The type
A stationary hydraulic vibropress. Pallet-based, usually PLC controlled.
No DramaChinaIndustrial sourcingContact
Block and brick machines
The model code tells you
the whole machine.
Chinese block machines are sold by code, not by name. Once you can read the code you can compare two quotes in ten seconds, and catch the brochures claiming more than the machine can physically do.
How to read it
QT4-15, decoded.
+
Blocks per mould cycle
Standard 400 × 200 × 200 mm hollow blocks, per press.
The forming cycle, in seconds
Not blocks per cycle, which is what a widely-read marketplace guide claims. Every manufacturer specification we checked contradicts it.
Semi-automatic variant
Same numbering. Vendors are inconsistent, so treat it as a hint and confirm it.
Mobile, egg-laying
No pallets. Lays directly onto a slab and drives forward.
Legacy codes, unknown
QT40-1 and QT40-2 do not follow the convention and we have not established what the 40 refers to. Ask before quoting one.
The arithmetic nobody publishes
Blocks per mould × 3,600
÷ cycle seconds.
That is a hard ceiling. It assumes the machine never stops for a pallet, a mix or a shift change, so a real line runs at roughly 70 to 85 per cent of it.
Several published claims sit above the ceiling entirely.
Every figure assumes the 400 × 200 × 200 mm block. Re-mould for a different unit size and every number changes.
Ceiling vs claimChecked 20.08.26
QT4-15 — 4 blocks, 15 s960 / hr
Vendor headline 1,000 / hrAbove its own ceiling
QT6-15 — 6 blocks, 15 s1,440 / hr
Vendor headline 1,375 / hrPlausible
QT10-15 — 10 blocks, 10-15 s2,400-3,600 / hr
What actually fails
Specific, checkable, and asked before you pay.
Panels with no protection
Motors wired straight to contactors with no overcurrent relays. Mixer panels with no ducting or earthing. That will not survive a workplace inspection, whatever the plate says.
No press-count mould warranty
A worn feed shoe seal puts 5-8 per cent variation in block height and gets whole batches rejected. We have not found a Chinese vendor who publishes a press-count warranty at all.
Pallet lock-in
Commonly 850 × 550 mm, machine-specific, not standardised. It decides your racks and curing chamber for the life of the plant.
Vibration and mass
Fixed-frequency bottom vibrators, no upper vibrators, no rubber isolation. Uneven vibration leaves air pockets and the blocks crumble in transport.
The cost never in the quote
Installation and commissioning at 5-10 per cent of machine cost, and foundation plus power adding around 30 per cent again.
Diagnosing the wrong thing
A PLC replaced twice for intermittent stops. The cause was a voltage dip from a compressor on the same circuit. A USD 15,000 problem fixed for under USD 500.
Model codeQT4-15
Four blocks per mould at a fifteen second cycle
Real ceiling960/hr
Before any pallet change, batching or stoppage
Same code, FOB China$20-40k
The spread is steel, hydraulics and protection
Sources are manufacturer troubleshooting guides and a competitor's published teardown, both interested parties. We could not find an independent buyer-complaint corpus for this equipment anywhere, which is itself worth knowing. Checked 20 August 2026.
Start with the machine
Send us the quotes you already have.
We decode them, run the output arithmetic, show where a 2x price spread on the same model code is actually coming from, and say plainly if a different machine suits you better.