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Composition of the mechanical parts of the medium-frequency induction furnace
Intermediate-frequency furnace, furnace body, furnace cover, cooling tower, tilting mechanism, power transformer, coil
1. Induction melting furnace body
The furnace body consists of a welded steel shell frame, magnetic yoke, induction coil, and other components. The furnace body’s structure and mechanical strength meet the technical requirements and standards of the machinery industry, and it is colored blue. After welding, the furnace body undergoes natural aging treatment to relieve residual stresses. The furnace body features a hydraulic cylinder for tilting the furnace.
2. Medium-frequency furnace coil
This coil uses a rectangular cross-section that conforms to the national standard. T2 Copper materials ( With you Purity 99.95% Above), seamless, with a wall thickness of 4 mm Ensures strength and leak-proof performance; the surface of the copper pipe undergoes multi-layer insulation and is treated with impregnated insulating varnish, enabling it to achieve... H Class H insulation. Both the inner and outer layers of the coil are coated with fire-resistant mortar, and the spaces between turns are filled with fire-resistant mortar (mortar can be applied on-site).
3. Tilting Mechanism for Induction Melting Furnace
The tilting mechanism consists of a hydraulic pump station, a tilting device, a furnace lid rotating device, hydraulic pipelines, and a hydraulic valve station. The hydraulic pump station primarily provides power to the tilting device, the furnace lid rotating device, and the furnace lining ejection device. It mainly comprises a hydraulic tank, a hydraulic pump, an emergency pump, a drive motor, a filtration system, various valves, and pressure gauges.
1. Hydraulic Pipeline Explosion-Proof Valve Design
When a pipeline bursts, the pipeline’s explosion-proof valve will automatically shut off the oil circuit. As a result, the tilted furnace body will remain suspended in mid-air and won’t fall rapidly, thereby preventing safety accidents.
2. Cylinder protective cover
The steel protective shield prevents the cylinder from being deformed by impacts from falling objects and avoids overheating of the oil caused by molten copper splashing.
3. One-way throttle valve design
The inlet is equipped with a throttling valve to prevent the furnace from suddenly dropping during tilting, allowing the molten copper in the furnace to be completely drained.
4. Induction furnace compensation capacitor bank
The enclosure of the compensation capacitor cabinet is made of channel steel and angle steel. It is equipped with a protective mesh frame, ensuring a robust overall structure and an aesthetically pleasing appearance. The cabinet houses built-in capacitors and is fitted with connecting copper bars, groove-type copper busbars, and water-circuit rubber hoses.
5. Medium-frequency induction furnace water-cooled cable
The connectors for water-cooled cables are crimped using a cold-pressing process that securely joins them to the copper stranded wires. This method ensures a robust connection with low contact resistance and does not damage the copper stranded wires. Each connector can withstand a certain amount of force when connected to the copper wire. 6T The above-mentioned tensile force. The outer jacket of the water-cooled cable is made of a specialized flame-retardant, fabric-reinforced flexible rubber hose. This type of rubber hose is difficult to ignite and boasts excellent strength. It can withstand... 0.45Mpa Water pressure without leakage or rupture.
6. Medium-Frequency Furnace Cooling System
The power supply is cooled by closed-circuit cooling tower water, while the furnace body is cooled by an open-circuit cooling tower (fiberglass cooling tower).
7. Induction Melting Furnace Power Transformer
The power transformer is used to step down the grid's... 10KV The high voltage is stepped down to a voltage suitable for the intermediate-frequency power supply. It is a dedicated rectifier transformer with oil-immersed self-cooling. In this electric furnace equipment set, the model of the power supply transformer is: ZS-12000 The primary voltage of the transformer 10KV , the secondary voltage is 1500V。 D/Y-11，d0 Wiring configuration: twelve-phase output. The transformer features a dual-winding design (equivalent to two transformers housed in a single enclosure), with a phase difference between the two windings. 30 °, This prevents interference between the two inverter systems and effectively addresses the issue of three-phase imbalance in the transformer, ensuring its normal operation.
To ensure the safety of the rectifier section and prevent impact on the power grid, rectifier transformers typically require a relatively high short-circuit impedance, with the short-circuit impedance ranging from... 6%--8% between them. A no-load manual voltage regulator switch is installed on the high-voltage side of the transformer, enabling it to... -5% ，0， +5% Three-level adjustment of output voltage.
The power transformer is equipped with a gas relay and an oil temperature gauge. Its output can be interlocked with the high-voltage switchgear; when the transformer triggers a gas alarm or the oil temperature exceeds the safe threshold, the high voltage will be automatically disconnected.
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