Constitution And Property Illustration:

　　This equipment utilizes the vertical constitution,which is beneficial to load and enables functions such as temperature measurement, sampling, and alloy element addition without disrupting the vacuum in the melting chamber during metal smelting. Additionally, inert gas can be infused to control the pressure and atmosphere within the furnace. This furnace type adopts a water-cooled confluence flexible cable rotating electrode structure, offering advantages such as energy saving and durability. The medium-frequency power supply is an IGBT frequency conversion device. The layout of the complete set of equipment is convenient for operation, maintenance, and overhaul, with a compact structure. These features are essential for vacuum induction furnaces used in modern production and scientific research experiments.

Main Components:

　　1. Furnace Cover

　　2. Furnace Body

　　3. Vacuum System (mechanical pump, vacuum valve, and connecting pipelines)

　　4. Alloy Charging Hopper

　　5. Induction Heating Device (induction coil)

　　6. Power Input Rotating Axis (rotating shaft)

　　7. Water-Cooled Confluence Busbar

　　8. Medium-Frequency Power Supply (including capacitors, medium-frequency transformer)

Furnace Body:

The vacuum furnace chamber consists of the furnace body and cover. The furnace cover opens horizontally by flipping. Both the furnace body and cover have double-walled structures with water cooling; the inner walls are made of 304 stainless steel and finely polished over a large area, making it easy to remove condensed water vapor and adhered dirt during smelting.

The furnace cover is equipped with auxiliary material feeding devices, observation windows, etc.

The auxiliary material feeding device on the cover allows for the addition of alloy materials during smelting. It includes an alloy feeding box and hopper. Pre-loaded alloy materials are placed in the feeding box before vacuum pumping. Under vacuum, the materials are dropped into the hopper through a vacuum-sealed handle and then fed into the crucible via the hopper. The observation window is fitted with heat-resistant quartz glass, and there is a movable stainless steel baffle below the glass. By turning the handle, the position of the stainless steel plate can be adjusted to ensure a clear view, protecting against high-temperature metal glare and facilitating observation of the metallurgical conditions within the crucible.

The furnace body is equipped with a coaxial rotating electrode (rotating shaft). The structure employs concentric copper tubes as the inner and outer electrodes, supported within a stainless steel sealing sleeve. The outer electrode is formed by welding two tubes together to create a water jacket. The space between the two electrode tubes is insulated with epoxy resin, and the conductive copper tube is cooled with water. The rotating shaft is connected to the power supply through a flexible cable and water-cooled confluence busbar. The pouring and tilting handle is connected to the rotating electrode through an insulating device, driving the crucible within the connected induction coil to tilt for pouring.

The induction coil is internally cooled with water and wound with copper tubes. It is connected to the end of the concentric rotating electrode, and the crucible is rammed and sintered within the coil.

Working Principle:

　　The heating element of the SG series vacuum induction melting furnace is a spiral tube-type induction coil installed on the coaxial rotating electrode within the vacuum furnace chamber. When medium-frequency current is input, it generates an alternating magnetic field, causing an induced electromotive force in the metal charge within the crucible inside the coil. This induces a current in the metal that opposes the instantaneous direction of the current in the induction coil. This eddy current, concentrated on the metal surface, forms a current layer with a high current density, generating a strong thermal effect. Under the action of Joule heating, the metal charge is heated until it melts.

　　If a graphite or other conductive material crucible is used within the induction coil, the crucible is inductively heated. Through conduction or radiation, this can heat, melt, or sinter certain metals or non-metal materials within the crucible.

Vacuum System:

　　The vacuum pump is equipped with a 2X-30 mechanical pump to meet user process requirements. The pump's outlet can be connected to the factory's exhaust pipeline.

　　The vacuum valve is a GI-50 vacuum butterfly valve, and a DYC-Q50 electromagnetic vacuum differential pressure release valve is installed at the mechanical pump's suction port.A vacuum gauge is used to measure vacuum levels. 

　　The equipment is equipped with both a pressure vacuum gauge (installed on the vacuum pipeline connected to the furnace body) and a thermocouple vacuum gauge. The vacuum gauge tube is installed on the pipeline connecting the furnace body's exhaust port to the GI-50 vacuum butterfly valve to measure the vacuum level in the melting chamber.The water-cooled confluence busbar is used to connect the medium-frequency power supply to the furnace's electrodes.

Medium-Frequency Power Supply:

The medium-frequency power supply is a static frequency conversion device that uses silicon components and IGBT modules to convert three-phase AC power from the utility line into single-phase medium-frequency power.

The induction power supply controller produced by our company utilizes uncontrolled rectification technology.Compared to other fully controlled rectification technologies, it offers advantages such as high power factor (>0.95) and low grid pollution. It features both constant current and constant power control modes, ensuring the controller always operates in effective power output mode and fully utilizes the input power supply. It is suitable for applications requiring frequent startups or continuous operation. The controller uses a human-machine interface with communication capabilities, employing the ModBus RTU protocol and RS-485 connection for remote reading and writing of controller parameters and operating status via communication.