Internal grinding clamp for sealing arc piece of plug valve

Abstract

The utility model provides an internal grinding clamp for a sealing arc piece of a plug valve. The internal grinding clamp specifically comprises a connecting disc, a positioning disc, a positioning key, an internal grinding sleeve and a sealing groove. The connecting disc is connected with a main shaft flange at the central position of the upper end surface of the inner grinding sleeve; the positioning disc is the lower end face of the inner grinding sleeve; the inner grinding sleeve is of a barrel structure with a circular cavity in the middle, and the two sealing grooves are symmetrically formed in the barrel structure of the inner side wall of the cavity side wall in parallel. The multiple positioning keys are symmetrically distributed on the inner side wall of the circular cavity and protrude towards the center of the cylinder body. According to the clamp, the bottom surface of the sealing groove is directly used as a positioning surface, and the inner circle is semi-finely ground and finely ground. In addition, the end face depends on the positioning key as the end face vertical reference, and the installation error caused by the fact that the side face is not vertical is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of mechanical seals, and in particular relates to a grinding fixture for the inner circle of the sealing arc plate of a plug valve. Background Technology

[0002] Currently, plug valves commonly used in industrial oil and gas pipelines are fluid pipeline plug valves, belonging to the category of sealing components and easily worn parts. The inner bore is a hard sealing surface, requiring extremely high roundness and roughness in the machining process. However, current technology generally uses a universal clamping sleeve, which has a simple structure but is geared towards easy installation and disassembly. The problem with such sleeves is that there is no positioning device relative to the outer circular sealing groove, which leads to uneven thickness between the bottom diameter of the sealing groove and the inner diameter after the inner arc of the flange is precision ground. This difference in thickness at the same location can also cause leakage during rotation. Summary of the Invention

[0003] Technical Solution: To solve the above-mentioned technical problems, this utility model provides a rotary valve sealing arc plate inner grinding fixture, specifically including a connecting plate, a positioning plate, a positioning key, an inner grinding sleeve, and a sealing groove; the connecting plate is connected to the main shaft flange at the center of the upper end face of the inner grinding sleeve; the positioning plate is the lower end face of the inner grinding sleeve; the inner grinding sleeve is a cylindrical structure with a circular cavity in the middle, and two sealing grooves are provided, symmetrically and parallelly arranged on the inner side wall of the cavity on the cylindrical structure; multiple positioning keys are provided, symmetrically distributed on the inner side wall of the circular cavity, protruding towards the center of the cylinder.

[0004] As an improvement, the bottom of the connecting plate includes an arc plate and a notch, which are set in two sections and form a symmetrical structure. The arc is the same as the arc of the cylindrical structure of the cavity, and the two ends of each arc plate are placed between the two adjacent ends of the two sealing grooves. The notch is set on the inner side wall of the arc plate and engages with the positioning key.

[0005] As an improvement, it also includes inner pressure plates, with four plates. One end of each inner pressure plate is installed in the sealing groove, and the other end is movably pressed against the outside of one end of the arc plate.

[0006] As an improvement, a bolt is also included, which passes through the mounting hole of the inner grinding sleeve and has its other end abutting against the surface of the inner pressure plate.

[0007] Beneficial effects: The fixture proposed in this utility model uses the bottom surface of the sealing groove directly as the positioning surface, and performs semi-finishing and fine grinding of the inner circle. This positioning eliminates the uneven wall thickness of the arc plate caused by the cumulative error of the previous machining of the inner and outer diameters. In addition, the end face relies on the positioning key as the vertical reference of the end face, reducing the installation error caused by the non-perpendicularity of the side. Attached Figure Description

[0008] Figure 1 This is a side view of the fixture of this utility model.

[0009] Figure 2 This is the front view of the fixture of this utility model.

[0010] Figure 3 This is a perspective view of the fixture of this utility model.

[0011] In the diagram: 1. Connecting disc; 2. Positioning disc; 3. Positioning key; 4. Inner grinding sleeve; 5. Inner pressure plate; 6. Arc plate; 7. Sealing groove; 8. Bolt. Detailed Implementation

[0012] The specific embodiments of this utility model will be described in further detail below with reference to the examples. These examples are used to illustrate this utility model, but are not intended to limit its scope.

[0013] See Figure 3 As shown, a circular grinding fixture for the sealing arc plate of a plug valve includes a connecting plate 1, a positioning plate 2, positioning keys 3, an inner grinding sleeve 4, and a sealing groove 7. The connecting plate 1 is connected to the main shaft flange at the center of the upper end face of the inner grinding sleeve 4. The positioning plate 2 is the lower end face of the inner grinding sleeve 4. The inner grinding sleeve 4 is a cylindrical structure with a circular cavity in the middle. Two sealing grooves 7 are provided, symmetrically and parallelly arranged on the inner side wall of the cavity on the cylindrical structure. Multiple positioning keys 3 are provided, symmetrically distributed on the inner side wall of the circular cavity, and protrude towards the center of the cylinder.

[0014] See Figure 2 As shown, the bottom of the connecting plate 1 includes an arc plate 6 and a notch, which are set in two sections and form a symmetrical structure. The arc is the same as the arc of the cavity cylindrical structure, and the two ends of each arc plate 6 are placed between the two adjacent ends of the two sealing grooves 7. The notch is set on the inner side wall of the arc plate 6 and is engaged with the positioning key 3.

[0015] See Figure 3 As shown, it also includes inner pressure plates 5, of which four are provided. One end of each inner pressure plate 5 is installed in the sealing groove 7, and the other end is movably pressed against the outer side of one end of the arc plate 6.

[0016] See Figure 2 As shown, it also includes a bolt 8, which passes through the mounting hole of the inner grinding sleeve 4 and abuts against the surface of the inner pressure plate 5 at the other end.

[0017] Working principle: The connecting plate 1 is connected to the spindle flange; the mounting end face positioning plate of the inner grinding sleeve 4 is fixed to the spindle connecting plate; the inner pressure plate 5 is pressed and released by bolts 8 and springs. At the same time, the inner cavity of the inner grinding sleeve 4 and the inner pressure plate 5 of the sealing groove directly hook onto the bottom surface 6 of the arc plate and press it upward. The notch on the arc plate 6 of the end face positioning plate is adapted to the positioning key 3 according to the point contact surface, so that it is directly positioned on the bottom surface of the sealing groove.

[0018] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A grinding fixture for the inner cylindrical sealing arc of a plug valve, characterized in that: It includes a connecting plate (1), a positioning plate (2), a positioning key (3), an inner grinding sleeve (4), and a sealing groove (7); the connecting plate (1) is connected to the main shaft flange at the center of the upper end face of the inner grinding sleeve (4); the positioning plate (2) is the lower end face of the inner grinding sleeve (4); the inner grinding sleeve (4) is a cylindrical structure with a circular cavity in the middle; two sealing grooves (7) are provided, symmetrically and parallelly arranged on the inner side wall of the cavity on the cylindrical structure; multiple positioning keys (3) are provided, symmetrically distributed on the inner side wall of the circular cavity, and protruding towards the center of the cylinder.

2. The internal grinding fixture for the sealing arc plate of the plug valve according to claim 1, characterized in that: The bottom of the connecting plate (1) includes an arc plate (6) and a notch, which are set in two sections and form a symmetrical structure. The arc is the same as the arc of the cavity cylindrical structure, and the two ends of each arc plate (6) are placed between the two adjacent ends of the two sealing grooves (7). The notch is located on the inner wall of the arc plate (6) and engages with the positioning key (3).

3. The inner grinding fixture for the sealing arc plate of the plug valve according to claim 2, characterized in that: It also includes an inner pressure plate (5), with 4 plates. One end of each inner pressure plate (5) is installed in the sealing groove (7), and the other end is movably pressed against the outside of one end of the arc plate (6).

4. The internal grinding fixture for the sealing arc plate of the plug valve according to claim 3, characterized in that: It also includes a bolt (8) that passes through the mounting hole of the inner grinding sleeve (4) and abuts against the surface of the inner pressure plate (5) at the other end.

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