An adjustable assembled bidirectional butterfly valve welding device

Abstract

The present application relates to valve welding technical field, more specifically, it relates to a kind of adjustable assembled bidirectional butterfly valve welding device, including fixed welding frame, movable welding frame, centering shaft and welding machine, coaxial sleeve is provided with mounting sleeve I on centering shaft, and first inner hole centering mechanism is arranged on mounting sleeve I;Floating welding platform is slidably arranged on movable welding frame, and positioning sleeve is connected on floating welding platform, mounting sleeve II is rotatably arranged on positioning sleeve, second inner hole centering mechanism is arranged on mounting sleeve II, and centering shaft is inserted into positioning sleeve and limits the radial movement of positioning sleeve when movable welding frame moves along guide rail to the direction of centering shaft.This application, positioning sleeve, mounting sleeve I are positioned by the same centering shaft, so that positioning sleeve and mounting sleeve I can maintain high coaxiality, and mounting sleeve II is coaxially arranged on positioning sleeve, therefore, mounting sleeve II and mounting sleeve I also have high coaxiality, can guarantee the butt joint precision of flange and valve body.

Description

Technical Field

[0001] This invention relates to the field of valve body welding technology, and more specifically, to an adjustable assembly-type bidirectional butterfly valve welding device. Background Technology

[0002] In industrial piping systems, butterfly valves are crucial control components, and their manufacturing quality directly impacts the system's safety and reliability. Particularly during the welding process between the valve body and flange, traditional methods such as fixed welding equipment or manual welding have significant limitations. These methods struggle to achieve precise inner bore alignment for butterfly valves of different sizes and specifications, leading to large weld position deviations that affect sealing performance and pressure resistance. Furthermore, traditional fixed structures have poor adaptability to different butterfly valve models, and the process of changing welding fixtures is complex and time-consuming, reducing production efficiency.

[0003] Manual welding relies heavily on the welder's experience and skill level. Manual operation is prone to errors, making it difficult to guarantee consistent welding parameters and thus affecting product quality stability. Furthermore, manual welding presents safety concerns; welders are exposed to harmful environments for extended periods, increasing health risks and the likelihood of accidents. Additionally, traditional welding equipment is typically limited to welding functions and lacks integrated post-weld processing methods, making post-weld finishing steps such as grinding cumbersome and increasing overall production costs.

[0004] Chinese utility model patent CN212858373U discloses a welding fixture for butterfly valve processing. It places the valve body component on the upper part of a valve body rotary table. A valve body fixture motor drives a valve body fixture reducer, which in turn rotates the valve body rotary table and the valve body component, allowing workers to perform welding in a fixed position, improving welding quality and production efficiency. However, it cannot accurately align the two components to be welded, resulting in poor welding precision.

[0005] Chinese invention patent application CN117102735A discloses a welding equipment and method for universal couplings. It uses a rotary drive mechanism to rotate the main shaft and fork sections of the coupling to be welded at a uniform speed. Simultaneously, a beveling mechanism grinds the bevels at both ends, ensuring the weld pool is evenly distributed inside the bevel, improving weld quality, uniformity, reducing coupling deformation, and increasing welding strength. However, because the main shaft roller and fork roller are mounted on the same central rod, it can only align two parts of the same size, making it unsuitable for valve body and flange connections.

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

[0007] To overcome the shortcomings of existing technologies, a centering-adjustable assembly-type bidirectional butterfly valve welding device with high centering accuracy and adaptability to butterfly valves of different sizes is provided.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0009] An adjustable assembly type bidirectional butterfly valve welding device includes a fixed welding frame, a movable welding frame, a centering shaft, and a welding machine. The centering shaft is horizontally arranged on the fixed welding frame, and a guide rail parallel to the centering shaft is provided 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 drive mechanism that drives it to move along the guide rail.

[0010] The centering shaft is coaxially fitted with an installation sleeve I, and the installation sleeve I is provided with a first inner hole centering mechanism;

[0011] A floating welding table is slidably mounted on the movable welding frame in the vertical direction. A horizontally positioned positioning sleeve is fixedly connected to the floating welding table. The welding machine is mounted on the positioning sleeve. An installation sleeve II is rotatably mounted on the positioning sleeve. A second inner hole centering mechanism is provided on the installation sleeve II. When the movable welding frame moves along the guide rail towards the centering axis, the centering axis is inserted into the positioning sleeve and the radial movement of the positioning sleeve is restricted.

[0012] A circumferential limiting structure is provided between the mounting sleeve I and the mounting sleeve II, and a tightening mechanism is provided between the first inner hole centering mechanism and the fixed welding frame;

[0013] The positioning sleeve is equipped with a rotary drive mechanism that drives the mounting sleeve II to rotate.

[0014] Preferably, a grinding table is provided below the positioning sleeve, and two sets of guide wheels are rotatably arranged on the grinding table, one set of guide wheels being connected to a driver.

[0015] A weld seam grinder is installed on the grinding table.

[0016] Preferably, the first inner hole alignment mechanism includes a first positioning ring and a second positioning ring arranged along the axial direction of the mounting sleeve I. The first positioning ring is fixedly connected to the mounting sleeve I, and the second positioning ring is slidably connected to the mounting sleeve I. A first connecting rod and a second connecting rod are respectively hinged to the first positioning ring and the second positioning ring. The middle parts of the first connecting rod and the second connecting rod are hinged together. 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. Multiple positioning plates are provided and evenly distributed along the circumference of the mounting sleeve I.

[0017] A lead screw is rotatably mounted on the mounting sleeve I, with a drive motor connected to one end of the lead screw, and a sleeve that is threadedly engaged with the lead screw is fixedly mounted on the second positioning ring.

[0018] Preferably, a bearing seat is fixedly provided on the mounting sleeve I, and the bearing seat and the lead screw are symmetrical about the center of the mounting sleeve I. A limiting block is provided on the centering axis, and a limiting groove is provided on the mounting sleeve I. When the mounting sleeve I is not in contact with the mounting sleeve II, the limiting groove and the limiting block cooperate to limit the circumferential movement of the mounting sleeve I. At this time, the bearing seat is in a vertically upward state.

[0019] Preferably, the clamping mechanism includes a support bearing, a clamping spring, and a drive plate. The support bearing is coaxially arranged with the centering shaft. One side of the support bearing is fixedly connected to the mounting sleeve I, and the other side of the support bearing is connected to one end of the clamping spring. The other end of the clamping spring is connected to the drive plate. A linear actuator is provided between the drive plate and the fixed welding frame or the centering shaft.

[0020] Preferably, the rotary drive mechanism includes a gear ring and a rotary motor. The gear ring is coaxially fixed on the mounting sleeve II, and the rotary motor is fixed on the positioning sleeve. The motor shaft of the rotary motor is provided with a drive gear that meshes with the gear ring.

[0021] Preferably, the second inner hole centering mechanism includes a centering frame, a centering gear ring, and a centering rack. The centering frame is fixedly mounted on the mounting sleeve II, and the centering gear ring is rotatably mounted on the centering frame and coaxially mounted with the mounting sleeve II.

[0022] The centering frame is provided with three sliding grooves with an included angle of 60°. Three centering racks are provided and are slidably disposed in the corresponding sliding grooves. The centering gear ring is connected to a gear ring driver. The centering gear ring meshes with the three centering racks respectively. Positioning rollers are provided on the three centering racks respectively.

[0023] Preferably, the positioning sleeve is provided with multiple mounting arms that are hinged together in sequence, and a locking device is provided between adjacent mounting arms. The welding machine is located at the end of the mounting arms.

[0024] Preferably, the grinding table is a lifting table, and the grinding table is slidably mounted on the guide rail.

[0025] The beneficial effects of this invention compared to the prior art are as follows:

[0026] 1. In this invention, the positioning sleeve and the mounting sleeve I are positioned by the same centering axis, so that the positioning sleeve and the mounting sleeve I can maintain a high degree of coaxiality. The mounting sleeve II is coaxially set on the positioning sleeve, and the mounting sleeve II and the mounting sleeve I also have a high degree of coaxiality. The first inner hole centering mechanism and the second inner hole centering mechanism are both self-centering mechanisms, so the docking accuracy between the flange and the valve body can be guaranteed.

[0027] 2. In this invention, after the movable welding frame moves to the set position, the tightening mechanism drives the first inner hole centering mechanism and the valve body on it to move towards the flange and press against the flange, which can avoid rigid collision between the valve body and the flange.

[0028] 3. In this invention, the welding machine is set on the positioning sleeve. There is no relative displacement between the welding machine and the flange, only relative rotation. Therefore, once the position of the welding machine is determined, the entire weld can be welded without adjustment. Attached Figure Description

[0029] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Figure 1 This is a structural schematic diagram of the present invention from one angle;

[0031] Figure 2 This is a structural schematic diagram of the present invention from another angle;

[0032] Figure 3 This is a three-dimensional structural diagram of the first inner hole centering mechanism;

[0033] Figure 4 This is a schematic diagram of the limiting block.

[0034] Figure 5 This is a front view schematic diagram of the centering mechanism for the first inner hole;

[0035] Figure 6 A schematic diagram of the second inner hole centering mechanism at one angle;

[0036] Figure 7 This is a schematic diagram of the second inner hole centering mechanism from another angle;

[0037] In the diagram: 1-Fixed welding frame, 11-Linear drive mechanism, 2-Modible welding frame, 21-Floating welding table, 22-Positioning sleeve, 23-Mounting sleeve II, 24-Rotary drive mechanism, 25-Gear ring, 26-Rotary motor, 27-Drive 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 62-First positioning ring, 63-Second positioning ring, 64-First connecting rod, 65-Second connecting rod, 66-Positioning plate, 67-Lead screw, 68-Drive motor, 79-Second inner hole centering mechanism, 70-Centering frame, 71-Centering gear ring, 72-Centering rack, 73-Centering rack, 74-Gear ring driver, 75-Positioning roller, 80-Tightening mechanism, 81-Support bearing, 82-Tightening spring, 83-Drive plate, 84-Linear driver, 91-Grinding table, 92-Guide wheel, 93-Driver, 94-Weld seam grinder. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example:

[0040] 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 shaft 3, and a welding machine 4. The centering shaft 3 is horizontally mounted on the fixed welding frame 1, and a guide rail 5 parallel to the centering shaft 3 is provided on the fixed welding frame 1. The movable welding frame 2 is slidably mounted on the guide rail 5 and is connected to a linear drive mechanism 11 that drives 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 mechanism. The fixed welding frame 1 supports the valve body, and the movable welding frame 2 supports the flange. The linear drive mechanism 11 drives the movable welding frame 2 to move towards the fixed welding frame 1, so that the flange and the valve body are connected, thus achieving welding.

[0041] To precisely position the valve body, a mounting sleeve I 31 is coaxially fitted onto the central shaft 3. A first inner hole alignment mechanism 6 is provided on the mounting sleeve I 31. The first inner hole alignment mechanism 6 includes a first positioning ring 61 and a second positioning ring 62 arranged axially along the mounting sleeve I 31. The first positioning ring 61 is fixedly connected to the mounting sleeve I 31, and 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 respectively hinged to the first positioning ring 61 and the second positioning ring 62. 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 via a slider, and the outer end of the second connecting rod 64 is hinged to the positioning plate 65. Multiple positioning plates 65 are provided and evenly distributed along the circumference of the mounting sleeve I 31. A lead screw 66 is rotatably mounted on the mounting sleeve I 31, with one end of the lead screw 66 connected to a drive motor 67. A sleeve that threadedly engages with the lead screw 66 is fixedly mounted on the second positioning ring 62. The drive motor 67 drives the lead screw 66 to rotate, which in turn drives the second positioning ring 66 to slide towards the first positioning ring 61, causing multiple positioning plates 65 to move outward and position the inner wall of the valve body.

[0042] To accurately position the flange, a floating welding table 21 is slidably mounted vertically on the movable welding frame 2. Preferably, the floating welding table 21 and the movable welding frame 2 are supported by springs. A horizontally positioned positioning sleeve 22 is fixedly connected to the floating welding table 21. An installation sleeve II 23 is rotatably mounted on the positioning sleeve 22. A second inner hole alignment mechanism 7 is provided on the installation sleeve II 23. Preferably, the second inner hole alignment mechanism 7 includes an alignment frame 71, an alignment gear ring 72, and an alignment rack 73. The alignment frame 71 is fixedly mounted on the installation sleeve II 23. The alignment gear ring 72 is rotatably mounted on the alignment frame 71 and coaxially mounted with the installation sleeve II 23. The alignment gear ring 72 is connected to a gear ring driver 74, which drives the alignment gear ring 72 to rotate. Preferably, the gear ring driver 74 can adopt a motor plus gear structure. The motor is mounted on the alignment frame 71, and the gear is mounted on the motor shaft and meshes with the alignment gear ring 72.

[0043] The centering frame 71 is provided with three sliding grooves with an included angle of 60°. Three centering racks 73 are provided and slidably disposed in their respective sliding grooves. Centering gear rings 72 mesh with the three centering racks 73 respectively, and positioning rollers 75 are provided on the three centering racks 73 respectively. When the gear ring driver 74 drives the centering gear ring 72 to rotate, it synchronously drives the three centering racks 73 to move along the sliding grooves, thereby driving the three positioning rollers 75 to move synchronously to position the inner hole or outer surface of the flange.

[0044] When the movable welding frame 2 moves along the guide rail 5 towards the centering shaft 3, the centering shaft 3 is inserted into the positioning sleeve 22, restricting the radial movement of the positioning sleeve 22. A chamfer can be provided at the end of the centering shaft 3 to facilitate insertion into the positioning sleeve 22 and sliding engagement with it. Preferably, in its initial state, the axis of the positioning sleeve 22 can be slightly higher than the axis of the centering shaft 3. After the centering shaft 3 is inserted into the positioning sleeve 22, the positioning sleeve 22 can support the centering shaft 3. Since the positioning sleeve 22 and the mounting sleeve I 31 are mounted on the same centering shaft 3, the coaxiality of the positioning sleeve 22 and the mounting sleeve I 31 can be guaranteed. Similarly, since the mounting sleeve II 23 is coaxially mounted with the positioning sleeve 22, the coaxiality of the mounting sleeve II 23 and the mounting sleeve I 31 can be guaranteed. Furthermore, both the first inner hole alignment mechanism 6 and the second inner hole alignment mechanism 7 are self-centering structures, thus ensuring the docking accuracy of the flange and the valve body.

[0045] The welding machine 4 is mounted on the positioning sleeve 22 and is used to weld the mating surfaces of the flange and the valve body. Preferably, the positioning sleeve 22 is provided with multiple hinged mounting arms 41, with locking devices 42 between adjacent mounting arms 41, and the welding machine 4 is located at the end of the mounting arms 41. The position of the welding machine 4 can be adjusted by the multiple mounting arms 41, facilitating the welding of butterfly valves of different specifications.

[0046] A circumferential limiting structure 32 is provided between mounting sleeve I 31 and mounting sleeve II 23. Preferably, the circumferential limiting structure 32 includes teeth provided on mounting sleeve I 31 and mounting sleeve II 23. When mounting sleeve I 31 and mounting sleeve II 23 are connected, the circumferential limiting structure 32 enables mounting sleeve I 31 and mounting sleeve II 23 to rotate synchronously.

[0047] A clamping mechanism 8 is provided between the first inner hole alignment mechanism 6 and the fixed welding frame 1. When the mounting sleeve II 23 reaches the designated position under the drive of the linear drive mechanism 11, the clamping mechanism 8 pushes the first inner hole alignment mechanism 6 to move towards the second inner hole alignment mechanism 7 so that the flange and the valve body are pressed together.

[0048] Preferably, the clamping mechanism 8 includes a support bearing 81, a clamping spring 82, and a drive plate 83. The support bearing 81 is coaxially arranged with the centering shaft 3. One side of the support bearing 81 is fixedly connected to the mounting sleeve I 31, and the other side of the support bearing 81 is connected to one end of the clamping spring 82. The other end of the clamping spring 82 is connected to the drive plate 83. A linear actuator 84 is provided between the drive plate 83 and the fixed welding frame 1 or the centering shaft 3. The linear actuator 84 can be a linear motor. The linear actuator 84 drives the drive plate 83 to move towards the support bearing 81, thereby driving the clamping spring 82 and the support bearing 81 to clamp the mounting sleeve I 31. By setting the support bearing 81, the rotation of the mounting sleeve I 31 does not affect the operation of the clamping spring 82.

[0049] A bearing seat 33 is fixedly installed on the mounting sleeve I 31. When installing the valve body, the valve body can be placed on the bearing seat 33 first, and then centered by the centering mechanism 6 through the first inner hole. The bearing seat 33 and the lead screw 66 are symmetrical about the center of the mounting sleeve I 31 to ensure the dynamic balance of the mounting sleeve I 31 during rotation as much as possible.

[0050] A limiting block 34 is provided on the central shaft 3, and a limiting 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. The limiting groove 35 cooperates with the limiting block 34 and limits the circumferential movement of the mounting sleeve I 31. At this time, the bearing seat 33 is in a vertically upward state, which facilitates the placement of the valve body. When the linear actuator 84 drives the support bearing 81 to press against the mounting sleeve I 31, the limiting groove 35 does not contact the limiting block 34, allowing the mounting sleeve I 31 to rotate relative to the central shaft 3.

[0051] The positioning sleeve 22 is equipped with a rotary drive mechanism 24 that drives the mounting 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 fixed on the mounting sleeve II 23, and the rotary motor 26 is fixed on the positioning sleeve 22. The motor shaft of the rotary motor 26 is equipped with a drive gear 27 that meshes with the gear ring 25. The drive gear 27 drives the mounting sleeve II 23 and the mounting sleeve I 31 to rotate synchronously, thereby driving the flange and the valve body to rotate synchronously.

[0052] A grinding table 9 is located below the positioning sleeve 22. The grinding table 9 is a lifting platform, and two sets of guide wheels 91 are rotatably mounted on it. After welding is completed, the grinding table 9 is raised, and the first inner hole alignment mechanism 6 and the second inner hole alignment mechanism 7 retract, 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 wheels 91 to rotate, which in turn drives the valve body on them to rotate. A weld seam grinder 93 is mounted on the grinding table 9. The weld seam grinder 93 grinds the weld seam of the valve body. The weld seam grinder 93 can adopt existing technology.

[0053] Preferably, the grinding table 9 is slidably mounted on the guide rail 5, and after grinding is completed, it can be moved along the guide rail 5 to remove the valve body.

[0054] The above description only illustrates the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. An adjustable assembly-type bidirectional butterfly valve welding device, characterized in that: It includes a fixed welding frame (1), a movable welding frame (2), a centering shaft (3) and a welding machine (4). The centering shaft (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 shaft (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) that drives it to move along the guide rail (5). The centering shaft (3) is coaxially fitted with an installation sleeve I (31), and the installation sleeve I (31) is provided with a first inner hole centering mechanism (6); The movable welding frame (2) is slidably mounted on a floating welding table (21) in the vertical direction. A horizontally mounted positioning sleeve (22) is fixedly connected to the floating welding table (21). The welding machine (4) is mounted on the positioning sleeve (22). An installation sleeve II (23) is rotatably mounted on the positioning sleeve (22). A second inner hole centering mechanism (7) is mounted on the installation sleeve II (23). 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 restricts the radial movement of the positioning sleeve (22). A circumferential limiting structure (32) is provided between the mounting sleeve I (31) and the mounting 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 installation sleeve II (23) to rotate. The rotary drive mechanism (24) includes a gear ring (25) and a rotary motor (26). The gear ring (25) is coaxially fixed on the mounting sleeve II (23), and the rotary motor (26) is fixed on the positioning sleeve (22). The motor shaft of the rotary motor (26) is provided with a drive gear (27) that meshes with the gear ring (25). A grinding table (9) is provided below the positioning sleeve (22), and two sets of guide wheels (91) are rotatably arranged on the grinding table (9), one of which is connected to a driver (92). A weld grinding tool (93) is provided on the grinding table (9); 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 I (31). The first positioning ring (61) is fixedly connected to the mounting sleeve I (31), and 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 respectively hinged on the first positioning ring (61) and the second positioning ring (62). The middle parts of the first connecting rod (63) and the second connecting rod (64) are hinged together. The outer end of the first connecting rod (63) is connected to a positioning plate (65) through a slider. The outer end of the second connecting rod (64) is hinged to the positioning plate (65). Multiple positioning plates (65) are provided and are evenly distributed along the circumference of the mounting sleeve I (31). A lead screw (66) is rotatably mounted on the mounting sleeve I (31), and a drive motor (67) is connected to one end of the lead screw (66). A sleeve that is threadedly engaged with the lead screw (66) is fixedly mounted on the second positioning ring (62). 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 mounted on the mounting sleeve II (23), and the centering gear ring (72) is rotatably mounted on the centering frame (71) and coaxially mounted with the mounting sleeve II (23). The centering frame (71) is provided with three sliding grooves with an included angle of 60°. The centering rack (73) is provided with three and is slidably disposed in the corresponding sliding grooves. The centering gear ring (72) is connected to the gear ring driver (74). The centering gear ring (72) meshes with the three centering racks (73) respectively. The three centering racks (73) are respectively provided with positioning rollers (75).

2. The adjustable assembly type bidirectional butterfly valve welding device according to claim 1, characterized in that: A bearing seat (33) is fixedly installed on the mounting sleeve I (31). The bearing seat (33) and the lead screw (66) are symmetrical about the center of the mounting sleeve I (31). A limiting block (34) is provided on the centering shaft (3). A limiting groove (35) is provided on the mounting sleeve I (31). When the mounting sleeve I (31) is not in contact with the mounting sleeve II (23), the limiting groove (35) cooperates with the limiting block (34) and limits the mounting sleeve I (31) circumferentially. At this time, the bearing seat (33) is in a vertically upward state.

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

4. The adjustable assembly type bidirectional butterfly valve welding device according to claim 1, characterized in that: The positioning sleeve (22) is provided with a series of hinged mounting arms (41), and a locking device (42) is provided between adjacent mounting arms (41). The welding machine (4) is located at the end of the mounting arms (41).

5. The adjustable assembly type bidirectional butterfly valve welding device according to claim 1, characterized in that: The grinding table (9) is a lifting table, and the grinding table (9) is slidably mounted on the guide rail (5).

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