Online high-precision chamfering device for valve seat ring of nuclear-grade electric gate valve of third-generation nuclear power plant

Abstract

The invention discloses an online high-precision chamfering machining device for a valve seat ring of a nuclear-grade electric gate valve of a third-generation nuclear power plant. The online high-precision chamfering machining device aims at solving the problems that the requirement for machining precision of sealing face chamfering operation is high, the requirement for machining efficiency is high, the operation space is small, and a traditional grinding machine cannot be used for chamfering. The chamfering machining device comprises a valve shell simulation body, a chamfering device base is installed on the valve shell simulation body, an X-axis sliding table is installed on the chamfering device base, a Z-axis sliding table is installed on the X-axis sliding table, a Y-axis sliding table is installed on the side face of the Z-axis sliding table, a grinding assembly is installed on the Y-axis sliding table, and a chamfering grinding tool is installed at the lower end of the grinding assembly and used for machining a chamfer. The sealing surface chamfering device can be suitable for environments with high machining precision requirements, high machining efficiency requirements and small operation space in sealing surface chamfering operation, the working efficiency of chamfering can be improved, and the difficulty of maintenance operation is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of nuclear equipment, and particularly relates to an on-line high-precision chamfering processing device for the seat ring of a nuclear-grade electric gate valve in a third-generation nuclear power plant. Background Art

[0002] The thrust output by the actuator for setting the torque switch of a nuclear-grade electric gate valve under static conditions will decrease under dynamic conditions. The AP1000 unit requires that all nuclear-grade electric gate valves and globe valves should verify the stem friction coefficient and the output efficiency of the actuator under dynamic conditions in accordance with the requirements of ASME QME-1. Verification through the EPRIPPM (Performance Prediction Model) software shows that the PV01 gate valve will tilt at the middle stroke (half-open position) under the action of high flow velocity. Higher contact stresses are generated at the contact part between the gate plate and the valve seat sealing surface, which may cause damage to the valve sealing surface, valve jamming, an increase in the required thrust for opening and closing and being unpredictable, as follows Figure 1 shown, in which the valve closing force 101, the acting force of the gate plate guide rib 102, the fluid horizontal acting force 103, the valve seat friction force 104, the guide rib contact position 105, the guide rib friction force 106, the fluid vertical acting force 107, and the sealing surface contact position 108 are schematically shown.

[0003] According to the literature of the Electric Power Research Institute (EPRI) of the United States, damage to the sealing surface can be avoided by increasing the chamfer width of the sealing surface and reducing the sharpness of the chamfer. The requirements for the valve seat chamfer are as Figure 2 shown, with high-precision requirements for both the size and angle of the chamfer. Manual chamfering cannot meet the requirements. Figure 2 The chamfer height D7 (>1.6 mm), the chamfer hypotenuse L (>2.2 mm), the valve seat sealing surface 201, the valve seat inner diameter 202, and the valve seat outer diameter 203 are schematically shown therein.

[0004] The chamfer of the gate valve is a specific requirement of the AP1000 unit, and there is no clear requirement for domestic peer power plants. Therefore, this work has not been carried out in domestic nuclear power plants. The electric gate valves involved in this problem are all nuclear level 1 and 2 safety-related valves, and some are the primary circuit pressure boundary. Therefore, the maintenance window is tight and the requirement for maintenance efficiency is high. The positions of some valves are relatively narrow, and large maintenance equipment cannot be used, so there are certain requirements for the portability of maintenance equipment. Summary of the Invention

[0005] The purpose of this application is to provide an on-line high-precision chamfering processing device for the seat ring of a nuclear-grade electric gate valve in a third-generation nuclear power plant, so as to solve the problems of high processing accuracy requirements, high processing efficiency requirements for the chamfering operation of the sealing surface, and the inapplicability of traditional grinding machines for chamfering due to small operation space.

[0006] To achieve the above object, the present application provides the following technical solutions:

[0007] The present application provides an on-line high-precision chamfering processing device for the nuclear-grade electric gate valve seat ring of a third-generation nuclear power plant, including a valve shell simulation body, on which a chamfering device base is installed, on which an X-axis slide is installed, on which a Z-axis slide is installed, on the side of the Z-axis slide, a Y-axis slide is installed, on which a grinding assembly is installed, and at the lower end of the grinding assembly, a chamfering grinding tool is installed for processing the chamfer.

[0008] In some embodiments, the chamfering grinding tool includes a vertical rod, a centering sensor calibration ring, a position sensor, a position sensor fine-tuning screw, a centering assembly and a cylinder gauge mounting base plate, a dial indicator. The dial indicator is installed at the upper part of the vertical rod, the lower part of the vertical rod is connected to the centering assembly and the cylinder gauge mounting base plate, the centering sensor calibration ring is installed on the centering assembly and the cylinder gauge mounting base plate, and the position sensor is arranged inside the centering sensor calibration ring and is installed on the centering assembly and the cylinder gauge mounting base plate through the position sensor fine-tuning screw.

[0009] In some embodiments, the number of the vertical rods is 2 and they are symmetrically arranged, and the dial indicator is installed on each vertical rod.

[0010] In some embodiments, the number of the position sensors is 4, and they are arranged at intervals of 90° along the inside of the centering sensor calibration ring.

[0011] In some embodiments, the grinding assembly includes a grinding disc, a main shaft motor, and a grinding bracket. The grinding disc is connected to the grinding bracket, the grinding bracket is connected to the Y-axis grinding assembly slider, the main shaft motor is connected to the grinding bracket, and the main shaft motor and the grinding disc are driven by a belt.

[0012] In some embodiments, the X-axis slide is connected to the Z-axis slide through an X / Z connecting plate, and the X-axis driving motor drives the X / Z connecting plate to move in the X-axis direction according to the driving signal; the Y-axis slide is connected to the Y-axis slide through a Y / Z connecting plate, and the Z-axis driving motor drives the Y / Z connecting plate to move in the Z-axis direction according to the driving signal; the Y-axis driving motor is connected to the grinding assembly transmission nut through a ball screw, and the Y-axis driving motor drives the slider to move in the Y-axis direction according to the driving signal.

[0013] In some embodiments, the X-axis slide includes an X-axis bottom plate, a guide rail, and an X-axis motor. The X-axis bottom plate and the guide rail are connected by bolts, and the X-axis motor and the bottom plate are connected by bolts; the Y-axis slide includes a Y-axis bottom plate, a guide rail, and a Y-axis motor. The Y-axis bottom plate and the guide rail are connected by bolts, and the Y-axis motor and the bottom plate are connected by bolts; the Z-axis slide includes a Z-axis bottom plate, a guide rail, and a Z-axis motor. The Z-axis bottom plate and the guide rail are connected by bolts, and the Z-axis motor and the bottom plate are connected by bolts.

[0014] In some embodiments, an X-axis slide mounting groove is formed in the base of the chamfering device, and the X-axis slide is mounted in the X-axis slide mounting groove.

[0015] In some embodiments, the upper part of the base of the chamfering device is an inclined surface with an angle of 5°, and the lower part has a positioning boss.

[0016] In some embodiments, the axis of the X-axis slide is parallel to the axis of the pipeline of the valve housing simulation body.

[0017] Compared with the prior art, the on-line high-precision chamfering processing device for the nuclear-grade electric gate valve seat ring of the third-generation nuclear power plant provided by the present application has the following beneficial effects:

[0018] The present application can be applied to environments with high requirements for the processing accuracy of the sealing surface chamfering operation, high requirements for the processing efficiency, and a small operation space.

[0019] The present application completes the inner circle chamfering of the valve seat sealing surface of the automatic gate valve through sensors, controllers, and drive motors, improves the working efficiency of chamfering, and reduces the difficulty of maintenance operations.

[0020] Furthermore, the maintenance equipment for the inner circle chamfering of the valve seat sealing surface of the gate valve in the present application adopts a split combination design, which is convenient for disassembly and assembly, has the characteristics of small volume, light weight, and convenient carrying, and is suitable for on-site chamfering work of the gate valve chamfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the present application, the drawings required for the technical description will be briefly introduced below.

[0022] Figure 1 It is a schematic diagram of the gate plate tilting under the action of a high-flow medium in the prior art;

[0023] Figure 2 It is a schematic diagram of the inner circle chamfering of the valve seat sealing surface of the gate valve in the prior art;

[0024] Figure 3 It is a schematic structural diagram of the on-line high-precision chamfering processing device for the nuclear-grade electric gate valve seat ring of the third-generation nuclear power plant provided by the present application;

[0025] Figure 4 Schematic diagram for adjusting the concentricity and parallelism between the special chamfer grinding tool provided for this application and the valve seat

[0026] Description of reference numerals:

[0027] 1. Valve housing simulation body; 2. Chamfering device base; 3. X-axis slide; 4. X / Z-axis connecting plate; 5. Y-axis slide; 6. Y / Z-axis connecting plate; 7. Z-axis slide; 8. Grinding assembly; 9. Parallelism fine-tuning knob; 10. Vertical rod; 11. Center-finding sensor calibration ring; 12. Position sensor; 13. Position sensor fine-tuning screw; 14. Centering assembly and cylinder gauge mounting base plate; 15. Dial indicator

[0028] 101. Valve closing force; 102. Gate guide rib acting force; 103. Fluid horizontal acting force; 104. Valve seat friction force; 105. Guide rib contact position; 106. Guide rib friction force; 107. Fluid vertical acting force; 108. Sealing surface contact position

[0029] 201. Valve seat sealing surface; 202. Valve seat inner diameter; 203. Valve seat outer diameter Detailed implementation manners

[0030] The following is a further detailed description through specific implementation manners

[0031] This application provides an online high-precision chamfering processing device for the valve seat ring of a nuclear-grade electric gate valve in a third-generation nuclear power plant, including a chamfering device base 2, a three-dimensional slide, a grinding assembly 8, and a control system. The chamfering device base 2 is a device for reliably fixing the maintenance equipment to the middle flange of the gate valve. The three-dimensional slide is connected to the upper surface of the chamfering device base 2 to provide movement in three coordinate directions for the chamfering work. The grinding assembly 8 is connected to the three-dimensional slide and is in direct contact with the sealing surface of the gate valve to provide torque for chamfering grinding. The control system controls the displacement of the three-dimensional slide and the grinding movement of the grinding assembly 8 through control software and a controller

[0032] The chamfering device base 2 includes a base body and connecting bolts. The stop of the chamfering device base 2 is completely sunk into the flange hole of the gate valve, and the direction is parallel to the X-axis slide 3 installation side and the axis of the valve pipeline. There are two screw holes on the lower surface of the base, and it is fixed to the middle flange of the valve by two fixed bolt assemblies and a limit plate assembly. The fixed bolt assembly consists of a nut, a flat gasket, a spring, and a locator from bottom to top, and passes through the flange hole to connect to the base screw hole. The limit plate assembly consists of a nut, a flat gasket, a spring, and a locator from bottom to top, and the screw passes through the flange hole and is connected to the angular plate member by a nut

[0033] The three-dimensional sliding table includes an X-axis sliding table 3, a Y-axis sliding table 5, a Z-axis sliding table 7, an X / Z connecting plate 4, a Y / Z connecting plate 6, a driving motor, and a Y-axis grinding component slider. The X-axis sliding table 3 is connected to the Z-axis sliding table 7 through the X / Z connecting plate 4, and the X-axis driving motor drives the X / Z connecting plate 4 to move in the X-axis direction according to the driving signal. The Z-axis sliding table 5 is connected to the Y-axis sliding table through the Y / Z connecting plate 6, and the Z-axis driving motor drives the Y / Z connecting plate 6 to move in the Z-axis direction according to the driving signal. The Y-axis driving motor is connected to the grinding component transmission nut through a ball screw, and the Y-axis driving motor drives the slider to move in the Y-axis direction according to the driving signal.

[0034] The grinding component 8 includes a grinding disc, a calibration disc, a spindle motor, and a grinding bracket. The grinding disc is the same size as the gate valve sealing surface and is fixed to the grinding bracket by four screws. The grinding bracket is connected to the Y-axis grinding component transmission nut by four screws. Four sensors are evenly distributed around the calibration disc for positioning the machining center point. The spindle motor is connected to the grinding bracket by four screws, and the spindle motor and the grinding disc are driven by a belt.

[0035] The control system includes a controller, a manual pulse remote control, and control software. The controller is connected to the X-axis motor, Y-axis motor, Z-axis motor, and spindle through cables, and outputs power and signals for the motor operation. The controller receives the position signal and displays the coordinate information on the operation software. The control software inputs the feed rate, and the controller controls the movement of the spindle motor and the three-dimensional sliding table. The manual pulse remote control is connected to the controller to manually control the movement of the three-dimensional sliding table and the emergency stop of the system.

[0036] As Figure 3 shown, the device specifically includes a valve housing simulation body 1, a chamfering device base 2, an X-axis sliding table 3, an X / Z axis connecting plate 4, a Y-axis sliding table 5, a Y / Z axis connecting plate 6, a Z-axis sliding table 7, a grinding component 8, and a parallelism fine-tuning knob 9.

[0037] The chamfering device base 2 is installed on the valve housing simulation body 1, the X-axis sliding table 3 is installed on the chamfering device base 2, the Z-axis sliding table 7 is installed on the X-axis sliding table 3, the Y-axis sliding table 5 is installed on the side of the Z-axis sliding table 7, the grinding component 8 is installed on the Y-axis sliding table 5, and a chamfering grinding tool is installed at the lower end of the grinding component 8 for machining the chamfer.

[0038] As Figure 4 shown, the chamfering grinding tool includes two vertical rods 10, a center-finding sensor calibration ring 11, a position sensor 12, a position sensor fine-tuning screw 13, a centering component, and a cylinder gauge mounting base 14.

[0039] A dial indicator 15 is provided on each vertical rod 10. The vertical rod 10 is used to increase the height of the cylinder gauge, which is used to calibrate the parallelism between the device and the sealing surface. It should be noted that the dial indicator 15 is a component of the cylinder gauge, and both are used to measure dimensions. Since the distance between the two valve seats of the gate valve is too narrow to directly install the dial indicator, the cylinder gauge is used, and the vertical rod 10 and the dial indicator 15 are components of the cylinder gauge.

[0040] The centering sensor calibration ring 11 is installed on the centering component and the cylinder gauge mounting base plate 14. Two vertical rods 10 are symmetrically installed on the centering component and the cylinder gauge mounting base plate 14. The centering component and the cylinder gauge mounting base plate 14 are used to determine the center in cooperation with the grinding shaft. The two vertical rods 10 are symmetrically arranged on both sides of the grinding component 8.

[0041] The number of position sensors 12 is 4, which are respectively arranged along the inner side of the centering sensor calibration ring 11 at 90° and fixed on the centering component and the cylinder gauge mounting base plate 14 through the position sensor fine-tuning screws 13. The position sensor fine-tuning screws 13 are used for precise adjustment when calibrating the action points of the position sensors 12.

[0042] In one embodiment, the centering sensor calibration ring 11 is subjected to quenching and tempering treatment with 40Cr, and is precisely machined to adjust the action points of the position sensors 12 and at the same time to zero the cylinder gauge, and to calibrate the distance from the contact point of the centering sensor calibration ring 11 to the sealing surface, such as 0.5 mm.

[0043] In one embodiment, the internal dimensions of the valve housing simulation body 1 are designed and manufactured according to the actual object, and the seat ring is designed to be quickly replaceable, which is convenient for multiple simulation operations.

[0044] In one embodiment, the upper part of the chamfering device base 2 is an inclined surface with an angle of 5°, and the lower part has a positioning boss, which cooperates with the upper sealing position stop of the valve body.

[0045] In one embodiment, the X-axis slide 3 is selected as a precision module. Considering the operation space, it is arranged close to the edge to avoid obstacles in the X direction. The X-axis slide 3 includes an X-axis base plate, a guide rail, and an X-axis motor. The X-axis base plate and the guide rail are connected by bolts, and the X-axis motor and the base plate are connected by bolts.

[0046] In one embodiment, the X-axis slide 3 and the Z-axis slide 7 are connected by an X / Z-axis connecting plate 4. The X / Z-axis connecting plate 4 specifically connects the Z-axis base plate of the X-axis slide 3 and the Z-axis slide 7. The X / Z-axis connecting plate 4 is formed by machining a whole piece of material to reduce the cumulative error.

[0047] In one embodiment, the Y-axis slide 5 is selected as a precision module. When the diameter of the interpolation circle with the Z-axis is satisfied, it is offset-mounted. When replacing the grinding wheel, the center positioning component, and the parallelism positioning component, the slide moves to the right for convenient operation. The Y-axis slide 5 includes a Y-axis base plate, a guide rail, and a Y-axis motor. The Y-axis base plate and the guide rail are connected by bolts, and the Y-axis motor and the base plate are connected by bolts.

[0048] In one embodiment, the Y-axis slide 5 and the Z-axis slide 7 are connected by a Y / Z-axis connecting plate 6. The Y / Z-axis connecting plate 6 specifically connects the Z-axis slide 7 and the Y-axis base plate of the Y-axis slide 5.

[0049] In one embodiment, the Z-axis slide 7 is selected as a precision module and is arranged on the left side to avoid obstruction when replacing the grinding wheel and the positioning component. The Z-axis slide 7 includes a Z-axis base plate, a guide rail, and a Z-axis motor. The Z-axis base plate and the guide rail are connected by bolts, and the Z-axis motor and the base plate are connected by bolts.

[0050] In one embodiment, an X-axis slide mounting groove is provided on the chamfering device base 2, and an X-axis slide 3 is installed in the X-axis slide mounting groove.

[0051] In one embodiment, the valve housing simulation body 1 has a flange surface. The chamfering device base 2 is placed on the flange surface of the valve housing simulation body 1, and the stop of the base 2 is completely sunk into the flange hole so that it cannot jump up and down.

[0052] In one embodiment, the X-axis slide 3 is parallel to the valve seat center line on the valve housing simulation body 1. After adjusting the parallelism, install the fixing bolt assembly and the limit plate assembly, and tighten the base fixing bolts.

[0053] The specific installation and use process of the device provided in this application is as follows:

[0054] The first step is to install the chamfering device base 2. Place the chamfering device base 2 on the flange surface of the valve housing simulation body 1. The stop of the base 2 needs to be completely sunk into the flange hole and cannot jump up and down. Adjust the direction to make the X-axis slide 3 and the pipeline axis of the valve housing simulation body 1 basically parallel. Install the fixing bolts and the limit plate, and tighten the base fixing bolts.

[0055] The second step is to install the three-dimensional slide. Remove the 4 M5 hexagon socket head cap screws on the X-axis slider, lift the Y / Z slide combination onto the X-axis slider, and fix it with the 4 M5 hexagon socket head cap screws just removed. Install the X-axis motor, Y-axis motor, and Z-axis motor. Insert the motor shaft into the coupling. First, fix the motor with 4 M5 screws, and then lock the coupling.

[0056] The third step is to install the grinding component 8. The calibration disc and the grinding support form the grinding component 8. Among them, the calibration disc can be detachably replaced with a grinding disc, and the calibration disc is used during position calibration.

[0057] The grinding support is fixed on the back plate of the Y-axis slider by 4 M10 screws. Install the calibration disc on the side of the grinding support facing away from the stainless steel cover plate. The calibration disc is fixed to the grinding support by 4 M4 screws in total.

[0058] Step 4: Connect the power supply, controller, and drive motor using the corresponding cables.

[0059] Step 5: Reset the system. Turn on the device power supply, release the emergency stop buttons on the controller and the hand pulse remote control, and wait for the device self-check to complete. Check whether the position sensors on each guide rail are normal (the indicator lights on the sensors are on). Set the controller to the manual mode Figure 2 , touch the green "Chamfering motor is powered on" option on the touch display screen to make it turn red "Chamfering motor is powered off" to turn off the spindle motor. Press the "System Reset" button on the control box. After the system reset is completed, the reset completion indicator in the lower left corner of the display screen changes from red to green. Install the calibration ring on the calibration disc, observe whether the upper, lower, left, and right indicator lights of the positioning disc on the display screen are all on. If any are not on, manually fine-tune the corresponding sensors to make them just light up, and zero the two dial indicators.

[0060] Step 6: Confirm the center position. Turn on the hand pulse, use the hand pulse remote control to move the grinding assembly 8 to a position where there are no obstacles when the Z-axis descends (negative direction), and turn off the hand pulse. Click "Determine Z-axis descent position" on the controller display screen. Turn on the hand pulse, use the hand pulse remote control to lower the calibration disc to near the sealing surface of the valve to be processed, slowly move the hand pulse calibration disc closer to the sealing surface to be processed (avoid hitting the pipe wall), observe the pointers of the two dial indicators. When the pointer of any one dial indicator starts to change, slow down the X-axis movement speed, and at the same time adjust the two parallelism adjustment screws on the side of the device base so that the pointers of the two dial indicators stop at zero at the same time to confirm the center position. Turn off the hand pulse and start, press the "Center positioning" button on the controller, and record the center coordinate position at this time. After the positioning is completed, it automatically returns to the position where the Z-axis is allowed to descend.

[0061] Step 7: Install the grinding disc. Turn on the hand pulse, move the grinding assembly 8 to the grinding disc installation position (the Z-axis slide 7 is at the upper limit position, and the Y-axis slide 5 is at the position away from the X-axis slide 3 limit), remove the calibration disc, and install the grinding disc.

[0062] Step 8: Tool setting. Turn off the handwheel start, click the "Go to the starting point of Y and Z movement" option on the controller display screen, which is defaulted to 2 mm above the center point. Turn on the handwheel start, turn on "Chamfering motor is powered on", turn on "Chamfering motor start", and the grinding disc starts to rotate. Use the handwheel to remotely control the grinding disc to slowly approach the surface to be machined. When the grinding disc touches the surface to be machined, immediately stop the movement of the X-axis and turn off the handwheel start. Click "Tool setting position teaching" on the display screen and record the Z-axis position coordinate at this time. Turn on the handwheel start, use the handwheel to remotely control the grinding disc to slowly move in the negative Z-axis direction, perform tool setting on the lower edge of the surface to be machined, and record the Z-axis position coordinate when the grinding wheel touches the lower edge of the surface to be machined. The difference between the two tool setting Z-axis coordinates is the major axis value of the elliptical compensation.

[0063] Step 9: Automatically chamfer the surface to be machined. In the controller system setting screen Figure 3 , input the value of the elliptical compensation, input the feed value according to the machining size, and set the controller to the automatic mode. In the automatic mode screen of the controller Figure 4 , which is the data monitoring screen. After the machining is completed, use flexible model clay to measure the right-angle side or hypotenuse size of the valve seat chamfer and confirm whether it meets the acceptance criteria. If it does not meet the requirements, repeat Step 9 until the acceptance criteria are met.

[0064] Step 10: Reset and complete. Withdraw the grinding disc from the valve housing simulation body 1 and remove the chamfering equipment from the valve housing simulation body 1 according to the assembly steps.

[0065] The above are only the specific implementation manners of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application.

Claims

1. An online high-precision chamfering device for valve seat ring of nuclear-grade electric gate valve in third-generation nuclear power plant, characterized in that: The invention comprises a valve casing simulation body (1), a chamfering device base (2) is installed on the valve casing simulation body (1), an X-axis slide (3) is installed on the chamfering device base (2), a Z-axis slide (7) is installed on the X-axis slide (3), a Y-axis slide (5) is installed on the side of the Z-axis slide (7), a grinding assembly (8) is installed on the Y-axis slide (5), and a chamfering grinding tool is installed at the lower end of the grinding assembly (8) for processing the chamfer.

2. According to the device for processing the valve seat ring of the third-generation nuclear power plant nuclear-grade electric gate valve in-line with high precision chamfering according to claim 1, it is characterized in that: The chamfer grinding tool comprises a vertical rod (10), a centering sensor calibration ring (11), a position sensor (12), a position sensor fine-tuning screw (13), a centering assembly and a cylinder gauge mounting base plate (14), and a dial indicator (15); the dial indicator (15) is mounted on the upper part of the vertical rod (10); the lower part of the vertical rod (10) is connected to the centering assembly and the cylinder gauge mounting base plate (14); the centering sensor calibration ring (11) is mounted on the centering assembly and the cylinder gauge mounting base plate (14); the position sensor (12) is arranged on the inner side of the centering sensor calibration ring (11) and is mounted on the centering assembly and the cylinder gauge mounting base plate (14) through the position sensor fine-tuning screw (13).

3. The on-line high-precision chamfering processing device for the valve seat ring of the nuclear-grade electric gate valve of the third-generation nuclear power plant according to claim 2 is characterized in that: The number of the vertical rods (10) is 2 and they are arranged symmetrically, and the dial indicator (15) is installed on each of the vertical rods (10).

4. The on-line high-precision chamfering processing device for the valve seat ring of the nuclear-grade electric gate valve of the third-generation nuclear power plant according to claim 2 is characterized in that: The number of the position sensors (12) is 4, and they are arranged at intervals of 90° along the inner side of the centering sensor calibration circle (11).

5. The on-line high-precision chamfering processing device for the valve seat ring of the nuclear-grade electric gate valve of the third-generation nuclear power plant according to claim 1 or 2 is characterized in that: The grinding assembly (8) comprises a grinding disc, a spindle motor and a grinding bracket, wherein the grinding disc is connected to the grinding bracket, the grinding bracket is connected to a Y-axis grinding assembly slider, the spindle motor is connected to the grinding bracket, and the spindle motor and the grinding disc are driven by a belt.

6. The on-line high-precision chamfering processing device for the valve seat ring of the nuclear-grade electric gate valve of the third-generation nuclear power plant according to claim 1 or 2 is characterized in that: The X-axis slide (3) is connected to the Z-axis slide (7) via an X / Z connecting plate (4), and the X-axis driving motor drives the X / Z connecting plate (4) to move in the X-axis direction according to a driving signal; the Y-axis slide (5) is connected to the Y-axis slide via a Y / Z connecting plate (6), and the Z-axis driving motor drives the Y / Z connecting plate (6) to move in the Z-axis direction according to a driving signal; The Y-axis driving motor is connected to the driving nut of the grinding assembly through a ball screw, and the Y-axis driving motor drives the slider to move in the Y-axis direction according to a driving signal.

7. The on-line high-precision chamfering processing device for the valve seat ring of the nuclear-grade electric gate valve of the third-generation nuclear power plant according to claim 1 or 2 is characterized in that: The X-axis slide (3) includes an X-axis base plate, a guide rail, and an X-axis motor, wherein the X-axis base plate and the guide rail are connected by bolts, and the X-axis motor and the base plate are connected by bolts; the Y-axis slide (5) includes a Y-axis base plate, a guide rail, and a Y-axis motor, wherein the Y-axis base plate and the guide rail are connected by bolts, and the Y-axis motor and the base plate are connected by bolts; the Z-axis slide (7) includes a Z-axis base plate, a guide rail, and a Z-axis motor, wherein the Z-axis base plate and the guide rail are connected by bolts, and the Z-axis motor and the base plate are connected by bolts.

8. The on-line high-precision chamfering processing device for the valve seat ring of the nuclear-grade electric gate valve of the third-generation nuclear power plant according to claim 1 or 2 is characterized in that: An X-axis slide installation groove is provided on the chamfering device base (2), and the X-axis slide (3) is installed in the X-axis slide installation groove.

9. The on-line high-precision chamfering processing device for the valve seat ring of the nuclear-grade electric gate valve of the third-generation nuclear power plant according to claim 1 or 2 is characterized in that: The upper part of the chamfering device base (2) is an inclined surface with an angle of 5°, and the lower part is provided with a positioning boss.

10. The on-line high-precision chamfering processing device for valve seat ring of nuclear-grade electric gate valve of third-generation nuclear power plant according to claim 1 or 2, characterized in that: The axis of the X-axis slide table (3) is parallel to the axis of the pipeline of the valve housing simulation body (1).

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