Test During Commissioning

A commissioning test video for a wooden chips circular vibrating screen, which will be delivered to Thailand. After assembly, each set machine muct be test running in our workshop. During commissioning, the Quality Control Engineer will inspect each technical parameters, to guarantee the equipment be qualified.

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 feeder

Differences between the YK and YA circular vibrating screen

When customer choose and buy circular vibrating screen, YA and YK series of vibrating screens are optional. So what's the difference between the two types of vibrating screen? Which series should choose? Here,PK Machinery answers for you.
In general,YA and YK belong to circular vibrating screen series, YK series block type eccentric circular vibrating screen is updated products of YA axis eccentric circular vibrating screen.

 

According to the research,development and the application level of domestic and overseas vibration machinery , bring in the advanced technology in the same industry of Germany, Japan and other countries, combine with the actual running environment,our engineers fully optimize and design a new type of high efficient YK series vibrating screen.
In addition,retaining the feature of the original YA type axial eccentric circle vibrating screen,YK series circular vibrating screen has the following significant advantages:
1.Exciter adopts eccentric block form which not only makes the single heavy exciting force of the eccentric exciter weight increase, but also exciting force can be randomly controlled, so it is easy to modular design and use;
2.Simple machine structure is beneficial to improve the level of equipment manufacturing technology and assembly accuracy;
3.Using the flexible connection of cross axle cardan shaft or rubber coupling etc which makes running smooth;
4.Sieve machine is more efficient with greater capacity;
5.Using cycle and service life is longer;
6.Equipment maintenance will be simple and convenient,the machine running efficiency is improved significantly.

What reasons lead to material accumulation phenomenon of vibrating screen?

Some customers said material accumulation phenomenon occurred in the use process of vibrating screen, according to many years of analysis experience, the reasons can be summed up in four aspects:
1.There is a problem of vibrating screen mesh selection, too small mesh will cause a low rate of material passing through the mesh.
2. Check whether the ground level of the vibrating screen is flat or not, besides,high material inlet will affect the material running track, resulting in material tilting to one side.

 

3.Check whether the screen mesh and outlet are horizontal or higher than outlet or not, under normal circumstances, it should be horizontal or 6mm higher, the design is not the same according to different material discharging outlet.
4.There is a problem on the vibration motor angle adjustment, improper angle adjustment of vibration motor will cause material accumulation, if the angle is small,the material will spread outward quickly on the sieve surface,while if the angle is large, the spreading speed will be slow. If you have strict requirements of screening accuracy, the angle can not be too small so as not to affect the screening precision. In general, the vibration motor angle of the vibrating screen is 45 degrees when leaves the factory.
Users can also change the vibration motor angle to 100 degrees according to the the special requirements of the material ,and then material will be concentrated to the central screen mesh. 

How to choose the suitable vibration motor for the vibration machine?

Vibration motor has many types and models with a wide application,it is usually applied with the feeder, vibrating screen combination. The vibration motor is very important in the vibration machine. It directly determines the working efficiency of the vibration machine.The vibration mechanical vibration motor selection steps are as follows:
A.According to the operating requirements, confirm the required vibration of the frequency (r/min) and the amplitude Ym (mm).
Such as the six vibration motor (n=960r /min) can drive the vibration chute, vibration feeder, vibration mill, vibrating screen etc.
B.According to the structure of the vibration machine itself, get the vibration weight G (kg) and calculate the required vibration force Fm (N) .
C.According to the vibration of the operation to get Fm, you can get the model of the vibration motor, please pay attention to the exciting force FH is larger than Fm.
D.Design the overall structure, and calculate the actual vibration parameters, after the calculation, if the vibration motor is too large or too small, motor model should be re-selected.
E.Design of vibration isolation system. 

How to solve problem of damp material blockage occurs in vibrating screen?

Vibrating screen is a kind of high precision and fine powder screening equipment, with the characteristics of low noise, high efficiency, small size and quick screen mesh replacement,it adopts fully enclosed structure which is suitable for particles, powder, liquid, etc. Clients ever said wet material blockage occurred in vibrating screen,here PK Machinery will list some suggestion,hope it is helpful.
1.Increase the excitation force of vibration motor and increase the amplitude.
2.Increase the vibration frequency, please use the high-frequency vibrating screen.
3.Diluted with water to increase the liquidity of material.
4.Replace the screen mesh regularly to avoid damp material blockage.
5.Manual work assisted cleaning up the screen mesh blockage.
6.Equip with cleaning device, such as the brush.
Hope above mentioned are workable, if you have the other problems about vibrating screen,welcome to contact us freely.

Installation notice of circular vibrating screen punching mesh

General screen meshes include manganese steel woven wire mesh, punching mesh and stainless steel screen plate etc. Each kind mesh should be selected according to the on-site working condition. Today we will talk about the installation of punching screen mesh.
The punching screen mesh installation method for circular vibrating screen is the same with dewatering screen.
Generally speaking, the slurry dewatering screen is horizontally installed,however, in order to guarantee the application effect, the screen mesh is installed with a negative angle. The screen mesh can be polyurethane material with tension type installation, or stainless steel bar screen mesh with compression type to meet different working conditions.

 

Circular vibrating screen is installed with angle, when adopt the punching screen mesh, it needs lumps of wood to press tightly, then tension with wood key . Please see the following sketch: 
If the screen mesh tension is not enough, it will bring negative influence:
1.The screen mesh is easy to bend and the screen mesh will slack and easy to revibrate. Meanwhile it will reduce the screen mesh service life. 
2.It will influence the effective screen surface, reduce the screening efficiency.
3.It will stop the material moving forward and reduce the capacity.
In this regard,in order to guarantee the smooth screen mesh , increase the service life and guarantee the capacity and screening efficiency, the tension of screen mesh must be improved. 

Improve dry or wet screening efficiency of vibrating screen

Following methods can improve screening efficiency of vibrating screen:

1.For dry screening,we should strictly control the water content,for material with high water content,please consider screening with ingredients.
2.Reduce the of plugged hole,we can consider using the self-cleaning sieve plate,for example,for spring rod type screen mesh surface,we can add a prevent blockage device below the screen.
3.Improve the aperture percentage,high aperture percentage is beneficial to improve the screening effect.
4.Adjust the feeding way.Material can be fed according to the sieve surface width and ensure the sieve surface can be fully utilized.
5.If possible,please consider the dip angle of the screen machine,suitable angle is beneficial to reduce the thickness of material and achieve thin material screening.
6.For circular vibrating screen,we can consider adjusting the balance weight to improve the screening effect.
7.If possible, coarse screening before feeding material.
8.If possible, we can adopt wet screening,it’s the most effective way to improve the screening effect. 

circular vibrating screen

What factors affect vibrating screen purchase?

Please consider the following factors when purchase vibrating screen
A.Physical property of the material
Including material particle size, shape, moisture content, bulk density ,property ,etc. When the particle size is fine and mesh size is small, the screen efficiency will be lower, we need to select larger model for same capacity; when the moisture content is big, in general, the screen efficiency will be lower. However,if the mesh size is bigger, the influence of moisture content will be less; when the material with corrosion property, the material contacts parts usually need to be SUS 304 or whole machine is SUS304.

 

B.Screen surface character and structure
In general, if the material do vertical movement on the screen surface (such as linear vibrating screen,etc), the screen efficiency will be higher and the capacity is larger. If the material do reciprocating movement on the screen surface (such as gyratory screen,etc),the screen efficiency and capacity will be lower.
For certain material, the screen efficiency and capacity rate are determined by the mesh size. The screen efficiency is determined by the screen surface length, the longer screen surface length is, the higher screen efficiency will be; the capacity rate is determined by the screen surface width, the bigger screen surface width is, the higher capacity rate will be. 
C.Production condition
The screen efficiency will be lower when the load on the vibrating screen is big.Uniform feeding material also has a big influence on the screen efficiency. (For this question, PK Machinery designs a distributor above the inlet of vibrating screen to achieve uniform material feeding).
Only when we take all above factors into consideration,will we get a suitable vibrating screen that can meet our production efficiency. 

How to Adjust the Excitation Force of Vibration Feeder?

Due to the errors of previous parameters that clients offer and the material granularity and processing capacity per hour of actual production, clients can adjust the motor excitation force according to the following description in order to change the capacity vibration feeder.
The shaft for each end of vibration motor has a fixed eccentric block and an adjustable eccentric block, you can adjust excitation force by adjusting the angle between fixed eccentric block and adjustable eccentric block according to the needs,see table 1 and table 2.

Table1:

Table 2:

Adjustable eccentric block rotation angle	0°	60°	90°	120°
excited force	F	0.866F	0.707F	0.5F

Please switch off the power before adjusting the excitation force of the vibration motor. Remember, when adjusting the excitation force, the two vibration motor eccentric block position should stay the same , in case of imbalance phenomenon,and causing damage to vibration feeder. So generally it needs 10 mins to adjust the excitation force, after that you can switch on the vibration motor and adjust the eccentric block angle.

How to Select the Driven Device for Linear Vibrating Screen ?

Linear vibrating screen can achieve dry and wet screening,and also can achieve automation work on the working site. Here PK Machinery will talk about the driven device selection for linear vibrating screen. 
With regard to the material like ceramic, food, etc with small density,capacity and vibrating screen model, generally the screen surface length is <3000mm, screen surface width is <1200mm, and the weight of the vibrating screen is relative light, under such circumstances, the driven device of 2 sets vibrating motors rotate oppositely at the same time will be adopted. Motor installation on the bottom, upside or both sides of the screen equipment can be optional.

While the material like coal, mineral, building material, etc with large density, capacity and the required vibrating screen model, generally the screening surface length is >3600mm, screen surface width is >1500mm, and the weight is heavy. Under such circumstances, the driven device of 2 sets motors drive 2 sets vibrating exciter will be adopted. Vibrating exciters will rotate in different directions which can be installed on the bottom or the upside, then produce vibrating exciting force to achieve screening. 
If the working site’s installation space is limited, or there are some special requirements, we could optimize the design. 
If you have  any interest,welcome to contact us via info@pkmachinery.com or www.pkmachinery.com