Overflow ball mill

Product Introduction

The overflow ball mill is a type of ball mill and is currently the most commonly used mill in mineral processing plants. The DMG overflow ball mill is suitable for materials such as slag, calcite, marble, dolomite, limestone, and quartz. It primarily consists of a cylinder, end caps, main bearings, hollow shaft necks, transmission gears, and a feeder. The overflow ball mill is a horizontal, cylindrical rotating device with an external gear drive, a two-chamber, grate-type ball mill. The material is fed from the feeder through a hollow feed shaft and spirally and evenly fed into the first chamber of the mill. This chamber has stepped or corrugated liners and is filled with steel balls of varying sizes. The rotation of the cylinder generates centrifugal force, which carries the balls to a certain height before dropping them, impacting and grinding the material.

Product Advantages

1. Overflow-type ball mill with staged starting, reducing installed power

Using an air clutch or liquid soft starter, the ball mill's main motor and drum are started in stages, reducing installed power and starting current from 6.5 times that of direct starting to 2.5 times.

Drive Types: Single synchronous motor drive, single asynchronous motor drive, dual synchronous motor drive, dual asynchronous motor drive, and gearless ring motor drive.

2. Dynamic and static pressure or fully static pressure bearings effectively prevent bearing burnout

Using dynamic and static pressure or fully static pressure bearings:

Dynamic and static pressure bearings: Use a combination of high- and low-pressure oil stations for lubrication. High-pressure oil is used during startup and shutdown to lift the rotating part, while low-pressure oil is used during normal operation.

Fully static pressure bearings: High-pressure oil is used to lift the rotating part during the entire mill operation. Both types of bearings effectively prevent bearing burnout and extend bearing life.

3. Advanced Technology and High-Quality Materials

The mill structure is optimized, with various structural designs tailored to the material characteristics and grinding requirements. Multiple patents have been filed. New processing techniques simplify the process flow. For example, the cylinder, end cap, and large gear flange are machined without touching each other, shortening the manufacturing cycle. Bearing types include single-wafer babbitt alloy, single-wafer high-lead bronze, and sliding shoe bearings (babbitt alloy). New wear-resistant materials are used for liners, inlet and outlet bushings, and bearings to extend the life of vulnerable parts.

4. High Automation and Easy Maintenance

The mill's automation level is enhanced with PLC control, featuring audible and visual alarms, fault diagnosis, and integrated electromechanical and hydraulic control. Auxiliary equipment includes a micro-tow device and a lifting device.

5. Excellent Wear Resistance

The overflow ball mill's cylinder is lined with wear-resistant materials, enhancing wear resistance and extending service life. Both drum feeders and combined feeders are available to meet diverse user requirements.

6. Fine Finished Product

Overflow ball mills have a simple structure and are easy to maintain. The reverse-threaded discharge pipe prevents large ore and steel balls from being discharged. The fine product is often used for fine grinding, i.e., grinding fineness less than 0.2mm, or in the second stage of a two-stage continuous grinding process.

7. Easy Installation

Overflow ball mills use rolling bearings instead of plain bearings, saving 10%-20% energy. Furthermore, they feature an integrated platen, shortening installation time and reducing installation requirements.

8. Diverse Lubrication Methods

Specifications

1. Technical Parameters of Selected Overflow Ball Mills