Energy saving: Compared with the traditional hydraulic press, the electro-hydraulic servo-driven hydraulic press has remarkable energy-saving effect. According to the different processing technology and production rhythm, the servo-driven hydraulic press can save a lot of electricity.
The following is an analysis of the power consumption of the two hydraulic presses in each working stage.
1. When the slider is going down quickly and the slider is stationary at the upper limit, the servo motor does not rotate, so it does not consume electricity. The traditional hydraulic press motor still rotates at the rated speed, and still needs to consume about 20%-30% of the rated power (including the friction of the motor, cable, oil pump, hydraulic channel resistance, pressure drop of the valve, mechanical transmission connection, etc. energy).
2. In the pressure holding stage of the servo-driven hydraulic press, the speed of the servo motor only supplements the leakage of the oil pump and the system. The speed is generally between 100rpm and 1500rpm, and the power consumption is only about 1%-10% of the rated power. According to the different pressure holding methods of traditional hydraulic presses, the actual power consumption in the pressure holding stage is about 30%-100% of the rated power.
3. Compared with the ordinary motor, the efficiency of the servo motor is higher, which determines that the servo-driven hydraulic press is more energy-saving.
Low noise: The oil pump of this electro-hydraulic servo-driven hydraulic press adopts a low-noise pump. The traditional hydraulic press generally adopts an axial piston pump. Under the same flow and pressure, the noise of the low-noise pump is about 5dB lower than that of the axial piston pump- 10dB. When the servo-driven hydraulic press runs at the rated speed during pressing and returning, the emission noise is about 5dB-10dB lower than that of the traditional hydraulic press. When the slider is about to get off the machine and the hydraulic press is stationary, the speed of the servo motor is 0, so there is basically no noise emission from the servo-driven hydraulic press. In the pressure holding stage, due to the low speed of the motor, the noise of the servo-driven hydraulic press is generally less than 80dB, while the noise of the traditional hydraulic press is about 80dB-100dB.
3. The servo hydraulic press generates less heat: reduce the cost of refrigeration and hydraulic oil, the hydraulic system of the servo-driven hydraulic press has no overflow and heat, and there is no flow when the slider is stationary, so there is no hydraulic resistance to heat, and the heat of the hydraulic system is generally about the traditional one. 10%-30% of the hydraulic press. Due to the low calorific value of the system, the general servo-driven hydraulic press may not be equipped with a hydraulic oil cooling system, and some of the larger calorific value can be equipped with a low-power cooling system.
The oil consumption and oil tank are smaller than those of general hydraulic machines: due to the characteristics of zero speed and small heating point of the oil pump most of the time, the oil tank of the servo-controlled hydraulic machine can be smaller than the traditional hydraulic oil tank, and the oil change time can also be extended, so the servo drive Hydraulic presses generally consume less hydraulic oil.
High degree of automation, good flexibility and high precision: the pressure, speed and position of the servo hydraulic press are fully closed-loop digital control, with a high degree of automation, the system pressure is measured by a pressure sensor, and the measured pressure does not change with the change of oil temperature and oil viscosity , so the pressure control accuracy is high, the repeatability is good, and the quality stability of the product is improved.
Convenient maintenance: The hydraulic system is greatly simplified due to the cancellation of the proportional servo hydraulic valve, the speed regulating circuit and the pressure regulating circuit in the hydraulic system. The cleanliness requirement of hydraulic oil is far less than that of hydraulic proportional servo system, which reduces the influence of hydraulic oil pollution on the system.
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