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. 

Test During Commissioning

Processing of Conveyor Belt Roller

What is the Helpful installation tip 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. 

How to choose drag-chain conveyor

The reasonable selection of scraper and chain depends on its structure form, chain pitch, scraper pitch and material of construction. When choosing, people should pay special attention to meet the requirements of production capacity, and make the scraper & chain have the adaptability to material.

1. Selection of Scraper Structure Form
The scraper structure form determines the transportation effect of buried scraper conveyor. It could get a good effect through the reasonable selection of scraper. Otherwise, the improper selection of scraper may cause poor transportation effect, even failure.

On the condition of meeting the adaptability to material, the selection principle is to choose the scraper simple in structure. In the specific use, the scraper can be chosen according to the material features (viscosity, suspension property and fluidity), conveyor trough width and conveyor arrangement form.

1) The material has good transportation property: the scraper in simple shape is preferred, such as T-type, V-type, U-type, etc.
The material has small internal friction coefficient, strong suspension property and high fluidity: complex shape scraper should be used, such as H-type.

2) The material has heavy viscosity, or the viscosity becomes big after the material moisture absorption: in order to reduce the material adhesion on the scraper, and unload and clean material easily, it is better to choose simple structure scraper, such as T-type, V-type, U-type, etc.

3) The material is easy to float chain: the scraper can be inclined position welded.

4) The trough width of buried scraper conveyor is smaller: it is appropriate to use simple shape scraper. When the material with large bulk density is transported in bigger conveyor trough, in order to increase the scraper rigidity, it is recommended to use O-type scraper with diagonal strut.

5) The buried scraper conveyor is horizontal installation: T-type, U-type or V-type scraper is generally used.
Conveyor vertical installation: V-type and U-type scrapers in outward form arrangement are usually chosen.
Z-type buried scraper conveyor: V-type scraper in inward form arrangement.
Ring-lock (MK type) buried scraper conveyor: V-type scraper in outward form arrangement.
Planar ring structure (MP type) buried scraper conveyor: L-type scraper in outward form arrangement.
Facade ring structure (ML type) buried scraper conveyor: V-type scraper in outward form arrangement. 

Wish you a Merry Christmas and Happy New Year

Christmas is coming soon,PK Machinery wishes you peace,joy and happiness through Christmas and the coming year.So as to thank for the trust and support of our valuable customers, PK Machinery will promote some activities. Promotional activities are as follows:1.According to different configurations, we will quote our best discount based on the original price of screening and conveying equipment.2.We will provide site planning and design to customers for free.Hope above favourable activity will promote future cooperation, we just want to give a gift to our customers in the New Year!Further information please check:http://www.pkmachinery.com/news/merry-christmas-happy-new-year.html

Got inflexible rotation problem of conveyor roller? Check here

Please ensure Sealing and lubrication

In addition to ensure the quality of fabrication, it also requires a better lubrication material, such a

s lithium base grease which can improve the bearing lubrication performance to prolong the service life of roller.Please ensure the accuracy during conveyor roller fabricating process 

For example,the inner hole precision of punch bearing housing should reach grade 3, dimensional tolerance,coaxial degree and ovality of the pipe body two ends must conform to the national standard,can not exceed the tolerance. 

Bearing seat should adopt labyrinth seal structure of centripetal ball bearing supporting and plastic sealing ring

Portable belt conveyor,you best choice!

2 Parts Lead to Belt Conveyor Roller Inflexible Rotation

During the use of conveyor roller in our daily life, inflexible rotation phenomenon occurs sometimes during the operation, do you know what reasons lead to inflexible rotation? PK Machinery will introduce as follows:
1.Belt conveyor idlers manufacturing quality 
Main problems of manufacturing problems includes: bearing lacks of rigidity, roller assembly accuracy is hard to ensure.
2.Sealing, lubrication and maintenance
Since belt conveyor working environment is relatively bad, in general,operation occasion is very dusty, and the bearing sealing type has big influence on roller operation flexibility. If sealing is poor, dust can easily enter into the bearing inner which causes inflexible rotation; besides, if bearing grease adopts common calcium base grease ,it is easy to change color and become dry, the lubrication effect will decrease.

Hope above mentioned are can offer you a big help,further information,please click: www.pkmachinery.com 

 

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.

The key points for screw conveyor selection

1.Conveyor capacity
Screw conveyor conveying capacity refers to the amount of material per unit time.Users should consider whether the conveyor can support the use of other production equipment before design in order to design a reasonable conveyor model.
2.Conveying speed
Conveying speed can improve the transmission capacity. For conveyor which adopts chain as traction, the transporting speed should not be too fast, in order to prevent the power load increasing .
3.Component dimensions
The component dimensions of conveyor includes conveyor trough width or pipe diameter , etc. Which directly affect the transmission capacity of screw conveyor.
4.Conveyor length and inclination
Conveyor length and inclination directly affects the total resistance and required power of the conveyor. Screw conveyors installation can be level and inclined, so please let us know the using condition when select the model.
5.Screw conveyor motors
Motor selection can be speed controlled motor or general motor to control the conveying speed and throughput per hour.
6.Others
Whether hopper should be considered in the inlet or not,as well as the feeding hopper size.  

The role of drum screen in the food processing industry

Drum screen produced by PK machinery is widely used in coal, mining, power industry, but nowdays it is more used in grain processing and act as an immense role.

The pore diameter is a bit larger than the biggest particles in grain purification processing, its role is to let the food particles and smaller impurities go through sieve pores and down, while the large size particles as oversized things was discharged, feed the grain into the sieve, it will move with little impurity through the pore, the large impurity like paper, hessian cloth, fag end, masonry plaster, wood and long straw as oversized things discharged, the small impurities such as dust and sand will be filtered out by the sieve on the exit.the grain is discharged with strong suction process, the major part of the drum screen is perforated screen which is the horizontal drum, outside is a brush fixed to clean the pore, beside this there is a suction equipment to removal the dust.

The drum screen is acting as a cleaning equipment before grain flow in silo, large capacity and easy conduct will increase the work processing 

How much knowledge do you know about belt conveyor magnetic separator ?

When customers purchase belt conveyor, they only provide conveying material name, but seldom mention whether the material contains other impurities or not.For example, if long and big iron contained in the material, it will be easy to scratch the conveyor belt, so magnetic separator plays an important role.In this article,we will introduce the magnetic separator as follows:
Magnetic separator is applicable to various fields deironing, which can realize continuous iron absorption and removal.
Please pay attention to the conveyor belt, bandwidth, dip angle, material properties, moisture, material thickness an iron content percentage, the nature of the magnetic material, as well as the deironing requirements and the environment condition to select a suitable magnetic separator.
Magnetic separator can remove the ferromagnetic impurities which are mixed in material, to ensure the safe and normal transmission system work of the crusher, grinding machine and other mechanical equipment,at the same time it can effectively prevent belt scratch caused by the large, long iron besides,the grade of raw materials can be significantly improved.

Application of Sidewall Belt Conveyor in Thermal Power Plant

1.Requirements
Sidewall belt conveyor is the major equipment to convey coal and lime-ash in thermal power plant. Therefore it has high requirements for the security of equipment. Generally speaking, the whole transit line is equipped with twin channel sidewall belt conveyor, one is put into use, another is as standby application device. Thus, this coal handling system must be equipped with sidewall belt conveyor with 2500m-3000m length. Applying sidewall belt conveyor to thermal powder plant, it can not only simplify procedure, but also save cost.
2.Features
Due to power plant has high requirements for the security of equipment, technical requirements of sidewall belt conveyor are as follows:
1) It has different requirements for belt conveyor when it used to receive, convey or discharge materials. For instance, if the belt conveyor is used to receive materials, the belt speed of it shouldn’t be too high. If it is used to convey materials, it requires that trough angle of idler decrease properly. If plow discharger is put into use, the cover rubber of belt surface should be thicken properly.
2)The belt speed should be low. Belt conveyor is mostly arranged in workshop, so it has high requirements for coal dust control. According to domestic and foreign practical experience, it’s better to adopt lower speed.
3)After installation of this machine, it seldom changes its layout.
4)Different coal type has different requirements for belt conveyor. For example, large coal particle size needs impact idler with high quality. Coal with less water and more dust needs guide chute with good sealing. 

Save money if you consider the following bucket elevator design factors!

What notices should we pay attention to bucket elevator design? Please see the following :

1.Material temperature should be considered when choose bucket elevator belt : Ordinary steel cord belt is suitable for material with temperature lower than 80 degree. Heat- resistant steel cord belt is suitable for material with temperature lower than 120 degree. 

2.Uneven feeding material and lump size should be considered: the allowance of the bucket elevator capacity should be sufficient.

3.Driven device support frame and maintenance platform installed on the head casing should be considered: Customer should state whether need the maintenance platform according to requirement.

4.Dust removal flange on the head part of the bucket elevator should be considered: You can connect with dust collector if the material with large amount of dust. 

5.Following information should be considered: material name, size, bulk density, temperature, moisture content, lifting height, feeding equipment name, working indoor or outdoor.

Belt conveyor tripper and circular screen for wooden chip were delivered to Thailand

On 11th December 2015,circular vibrating screen,belt conveyor with tripper used for wooden chip production line were loaded to containers in PK Company from Qingdao Port to Bangkok PAT Port.

Circular vibrating screen is designed to separate wooden chip size larger than 50mm and stone size smaller than 4mm.While the 1000mm and 650mm belt width conveyor with tripper will be placed on the warehouse top for the purpose of conveying wooden chip in order to achieve the fully utilization of warehouse storage.

Meanwhile,metal detector,permanent magnet will be installed at the feeding end aiming at preventing materials from metals,metal detector and drum separator are used for the purpose of eliminating the metal in the production line.They are also required by clients.

With the development of our company, we can provide the best products and service to our customer. Any enquiry, feel free to contact us:www.pkmachinery.com

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.

Further information please click:http://www.pkmachinery.com/faq/solve-damp-material-blockage-vibrating-screen.html

How to solve copper powder blockage problem of rotary vibrating screen?

Change the way net-cleaning of the screen:

1, main Copper powder is constantly beating elastic balls prevent occlusion mesh material to reach NET-cleaning purposes. But in the process of using mesh blinding especially serious, indicating that this programme was not obvious, and bouncing the ball bouncing high and difficult to control, easy to create the screen damage.

2, using ultrasound instead of bouncing ball net cleaning device, its basic principle is: ultrasonic vibrating transducer with high frequency electric power generation through transformation in high frequency sinusoidal form of longitudinal oscillations, these oscillations are passed on to the resonator resonator resonance, then by the resonance vibration even transmitted to the screen. Keep the item on the screen remains in a suspended state, inhibits adhesion, friction, pancake and blocking network factors such as reunion, effective screening and net-cleaning purposes.

3, and regulation spin vibration screen heavy hammer angle: regulation heavy hammer of phase angle on can change screen online material of movement track and stay time, phase angle is less than 15 °, powder in screen online stay of time shortest, screening efficiency not high, only applies Yu General General screening; phase angle for 45 °, powder in screen surface Shang stay of time most long, for fine screening; Dang phase angle is greater than 45 °, powder run track tocenter closer, for special screening. Spherical solder powder not only screening accuracy is above 90%, oxygen content not exceeding 0.1 ‰, but also ensuring screening efficiency, so powder on the screen time is not too long and not too short, too short screening efficiency and accuracy are not up to, too much oxygen content.

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. 

Further information please click: http://www.pkmachinery.com/faq/installation-circular-vibrating-screen-punching-mesh.html 

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. 

Do you want a suitable screw conveyor?Check the required data for model selection.

Please see following data:
1. Material to be screened _______
2. Material size _______mm
3.Size distribution_______%?
4 .Water content  _______%?

5 .Capacity________t/h
6 .Material density ________t/m3?
7 .Material temperature _______ ℃?
8. Material is corrosive or not_______?
9. Distances between inlet and outlet ______m
10.Voltage __V__HZ 3 phase
11.Working environment _______

12.Special requirement:____

Above mentioned information is the basic one client need to offer which will save lots of time and money for model selection,further information please check: www.pkmachinery.com

Conveyor Rainproof Cover has been delivered to Madagascar

Last week, Pieces conveyor rainproof cover  was delivered from Shanghai Port to Toamasina port which was ordered by our Madagascar customer.

The thickness of conveyor rainproof cover is 0.8mm, which will be mounted above the belt conveyor with belt width 800mm, 1000mm and 1400mm belt width. Meanwhile, the quantities of conveyor rainproof conveyor are 490 pieces, 110 pieces, 40 pieces respectively.

Conveyor rainproof cover is suitable for 500/650/800/1000/1200/1400/1600/1800/2000mm width belt conveyor in power station, cement plant, steel mill, chemical plant, port, dock, mine, coal plant etc.,we provide fixed type, whole open-close type, particle open close type, deviation conveyor hood,any interest please contact us: www.pkmachinery.com 

Material Analysis before a Screw Conveyor is being used

The initial step in engineering a screw conveyor is to analyze the material being handled anf as certain its physical properties in order that they may be thoroughly evaluated and understood prior to proceeding with the conveyor sizing and selection. The properties of the materials are discussed in further depth below.

1.Lump Size

The minimum diameter of a conveyor screw for a given application is determined by the maximum lump size of the material being handled. It is necessary to thoroughly analyze the material and determine its maximum lump size and the percentage of lumps to total volume along with the minimum particle size and screen analysis when possible. 

2.Flowability

The flowability of a material will affects the horsepower requirement of the conveyor in question. Flowability is related to the angle of repose of a material. Fine free flowing materials can be handled at higher trough loadings with lower horsepower requirements than coarse, sluggish ones. 

3.Abrasiveness

The more abrasive the material being handled, the greater the wear the conveyor components are subjected to. Hence, it is necessary to determine the abrasive quality of the material in question prior to sizing the conveyor. Abrasiveness can be determined by knowing a material’s hardness. 

4.Moisture Content

Moisture content of materials is a factor that affects material flow. Excessively dry or wet products tend to flow easily. However, many develop sluggish characteristics when having moisture content between the two extremes. This is not accounted for in the material tables which follow and such materials should therefore be reclassified. 

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. 

Basic Type of Scraper and Chain Used for Buried Scraper Conveyor

As the traction and load-bearing components of buried scraper conveyor, scraper chain subassembly is generally welded by different types of scrapers and chains, or one-piece casting.
Subject to the gravity and conveyor trough, the material is transported by the thrust from scraper chain subassembly, as well as the friction and lateral pressure caused in conveying process. Therefore, the appropriate selection of scraper & chain influences the conveying and operating efficiency greatly.

 

According to different material property, conveyor trough width and capacity, various types of scraper and chain are chosen to meet the actual operation requirements.
1. The basic type of scraper
Scraper can be classified according to their shapes. There are flat scraper (T-type), framework scraper (U-type, V-type, H-type), side-pull scraper (L-type) and solid angle shape scraper, etc.
U-type and V-type scrapers are most commonly used, and suitable for horizontal, inclined and vertical transmission. 
T-type and L-type scrapers apply to horizontal transmission.
H-type scrapers are appropriate for square cross section conveyor.
Other special type of scraper, such as cleaner scraper, which bottom margin and broadside are installed with rubber sheet, neoprene sheet, leather sheet or canvas sheet, is used to remove the residue remained in the conveyor casing. In order to prevent most viscous material bonded in the inner wall of casing, the manufacturer can install a cleaner scraper every 5 ~ 10 chain link. 
2. The basic type of chain
There are three types of chains used for the buried scarper conveyor, bush roller chain, die forging chain and double chain.
Bush roller chain has the features of flexible rotation, low friction in meshing process, low specific pressure and small abrasion. While the chains must be replaced in pairs because of its heavier weight.
The characteristics of die forging chain are simple structure, light weight, high strength, reliable operation and convenient assembling & dismantling. 
The pitch of double chain is big, so it has the advantages including high carrying capacity, reliable operation and convenient assembling & dismantling. But the disadvantages are heavy weight, and can’t be designed according to equal strength.  

What is the Classification and Role of Fixed Belt Conveyor Roller?

Conveyor rollers are widely used in coal mines, metallurgy, ports, construction, electricity, chemistry, food packing and other industries,the classification includes: trough roller,parallel roller,self-aligning roller,impact roller,return roller,transition roller, comb type roller and screw roller, here PK Machinery will list the role as follows:

1.Trough roller is known as carrying roller which is used for carrying bulk material;
2.Parallel roller includes upper and lower types,upper one is used for carrying materials, lower one is to support the return branch of the conveyor belt;
3.Selfaligning roller includes taper aligning supporting roller and friction aligning roller,they aim to adjust the belt deviation to ensure the belt smooth operation;
4.Impact roller is installed in the lower part of the conveyor belt, aiming at reducing the belt impact to prolong  the service life of the conveyor belt;

5.Return roller supports the conveyor belt of lower branch,it can reduce the conveying belt deviation possibilities;
6.Transition roller is installed between the drum and the first set of roller, which makes the conveying belt gradually turns into flat shape and reduce additional stress , meanwhile it can prevent the material spreading phenomenon.
7. Comb type roller and screw roller, which can remove the sticky material on conveyor belt to keep the conveyor belt clean. 

Hope above mentioned are helpful,any other problem,please let me know.