Variable-size valve body welding tool and using method thereof

Abstract

The invention relates to the field of valve body welding tools, in particular to a variable-size valve body welding tool and a using method thereof.The variable-size valve body welding tool comprises a bent plate and a valve body A. A bearing plate is arranged on the vertical section of the bent plate in a sliding mode, the valve body A is located at the upper end of the bearing plate, an inclined plate is arranged at the upper end of the bent plate, and the inclined plate and the valve body A are connected in a bolt inserting mode; according to the valve body welding device, through sliding arrangement of the bearing plate on the bent plate and cooperation of the bearing plate and the inclined plate, valve bodies of different sizes can be limited in the vertical direction, it is ensured that the valve bodies cannot shake and move in the vertical direction during welding, the welding efficiency is improved, and the welding quality is improved. And meanwhile, the inclined plate can limit the top of the valve body in a bolt inserting mode, stable up-down supporting is provided for the valve body, the position precision of the valve body in the vertical direction is guaranteed, therefore, the stability of the up-down position of the valve body in the welding process is guaranteed, and the welding quality is improved.

Description

Technical Field

[0001] The invention relates to the field of valve body welding tooling, and in particular to a variable-size valve body welding tooling and a use method thereof. Background Art

[0002] In modern industry, valve bodies are the key to fluid control systems and are widely used in the fields of petroleum, chemical industry, etc. The quality of welding is related to the sealing and strength of the valve body and the safety of system operation, so efficient and accurate welding tools are extremely important. In the early days, valve bodies were welded manually, which was inefficient and of unstable quality, and it was difficult to meet the quality consistency requirements of large-scale production. With the development of the manufacturing industry, welding tools have emerged, which have improved welding efficiency and quality, but there are still limitations.

[0003] Most of the existing tooling can only limit and fix valve bodies of specific sizes. Valve bodies of different sizes need to be redesigned and produced, which increases production costs and affects production efficiency and delivery cycle. At the same time, many tooling only fixes the two sides of the valve body. During welding, the valve body is easily displaced due to thermal stress, mechanical vibration, etc., resulting in welding quality problems, affecting product quality and efficiency.

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

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

[0006] Therefore, based on the above-stated viewpoints, there is still room for optimization of the existing technology for limiting tooling for valve bodies of different sizes. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a variable-size valve body welding tool, including 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, and an inclined plate is arranged on the upper end of the bending plate. The inclined plate is connected to the valve body A by 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 is provided on one side of the supporting plate and is slidably connected to the bending plate, and the bending plate is provided with several circular grooves 1 distributed along its vertical section, and the sliding frame is also provided with a circular groove 2 corresponding to the circular groove 1, and a fixing bolt is threadedly connected between the circular grooves 1 and 2.

[0010] Preferably, the support plate is symmetrically provided with a plurality of rectangularly distributed plug-in slots, and a plurality of adjacent plug-in slots form a group. The two L-shaped plates are respectively connected to a group of adjacent plug-in slots at the lower end by bolt insertion.

[0011] Preferably, the L-shaped plate is provided with several transverse grooves distributed along its extension section, a transverse limit bolt is inserted into one of the transverse grooves of the L-shaped plate by means of a threaded connection, a transverse limit block is slidably arranged on the outside of the transverse limit bolt, and a transverse limit nut in contact with the transverse limit block is threadedly connected to the outside of the transverse limit bolt.

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

[0013] Preferably, the limit assembly includes limit grooves symmetrically opened on both sides of the support plate and distributed in a rectangular shape, a side limit bolt is arranged in one limit groove in a group by threaded insertion, a side limit block is slidingly arranged on the outer side of the side limit bolt, and the outer side of the side limit bolt is threadedly connected with a limit nut in contact with the side limit block.

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

[0015] Preferably, an inclined tube is installed on the outside of the valve body A, a flange is provided at the port of the inclined tube, and several fixing grooves are opened on the inclined plate, which are connected to the flange by bolt insertion; several center grooves are opened on the inclined plate, which are connected to the plug-in interface in the middle of the flange by bolt insertion.

[0016] Preferably, strip grooves are provided between adjacent fixing grooves.

[0017] In addition, the present invention also provides a method for using a variable-size valve body welding tool, comprising the following steps: S1, position adjustment: adjust the distance between the support plate and the inclined plate, and place the valve body A on the support plate so that the valve body A corresponds to the inclined plate.

[0018] S2, upper and lower limit: connect the valve body A and the inclined plate by bolting, then push the supporting plate to press against the outer side of the valve body A, and limit the supporting plate on the bending plate.

[0019] S3, left and right limit: 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 through the limit assembly and the L-shaped plate.

[0020] S4, welding disassembly: After S1, S2 and S3 are completed, the valve body A is welded. After welding is completed, the bolts between the inclined plate and the flange are released, so that the L-shaped plate and the limit assembly no longer limit the valve body A, and the valve body A is lifted from the supporting plate.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present invention can limit the valve bodies of different sizes in the up and down directions through the sliding setting of the support plate on the bending plate and the cooperation with the inclined plate, ensuring that the valve body will not shake or move in the up and down directions during welding. At the same time, the inclined plate can limit the top of the valve body by bolt insertion, providing stable up and down support for the valve body, ensuring the position accuracy of the valve body in the vertical direction, thereby ensuring the stability of the up and down position of the valve body during welding and improving the welding quality.

[0022] 2. The present invention can flexibly adjust the position according to the size of the valve body through the sliding setting of the L-shaped plate on the supporting plate, the mutual cooperation of the limit assembly and the L-shaped plate, and the use of transverse limit bolts, transverse limit blocks, side limit bolts, side limit blocks, etc., and accurately limit the left and right sides and front and back sides of the valve body, which can effectively prevent the position deviation of the valve body caused by size difference during welding and avoid the valve body from tilting, so that valve bodies of different sizes and shapes can be well positioned and fixed, and the inner and outer walls of the valve body can be clamped conveniently, thereby improving the adaptability to valve bodies of different sizes and the accuracy of welding operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a schematic diagram of the main body structure of the present invention.

[0025] Figure 2 It is a structural schematic diagram of the supporting plate and the bending plate of the present invention.

[0026] Figure 3 It is a structural schematic diagram of the present invention from another perspective.

[0027] Figure 4 It is a distribution diagram of the plug-in slots and the limit slots on the supporting plate of the present invention.

[0028] Figure 5 It is a structural schematic diagram of the L-shaped plate of the present invention.

[0029] Figure 6 It is a structural schematic diagram of the cross limit bolt and the cross limit block of the present invention.

[0030] Figure 7 It is a structural schematic diagram of the limiting component of the present invention.

[0031] Figure 8 It is a structural schematic diagram of the inclined plate of the present invention.

[0032] Fig. 9 It is a schematic structural diagram of the valve body A of the present invention and the oblique tube and flange on its outer side.

[0033] Fig.10 It is a structural schematic diagram of the semicircular groove 1 and the semicircular groove 2 of the present invention.

[0034] Fig.11 It is a structural schematic diagram of the valve body B of the present invention.

[0035] Fig.12 It is a structural schematic diagram of the valve body C of the present invention.

[0036] 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 one; 21, circular groove two; 22, fixing bolt; 3, plug-in groove; 30, transverse groove; 31, transverse limit bolt; 32, transverse limit block; 33, transverse limit nut; 4, limit assembly; 40, limit groove; 41, side limit bolt; 42, side limit block; 43, limit nut; 44, expansion groove; 5, inclined pipe; 50, flange; 51, fixing groove; 52, center groove; 53, strip groove; 6, valve body B; 60, semicircular groove one; 61, semicircular groove two; 62, valve body C. DETAILED DESCRIPTION

[0037] The following combination Figures 1 to 12 Embodiments of the present invention are described in detail.

[0038] The embodiment of the present application discloses a variable-size valve body welding tool and a method of using the same, which explains that the present application is mainly used in the process of welding valve bodies, and technically ensures that it can adapt to valve bodies of different sizes, provide stable support and precise positioning; in particular, accurate positioning of the valve body in the up and down, left and right, and front and back directions can be achieved, aiming to eliminate the shaking, displacement or skewness of the valve body during welding, and ensure welding accuracy; and, the present application can also appropriately fix valve bodies with different port orientations (such as left and right orientations, up and down orientations), ensure that valve bodies of different structures and sizes can be stably placed on the tool, and facilitate welding operations; in actual operations, sliding, plug-in, threaded connection and other methods are used to ensure that the valve body is firmly fixed, thereby improving the quality and efficiency of valve body welding and reducing welding errors and defective product rates caused by unstable valve body position.

[0039] Example 1: Reference Figure 1 , Figure 2 and Figure 3As shown, it includes a bending plate 1, a valve body A10, a supporting plate 11, an inclined plate 12, an L-shaped plate 13 and a limit assembly 4. The supporting plate 11 is slidably arranged on the vertical section of the bending plate 1, and the supporting plate 11 can slide up and down on the vertical section of the bending plate 1.

[0040] 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 simultaneously drive the valve body A10 to slide in the up and down directions.

[0041] An inclined plate 12 is provided at the upper end of the bending plate 1, and 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, so as to prevent the valve body A10 from shaking and displacing in the up and down directions during welding.

[0042] L-shaped plates 13 are symmetrically and slidably provided on both sides of the supporting plate 11 , and the L-shaped plates 13 can slide on the supporting plate 11 .

[0043] The support plate 11 is also symmetrically provided with a limit assembly 4. Both the L-shaped plate 13 and the limit assembly 4 are in contact with the outer side of the valve body A10. The limit assembly 4 can cooperate with the L-shaped plate 13 to limit the left and right sides of the valve body A10.

[0044] Continue to refer to Figure 2 and Figure 3 As shown, it includes a sliding frame 2, a circular groove 1 20, a 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 bending 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 bending plate 1, and the bending 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 bending plate 1 is fixed and stationary, which serves as the supporting basis of the device.

[0045] The bending plate 1 is provided with a plurality of circular grooves 20 distributed along its vertical section, and the sliding frame 2 is also provided with a circular groove 21 corresponding to the circular groove 20. The circular grooves 20 and the circular grooves 21 are threadedly connected with each other by fixing bolts 22. When the supporting plate 11 is driven by an external force to drive the sliding frame 2 to move, the circular grooves 21 on the sliding frame 2 will correspond to the plurality of circular grooves 20 respectively. When the supporting plate 11 moves to a specified height, the fixing bolts 22 can be used to fix the supporting plate 11. The thread is inserted into the circular groove 21 and the corresponding circular groove 1 20, and the support plate 11 is fixed on the bending plate 1 through the cooperation of the fixing bolt 22 with the corresponding circular groove 1 20 and the circular groove. The support 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, and the top of the valve body A10 is limited by the inclined plate 12 through bolt insertion, so that the upper and lower ends of the valve body A10 can be limited and fixed.

[0046] Reference Figure 4 , Figure 5 and Figure 6 As shown, it includes a plug-in slot 3, a transverse slot 30, a transverse limit bolt 31, a transverse limit block 32 and a transverse limit nut 33. A plurality of plug-in slots 3 distributed in a rectangular shape are symmetrically provided on the support plate 11. A plurality of adjacent plug-in slots 3 form a group. Two L-shaped plates 13 are respectively connected to a group of adjacent plug-in slots 3 at the lower end by bolt plugging. That is, when the L-shaped plate 13 slides to the specified position, the L-shaped plate 13 can be connected to the plug-in slot 3 by bolt plugging, ensuring that the position of the L-shaped plate 13 on the support plate 11 is stable. During use, the position of the L-shaped plate 13 is adjusted by the outer diameter of the valve body A10 so that the two L-shaped plates 13 are in contact with the outer side of the valve body A10, thereby fixing the L-shaped plate 13.

[0047] The L-shaped plate 13 is provided with a plurality of transverse grooves 30 distributed along its extension 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 in contact with 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 correspond to the front and rear ends of the valve body A10 respectively. The corresponding front and rear 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 is threadedly arranged on the outer side of the transverse limit bolt 31. 2 can slide on the transverse limit bolt 31, rotate one side of the transverse limit block 32 and insert it into the inner wall of one side of the valve body A10, then rotate the transverse limit nut 33 to contact the transverse limit bolt 31, so that the transverse limit bolt 31 contacts the inner wall of the valve body A10, and the transverse limit block 32 is pressed against the inner wall of the valve body, and the transverse limit block 32 and the L-shaped plate 13 are clamped and matched with the inner and outer walls of the valve body A10, so that one side of the valve body A10 can be limited, and then, according to the different lengths of the valve body A10, the transverse limit bolt 31 can be inserted into the corresponding transverse groove 30.

[0048] Continue to refer to Figure 4 and Figure 7 As shown, the limiting assembly 4 is used to cooperate with the L-shaped plate 13 to limit the outer walls on both sides of the valve body A10; specifically, the limiting assembly 4 includes a limiting groove 40, a side limiting bolt 41, a side limiting block 42, a limiting nut 43 and an expansion groove 44, and the limiting grooves 40 distributed in a rectangular shape are symmetrically arranged on both sides of the supporting plate 11. A side limiting bolt 41 is arranged in a limiting groove 40 in a group by threaded insertion, and a side limiting block 42 is slidably arranged on the outer side of the side limiting bolt 41. The side limiting block 42 can slide on the corresponding side limiting bolt 41 when driven by external force; the outer side of the side limiting bolt 41 is threadedly connected with a limiting nut 43 in contact with the side limiting block 42, 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, and then the side limit bolts 41 on both sides are driven to rotate to the inner wall of the valve body A10 by sliding, and the limit nut 43 is rotated to tighten 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, the left side and the lower inner wall of the valve body can be limited by the cooperation of the cross limit block 32 and the side limit block 42 to prevent the valve body A10 from shaking during welding.

[0049] In addition, the support plate 11 is symmetrically provided with several expansion grooves 44, and the expansion grooves 44 are used to insert pins (not shown). That is, when the valve body A10 completes the above-mentioned operation process, the pins can be inserted into the corresponding expansion grooves 44, so that the pins correspond to the ports on both sides of the valve body A10, and the length direction of the valve body A10 is limited by the pins to prevent the valve body A10 from being displaced in the front and rear directions during welding.

[0050] Reference Figure 8 and Fig. 9 As shown, it includes an inclined tube 5, a flange 50, a fixing groove 51, a center groove 52 and a strip groove 53. The inclined tube 5 is installed on the outside of the valve body A10, and the port of the inclined tube 5 is provided with a flange 50. A plurality of fixing grooves 51 are provided on the inclined plate 12, and the fixing grooves 51 are connected to the flange 50 by bolt plugging. A plurality of center grooves 52 are provided on the inclined plate 12, and the center grooves 52 are connected to the plug interface in the middle of the flange 50 by bolt plugging. A strip groove 53 is also provided between adjacent fixing grooves 51. That is, when the valve body A10 is After 10 is limited by the support plate 11, the side limit block 42, the cross limit block 32 and the pin shaft, the flange 50 can be fixed by inserting the bolts in the fixing grooves 51, and then the flange 50 is further fixed by inserting the bolts in the central groove 52, so that the valve body A10 will not be skewed during welding, and the remaining fixing grooves 51 and the strip grooves 53 on the inclined plate 12 are for adapting to flanges 50 of various sizes, so that the bolts can fix the flange 50 through the remaining fixing grooves 51 and the inclined grooves.

[0051] After the valve bodies A10 of different sizes are placed on the supporting plate 11, due to the different sizes, that is, the axis of the flange 50 on the inclined tube 5 does not necessarily correspond to the central groove 52 in the middle. At this time, the bolts can be inserted into the central groove 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 tube 5.

[0052] Example 2: Reference Fig.10 , Fig.11 and Fig.12As shown, on the basis of the first embodiment, in order to limit the valve body B6 with ports distributed on the left and right, a plurality of semicircular grooves 1 60 are provided on the extension section of the bent plate 1, and a plurality of semicircular grooves 2 61 corresponding to the semicircular grooves 1 60 are also provided 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, and the semicircular grooves 1 60 and the semicircular grooves 2 61 corresponding to the upper and lower sides can limit the ports of the valve body B6 with different diameters, so that the valve body B6 After being placed on the supporting plate 11, the port on one side of the valve body B6 is inserted into the corresponding semicircular groove 1 60 and the semicircular groove 2 61, and the port of the valve body B6 is limited by the semicircular groove 1 60 and the semicircular groove 2 61. Then, the inclined plate 12 is connected to the flange 50 on the valve body B6 by threaded insertion. In this way, the valve body B6 with the port facing left and right can be limited by the semicircular groove 1 60, the semicircular groove 2 61, the supporting plate 11 and the inclined plate 12, so that the valve body B6 can be welded.

[0053] Furthermore, the present application can also limit the valve body C62 whose ports are facing up and down, and place the valve body C62 on the support plate 11 so that the port on one side of the valve body C62 contacts the support plate 11, and then move the support plate 11 so that the inclined tube 5 of the valve body C62 corresponds to the inclined plate 12, and fix the flange 50 on the inclined tube 5 of the valve body C62 to the inclined plate 12 by bolting. Therefore, the valve body C62 can be limited by the support plate 11 and the inclined plate 12, so that the valve body C62 can be stably welded.

[0054] In addition, the present invention also provides a method for using a variable-size valve body welding tool, comprising the following steps: 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.

[0055] S2, upper and lower limit: connect the inclined plate 12 to the flange 50 on the inclined tube 5 outside the valve body A10 by bolt insertion, then push the supporting plate 11 to press against the outside of the valve body A10, and limit the supporting plate 11 on the bending plate 1.

[0056] S3, left and right limiting: 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 through the limiting component 4 cooperating with the L-shaped plate 13.

[0057] S4, welding disassembly: After completing steps S1, S2 and S3, the valve body A10 is welded. After welding is completed, the bolts between the inclined plate 12 and the flange 50 are released, so that the L-shaped plate 13 and the limiting assembly 4 no longer limit the valve body A10, and the valve body A10 is lifted from the supporting plate 11.

[0058] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered as exemplary and non-restrictive in all respects.

[0059] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A variable-size valve body welding tool, comprising a bent plate (1) and a valve body A (10), characterized in that: A supporting plate (11) is slidably arranged on the vertical section of the bending 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 bending plate (1), and the inclined plate (12) and the valve body A (10) are connected by bolt insertion; L-shaped plates (13) are symmetrically slidably arranged on both sides of the support plate (11), and a limit position assembly (4) is also symmetrically arranged on the support plate (11).

2. A variable size valve body welding tool according to claim 1, characterized in that: A sliding frame (2) is provided on one side of the supporting plate (11) and is slidably connected to the bending plate (1). The bending plate (1) is provided with a plurality of circular grooves (20) distributed along its vertical section. The sliding frame (2) is also provided with circular grooves (21) corresponding to the circular grooves (20). A fixing bolt (22) is threadedly connected between the circular grooves (20) and the circular grooves (21).

3. The variable-size valve body welding tool according to claim 1, characterized in that: The support plate (11) is symmetrically provided with a plurality of rectangularly distributed plug-in slots (3), wherein a plurality of adjacent plug-in slots (3) form a group, and the two L-shaped plates (13) are respectively connected to a group of adjacent plug-in slots (3) at the lower end by bolt plugging.

4. The variable-size valve body welding tool according to claim 1, characterized in that: The L-shaped plate (13) is provided with a plurality of transverse grooves (30) distributed along its extended section. A transverse limit bolt (31) is inserted into one of the transverse grooves (30) of the L-shaped plate (13) by means of a threaded connection. A transverse limit block (32) is slidably arranged outside the transverse limit bolt (31). A transverse limit nut (33) in contact with the transverse limit block (32) is threadedly connected to the outside of the transverse limit bolt (31).

5. A variable-size valve body welding tool according to claim 4, characterized in that: The two front and rear transverse limit bolts (31) correspond to the front and rear ends of the valve body A (10) respectively, and the front and rear corresponding transverse limit blocks (32) correspond to the inner wall of the valve body A (10).

6. The variable-size valve body welding tool according to claim 1, characterized in that: The limiting assembly (4) comprises limiting grooves (40) symmetrically arranged on both sides of the support plate (11) and distributed in a rectangular shape, a side limiting bolt (41) being arranged in a limiting groove (40) in a group by means of threaded insertion, a side limiting block (42) being slidably arranged on the outer side of the side limiting bolt (41), and a limiting nut (43) in contact with the side limiting block (42) being threadedly connected to the outer side of the side limiting bolt (41).

7. A variable size valve body welding tool according to claim 6, characterized in that: The inclined surface of the side limit block (42) corresponds to the outer side of the valve body A (10).

8. The variable-size valve body welding tool according to claim 1, characterized in that: An inclined tube (5) is installed on the outside of the valve body A (10), and a flange (50) is provided at the end of the inclined tube (5). A plurality of fixing grooves (51) are provided on the inclined plate (12), and the fixing grooves (51) are connected to the flange (50) by bolt insertion. A plurality of central grooves (52) are provided on the inclined plate (12), and the central grooves (52) are connected to the insertion interface in the middle of the flange (50) by bolt insertion.

9. A variable size valve body welding tool according to claim 8, characterized in that: A strip groove (53) is further provided between adjacent fixing grooves (51).

10. A method for using a variable-size valve body welding tool, using a variable-size valve body welding tool as claimed in any one of claims 1 to 9, characterized in that: The method of use includes the following steps: S1, position adjustment: adjusting the distance between the supporting plate (11) and the inclined plate (12), placing 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 bolting, then push the supporting plate (11) to press 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 limit assembly (4) cooperating with the L-shaped plate (13); S4, welding disassembly: After S1, S2 and S3 are completed, the valve body A (10) is welded. After welding is completed, the bolts between the inclined plate (12) and the flange (50) are released, so that the L-shaped plate (13) and the limit assembly (4) no longer limit the valve body A (10), and the valve body A (10) is lifted from the supporting plate (11).

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