The sieve size of the rotating probability sieve is also much larger than the graded particle size, and the material is sieved according to the probability principle under the centrifugal force of gravity and the rotation of the screen surface. In 1984, China had been successfully designed by the Tangshan Branch and manufactured by Huai Mine. The XGS-type rotating probability sieve was constructed in Figure 1. The sieve is mainly composed of three parts: a feeding tray, a screening disc and a discharge tray, and all three discs rotate at a low speed. The sieve tray consists of a number of cantilevered stainless steel screens. The sieving material is continuously and evenly fed into the rotating sieve surface through the disc with the spiral feed plate, the fine particles are sifted through the slit of the sieve, and the coarse particles are removed from the sieve surface by the centrifugal force of the disc. . The on-screen product and the under-sand product are respectively dropped onto the discharge tray and scraped into the chute by the scraper.
The size of the fractional particle size depends on the height between the feed tray and the screening tray, the size of the screen and the speed of the sieve tray. Adjusting the speed of the sieve tray during operation can control the graded particle size, which is a unique advantage of the rotary probability sieve. Because the sieve joint is wedge-shaped, the inside is small and large, and the probability is sieved. The size of the sieve joint is much larger than the classification granularity, so the sieve hole is not easy to be blocked, and is especially suitable for the drying of difficult-to-screen coal with fine grain size, high water content and high viscosity. Grading. And the screen has good dustproof sealing performance, low noise and no vibration.
The Qishan Coal Mine of Xuzhou Mining Bureau used a rotating probability sieve with a diameter of 2.4m. Its processing capacity is 100~150t/h, which replaces the original three 9m2 linear vibrating screens, with an annual profit of more than 1 million yuan. Moreover, it can be used for the classification of raw coal with high water content. It can still be classified according to 6mm when the moisture reaches 14%, and the technical index reaches the level of similar foreign probability sieve.
The performance of XGS type rotary probability sieve technology produced by Huai Mine is listed in the following table. The shape and installation dimensions are shown in Figure 2.
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