DD218918A1 - DEVICE FOR PRESSING A CIRCULAR BELT - Google Patents

Abstract

The invention relates to a device for pressing a circulating belt, which is expediently executed endlessly, on a running under the tape Entwaesserungsfaehiges material, for. B. a fibrous web, wherein the pressing device should allow as much variation of the contact pressure along a path defined by the sliding block. The inventive goal is achieved in that the pressing unit is designed as a multi-part shoe whose individual parts act differently on an elastic plate. The individual elements can be adjusted independently of each other or in their entirety so that either force or wegabhaengig an adaptation to the technologically desired result of the pressing treatment takes place.

Description

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Title of the invention .

Device for pressing a circulating belt

Field of application of the invention

The invention relates to a device for pressing a belt 5auflaufenden, which allows to control the pressure curve along the pressing path according to the technological requirements, wherein the dewatering of fibrous webs is the main field of application.

Characteristic of the known technical solutions

At the present time, roller pairs are used for dewatering fibrous webs, predominantly of pulp, paper and board webs, between which the web passes; "This type of pressing treatment leads to the known pressure increase or pressure drop, the course of which is determined by roll diameters, the hardness and thickness of the coating and the materials passed through

The technological disadvantages occurring are known in the art and require no further explanation. Vulture development has experienced this drainage means in that at least one of the two Anpreßeinheiten a pressed by a Gleitbalkeh circulating belt is used, the main problem in the control of the friction between the sliding surface and circulating belt, which at the required high ¹ -. '- 2 -. : '. '. , -:, '·, ·

Pressing takes on considerable proportions. In the WP 79 919, therefore, a solution is proposed, in which the rotating belt with the sliding beam forms an inlet gap, in which a lubricating liquid is drawn, which gives rise to such a low coefficient of friction, the setting of the technologically permissible pressing pressure along the press nip allows. With the design of the slide bar, the control of pressure increase and pressure reduction along the route becomes possible. It is also known, a so-called hydrostatic sliding bearing, that is to build a liquid cushion behind the elastic band »Despite the improvement achieved over the pair of rollers in the course of the pressing process, it is only possible in this and the known technical ,οί 5, the load in the press nip as a function of the rigid geometry or the constant liquid pressure. ·. '. Thus, an ideal adaptation to the dewatering characteristic of the fibrous web to be treated with respect to their variability still only partially possible or it is given only for a constant fibrous web.

Object of the invention

The device according to the invention pursues the aim of enabling a variation of the load on the circulating belt, which is adaptable to the tolerable pressure on the fibrous web. ; ,. , ^:; :. ;

Explanation of the essence of the invention;

The object of the invention is to design a pressure unit, which makes it possible to adapt the press zone according to the requirements of the thickness decrease of the fiber web in the press zone.

According to the invention the object is achieved in that for the production of the sliding surface a sliding beam is used, which is composed of several parts, which in turn are mounted on a continuous elastic plate, wherein the elasticity can also be achieved by introducing deeper hats between the individual elements. However, the sliding surface can also be generated by the individual elements of the beam itself by joining them together by means of concave or convexly curved end pieces and keeping them in a suitable position.

The expedient structure of the overall device is when a main carrier which is pivotally mounted at two points and immovably fixed in the direction of motion »by any number of individual elements, which is relative to the Hauptträ- ger and relatively adjustable Bind, added to the load unit. The control of the load takes place, force or path dependent.

A variant of the invention is to seal the individual elements on the side facing away from the circulating belt, z. through a mounted plate.

In this case, a lubricant may additionally be introduced through the joint gaps between the individual elements, wherein the lubricant is supplied via a channel mounted in or in some of the individual elements. '). ^{; ;} , ... '... , , , ,

Embodiment '- .. _'' :

The invention will be explained in more detail with reference to the drawings of exemplary embodiments:

Show it:

Fig. 1 shows the section through a slide bar with representation 30 'of the fixed and force application points and the sliding surface in the form of a continuous elastic plate, in cooperation with the press zone zugeord-. Neten elements.

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Pig, 2 a section through a sliding beam in principle analogous to Pig. 1, wherein the individual elements of the 'sliding bar by means of concave and convex curvature' of the end pieces are joined together,

Fig. 3 shows the section through a sliding beam ', in principle analogous to FIGS. 1 and 2, in which the individual elements on the. The sliding surface facing away from the sealed side are

/ and an additional lubricant is introduced via channels. . ' , , ':'. '' :. '''· -.

According to Pig. 1 to 3 has the device for pressing. • a main support 1 are movably arranged on the individual elements 2 and which is fastened to the press frame via the articulation points 3 and 4. · The individual elements 2 mounted on a continuous elastic plate 13 are pressed against the surrounding by the pressing units 5 Volume 6. pressed, which in turn transmits the'Drook on the fibrous web 7 and the mushroom. The opposite support surface 9 is formed by a moving web, e.g. The circumference of a roll or can also be a circulating band, in Fig. 2, the arrangement of the individual elements 2 is shown in particular, which are joined together by concave and convex end pieces and connected via brackets 10 in their entirety and the individual elements 2 at the same time Form a sliding surface «,

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In Pig. 3, a further possible arrangement of the individual elements 2 is shown, which is sealed by a plate 11 at the opposite side of the sliding surface and via channels 12 an additional lubricant is supplied. , , .. '' ..: · ... · '.' . '.

Claims (4)

Invention claim h 1. An apparatus for pressing a circulating belt, characterized in that the pressure unit has the shape of a multi-part shoe, whose individual 'elements (2) assembled by means of concave and convex curved end pieces and separated from each other and. in their entirety, they can be adjusted in a force- or path-dependent manner. :: - "': * Mounted 2. Device according to item 1, characterized in that the individual elements (2) coatings on the a revolving belt? Mndte, continuous elastic plate (13), · '. · ..'','.' ., 3. Device according to POINT 1, characterized in that the individual elements (2) are provided with a channel (12) and a suitable lubricant through these channels in the moving Piachen and from there to the sliding surface .., whereby the sealing takes place after the point of action facing away from the active site by a continuous plate (11),: ·. , , ·, ' 4. Device after point. 1, characterized in that the individual elements (2) with a channel (12) are provided for lubricant and the seal after "the side facing away from the active site by a through-looking plate (11) takes place. '- I For this ί sheet drawing