Eccentric outer circle grinding fixture for sealing arc piece of plug valve
By designing an eccentric outer cylindrical grinding fixture for the sealing arc plate of a plug valve, and utilizing components such as a main spindle, positioning key, eccentric seat, and adjusting shims, the problem of controlling the eccentricity of the sealing arc plate of the plug valve was solved, achieving precise eccentricity adjustment and improving the finished product qualification rate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING CHENWEI MACHINERY MFG CO LTD
- Filing Date
- 2024-10-29
- Publication Date
- 2026-06-02
AI Technical Summary
The eccentricity of the sealing arc of the existing plug valve is difficult to control, which means that the entire set of equipment needs to be replaced after the fixture wears out, resulting in high costs and low product qualification rate.
A grinding fixture for the eccentric outer cylindrical sealing arc of a plug valve was designed, including a main spindle, a positioning key, an eccentric seat, a centering seat, an adjusting shim, and bolts. The eccentricity is controlled by adjusting the thickness of the shim to achieve pre-grinding.
It achieves precise eccentricity control of the fixture, reduces manufacturing costs, improves the yield of finished products, and simplifies the manufacturing and maintenance process of the fixture.
Smart Images
Figure CN224310363U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of plug valves and accessories, and in particular relates to an eccentric outer cylindrical grinding fixture for the sealing arc plate of a plug valve. Background Technology
[0002] Plug valves are sealing components and consumable parts, widely used in fluid pipelines, such as plug valves in industrial oil and gas pipelines and other fluid pipelines. However, current manufacturing methods primarily rely on grinding, with the challenge lying in controlling the eccentricity distance. A common method is to assemble an eccentric seat to achieve the required eccentricity. The drawback is that instability after machining the eccentric seat can lead to variations in the eccentricity of a set of sealing discs; after a period of mass production, fixture wear necessitates replacing the entire fixture set, resulting in high tooling costs. Summary of the Invention
[0003] Technical Solution: To solve the above-mentioned technical problems, this utility model provides an eccentric external cylindrical grinding fixture for a plug valve sealing arc plate, specifically including a main spindle, a positioning key, an eccentric seat, and a centering seat; the main spindle is provided with two sets of symmetrical grooves along its central axis; the eccentric seat is installed on the outer side of the main spindle in a direction perpendicular to the grooves; the centering seat is installed on the outer side of the eccentric seat; the positioning key is used to install the centering seat and the eccentric seat on the outer side of the main spindle; wherein the positioning key, the eccentric seat, and the centering seat are installed in a structure that is axially symmetrical about the vertical direction of the main spindle axis.
[0004] As an improvement, an adjusting shim is also included, which is placed between the main spindle groove and the eccentric seat to adjust the distance between them.
[0005] As an improvement, pressure plates are also included, configured in two sets, for The structure consists of two sets of symmetrically installed structures, with each pressure plate independently configured to press on the outer side of the centering seat on one side and on the outer surface of the main spindle on the other side.
[0006] As an improvement, a first bolt is also included, of which multiple bolts are provided for connecting the pressure plate and the main spindle.
[0007] As an improvement, a second bolt is also included, which is configured as a plurality of internal hex bolts for connecting the centering seat and the eccentric seat.
[0008] Beneficial Effects: The eccentric outer cylindrical grinding fixture for the sealing arc plate of the plug valve proposed in this utility model is achieved by adding adjusting shims between the main spindle and the eccentric seat. The adjusting shims are adjusted and pre-ground simultaneously according to the required eccentricity, until the optimal eccentricity position at both ends is achieved, and then ground to the final shape. Furthermore, the fixture manufacturing process is simplified: the main spindle material is carburized and quenched, improving its service life; the machining methods for the fixture carrier eccentric seat and adjusting shims are simplified for easier manufacturing. The final assembly effect of the fixture is adjustable; by pre-grinding the adjusting shims, the synchronous eccentricity effect at both ends is achieved. Attached Figure Description
[0009] Figure 1 This is a perspective view of the fixture of this utility model.
[0010] Figure 2 This is a side view of the fixture of this utility model.
[0011] Figure 3 This is a top view of the fixture of this utility model.
[0012] Figure 4 This is a cross-sectional view of the fixture of this utility model.
[0013] In the diagram: 1. Main spindle; 2. Adjusting shim; 3. Positioning key; 4. Eccentric seat; 5. Centering seat; 6. Pressure plate; 7. First bolt; 8. Second bolt. 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 As shown, this utility model discloses an eccentric external cylindrical grinding fixture for the sealing arc plate of a plug valve, comprising a main spindle 1, a positioning key 3, an eccentric seat 4, and a centering seat 5. The main spindle 1 has two sets of symmetrical grooves along its central axis. The eccentric seat 4 is installed on the outer side of the main spindle 1 in a direction perpendicular to the grooves. The centering seat 5 is installed on the outer side of the eccentric seat 4. The positioning key 3 is used to install the centering seat 5 and the eccentric seat 4 on the outer side of the main spindle 1. The positioning key 3, the eccentric seat 4, and the centering seat 5 are installed in a structure that is axially symmetrical about the vertical direction of the main spindle axis.
[0016] This invention also includes an adjusting shim 2, which is disposed between the main spindle 1 groove and the eccentric seat to adjust the distance between them.
[0017] Furthermore, it also includes pressure plates 6, configured in two sets, for... The structure consists of two sets of symmetrically installed structures, with each pressure plate 6 independently configured to press one side against the outer surface of the centering seat 5 and the other side against the outer surface of the main spindle 1.
[0018] See Figure 4 As shown, it also includes a first bolt 7, of which there are multiple first bolts 7, for connecting the pressure plate 6 and the main spindle 1; it also includes a second bolt 8, of which there are multiple internal hex bolts, for connecting the centering seat 5 and the eccentric seat 4.
[0019] This utility model proposes an adjustable eccentric fixture, which is beneficial for controlling the fixture's accuracy, roundness, and dimensional requirements during the production process. Previous designs placed high demands on the machining of the fixture body, requiring the eccentricity at both ends after installation to be less than 0.025mm; often, the manufacturing accuracy could not be achieved or even exceeded tolerances, resulting in uncontrollable eccentricity in the ground product, including uneven outer arc dimensions, affecting the finished product's pass rate. With the new fixture body, the eccentricity and whether both ends are synchronized can be measured, calibrated, and pre-ground by adjusting the thickness of the shims, significantly reducing the manufacturing cost of the fixture body. Worn eccentric seats only require remachining and recalibration before use. The accuracy and diameter of the eccentricity can be adjusted by the shim thickness to achieve optimal testing results and ensure a high pass rate for finished products.
[0020] 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 eccentric outer cylindrical surface of a plug valve sealing arc, characterized in that: It includes a main spindle (1), a positioning key (3), an eccentric seat (4), and a centering seat (5); the main spindle (1) is provided with two sets of symmetrical channels along the central axis; the eccentric seat (4) is installed on the outer side of the main spindle (1) in a direction perpendicular to the channel; the centering seat (5) is installed on the outer side of the eccentric seat (4); the positioning key (3) is used to install the centering seat (5) and the eccentric seat (4) on the outer side of the main spindle (1); wherein the positioning key (3), the eccentric seat (4) and the centering seat (5) are installed in a structure that is axially symmetrical about the vertical direction of the axis of the main spindle (1).
2. The eccentric external cylindrical grinding fixture for the sealing arc plate of the plug valve according to claim 1, characterized in that: It also includes an adjusting shim (2), which is set between the main spindle (1) groove and the eccentric seat to adjust the distance between them.
3. The eccentric outer cylindrical grinding fixture for the sealing arc plate of the plug valve according to claim 1, characterized in that: It also includes pressure plates (6), set in two sets, for The structure consists of two sets of symmetrically installed structures, with each pressure plate (6) independently set to press on the outer side of the centering seat (5) on one side and on the outer surface of the main spindle (1) on the other side.
4. The eccentric outer cylindrical grinding fixture for the sealing arc plate of the plug valve according to claim 3, characterized in that: It also includes a first bolt (7), of which multiple first bolts (7) are provided for connecting the pressure plate (6) and the main spindle (1).
5. The eccentric external cylindrical grinding fixture for the sealing arc plate of the plug valve according to claim 1, characterized in that: It also includes a second bolt (8), which is configured as a plurality of internal hex bolts for connecting the centering seat (5) and the eccentric seat (4).