Working Principle Of Underground Mining Trolley Electric Locomotive

The underground mining locomotive of trolley obtains electric energy from the circuit by means of pantograph. When the electric locomotive is running, the pantograph slides along the overhead line.

The power supply mode of the trolley type electric locomotive is that the high-voltage cable from the central substation supplies the three-phase AC power to the traction substation, reduces the voltage through the transformer, and then sends it to the converter equipment through the low-voltage cable, so as to change the alternating current into the direct current. The positive pole of the DC power supply is connected with the overhead line conductor through the power supply cable. During this period, the contact becomes the power supply point, and the negative pole is connected with the track through the return cable. The corresponding contact is called the return point.

During underground mining locomotive operation, the upper part of the electric locomotive running along the track obtains electric energy by contacting the overhead line with the pantograph, while the lower part uses the wheel to contact the track to form a circuit to make the traction motor work, so as to make the electric locomotive drive the mine car.

It can be seen that the running track of the trolley electric locomotive is also the conductor of the current circuit. In order to reduce the voltage drop of traction power grid, conductor or copper strip is usually used to connect at the joint of rail to reduce the resistance at the joint.