8/8/2019 Conveyor Belt Sprocket Issues
First Aid for conveyor belt problems. Splice failure is most critical and needs immediate professional care. In case of damaged steel cords or even excessive movements of steel cord ends (see also 'Excessive elongation of belt'), the splice has to be cut out and removed. 7.2.6 Troubleshooting and Problem-Solving. If you find something wrong with a chain during start-up or regular inspection, it may require treatment as shown in Figure 7.19, or you may need to change to a different type of chain.
Updated September 26, 2017
The factory conveyor, which prepares rolls with poppy image by Motovilova from Fotolia.com
Updated September 26, 2017
âTrainingâ a conveyor belt means adjusting the pulleys, idlers and loading conditions of a particular belt in a way so that the belt will not become un-centered. Needless to say, with so many different parts and pieces to consider, it can be a complex and daunting process. Should you find yourself faced with the task of training a conveyor belt, a few general tips will make your work a little easier.
Before Running at Full Capacity
It is very important to make sure that a new conveyor installation is completely straight before running it at full production capacity. Test it before using it.
Working Direction
When adjusting a belt, start at the head pulley and work your way back. When you find a spot where the belt is coming off the track, start making adjustments about six idlers before that point.
Pulley Shaft Positions
Make sure that the head and tail pulley shafts are parallel to one another. You will find a snub pulley at each end of the belt. Adjusting this properly will ensure that the belt runs straight over the head and tail pulleys.
Running Off-Track
If you see the conveyor belt run completely off the track in one section of the belt, this is a good sign that there is a problem with an idler, pulley or other conveyor structure in that particular structure.
Idler Position
The belt idlers should always be bolted down perpendicular to the frame. If they are not perpendicular, then you will have problems.
Conveyor Movement
A conveyor belt will always move in the direction of whatever piece that it touches first. This means that an out-of-alignment idler could potentially de-train the entire belt.
Material Build-Up
Foreign material inside or around the conveyor will definitely disrupt the conveyor's operation. Material build-up around the conveyor's rollers is the biggest potential problem. One way to avoid these problems is to install a belt scraper so that it is constantly clearing off the belt's rollers.
Signs of Good Training
On a well-trained conveyor, the belt will make contact with all the horizontal roll the troughing idlers, and all the pulleys and idlers will be at right angle to the center line of the conveyor belt.
Test Run
Once you have finished a new conveyor installation, fully load the conveyor and let it run for several hours. At the end of this first day, leave the belt fully-loaded overnight. This will help to break in the belt faster.
The belt problem
The belt problem is a mathematics problem which requires finding the length of a crossed belt that connects two circular pulleys with radiusr1 and r2 whose centers are separated by a distance P. The solution of the belt problem requires trigonometry and the concepts of the bitangent line, the vertical angle, and congruent angles.
Solution[edit]
Clearly triangles ACO and ADO are congruentright angled triangles, as are triangles BEO and BFO. In addition, triangles ACO and BEO are similar. Therefore angles CAO, DAO, EBO and FBO are all equal. Denoting this angle by Ï{displaystyle varphi } (denominated in radians), the length of the belt is
This exploits the convenience of denominating angles in radians that the length of an arc = the radius à the measure of the angle facing the arc.
To find Ï{displaystyle varphi } we see from the similarity of triangles ACO and BEO that
For fixed P the length of the belt depends only on the sum of the radius values r1 + r2, and not on their individual values.
Pulley problem[edit]
The pulley problem
There are other types of problems similar to the belt problem. The pulley problem, as shown, is similar to the belt problem; however, the belt does not cross itself. In the pulley problem the length of the belt is
where r1 represents the radius of the larger pulley, r2 represents the radius of the smaller one, and:
Applications[edit]
The belt problem is used [1] in the design of aeroplanes, bicycle gearing, cars, and other items with pulleys or belts that cross each other. The pulley problem is also used in the design of conveyor belts found in airportluggage belts and automatedfactory lines.[2]
See also[edit]References[edit]
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