Twin-shaft Concrete Mixer

What is a Twin-shaft Concrete Mixer?

Twin-shaft concrete mixer (mainstream model: JS series) is a forced intermittent mixing equipment. Its core structure consists of two parallel horizontal mixing shafts rotating in opposite directions, with mixing arms and blades installed alternately on the shafts. Driven by shaft rotation, the blades form a 3D composite movement of convection + shear + circulation, forcibly mixing aggregates, cement, water, additives and other materials in the mixing drum to achieve uniform mixing in a short time.

When to Choose a Twin-shaft Concrete Mixer?

• Pursue mixing efficiency and uniformity: Commercial concrete batching plants, precast component factories (require mass production of high-uniformity concrete);
• Mix special materials: Stiff concrete (low water-binder ratio), high-strength concrete (C60 and above), lightweight aggregate concrete, fiber concrete;
• Meet project scale and capacity demand: Large-scale infrastructure projects (roads, bridges, water conservancy projects), requiring continuous and large-batch discharge;
• Require high material adaptability: Large aggregate size (max. adaptable 180mm), complex material composition (with various additives);
• Strict quality control: Low discharge residue rate (≤0.5%) to avoid cross-contamination between different batches of concrete.

Core Product Advantages of Twin-shaft Concrete Mixer

Applications & Scope of Application

• Produce commercial concrete (core host of commercial concrete batching plants);
• On-site concrete mixing for large-scale projects (bridges, tunnels, high-speed railways, water conservancy hubs, ports and wharves);
• Production of precast concrete components (precast beams, precast slabs, pipe piles, sleepers);
• Preparation of special concrete (high-strength, corrosion-resistant, freeze-thaw resistant concrete).

Scope of Application

• Industries: Construction engineering, municipal engineering, water conservancy engineering, transportation engineering, precast component factories;
• Scenarios: Fixed batching plants, mobile batching plants, temporary on-site mixing for projects;
• Materials: Sand and gravel aggregates (particle size ≤180mm), cement, fly ash, mineral powder, water, various additives (water reducers, retarders, etc.).

Components

• • Mixing System: Mixing drum (welded sealed structure), two horizontal mixing shafts, mixing arms, mixing blades (core moving parts);
  • Drive System: Motor, reducer, coupling (dual-motor drive, balanced power distribution);
  • Discharge System: Hydraulic cylinder, discharge door (adjustable discharge speed, sealed against leakage);
  • Lubrication System: Automatic centralized lubrication device (ensures lubrication of bearings and shaft end seals);
  • Control System: Control cabinet;
  • Sealing System: Dual shaft end seals (prevent material leakage and dust ingress).

Technical Parameters

Working Process

1. Preparation Stage: Start the equipment, check lubrication, sealing, discharge door and other key parts to confirm no abnormalities;
2. Feeding Stage: Feed aggregates, cement, fly ash and other dry materials into the mixing drum through the batching machine according to the preset ratio, then add water and additives;
3. Mixing Stage: Start twin mixing shafts, blades drive materials to perform 3D movement and forcibly mix evenly;
4. Discharge Stage: Hydraulic system opens the discharge door to unload the mixed concrete, and close the door after discharging;
5. Cycle / Cleaning: Enter the next mixing cycle, or clean residual materials on the inner wall of the mixing drum and blades after shutdown.

Operation Notes

Before Startup

• Check for residual materials and debris in the mixing drum to ensure no jamming;
• Check lubricating oil level, hydraulic oil level, integrity of shaft end seals, and proper closing of discharge door;
• Confirm normal function of control system and emergency stop button, and reliable grounding protection.

During Operation

• Strictly prohibit over-ratio and over-size feeding to avoid motor overload or blade damage;
• Observe equipment operation sound; stop immediately for inspection if abnormal noise or severe vibration occurs;
• Prohibit personnel from approaching the mixing drum and discharge port, and never put hands/tools into the rotating mixing drum;
• If power off during mixing, manually clean materials in the drum before restarting; no-load startup is mandatory.

After Shutdown

• Clean the mixing drum, blades and discharge door in time to avoid concrete solidification and adhesion;
• Turn off power, air supply / hydraulic power, and complete equipment cleaning and maintenance records;
• For long-term shutdown, drain lubricating oil / hydraulic oil, conduct anti-rust treatment and cover the equipment.

Maintenance Taboos

• Cut off power and hang a “No Closing” warning sign during maintenance and parts replacement;
• Do not adjust mixing shaft speed or hydraulic system pressure at will; only professional personnel are allowed to operate;
• Replace wearing parts (blades, lining plates) in time when wear exceeds 1/3 to avoid main shaft damage.

Price & Customization Service

The price of twin-shaft concrete mixer is affected by model, configuration, accessory material, customization demand and other factors. Please contact us to confirm accurate information and get the latest unit price.

Personalized Customization Supported:

• Configuration customization: Variable frequency motor / ordinary motor, imported seal / domestic seal, manual / fully automatic control system;
• Structure customization: Thickened mixing drum material, adjusted discharge door size, adapted to special aggregate particle size;
• Scenario customization: Adjusted installation size for fixed batching plants / mobile batching plants.

Recommended Related Products

• Supporting Equipment: Concrete batching machine, cement silo, screw conveyor, batching plant control system, concrete mixer truck;
• Same Series Products: Vertical planetary concrete mixer, mobile concrete batching plant;
• Accessories & Consumables: Mixing blades / lining plates, seals, lubricating oil, hydraulic cylinder.