DE102005022065A1 - press roll - Google Patents

Abstract

The invention relates to a press roll for treating a paper, cardboard, tissue or other fibrous web in a machine for producing and / or finishing the same with a flexible roll shell (1) and at least one axially over the roll shell (1) extending and on the inside of the roll shell (1) adjacent stripping element (4) for stripping liquid lubricant. DOLLAR A damage to the roll shell (1) is to be prevented in that the contact surface of the stripping element (4) with the roll shell (1) by a scraper (7) is formed, the roll shell (1) directed surface is curved.

Description

The The invention relates to a press roll for treating a paper, Carton, Tissue or another fibrous web in a machine for manufacturing and / or Refining the same with a flexible roll shell and at least an axial over extending the roll shell and on the inside of the roll shell adjacent stripping element for stripping off liquid lubricant.

It is necessary for shoe rolls, the oil introduced for lubrication and cooling controls again remove from the press roll, so the formation of a larger oil sump to avoid.

This is particularly in shoe rolls, which are arranged above a counter-roller are, problematic, since here is not stripped by the pressure shoe oil through Gravity can be directed into a tub. Therefore, be in these cases Used suction.

These Need suction However, a lot of space and increase the effort.

At the Using scrapers there is a risk of damaging the flexible roll shell through the doctor blade.

The The object of the invention is therefore to provide a simple and safe discharge of the To allow lubricant.

According to the invention was solved the task by that the contact surface the stripping element with the roll shell formed by a scraper is, its surface facing the roll shell as completely convex curved.

These convex curved surface can simply be formed by a scraper in the form of a rod in particular, the execution as a round or half-round rod is advantageous.

The curvature guarantees that the roll shell by the contact with the scraper no damage suffers.

There the flexible roll shell is yielding and thus the contact surface of the Scraper with the roll shell, in particular when pivoting the Scraper with different contact pressure, can vary, should be the curved Surface over the provided contact surface extend beyond.

The Stripping behavior of the scraper can be influenced by the structure of the surface become.

While one smooth contact surface of the scraper a good influenceability of the stripped amount over the Contact pressure of the scraper allows can at a grooved contact surface remaining on the roll shell Quantity of lubricant can be narrowed down better.

The Grooves should be parallel and radial.

Furthermore The stripped amount of lubricant can still over the Radius of curvature the contact surface to be influenced. The smaller the radius, the larger the stripped lot.

there it has turned out to be optimal when the radius of curvature the surface of the stripper facing the roll shell 1.5 and 40 mm, preferably between 2.5 and 7.5 mm.

A particularly simple construction of the stripping element results, when the scraper is attached to a swivel arm.

Of the Scraper can do so over a pivoting of the pivot arm to the inside of the roll shell be created and moved away from it.

The Apply the scraper can over a stop for the swivel arm or over a Actuator be limited.

Especially when using a stop, the swivel arm can over a Spring pressed against this become.

It can therefor but also, for example, hydraulic, pneumatic or electric Actuators are used.

A particularly advantageous device for the pressing of the scraper results itself when the swivel arm over one or more axially extending pressure hoses is pressed to the roll shell. The usually filled with compressed air flexible pressure hose takes care of a uniform contact pressure distribution and thus stripping the lubricant over the entire length of the Stripper.

Also the pivoting away of the scraper can be done with advantage by that the swivel arm over one or more axially extending pressure hoses is pushed away from the roll shell.

Independent of However, the nature of the actuator, it is advantageous if the contact pressure with which the scraper is pressed against the roll shell, adjustable, preferably controllable.

On the Contact pressure of the scraper is not only the burden of the roll shell but also determines the stripped amount of lubricant. One stronger Contact pressure leads for stripping a larger amount on lubricant.

In addition, over a Control of the contact pressure on the changing conditions received become.

in the For the sake of a high efficiency, the scraper should be largely on the extend entire roll shell. This should be a scraper in the press roll suffice.

Especially advantageous is the application of the scraper in press rolls whose Roll shell rotates about a fixed support, wherein a pressing element of the carrier presses the roll shell to a counter roll.

In These nip rollers will be the gap between the pressing surface of the Pressing element and the roll shell lubricated with the liquid lubricant, in particular oil.

If the pressing surface of the pressing element is concave, so this allows the Formation of a prolonged Press nip for intensive yet gentle treatment of Fibrous web.

With Advantage should the press roll and the counter roll a press nip for drainage or smoothing form the fibrous web, wherein the press roll above or below the counter roll can be arranged.

following the invention is intended to two embodiments be explained in more detail. In the accompanying Drawing shows:

1 : a schematic cross section through a scraper element 4 .

2 a schematic cross section through a lower pressure roller and

3 through an upper press roll.

The press roll has a flexible roll shell 1 made of fiber-reinforced plastic, which surround a fixed support 2 rotated, one being on the carrier 2 supporting, hydraulic contact pressure element 3 the roll shell 1 presses to form a press nip to a counter roll.

By the press nip formed between the press and the counter roll the fibrous web becomes smoothing alone and for drainage together with at least one water-absorbing drainage tape guided. Such press gaps can be found especially in production machines, i.e. Paper machines.

The pressing element 3 is formed by a press shoe extending over the press roll with concave pressing surface. This allows the formation of an extended press nip with a cylindrical counter roll.

Extended press column enable because of the longer Dwell an intensive but gentle treatment of the fibrous web.

The gap between the roll shell 1 and the pressing surface of the pressing element 3 is lubricated with oil. For this purpose, oil from a lubricant supply 6 on the inside of the roll mantle 1 applied.

So that during operation no too large oil sump in the roll shell 1 accumulates, part of the oil from the inside of the roll mantle 1 from a scraping element 4 stripped off and into a tub 5 dissipated.

While the press roll in 2 is located under the counter roll, it is located in 3 above the counter roll.

The installation position of the stripping element 4 is about the same in both cases.

To the roll shell 1 to protect against damage by stripping, has the scraper element 4 a scraper 7 in the form of an axially extending and on the roll shell 1 adjacent round rod.

The convexly curved surface of this round bar prevents damage to the roll shell 1 out.

The round rod has a smooth surface structure and a diameter between 5 and 15 mm. This ensures the stripping of a sufficient amount of lubricant at ge as possible Ringem contact pressure of the scraper 7 ,

The scraper 7 extends almost the entire length of the roll shell 1 , but at least the length of the pressing element 3 ,

As in 1 to see is the wiper 7 on a swivel arm 8th attached. This swivel arm 8th has a tilt axis 11 and is powered by two pressure hoses that can be filled with compressed air 9 . 10 emotional.

According to the arrangement of the pressure hoses 9 . 10 on a particular side of the swivel arm 8th and regarding the position to the tilt axis 11 provides a pressure hose 9 when inflating with compressed air for pivoting the scraper 7 to the roll shell 1 , where the other pressure hose 10 is relieved. For swinging away this pressure hose 9 relieved and the other pressure hose 10 filled with compressed air.

In the execution according to 1 are the pressure hoses 9 . 10 on the same side of the swivel arm 8th but on different sides with respect to the tilt axis 11 ,

But it is also possible, the pressure hoses 9 . 10 on different sides of the swivel arm 8th but on the same side with respect to the tilt axis 11 to arrange.

As at least the for the contact pressure of the scraper 7 responsible pressure hose 9 over the entire length of the scraper 7 extends, a uniform pressure distribution and thus also oil scrape across the width of the press roller is guaranteed.

The contact pressure of the scraper 7 can about the extent of the pressure hose 9 to be controlled. This makes it possible to influence the stripped amount of oil.

at a higher one Contact pressure is more oil stripped.

Claims (17)

Press roll for treating a paper, board, tissue or other fibrous web in a machine for producing and / or finishing the same with a flexible roll shell ( 1 ) and at least one axially over the roll shell ( 1 ) and on the inside of the roll mantle ( 1 ) adjacent stripping element ( 4 ) for stripping off liquid lubricant, characterized in that the contact surface of the stripping element ( 4 ) with the roll shell ( 1 ) of a scraper ( 7 ) is formed, whose to the roll shell ( 1 ) directed surface is curved. Press roll according to claim 1, characterized in that the scraper ( 7 ) is designed as a rod. Press roll according to claim 2, characterized in that the scraper ( 7 ) is designed as a round or half-round rod. Press roller according to one of claims 1 to 3, characterized in that the contact surface of the scraper ( 7 ) is smooth. Press roller according to one of claims 1 to 3, characterized in that the contact surface of the scraper ( 7 ) is grooved. Press roll according to one of the preceding claims, characterized in that the radius of curvature of the roll jacket ( 1 ) directed surface of the scraper ( 7 ) is between 1.5 and 40 mm, preferably between 2.5 and 7.5 mm. Press roll according to one of the preceding claims, characterized in that the scraper ( 7 ) on a swivel arm ( 8th ) is attached. Press roll according to claim 7, characterized in that the swivel arm ( 8th ) via an axially extending pressure hose ( 9 ) to the roll shell ( 1 ) is pressed. Press roll according to claim 7 or 8, characterized in that the swivel arm ( 8th ) via an axially extending pressure hose ( 10 ) from the roll shell ( 1 ) is pushed away. Press roll according to one of the preceding claims, characterized in that the contact pressure with the scraper ( 7 ) against the roll shell ( 1 ) is pressed, adjustable, preferably is controllable. Press roll according to one of the preceding claims, characterized in that the scraper ( 7 ) as far as possible over the entire roll shell ( 1 ). Press roll according to one of the preceding claims, characterized in that the roll shell ( 1 ) around a fixed support ( 2 ) and a pressing element ( 3 ) of the carrier ( 2 ) the roll shell ( 1 ) pushes to a counter roll. Press roll according to claim 12, characterized in that the gap between the pressing surface of the pressing element ( 3 ) and the roll shell ( 1 ) with the liquid lubricant, in particular Oil is lubricated. Press roll according to claim 12 or 13, characterized in that the pressing surface of the pressing element ( 3 ) is concave. Press roller according to one of claims 12 to 14, characterized that the press roll and the counter roll a press nip for dewatering or smoothing form the fibrous web. Press roller according to one of claims 12 to 15, characterized that the press roll over the counter-roller is arranged. Press roller according to one of claims 12 to 15, characterized that the press roll is arranged under the counter roll.