WO2015132302A1

WO2015132302A1 - Rolling press

Info

Publication number: WO2015132302A1
Application number: PCT/EP2015/054513
Authority: WO
Inventors: Heinz SCHRÖDER; Silvio Lorenz; Dirk Schefer
Original assignee: Thyssenkrupp Industrial Solutions Ag; Thyssenkrupp Ag
Priority date: 2014-03-06
Filing date: 2015-03-04
Publication date: 2015-09-11
Also published as: PE20161420A1; AU2015226232B2; BR112016020647A2; AU2015226232A1; CL2016002233A1; DE102014102989A1; BR112016020647B1

Abstract

A rolling press comprises two rolls (1) forming a nip (3), and at least one side wall (4) delimiting the nip (3) in the direction of the longitudinal axes (2) of the rolls (1), and is characterized by a wear-resistant element (5) for the side wall (4) which is movable transversely to the longitudinal axes (2) of the rolls (1). A movement of the wear-resistant element (5) brings different sections thereof at least into the vicinity of the narrowest portion of the nip (3).

Description

roller Press

The invention relates to a roller press with two rolls forming a nip and at least one side wall delimiting the nip in the direction of the longitudinal axes of the rolls.

In a roller press, a material bed, the so-called feed material, fed from above, fed into the nip formed between the rollers and thereby compressed and crushed.

The feed material is fed in via a feed chute arranged above the nip. In this case, side walls of the feed shaft regularly protrude at the end faces of the roller rollers into the high-pressure zone in the narrowest part of the roller gap and prevent leakage of the compacted rolling stock. These thus also act as an end seal to the roller rollers.

As compression progresses, the pressure that the rolling stock exerts on the side walls of the feed tray in the direction of the longitudinal axes of the roller rolls increases and is highest in the high pressure region. In particular, there is a considerable wear of the side walls by the pressure exerted by the rolling stock, the relative movement of the rolling stock to the side walls and the abrasive properties of the rolling stock.

This increased wear is counteracted by equipping the side walls with hard, wear-resistant materials. Depending on the operating conditions of the roller presses, in particular the nature and thus the abrasiveness of the material to be rolled and the set width of the nip, such wear protection for the side walls must be replaced at defined intervals. For this purpose, a standstill of the roller press is required regularly, which means a loss of production.

In DE 100 12 696 B4 a roller press is described in which the nips of the adjacent portions of the side walls of the end faces of piston-shaped wear protection elements are formed. With progressive wear of the end faces of these wear protection elements, these can be tracked via an adjusting device in the direction of the rollers. As a result, the downtime required for replacing the wear protection elements of the roller press with respect to those roller presses, in which wear protection elements are easily interchangeable disposed on the inner sides of the side walls, can be significantly reduced.

A disadvantage of the known from DE 100 12 696 B4 roller press is the considerable design effort for the integration and in particular the sealing of the trained between the wear protection elements and the side walls column.

A similar roller press is also known from DE 665 141. In this also arranged in recesses of the side walls wear protection elements are known, which are movably mounted in the direction of the end faces of the rollers. It is envisaged to press the wear protection elements via weights or loaded by springs against the end faces of the rollers, whereby a tracking with increasing wear of the wear protection elements is achieved.

Also in this embodiment of a roller press the sealing of the gaps formed between the wear protection elements and the remaining side wall poses a problem. In addition, adjusting the weight or spring load to changing operating conditions may be required to prevent the wear protection elements from the pressure in the Nip are lifted too far from the end faces of the rolls or rest under excessive pressure on the rollers.

Based on this prior art, the invention has the object underlying, downtime of a roller press, which arise in conventional roller presses by replacing wear protection elements, to reduce as much as possible in a structurally simple way. This object is achieved by a roller press according to the patent claim 1 and a method according to the patent claim 15. Advantageous embodiments of the roller press according to the invention are the subject of the other claims and will become apparent from the following description of the invention. In a roller press with two rolls forming a nip and at least one side wall delimiting the nip in the direction of the longitudinal axes of the rolls, according to the invention a wear protection element is provided for the side wall, which is displaceable transversely, preferably vertically, to the longitudinal axes of the rolls, wherein by sliding different portions of the wear protection element at least adjacent to the narrowest part of the

Roll nips are positionable.

A method according to the invention for operating such a roller press envisages that the wear element is displaced as a function of its wear state in at least the section adjacent to the roller gap, in particular the narrowest part of the roller gap.

Accordingly, the wear protection element may be arranged with a portion adjacent to the narrowest part of the nip until a wear limit is reached. Then, the wear protection element can be moved so far until a new section, which has not yet reached the wear limit, adjacent to the narrowest part of the nip is arranged. Such a displacement of the wear protection element can be carried out without stopping the system and thus without resulting production loss. In particular, it may also be provided that a plurality of wear protection elements are provided, which are used directly one after the other, so that a first wear protection element, after its last section has reached the wear limit, shifted from the area adjacent to the narrowest part of the nip and simultaneously or subsequently a second Wear protection element is moved to position this with a portion adjacent to the narrowest part of the nip. The displacement of the wear protection element is preferably carried out discontinuously and thus at regular or irregular time intervals by a respective defined distance. But it is also possible a (slow) continuous displacement of the wear protection element.

The wear protection element may in particular be a separate component from the side wall. In this case, the wear protection element may preferably be movably guided in a guide on the side of the side wall which is adjacent to the end faces of the rollers. As a result, a structurally simple integration of the wear protection element in the side wall can be achieved. In addition, sealing problems, such as occur in the known from DE 100 12 696 B4 or from DE 665 141 known integration of in the direction of the longitudinal axes of the rollers movably guided wear protection elements in openings of the side walls can be avoided.

But it is also possible, the wear protection element as an integral part of the side wall, in which this is displaceable in an opening relative to the remaining side wall to form. Likewise, it is possible to form the entire side wall as a wear protection element and to form corresponding displaceable in a direction transverse to the longitudinal axes of the rollers.

In order to ensure that the wear protection element is not displaced by the moving relative to this rolling stock, as long as in the narrowest part of the nip portion adjacent the wear limit has not yet reached, can in a preferred embodiment of the roller press according to the invention means for need-fixing the wear protection element be provided in different positions relative to the rollers. These fixing means can be designed in any desired manner, for example as passive means, such as positive and / or non-positive holders (for example a screw connection).

As a "wear protection element" is basically understood an element that is functionally provided for, the side wall in at least one section before To protect a rapid wear of the rolling stock and / or the rollers. In this case, (at least on the side adjacent to the nip, the wear protection element should (but does not have) consist of a material which is more resistant to wear compared to a base material of which the side wall is substantially formed.

Of course, the wear protection element can also consist entirely of such a relatively wear-resistant material. Optionally, however, the formation of the wear protection element with an existing of a low-cost material body and a relatively wear-resistant wear protection layer can show as economically advantageous. In this case, the wear protection layer can be formed for example by a wear-resistant build-up welding. It is also possible a stocking of the body with wear-resistant elements, such as carbide elements.

The wear protection element may also consist of a material on several sides, which is more resistant to wear compared to the base material of the side wall or a main body of the wear protection element. This may allow the wear protection element, after all sections have reached the wear limit on the side adjacent to the nip, to continue to use by turning.

Furthermore, it can be provided that the wear protection element forms a plurality of wear protection zones which differ in terms of wear resistance on the side adjacent to the nip. Thus, it can be provided, for example, that a middle zone of the wear protection element, which is arranged covering the narrowest part of the nip, from a particularly wear-resistant and therefore possibly comparatively expensive material, while edge-side zones of the wear protection element, not in overlap of the narrowest part of the Roll nips are arranged, are formed of a less wear-resistant and thus possibly less expensive material.

In a preferred embodiment of the roller press according to the invention it can be provided that the wear protection element extends from a feed chute, can be introduced via the feed material in the roller press, in the direction of the narrowest part of the roller gap. This can allow easy insertion and / or handling of the wear protection element via the feed chute.

The direction of movement of the wear protection element may preferably be aligned parallel to tangents of the rollers in the narrowest part of the nip and in particular perpendicular to the plane defined by the (parallel) longitudinal axes of the rollers.

Further preferably, it can be provided that the wear protection element is automatically displaceable by drive means. This can allow a comfortable, in particular automatic tracking of the wear protection element. Such drive means may also perform the function of means for securing the wear protection element as required in different positions relative to the rollers by operating in the inactive state, i. if they do not actively move the wear protection element, prevent accidental displacement of the wear protection element.

For an automatic tracking, a control unit may further be provided, which is designed to control the drive means as a function of the wear state of the wear protection element in the section adjacent to the nip and in particular the narrowest part of the nip. In this case, the wear state can be determined particularly preferably by means of a wear sensor. However, it is also possible to estimate the state of wear taking into account the operating parameters of the roller press, in particular the type of feedstock used, the rotational speed of the rolls and the width of the nip in the narrowest part. This can also be done automatically by means of the control unit. In a further preferred embodiment of the roller press according to the invention can be provided that the wear protection element covers the nip in its widest part to at least 80%. It can thereby be achieved that the entire, highly stressed by the rolling or feed material portion of the side wall is protected by means of the wear protection element.

The wear protection element is preferably mounted exclusively (and particularly preferably exclusively in one direction) transversely to the longitudinal axes of the rollers relative to these. This may be sufficient for the implementation of the functionality of the invention and also allows the formation of a structurally simple guide for the wear protection element.

The invention will be explained in more detail with reference to an embodiment shown in the drawings. In the drawings, each schematically shows:

Fig. 1: a roller press according to the invention; and

Fig. 2 to 5: different embodiments for an insertable in the roller press according to FIG. 1 wear protection element.

The roller press shown in greatly simplified form in FIG. 1 comprises two rollers 1, which are aligned in such a way that their longitudinal axes 2 extend essentially parallel to one another. Characterized a nip 3 is formed with a constant width between the rollers 1, which forms the smallest nip width in the plane formed by the two longitudinal axes 2 level. This area represents the narrowest part of the nip 3.

For operation, the roller press can be oriented such that the plane formed by the two longitudinal axes 2 is aligned as horizontally as possible. During operation of the roller press, a feed material (not shown) is poured into the nip 3 via a feed chute. By a counter-rotating drive of the rollers 1 corresponding to the direction of rotation arrows shown in FIG. 1, the feed material is then gradually into the nip third pulled and compacted and crushed. The comminuted rolling stock can then fall into a container (not shown) arranged below the nip 3 or onto a conveyor belt positioned there.

The feed shaft is formed by four walls. In this case, two side walls 4 are arranged at the longitudinal ends of the rollers 1. The side walls 4 are connected to each other at the edge by means of two transverse walls (not shown), which run approximately parallel to the longitudinal axes 2 of the rollers 1. In Fig. 1, only the rear side wall 4 is shown in the viewing direction.

When compacting the rolling stock is pressed against the side walls 4 at high pressure. In connection with the relative speed to the rolling stock and the often highly abrasive properties of the rolling stock, the side walls 4 are therefore subject to high wear, which is greatest in the region of the narrowest part of the nip 3 because of the strongest compression there.

Each of the side walls 4 is therefore assigned on its side facing the rollers 1 a centrally arranged with respect to the two rollers 1 wear protection element 5. The wear protection elements 5 are each guided in a guide, not shown, of the associated side wall 4 in a direction which is perpendicular to the longitudinal axes 2 of the rollers 1 and also perpendicular to the plane formed by the longitudinal axes 2, movable. In an intended for the operation of the roller press, in approximately horizontal orientation of the plane formed by the longitudinal axes 2 of the rollers 1 level thus results in an approximately vertical mobility of the wear protection elements fifth

The wear protection elements 5 are each automatically by means of a drive device, which may be provided, for example in the form of an electric servomotor with a drive pinion 7 which engages in a formed by the associated wear protection element 5 rack 6, automatically displaced.

A displacement of the wear protection elements 5 takes place as a function of the state of wear of those portions of the wear protection elements 5, which currently located adjacent to the narrowest part of the nip 3. If a wear limit for these sections of the wear protection elements 5 is reached, these can be displaced by means of the drive devices by a defined distance, whereby new sections that have not yet reached their wear limit, adjacent to the narrowest part of the nip 3 are positioned. The state of wear can be determined by means of a respective wear sensor 13. The actuation of the drive devices then takes place as a function of measurement signals of the wear sensors 13 by means of a control unit 12. Stopping the roller press is not necessary for displacing the wear protection elements 5.

A displacement of the wear protection elements 5 is preferably carried out from top to bottom (relative to the direction of gravity). This allows the wear protection elements 5, after they have reached the wear limit over their entire length, are released by a last shift from the associated guides and fall off the roller press. Then these can be disposed of, turned over for reuse or processed. Simultaneously with the release of a worn first wear protection element 5, a second wear protection element (not shown), which directly adjoins the first wear protection element 5 in the direction of displacement, is positioned with a first portion adjacent to the narrowest part of the roller gap 3. As a result, an uninterrupted protection of the side walls 4 is realized by means of wear protection elements 5.

FIGS. 2 to 5 show various possibilities for forming the wear protection elements 5 designed as bars with a rectangular cross-section.

2 shows a wear protection element 5 in the form of a solid wear protection body. This thus consists entirely of a comparatively wear-resistant material, e.g. a carbide.

In contrast, in the case of the wear protection elements 5 according to FIGS. 3 and 4, a main body 8 is provided which is unilaterally (see FIG opposite sides (see Fig. 4) is provided with a wear protection layer 9 of a wear-resistant material. The wear protection element 5 with a wear protection layer 9 on both sides (see Fig. 4) is suitable for double use by turning after one side has been completely worn.

FIG. 5 shows the possibility of forming at least the side of a wear protection element 5 with wear protection zones 10, 11 which faces the end faces of the rollers 1 and has a wear-resistant design. For example, it may be provided to provide a central wear protection zone 10 (based on the transverse direction of the wear protection element 5 oriented perpendicular to the direction of displacement), which is characterized by a higher wear resistance relative to peripheral wear protection zones 11. This takes into account the fact that, as is apparent from Fig. 1, with a larger width of the wear protection elements 5 compared to the width of the nip 3 in its narrowest part only one central portion (with the wear protection zone 10) of the wear protection elements 5 is exposed directly to the rolling stock. On the other hand, over the full width, the wear protection elements 5 are acted upon by the rolling stock only in wider sections of the nip 3 with correspondingly reduced pressure load.

The formation of a wear protection element 5 with different wear protection zones 10, 11 is possible both in an embodiment as a solid wear protection body according to FIG. 2 and in a design with one or more wear protection layers 9 on a base body 8 according to FIGS. 3 and 4. LIST OF REFERENCE NUMBERS

1st roller

2nd longitudinal axis of the roller

3. nip

4. Sidewall

5. Wear protection element

6. Rack

7. Drive pinion

8. basic body

9. Wear protection layer

10. Wear protection zone

1 1. Wear protection zone

12. Control unit

13. Wear sensor

Claims

claims

1. roller press with two a nip (3) forming rollers (1) and at least one of the roller gap (3) in the direction of the longitudinal axes (2) of the rollers (1) limiting side wall (4), characterized by a wear protection element (5) of the side wall (4), which is displaceable transversely to the longitudinal axes (2) of the rollers (1), wherein by shifting different portions of the wear protection element (5) at least adjacent to the narrowest part of the roller gap (3) can be positioned.

2. Roller press according to claim 1, characterized by means for on-demand fixation of the wear protection element (5) in different positions relative to the rollers (1).

3. Roller press according to claim 1 or 2, characterized in that the wear protection element (5) at least on the nip (3) adjacent side consists of a material which is more resistant to wear compared to a base material of the side wall (4).

4. Roller press according to claim 3, characterized in that the wear protection element (5) on the nip (3) side facing away from a material which is more resistant to wear compared to the base material of the side wall (4).

5. Roller press according to one or more of the preceding claims, characterized in that the wear protection element (5) has a base body (8) and a wear protection layer (9).

6. Roller press according to one or more of the preceding claims, characterized in that the wear protection element (5) has different wear protection zones (10,11).

7. Roller press according to one or more of the preceding claims, characterized in that the wear protection element (5) is guided in a guide of the side wall.

8. Roller press according to one or more of the preceding claims, characterized in that the wear protection element (5) extends from a feed slot of the roller press in the direction of the narrowest part of the roller gap (3).

9. Roller press according to one or more of the preceding claims, characterized in that the movement direction of the wear protection element (5) is aligned parallel to tangents of the rollers (1) in the narrowest part of the roller gap (3).

10. Roller press according to one or more of the preceding claims, characterized in that the wear protection element (5) is automatically displaceable by drive means.

11. Roller press according to claim 10, characterized by a control unit

(12) for driving the drive means in dependence on the wear state of the wear protection element (5) in the nip (3) adjacent portion.

12. Roller press according to claim 11, characterized by a wear sensor

(13) for determining the state of wear of the wear protection element (5) in the section adjacent to the nip (3).

13. Roller press according to one or more of the preceding claims, characterized in that the wear protection element (5) the roller gap (3) limited to at least 80% laterally.

14. Roller press according to one or more of the preceding claims, characterized in that the wear protection element (5) exclusively in a direction transverse to the longitudinal axes (2) of the rollers (1) relative to these is displaceable.

15. A method for operating a roller press according to one or more of the preceding claims, characterized in that the wear protection element (5) is displaced depending on the state of wear at least in the narrowest part of the roller gap (3) adjacent section.