SU774634A1 - Hydrodynamic bearing for rolling mill rolls - Google Patents

Description

one

The invention relates to the field of metallurgical equipment, to the improvement of the design of hydrodynamic bearings and can be used for high-speed growth bearings of rolling mills.

Hydrodynamic liners for rolling mill rolls are known that contain an insert sleeve with pockets, 10 fixed in a housing that has cavities for supplying lubricating fluid, a pin sleeve covered by an insert bush and fixed stationary relative to the roller, lubricates 15 fluids from the cavities for supply enters the pockets of the liner, from which then enters the gap between the rubbing surfaces (liner and bushings) and then through the 20 ends of the bearing part of the lubricant, the liquid flows out. The other part of the heated lubricant is captured by a pin bushing and carried into the cavity for inlet, and since at the same time, another bearing of lubricant is fed to the bearing, i.e. a backpressure is created, the part-heated lubricating fluid does not flow out through the ends of the bearing, remains in the card-EO

the sleeve is inserted as a result of which the temperature of the lubricating liquid rises 1.

The disadvantage of this design of hydrodynamic bearings is a small withdrawal of the heated lubricating fluid when it leaves the working gap directly, which results in a decrease in sliding speeds and load capacity. At the same time, the bearing bearing surfaces work in less severe conditions, which reduces the durability of the bearing .

Known hydrodynamic bearing, which contains a shaft covered by a sleeve or housing with pockets having cavities for the supply and removal of lubricating fluid. The pocket, located in front of the working gap in the direction of rotation of the shaft, is made closed and serves only to supply lubricating fluid, while the pocket, located after the working gap, is open and serves only to drain the heated lubricating fluid

2

The lack of knowledge of the hydrodynamic bearing design is that such a constructive implementation does not allow the same bearing to be used for different directions of rotation of the shaft, since when changing the direction of rotation of the shaft, the pockets for supplying and discharging the lubricant should be reversed, and the design does not allow this to be done, since the pocket for the inlet is made closed and for the withdrawal is open. The same makes it impossible to alternately use the working areas of the liner, which reduces the durability of the bearing. In addition, the absence in the pocket for removal of the lubricating fluid regulating cpeiicTB in the zone of connection with the outer surface unnecessarily increases the flow of lubricating fluid through the bearing under various operating conditions (speed, load). which reduces the economic efficiency of the bearing. The aim of the invention is to increase the durability of the bearing by improving the removal of the lubricant liquid from the working area. This goal is achieved by creating a hydrodynamic bearing for rolling mill rolls containing an insert bushing with pockets fixed in a housing having strips for supplying and discharging the lubricating fluid, a pin bushing covered by the insert bushing and fixed stationary relative to the roll. In this case, the bearing housing is made with pockets located outside the working area of the bearing and connected to the pockets of the liner insert through the verstier, and with the supply and removal cavities of the lubricant through the provided chokes, and any of the housing supports can be connected with an open throttle - with a cavity for removal of heated lubricating fluid, and with a closed throttle with a cavity for supplying lubricating fluid. Such a constructive implementation of the hydrodynamic bearing of the rolling mill rolls makes it possible to increase the durability of the bearing by improving the removal of the lubricant from the working area with simultaneous use of the working areas of the insert bush. In addition, this structural design of the bearing allows it to be used for different directions of rotation of the roll ..,; FIG. 1 shows a hydrodynamic bearing of rolling mill rolls, a cross-section in FIG. .2 - the same longitudinal section. The hydrodynamic bearing for rolling mill rolls contains an insert bushing 1 with pockets 2 and 3 fixed in a housing 4, having cavities for supplying 5, b and for diverting 7 lubricating fluid, an adapter sleeve 8 mounted fixedly with respect to roller 9 covered by the insert bushing The bearing housing 4 is made with karanas 10 and 11 located outside the other bearing area. Each of the pockets 10 and 11 of the housing 4 is connected to one of the feed pockets 2 3 bushings 1 through the holes 12. In addition, each of the pockets 10 11 of the housing 4 through the provided chokes 13 and 14 and the stopper 15 can be connected either to the rest 5 or 6 long. supply, or only with a cavity 7 for drainage. The device works as follows. In the initial position, in preparation for working to rotate the roll 9 in the direction indicated in FIG. 1, an arrow, a cavity 5 is open for supplying a lubricating fluid, a cavity 6 is closed by a stopper 15. At the same time, the throttle 14 is closed to drain the lubricating fluid, and the throttle 13 is closed for diversion. During the rotation of the roll 9, the lubricating fluid from the cavity 5 enters the pocket 10 of the housing 4 and then through the opening 12 enters the pocket of the liner bush 1,. A part of the lubricating fluid is captured by the rotating sleeve-pin 8 in the working area between the liner sleeve 1 and the sleeve-pin 8, as well as the lubricating fluid in the pocket 2 is supplied under pressure, the other part of it drops into the gap 16. After the lubricant passes through the working area and the gap 16, the lubricating fluid partly flows out through the ends of the bearing, the remaining lubricating fluid enters the pocket 3 of the bush-in-mouth Breath 1, then through the opening 12 into the pocket 11 of the housing 4 and through the currently open throttle 13 to the cavity 7 and lubricating fluid. The amount of lubricant discharged from the bearing is regulated by the choke 13. As the working surface of the liner is worn, the latter is turned 180, while pocket 3 takes the place of pocket 2 and vice versa. And the work can go on again. If it is necessary to rotate the roll 9 in a direction opposite to the direction of rotation indicated in FIG. 1 with an arrow, cavity 6 and choke 14 are opened, and cavity 5 is closed by plug 15, while choke 13 is also closed for draining the lubricant. The proposed hydrodynamic bearing, in comparison with the known ones, makes it possible to increase its durability, i.e. increase the service life of the bearing by about 20%. Greatest effect

Claims (1)

Claim A hydrodynamic bearing for rolls of rolling mills, comprising an insert sleeve with pockets fixed in a housing having cavities for supplying and discharging lubricating fluid, an axle sleeve covered by an insert sleeve 'and fixedly mounted relative to the roll, characterized in that, in order to increase bearing life by improving the drainage of the heated lubricating fluid from the working area, the bearing housing is made with pockets located outside the working eons of the bearing and connected to the pockets of the liner of holes and cavities with the supply and removal of lubricating fluid - drosj by mudflow, wherein any of the pockets is connected to the housing at the open throttle ό cavity for discharging heated lubricant, and when a closed-throttle - to the cavity for supplying smazyvayuto boiling liquid.