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.

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.

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.