Bucket Elevator Holdback Problems during Operation

Bucket Elevator Holdback Problems during Operation

This article mainly tells us that when using bucket elevator, why sometimes there is abnormal holdback problems operation phenomenon during operation.

While using bucket elevator, sometimes there is abnormal holdback operation phenomenon during operation, do you know the reason?

In fact, during the operation of bucket elevator, sometimes there will be operation stopping inevitably due to malfunction or heavy-loading, even the breakage of link chain or belt could occur, then cause reversal. The reverse operating can cause collision of the bucket and material that remain in the bottom, this could easily cause deformation of bucket and will not function well due to severe damage. Overloading situation is easy to occur if not pay attention to feeding capacity.

Under normal circumstances, the bucket of bucket elevator will lift the material from the bottom to the discharge port which is located on top of bucket elevator and then throw out. In order to ensure the production, when designing and manufacturing equipment, manufacturers just consider that the equipment will not reverse under the non-load condition, because bucket of lower part is two more than upper part, which will be much heavier than the upper. In order to prevent the breakage of belt or link chain or reversal occur in the bucket and link chain, especially when the bucket elevator is under the overload condition, the backstop should be installed at the external of bucket elevator in order to avoid the problem of overload.

 

The bucket elevator holdback consists of reverse rod, revolving shaft, retracting spring and dowel pin etc. In the process of normal operation of bucket elevator, the reverse rod will be upswing after hit by the sleeve, it will fall under the action of retracting spring force, then upswing after hit by another sleeve, not affecting the normal operation of equipment. If there is reversal of bucket elevator, the dowel pin will halt the reverse rod, so it will no longer swing down, and the sleeve will also be blocked by the reverse rod, hence the whole link chain could not reverse. If there is too much material spilled inside the body of machine and fall on the reverse rod, it will cause the failure of holdback.

If there is too much materials outside the bucket elevator, it will affect the rotation axis of screw. We may see there will be stacked with material in the pit of bucket elevator on the user’s site, which will seriously affect the operation of the relevant parts of holdback.

4 Methods to Solve Uneven Rotating Speed of Bucket Elevator Problem

4 Methods to Solve Uneven Rotating Speed of Bucket Elevator Problem

If rotating speed of bucket elevator is uneven, it will affect the efficiency of bucket elevator capacity. So here we will introduce 4 methods to address this kind of problems and hope that can help you.

1. Base frame blockage

The reason is feeding prior to start-up, the bucket belt lacks of tension which will cause belt skid, or the inflow rate of feeding is greater than the conveying capacity (including excessive of feeding back), as well as bulk materials enter into the base frame. The methods to eliminate the problem is to shut down the machine at once, close the feeding chute, open the base frame gate plate , clear the clogged material, and start up the machine in accordance with procedures. And also adjust the tension device in order to strengthen the clean up speed of anterior materials.

2. Conveying capacity reduces

The reason is due to the skid of the drive belt or lifting belt, insufficient rotating speed of electrical motor, uneven feeding, serious feeding back, unreasonable selection of bucket design. The methods to eliminate the problem is to adjust the tension device, check electrical motor, eliminate the fault, feed evenly, identify the cause for promptly discharge of material, and select bucket design reasonably.

3. Excessive of material returning back

The reason is the linear speed of belt elevator too fast or too slow, improper design or size of drive head, material discharging in the outlet is not smooth. The methods to eliminate the problem is to adjust the rotating speed of bearing, modify the external dimensions of drive head or adjust the drip plate at the bucket gap, and unblock the outlet.

4. Casing wears seriously and large power consumption

The reason is the installation of bearing tilts, dust deposition on bearing, poor lubrication, bearing failure or elevator belt is too tight, excessive of material returning back, blockage of base frame. The methods to eliminate the problem is to readjust, clean or change the lubricating oil, replace the bearing and adjust it properly. Identify the cause for promptly discharge of material, and clear the clogged materials.

Troubleshooting of Abnormal Noise during the Operation of Bucket Elevator

Troubleshooting of Abnormal Noise during the Operation of Bucket Elevator

When operating bucket elevator, do you know how to trouble shoot if there is abnormal noise? Here, PK Machinery will analysis it and hope it can help you.

1. The base plate and chain bucket of bucket elevator collide with each other: adjust the take-up device of base in order to stretch the chain.

2. The driving shaft and driven shaft key is flabby, the sprocket is drift, chain bucket collides with casing: the position of sprocket needs to be adjusted and the key needs to be stretched.

3. The guide plate collides with chain bucket: readjust the position of guide plate.

 

4. There are some materials mingled in the guide plate and chain bucket: enlarge the inputs angle of material inside the base.

5. The failure bearing causes inflexible operation of bucket elevator: the bearing need to be replaced.

6. The pieces of materials or other objects stuck in the casing: stop the operation of bucket elevator and remove the materials. 

7. Gear profile of sprocket (driving and driven sprocket) is abnormal: correct the gear profile of sprocket or replaced driving sprocket. 

8. Gear profile of driving sprocket and chain is out of order: the sprocket gear profile needs to be corrected. 

9. Drive chain idling: adjust the length of chain.

10. The casing is not installed properly: the full length of vertical alignment of casing needs to be adjusted.

 

Five Phenomenon will Lead to Bucket Elevator Dust Explosion

Five Phenomenon will Lead to Bucket Elevator Dust Explosion

Do you know which five phenomenon will lead to bucket elevator dust explosion? Today, PK Machinery will analysis the damage and main reasons of it. Hope it can help you.

Bucket elevator is widely applied in industrial and agricultural production. In the process of loading materials, the buckets of bucket elevator will strike on the material at a higher speed, which causes a great friction and impulsive force on materials, and will result friction between materials. Hence, the dust material dust will be blown out. When unloading the materials, materials will be thrown from the bucket, which also cause the dust blowing out. 

In order to control the dust leakage, bucket elevator works under the condition of completely sealed, the enclosed space virtually increased the risk of explosion. Although the bucket elevator is worked in a sealed condition, the casing is not very tight, the air can enter through the connector and inlet port. Therefore, there is presence of large amounts of oxygen in the internal. When there is a fire, it can generate dust explosions. Bucket elevator can create dust explosion may be due to undesirable of machine operation, where there is high possibility of creating a spark. The main reason is as follows:

(1) if particle flow contains metallic impurities, it may collide and rub with the bucket in the process of the flowing, this will create spark.

(2) if belt deviation occurs and rubs with casing, it may produce spark, so in order to prevent the sparks, it is better to use the chain bucket elevator.

(3) when buckets or screw fall off, it can produces sparks when rub with other components.

(4) when bearing overheats or belt skid for a long period, it can achieve ignition point of dust explosion.

(5) the open flames enters, igniting dust explosion etc.

 

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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.