Digital Hydraulic Components And Hydraulic Control System

Along with the rapid development and increasing maturity of the electronic technology and network technology, the traditional hydraulic industry has been under certain impact. The fact that the electronics and fieldbus technology combine with the hydraulics must be a trend. And many domestic and foreign research results have come out.In view of this, we proposed this research project in the general direction. Then we collected much information about this topic and deeply studied the digital hydraulic technique. After these, we decided to develop a digital hydraulic pump based on the fieldbus. After the prudent choose, we took the CCY14-1B servo variable axial piston pump as the substrate object of study. On the basis of the original piston pump, we have designed the electrical operated drive device to make it driven by stepping motor. Through controlling the stepping motor, the accurate digital control of the piston pump is obtained. To its controller, we proposed that many kinds of design proposals, one kind of Programmable Logical Controller plan has carried on the actual design. We only need to establish the different software programs, and then the pump can realize the different variable patterns, such as the constant pressure, the constant power mode and so on.The main content of this thesis is as follows:In chapter 1, we briefly introduced the topic research background and the significance, and synthetically analyzed the development trend of digital hydraulic technique. Then we outlined the domestic and foreign application situation of the fieldbus technology in the hydraulic field, and expounded on the main content.In chapter 2, it has carried on the structural design to the digital pump's numerical variable mechanical drive, carried on the stress analysis to the stroking mechanism, and carried on the machine design computation to transmission device's main screw drive. On the base of that, we had determined each components' basic size, and had drawn up its three dimensional graph and the assembly body with three dimensional software SolidWorks 2006.In chapter 3, we designed the hydraulic transmission system that take the digital pump as the driving force, in order to be able to observe our pump's variable effects and test the pump's different digital variable modes, and completed the design of hydraulic station.In chapter 4, it has carried on the design to the digital pump's electric control system, introduced many kinds of design proposals of the pump's variable controller. At last, we chose the PLC controller plan to carry on the actual development, and made concrete to the electric circuit wiring schematic diagram and each electrical element's model of the system.In chapter 5, the test-bed of the digital pump was practically set up and how to realize the manual, constant pressure, constant power variables mode with the software programming methods were introduced. At last, there is the list of the part of the plc procedure.In chapter 6, we summarized the research of the whole thesis briefly, and brought forward sequential work to be done in the future.