Impact crusher capable of adjusting aggregate fineness modulus

Abstract

An impact crusher capable of adjusting aggregate fineness modulus comprises a machine case, a feeding device, a crushing cavity, a rotor and a discharge channel, and is characterized in that a discharge opening of the feeding device is provided with a dust shield device for preventing dust from being discharged from the machine case; an airflow forming device is arranged below the crushing cavity, an air guide device is arranged above the crushing cavity; the airflow forming device generates rising airflow in the crushing cavity, the airflow and the meeting dust in the crushing cavity form dust flow, the air guide device forms a negative pressure area above the crushing cavity so as to guide a large amount of dust flow in the negative pressure area, and in this way, the dust can not be discharged from the discharge opening due to the blocking of the dust shield device but only can be discharged from the machine case by the air guide device; the air guide amount of the air guide device is adjustable, and the dust content of the aggregate in the crushing cavity is controlled by adjusting the air guide amount. The dust removing effect and the control of dust content of the crushed aggregate are realized by adjusting the air inlet amount and the air guide amount of the crushing cavity so as to realize the adjustable aggregate fineness modulus.

Description

technical field [0001] The invention relates to the field of crushers, in particular to an impact crusher capable of adjusting the fineness modulus of sand and gravel. Background technique [0002] Impact crushers are widely used in sand and gravel production lines, metallurgy, coal mines, mineral processing, building materials and other industries. Motor and other components. The stones fall vertically into the high-speed rotating rotor from the upper part of the casing. Under the action of high-speed centrifugal force, they collide with another part of the target stones that are shunted around the turntable in an umbrella-shaped manner to produce high-speed impact and high-density crushing. The stones are colliding with each other. Finally, the material layer between the rotor and the casing will form a vortex for multiple impacts, friction and crushing, and it will be discharged from the lower discharge hopper. A closed circuit is formed for multiple cycles, and the par...

AI Technical Summary

Problems solved by technology

The cost of vibrating screen screening method is low, but the large amount of dust contained in the crushed sand by the crusher is easy to block the screen, and the screening efficiency is low; in order to ensure the final sand production, it is necessary to increase the width of the screen, thereby increasing the cost , another screening method is to use air screen screening, which has high screening efficiency, but the equipment is expensive and the production cost is high

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