Ball mill with VFD control Mineral Grinding Equipment

Ball mill with VFD control

1.Product Introduction

A Ball Mill with VFD Control is a grinding machine equipped with a Variable Frequency Drive (VFD) system. By precisely regulating the frequency and voltage of the motor, it achieves stepless control over the cylinder’s rotation speed. This intelligent design significantly enhances grinding efficiency, energy savings, and operational stability, making it the preferred solution for upgrading traditional ball mills in modern mining, cement, and chemical industries.

2.Application

• Mining & Mineral Processing: Used for fine and ultra-fine grinding of iron, copper, and gold ores to optimize separation indicators.

• Cement Production: Grinds clinker, limestone, and coal slag, serving as core equipment in cement production lines.

• Chemicals & Pharmaceuticals: Grinds chemicals, pigments, and medicinal raw materials to ensure uniform particle size and avoid cross-contamination.

• Construction Materials: Processes silicates, gypsum, and ceramic raw materials to meet high-precision powder requirements.

• Research & Pilot Plants: Utilized in laboratory or pilot-scale 2-ton ball mills for new material R&D and process optimization.

3.Working Principle

• Material Input: Materials are fed uniformly into the horizontally rotating cylinder via a feeding device.

• Grinding Process: The cylinder contains grinding media, such as steel balls. The motor drives the cylinder through a reducer; centrifugal and frictional forces lift the balls to a certain height before they fall, creating an impact and attrition effect on the material.

• Classification & Discharge: Ground material is discharged via a grid plate or overflow. Fine powder enters the subsequent classification system (such as an air classifier), while coarse particles return for further grinding.

• VFD Control Core: The frequency converter adjusts the motor speed in real-time (typically 15–30 RPM), enabling soft starts, precise speed regulation, and load adaptation. This prevents overloading and "mill choking" while optimizing grinding trajectories and energy utilization.

4.Advantages 

• Significant Energy Savings: The VFD can reduce starting current by over 50% and operating current by 20–30%, leading to an overall electricity saving rate of 15–40%.
• Stable Operation: Soft starts minimize mechanical impact, extending the lifespan of gears and bearings. It prevents "bearing burn" shutdowns and increases equipment uptime.
• Intelligent Control: Supports PID closed-loop control, remote monitoring, and automated integration, enabling unmanned operation and precise replication of process parameters.
• Increased Productivity: By optimizing rotation speed and filling rates, output can be increased by 5–7%, with the ability to dynamically adjust to different material hardness levels.
• Simple Maintenance: The use of rolling bearings and glycerin lubrication systems reduces oil contamination and lowers maintenance frequency and costs.
• Eco-Friendly & Low Noise: Reduces unplanned downtime caused by overloads, decreases energy consumption and carbon emissions, and aligns with green manufacturing trends.

5.Technical Specifications

6.Our Solutions