Twin screw pump grinder

Abstract

A screw conveyor, for the transport of flowable substances and / or lumps of material, includes a rotatable first screw provided with helical windings arranged in a housing with an inlet opening and an outlet opening. The housing includes an inlet chamber and a pumping chamber between the openings. In at least in the pumping chamber there is a second screw provided with helical windings and arranged for rotation in the opposite direction of the first screw, the screws in the pumping chamber providing a positive displacement pumping function by mutual engagement. Also provided is a cutting device downstream of the pumping chamber and housed within a knife house including an internal channel, where the knife house is connected to the outlet opening. By providing the knife house with second outlet, overfilling of the knife house is prevented. As an alternative means for varying the internal volume of the knife house may be used.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of application Ser. No. 10 / 483,296, which is the National Stage of International Application No. PCT / DK02 / 00481, filed 10 Jul. 2002 (which is hereby incorporated by reference).TECHNICAL FIELD [0002] The present invention relates to a screw conveyor for the transport of flowable substances and / or material having: a rotatable first screw provided with helical windings arranged in a housing with an inlet opening and an outlet opening, the housing including an inlet chamber and a pumping chamber between the inlet and outlet openings; at least in the pumping chamber, a second screw provided with helical windings and arranged for rotation in an opposite direction of the first screw, the first and second screws in the pumping chamber providing a positive displacement pumping function by mutual engagement between the first and second screws when the rotatable first screw is rotated in a first sense of rotation...

AI Technical Summary

Benefits of technology

"The present invention provides a screw conveyor that can prevent overfilling of the pumping chamber and associated knife house during interruptions of continuous flow of substance through the outlet section of the conveyor. This is achieved without the need to stop the rotation of the pump screws in the screw conveyor entirely during periods of interruption of continuous flow of substance. The screw conveyor includes a rotatable first screw and a second screw with helical windings arranged in a housing with an inlet opening and an outlet opening. The second screw is positioned in the pumping chamber and is provided with helical windings that mutually engage with the first screw when the first screw is rotated in a first sense of rotation. The conveyor also includes a cutting device downstream of the pumping chamber and housed within a knife house, which is connected to the outlet opening of the screw conveyor. The knife house is provided with second outlet means or a displaceable member that can increase the volume of the knife house to counteract the tendency to overfill it during interruptions of the flow."

Problems solved by technology

Special problems arise, however, if the flow of substances has to be interrupted (periodically), for instance if the screw conveyor is used for carrying out filling operations in sausage manufacturing.

This interruption may cause problems with overfilling of the pumping chamber in the conveyor and it has been known to solve this problem by stopping the conveyor during the clipping period.

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