Application of Single Chip Microcomputer in Automatic Control System of Ironing Machine

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Application of Single Chip Microcomputer in Automatic Control System of Ironing Machine [Copy link]

my country has a clothing consumption market of 1.2 billion people and is also a major clothing exporter. With the increasing demand in the ready-made clothing market in recent years, small clothing manufacturers have developed very rapidly, and the demand for small ironing systems has increased. Most of the original small ironing machines are manually controlled devices, which require high operating experience of operators. Due to the different operating levels of operators, product quality problems often occur and the damage rate is very high. In order to meet user needs, we designed an ironing control system by ourselves. The ironing machine uses AT89C51 as the main controller and DMF50174 as the display module. It can store and modify 10 ironing programs, change the operating parameters arbitrarily according to the process and fabric, and display the parameter settings of the ironing program in a graphical way. The system is also equipped with a temperature control system, which uses TLC549 serial A/D converter and linear temperature sensor to realize temperature acquisition and control. The system can control the temperature valve according to the temperature range pre-set in the ironing program. During the ironing process, the system displays the parameter settings of each solenoid valve in a graphical way on the LCD screen, and indicates the current system operation process with a highlighted scan line.
1 System overall requirements
The control machine uses ATMEL89C51 to form a single-machine control system. Each ironing process is roughly divided into the following steps: mold closing, hot pressing (2 times), upper steam spraying, exhaust, lower steam spraying, mold opening, etc. Sometimes the execution times of a step in a process may be different. The system should flexibly adjust the starting time and duration of each step. The system should also have a temperature control system so that the ironing temperature can be controlled as required to avoid damaging the fabric.
2 System overall design
2.1 Solenoid valve control part
Each step of the ironing machine is controlled by different control valves. The system has: mold closing valve, pressure valve, steam spray valve, steam extraction valve, temperature control valve and other valves. In order to facilitate expansion, the system has enough expansion space. This system uses P1 port as the control port, and also expands a 74LS377 for backup. It can control up to 16 solenoid valves to meet system requirements.
Each control valve of this system is an AC solenoid valve. In order to avoid electromagnetic interference, photoelectric isolation is used.
2.2 Temperature Control Section
In order to control the temperature, a temperature acquisition section is designed, which uses the resistive temperature sensor PT100 and the A/D converter TLC549 with serial control from TI to realize temperature acquisition.
TLC549 is a CMOS A/D converter based on an 8-bit switched capacitor successive approximation A/D converter. It is designed to interface with a microprocessor or peripheral device serially through 3-state data output and analog input. TLC549 only uses the input/output clock (I/O CLOCK) and chip select (CS) input for data control. The I/O CLOCK input frequency of TLC549 can reach up to 1.1MHz.
TLC549 provides an on-chip system clock, which usually operates at 4MHz and does not require external components. The on-chip system clock makes the operation of internal devices independent of the serial input/output timing and allows TLC549 to work as required by many software and hardware. I/O CLOCK and the internal system clock together can achieve high-speed data transmission and a conversion speed of 40,000 conversions per second for TLC549.
Other features of the TLC549 include general control logic, on-chip sample-and-hold circuits that can work automatically or under microprocessor control, differential high-impedance reference voltage inputs, high-speed converters that are easy to implement ratiometric conversion, scaling, and circuits that isolate logic and power supply noise. The design of the entire switched capacitor successive approximation converter circuit allows conversion to be achieved in less than 17μs with a maximum total error of ±0.5 least significant bit (LSB).
2.3 LCD display
The system is equipped with a membrane keyboard to modify the control program and set up the system. For ease of operation, the system uses an independent LCD display system that can display the system temperature, the status of each control valve, the system operating status, etc. in real time.
The system uses the advanced dot matrix LCD display module DMF50174NB-FW from Japan's OPTREX company, and also uses the SED1330 LCD display controller produced by Japan's SEIKO EPSON company.
The DMF50174NB-FW LCD display module has the characteristics of high sensitivity, high reliability, low power consumption, long life, high brightness, etc. It is a 320×240 dot matrix. The module has two display modes: character and graphic. The display font is 8×8 dot matrix, which fully meets the requirements of industrial production.
SED1330 is an advanced character and graphic LCD display controller. It is the most powerful one among similar products. It has the following characteristics:
SED1330 is not only suitable for 8080 series MPU interface, but also for M6800 series MPU interface. It sets two pins SEL1 and SEL2 in the interface part as the interface function conversion setting of MPU.
SED1330 has a powerful I/O buffer in the interface part of MPU, which avoids the status check items of general controllers. MPU can access SED1330 at any time without asking the "busy" flag.
SED1330 has a rich instruction set, and most instructions have parameters, up to 10 parameters. The SED1330 instruction can not only realize the synthesis display of the contents of two display areas according to different logical relationships, but also the synthesis display of the contents of three display areas. Through the synthesis display, character and graphic mixed display, character and text feature display, flashing display and half-tone display can be realized.

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