Liquid purification or separation – Structural installation – Flume stream type
Reexamination Certificate
2000-09-28
2001-08-28
Lithgow, Thomas M. (Department: 1724)
Liquid purification or separation
Structural installation
Flume stream type
C210S160000, C210S357000, C210S400000
Reexamination Certificate
active
06280612
ABSTRACT:
NEW DESCRIPTION
The invention relates to a revolving screening rack with a driveable endless screening belt, according to the preamble of claim
1
.
A revolving screening rack of the type referred to here is known from German utility model 89 01 245 U1. This revolving screening rack is produced in the manner of a closed link chain, the individual links serving as screening elements of a screening belt and being supplemented by a plurality of rack hook elements. These rack hook elements are capable of being moved in such a way that in each case a rack hook element can be displaced through between two plates of a screening element, hence engages through the screening element. That is to say, the rack hook element is designed to be capable of being moved in and out. At the same time, the rack hook element is activated via a steering lever which is pivotably articulated at one end on the rack hook element. The other end of this steering lever is guided in a guide track which lies within the space enclosed by the revolving screening rack. In this case, the guide track is selected in such a way that the rack hook elements are drawn in at a point on the revolving screening rack at which a cleaning brush engages on the screening rack.
One disadvantage of this known screening rack is that the guide track has to be adapted to different conveying heights of the revolving screening rack. Furthermore, when the revolving screening rack is tensioned between two deflecting devices, problems arise, since, here too, the guide track has to be adapted when the deflecting devices are moved away from one another.
WO 91/13671 discloses a revolving screening rack, in which the rack hook elements are arranged on the screening rack so as to be capable of being moved in and out. The rack elements are in each case activated via a steering lever which is guided at one end in a guide track. The revolving screening rack has a telescopically extendable supporting frame, to which deflecting devices for the screening belt are fastened. The telescopically extendable supporting frame is capable of being fixed in its respective extended position.
The object of the invention is, therefore, to specify a revolving screening rack which does not have these disadvantages.
The object is achieved by means of a revolving screening rack which has the features of claim
1
. A revolving screening rack with a driveable endless screening belt is provided, the screening belt being formed by a plurality of screening elements. These screening elements in each case have a plurality of elongate plates which are arranged parallel to and at a distance from one another. In order to hold the plates at a desired distance from one another, spacer means may be used. A bar-shaped connecting element engages in each case through the plates of a screening element, so that the plates of two screening elements are connected to one another so as to be pivotable relative to one another in the manner of a link chain. Furthermore, the revolving screening rack has a pivotably mounted rack hook element which is capable of being pivotably displaced, at least partially, through between two plates located next to one another. The rack hook element is therefore capable of being moved out and in relative to the screening element. For this movement of the rack hook element, a steering lever is provided, which is pivotably articulated at one end on the rack hook element. According to the invention, the other end of the steering lever is pivotably mounted on the screening belt. It is consequently advantageously possible to move the rack hook element in and out relative to the screening element, in the region of a deflecting device of the revolving screening rack, merely by means of the selected kinematics, without a guide track being used. Consequently, cleaning of the screening belt can be carried out in the deflection region. It is advantageous, furthermore, that the so-called sill jump, when the revolving screening rack is arranged in a flume, can be selected low, so that there is a saving of material here and simple installation in the flume or channel is possible. Since there is no need for a guide track, it is possible in a simple way to tension the revolving screening rack between two deflecting devices, since the displaceability of the rack hook element in the deflection region is achieved by means of the screening belt itself. The revolving screening rack according to the invention is also distinguished in that the screening belt is driven directly, that is to say the screening belt also forms the driving chain. As a result, the number of wearing elements is reduced and a larger screening surface can be provided, which increases the effectiveness of the revolving screen rack according to the invention.
An exemplary embodiment of the revolving screening rack according to the invention is distinguished in that the steering lever is fastened so as to be pivotably mounted at its other end on a screening element of the screening belt which, as seen in the conveying direction of the screening belt, follows the screening element which has a rack hook element. Consequently, the steering lever and therefore also the rack hook element are actuated in the deflection region of the screening belt, in that the bearing points of the steering lever move toward one another, that is to say approach one another.
In a preferred embodiment, there is provision for the bar-shaped connecting element to engage through that end of the steering lever which is articulated on the screening belt. The steering lever bearing point located on the screening belt side is thus formed in a simple way. This bearing point therefore coincides with the pivot axis of two screening elements.
A particularly preferred exemplary embodiment is distinguished in that at least one plate, designed as a control shackle, of the screening element on which the steering lever is mounted is of essentially triangular form, a bar-shaped connecting element engaging in each case through two corner regions and the steering lever being arranged so as to be rotatably mounted on the third corner region. The bearing point of the steering lever is thus displaced out of the region of the screening belt. This ensures easy access to the steering lever, so that the latter can be exchanged in a simple way, for example in the event of damage. Alternatively, the control shackle may also be of T-shaped or L-shaped form. In the case of a T-shaped control shackle, a bar-shaped connecting element engages in each case through the two ends of the transverse web, the steering lever being arranged so as to be pivotably mounted on the free end of the horizontal web of the T. In the case of the L-shaped design of the control shackle, a bar-shaped connecting element in each case engages through the ends of the long leg of the L. The steering lever is then arranged so as to be pivotably mounted on the free end of the short leg of the L.
In the case of an L-shaped or T-shaped control shackle, therefore, the short leg of the L or the horizontal web of the T forms a prolongation. In the case of the triangular control shackle, the third corner region forms this prolongation. The prolongation has a bearing lug for the pivotable mounting of the steering lever, the prolongation extending transversely to the longitudinal extent of the control shackle.
In a preferred embodiment, there is provision for the rack hook element to be rotatably mounted on the bar-shaped connecting element. The pivot axis of the rack hook element thus coincides with the pivot axis of two screening elements.
There is therefore no need for any additional outlay in order to make it possible for the rack hook element to be movable.
A preferred exemplary embodiment is distinguished in that the rack hook element is of essentially L-shaped form. The rack hook element is pivotably mounted between the plates of a screening element on the free leg end of the L. The base of the L provides a rack prong which, during the pivoting movement of the rack hook element, emerges from
Lithgow Thomas M.
Nogerath Holding GmbH & Co., KG
Ostrolenk Faber Gerb & Soffen, LLP
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