Automatic welding fixture for rotary tiller spindle

Abstract

The present invention relates to the field of mechanical processing technology, and in particular to an automatic welding fixture for a rotary tiller spindle, comprising a loading rack, a unloading rack and a spindle with a shaft body and a tool holder, a clamping device for spindle welding is arranged between the loading rack and the unloading rack, the clamping device comprises a loading mechanism for removing the shaft body from the loading rack, a moving mechanism for moving the shaft body to a set welding position is arranged at one end of the loading mechanism away from the loading rack, a feeding mechanism is arranged on one side of the loading mechanism, so that after the spindle moves to the set position, the feeding mechanism provides the tool holder required for spindle welding, and a unloading mechanism for moving the welded spindle to the unloading rack is arranged at one end of the moving mechanism away from the loading mechanism, so as to solve the problems in the prior art that small enterprises use manual welding to weld the spindle of rotary tillers with low efficiency and large welding position deviation, and the spindle quality cannot be guaranteed. The present invention has good prospects in rotary tiller manufacturers.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to an automatic welding fixture for a main shaft of a rotary tiller. Background Art

[0002] At present, most small domestic enterprises use manual methods to weld the main shaft of rotary tillers, which is not only labor-intensive and inefficient, but also has large deviations in the welding position of the knife seat, and the quality of the main shaft cannot be guaranteed. Only a few companies use welding robot systems to weld the main shaft of rotary tillers, but due to the high price of the entire welding system, it has not reached the stage of widespread use. Therefore, a special automatic welding fixture for the main shaft of rotary tillers is needed to save labor, reduce construction costs, and improve production efficiency. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an automated welding fixture for the main shaft of a rotary tiller, which solves the problem that small enterprises in the prior art use manual welding of the main shaft of a rotary tiller with low efficiency and large welding position deviation, and cannot guarantee the quality of the main shaft.

[0004] The technical solution is that the automatic welding fixture for the main shaft of a rotary tiller comprises a loading rack, a unloading rack and a main shaft with a shaft body and a tool holder, a clamping device for main shaft welding is arranged between the loading rack and the unloading rack, the clamping device comprises a loading mechanism for removing the shaft body from the loading rack, a moving mechanism for moving the shaft body to a set welding position is arranged at one end of the loading mechanism away from the loading rack, a supply mechanism is arranged on one side of the loading mechanism, so that after the main shaft moves to the set position, the supply mechanism provides the required tool holder for main shaft welding, a unloading mechanism for moving the welded main shaft to the unloading rack is arranged at one end of the moving mechanism away from the loading mechanism, the loading mechanism has the same structure as the unloading mechanism, and the loading mechanism, moving mechanism, supply mechanism and unloading mechanism are all bolted to a base located between the loading rack and the unloading rack.

[0005] Preferably, the feeding mechanism comprises a feeding bottom plate fixed with bolts to the base, a first nut box is arranged on the end of the feeding bottom plate away from the feeding rack, a feeding cylinder is fixed with bolts on the end of the first nut box away from the base, a feeding fixing plate is fixed with bolts on the end of the feeding cylinder away from the first nut box, a feeding clamp for removing the shaft from the feeding rack is arranged on the end of the feeding fixing plate away from the feeding cylinder, a fixing seat is arranged on the end of the feeding bottom plate away from the moving mechanism, a feeding servo motor is fixed with bolts on the fixing seat, a first lead screw used in conjunction with the first nut box is fixed on the output shaft of the feeding servo motor through a coupling, a feeding slide rail for the first nut box to follow the movement of the first lead screw is arranged on the feeding bottom plate, and a feeding slider used in conjunction with the feeding slide rail is arranged on the side of the first nut box close to the feeding bottom plate. A structure is formed in which the feeding clamp moves to a set position under the cooperation of the first lead screw and the first nut box after removing the shaft.

[0006] Preferably, the moving mechanism includes a left moving mechanism and a right moving mechanism, both of which are provided with a second bottom plate, a slide plate with a "U"-shaped cross-section is provided on the second bottom plate, a connecting plate is provided at one end of the slide plate, a first servo motor is provided on the connecting plate, a bidirectional lead screw is fixed to the output shaft of the first servo motor by a coupling, a rack for horizontal rotation of the bidirectional lead screw is provided on the slide plate, second nut boxes for use with the slide plate are provided at both ends of the bidirectional lead screw, second slide rails for movement of the second nut box are provided at both ends of the slide plate, a second sliding block for use with the second slide rail is provided on the outer wall of the second nut box, a chassis is provided at the end of the second nut box away from the slide plate, and a pin for use with the end of the shaft body is provided at the end of the chassis away from the slide plate, so as to form a structure in which the first servo motor drives the bidirectional lead screw to rotate, and the two second nut boxes drive the chassis and the pin to move relative to each other, thereby clamping the shaft body transported by the feeding mechanism.

[0007] Preferably, a second servo motor for driving the ejector pin to rotate is disposed on the chassis, forming a structure in which the second servo motor drives the ejector pin and then drives the shaft body to rotate.

[0008] Preferably, the moving mechanism also includes a first base plate fixed with bolts to the base, a third servo motor is bolted to the first base plate, a gear is arranged on the output shaft of the third servo motor, a rack is arranged on the first base plate for use with the gear, one end of the rack is fixedly connected to the second base plate under the left moving mechanism, and a fixing plate with an "L"-shaped cross-section is arranged at one end of the second base plate of the right moving mechanism close to the first base plate, a fixing groove is arranged on the fixing plate for positioning the second base plate when it moves, and a fixing block is arranged on the second base plate for use with the fixing groove, so that when the third servo motor drives the left moving mechanism to move through the gear rack, the right moving mechanism moves at the same time, thereby ensuring that the shaft bodies move together.

[0009] Preferably, the supply mechanism includes a tool holder rack connected to the base with bolts, a clamping plate is provided at one end of the tool holder rack away from the base, a clamping structure for removing the tool holder from the tool holder rack is provided on the clamping plate, the clamping structure includes a rodless cylinder, an ultra-thin cylinder is bolted to the rodless cylinder, a pneumatic finger used in conjunction with the rodless cylinder is clamped at the output end of the ultra-thin cylinder, forming a structure in which after the ultra-thin cylinder drives the pneumatic finger to clamp the tool holder, the ultra-thin cylinder returns to the starting position, the rodless cylinder drives the ultra-thin cylinder to move above the shaft, and then the ultra-thin cylinder drives the pneumatic finger again to accurately place the tool holder at the set position on the shaft.

[0010] The beneficial effect of the present invention is to change the traditional manual handling of welding raw materials into mechanical loading, and improve the loading method of small and medium-sized processing enterprises without adding a large welding system, which can greatly save labor, reduce construction costs, and improve production efficiency;

[0011] The feeding mechanism drives the feeding gripper to clamp the shaft body and move it up and down through the lifting feeding cylinder. The first lead screw and the first nut box are used in coordination to cause the shaft body to move away from and close to the moving mechanism, thereby realizing the feeding action of the shaft body. The unloading mechanism has the same structure as the feeding mechanism, and transfers the welded spindle to the unloading rack.

[0012] The moving mechanism controls the left moving mechanism and the right moving mechanism to move toward or relative to each other through a bidirectional lead screw, and adopts a pin at the end thereof to clamp the shaft body, and realizes the rotation of the shaft body through a second servo motor that controls the rotation of the pinion, thereby completing the welding work on the peripheral surface of one end of the shaft body, and realizing the lateral movement of the entire shaft body under the drive of the gear rack, thereby ensuring the welding work on the outer surface of the shaft body;

[0013] The supply mechanism is set up, the ultra-thin cylinder drives the pneumatic fingers to the tool holder frame, and after the pneumatic fingers clamp the tool holder, the ultra-thin cylinder returns to the starting position, and the rodless cylinder drives the ultra-thin cylinder, pneumatic fingers and the tool holder clamped by the pneumatic fingers to move above the shaft body, and then the ultra-thin cylinder drives the pneumatic fingers again to accurately place the tool holder on the spindle to weld the spindle and the tool holder;

[0014] The main shaft is fixed by a moving mechanism and clamped or loosened under the action of a bidirectional lead screw, with stable and reliable performance. The main shaft and the tool holder are joined by a supply mechanism under the action of a cylinder, and a welding robot is used to weld the tool holder transported to the shaft body. The welding process is uniformly stressed, with small vibration amplitude and reduced noise frequency. Welding automation saves labor, reduces the workload of staff, improves work efficiency, and the equipment structure is easy to replace and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the automatic welding fixture for the main shaft of a rotary tiller of the present invention;

[0016] Figure 2 It is a top view of the automatic welding fixture for the main shaft of the rotary tiller of the present invention;

[0017] Figure 3 It is a structural diagram of the feeding mechanism of the automatic welding fixture for the main shaft of the rotary tiller of the present invention;

[0018] Figure 4 It is a side view of the feeding mechanism of the automatic welding fixture for the main shaft of the rotary tiller of the present invention;

[0019] Figure 5 It is a side view of the moving mechanism of the automatic welding fixture for the main shaft of the rotary tiller of the present invention;

[0020] Figure 6 It is a structural diagram of the moving mechanism of the automatic welding fixture for the main shaft of the rotary tiller of the present invention;

[0021] Figure 7 It is a structural diagram of the automatic welding fixture supply mechanism of the main shaft of the rotary tiller of the present invention;

[0022] Figure 8 It is a side view of the moving mechanism of the automatic welding fixture for the main shaft of the rotary tiller of the present invention.

[0023] Among them, 1 loading rack, 2 unloading rack, 3 spindle, 301 shaft, 302 tool holder, 4 loading mechanism, 5 moving mechanism, 6 supply mechanism, 7 unloading mechanism, 401 loading bottom plate, 402 first nut box, 403 loading cylinder, 404 loading fixed plate, 405 loading clamp, 406 fixed seat, 407 loading servo motor, 408 first screw, 409 loading slide rail, 410 loading slide block, 501 left moving mechanism, 502 right moving mechanism, 503 The second base plate, 504 slide plate, 505 connecting plate, 506 first servo motor, 507 bidirectional lead screw, 508 second nut box, 509 second slide rail, 510 second slider, 511 chassis, 512 ejector pin, 513 second servo motor, 514 third servo motor, 515 gear, 516 rack, 517 fixed plate, 518 fixed block, 601 tool holder, 602 rodless cylinder, 603 ultra-thin cylinder, 604 pneumatic finger, 605 clamping plate. DETAILED DESCRIPTION

[0024] The technical solutions of various embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0027] Embodiment 1: As shown in the drawings of the specification, the automatic welding fixture of the main shaft 3 of the rotary tiller includes a loading rack 1, a loading rack 2 and a main shaft 3 with a shaft 301 and a knife seat 302. A clamping device for welding the main shaft 3 is provided between the loading rack 1 and the loading rack 2. The clamping device includes a loading mechanism 4 for removing the shaft 301 from the loading rack 1. The loading mechanism 4 removes the shaft 301 from the loading rack 1 and transfers it to the moving mechanism 5. The loading mechanism 4 is provided with a moving mechanism 5 for moving the shaft 301 to a set welding position at one end away from the loading rack 1. The moving mechanism 5 is used to clamp the shaft 301 to prevent the shaft 301 from moving during welding. After the welding of a knife seat 302 is completed, the rotation of the shaft 301 is realized, and then the welding of all the knife seats 302 on the circumferential surface of one end of the shaft 301 is completed; the moving mechanism 5 is also used to move the shaft 301 as a whole in a lateral direction to realize a structure in which all positions of the shaft 301 can be welded. A supply mechanism 6 is provided on one side of the feeding mechanism 4, forming a structure in which the supply mechanism 6 provides the required tool holder 302 for the welding of the main shaft 3 after the main shaft 3 moves to the set position. The supply mechanism 6 is responsible for providing the tool holder 302 required for the welding of the shaft body 301, and the delivery of the tool holder 302 is completed through the cooperation of the rodless cylinder 602, the ultra-thin cylinder 603 and the pneumatic finger 604. A discharge mechanism 7 for moving the welded main shaft 3 to the discharge rack 2 is provided at one end of the moving mechanism 5 away from the feeding mechanism 4. The discharge mechanism 7 removes the welded main shaft 3 from the moving mechanism 5 and transfers it to the discharge rack 2. The feeding mechanism 4 has the same structure as the discharge mechanism 7. The feeding mechanism 4, the moving mechanism 5, the supply mechanism 6 and the discharge mechanism 7 are all bolted to the base located between the feeding rack 1 and the discharge rack 2.

[0028] In one embodiment, as shown in the accompanying drawings, the feeding mechanism 4 includes a feeding bottom plate 401 fixed with bolts to the base, and a first nut box 402 is provided at one end of the feeding bottom plate 401 away from the feeding rack 1. The first nut box 402 is an empty box of a cubic structure, and a nut slider matched with the first lead screw 408 is provided on the box wall of the first nut box 402. The nut slider is an integral structure with the first nut box 402. A feeding cylinder 403 is bolted to one end of the first nut box 402 away from the base, and a feeding fixing plate 404 is bolted to one end of the feeding cylinder 403 away from the first nut box 402, and a feeding clamp 405 for removing the shaft body 301 from the feeding rack 1 is bolted to one end of the feeding fixing plate 404 away from the feeding cylinder 403. The feeding clamp 405 is pneumatically connected to the feeding cylinder 403 to complete the clamping and loosening of the shaft body 301. A fixing seat 406 is bolted to one end of the loading base plate 401 away from the moving mechanism 5, a loading servo motor 407 is bolted to the fixing seat 406, a first lead screw 408 used in conjunction with the first nut box 402 is fixed to the output shaft of the loading servo motor 407 through a coupling, a loading slide rail 409 is provided on the loading base plate 401, which is an integral structure with the first nut box 402 and is used to move following the first lead screw 408, and a loading slider 410 used in conjunction with the loading slide rail 409 is provided on one side of the first nut box 402 close to the loading base plate 401. A structure is formed in which the loading gripper 405 moves to a set position under the cooperation of the first lead screw 408 and the first nut box 402 after taking away the shaft body 301. After the relative position of the loading clamp 405 and the shaft 301 on the loading rack 1 is correct, the loading cylinder 403 starts to work to lift the loading clamp 405, and the loading clamp 405 lifts the shaft 301 from the loading rack 1. The shaft 301 on the loading clamp 405 is clamped by the ejector pin 512 when it reaches the moving mechanism 5, and the loading cylinder 403 stops working, and the loading servo motor 407 drives the ball screw back to the starting point.

[0029] In one embodiment, as shown in the accompanying drawings, the moving mechanism 5 includes a left moving mechanism 501 and a right moving mechanism 502, and the left moving mechanism 501 and the right moving mechanism 502 both include a second base plate 503, and a slide plate 504 with a "U"-shaped cross-section is provided on the second base plate 503, and a connecting plate 505 is welded to one end of the slide plate 504, and a first servo motor 506 is clamped on a fixing frame fixed by bolts on the connecting plate 505. A bidirectional lead screw 507 is fixed to the output shaft of the first servo motor 506 by a coupling, and a frame for horizontal rotation of the bidirectional lead screw 507 is bolted to the slide plate 504, and the cross-section of the frame is triangular. Second nut boxes 508 are provided at both ends of the bidirectional lead screw 507 for use therewith, and second slide rails 509 for movement of the second nut box 508 are provided at both ends of the slide plate 504. The second slide rail 509 is a track formed by the depression of the slide plate 504, and a second slider 510 for use with the second slide rail 509 is provided on the outer wall of the second nut box 508. The second slider 510 and the second nut box 508 are an integral structure. The end of the second nut box 508 away from the slide 504 is bolted to the chassis 511, and the end of the chassis 511 away from the slide 504 is provided with an ejector pin 512 for use with the end of the shaft body 301, forming a structure in which the first servo motor 506 drives the bidirectional lead screw 507 to rotate, and the two second nut boxes 508 drive the chassis 511 and the ejector pin 512 to move relative to each other, thereby clamping the shaft body 301 transported by the feeding mechanism 4. A second servo motor 513 for driving the ejector pin 512 to rotate is bolted to a chassis 511, forming a structure in which the second servo motor 513 drives the ejector pin 512 to rotate and then drives the shaft body 301 to rotate. The top synchronizes the shaft body 301 to rotate a certain angle, completing the welding of the shaft body 301 with the tool holder 302 in different radial directions.

[0030] In one embodiment, as shown in the accompanying drawings, the moving mechanism 5 also includes a first base plate fixed with bolts to the base, a third servo motor 514 is bolted to the first base plate, a gear 515 is keyed to the output shaft of the third servo motor 514, a rack 516 is provided on the first base plate for use with the gear 515, and one end of the rack 516 is welded to the second base plate 503 under the left moving mechanism 501. A fixing plate 517 with an "L"-shaped cross-section is bolted to one end of the second base plate 503 of the right moving mechanism 502 close to the first base plate, and a fixing groove is provided on the fixing plate 517 for positioning the second base plate 503 when it moves. The second base plate 503 is provided with a fixing block 518 used in conjunction with the fixing groove. The fixing block 518 and the second base plate 503 are an integral structure, and lubricating oil is filled in the fixing groove, so that when the third servo motor 514 drives the left moving mechanism 501 to move through the gear 515 and the rack 516, the first servo motor 506 ensures the distance between the left moving mechanism 501 and the right moving mechanism 502, and the right moving mechanism 502 moves at the same time, thereby ensuring that the shaft body 301 moves together.

[0031] In one embodiment, as shown in the accompanying drawings, the supply mechanism 6 includes a tool holder frame 601 connected to the base by bolts, and the tool holder frame 601 has a track with a certain inclination, and the size of the track is just enough to place a group of tool holders 302. When the tool holder 302 is clamped, under the action of force, the next tool holder 302 slides to the position of the previous tool holder 302. A clamping plate 605 is bolted to one end of the tool holder frame 601 away from the base, and a clamping structure for removing the tool holder 302 from the tool holder frame 601 is arranged on the clamping plate 605, the clamping structure includes a rodless cylinder 602, the rodless cylinder 602 is bolted to the clamping plate, an ultra-thin cylinder 603 is bolted to the rodless cylinder 602, and a pneumatic finger 604 used in conjunction with the ultra-thin cylinder 603 is clamped at the output end of the ultra-thin cylinder 603, forming a structure in which the ultra-thin cylinder 603 drives the pneumatic finger 604 to clamp the tool holder 302, and then the ultra-thin cylinder 603 returns to the starting position, and the rodless cylinder 602 drives the ultra-thin cylinder 603 to move above the shaft body 301, and then the ultra-thin cylinder 603 drives the pneumatic finger 604 again to accurately place the tool holder 302 at the set position on the shaft body 301.

[0032] The present invention changes the traditional manual taking of welding raw materials into mechanical loading, and improves the loading method of small and medium-sized processing enterprises without adding a large welding system, which can greatly save labor, reduce construction costs, and improve production efficiency; the loading mechanism drives the loading clamping hand to complete the clamping and up and down movement of the shaft body through the liftable loading cylinder, and the shaft body is caused to move away from and close to the moving mechanism through the coordinated use of the first screw and the first nut box, so as to realize the loading action of the shaft body; the unloading mechanism has the same structure as the loading mechanism, and transfers the welded main shaft to the unloading rack; the moving mechanism controls the left moving mechanism and the right moving mechanism to move toward or relative to each other through the bidirectional screw, adopts the ejector pin at its end to clamp the shaft body, and realizes the rotation of the shaft body through the second servo motor that controls the rotation of the ejector pin, completes the welding work of the peripheral surface of one end of the shaft body, and realizes the shaft body under the drive of the gear rack. The overall lateral movement ensures the welding work on the outer surface of the shaft; the supply mechanism is set up, the ultra-thin cylinder drives the pneumatic fingers to reach the tool holder frame, and after the pneumatic fingers clamp the tool holder, the ultra-thin cylinder returns to the starting position, and the rodless cylinder drives the ultra-thin cylinder, pneumatic fingers and the tool holder clamped by the pneumatic fingers to move to the top of the shaft body, and then the ultra-thin cylinder drives the pneumatic fingers again to put the tool holder accurately on the spindle to weld the spindle and the tool holder; the spindle is fixed by the moving mechanism, and clamped or loosened under the action of the two-way lead screw, with stable and reliable performance, the spindle and the tool holder are joined by the supply mechanism under the action of the cylinder, and the welding robot is used to weld the tool holder transported to the shaft body. The welding process is uniformly stressed, the vibration amplitude is small, and the noise frequency is reduced. Welding automation saves labor and reduces the workload of staff, improves work efficiency, and the equipment structure is easy to replace and has a long service life.

[0033] The present invention has been described in detail above through specific implementation modes and embodiments, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may also make many variations and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. An automatic welding fixture for a rotary tiller spindle, comprising a loading rack (1), a unloading rack (2), and a spindle (3) with a shaft (301) and a knife seat (302), characterized in that: A clamping device for welding the spindle (3) is provided between the loading rack (1) and the unloading rack (2), the clamping device comprising a loading mechanism (4) for removing the shaft body (301) from the loading rack (1), a moving mechanism (5) for moving the shaft body (301) to a set welding position is provided at one end of the loading mechanism (4) away from the loading rack (1), a supply mechanism (6) is provided on one side of the loading mechanism (4), forming a structure in which the supply mechanism (6) provides a tool holder (302) required for welding the spindle (3) after the spindle (3) moves to the set position, and a unloading mechanism (302) for moving the welded spindle (3) to the unloading rack (2) is provided at one end of the moving mechanism (5) away from the loading mechanism (4). 7), the loading mechanism (4) and the unloading mechanism (7) have the same structure, the loading mechanism (4), the moving mechanism (5), the supply mechanism (6) and the unloading mechanism (7) are all bolted to a base located between the loading frame (1) and the unloading frame (2), the loading mechanism (4) comprises a loading base plate (401) bolted to the base, a first nut box (402) is provided at one end of the loading base plate (401) away from the loading frame (1), a loading cylinder (403) is bolted to one end of the first nut box (402) away from the base, a loading cylinder (403) is bolted to one end of the loading cylinder (403) away from the first nut box (402), a loading fixing plate (517) (404) is bolted to one end of the loading cylinder (403) away from the first nut box (402), and the loading fixing plate (517) (404) is bolted to one end of the loading cylinder (403) away from the first nut box (402). A loading gripper (405) for removing the shaft (301) from the loading rack (1) is provided at one end of the (404) away from the loading cylinder (403), a fixing seat (406) is provided at one end of the loading base plate (401) away from the moving mechanism (5), a loading servo motor (407) is bolted to the fixing seat (406), a first lead screw (408) for use with a first nut box (402) is fixed to the output shaft of the loading servo motor (407) via a coupling, a loading slide rail (409) is provided on the loading base plate (401) for the first nut box (402) to follow the first lead screw (408), and the first nut box (402) is close to the loading base plate (401). ) is provided with a loading slider (410) used in conjunction with a loading slide rail (409), forming a structure in which the loading gripper (405) moves to a set position in conjunction with the first lead screw (408) and the first nut box (402) after taking away the shaft (301), the moving mechanism (5) comprising a left moving mechanism (501) and a right moving mechanism (502), the left moving mechanism (501) and the right moving mechanism (502) both being provided with a second bottom plate (503), a slide plate (504) having a "U"-shaped cross section being provided on the second bottom plate (503), a connecting plate (505) being provided at one end of the slide plate (504), a first servo motor (506) being provided on the connecting plate (505),A bidirectional lead screw (507) is fixed to the output shaft of the first servo motor (506) by a coupling, a frame for horizontally rotating the bidirectional lead screw (507) is provided on the slide plate (504), second nut boxes (508) for use with the slide plate (504) are provided at both ends of the bidirectional lead screw (507), second slide rails (509) for moving the second nut box (508) are provided at both ends of the slide plate (504), and a second nut box (508) is provided on the outer wall of the second nut box (508). A second sliding block (510) is used in conjunction with the second sliding rail (509); a housing (511) is provided at one end of the second nut box (508) away from the sliding plate (504); a pin (512) for use in conjunction with the end of the shaft (301) is provided at one end of the housing (511) away from the sliding plate (504); the first servo motor (506) drives the bidirectional lead screw (507) to rotate, and the two second nut boxes (508) drive the housing (511) and the pin (512) to move relative to each other. The structure for clamping the shaft (301) transported by the feeding mechanism (4), the feeding mechanism (6) comprising a tool holder frame (601) connected to the base by bolts, the tool holder frame (601) being provided with a clamping plate (605) at one end away from the base, the clamping plate (605) being provided with a clamping structure for removing the tool holder (302) from the tool holder frame (601), the clamping structure comprising a rodless cylinder (602), an ultra-thin cylinder (603) being bolted to the rodless cylinder (602) The output end of the ultra-thin cylinder (603) is clamped with a pneumatic finger (604) used in conjunction with it, so that the ultra-thin cylinder (603) drives the pneumatic finger (604) to clamp the knife seat (302), and then the ultra-thin cylinder (603) returns to the starting position, and the rodless cylinder (602) drives the ultra-thin cylinder (603) to move above the shaft (301), and then the ultra-thin cylinder (603) drives the pneumatic finger (604) again to accurately place the knife seat (302) at a set position on the shaft (301).

2. The automatic welding fixture for the main shaft of a rotary tiller according to claim 1 is characterized in that: A second servo motor (513) for driving the ejector pin (512) to rotate is disposed on the chassis (511), forming a structure in which the second servo motor (513) drives the ejector pin (512) and further drives the shaft body (301) to rotate.

3. The automatic welding fixture for the main shaft of a rotary tiller according to claim 1 is characterized in that: The moving mechanism (5) further comprises a first bottom plate fixed with bolts to the base, a third servo motor (514) being fixed with bolts to the first bottom plate, a gear (515) being arranged on the output shaft of the third servo motor (514), a rack (516) being arranged on the first bottom plate for use in conjunction with the gear (515), one end of the rack (516) being fixedly connected to the second bottom plate (503) under the left moving mechanism (501), and the second bottom plate (503) of the right moving mechanism (502) being close to the second bottom plate (503). A fixing plate (517) having an L-shaped cross section is disposed at one end of a base plate, and a fixing groove is disposed on the fixing plate (517) for positioning the second base plate (503) when the second base plate (503) moves. The second base plate (503) is provided with a fixing block (518) used in conjunction with the fixing groove, so that when the third servo motor (514) drives the left moving mechanism (501) to move via the gear (515) and the rack (516), the right moving mechanism (502) moves simultaneously, thereby ensuring that the shaft body (301) moves together.

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