1. The layout of each electrical part of the bridge crane. The three-machine power supply is not connected to the three main conductive sliding lines on the side of the workshop building parallel to the direction of the cart, and is introduced by the sliding collector brush; the power supply of the trolley electrical equipment and the connection between the electrical equipment are through the bridge. 21 trolley-mounted conductive slide wires installed on one side and introduced through a sliding collector brush.
The functions of the 21 trolley trolleys are: 10 for the main hook part, 3 of which are connected to the stator winding (5U, 5V, 5W) terminals of the main hook motor M5, 3 are connected to the rotor winding and the rotor external resistor The main hook electromagnetic brake brake YB5, YB6 is connected to the AC electromagnetic control cabinet (2), the main hook up position switch SQ5 is connected to the AC electromagnetic control cabinet and the main controller (2; for the auxiliary hook part 6 of which 3 Connect the rotor winding of the auxiliary hook motor M1 to the external resistor of the rotor, connect the terminals of the stator winding (1U, 1W) to the cam controller AC1, and connect the auxiliary hook hook position switch SQ6 to the AC protection cabinet; There are 5 trolley parts, 3 of which are connected to the rotor winding of the trolley motor M2 and the external resistor of the rotor, and 2 are connected to the M2 stator winding (2U, 2W) terminal and the cam controller AC2.
Conductive sliding wires are usually made of angle steel, round steel, V-shaped steel or I-beam.
2. The bridge crane adopts the wound rotor asynchronous motor to adapt to the frequent starting, braking, reversing, shifting and other operations under heavy load. The winding rotor resistance of the wound rotor asynchronous motor can obtain a large starting torque. , reduce the starting current, and have a certain speed range.
3. The main hook and the auxiliary hook should have a reasonable lifting speed. The no-load and light-load requirements are fast, so as to reduce the auxiliary time; the heavy-load requirement is slow, and the rotation speed can be reduced to 50%~60% of the rated speed; the lifting starts or When the weight is lowered to the vicinity of the predetermined position, the low speed is used, and the speed is divided into several gears around the rated speed of 30%, which is convenient and flexible.
4. The first stage of the hook lifting is used as the preparatory stage. The starting torque should not be too large, generally limited to 50% of the rated torque. This is to eliminate the transmission gap and tension the wire rope to avoid excessive mechanical shock.
5. When the load is lowered, the load torque is the potential energy resistance torque, and the motor can be operated in the electric state, the load reverse pull reverse state or the regenerative power generation braking state.
6. Complete zero position, short circuit, overload and terminal protection.
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