A planetary safety valve seal face grinder

Abstract

The application belongs to the technical field of grinding devices, and adopts the technical scheme as follows: a planetary safety valve sealing surface grinding machine, which comprises a valve seat, an eccentric grinding device arranged on the valve seat, a base plate, an X-axis displacement mechanism, a connecting mechanism, a Y-axis displacement mechanism and an eccentric grinding mechanism, the base plate is connected to the upper end surface of the valve seat through a fixing piece, the X-axis displacement mechanism is arranged on the base plate, the connecting mechanism is in transmission connection with the X-axis displacement mechanism, the Y-axis displacement mechanism is connected to the connecting mechanism through a clamp, and the eccentric grinding mechanism is arranged on the Y-axis displacement mechanism; the eccentric grinding of the eccentric grinding mechanism improves the grinding precision and automatically compensates the wear; during the grinding process, the grinding disc and the abrasive continuously wear, the counterweight automatically falls and follows up under the action of gravity, manual adjustment of the threaded distance is not needed, and the grinding work surface is kept in effective contact with the sealing surface of the valve seat at all times.

Description

Technical Field

[0001] This invention belongs to the technical field of grinding devices, and particularly relates to a planetary safety valve sealing surface grinding machine. Background Technology

[0002] Because the sealing surface of a safety valve is a pressure-bearing and important working part during operation, it may develop defects such as indentations, scratches, rust, pitting, and cracks. Therefore, the sealing surface of the safety valve must be ground and repaired during maintenance. Currently, the grinding of safety valve sealing surfaces is mainly done manually. However, if the sealing surface is severely damaged, the amount of manual grinding work will be very large, the efficiency will be low, and the accuracy will be poor. To address the above issues, we propose a planetary safety valve sealing surface grinding machine. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a planetary safety valve sealing surface grinding machine, which solves the problems of low efficiency and poor precision of manual grinding in the prior art.

[0004] The technical solution adopted in this invention is as follows: a planetary safety valve sealing surface grinding machine, including a valve seat, on which an eccentric grinding device is provided; The eccentric grinding device includes a base plate, an X-axis displacement mechanism, a connecting mechanism, a Y-axis displacement mechanism, and an eccentric grinding mechanism. The base plate is connected to the upper surface of the valve seat by a fixing member. The X-axis displacement mechanism is located on the base plate. The connecting mechanism is connected to the X-axis displacement mechanism by transmission. The Y-axis displacement mechanism is connected to the connecting mechanism by a clamp. The eccentric grinding mechanism is located on the Y-axis displacement mechanism.

[0005] As a preferred technical solution of this invention, the X-axis displacement mechanism includes a U-shaped seat and a threaded rod. The U-shaped seat is fixedly connected to the base plate, and the threaded rod is rotatably connected to the U-shaped seat.

[0006] As a preferred technical solution of this invention, the connecting mechanism includes a sliding block and a connecting column. The sliding block is threadedly connected to the threaded rod. A guide column is fixedly connected to the U-shaped seat. The sliding block is movably connected to the guide column. The connecting column is fixedly connected to the sliding block.

[0007] As a preferred technical solution of this invention, the Y-axis displacement mechanism includes an L-shaped plate, a guide rod, and a movable plate. The L-shaped plate is connected to the connecting column by a clamp, the guide rod is fixedly connected to the L-shaped plate, and the movable plate is movably connected to the guide rod in an up-down motion.

[0008] As a preferred technical solution of this invention, the eccentric grinding mechanism includes a drive motor, an eccentric wheel mechanism, and a planetary gear grinding disc. The drive motor is fixedly connected to the moving plate, and the eccentric wheel mechanism is connected to the output end of the drive motor. The eccentric wheel mechanism extends into the center of the planetary gear grinding disc.

[0009] As a preferred technical solution of this invention, the eccentric wheel mechanism includes a rotating shaft, a connecting disc, a connecting shaft, an eccentric disc, and an eccentric shaft. The rotating shaft is fixedly connected to the output end of the drive motor. The connecting disc is coaxially fixedly connected to the rotating shaft. The connecting shaft is eccentrically fixedly connected to the lower end face of the connecting disc. The eccentric disc is concentrically fixedly connected to the connecting shaft. The eccentric shaft is eccentrically fixedly connected to the eccentric disc. The lower end of the eccentric shaft extends concentrically to the center end of the planetary gear grinding disc.

[0010] As a preferred technical solution of this invention, the fastener includes a bolt rod and a pressure plate. The bolt rod is threadedly connected to the valve seat, and the pressure plate is sleeved on the surface of the bolt rod and pressed against the base plate.

[0011] As a preferred technical solution of this invention, a heavy block is connected to the moving plate.

[0012] The beneficial effects of the present invention after adopting the above structure are as follows: (1) The X-axis displacement mechanism facilitates the position adjustment of the eccentric grinding mechanism in the X-axis direction; (2) Improve grinding accuracy through eccentric grinding mechanism; (3) Automatic wear compensation: During the grinding process, the grinding disc and abrasive are continuously worn. The counterweight falls automatically and follows the wear due to gravity. There is no need to stop the machine and manually adjust the thread distance, ensuring that the grinding working surface always maintains effective contact with the valve seat sealing surface. (4) Constant and controllable grinding pressure: When the thread is rigidly tightened, excessive pressure can easily cause the grinding disc to vibrate, resulting in spiral marks or vibration marks on the sealing surface. If the pressure is too low, the cutting force will be insufficient and the defect elimination efficiency will be low. The counterweight pressurization applies constant gravity to the grinding disc, and the pressure is uniform and stable, avoiding the pressure fluctuation problem of rigid tightening. (5) Adaptive: The counterweight mechanism can adaptively adjust in real time according to the macroscopic undulations of the sealing surface and the dimensional changes during the grinding process, ensuring that the grinding pressure remains consistent throughout the entire operation cycle and improving the flatness and roughness consistency of the sealing surface grinding. (6) The fasteners facilitate the eccentric grinding mechanism to be adapted and installed on valve seats of different diameters. Attached Figure Description

[0013] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the invention and do not constitute a limitation thereof.

[0014] Figure 1 The present invention proposes a structure for a planetary safety valve sealing surface grinding machine. Figure 1 ; Figure 2 The present invention proposes a structure for a planetary safety valve sealing surface grinding machine. Figure 2 ; Figure 3 The present invention proposes a structure for a planetary safety valve sealing surface grinding machine. Figure 3 ; Figure 4 The present invention proposes a structure for a planetary safety valve sealing surface grinding machine. Figure 4 ; Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle; Figure 6 This is a structural diagram of the eccentric wheel rod mechanism of a planetary safety valve sealing surface grinding machine proposed in this invention; Figure 7 For the present invention Figure 4 Enlarged view of point A in the middle; In the attached diagram: 1. Valve seat; 2. Eccentric grinding device; 3. Base plate; 4. X-axis displacement mechanism; 5. Connecting mechanism; 6. Y-axis displacement mechanism; 7. Eccentric grinding mechanism; 8. Clamp; 9. U-shaped seat; 10. Threaded rod one; 11. Sliding block; 12. Connecting column; 13. Guide column; 14. L-shaped plate; 15. Guide rod; 16. Moving plate; 17. Drive motor; 18. Eccentric wheel rod mechanism; 19. Planetary gear grinding disc; 20. Rotating shaft; 21. Connecting disc; 22. Connecting shaft; 23. Eccentric disc; 24. Eccentric shaft; 25. Bolt rod; 26. Pressure plate; 27. Weight block. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0016] like Figures 1 to 7As shown, this invention provides a planetary safety valve sealing surface grinding machine, including a valve seat 1 with an eccentric grinding device 2 mounted on it. The valve seat 1 is the valve body seat component of the safety valve, and its upper inner surface forms an annular sealing surface. This sealing surface is prone to defects such as indentations, scratches, corrosion, pitting, and cracks after long-term use, requiring repair through grinding. The eccentric grinding device 2 is mounted on the valve seat 1 and is used for mechanized grinding of the sealing surface inside the valve seat 1, replacing traditional manual grinding and improving grinding efficiency and precision.

[0017] The eccentric grinding device 2 includes a base plate 3, an X-axis displacement mechanism 4, a connecting mechanism 5, a Y-axis displacement mechanism 6, and an eccentric grinding mechanism 7. The base plate 3 is a flat plate with a through hole in its middle for the eccentric grinding mechanism 7 to extend into. The base plate 3 is connected to the upper flange of the valve seat 1 by a fastener, providing an installation base and support platform for the entire eccentric grinding device 2. The X-axis displacement mechanism 4 is located on the upper surface of the base plate 3 and is used to drive the connecting mechanism 5 and its connected subsequent components to make horizontal linear displacement along the X-axis direction, thereby adjusting the lateral position of the eccentric grinding mechanism 7 on the horizontal plane so that the planetary gear grinding disc 19 can be aligned with different radial positions of the sealing surface of the valve seat 1. The connecting mechanism 5 is connected to the X-axis displacement mechanism 4 and moves along the X-axis direction under the drive of the X-axis displacement mechanism 4. The Y-axis displacement mechanism 6 is connected to the connecting mechanism 5 by a clamp 8. The clamp 8 can be loosened or locked. When loosened, the Y-axis displacement mechanism 6 can move up and down along the vertical direction of the connecting mechanism 5 to adjust its height. When locked, the Y-axis displacement mechanism 6 is fixed to the connecting mechanism 5 as one unit. The eccentric grinding mechanism 7 is mounted on the Y-axis displacement mechanism 6 and is used to generate planetary grinding motion and perform actual grinding operations on the sealing surface of the valve seat 1.

[0018] The X-axis displacement mechanism 4 includes a U-shaped seat 9 and a threaded rod 10. The U-shaped seat 9 has a U-shaped groove structure, and its bottom is fixed to the upper surface of the base plate 3 by screws or welding. Bearing holes are provided on the two side walls of the U-shaped seat 9 to support the threaded rod 10. The threaded rod 10 is a long externally threaded rod, with both ends rotatably connected to the two side walls of the U-shaped seat 9 via bearings. One end of the threaded rod 10 extends beyond the side wall of the U-shaped seat 9 and is connected to a knob or handwheel for easy manual rotation. When the threaded rod 10 is rotated, the sliding block 11 that cooperates with it moves along the axial direction of the threaded rod 10 through threaded transmission, thereby achieving position adjustment in the X-axis direction.

[0019] The connecting mechanism 5 includes a sliding block 11 and a connecting post 12. The sliding block 11 is a block-shaped component with an internal threaded hole that mates with the threaded rod 10. The sliding block 11 is threadedly connected to the threaded rod 10 through this internal threaded hole. Simultaneously, the sliding block 11 also has a smooth guide hole, through which the guide post 13 passes, allowing the sliding block 11 and the guide post 13 to be movably connected. The guide post 13 is a smooth cylindrical rod with both ends fixedly connected to the two side walls of the U-shaped seat 9. The guide post 13 is arranged parallel to the threaded rod 10. When the threaded rod 10 rotates, the sliding block 11 tends to rotate with the threaded rod 10 under the action of the threaded driving force. However, the guide post 13, passing through the guide hole of the sliding block 11, forms a circumferential limit on the sliding block 11, preventing the sliding block 11 from rotating. This converts the rotational motion of the threaded rod 10 into linear motion of the sliding block 11 along the axis of the guide post 13. The connecting column 12 is a vertically arranged cylindrical rod, the lower end of which is fixedly connected to the upper surface of the sliding block 11. The connecting column 12 moves together with the sliding block 11 along the X-axis.

[0020] The Y-axis displacement mechanism 6 includes an L-shaped plate 14, a guide rod 15, and a movable plate 16. The L-shaped plate 14 is formed by vertically connecting a vertical plate and a horizontal plate, forming an L-shaped cross-section. The L-shaped plate 14 is clamped and fixed to the connecting column 12 by a clamp 8. When the clamp 8 is loosened, the L-shaped plate 14 can slide up and down along the axis of the connecting column 12, thereby adjusting the height of the entire Y-axis displacement mechanism 6 and the eccentric grinding mechanism 7 to adapt to the sealing surface height of valve seats 1 of different specifications. After adjustment, the clamp 8 is locked to fix the L-shaped plate 14 to the connecting column 12. The guide rod 15 is a smooth vertical cylindrical rod, the upper end of which is fixedly connected to the lower surface of the horizontal plate of the L-shaped plate 14, and the guide rod 15 extends vertically downward. The movable plate 16 is a horizontally arranged flat plate with a smooth guide hole that mates with the guide rod 15. The guide rod 15 passes through the guide hole, allowing the movable plate 16 and the guide rod 15 to move up and down in a movable connection. The movable plate 16 can slide freely up and down along the axis of the guide rod 15. The guide rod 15 guides and limits the movable plate 16, ensuring that the movable plate 16 always remains horizontal and does not tilt. The up and down sliding of the movable plate 16 allows the eccentric grinding mechanism 7 fixed on it to float up and down together with the movable plate 16. During the grinding process, the gravity of the movable plate 16 and its components acts on the sealing surface of the valve seat 1 through the planetary gear grinding disc 19, providing the positive pressure required for grinding.

[0021] The eccentric grinding mechanism 7 includes a drive motor 17, an eccentric wheel mechanism 18, and a planetary gear grinding disc 19. The drive motor 17 provides rotational power for the grinding operation, and its body is fixedly connected to the upper surface of the moving plate 16. The output shaft of the drive motor 17 passes vertically downward through a through hole in the moving plate 16. The eccentric wheel mechanism 18 is connected to the output end of the drive motor 17; that is, the upper end of the eccentric wheel mechanism 18 is fixedly connected to the output shaft of the drive motor 17. When the drive motor 17 operates, it drives the eccentric wheel mechanism 18 to rotate together. The eccentric wheel mechanism 18 extends downward and through the through hole in the middle of the base plate 3, extending into the internal cavity of the valve seat 1. The lower end of the eccentric wheel mechanism 18 extends into the center of the planetary gear grinding disc 19. The planetary gear grinding disc 19 is a disc-shaped component with its lower end surface serving as the grinding working surface. Abrasive powder or sandpaper can be applied to this surface. The planetary gear grinding disc 19 is horizontally positioned above the sealing surface inside the valve seat 1, with its lower grinding surface in contact with the sealing surface of the valve seat 1. The rotational motion output by the drive motor 17 is converted into the rotation of the planetary gear grinding disc 19 via the eccentric wheel mechanism 18, thereby achieving efficient and high-precision grinding of the sealing surface.

[0022] The eccentric wheel mechanism 18 includes a rotating shaft 20, a connecting plate 21, a connecting shaft 22, an eccentric disk 23, and an eccentric shaft 24. The rotating shaft 20 is a short shaft with a connecting hole (such as an internal hexagonal hole or keyway) at its upper end to mate with the output shaft of the drive motor 17. The rotating shaft 20 is fixedly connected to the output end of the drive motor 17 through this connecting hole. The connecting plate 21 is a disc with a shaft hole at its center. The lower end of the rotating shaft 20 passes through this shaft hole and is coaxially fixedly connected to the connecting plate 21 via a key connection, allowing the connecting plate 21 to rotate around the axis of the rotating shaft 20 along with it. The connecting shaft 22 is a long cylindrical rod. Its upper end is eccentrically fixed to the lower end face of the connecting plate 21, that is, the axis of the connecting shaft 22 is parallel to but does not coincide with the axis of the rotating shaft 20. When the connecting plate 21 rotates with the rotating shaft 20, the connecting shaft 22 makes a circular motion around the axis of the rotating shaft 20, that is, it revolves. The eccentric plate 23 is concentrically fixed to the connecting shaft 22, and the eccentric shaft 24 is eccentrically fixed to the eccentric plate 23. The lower end of the eccentric shaft 24 extends concentrically to the center end of the planetary gear grinding plate 19 to grind the sealing surface of the valve seat 1.

[0023] The fasteners include a bolt rod 25 and a pressure plate 26. The bolt rod 25 is a long, externally threaded rod. A threaded hole is provided on the upper flange surface of the valve seat 1 to mate with the bolt rod 25. The lower end of the bolt rod 25 is screwed into this threaded hole, forming a threaded connection with the valve seat 1. The upper end of the bolt rod 25 extends upwards. The pressure plate 26 is a long, strip-shaped plate with a clear hole. The pressure plate 26 is fitted onto the surface of the bolt rod 25 through this hole, with its lower surface pressing against the upper surface of the base plate 3. A nut is screwed onto the upper end of the bolt rod 25. When the nut is tightened, it presses the pressure plate 26 downwards, which in turn presses the base plate 3 firmly onto the upper flange surface of the valve seat 1, thus achieving a detachable and fixed connection between the base plate 3 and the valve seat 1. This fixing method using the bolt rod 25 and pressure plate 26 is simple in structure, easy to assemble and disassemble, and can firmly press the base plate 3 onto the valve seat 1, preventing displacement or vibration of the base plate 3 during grinding and ensuring grinding accuracy. Meanwhile, this fixing method is applicable to valve seats 1 of different specifications. It only requires adjusting the installation position of the bolt rod 25 on the flange surface of the valve seat 1, making it highly versatile.

[0024] A weight block 27 is connected to the movable plate 16. The weight block 27 is a block-shaped component with a certain weight, which is fixed to the upper surface of the movable plate 16 by bolts. The function of the weight block 27 is to increase the overall weight of the movable plate 16 and the eccentric grinding mechanism 7, thereby increasing the positive pressure of the planetary gear grinding disc 19 pressing against the sealing surface of the valve seat 1. During the grinding process, the moving plate 16 slides freely downward along the guide rod 15. The total weight of the moving plate 16, drive motor 17, eccentric wheel mechanism 18, planetary gear grinding disc 19, and weight block 27 acts on the sealing surface of valve seat 1 through the grinding surface of planetary gear grinding disc 19, forming the contact pressure required for grinding, so as to achieve the effect of wear self-compensation. During the grinding process, the planetary gear grinding disc and abrasive are continuously worn. The counterweight falls automatically and follows up with gravity, without the need to stop the machine and manually adjust the thread distance, ensuring that the grinding working surface always maintains effective contact with the valve seat sealing surface, and ensuring that the pressure is uniform and stable, avoiding the pressure fluctuation problem of rigid pressing, and achieving the effect of follow-up self-adaptation: the counterweight mechanism can adaptively adjust in real time according to the macroscopic undulation of the sealing surface and the dimensional changes during the grinding process, ensuring that the grinding pressure remains consistent throughout the entire operation cycle, and improving the flatness and roughness consistency of the valve seat 1 sealing surface grinding.

[0025] If a person skilled in the art, inspired by this invention, designs a similar structure and embodiment without departing from the spirit of the invention, such design should fall within the scope of protection of this invention.

Claims

1. A planetary safety valve sealing surface grinding machine, comprising a valve seat (1), characterized in that: An eccentric grinding device (2) is provided on the valve seat (1); The eccentric grinding device (2) includes a base plate (3), an X-axis displacement mechanism (4), a connecting mechanism (5), a Y-axis displacement mechanism (6), and an eccentric grinding mechanism (7). The base plate (3) is connected to the upper surface of the valve seat (1) by a fixing member. The X-axis displacement mechanism (4) is located on the base plate (3). The connecting mechanism (5) is connected to the X-axis displacement mechanism (4) by transmission. The Y-axis displacement mechanism (6) is connected to the connecting mechanism (5) by a clamp (8). The eccentric grinding mechanism (7) is located on the Y-axis displacement mechanism (6).

2. The planetary safety valve sealing surface grinding machine according to claim 1, characterized in that: The X-axis displacement mechanism (4) includes a U-shaped seat (9) and a threaded rod (10). The U-shaped seat (9) is fixedly connected to the base plate (3), and the threaded rod (10) is rotatably connected to the U-shaped seat (9).

3. A planetary safety valve sealing surface grinding machine according to claim 2, characterized in that: The connecting mechanism (5) includes a sliding block (11) and a connecting column (12). The sliding block (11) is threadedly connected to the threaded rod (10). A guide column (13) is fixedly connected to the U-shaped seat (9). The sliding block (11) is movably connected to the guide column (13). The connecting column (12) is fixedly connected to the sliding block (11).

4. A planetary safety valve sealing surface grinding machine according to claim 3, characterized in that: The Y-axis displacement mechanism (6) includes an L-shaped plate (14), a guide rod (15), and a movable plate (16). The L-shaped plate (14) is connected to the connecting column (12) by a clamp (8). The guide rod (15) is fixedly connected to the L-shaped plate (14). The movable plate (16) is movably connected to the guide rod (15) in the upper and lower parts.

5. A planetary safety valve sealing surface grinding machine according to claim 4, characterized in that: The eccentric grinding mechanism (7) includes a drive motor (17), an eccentric wheel mechanism (18), and a planetary gear grinding disc (19). The drive motor (17) is fixedly connected to the moving plate (16), and the eccentric wheel mechanism (18) is connected to the output end of the drive motor (17). The eccentric wheel mechanism (18) extends into the center of the planetary gear grinding disc (19).

6. A planetary safety valve sealing surface grinding machine according to claim 5, characterized in that: The eccentric wheel mechanism (18) includes a rotating shaft (20), a connecting plate (21), a connecting shaft (22), an eccentric disk (23), and an eccentric shaft (24). The rotating shaft (20) is fixedly connected to the output end of the drive motor (17). The connecting plate (21) is coaxially fixedly connected to the rotating shaft (20). The connecting shaft (22) is eccentrically fixedly connected to the lower end face of the connecting plate (21). The eccentric disk (23) is concentrically fixedly connected to the connecting shaft (22). The eccentric shaft (24) is eccentrically fixedly connected to the eccentric disk (23). The lower end of the eccentric shaft (24) extends concentrically to the center end of the planetary gear grinding disk (19).

7. A planetary safety valve sealing surface grinding machine according to claim 6, characterized in that: The fasteners include a bolt rod (25) and a pressure plate (26). The bolt rod (25) is threadedly connected to the valve seat (1), and the pressure plate (26) is fitted onto the surface of the bolt rod (25) and pressed against the base plate (3).

8. A planetary safety valve sealing surface grinding machine according to claim 7, characterized in that: A weight block (27) is attached to the movable plate (16).

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