A water pump impeller laser welding device and process

Abstract

The present application relates to the technical field of welding, especially to a water pump impeller laser welding device and process, comprising a machining table, the lower surface of the machining table is fixedly installed with a chassis, the upper surface of the machining table is slidably penetrated with a lifting column through a lifting mechanism, the outer surface of the lifting column is provided with a plurality of hiding grooves arranged in a ring array, the inner side upper end of the hiding groove is rotatably connected with a pressing plate, the lower surface of the pressing plate and the end away from the lifting column are provided with a pressing opening, the present application can assist the quick and accurate positioning of the wheel disc and the blade, is convenient to operate, improves the welding precision, after the positioning of the wheel disc and the blade is completed, the welding can be automatically carried out, after the welding is completed, the workpiece can be taken down by lifting, the operation process is convenient, in the welding process, the taking down operation of the sample plate in the approximate traditional process is not needed, the safety of the workers and the safety of the equipment parts are improved, and the process steps are simplified.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, and in particular to a water pump impeller laser welding device and process. Background Art

[0002] The impeller's blades are the key structure for achieving fluid pressure, while the disc is the foundational component that supports the blades. During welding, the edges of the blades must be connected to the corresponding positions of the disc to form a complete impeller.

[0003] During the laser welding of the water pump impeller, a robotic arm is used to control the laser welding head for flexible welding. However, the existing technology often uses a template positioning method to position the blades during welding, and makes an outer frame template that matches the contour of the blade end. When the blades are arranged, the end of the blade away from the center axis of the wheel is inserted into the inner side of the template. Afterwards, the robotic arm drives the laser welding head to weld along the connection. However, welding cannot be performed at the position where the blade is inserted into the inner side of the template. Therefore, after the welding is completed, the template is removed and the blade end position is repaired. The entire welding process is relatively cumbersome and requires the staff to remove the template midway. It is close to the workpiece and the laser welding head, which is prone to self-scalding problems. It is also easy to cause the workpiece to be misaligned and touch the laser welding head. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a water pump impeller laser welding device.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a water pump impeller laser welding equipment, comprising a processing table, the lower surface of the processing table is fixedly mounted with a base frame, the upper surface of the processing table is slidably penetrated by a lifting column through a lifting mechanism, the outer surface of the lifting column is provided with a plurality of hidden grooves distributed in a circular array, the inner upper end of the hidden groove is rotatably connected to a pressure plate, the lower surface of the pressure plate and the end away from the lifting column are provided with a pressure hole, the inner side of the lifting column is slidably penetrated by an insertion rod through a distance adjustment mechanism, the upper end of the outer surface of the insertion rod is fixedly connected to a plurality of pull ropes, the lower end of each of the pull ropes is respectively fixedly connected to the upper surface of a pressure plate, a welding mechanism is provided at the rear of the processing table, and a positioning piece is provided on the upper surface of the processing table and the outer surface close to the lifting column;

[0006] When the insertion rod is moved downward to release the drawstring, the pressure plate is rotated downward and stored inside the groove.

[0007] Preferably, the lifting mechanism includes a sliding plate installed on the inner bottom surface of the base frame through an elastic mechanism, a long-distance telescopic rod and a guide cylinder are fixedly installed on both sides of the upper surface of the sliding plate, the upper end of the long-distance telescopic rod is fixedly installed with the lifting plate, the upper end of the guide cylinder is slidably inserted with a guide rod, the upper end of the guide rod is fixedly installed on the lower surface of the lifting plate, and the lower end of the lifting column is fixedly connected to the upper surface of the lifting plate.

[0008] Preferably, the elastic mechanism includes a square tube fixedly embedded in the inner bottom surface of the base frame, the inner bottom surface of the square tube is fixedly embedded with an embedded plate, the sliding plate slides into the inner side of the square tube, the inner upper end of the square tube is fixedly connected with an upper limit convex edge, the inner side of the square tube and below the upper limit convex edge is fixedly connected with a lower limit convex edge, the sliding plate is located between the upper limit convex edge and the lower limit convex edge, and a number of springs are fixedly connected between the sliding plate and the embedded plate.

[0009] Preferably, the distance adjustment mechanism includes a concave frame fixedly mounted on the lower surface of the lifting plate, a short-distance telescopic rod is fixedly mounted on the inner bottom surface of the concave frame, the lower end of the insertion rod slides through the surface of the lifting plate, the telescopic end of the short-distance telescopic rod is fixedly connected to the lower end of the insertion rod, a stabilizing plate is fixedly sleeved on the lower end of the outer surface of the insertion rod, a guide column is fixedly connected to the lower surface of the lifting plate and on one side close to the insertion rod, and the stabilizing plate is slidably sleeved on the outer surface of the guide column.

[0010] Preferably, a wire passing opening is provided on the upper edge of the lifting column and corresponding to the upper end of each hidden slot.

[0011] Preferably, the positioning member includes a positioning ring arranged on the upper surface of the processing table, an inner convex ring is fixedly provided on the inner edge of the positioning ring, and no less than two through holes are provided on the upper surface of the positioning ring. A threaded hole is provided on the upper surface of the processing table, and each of the threaded holes is respectively located at the lower end of the through hole. A mounting bolt is slidably inserted into the inner side of the through hole, and the lower end of the mounting bolt is threadedly inserted into the inner side of the threaded hole.

[0012] Preferably, the welding mechanism includes a base fixedly mounted behind the processing table and the chassis, a vertical rail fixedly mounted on the upper end of the base, a movable end of the vertical rail fixedly connected to a robotic arm, and a laser welding head fixedly mounted on the front end of the robotic arm.

[0013] Preferably, the upper ends of the two side surfaces of the pressure plate are respectively fixedly connected with rotating shafts, and the rotating shafts are rotatably embedded in the inner wall of the recess.

[0014] A water pump impeller laser welding process is performed using the above-mentioned equipment, and the steps include:

[0015] S1. The lifting column is controlled to move upward by the lifting mechanism, and then the insertion rod is controlled to move downward relative to the lifting column by the distance adjustment mechanism, and the pressure plate is rotated downward and stored inside the groove;

[0016] S2. Place the wheel disc inside the positioning piece, with the center hole on the wheel disc sleeved on the outside of the lifting column, and place the blades roughly on the upper surface of the wheel disc;

[0017] S3. The control rod moves upward relative to the lifting column. Under the action of the pull rope, the pressure plate is unfolded, the lifting column is controlled to move downward, and the position of the blades is slightly adjusted so that each blade is completely stuck inside the pressure port;

[0018] S4. Welding the outer connection between the blade and the disc by a welding mechanism;

[0019] S5. Perform the action of S1, then weld the connection between the blade and the inner edge of the wheel, and then remove the welded workpiece.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention can assist in the rapid and accurate positioning of the wheel disc and the blades, is easy to operate, and improves welding accuracy;

[0022] The present invention can automatically perform welding after completing the positioning of the wheel disc and the blades. After the welding is completed, the worker can lift and remove the workpiece, and the operation process is convenient.

[0023] During welding, the present invention eliminates the need to remove the sample plate as in conventional processes, thereby improving the safety of the workers themselves and equipment components and simplifying the process steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a water pump impeller laser welding device according to the present invention;

[0025] Figure 2 This is a partial structural cross-sectional view of a water pump impeller laser welding device according to the present invention;

[0026] Figure 3 The present invention is a water pump impeller laser welding equipment Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 The present invention is a water pump impeller laser welding equipment Figure 2 Enlarged view of point B in the middle;

[0028] Figure 5 This is a cross-sectional view of a lifting column of a water pump impeller laser welding device according to the present invention;

[0029] Figure 6The present invention is a water pump impeller laser welding equipment Figure 5 Enlarged view of point C in the middle;

[0030] Figure 7 The present invention is a water pump impeller laser welding equipment Figure 5 Enlarged view of point D in the middle;

[0031] Figure 8 This is a schematic diagram of a lifting column of a water pump impeller laser welding device according to the present invention;

[0032] Figure 9 This is a state diagram of a water pump impeller laser welding device in use according to the present invention;

[0033] Figure 10 This is a schematic diagram of a water pump impeller laser welding device according to the present invention when the pressure plate is folded.

[0034] Among them: 1. Processing table; 2. Laser welding head; 3. Robotic arm; 4. Vertical rail; 5. Base; 6. Underframe; 7. Lifting column; 8. Hidden slot; 9. Pressing plate; 10. Rotating shaft; 11. Inserting rod; 12. Pull rope; 13. Wire pass; 14. Stabilizing plate; 15. Guide column; 16. Short-distance telescopic rod; 17. Concave frame; 18. Lifting plate; 19. Long-distance telescopic rod; 20. Sliding plate; 21. Guide cylinder; 22. Guide rod; 23. Spring; 24. Embedded plate; 25. Square cylinder; 26. Upper limit convex edge; 27. Lower limit convex edge; 28. Pressing mouth; 29. ​​Positioning ring; 30. Inner convex ring; 31. Through hole; 32. Threaded hole; 33. Mounting bolt; 34. Wheel; 35. Blade. DETAILED DESCRIPTION

[0035] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0036] like Figures 1-10 The laser welding equipment for water pump impellers shown in the figure comprises a processing table 1, a base frame 6 is fixedly installed on the lower surface of the processing table 1, a lifting column 7 is slidably penetrated on the upper surface of the processing table 1 through a lifting mechanism, a plurality of recessed grooves 8 distributed in a circular array are provided on the outer surface of the lifting column 7, a pressure plate 9 is rotatably connected to the inner upper end of the recessed groove 8, a pressure port 28 is provided on the lower surface of the pressure plate 9 and at one end away from the lifting column 7, an insertion rod 11 is slidably penetrated on the inner side of the lifting column 7 through a distance adjustment mechanism, a plurality of pull ropes 12 are fixedly connected to the upper end of the outer surface of the insertion rod 11, and the lower end of each pull rope 12 is fixedly connected to the upper surface of a pressure plate 9, a welding mechanism is provided at the rear of the processing table 1, and a positioning member is provided on the upper surface of the processing table 1 and the outer surface close to the lifting column 7;

[0037] The design of the recessed slot 8 needs to satisfy the following requirements: when the insertion rod 11 moves downward to release the pull rope 12, the pressing plate 9 rotates downward and is stored inside the recessed slot 8.

[0038] like Figure 5 As shown, the lifting mechanism includes a sliding plate 20 mounted on the inner bottom surface of the base frame 6 via an elastic mechanism. A long-distance telescopic rod 19 and a guide cylinder 21 are fixedly mounted on either side of the upper surface of the sliding plate 20. The upper end of the long-distance telescopic rod 19 is fixedly mounted to the lifting plate 18. A guide rod 22 is slidably inserted into the upper end of the guide cylinder 21. The upper end of the guide rod 22 is fixedly mounted to the lower surface of the lifting plate 18. The lower end of the lifting column 7 is fixedly connected to the upper surface of the lifting plate 18. The long-distance telescopic rod 19 uses an electric cylinder to precisely control the up and down movement of the lifting plate 18. During the extension and retraction of the lifting plate 18, the guide rod 22 slides relative to the guide cylinder 21, thereby ensuring stable movement of the lifting plate 18.

[0039] The telescopic length of the long telescopic rod 19 needs to satisfy the following requirements: when the lifting plate 18 moves upward to be close to the inner top surface of the base frame 6, the lower end of the pressing plate 9 does not contact the surface of the wheel disc 34 and the blade 35 when the pressing plate 9 rotates downward.

[0040] like Figure 2 、 Figure 3 As shown, the elastic mechanism includes a square tube 25 fixedly embedded in the inner bottom surface of the base frame 6. An embedded plate 24 is fixedly embedded in the inner bottom surface of the square tube 25. The sliding plate 20 slides into the inner side of the square tube 25. An upper limit flange 26 is fixedly connected to the inner upper end of the square tube 25. A lower limit flange 27 is fixedly connected to the inner side of the square tube 25 and below and near the upper limit flange 26. The sliding plate 20 is located between the upper limit flange 26 and the lower limit flange 27. A plurality of springs 23 are fixedly connected between the sliding plate 20 and the embedded plate 24. The upper limit flange 26 and the lower limit flange 27 have the function of limiting the range of movement of the sliding plate 20. The springs 23 are in a stretched state, providing tension for the sliding plate 20.

[0041] like Figure 5 、 Figure 7 As shown, the distance adjustment mechanism includes a concave frame 17 fixedly mounted on the lower surface of a lifting plate 18. A short-distance telescopic rod 16 is fixedly mounted on the inner bottom surface of the concave frame 17. The lower end of the insertion rod 11 slides through the surface of the lifting plate 18. The telescopic end of the short-distance telescopic rod 16 is fixedly connected to the lower end of the insertion rod 11. A stabilizing plate 14 is fixedly mounted on the lower end of the outer surface of the insertion rod 11. A guide post 15 is fixedly connected to the lower surface of the lifting plate 18, near the insertion rod 11. The stabilizing plate 14 slides over the outer surface of the guide post 15. The short-distance telescopic rod 16 uses an electric cylinder to flexibly control the retraction accuracy. The stabilizing plate 14 can slide up and down along the surface of the guide post 15, improving the stability of the movement of the insertion rod 11.

[0042] like Figure 5 、 Figure 6 As shown, a wire opening 13 is respectively provided at the upper edge of the lifting column 7 and corresponding to the upper end of each recessed slot 8. The wire opening 13 serves to guide the pull rope 12 and prevent the edge of the lifting column 7 from scratching the pull rope 12.

[0043] like Figure 2 、 Figure 3 As shown, the positioning member includes a positioning ring 29 disposed on the upper surface of the processing table 1. An inner convex ring 30 is fixedly provided on the inner edge of the positioning ring 29. The inner convex ring 30 can help the end of the blade 35 to be tightly positioned. The upper surface of the positioning ring 29 is provided with no fewer than two through-holes 31. The upper surface of the processing table 1 is provided with threaded holes 32, and each threaded hole 32 is located at the lower end of each through-hole 31. A mounting bolt 33 is slidably inserted into the inner side of the through-hole 31, and the lower end of the mounting bolt 33 is threadedly inserted into the inner side of the threaded hole 32. If the inner wall of the positioning ring 29 wears after long-term use, the positioning ring 29 can be quickly replaced by unscrewing the mounting bolts 33.

[0044] like Figure 1 As shown, the welding mechanism includes a base 5 fixedly mounted behind a processing table 1 and a chassis 6. A vertical rail 4 is fixedly mounted on the upper end of the base 5. A robotic arm 3 is fixedly connected to the movable end of the vertical rail 4. The front end of the robotic arm 3 is fixedly mounted with a laser welding head 2. The vertical rail 4 is a vertical servo slide, a high-precision mechanical device used to control and adjust the precise vertical position of an object. It can control the flexible raising and lowering of the robotic arm 3. The robotic arm 3 uses a multi-axis articulated robotic arm, which can flexibly control the movement of the laser welding head 2 and the welding angle.

[0045] like Figure 5 、 Figure 6 、 Figure 8 As shown, the upper ends of the two side surfaces of the pressing plate 9 are respectively fixedly connected with a rotating shaft 10, and the rotating shaft 10 is rotatably embedded in the inner wall of the hidden groove 8. The pressing plate 9 is rotated around the rotating shaft 10 and then received into the inner side of the hidden groove 8.

[0046] A water pump impeller laser welding process is performed using the above-mentioned equipment, and the steps include:

[0047] S1. The lifting column 7 is moved upward by the lifting mechanism, and then the insertion rod 11 is moved downward relative to the lifting column 7 by the distance adjustment mechanism, and the pressing plate 9 is rotated downward and stored inside the recess 8;

[0048] S2. Place the wheel disc 34 inside the positioning member, with the center hole of the wheel disc 34 sleeved on the outside of the lifting column 7, and place the blades 35 roughly on the upper surface of the wheel disc 34;

[0049] S3, the control rod 11 moves upward relative to the lifting column 7. Under the action of the pull rope 12, the pressure plate 9 is unfolded, the lifting column 7 is controlled to move downward, and the position of the blades 35 is slightly adjusted so that each blade 35 is completely stuck inside the pressure opening 28;

[0050] S4, welding the blade 35 and the outer connection of the wheel disc 34 by a welding mechanism;

[0051] S5, perform the action of S1, then weld the connection between the blade 35 and the wheel disc 34 close to the inner edge, and then remove the welded workpiece.

[0052] Specific working principle: During use, the staff first controls the long telescopic rod 19 to extend and control the lifting column 7 to move up. Then, by controlling the short telescopic rod 16 to retract, the control rod 11 moves downward relative to the lifting column 7, and the pull rope 12 is loosened. After that, the pressing plate 9 rotates with the rotating shaft 10 as the axis. The pull rope 12 passes through the inner side of the wire opening 13, and the pressing plate 9 rotates downward and is stored in the inner side of the hidden groove 8. At this time, the state of the pressing plate 9 is as follows: Figure 10 As shown, the staff then places the wheel disc 34 on the inner side of the positioning ring 29, and the center hole on the wheel disc 34 is sleeved on the outer side of the lifting column 7. Since the pressure plate 9 has been rotated and stored in the inner side of the recessed groove 8, it will not interfere with the wheel disc 34 being sleeved on the outer side of the lifting column 7. Then, the blade 35 is roughly placed on the upper surface of the wheel disc 34.

[0053] The staff controls the insertion rod 11 to move upward relative to the lifting column 7. Under the action of the pull rope 12, the pressure plate 9 is unfolded, the lifting column 7 is controlled to move downward, and the position of the blade 35 is slightly adjusted so that each blade 35 is completely stuck inside the pressure port 28. In the process of adjusting the blade 35, when the pressure plate 9 is pulled upward, the spring 23 can be stretched, and the sliding plate 20 slides up along the inner side of the square tube 25. After the pressure plate 9 moves upward, the position of the blade 35 can be flexibly adjusted to ensure that the pressure port 28 can be pressed tightly against the outer side of the blade 35, and the end of the blade 35 is pressed against the inner wall of the inner convex ring 30, thereby completing the positioning of the blade 35 and the wheel disc 34.

[0054] During welding, the position and angle of the laser welding head 2 are flexibly controlled by the robotic arm 3. The blade 35 and the wheel disc 34 are first welded at their outer connection. After welding, the blade 35 and the wheel disc 34 are relatively fixed in position. The lifting column 7 is first controlled to move upward, and then the insertion rod 11 is controlled to move downward relative to the lifting column 7. The pressure plate 9 rotates downward under the action of gravity and is stored inside the groove 8. When the blade 35 and the wheel disc 34 are no longer blocked, the blade 35 and the wheel disc 34 are welded at their inner connection. Finally, the worker removes the welded workpiece. Therefore, during the entire process, the worker only needs to arrange and remove the workpiece, and there is no need to operate at the workpiece position in the middle. This is safer, optimizes the welding process, and simplifies the worker's operating procedures.

[0055] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A water pump impeller laser welding device, comprising a processing table (1), characterized in that: The lower surface of the processing table (1) is fixedly mounted with a base frame (6), the upper surface of the processing table (1) is slidably penetrated by a lifting column (7) through a lifting mechanism, the outer surface of the lifting column (7) is provided with a plurality of recessed grooves (8) distributed in a circular array, the inner upper end of the recessed groove (8) is rotatably connected to a pressure plate (9), the lower surface of the pressure plate (9) and the end away from the lifting column (7) are provided with a pressure opening (28), the inner side of the lifting column (7) is slidably penetrated by an insertion rod (11) through a distance adjustment mechanism, the upper end of the outer surface of the insertion rod (11) is fixedly connected with a plurality of pull ropes (12), the lower end of each pull rope (12) is fixedly connected to the upper surface of a pressure plate (9), the rear side of the processing table (1) is provided with a welding mechanism, and the upper surface of the processing table (1) and the outer surface close to the lifting column (7) are provided with a positioning member; When the insertion rod (11) moves downward to loosen the drawstring (12), the pressing plate (9) rotates downward to be stored inside the recess (8); The lifting mechanism includes a sliding plate (20) mounted on the inner bottom surface of the base frame (6) through an elastic mechanism, a long telescopic rod (19) and a guide cylinder (21) are fixedly mounted on both sides of the upper surface of the sliding plate (20), a lifting plate (18) is fixedly mounted on the upper end of the long telescopic rod (19), a guide rod (22) is slidably inserted on the upper end of the guide cylinder (21), the upper end of the guide rod (22) is fixedly mounted on the lower surface of the lifting plate (18), and the lower end of the lifting column (7) is fixedly connected to the upper surface of the lifting plate (18); The distance adjustment mechanism includes a concave frame (17) fixedly mounted on the lower surface of the lifting plate (18), a short-distance telescopic rod (16) fixedly mounted on the inner bottom surface of the concave frame (17), the lower end of the insertion rod (11) slides through the surface of the lifting plate (18), the telescopic end of the short-distance telescopic rod (16) is fixedly connected to the lower end of the insertion rod (11), a stabilizing plate (14) is fixedly sleeved on the lower end of the outer surface of the insertion rod (11), a guide column (15) is fixedly connected to the lower surface of the lifting plate (18) and on a side close to the insertion rod (11), and the stabilizing plate (14) is slidably sleeved on the outer surface of the guide column (15).

2. The water pump impeller laser welding equipment according to claim 1, characterized in that: The elastic mechanism comprises a square tube (25) fixedly embedded in the inner bottom surface of the base frame (6), an embedded plate (24) fixedly embedded in the inner bottom surface of the square tube (25), the sliding plate (20) slidingly snaps into the inner side of the square tube (25), an upper limit convex edge (26) is fixedly connected to the inner upper end of the square tube (25), a lower limit convex edge (27) is fixedly connected to the inner side of the square tube (25) and close to the lower side of the upper limit convex edge (26), the sliding plate (20) is located between the upper limit convex edge (26) and the lower limit convex edge (27), and a plurality of springs (23) are fixedly connected between the sliding plate (20) and the embedded plate (24).

3. The water pump impeller laser welding equipment according to claim 1, characterized in that: A wire opening (13) is provided at the upper edge of the lifting column (7) and at the upper end of each recessed slot (8).

4. The water pump impeller laser welding equipment according to claim 1, characterized in that: The positioning member includes a positioning ring (29) arranged on the upper surface of the processing table (1), an inner convex ring (30) is fixedly arranged on the inner edge of the positioning ring (29), and no less than two through holes (31) are opened on the upper surface of the positioning ring (29). The upper surface of the processing table (1) is provided with a threaded hole (32), and each of the threaded holes (32) is respectively located at the lower end of the through hole (31). A mounting bolt (33) is slidably inserted into the inner side of the through hole (31), and the lower end of the mounting bolt (33) is threadedly inserted into the inner side of the threaded hole (32).

5. The water pump impeller laser welding equipment according to claim 1, characterized in that: The welding mechanism comprises a base (5) fixedly mounted behind a processing table (1) and a base frame (6); a vertical rail (4) is fixedly mounted on the upper end of the base (5); a movable end of the vertical rail (4) is fixedly connected to a robotic arm (3); and a laser welding head (2) is fixedly mounted on the front end of the robotic arm (3).

6. The water pump impeller laser welding equipment according to claim 1, characterized in that: The upper ends of the two side surfaces of the pressure plate (9) are respectively fixedly connected with rotating shafts (10), and the rotating shafts (10) are rotatably embedded in the inner wall of the hidden groove (8).

7. A laser welding process for a water pump impeller, using the equipment according to any one of claims 1 to 6, characterized in that: include: S1, the lifting column (7) is controlled to move upward by the lifting mechanism, and then the insertion rod (11) is controlled to move downward relative to the lifting column (7) by the distance adjustment mechanism, and the pressure plate (9) is rotated downward and stored inside the recess (8); S2. Place the wheel disc (34) on the inner side of the positioning member, with the center hole of the wheel disc (34) sleeved on the outer side of the lifting column (7), and place the blade (35) roughly on the upper surface of the wheel disc (34); S3, the control rod (11) moves upward relative to the lifting column (7), and under the action of the pull rope (12), the pressure plate (9) is unfolded, the control lifting column (7) moves downward, and the position of the blade (35) is slightly adjusted so that each blade (35) is completely stuck inside the pressure port (28); S4, welding the blade (35) and the wheel disc (34) at their outer edges by a welding mechanism; S5, perform the action of S1, then weld the inner connection of the blade (35) and the wheel disc (34), and then remove the welded workpiece.

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