CN109572014A - A kind of low outer temperature vulcanization process of off-the-road tyre - Google Patents

Abstract

The present invention, which relates to, provides a kind of off-the-road tyre low outer temperature vulcanization process, keep warm sulfuration process in tire constant, the outer warm sulfuration process of adjustment, vaporium is passed through the low-pressure saturated steam that pressure is 0.20MPa-0.40MPa, temperature is 100 DEG C -110 DEG C i.e. to outside vulcanization, make to move to tire centerline outside tyre vulcanization most weakness position by outer temperature drop is low, it keeps the inside and outside portion's pressure medium of tire and temperature to stablize vulcanization to terminating, takes out tire, complete vulcanization.Its advantage: (1) external pressure vapor (steam) temperature in tire vulcanization process is reduced, a large amount of steam are saved, so that the energy consumption of tire vulcanization process is substantially reduced (2) reduces tire over cure degree, total cure degree can reduce by 20% or more, it improves tire and integrally vulcanizes uniformity, tire quality significantly improves, and the more traditional isothermal and isobaric sulfuration process of service life improves 6%-10%.

Description

A kind of low outer temperature vulcanization process of off-the-road tyre

Technical field

The present invention relates to tire manufacturing arts, and in particular to a kind of off-the-road tyre vulcanization process.

Background technique

Currently, off-the-road tyre isobaric isothermal vulcanization technique that manufacturing process is mostly used greatly using sulfuration process, i.e. sulphur Melt medium (such as saturated vapor) certain time that begins first to be passed through certain temperature and pressure in curing bag to tire into Then row presulfurization is passed through steam or superheated water in vaporium and capsule to outside tyre vulcanization, steam during tire optimum cure Vapour remains constant for recycling with superheated water temperature and pressure.In the sulfuration process vulcanization of interior temperature rely primarily on superheated water recycle into Row vulcanizes, and outer vaporium is passed through low-pressure steam and is vulcanized outside outer temperature vulcanization direction tyre vulcanization, and vapor (steam) temperature is substantially at 140 DEG C More than.

Since off-the-road tyre cross dimensions is larger, vulcanization time is longer, using the sulfuration process at the outer temperature temperature Tire is easily caused integrally to vulcanize unevenly in the practical sulfidation of engineering tire, tyre vulcanization most weak location is biased to tire In, illustrate that tire is uneven in sulfuration process vulcanization, there are outer temperature temperature drift phenomenon, and tyre stock over cure degree compared with Greatly, vulcanized rubber physical property is greatly reduced, and influences tire quality；Simultaneously because outer temperature vapor (steam) temperature is higher, production is increased Cost also increases energy waste.

Summary of the invention

For overcome the deficiencies in the prior art, the present invention provides a kind of New engineering machinery tire low outer temperature vulcanization process, To reduce off-the-road tyre over cure degree, tire quality is improved, while reducing the energy consumption in tire vulcanization process.

The low outer temperature sulfuration process of the off-the-road tyre that the present invention designs, refers on the basis of isobaric isothermal vulcanization technique, Keep warm sulfuration process in tire constant, the outer warm sulfuration process of adjustment, i.e., it is 0.20MPa- that vaporium, which is passed through pressure, to outside vulcanization 0.40MPa, the low-pressure saturated steam that temperature is 100 DEG C -110 DEG C, keep the inside and outside portion's pressure medium temperature of tire to stablize, are taking turns Sulfuration effect at tire vulcanization most weak location carries out row pressure, vacuumizes when being more than sulfuration effect needed for vulcanization substitute bubble point, Tire is taken out, vulcanization is completed.

Beneficial effects of the present invention: after outer temperature temperature is reduced to 100 DEG C -110 DEG C, tyre vulcanization most weak spot position is by taking turns It is outer inside tire to move to tire centerline, it influences tire centerline by inside and outside temperature more balanced, significantly improves tire and integrally vulcanize uniformly Property；Tire over cure effect significantly reduces, and state of cure (vulcanization) reduces by 20% or more, and service life can be improved 6% or more, tire quality It significantly improves；Overall cure time is increased slightly, and substantially reduces external pressure steam consumption in tire vulcanization process, has saved steaming Vapour makes the energy consumption of tire vulcanization process decrease.

Specific embodiment

Tire bury and covers each temperature measuring point temperature of thermocouple temperature measurement conducting wire timing monitoring inside tires, keeps mistake in capsule Hot water and outer steam chamber vapor (steam) temperature, pressure are stablized, and rise tire integrally persistently using superheated water heat and external pressure steam heat Temperature, guarantee the temperature maximum at tyre vulcanization most weak location between 100 DEG C -110 DEG C, and equivalent sulphur at this location When changing effect more than sulfuration effect needed for vulcanization substitute bubble point, opens water discharging valve row pressure, vacuumizes, take out tire, complete Tyre vulcanization.

Embodiment:

Certain scale engineering machinery tire, outer temperature is arranged 105 DEG C, when curing bag superheated water is recycled to about 270min, tire When temperature is about 110 DEG C at vulcanization most weak location, the sulfuration effect at the position is more than vulcanization needed for vulcanization substitute bubble point Effect empties inside and outside pressure at this time, takes out tire.

More traditional 143 DEG C of the total cure period outer warm sulfuration process extend 20min, and tyre vulcanization most weak location is by shoulder tire Outer inside base to move at shoulder tire primary surface (shoulder center), vulcanization uniformity significantly improves, and tire over cure effect significantly reduces, Total cure degree reduces by 20% or more, and 6%-10% can be improved in service life, and tire quality greatly improves.

Claims (1)

1. a kind of low outer temperature vulcanization process of off-the-road tyre, it is characterized in that: keeping in tire that warm sulfuration process is constant, reduce outer Vapor (steam) temperature is pressed, i.e., vaporium is passed through the low pressure that pressure is 0.20MPa-0.40MPa, temperature is 100 DEG C -110 DEG C to outside vulcanization Saturated vapor keeps the inside and outside portion's curing medium pressure and temp of tire to stablize, the sulfuration effect at tyre vulcanization most weak location Row pressure is carried out when more than sulfuration effect needed for vulcanization substitute bubble point, is vacuumized, and is taken out tire, is completed vulcanization.