The outer iron shell DKB dust-proof oil seal is divided into DKB and DKBI types.
The DKB type is generally made of nitrile rubber, and special fluorine rubber can be used. The DKBI type is made of polyurethane (TPU or CU). The upper and lower lips are used in the piston rod of heavy-duty reciprocating hydraulic cylinders to prevent dust, dirt, sand and metal powder from entering. The dust scraping effect is good and the oil scraping effect is even better. It can effectively protect equipment and maintain the performance of seals. The external leakage iron frame and the installation groove are tightly fitted and the structure is relatively simple and easy to install. DKBI is divided into several parts: lip end, sealing lip, dust-proof lip and matching part.
- Lip end: It is in the shape of an oblique wedge. It presses the shaft surface at the end to seal the fluid.
- Sealing lip: The sealing lip is a flexible elastomer, designed to maintain a stable sealing effect under the influence of mechanical vibration and pressure changes of the sealing fluid, and to maintain stable contact between the lip and the shaft surface. . In addition, the spring component can increase the pressing force of the sealing lip to the shaft and maintain this pressing force.
- Dust-proof lip: The dust-proof lip is the auxiliary lip that does not contact the spring. Play the role of preventing dust intrusion.
- Fitting part: The fitting part is when the oil seal is fixed in the cavity hole, and it prevents fluid from leaking and intruding from the contact surface between the outer peripheral surface of the oil seal and the inside of the cavity. In addition, the metal skeleton is when the oil seal is fixed in the cavity. , plays a protective role.
