Platform automobile dashboard cross beam structure and assembling method

Abstract

The invention relates to the technical field of automobile part assembly, in particular to a platform automobile dashboard cross beam structure and an assembly method.The platform automobile dashboard cross beam structure comprises a thick tubular beam and a thin tubular beam, a left end plate sub-assembly is fixedly installed at one end of the thick tubular beam, and a right end plate sub-assembly is fixedly installed at one end of the thin tubular beam; a thick and thin tubular beam connecting piece is arranged between the thick tubular beam and the thin tubular beam, a left middle supporting sub-assembly is fixedly installed at the bottom of the thick and thin tubular beam connecting piece, a right middle supporting sub-assembly is fixedly installed at the bottom of the thin tubular beam, and a middle channel connecting support is fixedly installed between the right middle supporting sub-assembly and the left middle supporting sub-assembly. A thick tubular beam and a thin tubular beam are welded through a thick and thin tubular beam connecting piece to form a cross beam body supporting structure, the two ends of the cross beam body supporting structure are welded through a left end plate sub-assembly and a right end plate sub-assembly to achieve installation with a body in white, the two sides of the thick and thin tubular beam connecting piece are in flanging lap joint, and the situation that a butt joint scheme between tubular beams is difficult to match is avoided; and stress is easy to concentrate.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts assembly, and in particular to a platform automobile instrument panel crossbeam structure and an assembly method. Background Art

[0002] The body in white refers to the body after welding but before painting. The painted body in white plus the dashboard crossbeam, seats, windshield, carpet, interior trim and electronic and electrical systems, plus the chassis system and the powertrain system make up the whole vehicle. The dashboard crossbeam serves as the carrier of the dashboard and major electrical components in the passenger compartment. It needs to provide a rich installation structure and adapt to different vehicle models. The manufacturing process adopts stamping and welding. Under the premise of platformization and personalized customization, the main structure of most dashboard crossbeam products remains basically the same, and the difference in local layout causes changes in the product.

[0003] In the prior art, for example, a patent with publication number CN109774796B discloses an instrument panel assembly and an assembly method of the instrument panel assembly, including an instrument panel assembly, a cross beam under a front windshield, which cooperates with the instrument panel assembly in a limiting manner, and a steering support frame, wherein the instrument panel assembly is assembled on the steering support frame, and identification holes are respectively provided at both ends of the steering support frame along the length direction of the cross beam of the steering support frame, wherein the identification holes are used for capturing and positioning of a visual system of an installation device, and the identification holes are configured to cooperate with the mechanical arm of the installation device in a limiting manner.

[0004] The above structure uses a robotic arm to move to pre-match the dashboard assembly with the lower crossbeam of the front windshield to be assembled. However, in the dashboard crossbeam assembly, when the dashboard crossbeam is partially modified, the difference in thickness of the tube beams does not match a variety of vehicle models, and the docking solutions between the dashboard tube beams are difficult to match, and the problem of stress concentration is serious. Summary of the invention

[0005] In view of this, the purpose of the present invention is to propose a platform-based automobile instrument panel crossbeam structure and assembly method to solve the problems that when the instrument panel crossbeam is partially modified, the difference in thickness of the tube beams does not match a variety of vehicle models, and the docking schemes between the instrument panel tube beams are difficult to match, and stress is easily concentrated.

[0006] Based on the above purpose, the present invention provides a platform-based automobile instrument panel crossbeam structure, including a thick tube beam and a thin tube beam, one end of the thick tube beam is fixedly installed with a left end plate sub-assembly, and one end of the thin tube beam is fixedly installed with a right end plate sub-assembly, and the left end plate sub-assembly and the right end plate sub-assembly are used for installation between the body-in-white; the outsides of the thick tube beam and the thin tube beam are fixedly installed with IP auxiliary positioning brackets, the outsides of the thick tube beam are respectively installed with a front wall connecting plate and a steering column mounting bracket sub-assembly, and the outside side of the thin tube beam is fixedly installed with an IP auxiliary positioning bracket. A PAB mounting bracket and an HVAC right mounting bracket are installed secondarily, an IP main positioning bracket is arranged between the front connecting plate and the steering column mounting bracket subassembly, and the IP main positioning bracket is fixedly installed on the thick tube beam; a thick and thin tube beam connecting piece is arranged between the thick tube beam and the thin tube beam, a left middle support subassembly is fixedly installed on the bottom of the thick and thin tube beam connecting piece, a right middle support subassembly is fixedly installed on the bottom of the thin tube beam, and a middle channel connecting bracket is fixedly installed between the right middle support subassembly and the left middle support subassembly.

[0007] Preferably, the thick and thin tubular beam connecting member comprises a tubular beam lap reinforcement plate and a thick and thin tubular beam lap plate, the tubular beam lap reinforcement plate and the thick and thin tubular beam lap plate are U-shaped and interlocked, and the thick tubular beam and the thin tubular beam are respectively welded on both sides of the thick and thin tubular beam lap plate.

[0008] Preferably, the left center support subassembly comprises a left center support body, and the top end of the left center support body is welded to the bottom end of the tubular beam lap reinforcement plate.

[0009] Preferably, the right center support subassembly includes a right center support body, a right center support connecting plate is fixedly installed on the top end of the right center support body, a center channel connecting bracket is fixedly installed between the right center support body and the left center support body, and the right center support connecting plate is welded to the outside of the thin tube beam.

[0010] Preferably, the left center support body and the right center support body are both formed by a tubular beam stamping structure, and an HVAC positioning bracket is fixedly installed on one side of the left center support body, the right center support body and the thin tubular beam.

[0011] Preferably, the left end plate subassembly and the right end plate subassembly both include an end plate body installed on one end of the thick tube beam and the thin tube beam, a mounting sleeve is fixedly installed on one side of the end plate body, an end plate reinforcement plate is fixedly installed on one end of the mounting sleeve, and the end plate reinforcement plate is welded to the end plate body.

[0012] The embodiment of the present specification also provides an assembly method for the above-mentioned platform-based automobile instrument panel crossbeam structure, including the following steps: S101, installation of left and right end plate sub-assemblies; first, sequential assembly is performed, the installation sleeves in the left end plate sub-assembly and the right end plate sub-assembly are connected to the end plate body and the end plate reinforcement plate by welding, the flange position is adjusted to match the overlap of the thick tube beam and the thin tube beam at different positions, and then the assembled left end plate sub-assembly and the right end plate sub-assembly are tooling positioned with the thick tube beam and the thin tube beam, and after positioning, they are respectively welded to one end of the thick tube beam and the thin tube beam; S102, connection of the positioning brackets of each part: first, the front wall connecting plate and the PAB mounting bracket are positioned and then welded to the thick tube beam and the thin tube beam respectively, and then the steering column mounting bracket sub-assembly is welded to the other side of the front wall connecting plate, and the HVAC right mounting bracket is welded to one side of the thin tube beam close to the PAB mounting bracket, and at the same time, the HVAC positioning bracket is welded to the right middle support using a submerged arc welding machine. The main body, the left middle support body and the outside of the thin tube beam, then the IP main positioning bracket and the IP auxiliary positioning bracket are positioned and welded to the specified position of the thick tube beam, and the preliminary assembly is completed on the thick tube beam and the thin tube beam; S103, support sub-assembly installation; the middle channel connecting bracket is welded between the right middle support body and the left middle support body, and the left middle support sub-assembly and the right middle support sub-assembly are assembled. The assembled right middle support sub-assembly is installed and positioned with the thin tube beam, so that the right middle support connecting plate is welded to the outside of the thin tube beam; S104, thick and thin tube beam installation; the thick and thin tube beam connector is first positioned with the assembled thick tube beam and the assembled thin tube beam through tooling, and then arc welding is used to weld them into a sequential assembly. During the process, the two ends of the thick and thin tube beam connector are respectively provided with flanged sleeves to match the thick tube beam and the thin tube beam for welding. In the subsequent assembly, the bottom flange of the thick and thin tube beam connector is provided with the left middle support sub-assembly for cooperation welding to form the main support structure of the crossbeam.

[0013] The beneficial effects of the present invention are as follows: a main crossbeam support structure is formed by welding a thick tube beam and a thin tube beam through a thick and thin tube beam connector. The two ends of the main crossbeam support structure are installed with the body-in-white by welding a left end plate subassembly and a right end plate subassembly. While providing installation, it also serves as a reinforcement to improve the overall structural rigidity and strength. At the same time, the right middle support subassembly and the left middle support subassembly at the center channel are adaptively matched with the tube beam welding. The flanges on both sides of the thick and thin tube beam connectors are overlapped to avoid the difficulty in matching the docking schemes between the tube beams and the problem of easy stress concentration. At the same time, the thick and thin tube beam connectors are adaptively adjusted with the arrangement of the tube beams on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a front view structural schematic diagram of the present invention as a whole; Figure 3 It is a schematic diagram of the three-dimensional structure of the support subassembly of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the end plate subassembly of the present invention.

[0016] The markings in the figure are: 1. Left end plate subassembly; 2. Right end plate subassembly; 3. Left middle support subassembly; 4. Right middle support subassembly; 5. Thick and thin tube beam connector; 6. Front wall connecting plate; 7. IP main positioning bracket; 8. IP auxiliary positioning bracket; 9. Steering column mounting bracket subassembly; 10. HVAC positioning bracket; 11. Center channel connecting bracket; 12. PAB mounting bracket; 13. HVAC right mounting bracket; 15. Thick tube beam; 16. Thin tube beam; 17. End plate body; 18. End plate reinforcement plate; 19. Mounting sleeve; 20. Left middle support body; 21. Right middle support body; 22. Right middle support connecting plate; 23. Tube beam lap reinforcement plate; 24. Thick and thin tube beam lap plate. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0018] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a platform-based automobile instrument panel crossbeam structure includes a thick tube beam 15 and a thin tube beam 16. A left end plate subassembly 1 is fixedly installed at one end of the thick tube beam 15, and a right end plate subassembly 2 is fixedly installed at one end of the thin tube beam 16. The left end plate subassembly 1 and the right end plate subassembly 2 are used for installation between the body-in-white; IP auxiliary positioning brackets 8 are fixedly installed on the outside of the thick tube beam 15 and the thin tube beam 16, and a front wall connecting plate 6 and a steering column mounting bracket subassembly 9 are respectively installed on both sides of the outside of the thick tube beam 15, and the thin tube beam 16 is installed on one side of the outside in sequence. An IP main positioning bracket 7 is arranged between the PAB mounting bracket 12 and the HVAC right mounting bracket 13, the front connecting plate 6 and the steering column mounting bracket subassembly 9, and the IP main positioning bracket 7 is fixedly installed on the thick tube beam 15; a thick and thin tube beam connecting member 5 is arranged between the thick tube beam 15 and the thin tube beam 16, and a left middle support subassembly 3 is fixedly installed on the bottom of the thick and thin tube beam connecting member 5, and a right middle support subassembly 4 is fixedly installed on the bottom of the thin tube beam 16, and a middle channel connecting bracket 11 is fixedly installed between the right middle support subassembly 4 and the left middle support subassembly 3.

[0019] In this embodiment, a thick tube beam 15 and a thin tube beam 16 are welded through a thick and thin tube beam connector 5 to form a main crossbeam support structure. The two ends of the main crossbeam support structure are welded through a left end plate subassembly 1 and a right end plate subassembly 2 to achieve installation with the body-in-white, which not only provides installation but also serves as a reinforcement to improve the overall structural rigidity and strength. At the same time, the right middle support subassembly 4 and the left middle support subassembly 3 at the center channel are adaptively matched with the tube beam welding, and the thick and thin tube beam connectors 5 are flanged and overlapped on both sides to avoid difficulties in matching the docking schemes between the tube beams and stress concentration problems. At the same time, the thick and thin tube beam connectors 5 are adaptively adjusted with the arrangement of the tube beams on both sides.

[0020] As an implementation method, Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the thick and thin tubular beam connecting member 5 includes a tubular beam lap reinforcement plate 23 and a thick and thin tubular beam lap plate 24. The tubular beam lap reinforcement plate 23 and the thick and thin tubular beam lap plate 24 are U-shaped and interlocked. The thick tubular beam 15 and the thin tubular beam 16 are welded to both sides of the thick and thin tubular beam lap plate 24 respectively.

[0021] In this embodiment, the thick and thin tube beam connectors 5 are designed with a U-shaped buckle to form a box-like structure with flanges on both sides overlapping each other, thereby optimizing the difficult matching and stress concentration problems of the traditional cross beam docking scheme. At the same time, the flange position can be adaptively adjusted with the arrangement of the tube beams on both sides, which is more conducive to the platformization of products.

[0022] The thick and thin tube beam connectors 5 change the relative positions of the flange surfaces on both sides to match the design of different tube beam layout positions. The openings at both ends allow the electrophoretic liquid to enter smoothly to avoid electrophoresis gas accumulation, and on the other hand, they can also have a certain weight reduction effect. In addition, the structure adopts a box-shaped structure to form a welding sub-assembly, which can be purchased separately to achieve weld dispersion and improve production efficiency.

[0023] As an implementation method, Figure 3 As shown, the left middle support subassembly 3 includes a left middle support body 20 , and the top end of the left middle support body 20 is welded to the bottom of the tubular beam lap reinforcement plate 23 .

[0024] In this embodiment, during assembly, the bottom flange of the thick and thin tube beam connector 5 is provided to cooperate with the left middle support sub-assembly 3 for welding, thereby improving the welding accuracy.

[0025] As an implementation method, Figure 3 As shown, the right center support sub-assembly 4 includes a right center support body 21, a right center support connecting plate 22 is fixedly installed on the top end of the right center support body 21, a center channel connecting bracket 11 is fixedly installed between the right center support body 21 and the left center support body 20, and the right center support connecting plate 22 is welded to the outside of the thin tube beam 16.

[0026] In this embodiment, the right center support subassembly 4 and the left center support subassembly 3 cooperate stably, which plays a certain role in improving the connection stiffness and strength, suppresses the deformation generated during the product production welding process, improves the product production accuracy, and is beneficial to the assembly of parts and the matching installation of peripheral parts.

[0027] As an implementation method, Figure 3 As shown, the left middle support body 20 and the right middle support body 21 are both formed by a tube beam stamping structure, and an HVAC positioning bracket 10 is fixedly installed on one side of the left middle support body 20, the right middle support body 21 and the thin tube beam 16.

[0028] In this embodiment, the left middle support body 20 and the right middle support body 21 at the middle channel adopt a tube beam stamping structure to avoid the weight increase caused by the overlap of sheet metal parts and reduce the length of the assembly weld.

[0029] As an implementation method, Figure 1 , Figure 2 , Figure 4 As shown, the left end plate subassembly 1 and the right end plate subassembly 2 both include an end plate body 17 installed at one end of the thick tube beam 15 and the thin tube beam 16, a mounting sleeve 19 is fixedly installed on one side of the end plate body 17, an end plate reinforcement plate 18 is fixedly installed on one end of the mounting sleeve 19, and the end plate reinforcement plate 18 is welded to the end plate body 17.

[0030] In this embodiment, one end of the thick tube beam 15 and the thin tube beam 16 are installed on the body-in-white by welding the left end plate sub-assembly 1 and the right end plate sub-assembly 2; the end plate body 17 can match the cross beam overlap at different positions by adjusting the flange position, the end plate reinforcement plate 18 is a universal structure for the left and right, and the installation sleeve 19 is connected to the end plate body 17 and the end plate reinforcement plate 18 by welding, which not only provides installation but also serves as a reinforcement to improve the rigidity and strength of the overall cross beam structure.

[0031] As an implementation method, Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a method for assembling a platform-based automobile instrument panel crossbeam structure comprises the following steps: S101, installing the left and right end plate subassemblies; firstly, sequentially assembling, installing sleeves 19 in the left end plate subassembly 1 and the right end plate subassembly 2, connecting the sleeves 19 with the end plate body 17 and the end plate reinforcement plate 18 by welding, adjusting the flange position to match the overlap of the thick tube beam 15 and the thin tube beam 16 at different positions, and then positioning the assembled left end plate subassembly 1 and the right end plate subassembly 2 with the thick tube beam 15 and the thin tube beam 16, and then performing tooling positioning, and then sequentially assembling. S102, the positioning brackets of each part are connected: first, the front wall connecting plate 6 and the PAB mounting bracket 12 are positioned and then welded to the thick tube beam 15 and the thin tube beam 16 respectively, and then the steering column mounting bracket subassembly 9 is welded to the other side of the front wall connecting plate 6, and the HVAC right mounting bracket 13 is welded to one side of the thin tube beam 16 close to the PAB mounting bracket 12. At the same time, the HVAC positioning bracket 10 is welded to the right middle support body 21 and the left The IP main positioning bracket 7 and the IP auxiliary positioning bracket 8 are then positioned and welded to the specified position of the thick tube beam 15, and the initial assembly is completed on the thick tube beam 15 and the thin tube beam 16; S103, support subassembly installation; the middle channel connecting bracket 11 is welded between the right middle support body 21 and the left middle support body 20, and the left middle support subassembly 3 and the right middle support subassembly 4 are assembled. After assembly, the right middle support subassembly 4 is installed and positioned with the thin tube beam 16 , so that the right middle support connecting plate 22 is welded to the outside of the thin tube beam 16; S104, thick and thin tube beam installation; the thick and thin tube beam connector 5 is first positioned with the assembled thick tube beam 15 and the assembled thin tube beam 16 through tooling, and then arc welding is adopted to form a sub-sequence assembly. During the process, the two ends of the thick and thin tube beam connector 5 are respectively provided with flanged sleeves to match the thick tube beam 15 and the thin tube beam 16 for welding. In the subsequent assembly, the bottom flange of the thick and thin tube beam connector 5 is provided to cooperate with the left middle support sub-assembly 3 for welding to form the main support structure of the crossbeam.

[0032] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0033] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A platform-type automobile instrument panel crossbeam structure, comprising a thick tube beam (15) and a thin tube beam (16), characterized in that: A left end plate subassembly (1) is fixedly mounted on one end of the thick tube beam (15), and a right end plate subassembly (2) is fixedly mounted on one end of the thin tube beam (16); the left end plate subassembly (1) and the right end plate subassembly (2) are used for installation between the body-in-white; the outsides of the thick tube beam (15) and the thin tube beam (16) are both fixedly mounted with IP auxiliary positioning brackets (8); the outsides of the thick tube beam (15) are respectively mounted with a front wall connecting plate (6) and a steering column mounting bracket subassembly (9); and the outside of the thin tube beam (16) is sequentially mounted with a PAB mounting bracket (12) and an HVAC right mounting bracket. (13), an IP main positioning bracket (7) is arranged between the front wall connecting plate (6) and the steering column mounting bracket subassembly (9), and the IP main positioning bracket (7) is fixedly mounted on the thick tube beam (15); a thick and thin tube beam connecting member (5) is arranged between the thick tube beam (15) and the thin tube beam (16), a left middle support subassembly (3) is fixedly mounted on the bottom of the thick and thin tube beam connecting member (5), a right middle support subassembly (4) is fixedly mounted on the bottom of the thin tube beam (16), and a middle channel connecting bracket (11) is fixedly mounted between the right middle support subassembly (4) and the left middle support subassembly (3).

2. The platform-based automobile instrument panel crossbeam structure according to claim 1, characterized in that: The thick and thin tubular beam connecting member (5) comprises a tubular beam lap reinforcement plate (23) and a thick and thin tubular beam lap plate (24); the tubular beam lap reinforcement plate (23) and the thick and thin tubular beam lap plate (24) are arranged in a U-shaped interlocking manner; the thick tubular beam (15) and the thin tubular beam (16) are respectively welded to two sides of the thick and thin tubular beam lap plate (24).

3. The platform-based automobile instrument panel crossbeam structure according to claim 2, characterized in that: The left middle support sub-assembly (3) comprises a left middle support body (20), the top end of the left middle support body (20) being welded to the bottom of the tubular beam lap reinforcement plate (23).

4. The platform-based automobile instrument panel crossbeam structure according to claim 3, characterized in that: The right middle support subassembly (4) comprises a right middle support body (21), a right middle support connecting plate (22) being fixedly mounted on the top end of the right middle support body (21), a middle channel connecting bracket (11) being fixedly mounted between the right middle support body (21) and the left middle support body (20), and the right middle support connecting plate (22) being welded to the outside of the thin tube beam (16).

5. The platform-based automobile instrument panel cross beam structure according to claim 4, characterized in that: The left middle support body (20) and the right middle support body (21) are both formed by a tube beam stamping structure, and an HVAC positioning bracket (10) is fixedly mounted on one side of the left middle support body (20), the right middle support body (21) and the thin tube beam (16).

6. The platform-based automobile instrument panel crossbeam structure according to claim 5, characterized in that: The left end plate sub-assembly (1) and the right end plate sub-assembly (2) both comprise an end plate body (17) mounted on one end of a thick tube beam (15) and a thin tube beam (16); a mounting sleeve (19) is fixedly mounted on one side of the end plate body (17); an end plate reinforcement plate (18) is fixedly mounted on one end of the mounting sleeve (19); and the end plate reinforcement plate (18) is welded to the end plate body (17).

7. An assembly method of a platform-type automobile instrument panel cross beam structure, applied to a platform-type automobile instrument panel cross beam structure as claimed in claim 6, characterized in that: The method comprises the following steps: S101, installing the left and right end plate subassemblies; firstly assembling in sequence, installing a sleeve (19) in the left end plate subassembly (1) and the right end plate subassembly (2) and connecting them to the end plate body (17) and the end plate reinforcement plate (18) by welding, adjusting the flange position to match the overlap of the thick tube beam (15) and the thin tube beam (16) at different positions, and then positioning the assembled left end plate subassembly (1) and the right end plate subassembly (2) with the thick tube beam (15) and the thin tube beam (16) by tooling, and after positioning, welding them to the thick tube beam (15) and the thin tube beam (16) respectively. 6); S102, the positioning brackets of each part are connected: first, the front wall connecting plate (6) and the PAB mounting bracket (12) are positioned and then welded to the thick tube beam (15) and the thin tube beam (16), respectively, and then the steering column mounting bracket subassembly (9) is welded to the other side of the front wall connecting plate (6), the HVAC right mounting bracket (13) is welded to one side of the thin tube beam (16) close to the PAB mounting bracket (12), and at the same time, the HVAC positioning bracket (10) is welded to the right middle support body (21), the left middle support body (20) and the thin The outside of the tubular beam (16); then the IP main positioning bracket (7) and the IP auxiliary positioning bracket (8) are positioned and welded to the designated positions of the thick tubular beam (15), and the preliminary assembly is completed on the thick tubular beam (15) and the thin tubular beam (16); S103, support subassembly installation; the middle channel connecting bracket (11) is welded between the right middle support body (21) and the left middle support body (20), and the left middle support subassembly (3) and the right middle support subassembly (4) are assembled. After the assembly, the right middle support subassembly (4) and the thin tubular beam (16) are installed and positioned so that The right middle support connecting plate (22) is welded to the outside of the thin tube beam (16); S104, thick and thin tube beams are installed; the thick and thin tube beam connecting piece (5) is first positioned with the assembled thick tube beam (15) and the assembled thin tube beam (16) through a tooling, and then arc welding is used to form a sub-sequence assembly. During the process, the two ends of the thick and thin tube beam connecting piece (5) are respectively provided with flanged sleeves to match the thick tube beam (15) and the thin tube beam (16) for welding. In the subsequent assembly, the bottom flange of the thick and thin tube beam connecting piece (5) is provided to cooperate with the left middle support sub-assembly (3) for welding to form a crossbeam main body support structure.

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