Dragon

Dragon is a compact and versatile shotcrete rig for underground work. It is practical and easy to use, and according to the manufacturer it is the solution for tunnels and adits with small and medium cross-sections. The machine is designed for heavy-duty operating conditions and withstands high loads over time. The concrete is fed by a twin piston pump with a theoretical capacity of 15 m³/h. The pump cylinders are Ø 120 mm with a 700 mm stroke length, max. 30 strokes, and the maximum pressure on the material is 80 bar. The rig is operated with a proportional remote control that can be used both wirelessly and with a cable.

Spraying boom and hoses

The spraying boom is telescopic and made up of four high-strength steel box girders with a protective cover and guide bushes for smooth movement. The maximum spraying reach is 8.9 metres vertically and 7.1 metres horizontally, minimum 2.5 and 2.4 metres. The nozzle rotates 360° and can be tilted 240°, has automatic brushing movement and is easy to clean. At the front are hydraulic outriggers with axle protection. The material hose is a high-pressure rubber hose of Ø 65 mm, and the rig has separate high-quality hoses for air and chemicals.

Accelerator dosing

The accelerator dosing pump is a hydraulically driven screw pump that provides pulsation-free dosing. The rotor is made of stainless steel to avoid corrosion, and the pump has dry-running protection. It is suitable for all types of accelerator, including alkali-free ones. The tank holds 600 litres and can be increased to 1 000 litres on request, and it is easy to fill and replace. The dosing is synchronised with the concrete flow. The max. dosing rate is 16 l/min. The water tank holds 200 litres.

Undercarriage and operator's station

The undercarriage is a heavy-duty chassis made for the toughest conditions in mines and tunnelling. Both front and rear axles are load-bearing and steering, with planetary gears in the wheel hubs, and the rear axle oscillates. The rig has four-wheel drive and four-wheel steering with crab steering, power steering and hydrostatic transmission with mechanical gearbox. The tyres are 12.0/75-18" P.R. 12 TR3. The operator's station is an open FOPS cab in which the operator's seat swivels 180°, giving a high seating position and good visibility. The working lights consist of two 500 W floodlights on the spraying boom plus two additional lights, and the 50-metre power cable is on a manual cable reel.