Development Of Three-axis Operation Control Devices Based On Electro-hydraulic Proportional Control

The traditional manipulative method of Construction Machinery mostly adopts to the integrated multi-channel manual conversion valves, through various connecting rods member and the flexible shaft control mechanism, a series of operation function which is going to realize were dispersesed on many control handles. The method needs more joysticks, the operating force is great, affected the quality and efficiency of operations to a large extent. Uses the multi-channel Electro-hydraulic proportional conversion valve and the operation control devices with multi-degrees of freedom, may realize the single-handed control of multi-degree of freedom, realizes to centralized control the movement of many hydraulic actuator proportionality, not only reduced the quantity of joysticks greatly, enhanced the handling quality, meanwhile may realize the remote handing, which can protect the operating personnel's safety effectively under some special environment.The research paper is for the purpose of developing one kind of three-axis operation controller with the above function characteristic. It can outputs three groups of analog voltage signa in proportion to the handle's displacement, through the handle's displacement quantity produced in different direction of the three-dimensional space, processed by Sensing circuit and Signal processing circuit, to control six proportion electro-magnet of the multi-channel Electro-hydraulic proportional valve via the proportional amplifier, thus realizes collective control many hydraulic actuator's movement by one joystick. The paper proposes one design proposal of the three-axis operation controller and the Signal processing circuit, on the basis of intensive studying the Electro-hydraulic proportional control system, taked the man-machine engineering as the basic criterion.It was detailedly described that the composition principle mechanical structure of the three-axis operation controller, the design method of the typical mechanism,the dimensioning of the critical components,the selection of sensing element and circuit analysis in this paper,designed respectively Three-dimensional model and mechanical engineering drawings by using CATIA and KMCAD,and physical prototype. The core of hardware circuit of signal processing unit is MCU C8051F330, it consist of designments of the signal collection circuit,the microcontroller circuit,the amplification circuit of signal processing and the A/D conversion circuit. software parts complete designments of the main program,the A/D conversion subroutine,the data processing subroutine,the D/A conversion subroutine,the demarcation of handle median by using C51 language.In debugging,limit value of handle movement in each axis was demarcated by using the software program.After the complete machine debugging and the function test, indicated that the design proposal of the three-axis operation controller was correctly feasible in this paper, its main function has been realized and the output satisfies the design request; The linearity was good on X axis and Y axis of the joystick, and the linearity of Z axis has been obviously improved ,modified by the software.