JP2002228007A - Sealing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing apparatus for a roll of a rolling mill capable of preventing occurrence of chattering noise at an elastic lip caused by depressurization, with simple structure. SOLUTION: In the sealing apparatus, inner and outer ring member 2, 3 are arranged inside and outside in a diameter direction, respectively, and an annular space between the inner and outer ring members are partitioned in an axial direction. The apparatus is formed of a seal ring 10. The seal ring 10 is constituted by attaching an axial lip 13 to cover the periphery of an annular core metal 11 attached to one of the inner and outer ring members, and the axial lip 13 is brought into contact with a portion disposed to the other of the inner and outer ring members along the diameter direction. A regulating means 14 is disposed to the axial lip 13 for regulating movement of the axial lip in an opening direction of the axial lip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for providing a sealing function in, for example, a bearing device for supporting a rolling roll under heavy load.

[0002]

2. Description of the Related Art Conventionally, as a sealing device used for a bearing device of a rolling mill roll such as a backup roll, a sealing device having a structure as shown in FIG. 4A has been proposed.

[0003] Originally, a dust seal was not provided as a sealing device on a rolling mill roll. However, since oil mist for lubricating the roll is easily released from the inside, the atmosphere of the oil mist adversely affects the health of workers. In consideration of this, in recent years, dust seals have come to be attached as environmental measures.

This dust seal is composed of an annular core metal and an axial lip formed by vulcanizing and bonding rubber to the annular core metal so as to extend in the axial direction, and the axial lip slides on a mating member. This prevents oil mist from flowing out of the sealed space and intrusion of water and dust from the outside into the inside.

[0005]

The axial lip is lubricated with oil mist inside the sealed space. However, when the internal pressure of the sealed space increases during operation, the axial lip is reduced. In addition, a function to release the high-pressure gas to the outside by opening the axial lip by the pressure was required.

However, when the axial lip is opened due to an increase in the internal pressure, the lip vibrates due to a hunting phenomenon to generate chattering noise (unusual noise), which is a problem for the operator.

In view of the above, an improved dust seal 10 as shown in FIG. 4A has been proposed as shown in FIG. 4B. That is, a hole 18 communicating with the inside and outside is formed in the axial lip 13 so that the high-pressure gas can escape without opening the axial lip 13, and the high-pressure gas is allowed to escape to the outside through the hole.

However, when the hole 18 is provided in the axial lip 13 as described above, water or dust may enter the bearing device or the like from the outside through the hole, which may adversely affect the rotation of the roll.

Further, since a process for providing the holes 18 is necessary, there is another problem that the manufacturing process cannot be simplified.

The present invention has been made in view of the above circumstances, and has as its object to provide a sealing device that can eliminate the generation of abnormal noise at an elastic lip due to pressure release with a simple structure.

[0011]

According to a first aspect of the present invention, there is provided a sealing device which axially partitions an opposed annular space between inner and outer ring members arranged inside and outside in a radial direction, wherein one of the above members is provided. A seal ring having an axial lip attached to the peripheral edge of the annular core metal attached to the remaining member along the radial direction provided on the other member side in the axial direction, in the opening direction of the axial lip. Characterized in that it has a regulating means for regulating the movement of the object.

According to the first sealing device of the present invention, when the pressure in the sealed space is increased and the axial lip is opened to release the high-pressure gas to the outside, the movement of the axial lip in the opening direction is regulated by the regulating means. Therefore, it is possible to suppress occurrence of a hunting phenomenon due to excessive swinging of the axial lip and occurrence of an unjust chattering noise (abnormal noise).

That is, the position of the swing fulcrum when the axial lip is moved in the opening direction by the restricting means moves closer to the tip from the base position of the axial lip as compared with the related art, so that the axial lip is less likely to tremble and chatter. Is suppressed.

Further, since the axial lip can be supported by the regulating means toward the side where the axial lip slides,
The pressure resistance by the axial lip can be increased.

A second sealing device according to the present invention is a sealing device which axially partitions an opposed annular space between inner and outer ring members arranged inside and outside in a radial direction, wherein an inner peripheral edge of an annular core bar attached to the outer ring member. A restricting means for restricting movement of the axial lip in the opening direction, comprising a seal ring having an axial lip attached to a portion extending in the radial direction provided on the inner ring member side, the axial lip being brought into contact with the axial direction. It is characterized by having.

According to the second sealing device of the present invention, when the pressure in the sealed space is increased and the axial lip is opened to release the high-pressure gas to the outside, the movement of the axial lip in the opening direction is restricted by the restricting means. Therefore, it is possible to suppress occurrence of a hunting phenomenon due to excessive swinging of the axial lip and occurrence of an unjust chattering noise (abnormal noise).

That is, the swing fulcrum position when moving in the opening direction of the axial lip by the restricting means moves closer to the tip from the base position of the axial lip as compared with the conventional case, so that the axial lip is less likely to tremble and chatter. Is suppressed.

A third sealing device according to the present invention is a sealing device for axially partitioning opposed annular spaces of inner and outer ring members arranged inside and outside in a radial direction, wherein the slinger is attached to the inner ring member, and the outer ring member is It becomes a combined seal with a seal ring attached to the outer ring member, the seal ring, the inner peripheral edge of the annular core bar attached to the outer ring member, an axial lip that is brought into axial contact with a portion along the radial direction of the slinger. The axial lip has a restricting means for restricting movement of the axial lip in the opening direction.

According to the third sealing device of the present invention, when the pressure in the sealed space increases and the axial lip opens to release the high-pressure gas to the outside, the movement of the axial lip in the opening direction is restricted by the restricting means. Therefore, it is possible to suppress occurrence of a hunting phenomenon due to excessive swinging of the axial lip and occurrence of an unjust chattering noise (abnormal noise).

That is, the position of the swing fulcrum when the axial lip is moved in the opening direction by the restricting means moves closer to the tip from the base position of the axial lip as compared with the related art, so that the axial lip is less likely to tremble and chatter. Is suppressed.

According to a fourth sealing device of the present invention, in the second or third sealing device, the restricting means is a coil spring which is fitted and mounted in an opposed annular space between the annular cored bar of the seal ring and the axial lip. It is characterized by the following.

According to the fourth sealing device of the present invention, since the movement of the axial lip to the opening side is regulated by the coil spring, when the pressure in the sealed space increases, the axial lip opens to release the high-pressure gas to the outside. At the same time, the undue vibration of the axial lip is suppressed and chattering noise is suppressed, and the coil spring can be elastically deformed. It is possible to mount a spring. In addition, since the generation of abnormal noise can be suppressed by a simple process of arranging the coil spring so as to contact the side surface on the opening side with respect to the axial lip, it is easier than providing a hole in the axial lip as in the conventional case. Can be manufactured.

According to a fifth sealing device of the present invention, in the fourth sealing device, the coil spring as the restricting means is fitted and mounted in a diameter-expanded state that generates a radially inward elastic restoring force. Features.

According to the fifth sealing device of the present invention, when the coil spring is mounted on the axial lip, the coil spring has a reduced diameter. The coil lip does not fall off from the axial lip even if some external force is applied during work such as mounting the ring in the sealed position, and the axial lip opens because the coil spring can be elastically deformed in the radial direction Even when the pressure at which the high-pressure gas escapes changes, the restricting force and the restricting position can be changed flexibly in response to the change to suppress the generation of abnormal noise with high certainty. In addition, the axial lip tends to be mounted so as to be further away from the annular core metal in the axial direction as the coil spring is elastically restored to the side where the diameter of the coil spring is reduced. Adhesion with the side member can be made high.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of a main part showing a dust seal or the like as a sealing device, and FIG. 2 is a longitudinal sectional front view showing an upper half of a backup roll in a rolling mill.

According to the illustrated example, 1 is a backup roll,
2 is a roll of the backup roll 1 (corresponding to an outer ring member), 3 is a cylindrical inner ring (corresponding to an inner ring member) as a support for supporting the roll 2, and 4 is interposed between the roll 2 and the inner ring 3. A bearing group 5 constitutes a bearing device, 5 is a support shaft, and 6 is an eccentric bush interposed between the support shaft 5 and the inner ring 3.

The lubricating oil mist can be supplied to each of the rollers 7 of the roller group 4 formed in a double row in the axial direction.
The eccentric bush 6 and the inner ring 3 are provided with four oil passages 8 in the circumferential direction for sending oil radially outward from the support shaft 5 side.

Each oil passage 8 in the eccentric bush 6 is provided with a nozzle 9 for spraying oil toward each roller 7.

A dust seal 10 as a sealing device for a bearing device constituted by the roller group 4 is provided at a position facing the outside in the axial direction of the roller group 4.

That is, as shown in FIG. 1, the dust seal 10 includes an annular core 11 made of a plate material extending in a radial direction,
A seal portion 12 formed by vulcanizing and bonding a rubber-like elastic body to the annular core 11 is formed. The seal portion 12 is integrally formed with an axial lip 13 as an elastic lip.

Note that the seal portion 12 is
Is attached to the entire surface of the side face facing the roller 7 side of the annular mandrel 11 in a state where the annular mandrel 11 is attached to the sealing position, and the thickness in the axial direction is set at a location near the radial outer end of the annular mandrel 11 The thickness part 12a thicker than the inside is formed. The protruding portion 12b integrated with the thickness portion 12a is formed so as to protrude outward from the outer peripheral edge of the annular cored bar 11. The protruding portion 12b comes into close contact with the inner peripheral surface or the like of the roll 2 when the dust seal 10 is attached to the sealing position.

The axial lip 13 is a dust seal 1
0 extends from the inner peripheral edge of the annular cored bar 11 in the axially outward and radially outward direction in a state of being mounted at the sealing position.

The annular metal core 11 of the axial lip 13
A coil spring 14 is mounted between the root portion of the ring and the annular core 11.

The coil spring 14 is formed by connecting a wire formed by winding a wire into a coil shape in a ring shape. The annular core of the axial lip 13 is expanded in a radially inwardly elastic restoring force. Root for gold 11 and annular core 1
1 and constitute a regulating means.

As shown in FIG. 2, the dust seals 10 are mounted on both ends of the roll 2 and the inner ring 3 in the axial direction, respectively. The dust seal 10 is mounted in a state where the thick portion 12a and the protruding portion 12b are in contact with the step corners of the inner peripheral surface at both ends, and then the snap ring 16 engaged with the groove 15 on the inner peripheral surface of the roll 2 is provided. As a result, the dust seal 10 is prevented from coming off, and the dust seal 10 is pressed inward in the axial direction.

Further, with the dust seal 10 mounted, a seal plate 17 forming a slinger of a metal ring is fitted to the outer peripheral surfaces of both ends of the inner race 3 in the axial direction.

The seal plate 17 has a cylindrical portion 17a fitted to the inner race 3 along the axial direction, and an inner race 3 along the radial direction.
And a flange portion 17b that substantially covers the space between the roll 2 and the seal plate 17 and the dust seal 10.

When the seal plate 17 is fixedly fitted to the inner race 3, the edge of the axial lip 13 of the dust seal 10 slides on the axially inner side surface of the flange portion 17 b of the seal plate 17. Note that the seal plate 17 fixed to the inner ring 3 corresponds to a member on the inner ring side.

With the structure of the sealing device thus constructed, the annular space between the roll 2 and the inner race 3 is partitioned in the axial direction by the dust seals 10 and 10, and the internal pressure in the roller group 4 storage space is sealed. When the axial lip 13 of the dust seal 10 rises due to operation or the like, the edge portion of the axial lip 13
7 will open apart from the flange portion 17b.

When the axial lip 13 is opened,
The high-pressure gas is released to the outside, the internal pressure is reduced to a required pressure, and the opening of the axial lip 13 is regulated by the coil spring 14. Therefore, when the high-pressure gas is discharged, the opening of the axial lip 13 swings. The axial lip 13 is also prevented from vibrating due to a hunting phenomenon or the like, and remains open (a state in which the edge is further displaced from the annular core 11 from the state of the imaginary line of the axial lip 13 in FIG. 1). The opening and closing can be performed so as to be maintained or at a slow cycle in which no abnormal noise such as chattering noise is generated.

The inventor described the dust seal (outer diameter 184 mm, inner diameter 140 m) shown in the above embodiment.
(m, lip width 7 mm), a confirmation test was performed for the presence or absence of abnormal noise.

That is, in the confirmation test, the internal pressure in the sealed space was set to 0.02 MPa to 0.06 MPa with the dust seal attached to the test jig.
Every 1 MPa, every 0.02 MPa from 0.06 MPa to 0.12 MPa, and 0.15 MPa,
When each was set to 0.2 MPa, the test was performed by confirming whether or not chattering sound was generated when the high-pressure gas (air) escaped.

As a result of the above test, escape of air was confirmed in the set range of the internal pressure, and no abnormal noise was generated.

For comparison, when the above-described confirmation test was performed on a dust seal without a coil spring, abnormal noise was already generated at an internal pressure of 0.02 MPa in the sealed space. In, it was confirmed that the abnormal noise was continuous. Even when two holes of φ2 communicating with the inside and outside of the axial lip of the dust seal in the width direction are formed in two places, generation of abnormal noise is recognized at an internal pressure of 0.1 MPa or more in the sealed space. Only when four holes were formed, no abnormal noise was generated at all the set internal pressures.

FIG. 3 shows a state in which a coil spring 14 having a smaller coil diameter than that of the above-described embodiment is mounted between the root of the axial lip 13 and the annular core 11 as a restricting means. . In this manner, the coil diameter of the coil spring 14 is changed in accordance with conditions such as the internal pressure in the sealed space, and the coil spring 14 is moved between the root of the axial lip 13 and the annular core 11. Can be placed and mounted. Further, it is possible to mount the coil spring 14 having the same specification to the axial lip 13 having somewhat different specifications such as the shape for suppressing generation of abnormal noise due to elastic lip vibration.

In the above embodiment, the coil spring is fitted and mounted between the base of the axial lip with respect to the annular core and the annular core in an expanded state in which an elastic restoring force is generated radially inward. However, the fitting may be performed in a natural state that does not generate a radially inward elastic restoring force.

In the above embodiment, the ring-shaped coil spring is shown as the restricting means. However, the cross-sectional shape is adjusted according to the shape of the ring-shaped member made of an elastic resin material or the base of the annular core metal and the elastic lip. The restricting means may be constituted by a leaf spring bent in a dogleg shape or a ring-shaped member made of a rigid material such as a steel wire. Further, as the restricting means, a projection such as a ridge projecting toward the annular core may be provided on a surface of the base of the elastic lip facing the annular core. In this case, when the elastic lip is opened, the protrusion is restricted from contacting the annular core bar, thereby suppressing the vibration of the elastic lip.

In the above embodiment, the dust seal is provided on the roll side, and the elastic lip of the dust seal is slid on the inner ring side as a support. On the contrary, the dust seal is provided on the support side. The elastic lip of the dust seal may be configured to slide on the roll side.

In the above embodiment, the sealing device of the present invention is applied to the rolling bearing device of the rolling mill.
It is not limited to this.

[0051]

According to the present invention, when the axial lip opens when the pressure in the sealed space increases and the high-pressure gas escapes to the outside, the movement of the axial lip in the opening direction is regulated by the regulating means. It is possible to suppress the occurrence of a hunting phenomenon due to excessive swinging of the axial lip and an occurrence of an unjust chattering noise (abnormal noise).

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a main part such as a dust seal in FIG. 1;

FIG. 2 is a longitudinal sectional front view showing an upper half of a backup roller of a rolling mill.

FIG. 3 is a longitudinal sectional view showing a main part of a dust seal of another specification.

FIG. 4 is a longitudinal sectional view showing a main part of two types of conventional dust seals.

[Explanation of symbols]

 2 Roll (outer ring member) 3 Inner ring (inner ring member) 10 Dust seal 11 Ring core 13 Axial lip 14 Coil spring (regulator, elastic ring)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshihiro Nakagawa 39-Nishino, Kasagi, Aizumi-cho, Itano-gun, Tokushima Pref.

Claims (5)

[Claims] 1. A sealing device for axially partitioning opposed annular spaces of inner and outer ring members arranged inward and outward in a radial direction, the sealing device comprising: A seal ring having an axial lip attached to a portion along the radial direction provided on the member side and having an axial lip applied thereto, and having a restricting means for restricting movement of the axial lip in an opening direction. A sealing device characterized by the above-mentioned. 2. A sealing device for axially partitioning opposed annular spaces of inner and outer ring members arranged radially inward and outward, provided at an inner peripheral edge of an annular core bar attached to the outer ring member on the inner ring member side. A sealing ring having an axial lip attached to a portion extending radially outward from the axial direction, and having a restricting means for restricting movement of the axial lip in the opening direction. Characteristic sealing device. 3. A sealing device for partitioning, in the axial direction, opposed annular spaces of inner and outer ring members arranged inside and outside in a radial direction, wherein a combination of a slinger attached to the inner ring member and a seal ring attached to the outer ring member. The seal ring, the inner peripheral edge of the annular core bar attached to the outer ring member, the axial lip is attached to a portion along the radial direction of the slinger, is applied to the axial lip, A sealing device comprising a regulating means for regulating movement of the axial lip in an opening direction. 4. The sealing device according to claim 2, wherein the restricting means is a coil spring which is fitted and mounted in an annular space between the annular cored bar of the seal ring and the axial lip. And sealing device. 5. The sealing device according to claim 4, wherein the coil spring as the restricting means is fitted and mounted in an expanded state in which a radially inward elastic restoring force is generated. Sealing device.