Positioning welding device for water collecting and distributing device production

The automatic gripping and placement of the valve body is achieved through a motor-driven connecting rod and movable rod structure combined with an electric push rod. The all-around clamping mechanism solves the problems of low efficiency and unstable positioning in existing positioning welding devices, thereby improving welding accuracy and product quality consistency.

CN224169052UActive Publication Date: 2026-04-28ZHUJI DUNER VALVE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHUJI DUNER VALVE CO LTD
Filing Date
2025-05-21
Publication Date
2026-04-28

AI Technical Summary

Technical Problem

Existing positioning welding devices require manual feeding, have low automation levels, and lack positioning and clamping stability, resulting in poor welding accuracy and product quality consistency.

Method used

The system employs a motor-driven connecting rod and movable rod structure, along with an electric push rod, to achieve automatic gripping and placement of the valve body. A comprehensive clamping mechanism ensures stable welding, including an electric push rod that drives a trapezoidal block to clamp the clamping block and clamping plate in all directions.

Benefits of technology

The system enables automated and efficient feeding of valve bodies, ensuring precise delivery of valve bodies to the welding position. During the welding process, the square tube remains stable without displacement, improving production efficiency and the consistency of welding quality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the field of positioning welding devices, and discloses a positioning welding device for water collecting and distributing device production, which comprises a welding table, a pressing rod and a welding gun, the left end of the top of the welding table is fixedly connected with a fixed seat, and the top end of the rear side of the fixed seat is fixedly connected with a motor I; the driving end of the first motor penetrates through the fixing base and is rotationally connected with a first connecting rod, the right end of the first connecting rod is rotationally connected with a movable rod, a first limiting groove is formed in the front side of the movable rod and connected with a second limiting groove through a limiting rod, and the second limiting groove is formed in the top end of the front side of the fixing base. And the bottom end of the front side of the movable rod is fixedly connected with a movable block. According to the valve body feeding device, automatic grabbing and placing of the valve body are achieved, manual intervention is reduced, the feeding efficiency is greatly improved, it is guaranteed that the valve body is accurately conveyed to the welding position at the top of the square pipe, and the production process is smoother. And meanwhile, welding positioning is conducted through all-directional clamping, and it is guaranteed that the square pipe is stable and free of displacement during welding.
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Description

Technical Field

[0001] This utility model relates to the field of positioning welding devices, and in particular to a positioning welding device for the production of water manifolds. Background Technology

[0002] Positioning welding equipment used in the production of manifolds is typically used to position and weld relevant components during the manufacturing process. During positioning welding, the orientation of the hexagonal valve bodies needs to be adjusted to ensure that all hexagonal valve bodies face outwards and remain parallel to one side of the square tube.

[0003] However, in actual positioning welding work, the following technical problems were found in the existing positioning welding devices:

[0004] In existing positioning welding devices, workers still need to manually place the valve body into the designated position. This is not only labor-intensive and inefficient, making it difficult to meet the needs of large-scale production, but also makes it difficult to ensure that the valve body is placed accurately every time, which may lead to positional deviations and inaccurate welding positions, affecting the consistency of product quality. At the same time, most existing positioning welding devices may only achieve simple one-sided clamping or fixing, which makes the workpiece prone to displacement due to welding stress and other external forces during the welding process, affecting welding accuracy.

[0005] In response to this technical problem, this application proposes a positioning welding device for the production of water manifolds. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies, such as low automation levels in manual material feeding and insufficient stability in positioning and clamping. This invention proposes a positioning and welding device for manifold production, which automatically grasps and places the valve body, reducing manual intervention, greatly improving feeding efficiency, and ensuring precise delivery of the valve body to the welding position at the top of the square tube, thus streamlining the production process. Simultaneously, it provides omnidirectional clamping for welding positioning, ensuring the square tube remains stable and without displacement during welding.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A positioning welding device for producing a water manifold includes a welding table, a pressure rod, and a welding gun. A fixed base is fixedly connected to the top left end of the welding table. A motor is fixedly connected to the top rear side of the fixed base. The drive end of the motor passes through the fixed base and is rotatably connected to a connecting rod. A movable rod is rotatably connected to the right end of the connecting rod. A limiting groove is formed on the front side of the movable rod. The limiting groove is connected to a second limiting groove via a limiting rod. The second limiting groove is located at the top front side of the fixed base. A movable block is fixedly connected to the bottom front side of the movable rod. An electric push rod is fixedly connected to the bottom left end of the movable block. The movable block has a sliding groove at its bottom right end. Sliding slider 1 and sliding slider 2 are slidably connected from left to right on the inner wall of sliding groove 1. A connecting rod 2 is rotatably connected to the right side of sliding slider 1. The right end of the connecting rod 2 is rotatably connected to the left side of sliding slider 2. A shaft is rotatably connected to the top center of the connecting rod 2. The top of the shaft is fixedly connected to the top side of the inner wall of sliding groove 1. A sliding rod 1 is fixedly connected to the center of the right side of sliding slider 1. The right end of the sliding rod 1 passes through sliding slider 2 and is slidably connected to it. A spring 1 is fixedly connected to the side of sliding slider 1 and sliding slider 2. An inner support block is fixedly connected to the bottom of sliding slider 1 and sliding slider 2.

[0009] Furthermore, the welding table has a second sliding groove on its top, and a base is slidably connected inside the second sliding groove. The bottom left side of the base has teeth, which are connected to the second motor via gears. A square tube is provided on the top of the base. Electric push rods are fixedly connected to the front and rear ends of the top of the base. Trapezoidal blocks are fixedly connected to the adjacent sections of the electric push rods. The adjacent side of the trapezoidal block is connected to a clamping block via a second sliding rod. The adjacent side of the clamping block is in contact with the front and rear sides of the square tube. Clamping plates are rotatably connected to both ends of the clamping block. A second spring is fixedly connected to the adjacent side of the clamping block and the trapezoidal block.

[0010] Furthermore, the second slide rod passes through the front end of the trapezoidal block and is slidably connected to it. The front end of the second slide rod is fixedly connected to the middle of the rear side of the clamping block, and the second spring is installed on the outside of the second slide rod.

[0011] Furthermore, the inner rear end of the clamping plate is in contact with the left and right front ends of the trapezoidal block.

[0012] Furthermore, the second motor is fixedly connected to the left end of the bottom side of the inner wall of the second slide.

[0013] Furthermore, a conveyor belt is provided at the top left end of the welding station, and side baffles are installed on both the front and rear sides of the conveyor belt. A front baffle is fixedly connected to the right end of the front and rear side baffles, and a valve body is provided at the top of the conveyor belt.

[0014] Furthermore, the front end of the second limiting groove is slidably connected to the inside of the first limiting groove, and the rear end of the second limiting groove is slidably connected to the inner wall of the limiting rod.

[0015] Furthermore, the outer wall of the inner support block is adapted to the size of the inner wall at the top of the valve body.

[0016] This utility model has the following beneficial effects:

[0017] In this invention, a motor drives a connecting rod and a movable rod, which in turn controls the tightening and opening of the inner support block, thus achieving automatic gripping and placement of the valve body. This automated feeding process greatly reduces manual intervention, improves feeding efficiency, and can quickly and accurately transport the valve body to the designated welding position on the top of the square tube, making the production process smoother and more efficient.

[0018] In this invention, the welding positioning is more stable. The electric push rod 2 pushes the trapezoidal block, which in turn drives the clamping block and clamping plate to clamp the square tube in all directions. The spring 2 between the clamping block and the trapezoidal block plays a buffering role to prevent excessive clamping force from damaging the square tube. At the same time, it ensures that the square tube is always stably clamped during the entire welding process and will not be displaced due to external force. Attached Figure Description

[0019] Figure 1 This is a perspective view of a positioning welding device for the production of a water distribution device proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the movable rod in a positioning welding device for the production of a water distribution device proposed in this utility model;

[0021] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0023] Figure 5 This is a schematic diagram of the clamping plate in a positioning welding device for the production of a water distribution device proposed in this utility model;

[0024] Figure 6 for Figure 5 Enlarged view of point C in the middle;

[0025] Figure 7 This is a schematic diagram of the gear and teeth in a positioning welding device for the production of a water distribution device proposed in this utility model.

[0026] Legend:

[0027] 1. Welding table; 2. Fixed base; 3. Motor 1; 4. Connecting rod 1; 5. Movable rod; 6. Limiting groove 1; 7. Limiting rod; 8. Limiting groove 2; 9. Movable block; 10. Electric push rod 1; 11. Slide groove 1; 12. Slider 1; 13. Slider 2; 14. Connecting rod 2; 15. Shaft; 16. Slide rod 1; 17. Spring 1; 18. Inner support block; 19. Slide groove 2; 20. Base; 21. Electric push rod 2; 22. Trapezoidal block; 23. Slide rod 2; 24. Clamping block; 25. Spring 2; 26. Clamping plate; 27. Tooth; 28. Gear; 29. ​​Motor 2; 30. Square tube; 31. Conveyor belt; 32. Side baffle; 33. Front baffle; 34. Pressure rod; 35. Welding gun; 36. Valve body. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Reference Figure 1 , Figure 2 and Figure 5 This utility model provides an embodiment of a positioning welding device for the production of a water manifold, comprising a welding table 1, a pressure rod 34, and a welding gun 35. A fixed base 2 is fixedly connected to the top left end of the welding table 1. A motor 3 is fixedly connected to the top rear side of the fixed base 2. The drive end of the motor 3 passes through the fixed base 2 and is rotatably connected to a connecting rod 4. A movable rod 5 is rotatably connected to the right end of the connecting rod 4. A limiting groove 6 is formed on the front side of the movable rod 5. The limiting groove 6 is connected to a limiting groove 8 via a limiting rod 7. The limiting groove 8 is formed on the top front side of the fixed base 2. A movable block 9 is fixedly connected to the bottom front side of the movable rod 5. An electric push rod 10 is fixedly connected to the bottom left end of the movable block 9. A sliding groove 11 is provided at the bottom right end of block 9. Sliding slider 12 and sliding slider 2 13 are slidably connected from left to right on the inner wall of sliding groove 11. A connecting rod 2 14 is rotatably connected to the right side of sliding slider 12. The right end of connecting rod 2 14 is rotatably connected to the left side of sliding slider 2 13. A shaft 15 is rotatably connected to the top center of the top of connecting rod 2 14. The top of shaft 15 is fixedly connected to the top side of the inner wall of sliding groove 11. A sliding rod 16 is fixedly connected to the right center of sliding slider 12. The right end of sliding rod 16 passes through sliding slider 2 13 and is slidably connected to it. A spring 17 is fixedly connected to the side of sliding slider 12 and sliding slider 2 13. An inner support block 18 is fixedly connected to the bottom of sliding slider 12 and sliding slider 2 13.

[0030] Specifically, after motor 3 starts, its drive end begins to rotate, which in turn drives the connecting rod 4, which passes through and is rotatably connected to it, to perform a circular motion. The right end of the connecting rod 4 is rotatably connected to the movable rod 5. When the connecting rod 4 rotates, the movable rod 5 will move left and right around the connection point with the connecting rod 4 as an axis. An important limiting groove 6 is provided on the front side of the movable rod 5. The limiting groove 6 is tightly connected to the limiting groove 8, which is opened at the top front side of the fixed base 2, through the limiting rod 7. This structure allows the swing range of the movable rod 5 to be precisely limited during the movement. The limiting rod 7 slides in the limiting groove 6 and the limiting groove 8 to prevent the movable rod 5 from swinging excessively, ensuring the stability and repeatability of its movement trajectory, and laying a solid foundation for subsequent precise operation.

[0031] The electric push rod 10 connected to the bottom left end of the movable block 9 plays a crucial role in the entire feeding process. The main function of the electric push rod 10 is to push the slider 12, causing it to move towards the slider 13. When the electric push rod 10 is activated and extended, its thrust is transmitted to the slider 12. Since the right side of the slider 12 is rotatably connected to the connecting rod 14, and the right end of the connecting rod 14 is rotatably connected to the left side of the slider 13, and the top center of the connecting rod 14 is rotatably connected to the shaft 15 (the top of the shaft 15 is fixed to the top side of the inner wall of the slide groove 11), the movement of the slider 12 will cause the connecting rod 14 to rotate around the shaft 15, thereby causing the slider 13 to slide relatively close to the slider 12 in the slide groove 11. During this process, the inner support block 18, which is fixedly connected to the bottom of both the slider 12 and the slider 13, will gradually move closer to each other as the slider moves, realizing the tightening action of the inner support block. When motor 3 drives the movable rod 5 to move, causing the movable block 9 to move directly above the valve body 36 placed on top of the conveyor belt 31, the inner support block 18, which is in a tightened state, can smoothly enter the round hole at the top of the valve body 36. Subsequently, the electric push rod 10 retracts. As the electric push rod 10 retracts, the slider 12 moves in the opposite direction under its drive. With the cooperation of the connecting rod 14, shaft 15, and other structures, the slider 13 also slides away from the slider 12. This reverse movement causes the inner support block 18 to open towards the inner wall at the top of the valve body 36, achieving stable inner support of the inner support block against the inner wall at the top of the valve body 36. Because the inner support block 18 is tightly fitted to the inner wall at the top of the valve body 36, and the movement trajectory of the movable rod 5 is precisely controlled by the limiting groove 6, the limiting groove 8, and the limiting rod 7, it can be ensured that the valve body 36 remains stable when the movable rod 5 moves to feed materials, without shaking or shifting.

[0032] Compared to the traditional manual placement and welding process of valve body 36, this automatic feeding structure greatly improves production efficiency. Manual placement of valve body 36 is not only slow, but also prone to problems such as inaccurate placement and inconsistent orientation due to human factors. However, this structure, through the precise control of motor 3, the accurate guidance of the limiting structure, and the internal support and stable clamping achieved by electric push rod 10 and other components, can quickly and accurately place valve body 36 on top of square tube 30, effectively ensuring that valve body 36 faces outward in a consistent direction and is parallel to one side of square tube 30, significantly improving the quality and stability of the positioning and welding process in the production of water manifolds.

[0033] Reference Figure 1 , Figure 5 and Figure 7 The welding table 1 has a sliding groove 19 on its top, and a base 20 is slidably connected inside the sliding groove 19. A tooth 27 is provided on the bottom left side of the base 20, and the tooth 27 is connected to a motor 29 via a gear 28. A square tube 30 is provided on the top of the base 20. Electric push rods 21 are fixedly connected to the front and rear ends of the top of the base 20. A trapezoidal block 22 is fixedly connected to one end of each electric push rod 21. A side of the trapezoidal block 22 is connected to a clamping block 24 via a sliding rod 23. The side of the clamping block 24 is in contact with the front and rear sides of the square tube 30. Clamping plates 26 are rotatably connected to both ends of the clamping block 24. A spring 25 is fixedly connected to the side of the clamping block 24 near the trapezoidal block 22. The sliding rod 23 passes through the trapezoidal block 22. The front end is slidably connected to it. The front end of the slide rod 23 is fixedly connected to the middle of the rear side of the clamping block 24. The spring 25 is installed on the outside of the slide rod 23. The inner side of the rear end of the clamping plate 26 is in contact with the left and right sides of the front end of the trapezoidal block 22. The motor 29 is fixedly connected to the left end of the bottom side of the inner wall of the slide groove 29. The top left end of the welding table 1 is provided with a conveyor belt 31. The front and rear sides of the conveyor belt 31 are both equipped with side baffles 32. The right end of the front and rear side baffles 32 is fixedly connected to the front baffle 33. The top of the conveyor belt 31 is provided with a valve body 36. The front end of the limiting groove 28 is slidably connected to the inside of the limiting groove 16. The rear end of the limiting groove 28 is slidably connected to the inner wall of the limiting rod 7. The outer wall of the inner support block 18 is adapted to the size of the top inner wall of the valve body 36.

[0034] Specifically, the square tube 30 at the top of the base 20 is a key component to be welded. An electric push rod 21, fixedly connected to the front and rear ends of the top of the base 20, extends during operation, pushing the trapezoidal block 22, which is fixedly connected to it, to move towards each other. The special shape of the trapezoidal block 22 allows it to move towards the square tube 30 via a sliding rod 23, clamping its front and rear sides. The sliding rod 23 passes through the front end of the trapezoidal block 22 and slides therewith, ensuring the stability of the clamping block 24's movement. The front end of the clamping block 24 fits firmly against the front and rear sides of the square tube 30, preventing displacement due to external forces during welding. The clamping plates 26, rotatably connected to the left and right ends of the clamping block 24, move towards each other when the trapezoidal block 22 is pushed by the electric push rod 21. The left and right sides gradually press the inner rear end of the clamping plate 26, so that the rear end of the clamping plate 26 is subjected to a gradually outward force. Since the clamping plate 26 and the clamping block 24 are rotatably connected, under this external force, the front end of the clamping plate 26 gradually clamps inward. Together with the clamping block 24 clamping the square tube 30 from the front and rear sides, the square tube 30 is stably clamped from all directions. This design can effectively meet the fixing requirements of square tubes 30 of different specifications and improve the versatility of the device. The spring 25, which is fixedly connected to the side of the clamping block 24 and the trapezoidal block 22, is installed on the outside of the slide rod 23. It has a buffering effect. When the clamping block 24 clamps the square tube 30, the spring 25 can absorb part of the impact caused by the clamping force, avoid the clamping block 24 from damaging the surface of the square tube 30, and ensure that the square tube 30 is stably clamped throughout the entire welding process.

[0035] The conveyor belt 31, located at the top left end of the welding table 1, with side baffles 32 installed on its front and rear sides and a front baffle 33 fixedly connected to its right end, effectively prevents the valve body 36 from shifting or falling during conveying, ensuring that the valve body 36 is accurately conveyed to the designated position. This facilitates the subsequent automatic feeding structure to grasp and place the valve body 36, improving the continuity and automation of the production process. After the movable rod 5 accurately places the valve body 36 on the top of the square tube 30, the pressure rod 34 and welding gun 35 installed on the top of the positioning structure begin to work. The pressure rod 34 and welding gun 35 are connected by... Simultaneously, the connecting air pressure rod 34 is pushed downwards, and the pressure rod 34 quickly presses against the top of the valve body 36. The stable pressure prevents the valve body 36 from shifting during subsequent welding, providing a stable working foundation for welding. At the same time, the welding gun 35 rotates around the pressure plate via a motor and a rotating mechanism. Utilizing its rotatable characteristic, it performs all-around welding at the connection between the valve body 36 and the square tube 30, ensuring the integrity and firmness of the weld. This, in turn, ensures the efficient and precise operation of the entire positioning welding device used in the production of the manifold, improving the quality and efficiency of manifold production.

[0036] Working principle: During operation, motor 3 starts and drives connecting rod 4 to perform circular motion, causing movable rod 5 to move left and right around the connection point with connecting rod 4. Its swing range is limited by limiting groove 6, limiting groove 8, and limiting rod 7. Movable block 9 moves with movable rod 5. Electric push rod 10 pushes slider 12 to tighten inner support block 18. After moving to directly above valve body 36, inner support block 18 enters the top circular hole of valve body 36. Electric push rod 10 retracts, causing inner support block 18 to open and support valve body 36, accurately placing valve body 36 on top of square tube 30. At the same time, motor 29 drives base 20 in the sliding groove. The position of the square tube 30 is adjusted by sliding within the second 19. The electric push rod 21 pushes the trapezoidal block 22, which drives the clamping block 24 to clamp the square tube 30 through the slide rod 23. The clamping plate 26, under the pressure of the trapezoidal block 22, works with the clamping block 24 to clamp the square tube 30 in all directions. The conveyor belt 31, with the assistance of the side baffle 32 and the front baffle 33, transports the valve body 36 to the designated position. Finally, the pressure rod 34 and the welding gun 35 are pushed downward simultaneously by the pneumatic rod 34. The pressure rod 34 presses down on the valve body 36 to prevent displacement. The welding gun 35 rotates around the pressure plate through a motor and a rotating mechanism to perform all-round welding at the connection between the valve body 36 and the square tube 30.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A positioning welding device for the production of water manifolds, characterized in that, The assembly includes a welding table (1), a pressure rod (34), and a welding gun (35). A fixed base (2) is fixedly connected to the top left end of the welding table (1). A motor (3) is fixedly connected to the top rear side of the fixed base (2). The drive end of the motor (3) passes through the fixed base (2) and is rotatably connected to a connecting rod (4). A movable rod (5) is rotatably connected to the right end of the connecting rod (4). A limiting groove (6) is opened on the front side of the movable rod (5). The limiting groove (6) is connected to a limiting groove (8) through a limiting rod (7). The limiting groove (8) is opened at the top front side of the fixed base (2). A movable block (9) is fixedly connected to the bottom front side of the movable rod (5). An electric push rod (10) is fixedly connected to the bottom left end of the movable block (9). A sliding groove is opened at the bottom right end of the movable block (9). (11) The inner wall of the first slide (11) is slidably connected to the first slider (12) and the second slider (13) from left to right. The right side of the first slider (12) is rotatably connected to the second connecting rod (14). The right end of the second connecting rod (14) is rotatably connected to the left side of the second slider (13). The top center of the second connecting rod (14) is rotatably connected to the shaft (15). The top of the shaft (15) is fixedly connected to the top side of the inner wall of the first slide (11). The center of the right side of the first slider (12) is fixedly connected to the first sliding rod (16). The right end of the first sliding rod (16) passes through the second slider (13) and is slidably connected to it. The sides of the first slider (12) and the second slider (13) are both fixedly connected to the first spring (17). The bottom of the first slider (12) and the second slider (13) are both fixedly connected to the inner support block (18).

2. The positioning welding device for producing a water manifold according to claim 1, characterized in that: The welding table (1) has a sliding groove (19) on its top. A base (20) is slidably connected inside the sliding groove (19). A tooth (27) is provided on the bottom left side of the base (20). The tooth (27) is connected to the motor (29) via a gear (28). A square tube (30) is provided on the top of the base (20). Electric push rods (21) are fixedly connected to the front and rear ends of the top of the base (20). A trapezoidal block (22) is fixedly connected to one end of the electric push rod (21). A clamping block (24) is connected to one side of the trapezoidal block (22) via a sliding rod (23). The clamping block (24) is in contact with the front and rear sides of the square tube (30) on one side. A clamping plate (26) is rotatably connected to both ends of the clamping block (24). A spring (25) is fixedly connected to the side of the clamping block (24) and the trapezoidal block (22).

3. The positioning welding device for producing a water manifold according to claim 2, characterized in that: The second slide rod (23) passes through the front end of the trapezoidal block (22) and is slidably connected to it. The front end of the second slide rod (23) is fixedly connected to the middle of the rear side of the clamping block (24). The second spring (25) is installed on the outside of the second slide rod (23).

4. The positioning welding device for producing a water manifold according to claim 2, characterized in that: The inner rear end of the clamping plate (26) is in contact with the left and right front ends of the trapezoidal block (22).

5. A positioning welding device for producing a water manifold according to claim 2, characterized in that: The second motor (29) is fixedly connected to the left end of the bottom side of the inner wall of the second slide (19).

6. The positioning welding device for producing a water manifold according to claim 1, characterized in that: The welding station (1) is provided with a conveyor belt (31) at the top left end. Side baffles (32) are installed on both the front and rear sides of the conveyor belt (31). A front baffle (33) is fixedly connected to the right end of the side baffles (32) on the front and rear sides. A valve body (36) is provided on the top of the conveyor belt (31).

7. The positioning welding device for producing a water manifold according to claim 1, characterized in that: The front end of the second limiting groove (8) is slidably connected to the inside of the first limiting groove (6), and the rear end of the second limiting groove (8) is slidably connected to the inner wall of the limiting rod (7).

8. A positioning welding device for producing a water manifold according to claim 1, characterized in that: The outer wall of the inner support block (18) is adapted to the size of the inner wall at the top of the valve body (36).