In a rake system, a reamer element is attached to a reamer arm, which is movable backward and forward. A pivot axle of the reamer arm is formed on the distal end of a control arm, which is pivotable around a further pivot axle. During forward movement of the reamer arm, the reamer element pushes raked material collected by the rake to a discharge edge at the upper end of the rake. During backward movement of the reamer arm, the control arm is lifted, and the reamer element is moved back at a distance from the rake.
1. A rake system with a rake, to be arranged at an angle in a channel, and a reamer, comprising:
a reamer arm for conveying raked material to a discharge edge,
a pivot axle, above the rake, around which the reamer arm is suspended in a swinging manner,
a first actuating device by which the reamer arm is displaceable in backward and forward movements along the rake, and
a reamer element at a distal end of the reamer arm which faces the rake,
wherein the reamer element is caused to run on the rake during the forward movement and to run at a distance from the rake during the backward movement,
wherein the reamer arm is suspended on a distal end of a control arm, which is pivotably mounted on its proximal end,
wherein, for swiveling the control arm, a second actuating device at least at times engages at the control arm,
wherein the first and second actuating devices are coupled with one another such that movements of the control arm and the reamer arm are synchronized, and
wherein the second actuating device does not engage with the control arm during the forward movement of the reamer arm.
2. The rake system according to claim 1 , wherein the first and second actuating devices have a motorized drive.
3. The rake system according to claim 1 , further comprising a crank axle connected with the reamer arm by a tension element mounted eccentrically with regard to the crank axle.
4. The rake system according to claim 3 , further comprising a cantilever that protrudes from the crank axle and that can bear against the control arm with its distal end.
5. The rake system according to claim 3 , further comprising a cam disk attached to the crank axle, wherein an edge of the cam disk forms a control cam, and the control arm has a contact element which can bear against the control cam.
6. The rake system according to claim 1 , wherein a pivot axle of the control arm is located approximately above an upper end of the rake and extends in the horizontal direction over the rake, and wherein the crank axle is located below the control arm and, as seen looking in the direction of the forward movement, behind the reamer arm.
7. The rake system according to claim 3 , wherein a pivot axle of the control arm is located in a housing, which consists of two sides extending parallel to the control and reamer arms, and wherein the housing is positioned above the upper end of the rake by height-adjustable supports.
8. The rake system according to claim 1 , further comprising a slider pivotably held in the housing that can bear against the reamer element.
9. The rake system according to claim 7 , further comprising a motor-transmission unit for operating the crank axle arranged on a side of the housing.
10. The rake system according to claim 1 , wherein a receiving groove, having a closed floor, is connected via an interruption-free transition to the upper end of the rake, wherein said receiving groove contains a screw conveyor, and wherein the interruption-free transition forms a discharge edge for the raked material and an overflow edge for press water generated in the receiving groove by the screw conveyor.