A laser welding device and welding method for filtering paddle processing

Abstract

The application relates to the technical field of welding devices, and discloses a laser welding device and a welding method for filtering and stirring paddle processing, which comprises a welding machine main body, a mounting rack is fixed on one side of the welding machine main body, and a clamp and a positioning assembly are mounted on the mounting rack. The clamp, the driving assembly and the positioning assembly are arranged, the paddle shaft sleeve is fixed by the clamp, then the paddle blade is positioned by the positioning assembly, the paddle blade can be accurately butt-jointed with the paddle shaft sleeve for spot welding and pre-fixing, the driving assembly can also drive the shaft sleeve to rotate at equal angles, the accurate spot welding and pre-fixing of each paddle can be sequentially carried out, the welding precision of the paddle is improved, the processing quality of the paddle is improved, the stability of the paddle during use is ensured, in addition, the driving assembly can also control the paddle to make spiral compound motion in the subsequent process, the operator does not need to frequently move the welding gun by hand, the operation is simplified, the situation that the welding quality is reduced due to operation errors is reduced, and the processing quality is further improved.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically to a laser welding device and a welding method for processing filter stirring blades. Background Technology

[0002] Laser welding technology is a high-precision welding method that uses a high-energy-density laser beam as a heat source to melt and join materials. Its main principle is to generate a laser beam through a laser, which is then focused into a tiny spot by a lens or mirror. The high-energy-density laser beam irradiates the joint of the workpiece, causing the material to melt in a very short time, and then cools to form a weld.

[0003] The production of agitator blades often employs laser welding equipment, which involves sequentially welding multiple blades onto a central shaft. Due to cost and welding flexibility considerations, semi-automatic operation is still used. However, in the process of mass welding: the lack of a suitable blade positioning method can easily lead to uneven distribution of blade positions after welding, thus affecting the stability of the blades during use. Secondly, during manual operation, since the blade welding area is a spiral curve, it is necessary to move the welding torch along the spiral curve, which requires a high level of skill from the operator and can easily result in poor welding quality. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a laser welding device and a welding method for processing filter stirring blades, which has the advantages of convenient positioning, easy operation, and high welding quality, and solves the problems of difficult positioning and high operation difficulty when welding blades with existing welding equipment.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a laser welding device, comprising a welding machine body, a mounting frame fixed on one side of the welding machine body, a clamp and a positioning assembly mounted on the mounting frame, the clamp comprising a hollow shaft capable of passing through the inner cavity of a blade bushing, the clamp being used to clamp the blade bushing, the positioning assembly comprising a main positioning rod and a secondary positioning rod disposed above the clamp, the opposite edges of the main positioning rod and the secondary positioning rod being provided with notches for positioning the blades, and a driving assembly mounted on the mounting frame, the driving assembly being used to drive the clamp to rotate at equal angles, and the driving assembly being used to drive the clamp to move axially;

[0006] Before processing, the fixture moves to fix the blade bushing, the positioning component positions the blade, the welding machine body moves to spot weld and pre-fix a single blade, and the drive component moves to force the fixture to rotate at the same angle, thereby positioning and pre-fixing the next blade in sequence.

[0007] During processing, the positioning component operates, forcing the fixture to rotate and move axially, which in turn forces the blades to move along the welding trajectory, thereby reducing welding operations.

[0008] Preferably, the hollow shaft has a plurality of annularly arrayed strip holes on its outer wall. The clamp also includes a first bidirectional screw disposed inside the hollow shaft. Both ends of the first bidirectional screw are rotatably connected to the hollow shaft. Two nut seats are threaded onto the first bidirectional screw. Strip plates are inserted into each of the plurality of strip holes. Clamping blocks are fixed to the outer edges of the strip plates. The inner edges of the strip plates are connected to the two nut seats respectively through two support rods. Both ends of the support rods are hinged to the nut seats and the strip plates respectively. One end of the first bidirectional screw extends to the outside of the hollow shaft and is fixed with a main screw cap.

[0009] Preferably, the drive assembly includes a base shaft and a drive motor. The clamp is installed at the end of the base shaft. One end of the base shaft is rotatably connected to the mounting bracket. The other end of the base shaft passes through the side wall of the welding machine body and is rotatably connected to the side wall of the welding machine body. A driven gear is fixed at one end of the base shaft inside the welding machine body. The drive motor is fixed on the welding machine body. A driving gear is fixed on the output shaft of the drive motor. The driving gear meshes with the driven gear.

[0010] Preferably, the driven gear has multiple sets of staggered tooth blocks and positioning protrusions on its edge, the outer edge of the positioning protrusion is set as an inward concave arc, the driving gear is set as an incomplete gear, and the round edge of the incomplete gear matches the shape of the outer edge of the positioning protrusion.

[0011] Preferably, a circular groove is provided at the end of the base shaft, a push motor is fixedly connected in the circular groove, a push screw is fixed on the output shaft of the push motor, a threaded sleeve is threadedly connected to the push screw, the threaded sleeve is slidably connected to the inner cavity of the circular groove, and one end of the threaded sleeve extends to the outside of the circular groove and is fixedly connected to the end of the hollow shaft.

[0012] Preferably, the positioning component includes a slide rail, one end of which is mounted on a mounting bracket. A second bidirectional screw is provided inside the slide rail, both ends of which are rotatably connected to the slide rail. One end of the second bidirectional screw extends to the outside of the slide rail and is fixed with a secondary screw cap. Two sliders are slidably connected inside the slide rail, and both sliders are threadedly connected to the second bidirectional screw. A main positioning rod and a secondary positioning rod are respectively mounted on the top of the two sliders. Two limiting blocks are provided between the two sliders. The limiting blocks are slidably connected to the slide rail. An adjusting bolt is installed on the edge of the limiting block, and the bottom end of the adjusting bolt abuts against the surface of the slide rail.

[0013] Preferably, the top of the slider is provided with a channel, and the main positioning rod and the auxiliary positioning rod are respectively inserted into the channels on the two sliders. Both the main positioning rod and the auxiliary positioning rod are provided with linear holes, and both the main positioning rod and the auxiliary positioning rod are fixed to the slider by fastening bolts.

[0014] Preferably, one end of the slide rail is rotatably connected to the mounting bracket via a rotating shaft, the surface of the mounting bracket is also provided with a limiting groove, a limiting pin is also movably inserted into the slide rail, the bottom end of the limiting pin is inserted into the limiting groove, and a return spring is fixedly connected between the top end of the limiting pin and the slide rail, the return spring being sleeved outside the limiting pin.

[0015] Preferably, the mounting frame includes a horizontally arranged suspension, which is fixed to the outer wall of the welding machine body. The base shaft is rotatably connected to the suspension. The suspension is provided with inclined reinforcing ribs, and the two ends of the reinforcing ribs are fixed to the suspension and the outer wall of the welding machine body, respectively.

[0016] The present invention also discloses a welding method for processing filter stirring blades, which uses the aforementioned laser welding device.

[0017] Compared with the prior art, the present invention provides a laser welding device and a welding method for processing filter stirring blades, which has the following beneficial effects:

[0018] 1. This laser welding device and welding method for processing filter stirring blades utilizes a fixture, a drive assembly, and a positioning assembly. The fixture secures the blade bushing, and the positioning assembly positions the blades, facilitating precise alignment of the blades with the bushing and subsequent spot welding for pre-fixation. Furthermore, the drive assembly allows the bushing to rotate at equal angles, enabling precise spot welding of each blade sequentially. This improves welding accuracy, processing quality, and stability during use. Additionally, the drive assembly enables subsequent control of the blades to perform helical compound motion, eliminating the need for frequent hand-held welding torch movement by the operator, simplifying operation, reducing the risk of welding quality degradation due to operational errors, and further enhancing processing quality.

[0019] 2. This laser welding device and welding method for processing filter stirring blades, by setting a positioning component, can adjust the lateral position of the main positioning rod and the secondary positioning rod by rotating the secondary nut, and can adjust the longitudinal position of the main positioning rod and the secondary positioning rod by rotating the fastening bolt. This is beneficial to changing the initial position of the notch, so that the notch can match blades of different specifications, thus improving applicability.

[0020] 3. This laser welding device and welding method for processing filter stirring blades use a limiting pin and a limiting groove to engage the slide rail. After the blades are positioned and pre-fixed by spot welding, the limiting pin is pulled to move it out of the limiting groove. Then the slide rail is rotated so that it swings around the axis of rotation, thereby realizing the storage of the entire positioning component and avoiding interference with the subsequent full welding work. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the laser welding device of the present invention. Figure 1 ;

[0022] Figure 2 This is a three-dimensional structural diagram of the laser welding device of the present invention. Figure 2 ;

[0023] Figure 3 This is a top view of the laser welding apparatus of the present invention;

[0024] Figure 4 For the present invention Figure 3 Enlarged view of part A;

[0025] Figure 5 This is a cross-sectional view of the base shaft and hollow shaft of the present invention;

[0026] Figure 6 For the present invention Figure 5 Enlarged view of part B;

[0027] Figure 7 This is a cross-sectional view of the main body of the welding machine of the present invention;

[0028] Figure 8 This is a schematic diagram of the operation of the laser welding device of the present invention;

[0029] Figure 9 This is a schematic diagram of the installation structure of the secondary positioning rod of the present invention;

[0030] Figure 10 For the present invention Figure 9 Enlarged view of part D.

[0031] In the diagram: 1. Welding machine body; 2. Mounting frame; 21. Suspension; 22. Reinforcing rib; 3. Clamp; 31. Hollow shaft; 32. Strip hole; 33. First double-acting screw; 34. Nut seat; 35. Main screw cap; 36. Strip plate; 37. Clamping block; 38. Support rod; 4. Positioning assembly; 41. Main positioning rod; 42. Secondary positioning rod; 43. Notch; 44. Slide rail; 45. Second double-acting screw; 46. Secondary screw cap; 4 7. Slider; 48. Limiting block; 49. Adjusting bolt; 410. Channel; 411. Linear hole; 412. Fastening bolt; 5. Drive assembly; 51. Base shaft; 52. Drive motor; 53. Driven gear; 54. Drive gear; 55. Gear block; 56. Positioning protrusion; 57. Circular groove; 58. Push motor; 59. Push screw; 510. Threaded sleeve; 6. Limiting groove; 7. Limiting pin; 8. Return spring. Detailed Implementation

[0032] 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.

[0033] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a laser welding device and a welding method for processing filter stirring blades.

[0034] Example 1: Please refer to Figures 1-4 A laser welding device includes a welding machine body 1. A mounting frame 2 is fixed to one side of the welding machine body 1. A clamp 3 and a positioning component 4 are mounted on the mounting frame 2. The clamp 3 includes a hollow shaft 31 that can pass through the inner cavity of the blade bushing. The clamp 3 is used to clamp the blade bushing. The positioning component 4 includes a main positioning rod 41 and a secondary positioning rod 42 disposed above the clamp 3. The opposite edges of the main positioning rod 41 and the secondary positioning rod 42 are provided with notches 43 for positioning the blade. A drive component 5 is also mounted on the mounting frame 2. The drive component 5 is used to drive the clamp 3 to rotate at equal angles and to drive the clamp 3 to move axially.

[0035] Before processing, the fixture 3 moves to fix the blade bushing, the positioning component 4 positions the blade, the welding machine body 1 moves to spot weld and pre-fix a single blade, and the drive component 5 moves to force the fixture 3 to rotate at equal angles, thereby positioning and pre-fixing the next blade in sequence.

[0036] During processing, the positioning component 4 operates, forcing the fixture 3 to rotate and move axially, which in turn forces the blade to move along the welding trajectory, thereby reducing welding operation movements.

[0037] The welding machine body 1 is based on existing technology, including a housing and a welding torch connected to it. A hollow shaft 31 is horizontally positioned. During use, the blade bushing is placed on the clamp 3. After the clamp 3 rotates, it fixes the blade bushing. Then, the blade is inserted from top to bottom, so that the edges of the blade are respectively located in the notches 43 on the main positioning rod 41 and the auxiliary positioning rod 42. Finally, the bottom end of the blade is in contact with the surface of the blade bushing. Then, spot welding is performed using the welding torch for pre-fixation. Afterwards, the drive assembly 5 is activated, causing the clamp 3 to rotate. When the fixture 3 rotates at a certain angle, it drives the blade bushing to rotate at a certain angle. The next blade is spot-welded and fixed in the same way. After multiple blades are spot-welded and fixed, the welding gun is used to fully weld the connection between the blade and the blade bushing. At this time, the drive component 5 is started again. The drive component 5 makes the fixture 3 rotate and also drives the fixture 3 to move along the axial direction, forming a spiral compound motion. When welding, the welding gun is aligned with the connection part. There is no need to continuously move the welding gun, which reduces the operation. The blade welding work can be achieved by repeating the above full welding operation.

[0038] By setting up a fixture 3, a drive component 5, and a positioning component 4, the fixture 3 is used to fix the blade bushing, and then the positioning component 4 is used to position the blade. This facilitates the precise alignment of the blade with the blade bushing and the spot welding pre-fixation. Furthermore, the drive component 5 can drive the bushing to rotate at equal angles, which facilitates the precise spot welding pre-fixation of each blade in sequence. This improves the welding accuracy and processing quality of the blades, and ensures the stability of the blades during use. In addition, the drive component 5 can also control the blades to perform helical compound motion in the subsequent operation, eliminating the need for operators to frequently move the welding torch. This simplifies the operation, reduces the possibility of welding quality degradation due to operational errors, and further improves the processing quality.

[0039] Example 2: See Figures 4-6 Unlike the above embodiments, the hollow shaft 31 has multiple annular arrayed strip holes 32 on its outer wall. The clamp 3 also includes a first bidirectional screw 33 disposed inside the hollow shaft 31. Both ends of the first bidirectional screw 33 are rotatably connected to the hollow shaft 31. Two nut seats 34 are threaded onto the first bidirectional screw 33. Strip plates 36 are inserted into each of the multiple strip holes 32. A clamping block 37 is fixed to the outer edge of the strip plate 36. The inner edge of the strip plate 36 is connected to the two nut seats 34 respectively through two support rods 38. Both ends of the support rods 38 are hinged to the nut seats 34 and the strip plate 36 respectively. One end of the first bidirectional screw 33 extends to the outside of the hollow shaft 31 and is fixed with a main screw cap 35.

[0040] The central axis of the first bidirectional screw 33 coincides with the central axis of the hollow shaft 31. The first bidirectional screw 33 is provided with two sets of symmetrical threads with opposite directions of rotation. Two nut seats 34 are symmetrically arranged and matched with the two sets of threads respectively. In use, the blade bushing is sleeved on the hollow shaft 31. At this time, multiple clamping blocks 37 are located inside the blade bushing. Rotating the main screw cap 35 causes the first bidirectional screw 33 to rotate. When the first bidirectional screw 33 rotates, it causes the two nut seats 34 to move simultaneously to the middle of the first bidirectional screw 33, which in turn causes the ends of the two support rods 38 to move. When the ends of the support rods 38 move, they push the strip plate 36, causing the strip plate 36 to move to the outside of the strip hole 32, which causes the clamping blocks 37 to move to the outside of the hollow shaft 31. At this time, multiple clamping blocks 37 move synchronously and finally stick tightly to the inner wall of the blade bushing, thereby fixing the blade bushing. Similarly, rotating the main screw cap 35 in the opposite direction can achieve disassembly.

[0041] By setting the clamp 3, the blade bushing can be fixed by placing it on the hollow shaft 31 and then rotating the main rotating cap 35 at the end of the hollow shaft 31. This improves the stability of the blade bushing before and after welding and facilitates the subsequent positioning and welding of the blade and bushing.

[0042] Example 3, see Figures 3-7 Unlike the above embodiments, the drive assembly 5 includes a base shaft 51 and a drive motor 52. The clamp 3 is installed at the end of the base shaft 51. One end of the base shaft 51 is rotatably connected to the mounting bracket 2, and the other end of the base shaft 51 passes through the side wall of the welding machine body 1 and is rotatably connected to the side wall of the welding machine body 1. A driven gear 53 is fixed at one end of the base shaft 51 inside the welding machine body 1. The drive motor 52 is fixed on the welding machine body 1. A drive gear 54 is fixed on the output shaft of the drive motor 52. The drive gear 54 meshes with the driven gear 53. The driven gear 53 has multiple sets of staggered tooth blocks 55 and positioning protrusions 56 on its edge. The outer edge of the positioning protrusion 56 is set as an inwardly concave arc. The drive gear 54 is set as an incomplete gear. The round edge of the incomplete gear matches the shape of the outer edge of the positioning protrusion.

[0043] Taking a propeller with three blades as an example, three sets of tooth blocks 55 and positioning protrusions 56 are set. In use, after one propeller blade is installed on the propeller bushing, the drive motor 52 is started. The drive motor 52 drives the drive gear 54 to rotate. When the drive gear 54 rotates, it contacts the tooth block 55 on the driven gear 53, causing the driven gear 53 to rotate. When the driven gear 53 rotates, it drives the clamp 3 to rotate, causing the bushing on the clamp 3 to rotate. When the driven gear 53 rotates 120 degrees, the propeller bushing also rotates 120 degrees. At this time, the drive gear 54 disengages from the tooth block 55 on the driven gear 53 and engages with the positioning protrusions 56 on the driven gear 53, thus locking the driven gear 53 and keeping it at that angle. The propeller bushing is also stabilized, and then another propeller blade can be installed on the propeller bushing.

[0044] By setting the drive component 5, when the drive motor 52 is started, it can drive the base shaft 51 to rotate intermittently at equal angles. This helps to keep the bushing stable after rotating at equal angles, making it easier to align the blades evenly and accurately with the blade bushing, avoiding the accuracy error caused by manual positioning, and improving the welding quality.

[0045] Example 4, see Figure 5 Unlike the above embodiments, the base shaft 51 has a circular groove 57 at its end, a push motor 58 is fixedly connected in the circular groove 57, a push screw 59 is fixedly connected to the output shaft of the push motor 58, a threaded sleeve 510 is threadedly connected to the push screw 59, the threaded sleeve 510 is slidably connected to the inner cavity of the circular groove 57, and one end of the threaded sleeve 510 extends to the outside of the circular groove 57 and is fixedly connected to the end of the hollow shaft 31.

[0046] In this process, after the blades are pre-fixed by electric welding, the connection between the blades and the blade bushing is fully welded. At this time, the drive motor 52 and the push motor 58 are started simultaneously. When the drive motor 52 runs, it drives the bushing to rotate. When the push motor 58 runs, it drives the push screw 59 to rotate. When the push screw 59 rotates, it drives the threaded sleeve 510 to move outward from the circular groove 57, which in turn drives the clamp 3 and the blade to move axially. At this time, the blades form a compound motion, and the motion trajectory matches the welding trajectory. Therefore, the welding torch does not need to follow the welding trajectory during welding, which simplifies the operation, lowers the technical requirements, reduces the probability of welding errors, and ensures the welding quality.

[0047] Example 5, see Figures 8-10Unlike the above embodiments, the positioning component 4 includes a slide rail 44, one end of which is mounted on the mounting bracket 2. A second bidirectional screw 45 is provided inside the slide rail 44, with both ends of the second bidirectional screw 45 rotatably connected to the slide rail 44. One end of the second bidirectional screw 45 extends to the outside of the slide rail 44 and is fixed with a secondary screw cap 46. Two sliders 47 are slidably connected inside the slide rail 44, and both sliders 47 are threadedly connected to the second bidirectional screw 45. The main positioning rod 41 and the secondary positioning rod 42 are respectively mounted on the tops of the two sliders 47. Two limiting blocks 48 are provided between the two sliders 47. The limiting blocks 48 are slidably connected to the slide rail 44. Adjusting bolts 49 are installed on the edge of the limiting blocks 48. The bottom end of the adjusting bolts 49 abuts against the surface of the slide rail 44. The top of the sliders 47 is provided with a channel 410. The main positioning rod 41 and the auxiliary positioning rod 42 are respectively inserted into the channel 410 on the two sliders 47. The main positioning rod 41 and the auxiliary positioning rod 42 are both provided with linear holes 411. The main positioning rod 41 and the auxiliary positioning rod 42 are both fixed to the sliders 47 by fastening bolts 412.

[0048] The second bidirectional screw 45 has two sets of threads with opposite and symmetrical directions. Two sliders 47 are respectively matched with the two sets of threads. The fastening bolt 412 passes through the linear hole 411 and is threadedly connected to the slider 47, thus fixing the main positioning rod 41 and the auxiliary positioning rod 42. The groove 410 has the same width as the main positioning rod 41 and the auxiliary positioning rod 42, serving as a guide for them. In use, the blades are tilted and inserted from top to bottom between the main positioning rod 41 and the auxiliary positioning rod 42. The two edges of the blades are aligned with the notches 43 on the main positioning rod 41 and the auxiliary positioning rod 42, until the blades are in contact with the surface of the blade bushing, thus achieving positioning. Then... Spot welding is used for pre-fixation. Then, the secondary nut 46 is rotated, which drives the second bidirectional screw 45 to rotate, driving the two sliders 47 to move in the opposite direction. This causes the main positioning rod 41 and the secondary positioning rod 42 to disengage from the blade. Then, the bushing can be rotated to position and weld the next blade. Rotating the secondary nut 46 in the opposite direction drives the slider 47 to move until it contacts the limit block 48, thus resetting the main positioning rod 41 and the secondary positioning rod 42. In addition, rotating the secondary nut 46 can also adjust the lateral position of the main positioning rod 41 and the secondary positioning rod 42. Rotating the fastening bolt 412 can adjust the longitudinal position of the main positioning rod 41 and the secondary positioning rod 42, which is beneficial for adjusting the initial position of the notch 43 and can meet the welding requirements of different blades.

[0049] By setting the positioning component 4, the notches 43 on the main positioning rod 41 and the auxiliary positioning rod 42 are used to position the edge of the propeller blade, ensuring the stability of the angle and position of the propeller blade and improving the welding quality. Rotating the auxiliary nut 46 can adjust the lateral position of the main positioning rod 41 and the auxiliary positioning rod 42, and rotating the fastening bolt 412 can adjust the longitudinal position of the main positioning rod 41 and the auxiliary positioning rod 42, which is beneficial to changing the initial position of the notch 43, so that the notch 43 can match propeller blades of different specifications, thus improving applicability.

[0050] Example 6, see Figure 9 Unlike the above embodiments, one end of the slide rail 44 is rotatably connected to the mounting bracket 2 via a rotating shaft. The surface of the mounting bracket 2 is also provided with a limiting groove 6. A limiting pin 7 is also movably inserted into the slide rail 44. The bottom end of the limiting pin 7 is inserted into the limiting groove 6. A return spring 8 is fixedly connected between the top end of the limiting pin 7 and the slide rail 44. The return spring 8 is sleeved on the outside of the limiting pin 7.

[0051] The sliding rail 44 is kept stable by the interlocking action of the limiting pin 7 and the limiting groove 6. After the blade is positioned and pre-fixed by spot welding, the limiting pin 7 is pulled to move it out of the limiting groove 6. Then the sliding rail 44 is rotated so that it swings around the axis of rotation, thereby realizing the storage of the entire positioning component 4 and avoiding interference with the subsequent full welding work.

[0052] Example 7, see Figure 9 Unlike the above embodiments, the mounting frame 2 includes a horizontally arranged suspension 21, which is fixed to the outer wall of the welding machine body 1. The base shaft 51 is rotatably connected to the suspension 21. The suspension 21 is provided with an inclined reinforcing rib 22, and the two ends of the reinforcing rib 22 are fixed to the suspension 21 and the outer wall of the welding machine body 1, respectively.

[0053] Among them, the reinforcing rib 22 can improve the structural strength of the suspension 21 and improve the support effect of the suspension 21 on the base shaft 51.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A laser welding apparatus, comprising a welding machine body, characterized in that: A mounting frame is fixed to one side of the welding machine body. A clamp and a positioning assembly are mounted on the mounting frame. The clamp includes a hollow shaft that can pass through the inner cavity of the blade bushing. The clamp is used to hold the blade bushing. The positioning assembly includes a main positioning rod and a secondary positioning rod disposed above the clamp. The opposite edges of the main positioning rod and the secondary positioning rod are provided with notches for positioning the blades. A drive assembly is also mounted on the mounting frame. The drive assembly is used to drive the clamp to rotate at equal angles and to drive the clamp to move axially. Before processing, the fixture moves to fix the blade bushing, the positioning component positions the blade, the welding machine body moves to spot weld and pre-fix a single blade, and the drive component moves to force the fixture to rotate at the same angle, thereby positioning and pre-fixing the next blade in sequence. During processing, the positioning component operates, forcing the fixture to rotate and move axially at the same time, which in turn forces the blades to move along the welding trajectory, thereby reducing welding operation movements. The positioning component includes a slide rail, one end of which is mounted on a mounting bracket. A second bidirectional screw is provided inside the slide rail, both ends of which are rotatably connected to the slide rail. One end of the second bidirectional screw extends to the outside of the slide rail and is fixed with a secondary screw cap. Two sliders are slidably connected inside the slide rail, and both sliders are threadedly connected to the second bidirectional screw. A main positioning rod and a secondary positioning rod are respectively mounted on the top of the two sliders. Two limiting blocks are provided between the two sliders. The limiting blocks are slidably connected to the slide rail. Adjusting bolts are installed on the edges of the limiting blocks, and the bottom ends of the adjusting bolts abut against the surface of the slide rail. The top of the slider is provided with a channel, and the main positioning rod and the auxiliary positioning rod are respectively inserted into the channels on the two sliders. The main positioning rod and the auxiliary positioning rod are provided with linear holes. The main positioning rod and the auxiliary positioning rod are fixed to the slider by fastening bolts. One end of the slide rail is rotatably connected to the mounting bracket via a rotating shaft. The surface of the mounting bracket is also provided with a limiting groove. A limiting pin is also movably inserted into the slide rail. The bottom end of the limiting pin is inserted into the limiting groove. A return spring is fixedly connected between the top end of the limiting pin and the slide rail. The return spring is sleeved outside the limiting pin.

2. The laser welding apparatus according to claim 1, characterized in that: The hollow shaft has multiple annular arrayed strip holes on its outer wall. The clamp also includes a first bidirectional screw inside the hollow shaft. Both ends of the first bidirectional screw are rotatably connected to the hollow shaft. Two nut seats are threaded onto the first bidirectional screw. Strip plates are inserted into each of the multiple strip holes. Clamping blocks are fixed to the outer edges of the strip plates. The inner edges of the strip plates are connected to the two nut seats via two support rods. The two ends of the support rods are hinged to the nut seats and the strip plates, respectively. One end of the first bidirectional screw extends to the outside of the hollow shaft and is fixed with a main screw cap.

3. The laser welding apparatus according to claim 1, characterized in that: The drive assembly includes a base shaft and a drive motor. The clamp is installed at the end of the base shaft. One end of the base shaft is rotatably connected to the mounting bracket. The other end of the base shaft passes through the side wall of the welding machine body and is rotatably connected to the side wall of the welding machine body. A driven gear is fixed at one end of the base shaft inside the welding machine body. The drive motor is fixed on the welding machine body. A driving gear is fixed on the output shaft of the drive motor. The driving gear meshes with the driven gear.

4. The laser welding apparatus according to claim 3, characterized in that: The driven gear has multiple sets of staggered tooth blocks and positioning protrusions on its edge. The outer edge of the positioning protrusion is set as an inwardly concave arc. The driving gear is set as an incomplete gear. The round edge of the incomplete gear matches the shape of the outer edge of the positioning protrusion.

5. A laser welding apparatus according to claim 3, characterized in that: A circular groove is provided at the end of the base shaft. A push motor is fixedly connected in the circular groove. A push screw is fixed on the output shaft of the push motor. A threaded sleeve is threadedly connected to the push screw. The threaded sleeve is slidably connected to the inner cavity of the circular groove. One end of the threaded sleeve extends to the outside of the circular groove and is fixedly connected to the end of the hollow shaft.

6. The laser welding apparatus according to claim 3, characterized in that: The mounting frame includes a horizontally arranged suspension, which is fixed to the outer wall of the welding machine body. The base shaft is rotatably connected to the suspension. The suspension is provided with inclined reinforcing ribs, and the two ends of the reinforcing ribs are fixed to the suspension and the outer wall of the welding machine body, respectively.

7. A welding method for processing filter stirring impeller blades, characterized in that: This welding method for processing filter stirring blades uses a laser welding apparatus as described in any one of claims 1-6.

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