Method for measuring coaxiality of plug valve body

Abstract

This invention relates to the field of machining technology, specifically to a method for measuring the coaxiality of a plug valve body, comprising: S1, designing the structure of a measuring device; S2, manufacturing the measuring device; and S3, measuring the coaxiality of the plug valve body. In the embodiment of this invention, the light emitted by the laser emitter on the first and second baffles represents the horizontal axis of the valve body, and the light emitted by the laser emitter on the upper baffle represents the vertical axis. The point of illumination on the projection plate by the light representing the horizontal axis after reflection by a reflector is collinear with the point of illumination on the projection plate by the light representing the vertical axis, i.e., both are located on the second mark line. Therefore, it can be determined that the axis of the channel on the valve body intersects perpendicularly with the axis of the channel on the valve body used for installing the valve plug.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a method for measuring the coaxiality of a plug valve. Background Technology

[0002] A plug valve is a quick-opening straight-through valve. It opens or closes by rotating the plug to connect or separate the channel on the plug from the channel on the valve body. During the manufacturing process, it is necessary to ensure that the axis of the channel on the valve body and the channel on the valve body used for installing the plug are perpendicularly intersecting. This ensures that after the plug is installed and rotated, the channel on the plug and the channel on the valve body will not be misaligned. Otherwise, if misalignment occurs, the fluid passing through the plug will wash away the side of the valve seat after the plug is opened, thus reducing the service life of the plug valve.

[0003] Therefore, it is particularly important to accurately detect whether the axes of the channels on the valve body and the mounting channels for the valve plug are perpendicularly intersected after the valve body is machined. Thus, a tool that can quickly and accurately detect whether the axes of the channels and the mounting channels are perpendicularly intersected is urgently needed. Summary of the Invention

[0004] To address the above-mentioned problems, embodiments of the present invention provide a method for measuring the coaxiality of a plug valve body.

[0005] In one aspect, the present invention provides a method for measuring the coaxiality of a plug valve body, the method comprising:

[0006] S1. Measuring device structural design

[0007] The measuring device is designed to include a support frame and an upper baffle. A laser emitter is located at the center of the upper baffle. The support frame has a support plate and a projection plate arranged parallel to each other vertically. A circular groove is formed on the top surface of the support plate, and a light-transmitting hole is formed at the center of the groove. A first baffle and a second baffle are vertically arranged opposite each other on either side of the circular groove on the support plate, and both the first and second baffles are equipped with laser emitters. A support holder with a V-shaped groove is located between the circular groove and the first baffle on the support plate. A U-shaped bracket is positioned at the edge of the support plate opposite to the first and second baffles, and the U-shaped bracket is inclined upwards outwards from the support plate. Reflectors opposite to the first and second baffles are respectively mounted on the two U-shaped brackets. The center lines of the laser emitters on the first and second baffles and the V-shaped groove in the support holder are collinear in their projections onto the plane of the support plate and pass through the center of the circular groove.

[0008] S2. Measuring device fabrication

[0009] According to the design dimensions and shape, manufacture the support frame, support plate, projection plate, first baffle, second baffle, support bracket, U-shaped bracket and reflector. According to the inner diameter of the top ring of the valve body, manufacture the upper baffle and install the laser emitter in the center of the upper baffle.

[0010] Weld a support plate and a projection plate to the top and middle of the support frame. Make a first marking line and a second marking line on the support plate and the projection plate respectively. The first marking line and the second marking line are on the same vertical plane. Select a point on the first marking line on the support plate as the center of the circular groove, and make a circular groove according to the outer diameter of the bottom ring of the valve body. Then, make a light-transmitting hole through the support plate at the center of the circular groove.

[0011] Based on the length of the valve body and taking the first marking line as a reference, fix the first baffle and the second baffle on both sides of the circular groove, and fix the support bracket between the first baffle and the circular groove; based on the height of the horizontal axis of the valve body after the bottom ring of the valve body is inserted into the circular groove and one end of the valve body is inserted into the support bracket, install the laser emitter at the corresponding height position on the first baffle and the second baffle respectively.

[0012] Using the first marking line as a reference, install two U-shaped brackets on the edge of the support plate, and install the reflectors on the U-shaped brackets respectively;

[0013] S3. Measurement of coaxiality of plug valve body

[0014] Insert the bottom ring of the valve body into the circular groove, insert one end of the valve body into the support bracket, and insert the upper baffle horizontally into the top ring of the valve body. Power the three laser emitters. If the points of illumination on the projection board after the light emitted by the laser emitters on the first and second baffles is reflected by the reflector, and the points of illumination on the projection board after the light emitted by the laser emitter on the upper baffle is reflected by the light-transmitting hole, all of which are located on the second mark line, then the coaxiality of the plug valve body meets the requirements.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the light emitted by the laser emitter on the first baffle and the second baffle represents the horizontal axis of the valve body, and the light emitted by the laser emitter on the upper baffle represents the vertical axis. After the light representing the horizontal axis is reflected by the reflector, the illumination point on the projection plate is collinear with the illumination point on the projection plate of the light representing the vertical axis, that is, both are located on the second mark line. Then it can be determined that the axis of the channel on the valve body and the installation channel on the valve body for the valve plug intersects perpendicularly.

[0016] Optionally, the first baffle and the second baffle are fixed to the support plate by a sliding snap-fit ​​method. Specifically, a slot is opened on one side of the support plate at the final fixing position of the first baffle and the second baffle. The slot is perpendicular to the first marking line. After the first baffle and the second baffle slide to the final fixing position in the corresponding slot, the fixing rod is inserted into the slot. The fixing rod is used to press against the first baffle and the second baffle to complete the fixing.

[0017] Optionally, the U-shaped bracket includes an angle iron fixed to the support plate, with a U-shaped plate inclined upward on the angle iron, the end of the U-shaped plate bent into a slot, and the reflector inserted into the slot. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, are not intended to limit the scope of the invention. In the drawings:

[0019] Figure 1 A flowchart illustrating a method for measuring the coaxiality of a plug valve body, provided in an embodiment of the present invention;

[0020] Figure 2 This is a three-dimensional structural diagram of a measuring device provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the front view structure of a measuring device provided in an embodiment of the present invention;

[0022] Figure 4 A top view of a measuring device provided in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of a U-shaped bracket provided in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of a first baffle provided in an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of an upper baffle provided in an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of a support card holder provided in an embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of the structure of a support plate provided in an embodiment of the present invention;

[0028] Figure 10 This is a schematic diagram of a fixing rod provided in an embodiment of the present invention.

[0029] Among them, the support frame 1, upper baffle 2, laser emitter 3, support plate 4, projection plate 5, circular groove 6, light-transmitting hole 7, first baffle 8, second baffle 9, support bracket 10, U-shaped bracket 11, reflector 12, valve body 13, first marking line 14, second marking line 15, slot 16, and fixing rod 17 are included. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this invention are used to explain the invention, but are not intended to limit the invention.

[0031] See Figures 1-10 The present invention provides a method for measuring the coaxiality of a plug valve body, the method comprising:

[0032] S1. Measuring device structural design

[0033] The measuring device is designed to include a support frame 1 and an upper baffle 2. A laser emitter 3 is located at the center of the upper baffle 2. Support plates 4 and projection plates 5 are arranged vertically and parallel to each other within the support frame 1. A circular groove 6 is formed on the top surface of the support plate 4, and a light-transmitting hole 7 is formed at the center of the circular groove 6. A first baffle 8 and a second baffle 9 are vertically arranged opposite each other on both sides of the circular groove 6 on the support plate 4. Both the first baffle 8 and the second baffle 9 are equipped with laser emitters 3. A support bracket 10 with a V-shaped slot is provided between them; a U-shaped bracket 11 is provided at the edge of the support plate 4 opposite to the first baffle 8 and the second baffle 9. The U-shaped bracket 11 is inclined upward towards the outside of the support plate 4. Reflectors 12 opposite to the first baffle 8 and the second baffle 9 are respectively provided on the two U-shaped brackets 11; the center lines of the laser emitter 3 on the first baffle 8, the laser emitter 3 on the second baffle 9 and the V-shaped slot in the support bracket 10 are collinear in the orthographic projection of the plane where the support plate 1 is located and pass through the center of the circular groove 6;

[0034] S2. Measuring device fabrication

[0035] According to the design dimensions and shape, manufacture support frame 1, support plate 4, projection plate 5, first baffle 8, second baffle 9, support bracket 10, U-shaped bracket 11 and reflector 12. According to the inner diameter of the top ring of valve body 13, manufacture upper baffle 2 and install laser emitter 3 in the center of upper baffle 2.

[0036] Support plate 4 and projection plate 5 are welded to the top and middle of support frame 1. First marking line 14 and second marking line 15 are made on support plate 4 and projection plate 5 respectively. First marking line 14 and second marking line 15 are on the same vertical plane. A point on the first marking line 14 on support plate 4 is selected as the center of circular groove 6. Circular groove 6 is opened according to the outer diameter of the bottom ring of valve body 13. Then, a light-transmitting hole 7 is opened through support plate 4 at the center of circular groove 6.

[0037] Based on the length of the valve body 13 and taking the first marking line 14 as a reference, fix the first baffle 8 and the second baffle 9 on both sides of the circular groove 6, and fix the support bracket 10 between the first baffle 8 and the circular groove 6; based on the height of the horizontal axis of the valve body 13 after the bottom ring of the valve body 13 is inserted into the circular groove 6 and one end of the valve body 13 is inserted into the support bracket 10, install the laser emitter 3 at the corresponding height positions on the first baffle 8 and the second baffle 9 respectively;

[0038] Using the first marking line 14 as a reference, install two U-shaped brackets 11 on the edge of the support plate 4, and install the reflectors 12 on the U-shaped brackets 11 respectively;

[0039] S3. Measurement of coaxiality of plug valve body

[0040] Insert the bottom ring of valve body 13 into the circular groove 6, insert one end of valve body 13 into the support bracket 10, insert the upper baffle 2 horizontally into the top ring of valve body 13, supply power to the three laser emitters 3, and ensure that the illumination points on the projection plate 5 after the light emitted by the laser emitters on the first baffle 8 and the second baffle 9 are reflected by the reflector 12, and the illumination points on the projection plate 5 after the light emitted by the laser emitter 3 on the upper baffle 2 are reflected by the light-transmitting hole 7, are all located on the second mark 15, thus confirming that the coaxiality of the plug valve body meets the requirements.

[0041] In practice, the first baffle 8 and the second baffle 9 are fixed to the support plate 4 by sliding snap-fit. Specifically, the first baffle 8 and the second baffle 9 are provided with a slot 16 on one side of the support plate 4 at their final fixed positions. The slot 16 is perpendicular to the first marking line 14. After the first baffle 8 and the second baffle 9 slide to their respective slots 16 at their final fixed positions, the fixing rod 17 is inserted into the slots 16. The fixing is completed by the fixing rod 17 pressing against the first baffle 8 and the second baffle 9.

[0042] The U-shaped bracket 11 includes an angle iron fixed on the support plate 4. A U-shaped plate is inclined upward on the angle iron, and the end of the U-shaped plate is bent into a slot, into which the reflector is inserted.

[0043] The support frame 1 can be a rectangular frame welded from angle iron or channel steel; the laser emitter 3 is set perpendicular to its respective baffle, and the light-transmitting hole 7 can be a round hole structure or an elongated hole structure perpendicular to the first marking line 14; the upper and lower edges of the reflector 12 are parallel to the upper and lower edges of the first baffle 8 and the second baffle 9.

[0044] In the solution provided by this embodiment of the invention, the light emitted by the laser emitter on the first and second baffles represents the horizontal axis of the valve body, and the light emitted by the laser emitter on the upper baffle represents the vertical axis. After the light representing the horizontal axis is reflected by the reflector, the illumination point on the projection plate is collinear with the illumination point on the projection plate of the light representing the vertical axis, that is, both are located on the second mark line. Then it can be determined that the axis of the channel on the valve body and the installation channel on the valve body for the valve plug intersects perpendicularly.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A method of measuring the coaxiality of a stopcock valve body, characterized by, The method includes: S1. Measuring device structural design The measuring device is designed to include a support frame and an upper baffle. A laser emitter is located at the center of the upper baffle. The support frame has a support plate and a projection plate arranged parallel to each other vertically. A circular groove is formed on the top surface of the support plate, and a light-transmitting hole is formed at the center of the groove. A first baffle and a second baffle are vertically arranged opposite each other on either side of the circular groove on the support plate, and both the first and second baffles are equipped with laser emitters. A support holder with a V-shaped groove is located between the circular groove and the first baffle on the support plate. A U-shaped bracket is positioned at the edge of the support plate opposite to the first and second baffles, and the U-shaped bracket is inclined upwards outwards from the support plate. Reflectors opposite to the first and second baffles are respectively mounted on the two U-shaped brackets. The center lines of the laser emitters on the first and second baffles and the V-shaped groove in the support holder are collinear in their projections onto the plane of the support plate and pass through the center of the circular groove. S2. Measuring device fabrication According to the design dimensions and shape, manufacture the support frame, support plate, projection plate, first baffle, second baffle, support bracket, U-shaped bracket and reflector. According to the inner diameter of the top ring of the valve body, manufacture the upper baffle and install the laser emitter in the center of the upper baffle. Weld a support plate and a projection plate to the top and middle of the support frame. Make a first marking line and a second marking line on the support plate and the projection plate respectively. The first marking line and the second marking line are on the same vertical plane. Select a point on the first marking line on the support plate as the center of the circular groove, and make a circular groove according to the outer diameter of the bottom ring of the valve body. Then, make a light-transmitting hole through the support plate at the center of the circular groove. Based on the length of the valve body and taking the first marking line as a reference, fix the first baffle and the second baffle on both sides of the circular groove, and fix the support bracket between the first baffle and the circular groove; based on the height of the horizontal axis of the valve body after the bottom ring of the valve body is inserted into the circular groove and one end of the valve body is inserted into the support bracket, install the laser emitter at the corresponding height position on the first baffle and the second baffle respectively. Using the first marking line as a reference, install two U-shaped brackets on the edge of the support plate, and install the reflectors on the U-shaped brackets respectively; S3. Measurement of coaxiality of plug valve body Insert the bottom ring of the valve body into the circular groove, insert one end of the valve body into the support bracket, and insert the upper baffle horizontally into the top ring of the valve body. Power the three laser emitters. If the points of illumination on the projection board after the light emitted by the laser emitters on the first and second baffles is reflected by the reflector, and the points of illumination on the projection board after the light emitted by the laser emitter on the upper baffle is reflected by the light-transmitting hole, all of which are located on the second mark line, then the coaxiality of the plug valve body meets the requirements.

2. The method of measuring the coaxiality of a stopcock valve body of claim 1, wherein, The first and second baffles are fixed to the support plate by a sliding snap-fit ​​method. Specifically, a slot is opened on one side of the support plate at the final fixing position of the first and second baffles. The slot is perpendicular to the first marking line. After the first and second baffles slide to the final fixing position in the corresponding slots, the fixing rod is inserted into the slot. The fixing rod is used to press against the first and second baffles to complete the fixing.

3. The method of measuring the concentricity of a stopcock valve body of claim 1, wherein, The U-shaped bracket includes an angle iron fixed to a support plate, a U-shaped plate inclined upward on the angle iron, and a slot at the end of the U-shaped plate into which the reflector is inserted.

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