Oil-electric hybrid CNC Press Brake Machine advantage principle

Oil-electric hybrid CNC Press Brake Machine advantage principle

The oil-electric hybrid CNC Press Brake Machine includes a power unit connected to the CNC system and a control valve set, the power unit includes a servo motor and a one-way quantitative pump connected to the servo motor, and an independent oil tank; the control valve set includes a relief valve, an unloading valve, a one-way valve, a reversing valve, a back pressure valve, a poppet valve, a safety valve and a liquid filling valve.

The speed of the servo motor of the power unit is controlled by the numerical control system, which in turn controls the displacement of the oil pump connected to it, thus realizing the displacement speed control of the actuating element (double rod cylinder). The torque setting of the servo motor through the CNC control system realizes the control of the output force of the left and right actuators (double rod cylinders).

Through the displacement sensor (scale or magnetic scale), the displacement readings of the left and right actuators (double rod cylinders) are fed back to the numerical control system, which compares them and then controls the left and right power units, thus realizing the closed-loop control of synchronization and positioning of the left and right actuators (double rod cylinders). The displacement sensor constitutes an internal feedback link to improve the control accuracy of the system.
Advantages of oil-electric hybrid electro-hydraulic system
Because the oil-electric hybrid CNC Press Brake Machine in standby, the motor does not turn, so the machine is in a zero noise state when not working; because the oil-electric hybrid CNC Press Brake Machine with oil only one-third of the electro-hydraulic synchronous machine, and the oil temperature can be controlled, so generally do not need to replace the hydraulic oil within three years; because the servo motor frequency response is much higher than the proportional valve, therefore, the oil-electric hybrid CNC Press Brake Machine a bending cycle time than the electro-hydraulic synchronous CNC Press Brake Machine 30% faster.

Through the comparison of the two control methods, we can clearly see that the oil-electric hybrid CNC (pump control) system has high energy efficiency, high precision, low noise, environmental protection and other characteristics, the specific advantages include the following 10 points.

(1) Pump control technology instead of conventional valve control technology, eliminating throttling loss, no overflow loss, energy saving is significant;

(2) Servo motor can be significantly overloaded in a short time, the actual installed power is only 50% of the theoretical installed power;

(3) The volume of oil tank is reduced by 75%, which greatly reduces the amount of hydraulic oil used;

(4) Low thermal equilibrium temperature, no need for cooling devices, and extended life of hydraulic components;

(5) Idle, fast down, holding pressure, return state noise significantly reduced, improve the working environment;

(6) Servo motor response speed is faster than ordinary motor, faster pressure and flow switching in emergency;

(7) The sensitivity of oil particles is reduced, from NS7 to NS9 level;

(8) Temperature sensitivity is reduced, and the working temperature is widened from -10 to 60℃ to -10 to 80℃;

(9) The maximum speed of fast down and return under specific conditions can reach 300mm/s;

(10) Work-in speed can be significantly increased, up to 20 ~ 25mm / s.

Oil-electric hybrid CNC Press Brake Machine synchronization better, really energy efficient, simple structure, faster, but the price is higher, how to achieve a reasonable cost and stable performance, that is, a higher cost performance is the premise of the enterprise to form a batch production, and get market acceptance.