LM series sand powder vertical mill, also known as pre-grinding mill, is a large-scale high-efficiency and energy-saving sand powder preparation product developed by Liming Heavy Industry in combination with its own more than 30 years of research and development and manufacturing experience.
Input Size
<30-55mm
Capacity
30-900T/H
LM sand powder vertical mill is a kind of ultra-fine sand making and powder grinding equipment, which is mainly suitable for the prefabricated sand powder process before the crushing of mineral products such as metallurgy, building materials, chemicals, and mines. It is specially used for the preparation of special mortar fine aggregates. The finished sand powder of each grade can be prepared.
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1.Multipurpose
Sand and powder are produced at the same time, one machine has multiple uses Ultra-fine sand making and grinding equipment can prepare finished sand powder of various gradations.
2.Leading technology
It has a number of independent patent technologies and intellectual property rights, the main technical and economic indicators have reached the international advanced level.
3.High added value
The gradation of finished sand powder is adjustable and controllable, and the product has high added value.
4.High efficiency, energy saving and environmental protection
High production efficiency, low operating cost, simple operation, convenient maintenance, energy saving and environmental protection.
5.High-quality gradation
It solves the industry pain points of low yield and high energy consumption of conventional sand making equipment, and realizes the ideal preparation of high-quality graded sand for special mortar.
6.Low investment cost
The system is simple, the layout is compact, and the footprint is small.
Working Principle
The main motor drives the grinding disc to rotate through the reducer, and the material falls from the feeding port to the center of the grinding disc. Under the action of centrifugal force, the material moves uniformly from the center of the grinding disc to the edge and passes through the crushing roller area on the grinding disc, and is crushed by the grinding roller. The bulk material is directly crushed, and the fine-grained material is squeezed to form a material bed for intergranular crushing. The crushed material continues to move towards the edge of the grinding disc until it is thrown out of the grinding disc by the centrifugal force of the grinding disc, falls to the lower chamber of the mill, and is scraped into the discharge port by the scraper installed at the bottom of the grinding disc and then outside of the mill. The material is sorted in the external sorting or separation equipment, and the bulk or large particle material that exceeds the particle size of the finished product is recirculated into the mill for re-grinding until it reaches the appropriate particle size.
Sand‑powder ratio is jointly controlled by dam‑ring height, hydraulic grinding pressure, system air volume and classifier speed. Higher dam‑ring prolongs material retention time and increases powder ratio. Larger grinding pressure strengthens crushing and produces more fines. Larger air volume carries more fine particles; higher classifier speed intercepts coarse fractions. Avoid large single‑parameter modification. Tune parameters slightly, sample‑test grading and approach target ratio step‑by‑step.
LM sand‑powder vertical mill adopts material‑bed roller‑press crushing. Lower scraper mechanism discharges coarse sand, while fine particles go through top classifier for powder collection. It produces manufactured sand and powder in one single mill without two separate units. Sand‑powder ratio is adjusted by dam‑ring height, grinding pressure, air flow and classifier speed. Different from ordinary vertical mill, it is engineered for graded sand of mortar with one‑feed dual‑output process.
Traditional crushing‑ball‑mill scheme needs multiple equipment sets, multi‑story heavy‑load civil‑work buildings and long construction period. LM sand‑powder mill integrates crushing, drying, classification and sand discharging, featuring smaller footprint and lower foundation load, supporting open‑air layout and cutting civil‑work investment. However its overall height is large, demanding sufficient building height, lifting space and pipeline arrangement. Match equipment parameters in early civil‑drawing phase.
It is comes in several models with manufactured-sand capacity about 10 to 150 t/h. Small models suit aggregate matching; large models serve big sand bases. Select by material and target gradation for small or large lines.
Excessive recirculation mainly comes from insufficient grinding pressure leading to poor material‑bed crushing. Second, check air‑ring wind speed: low velocity fails to lift qualified particles, while over‑high velocity lifts coarse fractions and increases circulation load. Over‑feeding triggers material accumulation and higher recirculation. Do not increase feeding blindly. Verify grinding pressure and air velocity, stabilize grinding‑table material‑bed thickness before adjusting feed load.
Roller‑out design enables whole‑roller maintenance outside mill chamber without dismantling upper housing. It provides wide working space, improves wear‑part replacement efficiency and cuts downtime. Yet its hydraulic‑driven roll‑out mechanism requires strict operation procedure to avoid collision damage. Protect roller assembly from dust and moisture after roll‑out. Realign position after reinstallation to guarantee relative precision between roller and table and prevent running vibration.
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