Application of Hammer Mills New Zealand

Hammer mill is widely used in large and medium-sized coking plant.
Hammer mill mainly is composed of the rotor, hammers and fixed frame, grate and regulation devices and shell. The shaft of the rotor is fixed between the two bearings on the bracket and is driven by an electric motor. On the outer edge of the rotor, there are ten rows of hammers arranged equidistantly on each axis, with 7 hammers of almost equal weight link. When the rotor rotates at a high speed, the hammer extends outward in the radial direction, resulting in a large kinetic energy, namely a crushing force. Grates are made up of a lot of parallel arrangement, grille gap can be adjusted, generally 30-50mm, due to grate spacing varies, grate number is different. The grate is arranged on two sides, and is arranged on the frame. The position of the frame can be adjusted by the frame adjusting mechanism. One end of the frame is hung on the hinge and the other end is fixed on the ring of the lifting device. The lifting and lowering of the grate is manual. When adjusting, the hand shake is set on the outside of the body by the hand. The distance between the grating and the hammer can be adjusted by the eccentric wheel to raise or lower the frame and grate granularity.

Material crushing mainly rely on high-speed rotary hammer produced by the kinetic energy (impact) to complete. All is light hammer head for the coking plant, the peripheral speed is usually 25-60m / s.

Hammer mill production capacity correlates with the physical propertie the material to be processed, the required crushing ratio, the rotor speed, the weight and the number of hammer and material uniformity and other factors.
The diameter and speed of the rotor have a great influence on the production capacity. When the other conditions are the same, the production capacity is proportional to the diameter and the square of the speed. Crushing ratio increases, the production capacity is reduced, which is because the crushing more energy consumption.

The fineness of the product is mainly controlled by adjusting the distance between the grating and the hammer and changing the hammer. Crushed by the smashing of the coal part of the grate by the gap was pressed out, but the main part is discharged through the window, the grinder rotary gate can be mixed into the coal mixed with iron; when the crushing fineness is not high, you can open to change gate, reducing mill load, increase production capacity. Coal fineness and moisture directly affect the production capacity of the mill, when fineness and moisture increases, the rapid decline in production capacity, power consumption greatly increased.

When the crushing fineness is a certain, the water increased, grate spacing will increase to prevent the grate block. According to many plant operating experience, increasing the spacing of grate, grate is not easy to plug, grinder production capacity increased, but the crushing fineness is reduced.