Vehicle assembling method, device and three-section bearing type off-road vehicle production line

Abstract

The application discloses a vehicle assembling method and device, an off-road vehicle and an assembling production line thereof. The method comprises the following steps: base platform operation, front section subassembly assembling, rear section subassembly assembling, middle section subassembly assembling, finally fixing the middle section vehicle body assembly with the front section subassembly and the rear section subassembly, and realizing the assembling of the whole vehicle. The vehicle assembling device comprises a base platform, a middle lifting module is installed in the middle of the base platform, a front end positioning module and a front end adjusting module are arranged on one side of the middle lifting module, and a rear end positioning module and a rear end adjusting module are arranged on the other side of the middle lifting module. The three-section off-road vehicle assembling and adjusting method based on the multi-direction adjustable whole vehicle assembling clamp provided by the application uses the multi-direction adjusting mechanism device to realize the three-section subassembly and assembling, effectively improves the assembling and adjusting efficiency and quality of the key working procedure of the product, and improves the safety and consistency of the assembling process.

Description

Technical Field

[0001] This invention relates to a vehicle assembly and adjustment method, apparatus, and production line, and more particularly to a vehicle assembly and adjustment method, apparatus, and a three-section load-bearing off-road vehicle production line. Background Technology

[0002] In the practice of vehicle production and manufacturing, a certain type of off-road vehicle adopts a three-section load-bearing body structure, uses a range-extended hybrid power drive mode, and is equipped with off-road performance configurations such as oil and gas springs. The overall structure of this vehicle is complex, and the gaps between various assemblies and parts are narrow. During the assembly process, interference or even collision damage is very likely to occur, leading to serious quality problems. Therefore, it is of great significance to study its efficient, fast and safe three-section off-road vehicle assembly and adjustment method.

[0003] Currently, similar three-section off-road vehicles, both domestically and internationally, mostly rely on manual adjustments during the trial and production processes. This results in poor product assembly consistency and an inability to guarantee quality. The front module of this type of off-road vehicle is connected to multiple mounting points on the vehicle's floor and front bulkhead, while the rear module is connected to multiple mounting points on the vehicle's floor and rear bulkhead. This involves the coordination of multiple spatial dimensions. The assembly and adjustment of the front module, body, and rear module assembly is the most challenging aspect of this type of off-road vehicle and requires focused research and development.

[0004] Three-section monocoque off-road vehicles employ different assembly and adjustment procedures depending on their structural layout. The main challenge lies in ensuring consistent positioning across the three sections to effectively connect them. Referring to domestic and international materials, similar off-road vehicles often use a body assembly hoisting method, with each component connected separately to the body. However, due to space constraints and installation dimensions, assembly tolerances often accumulate, preventing effective connection of the three assemblies. Furthermore, hoisting operations can cause assembly misalignment and dimensional deviations during assembly and adjustment, requiring repeated adjustments. This makes the operation extremely complex and poses significant safety risks. Summary of the Invention

[0005] The purpose of this invention is to provide a vehicle assembly and adjustment method, device, and three-section load-bearing off-road vehicle production line. Based on a three-section off-road vehicle assembly and adjustment method using a multi-directional adjustable vehicle assembly fixture, the invention utilizes a device with a multi-directional adjustment mechanism to achieve the assembly and disassembly of the three sections, thus overcoming the shortcomings of the existing technology.

[0006] This invention provides the following solution:

[0007] A vehicle assembly and adjustment method, comprising:

[0008] Base platform operation: Perform leveling operation on base platform 31 to set the initial state of the equipment;

[0009] Front section sub-assembly assembly 21 installation and adjustment: The front electric drive axle assembly is installed onto the front adjustment module 33. The front adjustment module 33 is controlled to position the front electric drive axle assembly. The front positioning module 32 is controlled to position the front frame through pin positioning and clamping positioning.

[0010] The front adjustment module 33 is moved to the front positioning module 32 to connect the front electric drive axle assembly and the front frame, the engine assembly is installed and connected to the engine mount, the front crossbeam is installed, and the assembly and adjustment of the front sub-assembly assembly 21 is completed.

[0011] Rear assembly 23 assembly and adjustment: The rear positioning module 35 positions the left and right triangular beam assemblies by pin positioning and connects the triangular beam assemblies to the left and right longitudinal beams. The rear electric drive axle assembly is mounted on the rear adjustment module 36, which controls the rear adjustment module 36 to connect the rear electric drive axle assembly to the left and right triangular beams.

[0012] Mid-section sub-assembly assembly 22: The mid-section body assembly is raised and lowered by a hydraulic lifting device to complete the positioning of the mid-section body assembly, and then fixedly connected to the front and rear sub-assembly assemblies to achieve the assembly and adjustment of the whole vehicle.

[0013] Furthermore, during the assembly and adjustment process of the front-end sub-assembly, the following steps are further included: positioning the front electric drive axle assembly by controlling the front-end adjustment module 33 to perform translation, lifting, or rotation; pin positioning function by controlling the positioning pin of the front-end positioning module 32, wherein the positioning pin is used to position the left and right longitudinal beams of the front frame; and clamping positioning function by controlling the clamping positioning seat of the front-end positioning module, wherein the clamping positioning seat includes a first front clamping positioning seat 321 and a second front clamping positioning seat 323, wherein the first and second front clamping positioning seats are respectively used to clamp the left and right longitudinal beams of the front frame.

[0014] Furthermore, during the assembly and adjustment of the rear sub-assembly, the rear positioning module 35 positions the left and right triangular beam assemblies through the rear positioning pin 351 and the rear positioning pin seat 354, connects the left and right triangular beam assemblies to the left and right rear longitudinal beams, installs the bottom protective bracket, controls the rear adjustment module 36 to connect the rear electric drive axle assembly to the left and right triangular beam assemblies, assembles the rear frame front crossbeam and the rear frame rear crossbeam, and completes the assembly and adjustment of the rear sub-assembly.

[0015] Furthermore, after installing the bottom protective bracket, place a connecting block on the connector support of the rear positioning module, and use bolts to connect the connecting block, the bottom protective bracket, and the left and right triangular beam assemblies in sequence.

[0016] Furthermore, during the assembly and adjustment of the mid-section sub-assembly, the upper surface of the support block 344 of the mid-section lifting module 34 is raised, so that the upper surface of the support block 344 is higher than the front positioning pin 324 and the rear positioning pin 351 of the front positioning module 32. The mid-section body assembly is hoisted and positioned. The support block 344 is lowered, so that the positioning holes of the mid-section body assembly fall into the front positioning pin 324 and the rear positioning pin 351 respectively, thus completing the positioning of the mid-section body assembly.

[0017] Furthermore, during the hoisting of the mid-section body assembly, the front limiting block 345 and the side limiting block 342 are used to position the mid-section body assembly in the X and Y directions, respectively.

[0018] A vehicle assembly and adjustment system for implementing the aforementioned vehicle assembly and adjustment method includes:

[0019] The base platform operation unit is used to perform leveling operations on the base platform and set the initial state of the equipment.

[0020] The front sub-assembly assembly adjustment unit is used to install the front electric drive axle assembly onto the front adjustment module 33. The front adjustment module 33 is controlled to position the front electric drive axle assembly, and the front positioning module 32 is controlled to position the front frame through pin positioning and clamping positioning.

[0021] The front-end adjustment module 33 is moved to the front-end positioning module 32 to connect the front electric drive axle assembly and the front frame, the engine assembly is installed and connected to the engine mount, the front crossbeam is installed, and the assembly and adjustment of the front sub-assembly assembly is completed.

[0022] The rear sub-assembly assembly adjustment unit is used by the rear positioning module 35 to position the left and right triangular beam assemblies by means of pin positioning, and to connect the triangular beam assemblies with the left and right longitudinal beams. The rear electric drive axle assembly is mounted on the rear adjustment module 36, and the rear adjustment module 36 is controlled to connect the rear electric drive axle assembly with the left and right triangular beams.

[0023] The mid-section sub-assembly assembly adjustment unit is used to lift and lower the mid-section body assembly through a hydraulic lifting device, complete the positioning of the mid-section body assembly, and fix the mid-section body assembly to the front and rear sub-assembly assemblies to achieve the overall vehicle assembly adjustment.

[0024] A vehicle assembly and adjustment device includes a base platform 31, a central lifting module 34 installed in the middle of the base platform 31, a front positioning module 32 and a front adjustment module 33 arranged on one side of the central lifting module 34, and a rear positioning module 35 and a rear adjustment module 36 arranged on the other side of the central lifting module 34. The front positioning module 32 and the front adjustment module 33 are used for assembling and adjusting the front sub-assembly assembly 21, and the front positioning module 32 and the front adjustment module 33 are used for assembling and adjusting the rear sub-assembly assembly 23. The central lifting module 34 is used to fix the central sub-assembly assembly 22 to the front sub-assembly assembly 21 and the rear sub-assembly assembly 23 to realize the assembly and adjustment of the whole vehicle.

[0025] Furthermore, the front-end positioning module 32 is installed on one side of the upper surface of the base platform plate 3111. A front limiting block 3119 and a rear limiting block 3122 are installed on both sides of the front-end positioning module 32. A front sliding platform 3121 is installed between the front and rear limiting blocks. A front longitudinal guide rail 3118 and a front transverse guide rail 3117 are provided below the front sliding platform 3121. The front sliding platform 3121 is slidably connected to the front longitudinal and transverse guide rails. A first front clamping positioning seat 321, a first front positioning pin 322, a second front clamping positioning seat 323, and a second front positioning pin 324 are fixedly connected on the base platform plate 3111 of the base platform 31. The first front clamping positioning seat 322 and the second front positioning pin 324 are used to position the left and right longitudinal beams of the front frame, respectively. The first front clamping positioning seat 321 and the second front clamping positioning seat 323 are used to clamp the left and right longitudinal beams of the front frame.

[0026] Furthermore, the front adjustment module 33 is installed on the front transverse guide rail 3117 of the base platform 31. The front adjustment module 33 includes: a front transverse moving platform 331, a front rotating platform 332, a lifting support 333, a front rotating gear shaft 334, a front transverse adjustment handwheel 335, a front rotating mechanism reducer 336, a lifting adjustment handwheel 337, and an electric drive axle suspension positioning module 338. The front transverse moving platform 331 and the front rotating platform 332 are stacked sequentially. The front rotating gear shaft 334 is installed in the middle of the front rotating platform 332. The rotating gear shaft is connected to the front rotating mechanism reducer 336. The lifting support 333 and the electric drive axle suspension positioning module 338 are installed on the upper surface of the front rotating platform 332. The electric drive axle suspension positioning module 338 is used to position the mounting holes of the electric drive axle suspension through positioning pins.

[0027] Furthermore, the rear positioning module 35 is installed on the base platform plate 3111 of the base platform 31. The rear positioning module 35 includes: a rear positioning pin 351, a connector support 352, a lower protective bracket support 353, a rear positioning pin seat 354, and a longitudinal beam support 355. The connector support 352 and the longitudinal beam support 355 are fixedly installed on the base platform 31. The rear positioning pin 351 can move in the vertical direction. The movement of the rear positioning pin 351 achieves positioning with the front positioning holes of the left and right triangular beam assemblies.

[0028] The rear positioning pin seat 354 and the longitudinal beam support seat 355 are used to place the left and right longitudinal beams. The rear positioning pin seat 354 is slidably installed on the slide rail. The positioning pin causes the rear positioning pin seat 354 to slide to the positioning point and insert the positioning pin, thereby realizing the positioning of the left and right triangular beam assemblies.

[0029] Furthermore, the rear adjustment module 36 is installed on the upper surface of the rear transverse guide rail 3115 of the base platform 31 on the other side relative to the front positioning module 32. A rear longitudinal guide rail 3112 is provided on the base platform plate 3111, and a rear sliding platform 3113 is slidably connected on the rear longitudinal guide rail. A rear transverse guide rail 3115 is installed on the upper side of the rear sliding platform 3113. The rear transverse guide rail 3115 is arranged perpendicularly to the rear longitudinal guide rail 3112.

[0030] Furthermore, the rear adjustment module 36 includes a rear lateral moving platform 361, a rear rotating platform 362, a lifting support 363, a rear rotating gear shaft 364, a rear lateral adjustment handwheel 365, a rotating mechanism reducer 366, and a lifting adjustment handwheel 367. The rear lateral moving platform 361 is slidably connected to the rear lateral guide rail 3115. The rear rotating platform 362 is installed on the upper side of the rear lateral moving platform 361. The lifting support 363 is installed on the upper surface of the rear rotating platform 362. The rear rotating gear shaft 364 is installed in the middle of the rear rotating platform 362. The rear rotating gear shaft 364 is connected to a rear rotating mechanism reducer 366.

[0031] Furthermore, the central lifting module 34 includes a hydraulic lifting cylinder 341, a lateral limiting block 342, a support platform 343, a support block 344, a front limiting block 345, and a lifting handwheel 346. The hydraulic lifting cylinder 341 is installed at the bottom of the support platform 343, and the support block 344 is installed on both sides of the support platform 343. The lateral limiting block 342 and the front limiting block 345 are installed around the support block 344.

[0032] A vehicle assembly and adjustment production line includes the vehicle assembly and adjustment device and executes the vehicle assembly and adjustment method based on the vehicle assembly and adjustment system.

[0033] A three-section load-bearing off-road vehicle assembly and adjustment production line is provided for the assembly and adjustment production of off-road vehicles based on the aforementioned vehicle assembly and adjustment production line.

[0034] An off-road vehicle, said off-road vehicle being manufactured by the aforementioned three-section load-bearing off-road vehicle assembly and adjustment production line.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] This invention provides a three-section off-road vehicle assembly and adjustment method based on a multi-directional adjustable vehicle assembly fixture. The method uses a device with a multi-directional adjustment mechanism to achieve the assembly and reassembly of the three sections, effectively improving the assembly and adjustment efficiency and quality of key processes, and enhancing the safety and consistency of the assembly and adjustment process.

[0037] This invention adopts a modular assembly and positioning structure, enabling complex multi-stage assembly processes to be positioned and assembled using the same tooling. This unifies the assembly and positioning benchmark, reduces transfer time and safety risks, and improves efficiency. It employs a double-layer guide rail, hydraulic lifting device, and gear rotation structure controlled by a reducer, allowing the device to be adjusted in four directions: X, Y, Z, and Z-axis. This allows for appropriate adjustments based on changes in the size, position, and fit of the workpiece.

[0038] This invention employs a modular three-way adjustable structure with adjustment shims, which can adjust the positioning position for potential new product structures to meet the positioning needs of multiple products; it adopts a modular assembly process method, which decomposes the complex vehicle assembly process into multiple sub-modules, achieves unified benchmarks for major components, and ensures product quality. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 This is a flowchart of the vehicle assembly and adjustment method.

[0041] Figure 2 This is the architecture diagram of the vehicle assembly and adjustment system.

[0042] Figure 3 This is a schematic diagram illustrating the principle of vehicle assembly and adjustment methods.

[0043] Figure 3a This is an overall structural diagram of the vehicle assembly and adjustment device.

[0044] Figure 4This is a structural diagram of the base platform.

[0045] Figure 5 This is a structural diagram of the front-end positioning module.

[0046] Figure 6 This is a structural diagram of the front-end adjustment module.

[0047] Figure 6a This is a structural diagram of the front-end adjustment module from another perspective.

[0048] Figure 7 This is a structural diagram of the central lifting module.

[0049] Figure 8 This is a structural diagram of the backend positioning module.

[0050] Figure 9 This is a structural diagram of the backend adjustment module. Detailed Implementation

[0051] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] like Figure 1 The vehicle assembly and adjustment method shown includes:

[0053] Step S1, Base Platform Operation: Perform a leveling operation on the base platform 31 to adjust it to a horizontal state, and set the initial state of the assembly and adjustment equipment to restore each assembly and adjustment equipment to its initial state. That is, perform a reset or restore operation on the assembly and adjustment equipment participating in the vehicle assembly and adjustment method to return it to its initial state.

[0054] Step S2, front sub-assembly assembly 21 installation and adjustment: the front electric drive axle assembly is installed onto the front adjustment module 33, the front adjustment module 33 is controlled to position the front electric drive axle assembly, and the front positioning module 32 is controlled to position the front frame through pin positioning and clamping positioning.

[0055] The front-end adjustment module 33 is moved to the front-end positioning module 32 to connect the front electric drive axle assembly and the front frame, the engine assembly is installed and connected to the engine mount, the front crossbeam is installed, and the assembly and adjustment of the front sub-assembly assembly is completed.

[0056] Preferably, during the assembly and adjustment of the front sub-assembly 21, the positioning of the front electric drive axle assembly is achieved by controlling the front adjustment module 33 to perform translation, lifting, or rotation. The positioning function is achieved by controlling the positioning pin of the front positioning module 32. The positioning pin is used to position the left and right longitudinal beams of the front frame, and push-pull pins are used to facilitate assembly and disassembly. The clamping positioning function is achieved by controlling the clamping positioning seat of the front positioning module. The clamping positioning seat includes a first front clamping positioning seat 321 and a second front clamping positioning seat 323. The first and second front clamping positioning seats are used to clamp the left and right longitudinal beams of the front frame, respectively, to achieve the clamping positioning of the left and right longitudinal beams of the front frame.

[0057] For example, during the assembly and adjustment of the front-end sub-assembly, the front longitudinal adjustment handwheel 3120 is rotated to slide the front sliding platform 3121, the front transverse guide rail 3117, and the front adjustment module 33 along the front longitudinal guide rail 3118 to the front limit block 3119. The front electric drive axle assembly is then placed onto the front adjustment module 33, and the lower surface of the motor and the lower end face of the main reducer are respectively placed onto the three lifting support seats 333. The lifting adjustment handwheel 337 is cranked to adjust the height of the electric drive axle assembly, the front transverse adjustment handwheel 335 is cranked to adjust the transverse position of the electric drive axle, and the front rotating mechanism reducer 336 is cranked to drive the front rotating gear shaft 334, causing the platform to rotate along the Z-axis. The electric drive axle suspension positioning module 338 slides along the guide rail to position its positioning pin in the electric drive axle suspension mounting hole, achieving precise positioning. At this point, the positioning of the front electric drive axle assembly is completed.

[0058] The left and right longitudinal beams of the front frame are positioned using two front positioning pins 322 and 324 on each side, respectively, and push-pull pins facilitate assembly and disassembly. The left and right longitudinal beams of the front frame are clamped using two first front clamping positioning seats 321 and two second front clamping positioning seats 323 on each side, respectively, to achieve clamping and positioning of the left and right longitudinal beams of the front frame. Based on the left and right longitudinal beams of the front frame, the rear crossbeam of the front frame is installed: the front longitudinal adjustment handwheel 3120 is turned to slide the front sliding platform 3121, the front transverse guide rail 3117, the front adjustment module 33, and the clamped front electric drive axle assembly along the front longitudinal guide rail 3118 to the rear limit block 3122, locking the rear electric drive axle suspension positioning module 338 positioning pin, pulling it out along the guide rail, installing the electric drive axle suspension, and connecting the front electric drive axle assembly to the frame longitudinal beam. The engine assembly is then installed, the engine mount is connected, and the front crossbeam is installed—thus, the front sub-assembly assembly 21 is completed.

[0059] As can be seen, this embodiment describes the assembly and adjustment process of the front-end sub-assembly 21. By using the front-end positioning module 32 and the front-end adjustment module 33 in conjunction, the front-end sub-assembly 21 can be positioned and adjusted.

[0060] Step S3, rear sub-assembly assembly 23 assembly and adjustment: The rear positioning module 35 positions the left and right triangular beam assemblies by pin positioning and connects the triangular beam assemblies to the left and right longitudinal beams. The rear electric drive axle assembly is mounted on the rear adjustment module 36 and the electric drive axle mount is installed. The rear adjustment module 36 is controlled to connect the rear electric drive axle assembly to the left and right triangular beams. After the rear electric drive axle assembly is connected to the left and right triangular beams, the rear frame front crossbeam, the rear frame rear crossbeam, etc. are then assembled.

[0061] Preferably, during the assembly and adjustment of the rear sub-assembly, the rear positioning module 35 positions the left and right triangular beam assemblies through the rear positioning pin 351 and the rear positioning pin seat 354, connects the left and right triangular beam assemblies to the left and right rear longitudinal beams, installs the bottom protective bracket, controls the rear adjustment module 36 to connect the rear electric drive axle assembly to the left and right triangular beam assemblies, assembles the rear frame front crossbeam and the rear frame rear crossbeam, and completes the assembly and adjustment of the rear sub-assembly.

[0062] For example, the left and right triangular beams are placed on the support positioning blocks of the rear positioning pin 351 and the rear positioning pin seat 354. The rear positioning pin 351 is pushed to position the front positioning holes of the left and right triangular beam assemblies. The rear positioning pin seat 354 slides along its own guide rail to the positioning point and inserts the positioning pin to realize the positioning of the left and right triangular beam assemblies.

[0063] For example, after installing the bottom protective bracket, a connecting block is placed on the connector support of the rear positioning module, and bolts are used to connect the connecting block, the bottom protective bracket and the left and right triangular beam assemblies in sequence.

[0064] For example, during the assembly and adjustment of the rear sub-assembly 23, the rear positioning pin 351 is slid to the bottom, and the rear positioning pin seat 354 is slid to the side limit position. The left and right triangular beams are placed on the rear positioning pin 351 and the rear positioning pin seat 354 support positioning block. The rear positioning pin 351 is pushed to position the front positioning holes of the left and right triangular beam assemblies. The positioning module of the rear positioning pin seat 354 slides along its own guide rail to the positioning point and inserts the positioning pin to achieve positioning of the left and right triangular beam assemblies.

[0065] Place the left and right rear longitudinal beams of the frame on the rear positioning pin seat 354 to support the positioning block and the longitudinal beam support seat 355. The left and right triangular beams are bolted to the left and right rear longitudinal beams respectively. Place the connecting block on the connecting support seat 352 and the bottom protective bracket on the lower protective bracket support seat 353. Use bolts to connect the connecting block, the bottom protective bracket and the left and right triangular beams in sequence.

[0066] The rear electric drive axle assembly is mounted onto the rear adjustment module 36. The lower surface of the motor and the lower end face of the main reducer (main reducer) are respectively mounted onto three lifting support seats 363. The lifting adjustment handwheel 367 is turned to adjust the Z-axis position of the electric drive axle assembly. The lateral adjustment handwheel 365 is turned to adjust the Y-axis position of the electric drive axle. The rotary mechanism reducer 366 is turned to drive the rear rotary gear shaft 364, which drives the platform to rotate along the Z-axis. The longitudinal adjustment handwheel 3114 is turned to adjust the X-axis position of the rear electric drive axle. Through multi-directional adjustment, the rear electric drive axle mount is installed, connecting the rear electric drive axle assembly to the left and right triangular beams. The rear frame front crossbeam, rear frame rear crossbeam, etc. are assembled, and the rear sub-assembly assembly 23 is completed.

[0067] As can be seen from this embodiment, the rear positioning module 35 is used to install and adjust the triangular beam, longitudinal beam, bottom protective bracket, etc. of the rear sub-assembly assembly, and the rear adjustment module 36 is used for the installation and adjustment of the rear electric drive axle assembly. Through the cooperation between the rear positioning module 35 and the rear adjustment module 36, the installation and adjustment of the rear sub-assembly assembly can be completed.

[0068] Preferably, during the assembly and adjustment of the rear sub-assembly, the rear positioning module 35 positions the left and right triangular beam assemblies through the rear positioning pin 351 and the rear positioning pin seat 354, connects the left and right triangular beam assemblies to the left and right rear longitudinal beams, and installs the bottom protective bracket. Then, through a connecting block, bolts are used to connect the connecting block, the bottom protective bracket and the left and right triangular beams in sequence. The rear adjustment module 36 is controlled to connect the rear electric drive axle assembly to the left and right triangular beam assemblies, assemble the rear frame front crossbeam and the rear frame rear crossbeam, and complete the assembly and adjustment of the rear sub-assembly.

[0069] Step S4, Mid-section sub-assembly assembly 22: The mid-section body assembly is raised and lowered by a hydraulic lifting device to complete the positioning of the mid-section body assembly, and the mid-section body assembly is fixedly connected to the front sub-assembly assembly and the rear sub-assembly assembly to realize the assembly and adjustment of the whole vehicle.

[0070] For example, when hoisting the mid-section body assembly, the front limiting block 345 and the side limiting block 342 are used to position the mid-section body assembly in the X and Y directions, respectively.

[0071] This embodiment describes the three-section assembly connection and adjustment method through steps S1 to S4: The lifting handwheel 346 of the middle lifting module 34 is cranked to a high position. This high position raises the upper surface of the support block 344 by approximately 10mm above the upper surfaces of the front positioning pin 324 and the rear positioning pin 351. The middle body assembly is then hoisted. The front limiting block 345 and the side limiting block 342 are used to position the middle body assembly in the X and Y directions, respectively. The lifting handwheel 346 is cranked to slowly lower the body assembly, causing the body positioning holes to fall into the front positioning pin 324 and the rear positioning pin 351, thus completing the positioning of the middle body assembly. At this point, bolts are inserted and pre-tightened through the lower mounting holes at the rear end of the front sub-assembly assembly 21 and the front end of the rear sub-assembly assembly 23, achieving the three-section load-bearing vehicle assembly and adjustment.

[0072] The assembly and adjustment method of the three-section monocoque off-road vehicle in this embodiment can be summarized as follows: First, the front-end module assembly is disassembled → the front-end adjustment module is slid to the front limit point → the front electric drive axle is installed onto the front-end adjustment module fixture → the front frame longitudinal beam is installed and positioned → the front electric drive axle slides with the adjustment module to the rear limit point → the front adjustment module is adjusted → the electric drive axle mount is installed → the engine is installed → the front crossbeam is installed → the front sub-assembly assembly is completed → the rear-end module assembly is disassembled → the left and right triangular beams, protective brackets, etc., are installed → the rear electric drive axle is installed onto the rear-end adjustment module fixture → the rear frame longitudinal beam is installed and positioned → the rear adjustment module fixture is adjusted → the electric drive axle mount is installed → the large bracket is adjusted and installed → the rear crossbeam is installed → the rear sub-assembly assembly is completed → the body assembly is disassembled → the front and rear ends of the body assembly are respectively assembled and connected to the front and rear sub-assembly assemblies → the three-section monocoque vehicle is connected → the suspension, wheel rims, wheels, etc. are installed → the vehicle is hoisted onto the trestles → other accessories are installed.

[0073] The vehicle assembly and adjustment method of this invention is used for assembly and adjustment operations. Step S1 involves leveling the base platform of the assembly and adjustment device and restoring all moving devices to their initial state. In step S2, the front-end adjustment module is adjusted to the front limit point, the front electric drive axle is installed onto the front-end adjustment module fixture, the front frame longitudinal beam is installed, and the front electric drive axle slides to the rear limit point with the front adjustment module fixture. The handwheels are adjusted to achieve adjustments in the X, Y, Z, and Z-axis directions. The electric drive axle is connected to the frame longitudinal beam via a suspension mount. The engine is installed, and the front crossbeam is installed, completing the assembly and adjustment of the front-end sub-assembly assembly. In step S3, the left and right triangular beams, protective brackets, and rear frame longitudinal beams are positioned at the designated positions on the assembly and adjustment fixture using positioning pins. The rear electric drive axle is installed onto the rear adjustment module fixture. The rear adjustment module fixture is adjusted, and the electric drive axle is connected to the triangular beams and frame longitudinal beams via a suspension mount. The large bracket and rear crossbeam are then adjusted and installed. The fourth step is to lift the central lifting platform to a high position, lower and position the vehicle body, and slowly lower it to the plane position where the vehicle body and the front and rear frames meet. Then, adjust the X and Y directions to ensure that the mounting holes are coaxial, thus achieving the positioning and connection of the three-section assembly.

[0074] Based on the above configuration or method, the front sub-assembly assembly, body assembly, and rear sub-assembly assembly are assembled and adjusted on the assembly and adjustment fixture. During the assembly and adjustment process, the front and rear longitudinal beams are positioned using front and rear positioning modules to unify the positioning reference. The application of front and rear guide rails and reducers allows for adjustments in the X, Y, Z, and Z-axis directions on the assembly and adjustment fixture without repeated disassembly and adjustment. Therefore, it reduces the complexity of assembly and adjustment and improves the quality, efficiency, and safety of product trial production or manufacturing.

[0075] As can be seen from the vehicle assembly and adjustment process in steps S1 to S4, during the assembly and adjustment of the front-end sub-assembly 21, the front-end adjustment module 33 and the front-end positioning module 32 work together in coordination. During the assembly and adjustment of the rear-end sub-assembly 23, the rear-end positioning module 35 and the rear-end adjustment module 36 work together in coordination. During the assembly and adjustment of the middle-end sub-assembly 22, a hydraulic lifting device is used for lifting and lowering. Based on the modular assembly and positioning structure, complex multi-stage assembly processes are achieved using the same tooling for positioning and assembly, unifying the assembly and positioning benchmark, reducing transfer time and risk, and improving assembly and adjustment efficiency. Both the front-end adjustment / positioning module and the rear-end adjustment / positioning module are modular assembly processes, decomposing the complex vehicle assembly process into multiple sub-modules, achieving unified benchmarks for major components, and ensuring product quality.

[0076] For the purpose of simplicity, the method steps disclosed in the above embodiments are described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0077] like Figure 2 The diagram shown illustrates the architecture of the vehicle assembly and adjustment system, used to implement the vehicle assembly and adjustment method of this application embodiment, including:

[0078] The base platform operation unit is used to perform leveling operations on the base platform and set the initial state of the equipment.

[0079] The front sub-assembly assembly adjustment unit is used to install the front electric drive axle assembly onto the front adjustment module 33. The front adjustment module 33 is controlled to position the front electric drive axle assembly, and the front positioning module 32 is controlled to position the front frame through pin positioning and clamping positioning.

[0080] The front-end adjustment module 33 is moved to the front-end positioning module 32 to connect the front electric drive axle assembly and the front frame, the engine assembly is installed and connected to the engine mount, the front crossbeam is installed, and the assembly and adjustment of the front sub-assembly assembly is completed.

[0081] The rear sub-assembly assembly adjustment unit is used by the rear positioning module 35 to position the left and right triangular beam assemblies by means of pin positioning, and to connect the triangular beam assemblies with the left and right longitudinal beams. The rear electric drive axle assembly is mounted on the rear adjustment module 36, and the rear adjustment module 36 is controlled to connect the rear electric drive axle assembly with the left and right triangular beams.

[0082] The mid-section sub-assembly assembly adjustment unit is used to lift and lower the mid-section body assembly through a hydraulic lifting device, complete the positioning of the mid-section body assembly, and fix the mid-section body assembly to the front and rear sub-assembly assemblies to achieve the overall vehicle assembly adjustment.

[0083] It is worth noting that although only some basic functional units are disclosed in the embodiments of this invention, it does not mean that the composition of this system is limited to the above-mentioned basic functional units. On the contrary, what this embodiment intends to express is that, based on the above-mentioned basic functional units, those skilled in the art can arbitrarily add one or more functional units in combination with existing technology to form an infinite number of embodiments or technical solutions. That is to say, this system is open rather than closed. The fact that this embodiment only discloses a few basic functional units should not be considered as the scope of protection of the claims of this invention being limited to the disclosed basic functional units. At the same time, for the convenience of description, the above device is described separately according to its functions as various units and modules. Of course, in implementing this invention, the functions of each unit and module can be implemented in one or more software and / or hardware.

[0084] like Figure 3 The schematic diagram of the vehicle assembly and adjustment method shown in this invention can be applied to the assembly and adjustment process of a three-stage load-bearing off-road vehicle. This invention can reduce the complexity of assembly and adjustment, improve the quality, efficiency, and safety of the assembly and adjustment process.

[0085] Based on the principle of this vehicle assembly and adjustment method, this embodiment of the invention utilizes a three-section load-bearing off-road vehicle assembly and adjustment fixture device. The three-section load-bearing off-road vehicle includes multiple components such as a body assembly, front frame longitudinal beams, front frame crossbeams, electric drive axle, electric drive axle mounts, engine and its mounts, rear frame triangular beams, rear frame longitudinal beams, protective frames, large brackets, and rear crossbeams. The assembly and adjustment device consists of a base platform, a front positioning module, a front adjustment module, a middle lifting module, a rear positioning module, and a rear adjustment module. The base platform is leveled using adjustable feet and features matrix holes for easy modification. The front and rear positioning modules are connected to the base platform's bottom plate via pin holes, primarily for positioning the front and rear longitudinal beams, serving as the main positioning structure for the entire vehicle. The front and rear adjustment modules connect to the base platform's bottom plate via guide rails, featuring a double-layer, bidirectional guide rail design. This allows the adjustment modules to slide components in the X (front-to-back) and Y (left-to-right) directions, facilitating the adjustment and assembly of the front and rear electric drive axle assemblies. Three hydraulic lifting devices enable Z-axis (up-down) adjustment, and a 20:1 reducer allows components to rotate along the Z-axis with the adjustment modules. The central lifting module uses a large-tonnage hydraulic lifting cylinder for free lifting and lowering of the vehicle body. The assembly and adjustment system allows for independent assembly and adjustment of the three modules, reducing complexity, improving efficiency and safety. A unified positioning benchmark is used throughout, enhancing assembly and adjustment quality.

[0086] like Figure 3a The overall structural diagram of the vehicle assembly and adjustment device shown includes a base platform 31. A middle lifting module 34 is installed in the middle of the base platform 31. A front positioning module 32 and a front adjustment module 33 are arranged on one side of the middle lifting module 34, and a rear positioning module 35 and a rear adjustment module 36 are arranged on the other side of the middle lifting module 34. The front positioning module 32 and the front adjustment module 33 are used to assemble and adjust the front sub-assembly 21. The front positioning module 32 and the front adjustment module 33 cooperate to assemble and adjust the rear sub-assembly 23. The middle lifting module 34 is used to fix the middle sub-assembly 22 to the front sub-assembly 21 and the rear sub-assembly 23 to realize the assembly and adjustment of the whole vehicle.

[0087] The front positioning module 32, front adjustment module 33, middle lifting module 34, rear positioning module 35, and rear adjustment module 36 all have bottom mounting surfaces and are fixed to the base platform 31 using standard positioning pins and bolts. The front positioning module 32 is used to support and position the front longitudinal beam of the frame; the front adjustment module 33 is used for the installation and adjustment of the front electric drive axle assembly; the middle lifting module 34 positions the body assembly and achieves lifting and lowering through a hydraulic mechanism; the rear positioning module 35 is used for the rear assembly's triangular beam, longitudinal beam, and bottom protective bracket; and the rear adjustment module 36 is used for the installation and adjustment of the rear electric drive axle assembly. The front positioning module 32 and the front adjustment module 33 work together to position and adjust the front sub-assembly 21; the middle lifting module 34 positions the middle sub-assembly 22 and achieves lifting and lowering through a hydraulic lifting device; the rear positioning module 35 and the rear adjustment module 36 work together to position and adjust the rear sub-assembly 23.

[0088] like Figure 4 The diagram shows the structure of the base platform 31, which includes a base platform plate 3111, a rear longitudinal guide rail 3112, a rear sliding platform 3113, a rear longitudinal adjustment handwheel 3114, a rear transverse guide rail 3115, a support adjustment foot 3116, a front transverse guide rail 3117, a front longitudinal guide rail 3118, a front limit block 3119, a front longitudinal adjustment handwheel 3120, a front sliding platform 3121, and a rear limit block 3122. A front positioning module 32 is installed on one side of the upper surface of the base platform plate 3111. A front limit block 3119 and a rear limit block 3122 are installed on both sides of the front positioning module 32. A front sliding platform 3121 is installed between the front and rear limit blocks. A front longitudinal guide rail 3118 and a front transverse guide rail 3117 are provided below the front sliding platform 3121, and the front sliding platform 3121 is slidably connected to the front longitudinal and transverse guide rails.

[0089] like Figure 5 The front positioning module structure diagram shown has a first front clamping positioning seat 321, a first front positioning pin 322, a second front clamping positioning seat 323, and a second front positioning pin 324 fixedly connected to the base platform plate 3111 of the base platform 31. The first front positioning pin 322 and the second front positioning pin 324 are used to position the left and right longitudinal beams of the front frame, respectively, and the first front clamping positioning seat 321 and the second front clamping positioning seat 323 are used to clamp the left and right longitudinal beams of the front frame.

[0090] like Figure 6 and Figure 6aThe diagram shows the structure of the front adjustment module. The front adjustment module 33 is installed on the front transverse guide rail 3117 of the base platform 31. The front adjustment module 33 includes: a front transverse moving platform 331, a front rotating platform 332, a lifting support 333, a front rotating gear shaft 334, a front transverse adjustment handwheel 335, a front rotating mechanism reducer 336, a lifting adjustment handwheel 337, and an electric drive axle suspension positioning module 338. The front transverse moving platform 331 and the front rotating platform 332 are stacked sequentially. The front rotating gear shaft 334 is installed in the middle of the front rotating platform 332. The rotating gear shaft is connected to the front rotating mechanism reducer 336. The lifting support 333 and the electric drive axle suspension positioning module 338 are installed on the upper surface of the front rotating platform 332. The electric drive axle suspension positioning module 338 is used to position the mounting holes of the electric drive axle suspension through positioning pins.

[0091] like Figure 7 The central lifting module 34 shown includes a hydraulic lifting cylinder 341, a lateral limiting block 342, a support platform 343, a support block 344, a front limiting block 345, and a lifting handwheel 346. The hydraulic lifting cylinder 341 is installed at the bottom of the support platform 343, and the support block 344 is installed on both sides of the support platform 343. The lateral limiting block 342 and the front limiting block 345 are installed around the support block 344.

[0092] like Figure 8 The rear positioning module 35 shown is mounted on the base platform plate 3111 of the base platform 31. The rear positioning module 35 includes: a rear positioning pin 351, a connecting support 352, a lower protective bracket support 353, a rear positioning pin seat 354, and a longitudinal beam support 355. The connecting support 352 and the longitudinal beam support 355 are fixedly mounted on the base platform 31. The rear positioning pin 351 can move vertically, achieving positioning with the front positioning holes of the left and right triangular beam assemblies through its movement. After positioning the left and right triangular beam assemblies, the left and right triangular beams are connected to the left and right longitudinal beams. A connecting block is placed on the lower protective bracket support 353, and bolts are used to sequentially connect the connecting block, the bottom protective bracket, and the left and right triangular beams. The rear positioning pin seat 354 and the longitudinal beam support seat 355 are used to place the left and right longitudinal beams. The rear positioning pin seat 354 is slidably installed on the slide rail. The rear positioning pin seat 354 is slidable to the positioning point and inserted into the positioning pin by the positioning pin to realize the positioning of the left and right triangular beam assemblies.

[0093] like Figure 9The rear adjustment module 36 shown is mounted on the upper surface of the rear transverse guide rail 3115 of the base platform 31 on the other side opposite to the front positioning module 32. A rear longitudinal guide rail 3112 is provided on the base platform plate 3111, and a rear sliding platform 3113 is slidably connected on the rear longitudinal guide rail. A rear transverse guide rail 3115 is installed on the upper side of the rear sliding platform 3113. The rear transverse guide rail 3115 is arranged perpendicularly to the rear longitudinal guide rail 3112.

[0094] Preferably, the rear adjustment module 36 includes a rear lateral moving platform 361, a rear rotating platform 362, a lifting support 363, a rear rotating gear shaft 364, a rear lateral adjustment handwheel 365, a rotating mechanism reducer 366, and a lifting adjustment handwheel 367. The rear lateral moving platform 361 is slidably connected to the rear lateral guide rail 3115. The rear rotating platform 362 is installed on the upper side of the rear lateral moving platform 361. The lifting support 363 is installed on the upper surface of the rear rotating platform 362. The rear rotating gear shaft 364 is installed in the middle of the rear rotating platform 362. The rear rotating gear shaft 364 is connected to a rear rotating mechanism reducer 366.

[0095] The detailed description of the vehicle assembly and adjustment device structure enables the assembly and adjustment method and system described in the embodiments of the present invention. Furthermore, based on the vehicle assembly and adjustment device, the present invention also provides a vehicle assembly and adjustment production line, a three-section load-bearing off-road vehicle assembly and adjustment production line, and an off-road vehicle based on the vehicle assembly and adjustment device.

[0096] A vehicle assembly and adjustment production line includes the vehicle assembly and adjustment device and executes the vehicle assembly and adjustment method based on the vehicle assembly and adjustment system.

[0097] A three-section load-bearing off-road vehicle assembly and adjustment production line is provided for the assembly and adjustment production of off-road vehicles based on the aforementioned vehicle assembly and adjustment production line.

[0098] An off-road vehicle, said off-road vehicle being manufactured by the aforementioned three-section load-bearing off-road vehicle assembly and adjustment production line.

[0099] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, any of the embodiments claimed in the claims can be used in any combination of embodiments of the invention.

[0101] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0102] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0103] All features disclosed in this specification, or steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps. Any feature disclosed in this specification, unless specifically stated otherwise, may be replaced by other equivalent or similar features. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features. Throughout this specification, the same reference numerals indicate the same elements.

[0104] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the corresponding claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the corresponding claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for assembling and adjusting a vehicle, characterized in that, include: Base platform operation: Perform leveling operation on the base platform and set the initial state of the equipment; Front-end sub-assembly assembly and adjustment: The front electric drive axle assembly is installed onto the front adjustment module. The front adjustment module is controlled to position the front electric drive axle assembly. The front positioning module is controlled to position the front frame through pin positioning and clamping positioning. The front adjustment module moves towards the front positioning module, connects the front electric drive axle assembly and the front frame, installs the engine assembly and connects the engine mount, installs the front crossbeam, and completes the assembly and adjustment of the front sub-assembly assembly. Rear assembly assembly adjustment: The rear positioning module positions the left and right triangular beam assemblies by pin positioning and connects the triangular beam assemblies to the left and right longitudinal beams. The rear electric drive axle assembly is mounted on the rear adjustment module, which controls the connection between the rear electric drive axle assembly and the left and right triangular beams. Mid-section sub-assembly assembly adjustment: The mid-section body assembly is raised and lowered by a hydraulic lifting device to complete the positioning of the mid-section body assembly, and then fixedly connected to the front and rear sub-assembly assemblies to achieve the overall vehicle assembly adjustment. The front-end positioning module is installed on one side of the upper surface of the base platform plate. A front limit block and a rear limit block are installed on both sides of the front-end positioning module. A front sliding platform is installed between the front and rear limit blocks. A front longitudinal guide rail and a front transverse guide rail are provided below the front sliding platform. The front sliding platform is slidably connected to the front longitudinal and transverse guide rails. A first front clamping positioning seat, a first front positioning pin, a second front clamping positioning seat, and a second front positioning pin are fixedly connected on the upper part of the base platform plate of the base platform. The first front positioning pin and the second front positioning pin are used to position the left and right longitudinal beams of the front frame, respectively. The first front clamping positioning seat and the second front clamping positioning seat are used to clamp the left and right longitudinal beams of the front frame. The front adjustment module is installed on the front transverse guide rail of the base platform. The front adjustment module includes: a front transverse moving platform, a front rotating platform, a lifting support seat, a front rotating gear shaft, a front transverse adjustment handwheel, a front rotating mechanism reducer, a lifting adjustment handwheel, and an electric drive axle suspension positioning module. The front transverse moving platform and the front rotating platform are stacked sequentially. A front rotating gear shaft is installed in the middle of the front rotating platform. The rotating gear shaft is connected to the front rotating mechanism reducer. A lifting support seat and an electric drive axle suspension positioning module are installed on the upper surface of the front rotating platform. The electric drive axle suspension positioning module is used to position the mounting holes of the electric drive axle suspension through positioning pins.

2. The vehicle assembly and adjustment method according to claim 1, characterized in that, During the assembly and adjustment process of the front-end sub-assembly, the following steps are further included: positioning the front electric drive axle assembly by controlling the front-end adjustment module to perform translation, lifting, or rotation; positioning the pin by controlling the positioning pin of the front-end positioning module; the positioning pin is used to position the left and right longitudinal beams of the front frame; and clamping the positioning seat of the front-end positioning module to achieve the clamping positioning function. The clamping positioning seat includes a first front clamping positioning seat and a second front clamping positioning seat, which are used to clamp the left and right longitudinal beams of the front frame, respectively.

3. The vehicle assembly and adjustment method according to claim 1, characterized in that, During the assembly and adjustment of the rear sub-assembly, the rear positioning module positions the left and right triangular beam assemblies through the rear positioning pins and rear positioning pin seats, connects the left and right triangular beam assemblies to the left and right rear longitudinal beams, and installs the bottom protective bracket. The rear adjustment module controls the rear electric drive axle assembly to connect to the left and right triangular beam assemblies, assembles the front crossbeam of the rear frame and the rear crossbeam of the rear frame, and completes the assembly and adjustment of the rear sub-assembly.

4. The vehicle assembly and adjustment method according to claim 3, characterized in that, After installing the bottom protective bracket, place a connecting block on the connector support of the rear positioning module, and use bolts to connect the connecting block, the bottom protective bracket, and the left and right triangular beam assemblies in sequence.

5. The vehicle assembly and adjustment method according to claim 1, characterized in that, During the assembly and adjustment of the mid-section sub-assembly, the upper surface of the support block of the mid-section lifting module is raised so that the upper surface of the support block is higher than the front positioning pin 2 and the rear positioning pin of the front positioning module. The mid-section body assembly is hoisted and positioned. The support block is lowered so that the positioning holes of the mid-section body assembly fall into the front positioning pin 2 and the rear positioning pin respectively, thus completing the positioning of the mid-section body assembly.

6. The vehicle assembly and adjustment method according to claim 5, characterized in that, When hoisting the mid-section body assembly, front limit blocks and side limit blocks are used to position the mid-section body assembly in the X and Y directions, respectively.

7. A vehicle assembly and adjustment system for implementing the vehicle assembly and adjustment method according to any one of claims 1 to 6, characterized in that, include: The base platform operation unit is used to perform leveling operations on the base platform and set the initial state of the equipment. The front sub-assembly assembly adjustment unit is used to install the front electric drive axle assembly onto the front adjustment module. The front adjustment module is controlled to position the front electric drive axle assembly, and the front positioning module is controlled to position the front frame through pin positioning and clamping positioning. The front adjustment module moves towards the front positioning module, connects the front electric drive axle assembly and the front frame, installs the engine assembly and connects the engine mount, installs the front crossbeam, and completes the assembly and adjustment of the front sub-assembly assembly. The rear sub-assembly assembly adjustment unit is used by the rear positioning module to position the left and right triangular beam assemblies by means of pin positioning, and connect the triangular beam assemblies to the left and right longitudinal beams. The rear electric drive axle assembly is mounted on the rear adjustment module, and the rear adjustment module is controlled to connect the rear electric drive axle assembly to the left and right triangular beams. The mid-section sub-assembly assembly adjustment unit is used to lift and lower the mid-section body assembly through a hydraulic lifting device, complete the positioning of the mid-section body assembly, and fix the mid-section body assembly to the front and rear sub-assembly assemblies to achieve the overall vehicle assembly adjustment.

8. A vehicle assembly and adjustment device, characterized in that, Used to implement the vehicle assembly and adjustment method according to any one of claims 1 to 6; The vehicle assembly and adjustment device includes a base platform, a central lifting module installed in the middle of the base platform, a front positioning module and a front adjustment module on one side of the central lifting module, and a rear positioning module and a rear adjustment module on the other side of the central lifting module. The front positioning module and the front adjustment module are used for assembling and adjusting the front sub-assembly assembly, and the front positioning module and the front adjustment module are used for assembling and adjusting the rear sub-assembly assembly. The central lifting module is used to fix the central sub-assembly assembly to the front sub-assembly assembly and the rear sub-assembly assembly, thereby realizing the assembly and adjustment of the entire vehicle.

9. The vehicle assembly and adjustment device according to claim 8, characterized in that, The rear positioning module is installed on the base platform plate of the base platform. The rear positioning module includes: a rear positioning pin, a connector support seat, a lower protective bracket support seat, a rear positioning pin seat, and a longitudinal beam support seat. The connector support seat and the longitudinal beam support seat are fixedly installed on the base platform. The rear positioning pin can move in the vertical direction. The movement of the rear positioning pin realizes positioning with the front positioning holes of the left and right triangular beam assemblies. The rear positioning pin seat and the longitudinal beam support seat are used to place the left and right longitudinal beams. The rear positioning pin seat is slidably installed on the slide rail. The positioning pin seat is slidable to the positioning point and inserted into the positioning pin to realize the positioning of the left and right triangular beam assemblies.

10. The vehicle assembly and adjustment device according to claim 8, characterized in that, The rear adjustment module is installed on the upper surface of the rear transverse guide rail of the base platform on the other side opposite to the front positioning module. A rear longitudinal guide rail is provided on the base platform plate. A rear sliding platform is slidably connected on the rear longitudinal guide rail. A rear transverse guide rail is installed on the upper side of the rear sliding platform. The rear transverse guide rail is arranged perpendicularly to the rear longitudinal guide rail.

11. The vehicle assembly and adjustment device according to claim 10, characterized in that, The rear adjustment module includes a rear lateral moving platform, a rear rotating platform, a lifting support seat, a rear rotating gear shaft, a rear lateral adjustment handwheel, a rotating mechanism reducer, and a lifting adjustment handwheel. The rear lateral moving platform is slidably connected to the rear lateral guide rail. A rear rotating platform is installed on the upper side of the rear lateral moving platform. A lifting support seat is installed on the upper surface of the rear rotating platform. A rear rotating gear shaft is installed in the middle of the rear rotating platform. The rear rotating gear shaft is connected to a rear rotating mechanism reducer.

12. The vehicle assembly and adjustment device according to claim 8, characterized in that, The central lifting module includes a hydraulic lifting cylinder, a lateral limiting block, a support platform, a support block, a front limiting block, and a lifting handwheel. The hydraulic lifting cylinder is installed at the bottom of the support platform, and the support block is installed on both sides of the support platform. Lateral limiting blocks and front limiting blocks are installed around the support block.

13. A vehicle assembly and adjustment production line, characterized in that, The vehicle assembly and adjustment production line includes the vehicle assembly and adjustment device according to any one of claims 8 to 12, and performs the vehicle assembly and adjustment method according to any one of claims 1 to 6 based on the vehicle assembly and adjustment system according to claim 7.

14. A three-section load-bearing off-road vehicle assembly and adjustment production line, characterized in that, The vehicle assembly and adjustment production line described in claim 13 is used for the assembly and adjustment production of off-road vehicles.

15. An off-road vehicle, characterized in that, The off-road vehicle is manufactured using the three-section load-bearing off-road vehicle assembly and adjustment production line as described in claim 14.

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