FIELD: crushing or grinding of various materials.
SUBSTANCE: hopper comprises hinged side walls configured to turn into a first position and a second position, and a connection wall attached between hinged side walls. Connecting wall comprises flexible element and is made with possibility of folding in response to rotation of hinged side walls from first position to second position. Hopper is a part of installation for processing of mineral material.
EFFECT: inventions provide fast collection and maximum power.
12 cl, 6 dwg
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