A fixture and method for milling the end face of a gate valve.

Abstract

This invention relates to the field of milling fixtures, and particularly to a fixture and method for milling the end face of a gate valve. It includes a milling base, a fixing component mounted at the top center of the milling base, and a milling component mounted at the top edge of the milling base. The invention uses a seventh electric push rod to move a sliding rectangular block downwards, compressing a tension spring. During this movement, the milling port of the gate valve rises, and the tension spring provides a rebound force for subsequent pressure relief and reset. This allows the gate valve port to self-adjust during milling, improving both the clamping effect and flexibility of the fixture body. It also enhances stability during rotation without damaging the structure, extending the lifespan of the device and improving both the milling effect and the overall working efficiency of the fixture.

Description

Technical Field

[0001] This invention belongs to the field of milling fixture technology, and specifically relates to a fixture and method for milling the end face of a gate valve. Background Technology

[0002] A gate valve, also known as a stop valve, is a type of forced sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force a leak-proof seal.

[0003] A search revealed that in the prior art, Chinese Patent Publication No. CN105364594B, authorized and published on February 16, 2018, discloses a fixture for milling the end face of a gate valve. The fixture includes a base plate with a fixed frame and positioning holes. A support frame is slidably mounted on the base plate with an annular hole. A large gear ring is mounted at the front end of the annular hole, and an extension plate is welded to the large gear ring. The above embodiment automatically controls multiple arc-shaped pressure plates to automatically shift and clamp the valve body.

[0004] However, the device still has the following drawbacks: While the clamping mechanism effectively limits the position of the gate valve, it also prevents the valve from being adjusted at an angle while maintaining stable clamping. Furthermore, it restricts the angle adjustment to a milling structure, which limits the machining process between the milling structure and the gate valve, thereby reducing the effectiveness of the clamping mechanism. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a fixture for milling the end face of a gate valve. It includes a milling base, a fixing component mounted at the top center of the milling base, a milling component mounted at the top edge of the milling base, and a fixture component mounted at the top end of the milling base away from the milling component. The clamping assembly includes two sets of second connecting plates. Each set of second connecting plates has a set of mounting blocks installed on its bottom inner wall. Each set of mounting blocks has a set of connecting rods installed on its top. Each set of mounting blocks has one end of a tension spring installed on its top. Each set of tension springs has a set of sliding rectangular blocks installed on its other end. Each set of second connecting plates has a set of seventh electric push rods installed on its top inner wall. During the movement, the milling port of the shut-off valve is raised, and the stretching spring provides a rebound force for subsequent discharge and reset.

[0006] Furthermore, the fixing assembly includes a first fixing plate, the bottom of which is mounted on the top of the milling base. A first electric push rod is mounted on the top of the first fixing plate, and a second fixing plate is mounted on the output end of the first electric push rod. Two sets of first fixing blocks are symmetrically mounted on the top edge of the second fixing plate, and a set of rotating rods is mounted on the corresponding side wall of each of the two sets of first fixing blocks.

[0007] Furthermore, each set of rotating rods is rotatably connected to a set of second fixing blocks, and a third fixing plate is connected between the bottoms of the two sets of second fixing blocks. The top of the third fixing plate is provided with a sliding groove, and two sets of sliding plates are slidably connected in the sliding groove. One end of a compression spring is installed on one side wall of each set of sliding plates, and the other end of each set of compression springs is installed on one of the sets of second fixing blocks.

[0008] Furthermore, the milling assembly includes a support plate, the bottom of which is mounted on the top edge of the milling base. An electric slide is mounted on one side wall of the support plate, and a second electric push rod is drivenly connected to the output end of the electric slide. A first mounting plate is mounted on the output end of the second electric push rod, and a second mounting plate is mounted on the bottom of the first mounting plate.

[0009] Furthermore, a third electric push rod is installed on one side wall of the second mounting plate, a first motor is installed on the output end of the third electric push rod, a transmission column is connected to the output end of the first motor, a sleeve ring is sleeved on the outer wall of the transmission column, a third mounting plate is installed on the outer wall of the sleeve ring, and a milling structure is installed on the bottom of the third mounting plate.

[0010] Furthermore, the fixture assembly also includes a first connecting block, the bottom of which is mounted on the top edge of the milling base. A fifth electric push rod is mounted on the top of the first connecting block. A second connecting block is mounted on the output end of the fifth electric push rod. A sixth electric push rod is mounted on one side wall of the second connecting block. A first connecting plate is mounted on the output end of the sixth electric push rod. One end of each set of second connecting plates is mounted on the edge of one side wall of the first connecting plate.

[0011] Furthermore, a set of sliding cavities is provided on the corresponding side wall of each of the two sets of second connecting plates. Each set of tension springs is sleeved on the connecting rod, each set of sliding rectangular blocks is sleeved on the connecting rod, the outer wall of each set of sliding rectangular blocks is slidably connected in the sliding cavity, and a set of pressure-relieving blocks is installed on the top of each set of sliding rectangular blocks.

[0012] Furthermore, a set of rotating tubes is rotatably connected to one side wall of each set of sliding rectangular blocks, and a third connecting plate is connected between the two sets of rotating tubes. An eighth electric push rod is installed on one side wall of the third connecting plate, and a fixed plate is installed on the output end of the eighth electric push rod. An air bag structure is sleeved on the outer wall of the fixed plate, and an air pump is installed on the outer wall of the fixed plate.

[0013] Furthermore, two sets of fifth connecting plates are symmetrically arranged at one end of the third connecting plate near the eighth electric push rod. Two sets of slides are symmetrically opened on one side wall of each set of fifth connecting plates. A set of third connecting blocks is slidably connected in each set of slides, and an elastic plastic plate is connected between the two sets of third connecting blocks.

[0014] A method for using a milling fixture for machining the end face of a gate valve, the method comprising: The fixing assembly is activated to limit and clamp the middle of the shut-off valve. The clamping assembly is activated to bend and clamp the two ends of the gate valve that are not being processed, and to limit the movement of the inner wall of the gate valve. Start the milling assembly to mill the end face of the shut-off valve; The seventh electric actuator is activated to push the sliding rectangular block downwards, compressing and stretching the spring. During the movement, one end of the clamped shut-off valve moves downwards.

[0015] The beneficial effects of this invention are: 1. Activating the seventh electric push rod pushes the sliding rectangular block downwards to compress and stretch the spring. During the movement, the milling port of the shut-off valve rises, and the stretch spring provides a rebound force for subsequent force release and reset. This allows the shut-off valve port to adjust itself during milling, improving the clamping effect and flexibility of the fixture body. It also enhances stability during rotation without damaging the structure, extending the service life of the device and improving both the milling effect and the working efficiency of the fixture.

[0016] 2. The second electric push rod is activated to lower the milling structure for milling the end face. To improve the flexibility of milling range and angle adjustment, the first motor is activated to adjust the angle of the output end of the milling structure. Then, during the milling process, the third electric push rod can be used to push the milling structure to move in parallel. When the milling work is in horizontal operation, the fourth electric push rod can be activated to move the protective ring to the milling point. This provides protection while collecting milling debris, thus improving the milling range and cleaning effect of the device.

[0017] 3. The two sets of elastic molding plates are positioned at the two ends of the unprocessed port of the shut-off valve. Then, the ninth electric push rod is activated to push the elastic molding plates towards the port. When they contact the port, the two sets of third connecting blocks are activated to squeeze the elastic molding plates. The elastic molding plates then limit the shut-off valve port. Furthermore, when facing shut-off valves with different ports, the second motor can drive the elastic molding plates to rotate and adjust their position, improving the compatibility of bending and limiting.

[0018] 4. Push the two sets of sliding plates to compress the spring, then place the shut-off valve on the third fixed plate. Then stop pushing the two sets of sliding plates. When the compression spring senses the pressure disappearing, it begins to rebound, causing the two sets of sliding plates to limit and clamp the shut-off valve, thus speeding up the clamping process. Then start the air pump to fill the air bag structure with gas, so that the air bag structure expands and limits and stabilizes the inner wall of the shut-off valve, improving the internal stability effect and expanding the limiting range of the device. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a machining milling fixture structure according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of the fixed component structure according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of a milling assembly structure according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of a milling structure according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of a clamp assembly structure according to an embodiment of the present invention is shown; Figure 6 A schematic diagram of the second connecting plate structure according to an embodiment of the present invention is shown; Figure 7 A cross-sectional schematic diagram of the second connecting plate according to an embodiment of the present invention is shown; Figure 8 A schematic diagram of an elastic molding plate structure according to an embodiment of the present invention is shown.

[0021] In the diagram: 1. Milling base; 2. Fixing assembly; 201. First fixing plate; 202. First electric push rod; 203. Second fixing plate; 204. First fixing block; 205. Rotating rod; 206. Second fixing block; 207. Third fixing plate; 208. Slide groove; 209. Sliding plate; 210. Compression spring; 3. Milling assembly; 301. Support plate; 302. Electric slide table; 303. Second electric push rod; 304. First mounting plate; 305. Second mounting plate; 306. Third electric push rod; 307. First motor; 308. Transmission column; 309. Collar ring; 310. Third mounting plate; 311. Milling structure; 312. Fourth electric push rod; 313. Protective ring; 4. Fixture assembly; 40 1. First connecting block; 402. Fifth electric push rod; 403. Second connecting block; 404. Sixth electric push rod; 405. First connecting plate; 406. Second connecting plate; 407. Slide cavity; 408. Mounting block; 409. Connecting rod; 410. Stop block; 411. Tension spring; 412. Sliding rectangular block; 413. Rotating tube; 414. Pressure relief block; 415. Seventh electric push rod; 416. Third connecting plate; 417. Eighth electric push rod; 418. Fixed plate; 419. Inflatable bag structure; 420. Air pump; 421. Fourth connecting plate; 422. Ninth electric push rod; 423. Second motor; 424. Fifth connecting plate; 425. Slide rail; 426. Third connecting block; 427. Elastic molding plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] This invention provides a milling fixture for machining the end face of a gate valve. It includes a milling base 1, exemplarily, such as... Figure 1 As shown, a fixing component 2 is installed at the top center of the milling base 1, a milling component 3 is installed at the top edge of the milling base 1, and a clamping component 4 is installed at the top end of the milling base 1 away from the milling component 3.

[0024] For example, such as Figure 2As shown, the fixing assembly 2 includes a first fixing plate 201. The bottom of the first fixing plate 201 is mounted on the top of the milling base 1. A first electric push rod 202 is mounted on the top of the first fixing plate 201. A second fixing plate 203 is mounted on the output end of the first electric push rod 202. Two sets of first fixing blocks 204 are symmetrically mounted on the top edge of the second fixing plate 203. A set of rotating rods 205 is mounted on one side wall of each set of first fixing blocks 204. A set of second fixing blocks 206 is rotatably connected to each set of rotating rods 205. A third fixing plate 207 is connected between the bottoms of the two sets of second fixing blocks 206. A sliding groove 208 is opened on the top of the third fixing plate 207. Two sets of sliding plates 209 are slidably connected in the sliding groove 208. One end of a compression spring 210 is mounted on one side wall of each set of sliding plates 209. The other end of each set of compression springs 210 is mounted on one of the sets of second fixing blocks 206.

[0025] When the end face of the shut-off valve is being milled, the two sets of sliding plates 209 are first pushed to move closer to the second fixed block 206 in the slide groove 208, thereby compressing the compression spring 210. Then the shut-off valve is placed on the third fixed plate 207, and the pushing of the two sets of sliding plates 209 is stopped. When the compression spring 210 senses the pressure disappearing, it begins to rebound, so that the two sets of sliding plates 209 limit and clamp the shut-off valve, so that the end face to be milled faces the end of the milling assembly 3, thus speeding up the clamping process.

[0026] For example, such as Figure 3 and Figure 4 As shown, the milling assembly 3 includes a support plate 301, the bottom of which is mounted on the top edge of the milling base 1. An electric slide 302 is mounted on one side wall of the support plate 301. A second electric push rod 303 is connected to the output end of the electric slide 302. A first mounting plate 304 is mounted on the output end of the second electric push rod 303. A second mounting plate 305 is mounted on the bottom of the first mounting plate 304. A third electric push rod 305 is mounted on one side wall of the second mounting plate 305. 6. A first motor 307 is installed on the output end of the third electric push rod 306. A transmission column 308 is connected to the output end of the first motor 307. A sleeve ring 309 is sleeved on the outer wall of the transmission column 308. A third mounting plate 310 is installed on the outer wall of the sleeve ring 309. A milling structure 311 is installed on the bottom of the third mounting plate 310. A fourth electric push rod 312 is installed on the bottom of the third mounting plate 310. A protective ring 313 is installed on the output end of the fourth electric push rod 312.

[0027] The milling operation begins. The electric slide 302 moves the milling structure 311 to the designated position. Then, the second electric push rod 303 is activated to push the milling structure 311 down to mill the end face. To improve the flexibility of the milling range and angle adjustment, the first motor 307 is activated to drive the transmission column 308 to rotate. While the transmission column 308 rotates, it also drives the third mounting plate 310 to rotate. As the third mounting plate 310 rotates, it also drives the output end of the milling structure 311 to adjust its angle. During the milling process, the third electric push rod 306 can be used to push the milling structure 311 to move in parallel. When the milling operation is horizontal, the fourth electric push rod 312 can be activated to move the protective ring 313 to the milling point. This provides protection and collects milling debris, improving both the milling range and the cleaning effect of the device.

[0028] For example, such as Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the clamping assembly 4 includes a first connecting block 401. The bottom of the first connecting block 401 is mounted on the top edge of the milling base 1. A fifth electric push rod 402 is mounted on the top of the first connecting block 401. A second connecting block 403 is mounted on the output end of the fifth electric push rod 402. A sixth electric push rod 404 is mounted on one side wall of the second connecting block 403. A first connecting plate 405 is mounted on the output end of the sixth electric push rod 404. Two sets of second connecting plates 406 are symmetrically mounted on the edge of one side wall of the first connecting plate 405. A set of sliding cavities 407 is formed on the corresponding side wall of each set of second connecting plates 406. A set of mounting blocks 408 is installed on the bottom inner wall of the second connecting plate 406. A set of connecting rods 409 is installed on the top of each set of mounting blocks 408. A set of stop blocks 410 is installed on the top of each set of connecting rods 409. One end of a set of tension springs 411 is installed on the top of each set of mounting blocks 408. Each set of tension springs 411 is sleeved on the connecting rods 409. A set of sliding rectangular blocks 412 is installed on the other end of each set of tension springs 411. Each set of sliding rectangular blocks 412 is sleeved on the connecting rods 409. The outer wall of each set of sliding rectangular blocks 412 is slidably connected to the sliding cavity 407. The top of each set of sliding rectangular blocks 412... Each set of pressure-reducing blocks 414 is installed. A set of seventh electric push rods 415 is installed on the top inner wall of each set of second connecting plates 406. A set of rotating tubes 413 is rotatably connected to one side wall of each set of sliding rectangular blocks 412. A third connecting plate 416 connects the two sets of rotating tubes 413. An eighth electric push rod 417 is installed on one side wall of the third connecting plate 416. A fixed plate 418 is installed on the output end of the eighth electric push rod 417. An inflatable bag structure 419 is sleeved on the outer wall of the fixed plate 418. An air pump 420 is installed on the outer wall of the fixed plate 418. The output end of the air pump 420 is connected to the input end of the inflatable bag structure 419. Two sets of fourth connecting plates 421 are symmetrically installed on the side wall of the third connecting plate 416 near the eighth electric push rod 417. A set of ninth electric push rods 422 is installed on the corresponding side wall of each set of fourth connecting plates 421. A set of second motors 423 is installed on the output end of each set of ninth electric push rods 422. A set of fifth connecting plates 424 is installed on the output end of each set of second motors 423. Two sets of slide rails 425 are symmetrically opened on the side wall of each set of fifth connecting plates 424 away from the second motors 423. A set of third connecting blocks 426 is slidably connected in each set of slide rails 425. An elastic plastic plate 427 is connected between the two sets of third connecting blocks 426.

[0029] The fifth electric push rod 402 is activated to raise the second connecting block 403 to a position flush with the shut-off valve. Then, the sixth electric push rod 404 is activated to push the third connecting plate 416 towards the shut-off valve, so that the two sets of elastic molding plates 427 are located at both ends of the unprocessed port of the shut-off valve. Then, the ninth electric push rod 422 is activated to push the elastic molding plates 427 towards the port. When they contact the port, the two sets of third connecting blocks 426 begin to squeeze the elastic molding plates 427. During the squeezing process, the two sets of third connecting blocks 426 slide within the slide rail 425, which improves the adjustment flexibility of the third connecting blocks 426. Furthermore, when facing shut-off valves with different ports, the second motor 423 can drive the elastic molding plates 427 to rotate and adjust their position, improving the compatibility of bending and limiting.

[0030] When limiting the stop valve port, the eighth electric push rod 417 is activated to push the fixed plate 418 to extend into the stop valve. Then, the air pump 420 is activated to fill the air bag structure 419 with gas, so that the air bag structure 419 expands and limits and stabilizes the inner wall of the stop valve, which improves the internal stability effect and expands the limiting range of the device.

[0031] When the angle of the shut-off valve needs to be adjusted for better milling results, the seventh electric push rod 415 is activated to push the sliding rectangular block 412 downward to compress the tension spring 411. During its movement, the third connecting plate 416 descends. As the third connecting plate 416 descends, it also causes the rotating tube 413 to rotate within the sliding rectangular block 412, improving rotational flexibility. Simultaneously, it causes one end of the shut-off valve to move downward, and as the shut-off valve is pressed down, it also causes the two sets of second fixed blocks 206 to rotate on the outer wall of the rotating rod 205, thereby causing the middle end of the shut-off valve to rotate. This allows the shut-off valve port to adjust itself during milling, improving the clamping effect and flexibility of the fixture body. It is not limited to simply clamping the shut-off valve, and the fixture body distributes the weight of the shut-off valve. This improves stability during rotation without damaging the structure, extending the service life of the device, improving the milling effect, and enhancing the working efficiency of the fixture.

[0032] The seventh electric push rod 415 is activated to push the sliding rectangular block 412 downward to compress the tension spring 411. During the movement, the milling port of the shut-off valve is raised, and the tension spring 411 provides a rebound force for subsequent force release and reset. This allows the shut-off valve port to adjust itself during milling, improving the clamping effect and flexibility of the fixture body. It also improves stability during rotation without damaging the structure, extending the service life of the device and improving both the milling effect and the working efficiency of the fixture.

[0033] The second electric push rod 303 is activated to push the milling structure 311 down to perform milling work on the end face. To improve the flexibility of milling range and angle adjustment, the first motor 307 is activated to drive the output end of the milling structure 311 to adjust the angle. Then, during the milling process, the milling structure 311 can be pushed to move in parallel by the third electric push rod 306. When the milling work is used for horizontal work, the fourth electric push rod 312 can be activated to push the protective ring 313 to the milling point. Then, while providing a protective effect, it can also collect milling debris, thereby improving the milling range of the device and the cleaning effect of the device.

[0034] The two sets of elastic molding plates 427 are positioned at the two ends of the unprocessed port of the shut-off valve. Then, the ninth electric push rod 422 is activated to push the elastic molding plates 427 towards the port. Upon contact with the port, the two sets of third connecting blocks 426 begin to compress the elastic molding plates 427. The elastic molding plates 427 then limit the shut-off valve port. Furthermore, when facing shut-off valves with different ports, the second motor 423 can drive the elastic molding plates 427 to rotate and adjust their position, improving the compatibility of bending and limiting.

[0035] Pushing the two sets of sliding plates 209 to compress the spring 210, then placing the shut-off valve on the third fixed plate 207, and then stopping the pushing of the two sets of sliding plates 209. When the spring 210 senses the pressure disappearing, it begins to rebound, causing the two sets of sliding plates 209 to limit and clamp the shut-off valve, thus speeding up the clamping process. Then, the air pump 420 is started to fill the air bag structure 419 with gas, so that the air bag structure 419 expands and limits and stabilizes the inner wall of the shut-off valve, improving the internal stability effect and expanding the limiting range of the device.

[0036] Based on the aforementioned milling fixture for machining the end face of a gate valve, this embodiment of the invention also proposes a method for milling the end face of a gate valve. Exemplarily, the method includes: Push the two sets of sliding plates to move closer to the second fixed block in the slide groove, and start to compress the spring; Place the shut-off valve on the third fixed plate, stop pushing the two sets of sliding plates, and the compression spring will rebound after sensing the pressure disappears, thus driving the two sets of sliding plates to limit and clamp the shut-off valve. Start the fifth electric push rod to raise the second connecting block to the same level as the shut-off valve, then start the sixth electric push rod to push the two sets of elastic plastic plates to the two ends of the shut-off valve's unprocessed port; The ninth electric push rod is activated to push the elastic plastic plate towards the port. When it contacts the port, it begins to drive the two sets of third connecting blocks to squeeze the elastic plastic plate. Start the eighth electric push rod to push the fixed plate to extend into the shut-off valve, and then start the air pump to fill the air bag structure with gas, so that the air bag structure expands and limits the inner wall of the shut-off valve. The electric slide table moves the milling structure to the designated position, and the second electric push rod is activated to push the milling structure down to perform milling work on the end face. The first motor is started, which drives the transmission column to rotate. At the same time, the rotation of the transmission column drives the third mounting plate to rotate. While the third mounting plate rotates, it also drives the output end of the milling structure to adjust the angle. During the milling process, the milling structure can be moved in parallel by the third electric push rod. The fourth electric push rod is activated to move the protective ring to the milling point to collect the milling debris; The seventh electric push rod is activated to push the sliding rectangular block downwards, compressing and stretching the spring. During the movement, the third connecting plate is also lowered. During the descent, the third connecting plate drives the rotating tube to rotate within the sliding rectangular block, which in turn drives one end of the clamped shut-off valve to move downward. As one end of the shut-off valve is pressed down, it drives the two sets of second fixed blocks to rotate on the outer wall of the rotating rod, which in turn drives the middle end of the shut-off valve to rotate.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A milling fixture for machining the end face of a gate valve, comprising a milling base (1), characterized in that: A fixing component (2) is installed at the top center of the milling base (1), a milling component (3) is installed at the top edge of the milling base (1), and a clamping component (4) is installed at the top end of the milling base (1) away from the milling component (3). The clamp assembly (4) includes two sets of second connecting plates (406). Each set of second connecting plates (406) has a set of mounting blocks (408) installed on the bottom inner wall. Each set of mounting blocks (408) has a set of connecting rods (409) installed on the top. Each set of mounting blocks (408) has one end of a set of tension springs (411) installed on the top. Each set of tension springs (411) has a set of sliding rectangular blocks (412) installed on the other end. Each set of second connecting plates (406) has a set of seventh electric push rods (415) installed on the top inner wall. Each set of sliding rectangular blocks (412) has a set of rotating tubes (413) rotatably connected to one side wall. A third connecting plate (416) is connected between the two sets of rotating tubes (413). An eighth electric push rod (417) is installed on one side wall of the third connecting plate (416). A fixed plate (418) is installed on the output end of the eighth electric push rod (417). An air bag structure (419) is sleeved on the outer wall of the fixed plate (418). An air pump (420) is installed on the outer wall of the fixed plate (418). Two sets of fifth connecting plates (424) are symmetrically arranged on one end of the third connecting plate (416) near the eighth electric push rod (417). Two sets of slide rails (425) are symmetrically opened on one side wall of each set of fifth connecting plates (424). A set of third connecting blocks (426) is slidably connected in each set of slide rails (425). An elastic plastic plate (427) is connected between the two sets of third connecting blocks (426). During the movement, the milling port of the shut-off valve is raised, and during this process, the stretching spring (411) provides a rebound force for subsequent discharge reset.

2. The milling fixture for machining the end face of a gate valve according to claim 1, characterized in that: The fixing component (2) includes a first fixing plate (201), the bottom of which is mounted on the top of the milling base (1). A first electric push rod (202) is mounted on the top of the first fixing plate (201). A second fixing plate (203) is mounted on the output end of the first electric push rod (202). Two sets of first fixing blocks (204) are symmetrically mounted on the top edge of the second fixing plate (203). A set of rotating rods (205) is mounted on the corresponding side wall of each of the two sets of first fixing blocks (204).

3. A milling fixture for machining the end face of a gate valve according to claim 2, characterized in that: Each set of rotating rods (205) is rotatably connected to a set of second fixing blocks (206). A third fixing plate (207) is connected between the bottoms of the two sets of second fixing blocks (206). A sliding groove (208) is provided on the top of the third fixing plate (207). Two sets of sliding plates (209) are slidably connected in the sliding groove (208). One end of a compression spring (210) is installed on one side wall of each set of sliding plates (209). The other end of each set of compression springs (210) is installed on one of the sets of second fixing blocks (206).

4. A milling fixture for machining the end face of a gate valve according to claim 1, characterized in that: The milling assembly (3) includes a support plate (301), the bottom of which is mounted on the top edge of the milling base (1). An electric slide (302) is mounted on one side wall of the support plate (301). A second electric push rod (303) is connected to the output end of the electric slide (302). A first mounting plate (304) is mounted on the output end of the second electric push rod (303). A second mounting plate (305) is mounted on the bottom of the first mounting plate (304).

5. A milling fixture for machining the end face of a gate valve according to claim 4, characterized in that: A third electric push rod (306) is installed on one side wall of the second mounting plate (305). A first motor (307) is installed on the output end of the third electric push rod (306). A transmission column (308) is connected to the output end of the first motor (307). A sleeve ring (309) is sleeved on the outer wall of the transmission column (308). A third mounting plate (310) is installed on the outer wall of the sleeve ring (309). A milling structure (311) is installed on the bottom of the third mounting plate (310).

6. A milling fixture for machining the end face of a gate valve according to claim 1, characterized in that: The fixture assembly (4) further includes a first connecting block (401), the bottom of which is mounted on the top edge of the milling base (1). A fifth electric push rod (402) is mounted on the top of the first connecting block (401). A second connecting block (403) is mounted on the output end of the fifth electric push rod (402). A sixth electric push rod (404) is mounted on one side wall of the second connecting block (403). A first connecting plate (405) is mounted on the output end of the sixth electric push rod (404). One end of each set of second connecting plates (406) is mounted on the edge of one side wall of the first connecting plate (405).

7. A milling fixture for machining the end face of a gate valve according to claim 6, characterized in that: Each of the two sets of second connecting plates (406) has a set of sliding cavities (407) on one side wall. Each set of tension springs (411) is sleeved on the connecting rod (409). Each set of sliding rectangular blocks (412) is sleeved on the connecting rod (409). The outer wall of each set of sliding rectangular blocks (412) is slidably connected in the sliding cavity (407). Each set of sliding rectangular blocks (412) has a set of pressure relief blocks (414) installed on the top.

8. A method for using a milling fixture for machining the end face of a gate valve according to any one of claims 1-7, characterized in that: The working method includes: The fixing assembly is activated to limit and clamp the middle of the shut-off valve. The clamping assembly is activated to bend and clamp the two ends of the gate valve that are not being processed, and to limit the movement of the inner wall of the gate valve. Start the milling assembly to mill the end face of the shut-off valve; The seventh electric actuator is activated to push the sliding rectangular block downwards, compressing and stretching the spring. During the movement, one end of the clamped shut-off valve moves downwards.

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