Valve needle assembly, valve device, method of machining a valve needle assembly and machining device

Abstract

The application discloses a valve needle assembly, a valve device, a valve needle assembly processing method and a processing device. The valve needle assembly comprises a bellows, a valve rod, a gasket and a valve needle. The bellows is sleeved on the outer periphery of the valve rod. One end of the bellows is tin soldered with the gasket, and the other end is tin soldered with the valve rod. The end of the valve rod, which is away from the gasket, extends out of the bellows. The valve needle is press-fitted on the outer periphery of the end of the valve rod, which is away from the gasket, and abuts against the end face of the end of the valve rod, which is away from the gasket. The end face of the end of the valve rod, which is away from the gasket, is a turning and milling processing surface. The application can improve the length consistency of the valve needle assembly, and avoid the problems of low production efficiency and the valve device opening degree failing to meet the design requirements caused by the poor length consistency of the valve needle assembly.

Description

Technical Field

[0001] This application relates to the field of valve device technology, and in particular to a valve needle assembly, a valve device using the valve needle assembly, and a method and apparatus for processing the valve needle assembly. Background Technology

[0002] The valve needle assembly and valve body are important components of the valve device. The valve needle assembly is assembled in the mounting cavity of the valve body. The length of the valve needle assembly and the length of the valve body mounting cavity are related to the opening degree of the valve device. If the length of the valve needle assembly is not consistent, it is easy to cause the valve device to fail to meet the design requirements. Moreover, it is necessary to assemble the valve needle assembly first and determine the length of the valve needle assembly before processing the valve body mounting cavity, resulting in low production efficiency.

[0003] Therefore, how to improve the length consistency of the valve needle assembly is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this application provides a valve needle assembly, which includes a bellows, a valve stem, a gasket, and a valve needle. The bellows is fitted around the outer periphery of the valve stem. One end of the bellows is soldered to the gasket, and the other end is soldered to the valve stem. The end of the valve stem away from the gasket extends out of the bellows. The valve needle is press-fitted around the outer periphery of the end of the valve stem away from the gasket and abuts against the end face of the valve stem away from the gasket. The end face of the valve stem away from the gasket is a milled surface.

[0005] A valve device is also provided, comprising a valve needle assembly, a drive assembly, and a valve body, characterized in that the valve needle assembly is the aforementioned valve needle assembly, the valve body has a mounting cavity, one end of the mounting cavity has a valve port, the end of the mounting cavity away from the valve port has a limiting surface, the valve needle assembly is mounted in the mounting cavity, the end face of the gasket of the valve needle assembly near the valve needle abuts against the limiting surface, and the drive assembly pushes the valve stem, causing the valve stem to drive the valve needle to move in the direction of closing the valve port.

[0006] A method for processing a valve needle assembly is also provided. The valve needle assembly is the valve needle assembly described above. The processing method is as follows: positioning the assembly, which includes a bellows, a valve stem, and a gasket assembled together. Using the end face of the gasket near the valve needle as the positioning reference surface, after positioning, milling the end face of the valve stem away from the gasket until the distance between the end face of the valve stem away from the gasket and the end face of the gasket near the valve needle is equal to a preset value.

[0007] A machining apparatus for a valve needle assembly is also provided for implementing the above machining method. The machining apparatus includes: a positioning component for positioning the assembly and a milling component for milling the end face of the valve stem away from the gasket.

[0008] This application can improve the length consistency of the valve needle assembly, avoiding the problems of low production efficiency and valve opening that cannot meet design requirements due to poor length consistency of the valve needle assembly. Attached Figure Description

[0009] Figure 1 A cross-sectional view of one embodiment of the valve core assembly provided in this application;

[0010] Figure 2 To adopt Figure 1 A partial sectional view of the valve assembly shown;

[0011] Figure 3 A schematic diagram of one embodiment of the processing apparatus for the valve core assembly provided in this application;

[0012] Figure 4 For use Figure 3 The diagram shows the state of the processing device processing one end face of the valve stem.

[0013] Figure 5 for Figure 3 Enlarged view of the positioning pressure head;

[0014] Figure 6 for Figure 3 Enlarged view of the center positioning seat;

[0015] Figure 7 for Figure 4 MM view;

[0016] Figure 8 This is a perspective view of a single clamping part of the clamping assembly.

[0017] The annotations in the attached figures are explained as follows:

[0018] 100 Valve core assembly; 101 Bellows, 101a Body, 101b Flanged part, 101c Riveted part; 102 Valve stem, 102a Riveted part; 103 Gasket; 104 Valve needle; 105 Bushing;

[0019] 200 Valve body, 201 Mounting cavity, 202 Valve port, 203 Limiting surface;

[0020] 300 driver components;

[0021] 400 processing unit;

[0022] 401 Positioning component, 4011 Positioning seat, 4011a Top seat, 4011b Base, A Through hole, B Positioning surface, C Clamping part mounting hole, C1 Top groove, C2 Bottom groove, D Elastic part mounting hole, E Recessed part, F Sleeve part, G Connecting hole; 4012 Positioning pressure head, 4012a Connecting hole, 4012b Clearance hole, K Pressing surface, 4013 Positioning fixture, 4013a Clamping part, H Clamping surface, I Notch, J Protrusion;

[0023] 402 Milling and Turning Assembly, 4021 Cutting Tool, 4022 Cutting Tool Drive Motor, 4023 Connecting Sleeve. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1 The valve needle assembly 100 includes a bellows 101, a valve stem 102, a gasket 103, a valve needle 104, a bushing 105, etc.

[0026] The bellows 101 includes a body portion 101a, which has a large elasticity, allowing the length dimension of the bellows 101 to fluctuate within a large range.

[0027] One end of the body portion 101a of the bellows 101 is folded along the length of the bellows 101 to form a flange portion 101b. The gasket 103 is fixed to this end of the bellows 101. Specifically, the gasket 103 has a central hole. The flange portion 101b of the bellows 101 is inserted into the central hole of the gasket 103 and soldered to the gasket 103, thereby achieving the fixed connection between the gasket 103 and the bellows 101.

[0028] The other end of the body portion 101a of the bellows 101 is first folded approximately along the length of the bellows 101 and then approximately folded radially to form a riveting portion 101c. The valve stem 102 is fixedly connected to this end of the bellows 101. Specifically, the bellows 101 is fitted onto the outer periphery of the valve stem 102. A portion of the outer periphery of the valve stem 102 protrudes radially outward to form a riveting portion 102a. The riveting portion 102a of the valve stem 102 and the riveting portion 101c of the bellows 101 are riveted and limited to each other and then soldered together, thereby achieving the fixed connection between the valve stem 102 and the bellows 101.

[0029] A bushing 105 is installed at the end of the valve stem 102 near the gasket 103, and a bellows 101 extends from the end of the valve stem 102 away from the gasket 103. The valve needle 104 is press-fitted onto the end of the valve stem 102 away from the gasket 103 and abuts against the end face of the valve stem 102 away from the gasket 103.

[0030] The end face of the valve stem 102 away from the gasket 103 is a milling surface. By milling the end face of the valve stem 102 away from the gasket 103, the axial distance L3 between the end face of the valve stem 102 away from the gasket 103 and the end face of the gasket 103 near the valve needle 104 in the natural state of the bellows 101 is equal to a preset value.

[0031] Specifically, the bellows 101 is generally a stamped and drawn part, while the valve needle 104 is generally a machined part. The bellows 101 can be made of copper or a copper alloy, which facilitates its stamping and drawing process. The valve stem 102 and the gasket 103 can also be made of copper or a copper alloy, which facilitates soldering with the bellows 101. Soldering ensures the reliable connection between the bellows 101, valve stem 102, and gasket 103. The valve needle 104 can be made of stainless steel, which ensures its strength and facilitates its machining.

[0032] like Figure 2 When the valve needle assembly 100 is applied to a valve device, the valve needle assembly 100 is installed in the mounting cavity 201 of the valve body 200. One end of the mounting cavity 201 of the valve body 200 is provided with a valve port 202, and the other end of the mounting cavity 201 away from the valve port 202 is provided with a limiting surface 203.

[0033] The end face of the gasket 103 of the valve needle assembly 100 near the valve needle 104 abuts against the limiting surface 203 of the valve body 200 for limiting. The drive assembly 300 of the valve device pushes the valve stem 102, specifically against the bushing 105 connected to the valve stem 102, causing the valve stem 102 to move the valve needle 104 toward the closed valve port 202 until point X of the valve needle 104 abuts against point Y of the valve port 202, at which point the valve port 202 is completely closed. During this period, the bellows 101 changes from its natural state to an elongated state, thereby accumulating elastic energy. When the driving force of the drive assembly 300 is removed, the bellows 101 releases its elastic energy, and the valve needle 104 and valve stem 102, under the action of the elastic energy of the bellows 101 and the pressure of the medium inside the valve, reset toward the open valve port 202, thereby gradually restoring the bellows 101 to its natural state.

[0034] The valve opening degree = axial distance L2 between the limiting surface 203 of the valve body 200 and point Y of the valve port 202 - axial distance L1 between the end face of the gasket 103 near the valve needle 104 and point X of the valve needle 104 in its natural state. The axial distance between the end face of the valve stem 102 away from the gasket 103 and the end face of the gasket 103 near the valve needle 104 is L3, and the axial distance between the end face of the valve needle 104 away from the gasket 103 and the end face of the gasket 103 near the valve needle 104 is L4. L1 = L3 + L4.

[0035] Because the bellows 101 is a stamped and drawn part, its axial length has poor consistency, resulting in poor consistency of the aforementioned axial distance L1. Therefore, in the past, it was necessary to first assemble the valve needle assembly 100, then measure the axial distance L1, and then determine the aforementioned axial distance L2 of the valve body 200 based on the measured axial distance length L1. This required waiting for the valve needle assembly 100 to be assembled before processing the valve body 200, which affected production efficiency. Otherwise, the poor consistency of L1 would cause the valve opening to fail to meet the design requirements.

[0036] In this application, the end face of the valve stem 102 away from the gasket 103 is machined by turning and milling, resulting in better consistency of L3. Furthermore, the valve needle 104 is typically a machined part, inherently possessing good consistency. Additionally, the valve needle 104 is press-fitted onto the end of the valve stem 102 away from the gasket 103 and abuts against the end face of that end, thus ensuring good consistency of L4. Therefore, this application guarantees good consistency of length L1 (L1 = L3 + L4). Using this application, it is no longer necessary to wait for the valve needle assembly 100 to be assembled before machining the valve body 200; the machining of the valve body 200 and the assembly of the valve needle assembly 100 can be performed simultaneously, thus improving production efficiency and reducing the likelihood of the opening degree failing to meet design requirements.

[0037] Furthermore, this application also provides a method for processing a valve needle assembly. The method involves positioning an assembly, which includes a bellows 101, a valve stem 102, and a gasket 103 assembled together, and may also include a bushing 105. The end face of the gasket 103 near the valve needle 104 is used as the positioning reference surface. After positioning, the end face of the valve stem 102 away from the gasket 103 is milled until the distance L3 between the end face of the valve stem 102 away from the gasket 103 and the end face of the gasket 103 near the valve needle 104 equals a preset value. After processing, the assembly and the valve needle 104 are then assembled together.

[0038] Furthermore, this application also provides a processing apparatus 400 for implementing the above-described processing method. For example... Figure 3 The processing apparatus 400 includes a positioning assembly 401 for positioning the assembly and a milling assembly 402 for milling the end face of the valve stem 102 away from the gasket 103.

[0039] like Figure 3 The positioning assembly 401 includes a positioning base 4011, a positioning pressure head 4012, and a positioning clamp 4013, and also includes a positioning pressure head drive device (not shown in the figure) and a positioning clamp drive device (not shown in the figure). Additionally, it may include an elastic reset member (not shown in the figure).

[0040] The positioning seat 4011 and the positioning pressure head 4012 cooperate with the gasket 103 of the positioning assembly to fix the position of the gasket 103. The positioning clamp 4013 is used to clamp the valve stem 102 of the assembly to fix the position of the valve stem 102. The positioning clamp drive device is used to drive the positioning clamp 4013 to clamp the valve stem 102. The elastic reset member is used to drive the positioning clamp 4013 to reset after the driving force of the positioning clamp drive device is removed. Of course, the elastic reset member can also be omitted, and the positioning clamp drive device can be used to drive the positioning clamp 4013 to reset.

[0041] like Figure 3 The milling and turning assembly 402 includes a cutting tool 4021, a cutting tool drive motor 4022, and a feed motor (not shown in the figure). The cutting tool 4021 can be a milling cutter or a turning tool. The output shaft of the cutting tool drive motor 4022 is connected to the cutting tool 4021 and is used to drive the cutting tool 4021 to move in a direction parallel to the surface to be machined. The movement can be translation or rotation, and the movement trajectory can be a straight line or a curve. Specifically, the output shaft of the cutting tool drive motor 4022 can be connected to the cutting tool 4021 through a connecting sleeve 4023 to facilitate the replacement of different types of cutting tools 4021. The output shaft of the feed motor is connected to the body of the cutting tool drive motor 4022 through a transmission component and is used to drive the cutting tool 4021 and the cutting tool drive motor 4022 to feed along the axial direction of the valve stem 102. The transmission component can be a gear and rack component, a lead screw and nut component, or any component that can convert the rotational motion of the output shaft of the feed motor into linear motion.

[0042] like Figure 4 The positioning seat 4011 is provided with a through hole A and a positioning surface B. For example... Figure 5 The positioning fixture 4013 has multiple clamping parts 4013a, which are arranged sequentially in the circumferential direction of the valve stem 102. Figure 5 In the illustrated embodiment, four clamping parts 4013a are provided. In actual implementation, the number of clamping parts 4013a can be flexibly adjusted as needed, as long as there are no fewer than two. Figure 6 Each clamping part 4013a has a clamping surface H at one end. The clamping surface H is designed to fit tightly against the outer peripheral surface of the valve stem 102. When the outer peripheral surface of the valve stem 102 is cylindrical, the clamping surface H is designed as an arc-shaped surface. Figure 6 One end of the positioning head 4012 is provided with a pressure surface K.

[0043] like Figure 8Before machining, the assembly is inserted into the through hole A of the positioning seat 4011. Then, the positioning pressure head drive device is activated, which drives the positioning pressure head 4012 to move axially along the valve stem 102 until the pressing surface K of the positioning pressure head 4012 presses the gasket 103 against the positioning surface B of the positioning seat 4011, thus achieving the positioning of the gasket 103. Then, the positioning fixture drive device is activated, which drives each clamping part 4013a of the positioning fixture 4013 to move axially perpendicular to the valve stem 102 until the clamping surface H of each clamping part 4013a clamps the outer peripheral surface of the valve stem 102, thus achieving the positioning of the valve stem 102. After the positioning of the gasket 103 and the valve stem 102 is completed, the feed motor and the tool drive motor 4022 are activated to perform milling machining on the end face of the valve stem 102 away from the gasket 103. The feed amount of the feed motor is preset.

[0044] Specifically, such as Figure 4 The positioning base 4011 can be provided with multiple clamping part mounting holes C. One end of the clamping part mounting hole C communicates with the through hole A, and the other end of the clamping part mounting hole C forms an opening on the surface of the positioning base 4011. For example... Figure 5 Each clamping part 4013a of the positioning fixture 4013 is correspondingly installed in the clamping part mounting hole C and is guided and engaged with the clamping part mounting hole C, so as to move perpendicular to the axial direction of the valve stem 102 under the guidance of the clamping part mounting hole C. In this way, the positioning seat 4011 can support and guide each clamping part 4013a of the positioning fixture 4013 without the need for additional components to support and guide the clamping parts 4013a, which helps to simplify the structure of the processing device 400.

[0045] Specifically, such as Figure 4 The positioning seat 4011 may include a top seat 4011a and a base 4011b. Both the top seat 4011a and the base 4011b are provided with receiving holes. Figure 5 The diagram shows the connecting hole G on the base 4011b, through which fasteners connect the two components. In the connected state, the bottom surface of the top seat 4011a and the top surface of the base 4011b are in contact with each other. The bottom surface of the top seat 4011a has multiple top grooves C1, and the top surface of the base 4011b has multiple bottom grooves C2. When the bottom surfaces of the top seat 4011a and the top surfaces of the base 4011b are in contact, each top groove C1 corresponds to each bottom groove C2, forming multiple clamping part mounting holes C. This arrangement facilitates the assembly of the clamping part 4013a and the positioning seat 4011. Specifically, during assembly, the top seat 4011a and the base 4011b can be separated first, then the clamping part 4013a can be placed in the top groove C1 or the bottom groove C2, and then the top seat 4011a and the base 4011b can be joined together.

[0046] like Figure 4 When the positioning seat 4011 includes a top seat 4011a and a base 4011b, one part of the through hole A is formed in the top seat 4011a and the other part is formed in the base 4011b. Figure 4 In the illustrated embodiment, the portion of the top seat 4011a in which the through hole A is formed is provided with a first hole section A1, a second hole section A2, and a third hole section A3 sequentially from top to bottom. The first hole section A1 is a gradually expanding hole section from bottom to top, so that the assembly can be inserted into the through hole A by using the hole wall of the first hole section A1 as a guide. The diameter of the second hole section A2 is larger than the diameter of the third hole section A3. The body portion 101a of the bellows 101 is located inside the second hole section A2, and the riveted portion 101c of the bellows 101 extends into the third hole section A3.

[0047] like Figure 4 The top seat 4011a may be provided with a recessed portion E and a sleeve portion F. The recessed portion E forms an opening on the top surface of the top seat 4011a. The top end of the sleeve portion F protrudes from the bottom wall of the recessed portion E and extends into the enclosed space of the side wall of the recessed portion E. The top end face of the sleeve portion F forms the aforementioned positioning surface B, and the inner wall of the sleeve portion F participates in enclosing and forming the aforementioned through hole A. Figure 8 When the positioning head 4012 presses against the pad 103, the positioning head 4012 is at least partially located within the recess E. This type of top seat 4011a has high structural strength, small size, and can avoid the positioning head 4012, thus avoiding affecting the movement of the positioning head 4012.

[0048] like Figure 4 In this embodiment, the top seat 4011a is provided with a plurality of elastic reset member mounting holes D. One end of the elastic reset member is installed in the elastic reset member mounting hole D, and the other end is connected to the clamping part 4013a. Specifically, it can be as follows: Figure 7 A protrusion J is provided at the end of the clamping part 4013a away from the clamping surface H, so that the elastic reset member abuts against the protrusion J (see reference). Figure 7 (Understanding). When the driving force of the positioning clamp drive device is removed, the clamping part 4013a moves away from the valve stem 102 under the elastic force of the elastic reset member, thereby realizing the reset of the clamping part 4013a.

[0049] like Figure 6 The positioning pressure head 4012 has a recessed clearance hole 4012b at one end of its pressure surface K, which allows it to avoid the flanged portion 101b of the bellows 101. The pressure surface K surrounds the clearance hole 4012b and presses against the outer ring area of ​​the gasket 103. The end of the positioning pressure head 4012 away from the pressure surface K has a connecting hole 4012a for connecting to a positioning pressure head drive device. Specifically, the positioning pressure head drive device can be an electric device, a pneumatic device, or a hydraulic device, etc.

[0050] like Figure 7 The clamping part 4013a has a recessed top side at one end of the clamping surface H, forming an avoidance notch I. This notch I allows the riveting part 101c of the bellows 101 to be avoided, preventing the riveting part 101c of the bellows 101 from contacting the clamping part 4013a. The end of the clamping part 4013a away from the clamping surface H has a protrusion J, which can abut against the elastic reset member. A hole can also be provided on the protrusion J to connect to the positioning fixture drive device. Specifically, the positioning fixture drive device can be an electric device, a pneumatic device, or a hydraulic device, etc.

[0051] The above examples illustrate the principles and implementation methods of this application. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A method for processing a valve needle assembly, characterized in that, The valve needle assembly includes a bellows, a valve stem, and a gasket. The bellows is fitted around the valve stem, with one end connected to the gasket and the other end connected to the valve stem. The end of the valve stem away from the gasket extends out of the bellows, and the end face of the valve stem away from the gasket is a milled surface. The machining method is as follows: the assembly, which includes the bellows, valve stem, and gasket assembled together, is positioned using the end face of the gasket near the valve needle as a positioning reference surface. After positioning, the end face of the valve stem away from the gasket is milled until the distance between the end face of the valve stem away from the gasket and the end face of the gasket near the valve needle is equal to a preset value.

2. A valve needle assembly, characterized in that, The valve needle assembly includes a bellows, a valve stem, a gasket, and a valve needle. The bellows is fitted around the outer periphery of the valve stem. One end of the bellows is soldered to the gasket, and the other end is soldered to the valve stem. The end of the valve stem away from the gasket extends out of the bellows. The valve needle is press-fitted around the outer periphery of the end of the valve stem away from the gasket and abuts against the end face of the valve stem away from the gasket. The end face of the valve stem away from the gasket is a milled surface. The valve needle assembly is machined using the machining method described in claim 1.

3. The valve needle assembly according to claim 2, characterized in that, The bellows, valve stem, and gasket are made of copper or copper alloy, and the valve needle is made of stainless steel.

4. A valve device, comprising a valve needle assembly, a drive assembly, and a valve body, characterized in that, The valve needle assembly is the valve needle assembly as described in claim 2 or 3. The valve body is provided with a mounting cavity, one end of the mounting cavity is provided with a valve port, and the end of the mounting cavity away from the valve port is provided with a limiting surface. The valve needle assembly is mounted in the mounting cavity. The end face of the gasket of the valve needle assembly near the valve needle abuts against the limiting surface. The driving assembly pushes the valve stem, causing the valve stem to drive the valve needle to move in the direction of closing the valve port.

5. A processing apparatus for a valve needle assembly, used to implement the processing method described in claim 1, characterized in that, The processing apparatus includes: a positioning component for positioning the assembly and a milling component for milling the end face of the valve stem away from the gasket; The positioning component includes: A positioning seat, wherein the positioning seat is provided with a through hole and a positioning surface, and the assembly is inserted into the through hole; A positioning head and a positioning head driving device are provided. One end of the positioning head is provided with a pressing surface. The positioning head driving device drives the positioning head to move along the axial direction of the valve stem so that the pressing surface presses the gasket against the positioning surface of the positioning seat, thereby fixing the position of the gasket. A positioning fixture and a positioning fixture driving device are provided. The positioning fixture includes multiple clamping parts, each of which is arranged sequentially in the circumferential direction of the valve stem. One end of each clamping part is provided with a clamping surface. The positioning fixture driving device is used to drive the clamping part to move along an axial direction perpendicular to the valve stem so that the clamping surface clamps the outer circumferential surface of the valve stem, thereby fixing the position of the valve stem. The milling and turning assembly includes a cutting tool, a cutting tool drive motor, and a feed motor. The output shaft of the cutting tool drive motor is connected to the cutting tool and is used to drive the cutting tool to move in a direction parallel to the surface to be machined. The output shaft of the feed motor is connected to the body of the cutting tool drive motor through a transmission component and is used to drive the cutting tool and the cutting tool drive motor to feed along the axial direction of the valve stem.

6. The processing apparatus according to claim 5, characterized in that, The positioning seat is provided with a plurality of clamping part mounting holes. One end of each clamping part mounting hole communicates with the through hole, and the other end of each clamping part mounting hole forms an opening on the surface of the positioning seat. Each clamping part of the positioning fixture is installed in a corresponding manner in each clamping part mounting hole and is guided and engaged with the clamping part mounting hole so as to move along an axial direction perpendicular to the valve stem under the guidance of the clamping part mounting hole.

7. The processing apparatus according to claim 6, characterized in that, The positioning seat includes a top seat and a base, which are fixedly connected by fasteners. The bottom surface of the top seat and the bottom surface of the base fit together. The bottom surface of the top seat is provided with a top groove, and the top surface of the base is provided with a bottom groove. The top groove and the bottom groove are matched to form the mounting hole of the clamping part.

8. The processing apparatus according to claim 7, characterized in that, The top seat is provided with a recessed portion and a sleeve portion. The recessed portion forms an opening on the top surface of the top seat. The top end of the sleeve portion protrudes from the bottom wall of the recessed portion and extends into the enclosed space of the side wall of the recessed portion. The top end face of the sleeve portion forms the positioning surface. The inner wall of the sleeve portion participates in enclosing and forming the through hole.

9. The processing apparatus according to claim 5, characterized in that, The positioning pressure head has a recessed end of the pressure surface to form a relief hole, the pressure surface is arranged around the relief hole, the relief hole is used to avoid the end of the bellows connected to the gasket, and the pressure surface is used to press against the outer ring area of ​​the gasket.

10. The processing apparatus according to claim 5, characterized in that, The clamping part has a notch at one end near the valve stem, which is used to avoid the end of the bellows connected to the valve needle.

11. The processing apparatus according to claim 5, characterized in that, The positioning assembly further includes an elastic reset member, which is used to drive the clamping part to move away from the valve stem along an axial direction perpendicular to the valve stem, so as to reset the clamping part.

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