(1) High-pressure
The servo hydraulic system is characterized by a large output torque and power, which depends on the high pressure system. With the emergence of large robots, the development of high pressure hydraulic systems is a trend. From the perspective of man-machine safety and system component life, the increase of working pressure of hydraulic system is restricted by many factors. For example, the increase in the pressure of the hydraulic system increases the safety risk factor of the staff and the body; Corrosive substances or particulate matter under high pressure will cause more severe wear in the system; The increase of pressure leads to the increase of leakage, which reduces the volumetric efficiency of the system. The strength and wall thickness of the components are bound to increase due to high pressure, resulting in the increase of the component body, weight or work and the reduction of displacement and displacement under a given load, the working pressure is too high resulting in the reduction of displacement and work and the reduction of resonance frequency of hydraulic machinery, which brings difficulties to control.
(2) Sensitivity and intelligence
According to the needs of actual construction, the robot is developing in the direction of multi-function and intelligence, which makes the robot have strong data processing ability and high precision "perception" ability. The use of high-speed microprocessors, sensors and sensors not only improves the dynamic performance of the whole machine, but also shortens the response time, enabling the robot to react quickly to rapidly changing loads. Advanced laser sensors, ultrasonic sensors, language sensors and other high-precision sensors improve the intelligence of the robot and facilitate the flexible control of the robot.
(3) Focus on energy conservation and efficiency
The hydraulic drive system provides guarantee for high-power operation, but the hydraulic system is not efficient because of throttle loss and volume loss. Therefore, the development of new materials and the improvement of parts assembly process are also inevitable requirements to improve the work efficiency of robots.
(4) Play the role of software
Advanced microprocessors, communication media, and sensors must rely on powerful software to function. Software is the language in which the components talk to each other. Various software development platforms based on assembly language or high-level language are emerging, which provide more and better choices for developing robot control software programs. The control algorithm in software development is also becoming more and more important. The expert system can be used to establish a reasonable control algorithm. The integrated control algorithm of PID and fuzzy control will be applied more perfectly.
(5) Intelligent collaborative work
The cooperative operation of the cluster is the combination of intelligent single machine, modern communication equipment, GPS, remote control equipment and reasonable construction technology. This field provides a broad development space for the application of electro-hydraulic systems in robots
