How do Vibrating Screens work?
Dec. 15, 2021
Vibrating screens have been widely used in mining, metallurgy, coal, water conservancy, transport, and chemical industries to complete numerous processes, such as screening, grading, washing, de-intermediation, and also dehydration of materials. As an intermediate web link between mining as well as smelting, mineral processing effectiveness not just directly impacts mineral processing productivity yet additionally has an extensive effect on the logical use of national sources.
The vibrating screen works by utilizing the double-rotation vibration created by the vibrator. The upper turning weight of the vibrator makes the screen surface shake in an airplane, while the reduced turning weight makes the screen surface shake the cone surface. Its combined impact The impact is that the screen surface produces double-rotating vibration. Its vibration trajectory is a complicated spatial contour. The curve is predicted as a circle on the horizontal plane and forecasted as an ellipse on the vertical plane. The amplitude can be changed by readjusting the excitation pressure of the top as well as reducing rotating weights. Changing the spatial phase angle of the upper and also reduced weights can change the contour form of the screen surface movement trajectory and change the movement trajectory of the material on the screen surface.
Types of Vibrating Screens
Vibrating screen equipment can be split right into vibrating mining screen, light, great vibrating screen, as well as experimental vibrating screen according to its weight.
Mine vibrating screens can be split into durable screens, self-centering vibrating screens, elliptical exerciser vibrating screens, dewatering screens, circular vibrating screens, banana screens, linear vibrating screens, etc.
Light, great vibrating screen can be divided into rotating vibrating screen, linear screen, straight row screen, ultrasonic vibrating screen, filter screen, and so on
Experimental vibrating screen: waving screen, top-strike vibrating screen, standard examination screen, electric vibrating screen, etc.
According to the material running track of the vibrating screen, it can be separated right into
According to the linear motion trajectory: linear vibrating screen (the material moves on the screen surface in a straight line);
According to the circular motion trajectory: circular vibrating screen (materials move circularly on the screen surface);
According to the reciprocating motion trajectory: great screening machine (materials reciprocate onward on the drying surface).
The specific workflow of vibrating screen
Recently, although vibrating screening machinery has actually achieved extraordinary development, the theoretical framework of vibrating screens has been secure and becoming mature. Numerous sorts of vibrating screens have actually been presented one after one more. However, vibrating screens with high screening efficiency and also big outcome have actually constantly been vibrating—the new instructions of filter r & d.
The coal or ore extracted in the mining field, or the smashed material, before the material is used or better refined, it requires to be divided right into several grades of similar bit size or be dried out, de-intermediated, de-slimed, and also often a combination of a number of items. Yes. When doing the above work, there is always the trouble of grading materials via the holes of the screen surface, and the grading of materials with the holes of the screen surface is called sieving. With the research study on the screening process of materials, it is discovered that the screening of materials can be divided into two phases.
1. Fine-grained materials smaller than the mesh size get to the screen surface with the material layer made up of grainy materials.
2. The great bit material passes through the sieve holes on the sieve surface to complete the sieve.
When the vibrating screen is functioning, both motors synchronously and reversely revolve to make the exciter produce a reverse excitation pressure, requiring the screen body to drive the screen to relocate longitudinally to make sure that the material is on it is periodically thrown onward for a range because of the excitation pressure. So regarding finishing the material screening operation. It is appropriate for screening sand as well as gravel materials in quarries and can likewise be used for product classification in coal preparation, mineral processing, developing materials, electrical power as well as chemical industries.
The functioning part of the vibrating screen is dealt with, and also the material is evaluated by sliding along the working surface. Repaired grid filter is among the most extensively used in concentrators, generally used for pre-screening before rugged squashing or medium squashing. It has a basic structure as well as is convenient to make. It does not take in power and also can directly dump the ore onto the screen surface. The primary drawbacks are low performance as well as low screening efficiency, usually just 50-60%. The working surface of the vibrating screen is composed of flat prepared rolling shafts. There are plates on the shafts, and fine-grained materials pass through the spaces between the rollers or plates.
In order to smoothly complete the screening process of the material, the problem of relative movement between the material and the screen surface needs to be pleased. For that reason, the screen box of the vibrating screen must have suitable movement characteristics. On the one hand, it can make the material on the screen surface become loose.
On the other hand, it can make the crude particles obstructed on the sieve holes leave and also maintain the fine-grained materials efficiently with the filter. In the real manufacturing process, the actual screening process is: "After a lot of busted materials with different fragment sizes and mixed crude as well as fine bits get in the screen surface, only a part of the material calls the screen surface. In this part of the material getting in touch with the screen surfa., It is not entirely a great particle material smaller sized than the mesh size,.
The majority of the continuing to be great bits smaller sized than the mesh size are distributed throughout the entire material layer.
Via the movement of the screen box, the material layer on the screen surface is loosened, to ensure that the void that exists between the huge particles is further expanded, and the small particles seize the day to go through the gap and also transfer to the reduced layer; at the same time, because of the little particles between the materials The void is small, as well as large bits can not travel through. Therefore, the position of huge particles enhances constantly thro that the movement. Because of this, the initial untidy material bit team separates, that is, it is split according to the fragment size, forming an arrangement rule with little bits under and coarse fragments on the top.
The fine bit material that gets to the screen surface, because its size is smaller sized than the screen opening size, can efficiently pass through the screen, and lastly recognize the separation of coarse and also great particle materials as well as finish the screening process." Nonetheless, sufficient separation is impossible. In time-sharing, there is typically a part of the great bits continuing to be in the crude fragments on the filter and also can not permeate the sieve. Research shows that although the size of the fine fragments is smaller than the sieve hole, the problem of their infiltration is not the exact same. Compared to screen holes, the smaller sized the particle size, the less complicated it is to penetrate the sieve, and the other way around, the more difficult it is.