Design of an experimental platform for hydraulic servo system

Keywords: control, servo, hydraulic, electric.

Abstract: VRLA (valve-regulated lead-acid) and Pump-control are the two kinds of power components for hydraulic servo system. With different command device, feedback measurement device and different corresponding electronic components, the hydraulic servo systems are different. To ensure maximum performance of the whole device, the overall design (including mechanical, electrical design) should be considered for hydraulic servo system. Machinery-electric-hydraulic should be in coordination with each other. The hydraulic system components are used to change the speed of hydraulic cylinder and alter direction of hydraulic cylinder and hydraulic motor. The solenoid valve for motor and hydraulic servo system and the control of pressure relay can implement by the electric section.

Introduction

With the rapid development of science and technology and the emergence of machinery-electric-hydraulic products, the demand of talents with auto-control technology is more prominent. In order to make comprehensive use of mechanical, electric and hydraulic theoretical knowledge, and proficiency master the knowledge of control engineering basis, an experimental platform for hydraulic servo system is manufactured, which can provide a platform for students to practice and the basis of tests necessary measures for the training of technical talents.

There are many kinds of technical means to implement control for the modern equipment, such as electrical methods, mechanical methods, hydraulic methods, electric hydraulic methods and pneumatic methods, and so on. The machinery-electric-hydraulic design has become the main trend of mechanical industrial technology and product development. The long-standing design method which separates from in labor pision, is time consuming. It is difficult to obtain the best design result of integration system.

The design concept of machinery-electric-hydraulic integration system is introduced in this design, to find the effective design concept and method to achieve automatic control of the experimental platform. The focus of the design of this experimental platform is to achieve automatic control of the hydraulic cylinder displacement, velocity and force. Therefore, the fuel tank, hydraulic system and electrical system design is the core of this design. High stability, high efficiency, safe, reliable, sensitive work is necessary [1-3].

The actuator of the experimental platform is made up of the symmetric hydraulic cylinder, the asymmetric hydraulic cylinder and hydraulic motor. The minimum servo cylinder can meet the requirements, the vibration frequency of 30Hz and the amplitude of 1.5mm. Hydraulic servo system is the closed-loop control system, which is made up of the electrical signal processing and the hydraulic power output. As the persity of electric detector, the closed-loop control system can be made up of many physical quantities. The electric apparatus, such as solenoid directional control valve and pressure relay and sensing, are applied in the hydraulic system which controls the driving control system for hydraulic cylinder and hydraulic motor. The control of solenoid directional control valve and pressure relay and motor is achieved by the electric control system. The whole installation with simple and compact structure, easy control, reliable performance and simple operation, plays a significant role for students to firmly grasp the knowledge.

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52 Advances in Material Engineering and Mechanical Engineering

Design requirement

The electro-hydraulic servo system is widely used, which has analog servo system and digital servo systems. Analog servo system can be pided into DC servo system and AC servo system. AC servo system can be pided into phase modulation and amplitude modulation servo system. The hydraulic control system controls the driving control system for hydraulic cylinder and hydraulic motor. The control of solenoid directional control valve and pressure relay and motor is achieved by the electric control system.