Raking Systems for Waste Paper Pulpers

The suspension that rotates in the pulping process in the waste paper pulper spins the contrary material that came in with the waste paper, such as, e.g. wires, films, plastic and insoluble paper, into a rope.

If only smaller disconnected ropes are formed, so that raking using a rope winch is very complicated, we recommend using LOHSE raking systems, which can be adapted to the respective operations (periodic or continuous).

Installation and function

The stand-alone appliance is fastened to the floor next to the waste paper pulper. A discharge station (chute or funnel) into a transport container must be installed in the swivelling radius of the collecting arm, which runs contrary to the direction of the waste paper pulper. When at a standstill the swung out collecting arm stops above the discharge station.

A cleaning cycle is initiated when the waste paper pulper is pumped off and the residual suspension in the tank has been diluted back down to a material density of 1.5% to 3% with the required process water for the next pulping process.

Here an electric a hydraulic rotary actuator turns the collecting arm so
that the rejects fall out of the teeth.

On expiry of this dwell time the collecting arm is lifted out of the waste paper pulper and stops above the waste paper pulper for a defined draining period. The loaded collecting device then swings out over the edge of the waste paper pulper to the discharge station. Here an electric rotary actuator turns the collecting arm so that the rejects fall out of the teeth.

The collecting process can be repeated several times, depending on the contrary material.

The control sequence can be carried out at an integrated electric switchgear cabinet in manual or in automatic mode.

Details