Photos of
Detailed introduction
Crucible-less design with immersion heater for precise temperature maintenance of molten aluminum · Capacities 300–1000 kg · ±1°C PID control
Primary Application
This electric holding furnace is specifically designed for maintaining molten aluminum at a precise temperature. It accurately controls the furnace chamber temperature to ensure the aluminum remains at the optimal temperature, effectively reducing temperature fluctuations and guaranteeing consistent melt quality. When used in die-casting cells, it supplies aluminum with uniform temperature and excellent fluidity, improving casting quality and reducing defects such as porosity and inclusions.
Main Features
Robust steel shell: Constructed from high-quality Q235 steel plates (6 mm thick) and structural channels, welded to form a cylindrical shape. The shell is designed for strength and can be lifted and transported as a complete unit. The exterior is coated with high-temperature silver-gray paint and features warning labels for safety.
Advanced non-crucible lining: The lining, in direct contact with molten aluminum, is made of non-stick alumina castable to resist chemical and thermal attack. This crucible-less design eliminates iron pickup and aluminum contamination, prevents slag adhesion, and extends service life. An intermediate anti-permeation castable layer prevents aluminum leakage.
High-efficiency insulation: A combination of ceramic fiber blankets, high-temperature calcium silicate boards, and nano-insulation materials minimizes heat loss to the outer shell, ensuring excellent thermal retention and energy savings.
Pneumatic lid with durable insulation: The lid is constructed with insulating materials and secured with stainless steel anchors for longevity and effective heat retention, reducing heat loss from the top. The lid is pneumatically actuated for easy access to the heating elements for maintenance.
Dual heating method (radiation + bottom immersion): In addition to top radiation heating, the furnace features an imported immersion heater protected by a gas-phase sintered silicon nitride tube. This tube offers excellent thermal conductivity, non-stick properties, and long service life, ensuring efficient and uniform heating of the molten aluminum.
Electrical Control System
Independent control cabinet: Dimensions 800×600×300 mm. The outer door houses the instrument panel with ammeter, voltmeter, temperature controller, and push-button switches. The inner door contains power switches, current transformers, thyristor power regulators, contactors, and other components for a neat and organized layout.
Advanced PID temperature controller: Features a liquid crystal display for easy setting of temperature and holding parameters. It includes multi-functional alarms. The thermocouple signal is amplified and processed, and the digital controller outputs a 4–20 mA signal to the thyristor regulator, which adjusts the firing angle to achieve control accuracy of ±1°C. The system offers thermocouple calibration, power limiting, and over-temperature alarm with interlock protection.
Dual thermocouple system: A K-type ceramic thermocouple (16 mm diameter) monitors furnace chamber temperature, while a right-angle thermocouple with silicon nitride protection tube (40 mm diameter) directly measures molten aluminum temperature for precise control.
Summary: This pool-type electric holding furnace combines a durable non-crucible lining, efficient immersion heating, and intelligent PID control to provide reliable, energy-saving, and high-purity aluminum holding for die-casting applications. It is the ideal solution for maintaining consistent melt quality and improving casting productivity.
Technical Specifications
Furnace dimensions, power rating, capacity, and tap-out opening size for each model.
| No. | Furnace Size (mm) | Power (kW) | Capacity (kg) | Tap-Out Opening (mm) |
|---|---|---|---|---|
| 1 | 2050×1660×1350 | 21 | 300 | 400×400 |
| 2 | 2250×1850×1350 | 21 | 400 | 400×400 |
| 3 | 2050×1850×1100 | 24 | 500 | 400×450 |
| 4 | 2150×1900×1100 | 27 | 600 | 400×450 |
| 5 | 2250×2000×1200 | 30 | 800 | 450×500 |
| 6 | 2350×2050×205 | 36 | 1000 | 500×550 |
* Note: Furnace size for Model 1000 is 2350×2050×205 mm (height dimension may be 2050 mm, please confirm actual drawings). Other capacities and custom designs are available upon request.
Frequently Asked Questions (FAQ)
What is the warranty period for this holding furnace?
We offer a one-year comprehensive warranty covering all manufacturing defects and key components (including the immersion heater, silicon nitride protection tube, control system, thermocouples, and refractory lining). Extended warranty options are available upon request.What makes this furnace different from a crucible-type holding furnace?
This is a crucible-less design with a monolithic castable lining. It eliminates the risk of crucible cracking and iron pickup, provides better thermal uniformity, and offers longer service life. The non-stick alumina lining prevents aluminum adhesion and slag build-up.How does the immersion heater improve performance?
The bottom-immersion heater, protected by a gas-phase sintered silicon nitride tube, provides direct and efficient heating to the molten aluminum. This ensures rapid heat transfer, excellent temperature uniformity, and prevents aluminum sticking to the heater surface, extending its service life.What temperature control accuracy can I expect?
The PID controller with thyristor power regulation achieves an accuracy of ±1°C. The system includes thermocouple correction, power limiting, and over-temperature alarm with interlock protection for reliable and safe operation.Is the furnace easy to maintain?
Yes. The furnace features a pneumatically operated lid for easy access to the heating elements and interior. The independent control cabinet is well-organized with clear indicators for quick diagnostics. Routine maintenance includes checking the heater and thermocouples.Does the furnace have safety features?
Yes. It is equipped with over-temperature protection, power limiting, thermocouple break detection, and a leakage protection system. The control panel includes alarms and interlocks to ensure safe operation in die-casting environments.Can the furnace be customized for larger capacities?
Absolutely. We offer custom engineering solutions for capacities above 1000 kg, as well as special tap-out dimensions, heater configurations, and control systems to meet specific die-casting cell requirements.
Why Choose This Pool-Type Electric Holding Furnace?
Whether you need a reliable aluminum holding furnace for die-casting cells or a high-purity melt maintenance system, this electric holding furnace delivers exceptional temperature stability and melt quality. Its immersion heater and non-stick lining ensure minimal maintenance and long service life. Ideal for foundries and die-casting plants seeking a robust, energy-efficient, and safe holding solution for molten aluminum.