EP1314816A2 - Shoe roll - Google Patents

Abstract

A shoe roll (1) comprises a flexible, replaceable press cover (3) having two end regions. <??>A shoe roll comprises a flexible, replaceable press cover having two end regions; an end supporting disc (2); two end regions having reinforcing inlays (5) and being releasably coupled to the end supporting disc; and a quick-acting closure located between an inner wall of the end region and the end supporting disc. The quick-acting closure has radially pressing element structured to exert a pressing force and to seal an interior of the shoe roll from an external environment. <??>Independent claims are also included for: <??>(a) a quick-acting closure for a shoe roll for dewatering or calendering a moving fibrous web that includes a flexible, replaceable press cover having two axial end regions, reinforcing inlays provided in the two axial end regions and at the supporting disc positionable in the end region comprising a radially pressing element structured to exert a pressing force and to seal an interior of the shoe roll from an external environment; and radially pressing element located between an inner wall of the end region and the end supporting disc; and <??>(b) a process of connecting and disconnecting the press cover of the shoe roll comprising axially moving the end of the press cover onto the supporting disc, where the supporting disc radially opens the end.

Description

The invention relates to a shoe roller for dewatering or smoothing a running Fibrous web, in particular paper or cardboard web within a machine for Production and / or finishing of the fibrous web, with a flexible, exchangeable press jacket, which at least in one of its end regions Has reinforcing inserts and the press jacket on these end regions end-side support disks can be fastened in a sealing manner and when the Press cover is releasable.

As is known, such a shoe roller with a counter roller forms a press nip which is elongated in the web running direction.
The flexible press jacket is attached to a rotatable front support disc at each roller end.

A stationary support body extends through the interior of the press roll, on which the support disks are mounted and which supports a radially movable hydrostatic or hydrodynamic press shoe which serves to press the press cover onto the counter roll and is therefore also referred to as a shoe press roll.
The interior of the roller is under pressure to improve its running behavior.

For lubricating the contact surface between the press shoe and the rotating one Press sheath is usually used oil, which of course is not in the Environment.

The flexible press jacket is made of rubber or plastic, preferably Polyurethane.

Such a shoe roller is known from DE 196 45 407 A1 (PH10404).

To support the axial end area of the roll shell is the front Carrying disc (also referred to as a side plate) as a rim with an air-filled tube educated. The rim is rotatably mounted on the stationary support body, while the hose is connected to the roll shell. That way radial support of the end regions of the roll shell with radial Compliance achieved.

Often there is a reinforcement in the press jacket, consisting of scrim threads. Recently, the front end areas of the Press jacket, so as a better, more stable surface for mounting and To achieve disassembly of the press jacket.

Such a reinforcement insert is in the subsequently published DE 10138526.9 (PH 11301).

The machines for the production and finishing of the fibrous web are in continuous operation for longer periods.
The cloth-like press jacket and other machine parts of such a shoe roller must therefore be replaced regularly during the planned, short downtimes because of the wear that occurs. The exchange of the press cover often determines the downtime of the paper machine due to the complex assembly work.

The roll shell to be replaced must first be detached from the front wall. The new roll shell is then to be fastened to the end-side support disks in such a way that the required sealing of the interior of the press roll from the surroundings is ensured.
But also in cases where you have to get inside the roller for service purposes, the above-mentioned operations are necessary.

The respective type of assembly and disassembly is crucial for that Downtimes, which, as already mentioned, should be as short as possible.

In a press roll of the type mentioned at the beginning of DE 35 01 635 C2 (PH04461 A), a respective end region of the press jacket is pressed against the outer end face of the relevant end wall by means of a clamping flange, for which purpose it is necessary that the end region be bent radially inwards ,
To make this possible, the end region is provided with a large number of incisions and remaining tabs.
Adequate projections are provided in the end-side support disk, which engage in said cut-outs on the edge when the press jacket is installed.

The manufacturing effort for such fasteners is extremely high and would do not even occur if the edge areas of the press jacket are reinforced to let.

In addition, solutions are known in which the tabs mentioned individually with the front washers must be screwed. There are a variety of Screws necessary to give the press jacket sufficient hold and the Sealing the interior of the roller from the environment, on the one hand Prevent oil leakage and maintain a certain internal pressure on the other hand receive.

From DE 29702362 (PH 10287) it can be seen that the cylindrical press jacket end region for clamping is clamped between an inner spreadable, ie an expandable, ring with an enlarged diameter and an outer ring.
The disadvantage here is that the manufacturing process for the preparation of the roller end areas and the attachment takes less time than with the above-mentioned solutions, but the existing outer ring is annoying and also makes assembly and disassembly difficult again.

The invention is therefore based on the object, a shoe roller of the beginning specified type, in which the connection, one in its end areas reinforced press jacket with the front-side support disk with regard to the Ensure a reliable seal of the interior of the roller with simple and reliable acting means can be done faster than before without to change the outer dimensions of the roller significantly.

According to the invention the object is achieved in that a quick release is provided in such a way that between the interior of the press jacket end region and the front-side support disc a radially pressing and in its pressing force changeable element is arranged, which is also suitable, also the Sealing the interior of the shoe press roller gas-tight from the surroundings. The device according to the invention is located inside the press jacket. External clamping devices can be avoided. This is the The diameter of the shoe press roll in the edge areas is essentially the same big as in the middle part. The advantage here is that the shoe roller is not essential must be built wider than the counter roller to collide with Avoid tensioning elements. Another advantage is that the radial press Element is radially more flexible, and thus the concave deformation of the press jacket in the press nip between counter roller and concave shoe, also in the edge area at least partially. The deformation differences of the press jacket between the edge and the center are minimized, and the running time of the jacket extended.

This enabled the inventor to create a reliable and, as I said, one extremely fast-acting connection between the press jacket end and the roller create.

In a first variant (claims 2 to 7) is as a radially pressing element at least one inflatable pressure hose is provided which in the circumferential direction in a receiving groove of the front disc runs, he in pressurized condition tightly clamps the press jacket end area and loosens or releases the press jacket end area when the pressure is reduced.

The hose is constantly under pressure during the operation of the shoe press.

An expedient embodiment of the invention is that the Pressure hose receiving end of the end-face support disc with a Hose band is covered.

Furthermore, it is expedient if two pressure hoses are arranged next to one another in the axial direction around the front disk.
As a result, the arrangement acts like a double seal.
The outer hose facing the roller end and arranged in said receiving groove is located with its outer surface between the hose band and the receiving groove of the support disk, whereas the inner hose (which points in the axial direction to the middle of the roller) is located with its outer surface between the outside of the hose band and the Inner wall of the press jacket is located.

As already mentioned, the said hose band covers the one hose and therefore also possible abutting edges during the assembly process of the press jacket.

The hose band has a first area with a smaller diameter and a second area with a larger diameter. The first area surrounds the front end of the support disk in the interior of the shoe press roll and the second area surrounds or covers the pressure hose located in the receiving groove.
As a result, the hose band acts like a "shoehorn" when the casing is being assembled, thus making it easier to pull the press casing on and off axially.

This advantage is particularly effective when the second one, towards the center of the roll pointing hose is not provided.

It is advantageous if the said hose band at one end with the Carrier disc is connected. Alternatively, it is also possible that it is only pushed on, shrunk on or with one or both pressure hoses is firmly connected. This can reduce the assembly effort and also Durability of the hose band can be improved.

A practical design of the inner surface of the hose band and / or the Inner surface of the press jacket end area and the outer surface of one Pressure hose or the two pressure hoses provided can be in it exist that these are each provided with incorporated profiles. The Profiling the pairing of hose band / pressure hose or the pairing Press jacket / pressure hose interlocks when pressurized, see above that in addition to the frictional connection there is also a positive connection.

Profiles are grooves or grooves with a circular or polygonal Cross-section that run in the direction of rotation and / or transverse to the direction of rotation, conceivable.

According to a second of the variant of the inventive solution (claims 8 to 14) at least one piston-spring unit is provided as a radially pressing element. This piston-spring unit, which is in a circumferential recess in the front Disc is pressed over a pressurized by it Seal carrier a seal in the tension state against the inner wall of the End area of the press jacket. With this seal, which for example a Sealing ring, which is arranged around the seal carrier, can be a sufficiently good sealing of the interior of the shoe press roller against the Environment reached.

It is also provided that the recess open to the outside has an extension on each side. The extensions serve to hold one hose each filled with a pressure medium (for example with air) that can counteract the spring force. A part of the piston (piston disc) against which the hoses are supported is also arranged in these extensions or recesses.
The arrangement is such that, in contrast to the first variant described, when the hoses are pressurized, the end region of the press jacket can be detached from the end-side support disk.

To ensure a sufficiently good concentricity of the roller, are at least three, preferably six, piston-spring units with curved the diameter and the width of the recess in the front disc adapted contact surfaces of the piston or piston disc, segment-like or arranged in a star shape around the bottom of the recess.

But it is also conceivable that the pistons of the piston-spring unit as at least two-part, cylindrical part with a T-shaped cross-section and diameter and the width of the cutout of the face plate adapted contact surfaces is made.

The seal carrier pressed against the press jacket in the tensioned state is on its outer circumference with transverse to the circumferential direction (running direction of the jacket) radially provided incisions, which are against the Let the press jacket end area expand radially. The depth of the incisions is less than the depth of the circumferential groove worked into the seal carrier. In this outwardly open groove is the seal described above, which is an O-ring or ring with a square cross section, sealing cushion or the like, admitted. Their height is larger than the depth of them receiving groove, whereby the sealing effect is achieved.

In claim 16 protection is claimed for the invention Quick release.

Conventional shoe rollers, i.e. shoe press rollers to achieve a certain dryness or smoothing rollers to achieve a certain Smoothness of the fibrous web can with such an inventive Quick release can be retrofitted.

It should also be mentioned that the present invention is particularly suitable for roller shells with a reinforced end region which could not be fitted onto a shoe roller with conventional devices. Such a reinforced end region is described in the subsequently published DE 10138526.9, which is hereby fully explained as part of the description. For the solution according to the invention it is advantageous if the edge reinforcement is so large that excessive stretching of the jacket by the radially pressing element is avoided. The modulus of elasticity of the jacket in the circumferential direction should therefore be E ≥ 45 N / mm ² , preferably E 70 70 N / mm ^2, in particular E 90 90 N / mm ² .

Another advantage of the invention relates to the recovery of the jacket to be removed. While usually the press sleeves to be removed due to time constraints this labor-intensive step does not have to be cut out. The Invention allows the press jacket to be safely and orderly on the assembly side (Leader side) to expand. The same device can be used as it is is used for jacket installation.

The invention will be explained in more detail below using an exemplary embodiment become.

Figur 1 zeigt: einen Teillängsschnitt einer ersten Variante der erfindungsgemäßen Schnellverbindung (Schnellverschluss) zwischen einem Pressmantel der Schuhpresswalze und deren Stirnscheibe

Figur 2 zeigt: einen Teillängsschnitt einer zweiten Variante des erfindungsgemäßen Schnellverschlusses

Figur 3 zeigt: eine Ansicht A auf die Stirnseite der Variante gemäß Figur 2

Figur 4 zeigt einen Ausschnitt eines Details aus Figur 1

In the figures shown, the same reference symbols also mean the same components.

Figure 1 shows: a partial longitudinal section of a first variant of the quick connection according to the invention (quick release) between a press jacket of the shoe press roll and its end plate

Figure 2 shows a partial longitudinal section of a second variant of the quick release fastener according to the invention

FIG. 3 shows: a view A on the end face of the variant according to FIG. 2

FIG. 4 shows a section of a detail from FIG. 1

FIG. 1 shows a first variant of a quick release fastener or a quick connection, ie. the attachment of an end region E of the press jacket of a shoe press roll 1 with its front rotatable support disk 2.

The press jacket 3 is provided with reinforcements 4 in a conventional manner the reinforcement in at least one end region of the press casing compared to the middle region of the roller is reinforced with reinforcing inserts 5.

As a result, the end regions E are even more suitable than before for attachment to the rotatable front disks 2 (also called end covers or side shields).
The shape of the end region E, ie its diameter changes only slightly when the radial forces are applied. A conventional or simply reinforced end area would otherwise expand unintentionally. This is achieved by, among other things, an increased modulus of elasticity in the end area E.
This reinforcement 5, including the modulus of elasticity, is one that is described in the subsequently published DE 1013526.9, which is why further explanations of the reinforcement 5 will not be discussed further here.

It can also be seen from FIG. 1 that a radially pressing element is arranged between the end region E of the press casing 3 and the support disk 2. The force of this element can be changed.

At least one inflatable pressure hose 6 is provided as such a radially pressing element in this first variant, shown in FIG. 1 . This pressure hose 6 runs in the circumferential direction in an outwardly open groove 7 of the support disk 2.

Since the press jacket 3 is pushed axially onto the shoe press roll during assembly, it is particularly advantageous here that the outer diameter of the hose 6 becomes smaller when the hose pressure is reduced.
This creates the necessary play between the press jacket 3, ie in its end region E, in order to facilitate assembly and disassembly.

Figure 1 also shows a hose band 8, which covers the hose 6 and thus also reduces possible abutting edges. As a result, the device can act like a shoehorn, which of course makes it much easier to pull on the press cover 3.

In FIG. 1 , in addition to the hose 6, a second inflated hose 10, that is to say in the pressure state, can be seen in the axial direction. This hose 10 faces the inside of the roll WI and, as said, is arranged in the axial direction of the hose 6, which faces the end of the roll and also engages around the end-side support disk 2. With this arrangement, both hoses can function very effectively as a double seal. It can also be seen that the hose 10 facing the inside of the roll is located with its outer surface between the inner wall I of the press jacket 3 and the outer surface of the hose band 8, whereas the pressure hose 6 facing the end of the roll is located with its outer surface between the inner surface of the hose band 8 and the base the receiving groove 7 of the support plate 2 is located.

The hose band 8 has seen in the sliding direction of the press jacket 3 (at Assembly, as arrow S shows) a first area 8a with a smaller diameter and a second area 8b with a larger diameter. The first covers Area 8a is the end of the disk 2 on the end facing the roll interior WI. The second area 8b covers the pressure hose 6.

In the selected example, the hose band 8 is a single striped part and is on its outer end face connected to the front support disk 2. But it is also conceivable, the band 8 with one of the two or with both Connect pressure hoses 6 and 10 at the same time.

The inner wall I of the end region E of the press jacket 3 in the region of the Hose 10 and / or the outer surface of the hose band 8 in the area of Hose 6 and as a complementary counterpart to the outer surfaces of the said hoses can, as Figure 4 shows, be provided with profiles.

For example, the profiling can consist in providing recesses in the hose band and / or press jacket adapted to the diameter of the pressure hoses. The profiling can, however, also be designed and as can also be seen in FIG. 4 , in that the grooves are sawtooth-like, both in the hose or hoses and in the hose band and / or press jacket. Creases with a circular or polygonal cross-section are also possible.
The interlocking profiles can be present in the circumferential direction of the press jacket and / or also transversely to the circumferential direction. As a result, when the pressure hose or pressure hoses 6 and 10 are inflated, there is also a form fit in addition to the existing frictional connection.
This significantly increases the axial hold of the press casing 3 and the security against rotation and also operational safety during the transmission of force from the press casing 3 to the support disk 2.

FIG. 2 shows a second variant of the radial contact pressure and thus clamping of the press jacket 3 to the front support disk 2.
At least one piston-spring unit 12 consisting of spring 12a, piston 12b and a piston contact surface 12c is provided as the pressing element. This unit 12 is supported in a circumferential recess 13 of the front pane 2 that is open to the outside.

It can be seen in FIG. 2 that the cutout 13 has an extension 13a and 13b on each side to accommodate a relief hose 15 and 16, which counteracts the force of the spring 12a in such a way that the pressurized jacket 3 is pressed when the hoses 15 and 16 are under pressure can detach from the front disc 2.

In contrast to the variant according to FIG. 1 , compressed air for the pressure hoses only needs to be applied here to loosen the connection. Although the connection according to FIG. 1 is technically easier to produce, it requires more energy to generate the radial force, since this is to be applied during the entire operating state.

As shown in FIG. 2 , the piston 12b of the piston-spring unit 12 with a T-shaped cross section is adapted to the diameter and the width of the recess 13.

As can be seen from FIG. 3 , six springs 12a and six pistons 12b are provided. But depending on the diameter of the shoe press roller, for example, only three piston-spring units needed to be present in order to be able to arrange them segment-like or star-shaped around the base of the recess 13.

A seal carrier 14 which can be acted upon by the piston-spring unit 12 can be in the State of tension of the spring 12a against the inner wall I of the end region E. of the press cover 3.

The seal carrier 14 is provided on its outer circumference (see FIG. 2 ) with incisions 14a running radially in the circumferential direction (see FIG. 3 ). As a result, the seal carrier 14 can be easily expanded radially. This can be achieved because the incisions 14b extend up to the groove base 18 at the maximum. This design improves the sealing effect.

In this embodiment, however, the actual sealing is carried out with a Sealing element 19 reached.

This sealing element 19 is received in a groove 18 which is open to the outside and extends in the circumferential direction of the cylindrical seal carrier 14.
For example, a so-called O-ring or a ring with a square cross-section or a sealing cord, sealing cushion or the like can be selected as the sealing element.
The height dimension of the groove 18 is chosen to be less than the dimension of the diameter of the sealing element 19.

Another seal 20 is located in the seal carrier 14. This is necessary to seal the interior of the shoe roller.

It is to be added that the support plate 2 is made in two parts for assembly purposes is. Between these two parts is a further seal 20 from said Reasons.

REFERENCE NUMBERS

1

Shoe press roll

2

front-side support disc

3

press cover

4

reinforcement

5

reinforcing insert

6

tube

7

groove

8th

hose band

8a

small area

8b

large area

10

tube

12

Clamp-spring unit

12a

pressing surface

12b

piston

12c

pressing surface

13

recess

13a

Extension of the recess

13b

Extension of the recess

14

seal carrier

14a

incision

15

tube

16

tube

18

groove

19

sealing element

20

poetry

e

end

I

inner wall

WI

rolling Affairs

Claims (18)

Shoe roller for dewatering or smoothing a running fibrous web, in particular paper or cardboard web, with a flexible, exchangeable press jacket (3) which has reinforcing inserts (4, 5) in at least one of its end regions (E) and the press jacket (3) at this end region can be attached to an end-side support disc (2) and can be detached again when the press cover (3) is replaced,
marked by
a quick fastener in such a way that a radially pressing element (6, 10, 12) is arranged between the inner wall (I) of the end region (E) of the press cover (3) and the end-side support disc (2), which element is suitable at the same time the interior (WI) of the shoe roller (1) must also be sealed off from the surroundings (U). Shoe roll according to claim 1, characterized in that
the radially pressing element is at least one inflatable pressure hose (6), which runs in the circumferential direction in a groove (7) of the supporting disc (2), sealingly clamping the press jacket end region (E) when the pressure hose (6) is under pressure and in the pressure-reduced state loosens and / or releases the press jacket end area (E). Shoe roll according to claim 1 and 2, characterized in that
the area of the supporting disc (2) receiving the pressure hose (6) is covered with a hose band (8). Shoe roll according to claim 1 to 3, characterized in that
Two pressure hoses (6, 10) arranged next to one another in the axial direction around the support disc (2) are provided, the hose (6) facing the end of the roller with its outer surface extending between the inner surface (8b) of the hose band 8 and the groove (7) the support disc (2) and the pressure hose (10) facing the center of the roll is arranged with its outer surface between the outer surface of the hose band and the inner wall (I) of the press jacket (3). Shoe roll according to claim 3 and 4, characterized in that
the hose band (8) has a first region (8a) with a smaller diameter and a second region (8b) with a larger diameter, the first region (8a) the front end of the support disk (2) and the second region (8b) the pressure hose (6) covered. Shoe roll according to claim 3 to 5, characterized in that
the hose band (8) is connected to the supporting disc (2) and / or with one or both pressure hoses (6, 10) or is only pushed on and / or the pressure hose 6 forms a unit with the press jacket 3. Shoe roll according to claim 2, characterized in that
the inner wall (I) of the end region (E) of the press casing (3) is designed such that in the inflated state of the pressure hose (6, 10) there is also a positive fit in addition to the existing frictional connection. Shoe roll according to claim 1, characterized in that
at least one piston-spring unit (12), consisting of spring (12a) and piston (12b), is provided as a radially pressing element, with which a seal carrier (14) can be acted upon, which in the tensioned state counteracts at least one seal (19) presses the inner wall (I) of the end region (E) of the press jacket (3) and loosens or releases the press jacket (3) in the relaxed state. Shoe roll according to claim 8, characterized in that
the piston-spring unit (12) is accommodated in a circumferential recess (13) in the end-side support disk (2) which is open to the outside. Shoe roll according to claim 8 and 9, characterized in that
The recess (13) has an extension (13a, 13b) on each side for receiving an inflatable tube (15, 16), which counteracts the force of the spring (12a) in such a way that, when the tubes (15, 16) are under pressure, the press jacket (3) loosens or loosens from the front disc (2). Shoe roller according to claim 8 to 10, characterized in that
the piston (12b) of the piston-spring unit (12) is manufactured as an at least two-part cylindrical part with a T-shaped cross-section and with contact surfaces (12c) adapted to the diameter and the width of the recess (13) of the front disc (2) , Shoe roller according to claim 8 to 10, characterized in that
at least three, preferably six piston-spring units (12) with curved pressure surfaces (12c) of the piston (12b), which are adapted to the diameter and the width of the recess (13) of the front disc (2), segment-like around the base of the recess ( 13) are arranged. Shoe roller according to claim 8 to 12, characterized in that
the seal carrier (14) which can be acted upon by the piston-spring unit (12) is provided on its outer circumference with incisions (14a) running radially in the circumferential direction. Shoe roller according to claim 12, characterized in that
the seal carrier (14) has an outwardly open groove (18) for receiving a sealing element (19). Shoe roll according to claim 9 to 14,
characterized in that
the height of the recess (18) is less than the height of the sealing element (19). Quick fastener for a shoe roller for dewatering or smoothing a running fibrous web, in particular paper or cardboard web, with a flexible, exchangeable press jacket (3) which has reinforcing inserts (4, 5) in at least one of its axial end regions (E),
characterized in that
Means according to one or more of claims 1 to 15 are provided, by means of which the end region of the press jacket (3) can be fastened to the end-side support disk (2) Method for assembling and disassembling the press jacket (3) of the shoe roller (1) according to one of the preceding claims,
characterized in that
Assembly and disassembly is carried out by axially moving the press jacket (3) from the same machine side (assembly side / operator side). The method of claim 17
characterized in that
essentially the same assembly devices are used for assembly and disassembly.

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