The Design Of The System For Prestressed Tention Device Based On S3C44B0X Microcomputer

The Tension of the Tendons is a key process of the construction of the Tendons. The traditional system of the Prestressing is formed by the pump and the jack, with the pump to pressure the gauge read-out and control the tensile force. The Tensile Value is measured by artificial work. This process can be affected by a large number of man-made factors, which can lead to poor accuracy. The construction is low efficiency and the strength of the construction is big.The digital equipment of the prestressing tension equipment design is based on the normal subject of equipment of the prestressing tension equipment. In general, it is based on the hardware platform of the Samsung S3C44BOX embedded microprocessor which transplanted the embedded operating system, the uClinux. Using the device, the operator only need to input the control commands on the touch screen to achieves the dual control of the tension and elongation values. During the tension process, tension control and elongation values are displayed on the touch screen. When the tension does not meet the requirements, it will generate alarm and stop the tension works. After stretching, it generates reports by the printing interface to printing the data. the data ensures the authenticity and accuracy of the construction records. the network interface implements the remote transmission of the data.The general hardware system includes the control box, the operative part, the measure part. The control box is formed of the core board and the peripheral boards. The S3C44BOX microcontroller, RAM memory, ROM memory, power supply, JTAG interface Composites the core board. Peripheral board includes stepper motor driver circuit and the interface module, DC motor interface, the displacement transducer interface, the pressure transducer interface, network interface, alarms, print interface and touch screen interface. the implementation part consist of the stepper motor, stepper motor drive circuit, DC motor, DC motor drive circuit, pumps and jacks. The measure part include composite force sensors, displacement sensors, pressure transmitters and displacement transducer.Software uses the open source uClinux, of which the development has low costs. The first work is to load the bootstrap, the Bootloader, portable the u-boot to the S3C44BOX control box, which is worked for the subsequent software upgrades and fixes, which also provides the convenience of automatic updates. After the design of the principle, it migrates the uClinux to the S3C44BOX control box. Migration process is in accordance with certain procedures, the source code files is modified to suit the S3C44BOX control box hardware.After the success of the transplantation, the most critical part is the design of the drive of different devices. The driver procedures of the S3C44BOX control box include touch-screen device drivers, network drivers, stepper motor drives, DC motor drive, printer driver and ADC driver. This paper only pay attention to the touch screen driver and the network driver preparation. When the drive programming is completed, kernel configuration and compilation of the uClinux operating system is then done.Based on the Uclinux, this paper transplanted the embedded graphics interface, QT/E. QT/E is commonly used in the graphical user interface of the embedded system. It is also the basic software of in applications. This paper displayed the QT/E graphic on the touch screen. The device can be simple operated in real-time situations with high precision and intuitive display, which can also be used to automatically generate and print the reports of the Construction Report.