Vibrating Screen Installation and Operation

A vibrating screen is a sort of filtering mechanical separation equipment which is most typically used in the strong mud treatment of the mining industry.

The vibrating screen is commonly used in mining, building materials, transport, power, chemical, etc. It is used for material classifying, washing, dewatering, and screening. In this article, you will certainly discover the installation and also debugging (test run) of the vibrating screen and also the operation skills to improve the screening efficiency, which will help you to be a specialist in the location of the vibrating screen.

Installation of Vibrating Screen

( 1) Install Supports or Hangers

The installation of each part will be accomplished in sequence in strict conformity with the illustrations of support or lifting, and also the actual strength noted on the completion face shall be matched before the installation of spring parts. The base of the shaker has to be flat and steady.

( 2) Installation of Screen Box

Link the screen box to the sustaining or hanging device, as well as change it according to the defined Inclination after installation. For hanging screens, the inclination angle of the screen box, as well as the degree of the primary shaft of the screen box, shall be readjusted at the same time.

( 3) Install Motor and also V-Belt

Throughout the installation, the base of the electric Motor will be leveled; the motor level shall be remedied, the centerline of the matching groove of both belt wheels shall be overlapped, as well as the tension of the triangular belt will be appropriate.

( 4) Install as well as Secure Screen Panel

( 5) Inspection After Installation

Inspect whether the feed chute, discharge chute as well as receptacle under the screen clash during operation.

Trial Run of Vibrating Screen

Test running time of the vibrating screen is greater than 8 hrs. Observe whether the vibrating screen begins smoothly as well as rapidly, whether the vibration and operation are stable, no special sound, as well as whether its amplitude fulfills the requirements.

When the vibrating screen is running, the vibration of the screen box must not create a horizontal pendulum. If the horizontal pendulum happens, the factor might be that the height difference between the springs on both sides is too large, the stress of the hanging cord rope is unequal, the rotation axis is not horizontal, or the triangular belt is as well tight.

Within 4 hrs of running, the bearing temperature increases slowly and then remains stable. The highest possible temperature does not exceed 75 ℃.

If there is abnormal noise or a sharp increase in bearing temperature after startup, quit right away, examine whether the shaft revolves flexibly and also whether the lubrication is good, and so on, as well as start once again after fixing.

After competing for 2 hrs, quit examining whether the connecting parts are loose or otherwise. If there is any loosening, wait on securing and afterward start.

If there is no fault after 8 hours of operation of the vibrating screen, the installation job can be checked and also approved.

Operation of Vibrating Screen

( 1) Operator shall read the obligation document and also execute the general examination of the equipment prior to working. Check the tension of the triangular belt, the oil degree in the vibrator, the stress of the screen surface, the attachment of the bolts as well as the damages of the screen surface area.

( 2) Start-up of the vibrating screen ought to comply with the process series.

( 3) When the vibrating screen is running, it is essential to examine the functioning problem of the vibration exciter as well as the screen box. The temperature rise of the bearing ought to be inspected after the vibrating screen is quit.

( 4) The shutdown of the vibrating screen should be in conformity with the process sequence. With the exception of special requirements, it is purely forbidden to continue feeding to the screen after stopping.

( 5) During the handover, the evaluation ought to be done well, as well as the problems should be recorded in time.

( 6) In order to stop crashes, assessors ought to maintain their distance.

Exactly How To Improve Screening Efficiency

The screening efficiency straight influences the vibrating screen manufacturing effectiveness, as well as the screening performance, can usually be enhanced by the following means:

• Boost opening up price of screen plate

• Readjust the feeding setting

• Self-cleaning screen plate

• Readjust vibrating screen inclination angle

• Try wet screening

• Adjust the weight

• Control feeding wetness content

• Added taken care of screen

Furthermore, affordable and also scientific installation, debugging as well as operation of the vibrating screen can properly boost the classification performance, lengthen vibrating screen service life and also lower the labor intensity of the operator.

9 differences between linear shakers and circular shakers

 Screening separates materials with different residential properties, a crucial part of the aggregate assembly line. Screening machines are classified into different types according to their framework and motion qualities, among which circular vibrating screens and linear vibrating screens are the most commonly used mining equipment. FengWang, as one of the leading Chinese linear vibrating screen manufacturers, will present the top 9 differences tips between linear and circular vibrating screens through this article.

1. Different Movement Trajectories

A circular vibrating screen takes advantage of centrifugal force produced by the rotation of the eccentric block in the vibrator to make the screen box, vibrator, and other components make a forced constant circular or approximate circular movement. The materials on circular vibrating screens move with screen boxes in a round movement trajector.

The linear vibrating screen uses the vibration force of the vibrating electric motor to make the material vomit on the screen and progress in a straight line.

2. Different Exciters

The linear vibrating screen exciter is composed of 2 shafts. It services the principle of vibrating electric motor, so it is additionally called a double shaft vibrating screen.

The circular vibrating screen is likewise called a solitary shaft vibrating screen because the exciter is one shaft and works with an inertia motor.

3. Different for Plugging

The material on the linear vibrating screen actions smoothly on the screen panels. If the material is fed erratically or the moisture thickness of the material is large, it is easy to block.

The material of the circular vibrating screen relocates parabola shape on the screen panels, which makes the material disperse as much as feasible. The material embedded in the screen opening can likewise jump out, and the plugging is much less.

4. Different Installation Inclination

In the manufacturing of linear vibrating screens, the inclination angle of screen surface area is slight, and the screen's height is decreased, which is convenient for the screening plant format.

A circular vibrating screen typically has a 15-20 ° installation angle to alter the movement speed of materials and the screen panels and enhance the screening effectiveness.

5. Different Materials

The linear vibrating screen is generally made from light or stainless steel plate.

The material of the circular vibrating screen is thick, as well as package body is made of manganese steel, which can resist the impact of the material in the screening process.

6. Different Shape & Structure

The linear vibrating screen can embrace an entirely shut framework without dust overflow, which is more for environmental protection.

While the exciter of the circular vibrating screen is arranged over the facility of screen box gravity, which is conducive to the quick spread of materials, the therapy capacity is higher than that of the linear vibrating screen.

7. Different Applications

The linear screen is mainly used to screen significant fragments, materials with light specific gravity, and low solidity, primarily including dry powder, fine particles, or micro powder, which are usually used in food, chemical, building materials, and pharmaceuticals industries.

A circular vibrating screen is generally used for screening materials with a large ratio, large fragment size, and high hardness, which is widely used in mines, coal preparation plants, quarries, etc. On top of that, circular vibrating screens can also be used for materials that are hard to screen.

8. Processing Capacity

A circular vibrating screen can transform the spindle so that the vibration instructions are opposite the material movement instructions. Also, the material movement rate along the screen surface area is decreased. Therefore the screening effectiveness is boosted.

9. Environmental Protection

The linear vibrating screen can adopt a fully closed structure without any dirt overflow, which is more conducive to the defense of the setting.

Circular Vibrating Screen VS Linear Vibrating Screen
Type	Circular Vibrating Screen	Linear Vibrating Screen
Feed Size	≤ 400mm	≤ 300mm
Panel Angle	20°	15°
Exciting Vibration	Single Shaft	Double Shaft
Movement Trajectory	Circular	Linear
Application	Mine, Coal , Quarry	Food, Chemicals, Buildings, Pharmacy

Linear motion vibrating screens are usually used in our coal washing plants. In actual manufacturing, the selection of circular vibrating or linear vibrating screens primarily relies on the kinds of materials and application fields that users handle. The screening function is different, the selection of equipment is also different.

Vibrating Screen Efficiency Calculations and Improvement

 

Vibrating Screen Efficiency Calculations

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For the efficient use of Vibrating Screens, several conditions need to be met, starting from selecting a suitable screen. Many factors related to the screened material, such as type, humidity, and size distribution, should be considered in selecting the right screen. Choosing the correct screen type and the right dimension requires expertise. FengWang's expert engineers will boost your profitability by choosing the right screen for you.

Another critical factor affecting screening efficiency is the choice of the screen baffle, which can be made of materials such as wire and polyurethane. The screen baffle should be resistant to vibration, have sufficient open space, and be resistant to wear. 

The efficient operation is related closely to how the screen is fed. The belt that feeds the screen should provide feeding in parallel with the flow direction of the material and in a manner that brings the materials to the center of the loading vessel. 

Another critical factor in efficient screening is the layer height (or bed). The layer height refers to the height formed by the layer on the wire surface at the point where the material is loaded. The ideal height is four times the screen aperture.

The capacity and efficiency of Vibrating Screens are usually inversely proportional. The usual target is a screening efficiency of 95%. An efficiency of 99% will equate to a significant loss of capacity.

Screening efficiency is the ratio of undersize material in the feed that passes from the screening media to the undersize material that should pass from the screening media. This ratio is desired to be 100%. However, this is not possible due to the factors affecting the screening process.

However, Vibrating Screens producers and quarry managers have determined acceptable efficiency ranges to ensure an optimum screening process. Screen efficiency should be 90%-95% concerning the above formula according to the determined ranges.

Feed rate is the main parameter dictating efficiency.

If the flow rate is below the screening capacity of the media, the screen runs idle, so no screening is carried out. On the other hand, if the flow rate is above the screening capacity of the media, the screen runs under the overflow rate, and in this case, no screening is made due to the high material depth on the media. Accordingly, screen selection must be made with due attention paid to the flow rate to obtain maximum screening efficiency.

Screening efficiency is affected by the factors listed below:

• Wear, abrasion, and tearing in the screen baffle.

• Feeding too much or too little material onto the screen.

• Large grade changes.

• A humidity level of the screened material.

• The efficiency of the machine used before the screening.

  
  

How to Improve Vibrating Screen Efficiency?

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Screening of Vibrating Screens is the crucial link of mines, chemical plants, and cement plants. Screening performance refers to the high-quality ratio of the authentic screening product to the material included in the feed that is less than the sieve opening. Screening performance directly influences production effectiveness.

The aspects that affect the screening performance of vibrating Screens as well as the approaches to enhance the screening performance are as below:

1. Properties of materials

(1) The even more easy-to-screen fragments are included, the less complicated the material is to screen, as well as vice versa, the more difficult the material is to screen.

Particles with bit size d= 1-1.5 an (a is the size of the screen mesh) are easily embedded in the screen hole of the vibrating Screens, which is called obstacle fragments, affecting the material to travel through the screen hole. As a result, the more complex and obstructive particles the material has, the reduced screening performance.

(2) Particles with round form are easy to go through square and circular holes of vibrating Screens. At the same time, strip, sheet, and polygonal materials are challenging to pass through the square and circular hole shaker Vibrating Screens but very easy to go through rectangle-shaped hole shaker Vibrating Screens.

(3) Water content. In dry screening, materials with high wetness content and far better wettability and bond are more accessible to agglomerate as well as block the screen holes and greatly minimize the screening efficiency.

(4) Bulk thickness. When the bulk thickness of materials is large, the screening performance of the vibrating screen is symmetrical to the bulk thickness.

2. Residence of Screen Plates

(1) Opening rate. The ratio of the screen opening location to the screen panel area is called the opening price. High opening prices produce high screening efficiency and production capacity; however, they cause short life of screen panels.

(2) Screen hole shape. The screen opening shape differs, and the material's passing capacity varies considerably. When picking the hole sort of the vibrating screen, it ought to be appropriate for the bit shape o

f the material.

(3) Size of screen plates. The proportion of size to the screen plates needs to be within a suitable array, typically 2.5-3.

(4) Screen inclination. Reduced inclination angle, reduced manufacturing capacity; also large inclination angle, reduced screening efficiency. The inclination angle of the shaker screen is generally 0 ° -25 °, which of a fixed shaker screen is 40 ° -45 °.

10 Methods to Improve Screening Efficiency

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1. Attire Feeding

Constant and consistent feeding to ensure that the material is uniformly distributed on the screen to guarantee a greater production capacity and screening performance.

2. Feeding Volume

It should be effectively and reasonably fed to stay clear of too much or inadequate.

3. Boosting Opening Rate

Boosting the opening price of the vibrating screen plate and the high opening rate is helpful to improve the screening result. Typically, the opening price of a stainless-steel screen plate is higher.

4. Change Feeding Mode

In some cases, the feed of the vibrating screen is not fed along with the full-screen size, leading to insufficient utilization of the screen plate.

5. Reduce Plugging Rate

The self-cleaning screen plate can be selected to reduce the blocking price of the vibrating screen plates.

6. Adjusting Inclination

Modification of the inclination angle of the vibrating screen machine can be thought about. An appropriate inclination angle is conducive to decreasing the material density.

7. Wet Screening

Wet screening can be used to boost the screening result.

8. Adjusting Balance Weight

For a circular vibrating screen, readjusting the weight can be considered to improve the screening performance.

9. Regulating Feed Moisture

For dry screening, feed moisture needs to be strictly managed.

10. Including Fixed Screen

If the authorization, the fixed screen is included in the feeding end of the vibrating screen.

Here we end our sharing for today. If you need to replace or buy a new Straight Linear Motion Vibrating Screen, please contact us now!

What are the Sieve Techniques of Linear Vibrating Screen?

 

 

The linear vibrating screen utilizes a vibrating motor as the resource of vibration, to ensure that the material is thrown up on the screen while moving forward in a straight line. The material gets in the inlet of the screening machine evenly from the feeder, as well as creates data via the multi-layer screen. The oversieve as well as undersieve of various specs are released from their particular electrical outlets. It has low power consumption, high outcome, simple structure, simple maintenance, completely confined framework, no dust spillage, automated discharge, and is better for production line procedures. So do you know what are the sieving approaches of the linear vibrating screen? Let me describe it to you next. In the sieving process of materials, the powder example is gone through a series of standard filters with different filter holes, separated into several fragment grades, and also evaluated individually. The bit size distribution expressed as a mass percentage is called the screen analysis technique That is, screen analysis, the objective of which is to determine the particle size structure of the material. There are three common screening approaches; these three screening approaches can approximately meet the screening needs of users for different materials. The linear vibrating sieve analysis approach can be split into several kinds, such as dry sieving, wet sieving, hand sieving, dry and also wet mixing, mechanical sieving, air jet sieving, acoustic sieving, panning sieving and self-organizing sieving. And so forth, the outcomes of screen analysis commonly use frequency distribution as well as collective circulation to share the bit size distribution. There are numerous techniques pointed out above, it depends on which material the customer screens, so as to pick the suitable screening method, but the more generally used are the initial three, let's take a look together next.

 

1. Dry sieving technique

The so-called dry sieving approach, as the name indicates, is to determine the difference between the amount of the sieving balance and also the bottom stock of each sieving meter as well as the complete dry mass m0 of the example prior to sieving, as the loss during sieving, as well as determine the loss price. A particular weight of powder sample in the filter is used to make the fine powder pass through the filter with the help of mechanical vibration or hands-on tapping till the sieving is finished. The filter residue of the powder sample is determined according to the weight of the residue on the screen and also the weight of the sample. When establishing the particle size circulation, dry sieving is generally used.

 

2. Wet screen technique

Place a particular weight of powder sample in the sieve and clean it for a specific time period with a suitable diffusion water stream (with a specific water pressure), and afterwards the sieving is complete. According to the weight of the sieve deposit as well as the weight of the sample, the wet filter method is used to obtain the filter deposit of the powder example. If the sample consists of a lot more water and the particles have solid cohesiveness, wet sieving must be used (the accuracy is more than that of dry sieving), especially for materials with finer particles. If it is enabled to blend with water, it is best to make use of wet sieving. Due to the fact that the wet approach can protect against really great bits from sticking to the sieve holes as well as obstructing the sieve openings. In addition, the wet approach is not affected by the material temperature and atmospheric humidity, and also the wet technique can also improve the operating problems. Therefore, the wet approach and the thousand approach have been provided as the nationwide standard approach for the resolution of the fineness of concrete and also resources.

 

3. Integrated screen evaluation of wet and also dry

Integrated dry-wet filter evaluation is to integrate the two methods and also select the best. When the material has a lot more water as well as mud, and also the materials are adhered to each other, the combined dry-wet filter evaluation method ought to be used, and the outcomes acquired by the sieve evaluation are a lot more accurate. The specific method is to pour the example right into a fine-hole sieve and screen it in a basin having water. Modification the water in the basin every 1 to 2 minutes till the water in the basin is no longer turbid. The material on the screen is dried out and also evaluated, as well as the top quality of the washed penalty mud is determined based on the difference between the evaluated mass and also the mass of the initial sample.

 

The three screening techniques pointed out above usage basic equipment and also very easy operation, yet the screening results are easily affected by the shape of the particles. The size of the particle size circulation is fairly rugged. When the lower limit of the examination exceeds a specific value, the screening time will certainly be decreased. Expanding, it is simple to block the screen. For that reason, when screening, the bit size of the material need to be changed as much as feasible to stay clear of the material from blocking the screen.

Fengwang for All Your Needs

Whether you choose linear or circular movement while selecting a vibrating screen, we've got you covered with high quality products at Fengwang. Our products have been relied on as well as re-ordered by leading firms around the globe over and over again. Discover why-- request a free quote now. If you have inquiries regarding how the vibratory screener or sieve process works with our equipment, submit our speak with an experienced form and a rep will aid you.