Four tank planetary ball millIt is a high-energy grinding equipment designed based on the principles of planetary revolution and rotation, widely used in laboratory and industrial fields for material crushing, mixing, and homogenization treatment. Its core design lies in symmetrically arranging four independent grinding tanks on the same turntable, achieving efficient grinding through composite motion, and possessing multitasking capabilities and nanometer level precision.
Its working principle: When the equipment is running, the turntable drives four grinding tanks to revolve around the central axis, while each tank rotates in the opposite direction around its own axis, forming a speed ratio of 1:2 to 1:2.33. This planetary motion causes the grinding ball inside the tank to spiral and move at high speed under centrifugal force, exerting triple forces of impact, shear, and friction on the material.
Four tank planetary ball millThe components of:
1. Main frame
Function: The supporting framework of the entire device, carrying all other components.
Characteristics: It is usually made of high-strength cast iron or steel structure, sturdy and heavy, capable of effectively absorbing and offsetting strong vibrations generated during the grinding process, ensuring smooth operation of the machine.
2. Drive motor
Function: Provide power source to drive the sun gear (turntable) to rotate.
Features:
Sufficient power (usually above 0.75 kW) to cope with high loads.
Adopting variable frequency motors or equipped with speed control devices to achieve stepless speed regulation.
Equipped with overload protection device to prevent motor damage caused by overload.
3. Sun Wheel/Rotary Wheel
Function: Connect and drive four ball milling tanks to rotate.
Features:
Installed on the motor spindle, it rotates at high speed with the motor.
There are four symmetrically distributed installation positions on the disc for fixing the ball mill jar.
It is one of the key components that generate planetary motion.
4. Ball milling jar
Function: Contains samples, grinding balls, and (optional) grinding media, serving as a container for the actual grinding process.
Features:
Quantity: The standard configuration is four, symmetrically installed on the sun gear.
Diverse materials: According to application requirements, different materials can be selected for the tank body, commonly including:
Tungsten carbide
Stainless Steel
Agate/Quartz
Zirconia (ZrO ₂)
Polymers such as polytetrafluoroethylene (PTFE) and nylon
Diverse volumes: Common specifications include 50ml, 100ml, 250ml, 500ml, etc.
Sealed design: equipped with a sealing cover and sealing ring (such as O-ring) to prevent sample leakage and external contamination. Some models support inert atmosphere protection.
5. Grinding ball
Function: As a grinding medium, it crushes samples through impact, compression, and shear in a ball milling jar.
Features:
Match the material with the ball milling jar (such as stainless steel ball with stainless steel jar, zirconia ball with zirconia jar).
There are various diameters (such as 1mm, 3mm, 5mm, 10mm, 20mm), and balls of different sizes are often mixed in proportion to improve grinding efficiency.
The ball to material ratio (the ratio of the total mass of the grinding ball to the mass of the sample) is a key grinding parameter.
6. Can seat/clamp
Function: Securely fix the ball mill jar onto the sun gear to prevent it from loosening or falling off during high-speed rotation.
Features:
Usually metal clamps or quick release locking devices.
The design needs to ensure easy loading and unloading and reliable locking.
It is an important safety component.
7. Control system
Function: Control the operating parameters and status of the machine.
composition
Control panel: located on the front of the body, including a display screen, buttons, or knobs.
Core components:
Speed regulator: Set the revolution speed (RPM) of the sun gear.
Timer: Preset grinding time, automatically stops when the time is up.
Forward and reverse switch (optional): The program can be set to alternate between forward and reverse operation.
Start/Stop button.
Display: Real time display of set speed, actual speed (for some high-end models), running time, and status.
8. Safety protection device
Function: Ensure the safety of operators and equipment.
Main device:
Safety interlock switch: The machine can only be started when all the covers of the ball milling tanks are correctly locked and the tank seat clamps are fixed in place. When opening the lid or loosening the clamp, the machine will automatically power off.
Overload protection: Automatically stop the motor or circuit when overloaded.
Emergency stop button: In case of emergency, the power can be immediately cut off.