JPH0257765A - Mechanism sealing deflection-controlled roll end - Google Patents

Abstract

PURPOSE: To obtain maximum reliability in a closing effect by forming mutually pressing and sliding face as two flat radial faces made of inelastic bodies, and forming one of these radial faces wider in a radial direction than the other. CONSTITUTION: A shell 2 is rotatably fitted to a stationary center shaft 1 through a bearing. A ring pair 14 and sections 15, 16 are therefore rotated together with the shell 2, while a seal ring 8 and parts 9-10 remain stationary. A sealing effect can be obtained by radial faces 13, 17 rotated relatively to each other. The axial motion of the seal ring 8 is generated between an elastic auxiliary seal 18 and an axial opposed face 19. The seal ring 8 further generates force of pressing the radial face 13 to the radial face 17 in cooperation with a spring ring 11 by the action of the pressure of a pressure fluid shut up in a pressure chamber, upon a radial face 20. The face 17 is wider than the face 13 and is made of hard material.

Description

Detailed Description of the Invention A. Field of Industrial Application The present invention comprises a central shaft, a shell rotatably mounted around the central shaft via a bearing, and a pressure chamber provided between the central shaft and the shell. A mechanism for sealing the end of a deflection-controlled roll having, by means of which a pressure fluid is delivered into a pressure chamber for correction or adjustment of the deflection of the shell of said roll, comprising:
and the mechanism further includes two radially outer surfaces arranged to be pressed against each other and slidable relative to each other, proximate the ends of the pressure chamber to prevent spillage of pressurized fluid to the outside of the pressure chamber. It pertains to those that have.

BACKGROUND OF THE INVENTION Deflection controlled rolls, such as those described above, have a stationary central shaft and a shell rotatably mounted therearound. A pressure chamber is defined between the shell and the central shaft, which can be pressurized by a pressure fluid for correcting or adjusting the deflection of the shell of the roll.

The pressure fluid to be delivered into the pressure chamber must be introduced into the roll, and the ends of the roll must be sealed so that the pressure within the roll remains constant and no spillage of the pressure fluid occurs. It won't happen. The reliability of the closure means or seals is such that failure of the seal can lead to an expensive and complicated process stoppage, and that replacement of the seal can be complicated, time consuming, and costly, especially for large rolls. This is particularly important as it is a process that involves

When compensating for roll deflection, a radial movement and angular change of the roll takes place at the end of the roll in the area of the seal. Therefore, the seal must be flexible in the axial direction and must have clearance in the radial direction. In rolls with large diameter shafts, the sliding rate on the sealing surfaces increases to high values, for which reason the sliding surface material must have good sliding properties. Relatively long rolls experience thermal expansion as the rolls heat up during operation, and such thermal expansion must be compensated for by seals at the roll ends.

Problems to be Solved by the Invention In the past, roll ends were sealed by radial shaft seals known as steppers. However, such seals lack reliability of operation. The reason is that it has to be manufactured from an elastic material that can cause fatigue when the roll is opened for a long time in one of its extreme positions, for example when the pressure chamber is not pressurized. . As pressurized fluid is introduced into the roll and angular changes and radial movements occur, the sealing material does not follow the movement of the body, so the seal does not seal, and a gap is formed between the seal and the facing surface; Through such a gap the pressure of the pressure medium is released. Also, such conventional seals are extremely susceptible to wear due to the soft nature of the material and the fact that sliding motion caused by rotational motion and motion caused by thermal expansion occur on the same sliding surface in a variety of different directions. . Additionally, the resilient materials of conventional seals cannot withstand the high sliding rates that occur with large diameters.

The conventional seals described above do not have the ability to seal against high pressures as required. Such high pressures are used especially in modern roll constructions. The unreliability of conventional sealing means as described is a problem of great practical importance, especially since the replacement of seals on large diameter rolls is very time consuming and therefore expensive.

26. SUMMARY OF THE INVENTION It is an object of the present invention to provide a roll end sealing mechanism which obviates the disadvantages of the prior art. This means that surfaces configured to press against each other and slide against each other,
two flat radial surfaces made of inelastic material and arranged to be pressed against each other in the axial direction, one of the radial surfaces being wider than the other in the radial direction This is achieved by a mechanism according to the invention characterized in that:

E1 Effect of the invention The main advantage of the invention is the high reliability of the sealing effect obtained;
The reason is that the surfaces that slide relative to each other can be made from the most suitable material for the purpose in each particular case, i.e. independently of the type of medium, pressure and sliding rate, for example. It is from. Wear is minimized in all cases and therefore maximum reliability is obtained. This eliminates costly replacement of seals and consequent high production losses. Another advantage is that the sealing effect can be relied upon under all circumstances, even when pressure fluid is introduced into the pressure chamber and angular changes and radial movements occur at the ends of the roll.

In the following, the invention will be explained in more detail by means of a preferred embodiment shown in the accompanying drawings, in which: FIG.

EXAMPLE FIG. 1 shows a controlled deflection roll having a central shaft 1 around which a cylindrical shell 2 is rotatably mounted in bearings. The central shaft 1 is supported by supports 3 at both ends thereof.

The shell 2 of said roll is rotated relative to the central shaft 1 by means of a gearing 4 . The drive bin for the gearing 4 is designated by the reference numeral 5. Center shaft 1 and shell 2
A pressure chamber 6 is provided between the two. Pressure fluid may be introduced into the pressure chamber 6 to correct the deflection of the shell 2 and straighten it, or to give it any other suitable contour.

Pressure fluid is introduced into the pressure chamber 6 through an inlet lower provided at one end of the roll. The deflection-controlled roll cooperates with a counterroll, not shown, to define a nip, for example in a paper machine.

What has been described above constitutes part of the prior art and therefore they will not be explained in further detail.

The mechanism according to the invention for sealing the ends of the roll is located in the area indicated by the circle in FIG.

FIG. 2 shows a general view of the arrangement according to the invention. The mechanism has a sealing ring 8 secured to the central shaft 1 by a body part 9. 1 body part 9 is fixed to the central shaft 1 by a stopper pin 10. The sealing ring 8 is secured to the body part 9 by means of axial spring means 11 and support pins 12.
is fixed to. The sealing ring 8 has a sliding ring part with a radial surface 13 serving as a sliding surface.

In FIG. 2, reference numeral 14 represents a pair of rings secured to a part 15 that is connected to the shell (not shown in FIG. 2). The counter ring 14 is attached to the part 1 by the bottle 16.
5. The counter-ring 14 has a radial surface 17 that serves as a counter-face for the radial surface 13.

As mentioned above, the shell 2 is connected to the stationary central shaft 1
is rotatably mounted via a bearing. Therefore,
The pair ring 14 and the parts 15, 16 rotate together with the shell 2, while the sealing ring 8 and the parts 9° io, il, 1
2 remains stationary. The sealing effect is obtained by the radial surfaces 13.17 rotating relative to each other.

The axial movement of the sealing ring 8 takes place between the elastic auxiliary seal 18 and the axial facing 19. The elastic auxiliary seal 18 is, for example, an O-ring.

The sealing ring 8 is furthermore a radial surface 2o on which the pressure fluid pressure confined in the pressure chamber 6 acts, cooperating with the spring ring 11 to radially move the radial surface 13. It has something that generates a pressing force against the surface 17.

During the pressurization phase, i.e. when the pressure fluid is being fed into the pressure chamber 6, a radial movement and angular change of the rolls takes place, so that one of the radial surfaces 13.17 is noticeably wider than the other. It is absolutely necessary that Such wider surface, the radial surface 17 of the counter-ring in FIG. 2, is preferably made of a harder material than the narrower surface, the radial surface of the seal ring 8 in FIG. The wear likely thereby occurs always on the narrow radial surfaces, so that grooves or other wear marks that could lead to spills do not occur on the wide radial surfaces.

Such an embodiment is not the only possibility; it is equally possible for both radial surfaces 13.17 to be made of a highly wear-resistant superhard material. In this case too, it is necessary that one radial surface be made wider than the other, so that during the radial movement both radial surfaces remain close to each other.

As already mentioned, in the embodiment of FIG. 2 the wide surface is the radial surface 17 which rotates with the shell 2 and the narrow surface is the radial surface 13 which seals and retains the crown of the tongue 8. It is. radial surfaces 13 and 174, the spring means 11 and the pressure chamber 6 via the radial surface 20, as described above.
The pressure of the pressure fluid inside and the pressure of the pressure fluid (therefore, each other) are pressed together.

Axial movement is appropriately large I/mu space 'l', main body part 9
The sliding movement defined between the auxiliary seal 1B and the axial facing 19 is corrected by means 11. .

Since the movement in this direction is slower and occurs with less frequency, the elastic auxiliary seal 18, which is protected by elastic material forces, is sufficient to protect the sliding points. have

The sealing device according to the present description can be applied to seal the high pressures of pressure fluids used in modern roll bookkeeping, since the material used is hard and does not yield under pressure, and This is because the pressing effect between the radial surfaces 13 and 17, which are pressed against each other by ν'% and which slide against each other, is determined by the pressure of the pressure fluid to be sealed.

The illustrated embodiments are in no way intended to limit the invention, which may be modified as desired within the scope of the claims. Accordingly, the arrangements according to the invention, or parts thereof, need not be exactly the same as those shown in the drawings, and other types of alternatives are possible as well.

[Brief explanation of the drawing]

FIG. 1 is a general view of a deflection-controlled roll, and FIG. 2 is a sectional view of the mechanism according to the invention. On the drawing, 1...shaft, 2...shell, 4...
Gear device, 6... Pressure chamber, 8... Seal ring, 9
...Body parts, 11...Spring means, 12...Support bin, 13.17...Radial surface, 14...Pairing ring, 18...Elastic auxiliary seal, 19...Face , 20
...Radial surface. FIG.1

Claims (6)

[Claims] (1) A mechanism for sealing the end of a deflection-controlled roll having a central shaft, a shell rotatably mounted around the central shaft via a bearing, and a pressure chamber provided between the central shaft and the shell. wherein a pressure fluid is delivered into the pressure chamber for compensation or adjustment of the deflection of the shell of the roll,
The mechanism further comprises two radial surfaces arranged to be pressed against each other and slidable relative to each other so as to prevent spillage of pressurized fluid to the outside of the pressure chamber proximate an end of the pressure chamber. said surfaces being pressed against each other and arranged to slide against each other are made of an inelastic material and arranged to be pressed against each other in the axial direction. 1. A mechanism for sealing the ends of a deflection-controlled roll, characterized by two flat radial surfaces, one of which is wider in the radial direction than the other. (2) The mechanism according to claim 1, wherein one of the radial surfaces is provided on a seal ring fixed to a body part attached to the central shaft, and the other radial surface is provided with a shell. A mechanism for sealing the end of a deflection-controlled roll, characterized in that it is provided on a rotating pair of rings. (3) The mechanism of claim 2, wherein said sealing ring is movably secured to said body part by axial spring means, and wherein said sealing ring has a radial surface. characterized in that the pressure of the pressurized fluid acting against the radial surface cooperates with the spring means to press the radial surface of the sealing ring against the radial surface of the counter ring. Mechanism for sealing the ends of rolls with controlled deflection. (4) In the mechanism according to any one of claims 1 to 3, the radial surface of the pair of rings is a wider surface and the radial surface of the seal ring is a wider surface. A mechanism for sealing the end of a deflection-controlled roll characterized by a narrower surface. (5) A mechanism according to any one of claims 1 to 4, in which the wider radial surface is made of a harder material than the narrower radial surface. A mechanism for sealing the ends of a deflection-controlled roll. (6) A mechanism according to any one of claims 1 to 4 for sealing the end of a deflection-controlled roll, characterized in that both radial surfaces are equally hard. mechanism.