Sand and stone production line – screening and washing equipment flow analysis

The screening and washing of sand and stone production line is to divide the sand and stone into several grades according to its particle size and wash the soil mixed with it. There are two kinds of screening operations: manual screening and mechanical screening.

(1) manual screening device

Three layers of screen with hanging rod and catenary hanging on the screen frame, change the length of catenary, can change the screen inclination. The aggregate is loaded by a hopper equipped with a screen strip on the top of the frame. The overdiameter stone is removed, and the rest of the aggregate falls on the screen. With both feet repeatedly step on the rocker mechanism of the pedal. The screen is reciprocating shaking, the aggregate for screening.

(2) screening machinery

Widely used screening machinery is the plane vibrating screen machine. Which has the advantages of high productivity, high classification accuracy, less energy consumption, small size of equipment and so on. Plane vibrating screen according to the different vibration mode. It can be divided into two kinds of eccentric vibrating screen and inertial vibrating screen. Eccentric vibrating screen screen frame is mounted on the eccentric spindle, the eccentric shaft drives the screen frame for circular motion to produce vibration. Its characteristic is that the amplitude is stable, not because of the amount of aggregate on the screen changes, and is not easy to plug the sieve hole; Suitable for large and medium stone screening. The vibration of the screen is caused by the inertial centrifugal force generated by the eccentricity of the rotating spindle. When the amount of aggregate on the screen changes, its amplitude will change with the size of the deformation of the damping spring. The disadvantage is that it is easy to plug the screen when feeding too much. Suitable for medium and small stone screening.

On the screen surface of the plane screen machine. There are several rows of pressure water pipes with sprinkler holes, and at the same time, the aggregate can be washed.

(3) The commonly used sand washing equipment of the spiral sand washing machine is the spiral sand washing machine.

In the chute of sand washing, there is one or two long rotating axes with spiral blades. The fuselage is placed at an inclination Angle of 18° ~ 20°, with sand at the low end and water at the high end. Due to the rotation of the spiral blades, the washed sand is stirred and moved to the high end outlet. The washing water is piped in and the sewage is discharged from the lower drain. The spiral sand washing machine has simple structure, reliable work and wide application.