JPH034404Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sealing device for a roll neck used in a bearing portion of a roll for a rolling mill.

(Prior Art) A specially designed roll neck sealing device is used in rolling mill bearings to prevent internal lubricant from leaking and to prevent cooling water and scale from entering.

What is shown in FIG. 2 is an example of this type of sealing device for a roll neck that has been used in the past.
and a second seal member 20 that prevents cooling water and scale from entering, and the first seal member 15
a first main body 16 fixed to the roll shaft 1;
A first seal lip 1 extends from the first main body 15 toward the inner side of the bearing and slides on the inner circumferential surface of the seal end plate 3 provided on the bearing box side.
7 and a second seal lip 18, and the second seal member 20 has a second seal lip 18 fixed to the roll shaft 1.
A third seal lip 22 extends outward from the second body 21 toward the outside of the bearing box and slides on the inner circumferential surface of the seal end plate 3.

What is shown with reference numeral 2 in the figure is a sleeve that presses the first main body 16 and the second main body 21 to press them against the tapered portion of the roll shaft 1.

(Problems to be Solved by the Invention) In the conventional roll neck sealing device described above, the sealing device slides on the inner circumferential surface of the seal end plate 3 and provides a sealing effect against internal lubricant, cooling water, scale, etc. 1 seal lip 17, 2nd
the third seal lip 18 and the third seal lip 22
are extended directly from the first body 16 and the second body 21, so that when eccentricity occurs between the roll shaft 1 and the seal end plate 3, each seal lip 17, 18, 22
The seal end plate 3 has poor conformability to the inner circumferential surface of the seal end plate 3, and there is a strong possibility that each seal lip may become deformed, sag, or harden within a short period of time, degrading the sealing function.

The present invention solves the above-mentioned problems and presents a structure of a sealing device for a roll neck that has excellent followability against eccentricity between the roll shaft and the seal end plate and can maintain a normal sealing function over a long period of time. The purpose is to

(Means for Solving the Problems) In consideration of the problems in the roll neck sealing device according to the above-mentioned conventional technology, the present invention provides a main body fixed to the roll shaft with a bellows extending substantially in the axial direction. A reinforcing ring is embedded in the end of the bellows, and a first seal lip and a second seal lip are provided that extend from the end of the bellows toward the bearing side and in the opposite direction and sealingly slide on the inner peripheral surface of the seal end plate, and further , an annular projection is provided between both seal lips.

(Function) In the roll neck sealing device with the above-described configuration, the bellows extending approximately in the axial direction from the main body fixed to the roll shaft self-align when eccentricity occurs between the roll shaft and the seal end plate. Due to its deformability, it is possible to maintain a concentric state between each seal lip and the inner peripheral surface of the seal end plate, and its rigidity allows the reinforcing ring embedded in the end of the bellows to absorb centrifugal force due to rotation. Furthermore, the annular protrusion attached to the outside of the end of the bellows is guided by the inner peripheral surface of the seal end plate to prevent the inner peripheral surface of the seal end plate and each seal lip from expanding concentrically. Persist the state.

(Embodiment) In the embodiment shown in FIG. 1, a main body 4 pushed by a sleeve 2 and fixed to a roll shaft 1 has a flinger 10 extending outward toward the bearing box and a bellow 5 extending in the opposite direction. A reinforcing ring 6 having a substantially snake-eye shape is embedded inside a portion that extends in the radial direction and is connected to the end of the bellows 5, and the bearing is inserted from the outer end of the portion where the reinforcing ring 6 is embedded. A first seal lip 7 extends toward the inside of the box and slides on the inner peripheral surface of the seal end plate 3 to prevent leakage of internal lubricant, and a first seal lip 7 extends in the opposite direction and slides on the inner peripheral surface of the seal end plate 3. A second seal lip 8 is attached to the second seal lip 8 to prevent the intrusion of cooling water, scale, etc. by sliding on the second seal lip 8, and an annular projection 9 is provided between the seal lips 7 and 8.
is attached.

When eccentricity occurs between the roll shaft 1 and the seal end plate 3 of the mechanical device equipped with the above-described embodiment, the large diameter end of the deformable bellows 5 and both seal lips supported by the bellows 5 7,8
is guided by the sliding of the annular protrusion 9 on the inner circumferential surface of the seal end plate 3 to maintain a concentric state with respect to the inner circumferential surface of the seal end plate 3, and the bellows 5 is The reinforcing ring 9 embedded in the end of the bellows 5 suppresses the expansion of the diameter of the large-diameter end and both seal lips 7, 8, and reduces the contact pressure of both seal lips 7, 8 against the inner peripheral surface of the seal end plate 3. Prevent excessive rise.

(Effects of the Invention) As described above, the roll neck sealing device of the present invention includes a main body fixed to the roll shaft, a bellow extending substantially axially from the main body and having a reinforcing ring embedded in the end thereof. Extending from the end of the bellows in both axial directions,
A first seal lip and a second seal lip that slide on the inner circumferential surface of a seal end plate attached to the bearing box side that supports the roll shaft, and a first seal lip and a second seal lip that are arranged between the two seal lips and touch the inner circumferential surface of the seal end plate. By having a structure having a sliding annular protrusion, the concentricity of both seal lips with respect to the inner circumferential surface of the seal end plate is controlled by the deformability of the bellows and the sliding of the annular protrusion with respect to the inner circumferential surface of the seal end plate. The diameter of the large-diameter end of the bellows and both seal lips is prevented from expanding due to centrifugal force due to rotation by the rigidity of the reinforcing ring embedded in the large-diameter end of the bellows. Prevents premature wear of each seal lip due to excessive increase in contact pressure against the inner peripheral surface of the seal end plate.
Good sealing performance is maintained over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of an embodiment of the present invention, and FIG. 2 is a partial sectional view of an example of a conventional roll neck sealing device. 1... Roll shaft, 2... Sleeve, 3... Seal end plate, 4... Main body, 5... Bellow,
6... Reinforcement ring, 7... First seal lip, 8...
...Second seal lip, 9...Annular projection, 10...
...Flinger, 15...First sealing member, 16
...first body, 17...first seal lip,
18...Second seal lip, 20...Second seal member, 21...Second main body, 22...Third seal lip.

Claims (1)

[Scope of utility model registration request] The roll shaft 1 is made of a rubber-like elastic material.
a main body 4 fixed to the main body 4; a bellows 5 extending substantially axially from the main body 4 and including a reinforcing ring 6 at the end;
A first seal lip 7 and a second seal lip 8 extend from the end of the bellows 5 in both axial directions and slide on the inner peripheral surface of a seal end plate 3 provided on the bearing box side that supports the roll shaft 1. , an annular projection 9 disposed between the sealing lips 7, 8.