Automatic welding device for stirrer blade

Abstract

The invention relates to the technical field of stirrer blade machining, and discloses a stirrer blade automatic welding device which comprises a rack, a welding cabin is arranged on one side of the rack, and a rotating table used for bearing a roller shaft is arranged in the welding cabin; a conveying mechanism extending in the radial direction of the welding cabin is arranged on the outer side of the rack, and a carrying system is carried on the conveying mechanism; a welding system is mounted on the top wall of the rack; a transmission sliding block assembly moving along with the conveying mechanism is arranged beside the conveying mechanism, the transmission sliding block assembly is in sliding fit with a swing driving mechanism in the rack, and the swing driving mechanism is driven to rotate in the feeding or returning process so that meshing transmission between the transmission sliding block assembly and the rotating table can be relieved or established, and automatic quantitative rotation of the roll shaft welding face can be achieved. Automatic loading, transportation, alignment and welding processes are controlled through a program, automatic transposition of a welding surface is completed in combination with an engagement and disengagement mechanism, and the welding efficiency and the positioning precision are remarkably improved; and the device can be flexibly adapted to blades and roll shafts of various specifications, and the multi-specification batch production requirement is met.

Description

Technical Field

[0001] This invention relates to the field of mixer blade processing technology, and more specifically to an automatic welding device for mixer blades. Background Technology

[0002] As a core component of mixing equipment, mixer blades come in various structural forms. Depending on the mixing process and application scenario, common types include propeller, turbine, paddle, anchor, ribbon, and folding blade structures. These types of mixer blades typically employ a structure where the blades are welded equidistantly to the sidewall of the mixer roller along its circumference. In traditional mixer blade welding processes, each blade assembly is usually placed and positioned manually before welding. However, this manual welding method is susceptible to variations in operator skill levels, leading to problems such as insufficient positioning accuracy and uneven arrangement of blade components, which in turn affects the overall assembly quality and performance of the mixer blades. To address the aforementioned issues, existing technologies have provided improved solutions. For example, patent document CN118371910B discloses an automatic welding device for blades of a paddle mixer. This device includes a base, a mounting ring rotatably connected to the base, and a welding torch positioned above the mounting ring. The center of the mounting ring is used to place the mixer blades to be welded, which consist of six sets of blades, a main plate, and a central shaft. The ring wall is circumferentially equipped with blade locking mechanisms, main plate locking mechanisms, and central shaft locking mechanisms, which are used to lock the positions of the blades, main plate, and central shaft, respectively, thereby achieving overall positioning and welding of each component and improving the efficiency and stability of the welding process to a certain extent.

[0003] However, the application scope of the aforementioned existing devices is relatively limited, mainly applicable to specific types of flat paddle mixer blades, and difficult to adapt to the production needs of diverse specifications and different types of mixer blades. In actual production, corresponding special welding equipment still needs to be configured for mixers with different structures, resulting in high equipment investment costs, which is not conducive to the economic efficiency of production lines under the multi-specification, small-batch production mode. Summary of the Invention

[0004] The technical problem to be solved by this invention is: how to solve the problem that the existing automatic welding device for mixer blades has a narrow application range and is difficult to adapt to the production needs of mixers with diverse specifications and types.

[0005] This invention provides the following technical solution: an automatic welding device for mixer blades, comprising a frame with a welding chamber on one side, a rotating table for supporting mixer rollers inside the welding chamber; a conveying mechanism extending radially along the welding chamber is provided on the outer wall of the frame, and a transport system for gripping mixer blades is mounted on the conveying mechanism. A mixer blade gripped by the transport system can be fed to the welding chamber side by the linear movement of the conveying mechanism; a welding system for welding the contact surface between the roller and the blade is installed on one side of the top wall of the frame; a transmission slider assembly is installed beside the conveying mechanism and moves with it and is horizontally inserted into the frame, and the transmission slider assembly slides in cooperation with a swing drive mechanism provided inside the frame. During the feeding or retraction of the transmission slider assembly, the swing drive mechanism is driven to rotate adaptively to release or establish the meshing transmission capability between the transmission slider assembly and the rotating table, thereby realizing the automatic and quantitative rotation of the roller welding surface by using the meshing and disengagement mechanism.

[0006] Furthermore, the rotary table includes a rotating frame rotatably installed in the welding chamber and a gear ring fixed to the bottom wall of the rotating frame; the rotating frame and the gear ring can rotate coaxially as a whole, and the bottom of the frame is provided with a transmission cavity for accommodating the gear ring, the transmission slider assembly and the swing drive mechanism and for their operation.

[0007] Furthermore, the rotating frame is a frame structure, with a support seat with a mesh screen in the middle of the rotating frame, which is used to receive the roller shaft and does not obstruct the discharge of welding slag; the inner diameter of the support seat should at least meet the diameter requirements of different specifications of roller shafts used in production, and the clamping mechanism should be used to stably constrain them within the support seat.

[0008] Furthermore, the transmission slider assembly includes a sliding arm capable of axial movement under the drive of the conveying mechanism. The sliding arm has a cavity, and its radial inner and outer walls are respectively provided with an inner groove and an outer groove communicating with the cavity. A transmission pin is slidably sleeved in the cavity. The outer contour of the transmission pin is T-shaped, and it is integrally formed by an axially extending pressure part and a contact part. A spring is sleeved on the contact part between the pressure part and the inner groove. When the spring is not compressed by external force, one side of the transmission pin extends out of the inner groove but does not contact the side teeth of the toothed ring.

[0009] Furthermore, the longitudinal width of the pressure-receiving part is greater than that of the outer groove, and the longitudinal width of the inner groove is adapted to the longitudinal width of the actuating part, so that when the transmission pin is subjected to radial thrust from the outer groove side, it will smoothly extend radially along the inner groove and approach the toothed ring.

[0010] Furthermore, the side of the actuating part of the transmission pin near the rotary table is configured with a toothed segment and toothless segments arranged to its left and right. The radial width difference between the toothed segment and the toothless segment is the peak distance of one tooth. When the transmission pin is radially pushed to the limit position, its toothed segment overlaps with the circle where the side teeth of the tooth ring are located, while the toothless segment does not contact the circle where the side teeth of the tooth ring are located.

[0011] Furthermore, the swing drive mechanism includes a linkage assembly with one end slidably connected to the sliding arm, and the other end of the linkage assembly is rotatably connected to the connecting end of the swing arm. The outer contour of the swing arm is approximately U-shaped, and its inflection point near the linkage assembly is rotatably mounted in the transmission cavity via a rotating shaft. The end of the swing arm away from the linkage assembly is the pressure end. By sliding the sliding arm to the left or right, the rotational swing direction of the swing arm can be changed, thereby releasing or applying the radial thrust on the transmission pin.

[0012] Furthermore, a guide block is fixed at the inflection point of the swing arm near the pressure end. The guide block is slidably engaged in the arc-shaped groove pre-set in the top wall of the transmission cavity. When one end of the connecting rod assembly is subjected to axial pushing force, the swing arm can rotate clockwise or counterclockwise around the pivot to push the pressure end toward or away from the transmission pin.

[0013] Furthermore, the linkage assembly includes a sliding pin that slidably engages with the sliding arm, with a telescopic rod hinged to one end of the sliding pin away from the sliding arm, and the other end of the telescopic rod hinged to the connecting end of the swing arm.

[0014] A welding process based on the aforementioned device includes the following steps: S1. Initial loading: Insert the mixer roller shaft into the rotary table and lock it in place with the positioning assembly; the conveying system clamps and conveys the mixer blades to complete the preparation before welding. S2, Blade Transportation: The conveying mechanism drives the handling system and the transmission slider assembly to transport the blades from right to left, so that the blades are fed into the welding chamber; the connecting rod assembly is pushed to the left by the sliding arm and pulls the swing arm connecting end to rotate clockwise around the rotating shaft. Its pressure end is removed from the motion trajectory when the transmission slider assembly is close to it, so as to avoid squeezing the transmission pin and prevent it from triggering the transmission when it passes by the toothed ring, so as to achieve the alignment and close proximity of the roller welding surface and the blade. S3, Alignment Welding: After the conveying system moves to the welding area, the conveying mechanism stops moving. The conveying system then places the clamped blade against the rightmost welding surface of the roller shaft, and works with the welding system to quickly weld the contact surface. S4, Reverse Start: The conveying mechanism drives the handling system and the transmission slider assembly to transport from left to right, and the unloaded handling system moves away from the welding chamber; the connecting rod assembly is pulled to the right by the sliding arm and pulls the swing arm connection end to rotate counterclockwise around the rotating shaft. When the pressure end of the transmission pin meshing section is close to the rotary table, it pushes it out to form a trajectory that overlaps with the circle where the toothed ring side teeth are located. S5, Reverse transmission: The conveying mechanism continues to drive the handling system and the transmission slider assembly to the right. The transmission pin is kept extended under the pressure of the swing arm. Its meshing section contacts the side teeth of the toothed ring and drives it to rotate clockwise. This adjusts the rotation of the roller shaft of the welded blade and realizes automatic repositioning of the welded surface. S6, Retraction and Reset: The transmission slider assembly continues to retract to the right. The toothed section of the transmission pin completely passes through the side teeth of the toothed ring to complete the preset angle transmission and then disengages. The toothless section intervenes to terminate the transmission, and the rotary table remains stationary at the rotated angle. Subsequently, the transmission pin disengages from the pressure end of the swing arm and elastically retracts into the sliding arm, completing the reset.

[0015] The technical effects and advantages of this invention are as follows: This invention achieves highly efficient automated welding of mixer blades through structural optimization and process integration. Its main technical advantages are: First, it employs a program-controlled automatic loading, transportation, alignment, and welding process. Combined with a conveyor mechanism, the automatic and quantitative rotation of the roller welding surface is achieved during the retraction process using an engagement and disengagement mechanism. This eliminates the need for additional drive to complete station repositioning, significantly improving welding efficiency and positioning accuracy. Second, the device can flexibly adapt to various types and sizes of mixer blades and rollers, breaking the limitations of traditional single-type equipment and meeting the batch production needs of multi-specification products. Third, the overall structure is compact, and the actions are continuous, reducing manual intervention, ensuring the stability and consistency of welding quality, and effectively reducing the equipment investment cost of the production line. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 For the present invention Figure 1 Schematic diagram of the cross-section structure.

[0018] Figure 3 For the present invention Figure 2 Schematic diagram of the structure in the initial loading stage.

[0019] Figure 4 For the present invention Figure 2 A schematic diagram of the structure during the blade transport stage.

[0020] Figure 5 For the present invention Figure 2 A schematic diagram of the structure in the alignment welding stage.

[0021] Figure 6 For the present invention Figure 2 A schematic diagram of the structure in the initial stage of regression.

[0022] Figure 7 For the present invention Figure 2 A schematic diagram of the structure in the retraction transmission stage.

[0023] Figure 8 For the present invention Figure 2 A schematic diagram of the structure in the retraction and reset phase.

[0024] Figure 9This is a schematic diagram of the frame, rotary table and positioning components of the present invention.

[0025] Figure 10 This is a schematic diagram of the frame and swing drive mechanism of the present invention.

[0026] Figure 11 This is a schematic diagram of the swing drive mechanism of the present invention.

[0027] Figure 12 This is a schematic diagram of the frame and transmission slider assembly of the present invention.

[0028] Figure 13 This is a schematic diagram of the transmission slider assembly of the present invention.

[0029] The attached figures are labeled as follows: 1. Frame; 11. Welding chamber; 12. Adjustment window; 13. Guide groove; 14. Transmission cavity; 15. Guide rail; 2. Conveying mechanism; 21. Slide; 22. Base rail; 3. Handling system; 4. Welding system; 5. Rotary table; 51. Rotating frame; 52. Gear ring; 6. Transmission slider assembly; 61. Sliding arm; 611. First slide groove; 612. Second slide groove; 62. Transmission pin; 63. Spring; 7. Swing drive mechanism; 71. Swing arm; 711. Main crank arm; 712. Pressure arm; 72. Linkage assembly; 721. Telescopic rod; 7211. Sleeve rod; 7212. Slide rod; 722. Sliding pin; 73. Rotating shaft; 74. Guide block; 8. Positioning assembly; 81. Telescopic bar; 82. Clamping plate. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The automatic welding device for mixer blades involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Combination Figures 1 to 13As shown, the present invention provides an automatic welding device for mixer blades, including a frame 1 with a welding chamber 11 on one side. A rotary table 5 for supporting mixer rollers is provided inside the welding chamber 11. A conveying mechanism 2 extending radially along the welding chamber 11 is provided on the outer wall of the frame 1. A conveying system 3 for clamping mixer blades is mounted on the conveying mechanism 2. A mixer blade clamped by the conveying system 3 can be fed to one side of the welding chamber 11 by the linear movement of the conveying mechanism 2. A welding system 4 for welding the contact surface between the roller and the blade is installed on one side of the top wall of the frame 1. A transmission slider assembly 6 is installed on the side of the conveying mechanism 2 and moves with it and is horizontally inserted into the frame 1. The transmission slider assembly 6 is slidably engaged with a swing drive mechanism 7 provided inside the frame 1. During the feeding or retraction of the transmission slider assembly 6, the swing drive mechanism 7 is driven to rotate adaptively to release or establish the meshing transmission capability between the transmission slider assembly 6 and the rotary table 5. The automatic and quantitative rotation of the roller welding surface is realized by the meshing and disengagement mechanism. The rotary table 5 includes a rotating frame 51 rotatably installed in the welding chamber 11 and a toothed ring 52 fixed to the bottom wall of the rotating frame 51; the rotating frame 51 and the toothed ring 52 can rotate coaxially as a whole, and the bottom of the frame 1 is provided with a transmission cavity 14 for accommodating the toothed ring 52, the transmission slider assembly 6 and the swing drive mechanism 7 and for their operation. The rotating frame 51 is a frame structure, which can prevent welding slag residue from accumulating on its surface and reduce the cleaning burden; the middle of the rotating frame 51 is provided with a support seat with a mesh screen, preferably a circular cylindrical structure, which is used to receive the roller shaft and does not obstruct the discharge of welding slag; the inner diameter of the support seat should at least meet the diameter requirements of different specifications of roller shafts used in production, and work with the clamping mechanism to stably constrain them in the support seat. The clamping mechanism is installed on the top of the rotating frame 51 and can be either electrically driven or manually adjusted. When using an electrically driven clamping mechanism, due to the limited length of the power transmission line, the number of rotations of the rotating table 5 needs to be reasonably controlled within the limit range. For example, the rotating table 5 can be manually returned to its initial position after one rotation to avoid the power transmission line winding and affecting the circumferential adjustment of the roller shaft and the blade welding task in the next cycle. The side wall of the frame 1 is provided with an adjustment window 12 for the operator to manually adjust the rotating table 5 for the reset process. If the manually adjusted clamping mechanism is used, there is no need to consider the power transmission line constraint, and the calibration and reset of the rotating table 5 after each welding task cycle can be eliminated. The electric drive clamping mechanism is preferably a positioning component 8, which includes at least two telescopic bars 81 fixedly installed on the top wall of the rotating frame 51. The telescopic shaft of the telescopic bar 81 moves through the side wall of the support seat and is fixedly connected to the clamping plate 82. The clamping plate 82 is arc-shaped, and the clamping and fixing of the roller shaft can be achieved by retracting or expanding the clamping plate 82. The transmission slider assembly 6 includes a sliding arm 61 that can move axially under the drive of the conveying mechanism 2. The sliding arm 61 has a cavity, and its radial inner and outer walls are respectively provided with an inner groove and an outer groove that communicate with the cavity. A transmission pin 62 is slidably sleeved in the cavity. The outer contour of the transmission pin 62 is T-shaped, and it is integrally formed by an axially extending pressure part and a contact part. A spring 63 is sleeved on the contact part between the pressure part and the inner groove. When the spring 63 is not compressed by external force, one side of the transmission pin 62 extends out of the inner groove but does not contact the side teeth of the toothed ring 52. The longitudinal width of the pressure-bearing part is greater than that of the outer groove, and the longitudinal width of the inner groove is adapted to the longitudinal width of the actuating part, so that when the transmission pin 62 is subjected to radial thrust from the side of the outer groove, it will smoothly extend radially along the inner groove and approach the toothed ring 52. The actuating part of the transmission pin 62 is provided with a toothed section on the side near the rotary table 5 and toothless sections arranged on its left and right sides. The difference in radial width between the toothed section and the toothless section is the peak distance of one tooth. When the transmission pin 62 is radially pushed to the limit position, its toothed section overlaps with the circle where the side teeth of the tooth ring 52 are located, while the toothless section does not contact the circle where the side teeth of the tooth ring 52 are located. The left and right sides of the transmission cavity 14 are provided with guide grooves 13 for the transmission slider assembly 6 to pass through and move. The bottom wall of the guide groove 13 is fixed with a guide rail 15. The bottom wall of the sliding arm 61 is provided with a second sliding groove 612 that slides with the guide rail 15 to ensure that the transmission pin 62 can move stably and linearly along the guide groove 13 without deviation when subjected to radial thrust. The swing drive mechanism 7 includes a linkage assembly 72 with one end slidably connected to the sliding arm 61, and the other end of the linkage assembly 72 rotatably connected to the connecting end of the swing arm 71. The outer contour of the swing arm 71 is approximately U-shaped, and its inflection point on the side near the linkage assembly 72 is rotatably mounted in the transmission cavity 14 via a rotating shaft 73. The end of the swing arm 71 away from the linkage assembly 72 is the pressure end. By sliding the sliding arm 61 to the left or right, the rotational swing direction of the swing arm 71 can be changed, thereby releasing or applying the radial thrust on the transmission pin 62. A guide block 74 is fixed at the inflection point of the swing arm 71 near the pressure end. The guide block 74 is slidably engaged in the arc-shaped groove preset in the top wall of the transmission cavity 14. When one end of the connecting rod assembly 72 is subjected to axial pushing force, the swing arm 71 can rotate clockwise or counterclockwise around the pivot 73 to push the pressure end toward or away from the transmission pin 62. The swing arm 71 includes an L-shaped main crank arm 711, with a rotating shaft 73 at the inflection point of the main crank arm 711. The other end of the main crank arm 711 extends axially and is fixed with a pressure arm 712 that is parallel to the branch of the main crank arm 711, thus forming a U-shaped outer contour and a double inflection point structure of the swing arm 71. The side of the pressure arm 712 near the rotary table 5 is provided with a pushing surface of a certain length, so that the swing arm 71 has a stable contact surface when it comes into contact with the transmission pin 62, ensuring the reliability and stability of the elastic extension and retraction of the transmission pin 62. The linkage assembly 72 includes a sliding pin 722 that slidably engages with the sliding arm 61. A telescopic rod 721 is hinged to one end of the sliding pin 722 away from the sliding arm 61, and the other end of the telescopic rod 721 is hinged to the connecting end of the swing arm 71. When the sliding arm 61 moves to the left or right, the sliding pin 722 can adaptively follow and slide within a predetermined range. The telescopic design of the telescopic rod 721 is used to compensate for the change in distance between the sliding pin 722 and the connecting end of the swing arm 71 when sliding horizontally. The sliding traction of the sliding pin 722 pulls the swing arm 71 to rotate around the axis. The length of the sliding arm 61 is set to ensure that it remains connected to the linkage assembly 72 during movement; the surface of the sliding arm 61 is provided with a first groove 611 that slides and engages with the sliding pin 722. The first groove 611 and the second groove 612 can be set to the same track to simplify the number of tracks. The telescopic rod 721 includes a sleeve rod 7211 hinged to the connecting end of the swing arm 71. A sliding rod 7212 is slidably nested inside the sleeve rod 7211. The extended end of the sliding rod 7212 is hinged to the sliding pin 722. When the sliding pin 722 slides horizontally to one side to its limit position, the displacement of the sliding rod 7212 extending out of the sleeve rod 7211 reaches its maximum value, thereby driving the swing arm 71 to rotate to its limit angle. The handling system 3 is a robotic arm equipped with an electric gripper, and the welding system 4 is a robotic arm equipped with a welding device. Their specific structures and control methods are conventional technologies in this field and will not be described in detail here. The conveying mechanism 2 includes a base rail 22 fixedly installed on the ground and a slide block 21 slidably mounted thereon. The side of the slide block 21 away from the frame 1 is equipped with a drive device to drive the slide block 21 to move linearly along the base rail 22.

[0032] Working principle of the device: Initial loading: The roller shaft of the mixer is inserted vertically into the positioning center of the rotary table 5 by the roller feeding mechanism or manually, and the bottom section of the roller shaft is locked by adjusting the positioning component 8 to achieve fixed clamping; the conveying system 3 clamps a mixer blade from the delivery or storage area through program control, and the parts to be welded are ready to be in place; Blade transport: Under the push of the drive device, the slide 21 drives the conveying system 3 and the transmission slider assembly 6 to transport from right to left along the base rail 22, so that the mixer blades held by the conveying system 3 move closer to the welding chamber 11 for feeding; at the same time, the transmission slider assembly 6 is linearly inserted along the guide groove 13, causing the connecting rod assembly 72 to be pushed to the left by the sliding arm 61 and pull the connecting end of the swing arm 71 to rotate clockwise around the rotating shaft 73. The pressure end of the swing arm 71 has already left its movement trajectory when the transmission slider assembly 6 approaches, ensuring that there is no squeezing between the transmission pin 62 and the swing arm 71. At this time, the transmission pin 62 is stably retracted in the sliding arm 61 under the support of the spring 63, so that it does not trigger the transmission relationship when passing by the side of the toothed ring 52, so that the rotary table 5 remains static, realizing the alignment and close proximity of the roller welding surface and the blade; Alignment welding: When the conveying system 3 transports the blade to the welding area, the slide 21 stops moving. The conveying system 3, through program control, brings the blade it grips against the welding surface on the far right of the roller shaft, and works with the welding system 4 to quickly weld the contact surface. This completes the welding operation of one blade of the mixer onto the roller. Retraction Start: Under the pullback of the drive device, the slide 21 drives the transport system 3 and the transmission slider assembly 6 to be transported from left to right along the base rail 22, so that the unloaded transport system 3 begins to move away from the welding chamber 11; at the same time, the transmission slider assembly 6 is linearly pulled out along the guide groove 13, causing the connecting rod assembly 72 to be pulled to the right by the sliding arm 61 to pull the connecting end of the swing arm 71 to rotate counterclockwise around the rotating shaft 73. When the pressure end of the swing arm 71 is close to the rotating table 5, the transmission pin 62 has been pushed out to overlap with the trajectory of the side teeth of the toothed ring 52, so as to establish the transmission with the rotating table 5 when the transmission slider assembly 6 continues to retract to the right with the slide 21. Retraction transmission: Under the pullback of the drive device, the slide 21 drives the conveying system 3 and the transmission slider assembly 6 to continue to convey to the right along the base rail 22. The transmission pin 62 maintains a constant extension under the pressure of the pressure end of the swing arm 71. Its meshing section contacts the side teeth of the toothed ring 52 and drives it to rotate clockwise to adjust the rotation of the roller shaft with a blade welded on it, realize the automatic replacement of the welding surface of the roller shaft, and facilitate the welding of the next blade on its side wall. Retraction and Reset: As the transmission slider assembly 6 continues to retract to the right, the toothed section of the transmission pin 62 completely passes through the side teeth of the toothed ring 52 and completes the preset angle transmission before disengaging. The toothless section then intervenes, and the transmission terminates because the toothless section does not contact the toothed ring 52. At this time, the transmission slider assembly 6 continues to move to the right without driving the rotary table 5. The rotary table 5 remains stationary at the already rotated angle, completing the repositioning of the roller welding surface. Subsequently, the transmission pin 62 disengages from the pressure end of the swing arm 71 and retracts back into the sliding arm 61 under the elastic force of the spring 63. Finally, the slide block 21 carries the transmission slider assembly 6 and the conveying system 3 back to the initial position. Repeating the above operations will weld the blades to the side wall of the mixer roller at equal intervals along its circumference, improving welding efficiency and quality. The specifications and types of mixer blades or rollers can be changed according to actual production needs to meet the requirements of multi-specification batch production mode.

[0033] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, in accordance with the technical plan and improved concept of the present invention, should be included under the protection of the present invention.

Claims

1. An automatic welding device for mixer blades, characterized in that, The machine includes a frame (1), with a welding chamber (11) on one side. A rotary table (5) for carrying the mixer roller shaft is installed inside the welding chamber (11). A conveying mechanism (2) extending radially along the welding chamber (11) is provided on the outer wall of the frame (1). A conveying system (3) for clamping the mixer blade is mounted on the conveying mechanism (2). A mixer blade clamped by the conveying system (3) can be fed to the side of the welding chamber (11) by the linear movement of the conveying mechanism (2). A conveying system for connecting the roller shaft and the blade is installed on one side of the top wall of the frame (1). A welding system (4) for welding the contact surface; a transmission slider assembly (6) is installed on the side of the conveying mechanism (2) and is horizontally inserted into the frame (1) as it moves. The transmission slider assembly (6) is slidably engaged with the swing drive mechanism (7) set in the frame (1). During the feeding or retraction of the transmission slider assembly (6), the swing drive mechanism (7) is driven to rotate adaptively to release or establish the meshing transmission capability between the transmission slider assembly (6) and the rotary table (5). The automatic and quantitative rotation of the roller welding surface is realized by using the meshing and disengagement mechanism.

2. The apparatus of claim 1, wherein, The rotary table (5) includes a rotating frame (51) rotatably installed in the welding chamber (11) and a toothed ring (52) fixed to the bottom wall of the rotating frame (51); the rotating frame (51) and the toothed ring (52) can rotate coaxially as a whole, and the bottom of the frame (1) is provided with a transmission cavity (14) for accommodating the toothed ring (52), the transmission slider assembly (6) and the swing drive mechanism (7) and for their operation.

3. The apparatus of claim 2, wherein, The rotating frame (51) is a frame structure. A support seat with a mesh screen is provided in the middle of the rotating frame (51) to receive the roller shaft and not obstruct the discharge of welding slag. The inner diameter of the support seat should at least meet the diameter requirements of different specifications of roller shafts used in production, and the clamping mechanism should be used to stably constrain them in the support seat.

4. The apparatus of claim 2, wherein, The transmission slider assembly (6) includes a sliding arm (61) that can move axially under the drive of the conveying mechanism (2). The sliding arm (61) has a cavity, and its radial inner and outer walls are respectively provided with an inner groove and an outer groove that communicate with the cavity. A transmission pin (62) is slidably sleeved in the cavity. The outer contour of the transmission pin (62) is T-shaped, and it is integrally formed by an axially extended pressure part and a triggering part. A spring (63) is sleeved on the triggering part between the pressure part and the inner groove. When the spring (63) is not compressed by external force, one side of the transmission pin (62) extends out of the inner groove but does not contact the side teeth of the toothed ring (52).

5. The apparatus according to claim 4, characterized in that, The longitudinal width of the pressure-bearing part is greater than that of the outer groove, and the longitudinal width of the inner groove is adapted to that of the actuating part, so that when the transmission pin (62) is subjected to radial thrust from the side of the outer groove, it will extend smoothly radially along the inner groove and approach the toothed ring (52).

6. The apparatus of claim 5, wherein, The contact part of the transmission pin (62) is provided with a toothed section and a toothless section arranged on its left and right sides near the rotating table (5). The radial width difference between the toothed section and the toothless section is the peak distance of one tooth. When the transmission pin (62) is radially pushed to the limit position, its toothed section overlaps with the circle of the side teeth of the tooth ring (52), while the toothless section does not contact the circle of the side teeth of the tooth ring (52).

7. The apparatus of claim 6, wherein, The swing drive mechanism (7) includes a link assembly (72) with one end slidably connected to the sliding arm (61), and the other end of the link assembly (72) is rotatably connected to the connecting end of the swing arm (71). The outer contour of the swing arm (71) is approximately U-shaped. The inflection point on the side near the link assembly (72) is rotatably mounted in the transmission cavity (14) via the rotating shaft (73), and the end of the swing arm (71) away from the link assembly (72) is the pressure end. By sliding the sliding arm (61) to the left or right, the rotation direction of the swing arm (71) can be changed, thereby releasing or applying the radial thrust on the transmission pin (62).

8. The apparatus of claim 7, wherein, A guide block (74) is fixed at the inflection point of the swing arm (71) near the pressure end. The guide block (74) is slidably engaged in the arc-shaped groove pre-set in the top wall of the transmission cavity (14). When one end of the connecting rod assembly (72) is subjected to axial pushing force, the swing arm (71) can rotate clockwise or counterclockwise around the pivot (73) to push the pressure end toward or away from the transmission pin (62).

9. The apparatus of claim 8, wherein, The linkage assembly (72) includes a sliding pin (722) that slides and engages with the sliding arm (61). One end of the sliding pin (722) away from the sliding arm (61) is hinged to a telescopic rod (721), and the other end of the telescopic rod (721) is hinged to the connecting end of the swing arm (71).

10. A welding process based on the apparatus of claim 9, characterized in that, Includes the following steps: S1. Initial loading: Insert the mixer roller shaft into the rotary table (5) and lock it in place with the positioning assembly (8); the transport system (3) clamps and transports the mixer blades to complete the preparation before welding; S2, Blade transport: The conveying mechanism (2) drives the handling system (3) and the transmission slider assembly (6) to transport from right to left, so that the blades are fed into the welding chamber (11); the connecting rod assembly (72) is pushed to the left by the sliding arm (61) to pull the connecting end of the swing arm (71) and rotates clockwise with the rotating shaft (73) as the center. Its pressure end is removed from the motion trajectory when the transmission slider assembly (6) is close to it, so as to avoid squeezing the transmission pin (62) and so that it does not trigger the transmission when it passes the side of the toothed ring (52), so as to realize the alignment and close proximity of the roller welding surface and the blade; S3, Alignment Welding: After the conveying system (3) transports the blade to the welding area, the conveying mechanism (2) stops moving. The conveying system (3) then places the blade against the rightmost welding surface of the roller shaft and works with the welding system (4) to quickly weld the contact surface. S4, Reverse Start: The conveying mechanism (2) drives the transport system (3) and the transmission slider assembly (6) to transport from left to right. The unloaded transport system (3) moves away from the welding chamber (11). The connecting rod assembly (72) is pulled to the right by the sliding arm (61) to pull the connecting end of the swing arm (71) and rotates counterclockwise around the rotating shaft (73). When the pressure end of the transmission pin (62) is close to the rotating table (5), it pushes it out to form a trajectory that overlaps with the circle where the side teeth of the toothed ring (52) are located. S5, Reverse transmission: The conveying mechanism (2) continues to drive the conveying system (3) and the transmission slider assembly (6) to the right. The transmission pin (62) is kept extended under the pressure of the swing arm (71). Its meshing section contacts the side teeth of the toothed ring (52) and drives it to rotate clockwise. The roller shaft of the welded blade is adjusted to rotate, and the welding surface is automatically changed. S6, Retraction and Reset: The transmission slider assembly (6) continues to retract to the right. The toothed section of the transmission pin (62) completely passes through the side teeth of the toothed ring (52) to complete the preset angle transmission and then disengages. The toothless section intervenes to terminate the transmission, and the rotary table (5) remains stationary at the rotated angle. Subsequently, the transmission pin (62) disengages from the pressure end of the swing arm (71) and elastically retracts into the sliding arm (61) to complete the reset.

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