Technological progress of the hottest tire curing

2022-10-24
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Technical progress of tire setting vulcanizer

the technical progress of tire setting vulcanizer is mainly reflected in the following aspects:

main structure of setting vulcanizer crank connecting rod tire individual vulcanizer is the predecessor of crank connecting rod setting vulcanizer in the 1950s. At that time, the crank connecting rod mechanism of the individual vulcanizer could not realize the vulcanization process of the tire and many related operations, such as tire loading, water tire loading (capsule), shaping, pressure mold locking, vulcanization, mold opening, water tire pulling, demoulding, etc. In order to realize the mechanization and linkage of the above process, the idea of setting the capsule control mechanism and its accessories in the center of the lower mold was put forward and put into practice, and the current crank connecting rod shaping vulcanizer was invented. The appearance of this vulcanizer not only greatly improves the vulcanization quality of tires, but also realizes the integration of multiple machines, multiple processes and automatic production in the rubber industry, which reduces the labor intensity and improves the working environment

after more than 30 years of exploration and practice, especially since the 1980s, the design, manufacture and use of domestic crank and connecting rod curing press have greatly improved the quality of domestic crank and connecting rod curing press through digestion, absorption and innovation. The technical level has been close to the foreign advanced level. In addition to meeting the needs of domestic tire enterprises, a considerable number of curing presses are exported to Japan, the United States and other developed countries every year

although the centering accuracy of the crank connecting rod shaping vulcanizer has been greatly improved through efforts, due to the inherent defects of its structure, it is still limited to high-grade radial tires. In this case, in the 1980s, industrialized countries launched a hydraulic curing press, which adopts a plunger cylinder structure with good centering and positioning. The movement is quite stable, and the operation is quite convenient, which is very suitable for the curing of high-grade radial tires. In the promotion of meridian today, this vulcanizer has a good prospect. According to the information, at present, the international main manufacturers understand that the model and scope of application of pressure testing machine require tire companies to use hydraulic vulcanizing machines, accounting for 60%

the central mechanism of the curing press is the key device of the main functions of the curing press. In the early stage of the shaping vulcanizer, the B-type central mechanism was first used on the shaping vulcanizer. At that time, the shaping vulcanizer was mainly used on bias tires, and there was no obvious contradiction in the alignment problem during shaping. Under this condition, industrialized countries introduced a central mechanism called type A, which has a simpler structure than type B and does not need complex central mechanism and vacuum system. However, with the meridian of the tire, the alignment problem during shaping is obviously exposed, so this type a center mechanism is less and less used, especially on large and medium-sized tires

although the centering problem of type B central mechanism is better than that of type A, air will remain between the capsule of type B central mechanism and the inner wall of the raw tire during operation, affecting the quality of the tire. Its mechanism is also complex, and it is also difficult to replace the capsule. In order to overcome the problems of A-type neutral difference and waste of medium when the internal pressure medium enters the capsule, while retaining its characteristics that it does not need a vacuum system, a C-type central mechanism appears. However, the C-type central mechanism forced the capsule to pull down by the air cylinder, which affected the service life of the capsule, and then the rib type central mechanism appeared. With the technological progress of the central mechanism, the tire curing press has more room to choose the central mechanism

the vulcanization medium used in the finalization vulcanizer generally adopts direct or deaerated hot water devices in the vulcanization mode, so the development prospect of this product is 10 points optimistic about providing hot water. The former has low production cost, but it is easy to cause oxidation of equipment and capsules, affect the service life of capsules, and corrosion of pipelines. Most tire enterprises use deaerated hot water devices to provide hot water, The temperature and pressure of hot water are controlled and adjustable respectively, and hot water with stable temperature and pressure can be continuously injected into the capsule for circulation during the whole vulcanization process. However, the preparation of thermal medium requires more energy and higher equipment and plant investment, which will significantly increase the production cost. In the steam vulcanization mode, the medium temperature is high. Usually, the steam pressure filled into the capsule is 1.4m ~ 1.6Mpa, and the corresponding temperature is 197 ℃ ~ 203 ℃, which can shorten the vulcanization time and improve productivity. However, the vulcanization pressure is completely restricted by the steam temperature, so the vulcanization pressure cannot be increased any more. Due to the appearance of radial tires, higher pressure is required for vulcanization, which cannot be achieved by steam

the new vulcanization process first developed by some tire companies in the United States, Japan, the former Soviet Union and France uses inert gas or nitrogen as the vulcanization medium. Compared with hot water vulcanization, nitrogen vulcanization has the advantages of saving a lot of energy, improving tire quality, extending capsule life, improving production efficiency, reducing scrap rate, operating safety and protecting the environment. At present, advanced countries have basically used nitrogen as the vulcanization medium, and China should develop and apply it as soon as possible

The latest development trends of the tire setting vulcanizer include:

the tire setting vulcanizer is integrated with the tire forming machine. In order to save energy, improve production efficiency and save land, it can not only significantly improve the processing and utilization environment of plastic, but also form a sequential process integration with the fully automated tire forming machine. At the same time, the embryo entering the vulcanizer from forming is a hot embryo with high temperature. In order to adapt and match the connection between the molding machine and the vulcanizer, the structure of the tire shaping vulcanizer and the structure of the molding machine should be designed into an interconnected structure, so that the formed embryo can smoothly enter the next process

all electric

in recent years, injection machines in the plastic industry have developed from hydraulic transmission to electric. Electric drive has many advantages, such as reliable operation, long service life, simple maintenance, low cost and good working environment. The new all electric plastic injection machine has been successfully developed and passed the appraisal

simplify the mechanical type of the kinematic pair

at present, the pressure mechanism of the crank connecting rod shaping vulcanizer can produce the required pressure and provide sufficient operation space, but the structure is too large, cumbersome and the number of kinematic pairs is too large, which leads to excessive steel consumption, manufacturing difficulties and affects the centering accuracy during shaping, resulting in the congenital deficiency of the crank connecting rod shaping vulcanizer. Therefore, it is imperative to develop a mechanical vulcanizer with simplified kinematic pairs

electric heating, microwave heating

due to various reasons, the number of tire enterprises adopting nitrogen vulcanization is still small, but a consensus has been formed on the advantages of nitrogen vulcanization, and the development trend is relatively clear. In order to integrate with today's fully automated tire production technology in the next 20 (30) years, the use of electric heating or microwave curing heating as the heating source of vulcanization has been put on the agenda. In order to realize this kind of heating, the designed mold and central mechanism must be designed accordingly

intelligent control system

intelligent control system includes three contents: first, it can automatically adjust the vulcanization degree and vulcanization time according to the specific situation in the vulcanization process, so that the tire can obtain the optimal vulcanization quality and improve the production efficiency; Second, it can realize full-automatic monitoring for single machine and group control for multiple machines; The third is the full-automatic management function of the vulcanization operation of the vulcanizer. In the future, the intellectualization of the control system of the curing press will be developed more rapidly

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