Energy-saving traction-type elevator

An energy saving method of an energy-saving traction machine, said method comprising the following steps:

• a. acquiring an overall weight value of the car in real time, converting the weight value into a control signal and sending the control signal to a controller, by the weighing device;
• b. comparing the acquired weight value and a preset value range and controlling the automatic transmission to perform an energy-saving operation, by the controller, the operation being as follows:
• when the weight value is lower than the lower limit of the set value, the automatic transmission is started to drive the hoist-type lifting mechanism to increase or decrease the balancing counterbalance, and transmit the torque generated by lifting the balancing counterbalance to the car, wherein, the sum of the rotating torque generated by the balancing counterbalance and the rotating torque generated by the car is equal to the rotating torque generated by the fixed counterweight;
• when the counterweight is within the range of the set value, the two ends of the steel cable on the traction machine are stressed to be balance while the clutch opens, and the balancing counterbalance does not take part in elevator movement;
• when the weight value is higher than the upper limit of the set value, the automatic transmission is started to drive the hoist-type lifting mechanism to increase or decrease the balancing counterbalance, and transmit the torque generated by lifting the balancing counterbalance to the fixed counterweight, wherein, the sum of the rotating torque generated by the balancing counterbalance and the rotating torque generated by the fixed counterweight is equal to the rotating torque generated by the car;
• c. lifting or descending the car by the traction machine;
• d. when the balancing counterweight moves to reach the upper early warning position sensor, triggering the upper early warning position sensor to send an early warning signal;
• when the car moves to the nearest level, controlling the power-generating electric motor to be started by the controller to descend the balancing counterbalance to a safe position, and then repeating steps a, b and c;
• d. when the balancing counterbalance moves to reach the lower early warning position sensor, triggering the lower early warning position sensor to send an early warning signal;
• when the car moves to the nearest level, controlling the power-generating electric motor to be started by the controller to lift the balancing counterbalance to a safe position, and then repeating steps a, b and c;
• when the car triggers the upper or lower limit position sensor when moving to the nearest level, stopping the elevator from running, and starting the power-generating electric motor to move the balancing counterbalance to a safe position, by the controller, and then repeating steps a, b and c.