A portable grinding device for a valve core of a nuclear-grade ball valve

Abstract

This invention relates to the field of valve repair technology, and more particularly to a portable grinding device for the core of a nuclear-grade ball valve. The grinding device includes: a base, a base drive mechanism, a grinding device, and a grinding support frame; the grinding support frame is fixedly connected to the four corners of the base; the four corners of the grinding device are fixedly connected to the upper part of the grinding support frame; the base drive mechanism includes a worm gear rotatably connected to two opposing through-hole bearing seats at the lower part of the base, a gear on the lower turntable driving the worm gear, and a guide plate mounted above the lower turntable; an upper turntable is fixedly connected to the upper part of the lower turntable; the surface of the upper turntable is provided with several straight through grooves, and a clamping block slides through the straight through grooves of the upper turntable and is slidably connected to the guide groove at the upper end of the guide plate; the handle is movable. A screw for the handle, connected to the protruding part on the side of the guide plate, passes through the guide groove, allowing the guide plate to rotate within a fixed range. The valve core support ring is pushed to the center of the upper turntable by the clamping block and fixed. The valve core pressure plate is fixed to the annular groove around the upper turntable. The bearing chamber of the grinding device is fixed to the upper and lower through holes of the fixed frame. The drive shaft is rotatably connected to the bearing seat in the middle of the bearing chamber. The rotating shaft is fixed to the oblique through hole at the lower end of the drive shaft. The counterweight is fixed to the upper connecting rod of the grinding disc. The upper connecting rod of the grinding disc is movably connected to the lower end of the rotating shaft. The grinding fixture is installed below the grinding disc. This invention enables on-site grinding of valve cores, improving grinding efficiency and accuracy while reducing operational difficulty and risk.

Description

Technical Field

[0001] This invention relates to the field of valve repair technology, and in particular to a portable grinding device for the core of a nuclear-grade ball valve. Background Technology

[0002] In the nuclear energy industry, ball valves, as core components of fluid control systems, play a crucial role in regulating fluid direction, pressure, and flow rate. Their stability and reliability directly determine the safe and stable operation of nuclear facilities. However, because nuclear-grade ball valves typically operate in extreme environments such as high temperature, high pressure, and high radiation, the valve core is often subjected to the combined effects of fluid erosion, media corrosion, and mechanical wear, leading to performance degradation and even safety accidents.

[0003] Traditional methods for grinding nuclear-grade ball valve cores typically require disassembling the valve from the pipeline and transporting it to a specialized grinding workshop or equipment for processing. This method is not only complex and time-consuming, but the valve core is also susceptible to additional damage during transportation, potentially affecting the valve's sealing performance and service life. In recent years, with the continuous development of industrial technology, although some portable devices for valve grinding have appeared on the market, these devices often have limited functionality, primarily targeting the grinding needs of ordinary valves or low-requirement applications, and cannot meet the high precision, high efficiency, and high safety requirements of nuclear-grade ball valve core grinding. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a portable grinding device for nuclear-grade ball valve cores, which has advanced functions such as high-precision grinding and rapid positioning, and can grind valve cores on site, thereby improving grinding efficiency and accuracy and reducing operation difficulty and risk.

[0005] This invention provides a portable nuclear-grade ball valve core grinding device, comprising: a base, a base driving mechanism, a grinding device, and a grinding support frame;

[0006] The grinding support frame is fixedly connected to the four corners of the base; the grinding device is fixedly connected to the upper part of the grinding support frame at the four corners.

[0007] The base drive mechanism includes an upper turntable, a lower turntable, a guide plate, a worm gear, and a handle; the upper turntable has an annular groove on its edge; the worm gear is rotatably connected to two opposing through-hole bearing seats at the bottom of the base.

[0008] The gears on the lower turntable are driven by a worm gear.

[0009] The guide plate is installed above the lower turntable; the upper turntable is fixed to the upper part of the lower turntable;

[0010] The surface of the upper turntable is provided with several straight through slots.

[0011] The clamping block slides through the straight through groove of the upper turntable and is connected to the guide groove at the upper end of the guide plate.

[0012] The handle is movably connected to the protruding part on the side of the guide plate, and the screw of the handle passes through the annular groove, thereby allowing the guide plate to rotate within a fixed range;

[0013] The valve core support ring is pushed to the center of the upper turntable by the clamping block and fixed, and the valve core pressure plate is fixed to the annular groove around the upper turntable;

[0014] The grinding device includes a fixed frame, a bearing chamber, a drive shaft, a rotating shaft, a counterweight, a grinding disc, and a grinding fixture. The bearing chamber is fixedly connected to the upper and lower through holes of the fixed frame. The drive shaft is rotatably connected to the bearing seat in the middle of the bearing chamber. The rotating shaft is fixedly connected to the oblique through hole at the lower end of the drive shaft. The counterweight is fixedly connected to the upper connecting rod of the grinding disc. The upper connecting rod of the grinding disc is movably connected to the lower end of the rotating shaft. The grinding fixture is installed below the grinding disc.

[0015] In one specific embodiment of the present invention, the protruding part is provided with a threaded hole that passes through from top to bottom, and the handle screw is threadedly connected to the threaded hole. The guide plate and the upper turntable are fixed and locked by tightening the handle.

[0016] In one specific embodiment of the present invention, a valve core support pad is provided above the valve core support ring.

[0017] In one specific embodiment of the present invention, the counterweight is a plurality of blocks stacked on top of each other.

[0018] In one specific embodiment of the present invention, the upper and lower through holes are close to the center of the fixing frame.

[0019] In one specific embodiment of the present invention, the counterweight is fixedly connected to the upper connecting rod of the grinding disc by a first locking nut;

[0020] The top of the upper connecting rod of the grinding disc is threadedly fixed to the second locking nut.

[0021] In one specific embodiment of the present invention, one end of the worm gear is connected to a first drive mechanism.

[0022] In one specific embodiment of the present invention, the upper part of the drive shaft is connected to a second drive mechanism.

[0023] In one specific embodiment of the present invention, the height of the grinding support frame is adjustable.

[0024] In one specific embodiment of the present invention, a through hole is provided at the center of the base, and a pulley guide rail is provided on the side wall of the through hole;

[0025] A pulley assembly is fixedly connected to the bottom of the lower turntable, and the pulley assembly moves along the pulley guide rail.

[0026] Compared with the prior art, the portable nuclear-grade ball valve core grinding device of the present invention has the following beneficial effects:

[0027] (1) Through the assembly of various components, the function of quick disassembly and assembly is realized, which is easy to carry and can quickly realize the ability to repair the radioactive valve core on the spot.

[0028] (2) The guide plate, the upper turntable and the speed-up mechanism work together to position the valve core support ring so as to facilitate the support and fixation of the valve core;

[0029] (3) The counterweight is fixedly connected to the grinding disc. By installing different numbers and weights of counterweights, different downward pressures can be provided to the grinding disc to control the grinding cutting amount and grinding accuracy.

[0030] (4) The drive shaft drives the grinding disc to rotate axially, so that the grinding die is in consistent contact with the valve core surface; the worm drives the lower turntable, upper turntable and guide disc to rotate; through the two rotation amounts, the grinding die is ground non-overlappingly on the valve core sealing surface, thus improving the grinding quality. Attached Figure Description

[0031] Figure 1 This diagram shows the overall structure of a portable nuclear-grade ball valve core grinding device.

[0032] Figure 2 This diagram shows the overall structure of the base drive mechanism.

[0033] Figure 3 This is a schematic diagram of the rotating disk structure.

[0034] Figure 4 This is a schematic diagram of the overall structure of the grinding device;

[0035] In the picture,

[0036] 1. Base; 2. Base drive mechanism; 3. Grinding support frame; 4. Grinding device; 5. Upper turntable; 6. Pressure plate; 7. Fixing screw; 8. Valve core support ring; 9. Valve core support pad; 10. Worm gear; 11. Nut; 12. Fixing frame; 13. First screw; 14. Bearing chamber; 15. Drive shaft; 16. Rotating shaft; 17. Grinding fixture; 18. Grinding disc; 19. Counterweight; 20. First locking nut; 21. Second locking nut; 22. Second screw; 23. Straight through groove; 24. Clamping block; 25. Guide groove; 26. Handle; 27. Guide plate; 28. Lower turntable; 29. ​​Annular groove; 30. Gear; 31. Pulley assembly; 32. Pulley guide rail; 33. Ball valve core; 34. Second drive mechanism; 35. First drive mechanism. Detailed Implementation

[0037] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.

[0038] An embodiment of the present invention discloses a portable nuclear-grade ball valve core grinding device, such as... Figure 1 As shown, it includes: a base 1, a base drive mechanism 2, a grinding device 4, and a grinding support frame 3;

[0039] The grinding support frame 3 is fixedly connected to the four corners of the base 1; the grinding device 4 is fixedly connected to the upper part of the grinding support frame 3 at the four corners.

[0040] The height of the grinding support frame 3 is adjustable, and it can be composed of multiple support frame modules. The number of support frame modules can be adjusted according to the size of the ball valve core 33 so that its height meets the requirements.

[0041] like Figure 2 and Figure 3 As shown, the base drive mechanism 2 includes an upper turntable 5, a lower turntable 28, a guide plate 27, a worm gear 10, and a handle 26; the upper turntable 27 has an annular groove 29 on its edge;

[0042] The worm gear 10 is rotatably connected to two opposing through-hole bearing seats at the lower part of the base 1.

[0043] The base 1 has a through hole in the center, and a pulley guide rail 32 is provided on the side wall of the through hole;

[0044] The bottom of the lower turntable 28 is fixedly connected to a pulley assembly 31, which moves along the pulley guide rail 32.

[0045] The gear 30 on the lower turntable 28 is driven by the worm gear 10.

[0046] One end of the worm gear 10 is connected to the first drive mechanism 35;

[0047] The guide plate 27 is installed above the lower turntable 28; the upper turntable 5 is fixed to the upper part of the lower turntable 28 and secured by the second screw 22.

[0048] The surface of the upper turntable 5 is provided with a plurality of straight through grooves 23.

[0049] The clamping block 24 passes through the straight through groove 23 of the upper turntable 5 and is slidably connected to the guide groove 25 at the upper end of the guide plate 27.

[0050] The handle 26 is movably connected to the protruding part on the side of the guide plate 27, and the screw of the handle 26 passes through the annular groove 29, thereby allowing the guide plate 27 to rotate within a fixed range;

[0051] The protruding part is provided with a threaded hole that passes through from top to bottom. The handle screw is threadedly connected to the threaded hole. By tightening the handle, the guide plate 27 and the upper turntable 5 are fixed and locked, which prevents the clamping block 24 from loosening and ensures that the guide plate 27 and the upper turntable 5 rotate synchronously, making it easy to use.

[0052] The valve core support ring 8 is pushed to the center of the upper turntable 5 by the clamping block 24 and fixed thereon; the valve core pressure plate 6 is fixed to the annular groove 29 around the upper turntable 5.

[0053] A valve core support pad 9 is provided above the valve core support ring 8.

[0054] like Figure 4 As shown, the grinding device 4 includes a fixed frame 12, a bearing chamber 14, a drive shaft 15, a rotating shaft 16, a counterweight 19, a grinding disc 18, and a grinding fixture 17;

[0055] The first screw 13 passes through the through holes at the four corners of the fixing bracket 12 and is fixed to the threaded hole on the upper part of the grinding support bracket 3;

[0056] The bearing housing 14 is fixedly connected to the upper and lower through holes of the fixed frame 12, and the upper and lower through holes are close to the center of the fixed frame 12; the drive shaft 15 is rotatably connected to the bearing seat in the middle of the bearing housing 14, the rotating shaft 16 is fixedly connected to the oblique through hole at the lower end of the drive shaft 15, the counterweight is fixedly connected to the upper connecting rod of the grinding disc 18, and the upper connecting rod of the grinding disc 18 is movably connected to the lower end of the rotating shaft 16; the grinding fixture 17 is installed below the grinding disc 18.

[0057] The counterweight 19 consists of multiple pieces, stacked one on top of the other, and can be adjusted as needed.

[0058] The top of the upper connecting rod of the grinding disc 18 is threadedly fixed to the locking nut 20.

[0059] The upper part of the drive shaft 15 is connected to the second drive mechanism 34.

[0060] It should be noted that, as a portable nuclear-grade ball valve core grinding device, during use, firstly, a valve core support ring 8 conforming to the size of the ball valve core 33 is placed on the upper turntable 5. The handle 26 is used to control the guide plate 27 to rotate along the annular groove 29 of the upper turntable 5, causing the clamping block 24 to push the valve core support ring 8 to the center of the upper turntable 5 and tighten it. Then, the handle 26 is rotated downwards to fix the guide plate 27 to the upper turntable 5. Next, a valve core support pad 9 of appropriate size is installed on the valve core support ring 8. The ball valve core 33 to be ground is placed on the valve core support pad 9. The position of the ball valve core 33 is adjusted so that the through hole of the ball valve core 33 is parallel to the upper turntable 5. The pressure plate 6 is passed through the through hole of the ball valve core 33, ensuring that the pressure plate 6 fits tightly against the lower part of the through hole. Fixing screws 7 are passed through the through holes on both sides of the pressure plate 6 and the annular groove 29 around the upper turntable 5. The pressure plate 6 is adjusted so that the heights on both sides are the same, and then locked in place with nuts 11. Based on the dimensions of the ball valve core 36, install an appropriate number of grinding support frames 3 to ensure their height meets the requirements. Remove the locking nut at the lower end of the drive shaft 15 to remove the rotating shaft 16 and the grinding disc 18. Place the fixing frame 12 above the grinding support frame 3. Use the first screw 13 to pass through the through holes at the four corners of the fixing frame 12 and fix it to the threaded hole at the upper part of the grinding support frame 3. Remove the second locking nut 21, remove the grinding disc 18 from the through hole at the lower end of the rotating shaft 16, and install the counterweight 19 onto the grinding disc 18. Secure the grinding disc 18 with the first locking nut 20, then pass the upper end of the grinding disc 18 through the lower end of the rotating shaft through the hole. Install the second locking nut 21 to make it flush with the top of the upper end of the grinding disc 18 shaft. Install the grinding fixture 17 below the grinding disc 18, attach suitable grinding material, and pass the rotating shaft 16 through the oblique through hole below the drive shaft 15. Adjust the position so that the grinding fixture 17 can fit tightly against any position on the surface of the ball valve core 33. Then install the locking screw to fix the rotating shaft 16 to the drive shaft 15. Fix the first drive mechanism 35 to the hexagonal head at the front end of the worm gear 10, and fix the second drive mechanism 34 to the hexagonal head at the upper part of the drive shaft 15. Start the two drive mechanisms to make the base drive mechanism 2 and the grinding device 4 rotate at a uniform speed. Adjust the number of counterweights flexibly according to the actual grinding situation and select suitable grinding material to ensure precise control of grinding accuracy. In addition, the use of electric drive mechanism can greatly improve the working efficiency of the entire grinding device, while having good stability and being easy to carry, making it suitable for the repair of nuclear-grade ball valve cores.

[0061] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0062] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A portable nuclear-grade ball valve core grinding device, characterized in that, include: Base, base drive mechanism, grinding device and grinding support frame; The grinding support frame is fixed to the four corners of the base; The grinding device is fixedly connected to the upper part of the grinding support frame at its four corners; The base drive mechanism includes an upper turntable, a lower turntable, a guide plate, a worm gear, and a handle; the edge of the upper turntable is provided with an annular groove; The worm gear is rotatably connected to two opposing through-hole bearing seats at the bottom of the base. The gears on the lower turntable are driven by a worm gear. The guide plate is installed above the lower turntable; the upper turntable is fixed to the upper part of the lower turntable; The surface of the upper turntable is provided with several straight through slots. The clamping block slides through the straight through groove of the upper turntable and is connected to the guide groove at the upper end of the guide plate. The handle is movably connected to the protruding part on the side of the guide plate, and the screw of the handle passes through the annular groove, thereby allowing the guide plate to rotate within a fixed range; The valve core support ring is pushed to the center of the upper turntable by the clamping block and fixed, and the valve core pressure plate is fixed to the annular groove around the upper turntable; The grinding device includes a fixed frame, a bearing chamber, a drive shaft, a rotating shaft, a counterweight, a grinding disc, and a grinding fixture. The bearing chamber is fixedly connected to the upper and lower through holes of the fixed frame. The drive shaft is rotatably connected to the bearing seat in the middle of the bearing chamber. The rotating shaft is fixedly connected to the oblique through hole at the lower end of the drive shaft. The counterweight is fixedly connected to the upper connecting rod of the grinding disc. The upper connecting rod of the grinding disc is movably connected to the lower end of the rotating shaft. The grinding fixture is installed below the grinding disc.

2. The portable nuclear-grade ball valve core grinding device according to claim 1, characterized in that, The protruding part is provided with a threaded hole that passes through from top to bottom. The handle screw is threadedly connected to the threaded hole, and the guide plate and the upper turntable are fixed and locked by tightening the handle.

3. The portable nuclear-grade ball valve core grinding device according to claim 1, characterized in that, A valve core support pad is provided above the valve core support ring.

4. The portable nuclear-grade ball valve core grinding device according to claim 1, characterized in that, The counterweight consists of multiple blocks stacked on top of each other.

5. The portable nuclear-grade ball valve core grinding device according to claim 1, characterized in that, The upper and lower through holes are located near the center of the fixing frame.

6. The portable nuclear-grade ball valve core grinding device according to claim 1, characterized in that, The counterweight is fixed to the upper connecting rod of the grinding disc by a first locking nut; The top of the upper connecting rod of the grinding disc is threadedly fixed to the second locking nut.

7. The portable nuclear-grade ball valve core grinding device according to claim 1, characterized in that, One end of the worm gear is connected to the first drive mechanism.

8. The portable nuclear-grade ball valve core grinding device according to claim 1, characterized in that, The upper part of the drive shaft is connected to the second drive mechanism.

9. The portable nuclear-grade ball valve core grinding device according to claim 1, characterized in that, The height of the grinding support frame is adjustable.

10. The portable nuclear-grade ball valve core grinding device according to claim 1, characterized in that, The base has a through hole in the center, and a pulley guide rail is provided on the side wall of the through hole; A pulley assembly is fixedly connected to the bottom of the lower turntable, and the pulley assembly moves along the pulley guide rail.

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