JPS626038B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention introduces a fluid for heating a rotating calender roll into the calender roll from a stationary steam supply pipe, using a paper or cardboard tube with a sealing element between the stationary part and the rotating part. Concerning water/steam joints for calender rolls in calenders.

As is known, polishing is influenced by the temperature of the calender rolls. High temperatures are advantageous in terms of web smoothness. The polishing process is similar to ironing fabric with a flat iron;
Pressure, temperature, moisture and slip are the active factors in this case. Therefore, steam heating is often applied to at least a portion of the calender roll. It is therefore an object of the invention to provide a water-steam joint which serves to introduce heating steam from a steam pipe into the shell of a calender roll and correspondingly to remove steam therefrom.

The water/steam couplings known in the prior art are heavy and the possibilities that exist for supporting the water/steam couplings occur via the bearing housing of the calender roll. However, due to the bouncing of the calender rolls, the calender rolls rise in the vertical direction, but during such movement the calender rolls remain stationary in their horizontal alignment and one end of them moves forward. It is true that it moves. For this and other reasons, it is necessary to provide an elastic joint between the water/steam joint and the roll, so that the elastic joint is properly fitted so that the carbon gasket or equivalent of the water/steam joint does not cause rupture. Can be made to follow or move. Additionally, temperature changes create different forces in the spring and on the sealing surfaces of the water/steam joint, which can compromise the seal.

The object of the invention is therefore to obviate the above-mentioned disadvantages and to provide a simple water/steam coupling for calender rolls that is reliable during use. To achieve this purpose and others that will become apparent later,
A water-steam coupling for a calender roll in a paper or cardboard calender according to the invention is coaxial with the calender roll and coupled at one end for rotation with said calender roll by a bellows that compensates for at least angular misalignment. at least one tubular hollow shaft; a sleeve disposed on the outer tubular hollow shaft, movable axially relative to the tubular hollow shaft and rotating therewith; and associated with the sleeve; and a radially extending sealing surface, one of the two mating sealing surfaces being a carbon ring.

The invention will now be described in more detail with reference to embodiments of the invention that are illustrated in the drawings, but which do not limit the invention in any way.

In order to explain the intended application of the water-steam joint of the invention, reference is first made to FIG. 3, according to which the calender stack shown therein consists of calender rolls 22 placed one on top of the other. The calender roll 22 is received by a bracket 23 in the calender frame via a rotation shaft 26. On the side opposite the pivot axis 26 a lifting device 27, which is known per se from the prior art.
will be established.

Steam is introduced into the calender roll 22 to achieve the above-mentioned purpose. This introduction of steam is done by valve 25.
and from the steam pipe 29 by the water/steam joint 100 of the present invention. In FIG. 3, a single acting water/steam joint is designated by the reference numeral 100a and a double acting water/steam joint is designated by the reference numeral 100b. The steam inlet pipe leading to the water/steam couplings 100a, 100b is illustrated at 24a. The discharge pipe of the double-acting water/steam joint 100b is illustrated at 24b. Single acting water/steam coupling 100a is understood to mean in this example that the steam inlet is at one end of calender roll 22 and the steam outlet is at the opposite end of calender roll 22; Joint is understood to mean an arrangement in which the steam inlet and steam outlet are at the same end of the calender roll provided by a single-acting water-steam joint.

1 and 2, two different embodiments of the water/steam coupling of the invention will now be described. 1 and 2, the calender roll is designated at 22 and its bearing housing is designated at 23.
The calender roll 22 is provided with ball bearings in a manner known per se in the prior art. The calendar frame is designated by the reference numeral 21 in FIGS.

The water/steam couplings 100 illustrated in FIGS. 1 and 2 are generally symmetrical about their central axis A--A.
The steam inlet is illustrated by arrow B in the figure, and the steam outlet of the double acting water/steam joint 100b in FIG. 2 is illustrated by arrow C. As shown in FIG. 1, the water-steam coupling is a central tubular hollow connected by a relatively strong and pressure-resistant bellows 15 adjacent the shell of the calender roll 22. It has an axis 20. As illustrated in FIG. 2, a corresponding arrangement consists of a tubular shaft 9 and a tube 14 within it and coaxial therewith, both of which are connected by bellows adjacent to the barrel of the calender 22. do. The tubular hollow shaft 9 is connected adjacent to the end of the calender roll 22 by a bellows 15, and the tube 14 is connected to a steam exhaust pipe 30 in the calender roll 22 by a bellows 16.

As shown in FIGS. 1 and 2, sliding sleeves 4 are mounted on tubular hollow shafts 9, 20 with the aid of keys 13, only one of the sliding sleeves 4 is shown in FIG. The figure shows two sliding sleeves 4 opposite each other. The sliding sleeves 4 have sliding surfaces S on their protruding parts, and these sliding surfaces have a radially extending portion, the sliding surfaces being illustrated by thick solid lines in the figure. There is a carbon ring 2 on one side of these sliding surfaces S, and a carbon ring 5 on the other side, and these carbon rings are non-rotating.
Connect so that it rotates with the For sealing purposes, further O-rings 10, 11 are provided between the various parts. As shown in FIG.
have. Between the carbon rings 5 of FIG. 2 and the carbon rings 5, 19 of FIG.

As shown in FIGS. 1 and 2, the steam coupling has a body portion 3, with end flanges 12, according to FIG.
18 is attached to the body part 3 and the end flanges 1, 12 are attached to the body part 3 according to FIG. The tubular body part 3 is attached to a support part 6, via which it is integrally connected to the bearing housing 23 of the calender roll 22. Figures 1 and 2 further illustrate a coupling housing 17, which houses bellows 15, 16 therein.

The arrangement just described concentrates the movements of the seals relative to each other caused by thermal expansion and by wear into one single plane between the sliding sleeve 4 and the tubular hollow shaft 9.

Furthermore, regarding the action of the water/steam joint mentioned above,
The bellows 15, 16 are relatively rigid and their purpose is to compensate only for angular alignment deviations and not for axial movement. The invention is not limited in any way to the embodiments described above by way of example only.
For example, the inner part of the water/steam coupling is arranged to be non-rotating, and the outer housing part to be arranged to rotate with the calender roll.

Various details of the invention may vary within the scope of the inventive concept defined by the claims.

[Brief explanation of the drawing]

Figure 1 is a central sectional view in the axial direction of a single-acting water/steam joint, Figure 2 is a diagram similar to Figure 1 of a double-acting water/steam joint, and Figure 3 is an application of the water/steam joint according to the present invention. FIG. 2 is a front view of a stack of calendars. In the figure, 2 and 5 are sealing surfaces, 4 is a sliding sleeve,
8 is a spring, 9, 14, 20 is a tubular hollow shaft, 15,
16 is a bellows, 19 is a second sealing ring, 30 is a supply pipe, 100, 100a, 100b are water/steam joints, and S is a sealing surface.

Claims (1)

[Claims] 1. Introducing a fluid for heating the rotating calender roll from a stationary steam supply pipe to the calender roll,
with a sealing element between the stationary part and the rotating part,
A water-steam coupling for a paper or cardboard calender roll, wherein the coupling is coaxial with the calender roll and coupled at one end for rotation with the calender roll by a bellows that compensates for at least angular misalignment. a tubular hollow shaft; a sleeve is disposed on the outer tubular hollow shaft and is movable axially with respect to the tubular hollow shaft and rotates together with the tubular hollow shaft; A water/steam coupling characterized in that a radially extending sealing surface is provided, one of the two mating sealing surfaces being a carbon ring. 2. There is a tube in the outermost tubular hollow shaft, and the tube is connected by a bellows to the steam exhaust / in the calender roll.
A supply pipe, preferably connected to a steam discharge pipe, characterized in that the tubular hollow shaft and the pipes and their bellows define within themselves a cavity for the introduction and discharge of steam. Double-acting steam as described in item 1.
water fitting. 3. On the tubular hollow shaft there are two sliding sleeves facing each other, on both sides of the projecting part of said sliding sleeves creating a sealing surface with a sealing ring on the one hand and with opposite sealing rings on the other hand, the sealing of this latter 3. A double-acting water/steam joint according to claim 2, characterized in that a spring is placed between the rings to push them apart. 4. On the tubular hollow shaft there is a sliding sleeve, associated with its projecting part there are two sealing surfaces, associated with one of them is a first sealing ring, preferably a carbon ring, and a spring A single-acting water/steam coupling according to claim 1, characterized in that the spring applies pressure against the second sealing ring.