433A Conveyor Systems

Question 1

What is the function of a take-up system on a belt conveyor?

Accepted Answer

To maintain proper belt tension for adequate friction between the belt and drive pulley, and to remove belt slack

Answer

A take-up system maintains the correct belt tension required for the drive pulley to transmit force to the belt without slipping. It also removes slack that develops from belt stretch over time. Types include screw, gravity, and automatic hydraulic take-ups.

Question 2

What causes belt mistracking (belt running off to one side) on a conveyor?

Accepted Answer

Misaligned idlers, uneven loading, damaged belt edge, misaligned structure, or material buildup on pulleys

Answer

Belt mistracking is caused by any force imbalance across the belt width: misaligned idlers or pulleys, off-center material loading, uneven belt tension, material buildup on one side of a pulley, damaged or uneven belt edges, or structural misalignment.

Question 3

What is the purpose of a belt scraper (cleaner) on a conveyor?

Accepted Answer

To remove material adhering to the belt after discharge to prevent carryback, belt damage, and idler fouling

Answer

Belt scrapers remove residual material (carryback) clinging to the belt after the discharge point. Carryback that falls off under the return strand fouls idlers, builds up on pulleys causing mistracking, and creates housekeeping problems.

Question 4

What is a troughing idler on a belt conveyor?

Accepted Answer

A set of rollers arranged in a trough shape (typically three rollers at angles) to carry the loaded belt and contain the material

Answer

A troughing idler consists of three (or five) rollers arranged in a trough configuration — the center roller is horizontal and the wing rollers are angled upward (typically 20, 35, or 45 degrees). This shape increases the belt's material carrying capacity and prevents spillage.

Question 5

What is the function of an impact idler at the loading zone of a conveyor?

Accepted Answer

To absorb the impact energy of material falling onto the belt, protecting the belt from damage and reducing wear

Answer

Impact idlers have rubber disc or cushion rollers that absorb the impact energy when heavy or lumpy material falls onto the belt at the loading point. They protect the belt from impact damage, punctures, and premature wear.

Red Seal Millwright 433A Practice Test

Red Seal Millwright 433A Practice Test

433A Conveyor Systems