Adjustable assembly type bidirectional butterfly valve welding device

Abstract

The invention relates to the technical field of valve body welding, in particular to an adjustable assembly type bidirectional butterfly valve welding device which comprises a fixed welding frame, a movable welding frame, a centering shaft and a welding machine, the centering shaft is coaxially sleeved with a mounting sleeve I, and a first inner hole centering mechanism is arranged on the mounting sleeve I; a floating welding table is slidably arranged on the movable welding frame, a positioning sleeve is connected to the floating welding table, a mounting sleeve II is rotatably arranged on the positioning sleeve, a second inner hole centering mechanism is arranged on the mounting sleeve II, and when the movable welding frame moves towards the centering shaft along the guide rail, the centering shaft is inserted into the positioning sleeve and limits radial movement of the positioning sleeve. The positioning sleeve and the mounting sleeve I are positioned through the same centering shaft, so that higher coaxiality can be kept between the positioning sleeve and the mounting sleeve I, and the mounting sleeve II is coaxially arranged on the positioning sleeve, so that higher coaxiality also exists between the mounting sleeve II and the mounting sleeve I, and the butt joint precision of the flange and the valve body can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of valve body welding, and more specifically to an adjustable assembled bidirectional butterfly valve welding device. Background Art

[0002] In industrial piping systems, butterfly valves are important control components, and their manufacturing quality is directly related to the safety and reliability of the system. In particular, in the welding process of the butterfly valve body and flange, traditional methods such as fixed welding devices or manual welding have significant limitations. These methods make it difficult to achieve accurate inner hole alignment of butterfly valves of different sizes and specifications, resulting in large welding position deviations, affecting sealing performance and pressure resistance. In addition, the traditional fixed structure has poor adaptability to different types of butterfly valves, and the process of replacing welding fixtures is complicated and time-consuming, reducing production efficiency.

[0003] Manual welding depends on the welder's experience and technical level. Manual operation is prone to errors and cannot guarantee the consistency of welding parameters, which in turn affects the stability of product quality. At the same time, manual welding also has safety issues. Welders are exposed to harmful environments for a long time, which increases health risks and the possibility of accidents. In addition, traditional welding devices are usually limited to welding functions and lack integrated post-processing methods, making post-welding grinding and other processing steps cumbersome, increasing overall production costs.

[0004] The Chinese utility model patent with publication number CN212858373U discloses a welding tool for butterfly valve processing, which places the valve body component on the upper end of the valve body rotating table, drives the valve body tool reducer to work through the valve body tool motor, and the valve body tool reducer drives the valve body rotating table and the valve body component to rotate, so that workers can weld at a fixed position, improving welding quality and production efficiency. However, it is impossible to accurately align the two parts to be welded, resulting in poor welding accuracy.

[0005] The Chinese invention patent application with publication number CN117102735A discloses a universal coupling welding processing equipment and processing method thereof, which drives the main shaft part and the fork head part of the coupling to be welded to rotate at a uniform speed through a rotary drive mechanism, and grinds the grooves at the ends of both parts through a groove processing mechanism, so that the molten pool generated by welding can be evenly distributed on the inner side of the groove, improves the formation quality of the weld bead, makes the weld bead more uniform, reduces the deformation of the coupling, and improves the welding strength of the coupling. However, the main shaft roller and the fork head roller are arranged on the same roller center rod, which means that it can only align two parts of the same size, and is not suitable for the butt joint of the valve body and the flange.

[0006] Therefore, it is necessary to improve the prior art. Summary of the invention

[0007] In order to overcome the deficiencies in the prior art, a centering adjustable assembled bidirectional butterfly valve welding device is provided which has high centering accuracy and can adapt to butterfly valves of different sizes.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: An adjustable assembled bidirectional butterfly valve welding device comprises a fixed welding frame, a movable welding frame, a centering shaft and a welding machine, wherein the centering shaft is horizontally arranged on the fixed welding frame, a guide rail parallel to the centering shaft is arranged on the fixed welding frame, the movable welding frame is slidably arranged on the guide rail, and the movable welding frame is connected to a linear driving mechanism for driving it to move along the guide rail; The centering shaft is coaxially sleeved with a mounting sleeve I, and the mounting sleeve I is provided with a first inner hole centering mechanism; A floating welding table is slidably arranged on the movable welding frame in the vertical direction, a horizontally arranged positioning sleeve is fixedly connected to the floating welding table, a welding machine is arranged on the positioning sleeve, a mounting sleeve II is rotatably arranged on the positioning sleeve, a second inner hole centering mechanism is arranged on the mounting sleeve II, when the movable welding frame moves along the guide rail toward the centering axis direction, the centering axis is inserted into the positioning sleeve and limits the radial movement of the positioning sleeve; A circumferential limiting structure is provided between the installation sleeve I and the installation sleeve II, and a tightening mechanism is provided between the first inner hole centering mechanism and the fixed welding frame; The positioning sleeve is provided with a rotary driving mechanism for driving the mounting sleeve II to rotate.

[0009] Preferably, a grinding table is provided below the positioning sleeve, and two sets of guide wheels are rotatably provided on the grinding table, and one set of guide wheels is connected to a driver; A weld grinder is arranged on the grinding table.

[0010] Preferably, the first inner hole centering mechanism comprises a first positioning ring and a second positioning ring axially arranged along the mounting sleeve I, the first positioning ring is fixedly connected to the mounting sleeve I, the second positioning ring is slidably connected to the mounting sleeve I, the first positioning ring and the second positioning ring are respectively hinged with a first connecting rod and a second connecting rod, the middle parts of the first connecting rod and the second connecting rod are hinged, the outer end of the first connecting rod is connected to a positioning plate through a slider, and the outer end of the second connecting rod is hinged to the positioning plate; a plurality of positioning plates are provided and are evenly distributed along the circumference of the mounting sleeve I; A lead screw is rotatably arranged on the installation sleeve I, one end of which is connected to a driving motor, and a sleeve that matches the lead screw thread is fixedly arranged on the second positioning ring.

[0011] Preferably, a bearing seat is fixedly provided on the mounting sleeve I, and the bearing seat and the lead screw are symmetrical relative to the center of the mounting sleeve I. A limit block is provided on the centering axis, and a limit groove is provided on the mounting sleeve I. When the mounting sleeve I is not in contact with the mounting sleeve II, the limit groove cooperates with the limit block and limits the mounting sleeve I circumferentially, and the bearing seat is in a vertical upward state at this time.

[0012] Preferably, the tightening mechanism includes a supporting bearing, a tightening spring and a driving plate, the supporting bearing is coaxially arranged with the centering axis, one side of the supporting bearing is fixedly connected to the mounting sleeve I, the other side of the supporting bearing is connected to one end of the tightening spring, the other end of the tightening spring is connected to the driving plate, and a linear drive is arranged between the driving plate and the fixed welding frame or the centering axis.

[0013] Preferably, the rotary drive mechanism comprises a ring gear and a rotary motor, the ring gear is coaxially fixed on the mounting sleeve II, the rotary motor is fixed on the positioning sleeve, and a driving gear meshing with the ring gear is arranged on the motor shaft of the rotary motor.

[0014] Preferably, the second inner hole centering mechanism comprises a centering frame, a centering gear ring and a centering rack, wherein the centering frame is fixedly arranged on the mounting sleeve II, and the centering gear ring is rotatably arranged on the centering frame and is coaxially arranged with the mounting sleeve II; The centering frame is provided with three slide grooves with an angle of 60°, the centering racks are provided with three and are slidably arranged in the corresponding slide grooves respectively, the centering gear ring is connected with a gear ring driver, the centering gear ring is respectively meshed with the three centering racks, and the three centering racks are respectively provided with positioning rollers.

[0015] Preferably, the positioning sleeve is provided with a plurality of mounting arms hinged in sequence, a locking device is provided between adjacent mounting arms, and the welding machine is arranged at the end of the mounting arm.

[0016] Preferably, the grinding table is a lifting table, and the grinding table is slidably arranged on a guide rail.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the positioning sleeve and the mounting sleeve I are positioned by the same centering axis, so that a high coaxiality can be maintained between the positioning sleeve and the mounting sleeve I, and the mounting sleeve II is coaxially arranged on the positioning sleeve, and the mounting sleeve II and the mounting sleeve I also have a high coaxiality, and the first inner hole centering mechanism and the second inner hole centering mechanism are both self-centering mechanisms, therefore, the docking accuracy between the flange and the valve body can be guaranteed.

[0018] 2. In the present invention, after the movable welding frame moves to the set position, the first inner hole centering mechanism and the valve body thereon are driven to move toward the flange direction and press against the flange through the tightening mechanism, thereby avoiding rigid collision between the valve body and the flange.

[0019] 3. In the present invention, the welding machine is arranged on the positioning sleeve, and there is no relative displacement between the welding machine and the flange, but only relative rotation. Therefore, after the position of the welding machine is determined, the entire weld can be welded without adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Figure 1 It is a structural schematic diagram of one angle of the present invention; Figure 2 It is a structural schematic diagram of another angle of the present invention; Figure 3 is a schematic diagram of the three-dimensional structure of the first inner hole centering mechanism; Figure 4 It is a structural schematic diagram of the limit block; Figure 5 is a front view structural schematic diagram of the first inner hole centering mechanism; Figure 6 It is a structural schematic diagram of the second inner hole centering mechanism at one angle; Figure 7 It is a structural schematic diagram of the second inner hole centering mechanism from another angle; In the figure: 1-fixed welding frame, 11-linear driving mechanism, 2-movable welding frame, 21-floating welding table, 22-positioning sleeve, 23-mounting sleeve II, 24-rotation driving mechanism, 25-gear ring, 26-rotation motor, 27-driving gear, 3-centering shaft, 31-mounting sleeve I, 32-circumferential limiting structure, 33-bearing seat, 34-limiting block, 35-limiting groove, 4-welding machine, 41-mounting arm, 42-locking device, 5-guide rail, 6-first inner hole centering mechanism, 61 -first positioning ring, 62-second positioning ring, 63-first connecting rod, 64-second connecting rod, 65-positioning plate, 66-screw, 67-driving motor, 7-second inner hole centering mechanism, 71-centering frame, 72-centering gear ring, 73-centering rack, 74-gear ring driver, 75-positioning roller, 8-tensioning mechanism, 81-support bearing, 82-tensioning spring, 83-drive plate, 84-linear drive, 9-grinding table, 91-guide wheel, 92-driver, 93-weld grinder. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example:

[0024] like Figures 1 to 7 As shown, an adjustable assembled bidirectional butterfly valve welding device includes a fixed welding frame 1, a movable welding frame 2, a centering axis 3 and a welding machine 4. The centering axis 3 is horizontally arranged on the fixed welding frame 1. The fixed welding frame 1 is provided with a guide rail 5 parallel to the centering axis 3. The movable welding frame 2 is slidably arranged on the guide rail 5. The movable welding frame 2 is connected to a linear drive mechanism 11 for driving it to move along the guide rail 5. The linear drive mechanism 11 can adopt existing technology, such as a linear motor or a screw screw mechanism. The fixed welding frame 1 is used to support the valve body, and the movable welding frame 2 is used to support the flange. The movable welding frame 2 is driven by the linear drive mechanism 11 to move toward the fixed welding frame 1, so that the flange is butted with the valve body to achieve welding.

[0025] In order to accurately position the valve body, a mounting sleeve Ⅰ31 is coaxially sleeved on the centering shaft 3, and a first inner hole centering mechanism 6 is arranged on the mounting sleeve Ⅰ31. The first inner hole centering mechanism 6 includes a first positioning ring 61 and a second positioning ring 62 arranged along the axial direction of the mounting sleeve Ⅰ31. The first positioning ring 61 is fixedly connected to the mounting sleeve Ⅰ31, and the second positioning ring 62 is slidably connected to the mounting sleeve Ⅰ31. The first positioning ring 61 and the second positioning ring 62 are respectively hinged with a first connecting rod 63 and a second connecting rod 64. The middle parts of the first connecting rod 63 and the second connecting rod 64 are hinged. The outer end of the first connecting rod 63 is connected to a positioning plate 65 through a slider, and the outer end of the second connecting rod 64 is hinged to the positioning plate 65; multiple positioning plates 65 are arranged and evenly distributed along the circumference of the mounting sleeve Ⅰ31. A lead screw 66 is rotatably arranged on the mounting sleeve Ⅰ31, and a driving motor 67 is connected to one end of the lead screw 66. A sleeve threadedly matched with the lead screw 66 is fixedly arranged on the second positioning ring 62. The lead screw 66 is driven to rotate by the driving motor 67, thereby driving the second positioning ring 66 to slide toward the first positioning ring 61, so that the plurality of positioning plates 65 move outward to position the inner wall of the valve body.

[0026] In order to accurately position the flange, a floating welding platform 21 is slidably arranged on the movable welding frame 2 in the vertical direction. Preferably, the floating welding platform 21 and the movable welding frame 2 are supported by springs. A horizontally arranged positioning sleeve 22 is fixedly connected to the floating welding platform 21. A mounting sleeve II 23 is rotatably arranged on the positioning sleeve 22. A second inner hole centering mechanism 7 is arranged on the mounting sleeve II 23. Preferably, the second inner hole centering mechanism 7 includes a centering frame 71, a centering gear ring 72 and a centering rack 73. The centering frame 71 is fixedly arranged on the mounting sleeve II 23. The centering gear ring 72 is rotatably arranged on the centering frame 71 and is coaxially arranged with the mounting sleeve II 23. The centering gear ring 72 is connected to a gear ring driver 74, and the centering gear ring 72 is driven to rotate by the gear ring driver 74. Preferably, the gear ring driver 74 can adopt a motor plus gear structure. The motor is arranged on the centering frame 71, and the gear is arranged on the motor shaft of the motor and meshes with the centering gear ring 72.

[0027] The centering frame 71 is provided with three slide grooves with an angle of 60°, three centering racks 73 are provided and are slidably arranged in the corresponding slide grooves, the centering ring gear 72 is respectively engaged with the three centering racks 73, and the three centering racks 73 are respectively provided with positioning rollers 75. When the ring gear driver 74 drives the centering ring gear 72 to rotate, the three centering racks 73 are synchronously driven to move along the slide groove, and then the three positioning rollers 75 are driven to move synchronously to position the inner hole or outer cylindrical surface of the flange.

[0028] When the movable welding frame 2 moves along the guide rail 5 toward the centering axis 3, the centering axis 3 is inserted into the positioning sleeve 22 and the radial movement of the positioning sleeve 22 is limited. The end of the centering axis 3 can be chamfered to facilitate insertion into the positioning sleeve 22 and sliding cooperation with the positioning sleeve 22. Preferably, when the positioning sleeve 22 is in the initial state, its axis can be slightly higher than the axis of the centering axis 3. When the centering axis 3 is inserted into the positioning sleeve 22, the positioning sleeve 22 can support the centering axis 3. Since the positioning sleeve 22 and the mounting sleeve I 31 are arranged on the same centering axis 3, the coaxiality of the positioning sleeve 22 and the mounting sleeve I 31 can be guaranteed. Since the mounting sleeve II 23 is coaxially arranged with the positioning sleeve 22, the coaxiality of the mounting sleeve II 23 and the mounting sleeve I 31 can be guaranteed. Further, the first inner hole centering mechanism 6 and the second inner hole centering mechanism 7 are both self-centering structures, so the docking accuracy of the flange and the valve body can be guaranteed.

[0029] The welder 4 is arranged on the positioning sleeve 22, and the butt joint surfaces of the flange and the valve body are welded by the welder. Preferably, the positioning sleeve 22 is provided with a plurality of mounting arms 41 hinged in sequence, a locking device 42 is provided between adjacent mounting arms 41, and the welder 4 is arranged at the end of the mounting arm 41. The position of the welder 4 can be adjusted through the plurality of mounting arms 41, so as to facilitate the welding of butterfly valves of different specifications.

[0030] A circumferential limiting structure 32 is provided between the installation sleeve I 31 and the installation sleeve II 23. Preferably, the circumferential limiting structure 32 includes teeth provided on the installation sleeve I 31 and the installation sleeve II 23. When the installation sleeve I 31 and the installation sleeve II 23 are butted, the circumferential limiting structure 32 allows the installation sleeve I 31 and the installation sleeve II 23 to rotate synchronously.

[0031] A tightening mechanism 8 is arranged between the first inner hole centering mechanism 6 and the fixed welding frame 1. When the installation sleeve II 23 reaches the specified position driven by the linear drive mechanism 11, the tightening mechanism 8 pushes the first inner hole centering mechanism 6 to move toward the second inner hole centering mechanism 7 so that the flange and the valve body are pressed tightly.

[0032] Preferably, the tightening mechanism 8 comprises a supporting bearing 81, a tightening spring 82 and a driving plate 83. The supporting bearing 81 is coaxially arranged with the centering shaft 3. One side of the supporting bearing 81 is fixedly connected with the mounting sleeve Ⅰ31, and the other side of the supporting bearing 81 is connected with one end of the tightening spring 82. The other end of the tightening spring 82 is connected with the driving plate 83. A linear drive 84 is arranged between the driving plate 83 and the fixed welding frame 1 or the centering shaft 3. The linear drive 84 can be a linear motor. The linear drive 84 drives the driving plate 83 to move toward the supporting bearing 81, thereby driving the tightening spring 82 and the supporting bearing 81 to tighten the mounting sleeve Ⅰ31. By arranging the supporting bearing 81, the rotation of the mounting sleeve Ⅰ31 does not affect the work of the tightening spring 82.

[0033] The mounting sleeve Ⅰ31 is fixedly provided with a bearing seat 33. When installing the valve body, the valve body can be placed on the bearing seat 33 first, and then centered by the first inner hole centering mechanism 6. The bearing seat 33 and the lead screw 66 are symmetrical relative to the center of the mounting sleeve Ⅰ31, and the dynamic balance of the mounting sleeve Ⅰ31 during rotation is ensured as much as possible.

[0034] A limit block 34 is provided on the centering shaft 3, and a limit groove 35 is provided on the mounting sleeve I 31. In the initial state, the mounting sleeve I 31 does not contact the mounting sleeve II 23, and the limit groove 35 cooperates with the limit block 34 and limits the circumferential position of the mounting sleeve I 31. At this time, the bearing seat 33 is in a vertically upward state, which is convenient for placing the valve body. When the linear drive 84 drives the supporting bearing 81 to press against the mounting sleeve I 31, the limit groove 35 does not contact the limit block 34, so that the mounting sleeve I 31 can rotate relative to the centering shaft 3.

[0035] The positioning sleeve 22 is provided with a rotary drive mechanism 24 for driving the installation sleeve II 23 to rotate. Preferably, the rotary drive mechanism 24 includes a gear ring 25 and a rotary motor 26. The gear ring 25 is coaxially fixedly arranged on the installation sleeve II 23, and the rotary motor 26 is fixedly arranged on the positioning sleeve 22. A driving gear 27 meshing with the gear ring 25 is arranged on the motor shaft of the rotary motor 26. The driving gear 27 drives the installation sleeve II 23 and the installation sleeve I 31 to rotate synchronously, thereby driving the flange and the valve body to rotate synchronously.

[0036] A grinding table 9 is arranged below the positioning sleeve 22. The grinding table 9 adopts a lifting table. Two sets of guide wheels 91 are rotatably arranged on the grinding table 9. After welding is completed, the grinding table 9 rises, and the first inner hole centering mechanism 6 and the second inner hole centering mechanism 7 are retracted, so that the welded valve body falls between the two sets of guide wheels 91. One set of guide wheels 91 is connected to a driver 92; the driver 92 drives the guide wheel 91 to rotate, and then drives the valve body thereon to rotate. A weld grinder 93 is arranged on the grinding table 9. The weld of the valve body is grinded by the weld grinder 93. The weld grinder 93 can adopt the existing technology.

[0037] Preferably, the grinding table 9 is slidably arranged on the guide rail 5, and can be moved along the guide rail 5 to remove the valve body after grinding is completed.

[0038] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the protection scope of the present invention.

Claims

1. An adjustable assembled two-way butterfly valve welding device, characterized in that: The device comprises a fixed welding frame (1), a movable welding frame (2), a centering axis (3) and a welding machine (4); the centering axis (3) is horizontally arranged on the fixed welding frame (1); a guide rail (5) parallel to the centering axis (3) is arranged on the fixed welding frame (1); the movable welding frame (2) is slidably arranged on the guide rail (5); and the movable welding frame (2) is connected to a linear drive mechanism (11) for driving the movable welding frame (2) to move along the guide rail (5); A mounting sleeve I (31) is coaxially sleeved on the centering shaft (3), and a first inner hole centering mechanism (6) is provided on the mounting sleeve I (31); A floating welding platform (21) is slidably arranged on the movable welding frame (2) in a vertical direction, a horizontally arranged positioning sleeve (22) is fixedly connected to the floating welding frame (21), a welding machine (4) is arranged on the positioning sleeve (22), a mounting sleeve II (23) is rotatably arranged on the positioning sleeve (22), a second inner hole centering mechanism (7) is arranged on the mounting sleeve II (23), and when the movable welding frame (2) moves along the guide rail (5) toward the centering axis (3), the centering axis (3) is inserted into the positioning sleeve (22) and limits the radial movement of the positioning sleeve (22); A circumferential limiting structure (32) is provided between the installation sleeve I (31) and the installation sleeve II (23), and a tightening mechanism (8) is provided between the first inner hole centering mechanism (6) and the fixed welding frame (1); The positioning sleeve (22) is provided with a rotary drive mechanism (24) for driving the mounting sleeve II (23) to rotate.

2. The adjustable assembled bidirectional butterfly valve welding device according to claim 1 is characterized in that: A grinding table (9) is arranged below the positioning sleeve (22), and two sets of guide wheels (91) are rotatably arranged on the grinding table (9), one set of guide wheels (91) is connected to a driver (92); A weld grinder (93) is provided on the grinding table (9).

3. The adjustable assembled bidirectional butterfly valve welding device according to claim 1 is characterized in that: The first inner hole centering mechanism (6) comprises a first positioning ring (61) and a second positioning ring (62) which are axially arranged along the mounting sleeve I (31); the first positioning ring (61) is fixedly connected to the mounting sleeve I (31); the second positioning ring (62) is slidably connected to the mounting sleeve I (31); a first connecting rod (63) and a second connecting rod (64) are hingedly connected to the first positioning ring (61) and the second positioning ring (62), respectively; the middle parts of the first connecting rod (63) and the second connecting rod (64) are hingedly connected; the outer end of the first connecting rod (63) is connected to a positioning plate (65) via a slider; the outer end of the second connecting rod (64) is hingedly connected to the positioning plate (65); a plurality of positioning plates (65) are provided and are evenly distributed along the circumference of the mounting sleeve I (31); A lead screw (66) is rotatably arranged on the mounting sleeve I (31), one end of the lead screw (66) is connected to a driving motor (67), and a sleeve threadably matched with the lead screw (66) is fixedly arranged on the second positioning ring (62).

4. The adjustable assembled bidirectional butterfly valve welding device according to claim 3 is characterized in that: A bearing seat (33) is fixedly arranged on the mounting sleeve I (31), and the bearing seat (33) and the lead screw (66) are symmetrical relative to the center of the mounting sleeve I (31). A limit block (34) is arranged on the centering shaft (3), and a limit groove (35) is arranged on the mounting sleeve I (31); when the mounting sleeve I (31) is not in contact with the mounting sleeve II (23), the limit groove (35) cooperates with the limit block (34) to limit the circumferential position of the mounting sleeve I (31), and at this time, the bearing seat (33) is in a vertically upward state.

5. The adjustable assembled bidirectional butterfly valve welding device according to claim 1 is characterized in that: The clamping mechanism (8) comprises a supporting bearing (81), a clamping spring (82) and a driving plate (83); the supporting bearing (81) is coaxially arranged with the centering shaft (3); one side of the supporting bearing (81) is fixedly connected to the mounting sleeve I (31); the other side of the supporting bearing (81) is connected to one end of the clamping spring (82); the other end of the clamping spring (82) is connected to the driving plate (83); a linear drive (84) is arranged between the driving plate (83) and the fixed welding frame (1) or the centering shaft (3).

6. The adjustable assembled bidirectional butterfly valve welding device according to claim 1 is characterized in that: The rotary drive mechanism (24) comprises a ring gear (25) and a rotary motor (26); the ring gear (25) is coaxially fixedly arranged on the mounting sleeve II (23); the rotary motor (26) is fixedly arranged on the positioning sleeve (22); and a driving gear (27) meshing with the ring gear (25) is arranged on the motor shaft of the rotary motor (26).

7. The adjustable assembled bidirectional butterfly valve welding device according to claim 1 is characterized in that: The second inner hole centering mechanism (7) comprises a centering frame (71), a centering gear ring (72) and a centering rack (73), wherein the centering frame (71) is fixedly arranged on the mounting sleeve II (23), and the centering gear ring (72) is rotatably arranged on the centering frame (71) and is coaxially arranged with the mounting sleeve II (23); The centering frame (71) is provided with three slide grooves with an included angle of 60 degrees, the centering racks (73) are provided with three and are slidably arranged in the corresponding slide grooves respectively, the centering ring gear (72) is connected to a ring gear driver (74), the centering ring gear (72) is respectively meshed with the three centering racks (73), and the three centering racks (73) are respectively provided with positioning rollers (75).

8. The adjustable assembled bidirectional butterfly valve welding device according to claim 1 is characterized in that: The positioning sleeve (22) is provided with a plurality of mounting arms (41) that are hinged in sequence, and locking devices (42) are provided between adjacent mounting arms (41). The welding machine (4) is arranged at the end of the mounting arm (41).

9. The adjustable assembled bidirectional butterfly valve welding device according to claim 2, characterized in that: The grinding table (9) is a lifting table, and the grinding table (9) is slidably arranged on the guide rail (5).

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