Method for clamping valve body of high-pressure plug valve

Abstract

The invention relates to the technical field of machining, in particular to a high-pressure plug valve body clamping method and manufacturing of a valve body clamp which comprises a base, a left pressing plate and a right pressing plate. Valve body bottom machining is conducted, specifically, the valve body bottom is flattened through a machine tool, and a second positioning pin shaft hole is machined; the valve body is installed, the base is installed on a machine tool spindle flange plate, then the bottom of the valve body is connected with the base through a positioning pin shaft, and finally the exterior of a to-be-machined valve body channel is pressed and fixed through a left pressing plate and a right pressing plate. The tool is not affected by the size specification of the valve body, the valve body can be rapidly installed and fixed without measurement, the auxiliary time generated by centering of the valve body is shortened, operation is easy, clamping is firm and reliable, and the machining efficiency of the valve body is improved.

Description

Technical Field

[0001] The invention relates to the technical field of machining, in particular to a method for clamping a valve body of a high-pressure plug valve. Background Art

[0002] As an efficient and fast through-control valve, the core working principle of high-pressure plug valve is to accurately control the opening and closing of the fluid passage by rotating the valve plug. In this process, the channel on the valve plug needs to be accurately aligned or separated from the valve body channel to achieve smooth passage of the fluid or effective cutoff of the fluid. In the mechanical processing of the plug valve body, a crucial step is to ensure that the axis of the valve body channel used for fluid circulation and the installation channel designed for the valve plug and arc sheet must maintain a strict vertical intersection relationship. Strict compliance with this design requirement is the key to ensuring the subsequent operating performance and service life of the plug valve. Specifically, only when the axes of the two intersect vertically, the valve plug channel on it can accurately dock with the valve body channel after the valve plug is installed and rotated to the specified position, avoiding any form of misalignment. Because once the channel is misaligned, it will not only cause the fluid to fail to pass normally and efficiently when the plug valve is in the open state, but it may also cause abnormal scouring of the valve seat on the valve plug by the fluid. This scouring action will accelerate the wear of the valve seat and surrounding components, thereby significantly shortening the overall service life of the plug valve.

[0003] The existing patent CN209774054U discloses a rough processing tool for the inner cavity of a plug valve, the purpose of which is only to ensure the clamping of the plug valve during processing and to ensure processing stability; the tool can only be used for valve bodies of specific sizes, specifically when the horizontal axis of the valve body passes through the center of the circular plate-shaped base, the axis between the valve body channel and the valve plug installation channel on the valve body can intersect vertically after processing; for valve bodies of other sizes, since the diameters of the two ends of the valve body are either large or small, the horizontal axis of the valve body will be offset and will not pass through the center of the circular plate-shaped base, resulting in the channel on the valve body after processing and the axis between the valve plug installation channel on the valve body cannot intersect vertically. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a high-pressure plug valve body clamping method, which can quickly install and fix valve bodies of different specifications, reduce the fixing time, and has good versatility.

[0005] The technical solution adopted by the present invention to solve its technical problem is: A high-pressure plug valve body clamping method is performed according to the following steps: S1. Production of valve body fixture The fixture includes a base, a left pressure plate and a right pressure plate. A positioning pin hole is provided at the center of the base. A plurality of mounting holes corresponding to the fixing holes on the flange of the machine tool spindle are provided around the positioning pin hole. The base is connected to the machine tool spindle through a bolt assembly penetrating the fixing hole and the mounting hole. The bottoms of the left and right pressure plates are respectively provided with arc grooves, which are adapted to the outer wall of the valve body channel to be processed; S2. Valve body bottom processing The second positioning pin hole is processed at the center of the bottom of the valve body by a machine tool, and the second positioning pin hole can be connected with the first positioning pin hole through a positioning pin shaft; S3, Valve body installation Connect the base to the machine tool spindle flange through the mounting hole, connect the bottom of the valve body to the base through the positioning pin, and then use the left and right pressure plates to press the outer walls of the valve body channels to be processed on both sides of the valve body, and use the bolt assembly to connect and fix the left and right pressure plates to the base respectively; thus, the valve body is clamped.

[0006] Compared with the prior art, the present invention has the following beneficial effects: The present invention is not affected by the size specifications of the valve body. The valve body can be quickly installed and fixed without measurement, and the central axis of the valve body channel to be processed is perpendicularly intersected with the central axis of the valve plug installation channel, thereby reducing the auxiliary time generated by valve body center alignment. The operation is simple, the clamping is firm and reliable, and the valve body processing efficiency is improved.

[0007] Further, the preferred embodiment adopted by the present invention is: The central axis of the first positioning pin hole, the central axis of the second positioning pin hole and the central axis of the positioning pin shaft all coincide with the central axis of the machine tool spindle.

[0008] The left pressure plate and the right pressure plate are provided with various specifications according to the outer edge diameter of the valve body passage, so that the arc grooves on the left pressure plate and the right pressure plate can be suitable for valve body passages of different sizes, thereby improving the versatility of the valve body fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic diagram of a flow chart in an embodiment of the present invention; Figure 2 is a schematic structural diagram of the connection between the valve body and the base in an embodiment of the present invention; Figure 3 In the embodiment of the present invention Figure 2 A top view of Figure 4 is a schematic structural diagram of a left pressure plate in an embodiment of the present invention; Figure 5 is a schematic structural diagram of the right pressure plate in an embodiment of the present invention; Figure 6is a structural schematic diagram of a base in an embodiment of the present invention; Figure 7 is a schematic structural diagram of a positioning pin shaft in an embodiment of the present invention; Explanation of the reference numerals in the accompanying drawings: 1. Base; 2. Valve body; 201. Valve body channel to be processed; 3. Left pressure plate; 4. Right pressure plate; 5. Mounting hole; 6. Arc groove; 7. Pressure plate positioning hole; 8. Pressure plate fixing hole; 9. Positioning pin hole one; 10. Positioning pin hole two; 11. Positioning pin shaft. DETAILED DESCRIPTION

[0010] In order to make the purpose, technical solutions and beneficial effects of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments. The purpose is only to better understand the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0011] The present invention relates to a high-pressure plug valve body clamping method, such as Figures 1 to 7 As shown, follow the steps below: S1. Production of valve body fixture The fixture of the valve body 2 is composed of a base 1, a left pressure plate 3 and a right pressure plate 4. The base 1 is used to connect with the flange of the machine tool spindle, and the left pressure plate 3 and the right pressure plate 4 are used to clamp the outer wall of the valve body channel 201 to be processed. The specific structure is as follows: The base 1 is manufactured according to the design structure of the fixture. The base 1 in this embodiment is circular, and a locating pin hole 9 is opened at the center of the base 1. A locating pin shaft 11 is inserted into the locating pin hole 9. Then, a plurality of mounting holes 5 are opened around the locating pin hole 9. The mounting holes 5 are arranged in a one-to-one correspondence with the fixing holes on the machine tool spindle flange. The base 1 is connected to the machine tool spindle flange by a bolt assembly passing through the mounting holes 5 and the fixing holes.

[0012] The left pressure plate 3 and the right pressure plate 4 are manufactured according to the design structure of the fixture, and arc grooves 6 adapted to the left and right ends of the valve body 2 are respectively opened at the bottom of the left pressure plate 3 and the right pressure plate 4, and the curvature of the arc groove 6 is adapted to the outer edge curvature of the valve body channel 201 to be processed, so as to ensure that the arc grooves 6 at the bottom of the left pressure plate 3 and the right pressure plate 4 can be clamped at the two ends of the valve body 2; pressure plate positioning holes 7 are also respectively opened at the front and rear ends of the left pressure plate 3 and the right pressure plate 4, and pressure plate fixing holes 8 are respectively opened at the base 1 corresponding to the pressure plate positioning holes 7 on the left pressure plate 3 and the right pressure plate 4, and the left pressure plate 3 and the right pressure plate 4 are respectively connected and fixed to the base 1 by bolt assemblies penetrating the pressure plate positioning holes 7 and the pressure plate fixing holes 8, so that the valve body 2 can be pressed and fixed.

[0013] S2, valve body 2 bottom processing A locating pin hole 10 is processed at the center of the bottom of the valve body 2 by a machine tool. The locating pin hole 10 is matched with the locating pin shaft 11. One end of the locating pin shaft 11 is placed in the locating pin hole 9, and the other end is placed in the locating pin hole 10. The bottom of the valve body 2 is connected to the base 1 through the locating pin shaft 11. Before drilling, the bottom end surface of the valve body 2 is first leveled by a machine tool, and then drilling is performed to ensure that the central axis of the locating pin hole 10 is perpendicular to the bottom end surface of the valve body 2.

[0014] S3, valve body 2 installation Connect and fix the base 1 to the flange of the machine tool spindle, then insert one end of the locating pin shaft 11 into the locating pin hole 1 9 in the center of the base 1 and fix it thereto, and insert the other end into the locating pin hole 2 10 at the bottom of the valve body 2, so that the bottom of the valve body 2 contacts the surface of the base 1, and then clamp the two ends of the valve body 2 through the left pressure plate 3 and the right pressure plate 4, and adjust the positions of the left pressure plate 3 and the right pressure plate 4 and lock them through the bolt assembly to ensure that the central axis of the valve body channel 201 to be processed is perpendicular to the central axis of the machine tool spindle, and the valve body 2 is clamped.

[0015] In this embodiment, the central axis of the machine tool spindle, the central axis of the positioning pin hole 1 9 , the central axis of the positioning pin shaft 11 and the central axis of the positioning pin hole 2 10 all coincide with each other.

[0016] In the present embodiment, valve bodies of different specifications have different diameters of valve body channels. In the present embodiment, multiple groups of left pressure plates and right pressure plates may be provided according to valve bodies of different specifications, so that the arc grooves at the bottom of the left pressure plates and the right pressure plates are adapted to the diameter of the outer edge of the valve body channels, thereby improving the versatility of the clamp.

[0017] The present invention can quickly install and fix the valve body and the machine tool spindle without measuring, reduces the auxiliary time generated by the valve body center alignment, is simple to operate, saves time, and has reliable clamping, thereby improving the efficiency of valve body processing.

[0018] The above description is only the preferred embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made by using the contents of the present invention specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A high-pressure plug valve body clamping method, characterized in that: Follow these steps: S1. Production of valve body fixture The fixture comprises a base, a left pressure plate and a right pressure plate. A positioning pin hole is arranged at the center of the base. A plurality of mounting holes corresponding to the fixing holes on the flange of the machine tool spindle are evenly arranged around the positioning pin hole. The base is connected to the machine tool spindle through a bolt assembly penetrating the fixing hole and the mounting hole. The bottoms of the left and right pressure plates are respectively provided with arc grooves, which are adapted to the outer wall of the valve body channel to be processed; S2. Valve body bottom processing A second positioning pin hole is processed at the center of the bottom of the valve body by a machine tool, and the second positioning pin hole is connected to the first positioning pin hole through a positioning pin shaft; S3, Valve body installation Connect the base to the spindle flange of the machine tool through the mounting hole, connect the bottom of the valve body to the base through the positioning pin, and then use the left pressure plate and the right pressure plate to press the outer wall of the valve body channel to be processed on both sides of the valve body, and use the bolt assembly to connect and fix the left pressure plate and the right pressure plate to the base respectively; thus, the valve body is clamped.

2. The high-pressure plug valve body clamping method according to claim 1, characterized in that: The central axis of the first positioning pin hole, the central axis of the second positioning pin hole and the central axis of the positioning pin shaft all coincide with the central axis of the machine tool spindle.

3. The high-pressure plug valve body clamping method according to claim 1, characterized in that: The left pressure plate and the right pressure plate are provided with various specifications according to the outer edge diameter of the valve body passage.

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