The double shaft mixer, also known as a twin shaft concrete mixer, is a highly efficient device designed specifically for material mixing. It features two horizontally arranged shafts equipped with multiple sets of blades that perform strong shearing, pressing, and flipping actions on the materials. The double shaft mixer can mix the components of concrete efficiently and uniformly, offering advantages such as short mixing time, rapid discharge, and low energy consumption, meeting current environmental standards. During operation, it achieves thorough friction and high-frequency movement of materials, significantly improving mixing uniformity.
The double shaft mixer is widely favored in the construction machinery field because it is not only used for concrete production but also extensively applied in other areas such as casting mixing, dry powder production, glass mixing, precast components, blocks, ceramics mixing, and mortar trucks.
AGICO’s forced double shaft mixers guarantee efficient operation even under the most demanding conditions. Trusted by users in the market, their sales continue to grow steadily.
AGICO Double Shaft Mixer Product Highlights
Reliable Sealing, Eliminating Leakage Risks
Equipped with multiple shaft seal systems and air pressure sealing protection devices to effectively prevent material leakage at the shaft ends, ensuring long-term stable operation of the equipment.
Intelligent Monitoring System
Unique mixer monitoring technology that provides real-time status tracking of key components such as the reducer, discharge pump, and electric lubrication pump, enhancing management efficiency.
Efficient Lubrication Design
Customized electric lubrication pump with four independent pump cores, no need for distribution valves, accurately supplying oil to the four main shaft heads, improving lubrication efficiency and reducing maintenance costs.
Multi-point Water Spraying System
Multi-pipe, multi-channel layout for more uniform water spraying, effectively improving mixing uniformity and product quality.
Heavy-duty Design for More Stable Operation
Robust and durable overall structure suitable for high-intensity continuous working environments, offering strong stability and long service life.
Optional Intelligent Module System
Supports configuration of weighing systems, microwave detection systems, and other modules to meet the intelligent development trends of modern concrete mixing.
Wide Capacity Range
Available in models ranging from 1.5m³ to 6.0m³ to suit different scales of construction sites and production needs.
Core Advantages of the Double Shaft Mixer
Consistent and Reliable Mixing Performance
The counter-rotating double main shaft blades forcibly mix materials, generating stronger shear forces at the shaft crossing area. This ensures uniform mixing with short mixing times, ideal for projects requiring high-quality concrete.
Compact Structure and Easy Maintenance
Designed with a simple, compact structure for long service life. Key components are easily accessible for maintenance, reducing daily upkeep workload and operational costs.
Modular System Configuration, Flexibly Adapted to Various Conditions
Offers a variety of accessories and combinations based on customer needs, including optimized feeding sequences, discharge door designs (flap-type, split-type, etc.), and motor drive options (variable frequency or pole-changing speed control), meeting personalized process requirements.
Customizable Drive System
Equipped with suitable drive power solutions tailored to different maximum torque demands, ensuring mixing performance while improving energy efficiency.
Working Principle of the Double Shaft Mixer
Equipment Type
AGICO’s JS double shaft mixer is a type of forced concrete mixing equipment. During operation, the mixing drum remains stationary while the internal mixing shafts and blades perform the mixing task. This equipment is widely used in projects with high requirements for concrete mixing quality.
Discharge Methods
The JS mixer offers three discharge options: hydraulic discharge, pneumatic discharge, and manual discharge. For urgent construction needs, pneumatic discharge is faster than hydraulic discharge. Hydraulic discharge ensures smooth unloading even when air pressure is insufficient. Manual discharge is generally reserved as an emergency backup and the operation lever should be disengaged during normal use to avoid accidental injuries.
Mixing Principle and Structural Features
The double shaft mixer uses two horizontally arranged mixing shafts, each equipped with helically arranged mixing arms and blades. During operation, the two shafts rotate in opposite directions, driving the blades to shear, squeeze, and flip the material inside the drum, achieving forced mixing. This structural design promotes thorough mixing through intense relative movement, improving mixing uniformity.
The 3D mixing principle is a key technical advantage of the JS mixer. Unlike the vortex motion of typical mixers, this system generates intense material exchange in the interface zone through the opposing helical movement of the two shafts, shortening mixing time and reducing energy consumption. Throughout the process, all materials remain in constant motion, ensuring efficient, energy-saving, and uniform mixing results.
The Variation of Mixing Uniformity During the Mixing Process
Pre-Startup Checklist
- Verify that the nameplate parameters meet project requirements (output, frequency, voltage, mixing capacity, etc.).
- Confirm that the equipment was not damaged during transportation and that cables have no exposed copper wires.
- Ensure all accessories are complete, the gearbox is filled with lubricating oil, and the V-belts are properly installed.
- Conduct a no-load test run after installation to ensure normal operation before starting production.
Raw Material Usage and Operation Guidelines
1. Applicable raw materials: capable of mixing stiff, plastic, flowable, and lightweight aggregate concrete and mortar.
2. Recommended aggregate size: ≤150mm, with aggregates sized 120–150mm not exceeding 10% of the total.
3. Stagnation handling: if the transport vehicle is delayed for over 20–30 minutes, perform a simple cleaning of the mixing drum to prevent concrete from setting.
4. Daily Maintenance Key Points: keep equipment clean to prevent residue buildup: Remove impurities and leftover material from the mixing drum daily to avoid concrete hardening and damaging the equipment.
5. Check lubrication system to ensure smooth operation: Inspect lubrication points and oil levels daily, add grease as needed, focusing on main shaft seals, gearbox, discharge door bearings, and other critical parts.
6. Regularly monitor electrical and control systems: Check that the motor, gearbox, and control cabinet operate normally; watch for unusual noise, overheating, or vibration. Stop the machine immediately if abnormalities occur and perform repairs.
7. Ensure good equipment condition before mixing: Run a water test for 1–2 minutes before each shift, checking clutch and brake reliability; thoroughly clean the mixing drum, pipelines, and equipment exterior after each shift.
8. Prohibit idling operations: Never run the mixer empty while the blades are immersed in liquid to prevent equipment damage and safety hazards.
9. Solid foundation to prevent resonance: Install the mixer on a sturdy concrete foundation to ensure secure fixation and avoid loosening caused by vibration.
10. Bolt tightening inspection: Regularly check foundation bolts, adjustment screws, and main engine cabin doors to ensure no looseness and prevent displacement during operation.
Cleaning and Maintenance Recommendations
- Cleaning frequency: Clean at least once per production cycle; conduct comprehensive cleaning after production ends.
- Cleaning method: Add an appropriate amount of water and small stones into the mixing drum, mix for 5–10 minutes, then drain completely to remove residue and standing water. High-pressure water guns can be used for thorough cleaning inside and outside the drum.
- Precautions: Always cut off power and air supply before manual cleaning, lock the control room, and never strike the mixing shafts, arms, or blades.
