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RISHWIN SINGH SINDA
06DEM09F1043
MECHANICAL DEPARTMENT
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Rename the following drawings :-
a) 30-BATU ARANG
b) 31-QUARRY No.1
c) 32-QUARRY No.2
d) 33-RAILWAY
e) 34-COAL PLANT
f)
36-RM STOREg) 41-GRINDING MILL HOUSE
h) 42-CEMENT MILL 1,2 & 3
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1. Roller Press can also be called as a Grindingplant.
2. High pressure roller press has been employedfor grinding materials for many years now.
3. In the most recent generation of such grindingplants the high pressure roller press operates
in closed circuits with a Hammer Mill .
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Hydraulic Cylinder Spacer Plate
Hydraulic Pump Spacer Frame
Movable RotorStationary Rotor
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� The purpose of the spacer frame is to hold thespacer plate .
� Why the spacer frame is needed to hold the spacerplate is because to adjust the Rotor Gap .
� The new rotor gap after rebuilding or the newrotor must be about 18 mm in size.
� And the spacer plate will be around 35 mm in size.
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� After the rotor is warn out or wear , the size of the rotor gapwill increase to about 22 mm .
� Why does the size of the rotor gap increases from 18 mm to
22 mm .
� This is because the the two rotors are crushing againts eachother .
� This action (crushing of the two rotors) will repeat till thesize of the spacer plate will decrease rapidly till atapproximately 19 mm.
� Once the spacer plate comes to a certain limit, which is 18mm or 19 mm, this is the time to rebuild.
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Spacer Plate Rotor Gap
35 mm 18 mm
31 mm 22 mm
27 mm 26 mm
23 mm 30 mm
19 mm 34 mm
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HOPPER
to Hammer Mill
MovableRotor
StationaryRotor
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STAGE 1
Limestone is carried by the 222.08 conveyor. There are various sizes ofLimestone coming from it , such as 20 mm, 25 mm and etc .
STAGE 2
This Limestone·s are then dropped to the Hopper .
STAGE 3
The rotor gap is only 18 mm , but some of the limestone·s are biggerIn size then the rotor gap. When the limestone·s flow to the rotor gap,What happens is the movable rotor and the stationary rotor will moveIn opposite direction.
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STAGE 4
Then, the Hydraulic Pump will pump the moveable rotor. AndThe Hydraulic Cylinder helps the moveable rotor to press the
material·s vigorously .
STAGE 5
When the material·s are pressed with a pressure of 80 ² 100 BAR , theLimestone·s crushes/grinds against the wall of the rotor .
STAGE 6
This is how the Grinding process happens .
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STAGE 7
This Grinding process helps the sizes of the limestone·s to decrease
And to flow down the rotor gap as a so called ¶cake·.
STAGE 8
This so called ¶cake· will then go to the 224.01 conveyor and then
Brought to the Hammer Mill .
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Spacer REASON ² because when thePlate moveable rotor is
pressing the spacer
Spacer plate , the spacer plate
Frame would not be misplaced
from the Spacer Frame.
Allen
Screw Note ² Allen Screw was used to Bolt the
Spacer Plate with the Spacer Frame
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Square
Bar
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1. A square bar is weld with 50 mm mild steelplate .
2. When the moveable rotor is pressing thespacer plate , the weld square bar will getweaken and results in , the square bar will fallafter some period of time eventually .
3. From this we can conclude that by welding thesquare bar with the mild steel plate, it dosen·t
last long.
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4. So to avoid this breakdown time and timeagain, we should bolt the square bar with themild steel plate.
5. We can also bolt and weld the square bar withthe mild steel plate for longer lasting purposes.
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The weld breaks
In this area
Because on this
Side it has the
Moveable rotor, At this point the weld
And when the doesn·t break because
Moveable rotor on this side , it has the
Presses the stationary rotor ,
Spacer plate which doesn·t press
Vigorously the spacer plate.
The weld getsWeaken and it
Eventually
Breaks down .
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� Welding always crack.
� Stoppage of Roller Press.
� Lost running hours.
� Lost amount of production (per hour 80-100tan)
� Waste of man power.
� Waste of equipment.� Lost hour production will be around 6 to 8
hours.
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� Last longer period of time.
� Double protection because of weld and bolt.
� If the welding cracks, the square bar will notfall because it still has been bolt with the AllenScrew.
� Less loss running hours.
� Less loss amount of production.
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From this we can conclude that :-
1) When the Spacer Frame and the Spacer Plate is bolt
with the Allen Screw , with this we can save moreamount of production .
2) Moreover , we will also have the double protectionwhen we bolt and weld . This will ensure us less
stoppages if anything goes wrong .3) During the stoppage of Roller Press , it will at least
take about 6 to 8 hours of running hours. So in thiskind of circumstances we can avoid the loss ofrunning hours .