Regardless of whether it is an overhead-type electric locomotive traction or a battery-type electric locomotive traction mine car, there are three operating states according to the different running states of the electric locomotive: start-up acceleration state, uniform running state, and braking deceleration state. Let's take a closer look at these three mining cart running states.
When starting and accelerating, if the couplings between the mine car in the train group are in a loose state, only after the first mine cart is pulled by the electric locomotive and the couplings between the mine carts are tensioned in sequence, the second, The third minecart moved in sequence. at the moment of startup. The electric locomotive produces a sharp pulling force on the coal mining car, that is, the minecart will be subjected to a large inertial force. When starting uphill, if the connectors between the minecart and the electric locomotive and between the coal mining car are under tension, or when the entire train is started, the train is still accelerating. Then the force on the l-th mining cart at this time.
When the entire train runs at the running speed, the entire train runs at a constant speed at this speed. At this time, the traction force acting on each mining cart is balanced with the running resistance of the mine car. Obviously, running uphill has a lot of resistance.
When the traction motor of the electric locomotive is powered off, and the mine car runs on a horizontal track or an uphill track by inertia deceleration, the inertial force is the same as the running direction, and the inertial force is balanced with the running resistance of the mine car.
When the train reaches the deceleration position, the traction motor of the electric locomotive is powered off, and the braking device provides the corresponding braking force, so that the entire train can safely stop within the specified distance according to the specified deceleration. For mining electric locomotives, the braking force is only Produced by electric locomotives. It is assumed that the couplings between the electric locomotive and the mining cart and between the minecarts are in a tensioned state before braking, because the electric locomotive and the minecart and the minecart and the mining cart are not rigidly connected.
After the electric locomotive brakes and stops, the coal mining car behind will not stop immediately, but when the electric locomotive stops, the first mine cart in the group will stop first after colliding with the locomotive, and then the other minecarts will stop. The carts collided with the mine carts that had stopped in front of them, and then stopped in sequence. At this time, each mine cart buffer is subject to a large collision force. Due to the collision, the momentum of the minecart changes in a very short period of time, and the collision force is very large, resulting in damage to the frame and the bumper.
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