Papua New Guinea CL-Large Flour Mill

The CL large-scale pulverizer is a new type of mill developed by our company, incorporating advanced structural technologies from overseas grinding equipment.
The CL large-scale pulverizer consists of a main unit (grinding), a classifier, a fan, a pipeline conveying system, a finished‑powder collection system, and an automatic control system.

Working principle:
After the material is fed into the storage hopper, a feeder delivers it to the main mill in measured, uniform quantities for grinding. The ground powder is carried by a high‑pressure, high‑flow air stream generated by the blower into the classifier located at the top of the main mill for separation. Particles that fail to meet the target fineness are recirculated back to the main mill for further grinding, while those that achieve the desired particle size are conveyed with the airflow into a cyclone collector for collection. Once collected, the finished powder is discharged via a screw conveyor for packaging. The purified exhaust air flows through the cyclone collector’s ductwork back to the blower, creating a closed‑loop pneumatic conveying system. Any leakage from the system is routed through a bypass duct between the blower and the main mill, passes through a pulse‑jet baghouse filter, and is then released to the atmosphere. The entire pneumatic conveying system operates in a closed loop, ensuring environmental compliance within the workshop.

Technical Advantages and Features:
1. New-type roller assembly structure of the main machine:
(1) Grinding force is more than 10% higher than in conventional designs, significantly boosting production output.
(2) A new maintenance-free assembly featuring an “axial-plus-radial” sealing configuration: it offers high sealing reliability and extends the lubrication interval by more than fivefold compared to conventional designs.
(3) The connection between the roller assembly and the ends of the cross‑beam shaft employs a novel sealed wear‑resistant sleeve design, replacing the conventional rubber sleeve. This design offers superior reliability, extends service life by more than tenfold, and effectively ensures smooth operation of the roller assembly while reducing vibration in the main machine.

2. New structural design of the host:
(1) New-type sealing structure for the main unit: the central shaft is permanently wear-free.
(2) New structural design for the lower portion of the main unit’s central shaft: Seals can be replaced from the bottom of the main unit. By removing the main‑unit gearbox and detaching the main‑unit coupling, the seals can be accessed and replaced directly from the bottom, resulting in convenient, time‑saving maintenance with reduced labor intensity. Maintenance time is only one‑quarter that of conventional designs!!
(3) The main unit housing and the base adopt a flexible connection structure: a novel maintenance door design that ensures the housing remains crack‑free over time, featuring bilateral clamping mechanisms with rotational capability; the rotation is smooth and effortless, while providing excellent sealing performance.
(4) New-type blade assembly for the main unit: The blade facilitates uniform material distribution between the grinding rollers and grinding rings, enhancing grinding efficiency while ensuring a long service life.
(5) The compressor’s suction header adopts a high‑strength structure with edge‑reinforced ribs, offering superior structural strength and rigidity. The connection between the suction header and the base is sealed with an elastomeric material and secured by multiple rows of bolts, ensuring excellent sealing while preventing vibration‑induced cracking of the suction header.
(6) Innovative main‑unit plum‑blossom frame design: To replace the wear‑prone grinding ring, there is no need to disassemble the main‑unit plum‑blossom frame or other components; the grinding ring can be removed and installed directly from above the frame, making the process convenient, fast, and labor‑saving, while reducing maintenance time by three‑quarters compared with conventional designs.
3. The classifier employs a variable-frequency turbine-type classifier, offering high classification accuracy, high efficiency, and stable performance, with a classification fineness ranging from 80 to 400 mesh (continuously adjustable).
4. A dual‑cyclone collector is employed, offering high collection efficiency and improving performance by more than 10% compared to a single‑cyclone system.
5. Equipped with an integrated high-pressure blower: high conveying capacity and easy maintenance.
6. The residual dust is collected using a pulse-jet baghouse: it achieves high collection efficiency, eliminates dust emissions, and meets environmental emission standards.
7. PLC Intelligent Control: Automatic interlocked protection control of mill operation, one-button start/stop control via PLC, and centralized DCS control.

Scope of application:

It is suitable for the pulverization and processing of non‑metallic minerals with a Mohs hardness of 6 or lower and a moisture content of 6% or less, provided they are non‑flammable and non‑explosive—such as barite, calcite, marble, feldspar, limestone, dolomite, wollastonite, talc, gypsum, high‑alumina clay, bentonite, manganese ore, and similar materials.

Technical Specifications: