Elastic positioning clamp for internal grinding of sealing arc piece of plug valve

Abstract

The utility model provides an elastic positioning clamp for internal grinding of a sealing arc piece of a plug valve. The elastic positioning clamp comprises a flange connecting disc, a positioning disc, an internal grinding sleeve, a locking block and an end pressing plate. One end face of the flange connecting disc is detachably connected with the grinding machine spindle, and the other end face of the flange connecting disc is connected with the positioning disc. The positioning disc is connected with the clamp sleeve through a cushion pin; the inner grinding sleeve is a central sleeve of the clamp sleeve; the locking block is an arc-shaped end face pressing mechanism which is attached to the inner side wall of the inner grinding sleeve. One end of the end pressing plate is installed on the outer side of the locking block, and the other end is arranged on the outer surface of the inner grinding sleeve of the clamp sleeve. According to the clamp, the flange plate is designed to be of an independent structure, disassembly is easy, and the manufacturing cost is low; the inner cylinder structure is changed into an elastic structure, so that the installation is more convenient; the end face pressing structure is used, the workpiece technology guarantees that the end faces are parallel, repositioning machining can be achieved, and repositioning machining errors are reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of plug valve processing parts, and in particular relates to an elastic positioning fixture for grinding the inner cylindrical part of the sealing arc plate of a plug valve. Background Technology

[0002] Plug valves are crucial components in oil and gas pipeline valve bodies, belonging to the category of sealing elements. The precision requirements for manufacturing this part lie in the semi-circular inner bore, demanding a hard seal within the valve body. Therefore, extremely high manufacturing precision is required. However, current plug valve manufacturing structures suffer from inconsistent manufacturing precision for the fixture body and limited versatility with machine tool chucks, resulting in poor fixture self-manufacturing capabilities and hindering large-area machining. Summary of the Invention

[0003] Technical Solution: To solve the above-mentioned technical problems, based on the optimized design of the fixture, the versatility of the chuck during processing is expanded, and the self-manufacturing capability is improved, this utility model provides an elastic positioning fixture for grinding the inner cylindrical part of a plug valve sealing arc plate, including a flange connecting plate, a positioning plate, an inner grinding sleeve, a locking block, and an end pressure plate; one end face of the flange connecting plate is detachably connected to the grinding machine spindle, and the other end face is connected to the positioning plate; the positioning plate is connected to the fixture sleeve through a pad pin; the inner grinding sleeve is the central sleeve of the fixture sleeve; the locking block is an arc-shaped end face pressing mechanism attached to the inner side wall of the inner grinding sleeve; one end of the end pressure plate is installed on the outside of the locking block, and the other end is set on the outer surface of the inner grinding sleeve of the fixture sleeve.

[0004] As an improvement, the locking block includes a structural block, a spring, and a steel ball; the structural block is a hollow structure with at least two opposite arc-shaped surfaces and openings, one of which contacts the inner side of the inner grinding sleeve, and the other contacts the workpiece; one end of the spring is placed on the side of the structural block, and the other end contacts the steel ball; the other end of the steel ball corresponds to the opening position, and its surface contacts the workpiece.

[0005] As an improvement, the diameter of the steel ball is larger than the diameter of the opening.

[0006] As an improvement, four end pressure plates are installed; four locking blocks are installed, which are distributed in a circle at intervals.

[0007] As an improvement, one of the structural blocks is provided with 1-2 sets of openings, with each opening corresponding to a spring and a steel ball.

[0008] Beneficial effects: The fixture proposed in this utility model is simple to disassemble and has low manufacturing cost by designing the flange as a separate structure; the inner cylinder structure is changed to an elastic structure, making installation more convenient; and the use of an end face clamping structure ensures that the workpiece end face is parallel, which can realize repositioning and processing and reduce repositioning and processing errors. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the fixture of this utility model.

[0010] Figure 2 This is a cross-sectional schematic diagram of the fixture of this utility model.

[0011] Figure 3 This is a schematic diagram of the fixture of this utility model along section AA.

[0012] Figure 4 This is a top view of the fixture of this utility model.

[0013] In the diagram: 1. Flange connecting plate; 2. Positioning plate; 3. Inner grinding sleeve; 4. Locking block; 5. End pressure plate; 6. Clamp sleeve; 7. Structural block; 8. Spring; 9. Steel ball; 10. Wash pin. Detailed Implementation

[0014] 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.

[0015] See Figure 1-3 As shown, the elastic positioning fixture for the inner cylindrical grinding of the sealing arc plate of the plug valve includes a flange connecting plate 1, a positioning plate 2, an inner grinding sleeve 3, a locking block 4, and an end pressure plate 5. One end face of the flange connecting plate 1 is detachably connected to the grinding machine spindle, and the other end face is connected to the positioning plate 2. The positioning plate 2 is connected to the fixture sleeve 6 through a pad pin 10. The inner grinding sleeve 3 is the central sleeve of the fixture sleeve 6. The locking block 4 is an arc-shaped end face pressing mechanism attached to the inner side wall of the inner grinding sleeve 3. One end of the end pressure plate 5 is installed on the outside of the locking block 4, and the other end is set on the outer surface of the inner grinding sleeve 3 of the fixture sleeve 6.

[0016] To achieve elastic clamping of the workpiece by the locking block 7, this invention improves the locking block. Specifically, the locking block 4 includes a structural block 7, a spring 8, and a steel ball 9. The structural block 7 is a hollow structure with at least two opposite arc-shaped surfaces and openings. One arc-shaped surface contacts the inner side of the inner grinding sleeve 3, and the other contacts the workpiece. One end of the spring 8 is placed on the side of the structural block 7, and the other end contacts the steel ball 9. The other end of the steel ball 9 corresponds to the opening position, and its surface contacts the workpiece. The diameter of the steel ball 9 is larger than the diameter of the opening.

[0017] In a specific embodiment of this utility model, four end pressure plates 5 are installed; four locking blocks 4 are installed, and the four are distributed in a circle at intervals.

[0018] Preferably, one of the structural blocks 7 is provided with 1-2 sets of openings, with one opening corresponding to one spring 8 and one steel ball 9.

[0019] Working principle: The structure of this utility model is characterized by a separately configured flange, which is combined with the positioning plate and the inner grinding sleeve into a single component. The structure of the inner grinding sleeve has been changed from a circumferential tensioning structure to an elastic steel ball structure, so that the workpiece is tightened against the inner grinding sleeve wall after being placed in. An end face clamping mechanism is adopted, which allows for repeated processing as long as the end faces are kept parallel, reducing repositioning errors.

[0020] In addition, this fixture can replace the spindle flange without replacing the fixture body; it is easy to clamp, and the workpiece positioning accuracy can be achieved by relying on the elastic steel ball to extend and retract the pressure; the end pressure structure, the end face pin combination positioning surface in the positioning plate, and the end face three points are kept parallel and pressed together with the end pressure plate to achieve end face positioning, which is convenient for repeated positioning of the workpiece as a machining reference.

[0021] 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. An elastic positioning fixture for grinding the inner circle of the sealing arc plate of a plug valve, characterized in that: The device includes a flange connecting plate (1), a positioning plate (2), an inner grinding sleeve (3), a locking block (4), and an end pressure plate (5). One end face of the flange connecting plate (1) is detachably connected to the grinding machine spindle, and the other end face is connected to the positioning plate (2). The positioning plate (2) is connected to the fixture sleeve (6) through a pad pin. The inner grinding sleeve (3) is the central sleeve of the fixture sleeve (6). The locking block (4) is an arc-shaped end face pressing mechanism attached to the inner side wall of the inner grinding sleeve (3). One end of the end pressure plate (5) is installed on the outside of the locking block (4), and the other end is set on the outer surface of the inner grinding sleeve (3) of the fixture sleeve (6).

2. The elastic positioning fixture for grinding the inner cylindrical sealing arc of the plug valve according to claim 1, characterized in that: The locking block (4) includes a structural block (7), a spring (8), and a steel ball (9); the structural block (7) is a hollow structure with at least two opposite arc-shaped surfaces and openings, one of which contacts the inner side of the inner grinding sleeve (3), and the other contacts the workpiece; one end of the spring (8) is placed on the side of the structural block (7), and the other end contacts the steel ball (9); the other end of the steel ball (9) corresponds to the opening position, and its surface contacts the workpiece.

3. The elastic positioning fixture for grinding the inner cylindrical sealing arc of the plug valve according to claim 1, characterized in that: The diameter of the steel ball (9) is larger than the diameter of the opening.

4. The elastic positioning fixture for grinding the inner cylindrical sealing arc of the plug valve according to claim 1, characterized in that: The end pressure plate (5) is installed in four places; the locking block (4) is installed in four places, which are distributed in a circle at intervals.

5. The elastic positioning fixture for grinding the inner cylindrical sealing arc of the plug valve according to claim 2, characterized in that: One of the structural blocks (7) is provided with 1-2 sets of openings, one opening corresponding to a spring (8) and a steel ball (9).

Images