Precast Concrete Hollow Core Slab Extruder Machine

The precast hollow core slab extruder machine is a semi-automated device designed for the continuous production of concrete precast hollow core slabs. Its working principle combines extrusion molding technology and vibration compaction technology to manufacture concrete hollow-core slabs.

The Concrete slab extrusion machine typically consists of the following core components:

• Hopper: Stores dry-mix concrete raw materials (with a low water-cement ratio).
• Screw  feeding system (Auger): Transports and compacts concrete into the molding chamber via rotational extrusion.
• Molding System (Molding Chamber): A shaped cavity designed to form the cross-sectional profile of the slab (e.g., hollow cavities, ribs).
• ·Vibration System: Equipped with high-frequency vibrators to eliminate air bubbles and enhance compaction density.
• ·Travel System: Drives the machine along a track at a constant speed to enable continuous production.

Step 1: Feeding and Extrusion

• Dry-mix concrete (cement, aggregates, etc.) is fed into the screw augers from the hopper.
• The rotating auger extrudes and compacts the concrete forward, shaping it into the predefined cross-sectional profile (e.g., hollow-core slab) under the constraint of the mold.

Step 2: Vibration Compaction

• ·During extrusion, high-frequency vibrators synchronously activate to rearrange concrete particles, expel air, and improve compaction density and strength, preventing defects such as honeycombing or surface voids.

Step 3: Continuous Molding

• · The hollow core extruding machine moves uniformly along the track, while the combined action of extrusion and vibration forces the concrete to exit the mold continuously, forming an elongated slab blank.

Step 4: Cutting and Curing

• ·The slab is segmented into required lengths using an automatic or manual cutter after initial setting.
• The formed slabs undergo steam curing or natural curing to achieve the target strength.

• ·Dry-Mix Concrete: Utilizes low water-cement ratio concrete to ensure rapid shape retention post-extrusion.
•  High-Efficiency Continuous Production: Eliminates the need for formwork, enabling single-pass production of slabs up to tens of meters in length, ideal for standardized mass production.
• · Integrated Structural Molding: Directly forms structural features (e.g., hollow cavities, reinforcement ribs) via mold design, minimizing post-processing.

Primarily used to manufacture precast components such as hollow-core slabs, hollow core wall panels ,truss-reinforced slabs, and composite slabs. Widely applied in prefabricated buildings for its advantages in efficiency, cost-effectiveness, and consistent quality.