CN102506188B - Interchangeable processing technology for sealing surfaces of shutter and valve body - Google Patents

Abstract

The invention relates to a processing technology of an interchangeable ram and a sealing surface of a valve body, mainly: the processing technology of the sealing surface of the ram is: casting → surfacing of sealing surfaces on both sides → connecting hole and circumference of the ram → The connecting rod is installed in the connecting hole of the gate → the gate is installed on the horizontal tooling of the special plane with a fixed-slope power head through the connecting rod → the sealing surface on both sides of the gate is finely turned → the sealing surface on both sides of the gate is ground; the valve body The processing technology of the sealing surface is: casting → surfacing welding of the sealing surface on both sides → processing of the flanges on both sides → processing of the middle flange → installation of the middle flange on the right-angle fixture of the special machine through the turntable and the slope plate → sealing on one side of the valve body in fine turning Surface → Rotate the turntable 180° Finish turning the sealing surface on the other side of the valve body → Grind the sealing surface on one side of the valve body → Rotate the turntable 180° Grind the sealing surface on the other side of the valve body → Drill holes → Clean. It has the advantages of consistent wedge angle and interchangeability between gate plate and valve body sealing surface, and is suitable for processing wedge-shaped gate valve sealing surface and valve body sealing surface.

Description

A Processing Technology of Interchangeable Gate and Valve Body Sealing Surface

technical field

The invention relates to the field of valves, in particular to a processing method for a gate valve sealing pair. The invention is applicable to the processing of the gate valve gate plate sealing surface and the valve body sealing surface.

Background technique

The gate valve is composed of the sealing surface of the gate plate and the sealing surface of the valve body to form a sealing pair to realize the sealing function. The structural form of the sealing pair includes a flat sealing structure, a shrinking sealing structure and a wedge sealing structure. The wedge seal structure gate valve adopts the V-shaped wedge gate plate and the V-shaped sealing surface of the inlet and outlet channels of the valve body to cooperate with each other to form a sealing pair. In the gate valve with wedge seal structure, the movement direction of the wedge gate is perpendicular to the direction of the fluid, and the sealing surface is easy to wear, which is a wearing part. Therefore, the interchangeability of the wedge gate can facilitate the maintenance of the gate valve or the replacement of the gate. The interchangeability of the wedge ram must be guaranteed by the processing technology of the sealing surface of the wedge ram and the sealing surface of the valve body. The processing technology of the existing wedge ram sealing surface is: casting→surfacing welding on both sides of the sealing surface→turning The connecting hole and circumference of the gate → the sealing surface of one side of the up-slope tooling chuck car washing → the gate plate is turned 180° and the sealing surface of the other side of the up-slope tooling chuck is car-washed → the upper surface grinder is used to grind one side of the tooling chuck Sealing surface→The gate plate is turned 180°, and the surface grinder is used to grind the other side of the sealing surface with the inclination tooling chuck. The processing technology of the valve body is: casting → surfacing welding of sealing surfaces on both sides → processing of flanges on both sides → processing of middle flange → taking the flange plane of the inlet side as the reference plane with slope tooling to wash the sealing surface of the outlet side → using the method of the outlet side The blue plane is the inclination of the reference plane. Tooling car washes the inlet side sealing surface → grinds the two side sealing surfaces respectively → drills → cleans. The slope angle of the slope tooling is 1/2 of the wedge angle of the gate or valve body sealing surface. For valves with a diameter greater than or equal to 1m, the slope angle of the slope tooling is 3°. For valves with a diameter of less than 1m, its The slope angle of the slope tooling is 5°. Its main disadvantage is: the car washing or grinding of the sealing surfaces on both sides of the gate and the valve body is completed by two clamping operations on the same inclination tooling, that is, after the sealing surface on one side is car washed or ground, the gate or the valve body Turn it around 180° and install it on the inclined tooling and then car wash or grind the sealing surface on the other side. There are errors in each installation operation, which makes the processing errors of the sealing surfaces on both sides inconsistent, and the sealing of each gate and valve body after processing The surface wedge angles are also inconsistent, so that the gate and the sealing surface of the valve body can only be matched one by one, and any gate can not be used in conjunction with the sealing surface of the valve body, and the interchangeability is poor.

Contents of the invention

The object of the present invention is to aim at the shortcomings of the prior art, to provide a kind of gate plate and valve body sealing surface with consistent processing error, each gate plate and valve body sealing surface wedge angle consistency is good, and the gate plate can be connected with any valve body sealing surface. Used together, the processing technology of the interchangeable ram and the sealing surface of the valve body is high in processing precision and good in interchangeability.

The technical solution of the present invention includes the processing technology of the gate sealing surface and the valve body sealing surface, mainly:

The processing technology of the gate sealing surface is as follows: casting→surfacing welding on both sides of the sealing surface→connecting hole and circumference of the brake plate→installing a connecting rod in the connecting hole of the gate→installing the gate on a fixed-slope power through the connecting rod. On the horizontal tooling of the special plane of the head → finish turning of the sealing surfaces on both sides of the ram, the sealing surfaces on both sides of the ram are finished turning at the same time → the sealing surfaces on both sides of the ram are ground, and the sealing surfaces on both sides of the ram are ground simultaneously;

The processing technology of the sealing surface of the valve body is: casting→sealing surface welding on both sides→flange processing on both sides→middle flange processing→middle flange is installed on the right-angle fixture of the special machine through the turntable and slope plate→finishing valve The sealing surface on one side of the valve body → turn the turntable 180° to finish the sealing surface on the other side of the valve body → grind the sealing surface on one side of the valve body → rotate the turntable 180° to grind the sealing surface on the other side of the valve body → drill holes → clean.

The advantage of the present invention is that it adopts two processes of installing the connecting rod in the connecting hole of the ram and installing the ram on the horizontal tooling of the special plane with a fixed-slope power head through the connecting rod, and the ram is installed in the connecting hole through the two processes. The connecting rod is installed on the horizontal tooling of the special machine, and the turning and grinding of the sealing surfaces on both sides are completed by the cutter head and the grinding disc of the special machine at the same time. The sealing surface has the same processing accuracy and wedge angle; the sealing surface on both sides of the valve body is turned and ground using the middle flange through the turntable and the slope plate to install it on the right-angle fixture of the special machine, and the sealing surface on both sides of the valve body is completed by rotating the turntable 180° Car and grind, so that the machining accuracy and wedge angle of the sealing surfaces on both sides of each valve body are consistent. Ensure that the sealing surface of each ram has the same wedge angle as the sealing surface of the valve body, the machining accuracy is high, the consistency is good, and the rams are interchangeable.

Description of drawings

Fig. 1 is a schematic diagram of the gate sealing surface car and grinding process equipment of the present invention.

Fig. 2 is a schematic diagram of the valve body sealing surface turning or grinding process equipment of the present invention.

Detailed ways

The processing technology of the interchangeable gate and valve body sealing surface of the present invention includes the processing technology of the gate sealing surface and the processing technology of the valve body sealing surface.

The processing technology of the gate sealing surface is: casting→surfacing welding on both sides of the sealing surface→connecting hole and circumference of the brake plate→installing the connecting rod in the connecting hole of the brake plate→installing the gate on the special plane with a fixed-slope power head through the connecting rod Horizontal tooling → fine turning of the sealing surfaces on both sides of the ram → grinding of the sealing surfaces on both sides of the ram. The casting process casts the planes on both sides of the gate into a wedge-shaped structure. The wedge angle of the plane on one side of the gate used for gate valves with a diameter greater than or equal to one meter is 3°, and the plane on one side of the gate used in gate valves with a diameter of less than one meter The wedge angle is 5°; the surfacing welding process of the sealing surface is to surfacing hard alloy on the sealing surface on both sides of the gate plate to improve the wear resistance of the sealing surface; The connecting hole and the plane of the connection between the circumferential surface and the valve stem; the process of installing the connecting rod in the connecting hole of the gate is to install a connecting rod 8 in the connecting hole between the gate and the valve stem, and the connecting rod 8 fixes the gate 7 on the On the horizontal tooling 4 of the special plane; the finish turning and grinding process of the sealing surfaces on both sides of the gate adopts the simultaneous finish turning and grinding of the sealing surfaces on both sides of the gate, that is, the power head 5 with a fixed slope is symmetrically installed on both sides of the horizontal tooling 4 of the special plane, The power head 5 is installed on the workbench 1 through the slope block 3. When processing a gate valve with a diameter greater than or equal to one meter, the angle between the slope block 3 and the horizontal plane is 3°. When processing a gate valve with a diameter less than one meter When the ram is used, the angle between the slope block 3 and the horizontal plane is 5°, the cutter head 6 is installed on the power head 5 on both sides of the ram 7, and the finish turning is carried out on both sides of the ram 7; When grinding on the side, the cutter head 6 is replaced by a grinding disc, and a limit switch 2 is provided on the horizontal tooling 4 to limit the moving position of the power head 5 on the workbench 1, as shown in Figure 1. The power head 5 is installed on the workbench 1 through the inclination block 3, so that the cutter head 6 or the grinding disc has a fixed inclination angle, and the machining accuracy of the sealing surface of each gate 7 is consistent with the wedge angle, which is interchangeable.

The processing technology of the sealing surface of the valve body is: casting → surfacing welding of the sealing surface on both sides → processing of flanges on both sides → processing of the middle flange → installation of the middle flange on the right-angle fixture of the special machine through a turntable and a slope plate → finishing turning of the valve body Side sealing surface→rotate the turntable 180°finish the sealing surface on the other side of the valve body→grind the sealing surface on one side of the valve body→rotate the turntable 180° to grind the sealing surface on the other side of the valve body→drill holes→clean. The casting process casts the sealing surface of the valve body into a wedge-shaped structure. The wedge angle of the sealing surface on one side of the valve body with a diameter greater than or equal to one meter is 3°, and the wedge angle of the sealing surface on one side of the valve body with a diameter of less than one meter is 5°. The surfacing welding process of the sealing surface is to surfacing hard alloy on the sealing surfaces on both sides of the valve body to improve the wear resistance of the sealing surface; 5, the slope angle of the slope plate 3 is equal to the wedge angle of the sealing surface of the valve body 2, and the pressure plate 4 is installed between the middle flange of the valve body 2 and the turntable 6, and the turntable 6 can be rotated 180° and fixed at the slope The plate 3 and the right-angle fixture 5 are fixedly installed on the machine base 1 of the special machine. The axis of the tool 7 is perpendicular to the sealing surface of the valve body 2. By rotating the turntable 6 by 180°, the turning and grinding of the sealing surfaces on both sides of the valve body 2 are realized. The machining accuracy of the sealing surfaces of different valve bodies 2 and the consistency of the wedge angle are maintained at a high degree, so that the valve body 2 can be interchangeably used with different gate plates 7 having the same wedge angle.

Claims (1)

1. A processing technology for an interchangeable ram and a valve body sealing surface, including a processing technology for a ram sealing surface and a valve body sealing surface, characterized in that: The processing technology of the gate sealing surface is as follows: casting→surfacing welding on both sides of the sealing surface→connecting hole and circumference of the brake plate→installing a connecting rod in the connecting hole of the gate→installing the gate on a fixed-slope power through the connecting rod. On the horizontal tooling of the special plane of the head → finish turning of the sealing surfaces on both sides of the ram, the sealing surfaces on both sides of the ram are finished turning at the same time → the sealing surfaces on both sides of the ram are ground, and the sealing surfaces on both sides of the ram are ground simultaneously; The processing technology of the sealing surface of the valve body is: casting→sealing surface welding on both sides→flange processing on both sides→middle flange processing→middle flange is installed on the right-angle fixture of the special machine through the turntable and slope plate→finishing valve The sealing surface on one side of the valve body → turn the turntable 180° to finish the sealing surface on the other side of the valve body → grind the sealing surface on one side of the valve body → rotate the turntable 180° to grind the sealing surface on the other side of the valve body → drill holes → clean.

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