Planetary Micro Milling – PBM

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CE Certified Insmart Planatery Ball Mill (PBM) is ideal for analytically pure and contamination free batch grinding of test samples in dry as well as in suspension from as large as 10 mm particle size down to extreme end fineness. Most suitable for thorough mixing, homogenising, emulsifying and dispersing.

Principle of Operation

Grinding is carried out by high-energy frequent impact of balls. The energy level of balls are as high as 50 times (at 400 r.p.m.) the gravitational acceleration. Thus, Insmart Planetary System makes grinding extremely fast and efficient. Rotation of base plate provides the centrifugal force to the grinding balls and independent rotation of bowls (in opposite direction) makes the balls to hit the inner wall of the bowls several times more, because of the short returned path. Since the bowls are rotating in opposite direction a considerable part of grinding is done due to friction.

FINAL FINENESS:- Less than 1 micron upto nano levels.
CONTAMINATION:- Analytical pure grinding.
SPEED RATIO:- 1:1, 1:2, 1:3 or 1:4 between sun disc and bowl (user to select).
HOMOGENIZING:- Homogenizing is achieved by continuous mixing during grinding process.
Reproducible Grinding / Homogenizing.
Permanently Lubricated Bearings.
COOLING:- An air exhaust system is provided to enhance the grinding time. (ventilator).
MAINTENANCE FREE:- Systems is driven through a self-diagnostic type micro-controller based A.C. frequency controlled drive, having various setting and indicating parameter.
Machine can run uninterruptedly upto 10-12 hours.

OPTIONAL FEATURES:

RS 232 port.
Continuous purging of inert gas, while grinding in single bowl system.
Special bowl set designed for inert/ special atmosphere grinding – suitable for charging and removal in a glove box.
Special bowl set designed for low temperature operation (liquid nitrogen).
Measurement of temperature and pressure of gas inside the bowl while in operation.
Embedded Thermo-electric device for external cooling of bowls during grinding (cold air circulation).

SAFETY FEATURES:

DOOR SENSOR:- If door is not closed properly machine will not start.
MOTOR OVER LOAD PROTECTION:- The system is built in with self diagnostic, over load, high voltage and low voltage protection.

OPTIONAL SAFETY FEATURES:
VIBRATION DETECTION SYSTEM:- Undesired vibration due to imbalance load is detected by a sensor to switch OFF the machine Automatically.
DOOR LOCK:- An electromagnetic automatic lock is provided, it locks the safety cover as soon as start command is given.
Fault indication with audio-visual alarm.

Hardened Steel
Stainless Steel
Stabilized Zirconia (ZrO2-98%)
Tungsten Carbide Lined / Coated
Agate
Corundum
Toughened Alumina
High Density Polyethylene
Polyurethane
Tungsten Carbide lined with Ti Al N coating

APPLICATION For fine and ultra fine grinding of soft medium and hard materials.
FEED SIZE Up to 10 mm
OUTPUT PARTICLE SIZE 1 micron or smaller (depending on characteristics of material, number & size of balls, time and speed selection)
SPEED (setting and digital display) Sun Disc speed for regular model 40 to 400rpm / for mini models 40 to 600 rpm
DIRECTION ROTATION PROGRAMMABLE: Forward/Reverse/Alternate with LED indication
TIME (Setting & digital display) RUN TIME (1-999Min/Sec) + OFF TIME (1-999Min/Sec) = 1 CYCLE, NO. OF CYCLES (1 TO 999)  TOTAL TIME=(RUN TIME+OFF TIME)*NO. OF CYCLE
NUMBER OF BOWLS 1 (single), 2 (twin), 2 to 4 large (250 ml useful capacity), 4 or 8 small  (80 ml. useful capacity)
MATERIAL CONSTRUCTION Hardened steel with tough core /AISI 304-SS/ Agate / Polyurethane / Ceramic / Lined Tungsten carbide / Zirconia / Toughened alumina / Corundum (natural and sintered)
POWER SUPPLY SINGLE PHASE 230V A.C. 50/60 HZ, 10 Amp 2 Pole MCB with Proper earthing
MOTOR & DRIVE 1.5Kw (2HP). Microprocessor based variable frequency drive.
WEIGHT & DIMENSIONS Machine : 300kg  860x560x730mm   Packed :  470kg  1066x787x1016 mm (wooden box)

200 Grams of Sample having feed size -10 mm was ground in 500 ml Tungsten Carbide Lined Bowl with overall Ball Weight 600 Grams with ball to charge ratio of 1:3. Sample was grinded in two stages i.e. Primary Cycle (For reducing Particle Size from – 10 mm to 150 mesh (100 microns)) and Secondary Cycle (For reducing Particle Size from 150 Mesh to 400 Mesh (37 microns). After completion of Primary Cycle ball size/ diameter was reduced for grinding small particle size – 400 mesh (37 microns). The reduction ratio recorded after sieving the samples was 1:15. The sound level recorded of the equipment was -75 db with temperature raised during grinding material of Bowl was upto 60 OC and lid upto 40 OC. The following table mentions the results of grinding with reference to time of grinding & rpm of the Planetary Ball Mill (PBM-07):

Granite Samples (Hardness 5 – 6 mhos scale)

  1. RPM

    260
    Grinding Time  for primary cycle 20 mins Dia.20 mm (7 Nos),Dia. 16 mm(6 Nos)
    Grinding Time  for Secondary cycle 45mins Dia.20 mm (8 Nos),Dia. 16 mm(43 Nos)
    Primary Cycle Secondary Cycle
    Screen Size (Mesh) Weight %   Screen Size (Mesh) Weight %
    +150 0 +400 2.4
    -150 100 -400 97.6
    Total 100 Total 100

    RPM

    300
    Grinding Time  for primary cycle 20 mins Dia.20 mm (7 Nos),Dia. 16 mm(6 Nos)
    Grinding Time  for Secondary cycle 45 mins Dia.20 mm (8 Nos),Dia. 16 mm(43 Nos)
    Primary Cycle Secondary Cycle
    Screen Size (Mesh) Weight % Screen Size (Mesh) Weight %
    +150 0 +400 1.3
    -150 100 -400 98.7
    Total 100 Total 100

    RPM

    350
    Grinding Time  for primary cycle 20 mins Dia.20 mm (7 Nos),Dia. 16 mm(6 Nos)
    Grinding Time  for Secondary cycle 45mins Dia.20 mm (8 Nos),Dia. 16 mm(43 Nos)
    Primary Cycle Secondary Cycle
    Screen Size (Mesh) Weight % Screen Size (Mesh) Weight %
    +150 0 +400 0
    -150 100 -400 100
    Total 100 Total 100

     

Iron Ore Samples (Hardness 5 – 6 mhos scale)

  1. RPM

    240
    Grinding Time  for primary cycle 20 mins Dia.20 mm (7 Nos),Dia. 16 mm(6 Nos)
    Grinding Time  for Secondary cycle 45mins Dia.20 mm (8 Nos),Dia. 16 mm(43 Nos)
    Primary Cycle Secondary Cycle
    Screen Size (Mesh) Weight % Screen Size (Mesh) Weight %
    +150 3.5 +400 3.2
    -150 96.5 -400 96.8
    Total 100 Total 100

    RPM

    300
    Grinding Time  for primary cycle 20 mins Dia.20 mm (7 Nos),Dia. 16 mm(6 Nos)
    Grinding Time  for Secondary cycle 45 mins Dia.20 mm (8 Nos),Dia. 16 mm(43 Nos)
    Primary Cycle Secondary Cycle
    Screen Size (Mesh) Weight % Screen Size (Mesh) Weight %
    +150 3.8 +400 # 8.2
    -150 96.2 -400 # 91.8
    Total 100 Total 100

Planetary Micro Milling – PBM – Variants

Planetory Ball Mill - PBM

Planetary Micro Milling – PBM – Range of Bowls & Balls

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