Description
System-Matched Integration — The QT4-25 is specified as one matched system where PLC control logic, pallet feed timing, and stacking cycles are calibrated together rather than assembled from separate automation suppliers.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | QT4-25 (QTJ4-25) |
| Product Type | Automatic Concrete Block Making Machine |
| Control System | PLC controlled, fully automatic |
| Machine Power | 16.58 kW |
| Molding Cycle | 25 seconds |
| Capacity | 4600 pcs / 8 hours (basis not stated in source — confirm block format, material, and thickness) |
| Machine Weight | 5000 kg |
| Overall Size | 6400 × 1500 × 2700 mm |
| Pallet Size | 850 × 480 mm |
| Voltage | Configurable according to local supply (frequency to be confirmed) |
| Vibration System | Vibration motor with large vibration box (hydraulic pressure not included) |
| Automation Level | Fully automatic (pallet feeding, material feeding, scraping, block stacking) |
| Motor Brand | Siemens motor |
| Frame Construction | Thick steel frame |
| Warranty | One year |
| Block Formats | Hollow blocks, solid blocks/bricks, paver stone bricks |
| Standards | CE declaration where applicable |
Application Suitability
| Application | Material or Output |
|---|---|
| Medium-scale hollow block production | Crushed stone, cement, sand, water |
| Solid brick manufacturing | Fly ash, cement, lime, sand |
| Paver stone production for walkways and yards | Concrete mix with fine aggregate |
| Upgrading from manual pallet handling | Existing semi-automatic plants adding format flexibility |
| First block plant for regional construction supply | Concrete with locally sourced aggregate |
What "4600 Pieces per Shift" Actually Means on Your Shop Floor
The number only holds when the block format, mix design, and pallet cycle all match the assumption behind the rating.
I have watched plant owners sign off on a capacity figure and then wonder why the forklift driver is standing idle while the operator waits for the next pallet. The automatic concrete block making machine PLC controlled cycle is only as fast as the slowest station around it. If the curing rack layout forces a longer travel path than the stacking station expects, the press sits through dead seconds that were never in the brochure [NEED_CITE: cycle time assumptions in block machine capacity calculations]. Voltage confirmation, PLC display language, and pallet size need to be locked before the machine leaves the factory floor, not discovered during commissioning.
PLC Logic That Matches the Physical Line Timing
The automatic concrete block making machine PLC controlled sequence on the QT4-25 coordinates pallet feed, material dosing, vibration, scraping, and block stacking in a single loop. The PLC does not just replace manual buttons — it enforces the 25-second molding cycle by preventing the next pallet from entering until the current one clears the stacking station. When the control logic is written against the actual pallet size of 850 × 480 mm and the physical travel distances inside the line, the operator stops overriding timers and the batch-to-batch consistency improves noticeably.
Where Full Automation Removes Operator Dependency
In a semi-automatic setup, the operator decides when to feed material and when to pull the pallet. Every hesitation and every shortcut becomes a variable in block density. The QT4-25 removes those variables from the human operator and hands them to the PLC and Siemens motors running the vibration box. The thick steel frame absorbs the repeated vibration force across the full shift without the frame flex that causes dimensional drift over time [NEED_CITE: frame rigidity and block dimensional tolerance in vibration block machines]. What remains for the operator is supervision, format changes, and raw material staging — tasks that require judgment rather than rhythm.
Specs That Translate Directly to Daily Output Decisions
The 16.58 kW machine power rating covers the vibration motor, material feed drive, and pallet handling motors together. On sites where the incoming supply sags under shared transformer load, that power draw needs a dedicated circuit with correct breaker sizing — otherwise the PLC will fault mid-cycle and the half-formed block on the pallet becomes scrap. The 25-second molding cycle is achievable when the mix design flows cleanly through the material feed hopper; sticky mixes with high clay content will slow the dosing phase and extend the actual cycle beyond the rated value. The 850 × 480 mm pallet size determines how many blocks fit per layer and how the curing racks must be spaced — a mismatch here means rebuilding the curing area or running a non-standard pallet that the automatic stacker cannot grip reliably. The vibration motor paired with the large vibration box delivers compaction through mechanical vibration alone; hydraulic pressure is not part of this configuration, which means block strength depends more heavily on mix proportioning and vibration duration than on pressing force.
The Hidden Cost of Skipping the Voltage and Language Confirmation
A machine wired for 380 V / 50 Hz arriving at a site running 415 V / 60 Hz does not just run hot — the Siemens motors burn out and the PLC transformer fails, leaving the entire line dead until replacement components ship from overseas. I have seen three-week delays on a Nigerian site because the voltage question was left to assumption [NEED_CITE: voltage and frequency standards by export market]. The PLC display language is the smaller but equally frustrating problem: an operator reading fault codes in a language they do not understand will pull the emergency stop and call for help rather than clear a simple sensor fault, turning a two-minute fix into a half-day standstill.
Why Buyers Configure the Line Here
The QT4-25 is specified as one matched system — the PLC program, pallet size, stacking logic, and vibration timing are written against each other before the machine ships, not tuned on site after separate components arrive from different suppliers. Configuration is set against the buyer’s actual mix design and target block format rather than a catalogue default. Mould design covers the formats the buyer’s market sells, and custom drawings are accepted. Automation level is selectable so a plant can start with the fully automatic QT4-25 and add further line extensions without replacing the press. Installation and commissioning support includes operator training so the crew knows what the PLC expects from them.
Documentation & Verification
- Line layout with capacity calculation stating the block format assumed for the 4600 pcs / 8 hours figure
- Machine specification sheet with pallet size 850 × 480 mm matched to curing area dimensions
- Hydraulic and electrical schematic confirming Siemens motor ratings and PLC I/O map
- Voltage, frequency, and PLC display language confirmation document before dispatch
- Factory test record run on the buyer’s target block format
- Operation and maintenance manual with wear parts and mould list
Installation, Commissioning & Support
- 6400 × 1500 × 2700 mm footprint requires a level concrete pad with anchor bolt provisions
- 16.58 kW total load needs a dedicated circuit with correct breaker sizing for local voltage
- Machine ships dismantled to fit standard container; reassembly and alignment on site
- PLC commissioning includes cycle timing verification against the buyer’s pallet size and stacking layout
- Operator training covers mould change procedure, fault code reading, and daily lubrication points
- One-year warranty with wear parts and mould supply available during and after the warranty period
Before You Request a Quote
To size this line correctly, provide the target block format and dimensions you intend to produce, your local voltage and frequency supply, and the PLC display language your operators need. If you already have curing racks and forklifts on site, share the pallet dimensions they accept so the 850 × 480 mm pallet can be confirmed or adjusted. State the daily output you are targeting against a specific block type so the capacity calculation can be run against that format rather than a generic assumption.
Frequently Asked Questions
Q: How do I verify the 4600 pcs / 8 hours capacity for my specific block format?
A: The stated capacity depends on block dimensions, wall thickness, and mix design — a solid brick cycles differently from a hollow block. Request a line layout and capacity calculation that names the exact block format assumed. This lets you compare the quoted number against your actual daily production target and decide if the QT4-25 is the right tier or if a higher-output press is needed.
Q: What voltage and frequency options are available, and how is the PLC language set?
A: The QT4-25 is configurable for local voltage and frequency, and the PLC display language is set before shipment. Confirming these details during the order stage prevents motor damage and ensures operators can read fault codes and cycle parameters in their working language, avoiding commissioning delays on site.
Q: What tasks does the full automation cover, and what still needs an operator?
A: Pallet feeding, material feeding, scraping, and block stacking are handled automatically by the PLC-controlled sequence. The operator supervises the line, stages raw materials, performs mould changes, and responds to PLC alerts. This reduces headcount at the press but still requires one attentive operator per shift.
Q: Can I switch between hollow blocks, solid bricks, and pavers on the same machine?
A: The QT4-25 accepts different moulds for hollow blocks, solid bricks, and paver stone bricks. Mould change time depends on the changeover system and operator familiarity. Confirm the formats you plan to run regularly so the right mould set and changeover tools are included in the initial supply.
Q: Will the 850 × 480 mm pallet work with my existing curing racks and forklift?
A: Pallet size must match both the machine’s automatic stacker and the curing rack spacing you already have. Share your current rack dimensions and forklift fork width so the pallet specification can be confirmed or adjusted before production, preventing handling bottlenecks after the line is installed.
