A device structure
In order to have a comprehensive understanding of the structure of the vibrating nylon fine screening equipment, the structure of the Yili vibrating fine screen is first described. The prototype of Yili company consists of a feeding tank, a screen surface, a tapping device, a product receiving tank, etc. (see Figure 1 for details).
The ore tank is required to maintain a constant pressure in the tank (usually using an automatic watering device), and the ore is uniformly and smoothly applied to the sieve surface. There is a core-cutting piston in the box, which is used to interrupt the feeding of each sieve. Below the hole is a neck, which can be adjusted to the mine mouth. The size of the mine mouth determines the amount of slurry in the fine sieve. There is an active feeding plate under the mine mouth, which uniformly feeds the sieve. The slurry flows out of the feeding tank, flows to the feeding plate, and then flows to the fine sieve surface, which is divided into sieves and sieved two products. The striking device is the only moving piece that is rhythmically struck on the screen frame of the fixed screen. The screen surface is the main component of the fine screen. Generally, it is made of stainless steel sieve strip, the width of the sieve strip is 1.6mm, the sieve hole is 0.1mm, it is a trapezoidal section, a 600~1200mm sieve surface, about 760 sieve strips are formed, forming 760 long slits, size It is a 0.1 mm sieve hole.
Erie says its beating device is the key to the success of the screening equipment . Figure 2 shows the tapping device designed by Erie. The striking device comprises: the lifting arm is mounted on the rotating shaft, which can lift the hammer mounted on the same shaft. When the hammer is raised to a certain height, there is a fixed wedge to force the hammer to disengage from the lifting arm, so the hammer is freely downward Swing and tap on the striker of the screen frame. A shaft can be linked to several side-by-side tweezers, as long as the shaft is extended and a small hammer and lifting arm are added to each sieve. [next]
As far as the current vibrating device is concerned, it can be divided into two categories: one is the above-mentioned striking device, and can be a mechanism such as a mechanical cam, a spring, a solenoid, or a pneumatic piston structure. Pneumatic devices are reported to be reliable. The other type (see Figure 3) is a two-vibration motor mounted on a screen in Germany and other countries, controlled by an adjustable time relay. When the vibration motor operates, centrifugal force is generated perpendicular to the direction of the screen surface, causing high-frequency vibration of the screen surface in the screen body, thereby removing the clogging of the screen hole, and after a short time, the screen surface returns to the original static state.
Both types of vibrating devices cause sudden high-frequency vibrations caused by the sudden action of the screen surface. Therefore, the method of joining the screen surface to the screen frame and the method of joining the screen frame and the screen body with the screen surface are notable. Some use urethane as a cushion (Erie), and some use a soft rubber buffer (Germany).
The fine screen is generally different from the ordinary screening machine. It is installed at a large inclination of 45° to 65°, especially 55° to 60°.
The fine vibrating nylon fine screen developed by China is shown in Figure 4. It is mainly composed of a feeding device 1, a nylon sieve screen 2, a striking device 3 and the like. The ore is required to be evenly distributed and the slurry is smoothly fed to the sieve surface. According to the difference in particle size composition of the ore, the structure of the ore box is slightly different, so that the slurry does not precipitate in the tank. Nylon-like fine mesh surface has three characteristics: (1) made of nylon 1010 raw material. It has been tested with raw materials such as polyvinyl chloride, nylon 6, MC nylon 6, and reinforced nylon, which are not as good as nylon 1010; (2) braided structure type (stainless steel fine screen is strip structure); (3) injection molding process. The casting molding (MC nylon 6) method has been used, the molding cycle takes 8 hours, and the injection molding cycle only takes 1.5 to 3 minutes. Each sieve plate consists of 50 sieve bars, and the mesh holes are 0.15 mm, 0.20 mm, 0.30 mm, etc. Several. Compared with stainless steel fine screen, nylon fine screen has the advantages of low price (1/8 of the price of stainless steel fine screen), easy to block the mesh hole and long service life. Moreover, its molding ability is large, and an XS-ZY-500 horizontal injection machine can meet the demand of about 60,000 sieve plates per year in the country. The striking device is composed of a motor, a reduction gear box, a cam, a pressing rod and a hammer. The motor drives the reduction gear box to rotate the cam mounted on the low speed shaft, and the rotating cam lifts the hammer by the pressure rod, and the cam strikes once every one rotation of the cam. A tapping device can drive 25 sets of 400×1200mm fine screens.
The technical characteristics of the 25 (unit) units are as follows:
Screen size 400~1200mm×25 sets Screen size 0.2(0.15,0.30)mm
Under the sieve -200 mesh content 95%
Feed concentration 35~45%
Hammer weight 1kg/set Number of beats 6~16 times/min
Dimensions 13.3 × 2.8 × 2.6m
Screen angle 50°～60°
Separation particle size 0.074 (0.063, 0.10) mm
Processing capacity 120～195t/(group · h)
Under screening yield 50%
Beating height 200~250mm
Motor power 3kW
Weight 5.7t[next]
1984, Dagushan beneficiation plant to strike a fine screen vibrating apparatus has been improved, high frequency (3000 times / min), small amplitude (0.75mm) of electromagnetic vibration, secondary magnetic separation plant graded series 5 test. After more than one year of continuous operation, the equipment is operating normally. Under the similar production conditions, the secondary classification efficiency is increased from 40% to 60%, the secondary circulation load is reduced by 30%, and the grinding grade is reduced by 10%. The selection of the road sorting operation (mixed product of cyclone overflow and fine sieve) increased by about 3%. Fig. 5 is a configuration diagram of re-grading the grit of the secondary grinding cyclone by the high-frequency electromagnetic vibration nylon fine screen.
Fen Township eighteen annual processing capacity of a small magnetic iron ore concentrator 200 000 t of 1986 production, concentrate grade of around 62%, due to changes in market demand, requiring more than 65% of the output of high-grade ore Therefore, a high-frequency electromagnetic vibration nylon fine screen was added, and a 75mm (3in) sand pump was added. The single magnetic separation process was a magnetic separation fine screen self-circulation regrind process, which made the concentrate grade reach 66% or more, satisfying the market. Need. The process after the transformation is shown in Figure 6.
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