Fasteners, also known as standard parts on the market, are a general term for a class of mechanical parts used to securely join two or more parts (or components) into one piece. It is widely used in various machinery, equipment, vehicles, ships, railways, bridges.
“Fasteners, also known as standard parts on the market, are a general term for a class of mechanical parts used to fasten two or more parts (or components) into one piece. It is widely used in Machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, instruments and supplies, etc." Luo Baihui, secretary general of the International Model Association, said that with the development of China's manufacturing industry, fasteners One of the products with a large import and export volume in China is in line with international standards. It has important practical significance and strategic significance for promoting the Chinese fastener enterprises to the world and promoting the full participation of fastener enterprises in international cooperation and competition.
Due to the specifications, dimensions, tolerances, weights, performance, surface conditions, marking methods, and specific requirements of inspection and inspection, marking and packaging for each specific fastener product, it is specified in several national (industry) standards. For example, there are English, German and American systems.
The machinery industry is one of the main users of fasteners. Due to China's late understanding of the important position of mechanical basic parts in the machinery industry, long-term lack of investment has resulted in poor foundation, weak foundation and weak strength. In particular, with the improvement of the level of Chinese mainframes, the bottleneck of mechanical basic components behind the mainframe has become increasingly apparent. In recent years, although the state has given certain support in terms of technology introduction, technological transformation, scientific research and development, etc., compared with the current market demand and foreign level, there is still a big gap, which is manifested in: low product variety and low level. The quality is unstable, the early failure rate is high, and the reliability is poor.
Fasteners, as the main basic parts of the machinery industry, the development of the machinery industry, also put forward higher requirements for fastener products. Luo Baihui believes that the current domestic standard fasteners have been oversupplied, and high-end fasteners (high temperature, special-shaped, titanium-plastic composite, special properties and other fasteners) are in short supply, but also rely on imports. The National Machinery Bureau listed "common standard fasteners" as restricted development products, and "high-strength shaped fasteners" as current encouraged development products. With the improvement of national industrialization level and technological progress, the use of high-strength fasteners has gradually increased.
During the 12th Five-Year Plan period, the number of construction machinery products such as loaders, excavators and road rollers will reach 6 million units, and the annual sales volume will be around 50,000 units. Based on this estimate, the annual demand for high-strength fasteners is about 20,000 to 30,000. Ton. The basic parts represented by fasteners are not only the basic industries of China's equipment manufacturing industry, but also an important foundation in all fields of national economic construction. During the 12th Five-Year Plan period, while maintaining some cost advantages, the industry must rely on new advantages such as technological advancement, quality improvement and product cost performance to achieve sustainable development. It is estimated that by the end of 2015, the total output of the whole industry will reach 7.5 million to 8 million tons. Under the overall situation of expanding exports, the export products will show an upward trend. The average annual export growth rate during the 12th Five-Year Plan period is 8% to 10%. By 2015, the total export volume of the whole industry will reach 30 billion yuan.
Domestic fastener manufacturers should look to the future. National key construction projects such as “high-speed railâ€, “aerospaceâ€, “highway†and “airport†are providing opportunities for enterprises to move to the high-end. Boeing plans to add 3,400 aircraft in the next 20 plans. The National Development and Reform Commission invested 800 billion yuan to build rail transit in six cities. According to the plan of 36 urban rail transit projects, the new rail mileage will reach 6,560 kilometers and the demand for rail fasteners will reach 55. - 7 billion yuan. These large-scale projects will greatly increase the demand for high-end fasteners such as high-strength fasteners and titanium alloys. It is not impossible to remove the "low-end" labels.
Hydraulic Pump
Hydraulic pumps are
used in hydraulic drive systems and can be hydrostatic or hydrodynamic. A
hydraulic pump is a mechanical source of power that converts mechanical power
into hydraulic energy (hydrostatic energy i.e. flow, pressure). It generates
flow with enough power to overcome pressure induced by the load at the pump
outlet. When a hydraulic pump operates, it creates a vacuum at the pump inlet,
which forces liquid from the reservoir into the inlet line to the pump and by
mechanical action delivers this liquid to the pump outlet and forces it into the
hydraulic system. Hydrostatic pumps are positive displacement pumps while
hydrodynamic pumps can be fixed displacement pumps, in which the displacement
(flow through the pump per rotation of the pump) cannot be adjusted, or
variable displacement pumps, which have a more complicated construction that
allows the displacement to be adjusted. Although, hydrodynamic pumps are more
frequent in day-to-day life. Hydrostatics pump which are of various types works
on the principle of Pascal's law. It states that the increase in pressure at
one point of the enclosed liquid in equilibrium of rest is transmitted equally
to all other points of the liquid, unless the effect of gravity is neglected.
There are different types of hydraulic pumps as below:
1. Gear Pumps
2. Piston Pumps
3. Vane Pumps
Hydraulic Pump
Hydraulic Pump,Rexroth Hydraulic Pump,Electric Hydraulic Pump,Hydraulic Hand Pump
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