Question

4

The face of the cutter has 85 teeth. Each tooth is 60 cm long. The cutter face rotates about seven times a minute. When it rotates, the teeth cut large circles into the surface of the rock.

Pieces of rock fall to the ground. They are collected by large scoops. They are then dropped into chutes. When the cutter lace rotates upwards, the rocks fall onto conveyor belts They are then carried to the rear of the machine.

Hydraulic cylinders push the body of the cutter slowly forwards. As it moves forwards, steel shoes move outwards and grip the tunnel walls. At the same time, two legs push

down and lift the machine off the floor

Fifteen electric motors supply the machine with 6,375 horsepower. The power is connected to the cutters by

means of a 13,800-volt cable. There are two drills attached to steel arms. These are 5

located immediately behind the cutters. When the machine moves forwards, holes are drilled into the roof of the tunnel. Then the holes are filled with bolts and cement. This strengthens the roof. 6

The machine operator sits in a cabin at the heart of the machine. Here he/she controls its speed and direction. Video cameras monitor the cutter and the tunnel.

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Answer 1

Respuesta:

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