lq - tilting low loader - loadquip - tilting low loader.pdf · 3.0 mechanical 3.1 hydraulics and...
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1.0 GENERAL DESCRIPTION
The 115t Tilting Low Loader is a rear-loading heavy equipment low loader.The rear loading is achieved by inclining the rear deck to form a 7 degreeramp for the loading of equipment. The inclination of the deck is via ahydraulic cylinder operating a parallelogram link tow hitch. For loading andunloading the tilting motion is controlled via either a remote control unit or apendant controller. Either control unit allows the operator to control the unitfrom a safe location.
The towing vehicle shown in this case is a Caterpillar 785 mining truck. A Cat777 or other truck could also be used depending on the site conditions. Thecomplete loading process can be a one man operation taking less than 5minutes, and with no need for any ramp other than that formed by thestructure.
115t TILTING LOW LOADER
T 07 3839 2349
F 07 3832 3491
www.loadquip.com.au
PO BOX 247, SPRING HILL,
BRISBANE, Q. 4004
2ND FLOOR,
457 EDWARD ST
115t TILTING LOW LOADER SPECIFICATIONS
Model TL-115
Manufacture Date SEP 2011
Rated Capacity 115 tonne
Prime Mover Caterpillar 785 (modified for haulage) 1
Prime Mover Tyres 33R51
Trailer Hubs Caterpillar 777F
Trailer Tyres 27R49
Braking System Caterpillar Oil Cooled
Overall Length 23.4 m
Width across tyres 9.7 m (6.7m across prime mover tyres)
Max Speed (unloaded) 55 kph
Max Speed (loaded) 2 15 kph
Max Ramp Slope 12.3% (Gross)
Max Tyre Pressure Required 116 psi
Typical Loading Cycle 5 minutes (estimate)
1. the low loader can be adapted to other tow vehicles.2. max speed automatically reduced based on load, can be configured to
site requirements.
T 07 3839 2349
F 07 3832 3491
www.loadquip.com.au
PO BOX 247, SPRING HILL,
BRISBANE, Q. 4004
2ND FLOOR,
457 EDWARD ST
2.0 MACHINE CAPABILITIES
2.1 Performance
With a 115 tonne payload the low loader has sufficient rimpull to climb a12.3% grade at 9 kph, which is in first gear and out of torque converter mode.In torque converter mode the grade climbing limit is considerably higher. Theactual gradability depends on the traction and rear axle load.
The traction capability of the prime mover can be enhanced with the additionof weight to the prime mover rear axle. This is achieved by mounting a steelor concrete weight on the prime mover chassis rails. The retro-fitment of sucha weight is a relatively simple exercise should it be required.
2.2 Braking System
The 115t Tilting Low Loader uses standard oil-cooled Caterpillar truck brakes.
The combined mass of the prime-mover, trailer and payload is comparablewith the mass of a fully-loaded dump truck. Thus the brake oil-cooling systemis capable of handling the heat dissipation of descending ramps at similarspeeds to a dump truck. The trailer brakes are cooled by running rear-brake-cooling oil to the trailer brakes before it is returned and passes through theprime mover rear brakes.
This method is similar to that used in the CMP Engineers designed KD 160Coal Haulers used at various Queensland coal mines. In the case of thatvehicle the prime mover is the smaller CAT 776 prime mover.
T 07 3839 2349
F 07 3832 3491
www.loadquip.com.au
PO BOX 247, SPRING HILL,
BRISBANE, Q. 4004
2ND FLOOR,
457 EDWARD ST
With regard to performance, the limitation on downhill speed is the rate thatheat may be dissipated in the oil coolers on the prime mover. The gradecalculations are based on this rate, as well as a conservatively low retardingrolling resistance of only 0.5%1. The braking configuration has sufficient heatdissipation capacity for a 1.5km long 10% grade.
The basic bias between the trailer brakes and prime mover brakes is set to afixed proportion depending on whether the trailer is loaded or unloaded. Inaddition a retard lever is provided that allows additional trailer braking to beapplied on demand.
2.3 Payload Items
The following pages show the travel and loading configuration of the lowloader, along with an example of a payload item loading and loaded on thelow loader. Also shown, is the low loader negotiating transitions to uphill anddownhill 10% grades, noting that adequate clearance is achieved even with azero radius between the flat and the slope.
1Note that it is conservative to use a 1.5% rolling resistance for towing situations, and only
0.5% rolling resistance when retarding
T 07 3839 2349
F 07 3832 3491
www.loadquip.com.au
PO BOX 247, SPRING HILL,
BRISBANE, Q. 4004
2ND FLOOR,
457 EDWARD ST
3.0 MECHANICAL
3.1 Hydraulics and Controls
The low loader uses industry-standard hydraulic components, fittings andhoses in a conservative design for a long period of trouble-free operation.Extensive use is made of filters, relief valves and limit switches to protect thesystem.
The primary means of operation will be via a simple 3 button remote controlunit, comprising a deadman's switch and Up and Down buttons. The tiltingfunction operates at a single slow speed. An alternate control pendant isincluded.
Power for the tilt cylinder comes from the existing hoist pump on the primemover.
3.2 Lubrication
Grease lubrication will be required at several points on the parallelogram linktowing hitch, these points will linked into the existing truck lubrication system.
3.3 Ramp
The 115t Tilting Low Loader has a flat deck top that tilts to form the loadingramp. As shown in included drawings the ramp angle is easily negotiated byall of the nominated payload items.
The first one meter of the deck/ramp is steel and the balance is timber. Theimage above shows the low loader in the load configuration with a D10 beingloaded.
T 07 3839 2349
F 07 3832 3491
www.loadquip.com.au
PO BOX 247, SPRING HILL,
BRISBANE, Q. 4004
2ND FLOOR,
457 EDWARD ST
3.4 Access Systems
The top of the deck is approximately 770mm above the ground. A shortladder can be installed at the front of the trailer to provide access to the deck.
3.5 Design Life
The load cycle spectrum for a vehicle of this type, which is infrequent loadingto its rated capacity, dictates that maximum load events dominate the designcriteria and not high cycle fatigue. This contrasts with a coal hauler forexample, which is typically loaded to its rated capacity on every cycle.
As accumulation of “fatigue damage” is relatively slow, the float life is highlylikely to be far in excess of 50,000 hours, as shown by a consideration offatigue issues.
It should be noted, as a testament to CMP Engineers’ experience in this area,that using the same design techniques, many of the CMP Engineers designed220 tonne coal haulers have now achieved in excess of 80,000 hours service.
On the basis of this slow accumulation of fatigue damage an operational life of20 years in expected. CMP Engineers previously designed a similar lowloader for Nabalco which has now been in operation for in excess of 15 years.
4.0 ELECTRICAL
The spot and work lighting, brake, turn and reversing lights, as well as thereversing alarm, are all directly wired to the prime mover using harnesses andterminal boxes all constructed to appropriate mine site standards.
T 07 3839 2349
F 07 3832 3491
www.loadquip.com.au
PO BOX 247, SPRING HILL,
BRISBANE, Q. 4004
2ND FLOOR,
457 EDWARD ST
5.0 SAFETY
During unloaded operation the low loader is able to travel at the normaloperating speed of the prime mover. During loaded operation, sensed via aload cell on the trailer frame, the higher prime mover gears will be locked outto limit the speed of the machine. This not only ensures the unit continues tooperate within its tonnes-kph (TKPH) rating for the tyres, it is a safetyenhancement, to ensure that speeds are kept to a safe level when themachine is loaded.
Safe braking is ensured as the machine is designed to comply withinternational braking standard ISO 3450. This allows proper, safe retardationwhen descending ramps, as well as ensuring safe braking in emergencysituations. Also, we use oil rather than air in the long brake actuation lines onthe trailer, so brake activation is more rapid and therefore more controlled.
As a general comment, the safety of moving large items of equipment arounda minesite is enhanced if the mass of the prime mover is a significantproportion of the overall tare weight. In this respect, the choice of the Cat 785rather than the Cat 777 helps in this regard, but it is difficult to quantify thisbenefit from a safety viewpoint.
T 07 3839 2349
F 07 3832 3491
www.loadquip.com.au
PO BOX 247, SPRING HILL,
BRISBANE, Q. 4004
2ND FLOOR,
457 EDWARD ST
