Fixing assembly for valve seat machining

Abstract

The invention discloses a fixing assembly for valve seat machining, and relates to the technical field of intelligent manufacturing equipment. In the process that plasma welding equipment is used for machining the valve seat through the fixing assembly, the first positioning assembly, the second positioning assembly, the driving assembly and other components are matched with one another, multi-procedure welding machining of the valve seat, a valve rod, a flange and other components can be completed through one-time clamping, repositioning after disassembly is not needed, and the machining efficiency is improved. Accumulated errors generated in the repeated clamping process are reduced, the machining efficiency of the valve body is guaranteed, in the fixing process, the valve body and the valve rod body of the valve seat can be centered and positioned synchronously and automatically, position calibration and adjustment do not need to be conducted on the valve seat again, the purposes of rapid fixing and automatic adjustment can be achieved, and the machining efficiency of the valve seat is improved. And rapid fixing and efficient machining treatment of the valve seat are facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent manufacturing equipment, in particular to a fixing assembly for valve seat machining. BACKGROUND

[0002] In the production and machining process of the valve seat, the connection and machining of the valve seat with the valve rod, flange and other components by using the plasma welding equipment has become an important way for high-precision manufacturing. The plasma welding realizes high-quality welding seam by means of high-energy-density arc, which can effectively ensure the connection strength and sealing performance of the key parts of the valve seat. However, this process puts forward strict requirements on the fixing accuracy, clamping stability and anti-thermal deformation ability of the valve seat, and needs to ensure the accurate relative position size of the valve rod hole, flange hole and flange end face (such as the perpendicularity of the valve rod hole and the flange face, the circular distribution accuracy of the flange hole) during the welding process, so as to avoid the welding defects caused by the welding deviation.

[0003] The existing fixing assembly based on the fixing groove and the fixing block can realize the quick clamping of the valve seat by the driving of the air cylinder, and reduce the positioning error caused by repeated disassembly and assembly. However, in the plasma welding scene, there are obvious limitations: the initial positioning accuracy of the valve seat is higher in the plasma welding, and the calibration and adjustment process in the fixing process of the existing fixing assembly is complicated, which is easy to cause the welding position deviation due to the manual operation error, and affects the welding seam quality. Therefore, we propose a fixing assembly for valve seat machining. SUMMARY

[0004] The purpose of the present application is to provide a fixing assembly for valve seat machining to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a fixing assembly for valve seat machining, comprising a first mounting seat and a second mounting seat for clamping and fixing the valve seat in the plasma welding process, the first mounting seat and the second mounting seat can be detachably mounted on the inner side of the plasma welding equipment, the valve seat is arranged between the first mounting seat and the second mounting seat, the valve seat comprises a valve body and a valve rod body fixed to the outer side 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 rod body is provided with a flange plate for auxiliary connection, a first positioning disc for positioning against the end face of the valve body is fixedly connected to the first mounting seat by a plurality of fixing rods, a second positioning disc for extruding against the other end face of the valve body is arranged on one side of the second mounting seat, and an extension component for driving the second positioning disc to extend and retract is arranged on the second mounting seat, further comprising: A first positioning assembly is arranged on the first positioning disc for center positioning of the valve body during the valve seat fixing process. A second positioning assembly is arranged on the first positioning disc for centering the valve stem during the valve seat fixing process, and a driving assembly is arranged outside the first positioning disc for driving the second positioning assembly; A first transmission assembly for driving the first positioning assembly and a second transmission assembly for driving the driving assembly are arranged on the first positioning disc.

[0006] Preferably, the first positioning assembly comprises a plurality of strip plates arranged in a ring array on the front side of the first positioning disc, a connecting assembly is arranged between the first positioning disc and the strip plates for auxiliary guiding connection, an arc-shaped plate is connected to the strip plate through an elastic assembly, and a rolling ball for abutting and pressing against the inner wall of the valve body is rotatably connected to one side of the arc-shaped plate through a plurality of spherical grooves.

[0007] Preferably, the elastic assembly comprises a plurality of T-shaped rods slidingly connected to the strip plate, one end of the T-shaped rod is fixed to the arc-shaped plate, a first spring is sleeved on the outer side of the T-shaped rod, and both ends of the first spring are connected to the strip plate and the arc-shaped plate, respectively.

[0008] Preferably, the connecting assembly comprises a mounting cavity opened on the first positioning disc, a disc is telescopically connected to the mounting cavity through a telescopic assembly, one side of the disc protrudes outward from the mounting cavity, a plurality of sliding grooves are opened on the disc, a connecting plate is arranged in each sliding groove, a plurality of guide rods are slidingly connected to the connecting plate, the guide rods are fixed in the sliding grooves, and each connecting plate is fixed to each strip plate.

[0009] Preferably, the first transmission assembly comprises a first transmission plate fixed in the mounting cavity, a first inclined groove is opened on the first transmission plate, a first transmission pin is slidingly connected to the first inclined groove, and the first transmission pin is fixed to the connecting plate.

[0010] Preferably, a plurality of telescopic assemblies are arranged in a ring array inside the mounting cavity, the telescopic assembly comprises a sleeve fixed in the mounting cavity, a sliding rod is slidingly connected to the sleeve, one end of the sliding rod is fixed to the disc, a second spring is sleeved on the outer side of the sleeve, and both ends of the second spring are arranged in abutment with the inner wall of the mounting cavity and the disc, respectively.

[0011] Preferably, the second positioning assembly comprises an L-shaped bracket fixed to the first positioning disc, a fixed shaft is fixed to the L-shaped bracket, two sets of flip plates arranged in a staggered manner and symmetrically are rotatably connected to the fixed shaft, and a pressing roller for abutting and pressing against the outer side of the valve stem is fixed to the flip plate.

[0012] Preferably, the driving assembly comprises a gear ring fixed on the turnover plate, two groups of the gear rings are arranged concentrically with the fixed shaft, the outer side of the first positioning disc is provided with a bottom plate, two groups of gear racks arranged in mesh with the two groups of gear rings are fixed on the bottom plate, and the two groups of gear racks are located on the two sides of the fixed shaft respectively.

[0013] Preferably, the second transmission assembly comprises a plurality of transmission rods slidably connected to the first positioning disc, the inside of the mounting cavity is provided with a second transmission plate, the two ends of the transmission rod are fixed with the bottom plate and the second transmission plate respectively, the second transmission plate is provided with a second inclined groove, the disc is fixed with a mounting plate, the mounting plate is fixed with a second transmission pin, and the second transmission pin is slidably connected to the second inclined groove.

[0014] Compared with the prior art, the beneficial effects of the present application are: In the process of using the plasma welding equipment to process the valve seat through the fixing assembly, the first positioning assembly, the second positioning assembly, the driving assembly and other components cooperate with each other, so that the valve seat, the valve rod and the flange and other components can be welded and processed in multiple processes through one clamping, without the need of disassembling and repositioning, thereby reducing the cumulative error generated in the repeated clamping process, ensuring the efficiency of the valve body processing, and synchronously and automatically positioning the valve body and the valve rod body during the fixing process, without the need of repositioning and adjusting the valve seat, so that the purpose of rapid fixing and automatic adjustment can be achieved, and the valve seat can be rapidly fixed and efficiently machined. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic view of the overall shape structure of the present application; Figure 2 It is a schematic view of the valve seat structure of the present application; Figure 3 It is a schematic view of the second mounting seat and the second positioning disc structure of the present application; Figure 4 It is a schematic view of the first positioning disc and the first positioning assembly structure of the present application; Figure 5 It is a schematic view of the second positioning disc and the telescopic assembly structure of the present application; Figure 6 It is a schematic view of the second transmission assembly structure of the present application; Figure 7 It is a schematic view of the first positioning assembly, the elastic assembly, the connecting assembly and the first transmission assembly structure of the present application; Figure 8 It is a schematic view of the second positioning assembly and the driving assembly structure of the present application; Figure 9 It is a schematic view of the state after the first positioning disc and the second positioning disc abut against the two side end faces of the valve body. Figure 10 This is a schematic diagram of the first positioning assembly and the second positioning assembly of the present invention after positioning and transmission; Figure 11 Schematic diagram of the transmission direction of the first transmission assembly and the second transmission assembly of the present invention; Figure 12 Schematic diagram of the force movement direction of each group of curved plates of the present invention; Figure 13 It is a schematic diagram of the force movement direction of the flip plate of the present invention.

[0016] In the figure: 101, first mounting seat; 102, first positioning plate; 103, fixing rod; 104, second mounting seat; 105, second positioning plate; 106, telescopic member; 201, valve body; 202, valve stem body; 203, flange; 301, strip plate; 302, arc plate; 303, spherical groove; 304, ball; 401, T-bar; 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 slot; 703, first transmission pin; 801, L-shaped frame; 802, fixed shaft; 803, flip plate; 804, extrusion roller; 901, ring gear; 902, bottom plate; 903, rack; 1001, transmission rod; 1002, second transmission plate; 1003, second inclined slot; 1004, mounting plate; 1005, second transmission pin. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] Example 1 See also Figures 1-13, one of the fixed assemblies for valve seat machining in the drawings, including the first mounting seat 101 and the second mounting seat 104 used for clamping and fixing the valve seat in the plasma welding process, the first mounting seat 101 and the second mounting seat 104 can be detachably mounted on the inside of the plasma welding equipment, the valve seat is arranged between the first mounting seat 101 and the second mounting seat 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 plate 203 for auxiliary connection, a plurality of groups of fixed rods 103 are fixedly connected on the first mounting seat 101, and a first positioning disc 102 for positioning against the end face of the valve body 201 is arranged, one side of the second mounting seat 104 is provided with a second positioning disc 105 for pressing against the other side end face of the valve body 201, and a telescopic component 106 for telescopic driving of the second positioning disc 105 is arranged on the second mounting seat 104; It should be noted that: the inside of the plasma welding equipment is provided with a component for multi-process welding of valve seat, valve stem, flange and other components, the component and the plasma welding equipment are conventional technical means in the technical field of the application, and the working principle and operation mode are not described in detail here; In addition, the telescopic component 106 is a conventional driving component, and its working principle and operation mode are not described in detail here as prior art; It also includes: A first positioning assembly arranged on the first positioning disc 102 for center positioning of the valve body 201 during valve seat fixing; A second positioning assembly arranged on the first positioning disc 102 for center positioning of the valve stem body 202 during valve seat fixing, a driving assembly arranged on the outside of the first positioning disc 102 for driving the second positioning assembly; And a first transmission assembly arranged on the first positioning disc 102 for transmission of the first positioning assembly during valve seat fixing and a second transmission assembly for transmission of the driving assembly; It should be noted that: during the processing of the valve seat by the plasma welding equipment through the fixed assembly, the first positioning assembly, the second positioning assembly, the driving assembly and other components are matched with each other, so that the multi-process welding of the valve seat, the valve stem and the flange can be completed at one time, without the need for disassembly and repositioning, thereby reducing the cumulative error in the repeated clamping process, ensuring the efficiency of the valve body 201 processing, and simultaneously and automatically positioning the valve body 201 and the valve stem body 202 of the valve seat during the fixing process, without the need for position calibration and adjustment of the valve seat again, so that the purpose of rapid fixing and automatic adjustment can be achieved, facilitating the rapid fixing and efficient machining of the valve seat.

[0019] Preferably, the first positioning assembly comprises a plurality of strip plates 301 arranged in a ring array on the front side of the first positioning disc 102, and a connecting assembly is arranged between the first positioning disc 102 and the strip plates 301 to assist in guiding connection; an arc plate 302 is connected to the strip plate 301 by an elastic assembly; one side of the arc plate 302 is rotatably connected to a plurality of spherical grooves 303, and a ball 304 is arranged in the spherical groove 303 for abutting and pressing against the inner wall of the valve body 201; It should be noted that: through transmission, the balls 304 in the spherical grooves 303 of the arc plate 302 abut against the inner wall of the valve body 201, and through the abutting action of the balls 304 in the spherical grooves 303 of the arc plate 302, the valve body 201 is centrally positioned, and during the abutting positioning process, the centrally positioned valve body 201 can still be adjusted around the axial direction, which is convenient for subsequent positioning operation of the valve stem body 202.

[0020] Preferably, the elastic assembly comprises a plurality of T-shaped rods 401 slidably connected to the strip plates 301, one end of the T-shaped rod 401 is fixed to the arc plate 302, and the outer side of the T-shaped rod 401 is sleeved with a first spring 402, and the two ends of the first spring 402 are respectively connected to the strip plate 301 and the arc plate 302; It should be noted that: through transmission, the balls 304 in the spherical grooves 303 of the arc plate 302 abut against the inner wall of the valve body 201, and through the abutting action of the balls 304 in the spherical grooves 303 of the arc plate 302, the valve body 201 is centrally positioned, and during the abutting positioning process, the centrally positioned valve body 201 can still be adjusted around the axial direction, which is convenient for subsequent positioning operation of the valve stem body 202.

[0021] Preferably, the connecting assembly comprises a mounting cavity 501 opened in the first positioning disc 102, a disc 502 is telescopically connected to the mounting cavity 501 by a telescopic assembly, one side of the disc 502 protrudes outward from the mounting cavity 501, a plurality of sliding grooves 503 are opened in the disc 502, a connecting plate 505 is arranged in each sliding groove 503, a plurality of guide rods 504 are slidably connected to the connecting plate 505, the guide rod 504 is fixed in the sliding groove 503, and each connecting plate 505 is fixed to each strip plate 301; It should be noted that: in the process of fixing the valve body 201, the disc 502 is pushed towards the first positioning disc 102, and the connecting plate 505 and the first transmission pin 703 on the connecting plate 505 are driven to move synchronously through the connecting action of the guide rod 504 in each group of sliding grooves 503. In the process of movement of the connecting plate 505 and the first transmission pin 703, the connecting plate 505 moves towards the inside of the mounting cavity 501 while moving towards the side of the disc 502 in the sliding groove 503. In the process of movement of the connecting plate 505, the strip plate 301 and the elastic component are connected to drive each group of arc-shaped plates 302 to move away from each other in the inside of the valve body 201.

[0022] Preferably, the first transmission assembly comprises a first transmission plate 701 fixed in the inside of the mounting cavity 501, the first transmission plate 701 is provided with a first inclined groove 702, the first inclined groove 702 is slidably connected with a first transmission pin 703, and the first transmission pin 703 is fixed on the connecting plate 505; It should be noted that: with the disc 502 being pushed towards the first positioning disc 102, the connecting plate 505 and the first transmission pin 703 on the connecting plate 505 are driven to move synchronously through the connecting action of the guide rod 504 in each group of sliding grooves 503. In the process of movement of the connecting plate 505 and the first transmission pin 703, the connecting plate 505 moves towards the inside of the mounting cavity 501 while moving towards the side of the disc 502 in the sliding groove 503.

[0023] Preferably, the telescopic assembly is provided with a plurality of groups, and the plurality of groups of telescopic assemblies are arranged in a ring array in the inside of the mounting cavity 501. The telescopic assembly comprises a sleeve 601 fixed in the inside of the mounting cavity 501, a sliding rod 602 slidably connected with the sleeve 601, one end of the sliding rod 602 fixed with the disc 502, a second spring 603 sleeved outside the sleeve 601, and the other end of the second spring 603 respectively abutting against the inner wall of the mounting cavity 501 and the disc 502; It should be noted that: through the sleeve 601 and the sliding rod 602, the telescopic connection of the disc 502 is facilitated, and through the second spring 603, the disc 502 after contraction is reset.

[0024] Preferably, the second positioning assembly comprises an L-shaped frame 801 fixed on the first positioning disc 102, a fixed shaft 802 fixed on the L-shaped frame 801, two groups of flip plates 803 rotatably connected with the fixed shaft 802 and arranged in a staggered and symmetrical manner, and an extrusion roller 804 fixed on the flip plate 803 and used for abutting and extruding the outer side of the valve stem body 202; It should be noted here that: in the process of the disc 502 moving towards the inside of the mounting cavity 501, through transmission, the two groups of turnover plates 803 are driven to perform a turnover movement towards the outside of the valve rod body 202 with the fixed shaft 802 as the center, and in the process of movement, the two groups of extrusion rollers 804 respectively abut against the outside of the valve rod body 202 to push and position the valve rod body 202. In addition, it should be noted here that: the extrusion rollers 804 are supported by fiber-reinforced plastic and have a certain hardness while can be deformed in the process of strong extrusion, through the setting of the hardness of the extrusion rollers 804, the effective extrusion of the valve rod body 202 is ensured, and through deformation, adaptive extrusion can be realized.

[0025] Preferably, the driving assembly includes a gear ring 901 fixed on the turnover plate 803, the two groups of gear rings 901 are arranged concentrically with the fixed shaft 802, the outside of the first positioning disc 102 is provided with a bottom plate 902, and the bottom plate 902 is fixed with two groups of gear racks 903 arranged in mesh with the two groups of gear rings 901 respectively, and the two groups of gear racks 903 are respectively located on the two sides of the fixed shaft 802. It should be noted here that: in the process of the disc 502 moving towards the inside of the mounting cavity 501, the bottom plate 902 is driven to move through transmission, and in the process of movement of the bottom plate 902, the two groups of gear racks 903 are respectively located on the two sides of the fixed shaft 802, and the two groups of gear racks 903 are respectively arranged in mesh with the two groups of gear rings 901 through the mesh transmission of the two groups of gear racks 903, thereby driving the two groups of turnover plates 803 to perform a turnover movement towards the outside of the valve rod body 202 with the fixed shaft 802 as the center.

[0026] Preferably, the second driving assembly includes a plurality of transmission rods 1001 slidingly connected to the first positioning disc 102, the inside of the mounting cavity 501 is provided with a second transmission plate 1002, the two ends of the transmission rod 1001 are respectively fixed with the bottom plate 902 and the second transmission plate 1002, the second transmission plate 1002 is provided with a second inclined slot 1003, the disc 502 is fixed with a mounting plate 1004, the mounting plate 1004 is fixed with a second transmission pin 1005, and the second transmission pin 1005 is slidingly connected to the second inclined slot 1003 of the second transmission plate 1002. It should be noted here that: in the process of the disc 502 moving towards the inside of the mounting cavity 501, the mounting plate 1004 is driven to move synchronously, in the process of movement of the mounting plate 1004, the second transmission plate 1002 and each group of transmission rods 1001 on the second transmission plate 1002 are driven to move towards the outside of the first positioning disc 102 through the interaction of the second transmission pin 1005 and the second inclined slot 1003 of the second transmission plate 1002, and the bottom plate 902 is driven to move through the movement of each group of transmission rods 1001.

[0027] In the scheme: a fixing assembly for valve seat machining includes the following steps: In the process of processing the valve seat by the plasma welding equipment, the valve body 201 is fixed inside the equipment. In the process of fixing, the valve body 201 of the valve seat is placed towards the first positioning disc 102. In the process of placing, the disc 502 is abutted with the end surface of the valve body 201. The placed valve seat is supported by the abutting action of the disc 502 with the end surface of the valve body 201 and the connecting support action of the telescopic assembly. In the process of placing, each group of arc-shaped plates 302 is at the inner side of the valve body 201. In the process of supporting and placing, the entire valve seat is between the first positioning disc 102 and the second positioning disc 105. After the valve seat is supported and placed, the second positioning disc 105 is driven by the telescopic component 106 to move towards the valve body 201. In the process of moving, the second positioning disc 105 is abutted with the other side end surface of the valve body 201. In the process of abutting, the valve seat and the disc 502 abutted and supported with the valve body 201 are driven by the continuous movement of the second positioning disc 105 to move towards the first positioning disc 102 and finally abut the end surface of the valve body 201 with the first positioning disc 102 (see the state of Figure 9 The valve seat is fixed by the abutting action of the first positioning disc 102 and the second positioning disc 105 with the two side end surfaces of the valve body 201. In the process of fixing, the valve seat is fixed by the abutting and extruding mode of the two side end surfaces, so that the multi-process welding processing of the valve seat, valve stem, flange and other components can be completed by one-time clamping. The accumulated error generated in the repeated clamping process is reduced, and the processing efficiency of the valve body 201 is ensured. In the process of fixing the valve body 201, the disc 502 is driven to move towards the first positioning disc 102. The connecting plate 505 and the first transmission pin 703 on the connecting plate 505 are synchronously moved by the connecting action of the guide rod 504 in each group of sliding grooves 503. In the process of moving the connecting plate 505 and the first transmission pin 703, the connecting plate 505 moves towards the inside of the mounting cavity 501 while moving towards the circumferential side of the disc 502 in the inside of the sliding groove 503 (i.e. each group of connecting plates 505 moves away from each other under force) by the interaction of the first transmission pin 703 with the first inclined groove 702 on the first transmission plate 701. In the process of moving the connecting plate 505, each group of arc-shaped plates 302 moves away from each other in the inside of the valve body 201 by the connecting action of the strip-shaped plate 301 and the elastic assembly (see Figure 12In the process of movement, the balls 304 inside each group of spherical grooves 303 on the arc-shaped plate 302 abut against the inner wall of the valve body 201, the valve body 201 is centrally positioned by the abutting action of the balls 304 on the arc-shaped plate 302 and the inner wall of the valve body 201, and in the process of abutting positioning, the centrally positioned valve body 201 can still swing around the axial direction by the rotating action of the balls 304 inside the spherical grooves 303, facilitating the subsequent positioning operation of the valve rod body 202, and in the process of movement of the disc 502 towards the inside of the mounting cavity 501, the mounting plate 1004 is driven to move synchronously, in the process of movement of the mounting plate 1004, the second transmission plate 1002 and the transmission rods 1001 on the second transmission plate 1002 are driven to move towards the outside of the first positioning disc 102 by the interaction of the second transmission pin 1005 and the second inclined groove 1003 on the second transmission plate 1002, the base plate 902 is pushed to move by the movement of the transmission rods 1001, and in the process of movement of the base plate 902, the two groups of racks 903 are respectively located on the two sides of the fixed shaft 802, and the two groups of racks 903 are respectively meshed with the two groups of gear rings 901 to drive the two groups of turnover plates 803 to turn around the fixed shaft 802 and turn over towards the outside of the valve rod body 202 (see Figure 13 In the process of movement, the balls 304 inside each group of spherical grooves 303 on the arc-shaped plate 302 abut against the inner wall of the valve body 201, the valve body 201 is centrally positioned by the abutting action of the balls 304 on the arc-shaped plate 302 and the inner wall of the valve body 201, and in the process of abutting positioning, the centrally positioned valve body 201 can still swing around the axial direction by the rotating action of the balls 304 inside the spherical grooves 303, facilitating the subsequent positioning operation of the valve rod body 202, and in the process of movement of the disc 502 towards the inside of the mounting cavity 501, the mounting plate 1004 is driven to move synchronously, in the process of movement of the mounting plate 1004, the second transmission plate 1002 and the transmission rods 1001 on the second transmission plate 1002 are driven to move towards the outside of the first positioning disc 102 by the interaction of the second transmission pin 1005 and the second inclined groove 1003 on the second transmission plate 1002, the base plate 902 is pushed to move by the movement of the transmission rods 1001, and in the process of movement of the base plate 902, the two groups of racks 903 are respectively located on the two sides of the fixed shaft 802, and the two groups of racks 903 are respectively meshed with the two groups of gear rings 901 to drive the two groups of turnover plates 803 to turn around the fixed shaft 802 and turn over towards the outside of the valve rod body 202 (see

[0028] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or action from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or actions. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0029] Although embodiments of the present application 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 thereto without departing from the principles and spirit of the present application, 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 seat (101) and a second mounting seat (104) are used to clamp and fix a valve seat during plasma welding. The first mounting seat (101) and the second mounting seat (104) are detachably mounted on the inner side of a plasma welding device. The valve seat is arranged between the first mounting seat (101) and the second mounting seat (104). The valve seat includes a valve body (201) and a valve stem body (202) fixed to the outer side of the valve body (201). End surfaces for installation and positioning are provided at the front and rear ends of the valve body (201). The valve stem The end of the valve body (202) is provided with a flange (203) for auxiliary connection, the first mounting seat (101) is fixedly connected with a first positioning plate (102) for positioning against the end face of the valve body (201) via a plurality of fixing rods (103), one side of the second mounting seat (104) is provided with a second positioning plate (105) for pressing against the other end face of the valve body (201), and the second mounting seat (104) is provided with a telescopic component (106) for telescopically driving the second positioning plate (105); It is characterized by further comprising: A first positioning assembly is provided on the first positioning plate (102) and is used for centering the valve body (201) during the valve seat fixing process; a second positioning assembly, arranged on the first positioning plate (102) and used for centering the valve stem body (202) during the valve seat fixing process; a driving assembly for driving the second positioning assembly is arranged outside the first positioning plate (102); Also provided are a first transmission component for transmitting the first positioning component during the valve seat fixing process, and a second transmission component for transmitting the driving component.

2. A fixing assembly for valve seat machining according to claim 1, characterized in that: The first positioning assembly includes a plurality of strip plates (301), and the plurality of strip plates (301) are arranged in a ring array on the front side of the first positioning disk (102). A connection assembly for auxiliary guide connection is provided between the first positioning disk (102) and the strip plates (301). The strip plates (301) are connected to an arc plate (302) via an elastic assembly. 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) via a plurality of spherical grooves (303).

3. A fixing assembly for valve seat machining according to claim 2, characterized in that: The elastic component comprises a plurality of groups of T-shaped rods (401) slidably connected to the strip plate (301), one end of the T-shaped rod (401) being fixed to the arc plate (302), a first spring (402) being sleeved on the outer side of the T-shaped rod (401), and two ends of the first spring (402) being respectively connected to the strip plate (301) and the arc plate (302).

4. A fixing assembly for valve seat machining according to claim 2, characterized in that: The connecting assembly includes a mounting cavity (501) provided on a first positioning plate (102), a circular disc (502) being telescopically connected to the mounting cavity (501) via a telescopic assembly, and one side of the circular disc (502) protrudes from the outside of the mounting cavity (501), a plurality of groups of chute (503) being provided on the circular disc (502), a connecting plate (505) being provided inside each group of the chute (503), a plurality of groups of guide rods (504) being slidably connected to the connecting plate (505), the guide rods (504) being fixed inside the chute (503), and each group of the connecting plates (505) being fixed to each group of the strip plates (301).

5. A fixing assembly for valve seat machining according to claim 4, characterized in that: The first transmission assembly includes a first transmission plate (701) fixed inside the installation cavity (501), a first inclined slot (702) is provided on the first transmission plate (701), a first transmission pin (703) is slidably connected to the first inclined slot (702), and the first transmission pin (703) is fixed on the connecting plate (505).

6. The fixing assembly for valve seat machining according to claim 4, characterized in that: The telescopic components are provided in multiple groups, and the multiple groups of telescopic components are arranged in a ring array inside the installation cavity (501). The telescopic components include a sleeve (601) fixed inside the installation cavity (501), a slide rod (602) is slidably connected to the sleeve (601), one end of the slide rod (602) is fixed to the disc (502), and a second spring (603) is provided on the outer side of the sleeve (601), and the two ends of the second spring (603) are respectively arranged to abut against the inner wall of the installation cavity (501) and the disc (502).

7. The fixing assembly for valve seat machining according to claim 4, characterized in that: The second positioning assembly comprises an L-shaped frame (801) fixed on the first positioning plate (102), a fixed shaft (802) fixed on the L-shaped frame (801), two groups of flip plates (803) symmetrically arranged in a staggered state are rotatably connected to the fixed shaft (802), and an extrusion roller (804) for pressing against the outer side of the valve stem body (202) is fixed on the flip plate (803).

8. The fixing assembly for valve seat machining according to claim 7, characterized in that: The driving assembly includes a gear ring (901) fixed on the flip plate (803), two groups of the gear rings (901) are arranged concentrically with the fixed shaft (802), a base plate (902) is arranged on the outer side of the first positioning plate (102), and two groups of racks (903) are fixed on the base plate (902) and are respectively meshed with the two groups of gear rings (901), and the two groups of racks (903) are respectively located on both sides of the fixed shaft (802).

9. The fixing assembly for valve seat machining according to claim 8, characterized in that: The second transmission assembly includes a plurality of transmission rods (1001) slidably connected to the first positioning disk (102); a second transmission plate (1002) is provided inside the mounting cavity (501); two ends of the transmission rod (1001) are respectively fixed to the base 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 disc (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).

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