The CONSTMACH CSS-2 single shaft mixer is the 2 m³ flagship of the single shaft line, intended for high-throughput central ready-mix plants. Its applications, output, installation requirements and servicing are set out below.
Where the CSS-2 Is Used
This capacity is selected where large, frequent batches are needed to sustain continuous supply. Typical settings include:
- Central ready-mix plants feeding fleets of transit mixers on major construction programmes
- Large infrastructure projects such as highways, bridges, dams and ports requiring sustained concrete volume
- High-rise and industrial building sites with heavy daily pour schedules
- Regional batching hubs supplying multiple delivery routes from a single location
What It Produces
Each cycle delivers 2,500 litres of fresh concrete, or 2,000 litres compacted, across standard structural and ready-mix designs. The single shaft action gives reliable homogeneity for plastic and semi-dry concrete at high volume; for large-batch dry-cast or high-strength specialist work, a planetary mixer remains the more suitable mixing technology.
Installation and Power
The CSS-2 requires a three-phase supply matched to its drive, and where the twin-motor option is specified the supply and control panel must serve both motors. The mixer is a substantial mass and is mounted high in the plant tower above the discharge point, so foundations and supporting steelwork must be engineered for the static and dynamic loads of a full 2 m³ batch. Generous access for liner handling should be planned given the chamber size.
Maintenance and Wear Parts
The reinforced wear package, 15 mm Hardox 450 side plates, 20 mm Ni-Hard main body plates and 30 mm Ni-Hard arm plates, is designed to lengthen replacement intervals under heavy duty, with each liner replaceable individually. The automatic lubrication system services the shaft bearings during operation, while reservoirs, seals and lines need scheduled checks. The twin-motor option supports continued running on one drive during maintenance, but both motors and the safety switch should be inspected on a regular programme.
Comparison with Other Mixer Types
At 2 m³ the CSS-2 offers the most economical large-batch route for general concrete. A pan mixer is not typically built at this scale and remains a small-batch precast and laboratory tool, while a 2 m³ planetary mixer provides higher consistency and cement saving for demanding mixes at significantly greater cost and installed power. The CSS-2 is the choice for producers whose priority is high-volume ready-mix economy.
Cycle and Throughput Considerations
At 2 m³ the mixer moves a large mass each cycle, so the surrounding plant must be able to weigh, dose and deliver materials fast enough to keep charging time short. The twin-motor option supports sustained running, but realised throughput still depends on aggregate weighing capacity, cement screw rates and water metering. A central plant is normally engineered around the CSS-2's batch size so that charging, mixing and discharge form a continuous cadence feeding a fleet of transit mixers without the mixer waiting for materials.
Because of its size and long running hours, the CSS-2 also benefits from planned wear monitoring: tracking liner thickness lets producers schedule replacement during planned stoppages rather than reacting to failures during peak production.
CONSTMACH provides foundation loads, layout drawings and spare-part planning to integrate the CSS-2 into a central batching plant configuration.
