A welding tool for manufacturing a large marine valve

Abstract

The present application relates to valve welding technical field, specifically to a kind of welding tool for large marine valve manufacturing, comprising: welding tool frame;The welding tool frame upper end along middle part is symmetrically equipped with the workpiece positioning structure for clamping and positioning valve workpiece;Single workpiece positioning structure inner side is detachably equipped with the weld seal bottom structure for the closed arrangement to the internal weld position of valve workpiece;The present application, the design of weld seal bottom structure, utilizes the synergistic effect of multiple components such as bevel groove plate, assembly frame plate and arc plate, can automatically close the internal space of weld inner side, in this process, assembly frame plate moves on bevel groove plate, and then forms a sealed metal ring, and the formed metal ring and the weld of valve workpiece form a welding pool, this design effectively prevents the leakage of welding liquid to the interior of valve workpiece during welding process, ensures the quality of large marine valve wall thickness welding, thereby avoiding the generation of welding defects.

Description

Technical Field

[0001] This invention relates to the field of valve welding technology, and more specifically to a welding fixture for manufacturing large marine valves. Background Technology

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

[0003] For the internal welds of large marine valves, especially large marine valves, due to the wall thickness, a large weld seam needs to be left during welding to accommodate the welding torch extending into the weld seam to weld the inner walls of both. During the welding process, it is impossible to form a stable weld pool inside the weld seam, resulting in weak welds and easy porosity. At the same time, without reliable bottom sealing measures, welding slag can easily fall into the valve's interior, contaminating the valve's internal structure, affecting the valve's normal opening and closing and media flow, and increasing maintenance costs.

[0004] Therefore, those skilled in the art have provided a welding fixture for manufacturing large marine valves to solve the problems mentioned in the background art. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides: A welding fixture for manufacturing large marine valves includes: a welding fixture frame; The upper end of the welding fixture is symmetrically equipped with a workpiece positioning structure for clamping and positioning the valve workpiece along the middle section; The inner side of each workpiece positioning structure is detachably fitted with a weld sealing structure that seals the weld position inside the valve workpiece. The weld sealing structure includes a positioning plate and a limiting rod that is concentrically fixed thereto. Two sets of angled groove plates one and two angled groove plates are fixed at the end of the limiting rod away from the positioning plate. Both the first and second angled groove plates have corresponding slidable assembly rack plates.

[0006] Preferably, the oblique groove plate has an extension groove through one end for the corresponding assembly frame plate to extend and move, and a reset inner block is slidably arranged 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 that is closed in one direction is fixed to the upper end of the assembly rod. An arc-shaped plate that is slidably engaged with the slot plate to close the weld seam is provided. There are four arc-shaped plates in total, which are pressed together to form a metal ring that seals the weld seam inside the valve component.

[0007] Preferably, the limiting rod has an adjustment groove inside, and a reciprocating push plate sleeved on the outside of the limiting rod is slidably arranged inside the adjustment groove. The reciprocating push plate is helically driven with the limiting rod at the same position as the limiting rod and is rotated on the inside of the adjustment groove. One end of the reciprocating lead screw is connected to a brushless motor fixed inside the positioning plate.

[0008] Preferably, the reciprocating push plate has a reset groove in a cross shape on the inner side corresponding to the four assembly racks, and one end of the assembly rack is vertically slidable inside the reset groove. A tension spring is elastically assembled between the assembly rack and the reset groove.

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

[0010] Preferably, the workpiece positioning structure includes a clamping frame, and the clamping frame is fixedly equipped with a limiting arc frame that restricts movement within the welding fixture frame. The clamping frame has an external threaded cylinder and an internal threaded cylinder rotatably mounted on its side wall.

[0011] Preferably, the inner side of the internal threaded cylinder is connected to the push screw for helical transmission, and a helical gear three is fixedly assembled on the outer side of one end of the internal threaded cylinder, and the helical gear three meshes with a helical gear four.

[0012] Preferably, an assembly shaft bracket two is rotatably mounted on the outer side of the helical gear four, and a linear cylinder two is mounted on the outer side of the assembly shaft bracket two.

[0013] The technical effects and advantages of this invention are as follows: This invention features a weld seam sealing structure that utilizes the synergistic effect of multiple components, including an angled groove plate, an assembly frame plate, and an arc-shaped plate, to automatically seal the internal space along the inner edge of the weld seam. During this process, the assembly frame plate moves on the angled groove plate, allowing the arc-shaped plate to precisely fit onto the inner edge of the valve component's weld seam, thus forming a sealed metal ring. This metal ring and the weld seam of the valve component form a weld pool. This design effectively prevents the welding liquid from leaking into the valve component during the welding process, ensuring the quality of the welded wall thickness of large marine valves and thus avoiding welding defects. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a welding fixture for manufacturing large marine valves provided in this application; Figure 2 This is a frontal structural diagram of a welding fixture for manufacturing large marine valves provided in this application; Figure 3This is a three-dimensional structural diagram of the weld seam sealing structure in a welding fixture for manufacturing large marine valves provided in this application; Figure 4 This is a schematic diagram of the side of the weld seam sealing structure in a welding fixture for manufacturing large marine valves provided in this application; Figure 5 This is a cross-sectional schematic diagram of the weld seam sealing structure in a welding fixture for manufacturing large marine valves provided in this application; Figure 6 This is a schematic diagram of the arc-shaped plate assembly structure of the weld seam sealing structure in a welding fixture for manufacturing large marine valves provided in this application; Figure 7 This is a schematic diagram of the weld pool structure formed in a welding fixture for manufacturing large marine valves provided in this application; Figure 8 This is a schematic diagram of the workpiece positioning structure in a welding fixture for manufacturing large marine valves provided in this application; Figure 9 This application provides a welding fixture for manufacturing large marine valves. Figure 8 A structural diagram of the source A in the middle.

[0015] In the picture: 1. Welding fixtures; 2. Weld seam sealing structure; 201. Positioning plate; 202. Limiting rod; 203. Adjustment groove; 204. Angled groove plate one; 205. Angled groove plate two; 206. Extension groove; 207. Reciprocating screw; 208. Brushless motor; 209. Reciprocating push plate; 210. Reset groove; 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. External threaded cylinder; 305. Internal threaded cylinder; 306. Helical gear one; 307. Helical gear two; 308. Assembly shaft frame one; 309. Linear cylinder one; 310. Helical gear three; 311. Helical gear four; 312. Assembly shaft frame two; 313. Transmission square rod; 314. Servo motor two; 315. Linear cylinder two; 4. Welding top frame; 5. Side shaft ring; 6. Welding ring; 7. External gear ring; 8. Spur gear; 9. Servo motor 1; 10. Linear electric cylinder; 11. Welding torch head; 12. Air supply pipe; 13. Air supply shaft ring; 14. Connecting pipe; 15. Controller. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Examples of the invention are given for illustrative and descriptive purposes only and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0017] Example 1, please refer to Figures 1-2 This embodiment provides a welding fixture for manufacturing large marine valves, including: a welding fixture frame 1; the upper end of the welding fixture frame 1 is symmetrically equipped with a workpiece positioning structure 3 for clamping and positioning the valve workpiece along the middle; the workpiece positioning structure 3 is used to clamp the large marine valve workpiece to be welded and axially connect the weld seam to form a weldable weld seam; a weld seam sealing structure 2 is detachably assembled inside each workpiece positioning structure 3 to seal the weld seam position inside the valve workpiece. The weld seam sealing structure 2 can seal the weld seam formed by clamping the large marine valve workpiece to be welded by the workpiece positioning structure 3 from the inside; the welding fixture 1 has a welding top frame 4 movably installed on the top, and an electric telescopic cylinder is installed between one end of the welding top frame 4 and the welding fixture 1; a side shaft ring 5 is installed by drilling a hole on the inner side of the middle of the welding top frame 4, and a welding ring 6 is rotatably installed on the inner side of the side shaft ring 5. Several installation positions are fixed in a ring at equal intervals along the inner edge of the welding ring 6, and a linear electric cylinder 10 is detachably installed on each installation position. A welding gun head 11 for welding valve workpieces is installed at the output end of the linear electric cylinder 10. An external toothed ring 7 is fixed to the outer edge of the welding ring 6, and the external toothed ring 7 meshes with a spur gear 8. The spur gear 8 is connected to a servo motor 9. The servo motor 9 is fixedly mounted 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 external toothed ring 7 and rotates the welding ring 6, which is beneficial for the annular welding of the valve component. The welding torch head 11 is connected to a gas supply pipe 12 for supplying gas and oxygen. The end of the gas supply pipe 12 away from the welding torch head 11 is connected to a gas supply collar 13. The middle part of the gas supply collar 13 is a collar with a sealed rotational setting. The collar is connected to a connecting pipe 14 that connects to an external oxygen supply cylinder and an external gas welding cylinder. A controller 15 is installed on the side of the welding fixture 1.

[0018] Example 2, please refer to Figures 3-7 In this embodiment, a weld seam sealing structure 2 is provided in the welding fixture for manufacturing large marine valves; The weld sealing structure 2 includes a positioning plate 201 and a concentrically fixed limiting rod 202. Two sets of angled groove plates 1 204 and angled groove plates 205 are fixed at the end of the limiting rod 202 away from the positioning plate 201. The angled groove plates 1 204 and angled groove plates 205 are fixedly assembled in a cross shape on the outer wall of the limiting rod 202. An assembly frame plate 212 is slidably provided in both the angled groove plates 1 204 and angled groove plates 205. When the assembly rack 212 moves along the first angled slot plate 204, it first passes through the inclined surfaces of the first angled slot plate 204 and the second angled slot plate 205, so that the assembly rack 212 gradually moves to the same horizontal position as the first angled slot plate 204 and the second angled slot plate 205; one end of the first angled slot plate 204 is provided with an extension slot 206 for corresponding extension movement of the assembly rack 212, and a reset inner block 218 is slidably arranged inside the assembly rack 212. A reset spring 219 is elastically sleeved between the reset inner block 218 and the assembly rack 212; the reset spring 219 is used to elastically reset the position of the reset inner block 218 inside the assembly rack 212. The upper end of the reset inner block 218 is fixed with an assembly rod 213, and the upper end of the assembly rod 213 is fixed with a slot plate 214 that is closed in one direction. The slot plate 214 is laterally slidably fitted with an arc-shaped plate 215 that is designed to close the weld. The arc-shaped plates 215 are in groups of two, and there are two groups. The two groups of arc-shaped plates 215 are pushed toward the weld position of the valve component in sequence, so that the four arc-shaped plates 215 in the two groups are arranged in a ring shape on the weld of the inner edge of the valve component. There are four arc-shaped plates 215 in total, which are closely fitted to form a metal ring that seals the inner weld seam of the valve component; the limiting rod 202 has an adjustment groove 203 inside, and a reciprocating push plate 209 is slidably disposed on the inner side of the adjustment groove 203 and sleeved on the outer side of the limiting rod 202. The reciprocating push plate 209 and the limiting rod 202 are helically driven by a reciprocating screw 207 located on the inner side of the adjustment groove 203; the reciprocating screw 207 and the reciprocating push plate 209 are helically driven. When the reciprocating screw 207 rotates actively, it helically drives the reciprocating push plate 209, causing it to move and adjust its pushing position on the outer side of the limiting rod 202 along the inner side of the adjustment groove 203. One end of the reciprocating lead screw 207 is connected to a brushless motor 208 fixed inside the positioning plate 201; the brushless motor 208 is used to actively drive the reciprocating lead screw 207 to rotate; the reciprocating push plate 209 has a reset groove 210 in a cross shape corresponding to the positions of the four assembly rack plates 212 on its inner side, and one end of the assembly rack plate 212 is vertically slidably located inside the reset groove 210; a tension spring 211 is elastically assembled between the assembly rack plate 212 and the reset groove 210. A limiting slide rod is fixed inside the reset groove 210, and a vertical bushing is fitted on the assembly frame plate 212 at the position corresponding to the limiting slide rod. The assembly frame plate 212 is slidably sleeved on the limiting slide rod through the vertical bushing and is elastically reset by the tension spring 211. A push screw 216 is integrally fixed at one end of the positioning disk 201 away from the limiting rod 202, and a limiting arc plate 217 integrally fixed to the positioning disk 201 is provided on the outside of the push screw 216.

[0019] Example 3, please refer to Figures 8-9 In this embodiment, a workpiece positioning structure 3 is provided in the welding fixture for manufacturing large marine valves; The workpiece positioning structure 3 includes a clamping frame 301, and the clamping frame 301 is fixedly equipped with a limiting arc frame 303 that is movable and restricted inside the welding fixture frame 1; the limiting arc frame 303 is laterally movable inside the welding fixture frame 1; an external threaded cylinder 304 and an internal threaded cylinder 305 are rotatably mounted on the side wall of the clamping frame 301. The inner threaded cylinder 305 is helically driven by the push screw 216, and a helical gear 310 is fixedly mounted on the outer side of one end of the inner threaded cylinder 305, and the helical gear 310 meshes with a helical gear 411; the inner threaded cylinder 305 and the outer threaded cylinder 304 are rotatably connected; an assembly shaft bracket 2 312 is rotatably mounted on the outer side of the helical gear 411, and a linear cylinder 2 315 is mounted on the outer side of the assembly shaft bracket 2 312; the linear cylinder 2 315 is used to push the position of the helical gear 411 mounted on the assembly shaft bracket 2 312, so that the helical gear 411 can be in a disengaged or engaged state with the helical gear 310; The clamping frame 301 has three extended arc frames arranged in a ring at equal intervals, and each of the extended arc frames has an adjustable screw clamping rod 302 on its inner side. The screw clamping rod 302 and the extended arc frame are locked and positioned by a screw. The screw clamping rod 302 and the extended arc frame are in a vertical helical transmission state. The screw clamping rod 302 can move along the extended arc frame by rotation to clamp and position the valve workpiece, which is beneficial for welding setup. A helical gear 306 is fixedly mounted on the outer side of the external threaded cylinder 304, and the helical gear 306 meshes with a helical gear 307. An assembly shaft bracket 308 is rotatably mounted on the side of the helical gear 307, and a linear cylinder 309 is mounted on the outer side of the assembly shaft bracket 308. The linear cylinder 309 is used to adjust the helical gear 307 on the assembly shaft bracket 308 to be engaged or disengaged from the helical gear 306. The helical gear 307 and the helical gear 311 are concentrically mounted with a transmission rod 313, and one end of the transmission rod 313 is connected to a servo motor 314. The servo motor 314 is used to actively drive the transmission rod 313 to rotate.

[0020] According to the above embodiments, the working principle of this invention is as follows: When welding large marine valves, the valve workpiece must first be positioned. After starting the linear cylinder 309, the assembly shaft 308 is pushed, causing the helical gear 307 to mesh with the helical gear 306. The servo motor 314 is then turned on, which drives the transmission rod 313 to rotate, causing the helical gears 307 and 306 to rotate (the helical gear 306 and the helical gear 310 are in a separated state). The external threaded cylinder 304 rotates accordingly and moves along the welding fixture 1 in a spiral drive, so that the distance between the two workpiece positioning structures 3 can be adjusted according to the valve workpiece, thereby realizing the adjustment of the valve workpiece position distance. The valve workpiece is clamped by actively rotating the screw clamping rod 302, causing it to move along the extended arc frame in a spiral motion, and rotating the three screw clamping rods 302 relative to each other to clamp the valve workpiece. Next, the linear cylinder 2 315 actuates, pushing the assembly shaft 2 312, so that the helical gear 4 311 meshes with the helical gear 310 (in this step, the helical gear 2 307 and the helical gear 1 306 are in a separated state). The servo motor 2 314 continues to work, driving the helical gear 4 311 to rotate through the transmission square rod 313. The helical gear 4 311 meshes with the helical gear 310. The internal threaded cylinder 305 rotates synchronously with the helical gear 310 and is driven by the push screw 216. The push screw 216 is limited by the limiting arc plate 217, so that the weld sealing structure 2 can be inserted into the inside of the valve workpiece to accurately position 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 sealing 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 groove 203 outside the limit rod 202. The reset groove 210 inside the reciprocating push plate 209 is elastically connected to the assembly frame plate 212 through the tension spring 211. As the reciprocating push plate 209 moves, the assembly frame plate 212 slides in the first angled groove plate 204 and the second angled groove plate 205. The assembly rack 212, which is arranged vertically, first contacts the angled slot plate 204. After passing through the inclined surface of the angled slot plate 204, it gradually moves to the same horizontal position, causing the driving assembly rod 213 on the reset inner block 218 to move simultaneously to the upper and lower sides through the arc plate 215 clamped by the slot plate 214. Meanwhile, the continuously moving assembly rack 212 moves outward along the extension groove 206 of the angled slot plate 204. The reset inner block 218 stops inside the angled slot plate 204 and compresses the reset spring 219. In the two sets of arc plates 215, the first angled groove plate 204 moves closer to the weld of the valve workpiece, and then the assembly rod 213 of the second angled groove plate 205 moves closer to the weld of the valve workpiece. Finally, the two sets of four arc plates 215 form a ring shape to seal the weld along the inner edge of the valve workpiece, forming a weld pool inside the weld. The return spring 219 and the return inner block 218 ensure the stability and reset of the position of the arc plate 215 during the working process. 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, the external gear ring 7 meshing 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 torch head 11 to weld the valve workpiece weld. The gas supply pipe 12 is connected to the external oxygen supply cylinder and gas welding cylinder through the gas supply shaft ring 13 to provide gas for welding. The whole process is controlled by the controller 15 to realize automated welding. The welding torch head 11 is equipped with an electronic igniter, which can realize the automatic ignition of combustible gas. During the welding process, the welding torch head 11 first seals the four arc plates 215 that are close to the inner side of the valve workpiece weld, and then seals the separation gap between the four arc plates 215. After the four arc plates 215 are welded and sealed with the weld seam of the valve workpiece, during the welding process of the thick-walled gap of the valve workpiece, the weld seam is sealed with arc plates 215 to form a weld pool, which is conducive to the effective welding of the thick-walled valve workpiece. Secondly, the arc plates 215 form a closed space between the weld seam and the internal space of the valve workpiece, which can prevent welding slag from falling into the interior of the valve workpiece. The arc-shaped plate 215 welded inside the valve workpiece can be removed by soaking in a chemical solution or by grinding with a grinding device to keep it flat with the valve workpiece after the valve workpiece is welded.

[0021] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort 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, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A welding fixture 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. The inner side of the single workpiece positioning structure (3) is detachably equipped with a weld sealing structure (2) that seals the weld position inside the valve workpiece. The weld sealing structure (2) includes a positioning plate (201) and a concentrically fixed limiting rod (202). Two sets of angled groove plates (204) and angled groove plates (205) are fixed at the end of the limiting rod (202) away from the positioning plate (201). Both the first oblique groove plate (204) and the second oblique groove plate (205) are equipped with corresponding sliding assembly rack plates (212); One end of the angled groove plate (204) is provided with an extension groove (206) for the corresponding assembly frame plate (212) to extend and move. The assembly frame plate (212) is provided with a sliding reset inner block (218). A reset spring (219) is elastically sleeved between the reset inner block (218) and the assembly frame plate (212). The upper end of the reset inner block (218) is fixed with an assembly rod (213), and the upper end of the assembly rod (213) is fixed with a slot plate (214) that is closed in one direction. The slot plate (214) is laterally slidably fitted with an arc plate (215) that is closed for the weld. There are four arc-shaped plates (215) in total, which are closely fitted together to form a metal ring that seals the weld seam inside the valve component; The limiting rod (202) has an adjustment groove (203) inside, and a reciprocating push plate (209) sleeved on the outside of the limiting rod (202) is slidably arranged inside the adjustment groove (203). The reciprocating push plate (209) and the limiting rod (202) are concentrically connected by a reciprocating screw (207) that rotates inside the adjustment groove (203). One end of the reciprocating lead screw (207) is connected to a brushless motor (208) fixed inside the positioning disk (201). The reciprocating push plate (209) has a reset groove (210) in a cross shape on the inner side corresponding to the four assembly racks (212). One end of the assembly rack (212) is vertically slidable inside the reset groove (210). A tension spring (211) is elastically assembled between the assembly rack (212) and the reset groove (210). The end of the positioning disk (201) away from the limiting rod (202) is fixed with a push screw (216), and a limiting arc plate (217) is provided on the outside of the push screw (216) and is fixed to the positioning disk (201).

2. The welding fixture 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 fixed with a limiting arc frame (303) that is movable and restricted inside the welding fixture frame (1); an external threaded cylinder (304) and an internal threaded cylinder (305) are rotatably installed on the side wall of the clamping frame (301).

3. The welding fixture for manufacturing large marine valves according to claim 2, characterized in that, The inner side of the internal threaded cylinder (305) is connected to the push screw (216) for helical transmission, and a helical gear three (310) is fixedly assembled on the outer side of one end of the internal threaded cylinder (305), and the helical gear three (310) meshes with a helical gear four (311).

4. The welding fixture for manufacturing large marine valves according to claim 3, characterized in that, The helical gear four (311) is rotatably mounted on the outer side of the assembly shaft bracket two (312), and the assembly shaft bracket two (312) is mounted on the outer side of the linear cylinder two (315).

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