Large-diameter valve body sealing surface grinding tool

Abstract

The utility model discloses a grinding tool for a sealing surface of a large-diameter valve body, which belongs to the technical field of valve body processing equipment and comprises a straight rod and a grinding piece arranged at one end of the straight rod. The grinding piece comprises a disc and grinding heads arranged along the circumferential side of the disc at equal intervals, and adjustable connecting pieces used for adjusting the distance between the grinding heads and the disc are arranged between the grinding heads and the disc. The adjustable connecting piece comprises connecting blocks connected with the disc in an inserted mode, limiting grooves are formed in the annular side face of the disc at equal intervals, the connecting blocks are installed in the limiting grooves in a one-to-one correspondence mode, and the grinding heads correspond to the connecting blocks in a one-to-one correspondence mode and are adjustably installed on the connecting blocks. The distance between the end face of the outer side of the grinding head and the disc can be adjusted according to the size of the caliber of the sealing face of the valve body, parts of various specifications do not need to be arranged, grinding pieces do not need to be replaced, and the valve body grinding device can well adapt to valve bodies with different sealing face calibers and is good in universality.

Description

Technical Field

[0001] This utility model mainly relates to the technical field of valve body processing equipment, specifically a grinding fixture for the sealing surface of a large-diameter valve body. Background Technology

[0002] Ball valves are widely used in industries such as petroleum refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, power, and municipal engineering, playing a crucial role in the national economy. The grinding precision of the valve body's sealing surface directly determines the valve's quality. Large-diameter ball valves require lip seals on their body parts, with a surface roughness requirement as high as Ra0.3. Traditional methods use sandpaper for grinding, but this method is inefficient, time-consuming, and labor-intensive. The grinding precision and speed are greatly affected by the operator's skill level, and it easily leads to uneven grinding and insufficient precision, thus impacting the quality of the ball valve product.

[0003] Patent document CN 208629077 U discloses a grinding device for the sealing surface of a large-diameter gate valve body. Through the cooperation between the upper and lower connecting pipes, a grinding plate can be effectively driven to grind the valve body sealing surface. Combined with the cooperation of the limiting component and the pressure plate, the valve body stop can be effectively sealed, preventing grinding debris from flying and avoiding rotation of the pressure plate. However, this device has the following drawback: poor versatility. To adapt to valve bodies with different sealing surface diameters, various sizes of grinding plates are required, and the appropriate size grinding plate must be replaced during operation. Utility Model Content

[0004] This utility model provides a solution that is significantly different from existing technologies, addressing the problem of overly simplistic solutions in existing technologies. It mainly provides a grinding fixture for the sealing surface of a large-diameter valve body, which solves the problem of poor versatility mentioned in the background.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A grinding fixture for the sealing surface of a large-diameter valve body includes a straight rod and a grinding component mounted on one end of the straight rod; the grinding component includes a disc and grinding heads arranged at equal intervals along its circumference, and an adjustable connecting component is provided between the grinding heads and the disc for adjusting the distance between them.

[0007] Furthermore, the adjustable connector includes a connecting block that is plugged into the disc. Limiting grooves are equally spaced on the annular side of the disc. The connecting blocks are installed in the limiting grooves one by one. The grinding head is installed on the connecting block in an adjustable manner, corresponding to the connecting block.

[0008] Furthermore, the connecting block has a connecting groove for inserting a grinding head, the grinding head including a cylindrical part that inserts into the connecting groove, and the length direction of the cylindrical part is located in the radial direction of the disk.

[0009] Furthermore, a pre-tension spring is fitted onto the cylindrical part, and the two ends of the pre-tension spring abut against the connecting block and the grinding head, respectively.

[0010] Furthermore, the connecting block has a strip-shaped hole that connects to the connecting groove, and the cylindrical part has at least two limiting holes, one of which is connected to a screw that passes through the strip-shaped hole; and the length directions of the connecting groove and the strip-shaped hole are both located in the radial direction of the disk.

[0011] Furthermore, the end face of the grinding head facing away from the disk is an arc-shaped surface.

[0012] Furthermore, a threaded hole is provided at the center of the disk, and one end of the straight rod is threaded onto the threaded hole.

[0013] Furthermore, a pressure plate is fitted onto the straight rod, and a single-row angular contact ball bearing is provided on the pressure plate. The single-row angular contact ball bearing is fitted onto the straight rod and embedded in the pressure plate, and is tightened by a clamping nut. The clamping nut is fitted onto the straight rod and threadedly connected to the pressure plate.

[0014] Furthermore, a horizontal through hole is provided at the upper end of the straight rod, and a rotating handle is inserted into the horizontal through hole.

[0015] Furthermore, a lifting nut is fixedly installed at the top of the straight rod.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] (1) This utility model replaces the original grinding plate with a disc and grinding heads arranged at equal intervals along its circumference, and the distance between the grinding heads and the disc can be adjusted by an adjustable connector. In application, the distance between the outer end face of the grinding head and the disc can be adjusted according to the diameter of the valve body sealing surface. Therefore, this utility model does not need to be equipped with parts of various specifications, nor does it need to replace the grinding parts. It can adapt well to valve bodies with different sealing surface diameters and has good versatility.

[0018] (2) In the optimized solution of this utility model, a pre-tightening spring is installed on the grinding head. The pre-tightening spring always applies a thrust to the grinding head, so that the grinding head and the valve body sealing surface fit more tightly, thereby improving the grinding roughness and thus increasing the grinding speed by several times.

[0019] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the application of this utility model;

[0021] Figure 2 This is a top view of the grinding part in this utility model;

[0022] Figure 3 This is a schematic diagram of the grinding head in this utility model; wherein, Figure (a) is a top view and Figure (b) is a side view;

[0023] Figure 4 Figure (a) is a partial sectional view from a top view, and Figure (b) is a top view.

[0024] Figure 5 This is a top-view cross-sectional view of the disk in this utility model.

[0025] Reference numerals: 1. Valve body; 2. Grinding head; 21. Cylindrical part; 22. Limiting hole; 3. Preload spring; 4. Connecting block; 41. Connecting groove; 42. Strip hole; 5. Disc; 51. Limiting groove; 52. Threaded hole; 6. Straight rod; 7. Single row angular contact ball bearing; 8. Compression nut; 9. Pressure plate; 10. Rotating handle; 11. Lifting nut. Detailed Implementation

[0026] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Example 1: Please refer to the appendix for details. Figure 1 - Appendix Figure 5A grinding fixture for the sealing surface of a large-diameter valve body, comprising:

[0030] The straight rod 6 is specifically a stepped shaft that is thinner at the top and thicker at the bottom. A horizontal through hole is opened at the upper end of the straight rod 6, and a rotating handle 10 is inserted into the horizontal through hole. The straight rod 6 can be rotated by rotating the handle 10.

[0031] The disc 5 is threadedly connected to the lower end of the straight rod 6. A threaded hole 52 is provided at the center of the disc 5, and the lower end of the straight rod 6 is provided with an external thread that is compatible with it. Limiting grooves 51 are provided at equal intervals along the circumference of the annular side of the disc 5.

[0032] Connecting blocks 4 are installed one-to-one in the limiting grooves 51 and fixed by fasteners (such as fastening screws); the length direction of the connecting blocks 4 is located in the radial direction of the disk 5; the connecting blocks 4 are provided with connecting grooves 41 for the grinding head 2 to be inserted and strip holes 42 located on one side of the connecting grooves 41, and the length directions of the connecting grooves 41 and the strip holes 42 are both located in the radial direction of the disk 5.

[0033] The grinding head 2 is configured in a one-to-one correspondence with the connecting block 4. The grinding head 2 includes a cylindrical part 21 that inserts into the connecting groove 41, and the length direction of the cylindrical part 21 is located in the radial direction of the disk 5. The outer end of the cylindrical part 21 is formed with a head, and the end face of the head facing away from the disk 5 is an arc-shaped surface. A pre-tensioning spring 3 is fitted on the cylindrical part 21, and the two ends of the pre-tensioning spring 3 respectively abut against the connecting block 4 and the grinding head 2. At least two limiting holes 22 are opened on the cylindrical part 21 (three limiting holes 22 are shown in the figure). A screw passing through the strip hole 42 is connected to one of the limiting holes 22. By adjusting the limiting hole 22 connected by the screw, the length of the grinding head 2 that can extend out of the connecting block 4 under the pushing force of the pre-tensioning spring 3 can be limited, thereby realizing the adjustment of the distance between the grinding head 2 and the disk 5.

[0034] In application, adjust the screw to the appropriate limiting hole 22 according to the diameter of the sealing surface of the valve body 1 to be processed. Under the push of the preload spring 3, the grinding head 2 moves outward until the screw abuts the outer end of the strip hole 42. At this time, the preload spring 3 is still in a compressed state, so that the reaction force when the grinding head 2 grinds the sealing surface of the valve body 1 is insufficient to overcome the elastic force of the preload spring 3. Lower this fixture from the top port of the valve body 1 to the point where the grinding head 2 contacts the sealing surface of the valve body 1. Then rotate the rotating handle 10 to drive the straight rod 6 to rotate, and the disc 5 rotates accordingly, driving the grinding head 2 to rotate, thereby achieving the grinding of the sealing surface of the valve body 1.

[0035] Example 2: The difference between this example and Example 1 is that:

[0036] In this embodiment, please refer to the appendix for details. Figure 1A pressure plate 9 is fitted onto the narrower part of the upper part of the straight rod 6. A single-row angular contact ball bearing 7 is provided on the pressure plate 9. The single-row angular contact ball bearing 7 is fitted onto the straight rod 6 and embedded in the pressure plate 9 and is tightened by a clamping nut 8. The clamping nut 8 is fitted onto the straight rod 6 and threadedly connected to the pressure plate 9. This effectively reduces the friction between the straight rod 6 and the pressure plate 9 during rotation, preventing the pressure plate 9 from rotating. At the same time, it effectively seals the stop of the valve body 1, preventing the flying of grinding waste.

[0037] In this embodiment, please refer to the appendix for details. Figure 1 The top of the straight rod 6 is fixedly installed (welded after assembly) with a lifting nut 11, which allows the tool to be easily installed inside the large-diameter valve body 1.

[0038] Everything else is the same as in Example 1.

[0039] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A grinding fixture for the sealing surface of a large-diameter valve body, comprising a straight rod (6) and a grinding element mounted on one end of the straight rod (6); characterized in that: The grinding component includes a disc (5) and grinding heads (2) arranged at equal intervals along its periphery, and an adjustable connector for adjusting the distance between the grinding heads (2) and the disc (5) is provided.

2. The grinding fixture for the sealing surface of a large-diameter valve body according to claim 1, characterized in that: The adjustable connector includes a connecting block (4) that is plugged into the disc (5). The disc (5) has equal-spaced limiting grooves (51) on its annular side surface. The connecting blocks (4) are installed in the limiting grooves (51) one by one. The grinding head (2) is installed on the connecting block (4) in an adjustable manner, corresponding to the connecting block (4).

3. The grinding fixture for the sealing surface of a large-diameter valve body according to claim 2, characterized in that: The connecting block (4) has a connecting groove (41) for inserting the grinding head (2). The grinding head (2) includes a cylindrical part (21) that inserts into the connecting groove (41), and the length direction of the cylindrical part (21) is located in the radial direction of the disk (5).

4. The grinding fixture for the sealing surface of a large-diameter valve body according to claim 3, characterized in that: A preload spring (3) is fitted on the cylindrical part (21), and the two ends of the preload spring (3) abut against the connecting block (4) and the grinding head (2) respectively.

5. The grinding fixture for the sealing surface of a large-diameter valve body according to claim 3, characterized in that: The connecting block (4) has a strip hole (42) that connects to the connecting groove (41), and the cylindrical part (21) has at least two limiting holes (22), one of which is connected to a screw that passes through the strip hole (42); and the length directions of the connecting groove (41) and the strip hole (42) are both located in the radial direction of the disc (5).

6. The grinding fixture for the sealing surface of a large-diameter valve body according to claim 1, characterized in that: The end face of the grinding head (2) facing away from the disk (5) is an arc-shaped surface.

7. The grinding fixture for the sealing surface of a large-diameter valve body according to claim 1, characterized in that: A threaded hole (52) is provided at the center of the disc (5), and one end of the straight rod (6) is threaded to the threaded hole (52).

8. The grinding fixture for the sealing surface of a large-diameter valve body according to claim 1, characterized in that: A pressure plate (9) is fitted on the straight rod (6), and a single-row angular contact ball bearing (7) is provided on the pressure plate (9). The single-row angular contact ball bearing (7) is fitted on the straight rod (6) and embedded in the pressure plate (9) and tightened by a clamping nut (8). The clamping nut (8) is fitted on the straight rod (6) and threadedly connected to the pressure plate (9).

9. The grinding fixture for the sealing surface of a large-diameter valve body according to claim 1, characterized in that: The upper end of the straight rod (6) is provided with a horizontal through hole, and a rotating handle (10) is inserted into the horizontal through hole.

10. A grinding fixture for the sealing surface of a large-diameter valve body according to claim 1, characterized in that: A lifting nut (11) is fixedly installed on the top of the straight rod (6).

Images