How to Select a Proper Scraper Conveyor

1.Name of material __
2.Material density __ t/m3
3.Handling capacity of conveyor__ t/h
4.Temperature of material__℃.
5.Average particle size __mm, max.particle size__mm.
6.Level or inclined conveying?
If level, please inform distance between inlet and outlet__m
If inclined,please inform level conveying distance:__m,
Vertical height:__m
Inclined angle:__°
7.Voltage:__V, frequency__HZ,3phase,driving device brand:__
8. Ambient temperature__℃.

How to calculate the transmission capacity of the screw conveyor?

1, the density of material and property of the material

2, the selection of the screw conveyor model size and delivery distance, the installation direction, etc..

Approximate calculation formula of screw conveyor:

Capacity Q = 47 D2 N TΦP C（t/h）

Formula:

Q - transport capacity (t/h);

D - conveyor diameter m;

N-- screw shaft speed r/min;

T - pitch m;

Φ - material filling coefficient, under normal circumstances, the grain by =0.25 - 0.4, =0.25 - 0.35 psi oil, wheat bran, rice bran flourψ=0.25, ψ =0.2

P - bulk density  t/m3;

C - conveyor angle coefficient;

S - helical blade pitch (m), S=0.8D of the face, with a blade of S=D.

Calculation formula for ultimate speed:

Formula: N /min - helical axis limit rotational speed (Y);

A - the coefficient of the material properties, the general desirability of grain and oil materials is A=65.

Do you know difference of TD75, DTII and DTIIA series belt conveyor?

Specifications of TD75, DTIIA, DTII series belt conveyors are the national standard of China belt machine, which represent three types of conveyors.During the model selection,the standard should be noticed. How to choose a proper type to save client’s cost? The following is the characteristics of the three types of conveyors:
TD75 series conveyor is the first standard belt conveyor, it can be used to convey small lump, granular, powder material, due to simple structure, low cost, easy maintenance, convenient maintenance, and large transport capacity,TD75 series belt conveyor becomes a common machine,it can be single or multi sets running to form a horizontal or inclined conveyor system.
DTII series belt conveyor is designed according to the components. The designers can design and assemble the conveyor according to the requirements of transportation, different terrain and working conditions,it has a wider use compared with TD75 type.
DTIIA series belt conveyor a heavy duty machine is mainly used to transport large density, large transport capacity and long transmission distance, conveyor selection is determined according to many parameters.

 

Long life chain trough scraper conveyor

1. Scraper chain conveyor should be no-load running for a certain time when start the equipment every time, Then feed the material after the equipment working normally. We should keep feeding the material evenly, sudden feeding or over-load running is not allowed.
2. Should not stop the machine with load if there is no special condition.
Generally,we should stop the equipment when the material in the trough were discharged completely after we stop feeding the material.
3. If the whole production line is consist of sets of conveyor, we should
start the last set first when start the whole system, then start the others one by one . The order will be opposite when stops.

 

4. Operators should check the spare parts of the conveyor timely, especially the conveyor chain and driven device.
5. During operating, we should protect the conveyor from the iron, large hard objects and impurities to avoid damage the equipment.
6. Should keep all the bearing and driven device lubricated well. However, should not lubricate the conveyor chain, support guide rail, head wheel and tail wheel etc.
7. In general, the buried scraper conveyor should be minor repair every half year, medium repair every year and overhaul every three years. For overhaul the buried scraper conveyor, we should remove and clean all the spare part, replace all the wear part. For the motor and reducer, should be maintained and repaired according to their technical requirement.

Further information please check: http://www.pkmachinery.com/faq/long-life-chain-trough-scraper-conveyor.html 

 

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. 

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.  

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. 

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 that Affect the Screw Conveyor Conveying Efficiency ?

The factors are listed as follows:
1.The material has great viscosity and is easy to agglomerate. 
The viscous material is easy to stick on the screw blade and the inner wall of the screw conveyor, which will increase the resistance in the process of conveying, and directly affect the production efficiency.
2.The diameter size of the screw pipe.
Under the same conditions, conveying efficiency of the screw conveyor with larger diameter is higher than the conveyor with small diameter.

3.The dip angle and transportation distance of screw conveyor.
4.The particle size, temperature, moisture, abrasion and corrosion of the material.
Specific parameters can refer to: Screw conveyors and conveying technical parameters calculation formulas.
5.The rotate speed of the screw conveyor.
The rotating speed of the screw conveyor is related to the power of conveyor motor . The working speed of screw conveyor has a close relationship with the material characteristics. High speed screw conveyor requires strict assembly, and demands a better balance. 
Further information,please click:www.pkmachinery.com

Reason Analysis for Rubber Falling Off the Belt Conveyor Pulley

Rubber falling off the pulley is one of the common trouble of belt conveyor,after many years of practice and analysis, the reasons are as following:
1.The wrapping angle between pulley and belt is too small.
Peripheral force of driving pulley is transmitted to belt by friction.In running,in order to avoid slipping between pulley and belt,the belt tension is not allowed too big.According to Euler’s Formula,if the wrapping angle is smaller,the belt tension will be bigger,so it’s easy to slip.Slipping will speed up the wear of pulley.
2.Water or wet material stick on the belt surface.
When transporting material contents dust,like coal,ore and so on ,we usually use water spray to remove dust,thus water will be mixed with material and stick on belt surface,besides,rain will also lead water sticking on belt, once water sticks on belt surface,the friction coefficient between belt and pulley will decline which will cause slipping between belt and pulley,and speed up the wear of pulley.

3.The tension is too small.
Tension device is very important to conveyor pulley,if the tension is too small,it will lead to slip,causing wear of pulley,when the tension distance is not enough and the belt with permanent deformation,we can cut a segment of belt,then vulcanize again.
4.The failure of cleanser.
The failure of cleanser can result in the adhesive materials entering into belt and pulley,causing wear between belt and pulley, thus the rubber cover will fall off the pulley,and reduce the service life of belt.
5.Belt conveyor material scattering .
Belt conveyor material scattering is a common problem,when the material scatter during machine running,a portion of material will enter into belt and pulley,which will cause the wear of rubber surface and belt.

Why should we select bin above the conveying and screening equipment

Are you complaining the screening and conveying equipment you bought is not durable? Are you worried about equipment bearing capacity if you want to improve the production efficiency? Here we would like to give some tips for you:
No matter vibrating screen or belt conveyor, once they work with other corollary equipment, the joint parts are pretty crucial, the common one is hopper, it is not only because it can store material, but also can reduce the impact to screen mesh when feeding material, and increase the service life. In order to control the feeding rate of hopper uniformly, a electric or a manual gate valve can be added at the bottom of hopper, or a silo vibrator (we call it vibration hopper) to feed the material more uniform or vibratory feeder machine.
For example, one of our customers want a tilt screw conveyor, due to the small capacity, it needs to feed material to conveyor directly, we recommend placing a hopper on the screw conveyor in the purpose of storing material in order to ensure continuous working of screw conveyor and transmission efficiency of the screw conveyor.
During the use of conveying equipment, in order to improve the production efficiency of the conveying and screening equipment), it is necessary to put a hopper above the equipment. This will reduce the worker's labor intensity, the number of workers, the cost production line.