JPS58108124A - Lining method for valve body rubber of soft seal valve - Google Patents

Abstract

PURPOSE:To complete vulcanization simultaneously for lining and covering by a method wherein a shaft metal fitting and a blank piece are inserted into the shaft hole of a valve body and the side hole thereof respectively, unvulcanized rubber for lining is filled up in gaps from the inner surfaces of the holes, the shaft metal fitting and the blank piece are removed thereafter, an inner piece and a blank piece for actual vulcanization are inserted instead, and rubber for covering is pressed in. CONSTITUTION:A shaft metal fitting 4 and a blank piece 5 are inserted into a shaft hole 2 and a side hole 3 respectively with prescribed gaps for lining rubber from the inner surfaces thereof. Unvulcanized rubber heated to 70-80 deg.C is filled up in the gaps from an extruder 6. After completion of this operation, a valve body 1 is removed from the extruder 6, the shaft metal fitting 4 and the blank piece 5 are drawn off from the valve body 1 whereto lining rubber R1 is connected, and an inner piece 18 and a blank piece 19 for actual vulcanization are inserted instead and made to stick fast to the lining rubber R1. A metal mold 20 has two dies M1 and M2 wherein cavities corresponding to a desired outer shape of the valve body are formed, and the valve body 1 is supported in suspension in the cavities with a gap from the surfaces of the dies. Covering rubber R2 is injected from a rubber pot 21, the actual vulcanization is performed at the temperature of 155-185 deg.C, and simultaneously the actual vulcanization of the lining rubber R1 is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for rubber lining a valve body of a soft seal valve.

Recently, there has been a tendency for soft seal valves to be used more frequently.
Rubber liner on the inner peripheral surface of the shaft hole and side hole formed in the valve body, and on the outer peripheral surface of the valve body! It is difficult and problematic to do so, and when lining the outer surface of the valve body, a support pin is used to form a gap within the valve body, so when the valve body is removed, the support pin becomes a hole. - There is a disadvantage that not only does it have to be fixed, but also that this part is easily damaged during use later.

The present invention was made to solve the above-mentioned problems, and the shaft hole of a valve body having a shaft hole and a side hole communicating with the opening is provided with a shaft metal fitting, and the side hole is provided with a blind piece T, which is attached to the inner surface of the hole. This gap is communicated with an extruder, and unvulcanized rubber humidified to 70 to 80C is filled into the gap with the extruder, and after this filling is completed, the valve is inserted. Remove the weir from the body extruder, remove the shaft fitting and blind piece, and replace them with the core and blind piece for main vulcanization. Next, support the above-mentioned core inside the metal by both ends to maintain a gap for the outer lining between the two ends of the core, and fill this gap with rubber from the rubber pot at 155 to 18 mm.
This relates to a method for rubber-tightening a valve body of a soft seal valve, which involves press-fitting and vulcanizing at a temperature of around 5C, and also completing vulcanization of the rubber tubes in the shaft hole and side holes.

Hereinafter, an example of the implementation of the present invention will be described with reference to the drawings. The valve body l is made of metal and has a predetermined external shape, penetrates from the upper end to the lower end, communicates orthogonally with the specific axis hole 2 and the opening, and side holes 3 open to both sides.
A narrowed part 2al is provided at the lower end of the shaft hole 2, and the inner peripheral surfaces of the shaft hole 2, the narrowed part 2a, and the side hole 3 are covered with unvulcanized rubber in the inner lining process described later, and then the valve body is formed. Rubber emulsion is applied to the outer surface in the outer surface lining step described later, and vulcanization is completed.

(1) Inner surface fitting First, the shaft hole 8 of the valve body l has the shaft metal fitting 4, and the side hole 3 has the blind piece s.
T-Insert・The shaft fitting number is round bar-shaped and has a narrowed part 2&
The small bottle end vIB4& is formed to protrude further, and the upper part is made to protrude by one point from the upper end of the shaft hole 2. The blind piece 5 has a main body inserted into the side hole 3 and a protrusion 5 that contacts and closes the outer periphery of the side hole 3.
at-true. The dimensions of the shaft fitting 4 and the blind piece S are such that a predetermined lining month l is formed between them and the inner surfaces of the shaft hole 2 and side hole 3.
! ◎To inject rubber into this lining gap, connect it to the extruder 6.

The extruder 6 has a built-in screw and a constriction mouthpiece 7 at the extrusion port.
7 langes 6&a'l& and bolts 8&, nuts) 8b), and attach the injection port 9t port) 1 to the end of the constriction cap 70.
0, and inside the inlet fitting 9, an inverted bowl-shaped support 12 that supports and maintains the top of the shaft fitting 4 is fixed by a plurality of arms 12, and below it is a centering bottle 11t - from the outside to the center. set up towards Further, the lower part of the injection port fitting 9 is formed into a narrowed part 9& having a slightly larger diameter than the shaft fitting 4, and the upper end l& of the valve body l is fitted into the lower end of the narrowed part 9&, and a flange 9b[ The setting is - Also, 7 langes 9ct are provided on the outer periphery above the narrowed part 9&, and a fixing device lat>tunji
1L and bolt 15. P can be attached and detached with Nut X6,
There is a blind piece at the bottom of the fixture 14! An inward 7 flange 14bV that engages with the SO protrusion 1s1$& is provided so that the protrusion Sa of the blind piece and the t port t17 are tightened.

To perform the inner lining, as shown in FIG. 1, insert the narrowed part 91LK from the lower end of the upper mt inlet fitting 9 of the shaft fitting 4, fit the upper end of the shaft fitting 4 to the support 11, and insert the centering bottle. The center pipe is determined by 13, and the valve body is inserted from the lower end of the shaft fitting 4 into the lower end of the valve body upper end 11LI, and the small diameter portion 4a of the lower end of the ring fitting A4O is fitted into the lower end of the injection port fitting 9. It is made to protrude from the narrowed part 2 & at the lower end of the valve body l. Next, the blind piece 5 [fits into the side hole 3 and the fixture 1 that surrounds these pieces]
4 from below to the flange 9c with the 7 langes 141, bolts 15, and nuts 16], and the lower end 7 twists 14b.
Tighten the bolts 17t and attach the P valve body L, shaft fitting 4, and blind piece! Fix S.

In this way, a predetermined lining gap is formed between the inner surfaces of the shaft hole 2 and side hole 3 of the valve body l and the shaft fitting 4 and the blind piece S, and the narrowing W59 & of the shaft fitting 4 and the injection port fitting 9 is formed. Since nine injection gaps are formed in between that communicate with the lining gap, the unvulcanized rubber extruded by the extruder 6 can be injected into the twinning gap.The temperature of this unvulcanized rubber is 70 to 80C. Inside and outside, the extrusion pressure is 5-6 Kt/d. The limit of this injection amount is the narrowed part 2 at the lower end of the shaft hole of the valve body l.
& and the small diameter portion 41L of the lower end of the shaft fitting until the injected rubber flows out. After the injection is completed, the valve body 1 is transferred to the extruder 6.
The outer surface lining process is carried out after removing it.

(2) External lining process The shaft fitting 4 and blind piece ST are removed from the valve body l, which has been bonded with unvulcanized lining rubber Rat to the shaft hole 2 and side hole 3 through the internal lining process, as shown in FIG. 4. Core 18 and blind piece 1G for actual vulcanization? Insert these T linings into close contact with each other, and insert both ends 18 &* 18 b of the core 18.
is made to protrude to engage the inner ISK of the gold gzo.The gold gzo consists of the lower 11M5 and the upper lid M3, both Ill Mt.
a M, pc A lid surface Ma=M& is provided so as to form a cavity corresponding to the desired external shape of the valve body, and at both ends thereof, engaging portions M,, M
The p-valve body 1 is actually supported in a hanging form by the core 18 provided and engaged here, with a required gap from the K11 surface in the cavity of the metal lid, and a rubber pot on the metal lid is inserted into this gap. The outer rubber bird is injected from 21 through the injection path 22.The temperature is 1! s5~1SSC inside and outside, pressure 80Ka/cd
Then, main vulcanization was carried out for 15 to 60 minutes.At the same time, the lining rubber B on the inner peripheral surface was cured.

The actual vulcanization is completed.

After completion of vulcanization, 11 commercially available products were obtained from the gold Witto as shown in FIGS. 5 and 6. The lining rubber and the 8 outer rubber linings are vulcanized and covered with the same rubber lining 8 both inside and outside.

As described above, the lining rubber R1 and the outer lining rubber are formed in separate processes, and the lining rubber R1 is unvulcanized. Since the vulcanization of the stretch rubber R1 is completed at the same time, this is simplified compared to performing the main vulcanization in the inner and outer processes.Also, when injecting the outer stretch rubber, the valve body is connected to both ends of the core protruding from both ends and the metal lid. Since it is supported in a suspended shape within the mold cavity by engagement with the inner engaging part, there is no need to insert a support pin between the outer surface of the valve body and the lid surface of the metal lid to support the outer surface of the metal lid. The support bottle is not trapped in the rubber injected into the gap for the rubber tweezing, and there is no need for the extra work of removing the support bottle from the outer rubber on the molding machine and digging the hole with the rubber. Not only that, but there is no problem such as the part being easily damaged in the future, so it has excellent performance.It has the advantage of being able to provide an excellent soft seal valve pipe at a low price.

[Brief explanation of drawings]

The drawings show an example of the implementation of the present invention, and Figure 5lAx is a longitudinal sectional front view of the state in which the lining rubber is injected, Figure 2, and Figure sI1.
gl is a sectional view of I-1 and I-1 in Fig. 1, Fig. 4 is a longitudinal sectional front view of the state in which the outer rubber is injected, IS is a front view of the product, and Fig. 6 is a side view. 1 is the valve body, 2 is the shaft hole', 3 is the side hole, 4 is the shaft fitting, S is the blind piece, ・ is the extruder, l$ is the core for main vulcanization, 111 is also the blind piece, 2G is a mold, 21 is a rubber pot, 22 is one entrance, R1 is inner rubber, RIFi outer rubber, and B is rubber lining. D1 Diagram Ka2 Diagram Mugi 4 Causes

Claims (1)

[Claims] 1. Insert a shaft fitting T into the shaft hole of a valve body having a side hole communicating with the shaft hole and a blind piece T into the hole, leaving a gap for lining between them and the inner surface of the hole. The extruder is connected to the extruder, and unvulcanized rubber heated to 70 to 80 C is filled into the same gap by the extruder. After the filling is completed, the valve body is removed from the extruder, and the shaft fitting and the top of the blind piece are removed. In place of these, a core and a blind piece for main vulcanization are inserted, the valve body is inserted into the metal plate, and both ends of the core protruding from both ends of the valve body are supported in the metal plate to form a mold surface. A gap for the outer lining is maintained between the rubber pot and the rubber t15.
5~185t? A method for lining a valve body rubber lining for a soft seal valve, characterized by press-fitting and vulcanizing at internal and external temperatures, and also completing vulcanization of the rubber in the shaft hole and side holes.