Articulated arm welding fixture

Abstract

The utility model belongs to welding frock technical field, specifically discloses a joint arm welding frock, including base and setting positioning pin, lateral support block, middle part positioning column, support plate and limit block on the base, positioning pin sets up one end at the base for limiting the displacement of joint arm's end connector, lateral support block is located one side at positioning pin for supporting joint arm's end pipe body, middle part positioning column sets up in the base middle part, and the cooperation with joint arm's middle part branch structure is positioned for joint arm middle part area, support plate is fixed in the side close to middle part positioning column, for supporting joint arm's front end pipe body, limit block sets up one side at the base far from positioning pin end, for carrying out the location to joint arm's front end connector, the utility model integrates positioning pin, lateral support block, middle part positioning column, support plate and limit block on the base, and the same base can cover joint arm welding whole process, need not extra purchase special frock of turning over, greatly reduce equipment cost and space occupation.

Description

Technical Field

[0001] This utility model belongs to the field of welding tooling technology, and specifically relates to a welding tooling for articulated arms. Background Technology

[0002] like Figure 1 As shown, this is a heavy-duty truck articulated arm, which consists of an end connector 9, an end tube 10, a middle branch structure 11, a front tube 12, and a front connector 13. All components are welded together. The end connector 9 and the front connector 13 serve as connection nodes with the steering transmission mechanism and the steering knuckle, respectively. The end tube 10 and the front tube 12 are responsible for load transmission. The middle branch structure 11 is the core of multi-directional force convergence. As a whole, it is a key transmission component of the heavy-duty truck steering system, responsible for transmitting steering force to achieve vehicle steering, and bearing vertical loads and lateral impact loads during driving, directly affecting the vehicle's handling accuracy and driving safety.

[0003] Because the articulated arm needs to be welded on both sides to ensure weld strength and connection reliability, traditional tooling is mostly designed for single-sided adaptation. After the first side is welded, a special flipping tooling or repositioning is required, which has poor versatility and high cost. At the same time, there is a lack of limiting and positioning components that can accurately match key parts such as the front connector and the middle support structure. After flipping, parts are prone to displacement and misalignment, resulting in weld accuracy exceeding the standard. Moreover, most tooling components are fixed structures, requiring a lot of disassembly and assembly when flipping, which is cumbersome and inefficient. Utility Model Content

[0004] The purpose of this invention is to overcome the defects in the existing technology and provide a welding fixture for articulated arms.

[0005] This utility model provides a welding fixture for articulated arms, including a base and a positioning pin, a lateral support block, a central positioning column, a support plate, and a limiting block disposed on the base; The positioning pin is disposed at one end of the base and is used to limit the displacement of the end connector of the articulated arm; The lateral support block is located on one side of the positioning pin and is used to support the end tube of the articulated arm; The central positioning post is located in the middle of the base and cooperates with the central branch structure of the joint arm for positioning the central region of the joint arm. The support plate is fixed to one side near the central positioning post and is used to support the front end tube of the articulated arm. The limiting block is located on the side of the base away from the end of the end positioning pin, and is used to limit the front end connector of the articulated arm.

[0006] A further embodiment is that the support plate includes a first support plate and a second support plate; the first support plate is located on the side near the central positioning post, and the second support plate is arranged in a mirror image of the first support plate for supporting the other welding surface of the articulated arm.

[0007] A further embodiment is that the limiting block includes a first limiting block and a second limiting block; the first limiting block is located on the side away from the end of the positioning pin, and the second limiting block is arranged in a mirror image of the first limiting block for limiting the other welding surface of the articulated arm.

[0008] A further option is to make the upper surfaces of the first support plate and the second support plate flush.

[0009] A further embodiment is that the axis of the positioning pin is perpendicular to the upper surface of the base.

[0010] A further embodiment is that the central axis of the central positioning post is parallel to the central axis of the positioning pin.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model integrates positioning pins, lateral support blocks, central positioning columns, support plates, and limiting blocks on a base. The same base can cover the entire welding process of the articulated arm, eliminating the need to purchase additional special flipping tooling, thus significantly reducing equipment costs and space occupation. With all components fixed on the same base and a unified positioning reference, it can accurately control the spatial position errors of the end connector and the central support structure, avoiding reference deviations caused by switching between multiple toolings, and fundamentally reducing quality problems such as weld misalignment and coaxiality deviation.

[0012] The support plates of this utility model are a first support plate and a second support plate arranged in a mirror image, and the limiting blocks are a first limiting block and a second limiting block arranged in a mirror image. It can adapt to the welding requirements of both sides of the articulated arm. When welding on the front side, the first support plate supports the front tube body and the first limiting block limits the front connector. After flipping, there is no need to disassemble the components. The reverse positioning can be achieved directly through the second support plate and the second limiting block. The operation process is simplified. Moreover, the mirror structure is precisely matched with the contour of the articulated arm after flipping, which can avoid the displacement of parts after flipping, ensure the consistency of the weld position on both sides, and reduce the rework rate.

[0013] The first and second support plates of this utility model are flush with each other, ensuring that the front tube body is subjected to balanced force during welding on both sides. This allows for precise control of the tube body's straightness error, ensuring that the assembly dimensions of the front tube body, the middle branch structure, and the front connector meet the design requirements after welding, and improving the overall structural precision of the articulated arm.

[0014] The vertical arrangement of the positioning pins in this invention ensures precise matching between the mounting holes of the end connector and the positioning pins, preventing the end connector from tilting, ensuring the subsequent assembly accuracy with the steering transmission mechanism, and preventing the steering force transmission from being misaligned. The central positioning post is parallel to the axis of the positioning pin, which can ensure that the force direction of the central branch structure is consistent with the transmission direction of the end connector, avoiding local stress concentration and improving the load-bearing capacity of the articulated arm under heavy-load conditions of heavy trucks. Attached Figure Description

[0015] The following figures are for illustrative purposes only and are not intended to limit the scope of the present invention. Figure 1 Schematic diagram of a heavy-duty truck articulated boom structure; Figure 2 Schematic diagram of welding fixture structure; Figure 3 : Schematic diagram of the welding status of the articulated arm; In the diagram: 1. Base; 2. Positioning pin; 3. Lateral support block; 4. Central positioning column; 5. First support plate; 6. First limiting block; 7. Second support plate; 8. Second limiting block; 9. End connector; 10. End tube; 11. Central branch structure; 12. Front tube; 13. Front connector. Detailed Implementation

[0016] To make the objectives, technical solutions, design methods, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this utility model.

[0017] like Figure 1 and Figure 2 As shown, this utility model provides a welding fixture for an articulated arm, including a base 1 and a positioning pin 2, a lateral support block 3, a central positioning post 4, a support plate, and a limiting block disposed on the base. The positioning pin 2 is fixed to a pre-set mounting hole at one end of the base 1 by a threaded connection or interference fit; the lateral support block 3 is fixed to the side of the positioning pin 2 by welding, and its supporting surface is adapted to the outer contour of the end tube 10; the central positioning post 4 adopts the same positioning reference and is welded to a pre-set position in the middle of the base 1; the support plate is fixed to the side near the central positioning post 4 by bolts, and its supporting surface is in contact with the front tube 12; the limiting block is fixed to the end of the base 1 away from the positioning pin 2 by bolts, and its limiting surface matches the outer contour of the front connector 13. In this embodiment, The support plate includes a first support plate 5 and a second support plate 7. Using the axis of the central positioning column 4 as a symmetrical reference, the first support plate 5 is fixed to a base on one side of the central positioning column 4. The second support plate 7 is fixed to the base 1 according to the symmetrical position of the first support plate 5. During installation, the assembly reference line on the base is used to ensure that the line connecting the center points of the two supports is perpendicular to the axis of the central positioning column 4, and that their upper surfaces are flush. The mirror arrangement allows the first support plate 5 and the second support plate 7 to adapt to the welding requirements of both sides of the articulated arm. After flipping, there is no need to disassemble or replace components; only the posture of the articulated arm needs to be switched to achieve support of the front tube 12, simplifying the operation process. Using the center line of the length direction of the base 1 as a symmetrical reference, the first limiting block 6 is fixed to the side of the base away from the end of the positioning pin 2. The second limiting block 8 is fixed to the other side of the base end according to the symmetrical dimensions of the first limiting block 6. After installation, a measuring tool is used to ensure that the distance between the limiting surfaces of both supports and the center line of the base is equal, and that the contour of the limiting surfaces fits the outer contour of the front connector 13 after flipping. The mirror structure is precisely matched with the front connector 13 after the articulated arm is flipped. After flipping, there is no need to readjust the limit position, which solves the problem of disassembling and assembling the limit component after the traditional tooling is flipped. The symmetrical layout ensures that the limit reference on both sides is consistent, avoids the front connector 13 from shifting after flipping, and ensures the position accuracy of the butt weld between the front tube body 12 and the front connector 13.

[0018] In this embodiment, the central axis of the middle positioning post 4 is parallel to the central axis of the positioning pin 2, which allows the force direction of the middle branch structure 11 and the end connector 9 to be coordinated, avoiding torsional stress after welding of the middle branch structure 11 due to axis deviation; under the heavy load of heavy trucks, the coordinated force direction can disperse vertical load and lateral impact load, reduce the risk of fracture of the middle branch structure 11, and improve the overall load-bearing capacity of the articulated arm.

[0019] like Figure 3 As shown, during the welding of the articulated arm, the end connector 9 is first fitted onto the positioning pin 2 at one end of the base 1, the end tube 10 is aligned with the lateral support block 3, the middle branch structure 11 is aligned with the middle positioning post 4, the front tube 12 is placed on the first support plate 5, and the front connector 13 is limited by the first limiting block 6. The first side is then welded. After the weld has initially cooled, the articulated arm is flipped using external equipment. The front tube 12 naturally falls onto the second support plate 7, which is mirrored and flush with the first support plate 5. The front connector 13 is limited by the mirrored second limiting block 8, and the remaining parts are still positioned by the positioning pin 2, the lateral support block 3, and the middle positioning post 4. The second side is then welded, ensuring that the second support plate 7 and the second limiting block 8 do not shift. After welding and cooling to room temperature, the articulated arm is removed, and the welding is complete.

[0020] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A welding fixture for an articulated arm, characterized in that, It includes a base (1) and a positioning pin (2), a lateral support block (3), a central positioning column (4), a support plate, and a limiting block disposed on the base (1); The positioning pin (2) is disposed at one end of the base (1) to limit the displacement of the end connector (9) of the articulated arm; The lateral support block (3) is located on one side of the positioning pin (2) and is used to support the end tube (10) of the articulated arm. The central positioning column (4) is located in the middle of the base (1) and cooperates with the central branch structure (11) of the articulated arm for positioning the central region of the articulated arm. The support plate is fixed to one side near the central positioning column (4) and is used to support the front end tube (12) of the articulated arm. The limiting block is located on the side of the base (1) away from the end of the positioning pin (2) and is used to limit the front end connector (13) of the articulated arm.

2. The articulated arm welding fixture according to claim 1, characterized in that, The support plate includes a first support plate (5) and a second support plate (7); the first support plate (5) is located on the side close to the central positioning column (4), and the second support plate (7) is arranged in a mirror image of the first support plate (5) for supporting the other welding surface of the articulated arm.

3. The articulated arm welding fixture according to claim 2, characterized in that, The limiting block includes a first limiting block (6) and a second limiting block (8); the first limiting block (6) is located on the side of the base (1) away from the end of the positioning pin (2), and the second limiting block (8) is arranged in a mirror image of the first limiting block (6) for limiting the other welding surface of the articulated arm.

4. The articulated arm welding fixture according to claim 3, characterized in that, The upper surfaces of the first support plate (5) and the second support plate (7) are flush.

5. The articulated arm welding fixture according to claim 4, characterized in that, The axis of the positioning pin (2) is perpendicular to the upper surface of the base (1).

6. The articulated arm welding fixture according to claim 5, characterized in that, The central axis of the central positioning post (4) is parallel to the central axis of the positioning pin (2).

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