CN103341652B - For the accurately quick boring technological equipment of double eccentric butterfly valve - Google Patents

Abstract

The invention discloses a precise and fast boring tool for a double eccentric butterfly valve, which includes a workbench (9), a valve body positioning ring (2), a valve plate positioning ring (3) and a tooling bottom plate (7), and also includes a It is used to align the positioning core in the center of the workpiece. The positioning core includes the base (5) and the raised part (6) on the upper part of the base. The raised portion extends into the tooling base plate through the bottom plate hole (4) at the center of the tooling base plate, and the diameter of the base plate hole is slightly larger than the diameter of the raised portion of the positioning core. The beneficial effect of the present invention is that the purpose of eccentricity is achieved through the deviation design of the diameter of the bottom plate hole in the center of the tooling bottom plate and the diameter of the protrusion of the positioning core, without repeated shaking of the workbench for alignment, reducing cumulative errors, high processing accuracy, and fast processing speed.

Description

Accurate and quick boring tooling for double eccentric butterfly valves

technical field

The invention relates to tooling, in particular to an accurate and fast boring tooling for double eccentric butterfly valves.

Background technique

The center of rotation of the valve plate of the double eccentric valve (that is, the center of the valve shaft) forms an offset of dimension a with the sealing section of the valve plate, and forms an offset of dimension b with the centerline of the valve body. The sealing principle is that when the double eccentric sealing butterfly valve is in When fully open, the sealing surface of the valve plate will be completely separated from the sealing surface of the valve seat, and a gap x will be formed between the sealing surface of the valve plate and the sealing surface of the valve seat. The radius is divided into long-radius rotation and short-radius rotation. On the large semicircle of the valve plate with long-radius rotation, the tangent line of the rotation track of the sealing surface of the valve plate will form a θ angle with the sealing surface of the valve seat, so that the valve plate is sealed when the valve plate is opened and closed. Compared with the sealing surface of the valve seat, the sealing surface has a function of gradually moving out and gradually entering and squeezing, so as to reduce the mechanical wear and abrasion between the two sealing surfaces of the butterfly valve sealing pair when the valve plate is opened and closed. At present, the double eccentric butterfly valve is widely used, the sealing surface is narrow, and the processing requirements are high. Double eccentric butterfly valve valve body valve plate boring tooling mostly adopts a tooling base plate with two positioning rings, and the tooling base plate is placed on the workbench for boring. This kind of boring can't measure whether the bottom plate surface of the tooling is parallel to the worktable surface, and can't know whether the workpiece positioning center and the spindle boring center are parallel and coincident, and it is very likely to produce a slight deviation in a small angle. At the same time, before boring, first shake the worktable vertically so that the tooling and workpiece positioning centerline coincides with the spindle boring centerline, and then continue to shake the worktable longitudinally to make the tooling and workpiece positioning centerline coincide with the spindle boring centerline. Eccentricity required. However, repeated shaking will produce cumulative errors, and at the same time greatly reduce the processing speed. Even the processed butterfly valve cannot guarantee the concentricity of the bore and the eccentricity required by the butterfly valve. Due to the relative mechanical wear between the sealing surfaces of the seat and the shortening of the extruding angle stroke, the leakage of the butterfly valve cannot be guaranteed. Especially for the double eccentric hard-sealed butterfly valve, problems such as water leakage and large torque during use are caused by inaccurate boring of the butterfly valve. of.

Contents of the invention

The technical problem to be solved by the present invention is that it is complicated to find the eccentricity of most of the current double eccentric butterfly valve valve body valve plate boring tooling. Repeatedly shaking the workbench to find the eccentricity will cause cumulative errors, low processing accuracy and slow processing speed. . Lack of calibration positioning, the bore of the processed butterfly valve has low concentricity. Therefore, it is not necessary to repeatedly shake the workbench to find the eccentricity, and there is no cumulative error and high machining accuracy. Accurate and fast boring tooling for double eccentric butterfly valves.

The technical solution of the present invention is: a precise and fast boring tool for double eccentric butterfly valves, which includes a workbench, a valve body positioning ring, a valve plate positioning ring and a tooling bottom plate, and it also includes a positioning core for aligning the center of the workpiece, The positioning core includes a base body and a raised portion on the upper part of the base body, a central hole is provided on the workbench, and the base body of the positioning core is interference-fitted in the center hole, and the raised portion of the positioning core passes through the tooling The bottom plate hole in the center of the bottom plate extends into the tooling bottom plate, and the diameter of the bottom plate hole is slightly larger than the diameter of the raised portion of the positioning core.

The improvement of the above solution is that a correction plate is detachably connected to one end of the tooling base plate.

The cross-sectional shapes of the valve body positioning ring and the valve plate positioning ring in the above solution are adapted to the valve body and valve plate to be processed respectively.

The beneficial effect of the present invention is that eccentricity is achieved through the design of the deviation between the diameter of the bottom plate hole in the center of the tooling bottom plate and the diameter of the protrusion of the positioning core, without repeated shaking of the workbench for alignment, reducing cumulative errors, high processing accuracy, and fast processing speed. The correction plate can firstly correct whether the center line of the workbench, the valve body positioning ring and the valve plate positioning ring are vertical; the second is to correct whether the center line of the valve body tail coincides with the center line of the spindle boring hole; the third is to determine whether the valve body and the valve plate head The tail direction can't be mistaken.

Description of drawings

Fig. 1 is a sectional view of the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a schematic diagram of the positioning core in Fig. 1;

Fig. 4 is a schematic diagram of the use of the present invention;

In the figure, 1. Calibration plate, 2. Valve body locating ring, 3. Valve plate locating ring, 4. Bottom plate hole, 5. Base body, 6. Raised part, 7. Tooling bottom plate, 8. Fixing bolt, 9. Work tower.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Fig. 1, Fig. 2 and Fig. 3, the present invention includes a workbench 9, a valve body positioning ring 2, a valve plate positioning ring 3 and a tooling base plate 7, and it also includes a positioning core for aligning the center of the workpiece, and the positioning core Including the base body and the raised portion on the upper part of the base body, a central hole is provided on the workbench, and the base body 5 of the positioning core is interference fit in the center hole, and the raised portion 6 of the positioning core extends into the tooling base plate through the base plate hole 4 in the center of the tooling base plate Inside, and the diameter of the bottom plate hole is slightly larger than the diameter of the raised part of the positioning core.

Embodiment 1: Process the valve body positioning ring and the valve plate positioning ring and install them on the tooling base plate. The diameter of the base of the positioning core is ΦA=70mm, and the diameter of the center hole of the corresponding workbench is ΦB=70mm, so that the base of the positioning core Interference fit with the center hole of the workbench, the diameter of the raised part of the positioning core is d=55.6mm, the diameter of the bottom plate hole in the center of the tooling base plate is D=60mm, and the raised part of the positioning core is aligned with the edge of the bottom plate hole in the center of the tooling base plate The eccentricity b can be generated by approaching, the formula is b=(D-d)/2=2.2mm, and the directionality of the eccentricity is consistent with the eccentricity of the valve body and the valve plate.

Embodiment 2: Process the valve body positioning ring and the valve plate positioning ring and install them on the tooling base plate. The diameter of the base of the positioning core is ΦA=80mm, and the diameter of the center hole of the corresponding workbench is ΦB=80mm, so that the base of the positioning core Interference fit with the center hole of the workbench, the diameter of the raised part of the positioning core is d=56mm, the diameter of the bottom plate hole in the center of the tooling base plate is D=59mm, and the raised part of the positioning core is approached to the edge of the bottom plate hole in the center of the tooling base plate Eccentricity b can be generated, the formula is b=(D-d)/2=1.5mm, and the eccentric direction is consistent with the eccentric direction of the valve body and disc.

From the above two embodiments, it can be seen that the diameter D of the bottom plate hole and the diameter d of the protrusion of the positioning core can be designed according to the needs, and the required eccentricity can be obtained according to the formula b=(D-d)/2, without repeatedly shaking the workbench to find the eccentricity. The required eccentricity is thus automatically produced. This kind of precise eccentricity will not produce cumulative error, high machining accuracy and fast machining speed.

A preferred example of the present invention is that a correction plate 1 is detachably connected to one end of the tooling base plate. A groove can be processed at one end of the tooling base plate, and a tenon can be provided on the correction plate, and the detachable connection can be realized by matching the groove and the tenon, or a concave block can be provided at one end of the tooling base plate, and a bump can be provided on the correction plate. The concave block and the convex block realize the detachable connection. Insert the correction plate into one end of the tooling base plate when calibration is required, and judge whether the center line of the workbench, valve body positioning ring 2, and valve plate positioning ring 3 is vertical according to whether the correction plate is vertical; the end where the correction plate is located is the valve body and the tail of the valve plate, so that the position of the valve body and the valve plate can be determined according to the position of the calibration plate, and the direction of the head and tail of the valve body and the valve plate will not be mistaken; Whether the tail centerline coincides with the spindle bore centerline. The calibration plate can be pulled out when not needed.

In the present invention, the shapes of the cross section and the longitudinal section of the valve body positioning ring and the valve plate positioning ring should be adapted to the valve body and the valve plate respectively, so that the valve body and valve plate to be processed can be stably placed on the tooling.

The assembly process of the present invention is as follows: the base diameter ΦA of the positioning core and the diameter ΦB of the center hole of the worktable are processed into equal diameters, that is, ΦA=ΦB, and processed into an interference fit. Then the valve body locating ring, valve plate locating ring, and tooling bottom plate are welded and processed, and then the valve body locating ring and valve plate locating ring will be processed in place. The center positioning can be achieved by putting the bottom plate hole of the tooling bottom plate on the raised part of the positioning core and quickly aligning. The tooling base plate is fixedly connected with the workbench through fixing bolts 8 . There is no need to repeatedly shake the table, the tooling and workpiece positioning centerline can quickly coincide with the spindle boring centerline.

The working process of the present invention is shown in Figure 4. First, the butterfly valve to be bored is placed on the tooling base plate, the valve body of the butterfly valve is correspondingly placed on the valve body positioning ring on the tooling base plate, and the valve plate of the butterfly valve is correspondingly placed on the tooling base plate. On the valve plate positioning ring of the bottom plate, after the butterfly valve is placed stably, insert the correction plate into one end of the tooling bottom plate, and check whether the center line of the workbench, the valve body positioning ring 2, and the valve plate positioning ring 3 are vertical. Whether the direction of the head and the tail is misplaced, judge whether the centerline of the tail of the valve body coincides with the centerline of the spindle boring. The deviation can produce the required eccentricity, and there is no need to repeatedly find out if it is successful once.

Claims (3)

1. for the accurately quick boring technological equipment of double eccentric butterfly valve, it comprises workbench (9), valve body centring ring (2), valve plate centring ring (3) and tool base plate (7), it is characterized in that it also comprises the locating core for centering workpiece centre, described locating core comprises the lug boss (6) on matrix (5) and matrix top, described workbench is provided with centre bore, in described centre bore, interference fit has the matrix of locating core, the lug boss of described locating core stretches in tool base plate by the bottom plate hole (4) at described tool base plate center, and the diameter of described bottom plate hole is slightly larger than the diameter of the lug boss of locating core.

2., as claimed in claim 1 for the accurately quick boring technological equipment of double eccentric butterfly valve, it is characterized in that one end of described tool base plate is detachable and be connected with correcting plate (1).

3. as claimed in claim 1 for the accurately boring technological equipment fast of double eccentric butterfly valve, the cross sectional shape that it is characterized in that described valve body centring ring and valve plate centring ring respectively with valve body to be processed and valve plate suitable.