Small hammer mills are often used to shred or crush materials into smaller pieces. The basic design of machines of this type involves a rotating shaft to which free-swinging hammers are attached. This equipment is enclosed in a drum which holds the materials to be pulverized. When the machine is running, raw material is first fed into the chamber through a hopper. In the chamber, the hammer mill gradually breaks up the material until it is small enough to fall through a screen with openings corresponding to the desired particle size. Hard materials won’t damage the machine because the hammers are hinged to the shaft. If the hammers are worn out, they can be replaced with new hammers.
Because not all biomass raw materials are suitable for pelletizing directly, small hammer mills are most commonly used as auxiliary equipments in livestock production. Small hammer mills can process materials like sawdust, corn stalk, peanut shell and grass. What’s more, in order to meet different needs of livestock production, the machine is able to process various particle sizes by changing the output screen.
Application and working principles of small hammer mills
Small hammer mills are applicable for various hard and fragile materials, such as limestone, coal, salt, gypsum, alum, brick and tile, etc. The crushing compressive strength of materials should below 150Mpa. These crushing equipments are widely used in industries and livestock such as cement, coal separation, electricity generation, building materials lumbering and compound fertilizer. They can crush materials into desired sizes that favor the next procedure. Reliable mechanical structure, high productivity and favorable applicability are the three main advantages of small hammer mills.
Small hammer mills work on the principle that most materials will crush, shatter, or pulverize upon impact. Material is fed into the mill’s chamber through the feed chute, typically by gravity, where it is struck by ganged hammers attached to a shaft that rotates at high speed inside the mill’s grinding chamber. The material is crushed or shattered by a combination of repeated hammer impacts, collisions with the walls of the grinding chamber, and particle on particle impacts. Perforated metal screens or bar grates covering the discharge opening of the mill retain coarse material for further grinding, while allowing properly sized materials to pass.
Small hammer mills from GEMCO
Small hammers mill from GEMCO are designed by supreme engineering techniques. Refers to the TFS series hammer mill, GEMCO has produced two different driving forces of hammer mills: electric motor and diesel engine.
As a manufacturer and supplier of small hammer mills, GEMCO has always been devoting himself to provide various types of hammer mills with high quality and affordable prices. It is an excellent raw material crushing equipment working together with a pellet mill.
| Model | Power | Size (mm) |
Net weight (kg) |
Spindle Speed (r/min) |
Screen | Capacity (kg/h) |
| 420B-7.5 | 7.5KW(electric motor) | 1200×1000×1220 | 285/310 | 3200 | 1.2-10 | 300-600 |
| 420B-11 | 11KW(electric motor) | 1200×1000×1220 | 310/330 | 3200 | 1.2-10 | 300-600 |
| 420A-15 | 15HP(diesel motor) | 1400×1000×1200 | 340/400 | 3200 | 1.2-10 | 300-600 |
| 420A-22 | 22HP(diesel motor) | 1400×1000×1200 | 370/410 | 3200 | 1.2-10 | 300-600 |
| 500A-55 | 55HP(diesel motor) | 2000×900×1700 | 400/420 | 3200 | 1.2-10 | 600-800 |
Features and advantages of small hammer mills from GEMCO
For the small farmer or any other user wishing to add value to his operation, the small hammer mill presents a cost effective, sensible and practical option. The benefits are low capital and low running costs, minimal maintenance, faster milling times and more hygienic milling conditions.
The user can immediately start earning an income with the hammer mill. Where an organization or group uses it, it will have an immediate effect on the quality and speed with which the biomass pellet products can be delivered.
Biomass pellet machines are designed and built in Africa for African conditions. For a small investment a big return can be obtained in terms of monetary advantages if used as an income producing asset, or in the improvement in the quality of life if supplied to groups or communities to mill for food for their daily needs.
Advantages of small hammer mills from GEMCO
- Easy to operate and maintain
- Energy saving and less dust.
- Reward quickly
- Low noise and slight vibration
- Compact structure
- Sturdy and durable
- High efficiency and low consumption
Other components and spare parts of small hammer mills
GEMCO offer an extensive line of hammer mills suitable for a wide variety of applications, and include wood grinders, industrial, full circle screen, and laboratory scale styles. Most models are available in gravity or pneumatic discharge.