Line Rhythm Match — every station from the JQ350 mixer to the automatic stacker is timed against the QT4-18 press cycle so the host never waits for material or pallets.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | QT4-18 |
| Product Type | Concrete Block Making Machine |
| Overall Dimensions (L×W×H) | 3900×1600×2300 mm |
| Total Weight | 3 T |
| Rated Power | 24 kW (basis to be confirmed) |
| Molding Cycle | 15-25 s |
| Vibration Force | 40-50 kN |
| Mixer Model | JQ350 |
| Pallet Size | 850×550×25 mm |
| Automation Level | Semi-automatic |
| Output Capacity (Hollow Block 400×200×200 mm) | 1200-1680 pcs/hr (basis: 15-20 s cycle) |
| Output Capacity (Hollow Block 400×150×200 mm) | 1800-2400 pcs/hr (basis: 15-20 s cycle) |
| Output Capacity (Solid Brick 240×115×53 mm) | 3240 pcs/hr (basis: 15-20 s cycle) |
| Mould Format Options | Hollow block, solid brick, paver, curbstone |
| Stacking Method | Automatic stacker included |
| Applied Products | Paver, solid block, hollow block, curbstone |
| Raw Materials | Crushed stones, sand, cement, dust, fly ash |
Application Suitability
| Application | Material or Output |
|---|---|
| Hollow Block Production | Crushed stones, sand, cement, fly ash (400×200×200 mm / 400×150×200 mm) |
| Solid Brick Production | Cement, sand, dust, aggregate (240×115×53 mm) |
| Paver & Curbstone Production | High-density concrete mix with fine aggregates |
| On-Site Construction Supply | Local aggregate and cement for project-specific block formats |
What "1200 Pieces per Hour" Leaves Out About Your Block Production Line Equipment
A press rating means nothing if the mixer cannot feed it or the stacker cannot keep up.
When I plan a block production line equipment layout, the first thing I check is not the host press capacity but the gap between stations. I once saw a fully automatic hollow block line in the Middle East where the press was rated for high output, yet the mixer discharged too slowly and the pallet return loop added seconds per cycle. The press spent nearly half its shift idling. Real throughput dropped to roughly six tenths of the quoted figure, and the buyer blamed the machine instead of the line balance [NEED_CITE: cycle time synchronization across block line stations].
How the Stations Connect Around the QT4-18 Press
A complete concrete block making line with supporting equipment starts at the JQ350 mixer, which must discharge a full batch within the press molding window of 15 to 25 seconds. The material conveyor then delivers the mix to the host hopper before the next cycle begins. If the conveyor belt speed or angle is mismatched, the press waits and daily output drops regardless of how fast the vibration table can compact.
The pallet system closes the loop. Pallets measuring 850×550×25 mm travel from the press to the automatic stacker, then onto a transfer trolley that carries them to the curing area. Every station in this block production line equipment setup must complete its task within the same cycle envelope, or the slowest link dictates the real daily tonnage.
Where the Pallet Return Path Creates Hidden Delays
Buyers often focus on the press and overlook the return path. Once the stacker lifts the loaded pallet, an empty pallet must slide back under the mold before the next vibration cycle. If the pallet magazine is undersized or the return conveyor runs at a different speed, the press holds for seconds that add up over an eight-hour shift [NEED_CITE: pallet handling bottleneck in semi-automatic block plants].
The 850×550×25 mm pallet dimension also has to match the curing rack spacing and the forklift tine width already in the buyer’s yard. A mismatch here means pallets are restacked by hand after the line delivers them, which cancels the benefit of the automatic stacker entirely.
Reading the Numbers That Actually Matter
The vibration force of 40 to 50 kN works together with hydraulic pressure to compact the concrete mix into a dense block. Higher vibration alone does not guarantee strength if the hydraulic pressure is too low to squeeze out trapped air. For hollow blocks at 400×200×200 mm, the 15 to 20 second cycle produces 1200 to 1680 pieces per hour, but switching to a 400×150×200 mm format raises the count to 1800 to 2400 pieces per hour because each mold holds more cavities.
The rated power of 24 kW must cover the vibration motor, hydraulic pump, conveyor drive, and stacker simultaneously. If the buyer’s site voltage fluctuates or the frequency does not match, the motors run outside their design point and the cycle time drifts. Confirming voltage, frequency, and PLC display language before production avoids commissioning delays that can stretch into weeks [NEED_CITE: electrical specification mismatches in exported machinery].
The Cost of Ignoring Line Balance
When the mixer output, press cycle, and stacker speed are not calculated together, the consequences show up on the first production day. The press starves for material, operators manually shuttle pallets, and the curing area becomes a bottleneck because pallets arrive faster than workers can sort them. I have watched crews add a second shift just to meet the output that a single shift should have delivered, and the extra labor cost quietly erased any savings from buying a cheaper press [NEED_CITE: hidden labor cost from unbalanced block line stations].
Why Sourcing the Whole Line from One Supplier Matters
Block machinery is our single focus, so the QT4-18 press, JQ350 mixer, pallets, and stacker are specified as one matched system rather than assembled from separate vendors. Configuration is set against your actual mix design and local aggregate, not a catalog default. Mould design covers the formats your market sells, including custom drawings when standard options do not fit. Automation level is selectable, letting you start semi-automatic and upgrade later without replacing the press. Installation support includes operator training so your crew understands the cycle-time relationship between every station.
Documentation & Verification
- Line layout showing capacity calculation per block format for the QT4-18
- Pallet specification sheet matched to your curing rack and forklift dimensions
- Hydraulic and electrical schematic with voltage and frequency noted
- Factory test record running your chosen mould format before dispatch
- Operation and maintenance manual covering mixer, press, and stacker
Installation, Commissioning & Support
- Foundation plan based on the 3900×1600×2300 mm footprint and 3 T operating weight
- Power supply check for 24 kW total draw across mixer, press, and stacker circuits
- Assembly guidance for line stations delivered in dismantled state for container loading
- First-run parameter setting for 15 to 25 second molding cycle on your target format
- Operator training on mould change procedure and pallet return path maintenance
- Wear parts list covering vibration table springs, hydraulic seals, and mixer blades
What We Need to Quote Your Line Accurately
Send us the block format you sell most, your target daily output, and the raw materials available locally. Tell us the curing area dimensions and the forklift capacity you already have on site. Confirm your site voltage, frequency, and preferred PLC display language so the concrete block making line with supporting equipment arrives ready to commission.
Frequently Asked Questions
Q: Which stations are included in the line and which are optional?
A: The standard line includes the JQ350 mixer, material conveyor, QT4-18 host press, automatic stacker, pallets, and transfer trolley. If you already have a mixer or curing rack system, we can omit those stations and adjust the quotation. Every remaining station is still cycle-time matched to the press.
Q: How is daily output calculated and which format does it assume?
A: Output figures are tied to a specific block size and molding cycle. For the 400×200×200 mm hollow block at a 15 to 20 second cycle, the press produces 1200 to 1680 pieces per hour. Switching to a smaller format or a different cycle time changes the number, so we state the assumption on every capacity sheet.
Q: Is the pallet size matched to my existing curing racks and forklift?
A: We specify 850×550×25 mm pallets as standard, but we confirm this against your curing rack spacing and forklift tine width before production. A mismatch forces manual restacking and cancels the automatic stacker benefit, so we adjust pallet dimensions if your site requires it.
Q: How do the mixer and stacker synchronize with the press cycle?
A: The JQ350 mixer discharges a full batch within the 15 to 25 second press window, and the stacker lifts and returns pallets inside the same envelope. We document each station’s cycle time in the line layout so you can verify that no single link slows the entire block production line equipment.
