RECYCLING PLANT FOR GYPSUM PLASTERBOARD

Abstract

A recycling plant for gypsum plasterboard is disclosed having three roller crushers and three screens. The rollers can operate at varying rotational speeds and, as a result of the different rotational speeds of the rollers, the plasterboard pieces are comminuted such that the plaster of the paper or the carton is detached.

Claims

1. A recycling plant for gypsum plasterboard, comprising: a receiving apparatus for receiving comminuted gypsum boards in pieces measuring from 0 to 1000 mm, a first magnetic separator for separating off large metallic contaminants, a first shredder for comminuting the gypsum boards into pieces measuring from 10 to 100 mm, a second magnetic separator for separating off metallic components, a first screen for screening off gypsum particles smaller than 3 mm, in particular smaller than 2 mm, a second shredder for comminuting the pieces of gypsum board from the first screening installation, a second screen for screening off paper and undesirable materials, a third shredder for comminuting the pieces of gypsum, and a third screen for screening off the gypsum particles smaller than 3 mm, in particular smaller than 2 mm.

2. The recycling plant as claimed in claim 1, wherein the first shredder is a screw mill having three pairs of rollers.

3. The recycling plant as claimed in claim 2, wherein the two upper pairs of rollers operate at the same rotational speed, in particular at 20 to 40 rpm, and in that the third pair of rollers has a higher rotational speed than the latter.

4. The recycling plant as claimed in claim 1, wherein the upper pairs of rollers operate at a rotational speed of 20 to 40 rpm.

5. The recycling plant as claimed in claim 3, wherein the third pair of rollers operates at a rotational speed of 100 to 150 rpm.

6. The recycling plant as claimed in claim 3, wherein the third pair of rollers operates at a rotational speed of 120 to 140 rpm.

7. The recycling plant as claimed in claim 2, wherein the distance between the rollers of the lowermost pair of rollers of the screw mill can be adjusted in a variable manner via an actuator.

8. The recycling plant as claimed in claim 1, wherein the actuator can be activated automatically via a sensor arranged upstream of the lowermost pair of rollers, as seen in a conveying direction.

9. The recycling plant as claimed in claim 7, wherein the actuator is designed in the form of a hydraulic actuator.

10. The recycling plant as claimed in claim 1, wherein the first screen, the second screen and/or the third screen are designed in the form of flip-flow screens.

11. The recycling plant as claimed in claim 1, wherein the second shredder is a roller crusher, and wherein the two rollers operate at different speeds from one another and/or the two rollers have different profiles.

12. The recycling plant as claimed in claim 1, wherein one roller has a chevron profile and the other roller has an annular profile, and/or in that each roller has a dedicated drive motor.

13. The recycling plant as claimed in claim 1, wherein the third shredder is a roller crusher, and wherein the two rollers are designed in the form of smooth rollers.

14. The recycling plant as claimed in claim 1, wherein the two smooth rollers operate at different rotational speeds from one another.

15. The recycling plant as claimed in claim 1, wherein the screened-out gypsum particles from the first screen and from the third screen are conveyed to a central collecting apparatus, in particular via worm conveyors.

16. The recycling plant as claimed in claim 1, wherein the conveyor is a worm conveyor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

[0027] FIG. 1 is a perspective view of the recycling plant; and

[0028] FIG. 2 is a plan view of the recycling plant shown in FIG. 1.

[0029] In the figures, the same reference designations are used for identical or similar components, even if a repeated description is omitted for reasons of simplicity.

DETAILED DESCRIPTION OF SOME EMBODIMENTS

[0030] A recycling plant 1 is illustrated in FIGS. 1 and 2 having a receiving apparatus 3 at its beginning 2, in particular in the form of a bulk container. Roughly comminuted gypsum board (not shown) can then be introduced, in the form of bulk material, in the receiving apparatus 3. The receiving apparatus 3 may also have a coarse rasp 4, and therefore the gypsum boards can be slightly comminuted.

[0031] The material is then passed onto a first conveying belt 5 by the receiving apparatus 3, wherein a first magnetic separator 6 is arranged above the conveying belt. The magnetic force of the first magnetic separator 6 allows the separator to pick up metallic or constituents containing iron located in the material, wherein the non-magnetic parts of the material remain on the first conveying belt 5 by virtue of gravity. The material which remains on the first conveying belt 5 is then fed to a first shredder 7, which is configured in form of a screw mill. The material, which is fed to the screw mill via the first conveying belt 5 in a vertical direction V drops into the shredder 7 and passes through the latter on account of gravitational force and on account of the rollers rotating in relation to one another.

[0032] On an underside of the shredder 7, the material comminuted by the latter drops onto a second conveying belt 8, by which it is then transported onward in the transporting direction to a first screen 9. During transportation on the second conveying belt 8, the material comminuted by the first shredder 7 passes through a second magnetic separator 10, which likewise separates off once again magnetically conductive constituents from the comminuted material. The non-magnetic constituent parts of the comminuted material remain on the second conveying belt 8 on account of gravitational force.

[0033] The second conveying belt 8 then conveys the comminuted material to a first screen 9, which is designed preferably in the form of a flip-flow screen. The first screen 9 here screens out gypsum particles and conveys them by way of a conveying belt 11, which is assigned to the first screen 9, to a worm conveyor 12, wherein the gypsum particles already screened out in this stage of the recycling plant are then fed to a central collection apparatus 13 by the worm conveyor 12. The central collection apparatus 13 is formed here by three containers 14 where each container is filled by a central filling arrangement 15. Therefore, each container can be filled and, if a first container 14 is full, the other two containers 14 can be filled, while the first, full container 14 is changed over to an empty container 14. Therefore, the recycling process will not be interrupted.

[0034] The material which is not screened out by the first screen 9 is fed, via a third conveying belt 16, to a second shredder 17 in the form of a roller crusher. The passage through the second shredder 17 takes place once again by gravitational force and of the movement of the rollers of the second shredder 17 itself. The material which is comminuted by the second shredder 17 is then transported onward, via a fourth conveying belt 18, to a second screen 19, which is preferably configured in the form of a flip-flow screen. In the second screen 19, the material which is to be conveyed, in particular in pieces measuring between 0 and 20 mm, is screened out and fed on for further recycling. The oversized material screened out here consists of wood, styropor, paper or other undesirable materials. These are collected in a collecting container 20 and can then be put to other uses.

[0035] The material which is conveyed onward is then fed, via a fifth conveying belt 21, to a third shredder 22, which is likewise designed in the form of a roller crusher. The material which is to be conveyed is then conveyed from the third shredder 22, via a sixth conveying belt 23, to a third screen 24, which is likewise designed preferably in the form of a flip-flow screen. The third screen 24 then once again screens out gypsum particles, which are then fed, via a second worm conveyor 25, to the central collecting apparatus 13. The screened-out parts consisting of paper, wood or the like and also of gypsum residues which are larger than the predetermined gypsum particle size, can then also be fed on, in turn, for disposal or for further use.

[0036] The recycling plant makes it possible for the pieces of gypsum board for separation, containing different contaminants and/or of different sizes, to be recycled in effective and fail-safe manner and be separated from oversized particles and other undesirable materials. In particular the different shredders and the rollers thereof rotating at different speeds, make it quite possible to recycle even wet gypsum boards.

[0037] The foregoing description of some embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the invention. The specifically described embodiments explain the principles and practical applications to enable one ordinarily skilled in the art to utilize various embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims appended hereto, and their equivalents. Further, it should be understood that various changes, substitutions and alterations can be made hereto without departing from the spirit and scope of the invention as described by the appended claims.