1. Two-way semi-helical multi-layer multi-feed vibration vibrating fine screen The fine screen developed by Northeastern University in recent years is shown in Figure 1. It consists of a body, a vibration isolation spring, a vibration motor and a machine base. The machine body is composed of a feeding port 1, a feeding box 2, a box body 4, a reinforcing rib 5, a partition 6, a column 8, a coarse material discharging port 13, a fine material discharging port 14, and a chassis 15. They are connected to each other by welding. The two-way semi-spiral box 4 has 4 layers from top to bottom, and is equipped with a plurality of fan-shaped sieve plates 3, and the wooden wedges 7 are pressed to form an 8-way sieve surface. The motor base 9 is connected to the chassis by bolts, and two vibration motors 11 having the same characteristics are symmetrically mounted on the motor base. Together with the whole body vibration motor located in the coil spring 12 of gold on the base metal 10. When two vibrating motors are synchronously reversed, the exciting forces in the horizontal direction cancel each other, and the exciting forces in the vertical direction are superimposed on each other, so that the material on the spiral surface is thrown to realize the classification of the materials. Multi-layer multi-feed vibrating fine screen is an innovative mechanism with simple structure, easy manufacturing, installation and commissioning, few maintenance points, high classification efficiency, large processing capacity, and weight compared with flat vibrating fine screen of the same area. Light, small footprint and so on. Fine material suitable for wet classification, beneficiation plant may be substituted in the double spiral classifier and a fixed ball Sec fine sieve and closed-circuit grinding composition, may be implemented strictly accurate classification by size, to reduce the load of grinding cycle, reducing excessive wear, improved precision The grade of the mine is of great significance.
2. Rotary vibrating screen The S49 type vibrating screen has a total of 6 specifications. It is manufactured by Xinxiang Binhe Vibration Motor Industry Co., Ltd. It can be used for dry or wet screening of fine and fine grain materials.
The structure of the vibrating screen is shown in Fig. 2. It usually has three sieve faces, and the mesh size is reduced from top to bottom, and the material can be divided into four grades, which are respectively discharged from four discharge ports. The vibration motor is used as a source of excitation and is a major component of the vibrating screen.
The upper and lower ends of the vibration motor shaft are provided with upper and lower eccentric weights. When the vibrating motor rotates, the vibrating part of the screen machine moves in three directions in the horizontal and vertical directions, so that the material can be smoothly and continuously graded. By adjusting the phase angles of the upper and lower eccentric weights, the movement trajectory and residence time of the material on the screen surface can be changed, so that the best screening state can be obtained when sieving different materials. In order to avoid clogging of the screen hole, a bouncing ball is arranged under the screen surface.
The S49 type vibrating screen produced by Xinxiang Binhe Vibration Motor Industry Co., Ltd. is an improved third-generation product. Its advantage is that it is convenient to load and unload the screen. It can be used with any mesh of 2-235 mesh. The screening efficiency is high and can Low consumption, fully enclosed structure, no dust pollution environment. The technical performance of the vibrating screen produced by the factory is shown in Table 1. The shape and installation dimensions are shown in Figure 3 and Table 2. At present, some manufacturers such as Xinxiang City Vibrating Screen Machine Factory produce this kind of vibrating screen.
   figure 1  Figure 2, 3
   Table 1  Table 2
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