Basic principle of ATOS electro-hydraulic proportional control

What is electro-hydraulic proportional control?
ATOS electro-hydraulic proportional control refers to adjusting hydraulic output parameters based on electrical input signals.
This is an ideal combination of hydraulic and electronic systems that can be used in open-loop or closed-loop control systems, as described in section ③, to achieve fast and stable control of various movements
The control. This type of control is necessary for modern modern machines and factories.
The electro-hydraulic system is a component of the fully automated discipline. Data, control, alarm and other information can be transmitted from the electro-hydraulic system to the centralized system in a concise manner through fieldbus
Electronic control system, or transmission from centralized electronic control system to electro-hydraulic system, refer to F002 "Digital Electro Hydraulic Technology".
The proportional electro-hydraulic control system has the following advantages over electromechanical systems: inherent overload protection function, adaptive force, fast action response, system self-lubricating, easy to achieve continuously variable speed
Variable force and torque, energy storage function, high power density, long lifespan, and high reliability.
② What is a proportional valve?
The core of electro-hydraulic control is the atos proportional valve, which can operate based on the input signal provided by the CNC machine tool
Factory 24 Vo power supply
Number (Tongchangshi 10V) regulates pressure P and flow Q. The proportional valve must be paired with an electronic amplifier
monitoring point
Combined use, (see sample G001), the amplifier provides proportional valve electromagnet based on the input signal
. Xu-E amplification alliance
-Appropriate current. The proportional electromagnet converts current into mechanical force acting on the valve core and restrains it
Input signal one
Reset spring: As the current increases, the output force of the electromagnet increases, and the reset spring is compressed,
So the valve core began to move. Proportional valves can be 4-stage or pilot operated, with or without pressure/position
Install sensors. Proportional valves with sensors can provide better adjustment accuracy. Regarding the leading structure
The proportional valve and pilot valve adjust the pressure and flow acting on the main valve
When the circuit fails, the reset spring resets the valve core to the neutral position according to the structure of the valve to ensure accuracy
reaction force
Power outage protection function. That is to say, when there is no input signal or electrical system failure,
This system configuration ensures that the system will not cause damage. Power outage protection can be directly achieved through proportional means
Pressure P
Valve implementation (power-off protection is an inherent function of valves) or through a series of actions of a group of valves.

Basic principle of ATOS electro-hydraulic proportional control

③ Control loop
Today's industrial equipment operates on multiple axes and is increasingly provided with ATOS electro-hydraulic control by proportional valves. Axis motion can be open-loop or closed-loop, depending on the requirements in practical applications
Accuracy. In many applications, motion loops do not require high precision to use open-loop, while in applications that require actuator positioning every time, closed-loop must be used.
Open-loop motion control
_①
Axis control is achieved by inputting a reference signal to the proportional valve amplifier.
There is no feedback on the adjusted hydraulic parameters.
Signal "
The accuracy of open-loop control systems strictly depends on the quality of hydraulic systems, especially proportional valves
The quality of the amplifier.
Closed-loop motion control
Axis control is achieved by inputting a reference signal to the closed-loop controller. This closed-loop controller is capable of receiving and executing
Sensors for surface actuators
Feedback signal from the sensor of the mechanism. According to the requirements of PID control, the controller compares inputs
The feedback signal is processed and the difference is transmitted to the proportional valve for calibration and adjustment.
③ Input signal
Compared with open-loop control, closed-loop control has much better accuracy. Due to the presence of feedback, it is not
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A row of controllers
In short, the higher the overall quality of the hydraulic system, the higher the precision of the shaft control.
Vulnerable to external environmental interference

Basic principle of ATOS electro-hydraulic proportional control