Trench Sliding Contact Line
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Track flat car: It is an electric rail transport vehicle for in-plant use, solving the product transportation between spans within the factory. Also known as rail flat car, cross-span flat car, trolley, or electric flat car. It has the advantages of simple structure, easy operation, easy maintenance, large load capacity, and low pollution. It is widely used in machinery manufacturing and metallurgical plants as a means to cooperate with cranes for transporting heavy loads across spans within workshops. The KP series electric flat car has a low height, reinforced deck, easy modification, and convenient maintenance. It can be divided into KPC, KPJ, KPT, KPD, KPX, and KPDX series.
Trench Sliding Contact Line:
The KPC series electric flat car is a safety sliding contact line powered electric flat car. A trench is dug beside the track, safety sliding contact lines are installed inside the trench, and a cover plate hinged on one side is laid over the trench. When the electric flat car runs, the trench flip plate device installed on the car lifts the cover plate, and the flip plate device contains cables connected to the collector of the safety sliding contact line. After the electric flat car passes, the cover plate automatically returns to the ground. It ensures smooth passage for trackless vehicles. The trench flip plate sliding contact line type electric flat car is not limited by running distance.
The KPJ series is a cable reel powered electric flat car, powered by AC 380V via a cable reel. The cable reel is of hysteresis coupling type, ensuring uniform force on the cable and preventing damage. AC 380V supplies power to the YZ metallurgical motor on the car, which drives the car. When the car runs, the cable reel automatically winds or unwinds the cable. Due to the length limitation of the reel power supply, the maximum running distance is generally less than 200m.
The KPT series is a tow cable powered electric flat car. One end of the cable is connected to the ground power supply, and it is introduced into the control box through cable trolleys and traction steel wire rope, then supplies power to the YZ motor on the car to drive it. However, the running distance cannot be too long, generally not exceeding 50m, as longer distances may cause cable entanglement.
The KPD series is a 36V single-phase (three-phase) low-voltage track powered electric flat car, powered by track sliding contact lines. The ground step-down transformer control cabinet steps down single-phase (three-phase) AC 380V to single-phase (three-phase) 36V, which is fed to the car via track sliding contact lines, and then stepped up to single-phase (three-phase) AC 380V by the onboard step-up transformer. It provides power to the single-phase capacitor motor (or YZ metallurgical motor for three-phase). Since no cable is used, it is safe, reliable, not afraid of heat or impact, does not hinder cross transportation, and is easy to realize remote control and automation, bringing great convenience to plant transportation layout. However, the track construction requirements are high, track insulation must be ensured, and copper bar compensation lines should be added when the running distance exceeds a certain limit. For longer running distances, the number of step-down transformers must be increased.
Since the starting current flowing through the track during KPD car startup is very large (up to 1000A), there is a significant voltage drop at the end of the track, causing difficulty in starting the single-phase capacitor motor. Therefore, the maximum load capacity for single-phase KPD cars is 50 tons; for loads above 50 tons, three-phase 36V low-voltage track power supply is used with YZ metallurgical motors.
The KPDZ product inherits the advantages of the KPD car while avoiding the shortcomings of difficult starting and short running distance of the original model. The KPDZ car uses an onboard rectifier to rectify the single-phase (or three-phase) AC 36V from the track into DC 36V, driving a DC traction motor to run the car. Compared with AC motors, DC motors have the advantages of being less prone to burnout, having high starting torque, and strong overload capacity. Even under undervoltage conditions due to track insulation aging or other reasons, it can still work reliably.
The KPX series is a battery-powered electric flat car, powered by batteries. The battery supplies power to the DC traction motor, which drives the car. Compared with AC motors, DC motors have the advantages of being less prone to burnout, having high starting torque, and strong overload capacity. The running distance is not limited. It has greater safety, maneuverability, and flexibility than the KPJ and KPD series cars, with no limit on running distance and no insulation requirements for the track, making construction convenient and cost-effective.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
