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Apr 16,2020
In China’s casting industry, medium-frequency induction furnaces equipped with a solid-state power supply featuring a full-bridge parallel inverter using silicon-controlled rectifiers (SCRs) are commonly referred to as “medium-frequency furnaces.” On the other hand, medium-frequency induction furnaces equipped with an IGBT half-bridge series inverter solid-state power supply are typically called “variable-frequency furnaces” (though this term is not entirely accurate; it’s used merely to distinguish them from medium-frequency furnaces equipped with SCR-based full-bridge parallel inverters). Since these two types of induction furnaces employ different inverter power supplies, their operational performance also differs significantly. In the field of casting, medium-frequency induction furnaces serve three primary purposes: melting, holding temperature, and pouring. Because...
Apr 16,2020
The medium-frequency induction heating furnace boasts advantages such as compact size, light weight, high efficiency, superior thermal processing quality, and environmental friendliness. It is rapidly replacing coal-fired furnaces, gas-fired furnaces, oil-fired furnaces, and conventional resistance furnaces, making it a new-generation metal heating equipment. The medium-frequency induction furnace is a key piece of equipment in casting, forging, and heat-treatment workshops, and its operational stability, reliability, and safety are essential guarantees for the smooth and stable operation of continuous casting, forging, and heat-treatment production lines. The medium-frequency induction furnace holds great potential for development in the field of thermal processing, particularly in the production of pre-forging heating furnaces, through-heating furnaces, and equipment used for processes including through-heating, rolling, forging, pipe bending, heat treatment (quenching), and welding.
Apr 16,2020
The fault manifests itself as an exceptionally high output current—even when the furnace is empty—and the power cabinet produces a heavy, resonant sound during operation. After startup, if you turn the power knob to a lower setting, you’ll notice that the intermediate-frequency output voltage is higher than usual. Using an oscilloscope, sequentially observe the voltage waveforms across the anode-cathode junctions of the four inverter thyristors. Under normal conditions, the waveform for each thyristor should resemble the one shown in Figure 3. However, if three bridge arms are operating, you’ll find that the waveforms of two adjacent thyristors are normal, while the waveforms of the other two adjacent thyristors show either no waveform at all or a sinusoidal waveform, as illustrated in Figure 4. In the case of the Yunnan intermediate-frequency forging induction furnace, if the KK2 trigger fails to fire properly, the waveform across its anode-cathode junction will be sinusoidal.
Apr 16,2020
Medium-Frequency Induction Furnace Manufacturer – Heilongjiang Medium-Frequency Induction Furnace
The protection circuit primarily serves to safeguard the intermediate-frequency power supply system. If the protection circuit malfunctions erroneously, it can easily cause the intermediate-frequency power supply to fail to operate. Conversely, if a fault occurs but the protection circuit fails to act, the intermediate-frequency power supply is likely to suffer damage. 1. False Operation: External interference can have an impact. Sudden changes in load, combined with the proximity of the detection circuit to high-power circuits, can induce interfering signals. In the case of a stainless steel intermediate-frequency induction furnace, this can lead to fluctuations in the detected current or voltage values, causing the overcurrent indicator or overvoltage indicator to light up and triggering the inverter to shut down. 2. Failure to Operate: a) The detection circuit’s power supply may be without voltage—for example, due to damage or desoldering of electronic components in the detection circuit. b) Components in the detection circuit...
Apr 16,2020
While one medium-frequency furnace is engaged in melting operations, the other medium-frequency induction furnace is either performing casting operations or undergoing maintenance and furnace rebuilding. During small-capacity, multi-casting operations, the power supply originally feeding the melting furnace can be briefly switched to the casting furnace to rapidly raise its temperature, thereby compensating for any drop in casting temperature. The alternating operation of the two medium-frequency induction furnaces—switching between melting, casting, and charging—ensures a continuous supply of high-temperature, qualified molten metal to the casting line. This “one machine, two furnaces” configuration boasts a high operational power utilization factor (K2 value) and is widely adopted. As is well known, medium-frequency induction heating equipment is extensively used for metal melting, heating, quenching, heat treatment, and more.
Apr 16,2020
The medium-frequency power supply is a static frequency converter that transforms three-phase power at industrial frequency into single-phase power. It features strong adaptability to various types of loads and a wide range of applications, primarily used in the melting, holding, sintering, welding, quenching, tempering, through-heating, purification of molten metals, heat treatment, pipe bending, and crystal growth of diverse metals. The standard output power series ranges from 30 kW to 4,000 kW; the standard configuration melting furnace series spans from 5 kg (30 kW) to 5,000 kg (4,000 kW); and the standard oscillation frequency series ranges from 0.5 kHz to 8 kHz. The operating principle of the medium-frequency power supply involves using a three-phase bridge fully-controlled rectifier.
Jul 03,2020
Kangda Electric Furnace—High-Quality Magnetic Yoke—Induction Heating Equipment
This part of GB/T 10067 specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, as well as ordering and delivery procedures for induction heating equipment. This part applies to industrial induction heating equipment operating at power frequency, intermediate frequency, and high frequency, both in vacuum and non-vacuum environments. It covers various types of induction furnaces used for melting, holding temperature, and casting, as well as induction heating devices used for through-heating, heat treatment, sintering, welding, and other similar processes.
Jul 03,2020
The technological development and promotion of medium-frequency induction furnaces are meeting growing demand in the field of metal thermal processing. During operation, medium-frequency furnaces utilize the principle of electromagnetic induction, making them more energy-efficient and environmentally friendly compared to traditional coal-fired furnaces. In the later stages of use, it is essential to perform basic maintenance and management on medium-frequency furnaces to prevent issues such as failure to start up properly, abnormal noises, or thyristor burnout. (1) Inspect and clean the radiators to ensure efficient cooling performance; if necessary, carry out acid cleaning. (2) Check the water-cooling system for blockages and leaks, and verify that the water pressure relay is sensitive. The temperature difference between the inlet and outlet water should generally not exceed 35°C. (3) Inspect...
Jul 09,2020
The quality and performance of the refractory lining materials used in furnace linings play a fundamental role in determining the service life of the furnace. During furnace operation, the various processes involved also significantly impact the furnace’s lifespan; any improper operational practices can potentially shorten the furnace’s service life.
Jul 17,2020
Preventive Measures for Steel-Shell Furnace Leakage and Penetration Accidents
The core operating temperature of an intermediate-frequency melting furnace can reach up to 1,600℃, making it a high-risk piece of equipment. Once the equipment—especially the steel-shell furnace body—experiences a malfunction, it could lead to a serious accident. Therefore, it is of great significance to perform meticulous maintenance and upkeep on intermediate-frequency melting furnaces and to acquire a solid understanding of basic safety precautions for these furnaces.
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Kangda Electric Furnace specializes in the manufacture of the following equipment: KGCL series medium-frequency power supplies, KGPS series medium-frequency power supplies, GTR series medium-frequency induction heating furnaces...
Contact Information
Address: Yuhe Industrial Park, Weicheng District, Weifang City, Shandong Province
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