Jack is one of the most simple lifting equipment with lifting height of less than 1 m, using jacking rigidity as a working device, through the top bracket or hold claw in the schedule at the bottom of the light and small lifting heavy lifting equipment.Divide into two kinds, mechanical and hydraulic jack is mainly used in mines, transportation and other departments as vehicle repair and other lifting, support, etc.The structure light and strong, flexible and reliable, one man can carry and operation.
Jack is divided into mechanical jacks and hydraulic jack, principle is different. In principle, the principle of hydraulic jack is based on PASCAL's principle, namely: the liquid pressure is the same everywhere, so, in a balanced system, the smaller piston top pressure is small, and the big pressure on the piston is bigger, it can keep the liquid stationary. Through liquid, so can be different on the different pressure, so that you can achieve the goal of a transformation.We are common to the hydraulic jack is to use the principle to achieve the force transfer.Mechanical jacks, using mechanical principle, in the past after pull (handle, claw namely rotary driving ratchet clearance, pull small bevel gear drive big bevel gear, make weight lifting screw rotation, so that the lifting socket for lifting or falling, and achieve the function of the lifting force. But not as easy hydraulic jack.
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In 2011, China's imports of machine tool products also continued to grow. Machine tool imports SKF bearings has reached 2.96 billion yuan, an increase of 35% over the same period last year. Internationally renowned enterprises have entered the Chinese market one after another and China will continue to maintain its position as the world’s largest importer and consumer.
While the production and operation of the domestic machine tool industry continue to maintain a good momentum, the import of machine tool products in China continues to grow this year. By the end of September, according to customs statistics, the import of SKF bearings for machine tools in China has reached 2.96 billion yuan, compared with last year. Increased by 35% over the same period.
Although in recent years, the SKF bearing tool industry in China has achieved great progress, but in the current extremely fierce competition in the domestic and international machine tool market, China's machine tool industry is not competitive, mainly in China is a machine tool Sweden's SKF bearing consumer power is not yet a powerful machine tool, but it has a large quantity of machine tools, but its level is low, product composition is still lagging behind, product innovation ability is poor, and machine tools are not reliable!
Some well-known international companies have entered China through wholly-owned and joint ventures, and have used China's cheap labor costs and various preferential conditions to seize the Chinese market.
This fully shows that today's international competition in the machine tool industry in modern manufacturing has gradually deepened into China's hinterland. China will continue to maintain its position as the world's largest importer and consumer.