LFA Tablet Presses VH Series User manual

VH POWDER MIXER
USER MANUAL
LFA Tablet Presses is a trading name of
LFA Machines Oxford LTD
All of the content in this document is covered by copyright ©

CONTENTS
Page 1. Introduction
Page 1. Technical Specications
Page 2. Operation
Page 2. Filling The Powder Mixer
Page 2. Emptying The Powder Mixer
Page 2. Starting and Stopping The Mixer
Page 2. Reversing The Direction
Page 4. Maintenance & Lubrication
LFA Machines Oxford LTD ©

LFA Machines Oxford LTD ©
Introduction
The VH Series Powder Mixers are a series of versatile and reliable semi-automatic mixing ma-
chines for combining dry powdered and granular materials. Available in sizes ranging from the 8
litre V8 up to the 500 litre V500, these powder mixers are suitable for the pharmaceutical, chem-
ical and food industries, animal fodder production, as well as ceramics and metallurgy, and any
application that requires the thorough combining of two or more dry powders or granules.
All the VH Series Powder Mixers share the same design principles, oering asymmetric mixing
tubes that are agitated and rotated to achieve highly ecient mixing of their contents, without
leaving dead spots or uncombined powder. These mixers have been solidly engineered with rug-
ged industrial motors and durable stainless steel tubes, to give many years of productive service.
They are simple to operate and to maintain, and their stainless steel tubes’interiors are polished
to a smooth nish that ensures easy and eective cleaning.
Please read this manual carefully before starting to use your VH Series Powder Mixer.
Technical Specications
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CAUTION.
Please read these operating instructions carefully before installation,
starting up and repair. Inappropriate operation not recommended in
the instructions may damage the machine or cause personal injury.
Model Barrel capaci-
ty(L)
Material
weight (kg)
(apprx.)
Agitation
speed (r/min
Mix time (min) Motor power
(kw)
VH8 8 2.5 24 8 0.25
VH14 14 4 46 8 0.37
VH100 100 28 15 8 1.1
VH150 150 42 15 8 1.1
VH200 200 56 12 8 1.5
VH300 300 80 12 10 1.5
VH500 500 140 12 10 2.2

FILLING THE POWDER MIXER
Use the inching button to position the Powder Mixer upright, and open one of the top lling
ports to ll the machine. Some larger models in the range have a vacuum lling option, or the
machine can be lled manually.
Close and secure the lling port tightly to ensure a watertight and airtight seal.
EMPTYING THE POWDER MIXER
The Powder Mixers’simple release system uses a metal stopper and rubber valves to form a
secure, airtight and watertight seal during operation. When mixing is completed, use the inching
button to position the exit port over a suitable container and loosen the wing nut that holds the
stopper in place. Then remove the stopper to allow the contents to empty.
STARTING AND STOPPING THE MIXER
The VH Series Powder Mixers are operated by the simple button controls located on the front of
the main body of each machine. As well as a green‘start’ button and red ‘stop’ button for manual
operation, there is also a yellow ‘inching’ button that makes it easy to bring the mixing tubes into
an easy position for lling and emptying. If automatic operation is preferred, there is a digital tim-
er that lets the operator pre-programme how long the mixer should run for before automatically
switching o.
For the larger machines in the range, there is also a manual override button that allows for contin-
uous rather than time operation.
REVERSING DIRECTION
From the VH100 upwards, the powder mixers are equipped for both clockwise and counter clock-
wise rotation, allowing for a better mix.
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Operation

Maintenance & Lubrication
The VH Series are robust machines that require minimal maintenance. To ensure their long term
utility they must be kept clean and well lubricated, paying particular attention to the bearings and
gearbox. Any damaged or worn parts must be replaced immediately.
The motor should be carefully inspected according to a regular schedule, and lubrication applied
as required.
Prevent powder building up around the seals on the lling and emptying ports by thorough
cleaning after each use.
The polished stainless steel tubes allow for ecient cleaning. To avoid cross contamination be-
tween batches, the tubes should be thoroughly cleaned and dried before relling the machine.
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