QT4-15 Cement Brick Machine | Technical Guide

Description

Matched to Format — QT4-15 configured around the buyer’s actual block type, local aggregate and target daily output, not a catalogue default.

Technical Specifications

Application Suitability

What "25–30 Seconds per Cycle" Leaves Out for the QT4-15 Brick Machine

Cycle time is meaningless unless tied to a specific block format, mix design and thickness.

I once shipped a QT4-15 block machine to a Middle East contractor who ran river sand straight from the wadi. The vibration frequency and hydraulic pressure we had dialed in at the factory used standard crushed granite. Their sand was round-grained and far less responsive to platform vibration. The blocks came out crumbly, an entire trial batch was scrapped, and we spent a week re-tuning the pressure and frequency remotely before they could sell a single pallet. A quoted molding cycle of 25–30 seconds only holds when the aggregate, moisture content and cement ratio match what was tested [NEED_CITE: effect of aggregate shape on vibration compaction in concrete block production]. Without that match, real output and block strength both drift well below expectation.

Mould Selection Determines Real Capacity

The QT4-15 brick machine supports hollow, solid, paver, interlocking and curbstone moulds on the same 880×550 mm pallet. A hollow block mould with large voids requires a longer vibration window than a thin paver mould, so the cycle figure shifts depending on what sits on the table. Buyers who plan production around a single catalogue number often find their daily tally falls short once they switch formats mid-shift. We list cycle time and projected output per format so the buyer can plan around what their market actually orders.

Matching Vibration and Pressure to Local Aggregate

Platform vibration at 4200 r/min delivers 55 kN of compaction force, while the hydraulic system holds 16–21 MPa of forming pressure. These two numbers must work together against the buyer’s specific aggregate gradation and cement content [NEED_CITE: relationship between vibration force and hydraulic pressure in block density]. If the local stone is soft limestone rather than hard basalt, excess pressure crushes the aggregate before vibration consolidates the mix. We ask every buyer for a sample of their raw material, run it on the press, and adjust the pressure band and vibration duration before the machine leaves the floor.

Reading the Specs That Matter on Site

The 4100×1600×2600 mm footprint means the QT4-15 brick machine fits inside a 300 m² plant envelope when paired with a basic mixer and pallet return conveyor. Total mass of 4 T keeps the machine stable under full vibration without requiring a deep concrete pit, though a level reinforced slab is still mandatory. The 18.45 kW overall power draw calls for a dedicated three-phase circuit; undersizing the breaker is the most common commissioning delay we see on arrival. Pallet size 880×550 mm must be checked against the buyer’s existing curing racks and forklift tine spacing before the order is locked in, because re-cutting racks after delivery adds weeks of downtime.

The Hidden Cost of Skipping Format Confirmation

Buyers who skip sending a raw material sample and a target block drawing often discover three problems after arrival. First, the mould produces a block dimension that does not match the local market standard, forcing a costly replacement mould and weeks of shipping delay. Second, the vibration force is either too aggressive or too mild for the aggregate on hand, leading to surface spalling or low compressive strength. Third, the pallet size does not slot into the curing racks already welded on site, leaving wet blocks stacked by hand in the sun [NEED_CITE: impact of improper curing on concrete block compressive strength]. Every one of these issues traces back to a missing conversation before production.

Why Buyers Spec the QT4-15 Here

Block machinery is the single focus of this workshop, so the press, mould, pallet and handling equipment are specified as one matched line rather than assembled from unrelated suppliers. Configuration is set against the buyer’s actual mix design and target block format, not a default catalogue page. Mould design covers every format the buyer’s market sells, including custom drawings when local standards call for non-standard dimensions. Automation level is selectable, meaning a buyer can start with semi-automatic pallet handling and add automatic stacking later without replacing the press. Factory testing uses the buyer’s own raw material sample so the first pallet produced on site already meets strength requirements.

Documentation & Verification

• Line layout showing QT4-15 footprint and pallet flow path within 300 m² plant area
• Capacity table listing cycle time and daily output for each confirmed block format
• Mould drawing pack with dimensional tolerances for every block type on order
• Hydraulic and electrical schematics matching installed valve and sensor part numbers
• Factory test record using buyer’s raw material with block density and strength values
• Voltage, frequency and PLC display language written confirmation before dispatch

Installation, Commissioning & Support

• Reinforced concrete slab required under the 4 T QT4-15 to absorb platform vibration load
• Dedicated three-phase circuit rated for 18.45 kW with correct voltage and frequency for destination country
• Machine shipped in dismantled state with numbered components for reassembly on site
• First-run parameter tuning of vibration frequency and hydraulic pressure using local aggregate sample
• Operator training on mould change procedure and PLC fault code reading in confirmed language
• Wear parts list covering hydraulic seals, vibration springs and mould liner plates

What We Need to Quote the Right Configuration

Send a sample of the crushed stone, sand or fly ash you plan to run, along with the block format drawing or photograph that your local market expects. Tell us your target daily output, the curing area you have available, and the forklift tine spacing so we can confirm the 880×550 mm pallet will fit. Include your site voltage, frequency and preferred PLC display language so the electrical cabinet is built correctly before shipping.

Frequently Asked Questions

Q: What block format is the 25–30 s cycle time based on, and what is the realistic daily output for my target block?
A: The 25–30 second range was recorded under factory conditions and must be verified against your specific block thickness, mix design and aggregate. We run your material sample on the press, measure the actual cycle for each format, and provide a capacity table tied to those results rather than a single blanket figure.

Q: How are vibration force and hydraulic pressure matched to my local aggregate?
A: We ask for a raw material sample, then adjust the 55 kN vibration force and 16–21 MPa pressure band on the QT4-15 until the test block reaches the required density and surface finish. The final settings are recorded in the factory test report and loaded into the PLC before shipment.

Q: What mould formats are available, and can custom moulds be made to my drawings?
A: Standard moulds cover hollow, solid, paver, interlocking and curbstone formats on the 880×550 mm pallet. If your market requires a non-standard dimension or special texture, we produce a custom mould to your drawing and run a sample block for approval before bulk production.

Q: Is the 880×550 mm pallet compatible with my existing curing racks and forklift?
A: We check your rack slot width and forklift tine spacing against the pallet dimensions before the order is finalized. If your existing racks were built for a different size, we recommend either adjusting the rack spacing or selecting an alternative pallet size so blocks move from press to curing area without manual re-stacking.

Q: What is the mould change time, and does it allow practical format switching within a single shift?
A: Mould change involves unclamping the current mould, lifting it with the plant hoist, lowering the new mould and re-aligning the hydraulic ejector pins. On the QT4-15 this typically takes one operator a short period, leaving the rest of the shift available for production. We confirm the exact procedure and time during operator training.