A valve welding tool

Abstract

The invention relates to the technical field of welding tools, and in particular to a valve welding tool; the tool can improve the welding efficiency of a valve body and a butt-welding flange, effectively reduce the heat transfer to the valve body during the welding operation, and effectively improve the outlet temperature of carbon dioxide at the welding point, which is more energy-saving and further improves the welding quality; the tool comprises a workbench, two supporting heat-insulating mechanisms, two flange feeding alignment mechanisms for pushing the butt-welding flange to the valve body, two decompression driving welding mechanisms, a steel cylinder containing liquid carbon dioxide, a first gas supply pipe, a connecting pipe and a second gas supply pipe, the supporting heat-insulating mechanism comprises a bracket, an upper half cover body and a lower half cover body fixedly installed on the bracket, the upper half cover body and the lower half cover body are closed to form a closed annular cavity with a pipe portion on the valve body, the upper half cover body and the lower half cover body are both provided with semicircular openings that fit with the pipe portion on the valve body, and the semicircular openings on the upper half cover body and the lower half cover body are closed to form an annular opening.

Description

Technical Field

[0001] The invention relates to the technical field of welding tooling, in particular to a valve welding tooling. Background Art

[0002] As we all know, in the field of valves, butt-weld flange connection is a common connection method. The characteristic of this connection method is that the valve body has butt-weld flanges at both ends, which correspond to the butt-weld flanges on the pipeline and are fixed by bolts. Because of its reliability and applicability, butt-weld flange connection has become one of the most widely used connection forms in valves; and welding tooling is often used to weld the valve body and butt-weld flange.

[0003] For example, Chinese utility model patent CN207788114U discloses a valve flange welding tool, including a base plate, a guide rail, a slider, a push block, a horizontal screw rod, a flange bracket, a horizontal hand wheel, a vertical screw rod, a vertical hand wheel, a flange fixing plate, and connecting screws; the guide rail is arranged on the base plate, the flange bracket is arranged on the slider, and the slider is connected with the guide rail; there is a push block on the flange bracket, the horizontal hand wheel is connected with the horizontal screw rod, the horizontal screw rod is connected with the push block, and the horizontal hand wheel is turned to drive the push block and the flange bracket to move on the guide rail through the horizontal screw rod; the flange fixing plate is connected with the vertical screw rod, the vertical screw rod is connected with the vertical hand wheel, and the vertical hand wheel is turned to rotate the vertical screw rod to drive the flange fixing plate to move up and down; connecting screws are arranged on the flange fixing plate for installing the flange to be welded; two sets of valve flange welding tooling are arranged oppositely on the base plate, and a space is left between the two sets of valve flange welding tooling, and the valve to be welded is placed in the middle; connecting screws are also arranged on the base plate for fixing the valve on the base plate.

[0004] However, when the inventor implemented this device, he found the following defects: the above-mentioned device can only realize the positioning and fixing of the valve body and the butt-welding flange, which is not convenient for welding the valve body and the butt-welding flange, and the welding efficiency is low; and high temperature will be generated during the welding operation of the valve body and the butt-welding flange, causing the temperature at the valve body to rise, and the sealing materials such as silicone in the valve body are mostly non-high-temperature resistant materials. High temperature will cause damage to the sealing materials in the valve body, affecting the quality of the valve after welding; and in order to improve the welding quality of the valve body and the butt-welding flange, carbon dioxide shielded welding is often used for welding. Low temperature and high pressure carbon dioxide have a great influence on the temperature at the welding point, which is not conducive to the melting of the welding material, causing excessive flow of the molten welding material, increasing the energy consumption of the welding operation, and also having a certain impact on the welding quality of the welding point. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a valve welding tooling which improves the welding efficiency of the valve body and the butt-welding flange, effectively reduces the heat transferred to the valve body during the welding operation, and effectively increases the outlet temperature of carbon dioxide at the welding point, which is more energy-efficient and further improves the welding quality.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a valve welding tool, comprising a workbench, two supporting and heat-insulating mechanisms, two flange feeding alignment mechanisms for pushing the welding flange to the valve body, two decompression driving welding mechanisms, a steel cylinder containing liquid carbon dioxide, a first air supply pipe, a connecting pipe and a second air supply pipe, the supporting and heat-insulating mechanisms comprising a bracket, an upper half cover body and a lower half cover body fixedly mounted on the bracket, the upper half cover body and the lower half cover body form a closed annular cavity with the pipe portion on the valve body after being closed, the upper half cover body and the lower half cover body are both provided with a semicircular opening that fits with the pipe portion on the valve body, the semicircular openings on the upper half cover body and the lower half cover body form an annular opening after being closed, and the pipe portion on the valve body is rotatably and sealedly connected with the annular opening.

[0007] The decompression driven welding mechanism includes a vertical frame, a slide slidably mounted on the vertical frame, a lifting drive assembly providing power for the slide to move up and down, an arm mounted on the slide, a steam turbine driver mounted on the arm, a driving wheel rotatably mounted on the arm, and a welding assembly mounted on the arm; the steam turbine driver includes a shell and an impeller rotatably mounted in the shell.

[0008] The upper half cover body is fixedly connected to the slide seat, and the steam turbine driver provides power for the rotation of the driving wheel. One end of the first air supply pipe is connected to the air outlet end of the cylinder, and the other end of the first air supply pipe is connected to the air inlet end of the steam turbine driver. One end of the connecting pipe is connected to the air outlet end of the steam turbine driver, and the other end of the connecting pipe extends into the upper half cover body; one end of the second air supply pipe extends into the upper half cover body, and the other end of the second air supply pipe extends to the welding assembly; further, the lifting drive assembly can adopt other equivalent parts such as a linear motor, a threaded screw assembly or a telescopic cylinder that can drive the slide seat to rise and fall; a connecting frame is provided on the upper half cover body, and the upper half cover body is fixedly connected to the slide seat through the connecting frame; the steam turbine driver is connected to the driving wheel through a transmission belt or the like; the first air supply pipe, the connecting pipe and the second air supply pipe are all provided with flexible pipe parts, and a certain elongation margin is left at the flexible pipe part to avoid interference with the lifting and lowering of the slide seat; the air outlet end of the first air supply pipe faces the blades on the impeller.

[0009] Preferably, the arm is hingedly mounted on a slide, a driving cylinder is hingedly mounted on the slide, and an output end of the driving cylinder is hingedly mounted to the arm.

[0010] Preferably, a bracket is fixedly mounted on the support seat, and supporting wheels located on both sides of the tube portion on the valve body are rotatably mounted on the bracket, and the bracket is located directly below the driving wheel; further, the central axis of the supporting wheel is parallel to the central axis of the tube portion on the valve body.

[0011] Preferably, the welding assembly includes a mounting seat fixedly mounted on the arm, an adjustment seat slidably mounted on the mounting seat, and a welding gun mounted on the adjustment seat, and the mounting seat and the adjustment seat are connected by bolt locking; further, a support frame is provided on the welding gun, and the second gas supply pipe is fixedly mounted on the support frame, and the gas outlet end of the second gas supply pipe faces the welding end of the welding gun.

[0012] Preferably, a sliding rod is provided on the adjustment seat, the welding gun is slidably mounted on the sliding rod, a spring is sleeved on the sliding rod, and the adjustment seat and the welding gun are elastically connected through the spring; further, one end of the spring abuts against the inner wall of the adjustment seat, and the other end of the spring abuts against the welding gun.

[0013] Preferably, it also includes an air motor and a third air supply pipe, the air motor is fixedly mounted on a bracket, a brush wheel is installed at the output end of the air motor, one end of the third air supply pipe extends into the lower half cover, and the other end of the third air supply pipe is connected to the air inlet end of the air motor; further, the brush wheel is in close contact with the connection between the butt-welding flange and the pipe portion on the valve body, and the air outlet end of the air motor faces the connection between the butt-welding flange and the pipe portion on the valve body.

[0014] Preferably, the flange feed alignment mechanism includes a feed seat, a chuck rotatably mounted on the feed seat, and a feed driver that provides power for the feed seat to slide; further, the feed driver can adopt a telescopic cylinder, a linear motor or other equivalent parts that drive the feed seat to feed.

[0015] Preferably, a speed regulator is installed on the feed seat, and the speed regulator includes a brake pad fixedly connected to the chuck and a pneumatic brake assembly fixedly installed on the feed seat and covering the edge of the brake pad, the pneumatic brake assembly includes a U-shaped shell seat, a sliding cavity arranged on the U-shaped shell seat, a piston slidably installed in the sliding cavity, a resistance plate fixedly connected to the piston and a fourth air supply pipe, one end of the fourth air supply pipe is connected to the air outlet end of the cylinder, and the other end of the fourth air supply pipe is connected to the inside of the sliding cavity, a first pressure regulating valve is installed on the fourth air supply pipe, and a pressure relief valve connected to the sliding cavity is provided on the U-shaped shell seat.

[0016] Preferably, a second pressure regulating valve is installed on the first gas supply pipe, and a third pressure regulating valve is installed on the second gas supply pipe.

[0017] Preferably, graphite sealing gaskets are provided on the inner wall of the semicircular opening and at the joints between the upper half cover body and the lower half cover body.

[0018] Beneficial effects: Compared with the prior art, the present invention provides a valve welding tool with the following beneficial effects: the valve welding tool, by placing the pipe portion of the valve body in the semicircular openings on the two lower half-covers, starting the lifting drive assembly, the slide seat moves down, the upper half-cover and the lower half-cover are completely closed and cover the pipe portion of the valve body, the bottom of the driving wheel is in close contact with the upper part of the pipe portion on the valve body, the flange feeding alignment mechanism sends the butt-welding flange to the pipe portion of the valve body, the butt-welding flange and the pipe portion on the valve body are connected as a whole, the liquid carbon dioxide in the cylinder enters the shell through the first gas supply pipe and is quickly gasified, the gasified carbon dioxide contacts the impeller and drives the impeller to rotate, thereby driving the driving wheel to rotate, the driving wheel drives the valve body to rotate, so that the welding assembly performs ring welding on the annular seam between the pipe portion and the flange on the valve body, and the gasified carbon dioxide absorbs heat and cools down the surrounding environment, after cooling The carbon dioxide enters the annular cavity through the connecting pipe. The low-temperature carbon dioxide in the annular cavity can cool down the pipe part of the valve body that is heated by welding, so as to reduce the further transfer of heat to the inside of the valve body. At the same time, the carbon dioxide absorbs heat in the annular cavity and is ejected through the outlet end of the second air supply pipe. The carbon dioxide that has absorbed heat and heated up protects the welding points of the welding components to reduce the oxygen content. In this process, the temperature difference between the carbon dioxide and the welding point is greatly reduced; the welding efficiency of the valve body and the butt-welded flange is improved, the heat transfer to the valve body is effectively reduced during the welding operation, and the outlet temperature of the carbon dioxide at the welding point is effectively increased, which reduces the temperature effect of carbon dioxide on the welding point, and fully utilizes the pressure of the carbon dioxide in the cylinder to convert it into the driving power of the impeller, which is more energy-saving; it effectively reduces the contact between oxygen and the welding point, reduces the oxidation of welding materials, and further improves the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the present invention

[0020] Figure 2 It is a schematic diagram of the top plan structure of the present invention;

[0021] Figure 3 The present invention Figure 2 Schematic diagram of the cross-section structure at AA in the middle;

[0022] Figure 4 The present invention Figure 3 Schematic diagram of the cross-section structure at BB in the middle;

[0023] Figure 5 The present invention Figure 3 Schematic diagram of the cross-section structure at CC;

[0024] Figure 6 It is a schematic diagram of the planar structure of the speed regulator of the present invention;

[0025] Figure 7 The present invention Figure 6 Schematic diagram of the cross-section structure at DD in the middle;

[0026] Figure 8 The present invention Figure 1 The schematic diagram of the local enlarged structure at E in the middle;

[0027] Fig. 9 The present invention Figure 3 The schematic diagram of the partial enlarged structure at F in the middle;

[0028] The markings in the attached drawings are: 1, workbench; 2, steel cylinder; 3, first air supply pipe; 4, connecting pipe; 5, second air supply pipe; 6, bracket; 7, upper half cover; 8, lower half cover; 9, ring mouth; 10, slide seat; 11, lifting drive assembly; 12, arm; 13, driving wheel; 14, shell; 15, impeller; 16, driving cylinder; 17, bracket; 18, supporting wheel; 19, mounting seat; 20, adjustment seat; 21, welding gun; 22, Slide rod; 23. Spring; 24. Pneumatic motor; 25. Third air supply pipe; 26. Brush wheel; 27. Feed seat; 28. Chuck; 29. ​​Feed driver; 30. Brake pad; 31. U-shaped shell seat; 32. Slide cavity; 33. Piston; 34. Resistance plate; 35. Fourth air supply pipe; 36. First pressure regulating valve; 37. Pressure relief valve; 38. Second pressure regulating valve; 39. Third pressure regulating valve; 40. Graphite sealing gasket; 41. Vertical frame. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the invention, the technical solutions in the embodiments of the invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the invention. Obviously, the described embodiments are only embodiments of a part of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the invention.

[0030] A valve flange welding tool as described in the background technology; the above-mentioned device can only realize the alignment and fixation of the valve body and the butt-welding flange, which is not convenient for welding the valve body and the butt-welding flange, and the welding efficiency is low; and the welding operation of the valve body and the butt-welding flange will generate high temperature, causing the temperature of the valve body to rise, and the sealing materials such as silicone in the valve body are mostly non-high-temperature resistant materials. High temperature will cause damage to the sealing materials in the valve body, affecting the quality of the valve after welding; and in order to improve the welding quality of the valve body and the butt-welding flange, carbon dioxide shielded welding is often used for welding. Low temperature and high pressure carbon dioxide have a great influence on the temperature at the welding point, which is not conducive to the melting of the welding material, causing excessive flow of the molten welding material, increasing the energy consumption of the welding operation, and also having a certain impact on the welding quality of the welding point.

[0031] In order to solve this technical problem, the present invention provides a valve welding tool, which is used for welding the two ends of the valve body pipe part and the butt welding flange.

[0032] It should be noted that, in the absence of conflict, the embodiments of the invention and the features and technical solutions in the embodiments may be combined with each other.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] Example 1: For details, please refer to Figure 1-5 The valve welding tooling specifically includes: a workbench 1, two supporting insulation mechanisms, two flange feeding alignment mechanisms for pushing the welding flange to the valve body, two decompression driving welding mechanisms, a cylinder 2 containing liquid carbon dioxide, a first gas supply pipe 3, a connecting pipe 4 and a second gas supply pipe 5, the supporting insulation mechanism includes a bracket 6, an upper half cover 7 and a lower half cover 8 fixedly installed on the bracket 6, the upper half cover 7 and the lower half cover 8 are closed to form a closed annular cavity with the pipe part on the valve body, the upper half cover 7 and the lower half cover 8 are both provided with semicircular openings that fit with the pipe part on the valve body, the semicircular openings on the upper half cover 7 and the lower half cover 8 are closed to form a ring opening 9, and the pipe part on the valve body is rotatably sealed and connected with the ring opening 9.

[0035] The decompression driven welding mechanism includes a vertical frame 41, a slide 10 slidably mounted on the vertical frame 41, a lifting drive assembly 11 providing power for the slide 10 to move up and down, an arm 12 mounted on the slide 10, a steam turbine driver mounted on the arm 12, a driving wheel 13 rotatably mounted on the arm 12, and a welding assembly mounted on the arm 12; the steam turbine driver includes a shell 14 and an impeller 15 rotatably mounted in the shell 14.

[0036] The upper half cover 7 is fixedly connected to the slide 10, and the steam turbine driver provides power for the rotation of the driving wheel 13. One end of the first air supply pipe 3 is connected to the air outlet end of the cylinder 2, and the other end of the first air supply pipe 3 is connected to the air inlet end of the steam turbine driver. One end of the connecting pipe 4 is connected to the air outlet end of the steam turbine driver, and the other end of the connecting pipe 4 extends into the upper half cover 7; one end of the second air supply pipe 5 extends into the upper half cover 7, and the other end of the second air supply pipe 5 extends to the welding assembly; further, the lifting drive assembly 11 can adopt other equivalent parts such as a linear motor, a threaded screw assembly or a telescopic cylinder that can drive the slide 10 to rise and fall; the upper half cover 7 A connecting frame is provided on it, and the upper half cover 7 is fixedly connected to the slide 10 through the connecting frame; the steam turbine driver is connected to the driving wheel 13 through a transmission belt or the like; the first air supply pipe 3, the connecting pipe 4 and the second air supply pipe 5 are all provided with flexible pipe parts, and a certain elongation margin is left at the flexible pipe parts to avoid interference with the lifting and lowering of the slide 10; the air outlet end of the first air supply pipe 3 faces the blades on the impeller 15; it should be noted that in the initial state, the butt-welding flange and the pipe part on the valve body are interference-fitted or the butt-welding flange and the pipe part on the valve body are spot-welded by a welding gun 21 to ensure that the valve body and the butt-welding flange rotate synchronously to avoid relative rotation between the two.

[0037] For details, please refer to Figure 5 The arm 12 is hingedly mounted on the slide 10 , a driving cylinder 16 is hingedly mounted on the slide 10 , and an output end of the driving cylinder 16 is hingedly mounted to the arm 12 .

[0038] For details, please refer to Figure 5 A bracket 17 is fixedly mounted on the bracket 6, and supporting wheels 18 located on both sides of the tube portion on the valve body are rotatably mounted on the bracket 17. The bracket 17 is located directly below the driving wheel 13; further, the central axis of the supporting wheel 18 is parallel to the central axis of the tube portion on the valve body.

[0039] For details, please refer to Fig. 9 The welding assembly includes a mounting seat 19 fixedly mounted on the arm 12, an adjusting seat 20 slidably mounted on the mounting seat 19, and a welding gun 21 mounted on the adjusting seat 20, and the mounting seat 19 and the adjusting seat 20 are connected by bolt locking; further, a support frame is provided on the welding gun 21, and the second gas supply pipe 5 is fixedly mounted on the support frame, and the gas outlet end of the second gas supply pipe 5 faces the welding end of the welding gun 21, and an arc-shaped slide groove is provided on the mounting seat 19, and the adjusting seat 20 is slidably mounted in the arc-shaped slide groove, and the mounting seat 19 and the adjusted adjusting seat 20 are locked by bolts.

[0040] For details, please refer to Fig. 9A slide bar 22 is provided on the adjustment seat 20, and the welding gun 21 is slidably installed on the slide bar 22. A spring 23 is sleeved on the slide bar 22, and the adjustment seat 20 and the welding gun 21 are elastically connected through the spring 23; further, one end of the spring 23 abuts against the inner wall of the adjustment seat 20, and the other end of the spring 23 abuts against the welding gun 21.

[0041] The valve welding tool provided in this embodiment drives the arm 12 to rotate around the hinge point through the drive cylinder 16, and the contact tightness between the drive wheel 13 and the pipe part on the valve body can be adjusted to ensure good contact between the drive wheel 13 and the pipe part on the valve body; in specific implementation, after the upper half cover 7 and the lower half cover 8 are closed, the drive cylinder 16 is started again, so that the drive wheel 13 is in close contact with the upper part of the pipe part on the valve body, so as to avoid interference between the drive wheel 13 and the closing between the upper half cover 7 and the lower half cover 8 , ensuring that the upper half cover 7 and the lower half cover 8 are well closed; the pipe portion on the valve body is placed on the supporting wheel 18. Under the action of the supporting wheel 18, when the driving wheel 13 presses down on the pipe portion of the valve body, the pressure between the pipe portion on the valve body and the lower half cover 8 can be reduced, avoiding excessive friction between the pipe portion on the valve body and the upper half cover 7 and the lower half cover 8, so as to ensure that the pipe portion on the valve body rotates smoothly between the upper half cover 7 and the lower half cover 8, and at the same time ensure good transmission between the driving wheel 13 and the pipe portion on the valve body.

[0042] By adjusting the angle between the adjustment seat 20 and the mounting seat 19, the inclination angle of the welding gun 21 can be adjusted so that the welding gun 21 and the welding point are at a suitable inclination angle; when the multi-layer welding of the annular seam between the pipe portion on the valve body and the butt-welding flange is performed, as the thickness of the welding layer increases, the welding gun 21 can automatically move up along the slide rod 22, and the spring 23 can ensure that the wire outlet end of the welding gun 21 is in close contact with the welding point, thereby avoiding interference of the welding wire with the rotation of the valve body and ensuring that the welding wire maintains good elastic contact with the welding point to be welded.

[0043] Example 2: The valve welding tooling provided in Example 1 is further optimized. For details, please refer to Fig. 9 , also includes an air motor 24 and a third air supply pipe 25. The air motor 24 is fixedly mounted on the bracket 6. A brush wheel 26 is installed at the output end of the air motor 24. One end of the third air supply pipe 25 extends into the lower half cover 8, and the other end of the third air supply pipe 25 is connected to the air inlet end of the air motor 24; further, the brush wheel 26 is in close contact with the connection between the butt-welding flange and the pipe portion on the valve body, and the air outlet end of the air motor 24 faces the connection between the butt-welding flange and the pipe portion on the valve body.

[0044] The valve welding tool provided in this embodiment utilizes the pre-pressure of carbon dioxide in the annular cavity to drive the pneumatic motor 24 to rotate. The pneumatic motor 24 drives the brush wheel 26 to sweep away the welding slag and smoke attached to the butt-welding flange, the pipe part on the valve body and the weld, so as to ensure the cleanliness of the weld, improve the connection strength between each welding layer, and improve the welding quality. Part of the carbon dioxide gas discharged by the pneumatic motor 24 is gathered around the weld, isolating the oxygen around the weld, further reducing the oxidation amount of the welding material, thereby further improving the welding quality of the valve body and the butt-welding flange.

[0045] Example 3: The valve welding tooling provided in Example 2 is further optimized. For details, please refer to Figure 1 or Figure 2 The flange feed alignment mechanism includes a feed seat 27, a chuck 28 rotatably mounted on the feed seat 27, and a feed driver 29 that provides power for the feed seat 27 to slide; further, the feed driver 29 can adopt a telescopic cylinder, a linear motor or other equivalent parts that drive the feed seat 27 to feed.

[0046] For details, please refer to Figure 6-7 A speed regulator is installed on the feed seat 27, and the speed regulator includes a brake pad 30 fixedly connected to the chuck 28 and a pneumatic brake assembly fixedly installed on the feed seat 27 and covering the edge of the brake pad 30. The pneumatic brake assembly includes a U-shaped shell seat 31, a sliding cavity 32 arranged on the U-shaped shell seat 31, a piston 33 slidably installed in the sliding cavity 32, a resistance plate 34 fixedly connected to the piston 33, and a fourth air supply pipe 35, one end of the fourth air supply pipe 35 is connected to the air outlet end of the cylinder 2, and the other end of the fourth air supply pipe 35 is connected to the inside of the sliding cavity 32. A first pressure regulating valve 36 is installed on the fourth air supply pipe 35, and a pressure relief valve 37 connected to the sliding cavity 32 is provided on the U-shaped shell seat 31.

[0047] For details, please refer to Figure 1 and Figure 8 A second pressure regulating valve 38 is installed on the first air supply pipe 3 , and a third pressure regulating valve 39 is installed on the second air supply pipe 5 .

[0048] For details, please refer to Fig. 9 The inner wall of the semicircular opening and the joints between the upper half cover body 7 and the lower half cover body 8 are provided with a graphite sealing gasket 40.

[0049] The valve welding tool provided in this embodiment clamps the butt-welding flange through the chuck 28 and then starts the feed driver 29. The feed driver 29 on the two flange feed alignment mechanism drives the flange to approach the pipe part on the valve body until the pipe part on the valve body is inserted into the butt-welding flange, thereby realizing the automatic assembly of the butt-welding flange and the pipe part on the valve body. When the valve body and the butt-welding flange are welded, the amount of carbon dioxide passing through the fourth air supply pipe 35 can be adjusted by adjusting the opening size of the first pressure regulating valve 36, thereby adjusting the pressure in the sliding cavity 32. When the pressure in the sliding cavity 32 increases, the piston 33 drives the resistance plate 34 to contact the brake pad 30. When the pressure in the sliding cavity 32 increases, the pressure relief valve 37 is opened, thereby adaptively adjusting the rotation speed of the chuck 28. The second pressure regulating valve 38 can be adjusted to adjust the pressure of carbon dioxide passing through the first air supply pipe 3, thereby adjusting the pressure of carbon dioxide gas entering the shell 14. The intake pressure of carbon dioxide changes, the rotation speed of the impeller 15 changes, and then the rotation speed of the pipe part on the valve body driven by the driving wheel 13 is adjusted to ensure that the welding wire discharge speed on the welding gun 21 matches the welding speed of the valve body, thereby ensuring the welding quality; the graphite sealing gasket 40 has a good sealing effect to reduce the leakage of carbon dioxide in the annular cavity. At the same time, the graphite sealing gasket 40 can effectively reduce the friction between the upper half cover body 7 and the lower half cover body 8 and the pipe part on the valve body, avoid interference with the rotation of the valve body, and ensure that the valve body rotates smoothly between the upper half cover body 7 and the lower half cover body 8.

[0050] The use process of the valve welding tool provided by the present invention is as follows: by placing the pipe part of the valve body in the semicircular openings on the two lower half-cover bodies 8, the butt-welding flange is sent to the pipe part on the valve body through the two flange feeding and positioning mechanisms, and the butt-welding flange and the pipe part on the valve body are initially consolidated; start the lifting drive component 11, the slide seat 10 moves down, the upper half cover body 7 and the lower half cover body 8 are completely closed and cover the pipe part of the valve body, the bottom of the driving wheel 13 is in close contact with the upper part of the pipe part on the valve body, the flange feeding and positioning mechanism sends the butt-welding flange to the pipe part of the valve body, the butt-welding flange and the pipe part on the valve body are connected as a whole, and the liquid carbon dioxide in the cylinder 2 enters the shell 14 through the first gas supply pipe 3 and is quickly gasified The gasified carbon dioxide contacts the impeller 15 and drives the impeller 15 to rotate, thereby driving the driving wheel 13 to rotate, and the driving wheel 13 drives the valve body to rotate, so that the welding assembly performs ring welding on the annular seam between the pipe part and the flange on the valve body, and the gasified carbon dioxide absorbs heat and cools down the surrounding environment, and the cooled carbon dioxide enters the annular cavity through the connecting pipe 4. The low-temperature carbon dioxide in the annular cavity can cool down the pipe part on the valve body that is heated due to welding, and at the same time, the carbon dioxide absorbs heat in the annular cavity and is ejected through the gas outlet end of the second gas supply pipe 5. The carbon dioxide that absorbs heat and heats up protects the welding points of the welding assembly; in this way, the ring welding operation of the butt-welded flange and the valve body is completed.

[0051] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be mechanically connected, electrically connected, or able to communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

Claims

1. A valve welding tool, characterized in that: The invention comprises a workbench (1), two supporting heat-insulating mechanisms, two flange feeding alignment mechanisms for pushing the welding flanges to feed toward the valve body, two pressure-reducing driving welding mechanisms, a steel cylinder (2) containing liquid carbon dioxide, a first gas supply pipe (3), a connecting pipe (4) and a second gas supply pipe (5), wherein the supporting heat-insulating mechanism comprises a support seat (6), an upper half cover body (7) and a lower half cover body (8) fixedly mounted on the support seat (6), wherein the upper half cover body (7) and the lower half cover body (8) form a closed annular cavity with the pipe portion on the valve body when the upper half cover body (7) and the lower half cover body (8) are closed, and a semicircular opening that fits with the pipe portion on the valve body is provided on the upper half cover body (7) and the lower half cover body (8), and a ring opening (9) is formed when the semicircular openings on the upper half cover body (7) and the lower half cover body (8) are closed, and the pipe portion on the valve body is rotatably sealedly connected with the ring opening (9); The decompression driven welding mechanism comprises a vertical frame (41), a slide seat (10) slidably mounted on the vertical frame (41), a lifting drive assembly (11) providing power for the slide seat (10) to move up and down, an arm frame (12) mounted on the slide seat (10), a steam turbine driver mounted on the arm frame (12), a driving wheel (13) rotatably mounted on the arm frame (12), and a welding assembly mounted on the arm frame (12); the steam turbine driver comprises a housing (14) and an impeller (15) rotatably mounted in the housing (14); The upper half housing (7) is fixedly connected to the slide seat (10); the steam turbine driver provides power for the rotation of the driving wheel (13); one end of the first air supply pipe (3) is connected to the air outlet end of the cylinder (2); the other end of the first air supply pipe (3) is connected to the air inlet end of the steam turbine driver; one end of the connecting pipe (4) is connected to the air outlet end of the steam turbine driver; the other end of the connecting pipe (4) extends into the upper half housing (7); one end of the second air supply pipe (5) extends into the upper half housing (7); the other end of the second air supply pipe (5) extends to the welding assembly.

2. The valve welding tool according to claim 1, characterized in that: The arm (12) is hingedly mounted on the slide (10), a drive cylinder (16) is hingedly mounted on the slide (10), and an output end of the drive cylinder (16) is hingedly mounted to the arm (12).

3. The valve welding tool according to claim 2, characterized in that: A bracket (17) is fixedly mounted on the bracket seat (6), and supporting wheels (18) located on both sides of the pipe portion on the valve body are rotatably mounted on the bracket (17), and the bracket (17) is located directly below the driving wheel (13).

4. The valve welding tool according to claim 1, characterized in that: The welding assembly comprises a mounting seat (19) fixedly mounted on the arm (12), an adjusting seat (20) slidably mounted on the mounting seat (19), and a welding gun (21) mounted on the adjusting seat (20); the mounting seat (19) and the adjusting seat (20) are connected by bolt locking.

5. The valve welding tool according to claim 4, characterized in that: The adjustment seat (20) is provided with a slide bar (22), the welding gun (21) is slidably mounted on the slide bar (22), a spring (23) is sleeved on the slide bar (22), and the adjustment seat (20) and the welding gun (21) are elastically connected via the spring (23).

6. The valve welding tool according to claim 1, characterized in that: It also includes an air motor (24) and a third air supply pipe (25), wherein the air motor (24) is fixedly mounted on the bracket (6), a brush wheel (26) is mounted on the output end of the air motor (24), one end of the third air supply pipe (25) extends into the lower half cover (8), and the other end of the third air supply pipe (25) is connected to the air inlet end of the air motor (24).

7. The valve welding tool according to claim 1, characterized in that: The flange feed alignment mechanism comprises a feed seat (27), a chuck (28) rotatably mounted on the feed seat (27), and a feed driver (29) providing power for the feed seat (27) to slide.

8. The valve welding tool according to claim 7, characterized in that: A speed regulator is installed on the feed seat (27), and the speed regulator includes a brake pad (30) fixedly connected to the chuck (28) and a pneumatic brake assembly fixedly installed on the feed seat (27) and covering the edge of the brake pad (30), the pneumatic brake assembly includes a U-shaped shell seat (31), a sliding cavity (32) arranged on the U-shaped shell seat (31), a piston (33) slidably installed in the sliding cavity (32), a resistance plate (34) fixedly connected to the piston (33) and a fourth air supply pipe (35), one end of the fourth air supply pipe (35) is connected to the air outlet end of the cylinder (2), and the other end of the fourth air supply pipe (35) is connected to the inside of the sliding cavity (32), a first pressure regulating valve (36) is installed on the fourth air supply pipe (35), and a pressure relief valve (37) connected to the sliding cavity (32) is provided on the U-shaped shell seat (31).

9. The valve welding tool according to claim 8, characterized in that: A second pressure regulating valve (38) is installed on the first air supply pipe (3), and a third pressure regulating valve (39) is installed on the second air supply pipe (5).

10. The valve welding tool according to claim 1, characterized in that: A graphite sealing gasket (40) is provided on the inner wall of the semicircular opening and at the joint between the upper half cover body (7) and the lower half cover body (8).

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