A welding device for surfacing a stainless steel sealing surface on a cast iron valve matrix

Abstract

The present invention relates to the field of welding technology. More specifically, it relates to a welding device for surfacing a stainless steel sealing surface on a cast iron valve matrix, which includes a positioner and a welding machine. A positioning and clamping device is rotatably arranged on the mounting surface of the positioner, and a rotary drive mechanism for driving the positioning and clamping device to rotate is arranged between the positioner and the positioning and clamping device; the positioning and clamping device includes a clamping table, a positioning arm and a clamping arm. A first slider and a second slider are slidably arranged on the clamping table. The positioning arm is fixedly arranged on the first slider, and the clamping arm is fixedly arranged on the second slider. In the present invention, the drive gear ring drives the three racks to move synchronously, and then drives the three positioning arms to clamp the valve matrix synchronously. Since the positioning arms always move synchronously along the sides of the equilateral triangle, therefore, the three positioning arms can achieve self-centering of the cast iron matrix, and the gear ring and the racks are all standard parts, with low manufacturing difficulty and better precision control.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and more specifically, to a welding device for surfacing a stainless steel sealing surface on a cast iron valve matrix. Background Art

[0002] With the development of industrial automation, in modern industrial production, the requirements for production efficiency and product quality are getting higher and higher. The development of automation technology has promoted the gradual transformation of traditional manual welding to automated welding. In the valve manufacturing industry, especially for the process of surfacing a stainless steel sealing surface on a cast iron valve matrix, which has relatively high requirements for welding quality, more efficient and precise welding devices are needed.

[0003] When surfacing the sealing surface of the valve matrix, the valve matrix needs to rotate. Therefore, it is necessary to center the valve matrix. Existing positioning mechanisms mostly use three-jaw chucks for centering and clamping. For valve matrices with larger sizes, the manufacturing difficulty and cost of three-jaw chucks are relatively high. The three-jaw chuck is generally driven by a curved guide rail. As an unconventional shape, the curved guide rail is difficult to machine and its accuracy is not easy to guarantee.

[0004] The Chinese utility model patent with the publication number CN207840552U discloses a manual multi-jaw centering and clamping structure for positioning welding of automotive parts. By pushing the push pliers, the clamping arms are driven to synchronously move towards the center of the disc, thereby clamping and fixing the product, making the axis of the product coincide with the center of the disc, and ensuring the consistency of the axis of the welded product. Although this solution realizes self-centering of the product, the disc and the positioning block cannot rotate, and it cannot meet the welding requirements for the sealing surface on the valve matrix.

[0005] The Chinese invention patent with the publication number CN118002968A discloses a welding device for the sealing surface of a valve body. By manually rotating the screw rod to drive the clamping block to move, the clamping block drives the fixed ring to rotate through the magnetic element, and then the limiting groove formed on the fixed ring pushes the clamping rod to clamp the valve body. Due to the complex cooperation relationship between the clamping rod and the limiting groove, in order to ensure the centering accuracy, the requirements for the dimensions and relative positions of the three limiting grooves are relatively high, resulting in a relatively high manufacturing cost.

[0006] Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0007] In order to overcome the deficiencies in the prior art, a welding device for surfacing a stainless steel sealing surface on a cast iron valve matrix with high positioning accuracy and low cost is provided.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0009] A welding device for surfacing a stainless steel sealing surface on a cast iron valve matrix, comprising a positioner and a welding machine. A positioning and clamping device is rotatably arranged on the mounting surface of the positioner, and a rotary drive mechanism for driving the positioning and clamping device to rotate is arranged between the positioner and the positioning and clamping device;

[0010] The positioning and clamping device includes a clamping table, a positioning arm and a clamping arm. Sliding grooves are arranged on three long sides of the clamping table at an angle of 60°. A first slider and a second slider are slidably arranged in each sliding groove. The positioning arm is fixedly arranged on the first slider, and the clamping arm is arranged on the second slider.

[0011] A driving gear ring is rotatably arranged on the lower side of the clamping table. A rack meshing with the driving gear ring is fixedly connected to the first slider. A positioning sleeve hole is fixedly arranged on the lower side of the clamping table. A gear shaft is arranged in the positioning sleeve hole. The middle part of the gear shaft meshes with the driving gear ring. The upper end of the gear shaft is fixedly connected with a spline shaft. A spline cavity matching with the spline shaft is arranged in the positioning sleeve hole. A compression spring for separating the spline shaft from the spline cavity is arranged in the positioning sleeve hole;

[0012] A first tooth socket is fixedly connected to the lower end of the gear shaft. A positioning motor is fixedly arranged on the clamping table. A second tooth socket matching with the first tooth socket is arranged on the motor shaft of the positioning motor. The matching surface of the first tooth socket and the second tooth socket is an inclined surface.

[0013] Preferably, the rotary drive mechanism includes a driving motor. An internal gear ring is fixedly arranged in the driving gear ring. The driving motor is fixedly arranged on the positioner, and a driving gear meshing with the internal gear ring is arranged on the motor shaft of the driving motor.

[0014] Preferably, a horizontal plane connected to the inclined surface is arranged on the first tooth socket or the second tooth socket. The motor shaft of the positioning motor is connected with a torque sensor. When the first tooth socket and the second tooth socket are disengaged, the torque sensor sends a signal to control the positioning motor to stop rotating.

[0015] Preferably, the clamping arm includes a rotating rod, an L-shaped sleeve and a pressing member. The rotating rod is rotatably arranged on the second slider. An external thread is arranged at the upper end of the rotating rod. The L-shaped sleeve is sleeved on the upper end of the rotating rod and is in threaded cooperation with the rotating rod. A connecting rod is slidably arranged on the horizontal section of the L-shaped sleeve. The pressing member is arranged on the lower side of the connecting rod. A rubber pad is arranged at the lower end of the pressing member;

[0016] A positioning rack is arranged on the inner side of the sliding groove. A positioning gear is fixedly connected to the lower end of the rotating rod. A rotating shaft is rotatably arranged in the second slider in the vertical direction. A small gear meshing with the positioning rack is fixedly arranged at the upper end of the rotating shaft, and a large gear meshing with the positioning gear is fixedly arranged at the lower end of the rotating shaft.

[0017] Preferably, a locking groove is provided in the second slider, a engaging rack is provided on the inner side of the chute, a limiting rack cooperating with the engaging rack is slidably provided in the locking groove, and a return spring is provided between the limiting rack and the locking groove;

[0018] On the side of the limiting rack away from the engaging rack, a connecting rod I is slidably provided. At both ends of the connecting rod I, a connecting rod II and a connecting rod III which are arranged in parallel are hinged. The ends of the connecting rod II and the connecting rod III away from the connecting rod I are hinged to the second slider, and the connecting rod II is fixedly connected with a handle.

[0019] Preferably, it further includes a welding machine base and a welding machine frame. The welding machine base is located on one side of the positioner, and the welding machine frame is arranged on the welding machine base through a length adjusting mechanism and a height adjusting mechanism. The welding machine is detachably arranged on the welding machine frame.

[0020] Preferably, the welding machine frame includes a mounting shaft and a mounting plate. The mounting plate is rotatably connected to the mounting shaft, and a positioning plate for vertically limiting the mounting plate is fixedly provided on the mounting shaft; the welding machine is arranged at one end of the mounting plate, and a knocking assembly is arranged at the other end of the mounting plate;

[0021] A positioning hole is provided on the positioning plate, a jack is provided on the mounting plate, and the positioning plate and the mounting plate are limited by a pin shaft.

[0022] Preferably, the knocking assembly includes a knocking hammer and a knocking motor. A sliding hole is provided at one end of the mounting plate. The knocking hammer is slidably arranged in the sliding hole. Guide grooves are provided on both sides of the sliding hole. Guide blocks which are slidably matched with the guide grooves are fixedly connected to both sides of the knocking hammer. Limiting springs are provided between the upper and lower sides of the guide blocks and the ends of the guide grooves;

[0023] A cam which cooperates with the bottom of the knocking hammer is rotatably arranged at the inner end of the sliding hole. The knocking motor is arranged on the mounting plate, and the motor shaft of the knocking motor is in transmission connection with the cam.

[0024] The beneficial effects of the present invention compared with the prior art are as follows:

[0025] 1. In the present invention, the driving gear ring drives the three racks to move synchronously, and then drives the three positioning arms to clamp the valve base synchronously. Since the positioning arms always move synchronously along the sides of the equilateral triangle, therefore, the three positioning arms can realize self-centering of the cast iron base, and the gear ring and the racks are all standard parts, with low manufacturing difficulty and better accuracy control.

[0026] 2. In the present invention, torque transmission is carried out through the cooperation of the first tooth sleeve and the second tooth sleeve. When the positioning arm contacts the valve base, the torque between the first tooth sleeve and the second tooth sleeve increases, so that the first tooth sleeve moves upward and disconnects from the second tooth sleeve. At this time, the spline shaft is inserted into the spline cavity to lock the gear shaft and the driving gear ring, realizing positioning and holding.

[0027] 3. The present invention clamps the valve body by means of a clamping arm. When the second slider moves along the chute, the pinion gear cooperates with the positioning rack to drive the rotating shaft to rotate, and then drives the rotating rod to rotate through the cooperation of the large gear and the positioning gear, so that the L-shaped sleeve and the pressing member move downward to press the valve body. After the valve body is pressed, the handle is released, and the limit rack presses and engages with the engaging rack under the action of the return spring to lock the second slider.

[0028] 4. The present invention is provided with a knocking component on the welding machine frame. After welding is completed, impurities at the weld can be removed through the knocking component. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following will further elaborate on the specific implementation manners of the present invention through the drawings.

[0030] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 is a schematic diagram of the structure of the positioning and clamping device and the welding machine base of the present invention;

[0032] Figure 3 is a schematic diagram of the lower part of the positioning and clamping device of the present invention;

[0033] Figure 4 is a schematic diagram of the internal structure of the positioning and clamping device of the present invention;

[0034] Figure 5 is a schematic diagram of the side structure of the positioning and clamping device of the present invention;

[0035] Figure 6 is Figure 5 a partial enlarged view of A in

[0036] Figure 7 is a schematic diagram of the internal structure of the second slider of the present invention;

[0037] Figure 8 is a schematic diagram of the structure of the welding machine base of the present invention;

[0038] Figure 9 is a schematic diagram of the internal structure of the positioning plate of the present invention;

[0039] Figure 10 is a sectional view at the gear shaft of the present invention.

[0040] In the figure: 1 - positioner, 2 - welding machine, 3 - positioning and clamping device, 31 - clamping table, 32 - positioning arm, 33 - torque sensor, 34 - chute, 35 - first slider, 36 - second slider, 37 - driving gear ring, 38 - rack, 39 - positioning sleeve hole, 310 - gear shaft, 311 - spline shaft, 312 - spline cavity, 313 - compression spring, 314 - first tooth socket, 315 - positioning motor, 316 - second tooth socket, 317 - horizontal plane, 4 - rotary drive mechanism, 41 - internal gear ring, 42 - driving gear, 5 - clamping arm, 51 - rotating rod, 52 - L-shaped sleeve, 53 - pressing member, 54 - connecting rod, 55 - rubber pad, 56 - positioning rack, 57 - positioning gear, 58 - rotating shaft, 59 - locking groove, 510 - limiting rack, 511 - return spring, 512 - connecting rod Ⅰ, 513 - connecting rod Ⅱ, 514 - connecting rod Ⅲ, 515 - handle, 516 - engaging rack, 6 - welding machine base, 61 - welding machine frame, 62 - length adjusting mechanism, 63 - height adjusting mechanism, 64 - mounting shaft, 65 - mounting plate, 66 - positioning plate, 67 - pin shaft, 7 - knocking assembly, 71 - knocking hammer, 72 - knocking motor, 73 - guide groove, 74 - guide block, 75 - limiting spring, 76 - cam. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiment:

[0043] As Figures 1 to 10 shown, a welding device for surfacing a stainless steel sealing surface on a cast iron valve matrix includes a positioner 1 and a welding machine 2. A positioning and clamping device 3 is rotatably arranged on the mounting surface of the positioner 1. A rotary drive mechanism 4 for driving the positioning and clamping device 3 to rotate is arranged between the positioner 1 and the positioning and clamping device 3. The positioner 1 can adopt the existing technology and is used to change the angle of the surface to be welded so that the welding point is in a horizontal state as much as possible. The positioning and clamping device 3 is used to position and clamp the valve matrix. Since the sealing surface of the valve matrix is a rotary surface, the rotary drive mechanism 4 drives the positioning and clamping device 3 and the valve matrix thereon to rotate, so that the welding machine 2 can weld the entire sealing surface.

[0044] Specifically, the positioning and clamping device 3 includes a clamping table 31, a positioning arm 32, and a clamping arm 5. Three long sides of the clamping table 31 with a 60° included angle are each provided with a chute 34. A first slider 35 and a second slider 36 are slidably arranged in each chute 34. The positioning arm 32 is fixedly arranged on the first slider 35, and the outer circumferential surface or inner circumferential surface of the valve base is positioned by three synchronously moving positioning arms 32. The clamping arm 5 is arranged on the second slider 36, and the movement of the second slider 36 drives the clamping arm 5 to clamp the valve base.

[0045] In order to make the three first sliders 35 move synchronously, a driving gear ring 37 is rotatably arranged on the lower side of the clamping table 31. A rack 38 meshing with the driving gear ring 37 is fixedly connected to the first slider 35. When the driving gear ring 37 rotates, it drives the three racks 38 to move synchronously, realizing the synchronous control of the three first sliders 35.

[0046] A positioning sleeve hole 39 is fixedly arranged on the lower side of the clamping table 31. A gear shaft 310 is arranged in the positioning sleeve hole 39. The gear shaft 310 can not only rotate in the positioning sleeve hole 39 but also move up and down relative to the positioning sleeve hole 39. The middle part of the gear shaft 310 meshes with the driving gear ring 37. The upper end of the gear shaft 310 is fixedly connected with a spline shaft 311. A spline cavity 312 matching with the spline shaft 311 is arranged in the positioning sleeve hole 39. A compression spring 313 for separating the spline shaft 311 from the spline cavity 312 is arranged in the positioning sleeve hole 39. The lower end of the gear shaft 310 is fixedly connected with a first tooth sleeve 314. A positioning motor 315 is fixedly arranged on the clamping table 31. A second tooth sleeve 316 matching with the first tooth sleeve 314 is arranged on the motor shaft of the positioning motor 315. The mating surface of the first tooth sleeve 314 and the second tooth sleeve 316 is an inclined surface.

[0047] The positioning motor 315 drives the second tooth sleeve 316 to rotate. The cooperation between the first tooth sleeve 314 and the second tooth sleeve 316 drives the gear shaft 310 to rotate, and then drives the driving gear ring 37 to rotate. When the positioning arm 32 contacts the valve base, the movement resistance of the first slider 35 increases. At this time, the torque transmitted between the first tooth sleeve 314 and the second tooth sleeve 316 increases, causing the first tooth sleeve 314 to move upward against the elastic force of the compression spring 313, driving the gear shaft 31 and the spline shaft 311 to move upward and insert into the spline cavity 312, realizing circumferential limitation, and then locking the gear shaft 31 and the driving gear ring 37.

[0048] Preferably, a horizontal plane 317 connected to the inclined plane is provided on the first tooth nesting 314 or the second tooth nesting 316. A torque sensor 33 is connected to the motor shaft of the positioning motor 315. The torque sensor 33 uses an existing sensor for measuring the shaft torque. When the second tooth nesting 316 is separated from the first tooth nesting 314, the convex teeth of the second tooth nesting 316 or the first tooth nesting 314 abut against the corresponding horizontal plane 317. At this time, the torque sensor 3 detects that the torque of the motor shaft suddenly becomes smaller, and the torque sensor 33 sends a signal to control the positioning motor 315 to stop rotating. Specifically, the positioning motor 315 is controlled by a motor drive board and a controller, and the torque sensor 33 sends the signal to the controller.

[0049] In order to drive the overall rotation of the valve base, the rotation drive mechanism 4 includes a drive motor. An internal gear ring 41 is fixedly arranged inside the drive gear ring 37. The drive motor is fixedly arranged on the positioner 1, and a driving gear 42 meshing with the internal gear ring 41 is arranged on the motor shaft of the drive motor. After the drive gear ring 37 is locked with the clamping table 31, the drive motor drives the driving gear 42 to rotate, and then drives the drive gear ring 37 and the clamping table 31 to rotate through the internal gear ring 41.

[0050] In order to reliably clamp the valve base, the clamping arm 5 includes a rotating rod 51, an L-shaped sleeve 52 and a pressing member 53. The rotating rod 51 is rotatably arranged on the second slider 36. An external thread is arranged at the upper end of the rotating rod 51. The L-shaped sleeve 52 is sleeved on the upper end of the rotating rod 51 and is in threaded cooperation with the rotating rod 51. By rotating the rotating rod 51, the height of the L-shaped sleeve 52 can be adjusted. A connecting rod 54 is slidably arranged on the horizontal section of the L-shaped sleeve 52, and the pressing member 53 is arranged on the lower side of the connecting rod 54. A rubber pad 55 is arranged at the lower end of the pressing member 53.

[0051] A positioning rack 56 is arranged inside the chute 34. The lower end of the rotating rod 51 is fixedly connected with a positioning gear 57. A rotating shaft 58 is rotatably arranged in the second slider 36 in the vertical direction. A small gear meshing with the positioning rack 56 is fixedly arranged at the upper end of the rotating shaft 58, and a large gear meshing with the positioning gear 57 is fixedly arranged at the lower end of the rotating shaft 58. During use, the second slider 36 is pulled to move along the chute 34. The small gear meshes with the positioning rack 56 to drive the rotating shaft 58 to rotate, and then drives the rotating rod 51 to rotate through the large gear meshing with the positioning gear 57. Manually restrict the pressing member 53 from moving horizontally. When the rotating rod 51 rotates, it drives the L-shaped sleeve 52 to descend, and the pressing member 53 moves downward to press the valve base.

[0052] After the pressing member 53 presses the valve body, the position of the second slider 36 needs to be locked. Specifically, a locking groove 59 is provided in the second slider 36, a engaging rack 516 is provided on the inner side of the sliding groove 34, a limiting rack 510 that cooperates with the engaging rack 516 is slidably arranged in the locking groove 59, and a return spring 511 is arranged between the limiting rack 510 and the locking groove 59; the limiting rack 510 is pressed by the return spring 511 so that the limiting rack 510 meshes with the engaging rack 516 to achieve locking.

[0053] A connecting rod I 512 is slidably arranged on the side of the limiting rack 510 away from the engaging rack 516. Both ends of the connecting rod I 512 are hinged with a connecting rod II 513 and a connecting rod III 514 arranged in parallel. The ends of the connecting rod II 513 and the connecting rod III 514 away from the connecting rod I 512 are hinged on the second slider 36, and the connecting rod II 513 or the connecting rod III 514 is fixedly connected with the handle 515. By pulling the handle 515, the limiting rack 510 can be separated from the engaging rack 516.

[0054] To install the welding machine 2, a welding machine base 6 and a welding machine frame 61 are further included. The welding machine base 6 is located on one side of the positioner 1. The welding machine frame 61 is arranged on the welding machine base 6 through a length adjusting mechanism 62 and a height adjusting mechanism 63, and the welding machine 2 is detachably arranged on the welding machine frame 61. The length adjusting mechanism 62 and the height adjusting mechanism 63 adopt the prior art. For example, both the length adjusting mechanism 62 and the height adjusting mechanism 63 adopt telescopic rods with adjustable lengths.

[0055] The welding machine frame 61 includes a mounting shaft 64 and a mounting plate 65. The mounting plate 65 is rotatably connected to the mounting shaft 64. The welding machine 2 is arranged at one end of the mounting plate 65, and a knocking assembly 7 is arranged at the other end of the mounting plate 65. By rotating the mounting plate 65 by 180 degrees, the welding machine 2 and the knocking assembly 7 can be changed.

[0056] To limit the mounting plate 65, a positioning plate 66 for vertically limiting the mounting plate 65 is fixedly arranged on the mounting shaft 64; specifically, a positioning hole is arranged on the positioning plate 66, a jack is arranged on the mounting plate 65, and the positioning plate 66 and the mounting plate 65 are limited by a pin shaft 67.

[0057] Preferably, the knocking assembly 7 includes a knocking hammer 71 and a knocking motor 72. A sliding hole is arranged at one end of the mounting plate 65. The knocking hammer 71 is slidably arranged in the sliding hole. Guide grooves 73 are arranged on both sides of the sliding hole. Guide blocks 74 fixedly connected to both sides of the knocking hammer 71 are slidably matched with the guide grooves 73, and the stroke of the knocking hammer 71 is limited by the guide blocks 74. Limiting springs 75 are arranged between the upper and lower sides of the guide blocks 74 and the ends of the guide grooves 73.

[0058] A cam 76 that cooperates with the bottom of the percussion hammer 71 is rotatably arranged at the inner end of the sliding hole. The percussion motor 72 is arranged on the mounting plate 65. The motor shaft of the percussion motor 72 is drivingly connected to the cam 76, and the percussion hammer 71 is excited by the cam 76.

[0059] Only the preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A welding device for surfacing a stainless steel sealing surface on a cast iron valve matrix, comprising a positioner (1) and a welding machine (2), characterized in that: A positioning and clamping device (3) is rotatably arranged on the installation surface of the turntable (1), and a rotary drive mechanism (4) for driving the positioning and clamping device (3) to rotate is arranged between the turntable (1) and the positioning and clamping device (3); The positioning and clamping device (3) includes a clamping table (31), a positioning arm (32) and a clamping arm (5). Sliding grooves (34) are arranged on the three long sides of the clamping table (31) with an included angle of 60°. A first slider (35) and a second slider (36) are slidably arranged in each of the sliding grooves (34). The positioning arm (32) is fixedly arranged on the first slider (35), and the clamping arm (5) is arranged on the second slider (36). A driving gear ring (37) is rotatably arranged on the lower side of the clamping table (31). A rack (38) meshing with the driving gear ring (37) is fixedly connected to the first slider (35). A positioning sleeve hole (39) is fixedly arranged on the lower side of the clamping table (31). A gear shaft (310) is arranged in the positioning sleeve hole (39). The middle part of the gear shaft (310) meshes with the driving gear ring (37). A spline shaft (311) is fixedly connected to the upper end of the gear shaft (310). A spline cavity (312) matching with the spline shaft (311) is arranged in the positioning sleeve hole (39). A compression spring (313) for separating the spline shaft (311) from the spline cavity (312) is arranged in the positioning sleeve hole (39). A first tooth socket (314) is fixedly connected to the lower end of the gear shaft (310). A positioning motor (315) is fixedly arranged on the clamping table (31). A second tooth socket (316) matching with the first tooth socket (314) is arranged on the motor shaft of the positioning motor (315). The matching surface of the first tooth socket (314) and the second tooth socket (316) is an inclined surface. A horizontal surface (317) connected to the inclined surface is arranged on the first tooth socket (314) or the second tooth socket (316). The motor shaft of the positioning motor (315) is connected with a torque sensor (33). When the first tooth socket (314) and the second tooth socket (316) are disengaged, the torque sensor (33) sends a signal to control the positioning motor (315) to stop rotating. The clamping arm (5) includes a rotating rod (51), an L-shaped sleeve (52) and a pressing member (53). The rotating rod (51) is rotatably arranged on the second slider (36). External threads are arranged at the upper end of the rotating rod (51). The L-shaped sleeve (52) is sleeved on the upper end of the rotating rod (51) and is in threaded cooperation with the rotating rod (51). A connecting rod (54) is slidably arranged on the horizontal section of the L-shaped sleeve (52). The pressing member (53) is arranged on the lower side of the connecting rod (54). A rubber pad (55) is arranged at the lower end of the pressing member (53). A positioning rack (56) is arranged on the inner side of the sliding groove (34). A positioning gear (57) is fixedly connected to the lower end of the rotating rod (51). A rotating shaft (58) is rotatably arranged in the second slider (36) in the vertical direction. A small gear meshing with the positioning rack (56) is fixedly arranged at the upper end of the rotating shaft (58). A large gear meshing with the positioning gear (57) is fixedly arranged at the lower end of the rotating shaft (58). When the second slider moves along the chute, the pinion gear cooperates with the positioning rack to drive the rotating shaft to rotate, and then drives the rotating rod to rotate through the cooperation of the large gear and the positioning gear, so that the L-shaped sleeve and the pressing member move downward.

2. The welding device for surfacing a stainless steel sealing surface on a cast iron valve matrix according to claim 1, wherein: The rotation driving mechanism (4) includes a driving motor. An internal gear ring (41) is fixedly arranged inside the driving gear ring (37). The driving motor is fixedly arranged on the positioner (1), and a driving gear (42) meshing with the internal gear ring (41) is arranged on the motor shaft of the driving motor.

3. A welding device for surfacing a stainless steel sealing surface on a cast iron valve matrix according to claim 1, characterized in that: A locking groove (59) is arranged inside the second slider (36). A engaging rack (516) is arranged on the inner side of the chute (34). A limiting rack (510) cooperating with the engaging rack (516) is slidably arranged in the locking groove (59). A return spring (511) is arranged between the limiting rack (510) and the locking groove (59). A connecting rod I (512) is slidably arranged on the side of the limiting rack (510) away from the engaging rack (516). Two parallel connecting rods II (513) and connecting rods III (514) are hinged at both ends of the connecting rod I (512). The ends of the connecting rods II (513) and connecting rods III (514) away from the connecting rod I (512) are hinged on the second slider (36). The connecting rod II (513) is fixedly connected with a handle (515).

4. A welding device for surfacing a stainless steel sealing surface on a cast iron valve matrix according to claim 1, characterized in that: It further includes a welding machine base (6) and a welding machine frame (61). The welding machine base (6) is located on one side of the positioner (1). The welding machine frame (61) is arranged on the welding machine base (6) through a length adjusting mechanism (62) and a height adjusting mechanism (63). The welding machine (2) is detachably arranged on the welding machine frame (61).

5. The welding device for surfacing a stainless steel sealing surface on a cast iron valve matrix according to claim 4, characterized in that: The welding machine frame (61) includes a mounting shaft (64) and a mounting plate (65). The mounting plate (65) is rotatably connected to the mounting shaft (64). A positioning plate (66) for vertically limiting the mounting plate (65) is fixedly arranged on the mounting shaft (64). The welding machine (2) is arranged at one end of the mounting plate (65), and a knocking component (7) is arranged at the other end of the mounting plate (65). Positioning holes are arranged on the positioning plate (66). Jacking holes are arranged on the mounting plate (65). The positioning plate (66) and the mounting plate (65) are limited by a pin shaft (67).

6. The welding device for surfacing a stainless steel sealing surface on a cast iron valve matrix according to claim 5, characterized in that: The knocking component (7) includes a knocking hammer (71) and a knocking motor (72). A sliding hole is arranged at one end of the mounting plate (65). The knocking hammer (71) is slidably arranged in the sliding hole. Guide grooves (73) are arranged on both sides of the sliding hole. Guide blocks (74) slidably matched with the guide grooves (73) are fixedly connected to both sides of the knocking hammer (71). Limiting springs (75) are arranged between the upper and lower sides of the guide blocks (74) and the ends of the guide grooves (73). A cam (76) cooperating with the bottom of the knocking hammer (71) is rotatably arranged at the inner end of the sliding hole. The knocking motor (72) is arranged on the mounting plate (65), and the motor shaft of the knocking motor (72) is in transmission connection with the cam (76).

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