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Rotators are probably the most useful and versatile of positioning equipment for
a Fabrication shop. “AMIN” manufactures a wide range
of machines which comprise basically the following: |
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1. Conventional Rotators :- |
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These comprise basically two sets of rollers which are adjustable either manually
across the frames or through lead-screw and ratchet, when changing from one diameter
to another.
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2. Self-Aligning Rotators:- |
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The Rollers of these machines automatically adjust themselves when loading to suit
the diameter of vessel. Thus a large range of diameters can be accommodated without
need for any adjustment whatsoever. |
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The “AMIN” CR. Type Conventional Rotators and the SAR type Self Aligning Rotators
can be supplied for variable speed rotation. |
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CONVENTIONAL ROTATORS :-. |
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These machines are built in capacities from 1 tonnes to 2000 tonnes. The frame is
of robust fabricated construction and is machined on the top and underneath to ensure
perfect alignment. Both the drive and the idler frames are provided with robust
fabricated carriages which support the axles and bearings of the rubber / polyurethane
or steel rollers.
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In the case of the AMIN type 2\CR machines, built in capacities from 1 to 25 tonnes,
the rollers are moved across the frames manually and bolted in the required position.
Type 3\CR. Machines 30 tonnes capacity and upwards are provided with lead-screws
so that the roller brackets can be moved across the frame through a ratchet. |
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According to capacity the Rotators are provided with all rubber tyres, or Polyurethane
tyres and separate all steel
overload wheels, or can be of course be supplied with cast steel wheels.
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The Rotator base fabrication, or chassis, is designed and fabricated to carry the
weight of the vessel and incorporates a contingency for shock loading. It is important
that the design eliminates any distortion which can lead to misalignment of the
rollers. The drive section comes under the biggest strain when the vessel is being
loaded. It is physically impossible for a crane operator to position the vessel
so that it contacts with both sets of rollers at the same time. If the
work-piece one roller before being supported on all the rollers, the first
roller will receive a full shock load which puts a considerable force on to the
drive. We have endeavored to incorporate a good overload margin to absorb this shock
load.
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SELF ALIGNING ROTATORS :-
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The design of the AMIN Self-aligning Rotators incorporates many hidden features,
which are unknown to our competitors.
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With the AMIN Self-aligning construction the trunnion brackets which support the
rubber typed wheels automatically align themselves when changing from one diameter
to another, no manual adjustment whatsoever is required. |
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Each section supports the vessel on four points ensuring better traction, and on
machines of 10 tonnes capacity and upwards all four wheels of the drive section
are positively driven. This four point suspension is an added advantage when on
handling thin walled vessels. |
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The two top leading wheels of the drive section incorporate clutches which are loosened
prior to loading the vessel and the top wheels can rotate freely when the
vessel is loaded; thus regardless of weight if the vessel is lowered centrally
between the frames, or firstly on to one wheel only, no damage can be sustained
by the transmission. |
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One problem in the welding of large diameter heavy vessels is the lining up of the
strakes. To facilitate this problem of lining up, the AMIN Self-Aligning Rotators
can be supplied with an arrangement whereby the trunnion brackets which support
the rubber typed wheels can be moved across the frame by lead screw so that the
vessel can raised or lowered by widening the trunnion centers or bring them closer
together and in addition a secondary screw adjustment can be provided to move both
the trunnion brackets either side of the center line approximately 38 mm. |
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In order to ensure that the four wheel point support can be maintained over an extended
range of diameters the SAR. Frames can be supplied so that a spacer can be inserted
in the main frame between the trunnion centres so that they are capable of handling
vessels upto 11 metres or more in diameter.
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SUPPORTING ROLLS :-
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Both the CR. Conventional and SAR Self-Aligning Rotators can be provided with either
all rubber tyres or rubber tyres with separate steel overload wheels, or polyurethane
tyres, or where the vessel is preheated steel wheels. |
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Problems frequently arise where vessels can only be supported over a narrow area
due to projecting stubs or pipes, and where steel wheels are not desired polyurethane
tyres can be used which have double the supporting capacity of rubber with half
the width. |
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The steel overload wheels and all steel wheel which AMIN supply are cast steels,
manufactured to BS 592 grade “C” with a surface hardness of 20-22 Rockwell. Many
of our competitors use steel wheel which are fabricated and which only have a very
short term life. |
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The rubber tyres or polyurethane tyres fitted to AMIN Rotators can be easily interchanged
if damage is sustained through burning or for other reasons. (It is understood that
both rubber and polyurethane tyres will only withstand temperatures of approximately
85 deg. C) |
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TRAVERSING ROTATORS:-
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The CR and SAR Rotators can both be supplied with traverse wheels incorporated in
the design of the machine frame; this arrangement eliminates the necessity of using
a separate traversing bogie and reduces the overall loading height. The traversing
rolls are of cast steel and can be either single flanged and two plain wheels. In
the latter case it is primarily only necessary for one of the track rails to be
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