Repair welding equipment for high-pound valve after precision casting

Abstract

The invention discloses repair welding equipment for a high-pound-level valve after precision casting, which belongs to the technical field of valve repair welding, and is technically characterized in that the repair welding equipment comprises a workbench, and limiting, clamping and fixing of the valve can be completed through an arranged positioning and clamping mechanism, so that follow-up sealing performance testing and follow-up repair welding processing are facilitated; the automatic sealing mechanism is arranged, so that automatic clamping and sealing treatment of the valve can be realized, the time and errors of manual operation are reduced, the detection speed and accuracy are improved, and the detection efficiency is improved. By means of the station switching mechanism, the valve can be switched from a station for detecting air tightness to a station for repair welding machining, repair welding machining can be conducted without manually disassembling a clamping and positioning tool on the outer side of the valve again, the welding machining efficiency of repair welding machining is greatly improved, the production period is greatly shortened, the production cost is reduced, and the production efficiency is improved. The device has the advantages of being convenient for air tightness test and repair welding processing and high in working efficiency.

Description

Technical Field

[0001] The invention relates to the field of valve repair welding, and in particular to a repair welding device for high-pound valves after precision casting. Background Art

[0002] With the rapid development of modern industry, high-grade valves, as key components in the field of fluid control, are of vital importance in ensuring the safe operation of industrial systems. At the same time, valves are an indispensable part of fluid control systems, and their sealing performance is directly related to the safety and stability of the entire system.

[0003] However, due to the limitations of the casting process and the unevenness of the raw materials, high-pound valves will inevitably have various defects during the precision casting process, such as pores, cracks, shrinkage, etc., which will reduce the sealing performance of the valve and even cause safety hazards such as leakage. In order to ensure the quality and performance of the valve, these defects must be repaired in time. At present, the existing means of detecting the air tightness of the valve are mostly to seal the valve manually, and then manually put the valve into water to detect the air tightness of the valve, and then repair the welding where the bubbles appear on the valve. The air tightness test and repair welding clamping waste a lot of time and labor costs, and the work efficiency is low, which cannot meet the actual use needs.

[0004] Therefore, it is necessary to provide a post-precision casting welding device for high-pound valves to solve the above problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, an embodiment of the present invention aims to provide a post-precision casting welding device for high-pound valves, aiming to solve the technical problems raised in the background technology.

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

[0007] A post-welding device for high-pound valve precision casting comprises a workbench, a support leg is arranged at the bottom of the workbench for support, a water tank for air tightness detection is arranged on the workbench, a transparent glass for observation is arranged on the water tank, and further comprises:

[0008] A positioning clamping mechanism, which is movably mounted on a workbench and is used for positioning and clamping the valve. The positioning clamping mechanism comprises a support seat and a placement seat for limiting and clamping the valve. The placement seat is slidably connected to the support seat. 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 mounted on the support frame.

[0009] An automatic sealing mechanism is installed on the support seat, and the automatic sealing mechanism includes a flap for automatically sealing the port of the valve, the flap is movably installed on the support seat, a docking post for sealing the port of the docking valve is arranged on the flap, an annular airbag for sealing the inside of the valve is wrapped and connected to the outside of the docking post, and a sealing valve cover for sealing is adapted to be installed on the valve;

[0010] A workstation switching mechanism is installed on a workbench and connected to a support frame, and is used to switch the workstations of the support frame, transferring a workstation for sealing detection to a welding workstation. The workstation switching mechanism includes a flipping frame for flipping the workstation, and the flipping frame is provided with a first contact block and a second contact block for triggering a lifting support seat.

[0011] As a further solution of the present invention, the automatic sealing mechanism also includes a first conductive block and a second conductive block for placing the valve for conductive triggered sealing, the first conductive block is fixedly connected to the tooth plate through a guide connecting block, the tooth plate is fixedly connected to one end of the placement seat, the second conductive block is fixedly connected to the inside of the support seat and is adapted to be connected with the first conductive block, and a reset spring is provided at the connection between one end of the tooth plate and the inside of the support seat, and the elastic force of the reset spring is much smaller than the gravity of the valve.

[0012] As a further solution of the present invention, the automatic sealing mechanism also includes a second connecting shaft for driving the flap to flip and dock, the flap is rotatably mounted on the support seat via the second connecting shaft, the second connecting shaft is fixedly connected to a worm gear, the worm gear is meshingly connected to a worm, the worm gear is rotatably mounted inside the support seat, and the worm gear is rotatably connected to the first connecting shaft via a synchronous belt.

[0013] As a further solution of the present invention, the automatic sealing mechanism also includes a first gear for driving the first connecting shaft to rotate, a second gear is fixedly connected to the first connecting shaft, and the second gear is rotatably installed inside the support seat through the first connecting shaft, the second gear is meshingly connected to the first gear, the first gear is rotatably installed inside the support seat, and the first gear is meshingly connected to the tooth plate, the diameter of the first gear is larger than that of the second gear, and the second gear and the tooth plate do not contact each other.

[0014] As a further solution of the present invention, the automatic sealing mechanism also includes a test air inlet pipe for injecting gas detection and an airbag air inlet pipe for injecting filling gas into the annular airbag, the test air inlet pipe is arranged on the docking column, and both the test air inlet pipe and the airbag air inlet pipe are provided with solenoid valves. A first sealing ring and a second sealing ring for sealing connection are provided on the outer side of the annular airbag, and a avoidance hole for avoiding the annular airbag is opened on the support seat.

[0015] As a further solution of the present invention, the workstation switching mechanism also includes a telescopic cylinder for lifting a support seat, a first connecting plate is fixedly connected to the support seat, a second connecting plate is slidingly connected to the first connecting plate in a limited position, 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, and the second connecting plate is rotatably installed at one end of the flip frame through a third connecting shaft.

[0016] As a further solution of the present invention, the workstation switching mechanism also includes a second motor for rotationally controlling the flip frame, the flip frame is rotatably installed on the workbench through a rotating seat, the flip frame is provided with reinforcing ribs for reinforcement, one end of the flip 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 workstation switching mechanism also includes a positioning column and a magnet for welding positioning installation, the positioning column and the magnet are fixedly connected to one side of the support frame, a mounting seat is provided on the workbench, a positioning groove for adapting the installation and connection of the positioning column is opened on the mounting seat, a fixing groove for adapting the installation and connection of the magnet is also opened on the mounting seat, an electromagnet is arranged in the fixing groove, a first support column and a second support column are also arranged on the workbench, the first support column is provided with a first proximity switch adapted to be connected to the first contact block, and the second support column is provided with a second proximity switch adapted to be connected to the second contact block.

[0018] As a further solution of the present invention, the workstation switching mechanism also includes a welding robot for welding, which is arranged and installed on a moving seat, and the moving seat is slidingly connected to the workbench through a second guide rod, and the moving seat is threadedly connected to a driving screw, and the driving screw is rotatably installed on the workbench, and the driving screw is fixedly connected to the output shaft of a third motor, and the third motor is fixedly installed on the outside of the workbench.

[0019] As a further solution of the present invention, the positioning and clamping mechanism also includes a bidirectional screw rod for driving the support seat for movement control, the support seat is slidingly connected to the support frame through a first guide rod, and the support seat is threadedly connected to the bidirectional screw rod, the bidirectional screw rod is rotatably connected to the support frame, the bidirectional screw rod is fixedly connected to the output shaft of the first motor, and the first motor is fixedly installed on the outside of the support frame through a waterproof cover.

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

[0021] The present invention can complete the limit clamping and fixing of the valve by means of the positioning clamping mechanism, thereby facilitating subsequent sealing test and subsequent repair welding processing, and providing great convenience for subsequent use.

[0022] The automatic sealing mechanism can realize automatic clamping and sealing of the valve, which makes it easy to observe the air tightness and leakage of the valve in water, and can carry out targeted repair welding without the need for manual filling and sealing multiple times, thus reducing labor, reducing the time and error of manual operation, and improving the detection speed and accuracy, thereby improving the overall production efficiency.

[0023] The station switching mechanism can be used to switch the valve from the air tightness detection station to the repair welding station. The repair welding process can be carried out without manually removing the clamping and positioning tooling on the outside of the valve. This greatly improves the welding efficiency of the repair welding process, and can complete the repair welding work quickly and accurately, greatly shortening the production cycle, reducing production costs, and thus improving the economic benefits of the enterprise.

[0024] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of A.

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

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

[0029] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of B.

[0030] Figure 6 It is a schematic diagram of the exploded structure of the side connection of the support frame in the embodiment of the invention.

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

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

[0033] Fig. 9It is a schematic diagram of the connection structure of the placement seat in the embodiment of the invention.

[0034] Fig.10 It is a schematic diagram of the connection structure inside the support base in an embodiment of the invention.

[0035] Fig.11 for Fig.10 Schematic diagram of the enlarged structure of C in the figure.

[0036] Fig.12 It is a schematic diagram of the side view structure of the internal connection of the support base in an embodiment of the invention.

[0037] Fig.13 for Fig.12 Schematic diagram of the enlarged structure of D in the figure.

[0038] Figure numerals: 1, workbench; 2, water tank; 3, valve; 4, sealing valve cover; 5, support frame; 6, support seat; 7, bidirectional screw rod; 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, limit groove; 16, avoidance hole; 17, tooth plate; 18, first gear; 19, second gear; 20, first connecting shaft; 21, synchronous belt; 22, worm; 23, worm wheel; 24, second connecting shaft; 25, flap; 26, docking column; 27, test air intake pipe; 28, air bag air intake pipe; 29, annular air bag; 30, first sealing ring; 31 , second sealing ring; 32, third connecting shaft; 33, turning frame; 34, reinforcing ribs; 35, rotating seat; 36, second motor; 37, first supporting column; 38, first proximity switch; 39, first contact block; 40, second contact block; 41, second proximity switch; 42, second supporting 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, supporting foot; 54, guide connecting block; 55, first conductive block; 56, second conductive block; 57, reset spring; 58, mounting seat. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 intended to limit the present invention.

[0040] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0041] Example 1

[0042] See also Figures 1 to 9A post-welding device for high-pound valve precision casting includes a workbench 1, a support leg 53 is provided at the bottom of the workbench 1 for support, a water tank 2 for air tightness detection is provided on the workbench 1, and a transparent glass for observation is provided on the water tank 2, and also includes:

[0043] The positioning and clamping mechanism is movably mounted on the workbench 1 and is used for positioning and clamping 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 position. A limiting groove 15 for clamping and limiting is provided at the connection between the placement seat 14 and the support seat 6. The support seat 6 is movably mounted on the support frame 5.

[0044] Furthermore, the positioning and clamping mechanism also includes a bidirectional screw rod 7 for driving the support seat 6 for movement control. The support seat 6 is connected to the support frame 5 by a limited sliding connection through 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 outside of the support frame 5 through a waterproof cover 9.

[0045] Preferably, before the repair welding, according to the length of the valve 3, the output shaft of the first motor 8 drives the bidirectional screw 7 to rotate, and under the threaded connection between the support seat 6 and the bidirectional screw 7 and the limiting and guiding action of the first guide rod 10, the support seat 6 drives the placement seat 14 to adjust the distance between each other, so as to facilitate the placement of the valve 3 in the limiting groove 15 on the placement seat 14. The limiting clamping and fixing of the valve 3 can be completed under the action of the clamping of the limiting groove 15 and the linear movement of the support seat 6, so as to facilitate the subsequent sealing test and the subsequent repair welding processing, which provides great convenience for subsequent use.

[0046] It should be particularly noted that the output shaft of the first motor 8 can be driven in forward and reverse directions.

[0047] Example 2

[0048] like Figures 1 to 13 As shown, based on Example 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. The flap 25 is provided with a docking column 26 for sealing the port of the docking valve 3. The outer side of the docking column 26 is wrapped and connected with an annular airbag 29 for internal sealing of the valve 3, and the valve 3 is adapted to be installed and connected with a sealing valve cover 4 for sealing.

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

[0050] Furthermore, the automatic sealing mechanism also includes a second connecting shaft 24 for driving the flap 25 to flip and dock. The flap 25 is rotatably mounted on the support seat 6 via the second connecting shaft 24. The second connecting shaft 24 is fixedly connected to a worm gear 23. The worm gear 23 is meshingly connected to a worm 22. The worm gear 22 is rotatably mounted inside the support seat 6. The worm gear 22 is rotatably connected to the first connecting shaft 20 via a synchronous belt 21.

[0051] Furthermore, the automatic sealing mechanism also 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, and the second gear 19 is rotatably installed 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 installed inside the support seat 6, and the first gear 18 is meshingly connected to the tooth plate 17, the diameter of the first gear 18 is larger than the second gear 19, and the second gear 19 and the tooth plate 17 do not contact each other.

[0052] Furthermore, the automatic sealing mechanism also includes a test air inlet pipe 27 for injecting gas 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 on the docking column 26. Both the test air inlet pipe 27 and the air bag air inlet pipe 28 are provided with solenoid valves. The outer side of the annular air bag 29 is provided with a first sealing ring 30 and a second sealing ring 31 for sealing connection. The support seat 6 is provided with a avoidance hole 16 for avoiding the annular air bag 29.

[0053] Preferably, in this embodiment, the gravity of the valve 3 is much greater than the elastic force of the reset spring 57, so that when the valve 3 is placed on the placement seat 14, the placement seat 14 can be driven to drive the toothed plate 17 to move downward, thereby driving the first gear 18 to rotate under the relationship of meshing connection between the toothed plate 17 and the first gear 18. Since the first gear 18 is meshingly connected with the second gear 19 and the diameter of the first gear 18 is greater than that of the second gear 19, the number of turns of the first connecting shaft 20 is increased.

[0054] The first connecting shaft 20 drives the worm 22 to rotate under the synchronous driving action of the synchronous belt 21, so that the second connecting shaft 24 drives the docking column 26 on the flap 25 to move toward the direction close to the port of the valve 3 under the relationship of meshing connection between the worm 22 and the worm wheel 23. When the first conductive block 55 on the tooth plate 17 contacts the second conductive block 56 in the support seat 6, the flap 25 drives the annular airbag 29 on the docking column 26 to be completely engaged in the port of the valve 3, and the flap 25 is in a position completely parallel to the support seat 6, and the corresponding valve 3 A sealing valve cover 4 is sealingly installed 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 bag air inlet pipe 28 is connected to an external air pump to start air injection, so that the annular air bag 29 is completely expanded in the port of the valve 3, and the first sealing ring 30 and the second sealing ring 31 are set to achieve complete sealing of the port of the valve 3. Thereafter, the air pump connected to the outside of the test air inlet pipe 27 is used for high-pressure air injection, so that the high-pressure gas is filled in the interior of the valve 3, which is convenient for subsequent air tightness detection processing.

[0055] At this time, the clamped and sealed valve 3 is located inside the water tank 2 by being lifted by the support seat 6 and the flip frame 33, and a transparent glass for observation is provided on the water tank 2, so that the air tightness and leakage of the valve 3 in the water can be well observed, and targeted repair welding is convenient. There is no need for manual filling and sealing multiple times, which reduces labor, saves working time, and significantly improves work efficiency.

[0056] It should be particularly noted that both the first connecting shaft 20 and the worm 22 are provided with pulleys connected to the synchronous belt 21 for synchronous transmission.

[0057] Example 3

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

[0059] Furthermore, 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 slidingly connected to 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, and the second connecting plate 12 is rotatably installed at one end of the flip frame 33 through the third connecting shaft 32.

[0060] Furthermore, the workstation switching mechanism also includes a second motor 36 for rotationally controlling the flip frame 33. The flip frame 33 is rotatably mounted on the workbench 1 through a rotating seat 35. A reinforcing rib 34 for reinforcement is provided on the flip frame 33. One end of the flip 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] Furthermore, the workstation switching mechanism also includes a positioning column 44 and a magnet 43 for welding positioning installation. The positioning column 44 and the magnet 43 are fixedly connected to one side of the support frame 5. A mounting seat 58 is provided on the workbench 1. The mounting seat 58 is provided with a positioning groove 45 for adapting and installing the positioning column 44. The mounting seat 58 is also provided with a fixing groove 46 for adapting and installing the magnet 43. An electromagnet 47 is provided in the fixing groove 46. A first support column 37 and a second support column 42 are also provided on the workbench 1. The first support column 37 is provided with a first proximity switch 38 adapted to be connected to the first contact block 39, and the second support column 42 is provided with a second proximity switch 41 adapted to be connected to the second contact block 40.

[0062] Furthermore, the workstation switching mechanism also includes a welding robot 49 for welding, which is arranged and installed on a moving seat 48. The moving seat 48 is connected to the workbench 1 by a second guide rod 51 for limited sliding, and the moving seat 48 is threadedly connected to the driving screw 50. The driving screw 50 is rotatably installed on the workbench 1. The driving screw 50 is fixedly connected to the output shaft of the third motor 52, and the third motor 52 is fixedly installed on the outside of the workbench 1.

[0063] Preferably, in the present embodiment, when the valve 3 lifted by the flip frame 33 is located in the water tank 2, the first contact block 39 on the flip frame 33 is just in an adaptive contact position with the first proximity switch 38 on the first support column 37. When the second motor 36 controls the flip frame 33 to switch and flip the workstation, the first contact block 39 on the flip frame 33 is disengaged from the adaptive matching position 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 up to the highest point, thereby facilitating the subsequent second motor 36 to control the flipping of the flip frame 33.

[0064] When the second motor 36 controls the flip frame 33 to flip to the working position at the mounting seat 58, the second contact block 40 on the flip frame 33 just fits and contacts with 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 drop to the lowest point and fall on the mounting seat 58. The positioning column 44 on the support frame 5 is fitted and positioned with the positioning groove 45, and the magnet 43 on the support frame 5 falls on the fixing groove 46 on the mounting seat 58. At this time, the electromagnet 47 starts to attract and fix the magnet 43 on the support frame 5, thereby 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 can be removed to facilitate subsequent repair welding processing.

[0065] When the second contact block 40 on the flip frame 33 is in matching contact with 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, and under the threaded connection between the moving seat 48 and the driving screw 50 and the limiting guiding action of the second guide rod 51, the moving seat 48 drives the welding robot 49 to move towards the mounting seat 58, thereby facilitating the repair welding processing of the welding robot 49, and the repair welding processing can be carried out without manually disassembling the clamping and positioning tooling on the outside of the valve 3 again, which greatly improves the welding processing efficiency of the repair welding processing, can quickly and accurately complete the repair welding work, greatly shortens the production cycle, reduces production costs, and thus improves 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 be driven forward and reversely, and when the turning frame 33 switches the workstation to the mounting seat 58, the water stains and tooling on the valve 3 are in a completely dried state, thereby facilitating the docking and welding processing of subsequent workstations. 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 and techniques known to those skilled in the art, and will not be elaborated in this article.

[0067] It should be particularly noted that the components in this application are all universal standard parts or components well known to those skilled in the art, which effectively solve the technical problems raised in the background technology.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should 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 a workbench (1) and is used for positioning and clamping a 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 a support frame (5); An automatic sealing mechanism, which 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 sealingly docking the port of the 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); 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 a workstation for sealing detection to a 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).

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 first conductive block (55) and a second conductive block (56) for placing the valve (3) for conductive trigger sealing, wherein the first conductive block (55) is fixedly connected to the tooth plate (17) via a guide connection block (54), and the tooth plate (17) is fixedly connected to one end of the placement seat (14), and the second conductive block (56) is fixedly connected to the inside of the support seat (6) and is adapted to be connected with the first conductive block (55). A reset spring (57) is provided at the connection between one end of the tooth plate (17) and the inside of the support seat (6), and the elastic force of the reset spring (57) is much smaller than the gravity of the valve (3).

3. The equipment for repair welding after precision casting of high-pound valves according to claim 2 is characterized in that: The automatic sealing mechanism also includes a second connecting shaft (24) for driving the flap (25) to flip and dock, the flap (25) is rotatably mounted on the support seat (6) via the second connecting shaft (24), the second connecting shaft (24) is fixedly connected to a worm gear (23), the worm gear (23) is meshingly connected to a worm (22), the worm gear (22) is rotatably mounted inside the support seat (6), and the worm gear (22) is rotatably connected to the first connecting shaft (20) via a synchronous belt (21).

4. The equipment for repair welding after precision casting of high-pound valves according to claim 3 is characterized in that: The automatic sealing mechanism also includes a first gear (18) for driving the first connecting shaft (20) to rotate, the first connecting shaft (20) is fixedly connected with a second gear (19), 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.

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

6. 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 flip frame (33) via a third connecting shaft (32).

7. The equipment for welding after precision casting of high-pound valves according to claim 6 is characterized in that: The workstation switching mechanism also includes a second motor (36) for rotating and controlling a flip frame (33); the flip frame (33) is rotatably mounted on the workbench (1) via a rotating seat (35); a reinforcing rib (34) for reinforcement is provided on the flip frame (33); one end of the flip 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).

8. The equipment for welding after precision casting of high-pound valves according to claim 7 is characterized in that: The workstation switching mechanism also includes a positioning column (44) and a magnet (43) for welding positioning installation, the positioning column (44) and the magnet (43) are both fixedly connected to one side of the support frame (5), the workbench (1) is provided with a mounting seat (58), the mounting seat (58) is provided with a positioning groove (45) for fitting and installing the positioning column (44), the mounting seat (58) is also provided with a fixing groove (46) for fitting and installing the 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) that is fitted and connected to the first contact block (39), and the second supporting column (42) is provided with a second proximity switch (41) that is fitted and connected to the second contact block (40).

9. The equipment for repair welding after precision casting of high-pound valves according to claim 8 is characterized in that: The workstation switching mechanism also includes a welding robot (49) for welding, wherein the welding robot (49) is arranged and 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).

10. 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 through 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) through a waterproof cover (9).

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