Method and device for vulcanizing inner mold and outer mold of tire through direct voltage electromagnetic heating

Abstract

The invention provides a method and a device for vulcanizing an inner mold and an outer mold of a tire through direct voltage electromagnetic heating. The vulcanization device consists of an assembly drum structure, an electromagnetic heating device and a tire outer mold. A vulcanization capsule on the conventional shaper vulcanizer central mechanism is replaced by the assembly drum structure of the tire, and the original vulcanization heating mode is replaced by an electromagnetic heating mode through an electromagnetic induction principle; in the vulcanizing process, an alternating magnetic field is generated by an electromagnetic coil under the action of high-frequency alternating current, and a drum tile of an assembly drum generates eddy current through the surface of a magnetic force line in a cutting magnetic field; due to the heat effect of the eddy current, the temperature of the drum tile is quickly increased to heat the tire, and the drum tile is matched with the outer mold to apply direct-voltage type vulcanization pressure onto a tire blank together; in the vulcanization heating process, temperatures of all parts of the tire are uniformly increased, temperature differences cannot be generated on the lateral parts of an upper tire and a lower tire, and steam and other heat transfer media are not required to be introduced at the vulcanizing stage; and the method and the device are high in electromagnetic heating efficiency and heating speed, the vulcanizing time of the tire can be greatly shortened, and the production efficiency of products can be improved.

Description

technical field [0001] The invention belongs to the technical field of tire vulcanization, and in particular relates to a tire inner and outer mold direct pressure electromagnetic heating vulcanization method and equipment. Background technique [0002] Tire vulcanization is the last process in the tire production process, which determines the quality of the final tire product. The equipment commonly used in the tire vulcanization process is a tire shaping vulcanizer, which is composed of a frame, a steam chamber, a central mechanism, a lifting mechanism and a thermal pipeline. Compared with the early tire vulcanizers, the biggest improvement of the existing tire sizing vulcanizers is that the vulcanization bladder replaces the water tire. During the vulcanization process, high-temperature steam / superheated water is injected into the bladder to provide the heat required for vulcanization of the tire. And the pressure, while the lifting and expansion of the bladder is contro...

AI Technical Summary

Problems solved by technology

However, there are still some disadvantages in the existing bladder vulcanization form, such as: 1. During the tire molding process, the mass distribution at each point of the green tire will be uneven due to factors such as processing accuracy. It cannot be solved because the pressure of the vulcanizing bladder on the tire is provided by circulating steam or superheated water during the vulcanization stage. The pressure provided by this form of pressure is low and unstable, so that the tire compound is in a molten state. Uniform distribution cannot be achieved even under the same conditions, and sometimes the vulcanizing bladder cannot be fully stretched during the inflation setting process, which will intensify this phenomenon. The uneven distribution of tire mass will cause common dynamic imbalance in the finished tire, which seriously affects the product qualification rate.

2. The high temperature steam injected into the bladder during vulcanization will produce condensed water and deposit on the bottom of the bladder. During the vulcanization process, the heat transfer will be uneven, and the temperature difference between the upper and lower sidewalls will cause the tire to have vulcanization quality problems such as oversulfurization or undersulfurization.

3. In addition, only a small part of the steam required in the vulcanization stage is actually absorbed by the tire, and most of it is consumed in the ineffective pipeline circulation, vacuuming of the bladder and water treatment process. The phenomenon of energy waste is serious. Although it has developed in recent years Energy-saving vulcanization technologies such as "pressure holding and cooling", but this cannot fundamentally solve the problem of heat dissipation of steam in pipeline circulation

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