DEVICE FOR REGULATING PULLING SPEED OF FORKLIFT TRUCK BY CONTROLLING SPEED OF MOTOR IN PULLING VALVE CONTROL LEVER

摘要

PURPOSE: A pulling speed regulating device of a forklift truck by controlling speed of a motor is provided to increase the durability of the hydraulic motor, to extend the life span of the battery, and to reduce noise by regulating the speed of the motor according to pulling rate of the valve control lever with a compound motor and applying hydraulic pressure corresponding to the speed of the motor. CONSTITUTION: A pulling speed regulating device of a forklift truck is composed of a valve control card(10) inputting signals in pulling a valve control lever by a driver; a controller(20) inputting signals through pins(P1-P3) of the valve control card and outputting the pulse signal; a transistor Q1(30) turned on and off by receiving the control signal to control the series field of a pump motor through a pin(P4) of the controller; a transistor Q2(40) turned on and off by receiving the control signal through a pin(P5) of the controller to control the shunt field of the pump motor; and the pump motor controlling the speed in turning on and off the transistors.