FIELD: ore concentration, construction, coal and chemical industries. SUBSTANCE: front wall of hopper is hinge mounted with possibility of increasing size of discharge hole. Front wall is furnished with pull-back springs whose tension can be readjusted. Hinge gate is provided with counterweight from outside in from of threaded rod two check nuts. Device provides enhanced adaptability to operation, possibility of discharging of large-size lumps of material. EFFECT: enhanced operation reliability, enlarged capacity control. 4 cl, 2 dwg
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