Matched line balance — the QT4-18 press, JQ500 pan mixer, belt conveyor and pallet handling are specified as one system so no station waits on another.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | QT4-18 |
| Product Type | Automatic Concrete Block Making Machine |
| Overall Dimensions | 2500 × 1750 × 2200 mm |
| Rated Pressure | 16 MPa |
| Vibration Form | Platform Vibration |
| Pallet Size | 950 × 550 mm |
| Molding Cycle | 18–25 s (basis not stated in source — confirm block format / material / thickness) |
| Overall Power | 27.5 kW |
| Control System | PLC with frequency converter, Schneider electrical components |
| Automation Level | Semi-automatic (manual or machinery pallet transfer to curing yard) |
| Mould Change Mechanism | Double-sided synchronous gears for mould lifting |
| Material Feeder | Distribution belt hopper |
| Supporting Equipment | JQ500 pan mixer, 8 m / 6 m belt conveyor, stacker, block clamper, trolley, cement silo, batching plant |
Application Suitability
| Application | Material or Output |
|---|---|
| Hollow block production | Crushed stone, sand, cement, fly ash |
| Solid block production | Coarse aggregate and cement blends |
| Cement brick production | Fine sand and cement mixes |
| Small to medium block plants | Daily output scaled to semi-automatic pallet handling |
| On-site construction block production | Housing project volumes with manual stacking option |
Why the Mixer Matters More Than the Press in a Block Production Line
The press is only as fast as the station feeding it.
I once visited a site in South Asia where the QT4-18 block making machine sat idle for long stretches between cycles. The press itself was ready, but the mixer could not discharge fast enough and the belt conveyor was too short to bridge the gap. The buyer had focused entirely on press cycle time and treated everything upstream as an afterthought. That mismatch turned a theoretically continuous block production line into a start-stop operation where the operator spent most of the shift waiting. [NEED_CITE: common line bottleneck causes in small block plants]
How Each Station Connects Around the Press
A block production line built around the QT4-18 starts with the batching plant and cement silo, which feed measured material into the JQ500 pan mixer. Once mixed, the concrete travels along the 8 m belt conveyor to the distribution belt hopper on the press. The hopper fills the mould cavity while the platform vibration and 16 MPa hydraulic pressure compact the block. After demoulding, pallets carrying wet blocks move to the curing yard — manually or by trolley, depending on the automation level chosen. Every one of these stations must match the press cycle, or the entire line loses rhythm.
Where the Pallet Loop Becomes the Real Constraint
The 950 × 550 mm pallet size determines how many blocks cure per rack tier and how many tiers the forklift can reach. If the curing yard runs out of empty pallets because blocks have not cured fast enough, the press stops regardless of how much mixed concrete is available. This is where semi-automatic lines often stall: the upstream stations are ready, but the downstream pallet return loop has not kept pace. Planning the curing area footprint and pallet inventory is as important as selecting the press itself. [NEED_CITE: pallet circulation planning in semi-automatic block plants]
Reading the Specs That Actually Affect Your Line
The 16 MPa rated pressure and platform vibration work together — pressure compresses the mix while vibration settles fine particles into voids, producing a denser block. If your local aggregate is rounded river gravel rather than angular crushed stone, the same pressure and vibration settings will yield different block strength, so the mix design must be confirmed before finalising machine settings. The distribution belt hopper spreads material evenly across the mould cavity; uneven fill causes density variation between blocks on the same pallet. The PLC with frequency converter controls vibration intensity per cycle, which matters when you switch between hollow block and solid block formats with different compaction requirements. The double-sided synchronous gear mechanism for mould lifting shortens changeover, but the actual time still depends on whether the operator has the correct tools and a clear procedure to follow.
The Hidden Cost of Treating Supporting Equipment as Optional
When the quotation covers only the press and the buyer sources the mixer, conveyor and stacking locally, the interfaces rarely align. Belt conveyor discharge height may not match the hopper inlet. Pallet dimensions ordered from a local steel shop may not fit the press rails. The forklift already in the yard may have fork spacing too narrow for the loaded pallet. Each mismatch adds days of on-site rework before the block production line runs continuously. [NEED_CITE: interface mismatch risks in piecemeal block plant assembly]
What We Do Differently for Your Line
We treat the QT4-18 as one station in a block production line, not a standalone product. The JQ500 mixer capacity is checked against the press cycle rate to confirm it can sustain continuous operation. Pallet size is verified against your existing curing racks and forklift fork width before production starts. Voltage, frequency and PLC display language are confirmed in writing so commissioning is not delayed after arrival. Moulds are selected for the block formats your market actually buys, not a generic catalogue set. The line layout drawing shows every station position, conveyor run and curing yard area so you know the full footprint before the equipment ships. [NEED_CITE: importance of pre-shipment layout confirmation for block plants]
Documentation & Verification
- Line layout drawing showing station positions, conveyor runs and curing yard area for the QT4-18 setup
- Capacity calculation sheet stating which hollow or solid block format the cycle time assumes
- Pallet specification confirming material, thickness and compatibility with your curing racks
- Voltage, frequency and PLC display language confirmation before production starts
- Mould drawing and format list covering the block types your market sells
- Factory test record on your specified block format before dispatch
Installation, Commissioning & Support
- Foundation pad must accommodate the 2500 × 1750 mm press footprint plus conveyor run and mixer station
- Dedicated power circuit sized for the 27.5 kW total load with voltage and frequency matched to your site supply
- Machine arrives partially assembled; press frame, hopper and hydraulic unit are reconnected on site
- First production run includes cycle time adjustment and vibration tuning for your local aggregate mix
- Operator training covers mould change procedure using the synchronous gear mechanism and PLC navigation
- Wear parts list identifies hydraulic seals and mould liners with reorder references for ongoing supply
What to Share When You Enquire
Tell us the block formats your market sells — hollow, solid, paving — and the target daily output so we can size the mixer and pallet loop accordingly. Share your site voltage, frequency and the language your operators read on a screen. If you already have curing racks or a forklift, send the dimensions so we confirm pallet compatibility. For a complete block production line proposal, let us know whether you need manual stacking or want the stacker and clamper included.
Frequently Asked Questions
Q: What block format does the 18–25 s molding cycle assume, and what is the realistic daily output?
A: The cycle range depends on block size, wall thickness and material density. We provide a capacity calculation that names the exact block format used as the basis, so you see the realistic daily output for the product you will actually sell rather than a generic figure.
Q: Is the JQ500 mixer capacity matched to the QT4-18 cycle rate?
A: The JQ500 pan mixer is paired with this press because its batch volume and discharge time can sustain continuous press operation. If your mix design has a higher water content or longer blending time, we verify the match before finalising the block production line.
Q: Will the 950 × 550 mm pallets fit my existing curing racks and forklift?
A: We ask for your rack tier spacing and forklift fork width before confirming the pallet order. If your current equipment does not match, we adjust the pallet specification or advise on the minimum curing yard changes needed.
Q: What does the quotation cover — pallet feeding, stacking and curing handling?
A: The standard scope includes the press, mixer, conveyor, stacker, block clamper and trolley. Pallet transfer to the curing yard can be manual or machinery-assisted. We confirm the automation level so there are no unquoted gaps in the line.
Q: What voltage and PLC language will the machine be configured for?
A: Voltage, frequency and PLC display language are confirmed in writing before production begins. This avoids commissioning delays caused by mismatched electrical supply or an interface your operators cannot read.
