Papers by Author: Qing Liang Zeng

Abstract: Taking the swash plate piston pump as the research plant, the paper introduces the composition of digital control system of variable pump first; Then the mathematical model of variable mechanism is established according to which the closed-loop flow control system and the power control system are worked out. Also, the paper shows the stability margin of the control system and analyzes some response indices to step command under Matlab simulation. Aiming at the shortage of the closed-loop control system, the paper gives an idea of an optimization design of the compound power control system based on both feed-forward and feedback control. Compared with the conventional closed-loop power control method, the compound one gets a 47.2% reduction in the adjusting time and a 38.2% decrease in the overshoot indicating that the adjusting process is obviously shortened and the disturbance effect effectively weakened.

Abstract: For the performance testing demands of roadheader hydraulic components, a hydraulic system of multi-interface and high-precision sensors is built and the signal acquisition and processing system based on PLC and data acquisition card high speed acquisition module is established. A software system based on LabWindows/CVI is developed. High precision, reliability, stable and functional test system is built by using precise sensor technology, electro-hydraulic proportional control technology and automation instrument technology, and then the pump and motor performance tests is completed. The system can simulate the actual working conditions of the pump and motor, making the test results more accurate and credible.

Abstract: The existing coal slurry drying process efficiency is low and discharge waste gas and water. So a green and efficient coal slurry drying process was putted forward in this paper. A technical support was provided for construction of resource-saving and environment friendly mining area.

Abstract: Aiming at the technological characteristics and production status of the mine hoist hydraulic brake safety protection system, the overall monitoring framework and monitoring scheme of the hoist brake system is proposed from the perspective of comprehensive protection and control: the high-performance data acquisition card and virtual instrument platform (Labview) are selected to carry out program development work on the system. System displays the monitoring data online and alarms some physical quantities, as well as stores and retrieves some important parameters and operational failures in order to achieve online monitoring security of braking system. So it provides technical support for the repair and maintenance of the mine hoist and scientific protection of the safety running of the hoist.

Abstract: Shearer cutting unit is the main working mechanism of the shearer and its performance is a direct reflection of the performance of the shearer. Three-dimensional solid model of shearer cutting unit mechanical system was built by 3D modeling software Pro/E, and then it was imported into ADAMS through a dedicated interface module. After adding constraints and movement driven and calibrating model, the simulation analysis in the ADAMS was established and analysis of the forces of the three key pin hinge point was achieved, which provided the basis for the shearer cutting unit mechanical system design.

Abstract: The shield machine is a large complete sets of equipment used for underground tunnel excavation in the city construction,it has been widely used in the tunnel excavation. Cutter is one of the key components of shield machine. Different geological conditions and badly application environment make the cutter stress complex. German Herrenknecht S749 shield cutter as an example, using PRO/E software to establish the three-dimensional model, ANSYS Workbench module establishes the cutter corresponding finite element calculation model, the force characteristics of the cutter in working process were analyzed, obtained the cutter`s stress strain distribution. The research results can provide basic data for the wheel structure design and construction maintenance.

Abstract: This paper studied the fine registration techniques of measuring data of complex product and proposed a new registration method based on triangle constraint. Firstly, the paper made a research on specifying the proper measuring reference points and the setting of reference coordinate system, and afterwards proposed a fine registration algorithm of measuring data, Which is about realizing the fusion of reference coordinate system based on the congruent judgment of reference triangle and fulfilling precise match of data with measuring error on the basis of controlling the rotation of data blocks and minimizing the registration error.

Abstract: In this paper, a new type of hydraulic test bed is developed which can be used for performance testing of hydraulic valves, hydraulic motor and hydraulic pump. The composition structure diagram of hydraulic system, power supply system, and the signal flow diagram of data acquisition system were designed. The characteristics of the LabWindows/CVI development tools and the usage of Prodave MPI/IE 6 network communication tools were introduced, also the database storage and access technology in LabWindows/CVI environment. It was proved through the practical application that the test bed is reliable and has the merit of higher precision and automation level, and simple operation.

Abstract: As is known to all, new mechanical product design is always on the basis of the original product, so to better use the exiting design resource, a mechanical product variant design method is presented. The new method is based on SML and parameter CAD. According to different geological conditions of coal mine, different types of hydraulic support are needed to design. So as a typical kind of mechanical product, hydraulic support is given as an example to demonstrate the new variant design method. Finally with SOLIDWORKS as a specific application object, integrated with SQLServer2000 database, a hydraulic support variant design system is realized by Visual Basic program, which shortens the cycle of mechanical product development and reduces duplication mechanical design greatly.

Abstract: Hydraulic test platform is a very important testing tool for hydraulic products of engineering machinery. In this paper, a new type of hydraulic test bed is developed which can be used for performance testing of hydraulic valves, hydraulic motor and hydraulic pump. The composition structure diagram of hydraulic system, power supply system, and the signal flow diagram of data acquisition system were designed. The communication between sensors and computer via RS232 were researched. At last, the hydraulic test software is developed by using Labwindows/CVI and Simense PLC.