Ultrafine Roller Grinding Mill

YFM series Yifeng grinding mill is a new-type grinding mill developed by our company for decades, combining rolling, impacting and grinding to one. It is an idea micro-fine grinding mill for deeply processing such non-metal minerals as calcium carbonate, barite, talc, gypsum, calcite, limestone, calcium oxide, bentonite, dolomite etc.

Structure of Grinding System:

Working Principle:

Frequency-conversion feeder shall feed material to the central part of upper grinding-plate evenly. The material falls to circle under the centrifugal force and comes down to raceway of ring to be crushed into powder. After grinded in the first raceway, the material goes to the second and third raceway. The air blower inhales the external air into the mill and carries the powder after third grinding-plate into classifier. Classifier wheel makes the coarse powder drop down and then regrinded, the fine powder shall go into cyclone collector together with air current and go down through discharge valve as final product; at the same time, air current with a little dust goes out through blower and muffler after purified by filter.

Part 1: Main unit (Grinding system)

Raw material is fed into grinding chamber via feed port of upper part, then be grinded between rollers and grinding rings into powders. Powders are blowed into upper part. Qualified particle goes into powder collecting system through classifier wheel, others fall and be grinded again.

Part 2: Deduster (Powder collecting system)

In reverse-pulse-jet baghouses, individual bags are supported by a metal cage, Dusty air enters from the bottom of the baghouse and flows from outside to inside the bags. Bags are cleaned by a short burst of compressed air injection. The powder falls into a storage hopper below. This collecting system works with the help of digital sequential timer (PLC) attached to the pulse valves.

Part 3: Electric control or PLC system

Adapting domestic top level electric components, after 20 years' testing. Our electric control or PLC system is very easy to operate, fully automatic operation, and one button stop, It's also easily adjust. Buyer only needs to adjust current and frequency with visible digitals to reach different particle size from 325-3000 mesh.

Process Flow Diagram:

Performance and Advantages:

1. Both product size and fineness are guaranteed.
The new YFM grinding mill is able to reach a product fineness of 325 - 2500 mesh one time, while the traditional Raymond mill can only reach a fineness of 400 mesh for the most. It can be used for all kinds of grinding from coarse crushing to ultrafine grinding, with the largest fineness of up to D97≤3um, which drives the revolution in the field of ultrafine grinding.

2. Low investment cost and high output efficiency.
Compared to ball mill, air-flow mill and stirred mill, YFM grinding mill has the advantages of lower investment and shorter processing circle, and its finish fineness/efficiency ratio is more than twice that of the machines mentioned above for the same fineness.

3. Low maintenance cost and simple operation
Compared to Raymond machine, YFM grinding mill has no bearings and screws but the high-hardness wear-resistant material developed by the our company within the grinding chamber, which not only avoids chronic consumption of oil and burnt bearing, but also guarantees the continuous and reliable operation of the machine.

4. Installation of the complete set of equipment is convenient.
No need large-scale construction, it covers only small area. It can be put into production as soon as we finish installing. It can run smoothly and reliably. It is used for grinding non-metal mines with Mohs' hardness scale less than 5, moisture less than 5% and Max. input size 10mm.

5. Environment friendly without pollution.
Adopting the complete set of negative-pressure production and high-efficient off-line deduster, its dust collection efficiency reaches up to 99.9%, which guarantees no dust pollution during operation. Moreover, the main unit and the air blower are respectively equipped with the noise-reduction housing and the muffler so as to decrease the noise, which is completely in conformity with the national environmental protection standards.

6. This equipment is sophisticated and stable.
Continuous improvements have been made within the decade since the establishment of our company; the complete machine from its materials, its processing to its assembly, is completely self-produced, which forms as the benchmark for the crushing industry and becomes the one being simulated at home and abroad.

Specifications:

Contrast form among mesh, output and Electric power consumption:

Note: The above parameters regarding processing of calcite are used for reference only; there might be slight differences regarding different materials.