Polyurethane sieve analysis sieve surface movement mode of ideal

Although the polyurethane screen mesh is divided into effect mainly depends on the properties of the material to be screened, but the same kind of materials by sieving equipment of different types can be obtained in the different screening effects. If the screening efficiency of the fixed sieve is low, and the words on the moving screen, the screening efficiency is associated with sieve surface movement form, in the sieve, the particles on the sieve surface close to the direction of vertical sieve is jitter, the higher the frequency, the screening effect is better; shaking sieve, granule along the screen surface sliding, because shaking sieve shaking frequency vibration sieve than low frequency, so the poor screening effect shaker; cylindrical screen by screen surface is easy to block, so the low screening efficiency. Therefore, should be based on material properties, a reasonable choice of types of vibrating screen, to maximize efficiency.

In order to improve the working efficiency of vibrating screen, also according to the actual situation, in the premise of satisfying product size requirements, as far as possible to choose the larger mesh size, large effective area, high sieving screen surface to open this L rate of non metal screen surface, and the appropriate choice of the mesh shape, in order to improve the screening of material particles ability and work efficiency.

The improvement of screen surface motion mode

The surface of the screen motion mode has great influence on the working efficiency of vibrating screen. Polyurethane screen that the ideal way for screen surface movement:

1) amplitude sieve dough material end in the vertical direction should be greater than the discharging end of the vertical amplitude. This is because people feed end has a larger vertical amplitude can make the end of thick layered material effectively, at the same time with the angle, so that the end of the excess material quickly to the screen surface middle spread, make fine materials in the material layer is relatively thin layered sieve through the screen surface, so as to improve the actual use efficiency; when the material reach the discharge end, material has good sub layer, then only need a smaller vertical amplitude can ensure the fine materials have good conditions for screening, vertical amplitude of too big but disrupted the screening of fine material environment.

2) along the screen length direction, from the beginning of human material end, material movement speed should be diminishing. This is because the movement velocity of material decline, can make the material layer to maintain a certain thickness in the screen surface, so that the fine material in the sieve surface layered relatively longer range through the sieve, sieve of the increase of the actual use of the area, at the same time, the screen surface along the length direction of the sieve sieve through volume tends to be uniform, give full play to the screen surface screening potential.

As in recent years developed a thick screen and double frequency vibrating screen, to overcome the ordinary vibrating screen the whole screening surface amplitude is a constant value and unit through the screen of the disadvantage of low ability, make the feeding end has the larger amplitude, discharging end and the ordinary vibrating screen has the same amplitude, thereby improving the working efficiency. Recently some scholars through or linear vibrating screen transformation of circular vibrating screen, get a new vibrating screen -- complex trajectory of vibrating screen, it has the advantages of simple structure, less power consumption, the work efficiency. The screen in human material end screen surface for circular motion, the central screen surface for elliptical motion, and make approximately linear arc movement in the discharge end, and along the long direction of sieve screen surface motion trajectory is pointwise changes along the length direction, sieve material velocity is decreasing. Not only improve the screening efficiency and work efficiency, and reduce the production cost, is an ideal mode of motion of sieve surface.

The use of non metal material by thin elastic sieve mesh as sieve based, very beneficial to improve the working efficiency of vibrating screen. This screen is generally used rubber or polyurethane materials processing, it can reduce the screening surface and the material to be screened between adhesion, make the material of two high frequency vibration, avoid the clogging of screen, reinforced material permeability, and can alleviate the material to be screened on the sieve surface mechanical effect, compared with the steel wire screen can withstand greater amplitude vibration the. Non metal screen has the following advantages:

1) improve screening efficiency. It can be improved about 20% than the metal screen screening efficiency.

2) good abrasion resistance, long service life. The average life expectancy is 25 times more than the metal screen.

3) reduce installation time. Improve equipment operation rate of D due to the non metal material mesh greatly prolongs the service life, reduce the screen surface change times, than the metal screen equipment operation rate is generally can be increased by 15%.

4) to reduce noise, improve the working environment. Metal mesh in the work with the exception of the sieve box resonance, mesh also generates some fibrillation, wear this kind of phenomenon is more obvious, fibrillation plus material on the surface of the case of steel collision and other parts, the high noise generated by the non metal material, screen the whole sieve plate as a whole, has a certain buffer action, can noise reduction of 20dB (A) about.

Reasonable selection of vibration motor and adjust the excitation force

Reasonable selection of polyurethane screen believe vibration motor is one of the key aspects affecting the screening performance, and the vibrating force is the main factor affecting the screening productivity.

1) the selection of vibration motor

Vibration motor as vibration source of the vibration sieve, should has the advantages of reasonable design, simple structure, compact structure, high efficiency, energy saving, exciting and convenient for installation and debugging. Selection of vibration motor, specific should choose the working frequency, the most exciting force, power etc.. Vibration motor speed to be close to the operating frequency of the exciting force; must be the largest range of motor excitation force in the synthesis of the selected; then according to the selection of working frequency and the maximum excitation force selection of vibration motor power.

2) the adjustment of excitation force

Vibration sieve productivity and the exciting force to increase exponentially, the exciting force caused by the rapid increase in productivity, and the plugging rate is increased with the increase of the excitation force decreased rapidly. Increase the excitation force makes the vibration intensity increases, the sieve face increasing material force, material move speed increases, the productivity, jam