Analysis of the research ability and demand of China's seal products
The rapid development of China's economy requires a large number of construction machinery, especially some high-pressure hydraulic machinery, and the current level of China's seals is far from meeting the domestic demand for seals. It is a very urgent need for the seal industry. The problem to be solved. The design and application level of the sealing system depends on the development capability of the sealing product, which is mainly manifested in three aspects.
First, for the design of static sealing system, the sealing products of plant fiber and asbestos material are gradually eliminated, but the sealing parts of chemical polymer materials are not widely used in some liquid static sealing devices. At present, domestic hydraulic rubber seals and anaerobic rubber seals can be applied to hydraulic seal systems. The domestic seals are relatively small, and the manufacturing level and quality stability are far from the imported seals.
Second, for the shaft rotary dynamic sealing system, most of the market still uses the ordinary standard type oil seal. When the shaft rotary dynamic sealing equipment has pressure design requirements, the domestic pressure-resistant oil seal seal provides the pressure level of 1 to 3. MPa, while imported seals can provide 10 MPa pressure resistance level, at least 3 times more than domestic products. For dynamic hydraulic pressure seal seals, there is no universal application in mechanical shaft rotary sealing system. .
Third, for the hydraulic cylinder block reciprocating motion sealing system, the majority of the domestic engineering hydraulic machinery on the market, the main seal design of the hydraulic cylinder dynamic sealing system, generally use U-shaped seals. By the time the engineering hydraulics of the 1990s, the design of the reciprocating dynamic sealing system of hydraulic cylinders began to use a more complex U-ring and coaxial seal assembly composite design. At present, the internationally mature design has 5 sets of ring, 4 sets of rings, 3 sets of rings, 2 sets of rings, etc., which are applied to the piston belt support ring of the hydraulic cylinder block, and the combination ring is used as the sealing component. More complex, domestic design and manufacturing capabilities can not be mass-produced, the quality level of the combination circle is still relatively poor.
China is also constantly introducing advanced foreign science and technology and manufacturing processes. The domestic engineering machinery manufacturing industry has also made great progress. The advanced design level of hydraulic sealing devices for engineering hydraulic machinery, the working high pressure resistance, and the reliability of sealing system work. And so on have a great improvement. China's sealing industry has also made great progress, gradually changing the business model of low-power, high-energy small enterprises. The industry's resource mix and the launch of some large-scale sealing projects will be a high-efficiency, low-energy industry. Consumption, high intensification, and enterprises are becoming more and more large-scale. The quantity and quality level of China's seal products will gradually approach and reach the international advanced manufacturing level.