Welding tool for manufacturing large marine valve

Abstract

The invention relates to the technical field of valve welding, in particular to a welding tool for manufacturing a large marine valve. Workpiece positioning structures used for clamping and positioning valve workpieces are symmetrically assembled at the upper end of the welding tool frame along the middle portion. A welding seam bottom sealing structure for sealing the position of a welding seam in a valve workpiece is detachably assembled on the inner side of each workpiece positioning structure. According to the design of the welding seam bottom sealing structure, the inner space of the inner edge of the welding seam can be automatically sealed through the synergistic effect of the oblique angle groove plate, the assembly frame plate, the arc-shaped plate and other components, and in the process, the assembly frame plate moves on the oblique angle groove plate, so that a sealed metal circular ring is formed; according to the design, welding fluid is effectively prevented from leaking into the valve workpiece in the welding process, the wall thickness welding quality of the valve for the large ship is ensured, and therefore welding defects are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of valve welding, in particular to a welding tool for manufacturing large-scale ship valves. Background Art

[0002] Large marine valves are key equipment in ship piping systems, used to control fluid pressure, flow and flow direction to ensure the normal operation of various ship systems. In the field of large marine valve manufacturing, the quality and efficiency of the welding process directly affect the service life of the valves.

[0003] For the internal welds of large marine valves, especially large marine valves, due to the wall thickness, a larger weld needs to be retained during welding to accommodate the welding gun extending into the weld to weld the inner walls of the two. During the welding process, a stable weld pool cannot be formed inside the weld, resulting in weak welding and easy occurrence of pores. At the same time, without reliable bottom sealing measures, welding slag can easily fall into the valve, contaminating the internal structure of the valve, affecting the normal opening and closing of the valve and the flow of media, and increasing maintenance costs.

[0004] Therefore, those skilled in the art provide a welding tool for manufacturing large-scale marine valves to solve the problems raised in the above background technology. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides: A welding tool for manufacturing large-scale marine valves, comprising: a welding tool frame; The upper end of the welding fixture frame is symmetrically equipped with a workpiece positioning structure for clamping and positioning the valve workpiece along the middle; A weld bottom sealing structure for sealing the internal weld position of the valve workpiece is detachably mounted on the inner side of the single workpiece positioning structure; The weld bottom sealing structure includes a positioning plate and a concentrically fixed limiting rod, and two sets of bevel groove plates 1 and 2 are fixed to the end of the limiting rod away from the positioning plate; An assembly frame plate is slidably arranged in the first bevel groove plate and the second bevel groove plate.

[0006] Preferably, one end of the bevel slot plate is provided with an extension slot for corresponding extension and movement of the assembly frame plate, and a reset inner block is slidably provided inside the assembly frame plate, and a reset spring is elastically sleeved between the reset inner block and the assembly frame plate; An assembly rod is fixed to the upper end of the reset inner block, and a slot plate which is closed in one direction is fixed to the upper end of the assembly rod as a whole, and an arc plate which is provided for sealing the weld seam is provided on the slot plate in a transversely sliding manner; There are four arc-shaped plates in total, which are tightly attached to each other to form a metal ring that seals the inner edge of the valve member along the weld.

[0007] Preferably, an adjustment slot is provided inside the limit rod, and a reciprocating push plate is slidably provided inside the adjustment slot and sleeved on the outside of the limit rod. The reciprocating push plate and the limit rod are concentrically connected and spirally driven to provide a reciprocating screw rod rotating inside the adjustment slot. One end of the reciprocating screw is connected to a brushless motor fixed on the inner side of the positioning plate.

[0008] Preferably, a reset groove is provided in a cross shape on the inner side of the reciprocating push plate at positions corresponding to the four assembly rack plates, and one end of the assembly rack plate slides vertically inside the reset groove, and a tension spring is elastically installed between the assembly rack plate and the reset groove.

[0009] Preferably, a push screw is integrally fixed to one end of the positioning plate away from the limiting rod, and a limiting arc plate integrally fixed to the positioning plate is provided on the outer side of the pushing screw.

[0010] Preferably, the workpiece positioning structure includes a clamping frame, and the clamping frame is integrally fixed with a limiting arc frame that is movable and limited inside the welding fixture frame; An external threaded cylinder and an internal threaded cylinder are rotatably mounted on the side wall of the clamping frame.

[0011] Preferably, the inner side of the internal threaded barrel is spirally driven with the push screw, and a helical gear three is fixedly mounted on the outer side of one end of the internal threaded barrel, and the helical gear three is meshed with a helical gear four.

[0012] Preferably, a second assembly shaft frame is rotatably mounted on the outer side of the fourth bevel gear, and a second linear cylinder is mounted on the outer side of the second assembly shaft frame.

[0013] Technical effects and advantages of the present invention: The present invention utilizes the synergistic effect of multiple components such as the bevel groove plate, the assembly frame plate, and the curved plate to automatically seal the internal space along the inner edge of the weld. During this process, the assembly frame plate moves on the bevel groove plate, which enables the curved plate to accurately fit the inner edge weld of the valve component, thereby forming a sealed metal ring. The formed metal ring and the weld of the valve workpiece form a weld pool. This design effectively prevents leakage of welding liquid into the interior of the valve workpiece during welding, ensures the quality of welding of thick-walled large-scale marine valves, and thus avoids the occurrence of welding defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a welding tool for manufacturing large marine valves provided by this application; Figure 2 This is a schematic diagram of the front structure of a welding tool for manufacturing large marine valves provided by this application; Figure 3This is a schematic diagram of the three-dimensional structure of the weld bottom sealing structure in a welding tool for manufacturing large marine valves provided by the present application; Figure 4 This is a schematic structural diagram of the side surface of the weld bottom sealing structure in a welding tool for manufacturing large marine valves provided by the present application; Figure 5 This is a schematic cross-sectional view of a weld bottom sealing structure in a welding tool for manufacturing large marine valves provided by the present application; Figure 6 This is a schematic diagram of the arc-shaped plate assembly structure of the weld bottom sealing structure in a welding tool for manufacturing large marine valves provided by the present application; Figure 7 This is a schematic structural diagram of the formation of a welding pool in a welding tool for manufacturing large marine valves provided by the present application; Figure 8 This is a schematic structural diagram of a workpiece positioning structure in a welding tool for manufacturing large marine valves provided by the present application; Figure 9 This application provides a welding tool for manufacturing large marine valves Figure 8 Schematic diagram of the structure of the source A.

[0015] In the picture: 1. Welding fixture frame; 2. Welding seam bottom sealing structure; 201. Positioning plate; 202. Limiting rod; 203. Adjusting slot; 204. Bevel slot plate 1; 205. Bevel slot plate 2; 206. Extension slot; 207. Reciprocating screw; 208. Brushless motor; 209. Reciprocating push plate; 210. Reset slot; 211. Tension spring; 212. Assembly frame plate; 213. Assembly rod; 214. Slot plate; 215. Arc plate; 216. Push screw; 217. Limiting arc plate; 218. Reset inner block; 219. Reset spring; 3. Workpiece positioning structure; 301. Clamping frame; 302. Screw clamping rod; 303. Limiting arc frame; 304. Externally threaded barrel; 305. Internally threaded barrel; 306. Bevel gear 1; 307. Bevel gear 2; 308. Assembly shaft frame 1; 309. Linear cylinder 1; 310. Bevel gear 3; 311. Bevel gear 4; 312. Assembly shaft frame 2; 313. Transmission square rod; 314. Servo motor 2; 315. Linear cylinder 2; 4. Welding top frame; 5. Side shaft collar; 6. Welding ring; 7. External gear ring; 8. Spur gear; 9. Servo motor 1; 10. Linear electric cylinder; 11. Welding gun head; 12. Air supply pipe; 13. Air supply shaft collar; 14. Connecting pipe; 15. Controller. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The examples of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for specific applications.

[0017] For example 1, please refer to Figures 1 and 2 In this embodiment, a welding tool for manufacturing large marine valves is provided, comprising: a welding tool frame 1; a workpiece positioning structure 3 for clamping and positioning a valve workpiece is symmetrically mounted along the middle of the upper end of the welding tool frame 1; the workpiece positioning structure 3 is used to clamp the large marine valve workpiece to be welded, so that the weld seams are axially aligned to form a weldable weld seam; a weld bottom sealing structure 2 for sealing the internal weld position of the valve workpiece is detachably mounted on the inner side of each workpiece positioning structure 3; The weld bottom sealing structure 2 can seal the weld formed by clamping the large marine valve workpiece to be welded through the workpiece positioning structure 3 from the inside; a welding top frame 4 is movably provided on the top of the welding fixture frame 1, and an electric telescopic cylinder is installed between one end of the welding top frame 4 and the welding fixture frame 1; a side shaft ring 5 is drilled and installed on the inner side of the middle part of the welding top frame 4, and a welding ring 6 is rotatably installed on the inner side of the side shaft ring 5, and a number of installation stations are fixed at equal distances in a ring shape on the inner edge of the welding ring 6, and a linear electric cylinder 10 is detachably installed on each of the installation stations, and a welding gun head 11 for welding the valve workpiece is installed at the output end of the linear electric cylinder 10; An outer gear ring 7 is fixed to the outer edge of the welding ring 6, and the outer gear ring 7 is meshed with a spur gear 8, and the spur gear 8 is connected to a servo motor 9; the servo motor 9 is fixedly assembled on the welding top frame 4, and the servo motor 9 is used to actively drive the spur gear 8 to rotate. The rotating spur gear 8 meshes with the outer gear ring 7, rotating the welding ring 6, which is beneficial to the annular surrounding welding of the valve component; The welding gun head 11 is connected to a gas supply pipe 12 for gas and oxygen supply, and the end of the gas supply pipe 12 away from the welding gun head 11 is connected to a gas supply collar 13, and the middle part of the gas supply collar 13 is a collar set for sealing rotation, and the collar is connected to a connecting pipe 14 connected to an external oxygen supply bottle and an external gas welding bottle; a controller 15 is installed on the side of the welding tool frame 1.

[0018] For example 2, please refer to Figures 3 to 7 In this embodiment, a weld bottom sealing structure 2 in a welding tool for manufacturing large marine valves is provided; The weld bottom sealing structure 2 includes a positioning plate 201 and a concentrically fixed limiting rod 202. Two sets of beveled slot plates 1 204 and 205 are fixed to the end of the limiting rod 202 away from the positioning plate 201. The beveled slot plates 1 204 and 205 are fixedly assembled on the outer wall of the limiting rod 202 in a cross shape. An assembly frame plate 212 is slidably provided in the beveled slot plates 1 204 and 205. When the assembly rack plate 212 moves along the beveled slot plate 1 204, it first passes through the inclined surface position of the beveled slot plate 1 204 and the beveled slot plate 205, so that the assembly rack plate 212 gradually moves to the same horizontal position of the beveled slot plate 1 204 and the beveled slot plate 205; an extension slot 206 is formed through one end of the beveled slot plate 1 204 for corresponding extension and movement of the assembly rack plate 212, and a reset inner block 218 is slidably provided inside the assembly rack plate 212, and a reset spring 219 is elastically sleeved between the reset inner block 218 and the assembly rack plate 212; the reset spring 219 is used to elastically reset the position of the reset inner block 218 inside the assembly rack plate 212; An assembly rod 213 is fixed to the upper end of the reset inner block 218, and a slot plate 214 that is closed in one direction is integrally fixed to the upper end of the assembly rod 213. An arc plate 215 that is provided to seal the weld seam is provided on the slot plate 214 in a transversely sliding manner. The arc plates 215 are grouped in two groups. The two groups of arc plates 215 are sequentially pushed toward the weld seam of the valve member and brought into close proximity, so that the four arc plates 215 in the two groups are provided in a circular ring shape on the weld seam along the inner edge of the valve member. There are four arc-shaped plates 215 in total, which are tightly attached to each other to form a metal ring sealed along the weld inside the valve member; an adjustment groove 203 is provided inside the limit rod 202, and a reciprocating push plate 209 is slidably provided inside the adjustment groove 203 and sleeved on the outside of the limit rod 202. The reciprocating push plate 209 and the limit rod 202 are concentrically positioned and spirally driven to rotate a reciprocating screw 207 located inside the adjustment groove 203; a spiral transmission relationship is formed between the reciprocating screw 207 and the reciprocating push plate 209. When the reciprocating screw 207 actively rotates, the reciprocating push plate 209 is spirally driven, so that the reciprocating screw 207 moves along the reciprocating screw 207 inside the adjustment groove 203 on the outside of the limit rod 202 to adjust the push position; One end of the reciprocating screw 207 is connected to a brushless motor 208 fixed on the inner side of the positioning plate 201; the brushless motor 208 is used to actively drive the reciprocating screw 207 to rotate; the inner side of the reciprocating push plate 209 is provided with a reset groove 210 in a cross shape at positions corresponding to the four assembly rack plates 212, and one end of the assembly rack plate 212 is vertically slidable on the inner side of the reset groove 210, and a tension spring 211 is elastically installed between the assembly rack plate 212 and the reset groove 210; A limiting slide rod is fixed on the inner side of the reset groove 210, and a vertical shaft sleeve is installed on the position of the assembly frame plate 212 corresponding to the limiting slide rod. The assembly frame plate 212 is slidably sleeved on the limiting slide rod through the vertical shaft sleeve, and is elastically reset by the tension spring 211; a push screw 216 is integrally fixed to the end of the positioning plate 201 away from the limiting rod 202, and a limiting arc plate 217 is provided on the outer side of the push screw 216 and is integrally fixed to the positioning plate 201.

[0019] For example three, please refer to Figures 8 and 9 In this embodiment, a workpiece positioning structure 3 in a welding tool for manufacturing large marine valves is provided; The workpiece positioning structure 3 includes a clamping frame 301, and the clamping frame 301 is integrally fixed with a limiting arc frame 303 that is movable and limited inside the welding fixture frame 1; the limiting arc frame 303 is arranged inside the welding fixture frame 1 for transverse movement; the side wall of the clamping frame 301 is rotatably mounted with an external threaded cylinder 304 and an internal threaded cylinder 305; The inner side of the internal threaded barrel 305 is provided with a spiral transmission arrangement with the push screw 216, and a bevel gear 310 is fixedly mounted on the outer side of one end of the internal threaded barrel 305, and the bevel gear 310 is meshed with a bevel gear 4 311; a rotation arrangement is provided between the internal threaded barrel 305 and the external threaded barrel 304; an assembly shaft frame 2 312 is rotatably mounted on the outer side of the bevel gear 4 311, and a linear cylinder 2 315 is mounted on the outer side of the assembly shaft frame 2 312; the linear cylinder 2 315 is used to push the position of the bevel gear 4 311 assembled on the assembly shaft frame 2 312 so that the bevel gear 4 311 can be separated from or meshed with the bevel gear 3 310; The clamping frame 301 is provided with three extension arc frames at equal distances in a ring shape, and screw clamping rods 302 are adjustable on the inner sides of the extension arc frames. The screw clamping rods 302 and the extension arc frames are positioned by spiral locking. The screw clamping rods 302 and the extension arc frames are in a vertical spiral transmission state, and the screw clamping rods 302 can be rotated to move along the extension arc frames to clamp and position the valve workpiece, which is convenient for welding. A bevel gear 1 306 is fixedly mounted on the outside of the external threaded cylinder 304, and the bevel gear 1 306 is meshed with a bevel gear 2 307, and an assembly shaft frame 1 308 is rotatably mounted on the side of the bevel gear 2 307, and a linear cylinder 1 309 is mounted on the outside of the assembly shaft frame 1 308; the linear cylinder 1 309 is used to adjust the bevel gear 2 307 on the assembly shaft frame 1 308 to be engaged or disengaged with the bevel gear 1 306; the bevel gear 2 307 and the bevel gear 4 311 are concentrically positioned and slidably provided with a transmission square rod 313, and one end of the transmission square rod 313 is connected to a servo motor 2 314; the servo motor 2 314 is used to actively drive the transmission square rod 313 to rotate.

[0020] According to the above embodiment, the working principle of the present invention is: When welding large marine valves, the valve workpiece must be positioned first; After starting the linear cylinder 1 309, the assembly shaft frame 1 308 is pushed, so that the bevel gear 2 307 and the bevel gear 1 306 are in a meshing state, and the servo motor 2 314 is turned on, which drives the transmission square rod 313 to rotate, driving the bevel gear 2 307 and the bevel gear 1 306 to rotate (the bevel gear 1 306 and the bevel gear 3 310 are in a separated state), and the external threaded barrel 304 rotates accordingly. The external threaded barrel 304 is spirally driven along the welding fixture 1, so that the distance between the two workpiece positioning structures 3 can be adjusted according to the valve workpiece, thereby realizing the position and distance adjustment of the valve workpiece; The valve workpiece is clamped by actively rotating the screw rack clamping rod 302, so that it is spirally driven along the extended arc rack, and the three screw rack clamping rods 302 are relatively rotated to clamp the valve workpiece; Next, the second linear cylinder 315 is actuated to push the second assembly shaft frame 312, causing the fourth bevel gear 311 to mesh with the third bevel gear 310 (in this step, the second bevel gear 307 and the first bevel gear 306 are separated). The second servo motor 314 continues to work, driving the fourth bevel gear 311 to rotate via the transmission square rod 313. The fourth bevel gear 311 meshes with the third bevel gear 310. The internal threaded barrel 305 rotates synchronously with the third bevel gear 310 and is spirally driven by the push screw 216. The push screw 216 passes through the limit of the limit arc plate 217, and the weld bottom sealing structure 2 can be extended into the inner side of the valve workpiece to accurately locate the weld position of the valve workpiece. The four arc plates 215 that make the weld axially aligned correspond to the weld axis. During the bottom welding process, the brushless motor 208 is turned on to drive the reciprocating screw 207 to rotate. The reciprocating push plate 209, which is screw-driven with the reciprocating screw 207, moves in the adjustment slot 203 outside the limit rod 202. The reset slot 210 inside the reciprocating push plate 209 is elastically connected to the assembly frame plate 212 via the tension spring 211. As the reciprocating push plate 209 moves, the assembly frame plate 212 slides in the bevel slot plate 1 204 and the bevel slot plate 2 205. The assembly frame plate 212, which is arranged vertically, first contacts the bevel slot plate 1 204, passes through the inclined surface of the bevel slot plate 1 204, and gradually moves to the same horizontal position, causing the driving assembly rod 213 on the reset inner block 218 to move simultaneously upward and downward through the arc-shaped plate 215 clamped by the clamping slot plate 214. The assembly frame plate 212, which continues to move, moves outward along the extension groove 206 of the bevel slot plate 1 204. The reset inner block 218 is clamped by the bevel slot plate 1 204 and stays inside it, compressing the reset spring 219. The angled groove plate 1 204 of the two groups of arc plates 215 is first moved close to the weld position of the valve workpiece. Then, the assembly rod 213 of the angled groove plate 205 is moved back to the weld position of the valve component. Finally, the two groups of four arc plates 215 form a ring shape to seal the inner weld of the valve component, forming a weld pool in the weld. The reset spring 219 and the reset inner block 218 ensure that the position of the arc plates 215 is stable and reset during operation. Welding operation: Start the electric telescopic cylinder, adjust the height of the welding top frame 4 to the appropriate position, turn on the servo motor 9, drive the spur gear 8 to rotate, and the outer gear ring 7 engaged with the spur gear 8 drives the welding ring 6 to rotate. The linear electric cylinder 10 controls the extension and retraction of the welding gun head 11 to weld the valve workpiece weld. The gas supply pipe 12 is connected to the external oxygen supply bottle and gas welding bottle through the gas supply shaft ring 13 to provide gas for welding. The entire process is uniformly controlled by the controller 15 to achieve automated welding; The welding gun head 11 is equipped with an electronic igniter, which can realize automatic ignition of the combustible gas. During the welding process, the welding gun head 11 first seals the four arc-shaped plates 215 that are close to the inner weld of the valve workpiece, and then welds and seals the separation gaps between the four arc-shaped plates 215; After the four arc-shaped plates 215 are welded and sealed to the weld seam of the valve workpiece, during the welding process of the thick wall gap of the valve workpiece, firstly, the arc-shaped plates 215 seal the weld seam to form a weld pool, which is conducive to the effective welding of the thick wall valve workpiece. Secondly, the arc-shaped plates 215 seal the weld seam and the internal space of the valve workpiece to prevent welding slag from falling into the interior of the valve workpiece. After the welding of the valve workpiece is completed, the arc-shaped plate 215 welded inside the valve workpiece can be separated by soaking in a chemical solution or polished with a polishing device to keep it flat with the valve workpiece.

[0021] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making creative work should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention are implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. A welding tool for manufacturing large marine valves, characterized in that: include: Welding fixture (1); The upper end of the welding fixture (1) is symmetrically equipped with a workpiece positioning structure (3) for clamping and positioning the valve workpiece along the middle portion; A weld bottom sealing structure (2) for sealing the internal weld position of the valve workpiece is detachably mounted on the inner side of the single workpiece positioning structure (3); The weld bottom sealing structure (2) comprises a positioning plate (201) and a concentrically fixed limiting rod (202), and two sets of beveled groove plates (1) (204) and (205) are fixed to one end of the limiting rod (202) away from the positioning plate (201); An assembly frame plate (212) is slidably provided in the first bevel groove plate (204) and the second bevel groove plate (205) in correspondence therewith.

2. A welding tool for manufacturing large marine valves according to claim 1, characterized in that: An extension slot (206) is provided through one end of the bevel slot plate (204) for extending and moving corresponding to the assembly frame plate (212), and a reset inner block (218) is slidably provided inside the assembly frame plate (212), and a reset spring (219) is elastically sleeved between the reset inner block (218) and the assembly frame plate (212); An assembly rod (213) is fixed to the upper end of the reset inner block (218), and a slot plate (214) in a closed state along one direction is fixed to the upper end of the assembly rod (213). An arc plate (215) is provided on the slot plate (214) in a transversely sliding manner for sealing the weld seam. There are four arc-shaped plates (215) in total, which are tightly attached to each other to form a metal ring that seals the inner weld of the valve member.

3. A welding tool for manufacturing large marine valves according to claim 1, characterized in that: An adjusting groove (203) is provided inside the limiting rod (202), and a reciprocating push plate (209) sleeved on the outside of the limiting rod (202) is slidably provided inside the adjusting groove (203), and the reciprocating push plate (209) and the limiting rod (202) are coaxially connected and spirally driven to provide a reciprocating screw rod (207) rotating inside the adjusting groove (203); One end of the reciprocating screw rod (207) is connected to a brushless motor (208) fixedly located inside the positioning plate (201).

4. A welding tool for manufacturing large marine valves according to claim 3, characterized in that: A reset groove (210) is provided in a cross shape at positions corresponding to the four assembly rack plates (212) on the inner side of the reciprocating push plate (209), and one end of the assembly rack plate (212) is vertically slidably located inside the reset groove (210), and a tension spring (211) is elastically installed between the assembly rack plate (212) and the reset groove (210).

5. A welding tool for manufacturing large marine valves according to claim 4, characterized in that: A push screw (216) is integrally fixed to one end of the positioning disc (201) away from the limiting rod (202), and a limiting arc plate (217) integrally fixed to the positioning disc (201) is provided on the outside of the pushing screw (216).

6. A welding tool for manufacturing large marine valves according to claim 1, characterized in that: The workpiece positioning structure (3) includes a clamping frame (301), and the clamping frame (301) is integrally fixed with a limiting arc frame (303) that is movable and limited inside the welding fixture frame (1); An external threaded barrel (304) and an internal threaded barrel (305) are rotatably mounted on the side wall of the clamping frame (301).

7. A welding tool for manufacturing large marine valves according to claim 6, characterized in that: The inner side of the internal threaded barrel (305) is spirally driven with the push screw (216), and a helical gear three (310) is fixedly mounted on the outer side of one end of the internal threaded barrel (305), and the helical gear three (310) is meshed with a helical gear four (311).

8. A welding tool for manufacturing large marine valves according to claim 7, characterized in that: The outer side of the bevel gear 4 (311) is rotatably mounted with an assembly shaft frame 2 (312), and the outer side of the assembly shaft frame 2 (312) is mounted with a linear cylinder 2 (315).

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