A welding tool for a towing seat plate middle shell and a pull rod rotating support

Abstract

This invention provides a welding fixture for the housing and the rotating support of a traction seat plate, belonging to the field of mechanical technology. It solves the problem of ensuring the rotating support of the pull rod is welded to the accurate position. It includes a platform, a support fixed on the platform, a long, block-shaped rotating arm with its inner end hinged to the top of the support, and a positioning pin assembly. The rotating arm has a through hole in the vertical direction near its outer end. The positioning pin assembly is detachably connected to the through hole, with its lower end extending out of the through hole. A plate is inserted into the lower end of the positioning pin assembly, and the upper side of the plate and the lower side of the outer end of the rotating arm form a clamping distance for vertically clamping the rotating support of the pull rod. A limiting plate protruding from the lower side of the rotating arm is fixed to the outer end of the rotating arm. The limiting plate protruding from the lower side of the rotating arm and the outer side wall of the lower end of the positioning pin assembly form a clamping distance for clamping the rotating support of the pull rod along the length of the rotating arm. It has the advantages of high positioning accuracy before welding.

Description

Technical Field

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

[0002] With the continuous development of the transportation industry, 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, which are connected, pulled, and separated via a towing seat. The towing seat is mounted on the tractor unit, while the semi-trailer has a towing pin. The towing pin connects to the towing seat to achieve the connection between the tractor unit and the semi-trailer. The towing seat consists of a towing seat plate and a support. The towing seat plate is hinged to the support. The towing seat plate mainly includes a housing with a V-shaped mounting opening. Inside the housing, at the mounting opening, is a swingable locking hook, which is acted upon by a spring. The housing also contains a handle, a pull rod, and a wedge. The handle is movable, with one end extending outside the housing. One end of the pull rod is hinged inside the housing, and the other end of the handle is connected to the other end of the pull rod. The wedge is connected to the middle of the pull rod, pressing against the locking hook to limit its movement and prevent it from swinging under the action of the spring. When connecting the tractor truck and the semi-trailer, pull the handle outward to swing the lever, causing the wedge to disengage from the hook. The hook will then swing under the action of the spring, aligning its opening with the mounting opening. The semi-trailer's towing pin inserts into the hook's opening from the mounting opening. During this process, the towing pin will press the hook, causing it to rotate in a direction that overcomes the spring's action. This reverses the hook's opening, making it opposite to the mounting opening. Finally, push the handle inward and use the lever to swing the wedge until the hook is held in place again, keeping its opening opposite to the mounting opening.

[0003] Since the tie rod needs to be hinged to the housing, corresponding components need to be installed inside the housing for the tie rod to be hinged. For example... Figure 9 As shown, it includes a housing 15 and a tie rod rotating support 16 welded to the inner bottom wall of the housing 15. The tie rod rotating support 16 has a central hole for the tie rod to be hinged. Currently, the welding of the housing 15 and the tie rod rotating support 16 is done by workers using a ruler to measure and mark the position on the inner bottom wall of the housing 15 (the measured position is based on the design drawings), and then welding is performed after the tie rod rotating support 16 is placed against the marked position. However, in today's efficiency-oriented society, measuring and marking the position of each item in mass production would obviously take a lot of time and result in low production efficiency. At the same time, the inner bottom wall of the housing 15 is actually uneven, that is, it is not a flat horizontal surface. This means that the method of measuring and marking the position will have a large error, making it difficult to ensure that the tie rod rotating support 16 is accurately welded to the specified position required by the design drawings. 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 the housing and the rotating support of the tie rod in the traction seat plate. This fixture solves the problems of low production efficiency and difficulty in ensuring that the rotating support of the tie rod is welded in the accurate position.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A welding fixture for a traction seat plate housing and a pull rod rotating support includes a platform and a support fixed on the platform. The welding fixture further includes a rotating arm and a positioning pin assembly. The rotating arm is a long, block-shaped structure, horizontally positioned with its inner end hinged to the top of the support. The rotating arm can swing its outer end upwards around the hinge point. A through hole is provided vertically near the outer end of the rotating arm. The positioning pin assembly is detachably connected to the through hole, with its lower end extending out of the through hole. A plate is inserted into the lower end of the positioning pin assembly, and a clamping distance is formed between the upper side of the plate and the lower side of the outer end of the rotating arm for clamping the pull rod rotating support vertically. A limiting plate is fixedly connected to the outer end of the rotating arm, protruding from the lower side of the rotating arm. A clamping distance is formed between the limiting plate protruding from the lower side of the rotating arm and the outer side wall of the lower end of the positioning pin assembly for clamping the pull rod rotating support along the length of the rotating arm.

[0007] In use, first position the housing on the platform, swing the rotating arm around the hinge point so that its outer end is upward, and remove the insert plate from the lower end of the positioning pin assembly. Then, fit the pull rod rotating support through its central hole with the opening facing downwards onto the lower end of the positioning pin assembly. Because the limiting plate protrudes from the lower side of the rotating arm, and the limiting plate protruding from the lower side of the rotating arm forms a clamping distance with the lower outer wall of the positioning pin assembly for clamping the pull rod rotating support along the length of the rotating arm, the pull rod rotating support will abut against the limiting plate after being fitted onto the lower end of the positioning pin assembly. This clamps the pull rod rotating support along the length of the rotating arm and restricts its circumferential position. Next, the insert plate is re-inserted into the lower end of the locating pin assembly. Since the upper side of the insert plate and the lower side of the outer end of the rotating arm form a clamping distance for vertically holding the pull rod rotating support, after the pull rod rotating support is fitted onto the lower end of the locating pin assembly and the insert plate is re-inserted into the lower end of the locating pin assembly, the insert plate and the rotating arm will cooperate to clamp the pull rod rotating support vertically. Finally, the rotating arm is swung back around the hinge point to a horizontal position. At this point, the pull rod rotating support is exactly against the designated position on the inner bottom wall of the housing, and welding can then begin. After welding, because the pull rod rotating support and the housing are welded and fixed together, and the pull rod rotating support is fitted onto the lower end of the locating pin assembly and clamped between the insert plate and the rotating arm, the welding fixture and the pull rod rotating support cannot be disengaged (at this point, the locating pin assembly cannot be removed from the through hole due to the obstruction of the insert plate). At this point, the worker can first pull the insert plate out from the lower end of the positioning pin assembly so that the pull rod rotating support is no longer clamped. This also releases the positioning pin assembly. Then the positioning pin assembly can be removed from the through hole, thereby disconnecting the connection between the pull rod rotating support and the welding fixture.

[0008] This welding fixture allows for the accurate and secure positioning of the pull rod rotating support at a designated location on the inner bottom wall of the housing before welding (in practice, only the orientation of the support base and rotating arm needs to be determined beforehand). The positioning pin assembly and the limiting plate work together to clamp the pull rod rotating support along the length of the rotating arm and position it circumferentially, ensuring the support won't tilt during welding. The rotating arm and the insert plate work together to clamp the support vertically, preventing it from jumping and causing incomplete welds. This ensures that each pull rod rotating support is accurately welded to its designated position on the inner bottom wall of the housing during mass production. 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.

[0009] In the welding fixture for the housing and the rotating support of the tie rod in the aforementioned traction seat plate, the positioning pin assembly includes a positioning sleeve and a limiting rod. The positioning sleeve is located in the through hole and its lower end extends out of the through hole. The lower end of the positioning sleeve is a sleeve end. The limiting rod passes through the positioning sleeve and can slide up and down relative to the positioning sleeve. An insert plate is inserted at the lower end of the limiting rod. A support spring is sleeved on the upper end of the limiting rod. A stop is fixedly connected to the upper end of the limiting rod. The two ends of the support spring abut against the upper end of the positioning sleeve and the stop, respectively.

[0010] In operation, the pull rod rotating support is fitted onto the lower end of the positioning sleeve and abuts against the limiting plate. Then, the insert plate is inserted into the lower side of the limiting rod. Since the upper end of the limiting rod is fitted with a support spring, and the two ends of the support spring abut against the upper end of the positioning sleeve and the stop fixedly connected to the upper end of the limiting rod, the elastic force of the support spring will act upward on the limiting rod, so that the limiting plate always has an upward tendency. Therefore, after the insert plate is inserted into the lower side of the limiting rod, it will press tightly against the inner top wall of the pull rod rotating support and press the pull rod rotating support against the lower side of the rotating arm.

[0011] The above-mentioned settings allow the tie rod swivel support to be more securely fixed, ensuring the welding accuracy of the tie rod swivel support at the designated position on the inner bottom wall of the housing.

[0012] In the welding fixture for the housing and the rotating support of the tie rod in the aforementioned traction seat plate, as another technical solution, the positioning pin assembly includes a positioning sleeve and a limiting rod. The positioning sleeve is located inside the through hole and its lower end extends out of the through hole. The lower end of the positioning sleeve is a sleeve end. The limiting rod passes through the positioning sleeve and the two are threadedly connected. The insert plate can be inserted outside the lower end of the limiting rod. The upper end of the limiting rod has a non-circular operating part.

[0013] In operation, the pull rod swivel support is fitted onto the lower end of the positioning sleeve and abuts against the limiting plate. Then, the insert plate is inserted into the lower side of the limiting rod. Since the limiting rod passes through the positioning sleeve and the two are threadedly connected, rotating the limiting rod will cause it to rotate and move upward along the thread. As the limiting rod moves upward, the insert plate will press tightly against the inner top wall of the pull rod swivel support and press the pull rod swivel support against the lower side of the rotating arm.

[0014] The above-mentioned settings allow the tie rod swivel support to be more securely fixed, ensuring the welding accuracy of the tie rod swivel support at the designated position on the inner bottom wall of the housing.

[0015] In the welding fixture for the housing and the rotating support of the tie rod in the aforementioned traction seat plate, the through hole is a smooth hole, the upper end of the positioning sleeve extends out of the through hole, the outer side of the upper end of the positioning sleeve has a shoulder, the shoulder abuts against the upper side of the rotating arm, the lower end of the limiting rod has an annular protrusion on the outer periphery, one end of the insert plate is U-shaped, and the outer diameter of the annular protrusion is smaller than the outer diameter of the positioning sleeve.

[0016] One end of the insert plate is U-shaped, allowing it to be inserted outside the lower end of the limiting rod. An annular shoulder is provided on the outer periphery of the lower end of the limiting rod. When the insert plate is inserted into the lower end of the limiting rod, it can abut against the annular shoulder. Thus, when the limiting rod moves upward, the annular shoulder will pull the insert plate upward, thereby firmly pressing the pull rod rotating support against the lower side of the rotating arm.

[0017] The positioning sleeve simply passes through the through hole. The shoulder on the outer side of the upper end of the positioning sleeve abuts against the upper side of the rotating arm, preventing the positioning pin assembly from falling out of the through hole from below. Furthermore, after a plate is inserted into the lower end of the limiting rod, clamping and fixing the pull rod rotating support between the lower side of the rotating arm and the plate, the positioning pin cannot fall out of the through hole from above. After removing the plate, by controlling the limiting rod to move upwards, the annular shoulder abuts against the lower end of the positioning sleeve, allowing the positioning sleeve to be pulled out of the through hole. The outer diameter of the annular shoulder is smaller than the outer diameter of the positioning sleeve, ensuring that the annular shoulder does not obstruct the positioning sleeve from being removed from the through hole from above. This design is very convenient in operation.

[0018] In the welding fixture for the housing and the rotating support of the tie rod in the aforementioned traction seat plate, as another technical solution, the positioning sleeve is threadedly connected in the through hole.

[0019] The positioning sleeve is threaded into the through hole. After welding, it can be removed from the through hole by rotating the positioning sleeve, thus allowing the welding fixture to be disconnected from the tie rod rotating support that is welded and fixed to the bottom inner wall of the housing. This design is very convenient in operation.

[0020] In the welding fixture for the housing and the rotating support of the tie rod in the aforementioned traction seat plate, the limiting plate is L-shaped. The horizontal part of the limiting plate abuts against the upper side of the outer end of the rotating arm. The horizontal part of the limiting plate is provided with a strip hole along the length of the rotating arm. The limiting plate and the rotating arm are fixed together by adjusting screws that pass through the strip hole and are threaded into the rotating arm.

[0021] The vertical portion of the limiting plate restricts the free rotation of the pull rod rotating support after it is fitted onto the lower end of the locating pin assembly, and also directly positions the circumferential angle of the pull rod rotating support. A slotted hole is provided along the length of the rotating arm on the horizontal portion of the limiting plate, and the limiting plate and rotating arm are fixed together by an adjusting screw passing through the slotted hole and threaded into the rotating arm. Thus, when the adjusting screw is loosened, the distance between the vertical portion of the limiting plate and the centerline of the locating pin assembly can be adjusted by moving the limiting plate along the length of the rotating arm, ensuring better positioning of the circumferential angle of the pull rod rotating support.

[0022] In the welding fixture for the housing and the rotating support of the traction seat plate mentioned above, the inner end of the rotating arm abuts against the top surface of the support seat, the top of the support seat is provided with a hinge ear, the rotating arm is hinged to the hinge ear through a hinge shaft, and the inner end face of the rotating arm is an arc-shaped surface concentric with the hinge shaft.

[0023] The above settings ensure that the inner end of the rotating arm does not interfere with the top surface of the support base, thus allowing the rotating arm to swing around the hinge point.

[0024] In the welding fixture for the housing and the rotating support of the tie rod in the aforementioned traction seat plate, the welding fixture further includes a clamping cylinder fixed on the platform. The clamping cylinder is located on one side of the support seat. A hinge seat is hinged to the top of the cylinder body of the clamping cylinder. A clamping arm is provided on the hinge seat. One end of the clamping arm is hinged to the piston rod of the clamping cylinder, and the middle part of the clamping arm is hinged to the hinge seat. The upward movement of the piston rod of the clamping cylinder can cause the clamping arm to press against the upper side of the inner end of the rotating arm.

[0025] Before welding begins, the piston rod of the clamping cylinder moves upward. Since one end of the clamping arm is hinged to the piston rod of the clamping cylinder and the middle part of the clamping arm is hinged to the hinge seat, the other end of the clamping arm swings downward and presses against the upper side of the inner end of the rotating arm. This keeps the rotating arm stationary during welding, thus preventing the tie rod rotating support from jumping and causing incomplete welds, and improving welding accuracy.

[0026] Compared with existing technologies, the welding fixture for the housing and the rotating support of the tie rod in this traction seat plate has the following advantages:

[0027] 1. By using the rotating arm, positioning pin assembly, limiting plate, and insert plate, the pull rod rotating support can be accurately and firmly positioned at a designated location on the inner bottom wall of the housing before welding. The positioning pin assembly and the limiting plate work together to clamp the pull rod rotating support along the length of the rotating arm and position it circumferentially, ensuring that the pull rod rotating support will not tilt during welding. The rotating arm and the insert plate work together to clamp the pull rod rotating support vertically, ensuring that the pull rod rotating support will not jump during welding and cause incomplete welds. Thus, in mass production, it is ensured that each pull rod rotating support can be accurately welded to a designated location on the inner bottom wall of each housing.

[0028] 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. Attached Figure Description

[0029] Figure 1 This is a three-dimensional schematic diagram of the welding fixture for the housing and the rotating support of the tie rod in use.

[0030] Figure 2 This is a three-dimensional schematic diagram of the welding fixture for the housing and the rotating support of the tie rod in use from another angle.

[0031] Figure 3 This is a sectional view of the welding fixture for the housing and the rotating support of the tie rod in use.

[0032] Figure 4 yes Figure 3 A magnified view of a portion of the image.

[0033] Figure 5 yes Figure 3 Sectional view along the AA direction.

[0034] Figure 6 yes Figure 5 A magnified view of a portion of the image.

[0035] Figure 7 This is a three-dimensional schematic diagram of the tie rod swivel support after it has been clamped and fixed.

[0036] Figure 8 This is a three-dimensional schematic diagram from another angle after the tie rod swivel support is clamped and fixed.

[0037] Figure 9 This is a three-dimensional schematic diagram of the traction seat plate.

[0038] In the diagram, 1 is the platform; 2 is the support base; 2a is the hinge ear; 3 is the positioning pin; 4 is the rotating arm; 4a is the through hole; 5 is the positioning pin assembly; 6 is the insert plate; 7 is the limit plate; 8 is the clamping cylinder; 9 is the hinge base; 10 is the clamping arm; 11 is the positioning sleeve; 11a is the shoulder; 12 is the limit rod; 12a is the annular shoulder; 13 is the stop; 14 is the support spring; 15 is the housing; and 16 is the pull rod rotating support. Detailed Implementation

[0039] 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.

[0040] Example 1

[0041] like Figures 1-8 As shown, a welding fixture for the housing and the rotating support of a traction seat plate includes a platform 1 and a support 2 fixed on the platform 1. Several positioning pins 3 are also fixedly installed on the platform 1. It also includes a rotating arm 4 and a positioning pin assembly 5. The rotating arm 4 is a long, block-shaped structure. The rotating arm 4 is horizontally arranged and one end is hinged to the top of the support 2. The rotating arm 4 can swing its outer end upward around the hinge point. The inner end of the rotating arm 4 abuts against the top surface of the support 2. The top of the support 2 has a protruding hinge ear 2a. The rotating arm 4 is hinged to the hinge ear 2a by a hinge shaft. The inner end face of the rotating arm 4 is an arc-shaped surface concentric with the hinge shaft. This arrangement ensures that the inner end of the rotating arm 4 does not interfere with the top surface of the support 2, thus ensuring that the rotating arm 4 can swing around the hinge point. A through hole 4a is provided vertically near the outer end of the rotating arm 4. The positioning pin assembly 5 is detachably connected to the through hole 4a. The lower end of the positioning pin assembly 5 extends out of the through hole 4a. An insert plate 6 is inserted into the lower end of the positioning pin assembly 5. The insert plate 6 is elongated and one end is U-shaped. The upper side of the insert plate 6 and the lower side of the outer end of the rotating arm 4 form a clamping distance for clamping the pull rod rotating support 16 vertically. A limiting plate 7 is fixedly connected to the outer end of the rotating arm 4. The limiting plate 7 is a flat plate and is welded and fixed to the outer end of the rotating arm 4. The limiting plate 7 protrudes from the lower side of the rotating arm 4. The limiting plate 7 protruding from the lower side of the rotating arm 4 and the lower outer side wall of the positioning pin assembly 5 form a clamping distance for clamping the pull rod rotating support 16 along the length direction of the rotating arm 4.

[0042] Specifically, such as Figure 4 , Figure 6 , Figure 7 and Figure 8As shown, the positioning pin assembly 5 includes a positioning sleeve 11 and a limiting rod 12. The positioning sleeve 11 is located inside the through hole 4a and its lower end extends out of the through hole 4a. The lower end of the positioning sleeve 11 is a sleeve end. The limiting rod 12 passes through the positioning sleeve 11 and can slide up and down relative to the positioning sleeve 11. The insert plate 6 is inserted into the lower end of the limiting rod 12. A support spring 14 is sleeved on the upper end of the limiting rod 12, and a stop 13 is fixed to the upper end of the limiting rod 12. The two ends of the support spring 14 abut against the upper end of the positioning sleeve 11 and the stop 13, respectively. In this embodiment, an annular shoulder 12a is provided on the outer periphery of the lower end of the limiting rod 12. The outer diameter of the annular shoulder 12a is smaller than the outer diameter of the positioning sleeve 11. One end of the insert plate 6 is U-shaped. When the limiting rod 12 is not inserted with the insert plate 6, the annular shoulder 12a abuts against the lower end face of the positioning sleeve 11. The through hole 4a is a light hole. The upper end of the positioning sleeve 11 extends out of the through hole 4a. The outer side of the upper end of the positioning sleeve 11 has a shoulder 11a, which abuts against the upper side of the rotating arm 4.

[0043] like Figure 1 and Figure 2 As shown, this welding fixture also includes a clamping cylinder 8 fixed on the platform 1. The clamping cylinder 8 is located on one side of the support base 2. The top of the cylinder body of the clamping cylinder 8 is hinged to a hinge seat 9. A clamping arm 10 is provided on the hinge seat 9. One end of the clamping arm 10 is hinged to the piston rod of the clamping cylinder 8, and the middle part of the clamping arm 10 is hinged to the hinge seat 9. The upward movement of the piston rod of the clamping cylinder 8 can cause the clamping arm 10 to press against the upper side of the inner end of the rotating arm 4.

[0044] In use, first place the housing 15 on the platform 1 and use each positioning pin 3 to insert into the hole on the housing 15 for positioning (in practice, a clamping device can be set on the platform 1 to press the housing 15 on the platform 1). Swing the rotating arm 4 around the hinge point so that its outer end swings upward. Then install the positioning pin assembly 5 into the through hole 4a at the outer end of the rotating arm 4. The insert plate 6 is not inserted at the lower end of the positioning pin assembly 5. Next, the pull rod rotating support 16 is fitted onto the lower end of the positioning sleeve 11 with its opening facing downward through its own central hole, and abuts against the limiting plate 7. Since the limiting plate 7 protrudes from the lower side of the rotating arm 4, and the limiting plate 7 protruding from the lower side of the rotating arm 4 and the lower outer wall of the positioning pin assembly 5 form a clamping distance for clamping the pull rod rotating support 16 along the length direction of the rotating arm 4, the pull rod rotating support 16 will abut against the limiting plate 7 after it is fitted onto the lower end of the positioning pin assembly 5. In this way, the position of the pull rod rotating support 16 along the length direction of the rotating arm 4 is clamped, and the circumferential position of the pull rod rotating support 16 is restricted. Next, the insert plate 6 is inserted into the lower side of the limiting rod 12 and abuts against the annular shoulder 12a. Since the upper side of the insert plate 6 and the lower side of the outer end of the rotating arm 4 form a clamping distance for clamping the pull rod rotating support 16 in the vertical direction, after the pull rod rotating support 16 is fitted into the lower end of the positioning sleeve 11 in the positioning pin assembly 5 and the insert plate 6 is re-inserted into the lower end of the limiting rod 12 of the positioning pin assembly 5, the insert plate 6 and the rotating arm 4 cooperate to clamp the pull rod rotating support 16 in the vertical direction. And since the elastic force of the support spring 14 acts upward on the limiting rod 12, the limiting plate 7 always has an upward tendency. Therefore, after the insert plate 6 is inserted into the lower side of the limiting rod 12, it will tightly abut against the inner top wall of the pull rod rotating support 16. In this way, the lower side of the rotating arm 4 and the insert plate 6 together firmly clamp and fix the pull rod rotating support 16. Finally, swing the rotating arm 4 around the hinge point until it is in a horizontal state. At this time, the pull rod rotating support 16 is exactly against the designated position on the inner bottom wall of the housing 15. Then control the clamping cylinder 8 to work, so that the clamping arm 10 swings and presses against the inner end upper side of the rotating arm 4. In this way, the rotating arm 4 is pressed down to ensure that it will not move during the welding process. Then the welding work can begin.

[0045] After welding is completed, the clamping cylinder 8 is activated to release the rotating arm 4. Since the pull rod rotating support 16 and the housing 15 are already fixed together by welding, and the pull rod rotating support 16 is fitted over the lower end of the positioning sleeve 11 and fixed by the lower side of the rotating arm 4 and the insert plate 6, the rotating arm 4 cannot swing at this time. Next, the operator can first press down the limiting rod 12 to loosen the insert plate 6 from the pull rod rotating support 16, and then remove the insert plate 6 from the limiting rod 12. At this time, the pull rod rotating support 16 is no longer clamped and fixed. Finally, the connection between the pull rod rotating support 16 and the welding fixture can be released simply by removing the positioning pin assembly 5 from the through hole 4a. In this embodiment, the positioning pin assembly 5 is removed from the through hole 4a as follows: After the insert plate 6 is removed from the limiting rod 12, the annular shoulder 12a abuts against the lower end of the positioning sleeve 11 under the elastic force of the supporting spring 14. The positioning sleeve 11 is only inserted into the through hole 4a. Therefore, when the limiting rod 12 is lifted, the positioning sleeve 11 can be pulled out from the through hole 4a by the mutual abutment between the annular shoulder 12a and the positioning sleeve 11.

[0046] Example 2

[0047] This embodiment is basically the same as the first embodiment in terms of structure and principle, except that: in this embodiment, the positioning pin assembly 5 includes a positioning sleeve 11 and a limiting rod 12. The positioning sleeve 11 is located inside the through hole 4a and its lower end extends out of the through hole 4a. The lower end of the positioning sleeve 11 is a sleeve end. The limiting rod 12 passes through the positioning sleeve 11 and the two are threaded together. The insert plate 6 can be inserted outside the lower end of the limiting rod 12. The outer periphery of the lower end of the limiting rod 12 is provided with an annular shoulder 12a. The outer diameter of the annular shoulder 12a is smaller than the outer diameter of the positioning sleeve 11. One end of the insert plate 6 is U-shaped. The upper end of the limiting rod 12 has a non-circular operating part.

[0048] The pull rod rotating support 16, with its central hole facing downwards, is fitted onto the lower end of the positioning sleeve 11 and abuts against the limiting plate 7. The insert plate 6 is then inserted outside the lower end of the limiting rod 12 and abuts against the annular shoulder 12a. The tool is then placed outside the operating part, and the limiting rod 12 is rotated. Since the limiting rod 12 is threadedly connected to the positioning sleeve 11, it rotates and moves upwards along the thread. As the limiting rod 12 moves upwards, the insert plate 6 presses against the inner top wall of the pull rod rotating support 16, thus the lower side of the rotating arm 4, together with the insert plate 6, firmly clamps and fixes the pull rod rotating support 16. After welding, simply rotating the limiting rod 12 in the opposite direction releases the insert plate 6 from the pull rod rotating support 16.

[0049] Example 3

[0050] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that in this embodiment, the limiting plate 7 is L-shaped, the horizontal part of the limiting plate 7 abuts against the upper side of the outer end of the rotating arm 4, the horizontal part of the limiting plate 7 is provided with a strip hole along the length of the rotating arm 4, and the limiting plate 7 and the rotating arm 4 are fixed together by an adjusting screw that passes through the strip hole and is threaded into the rotating arm 4.

[0051] The vertical portion of the limiting plate 7 restricts the free rotation of the pull rod rotating support 16 after it is fitted onto the lower end of the positioning pin assembly 5, and also directly positions the circumferential angle of the pull rod rotating support 16. By providing a strip-shaped hole along the length of the rotating arm 4 on the horizontal portion of the limiting plate 7, and fixing the limiting plate 7 and the rotating arm 4 together with an adjusting screw that passes through the strip-shaped hole and is threaded into the rotating arm 4, the distance between the vertical portion of the limiting plate 7 and the center line of the positioning pin assembly 5 can be adjusted by moving the limiting plate 7 along the length of the rotating arm 4 when the adjusting screw is loosened, thus ensuring better positioning of the circumferential angle of the pull rod rotating support 16.

[0052] Example 4

[0053] This embodiment is basically the same as the first embodiment in terms of structure and principle, except that in this embodiment, the positioning sleeve 11 is threaded into the through hole 4a. Since the positioning sleeve 11 is threaded into the through hole 4a, after welding is completed, it can be removed from the through hole 4a by rotating the positioning sleeve 11.

[0054] 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 the housing and the rotating support of the tie rod in a traction seat plate, comprising a platform (1) and a support seat (2) fixed on the platform (1), characterized in that, The welding fixture also includes a rotating arm (4) and a positioning pin assembly (5). The rotating arm (4) is a long, block-shaped structure. The rotating arm (4) is horizontally positioned and its inner end is hinged to the top of the support base (2). The rotating arm (4) can swing its outer end upward around the hinge point. The rotating arm (4) has a through hole (4a) in the vertical direction near the outer end. The positioning pin assembly (5) is detachably connected to the through hole (4a) and its lower end extends out of the through hole (4a). The lower end of the positioning pin assembly (5) is inserted with a pin. The upper side of the plate (6) and the lower side of the outer end of the rotating arm (4) form a clamping distance for clamping the pull rod rotating support (16) in the vertical direction. The outer end of the rotating arm (4) is fixedly connected to a limiting plate (7). The limiting plate (7) protrudes from the lower side of the rotating arm (4). The limiting plate (7) protruding from the lower side of the rotating arm (4) and the lower outer side wall of the positioning pin assembly (5) form a clamping distance for clamping the pull rod rotating support (16) in the length direction of the rotating arm (4).

2. The welding fixture for the housing and the rotating support of the tie rod in a traction seat plate according to claim 1, characterized in that, The positioning pin assembly (5) includes a positioning sleeve (11) and a limiting rod (12). The positioning sleeve (11) is located inside the through hole (4a) and its lower end extends out of the through hole (4a). The lower end of the positioning sleeve (11) is a sleeve end. The limiting rod (12) passes through the positioning sleeve (11) and the limiting rod (12) can slide up and down relative to the positioning sleeve (11). The insert plate (6) is inserted at the lower end of the limiting rod (12). The upper end of the limiting rod (12) is covered with a support spring (14). The upper end of the limiting rod (12) is fixedly connected with a stop (13). The two ends of the support spring (14) abut against the upper end of the positioning sleeve (11) and the stop (13) respectively.

3. The welding fixture for the housing and the rotating support of the tie rod in a traction seat plate according to claim 1, characterized in that, The positioning pin assembly (5) includes a positioning sleeve (11) and a limiting rod (12). The positioning sleeve (11) is located inside the through hole (4a) and its lower end extends out of the through hole (4a). The lower end of the positioning sleeve (11) is a sleeve end. The limiting rod (12) passes through the positioning sleeve (11) and the two are threaded together. The insert plate (6) can be inserted outside the lower end of the limiting rod (12). The upper end of the limiting rod (12) has a non-circular operating part.

4. The welding fixture for the housing and the rotating support of the tie rod in a traction seat plate according to claim 2 or 3, characterized in that, The through hole (4a) is a light hole. The upper end of the positioning sleeve (11) extends out of the through hole (4a). The upper end of the positioning sleeve (11) has a shoulder (11a) on the outer side. The shoulder (11a) abuts against the upper side of the rotating arm (4). The lower end of the limiting rod (12) has an annular shoulder (12a) on its outer periphery. One end of the insert plate (6) is U-shaped. The outer diameter of the annular shoulder (12a) is smaller than the outer diameter of the positioning sleeve (11).

5. The welding fixture for the housing and the rotating support of the tie rod in a traction seat plate according to claim 2 or 3, characterized in that, The positioning sleeve (11) is threaded into the through hole (4a).

6. The welding fixture for the housing and the rotating support of the tie rod in a traction seat plate according to claim 1, characterized in that, The limiting plate (7) is L-shaped. The horizontal part of the limiting plate (7) abuts against the upper side of the outer end of the rotating arm (4). The horizontal part of the limiting plate (7) has a strip hole along the length direction of the rotating arm (4). The limiting plate (7) and the rotating arm (4) are fixed together by adjusting screws that pass through the strip hole and are threaded into the rotating arm (4).

7. The welding fixture for the housing and the rotating support of the tie rod in a traction seat plate according to claim 6, characterized in that, The inner end of the rotating arm (4) abuts against the top surface of the support base (2). The top of the support base (2) is provided with a hinge ear (2a). The rotating arm (4) is hinged to the hinge ear (2a) through a hinge shaft. The inner end face of the rotating arm (4) is an arc-shaped surface that is concentric with the hinge shaft.

8. The welding fixture for the housing and the rotating support of the tie rod in a traction seat plate according to claim 1, characterized in that, The welding fixture also includes a clamping cylinder (8) fixed on the platform (1). The clamping cylinder (8) is located on one side of the support base (2). The top of the cylinder body of the clamping cylinder (8) is hinged to a hinge seat (9). A clamping arm (10) is provided on the hinge seat (9). One end of the clamping arm (10) is hinged to the piston rod of the clamping cylinder (8). The middle part of the clamping arm (10) is hinged to the hinge seat (9). The upward movement of the piston rod of the clamping cylinder (8) can cause the clamping arm (10) to press against the upper side of the inner end of the rotating arm (4).

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