Twittern

Further developed

• Basics of engineering sciences

• Development of the population from 2000 BC to the...

• 3 Siebkennzahl K_V- und Trennkorngrößen d_T-...

• Diagram of a force-limited vibrating system

• Diagram of a resonance screen with flexibly...

• Resonance curve of resonance screens

• Diagram of a flexible-drive resonance screen

• Diagram of a flexible-drive resonance screen,...

• Diagram of a resonance screen with flexibly...

• Diagram of a double-momentum vibrating screen

• Diagram of a troughed vibrating screen

• Banana screen from the company Siebtechnik

• Double-frequency screening machine from Rhewum

• Diagram of an elliptical-motion screen with...

• Diagram of an elliptical-motion screen with...

• High-speed single-deck screening machine, type...

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Summary: The development of engineering sciences played an important role in the

screening practice from the 20^th century. Growing requirements, as regards increasing variety, fineness and throughputs of the materials to be screened led to the further development of existing or new screening principles for the classification of special materials to be screened. This development is demonstrated by the example of throw screening focussing on the indirectly excited screening machines. Directly excited throw screening machines will be the topic of a third contribution.

1 The influence of engineering sciences on the screening practice in the 20^th century taking into account demographic facts

The scientific-technical revolution, beginning in the 19^th and continued in the 20^th century, caused enormous changes in engineering, science, economy and society. Various branches of engineering experienced a considerable upward trend [1] and basic sciences such as mathematics, physics and chemistry received an important impetus. In about the mid-20^th century, the engineering sciences became established as independent technical-scientific disciplines, such as mechanical...