CTS - 4 | Twin Shaft Concrete Mixer

CTS-4 Twin Shaft Mixer is a central-mix class machine in the CONSTMACH CTS range, sized for plants whose output is measured in hundreds of cubic metres per day. It accepts a charging volume of 6,000 lt, produces 5,000 lt of fresh concrete and discharges 4,000 lt of compacted concrete in each batch. At four cubic metres per cycle it is built for large central ready-mix plants, roller-compacted concrete (RCC) and dam placements, and high-volume precast factories where the mixer must never be the limiting station on the line.

The CTS-4 is driven by two 75 kW motors, giving a combined 150 kW of mixing power. That torque is what lets the machine turn over a full 6,000 lt charge of stiff, low-water RCC or dense structural concrete and restart under load through hour after hour of continuous casting. The two horizontal shafts counter-rotate, throwing material from each side toward the centre where the streams meet; injected water is absorbed rapidly and the cement slurry coats all aggregate uniformly, producing a homogeneous 4 m³ batch in the short cycle that makes twin-shaft mixers the standard choice for high-volume central plants.

Wear protection is built for sustained heavy duty. The side body and the main body both use 25 mm wearing plates, and the mixing arms carry 30 mm wearing plates at the points of greatest abrasion. The 25 mm body liners are notably heavier than those on the smaller CTS models, reflecting the large mass of aggregate that passes through the trough on every cycle in RCC and aggregate-rich mixes; thicker liners mean fewer changeouts and more productive hours between maintenance stops. All liners remain individually replaceable, so the abrasion zones are renewed without retiring the trough.

An automatic lubrication system meters grease to the four shaft bearings and seals on a fixed schedule. On a 150 kW machine running continuously, reliable lubrication of the heavily loaded bearings is the principal safeguard against unplanned downtime, and automating it removes the risk of missed manual greasing during long shifts. A hydraulic discharge door empties the 4 m³ batch rapidly so the trough is ready to recharge; at this batch size, fast and clean discharge is critical to holding the cycle time that the plant's hourly target depends on.

A maintenance door safety switch interlocks the inspection door with both drives, halting both shafts whenever the door is opened. On a machine of this power, a positive interlock that prevents either shaft from turning during cleaning or liner inspection is essential for crew safety.

In service, the CTS-4 anchors large central ready-mix plants supplying major infrastructure, RCC plants for dams and large pavements, and heavy precast factories casting bridge girders, large panels and tunnel segments. Its 4 m³ batch and twin 75 kW drives sit above the high-output CTS-3 and just below the largest CTS-5, making it the choice for projects that demand central-mix volumes but not quite the maximum frame. Integrated with CONSTMACH heavy-duty weighing, dosing and conveying systems, the CTS-4 forms the mixing heart of a central concrete production plant.