China has a clothing consumption market of 1.2 billion people and a major exporter of clothing. With the increasing demand in the ready-to-wear market in recent years, small-scale garment manufacturers are developing very rapidly, and the demand for small ironing systems is increasing. The original small ironing machines are mostly manual control devices, which require high operational experience for operators. Due to the different operating levels of operators, product quality problems often occur and the damage rate is high. In order to meet the needs of users, we have designed the ironing control system. The ironing machine adopts AT89C51 as the main controller and uses DMF50174 as the display module. It can realize the storage and modification of 10 ironing programs. The operating parameters can be changed arbitrarily according to the process and fabric, and the ironing program can be displayed graphically. Parameter setting. The system is also equipped with a temperature control system that uses the TLC549 serial A/D converter and linear temperature sensor for temperature acquisition and control. The system can control the temperature valve according to the temperature range preset in the ironing program. During the ironing process, the system graphically displays the parameter settings of each solenoid valve on the LCD screen, and indicates the current system operation process with a highlighted scan line.
1 overall system requirements
The control machine adopts ATMEL89C51 to form a single machine control system. Each ironing process is roughly divided into the following steps: mold clamping, hot pressing (2 times), upper steaming, exhausting, lower steaming, mold opening, and the like. Sometimes it is possible that the number of executions of one step is different in one process, and the system should flexibly adjust the start time and length of each step. The system should also have a temperature control system to control the ironing temperature as required to avoid scalding the fabric.
2 overall system design
2.1 Solenoid valve control section
The various steps of the ironing machine are controlled by different control valves. The system has: a plurality of valves, such as a clamping valve, a pressure valve, a steam valve, a steam extraction valve, a temperature control valve, etc., in order to facilitate expansion, the system has With sufficient expansion space, the system uses the P1 port as the control port, and also expands a 74LS377 for standby. Up to 16 solenoid valves can be controlled to meet the system requirements.
The control valves of this system are AC solenoid valves. In order to avoid electromagnetic interference, photoelectric isolation is adopted.
2.2 Temperature Control Section
For temperature control, a temperature acquisition section was designed to achieve temperature acquisition using a resistive temperature sensor PT100 and TI's serially controlled A/D converter TLC549.
The TLC549 is a CMOS A/D converter based on an 8-bit switched capacitor successive approximation A/D converter. It is designed to interface serially to a microprocessor or peripheral via a 3-state data output and an analog input. The TLC549 uses only the input/output clock (I/O CLOCK) and chip select (CS) inputs for data control. The TLC549's I/O CLOCK input frequency can be up to 1.1MHz.
The TLC549 provides an on-chip system clock that typically operates at 4MHz and does not require external components. The on-chip system clock allows the operation of the internal devices to be independent of the serial input/output timing and allows the TLC 549 to operate as required by many software and hardware. The I/O CLOCK, along with the internal system clock, enables high-speed data transfer and conversion speeds of 40,000 conversions per second for the TLC549.
Other features of the TLC549 include general-purpose control logic, on-chip sample-and-hold circuitry that operates automatically or under microprocessor control, a differential high-impedance reference input, and a high-speed converter that is easy to implement a ratiometric conversion. Scaling and circuits that are isolated from logic and power supply noise. The entire switched capacitor successive approximation converter circuit design allows conversion with a maximum total error of ±0.5 least significant bit (LSB) accuracy in less than 17μs.
2.3 LCD display section
The system is equipped with a membrane keyboard to modify the control program and system settings. For ease of operation, the system uses a separate liquid crystal display system to display system temperature, status of each control valve, and system operation status in real time.
The system adopts the advanced dot matrix liquid crystal display module DMF50174NB-FW of Japan OPTREX company, and adopts the SED1330 liquid crystal display controller produced by Japan SEIKO EPSON company.
DMF50174NB-FW liquid crystal display module has high sensitivity, high reliability, low power consumption, long life and high brightness. It is 320&TImes; 240 dot matrix. The module has two display modes, character and graphic. The display font is 8&TImes; 8 dot matrix, which fully meets the requirements of industrial production.
The SED1330 is an advanced character and graphic liquid crystal display controller. It is the most powerful one in its class. It has the following features:
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.
The SED1330 is equipped with a powerful I/O buffer at the interface of the MPU, which avoids the status check items of the general controller. The MPU can access the SED1330 at any time without asking for the "busy" flag.
The SED1330 has a rich instruction set, and the instructions have parameters with up to 10 parameters. The SED1330 instruction can not only synthesize and display the contents of the two display areas according to different logical relationships, but also synthesize and display the contents of the three display areas. Through the composite display, character graphic mixed display, character text feature display, blink display, and halftone display can be realized. The display data sent by the SED1330 to the liquid crystal display module is transmitted in a 4-bit parallel manner, thereby greatly improving the capability of controlling the dot matrix liquid crystal display device.
3 system software design
The system software adopts modular design and is divided into the following parts: liquid crystal display control module, parameter setting module, ten separate ironing program settings and parameter display module, machine running status display module and temperature acquisition, control and display module.
In summary, the ironing machine control system designed and implemented in this paper has high practical value. At the same time, the functions and usage methods of DMF50174 liquid crystal display, SED1330 liquid crystal display controller and serial A/D converter TLC549 are introduced. This system is now used in Shanghai Weijie Garment Equipment Factory. After a long period of actual testing, the system performance is good.
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