Overview
What Is A European Coarse Grinder
The European coarse grinder is a hammer-type mill built for coarse powder rather than fine grinding. It is made up of a frame, rotor, hammers and grizzly bars. The frame is split into upper and lower sections welded from steel plate and bolted together, while the rotor carries the hammers that do the work. Compared with a standard hammer mill, it uses a larger motor and a more stable power transmission system, so the grinding process stays continuous and steady under high throughput.
Where It Is Used
It handles medium and fine crushing of soft and hard ores with compressive strength up to 320 MPa and serves metallurgy, mining, chemicals, cement, coal gangue, construction, sand making, refractories and ceramics. Typical duties include calcium carbonate grinding, gypsum powder, power-plant desulfurization, non-metallic ore milling and coal powder preparation.
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Working principle
Impact Grinding By Rotating Hammers
The motor drives the main shaft through a V-belt and turns the rotor. The hammers swing outward under centrifugal force. When bulk material enters the grinding chamber, the high-speed hammers strike it and break it against the frame and breaker surfaces.
Grizzly-Bar Discharge
Material that reaches the target size passes through the grizzly bars at the lower part and is discharged. Oversize material stays in the chamber and is struck again until it can pass. To prevent clogging, the moisture of the feed should not exceed 5%, since wet material tends to block the bar gaps.
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Features & Benefits
1. High throughput and reduction ratio. The large rotor and motor handle 35-100 t/h in one pass.
2. Even particle size. The grizzly bars hold a consistent 0-3 mm product.
3. Simple, compact structure. The welded frame is straightforward to install and service.
4. Low power use per tonne. Impact grinding is efficient for coarse duties.
5. Low investment and maintenance. Wear parts are limited mainly to hammers and bars.
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Specifications
Model PC4008-75 PC4012-90 PC4015-132 Diameter of the rotor(mm) 750 900 1150 Length of the rotor (mm) 800 1200 1500 Rotation speed of the rotor 800-1000 800-1000 550-800 Max.feed size(mm) ＜70 ＜90 ＜100 Size of outputting (mm) 0-3 0-3 0-3 Capacity (t/h) 35-50 50-70 70-100 Power(kw) 55-75 75-90 110-132 No.of the hammers 18 16 32 Overall dimension (L×W×H) 2130×1665×1610 2840×2100×2020 3720×2650×2540 -
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