Tool for welding valve

Abstract

The application relates to the technical field of valve welding, and discloses a tool for valve welding, which comprises a valve shell and a flange ring, the flange ring is arranged on the surface of the two ends of the valve shell, can realize butt joint of the valve body after welding by cooperating with bolts, an elastic sealing edge mechanism is arranged on the welding end of the valve shell close to the flange ring, a folding and unfolding type isolation mechanism is installed in the elastic sealing edge mechanism, a flow guide mechanism is arranged in the middle of the folding and unfolding type isolation mechanism, and a pneumatic positioning mechanism is installed in the middle of the flow guide mechanism, so that the elastic sealing edge mechanism, the folding and unfolding type isolation mechanism and the flow guide mechanism can be stably installed in the valve shell during welding. The tool for valve welding is provided with the elastic sealing edge mechanism, the folding and unfolding type isolation mechanism, the flow guide mechanism and the pneumatic positioning mechanism, the positions of the elastic sealing edge mechanism and the folding and unfolding type isolation mechanism can be adjusted in real time during use, the adjacent area of the welding spot can be continuously and effectively covered, and the welding slag can be prevented from splashing into the valve shell.

Description

Technical Field

[0001] This invention relates to the field of valve welding technology, specifically to tooling for valve welding. Background Technology

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and regulate and control the parameters of the transported medium. According to their functions, they can be divided into shut-off valves, check valves, regulating valves, etc. Valves are control components in fluid transport systems, and have functions such as shut-off, regulation, flow guidance, backflow prevention, pressure stabilization, flow diversion, or overflow pressure relief. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media.

[0003] When welding flange rings and valve bodies of medium and large valves, the high-temperature molten metal and spatter generated during the welding process using a welding torch are very likely to fall into and adhere to the inner surface of the valve body. This may not only obstruct the flow path, but also significantly affect the valve's sealing performance and operational reliability, posing a potential risk to the long-term stable operation of the equipment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a tooling for valve welding, which solves the problems mentioned in the background.

[0005] The present invention provides the following technical solution: a tooling for valve welding, including a valve body and flange rings, wherein the flange rings are respectively disposed on the surfaces of both ends of the valve body so as to achieve valve body docking with bolts after welding;

[0006] An elastic sealing mechanism is provided on the valve body near the flange ring welding end. During welding, the elastic sealing mechanism forms a barrier on the inner cavity edge near the valve body weld point.

[0007] A folding isolation mechanism installed inside the elastic sealing mechanism is used to isolate welding slag that falls into the valve body near the weld point.

[0008] A flow guiding mechanism positioned in the middle of the folding isolation mechanism directs the airflow to clear weld slag and move it towards the periphery of the valve body during welding; and,

[0009] A pneumatic positioning mechanism installed in the middle of the flow guiding mechanism is used to stably install the elastic sealing mechanism, the folding isolation mechanism and the flow guiding mechanism inside the valve body during welding.

[0010] Preferably, the flexible edge sealing mechanism includes:

[0011] An elastic sealing element is snapped onto the valve body near the flange ring welding end, so that it can cover the valve body end by its own elastic self-adaptive compression during welding;

[0012] The deployable isolation mechanism includes:

[0013] The flame-retardant cloth set inside the elastic edge seal unfolds during welding to block welding slag from falling into the valve body, and folds along with the elastic edge seal when the elastic edge seal contracts.

[0014] The flow guiding mechanism includes:

[0015] An elastic air guide tube is installed on the top of the elastic sealing element and an electromagnetic distribution valve is located above the elastic sealing element so that an external air source can be introduced into the elastic air guide tube through the electromagnetic distribution valve during welding.

[0016] The pneumatic positioning mechanism includes:

[0017] The air guide seat is located in the middle of the flame-retardant fabric to support the rubber airbag and support feet;

[0018] A rubber air bladder, fixedly mounted on the surface of the air guide seat, converts the inflation / deflation state of the gas into the extension / contraction state of the support legs; and,

[0019] Three support feet located around the rubber airbag are used to secure the pneumatic positioning mechanism inside the valve housing by unfolding the support feet.

[0020] Preferably, the elastic edge banding includes:

[0021] The elastic longitudinal sealing strip is snapped onto the inner wall of the valve body to cover the inner wall of the valve body near the flange ring welding end;

[0022] An integrally installed elastic transverse sealing strip on one side of the elastic longitudinal sealing strip to cover the end face of the valve body near the flange ring welding end; and,

[0023] An integral connecting block is installed on the side of the elastic longitudinal sealing strip away from the elastic transverse sealing strip to cooperate with the elastic transverse sealing strip support shaft.

[0024] Preferably, the flexible edge sealing mechanism further includes:

[0025] The handles are fixedly connected to both ends of the elastic horizontal sealing strip and the elastic bottom sealing strip is fixedly connected to one end of the handle, so as to provide auxiliary force points when the elastic sealing strip is compressed and shrinks.

[0026] Multiple support shafts are fixedly inserted between the elastic transverse sealing strip and the connecting block, and a rolling roller is movably sleeved on the surface of the multiple support shafts to reduce the resistance between the elastic sealing element and the valve body when the elastic sealing element rotates; and,

[0027] An isolation flame-retardant ring is set between the elastic horizontal sealing strip and the valve body to isolate the elastic horizontal sealing strip and the valve body during welding, preventing the high temperature of the welding torch from welding the two together.

[0028] Preferably, the foldable isolation mechanism further includes:

[0029] An elastic frame is fixedly fitted onto the edge of the flame-retardant fabric, and the surface of the elastic frame is fixedly connected to the surface of the elastic longitudinal sealing strip to provide support for the flame-retardant fabric; and,

[0030] A rotating cylinder is fixedly connected to the surface of an elastic frame, and the interior of the rotating cylinder is rotatably connected to the surface of the air guide seat, so as to support the rotating shaft, the first connecting frame and the second connecting frame through the rotating cylinder.

[0031] Preferably, the foldable isolation mechanism further includes:

[0032] A rotating shaft is fixedly inserted inside the rotating cylinder to support the first connecting frame and the second connecting frame;

[0033] A first connecting frame and a second connecting frame are rotatably connected to the surface of the rotating shaft, and the surfaces of the first connecting frame and the second connecting frame are respectively fixedly connected to the surfaces at both ends of the elastic longitudinal sealing strip, so as to connect the elastic longitudinal sealing strip to the rotating cylinder through the rotating shaft and the second connecting frame.

[0034] Preferably, the flow guiding mechanism further includes:

[0035] The top cylinder located inside the rotating cylinder and the air inlet channel that runs through both ends of the top cylinder are used to connect the air inlet tube to the inside of the air guide seat.

[0036] Two flexible air guide hoses are located between the two ends of the flexible air guide tube and the solenoid distribution valve to connect the solenoid distribution valve and the flexible air guide tube; and,

[0037] An exhaust slit runs through the surface of the inflation duct.

[0038] Preferably, the flow guiding mechanism further includes:

[0039] An air inlet and an air jet inlet are provided on one side of the electromagnetic distribution valve, and the air guide hose is fixedly connected to the electromagnetic distribution valve through the air jet inlet.

[0040] The air intake and exhaust ports are located on the other side of the electromagnetic distribution valve.

[0041] An inflation conduit is fixedly installed at the inflation port to connect the electromagnetic distribution valve and the air intake channel;

[0042] An intake connector fixedly installed at the intake port to assist the solenoid distribution valve in connecting to an external air source; and,

[0043] An exhaust check valve is fixedly installed at the exhaust port to assist the rubber airbag in venting.

[0044] Preferably, the pneumatic positioning mechanism further includes:

[0045] Two limiting frames are fixedly sleeved on the surface of the air guide seat, the rubber airbag is located between the two limiting frames, and a connecting seat is fixedly installed on the surface of the rubber airbag;

[0046] Rotate the connecting rod between the connecting seat and the support leg to ensure the linkage between the rubber airbag and the support leg; and,

[0047] A fixing ring is fitted onto the inner wall of the rubber airbag to stabilize and fix the rubber airbag.

[0048] Preferably, the pneumatic positioning mechanism further includes:

[0049] A rubber block is fixedly connected to one end of the support leg to increase the frictional force between the support leg and the inner wall of the valve housing; and,

[0050] A vent hole is made through the surface of the air guide seat to connect the air guide seat with the interior of the rubber air bladder.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] 1. The welding fixture for this valve, through the setting of the elastic sealing mechanism, the folding isolation mechanism, the flow guiding mechanism and the pneumatic positioning mechanism, can ensure that the area near the weld point is continuously and effectively shielded and covered by the elastic sealing mechanism and the folding isolation mechanism in real time during use, thereby preventing weld slag from splashing into the valve body.

[0053] 2. The welding fixture for this valve, through the setting of elastic longitudinal sealing strip, elastic transverse sealing strip, connecting block, handle, elastic bottom sealing strip, support shaft, rolling roller and isolation flame retardant ring, can seal the end of the valve body through the elastic sealing element composed of elastic longitudinal sealing strip, elastic transverse sealing strip and connecting block, and adjust the position through the adjustability of the elastic sealing element.

[0054] 3. The welding fixture for this valve, through the setting of flame-retardant cloth, elastic frame, rotating cylinder, rotating shaft, first connecting frame and second connecting frame, can use the flame-retardant cloth and elastic sealing parts to cover the welding slag during use, so as to prevent the welding slag from easily falling into the valve body.

[0055] 4. The welding fixture for this valve, through the setting of an elastic air guide pipe, electromagnetic distribution valve, top cylinder, air inlet channel, air guide hose, exhaust slit, air filling interface, air jet interface, air inlet interface, exhaust interface, air filling conduit, air inlet connector and exhaust one-way valve, can guide the airflow of the air source into the elastic air guide pipe through the electromagnetic distribution valve during use, so that a gas barrier is formed on the outside of the elastic air guide pipe to clean and remove welding slag in real time.

[0056] 5. The welding fixture for this valve, through the setting of air guide seat, rubber air bag, support foot, limit bracket, connecting rod, fixing ring, rubber block and vent hole, can use the rubber air bag to push the support foot to unfold during use, so that the device is stably fixed to the inner wall of the valve body, ensuring that the elastic sealing part will not easily fall off when changing position. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of the structure of the present invention;

[0058] Figure 2 This is a bottom view of the present invention;

[0059] Figure 3 This is a schematic diagram of the structure of the present invention during operation;

[0060] Figure 4 This is a schematic diagram of the elastic edge sealing component structure of the present invention;

[0061] Figure 5 This is a schematic diagram of the folding isolation mechanism structure of the present invention;

[0062] Figure 6 This is a schematic diagram of the structure at the location of the pneumatic positioning mechanism of the present invention;

[0063] Figure 7 This is a cross-sectional view of the location of the pneumatic positioning mechanism of the present invention;

[0064] Figure 8 This is a schematic diagram of the electromagnetic distribution valve structure of the present invention;

[0065] Figure 9 This is a schematic diagram of the structure at the location of the rubber airbag in this invention;

[0066] Figure 10 This is a schematic diagram of the explosion structure at the location of the rubber airbag in this invention;

[0067] Figure 11 This is a cross-sectional view of the location of the elastic air guide tube of the present invention.

[0068] In the picture:

[0069] 101. Elastic longitudinal sealing strip; 102. Elastic transverse sealing strip; 103. Connecting block; 104. Handle; 105. Elastic bottom sealing strip; 106. Support shaft; 107. Rolling roller; 108. Flame-retardant isolation ring; 201. Flame-retardant cloth; 202. Elastic frame; 203. Rotating cylinder; 204. Rotating shaft; 205. First connecting frame; 206. Second connecting frame; 301. Elastic air guide pipe; 302. Electromagnetic distribution valve; 303. Top cap cylinder; 304. Air intake channel; 305. Air guide hose; 306. Exhaust slit; 307. Inflation port; 308. Jet port; 309. Air intake port; 310. Exhaust port; 311. Inflation duct; 312. Air intake connector; 313. Exhaust check valve; 401. Air guide seat; 402. Rubber airbag; 403. Support foot; 404. Limiting bracket; 405. Connecting rod; 406. Fixing ring; 407. Rubber block; 408. Vent hole. Detailed Implementation

[0070] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0071] Please see Figure 1-11 The valve welding fixture includes a valve body and flange rings. The flange rings are respectively set on the surfaces of both ends of the valve body so that the valve body can be connected with bolts after welding.

[0072] An elastic sealing mechanism is installed on the valve body near the flange ring welding end. During welding, the elastic sealing mechanism forms a barrier on the inner cavity edge near the valve body weld point.

[0073] A folding isolation mechanism installed inside the elastic sealing mechanism is used to isolate welding slag that falls into the valve body near the weld point.

[0074] A flow guiding mechanism positioned in the middle of the folding isolation mechanism directs the airflow to clear weld slag and move it towards the periphery of the valve body during welding; and,

[0075] A pneumatic positioning mechanism is installed in the middle of the flow guiding mechanism to stably install the elastic sealing mechanism, the folding isolation mechanism and the flow guiding mechanism inside the valve body during welding;

[0076] By incorporating a flexible sealing mechanism, a folding isolation mechanism, a flow guiding mechanism, and a pneumatic positioning mechanism, the positions of the flexible sealing mechanism and the folding isolation mechanism can be adjusted in real time during use to ensure continuous and effective shielding of the area near the weld point, thereby preventing weld slag from splashing into the valve body.

[0077] Among them, the flexible edge sealing mechanism includes:

[0078] An elastic sealing element is snapped onto the valve body near the flange ring welding end, so that it can cover the valve body end by its own elastic self-adaptive compression during welding;

[0079] Detachable isolation facilities include:

[0080] The flame-retardant cloth 201 set inside the elastic sealing element unfolds during welding to block welding slag from falling into the valve body. When the elastic sealing element contracts, the flame-retardant cloth 201 folds along with the elastic sealing element.

[0081] Traffic diversion mechanisms include:

[0082] An elastic air guide pipe 301 is provided on the top of the elastic sealing element and an electromagnetic distribution valve 302 is located above the elastic sealing element so that an external air source can be introduced into the elastic air guide pipe 301 through the electromagnetic distribution valve 302 during welding.

[0083] Pneumatic positioning mechanisms include:

[0084] The air guide seat 401 is located in the middle of the flame-retardant cloth 201 to support the rubber airbag 402 and the support foot 403.

[0085] A rubber airbag 402 is fixedly installed on the surface of the air guide seat 401 to convert the inflation / deflation state of the gas into the deployment / contraction state of the support foot 403; and,

[0086] Three support feet 403 located around the rubber airbag 402 are used to fix the pneumatic positioning mechanism inside the valve housing by unfolding the support feet 403.

[0087] Among them, the flexible edge banding includes:

[0088] The elastic longitudinal sealing strip 101 is snapped onto the inner wall of the valve body to cover the inner wall of the valve body near the flange ring welding end;

[0089] An integrally formed elastic transverse sealing strip 102 is installed on one side of the elastic longitudinal sealing strip 101 to cover the end face of the valve body near the flange ring welding end; and,

[0090] A connecting block 103 is integrally installed on the side of the elastic longitudinal sealing strip 101 away from the elastic transverse sealing strip 102, so as to cooperate with the elastic transverse sealing strip 102 to support the support shaft 106.

[0091] The flexible edge sealing mechanism also includes:

[0092] The handles 104 and the elastic bottom seal 105 are fixedly connected to the surfaces of both ends of the elastic horizontal sealing strip 102, respectively, to provide auxiliary force points when the elastic sealing part is compressed and shrinks.

[0093] Multiple support shafts 106 are fixedly inserted between the elastic horizontal sealing strip 102 and the connecting block 103, and a rolling roller 107 is movably sleeved on the surface of the multiple support shafts 106 to reduce the resistance between the elastic sealing element and the valve body when the elastic sealing element rotates; and,

[0094] An isolation flame-retardant ring 108 is set between the elastic horizontal sealing strip 102 and the valve body to isolate the elastic horizontal sealing strip 102 and the valve body during welding, so as to prevent the high temperature of the welding gun from welding the two together.

[0095] The valve body end can be sealed by the elastic sealing element composed of the elastic longitudinal sealing strip 101, elastic transverse sealing strip 102, connecting block 103, handle 104, elastic bottom sealing strip 105, support shaft 106, rolling roller 107 and isolation flame retardant ring 108, and the position can be adjusted by the adjustability of the elastic sealing element.

[0096] Among them, the foldable isolation facility also includes:

[0097] An elastic frame 202 is fixedly fitted onto the edge of the flame-retardant fabric 201, and the surface of the elastic frame 202 is fixedly connected to the surface of the elastic longitudinal sealing strip 101 to provide support for the flame-retardant fabric 201; and,

[0098] A rotating cylinder 203 is fixedly connected to the surface of the elastic frame 202, and the interior of the rotating cylinder 203 is rotatably connected to the surface of the air guide seat 401, so as to support the rotating shaft 204, the first connecting frame 205 and the second connecting frame 206 through the rotating cylinder 203.

[0099] Among them, the foldable isolation facility also includes:

[0100] A rotating shaft 204 is fixedly inserted inside the rotating cylinder 203 to support the first connecting frame 205 and the second connecting frame 206;

[0101] The first connecting frame 205 and the second connecting frame 206 are rotatably connected to the surface of the rotating shaft 204, and the surfaces of the first connecting frame 205 and the second connecting frame 206 are respectively fixedly connected to the surfaces at both ends of the elastic longitudinal sealing strip 101, so as to connect the elastic longitudinal sealing strip 101 to the rotating cylinder 203 through the rotating shaft 204 and the second connecting frame 206.

[0102] By using the flame-retardant cloth 201, elastic frame 202, rotating cylinder 203, rotating shaft 204, first connecting frame 205 and second connecting frame 206, the flame-retardant cloth 201, together with the elastic sealing piece, can block the welding slag during use, preventing the welding slag from easily falling into the valve body.

[0103] The flow guiding mechanism also includes:

[0104] The top cylinder 303 located inside the rotating cylinder 203 and the air inlet channel 304 extending through both ends of the top cylinder 303 are used to connect the air inlet duct 311 with the inside of the air guide seat 401.

[0105] Two flexible air guide hoses 305 are located between the two ends of the elastic air guide tube 301 and the electromagnetic distribution valve 302, respectively, to connect the electromagnetic distribution valve 302 and the flexible air guide tube 301; and,

[0106] An exhaust slit 306 is formed through the surface of the air inlet duct 311.

[0107] The flow guiding mechanism also includes:

[0108] An air inlet 307 and an air jet inlet 308 are provided on one side of the electromagnetic distribution valve 302, and the air guide hose 305 is fixedly connected to the electromagnetic distribution valve 302 through the air jet inlet 308.

[0109] An intake port 309 and an exhaust port 310 are located on the other side of the electromagnetic distribution valve 302;

[0110] An inflation conduit 311 is fixedly installed on the inflation port 307 to connect the electromagnetic distribution valve 302 and the air intake channel 304.

[0111] An intake connector 312 is fixedly installed on the intake port 309 to assist the solenoid distribution valve 302 in connecting to an external air source; and,

[0112] An exhaust check valve 313 is fixedly installed on the exhaust port 310 to assist the rubber airbag 402 in venting.

[0113] By incorporating the flexible air guide pipe 301, electromagnetic distribution valve 302, capping cylinder 303, air inlet channel 304, air guide hose 305, exhaust slit 306, air filling interface 307, jet interface 308, air inlet interface 309, exhaust interface 310, air filling conduit 311, air inlet connector 312, and exhaust one-way valve 313, the air source airflow can be introduced into the flexible air guide pipe 301 through the electromagnetic distribution valve 302 during use, thereby forming a gas barrier on the outside of the flexible air guide pipe 301 to clean and remove welding slag in real time.

[0114] Among them, the pneumatic positioning mechanism also includes:

[0115] Two limiting brackets 404 are fixedly sleeved on the surface of the air guide seat 401, the rubber airbag 402 is located between the two limiting brackets 404, and a connecting seat is fixedly installed on the surface of the rubber airbag 402.

[0116] Rotate the connecting rod 405 between the connecting seat and the support foot 403 to ensure the linkage between the rubber airbag 402 and the support foot 403; and,

[0117] A fixing ring 406 is fixedly fitted onto the inner wall of the rubber airbag 402 to stably fix the rubber airbag 402.

[0118] Among them, the pneumatic positioning mechanism also includes:

[0119] A rubber block 407 is fixedly connected to one end of the support foot 403 to increase the frictional force of the support foot 403 pressing against the inner wall of the valve housing; and,

[0120] A vent hole 408 is formed through the surface of the air guide seat 401 to connect the air guide seat 401 with the interior of the rubber airbag 402.

[0121] With the air guide seat 401, rubber airbag 402, support foot 403, limit bracket 404, connecting rod 405, fixing ring 406, rubber block 407 and vent hole 408, the rubber airbag 402 can push the support foot 403 to unfold during use, so that the device is stably fixed on the inner wall of the valve body, ensuring that the elastic sealing part will not easily fall off when changing position.

[0122] Working principle:

[0123] In use, connect the air inlet connector 312 to the external air source output pipe, retract the elastic sealing piece through the elastic bottom seal 105, place the isolation flame retardant ring 108 on the end face of the valve body near the flange ring welding end, and then insert the elastic sealing piece into the valve body near the flange ring welding end, so that the elastic longitudinal sealing strip 101 is parallel to the inner wall of the valve body, and the surface of the rolling roller 107 is in contact with the inner wall of the valve body, so that the elastic transverse sealing strip 102 presses the isolation flame retardant ring 108 onto the end face of the valve body, while the flame retardant cloth 201 is unfolded.

[0124] Then, the electromagnetic distribution valve 302 is opened, which connects the air inlet 309 and the inflation inlet 307, allowing airflow to enter the air guide seat 401 from the inflation duct 311 and the air inlet channel 304, and then enter the rubber air bag 402 through the vent hole 408 to inflate it. The rubber air bag 402 inflates and expands. When the rubber air bag 402 expands, it presses the support foot 403 to unfold through the connecting rod 405, so that the rubber block 407 is tightly pressed and fixed to the inner wall of the valve body, preventing the elastic sealing part from easily falling off.

[0125] Then, the solenoid distribution valve 302 connects the air inlet 309 with the jet inlet 308, so that the airflow enters the air guide hose 305 from the jet inlet 308, and then enters its interior from both ends of the elastic air guide tube 301, and then sprays out along the exhaust seam 306, thereby forming an outward gas slag removal barrier at the welding position.

[0126] During welding, the elastic sealing piece can be rotated so that the flame-retardant cloth 201 is always located near the weld point to catch the welding slag. The gas slag removal barrier blows most of the welding slag outward, preventing it from easily entering the valve body.

[0127] During disassembly, the switching solenoid distribution valve 302 closes the air inlet port 309 and connects the inflation port 307 to the exhaust port 310. The rubber airbag 402 contracts and squeezes out the gas through its own elasticity. At the same time, the contracted rubber airbag 402 pulls the support foot 403 to contract through the connecting rod 405. Then, the elastic sealing piece is contracted through the elastic bottom seal 105 to remove the device.

[0128] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tooling for valve welding, comprising a valve body and flange rings, wherein the flange rings are respectively disposed on the surfaces of both ends of the valve body for assembly with bolts after welding, characterized in that, include: An elastic sealing mechanism is provided on the valve body near the flange ring welding end. During welding, the elastic sealing mechanism forms a barrier at the inner cavity edge near the valve body weld point. A folding isolation mechanism installed inside the elastic sealing mechanism is used to isolate welding slag that falls into the valve body near the weld point. A flow guiding mechanism is set in the middle of the folding isolation mechanism to guide the airflow to clean the weld slag and move it to the outside of the valve body during welding; and, A pneumatic positioning mechanism is installed in the middle of the flow guiding mechanism to stably install the elastic sealing mechanism, the folding isolation mechanism and the flow guiding mechanism inside the valve body during welding; The flexible edge sealing mechanism includes: An elastic sealing element is snapped onto the valve body near the flange ring welding end, so that it can cover the valve body end by its own elastic adaptive compression during welding; The deployable isolation mechanism includes: The flame-retardant cloth (201) set inside the elastic edge seal unfolds during welding and blocks the welding slag falling into the valve body. When the elastic edge seal shrinks, the flame-retardant cloth (201) folds along with the elastic edge seal. The flow guiding mechanism includes: An elastic air guide tube (301) is provided on the top of the elastic sealing element and an electromagnetic distribution valve (302) is located above the elastic sealing element so that an external air source can be introduced into the elastic air guide tube (301) through the electromagnetic distribution valve (302) during welding. The pneumatic positioning mechanism includes: The air guide seat (401) is located in the middle of the flame-retardant cloth (201) to support the rubber airbag (402) and the support foot (403). A rubber airbag (402) is fixedly installed on the surface of the air guide seat (401) to convert the inflation / deflation state of the gas into the expansion / contraction state of the support foot (403); and, Three support feet (403) located around the rubber airbag (402) are used to fix the pneumatic positioning mechanism inside the valve housing by unfolding the support feet (403).

2. The valve welding fixture according to claim 1, characterized in that, The elastic edge banding includes: The elastic longitudinal sealing strip (101) is snapped onto the inner wall of the valve body to cover the inner wall of the valve body near the flange ring welding end; An integrally formed elastic transverse sealing strip (102) is provided on one side of the elastic longitudinal sealing strip (101) to cover the end face of the valve body near the flange ring welding end; and, A connecting block (103) is integrally set on the side of the elastic longitudinal sealing strip (101) away from the elastic transverse sealing strip (102) to cooperate with the elastic transverse sealing strip (102) to support the support shaft (106).

3. The valve welding fixture according to claim 2, characterized in that, The flexible edge sealing mechanism also includes: The handles (104) are fixedly connected to the two ends of the elastic horizontal sealing strip (102) and the elastic bottom sealing strip (105) is fixedly connected to one end of the handles (104) to provide auxiliary force points when the elastic sealing strip is compressed and shrinks; Multiple support shafts (106) are fixedly inserted between the elastic transverse sealing strip (102) and the connecting block (103), and a rolling roller (107) is movably sleeved on the surface of the multiple support shafts (106) to reduce the resistance between the elastic sealing strip and the valve body when rotating; and, An isolation flame-retardant ring (108) is set between the elastic horizontal sealing strip (102) and the valve body to isolate the elastic horizontal sealing strip (102) and the valve body during welding, so as to prevent the high temperature of the welding torch from welding the two together.

4. The valve welding fixture according to claim 1, characterized in that, The deployable isolation mechanism also includes: An elastic frame (202) is fixedly fitted onto the edge of the flame-retardant fabric (201), and the surface of the elastic frame (202) is fixedly connected to the surface of the elastic longitudinal sealing strip (101) to provide support for the flame-retardant fabric (201); and, A rotating cylinder (203) is fixedly connected to the surface of the elastic frame (202), and the interior of the rotating cylinder (203) is rotatably connected to the surface of the air guide seat (401) so as to support the rotating shaft (204), the first connecting frame (205) and the second connecting frame (206) through the rotating cylinder (203).

5. The valve welding fixture according to claim 4, characterized in that, The deployable isolation mechanism also includes: A rotating shaft (204) is fixedly inserted inside the rotating cylinder (203) to support the first connecting frame (205) and the second connecting frame (206). The first connecting frame (205) and the second connecting frame (206) are rotatably connected to the surface of the rotating shaft (204), and the surfaces of the first connecting frame (205) and the second connecting frame (206) are respectively fixedly connected to the surfaces at both ends of the elastic longitudinal sealing strip (101), so as to connect the elastic longitudinal sealing strip (101) to the rotating cylinder (203) through the rotating shaft (204) and the second connecting frame (206).

6. The valve welding fixture according to claim 1, characterized in that, The flow guiding mechanism also includes: The top cylinder (303) located inside the rotating cylinder (203) and the air inlet channel (304) that runs through both ends of the top cylinder (303) are used to connect the air inlet duct (311) with the air inlet seat (401); Two flexible air guide hoses (305) are located between the two ends of the elastic air guide tube (301) and the electromagnetic distribution valve (302) to connect the electromagnetic distribution valve (302) and the flexible air guide tube (301); and, An exhaust slit (306) is formed through the surface of the air inlet duct (311).

7. The valve welding fixture according to claim 6, characterized in that, The flow guiding mechanism also includes: An air inlet (307) and an air jet inlet (308) are provided on one side of the electromagnetic distribution valve (302), and the air guide hose (305) is fixedly connected to the electromagnetic distribution valve (302) through the air jet inlet (308); An air inlet (309) and an exhaust inlet (310) are located on the other side of the electromagnetic distribution valve (302). An inflation conduit (311) is fixedly installed on the inflation port (307) to connect the electromagnetic distribution valve (302) and the air intake channel (304). An intake connector (312) is fixedly installed on the intake port (309) to assist the electromagnetic distribution valve (302) in connecting to an external air source; and, An exhaust check valve (313) is fixedly installed on the exhaust port (310) to assist the rubber airbag (402) in venting.

8. The valve welding fixture according to claim 1, characterized in that, The pneumatic positioning mechanism also includes: Two limiting brackets (404) are fixedly sleeved on the surface of the air guide seat (401), the rubber airbag (402) is located between the two limiting brackets (404), and a connecting seat is fixedly installed on the surface of the rubber airbag (402); Rotate the connecting rod (405) between the connecting seat and the support foot (403) to ensure the linkage between the rubber airbag (402) and the support foot (403); and, A fixing ring (406) is fixedly fitted onto the inner wall of the rubber airbag (402) to stabilize and fix the rubber airbag (402).

9. The valve welding fixture according to claim 8, characterized in that, The pneumatic positioning mechanism also includes: A rubber block (407) is fixedly connected to one end of the support foot (403) to increase the frictional force of the support foot (403) pressing against the inner wall of the valve housing; and, A vent hole (408) is formed through the surface of the air guide seat (401) to connect the air guide seat (401) with the interior of the rubber airbag (402).

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