Valve hemispherical valve core machining assembly fixture and its clamping method

Abstract

This invention discloses a combined fixture and clamping method for machining hemispherical valve cores, relating to the field of hemispherical valve core machining technology. It includes a base, a mounting plate on the top surface of the base, a cylindrical tube in the middle of the top surface of the mounting plate, and an arc-shaped support plate on top of the cylindrical tube. A rectangular groove is symmetrically formed on the top surface of the mounting plate, and an external clamping mechanism is located within the rectangular groove. An internal clamping mechanism is located on the outer surface of the inner top of the cylindrical tube, and a driving mechanism is located within the mounting plate. This invention uses gas to drive the external and internal clamping mechanisms to work synchronously, thereby externally clamping and internally fixing the hemispherical valve core, thus improving the stability of the valve core clamping. Simultaneously, the use of a sealing component ensures that even after the external clamping is released, the internal clamping continues to clamp and fix the hemispherical valve core, avoiding errors caused by repeated disassembly or installation of the valve core, improving the machining accuracy of the hemispherical valve core, and enhancing the valve's sealing performance.

Description

Technical Field

[0001] This invention relates to the field of valve hemispherical valve core technology processing technology, and in particular to valve hemispherical valve core processing assembly fixture and clamping method. Background Technology

[0002] During the machining of the dome valve's hemispherical valve core, it is necessary to clamp and fix the valve core, which requires the use of a fixture. Existing fixtures, however, require repeated disassembly and reassembly of the valve core due to the different processes involved in machining it. Each installation introduces errors, leading to the accumulation of these errors and reducing the machining accuracy of the valve core, further affecting the valve's sealing performance. Furthermore, existing fixtures often exert excessive clamping force, causing clamping marks on the surface of the valve core and impacting its quality. Therefore, these problems need to be addressed. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a valve hemispherical valve core machining assembly fixture and its clamping method.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A combination fixture for machining a hemispherical valve core and its clamping method, comprising a base, a mounting plate disposed on the top surface of the base, a cylindrical tube disposed in the middle of the top surface of the mounting plate, and an arc-shaped support plate disposed on the top of the cylindrical tube. The top surface of the mounting plate is symmetrically provided with rectangular grooves, and an external clamping mechanism is disposed in the rectangular grooves. An internal clamping mechanism is disposed on the outer side of the top of the cylindrical tube. A driving mechanism for driving the external clamping mechanism and the internal clamping mechanism is disposed in the mounting plate. A sealing mechanism is disposed between the cylindrical tube and the mounting plate.

[0006] The drive mechanism includes an air guide chamber A located in the middle of the mounting plate and an air guide chamber B located in the middle of the top surface of the mounting plate and communicating with a cylindrical tube. The bottom of the air guide chamber B is connected to the air guide chamber A through a cylindrical hole. A sealing component is provided in the cylindrical hole. Both ends of the air guide chamber A are connected to a rectangular groove. An air inlet pipe with a valve is provided at one end of the air guide chamber A. An exhaust pipe with a valve is provided on the outer wall of the bottom of the cylindrical tube.

[0007] Preferably, the sealing assembly includes a sealing block disposed in a cylindrical hole, and the diameter of the top of the sealing block is smaller than the inner diameter of the air guide cavity B. Short plates are symmetrically arranged on the inner wall of the top of the air guide cavity B, and S-shaped spring pieces are symmetrically arranged between the short plates and the sealing block.

[0008] Preferably, the external clamping mechanism includes a sliding plate slidably disposed in a rectangular groove, an external fixing plate disposed on the top surface of the sliding plate, and a rubber airbag disposed on the inner wall of the top of the external fixing plate. A reset component is provided at the inner end of the rectangular groove, a strip sealing plate is provided on the outer wall of the sliding plate, a strip cavity is opened on one side of the rectangular groove in conjunction with the strip sealing plate, and the strip sealing plate and the strip cavity are dynamically sealed. A reinforcing component is provided inside the external fixing plate.

[0009] Preferably, the reinforcement component includes a strip-shaped air cavity symmetrically formed within the outer fixing plate, a rectangular limiting plate disposed at the bottom of the strip-shaped air cavity, and a piston slidably disposed at the top of the strip-shaped air cavity. The bottom surface of the piston is provided with a fixing rod, and the bottom of the fixing rod extends movably through to the bottom of the rectangular limiting plate. A return spring is sleeved on the outer wall of the fixing rod between the piston and the rectangular limiting plate. The top of the strip-shaped air cavity communicates with the bottom of the rubber airbag. Multiple fixing grooves are evenly formed on both sides of the mounting plate on both sides of the rectangular groove in cooperation with the fixing rod. One side of the fixing groove is inclined, and the bottom of the fixing rod is arc-shaped.

[0010] Preferably, the reset assembly includes a rectangular sealing cavity formed on the inner side of the rectangular groove, a rectangular sealing plate slidably disposed in the rectangular sealing cavity, a connecting rod disposed on one side of the rectangular sealing plate, and one end of the connecting rod being fixedly connected to the sliding plate.

[0011] Preferably, the inner wall of the outer fixing plate is provided with a plurality of stabilizing grooves evenly distributed, and the outer wall of the rubber airbag is provided with a plurality of stabilizing components in accordance with the stabilizing grooves. The stabilizing components are composed of a plurality of semi-circular rubber blocks, and the stabilizing grooves are composed of a plurality of semi-circular grooves.

[0012] Preferably, the inner clamping mechanism includes a circular sealing plate slidably disposed on the bottom of the cylindrical tube, a sliding rod disposed in the middle of the top surface of the circular sealing plate, and a circular limiting plate disposed on the inner wall of the middle part of the sliding rod. The top of the sliding rod extends movably through to the top of the circular limiting plate and is fixedly connected to a four-sided platform connector. Multiple guide rods are provided annularly at equal intervals on the outer wall of the cylindrical tube. The inner end of the guide rod is provided with a right-angled triangular block in conjunction with the four-sided platform connector. Z-shaped spring pieces are symmetrically provided between the right-angled triangular block and the cylindrical tube. The outer end of the guide rod extends movably through the outside of the cylindrical tube and is provided with an inner fixing plate. A compression spring is sleeved on the outer wall of the sliding rod between the circular sealing plate and the circular limiting plate.

[0013] Preferably, the sealing mechanism includes an upper sealing groove formed on the bottom surface of the cylindrical tube, a lower sealing groove formed on the top surface of the mounting plate, a sealing airbag provided at the top of the lower sealing groove, the lower sealing groove and the upper sealing groove being composed of multiple annular arc-shaped cavities of varying heights, and an air guide tube provided on the inner wall of the sealing airbag, one end of the air guide tube being connected to the air guide cavity B.

[0014] This invention also proposes a clamping method for a valve hemispherical valve core machining assembly fixture, comprising the following steps:

[0015] S1: First, place the valve hemispherical valve core on the outer wall of the arc support plate, and then inject gas into the air guide chamber A through the air inlet pipe to increase the pressure in the air guide chamber A, thereby driving the sliding plate to move, and further driving the outer fixing plate. The clamping force between the two outer fixing plates is used to externally clamp and fix the valve hemispherical valve core.

[0016] S2: After clamping the valve core on the hemispherical surface of the valve, the rubber air bladder will be squeezed, allowing the gas inside the rubber air bladder to enter the strip-shaped air cavity, which in turn pushes the strip-shaped air cavity downward, thereby allowing the fixing rod to be inserted into the fixing groove.

[0017] S3: After the valve core is clamped and fixed outside, the gas will continue to enter the air guide chamber A, and then it will lift the sealing block. Then the gas will enter the air guide chamber B through the cylindrical hole. A part of the gas will enter the sealing air bag through the air guide tube, causing the sealing air bag to expand and fill the entire upper and lower sealing grooves, thus achieving the seal between the cylindrical tube and the mounting plate.

[0018] S4: Another part of the gas will enter the cylindrical tube, pushing the sealing block to move upward, which in turn drives the sliding rod and the four-sided platform connector to move upward, thereby pushing out the inner fixing plate. Through several inner fixing plates, the valve core of the valve hemisphere is clamped from the inside.

[0019] S5: When machining the outer wall of the valve hemispherical valve core, if the outer fixing plate affects the machining of the valve hemispherical valve core, the outer fixing plate will compress the air pressure in the rectangular sealing cavity when it is fixed to the valve hemispherical valve core. Therefore, after opening the valve on the outer wall of the air inlet pipe, the rectangular sealing plate will reset under the action of losing the pressure in the air guide cavity A, which will further drive the outer fixing plate to reset, so that the outer fixing plate is separated from the valve hemispherical valve core. Since the gas in the air guide cavity B will not be lost under the action of the sealing component, the valve hemispherical valve core will be further internally clamped and fixed.

[0020] S6: After the valve hemispherical valve core is processed, the gas at the bottom of the cylindrical tube is opened and the circular sealing plate is moved downward under the action of the compression spring, thereby causing the four-sided platform connector to separate from the right-angled triangular block. Under the action of the Z-shaped spring, the inner fixing plate is separated from the inner wall of the valve hemispherical valve core, thus releasing the fixation of the valve hemispherical valve core.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention utilizes a gas-driven external clamping mechanism and an internal clamping mechanism to work synchronously, thereby externally clamping and internally fixing the valve hemispherical core, thus improving the stability of the valve hemispherical core clamping. Simultaneously, the use of the sealing component ensures that even after the external clamping is released, the internal clamping continues to clamp and fix the valve hemispherical core, avoiding errors caused by repeated disassembly or installation of the valve hemispherical core, improving the machining accuracy of the valve hemispherical core, and enhancing the valve's sealing performance. Furthermore, the use of the sealing mechanism improves the sealing between the cylindrical tube and the mounting plate, preventing gas leakage from the air guide chamber B, thus ensuring the operation of the internal clamping mechanism.

[0023] 2. After the hemispherical valve core is clamped and fixed by the external clamping mechanism, the rubber airbag is compressed, which allows the fixing rod in the reinforcement component to be inserted into the fixing groove. This prevents the external fixing plate from clamping the hemispherical valve core too tightly, thus protecting the hemispherical valve core. At the same time, the fixing rod also strengthens the bottom of the external fixing plate, preventing the bottom of the external fixing plate from breaking when clamping and fixing the hemispherical valve core, thereby improving the service life of the external fixing plate and ensuring the clamping and fixing of the hemispherical valve core. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0025] Figure 1 This is a schematic diagram of the external structure of the present invention from a frontal view.

[0026] Figure 2 This is a cross-sectional view of the mounting plate of the present invention from the frontal perspective;

[0027] Figure 3 This is a cross-sectional structural diagram of the cylindrical tube of the present invention from a frontal view.

[0028] Figure 4 This is a schematic cross-sectional view of the mounting plate and cylindrical tube of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the external fixing plate of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the external fixing plate and the rubber airbag deployed according to the present invention;

[0031] Figure 7 This is a cross-sectional structural diagram of the external fixing plate from a side view of the present invention.

[0032] In the diagram, the components are numbered as follows: 1. Base; 2. Mounting plate; 3. Cylindrical tube; 4. Rectangular groove; 5. Outer fixing plate; 6. Rubber airbag; 7. Arc-shaped support plate; 8. Air inlet pipe; 9. Strip-shaped sealing plate; 10. Sliding plate; 11. Rectangular sealing plate; 12. Rectangular sealing cavity; 13. Sealing block; 14. S-shaped spring; 15. Connecting rod; 16. Air guide cavity A; 17. Inner fixing plate; 18. Z-shaped spring; 19. Guide rod. 20. Four-sided platform connector; 21. Circular limiting plate; 22. Sliding rod; 23. Circular sealing plate; 24. Upper sealing groove; 25. Lower sealing groove; 26. Air guide chamber B; 27. Sealing airbag; 28. Air guide tube; 29. ​​Right-angled triangular block; 30. Strip cavity; 31. Stabilizing groove; 32. Stabilizing component; 33. Piston; 34. Fixing rod; 35. Return spring; 36. Rectangular limiting plate; 37. Strip air cavity. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] Example 1: See Figure 1-7 A valve hemispherical core machining assembly fixture and its clamping method include a base 1, a mounting plate 2 disposed on the top surface of the base 1, a cylindrical cylinder 3 disposed in the middle of the top surface of the mounting plate 2, and an arc-shaped support plate 7 disposed on the top of the cylindrical cylinder 3. The top surface of the mounting plate 2 has symmetrically opened rectangular grooves 4, and an external clamping mechanism is provided within the rectangular grooves 4. The external clamping mechanism facilitates the clamping and fixing of the valve hemispherical core from the outside. An internal clamping mechanism is provided on the outer surface of the top of the cylindrical cylinder 3, facilitating the clamping and fixing of the valve hemispherical core from the inside. The combined use of the external clamping mechanism and the internal clamping mechanism facilitates the synchronous clamping and fixing of the valve hemispherical core from the outside and inside, thereby improving the stability of the valve hemispherical core clamping. The mounting plate 2 is equipped with a drive mechanism for driving the external clamping mechanism and the internal clamping mechanism. The use of the drive mechanism facilitates the operation of the external clamping mechanism and the internal clamping mechanism. A sealing mechanism is provided between the cylindrical cylinder 3 and the mounting plate 2. The use of the sealing mechanism improves the sealing performance between the cylindrical cylinder 3 and the mounting plate 2, prevents air leakage in the air guide cavity B26, and thus ensures the operation of the internal clamping mechanism.

[0035] The drive mechanism includes an air guide chamber A16 located in the middle of the mounting plate 2 and an air guide chamber B26 located in the middle of the top surface of the mounting plate 2 and connected to the cylindrical cylinder 3. The bottom of the air guide chamber B26 is connected to the air guide chamber A16 through a cylindrical hole. A sealing component is provided in the cylindrical hole. By using the sealing component, it is easy to block the cylindrical hole at the bottom of the air guide chamber B26, preventing the gas in the air guide chamber B26 from flowing back into the air guide chamber A16. This ensures that the inner clamping mechanism continues to work after the outer clamping mechanism is released, which facilitates the processing of the outer wall of the valve hemispherical valve core. The two ends of the air guide chamber A16 are connected to the rectangular groove 4. One end of the air guide chamber A16 is provided with an air inlet pipe 8 with a valve, and the bottom outer wall of the cylindrical cylinder 3 is provided with an exhaust pipe with a valve.

[0036] In this invention, the sealing assembly includes a sealing block 13 disposed in a cylindrical hole, and the diameter of the top of the sealing block 13 is smaller than the inner diameter of the air guide cavity B26. Short plates are symmetrically arranged on the inner wall of the top of the air guide cavity B26, and S-shaped spring pieces 14 are symmetrically arranged between the short plates and the sealing block 13.

[0037] In this invention, the external clamping mechanism includes a sliding plate 10 slidably disposed within a rectangular groove 4, an external fixing plate 5 disposed on the top surface of the sliding plate 10, and a rubber airbag 6 disposed on the inner wall of the top of the external fixing plate 5. A reset assembly is provided at the inner end of the rectangular groove 4, and a strip-shaped sealing plate 9 is provided on the outer wall of the sliding plate 10. A strip-shaped cavity 30 is formed on one side of the rectangular groove 4 in conjunction with the strip-shaped sealing plate 9, and the strip-shaped sealing plate 9 and the strip-shaped cavity 30 are dynamically sealed. A reinforcing assembly is provided inside the external fixing plate 5. By compressing the rubber airbag 6, the fixing rod 34 in the reinforcing assembly is inserted into the fixing groove, which prevents the external fixing plate 5 from clamping the valve hemispherical valve core too tightly, thereby facilitating the protection of the valve hemispherical valve core. At the same time, the fixing rod 34 can strengthen the bottom of the external fixing plate 5, preventing the bottom of the external fixing plate 5 from breaking when clamping and fixing the valve hemispherical valve core, thereby improving the service life of the external fixing plate 5.

[0038] In this invention, the reinforcement component includes a strip-shaped air cavity 37 symmetrically opened in the outer fixing plate 5, a rectangular limiting plate 36 set at the bottom of the strip-shaped air cavity 37, and a piston 33 slidably set at the top of the strip-shaped air cavity 37. The bottom surface of the piston 33 is provided with a fixing rod 34, and the bottom of the fixing rod 34 moves through to the bottom of the rectangular limiting plate 36. A return spring 35 is sleeved on the outer wall of the fixing rod 34 between the piston 33 and the rectangular limiting plate 36. The top of the strip-shaped air cavity 37 is connected to the bottom of the rubber airbag 6. Multiple fixing grooves are evenly opened on both sides of the mounting plate 2 on both sides of the rectangular groove 4 in cooperation with the fixing rod 34. One side of the fixing groove is inclined, and the bottom of the fixing rod 34 is arc-shaped to facilitate the reset of the outer fixing plate 5.

[0039] In this invention, the reset assembly includes a rectangular sealing cavity 12 formed on the inner side of the rectangular groove 4, a rectangular sealing plate 11 slidably disposed in the rectangular sealing cavity 12, a connecting rod 15 disposed on one side of the rectangular sealing plate 11, and one end of the connecting rod 15 is fixedly connected to the sliding plate 10. By squeezing the gas in the rectangular sealing cavity 12 to replace the spring, it is beneficial to reset the outer fixing plate 5.

[0040] In this invention, a plurality of stabilizing grooves 31 are evenly provided on the inner wall of the outer fixing plate 5, and a plurality of stabilizing elements 32 are provided on the outer wall of the rubber airbag 6 in conjunction with the stabilizing grooves 31. The stabilizing elements 32 are composed of a plurality of semi-circular rubber blocks, and the stabilizing grooves 31 are composed of a plurality of semi-circular grooves. Through the combined use of the stabilizing elements 32 and the stabilizing grooves 31, the contact area between the rubber airbag 6 and the outer fixing plate 5 is increased, and the rubber airbag 6 is prevented from separating from the outer fixing plate 5 during the processing of the valve hemispherical valve core surface, thereby making the connection between the rubber airbag 6 and the outer fixing plate 5 more stable.

[0041] In this invention, the inner clamping mechanism includes a circular sealing plate 23 slidably disposed on the bottom of the inner cylindrical tube 3, a sliding rod 22 disposed in the middle of the top surface of the circular sealing plate 23, and a circular limiting plate 21 disposed on the inner wall of the middle part of the sliding rod 22. The top of the sliding rod 22 extends movably through to the top of the circular limiting plate 21 and is fixedly connected to a four-sided platform connector 20. A plurality of guide rods 19 are provided at equal intervals in an annular pattern on the outer wall of the cylindrical tube 3. The inner end of the guide rod 19 is provided with a right-angled triangular block 29 in conjunction with the four-sided platform connector 20. Z-shaped spring pieces 18 are symmetrically provided between the right-angled triangular block 29 and the cylindrical tube 3. The outer end of the guide rod 19 extends movably through the outer side of the cylindrical tube 3 and is provided with an inner fixing plate 17. A compression spring is sleeved on the outer wall of the sliding rod 22 between the circular sealing plate 23 and the circular limiting plate 21.

[0042] In this invention, the sealing mechanism includes an upper sealing groove 24 formed on the bottom surface of the cylindrical tube 3, a lower sealing groove 25 formed on the top surface of the mounting plate 2, a sealing airbag 27 formed at the top of the lower sealing groove 25, and the lower sealing groove 25 and the upper sealing groove 24 are composed of multiple annular arc-shaped cavities of different heights. An air guide tube 28 is provided on the inner wall of the sealing airbag 27, and one end of the air guide tube 28 is connected to the air guide cavity B26.

[0043] Working principle: In this embodiment, the present invention also proposes a clamping method for a valve hemispherical valve core machining assembly fixture, including the following steps:

[0044] Step 1: First, place the valve hemispherical valve core on the outer wall of the arc support plate 7, and then inject gas into the air guide chamber A16 through the air inlet pipe 8 to increase the pressure in the air guide chamber A16, thereby driving the sliding plate 10 to move, and further driving the outer fixing plate 5. The clamping force between the two outer fixing plates 5 is used to externally clamp and fix the valve hemispherical valve core.

[0045] Step 2: After clamping the hemispherical valve core, the rubber air bladder 6 will be compressed, allowing the gas inside the rubber air bladder 6 to enter the strip-shaped air chamber 37. This will push the strip-shaped air chamber 37 downward, thereby allowing the fixing rod 34 to be inserted into the fixing groove. By inserting the fixing rod 34 into the fixing groove, the outer fixing plate 5 is prevented from clamping the hemispherical valve core too tightly, thus facilitating the protection of the hemispherical valve core. At the same time, the fixing rod 34 can strengthen the bottom of the outer fixing plate 5, preventing the bottom of the outer fixing plate 5 from breaking when clamping and fixing the hemispherical valve core, thereby improving the service life of the outer fixing plate 5.

[0046] Step 3: After the valve core is clamped and fixed, the gas will continue to enter the air guide chamber A16, which will then lift the sealing block 13. The gas will then enter the air guide chamber B26 through the cylindrical hole, and a portion of the gas will enter the sealing airbag 27 through the air guide pipe 28, causing the sealing airbag 27 to expand and fill the entire upper sealing groove 24 and lower sealing groove 25, thereby achieving a seal between the cylindrical cylinder 3 and the mounting plate 2, preventing gas leakage in the air guide chamber B26, and thus ensuring the operation of the inner clamping mechanism.

[0047] Step 4: Another portion of the gas will enter the cylindrical tube 3, pushing the sealing block 13 upward, which in turn moves the sliding rod 22 and the four-sided platform connector 20 upward, thereby pushing out the inner fixing plate 17. Through the outward pushing of several inner fixing plates 17, the valve hemispherical core is clamped from the inside. In particular, by clamping and fixing the valve hemispherical core from both the outside and the inside, the phenomenon of shaking of the valve hemispherical core during processing is avoided, which is beneficial to the processing of the valve hemispherical core.

[0048] Step 5: When machining the outer wall of the valve hemispherical valve core, if the outer fixing plate 5 affects the machining of the valve hemispherical valve core, the outer fixing plate 5 will compress the air pressure in the rectangular sealing cavity 12 when it is fixed to the valve hemispherical valve core. Therefore, after opening the valve on the outer wall of the air inlet pipe 8, the rectangular sealing plate 11 will reset under the action of losing the pressure in the air guide cavity A16, further driving the outer fixing plate 5 to reset, so that the outer fixing plate 5 is separated from the valve hemispherical valve core. Since the gas in the air guide cavity B26 will not be lost under the action of the sealing component, the valve hemispherical valve core will be further internally clamped and fixed, which facilitates the continued machining of the valve hemispherical valve core and improves the machining efficiency of the valve hemispherical valve core.

[0049] Step Six: After the valve hemispherical core is processed, the gas outlet at the bottom of the cylindrical tube 3 is opened, and the circular sealing plate 23 is moved downward under the action of the compression spring, thereby causing the four-sided platform connector 20 to separate from the right-angled triangular block 29. Under the action of the Z-shaped spring piece 18, the inner fixing plate 17 is separated from the inner wall of the valve hemispherical core, releasing the fixation of the valve hemispherical core, thus facilitating the disassembly of the valve hemispherical core.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A valve hemispherical valve core machining assembly fixture, comprising a base, a mounting plate disposed on the top surface of the base, a cylindrical tube disposed in the middle of the top surface of the mounting plate, and an arc-shaped support plate disposed on the top of the cylindrical tube, characterized in that: The top surface of the mounting plate is symmetrically provided with rectangular slots, and an outer clamping mechanism is provided in the rectangular slots. An inner clamping mechanism is provided at the top of the cylindrical tube. The mounting plate is provided with a drive mechanism for driving the outer clamping mechanism and the inner clamping mechanism. A sealing mechanism is provided between the cylindrical tube and the mounting plate. The drive mechanism includes an air guide chamber A located in the middle of the mounting plate and an air guide chamber B located in the middle of the top surface of the mounting plate and connected to a cylindrical tube. The bottom of the air guide chamber B is connected to the air guide chamber A through a cylindrical hole. A sealing component is provided in the cylindrical hole. Both ends of the air guide chamber A are connected to a rectangular groove. An air inlet pipe with a valve is provided at one end of the air guide chamber A, and an exhaust pipe with a valve is provided on the outer wall of the bottom of the cylindrical tube. The sealing assembly includes a sealing block disposed in a cylindrical hole, and the diameter of the top of the sealing block is smaller than the inner diameter of the air guide cavity B. Short plates are symmetrically arranged on the inner wall of the top of the air guide cavity B, and S-shaped spring pieces are symmetrically arranged between the short plates and the sealing block. The external clamping mechanism includes a sliding plate slidably disposed in a rectangular groove, an external fixing plate disposed on the top surface of the sliding plate, and a rubber airbag disposed on the inner wall of the top of the external fixing plate. A reset component is provided at the inner end of the rectangular groove, a strip sealing plate is provided on the outer wall of the sliding plate, a strip cavity is opened on one side of the rectangular groove in conjunction with the strip sealing plate, and the strip sealing plate and the strip cavity are dynamically sealed. A reinforcement component is provided inside the external fixing plate. The internal clamping mechanism includes a circular sealing plate slidably disposed on the bottom of the cylindrical tube, a sliding rod disposed in the middle of the top surface of the circular sealing plate, and a circular limiting plate disposed on the inner wall of the middle part of the sliding rod. The top of the sliding rod extends movably through to the top of the circular limiting plate and is fixedly connected to a four-sided platform connector. Multiple guide rods are provided at equal intervals in a ring on the outer wall of the cylindrical tube. A right-angled triangular block is provided at the inner end of the guide rod in conjunction with the four-sided platform connector. Z-shaped spring pieces are symmetrically provided between the right-angled triangular block and the cylindrical tube. The outer end of the guide rod extends movably through the outside of the cylindrical tube and is provided with an inner fixing plate. A compression spring is sleeved on the outer wall of the sliding rod between the circular sealing plate and the circular limiting plate.

2. The valve hemispherical valve core machining assembly fixture according to claim 1, characterized in that: The reinforcement component includes a strip-shaped air cavity symmetrically opened in the outer fixing plate, a rectangular limiting plate set at the bottom of the strip-shaped air cavity, and a piston slidably set at the top of the strip-shaped air cavity. The bottom surface of the piston is provided with a fixing rod, and the bottom of the fixing rod moves through to the bottom of the rectangular limiting plate. A return spring is sleeved on the outer wall of the fixing rod between the piston and the rectangular limiting plate. The top of the strip-shaped air cavity is connected to the bottom of the rubber airbag. Multiple fixing grooves are evenly opened on both sides of the mounting plate on both sides of the rectangular groove in cooperation with the fixing rod. One side of the fixing groove is inclined, and the bottom of the fixing rod is arc-shaped.

3. The valve hemispherical valve core machining assembly fixture according to claim 2, characterized in that: The reset assembly includes a rectangular sealing cavity formed on the inner side of a rectangular groove, a rectangular sealing plate slidably disposed inside the rectangular sealing cavity, a connecting rod disposed on one side of the rectangular sealing plate, and one end of the connecting rod being fixedly connected to the sliding plate.

4. The valve hemispherical valve core machining assembly fixture according to claim 3, characterized in that: Multiple stabilizing grooves are evenly distributed on the inner wall of the outer fixing plate, and multiple stabilizing components are provided on the outer wall of the rubber airbag to match the stabilizing grooves. The stabilizing components are composed of multiple semi-circular rubber blocks, and the stabilizing grooves are composed of multiple semi-circular grooves.

5. The valve hemispherical valve core machining assembly fixture according to claim 4, characterized in that: The sealing mechanism includes an upper sealing groove on the bottom surface of the cylindrical tube, a lower sealing groove on the top surface of the mounting plate, a sealing airbag at the top of the lower sealing groove, and the lower and upper sealing grooves are composed of multiple annular arc-shaped cavities of different heights. A duct is provided on the inner wall of the sealing airbag, and one end of the duct is connected to the duct cavity B.

6. The clamping method of the valve hemispherical valve core machining assembly fixture according to any one of claims 1-5, characterized in that, Includes the following steps: S1: First, place the valve hemispherical valve core on the outer wall of the arc support plate, and then inject gas into the air guide chamber A through the air inlet pipe to increase the pressure in the air guide chamber A, thereby driving the sliding plate to move, and further driving the outer fixing plate. The clamping force between the two outer fixing plates is used to externally clamp and fix the valve hemispherical valve core. S2: After clamping the valve core on the hemispherical surface of the valve, the rubber air bladder will be squeezed, allowing the gas inside the rubber air bladder to enter the strip-shaped air cavity, which in turn pushes the strip-shaped air cavity downward, thereby allowing the fixing rod to be inserted into the fixing groove. S3: After the valve core is clamped and fixed outside, the gas will continue to enter the air guide chamber A, and then it will lift the sealing block. Then the gas will enter the air guide chamber B through the cylindrical hole. A part of the gas will enter the sealing air bag through the air guide tube, causing the sealing air bag to expand and fill the entire upper and lower sealing grooves, thus achieving the seal between the cylindrical tube and the mounting plate. S4: Another part of the gas will enter the cylindrical tube, pushing the sealing block to move upward, which in turn drives the sliding rod and the four-sided platform connector to move upward, thereby pushing out the inner fixing plate. Through several inner fixing plates, the valve core of the valve hemisphere is clamped from the inside. S5: When machining the outer wall of the valve hemispherical valve core, if the outer fixing plate affects the machining of the valve hemispherical valve core, the outer fixing plate will compress the air pressure in the rectangular sealing cavity when it is fixed to the valve hemispherical valve core. Therefore, after opening the valve on the outer wall of the air inlet pipe, the rectangular sealing plate will reset under the action of losing the pressure in the air guide cavity A, which will further drive the outer fixing plate to reset, so that the outer fixing plate is separated from the valve hemispherical valve core. Since the gas in the air guide cavity B will not be lost under the action of the sealing component, the valve hemispherical valve core will be further internally clamped and fixed. S6: After the valve hemispherical valve core is processed, the gas at the bottom of the cylindrical tube is opened and the circular sealing plate is moved downward under the action of the compression spring, thereby causing the four-sided platform connector to separate from the right-angled triangular block. Under the action of the Z-shaped spring, the inner fixing plate is separated from the inner wall of the valve hemispherical valve core, thus releasing the fixation of the valve hemispherical valve core.

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