A welding fixture for a seat plate of a tow hitch

Abstract

The application provides a welding tool for traction seat plate, belonging to the technical field of machinery. It solves the problem of low efficiency and difficulty in ensuring positioning accuracy before welding in batch production. It comprises a platform, a supporting seat fixed on the platform, a connecting block and a clamping arm. The connecting block is long and horizontally arranged. The rear end of the connecting block is hinged to the top of the supporting seat and can swing the front end upward around the hinge point. The clamping arm is vertically arranged and the middle part of the clamping arm is hinged to the middle part of the connecting block. The front end bottom of the connecting block is fixedly connected with a clamping block. A matching groove is arranged between the rear side and the bottom of the clamping block and penetrates through the clamping block along the width direction of the connecting block. An elastic member is arranged between the clamping arm and the connecting block. The elastic force of the elastic member acts on the clamping arm. The lower end of the clamping arm is located in the matching groove. The clamping arm swings in the direction of overcoming the elastic force of the elastic member to make the lower end of the clamping arm away from the matching groove. It has the advantages of high production efficiency, high positioning accuracy before welding and the like.

Description

Technical Field

[0001] This invention belongs to the field of mechanical technology and relates to a welding fixture for a traction seat plate. Background Technology

[0002] Semi-trailer trucks are increasingly widely used due to their large load capacity and high load-bearing capacity. A semi-trailer truck consists of a tractor unit and a semi-trailer. The tractor unit is equipped with a tow seat, while the semi-trailer is equipped with a tow pin. The tow pin connects the tractor unit and the semi-trailer by interfacing with the tow seat. The tow seat consists of a tow seat plate and a support, such as... Figure 8 As shown, the traction seat plate includes a housing 20 with a V-shaped mounting opening and a frame 21 welded and fixed within the housing 20. The frame 21 is generally rectangular, and each end of the frame 21 has a pivot bracket 21a. Both pivot brackets 21a have hinge holes for hinged connection with the support. In addition, a handle and a release-connection mechanism are also provided inside the housing 20. Figure 8 (Not shown in the image), the handle is movable, and a safety lock is provided on the side of the housing 20. Figure 8 (Not shown in the image) The safety lock locks the handle. After the safety lock is opened, pulling the handle diagonally can control the separation-connection mechanism.

[0003] To ensure the handle can be securely locked, such as Figure 8 As shown, a safety lock block 22 is welded and fixed inside the housing 20. The safety lock block 22 has a locking groove 22a, and a locking part is provided on the handle side. When the handle is locked by the safety lock, the locking part is located in the locking groove 22a of the safety lock block 22, forming a double lock. Currently, for the welding of the safety lock block 22 to the housing 20, existing workers measure and mark the welding position on the housing 20 according to the dimensions in the design drawings, and then the workers abut the safety lock block 22 against the marked position on the housing 20 and weld it. However, the housing 20 is not a complete flat plate; it has uneven areas. This causes a relatively large error when measuring the position with a ruler, resulting in inaccurate positioning of the safety lock block 22 and inability to weld it accurately to the designated position. In addition, in mass production, if each one is measured and marked, it will take a lot of time and seriously affect production efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a welding fixture for traction seat plates, which solves the problems of low efficiency and difficulty in ensuring positioning accuracy before welding in mass production.

[0005] The objective of this invention can be achieved through the following technical solutions: A welding fixture for a traction seat plate includes a platform and a support fixed on the platform. The welding fixture further includes a connecting block and a clamping arm. The connecting block is elongated and horizontally positioned. The rear end of the connecting block is hinged to the top of the support. The connecting block can swing its front end upwards around the hinge point. The clamping arm is vertically positioned, with its middle portion hinged to the middle of the connecting block. A clamping block is fixedly connected to the bottom front end of the connecting block. A mating groove is provided between the rear side and bottom of the clamping block, extending through the clamping block along its width. An elastic element is provided between the clamping arm and the connecting block. The elastic force of the elastic element acts on the clamping arm, and the lower end of the clamping arm is located within the mating groove. Swinging the clamping arm in a direction that overcomes the elastic force of the elastic element allows the lower end of the clamping arm to move away from the mating groove.

[0006] In use, first fix the housing on the platform. Swing the connecting block upwards around the hinge point, then move the clamping arm in a direction that overcomes the elastic force of the elastic element, moving its lower end away from the mating groove. Next, place the safety lock block between the clamping block and the lower end of the clamping arm. The safety lock block is secured in the mating groove via a locking groove, with its upper side abutting against the upper wall of the mating groove, thus limiting its height. Then, release the clamping arm. The elastic force of the elastic element acts on the clamping arm, causing its lower end to move towards the clamping block and clamp the safety lock block securely, preventing it from falling off. Finally, swing the connecting block back around the hinge point to a horizontal position. At this point, the safety lock block is precisely against the designated position on the inner top wall of the housing. Then, spot weld the safety lock block. After spot welding, swing the connecting block upwards again around the hinge point. At this point, although the safety lock block and the housing have been fixed together by spot welding, the clamping arm is hinged to the connecting block, and the clamping force that clamps the safety lock block is formed by the elastic element acting on the clamping arm. Therefore, when the outer end of the connecting block is swung upward, the safety lock block, which is already fixed to the housing, will exert a squeezing force on the clamping arm. This will cause the clamping arm to swing and move its lower end away from the clamping block. In this way, the clamping gap between the clamping block and the lower end of the clamping arm will be automatically widened, allowing the safety lock block to automatically separate from the clamping structure.

[0007] This welding fixture allows for precise and secure positioning of the safety lock block at a designated location on the inner bottom wall of the housing before spot welding. In particular, the mating groove limits the high-speed movement of the safety lock block, ensuring that it rests against the inner bottom wall of the housing when the connecting block is horizontal. This ensures that each safety lock block is accurately spot-welded to its designated position on the inner bottom wall of the housing during mass production, thus improving the positioning accuracy before spot welding. Furthermore, this welding fixture eliminates the need for marking positions on the inner bottom wall of the housing during mass production, saving significant time and greatly improving production efficiency. Especially noteworthy is that after spot welding, when flipping the connecting block, the safety lock block automatically reverses its position by pressing against the clamping arm, releasing the safety lock block. This means there is no interference between the clamping arm and the welded safety lock block during the flipping process, eliminating the need for manual disengagement of the clamping arm, making the operation extremely convenient.

[0008] In the welding fixture for the traction seat plate described above, the front side of the clamping arm includes a straight surface and an outwardly convex arc-shaped clamping surface, the arc-shaped clamping surface being located at the lower end of the clamping arm and protruding beyond the straight surface.

[0009] In practice, the safety lock block is a cast part, and its surface precision is not high, so it cannot be guaranteed to be completely flat (of course, the low surface precision will not affect the actual use of the safety lock block). If the front side of the clamping arm is set to be a completely straight surface, the low surface precision of the safety lock block will cause the lower end of the clamping arm to press too high or too low, resulting in the safety lock block tilting.

[0010] Therefore, the front side of the clamping arm is designed to include a straight surface and an outwardly convex arc-shaped clamping surface. The arc-shaped clamping surface is located at the lower end of the clamping arm and protrudes beyond the straight surface. The arc-shaped clamping surface presses against the safety lock block, clamping and fixing it between the clamping block and the lower end of the clamping arm. Because it is an arc-shaped clamping surface, it can ensure that the pressing position on each safety lock block is basically consistent during batch processing, and will not be too high or too low. In this way, the safety lock block is less likely to tilt after being clamped and fixed, thereby improving production efficiency while ensuring spot welding accuracy.

[0011] In the above-mentioned welding fixture for traction seat plate, the clamping arm includes two arm bodies, which are arranged opposite to each other along the width direction of the connecting block and located on both sides of the connecting block. The two arm bodies are hinged to the connecting block through the same hinge shaft. The upper ends of the two arm bodies are fixedly connected through a connecting shaft. The elastic element is a tension spring, the front end of which is connected to the connecting shaft, and the rear end of which acts on the connecting block.

[0012] The front end of the tension spring is connected to the connecting shaft, and the rear end of the tension spring acts on the connecting block. The tension of the spring pulls the upper end of the clamping arm backward, ensuring that the lower end of the clamping arm always moves towards the clamping block, thus creating a clamping force that firmly clamps and fixes the safety lock block. In particular, the front end of the tension spring is connected to the connecting shaft, which is fixedly connected between the upper ends of the two arms. This results in a more even clamping force, preventing one-sided clamping.

[0013] In the above-mentioned welding fixture for traction seat plate, an adjusting block is provided near the rear end of the connecting block. The adjusting block has a strip-shaped adjusting groove along the length of the connecting block. The adjusting block and the connecting block are fixed together by fastening screws. The shank of the fastening screw passes through the adjusting groove and is threaded into the connecting block. The rear end of the tension spring is connected to the adjusting block.

[0014] With the fastening screws loosened, the position of the adjusting block on the connecting block can be adjusted along its length. After adjustment, the fastening screws are tightened again to fix the adjusting block to the connecting block. Since one end of the tension spring is connected to the adjusting block, the spring force acting on the clamping arm changes as the position of the adjusting block on the connecting block changes. This ensures that a stable clamping force is maintained between the lower end of the clamping arm and the clamping block during long-term use.

[0015] In the above-mentioned welding fixture for traction seat plate, the upper end of the clamping block is U-shaped, the front end of the connecting block is located inside the upper end of the clamping block, and the side of the clamping block is provided with a strip-shaped adjustment groove II along the length direction of the connecting block. The clamping block and the connecting block are fixed together by an adjustment screw, and the rod of the adjustment screw passes through the adjustment groove II and is threaded into the front side of the connecting block.

[0016] With the adjusting screw loosened, the position of the clamping block on the connecting block can be finely adjusted along its length. After adjustment, the adjusting screw should be tightened again to fix the clamping block to the connecting block. The clamping arm, under the elastic force of the elastic element, cooperates with the clamping block to lock the safety lock block. In other words, by finely adjusting the position of the clamping block, the position of the safety lock block can be finely adjusted to further ensure that the safety lock block is accurately welded to the designated position on the housing.

[0017] In the above-mentioned welding fixture for traction seat plate, the welding fixture further includes a drive cylinder fixed on the platform. The drive cylinder is located on one side of the support seat. A swing seat is hinged to the top of the cylinder body of the drive cylinder. A clamping block is provided on the swing seat. The clamping block is strip-shaped. One end of the clamping block is hinged to the piston rod of the drive cylinder. The middle part of the clamping block is hinged to the swing seat. The upward movement of the piston rod of the drive cylinder can cause the clamping block to press on the connecting block.

[0018] Before spot welding begins, the piston rod of the drive cylinder moves upward. Since one end of the clamping block is hinged to the piston rod of the drive cylinder and the middle part of the clamping block is hinged to the swing seat, the other end of the clamping block will swing downward and press on the connecting block. This ensures that the connecting block remains stationary when spot welding the safety lock block, thereby avoiding the safety lock block from jumping and causing incomplete welding, and improving the welding accuracy.

[0019] In the above-mentioned welding fixture for traction seat plate, two clamping mechanisms are provided on the platform. The two clamping mechanisms are arranged opposite each other and both clamping mechanisms can apply downward pressure. Several positioning columns are provided on the platform between the two clamping mechanisms, and the support seat is located on one side of the line connecting the two clamping mechanisms.

[0020] In use, the housing is placed on the platform and positioned using the positioning pins inserted into the holes on the housing. Then, two clamping mechanisms apply downward pressure to press the housing firmly onto the platform. This setup ensures that the housing is securely positioned on the platform, guaranteeing the welding precision of the safety lock block onto the housing.

[0021] In the aforementioned welding fixture for a traction seat plate, the clamping mechanism includes a mounting base fixed to a platform, a clamping cylinder fixed to the bottom of the platform, a linkage rod passing through the platform, and a clamping arm hinged at one end to the top of the mounting base. The lower end of the linkage rod is fixedly connected to the piston rod of the clamping cylinder, and a stop pin passes through the upper side of the linkage rod. A top pressure block is fixedly connected to the other end of the clamping arm. The clamping arm can swing around the hinge point until the top pressure block faces downward. When the clamping arm is in the state where the top pressure block faces downward, the piston rod of the clamping cylinder moves downward so that the stop pin presses on the upper side of the clamping arm. The mounting bases in the two clamping mechanisms are arranged opposite to each other. Both mounting bases are provided with through holes, and these two through holes are arranged along the same center line. A limit pin passes through the through hole. The linkage rod is U-shaped, and the limit pin passes through the linkage rod. A limit screw is provided on the side of the mounting base. A long strip-shaped limit groove is provided on the side of the limit pin along its length direction. The end of the limit screw is located in the limit groove.

[0022] In practice, the frame and shell are also welded together. This welding fixture can also assist in the welding of the frame and shell. Specifically, the shell is placed on the platform and positioned using the positioning pins inserted into the holes on the shell. Then, the frame is placed inside the shell, and the two limit pins are pulled out from their respective through holes and inserted into the hinge holes of the two pivot pin brackets on the frame. The precise positioning of the frame within the shell is achieved by inserting the two limit pins into the hinge holes of the two pivot pin brackets. The clamping arm is then swung around the hinge point until the top pressure block faces downwards, abutting against the frame inside the shell. Next, the stop pin is inserted into the side of the linkage rod, and the piston rod of the clamping cylinder is controlled to move the linkage rod downwards, causing the stop pin to press against the upper side of the clamping arm, thus clamping the frame onto the shell and pressing the shell onto the platform. Welding of the frame can then begin. After the frame welding is completed, the clamping mechanism is kept stationary before spot welding the safety locking block onto the shell. After spot welding is completed, the piston rod of the control clamping cylinder drives the linkage rod to move upward. Then, the stop pin is removed from the linkage rod so that the stop pin will not obstruct the clamping arm. Finally, the clamping arm is flipped open around the hinge point to separate from the frame, and the limit pin is removed from the hinge hole of the pivot pin frame.

[0023] By inserting two limiting pins into the hinge holes of the two pivot brackets (the hinge holes are used to hinge with the supports in the traction seat), the frame can be kept straight along its length on the housing and positioned correctly on the housing, ensuring the welding accuracy of the frame on the housing. This welding fixture can assist in welding the frame to the housing and spot welding the safety lock block to the housing without the need for transfer, further improving production efficiency in mass production and having wider applicability. In addition, the above-mentioned clamping mechanism can correct the flatness of the housing after the frame and housing assembly is welded (the welding tension generated during the welding of the frame and housing causes the housing to deform and become uneven), ensuring that the flatness of the housing meets the requirements, thereby ensuring the welding accuracy of the safety lock block on the housing.

[0024] Compared with existing technologies, the welding fixture for the traction seat plate has the following advantages: 1. The safety lock block can be accurately and firmly positioned at a designated location on the bottom inner wall of the housing before spot welding. This ensures that each safety lock block can be accurately spot welded at a designated location on the bottom inner wall of each housing during mass production, thus improving the positioning accuracy of the safety lock block before spot welding. 2. In mass production, there is no need to mark the measurement position on the bottom wall inside the shell, saving a lot of time and greatly improving production efficiency in mass production. 3. It can assist in welding the frame onto the shell and spot welding the safety lock block onto the shell without the need for transfer, which further improves the production efficiency in mass production and has wider applicability. In this process, it can also eliminate the unevenness of the shell and ensure that the flatness of the shell meets the requirements after welding. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the welding fixture used for the traction seat plate in use.

[0026] Figure 2 This is another angled schematic diagram of the welding fixture used for the traction seat plate during use.

[0027] Figure 3 This is a sectional view of the welding fixture used for the traction seat plate in use.

[0028] Figure 4 This is a three-dimensional schematic diagram showing the clamping block and clamping arm clamping and fixing the safety lock block.

[0029] Figure 5 This is a three-dimensional schematic diagram of the clamping block and clamping arm before they clamp the safety lock block.

[0030] Figure 6 This is a three-dimensional schematic diagram of the clamping mechanism.

[0031] Figure 7 This is a schematic diagram showing the cooperation between the clamping mechanism and the pivot pin.

[0032] Figure 8 This is a three-dimensional schematic diagram of the traction seat plate.

[0033] In the diagram, 1. Platform; 2. Positioning pin; 3. Support base; 3a. Ear; 4. Connecting block; 4a. Connecting ear; 5. Clamping arm; 5a. Arc-shaped clamping surface; 5b. Arm body; 5c. Connecting shaft; 6. Clamping block; 6a. Mating groove; 7. Elastic element; 8. Hinge shaft; 9. Drive cylinder; 10. Swing seat; 11. Pressing block; 12. Mounting base; 13. Pressing cylinder; 14. Linkage rod; 15. Pressing arm; 16. Top pressure block; 17. Stop pin; 18. Limit pin; 18a. Limit groove; 19. Limit screw; 20. Housing; 21. Frame; 21a. Turning pin frame; 22. Safety lock block; 22a. Locking groove. Detailed Implementation

[0034] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0035] Example 1

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a welding fixture for a traction seat plate includes a platform 1 with two clamping mechanisms mounted on it. These mechanisms are positioned opposite each other and can apply downward clamping force. Several positioning posts 2 are also mounted on the platform 1 between the two clamping mechanisms. The welding fixture further includes a support base 3, a connecting block 4, and a clamping arm 5. The support base 3 is fixed to the platform 1 and located on one side of the line connecting the two clamping mechanisms. The connecting block 4 is elongated and horizontally positioned. Its rear end is hinged to the top of the support base 3, allowing it to swing upwards around the hinge point. The rear end of the connecting block 4 rests against the top surface of the support base 3. A pair of ears 3a protrude from the top of the support base 3. The connecting block 4 is hinged between the two ears 3a via a pivot shaft, thus forming a hinge with the support base 3. The rear end face of the connecting block 4 is an arc-shaped surface concentric with the pivot shaft. This arc-shaped surface allows the connecting block 4 to swing around the pivot shaft without interfering with the top surface of the support base 3. The clamping arm 5 is arranged vertically, and its middle part is hinged to the middle part of the connecting block 4. A clamping block 6 is fixedly connected to the bottom front end of the connecting block 4. A clamping gap for clamping the safety lock block 22 is formed between the lower end of the clamping arm 5 and the rear side of the clamping block 6. A mating groove 6a is provided between the rear side and the bottom of the clamping block 6, and the mating groove 6a extends through the clamping block 6 along the width direction of the connecting block 4. An elastic element 7 is provided between the clamping arm 5 and the connecting block 4. The elastic force of the elastic element 7 acts on the clamping arm 5, and the lower end of the clamping arm 5 is located in the mating groove 6a. The clamping arm 5 can swing away from the mating groove 6a by swinging in a direction that overcomes the elastic force of the elastic element 7.

[0037] Specifically, such as Figure 3 , Figure 4 and Figure 5 As shown, the front side of the clamping arm 5 includes a straight surface and an outwardly convex arc-shaped clamping surface 5a. The arc-shaped clamping surface 5a is located at the lower end of the clamping arm 5 and protrudes from the straight surface. The clamping arm 5 includes two arm bodies 5b, which are arranged opposite each other along the width direction of the connecting block 4 and located on both sides of the connecting block 4. The two arm bodies 5b are hinged to the connecting block 4 through the same hinge shaft 8. The upper ends of the two arm bodies 5b are fixedly connected through a connecting shaft 5c. The elastic element 7 is a tension spring, the front end of which is connected to the connecting shaft 5c. A connecting ear 4a protrudes from the upper side of the connecting block 4 near the rear end, and the rear end of the tension spring is connected to the connecting ear 4a.

[0038] like Figure 1 and Figure 2As shown, this welding fixture also includes a drive cylinder 9 fixed on the platform 1. The drive cylinder 9 is located on one side of the support base 3. A swing seat 10 is hinged to the top of the cylinder body of the drive cylinder 9. A pressing block 11 is provided on the swing seat 10. The pressing block 11 is strip-shaped. One end of the pressing block 11 is hinged to the piston rod of the drive cylinder 9, and the middle part of the pressing block 11 is hinged to the swing seat 10. The piston rod of the drive cylinder 9 can move upward to press the pressing block 11 onto the connecting block 4.

[0039] In this embodiment, as Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the clamping mechanism includes a mounting base 12 fixed on the platform 1, a clamping cylinder 13 fixed at the bottom of the platform 1, a linkage rod 14 passing through the platform 1, and a clamping arm 15 with one end hinged to the top of the mounting base 12. The lower end of the linkage rod 14 is fixedly connected to the piston rod of the clamping cylinder 13, and a stop pin 17 is provided on the upper side of the linkage rod 14. The other end of the clamping arm 15 is fixedly connected to a top pressure block 16. The clamping arm 15 can swing around the hinge point until the top pressure block 16 faces downward. When the clamping arm 15 is in the state where the top pressure block 16 faces downward, the piston rod of the clamping cylinder 13 moves downward so that the stop pin 17 presses on the upper side of the clamping arm 15. The mounting bases 12 in the two clamping mechanisms are arranged opposite to each other. Both mounting bases 12 are provided with through holes and the two through holes are arranged on the same center line. A limiting pin 18 is inserted into the through hole. A limiting screw 19 is provided on the side of the mounting base 12. A long strip-shaped limiting groove 18a is provided on the side of the limiting pin 18 along its length direction. The end of the limiting screw 19 is located in the limiting groove 18a.

[0040] This welding fixture assists in welding the frame 21 onto the housing 20 and spot welding the safety locking block 22 onto the housing 20, in the order of first welding the frame 21 and then the safety locking block 22. In use, first place the housing 20 on the platform 1 and position it using the positioning pins 2 inserted into the holes on the housing 20. Then place the frame 21 inside the housing 20, pull out the two limiting pins 18 from their respective through holes and insert them into the hinge holes of the two pivot pin brackets 21a on the frame 21. Finally, use the clamping mechanism to press the frame 21 onto the housing 20. The clamping mechanism presses the frame 21 as follows: Figure 7As shown, the clamping arm 15 is swung around the hinge point until the top pressure block 16 faces downwards, causing the top pressure block 16 to abut against the frame 21 inside the housing 20. Next, the stop pin 17 is inserted into the side of the linkage rod 14, and then the piston rod of the clamping cylinder 13 is controlled to move the linkage rod 14 downwards together, so that the stop pin 17 presses against the upper side of the clamping arm 15, thereby pressing the frame 21 against the housing 20. Then the welding of the frame 21 can begin. After the welding of the frame 21 is completed, the clamping mechanism is kept still, and then the spot welding of the safety lock block 22 on the housing 20 begins. The connecting block 4 is swung around the hinge point so that its outer end faces upwards, and then the safety lock block 22 is placed between the clamping block 6 and the lower end of the clamping arm 5, and the safety lock block 22 is fastened in the mating groove 6a through the locking groove 22a. Because an elastic element 7 is provided between the clamping arm 5 and the connecting block 4, the elastic force of the elastic element 7 acts on the clamping arm 5 to form a clamping force for clamping and fixing the safety lock block 22. Therefore, after the safety lock block 22 is placed between the clamping block 6 and the lower end of the clamping arm 5, the clamping force will make the safety lock block 22 firmly clamped and prevent it from falling off. Finally, the connecting block 4 is swung back around the hinge point to a horizontal position. At this time, the safety lock block 22 is exactly abutting against the designated position on the inner top wall of the housing 20. Then, the drive cylinder 9 is controlled to work, so that the pressing block 11 swings and presses against the connecting block 4. In this way, the connecting block 4 is pressed down to ensure that it will not move during the welding process. After that, the safety lock block 22 can be spot welded.

[0041] After spot welding is completed, the control cylinder 9 is activated to release the connecting block 4, and then the connecting block 4 is swung upward around the hinge point. At this time, although the safety lock block 22 and the housing 20 are fixed together by spot welding, the clamping arm 5 is hinged to the connecting block 4, and the clamping force that clamps the safety lock block 22 is formed by the elastic element 7 acting on the clamping arm 5. Therefore, during the upward swing of the outer end of the connecting block 4, the safety lock block 22, which is already fixed to the housing 20, will exert a squeezing force on the clamping arm 5. This will cause the clamping arm 5 to swing and move its lower end away from the clamping block 6. In this way, the clamping gap between the clamping block 6 and the lower end of the clamping arm 5 will be automatically widened, allowing the safety lock block 22 to automatically separate from the clamped structure.

[0042] Example 2

[0043] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that: in this embodiment, an adjustment block is provided on the connecting block 4 near the rear end. The adjustment block is provided with a strip-shaped adjustment groove along the length of the connecting block 4. The adjustment block and the connecting block 4 are fixed by fastening screws. The rod of the fastening screw passes through the adjustment groove and is threaded into the connecting block 4. The rear end of the tension spring is connected to the adjustment block.

[0044] Example 3

[0045] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that in this embodiment, the elastic element 7 is a torsion spring, which is sleeved on the hinge shaft 8. The two ends of the torsion spring act on the connecting block 4 and the clamping arm 5 respectively.

[0046] Example 4

[0047] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that in this embodiment, the upper end of the clamping block 6 is U-shaped, the front end of the connecting block 4 is located inside the upper end of the clamping block 6, and the side of the clamping block 6 is provided with a strip-shaped adjustment groove II along the length direction of the connecting block 4. The clamping block 6 and the connecting block 4 are fixed together by an adjustment screw. The rod of the adjustment screw passes through the adjustment groove II and is threaded into the front side of the connecting block 4.

[0048] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A welding fixture for a traction seat plate, comprising a platform (1) and a support seat (3) fixed on the platform (1), characterized in that, The welding fixture also includes a connecting block (4) and a clamping arm (5). The connecting block (4) is elongated and horizontally positioned. The rear end of the connecting block (4) is hinged to the top of the support base (3). The connecting block (4) can swing its front end upward around the hinge point. The clamping arm (5) is vertically positioned and its middle part is hinged to the middle part of the connecting block (4). A clamping block (6) is fixedly connected to the bottom of the front end of the connecting block (4). A mating groove (6a) is provided between the rear side and the bottom of the clamping block (6). The mating groove (6a) passes through the clamping block (6) along the width direction of the connecting block (4). The clamping arm (5) and An elastic element (7) is provided between the connecting blocks (4). The elastic force of the elastic element (7) acts on the clamping arm (5). The lower end of the clamping arm (5) is located in the mating groove (6a). The clamping arm (5) swings in the direction that overcomes the elastic force of the elastic element (7) so that the lower end of the clamping arm (5) moves away from the mating groove (6a). Two clamping mechanisms are provided on the platform (1). The two clamping mechanisms are arranged opposite each other and both clamping mechanisms can apply downward pressure. Several positioning columns (2) are provided on the platform (1) between the two clamping mechanisms. The support seat (3) is located on one side of the line connecting the two clamping mechanisms. The clamping mechanism includes The mounting base (12) is fixed on the platform (1), the clamping cylinder (13) is fixed at the bottom of the platform (1), the linkage rod (14) passes through the platform (1), and the clamping arm (15) is hinged at one end to the top of the mounting base (12). The lower end of the linkage rod (14) is fixedly connected to the piston rod of the clamping cylinder (13), and the upper side of the linkage rod (14) is provided with a stop pin (17). The other end of the clamping arm (15) is fixedly connected to a top pressure block (16). The clamping arm (15) can swing around the hinge point until the top pressure block (16) faces downwards, and the clamping arm (15) is in the state where the top pressure block (16) faces downwards. When the piston rod of the pressing cylinder (13) moves downward, the stop pin (17) can press against the upper side of the pressing arm (15). The mounting seats (12) in the two pressing mechanisms are arranged opposite to each other. Both mounting seats (12) are provided with through holes and the two through holes are arranged on the same center line. A limit pin (18) is inserted in the through hole. The linkage rod (14) is U-shaped. The limit pin (18) passes through the linkage rod (14). The side of the mounting seat (12) is provided with a limit screw (19). The side of the limit pin (18) is provided with a long strip-shaped limit groove (18a) along its length direction. The end of the limit screw (19) is located in the limit groove (18a).

2. The welding fixture for a traction seat plate according to claim 1, characterized in that, The front side of the clamping arm (5) includes a straight surface and an outwardly convex arc-shaped clamping surface (5a). The arc-shaped clamping surface (5a) is located at the lower end of the clamping arm (5) and protrudes from the straight surface.

3. The welding fixture for a traction seat plate according to claim 2, characterized in that, The clamping arm (5) includes two arm bodies (5b), which are arranged opposite to each other along the width direction of the connecting block (4) and located on both sides of the connecting block (4). The two arm bodies (5b) are hinged to the connecting block (4) through the same hinge shaft (8). The upper ends of the two arm bodies (5b) are fixedly connected through a connecting shaft (5c). The elastic element (7) is a tension spring, the front end of which is connected to the connecting shaft (5c), and the rear end of which acts on the connecting block (4).

4. The welding fixture for a traction seat plate according to claim 3, characterized in that, An adjustment block is provided on the connecting block (4) near the rear end. The adjustment block has a strip-shaped adjustment groove along the length of the connecting block (4). The adjustment block and the connecting block (4) are fixed together by fastening screws. The rod of the fastening screw passes through the adjustment groove and is threaded into the connecting block (4). The rear end of the tension spring is connected to the adjustment block.

5. A welding fixture for a traction seat plate according to claim 4, characterized in that, The upper end of the clamping block (6) is U-shaped, and the front end of the connecting block (4) is located inside the upper end of the clamping block (6). The side of the clamping block (6) is provided with a strip-shaped adjustment groove II along the length direction of the connecting block (4). The clamping block (6) and the connecting block (4) are fixed together by an adjustment screw. The rod of the adjustment screw passes through the adjustment groove II and is threaded into the front side of the connecting block (4).

6. A welding fixture for a traction seat plate according to claim 1, 2, 3, 4, or 5, characterized in that, The welding fixture also includes a drive cylinder (9) fixed on the platform (1). The drive cylinder (9) is located on one side of the support base (3). The top of the cylinder body of the drive cylinder (9) is hinged to a swing seat (10). A pressing block (11) is provided on the swing seat (10). The pressing block (11) is strip-shaped. One end of the pressing block (11) is hinged to the piston rod of the drive cylinder (9). The middle part of the pressing block (11) is hinged to the swing seat (10). The piston rod of the drive cylinder (9) moves upward so that the pressing block (11) presses on the connecting block (4).

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