The rubber hose was started at the beginning of the last century, with braided material as the reinforcement structure of the hose. At first, the hose was reinforced with yarn woven by vertical knitting machine, while the steel reinforcement was started in the 1920s, with horizontal knitting machine producing steel wire-reinforced rubber hose with 15-18m long steel core.
The emergence of automobile hydraulic braking devices in the mid-1930s, as well as the emergence of hydraulic devices in machine tools, construction equipment, underground mining, oil mining and other equipment in the 1940s and 1950s, as well as the development of offshore oil, rapidly expanded the hose market and made the hose industry obtain rapid development.
According to statistics, the hose output of Europe in 1997 has reached 240,000 tons, the hose output of North America is 130,000 tons, and the hose output of Japan in 1998 is 280,000 standard meters, the hose output of Our country is 100 million standard meters. A comprehensive view of the world, the hose industry has entered a slow growth period, the market tends to saturation, the hose industry must be further rationalized reform, opportunities and challenges coexist.
As is known to all, the development of hose industry in foreign countries is closely related to automobile, machine tool, construction industry, underground mining, oil exploitation and offshore oil drilling. As the accessories of the above industries, hose has shown a strong vitality and also gave birth to many famous hose manufacturing enterprises.
Foreign hose production equipment status
In recent years, most foreign hose manufacturers use vacuum cold feed extruder with filter rubber device (and began to use granulated rubber), can not only ensure the hose diameter, diameter, wall thickness size, to reach the specified eccentricity rate, and eliminate impurities. In the 1990s, American Actoetrix and other companies applied laser technology to measure the size of hoses and realized the automation of measurement, feedback and adjustment. In addition, the application of shearing machine head extruder, composite extrusion process and the extrusion process of staple fiber reinforced rubber. So that the hose production in United States and Europe has further improve the degree of continuous production. In the molding process, is still hard core method, soft core method and no core method of three. However, the soft-core method is generally adopted and is generally suitable for large-length hoses with diameters below 38mm. In addition, there are also some factories that use the coreless method to produce hoses, and adopting steel wire tightly woven or wound can implement the continuous production of large length of hoses (the coreless molding process can continuously apply tension and prestress to the skeleton material of hoses, so as to improve the reliability of hoses).
From the point of view of some hose manufacturers, the use of advanced performance, high degree of automation of the wire braiding machine, winding machine, as well as supporting the use of wire shearer, wire machine.
Such as the United States Magnatech company production of RB - 2 type high speed braiding machine, 225 - type II high speed braiding machine, WSWII precision steel wire winding machine and Mayer MR1 type steel wire knitting machine produced by our company are widely application, according to the statistics of type RB braiding machine in Europe and North America have nearly 280 units, 225 I type high speed braiding machine in Europe and North America have used nearly 950 units, WSWII type precision steel wire winding machine in Europe and North America have 49 in use, and Mayer MR1 type high speed braiding machine produced by our company due to the comprehensive performance. Price advantage is more popular among hose manufacturers, so thousands of machines were used.
The above indicates that the steel wire braiding and winding equipment used in high pressure hose production abroad is very perfect, realizing the high-speed, continuous, combined configuration automatic production. Foreign hose industry development trend of hose undoubtedly obtained great development, from the beginning until today in development of limited types and specifications involved in hydraulic engineering machinery, oil drilling, aerospace, automotive, Marine, mining, many fields such as agriculture, water conservancy, the use of types of hose to one hundred kinds of hose specification which tens of one thousand species, according to ISO/TC45 45 (international organization for standardization technical committee) SCI hose statistics of the technical committee, has formulated the hose standard has more than 77 items, There are 20 international standards relating to hose test methods.
In recent years, due to the increasing demand for environmental protection, the use of unleaded gasoline and the use of refrigerant R134a require hoses to be made of a suitable adhesive to meet environmental protection requirements. At the same time, people pay more attention to the application of flame retardant and flame retardant hoses. With the emergence of more sophisticated mechanical equipment, higher requirements are put forward for the hoses used. For example, it requires a better bending radius and a lighter weight. It is also hoped that the hose industry will follow the tyre industry in recycling waste hoses to avoid polluting the environment. With the emergence of new materials, thermoplastic elastomers are widely used, and the hose industry will also get rapid development.