The coal washing machine is responsible for the normal and balanced production of the mine and transportation department, and is set up with a certain capacity coal bin. The coal storage bin is designed to regulate the imbalance between production, transportation, and sales, inherit the production of waste coal, ensure the smooth delivery of coal, and enter the final loading stage. Heavy medium coal selection is usually graded and selected. The advantage of heavy medium coal selection by coal washing machines is that it has high sorting efficiency and a wide selection range compared to other coal selection methods, The feed particle size of the sorting machine is 1000-6mm, and the swirler size is 80-0.15mm. The production control is easy to automate. The coal preparation equipment utilizes the differences in physical and physicochemical properties compared to other substances. The impurities mixed in the raw coal are mechanically removed in the coal preparation plant, and it is divided into products with different quality and specifications to meet the needs of different customers.

　　Coal preparation machinery requires crushing large blocks that exceed this category in order to be washed. The main body of mine surface production, including coal processing, gangue treatment and punishment, material and configuration transportation, constitute the coal washing equipment of the mine surface system. Coal washing machines can be divided into mine preparation plants, group mine preparation plants, intermediate preparation plants, and user preparation plants based on the location of the preparation plant and the coal mine. Most of the existing coal washing plants in China are mine washing plants, The modern coal washing plant is a continuous and rigid processing process composed of many operations, with hydraulic jigging being the most common in coal preparation. The selection of coal particles that can be punished by the coal washing equipment has a certain degree of scope.

　　The complete set of coal washing equipment jig forms a layer of material layer on the sieve plate, that is, the jigging bed layer. The middling coal coal and clean coal with broken gangue and various ash powders in the raw coal are sent into the coal washing machine through the conveyor belt. Effective layering and separation is the work completed in the jigging room. When the jigging process of opening and closing the air valve of the coal washing machine is repeated from time to time, it has long been affected by the horizontal water flow, Adding less than half of the inclination angle will keep the bed moving forward while pulsating up and down. Layering is achieved through the continuous improvement of coal washing machine technology, until high-density gangue falls at the bottom; When it falls on the gangue layer, the motor of the gangue of the coal washer drives the discharge wheel to discharge the smaller gangue from the gangue discharge outlet, and then it moves to the next aggregate bed through the middling coal overflow weir. The middling coal discharge outlet uses the motor to drive the clean coal with the smallest density. The coal seam on the bed moves with the water flow. This is the process of separating the gangue and dust coal.