Special Attention on Scraper Conveyor Operation

Special Attention on Scraper Conveyor Operation

It’s better to learn the characteristics of conveying materials before scraper conveyor is put into use, especially cannot convey these materials which have large shape, density and water content. Different conveyor type has its certain capacity, the conveying efficiency can reach the highest value when casing is filled with material. Improper operation will influence the output when using scraper conveyor. So we must pay attention to the following notes.

Points for attention before start-up

1.Inspect whether the retaining ring in the middle trough is in good connection.

2.Inspect whether oil mass in all needed lubricating parts is enough.

3.Inspect whether all bolts in head and tail are fixed.

4.Inspect tightness of scraper chain.

5.Inspect whether all cables are in good condition.

6.Inspect whether the sound is normal when running machine.

7.Please run the machine after above mentioned notes are checked.

Points for attention during operation

1.Please check the cooling water, reducer gearbox and motor temperature at any time during operation.

2.Please observe whether reducer gearbox and other rotating parts have abnormal sound.

3.It’s better to idle several cycles before turning off machine so as to benefit next maintenance and start-up.

4.Must observe whether there is chain jumping situation during operation machine, once happens, please stop machine and maintain it right away.

Useful Ways to Scraper Conveyor Chain

Useful Ways to Maintain Scraper Conveyor Chain

It is well-known that scraper conveyor is widely application in cement, metallurgical and other industries. It’s pretty easy to mix with foreign objects during the conveying process which can lead to wear of the chain. Here PK Machinery will carefully illustrate methods to maintain scraper conveyor chain.

1.What should we do first is that to ensure all pins and pin screws are fixed before using scraper chain. Please make a regular check and keep maintenance records about the pins’ tension and their required torque.

2.Please check the scraper chain periodically so as to keep it running in a good situation. Once found that scraper chain is loose or there is abnormal sound caused by hitting guide rail rack, must please adjust chain tension timely.

3.Please ensure that connection between chains can move freely if change scraper chains.

4.Please check head part of scraper conveyor regularly to affirm whether it falls or not.

How to Operate and Maintain Buried Scraper Conveyor

How to Operate and Maintain Buried Scraper Conveyor

There are some options about that:

1.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.

2.It 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.

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.During operating, we should protect the conveyor from the iron, large hard objects and impurities to avoid damage the equipment.

5.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.

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.

I hope you can collect some useful information.

Engineering Guidelines for Scraper Conveyor

Engineering Guidelines for 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__℃.

Distinction Between Forging and Casting in Scraper Chain Processing

Distinction Between Forging and Casting in Scraper Chain Processing

It is a general machining process to use forging and casting in scraper chain processing. But do you know their differences? Today our PK Machinery will discuss this kind of knowledge detailedly.

With regard to forging, it makes use of a metal forming machinery to press on the metal blank so that let it get a certain mechanical properties, shape and size through plastic deformation.

With regard to casting, it is a kind of technology that makes metal to the required liquid and then pour into model. After having cooled and dealt, we can get casting with certain shape, size and performance.

Generally speaking, the performance of forging chain is superior to casting chain with the same materials, but the costs will be higher. Although the cost of casting chain will be lower, but it needs more materials and equipment as well as will generate dust, harmful gases and noise pollution. So we will choose forged chains as traction component mostly.

Reasons and Solving Measures for Chain Deviation in Scraper Conveyor I

Reasons and Solving Measures for Chain Deviation in Scraper Conveyor I

1. Influence of chain deviation

Scraper chain deviation will increase the gap between blade and base groove to reduce average speed of materials. Therefore, it is so hard to increase internal and external friction that the conveying efficiency will be reduced. If the gap is too small, it will increase the transport resistance, accelerate wear of blade and machine groove, reduce equipment lifespan.

2. Reasons for chain deviation

2.1 Poor installation quality leads to scraper chain deviation

1) The straightness of whole machine is out of tolerance.

2) Head and tail wheel are misalignment.

3) Scraper chain is out of shape which will lead to chain deviation.

4) Due to different tension adjusting, tail shaft will be deflection which can cause chain deviation.

Above mentioned points can cause chain deviation, then it will lead to unstable operation of the whole machine.

2.2 Material impact causes scraper chain deviation

Due to unstable discharging points, both sides of scraper conveyor have unbalanced stress, in this condition, it is easy to lead to chain deviation.

2.3 Uncertain reasons cause scraper chain deviation

Because of the complicated stress state, even if there is good installation quality, it will be easy to arise scraper chain deviation due to the greater frictional resistance.

Selection Principles for Scraper chain

Selection Principles for Scraper chain

Select the type of chain 

Chain should be carried out a reasonable selection according to the maximum working load as well as meet the requirements of material properties. 

1. It’s better not to select roller chain if conveying powder materials. In general, it’s better to adopt forging chains. 

2. Please try to reduce its weight on condition of meeting the chain strength’s needs. 

3. Different forms of arrangement have different chain selection. Usually, with regard to MS type, MC type and MG type, users have free to select any type of chain. 

Chain pitch selection 

Chain pitch should be chosen to minimize the maximum power load of chain withstand and shake amplitude as principle, because if chain jitter is too large, it will damage normal delivery state. If the chain with larger withstand dynamic loads will increase the weight of chain or reduce its service life. 

Blade pitch selection 

Blade spacing can be determined based on groove width, but it must adapt to the chain pitch. Generally, blade spacing is equal to chain pitch. If blade pitch is too large, it will increase energy consumption; if blade pitch is too small, it will increase the weight of traction and energy consumption.

Practices to Prolong Lifespan of Buried Scraper Conveyor

Practices to Prolong Lifespan of Buried Scraper Conveyor

1. Operators should carry out no-load commissioning after having started machine. It would be better to feed materials uniformly when the device operates normally. 

2. If there is no exceptional circumstance, users cannot turn off the power source to stop machine with load. 

3. If there are several scraper conveyors to combine a production line, please start machine from the last one, and then start up them one by one. 

4. Operators should check all components regularly, in particular scraper chain and drive units. 

5. During operation, please pay attention to if there are iron pieces, large pieces and other sundries mixing into conveyors, so as not to damage equipment or cause other accidents. 

6. Keep all bearings and drive section a good lubrication, but it should be noted that scraper chain, support rails and head pulley, tail pulley and other parts must not smear grease. 

7. In general, buried scraper conveyor should be a small maintained half a year, overhauled three years. Buried scraper conveyor overhaul should dismantle all parts to be cleaned or replace worn parts. Motor and reducer should be maintained according to the technical requirements of each product.