CM4500: The Dinting Machine

Dinting - removing parts of the floor that lift due to ground heave - is essential in many underground workings to keep open vital roadways and galleries.

As travel and haulage tracks extend further away from access points, mine operators and civil engineering companies in the most affected mines and tunnels are confronted with a costly, time-consuming and ongoing challenge. In its dinter miner role, the CM4500 is the answer.

Dinting mining is one of the key activities influencing the design and development of the versatile Celtic Miner® 4500. Despite its compact size - 1.6m wide and 2.7m long – the CM4500 packs enough power to break up hard ground (50 Mpa). Its on-board and attached in-line conveyors eliminate the need for side-by-side cutting and clearing operations, making it ideal for dinting mining operations, especially in restricted spaces.

The CM system has been used by UK Coal as a dinter machine to keep open a retreat gate at Daw Mill colliery near Coventry. In some parts the headroom had reduced to just 1.5 metres, making it impossible to use large, conventional machinery. The company put in a CM4500 with a powerful 300 diameter cutting head with 20 picks, combined with a 0.5 cubic metre digging bucket on the end of a 180 degree articulated arm.

Because of the CM4500's compact design, it used two close-coupled planetary gearboxes and hydraulic motor units in its custom-built track drive system and another gearbox and motor to power the cutting head, which UK Coal said made it 'particularly resistant to high loads' – a major requirement for a dinting machine.

UK Coal said “To maintain the route to the face would normally have taken two or three men working every shift, but the CM4500, operated by one man, did the same job in about a third of the time. This method of dinting made a big difference at Daw Mill.”