A valve core grinding device

Abstract

This invention discloses a valve core grinding device, belonging to the field of grinding processing technology. It includes an operating table, a clamping device, and a grinding device for clamping and fixing the valve core in position and grinding the end face of the valve core. This invention uses the clamping device to hold and position the valve core, and the grinding device rotates to grind the end face of the valve core. During grinding, the rotation speed and grinding angle can be adjusted. It has both automatic and manual grinding modes, offering high grinding accuracy and easy adjustment, effectively improving efficiency, shortening grinding time, reducing the workload of workers, and the operating table is easy to assemble and disassemble, facilitating transportation and making it highly practical.

Description

Technical Field

[0001] This invention relates to the field of grinding technology, and more specifically to a valve core grinding device. Background Technology

[0002] Due to significant temperature variations in the valve medium located inside the nuclear island, valve cores are prone to defects such as penetrating scratches and spots. These defects are difficult to correct with simple equipment, often requiring considerable time for grinding. Furthermore, the repair grinding of valve cores demands high precision, especially on the sealing surface. During maintenance, the sealing surface accuracy often fails to meet requirements after grinding, and adjusting the angle during grinding is difficult, resulting in poor grinding effectiveness.

[0003] Furthermore, the main steam safety valve, as an extension of the third barrier of a nuclear power plant, is a critical and sensitive piece of equipment. The valve itself is located in the core of maintenance, resulting in a large workload and high intensity of work for operators during maintenance. When encountering valve cores with different defects, portable grinders cannot guarantee grinding accuracy, making it difficult to maintain balance and resulting in low grinding quality. This invention proposes a new solution to address the above problems. Summary of the Invention

[0004] To overcome at least one of the aforementioned drawbacks, this invention provides a valve core grinding device. The objective of this invention can be achieved by employing the following technical solution:

[0005] A valve core grinding apparatus, comprising:

[0006] Control panel;

[0007] A clamping device is used to detachably connect to the valve core to fix the position of the valve core;

[0008] A grinding device is located on the first direction side of the valve core and is used to grind the end face of the valve core in the first direction.

[0009] In one possible implementation, the clamping device includes:

[0010] A chuck, including several jaws, is used to hold or release the valve core;

[0011] A drive unit is used to drive the pawl to move in a direction that is closer to or farther from the valve core.

[0012] In one possible implementation,

[0013] The first driving mechanism is used to drive the chuck to rotate around the valve core axis.

[0014] In one possible implementation, the first drive mechanism includes a variable frequency motor.

[0015] In one possible implementation, the grinding apparatus includes:

[0016] A grinding assembly for grinding the end face of the valve core in the first direction;

[0017] A lifting bracket is used to drive the grinding assembly to move closer to or away from the valve core along the first direction;

[0018] The second drive mechanism is connected to the grinding assembly and is used to drive the grinding assembly to rotate and grind the valve core.

[0019] In one possible implementation, the grinding assembly includes:

[0020] shell;

[0021] A grinding element is disposed on the side of the housing near the valve core;

[0022] A rolling bearing is disposed between the housing and the grinding element;

[0023] A bearing cap, disposed on the housing, is used to fix the position of the rolling bearing;

[0024] A handle, located on the housing, is used to manually adjust the orientation of the grinding workpiece.

[0025] In one possible implementation, the grinding element is provided with:

[0026] The grinding surface, with an annular cross-section, is used to grind the sealing surface of the valve core;

[0027] A groove is formed on the end face of the grinding part near the valve core to accommodate the protruding part of the valve core.

[0028] In one possible implementation, the lifting support includes:

[0029] A fixing rod is provided on the operating table;

[0030] A movable rod, mounted on the fixed rod, can move along the first direction.

[0031] In one possible implementation, the second drive mechanism includes:

[0032] The movable rod is connected at one end to the grinding assembly;

[0033] A drive motor, connected to the movable rod, is used to drive the movable rod to rotate around its own axis.

[0034] In one possible implementation, the drive motor includes a stepper motor.

[0035] In one possible implementation, the grinding apparatus further includes:

[0036] An angle adjustment mechanism is used to adjust the angle of the grinding assembly.

[0037] In one possible implementation, the operating console includes:

[0038] mesa;

[0039] A support column is provided at the bottom of the tabletop to support the tabletop;

[0040] The movable wheel is located at the bottom of the support column.

[0041] In one possible implementation, the driving device includes:

[0042] A clamping drive mechanism is connected to the chuck;

[0043] The lifting drive mechanism is connected to the aforementioned lifting bracket.

[0044] In one possible implementation, the operating platform is provided with:

[0045] An operation panel is connected to the first drive mechanism, the second drive mechanism, and the lifting drive mechanism;

[0046] An operating pedal is connected to the clamping drive mechanism.

[0047] The beneficial technical effects of the present invention are as follows: According to the present disclosure, the valve core grinding equipment uses a clamping device to hold and position the valve core, and the grinding device rotates to grind the end face of the valve core. During grinding, the rotation speed and grinding angle can be adjusted. It has two modes: automatic grinding and manual grinding. The grinding accuracy is good and easy to adjust, which can effectively improve efficiency, shorten the grinding time, reduce the workload of workers, and the operating table and various parts are easy to disassemble and assemble, convenient to transport, highly practical, and low in cost. Attached Figure Description

[0048] The following are given by way of example and without limitation in the accompanying drawings:

[0049] Figure 1 A schematic diagram of the overall structure of the present invention is shown;

[0050] Figure 2 A schematic diagram of the clamping device and grinding device of the present invention is shown;

[0051] Figure 3 A front view of the overall structure of the present invention is shown;

[0052] Figure 4 A right view of the overall structure of the present invention is shown;

[0053] Figure 5A schematic diagram of the operating table structure of the present invention is shown;

[0054] Figure 6 A schematic diagram of the operating pedal structure of the present invention is shown;

[0055] Figure 7 A schematic diagram of the third driving device of the present invention is shown;

[0056] Figure 8 A schematic diagram of the grinding apparatus of the present invention is shown;

[0057] Figure 9 A schematic diagram of the lifting bracket and the second drive mechanism of the present invention is shown.

[0058] Figure 10 A schematic diagram of the grinding assembly structure of the present invention is shown;

[0059] Figure 11 A cross-sectional view of the grinding assembly structure of the present invention is shown;

[0060] Figure 12 A schematic diagram of the clamping device structure of the present invention is shown;

[0061] Figure 13 A schematic diagram of the valve core structure of the present invention is shown.

[0062] In the picture:

[0063] 1. Control panel;

[0064] 11. Countertop; 12. Support column; 13. Casters;

[0065] 2. Clamping device; 21. Chuck; 22. First drive mechanism;

[0066] 3. Grinding device; 31. Grinding assembly; 32. Lifting bracket; 33. Second drive mechanism; 34. Angle adjustment mechanism;

[0067] 311. Housing; 312. Grinding part; 313. Rolling bearing; 314. Bearing cap; 315. Handle;

[0068] 321. Fixed rod; 322. Movable rod;

[0069] 331. Drive motor; 332. Connecting rod;

[0070] 4. Drive unit; 5. Valve core; 6. Control panel; 7. Control pedal. Detailed Implementation

[0071] In the following detailed disclosure, reference is made to the accompanying drawings, which illustrate specific embodiments that can be implemented. These embodiments are fully described by way of illustrations, which are part of the features. In order to enable those skilled in the art to understand and clarify the technical solution of the present invention more clearly, the embodiments described below are not limited thereto. The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0072] like Figure 1 As shown, a valve core grinding device includes:

[0073] Control panel 1;

[0074] The clamping device 2 is set on the operating table 1 and is used to detachably connect to the valve core 5 to fix the position of the valve core 5.

[0075] The grinding device 3 is set on the operating table 1 and located on the first direction side of the valve core 5, and is used to grind the end face of the valve core 5 in the first direction.

[0076] In practice, the valve core 5 is clamped and positioned by the clamping device 2, and the end face of the valve core 5 is ground by the rotation of the grinding device 3, which can effectively shorten the grinding time and reduce the labor intensity of the workers.

[0077] The operating table 1 is low-cost and easy to disassemble and assemble. The clamping device 2 and grinding device 3 are easy and simple to operate, and highly practical. During maintenance, it can perform large-scale grinding, improve work efficiency, and shorten working time.

[0078] like Figures 2-4 As shown, in one possible embodiment, the clamping device 2 includes:

[0079] The chuck 21 includes several jaws for clamping or releasing the valve core 5;

[0080] Drive unit 4 is used to drive the pawl to move in a direction close to or away from the valve core 5.

[0081] like Figure 12 As shown, the number of jaws is at least 3, which can effectively clamp the valve core 5 and position the valve core 5 to facilitate subsequent grinding. Generally, a three-jaw chuck is selected to restrict six degrees of freedom from three directions, ensuring that the valve core 5 is in a stable position during grinding, thereby improving the grinding accuracy.

[0082] In practice, the drive device 4 drives several jaws on the chuck 21 to move towards the valve core 5 along the radial direction of the valve core 5. When the jaws abut against the outer wall of the valve core 5, the valve core 5 is clamped, ensuring the stability of the valve core 5 during the grinding process.

[0083] In one possible implementation, a first drive mechanism 22 is used to drive the chuck 21 to rotate around the axis of the valve core 5.

[0084] In specific implementation, the valve core 5 can be rotated by the first drive mechanism 22. First, the valve core 5 is clamped and positioned by the clamping device 2 so that the axis of the valve core 5 coincides with the axis of the chuck 21. Thus, when the first drive mechanism 22 drives the valve core 5 to rotate, the axis of the valve core 5 coincides with the center line of the valve core 5 rotation, so that the valve core 5 can rotate around its own axis.

[0085] In one possible implementation, the first drive mechanism 22 includes a variable frequency motor.

[0086] In practical implementation, under standard environmental conditions, taking continuous operation at 10%-100% rated speed with 100% rated load as an example, the temperature rise of the motor will not exceed the rated allowable value of the motor. The variable frequency motor can achieve different speeds and torques under the drive of the frequency converter to adapt to changes in load requirements.

[0087] Compared to ordinary motors, variable frequency (VFD) motors have enhanced slot insulation. This is achieved through both stronger insulation materials and increased slot insulation thickness, improving their ability to withstand high-frequency voltages. Ordinary motors operate near their magnetic saturation inflection point; using them for VFD applications can easily lead to saturation and higher excitation currents. VFD motors, however, increase the electromagnetic load, making the magnetic circuit less prone to saturation. Furthermore, VFD motors are generally categorized into constant torque dedicated motors, dedicated motors with feedback vector control and speed measurement devices, and medium-frequency motors. Other types of motors can achieve higher torque than VFD motors, but their costs are also relatively higher. Therefore, when torque requirements are met, VFD motors are the preferred choice.

[0088] like Figure 8 As shown, in one possible embodiment, the grinding apparatus 3 includes:

[0089] The grinding assembly 31 is used to grind the end face of the valve core 5 in the first direction;

[0090] The lifting bracket 32 ​​is used to drive the grinding assembly 31 to move closer to or further away from the valve core 5 along a first direction;

[0091] The second drive mechanism 33 is connected to the grinding assembly 31 and is used to drive the grinding assembly 31 to rotate the grinding valve core 5.

[0092] In practice, the lifting bracket 32 ​​drives the grinding component 31 to approach the valve core 5 along the first direction until the grinding component 31 abuts against the end face of the valve core 5 to be ground and rotates to grind the end face of the valve core 5. At the same time, the lifting bracket 32 ​​drives the grinding component 31 to gradually squeeze the valve core 5, increasing the grinding feed, which is more suitable for repairing major defects in the valve core 5.

[0093] The second drive mechanism 33 drives the grinding assembly 31 to rotate. The grinding assembly 31 abuts against the end face of the valve core 5 to be ground and rotates to grind the end face of the valve core 5.

[0094] The grinding action can be achieved by the relative rotation of the valve core 5 and the grinding assembly 31. In specific implementation, there are three grinding methods to choose from:

[0095] First, the first drive mechanism 22 drives the valve core 5 to rotate, while the grinding assembly 2 does not rotate;

[0096] Secondly, the second drive mechanism 33 drives the grinding assembly 2 to rotate, while the valve core 5 does not rotate;

[0097] Third, the first drive mechanism 22 drives the valve core 5 to rotate, and the second drive mechanism 33 drives the grinding assembly 2 to rotate. The two drive mechanisms rotate in different directions, or in the same direction but at different speeds.

[0098] like Figure 10 As shown, in one possible embodiment, the grinding assembly 31 includes:

[0099] Casing 311;

[0100] The grinding element 312 is disposed on the side of the housing 311 near the valve core 5;

[0101] A rolling bearing 313 is disposed between the housing 311 and the grinding element 312;

[0102] The bearing cap 314 is mounted on the housing 311 and is used to fix the position of the rolling bearing 313;

[0103] A handle 315, mounted on the housing 311, is used to manually adjust the orientation of the grinding piece 312.

[0104] It is understood that the grinding element 312 is connected to the second drive mechanism 33, and the grinding element 312 and the outer shell 311 are rotatably connected through the rolling bearing 313. Therefore, the outer shell 311 does not rotate synchronously with the grinding element 312, and thus the outer shell 311 can be rotated at different times during the rotation of the grinding element 312.

[0105] like Figure 3 , Figure 11 As shown, in one possible embodiment, the grinding element 312 is provided with:

[0106] The grinding surface, with an annular cross-section, is used to grind the sealing surface of valve core 5;

[0107] A groove is formed on the end face of the grinding part 312 near the valve core 5 to accommodate the protruding part of the valve core 5.

[0108] like Figure 13As shown, since the sealing surface of valve core 5 is annular, the annular sealing surface is not easy to grind, which makes it difficult to achieve the required grinding accuracy. Furthermore, it is not convenient to adjust the grinding angle by hand, resulting in poor grinding effect.

[0109] Therefore, in the embodiments of this application, the grinding surface is set as an annular shape corresponding to the sealing surface of the valve core 5. During grinding, the grinding surface and the sealing surface of the valve core 5 are in contact, and the inner diameter of the grinding surface is smaller than the inner diameter of the sealing surface of the valve core 5, while the outer diameter of the grinding surface is larger than the outer diameter of the sealing surface of the valve core 5, so that the sealing surface of the valve core 5 can be fully ground. At the same time, valve core 5 sealing surfaces whose dimensions meet the above requirements can be ground by this grinding surface, which can be used for valve cores 5 with a certain range of diameters. If the grinding part 312 with a different size grinding surface is replaced, valve cores 5 with a wider range of diameters can be used.

[0110] like Figure 9 As shown, in one possible implementation, the lifting bracket 32 ​​includes:

[0111] Fixed rod 321 is installed on the operating table 1;

[0112] The movable rod 322 is mounted on the fixed rod 321 and can move along the first direction.

[0113] In practice, the fixed rod 321 is detachably installed on the table surface of the operating table 1, and the movable rod 322 moves along the fixed rod 321 to achieve the function of driving the grinding assembly 31 closer to or away from the valve core 5 along the first direction.

[0114] In one possible implementation, the second drive mechanism 33 includes:

[0115] The movable rod 322 is connected at one end to the grinding assembly 31;

[0116] The drive motor 331 is connected to the movable rod 322 and is used to drive the movable rod 322 to rotate around its own axis.

[0117] In practice, the drive motor 331 drives the movable rod 322 to rotate, which in turn drives the grinding part 312 to rotate for automatic grinding.

[0118] In one possible implementation, the drive motor 331 includes a stepper motor.

[0119] A stepper motor's rotation angle is proportional to the number of pulses. It has maximum torque when stopped. Because the accuracy of each step is 3%–5%, and errors from one step do not accumulate to the next, it offers good positional accuracy and motion repeatability, excellent start-stop and reverse response, and high reliability due to the absence of brushes. The stepper motor's response is determined solely by digital input pulses, allowing for open-loop control. This simplifies the stepper motor's structure and reduces control costs; even a very low-speed synchronous rotation can be achieved by simply connecting the load directly to the motor shaft.

[0120] Since the speed is proportional to the pulse frequency, it has a relatively wide speed range. The servo motor achieves feedback control by installing a rotary encoder inside. The torque that the servo motor can achieve is higher than that of the stepper motor. However, the cost of the servo motor is higher. Therefore, if the torque requirement is met, the stepper motor is preferred.

[0121] like Figure 9 As shown, in one possible embodiment, the grinding device 3 further includes:

[0122] Angle adjustment mechanism 34 is used to adjust the angle of grinding assembly 31.

[0123] By setting the angle adjustment mechanism 34, two modes of automatic grinding and manual grinding can be realized. The angle of the grinding part 312 can be adjusted by the angle adjustment mechanism 34 to achieve a different grinding angle than automatic grinding.

[0124] In practice, the angle adjustment mechanism 34 uses a universal joint. The angle of the outer shell 311 is adjusted by the handle 315 to adjust the angle of the grinding surface. At this time, the rotating valve core 5 is in contact with the grinding surface for grinding. The grinding force and angle can be manually controlled.

[0125] Understandably, the universal joint is mounted on the movable rod 322 to adjust the angle of the grinding part 312.

[0126] like Figure 5 As shown, in one possible implementation, the control panel 1 includes:

[0127] Countertop 11;

[0128] Support column 12 is set at the bottom of tabletop 11 to support tabletop 11;

[0129] The movable wheel 13 is located at the bottom of the support column 12.

[0130] The tabletop 11, support column 12 and caster 13 are all detachably connected. The clamping device 2 and grinding device 3 can also be detachably installed on the operating table 1. The operating table 1 is easy to disassemble and install, can be better adapted to various sites, is easy to move, and the parts are relatively lightweight and easy to disassemble and assemble, making it easy to transport.

[0131] like Figure 7 As shown, in one possible implementation, the drive device 4 includes:

[0132] A clamping drive mechanism is connected to the chuck 21;

[0133] The lifting drive mechanism is connected to the aforementioned lifting bracket 32.

[0134] In specific implementation, the drive device 4 is preferably a hydraulic station. The hydraulic actuator moves quickly and is easy to start, brake, and reverse at high speeds. Simultaneously, the hydraulic actuator is smaller and lighter, provides smooth drive, has strong anti-interference capabilities, and particularly good low-speed performance. Compared to mechanical and electrical systems, which are less smooth to operate and susceptible to electromagnetic waves and other external interference, the hydraulic actuator offers high power within its speed range. Therefore, the hydraulic station is preferred for controlling the chuck 21 to clamp the valve core 5 and for driving the movable rod 322 of the lifting bracket 32 ​​to move along the first direction.

[0135] like Figure 2 , Figure 5 and Figure 6 As shown, in one possible implementation, the control panel 1 is provided with:

[0136] The operation panel 6 is connected to the first drive mechanism 22, the second drive mechanism 33, and the lifting drive mechanism;

[0137] Operating pedal 7 is connected to the clamping drive mechanism.

[0138] In practice, the control panel 6 is set on the table 11 for easy operation. The control panel 6 controls the first drive mechanism 22, the second drive mechanism 33 and the lifting drive mechanism, specifically to start or stop the rotation of the grinding workpiece 312 and adjust the speed, start or stop the rotation of the valve core 5 and adjust the speed, and drive the movable rod 322 of the lifting bracket 32 ​​to move.

[0139] In practice, the operating pedal 7 is set at a low position on the operating table 1 so that it can be operated by the operator's feet. The clamping drive mechanism is activated by the operating pedal 7 to drive the chuck 21 to clamp the valve core 5.

[0140] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0141] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0142] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0143] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0144] In view of the detailed description above, these and other changes can be made to these embodiments, and this written description includes embodiments of the best mode that disclose the invention. The patent scope of the invention is defined by the claims, which are not limited by this disclosure. The scope of protection of the invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the invention disclosed herein, based on the technical solutions and concepts of the invention, are within the scope of protection of the invention.

Claims

1. A valve core grinding device, characterized in that, include: Control panel (1); A clamping device (2) is used to be detachably connected to the valve core (5) to fix the position of the valve core (5); A grinding device (3) is located on the first direction side of the valve core (5) and is used to grind the end face of the valve core (5) in the first direction. The grinding device (3) includes a grinding assembly (31), a lifting bracket (32), and a second driving mechanism (33). The grinding assembly (31) is used to grind the end face of the valve core (5) in the first direction. The lifting bracket (32) is used to drive the grinding assembly (31) to move closer to or away from the valve core (5) along the first direction. The second driving mechanism (33) is connected to the grinding assembly (31) and is used to drive the grinding assembly (31) to rotate and grind the valve core (5). The grinding assembly (31) includes a housing (311), a grinding element (312), a rolling bearing (313), a bearing cap (314), and a grinding wheel. The handle (315) is provided on the side of the housing (311) near the valve core (5). The rolling bearing (313) is provided between the housing (311) and the grinding part (312). The bearing cap (314) is provided on the housing (311) for fixing the position of the rolling bearing (313). The handle (315) is provided on the housing (311) for manually adjusting the direction of the grinding part (312). The grinding part (312) is provided with a grinding surface and a groove. The cross-section of the grinding surface is annular for grinding the sealing surface of the valve core (5). The groove is opened on the end face of the grinding part (312) near the valve core (5) for accommodating the protruding part of the valve core (5).

2. The valve core grinding equipment according to claim 1, characterized in that, The clamping device (2) includes: The chuck (21) includes several jaws for clamping or releasing the valve core (5); A drive unit (4) is used to drive the pawl to move in a direction close to or away from the valve core (5).

3. The valve core grinding equipment according to claim 2, characterized in that, The first drive mechanism (22) is used to drive the chuck (21) to rotate around the axis of the valve core (5).

4. The valve core grinding equipment according to claim 1, characterized in that, The lifting support (32) includes: A fixing rod (321) is provided on the operating table (1); The movable rod (322) is mounted on the fixed rod (321) and can move along the first direction.

5. The valve core grinding equipment according to claim 1, characterized in that, The second drive mechanism (33) includes: The movable rod (322) is connected at one end to the grinding assembly (31); A drive motor (331) is connected to the movable rod (322) and is used to drive the movable rod (322) to rotate around its own axis.

6. The valve core grinding equipment according to claim 1, characterized in that, The grinding device (3) further includes: An angle adjustment mechanism (34) is used to adjust the angle of the grinding assembly (31).

7. The valve core grinding equipment according to claim 1, characterized in that, The operating console (1) includes: Countertop (11); A support column (12) is provided at the bottom of the tabletop (11) to support the tabletop (11); A movable wheel (13) is provided at the bottom of the support column (12).

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