The Application of Vibrating Screen in Food Industry

Vibrating screen is a highly efficient screening machinery used in food industry. It’s mainly used for high precision fine powder and other materials with its advantage of easy operation and fully enclosed structure.

It is also suitable for granular, powder, mucus and other materials screening and filtering classification，Such as powdered sugar, starch, salt, rice flour, milk powder, milk, egg, soy sauce, vinegar, fruit juice, papaya powder, green tea powder, kudzu powder, and potato processing production. Materials mentioned above are used frequently in daily life, vibrating screen will be our best assistant.

Take Starch or rice powder for example, In the first step, we usually remove the impurity of raw materials followed by screening and weighing; The next step includes soaking, coarse grinding, germ separation, fine grinding, screening of starch, protein separation, centrifugal dewatering and thermostatic drying, The last step includes weighing and product packing.

During these steps, we will have great difficulty in processing the food without the screening of vibrating screen. Vibrating screen has the superiority in easily screening fine material, and therefore bring us the food diversification and help to develop the entire food industry rapidly.

Strict Inspection—Provide Perfect Equipment for Cients（Ⅱ）

3.Thickness test of paint coating.
Adhere the coating thickness meter probe to the equipment surface,then the data is the coating thickness of this point.Since the equipment surface area is large,it should be tested with many areas, it also requires multiple measurements to take average.
4.Amplitude test of equipment
After equipment runs normally,adhere the amplitude measuring scale to the side wall of screen box.There are many different circles with different diameter,and the movement locus will become to ellipse due to vibration,however, circles’ movement locus is still a circle,it shows that this circle’s diameter is very approached to the equipment amplitude,therefore,the circle diameter is vibrating amplitude.
All tests above have their own standard data,when the testing data has big difference with standard data,we will debug repeatedly to ensure equipment with a optimum working condition.

Reasons lead to circular vibrating screen mesh plug

When circular vibrating screen works, the material properties are very different, as well as its shape. Due to different shape of material ,it can produce a various forms of mesh plug.After the analysis of PK machinery engineers, the cause of mesh plug mainly shown as follows:
1.Contains a lot of close to the separation point particles
2. The material moisture content is higher
3. The spherical particles or material has multi-contact points property to mesh 
4. Static electricity occurs
5. Material is a fibrous material
6. Flake shape material proportion is more
7. Woven mesh wire diameter is too thick
8.Thick Sieve mesh, unreasonable hole shape design, which will lead particles get stuck.

How many types of vibration screen sieve mesh do you know?

Vibration screen sieve mesh is one of the main components of vibrating screen. If the sievemesh can not be chosen correctly, it will even affect the screening efficiency, when screening material is unqualified ( mesh is over sized), materials will accumulatedon the sieve badly (mesh is too small, material will accumulate on the sieve and lead to screen mesh damages). Here we’d like to introduce the different types of sieve meshed as below:
Woven mesh: material commonly used forscreening equipment with smallmaterial density and capacity. The construction materials are stainless steel sieve mesh, low carbon wire mesh, galvanized wire mesh. According to the material particle size, density, volume, material characteristics ,please choose sieve mesh with different construction material, aperture, wire diameter.

Punched sieve mesh: the span life of punched mesh is related to the mesh thickness, different mesh sieve size should use different thickness. The advantage of punched mesh is that it can be fixed according to the material shape.

Welding sieve plate: mainly used for ore sieving, coal sieving, it is welded by steel plates.

How to select the gyratory vibrating screen

Gyratory vibrating screen is generally used for granule, powder etc fine screening, such as urea, silicon carbide, activated carbon, silica sand, salt, sugar, plastics etc industries. 
Features of gyratory screen:
1. It can be customized to be 1~3 lyers, and the sieve mesh size can be indicated;
2. Generally,Screen mesh material is stainless steel, it also can be selected according to the customer’s requirements;
3. There are self-cleaning device (bouncing ball) under the screen mesh, to avoid blocking during running;
4. The gyratory screen box can be open-type, also can be enclosed model, sealing and dustproof;
5. The main screen body generally is hanging installed, it also can be designed to be seated type accordingly;
6. The screen mesh width can be selected from 1200~2000mm, screen mesh length can selected from 3000~4000mm. Special design also can be achieved.
In order to give you a better project solution, please kindly supply the following technical requirements: 
1. Do you have any installation space limit?___
2. How to feed material into the gyratory screen:___?
3. The required capacity ____t/h
4. Separated material name _____
5. Material density ____ t/m3;
6. Material particle size distribution percentage___%
7. Material temperature ____℃;
8. How many layers do you need ? or how many kinds range particle size material will you want to separate out?
9. If need to match the feeding device or discharging belt conveyor, please kindly send us the production line layout sketch, we will help you design the details accordingly.

What is the required data for tripper conveyor model selection?

Tripper conveyor can be designed to achieve discharging bulk material along the belt conveyor. It is applied to large area store material in warehouse etc. very well.The tripper conveyor is a kind discharge device, which can achieve multiple point discharging along the belt conveyor system, also can achieve both side discharging or single side discharging.

The rail for tripper conveyor is welded on the top of the conveyor intermediate frame, the rail length is designed according to the customer’s required discharging length.

In order to send you a better project solution, please supply the following technical requirements: 
1. The required discharge length for tripper conveyor ____m;
2. Do you have any installation space limit;
3. The required capacity ____t/h;
4. The length for belt conveyor system ____m;
5. Transported material name _____;
6. Material particle size distribution_____mm;
7. Material temperature ____℃;
8. Material density ____ t/m3;
9. If you have the required belt width, please kindly list ____mm. Or we will help you design it according the the above information.

New dust removal method for vibrating screen

Most of the Dust removal method of supported type vibrating screen in our country is cloth bag dust removing technology, which includes cover dust catcher, pipelines, cloth bag dust collector, induced draft fan and chimney, etc. The advantage is high dust removal efficiency. However,the disadvantage is large investment, low dust collecting rate, easy blockage of horizontal pipeline, large pumping air volume, high operating cost, big occupied area of dust catcher,induced draft fan and chimney, besides, it needs to set up full-time operation& maintenance personneland the dust transport equipment.
In order to solve the above problem, we have researched a new resolution with high rate of dust removal system, low processing cost, long service life, less investment, small area coverage and short construction period.
The new dust removal method offers secondary dust removal for supported type vibrating screen.Primary dust removal equipment will fixed above the vibrating screen,collected dust will enter into vibrating screen; Secondary dust removal equipment will be placed near vibrating screen and remove dust by itself.

Primary dust removal: seal the supported type vibrating sieve surface and set a dust filter above it,set up an efficient filter bag to filter the air, clean air will be discharged through 3.0 kW fan, thus dust will enter into the vibrating screen through the bottom of the filter. Vibrating screen drives sieve surface vibration,while the dust filter is fixed, so one moveswhile the other one not, both connected by the pipe, the joint connection adopts rubber to reduce the vibration.
Secondary dust removal: Seal the supporting type vibrating screen and dust removal joint, leave a open mouth to connect the pipe for conveying the escaped dust into the secondary dust filter,set a high efficient dust filter bag to filter the dust, and then the clean air will be discharged through 3.0 kW fan, then the dust is discharged from the filter at the bottom of the tube and the valve.

What is the selection notice of rotary vibrating screen?

1.Size of working area: rotary vibrating screen is circular, sieve surface area will effect of screening yield, so screening efficiency and yield can be improved by increasing the screening area. So the size of the field is one of the keys to the vibration screening.
2.Material characteristics: material properties,flowability and size.
3.Construction material : because of the different sieving materials, the construction material is also different, for example: food, salt, sugar and other related food industries, the whole machine material is SUS304. One reason is that hardness,thickness and wear resistance of 304 material are better, besides, polished stainless steel is bright like a mirror, the surface is clean and health, maintenance is very convenient which do not affect the material quality after screening. If the material is chemical, metallurgical and other raw materials, you can choose Q235 material, which not only save cost but also not affect the use.
4.Screen mesh can be divided into two kinds: stainless steel and carbon steel.
The shape and size of rotary vibrating screen are different generally based on the actual application and the on-site condition, and can be designed according to the requirements of clients to meet special circumstances. Common types of rotary vibrating screen: XZS-800mm, XZS-1000mm, XZS-1200mm, XZS-1500mm, XZS-1800mm, etc. 

What is the Helpful installation tips of vibrating feeders?

Vibrating feeder is generally used for evenly, regularly feeding, distributing bulk material in different production lines to guarantee the steady connecting between the upper and bottom equipment. When feeder model is small with little capacity, the drive device can be 2 sets vibrating moor; while the feeder model is large with heavy capacity, the driven device can be 2 sets motor and vibrating exciter. It will be selected according to the actual technical requirements. 
In addition, vibrating feeder can be designed to be seated type or hanging type according to the on-site working condition and installation space. 
When vibrating feeder is installed under the hopper or silo outlet, and there is no enough or suitable installation foundation for vibrating feeder, it can be hanged with hanging devices to save the installation space,which makes the equipment connecting more easier. 
If the customers require seated type,vibrating feeder should be installed on embedded foundation.
If the material size is very small,similar like powder, dust etc. The vibrating feeder can be enclosed with dust hole and connect the dust collector in system to protect the environment. 
If any special requirements, vibrating feeder can be customized to meet the special technical requirements. 

Vibrating sieve surface material buildup reasons

In our company, there will be individual customers often call me to ask some information today explained one: Vibrating screens will appear in the course of the screen surface has a material accumulation phenomenon. So what is causing this phenomenon is the reason? Pingyuan mining mechanical engineer for detailed analysis of the phenomenon based on years of experience, can be attributed to four reasons:
1, the screen and the discharge port are in the same height? Under normal circumstances should be level or higher than about 6mm, depending on the material discharge port design are not the same height.
2, mesh shaker screen of choice if there are problems? Mesh mesh screen is too small will cause the material through network rate.
3, shaker vibration motor angle adjusting Is there a problem? Improper adjustment of the angle of the vibration motor can also cause material accumulation phenomenon, the smaller the angle on the screen surface material spread outward run faster, whereas angular displacement of the General Assembly to make the material spread out slow. If you are under strict requirements for screening accuracy, the motor angle should not be too small, so as not to affect the accuracy of screening, in general, the factory motor shaker angle of 45 °, the user can also special screening process based on its material Requirements will adjust the vibration motor angle to 100 °, the mesh material is centralized.
4. Check if the shaker is placed on the ground level, high spout will affect the operation of track material, causing the material to one side.

Difference between ultrasonic vibration sieve and ordinary rotary vibrating screen

Compared with rotary vibrating screen, ultrasonic vibration sieve is equipped with a ultrasonic generator, with self-cleaning function ,the mesh is not easy to block, it is no need to add bouncing balls and other anti blockage device. Ultrasonic vibrating screen is particularly suitable for screening fine powder and light weight material with mesh size larger than 300 mesh.

 

Ultrasonic screening system is composed of ultrasonic resonant power supply, oscillator and resonance ring. The ultrasonic resonant powder supply will generate longitudinal oscillating wave which will transmit to the resonance ring to produce a resonance, and then the vibration will be transmitted to the screen mesh evenly through the resonance ring. While material on the screen mesh does three dimensional vibration movement in the low-frequency, it will overlap the ultrasonic vibration which can prevent the mesh plug and improve the screening yield and screening quality.
The performance characteristics of ultrasonic vibrating screen: it can sieve the heavy, light, ultra-fine, strong adsorption powder (almost all of the powder is effective) that ordinary rotary vibrating screen can’t sieve. Compared with ordinary rotary vibrating screen, the material passing rate of ultrasonic vibrating screen will be increased by 50%-400%, the performance is as follows:
(1). Reduce screen mesh cleaning time;
(2). No pollution of powder that generated by bouncing ball and other auxiliary materials;
(3). Keep the screen mesh size, stable precision screening;
(4). Reduce the material stuck on screen mesh size;
(5). Reduce screening frequency.