GPS-800×1680 high frequency fine screen

The GPS-800×1680 high-frequency fine screen system was developed in the early 1980s, and its structural properties are as follows.
Structure
The GPS-800×1680 high-frequency fine screen structure is shown in the figure below. Mainly composed of sieve frame, sieve surface, counterweight wheel, sieve discharge outlet, sieve discharge outlet, rubber spring, frame, motor and so on.

Screen frame: welded by steel plate and steel pipe, and welded with ribs.
Screen surface: composed of 28 nylon sieve plates with a mesh opening of 0.15mm; the sieve surface is fixed on the screen frame with square wood strips and wedges for easy replacement. The sieve surface is divided into two ways to feed the ore, and the discharge end of the sieve is provided with first and second screen upper discharge outlets and a lower sieve discharge outlet.
Counterweight wheel: The function is to generate an exciting force to make the sieve vibrate in a straight line. The magnitude of the excitation force and amplitude is adjusted by adjusting the number of counterweights.
Rubber spring: reduce the dynamic load on the foundation when the sieve is working.
Rack: The entire screen frame is connected to the frame by rubber springs, and the front and rear frames can be adjusted to the upper and lower positions to change the inclination of the screen surface.
Motor: Two motors are installed on two bases. [next]
The vibration (system) of the high-frequency vibrating fine screen is composed of the vibration mass (the mass of the box and the exciter), the spring and the exciting force (generated by the eccentric block on the rotary shaft), in order to ensure the high-frequency vibrating fine screen operation. Reliable and stable work, the vibration system is calculated to simulate the vibration quality, spring stiffness, mass moment of the eccentric mass and amplitude, reasonably select the spring stiffness and determine the mass moment of the eccentric mass.
2. Working principle
The working principle of the high-frequency vibration fine sieve exciter is shown in the figure below. The mass of the eccentric mass on the two axes is m1=m2, the centrifugal force F is equal, and when the eccentric block is synchronously rotated in the opposite direction, the force components of the centrifugal force along the y direction (vibration direction) are always superimposed on each instantaneous position. The x directions cancel each other out, which creates a single exciting force in the y direction that drives the screen for direct vibration.

In the above figure, the centrifugal force is superposed at the positions a and c, and the exciting force is at most 2F; the centrifugal force is offset at the positions b and d, and the exciting force is zero. Since the exciting force is at a 30 degree angle to the screen surface, the throwing angle of the material on the screen surface is 30 degrees, and the material is loose when it is thrown up. When the material meets the screen surface, the water and the particles smaller than the mesh hole are sieved. Thereby achieving grading.
3. Main technical parameters
The main technical parameters of GPS-800×1680 high frequency fine screen are:
Effective screen area 1.2m ²
Screen size 0.15mm
Screen angle 15°～25°
Full amplitude 0.6~2.2mm
Vibration times 2860 times / min
Motor power 2 × 2.2kW
Total weight 925kg
Dimensions 2.7×1.4×3.2m[next]
Application Example 4. Iron processing plant in accordance with the test for Small Waitoushan iron ore, and industrial test results obtained are summarized Obliquities screening efficiency and screening machine, amplitude, processing of ore, the ore concentration to between mathematics model.
E=235.015-2.6932a-196.165L-0.7225Q-0.4117C+0.0506a2+95.8105L2-0.0028Q2+0.0015C2+0.003aLQC
Where E - screening efficiency, %;
A—the inclination of the screening machine, degrees;
L ———the amplitude of the screening machine, mm;
Q———the amount of ore given by the screening machine, t/h•m ² ;
C———The concentration of the ore given to the screening machine, %.
Production inspections were carried out in 1985 and compared with fixed fine sieves. When the dip angle of the high-frequency fine screen is 15 degrees and the amplitude is 0.7 mm, the average indexes of the high-frequency fine screen and the fixed fine screen are listed in the following table.

The data in the above table shows that the mass efficiency and mass efficiency of the high-frequency fine sieve are higher than that of the fixed fine sieve, and the treatment amount per unit area is 3 to 5 times higher. The product on the high-frequency fine sieve (return to the ball mill and re-grind) has a fine iron grade ratio. The sieve is 3 to 4% lower, and the iron grade of the product under the sieve is also about 2% lower. This is because the feed size is too fine (-200 mesh accounts for about 80%), the mesh size is large (0.15 mm) and the vibration is strong.
Tests show that the screening efficiency and throughput of GPS-800×1680 high-frequency fine screen are high. When the concentration of ore is 55~56%, the treatment volume is 6.62t/h•m ² , the screening efficiency is 96%; the treatment volume is 15.51t/h•m ² , the screening efficiency is 73～82%; the treatment volume is 23.03 t/h•m ² , the screening efficiency is 67 to 78%.

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