JPH11270785A - Lubricating method and device for roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently utilize the fed lubricant secondaily by feeding lubricant and air in a two-phase flow, guiding it to a lubrication section provided on a first roller bearing, and guiding the lubricant and air discharged from the lubrication section to a lubrication section provided on a second roller bearing. SOLUTION: Oil air is guided from an oil filler port 17 on one side for lubrication at a lubrication section 8, and it is guided to an oil filler port 17A on the other side through a recovery feed pipe 20 for lubrication at a lubrication section 8A. The recovery port 19 of the lubrication section 8 on one side of a roller 14 on the front side and the feed port 17A of the lubrication section 8A on one side of a roller 14A on the rear side are connected by the recovery feed pipe 20. The front and rear are not absolute but relative, optional one of two rollers 14, 14A is set on the front side, then the other is set on the rear side. Two rollers 14, 14A are shown in this example. In case of three or more rollers, the rollers are sequenced, and the recovery port of the front roller and the feed port of the rear roller may be connected in sequence likewise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and a device for lubricating a roll bearing, and more particularly to a method and a device for lubricating a roll bearing in which a lubricating oil and a gas can be effectively used in a pneumatic lubrication system.

[0002]

2. Description of the Related Art A conventional pneumatic lubrication system is constructed as shown in FIG. 6, in which lubricating oil (oil, oil) supplied from a main unit 100 is mixed with a gas (air) in a mixer 6. In the form of a gas-liquid two-phase flow (oil air), the oil is sent from the distributor 7 through the oil supply port 17 to the lubricating part 8 which is permanently installed in the bearing 11 of the rotating body (roll) 14, for example. The sent oil is
It is discharged to the outside as it is from the seal portion 18 (the mounting portion of the oil seal, dust seal or labyrinth seal) for sealing the lubricating portion 8.

In Japanese Unexamined Patent Publication No. Hei 7-91596, the oil is not directly discharged from the lubricating portion 8 to the outside for environmental protection, and as shown in FIG.
The recovered oil is recovered from 19 through the recovery pipe 9 into the recovery tank 10, and the recovered oil is either subjected to waste oil treatment or drainage treatment together with nearby drainage.

[0004]

The oil-air lubrication system is originally applied to high-speed rotating shafts of precision machine tools and the like, and the purpose thereof is to avoid the generation of lubricating oil stirring heat by supplying a small amount of oil. At the same time, the lubricating part is cooled by the gas phase. In these applications, since the oil deteriorates remarkably, even if it is regenerated, the cost is too high, and the oil is usually discarded as described above.

[0005] This lubrication system is also applied to large-scale equipment in the field of steel and the like (roll bearings of rolling equipment, sliding parts of machines, etc.). However, there is sufficient cooling with a large amount of lubrication, so the oiling method using oil air is more effective than the purpose of preventing heat generation and cooling of the lubricating part. Applied for the purpose of preventing intrusion.

[0006] In steel facilities and the like that employ an oil-air refueling method for such a purpose, the rotation and sliding of the shaft in the lubricating portion are performed at a relatively low speed (5000 rpm or less), so that heavy loads such as precision machine tools are applied. In most cases, they are not exposed to harsh lubricating environments such as high heat. Therefore, it is considered that the lubricated oil has a low degree of weight contamination of foreign matter, and has no change in viscosity due to shearing of the oil or deterioration due to heat. For example, in lubrication of a roll bearing of a continuous casting facility to which an oil supply system as shown in FIG. 7 is applied, recovered oil from the lubricating part under the operating conditions shown in Table 1 is sufficient as shown in the same table in the investigation by the inventors. It is clean and has not lost its performance as a lubricating oil.

[0007] Nevertheless, conventionally, the oil once used for lubrication is simply collected and subjected to waste oil treatment or wastewater treatment together with the nearby wastewater, which has been a great waste.

[0008]

[Table 1]

An object of the present invention is to provide a method and an apparatus for lubricating a roll bearing which can eliminate such waste in the prior art and can secondarily and effectively utilize oil supplied by an oil-air supply system.

[0010]

The present invention provides a two-phase flow of lubricating oil and gas, which is introduced into a lubricating portion provided on one roll bearing, and then the lubricating oil and gas discharged from the lubricating portion are subjected to A method of lubricating a roll bearing (method I), which is introduced into a lubrication unit provided in a second roll bearing. Further, the present invention is a lubricating device for lubricating a plurality of roll bearings by using a two-phase flow of lubricating oil and gas, and a lubrication unit provided in each roll bearing, a lubrication port for introducing lubricating oil and gas. , A recovery port for discharging lubricating oil and gas, and a recovery oil supply pipe for connecting the recovery port of the lubrication unit provided on one roll bearing and the oil supply port of the lubrication unit provided on the second roll bearing. Roll bearing lubrication device characterized by having (device I)
It is.

The most typical mode of the present invention is a method (method Ia) or an apparatus (apparatus Ia) for connecting lubricating portions provided on bearings on both sides of a roll by a recovery oil supply pipe, or a bearing for one roll. A method (method Ib) or a device (device Ib) of connecting a lubricating portion provided to a lubricating portion provided on a bearing of an adjacent second roll by a recovery oil supply pipe. Further, the present invention is the device (device II) which is provided with a filter for filtering foreign substances in the middle of the recovery oil supply pipe in the device I.

[0012]

FIG. 1 is a schematic diagram showing an example of an apparatus Ia suitable for carrying out a method Ia. In this example, the role
14 one-side recovery port 19 (lubricating part 8 for lubricating one-side bearing 11)
And a recovery oil supply pipe 20 connecting the other side oil supply port 17A (the oil supply port of the lubrication unit 8A that lubricates the other side bearing 11A).
Is provided outside the roll 14.

FIG. 2 shows an apparatus Ia suitable for carrying out the method Ia.
It is a schematic diagram which shows the other example of. In this example, a recovery port 19 on one side and an oil supply port 17A on the other side are provided immediately inside the seal portions 18 and 18A, and a recovery oil supply pipe 20 connecting these is provided in the roll 14. FIG. 3 is a schematic diagram showing still another example of the apparatus Ia suitable for performing the method Ia. In this example, the roll 14 is fitted on the fixed shaft 21 and the collection port on one side is
A collection oil supply pipe 20 for connecting the oil supply port 19A to the oil supply port 17A on the other side is provided in the fixed shaft 21. The oil supply port 17 on one side and the recovery port 19A on the other side communicate with the outside via holes formed in the fixed shaft 21 or the fixed shaft fixing block 22 on each side.

According to the apparatus Ia illustrated in FIGS.
Oil air is introduced from the oil supply port 17 on one side to lubricate the lubrication unit 8, and is further passed through the collection oil supply pipe 20.
Method Ia of introducing lubricating part 8A into lubricating part 8A
Can be easily implemented. FIG. 4 is a schematic diagram illustrating an example of an apparatus Ib suitable for performing the method Ib. The recovery port 19 of the lubrication section 8 on one side of the front roll 14 and the oil supply port 17A of the lubrication section 8A on one side of the rear roll 14A are connected by a recovery oil supply pipe 20. Note that the front and the rear are not absolute ones, but are relative such that any one of the two is the front and the other is the rear. Further, although two rolls are shown in this example, even if the number of rolls is three or more, the rolls may be numbered in order, and the previous recovery port and the subsequent oil supply port may be sequentially connected in the same manner. Also, as a matter of course, the oil supply port on one side of the first roll (the roll that cannot be removed) is supplied with oil from the distributor 7 near the lubricating unit in FIG. Is connected to the collection pipe 9 in FIG.

According to the apparatus Ib illustrated in FIG. 4, the lubricating portions on one side of the plurality of rolls can be connected in series and the oil air can be supplied sequentially from the upstream side, so that the method Ib can be easily carried out. In addition, it is of course possible to connect non-adjacent rolls. By performing the method Ia and the method Ib singly or in combination, the lubricating oil distributed from one lubricating source (the distributor 7 on the inlet side of the lubricating unit 8 in FIG. 6 or 7) is lubricated a plurality of times. And the object of the present invention is achieved.

An oil seal is usually applied to the lubricating portion, and a part of gas forming a two-phase flow leaks from the oil seal. In order to prevent the lubrication performance of the subsequent lubricating part from deteriorating due to this leakage, keep the gas flow rate large so that absolutely more gas flows than the amount of gas leakage from the oil seal. Is good. By adopting such a configuration, the lubricating oil is transferred to the next lubricating section with relatively little loss of gas components. Specifically, since the amount of lubricating oil recovered and supplied is 70-95%, the structure of the seal and the design of the recovered oil supply pipe are appropriately devised as described below.
Lubricating and lubricating the next lubricating part by performing lubrication under the same condition (recovery rate of lubricating oil x 0.8 or more, preferably x 0.9 or more) under conditions that allow recovery to the lubrication pipe Can be.

In the gas-phase lubricating system, there is no intrusion of water or the like from the bearing portion, the cleanliness of the used lubricating oil does not deteriorate, and the amount of foreign matters is the value after filtration through a 0.8 μm membrane filter. 2 to 10 mg / 100 ml, and the particle diameter is almost 5 μm or less in most cases. Since the cleanliness is higher than the lubricating oil used in a general circulation lubricating system, even if the lubricating method according to the present invention is used, there is no hindrance to the second and subsequent lubrication. In addition, the amount of oil and gas leakage at the lubricating part differs depending on the seal configuration, but the amount necessary for lubrication of the final lubricating part is secured by estimating the amount of leakage in advance and increasing the amount of lubrication by that amount. It is easy to do.

Since the recovered oil supply pipe sends gas more easily than the gas leakage in the lubricating part, it is necessary to avoid a large pressure loss dimension. Is sufficient.
Further, when the generation of foreign matters is large and the particle diameter is large, as shown in FIG.
By using the device II in which the filter 23 is provided in the middle of the collection oil supply pipe 20 provided outside the roll in b, lubricating oil with high cleanliness can be supplied. In addition, as a filter, the thing of a sedimentation filtration type etc. are desirable in order to reduce pressure loss.

The lubricating oil used in the present invention is a general gear oil, bearing oil, or the like, and its viscosity is basically applicable to ISO VG680, and clean air or nitrogen is used as the gas.
The sealing mechanism of the lubricating part is preferably a contact type such as an oil seal or a dust seal, but a labyrinth seal can also be applied if the gas flow rate of the recovery pipe is large. In this case, the direction of the seal is selected according to the use of the lubricating part, the amount of leakage of lubricating oil and gas is predicted (approximately good), the amount is added to the amount of lubrication to the first lubrication destination, and the final lubrication part There is no problem if the necessary amount is distributed.

Further, in the above-described embodiment, the description has been given of the case where only the bearings are to be refueled. It may be.

[0021]

As described above, according to the present invention, most of the oil which has been conventionally discharged only once is discharged after being used a plurality of times, so that the oil cost can be reduced and the waste oil treatment load can be reduced. Environmental cleanup is promoted, and multiple distributors can be aggregated without impairing the conventional lubrication performance and sealing performance, and the number of refueling piping and collection piping at the refueling destination can be reduced, reducing the initial cost of the refueling system. An excellent effect is achieved in that the cost is reduced and the equipment maintenance cost is significantly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an example of an apparatus Ia suitable for performing a method Ia.

FIG. 2 is a schematic diagram showing another example of an apparatus Ia suitable for performing the method Ia.

FIG. 3 is a schematic diagram showing still another example of the apparatus Ia suitable for performing the method Ia.

FIG. 4 is a schematic view showing an example of an apparatus Ib suitable for performing the method Ib.

FIG. 5 is a schematic diagram showing an example of a device II.

FIG. 6 is an explanatory diagram of a conventional oil discharge type pneumatic lubrication system.

FIG. 7 is an explanatory diagram of a conventional pneumatic lubrication system of a simple oil recovery type.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lubricating oil tank 2 Oil supply pump 3 Oil distributor 4 Air piping 5 Air shutoff valve 5A Air pressure reducing valve 6 Mixer 7 Distributor 8 Lubricating part 9 Recovery pipe 10 Recovery tank 11 Bearing 12 Bearing box 13 Bearing box cover 14 Rotor (roll ) 15 Rotary shaft 16 Bearing holder 17 Oil filler 18 Seal part 19 Recovery port 20 Recovery oil supply pipe 21 Fixed shaft 22 Fixed shaft fixed block 23 Filter 100 Main unit

Claims (3)

[Claims] After the lubricating oil and gas are introduced into a lubricating portion provided in one roll bearing as a two-phase flow, lubricating oil and gas discharged from the lubricating portion are provided in a second roll bearing. A method of lubricating a roll bearing, wherein the method is introduced into a lubrication section. 2. A lubrication device for lubricating a plurality of roll bearings by using a two-phase flow of a lubricating oil and a gas, comprising: a lubrication port for introducing a lubricating oil and a gas into a lubricating portion provided on each roll bearing; It has a recovery port for discharging lubricating oil and gas, and has a recovery oil supply pipe that connects the recovery port of the lubrication unit provided on one roll bearing and the oil supply port of the lubrication unit provided on the second roll bearing. A lubricating device for a roll bearing, characterized in that: 3. The apparatus according to claim 2, wherein a filter for filtering foreign matter is provided in the middle of the recovery oil supply pipe.