Title: Lokotrack ST352 Advantages vs' Powerscreen 1400
1Lokotrack ST352Advantages vs.Powerscreen 1400
2Lokotrack ST352vs.Powerscreen 1400
AUTHOR Stephen Whyte LOCATION Metso Minerals
(Cappagh) 55 Cappagh Road Galbally,
Dungannon Co. Tyrone N. Ireland, UK BT70
2PE MOBILE 447919596727 OFFICE 44288775
8396 FAX 44288775 8557 E_mail stephen.whyte_at_me
tso.com DATE OF ORIGINAL REPORT July 2005 LAST
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3ST LT Combinations
- ST352
- Has the ability to work in closed and open
circuit with our LT range, eg. LT1213, LT1110,
LT105, LT200HP - LTST with jaw crushers
- LTST with impact crushers
- LTST with cone crushers
- Powerscreen 1400
- Will not work closed circuit with LTs
- Crusher has to be raised to work open circuit
Crusher has to be raised (0,5m) -gt Difficult.
More set up time.
4Hopper Tipping grid
- Advantages of ST352
- 14 Ft Grid as standard
- Larger range of openings available 456
- Rubber seal between grid and grid hopper
- Lower loading height
- ST352 3m
- 1400 3,5m
- Larger loading width and length
- Easier to load
- Individual grid bars or cassettes can be removed
or replaced
- Advantages of 1400
- When they fit the 14ft hopper they can offer
either - a 12ft grid with A crusher feedbox (standard)
- or a 14ft grid (optional)
5Belt feeder Hopper outlet
- Advantages of ST352
- Larger hopper opening -gt Less chance of material
bridging - Wider belt speed range -gt More capacity
- Optional clam shell door can be fitted for sand
applications - Better sealing against spillage between feeder
and main conveyor due to the tail section of the
main conveyor being fixed in position -gt Less
spillage - Via SmartScreentm
- Starts in proper sequence, no operator knowledge
required - Self adjusting feed rate, no operator required
- Optimum feed rate for all applications
- Automatically slow down \ stop if screen is
overloaded - Automatically slow down \ stop if main conveyor
is overloaded - Automatically slow down \ stop if product
conveyors are overloaded - Automatically stop if a stone catches up and
stalls the main or product conveyors - If hydraulic oil temp gets to high the feed
conveyor will automatically slow down until the
oil cools, then return to full speed - More capacity, more accurate product
6Main Conveyor
- Advantages of ST352
- Stronger frame construction
- Low working angle 21-24 deg with screen at 35 deg
no material rollback - Rubber seal along full length of screenbox
- Rubber seal around the head section and spreader
plate - Stronger hinge powerscreen conveyor tends to
sag at the hinge point - Adjustable spreader plate distributes material
evenly over the width of the screenbox - Easy access for inspection or maintenance of
rollers - Via SmartScreentm
- Will transfer correct amount of material to
screen to maintain max efficiency and bed depth - Will vary the speed of the feed conveyor to
maintain maximum throughput - Will start in proper sequence
7Screen
- Advantages of 352
- Larger screen area 120 sq ft vs 98 sq ft of the
1400-gt20 more capacity - 2 bearing screen less maintenance, less
transmitted vibration - More amplitude (ST352 8mm vs. 1400 5mm)
- All 4 mesh panels are the same size and
interchangeable-gtMeshes can be rotated. Even at
top deck. - Sealing strips fitted no contamination on fine
materials - High side plates eliminates spillage over the
sides of the screen - Impact box eliminates damage to the fist
section of screen and helps spread material
before it reaches the mesh, more throughput. - High quality SKF bearings used
- More clearance between decks
- Steeper angle on top deck chute helps prevents
material sticking - Various types of top deck chute liners available
- Possibility to deflect oversize and middle
product onto one side conveyor - Catwalks are easier to fold one operator
required - Advantages of 1400
- Full catwalks fitted as standard(But difficult
to fold to working position.Box section
structure.)
8Screen
- Via SmartScreentm
- Screenbox will work at maximum capacity during
operation - Smooth start-up from 0 to working rpm
- ST352 can hold the amplitude and speed constant
on a 2 bearing screen, similar to a 4 bearing-gt
More capacity, more accurate product - Ability to control the feed rate based on the
screen speed - Screen will start in the correct sequence
- ST352 can change the running direction of the
screen by changing a single parameter - sometimes this is necessary for sticky material
and low capacity accurate screening
9Side Product Conveyors
- Advantages of 352
- Longer conveyor-gt Increased stockpile
capacity-gt Ability to go closed circuit (example
LT200HPST352) - Patented design - ability to lower the mid and
head section to a horizontal position for
maintenance - Ability to move the mid and head section
independently on the 1400 the head section and
the mid section fold together which causes
problem trying to locate the transport bracket - Tapered sides on the side conveyor feedboots
provides a wide and unrestricted opening to help
eliminate blockage the 1400 has vertical sides - Feedboot side spillage extensions remain fixed
for transport on the 1400 they have to be
removed. - Quality SKF bearings on all conveyors
- Variable speed on both side conveyors-gt
Eliminates spillage and roll back - Via SmartScreentm
- Automatically slow down \ stop the feed conveyor
if product conveyors are overloaded - Automatically stop the feed conveyor if a stone
catches up and stalls the product conveyors - Will start in the proper sequence
10Product Conveyor
ST352
1400
- Advantages of 352
- Product conveyor and screen move together
linked through and adjustable trestle allows
quicker set up on site. - Rubber skirting between subframe and product
conveyor remains in position at all times due to
hinge point position. - On 1400 the product conveyor and subframe move
independently, slower to set up into the working
position and the rubber skirting needs to be
fixed in position each time there is a large
change in screen working angle. - Because of the trestle system on the ST352, the
product conveyor can be detached from the
subframe to give maximum access to the btm. deck
of the screen, for mesh change and belt
replacement. - Quality components (SKF, Danfoss) -gt Reliability,
lifetime, performance, less downtime - All rollers are coated heavy duty sealer
arrangement-gt Less damage due to moisture and
dirt while stored in transport position - Via SmartScreentm
- Automatically slow down \ stop the feed conveyor
if overloaded - Automatically stop the feed conveyor if a stone
catches up and stalls the conveyor - Will start in the proper sequence
11Engine / Transmission / (Powerpack)
ST352
1400
- Engine
- BF4M2012 engine with full (EMR) electronic
control. - Gives the ability to maintain a constant speed
- Ability to work on desired torque curve
- Engine diagnostics
- Common engine with other models (ST171, ST348)
less spares etc, common filters - More efficient than version with mechanical
governor - Powerpack enclosure
- Rubbers seals used around engine air intake and
top covers to prevent ingress of dust - Covers can be removed in sections to give more
access to the top of the engine - Easy access to batteries
- In 1400 access to batteries is very poor
- Easy access to fuel and oil filter and other
serviceable components - Engine can be easily removed from the front if
required - High quality metal diesel tank
- High quality hydraulic components
- Rexroth Pump single
- vs. David Brown triple pump
- Danfoss motors and valves
12Engine / Transmission / (Powerpack)
ST352
1400
- Hydraulic System
- By using a variable displacement pump in
conjunction with Danfoss valves we have the
ability to vary the speed and start up sequence
on components as required. - This also provides (gives us allot) more
flexibility on site to solve issues with
difficult applications. - Powerscreen 1400
- The engine has a mechanical governor and the
speed has to be manually controlled. - Engine speed will drop as the process load
increases-gt big drop in power - All manual valves
- Gear pumps will be less efficient especially when
the hydraulic oil heats - As the hydraulic oil heats the speed on the
screen will drop causing the screen to go out of
balance - Poor access to batteries
- Poor access for servicing
- Main conveyor would have to be removed prior to
an engine removal - Service side of the engine is difficult to access
- Control centre is very basic oil pressure light
and hour meter
13Control system
ST352
1400
- IC300 PLC System
- One button to start and stop the process
- Complete control of the screening process to
maintain maximum capacity Input through a
series of speed and pressure sensors - The SmartScreentmsystem will vary the process
based on a series of inputs from the machine, for
example, - 1 Load on the screen and screen speed it will
maintain correct bed depth on screen at all times - 2 Load on the main conveyor
- 3 Load on the product conveyors
- 4 Hydraulic oil temp
- Ability to link the ST control system to that of
an LT, or another ST as a primary or secondary
unit. More than 2 units can also be linked
together. - Reduction in labourforce do to automated process
- System errors displayed on screen easier to
diagnose a problem on site - Ability to store a set of parameters based on an
application - Program can be updated to make use of new
additional features - Four pre-set programs for different materials
(e.g. rock / sand / gravel / factory parameters)