Trencher goes in front of the machine
A
Hagglunds Drives product story
Edited by the Engineeringtalk editorial team
Jun 7, 2007
The positioning of Mastenbroek's Hard-Rock Trencher means that the weight of machine is no longer so important in relation to the size of trench.
Mastenbroek has released the Hard-Rock Trencher (HRT ),which performs the trenching at the front rather than trailing behind the machine.
The geometry of this new arrangement means that the weight of machine is no longer so important in relation to the size of trench, making trenching more efficient with smaller machines which use less fuel.
Hagglunds' Compact CA140 motor was chosen to replace the crankshaft type hydraulic motors to drive the trencher's cutter.
The cutting head, which is designed within a dynamic boom arrangement, consists of the front drive sprocket of an endless chain, fitted with picks, sandwiched between two side cutters that also have picks.
The boom, once the initial cut is made, cuts from bottom to the top with spoil carried like a conveyor by the endless chain up through the centre of the machine and deposited at the side of the trench.
During the original discussions with Mastenbroek, one of the main requirements identified was to have the ability to operate in extremes of climate both hot and cold.
Hagglunds spent some time validating this in its laboratory in Sweden.
It also compared the results with tests on traditional crank case type motors often used on mobile equipment.
The company found found that the Compact motors were very suitable for use in these applications in extreme climates.
The size and weight of the motors was far lower than the competition and this is always an important issue on mobile equipment.
Due to the very high overall efficiency of the Compact motor much less heat build up was found in the hydraulic system.
Less heat build up means a lower system operating temperature, resulting in higher fluid viscosity and therefore improved performance and life for the entire system.
The 98% torque efficiency of the Compact also improves the actual force available at the picks, improving basic cutting performance and reducing fuel consumption.
The Compact motors are ideal for tough drive applications due to the design of the piston roller assemblies and the cam ring profile.
The whole motor is insensitive to shock loads and vibration.
It is also insensitive to the thermal shocks because there is no need for a pintle valve.
The HRT-25 will produce trench depths up to 2.5m and 0.65m wide.
Future models will include the HRT-45, HRT-55 and HRT-85 with digging depths of 5m and widths up to 2m.
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