Hollow Bricks Machine

The Hollow Bricks Machine is purpose-built to address one of the most persistent challenges in concrete masonry: producing lightweight, structurally sound units that reduce material consumption without compromising strength. Unlike solid brick equipment, this machine must manage the complex interplay between cavity formation, wall thickness consistency, and vibration energy distribution. Our Hollow Bricks Machine resolves these competing demands through precision-engineered core systems and intelligent process control, delivering hollow blocks that consistently meet international standards while maximizing material efficiency.

The Cavity Geometry Challenge

The defining characteristic of hollow block production is the internal cavity—and the core assemblies that form it. Our Hollow Bricks Machine features precision-engineered core systems that ensure consistent cavity geometry across every production cycle:

• Core taper optimization: Internal cores are manufactured with a precision taper (typically 1.5°–2.0°) that enables smooth demolding without damaging cavity surfaces. This design minimizes friction during ejection, reducing wear on both cores and the finished product.

• Interchangeable core configurations: The machine supports core sets for 2-cavity, 3-cavity, and 4-cavity blocks, enabling manufacturers to produce the specific hollow block configuration required for different structural applications.

• Multi-stage demolding sequence: The machine employs a controlled core retraction sequence that allows material relaxation before final ejection, reducing surface cracking and edge chipping.

This core system precision enables consistent wall thickness uniformity within ±1.0mm across all cavities—a critical requirement for hollow block structural performance and construction site acceptance.

Comparing Hollow vs. Solid Production

The economic advantage of hollow block production is measured in material savings. Our Hollow Bricks Machine maximizes this advantage through precise cavity formation that achieves the optimal balance between void volume and structural integrity:

These material savings are achieved without compromising structural performance. Our Hollow Bricks Machine produces blocks with face shell thicknesses of 20–30mm and compressive strengths of 15–25MPa, meeting or exceeding ASTM C90 and BS EN 771 requirements for load-bearing applications.

The Physics of Hollow Block Compaction

Hollow block compaction presents a unique physics challenge: the internal cavities create an irregular material distribution that can lead to density variations and weak zones. Our Hollow Bricks Machine addresses this through zoned vibration energy distribution that delivers the right compaction energy to each section of the block:

• Cavity zone processing: Lower vibration amplitude (0.3–0.5mm) prevents core deformation while achieving face shell compaction.

• Web zone processing: Higher amplitude (0.8–1.0mm) for full compaction in the narrow material sections between cavities.

• Surface zone processing: Intermediate amplitude (0.6–0.8mm) delivers a dense, smooth finish.

This zoned approach achieves uniform density distribution across the block, with variation typically below 3%—significantly better than conventional machines where variation can exceed 8%. The result is hollow blocks with consistent strength characteristics across all sections.

Production Capacity & Mold Flexibility

The Hollow Bricks Machine is designed for high-volume production with rapid mold changeover capability. The ZS-QT8-15 series, for example, achieves cycle times of 15–18 seconds with production capacities reaching 15,360 hollow blocks per day (390×190×190mm) or 76,800 standard bricks per day :

Control & Automation: PLC-Integrated Production

Modern Hollow Bricks Machines integrate comprehensive automation that ensures consistent quality and minimizes operator dependency. The ZS-QT series uses Japan Mitsubishi PLC control systems with Delta Touch Screen interfaces :

• Visualization screen: Easy operation with intuitive interface that allows operators to set up, update, and amend production parameters to maximize output .

• Dynamic status display: Real-time monitoring of system status with automatic troubleshooting and warning notices .

• Safety interlocks: Automatic-locking function prevents mechanical accidents caused by operational mistakes .

• Proportional valve control: High-dynamic proportional and directional valves automatically adjust oil flow and pressure as per specific working requirements .

The machine also incorporates multi-shaft rotating and compulsory feeding, which improves block density and intensity while reducing feeding time .

Hollow Bricks Machine Comparison

The following comparison evaluates our Hollow Bricks Machine against common alternatives:

Practical Answers for Decision Makers

Q1: What hollow block sizes can the machine produce?
The machine supports block heights from 50mm to 300mm, with common sizes including 400×200×200mm, 390×190×190mm, 400×150×200mm, and custom configurations. Quick mold changeover enables rapid switching between sizes.

Q2: What is the typical wall thickness achievable?
The machine maintains face shell and web thickness within ±1.0mm tolerance. Minimum wall thickness capability is 20mm, with typical production thicknesses ranging from 20–30mm depending on application requirements.

Q3: Can the machine produce both hollow and solid products?
Yes. By changing molds, the same machine produces hollow blocks, solid bricks, multi-hole bricks, paving stones, and curb stones. The hydraulic and vibration parameters adjust based on mold configuration to ensure optimal compaction .

Q4: What is the expected product strength?
The machine produces hollow blocks with compressive strengths of 15–25MPa, meeting ASTM C90 and BS EN 771 standards for load-bearing and non-load-bearing applications.

Q5: What are the power requirements?
Total power requirements range from 40.5KW to 54KW depending on model, with the ZS-QT8-15 requiring 46KW . All models operate on standard industrial three-phase power.

Q6: Does the machine require special foundation work?
A reinforced concrete foundation is recommended, with dimensions appropriate to machine weight (8.5 tons for the ZS-QT8-15) . Foundation drawings and specifications are provided with the machine.