Positioning tool for detecting size of elastic valve seat

Abstract

The utility model discloses a positioning tool for detecting the size of an elastic valve seat. The positioning tool comprises a positioning bottom plate for placing the elastic valve seat in a horizontal state and an opening module which is arranged on the positioning bottom plate and is supported on the inner wall of the elastic valve seat to prevent the elastic valve seat from deforming. The opening module comprises a cylindrical platform arranged in the middle of the positioning bottom plate, a plurality of ejector rods annularly and movably arranged on the outer wall of the cylindrical platform and used for being supported on the inner wall of the elastic valve seat, and a driving module for simultaneously driving the ejector rods to stretch out or retract in the radial direction of the cylindrical platform. The tool is simple in structure and convenient to operate, improves the size measurement efficiency, can improve the measurement precision, can adapt to elastic valve seats made of different materials and having different sizes, and is good in universality.

Description

[Technical Field]

[0001] This utility model belongs to the field of valve technology, and in particular relates to a positioning tool for detecting the size of an elastic valve seat. [Background Technology]

[0002] As a critical sealing component in valves, the valve seat's dimensions are extremely important for the valve's sealing function. Due to the different molding methods for different materials, polymer plastic valve seats are molded using injection molding and compression molding, while rubber valve seats are molded using injection molding and compression molding. Through different molding methods, the dimensions of the valve seat after molding will deviate from the design dimensions to varying degrees. Large dimensional deviations may lead to leaks and production safety accidents, causing serious economic losses. Therefore, dimensional inspection of resilient valve seats is very important.

[0003] In the prior art, Chinese Patent Publication No. CN221077517U discloses a tooling for detecting the size of a soft-seal ball valve seat. The ball base and the inner wall surface of the detection groove together form a valve seat mounting groove for the valve seat to be inserted. The upper surface of the outer diameter detection base forms a height detection surface for detecting the installation height of the valve seat. When the valve seat is placed in the valve seat mounting groove and continuously pressed down until it can no longer be pressed down, the installation height of the valve seat is judged to be qualified by measuring whether the height difference between the height detection surface and the upper surface of the valve seat meets the design requirements. This solution can only qualitatively determine whether the installation height of the valve seat is qualified. If it is necessary to accurately measure the height, inner diameter and outer diameter of the valve seat, the above solution cannot complete the measurement. Moreover, since the elastic valve seat is deformable, it is difficult to obtain reliable dimensions of the elastic valve seat without relevant fixing fixtures and tooling, and it is also difficult to ensure the repeatability of the test.

[0004] Therefore, it is necessary to provide a positioning fixture for detecting the size of resilient valve seats to solve the above-mentioned technical problems. [Utility Model Content]

[0005] The main purpose of this utility model is to provide a positioning fixture for measuring the size of elastic valve seats. It has a simple structure and is easy to operate, which improves the efficiency and accuracy of size measurement. It can also be adapted to elastic valve seats of different materials and sizes, and has good versatility.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: a positioning fixture for detecting the size of an elastic valve seat, comprising a positioning base plate for placing a horizontal elastic valve seat and a spreading module disposed on the positioning base plate and supported on the inner wall of the elastic valve seat to prevent deformation of the elastic valve seat; the spreading module comprises a cylindrical platform disposed in the middle of the positioning base plate, a plurality of push rods movably disposed in a ring on the outer wall of the cylindrical platform and used to support the inner wall of the elastic valve seat, and a driving module that simultaneously drives the plurality of push rods to extend or retract radially along the cylindrical platform.

[0007] Furthermore, the positioning base plate is set on a three-coordinate measuring machine platform.

[0008] Furthermore, the upper surface of the positioning base plate serves as the reference surface for positioning the elastic valve seat. The elastic valve seat is placed horizontally on the positioning base plate and fully conforms to the reference surface to facilitate the measurement of the height of the elastic valve seat.

[0009] Furthermore, several of the push rods are evenly distributed at equal angles on the outer wall of the cylindrical platform, and the push rods extend horizontally with the same length.

[0010] Furthermore, several of the aforementioned top rods are at the same height.

[0011] Furthermore, the push rod includes a telescopic rod and a conformal contact portion disposed at the front end of the telescopic rod and conforming to the inner wall of the elastic valve seat.

[0012] Furthermore, the contoured contact portion is configured as a semi-cylindrical structure, with the side connected to the telescopic rod being flat and the side in contact with the elastic valve seat being arc-shaped.

[0013] Furthermore, the drive module is a hydraulic transmission device, which can control the clamping force, ejection speed and retraction speed of the push rod by adjusting the hydraulic pressure.

[0014] Compared with the prior art, the advantages of the positioning fixture for detecting the size of elastic valve seats of this utility model are as follows:

[0015] (1) The positioning base plate is set on the three coordinate measuring platform. The elastic valve seat is placed horizontally on the reference surface. The bottom surface of the elastic valve seat is completely in contact with the reference surface. After the elastic valve seat is fully opened by the expansion module, the height, inner diameter and outer diameter of the elastic valve seat can be measured directly. The positioning fixture has a simple structure and is easy to operate, which improves the efficiency of dimension measurement.

[0016] (2) Several push rods extend horizontally and have the same length. The front ends of the push rods are distributed in a ring at equal angles and present a standard ring. When several push rods extend at the same time, the push rods fully open the elastic valve seat so that the elastic valve seat presents a standard ring, which facilitates the measurement of the inner and outer diameters of the elastic valve seat and improves the accuracy of the size measurement.

[0017] (3) Several push rods are at the same height, and several push rods extend and press against the same height of the elastic valve seat at the same time, which can avoid the problem of the elastic valve seat moving upward;

[0018] (4) The drive module is a hydraulic transmission device, which can control the clamping force, ejection speed and retraction speed of the push rod by adjusting the hydraulic pressure, so as to adapt to elastic valve seats of different materials and different sizes, and has good versatility. [Attached Image Description]

[0019] Figure 1 This is a front view schematic diagram of the positioning fixture used for measuring the size of the elastic valve seat according to an embodiment of the present invention;

[0020] Figure 2 This is a top view of the positioning fixture used for measuring the size of the elastic valve seat according to an embodiment of the present invention.

[0021] Figure 3 This is a partial cross-sectional view of the positioning fixture used for measuring the size of the elastic valve seat in an embodiment of the present invention.

[0022] The numbers in the image represent:

[0023] 100 - Positioning fixture for measuring the dimensions of resilient valve seats; 200 - Resilient valve seat;

[0024] 1-Positioning base plate, 11-Reference surface;

[0025] 2-Expanding module, 21-Cylindrical platform, 22-Top rod, 221-Telescopic rod, 222-Contouring contact part, 23-Drive module.

Detailed Implementation Methods

[0026] Please refer to Figures 1-3 This embodiment is a positioning fixture 100 for detecting the size of an elastic valve seat. The positioning fixture 100 for detecting the size of an elastic valve seat includes a positioning base plate 1 for placing a horizontal elastic valve seat 200 and a spreading module 2 disposed on the positioning base plate 1 and supported on the inner wall of the elastic valve seat 200 to prevent deformation of the elastic valve seat 200. The spreading module 2 includes a cylindrical platform 21 disposed in the middle of the positioning base plate 1, a plurality of push rods 22 movably disposed on the outer wall of the cylindrical platform 21 and used to support the inner wall of the elastic valve seat 200, and a driving module 23 that simultaneously drives the plurality of push rods 22 to extend or retract radially along the cylindrical platform 21.

[0027] The positioning base plate 1 is set on a coordinate measuring machine platform. The upper surface of the positioning base plate 1 serves as the reference surface 11 for positioning the bottom surface of the elastic valve seat 200. The elastic valve seat 200 is placed horizontally on the reference surface 11, with the bottom surface of the elastic valve seat 200 completely in contact with the reference surface 11, allowing for the measurement of the height of the elastic valve seat 200. During measurement, the height of the elastic valve seat 200 can be measured at different positions, and the average value of the measurements is taken as the height of the elastic valve seat 200.

[0028] The resilient valve seat 200 is an annular structure. Its inner and outer walls need to contact the ball and valve seat respectively to achieve a seal. Therefore, the inner and outer diameters of the resilient valve seat 200 need to achieve high precision to ensure a good seal. However, the resilient valve seat 200 has a large diameter and a small wall thickness and height. When the resilient valve seat 200 is placed horizontally on the reference surface 11 of the positioning base plate 1, it shrinks or deforms locally, causing it to appear elliptical instead of a standard annular shape. This results in deviations when measuring the inner and outer diameters of the resilient valve seat 200, affecting the dimensional measurement. To solve this problem, a spreading module 2 is provided on the positioning base plate 1. When the resilient valve seat 200 is placed on the positioning plate 1, the spreading module 2 is located within the inner ring of the resilient valve seat 200, driving... Module 23 drives several push rods 22 to extend simultaneously and press against the inner wall of the elastic valve seat 200 to prevent deformation of the elastic valve seat 200. In order to ensure that the elastic valve seat 200 presents a standard ring shape, several push rods 22 are evenly distributed at equal angles on the outer wall of the cylindrical platform 21. Several push rods 22 extend horizontally and have the same length. The front ends of the push rods 22 are evenly distributed at equal angles and present a standard ring shape. When several push rods 22 extend simultaneously, the push rods 22 fully expand the elastic valve seat 200 so that the elastic valve seat 200 presents a standard ring shape, so as to facilitate the measurement of the inner and outer diameters of the elastic valve seat 200 and improve the accuracy of the dimensional measurement.

[0029] Since the inner wall of the elastic valve seat 200 is arc-shaped, to facilitate the contact and tightness between the push rod 22 and the inner wall of the elastic valve seat 200, the push rod 22 includes a telescopic rod 221 and a contoured contact portion 222 disposed at the front end of the telescopic rod 221 and conforming to the inner wall of the elastic valve seat 200. In this embodiment, the contoured contact portion 222 is configured as a semi-cylindrical structure. The side connected to the telescopic rod 221 is flat to facilitate installation and fixation with the telescopic rod 221, while the side in contact with the elastic valve seat 200 is arc-shaped to facilitate contact and tightness with the inner wall of the elastic valve seat 200. Setting the contoured contact portion 222 as a semi-cylindrical structure with a certain height increases the contact area with the elastic valve seat 200, allowing the contoured valve seat 200 to be better opened.

[0030] Since the elastic valve seat 200 is placed directly and horizontally on the reference surface 11 of the positioning base plate 1, when several push rods 22 simultaneously press against the inner wall of the elastic valve seat 200, to prevent the elastic valve seat 200 from moving upward due to the action of the push rods 22, several push rods 22 are evenly distributed at equal angles on the outer wall of the cylindrical platform 21, and several push rods 22 are at the same height. Several push rods 22 extend and simultaneously press against the elastic valve seat 200 at the same height, which can avoid the problem of the elastic valve seat 200 moving upward. The flatness of the horizontal center plane where the push rods 22 are located and the reference surface 11 is ≤0.005mm, so as to ensure the accuracy of dimensional measurement.

[0031] In this embodiment, the drive module 23 is a hydraulic transmission device, which can control the clamping force, ejection speed, and retraction speed of the push rod 22 by adjusting the hydraulic pressure, so as to adapt to elastic valve seats 200 of different materials and sizes. It has good versatility. The hydraulic transmission device is existing technology and will not be described in detail here. In other embodiments, the drive module 23 can be set according to the actual situation, and there is no limitation here.

[0032] When using the positioning fixture 100 for measuring the dimensions of the elastic valve seat provided in this solution, the elastic valve seat 200 is placed horizontally on the reference surface 11, with the bottom surface of the elastic valve seat 200 completely in contact with the reference surface 11. At this time, the spreading module 2 is located inside the elastic valve seat 200, and the driving module 23 drives several push rods 22 to extend and push against the inner wall of the elastic valve seat 200 simultaneously. The height, inner diameter, and outer diameter of the elastic valve seat 200 are measured. After the measurement is completed, the driving module 23 drives several push rods 22 to retract simultaneously, and the elastic valve seat 200 is removed. A new elastic valve seat 200 is then placed in to continue the dimension measurement.

[0033] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A positioning fixture for detecting the size of an elastic valve seat, characterized in that: It includes a positioning base plate for placing a horizontally positioned elastic valve seat and a spreading module disposed on the positioning base plate and supported on the inner wall of the elastic valve seat to prevent deformation of the elastic valve seat; the spreading module includes a cylindrical platform disposed in the middle of the positioning base plate, a plurality of push rods movably disposed on the outer wall of the cylindrical platform and used to support the inner wall of the elastic valve seat, and a drive module that simultaneously drives the plurality of push rods to extend or retract radially along the cylindrical platform.

2. The positioning fixture for detecting the size of an elastic valve seat as described in claim 1, characterized in that: The positioning base plate is set on a three-coordinate measuring platform.

3. The positioning fixture for detecting the size of an elastic valve seat as described in claim 1, characterized in that: The upper surface of the positioning base plate serves as the reference surface for positioning the elastic valve seat. The elastic valve seat is placed horizontally on the positioning base plate and is fully in contact with the reference surface to facilitate the measurement of the height of the elastic valve seat.

4. The positioning fixture for detecting the size of an elastic valve seat as described in claim 1, characterized in that: Several push rods are evenly distributed at equal angles on the outer wall of the cylindrical platform, and the push rods extend horizontally with the same length.

5. A positioning fixture for detecting the size of an elastic valve seat as described in claim 1, characterized in that: Several of the aforementioned top rods are at the same height.

6. The positioning fixture for detecting the size of an elastic valve seat as described in claim 1, characterized in that: The top rod includes a telescopic rod and a conformal contact portion disposed at the front end of the telescopic rod and conforming to the inner wall of the elastic valve seat.

7. A positioning fixture for detecting the size of an elastic valve seat as described in claim 6, characterized in that: The contoured contact part is configured as a semi-cylindrical structure, with the side connected to the telescopic rod being flat and the side in contact with the elastic valve seat being arc-shaped.

8. The positioning fixture for detecting the size of an elastic valve seat as described in claim 1, characterized in that: The drive module is a hydraulic transmission device, which can control the clamping force, ejection speed and retraction speed of the push rod by adjusting the hydraulic pressure.

Images