Diaphragm suggestion.ppt

8/14/2019 Diaphragm suggestion.ppt

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Comparison

Textpresent diaphragmTextVega diaprhagm

Following pages will have a comparison between

existing and Vega diaphragm. The template of

comparison is given here

Existing diaphragm photo Vega diaphragm photo


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Comparison 1Material transport from 1stchamber

In present diaphragm, material

transport from the gaps between

wear plates which is quit often

blocked by grinding media asshown in the picture.

In Vega diaphragm Proper placing

of lifters and grooving on the

outer grate plates make sure that

there is minimum blockage andflarring.


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Comparison 2False transport from diaphragm

In present diaphragm the wear

plates have flat fitting edge whichcan be opened in operation and act

as fault transport point

In Vega diaphragm wear plates are

assembled with overlapping. Withthis arrangement, fault transport is

totally avoided.


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Comparison 3Flexibility of structure

In present diaphragm two plates areassembled together with common

structure segment. This drastically reduce

the flexibility of structure which results in

frequent breakage on structure and also

damage the screen and hardware as well

as wear plate itself.

In Vega diaphragm each wearplates is assembled on separate

structure segment which does not

have any physical connection with

adjacent structure. This ensure

sufficient flexibility on whole

assembly.

Rigid structure Flexible structure


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Comparison 4material transport from diaphragm

There is no control over the flow ofmaterial from first chamber to second

chamber in present diaphragm. Wide

opening on structure for material transport

makes this diaphragm totally useless.

Vega diaphragm is supplied withunique installation of cylindrical

lifter which regulates flow from

first chamber to second chamber

by very simple mechanism.


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Comparison 5Central screen

In present diaphragm, the central screenis with smaller opening which increases

resistance of air transport. This diaphragm

is not suitable for higher air velocity in

the mill. For high temperature feed, part

of cooling is generally done with higher

air speed in the mill.

Vega diaphragm is supplied withwide central screen opening which

allow efficient air flow through

diaphragm. It is proven that the

pressure loss with Vega

diaphragm is minimum.


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Comparison 6Self cleaning of slots

In present diaphragm, the big gapsbetween wear plates are normally

chocked with balls which further

deteriorate the material transport from

first chamber and also damage the

structure and screen.

Vega diaphragm is supplied with groovesto continuously clean the slots while in

working. This provides un-interrupted

passage from first chamber to diaphragm

strucutre.


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Think Again.

Is your diaphragm made

for your specificrequirement ?


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Vega Design Level Control Diaphragm

Function of diaphragm.

Process advantage.

Maintenance advantage.

Grate plate advantage


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LEVEL CONTROL DIAPHRAGM - FUNCTION

To keep the material level in the

1st chamber at an optimum level.

The material entering the

diaphragm chamber through the

slotted grates exits into the

second chamber only through the

rotating cylindrical lifters.


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LEVEL CONTROL DIAPHRAGM

CYLINDRICAL LIFTERS

These lifters can be easily adjusted by turning them on their axis.

Q (Lifter output/mill through put) = S (Effective c/s area) x h (Effective

material height in the lifter)= constant


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LEVEL CONTROL DIAPHRAGM -

PROCESS ADVANTAGES

Optimum retention time of the material in 1st chamber

leading to optimum crushing efficiency

Possibility of using a coarse ball charge in the 1st

chamber without risk of resultant lack of material

Reduced pressure drop due to large and circular central

screen

Central screen design empowers it to self clean during mill

operation

Correct material level also ensures ideal working

conditions for the grinding media

Slot size is designed as per the feed material

characteristics and to ensure optimum air flow through the

diaphragm


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Flexible structure absorbs dynamic deformation of the

mill

Ability of the frame structure to withstand axial

pressures of the ball charge

No leakage of material & grinding media from one chamber

to another due to overlapping design

No cutting/welding of he frame structure segments at the

site

The frame structure segments, grate plates and back

plates are designed for easy handling and for minimiseinstallation time

The central screen has a door, which facilitates movement

of any person from 1st chamber to the 2nd chamber. Down

time is reduced for routine mill inspection as the

manhole of the 2nd chamber is not required to be opened.

LEVEL CONTROL DIAPHRAGM

MAINTENANCE ADVANTAGES


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Thank you

Diaphragm suggestion.ppt

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