The head pulley is the primary driving component of a conveyor system, located at the discharge end where material is unloaded. It transfers rotational motion to the conveyor belt, typically powered by a motor or gearbox. Constructed from durable materials like steel with rubber or ceramic lagging, it ensures maximum grip and minimizes slippage. Key features include heavy-duty bearings for smooth operation, corrosion-resistant coatings for harsh environments, and customizable diameters to match belt speed and load requirements. Its design directly impacts conveyor efficiency, making it critical in industries like mining, logistics, and agriculture.
Technical Specifications
|
Parameter |
Specification |
|
Pulley Diameter |
Φ200 – Φ1800mm |
|
Applicable Belt Width |
500 – 2800mm |
|
Shaft Diameter |
Φ60 – Φ400mm |
|
Shell Thickness |
8 – 50mm (calculated based on tension) |
|
Lagging Type |
Herringbone rubber / Diamond rubber / Ceramic / Without lagging |
|
Lagging Thickness |
10 – 20mm (customizable) |
|
Radial Runout |
Head pulley ≤0.75mm |
|
Bearing Life |
≥50,000 hours |
|
Dynamic Balancing Accuracy |
Meets high-speed operation requirements |
|
Standards |
CEMA B105.1, DIN 22101, JIS B 8814, AS, ISO |
Product Features & Applications
The Head Pulley, a drive system core, employs double-row tapered roller bearings for 50% higher load capacity. Optional sensors monitor speed and temperature for predictive maintenance. Surface treatments like sandblasting, zinc plating, or Teflon coatings cater to diverse conditions.
In e-commerce logistics centers (belt speed 6m/s+), the system employs servo-driven head pulleys with ±0.1% speed accuracy and encoder-equipped tail pulleys monitoring real-time tension. CAN bus communication synchronizes acceleration/deceleration within 50ms. Result: JD.com's Shanghai fulfillment center achieved 98.5% parcel sorting accuracy at 15,000 pph throughput.
Product Advantages
Individually verified against maximum tension
Shell wall thickness, shaft diameter, and bearing configuration for each pulley are calculated based on maximum belt tension, drive power, and torque-avoiding reliance on generic drawings. This ensures the shell does not deform and the shaft does not suffer fatigue failure under heavy-load, long-distance operating conditions.
Full-penetration welding + ultrasonic testing
The shaft and hub utilize full-penetration continuous welding; critical welds undergo ultrasonic testing, and internal stresses are relieved prior to precision machining. Welds do not fail in high-stress zones, ensuring crack-free long-term operation at the drive end.
Lagging matched to operating conditions
Herringbone rubber is selected for unidirectional operation to facilitate water and mud drainage; diamond rubber is chosen for bidirectional operation to ensure uniform friction in both directions; ceramic lagging is used for highly abrasive conditions, offering superior wear resistance compared to rubber and reducing replacement frequency.
Customized to existing interfaces
Bearing center distance, mounting hole locations, shaft end configurations, and keyway dimensions are manufactured according to customer drawings or samples, allowing for direct on-site replacement without the need for foundation modifications.
Frequently Asked Questions (FAQ)
Q: What is the structural difference between the Head Pulley and tail pulley?
A: The Head Pulley is installed at the head of the conveyor and usually handles higher belt tension and driving force. Therefore, it generally has a larger shaft diameter and thicker shell, and rubber lagging is often used. The tail pulley mainly changes the running direction of the belt, so the load is relatively lower. It is usually designed with a smooth surface and a smaller shell and shaft.
Q: Can the pulley shell be repaired by welding after wear?
A: Minor local wear can be repaired by welding and then machining the surface again. Dynamic balancing should also be carried out after repair. If the wear exceeds 30% of the shell thickness or cracks are found, replacement is recommended instead of welding repair.
Q: What should be considered when using a Head Pulley on an inclined conveyor?
A: The belt force on the Head Pulley changes when the conveyor is inclined, so the bearing housing and anchor bolts should be checked according to the conveyor angle. If rubber lagging is used, make sure it provides enough friction to prevent the belt from slipping during operation.
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