CN1011210B - Production equipment and method of type b capsule - Google Patents

Abstract

The present invention relates to a device and a method for manufacturing type B capsules of a tire forming vulcanizer machine. The device comprises an upper outer mould, a lower outer mould and a core mould, wherein the core mould is integration, and a compressed air pipe in the core mould is connected to the bottom of the lower outer mould; the lower outer mould has a base, and a non-perforated discharge hole for air is drilled on the bottom; the sizing material is arranged on the bottom of the lower outer mould. Under the action of pressure and temperature, the sizing material flowing upward in single direction is filled in a mould cavity when the core mould and the outer mould are joined. After vulcanization, a capsule is separated from the core mould when compressed air is guided to the bottom of the core mould. Then the capsule is taken out, and the pieces of sizing material formed on the bottom are clipped. When type B capsules are produced by the device and the method, layer separation in a center joint and sizing shortage at a lower mould port are avoided, and the faults of crack of capsule ports, air bubbles, etc. are avoided, thereby enhancing the quality of capsules and decreasing the discarding rate.

Description

Production equipment and method of type B capsule

The present invention relates to the manufacturing installation and the production method of the Type B capsule in the tire forming vulcanizer.

In the past, people use bladder vulcanizing machine to produce the Type B capsule usually, and bladder vulcanizing machine is a forcing press of pressurization from bottom to top, and the bladder curing model is contained between entablature and the workbench.When producing capsule, earlier annular sizing material is placed in the sizing material groove of counterdie, plunger is risen, following core meets with last core and up moves, core oil cylinder down pressurization simultaneously on this moment, and core compresses up and down.When plunger continued to rise to whole pressing, then sizing material was full of whole die cavitys and begins sulfuration.After the Type B bladder curing finishes, at this moment plunger decline die sinking is gone up core and is pushed core decline, and last core and capsule break away from patrix together.Between capsule and last core, feed compressed air from the compressed air hose of last core, capsule and last core are thrown off.Last core rises and capsule breaks away from, and after plunger dropped to the lower position, following core rose, and capsule is released from counterdie.The Type B capsule is a kind of dolioform tubbiness rubber bag tank of upper and lower opening, its lower end is installed on the following chuck of vulcanizer central authority, the upper end is installed on the chuck on cylinder piston rod top of the stretching capsule of central authority, in operating process capsule be exposed to all the time counterdie above, capsule is deviate from from tire to peel off mode when going out tire, so capsule in use will stand to subdue in hot environment repeatedly.But the quality of the Type B capsule of being produced with legacy equipment, method usually causes fluctuating widely of Type B capsule qualification rate because of the variation of raw material lot number, sizing material processing technology.This moment, product very easily produced defect such as capsule schistostoma, bubble, centre joint delamination, following die orifice starved, thereby percent defective is higher.Even when vulcanizing cover tire, split or the Nang Kou cracking because of the capsule delamination in use that has with Type B capsule qualified in criticizing, cause service life low, also can make the cover tire that is vulcanizing become waster.

For this reason, people are actively seeking improved method for a long time, as the edge knuckle line of having taked upper and lower mould joint close face change into circular arc, external mold inwall begin to rehearse pore, steel the heart add exhaust line, sizing material adopts whole piece to extrude, strengthen the measures such as quality control of rubber mixing technique, though can improve the qualification rate of capsule sometimes, all fail fundamentally to solve quality problems.

The purpose of this invention is to provide a kind of apparatus and method of making the Type B capsule, it can be not influence product percent of pass because of the variation of raw material lot number, sizing material processing technology.

The present inventor is according to the practical experience of long-term production Type B capsule and in conjunction with the characteristics of capsule sizing material tack difference, through theoretic qualitative analysis and repetition test, reaches then and causes the present invention.

The present invention is improvements over the prior art, and concrete design is that two sections cores with original device make to be holistic core into, and following external mold has the end, and inner bottom part has the transpiration hole of not wearing the end.Core compressed air pipe is switched to the core bottom.Method of the present invention be with the Type B capsule in molding sulfuration matched moulds process, the two-way flow that becomes sizing material is one-way flow, help the exhaust of sizing material, fundamentally reduce the swirl shape streamline of bubble, centre joint delamination, counterdie and capsule oral area etc., to improve the qualification rate and the quality of product.

Advantage of the present invention is that the sizing material in the production method is shaped as kob typ or clot, can avoid the capsule schistostoma that causes because of the sizing material joint because the core in this device is an integral body.Simultaneously, cooperate sizing material to be placed on the external mold bottom, sizing material also becomes one-way flow by two-way flow before sulfidization molding, one-way flow has overcome thoroughly that sizing material fills up epicoele earlier in the two-way flow, the a series of problems that blow back into cavity of resorption then and produced, thus centre joint delamination, the sizing material that fundamentally can eliminate capsule flow in the swirl shape streamline of counterdie and capsule oral area.Because of the sizing material one-way flow helps exhaust, the possibility of easily undischarged air being clamp-oned again sizing material when going up die orifice is sealed in the sizing material refluence that can eliminate in the conventional method again.Therefore use apparatus and method of the present invention, can improve the qualification rate of capsule.Reduction also can be removed the extrusion technique that cooperates sizing material to the performance demands of sizing material, reaches to save electricity consumption, minimizing equipment, minimizing place etc., has also cancelled the heavy work of at high temperature capsule being deviate from from following core by the operator in the original production method.

Fig. 1 is a structural representation of the present invention.

Fig. 2 is embodiments of the invention.

As shown in Figure 1, the present invention includes external mold (1), following external mold (7) and core (3).Steam pipe (4), return tube (6) and compressed air hose (5) are arranged in the core.Form die cavity (2) between core and the external mold.Distance between core bottom and the following external mold is 2-5mm.The capsule manufacture process as shown in Figure 2, sizing material (8) is made kob typ, clot or bulk place down the external mold bottom, following external mold rising (Fig. 2 .a), core also rises, until external mold and last external mold close up the formation die cavity fully down, under the pressure and temperature effect, the bottom sizing material is one-way flow from bottom to top, is full of whole die cavity (Fig. 2 .b).After sulfuration finished, core was synchronized with the movement downwards with following external mold, and capsule and last external mold are thrown off (Fig. 2 .c).When core drops to extreme lower position.Following external mold is down motion separately, and its dropping distance preferably is no more than 10mm, in order to avoid break in the capsule bottom.Then blow to the capsule inner bottom part by core compressed air pipe, blow gas pressure is 9.8 * 10 ⁴About Pa (Fig. 2 d).Capsule still is close to down external mold under gas pressure, and at this moment, core up moves, till core and capsule break away from fully (Fig. 2 .e).Take out capsule.With the capsule bottom thickness is that rubber and the commissural rubber that overflows of upper and lower mould of 2-5mm is repaiied.

Claims (2)

1, a kind of manufacturing installation of tire forming vulcanizer Type B capsule, by up and down two external molds and core are formed, steam pipe, return tube and compressed air hose are housed in the core, it is characterized in that core is as a whole, core compressed air pipe is switched to the core bottom, following external mold has the end, and the bottom has the transpiration hole of not punching.

2, the manufacturing installation of Type B capsule as claimed in claim 1, when it is characterized in that forming die cavity, the distance between core bottom and the following external mold is 2～5mm.

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