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Design and Development of Dynamic Exhibition Sand Table

Author: DuanDeQiang
Tutor: ZhangHuaShu
School: Huazhong University of Science and Technology
Course: Mechanical Engineering
Keywords: Dynamic sandbox Control circuit MCU Stepper motor Subdivision Driver
CLC: TP273
Type: Master's thesis
Year: 2011
Downloads: 23
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Abstract

With the development of science, technology and the market economy, the Science and Technology Museum and Exhibition Center project. As an important part of the Science and Technology Museum and the Exhibition Gallery, the exhibition the sand table by the increasing number of concern, a lot of universities, research institutes its done a lot of research and development. The traditional exhibition sandbox dynamic effect, just a static display of a single physical model, the project dynamic exhibition sandbox another way, so that each pixel to display a variety of pattern image dynamic lift. Dynamic exhibition sandbox is also the future development direction and trends of the sandbox. In this paper, dynamic exhibition sand table software and hardware systems, including the design of the transmission mechanism of each pixel point lifting, lifting movement precise control system and PC pixel lattice coordination control system based microcontroller (MCU) pixels. Specific test by a rack and pinion mechanism, screw nut institutions, the comparison of the pulley timing belt, choose a suitable mechanical transmission. In the same time, the hardware circuit design, designed and developed a different drive circuit board, the main the L297/L298 driven program, THB6064, THB7128 driving scheme. The final decision THB7128 stepper motor driver chips, integrated drive technology segments very good improvement smooth movement of the stepper motor, stepper motor output torque is increased to a certain extent. The main process: stepper motor driven by the timing belt pulleys, pulleys, timing belt drive pixels down movement. The pulses emitted by the micro-controller (MCU), after the pulse distribution and the power of the driver chip THB7128 amplification, precise control of the movement of the stepper motor. The prototype of the project's dynamic exhibition sandbox total of 15 × 21 pixels, so with a 15 × 21 sets of driver and control board. PC control system is based on the development of the VC. First, read the pre-set graphic pattern into the host computer, in the VC environment, invoke the command processing graphics pattern read out the gray value of each pixel, and then distributed to lower after data processing machine, to coordinate the next bit machine The overall movement, allowing dynamic exhibition sandbox to form a predetermined graphic pattern. Under the joint efforts of the project team, the the a dynamic exhibition sandbox prototype successfully developed. Laid the foundation for the after market-oriented dynamic exhibition sandbox. Also pointed out the direction for the future focus on key imperative especially sand table surface dedicated film material.

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