Daesung Machinery: August 2013

Air Classifying Mill

This pulverizer has a classifier in the grinding chamber so it can freely adjust the particle size.
It is widely used for chemicals, powder coatings, foods, nonferrous metals, and others.
It is easy to clean and is suitable for multi-product production

NO	TITLE	MATERIAL
1	COVER	SUS304
2	HOUSING	SUS304
3	SEPRATOR	SUS304
4	MILL	SKD61
5	FRAME	SUS304
6	BEARING HOUSING	SUS304
7	BUFFLE RING	SUS304
8	SCREW FEEDER	SUS304

CM Series Classifying Mill

It is used to grind a large quantity of low-melting point materials. In order to prevent the materials
from being melted by grinding heat, it supplies cooling and dehumidifying air. For final distribution
of powder, a ultrasonic screen has been used

Description of ACM Pulverizer

ACM means Air Classifying Mill, which is able to adjust the particle size through
air classification when grinding. Grinding is done by pin and liner in the grinding chamber,
and classification is done by air classifier in the grinding chamber

Structure of ACM Pulverizer

ACM pulverizer is used to make the products of all the industrial fields into minute particles.
It is applicable for any of customers' requirements whatever the products to grind are such
as chemicals, foods, candies, cookies, minerals, powder coatings, plastics, etc.
The mostremarkable part of this ACM pulverizer is elaborate and nice arrangement ofits components.
The main motor and the housing are fixed on the steel frame, and the axle is rotated by V-belt.
V-belt is located under the frame and it is easy to change a shaft from the lower part

Flow of Handling Material and Air

A handling material is put into the pulverizer by table feeder.
Air that is absorbed through the inhaling pressure of SUCTION FANDML
and a handling material are mixed and grinded between the pin and the liner in the grinding chamber.
The grinded powder, along evenly distributed ascending currents, is moved to the air classifier part.
At this time, by the rotating speed of the air classifier, the centripetal force and the centrifugal force are created

Powder, influenced by the centripetal force, is absorbed up into the discharge nozzle (6),
together with air, and thick particles, influenced by the centrifugal force, can't pass through the classifier
so they go back to the grinding zone (8) to be grinded again. In order to make the particle size smaller,
rotational frequency of the air classifier should be increased. At this time, in order to prevent the phenomenon of
bottle-neck in the pulverizer, the speed of feeding a handling material into the pulverizer should be lowered

Pulverizing

ACM pulverizer works based on the principle of impact grinding.
It uses a wing that revolves at over 90m/sec. Grinding of particles is done by the material's
being crashed against the rotating pin (8) and the fixed liner (3)

Classifying

The special feature of ACM pulverizer is the classifier wheel (5).
By two opposite forces (the centripetal force and the centrifugal force) and mass difference of material particles,
it classifies large particles and small ones. The limit for classification is set by adjusting the speed of revolution
of the classifier, and the limit is possibly adjusted even while grinding

Application

● Powder coatings
● Wax and low-melting point materials
● Various resins
● Agricultural chemicals, insecticides, etc
● Dyes and paints
● Foods
● Medicines
● Various chemicals

Feature

● Grinding and classifying are done at the same time so it is easy to change the target particle size

● Its design is simple so it is easy to operate and clean

● Temperature rise is very small in spite of continuous grinding

● Particle distribution curve is immediately made after grinding so satisfactory particle sizes can be obtained

● It doesn't make serious noises, dusts, and arsenic acid so working environment is good

● Excessive grinding is prevented so grinding efficiency is very high

● For any others than low-melting point materials, it is possible to supply hot air to not only grind them,

but also dry simultaneously

Adjustment of Particle Size

The following chart will help you understand the process of adjusting the particle size

Basic Process
The following chart will help you understand the process of adjusting the particle size

Example of Particle Size

The following chart will help you understand the process of adjusting the particle size

SIZE	PASS	CHAN
1408	100.00	0.00
1291	100.00	0.00
1184	100.00	0.00
1096	100.00	0.00
9	100.00	0.00
91	100.00	0.00
837.2	100.00	0.00
767.7	100.00	0.00
704.0	100.00	0.00
645.6	100.00	0.00
592.0	100.00	0.00
542.9	100.00	0.00
497.8	100.00	0.00
456.5	100.00	0.00
418.6	100.00	0.00
383.9	100.00	0.00
352.0	100.00	0.00
322.8	100.00	0.00
296.0	100.00	0.06
271.4	99.94	0.09
248.9	99.85	0.10
228.2	99.75	0.13
209.3	99.62	0.15
191.9	99.47	0.16
176.0	99.31	0.15

SIZE	PASS	CHAN
161.4	99.16	0.15
148.0	99.01	0.17
135.7	98.84	0.17
124.5	98.67	0.16
114.1	98.51	0.18
104.7	98.33	0.27
95.96	98.06	0.39
88.00	97.67	0.55
80.70	97.12	0.87
74.00	96.25	1.39
67.86	94.86	2.26
62.23	92.60	3.54
57.06	89.06	5.09
52.33	83.97	6.95
47.98	77.02	8.38
44.00	68.64	9.33
40.35	59.31	9.44
37.00	49.87	8.70
33.93	41.17	7.59
31.11	33.58	6.14
28.53	27.44	4.88
26.16	22.56	3.79
23.99	18.77	2.95
22.00	15.82	2.36
20.17	13.46	1.93

SIZE	PASS	CHAN
18.50	11.53	1.64
16.96	9.89	1.43
15.56	8.46	1.29
14.27	7.17	1.19
13.08	5.98	1.10
12.00	4.88	1.00
11.00	3.88	0.90
10.09	2.98	0.79
9.250	2.19	0.66
8.482	1.53	0.53
7.778	1.00	0.41
7.133	0.59	0.30
6.541	0.29	0.19
5.998	0.10	0.10
5.550	0.00	0.00
5.044	0.00	0.00
4.625	0.00	0.00
4.241	0.00	0.00
3.889	0.00	0.00
3.566	0.00	0.00
3.270	0.00	0.00
2.999	0.00	0.00
2.750	0.00	0.00
2.522	0.00	0.00
2.312	0.00	0.00

SIZE	PASS	CHAN
2.121	0.00	0.00
1.945	0.00	0.00
1.783	0.00	0.00
1.635	0.00	0.00
1.499	0.00	0.00
1.375	0.00	0.00
1.261	0.00	0.00
1.156	0.00	0.00
0.060	0.00	0.00
0.972	0.00	0.00
0.892	0.00	0.00
0.818	0.00	0.00
0.750	0.00	0.00
0.688	0.00	0.00
0.630	0.00	0.00
0.578	0.00	0.00
0.530	0.00	0.00
0.486	0.00	0.00
0.446	0.00	0.00
0.409	0.00	0.00
0.375	0.00	0.00
0.344	0.00	0.00
0.315	0.00	0.00
0.289	0.00	0.00
0.265	0.00	0.00

Photograph for Reference

It is applied to grind resins.
In order to prevent a drop of the grinding efficiency by rise of
air temperature in summer,it has employed a cooling unit so the
operator can set desirable temperature and humidity of
air to supply. (i.e.:15℃ x RH65%)

ACM10 SERIES

It is applied to scatter a secondary cell material.
The particle size of the secondary cell material is average 5㎛ ,
but it sometimes lumps in the process of drying. ACM10 Series is
used to scatter this lump under the condition that this round
particle is maintained

Reference Data

MATERIAL	FINENESS	ACM10	ACM30	ACM60
MATERIAL	FINENESS	Kg/hr
Coal	325mesh	400	1300	2500
Copper oxide	325mesh	370	1100	2200
Limestone	100mesh	450	1200	2400
Limestone	d97 30㎛		200
Limestone	d83 76㎛	800	2400	4800
Phenolic resin	200mesh	200	600	1200
Phenolic resin	d90 30㎛			870
Corn flour	325mesh	110	350	700
Silica	d50 7~10㎛			600
Pigment	d99 18㎛		350
Coating powder	d99 90㎛		150 ~ 250	600 ~ 1000
Sulphur	d99 63㎛		150
Silica gel	d99.9 200㎛		180
Soy protein	d99 93㎛			1000
Soy protein	d97 44㎛	40	120	240
Talc	d99 20㎛			700
Toner	d50 25㎛			120
Sugar medium	200mesh 98%	270	700	1400
Sugar fine	325mesh 99%	170	400	750
Active alumina	d98 44㎛	200	610	1220
Alumina catalyst	d50 5~10㎛	120	330	600
Kaolin	d99 53㎛	90	230	450

Spiral Elevator

The spiral elevator serves to convey materials upwards by means of powerful three-dimensional vibration. According to its operation method, this elevator system is divided into three different types:

1. Forced Vibration Type: This is the most common type of spiral elevator. Two unbalance motors (vibration motors) are mounted in opposite directions on the drive base, and oscillations generated by the rotation of these vibration motors are forcibly delivered to the drive base. This type of spiral elevator is simple and easy to fabricate, but there are restrictions on size applicability because of limited motor dimensions and amplitude. In general, this operation type is applicable where the trough diameter is ∅1500 mm or less and when an amplitude of 15 mm or less is required. (Operating range: 2-15 mm in amplitude and 1800- 600 VPM in vibration frequency)

2. Exciter Type: This operation type is mainly applied when it is necessary to operate a large-size model especially in high-amplitude low-frequency domains. Adopt the exciter type when you have to handle such materials that require system operations at high amplitudes of 12-40 mm which cannot be formed by the forced-vibration type system with unbalance motors mounted on it (esp. viscous or rubber-like cushioning materials), or when it is needed to convey a large amount of material. (Operating range: 12-40 mm in amplitude and 800-350 VPM in vibration frequency)

3. Electromagnetic Resonance Type: This operation type is designed to generate vibrations using electromagnets and applied when low-amplitude high-frequency operations are needed. The type of system is used mainly for the transfer of small-size components or additives that require small-capacity precision operations.


[ Forced Vibration Type-DSSE SERIES ]	[ Exciter Type-DSSE-E SERIES ]

Advantages of the Spiral Elevator

- The installation area is minimized.
- Easy to clean
- Installable at low cost
- The maintenance cost is low.
- The noise is small.
- A long stay time makes it suitable for materials to being dried and cooled down at the same time while being conveyed.
- The stay time is controllable.
- Able to convey viscous materials as well.

Applications

■ POLYMER
   - Slightly viscous materials (incl. synthetic rubber and resins) dehydrated after going through a polymerization process.
    [SSBR, SBR, HBR, EPDM, NDBR, ABS, SAP etc. ]

■ PETROCHEMICAL POWDER & GRANULE
   - Petrochemicals in powder or granular form

■ ENGINEERING PLASTICS PELLET
   - Applicable to the cooling and vertical transport of pellets in post-extrusion processes
    [PP, PE, ABS, EP etc. ]

■ FOOD, SNACK & SEASONING
    - Dry milk, cheese, candies, snacks, cereals, condiments, etc.