Minimum run out of idler rollers for belt conveyor

Most of the drivers understand that proper wheel alignment for your vehicle is paramount to your safety and extends the life of your tires, provides better mileage and gives more comfortable ride. Similarly, proper alignment of the “scale area” is paramount to satisfactory operation of a belt conveyor scale. Most scale manufacturers have established strict guidelines for installing and aligning belt conveyor scales. Failure to follow these guidelines may result in less than favorable scale accuracies and repeatability.

The idler alignment must be completed prior to placing a belt conveyor scale into operation. This alignment includes idler spacing, centering the idlers on the conveyor frame and adjusting the idler backing height. All of these dimensions must be held to a maximum tolerance of 0.030. The height and centering dimensions of alignment are verified by use of several “string lines”. It is recommended that a minimum of five string lines be used and on wide conveyors (≥42”) as many as 7 string lines be used. These lines will ensure that the idlers are level with one another, aligned on the same conveyor centerline and that the wing roll angles match within ± 1o.

It is recommend the usage of idler specially manufactured for use with a belt conveyor scale. These idlers are known as scale duty or scale quality ensure. The minimum Total Indicated Runout (T.I.R) tolerance is 0.015” and that the idler trough angle is within ± 1o. T.I.R is a measurement of the variance of a cylindrical item as it is rotated. Here’s a sketch to illustrate the measurement using a dial indicator.

Some manufacturers build a scale quality idler that has an adjustable plate built into the end stand to enable fine alignment of the trough angle during installation. The use of existing idlers (non-scale quality) is not prohibited, it may result in additional time being required for the alignment. In extreme circumstances, it may be necessary to modify the trough angle to meet the 1 degree tolerance, as well as adding bracing to the cross member and adding gusset supports to the end stands.

These “extreme” measures of idler modification may seem time-consuming and costly, but they will aid in long-term accuracies from the belt conveyor scale system.

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Henan Pingyuan Mining Machinery Co., Ltd is the most professional manufacturer of Belt conveyor, andVibrating 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.

Problems and solutions in the operation of belt conveyor

1) The motor too heat 

Reason: Due to overloading or conveyor belt was stucked, the running resistance increases, motor overload operation, lubrication conditions of driveline is poor, also can led to the increase power of motor. 

The solution: Relubrication the transmission parts timely

Reason: Accumulation of coal dust in the inlet of the motor fan or radial gasket, make the cooling conditions deteriorate.

The solution: Clean the coal dust. 

2) The problem of belt broken.

Reason: The material of the belt body is not fit,becomes hard and brittle when come across cold or water. 

The Solution: use the material stable in mechanical and physical properties to produce the core.

Reason: The strength of the conveyor deteriorates due to long-term use.

Solution: replacement the damaged or aging conveyor belt timely, observed the joint regularly find problems in time. 

3) the axis of the roller and belt conveyor centerline are not vertical. 

Reason: Roller axis is not perpendicular to the centerline of Belt conveyor in installation caused the conveyor belt deviation

Solution: Adjust the roller that run laterality to the the direction of the conveyor belt running .

4) The rotation of the idlers is not flexible or can not run.

Reason: Bad in seal and dirt into the bearing causing the rotation of the idlers is not flexible or can not run. 

Solution: replacement of the roller that does not rotate immediately.

Reason: There are dung on the rolls. 

The solution: removal the dung on the rolls timely .

5) Slipping of the belt.

Reason: The tensioning force of the conveyor belt is shortage cause the belt slip. 

The solution: re-adjust the tension, reduce the traffic. Reason: The coefficient of friction between the roller and the conveyor belt reduces because of watering. 

The Solution: eliminate watering, increasing the tension, use the drum with pattern rubber surface

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Henan Pingyuan Mining Machinery Co., Ltd is the most professional manufacturer of Belt conveyor, andVibrating 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.

Features of cwith Large Dip Angle

Sidewall belt conveyor with large dip angle is made by sidewall belt with diaphragm plate, and it is especially suitable for continuous transporting bulk materials in large dip angle, and widely used in coal, chemical industry, electric power, building materials, metallurgy, food, port, shipbuilding and other industries.The main characteristics of sidewall conveyor are as following.

  (1) Big inclination conveying, saving the cover area of equipment, reaching the transport angle the ordinary, decorative belt conveyor cannot reach. 

  (2) Low cost, and can save 20% ~ 30% investment compared with the general belt conveyor can .

  (3) Technical performance is superior compared with general belt conveyor, bucket elevator, scraper conveyor.

  (4) The hoisting height is large, single vertical hoisting height is 500 m.

  (5) Advanced technology, simple structure, smooth operation, safe and reliable to use, less equipment parts, less maintenance, low noise, flexible layout, and many other advantages. Sidewall belt conveyor with large dip angle is suitable for the working temperature of 15 ~ 40e, conveying various bulk materials in density of 0.15 ~ 319 t/m3.

  (6) Can be layout in the angle of 0 ~ 90b. In the vertical conveying, also can rotate around 180b, and reach the feeding and discharging within the scope of 360b.

  (7) Due to the big inclination conveying, when reach the same transport height, the length is shorten, so is the length of propylaea, which reduces the investment in equipment and engineering cost and the area.

  (8) Large dip angle and short length. Compared with ordinary belt conveyor, sidewall belt conveyor with large dip angle can reduce the number of roller, conveyor belt length and material weight, which greatly reduce the resistance of roller and consume power of  conveyor belt and material. Therefore, the machine can reduce energy consumption.

  (9) When the machine in the vertical layout, general is fully enclosed, good sealed, little dust and environmental protection effect is remarkable.

  (10) The lateral stiffness of the conveyor is stronger, the base band both have vertical roll running deviation, and the materials are to be delivered at the center of the conveyor. Therefore, the conveyor belt can run without running deviation.

Troubleshooting of Mining Belt Conveyor

  As the development of the conveying technology, belt conveyor used for mining industry also changed rapidly, adding many new functions. These new functions provided convenience for the user's operation and maintenance. Mining industry are mostly make multiple machineries work together to complete the handing task. If improper operation or material blocking caused the conveyor stop working, the motor will prone to be overloading and making abnormal sound. At this time we should shut down the conveyor immediately and examine the conveyor to find out the failure reason.

   Because mining industry has more complex situation the machinery will be prone to cause problem, if we can’t find out the problem promptly then will bring a greater loss, so Mining Belt Conveyor should be installed a sensor in the right place. When a trouble happens on Mining Belt Conveyor, such as motor burning, transmission part damaged, belt or chain fracture, belt slipping,

 

 
  we should design and installed some sensor or control switch with the shut down and control function, so that when trouble happens the sensor switch will give out the signal of shut down the conveyor automatically and also give out alarm. It not only reduces the damage caused by the trouble but also find out the trouble part promptly save the maintenance man lots of time.

    Here we want to emphasis the take-up device of the belt conveyor. It is well known to us that the operation of the belt conveyor should maintain proper tension, if the belt become sag and can’t meet the required tension, the belt will be prone to slipping on the transmission pulley. Providing that we can’t adjust the belt promptly, it not only affects the conveying efficiency but shorten the useful life of the belt. The take-up device of the belt is designed to make the belt up to the required tension to avoid belt slipping on the drive pulley and guarantee the deflection between idlers in the specified range. The new belt and the belt using after a certain time is different in the length and tension, so we should adjust the take-up device promptly.

       Mining Belt Conveyor is mostly work with multiple machineries, so the control and operation of the machinery are usually adopt intelligent controlling and remote monitoring technologies. Thus, when the trouble happens on the machinery, the automatic alarm device on the conveyor will give out signal to the operator promptly, then the operator can use the feedback information to find the trouble part directly and begin repair the trouble part. It not only saving the operator’s time of finding the trouble but also minimize the damage of the users caused by the conveyor shut down. 

Reasons of Drifting of Belt Conveyor

 As one of the most common conveyors, belt conveyor is widely used in metallurgy, chemical, electricity, coal, mining, port, transportation and so on. In operation of belt conveyor, there is much drifting of the machine. The following is reasons of the phenomenon.

1. There is coal or other attachments in the surface of pulley or idler.

2. There is mistake in the degree of net post manufacture of driving pulley and bend pulley.

3. Driving pulley and bend pulley are not parallel.

4. Diameters of driving pulley and bend pulley are inconsistent.

5. Center line of driving pulley and bend pulley is not vertical with center line of machine body.

6. Feeding position is inappropriate.

7. Center of pulley is not in the center line of the machine.

8. Installation of idler is inappropriate.

9. Stiffness of frame is bad which causes the deformation of the machine.

10. Joint of belt conveyor is inappropriate or the belt conveyor is aging and deterioration.

11. Rotation of unilateral bearing is not flexible.

12. The damage of ware of the two side of driving pulley are inconsistent.

13. The adjusting device is damaged.

14. Girdle pulley in head and bend pulley are not parallel.

15. Center lines in both sides of belt conveyor are not consistent, or the margin of belt is heavily damaged.

16. Installation of feeder, unloader and sweeper is inappropriate.

17. Degrees of ware of two sides of coal unloading pulley are inconsistent.

18. Take-up tension of belt conveyor is not enough.

19. Feeding direction and height arrangement are inappropriate.

20. Support of idler is heavily damaged.

Site Application of Trommel Screen and Inclined Belt Conveyors

Trommel screen and inclined belt conveyors is widely used in conveying and screening industry.They are specifically for processing bulk materials such as coal, construction material, stone, sand, compost, woodchip, soil and related products. .
In real manufacturing process, trommel screen and inclined belt conveyors are the most important parts in the production line. At the same time , it is in response to customer demand for handling larger volumes. Also, as modern production system, it can not only save energy and optimize throughput requirements, but also improve the efficiency of production and provide suitable solutions across a wide range of sectors for our customers. It is also another option to our customers to save more costs.

We have been in manufacturing belt conveyor, vibrating screen, bucket elevator, screw conveyor, scraper conveyor for many years. With the development of our company, we will manufacture higher quality products to meet our customers’ requirements better.

For more information, pls do not hesitate to contact us via : 

Web:http:www.pkmachinery.com

Mobilephoe:+86 18338953783

Tel: +86 373 579 9198

Fax: +86 373 507 1699

Address: 289 Yellow River Road, Xinxiang City, Henan Province, China

Introduction of Three Types of Belt Conveyor Cleanser

1.P type alloy rubber cleanser
It is installed in the place of head pulley, the installation position of P type alloy rubber cleanser is similar to the spring cleanser, compared with the spring cleanser, it is mainly with the help of rubber elasticity, at the same time the hard alloy scraper cleanser presses close to conveyor belt surface after material separates from the conveyor belt, cleaning the material which is stuck on the conveyor belt.

2. H type alloy rubber cleanser 
It is installed in the place of head pulley and close to the conveyor belt, the cleaning principle of H type alloy rubber cleanser and P type alloy rubber cleanser is the same.

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3.hard alloy scraper cleanser 
Hard alloy scraper cleanser is installed in the place of head pulley, the material of scraper is hard alloy, it has two types: single piece and double piece. You can adjust the counter weight to change scraper stress to conveyor beltto achieve the effect of cleaning materials.

For more information, pls do not hesitate to contact us via : 

Web:http:www.pkmachinery.com

Mobilephoe:+86 18338953783

Tel: +86 373 579 9198

Fax: +86 373 507 1699

Address: 289 Yellow River Road, Xinxiang City, Henan Province, China