500 kW Rated Power 0.8-Ton Capacity Medium Frequency Induction Melting Furnace

Product Specification

1. Product Overview

This steel-shell hydraulic tilting medium frequency induction melting furnace is specifically designed for rapid melting and holding of aluminum alloys and other non-ferrous metals. Featuring KGPS thyristor medium frequency power supply (500kW/1000Hz) with parallel inverter circuit, fully digital control board, and closed-loop feedback system, it offers fast melting speed and high efficiency. Typical applications include centralized melting and liquid supply stations for aluminum die-casting, sand casting, and gravity casting production lines.

2. Industry Challenges & Root Cause Analysis

Low melting efficiency and high energy consumption:Traditional resistance or fuel-fired heating methods have low thermal efficiency – slow heating with high unit energy consumption. Root cause: low heat transfer efficiency of heating methods with significant heat loss.

Poor power supply stability and high failure rate:Medium frequency power supplies are prone to start failure and over-current/over-voltage protection trips. Root cause: outdated control circuit technology and lack of comprehensive protection systems.

Inadequate furnace insulation and safety protection:Coil insulation aging and lining damage create leakage risks – potential safety accidents. Root cause: lack of leakage detection systems and reliable coil insulation processes.

Inconvenient tilting and pouring operation:Manual or mechanical pouring is labor-intensive with imprecise liquid output control. Root cause: lack of hydraulic tilting mechanism and remote/foot pedal control.

Incomplete cooling system configuration:Improper cooling water temperature and pressure control causes overheating shutdowns and shortened service life. Root cause: lack of dedicated closed-loop circulating cooling systems.

3. Solution

3.1 High-Efficiency Medium Frequency Induction Melting System:Rated power 500kW – output frequency 1000Hz – melting rate 0.8 tons/furnace – melting time ≤60min. Thyristor parallel inverter circuit, 3-phase 6-pulse rectification – power factor ＞0.9 – start success rate 100%. Fully digital control board with dual voltage/current closed-loop feedback – multiple protections (over-current, over-voltage, under-current, under-voltage, water shortage, phase loss) – stable and reliable operation.

3.2 Steel-Shell Hydraulic Tilting Furnace:Steel frame structure + hydraulic tilting system – 2 hydraulic cylinders for tilting (0-95°) – reset by furnace body weight. Hydraulic station with dual motors and dual pumps (one active, one standby – automatic switching) – remote console – smooth and stable pouring without shock or creeping – speed adjustable – can stop at any position.

3.3 High-Performance Induction Coil & Magnet Yoke:Coil material T2 copper tube (5mm thickness) – designed and optimized with dedicated software based on electromagnetic field principles – power deviation ≤5%. Advanced inter-layer insulation process – inner wall sprayed with imported high-temperature insulating materials – equipped with leakage alarm system. Magnet yoke: cold-rolled silicon steel sheets + stainless steel clamps – reduces magnetic flux leakage – prevents furnace body heating – improves electrical efficiency.

3.4 Closed-Loop Circulating Water Cooling System:Closed-loop circulating cooling system (main unit + 2 water tanks + control box) – power supply cooling ≥12m³/h (outlet ≤35℃) – furnace cooling ≥20m³/h (outlet ≤45℃) – water pressure 0.15-0.35MPa. Closed-loop circulation prevents scaling and corrosion – extends equipment service life.

3.5 Graphite Crucible & Fast Furnace Lining:Graphite crucible – service life approximately 4-6 months. 10-15mm refractory material sprayed inside coil – enables fast furnace lining – prevents thermal deformation affecting service life. Optional lining ejection mechanism – quickly removes damaged lining for fast rebuilding.

3.6 Leakage Detection & Safety Protection:Leakage detection system (bottom electrode + alarm controller) – real-time lining monitoring – automatic alarm and power cut-off on abnormality. Power supply with over-current, over-voltage, under-current, under-voltage, water shortage, phase loss protections – comprehensive equipment and operator safety.

4. Technical Specifications

5. Selection Guide

5.1 Recommended Scenarios

• Centralized melting and liquid supply for aluminum die-casting workshops

• Rapid aluminum liquid supply for gravity casting and sand casting lines

• High-productivity aluminum melting stations requiring fast melting

5.2 Key Selection Considerations

1. Furnace capacity: Confirm single-batch aluminum demand ≤0.8 tons (max 0.96 tons)

2. Melting efficiency: Melting time ≤60min/furnace – verify meets continuous production cycle requirements

3. Power supply: User to provide 3-phase 380V/500kW power capacity

4. Cooling water: User to provide closed-loop cooling system (or optional from our side) – total flow ≥32m³/h

5. Hydraulic station installation: Reserve installation space and pipeline interface

6. FAQ

Q1: What are the advantages of induction melting over resistance heating?

A: Induction heating generates eddy currents within the metal itself – high thermal efficiency – fast melting (≤60min/furnace) – saves 20-30% energy compared to resistance heating. The stirring effect ensures uniform aluminum composition – improves casting quality.

Q2: How is furnace leakage prevented?

A: Leakage detection system (bottom electrode + controller) monitors lining resistance changes in real-time. When cracks or damage allow aluminum penetration, the system automatically alarms and cuts power – prevents accident escalation.

Q3: How reliable is the hydraulic tilting system?

A: Hydraulic station with dual motors/pumps (one active, one standby) – automatically switches to standby pump on main pump failure – ensures continuous production. Remote console with infinitely variable speed control – smooth pouring with precise positioning.

Q4: Why is a closed-loop cooling system necessary?

A: Medium frequency power supply and induction coil generate significant heat during operation. Closed-loop system uses purified or softened water – prevents scaling and corrosion – ensures cooling efficiency – extends power module and coil service life.

Q5: What is the crucible service life and how to extend it?

A: Graphite crucible approximately 4-6 months under normal conditions. Key to extending life: ① avoid rapid heating/cooling (thermal shock); ② regularly clean residue from crucible walls; ③ avoid prolonged high-temperature holding; ④ use dedicated crucible tongs for handling.