JPH0513003B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a sealing mechanism for a bearing part of a rolling mill roll, etc., in which cooling water is poured while continuously supplying lubricating oil like a rolling mill roll shaft. It effectively forms a substantially non-contact seal for bearing parts that require high-speed rotation, eliminates or reduces the pressure of the seal material against the rotating shaft, and prevents deterioration or wear of the seal material due to high-speed rotation and the accompanying lubricating oil. The present invention aims to provide a sealing mechanism that sufficiently reduces leakage of cooling water or intrusion of cooling water.

(Industrial Application Field) A sealing mechanism for bearings used under conditions such as rolling mill roll shafts, where lubricating oil is constantly supplied and cooling water is added from the outside.

(Prior Art) In rolling mill roll bearings, it is necessary to continuously circulate lubricating oil supplied from the journal, and in actual operating conditions, the bearings are constantly covered with water and other cooling fluids. Impact of solids such as oxides, metal chips, metal lumps or fragments,
You are in an environment where intrusions are repeated. Therefore, it is necessary to provide an effective sealing mechanism between the bearing chock and the rotating part of the rolling mill roll. It's like this. That is, a sealing material 31 that rotates together with the rolling mill roll 30 is attached to an inner ring 32 or the like, and contact sealing portions 31a to 31d with respect to the retainer 33 are appropriately formed to prevent leakage of lubricating oil with the inner sealing portions 31a and 31b.
Further, the seal portions 31c, 31d, etc. are designed to prevent the intrusion of cooling water, oxides, etc.

(Problems to be Solved by the Invention) In the conventional device as described above, the sealing material 31 rotates together with the roll 30, and each sealing part contacts and seals a fixed part, and the roll 30 has a bearing. Since it has a certain gap between it and the other members and rotates eccentrically, the gap expands and contracts as it seals, resulting in a very imperfect seal. In other words, the normal design gap in such cases is about 1 to 2 mm, but as the bearing wears out, it is common to use a gap of 3 to 4 mm. This appears as expansion and contraction due to eccentric rotation.
Therefore, in order to absorb such a gap, each seal manufacturer creates and installs a sealing material with an outer diameter 5 to 6 mm larger in radius than the inner diameter of the seal part of the end retainer. Due to the recent demand for high productivity, rolling mill rolls such as those mentioned above have a maximum speed of 300 rpm or more and a circumferential speed of 20 m/min, for example, in hot rolling finishing mills.
It will be used under conditions such as sec or more,
Such high-speed rotation naturally increases the number of contractions and expansions of the seal portion as described above, making it impossible for the seal material to smoothly follow the conditions of large dimensions as described above, and causing problems with the seal material. A so-called open state (opening of the seal) between the retainer and the like
occurs. Such an open state causes lubricating oil to flow out or cooling water or oxides to enter through the resulting gap, which is not desirable in any case.

If the outside diameter of the sealing material is further increased and the tightness of the seal is increased, frictional heat will be generated between the end retainer and the sealing material at the seal sliding part, which should prevent the opening phenomenon described above. The occurrence of this phenomenon increases, and the sliding part of the sealing material changes and deteriorates, and the expanding and contracting action against eccentricity during roll rotation becomes insufficient, resulting in an increased occurrence of the opening phenomenon, and as mentioned above, the lubricating oil deteriorates. Leakage, ingress of cooling water, oxides, etc. will occur. Changes in quality and deterioration of the sliding parts of the sealing material mentioned above include increased hardness (for example, 90 degrees or more) and the occurrence of cracks (burning cracks) on the outer periphery. It is extremely difficult to obtain a preferable sealing mechanism because it induces the opening phenomenon and makes it difficult to obtain an appropriate prevention result.

Therefore, in the conventional rolling mill as described above, for example, in the case of a 6-stand rolling mill, the amount of lubricating oil lost reaches 4,000 to 8,000 units per month, and it is not economical to drain such lubricating oil into the scale pit. This results in a large amount of loss, and requires various lubricant oil recovery and cooling water purification treatments, which inevitably increases equipment and treatment costs.

"Structure of the Invention" (Means for Solving the Problems) A sealing material attached to an inner ring is interposed between the end retainer and the rotating shaft to seal the lubricating oil supplied between the bearing and the rotating shaft. In addition, a scale seal is provided between the end retainer and the rotating shaft, and a scale seal is provided between the intermediate portion of the inner ring and the end face of the rotating shaft. A primary drain seal is provided at the inner ring, and an oil drain seal and a secondary drain seal are installed between the base end of the inner ring and the rotating shaft journal, and an oil drain lip formed at the free end of the oil drain seal is curved. At the same time, the oil draining lip is covered with an oil dripping nose formed on the end retainer, and the draining lip formed on the free end side of the secondary draining seal is covered with a draining head formed on the end retainer, and the oil dripping nose is covered with the oil dripping nose formed on the end retainer. 1. A sealing mechanism for a bearing part of a rolling mill roll, etc., characterized in that the lip is formed with a curved surface that scatters water propagated by rotational centrifugal force away from the draining head.

(Function) The scale seal provided between the end retainer and the rotating shaft prevents scale and other solid matter from entering the bearing from the outside, and also eliminates most of the cooling water from entering between the rotating members. .

By providing a primary water drain seal between the intermediate portion of the inner ring and the end face of the rotating shaft, moisture that has entered from the scale seal portion is primarily prevented from entering the bearing portion.

An oil drain seal provided between the base end of the inner ring and the rotary shaft journal prevents lubricating oil from leaking, and a secondary water drain seal provided in this area prevents moisture from further entering from the primary seal portion. prevent. By bending the oil cutting lip formed on the free end side of the oil cutting seal and covering the oil cutting lip with an oil dripping nose provided on the end retainer, which is a fixed member, the oil cutting seal, which is a rotating member, and the end A substantially non-contact lubricating oil sealing mechanism is formed between the retainers.

A draining lip formed at the free end of the secondary draining seal as the rotating member described above is covered by a draining head formed on the end retainer, and water propagated to the draining lip by rotational centrifugal force is separated from the draining head. By forming the curved surface that causes the water to scatter, a substantially non-contact water sealing mechanism similar to that described above is formed between the secondary water draining seal, which is a rotating member, and the end retainer, which is a fixed member.

(Example) To explain the invention according to the present invention more specifically, in the present invention, regarding this kind of rolling mill roll shaft seal, as mentioned above, the tension force on the sealing material generates sliding heat. However, in view of the fact that this may actually lead to performance deterioration and an increase in the occurrence of gapping phenomena, the process of lubricating oil leakage and cooling water intrusion has been carefully examined, and basically, oil and water draining methods have been followed, and key parts have been removed. By using a non-contact system with the rotating parts, we succeeded in preventing lubricant oil from flowing out of the shaft and cooling water and oxides from entering the shaft, as described above. That is, to explain the specific configuration shown in the drawings, a seal inner ring 2 is used between a roll 10 as a rotating member and an end retainer 1 as a fixed member, and a primary drain seal 3, a secondary drain seal 4, and an oil drain seal are used. Seal 5 is attached.
The retainer 1 described above is equipped with a scale seal 6 for the end face of the roll 10, and has a water drain hole 11 on the outside near the scale seal attachment part.
is formed, and an intrusion water receiving portion 17 is formed therein, and the above-mentioned oil drain seal 5 and secondary drain seal 4 are attached to the roller journal 7 by fixing means 13 and 14, and the secondary drain seal 4 is An expansion control ring 15 is attached to the base, and a drain lip 4 is attached to the tip side of the secondary drain seal 4.
1 is formed and joined to the side surface of the drain support portion 18 of the retainer 1 described above. Furthermore, 2 like this
The middle part of the seal inner ring 2, whose base is attached to the tip side of the next draining seal 4, extends along the step end face of the roll 10, and its outer end extends into the above-mentioned infiltrated water receiving part 17. As mentioned above, the primary draining seal 3 is provided along the side surface of the stepped portion of the roll 10 to seal off the cooling water that enters from the scale seal 6 portion.

The retainer 1 according to the present invention is as described above.
An oil dripping nose 12 and a draining head 16 are provided in the oil dripping nose 12, the oil dripping nose 12 is formed at a position covering the branch lips 5a and 5b of the oil draining seal 5, and the draining head 16 is connected to the secondary draining seal described above. The draining lip 23 part is formed to protrude slightly to cover the draining lip 23 part at 4, and the draining lip 23 part is formed with a support protrusion 24 that joins to the side surface of the draining head 16, so that the draining lip 23 part is always connected to the draining head 16. It is designed to hold it in the correct position. A gap 9 as described above is formed between the roll journal 7 and the bearing metal 8.
As mentioned above, lubricating oil is press-fitted from the gap 9, and there is an oil drain seal 5 in front of the gap 9.
An oil chamber 19 is provided between the lip portion 5a and the bearing metal 8.
An oil discharge passage 26 is formed in the oil chamber 19 in the direction of the bearing metal 8.

That is, the lubricating oil discharged from the gap 9 into the oil chamber 19 as described above is guided to the oil drain seal 5, and most of it is passed through the oil dripping nozzle 12 in the area above the roll 10 as shown in FIG. It is guided downward and falls into the second oil chamber 26 in an area below the roll 10 as shown in FIG. Therefore, there is almost no oil leakage to the end retainer 1 side, and there is no need to seal the inner diameter surface of the retainer 1. The oil drain seal 5 can achieve the purpose of sealing lubricating oil in a substantially non-contact manner.

It is clear that a large amount of cooling water is injected into the roll 10 and its bearing part, but most of the cooling water is removed by the scale seal 6 and the water enters from this part. The cooling water is supplied to the 1 provided between the inner ring 2 and the end face of the roll.
The cooling water sealed by the secondary draining seal 3 and blocked by the seal portion 3a where the primary draining seal 3 extends toward the scale seal 6 side flows into the roll 1.
The centrifugal force caused by the zero rotation causes the scale seal 6 to be discharged to the outside. The cooling water that could not be prevented by the above-mentioned primary drain seal 3 overflows the end of the inner ring 2 and flows into the intrusion water receiving part 1.
However, the water that has entered the receiving portion 17 in this way is discharged to the outside from the drain hole 11 in the retainer 1. Some of the water in the receiving portion 17 further enters the roll 10 in the axial direction, but the water that has entered in this way is blocked by the secondary drainage seal 4, and centrifugal force due to rotation is generated between the inner ring 2 and the seal 4. The draining lip 2 is guided toward the outer circumference by the action.
3, the liquid is scattered toward the inner surface of the inner ring 3, and guided along the inner surface toward the drain hole 11. In any case, the draining lip 23 of the secondary draining seal 4 and the draining head 1 of the retainer 1
The cooling water that penetrates into the inner diameter part of the retainer 1 beyond the 6th part is properly discharged under the rotation conditions of the water draining seal 4 and the inner ring 2, and this water draining is also an effective seal in a substantially non-contact manner. can be done.

"Effects of the Invention" According to the present invention as explained above, bearing sealing can be effectively achieved in a rolling roll of this type under conditions where lubricating oil is continuously supplied and cooling water is sufficiently added in a non-contact manner. Therefore, it eliminates the need for a seal material with a particularly large diameter and a seal with increased tension, thereby preventing the deterioration and deterioration of the seal material, and further reducing the excessive use of lubricating oil. This invention can avoid leakage and carry out operations that are advantageous in terms of facility operation, and is an invention that has great industrial effects.

[Brief explanation of the drawing]

The drawings show the technical contents of the present invention, and FIG. 1 is a cross-sectional view showing the upper half of a rotating shaft bearing equipped with a sealing mechanism according to the present invention, and FIG. 2 shows the general relationship thereof. The sectional views shown in FIG. 3 are sectional views showing some examples of conventional bearing seal mechanisms of this type. In these drawings, 1 is an end retainer, 2 is a seal inner ring, 3 is a primary drain seal, 4 is a secondary drain seal, 5 is an oil drain seal, 5a and 5b are branch lips thereof, 6 is a scale seal, 7 is a roll journal, 8 is a bearing metal, 9 is a gap, 10 is a roll, 11 is a drain hole, 12 is an oil dripping nose, 13 and 14 are fixing means, 15 is an expansion ring, 16 is a drain head, 1
Reference numeral 7 designates an intrusion water receiving portion, 18 a drain support portion, 19 an oil chamber, 20 a primary water chamber, 21 a secondary water chamber, and 23 a drain lip.

Claims (1)

[Claims] 1 A sealing material attached to the inner ring is interposed between the end retainer and the rotating shaft to seal the lubricating oil supplied between the bearing part and the rotating shaft, and also to seal the cooling water supplied to the rotating shaft part. In a device designed to prevent intrusion, a scale seal is provided between the end retainer and the rotating shaft, and a primary drain seal is provided between the intermediate portion of the inner ring and the end face of the rotating shaft, and An oil drain seal and a secondary water drain seal are installed between the base end and the rotary shaft journal, an oil drain lip formed at the free end of the oil drain seal is curved, and the oil drain lip is formed on the end retainer. The oil dripping nose covers the oil dripping nose, and the draining lip formed on the free end side of the secondary draining seal is covered by the draining head formed on the end retainer. A sealing mechanism for a bearing part of a rolling mill roll, etc., characterized by forming a curved surface that scatters away from a draining head.