Styling characteristics of China-made 2015 impact-resistant induction melting furnace
With advanced level of sweeping constant power impact resistant induction melting furnace . The control system adopts large-scale programmable logic array module integrated control and a single board structure, which avoids the phenomenon that the operation of the equipment is unreliable due to poor contact after using the multiple board connectors for a period of time. The arithmetic processing of various signals and the execution of their corresponding actions are automatically performed according to the program. Digital control
The system replaces the functions to be performed by various relay control loops.
Its main features are as follows:
1. Unique sweeping start mode with 100% startup success rate
The inverter part adopts the sweeping zero-voltage soft start mode, and the starting performance is better than the ordinary zero-voltage soft start circuit. The sweeping mode is generally started as follows: Before the inverter circuit is started, the excitation thyristor is triggered by a signal higher than the resonant frequency of the tank, and the frequency of the excitation signal is controlled to scan from high to low. When the frequency of the excitation signal drops to near the tank resonance frequency, the intermediate frequency voltage is established. The frequency of the induction melting furnace and the L/C resonance frequency are the same through the frequency-locked line , and the startup is successful. In order to prevent the occasional failure of the induction melting furnace , our company has specially designed an automatic repeating start circuit to ensure a startup success rate of 100 %.
2 , regulator with fast response characteristics
According to our company's experience in the actual use of workpiece heating, we have designed a unique regulator with a response time of less than 100mS, which is completely suitable for the induction melting furnace to adapt to the requirements of fast response in the case of sudden load changes.
3, power supply constant power output, can guarantee high power factor ,
A specially designed impedance regulator detects the change in impedance and sends this change to the circuit for digital calculations, automatically adjusting the load impedance matching to bring the induction melting furnace to a constant power output. At the same time, due to the use of the impedance regulator, in the constant power section where the workpiece is heated, the operating power factor of the whole set of equipment can reach 0.92 (at this time, the rectification is always in the fully open state and the power factor is the highest).
4. Improve the reliable protection function:
The control circuit is provided with various protection measures such as overcurrent, overvoltage, incoming line phase loss, power supply under voltage, low cooling water pressure and high cooling water temperature. The sensitivity and reliability of each protection function are guaranteed. This system is a water-cooling device. For the safe and reliable operation of the equipment, the water temperature of the cooling water should be monitored in real time. Our company has designed a special set of special monitoring instruments for the importance of water temperature monitoring. Two temperature detection points are mounted on each of the thyristors, and the same temperature detection point is also mounted on each of the resonance capacitors and the induction coils. This allows each water-cooled portion of the system to be monitored in real time without damage to components due to excessive water temperature at one point.
5 , advanced phase sequence self-identification function:
The control system contains the phase sequence self-identification circuit, so that there is no need to install the synchronous transformer in the system, and the phase adjustment sequence and synchronization work in the debugging and maintenance are eliminated.
6 , rich external control interface:
The device includes internal/external switching, automatic/manual transfer switches and their interfaces for easy remote automatic control. And with a temperature outer ring control interface, combined with infrared thermometer and temperature automatic control system, can easily achieve automatic temperature control. The automatic control system automatically adjusts the output power of the induction melting furnace so that the final heating temperature of the workpiece reaches the desired temperature range.
7 , debugging and maintenance is simple and convenient:
The setting of most parameters in the control panel is automatically completed by the internal circuit of the control board. The user adjusts the parameter settings of only a few potentiometers. Therefore, the control panel is extremely versatile and interchangeable, and debugging and maintenance is extremely simple and convenient. The installation of the thyristor is a cartridge-type integral silicon frame, which is more convenient when replacing the thyristor.
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