An automatic welding tool device for a U-shaped support of an electric vehicle accessory

Abstract

The application discloses an automatic welding tool device for an electric vehicle accessory U-shaped support, relates to the technical field of U-shaped support welding, and comprises a hydraulic control mechanism arranged on the outer wall of an adjustable contraction mechanism, wherein the hydraulic control mechanism is provided with a plurality of output ends, the output ends of the hydraulic control mechanism are used for controlling the adjustable contraction mechanism, a flexible support mechanism is arranged on the adjustable contraction mechanism, the middle part of the flexible support mechanism is arranged as an expansion end, and the two ends of the flexible support mechanism are respectively arranged as expansion and shrinkage ends. The flexible support mechanism is arranged on the inner side of the adjustable contraction mechanism, when the two sliding cavity blocks are contracted towards each other, the middle bellows is compressed, the gas in the bellows enters the air bags at the two ends through the air pipe, and the air bags are expanded to be flexibly supported and attached to the side wall of the U-shaped support.

Description

Technical Field

[0001] This invention relates to the field of U-shaped bracket welding technology, specifically to an automated welding fixture for U-shaped brackets used in electric vehicle parts. Background Technology

[0002] In the manufacturing process of electric vehicles, the U-shaped bracket, as a key structural component in the frame system (such as the shock absorber bracket, swingarm bracket, and seat bracket), directly affects the safety and service life of the entire vehicle due to its welding quality. Currently, the U-shaped bracket is typically welded from three sections of round rods, forming multiple welding points between its ends and the middle. During the welding process, the U-shaped bracket to be welded needs to be positioned and reliably clamped.

[0003] However, existing welding fixtures still have shortcomings in practical use: Existing tooling clamping methods are mostly rigid clamping, which applies hard clamping force to the U-shaped bracket through cylinders or manual clamps. For U-shaped brackets formed by bending round rods, the clamping surface of rigid clamping is prone to producing indentations on the uneven workpiece surface, and may even cause local surface deformation of the round rod, thus affecting the welding quality.

[0004] To address the aforementioned problems, the inventors have proposed an automated welding fixture for U-shaped brackets used in electric vehicle parts. Summary of the Invention

[0005] To address the problem that rigid clamping surfaces can easily leave indentations on uneven workpiece surfaces, and even cause localized surface deformation of round rods, the present invention aims to provide an automated welding fixture for U-shaped brackets used in electric vehicle parts.

[0006] To solve the above technical problems, the present invention adopts the following technical solution: an automated welding fixture for U-shaped brackets of electric vehicle parts, including a base and a welding robotic arm installed at one end of the base, an angle adjustment mechanism is provided at one end of the base, an adjustable retraction mechanism is connected to the top of the angle adjustment mechanism, and a U-shaped bracket is placed on the adjustable retraction mechanism. The adjustable shrink mechanism has a symmetrical telescopic structure in the middle and symmetrical rotational structures at both ends. The adjustable shrink mechanism is provided with a hydraulic control mechanism on its outer wall. The hydraulic control mechanism is provided with multiple output ends, and the output ends of the hydraulic control mechanism control the adjustable shrink mechanism. The adjustable contraction mechanism is provided with a flexible support mechanism, the middle part of which is set as a telescopic end, and the two ends of which are respectively set as expansion and contraction ends; The adjustable shrinking mechanism has a tightening mechanism and a clamping structure installed on both sides of its outer wall. The tightening mechanism clamps the end of the U-shaped bracket, and the clamping structure clamps the middle of the U-shaped bracket.

[0007] Preferably, the U-shaped bracket is welded from three sections of round rod, and welding points are provided between the two ends and the middle of the U-shaped bracket.

[0008] Preferably, the angle adjustment mechanism includes a turntable frame and a servo motor for driving the turntable frame. The servo motor is installed in the base, the turntable frame is rotatably connected to the top of one end of the base, and the output shaft of the servo motor is connected to the turntable frame.

[0009] Preferably, the top of the turntable frame is configured as a vertical plate, and a driven gear ring is rotatably connected to the top of the turntable frame. A drive gear meshes on the outer wall of the driven gear ring, and the drive gear is rotatably connected to the outer wall of the vertical plate. A drive motor is installed on the outer wall of the vertical plate, and the output shaft of the drive motor is connected to the drive gear. A connecting rod is fixedly connected to the inner wall of the driven gear ring, and the connecting rod is connected to an adjustable retraction mechanism.

[0010] Preferably, the adjustable retraction mechanism includes symmetrical connecting rods for connecting to the connecting rods, with sliding cavity blocks slidably connected to both ends of the symmetrical connecting rods, and a rectangular frame set on one side of the outer wall of the sliding cavity block; the telescopic end of the flexible support mechanism is disposed between the two sliding cavity blocks. An arc-shaped corner frame is connected to the outer wall of the rectangular frame, and a rotating frame is rotatably connected to the outer wall of the rectangular frame. The interior of the arc-shaped corner frame is set as a cavity, and one end of the rotating frame is slidably connected to the interior of the cavity. The hydraulic control mechanism is set at the bottom of the symmetrical connecting rod and the sliding cavity block and extends to both ends. Several sets of tightening mechanisms are arranged on the rotating frame, and the clamping structure is arranged on the outer wall of the sliding cavity block.

[0011] Preferably, the hydraulic control mechanism includes a cylinder connected to the outer wall of the bottom of the sliding cavity block, a first piston rod slidably connected inside the cylinder, the output end of the first piston rod being connected to the bottom of the symmetrical connecting rod, the other end of the cylinder being connected to a first connecting pipe, one end of the first connecting pipe being connected to a three-way valve, and one end of the three-way valve being provided with an oil inlet. The other two ports of the three-way valve are respectively connected to a second connecting pipe, one end of which is connected to the bottom of the arc-shaped bracket.

[0012] Preferably, the flexible support mechanism includes a corrugated pipe disposed between two sliding chamber blocks, with air pipes connected to both ends of the corrugated pipe, and an air bladder connected to one end of each air pipe. The air bladder is disposed inside the rotating frame, and the outer wall of the air bladder is made of wear-resistant soft rubber.

[0013] Preferably, the tightening mechanism includes an oil cylinder connected to the outer wall of the bottom of the rotating frame, a fourth connecting pipe connected to the port of the three-way valve, the fourth connecting pipe being connected to the top of the oil cylinder, a sliding plate slidably connected to the inner wall of the oil cylinder, a cable connected to the upper surface of the sliding plate, a first spring being provided between the sliding plate and the oil cylinder, and the two ends of the cable being connected to the two sliding plates respectively, forming a U-shaped structure for tightening cooperation with the rotating frame.

[0014] Preferably, one end of the fourth connecting pipe is connected to the third connecting pipe, the clamping structure includes an oil shell connected to one end of the third connecting pipe, the oil shell is connected to the outer wall of the sliding cavity block, a second piston rod is slidably connected to the inner wall of the oil shell, a second spring is provided between the second piston rod and the oil shell, and a clamping block is fixedly connected to the output end of the second piston rod.

[0015] Preferably, the outer wall of the clamping block is provided with an arc-shaped surface, and a rectangular recess is formed on the outer wall of the arc-shaped surface.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention provides a flexible support mechanism on the inner side of the adjustable shrinkage mechanism. When the sliding cavities on both sides shrink towards each other, the bellows in the middle is compressed, and the gas inside enters the air bladders at both ends through the air pipe. After the air bladders expand, they provide flexible support and fit from the side wall of the U-shaped bracket. This can adapt to the uneven contour of the curved inner side of the U-shaped bracket, avoid rigid contact damage to the workpiece surface, and absorb the stress generated by the thermal expansion of the workpiece during the welding process by utilizing the compressibility of the air bladders, preventing the workpiece from being deformed by pressure.

[0017] 2. The present invention sets an angle adjustment mechanism between the base and the adjustable retraction mechanism. The turntable frame is driven by a servo motor to achieve horizontal angle adjustment. The connecting rod and the adjustable retraction mechanism are driven by the meshing transmission of the drive motor, drive gear and driven gear ring to achieve vertical adjustment. During the welding process, the angle adjustment mechanism can adjust the posture of the U-shaped bracket according to the welding path of the welding robot arm so that the weld is always in the optimal welding position.

[0018] 3. The present invention features an adjustable shrinkage mechanism, in which the symmetrical connecting rod and sliding cavity block in the middle form a symmetrical telescopic structure. The distance between the sliding cavity blocks on both sides can be adjusted by hydraulic drive, thereby adapting to U-shaped supports with different spans. The rotating frame at both ends of the adjustable shrinkage mechanism and the arc corner frame form a symmetrical rotating structure, which can rotate to adapt to the curvature of the U-shaped support, so that the tooling can fit tightly to U-shaped supports with different radii of curvature. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the angle adjustment mechanism of the present invention.

[0022] Figure 3 This is a schematic diagram of the hydraulic control mechanism and flexible support mechanism of the present invention.

[0023] Figure 4 This is a schematic diagram of the hydraulic control mechanism of the present invention.

[0024] Figure 5 This is a schematic diagram of the adjustable shrinkage mechanism of the present invention.

[0025] Figure 6 This is a schematic diagram of the flexible support mechanism of the present invention.

[0026] Figure 7 This is a schematic diagram of the clamping structure of the present invention.

[0027] Figure 8 This is a schematic diagram of the tightening mechanism of the present invention.

[0028] In the diagram: 1. Base; 2. Welding robotic arm; 3. Angle adjustment mechanism; 31. Servo motor; 32. Turntable frame; 33. Drive motor; 34. Drive gear; 35. Driven gear ring; 36. Connecting rod; 4. Hydraulic control mechanism; 41. Cylinder; 42. First piston rod; 43. First connecting pipe; 44. Three-way valve; 45. Oil inlet; 46. Second connecting pipe; 47. Third connecting pipe; 48. Fourth connecting pipe; 5. Flexible Support mechanism; 51. Corrugated pipe; 52. Air tube; 53. Airbag; 6. U-shaped bracket; 7. Adjustable retraction mechanism; 71. Symmetrical connecting rod; 72. Sliding cavity block; 72. Rectangular frame; 73. Rotating frame; 74. Arc-shaped corner frame; 8. Tightening mechanism; 81. Oil cylinder; 82. First spring; 83. Sliding plate; 84. Cable; 9. Clamping structure; 91. Oil shell; 92. Second piston rod; 93. Second spring; 94. Clamping block. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0030] Example 1 like Figure 1 - Figure 8 As shown, the present invention provides an automated welding fixture for U-shaped brackets of electric vehicle parts, including a base 1 and a welding robotic arm 2 installed at one end of the base 1. An angle adjustment mechanism 3 is provided at one end of the base 1, and an adjustable retraction mechanism 7 is connected to the top of the angle adjustment mechanism 3. A U-shaped bracket 6 is placed on the adjustable retraction mechanism 7. The adjustable shrink mechanism 7 has a symmetrical telescopic structure in the middle and a symmetrical rotating structure at both ends. A hydraulic control mechanism 4 is provided on the outer wall of the adjustable shrink mechanism 7. The hydraulic control mechanism 4 is provided with multiple output ends, and the output ends of the hydraulic control mechanism 4 control the adjustable shrink mechanism 7. The adjustable shrinking mechanism 7 is provided with a flexible support mechanism 5. The middle part of the flexible support mechanism 5 is set as the telescopic end, and the two ends of the flexible support mechanism 5 are respectively set as the expansion and contraction ends. A tightening mechanism 8 and a clamping structure 9 are respectively installed on both sides of the outer wall of the adjustable shrinking mechanism 7. The tightening mechanism 8 clamps the end of the U-shaped bracket 6, and the clamping structure 9 clamps the middle of the U-shaped bracket 6. The purpose of this setup is that the base 1 provides the mounting foundation for the entire device, and the welding robotic arm 2 is mounted on one end of the base 1 to perform welding operations.

[0031] An angle adjustment mechanism 3 is located at one end of the base 1 and is used to drive the adjustable retraction mechanism 7 to adjust the angle in the horizontal and vertical directions.

[0032] The adjustable shrink mechanism 7 has a symmetrical telescopic structure in the middle to adjust the overall width to adapt to U-shaped brackets 6 with different spans, and a symmetrical rotating structure at both ends to adjust the rotation angle to adapt to U-shaped brackets 6 with different curvatures.

[0033] The hydraulic control mechanism 4 is located on the outer wall of the adjustable shrink mechanism 7 and has multiple output ends, which synchronously drive the extension and rotation of the adjustable shrink mechanism 7.

[0034] The flexible support mechanism 5 is installed on the adjustable contraction mechanism 7. The corrugated pipe 51 in the middle generates an air source by extending and contracting, which drives the airbags 53 at both ends to expand or contract, thereby achieving flexible support for the inner side of the U-shaped bracket 6.

[0035] The tightening mechanism 8 and the clamping structure 9 are respectively installed on both sides of the outer wall of the adjustable shrinking mechanism 7. The tightening mechanism 8 clamps the end of the U-shaped bracket 6, and the clamping structure 9 clamps the middle of the U-shaped bracket 6.

[0036] Example 2 like Figures 1-8 As shown, the U-shaped bracket 6 is welded from three sections of round rods. Welding points are provided between the two ends and the middle of the U-shaped bracket 6. The welding assembly of the U-shaped bracket 6 is used for shock absorber brackets, flat fork brackets, and seat cushion brackets.

[0037] The angle adjustment mechanism 3 includes a turntable frame 32 and a servo motor 31 for driving the turntable frame 32. The servo motor 31 is installed in the base 1, and the turntable frame 32 is rotatably connected to the top of one end of the base 1. The output shaft of the servo motor 31 is connected to the turntable frame 32. The purpose of this arrangement is that the servo motor 31 is installed inside the base 1, and the output shaft of the servo motor 31 drives the turntable frame 32 on the top of the base 1 to rotate around the vertical axis, thereby achieving 360° angle adjustment in the horizontal direction.

[0038] The top of the turntable frame 32 is set as a vertical plate, and a driven gear ring 35 is rotatably connected to the top of the turntable frame 32. A drive gear 34 is meshed on the outer wall of the driven gear ring 35. The drive gear 34 is rotatably connected to the outer wall of the vertical plate. A drive motor 33 is installed on the outer wall of the vertical plate. The output shaft of the drive motor 33 is connected to the drive gear 34. A connecting rod 36 is fixedly connected to the inner wall of the driven gear ring 35. The connecting rod 36 is connected to the adjustable retraction mechanism 7. The purpose of this configuration is that the output shaft of the drive motor 33 drives the drive gear 34 to rotate, and through the meshing transmission between the drive gear 34 and the driven gear ring 35, the driven gear ring 35 and the connecting rod 36 drive the adjustable retraction mechanism 7 to rotate in a circle, thereby achieving vertical angle adjustment.

[0039] The adjustable retraction mechanism 7 includes a symmetrical connecting rod 71 for connecting to the connecting rod 36. The two ends of the symmetrical connecting rod 71 are respectively slidably connected to sliding cavity blocks 72. A rectangular frame 720 is set on one side of the outer wall of the sliding cavity block 72. The telescopic end of the flexible support mechanism 5 is set between the two sliding cavity blocks 72. An arc-shaped corner bracket 74 is connected to the outer wall of the rectangular frame 720, and a rotating frame 73 is rotatably connected to the outer wall of the rectangular frame 720. The interior of the arc-shaped corner bracket 74 is set as a cavity, and one end of the rotating frame 73 is slidably connected to the interior of the cavity. The hydraulic control mechanism 4 is set at the bottom of the symmetrical connecting rod 71 and the sliding cavity block 72 and extends to both ends. Several sets of tightening mechanisms 8 are set on the rotating frame 73, and clamping structures 9 are set on the outer wall of the sliding cavity block 72; The purpose of this arrangement is that the sliding cavity block 72 is slidably connected to both ends of the symmetrical connecting rod 71, and can slide along the symmetrical connecting rod 71 in opposite directions to adjust the spacing. The rectangular frame 720 is set on the outer wall of the sliding cavity block 72 to connect the arc-shaped corner frame 74 and the rotating frame 73. The rectangular frame 720 provides a certain welding space to facilitate the welding head of the welding robot arm 2 to weld the welding point.

[0040] The arc-shaped corner bracket 74 has a cavity inside, and one end of the rotating bracket 73 is slidably connected in the cavity. It can slide in the cavity by hydraulic drive, so that the rotating bracket 73 rotates around the rectangular frame 720, thereby achieving adaptive fitting to the curvature of the U-shaped bracket 6.

[0041] The hydraulic control mechanism 4 includes a cylinder 41 connected to the bottom outer wall of the sliding cavity block 72. A first piston rod 42 is slidably connected inside the cylinder 41. The output end of the first piston rod 42 is connected to the bottom of the symmetrical connecting rod 71. The other end of the cylinder 41 is connected to a first connecting pipe 43. One end of the first connecting pipe 43 is connected to a three-way valve 44. One end of the three-way valve 44 is provided with an oil inlet 45. The other two ports of the three-way valve 44 are respectively connected to the second connecting pipe 46, and one end of the second connecting pipe 46 is connected to the bottom of the arc-shaped bracket 74; The purpose of this design is that after the hydraulic oil enters the cylinder 41 through the first connecting pipe 43, it pushes the first piston rod 42 to extend, so that the symmetrical connecting rod 71 and the sliding cavity block 72 slide relative to each other to achieve contraction.

[0042] The inlet 45 of the three-way valve 44 is connected to hydraulic oil, and the hydraulic oil is diverted to the first connecting pipe 43 and the second connecting pipe 46. The second connecting pipe 46 is connected to the bottom of the arc-shaped bracket 74, driving the rotating frame 73 to rotate.

[0043] The flexible support mechanism 5 includes a bellows 51 disposed between two sliding cavity blocks 72. Both ends of the bellows 51 are connected to air pipes 52, and one end of the air pipes 52 is connected to an airbag 53. The airbag 53 is disposed inside the rotating frame 73, and the outer wall of the airbag 53 is made of wear-resistant soft rubber. The purpose of this arrangement is that the bellows 51 is positioned between the two sliding chamber blocks 72. When the sliding chamber blocks 72 contract towards each other, the bellows 51 is compressed. The gas inside the bellows 51 enters the airbag 53 through the air pipe 52. After the airbag 53 expands, it provides flexible support from the inner wall of the U-shaped bracket 6. The outer wall of the airbag 53 is made of wear-resistant soft rubber, which ensures both fit and prevents damage to the workpiece surface.

[0044] The tightening mechanism 8 includes an oil cylinder 81 connected to the bottom outer wall of the rotating frame 73, a fourth connecting pipe 48 connected to the port of the three-way valve 44, the fourth connecting pipe 48 being connected to the top of the oil cylinder 81, a sliding plate 83 slidably connected to the inner wall of the oil cylinder 81, a cable 84 connected to the upper surface of the sliding plate 83, a first spring 82 being provided between the sliding plate 83 and the oil cylinder 81, and the two ends of the cable 84 being connected to the two sliding plates 83 respectively, forming a U-shaped structure for tightening cooperation with the rotating frame 73; The purpose of this design is that after the hydraulic oil enters the oil cylinder 81, it pushes the sliding plate 83 downward, compresses the first spring 82, and causes the cable 84 to tighten. The two ends of the cable 84 are respectively connected to the two sliding plates 83 to form a U-shaped structure. When tightening, an inward clamping force is applied to the end of the U-shaped bracket 6. The first spring 82 provides elastic buffering during welding thermal expansion and resets after cooling to maintain the tightening force.

[0045] One end of the fourth connecting pipe 48 is connected to the third connecting pipe 47. The clamping structure 9 includes an oil shell 91 that is connected to one end of the third connecting pipe 47. The oil shell 91 is connected to the outer wall of the sliding cavity block 72. A second piston rod 92 is slidably connected to the inner wall of the oil shell 91. A second spring 93 is provided between the second piston rod 92 and the oil shell 91. A clamping block 94 is fixedly connected to the output end of the second piston rod 92. The purpose of this design is that after the hydraulic oil enters the oil tank 91, it pushes the second piston rod 92 to extend, compressing the second spring 93, which in turn causes the clamping block 94 to clamp the middle of the U-shaped bracket 6 from the outside. The second spring 93 also provides elastic cushioning during welding thermal expansion and returns to its original position after cooling to maintain the clamping force.

[0046] The outer wall of the clamping block 94 is provided with an arc-shaped surface, and a rectangular recess is provided on the outer wall of the arc-shaped surface; The purpose of this design is that the arc-shaped surface on the outer wall of the clamping block 94 is used to form a surface contact with the outer wall of the round rod of the U-shaped bracket 6, thereby increasing the contact area and reducing the contact stress. The rectangular recess on the arc-shaped surface is used to increase the friction coefficient and to clamp the U-shaped bracket 6 with the rectangular outer wall, preventing the U-shaped bracket 6 from axially moving or rotating during the welding process.

[0047] Working principle: Before welding the U-shaped bracket 6, the round or rectangular rod to be welded is placed on the adjustable shrink mechanism 7 and the flexible support mechanism 5; Then, an external hydraulic pump is introduced through the oil inlet 45 to control the hydraulic volume inside the hydraulic control mechanism 4. The three-way valve 44 guides and controls the inflow of hydraulic oil, and regulates the flexible support mechanism 5, the adjustable retraction mechanism 7 and the clamping structure 9 respectively. During the adjustment process, hydraulic oil enters the cylinder 41 through the first connecting pipe 43 and pushes the first piston rod 42 to extend, causing the symmetrical connecting rod 71 and the sliding cavity block 72 to slide relative to each other and retract, which is used to adapt to the span distance of the U-shaped bracket 6. Then, the hydraulic oil is diverted to the first connecting pipe 43 and the second connecting pipe 46 through the three-way valve 44. The second connecting pipe 46 is connected to the bottom of the arc-shaped corner bracket 74, driving the rotating frame 73 to rotate, thereby adapting to the inclination of the end of the U-shaped bracket 6 and fitting together. The bellows 51 is positioned between the two sliding chamber blocks 72. When the sliding chamber blocks 72 contract towards each other, the bellows 51 is compressed. The gas inside the bellows 51 enters the airbag 53 through the air tube 52. After the airbag 53 expands, it provides flexible support from the inner wall of the U-shaped bracket 6. After the hydraulic oil enters the oil cylinder 81, it pushes the sliding plate 83 downward, compresses the first spring 82, and causes the cable 84 to tighten. The two ends of the cable 84 are respectively connected to the two sliding plates 83 to form a U-shaped structure. When tightening, an inward clamping force is applied to the end of the U-shaped bracket 6. After the hydraulic oil enters the oil tank 91, it pushes the second piston rod 92 to extend, compresses the second spring 93, and drives the clamping block 94 to clamp the middle part of the U-shaped bracket 6 from the outside, thereby achieving clamping of the three sections of the U-shaped bracket 6. During this process, it adapts to the different spans of the U-shaped bracket 6, the different inclinations of the ends of the U-shaped bracket 6 for close clamping, and the airbag 53 adapts to the uneven surface and existing curvature of the outer wall of the U-shaped bracket 6.

[0048] All standard mechanical parts used in this invention can be purchased commercially, and irregularly shaped parts can be custom-made according to the description and drawings. The specific mechanical connection methods for each part can also employ conventional methods such as bolts, rivets, and welding, which are already well-established in the prior art. For the motors and welding robotic arms involved in this invention, and some mechanical parts or various electronic components involving circuits, the related circuit connections adopt conventional circuit topologies and control principles in the prior art. The corresponding circuit models and operating logic are clearly understood and skillfully applied by those skilled in the art, and will not be detailed here.

[0049] The standard mechanical parts used in this invention, including but not limited to fasteners, gears, motors, and welding robotic arms, are all commercially available standard products known in the relevant technical field and can be directly purchased from market channels. Irregularly shaped parts can be custom-made according to the structural descriptions in this specification and accompanying drawings.

[0050] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An automated welding fixture for U-shaped brackets of electric vehicle parts, comprising a base (1) and a welding robotic arm (2) mounted on one end of the base (1), characterized in that: An angle adjustment mechanism (3) is provided at one end of the base (1), and an adjustable shrink mechanism (7) is connected to the top of the angle adjustment mechanism (3). A U-shaped bracket (6) is placed on the adjustable shrink mechanism (7). The adjustable shrink mechanism (7) has a symmetrical telescopic structure in the middle and a symmetrical rotation structure at both ends. The adjustable shrink mechanism (7) is provided with a hydraulic control mechanism (4) on its outer wall. The hydraulic control mechanism (4) is provided with multiple output ends. The output ends of the hydraulic control mechanism (4) control the adjustable shrink mechanism (7). The adjustable shrinking mechanism (7) is provided with a flexible support mechanism (5), the middle part of the flexible support mechanism (5) is set as a telescopic end, and the two ends of the flexible support mechanism (5) are respectively set as expansion and contraction ends; The adjustable shrinking mechanism (7) has a tightening mechanism (8) and a clamping structure (9) installed on both sides of its outer wall. The tightening mechanism (8) clamps the end of the U-shaped bracket (6), and the clamping structure (9) clamps the middle of the U-shaped bracket (6).

2. The automated welding fixture for U-shaped brackets of electric vehicle parts as described in claim 1, characterized in that, The U-shaped bracket (6) is welded from three sections of round rods, and welding points are provided between the two ends and the middle of the U-shaped bracket (6).

3. The automated welding fixture for U-shaped brackets of electric vehicle parts as described in claim 2, characterized in that, The angle adjustment mechanism (3) includes a turntable frame (32) and a servo motor (31) for driving the turntable frame (32). The servo motor (31) is installed in the base (1). The turntable frame (32) is rotatably connected to the top of one end of the base (1). The output shaft of the servo motor (31) is connected to the turntable frame (32).

4. The automated welding fixture for U-shaped brackets of electric vehicle parts as described in claim 3, characterized in that, The top of the turntable frame (32) is configured as a vertical plate. A driven gear ring (35) is rotatably connected to the top of the turntable frame (32). A drive gear (34) meshes on the outer wall of the driven gear ring (35). The drive gear (34) is rotatably connected to the outer wall of the vertical plate. A drive motor (33) is installed on the outer wall of the vertical plate. The output shaft of the drive motor (33) is connected to the drive gear (34). A connecting rod (36) is fixedly connected to the inner wall of the driven gear ring (35). The connecting rod (36) is connected to the adjustable retraction mechanism (7).

5. The automated welding fixture for U-shaped brackets of electric vehicle parts as described in claim 4, characterized in that, The adjustable retraction mechanism (7) includes a symmetrical connecting rod (71) for connecting to the connecting rod (36). The two ends of the symmetrical connecting rod (71) are respectively slidably connected to sliding cavity blocks (72). A rectangular frame (720) is set on one side of the outer wall of the sliding cavity block (72). The telescopic end of the flexible support mechanism (5) is set between the two sliding cavity blocks (72). An arc-shaped corner bracket (74) is connected to the outer wall of the rectangular frame (720), and a rotating frame (73) is rotatably connected to the outer wall of the rectangular frame (720). The interior of the arc-shaped corner bracket (74) is set as a cavity, and one end of the rotating frame (73) is slidably connected to the interior of the cavity. The hydraulic control mechanism (4) is set at the bottom of the symmetrical connecting rod (71) and the sliding cavity block (72) and extends to both ends. Several sets of tightening mechanisms (8) are arranged on the rotating frame (73), and the clamping structure (9) is arranged on the outer wall of the sliding cavity block (72).

6. The automated welding fixture for U-shaped brackets of electric vehicle parts as described in claim 5, characterized in that, The hydraulic control mechanism (4) includes a cylinder (41) connected to the bottom outer wall of the sliding cavity block (72). A first piston rod (42) is slidably connected inside the cylinder (41). The output end of the first piston rod (42) is connected to the bottom of the symmetrical connecting rod (71). The other end of the cylinder (41) is connected to a first connecting pipe (43). One end of the first connecting pipe (43) is connected to a three-way valve (44). One end of the three-way valve (44) is provided with an oil inlet (45). The other two ports of the three-way valve (44) are respectively connected to the second connecting pipe (46), and one end of the second connecting pipe (46) is connected to the bottom of the arc-shaped bracket (74).

7. The automated welding fixture for U-shaped brackets of electric vehicle parts as described in claim 6, characterized in that, The flexible support mechanism (5) includes a bellows (51) disposed between two sliding cavity blocks (72), with air pipes (52) connected to both ends of the bellows (51), and an airbag (53) connected to one end of the air pipe (52). The airbag (53) is disposed inside the rotating frame (73), and the outer wall of the airbag (53) is made of wear-resistant soft rubber.

8. The automated welding fixture for U-shaped brackets of electric vehicle parts as described in claim 7, characterized in that, The tightening mechanism (8) includes an oil cylinder (81) connected to the bottom outer wall of the rotating frame (73). A fourth connecting pipe (48) is connected to the port of the three-way valve (44). The fourth connecting pipe (48) is connected to the top of the oil cylinder (81). A sliding plate (83) is slidably connected to the inner wall of the oil cylinder (81). A cable (84) is connected to the upper surface of the sliding plate (83). A first spring (82) is provided between the sliding plate (83) and the oil cylinder (81). The two ends of the cable (84) are respectively connected to the two sliding plates (83) to form a U-shaped structure for tightening cooperation with the rotating frame (73).

9. The automated welding fixture for U-shaped brackets of electric vehicle parts as described in claim 8, characterized in that, One end of the fourth connecting pipe (48) is connected to the third connecting pipe (47). The clamping structure (9) includes an oil shell (91) connected to one end of the third connecting pipe (47). The oil shell (91) is connected to the outer wall of the sliding cavity block (72). A second piston rod (92) is slidably connected to the inner wall of the oil shell (91). A second spring (93) is provided between the second piston rod (92) and the oil shell (91). A clamping block (94) is fixedly connected to the output end of the second piston rod (92).

10. The automated welding fixture for U-shaped brackets of electric vehicle parts as described in claim 9, characterized in that, The outer wall of the clamping block (94) is provided with an arc-shaped surface, and a rectangular recess is provided on the outer wall of the arc-shaped surface.

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