RU2290562C2 - Centralized automated system for lubricating roller bearings and method of lubricating - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: system comprises lubricating station with liquid lubricant, unit for preparing air, oil-air feeders, control desk, device for control and alarm, pipelines for lubricant, compressed air, and oil-air, cushion provided with passages for supplying lubricant and with top and bottom lids, coupled collars separated by means of spacing washer with bearing whose remote rings receive nozzles set on the shaft pins. The outer surface of the bearing is sealed with inner surface of cushions. The top and bottom sections of the spacing washer interposed between the collars are provided with passages that connect the dummy passages made of the cushion lids and the space of the cushions with the ambient. The nozzles set in the spacing rings are provided with openings pointed in diametrically opposite directions along the axis of the bearing or at an angle of 0 to 90° to the ways of the outer races of the bearing. The method comprises batching the lubricant, mixing the lubricant with compressed air in oil-air feeders, supplying the mixture in the oil-air pipelines, supplying oil-air mixture to the ways of the outer races through nozzles, and discharging the exhaust lubricant to the ambient. The oil-air mixture is supplied through the nozzles with a flow rate directly proportional to the air pressure supplied to the oil-air pipeline to form continuous flexible hydrodynamic flowing film with a thickness of 5-50 μm .

EFFECT: enhanced durability and reduced lubricant consumption.

4 cl, 8 dwg

Description

The group of inventions, characterized by a single inventive concept, relates to the lubrication technique for assemblies of various machine tools, roller tables, mining mills, continuous casting machines, etc. and gears, where bearings are exposed to high temperatures, dust, water emulsions, harmful gases, in particular high-speed bearing support rolling stands of workers and backup rolls.

Currently, the most promising lubrication technologies include an oil-air lubrication system designed for centralized, automated, precisely metered lubrication and partial cooling of work rolls, both from an economic and environmental point of view.

In this method of lubrication, a precisely dosed amount of lubricant is supplied from a special oil-air unit to each friction site, and the lubricant is transported using a turbulent stream of compressed air, which compresses the dose of lubricant and transports it in the form of an oil film on the inner walls of the pipeline. Since oil and air are two separate media, distribution through a T-shaped screw connection is not possible. Each bearing must have its own connection to a central lubrication system.

The Rebs catalog contains a pneumohydraulic diagram for lubricating the bearings of rolling mill stands with oil-air lubrication, drawing 88106, which demonstrates the method of lubrication. The turbulent oil-air flow through the oil-air pipeline using a flow divider (German patent No. 2844995, F 16 N 7/30: a device for separating a dropping-type lubricating medium introduced into a carrier medium) is divided in half into both roll cushions. Each half already in the pillow channel with the help of two flow dividers is divided into three parts, which are directed through special nozzles through both distance bearing rings and are sprayed in the form of coarse droplets on the surfaces of the bearing rings, rollers and cages. The remains of oil-air lubrication by turbulent air flow are directed through a special additional channel into the cavity between the cuffs and lubricate the contacting surfaces of the cuffs with the neck surface and additional cooling of the neck, bearings and cuffs.

Such a lubrication system allows the most economical and rational use of lubricants and increase the durability of the bearing, but this system has the following disadvantages:

- it is impossible during operation to change the parameters of oil-air lubrication in one distance ring without violating the lubrication parameters in all other channels of lubrication of the bearing and seals (increase, decrease);

- it is impossible without disassembling the system to change the oil concentration in a given volume of air,

- special flow divider devices are required that are installed along the length of the channels in the bearing pillow, individually selected depending on the geometric dimensions of the bearing:

- in the pillow case, additional long channels of small diameters are performed for special lubricant supply to the cuff region, and if the pressure changes in the cuff, the lubricant supply to the bearing will be disrupted;

- a clean, fresh oil film is not used to lubricate the bearing, but goes, warms up on the cuffs.

As a prototype, the lubrication system of the roller bearings of the rolling mill stands was chosen. 1643854, F 16 N 7/32 29/04 of 04/23/1991, Bull. No. 15.

The rolling stand lubrication system for rolling stands consists of a reservoir, pump, filter, pressure line connected to reservoirs of oil-air feeders through shut-off valves controlled by level switch commands, as well as progressive distributors connected to oil-air feeders through valves switching and with a compressed air line equipped with a pressure signaling device and a multiplier with a shut-off valve, a non-return valve of the blocks of load speed and pressure sensors installed on the rolling stand of the bearing postglacial supports the discharge line. The system implements the optimal lubrication mode through the use of two parallel-working feeders, the interaction of which is regulated by the control unit.

According to the method of lubricating the lubrication points (bearing bearings), the lubricant is fed through the discharge line either with oil-air feeders or progressive distributors. Moreover, the selection of the operating mode is carried out by the control unit depending on the readings of the speed and load sensors installed on the stand. Under normal (steady-state) operation, the lubricant is supplied by the oil-air feeders (feed rate of the order of 20 ÷ 50 cm ³ / hour to the lubrication point).

At peak modes of speeds and loads, as well as during stand starts, after a long stop (more than 2 ^x hours), the feed is made by progressive distributors (the feed can vary from 40 to 100 cm ³ / min). Turning progressive distributor is as follows: after the velocity sensors or the load on the signal control unit exceeding a predetermined threshold value, or when the mill is turned on in operation after a long (over 2 ^hours) interruption control unit gives a command to turn the pump motor and moving the switching valve to the feed position from the distributor. At the same time, oil-air feeders operate normally. To improve the stability of the lubricant supply and increase the efficiency of the lubrication system, the oil-air feeder unit with progressive distributors is installed in close proximity to the lubrication points on the stands. And the oil-air feeders are equipped with autonomous reservoirs for lubricant. With such an installation, the length of the discharge lines is minimal, therefore, the lubricant from the oil-air feeders, moving in the form of a film along the walls of the pipeline, is transported stably, without breaks and settling in places of resistance. Thus, the lubrication mode of the bearings is close to optimal, and energy losses are minimized.

Refueling of oil-air feeder tanks is carried out according to signals from a level switch. The lower level relay instructs to turn on the pump motor and open the shut-off valves. At the command of the upper level relay, the pump motor is turned off, and the shut-off valves are closed.

To transport the lubricant, compressed air is supplied to the oil-air feeders. The compressed air line is equipped with a pressure stabilizer that provides a constant pressure after itself, which is necessary for the stable operation of the feeders and the maintenance of constant overpressure in the friction units. Based on a signal from the pressure sensors located in the bearing supports that the pressure has dropped below the permissible value, the control unit gives a command to open the valve. In this case, the high pressure cavity of the multiplier communicates with the compressed air line.

Thus, the rolling mill lubrication system with two parallel working feeders, speed, load and pressure sensors and a control unit that makes it possible to maintain the optimal lubrication mode, which has a multiplier, an air line, can significantly expand the range of its operation modes, increase efficiency due to overhead losses , as well as increase the reliability of the rolling stand as a whole.

The prototype lubrication system has the following disadvantages:

- structural complexity: the presence of two types of oil-air feeders and progressive distributors, speed and load sensors, which leads to the complexity of the control panel;

- high viscosity oils are not used, which favorably affect the contacting surfaces of the rollers and treadmills at peak (extreme) loads;

- the system is not tight and after 2 hours remains without lubrication, as it flows out, which reduces reliability and requires additional costs;

- the lubrication system is inertial - the system will work and give additional lubrication after peak immersion of the bearing. With an optimal lubrication mode, the bearing is lubricated before peak loading to prevent bursting of contact surfaces at peak loads and to reduce wear.

The basis of the invention is the task to expand the scope of centralized oil-air lubrication systems in extreme conditions (high temperature, high dustiness and contamination, extreme loads or rotational speeds) to ensure high-quality lubrication of bearings.

The technical result of the invention is the creation of an environmentally friendly and cost-effective centralized lubrication system of bearing assemblies with an air-oil film by creating a reliable sealed design of the bearing assembly, providing an economical and optimal lubrication mode for the contacting surfaces of the bearing, including at peak modes of speeds and loads, which is a decisive factor in solving the problem of durability and reliability of machines, increasing productivity and lower eniya production costs.

The problem is solved due to the fact that the centralized automated lubrication system of the bearing assemblies of the roller bearings of the rolling stand with an air-oil film contains a lubrication station 1 with liquid lubricant, an air preparation unit 2, oil-air feeders 3, a control panel 4, control 5 and signaling 6 devices, lubricant pipelines material 7, compressed air 8 and oil-air 9, pillows upper 10, lower 11 with channels for supplying lubricant (short, to the near remote ring) 12, (long, on the far distance ring) 13, with covers 14, 15, twin cuffs 16, 17, separated by a spacer washer 18, bearing 19, in the distance rings 20, 21 of which nozzles 22 are installed, mounted on the necks of the roll 23 .

According to the invention.

The outer surface 24 of the bearing 19 is sealed with the inner surface 25 of the pillows 10, 11, and in the spacer washer 18, installed between the cuffs 16, 17, in its upper and lower parts are channels 26, 27 connecting the blind channels 28, 29, made in the covers 14, 15 pillows 10, 11, and the cavity of pillows 10, 11 with the external environment, and nozzles 22 installed in the spacer rings 20, 21 are made with holes 30 directed in diametrically opposite directions along the axis of the bearing or at an angle from 0 to 90 degrees to the treadmills 31 of the outer rings 32 of the bearing 19.

The sealing edge of the outer cuff 16 is directed towards the external environment and is installed in such a way that under the increased pressure of compressed air in the pillow 10, 11 it forms a slot 33 with the contacting surface of the roll 23 for the exhaust air and lubricant residues to exit.

Also, the problem is solved due to the fact that the method of lubricating the bearing assemblies of the roller bearings of the rolling stand with an oil-air film includes dosing of the lubricant, mixing with compressed air in the oil-air feeders 3, and supplying the mixture to the oil-air pipelines 9, the subsequent supply of the oil-air mixture through the nozzles 22 to the outdoor treadmills rings 32 of the bearing 19 and the discharge of waste lubricant into the environment.

According to the proposed method:

The air-oil mixture is fed through the openings 30 nozzles 22 with an outflow rate directly proportional to the pressure of the air supplied to the oil-air pipe 9, with the formation of a continuous elastohydrodynamic flow film with a thickness of 5-50 μm, which ensures optimal lubrication and separation, including at peak loads contacting surfaces, and the output of compressed air and residual waste lubricant from the bearing cavity 9 into the environment is carried out through channels 26, 27, 28, 29 in p the washer and through the slot 33 formed between the sealing edge of the outer cuff 16 and the contact surface of the roll 23.

The output of compressed air and residual lubricant used to lubricate and cool the cuffs 16, 17 and the necks of the rolls 23, as well as to create an air barrier between the cavity of the cushion 10, 11 and the environment, creating a barrier to pollution and cutting fluids.

Such a lubrication system and method of its implementation eliminate the disadvantages of the prototype and allow:

- eliminate the leakage of lubricant from the bearing in view of the tightness and surface of the bearing,

- to prevent the ingress of scale, dust, dirt and coolant into the bearing cavity, which is possible due to the barrier created by the exhaust air flow in the bearing cavity and which fills the volume between the two cuffs and the spacer washer, creating an additional barrier to external pollution, due to which abrasive wear of surfaces bearing is eliminated, which reduces energy consumption.

- the excess flow of compressed air creates a sealed additional cavity between the pillow and the environment

An increase in the amount of lubricant in the bearing does not affect the thickness of the elastohydrodynamic film, but causes additional losses in mixing and heating of the excess lubricant. See the abstract of the dissertation for the degree of K.N.T. Dzyuba V.I. "Efficient lubrication systems for high-speed spindle assemblies on rolling bearings." ENIMS, Moscow, 1985, p. 7.

Therefore, it is necessary to supply such a volume of lubricant to the support that is necessary for the formation of an elastohydrodynamic film. Calculations that determine the volume of a lubricant, its physicochemical parameters, and the conditions for the formation of a constantly moving oil film, which ensures optimum lubrication and separation of contacting surfaces at peak loads, is a know-how subject.

A rationally selected lubricant with a viscosity of 35 ÷ 41 mm ² / s provides an increased thickness of the elastohydrodynamic film, increases the length of stay of the rolling elements for each revolution in the zone of the hydrodynamic friction regime and, accordingly, reduces the residence time of the rolling elements in the region of high loads. Before each next loaded rolling element, they are sprayed with a clean fresh oil film, and the increased viscosity of the oil reduces the specific load on the rolling elements and treadmills and creates a stable hydrodynamic friction of the bearing. Due to such friction and tightness conditions of the bearing and the pillow, the lubricant does not leak out and the mill can be put into operation without a huge amount of lubricant 40 ÷ 100 cm ³ / min. The design of the feeders used in the claimed lubrication system is constantly being improved by the applicant, see, for example, the application filed in Russia, "Serial lubricating oil-air feeder."

The practice of introducing the claimed system confirms that an increased amount of lubricant does not increase the thickness of the oil film and the sensors under peak conditions of speeds and loads do not contribute to the reduction of friction, therefore they only complicate the lubrication system, i.e. when sealing the bearing assembly, the need for them disappears. The lubrication system is simplified, reliability is increased.

The technical essence and principle of operation of the proposed centralized automated lubrication system of the bearing assemblies of the roller bearings of the rolling stand with an air-oil film are illustrated by the drawings:

Figure 1 - schematic pneumohydraulic diagram of a centralized automated lubrication system for roller bearings of a rolling stand with an oil-air film;

Figure 2 is a section along aa of figure 1, the supply of the air-oil mixture through channels 12 into the bearing cavity;

Figure 3 is a section along BB-1 of figure 1, the supply of the air-oil mixture through channels 13 into the bearing cavity;

Figure 4 - node G figure 2, 3 of the supply of the air-oil mixture into the cavity of the bearings through the nozzles 25;

FIG. 5 is a section along BB-1 of FIG. 1, exhaust air discharge from pillow cavities;

6 - node D of figure 5, the output of the exhaust compressed air and residual waste lubricant from the bearing cavity through the cover 14 through the channel 28, 26, 27, 29 into the atmosphere, and also through the slot 33 formed between the sealing edge of the outer cuff 16 and the contacting surface of the roll 23, in the mode of increased pressure of compressed air in the pillow 10, 11;

Fig.7 - node E of Fig.5, the output of the exhaust compressed air and residual waste lubricant from the bearing cavity through the cover 15 through the channel 28, 26, 27, 29 into the atmosphere, and also through the slot 33 formed between the sealing edge of the outer cuff 16 and the contacting surface of the roll 23, in the mode of increased pressure of compressed air in the pillow 10, 11;

Fig - an example of a specific implementation of the node G, in the embodiment, two holes 30 and an angle, for example, 11-17 degrees. the inclination of these holes to the treadmills 31 of the outer rings 32 of the bearing 19.

The implementation of the node G of Fig.2, 3 illustrate the supply of the air-oil mixture into the bearing cavity through the nozzles 22 with holes 30 directed to the diametrically opposite sides along the axis of the bearing or at an angle from 0 to 90 degrees. - this is the optimal change in the angle of inclination of the holes 30 to the treadmills 31 of the outer rings 32 of the bearing. 19

The centralized automated lubrication system of the bearing units of the roller bearings of the rolling stand with an oil-air film consists of the following units: lubrication station 1 with liquid lubricant; air preparation unit 2; oil-air feeders 3; control panel 4; controlling 5 and signaling 6 devices; pipelines of lubricant 7, compressed air 8 and oil-air 9; pillows of the top 10, bottom 11, with channels for supplying lubricant (short, to the near distance ring) 12 (long to the far distance ring), 13 with covers 14, 15; twin cuffs 16, 17, separated by a spacer washer 18; bearing 19; distance rings 20, 21 and nozzles 22 installed therein; the bearing is mounted on the necks of the roll 23; the outer surface 24 of the bearing 19 is sealed with the inner surface 25 of the pillows 10, 11 (the sealing material is not indicated by the figures in the drawings, however, its presence in the drawings is shown by the installation points of the sealing elements in FIGS. 2, 3); in the upper and lower part of the spacer washer 18 channels 26, 27 are made, connecting blind channels 28, 29 made in the covers 14, 15 of the pillows 10, 11, and the cavity of the pillows 10, 11 with the external environment; nozzles 22 are made with holes 30 directed to diametrically opposite sides along the axis of the bearing or at an angle from 0 to 90 degrees. to the treadmills 31 of the outer rings 32 of the bearing 19.

The sealing edge of the outer cuff 16 is directed towards the external environment. Pos. 33 denotes the gap formed by the sealing edge of the cuff 16 with the contacting surface of the roll 23 in the mode of increased pressure of compressed air in the cushion 10, 11, designed to exit the exhaust air and residues of lubricant

The operation of a centralized automated lubrication system of bearing assemblies is as follows

The system, see Fig. 1, starts to work in automatic mode after filling the lubricant station 1 with lubricant, supplying compressed air and electric power to the control panel 4. Next, the pneumatic pump is turned on, the lubricating oil is cycled, the pump travels and the lubricant is dispensed in the feeders 3. In this case, the lubricant through the system of pipelines of lubricants 7 enters the oil-air feeder 3, where dosing and mixing with air followed by entering the oil-air piping 9, see FIG. 2, 3, through the supply channels of lubricant 12 (short, to the near distance ring 20) and 13 (long to the far distance ring 21) in the pillows 10, 11. Next, the air-oil mixture enters the volume, the groove, into the channel formed by the inner surface pillows and the outer surface of the distance ring, see Fig. 2, 3, and then into the nozzles 22, which distribute the lubricant on the rolling surface of the outer ring of the bearing, see Fig. 4, assembly D. Lubricant enters the tracks of the inner rings of the bearing also lubricates with comparator. That is, in this way, the incoming lubricant is transferred via rollers (balls) to the inner rolling surfaces of the inner rings of the bearing. The sealing element is installed at the ends of the outer rings 32 of the bearing 19, see figure 2, 3.

Further, the remains of the lubricant through the blind channels 28, 29 in the covers 14, 15 and the channels in the spacer washer 18 fall into the space between the paired cuffs 16, 17.

When the excess air pressure in the pillow increases, see FIGS. 5, 6, 7, node E and node D, exhaust compressed air and residual waste lubricant exit the bearing cavity through covers 14, 15 through channels 28, 26, 27, 29 into the atmosphere, as well as through a gap 33, formed between the sealing edge of the outer cuff 16 and the contacting surface of the roll 23, in the mode of increased pressure of compressed air in the pillow 10, 11.

The output of compressed air and residual lubricant used to lubricate and cool the cuffs 16, 17 and the necks of the rolls 23, as well as to create an air barrier between the cavity of the cushion 10, 11 and the environment, creating a barrier to pollution and cutting fluids.

The lubricating oil-air mixture entering the bearing cavity through channels 12, 13, through nozzles 22 and hole 30, creates excessive pressure inside the bearing cavity. A stream of compressed air transfers the oil film along the surfaces 31 to the blind channels 28 and, falling into the space between the cuffs 16, 17, through the channels 26 forms an air barrier. At pressures before the formation of a gap 33, the exhaust air enters the atmosphere through channels 27, 29. With increasing pressure in the bearing cavity and the formation of a gap 33, the remaining compressed air and lubricant are discharged into the atmosphere, while the cuffs 16, 17 and the roll journal 23 are lubricated and cooled. The creation of an air barrier in the bearing assemblies is an additional sealing factor.

Description of the lubrication method for bearing assemblies

The oil-air mixture is supplied through the openings 30, nozzles 22 at a rate directly proportional to the air pressure in the oil-air line. The optimal mode of formation of an elastohydrodynamic oil film occurs at the exit speeds of the air-oil mixture from the channels 30, which form the laminar flow of the oil-air film, therefore, at speeds above the optimum value, the flow is turbulized, drops are separated and oil mist forms, which is undesirable during the lubrication process. On Fig given an example of a specific implementation of the method of supplying the air-oil mixture through the holes 30. In the embodiment of the node G, Fig, two holes are shown oriented in opposite directions with an angle of inclination from 0 to 17 degrees. to the bearing axis. In this embodiment, the formation of an elastohydrodynamic film occurs, which allows to produce the optimal lubrication mode (modes of the technological process of lubrication are an object of know-how).

The optimal size of a continuous elastohydrodynamic flow film formed during the lubrication process with a thickness of 5-50 μm, which ensures, including at peak loads, optimal lubrication modes and separation of contacting surfaces, as well as the amount of lubricant supplied, is determined by calculation, depending on the size of the bearings, speed rotation. Research and operating experience have confirmed the optimal modes and values characterizing the claimed method of lubrication. O = 0.00005 DW cm ³ \ hour, where O is the consumption of lubricant; D is the diameter of the bearing; B - bearing width (calculated and experimentally selected values in each specific bearing unit);

An example of a specific implementation (illustration Fig.8)

Depending on the number of holes 30 nozzles 22, from the angle of their inclination to the treadmills 31 of the outer rings 32 of the bearing 19, lubricant is supplied in different versions at angles from 0 to 90 degrees. to the bearing axis. This is the range that allows for optimal distribution of grease along the bearing's inner treadmill.

The optimal distribution of lubricant occurs in the case of the orientation of the hole 30 parallel to the rolling surfaces of the outer rings 31. When the angle is increased to 90 degrees. there is an increased consumption of lubricant and air due to the separation of the oil film from the surface 31 and due to the need to transfer energy costs for the formation of coarse droplets and transferring them to the surface of the separator.

At an angle of 0, an option with holes directed in diametrically opposite directions along the axis of the bearing is an option when the bearing is thoroughly blown through the air-oil mixture and the grease residue is sent directly to the bearing seals. In a variant of the declared values of the angle greater than 0, but less than 90 degrees. it is necessary to apply an increased consumption of lubricant to the treadmill of the inner ring of the bearing, more effectively lubricate the bearing itself, and the remaining lubricant is used to lubricate the seals (sealing material), which along with the declared distinctive means also provide sealing of the outer surface of the bearing with the inner surface of the pillows.

In a variant: angle of 90 degrees. lubricate directly onto the spacer plate 18, through which grease is distributed on both sides of the bearing.

The foregoing allows us to conclude that the ideal lubrication process occurs in the range of the optimal angle from 0 deg. to the angle of inclination of the channels 30, equal to the angles of inclination of the rolling surfaces of the outer rings, i.e. equal to the angle of inclination of the guide roller. In this embodiment, the lubricant runs parallel to the treadmills of the outer rings, pos.31.

The proposed lubrication system creates such friction conditions that the contacting surfaces do not touch each other even at peak loads, but remain separated along the contacting surfaces by an elastohydrodynamic film, and friction occurs between the layers of the lubricant. In addition, the bearing surfaces are sealed from the environment and lubricated constantly with clean, fresh “cold” lubricant without contamination, therefore, the bearing mainly provides a fluid friction mode and eliminates abrasion, as a result of which the bearing life is increased by 3–10 times or more, increases the durability of the necks of the roll, and hence the quality of the rental.

- The lubricant does not flow out of the bearing, but is applied as much as necessary to form an elastohydrodynamic film and replenish its supply, therefore, the consumption of lubricants is reduced by 20–25 times relative to the grease, which requires hundreds of tons per rolling mill per year;

- reduced power consumption in the liquid mode of friction.

The economic efficiency of using the lubrication system of the bearing assemblies of the roller bearings of the rolling stand with an oil-air film on one pair of rollers per year is from 60 to 100 thousand US dollars, depending on the dimensions of the bearings and working conditions. In addition, the culture of production is increasing, and most importantly, the environmental problem has been solved: pollution of the environment: land, water and air is eliminated.

Copyright advertising (State Registration Certificate PA No. 4268 dated 05/21/2001) confirmed the need for domestic and foreign consumers to use centralized lubrication systems in extreme conditions (high temperature, high dust and pollution, extreme loads or rotation speeds - speed coefficient up to 1.8 × 106 min - 1 mm), which increases the bearing life by an order of magnitude, i.e. 8 ÷ 12 times, reduces lubricant consumption by 30 ÷ 50 times.

Claims (4)

1. A centralized automated lubrication system for the bearing assemblies of the roller bearings of the rolling stand with an oil-air film, containing a lubricating station with liquid lubricant, an air preparation unit, oil-air feeders, a control panel, monitoring and signaling devices, lubricant pipelines, compressed air and oil-air pipelines, upper pillows, bottom, with lubricant supply channels, with covers, twin cuffs separated by a spacer washer, with bearing, in distance the nozzles of which are mounted on nozzles of the roll neck, characterized in that the outer surface of the bearing is sealed with the inner surface of the pillows, and in the spacer washer installed between the cuffs, in its upper and lower parts channels are made connecting blind channels made in the pillow covers, and a cavity of pillows with the external environment, and nozzles installed in the spacer rings are made with holes directed to diametrically opposite sides along the axis of the bearing or at an angle from 0 to 90 ° to the running horns outer bearing rings. 2. The centralized automated lubrication system of the bearing assemblies of the roller bearings of the rolling stand with an oil-air film according to claim 1, characterized in that the sealing edge of the outer cuff is directed towards the external environment and is installed in such a way that it forms with contacting pressure air in the pillow the surface of the roll is a gap for the exhaust air and lubricant residues. 3. A method of lubricating the bearing assemblies of the roller bearings of a rolling stand with an air-oil film, including dosing of the lubricant, mixing with compressed air in the oil-air feeders and supplying the mixture to the oil-air pipelines, the subsequent supply of the oil-air mixture through nozzles to the racetracks of the outer rings of the bearing and the discharge of the used lubricant into environment, characterized in that the flow of air-oil mixture through the nozzle openings is carried out with a flow rate, in direct proportion the pressure of the air supplied to the oil-air pipeline with the formation of a continuous elastohydrodynamic flowing film with a thickness of 5-50 μm, which ensures, including at peak loads, optimal lubrication modes and separation of the contacting surfaces, and the output of compressed air and residual waste lubricant from the bearing cavity into the environment is carried out through the channels in the spacer washer and through a gap formed between the sealing edge of the outer cuff and the contact surface of the roll. 4. The method of lubricating the bearing assemblies of the roller bearings of a rolling stand with an oil-air film according to claim 3, characterized in that the output of compressed air and residual waste lubricant is used to lubricate and cool the cuffs and necks of the rolls, as well as to create an air barrier between the pillow cavity and the surrounding environment, creating a barrier to pollution and cutting fluids.

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