of the front axle chassis frame. A third transverse connecting frame parallel to the second transverse connecting frame is further connected between the front ends of the two front connecting sleeves of the front axle chassis frame. A fourth longitudinal connecting support frame coinciding with the central axis of the intermediate longitudinal frame body is further connected between the second transverse connecting frame and the third transverse connecting frame. A transverse front wheel support frame is connected to the bottom of the front axle chassis frame. The middle of the transverse front wheel support frame is connected to the fourth longitudinal connecting support frame through a first suspension buckle. The two ends of the transverse front wheel support frame are respectively connected to the front wheel devices on both sides. First vertical support frames matching the installation of the front axle are symmetrically arranged on the upper surfaces of the two front connecting sleeves respectively.

[0013] Preferably, three groups of first vertical support frames are symmetrically arranged on the upper surfaces of the two front connecting sleeves respectively. The two outer groups of first vertical support frames are connected to the front wheel devices through Y-shaped connecting frames. The first vertical support frame in the middle group is connected to the outer end of the transverse front wheel support frame through a first connecting rod. A steering adjustment mechanism is further connected to the two front wheel devices.

[0014] Preferably, a set of fifth bottom crossbars matching the rear axle are also connected to the bottoms of the two rear connecting pipe sleeves. Both ends of the fifth bottom crossbars are longer than the two ends of the rear connecting pipe sleeves, and a second vertical support frame is also connected to the upper surface of the extended ends. A longitudinal rear wheel support frame is connected between the front and rear second vertical support frames, and both ends of the rear axle are connected to the longitudinal rear wheel support frame through second suspension buckles.

[0015] The present invention provides a combined frame for a transport vehicle. It has the following beneficial effects: The combined frame of the transport vehicle of the present invention has a clever device structure design. On the basis of ensuring the structural stability of the overall use, it significantly improves the load-bearing capacity and service life of the frame. It is convenient for the production, manufacture, disassembly and assembly of the entire combined frame of the transport vehicle, meeting the actual use requirements.

[0016] After assembly, precise positioning of the socket structure can be achieved, ensuring the stability of the connection structure, evenly dispersing the vehicle body weight, effectively reducing the load-bearing capacity of the left main beam 301 and the right main beam 302, and extending the service life of the device. After disassembly, the overall footprint of the device is small, which is beneficial for long-distance transportation, significantly reducing the transportation cost. At the same time, it is also easy to reassemble, accurately position and install, saving time and effort, and significantly improving the installation efficiency. Brief Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention; Figure 2 It is Figure 1 a schematic structural diagram of the three-dimensional view of Figure 3 It is Figure 1 a schematic structural diagram of the exploded view of Figure 4 It is a schematic structural diagram of the structure of the present invention after installing the axle; Figure 5 It is Figure 4 a schematic structural diagram of the three-dimensional view of

[0018] In the figure: 1. Front axle chassis frame, 2. Rear axle chassis frame, 3. Middle connecting frame, 301. Left main beam, 302. Right main beam, 303. Middle longitudinal frame body, 4. Front connecting pipe sleeve, 5. Rear connecting pipe sleeve, 6. Right arm frame body, 7. Left arm frame body, 8. Front bumper, 9. Front locking mechanism, 10. Tail bumper, 11. Rear locking mechanism, 12. First transverse connecting frame, 13. Second transverse connecting frame, 14. Third transverse connecting frame, 15. Fourth longitudinal connecting support frame, 16. Transverse front wheel support frame, 17. First suspension buckle, 18. First vertical support frame, 19. Front wheel device, 20. Y-shaped connecting frame, 21. First connecting rod, 22. Fifth bottom cross bar, 23. Second vertical support frame, 24. Longitudinal rear wheel support frame, 25. Second suspension buckle. Detailed implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] In the present invention, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Please refer to Figures 1-5 , the present invention provides a technical solution: The combined frame of the transport vehicle provided by the present invention. The combined frame of the transport vehicle provided by the present invention is a detachable installation structure frame. The detachable installation structure frame includes a front axle chassis frame 1, a middle connecting frame 3, and a rear axle chassis frame 2 from the head to the tail. And the three module frames can be detachably assembled by inserting an inner square pipe into an outer square pipe respectively. The connection structure of the inner square pipe and the outer square pipe effectively solves the problem that the stress concentration generated by the traditional welding connection structure is easy to break, and ensures the stability of the connection structure.

[0022] The middle connecting frame 3 includes a left main beam 301 and a right main beam 302. The front axle chassis frame 1 and the rear axle chassis frame 2 are respectively provided with a front connecting pipe sleeve 4 and a rear connecting pipe sleeve 5 that match the left main beam 301 and the right main beam 302. The front and rear ends of the left main beam 301 and the right main beam 302 can respectively pass through the front connecting pipe sleeve 4 and the rear connecting pipe sleeve 5.

[0023] Both the left main beam 301 and the right main beam 302 of the middle connecting frame 3 are inner square tubes. The middle connecting frame 3 further includes a right arm frame body 6 and a left arm frame body 7 sleeved on the left main beam 301 and the right main beam 302. The right arm frame body 6 and the left arm frame body 7 are horizontal support frames, and their inner support frames are outer square tubes matching the structure of the inner square tubes of the main beams. The inner square tubes of the left main beam 301 and the right main beam 302 longitudinally pass through the inner square tubes on the left arm frame body 7 and the right arm frame body 6 respectively. This kind of inner and outer square tube sleeved structure can realize the precise positioning of the sleeved structure and ensure the stability of the connection structure.

[0024] The left main beam 301 and the right main beam 302 are of equal length, and their length is greater than or equal to the sum of the lengths of the front connecting pipe sleeve 4, the rear connecting pipe sleeve 5 and the inner support frame. With this kind of structural design, the left main beam 301 and the right main beam 302 can penetrate the front connecting pipe sleeve 4, the inner support frame and the rear connecting pipe sleeve 5 from beginning to end, which is convenient for disassembly and assembly. At the same time, effective connection of the front axle chassis frame 1, the middle connecting frame 3 and the rear axle chassis frame 2 can be realized during the assembly process.

[0025] A front bumper 8 is also connected and provided on the front side of the front axle chassis frame 1. The front bumper 8 is provided with a front locking mechanism 9 detachably and fixedly connected to the front ends of the left main beam 301 and the right main beam 302. The front ends of the left main beam 301 and the right main beam 302 pass through the outer square tubes of the front connecting pipe sleeve 4 and are detachably and fixedly connected to the front locking mechanism 9; a tail bumper 10 is connected and provided on the rear side of the rear axle chassis frame 2. The tail bumper 10 is provided with a rear locking mechanism 11 detachably and fixedly connected to the rear ends of the left main beam 301 and the right main beam 302; the rear ends of the left main beam 301 and the right main beam 302 pass through the outer square tubes of the rear connecting pipe sleeve 5 and are detachably and fixedly connected to the rear locking mechanism 11. This is convenient for the production, manufacture, disassembly and assembly of the combined frame of the whole transport vehicle. At the same time, it also ensures the overall stability of the connected integral structure and meets the actual operation and use requirements of the vehicle body.

[0026] A first transverse connecting frame 12 is also connected and provided between the two rear connecting pipe sleeves 5 of the rear axle chassis frame 2; a second transverse connecting frame 13 is also connected and provided between the two front connecting pipe sleeves 4 of the front axle chassis frame 1. An intermediate longitudinal frame body 303 is detachably connected between the first transverse connecting frame 12 and the second transverse connecting frame 13. The intermediate longitudinal frame body 303 is arranged in parallel with the left main beam 301 and the right main beam 302, and the three are in the same horizontal plane. This kind of structural design can evenly disperse the bearing gravity of the whole frame, making it stable during transportation and effectively increasing its maximum load-bearing weight.

[0027] The combined frame of the transport vehicle of the present invention. The middle longitudinal frame body 303 is also a support square tube structure, and its front and rear ends are respectively detachably connected to the first transverse connection frame 12 and the second transverse connection frame 13 through flange structures. This connection structure facilitates the disassembly and assembly of the vehicle body. At the same time, it also ensures that after assembly, the vehicle body weight is evenly distributed, effectively reducing the bearing weight of the left main beam 301 and the right main beam 302, and extending the service life of the device.

[0028] A second transverse connection frame 13 is connected between the rear ends of the two front connection pipe sleeves 4 of the front axle chassis frame 1; a third transverse connection frame 14 parallel to the second transverse connection frame 13 is also connected between the front ends of the two front connection pipe sleeves 4 of the front axle chassis frame 1, and a fourth longitudinal connection support frame 15 coinciding with the central axis of the middle longitudinal frame body 303 is also connected between the second transverse connection frame 13 and the third transverse connection frame 14, further dispersing the load of the left main beam 301 and the right main beam 302 to the fourth longitudinal connection support frame 15 and the middle longitudinal frame body 303, further ensuring the overall structural stability and bearing capacity of the bottom frame.

[0029] A transverse front wheel support frame 16 is connected to the bottom of the front axle chassis frame 1. The middle of the transverse front wheel support frame 16 is connected to the fourth longitudinal connection support frame 15 through a first suspension buckle 17; both ends of the transverse front wheel support frame 16 are respectively connected to the front wheel devices 19 on both sides. First vertical support frames 18 matching the installation of the front axle are symmetrically arranged on the upper surfaces of the two front connection pipe sleeves 4. Three groups of first vertical support frames 18 are symmetrically arranged on the upper surfaces of the two front connection pipe sleeves 4. The two outer groups of first vertical support frames 18 are connected to the front wheel device 19 through a Y-shaped connection frame 20, and the middle group of first vertical support frames 18 is connected to the outer end of the transverse front wheel support frame 16 through a first connecting rod 21. This connection structure can effectively and stably connect the front axle to the front axle chassis frame 1, ensure the stability of the connection structure, and at the same time is also convenient for disassembly and assembly. No special reset structure is required, and the accurate installation of the front axle can be achieved through simple assembly. The operation is convenient, time-saving and labor-saving, and effectively reduces the floor area after the entire frame is disassembled.

[0030] A steering adjustment mechanism is also connected to the two front wheel devices 19, which is convenient for connecting with the steering device above the frame to achieve accurate operation of the front axle steering.

[0031] A set of fifth bottom crossbars 22 matching the rear axle are also connected to the bottoms of the two rear connecting pipe sleeves 5. Both ends of the fifth bottom crossbars 22 are longer than the two ends of the rear connecting pipe sleeves 5, and the upper surfaces of their extended ends are also connected with second vertical support frames 23. A longitudinal rear wheel support frame 24 is connected between the front and rear second vertical support frames 23, and the two ends of the rear axle are connected to the longitudinal rear wheel support frame 24 through second suspension buckles 25. The above structure is also accurate and in place, realizing the installation and disassembly of the axle. After disassembly, the structure occupies a small area, and after assembly, precise installation of the rear axle can be achieved without special positioning adjustment. The operation is convenient, saving time and effort.

[0032] As Figure 4 and Figure 5 shown, the combined frame of the transport vehicle of the present invention is a detachable installation structure frame, and the operation steps in the production installation and disassembly process are as follows: Assembly process: First, the relevant devices of the front axle and the rear axle are respectively installed on the front axle chassis frame 1 and the rear axle chassis frame 2.

[0033] The left main beam 301 and the right main beam 302 pass through the front connecting pipe sleeve 4 of the front axle chassis frame 1, the inner support frames of the left and right boom bodies, and the rear connecting pipe sleeve 5 on the rear axle chassis frame 2 from front to back. After the left main beam 301 and the right main beam 302 pass through the front connecting pipe sleeve 4 and the rear connecting pipe sleeve 5 as inner square pipes, the protruding part of the front end of the front connecting pipe sleeve 4 is inserted into the front bumper 8 and locked and limited by the front locking mechanism 9.

[0034] The front and rear ends of the middle longitudinal frame body 303 are respectively connected to the first transverse connecting frame 12 and the second transverse connecting frame 13 through flange structures. At this time, the rear axle chassis frame 2 is also limited to a specific position between the left main beam 301 and the right main beam 302. After the protruding parts of the rear ends of the left main beam 301 and the right main beam 302 are inserted into the tail bumper 10, they are locked and fixed by the rear locking mechanism 11.

[0035] The right boom body 6 and the left boom body 7 are horizontal support frames, and their inner support frames have horizontal extension support frames on the outside for expanding the support area of the frame and reducing the load borne by a single frame body.

[0036] The combined frame of the transport vehicle designed above is simple and ingenious, convenient for installation and combination, saving time and effort, and does not require special adjustment, and can achieve rapid and accurate positioning installation as much as possible.

[0037] Disassembly process: First, open the front locking mechanism 9 on the front bumper 8 and remove the front bumper 8 from the frame; open the rear locking mechanism 11 on the tail bumper 10 and remove the tail bumper 10 from the frame, so that the front and rear ends of the left main beam 301 and the right main beam 302 are in a free state.

[0038] Then loosen the bolts of the flange structures at the front and rear ends of the middle longitudinal frame 303, so that it is disconnected from both the first transverse connecting frame 12 and the second transverse connecting frame 13.

[0039] Remove the front connecting pipe sleeve 4 of the front axle chassis frame 1 and the rear connecting pipe sleeve 5 of the rear axle chassis frame 2 from the front ends of the left main beam 301 and the right main beam 302 respectively. Finally, remove the right boom frame 6 and the left boom frame 7 from the left main beam 301 and the right main beam 302 respectively. The disassembly of the entire vehicle frame is realized. The entire disassembly process is time-saving and labor-saving, and the occupied area of the disassembled vehicle frame parts is small, effectively reducing its transportation cost and meeting the actual long-distance transportation requirements.

[0040] In summary, the combined vehicle frame of the present invention has a clever device structure design. On the basis of ensuring the structural stability of the overall use, it significantly improves the load-bearing capacity and service life of the vehicle frame. It is convenient for the production, disassembly and assembly of the entire combined vehicle frame. After assembly, the precise positioning of the socket structure can be realized, ensuring the stability of the connection structure, evenly dispersing the vehicle body weight, effectively reducing the load-bearing capacity of the left main beam 301 and the right main beam 302, and extending the service life of the device. After disassembly, the overall occupied area of the device is small, which is beneficial to long-distance transportation, significantly reducing the transportation cost. At the same time, it is also easy to reassemble, accurately position and install, saving time and labor, significantly improving the installation efficiency, and meeting the actual use requirements.

[0041] The above are only examples of the present invention. For example, the specific length dimensions of the front axle chassis frame 1, the middle connecting frame 3 and the rear axle chassis frame 2 can be selected according to the length required by the actual vehicle body. The left main beam 301 and the right main beam 302 are of equal length, and their lengths are greater than or equal to the sum of the lengths of the front connecting pipe sleeve 4, the rear connecting pipe sleeve 5 and the inner support frame, and the combined vehicle frame of the present invention can be realized.

[0042] The above description is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A combined frame of a transport vehicle, characterized in that, The vehicle frame is a detachable installation structure vehicle frame. The detachable installation structure vehicle frame includes a front axle chassis frame (1), a middle connecting frame (3), and a rear axle chassis frame (2) from the head to the tail. The three module frames are detachably assembled by inserting an outer square tube into an inner square tube respectively.

2. The combined frame of a transport vehicle according to claim 1, characterized in that, The middle connecting frame (3) includes a left main beam (301) and a right main beam (302). The front axle chassis frame (1) and the rear axle chassis frame (2) are respectively provided with a front connecting pipe sleeve (4) and a rear connecting pipe sleeve (5) that match the left main beam (301) and the right main beam (302). The front and rear ends of the left main beam (301) and the right main beam (302) can respectively pass through the front connecting pipe sleeve (4) and the rear connecting pipe sleeve (5).

3. The combined frame of a transport vehicle according to claim 1, characterized in that, The left main beam (301) and the right main beam (302) of the middle connecting frame (3) are both inner square tubes. The middle connecting frame (3) further includes a right arm frame body (6) and a left arm frame body (7) sleeved on the left main beam (301) and the right main beam (302). The right arm frame body (6) and the left arm frame body (7) are horizontal support frames, and the inner support frames thereof are outer square tubes that match the inner square tube structure of the main beam. The inner square tubes of the left main beam (301) and the right main beam (302) longitudinally pass through the inner square tubes on the left arm frame body (7) and the right arm frame body (6) respectively.

4. The combined frame of a transport vehicle according to claim 3, characterized in that The left main beam (301) and the right main beam (302) are of equal length, and their length is greater than or equal to the sum of the lengths of the front connecting pipe sleeve (4), the rear connecting pipe sleeve (5), and the inner support frame.

5. The combined frame of a transport vehicle according to claim 4, characterized in that, A front bumper (8) is further connected to the front side of the front axle chassis frame (1). The front bumper (8) is provided with a front locking mechanism (9) that is detachably and fixedly connected to the front ends of the left main beam (301) and the right main beam (302). The front ends of the left main beam (301) and the right main beam (302) pass through the outer square tube of the front connecting pipe sleeve (4) and are detachably and fixedly connected to the front locking mechanism (9). A tail bumper (10) is connected to the rear side of the rear axle chassis frame (2). The tail bumper (10) is provided with a rear locking mechanism (11) that is detachably and fixedly connected to the rear ends of the left main beam (301) and the right main beam (302). The rear ends of the left main beam (301) and the right main beam (302) pass through the outer square tube of the rear connecting pipe sleeve (5) and are detachably and fixedly connected to the rear locking mechanism (11).

6. The combined frame of a transport vehicle according to claim 5, characterized in that, A first transverse connecting frame (12) is further connected between the two rear connecting pipe sleeves (5) of the rear axle chassis frame (2). A second transverse connecting frame (13) is further connected between the two front connecting pipe sleeves (4) of the front axle chassis frame (1). An intermediate longitudinal frame body (303) is detachably connected between the first transverse connecting frame (12) and the second transverse connecting frame (13). The intermediate longitudinal frame body (303) is arranged parallel to the left main beam (301) and the right main beam (302), and the three are in the same horizontal plane.

7. The combination vehicle frame according to claim 6, characterized in that, The middle longitudinal frame body (303) is also a support square pipe structure, and its front and rear ends are respectively detachably connected to the first transverse connecting frame (12) and the second transverse connecting frame (13) through flange structures.

8. The combined frame of a transport vehicle according to claim 6, characterized in that A second transverse connecting frame (13) is connected between the rear ends of two front connecting pipe sleeves (4) of the front axle chassis frame (1); a third transverse connecting frame (14) parallel to the second transverse connecting frame (13) is also connected between the front ends of the two front connecting pipe sleeves (4) of the front axle chassis frame (1), and a fourth longitudinal connecting support frame (15) coinciding with the central axis of the middle longitudinal frame body (303) is also connected between the second transverse connecting frame (13) and the third transverse connecting frame (14); A transverse front wheel support frame (16) is connected to the bottom of the front axle chassis frame (1), and the middle of the transverse front wheel support frame (16) is connected to the fourth longitudinal connecting support frame (15) through a first suspension buckle (17); the two ends of the transverse front wheel support frame (16) are respectively connected to the front wheel devices (19) on both sides; On the upper surfaces of the two front connecting pipe sleeves (4), first vertical support frames (18) matching the installation of the front axle are symmetrically arranged respectively.

9. A combined frame of a transport vehicle according to claim 6, characterized in that, Three groups of first vertical support frames (18) are symmetrically arranged respectively on the upper surfaces of the two front connecting pipe sleeves (4), and the two outer groups of the first vertical support frames (18) are connected to the front wheel device (19) through a Y-shaped connecting frame (20), The first vertical support frame (18) in the middle group is connected to the outer end of the transverse front wheel support frame (16) through a first connecting rod (21); A steering adjustment mechanism is also connected to the two front wheel devices (19).

10. The combined frame of a transport vehicle according to claim 6, characterized in that, A group of fifth bottom cross bars (22) matching the rear axle are also connected to the bottoms of the two rear connecting pipe sleeves (5), both ends of the fifth bottom cross bar (22) are longer than the two ends of the rear connecting pipe sleeve (5), and a second vertical support frame (23) is also connected to the upper surface of the extended end; A longitudinal rear wheel support frame (24) is connected between the front and rear second vertical support frames (23), and the two ends of the rear axle are connected to the longitudinal rear wheel support frame (24) through second suspension buckles (25).

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