FI90120B - Fastening method for a cylinder surface - Google Patents

Description

90120

The present invention relates mainly to the attachment of the sheath of closed shoe presses to rotating end plates, but method 5 can also be used to attach the sheaths of other rolls using thin casings with a fixed inner body.

Attaching the flexible sheath of the shoe press to the rotating end-10s is somewhat problematic.

The joint must be reliable, highly centered, pressure-tight and reasonably fast to install due to sheath renewals. The joint must also withstand the tensile stress along the longitudinal axis of the sheath, since the sheath is held in the correct shape by the removal force between the end plates, which is usually provided by springs or pressure.

An additional difficulty is the poor dimensional accuracy of the diapers. A typical maximum radius scatter is about 5mm.

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In current solutions, the attachment is made to the end portion of the flange after notching the edge of the sheath, but it is a laborious method and its tightness is not optimal.

Patents FI 44756, US 3,804,707, US 4,044,669 and patent application DE 33 38 487 A1 disclose a solution in which the jacket is fastened to the end plate by means of a pneumatically or hydraulically expandable ring or hose. There is always a risk of leakage in pneumatics and hydraulics, which is considerable in applications requiring high reliability and long service life. Sheaths secured with such pressure hoses have also had problems with creep creep because the attachment is subjected to intermittent loading that tends to gradually move the sheath out of the joint.

The solution according to the invention fulfills all the conditions initially set for a good connection in terms of safety, centerability, tensile strength, easy installation and pressure tightness, and is also relatively inexpensive.

2 90120 In the method of the present invention, the sheath is attached to the end plate by radial expansion of the elastomeric ring and sufficient tension is ensured at the expanding ring by a support ring placed on the opposite surface of the sheath, which is not necessary if the sheath is strong and rigid enough to withstand local stretching. The expandable tension ring is generally against the inner surface of the sheath and the support ring against the outer surface, but the joint also works by inserting the tension ring inside a cup-shaped end plate and clamping the sheath between the ring and the support ring to be inserted inside the sheath. The expansion of the tension ring can be achieved in several different ways. The expandable clamping ring can be formed by an elastomeric ring 15 inserted between two flanges, e.g. The elastomeric ring may be shaped in cross-section such that the outward expansion occurs primarily as an extrusion caused by a decrease in volume between the flanges, or the ring may be shaped so that the converging flanges fold outwardly from the groove of the intervening ring. The solution based on extrusion has a simpler design, but requires more compressive energy.

The support ring can be made in many different ways from different materials. The simplest solution is to measure. .25 a uniform collar made, for example, of a steel collar with a welded joint. The collar can also be easily made by wrapping it in some fiber and binder. The uniform steel collar can be made length-adjustable so that the collar is perforated so that only thinner heels of the base 30 are left under tensile stress. By bending the heels, the collar can be shortened and thus also tightened.

The support ring can also be replaced with an expandable ring placed outside the roll. Thus, the sheath is trapped 35 between two intumescent rings, inner and outer.

The features of the invention appear from the claims.

Il 3 90120

The invention will now be described in detail with reference to the figures.

Figure 1 shows a shoe press apparatus according to the invention with counter rolls, partly in longitudinal section.

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Figure 2 shows the invention in a perpendicular section of the tension ring before the elastomer ring is compressed.

Figure 3 shows the invention in a perpendicular section of the tension ring after compression of the elastomer ring 10

Figure 4 shows the invention in a perpendicular section of the tension ring before the elastomer ring is folded.

Figure 5 shows the invention in a perpendicular section of the tension ring after bending of the elastomer ring 15

Figures 6 and 7 show some embodiments of the invention in a perpendicular section of the tension ring.

Figure 8 is an axonometric view of an end joint according to the invention using a tightenable support ring.

Figure 2 shows a clamping ring 31 made of elastomer in the uncompressed state between the end plate 4 and the clamping flange 6, the clamping ring 31 fitting well inside the jacket 1.

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In Fig. 3, the clamping flange 6 is pressed close to the end plate by means of clamping screws 7 and the clamping ring 31 has had to be extruded out of its reduced groove and presses the sheath tightly against the support ring 21, which fastens the sheath tightly to the end plate 4.

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Figures 4 and 5 show a different expandable tension ring 32, the operation of which is based on the tension ring folding outwards from the tapered groove.

Fig. 8 shows the end of a shoe press with a length-35 delta-adjustable support ring 25, the adjustability of which is based on the fact that the brackets carrying tensile stress can be bent, e.g. as shown, whereby the ring decreases due to bending.

4,90120

To ensure the stability of the fastening, both the casing and the contact surfaces of the tension rings as well as the contact surfaces of the support rings may have matching grooves and protrusions.

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The invention is not limited only to the alternatives presented in this description, but includes all solutions according to the requirements.

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Claims (11)

Method for attaching the closed shoe press sheath or other thin sheath rollers (1) and stationary frame to the rotating end plates (4), characterized in that between the male ends and the end plate surfaces extending between the cylinders in relation to each other is provided. a radially inflatable clamping ring (31, 32), the function of which is based on the shape change caused by the tapered positioning latch and which, upon enlargement, produces compressive stress between the sheath and end and in this way attaches the clamp to the endplate. 2. A method according to claim 1, characterized in that an elastomeric ring (31) existing between the gable stationary and movable flange (31) is used as a tension ring, which swells out of the gap between the flanges due to the pressure increase of the elastomer ring, as the flanges are moved towards each other. 3. A method according to claim 1, characterized in that an elastomeric ring (32) existing between the gable stationary and movable flange (32) is used as tensioning ring, which breaks out of the gap between the flanges as the flanges are moved towards each other. 4. A method according to claim 1, characterized in that the inflatable clamping ring (31, 32, 33) is located inside the male end and outside the end plate. Method according to claim 1, characterized in that the blow-out clamping ring is located within the end plate. . (42) cup-shaped part and outside the outer surface of the jacket. 6. A method according to claims 1 and 4, characterized in that, as the outer support of the mantle at the point of attachment to excessive elongation, a support ring (21) or a band outside the mannequin is used. - 35 7. A method according to claims 1 and 5, characterized in that, as the inner support of the mantle at the point of attachment to excessive pressure, a support ring (24) is used inside the mannequin. 8 90120 Method according to claims 1, 4 and 6, characterized in that as the outer support ring (22, 23) of the mantle, the fixed or detachable cup-shaped part of the end plate is used, where the outer surface of the outer edge forms the outer support of the mantle. 5 Method according to claims 1, 4 and 6, characterized in that the support ring (21) which is used as the outer support of the jacket in the attachment point against excessive elongation is a metal, plastic or composite band. 10 Method according to claims 1, 4 and 6, characterized in that the support ring (25) used as the outer support of the jacket in the attachment point against excessive elongation is a perforated metal band which can be tensioned by bending of intermediate links. 15 11. A method according to claim 1, characterized in that the opposite surfaces of the tension and the sheath are suitably grooved in relation to each other. 20 25. : 30 35 li-