A positioning welding fixture

Abstract

The present invention discloses a positioning welding fixture, and relates to the technical field of welding fixtures. The present invention comprises a base table, wherein semi-arc frames are fixed on both sides of the top surface of the base table, vertical columns are fixed on the top surface of the base table, an L-shaped base plate is fixed on the top surface of the vertical columns, a horizontal plate is fixed on the top of the outer wall of the vertical column, magnetic blocks are fixed on the left and right sides of the horizontal plate, two circular holes are arranged on the front side of the horizontal plate, sliding grooves are arranged on both sides of the front side of the horizontal plate, fork rods are slidably installed on the inner walls of the two circular holes of the horizontal plate, and an electric telescopic rod is fixedly installed on the back side of the fork rod. The present invention presses the swing arm workpiece toward the middle by the round head to reduce the gap between the swing arm workpiece and the T-shaped workpiece, thereby avoiding the problem of poor welding quality caused by a large gap when the welding fixture is used to fix the lower swing arm of the automobile.

Description

[0001] This application is a divisional application with application number 2024105239421, application date April 29, 2024, and invention name “A positioning welding and fixing device for a lower control arm of an automobile”. Technical Field

[0002] The invention relates to the technical field of welding fixtures, in particular to a positioning welding fixture. Background Art

[0003] The automobile lower arm positioning welding fixture is a device used to position and fix the lower arm during the automobile production process for welding process, ensuring that the lower arm maintains a stable position during the welding process, thereby ensuring the welding quality and product safety.

[0004] Patent number CN213003785U discloses a vehicle lower swing arm fixing fixture and fixing device. The fixing fixture includes a mounting plate and a first clamping mechanism, a second clamping mechanism and a third clamping mechanism arranged on the mounting plate. The first clamping mechanism, the second clamping mechanism and the third clamping mechanism are respectively used to fix the first end, the second end and the third end of the lower swing arm to perform three-point positioning of the lower swing arm. The first clamping mechanism, the second clamping mechanism and the third clamping mechanism each include a support member for supporting the end of the lower swing arm and at least one movable clamping member for clamping or pressing the end of the lower swing arm. The base and the movable clamping member cooperate to fix one end of the lower swing arm. The lower swing arm fixing fixture of the patent replaces manual pressing, which improves work efficiency and saves labor costs.

[0005] However, the current vehicle lower control arm fixing fixture and fixing device have the following problems: when the vehicle lower control arm fixing fixture and fixing device are in use, due to the presence of a gap in the butting portion of the workpieces, the welding quality is poor, causing the vehicle lower control arm to break easily, resulting in a large gap in the welding fixing device when fixing the vehicle lower control arm, resulting in the problem of poor welding quality. Therefore, a positioning welding fixing device is proposed. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a positioning welding fixture to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a positioning welding fixing device, including a bottom table, half arc frames are fixed on both sides of the top surface of the bottom table, vertical columns are fixed on the top surface of the bottom table, an L-shaped bottom plate is fixed on the top surface of the vertical columns, a horizontal plate is fixed on the top of the outer wall of the vertical column, magnetic blocks are fixed on the left and right sides of the horizontal plate, two circular holes are provided on the front side of the horizontal plate, sliding grooves are provided on both sides of the front side of the horizontal plate, fork rods are slidably installed on the inner walls of the two circular holes of the horizontal plate, an electric telescopic rod is fixedly installed on the back side of the fork rod, and the electric The telescopic rod is located in the middle of the top surface of the bottom table, a U-shaped plate is fixed on the front of the fork rod, cylinders are penetrated and fixedly installed on the left and right sides of the U-shaped plate, a round head is slidably installed on the inner wall of the cylinder, a spring 1 is arranged between the round head and the cylinder, an inner angle support device is arranged on the back of the U-shaped plate, and an alignment device is arranged on the bottom surface of the L-shaped bottom plate. Under the action of the extrusion force, the round head slides in the cylinder, and the spring on the round head begins to shrink. Under the elastic force of spring 1, the round head presses against the swing arm workpiece and moves toward the middle, so that the gap between the swing arm workpiece and the T-shaped workpiece is reduced.

[0008] According to the above technical solution, four supporting feet are arranged on the four sides of the bottom surface of the bottom table, the vertical column is arranged in the middle of the semi-arc frame, a circular hole is opened on the front of the L-shaped bottom plate, two protrusions are arranged on the bottom surface of the L-shaped bottom plate, and the magnetic block is arranged on the back of the workpiece.

[0009] According to the above technical scheme, a square plate is slidably installed on the inner wall of the slide groove of the horizontal plate, a vertical block is fixed on the back of the square plate, and two arc-shaped spring sheets are fixed on the opposite surfaces of the vertical blocks. The end of the arc-shaped spring sheet away from the vertical block is fixed on the back of the horizontal plate. The square plate is arranged below the inner wall of the workpiece, and the swing arm workpiece will resist the square plate in the slide groove of the horizontal plate. The square plate drives the vertical block to move toward the middle, and under the elastic force of the arc-shaped spring sheet, the square plate resists the swing arm workpiece.

[0010] According to the above technical solution, the inner angle bracing device includes an L-shaped plate, the L-shaped plate is fixed on both sides of the back side of the U-shaped plate, a slide plate is slidably installed on the top surface of the inner wall of the L-shaped plate, and two arc-shaped spring sheets are fixed on the bottom surface of the slide plate, and one end of the arc-shaped spring sheet two away from the slide plate is fixed on the inner wall of the L-shaped plate, and a rubber roller is rotatably installed on the top of the inner wall of the slide plate, and the rubber roller contacts the bending part of the lower arm workpiece. Under the action of friction, the rubber roller rolls on the bending part of the lower arm workpiece, and under the action of extrusion force, the slide plate slides downward on the L-shaped plate, and the rubber roller is tightly pressed against the lower part of the bending part of the lower arm workpiece, so that the bending part of the workpiece of the automobile lower swing arm has a certain support force when welding.

[0011] According to the above technical solution, the two L-shaped plates are arranged in an inverted eight-shape, a protrusion is arranged on the top of the inner wall of the L-shaped plate, a sliding groove is opened on the top surface of the skateboard, the protrusion of the L-shaped plate is slidably arranged in the sliding groove of the skateboard, and the rubber roller is arranged at the bending part of the workpiece.

[0012] According to the above technical solution, the inner angle support device also includes a U-shaped square rod, the U-shaped square rod is fixed on the top surface of the skateboard, a slide groove is opened on the top surface of the U-shaped square rod, a T-shaped block is slidably installed on the inner wall of the slide groove of the U-shaped square rod, a rubber pad is fixed on the bottom surface of the T-shaped block, and the T-shaped block moves upward in the slide groove of the U-shaped square rod so that the rubber pad is against the bending part of the workpiece, so that the workpiece is not easy to warp upward when supporting the bending part.

[0013] According to the above technical solution, the alignment device includes an L-shaped fork groove plate, which is slidably installed on the bottom surface of the L-shaped base plate, and the bottom surface of the L-shaped fork groove plate is provided with two slide grooves, and the protrusion of the L-shaped base plate is slidably arranged in the two slide groove inner walls of the L-shaped fork groove plate, and a connecting rod is arranged in the middle of the front of the L-shaped fork groove plate, and the connecting rod of the L-shaped fork groove plate is fixed in the middle of the front of the U-shaped plate, and a circular hole is opened in the middle of the front of the L-shaped fork groove plate, and a T-shaped sliding rod is slidably installed on the inner wall of the circular hole of the L-shaped fork groove plate, and the L-shaped A second spring is arranged between the fork groove plate and the T-shaped slide bar, the T-shaped slide bar and the inner wall of the circular hole of the L-shaped bottom plate are slidably installed, a second spring is arranged between the L-shaped bottom plate and the T-shaped slide bar, a square block is fixed on the opposite surface of the T-shaped slide bar, a semi-arc rubber block is fixed on the opposite surface of the square block, the semi-arc rubber block clamps the T-shaped workpiece, and in the process of the semi-arc rubber block clamping the T-shaped workpiece, the two T-shaped slide bars move forward and backward respectively, and under the elastic force of the second spring, the semi-arc rubber block clamps the T-shaped workpiece in the middle of the L-shaped bottom plate.

[0014] According to the above technical scheme, the alignment device also includes a U-shaped groove plate, which is fixed to the front side of the L-shaped fork groove plate, and sliding grooves are opened on both sides of the front side of the U-shaped groove plate. The inner wall of the sliding groove of the U-shaped groove plate is slidably installed with a sliding column, the back side of the sliding column is set to a spherical arc surface, the outer wall of the sliding column is fixed with a circular ring, and the top surface of the circular ring is fixed with an arc-shaped spring piece three, and the end of the arc-shaped spring piece three away from the circular ring is fixed to the top of the back side of the U-shaped groove plate, the sliding column moves upward in the sliding groove of the U-shaped groove plate, the sliding column drives the circular ring to move upward, and the circular ring drives the arc-shaped spring piece three to move upward, and under the elastic force of the arc-shaped spring piece three, the sliding column is against the top of the T-shaped workpiece.

[0015] The present invention provides a positioning welding fixture. It has the following beneficial effects:

[0016] (1) The present invention cooperates with an arc-shaped spring sheet 1 through a horizontal plate, a magnetic block, a fork rod, an electric telescopic rod, a U-shaped plate, a cylinder, a round head, a square plate and a vertical block. The U-shaped plate drives the cylinder to move backward, and the cylinder drives the round head to move backward. The round head contacts the swing arm workpiece. Under the action of the extrusion force, the round head slides in the cylinder, and the spring on the round head begins to shrink. Under the elastic force of the spring 1, the round head presses against the swing arm workpiece and moves toward the middle, so that the gap between the swing arm workpiece and the T-shaped workpiece is reduced, thereby preventing the welding fixture from having a large gap when fixing the lower swing arm of the automobile, resulting in poor welding quality. In addition, the swing arm workpiece presses against the square plate in the horizontal plate slide groove, and the square plate drives the vertical block to move toward the middle. The arc-shaped spring sheet 1 on the vertical block is deformed. Under the elastic force of the arc-shaped spring sheet 1, the square plate presses against the swing arm workpiece, thereby preventing the welding fixture from being offset in the process of reducing the gap, resulting in poor welding effect.

[0017] (2) The present invention arranges the inner angle brace device so that the L-shaped plate, the slide plate, the second arc-shaped spring sheet, the rubber roller, the U-shaped square rod and the T-shaped block cooperate with the rubber pad. The rubber roller contacts the bending part of the lower arm workpiece. Under the action of friction, the rubber roller rolls at the bending part of the lower arm workpiece. Under the action of extrusion force, the slide plate slides downward on the L-shaped plate. Under the elastic force of the second arc-shaped spring sheet, the rubber roller is tightly pressed against the lower part of the bending part of the lower arm workpiece, so that the bending part of the automobile lower swing arm has a certain supporting force during welding, thereby preventing the welding fixture from shaking during welding due to uneven force on the bending part of the automobile lower swing arm when clamping. Moreover, the rubber pad contacts the bending part of the workpiece. Under the action of extrusion force, the T-shaped block moves upward in the slide groove of the U-shaped square rod, thereby making the rubber pad pressed against the bending part of the workpiece, thereby preventing the workpiece from tilting upward when supporting the bending part, thereby preventing the welding fixture from tilting upward when clamping the bending part of the automobile lower swing arm, thereby causing poor fixing effect.

[0018] (3) The present invention arranges the alignment device so that the L-shaped fork groove plate, T-shaped slide bar, square block, semi-arc rubber block, U-shaped groove plate, slide column and circular ring cooperate with the arc spring sheet three, and the semi-arc rubber block clamps the T-shaped workpiece. In the process of the semi-arc rubber block clamping the T-shaped workpiece, the two T-shaped slide bars move forward and backward respectively, and the spring two on the T-shaped slide bar begins to shrink. Under the elastic force of the spring two, the semi-arc rubber block clamps the T-shaped workpiece in the middle of the L-shaped bottom plate, preventing the welding fixture from being misaligned when the lower arm of the automobile is clamped, resulting in poor equipment fixing effect. In addition, the slide column moves upward in the slide groove of the U-shaped groove plate, and the slide column drives the circular ring to move upward, and the circular ring drives the arc spring sheet three to move upward. Under the elastic force of the arc spring sheet three, the slide column is pressed against the top of the T-shaped workpiece, preventing the welding fixture from being displaced when the lower arm of the automobile is clamped, resulting in inaccurate fixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the present invention as a whole;

[0020] Figure 2 It is a schematic diagram of the back cross-section of the present invention as a whole;

[0021] Figure 3 It is a cross-sectional schematic diagram of the horizontal plate of the present invention;

[0022] Figure 4 It is a partial enlarged schematic diagram of the horizontal plate A of the present invention;

[0023] Figure 5 is a schematic cross-sectional view of the inner angle bracing device of the present invention;

[0024] Figure 6 It is a partial enlarged schematic diagram of the inner angle bracing device B of the present invention;

[0025] Figure 7 is a schematic cross-sectional view of an alignment device of the present invention;

[0026] Figure 8 It is a partial enlarged schematic diagram of the alignment device C of the present invention.

[0027] In the figure: 1. bottom table; 2. semi-arc frame; 3. vertical column; 4. L-shaped bottom plate; 5. horizontal plate; 6. inner angle bracing device; 61. L-shaped plate; 62. slide plate; 63. arc spring piece 2; 64. rubber roller; 65. U-shaped square rod; 66. T-shaped block; 67. rubber pad; 7. alignment device; 71. L-shaped fork groove plate; 72. T-shaped slide bar; 73. square block; 74. semi-arc rubber block; 75. U-shaped groove plate; 76. slide column; 77. ring; 78. arc spring piece 3; 8. magnetic block; 9. fork rod; 10. electric telescopic rod; 11. U-shaped plate; 12. cylinder; 13. round head; 14. square plate; 15. vertical block; 16. arc spring piece 1. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] See also Figure 1-Figure 8, one embodiment of the present invention is: a positioning welding fixing device, including a bottom table 1, half arc frames 2 are fixed on both sides of the top surface of the bottom table 1, a vertical column 3 is fixed on the top surface of the bottom table 1, an L-shaped bottom plate 4 is fixed on the top surface of the vertical column 3, a horizontal plate 5 is fixed on the top of the outer wall of the vertical column 3, and magnetic blocks 8 are fixed on the left and right sides of the horizontal plate 5. Two circular holes are opened on the front of the horizontal plate 5, and sliding grooves are opened on both sides of the front of the horizontal plate 5. Fork rods 9 are slidably installed on the inner walls of the two circular holes of the horizontal plate 5, and an electric telescopic rod 10 is fixedly installed on the back of the fork rod 9. The electric telescopic rod 10 is located in the middle of the top surface of the bottom table 1, and a U-shaped plate 1 is fixed on the front of the fork rod 9. 1. The left and right sides of the U-shaped plate 11 are penetrated and fixedly installed with a cylinder 12, the inner wall of the cylinder 12 is slidably installed with a round head 13, and a spring 1 is arranged between the round head 13 and the cylinder 12. Four supporting feet are arranged on the four sides of the bottom surface of the bottom table 1, the vertical column 3 is arranged in the middle of the semi-arc frame 2, a round hole is opened on the front of the L-shaped bottom plate 4, and two protrusions are arranged on the bottom surface of the L-shaped bottom plate 4. The magnetic block 8 is arranged on the back of the workpiece, and the round head 13 presses against the swing arm workpiece to move toward the middle, so that the gap between the swing arm workpiece and the T-shaped workpiece is reduced, so as to avoid the welding fixture having a large gap when fixing the lower swing arm of the automobile, resulting in poor welding quality.

[0030] A square plate 14 is slidably installed on the inner wall of the slide groove of the horizontal plate 5, and a vertical block 15 is fixed on the back of the square plate 14. Two arc-shaped spring pieces 16 are fixed on the opposite surfaces of the vertical blocks 15. One end of the arc-shaped spring piece 16 away from the vertical block 15 is fixed on the back of the horizontal plate 5. The square plate 14 is arranged below the inner wall of the workpiece. Under the elastic force of the arc-shaped spring piece 16, the square plate 14 presses against the swing arm workpiece to avoid the welding fixture from being offset in the process of reducing the gap, resulting in poor welding effect.

[0031] When in use, the bottom table 1 supports the semi-arc frame 2, the bottom table 1 supports the vertical column 3, the vertical column 3 supports the L-shaped bottom plate 4, and the vertical column 3 supports the horizontal plate 5. The staff places the automobile lower swing arm workpiece into the semi-arc frame 2, and the magnetic block 8 on the horizontal plate 5 adsorbs the swing arm workpiece to position the automobile lower swing arm workpiece. The staff then places the T-shaped workpiece onto the L-shaped bottom plate 4, and uses an electric wire to start the electric telescopic rod 10 on the bottom table 1. The telescopic end of the electric telescopic rod 10 begins to move backward, and the telescopic end of the electric telescopic rod 10 drives the fork rod 9 to move backward. The fork rod 9 moves backward in the round hole of the horizontal plate 5, and the fork rod 9 drives the U-shaped plate 11 to move backward. The U-shaped plate 11 clamps the swing arm workpiece during the backward movement, so that the workpiece of the automobile lower swing arm is fixed, which is convenient for the next step of welding. However, during the welding process, due to the presence of a gap in the joint part of the workpiece, poor welding quality may easily cause the lower swing arm of the automobile to break. While the fork rod 9 drives the U-shaped plate 11 to move backward, the U-shaped plate 11 drives the cylinder 12 to move backward, and the cylinder 12 drives the round head 13 to move backward. The round head 13 contacts the swing arm workpiece, and under the action of the extrusion force, the round head 13 slides in the cylinder 12, and the spring on the round head 13 begins to shrink. Under the elastic force of the spring, the round head 13 presses against the swing arm workpiece and moves toward the middle, so that the gap between the swing arm workpiece and the T-shaped workpiece is reduced, thereby preventing a large gap between the workpieces when fixing the lower swing arm of the automobile, thereby avoiding the problem of poor welding quality caused by a large gap when the welding fixture is fixed to the lower swing arm of the automobile.

[0032] When the round head 13 presses against the swing arm workpiece and moves toward the middle, the swing arm workpiece will press against the square plate 14 in the slide groove of the horizontal plate 5, and the square plate 14 starts to move toward the middle, and the square plate 14 drives the vertical block 15 to move toward the middle, and the arc spring piece 16 on the vertical block 15 is deformed. Under the elastic force of the arc spring piece 16, the square plate 14 presses against the swing arm workpiece to prevent the swing arm workpiece from shifting in the process of moving toward the middle, thereby avoiding the problem of poor welding effect caused by the deviation of the welding fixture in the process of reducing the gap.

[0033] See also Figure 1-Figure 8On the basis of the above embodiment, another embodiment of the present invention further includes an inner angle bracing device 6 and an alignment device 7, wherein the inner angle bracing device 6 is provided on the back of the U-shaped plate 11, and the inner angle bracing device 6 includes an L-shaped plate 61, and the L-shaped plate 61 is fixed on both sides of the back of the U-shaped plate 11, and a slide plate 62 is slidably installed on the top surface of the inner wall of the L-shaped plate 61, and an arc-shaped spring sheet 63 is fixed on the bottom surface of the slide plate 62, and the end of the arc-shaped spring sheet 63 away from the slide plate 62 is fixed on the inner wall of the L-shaped plate 61, and the top of the inner wall of the slide plate 62 is rotated. A rubber roller 64 is installed, and two L-shaped plates 61 are arranged in an inverted eight-shaped shape. A protrusion is arranged on the top of the inner wall of the L-shaped plate 61, and a slide groove is opened on the top surface of the slide plate 62. The protrusion of the L-shaped plate 61 is slidably arranged in the slide groove of the slide plate 62. The rubber roller 64 is arranged at the bending part of the workpiece, and the rubber roller 64 is tightly pressed against the bottom of the bending part of the lower arm workpiece, so that the bending part of the workpiece of the automobile lower swing arm has a certain supporting force during welding, so as to avoid the uneven force at the bending part of the automobile lower swing arm when the welding fixture is clamped, causing shaking during welding.

[0034] The inner angle support device 6 also includes a U-shaped square rod 65, which is fixed on the top surface of the slide plate 62. A slide groove is opened on the top surface of the U-shaped square rod 65. A T-shaped block 66 is slidably installed on the inner wall of the slide groove of the U-shaped square rod 65. A rubber pad 67 is fixed on the bottom surface of the T-shaped block 66. The rubber pad 67 is against the bending part of the workpiece, so that the workpiece is not easy to tilt upward when supporting the bending part, so as to avoid the bending part of the lower arm of the automobile tilting upward when the welding fixing device is clamped, resulting in poor fixing effect.

[0035] The bottom surface of the L-shaped bottom plate 4 is provided with an alignment device 7, and the alignment device 7 includes an L-shaped fork groove plate 71, which is slidably mounted on the bottom surface of the L-shaped bottom plate 4, and two slide grooves are provided on the bottom surface of the L-shaped fork groove plate 71. The protrusion of the L-shaped bottom plate 4 is slidably arranged in the two slide groove inner walls of the L-shaped fork groove plate 71, and a connecting rod is provided in the middle of the front of the L-shaped fork groove plate 71. The connecting rod of the L-shaped fork groove plate 71 is fixed in the middle of the front of the U-shaped plate 11, and a round hole is provided in the middle of the front of the L-shaped fork groove plate 71. The inner wall of the round hole of the L-shaped fork groove plate 71 is slidably mounted. There is a T-shaped slide bar 72, two springs are arranged between the L-shaped fork groove plate 71 and the T-shaped slide bar 72, the T-shaped slide bar 72 and the inner wall of the circular hole of the L-shaped bottom plate 4 are slidably installed, two springs are arranged between the L-shaped bottom plate 4 and the T-shaped slide bar 72, a square block 73 is fixed on the opposite surface of the T-shaped slide bar 72, and a semi-arc rubber block 74 is fixed on the opposite surface of the square block 73. The semi-arc rubber block 74 clamps the T-shaped workpiece in the middle of the L-shaped bottom plate 4 to avoid the misalignment of the lower swing arm of the automobile when the welding fixing device is clamped, resulting in poor equipment fixing effect.

[0036] The alignment device 7 also includes a U-shaped groove plate 75, which is fixed to the front side of the L-shaped fork groove plate 71. Slide grooves are opened on both sides of the front side of the U-shaped groove plate 75. A slide column 76 is slidably installed on the inner wall of the slide groove of the U-shaped groove plate 75. The back side of the slide column 76 is set to a spherical arc surface. A circular ring 77 is fixed to the outer wall of the slide column 76. An arc-shaped spring piece three 78 is fixed to the top surface of the circular ring 77. The end of the arc-shaped spring piece three 78 away from the circular ring 77 is fixed to the top of the back side of the U-shaped groove plate 75. Under the elastic force of the arc-shaped spring piece three 78, the slide column 76 is against the top of the T-shaped workpiece to avoid the displacement of the lower swing arm of the automobile when the welding fixture is clamped, resulting in inaccurate fixation.

[0037] When the fork rod 9 drives the U-shaped plate 11 to move backward, the U-shaped plate 11 drives the L-shaped plate 61 to move backward, the L-shaped plate 61 drives the slide plate 62 to move backward, and the slide plate 62 drives the rubber roller 64 to move backward. The rubber roller 64 contacts the bending part of the lower arm workpiece. Under the action of friction, the rubber roller 64 rolls at the bending part of the lower arm workpiece. At the same time, under the action of the extrusion force, the slide plate 62 slides downward on the L-shaped plate 61, and the arc-shaped spring sheet 2 63 on the slide plate 62 begins to deform. Under the elastic force of the arc-shaped spring sheet 2 63, the rubber roller 64 is tightly pressed against the bottom of the bending part of the lower arm workpiece, so that the bending part of the workpiece of the automobile lower swing arm has a certain supporting force during welding, thereby preventing the automobile lower swing arm workpiece from being unevenly stressed at the bending part during welding, thereby avoiding the problem of shaking during welding caused by uneven stress at the bending part of the automobile lower swing arm when the welding fixture is clamped.

[0038] When the L-shaped plate 61 drives the slide plate 62 to move backward, the slide plate 62 drives the U-shaped square rod 65 to move backward, the U-shaped square rod 65 drives the T-shaped block 66 to move backward, and the T-shaped block 66 drives the rubber pad 67 to move backward. When the slide plate 62 slides downward on the L-shaped plate 61, the slide plate 62 drives the U-shaped square rod 65 to move downward, the U-shaped square rod 65 drives the T-shaped block 66 to move downward, and the T-shaped block 66 drives the rubber pad 67 to move downward. The rubber pad 67 contacts the bending part of the workpiece. Under the action of the extrusion force, the T-shaped block 66 moves upward in the slide groove of the U-shaped square rod 65, so that the rubber pad 67 is against the bending part of the workpiece, so that the workpiece is not easy to tilt upward when supporting the bending part, preventing the equipment from causing the workpiece to tilt upward when clamping, thereby avoiding the problem of poor fixing effect caused by the bending part of the automobile lower swing arm tilting upward when the welding fixture is clamped.

[0039] When the fork rod 9 drives the U-shaped plate 11 to move backward, the U-shaped plate 11 drives the connecting rod on the L-shaped fork groove plate 71 to move, and the L-shaped fork groove plate 71 moves backward under the L-shaped bottom plate 4. The L-shaped fork groove plate 71 drives the T-shaped slide bar 72 to move backward, and the T-shaped slide bar 72 drives the square block 73 to move backward. The square block 73 drives the semi-arc rubber block 74 to move backward. The semi-arc rubber block 74 contacts the T-shaped workpiece. At the same time, the L-shaped bottom plate 4 supports another T-shaped slide bar 72, and another T-shaped slide bar 72 supports another square block 73. A square block 73 supports a semi-arc rubber block 74 so that the semi-arc rubber block 74 clamps the T-shaped workpiece. In the process of the semi-arc rubber block 74 clamping the T-shaped workpiece, the two T-shaped slide bars 72 move forward and backward respectively, and the spring 2 on the T-shaped slide bar 72 begins to shrink. Under the elastic force of the spring 2, the semi-arc rubber block 74 clamps the T-shaped workpiece in the middle of the L-shaped bottom plate 4 to prevent the T-shaped workpiece from shifting when being fixed, thereby avoiding the problem of poor equipment fixing effect caused by the misalignment of the lower arm of the automobile when the welding fixing device is clamped.

[0040] When the L-shaped fork groove plate 71 moves backward under the L-shaped bottom plate 4, the L-shaped fork groove plate 71 drives the U-shaped groove plate 75 to move backward, and the U-shaped groove plate 75 drives the sliding column 76 to move backward. The sliding column 76 contacts the T-shaped workpiece. Under the action of the extrusion force, the sliding column 76 moves upward in the sliding groove of the U-shaped groove plate 75, and the sliding column 76 drives the circular ring 77 to move upward. The circular ring 77 drives the arc spring piece three 78 to move upward. The arc spring piece three 78 is deformed. Under the elastic force of the arc spring piece three 78, the sliding column 76 is against the top of the T-shaped workpiece to prevent the equipment from causing displacement of the workpiece when clamping the workpiece, thereby avoiding the problem of inaccurate fixation caused by displacement of the lower swing arm of the automobile when the welding fixture is clamped.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A positioning welding fixture, comprising a base table (1), half arc frames (2) are fixed on both sides of the top surface of the base table (1), a vertical column (3) is fixed on the top surface of the base table (1), and an L-shaped bottom plate (4) is fixed on the top surface of the vertical column (3), characterized in that: A horizontal plate (5) is fixed on the top of the outer wall of the vertical column (3), and magnetic blocks (8) are fixed on the left and right sides of the horizontal plate (5). Two circular holes are provided on the front of the horizontal plate (5), and sliding grooves are provided on both sides of the front of the horizontal plate (5). A fork rod (9) is slidably installed on the inner wall of the two circular holes of the horizontal plate (5), and an electric telescopic rod (10) is fixedly installed on the back of the fork rod (9). The electric telescopic rod (10) is located in the middle of the top surface of the bottom table (1). A U-shaped plate (11) is fixed on the front of the fork rod (9), and a cylinder (12) is penetrated and fixedly installed on the left and right sides of the U-shaped plate (11). A round head (13) is slidably installed on the inner wall of the cylinder (12), and a spring is provided between the round head (13) and the cylinder (12). An inner angle support device (6) is provided on the back of the U-shaped plate (11), and an alignment device (7) is provided on the bottom surface of the L-shaped bottom plate (4); The bottom surface of the bottom table (1) is provided with four supporting legs on four sides, the vertical column (3) is arranged in the middle of the semi-arc frame (2), a circular hole is opened on the front of the L-shaped bottom plate (4), two protrusions are arranged on the bottom surface of the L-shaped bottom plate (4), and the magnetic block (8) is arranged on the back of the workpiece; A square plate (14) is slidably mounted on the inner wall of the slide groove of the horizontal plate (5), a vertical block (15) is fixed on the back of the square plate (14), two arc-shaped spring pieces (16) are fixed on opposite surfaces of the vertical block (15), one end of the arc-shaped spring piece (16) away from the vertical block (15) is fixed on the back of the horizontal plate (5), and the square plate (14) is arranged below the inner wall of the workpiece; The alignment device (7) comprises an L-shaped fork groove plate (71), the L-shaped fork groove plate (71) being slidably mounted on the bottom surface of the L-shaped base plate (4), the bottom surface of the L-shaped fork groove plate (71) being provided with two slide grooves, the protrusions of the L-shaped base plate (4) being slidably mounted in the inner walls of the two slide grooves of the L-shaped fork groove plate (71), a connecting rod being arranged in the middle of the front surface of the L-shaped fork groove plate (71), the connecting rod of the L-shaped fork groove plate (71) being fixed in the middle of the front surface of the U-shaped plate (11), and the front surface of the L-shaped fork groove plate (71) being provided with a connecting rod. A circular hole is provided, a T-shaped slide bar (72) is slidably mounted on the inner wall of the circular hole of the L-shaped fork groove plate (71), two springs are arranged between the L-shaped fork groove plate (71) and the T-shaped slide bar (72), the T-shaped slide bar (72) and the inner wall of the circular hole of the L-shaped bottom plate (4) are slidably mounted, two springs are arranged between the L-shaped bottom plate (4) and the T-shaped slide bar (72), a square block (73) is fixed to the opposite surface of the T-shaped slide bar (72), and a semi-arc rubber block (74) is fixed to the opposite surface of the square block (73).

2. A positioning welding fixture according to claim 1, characterized in that: The alignment device (7) further comprises a U-shaped groove plate (75), wherein the U-shaped groove plate (75) is fixed on the front side of the L-shaped fork groove plate (71), and sliding grooves are provided on both sides of the front side of the U-shaped groove plate (75), and a sliding column (76) is slidably mounted on the inner wall of the sliding groove of the U-shaped groove plate (75), and the back side of the sliding column (76) is arranged as a spherical arc surface, and a circular ring (77) is fixed on the outer wall of the sliding column (76), and an arc-shaped spring sheet three (78) is fixed on the top surface of the circular ring (77), and the end of the arc-shaped spring sheet three (78) away from the circular ring (77) is fixed to the top of the back side of the U-shaped groove plate (75).

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