Water ring vacuum pump impeller welding tooling

Abstract

The application discloses a water ring vacuum pump impeller welding tool, and relates to the technical field of pump machine welding. The tool comprises: an installation shaft intermittently connected to a rack for coaxially fixing and installing an impeller; a moving part is arranged to move relative to the rack along a direction parallel to the installation shaft axis, and the moving stroke of the moving part comprises: a first station located at the rear side of the impeller and a second station located at the front side of the impeller; a welding gun is rotatably connected to the moving part through a rotating shaft parallel to the installation shaft axis, and the rotating stroke of the welding gun comprises: a third station for aligning one of two parallel welding seams located between two adjacent blades and a fourth station for aligning the other; a driving assembly is used for driving the moving part to move and switch between the first station and the second station; and a passive trigger mechanism is assembled to trigger the welding gun to rotate and switch from the third station to the fourth station when the moving part moves to the second station, and trigger the welding gun to rotate and switch from the fourth station to the third station when the moving part moves to the first station.

Description

Technical Field

[0001] This invention relates to the field of pump welding technology, specifically to a welding fixture for a water ring vacuum pump impeller. Background Technology

[0002] The impeller of a water ring vacuum pump includes a hollow shaft, multiple arc-shaped blades, a disc, and a reinforcing ring. The blades are welded in a circumferential array to the periphery of the hollow shaft. The disc is welded to the hollow shaft to seal one end of the chamber formed between two adjacent blades. The reinforcing ring is welded to the end of each blade away from the disc to increase the strength of each blade and prevent blade deformation.

[0003] The traditional processing method for welding each blade to the hollow shaft involves workers first using a welding torch to spot weld each blade to the circumferential side of the hollow shaft for positioning, and then using the welding torch to completely weld along the joint between the blade and the hollow shaft in sequence. The joint between both sides of each blade and the hollow shaft must be welded to ensure that the blade and the hollow shaft are firmly connected together. Each blade needs to be welded in sequence, which is a rather cumbersome and labor-intensive operation.

[0004] Patent CN204419720U discloses a "water ring vacuum pump impeller blade welding fixture," which includes a motor reducer, an impeller, a pump shaft, and a pump shaft rotation support device. The pump shaft is coaxially fixed with the impeller, extending out of both ends of the impeller and rotatably supported on the pump shaft rotation support device. The motor reducer is fixed on a base. The impeller, pump shaft, and pump shaft rotation support device are all located on the upper side of the base. The motor reducer is connected to one end of the pump shaft via a universal joint. The universal joint allows for a large installation deviation of the motor reducer, making installation convenient and operation reliable. After welding a set of blades, the motor reducer drives the pump shaft to rotate via the universal joint, which in turn drives the impeller to rotate, moving the impeller to the next blade welding position for welding the next set of blades. This eliminates the need for workers to manually rotate the impeller, reducing labor and improving work efficiency.

[0005] In existing technologies such as the aforementioned patents, although the impeller can be driven to rotate automatically during welding to reduce the workload of workers, workers still need to weld each blade one by one, which is still a lot of work. Welding robots are generally used in relatively dangerous environments or automated production lines, and the procurement cost is relatively high. Summary of the Invention

[0006] The purpose of this invention is to provide a welding fixture for a water ring vacuum pump impeller to overcome the shortcomings of the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a welding fixture for a water ring vacuum pump impeller, comprising: a frame; a mounting shaft intermittently rotatably connected to the frame for coaxially fixing the impeller to be welded; a movable component that is movable relative to the frame along a direction parallel to the axis of the mounting shaft, the movable component having a first station located behind the impeller and a second station located in front of the impeller during its movement stroke; a welding torch rotatably connected to the movable component via a rotating shaft parallel to the axis of the mounting shaft, the welding torch having a third station aligned with one of two parallel weld seams located between two adjacent blades and a fourth station aligned with the other during its rotation stroke; a drive assembly for driving the movable component to move and switch between the first station and the second station; and a passive triggering mechanism configured to: trigger the welding torch to rotate from the third station to the fourth station when the movable component moves to the second station, and trigger the welding torch to rotate from the fourth station to the third station when the movable component moves to the first station.

[0008] Furthermore, the drive assembly includes an electric push rod, a pneumatic cylinder, or a hydraulic cylinder fixedly mounted on the frame, with its power output end connected to the moving part.

[0009] Furthermore, the passive triggering mechanism includes: a limiting rod, which is fixedly connected to the welding torch; an arc-shaped block, which is fixedly connected to the limiting rod, wherein a guide groove is formed on the arc-shaped surface of the arc-shaped block coaxial with the rotation axis, the guide groove including a connected spiral groove and an inclined groove; a fixed rod, which is fixedly connected to the frame; a sliding rod, which is slidably connected to the fixed rod, wherein the sliding rod has a triggering position located on the movement path of the guide groove and an avoidance position avoiding the movement path of the guide groove during its sliding stroke relative to the fixed rod; an elastic locking component, which is used to elastically lock the sliding rod in the triggering position and the avoidance position respectively; an abutment part and an abutment rod, both of which are A wedge-shaped rod is fixedly connected to the sliding rod; an elastic unit, whose deformation recovery process drives the welding torch to rotate to the third position; when the moving part moves to the second position, the spiral groove and the inclined groove sequentially slide into the sliding rod located at the trigger position, so that the welding torch rotates from the third position to the fourth position, and the sliding rod moves to the clearance position, and the abutting rod abuts against the limiting rod; when the moving part moves to the first position, the wedge-shaped rod abuts against the abutting part, so that the sliding rod slides from the clearance position to the trigger position, and the abutting rod disengages from the limiting rod, and the elastic unit drives the welding torch to rotate to switch to the third position.

[0010] Furthermore, the interior of the fixed rod is hollow along its length, and the sliding rod is slidably inserted into the hollow structure to achieve a sliding connection with the fixed rod.

[0011] Furthermore, the elastic locking component includes two limiting holes formed on the fixed rod and an elastic buckle provided on the sliding rod. The two limiting holes are arranged along the length direction of the fixed rod. The elastic buckle includes a ball and a compression spring. A slide rail is provided on the side of the sliding rod. The ball is slidably disposed in the slide rail. One end of the compression spring located in the slide rail abuts against the closed end of the slide rail, and the other end abuts against the ball. The opening of the slide rail is constricted to restrict the ball from sliding out of the slide rail.

[0012] Furthermore, the mounting shaft includes a shaft body adapted to the hollow shaft of the impeller, a first limiting plate is provided at the rear end of the shaft body, a screw is provided at the front end of the shaft body, a screw sleeve is screwed onto the screw, and a second limiting plate is fixedly connected to the screw sleeve.

[0013] Furthermore, the mounting shaft is intermittently driven by a stepper motor mounted on the frame.

[0014] In the above technical solution, the present invention provides a welding fixture for a water ring vacuum pump impeller. During the process of the drive component driving the moving part from the first station to the second station, the welding torch located at the third station is driven to weld one of the two parallel weld seams between two adjacent blades. When the moving part reaches the second station, the welding torch is rotated to the fourth station. During the process of the moving part moving back from the second station to the first station, the welding torch is driven to weld the other of the two parallel weld seams. When the moving part returns to the first station, the welding torch is rotated and reset to the third station. That is, in one round trip of the moving part, the welding torch completes the welding of the two parallel weld seams between two adjacent blades and resets. Then the mounting shaft drives the impeller to rotate, so that the next set of two parallel weld seams to be welded on the impeller corresponds to the welding torch. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1-2 This is a schematic diagram of the structure provided in an embodiment of the present invention when the movable part is located at the first station and the welding gun is located at the third station;

[0017] Figure 3 Provided for embodiments of the present invention Figure 1 Enlarged view of the structure at point A in the image;

[0018] Figure 4 Provided for embodiments of the present invention Figure 2 Enlarged view of the structure at point B in the image;

[0019] Figure 5This is a schematic diagram of the guide groove provided in an embodiment of the present invention;

[0020] Figure 6 A schematic diagram of the connection structure of the fixed rod, movable rod, abutting part and abutting rod provided in an embodiment of the present invention;

[0021] Figure 7 This is a schematic diagram of the structure of the elastic engaging component provided in an embodiment of the present invention;

[0022] Figure 8-9 This is a schematic diagram of the structure provided in an embodiment of the present invention when the movable part is located at the second station and the welding gun is located at the fourth station;

[0023] Figure 10 Provided for embodiments of the present invention Figure 9 Enlarged view of the structure at point C in the image;

[0024] Figure 11-13 A schematic diagram of the structure provided in an embodiment of the present invention when the moving part is located at the first station and the welding gun is located at the third station during welding of the impeller;

[0025] Figure 14-16 This is a schematic diagram of the structure provided in an embodiment of the present invention when the moving part is located at the second station and the welding gun is located at the fourth station during the welding of the impeller.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Frame; 2. Mounting shaft; 2.1. Shaft body; 2.2. First limiting plate; 2.3. Screw; 2.4. Screw sleeve; 2.5. Second limiting plate; 3. Moving part; 4. Welding torch; 5. Drive assembly; 6. Passive triggering mechanism; 6.1. Limiting rod; 6.2. Arc block; 6.3. Guide groove; 6.31. Spiral groove; 6.32. Straight groove; 6.33. Inclined groove; 6.4. Fixed rod; 6.5. Sliding rod; 6.6. Elastic engaging part; 6.61. Limiting hole; 6.62. Ball bearing; 6.63. Compression spring; 6.7. First connecting rod; 6.8. Second connecting rod; 6.9. Abutment part; 6.10. Abutment rod; 6.11. Wedge rod; 6.12. Elastic unit; 7. Stepper motor; 8. Third connecting rod. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Please see Figure 1-16This invention provides a welding fixture for a water ring vacuum pump impeller, comprising a frame 1, a mounting shaft 2, a movable component 3, a welding torch 4, a drive assembly 5, and a passive triggering mechanism 6. The mounting shaft 2 is intermittently rotatably connected to the frame 1 for coaxially fixing the impeller to be welded. Preferably, the mounting shaft 2 is intermittently driven by a stepper motor 7 mounted on the frame 1. The movable component 3 is movable relative to the frame 1 along a direction parallel to the axis of the mounting shaft 2. The movable component 3 has a first position located behind the impeller and a second position located in front of the impeller during its travel. The welding torch 4 is rotatably connected to the movable component 3 via a rotating shaft parallel to the axis of the mounting shaft 2. Specifically, a third connecting rod 8 is fixedly connected to the welding torch 4. The welding torch 4 is rotatably connected to the moving part 3. During its rotation stroke, the welding torch 4 has a third position aligned with one of the two parallel welding seams located between two adjacent blades and a fourth position aligned with the other. The drive assembly 5 is used to drive the moving part 3 to move and switch between the first position and the second position. Preferably, the drive assembly 5 is an electric push rod, cylinder or hydraulic cylinder fixedly mounted on the frame 1, and its power output end is connected to the moving part 3. The drive assembly 5 can also adopt other mechanisms in the prior art that can output linear reciprocating motion. The passive triggering mechanism 6 is assembled such that when the moving part 3 moves to the second position, it triggers the welding torch 4 to rotate from the third position to the fourth position, and when the moving part 3 moves to the first position, it triggers the welding torch 4 to rotate from the fourth position to the third position.

[0030] In the above technical solution, the present invention provides a welding fixture for a water ring vacuum pump impeller. During the process of the driving component 5 driving the moving part 3 from the first station to the second station, the welding torch 4 located at the third station is driven to weld one of the two parallel weld seams between two adjacent blades. When the moving part 3 reaches the second station, the welding torch 4 is rotated to the fourth station. During the process of the moving part 3 moving back from the second station to the first station, the welding torch 4 is driven to weld the other of the two parallel weld seams. When the moving part 3 returns to the first station, the welding torch 4 is rotated back to the third station. That is, in one round trip of the moving part 3, the welding torch 4 completes the welding of the two parallel weld seams between two adjacent blades and resets. Then the mounting shaft 2 drives the impeller to rotate, so that the next set of two parallel weld seams to be welded on the impeller corresponds to the welding torch 4.

[0031] As a preferred embodiment of the present invention, the mounting shaft 2 includes a shaft body 2.1 adapted to the hollow shaft of the impeller. A first limiting plate 2.2 is provided at the rear end of the shaft body 2.1, and a screw 2.3 is provided at the front end of the shaft body 2.1. A threaded sleeve 2.4 is screwed onto the screw 2.3, and a second limiting plate 2.5 is fixedly connected to the threaded sleeve 2.4. The hollow shaft of the impeller is fitted onto the shaft body 2.1, with the rear side of the impeller abutting against the first limiting plate 2.2. Then, the threaded sleeve 2.4 is screwed onto the screw 2.3, causing the second limiting plate 2.5 to abut against the front side of the impeller, thereby locking the impeller onto the shaft body 2.1. The mounting shaft 2 can then drive the impeller to rotate intermittently.

[0032] As a preferred embodiment of the present invention, the passive triggering mechanism 6 includes a limiting rod 6.1, an arc-shaped block 6.2, a fixing rod 6.4, a sliding rod 6.5, an elastic engaging member 6.6, an abutment part 6.9, an abutment rod 6.10, a wedge-shaped rod 6.11, and an elastic unit 6.12. The limiting rod 6.1 is fixedly connected to the welding torch 4, and its length extends along the moving direction of the moving member 3. The arc-shaped block 6.2 is fixedly connected to the limiting rod 6.1. A guide groove 6.3 is formed on the arc-shaped surface of the arc-shaped block 6.2, which is coaxial with the rotation axis. The guide groove 6.3 includes a connected spiral groove 6.31 and an inclined groove 6.33. The inclined groove 6.33 extends along the length of the limiting rod 6.1 from the bottom of the spiral groove 6.31 to the surface of the arc-shaped block 6.2. The guide groove 6.3 is arranged at an incline; or preferably, the guide groove 6.3 includes a spiral groove 6.31, a straight groove 6.32, and an inclined groove 6.33 connected in sequence. The straight groove 6.32 is used for the transition between the spiral groove 6.31 and the inclined groove 6.33. Specifically, the length direction of the straight groove 6.32 is consistent with the length direction of the limiting rod 6.1, and the depth of the straight groove 6.32 is consistent with the depth of the spiral groove 6.31. The inclined groove 6.33 is arranged at an incline along the length direction of the limiting rod 6.1 from the bottom of the straight groove 6.32 to the surface of the arc block 6.2. The fixed rod 6.4 is fixedly connected to the frame 1 through the first connecting rod 6.7, and the sliding rod 6.5 is slidably connected to the fixed rod 6.4. Preferably, the interior of the fixed rod 6.4 is hollow along its length direction, and the sliding rod 6.5 is slidably inserted. Within the hollow structure, a sliding connection is achieved with the fixed rod 6.4. During its sliding stroke relative to the fixed rod 6.4, the sliding rod 6.5 has a trigger position on the moving path of the guide groove 6.3 and a clearance position avoiding the moving path of the guide groove 6.3. An elastic locking member 6.6 is used to elastically lock the sliding rod 6.5 at the trigger position and the clearance position, respectively. The abutment part 6.9 and the abutment rod 6.10 are both fixedly connected to the sliding rod 6.5. Specifically, after the abutment rod 6.10 rises with the sliding rod 6.5, the bottom end of the abutment rod 6.10 can abut against the limiting groove on the limiting rod 6.1, thereby preventing the limiting rod 6.1 from rotating with the welding torch 4. The wedge-shaped rod 6.11 is fixedly connected to the moving part 3 via the second connecting rod 6.8. Selectedly, a rotating cylinder is fitted on the abutment part 6.9, and the wedge rod 6.11 rolls with the rotating cylinder, which can reduce the sliding wear between the wedge rod 6.11 and the abutment part 6.9; the process of the elastic unit 6.12 restoring its deformation drives the welding torch 4 to rotate to the third position. The elastic unit 6.12 is preferably a torsion spring, which is movably fitted on the rotating shaft. One end of the torsion spring is fixedly connected to the moving part 3, and the other end is fixedly connected to the third connecting rod 8; when the moving part 3 moves to the second position, the spiral groove 6.31, the straight groove 6.32, and the inclined groove 6.33 sequentially slide with the sliding rod 6.5 located at the trigger position, so that the welding torch 4 rotates from the third position to the fourth position, and the sliding rod 6.5 moves to the avoidance position, and the abutment rod 6.10 abuts against the limiting rod 6.1. When the moving part 3 moves to the first station, the wedge rod 6.11 engages with the abutment part 6.9, causing the sliding rod 6.5 to slide from the avoidance station to the trigger station, and causing the abutment rod 6.10 to disengage from the limiting rod 6.1. The elastic unit 6.12 then drives the welding torch 4 to rotate and switch to the third station.

[0033] As a preferred technical solution of the present invention, the elastic locking component 6.6 includes two limiting holes 6.61 formed on the fixed rod 6.4 and an elastic buckle provided on the sliding rod 6.5. The two limiting holes 6.61 are arranged along the length direction of the fixed rod 6.4. The elastic buckle includes a ball 6.62 and a compression spring 6.63. A slide rail is provided on the side of the sliding rod 6.5. The ball 6.62 is slidably disposed in the slide rail. One end of the compression spring 6.63 located in the slide rail abuts against the closed end of the slide rail, and the other end abuts against the ball 6.62. The opening of the slide rail is constricted to restrict the ball 6.62 from sliding out of the slide rail. The ball 6.62 can be locked into either limiting hole 6.61. That is, when the sliding rod 6.5 is in the trigger position, the ball 6.62 is locked into one of the limiting holes 6.61, and when the sliding rod 6.5 is in the avoidance position, the ball 6.62 is locked into the other limiting hole 6.61.

[0034] In the above technical solution, in the initial state, the moving part 3 is in the first station, the welding torch 4 is in the third station, and the sliding rod 6.5 is pressed by the wedge rod 6.11 at the trigger station through the abutment part 6.9. The abutment rod 6.10 is lower than the limit rod 6.1 and therefore does not abut against the limit rod 6.1. (See reference...) Figure 1-4 11-13; Then, the moving part 3 is driven by the drive assembly 5 to move from the first station to the second station. During this process, the moving part 3 drives the welding torch 4, the limiting rod 6.1, the arc block 6.2, and the wedge rod 6.11 to move together. The welding torch 4 welds one of the two parallel weld seams between two adjacent blades. When the moving part 3 is about to reach the second station, the spiral groove 6.31 on the arc block 6.2 and the sliding rod 6.5 make sliding contact and abutment, causing the arc block 6.2 and the limiting rod 6.1 to rotate. The elastic unit 6.12 is compressed and deformed to store energy. The limiting rod 6.1 drives the welding torch 4 to rotate together. The welding torch 4 is rotated from the third position to the fourth position. At this time, the welding torch 4 is aligned with the other of the two parallel welding seams. During the movement of the arc block 6.2 to the inclined groove 6.33 and the sliding rod 6.5 to slide and abut, the sliding rod 6.5 moves from the trigger position to the avoidance position relative to the fixed rod 6.4. This causes the abutment rod 6.10 to move upward and abut against the limiting rod 6.1, thus preventing the limiting rod 6.1 from rotating. Even after the sliding rod 6.5 is completely disengaged from the inclined groove 6.33, the elastic force of the energy-storing elastic unit 6.12 cannot cause the limiting rod 6.1 to rotate. That is, the welding torch 4 will not rotate. (See reference...) Figure 8-1014-16; Subsequently, the drive assembly 5 drives the moving part 3 to move in the reverse direction from the second station to the first station. During this period, the moving part 3 drives the welding torch 4, the limiting rod 6.1, the arc block 6.2, and the wedge rod 6.11 to move together. The welding torch 4 then performs welding operation on the other of the two parallel welding seams. When the moving part 3 is about to reach the first station, the wedge rod 6.11 and the abutment part 6.9 slide and abut against each other, squeezing the sliding rod 6.5 located at the avoidance station to the trigger station. The sliding rod 6.5 also drives the abutment rod 6.10 to move together, causing the abutment rod 6.10 to disengage from the abutment of the limiting rod 6.1. At this time, the elastic force of the elastic unit 6.12 is released, causing the welding torch 4, the limiting rod 6.1, and the arc block 6.2 to rotate. The welding torch 4 then rotates and resets from the fourth station to the third station. At this time, the invention returns to the previous state. Figure 1-4 The initial state is shown in Figures 11-13; then, the stepper motor 7 drives the mounting shaft 2 to rotate the impeller, so that the two parallel welding seams to be welded in the next group of impellers correspond to the welding gun 4, and the welding operation of the next group can be repeated.

[0035] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A welding fixture for a water ring vacuum pump impeller, characterized in that, include: frame; The mounting shaft is intermittently rotatably connected to the frame for coaxially fixing the impeller to be welded; The movable component is movable relative to the frame in a direction parallel to the axis of the mounting shaft. The movable component has a first station located behind the impeller and a second station located in front of the impeller during its travel. The welding torch is rotatably connected to the moving part via a rotating shaft parallel to the mounting axis. The rotation stroke of the welding torch has a third position for aligning with one of the two parallel welding seams located between two adjacent blades and a fourth position for aligning with the other. A drive component, used to drive a moving part to move and switch between a first station and a second station; A passive triggering mechanism is assembled such that: when the moving part moves to the second station, it triggers the welding torch to rotate from the third station to the fourth station; when the moving part moves to the first station, it triggers the welding torch to rotate from the fourth station to the third station. The passive triggering mechanism includes: A limiting rod is fixedly connected to the welding gun. An arc-shaped block is fixedly connected to a limiting rod. A guide groove is provided on the arc-shaped surface of the arc-shaped block that is coaxial with the rotation axis. The guide groove includes a connected spiral groove and an inclined groove. A fixing rod, which is fixedly connected to the frame; The sliding rod is slidably connected to the fixed rod. During its sliding stroke relative to the fixed rod, the sliding rod has a triggering position located on the moving path of the guide groove and an avoidance position that avoids the moving path of the guide groove. The elastic locking component is used to elastically lock the sliding rod at the triggering position and the avoidance position, respectively. The abutting part and the abutting rod are both fixedly connected to the sliding rod; A wedge-shaped rod, which is fixedly connected to the moving part; The elastic element, through its process of restoring deformation, drives the welding torch to rotate to the third position; When the moving part moves to the second station, the spiral groove and the inclined groove sequentially slide into the sliding rod located at the trigger station, so that the welding torch rotates from the third station to the fourth station and moves the sliding rod to the clearance station, and the abutting rod abuts against the limiting rod; when the moving part moves to the first station, the wedge rod abuts against the abutting part, so that the sliding rod slides from the clearance station to the trigger station and the abutting rod disengages from the limiting rod, and the elastic unit releases its elastic force to drive the welding torch to rotate and switch to the third station.

2. The welding fixture for a water ring vacuum pump impeller according to claim 1, characterized in that, The drive assembly includes an electric push rod, a pneumatic cylinder, or a hydraulic cylinder fixedly mounted on the frame, with its power output end connected to the moving part.

3. The welding fixture for a water ring vacuum pump impeller according to claim 1, characterized in that, The fixed rod has a hollow structure along its length, and the sliding rod is slidably inserted into the hollow structure to achieve a sliding connection with the fixed rod.

4. The welding fixture for a water ring vacuum pump impeller according to claim 3, characterized in that, The elastic locking component includes two limiting holes on the fixed rod and an elastic buckle on the sliding rod. The two limiting holes are arranged along the length of the fixed rod. The elastic buckle includes a ball and a compression spring. A slide rail is provided on the side of the sliding rod. The ball is slidably disposed in the slide rail. One end of the compression spring located in the slide rail abuts against the closed end of the slide rail, and the other end abuts against the ball. The opening of the slide rail is constricted to restrict the ball from sliding out of the slide rail.

5. The welding fixture for a water ring vacuum pump impeller according to claim 1, characterized in that, The mounting shaft includes a shaft body adapted to the hollow shaft of the impeller, a first limiting plate is provided at the rear end of the shaft body, a screw is provided at the front end of the shaft body, a screw sleeve is screwed onto the screw, and a second limiting plate is fixedly connected to the screw sleeve.

6. The welding fixture for a water ring vacuum pump impeller according to claim 1, characterized in that, The mounting shaft is driven by a stepper motor mounted on the frame for intermittent rotation.

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