A welding positioning device for vehicle engine bracket machining

Abstract

The present application relates to a kind of welding positioning device for vehicle engine bracket processing, it is related to welding positioning clamping technical field.To overcome the shortcoming that cannot realize synchronous clamping and the balance between the clamping pressure of each pressure head, it is difficult to truly achieve the effect of "self-adaptive fit".A kind of welding positioning device for vehicle engine bracket processing, including base, the top of base one end is the load end of supporting engine bracket, at least three screw rods are rotatably connected in base, the lock assembly for fastening sliding block and plane moving frame is arranged on one side of sliding block, flexible clamping assembly for clamping the curved surface of engine bracket is fixedly connected at one end of clamping rod.The present application is independently deflected by angle adjusting rod in initial contact stage, first completes the self-adaptive of the topography of irregular curved surface, fundamentally solves the local stress concentration, workpiece deformation or virtual clamping problem caused by uneven pressure of traditional fixture, significantly improves welding positioning precision and reliability.

Description

Technical Field

[0001] This invention relates to the field of welding positioning and clamping technology, and more particularly to a welding positioning device for processing vehicle engine brackets. Background Technology

[0002] In modern manufacturing, engine brackets, as critical structural support components, typically exhibit highly complex and irregular geometries, especially the end connecting to the engine, which often presents curved surfaces or irregular contours. During machining, inspection, or assembly, these workpieces place extremely high demands on the adaptability and stability of the clamping system. Traditional rigid fixtures struggle to effectively conform to such irregular contours, often leading to localized stress concentrations, unstable clamping, and even workpiece deformation, severely impacting machining accuracy and production efficiency.

[0003] Currently, most common clamping methods rely on manual intervention. Operators need to adjust the position and pressure of the clamping heads point by point according to the shape of the workpiece. This is not only time-consuming and labor-intensive, but also results in poor repeatability and difficulty in ensuring consistency. In addition, although some automated clamps adopt a multi-point contact design, there are tolerances between engine bracket components, and there is a lack of adjustment and coordination mechanisms between the clamping heads. This makes it impossible to achieve synchronous clamping and balance between the clamping pressure of each clamping head, and it is difficult to truly achieve the effect of "self-adaptive fit". Summary of the Invention

[0004] In order to overcome the shortcomings of not being able to achieve synchronous clamping and balance between the clamping pressure of each pressure head, and thus making it difficult to truly achieve the "adaptive fit" effect, the purpose of this invention is to provide a welding positioning device for processing vehicle engine brackets.

[0005] The technical solution is as follows: A welding positioning device for processing a vehicle engine bracket includes a base, one top end of which is a bearing end supporting the engine bracket. At least three screws are rotatably connected inside the base. A movable reference block is slidably connected to the base, and the movable reference block is threadedly connected to the screws. A fixed reference plate is fixedly connected to the top of the base. A cylinder is fixedly installed on the base and symmetrically arranged along the base. A sliding plate is slidably connected to the bearing end of the base. One end of the sliding plate is fixedly connected to the telescopic end of the cylinder. Multiple sliders that can move along their length are slidably connected to the sliding plate. A planar moving frame is slidably connected inside each slider. A sliding cavity is provided inside the planar moving frame. A clamping rod is slidably connected inside the sliding cavity. A piston head is fixedly connected to one side of the clamping rod and slidably connected to the sliding cavity. An air passage connection port for connecting to an air supply device is provided at one end of the sliding cavity. A locking component for fastening the slider and the planar moving frame is provided on one side of the slider. A flexible clamping component for clamping the curved surface of the engine bracket is fixedly connected to one end of the clamping rod.

[0006] More preferably, the locking assembly includes a locking plate fixedly connected to one end of the planar moving frame, a pre-tightening block slidably connected to one side of the slider, the pre-tightening block cooperating with the locking plate, the pre-tightening block moving towards the locking plate and pressing against it under external pressure, the static friction generated when they press against each other prevents the planar moving frame from shifting, a telescopic rod fixedly connected to the side of the pre-tightening block away from the locking plate, the telescopic rod slidably connected to the slider, a limiting block fixedly connected to the other end of the telescopic rod, the limiting block cooperating with the sliding plate, the limiting block moving towards the sliding plate and pressing against it under external pressure, the static friction generated when they press against each other prevents the slider from shifting.

[0007] More preferably, the flexible clamping assembly includes a telescopic rod two fixed to one end of the clamping rod, and an angle adjustment rod is fixedly connected to the telescopic end of the telescopic rod two. A ball head is sleeved on the end of the angle adjustment rod away from the clamping rod, and the ball head can be deflected at any angle relative to the end of the angle adjustment rod.

[0008] More preferably, the number of sliders is at least three.

[0009] More preferably, it also includes a reset plate, which is fixedly connected to the end of the base opposite to the moving reference block, for passively pushing the planar moving frame to reset.

[0010] More preferably, it also includes a second cylinder, which is symmetrically arranged at both ends along the length of the sliding plate. A pressing plate is fixedly connected between the symmetrically arranged second cylinders. The pressing plate is slidably connected to the sliding plate. A gas distribution frame is fixedly connected to one end of the sliding plate. A rotary valve is rotatably connected inside the gas distribution frame to control the opening and closing of the flow passage inside the gas distribution frame. A connecting rod is rotatably connected to the end of the rotary valve away from the gas distribution frame. The other end of the connecting rod is rotatably connected to the pressing plate. An air pipe is fixedly connected between the gas distribution frame and the air passage connection port. An air inlet connected to a gas supply device is provided at the corresponding end of the gas distribution frame. Gas enters the sliding cavity through the gas distribution frame and the air pipe to push the clamping rod to move.

[0011] More preferably, the number of tracheas corresponds to the number of planar moving frames.

[0012] More preferably, it also includes a distance adjustment rod, which is fixedly connected to one end of the clamping rod and slidably connected to the planar moving frame. The distance adjustment rod is provided with an adjustment thread, and an adjustment ring for limiting the movement distance of the distance adjustment rod is connected to the adjustment thread.

[0013] The beneficial effects are as follows: the present invention enables the angle adjustment rod to deflect independently during the initial contact stage, thereby first achieving adaptive adaptation to the shape of irregular curved surfaces; subsequently, after the locking assembly is fixed in position, all clamping rods are driven to advance synchronously by a unified air source, ensuring that the same clamping force is applied to each clamping point, fundamentally solving the problems of local stress concentration, workpiece deformation or false clamping caused by uneven pressure in traditional fixtures, and significantly improving the welding positioning accuracy and reliability.

[0014] During clamping, the telescopic rod 2 can adaptively contract under force via the angle adjustment rod, forming an elastic buffer. When the high temperature of welding causes the material to expand or contract due to cooling, this flexible structure allows for slight displacement of the clamping point, releasing some thermal stress and avoiding warping, cracking, or dimensional deviations caused by rigid constraints. It is especially suitable for high-quality welding of thin-walled or high-strength material brackets.

[0015] Each planar moving frame stops and contacts the reset plate sequentially according to its actual contact sequence during the clamping stage, automatically compensating for travel differences caused by workpiece contour tolerances and avoiding mutual squeezing or jamming of components during the reset process. At the same time, all components are ultimately limited by the reset plate, ensuring that each cycle ends at the same reference state, eliminating error accumulation and improving the accuracy of repeated clamping.

[0016] By rotating the adjusting ring and moving it closer to the rear end face of the planar moving frame, the maximum forward stroke of the clamping rod can be mechanically limited, thereby actively controlling the final clamping force. For brackets made of thin-walled aluminum alloys, magnesium alloys, or other easily deformable materials, operators can pre-set a smaller clamping stroke according to the workpiece characteristics to avoid local indentation, instability, or residual stress concentration due to excessive clamping force. This design eliminates the need to change fixtures or adjust air pressure parameters; it allows for quick, intuitive, and reliable force gradation control via manual knob operation, significantly improving the device's adaptability to various workpiece types and materials, as well as process safety. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of the moving reference block, fixed reference plate, and cylinder of the present invention.

[0019] Figure 3 This is a three-dimensional structural diagram of the sliding plate, slider, and planar moving frame components of the present invention.

[0020] Figure 4 This is a three-dimensional structural diagram of the limiting block, pre-tightening block, and telescopic rod components of the present invention.

[0021] Figure 5 This is a three-dimensional structural diagram of the planar movable frame of the present invention.

[0022] Figure 6 This is a three-dimensional structural diagram of the components of the present invention, such as the pressing plate, connecting rod, and rotating valve.

[0023] Figure 7 This is a three-dimensional structural diagram of the gas distribution frame and gas tube of the present invention.

[0024] Figure 8 This is a three-dimensional structural diagram of the gas distribution frame and rotary valve of the present invention.

[0025] Figure 9 This is a three-dimensional structural diagram of the distance adjustment rod, adjustment ring, and air tube components of the present invention.

[0026] The above-mentioned figures include the following reference numerals: 101_base, 102_screw, 103_moving reference block, 104_fixed reference plate, 105_cylinder one, 1051_sliding plate, 1061_slider, 1062_planar moving frame, 107_locking assembly, 1071_pre-tightening block, 1072_telescopic rod one, 1073_locking plate, 1074_limiting block, 108_clamping rod, 109_sliding cavity, 1091_air passage connection port, 110_telescopic rod two, 1101_piston head, 111_angle adjustment rod, 112_reset plate, 201_cylinder two, 202_pressing plate, 203_connecting rod, 204_gas distribution frame, 205_rotary valve, 206_air pipe, 301_distance adjustment rod, 302_adjusting ring. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. 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.

[0028] Example 1: A welding positioning device for processing vehicle engine brackets, such as Figures 1-9As shown, the system includes a base 101, with one top end serving as a support for the engine bracket. At least three screws 102, preferably five, are rotatably connected inside the base 101. A number of movable reference blocks 103, corresponding to the number of screws 102, are slidably connected to the base 101. The movable reference blocks 103 are threadedly connected to the screws 102. The movable reference blocks 103 can not only position a normally rectangular bracket, but also adjust the position of the movable reference blocks 103 to match the curved reference surface of the engine bracket when the reference surface is curved. Two fixed reference plates 104 are fixedly connected to the top of the base 101. A cylinder 105, symmetrically arranged along the base 101, is fixedly installed on the base 101. The cylinder 105 is placed horizontally. A sliding plate 1051 is slidably connected to the support end of the top of the base 101. The front end of 1051 is fixedly connected to the telescopic end of cylinder 105. Multiple sliders 1061 that can move along their length are slidably connected to the sliding plate 1051. The number of sliders 1061 is at least three, preferably four. A planar moving frame 1062 is slidably connected through each slider 1061. A sliding cavity 109 is provided in the planar moving frame 1062. A clamping rod 108 is slidably connected to each sliding cavity 109. A piston head 1101 is fixedly connected to one side of the clamping rod 108. The piston head 1101 is slidably connected to the sliding cavity 109. An air passage connection port 1091 for connecting the air supply equipment is provided at one end of the sliding cavity 109. A locking component 107 for fastening the slider 1061 and the planar moving frame 1062 is provided on the upper side of the slider 1061. A flexible clamping component for clamping the curved surface of the engine bracket is fixedly connected to one end of the clamping rod 108.

[0029] like Figure 3 and Figure 4 As shown, the locking assembly 107 includes a locking plate 1073 fixedly connected to one end of the top of the planar movable frame 1062. A pre-tightening block 1071 is slidably connected to one side of the upper part of the slider 1061. The pre-tightening block 1071 cooperates with the locking plate 1073. Under the influence of external pressure, the pre-tightening block 1071 moves toward the locking plate 1073 and presses against it. The static friction generated when they press against each other prevents the planar movable frame 1062 from shifting. A telescopic rod 1072 is fixedly connected to one side of the top of the pre-tightening block 1071. The telescopic rod 1072 is slidably connected to the slider 1061. A limiting block 1074 is fixedly connected to the other end of the telescopic rod 1072. The limiting block 1074 cooperates with the sliding plate 1051. Under the influence of external pressure, the limiting block 1074 moves toward the sliding plate 1051 and presses against it. The static friction generated when they press against each other prevents the slider 1061 from shifting.

[0030] like Figure 4As shown, the flexible clamping assembly includes a telescopic rod 110 fixed to one end of the clamping rod 108. An angle adjustment rod 111 is fixedly connected to the front end of the telescopic rod 110. A ball head is sleeved on the front end of the angle adjustment rod 111. The ball head can be deflected at any angle of 0-40° relative to the front end of the angle adjustment rod 111 to fit the curved surface of the engine bracket.

[0031] First, place the engine bracket to be welded between the movable reference block 103 and the fixed reference plate 104 on the base 101. Adjust the distance and position between each slider 1061 by moving it to align it with the position to be clamped at one end of the curved surface of the engine bracket. Then, start cylinder one 105. Cylinder one 105 retracts and drives the sliding plate 1051, slider 1061, planar moving frame 1062, locking assembly 107, preload block 1071, telescopic rod one 1072, locking plate 1073, limiting block 1074, clamping rod 108, telescopic rod two 110, piston head 1101, angle adjustment rod 111, cylinder two 201, and press... The pressure plate 202, connecting rod 203, gas distribution frame 204, rotary valve 205, and air pipe 206 move forward together. During the forward movement of the angle adjustment rod 111, it first contacts and adheres to the curved surface of the engine bracket. Then, it is blocked by the curved surface of the engine bracket. The angle adjustment rod 111, telescopic rod 110, clamping rod 108, piston head 1101, and locking plate 1073 stop moving forward. During the movement, the angle adjustment rod 111 is blocked by the curved surface of the engine bracket. The contact part of the angle adjustment rod 111 undergoes adaptive deflection, and the contact surface of the angle adjustment rod 111 thus adheres to the curved surface of the engine bracket, completing the step of adhering to the curved surface of the engine bracket.

[0032] Meanwhile, the retraction of cylinder 105 did not stop. When the planar moving frame 1062 was obstructed, cylinder 105 continued to pull the sliding plate 1051 forward, thereby driving components such as the pre-tightening block 1071, telescopic rod 1072, limiting block 1074, and cylinder 201 to move forward. The relative position of slider 1061 and planar moving frame 1062 changed. During the process of cylinder 105 driving the sliding plate 1051 to move forward, the angle adjustment rods 111 set on the sliding plate 1051 successively came into contact with the curved surface of the engine bracket. Finally, cylinder 105 completed the retraction. In summary, the preparatory work for clamping the engine bracket was completed.

[0033] Example 2: Based on Example 1, such as Figure 6 , Figure 7 and Figure 8As shown, it also includes a second cylinder 201, which is symmetrically arranged at both ends along the length of the sliding plate 1051, with the cylinders facing upwards. A pressing plate 202 is fixedly connected between the top of the telescopic ends of the symmetrically arranged cylinders 201. The pressing plate 202 is slidably connected to the sliding plate 1051. A gas distribution frame 204 is fixedly connected to the rear side of the top of the sliding plate 1051. The flow passage of the gas distribution frame 204 consists of four branch passages and one main passage, forming a tree-like branch. A rotary valve 205 is rotatably connected inside the main passage of the gas distribution frame 204. The rotary valve 205 is used to control the opening and closing of the flow passage within the gas distribution frame 204. A connecting rod 203 is rotatably connected to the front end of the rotary valve 205. The other end of the connecting rod 203 is rotatably connected to the pressing plate 202. An air pipe 206 is fixedly connected between the gas distribution frame 204 and the air passage connection port 1091. The number of air pipes 206 corresponds to the number of planar moving frames 1062. An air inlet connected to the gas supply equipment is provided at one end of the gas distribution frame 204. Gas enters the sliding chamber 109 through the gas distribution frame 204 and the air pipe 206 to push the clamping rod 108 to move.

[0034] Then, cylinder 201 is activated, and cylinder 201 quickly retracts, causing the pressing plate 202 to move downwards rapidly. The pressing plate 202 then pushes the limiting block 1074 downwards. Simultaneously, the pressing plate 202 pulls the connecting rod 203 downwards, causing the rotating valve 205 to rotate. During the downward movement of the limiting block 1074, the pressure applied by cylinder 201 is transmitted to the pre-tightening block 1071 through the telescopic rod 1072. The pre-tightening block 1071, under pressure, applies downward force to adhere to the locking plate 1073, preventing the planar moving frame 1062 from shifting. As the pressing plate 202 continues to descend, the telescopic rod 1072 is rapidly compressed. As the pressing plate 202 pushes the limiting block 1074 downwards until it is pressed against the sliding plate 1051, static friction is generated between the limiting block 1074 and the sliding plate 1051, thus preventing the limiting block 1074 from shifting. 4. The slider 1061 and the sliding plate 1051 shift, completing the final locking of the slider 1061 and the planar moving frame 1062. At this time, the rotary valve 205 rotates to the open state, and the gas slowly passes through the flow passage of the gas distribution frame 204. The gas is then sent to multiple gas pipes 206 through the flow passage, and finally transported into the sliding chamber 109 through the gas pipes 206. This pushes the piston head 1101 and the clamping rod 108 to move forward and begin to clamp the curved surface of the engine bracket. The telescopic rod 110 adapts to the force during the clamping process of the clamping rod 108 moving forward, flexibly clamping the curved surface of the engine bracket, completing the final positioning clamping before the engine bracket is welded. At the same time, through flexible clamping, when the material expands / contracts due to high temperature during the welding of the engine bracket, a small displacement is allowed to release some thermal stress and prevent material deformation.

[0035] Example 3: Based on Example 2, such as Figure 1 and Figure 2 As shown, it also includes a reset plate 112, which is fixedly connected to the rear end of the base 101 and is used to passively push the planar moving frame 1062 to reset.

[0036] After the welding of the engine bracket is completed, it is reset by the reverse working principle described above. Cylinder 105 pushes the sliding plate 1051, slider 1061 and planar moving frame 1062 to reset. During the process of each group of planar moving frames 1062 resetting to the rear, they successively contact the reset plate 112. The planar moving frame 1062 that contacts the engine bracket first has a shorter moving distance and stops moving when it contacts the reset plate 112 during the process of moving to the rear. The slider 1061 continues to reset to the rear. When all groups of planar moving frames 1062 have contacted the reset plate 112, the final reset is completed.

[0037] Example 4: Based on Example 3, such as Figure 4 and Figure 9 As shown, it also includes a distance adjustment rod 301, which is fixedly connected to the rear end of the clamping rod 108. The distance adjustment rod 301 is slidably connected to the planar moving frame 1062 through the sliding cavity 109. The distance adjustment rod 301 is provided with an adjustment thread, and an adjustment ring 302 for limiting the movement distance of the distance adjustment rod 301 is connected to the adjustment thread.

[0038] To prevent deformation of thin-walled sections of some types of brackets when subjected to strong clamping forces, the adjusting ring 302 can be rotated to move it closer to the rear end face of the planar moving frame 1062, thereby shortening the forward pushing distance of the clamping rod 108 and reducing the clamping force of the angle adjusting rod 111 on the engine bracket.

[0039] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A welding positioning device for processing a vehicle engine bracket, comprising a base (101), characterized in that, The top end of the base (101) is the bearing end supporting the engine bracket. At least three screws (102) are rotatably connected inside the base (101). A movable reference block (103) is slidably connected to the base (101). The movable reference block (103) is threadedly connected to the screws (102). A fixed reference plate (104) is fixedly connected to the top of the base (101). A cylinder (105) is fixedly installed on the base (101) and symmetrically arranged along the base (101). A sliding plate (1051) is slidably connected to the bearing end of the base (101). One end of the sliding plate (1051) is fixedly connected to the telescopic end of the cylinder (105). Multiple sliders (1051) that can move along its length direction are slidably connected to the sliding plate (1051). 61), each slider (1061) is slidably connected to a planar moving frame (1062), the planar moving frame (1062) is provided with a sliding cavity (109), a clamping rod (108) is slidably connected in the sliding cavity (109), a piston head (1101) is fixedly connected to one side of the clamping rod (108), the piston head (1101) is slidably connected to the sliding cavity (109), one end of the sliding cavity (109) is provided with an air passage connection port (1091) for connecting the air supply equipment, one side of the slider (1061) is provided with a locking component (107) for fastening the slider (1061) and the planar moving frame (1062), one end of the clamping rod (108) is fixedly connected with a flexible clamping component for clamping the curved surface of the engine bracket; The locking assembly (107) includes a locking plate (1073) fixedly connected to one end of the planar movable frame (1062). A preload block (1071) is slidably connected to one side of the slider (1061). The preload block (1071) cooperates with the locking plate (1073). Under the influence of external pressure, the preload block (1071) moves towards the locking plate (1073) and presses against it. The static friction generated when they press against each other prevents the planar movable frame (1062) from shifting. The preload block (1071) is far from the locking plate (1073). A telescopic rod (1072) is fixedly connected to one side of the locking plate (1073). The telescopic rod (1072) is slidably connected to the slider (1061). A limiting block (1074) is fixedly connected to the other end of the telescopic rod (1072). The limiting block (1074) cooperates with the sliding plate (1051). The limiting block (1074) moves towards the sliding plate (1051) and presses against it under external pressure. The static friction generated when they press against each other prevents the slider (1061) from shifting. The flexible clamping assembly includes a telescopic rod two (110) fixed to one end of the clamping rod (108). An angle adjustment rod (111) is fixedly connected to the telescopic end of the telescopic rod two (110). A ball head is sleeved on the end of the angle adjustment rod (111) away from the clamping rod (108). The ball head can be deflected at any angle relative to one end of the angle adjustment rod (111). In use, the cylinder (105) drives the angle adjustment rods (111) set on the sliding plate (1051) to successively contact and fit with the curved surface of the engine bracket. The angle adjustment rods (111) deflect independently in the initial contact stage to first complete the adaptation to the shape of the irregular curved surface. Then, after the locking assembly (107) is fixed in position, all clamping rods (108) are driven to move forward synchronously by a unified air source to ensure that the same clamping force is applied to each clamping point.

2. A welding positioning device for processing a vehicle engine bracket according to claim 1, characterized in that, The number of sliders (1061) is at least three.

3. A welding positioning device for processing a vehicle engine bracket according to claim 2, characterized in that, It also includes a reset plate (112), which is fixedly connected to the end of the base (101) opposite to the moving reference block (103) and is used to passively push the planar moving frame (1062) to reset.

4. A welding positioning device for processing a vehicle engine bracket according to claim 3, characterized in that, It also includes a second cylinder (201), which is symmetrically arranged at both ends along the length of the sliding plate (1051). A pressing plate (202) is fixedly connected between the symmetrically arranged second cylinders (201). The pressing plate (202) is slidably connected to the sliding plate (1051). A gas distribution frame (204) is fixedly connected to one end of the sliding plate (1051). A rotary valve (205) is rotatably connected inside the gas distribution frame (204) to control the opening and closing of the flow passage inside the gas distribution frame (204). 05) A connecting rod (203) is rotatably connected to one end of the gas distribution frame (204), and the other end of the connecting rod (203) is rotatably connected to the pressing plate (202). A gas pipe (206) is fixedly connected between the gas distribution frame (204) and the gas channel connection port (1091). An air inlet connected to the gas supply equipment is provided at one end of the gas distribution frame (204). High-pressure gas enters the sliding cavity (109) through the gas distribution frame (204) and the gas pipe (206) to push the clamping rod (108) to move.

5. A welding positioning device for processing a vehicle engine bracket according to claim 4, characterized in that, The number of tracheas (206) corresponds to the number of planar moving frames (1062).

6. A welding positioning device for processing a vehicle engine bracket according to claim 5, characterized in that, It also includes a distance adjustment rod (301), which is fixedly connected to one end of the clamping rod (108). The distance adjustment rod (301) is slidably connected to the planar moving frame (1062). The distance adjustment rod (301) is provided with an adjustment thread, and an adjustment ring (302) for limiting the movement distance of the distance adjustment rod (301) is connected to the adjustment thread.

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