A variable-size valve body welding tooling and its usage method

Abstract

The present invention relates to the field of valve body welding tooling, and particularly to a variable-size valve body welding tooling and its usage method. It includes a bending plate and a valve body A. A supporting plate is slidably arranged on the vertical section of the bending plate. The valve body A is located at the upper end of the supporting plate. An inclined plate is arranged at the upper end of the bending plate, and the inclined plate is connected to the valve body A by means of bolt insertion. L-shaped plates are symmetrically and slidably arranged on both sides of the supporting plate, and limiting components are also symmetrically arranged on the supporting plate. Through the sliding arrangement of the supporting plate on the bending plate and its cooperation with the inclined plate, the present invention can limit the valve body of different sizes in the up-and-down direction, ensuring that the valve body will not shake or displace in the up-and-down direction during welding. At the same time, the inclined plate can limit the top of the valve body by means of bolt insertion, providing stable up-and-down support for the valve body, ensuring the position accuracy of the valve body in the vertical direction, thus ensuring the stability of the up-and-down position of the valve body during the welding process and improving the welding quality.

Description

Technical Field

[0001] The present invention relates to the field of valve body welding tooling, and particularly to a variable-size valve body welding tooling and its using method. Background Art

[0002] In modern industry, the valve body is the key of the fluid control system and is widely used in fields such as petroleum and chemical industry. Its welding quality is related to the sealing performance, strength of the valve body and the operation safety of the system. Therefore, an efficient and accurate welding tooling is extremely important. In the early stage, manual welding of the valve body was used, which had low efficiency and unstable quality and was difficult to meet the requirements of mass production for quality consistency. With the development of the manufacturing industry, although welding tooling has emerged and improved the welding efficiency and quality, there are still limitations.

[0003] Most of the existing tooling can only limit and fix the valve body with a specific size. Facing valve bodies with different sizes, it is necessary to redesign and manufacture, which increases the production cost and also affects the production efficiency and delivery cycle. At the same time, many tooling only fix both sides of the valve body. During welding, the valve body is prone to displacement due to thermal stress, mechanical vibration, etc., resulting in welding quality problems and affecting the product quality and benefits.

[0004] Moreover, the valve bodies not only have differences in size, but also the port orientations of various valve bodies are inconsistent. Therefore, the existing valve bodies can only clamp and limit a single type of valve body, and the applicability is low.

[0005] In short, the existing valve body welding tooling has problems in universality, fixing stability and adaptability, and innovative design is urgently needed to meet the development needs of industrial production.

[0006] Therefore, in view of the above statements, there is still room for optimization of the existing technology for the limiting tooling of valve bodies with different sizes. Summary of the Invention

[0007] To solve the above problems, the present invention provides a variable-size valve body welding tooling, including a bent plate and a valve body A. A supporting plate is slidably arranged on the vertical section of the bent plate. The valve body A is located at the upper end of the supporting plate. An inclined plate is arranged at the upper end of the bent plate, and the inclined plate is connected to the valve body A by means of bolt insertion.

[0008] L-shaped plates are symmetrically and slidably arranged on both sides of the supporting plate, and limiting components are also symmetrically arranged on the supporting plate.

[0009] Preferably, a sliding frame slidably connected to the bent plate is arranged on one side of the supporting plate. A plurality of circular grooves I are formed on the bent plate along its vertical section, and circular grooves II corresponding to the circular grooves I are also arranged on the sliding frame. A fixing bolt is commonly threadedly connected between the circular grooves I and the circular grooves II.

[0010] Preferably, a plurality of rectangularly distributed insertion slots are symmetrically formed in the supporting plate. Adjacent insertion slots are grouped together, and the two L-shaped plates are respectively connected to the adjacent group of insertion slots at the lower end by inserting bolts.

[0011] Preferably, a plurality of transverse slots are formed in the L-shaped plate along its extending section. A transverse limit bolt is inserted into one of the transverse slots of the L-shaped plate by means of threaded connection. A transverse limit block is slidably arranged on the outer side of the transverse limit bolt, and a transverse limit nut in contact with the transverse limit block is threadedly connected to the outer side of the transverse limit bolt.

[0012] Preferably, the front and rear transverse limit bolts respectively correspond to the front and rear ends of the valve body A, and the front and rear corresponding transverse limit blocks correspond to the inner wall of the valve body A.

[0013] Preferably, the limiting assembly includes limiting slots symmetrically formed on both sides of the supporting plate and distributed in a rectangular shape. A side limit bolt is arranged in one of the limiting slots in a group by means of threaded insertion. A side limit block is slidably arranged on the outer side of the side limit bolt, and a limit nut in contact with the side limit block is threadedly connected to the outer side of the side limit bolt.

[0014] Preferably, the inclined surface of the side limit block corresponds to the outer side of the valve body A.

[0015] Preferably, an inclined pipe is installed on the outer side of the valve body A. A flange is arranged at the port of the inclined pipe, and a plurality of fixing slots are formed in the inclined plate. The flange is connected to the fixing slots by inserting bolts; a plurality of central slots are formed in the inclined plate, and the central slots are connected to the insertion ports in the middle of the flange by inserting bolts.

[0016] Preferably, strip-shaped slots are also formed between adjacent fixing slots.

[0017] In addition, the present invention also provides a method for using a variable-size valve body welding tooling, including the following steps:

[0018] S1, position adjustment: Adjust the distance between the supporting plate and the inclined plate, place the valve body A on the supporting plate so that the valve body A corresponds to the inclined plate.

[0019] S2, upper and lower limiting: Connect the valve body A to the inclined plate by inserting bolts, then push the supporting plate to abut against the outer side of the valve body A, and limit the supporting plate on the bending plate.

[0020] S3, left and right limiting: Push the L-shaped plate to slide on the supporting plate so that it contacts the outer side of the valve body A, and limit the left and right outer sides of the valve body A by cooperating the limiting assembly with the L-shaped plate.

[0021] S4, Welding and Dismantling: After S1, S2, and S3 are completed, welding work is carried out on the valve body A. After welding is completed, the bolt insertion between the inclined plate and the flange is released, the L-shaped plate and the limiting component are driven to stop limiting the valve body A, and the valve body A is picked up from the supporting plate.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] First, through the sliding setting of the supporting plate on the bending plate and the cooperation with the inclined plate, the present invention can limit the valve body in the up and down directions for valve bodies of different sizes, ensuring that the valve body does not shake or displace in the up and down directions during welding. At the same time, the inclined plate can limit the top of the valve body through bolt insertion, providing stable up and down support for the valve body, ensuring the position accuracy of the valve body in the vertical direction, thus ensuring the stability of the up and down position of the valve body during the welding process and improving the welding quality.

[0024] Second, through the sliding setting of the L-shaped plate on the supporting plate, the mutual cooperation between the limiting component and the L-shaped plate, and the use of the horizontal limiting bolt, horizontal limiting block, side limiting bolt, side limiting block, etc., the present invention can flexibly adjust the position according to the size of the valve body, accurately limit the left and right and front and back sides of the valve body, effectively prevent position deviation of the valve body caused by size differences during welding, avoid the valve body from being skewed, enable valve bodies of different sizes and shapes to be well positioned and fixed, facilitate clamping of the inner and outer walls of the valve body, and improve the adaptability to valve bodies of different sizes and the accuracy of welding operations. Description of the Drawings

[0025] The present invention will be further described below with reference to the drawings and embodiments.

[0026] Figure 1 It is a schematic diagram of the main body structure of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of the supporting plate and the bending plate of the present invention.

[0028] Figure 3 It is a schematic diagram of the structure from another perspective of the present invention.

[0029] Figure 4 It is a schematic diagram of the distribution of the insertion slots and limiting slots on the supporting plate of the present invention.

[0030] Figure 5 It is a schematic diagram of the structure of the L-shaped plate of the present invention.

[0031] Figure 6 It is a schematic diagram of the structure of the horizontal limiting bolt and the horizontal limiting block of the present invention.

[0032] Figure 7 It is a schematic diagram of the structure of the limiting component of the present invention.

[0033] Figure 8 It is a schematic structural view of the inclined plate of the present invention.

[0034] Figure 9 It is a schematic structural view of valve body A of the present invention and the inclined pipe and flange outside it.

[0035] Figure 10 It is a schematic structural view of semi-circular groove 1 and semi-circular groove 2 of the present invention.

[0036] Figure 11 It is a schematic structural view of valve body B of the present invention.

[0037] Figure 12 It is a schematic structural view of valve body C of the present invention.

[0038] In the figure, 1, bending plate; 10, valve body A; 11, supporting plate; 12, inclined plate; 13, L-shaped plate; 2, sliding frame; 20, circular groove 1; 21, circular groove 2; 22, fixing bolt; 3, inserting groove; 30, transverse groove; 31, transverse limiting bolt; 32, transverse limiting block; 33, transverse limiting nut; 4, limiting component; 40, limiting groove; 41, side limiting bolt; 42, side limiting block; 43, limiting nut; 44, expanding groove; 5, inclined pipe; 50, flange; 51, fixing groove; 52, central groove; 53, strip-shaped groove; 6, valve body B; 60, semi-circular groove 1; 61, semi-circular groove 2; 62, valve body C. Detailed implementation manners

[0039] The following is combined with Figures 1 to 12 to describe the embodiments of the present invention in detail.

[0040] The embodiment of the present application discloses a variable-size valve body welding tooling and its using method. It should be noted that the present application is mainly applied in the process of welding the valve body. Technically, it can ensure to adapt to valve bodies of different sizes, provide stable support and accurate positioning; especially for the up-down, left-right and front-back directions of the valve body, accurate positioning can be achieved, aiming to eliminate the shaking, displacement or skew of the valve body during welding and ensure the welding accuracy; moreover, the present application can also properly fix the valve body with different port orientations (such as left-right orientation, up-down orientation), ensure that valve bodies of different structures and sizes can be stably placed on the tooling, and facilitate the welding operation; in actual operation, by means of sliding, inserting, threaded connection, etc., the valve body is ensured to be firmly fixed, improving the quality and efficiency of valve body welding and reducing the welding error and defective product rate caused by the unstable position of the valve body.

[0041] Embodiment 1: Refer to Figure 1 , Figure 2 and Figure 3As shown, it includes a bent plate 1, a valve body A10, a supporting plate 11, an inclined plate 12, an L-shaped plate 13 and a limiting component 4. A supporting plate 11 is slidably arranged on the vertical section of the bent plate 1, and the supporting plate 11 can slide up and down on the vertical section of the bent plate 1.

[0042] The valve body A10 is located at the upper end of the supporting plate 11. The supporting plate 11 is used to support the valve body A10 and can synchronously drive the valve body A10 to slide up and down.

[0043] An inclined plate 12 is arranged at the upper end of the bent plate 1. The inclined plate 12 is connected to the valve body A10 by bolt insertion. That is, the supporting plate 11 drives the valve body A10 to contact the inclined plate 12, so that the inclined plate 12 limits the valve body A10 by bolt insertion, and simultaneously supports and limits the lower end of the valve body through the supporting plate 11 to prevent the valve body A10 from shaking and displacing in the up and down directions during welding.

[0044] L-shaped plates 13 are symmetrically and slidably arranged on both sides of the supporting plate 11, and the L-shaped plates 13 can slide on the supporting plate 11.

[0045] Limiting components 4 are also symmetrically arranged on the supporting plate 11. The L-shaped plates 13 and the limiting components 4 are both in contact with the outer side of the valve body A10. The limiting components 4 can cooperate with the L-shaped plates 13 to limit the left and right sides of the valve body A10.

[0046] Continue to refer to Figure 2 and Figure 3 As shown, it includes a sliding frame 2, a first circular groove 20, a second circular groove 21 and a fixing bolt 22. The sliding frame 2 is arranged on one side of the supporting plate 11 and is slidably connected to the bent plate 1. That is, the supporting plate 11 can drive the sliding frame 2 to slide up and down on the vertical section of the bent plate 1, and the bent plate 1 can also limit the moving path of the supporting plate 11 through the sliding frame 2. It should be noted that during use, the end of the bent plate 1 is fixed and serves as the support base of the device.

[0047] A plurality of first circular grooves 20 are formed in the bent plate 1 along its vertical section. Second circular grooves 21 corresponding to the first circular grooves 20 are also provided on the sliding frame 2. A fixing bolt 22 is commonly connected in a threaded manner between the first circular groove 20 and the second circular groove 21. When the supporting plate 11 is driven by an external force to drive the sliding frame 2 to move, the second circular grooves 21 on the sliding frame 2 will respectively correspond to the plurality of first circular grooves 20. When the supporting plate 11 moves to a specified height, at this time, the fixing bolt 22 can be threaded into the second circular groove 21 and the corresponding first circular groove 20. Through the cooperation of the fixing bolt 22 with the corresponding first circular groove 20 and the circular groove, the supporting plate 11 is fixed on the bent plate 1. The supporting plate 11 can support the bottom of the valve body A10, so that the top of the valve body A10 can correspond to the inclined plate 12. Again, the top of the valve body A10 is limited by the inclined plate 12 in a bolt insertion manner, and the upper and lower ends of the valve body A10 can be limited and fixed.

[0048] Refer to Figure 4 、 Figure 5 and Figure 6 As shown, it includes a plugging groove 3, a transverse groove 30, a transverse limiting bolt 31, a transverse limiting block 32 and a transverse limiting nut 33. A plurality of plugging grooves 3 distributed in a rectangular shape are symmetrically formed on the supporting plate 11. Adjacent plugging grooves 3 are in a group. Two L-shaped plates 13 are respectively connected to a group of adjacent plugging grooves 3 at the lower end in a bolt insertion manner. That is, when the L-shaped plate 13 slides to a specified position, the L-shaped plate 13 can be connected to the plugging groove 3 by a bolt insertion manner to ensure the position of the L-shaped plate 13 is stable on the supporting plate 11. And during use, according to the outer diameter size of the valve body A10, the position of the L-shaped plate 13 is adjusted so that both L-shaped plates 13 are in contact with the outer side of the valve body A10, and then the L-shaped plate 13 can be fixed.

[0049] A plurality of transverse grooves 30 are formed in the L-shaped plate 13 and distributed along its extending section. A transverse limit bolt 31 is inserted into one of the transverse grooves 30 of the L-shaped plate 13 by means of threaded connection. A transverse limit block 32 is slidably arranged on the outer side of the transverse limit bolt 31. A transverse limit nut 33 which contacts the transverse limit block 32 is threadedly connected to the outer side of the transverse limit bolt 31. The front and rear transverse limit bolts 31 respectively correspond to the front and rear ends of the valve body A10. The front and rear corresponding transverse limit blocks 32 correspond to the inner wall of the valve body A10. The transverse limit bolt 31 can be threadedly inserted into the corresponding transverse groove 30, and the transverse limit block 32 can slide on the transverse limit bolt 31. One side of the transverse limit block 32 is rotationally inserted into the inner wall of one side of the valve body A10, and then the transverse limit nut 33 is rotated to contact the transverse limit bolt 31, so that the transverse limit bolt 31 contacts the inner wall of the valve body A10. The inner wall of the valve body is tightened by the transverse limit block 32. The transverse limit block 32 and the L-shaped plate 13 cooperate to clamp the inner and outer walls of the valve body A10, so as to limit one side of the valve body A10. After that, according to the different lengths of the valve body A10, the transverse limit bolt 31 is inserted into the corresponding transverse groove 30.

[0050] Continue to refer to Figure 4 and Figure 7 As shown, that is, a limit assembly 4 used to cooperate with the L-shaped plate 13 to limit the outer walls of both sides of the valve body A10; specifically, the limit assembly 4 includes a limit groove 40, a side limit bolt 41, a side limit block 42, a limit nut 43 and an expansion groove 44. The limit grooves 40 distributed in a rectangular shape are symmetrically formed on both sides of the support plate 11. A side limit bolt 41 is arranged in one of the limit grooves 40 in a group by means of threaded insertion. A side limit block 42 is slidably arranged on the outer side of the side limit bolt 41. The side limit block 42 can slide on the corresponding side limit bolt 41 when driven by an external force; a limit nut 43 which contacts the side limit block 42 is threadedly connected to the outer side of the side limit bolt 41. The inclined surface of the side limit block 42 corresponds to the outer side of the valve body A10. That is, in actual use, the side limit bolt 41 is threadedly inserted into the corresponding limit groove 40 according to the size of the valve body A10, so that the side limit nut corresponds to the front and rear sides of the valve body A10. Then, the two side limit bolts 41 are slid and driven to rotate to the inner wall of the valve body A10, and the limit nut 43 is rotated to tightly limit the side limit block 42, so that the end of the side limit block 42 can be tightly attached to the inner wall of the valve body A10. At this time, through the cooperation of the transverse limit block 32 and the side limit block 42, the left side and the lower inner wall of the valve body can be limited to prevent the valve body A10 from shaking during the welding work.

[0051] Moreover, a plurality of expansion slots 44 are symmetrically formed in the supporting plate 11. A pin shaft (not shown) is inserted into the expansion slot 44. That is, after the valve body A10 completes the above operation process, the pin shaft can be inserted into the corresponding expansion slot 44 so that the pin shaft corresponds to the two side ports of the valve body A10, and the length direction of the valve body A10 is limited by the pin shaft to prevent the valve body A10 from displacing in the front-back direction during welding.

[0052] Referring to Figure 8 and Figure 9 As shown, it includes an inclined pipe 5, a flange 50, a fixing slot 51, a central slot 52, and a strip slot 53. The inclined pipe 5 is installed outside the valve body A10, and a flange 50 is provided at the port of the inclined pipe 5. A plurality of fixing slots 51 are formed in the inclined plate 12, and the fixing slots 51 are connected to the flange 50 by means of bolt insertion. A plurality of central slots 52 are formed in the inclined plate 12, and the central slots 52 are connected to the insertion port in the middle of the flange 50 by means of bolt insertion. A strip slot 53 is also formed between adjacent fixing slots 51. That is, after the valve body A10 is limited by the supporting plate 11, the side limit block 42, the horizontal limit block 32, and the pin shaft, at this time, the flange 50 can be fixed by inserting the bolt into the fixing slot 51, and then the flange 50 can be further fixed by inserting the bolt into the central slot 52, so that the valve body A10 will not be skewed during welding. The remaining fixing slots 51 and strip slots 53 on the inclined plate 12 are for adapting to flanges 50 of various different sizes, so that the bolt can fix the flange 50 through the remaining fixing slots 51 and the inclined slots.

[0053] After valve bodies A10 of different sizes are placed on the supporting plate 11, due to different sizes, that is, the axis of the flange 50 on its inclined pipe 5 may not necessarily correspond to the central slot 52 in the middle. At this time, the bolt can be inserted into the central slot 52 corresponding to the flange 50 and then connected to the flange 50, so that the valve body A10 can be limited by the flange 50 and the inclined pipe 5.

[0054] Embodiment 2: Referring to Figure 10 , Figure 11 and Figure 12As shown in the figure, on the basis of Embodiment 1, in order to limit the valve body B6 with ports distributed left and right, several semi-circular grooves 60 are formed on the extension section of the bent plate 1, and several semi-circular grooves 61 corresponding to the semi-circular grooves 60 are also formed on the extension section. The valve body B6 is placed on the supporting plate 11, so that one side of the valve body B6 corresponds to the bent plate 1. The upper and lower corresponding semi-circular grooves 60 and semi-circular grooves 61 can limit the ports of the valve body B6 with different diameters. After the valve body B6 is placed on the supporting plate 11, the port on one side of the valve body B6 is inserted into the corresponding semi-circular grooves 60 and semi-circular grooves 61. The ports of the valve body B6 are limited by the semi-circular grooves 60 and semi-circular grooves 61. Then, in a threaded insertion manner, the inclined plate 12 is connected to the flange 50 on the valve body B6. In this way, the valve body B6 with ports facing left and right can be limited by the semi-circular grooves 60, semi-circular grooves 61, the supporting plate 11 and the inclined plate 12, so that the valve body B6 can be welded.

[0055] Furthermore, the present application can also limit the valve body C62 with ports facing up and down. The valve body C62 is placed on the supporting plate 11, so that the port on one side of the valve body C62 is in contact with the supporting plate 11. Then, the supporting plate 11 is moved so that the inclined pipe 5 of the valve body C62 corresponds to the inclined plate 12. The flange 50 on the inclined pipe 5 of the valve body C62 is fixed on the inclined plate 12 by bolt insertion. Therefore, the valve body C62 can be limited by the supporting plate 11 and the inclined plate 12, so that the valve body C62 can be stably welded.

[0056] In addition, the present invention also provides a method for using a variable-size valve body welding tooling, including the following steps:

[0057] S1, position adjustment: Adjust the distance between the supporting plate 11 and the inclined plate 12, and place the valve body A10 on the supporting plate 11 so that the valve body A10 corresponds to the inclined plate 12.

[0058] S2, upper and lower limit: Connect the inclined plate 12 and the flange 50 on the outer inclined pipe 5 of the valve body A10 by bolt insertion. Then, push the supporting plate 11 to abut against the outer side of the valve body A10, and limit the supporting plate 11 on the bent plate 1.

[0059] S3, left and right limit: Push the L-shaped plate 13 to slide on the supporting plate 11 so that it contacts the outer side of the valve body A10, and limit the left and right outer sides of the valve body A10 by cooperating with the L-shaped plate 13 through the limiting component 4.

[0060] S4, Welding and Dismantling: After the steps of S1, S2, and S3 are completed, welding work is carried out on the valve body A10. After the welding is completed, the bolt insertion between the inclined plate 12 and the flange 50 is released, and the L-shaped plate 13 and the limiting component 4 are driven to no longer limit the valve body A10, and the valve body A10 is picked up from the supporting plate 11.

[0061] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting.

[0062] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A variable-size valve body welding tooling, comprising a bending plate (1) and a valve body A (10), characterized in that: A supporting plate (11) is slidably arranged on the vertical section of the bent plate (1). The valve body A (10) is located at the upper end of the supporting plate (11). An inclined plate (12) is arranged at the upper end of the bent plate (1). The inclined plate (12) and the valve body A (10) are connected by means of bolt insertion; L-shaped plates (13) are symmetrically and slidably arranged on both sides of the supporting plate (11), and limiting components (4) are also symmetrically arranged on the supporting plate (11); Several semi-circular grooves one (60) are formed on the extending section of the bent plate (1), and several semi-circular grooves two (61) corresponding to the semi-circular grooves one (60) are also formed on the extending section; Several transverse grooves (30) distributed along its extending section are formed on the L-shaped plate (13). A transverse limiting bolt (31) is inserted into one of the transverse grooves (30) of the L-shaped plate (13) by means of threaded connection. A transverse limiting block (32) is slidably arranged on the outer side of the transverse limiting bolt (31). A transverse limiting nut (33) in contact with the transverse limiting block (32) is threadedly connected to the outer side of the transverse limiting bolt (31); The front and rear transverse limiting bolts (31) respectively correspond to the front and rear ends of the valve body A (10), and the front and rear corresponding transverse limiting blocks (32) correspond to the inner wall of the valve body A (10); The limiting component (4) includes limiting grooves (40) symmetrically formed on both sides of the supporting plate (11) and distributed in a rectangular shape. A side limiting bolt (41) is arranged in one of the limiting grooves (40) in a group by means of threaded insertion. A side limiting block (42) is slidably arranged on the outer side of the side limiting bolt (41). A limiting nut (43) in contact with the side limiting block (42) is threadedly connected to the outer side of the side limiting bolt (41); The inclined surface of the side limiting block (42) corresponds to the outer side of the valve body A (10).

2. The variable-size valve body welding tooling according to claim 1, wherein: A sliding frame (2) slidably connected to the bent plate (1) is arranged on one side of the supporting plate (11). Several circular grooves one (20) distributed along its vertical section are formed on the bent plate (1). Circular grooves two (21) corresponding to the circular grooves one (20) are also arranged on the sliding frame (2). A fixing bolt (22) is threadedly connected between the circular groove one (20) and the circular groove two (21).

3. The welding tooling for variable-size valve bodies according to claim 1, characterized in that: Several plugging grooves (3) distributed in a rectangular shape are symmetrically formed on the supporting plate (11). Adjacent several plugging grooves (3) form a group. The two L-shaped plates (13) and the adjacent group of plugging grooves (3) at the lower end are connected by means of bolt insertion; 4. The welding tooling for variable-size valve bodies according to claim 1, characterized in that: An inclined pipe (5) is installed on the outer side of the valve body A (10). A flange (50) is arranged at the port of the inclined pipe (5). Several fixing grooves (51) are formed on the inclined plate (12). The fixing grooves (51) are connected to the flange (50) by means of bolt insertion; several central grooves (52) are formed on the inclined plate (12). The central grooves (52) are connected to the insertion port in the middle of the flange (50) by means of bolt insertion.

5. A variable-size valve body welding tooling according to claim 4, characterized in that, A strip-shaped groove (53) is also formed between adjacent fixing grooves (51).

6. A method for using a welding tooling for variable-size valve bodies, which uses a welding tooling for variable-size valve bodies as described in any one of claims 1-5, characterized in that, The usage method includes the following steps: S1, position adjustment: Adjust the distance between the supporting plate (11) and the inclined plate (12), place the valve body A (10) on the supporting plate (11) so that the valve body A (10) corresponds to the inclined plate (12); S2, Upper and lower limit: Connect the valve body A (10) and the inclined plate (12) by inserting bolts, then push the supporting plate (11) to abut against the outer side of the valve body A (10), and limit the supporting plate (11) on the bent plate (1); S3, Left and right limit: Push the L-shaped plate (13) to slide on the supporting plate (11) so that it contacts the outer side of the valve body A (10), and limit the left and right outer sides of the valve body A (10) through the cooperation of the limiting component (4) and the L-shaped plate (13); S4, Welding and disassembly: After S1, S2 and S3 are completed, carry out the welding work on the valve body A (10). After the welding is completed, remove the bolt insertion between the inclined plate (12) and the flange (50), drive the L-shaped plate (13) and the limiting component (4) to no longer limit the valve body A (10), and pick up the valve body A (10) from the supporting plate (11).

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