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材料英语论文


ABSTRACT This lesson is concerning the system of weighing fireproof material SCM.The system is used to control the movement of calculation car and weighing of fireproof material.By designing this system of SCM,factory can reduce errors in weighing by hands and improve the producing efficiency.The system is designed to add material by hands.The worker give a dictate to SCM by keyboard, and the SCM give a dictate to the electromotor after processing the information in order to control the movement of calculation. After adding the material,all the information of this process is recorded by SCM ,showed on LED display,and also can be printed by printer.The design of this SCM system is divided into two main parts: design ofanalog electronic circuits (signal collection and amplifying)and I/O ports.The design of analog electronic circuits is to transform the information of weighing materials to electric signals by weighing sensor.After through amplified circuits,the electric signals entered the A/D chip and are transformed to digital signals which are put into SCM. The SCM process the digital signals and transmit them to the printer for printing.The design of I/O ports which I take part in mainly includes keyboard,LED display,transducer,electromotor port circuits,and approaching switch parts.The SCM receives the information input by keyboard through the chip of 8279 and control the display of LED.On the other hand,the SCM connect a chip of communication ports 8255A through the data bus.The 8255A chip is take charge for exchanging information with SCM,transducer,electromotor,and approaching switch in order to reach the target of control.

preface This design project is based on single chip microcomputer as the core, to design a refractory material ingredient weighing system, used to implement the refractory ingredients production line in the factory automation. Single chip microcomputer hereinafter referred to as single chip microcomputer and single chip microcomputer, also called the micro controller. It is on a semiconductor chip, integrated CPU, ROM, RAM, constitute a complete digital electronic computer. It can

with peripheral equipment such as printers, plotter, CRT, and even can be connected to the Internet. Its characteristic is: small volume, less weight, the price is cheap, small power consumption; It according to the request of industrial environment design, channel signal is influenced by the outside world is small, so the high reliability; Control function is strong, fast; On-chip memory capacity may not very big, I/O pins are often enough, but the memory and I/O interface is easy to extend. At the beginning of the design, we went to the field visit wuxi sujiahang refractory plant production line. In production workshop, with sensors on the guide rail of a car equipped with single-chip microcomputer control system of weighing, at the top of the car, with different ingredients of feeding mouth, is a row of single chip microcomputer by receiving and processing positioning signal coming from the rail car, and weighing sensor ingredients from the measuring signal in weighing ingredients under manual control. After each operation by connecting to the printer, the output loading information. Considering the actual industrial

production environment, we chose the MCS - 51 series microcontroller chips compatible chip AT89C52 as the core of the whole system. Is the AT89C52 ATMEL company produces 8052 compatible chips, which have an internal Flash (Flash) memory can wipe over and over again. On chip data storage to 256 bytes. The program memory is 8 KB, there are three 16-bit timer/counter; There are six interrupt source. This graduation design instructor Zhu Jianhong, subject members for NiJiangTao, Yang Jiaming. I mainly involved in the input and output interface part of the system design. Yang Jiaming students specializing in analog circuit design (signal acquisition and amplification).

And weighing the weighing sensor information is converted to analog signals, enlarge by two-stage amplifier circuit. 2, the large analog signals through the analog-to-digital conversion chip ADS7805 convert digital signal into the microcontroller. 3, USES AT89C52 SCM (single chip micyoco) chip, the signal processing. 4, single chip microcomputer 8279 keyboard/display interface chip via the data bus connection, 8279 through SL0 ~ SL2 chip Scanning output connection lines to 3-8 decoder 74 hc138, using 8279 chip RL0 ~ RL3 pin with the level signal output end of the 74 hc138 Y0 ~ of Y4 keyboard matrix. 8279 chip, on the other hand, by displaying the information output connection eight LED digital tube display. Single-chip microcomputer 74 via the data bus connection hc377 trigger also can be directly connected to the LED digital tube display, constitute the other eight. 5, single-chip microcomputer through programmable parallel communication interface chip 8255 a connection photoelectric coupler a

I/O interface, even Pick up the two main equipment: 1, close to switch, parking space detection role; 2, three-phase motors (frequency converter to connect with the action button control), to control the movement of weighing the car. 6, microcontroller system through the TTL/RS232 level conversion chip to connect to the printer. Charging time, material, printing Such as data warehouse number and weight.

My graduation design task is refractory batching scale car design of single-chip microcomputer system, this system is used for different ingredients quantitative, convenient for production. Also can say that this is an essential part in the process of production. Design the single-chip microcomputer system can reduce the artificial error of weighing, improve production efficiency. First, let's intuitive look at the whole system. On the ground of workshop, we laid a sensor with guide rail, guide rail on one of weighing the car is equipped with single-chip microcomputer control system, is at the top of the car, is a row of feeding mouth with different ingredients. The whole system is the core of the car on the single chip microcomputer system. We use single chip microcomputer receiving and processing signals coming all parties, including: positioning signal coming from the rail car, with the scale of the ingredients of the measuring signal from the sensor, through single chip microcomputer connection LED display, the operator can see clearly, have been weighing ingredients information. Through the keyboard connected to the microcontroller, the operators can issue commands, make the car along the guide rail to move to the next feeding weighing feeding port. It is important to note that the movement of the car is driven by motor controlled by single chip microcomputer to. On the other hand through RS - 232 single chip microcomputer (from TTL gate circuit transformation) output interface, we can connect to the printer, is used to output loading information


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