Incline Belt Conveyors
1. Incline belt conveyors are also made up from pre-engineered standard sections, but designed for permanent installation only. These standard sections are combined to make any length unit required.
2. Incline conveyors are normally equipped with NOSEOVER at the upper end. This enables the conveyed product to level off to a horizontal position before being discharged. This is highly desirable for cartons carrying breakables. The noseover eliminates a dropping action by the front of the carton when it reaches the top.
3. Incline conveyors can be used as independent units to move material from one level to another. When used with gravity conveyor, it provides continuous flow of material from one floor to another.
4. Because conveyor is used inclined, it is equipped with rough-top-belt.
5. Maximum recommended incline for is 25° degrees.
6. Material wider than belt can be moved on the conveyor adequately, if it has a flat solid bottom. The general rule is, carton should not exceed the overall width of conveyor.
7. Conveyed items on incline can be moved in two directions – both forward and back. Reversing applications require center drive.
8. Incline conveyors are available in steel ONLY. However, the portable ALUMINUM type may be used if lengths suffice and if NOSEOVER is not necessary.
9. Permanent supports are normally used for top and bottom of the conveyors when used as a floor-to-floor unit.
MAXIMUM INCLINES AND DECLINES: The maximum angle of incline or decline of a belt conveyor is function of:
1. Type of Belt being used.
2. The condition of the load. Some manufacturers claim that angles of 35 degrees to 45 degrees are possible. This is possible if all conditions are perfect and this seldom is the case.
FOR EXAMPLE: A wooden box with a flat rough bottom might negotiate a 25 degree angle; a smooth oily tote pan will probably slide at 15 degrees on that same belt. The weight of the load has little effect on the problem. The condition of the bottom and the center of gravity are the most important. For the uniform packed cartons, the center of gravity is close to the geometric center of the carton and can be located at the intersections of diagonal drawn between opposite corners. THIS IS NOT TRUE FOR NON-UNIFORMLY LOADED CARTONS SUCH AS TV SETS, COMPUTERS, ETC…
The center of gravity for this type of package can be determined by balancing the load on each of its four bottom edges to note the angle of stability in each direction.
We know that under “static conditions” a load is most stable. However, belt conveyors do not provide a static condition. They must start and stop fast and a load must be able to absorb forces such as momentum and acceleration without rocking beyond its stability point and tumbling.
A short load is more vulnerable to toppling than a long load.
Acceleration and deceleration of higher speed belts add to the problem more severely than do slower belts. Also, the use of magnetic brakes for stopping the conveyor will accentuate the problem associated with the tumbling due to deceleration.
The bottoms of most boxes are normally not flat, but slightly bulged. This creates some swaying even on level belts.
The spacing of the load supporting roller in a live roller conveyors and also belt conveyors, affect the amount of “bobbling” or “rocking” in transit. The closer the rollers are the smoother the travel. Slider bed conveyors provide the smoothest action of all.
For more information on Incline Conveyors please visit our website at Material Flow and Conveyors or give us a call at (800)338-1382