Welding tool for valve body machining

Abstract

The invention discloses a welding tool for valve body machining, and belongs to the technical field of welding machining. Comprising a stand, an inclined positioning unit and two horizontal positioning units, the inclined positioning unit and the two horizontal positioning units are each provided with a base plate and a positioning and clamping assembly, and each positioning and clamping assembly comprises a rotating base, a positioning end plate and a plurality of pressing arms arranged in the circumferential direction; the middle of the pressing arm is rotationally connected with the positioning end plate, one end is provided with a clamping part, and the other end is driven by a driving mechanism to realize clamping or loosening; the clamping part is provided with a cooling air opening facing a welding seam, and the rotating seat is driven by a rotating driving mechanism so that the positioning end plate and the pressing arm can rotate synchronously. The welding dead zone is eliminated by controlling the positioning and clamping assembly to rotate, 360-degree continuous welding is achieved, weld solidification is accelerated through the follow-up cooling tuyere, the defect of molten pool flowing caused by gravity is effectively restrained, and the welding quality and efficiency are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of welding processing technology, and in particular to a welding fixture for processing valve bodies. Background Technology

[0002] In the valve manufacturing industry, the welding quality of complex valve bodies such as Y-type valves and three-way angle valves, which have multiple ports with different inclination directions, directly affects product performance and service life. Currently, the welding tooling for such valve bodies mainly faces the following problems: First, because the valve body ports have varying inclination directions, the welding torch needs to rotate continuously 360° around the port circumferential seam. However, existing tooling fixtures, after clamping the valve body, often create dead zones in the welding torch's rotation path, causing physical interference between the torch and the fixture. Therefore, in actual production, only partial angle welding can be completed, and the remaining arc segments must be welded in sections. This not only leads to low welding efficiency but also easily results in defects such as incomplete fusion and porosity.

[0003] Secondly, when performing circumferential welding in an inclined position, the molten pool metal is continuously affected by the gravitational component, causing it to flow towards the lower side of the weld, disrupting the balance of the surface tension of the molten pool. This makes it very easy for undercut to form on the upper side of the weld and weld beads or incomplete fusion on the lower side, affecting the weld formation quality and mechanical properties.

[0004] Existing tooling generally only focuses on the reliability of clamping, while ignoring the dynamic interference of the welding process and the influence of gravity on the behavior of the molten pool. Summary of the Invention

[0005] The purpose of this invention is to solve the problems mentioned in the background art by providing a welding fixture for valve body processing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A welding fixture for valve body processing includes a stand, an inclined positioning unit, and two horizontal positioning units, wherein each of the inclined positioning unit and the horizontal positioning unit includes: substrate; A positioning and clamping assembly is mounted on the base plate to fix the corresponding port of the valve body and the flange connected to that port; The positioning and clamping assembly includes: a rotary base, a positioning end plate, and multiple clamping arms; The rotating base is rotatably mounted on the base plate; The positioning end plate is fixedly installed on the rotary seat; Multiple clamping arms are arranged circumferentially along the positioning end plate. The middle part of each clamping arm is rotatably connected to the positioning end plate. One end of each arm is provided with a clamping part, and the other end is connected to a driving mechanism. The drive mechanism is used to drive the clamping part to clamp or release the valve body port and flange; The clamping part is also provided with a cooling air vent facing the weld seam where the valve body port and the flange are connected; The rotating seat is driven to rotate by a rotary drive mechanism, thereby causing the positioning end plate and the clamping arm to rotate synchronously, so that the welding area is gradually exposed to achieve continuous circumferential welding, and the welded area is cooled synchronously through the cooling air vent.

[0007] As a further aspect of the present invention: the clamping part is provided with a first limiting ball, a second limiting ball and a third limiting ball, which are respectively used to abut against the outer wall of the valve body port, the outer wall of the flange and the end face of the flange facing the valve body. The positioning end plate is fitted with multiple end face balls in the contact portion with the valve body, and the multiple end face balls are evenly distributed circumferentially on the positioning end plate.

[0008] As a further embodiment of the present invention: the driving mechanism is located inside the rotary seat and includes a connecting rod, a pull block, a screw, and a spring; A guide groove is provided in the middle of the clamping arm, and a guide rod is provided in the guide groove. The guide rod is rotatably connected to the positioning end plate. The end of the clamping arm away from the clamping part is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is fitted to the pull block. The lower part of the pull block is fixedly connected to the upper end of the screw. The screw passes through the rotary seat and the base plate, and its lower end is threadedly connected to the adjustment handle. A spring is fitted on the screw, with the upper end of the spring abutting against the pull block and the lower end abutting against the inner wall of the rotating seat. Rotating the adjusting handle drives the screw to move axially, and through the pull block and connecting rod, drives the clamping arm to rotate around the guide rod, thereby clamping or loosening the valve body port and flange.

[0009] As a further embodiment of the present invention: the tilting positioning unit is rotatably mounted on the frame and has an angle locking structure; Two horizontal positioning units are symmetrically arranged on both sides of the frame. The bottom of each horizontal positioning unit slides with the frame and has a position locking structure.

[0010] As a further embodiment of the present invention: the tilting positioning unit includes a base plate, and sliding guide rails are provided on both sides of the base plate, with locking nuts installed inside the sliding guide rails; The platform is fixed with connecting blocks on both sides of the tilt positioning unit. Locking bolts are installed on the connecting blocks. The locking bolts cooperate with the locking nuts in the slide rail to lock and adjust and lock the tilt angle and working position of the tilt positioning unit.

[0011] As a further aspect of the present invention, the bottom of the base plate of the horizontal positioning unit is provided with an electric slide rail or a manual slide rail to achieve sliding installation and locking with the frame.

[0012] As a further aspect of the present invention: the rotary drive mechanism includes a drive motor and a gear set, wherein the drive motor is connected to the rotary table via the gear set; When welding the current port, only the rotating seat corresponding to that port is rotating, while the other rotating seats remain stationary to ensure the overall stability of the valve body during the welding process.

[0013] As a further aspect of the present invention: the cooling vent is connected to an external cooling gas source, the cooling gas being compressed air or an inert protective gas, which provides real-time air cooling to the welded area during the rotation of the clamping arm, accelerating weld solidification and inhibiting molten pool flow.

[0014] As a further aspect of the present invention: multiple clamping arms are evenly arranged around the circumference of the positioning end plate to form a circumferential multi-point clamping structure, ensuring that the valve body port and the flange are coaxially positioned and subjected to uniform force.

[0015] As a further aspect of the present invention, it also includes an intelligent control module, which is electrically connected to the rotary drive mechanism, the drive mechanism, and the cooling vent. The intelligent control module has a built-in welding parameter preset unit, which can preset the rotation speed of the rotary table, the gas jet flow rate and jet angle of the cooling vent according to the valve body material and flange specifications. It can also collect the temperature signal of the welding area in real time and automatically adjust the rotation speed of the rotary table and the cooling gas flow rate.

[0016] Compared with existing technologies, the advantages of this invention are: 1. During the welding process, the rotating seat drives the positioning end plate and all the clamping arms to rotate synchronously as a whole, so that the weld area originally covered by the clamping arms is gradually exposed during the rotation. The welding torch can complete 360° non-interference welding along the circumferential seam, fundamentally avoiding physical interference between the welding torch and the tooling, completely eliminating the welding dead zone, replacing the traditional segmented welding, and significantly improving welding efficiency and weld continuity.

[0017] 2. A cooling vent is integrated into the clamping part of the clamping arm. This vent rotates synchronously with the clamping arm and is always aimed at the weld area behind the welding torch that has just solidified or is solidifying. This accelerates the solidification speed of the weld metal and significantly shortens the time that the molten pool is in a liquid state. This effectively counteracts the pulling effect of gravity on the molten pool, reduces defects such as undercut and weld beads, and improves the weld formation quality and valve body sealing performance.

[0018] 3. The multi-point ball bearing limiting structure can simultaneously perform composite positioning and clamping on the outer wall of the valve body port, the outer wall of the flange, and the flange end face. The clamping force is uniform and the positioning accuracy is high. It can effectively prevent the valve body from moving during welding, ensure the coaxiality of the weld and the accuracy of the welding dimensions, and at the same time ensure the smooth rotation of the clamping arm.

[0019] 4. The tilt positioning unit can achieve dual adjustment of angle and position, and the horizontal positioning unit can achieve adaptive adjustment of spacing. It can not only adapt to multi-port valve bodies of different specifications and tilt angles (such as Y-type valves, angled three-way valves, etc.), but also facilitate the installation and disassembly of valve bodies. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view structural diagram of the present invention; Figure 3 This is a schematic diagram of the installation structure of the tilting positioning unit of the present invention; Figure 4 This is a schematic diagram of the installation structure of the horizontal positioning unit of the present invention; Figure 5 This is a schematic diagram of the installation structure of the positioning and clamping assembly of the present invention; Figure 6 This is a schematic diagram of the installation structure of the positioning and clamping assembly of the present invention from another angle; Figure 7 This is a schematic diagram of the positioning and clamping assembly and the rotary drive mechanism of the present invention; Figure 8 This is a schematic diagram of the external structure of the positioning and clamping assembly of the present invention; Figure 9 This is a schematic diagram of the structure of the positioning clamping assembly of the present invention with the positioning end plate removed; Figure 10 This is a schematic diagram of the structure of the clamping arm and driving mechanism of the present invention; Figure 11 This is a schematic diagram of the structure of the present invention when multiple clamping arms clamp the valve body; Figure 12 This is a schematic diagram of the structure of the clamping arm and valve body of the present invention; Figure 13 This is a schematic diagram of the clamping arm of the present invention.

[0021] In the diagram: 1. Stand; 2. Inclined positioning unit; 3. Horizontal positioning unit; 4. Base plate; 5. Positioning and clamping assembly; 6. Rotary seat; 7. Positioning end plate; 8. Clamping arm; 9. Clamping part; 10. Drive mechanism; 11. First limiting ball; 12. Second limiting ball; 13. Third limiting ball; 14. Cooling vent; 15. Rotary drive mechanism; 16. Connecting rod; 17. Pull block; 18. Screw; 19. Spring; 20. Guide groove; 21. Guide rod; 22. Adjusting handle; 23. Slide rail; 25. Connecting block; 27. Drive motor; 28. Gear set; 29. ​​End face ball. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Reference Figures 1 to 4 The present invention provides a welding fixture for valve body processing, including a frame 1, on which an inclined positioning unit 2 is rotatably mounted. The inclined positioning unit 2 is used to position the port with an inclined angle on the valve body, such as the inclined port of a Y-type valve or an angled three-way valve. The inclined positioning unit 2 itself is equipped with an angle locking structure.

[0024] The tilt positioning unit 2 includes a base plate 4. Linear guide rails 23 are formed on both sides of the base plate 4. Locking nuts are fitted inside the guide rails 23. Correspondingly, connecting blocks 25 are fixedly mounted on both sides of the platform 1. Locking bolts pass through the connecting blocks 25 and extend into the guide rails 23, engaging with the internal locking nuts. When the tilt angle needs adjustment, the locking bolts are loosened, allowing the base plate 4 to rotate around the center of rotation of the connecting block 25 to the desired angle. Simultaneously, the guide rails 23 can slide relative to the connecting block 25, adjusting the overall position of the tilt positioning unit 2. Afterwards, tightening the locking bolts securely locks the tilt positioning unit 2 at the current angle and working position.

[0025] Two horizontal positioning units 3 are symmetrically arranged on both sides of the mounting platform 1. These two units are used to position the ports extending horizontally on the valve body. The bottom of the base plate 4 of each horizontal positioning unit 3 is equipped with an electric or manual slide rail, which allows it to slide smoothly along the transverse guide rail of the mounting platform 1. After reaching the predetermined position, the position is locked by a corresponding locking mechanism (such as a locking handle or an electric brake). The spacing between the two horizontal positioning units can be adjusted to accommodate valve bodies of different specifications and port spacings. It also facilitates the installation and removal of the valve body. When installing the valve body, the horizontal positioning units can be slid to both sides first to leave enough installation space. After the valve body is positioned, the position locking structure of the locking slide rail is tightened to ensure that the horizontal positioning units are fixed and provide stable horizontal support for the valve body.

[0026] Reference Figures 5 to 8 Whether it is the tilting positioning unit 2 or the horizontal positioning unit 3, a positioning clamping assembly 5 is installed on the base plate 4. The positioning clamping assembly 5 is used to fix the corresponding port of the valve body and the flange connected to the port. The positioning clamping assembly 5 specifically includes a rotating seat 6, a positioning end plate 7 and multiple clamping arms 8.

[0027] The rotating base 6 is rotatably mounted on the base plate 4 via bearings, enabling it to rotate smoothly relative to the base plate 4. The positioning end plate 7 is fixedly mounted on the rotating base 6 and rotates synchronously with the rotating base 6. Its end face is used to abut against the end face of the valve body port, serving as an axial positioning function. Multiple clamping arms 8 are evenly arranged circumferentially along the positioning end plate 7. The middle of each clamping arm 8 is rotatably connected to the positioning end plate 7, with a clamping part 9 at one end and a drive mechanism 10 connected to the other end.

[0028] See Figures 9 to 13 The main function of the drive mechanism 10 is to provide clamping force for the clamping arm 8. In this embodiment, the drive mechanism 10 is located inside the rotary seat 6 and includes a connecting rod 16, a pull block 17, a screw 18, and a spring 19. The specific connection relationship is as follows: a guide groove 20 is provided in the middle of the clamping arm 8, and a guide rod 21 passes through the guide groove 20. The two ends of the guide rod 21 are rotatably connected to the positioning end plate 7, thereby forming the rotation fulcrum of the clamping arm 8. The end of the clamping arm 8 away from the clamping part 9 is rotatably connected to one end of the connecting rod 16, and the other end of the connecting rod 16 is fitted and connected to the pull block 17. The lower part of the pull block 17 is fixedly connected to the upper end of the screw 18. The screw 18 passes through the bottom of the rotary seat 6 and the base plate 4 in sequence, and its lower end is threadedly connected to an adjusting handle 22. A spring 19 is also sleeved on the screw 18. The upper end of the spring 19 abuts against the lower end face of the pull block 17, and the lower end abuts against the inner wall of the rotary seat 6. When the operator rotates the adjusting handle 22, the screw 18 moves up and down along its axis, which in turn drives the clamping arm 8 to rotate around the guide rod 21 via the pull block 17 and connecting rod 16, thereby clamping or loosening the clamping part 9 on the valve body port and flange. The adjusting handle 22 has a built-in torque sensor, which is electrically connected to the intelligent control module. When the rotational torque reaches a preset threshold, the intelligent control module issues a warning signal to avoid over-clamping and deformation of the workpiece, while ensuring that the clamping force meets the welding requirements.

[0029] It should be noted that, in order to ensure that the clamping arm 8 can rotate smoothly with the rotating seat 6 during the subsequent welding process while clamping, this embodiment is provided with a first limiting ball 11, a second limiting ball 12, and a third limiting ball 13 on the clamping part 9. These three balls limit the clamped valve body port and flange from three different directions: the first limiting ball 11 abuts against the outer wall of the valve body port, the second limiting ball 12 abuts against the outer wall of the flange, and the third limiting ball 13 abuts against the end face of the flange facing the valve body. At the same time, multiple circumferentially distributed end face balls 29 are also embedded in the part of the positioning end plate 7 that contacts the end face of the valve body. This multi-point, multi-directional ball contact method not only achieves high-precision positioning of the workpiece, but also minimizes the sliding friction resistance during rotation, ensuring the smoothness of the overall rotation of the clamping assembly and avoiding the impact of friction jamming on the welding quality.

[0030] like Figure 7 and Figure 8 As shown, the rotary table 6 is driven to rotate by an independent rotary drive mechanism 15. The rotary drive mechanism 15 includes a drive motor 27 and a gear set 28. The output shaft of the drive motor 27 is connected to the rotary table 6 through the gear set 28. When welding the current port, the control system controls the rotary table 6 corresponding to that port to start rotating, while all other rotary tables 6 that are not being welded remain stationary. When the rotary table 6 rotates, it will drive the positioning end plate 7 fixedly connected to it and all the clamping arms 8 installed on the positioning end plate 7 to rotate synchronously as a whole. As the clamping arms 8 rotate, the area to be welded that was originally covered by the clamping arms 8 will be gradually exposed to the welding torch during the rotation process, so that the welding torch can complete 360° uninterrupted continuous welding along the circumferential seam, fundamentally avoiding physical interference between the welding torch and the tooling, and completely eliminating the welding dead zone that exists in traditional welding processes.

[0031] Meanwhile, this embodiment also integrates a cooling vent 14 on the clamping part 9. The opening direction of the cooling vent 14 is designed to face the weld seam at the connection between the valve body port and the flange. The cooling vent 14 is connected to a cooling gas source such as compressed air or inert protective gas through a pipeline. When the clamping arm 8 rotates with the rotating seat 6, the cooling vent 14 also rotates synchronously. It should be noted that each clamping arm 8 is equipped with a cooling vent 14, but only the clamping arm 8 located behind the welding torch in the rotation direction opens the cooling vent 14, aiming at the area behind the welding torch that has just been welded. By spraying cooling gas into the high-temperature weld seam area, the solidification speed of the weld metal is accelerated, the time when the molten pool is in a liquid state is shortened, the pulling effect of gravity on the molten pool is offset, and gravity-induced welding defects such as undercut and weld beads are reduced, thereby improving the forming quality of the circumferential weld.

[0032] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0033] The steps involved in this application are as follows: S1: According to the model and specifications of the valve body to be processed, adjust the distance between the two horizontal positioning units 3 on the frame 1, and slide them along the transverse guide rail to the predetermined position through the electric slide rail or manual slide rail, and lock them to ensure that they correspond to the positions of the ports at both ends of the valve body in the horizontal direction; at the same time, loosen the locking bolts on the connecting blocks 25 on both sides of the tilt positioning unit 2, so that the base plate 4 rotates around the rotation center, and the slide rail 23 slides relative to the connecting block 25. After adjusting the base plate 4 to the position that is consistent with the angle of the inclined port of the valve body, tighten the locking bolts to lock the angle and working position of the tilt positioning unit 2.

[0034] S2: Hoist or place the valve body on the stand 1, so that the horizontal port of the valve body corresponds to the positioning clamping components 5 of the two horizontal positioning units 3 respectively, and the oblique port of the valve body corresponds to the positioning clamping components 5 of the inclined positioning unit 2; if there is insufficient space, the horizontal positioning unit 3 can be slid to both sides first to reserve installation space, and then slid to the working position and locked after the valve body is in place.

[0035] S3: Operate the horizontal positioning unit 3 and the tilt positioning unit 2 respectively. Rotate the adjusting handle 22 to move the screw 18 axially. Through the pull block 17 and the connecting rod 16, drive the clamping arm 8 to rotate around the guide rod 21. This causes the first limiting ball 11, the second limiting ball 12 and the third limiting ball 13 on the clamping part 9 to press against the valve body port and the flange from different directions. At the same time, the end face ball 29 on the positioning end plate 7 abuts against the valve body end face, thus completing the axial positioning and clamping of each port of the valve body.

[0036] S4: Move the welding torch to the connection between the valve body port to be welded and the flange, start the intelligent control module, and instruct the rotation drive mechanism 15 of the rotary seat 6 corresponding to the port to start. The drive motor 27 drives the rotary seat 6, the positioning end plate 7 and the clamping arm 8 to rotate synchronously through the gear set 28. The rotation speed runs according to the preset parameters, while the other rotary seats 6 that are not welded remain stationary.

[0037] S5: During the rotation of the rotary table 6, the welding torch moves along the weld seam trajectory, performing 360° continuous welding on the circumferential weld area that is gradually exposed as the rotary table 6 rotates; at the same time, the control system opens the cooling air vent 14 on the clamping arm 8 located behind the welding torch in the rotation direction, and sprays cooling gas into the high-temperature weld seam area that has just been welded through the external cooling gas source of the pipeline, accelerating the solidification of the weld seam until the entire circumferential weld seam of this port is completed; during the welding process, the intelligent control module collects the temperature signal of the welding area in real time, and automatically adjusts the cooling gas flow rate and the rotation speed of the rotary table according to the temperature change.

[0038] S6: After the current port is welded, the rotary seat 6 stops rotating and the cooling vent 14 is closed; repeat steps S4 to S5 to weld the remaining ports of the valve body in sequence until all circumferential welds of all ports are completed.

[0039] S7: After all welds have cooled, rotate the adjusting handle 22 on each positioning unit in the opposite direction to loosen the clamping part 9 of the clamping arm 8 and release the clamping of the flanges at each port of the valve body; slide the horizontal positioning unit 3 to both sides to leave space for disassembly and remove the welded valve body from the tooling.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A welding fixture for machining a valve body, characterized in that, It includes a platform (1), an inclined positioning unit (2), and two horizontal positioning units (3), wherein the inclined positioning unit (2) and the two horizontal positioning units (3) each include: substrate(4); The positioning and clamping assembly (5) is mounted on the base plate (4) and is used to fix the valve body port and the flange connected to the port; The positioning and clamping assembly (5) includes: a rotating base (6), a positioning end plate (7), and multiple clamping arms (8); The rotating base (6) is rotatably mounted on the base plate (4); The positioning end plate (7) is fixedly installed on the rotary seat (6); Multiple clamping arms (8) are arranged circumferentially along the positioning end plate (7). The middle part of each clamping arm (8) is rotatably connected to the positioning end plate (7), and one end of it is provided with a clamping part (9) and the other end is connected to a drive mechanism (10). The drive mechanism (10) is used to drive the clamping part (9) to clamp or release the valve body port and the flange; The clamping part (9) is also provided with a cooling air vent (14) facing the weld seam where the valve body port and the flange are connected. The rotating seat (6) is driven to rotate by the rotation drive mechanism (15), which drives the positioning end plate (7) and the clamping arm (8) to rotate synchronously, so that the welding area is gradually exposed to achieve continuous welding of the circumferential seam, and the welded area is cooled synchronously by the cooling air vent (14).

2. The welding fixture for valve body processing according to claim 1, characterized in that, The clamping part (9) is provided with a first limiting ball (11), a second limiting ball (12) and a third limiting ball (13), which are respectively used to abut against the outer wall of the valve body port, the outer wall of the flange and the end face of the flange facing the valve body. The positioning end plate (7) is fitted with multiple end face balls (29) in the contact part with the valve body. The multiple end face balls (29) are evenly distributed circumferentially on the positioning end plate (7).

3. The welding fixture for valve body processing according to claim 2, characterized in that, The drive mechanism (10) is located inside the rotary seat (6) and includes a connecting rod (16), a pull block (17), a screw (18) and a spring (19). The clamping arm (8) has a guide groove (20) in the middle, and a guide rod (21) is provided in the guide groove (20). The guide rod (21) is rotatably connected to the positioning end plate (7). The end of the clamping arm (8) away from the clamping part (9) is rotatably connected to one end of the connecting rod (16), and the other end of the connecting rod (16) is fitted to the pull block (17). The lower part of the pull block (17) is fixedly connected to the upper end of the screw (18). The screw (18) passes through the rotating seat (6) and the base plate (4), and the lower end is threadedly connected to the adjusting handle (22). A spring (19) is fitted on the screw (18). The upper end of the spring (19) abuts against the pull block (17), and the lower end abuts against the inner wall of the rotating seat (6). Rotating the adjusting handle (22) drives the screw (18) to move axially. Through the pull block (17) and the connecting rod (16), the clamping arm (8) rotates around the guide rod (21) to achieve clamping or loosening of the valve body port and flange.

4. The welding fixture for valve body processing according to claim 3, characterized in that, The tilting positioning unit (2) is rotatably mounted on the frame (1) and has an angle locking structure; Two horizontal positioning units (3) are symmetrically arranged on both sides of the frame (1). The bottom of each horizontal positioning unit (3) is slidably engaged with the frame (1) and has a position locking structure.

5. The welding fixture for valve body processing according to claim 4, characterized in that, The tilting positioning unit (2) includes a base plate (4), and slide rails (23) are provided on both sides of the base plate (4). Locking nuts are installed in the slide rails (23). The platform (1) has connecting blocks (25) fixed on both sides of the tilt positioning unit (2). Locking bolts are installed on the connecting blocks (25). The locking bolts are locked in conjunction with the locking nuts in the slide rail (23) to adjust and lock the tilt angle and working position of the tilt positioning unit (2).

6. The welding fixture for valve body processing according to claim 5, characterized in that, The bottom of the base plate (4) of the horizontal positioning unit (3) is provided with an electric slide rail or a manual slide rail to achieve sliding installation and locking with the frame (1).

7. The welding fixture for valve body processing according to claim 6, characterized in that, The rotary drive mechanism (15) includes a drive motor (27) and a gear set (28), wherein the drive motor (27) is connected to the rotary table (6) via the gear set (28); When welding the current port, only the rotating seat (6) corresponding to that port is in a rotating state, while the other rotating seats (6) remain stationary to ensure the overall stability of the valve body during the welding process.

8. The welding fixture for valve body processing according to claim 7, characterized in that, The cooling vent (14) is connected to an external cooling gas source, which is compressed air or inert protective gas. During the rotation of the clamping arm (8), the welded area is cooled in real time to accelerate the solidification of the weld and suppress the flow of the molten pool.

9. The welding fixture for valve body processing according to claim 8, characterized in that, Multiple clamping arms (8) are evenly arranged around the positioning end plate (7) to form a circumferential multi-point clamping structure, ensuring that the valve body port is coaxially positioned with the flange and is subjected to uniform force.

10. The welding fixture for valve body processing according to claim 9, characterized in that, It also includes an intelligent control module, which is electrically connected to the rotary drive mechanism (15), the drive mechanism (10), and the cooling air vent (14). The intelligent control module has a built-in welding parameter preset unit, which can preset the rotation speed of the rotary seat (6), the gas jet flow rate and the jet angle of the cooling air vent (14) according to the valve body material and flange specifications. It can also collect the temperature signal of the welding area in real time and automatically adjust the rotary seat rotation speed and the cooling gas flow rate.

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