Sealing device for oil film bearing of roller shaft of rolling mill

Abstract

The invention discloses a sealing device for an oil film bearing of a roller shaft of a rolling mill, which comprises a sealing cover fixedly arranged on a bearing seat, a taper sleeve lengthening ring fixedly arranged on a taper sleeve and a labyrinth ring fixedly arranged on the taper sleeve lengthening ring, and the sealing cover is provided with a sealing ring positioned on the inner side and a water blocking ring positioned on the outer side. The labyrinth ring comprises a water sealing ring opposite to the end face of the roller and a water return ring located between the water sealing ring and the water blocking ring, a static sealing ring capable of forming static sealing fit with the end face of the roller is installed on the water sealing ring, and a water sealing and oil sealing mechanism matched with the outer wall of the taper sleeve lengthening ring and the inner wall of the water return ring is installed on the sealing ring. The outer wall of the water return ring is provided with threads which enable accumulated water in a groove between the threads to be thrown out towards the outer side of the end face of the roller shaft in an inclined mode when the roller rotates, and the section of the water blocking ring is rectangular. After the roller shaft oil film bearing is applied, the stable and reliable sealing effect can be achieved.

Description

technical field [0001] The invention relates to the sealing of oil film bearings on roll shafts in rolling mills of steel mills, in particular to a sealing device for oil film bearings of roll shafts in rolling mills. Background technique [0002] Oil film bearings are often used at both ends of the rolls of large rolling mills in steel mills to withstand the huge rolling force. Oil film bearings, also known as liquid friction bearings, mainly include two parts: the bushing fixed in the bearing seat and the tapered sleeve rotating with the roll. The resistance generated by the complete pressure oil film realizes the load bearing. Therefore, oil film bearings need to have good oil supply conditions when they work. In addition to a reasonable oil supply system, a reliable sealing device must be installed between the fixed bearing seat and the end face of the rotating roll. The sealing device has the ability to block external cooling water and The dual function of intrusion o...

AI Technical Summary

Problems solved by technology

[0005] This sealing device includes static seals, labyrinth seals and multiple sets of dynamic seals. Although there are many sealing lines of defense, oil film bearing seal failures still occur from time to time in actual use, and the sealing performance is not stable. The main reasons are as follows : First, the external cooling water flow rate of the sealing device is very large, and with a certain pressure, the sump on the labyrinth ring is often filled, and a large amount of water cannot flow in time, which will further break through the following sealing lines. The labyrinth ring rotates at high speed with the rollers, and the linear velocity of the sump is relatively high. The water inside is thrown out under the action of centrifugal force and cannot flow to the bottom smoothly; second, the full glue seal lip and the corroded The rough surface of the labyrinth ring is in contact with it, which is easy to wear quickly, and the actual sealing effect is not good. When there is a lot of water, the sealing ability is limited; third, after the cooling water breaks through the sealing defense line formed by the full glue seal and the labyrinth ring, there is no obstruction in the middle, and it directly reaches the To the sealing defense line formed by the cloth oil seal and the tapered sleeve extension ring; fourth, the two cloth oil seals are installed back to back, and only the cloth oil seal close to the oil film bearing acts as an oil seal, and there are only one oil sealing defense line; fifth. , the full glue water seal and the two cloth oil seals are installed on the sealing cover through the gland, and the installation and replacement work is relatively cumbersome; sixth, the cloth skeleton of the cloth oil seal is easy to shrink when soaked in lubricating oil, which is easy to cause clamping The static seal formed by the outer diameter of the cloth oil seal and the sealing cover fails

Images