Oil film bearing seal system is the key part of the oil film bearing, with double role: on the one hand prevent the lubricating oil in bearing body cavity leaked out, and make oil from case to return to the pump station, ensure that form the continuous oil film; On the other hand prevent external cooling water, rolling oil (emulsion) and scrap iron , dust and debris into the bearings in the body cavity, maintain the normal operation of the bearing. If seal failure, will lead to the outside world sundry invaded, make oil pollution ageing, reduce oil film bearing life; Can also result in the body cavity lubrication leakage, not only caused a lot of oil consumption waste, and the oil will rotate along the roll the tangent of the throw, splashed down to the steel rolling out with, the steel plate surface, causing pollution, increase annealing difficulties, the influence on the strip steel quality. Therefore, to improve the oil film bearing seal structure, and advance the performance and life is the seal oil film bearing technology development of one of the important topics.

1 structure characteristics

The oil film bearing seal technology and structure development has passed through several stages, at present, China's metallurgical enterprise large rolling mill in the main use is the third, fourth generation sealing structure, and x, DF type seal.

X seal belong to the third generation of the oil film bearing seal structure, is the patent of the United States Morgan company (MORGON) . Its characteristic is sealing section approximate English letters "x", seal surface has A, B, c, D, E five lips mouth. D, E is the mouth sealing lip, D is oil sealing lip, E is water sealing lip, lips mouth at the end of a general for 5 mm thickness or so, and contact with sealing baffle , by compressed over surplus and sealing function up.

DF seal is in x sealing structure to optimize and improve generation, people call it the fourth generation of seal. The section of seals and DF x have similar, working principle basic same. But in three aspects the optimal:

(1) the two sealing lips mouth D lips, E lip to bevel, lips mouth edge thinning, strengthen the lips mouth follow.

(2) the bevel angle sealing baffle instead, seals produce axial channeling when move two lips mouth compression basic equal, lips mouth won't appear clearance.

(3) the mechanism of sealing the negative pressure and the principle of suction pump, sealing effect improved remarkably. DF reduce the leakage seal, and to reduce the cost of fuel consumption, seal life has increased greatly, improve the quality of steel plate surface.

 
The actual production application, x seal because of large amount of interference, seals badly worn, short life; And high-speed roll exist ,when axial channeling move, and sealed with a baffle angle, D lips mouth or E lips mouth and cover the question of easy to form the moment from, and x seal lips mouth thick, follow the sex difference, easy cause serious leakage, fill the system. So x seal has gradually be replaced DF seal.
 
 



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