Single-supplier line integration — every station from raw material feeding through to stacking is specified against the QTJ4-24 cycle time so no upstream or downstream unit leaves the press waiting.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | QTJ4-24 |
| Product Type | Semi-Automatic Concrete Block Making Machine |
| Overall Dimensions | 2060 × 1730 × 2580 mm |
| Main Vibration Form | Platform vibration |
| Vibration Frequency | 4200 r/min |
| Exciting Force | 35.5 kN |
| Rated Pressure | 15 MPa |
| Pallet Size | 880 × 480 × 38 mm |
| Molding Cycle | 26 s |
| Total Power | 14.25 kW |
| Control System | Electro-mechanical integration with frequency converting control |
| Automation Level | Semi-automatic |
| Voltage | 380 V, 3-phase, 50 Hz (configurable to local supply) |
| Warranty | 1 year (excluding wearing parts) |
| Assembly State | Assembled main unit, supports full line integration |
Application Suitability
| Application | Material or Output |
|---|---|
| Small-scale block plant start-up | Hollow and solid blocks from crushed stone, sand and cement |
| On-site housing project production | Interlocking pavers and wall blocks using local aggregate |
| Entrepreneur block business | Multiple formats via exchangeable moulds on a shared pallet size |
| Contractor yard production | Semi-automatic line with manual pallet return for lower initial investment |
What a "Complete Line" Quotation Actually Covers
A semi-automatic block machine production line is only complete when the mixer, pallet feeder, press and stacker are each timed to the same cycle, not just listed on one invoice.
I once watched a Middle East project lose a large portion of its rated hourly output because the pan mixer discharged slower than the QTJ4-24 press could accept material. The press sat idle between cycles while the operator waited for the next batch. That kind of mismatch never shows up on a spec sheet, but it shows up in the daily count every single shift [NEED_CITE: common causes of output shortfall in small block plants]. When we quote a semi-automatic block machine production line around this press, we calculate the mixer batch time, the belt feeder discharge rate and the pallet return speed against the 26-second molding cycle so the stations keep pace.
Matching Every Station to the 26-Second Press Rhythm
The QTJ4-24 completes one molding cycle every 26 seconds. That figure sets the heartbeat for the entire semi-automatic block machine production line. The mixer must release a fresh batch into the feeder hopper within that window, the pallet feeder must slide a clean board under the mould before the press head descends, and the operator or stacker must clear the finished block before the next pallet arrives. If any station drifts, the press waits and the hourly count drops.
Pallet Size Decides More Than the Press Alone
An 880 × 480 × 38 mm pallet is not just a press parameter — it governs the pallet feeder magazine width, the curing rack slot spacing and the forklift tine length in the yard. Buyers who confirm pallet size only against the press sometimes discover that their existing curing racks are built for a different board dimension, forcing a full rack replacement before the first block is cured [NEED_CITE: pallet and curing rack compatibility in block production]. We lock the pallet specification across every station drawing before production begins.
How Pressure, Vibration and Frequency Shape Block Density
Platform vibration at 4200 r/min combined with 35.5 kN exciting force and 15 MPa rated pressure determines how tightly the aggregate particles pack inside the mould cavity. Higher vibration frequency fluidises the mix, while hydraulic pressure compacts it from above. The frequency converting control on the QTJ4-24 lets the operator adjust vibration intensity to suit different mix designs — a drier mix with coarse crushed stone needs more energy than a wetter sand-rich mix. Getting this balance right at commissioning prevents weak blocks that crack during curing or fail compressive strength tests on site.
The Cost of Ignoring Line Timing
When upstream and downstream stations are sourced separately, the supplier of each unit has no incentive to match cycle times. The mixer vendor quotes a machine that meets a batch volume target, the stacker vendor quotes a unit that meets a lift speed target, and nobody checks whether both fit inside the press cycle. The result is a line that technically runs but never reaches its expected output, and disputes between vendors about whose equipment is the bottleneck [NEED_CITE: multi-vendor line integration disputes in concrete product plants]. Specifying the entire semi-automatic block machine production line from one supplier removes that gap.
Why Source the Full Line Here
We treat the QTJ4-24 as the anchor of a matched system, not a standalone catalogue item. Every supporting station — feeder, mixer, pallet return, stacking rack — is selected and timed against the 26-second cycle before the quotation is issued. Mould design covers the exact block formats the buyer’s market demands, including custom drawings when local standards require non-standard dimensions. Automation level is selectable, so a buyer can start with manual pallet handling and add automatic stacking later without replacing the press. Installation support includes operator training on the frequency converting control so the crew can adjust vibration profiles for different mix designs from day one.
Documentation & Verification
- Line layout drawing showing every station with cycle time per block format
- Pallet specification sheet matched to curing rack and forklift dimensions
- Voltage, frequency and control language confirmation before production
- Factory test record on the buyer’s selected mould and mix design
- Operation and maintenance manual covering press and all supporting stations
- Wear parts and mould list with replacement intervals
Installation, Commissioning & Support
- Foundation plan sized to the 2060 × 1730 mm press footprint and vibration load
- Dedicated electrical circuit rated for 14.25 kW total line draw at confirmed voltage
- Assembled main unit shipped with supporting stations pallet-matched for container loading
- On-site commissioning with vibration frequency tuning to the buyer’s aggregate and mix
- Operator training on mould change procedure and frequency converting control adjustment
- Wear parts inventory recommendation based on local aggregate abrasiveness
What We Need to Configure Your Line
To prepare a line layout around the QTJ4-24, share your target block format and daily output goal, the raw materials available locally and their grading, your site dimensions and curing yard area, and the local voltage and frequency. If you already own a forklift or curing racks, send their specifications so the pallet size can be matched from the start.
Frequently Asked Questions
Q: What stations are included in the complete line around the QTJ4-24?
A: A typical semi-automatic block machine production line built around this press includes a pan mixer, belt or screw feeder, pallet feeder magazine, the press itself, a pallet return conveyor and a stacking rack. Each station is specified and timed to the 26-second molding cycle so the press is never left idle between cycles.
Q: How do cycle times of the mixer, feeder and stacker match the press?
A: We calculate the mixer batch discharge time, feeder travel speed and pallet return speed against the 26-second molding cycle. If the mixer batch takes longer than the press cycle, we specify a larger mixer or a holding hopper so the press receives material without waiting.
Q: Is pallet handling and stacking included, or only the press?
A: Pallet handling and stacking are included in the line quotation. The 880 × 480 × 38 mm pallet size is carried through to the pallet feeder magazine, curing rack slots and stacking rack so every station uses the same board dimension.
Q: What footprint does the full line require?
A: The press itself occupies roughly 2060 × 1730 mm, but the full line including mixer, feeder, pallet return and curing rack needs a larger yard. We provide a scaled layout drawing showing station placement and curing area based on the buyer’s daily output target and available space.
Q: Can the line start semi-automatic and add automatic stacking later?
A: Yes. The QTJ4-24 supports line integration and can begin with manual pallet handling. When production volume justifies it, an automatic stacker and pallet return system can be added without replacing the press or changing the mould set.
