QT4-15A Automatic Block Machine for Concrete – Full Range1

Matched Line Configuration — Vibration force, hydraulic pressure, and pallet handling are specified together as one system for the QT4-15A, preventing the press from standing idle while upstream or downstream stations catch up.

Technical Specifications

Application Suitability

What "Automatic" Really Means Across the Output Tiers

The QT4-15A bridges entry-level semi-automatic workshops and high-volume fully automatic lines, so buyers can place their daily target and site footprint on the range before committing capital.

Many quotations quote cycles per hour without naming the block format that figure assumes, so a buyer expecting one output level for hollow blocks receives something quite different when switching to pavers. When an automatic block machine manufacturer lists a molding cycle of 15–25 seconds, the spread itself signals that block height, mix stiffness, and vibration tuning all shift the real number. I have watched lines stall because the pallet feeder could not keep pace with a press running at its fastest setting, leaving operators hand-feeding pallets and losing the automation advantage entirely [NEED_CITE: pallet cycle matching in block line design].

Where the QT4-15A Sits on the Investment Ladder

This machine occupies the middle tier of our automatic block machine range. Below it, semi-automatic models require manual pallet handling and lower initial outlay but cap daily volume. Above it, high-capacity lines add automatic cubing, curing rack handling, and remote diagnostics, demanding larger curing yards and higher power supply capacity. The QT4-15A gives buyers a PLC-controlled automatic cycle with pallet feeding and block conveying integrated, without requiring the footprint of a full cubing line.

Plant Footprint and Line Sequencing for This Tier

The QT4-15A line stretches from the batching plant through the JQ500 pan mixer and the 8 m belt conveyor into the press itself, then onward to the stacker and trolley path toward the curing yard. Each station must be timed so the press never waits for a mix batch or an empty pallet. When a buyer’s existing curing area uses a particular forklift, the pallet size of 1020 x 570 mm must match that equipment — otherwise blocks are double-handled before they even leave the press [NEED_CITE: pallet and forklift compatibility in block curing yards].

Reading the Specs That Actually Shape Block Quality

The 16 MPa rated hydraulic pressure works together with platform vibration to compact the mix into the mould cavity. If vibration force is high but pressure is low, blocks emerge with porous cores and fail compressive strength tests; if pressure dominates without adequate vibration, the mix does not flow into mould corners and edges chip during demoulding. The PLC electronic console sequences pallet feed, vibration, pressure, and conveyor discharge as one cycle, removing the timing inconsistency that manual valve operation introduces. Mould change flexibility means a buyer can start with hollow blocks and add paving or interlocking formats later, but the changeover procedure and tooling must be planned before the first production run so that the format switch does not consume half a shift.

The Cost of Skipping the Line-Level View

Buyers who select a press in isolation often find that pallet handling, stacking, and curing were never included in the quotation, leaving finished blocks stacked by hand at the end of the conveyor. A mismatched pallet size forces the buyer to purchase a new forklift or resize the curing racks. Voltage, frequency, and PLC display language left unconfirmed before production can delay commissioning for weeks while control boards are swapped after arrival [NEED_CITE: commissioning delays from unconfirmed voltage and PLC language]. These issues do not show up in the press spec sheet but determine whether the line runs on day one.

Why Source the QT4-15A Through This Range

Block machinery is our single focus, so the QT4-15A press, its mould, pallet, and handling equipment are specified as one matched system rather than assembled from separate suppliers. Configuration is set against the buyer’s actual mix design and local aggregate, not a catalogue default. Mould design covers the formats the buyer’s market actually sells, with custom drawings available when standard formats do not match local demand. Automation level is selectable, allowing a buyer to start at the QT4-15A tier and add cubing or remote diagnostics later as volume grows. Installation support includes operator training on the PLC sequence and mould change procedure.

Documentation & Verification

• Line layout and capacity calculation stating the block format assumed for the QT4-15A tier
• Machine specification sheet with 16 MPa pressure, platform vibration, and 1020 x 570 mm pallet size
• Mould drawing and format list showing included hollow mould and custom options
• Voltage, frequency, and PLC display language confirmation sheet before production begins
• Factory test record on the buyer’s target block format before dispatch
• Packing photographs and customs documentation support for container loading

Installation, Commissioning & Support

• Foundation plan sized to the 7100 x 1600 mm footprint plus mixer and conveyor run
• Dedicated power circuit rated for the 27.5 kW overall power draw at confirmed voltage and frequency
• Machine dismantled for container loading and reassembled on-site with alignment checks
• First-run parameter tuning of vibration time and hydraulic pressure to the buyer’s mix
• Operator training on PLC console sequence, mould change, and daily greasing points
• Wear parts list covering hydraulic seals, vibration springs, and mould liner plates

What to Send With Your First Inquiry

Share your target block formats, the daily output you need for each, and a sample or description of your local aggregate so we can match vibration and pressure settings. Confirm your site’s voltage, frequency, and preferred PLC display language to avoid control board swaps after arrival. Let us know your curing yard dimensions and the forklift or trolley system already on site so pallet sizing fits your existing handling equipment.

Frequently Asked Questions

Q: Where does the QT4-15A sit in the full machine range, and how do I choose between it and a higher or lower tier?
A: The QT4-15A is the mid-tier automatic option, above semi-automatic workshop machines and below high-capacity cubing lines. Choice depends on daily output target per block format, curing yard space, and investment ceiling. We provide a capacity calculation per format so you can compare tiers on actual output rather than cycle counts alone.

Q: How is capacity calculated, and which block format is the quoted output based on?
A: Capacity depends on block height, mix stiffness, and the resulting molding cycle within the 15–25 second range. We state output per format — hollow, solid, or paver — because each has a different cycle. A line layout document accompanies every quotation showing the assumed format and realistic daily volume.

Q: What is the plant footprint for the QT4-15A line including mixer, conveyor, and curing area?
A: The press itself measures 7100 x 1600 mm, with the JQ500 mixer and 8 m belt conveyor adding length upstream and the stacker and trolley path extending downstream. Total line length plus curing yard area is laid out in the proposal so you can verify site fit before ordering.

Q: Can I start with the QT4-15A and upgrade automation level later?
A: Yes. The QT4-15A platform accepts additional automation modules such as automatic cubing and curing rack handling as your volume grows. The PLC architecture allows these additions without replacing the base machine, protecting your initial investment while scaling output.