Combined longitudinal beam type integrated aluminum alloy frame

Abstract

The invention belongs to the technical field of new energy automobile frames, and particularly relates to a combined longitudinal beam type integrated aluminum alloy frame which comprises a main longitudinal beam and two auxiliary longitudinal beams arranged on the two sides of the main longitudinal beam and further comprises two special-shaped outer edge longitudinal beams arranged on the two sides of the main longitudinal beam. The two auxiliary longitudinal beams are arranged between the two special-shaped outer edge longitudinal beams, the two ends of the two special-shaped outer edge longitudinal beams are integrally bent to form straight parts, and the two ends of the two auxiliary longitudinal beams are fixedly connected with the two straight parts of the special-shaped outer edge longitudinal beams on the same side. The assembly convenience of the frame can be improved, the bearing capacity of the outer edge of the frame and the overall structural stability can be enhanced, the weight of the frame can be reduced, meanwhile, heat dissipation of the battery units can be assisted, energy consumption is reduced, and detection of the welding airtightness of the frame and detection of the structural stability are facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of new energy vehicle frames, and in particular relates to a combined longitudinal beam type integrated aluminum alloy frame. Background Art

[0002] With the development of the automotive industry, lightweight and high-performance frames have become the key pursuit. The rise of new energy vehicles has brought new challenges to the frame's load-bearing capacity and weight control. The safety of new energy vehicles can be improved through good structural design.

[0003] At present, automobile frames are generally assembled from several longitudinal beams and several cross beams through riveting, welding and other processes to ensure sufficient connection strength. However, with the rapid development of new energy vehicles, they use electricity as a power source, accelerate quickly and are flexible to drive, which puts higher requirements on the weight and structural strength of the frame. The combined longitudinal beam type integrated aluminum alloy frame disclosed in patent announcement number CN113212553B is a product that conforms to this trend; traditional frames mostly use the longitudinal beam in the middle position as the load-bearing body, and the cross beam is installed from the side wall of the longitudinal beam and extends to the outer edge of the frame, resulting in the outermost cross beam end having to be additionally installed with a beam frame structure. This not only greatly increases the complexity of assembly, but also makes the load-bearing capacity at the outer edge of the frame poor, making it difficult to meet the increasingly stringent performance requirements of new energy vehicles for the frame. Summary of the invention

[0004] The purpose of the present invention is to provide a combined longitudinal beam type integrated aluminum alloy frame in view of the above problems.

[0005] To achieve the above object, the present invention adopts the following technical solution: a combined longitudinal beam type integrated aluminum alloy frame, comprising a main longitudinal beam and two secondary longitudinal beams arranged on both sides of the main longitudinal beam, and also comprising: Two special-shaped outer edge longitudinal beams are arranged on both sides of the main longitudinal beam, and two secondary longitudinal beams are arranged between the two special-shaped outer edge longitudinal beams, both ends of the two special-shaped outer edge longitudinal beams are integrally bent to form a straight portion, and both ends of the two secondary longitudinal beams are fixedly connected to the two straight portions of the special-shaped outer edge longitudinal beam on the same side; A connecting assembly is arranged at both ends of the main longitudinal beam, and the main longitudinal beam is connected to two special-shaped outer edge longitudinal beams through the connecting assembly; A plurality of cross beams are arranged between the two special-shaped outer edge longitudinal beams, and each cross beam is fixedly plugged with the side walls of the main longitudinal beam and the secondary longitudinal beam; The battery compartment bottom cover is installed at the middle position of the top of the main longitudinal beam, and the tops of the two secondary longitudinal beams and the special-shaped outer edge longitudinal beam are fixedly connected to the bottom of the battery compartment bottom cover, and the battery compartment bottom cover is installed with a heat dissipation unit.

[0006] Preferably, the connecting assembly includes U-shaped slots opened at both ends of the main longitudinal beam, both ends of the special-shaped outer edge longitudinal beam are bent integrally to form a plug-in portion, and the two plug-in portions on the same side of the two special-shaped outer edge longitudinal beams are pressed against each other, the two plug-in portions on the same side are both clamped in the inside of the U-shaped slot on the same side, and the two plug-in portions on the same side are welded and fixed to the main longitudinal beam.

[0007] Preferably, the heat dissipation unit includes a plurality of box bodies fixedly mounted on the bottom cover of the battery compartment, and each box body is respectively arranged between two cross beams on the same side, and air supply grooves are provided on both sides of the end face of each box body, and an air supply assembly is provided inside each of the box bodies, a plurality of transverse cavities are provided inside the bottom cover of the battery compartment, and an air inlet hole is provided on the lower cavity wall of each transverse cavity, and each air inlet hole is connected with the corresponding air supply groove, and a plurality of connecting holes are provided in the cavity walls of two adjacent transverse cavities, and two air outlet pipes are fixedly connected to the side wall of the bottom cover of the battery compartment, and two exhaust holes connected with the air outlet pipes are provided on the transverse cavity on the same side of the air outlet pipe.

[0008] Preferably, the air supply assembly includes a pushing block arranged inside the box body, sliding blocks are installed at the upper and lower ends of the pushing block, and the pushing block is slidably arranged inside the box body through the sliding blocks, and the inside of the box body is slidably connected with extrusion plates at positions on both sides of the pushing block, and springs are arranged between the two extrusion plates and the inner wall of the box body, and an elastic airbag sleeve is sleeved on the outer side of the spring, and the elastic airbag sleeve is fixedly arranged between the extrusion plate and the inner wall of the box body, a one-way air outlet is opened at a position of the side wall of the box body located inside the elastic airbag sleeve, and the one-way air outlet is connected to the air supply groove, a one-way air replenishment hole is opened at a position of the side wall of the box body located inside the elastic airbag sleeve, and a one-way valve is installed inside the one-way air replenishment hole and the one-way air outlet.

[0009] Preferably, tail gas holes are provided at the rear ends of the two secondary longitudinal beams, and the two exhaust pipes are communicated with the interior of the tail gas hole on the same side.

[0010] Preferably, each of the cross beams is provided with a vent hole inside, and the side wall of each vent hole is provided with a circular hole connected to the exhaust hole, the two secondary longitudinal beams are provided with an inflation tube on one side of the notch of the exhaust hole, and the two inflation tubes are fixedly plugged into the side wall of the straight part of the special-shaped outer edge longitudinal beam on the same side, the two inflation tubes are connected to the exhaust hole on the same side, and the tube walls of the two inflation tubes are fixedly plugged with an air pressure detection tube.

[0011] Preferably, the side walls of the two special-shaped outer edge longitudinal beams include a rear wheel section and a front wheel section, the side walls of the two rear wheel sections are fixedly connected to the side walls of the secondary longitudinal beam on the same side, and connecting columns are fixedly connected between the side walls of the two front wheel sections and the side walls of the secondary longitudinal beam on the same side.

[0012] Preferably, fixing pins are inserted at both ends of the side walls of the main longitudinal beam, and the fixing pins pass through the side walls of two plug-in parts on the same side.

[0013] Compared with the existing technology, the advantages of a combined longitudinal beam integrated aluminum alloy frame are: 1. By cooperating with each other among the main longitudinal beam, two secondary longitudinal beams, two special-shaped outer edge longitudinal beams, the straight portion, the connecting components and a plurality of cross beams, and by the special-shaped outer edge longitudinal beam formed by integral bending, the additional beam structure at the outer edge of the frame can be omitted, which not only improves the convenience of frame assembly, but also greatly improves the load-bearing capacity at the outer edge of the frame and the stability of the overall structure of the frame through the integrated structure, in combination with the main longitudinal beam, the secondary longitudinal beam and the cross beam, and at the same time, can reduce the weight of the frame to a certain extent.

[0014] 2. The battery compartment bottom cover can be used to support and install the battery unit of the new energy vehicle, and the heat dissipation unit can utilize the airflow generated when the vehicle is running to assist the battery unit in rapid heat dissipation, thereby reducing energy consumption to a certain extent.

[0015] 3. Through the coordination of the exhaust holes, vent holes, round holes, inflation tubes and air pressure detection tubes, it is convenient to conduct air tightness detection on the welding positions of the secondary longitudinal beams and cross beams, so that personnel can check the welding defects of the frame conveniently, and it is also convenient for personnel to regularly check the structural stability of the frame in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a combined longitudinal beam type integrated aluminum alloy frame provided by the present invention; Figure 2 It is a schematic diagram of the connection structure of the main longitudinal beam, the secondary longitudinal beam and the special-shaped outer edge longitudinal beam of a combined longitudinal beam type integrated aluminum alloy frame provided by the present invention; Figure 3 The invention provides a combined longitudinal beam integrated aluminum alloy frame. Figure 2 A magnified view of the structure of part A; Figure 4 It is a three-dimensional structural schematic diagram of a battery compartment bottom cover of a combined longitudinal beam type integrated aluminum alloy frame provided by the present invention; Figure 5 It is a schematic diagram of the internal structure of a box body of a combined longitudinal beam type integrated aluminum alloy frame provided by the present invention; Figure 6 It is a cross-sectional structural schematic diagram of a battery compartment bottom cover of a combined longitudinal beam type integrated aluminum alloy frame provided by the present invention; Figure 7 It is a schematic diagram of the connection structure between the secondary longitudinal beam and the cross beam of a combined longitudinal beam type integrated aluminum alloy frame provided by the present invention; Figure 8 The invention provides a combined longitudinal beam integrated aluminum alloy frame. Figure 7 A magnified view of the structure of part B; Fig. 9 The present invention provides a schematic cross-sectional structural diagram of the connection between a secondary longitudinal beam and a cross beam of a combined longitudinal beam type integrated aluminum alloy vehicle frame.

[0017] In the figure: 1 main longitudinal beam, 2 secondary longitudinal beam, 3 special-shaped outer edge longitudinal beam, 4 straight part, 5 connecting component, 51 U-shaped slot, 52 plug-in part, 6 cross beam, 7 battery compartment bottom cover, 8 heat dissipation unit, 81 box body, 82 air supply groove, 83 cross cavity, 84 air inlet, 85 connecting hole, 86 air outlet pipe, 87 exhaust hole, 9 air supply component, 91 push block, 92 sliding block, 93 extrusion plate, 94 spring, 95 elastic air bag cover, 96 one-way air outlet, 97 one-way air replenishment hole, 98 one-way valve, 10 tail hole, 11 ventilation hole, 12 round hole, 13 inflation tube, 14 air pressure detection tube, 15 rear wheel section, 16 front wheel section, 17 connecting column, 18 fixing pin. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] like Figure 1-Figure 9 As shown, a combined longitudinal beam type integrated aluminum alloy frame includes a main longitudinal beam 1 and two secondary longitudinal beams 2 arranged on both sides of the main longitudinal beam 1, and also includes: two special-shaped outer edge longitudinal beams 3, the two special-shaped outer edge longitudinal beams 3 are arranged on both sides of the main longitudinal beam 1, and the two secondary longitudinal beams 2 are arranged between the two special-shaped outer edge longitudinal beams 3, both ends of the two special-shaped outer edge longitudinal beams 3 are integrally bent to form a straight portion 4, both ends of the two secondary longitudinal beams 2 are fixedly connected to the two straight portions 4 of the special-shaped outer edge longitudinal beams 3 on the same side, and the connecting components 5 are arranged at both ends of the main longitudinal beam 1, and the main longitudinal beam The beam 1 is connected to the two special-shaped outer edge longitudinal beams 3 through a connecting component 5. The connecting component 5 includes a U-shaped groove 51 opened at both ends of the main longitudinal beam 1. Both ends of the special-shaped outer edge longitudinal beam 3 are integrally bent to form a plug-in portion 52, and the two plug-in portions 52 on the same side of the two special-shaped outer edge longitudinal beams 3 are pressed against each other, and the two plug-in portions 52 on the same side are both clamped in the inside of the U-shaped groove 51 on the same side. The two plug-in portions 52 on the same side are welded and fixed to the main longitudinal beam 1. The bending transition of the special-shaped outer edge longitudinal beam 3 is rounded, and the wall thickness at the rounded corner is thickened to ensure the structural strength of the bending portion.

[0020] A plurality of cross beams 6 are arranged between the two special-shaped outer edge longitudinal beams 3, and each cross beam 6 is fixedly plugged with the side walls of the main longitudinal beam 1 and the secondary longitudinal beam 2. The battery compartment bottom cover 7 is installed at the middle position of the top of the main longitudinal beam 1, and the tops of the two secondary longitudinal beams 2 and the special-shaped outer edge longitudinal beams 3 are fixedly connected to the bottom of the battery compartment bottom cover 7. The battery compartment bottom cover 7 is installed with a heat dissipation unit 8. The heat dissipation unit 8 includes a plurality of box bodies 81 fixedly installed on the battery compartment bottom cover 7, and each box body 81 is respectively arranged between the two cross beams 6 on the same side, and the end faces of each box body 81 are An air supply groove 82 is opened on the side, and an air supply assembly 9 is arranged inside each box body 81. A plurality of transverse cavities 83 are opened inside the battery compartment bottom cover 7, and an air inlet hole 84 is opened on the lower cavity wall of each transverse cavity 83, and each air inlet hole 84 is connected with the corresponding air supply groove 82. The cavity walls of two adjacent transverse cavities 83 are jointly provided with a plurality of connecting holes 85. Two air outlet pipes 86 are fixedly connected to the side wall of the battery compartment bottom cover 7, and two exhaust holes 87 connected with the air outlet pipe 86 are opened in the transverse cavity 83 on the same side as the air outlet pipe 86.

[0021] The air supply assembly 9 includes a push block 91 disposed inside the box body 81, and a sliding block 92 is installed at both ends of the push block 91. The push block 91 is slidably disposed inside the box body 81 through the sliding block 92. The inside of the box body 81 is slidably connected with a squeeze plate 93 at both sides of the push block 91. A spring 94 is disposed between the two squeeze plates 93 and the inner wall of the box body 81. An elastic air bag sleeve 95 is disposed outside the spring 94, and the elastic air bag sleeve 95 is fixedly disposed on the squeeze plate 93. Between the pressure plate 93 and the inner wall of the box body 81, a one-way air outlet hole 96 is opened on the side wall of the box body 81 at the inner side of the elastic air bag cover 95, and the one-way air outlet hole 96 is communicated with the air supply groove 82. A one-way air replenishment hole 97 is opened on the side wall of the box body 81 at the inner side of the elastic air bag cover 95, and one-way valves 98 are installed inside the one-way air replenishment hole 97 and the one-way air outlet hole 96. Rubber pads are provided on both side walls of the push block 91 to prevent noise during squeezing and collision.

[0022] The tail ends of the two secondary longitudinal beams 2 are both provided with exhaust holes 10 , and the two exhaust pipes 86 are both connected to the inside of the exhaust holes 10 on the same side. The exhaust holes 10 can facilitate the exhaust of the heat dissipation airflow.

[0023] A vent hole 11 is provided inside each cross beam 6, and a round hole 12 connected to the exhaust hole 10 is provided on the side wall of each vent hole 11. An inflation tube 13 is provided on one side of the notch of the exhaust hole 10 of the two secondary longitudinal beams 2, and the two inflation tubes 13 are fixedly plugged into the side wall of the straight portion 4 of the special-shaped outer edge longitudinal beam 3 on the same side. The two inflation tubes 13 are connected to the exhaust hole 10 on the same side. An air pressure detection tube 14 is fixedly plugged into the tube wall of the two inflation tubes 13. The air pressure detection tube 14 can be installed with a detector for detecting air pressure. The inner walls of the exhaust hole 10, the vent hole 11, the round hole 12, etc. are coated with a noise reduction coating and an anti-rust coating.

[0024] The side walls of the two special-shaped outer edge longitudinal beams 3 include a rear wheel section 15 and a front wheel section 16. The side walls of the two rear wheel sections 15 are fixedly connected to the side walls of the secondary longitudinal beam 2 on the same side. The side walls of the two front wheel sections 16 are fixedly connected to the side walls of the secondary longitudinal beam 2 on the same side by connecting columns 17. The connection between the rear wheel section 15 and the secondary longitudinal beam 2 is fully welded. The connecting column 17 can improve the connection strength between the front wheel section 16 and the secondary longitudinal beam 2.

[0025] Both ends of the side walls of the main longitudinal beam 1 are plugged with fixing pins 18 , and the fixing pins 18 pass through the side walls of the two plug-in parts 52 on the same side. The fixing pins 18 can improve the connection stability between the main longitudinal beam 1 and the plug-in parts 52 .

[0026] The operating principle of the present invention is now described as follows: when assembling the frame, the two secondary longitudinal beams 2 are installed to the two sides of the main longitudinal beam 1 through the mold frame, and then each cross beam 6 is inserted through the secondary longitudinal beam 2 and the main longitudinal beam 1 in turn, and the position accuracy of the cross beam 6, the main longitudinal beam 1 and the secondary longitudinal beam 2 is determined by the mold frame, and then the two special-shaped outer edge longitudinal beams 3 are clamped on the outer side of each cross beam 6 from top to bottom to form the outer edge of the frame, and the two plug-in parts 52 are inserted into the U-shaped card groove 51, and then the plug-in part 52 is fixed to the main longitudinal beam 1 by the fixing pin 18, and then the cross beam 6 is welded. The beam 6 is welded and fixed to each connection point with the main longitudinal beam 1 and the secondary longitudinal beam 2, the connection point with the secondary longitudinal beam 2 and the special-shaped outer edge longitudinal beam 3, and the connection position between the main longitudinal beam 1 and the two plug-in parts 52, wherein the connection between the ends of the two secondary longitudinal beams 2 and the side walls of the special-shaped outer edge longitudinal beam 3 also needs to be reinforced and connected by bolts and other structures. Finally, the battery compartment bottom cover 7 is welded and fixed to the middle position of the end face of the frame, so that each box body 81 is located between adjacent cross beams 6 (the battery compartment bottom cover 7 is used to support the battery unit of the new energy vehicle, and a fixing frame for fixing the battery unit and other structures can be installed thereon); When the vehicle using the frame is in motion, due to the inertia caused by the braking and acceleration of the vehicle, the pushing block 91 will move to one side of the box body 81. When the pushing block 91 moves, it will push the squeezing plate 93 on one side to move. The squeezing plate 93 starts to move under the squeezing effect, thereby squeezing the air inside the elastic airbag cover 95 on the same side. Under the action of the one-way valve 98, the air inside the elastic airbag cover 95 on the same side will be discharged into the air supply groove 82 through the one-way air outlet 96. When the inertia disappears, under the action of the spring 94, the squeezing plate 93 will drive the elastic airbag cover 95 to move back and reset. Under the action of the internal and external pressure difference, the external air is supplemented into the elastic airbag cover 95 through the one-way air replenishing hole 97, and the air entering the air supply groove 82 will enter the interior of the ipsilateral transverse cavity 83 through the air inlet hole 84, and pass through the connecting hole 85 and the exhaust hole 87, and finally be discharged through the air outlet pipe 86. Since the airflow flows inside the battery compartment bottom cover 7, the heat dissipation of the battery compartment bottom cover 7 can be accelerated. The heat of the battery compartment bottom cover 7 is conducted, and the battery compartment bottom cover 7 can conduct the heat of the battery unit installed thereon, thereby indirectly assisting the heat dissipation and cooling of the battery unit. The air discharged through the exhaust pipe 86 will enter the tail hole 10 and be discharged through the notch of the tail hole 10. Through the provided heat dissipation unit 8, the dynamic inertia force of the vehicle during driving (such as acceleration, deceleration and other working conditions) can be used to drive the air flow circulation to form a passive heat dissipation assistance. Through the two-way dynamic response mechanism of the air supply component 9, air flow disturbance is continuously generated during the movement of the vehicle, and the heat of the battery compartment bottom cover 7 is discharged through the transverse cavity 83 and the exhaust pipe 86. Compared with the traditional active heat dissipation system, no additional energy consumption is required, and the heat dissipation efficiency can be significantly improved under complex working conditions such as frequent start and stop. At the same time, the heat dissipation structure is integrated with the battery compartment bottom cover 7, which can be used as a supplement to the main heat dissipation systems such as liquid cooling and air cooling to form a multi-level heat dissipation network, which effectively reduces the working temperature fluctuation of the battery unit and prolongs the battery life. After the frame welding is completed, the air supply end of the external air supply equipment (such as an air pump) is connected to the air filling pipe 13, and the external air pressure detector for detecting the air pressure is installed in the air pressure detection pipe 14, and then the air is filled into the air filling pipe 13 through the external air supply equipment. The gas will enter each vent hole 11 through the air filling pipe 13, the tail hole 10, and the round hole 12. When the air pressure in the air filling pipe 13 is detected to rise to 1.5 atmospheres through the air pressure detection tube 14, the external air supply equipment is turned off, and the air supply end of the air supply equipment is sealed by a valve and other structures, and then wait for 10 minutes to check whether the air pressure displayed by the air pressure detector is If the pressure drops or not, it can be known whether there are welding defects at each welding position of the cross beam 6 and the auxiliary longitudinal beam 2. In the subsequent vehicle maintenance, this method can also be used to detect whether there are cracks and other phenomena at the welding positions of the frame to ensure the structural stability of the frame and to promptly discover defects that affect the stability of the frame (wherein, the diameters of the exhaust hole 10 and the air hole 11 are 0.8 mm, and the diameter of the round hole 12 is 1.2 mm. Secondly, a hole with a diameter of 0.8 mm is also opened inside the main longitudinal beam 1, and the hole is also connected to the air hole 11 of the cross beam 6 to ensure the comprehensiveness of the detection of each weld. The material of the frame is 6061 aluminum alloy).

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined longitudinal beam type integrated aluminum alloy vehicle frame, comprising a main longitudinal beam (1) and two secondary longitudinal beams (2) arranged on both sides of the main longitudinal beam (1), characterized in that: Also includes: Two special-shaped outer edge longitudinal beams (3) are arranged on both sides of the main longitudinal beam (1), and two secondary longitudinal beams (2) are arranged between the two special-shaped outer edge longitudinal beams (3), both ends of the two special-shaped outer edge longitudinal beams (3) are integrally bent to form a straight portion (4), and both ends of the two secondary longitudinal beams (2) are fixedly connected to the two straight portions (4) of the special-shaped outer edge longitudinal beam (3) on the same side; A connecting assembly (5) is arranged at both ends of the main longitudinal beam (1), and the main longitudinal beam (1) is connected to the two special-shaped outer edge longitudinal beams (3) via the connecting assembly (5); A plurality of cross beams (6), each of which is arranged between the two special-shaped outer edge longitudinal beams (3), and each cross beam (6) is fixedly plugged into the side walls of the main longitudinal beam (1) and the secondary longitudinal beam (2); The battery compartment bottom cover (7) is installed at the middle position of the top of the main longitudinal beam (1), and the tops of the two secondary longitudinal beams (2) and the special-shaped outer edge longitudinal beam (3) are fixedly connected to the bottom of the battery compartment bottom cover (7), and the battery compartment bottom cover (7) is installed with a heat dissipation unit (8).

2. The combined longitudinal beam integrated aluminum alloy frame according to claim 1, characterized in that: The connection assembly (5) comprises U-shaped slots (51) provided at both ends of the main longitudinal beam (1), both ends of the special-shaped outer edge longitudinal beam (3) are integrally bent to form plug-in portions (52), and two plug-in portions (52) located on the same side of the two special-shaped outer edge longitudinal beams (3) are pressed against each other, the two plug-in portions (52) on the same side are both plug-in-connected inside the U-shaped slots (51) on the same side, and the two plug-in portions (52) on the same side are welded and fixed to the main longitudinal beam (1).

3. The combined longitudinal beam integrated aluminum alloy frame according to claim 1, characterized in that: The heat dissipation unit (8) comprises a plurality of boxes (81) fixedly mounted on the battery compartment bottom cover (7), and each box (81) is respectively arranged between two cross beams (6) on the same side, and both sides of the end surface of each box (81) are provided with air supply grooves (82), and each box (81) is provided with an air supply assembly (9), and a plurality of transverse cavities (83) are provided inside the battery compartment bottom cover (7), and a lower cavity wall of each transverse cavity (83) is provided with an air inlet hole (84), and each air inlet hole (84) is connected to the corresponding air supply groove (82), and the cavity walls of two adjacent transverse cavities (83) are provided with a plurality of connecting holes (85), and the side wall of the battery compartment bottom cover (7) is fixedly connected with two air outlet pipes (86), and the transverse cavity (83) on the same side as the air outlet pipe (86) is provided with two exhaust holes (87) connected to the air outlet pipe (86).

4. The combined longitudinal beam integrated aluminum alloy frame according to claim 3, characterized in that: The air supply assembly (9) comprises a push block (91) arranged inside the box body (81), and sliding blocks (92) are installed at the upper and lower ends of the push block (91), and the push block (91) is slidably arranged inside the box body (81) through the sliding blocks (92), and the positions inside the box body (81) located on both sides of the push block (91) are slidably connected with extrusion plates (93), and springs (94) are arranged between the two extrusion plates (93) and the inner wall of the box body (81), and the outer side of the spring (94) is provided with an elastic gas sleeve. The airbag sleeve (95) is fixedly arranged between the extrusion plate (93) and the inner wall of the box body (81); a one-way air outlet hole (96) is provided on the side wall of the box body (81) at a position inside the elastic airbag sleeve (95); the one-way air outlet hole (96) is communicated with the air supply groove (82); a one-way air replenishment hole (97) is provided on the side wall of the box body (81) at a position inside the elastic airbag sleeve (95); and one-way valves (98) are installed inside the one-way air replenishment hole (97) and the one-way air outlet hole (96).

5. The combined longitudinal beam integrated aluminum alloy frame according to claim 3, characterized in that: The tail ends of the two secondary longitudinal beams (2) are each provided with an exhaust hole (10), and the two exhaust pipes (86) are both connected to the interior of the exhaust hole (10) on the same side.

6. The combined longitudinal beam integrated aluminum alloy frame according to claim 5, characterized in that: Each of the cross beams (6) is provided with a vent hole (11) inside, and a side wall of each vent hole (11) is provided with a circular hole (12) connected to the exhaust hole (10). The two secondary longitudinal beams (2) are provided with an air charging tube (13) on one side of the notch of the exhaust hole (10), and the two air charging tubes (13) are fixedly plugged into the side wall of the straight portion (4) of the special-shaped outer edge longitudinal beam (3) on the same side. The two air charging tubes (13) are connected to the exhaust hole (10) on the same side, and an air pressure detection tube (14) is fixedly plugged into the tube wall of the two air charging tubes (13).

7. The combined longitudinal beam integrated aluminum alloy frame according to claim 1, characterized in that: The side walls of the two special-shaped outer edge longitudinal beams (3) include a rear wheel section (15) and a front wheel section (16); the side walls of the two rear wheel sections (15) are fixedly connected to the side walls of the secondary longitudinal beam (2) on the same side; and connecting columns (17) are fixedly connected between the side walls of the two front wheel sections (16) and the side walls of the secondary longitudinal beam (2) on the same side.

8. The combined longitudinal beam integrated aluminum alloy frame according to claim 2, characterized in that: Both ends of the side wall of the main longitudinal beam (1) are plugged with fixing pins (18), and the fixing pins (18) pass through the side walls of two plug-in parts (52) on the same side.

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