Why Circular Vibrating Screen can not Start up and Amplitude is Small

Why Circular Vibrating Screen can not Start up and Amplitude is Small

Days ago,my Russian friend asked me why circular vibrating screen could not start up,however,the amplitude was quite small even if it start up,and the screening efficiency is quite bad,here I summarize the reasons as follows:

1.The circular vibrating screen motor breaks down,please replace the motor;

2.The electrical equipment control circuit fails,please maintain and replace the electrical equipment;

3.The voltage is low,you can alter the power supply;

4.There are many accumulation materials on the surface,please clean up the material;

5.The screen itself has fault,please check and maintain the vibrating screen;

6.The lubricating oil is over thick or caking,please clean the screen and add new lubricating oil;

7.You can also add balance weight to increase the amplitude.

Besides,please also note that the adjustment of vibration source on vibrating screen(exciter or vibrating motor) must be same,or it will cause equipment damage.

Strict Inspection—Provide Perfect Equipment for Cients（Ⅱ）

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.

Do You Know the Application and Difference of Shaft and Shaftless Trommel Screen

Do You Know the Application and Difference of Shaft and Shaftless Trommel Screen

Do you know the application and difference of shaft and shaftless trommel screen? If not, following mentioned points are the matters, please attach much importance to them.

Trommel screen has two kinds of structures of shaft and shaftless. Both of them can be used for some common bulk materials, while according to the application working condition, the appropriate one must be selected for some materials with special properties.

Trommel screen with shaft

The drum is fixed aslope on the main frame. Motor, reducer and drum are connected by a coupling, and the driving drum rotates around an axis. Owing to the inclination and rotation of drum, the materials on the screen surface can move forward and roll. The materials will be divided into two parts: the qualified one will be discharged from the bottom hopper, and the unqualified one will be discharged from the end outlet. The rotation of the material in the drum makes the blocked material bounce out of the aperture, preventing the mesh blocking.

Trommel screen with shaft is generally used for screening granular material with large density, such as: sand, coal, limestone, fertilizer, compost and mineral, etc.

Shatless trommel screen

The shaftless trommel screen is installed horizontally. Generally, the rotate speed of the drum of motor wheel gear or motor chain is very slow, and the length of the drum can be designed longer to increase the screening efficiency. There is a delivery plate inside the drum, which can make the material move forward. The material which is larger than mesh size will be discharged at the end outlet, and the material which is smaller than mesh size will be discharged at the bottom discharge hopper. If the material is household garbage, a cutting tool is also can be added to rive some plastics bags, etc.

Shaftless trommel screen is usually used for screening material with small density, such as: waste, wooden chips, activated carbon, fertilizer, construction material, chemical material, etc.

Strict Inspection—Provide Perfect Equipment for Clients

Strict Inspection—Provide Perfect Equipment for Clients

After the circular vibrating screen production was completed,and there is an important step before delivery goods,that’s test running,and judge the equipment whether can work normally through equipment running condition,please see following test items:

1.Measuring rotary speed of principal shaft

The test principle is through infrared sensor scanning a fixed point on the shaft to confirm the rotary speed.Firstly,pasting the measured speed tags on rotor surface.then running the equipment,after the normal running，let the tachometer probe aims at one point on the tag movement locus,record the data,and it requires multiple measurements to take average.

2.Noise test of equipment running.

A good equipment should work without abnormal sound,after the equipment running normally,place the noise meter probe near the running parts of vibrating screen,record the data, it requires multiple measurements to take average.

Some Methods of Cleaning Stainless Steel Vibrating Sieve

Some Methods of Cleaning Stainless Steel Vibrating Sieve

Stainless steel vibration sieve will become matt if they are used for a long time, when screening materials with chemical reactions (such as corrosion) ,there would be a passivation film on the surface, it will exist steadily as a shape of the oxide in the nature. In other words, though stainless steel working conditions and oxidation are not the same, they will be oxidized in the end, this phenomenon is often called corrosion. The metal which is exposed in the corrosive environment, it will produce electro-chemical or chemical reaction on the surface of metal, even corrode. Corrosion resistance abilities of vibrating sieve passivation film are weak, due to stress caused by pitting corrosion reactions, it will generate small holes, coupled with the approach of chloridion, it will form a strong corrosive solution, which will accelerate the corrosion reaction rate, as well as the corrosion cracking inside the vibrating sieve, all of these will have a destructive effect on the surface of the stainless steel vibrating sieve.

Therefore, stainless steel surface needs cleaning and maintenance punctually, especially in the corrosive environment to ensure its beautiful surface and extend the use life. It is necessary to pay more attention to not scratch the surface during cleaning, and please avoid cleaning the surface by using liquid bleaching composition or abrasives, steel wool and abrasive stuff, in order to clean up the washing liquid, please clean it with water again after finishing scrubbing the surface.

I hope you can get some useful information.

What Should We Notice When Operate the Rotary Valve

What Should We Notice When Operate the Rotary Valve

Please pay attention to the following operation notes,hope it is helpful for you:

1.If motor is overheat when start up,please stop and inspect it, in order not to affect normal operation of the reducer.

2.Reducer must be operated as per the operating manual and the rotating direction must rotate according to the arrow direction as shown.

3.If powder leakage phenomenon occurs on the shaft, please tighten the packing gland bolts at both ends.

4.During operation , check bearing heating circumstance, general bearing temperature rising shall not be over 60 ℃.

5.During operation, if abnormal vibration occurs, please stop the machine and eliminate the abnormal phenomenon.

6.If there is bolt looseness in the process of operation, please tighten the bolt.

More information,please click: www.pkengineeringsol.com

How to Select and Install Screen Cloth of Linear Vibrating Screen

How to Select and Install Screen Cloth of Linear Vibrating Screen

The selection and installation of screen cloth is very important for linear vibrating screen. Select the most suitable screen cloth and install it according to correct way can improve the performance and prolong the service life of the linear vibrating screen.

1. How to select the most suitable screen cloth?

a. Because it is complicated for screen cloth installation of linear vibrating screen, we should select the screen cloth with thicker wire diameter.

b. While cutting screen cloth, we should keep the width of screen cloth consistent with the mesh frame, length should be 50-70mm longer than mesh frame.

2. How to install the screen cloth of linear vibrating screen?

a. Since the tensity of screen cloth will affect the screen efficiency directly, we should keep the screen cloth tension during installing the screen cloth.

b. Please confirm whether needs to add the bouncing balls according to mesh size and difficulty level of the screened material.

c. We should add suitable supported mesh size under the screen cloth if the mesh of the screen cloth is high or bulk density of the material is big.

d. While install the pressing plate, we should keep the flatness of the plate and line with strong scalability sponge sealing to lock it uniformly.

e. After completing installation, we should test the condition of feeding material and screening with few materials. If materials run forward uniformly, classify accurately without mixing phenomenon,linear vibrating screen can be used well. If not, we should adjust the linear vibrating screen mesh and test again.

Application & Development of Vibrating Screen in Food Industry

Application & Development of Vibrating Screen in Food Industry

Vibrating screen used in food industry is a kind of high efficiency screening machinery for high precision fine powder and other materials , which is easy to operate, fully enclosed structure, 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 which are commonly used in daily life,vibrating screen will be a good helper. 

Take starch or rice powder as example, usually the first procedures : impurity removal of raw materials - screening-weighing;secondly , soaking- coarse grinding-germ separation-fine grinding-screening of starch-protein separation-centrifugal dewatering- thermostatic drying, lastly,weighing-product packing. We can not imagine how to deal with the screening in the process of food without vibrating screen. Vibrating screen overcomes the difficulty of fine material screening easily, which also makes food diversified and entire food industry develop rapidly.

Mentioned Points on Vibrating Feeder

Mentioned Points on Vibrating Feeder

1. In order to ensure feed materials uniformly and prevent materials flow automatically, the vibrating feeder should be installed horizontally. If feeding ordinary materials, users can install the feeder declined 10 degree; declined 15 degree is alright if dealt with viscous material or larger water content materials.

2. There should be 20mm moving clearance after installing vibrating feeder. Suspension device should adopt flexible connections.

3. Please tighten all bolts before commissioning with non-load, especially the vibration motor bolt. It’s better to tighten the bolts again after 3-5 hours of continuous operation.

4. When making a commissioning, two vibration motors must rotate reversely. Inspect the stability of current and noise, please stop it if there is abnormal situation.

5. Please add lubricating grease to motor bearings every 2 months. During hot season, every month should be added.

Possible Reasons Cause Linear Vibrating Screen Mesh Blocking

Possible Reasons Cause Linear Vibrating Screen Mesh Blocking

Due to different material properties, their shape is also different, so it will generate all kinds of mesh blocking forms. Her PK Machinery analyzes the reasons lead to this kind of problem, please see the following points:

1.It contains a large number of particles which approaches the point of separation.

2.Water content of materials are too high.

3.Spherical particles or materials have multiple contact points with sieve.

4.Materials can occur static electricity.

5.Material has fibrous attribute.

6.There are many flaky grain.

7.Wire diameter of woven mesh is too thick.

8.Hole-shaped of mesh sieve design is unreasonable, making particles get stuck.

Screen Sesame, Prefer Linear Vibrating Screen

Screen Sesame, Prefer Linear Vibrating Screen

Previously, most of farmers always let sesame shell dry in the sun, the the sesame will come out naturally. For the purpose of improving the separation efficiency, we recommend linear vibrating screen to our customer. Linear vibrating screen is mainly used to solve screening problem of particulate material, it can separate sesame shell and sesame seeds successfully.

With regards to this vibrating screen, materials are discharged to inlet of linear vibrating screen from vibrating feeder evenly. After that, materials can pass through different size mesh to generate different specification materials and be discharged from different outlet. It has features of low consumption, high productivity, simple structure, easy to maintain, total-enclosed, discharge material automatically, etc. The highest screening mesh is 400 meshes, can screen 7 different particle size of materials.

Operating Principle and Property of star discharger

Operating Principle and Property of Star Discharger

Star discharger is a device that store or feed materials. Typically, star discharger is made with rotary wheel with a number of rotor blades, housing, seals, reducer, motor and other components.

Operating principle of star discharger: when star discharger works, dust falls by gravity, then it will be full of star blade space both top and side. Blade rotor of star discharge is rotated by drive motor through reducer, then the impeller will move to the bottom and dust will be discharged by their own weight.

In the outlet of bag filter and cyclone dust collector is equipped with a star discharger, it can discharge the dust timely and ensure air tightness of dust removal system. Star discharger is the most advanced discharging device, commonly used in dust removal system as the most important equipment, which is particularly suitable for dust, small particle materials, so it has been widely used in metallurgy, chemical industry, food, cement, drying equipment and other industrial sector projects.

Different Types of Screen Mesh

Different Types of Screen Mesh

Vibration screen mesh plays a very important role in vibration screen. If users choose a wrong size screen mesh, it will affect screening efficiency. What’s worse, it will damage mesh. Here we will introduce different types screen mesh.

Woven screen: It is mainly used to screen materials with small proportion. Common materials of woven screen are stainless steel, low carbon wire mesh, galvanized wire mesh and wire screen mesh. According to different material particle size, density, capacity, material characteristics, users can select different screen mesh, mesh size, wire diameter size.

Punching screen: Its main lifespan is related to its thickness. Different mesh number should be matched with different sheet thickness. The most important advantages of punching screen is that it can determine mesh shape of punching screen according to the shape of materials.

Welding screen: It is used to screen ore, coal, etc. Screen mesh is welded by steel plate.

Small Part has Great Effect: Damper

Small Part has Great Effect: Damper

Do you really know vibrating screen damper? It is used to limit circular vibrating screen to move lateral. You might confuse that does vibrating screen have lateral move? Theoretically it doesn’t have, but it is proved that there exists this kind of situation, the reasons are as follows:

1.Uneven distribution screening materials: If the material distributes unevenly, it will result screen box in a uneven loading condition, so there will be shock deviation in the horizontal direction.

2.Installation deviation. Circular vibrating screen needs to be installed horizontally. But during the installation process, it will inevitably be installation errors.

3.Stress error of vibration spring. We all know that measuring standard of vibration spring is just a reference value. So it is inevitable that vibration springs have stress error.

Screen box appears lateral deviation shock will generate great damage, thus if not promptly treated, it can affect the circular vibrating screen normal working.

How to avoid this situation? Here PK Machinery introduces a key component of circular vibrating sieve, that is damper.

As it is shown, the damper consists of adjustment bolts, flanges, spring base, springs, rubber base and rubber. When the screen box appears lateral deviation shock, its inside spring will generate a reverse thrust to screen box, and thus to limit screen box to move lateral and avoid the occurrence of lateral deviation.

Selection Methods of Gyratory Vibrating Sieve

Selection Methods of Gyratory Vibrating Sieve

Gyratory vibrating sieve is generally used for screening small granules, powders and other fine materials, such as urea, silicon carbide, activated carbon, quartz sand, salt, sugar, etc.

Structure features:

1. Gyratory vibrating sieve can be made 1 to 3 layers, and the mesh size can be provided on request.

2. Generally, the mesh material is made of stainless steel or can be selected according to customer’s requirements.

3. The screen is designed with self-cleaning device (bouncing balls) to prevent the phenomenon of blockage occurred in operation.

4. Overall structure of sieve can be engineered as open type or enclosed type.

5. The width of the screen surface can be designed from 1200mm to 2000mm, and the length of the screen surface can be designed from 3000mm to 4000mm or all of them can be non-standard design.

In order to provide the best design, please offer the following technical parameters:

1. Installation location and space limitation;

2. Material feeding type;

3. Screening capacity ____ t / h;

4. Material name ____ ;

5. The proportion of material _____ t / m3;

6. The percentage of the particle size distribution of the material ____ ;

7. Material temperature _____ ℃;

8. If you need supporting feeding device or discharging belt conveyor, please send us the layout of production line, we will design the best solution for you according to requirements.

New Dust Removal Method of Vibrating Screen

New Dust Removal Method of Vibrating Screen

The majority of dust removal method in our country is bag filter technology. Its advantage is high working efficiency, but it has large investment. To solve this kind of problem, we have developed a new dust removal method of vibrating screen. It has advantages of high efficiency, lower investment cost, longer service life, etc. 

 

The new dust removal method includes two times dust extraction. First time to remove dust is that based the equipment on vibrating screen, then the collected dust will directly come within the vibrating screen. The secondary is to put the dust removal equipment beside the vibrating screen and remove dust separately. 

Primary dust removal: the supported type vibrating screen should be sealed, and layout one dust filter on the vibrating screen. Set efficient dust filter bag in the stream of dust filter to filter the dusted air, then dust will come within vibrating screen. 

Secondary dust removal: seal the supported type vibrating screen and primary dust connector, and open a hole on the sealer, then lead dust air spilled out from vibrating screen into secondary dust removal device by pipe. Set efficient dust filter bag in the stream of dust filter to filter the dusted air, then dust will be discharged separately.

Notes Before Commissioning of Linear vibrating screen

Notes Before Commissioning of Linear vibrating screen

1．In general, linear vibration screen is three-phase AC. Ensure power connection properly and there shouldn’t be conducting material. And users should use a professional electrical outlet of three-phase electric power. 

2. Engine base must be fixed firmly by bolts to ensure a same height both the front and rear support base. Keep inlet and outlet in the same level, otherwise it cannot reach ideal screening efficiency. 

3. Please inspect the flatness of sieve. Make sure that screen mesh can be installed properly on the engine base and keep the same horizontal. 

4. Please check whether all parts of linear vibrating screen are firm or not, all bolts must be tightened. 

5. Make sure that there is a 30-50mm gap between linear vibrating screen and surrounding fixtures and check clamps screws is tightened. 

6. Before turning on the linear vibrating screen, take transport support off firstly, and add support until vibration machine is running smoothly. 

7. Please pay much attention to the machine and observe material trajectory after having turned machine on. Based on the trajectory, please adjust screening status.