Research on Microcomputer Controlled Multi-function Inverter Arc Welding Machine
In this research, we have focused on solving two problems: First, the SCM control system has been successfully applied to the field of arc welding power supply, and a complete closed-loop control system including data acquisition, PID calculation, and output characteristic control has been formed. Second, it solves the problem of industrial arc welding power supply, especially the interference of strong interference sources such as inverter power supply and high frequency generator to the single chip system, so that the whole equipment can run very reliably.
Basic working principle
The technical requirements of the subject are as follows: The host device has a variety of external characteristic output functions. When combined with the CO2 welding control box and the Wire feeder, it can form a MIG/MAG and CO2 welder, and has an expert system, unified control, and self-protection. Self-protection, crater filling, cutting ball processing and other functions. When combined with the TIG welding control box, it can form a TIG welder, and has the functions of contact arc ignition, high frequency arc ignition, pulse output and the like. When used alone, the main unit can be used as a manual arc welding power source.
According to the technical requirements, we set the design of the entire project as follows:
The mainframe adopts the thyristor inverter main circuit design, which has the advantages of mature technology, rapid dynamic response, reliable performance and high efficiency. The control loop adopts the 16-bit single-chip 8098 minimum system commonly used in industrial control, which performs almost all important tasks such as parameter setting, parameter calculation, current feedback, voltage feedback, back pressure detection and frequency modulation. Coordinate the normal operation of the entire welder and obtain the various features required.
Both the CO2 control box and the TIG control box are equipped with 8-bit single-chip 8951 as the main control system. Compared with analog control, it has obvious advantages in parameter setting, parameter setting, specification storage and recall, data receiving and transmission. Sex. Even in the production cost, the price of the industrial control microcontroller is greatly reduced, which is not inferior to the analog circuit. The data exchange between the host and the control box uses the serial communication method commonly used between the single-chip microcomputers. Practice has proved that the method is simple and easy, and the performance is also very reliable. After implementing the parity check method and certain anti-interference measures, even when the TIG welding high-frequency arc striking, there is almost no possibility of bit error.
Different welding methods are automatically identified by the host based on the signature transmitted by the control box. When the main unit is powered on, it is automatically set to the manual welding state. At this time, if the output end is connected to the welding tongs and the welding rod, DC manual arc welding can be performed. In the no-load state, after the TIG welding or CO2 welding control box is energized, they will send different signatures to the host. The host automatically converts the welding method according to the received signature, and cooperates with the control box for TIG welding or CO2 welding. . The main panel has indicators to automatically display the current working status as MMA, TIG or CO2. When the control box is turned off, the host can automatically return to the manual welding state.
The TIG welding and CO2 welding parameters are given by the preset keys corresponding to the control box panel input control box, and then the data is transmitted to the host by the control box. The manual soldering is given by the potentiometer directly on the main panel.
Basic working principle
The technical requirements of the subject are as follows: The host device has a variety of external characteristic output functions. When combined with the CO2 welding control box and the Wire feeder, it can form a MIG/MAG and CO2 welder, and has an expert system, unified control, and self-protection. Self-protection, crater filling, cutting ball processing and other functions. When combined with the TIG welding control box, it can form a TIG welder, and has the functions of contact arc ignition, high frequency arc ignition, pulse output and the like. When used alone, the main unit can be used as a manual arc welding power source.
According to the technical requirements, we set the design of the entire project as follows:
The mainframe adopts the thyristor inverter main circuit design, which has the advantages of mature technology, rapid dynamic response, reliable performance and high efficiency. The control loop adopts the 16-bit single-chip 8098 minimum system commonly used in industrial control, which performs almost all important tasks such as parameter setting, parameter calculation, current feedback, voltage feedback, back pressure detection and frequency modulation. Coordinate the normal operation of the entire welder and obtain the various features required.
Both the CO2 control box and the TIG control box are equipped with 8-bit single-chip 8951 as the main control system. Compared with analog control, it has obvious advantages in parameter setting, parameter setting, specification storage and recall, data receiving and transmission. Sex. Even in the production cost, the price of the industrial control microcontroller is greatly reduced, which is not inferior to the analog circuit. The data exchange between the host and the control box uses the serial communication method commonly used between the single-chip microcomputers. Practice has proved that the method is simple and easy, and the performance is also very reliable. After implementing the parity check method and certain anti-interference measures, even when the TIG welding high-frequency arc striking, there is almost no possibility of bit error.
Different welding methods are automatically identified by the host based on the signature transmitted by the control box. When the main unit is powered on, it is automatically set to the manual welding state. At this time, if the output end is connected to the welding tongs and the welding rod, DC manual arc welding can be performed. In the no-load state, after the TIG welding or CO2 welding control box is energized, they will send different signatures to the host. The host automatically converts the welding method according to the received signature, and cooperates with the control box for TIG welding or CO2 welding. . The main panel has indicators to automatically display the current working status as MMA, TIG or CO2. When the control box is turned off, the host can automatically return to the manual welding state.
The TIG welding and CO2 welding parameters are given by the preset keys corresponding to the control box panel input control box, and then the data is transmitted to the host by the control box. The manual soldering is given by the potentiometer directly on the main panel.
Fiberglass Mesh, Reinforced Fiberglass Mesh/Alkali-Resistent Fiberglass Cloth/Fiberglass, China Fiberglass Mesh
Anping County ShunXing Hardware Wire Mesh Co., Ltd. , http://www.shunxing-fence.com