Shaking table belongs to gravity ore dressing equipment, developed from plane chute, later characterized by its asymmetric reciprocating motion and self-contained system. Shaking table is composed of three main parts: bed fennel, frame and transmission mechanism, bed surface is trapezoidal or rhombic, in the transverse direction there is 1. ~ 5. tilt, in the tilt above the configuration of the feed chute and the feed chute, the bed surface along the longitudinal arrangement of bed strips, and the height of their height is lowered from the end of the transmission to the opposite side. The whole bed is supported by the frame, and a transmission device is installed at one end of the bed, the latter can make the bed have a sharp return movement characteristic when the bed front approaching the end, that is, the so-called differential movement. 

    Shaking table is the separation of fine-grained ores commonly used beneficiation equipment, processing metal ores when the effective selection of particle size range is 3 ~ O.019 mm, coal can be up to 10 millimeters when the upper limit of particle size. The outstanding advantage of shaking table is the high accuracy of sorting, after a sorting can get high grade concentrate or waste tailings, and can be connected with more than one product at the same time. Plane shaking table is easy to look after and convenient to adjust. The main disadvantage is that the equipment covers a large area and the processing capacity of unit plant area is low. 

     Shaking table application has nearly 100 years of history, the initial shaking table is the use of impact caused by asymmetric reciprocating motion of the bed, made in 1890 for coal beneficiation. Mineral processing shaking bed is 1896 - 1898 by A. Wilfley (Wilfley) made, using eccentric elbow plate mechanism. 1918 Plat-O (Plat-O) and cam lever made of another transmission mechanism. These two shaker head structure has been improved and is still in use today. After the second world war Germany made the eccentric wheel drive fast shaking bed. China in 1964 developed a successful inertia spring shaker, has been popularized in the production application.  

   In order to solve the problem of shaking bed covers a large area. Bed facing the direction of multi-layer and centrifugal development. 50's China made a double layer shaking bed, four layer shaking bed and six layer sludge shaking bed, but because of the inertial force of the bed is difficult to balance and not permitted to wide, the former Soviet Union had developed a duplex three layer shaking bed. Britain in the 60's with glass fiber reinforced plastic bed made of double and triple shaking table, each bed have a separate transmission mechanism. West Germany in order to solve the coal processing plant large handling capacity requirements, the construction of multi-layer configuration of the tower. These multi-storey structure shaking table still inherited the original seat type installation, can not be set on the floor in large quantities. 

    In 1957, the United States first developed a multi-eccentric inertia gear bed, then made of multi-layer suspended shaking table, is a major innovation in the structure of the shaking table. 1975 China also made this shaking table, and has been applied to the production. 

    Centrifugal shaking table is made of bed surface arc, more bed surface surrounded by a cylinder, along the axial slit, in the vibration at the same time and in the rotary movement by centrifugal force to strengthen the selection process. In the industrial test obtained a good sorting effect, but because of the complex structure and has not been popularized.  

     China in 1913, the introduction of Wei type shaking table, there are a large number of shaking table for separation of tungsten, tin, niobium, tantalum and gold-bearing ores, only the cloud tin company has applied 1784 sets of shaking tables (1986), the output of commercial tin concentrates accounted for about 86% of the total. Foreign countries are also more selective with shaking bed coal (iron sulfide), but in China's coal plant applications are not much, Table 11.5.1 lists the types of shaking beds applied in China. 

    Classification of mineral processing shaking table 

    The type of shaking table is mainly according to the bed head, bed surface, support mechanism and the combination of slope adjustment device to distinguish. China's industrial shaking table classification as listed in table 11.5.1. In addition to this can also be based on other structures, application of different classifications. 

     According to the configuration of the bed surface has a left-type and right-type points. Standing at the head of the bed to see the bed, if the feeder tank in the left that is the left-type shaking table, in the right that is the right-type shaking table; 

    According to the way of installation, there is a difference between pedestal type and hanging type.  

    According to the number of layers of waste surface, there are single-layer shaking table and multi-layer shaking table.  

    According to the processing of different raw materials, there are shaking table for mineral processing and shaking table for coal processing.  

    According to the processing of ore particle size has ore (2 ~ 0.2 mm) shaking table and mud (O.2 mm) shaking table points. Ore shaker can be further divided into coarse sand (2-0.5 millimeters). 

    Shaking table and fine sand (O.5.-0.2 mm) shaking table. 

    Bed surface is the working surface of sorting. The shape of trapezoidal, rhombus, etc., our country almost all use trapezoidal bed, the advantage is that it is easy to configure. The trapezoidal bed surface of the triangular mineral-free belt cut down to the lower tailings side will constitute a rhombic bed surface, can effectively utilize the sorting surface and extend the sorting time, foreign coal shaking table is more often used. Comparison of the two bed shapes shown in Figure 11.5.17. 

     All beds are arranged with bed strips, bed strips parallel to the direction of transmission. But there is also a section of the middle of the arrangement into an inclined shape, become a wave-shaped bed (see Figure 11.5.18). In the inclined strip area of light minerals are easy to discharge, thus helping to improve the equipment capacity and increase the metal recovery rate. 

     Bed manufacturing materials are wood structure, fiberglass (glass fiber reinforced polyester resin) and aluminum alloy. Wooden structure bed surface to be laid with rubber, nailed to the top of the wooden bed strips or bonded plastic rubber bed strips. Yunxi company bed is coated with lacquer gray (lacquer and calcined gypsum mixture), and later changed to polyurethane formate rubber for coating. Wooden bed manufacturing time is long and easy to deformation damage. In recent years has been promoted fiberglass bed surface. The bed is a steel skeleton and fiberglass composite structure, the working surface coated with corundum resin wear layer. Bed can be directly in the bed surface modeling, light weight (300 - 350 kg), low cost, short manufacturing period is its advantages, is expected to service life in more than 10 years. Aluminum alloy bed surface is light in weight and flat on the surface.