Bottom roller
The bottom roller is a supporting component installed in the return section (the unloaded part below the belt) of a belt conveyor. Its main function is to support the weight of the belt and maintain its stable operation, preventing the belt from sagging, running off track, or accumulating material. Based on structure, it can be divided into types such as parallel bottom rollers, V-shaped bottom rollers, and inverted V-shaped rollers.
- Product Description
-
Product Introduction and Advantages
The bottom idler roller is a supporting component installed on the return section (the unloaded part below the belt) of a belt conveyor. Its main function is to support the weight of the belt and maintain its stable operation, preventing the belt from sagging, deviating, or accumulating material. Based on its structure, it can be classified into parallel bottom idler rollers, V-shaped bottom idler rollers, and inverted V-shaped idler rollers, etc.
1. Structural Features
Material:
Roller Body: Seamless steel pipe (wall thickness 2.5~6mm), wear-resistant composite material (such as ultra-high molecular weight polyethylene).
Bearing: Double-sealed deep groove ball bearing (dustproof and waterproof, IP65 protection level).
Shaft: 45# steel, quenched and tempered, or 40Cr alloy steel, chrome-plated surface for rust prevention.
Surface Treatment: Galvanized, electrostatic spraying (corrosion-resistant), rubber coating (noise reduction/anti-stick).
Installation Method: Fixed type, spring buffer type (for long-distance conveyors).
2. Main Types and ApplicationsType
Structure
Application Scenarios
Parallel Bottom Idler Roller
Single straight roller
General purpose, suitable for most return section supports
V-shaped Bottom Idler Roller
Two rollers arranged in a 15°~30° V-shape
Prevents belt deviation, suitable for high-speed/long-distance conveying
Inverted V-shaped Idler Roller
Two rollers arranged in an inverted V-shape
Cleans residual materials adhering to the back of the belt
Comb-type Idler Roller
Surface with spiral grooves or ridges
Self-cleaning function, prevents debris accumulation
Product Advantages
1. High-efficiency and Stable Operation
V-shaped design: Automatic centering function, reduces the probability of belt deviation (deviation correction effect improved by more than 50%).
Low-resistance bearings: Rotational resistance ≤0.8N, reduces power consumption in the return section (energy saving 5%~10%).
2. Extended Belt Lifespan
Uniform stress: Precision-machined rollers ensure that the belt has no local stress concentration, avoiding longitudinal tearing.
Anti-stick design: Rubber-coated or composite material rollers prevent wet and sticky materials from adhering to the back of the belt.
3. Strong Environmental Adaptability
Corrosion resistance: Galvanized/stainless steel material is resistant to acids, alkalis, and salt spray, suitable for humid environments such as chemical plants and ports.
Wear resistance: Thickened steel pipes or ceramic-coated rollers are suitable for high-wear conditions in mines.
4. Convenient Maintenance
Quick-release structure: Snap ring or pin design, replacing a single roller takes only 5~10 minutes (traditional welding type takes more than 1 hour).
Self-cleaning function: Comb-type or inverted V-type idler rollers can automatically remove debris from the back of the belt, reducing the frequency of manual cleaning.
5. Economy
Long lifespan: High-quality bearings + sealing design, service life can reach 30,000~50,000 hours (ordinary idler rollers are about 10,000~20,000 hours).
Modular replacement: Only damaged parts need to be replaced, reducing overall maintenance costs.
Comparison and Improvement over Traditional Bottom Idler RollersComparison Item
Modern Bottom Idler Roller
Traditional Bottom Idler Roller
Deviation Correction Ability
V-shaped/Inverted V-shaped automatic deviation correction
Requires additional deviation correction device
Sealing Performance
Triple labyrinth seal, waterproof and dustproof
Single layer rubber seal, prone to failure
Load Capacity
Dynamic load can reach 500kg/roller
Usually ≤300kg/roller
Noise Control
Rubber-coated roller body, noise ≤65dB
Steel roller noise ≥75dB
Selection Guide
1. Select according to belt width:
Belt width ≤1000mm → Parallel or V-shaped idler roller (roller length = belt width + 50mm).
Belt width ≥1500mm → Reinforced V-shaped idler roller (with intermediate support frame).
2. Select according to environment:
Dusty environment → Fully sealed bearings + self-cleaning roller body.
Low temperature environment (-30℃ and below) → Cold-resistant nylon bearing housing.
3. Special requirements:
Anti-static → Carbon fiber composite roller body.
Food grade → Stainless steel + FDA certified silicone coating.
Typical Industry Applications
Mining: Thickened steel pipe V-shaped rollers, impact-resistant and anti-deviation.
Thermal power generation: High-temperature ceramic coated rollers, suitable for high-temperature slag transportation.
Grain storage: Stainless steel comb-type rollers, preventing grain residue.
For specific parameters (such as shaft diameter, load, speed) or customized solutions for working conditions, please provide the conveyor model and operating environment for further optimization!
Keywords:
Related Products
Get a Quote
Address: 50 meters north of the intersection of Dongwaihuan Road and Zhengxilu Road, east side, Zaqiang County, Hengshui City, Hebei Province
Telephone:18103389929
Email:wopan@hbwpzg.cn
Mobile Website