As early as the early 1950s, high-frequency vibrating screens were developed abroad. At present, the countries that own this technology in the United States include the United States, Australia, Germany, France and Finland, and their products are also diversified. The high-frequency vibrating screen produced abroad has the advantages of large processing capacity, high efficiency, stable performance and long service life, but the disadvantages are mainly expensive, small processing volume and low cost performance. The most typical ones are the American Drake High Frequency Screen, the Welkau Dewatering Screen and the SD Type High Frequency Vibrating Screen. Derrick's high-frequency vibrating fine screen Derrick high-frequency vibrating fine screen was invented by Derrick in the United States in 1951. Its structural features: (1) High frequency, low amplitude (60Hz, 0.8mm) is adopted, and the positive inclination angle and the large inclination screen surface (>30°) are adopted, and the screen surface has high transportation capacity. (2) The sieve machine has three independent sieve faces, which are separately fed, and the processing capacity is 1.5 times larger than that of the single-point feed sieve while maintaining the same screening efficiency. (3) The structure of the sieve chute is unique in that it does not hinder the sieve water falling from the middle and the discharge end screen into the sieve water funnel of the sieve machine. (4) The exciter is mounted on the upper part of the screen box to generate a 60 Hz excitation force. And laminated metal wire woven mesh, clogging, reduced cleaning frequency. Welco dewatering screen The Welco dewatering screen produced by Linnatex Company of the United States has the following structural features: (1) The slurry from the feed tank is fed almost vertically. (2) The inclination angle of the screen surface of the feeding end is >45°, the main screen surface is installed at a negative inclination angle, and the entire screen surface is in a V-shaped state. (3) The front end of the feed end screen surface and the main screen surface adopts a wedge-shaped slit screen surface, and the discharge end end adopts a polyurethane sieve plate, and the sieve joint gradually increases from the feed end to the middle portion to the discharge end. (4) Two motors are installed on the load-bearing beam of the screen box. Adjust the eccentric weight on the shaft extension of the motor to adjust the amplitude. In addition, the discharge end is provided with a seesaw to adjust the thickness of the material layer on the screen surface. . SD type high frequency vibrating screen The SD type high frequency vibrating screen produced by Conway of the United States has the fastest development and the widest application. At present, this type of high frequency vibrating screen has a minimum width of 0.9 m and a maximum width of 1.8 m. Its main features: (1) The screen surface is installed at an angle of -5°, the amplitude is 3mm, and the vibration frequency is 1474r/min. Due to the climbing of the material on the screen, the material on the screen has a certain thickness. Therefore, it also acts as a filter, so that the moisture of the material is low and the particle size retained is smaller. (2) The special G-MASTEF shaker or vibration motor is used, and the screen surface is made of polyurethane or stainless steel. (3) It can provide a variety of products, the sieve body is simple in structure, convenient in maintenance, long in service life, large in processing capacity and high in efficiency. Research Status of High Frequency Vibrating Screen in China In China, the development of high-frequency vibrating screen technology polyurethane screens is relatively late. Until the end of the 1970s, a small amount of high-frequency vibrating screens were introduced only in the metallurgical system. The real development and testing began in the early 1980s. Currently, high-frequency vibration sieve of selected coal industry used widely. According to the situation reflected by the market, there are about 100 high-frequency vibration dewatering screens per year, and the economic and social benefits are very significant. Therefore, many excellent enterprises have emerged, and the domestic high-frequency vibrating screen market is highly competitive. GPS series high frequency circular vibrating screen GPS series high frequency circular vibrating screen polyurethane screen, mainly used for the recovery of fine coal slurry, working at 50~60Hz frequency. (1) The screening machine is a coal slime screening and grading device which is carried out in a thin layer and which is classified by a precise sieve. (2) Working according to the principle of circular vibrating screen, with high frequency and high vibration intensity. (3) The composite screen surface of the “sandwich†screen on the screen surface has an opening ratio of up to 36%, and the anti-blocking effect is very good. GZ, GZT type high frequency linear vibrating screen high frequency linear vibrating screen is divided into GZ type high frequency vibrating screen and GZT type low noise high frequency vibrating screen. The difference between the two is that the GZ type high frequency vibrating screen vibrator is a unit combination type, and the screen frame is an integral welded structure; the GZT type low noise high frequency vibrating screen vibrator is a box type, and the screen frame adopts a sandwich type side wall. And beam, with noise reduction. (1) According to the principle of self-synchronization, the vibrator is driven by two motors separately, and there is no forced connection between the two transmission shafts. (2) The screen surface is composed of an arc segment and a straight line segment with a negative inclination. The slit of the arc segment is perpendicular to the direction of movement of the material, and the noodle seam of the main sieve is in the same direction as the movement. The basic principle of QZK series curved screen QZK series curved screen is similar to that of GZ type, but the screen surface overcomes the disadvantage of excessive GZ type. The screen surface is generally made of stainless steel step welded sieve plate or composite sieve plate. At present, this technology has the fastest development. This type of sieve machine has the advantages of low moisture content (≤24%), high processing capacity and high solid recovery rate. At present, QZK-2041 is the largest model for domestic application, which is the world's largest high-frequency dewatering screen. This type of sieve machine adopts a block eccentric vibrator and a grease-lubricated structure, and its disadvantages are mainly that the lower limit of the screening is limited, and the processing capacity per unit area is low.
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Foreign high frequency vibrating screen