JPH0633821B2 - Method and apparatus for assembling butterfly valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is applicable to fresh water, seawater, industrial water, muddy water, oil, chemicals, gas, powder, etc. by mounting an elastic seat ring on the inner surface of a valve body. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an applicable butterfly valve, and more particularly to an assembling method and an assembling apparatus for mounting the seat ring on the inner surface of a valve body.

(Prior Art) Conventionally, an elastic seat ring mounted on the inner surface of a valve body of a butterfly valve of this type has a brim-shaped ear portion formed by bending both end surfaces in a U-shaped cross section. Is configured to be elastically adhered to the seat ring grooves formed on both end surfaces of the opening of the valve body.

However, since the outer diameter of the ear portion of the above-described conventional seat ring is larger than the inner diameter of the opening surface of the valve body, the work of mounting the seat ring on the inner surface of the valve body has been performed as follows.

That is, as shown in FIG. 16, on the inner surface 1a of the valve body 1,
The elastic seat ring 2 is bent inward to reduce the outer diameter, and one valve rod hole 3a of the seat ring is inserted so as to coincide with the valve rod hole of the valve body 1, and then the other valve rod hole 3b is inserted. The seat ring 2 that is bent inward as described above and has a reduced outer diameter so as to correspond to the other valve stem hole of the valve body 1 and is provided in the vicinity of the already fitted one of the valve stem holes 3a. The ears 2a on both sides are gradually fitted into the seat ring groove 1b of the valve body 1 so that the seat ring 2 is extended and attached to the inner surface 1a of the valve body 1.

(Problems to be Solved by the Invention) All the above-described conventional work for mounting the seat ring on the inner surface of the valve body is performed manually.

The manual work begins with the work of forcibly bending the seat ring inward against the elastic force of the seat ring, and aligns one valve rod hole of the seat ring with the valve rod hole of the valve body. The work of gradually extending the seat ring while fitting it into the seat ring groove of the valve body
Not only is it force-consuming, but the valve stem hole is easily displaced, it is very difficult to correct it after mounting, skill is required, and all work is manual, so work efficiency is poor. There was a problem.

An object of the present invention is to perform the work of fitting the seat ring on the inner surface of the valve body of the butterfly valve rationally by mechanical force in place of the conventional manual work to raise the work efficiency.

(Means for Solving Problems) In order to solve the problems and technical problems of the above-mentioned conventional techniques, the assembling method of the present invention is as shown in the action explanatory diagrams of FIGS. 15 (a) and 15 (b). In addition, the seat ring 2 that is deformed by pressing the opening surface of the valve body 1, that is, both end surfaces of the valve body inner surface 1a in advance into an elliptical shape is placed in the valve rod hole of the valve body in the direction of the valve full opening direction. And the valve stem hole 3 of the seat ring are inserted so as to be aligned with each other, and while maintaining the matching state of the valve stem holes, both ends of the deformed seat ring 2 at diagonal positions in the longitudinal direction. 2a and 2y are symmetrically twisted in the same rotational directions a and a (clockwise in the figure), and in this twisted state, the seat ring 2 is centered around the valve rod hole. The seat ring ears 2a are swung in the same twisting directions a and b as the same rotational directions b and b (clockwise in the figure). It is characterized in that the seat ring is mounted on the inner surface 1a of the valve body by utilizing the repulsive elastic force of the seat ring while being forcedly fitted into the valve body seat ring groove 1b, and the above method is carried out. The assembling apparatus includes a pedestal for mounting the valve body at a predetermined position, and a valve rod hole of the valve body and a valve rod hole of the seat ring in the opening direction of the valve body attached to the pedestal in the direction of the valve fully opening direction. A pair of positioning pins that pass through each valve rod hole of the seat ring that is deformed into an elliptical shape and are inserted in advance so as to match each other and both ends of the seat ring in the long axis direction are rotated by the same rotation. A pair of twisting claws that are symmetrically twisted in the same direction, and a pair of rotating pushers that rotate the seat ring twisted by the twisting claws from a symmetrical position in the same rotation direction as the above twisting direction about the valve rod hole. And a pair of the above By using the rotating pusher, the ear portion of the seat ring in a twisted and twisted state is successively inserted into the seat ring groove of the valve body while being forcedly fitted to the inner surface of the valve body by utilizing the repulsive elastic force of the seat ring. It is characterized in that the seat ring is attached.

In addition, in the implementation, the twisting claw and the rotating pusher are
In either case, it is desirable to operate by a pneumatic or hydraulic cylinder and a link mechanism.

(Operation) The operation of the assembling apparatus of the present invention, that is, the operation (procedure) for attaching the seat ring to the inner surface of the valve body by the assembling apparatus is as follows.

(i) First, after mounting the valve body at a predetermined position of the pedestal, (ii) lengthening the seat ring in a state where the opening of the seat ring is orthogonal to the opening surface of the valve body, that is, in the direction of the valve fully opening direction. It is pressed and deformed into an elliptical shape, and is inserted so that both valve stem holes of the valve body and the seat ring are aligned, that is, the valve stem axes are aligned with each other, and a pair of positioning pins are inserted into each valve stem hole from the front and back. Are inserted and aligned, and the matching state is maintained.

(iii) Next, the two twisting pawls are symmetrically rotated in the same direction while engaging the claw portions of the twisting pawls at both end portions of the seat ring deformed into the elliptical shape in the diagonal direction in the longitudinal direction as described above. The seat ring, the seat ring is symmetrically deformed while twisting both ends of the seat ring in the same rotation direction.

(iv) Since the seat ring deformed as described above remains deformed, the twisted state remains,
A pair of rotating pushers are used to rotate in the same rotational direction as the above-mentioned twisting direction until a final angle of 90 ° is reached. For the valve diameter where the deformation is difficult to maintain, the tip of the deforming convex portion may be lightly supported by an auxiliary support tool.

(v) As the turning progresses and approaches 90 °, the ear portion of the seat ring comes into contact with the seat ring groove of the valve body and is forcedly pushed into the seat ring groove, and at the same time, the reaction force of the seat ring The deformed state begins to collapse, and the repulsive elastic force of the elastic material (rubber) causes a movement to return to the original shape.

Since it is difficult to maintain the deformed state of the seat ring, even if the tip of the deformed convex portion is lightly supported by the auxiliary support as described above, if the auxiliary support is removed at this point, the restoration starts similarly. .

Here, the pressing external force of the rotating pusher is appropriately removed, the movement of returning to the original shape by the repulsive force is promoted, and the operation of pressing again by the rotating pusher is repeated several times.

(vi) In this way, the seat ring is completely restored to its original shape by a few movements of the rotary pusher and is evenly attached to the inner surface of the valve body.

After mounting as described above, remove the valve body from the pedestal.

(Example) Next, the Example of this invention is described with drawing.

FIG. 1 is an overall perspective view of a butterfly valve assembling apparatus showing an embodiment of the present invention, and FIG. 2 is a mechanical view of essential parts.

In FIG. 1, a pedestal 11 configured to support the valve body 1 at three points, that is, the left and right lower end surfaces and the upper end portion, is fixed to the support pedestal 10, and the valve body 1 supported by the pedestal 11 A main valve rod side positioning pin 12 and a sub valve rod side positioning pin 13 each having a tapered portion at the tip thereof are provided so as to face the two valve rod holes, respectively, and the main valve rod side positioning pin 12 is provided.
Is connected to the rod (piston rod) of a cylinder (pneumatic cylinder) B mounted above the end surface of the support base 10, and the auxiliary valve rod side positioning pin 13 is mounted on the moving base E fixed to the upper portion of the cylinder A. It is fixed to a fixed plate 22 that is integrally provided in the.

On the other hand, at the upper and lower positions of the pedestal 11, the claw portion 14 that engages with the ear portion of the seat ring and twists the seat ring.
A pair of seat ring torsion claws 14 and 15 having a and 15a are provided to face each other, and the torsion claw 14 is attached to a rotating shaft 14b supported at a predetermined position, and the rotating shaft 14b is
Through the arm 14c, the connecting rod 14d and the arm 14e, the torsion claw 1
5 is connected to the rotating shaft 15b. And the rotating shaft 15b
Is connected to the rod of cylinder C via arm 15c.

On the other hand, as shown in FIG. 2, a pair of rotating pushers 16 and 17 are provided adjacent to the pair of twisting claws 14 and 15, and both rotating pushers 16 and 17 are provided with arms 16a and 17a, respectively. Via the positioning pin 13 is connected to the pivot shafts 16b and 17b that are symmetrically provided diagonally up and down, and the pinions 18 and 19 are attached to the pivot shafts 16b and 17b, respectively. There is. The two pinions 18 and 19 are engaged with a rack 20 attached to the rod of the cylinder D so as to rotate 90 °, and the rack 20 is guided by a guide 21 to reciprocate. It has become. Then, the twisted claw 1
4, 15 rotating shafts 14b, 15b rotating direction (clockwise),
The turning directions of the turning shafts 16b and 17b of the rotary pushers 16 and 17 (clockwise around the pin 13) are set to the same rotation direction (clockwise).

Everything except the cylinder B and the pedestal 11, that is, the torsion claws 14, 15, the rotating bushings 16, 17 and the cylinders C and D attached thereto are fixed on a moving base E that slides with the cylinder A. Thus, one slide unit F is constructed. The rods A ₁ and A ₂ protruding on both sides of the cylinder A are cylinder fixing plates on the support base 10.
It is fixed to 23a and 23b, and the cylinder A itself moves on the support 10.

Next, the operation of mounting the seat ring on the inner surface of the valve body using the above-described assembling apparatus, that is, the operation of the assembling apparatus will be described according to the procedure of the operation.

FIG. 3 shows the torsion claws 14 and 15 and the rotating pushers 16 and 17.
FIG. 15 is a state explanatory view showing the relationship between each movement of the seat ring 2 and the seat ring 2, and FIGS. 4 to 14 are explanatory views showing an operation mode which changes according to the procedure of the assembly work, and FIG. [Fig. 3] is an operation explanation view schematically showing the assembling method of the present invention.

(i) First, the valve body 1 is attached to the pedestal 11 so as to support the lower end portions on both sides and the head portion at three points. (First, third, fourth
(Ii) The seat ring 2 which has elasticity in a state where the opening of the seat ring is orthogonal to the opening surface of the valve body, that is, both end surfaces of the inner surface 1a of the valve body, that is, the seat ring 2 which has elasticity in a fully opened state, resists elasticity in an oblong shape. It is pressed and deformed, and is inserted into the valve body 1 so as to roughly match the shaft center. (Figs. 1, 3, 5 (a) and (b)) (iii) When the main body of the cylinder A is moved forward, the slide unit F attached to the upper part of the main body moves forward, and the positioning pin provided on the front part thereof. The tapered portion at the tip of 13 serves as a guide, and as shown in FIG. 6, one valve rod hole 3 of the seat ring 2 is aligned with the valve rod hole of the valve body. Then, when the rod of the cylinder B is extended, the other valve rod hole is also aligned with the valve body 1 by using the tapered portion of the tip of the positioning pin 12 as a guide. (FIGS. 1 and 6 (a) and (b)) In this state, the upper and lower torsion claws 15 and 16 are
It is located above and below the opening surface of.

(iv) When the rod of the cylinder C is pulled in, the lower twisting claw 15 rotates clockwise about the fulcrum 15b to the two-dot chain line position 15 'in FIG. 3, and at the same time, by the link mechanisms 14e, 14d, 14c. The upper twisting claw 14 is also centered on the fulcrum 14b and the position of the two-dot chain line 1
Rotate to 4'in the same direction. By this action, each twisting claw 1
Since the claw portions 14a and 15a of the seat rings 4 and 15 are pushed into the far side of the seat ring 2 (the direction in which the diameter is reduced), the seat ring is twisted symmetrically in the longitudinal direction in FIG. To the position 2'shown by the two-dot chain line. When the rod of the cylinder C is extended after this deformation is sufficiently performed, the upper and lower torsion claws 14 and 15 rotate in the opposite direction (counterclockwise),
Although it returns to the original state shown by the solid line in FIG. 3, the torsional deformation of the seat ring remains to be maintained at almost all diameters.
In addition, in the case where the deformation is difficult to maintain, the tip of the deformed convex portion is lightly supported by an auxiliary support (G in FIG. 7).
(FIGS. 7 (a) and (b)) (v) Next, when the rod of the cylinder D is extended, the rotation of the pinions 18 and 19 meshing with the rack 20 on the rod side causes the arms 16a and 17a to move. Upper and lower rotating pusher 16
And 17 start to turn in the same direction (clockwise) as the above-mentioned twisting direction around the shafts 16b and 17b, and the seat ring 2 is kept in the deformed state and the positioning pins 12 and 13 are used as fulcrums to make the final position. Start turning until it reaches 90 °. (Fig. 8
(a) (b) to Fig. 10 (a) (b)) (vi) As the turning progresses and approaches 90 °, the rotary pusher 16,
17 are positions 16 'and 1 indicated by the two-dot chain line in FIG. 3, respectively.
7 ′, which moves the seat ring 2 to the position of the chain double-dashed line 2 ″.
The ear portion 2a of the valve comes into contact with the seat ring groove 1b of the valve body and is forcibly pushed into the seat ring groove 1b, and at the same time, its reaction force (acts in the returning direction of FIG. 11 (a)). At this point, the deformed state of the seat ring begins to collapse, and due to the impact resilience of the elastic material (rubber), a movement to return to the original shape occurs.

Since it is difficult to maintain the deformed state of the seat ring, even if the tip of the deformed convex portion is lightly supported by the auxiliary support as described above, if the auxiliary support is removed at this point, the recovery starts similarly. . (Fig. 11 (a) (b)) (vii) Here, once pull the rod of the cylinder D, rotate the rotating pushers 16 and 17 in the opposite direction, remove the external force to the seat ring, and restore the original shape by the repulsive force. The movements of accelerating the movement of the rotating pushers 16 and 17 are rotated again in the original direction and then returned to the opposite direction, which is repeated several times.
(FIGS. 12 (a) and (b)) (viii) The seat ring 2 is completely returned to its original shape by several movements of the rotary pushers 16 and 17, and is evenly attached to the inner surface of the valve body 1. (Figs. 13 (a) and (b)) (ix) The main body of the cylinder A is retracted, the slide unit F is retracted, and then the rod of the cylinder B is retracted. Pull out from the stem hole of the main body. (Fig. 14) This completes the assembly work.

In the above-described embodiments, the structure in which the twisting pawl and the rotating pusher are operated by the cylinder and the link mechanism has been described, but it goes without saying that these mechanisms can be modified in various ways.

In addition, in the above-described embodiment, the description is given of the one having the ring-shaped protruding portion inside the ear portion of the seat ring.
The same can be applied to the seat ring having no protruding portion as described above.

(Effects of the Invention) As described above, according to the present invention, the elastic seat ring is deformed into the oblong shape in the direction of the valve fully opening direction and inserted into the opening surface of the valve main body, and the valve stem of the valve main body and the seat ring is inserted. With the positioning pin inserted in the hole, both ends in the long axis direction are symmetrically twisted in the same rotation direction, and in this twisted state, they are swung in the same rotation direction as the twisting direction, and the seat ring ears are sequentially rotated. While forcing it into the valve body seat ring groove,
By mounting the seat ring on the inner surface of the valve body by utilizing the repulsive elastic force of the seat ring, the work of mounting the seat ring on the inner surface of the valve body of the butterfly valve, which has been conventionally performed manually, can be performed. All can be done by mechanical force with a relatively simple assembly device. In addition, prior to mounting, twisting and turning are performed with the positioning pin inserted and fixed in both valve rod holes of the seat ring, so there is no deviation between the valve body and both valve rod holes of the seat ring.
There is also an advantage that hole alignment is unnecessary after the seat ring is attached.

Therefore, the skill level conventionally required for the work of mounting the seat ring is completely unnecessary, and the work efficiency can be further improved.

Furthermore, when automating the manufacturing process of the butterfly valve, the assembly process of the valve body and the seat ring, which has heretofore been impossible to do by hand, can be performed by the automatic assembly device by adopting the present invention. So
It is possible to achieve complete automation.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a butterfly valve assembling apparatus showing an embodiment of the present invention, FIG. 2 is a mechanical view of essential parts, FIG. 3 is a state explanatory view, FIG. 4 and FIG. 5 (a). (b) to Figure 13 (a)
(b) and FIG. 14 are operation explanatory views showing a mode that changes according to the procedure of the assembly work, and FIGS. 15 (a) and (b) are operation explanatory views schematically showing the assembly method of the present invention. FIG. 16 is an explanatory view showing a conventional butterfly valve assembling method. 1 ... Valve body, 1a ... Valve body inner surface, 1b ... Seat ring groove, 2 ... Seat ring, 2a ... Ear, 3 ... Valve hole, 11 ... Bed, 12,13 ... Positioning pin, 1
4,15 ... Twisting claw, 16,17 ... Rotating pusher, A,
B, C, D ... Cylinder.

Claims (3)

[Claims] 1. An elastic seat ring, which has been deformed by pressing it into an elliptical shape in advance on the opening surface of the valve body, and the valve rod hole of the valve body is aligned with the valve rod hole of the seat ring in the direction of the valve full opening direction. Insert while doing so, while maintaining the matching state of each valve hole,
Then, both ends of the deformed seat ring at diagonal positions in the long axis direction are symmetrically twisted in the same rotational direction,
In this twisted state, the seat ring is swung in the same rotation direction as the above twisting direction about the valve rod hole,
A butterfly valve, characterized in that the seat ring ears are successively forcibly fitted into the seat ring groove of the valve body, and the seat ring is mounted on the inner surface of the valve body by utilizing the repulsive elastic force of the seat ring. Assembly method. 2. A pedestal for mounting the valve main body at a predetermined position, and a valve stem hole of the valve main body and a valve stem hole of the seat ring in the opening direction of the valve main body attached to the cradle in the direction of the valve full opening. 1 to pass through each valve rod hole of the elastic seat ring that has been deformed into an elliptical shape in advance so as to be aligned with each other
A pair of positioning pins, a pair of twisting claws that symmetrically twist both ends of the seat ring in the long axis direction in the same rotational direction, and a seat ring twisted by these twisting claws around a valve rod hole. And a pair of rotating pushers for rotating the symmetric position in the same rotation direction as the twisting direction.
By using the pair of rotating pushers, the ears of the seat ring in a twisted and twisted state are sequentially forcedly fitted into the seat ring groove of the valve body while utilizing the repulsive elastic force of the seat ring. An apparatus for assembling a butterfly valve, wherein the seat ring is mounted on the inner surface. 3. A butterfly valve assembling apparatus according to claim 2, wherein both the twist claw and the rotary pusher are operated by a cylinder and a link mechanism.