A brief introduction to picks

Pick consumption decreases with increasing shearer traction speed and increases linearly with drum speed. The reason is that with the increase of traction speed, the chip thickness of the pick increases, and the path for cutting coal and rock per unit volume becomes shorter, resulting in less pick wear and lower tooth loss. However, as the rotation speed of the drum increases, the contact time between the pick and the coal will become longer, resulting in increased pick wear and increased loss.

The consumption of the pick increases with the increase of the diameter of the drum and decreases with the increase of the width of the drum. This is because when the diameter of the drum increases, the number of teeth in contact with the coal and rock increases, resulting in increased wear and loss of the cutting teeth; an increase in the width of the drum means an increase in the productivity of the shearer (with constant traction speed, etc.) . Therefore, the picking consumption per unit output will be reduced.

The number and arrangement of the picks mounted on the drum also have some effect on the cutting process. The number of picks and the time constant of the contact between the picks and the coal wall are related to the arrangement of the picks and the height of the drum cutting coal. The impact on the consumption of picks is that the more picks on the drum, the more picks are involved in cutting, so the loss of picks is greater; but the longer the picks are in contact with the coal wall, the greater the wear, which increases consumption of picks. Therefore, do not install too many picks on the drum, and avoid the situation where the drum cutting height exceeds its diameter.

During the cutting process, the force exerted on the pick also has a great influence on its wear. The relationship between the traction resistance (or feed force, which is equivalent to positive pressure) and the consumption of the pick is proportional, that is, the greater the force acting on the pick, the greater the wear and the more consumption. Drawing Because the cutting resistance of the pick is linearly related to the traction resistance, the consumption of the pick increases linearly with the increase of the cutting resistance.