Troughing Idler

Troughing idler also known as carrying idler and top idler, as per order requirement we are manufacturing BRB-26-1 type troughing idler.

A troughing idler is a type of conveyor idler that supports the loaded side of the belt, causing it to form a “trough” shape. This shape helps contain bulk materials and increases the belt’s carrying capacity. The technical specifications of a troughing idler are defined by its physical dimensions, load rating, and the materials used for construction.

Key Technical Specifications

• CEMA Class Rating: The most important specification is the CEMA (Conveyor Equipment Manufacturers Association) This rating system (A, B, C, D, E, F) defines the idler’s load-carrying capacity based on factors like belt speed, belt width, and material weight. A higher CEMA class indicates a more robust idler designed for heavier loads and more demanding applications.
• Troughing Angle: This refers to the angle of the two outer rolls relative to the horizontal center roll. Common angles are 20°, 35°, and 45°. A deeper troughing angle (e.g., 45°) provides greater capacity and helps prevent spillage, especially with fine, loose materials.
• Belt Width: The idler set is designed for a specific conveyor belt width. The length of the center and wing rolls and the overall frame width are sized to provide full and consistent support for the belt.
• Roll Diameter: The diameter of the individual rollers in the set. Common diameters range from 4 to 8 inches (102mm to 203mm). The correct diameter is chosen based on the belt speed and load to ensure the bearings have a long service life.
• Materials and Construction:
  • Rolls: The rolls are typically made from a steel tube, with the thickness of the shell specified to handle the load and prevent deflection.
  • Frame: The frame is the welded or bolted structure that holds the rolls. It is generally made from steel channel or angle iron, with a specific gauge and finish to ensure rigidity and corrosion resistance.
• Bearings and Seals: The idler’s lifespan is highly dependent on its bearings and sealing system.
  • Bearings: Troughing idlers use deep-groove ball bearings, which are selected for their ability to handle both radial and thrust loads.
  • Seals: A labyrinth seal is commonly used. This multi-stage sealing system is designed to prevent contaminants like dust and moisture from reaching the bearings, which is crucial for operating in dusty and harsh environments.