In recent years, semi-continuous mining technology has been widely used in large open-pit coal mines. In this mining process, mineral sizers are the key equipment. Since the 1970s, many domestic coal mines have had to change the mining process due to the lack of such equipment, which has increased the mining cost. The development of large-scale double-toothed roller semi-mobile crusher can not only provide reliable and efficient equipment for open-pit coal mines, meet the requirements of semi-continuous mining technology, but also fill the gap in the design and manufacture of mobile (semi-mobile) crusher in China, so that the level of manufacturing crushing equipment in China has increased to a new level. The new double-toothed roller crusher has the advantages of light weight, small volume, low machine height, large feeding size and large crushing ratio. It is an ideal equipment for semi-continuous mining in various open-pit coal mines. The research of new mineral sizers in our country has just started and is still in the stage of form-copying design. The calculation of power is the key link in the design of crusher, which is directly related to the success or failure of the subsequent design.
Since many parameters of the crusher are related, mineral sizers are manufactured according to the principle of similarity. The simulated crusher can be equipped with two kinds of tooth rollers: four tooth rollers and six tooth rollers, and the center distance of the tooth rollers can be adjusted. Through the bench test of the experimental machine, it can be determined which formula is used to calculate the power of the new mineral sizers and the coefficient in the formula. The installation of experimental system equipment is shown in Figure 2. Each crushing test material 200kg material composition: D=0~25mm material 40 kgD=25~40mm material 60kgD=40-80mm material 60kgD> 80mm material 40kg. Manually pour the prepared material into the crusher bin, place the receiving box under the machine, start the crusher, adjust the given speed of the inverter, open the test system at the same time, manually quickly open the gate under the silo to start the time, test and record the speed, power, torque and other parameters 1 after stopping, weighing the broken product. The tooth roller was replaced, the center distance of the two rollers was adjusted, and the second test was carried out. A total of 9 tests were carried out. The discharge particle size is directly related to the calculation of power and actual power consumption, so when testing torque and rotational speed, the crushed products are screened and weighed, and the screening test data are fitted with curves, so that the discharge particle size distribution function of each test and the particle size d when the cumulative percentage under the screen is 80% can be obtained. The parameters and results of each measurement are recorded in Table 1. According to the derived power calculation formula (3), the calculated power of each experiment can be calculated: N calculation =WH×Q, which is also listed in Table 1, where Q is the production capacity. In the calculation of WH, because the material with particle size below 80mm accounts for 80% of the total input, mineral sizers discharge particle size D=8×104μm Work index m Iron ore =8.81kW·h/t m limestone =9.35kW·h/to.