Automatic Coated Sand Mixer for Foundry Sand Systems

The M Series Shell Sand Mixer is a high-efficiency, intelligent mixing machine specifically designed for the hot-process shell sand production. It is widely used in core making for precision castings such as automotive components, engine blocks, hydraulic valves, pump housings, and pipe fittings. Featuring high-speed dual-rotor agitation + oil-bath/electric heating + automated control, it enables rapid, uniform, and controllable mixing of sand, resin, and hardener, ensuring a complete, dense resin coating on sand grains—significantly improving core strength, dimensional accuracy, and surface finish to meet high-quality shell sand production requirements.

Available in models M-300, M-500, M-800, M-1000, the M Series offers batch capacities from 30 kg to 1000 kg. It supports manual, semi-automatic, and fully automatic operation modes and can be seamlessly integrated with sand heaters, cooling/crushing systems, and conveyors to form a complete shell sand production line.

The M Series uses a three-stage mixing process: "hot sand + resin + cold hardener", ensuring resin fully coats hot sand and hardener is added precisely after cooling to prevent premature curing:

 Heating & Pre-Mixing
Pre-dried sand is heated to 120–140°C and fed into the mixer. Dual rotors spin at 150–300 rpm, rapidly tumbling sand for uniform temperature.

Uniform Mixing, Stable Quality
Symmetrical dual-rotor with helical blades combines forced shearing and tumbling—mixing uniformity ≥98%, ensuring full coating on every sand grain.

Precise Temperature Control, Process Flexibility
Multi-point thermocouples + PID control monitor sand temperature in real-time, accuracy ≤±3°C. Supports multi-stage temperature profiles for different resin systems.

High Automation
Full-auto mode controls the entire process: sand feeding → heating → resin addition → cooling → hardener addition → mixing → discharge, minimizing human error and improving consistency.

Robust & Wear-Resistant
Mixing chamber and rotor blades made of wear-resistant alloy steel (ZGMn13) or overlay welding, impact- and wear-resistant, long service life. Reliable shaft sealing prevents resin leakage.

User-Friendly, Easy Maintenance
10" HMI touchscreen for intuitive parameter setting and self-diagnosis. Top quick-opening cover for easy cleaning. Centralized lubrication points for simple maintenance.

Shell core production for automotive engine blocks, heads, intake manifolds

Precision core making for hydraulic valves, pumps, and fittings

High-precision thin-wall cores for aerospace and defense

Mixing unit for shell sand reclamation systems

Small-scale mixers for lab or pilot production (M-300/M-500)

Qingdao Dingli Machinery Co., Ltd. is a company specializing in the production of casting machinery equipment. It mainly manufactures equipment for casting clay sand, resin sand, coated sand, wet sand drying, lost foam casting, sodium silicate sand, etc. It can undertake various turnkey projects, including the design, manufacturing, installation and commissioning of mechanical sand processing. Our factory has strong technical strength and advanced processing equipment. We have long-term and close technical cooperation with many senior experts and scholars from domestic universities and research institutions. We can provide users with high-performance, reliable products and satisfactory services.
Our company adheres to the principles of promoting enterprise development through technology, prioritizing quality, continuous improvement and customer satisfaction. We are willing to sincerely cooperate with friends from all walks of life to achieve common prosperity.
Our company mainly undertakes the following projects:
20-180t/h mechanized clay sand processing production line and single machine equipment turnkey project.
Annual production of 1000 to 20,000 tons of consolidated resin sand casting mechanized production line and single machine equipment turnkey project.
Annual production of 3,000 to 10,000 tons of hot processing coated sand complete equipment and single machine equipment turnkey project.
Annual production of 3,000 to 7,000 tons of hot coating sand regeneration complete equipment and single machine equipment turnkey project.
5-15t/h sodium silicate mechanical production line and single machine equipment turnkey project.
5-30t/h three-stage sand drying equipment and single machine equipment turnkey project.
5-40t/h lost foam casting complete equipment and single machine equipment turnkey project and other types of shot blasting cleaning equipment, lifting equipment, conveying equipment, cooling equipment, magnetic separation equipment, environmental protection dust removal equipment.
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