Production description
Vibrating screen is a kind of screening equipment that can be classified, dehydrated, de-slimed, de-intermediate and sorted. The vibration of the screen body is used to loosen, stratify and penetrate the material to achieve the purpose of material separation. The screening effect of the vibrating screen not only has a great impact on the value of the product, but also has a direct impact on the efficiency of the next step.
Electric motor
The motor is driven by the V-belt to make the eccentric block of the exciter rotate at a high speed, which generates a large centrifugal inertia force, and stimulates the screen box to produce a circular motion with a certain amplitude.
Sieve surface
The material on the screen is subjected to the impulse imparted by the screen box on the inclined screen surface to produce a continuous throwing motion. During the process of meeting the material and the screen surface, the particles smaller than the screen hole can pass through the screen to achieve classification.
Shaking
For the circular vibrating screen, since the exciter is arranged above the center of gravity of the screen box, the long axis of the ellipse at both ends of the screen box forms a figure-eight shape, and the upper end of the long axis of the ellipse at the feeding end faces the discharge direction, which is conducive to the rapidity of the material. Spread out, and the upper end of the elliptical long axis of the discharge end is opposite to the discharge direction, which reduces the moving speed of the material, which is conducive to the screening of difficult-to-screen materials, and the arc-shaped screen surface increases the effective area of the screen machine, thereby improving its efficiency. processing power.
Spindle
In addition, for difficult-to-screen materials, the circular vibrating screen can make the main shaft turn over, so that the vibration direction is opposite to the moving direction of the material, and the moving speed of the material along the screen surface is reduced (in the case that the inclination angle of the screen surface is the same as the rotation speed of the main shaft), so as to improve the screening. effectiveness.
Performance characteristics
1. The circular vibrating screen adopts a cylindrical eccentric shaft exciter and an eccentric block to adjust the amplitude, which is easy to use and maintain.
2. The circular vibrating screen adopts spring steel woven screen or punching screen, which has a long service life and is not easy to block holes.
3. The circular vibrating screen adopts rubber vibration isolation spring, which has long service life, low noise and stable over-resonance area.
Linear vibrating screen
The vibration of the vibration motor is used as the vibration source, so that the material is thrown up on the screen, and at the same time moves forward in a straight line. The upper and lower sieves are discharged from their respective outlets.
Structure and characteristics of linear vibrating screen
Sieve surface
Due to the small inclination angle of the screen surface, the height of the screen is reduced, which is convenient for process layout.
Screen box
The screen box of the linear vibrating screen adopts a fully enclosed structure, and there is no dust spillage, which is more conducive to protecting the environment.
Vibration motor
The speed of the vibration motor is close to the working frequency; the maximum excitation force is within the range of the selected motor synthetic excitation force.
Multiple feed
The use of multi-channel feeding is equivalent to increasing the width of the screen surface and reducing the thickness of the material layer supplied to the screen surface, which is beneficial for the fine-grained materials to quickly contact the screen surface and pass through the screen holes. Reduce unnecessary transportation distance of coarse particles, thereby improving the efficiency of screening work.
The advantages of linear vibrating screen
1. Continuous production, single-layer or multi-layer does not require manual grading and screening;
2. Fully enclosed structure, no dust overflow.
3. Adopt vibration motor to save energy and low noise;
4. The starting speed is fast, and the linear vibrating screen stops running smoothly.
5. Simple installation, convenient operation and maintenance;
6. The screen borrowing rate is high, the unit area is large, it is not easy to see, and it is volatile;
7. The accuracy of screening and classification is over 96%, and the disposal volume is large.
Unique design of circular vibrating screen
Cylindrical Roller Bearings
The bearing has both the large bearing capacity of the double row spherical roller bearing and the advantages of the high limit speed of the cylindrical roller bearing.
Features:
①The carrying capacity of dynamic and static loads is 21% higher than that of ordinary bearings, and the service life is increased by 90%;
②The limit speed is 88% higher than that of ordinary bearings;
③ The friction torque in the whole speed range is very small, which is 25% smaller than that of ordinary bearings;
④ Low operating noise, because the statics of the rolling elements are optimized;
⑤Using the overall cage, high reliability;
⑥The allowable axial load carrying capacity is high;
⑦Good thermal stability, because the heat dissipation is optimized. (within 800 degrees)
Multi-layer screen design
The multi-layer screen can be designed such that the upper layer is a fine mesh screen, the middle layer is a coarse mesh screen, and the bottom layer is a coarse mesh screen. After these screens are stacked together, gluing and welding are used in the horizontal and vertical directions to bond the screens together and form a plurality of small multi-layer screens, each of which becomes a small vibrating screen. The strength of the screen is increased, the service life can be extended, the cost can be reduced, and materials of different sizes can be screened at the same time.
Feeding funnel structure modification
Add a baffle in the hopper of the feed conveyor belt of the vibrating screen to make the material turn to fall in front of the screen, so as to prevent the material from directly scouring the screen and causing partial damage to the screen.
Install rubber wear plates
In order to improve the service life of the lining plate and facilitate installation and disassembly, a rubber wear-resistant lining plate is installed at the tail of the vibrating screen with a total thickness of 35mm. The bottom layer is a steel plate with a thickness of 5mm. 30mm, the rubber is vulcanized to the steel plate. The rubber wear-resistant lining plate is installed in two pieces at the blanking point at the tail of the vibrating screen. The lining plate can be replaced when there is a problem, which not only improves the maintenance efficiency but also reduces the cost.
Mounting the Box Shaker
By adopting the resin sand casting molding process, the precision casting box body that meets the requirements can be produced, and the processing volume of the castings is significantly reduced, and the appearance quality is significantly improved.
The box body is integrated with a horizontal boring-milling machining center, which can realize all machining and forming at one time, and can ensure the machining accuracy.
Another non-metallic material screen
Improve screening efficiency. It can improve the screening efficiency of metal screen by about 20%.
Good wear resistance and long service life. Its average lifespan is more than 25 times that of metal mesh.
Reduce installation time and improve equipment operation rate.
The replacement times of the screen surface are reduced, and the operation rate of the equipment is generally 15% higher than that of the metal screen.
Reduce noise and improve working environment.
The whole sieve plate of the non-metallic screen mesh is a whole, which has a certain buffering effect and can reduce the noise by about 20dB(A).
Frequently Asked Questions
What should I do if the bearing of the vibrating screen is heated and damaged? (Cause and Solution)
Unreasonable bearing selection: Use special bearings. Commonly used vibrating screen bearings generally include cylindrical roller bearings and spherical roller bearings.
The design of lubricating and sealing structure is unreasonable: use thin oil lubrication, improve the lubrication channel, and improve the sealing structure
Improper selection of bearing and bearing housing hole fit: select a reasonable fit tolerance. The inner ring of the bearing and the shaft are fitted with a loose transition fit or clearance fit tolerance, and the outer ring and the bearing seat hole are fitted with a tight transition or a slightly smaller interference fit tolerance.
What is the difference between circular vibrating screen and linear vibrating screen?
The motor of the circular vibrating screen is driven by the V-belt to make the eccentric block of the exciter rotate at a high speed, which generates a large centrifugal inertial force and excites the screen box to produce a circular motion with a certain amplitude.
The linear vibrating screen uses vibration motor excitation as the vibration source, so that the material is thrown up on the screen and moves forward in a straight line at the same time.
What should I do if the screen frame is broken?
Screen frame breakage is generally caused by the shaking of the vibrating screen frame.
Solution: Thicken the side plate, or locally thicken the side plate near the exciter (or add additional plates) to enhance the rigidity of the entire screen frame.
How to deal with sieve blockage?
In general, the blockage of the screen holes of the vibrating screen is mostly due to the high mud content and water content in the feed, which makes the material stick to the screen holes and block the screen holes.
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