Lokotrack ST352 Advantages vs' Powerscreen 1400

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Lokotrack ST352Advantages vs.Powerscreen 1400
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Lokotrack ST352vs.Powerscreen 1400
AUTHOR Stephen Whyte LOCATION Metso Minerals
(Cappagh) 55 Cappagh Road Galbally,
Dungannon Co. Tyrone N. Ireland, UK BT70
2PE MOBILE [phone] OFFICE 44288775
8396 FAX [phone] E_mail stephen.whyte_at_me
tso.com DATE OF ORIGINAL REPORT July 2005 LAST
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NOTE This document contains information that may
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and true at the time of print. CONFIDENTIALITY
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ST 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.
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Hopper 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)

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Belt 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

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Main 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

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Screen

• 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.)

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Screen

• 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

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Side 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

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Product 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

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Engine / 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

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Engine / 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

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Control 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)