Positioning tool for detecting cylindricity of inner hole of electro-hydraulic servo valve body

Abstract

The utility model relates to a positioning tool for detecting the cylindricity of an inner hole of a valve body of an electro-hydraulic servo valve, which is assembled on roundness measuring instrument detection equipment and comprises an installation column body, a clamping device, a positioning device and a positioning device, the installation column body is provided with a circular positioning and clamping surface and is matched with the clamping device on the roundness measuring instrument detection equipment, and the clamping device clamps the circular positioning and clamping surface; the valve body positioning seat is connected with the mounting column body and used for placing an electro-hydraulic servo valve body, and the electro-hydraulic servo valve body abuts against the valve body positioning seat, so that an inner hole in the electro-hydraulic servo valve body and the mounting column body are coaxially arranged; and the fixing device is used for fixing the electro-hydraulic servo valve body on the valve body positioning seat. The utility model provides a positioning tool for detecting the cylindricity of an inner hole of a valve body of an electro-hydraulic servo valve, which improves the measurement efficiency and ensures the consistency of measurement.

Description

Technical Field

[0001] This utility model relates to the technical field of servo valve testing equipment, and in particular to a positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve. Background Technology

[0002] In products like electro-hydraulic servo valves, the condition of the inner bore of the servo valve body, which mates with the valve core or valve sleeve, has a significant impact on the overall valve performance. Therefore, it is essential to inspect the condition of the inner bore, especially the measurement of the cylindricity of the inner bore.

[0003] To measure the cylindricity of the valve body's inner bore, the center of the valve body's inner bore must be aligned with the rotation center of the roundness measuring device. When measuring multiple valve bodies of the same type, the center position of the inner bore must be repeatedly aligned, which not only results in low measurement efficiency but also poor measurement consistency. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problems of low detection efficiency and poor measurement consistency when using roundness testing equipment to detect the cylindricity of the inner hole of an electro-hydraulic servo valve. The present invention provides a positioning fixture for detecting the cylindricity of the inner hole of an electro-hydraulic servo valve, which needs to be assembled on a roundness testing equipment. When measuring multiple valve bodies of the same type, it is only necessary to align the position during the first measurement so that the center of the inner hole of the valve body coincides with the rotation center of the roundness testing equipment. Subsequent measurements do not require secondary positioning, thereby improving measurement efficiency and ensuring measurement consistency.

[0005] To solve the above-mentioned technical problems, this utility model provides a positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve body, which is assembled on a roundness tester and includes:

[0006] The mounting column has a circular positioning clamping surface. The mounting column cooperates with the clamping device on the roundness tester, and the clamping device clamps the circular positioning clamping surface.

[0007] A valve body positioning seat is connected to the mounting column and is used to place the electro-hydraulic servo valve body. The electro-hydraulic servo valve body abuts against the valve body positioning seat, so that the inner hole in the electro-hydraulic servo valve body is coaxially set with the mounting column.

[0008] A fixing device is used to fix the valve body of the electro-hydraulic servo valve onto the valve body positioning seat.

[0009] In one embodiment of this utility model, the valve body positioning seat includes:

[0010] A first positioning plate is connected to the mounting column, and the first positioning plate has a first positioning surface that cooperates with the valve body of the electro-hydraulic servo valve.

[0011] The second positioning plate is connected to the first positioning plate, and the second positioning plate has a second positioning surface that cooperates with the valve body of the electro-hydraulic servo valve.

[0012] In one embodiment of this utility model, the first positioning plate and the second positioning plate are arranged vertically, and the second positioning plate is arranged on the first positioning surface.

[0013] In one embodiment of the present invention, the second positioning surface abuts against the side of the electro-hydraulic servo valve body.

[0014] In one embodiment of this utility model, the second positioning surface is configured to conformally engage with the valve body of the electro-hydraulic servo valve.

[0015] In one embodiment of this utility model, the fixing device includes:

[0016] Positioning holes are formed on the second positioning plate;

[0017] A positioning element passes through the valve body of the electro-hydraulic servo valve and is disposed in the positioning hole.

[0018] In one embodiment of this utility model, the positioning hole is a threaded hole, and the positioning element is a threaded bolt.

[0019] In one embodiment of this utility model, the electro-hydraulic servo valve body is provided with a through hole, and the position of the positioning hole is set according to the position of the through hole.

[0020] In one embodiment of the present invention, a plurality of positioning holes are provided on the second positioning plate, and a positioning element is inserted into each of the positioning holes.

[0021] In one embodiment of this utility model, the mounting column, the first positioning plate, and the second positioning plate are integrally formed.

[0022] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0023] The positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve body, as described in this utility model, needs to be assembled on a roundness tester. The mounting column has a circular positioning clamping surface that cooperates with the clamping device on the roundness tester to fix the entire positioning fixture. A valve body positioning seat is provided to hold the electro-hydraulic servo valve body, and a fixing device is provided to fix the valve body on the valve body positioning seat, ensuring that the inner bore of the electro-hydraulic servo valve body is coaxial with the mounting column. Thus, when the clamping device clamps the mounting column and rotates the entire fixture, the inner bore of the electro-hydraulic servo valve body remains in the same position, ensuring that the probe can penetrate the inner bore for cylindricity detection. When measuring multiple valve bodies of the same type, only the initial measurement is needed to align the valve body's inner bore with the rotation center of the roundness tester; subsequent measurements do not require secondary positioning, thereby improving measurement efficiency and ensuring measurement consistency. Attached Figure Description

[0024] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0025] Figure 1 This is a front structural schematic diagram of the positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve according to this utility model.

[0026] Figure 2 This is a side view of the positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve, according to this utility model.

[0027] Figure 3 This is a front view of the positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve after assembly.

[0028] Figure 4 This is a side view of the assembled positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve.

[0029] Explanation of reference numerals in the accompanying drawings: 1. Mounting column; 11. Circular positioning clamping surface; 2. Valve body positioning seat; 21. First positioning plate; 22. Second positioning plate; 23. First positioning surface; 24. Second positioning surface; 31. Positioning hole; 32. Positioning component; 4. Electro-hydraulic servo valve body; 41. Inner hole; 42. Through hole. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0031] Reference Figures 1-4 As shown, this utility model discloses a positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve. This positioning fixture needs to be assembled on a roundness testing device and includes: a mounting column 1, a valve body positioning seat 2, and a fixing device. The mounting column 1 has a circular positioning clamping surface 11, which can cooperate with the clamping device on the roundness testing device. The clamping device clamps the circular positioning clamping surface 11 to fix the entire positioning fixture. After the entire positioning fixture is fixed, the clamping device rotates, thereby also driving the entire positioning fixture to rotate. The valve body positioning seat 2 is connected to the mounting column 1 and is used to place the electro-hydraulic servo valve body 4. The electro-hydraulic servo valve body 4 abuts against the valve body positioning seat 2. The valve body positioning seat 2 positions the electro-hydraulic servo valve body 4, allowing the valve body to be positioned... The inner hole 41 of the electro-hydraulic servo valve body 4 is coaxially set with the mounting column 1. After determining the position of the electro-hydraulic servo valve body 4, the valve body 4 is fixed on the valve body positioning seat 2 by the fixing device. In this way, when the clamping device clamps the mounting column 1 and drives the entire fixture to rotate, the electro-hydraulic servo valve body 4 is always fixed on the positioning fixture, and the inner hole 41 of the electro-hydraulic servo valve body 4 is always in the same position, ensuring that the probe can penetrate into the inner hole 41 to detect its cylindricity. When measuring multiple valve bodies of the same type, it is only necessary to align the position during the first measurement so that the center of the inner hole 41 of the valve body coincides with the rotation center of the roundness measuring device. In subsequent measurements, there is no need for secondary positioning. It is only necessary to disassemble the fixing device and replace different valve bodies to be measured, thereby improving measurement efficiency and ensuring measurement consistency.

[0032] Normally, the inner hole 41 in the body 4 of the electro-hydraulic servo valve is set relatively eccentrically. If the body 4 of the electro-hydraulic servo valve in this embodiment is fixed at the center of the valve body positioning seat 2, in order to ensure that the inner hole 41 in the body 4 of the electro-hydraulic servo valve is coaxial with the mounting column 1, the mounting column 1 also needs to be set eccentrically relative to the valve body positioning seat 2.

[0033] Reference Figure 2As shown, in one embodiment of this utility model, the valve body positioning seat 2 includes: a first positioning plate 21 and a second positioning plate 22, wherein: the first positioning plate 21 is connected to the mounting column 1, the first positioning plate 21 has a first positioning surface 23 that cooperates with the electro-hydraulic servo valve body 4, the second positioning plate 22 is connected to the first positioning plate 21, the second positioning plate 22 has a second positioning surface 24 that cooperates with the electro-hydraulic servo valve body 4, the first positioning plate 21 and the second positioning plate 22 are arranged vertically, the second positioning plate is arranged on the first positioning surface, and the second positioning surface 24 abuts against the side of the electro-hydraulic servo valve body 4. By abutting against the second positioning surface 24 on one side of the electro-hydraulic servo valve body 4, the relative position of the electro-hydraulic servo valve body 4 and the second positioning plate 22 can be determined. The specific position of the electro-hydraulic servo valve body 4 in space can be determined by the two positioning surfaces of the two positioning plates. When assembling multiple valve bodies of the same type, as long as the electro-hydraulic servo valve body 4 is positioned and assembled on the second positioning surface 24, the accuracy of the assembly position can be guaranteed.

[0034] Specifically, the second positioning surface 24 is configured to conformally engage with the valve body 4 of the electro-hydraulic servo valve, in accordance with the reference... Figure 3 As shown, in this embodiment, the electro-hydraulic servo valve body 4 has a block-shaped structure. Therefore, the side of the electro-hydraulic servo valve body 4 that abuts against the second positioning surface 24 is a plane. It is sufficient to set the second positioning surface 24 to also be a plane. In other embodiments, if the electro-hydraulic servo valve body 4 has a spherical structure, the second positioning surface 24 can also be set to be a spherical surface to cooperate with the electro-hydraulic servo valve body 4.

[0035] Reference Figure 1 and Figure 4 As shown, in one embodiment of this utility model, the fixing device includes: a positioning hole 31 and a positioning element 32, wherein: the positioning hole 31 is formed on the first positioning plate 21 or the second positioning plate 22, and the positioning element 32 is set to pass through the electro-hydraulic servo valve body 4 and then set in the positioning hole 31, so that the electro-hydraulic servo valve body 4 and the first positioning plate 21 or the second positioning plate 22 are fixedly connected through the cooperation of the positioning hole 31 and the positioning element 32.

[0036] Specifically, refer to Figure 3 As shown, the electro-hydraulic servo valve body 4 is provided with a through hole 42, and the position of the positioning hole 31 is set according to the position of the through hole 42. In this way, without changing the structure of the electro-hydraulic servo valve body 4 itself, it can also be fixed on the positioning fixture of this embodiment.

[0037] Specifically, in one embodiment of this utility model, a plurality of positioning holes 31 are provided on the second positioning plate 22, and a positioning element 32 is provided in each of the positioning holes 31. The multiple positioning elements 32 are used to fix the electro-hydraulic servo valve body 4 together to ensure its stability.

[0038] Specifically, in order to facilitate the connection between the positioning hole 31 and the positioning element 32, in this embodiment, the positioning hole 31 is set as a threaded hole and the positioning element 32 is set as a threaded bolt. The positioning hole 31 and the positioning element 32 are connected by threads, which on the one hand ensures the stability of the connection, and on the other hand facilitates disassembly, enabling the rapid replacement of the valve body 4 of the electro-hydraulic servo valve under test.

[0039] Specifically, the mounting column 1, the first positioning plate 21, and the second positioning plate 22 are integrally formed, which on the one hand ensures the stability of its structure, and on the other hand facilitates its preparation and molding without the need for splicing.

[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve, assembled on a roundness tester, characterized in that: include: The mounting column has a circular positioning clamping surface. The mounting column cooperates with the clamping device on the roundness tester, and the clamping device clamps the circular positioning clamping surface. A valve body positioning seat is connected to the mounting column and is used to place the electro-hydraulic servo valve body. The electro-hydraulic servo valve body abuts against the valve body positioning seat, so that the inner hole in the electro-hydraulic servo valve body is coaxially set with the mounting column. A fixing device is used to fix the valve body of the electro-hydraulic servo valve onto the valve body positioning seat.

2. The positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve body according to claim 1, characterized in that: The valve body positioning seat includes: A first positioning plate is connected to the mounting column, and the first positioning plate has a first positioning surface that mates with the valve body of the electro-hydraulic servo valve. The second positioning plate is connected to the first positioning plate, and the second positioning plate has a second positioning surface that cooperates with the valve body of the electro-hydraulic servo valve.

3. The positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve body according to claim 2, characterized in that: The first positioning plate and the second positioning plate are arranged perpendicularly, and the second positioning plate is arranged on the first positioning surface.

4. The positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve body according to claim 2, characterized in that: The second positioning surface abuts against the side of the electro-hydraulic servo valve body.

5. The positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve body according to claim 2, characterized in that: The second positioning surface is configured to conform to the valve body of the electro-hydraulic servo valve.

6. The positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve body according to claim 2, characterized in that: The fixing device includes: Positioning holes are formed on the second positioning plate; A positioning element passes through the valve body of the electro-hydraulic servo valve and is disposed in the positioning hole.

7. The positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve body according to claim 6, characterized in that: The positioning hole is a threaded hole, and the positioning element is a threaded bolt.

8. The positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve body according to claim 6, characterized in that: The electro-hydraulic servo valve body is provided with a through hole, and the position of the positioning hole is set according to the position of the through hole.

9. The positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve body according to claim 6, characterized in that: Multiple positioning holes are provided on the second positioning plate, and a positioning element is inserted into each of the positioning holes.

10. The positioning fixture for detecting the cylindricity of the inner bore of an electro-hydraulic servo valve body according to claim 2, characterized in that: The mounting column, the first positioning plate, and the second positioning plate are integrally formed.

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