vibration screen circular in kenya

vibrating screen types & working principle [how to choose] | m&c

vibrating screen types & working principle [how to choose] | m&c

According to different structure and use, vibrating screens usually be devided into many types by the vibrating screen manufacturers. Below wil introduce the top 10 vibrating screens, and how to choose the right vibratory screen?

linear vibrating screen is driven by double vibrating motors. When the two vibrating motors are rotating synchronously and reversely, the excitation force generated by the eccentric block offsets each other in the direction parallel to the axis of the motor, and overlaps into a resultant force in the direction perpendicular to the axis of the motor, so the motion track of the linear vibrating screen machine is a straight line.

Working Principle:The two motor axes of the linear vibrating screen have an angle of inclination in the vertical direction relative to the screen panel. Under the combined force of the exciting force and the self gravity of the material, the material is thrown on the screen surface to jump or move forward in a straight line. Through the multi-layer screen panels, a variety of specifications of materials are generated, and discharged from their respective outlets, so as to achieve screening and classification. linear vibrating screen is suitable for screening various dry powder or granular materials with particle size of 0.074-5mm, moisture content <7%, and no viscosity. The feed particle size is not more than 10 mm.

Circular vibrating screen is a new type of vibrating screen with multi-layer screen and high efficiency. According to the type of materials and the requirements of users, the high manganese steel woven screen, punched screen plate and rubber screen plate can be used. The circular vibrating screen is installed in the seat type. The adjustment of the screen surface angle can be realized by changing the position and height of the spring support.

Working Principle: The motion track of the screen box of the circular vibrating screen is circular. The circular vibrating screen uses the inertia exciter to produce vibration. The main shaft fixed on the screen box is driven by the motor to rotate at high speed, and the eccentric body installed on the main shaft rotates with it, generating centrifugal inertia force, so that the screen box that can freely vibrate will produce vibration similar to the circular track.

Circular vibrating screen is widely used in the materials classification of mining, building materials, transportation, energy, chemical industry and other industries because of its long flowing line and many screening specifications.

Elliptical vibrating screen is a vibrating screen with elliptical motion track (Elliptical Shale Shaker), which has the advantages of high efficiency, high screening accuracy and wide range of application. Compared with the ordinary sieve machine of the same specification, it has larger processing capacity and higher screening efficiency.

Triaxial elliptical vibrating screen is widely used for the screening operation of sand and stone materials in sand plant. It is the ideal screening equipment for all kinds of mines, quarries and mobile screening stations.

Working Principle: The power is transmitted from the motor to the main shaft of the exciter and the gear vibrator (speed ratio is 1) through the V-belt, so that the three shafts can rotate at the same speed and generate the exciting force. The exciter is connected with the high-strength bolts of the screen box, resulting in elliptical movement.

Materials on the screens do high-speed elliptical movement along with the screen machine, so as to achieve uickly separate, sift and move forward, and ultimately complete the classification of materials.

The working surface of the roller screen is composed of a series of rolling shafts that arranged horizontally, on which there are many screen plates. When working, the fine material passes through the gap between the roller or screen plate, large blocks of materials are driven by rollers, moving to the ends and discharging from the outlets. Roller screens are mostly used in the traditional coal industry.

Working Principle: For the rolling shafts are arranged according to different working angles, the speed of the material is faster when it runs in the position with higher working angle; the speed of the material is slower when it runs in the position with lower working angle.

When two kinds of materials running at different speeds converge at a certain position on the screen surface, they start to move axially, so that the materials are evenly distributed on the screen surface, and the screening efficiency is improved.

Rotary vibrating screen is mainly used for the classification of materials with high screening efficiency and fine screening accuracy. Fully closed structure, no flying powder, no leakage of liquid, no blocking of mesh, automatic discharge, no material storage in the machine, no dead angle of grid structure, increased screen area.

Any particle, powder and mucus can be screened within a certain range. Sieve to 500 mesh or 0.028mm, filter to 5 microns minimum. It can be used for classification, classification and filtration in food, chemical, metal, mining and other industries.

With the help of the heavy hammer installed at the upper and lower ends of the motor shaft, the rotary motion of the motor is transformed into a horizontal, vertical and inclined three-dimensional motion, which is then transmitted to the screen surface to make the material do an outward involute motion on the screen surface. Working Principle: After the rotary screen is started, the eccentric blocks of different phases at the upper and lower ends of the vibrating motor generate a composite inertia force, which forces the vibrating body of the rotary screen machine to rotate again and again, and the screen frame continuously moves to and fro under the action of the vibration force, and then drives the screen surface to vibrate periodically, so that the materials on the screen surface move in a positive and directional manner together with the screen box. Materials smaller than the screen meshes fall to the lower layer, and the materials larger than the screen meshes discharged from the discharge port.

High frequency vibrating screen is also called high frequency screen for short. High frequency vibrating screen (high frequency screen) is composed of exciter, pulp distributor, screen frame, supporting, suspension spring and screen, etc. High frequency vibrating screen is the most important screening machine in mineral processing industry, which is suitable for completely wet or dry raw materials.

Working Principle: Different from ordinary screening equipments, high frequency screen adopts high frequency, which destroys the tension on the pulp surface and makes the fine materials vibrate at high speed on the screen, accelerates the separation of useful minerals with large density (specific gravity), and increases the probability of contact between the materials with smaller than the separated particle size and the screen holes.

As a result, high frequency screen results in a better separation conditions, which makes the materials that smaller than the separation size (especially with larger specific gravity), and pulp pass through the screen holes together to complete the screening. High-frequency vibrating screen is usually operated at an inclined angle 0-25, up to 45, and the operating frequency range is 1500-7200r/m.

Grizzly screen has simple and solid structure, no power consumption, no moving parts, low equipment cost and convenient maintenance, but the productivity is low, the screening efficiency is not high, generally 50% 60%, and the mesh is easy to be blocked.

Working Principle: Generally, the grizzly screen is placed in an inclined position, and the materials are dumped at the high end. Under the action of its own weight, it slides down the screen surface, and the particles smaller than the gap or hole on the screen surface pass through the screen to achieve classification.

Banana screen is mainly suitable for the classification of large and medium-sized materials with high content of fine particles, and it can also be used for dehydration, demineralization and desliming.

Working Principle: During operation, the motor is connected with the vibration exciter through the V-belt or soft connection. The motor drives the eccentric shaft to rotate to generate centrifugal inertia force, which forces the screen box to vibrate. After the materials fall into the screen from the feeding inlet, they move forward rapidly under the action of the vibration force, loosely and pass through the screen.The thickness of the material layer of banana screen from the feeding inlet to the discharging outlet is constant. The ratio of the material quantity to the flow speed on the screen of each section is stable, the material layer is high and uniform. The screening efficiency of banana screen is higher, which is 1-2 times higher than that of other screening machines with the same effective area.

Heavy inclined screen can be applied to the treatment of debris from quarry, mine and building demolition, the treatment of topsoil, the recycling of construction materials, the screening of gravel, and the screening of gravel and aggregates.

Working Principle: The screen box shaft is driven by the motor installed on the auxiliary frame through three V-belts, the auxiliary frame is rigidly connected with the machine underframe, and the screen box spring is used to support the screen box.Inclined screen usually adopts 2-4-layer screen panels, and is fixed on the inclined frame at an angle between 15 and 30. The material can be screened into 3-5 grades at the same time.

Horizontal screen has the advantages of both inclined screen and linear vibrating screen. horizontal screen has the features of good screen permeability, large processing capacity and small installation height.

The installation angle of common vibrating screen is 15-30, while the installation of horizontal screen is parallel to the ground, or slightly inclined 0-5. Horizontal screen is an ideal equipment for all kinds of mines, quarries and mobile screening stations.

Working Principle: Horizontal screen is designed with oval stroke. The advantage of this design is that it can change the oval big diameter length and angle of throwing material stroke to meet the best needs of vibrating screen. The oval stroke is easy to adjust by center gear, counterweight wheel and motor speed.

Different types of vibrating screens can be used for the same material to get different screening effects. The reasonable selection of vibrating screen is an effective way to improve vibration efficiency and maximize economic benefits. Generally, you need to consider the following 5 tips:

When choosing vibratory screen, the material characteristics should be taken into account, including the content of material particles under the screen, the content of difficult screen particles, material moisture, the shape and specific gravity of the material, and the content of clay.

Tips: Heavy vibrating screen is used for materials above 200mm; circular vibrating screen is used for materials above 10mm; linear vibrating screen and high frequency vibrating screen are used for desliming, dewatering and grading.

When selecting the vibratory screen, the screen areas, layer numbers, shape, size and area ratio of the screen holes, as well as the motion mode, vibration frequency and amplitude of the vibrating screen should also be considered.

Tips: In order to keep the screens under good working conditions, the ratio of screen length to width should be in the range of 2-3; when there is much viscous mud and high moisture in the material, double deck screens should be avoided as far as possible.

Vibratory screens need to be selected according to different screening purposes. If it is necessary to pre screen materials, circular vibrating screens are generally used; for the classification and screening of crushed materials, large vibrating screens and probability screens are selected; for the deionization and dehydration of materials, linear vibrating screens are better; if it is necessary to desliminate and clean up materials, probability screens are used.

When selecting the shale shakers, it also needs to be considered according to the processing capacity of the production line, screening method, screening efficiency and the tilt angle of the shale shakers.

Professional vibrating screen manufacturers could provide competitive vibrating screen price, diversity customized vibrating screen models, timely after-sales service, spare parts and can continue to provide services for customers whole production circle.

5 vibrating screen common problems and how to solve? | m&c

5 vibrating screen common problems and how to solve? | m&c

There are many kinds of vibration screens, such as electromagnetic vibration screens, circular vibration screens, linear vibration screens, etc. The latter two belong to inertial vibration screens, which are commonly referred to as vibration screens. In daily production, vibration screen will encounter a variety of problems, such as poor screening quality, bearing overheating, abnormal sound, wrong technical indicators and so on.

Table of Contents 1. Poor screening quality1) Screen hole blockage2) serious wear of screen hole3) Non-uniform feeding of sieve4) too thick material on screen5) insufficient inclination of screen surface6) The motion direction of eccentric block is not in the same phase2. Bearing overheating1) too small radial clearance of bearing2) too tight top of bearing cover3) Bearing oil shortage or excessive, oil pollution or inconsistency3. Abnormal sound when the sieve is running1) Spring damage2) Bearing wear3) Bolt loosening of fixed bearings4) Untightened screen4. Technical indicators do not meet the requirements1) The sieve cannot start or its amplitude is too small.2) Insufficient rotational speed of sieve3) The Vibration Force of the Screen is Weak4) The amplitude of four points of the sieve is inconsistent5. Severe or damaged parts of sieve1) Pipe Beam Fracture2) Beam fracture3) Fracture of screen frame

There are many factors affecting the screening effect, including the nature of feeding, equipment factors, operation factors and so on. The reasons for poor screening quality include blocking of sieve hole, serious wear of sieve hole, uneven feeding of sieve, too thick material on sieve and insufficient inclination of sieve surface.

When the mud content and water content in the feed are high, the material will stick to the sieve hole and block the sieve hole. At this time, the sieve hole should be cleaned first, and then the spray amount and the inclination angle of the sieve surface should be adjusted appropriately.

When the screen is used for a long time, the wear of the screen hole will be serious and the screening effect will be seriously affected. At this time, the wear screen hole should be repaired. When the wear situation is very serious, the replacement of screen mesh should be considered.

When the feeding trough of the sieve is too narrow, the material can not be uniformly distributed along the whole sieve surface, which makes the sieve surface inefficient to use, and will affect the screening effect. At this time, the width of feeding trough should be adjusted to make the feeding of sieve uniform.

The excessive thickness of material on screen may be caused by the increase of feeding quantity, blocking of screen hole and small inclination angle of screen surface. At this time, it should be adjusted according to the specific situation.

For the circular vibrating screen, the most common reason for the poor screening effect is the inadequate inclination of the screen surface, so it is necessary to pad the back support. In practical application, the inclination angle of screen surface is more suitable when it is 20 degrees. The inclination angle of circular vibrating screen is generally 16-20 degrees. If the inclination angle is lower than 16 degrees, the phenomenon that the material on the screen is not moving smoothly or rolling upward will occur.

For linear vibrating screen and high frequency vibrating screen, the poor screening quality may be related to the movement direction of eccentric block, because two groups of eccentric blocks with the same mass need to rotate in self-synchronization and reverse direction to produce a single exciting force along the vibration direction at each instant, which has a fixed angle with the horizontal direction, so that the screen box can move in a reciprocating straight line. If not in the same phase, the direction of excitation force and direction of vibration will not overlap, and the effect of efficient screening will not be achieved.

Because the bearing on the vibrating screen bears a large load, a high frequency, and the load is always changing, the bearing must adopt a large clearance. If the bearing with ordinary clearance is used, the outer ring of the bearing must be grinded again to make it a large clearance.

There must be a clearance between the cover and the outer ring of the bearing to ensure the normal heat dissipation and certain axial movement of the bearing. The clearance can be adjusted by a gasket between the end cap and the bearing seat.

The technical indicators of the operation of the sieve include the rotational speed, vibration force, amplitude and frequency of the sieve, etc. Common fault types are: the screen can not start or the amplitude is too small, the speed is not enough, the vibration force is weak, the four-point amplitude is inconsistent, and so on.

When the vibration screen can not start or the amplitude is too small, the first consideration should be whether there is an electrical fault. Damage of motor and insufficient voltage can lead to faults. When there are no problems in the above aspects, we should start with the mechanical aspects. Whether the material on the screen surface is heavily accumulated or not, if so, it should be removed in time; whether the bolts on the coupling of the exciter fall off or not, whether the grease is caked; if so, the bolts should be tightened in time and the grease should be replaced.

Insufficient rotational speed may be the electrical reason. At this time, we should find out the reason and deal with it in time. It may also be that the transmission tape is too loose. At this time, we should tighten the transmission tape.

The inconsistency of four-point amplitude of sieve may be caused by the asynchronism of two exciters on the same axis or material segregation. At this time, adjustments should be made to make the two exciters work synchronously and eliminate material segregation in time.

(a) The thin wall of pipe girder may lead to fracture. At this time, the same type of thick wall pipe or the first type of pipe girder should be selected, but it should not be too large or too thick, because this will increase the vibration quality of the sieve and bring many problems;

B) There must be horizontal and vertical pressure strips at the joints of the sieve plates of dehydration and de-mediation screens. If there is no longitudinal pressure strip, water will leak from the gap between the sieve screens and wash down the pipe girders, which are easy to break at the scouring point.

D) If the fracture of the pipe beam is not serious, in order not to affect production, the pipe beam can be repaired to continue to use. When repairing, the weld should be along the longitudinal direction of the pipe beam, and no transverse weld must be allowed, otherwise the pipe beam is more likely to fracture from the transverse weld.

Cross beam fracture is mostly due to the long working time at critical frequency, a large number of high-strength bolts to tighten the side plate are relaxed, serious deformation of the spring makes a great difference between left and right, or it may be that the weight error of eccentric block is too large, causing structural damage and cross beam fracture. At this time, the damaged structural parts and beams should be replaced, bolts should be tightened, and the quality of eccentric blocks should be adjusted.

The sieve frame is liable to break because of tremor. The best way to solve this problem is to thicken the side plate or add additional plate to the local area of the side plate near the exciter to enhance the rigidity of the whole sieve frame.

Thanks for explaining that you should replace screen mesh if it has been used for a long time. This makes sense, because that way you can save money by getting more efficient results. Ill have to look for a wire mesh screen.

vibration frequency, screen inclination of the vibrating screen | lzzg

vibration frequency, screen inclination of the vibrating screen | lzzg

Vibration characteristics include vibration frequency, amplitude, vibration direction angle, and screen inclination. If these parameters are set incorrectly, it will affect the working efficiency of the vibrating screen. The correct way is: 1. Screen angle The angle between the screen surface and the horizontal plane is called the screen angle. The size of the dip is closely related to the throughput of the screening equipment and the screening efficiency. When the inclination angle is increased, the throwing strength of the material on the sieve will be increased, so that the forward movement speed of the material on the sieve surface is accelerated, so that the treatment amount of the vibrating screen is increased, but the residence time of the material on the sieve surface is shortened, and the opportunity for screening the sieve is reduced. , thereby reducing the screening efficiency. On the contrary, the throughput is reduced and the screening efficiency is improved. In order to control the screening efficiency of the vibrating screen to a relatively ideal range, the screen inclination angle of the circular vibrating screen is generally between 15-25, and the screen inclination angle of the linear vibrating screen is between 0 and 8. 2. The angle between the vibration direction angle vibration direction line and the upper screen surface is called the vibration direction angle. The larger the value of the vibration direction angle is, the shorter the distance moved by the material is, and the slower the movement speed of the material on the screen surface, the material can be fully sieved, thereby obtaining a larger screening efficiency. The smaller the value of the vibration direction angle is, the farther the material throws and advances each time. The faster the material passes through the screen surface, the higher the processing capacity, but the material cannot be fully sieved. Therefore, the vibration direction angle should be reasonably selected. For difficult-to-screen materials, the vibration direction angle should be taken as a large value. For easy-screen materials, the vibration direction angle should be small; in general, the vibration direction angle of the circular vibrating screen is 90. The vibrating direction angle of the linear vibrating screen ranges from 30 to 60, often 45. This value not only has good performance for various screening but also obtains the best moving speed and high productivity. circular vibrating screen 3. The amplitude A amplitude increases, the mesh plugging phenomenon will be greatly reduced, and it is also conducive to the stratification of materials. However, too large amplitude is also destructive to the device. The choice of amplitude is based on the particle size and nature of the material being screened. In general, the larger the vibrating screen size, the larger the amplitude selected. When the linear vibrating screen is used for classification, the amplitude is slightly larger; when used for dehydration and deliming, the amplitude should be smaller. When the particle size of the treated material is large, the amplitude should be correspondingly increased; when the particle size of the treated material is small, the amplitude should be smaller. Usually, the amplitude of the linear vibrating screen is A=3.5~6mm. 4. The increase of vibration frequency vibration frequency can increase the number of times the material beats on the screen surface, which increases the probability of material permeability. This is helpful for speeding up the material screening speed and improving the screening efficiency, but it is too high. Reduce the life of your equipment. For larger particle sizes, use larger amplitudes and lower frequencies; for finer particles, use smaller amplitudes and higher frequencies.

Vibration characteristics include vibration frequency, amplitude, vibration direction angle, and screen inclination. If these parameters are set incorrectly, it will affect the working efficiency of the vibrating screen. The correct way is:

1. Screen angle The angle between the screen surface and the horizontal plane is called the screen angle. The size of the dip is closely related to the throughput of the screening equipment and the screening efficiency. When the inclination angle is increased, the throwing strength of the material on the sieve will be increased, so that the forward movement speed of the material on the sieve surface is accelerated, so that the treatment amount of the vibrating screen is increased, but the residence time of the material on the sieve surface is shortened, and the opportunity for screening the sieve is reduced. , thereby reducing the screening efficiency. On the contrary, the throughput is reduced and the screening efficiency is improved. In order to control the screening efficiency of the vibrating screen to a relatively ideal range, the screen inclination angle of the circular vibrating screen is generally between 15-25, and the screen inclination angle of the linear vibrating screen is between 0 and 8.

2. The angle between the vibration direction angle vibration direction line and the upper screen surface is called the vibration direction angle. The larger the value of the vibration direction angle is, the shorter the distance moved by the material is, and the slower the movement speed of the material on the screen surface, the material can be fully sieved, thereby obtaining a larger screening efficiency. The smaller the value of the vibration direction angle is, the farther the material throws and advances each time. The faster the material passes through the screen surface, the higher the processing capacity, but the material cannot be fully sieved. Therefore, the vibration direction angle should be reasonably selected. For difficult-to-screen materials, the vibration direction angle should be taken as a large value. For easy-screen materials, the vibration direction angle should be small; in general, the vibration direction angle of the circular vibrating screen is 90. The vibrating direction angle of the linear vibrating screen ranges from 30 to 60, often 45. This value not only has good performance for various screening but also obtains the best moving speed and high productivity.

3. The amplitude A amplitude increases, the mesh plugging phenomenon will be greatly reduced, and it is also conducive to the stratification of materials. However, too large amplitude is also destructive to the device. The choice of amplitude is based on the particle size and nature of the material being screened. In general, the larger the vibrating screen size, the larger the amplitude selected. When the linear vibrating screen is used for classification, the amplitude is slightly larger; when used for dehydration and deliming, the amplitude should be smaller. When the particle size of the treated material is large, the amplitude should be correspondingly increased; when the particle size of the treated material is small, the amplitude should be smaller. Usually, the amplitude of the linear vibrating screen is A=3.5~6mm.

4. The increase of vibration frequency vibration frequency can increase the number of times the material beats on the screen surface, which increases the probability of material permeability. This is helpful for speeding up the material screening speed and improving the screening efficiency, but it is too high. Reduce the life of your equipment. For larger particle sizes, use larger amplitudes and lower frequencies; for finer particles, use smaller amplitudes and higher frequencies.

The excitation force, vibration frequency and screening effect of the dewatering screen are closely related. Too small excitation force will cause poor screening effect, and excessive excitation force may cause damage to the screen plate.How to adjust the vibrating screen. 1. Control of screening area The width of the screen surface is the main factor that determines the production rate

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