LYH998 series new environmentalgrinding production line is mainly composed of jaw crusher, elevator, storage silo, belt conveyor (with iron remover), grinding mill (with separator), centrifugal induced draft fan, pulse dust filter, cyclone powder collector, airlock unloader, screw conveyor and other equipments.
LYH998 series new environmental grinding mill is a vertical complete structure which covers a small area and the main machinedrive device adopts closed gear box which can drive smoothly. The important parts of the mill are made of high-quality steel, so the whole machine is wear-resistant and reliable. The electrical device of the mill adopts centralized control of advanced and reasonable selection, and high degree of automation. Belt speed feeder can ensure the amount of material in the mill, which is easy to adjust and maintain and very power saving. The mill is operated under full negative pressure, and the site environment has been significantly improved.

The grinding mill is mainly suitable for grinding processing of metallurgy, building materials, chemical industry, mining and other mineral materials. It can grind limestone, calcite, calcium oxide, calcium hydroxide, quartz, feldspar, talcum, barite, fluorite, rare earth, marble, ceramic, bauxite, manganese ore, iron ore, copper ore, phosphate ore, iron oxide red, zircon sand, slag, water granulated slag, cement clinker, activated carbon, dolomite, granite, garnet, Iron oxide yellow, soybean cake, chemical fertilizer, compound fertilizer, fly ash, bituminous coal, coking coal, lignite, rhodochrosite, chromium oxide green, gold, red mud, clay, kaolin, coke, gangue, china clay, bluestone, fluorite, bentonite, medical stone, rhyolite, greenstone, pyrophyllite, shale, purple sands, chlorite, multiple rocks, basalt, gypsum, graphite, silicon carbide, thermal insulation materials and all kinds of non-flammable and explosive mineral materials which Moh's hardness is below 7 grade and water content below 6%. The granularity of the finished product can be adjusted between 0.25 and 0.023 millimeters (equivalent to 60 mesh and 600 mesh) according to different requirements.

Note:*The output shown in this table takes limestone which finished product particle size of 0.075 (200 mesh) through the sieve rate of 80% as an example. The actual output changes with the system parameters and raw material properties.
*The moisture content of raw materials is below 3%.
*No further notice if the technical parameters change.
*Please consult Liyuanheng's technical engineers for information on system configuration and output under specific working conditions.

After crushed by the jaw crusher, the lump materialis sent to the raw material bin by the elevator or belt conveyor, and then the material is fed into the grinding chamber of the main machine by the belt conveyor for grinding in a uniform and quantitative continuous manner, relying on the grinding roller device hanging on the plum blossom frame in the main machine, rotating around the vertical axis, and the grinding roller rotating itself at the same time. Due to the role of centrifugal force when rotating, the grinding rollers swing outside, tightly pressed on the grinding ring, so that the material shoveled up by the scraper is sent to the space between grinding rollers and the grinding ring, and then crushed and ground by the rolling and extruding of the grinding rollers. After the material ground, the fan will blow the wind into the host grinding chamber, the powder is separated by the cage separatorplaced above the grinding chamber. The coarse powder will fall into the grinding chamber to regrind, the qualified fine powder will enter into the cyclone collector along with airflow. The collected fine powder discharged by ash valve isthe finished product. Airflow passes through the cyclone collector and then enters the fan to form a closed loop, to make the machine work continuously. The residual air enters the dust filter through the residual air pipe and is discharged after purification.

1. Preparation matters before installation of the grinding mill

2. Grinding mill installation

Before starting the grinding mill, check whether all inspection doors are closed tightly. Start the grinding mill in the following order: (under normal condition, it is recommended to use the computer one-key start-stop function)

2.When stopping the machine, each equipment should be shut down in the reverse order of starting.

3.Notes of grinding mill operation:

Due to the dusty working environment and harsh condition of the grinding mill, lubrication must be carried out in accordance with the lubrication table (see table) in order to ensure the normal operation and life of the machine.
When the new machine is used, there will be iron particles falling from the bevel gear of the drive part of the machine, to prevent the machine from quickly wear out, the oil should be changed once after 300 hours of starting, and then the oil should be changed according to the period of the lubrication table. Each time ofoil changing,drain out the old oil and clean the inside with kerosene or diesel oil, and then inject the new lubricant. At the same time, pay attention to the oil level. The oil level of spindle drive device is the oil window lower line. Do not make the rotating direction wrong of the drive device which lubricated by spiral oil pump, otherwise the oil pump will not work and result in bearings without oil.
The oil level of the reducer boxes of airlock feeder and elevator as well as fan drive box should be half of the oil mark.
The lubricating oil should be filtered before filling, and the grease nipple should be wiped cleanlyto prevent dust.
The working conditions of the grinding roller assembly are particularly harsh, so its bearing lubrication should be ensured and it should be cleaned regularly.

1.When the new machine is put into production, the looseness of the connecting bolts of each part should be checked frequently, especially the bolts of the main machine and the grinding roller device.
2.The grinding mill should have special management during use.The operator should be trained to understandsthe principle and performance of the mill, and be familiar with the operating procedures before starting the job.
3.In order to make the grinding mill work properly, the “maintenance and safe operating regulations” of the equipment should be formulated to ensure the long-term normal operation of the grinding mill, and at the same time it should have necessary maintenance tools, lubricating oil and accessories.
4.The grinding mill should be overhauled after a certain period of time. Repair and replace the wearing grinding rollers, grinding rings, scraper etc. When replacing the grinding rollers, all grinding rollers inside the mill must be replaced at the same time to ensure the balance of the main machine.
5.When the service time of the grinding roller device exceeds 500 hours or so, the grinding roller assembly should be removed for cleaning and maintenance.Clean the dirty oil and dust cleaning inside it and replace the wearing parts in time. Generally, remove the covers at both ends to clean the bearings.If the inside is too dirty or it is not cleaned for two or three cleaning cycles, it should be completely removed for cleaning and maintenance.

The following points should be noted when disassembling the grinding roller assembly.
a. The disassembly site should be clean and free of dust.
b. The upper bearing nut and the lower bearing nut are positive and negative nuts, pay attention to the direction of rotation when tightening or loosening.
c. The upper and lower bearings are lubricated with No.3 molybdenum disulfide grease, and it is suitable for the grease to fill half of the bearing gap.
d. The wool felt ring should be soaked with oil.
e. The bearing cover is sealed with mechanical sealant.
f. Seal the felt or asbestos packing through the slotted nut thin ring. When the slotted nut is pressed, it should not be too tight or too loose to make the roller drive flexible. The compression bolt should deform the thin ring of the slotted nut. Periodically check whether the bolts on the slotted nuts are loose.
g. After the assembly is completed, the grinding roller should rotate flexibly.

6. The grinding mill should have a major maintenance every 2000 hours.Clean the gear box and all drive components, replacegear oil, repair and replace the wearing parts, to ensure the normal operation of the machine.