Chain Jump Treatment of Buried Chain Scraper Conveyor

When buried scraper conveyor chain jumping failure occurs, it is rarely happens that the chains of both sides are out of sprocket. Generally, single side chain sprockets meshing point will cause both sides chain dislocation and lead the scraper chain in the tilt state of operation. At this moment, stop and repair the machine in time will bring it back to normal running. However, if the failure is not found promptly, more and more serious dislocation could cause chain breaking, cast stone runnel box or chain way damage, and even burn the motor and turn over the base, thus extend the harm of jump chain failure.

The most common issue in the operation of buried scraper conveyor is chain jump and often occurs at the head and tail. While the causes are complicated, such as uneven lining slot box, partly cast slab laying off, gaps at chain way and some other reasons. After long time running, the head gear tooth and tail groove wear is also a factor causing this problem. In addition, when the large bulk materials are conveying, they might enter into the sprocket meshing point which can also cause chain jump.

Feeding Material in Proper Order of Buried Scraper Conveyor

Equipment failure happens when improper operation made in the running process of buried chain scraper conveyor. Please pay attention to the the material feeding sequence.

During material conveying, turning on the device at the first place and opening feed inlet afterwards. In this case, scraper conveyor would not be filled with material avoiding unnecessary losses because of overload motor. When material conveying finished, turn off the slide damperor or the power of the discharger firstly, stop material feeding and turnoff squeegee machine after clean up the material in the conveyor chamber. It will prevent the material accumulation in the equipment avoiding material moisture and agglomeration.

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How to Resolve Chain Deviation of Buried Scraper Conveyor

1. Check installation quality and take measures to correct mounting dimensions.

1) Check and adjust the flange connections between conveyor casings, make sure the connections are smooth and tightly sealed. 

2) Adjust the clearance between chain and conveyor trough. The appropriate clearance value will guarantee the conveyor to operate normally, reduce energy consumption, extend the service life of chain scraper & conveyor trough, and improve transport efficiency. 

3) Check and adjust the surface flatness of guide rail. The joints between guide rails should be smooth.

4) Check and adjust head and tail pulleys, which should be on one center line and correct meshing.

5) Correct and replace the deformed scrapers.

6) Repair and replace the worn-out guide rails.

7) Adjust the tension device, make sure the elastic of chain & scraper is moderate, and the tensile force of left and right sides are the same. 

2. Adjust material drop point.
Material impact is one of important factors that cause chain deviation. The solution is to install a retaining plate at the inlet. In this case, the material will fall in the middle position of scraper & chain to make sure the chain will be uniformly forced, so as to reduce chain deviation. 

3. Install baffle plates on both sides of the chains to prevent deviation phenomenon. 

Difference between forging and casting of scraper chain machining process

Forging and casting is commonly used in the mechanical processing of scraper chain, but do you know the differences? Today, PK Machinery will introduce it in details.
Forging is a processing method which uses the forging machinery occurs pressure to metal blank, make it produce plastic deformation to obtain a certain mechanical properties, a certain shape and dimension.
Casting is the process thatmakes the metal melt into a certain requirements of liquid and pour into the mold, after cooling, solidification, and cleaning the whole process to obtainwith a predetermined shape, size and performance of the casting (parts or blanks).
Generally forging chain mechanical properties are generally better than the same kind of casting chain, but the cost is higher. Although the cost of casting is low, but the production needs more materials and equipment, it will produce dust, harmful gases and noise which will pollute the environment, so we will choose forging chain as the traction component of scraper conveyor in most cases.

How to Choose the Scraper and Chain of Buried Scraper Conveyor? (II)

1. Selection of  Scraper Conveyors Chain
On the basis of meeting the adaptability to material, the chain should be selected reasonably according to maximum working load.
1) Bush roller chain should not be used for dust conveying, and should be first selected to transport the material which is easy to float chain. But in general, die forging chain is used as the first choose.
2) Base on the assurance of maximum chain working load, in order to maximize its carrying capacity,
it is best to use the chains which allowable load is close to maximum working load.
3) On the condition of meeting strength requirement, it should be try to reduce chain weight.
4) Different kinds of chains are used for different arrangement form.
MS / MC / MG buried scraper conveyors: three types of chains can be used, bush roller chain, die forging chain and double chain.
MZ / MP buried scraper conveyors: die forging chain
MK / ML buried scraper conveyors: die forging chain and double chain

2. Selection of Chain Pitch

The selection principle is to minimize the maximum dynamical load and up & down movement speed of chains. If the chain shake is too big, it will destroy normal material transportation, especially vertical conveying. And big dynamical load will lead to the increase of chain weight or decrease of its service life. 
3. Selection of Scraper Pitch
The scraper pitch can be determined according to the conveyor trough width, but it must be adaptable to chain pitch. If the scraper pitch is too big, it can lead to relative slippage between various material layers in conveyor trough, so as to increase energy consumption and even destroy normal material transportation. On the contrary, too small scraper pitch will increase the traction weight and energy consumption. 
The scraper pitch generally equals to chain pitch. When the load is small, the scraper pitch can be chosen the twice of chain pitch. Meanwhile the material features should be taken into consideration, for example, when conveying viscous material, the manufacturer can install a special form scraper, to remove the sticking of material inside conveyor trough, and prevent most viscous material bonded on the inner wall of conveyor trough.

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.

Selection principles of scraper chain

Scraper chain selection is mainly for the rational use of its structural type, chain pitch, blade pitch, scraper chain of materials and the like. In addition should be selected when the production capacity to meet the requirements, particular attention should scraper chain adaptability of the materials.

Scraper type often determines buried scraper conveyor conveying effect. The screed right choices, be satisfied with the delivery results; If you choose blade incorrectly can cause deterioration of conveying effect, can not even transport.
Type scraper blade choice is mainly to meet the conditions under the adaptability of materials, as far as possible to select the type of structure is relatively simple principle. Specifically selected, can be selected according to the material properties of the material viscosity, suspension and liquidity, machine groove width, conveyor layout and so on.

• pairs of conveying materials with better performance, giving priority to the use of a simple shape of the blade type, such as T-type, V-type, U-type; internal friction coefficient is small, the suspension is strong, mobility of materials should be used complex shape The blade, such as H-type.
• After delivery viscous or sticky larger absorbent materials, should adopt simple shape type, such as T-type, V-type, U-type, in order to reduce the material to adhere to the scraper, easy unloading and cleaning.
• delivery pressure knot strong chain or easily float material can be welded to prevent floating chain blade tilt.
• Machine groove width is smaller, the blade should use simple shapes. When transporting a bulk larger machine slot high density materials, in order to increase the rigidity of the blade, it can be used with a brace of O-type guillotine plate.
• buried scraper conveyor arranged horizontally (MS type), generally choose T, U-shaped or V-shaped blade; a vertical arrangement (MC type), generally V-shaped and U-selectable blade and are arranged for outward; Z-type arrangement (MA type), optional V-shaped blade, as introverted layout; buckle type arrangement (MK type), select V-shaped blade, as outgoing layout; flat annular arrangement (MP type), only You can choose L-shaped, outward arrangement; facade annular arrangement (ML type), optional V-shaped blade, as outgoing layout.
  

Introduction of Grain Scraper Chain Conveyor

CUSTOMER REFERENCE LIST (YEAR 2012-2014)
NO.	EQUIPMENT	VENDOR'S SCOPE OF SUPPLY	QUANTITY	TIME
		PROJECT LOCATION
8	Scraper Conveyor	Ukraine	1 Set	20120829
16	Scraper Conveyor	Russia	4 Sets	20121119
23	Scraper Conveyor	Russia	12 Sets	20130516
55	Scraper Conveyor	Pakistan	2 Sets	20150220

► Introduction
Grain scraper chain conveyor is a light type buried scraper conveyor. It is widely used to convey grain such as soybean, wheat, rice, flour etc. Compared to the ordinary type, the casing thickness of QMS type is smaller, thus lose the whole weight and save money.

► Working principle
When conveying in horizontal direction, under the constraints of material weight and casing sidewall, producing internal friction between the materials. The material can be conveyed forward along to the scraper chain, form a continuous whole material flow. When conveying in vertical direction, because of the constraints of material arch camber, weight and casing sidewall, producing internal friction that prevent the material falling down. The material can be conveyed upward along to the scraper chain.

►Features
1,Grain buried scraper conveyor is completely enclosed for clean plant operation
2.Large capacities for conveying in a compact space
3.Higher conveying speed
4. Can reach multipoint charging and discharging
5.Variety of side & bottom abrasive resistant steel liners
6.Liner fasteners that are positioned clear of material flow.

►Applications
It is widely used to convey grain such as soybean, wheat, rice, flour etc.

Introduction of Inclined Scraper Chain Conveyor

CUSTOMER REFERENCE LIST (YEAR 2012-2014)
NO.	EQUIPMENT	VENDOR'S SCOPE OF SUPPLY	QUANTITY	TIME
		PROJECT LOCATION
8	Scraper Conveyor	Ukraine	1 Set	20120829
16	Scraper Conveyor	Russia	4 Sets	20121119
23	Scraper Conveyor	Russia	12 Sets	20130516
55	Scraper Conveyor	Pakistan	2 Sets	20150220

► Brief Introduction:
Incline scraper chain conveyor is bulk material conveying equipment, which consists of head section with driving device, connect section, tail section, tension device, as well as scraper and chains.By means of moving chains, it can continuously transport the materials in closed rectangular casing vertically or at a large incline.
The MC buried scraper conveyor is widely used in cement plant, coal, metallurgy, mining, light, construction, chemical, grain, power industries etc.

►Operating Principle:
When scraper chain conveyor machine transports material aslant, the internal friction caused by three parts:the pressure which comes from chains in conveying direction to the materials, the action which comes from the materials themselves and the gravity of the material. This friction ensures the stable situation between material layers, and it can overcome external frictional resistance which caused by moving materials in the trough and make materials transport as a a whole fluid.
►Main Features:1.Totally enclosed structure, light weight, small volume. 
2.Convenient installation and maintenance. 
3.Vertical or large inclined transport from 30° to 90°. 
4.Multiple material feeding point and discharging point. 
5.Conveying distance is up to 40m with material temperature lower than 120℃. 
6.Widely used in cement plant, coal, metallurgy, mining, light, construction, chemical, grain, power industries etc.

Introduction of Horizontal Scraper Chain Conveyor

CUSTOMER REFERENCE LIST (YEAR 2012-2014)
NO.	EQUIPMENT	VENDOR'S SCOPE OF SUPPLY	QUANTITY	TIME
		PROJECT LOCATION
8	Scraper Conveyor	Ukraine	1 Set	20120829
16	Scraper Conveyor	Russia	4 Sets	20121119
23	Scraper Conveyor	Russia	12 Sets	20130516
55	Scraper Conveyor	Pakistan	2 Sets	20150220

► Brief Introduction:
Horizontal scraper chain conveyor is bulk material conveying equipment, which consists of head section with driving device, connect section, tail section, tension device, as well as scraper and chains.By means of moving chains, it can continuously transport the materials in closed rectangular casing horizontally or at a slight incline.
MS buried scraper conveyor is widely used in cement plant, coal, metallurgy, mining, light, construction, chemical, grain, power industries etc.
► Working principle :
When scraper chain conveyor transports horizontally, the pressure which comes from chains in conveying direction to the materials, and the action which comes from the materials themselves cause internal friction. This friction ensures the stable situation between material layers, and it can overcome external frictional resistance which caused by moving materials in the trough and make materials transport as a whole fluid.

► Features:
1.Totally enclosed structure, light weight, small volume;
2.Convenient installation and maintenance;
3.Horizontal or slightly inclined transport from 0° to 30°
4.Multiple material feeding point and discharging point;
5.Conveying distance is up to 80m with material temperature lower than 120℃
6.Widely used in cement plant, coal, metallurgy, mining, light, construction, chemical, grain, power industries etc.

horizontal scraper chain conveyor

► Advantages :

    1.Totally enclosed structure, light weight, small volume

    2.Convenient installation and maintenance

    3.Horizontal or slightly inclined transport from 0˚ to 30˚

    4.Multiple material feeding point and discharging point

    5.Conveying distance is up to 80m with material temperature lower than 120˚C

► Applications :
MS buried scraper conveyor is widely used in cement plant, coal, metallurgy, mining, light, construction, chemical, grain, power

What can we do to #maintain and #repair #scraper #conveyor #chain?

Scraper conveyor is widely used in food, cement, metallurgical and other industries. In the process of transporting materials, it is easy to mingle with impurities, which can cause wear of the chain. How to maintain and repair scraper conveyor chain properly? We will make a brief introduction as the following:
1.It is necessary to ensure that all pins and pin screws are fastened in place before using scraper chain conveyor. The tension of pin and the required torque, must be regularly checked and keep maintenance records;
2. In order to keep it running in good condition, please check and measure it periodically. Once scraper chain slack is found, or abnormal sound of guide rail rack hitting , please adjust the tension of chain in time;

 

3.When replace the chain, ensure the chain with the chain joints can move freely;
4. Check whether the head of scraper chain conveyor parts deformation or falls off or not.

 

#Note of #Operation of #Scraper #Conveyor

Have you noticed something of operation of scraper conveyor?What should we notice before using and during running it?
Before using the scraper conveyor, we must understand the characteristics of the conveying material, material with big lump, density and moisture content is not allowed to convey. Each type of scraper conveyor has it specific capacity, the conveying efficiency will be highest when casing is filled with material. In the process of using use scraper conveyor, if the operation is inappropriate, it will make the motor overload and affect the production, so please note the following points concerning the operation:
Operation notes before start-up
1. Check if the of central slot buckle connections are in good condition;
2. Check if the oil amount of lubrication part is enough;
3. Check if the connecting bolts of the head and tail section are firm;
4. Check the tightness of the scraper chain;
5. Check the cable and joint are in good condition;
6. Check if the sound is normal during operation;
7. After the completion of checking all above mentioned items, then the scraper conveyor can be put into use.

 

Operation notes during running
1. Check the cooling water ,gearbox and motor temperature during running at any time;
2. Check the if there is any abnormal sound of gearbox and other transmission components;
3. Idling running for several cycles before stopping the scraper conveyor in order to discharge the material inside the conveyor which is convenient for maintenance and another operation;
4. Material flow should be uniform in order to avoid overload operation;
5. Please observe if there is chain jumping during the operation of the scraper conveyor, once happens, please stop and check immediately.

Test running note of Scraper conveyor (II)

This article is the continuation of previous one. PK Machinery will introduce you load testing running of scraper conveyor.

Load test running 

1. Once no-load test running becomes normal , please test run with load.

2. After scraper conveyor runs with load normally, please feed the material uniformly to avoid blockage.

3. The casing must be fully sealed to avoid the material overflowing. A grate net must be added on the inlet to avoid massive material or hard objects enter into the scraper conveyor. 
4. After material inside the scraper conveyor is discharged from the outlet completely, then stop the machine. 
5. During no-load and load test running, please make a record that includes voltage, current, power and scraper chain running speed etc. and check whether they meet the requirement of design or not. 

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Henan Pingyuan Mining Machinery Co., Ltd is the most professional manufacturer of Belt conveyor, and Vibrating screen, Bucket elevator, Screw conveyor, Scraper conveyor using the world's most advanced technology, we are willing to serve every company to meet your custom needs. Our goal is "be the future global leader of mining machinery industry". Have any questions, please contact us without any hesitation.

Test Running Note of Scraper Conveyors (I)

PK Machinery offers horizontal scraper conveyors and inclined scraper conveyors, the angle can range from 0 degree to 90 degrees. Scraper conveyors are widely used for transporting cement, coal, metallurgy, mining, construction material, chemical, grain etc. There are two stages of test running: no-load and load test running. Here PK Machinery will introduce it in details:

Non-load test running

1.Check if there is any remaining tool, iron casting pieces and other hard objects inside the scraper conveyor, if any , please clear up. 

2.Give enough lubrication to all the bearings, driving devices and drive chain etc. 

3.Check if all the scraper conveyor parts are intact, whether the tense of scrapers is suitable or not. 

4.After finish checking the above items, then power on and switch off several times to see if the operation is normal, if normal, run the scraper conveyor continuously.

5. In addition, the head, tail , medium parts and other main structures, workers must be sent to observe the running , if any problems, please solve it without delay.

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Henan Pingyuan Mining Machinery Co., Ltd is the most professional manufacturer of Belt conveyor, and Vibrating screen, Bucket elevator, Screw conveyor, Scraper conveyor using the world's most advanced technology, we are willing to serve every company to meet your custom needs. Our goal is "be the future global leader of mining machinery industry". Have any questions, please contact us without any hesitation.

High performance conveyor-Buried Scraper Conveyor

     With regard to scraper conveyor, there are many types. Buried scraper conveyor belongs to it.The main features of buried scraper conveyor are that can be in a slant or vertical angle and operate together or individually. So it is universal. Buried scraper conveyor has a simple structure,light weight,small volume and good sealing. Also, it is easy to install or maintain. It not only can convey material in a horizontal angle,but also in a slant or vertical angle. What’s more, it can feed or discharge materials in many points. So its layout is very flexible. The working conditions can be changed markedly when it convey materials because the shell is enclosed.And then it can protect environment.

    We can solve the problem existed in medium plate which is made from steel through using ultra high molecular weight polyethylene. Thus, we can get plastic scraper conveyor. With regard to large-scale scraper conveyor, we can apply the method of steel-plastics compounding material. Using ultra high molecular weight polyethylene as lining, it can improve the abrasion resistance of large-scale scraper conveyor,and then prolong the service life, reduce the friction coefficient and bring down power consumption. It has great signific ance for large-scale scraper conveyor. Because of these features, buried scraper conveyor gets much attention of enterprises.

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Henan Pingyuan Mining Machinery Co., Ltd is the most professional manufacturer of Belt conveyor, and Vibrating screen, Bucket elevator, Screw conveyor, Scraper conveyor using the world's most advanced technology, we are willing to serve every company to meet your custom needs. Our goal is "be the future global leader of mining machinery industry". Have any questions, please contact us without any hesitation.

How to Design Buried Scraper Conveyor Scraper Chain to Minimize Trouble

 1. You should select the appropriate chain speed according to capacity and material properties, so that make the scraper chain run under reasonable load conditions. For the common material, scraper chainoperating speed range is generally 0.16 ~ 0.5m / s. You can choose a specific speed reference GB GB10596.1-89 standards and practical experience in the same industry units.

2. You should select the appropriate structure of scraper chain on the basis of delivery materials and transporting form. The selection principles are as following: in general, preferred forging chain, greater hardness of dust-like material should not be used bush roller chain, chain prone to floating material might as well use bush roller chain and double-plate chain. To ensure maximize the carrying capacity of scraper chain and avoid waste of energy and materials, you should be guaranteed under the condition that the scraper chain can bearing the maximum working load, choose the scraper chain closest to the required load and the maximum working load. 

3.  Select the chain of materials Scraper chain material must ensure a certain strength. In the long time work, insufficient rigidity will force the scraper chain produce plastically deformed scraper chain elongation, and chain in installation has been tensioned, allowed elongated room is little. This will make scraper conveyor bear a powerful additional load, which will inevitably bring damage to the chain. In other words, scraper chain stiffness shortage will make scraper chain obvious distortion in use. The ideal steel material is manufacturing performance not less than 45, scraper chain have to overcome a lot of friction, bearing a lot of dynamic load and static load, so after the scraper chain manufacturing and post-weld, it should be carried out heat treatment, make it has high strength, toughness and wear resistance characteristic.

 

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Henan Pingyuan Mining Machinery Co., Ltd is the most professional manufacturer of Belt conveyor, and Vibrating screen, Bucket elevator, Screw conveyor, Scraper conveyor using the world's most advanced technology, we are willing to serve every company to meet your custom needs. Our goal is "be the future global leader of mining machinery industry". Have any questions, please contact us without any hesitation.

Troubleshooting of Buried Scraper Conveyor

Trouble	Reasons	Troubleshooting
Deviation of chain scraper	1.     The whole equipment installed improperly; casing straightness is too large; wheel axle deflection; head, tail wheel misalignment. 2.      Casing transmutation 3.      Tail wheel inclines after adjusting the take-up unit	1.Checked the  installation quality 2.Adjusting the casing 3. Readjustment
Chain scraper break	1.     Chain wear 2.     The conveyor Overloading operation result in the strength is not enough. 3.     Some hard material fallen into the closed trough and locked the scraper	1.Change chain 2.Eliminate long time overloading operation 3. After manual discharging the machine should feeding uniformly
Chain scraper bent result in break	1.     Casing are not straight 2.     The location of flange is offset then locks the scraper.	1.Checked the  installation quality 2.Dismantled original installation and install it again
During the operation of chain scraper, it gives out excessive noise	1.     Some hard material fallen into the closed trough 2.     Some chain with looseness or Inflexible faults	1.Clear debris 2.Change chain
Head wheel not fit in with chain scraper well	1.     Head wheel chain inclines; Casing                 misalignment       2.     The chain is wearing out after long time               operation	1.Rectify head wheel shaft 2.Change chain

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Henan Pingyuan Mining Machinery Co., Ltd is the most professional manufacturer of Belt conveyor, and Vibrating screen, Bucket elevator, Screw conveyor, Scraper conveyor using the world's most advanced technology, we are willing to serve every company to meet your custom needs. Our goal is "be the future global leader of mining machinery industry". Have any questions, please contact us without any hesitation.