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Floating oil seal precautions

Update:2018-11-21

Floating oil seal is a common name for floating seal. It is a kind of mechanical seal in dynamic seal. It has super sealing performance in harsh working environment such as multi-pulverized coal, silt and water vapor. It is a compact machine. Sealed, mainly used in low speed and heavy load applications. 

It consists of two identical metal rings and two rubber rings. Its working principle is that a pair of rubber rings form a closed space with the cavity under the support of the metal ring (but not in contact with the shaft). The ground surface is tightly fitted and relatively slid, ensuring good operation on the one hand, and effectively blocking dust, water, sludge, etc. from the outside, and protecting the internal lubricating grease from leaking.

(1) Before installing the floating oil seal, check whether the surface of the journal is too rough and there are no scratches, especially if there is a long scar along the axial direction. If the surface of the journal is too rough, it is easy to damage the oil seal or accelerate the wear of the lip 1:3, destroying its sealing performance. 

If the surface of the journal is damaged due to improper disassembly, the oil seal lip and the surface of the journal will not be tightly attached, resulting in oil leakage. In the above two cases, the lathe can be rounded or the new shaft can be replaced after the surfacing is re-welded according to the specified journal size. If the journal has only metal burrs or flashing of the shaft head, it can be smoothed with a trowel to prevent the oil seal from being damaged when the oil seal is installed.

(2) Check the floating oil seal lip for breakage, cracking or oil corrosion. If there is any such bad phenomenon, replace the new oil seal.

(3) When installing the skeleton oil seal in the floating oil seal, in order to prevent the oil seal lip from being deformed by stretching or scratching, special installation tools must be used. 

If there is no such tool, it can be installed by the following method: firstly on the journal or even the shaft head, roll a transparent hard plastic film (commonly called cellophane), apply a little oil on the surface, and wrap the oil cover in the plastic. The shaft head of the membrane is evenly pressed to push the oil seal to the journal, and then the plastic film is taken out. Note: Do not misalign the direction of the lip, so that it faces the inside of the reservoir, and the side with the trademark and specification faces the outside. 

Because the lip 1:3 can only be sealed in one direction, if the oil is packaged in reverse, it will inevitably cause oil leakage, and the sealing effect will be weakened or invalid. It is necessary to avoid slamming the oil on the surface of the oil seal by using a tool such as a hammer or a hammer or the like, otherwise the oil seal may be damaged.

(4) During the installation of the floating oil seal, the oil seal (especially the lip part) and the shaft neck position should be kept clean, and be careful not to let the oil seal self-tightening spring jump out of the spring groove. If the self-tightening spring is slack, the elastic force is weakened, and it can be cut off one by one, and the ends of the two ends can be firmly connected to continue to use.