초록 ▼

A process and a device are used to process granulated materials such as abrasives for centrifugal wheel cleaning systems or welding powder for welding machines. Operation is based on the suction principle; an adjustable amount of ambient air is drawn in to be used as the conveying air for the granul

A process and a device are used to process granulated materials such as abrasives for centrifugal wheel cleaning systems or welding powder for welding machines. Operation is based on the suction principle; an adjustable amount of ambient air is drawn in to be used as the conveying air for the granulated material and takes the latter to the processing device. A part of this conveying air is also used to separate foreign bodies from the granulated material. Granulated material and conveying air flow in a stream of material which gradually grows wider and thinner, to an accumulation point from which they trickle in the form of a screen to a hopper. In the process the other portion of conveying air flows through them. The ambient air that is drawn in may also be used to remove dust from an operating compartment before it is used as conveying air. Negative pressure prevails throughout the system to prevent particulate escape into the environment.

대표청구항 ▼

A process for purifying granulated materials used in a work station, comprising the steps of: drawing in a variable amount of ambient air as a conveying air for conveying said granulated material, a variable portion of this conveying air being used to separate non-granular particles flowing with the

A process for purifying granulated materials used in a work station, comprising the steps of: drawing in a variable amount of ambient air as a conveying air for conveying said granulated material, a variable portion of this conveying air being used to separate non-granular particles flowing with the granulated material from the granulated material; conveying the granulated material as a flow of material in a pipeline with a first circular cross-section, the end of said pipeline being gradually changed in shape to provide a flow of material with a second cross-section which is wider and thinner and also larger than said first cross-section, and ultimately being changed gradually, on an inclined surface, into a flow of material with a third cross-section wider than said second cross-section and in a thin, greatly retarded layer reaching an accumulation area having a variable storage volume; trickling the flow of material down from said accumulation area in the form of a curtain through which said variable portion of the conveying air flows transversely to a storage area; varying the grain size of the non-granular particles to be separated from the granulated material by modifying the thickness of the screen and the amount of variable portion conveying air; and delivering additional granulated material by increasing the amount of conveying air when the amount of granulated material in said storage area falls below a variable preset minimum.