A welding tool for the housing and the anti-reverse guide seat in the towing seat plate

Abstract

The present invention provides a welding tool for a housing and a backstop guide seat in a towing seat plate, belonging to the technical field of tooling fixtures. It solves the problems of low efficiency during mass production and difficulty in ensuring that the backstop guide seat is welded to the accurate position. It includes a positioning rod and a mating rod. The mating rod passes through the positioning rod. An abutting shoulder is provided on the outer side of the inner end of the positioning rod. A first positioning spring is sleeved on the inner end of the positioning rod. An abutting step is provided on the outer end of the positioning rod. A first annular blocking member is fixedly connected to the inner end of the mating rod. A second annular blocking member is fixedly connected to the outer end of the mating rod. A second positioning spring is sleeved on the mating rod between the first annular blocking member and the abutting shoulder. An annular card slot is provided on the outer side of the middle region of the positioning rod along its length direction. It further includes a limit insertion plate that can be inserted into the annular card slot and a positioning insertion plate that can be inserted between the outer end of the positioning rod and the mating rod outside the second annular blocking member. It has the advantages of being able to weld the backstop guide seat to the accurate position, etc.

Description

Technical Field

[0001] The invention belongs to the technical field of workholding fixtures, and relates to a welding fixture for a housing and a backstop guide seat in a drawbar plate. Background Art

[0002] A drawbar is a load-carrying component used by a freight tractor to tow a semi-trailer. The drawbar mainly consists of a drawbar plate, a separation-connection mechanism, and a support. As Figure 8 shown is a drawbar plate, which includes a housing 10, and two pivot brackets 11, a front plate 12, a rear plate 13, and a backstop guide seat 14 that are all welded and fixed to the housing 10. The front plate 12 and the rear plate 13 are arranged opposite to each other. One pivot bracket 11 is located between one end of the front plate 12 and the rear plate 13, and the other pivot bracket 11 is located between the other end of the front plate 12 and the rear plate 13. Both pivot brackets 11 are welded to the front plate 12 and the rear plate 13. The backstop guide seat 14 is located between the two pivot brackets 11. The backstop guide seat 14 is close to one of the pivot brackets 11 and close to the rear plate 13. One side of the backstop guide seat 14 facing the other pivot bracket 11 has a pair of parallel lugs 14a, and the lugs 14a are parallel to the rear plate 13. Among them, the two pivot brackets 11 are used to be hinged to the support in the drawbar. The pivot bracket 11 is also provided with a guide hole 11a. The backstop guide seat 14 has a through hole opposite to the guide hole 11a. The guide hole 11a and the through hole are used to pass through the backstop rod in the separation-connection mechanism (the diameter of the guide hole is larger than the diameter of the through hole. In practice, a bushing will be arranged in the guide hole). Specifically, the state of the drawbar plate during use is, for example, as shown in the attached Figure 2 shown in the patent application No. 201120185966.9 for a clearance-free vehicle drawbar.

[0003] Currently, for the welding of the backstop guide seat 14 and the housing 10, first, the staff measures the welding position of the backstop guide seat 14 on the housing 10 according to the dimensions in the design drawing with a ruler and makes a mark, and then the staff abuts the backstop guide seat 14 against the marked position on the housing 10 and performs welding. However, the housing 10 is not a complete flat plate, and there are uneven places on it, which makes it have a relatively large error when measuring the position with a ruler, and this simple way of marking the position is also difficult to ensure accuracy, resulting in the backstop guide seat 14 being difficult to be welded to the accurate position in practice. At the same time, in batch production, measuring the position and making a mark every time will obviously also make the production efficiency very low. Summary of the Invention

[0004] The object of the present invention is to address the above problems existing in the prior art, and a welding tooling for the housing and the anti-retreat guide seat in the traction seat plate is proposed, which solves the problems of low efficiency during mass production and difficulty in ensuring that the anti-retreat guide seat is welded to the accurate position.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] A welding tooling for the housing and the anti-retreat guide seat in the traction seat plate, including a round rod-shaped positioning rod. The two ends of the positioning rod are respectively an inner end and an outer end. It is characterized in that the welding tooling further includes a round rod-shaped mating rod. The mating rod axially passes through the positioning rod. An abutting shoulder is provided on the outer side of the inner end portion of the positioning rod. A first positioning spring is sleeved on the inner end of the positioning rod. An abutting step is provided on the outer end portion of the positioning rod. A first annular blocking member is fixedly connected to the inner end portion of the mating rod. A second annular blocking member is fixedly connected to the outer end portion of the mating rod. A second positioning spring is sleeved on the mating rod between the first annular blocking member and the abutting shoulder. An annular card slot is provided on the outer side of the middle region of the positioning rod along its length direction. The welding tooling further includes a limit insertion plate that can be inserted at the annular card slot and a positioning insertion plate that can be inserted outside the mating rod between the outer end portion of the positioning rod and the second annular blocking member.

[0007] During use, first fixedly connect the first annular blocking member to the inner end portion of the mating rod and sleeve the second spring on the inner end of the mating rod. Then, pass the mating rod through the positioning rod from the inner end to the outer end direction and fixedly connect the second annular blocking member to the outer end portion of the mating rod. Next, sleeve the first spring on the inner end of the positioning rod. After that, position the housing on the table plate, pass the positioning rod from the inner end to the outer end direction through the guiding hole of the rotating pin frame (the outer diameter of the positioning rod matches the aperture of the guiding hole of the rotating pin frame), and insert the limit insertion plate outside the annular card slot of the positioning rod. In this way, the first spring will abut between one side of the rotating pin frame and the abutting step, and the elastic force of the first spring will act on the positioning rod to make the limit insertion plate abut against the other side of the rotating pin frame, so that the positioning rod and the rotating pin frame are axially fixed together. Then, sleeve and abut the anti-retreat guide seat on the outer end portion of the positioning rod, and then insert the positioning insertion plate outside the mating rod between the outer end portion of the positioning rod and the second annular blocking member. Since the second spring abuts between the first annular blocking member and the abutting shoulder of the positioning rod, when the positioning rod and the rotating pin frame are axially fixed together, the elastic force of the second spring will act on the first annular blocking member, making the entire mating rod always tend to move forward in the inner end direction. In this way, the positioning insertion plate will abut against the anti-retreat guide seat, and the axial position of the anti-retreat guide seat will be fixed.

[0008] By setting up the welding fixture, the backstop guide seat can be accurately and firmly positioned at the designated position on the shell before welding, especially the positioning rod uses the guide hole of the rotating pin frame for positioning and the backstop guide seat uses the abutment step of the outer end of the positioning rod for positioning, so the coaxiality of the center hole of the backstop guide seat and the guide hole of the rotating pin frame can be well guaranteed. In addition, the welding fixture is very convenient to operate, and compared with the prior art that relies on measuring the position and making marks, it can well improve the production efficiency in mass production.

[0009] In the above-mentioned welding tooling for the shell and the anti-retraction guide seat in the traction seat plate, the positioning plug plate has a first positioning plug-in portion, the first positioning plug-in portion is provided with a first positioning socket that can cooperate with the positioning rod, and the two sides of the first positioning plug-in portion respectively have inclined guide surfaces, the inclination directions of the two guide surfaces are opposite and the inclination angles are the same, and the distance between the two guide surfaces gradually decreases along the insertion direction of the positioning plug plate.

[0010] Inclined guide surfaces are provided on both sides of the first positioning inserting portion where the first positioning socket is located, the two guide surfaces are inclined in opposite directions and at the same angle, and the distance between the two guide surfaces gradually decreases along the inserting direction of the positioning inserting plate, so that when the first positioning inserting portion is inserted between the two lugs of the anti-retraction guide seat, the guide surfaces on both sides of the first positioning inserting portion will respectively abut against the side walls opposite to the two lugs, and with the continuous insertion of the positioning inserting plate, the anti-retraction guide seat will be corrected, which can avoid the anti-retraction guide seat from being skewed, and ensure that the anti-retraction guide seat and the shell are in a perpendicular state, thereby ensuring that the anti-retraction guide seat and the shell can meet the use requirements after welding. In other words, the positioning inserting plate has two functions, one is to position the anti-retraction guide seat on the abutting step, and the other is to correct the verticality of the anti-retraction guide seat and the shell.

[0011] In the above-mentioned welding tooling for the shell and the anti-retraction guide seat in the traction seat plate, the positioning plug plate also has a second positioning plug-in portion, the second positioning plug-in portion and the first positioning plug-in portion are located on the same side of the positioning plug plate, the second positioning plug-in portion is provided with a second positioning socket, the second positioning socket is parallel to the first positioning socket, the second positioning socket is strip-shaped, and a yielding recess is formed between the first positioning plug-in portion and the second positioning plug-in portion.

[0012] By arranging a second positioning plug-in portion on the positioning plug-in portion and arranging a second positioning socket in a strip shape on the second positioning plug-in portion, a yielding recess is formed between the first positioning plug-in portion and the second positioning plug-in portion, so that the positioning plug-in plate can be inserted into the matching rod and the rear plate at the same time, specifically, the second positioning socket of the positioning plug-in plate is inserted into the rear plate, and the first positioning socket of the positioning plug-in plate is inserted outside the matching rod, and the yielding recess can make way for one of the lugs of the retreat guide seat.

[0013] Since the rear plate is perpendicular to the housing, the positioning plug plate is also perpendicular to the housing through the cooperation between the second positioning socket and the rear plate. On this basis, combined with the guiding surfaces arranged on both sides of the first positioning insertion part, the perpendicularity between the anti-return guiding seat and the housing during welding can be better ensured.

[0014] In the above-mentioned welding tooling for the housing and the anti-return guiding seat in a towing seat plate, several mounting holes are provided on one side wall of the second positioning socket, and the mounting holes are distributed along the length direction of the second positioning socket. Elastic abutting members are arranged in each mounting hole, and part of the elastic abutting members extends out of the side wall of the second positioning socket where the mounting hole is located.

[0015] After the positioning plug plate is inserted into the rear plate through the second positioning socket, each elastic abutting member will press against the side wall of the rear plate under the action of its own elastic force. With the arrangement of each elastic abutting member, the processing error can be compensated, and the state perpendicular to the housing can be better ensured after the positioning plug plate is inserted into the rear plate. The higher the perpendicularity between the positioning plug plate and the housing, the more the perpendicularity between the anti-return guiding seat and the housing can be ensured. In addition, each elastic abutting member can also form a certain clamping force to ensure that the positioning plug plate can firmly clamp the rear plate and ensure that there is no easy jumping during the welding process.

[0016] In the above-mentioned welding tooling for the housing and the anti-return guiding seat in a towing seat plate, the elastic abutting member includes a steel ball and an abutting spring, and the abutting spring acts on the steel ball to make part of the steel ball extend out of the side wall of the second positioning socket where the mounting hole is located.

[0017] The steel ball can roll freely to avoid scratching the rear plate during the process of inserting into or pulling out from the rear plate.

[0018] In the above-mentioned welding tooling for the housing and the anti-return guiding seat in a towing seat plate, as another technical solution, the elastic abutting member is a ball head plunger.

[0019] In the above-mentioned welding tooling for the housing and the anti-return guiding seat in a towing seat plate, the width of the annular card slot along the axial direction of the positioning rod is slightly larger than the thickness of the limiting plug plate.

[0020] If the width of the annular card slot along the axial direction of the positioning rod is set to exactly match the thickness of the limiting plug plate, then the requirement for the position of the annular card slot during processing is very high, requiring that when the limiting plug plate is inserted into the annular card slot and abuts against the rotating pin frame, the first spring also acts on the positioning rod with an elastic force. However, for the same batch of towing seat plates, there are also processing errors. Therefore, setting the width of the annular card slot along the axial direction of the positioning rod to be slightly larger than the thickness of the limiting plug plate can compensate for the processing error and ensure that it can meet the use requirements in batch welding.

[0021] Compared with the prior art, the welding tooling for the housing and the anti-backlash guide seat in the towing seat plate has the following advantages:

[0022] 1. Through the settings of the positioning rod, the mating rod, the positioning insertion plate and the limit insertion plate, the anti-backlash guide seat can be accurately and firmly positioned at the specified position on the housing before welding. In particular, the positioning rod uses the guiding hole of the rotary pin bracket for positioning, and the anti-backlash guide seat uses the abutting step at the outer end of the positioning rod for positioning. Therefore, it can better ensure the coaxiality between the central hole of the anti-backlash guide seat and the guiding hole of the rotary pin bracket.

[0023] 2. It is very convenient to operate and can greatly improve the production efficiency during mass production. Description of the Drawings

[0024] Figure 1 is a schematic diagram of the welding tooling for the housing and the anti-backlash guide seat in the towing seat plate.

[0025] Figure 2 is an exploded schematic diagram of the welding tooling for the housing and the anti-backlash guide seat in the towing seat plate.

[0026] Figure 3 is a cross-sectional view of the welding tooling for the housing and the anti-backlash guide seat in the towing seat plate.

[0027] Figure 4 is a three-dimensional schematic diagram of the positioning insertion plate.

[0028] Figure 5 is a schematic diagram of the welding tooling for the housing and the anti-backlash guide seat in the towing seat plate when used on the towing seat plate.

[0029] Figure 6 is a cross-sectional view of the welding tooling for the housing and the anti-backlash guide seat in the towing seat plate when used on the towing seat plate (the cross-sectional direction is the same as Figure 3 ).

[0030] Figure 7 is Figure 6 a cross-sectional view taken along the A-A direction in

[0031] Figure 8 is a three-dimensional schematic diagram of the towing seat plate.

[0032] In the figure, 1 is a positioning rod; 1a is an abutting shoulder; 1b is an abutting step; 1c is an annular clamping groove; 2 is a mating rod; 3 is a first positioning spring; 4 is a second positioning spring; 5 is a first annular blocking member; 6 is a second annular blocking member; 7 is a limiting insertion plate; 7a is a limiting insertion socket; 8 is a positioning insertion plate; 8a is a first positioning insertion portion; 8a1 is a first positioning insertion socket; 8a2 is a guiding surface; 8b is a second positioning insertion portion; 8b1 is a second positioning insertion socket; 8b2 is a mounting hole; 8c is a relief notch; 9 is an elastic abutting member; 9a is a steel ball; 9b is an abutting spring; 10 is a housing; 11 is a pivot pin holder; 11a is a guiding hole; 12 is a front plate; 13 is a rear plate; 14 is a non-return guiding seat; 14a is a lug. Detailed implementation manner

[0033] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0034] Embodiment 1

[0035] A welding tool for welding a housing and a non-return guiding seat in a traction seat plate, including a round rod-shaped positioning rod 1. The two ends of the positioning rod 1 are respectively an inner end and an outer end. An abutting shoulder 1a is provided on the outer side of the inner end portion of the positioning rod 1. A first positioning spring 3 is sleeved on the inner end of the positioning rod 1. An abutting step 1b is provided on the outer end portion of the positioning rod 1. An annular clamping groove 1c is provided on the outer side of the middle region of the positioning rod 1 along its length direction. The welding tool further includes a limiting insertion plate 7 that can be inserted at the annular clamping groove 1c. Specifically, the limiting insertion plate 7 has a limiting insertion socket 7a. The width of the annular clamping groove 1c along the axial direction of the positioning rod 1 is slightly larger than the thickness of the limiting insertion plate 7. The welding tool further includes a round rod-shaped mating rod 2. The mating rod 2 axially passes through the positioning rod 1. A first annular blocking member 5 is fixedly connected to the inner end portion of the mating rod 2. A second annular blocking member 6 is fixedly connected to the outer end portion of the mating rod 2. A second positioning spring is sleeved on the mating rod 2 between the first annular blocking member 5 and the abutting shoulder 1a. The welding tool further includes a positioning insertion plate 8 that can be inserted between the outer end portion of the positioning rod 1 and the mating rod 2 outside the second annular blocking member 6. In this embodiment, both the first annular blocking member 5 and the second annular blocking member 6 are annular blocks. The first annular blocking member 5 and the second annular blocking member 6 are respectively fixedly connected to the inner end and the outer end of the mating rod 2 by screws. The outer diameter of the second annular blocking member 6 is smaller than the outer diameter of the positioning rod 1. The size of the abutting step 1b is matched with the size of the central hole of the non-return guiding seat 14, and the aperture of the central hole of the non-return guiding seat 14 is larger than the outer diameter of the second annular blocking member 6.

[0036] Further, the positioning plug-in plate 8 has a first positioning plug-in portion 8a, the first positioning plug-in portion 8a is provided with a first positioning socket 8a1 that can be matched with the positioning rod 1, and the first positioning plug-in portion 8a has inclined guide surfaces 8a2 on both sides, the two guide surfaces 8a2 have the same inclination direction and inclination angle, and the distance between the two guide surfaces 8a2 gradually decreases along the insertion direction of the positioning plug-in plate 8. The first positioning plug-in portion 8a also has parallel connecting surfaces on both sides, the connecting surfaces are connected to the guide surfaces 8a2 on the same side, and the guide surfaces 8a2 and the connecting surfaces are distributed in sequence along the insertion direction of the positioning plug-in plate 8, and the distance between the two connecting surfaces is the same as the minimum distance between the two guide surfaces 8a2. The positioning plug plate 8 also has a second positioning plug-in portion 8b, which is located on the same side of the positioning plug plate 8 as the first positioning plug-in portion 8a. The second positioning plug-in portion 8b is provided with a second positioning socket 8b1, which is parallel to the first positioning socket 8a1. The second positioning socket 8b1 is strip-shaped, and a clearance recess 8c is formed between the first positioning plug-in portion 8a and the second positioning plug-in portion 8b.

[0037] In this embodiment, a plurality of mounting holes 8b2 are provided on one side wall of the second positioning socket 8b1, and each mounting hole 8b2 is distributed along the length direction of the second positioning socket 8b1, and each mounting hole 8b2 is provided with an elastic abutment member 9, and the elastic abutment member 9 partially extends out of a side wall of the second positioning socket 8b1 where the mounting hole 8b2 is located. Specifically, the elastic abutment member 9 includes a steel ball 9a and an abutment spring 9b, and the abutment spring 9b acts on the steel ball 9a so that the steel ball 9a partially extends out of a side wall of the second positioning socket 8b1 where the mounting hole 8b2 is located.

[0038] In use, first fixedly connect a first annular blocking member 5 to the inner end of the mating rod 2 and sleeved a second positioning spring 4 on the inner end of the mating rod 2. Then, pass the mating rod 2 through the positioning rod 1 from the inner end to the outer end and fixedly connect a second annular blocking member 6 to the outer end of the mating rod 2. Next, sleeve a first positioning spring 3 on the inner end of the positioning rod 1. After that, position the housing 10 on the table board, pass the positioning rod 1 through the guiding hole 11a of the rotating pin holder 11 from the inner end to the outer end (the outer diameter of the positioning rod 1 matches the aperture of the guiding hole 11a of the rotating pin holder 11), and insert the limit insertion plate 7 outside the annular slot 1c of the positioning rod 1. In this way, the first positioning spring 3 will abut between one side of the rotating pin holder 11 and the abutting step 1b, and the elastic force of the first positioning spring 3 will act on the positioning rod 1 to make the limit insertion plate 7 abut against the other side of the rotating pin holder 11, so that the positioning rod 1 and the rotating pin holder 11 are axially fixed together. Then, sleeve and abut the anti-retreat guiding seat 14 on the outer end of the positioning rod 1, and then insert the positioning insertion plate 8 outside the mating rod 2 between the outer end of the positioning rod 1 and the second annular blocking member 6. Since the second positioning spring 4 abuts between the first annular blocking member 5 and the abutting shoulder 1a of the positioning rod 1, when the positioning rod 1 and the rotating pin holder 11 are axially fixed together, the elastic force of the second positioning spring 4 will act on the first annular blocking member 5 to make the whole mating rod 2 always tend to move towards the front inner end direction. In this way, the positioning insertion plate 8 will abut against the anti-retreat guiding seat 14 to fix the axial position of the anti-retreat guiding seat 14. Thus, as Figure 5 and Figure 6 shown, the position of the anti-retreat guiding seat 14 on the housing 10 is accurately positioned, and the coaxiality between the central hole of the anti-retreat guiding seat 14 and the guiding hole 11a of the rotating pin holder 11 can be well guaranteed during welding.

[0039] In practice, as Figure 7 shown, the positioning insertion plate 8 is inserted into both the mating rod 2 and the rear plate 13 at the same time. Specifically, the second positioning socket 8b1 of the positioning insertion plate 8 is inserted into the rear plate 13, and the first positioning socket 8a1 of the positioning insertion plate 8 is inserted outside the mating rod 2. Since the rear plate 13 is perpendicular to the housing 10, through the cooperation between the second positioning socket 8b1 and the rear plate 13, the positioning insertion plate 8 is also perpendicular to the housing 10. In this way, when the first positioning insertion portion 8a where the first positioning socket 8a1 is located is inserted between the two lugs 14a of the anti-retreat guiding seat 14, the guiding surfaces 8a2 on both sides of the first positioning insertion portion 8a will respectively abut against the opposite side walls of the two lugs 14a, and form a correcting effect on the anti-retreat guiding seat 14 as the positioning insertion plate 8 is continuously inserted, ensuring that the anti-retreat guiding seat 14 can also be in a state perpendicular to the housing 10.

[0040] Embodiment 2

[0041] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the elastic abutting member 9 is a ball plunger.

[0042] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A welding tooling for a housing and a backstop guide seat in a towing seat plate, including a positioning rod (1) in the shape of a round rod. The two ends of the positioning rod (1) are respectively an inner end and an outer end, and it is characterized in that, The welding tool also includes a round rod-shaped matching rod (2), the matching rod (2) passes through the positioning rod (1) in the axial direction, the outer side of the inner end of the positioning rod (1) is provided with abutting convex shoulder (1a), the inner end of the positioning rod (1) is sleeved with a first positioning spring (3), the outer end of the positioning rod (1) is provided with abutting step (1b), the inner end of the matching rod (2) is fixedly connected with a first annular blocking member (5), the outer end of the matching rod (2) is fixedly connected with a second annular blocking member (6), the matching rod (2) between the first annular blocking member (5) and the abutting convex shoulder (1a) is sleeved with a second positioning spring (4), the positioning rod (1) is provided with an annular groove (1c) on the outer side of the middle area along the length direction thereof, and the welding tool also includes a limit plug plate (7) that can be inserted in the annular groove (1c) and a positioning plug plate (8) outside the matching rod (2) that can be inserted between the outer end of the positioning rod (1) and the second annular blocking member (6).

2. The welding tooling for the housing and the anti-reverse guide seat in the towing seat plate according to claim 1, characterized in that, The positioning plug plate (8) comprises a first positioning plug-in portion (8a), the first positioning plug-in portion (8a) being provided with a first positioning socket (8a1) capable of cooperating with the positioning rod (1), and two sides of the first positioning plug-in portion (8a) respectively comprising inclined guide surfaces (8a2), the two guide surfaces (8a2) being inclined in opposite directions and at the same angle, and the distance between the two guide surfaces (8a2) gradually decreasing along the insertion direction of the positioning plug plate (8).

3. The welding tooling for the housing and the anti-reverse guide seat in the towing seat plate according to claim 2, characterized in that, The positioning plug plate (8) further comprises a second positioning plug portion (8b), the second positioning plug portion (8b) and the first positioning plug portion (8a) are located on the same side of the positioning plug plate (8), the second positioning plug portion (8b) is provided with a second positioning socket (8b1), the second positioning socket (8b1) is parallel to the first positioning socket (8a1), the second positioning socket (8b1) is in a strip shape, and a clearance recess (8c) is formed between the first positioning plug portion (8a) and the second positioning plug portion (8b).

4. The welding tooling for the housing and the anti-reverse guide seat in the towing seat plate according to claim 3, characterized in that, A plurality of mounting holes (8b2) are provided on one side wall of the second positioning socket (8b1), and the mounting holes (8b2) are distributed along the length direction of the second positioning socket (8b1). An elastic abutment member (9) is provided in each mounting hole (8b2), and a portion of the elastic abutment member (9) extends out of a side wall of the second positioning socket (8b1) where the mounting hole (8b2) is located.

5. The welding tooling for the housing and the anti-retreat guide seat in the towing seat plate according to claim 4, characterized in that, The elastic abutment member (9) comprises a steel ball (9a) and an abutment spring (9b), wherein the abutment spring (9b) acts on the steel ball (9a) to cause a portion of the steel ball (9a) to extend out of a side wall of the second positioning socket (8b1) where the mounting hole (8b2) is located.

6. The welding tooling for the housing and the anti-reverse guide seat in the towing seat plate according to claim 4, characterized in that The elastic abutment member (9) is a ball plunger.

7. The welding tooling for the housing and the anti-retreat guide seat in the towing seat plate according to claim 1 or 2 or 3 or 4, characterized in that, The width of the annular groove (1c) along the axial direction of the positioning rod (1) is slightly greater than the thickness of the limiting plug plate (7).

Images