1500kg Capacity Electric Resistance Aluminum Melting Furnace with Hydraulic Tilting and PID Intelligent Temperature Control

1. Product Overview

This crucible-type electric resistance aluminum melting furnace features a hydraulic tilting structure, specifically designed for melting and holding of low-melting-point non-ferrous metals and alloys (aluminum alloys, zinc alloys, etc.). The furnace body is a cylindrical steel plate structure with a composite insulation lining of aluminum silicate fiber + lightweight refractory brick + vermiculite powder, equipped with a Morgan graphite crucible and PID intelligent temperature control system. Typical applications include centralized melting and holding 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 heating methods have low thermal efficiency – slow heating with high unit energy consumption. Root cause: insufficient furnace lining insulation and irrational heating element layout.

Insufficient melt temperature control accuracy:Aluminum liquid temperature fluctuations affect casting quality consistency. Root cause: lack of PID intelligent regulation and dual-temperature (chamber + molten aluminum) independent monitoring.

Severe aluminum oxidation and hydrogen absorption:Aluminum liquid exposed to air for extended periods produces oxide inclusions and absorbs hydrogen – reduces casting density. Root cause: poor furnace cover sealing and lack of protective atmosphere.

Laborious tilting and pouring operation:Manual or mechanical pouring is labor-intensive with safety risks. Root cause: lack of hydraulic tilting mechanism and remote/foot pedal control.

Short crucible life and frequent replacement:Crucibles are prone to thermal shock cracking – frequent replacement increases operating costs. Root cause: improper crucible material selection and lack of standardized usage/maintenance guidance.

3. Solution

3.1 High-Efficiency Composite Insulation Lining:Furnace wall insulation: aluminum silicate fiber blocks + superlight refractory bricks (0.6g/cm³) + vermiculite powder filling – furnace bottom: once-forming castable material – high strength, long service life. Excellent insulation performance – empty furnace heating time ≤3h – low heat loss and energy consumption.

3.2 PID Intelligent Dual-Temperature Measurement Control System:Equipped with Taiwan Taisee intelligent temperature controllers (2 units) + power regulator (SCR) – control accuracy ±3℃ (standard conditions). Dual thermocouple configuration – one measuring chamber atmosphere temperature, the other measuring actual aluminum liquid temperature (with silicon carbide protection tube) – enables precise control of actual aluminum temperature – prevents over/under heating.

3.3 Hydraulic Tilting System:Hydraulic tilting mechanism – smooth and controllable pouring – precise liquid output control. Significantly reduces labor intensity and improves safety compared to manual pouring.

3.4 High-Purity Heating Elements:Heating elements made of OCr27A17MO2 high-resistance electric heating alloy wire – operating temperature 850℃ – excellent oxidation resistance and long service life. Single-zone heating control – power 200kW – melting rate approximately 450-500kg/h.

3.5 Morgan Brand Graphite Crucible:Morgan brand graphite crucible – high thermal conductivity, excellent thermal shock resistance – service life ≥6 months (depending on operating conditions). Cast iron pressing ring secures crucible for stable operation.

3.6 Emergency Drain Hole Design:Emergency drain hole at bottom of side wall – prevents molten aluminum overflow in case of leakage – protects equipment and operator safety.

4. Technical Specifications

5. Selection Guide

5.1 Recommended Scenarios

• Centralized melting and holding for aluminum die-casting workshops

• Aluminum liquid supply for gravity casting and sand casting lines

• Melting of zinc alloys and other low-melting-point non-ferrous metals

5.2 Key Selection Considerations

1. Furnace capacity: Confirm single-batch aluminum demand ≤1500kg

2. Melting rate: 450-500kg/h – verify meets continuous production cycle requirements

3. Power supply: User to provide 3-phase 5-wire 380V/200kW power and 220V control power

4. Tilting operation: Hydraulic system requires installation space and pipeline interface from user

5. Crucible maintenance: Crucible life depends on operating conditions – regular inspection and replacement recommended

6. FAQ

Q1: What materials can the furnace melt?

A: Primarily suitable for aluminum, aluminum alloys, zinc alloys, and other low-melting-point non-ferrous metals. Not recommended for high-melting-point metals like copper or iron to avoid damaging heating elements and crucible.

Q2: Why are two thermocouples configured?

A: One measures chamber atmosphere temperature, the other is immersed in molten aluminum to measure actual liquid temperature (with SiC protection tube against corrosion). Actual aluminum temperature directly reflects melt condition – ensures precise holding temperature control – prevents over/under heating affecting casting quality.

Q3: What are the advantages of hydraulic tilting?

A: Smooth and controllable hydraulic tilting – continuously variable speed pouring – precise liquid output control – eliminates splashing and burn risks from manual pouring – significantly reduces operator labor intensity.

Q4: What is the crucible service life and how to extend it?

A: Morgan graphite crucible ≥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.

Q5: How is the emergency drain hole used?

A: Located at the bottom of the side wall – in case of crucible rupture or leakage causing molten aluminum overflow, the drain hole provides a safe path for liquid discharge into the pit – prevents accident escalation – protects equipment and personnel.