DD271879A1 - ROLLER SEALING - Google Patents

Abstract

The invention relates to a so-called Herzstueck as a sealing element on the Stirnflaechen of roller presses or Walzenmuehlen, where feinkoernige products are processed and a special seal of the Walzeneinzugsraumes is necessary. According to the invention, this is achieved in that, in the case of radial and axial deviations of two rolls from each other, the core is made flexible such that deformation is possible due to the action of the rollers and thereby circular and oval sealing profiles on the outer edges of the core in a circumferential groove of the rolls immerse and maintain the sealing effect. The invention is particularly suitable for two-roll systems with relative roll displacements and also the heart pieces are subject to high impact wear.

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a roller seal for roller presses and roll mills, with which fine-grained products compacted between 2 rolls or coarse-grained produk ^ crushed while a deflection of the product is to be prevented at the end faces of the Wafzenballens.

Characteristic of the known technical solutions In general, heart pieces are designed so that they rest against the end faces of the roll barrel or in circumferential grooves

immerse, which are located near the end faces. Aufgi and the high labyrinth effect becomes the arrangement of

Grooves with centerpiece in most cases preferred. Especially with wide roll bales can be uneven Feeding or by different grain sizes tilting of the roll bales arise. Besides, it's still too

Consider that a certain axial offset due to the axial clearance of the roller bearing and the manufacturing tolerances is unavoidable.

Under these conditions, rigid frogs are jammed, resulting in a high fretting wear especially on the side of the Loswalze leads and requires a short-term exchange. Core pieces made of non-metallic elastic materials such as rubber, plastic or the like are abraded at short notice and

thus ineffective. Not insignificant is also that by the expulsion of the air in Kompaktierprozeß a

Stress of the frogs is done by impact wear. There are also such sealing elements known on two-roll systems, which are either adjustable from the outside or Adjustability is automatically ensured by additional forces. Except the already mentioned disadvantages regarding the Flexibility and wear can be expected here at a higher cost. The efficiency of this seal influences the compaction process more, the finer the product to be processed. Under certain conditions, this process can even be interrupted. Object of the invention

The aim of the invention is to carry out a heart-piece seal for a two-roll system so that the friction and impact wear of the frogs under mechanical stress decreases, consequently the service life is improved and the effectiveness of the processing of the product is increased.

Explanation of the essence of the invention According to the invention the object is achieved in that the frog seal from a thin-walled flexible Main body consists, which receives according to the radius of the rolling grooves circular or oval sealing profiles. The GruniJkörper and the sealing prototypes are non-detachably welded together. In the case of irregular loading of the rollers, radial and axial deviations occur due to the center-piece seal

have to be compensated. This is achieved in that the base body is so thin-walled that under the

Force of the rollers deformation is possible. The sealing profiles can in the rolling groove on the sealing surface

roll or slide, whereby the sealing effect is maintained.

For the prevention of Prnllverschieißes is a wear layer of a polyurethane between the sealing profiles

applied, which is regenerable .

embodiment

The invention: oll be explained in more detail in the following examples. In the accompanying drawings shows:

Fig. 1: Center piece sealing nit rollers Fig. 2: Center piece seal at zero position of the rollers Fig.3: Center piece seal with roller offset. The Horzstückabdichtung, preferably for sealing granular products on the faces of the roll bales of Rollers 1 and 2, consists of body 3, sealing profile 4, pad 5 and attachment. 6 In Fig. 1, a two-roll system is shown, wherein the roller 1 but without the roller 2 with axial and radial deviation

is working.

The center piece seal is received by grooves arranged laterally on the roll bale. To the horizontal Cutting plane of the roll centers are the basic body 3 and the sealing profile 4 corresponding to the groove bottom with a radius CwZed, which is larger than the groove base diameter. Below this cutting plane, the sealing profiles 4 run parallel. The sectional plane is shown in FIG. This zoigt the rollers in an ideal position to each other, in which the sealing effect optimally On the side of the rollers where the product is processed, the center-piece seal between the sealing profiles receives one

non - metallic coating 5, which fills the entire frog point and above the center of the roll at least one fifth of

Roll diameter betragon should. Particularly in the case of roll surfaces which have a profile transverse to the roll direction, gas is used during the compacting process

which, together with the entrained fine-grained product in the catchment area of the waltz, against which

Herzstüekabdichtung bounces and causes high wear here. The regeneration of the coating 5 is carried out by casting or spraying a polyurethane without affecting the Heart seal. The thickness of the lining is chosen so that an adjustment of the frog seal, as shown in Figure 3, not hindered The most unfavorable deviation of the two rollers relative to each other can be seen in FIG. The radial deviation is due to an elastic and uniform loading of the roller 2, while the axial Deviation is caused essentially by the skew of the roller 2. Due to the deformation of the base body 4 when loaded by the rollers, the centerpiece is able to change the To adapt conditions. The effectiveness of the sealing of the roller intake space, especially in fine-grained products with low density and high Gas content is significantly improved.

Claims (3)

1. roll seal as a heart seal at the ends of roll bales, preferably for roller presses or roll mills with 2 rolls, where at least 1 roller is not rigidly arranged and the task or finished product is fine-grained, characterized in that an elastic body (3) at least 2 circular or oval sealing profiles (4) and these sealing profiles (4) are non-detachably connected to the base body (3). 2. roll seal according to claim 1, characterized in that between the sealing profiles (4) a coating (5) is applied from a polyurethane and this covering (5) fills the entire frog point and above the roll center is at least one-fifth of the roll diameter. 3. roll seal according to claim 2, characterized in that this covering (5) is arranged on the heart piece seal on the side of the roll interior.