EP1177838B1 - Drum screen - Google Patents

Abstract

A drum sieve (10) machine has at least one rotating drum with a perforated sieve plate (12) that can be driven. Outside on the sieve plate sleeve are located strips extending in the longitudinal direction of the drum which are each matched to the hole circumference of neighboring sieve holes (14) and partially surround these. The strips surround the sieve holes each by half the hole circumference. A cutting mechanism is provided for the cutting through of material wrapped outside on the drum. A cutting mechanism can be located on one or more strips.

Description

The invention relates to a drum screen machine according to the preamble of claim 1. Such a drum screening machine is known from US-A-5071544. Drum screening machines are used for a wide variety of requirements. You will find applications for screening compost, bark mulch, chopped wood, Sand, gravel, contaminated soil, broken building rubble or residual waste.

The sieve drums are together with their drive motor in a frame stored, which can also be designed to be mobile. For cleaning the sieve drums cylindrical brooms are currently used, which perforate the screen from the outside clean inside by inserting the individual bristles. This cleaning technique works perfectly with sticky masses, such as wet soil, sand or moist compost. On the other hand, the processing of residual waste leads to very often long particles, some of which fall through the perforated screen, such as tapes, Cords, tapes etc. for wrapping the sieve drum, which is due to the Covering the respective screen holes to a considerable deterioration of the Performance. If a screening drum is provided for such an application, metallic scrapers are currently used on the outer jacket of the drum screens. However, these externally adjustable metal wipers lead to one high wear and go hand in hand with a large noise emission, which for the Operator of the drum screen machine is often unacceptable.

It is already e.g. from US-A-5 373 948, a drum screening machine with at least one rotatingly drivable Drum with perforated perforated sheet metal casing known, on the outside the pipe holes surrounding the perforations are welded to the jacket. This Construction has two major drawbacks. On the one hand, in jam cylindrical tube particles. On the other hand, windable parts, such as tapes, cords, ropes etc. wound between the pipe sockets. This wound up However, parts can no longer be carried out on the outside Sheath arranged metallic wipers can be removed. The advantage of the scheduled Pipe socket compared to the simple perforated sheets lies in the processing of residual waste in that the smooth tube walls are a bulky hook Prevent objects in the holes in the perforated plate.

The object of the invention is to make a drum screening machine known Design in such a way that they are particularly suitable for the screening of Residual waste is suitable.

According to the invention, this task is based on a generic Drum screening machine through the combination with the characteristic feature of claim 1 solved. So enclose on the outside of the screen plate jacket Drum-extending strips neighboring screen holes partially. With this construction principle the hole circumference is at least partially surrounding ledges a jamming of bulky objects in the Screen plate largely prevented. On the other hand, it is not a closed one Pipe that connects to the drum hole, causing jamming of particles in the pipe is also effectively prevented. Because the respective Sieve holes are only partially enclosed, the cross section widens outwards compared to the perforated screen. In to the main claim subsequent subclaims are advantageous design variants reproduced the invention.

In this way, the strips can enclose the sieve holes each half of their circumference. This creates an optimal compromise between the danger of yourself Clogging of the holes due to bulky objects on the one hand and the risk of Clogging of the subsequent pipe socket by particles etc. on the other hand found.

Even tapes, cords, etc. that wind up on the drum can be more easily Removed from the drum jacket. According to a preferred one Design variant provided at least one cutting unit, which for Cutting through the materials wound on the outside of the drum serves. such Cutting units can be attached to one or more strips on the circumference of the drum be arranged.

Fig. 1:

eine teilweise perspektivische Darstellung eines Siebblechmantels einer Trommelsiebmaschine nach einer Ausführungsform der vorliegenden Erfindung,

Fig. 2:

einen Querschnitt durch den Siebmantel gemäß Fig. 1,

Fig. 3:

das Detail B aus Fig. 1 und

Fig. 4:

das Detail A aus Fig. 2.

Details and advantages of the invention are explained in more detail with reference to an embodiment shown in the drawing. Show it:

Fig. 1:

2 shows a partial perspective illustration of a screen plate jacket of a drum screening machine according to an embodiment of the present invention,

Fig. 2:

2 shows a cross section through the screen jacket according to FIG. 1,

Fig. 3:

the detail B from Fig. 1 and

Fig. 4:

detail A from FIG. 2.

The screen drum 10 shown in FIG. 1 has a screen plate jacket 12. The Sieve sheet jacket 12 has a plurality of sieve holes 14, which are shown in FIG. 1 have been presented in simplified form using just a few examples. The sieve holes extend usually distributed evenly over the entire screen plate jacket 12. In the embodiment variant shown here, the sieve holes are 14 aligned along parallel lines in the longitudinal direction to the screen plate jacket 12. The drum screen has flanges 16 and 18 on the side. The drum screens point free cross sections on each of their faces. The storage of the drum screens and the drive are customary. Based on the detail B in Fig. 3 is too recognize that parallel to the rows of holes with holes 14 strips 20 parallel welded to each other and aligned in the longitudinal direction of the screen plate jacket 12 are. The perspective representation of the detail B can in particular the shape of the strips 20 can be found in the bottom row. The Lasts are made up of two alternating elements. To the one of the semi-circular cross-section enclosing the respective screen holes 14 Sheet metal parts 22 and straight connecting webs 24, the connect the semicircular shaped strip parts 22 to one another. In detail B and Fig. 1 are not all holes 14 and strips 20, as they are real on the Sieve sheet jacket are present, shown. So this is just a simplified one Representations.

In Figures 2 and 4, the strips 20 are in a corresponding sectional view shown. In particular, it can be clearly seen here how the strips 20 are vertical protrude from the screen plate jacket 12. Inside the sieve sheet is here present embodiment variant a firmly connected to the screen plate jacket 12 Shown screw 26, which is used to transport the material to be screened. However, this screw 26 is not mandatory, since the transport of the Good to be screened also by appropriately tilting the screen plate jacket 12 can be achieved.

Not shown in the figures is a cutting mechanism with which around the screen plate jacket 12 coiled cords, tapes, tapes etc. along the length Drum can be cut so that it can be rotated further Drum fall off from this. These cutting units can be similar, for example the cutting units of bar mowers, so-called finger bars, mulch bars or double knife bar. The operation of the cutting units can be done by simply folding the gate controls if required.

Claims (4)

1. Drum screening machine with at least one rotatably driven drum (10) with perforated screening sheet cover (12), wherein shoulders (20) that are each adjusted to the hole circumference of adjacent screening holes (14) and extend in the longitudinal direction of the drum are arranged outside on the screening sheet cover (12), characterized in that said shoulders (20) each partially envelop said screening holes (14).
2. Drum screening machine according to claim 1, characterized in that the shoulders (20) each cover half the circumference of the screening holes (14).
3. Drum screening machine according to claim 1 or claim 2, characterized in that a cutter is provided for cutting material wound outside onto the drum (10).
4. Drum screening machine according to claim 3,characterized in that a cutter can be arranged on one or more shoulders (20), respectively.

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