Six axles are better than four in the metal-recycling business
With its global approach to finding a solution to metal retrieval, Albury-based IMMIX Integrated Metal Management is never short of ideas.
When looking for a perfect match for its 8×4 DAF rigids, it chose Freighter Trailers to create a six-axle skeletal trailer with tri-axled dolly that could accept two large metal-recycling bins. Each bin is secured to the trailer by front and rear bin locks mounted on the chassis rails, with the front mounts of each bin being operated pneumatically while the rear mounts on each bin are locked and unlocked manually.
With each bin sized at 6400 mm in length, the opportunity to fit two bins on a single trailer meant talking with Freighter Trailer’s engineer, Troy Kitchen, to design a suitable six-axled dog trailer.
The DAF XF105, to which the six-axled dog trailer is connected, is the first 8×4 twin-steer, hooklift to come to Australia from the DAF factory in Holland. Running under full PBS approval as a truck and dog trailer combination in the Australian market, the combination has a net weight of 45 tonnes with an overall gross weight of 68 tonnes.
A combination of this size demands the utmost selection of safety inclusions, and the DAF and its trailer certainly fit the requirement, with EBS (electronic braking systems) combining with ABS (anti-lock braking systems), adaptive cruise control, lane departure warning, side-view camera system and Xenon HID headlamps. The rear of the trailer is also fitted with a reverse monitoring camera unit.
The initial lead work in developing a suitable trailer to match the DAF 8×4 was initiated by Neville Farrugia, DAF sales manager at Twin City Truck Centre of Wodonga.
“As one of the first of its kind to operate in the Australian market, the six-axled, extended-length Freighter dog trailer features a lift-up axle on each tri-axle set (leading axle and trailing axle) enabling the trailer to carry the two six-metre skip bins,” said Neville.
“We worked very closely with IMMIX to form the initial design that was then referred through NHVR for PBS approval. The result was really a combination of the joint effort put into the project by Ivan Tarrant, the resident engineer at MaxiTRANS, working with Sue McKenzie of NHVR and with certification for PBS organised by Mario La Rocca.
“The project to create a six-axled trailer that ideally suited the requirements of IMMIX brought together an immense amount of data that had to be collated into the design prior to gaining PBS approval. I can’t speak highly enough about the help we received through Sue McKenzie of NHVR and all the other members of the team involved in bringing the project to a conclusion,” said Neville.
The detailed design of the six-axled Freighter trailer included the use of CS9 suspension with 10/285 iron hubs with a hub odometer, cast drums and automatic slack adjusters.
The CS axle and suspension is suitable for a wide range of applications, with ride heights ranging from 175 mm through to 525 mm. Available in tapered bearing or parallel bearing configurations, and with either disc or drum brake fitments, the CS9 units are imported into Australia and assembled by MaxiPARTS.
With its 24-volt multivolt electrical system, the new trailer features an electronic braking system by WABCO, which also supplied the Duomatic couplings. The LED lighting system is by Hella.
The coupling between the trailer and the DAF 8×4 hooklift is facilitated by the mounting of a single airbag that operates on the rearmost cross member of the drawbar located in front of the hinge, from its mounting on the front of the trailer dolly assembly. This raises and lowers the drawbar pneumatically, preventing the need for manual intervention.
As Ivan Tarrant of MaxiTRANS explained to TrailerTorque, the overall trailer design had to facilitate easy loading of the front bin onto the forward section of the trailer.
“The sides of the drawbar are actually cranked rather than straight, and with the trailer detached the airbag deflates to lower the drawbar assembly so that it rests flat on the ground. In this position, the drawbar does not impact on the ability of the DAF 8×4 truck that hauls the trailer to reverse over the drawbar up to the front of the trailer to load and unload the forward bin,” said Ivan.
“When that exercise has been completed, the truck pulls forward and the drawbar is then raised by the airbag, enabling the truck to reconnect to the trailer through a standard Ringfeder coupling,” he added.