The vibrating screen works by using the reciprocating rotary vibration generated by the vibrator excitation. The upper rotating weight of the vibrator causes the screen surface to produce plane rotary vibration, while the lower rotating weight causes the screen surface to produce conical rotary vibration, and its combined effect causes the screen surface to produce compound rotary vibration. Its vibration trajectory is a complex spatial curve. The curve is projected as a circle in the horizontal plane and an ellipse in the vertical plane. The amplitude can be changed by adjusting the exciting force of the upper and lower rotating weights. By adjusting the spatial phase angle of the upper and lower weights, the curve shape of the motion track of the screen surface and the motion track of the material on the screen surface can be changed.
It is a filterable mechanical separation equipment for mud solid phase treatment, which is composed of screen and vibrator. The thickness of the screen is expressed in mesh. Generally, the screen with less than 50 mesh is coarse screen, and the screen with more than 80 mesh is fine screen. The vibrator is an eccentric wheel, which rotates driven by the motor to vibrate the screen frame. Due to the vibration of the screen frame, when the mud flows to the screen surface, the coarser solid particles stay on the screen surface and are discharged from one end along the inclined plane. The finer solid particles and mud liquid flow to the mud pit through the screen hole.
Main types of vibrating screen: product advantages and disadvantages: high efficiency, light weight, complete and diverse series,
YK circular vibrating screen
YK circular vibrating screen
Multi level, dry material screening can meet the demand. For materials with high moisture and adhesion, this model is not suitable. During operation, vibration makes the materials more tightly adhere to the screen surface, resulting in material congestion or forced shutdown. Due to the limitation of working principle, the energy consumption of this model is relatively high, especially under the condition of high output. In addition, the working noise and dust are heavy.
Vibrating screening equipment can be divided into mining vibrating screen, light fine vibrating screen and experimental vibrating screen according to weight and purpose
Mining vibrating screen can be divided into: heavy screen, self-determined intermediate vibrating screen, elliptical vibrating screen, dehydration screen, circular vibrating screen, banana screen, linear vibrating screen, etc
Light fine vibrating screen can be divided into: rotary vibrating screen, linear screen, straight row screen, ultrasonic vibrating screen, filter screen, etc. refer to vibrating screen series
Experimental vibrating screen: clapping screen, top impact vibrating screen machine, standard inspection screen, electric vibrating screen machine, etc. Please refer to the experimental equipment
According to the material running track of the vibrating screen, it can be divided into:
According to the linear motion track: linear vibrating screen (materials move forward in a straight line on the screen surface)
According to the circular motion track, it is divided into: the structure and advantages of circular vibrating screen (materials move circularly on the screen surface)
Classification according to reciprocating motion track: fine screening machine (materials move forward in reciprocating motion on the screen surface)
Vibrating screen is mainly divided into linear vibrating screen, circular vibrating screen and high-frequency vibrating screen. Vibrating screen can be divided into single shaft vibrating screen and double shaft vibrating screen according to the type of vibrator. The single shaft vibrating screen uses a single unbalanced weight to excite the screen box to vibrate, the screen surface is inclined, and the motion track of the screen box is generally circular or elliptical. The double shaft vibrating screen is excited by double unbalanced weights rotating synchronously in different directions. The screen surface is horizontal or gently inclined, and the motion track of the screen box is a straight line. Vibrating screens include inertial vibrating screen, eccentric vibrating screen, self-determined intermediate vibrating screen and electromagnetic vibrating screen.
Linear vibrating screen
Vibrating screen is a screening machine widely used in coal and other industries for material classification, washing, dehydration and demineralization. Among them, linear vibrating screen has been widely used because of its high production efficiency, good classification effect and convenient maintenance. In the working process, the dynamic performance of vibrating screen directly affects the screening efficiency and service life. The vibrating screen uses the excitation of the vibrating motor as the vibration source to make the materials be thrown up on the screen and move forward in a straight line at the same time. The materials evenly enter the feed inlet of the screening machine from the feeder, and several specifications of above and below the screen are generated through the multi-layer screen and discharged from their respective outlets. Linear vibrating screen (linear screen) has the advantages of stability and reliability, low consumption, low noise, long service life, stable vibration mode and high screening efficiency. It is a fast and efficient new screening equipment, which is widely used in mining, coal, smelting, building materials, refractory, light industry, chemical industry and other industries.
The process of dividing the broken materials with different particle sizes into several different levels through the single-layer or multi-layer screen surface with uniform holes for many times is called screening. The particles larger than the sieve opening are left on the sieve surface, which is called the above sieve on the sieve surface, and the particles smaller than the sieve opening pass through the sieve hole, which is called the below sieve on the sieve surface. The actual screening process is: after a large number of broken materials with different particle sizes and mixed thickness enter the screen surface, only a part of the particles contact the screen surface. Due to the vibration of the screen box, the material layer on the screen is loose, which further expands the existing gap of large particles, and small particles take the opportunity to pass through the gap and transfer to the lower layer or conveyor. Because the gap between small particles is small and large particles cannot pass through, the originally disorderly arranged particle groups are separated, that is, they are stratified according to the particle size, forming the arrangement rule of small particles in the bottom and coarse particles in the top. The fine particles that reach the screen surface and are smaller than the screen hole are sieved through. Finally, the coarse and fine particles are separated to complete the screening process. However, there is no sufficient separation. Generally, a part of the lower sieve remains in the upper sieve during screening. During fine-grained screening, although the particles are smaller than the screen hole, their screening difficulty is different. For particles with similar material and screen hole size, it is more difficult to pass through the screen, and it is more difficult to pass through the particle gap at the lower layer of the screen surface.
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