Welding fixture for pick-up frame of automobile chassis

Abstract

An automobile chassis pickup truck frame welding clamp is characterized by comprising a base plate. The guiding mechanism, the engine front suspension frame positioning and clamping mechanism, the longitudinal beam positioning and clamping mechanism, the longitudinal beam middle section positioning and clamping mechanism, the longitudinal beam rear section clamping mechanism, the container mounting support positioning and clamping mechanism, the jacking mechanism and the like are arranged on the base plate through fine adjustment mechanisms. All the mechanisms are installed on the fine adjustment mechanism, size fine adjustment in three directions can be achieved, and the final product size state is met. The clamping mechanism adopts pneumatic clamping, is simple in structure, reasonable in design, convenient to operate, accurate in positioning, short in clamp machining and manufacturing period and good in flexibility, can quickly meet the trial-manufacturing requirements of sample pieces, meets the loading plan arrangement, and meanwhile can avoid high clamp change cost caused by one-time investment of formal clamp change due to product design change. The clamp is low in machining and manufacturing cost, short in changing period and capable of coping with product design changes at any time.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts processing technology, specifically relating to a welding fixture for automotive chassis pickup truck frames. Background Technology

[0002] The chassis is a frame structure spanning the front and rear axles of a car, commonly known as a beam, and is the base of the vehicle. It generally consists of two longitudinal beams and several transverse beams, supported on the wheels via the suspension system, front axle, and rear axle. The chassis must have sufficient strength and rigidity to withstand the vehicle's loads and impacts transmitted from the wheels. The chassis's function is to support and connect the various assemblies of the car, maintaining their relatively correct positions and bearing various loads from inside and outside the vehicle. The chassis is crucial for vehicles with a non-load-bearing body design, as it isolates road vibrations for better comfort and improves body rigidity. After completing the design, OEMs conduct mule car verification (test vehicles during the vehicle development phase), primarily verifying the performance parameters of components such as the chassis and different engine models. The number of mule cars installed is generally two, not exceeding five. For newly designed and developed models, OEMs require chassis suppliers to provide mule car verification chassis products. Due to the uncertainty of mule car verification results, the structural design of the chassis is modified accordingly. Therefore, if a formal welding fixture is designed during the mule cart testing phase, modifications to the design may lead to the fixture needing to be modified or scrapped, resulting in uncontrollable risks and high costs. Therefore, a simple, low-cost, and versatile welding fixture is needed to accommodate temporary or small-volume welding operations. Utility Model Content

[0003] The purpose of this utility model is to provide a welding fixture for automobile chassis pickup truck frames to solve the problems in the prior art.

[0004] This utility model is achieved through the following technical solution: a welding fixture for a pickup truck chassis, characterized in that: 1. a welding fixture for a pickup truck chassis, characterized in that: it includes a base plate, on which a lifting mechanism, a cargo box bracket positioning mechanism, a front suspension bracket positioning mechanism and a longitudinal beam clamping mechanism are provided;

[0005] The lifting mechanism includes a lifting cylinder, a guide column, a guide column positioning block, a lifting connecting block, and a guide block. The lifting cylinder is fixed to the base plate by a fixing frame. The lifting connecting block is fixed to the piston of the lifting cylinder. Guide blocks are provided at both ends of the lifting connecting block and a guide column is provided at the lower end. The guide column slides in cooperation with the guide column positioning block provided on the fixing frame.

[0006] The cargo box support positioning mechanism includes a cargo box support base, a cargo box support clamping cylinder, a cargo box support clamping block, a cylinder connecting block, an auxiliary L-shaped block, an auxiliary positioning block, a cargo box support clamping arm, and a base plate connecting block.

[0007] The front suspension bracket positioning mechanism includes an engine front suspension bracket base, an engine front suspension bracket connecting block, an engine front suspension bracket positioning block, and an engine front suspension bracket L-shaped block; the front suspension bracket base is fixed to the base plate by bolts, and the engine front suspension bracket positioning block and the engine front suspension bracket L-shaped block are connected to the upper end by bolts; a positioning slope is provided above the engine front suspension bracket positioning block.

[0008] The longitudinal beam clamping mechanism includes a longitudinal beam positioning base, a longitudinal beam clamping cylinder, a longitudinal beam positioning block, a longitudinal beam clamping block, and a longitudinal beam clamping limit block. The longitudinal beam positioning base and the longitudinal beam positioning block are respectively fixed to the base plate by bolts. The longitudinal beam clamping cylinder is fixed to the longitudinal beam positioning base. The longitudinal beam clamping block is hinged to the piston end of the longitudinal beam clamping cylinder and is limited in cooperation with the longitudinal beam clamping limit block.

[0009] The beneficial effects of this utility model are as follows: Because the base plate used in this utility model is symmetrically equipped with a front suspension bracket positioning and clamping mechanism, a longitudinal beam front, middle, and rear positioning and clamping mechanism, and a cargo box mounting bracket positioning and clamping mechanism on both sides, and the engine front suspension bracket positioning and clamping mechanism is mounted on a fine-tuning mechanism, it can achieve micro-adjustment of dimensions in three directions to meet the final product size requirements. The clamping mechanism adopts pneumatic clamping. Its structure is simple, its design is reasonable, its operation is easy to understand, its positioning is accurate, and its fixture processing and manufacturing cycle is short. It can quickly respond to sample production needs and meet vehicle assembly schedules, while avoiding the high fixture design change costs incurred due to product design changes requiring a one-time investment in formal fixture modifications. The fixture processing and manufacturing cost is low. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the positioning and clamping mechanism for the engine front suspension bracket of this utility model;

[0012] Figure 3 This is a schematic diagram of the positioning and clamping mechanism of the cargo box bracket of this utility model;

[0013] Figure 4 This is a schematic diagram of the lifting mechanism of this utility model;

[0014] Figure 5 This is a schematic diagram of the longitudinal beam clamping mechanism of this utility model;

[0015] Figure 6 This is a schematic diagram of the usage state of this utility model.

[0016] Explanation of the serial numbers in the diagram:

[0017] 1 is the base plate; 2 is the front lifting mechanism; 3 is the engine front suspension bracket positioning mechanism; 4 is the longitudinal beam mid-section positioning and clamping mechanism I; 5 is the longitudinal beam mid-section positioning and clamping mechanism II; 6 is the cargo box front bracket positioning and clamping mechanism I; 7 is the cargo box middle bracket positioning and clamping mechanism I; 8 is the longitudinal beam rear section positioning and clamping mechanism I; 9 is the cargo box rear bracket positioning and clamping mechanism I; 10 is the start button box; 11 is the cargo box rear bracket positioning and clamping mechanism II; 12 is the longitudinal beam rear section positioning and clamping mechanism II; 13 is the rear main positioning pin; 14 is the cargo box middle bracket positioning and clamping mechanism II; 15 is the rear lifting mechanism; 16 is the cargo box front bracket positioning and clamping mechanism II; 17 is the longitudinal beam mid-section positioning and clamping mechanism III; 18 is the longitudinal beam mid-section positioning and clamping mechanism IV; 19 is the longitudinal beam front section positioning and clamping mechanism II; 20 is the main positioning pin.

[0018] 22 is the engine front mount bracket base; 23 is the engine front mount bracket connecting block; 24 is the engine front mount bracket positioning block; 25 is the engine front mount bracket L-shaped block; 26 is the adjusting shim.

[0019] 27 is the positioning pin of the cargo box bracket; 28 is the base of the cargo box bracket; 29 is the clamping cylinder of the cargo box bracket; 30 is the clamping block of the cargo box bracket. 301 is the cylinder connecting block; 302 is the auxiliary L-shaped block; 303 is the auxiliary positioning block; 304 is the clamping arm of the cargo box bracket; 305 is the base plate connecting block.

[0020] 31 is the lifting cylinder; 32 is the guide post; 33 is the guide post positioning block; 34 is the lifting connecting block; 35 is the guide block.

[0021] 36 is the longitudinal beam positioning base; 37 is the longitudinal beam clamping cylinder; 38 is the longitudinal beam positioning block; 39 is the longitudinal beam clamping block; 40 is the longitudinal beam clamping limit block;

[0022] 100 is a car chassis for pickup trucks. Detailed Implementation

[0023] Reference Appendix Figure 1-6 This utility model provides a welding fixture for a pickup truck chassis for fixing a pickup truck chassis 100 during welding. It includes a base plate, on which a lifting mechanism, a cargo box bracket positioning mechanism, a front suspension bracket positioning mechanism, and a longitudinal beam clamping mechanism are provided.

[0024] The lifting mechanism consists of two sets: a front lifting mechanism 2 and a rear lifting mechanism 15, corresponding to the front and rear ends of the vehicle frame. Each lifting mechanism includes a lifting cylinder, a guide column, a guide column positioning block, a lifting connecting block, and a guide block. The lifting cylinder is fixed to the base plate by a fixing frame, and the lifting connecting block is fixed to the piston of the lifting cylinder. Guide blocks are provided at both ends of the lifting connecting block, and a guide column is provided at the lower end. The guide column slides in cooperation with the guide column positioning block provided on the fixing frame. The lifting connecting block and the guide block of the lifting mechanism cooperate with the vehicle frame and lift the vehicle frame under the drive of the lifting cylinder.

[0025] There are multiple sets of cargo box bracket positioning mechanisms, corresponding to different positions on the vehicle frame. These are: cargo box front bracket positioning and clamping mechanism I6, cargo box middle bracket positioning and clamping mechanism I7, cargo box rear bracket positioning and clamping mechanism I9, cargo box rear bracket positioning and clamping mechanism II11, cargo box middle bracket positioning and clamping mechanism II14, and cargo box front bracket positioning and clamping mechanism II16. Each mechanism includes a cargo box bracket base, a cargo box bracket clamping cylinder, a cargo box bracket clamping block, a cylinder connecting block, an auxiliary L-shaped block, an auxiliary positioning block, a cargo box bracket clamping arm, and a base plate connecting block. These components are connected to the base plate via hexagonal bolts and positioning pins. The upper end is bolted to the cargo box bracket positioning pin, cargo box bracket clamping block, and auxiliary positioning block. The cargo box bracket positioning pin is fixed to the base via an L-shaped block, cooperating with the cargo box bracket auxiliary L-shaped block to achieve workpiece positioning and clamping. The cargo box bracket base is fixedly connected to the base plate connecting block. The cargo box bracket clamping cylinder is fixed to the cargo box bracket base, and the piston rod end is hinged to a cylinder connecting block. The connecting block is also hinged to the bottom plate connecting block. The cylinder connecting block is equipped with a cargo box bracket clamping block and a cargo box bracket clamping arm, which, driven by the cylinder, can simultaneously clamp two corresponding positions of the cargo box bracket on the vehicle frame. An auxiliary L-shaped block is provided on the bottom plate connecting block, with an auxiliary positioning block at its upper end. The auxiliary positioning block cooperates with both sides of the cargo box bracket, serving a limiting function. Another auxiliary L-shaped block is also provided at a corresponding position on the lower side of the cargo box bracket. This auxiliary L-shaped block is fixed to the bottom plate connecting block, with its upper end cooperating with the lower end of the cargo box bracket, providing support and simultaneously clamping with the cargo box bracket clamping block. Adjusting shims 26 are also included, positioned between the auxiliary L-shaped blocks and the bottom plate connecting block and / or the auxiliary positioning block, for adjustment purposes.

[0026] The front suspension bracket positioning mechanism includes an engine front suspension bracket base, an engine front suspension bracket connecting block, an engine front suspension bracket positioning block, and an engine front suspension bracket L-shaped block; the front suspension bracket base is fixed to the base plate by bolts, and the engine front suspension bracket positioning block and the engine front suspension bracket L-shaped block are connected to the upper end by bolts; a positioning slope is provided above the engine front suspension bracket positioning block.

[0027] There are multiple longitudinal beam clamping mechanisms, corresponding to different positions on the frame, including longitudinal beam mid-section positioning clamping mechanism I4, longitudinal beam mid-section positioning clamping mechanism II5, longitudinal beam rear section positioning clamping mechanism I8, longitudinal beam rear section positioning clamping mechanism II12, longitudinal beam mid-section positioning clamping mechanism III17, longitudinal beam mid-section positioning clamping mechanism IV18, and longitudinal beam front section positioning clamping mechanism II19. The longitudinal beam clamping mechanism includes a longitudinal beam positioning base, a longitudinal beam clamping cylinder, a longitudinal beam positioning block, a longitudinal beam clamping block, and a longitudinal beam clamping limit block. The longitudinal beam positioning base and the longitudinal beam positioning block are respectively fixed to the base plate by bolts. The longitudinal beam clamping cylinder is fixed to the longitudinal beam positioning base. The longitudinal beam clamping block is hinged to the piston end of the longitudinal beam clamping cylinder and is limited and engaged with the longitudinal beam clamping limit block.

[0028] The following examples will provide a detailed description of this solution.

[0029] Example: Figure 1The diagram shows a welding fixture for an automobile chassis frame according to the present invention. It includes a base plate 1 with casters and fixing mechanisms corresponding to various components on the frame, specifically including: a front lifting mechanism 2, a rear lifting mechanism 15, a longitudinal beam mid-section clamping mechanism I4, a longitudinal beam mid-section positioning clamping mechanism II5, a longitudinal beam rear section positioning clamping mechanism I8, a longitudinal beam rear section positioning clamping mechanism II12, a longitudinal beam mid-section positioning clamping mechanism III17, and a longitudinal beam mid-section positioning clamping mechanism IV18. The system includes: a front-end positioning and clamping mechanism II19; an engine front mount bracket positioning mechanism 3; a cargo box front bracket positioning and clamping mechanism I6; a cargo box middle bracket positioning and clamping mechanism I7; a cargo box rear bracket positioning and clamping mechanism I9; a cargo box rear bracket positioning and clamping mechanism II11; a cargo box middle bracket positioning and clamping mechanism II14; a cargo box front bracket positioning and clamping mechanism II16; a main positioning pin 20; a rear main positioning pin 13; and a start button box 10 (the button box 10 is connected to the base plate by bolts, and its internal circuitry and air passages are existing technology). All of the above mechanisms are fixed to the base plate by bolts and positioning pins. The specific design can be adjusted according to the engine front mount configuration and cargo box configuration, offering good flexibility and strong applicability. The positions of each mechanism correspond to the specific component positions of the chassis. Specifically, the left and right sides of the base plate 1 are provided with the following mechanisms: front suspension bracket positioning mechanism 3, longitudinal beam mid-section positioning and clamping mechanism I4, longitudinal beam mid-section positioning and clamping mechanism II5, longitudinal beam rear section positioning and clamping mechanism I8, longitudinal beam rear section positioning and clamping mechanism II12, longitudinal beam mid-section positioning and clamping mechanism III17, longitudinal beam mid-section positioning and clamping mechanism IV18, longitudinal beam front section positioning and clamping mechanism II19, cargo box front bracket positioning and clamping mechanism I6, cargo box middle bracket positioning and clamping mechanism I7, cargo box rear bracket positioning and clamping mechanism I9, cargo box rear bracket positioning and clamping mechanism II11, cargo box middle bracket positioning and clamping mechanism II14, cargo box front bracket positioning and clamping mechanism II16; the front lifting mechanism 2 and the rear lifting mechanism 15 are provided at the front and rear ends of the base plate 1; chassis main positioning pin 20 and rear main positioning pin 13 are provided.

[0030] The Figure 2 The engine front mount positioning mechanism is located forward of the centerline of the base plate 1, and includes an engine front mount base 22; an engine front mount connecting block 23; an engine front mount positioning block 24; an engine front mount L-shaped block 25; and adjusting shims 26. The engine front mount positioning mechanism positions the engine front mount relative to the longitudinal beam using two positioning pins through positioning holes. The engine front mount base 22 is connected to the base plate via hexagonal bolts and positioning pins. The engine front mount positioning block 24 allows for fine adjustments in the X and Y directions (frame length and width directions) of the engine front mount positioning by adding or removing adjusting shims 26. Fine adjustments in the Z-direction height are achieved by adding shims to the bottom of the engine front mount connecting block 23.

[0031] The Figure 3 The cargo box bracket positioning and clamping mechanism is symmetrically distributed at both ends of the longitudinal beam along the centerline of the base plate 1. It includes a cargo box bracket positioning pin 27; a cargo box bracket base 28; a cargo box bracket clamping cylinder 29; a cargo box bracket clamping block 30; a cylinder connecting block 301; an auxiliary L-shaped block 302; an auxiliary positioning block 303; a cargo box bracket clamping arm 304; and a base plate connecting block 305. The cargo box bracket base 28 is connected to the base plate via hexagonal bolts and positioning pins. The cargo box bracket positioning pin 27 can be finely adjusted in the X and Y directions by adding or removing adjusting shims 26. The Z-direction height of the positioning pin can be finely adjusted by adding adjusting shims to the lower end of the positioning pin. The cargo box bracket is placed into the positioning pin, and the cylinder is clamped by operating the button box, thus achieving the positioning and clamping of the cargo box bracket. The positioning and clamping mechanisms of the front, middle and rear supports of the cargo box are completely similar in structure and are symmetrically distributed according to the front, middle and rear positions of the cargo box supports. By adjusting the air path, the front, middle and rear supports of the cargo box can be clamped at the same time and opened at the same time after welding.

[0032] The Figure 4 One lifting and lowering mechanism is located at the front and one at the rear of the base plate, with similar structures. The mechanism includes a lifting cylinder 31, a guide post 32, a guide post positioning block 33, a lifting connecting block 34, and a guide block 35. The lifting mechanism is primarily used to lower the workpiece (such as a chassis) after it has been placed in the base plate, and after welding, to lift the chassis and move it to a transfer container. The guide block 35 ensures the workpiece is accurately placed in the designated position. The guide post 32 ensures stable lifting operation, preventing the workpiece from tipping over due to unevenness.

[0033] The Figure 5 The longitudinal beam clamping mechanism is evenly and symmetrically distributed at the front, middle, and rear ends of the substrate, including a longitudinal beam positioning base 36; a longitudinal beam clamping cylinder 37; a longitudinal beam positioning block 38; a longitudinal beam clamping block 39; and a longitudinal beam clamping limit block 40. The longitudinal beam positioning and clamping mechanism, together with the main positioning pin 20 and the rear main positioning pin 13, can completely position the chassis. The workpiece is placed in the fixture, and the pneumatic button is pressed to lower the workpiece until it is completely positioned in the positioning pins in the X and Y directions. The longitudinal beam clamping mechanism completely positions the workpiece in the Z direction, thus completing the clamping and positioning. After welding is completed, the pneumatic button is activated again to open the fixture, which is then lifted and moved to the logistics equipment, completing the operation. All mechanisms are mounted on a fine-tuning mechanism, allowing for micro-adjustments in three directions to meet the final product size requirements. The clamping mechanism uses pneumatic clamping, which is simple in structure, rationally designed, easy to operate, and accurately positioned. The fixture manufacturing cycle is short, and it offers good flexibility, enabling rapid response to sample production needs and meeting vehicle assembly schedules. Fixtures have low manufacturing costs, short change cycles, and can respond to product design changes at any time.

Claims

1. An automotive chassis pickup truck frame welding fixture, characterized by: The base plate is provided with a jacking mechanism, a box support positioning mechanism, a front suspension support positioning mechanism and a longitudinal beam clamping mechanism. The jacking mechanism comprises a jacking cylinder, a guide column, a guide column positioning block, a jacking connecting block and a guide block. The box support positioning mechanism comprises a box support base, a box support clamping cylinder and a box support clamping block. The front suspension support positioning mechanism comprises an engine front suspension support base, an engine front suspension support connecting block, an engine front suspension support positioning block and an engine front suspension support L-shaped block. The longitudinal beam clamping mechanism comprises a longitudinal beam positioning base, a longitudinal beam clamping cylinder, a longitudinal beam positioning block, a longitudinal beam clamping block and a longitudinal beam clamping limiting block.

2. The automotive chassis pickup truck frame welding fixture of claim 1, wherein: The box support positioning mechanism further comprises a bottom plate connecting block, which is provided with an auxiliary L-shaped block and an auxiliary positioning block. The box support clamping arm and the box support clamping block are connected to the box support clamping cylinder through a cylinder connecting block. The cylinder connecting block is further hingedly connected to the bottom plate connecting block.

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