More Information Travel Speed / Slow Convey/ Poor Screening Troubleshooting
Low operating stroke results in slower conveyance rates. In some cases, low stroke can also cause screening issues. When operating at lower stroke values, material on the conveying surface is not lofted as high, or as far forward. If the stroke is too low, finer particles may not be settled to the bottom of the burden depth for proper screening. In some cases, the near size pieces may not be ejected from the openings resulting in screen plugging.
VIBRA-SNAP® Screens and direct drive (brute force) screens require the weights to spin in the direction marked on the machine and in the General Arrangement drawing. If the motor rotation is incorrect, it can cause very slow travel speed and poor screening efficiency due to material being lofted slightly against the flow. Proper drive rotation is indicated on general arrangement drawing. To reverse motor rotation, swap any two of the phase wires where they connect to the motor input in the motor junction box.
Rigid deck screens on vibratory equipment can become clogged with “near” sized particles or if the material is especially sticky. Material that is not passed through the screen increases the burden depth of material above the screen. The material stuck in the screen can cause restriction and reduce the travel speed of the bulk flow above. If the screen becomes clogged it should be cleaned. Infeed surges can reduce travel speed. Underloaded and overloaded conveyors may have slower travel speed. If a material does not spread out on the conveyor naturally a surge and starve feed rate can slow overall throughput. Reducing surge in material delivery is accomplished differently depending on the material and application, contact ACTION for advice. Material buildup at discharge slows down upstream material. Downstream equipment shutdowns, material sticking to chute work or transitions can cause buildup. If buildup is present, it should be removed. A change in configuration or shutdown procedure may be required.
