Vibrating screen is used to correspond to the classification of materials, debris removal, screening, filtration work, and is widely used in chemical, food, pharmaceutical, metal metallurgy and other industries. Because of the wide range of industries, so the screening materials are also different, but the vibrating screen working principle is basically the same.
The working principle of vibrating screen is to use the high-frequency vibration of the screen body to screen and classify the materials. But its trajectory is more diversified, although many types of vibrating screen equipment, but are the use of vibration motor as a power source, and the vibration motor in the body of the different installation combination form, it produces a different trajectory.
Multi-deck linear vibrating screen
Multi-deck linear vibrating screen is mainly a seat-mounted multi-deck vibrating screen machine, according to the requirements of the number of mesh of the materials screened by different products to match the corresponding screen plate, it can achieve one-time simultaneous screening and filtration of a variety of different specifications of the materials, and it is simple to replace the screen mesh process, easy to operate the equipment, and it is widely used. Mainly used in chemical industry, papermaking, metallurgy, building materials, grain, abrasives, fertilizer and other industries on the screening of granular, powdery materials, classification and filtration and dehydration.
Multi-deck linear vibrating screen mainly consists of: screen box, screen plate, vibration motor and support device:
Box: can be made of stainless steel plate welding according to the application requirements.
Screen surface: the screen surface has stainless steel slit screen plate and wire woven mesh two structural forms, respectively, vertical compression and longitudinal tension way fixed, screen surface replacement is convenient and quick, long service life.
Vibrating motor: 2 horizontal vibrating motors are used to generate vibration source, and the eccentric blocks at both ends of the motor can be adjusted to meet the requirements of different excitation force.
Supporting device: the supporting frame and supporting spring welded by channel steel form the supporting device, and the inclination angle of the screen surface can be changed by changing the height of the front and rear supporting legs.
Multi-deck linear vibrating screen working principle:
There are two vibration motors installed in the lower part of the sieve machine, which do synchronous and anti-phase rotation when working. The eccentric block produces rated excitation force when rotating, and under its action, the box supported on four damping springs produces reciprocating linear vibration. When the vertical component of vibration acceleration N is greater than gravity and gravitational acceleration g, the material in the slot is thrown up, and according to the parabolic trajectory forward for the jumping movement, every time the slot body vibration, the material is thrown up once, in the process of meeting with the screen surface, so that less than the screen seam of the material through the screen surface, so as to achieve the purpose of grading.
Circular vibrating screen
Circular vibrating screen has a circular trajectory and makes circular movement, which is a kind of multi-layer number and new type vibrating screen. It is mainly applied to coal dressing, mineral processing, building materials, electric power and chemical industry.
Advantages of circular vibrating screen
Circular vibrating screen is to use the motor through the triangle belt to drive the exciter, so that the sieve machine along the direction of the excitation force to do the cycle back and forth movement, the material in the sun surface to do the circular movement, so as to achieve the purpose of screening.
1.The material has a long sieving line and many sieving specifications.
2.Simple structure, reliable operation, low noise, low power consumption.
3.High screening efficiency, large handling capacity, no material rushing phenomenon.
4.Closed structure body can be used to prevent dust pollution.
How it works:
The screen machine is driven by a triangle belt to drive the exciter, so that the screen machine along the direction of the excitation force to do the cycle of round-trip movement, the material in the sun surface to do the circular movement, so as to achieve the purpose of screening.
Large stones are evenly sent into the jaw crusher for crushing by the vibrating feeder through the silo The coarse crushed stones are sent to the impact crusher for further crushing by the belt conveyor, and the finely crushed stones are sent to the exciter screen by the belt conveyor for screening, and several different specifications of stones are screened, and the stones which satisfy the requirements of granularity are sent to the finished stockpile by the finished product belt conveyor, and those which do not satisfy the requirements of granularity are sent to the impact crusher for re-screening by the belt Stones that do not meet the granularity requirements are sent to the impact crusher by the belt conveyor to be crushed again, forming a closed-circuit cycle. The granularity of finished products can be combined and divided according to the user’s needs J. To protect the environment, auxiliary dust removal equipment can be configured.
Linear Vibrating Screen Working Principle
1、Vibrating force generated by the vibrating motor
Linear vibrating screen is usually equipped with one or more vibration motors, and these vibration motors make the rotor rotate at high speed through the eccentric device inside the rotor. Because the rotor’s center of rotation and the center of gravity do not coincide, so an eccentric force is generated, and this eccentric force is the vibration force generated by the vibration motor.
2、Vibrating force is transmitted to the screen surface
The vibration force generated by the vibration motor is transmitted to the screen box through the vibration spring on the vibration motor base or the vibrating screen frame. As the main part of the whole screening system, the screen box is equipped with screen mesh. When the vibration force is transmitted to the screen box, the screen box and screen mesh will also produce corresponding vibration.
3、the movement of materials on the screen surface
When the vibration force is transmitted to the screen box and screen, the screen box and screen will produce linear vibration. After the material is put on the screen surface, it produces jumping movement with the vibration of the screen surface, thus realizing the purpose of screening. Larger particles gradually move downwards in the direction of vibration and pass through the screen mesh, while finer particles are separated through the pores of the screen mesh.
Application areas of linear vibrating screen
1、Mining industry
In the mining industry, linear vibrating screen is widely used for screening and grading minerals such as ore, coal, limestone and so on. It can separate the raw materials according to the particle size, extract the ore particles that meet the requirements, and at the same time remove the impurities and fines to ensure the production process. The application of linear vibrating screen in the field of mining not only improves the utilization rate of ore, but also improves the production efficiency and product quality.
2、Building materials industry
In the building materials industry, linear vibrating screen is mainly used for screening and grading of sand, stone, cement, concrete and other raw materials. Through vibration screening, granular raw materials can be classified according to different particle sizes to ensure the molding quality and performance of the product. The application of linear vibrating screen in the production of building materials provides an important technical guarantee for the production enterprises and promotes the development of building materials industry.
3、Chemical industry
In the chemical industry, linear vibrating screen is mainly used for screening and grading of chemical raw materials, powder materials, granular materials and so on. The particle size of chemical raw materials has an important impact on product quality and production process, so it needs to be controlled by screening equipment. Linear vibrating screen has the characteristics of high screening precision, large output, easy maintenance, etc., which is widely used in the production process of chemical industry.
4、Food industry
In the food industry, linear vibrating screen is mainly used for screening and filtration of raw materials such as food, food additives, spices and so on. Food safety and hygiene is an important concern in the food production process, linear vibrating screen can effectively remove impurities and foreign matter to ensure the quality and safety of food. At the same time, it can also classify raw materials according to particle size to meet the needs of different food processing techniques.
5、Pharmaceutical industry
In the pharmaceutical industry, linear vibrating screen is mainly used for screening and filtration of pharmaceutical raw materials such as herbs, powder, tablets and so on. The quality and purity of drugs have a direct impact on the efficacy and therapeutic effect, so the raw materials need to be strictly screened and graded. Linear vibrating screen can effectively remove impurities and foreign matter, ensure the purity and safety of drugs, and provide important technical support for pharmaceutical production.
Difference between circular vibrating screen and linear screen
1、Difference in screening principle
Circular vibrating screen
The screening movement of circular vibrating screen is a circular or ring-shaped oscillating movement, which separates the materials in layers on the screen through centrifugal force. This kind of movement is suitable for screening materials with large and uniform particles, and the circular vibrating screen is especially excellent in primary screening.
Linear screen
The screening movement of linear vibrating screen is the linear movement of materials on the screen, and the materials are separated in layers through vibration. Because the screening movement of linear screen is more simple, it is suitable for the field with high requirements for screening accuracy, and can realize fine grading and dewatering.
2、The difference in the scope of application
Circular vibrating screen
Because the circular vibrating screen is suitable for primary screening of large particles, the circular vibrating screen is widely used in mining, metallurgy and other industries. It can effectively stratify the original materials and provide more uniform materials for the subsequent production process.
Linear screen
Due to its high screening accuracy, linear screen is often used in the fields of chemical industry, food, medicine, etc. It is especially suitable for the situation that requires detailed grading. It can classify the material according to the particle size to meet the requirements of different product specifications.
3、Comparison of performance characteristics
Circular vibrating screen usually has a relatively simple structure and is easy to maintain. However, due to the limitation of its movement mode, it may be relatively weak in screening efficiency and the ability to adapt to different materials.
Linear Screen
Linear vibrating screen has advantages in screening efficiency and adaptability. Its linear motion can better adapt to different types of materials, with higher screening efficiency and wider applicability.
4、Differences in equipment structure
Circular vibrating screen
Circular vibrating screen is usually composed of screen box, screen mesh, vibration motor and other basic components. Its structure is relatively simple, the bottom of the screen box with a vibration motor, through the vibration of the motor, so that the materials in the screen box for circular or circular swing screening.
Linear screen
The structure of linear vibrating screen is also basically similar, including screen box, screen, vibration motor and so on. The materials in the screen box are screened in the linear direction through the vibration of the vibrating motor. Different from circular vibrating screen, the screening motion of linear screen is linear.
The difference between vibrating screen and linear screen has obvious differences in screening principle, application scope and performance characteristics. When choosing suitable screening equipment, it is necessary to comprehensively consider the nature of the material, screening requirements and the actual situation of the production scene. Only according to the specific needs, a reasonable choice of circular vibrating screen or linear screen can better meet the screening needs of industrial production, improve production efficiency and optimize the production process.
