The DX235RTF-7 is based on the established DX235LCR-7 reduced radius crawler excavator from  Develon (formerly called Doosan Construction Equipment) and is powered by a DL06V Stage V engine, providing 141 kW (189 HP) of power.

The DX235RTF-7 uses the compact design and minimum swing radius of the DX235LCR-7, but the key part of the machine is the heavy-duty tunnelling front, with a new arm and boom design with special kinematics and a tilting function.

Jan Breburda, special applications product manager for Develon Europe, explains: “The new DX235RTF-7 tunnelling machine is designed for superior performance in challenging underground environments. Complementing the safety and comfort of its operation, the advanced hydraulics and robust construction of the DX235RTF-7 ensure optimal power and durability, while its compact design allows for easy navigation in tight spaces.”

The DX235RTF-7 has a total operating weight of 25,689 kg and offers a maximum reach of 9260 mm. The kinematics of the tunnelling front are designed to prioritise horizontal reach and precision over vertical movement. The special kinematics are based around a boom tilting function, providing a 45°/45° tilt in two directions, the movement of is operated via a pedal in the operator’s cab.

The boom and arm configuration is specifically designed for operation in narrow areas, with ranges of movement slightly limited compared to the standard front on the DX235LCR-7. The DX235RTF-7 is specifically suited to work in restricted environments, without using the swing movement in narrow areas. This allows it to work efficiently in narrow tunnels with the ability to reach the tunnel face and walls, while maintaining a low profile to navigate tight spaces, Develon says.

For work in confined spaces, the DX235RTF-7 has protective equipment to safeguard against falling debris or contact of the arm with the tunnel ceiling and walls. As a result, the DX235RTF-7 has a level 2 FOG system combined with more heavy duty covers and hydraulic piping protection. The protection also includes covers over hydraulic hoses and arm work lights, as well as enclosing the bucket cylinder and links in a dedicated protective compartment and hiding the arm cylinder under the arm.

It has six LED work lights – four on the front and two on the back – as well as AVM cameras as standard. Other features include PERO rotating piping, centralised greasing points and a dozer blade as an option. The specifications also include a 6.4-tonne counterweight and 600 mm wide triple grouser track shoes.

 

Specifications for DX235RTF-7 tunnelling excavator

• Operating weight: 25,689 kg
• Overall height (boom hose): 3840 mm
• Overall height (cab – lowered): 3080 mm
• Overall height (hand/guard rail): 3390 mm
• Overall width (shipping): 2990 mm
• Rear swing radius: 1680 mm
• Track shoes width: 600 mm