A post-welding device for high-pound-class valves after precision casting

Abstract

The present invention discloses a post-welding equipment for high-pound-class valve precision casting, belonging to the technical field of valve post-welding. The technical key points are as follows: It includes a workbench. By means of the set positioning and clamping mechanism, the valve can be limited, clamped and fixed, thus facilitating subsequent airtightness testing and subsequent post-welding processing, providing great convenience for subsequent use. Through the set automatic sealing mechanism, automatic clamping and sealing treatment of the valve can be realized, reducing the time and error of manual operation, and improving the detection speed and accuracy. Through the set station switching mechanism, the valve can be switched from the station for detecting airtightness to the station for post-welding processing, and post-welding processing can be carried out without manually disassembling the clamping and positioning tooling outside the valve again, greatly improving the welding processing efficiency of post-welding processing, significantly shortening the production cycle, and reducing the production cost. It has the advantages of being convenient for airtightness testing and post-welding processing and having high working efficiency.

Description

Technical Field

[0001] The present invention relates to the field of valve repair welding, and more particularly to a post-welding equipment for precision casting of high-pound valves. Background Art

[0002] With the rapid development of modern industry, high-pound valves, as key components in the fluid control field, their quality and reliability are crucial for ensuring the safe operation of industrial systems. At the same time, as an indispensable part of the fluid control system, the sealing performance of valves directly affects the safety and stability of the entire system.

[0003] However, due to the limitations of casting processes and the non-uniformity of raw materials, various defects such as pores, cracks, and shrinkage porosity are inevitable during the precision casting of high-pound valves, which reduces the sealing performance of the valves and even leads to safety hazards such as leakage. To ensure the quality and performance of valves, these defects must be repaired by welding in a timely manner. Currently, existing methods for detecting the airtightness of valves mostly involve manually sealing the valves and then manually immersing them in water to detect the airtightness. Welding repairs are then carried out at the locations where bubbles appear on the valves. Both the airtightness test and the welding clamping waste a large amount of time and labor costs, and the work efficiency is low, unable to meet the actual usage requirements.

[0004] Therefore, there is a need to provide a post-welding equipment for precision casting of high-pound valves to address the above problems. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the embodiments of the present invention is to provide a post-welding equipment for precision casting of high-pound valves, aiming to solve the technical problems raised in the background art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A post-welding equipment for precision casting of high-pound valves includes a workbench, with support feet for support at the bottom of the workbench. A water tank for airtightness detection is provided on the workbench, and a transparent glass for observation is provided on the water tank. It further includes:

[0008] A positioning and clamping mechanism, which is movably installed on the workbench and is used for positioning and clamping the valve. The positioning and clamping mechanism includes a support seat and a placement seat for limiting and clamping the valve. The placement seat is slidably connected to the support seat in a limited manner, and a limiting groove for clamping and limiting is provided at the connection between the placement seat and the support seat. The support seat is movably installed on a support frame;

[0009] An automatic sealing mechanism is installed on a support base. The automatic sealing mechanism includes a flap for automatically sealing the port of a valve. The flap is movably installed on the support base. A docking post for sealing and docking with the valve port is provided on the flap. An annular airbag for internal sealing of the valve is wrapped and connected to the outside of the docking post. And a sealing valve cover for sealing is adaptively installed and connected to the valve.

[0010] A station switching mechanism is installed on a workbench and connected to a support frame, and is used for switching the stations of the support frame, turning the station for sealing detection to the welding station. The station switching mechanism includes a turning frame for flipping the station. A first contact block and a second contact block for triggering the lifting of the support base are provided on the turning frame.

[0011] As a further solution of the present invention, the automatic sealing mechanism further includes a first conductive block and a second conductive block for placing the valve for conductive triggering of sealing. The first conductive block is fixedly connected to a toothed plate through a guiding connection block. The toothed plate is fixedly connected to one end of a placing seat. The second conductive block is fixedly connected to the inside of the support base and is adaptively docked with the first conductive block. A return spring is provided at the connection between one end of the toothed plate and the inside of the support base, and the elastic force of the return spring is much smaller than the gravity of the valve.

[0012] As a further solution of the present invention, the automatic sealing mechanism further includes a second connecting shaft for driving the flap to flip and dock. The flap is rotatably installed on the support base through the second connecting shaft. A worm gear is fixedly connected to the second connecting shaft. A worm is meshed and connected to the worm gear. The worm is rotatably installed inside the support base. The worm is rotationally connected to a first connecting shaft through a synchronous belt.

[0013] As a further solution of the present invention, the automatic sealing mechanism further includes a first gear for driving the rotation of the first connecting shaft. A second gear is fixedly connected to the first connecting shaft. And the second gear is rotatably installed inside the support base through the first connecting shaft. The second gear is meshed and connected to the first gear. The first gear is rotatably installed inside the support base, and the first gear is meshed and connected to the toothed plate. The diameter of the first gear is larger than that of the second gear, and the second gear and the toothed plate do not contact each other.

[0014] As a further solution of the present invention, the automatic sealing mechanism further includes a test inlet pipe for injecting gas for detection and an airbag inlet pipe for injecting filling gas into the annular airbag. The test inlet pipe is disposed through the docking post. Solenoid valves are provided on both the test inlet pipe and the airbag inlet pipe. First sealing rings and second sealing rings for sealing connection are provided on the outside of the annular airbag. An avoidance hole for avoiding the annular airbag is provided on the support base.

[0015] As a further solution of the present invention, the station switching mechanism further includes a telescopic cylinder for lifting the support seat. A first connecting plate is fixedly connected to the support seat. A second connecting plate is slidably connected in a limited manner within the first connecting plate. The telescopic cylinder is fixedly installed inside the second connecting plate, and the piston rod of the telescopic cylinder is connected to the inside of the first connecting plate. The second connecting plate is rotatably installed at one end of the flipping frame through a third connecting shaft.

[0016] As a further solution of the present invention, the station switching mechanism further includes a second motor for rotating and controlling the flipping frame. The flipping frame is rotatably installed on the workbench through a rotating seat. Reinforcing ribs are provided on the flipping frame. One end of the flipping frame is fixedly connected to the output shaft of the second motor, and the second motor is fixedly installed on the rotating seat.

[0017] As a further solution of the present invention, the station switching mechanism further includes a positioning post and a magnet for welding positioning and installation. Both the positioning post and the magnet are fixedly connected to one side of the support frame. An installation seat is provided on the workbench. A positioning groove for adaptively installing and connecting the positioning post is provided on the installation seat. A fixing groove for adaptively installing and connecting the magnet is also provided on the installation seat. An electromagnet is provided in the fixing groove. First support posts and second support posts are also provided on the workbench. A first proximity switch adapted to be connected to the first contact block is provided on the first support post. A second proximity switch adapted to be connected to the second contact block is provided on the second support post.

[0018] As a further solution of the present invention, the station switching mechanism further includes a welding robot for welding. The welding robot is installed on the moving seat. The moving seat is slidably connected to the workbench in a limited manner through a second guide rod, and the moving seat is threadedly connected to the driving screw. The driving screw is rotatably installed on the workbench. The driving screw is fixedly connected to the output shaft of the third motor, and the third motor is fixedly installed outside the workbench.

[0019] As a further solution of the present invention, the positioning and clamping mechanism further includes a bidirectional lead screw for driving the support seat to move and be controlled. The support seat is slidably connected to the support frame in a limited manner through a first guide rod, and the support seat is threadedly connected to the bidirectional lead screw. The bidirectional lead screw is rotatably connected to the support frame. The bidirectional lead screw is fixedly connected to the output shaft of the first motor, and the first motor is fixedly installed outside the support frame through a waterproof cover.

[0020] In summary, the embodiments of the present invention have the following beneficial effects compared with the prior art:

[0021] The positioning and clamping mechanism provided by the present invention can complete the limit clamping and fixation of the valve, thus facilitating subsequent sealing tests and subsequent repair welding processing, providing great convenience for subsequent use.

[0022] The automatic sealing mechanism provided can achieve automatic clamping and sealing treatment of the valve, thus facilitating the observation of the airtightness and leakage of the valve in water, enabling targeted repair welding treatment, eliminating the need for manual multiple filling and sealing, reducing labor, reducing the time and error of manual operation, improving the detection speed and accuracy, and thus enhancing the overall production efficiency.

[0023] The station switching mechanism provided can switch the valve from the airtightness detection station to the repair welding processing station, enabling repair welding processing without the need for manual re-dismantling of the clamping and positioning tooling on the outside of the valve, greatly improving the welding processing efficiency of the repair welding, being able to quickly and accurately complete the repair welding work, significantly shortening the production cycle, reducing the production cost, and thus improving the economic benefits of the enterprise.

[0024] To more clearly elaborate the structural features and functions of the present invention, the following will combine the drawings with specific embodiments to elaborate on the present invention in detail. Brief Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of an embodiment of the invention.

[0026] Figure 2 It is Figure 1 An enlarged structural diagram of A in

[0027] Figure 3 It is a schematic structural diagram of the state when the valve rotates to the welding station in an embodiment of the invention.

[0028] Figure 4 It is a schematic side view structural diagram of the valve rotating to the welding station in an embodiment of the invention.

[0029] Figure 5 It is Figure 4 An enlarged structural diagram of B in

[0030] Figure 6 It is an exploded structural diagram of the side connection of the support frame in an embodiment of the invention.

[0031] Figure 7 It is a schematic connection structural diagram of the bottom of the support frame in an embodiment of the invention.

[0032] Figure 8 It is a schematic connection structural diagram inside the first connecting plate in an embodiment of the invention.

[0033] Figure 9Schematic diagram of the connection structure of the placement seat in the invention embodiment.

[0034] Figure 10 Schematic diagram of the connection structure inside the support seat in the invention embodiment.

[0035] Figure 11 For Figure 10 Enlarged structure diagram of C in

[0036] Figure 12 Schematic diagram of the side view structure of the internal connection of the support seat in the invention embodiment.

[0037] Figure 13 For Figure 12 Enlarged structure diagram of D in

[0038] Reference numerals: 1, workbench; 2, water tank; 3, valve; 4, sealed valve cover; 5, support frame; 6, support seat; 7, bidirectional lead screw; 8, first motor; 9, waterproof cover; 10, first guide rod; 11, first connecting plate; 12, second connecting plate; 13, telescopic cylinder; 14, placement seat; 15, limiting groove; 16, avoidance hole; 17, toothed plate; 18, first gear; 19, second gear; 20, first connecting shaft; 21, synchronous belt; 22, worm; 23, worm gear; 24, second connecting shaft; 25, flap; 26, docking column; 27, test intake pipe; 28, airbag intake pipe; 29, annular airbag; 30, first sealing ring; 31, second sealing ring; 32, third connecting shaft; 33, flipping frame; 34, reinforcing rib; 35, rotating seat; 36, second motor; 37, first support column; 38, first proximity switch; 39, first contact block; 40, second contact block; 41, second proximity switch; 42, second support column; 43, magnet; 44, positioning column; 45, positioning groove; 46, fixing groove; 47, electromagnet; 48, moving seat; 49, welding robot; 50, driving screw; 51, second guide rod; 52, third motor; 53, support foot; 54, guiding connection block; 55, first conductive block; 56, second conductive block; 57, return spring; 58, mounting seat. Detailed implementation manners

[0039] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] The following describes the specific implementation of the present invention in detail with reference to specific embodiments.

[0041] Embodiment 1

[0042] Refer to Figures 1 to 9, A post-welding device for high-pound valves after precision casting, including a workbench 1. At the bottom of the workbench 1, there are support feet 53 for support. On the workbench 1, there is a water tank 2 for airtightness detection. On the water tank 2, there is a transparent glass for observation. It also includes:

[0043] A positioning and clamping mechanism, which is movably installed on the workbench 1 and is used to position and clamp the valve 3. The positioning and clamping mechanism includes a support seat 6 and a placement seat 14 for limiting and clamping the valve 3. The placement seat 14 is slidably connected to the support seat 6 in a limited manner. At the connection between the placement seat 14 and the support seat 6, there is a limit groove 15 for clamping and limiting. The support seat 6 is movably installed on the support frame 5.

[0044] Furthermore, the positioning and clamping mechanism further includes a bidirectional lead screw 7 for driving the support seat 6 to move and control. The support seat 6 is slidably connected to the support frame 5 in a limited manner through a first guide rod 10, and the support seat 6 is threadedly connected to the bidirectional lead screw 7. The bidirectional lead screw 7 is rotatably connected to the support frame 5. The bidirectional lead screw 7 is fixedly connected to the output shaft of a first motor 8. The first motor 8 is fixedly installed outside the support frame 5 through a waterproof cover 9.

[0045] Preferably, before welding repair, according to the length of the valve 3, the output shaft of the first motor 8 drives the bidirectional lead screw 7 to rotate. Under the action of the threaded connection between the support seat 6 and the bidirectional lead screw 7 and the limiting and guiding action of the first guide rod 10, the support seat 6 drives the placement seat 14 to move and adjust the mutual distance, so as to facilitate placing and clamping the valve 3 in the limit groove 15 on the placement seat 14. Under the action of the clamping in the limit groove 15 and the linear movement of the support seat 6, the limit clamping and fixing of the valve 3 can be completed, which facilitates subsequent airtightness testing and subsequent welding repair processing, providing great convenience for subsequent use.

[0046] Among them, it should be particularly noted that the output shaft of the first motor 8 can drive in both forward and reverse directions.

[0047] Embodiment 2

[0048] As Figures 1 to 13 shown, on the basis of Embodiment 1, this embodiment further includes an automatic sealing mechanism, which is installed on the support seat 6. The automatic sealing mechanism includes a flap 25 for automatically sealing the port of the valve 3. The flap 25 is movably installed on the support seat 6. On the flap 25, there is a docking column 26 for sealing and docking the port of the valve 3. The outside of the docking column 26 is wrapped and connected with an annular airbag 29 for internal sealing of the valve 3. And on the valve 3, there is a sealing valve cover 4 adapted and installed for sealing.

[0049] Furthermore, the automatic sealing mechanism further includes a first conductive block 55 and a second conductive block 56 for placing the valve 3 for conductive triggering and sealing. The first conductive block 55 is fixedly connected to the toothed plate 17 through a guiding connection block 54. The toothed plate 17 is fixedly connected to one end of the placing seat 14. The second conductive block 56 is fixedly connected to the inside of the support seat 6 and is adapted to be docked with the first conductive block 55. A return spring 57 is provided at the connection between one end of the toothed plate 17 and the inside of the support seat 6, and the elastic force of the return spring 57 is much smaller than the gravity of the valve 3.

[0050] Furthermore, the automatic sealing mechanism further includes a second connecting shaft 24 for driving the flap 25 to turn and dock. The flap 25 is rotatably mounted on the support seat 6 through the second connecting shaft 24. A worm gear 23 is fixedly connected to the second connecting shaft 24. A worm 22 is meshed with the worm gear 23. The worm 22 is rotatably mounted inside the support seat 6. The worm 22 is rotationally connected to a first connecting shaft 20 through a synchronous belt 21.

[0051] Furthermore, the automatic sealing mechanism further includes a first gear 18 for driving the first connecting shaft 20 to rotate. A second gear 19 is fixedly connected to the first connecting shaft 20. The second gear 19 is rotatably mounted inside the support seat 6 through the first connecting shaft 20. The second gear 19 is meshed with the first gear 18. The first gear 18 is rotatably mounted inside the support seat 6. The first gear 18 is meshed with the toothed plate 17. The diameter of the first gear 18 is larger than that of the second gear 19, and the second gear 19 and the toothed plate 17 do not contact each other.

[0052] Furthermore, the automatic sealing mechanism further includes a test inlet pipe 27 for injecting gas for detection and an airbag inlet pipe 28 for injecting filling gas into the annular airbag 29. The test inlet pipe 27 is disposed through the docking column 26. Solenoid valves are provided on both the test inlet pipe 27 and the airbag inlet pipe 28. First sealing rings 30 and second sealing rings 31 for sealing connection are provided on the outer side of the annular airbag 29. An avoidance hole 16 for avoiding the annular airbag 29 is provided on the support seat 6.

[0053] Preferably, in this embodiment, the gravity of the set valve 3 is much greater than the elastic force of the return spring 57. Thus, when the valve 3 is placed on the placing seat 14, the placing seat 14 can be driven to drive the toothed plate 17 to press down and move. Thus, the first gear 18 is driven to rotate under the meshing connection between the toothed plate 17 and the first gear 18. Since the first gear 18 is meshed with the second gear 19 and the diameter of the first gear 18 is larger than that of the second gear 19, the number of turns of driving the first connecting shaft 20 to rotate increases.

[0054] The first connecting shaft 20 drives the worm 22 to rotate under the synchronous driving action of the synchronous belt 21. Thus, under the meshing connection between the worm 22 and the worm gear 23, the second connecting shaft 24 is driven to drive the docking column 26 on the flap 25 to move towards the direction close to the port of the valve 3. When the first conductive block 55 on the toothed plate 17 contacts the second conductive block 56 in the support seat 6, at this time, the flap 25 drives the annular airbag 29 on the docking column 26 to be completely clamped in the port of the valve 3, and the flap 25 is in a position completely parallel to the support seat 6. Correspondingly, a sealing valve cover 4 is hermetically installed and connected above the valve 3. And due to the conductive contact connection between the first conductive block 55 and the second conductive block 56, the air pump connected to the outside through the airbag inlet pipe 28 is started for air injection, so that the annular airbag 29 is completely inflated in the port of the valve 3. It realizes the complete sealing treatment of the port of the valve 3 through the provided first sealing ring 30 and the second sealing ring 31. After that, the air pump connected to the outside of the test inlet pipe 27 is used for high-pressure air injection, so that the high-pressure gas is filled in the valve 3, which is convenient for subsequent airtightness detection treatment.

[0055] At this time, the valve 3 that has been clamped and sealed is lifted into the interior of the water tank 2 by means of the support seat 6 and the lifting frame 33. And the water tank 2 is provided with a transparent glass for observation, so that it is convenient to well observe the airtightness and leakage situation of the valve 3 in water, which is convenient for targeted repair welding treatment. There is no need for manual filling and sealing multiple times, reducing the labor force and saving working time, and significantly improving the working efficiency.

[0056] Among them, it should be particularly noted that pulley wheels for synchronous transmission connection with the synchronous belt 21 are provided on both the first connecting shaft 20 and the worm 22.

[0057] Embodiment 3

[0058] As Figures 1 to 8 shown, on the basis of the above embodiment, this embodiment further includes a station switching mechanism, which is installed on the workbench 1 and connected to the support frame 5, and is used for switching the station of the support frame 5, and transferring the station for sealing detection to the welding station. The station switching mechanism includes a turning frame 33 for turning the station. The turning frame 33 is provided with a first contact block 39 and a second contact block 40 for triggering the lifting of the support seat 6.

[0059] Furthermore, the station switching mechanism further includes a telescopic cylinder 13 for lifting the support seat 6. A first connecting plate 11 is fixedly connected to the support seat 6. A second connecting plate 12 is slidably connected in a limited way inside the first connecting plate 11. The telescopic cylinder 13 is fixedly installed inside the second connecting plate 12, and the piston rod of the telescopic cylinder 13 is connected to the inside of the first connecting plate 11. The second connecting plate 12 is rotatably installed at one end of the turning frame 33 through a third connecting shaft 32.

[0060] Further, the station switching mechanism further includes a second motor 36 for rotationally controlling the turning frame 33. The turning frame 33 is rotatably mounted on the workbench 1 through a rotating seat 35. Reinforcing ribs 34 are provided on the turning frame 33. One end of the turning frame 33 is fixedly connected to the output shaft of the second motor 36, and the second motor 36 is fixedly mounted on the rotating seat 35.

[0061] Further, the station switching mechanism further includes a positioning post 44 and a magnet 43 for welding positioning and installation. The positioning post 44 and the magnet 43 are both fixedly connected to one side of the support frame 5. An installation seat 58 is provided on the workbench 1. A positioning groove 45 for adaptively installing and connecting the positioning post 44 is formed in the installation seat 58. A fixing groove 46 for adaptively installing and connecting the magnet 43 is also formed in the installation seat 58. An electromagnet 47 is provided in the fixing groove 46. First support columns 37 and second support columns 42 are also provided on the workbench 1. A first proximity switch 38 adapted to be connected to the first contact block 39 is provided on the first support column 37. A second proximity switch 41 adapted to be connected to the second contact block 40 is provided on the second support column 42.

[0062] Further, the station switching mechanism further includes a welding robot 49 for welding. The welding robot 49 is installed on a moving seat 48. The moving seat 48 is limited and slidably connected to the workbench 1 through a second guide rod 51, and the moving seat 48 is threadedly connected to a driving screw 50. The driving screw 50 is rotatably mounted on the workbench 1. The driving screw 50 is fixedly connected to the output shaft of a third motor 52. The third motor 52 is fixedly mounted on the outside of the workbench 1.

[0063] Preferably, in this embodiment, when the valve 3 lifted by the turning frame 33 is located in the water tank 2, the first contact block 39 on the turning frame 33 is just at the adapted contact position with the first proximity switch 38 on the first support column 37. When the second motor 36 controls the turning frame 33 to switch and turn the station, the first contact block 39 on the turning frame 33 disengages from the position adapted to be docked with the first proximity switch 38. At this time, the telescopic cylinder 13 in the second connecting plate 12 drives the first connecting plate 11 and the avoidance hole 16 to move upward to the highest position, so as to facilitate the subsequent turning of the turning frame 33 controlled by the second motor 36.

[0064] When the second motor 36 controls the turnover frame 33 to turn to the working position at the mounting seat 58, the second contact block 40 on the turnover frame 33 just fits and contacts the second proximity switch 41 on the second support column 42. At this time, the telescopic cylinder 13 drives the valve 3 on the support seat 6 to descend to the lowest position and land on the mounting seat 58. The positioning column 44 on the support frame 5 is connected with the positioning groove 45 in a matching and positioning manner, and at this time, the magnet 43 on the support frame 5 lands at the fixing groove 46 on the mounting seat 58. At this time, the electromagnet 47 is activated to attract and fix with the magnet 43 on the support frame 5, thus ensuring the stability of the placement and installation of the support frame 5. At this time, the sealing valve cover 4 on the valve 3 is disassembled, which is convenient for subsequent repair welding processing.

[0065] And when the second contact block 40 on the turnover frame 33 fits and contacts the second proximity switch 41 on the second support column 42, the output shaft of the third motor 52 drives the driving screw 50 to rotate. Under the action of the threaded connection between the moving seat 48 and the driving screw 50 and the limiting and guiding action of the second guiding rod 51, the moving seat 48 is driven to drive the welding robot 49 to move towards the mounting seat 58, which is convenient for the repair welding processing of the welding robot 49. The repair welding processing can be carried out without manually disassembling the clamping and positioning tooling outside the valve 3 again, greatly improving the welding processing efficiency of the repair welding, being able to complete the repair welding work quickly and accurately, greatly shortening the production cycle, reducing the production cost, and thus improving the economic benefits of the enterprise.

[0066] Among them, it should be particularly noted that the output shafts of the second motor 36 and the third motor 52 can both be driven to rotate forward and backward. And when the turnover frame 33 switches the working position to the mounting seat 58, the water stains and tooling on the valve 3 are all in a completely dried state, which is convenient for the docking of subsequent working positions and the welding processing. At the same time, the proximity opening and closing of the first proximity switch 38 and the second proximity switch 41 and how the welding robot 49 performs welding processing are common knowledge technologies in this field and will not be elaborated too much in this text.

[0067] It should be particularly noted that the components in this application are all general standard components or components well-known to those skilled in the art, and it effectively solves the technical problems proposed in the background technology.

[0068] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for repair welding after precision casting of high-pound valves, comprising a workbench (1), the bottom of the workbench (1) is provided with supporting feet (53) for support, characterized in that: The workbench (1) is provided with a water tank (2) for air tightness detection, the water tank (2) is provided with transparent glass for observation, and further comprises: A positioning clamping mechanism, which is movably mounted on the workbench (1) and is used for positioning and clamping the valve (3), the positioning clamping mechanism comprising a support seat (6) and a placement seat (14) for limiting and clamping the valve (3), the placement seat (14) being slidably connected to the support seat (6), a limiting groove (15) for clamping and limiting is provided at the connection between the placement seat (14) and the support seat (6), and the support seat (6) is movably mounted on the support frame (5); An automatic sealing mechanism is mounted on a support seat (6), the automatic sealing mechanism comprising a flap (25) for automatically sealing a port of a valve (3), the flap (25) being movably mounted on the support seat (6), the flap (25) being provided with a docking post (26) for sealing the port of the docking valve (3), the outer side of the docking post (26) being wrapped and connected with an annular air bag (29) for sealing the inside of the valve (3), and a sealing valve cover (4) for sealing being adapted and mounted on the valve (3), the automatic sealing mechanism also comprising a valve for placing the valve (3) a first conductive block (55) and a second conductive block (56) for conducting a trigger seal, wherein the first conductive block (55) is fixedly connected to a tooth plate (17) via a guide connection block (54), the tooth plate (17) is fixedly connected to one end of a placement seat (14), the second conductive block (56) is fixedly connected to the inside of a support seat (6) and is adapted to be connected to the first conductive block (55), a return spring (57) is provided at a connection between one end of the tooth plate (17) and the inside of the support seat (6), and the elastic force of the return spring (57) is much smaller than the gravity of the valve (3) The automatic sealing mechanism further comprises a second connecting shaft (24) for driving the flap (25) to flip and dock, the flap (25) being rotatably mounted on the support seat (6) via the second connecting shaft (24), the second connecting shaft (24) being fixedly connected to a worm gear (23), the worm gear (23) being meshingly connected to a worm (22), the worm gear (22) being rotatably mounted inside the support seat (6), the worm gear (22) being rotatably connected to the first connecting shaft (20) via a synchronous belt (21), the automatic sealing mechanism further comprises a connecting shaft (24) for driving the first connecting shaft (2 0) a first gear (18) that rotates, a second gear (19) that is fixedly connected to the first connecting shaft (20), and the second gear (19) is rotatably mounted inside the support seat (6) through the first connecting shaft (20), the second gear (19) is meshingly connected to the first gear (18), the first gear (18) is rotatably mounted inside the support seat (6), and the first gear (18) is meshingly connected to the toothed plate (17), the diameter of the first gear (18) is larger than that of the second gear (19), and the second gear (19) and the toothed plate (17) do not contact each other; A workstation switching mechanism is installed on a workbench (1) and connected to a support frame (5), and is used to switch the workstations of the support frame (5) to transfer the workstation for sealing detection to the welding workstation. The workstation switching mechanism includes a flip frame (33) for flipping the workstation, and the flip frame (33) is provided with a first contact block (39) and a second contact block (40) for triggering a lifting support seat (6). The workstation switching mechanism also includes a positioning column (44) and a magnet (43) for welding positioning installation, and the positioning column (44) and the magnet (43) are both fixedly connected to one side of the support frame (5).

2. The equipment for repair welding after precision casting of high-pound valves according to claim 1 is characterized in that: The automatic sealing mechanism further comprises a test air inlet pipe (27) for injecting gas for detection and an air bag air inlet pipe (28) for injecting filling gas into the annular air bag (29); the test air inlet pipe (27) is arranged to penetrate the docking column (26); both the test air inlet pipe (27) and the air bag air inlet pipe (28) are provided with solenoid valves; a first sealing ring (30) and a second sealing ring (31) for sealing connection are provided on the outer side of the annular air bag (29); and a avoiding hole (16) for avoiding the annular air bag (29) is provided on the support seat (6).

3. The equipment for repair welding after precision casting of high-pound valves according to claim 1 is characterized in that: The workstation switching mechanism also includes a telescopic cylinder (13) for lifting the support seat (6); a first connecting plate (11) is fixedly connected to the support seat (6); a second connecting plate (12) is limitedly slidably connected inside the first connecting plate (11); the telescopic cylinder (13) is fixedly installed inside the second connecting plate (12), and a piston rod of the telescopic cylinder (13) is connected to the inside of the first connecting plate (11); the second connecting plate (12) is rotatably installed at one end of the turning frame (33) via a third connecting shaft (32).

4. The equipment for repair welding after precision casting of high-pound valves according to claim 3 is characterized in that: The workstation switching mechanism further comprises a second motor (36) for rotationally controlling a turning frame (33); the turning frame (33) is rotatably mounted on the workbench (1) via a rotating seat (35); a reinforcing rib (34) for reinforcement is provided on the turning frame (33); one end of the turning frame (33) is fixedly connected to an output shaft of the second motor (36), and the second motor (36) is fixedly mounted on the rotating seat (35).

5. The equipment for repair welding after precision casting of high-pound valves according to claim 4 is characterized in that: The workbench (1) is provided with a mounting seat (58), the mounting seat (58) is provided with a positioning groove (45) for fitting and mounting a positioning column (44), the mounting seat (58) is also provided with a fixing groove (46) for fitting and mounting a magnet (43), an electromagnet (47) is arranged in the fixing groove (46), the workbench (1) is also provided with a first supporting column (37) and a second supporting column (42), the first supporting column (37) is provided with a first proximity switch (38) fitting and connecting to the first contact block (39), and the second supporting column (42) is provided with a second proximity switch (41) fitting and connecting to the second contact block (40).

6. The equipment for repair welding after precision casting of high-pound valves according to claim 5 is characterized in that: The workstation switching mechanism also includes a welding robot (49) for welding, wherein the welding robot (49) is mounted on a movable seat (48), wherein the movable seat (48) is slidably connected to the workbench (1) via a second guide rod (51), and the movable seat (48) is threadedly connected to a driving screw (50), wherein the driving screw (50) is rotatably mounted on the workbench (1), and wherein the driving screw (50) is fixedly connected to an output shaft of a third motor (52), and wherein the third motor (52) is fixedly mounted on the outer side of the workbench (1).

7. The equipment for repair welding after precision casting of high-pound valves according to claim 1 is characterized in that: The positioning and clamping mechanism also includes a bidirectional screw rod (7) for driving the support seat (6) to perform movement control, the support seat (6) is connected to the support frame (5) in a limited sliding manner via a first guide rod (10), and the support seat (6) is threadedly connected to the bidirectional screw rod (7), the bidirectional screw rod (7) is rotatably connected to the support frame (5), the bidirectional screw rod (7) is fixedly connected to the output shaft of the first motor (8), and the first motor (8) is fixedly installed on the outer side of the support frame (5) via a waterproof cover (9).

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