What is the Requirement for Belt Conveyor Restart-up?

When the belt conveyor stops , restart-up belongs to overload start. Thus it requires belt conveyor equipped with a frequency converter in order to overload start. Here PK Machinery will summarize the requirement of belt conveyor restart-up.

Belt conveyor in the pick-up for overloading startup, motor output torque, which every support to overcome below the belt between the wheel and the roller shaft caused by static friction torque, also want to overcome the material on the belt tension caused by the downward drag torque.

coal belt conveyor

Materials on the belt tension caused by the downward drag torque is constant.But the static friction force is much larger than the dynamic friction, making it in order to overcome the initial startup of the static friction torque than the normal run-time dynamic friction torque caused by the much larger.

The inverter must have the function of the large starting torque at low speed.Actually in the process of starting, as a result of the belt scale, each wheel is time order one by one according to the rotation, will not rotate at the same time.Even if the wheel rolling, because of low speed between roller and roller shaft lubrication is not good, will be very acerbity, the dynamic friction is unstable, so low starting torque has the certain fluctuation.

fixed belt conveyor

So this kind of big starting torque at low speed is the need to maintain a certain period of time, usually at least a few seconds.The length of the belt and the minimum speed startup, and scalability of the belt.Because of the low speed, and startup torque and speed fluctuation will be big.
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How the Fixed Belt Conveyor Roller Classify?

Roller is used to support the conveyor belt and carry of the material, to ensure the stability of the conveyor belt.
In general, the fixed belt conveyor roller is the following:
1.Trough roller: it is also known as carrying roller which is used for carrying bulk material;
2.Parallel roller: parallel upper roller is used for carrying materials, parallel lower roller is to support the return branch of the conveyor belt;
3.Self-aligning roller: it includes taper aligning supporting roller and friction aligning roller which are mainly used for adjusting the belt deviation to avoid S-shaped, so as to ensure the stable operation of conveyor belt;
4.Impact roller: it is installed in the lower part of the conveyor belt, which can reduce the impact of the conveyor belt to extend the service life of the conveyor belt;
5.Return roller: it supports the conveyor belt of lower branch,including parallel type, V type, inverse V type,etc. V and inverse V type roller can reduce the conveying belt deviation possibilities;
6.Transition roller: it is installed between the drum and the first set of roller, which makes the conveying belt gradually turns from through shape into or flat shape and reduce additional stress of the conveying band edge turns to trough shape due to the expansion, at the same time,it can prevent the material spreading phenomenon of conveyor belt.
In addition, the comb type roller and screw roller, which can remove the sticky material on conveyor belt to keep the conveyor belt clean. 

Five Reasons Why You Need Pay Attention To 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.

conveyor 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.

conveyor pulley

The Daily, Weekly, Monthly Belt Conveyor Check

When using the belt conveyor, less daily check and maintenance or do not pay attention to maintenance will greatly reduce the service life of the belt conveyor, when the belt conveyor problems occur, it will affect the work efficiency, so regular inspection for belt conveyor parts is needed.
Daily check
Mechanical items: inspect the guardrail, bridge, roller, pulley, turnabout pulley and belt.
Electrical items: inspect the anti-skid device, deviation switch, emergency stop switch, tear detection device, anti-reverse device.

Weekly check
Mechanical items: inspect the driving wheel, guide wheel section, reducer, inspect the machine's tail, check tensioning device and pull rope device.
Electrical items: inspect the main motor, inverter, filter, repair and inspect the main transformer wiring, electrical control, power system.
Monthly check
Mechanical items: inspect the rope wheel, transition wheel, guide wheel, driving wheel, belt wheel, tensioning car and check the oiling.
Electrical items: inspect the fastening bolts, fast switch; the maintenance and repair of commutator, limit protection, emergency stop protection and the alarm system. 

 

Notice! Prohibit the following things during the operation of mobile belt conveyor

During the operation of mobile belt conveyor, if we operate it in the wrong way, it may lead to short service life, conveyor damage, even hurt the operator, please see the following things which are prohibited during the operation of the mobile belt conveyor:
1. Prohibit turning on the switch before making sure all nuts and bolts are tighten.
We usually disassemble the mobile belt conveyor during transport process. Customer needs to assemble it on site. If the nuts and bolts are loose, they may fall off during operating, thus, it will be a great potential safety hazard.
2. Prohibit changing the conveyor head direction before shutting down the switch.
Please shut down the switch first if when you want to change the conveyor head direction, or it will be easy to hurt the operator.
3. Prohibit moving the conveyor before shutting the switch
Mobile belt conveyor is a kind of light- weight conveyor, it can be moved anywhere, however, please shut down the switch first before moving it to ensure the safety of the operator.
4. Prohibit standing under the conveyor.
Please note, prohibit standing under the conveyor no matter operate the conveyor or not.

Safety Cautions of Fixed Belt Conveyor

Safety Cautions of Fixed Belt Conveyor

In the process of daily use,many users may use the wrong way to operate the belt conveyor.It will not only result in conveyor damage, but also harm to the operating personnel. Please pay attention to the following safety operating methods in order to utilize the fixed belt conveyor better.

Before the fixed belt conveyor put into use,uses should attention the following aspects.

1.Install the fixed belt conveyor according  to the prescribed installation methods

2.Check the running part of the belt buckles and bearing device is normal, whether the protective equipment is complete

3.The temperature of the working environment and delivery of materials shall not exceed 50 ℃ and lower than -10 ℃

Fixed Belt Conveyor

4.No pedestrians or take stand by the conveyor belt

5.Ensure the conveyor motor insulation is good

During the operation of belt conveyor,users can not ignore the following aspects.

1.No-load start the belt conveyor. Functioning rear can into the material.

2.When the conveyor is running the series, we should begin the discharge end, a sequence start. 

3.Be sure to stop into the material and then stop

4.Forbidden to pull the belt by hands,in order to avoid the accident

Sew Belt Conveyor Motor

Looking to Change Your Conveying and Screening Equipment?

Looking to Change Your Conveying and Screening Equipment?

In the process of operation,the conveying and screening equipment always cannot meet the needs of large materials supply.In order to improve the production efficiency and increase equipment capacity,conveyor and vibrating screen equipment will be used together with bin. Here our engineer will show you some useful tips for you purchase equipment.Hope this can be most help you.

Why we should use the bin together with the conveying and screening equipment?The reason is that the bin is an important connecting parts for the belt conveyor or vibrating screen.Silo is a common connection device,which has the advantages of store materials,reduce the impact to screen mesh when feeding material and increase the service life of the equipment.In the bottom of the bin to join electric flashboard valve or warehouse wall vibrator can better control of hopper feed speed, even feeding.

Adding silo or hopper above the conveying equipment or screening equipment can not only increase productivity, but also reduces the amount of labor intensity and operating personnel workers, thereby reducing the cost of the pipeline, save production costs.So don't change you conveying and screening equipment so fast.Maybe you can add a bin or hopper,then the problem will be solved.

bin-of-screw-conveyor-drawing 

PK Machinery has been exporting belt conveyor, bucket elevator, scraper conveyor, screw conveyor, vibrating screen and other spare parts for many years. We do believe business between our customers and us can develop fast. Any enquiry, please contact us!

Tel:+863735799198

Fax:+863735071699

E-mail:info@pkmachinery.com

Website:www.pkmachinery.com