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Direct Discharge Vibrating Screen

What is Direct Discharge Vibrating Screen

 

Direct discharge vibrating screen uses a single horizontal vibration motor as the excitation source. The vibration motor is placed on one side of the body. After the material enters the equipment, the force of the vibration source makes an elliptical motion trajectory on the screen surface. At the same time as the rapid and reciprocating action of passing the mesh is completed, the vibration force can continuously peel, disperse and reorganize the material, so that the material can pass through the mesh quickly. If the material that cannot pass through the mesh is discharged from the discharge port on the screen according to the movement trajectory of the equipment, the screening operation process is completed. The Direct Discharge Vibrating Screen is mainly for the screening of flour powder materials, and the maximum mesh number of flour powder materials is 140 mesh, so the highest sieving mesh of the vertical sieve is 140 mesh; and the three-dimensional rotary vibrating screen is equipped with mesh cleaning device, so the material below 500 mesh can be screened at most.

 

Advantages of Direct Discharge Vibrating Screen

 

 

Large capacity
Direct discharge vibrating screen the feeding port and the discharging port are on the same center line to help reduce the screening time, the material stays in the screen machine for a short time, and the material is discharged quickly.

 

Used in series in the system
Direct discharge vibrating screen it can be used directly in the pipeline in series to remove foreign matter and impurities in the pipeline without manual operation and avoid secondary pollution of materials.

 

Clean operation
Direct discharge vibrating screen the airtightness is good, the powder does not fly, and it can be directly used in conjunction with the vacuum feeder to achieve negative pressure and dust-free operation.

 

Occupies little space
Direct discharge vibrating screen the motor is designed on the outside of the equipment to reduce the height of the equipment and make the space effective; the equipment is easy to operate, and the large obtuse angle is easy to clean.
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Our products have been exported to Russia, USA, France, Namibia, Saudi Arabia, Thailand, Uruguay, Singapore, Spanish, Germany, Cyprus,Botswana, Korea, Switzerland,Newzeland, Pakistan, Brazil, Malaysia, Spanish, Peru, Chile,Turkey, Portugal, etc.

Our produck

Our produck have Vibrating Screen, Screw Conveyor, Belt Conveyor, Vacuum Conveyor, Bag Dumping Station.

Quality Management

We are qualified with ISO quality management system and CE certificate, all the main components are fine manufactured in our own factory with strict inspection, and quality is always our priority.

 

 
Rotary Vibrating Screen VS Direct Discharge Vibrating Screen
 

 

Appearance

Rotary vibrating screen and self-discharge screen are very similar from the appearance, both are round sieve. But the motor of rotary vibrating screen is a vertical vibrating motor, the equipment can do 1-5 layers of 6 levels of screening, usually using three layers of screen mesh. Rotary vibration sieve screen can be as fine as 500 mesh, for the fine materials below 60 mesh screening effect is better than the straight row sieve.

Inline sieve adopts horizontal vibration motor, according to the demand can choose single side motor and double side motor. Inline sieve screen commonly used mesh 12 mesh, 20 mesh, 24 mesh, 30 mesh, 40 mesh, 60 mesh, usually using a single layer of screen mesh for material screening.

Structure

There are also some differences in the structural characteristics of rotary vibrating screens and inline screens. Rotary screens are usually arranged horizontally and consist of a screen box, a vibrator and a screen surface. The vibrator makes the screen box and screen surface vibrate by generating vibration force.

The inline screen is usually arranged vertically, and the screen surface consists of multi-layer screen panels, with different sizes of holes in each layer.

Working Principle

The working principle of rotary vibrating screen is to use vertical vibrating motor as the excitation source, driven by the motor material in the screen frame to do horizontal, vertical, inclined three-dimensional movement. The materials are separated by the elliptical movement trajectory produced by the vibrating screen machine. After the material is put into the feed port, it is vibrated by the vibration force, and makes linear vibration up and down along the elliptical trajectory. This vibration can make the materials spread, separate and dewater quickly on the screen surface. Rotary vibrating screen is suitable for fine particles and multi-classification screening work.

The working principle of Direct Discharge Vibrating Screen is to double vibration motor as the vibration source, driven by the motor material in the sieve frame to do elliptical movement, rapid and reciprocating to realize the material over the screen action. Through the material on the screen surface under the action of gravity from top to bottom of the linear movement, and screen surface to complete the screening process. After the material is evenly distributed in the upper feeding area, it gradually passes through the screen surface in a downward direction. In this process, the larger particles are blocked by the screen mesh above, while the smaller particles fall through the screen holes to the bottom. Therefore, inline screens are suitable for screening relatively large particles.

Application

Rotary vibration sieve can be particles, powder, slurry materials for effective screening work, can be 400 mesh powder materials, 500 mesh slurry materials for effective screening work. Mainly used in chemical industry, food, food, pharmaceuticals and other fine particles and difficult to screen materials screening.

Straight row sieve is mainly for a large number of particles, powder materials, coarse screening in addition to impurities. Straight row sieve mesh is larger, can make the material quickly through the screen, can screen 60 mesh powder materials, screening output is more than 4 times the rotary vibration sieve. Straight row screen is suitable for the front-end feeding system of the production line, mainly used for coal, ore, cement and other large particles and materials that are not easy to adhere to the screen.

Mesh Clearing Method

The rotary vibrating screen is equipped with a special bouncing ball clearing device, and the bouncing ball is placed in the lower part of the screen, which is carried by the ball carrier. During the screening process, the bouncing ball produces secondary vibration to clean up the mesh surface to avoid clogging.

Inline sieve general screening are particles, or coarse powder materials, not easy to block the mesh, so generally do not need special mesh clearing device.

 

How to Take Measures to Prevent Water into Direct Discharge Vibrating Sifter

 

The Direct Discharge Vibrating Sifter is a new and multifunctional screening machine, which can be installed one or two vibration motors according to customer’s specific situation.This type vibrating sifter is useful to remove foreign particles from desired material, removal of lumps from powder, separate different size of material, separation of oversize from screened material, especially for flour powder.
The Direct Discharge Vibrating Sifter is used in screening granules and powders, which is suitable for single-deck sieving and screening on raw materials of small production of fewer impurities, such as flour, starch, detergent, metal powder, additive, chemicals, non-mining industries etc.
Most kinds of vibrating and screening machines are not waterproof, if the water flow in machines or the whole machines are always wet, as a consequent the vibrating motor will break down, especially when we reuse the vibrating and screening machines after they several months shut down. So what measures should take to prevent water into Direct Discharge Vibrating Sifter? 

Circulating hot air drying:

We can use thermal insulation material(such as firebrick) to build a drying chamber,with an fresh air inlet in the top and air intakes in the side.The air inlet is connect with the heating room which is made of iron sheet,the ground of which is insulate electricity and heated by electric stove wires of 3KW/220V(it also can be heated in the other ways).Then dryer dry the vibrating motor winding by blowing the hot air(the temperature of air should be controlled for about 100℃) in the heating room to the drying chamber.

Chemical desiccant water absorption

Quick lime, which major element is calcium oxide,absorbs water by chemical reaction,which is irreversibility. Regardless of environment humidity,quick lime has the water absorb ability of more than 35% of it self weight. Quick lime is suited to preserve at low temperature and its price is low.

Dual Motor Direct Discharge Vibrating Screen

 

Application of Direct Discharge Vibrating Screen
 

Food industry
Vibrating screen can be used for processing starch powder, sugar powder, sale, rice flour, milk power, soybean mile, sauce, fruit juice, condiment, and so on.

 

Chemical industry
This vibrating sieve is widely used for handling resin powder, paint, industrial chemicals, detergent powder, cosmetic, Chinese medicine powder.

 

Metallurgy industry
In metal processing industry, this inline vibrating screen can sift aluminum powder, lead powder, copper powder, alloy metal powder, electrode powder, manganese dioxide powder, electrolytic copper powder, abrasive powder, High temperature resistant material, kaolin, limestone, dolomite, alumina, calcium carbonate, quartz sand and so on.

 

Pollution abatement
Our vibrating screen is also suitable for treating waste oil, sewage, accessory ingredient, activated carbon.

 

Dual Motor Direct Discharge Vibrating Screen

 

Features
  • Simple and compact structure , easy maintenance , Failure of small.
  • Fully enclosed structure , eliminate dust , noise , quiet and environmentally friendly.
  • The large flow spout at the bottom , to facilitate the installation of the pipeline operations.
  • Upper discharge port can be any adjustment within 360°for easy installation and use.
  • Processing capacity , high screening accuracy , and can effectively save energy , play a multiplier effect
  • The new network structure , network tension high , long service life , and customers can quickly replace the screen.
  • The energy consumption of our inline vibrating screen is small, while the noise could reach as low as 73-80 dB.
  • The protective grade of the motor comply with IP65, which means it is dustproof and waterproof. Besides, it is also heatproof and oil proof.
  • During the operation, if short circuit, phase loss or unstable voltage occurred, the motor will automatically cut off the power supply and stop working to make sure the motor will be not burnt out. Thus the electric element's damage can be reduced to an extremely low level.

 

How to Use Direct Discharge Vibrating Screen in the Flour Production Process

 

The processing precision of flour is mainly measured by the bran content of flour. The whiter the flour is, the less the bran content is, and the higher the precision of flour is.
The processing precision of flour is affected by many factors such as raw grain, processing technology and operation index.Therefore, higher requirements are put forward for wheat screening and flour particle size screening accuracy.
Direct discharge vibrating screen is used to select wheat after it has been ground. In order to improve the yield of powder, the endosperm must be scraped off as much as possible. Part of the aleurone layer will be scraped off and mixed into the flour.
In the process of scraping, there is also a small amount of wheat husk broken into fine powder, need to go through the sieve into the flour to improve the flour particle uniformity.In this production process, direct discharge vibrating screen is used to screen the flour to improve its fineness.In addition, wheat cleaning is the basic work of flour making, only the pure wheat sent to the flour making workshop processing, can produce high-precision flour.All kinds of impurities contained in wheat should be cleaned by sieving machine to reduce the impact of sundries on flour fineness.In order to reduce the black spots and improve the accuracy of the flour, it is necessary to improve the heterochromatic impurities.

 

Reasons and Solutions for Unsmooth Discharge of Direct Discharge Vibrating Screen
 

The reason why the direct discharge vibrating screen does not discharge

  • The screen box of the vibrating screen is not kept horizontal. If the screen box is not horizontal, the screen surface will be offset to a certain extent, and the material cannot flow in a straight line.
  • The rigidity of the support spring of the screen box causes the material to be subjected to excessive excitation force, resulting in violent vibration. If the support spring is damaged, it will also cause uneven force on the material and cause abnormal flow.
  • After the screen is damaged after using it for a long time, the material cannot flow normally on the screen surface.
  • The feeding of the vibrating screen is uneven, and the material cannot be subjected to uniform excitation force, so it will also lead to an abnormal flow of the material on the screen surface of the linear vibrating screen.
  • The loosening of the vibration source causes the inclination to change. Tighten and adjust in time.
  • The fastening bolts of the screen frame and screen plate are loose, causing resonance and causing the screen machine to work abnormally.
  • Screen box cracked.
  • The eccentric mass is displaced.

Solution

  • Adjust the horizontal level of the linear vibrating screen to keep the screen box level.
  • The support spring with certain toughness is used as the support of the linear vibrating screen. Replace damaged spring structures and broken screens.
  • Keep feeding evenly and continuously. Feeding should not be too much or too little to cause an unbalanced load on the screen box.
  • Tighten loose screws and bolts. Repair welding and reinforcement at the fracture, and lubricate the vibration source in time.
  • Adjust the eccentric block to ensure that the front-end amplitude and vibration frequency are consistent. The back-end amplitude and vibration frequency are consistent, which can solve the problem of deviation.
  • Do the daily maintenance of the equipment. Find problems and solve them in time, reduce the failure rate and improve the efficiency of equipment use.

 

 
FAQ
 
 

Q: What is the purpose of a vibrating screen?

A: The vibrating screen is suitable for the screening of various solid materials, such as powder, granular and liquid materials. It has the characteristics of high screening efficiency, high screening precision, stable and reliable operation, easy operation and maintenance, etc.

Q: What are vibrating screens in mineral processing?

A: Rock vibrating screens, also known as rock sieves or rock shakers, are mechanical screening machines designed to separate rocks and other granular materials based on size. These screens utilize vibration and specialized screen surfaces to efficiently classify and separate rock particles into different size fractions.

Q: What is the mechanism of vibrating screen?

A: The vibrating screen consists of a screen body, a vibrator mechanism, a drive assembly and spring suspension units mounted on a frame or support structure. The screen body is supported by coil springs on which the body can bounce freely. The vibrating motion thus is given by counterweights built on the shaft.

Q: What is the direction of the vibrating screen motor?

A: The direction perpendicular to the axis of the vibrating motor overlaps as a resultant force, so the running trajectory of the vibrating screen machine is a straight line, and the two motor shafts have an inclination angle relative to the screen surface.

Q: How effective is a vibrating screen?

A: Vibrating screens offer unmatched screening performance with benefits like: High screening efficiency even for small and fine materials. Large screening capacity from compact equipment. Low operating costs with little energy consumption.

Q: What is the efficiency of a vibrating screen?

A: The usual target is a efficiency of 95%. An efficiency of 99% will equate to a significant loss of capacity. Efficiency is the ratio of undersize material in the feed that actually passes from the media to the undersize material that should pass from the media.

Q: What are the factors affecting the vibrating screen?

A: The working efficiency of vibrating screen is related with various factors, which includes the raw material properties, structural parameters of screen deck, motion parameters of vibrating screen etc. Raw material properties are the important factor affects the working efficiency of vibrating screen.

Q: Why is it necessary to screen material in mineral processing?

A: Screening media is crucial in mineral processing as it helps separate the desired mineral particles from the unwanted ones. This process ensures that only the valuable minerals are further processed, which increases efficiency and reduces cost.

Q: How long is the stroke of a vibrating screen?

A: The general working stroke of an inclined screen is between 8 and 12 mm, and design of inclined screens permits changes to this stroke through the addition or removal of additional eccentric masses on the exciter.

Q: How does shape of particles affect screening efficiency?

A: Spherical particles pass with equal probability in any orientation, while elongated, flat and irregularly shaped particles pass with less probability in some orientations. In addition, they may hinder other particles from passing and reduce screening efficiency even further.

Q: How do I increase the amplitude of my vibrating screen?

A: This can be achieved by adding more weight to the screen or by using a heavier material for the screen itself. Adjust the screen tension: Tightening the screen tension can also increase the amplitude of the vibration.

Q: What is amplitude in vibrating screen?

A: The amplitude of vibration does not depend on the rotation of the vibrating mechanisms. Amplitude combined with rotation imparts a certain amount of acceleration to the equipment and that acceleration is responsible for the conveyance of the material.

Q: What are the factors affecting the vibrating screen?

A: The working efficiency of vibrating screen is related with various factors, which includes the raw material properties, structural parameters of screen deck, motion parameters of vibrating screen etc. Raw material properties are the important factor affects the working efficiency of vibrating screen.

Q: Why are vibrating screens important?

A: The vibrating screen is suitable for the screening of various solid materials, such as powder, granular and liquid materials. It has the characteristics of high screening efficiency, high screening precision, stable and reliable operation, easy operation and maintenance, etc.

Q: Which is most efficient screening equipment?

A: Because these decks are flat, they are more efficient at separating materials that are of similar size to the screening mesh. Horizontal screens are ideal for use: When portable screening or mobile screening is required. When sorting sticky materials which may blind the openings.

Q: What is the principle of vibratory screen separator?

A: The working principle of the rotary vibrating screen: the vertical vibrating motor is used as the excitation source, and the upper and lower ends of the motor are equipped with eccentric weights, which convert the rotational motion of the motor into a three-dimensional motion of horizontal, vertical, and inclined.

Q: What are the applications of vibrating screens?

A: Recycling industry– They use these screens to separate metals, plastics, paper, and glass. Food and Pharmaceutical industry– These two processors use vibrating screens for grading and sifting powders, grains, and other ingredients.

Q: What is the operation of vibrating screen?

A: The operation of a vibratory screener begins with vibrations that move the mass of materials on a horizontal, vertical, or circular plane that causes the material to move across a sieve or screen mesh.

Q: Are vibrating screens effective?

A: According to the determined ranges,efficiency should be in the range of 90%-95% with respect to the above formula. Feed rate is the main parameter dictating efficiency. If the flow rate is below the capacity of the media, the runs idle so no s carried out.

Q: How do you maintain a vibrating screen?

A: Regularly check and tighten any loose components to maintain structural integrity and prevent excessive vibrations. Pay attention to the screen panels, clamping systems, and motor mounts, and ensure they are securely fastened.

We're well-known as one of the leading direct discharge vibrating screen manufacturers and suppliers in China. If you're going to wholesale direct discharge vibrating screen made in China, welcome to get quotation from our factory. Also, customized service is available.

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