A fixing assembly for valve seat machining

Abstract

The application discloses a fixing assembly for valve seat machining and relates to the technical field of intelligent manufacturing equipment. In the process of machining and processing the valve seat by the fixing assembly through the plasma welding equipment, the first positioning assembly, the second positioning assembly, the driving assembly and other components are matched with each other, the multi-process welding machining of the valve seat, the valve rod and the flange and other components can be completed at one time, the valve seat does not need to be disassembled and repositioned, the accumulated error generated in the repeated clamping process is reduced, the machining efficiency of the valve body is ensured, the valve body and the valve rod body of the valve seat can be centrally positioned and processed synchronously and automatically during the fixing process, the valve seat does not need to be positioned and adjusted again, the purpose of quick fixing and automatic adjustment can be achieved, and the valve seat can be quickly fixed and efficiently machined.

Description

Technical Field

[0001] This invention relates to the field of intelligent manufacturing equipment technology, specifically to a fixing component for valve seat processing. Background Technology

[0002] In the production and processing of valve seats, the use of plasma welding equipment to connect valve seats with valve stems, flanges, and other components has become an important method for high-precision manufacturing. Plasma welding achieves high-quality welds with high-energy-density electric arcs, which can effectively ensure the connection strength and sealing performance of key parts of the valve seat. However, this process places stringent requirements on the fixing accuracy, clamping stability, and resistance to thermal deformation of the valve seat. It is necessary to ensure the precise relative positional dimensions of the valve stem hole, flange hole, and flange end face during the welding process (such as the perpendicularity of the valve stem hole to the flange face and the circumferential distribution accuracy of the flange hole) to avoid weld defects caused by welding misalignment.

[0003] Existing fixing components based on fixing grooves and fixing blocks can quickly clamp valve seats through cylinder drive, reducing positioning errors caused by repeated disassembly and assembly. However, they have significant limitations in plasma welding scenarios: plasma welding requires higher initial positioning accuracy for valve seats, and the existing fixing components involve cumbersome calibration and adjustment processes, which are prone to welding position deviations due to human operation errors, affecting weld quality. Therefore, we propose a fixing component for valve seat processing. Summary of the Invention

[0004] The purpose of this invention is to provide a fixing component for valve seat machining, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fixing assembly for valve seat processing, comprising a first mounting base and a second mounting base for clamping and fixing the valve seat during plasma welding. The first mounting base and the second mounting base are detachably mounted on the inner side of the plasma welding equipment. The valve seat is disposed between the first mounting base and the second mounting base. The valve seat includes a valve body and a valve stem fixed to the outside of the valve body. The front and rear ends of the valve body are provided with end faces for installation and positioning. The end of the valve stem is provided with a flange for auxiliary connection. A first positioning plate for abutting and positioning against the end face of the valve body is fixedly connected to the first mounting base by multiple sets of fixing rods. A second positioning plate for abutting and pressing against the other end face of the valve body is provided on one side of the second mounting base. A telescopic component for telescopically driving the second positioning plate is provided on the second mounting base. The assembly further includes:

[0006] The first positioning component is disposed on the first positioning plate and is used to center and position the valve body during the valve seat fixing process;

[0007] The second positioning component is set on the first positioning plate for centering the valve stem body during the valve seat fixing process. A drive component for driving the second positioning component is set on the outside of the first positioning plate.

[0008] In addition, a first transmission component disposed on the first positioning plate for driving the first positioning component during the valve seat fixing process, and a second transmission component for driving the drive component.

[0009] Preferably, the first positioning component includes multiple sets of strip plates, and the multiple sets of strip plates are arranged in a circular array on the front side of the first positioning disk. A connecting component for auxiliary guiding connection is provided between the first positioning disk and the strip plates. An arc plate is connected to the strip plate by an elastic component. One side of the arc plate is rotatably connected by multiple sets of spherical grooves to a ball bearing for pressing against the inner wall of the valve body.

[0010] Preferably, the elastic component includes multiple sets of T-shaped rods slidably connected to the strip plate, one end of each T-shaped rod being fixed to the arc plate, and a first spring being sleeved on the outer side of each T-shaped rod, with both ends of the first spring being connected to the strip plate and the arc plate respectively.

[0011] Preferably, the connecting assembly includes a mounting cavity formed on the first positioning plate, a disc is telescopically connected to the mounting cavity via a telescopic assembly, and one side of the disc protrudes out of the outer side of the mounting cavity. The disc has multiple sets of sliding grooves, and a connecting plate is provided inside each set of sliding grooves. Multiple sets of guide rods are slidably connected to the connecting plate, and the guide rods are fixed inside the sliding grooves. Each set of connecting plates is fixed to each set of strip plates.

[0012] Preferably, the first transmission assembly includes a first transmission plate fixed inside the mounting cavity, the first transmission plate having a first inclined groove, a first transmission pin slidably connected to the first inclined groove, and the first transmission pin being fixed to the connecting plate.

[0013] Preferably, the telescopic assembly is provided in multiple sets, and the multiple sets of telescopic assemblies are arranged in a ring array inside the mounting cavity. The telescopic assembly includes a sleeve fixed inside the mounting cavity, a sliding rod slidably connected to the sleeve, one end of the sliding rod being fixed to a disc, and a second spring sleeved on the outside of the sleeve, with the two ends of the second spring abutting against the inner wall of the mounting cavity and the disc, respectively.

[0014] Preferably, the second positioning component includes an L-shaped frame fixed on the first positioning plate, a fixed shaft fixed on the L-shaped frame, and two sets of staggered and symmetrically arranged flip plates rotatably connected to the fixed shaft. The flip plates are fixed with extrusion rollers for pressing against the outer side of the valve stem body.

[0015] Preferably, the drive assembly includes gear rings fixed to the flip plate, two sets of gear rings are concentrically arranged with the fixed shaft, a base plate is provided on the outer side of the first positioning plate, and two sets of racks are fixed on the base plate, which are respectively meshed with the two sets of gear rings, and the two sets of racks are respectively located on both sides of the fixed shaft.

[0016] Preferably, the second transmission assembly includes multiple sets of transmission rods slidably connected to the first positioning plate, a second transmission plate is provided inside the mounting cavity, the two ends of the transmission rods are fixed to the base plate and the second transmission plate respectively, a second inclined groove is provided on the second transmission plate, a mounting plate is fixed on the disc, a second transmission pin is fixed on the mounting plate, and the second transmission pin is slidably connected to the second inclined groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention utilizes plasma welding equipment to process valve seats through a fixing assembly. The cooperation of components such as the first positioning assembly, the second positioning assembly, and the drive assembly allows for the completion of multiple welding processes between the valve seat, valve stem, flange, and other components in a single clamping operation. This eliminates the need for disassembly and repositioning, reducing cumulative errors from repeated clamping and ensuring efficient valve body processing. Furthermore, during the fixing process, the valve seat and valve stem are simultaneously and automatically centered, eliminating the need for re-calibration and adjustment of the valve seat position. This enables rapid fixing and automatic adjustment, facilitating quick valve seat fixation and efficient machining. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall external structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the valve seat structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the second mounting base and the second positioning plate of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the first positioning disk and the first positioning component of the present invention;

[0023] Figure 5 This is a schematic diagram of the second positioning disk and telescopic component structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the second transmission component structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of the first positioning component, elastic component, connecting component, and first transmission component of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the second positioning component and the driving component of the present invention;

[0027] Figure 9 This is a schematic diagram of the state after the first and second positioning discs of the present invention abut against the two end faces of the valve body.

[0028] Figure 10 This is a schematic diagram of the positioning transmission state of the first positioning component and the second positioning component of the present invention;

[0029] Figure 11 This is a schematic diagram of the transmission direction of the first transmission component and the second transmission component of the present invention;

[0030] Figure 12 This is a schematic diagram showing the force and motion direction of each group of arc-shaped plates in this invention;

[0031] Figure 13 This is a schematic diagram showing the direction of force movement of the flip plate according to the present invention.

[0032] In the diagram: 101, First mounting base; 102, First positioning plate; 103, Fixing rod; 104, Second mounting base; 105, Second positioning plate; 106, Telescopic component; 201, Valve body; 202, Valve stem body; 203, Flange; 301, Strip plate; 302, Arc plate; 303, Spherical groove; 304, Ball bearing; 401, T-shaped rod; 402, First spring; 501, Mounting cavity; 502, Disc; 503, Slide groove; 504, Guide rod; 5 05. Connecting plate; 601. Sleeve; 602. Slide rod; 603. Second spring; 701. First transmission plate; 702. First inclined groove; 703. First transmission pin; 801. L-shaped frame; 802. Fixed shaft; 803. Tilting plate; 804. Extrusion roller; 901. Gear ring; 902. Base plate; 903. Rack; 1001. Transmission rod; 1002. Second transmission plate; 1003. Second inclined groove; 1004. Mounting plate; 1005. Second transmission pin. Detailed Implementation

[0033] 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, and 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.

[0034] Example 1

[0035] Please see Figures 1-13The figure shows a fixing assembly for valve seat processing, including a first mounting base 101 and a second mounting base 104 for clamping and fixing the valve seat during plasma welding. The first mounting base 101 and the second mounting base 104 are detachably installed on the inside of the plasma welding equipment. The valve seat is disposed between the first mounting base 101 and the second mounting base 104. The valve seat includes a valve body 201 and a valve stem body 202 fixed to the outside of the valve body 201. The front and rear ends of the valve body 201 are provided with end faces for installation and positioning. The end of the valve stem body 202 is provided with a flange 203 for auxiliary connection. The first mounting base 101 is fixedly connected to a first positioning plate 102 for positioning against the end face of the valve body 201 by multiple sets of fixing rods 103. One side of the second mounting base 104 is provided with a second positioning plate 105 for pressing against the other end face of the valve body 201. The second mounting base 104 is provided with a telescopic component 106 for telescopically driving the second positioning plate 105.

[0036] It should be noted here that the plasma welding equipment is internally equipped with a component that performs multiple welding processes for valve seats, valve stems, flanges, and other parts. This component and the plasma welding equipment are conventional technical means in the technical field of this application, and their working principle and operation method will not be described in detail here.

[0037] In addition, the telescopic component 106 is a conventional driving component, and it is considered prior art in this application. Its working principle and operation method will not be described in detail here.

[0038] Also includes:

[0039] The first positioning component is disposed on the first positioning disk 102 for centering the valve body 201 during the valve seat fixing process;

[0040] The second positioning component is disposed on the first positioning disk 102 for centering the valve stem body 202 during the valve seat fixing process. A drive component for driving the second positioning component is disposed on the outside of the first positioning disk 102.

[0041] In addition, a first transmission component and a second transmission component are provided on the first positioning plate 102 for transmitting power to the first positioning component during the valve seat fixing process.

[0042] It should be noted that during the processing of the valve seat by the plasma welding equipment through the fixing components, the cooperation of the first positioning component, the second positioning component, the drive component, and other components enables the completion of multiple welding processes of the valve seat, valve stem, flange, and other components in a single clamping, without the need for disassembly and repositioning. This reduces the cumulative error generated during repeated clamping, ensuring the efficiency of processing the valve body 201. Furthermore, during the fixing process, the valve body 201 and valve stem 202 of the valve seat can be simultaneously and automatically centered, eliminating the need for re-calibration and adjustment of the valve seat position. This achieves the purpose of rapid fixing and automatic adjustment, facilitating the rapid fixing and efficient machining of the valve seat.

[0043] Preferably, the first positioning component includes multiple sets of strip plates 301, and the multiple sets of strip plates 301 are arranged in a circular array on the front side of the first positioning disk 102. A connecting component for auxiliary guiding connection is provided between the first positioning disk 102 and the strip plates 301. An arc plate 302 is connected to the strip plate 301 through an elastic component. One side of the arc plate 302 is rotatably connected to a ball 304 for pressing against the inner wall of the valve body 201 through multiple sets of spherical grooves 303.

[0044] It should be noted that: through transmission, the balls 304 inside the spherical grooves 303 on the arc plate 302 abut against the inner wall of the valve body 201. Through the abutting action of the balls 304 on the arc plate 302 against the inner wall of the valve body 201, the valve body 201 is centered and positioned. During the abutting and positioning process, through the rotation of the balls 304 inside the spherical grooves 303, the valve body 201 after being centered and positioned can still be swung around the axial direction for adjustment, which facilitates the subsequent positioning operation of the valve stem 202.

[0045] Preferably, the elastic component includes multiple sets of T-shaped rods 401 slidably connected to the strip plate 301. One end of the T-shaped rod 401 is fixed to the arc plate 302. A first spring 402 is sleeved on the outside of the T-shaped rod 401. The two ends of the first spring 402 are respectively connected to the strip plate 301 and the arc plate 302.

[0046] It should be noted here that: through transmission, each set of strip plates 301 is driven to move toward the inside of the valve body 201. During the movement of the strip plates 301, through the connection of the T-shaped rod 401 and the first spring 402, the arc plate 302 is driven to move and each set of balls 304 abuts against the inside of the valve body 201. After the balls 304 abut against the inside of the valve body 201, through the continued movement of the strip plates 301, the first spring 402 is deformed by force to generate elastic force. Through the elastic force of the first spring 402, the effect of the balls 304 on one side of the arc plate 302 abutting against the inner wall of the valve body 201 is ensured.

[0047] Preferably, the connecting assembly includes a mounting cavity 501 formed on the first positioning plate 102. A disc 502 is telescopically connected to the mounting cavity 501 via a telescopic assembly, and one side of the disc 502 protrudes from the outside of the mounting cavity 501. Multiple sets of sliding grooves 503 are formed on the disc 502. A connecting plate 505 is provided inside each set of sliding grooves 503. Multiple sets of guide rods 504 are slidably connected to the connecting plate 505. The guide rods 504 are fixed inside the sliding grooves 503. Each set of connecting plates 505 is fixed to each set of strip plates 301.

[0048] It should be noted that during the process of fixing the valve body 201, as the disc 502 is pushed toward the first positioning disc 102, the connecting plate 505 and the first transmission pin 703 on the connecting plate 505 move synchronously through the connection of the guide rods 504 in each set of slide grooves 503. During the movement of the connecting plate 505 and the first transmission pin 703, the interaction between the first transmission pin 703 and the first inclined groove 702 on the first transmission plate 701 causes the connecting plate 505 to move toward the inside of the mounting cavity 501 while moving toward the periphery of the disc 502 inside the slide groove 503. During the movement of the connecting plate 505, the connecting action of the strip plate 301 and the elastic component causes each set of arc plates 302 to move away from each other inside the valve body 201.

[0049] Preferably, the first transmission assembly includes a first transmission plate 701 fixed inside the mounting cavity 501, a first inclined groove 702 is provided on the first transmission plate 701, a first transmission pin 703 is slidably connected to the first inclined groove 702, and the first transmission pin 703 is fixed on the connecting plate 505.

[0050] It should be noted that as the disc 502 is pushed toward the first positioning disc 102, the connecting plate 505 and the first transmission pin 703 on the connecting plate 505 move synchronously through the connection of the guide rods 504 in each set of slide grooves 503. During the movement of the connecting plate 505 and the first transmission pin 703, through the interaction between the first transmission pin 703 and the first inclined groove 702 on the first transmission plate 701, the connecting plate 505 moves toward the inside of the mounting cavity 501 while simultaneously moving toward the periphery of the disc 502 inside the slide groove 503.

[0051] Preferably, multiple sets of telescopic components are provided, and the multiple sets of telescopic components are arranged in a ring array inside the mounting cavity 501. The telescopic component includes a sleeve 601 fixed inside the mounting cavity 501, a slide rod 602 slidably connected to the sleeve 601, one end of the slide rod 602 being fixed to the disc 502, and a second spring 603 being sleeved on the outside of the sleeve 601. The two ends of the second spring 603 are respectively abutted against the inner wall of the mounting cavity 501 and the disc 502.

[0052] It should be noted that the sleeve 601 and the slide rod 602 facilitate the telescopic connection of the disc 502, and the second spring 603 facilitates the reset of the disc 502 after the retraction movement.

[0053] Preferably, the second positioning component includes an L-shaped frame 801 fixed on the first positioning disk 102, a fixed shaft 802 fixed on the L-shaped frame 801, and two sets of staggered and symmetrically arranged flip plates 803 rotatably connected to the fixed shaft 802. The flip plates 803 are fixed with a pressing roller 804 for pressing against the outside of the valve stem body 202.

[0054] It should be noted here that: during the process of the disc 502 moving toward the interior of the mounting cavity 501, through transmission, the two sets of flipping plates 803 are driven to rotate toward the outside of the valve stem body 202 with the fixed shaft 802 as the center. During the movement, the two sets of extrusion rollers 804 respectively abut against the outside of the valve stem body 202 to push and position the valve stem body 202.

[0055] Additionally, it is worth noting that the extrusion roller 804 is supported by fiber-reinforced plastic, which has a certain degree of hardness and can deform during high-pressure extrusion. By setting the hardness of the extrusion roller 804, effective extrusion of the valve stem body 202 is ensured, and adaptive extrusion can be achieved through deformation.

[0056] Preferably, the drive assembly includes a gear ring 901 fixed on the flip plate 803, two sets of gear rings 901 are concentrically arranged with the fixed shaft 802, a base plate 902 is provided on the outer side of the first positioning plate 102, and two sets of racks 903 are fixed on the base plate 902, which are respectively meshed with the two sets of gear rings 901, and the two sets of racks 903 are respectively located on both sides of the fixed shaft 802;

[0057] It should be noted here that: during the movement of the disc 502 toward the interior of the mounting cavity 501, the base plate 902 is driven to move through the transmission. During the movement of the base plate 902, since the two sets of racks 903 are located on both sides of the fixed shaft 802, the two sets of racks 903 are driven to rotate around the fixed shaft 802 toward the outside of the valve stem body 202 through the mutual meshing of the two sets of racks 903 and the two sets of gear rings 901.

[0058] Preferably, the second transmission assembly includes multiple sets of transmission rods 1001 slidably connected to the first positioning disk 102, a second transmission plate 1002 is provided inside the mounting cavity 501, the two ends of the transmission rods 1001 are respectively fixed to the bottom plate 902 and the second transmission plate 1002, a second inclined groove 1003 is provided on the second transmission plate 1002, a mounting plate 1004 is fixed on the disk 502, a second transmission pin 1005 is fixed on the mounting plate 1004, and the second transmission pin 1005 is slidably connected to the second inclined groove 1003;

[0059] It should be noted that as the disc 502 moves toward the interior of the mounting cavity 501, it drives the mounting plate 1004 to move synchronously. During the movement of the mounting plate 1004, the interaction between the second transmission pin 1005 and the second inclined groove 1003 on the second transmission plate 1002 drives the second transmission plate 1002 and each set of transmission rods 1001 on the second transmission plate 1002 to move toward the outside of the first positioning disc 102. The movement of each set of transmission rods 1001 pushes the base plate 902 to move.

[0060] In this solution: a fixing component for valve seat machining includes the following steps:

[0061] During the processing of the valve seat by plasma welding equipment, the valve body 201 is fixed inside the equipment. During the fixing process, the valve body 201 of the valve seat is placed facing the first positioning plate 102. During the placement process, the disc 502 abuts against the end face of the valve body 201. Through the abutting action between the disc 502 and the end face of the valve body 201 and the connecting support action of the telescopic component, the placed valve seat is supported. During the placement process, each set of arc plates 302 is placed inside the valve body 201, and during the support placement process, the entire valve seat is placed between the first positioning plate 102 and the second positioning plate 105.

[0062] After the valve seat is placed, the telescopic component 106 drives the second positioning disk 105 to move toward the valve body 201. During the movement, the second positioning disk 105 abuts against the other end face of the valve body 201. During this abutment, the continued movement of the second positioning disk 105 pushes the valve seat and the disk 502 abutting against the valve body 201 toward the first positioning disk 102, ultimately causing the end face of the valve body 201 to abut against the first positioning disk 102 (see...). Figure 9(in the state of the valve body 201), the valve seat is fixed by the abutting action of the first positioning plate 102 and the second positioning plate 105 against the two end faces of the valve body 201 respectively. During the fixing process, the valve seat is fixed by the abutting and pressing of the two end faces, so that the valve seat and valve stem, flange and other components can be welded in one clamping, without the need for disassembly and repositioning, reducing the cumulative error generated during repeated clamping and ensuring the efficiency of valve body 201 processing;

[0063] During the process of fixing the valve body 201, as the disc 502 is pushed towards the first positioning disc 102, the connecting plate 505 and the first transmission pin 703 on the connecting plate 505 move synchronously through the connection of the guide rods 504 in each set of slide grooves 503. During the movement of the connecting plate 505 and the first transmission pin 703, through the interaction between the first transmission pin 703 and the first inclined groove 702 on the first transmission plate 701, the connecting plate 505 moves towards the interior of the mounting cavity 501 while simultaneously moving towards the periphery of the disc 502 inside the slide groove 503 (i.e., each set of connecting plates 505 moves away from each other under force). During the movement of the connecting plate 505, through the connection of the strip plate 301 and the elastic component, the arc plates 302 move away from each other inside the valve body 201 (see...). Figure 12 In the state of motion, the balls 304 inside the spherical grooves 303 on the arc plate 302 abut against the inner wall of the valve body 201. Through the abutment action between the balls 304 on the arc plate 302 and the inner wall of the valve body 201, the valve body 201 is centered and positioned. During the abutment positioning process, the rotation of each set of balls 304 inside the spherical grooves 303 allows the centered valve body 201 to still be adjusted by swinging around the axial direction, facilitating the subsequent positioning operation of the valve stem 202. As the disc 502 moves toward the mounting cavity 501, it drives the mounting plate 1004 to move synchronously. During the movement of 004, the interaction between the second transmission pin 1005 and the second inclined groove 1003 on the second transmission plate 1002 drives the second transmission plate 1002 and each set of transmission rods 1001 on the second transmission plate 1002 to move towards the outside of the first positioning plate 102. The movement of each set of transmission rods 1001 pushes the base plate 902 to move. During the movement of the base plate 902, because the two sets of racks 903 are located on both sides of the fixed shaft 802, the meshing transmission between the two sets of racks 903 and the two sets of gear rings 901 drives the two sets of flipping plates 803 to rotate outwards from the fixed shaft 802 (see [reference]). Figure 13In the state of motion, the two sets of extrusion rollers 804 abut against the outer side of the valve stem body 202 respectively, pushing and positioning the valve stem body 202. Therefore, during the process of fixing the valve seat by the fixing component, the valve body 201 and valve stem body 202 of the valve seat can be centered and positioned synchronously and automatically. There is no need to recalibrate and adjust the position of the valve seat. This can achieve the purpose of fast fixing and automatic adjustment, which facilitates the fast fixing and efficient machining of the valve seat.

[0064] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0065] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fixing assembly for valve seat machining, comprising: A first mounting base and a second mounting base are used to clamp and fix a valve seat during plasma welding. The first mounting base and the second mounting base are detachably installed on the inside of the plasma welding equipment. The valve seat is disposed between the first mounting base and the second mounting base. The valve seat includes a valve body and a valve stem fixed to the outside of the valve body. The front and rear ends of the valve body are provided with end faces for installation and positioning. The end of the valve stem is provided with a flange for auxiliary connection. A first positioning plate for abutting and positioning against the end face of the valve body is fixedly connected to the first mounting base by multiple sets of fixing rods. A second positioning plate for abutting and pressing against the other end face of the valve body is provided on one side of the second mounting base. A telescopic component for telescopically driving the second positioning plate is provided on the second mounting base. Its characteristic is that it further includes: The first positioning component is disposed on the first positioning plate and is used to center and position the valve body during the valve seat fixing process; The second positioning component is set on the first positioning plate for centering the valve stem body during the valve seat fixing process. A drive component for driving the second positioning component is set on the outside of the first positioning plate. In addition, a first transmission component disposed on the first positioning plate for transmitting power to the first positioning component during the valve seat fixing process, and a second transmission component for transmitting power to the drive component; The first positioning component includes multiple sets of strip plates, and the multiple sets of strip plates are arranged in a circular array on the front side of the first positioning disk. A connecting component for auxiliary guiding connection is provided between the first positioning disk and the strip plates. An arc plate is connected to the strip plate by an elastic component. One side of the arc plate is rotatably connected by multiple sets of spherical grooves to a ball for pressing against the inner wall of the valve body. The connecting assembly includes a mounting cavity formed on the first positioning plate. A disc is telescopically connected to the mounting cavity via a telescopic assembly, and one side of the disc protrudes out of the outer side of the mounting cavity. Multiple sets of sliding grooves are formed on the disc. A connecting plate is provided inside each set of sliding grooves. Multiple sets of guide rods are slidably connected to the connecting plate. The guide rods are fixed inside the sliding grooves. Each set of connecting plates is fixed to each set of strip plates. The first transmission assembly includes a first transmission plate fixed inside the mounting cavity, a first inclined groove is provided on the first transmission plate, a first transmission pin is slidably connected to the first inclined groove, and the first transmission pin is fixed to the connecting plate. The second positioning component includes an L-shaped frame fixed on the first positioning plate, a fixed shaft fixed on the L-shaped frame, and two sets of staggered and symmetrically arranged flip plates rotatably connected to the fixed shaft. The flip plates are fixed with extrusion rollers for pressing against the outside of the valve stem body. The drive assembly includes a gear ring fixed to the flip plate. The two sets of gear rings are concentrically arranged with the fixed shaft. A base plate is provided on the outer side of the first positioning plate. Two sets of racks are fixed on the base plate and mesh with the two sets of gear rings respectively. The two sets of racks are located on both sides of the fixed shaft. The second transmission assembly includes multiple sets of transmission rods slidably connected to the first positioning plate. A second transmission plate is provided inside the mounting cavity. The two ends of the transmission rods are fixed to the base plate and the second transmission plate, respectively. A second inclined groove is provided on the second transmission plate. A mounting plate is fixed on the disc. A second transmission pin is fixed on the mounting plate. The second transmission pin is slidably connected to the second inclined groove.

2. The fixing assembly for valve seat machining according to claim 1, characterized in that: The elastic component includes multiple sets of T-shaped rods slidably connected to the strip plate. One end of each T-shaped rod is fixed to the arc plate. A first spring is sleeved on the outside of each T-shaped rod, and the two ends of the first spring are respectively connected to the strip plate and the arc plate.

3. A fixing assembly for valve seat machining according to claim 2, characterized in that: The telescopic assembly is provided in multiple sets, and the multiple sets of telescopic assemblies are arranged in a ring array inside the mounting cavity. The telescopic assembly includes a sleeve fixed inside the mounting cavity, a sliding rod slidably connected to the sleeve, one end of the sliding rod being fixed to a disc, and a second spring being sleeved on the outside of the sleeve. The two ends of the second spring are respectively abutted against the inner wall of the mounting cavity and the disc.

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