Description
Stocked for immediate loading — every QTJ4-25 is factory-tested with the buyer’s target block format and local aggregate mix before container dispatch, so you know the machine performs on your materials before it leaves Linyi.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | QTJ4-25 |
| Product Type | Semi-Automatic Concrete Block Making Machine |
| Overall Dimensions | 6400 × 1500 × 2700 mm |
| Molding Cycle | 25 s |
| Vibration Frequency | 2800 – 5100 r/min |
| Vibration Force | 60 KN |
| Rated Power | 17.9 kW |
| Mixer Model | JQ350 |
| Pallet Size | 850 × 550 × 20 mm |
| Net Weight | 2500 KG |
| Automation Level | Semi-automatic |
| Output Capacity (Hollow Block 390 × 190 × 190 mm) | 4 pcs/mould, 480 pcs/hr, 3800 pcs/8hr |
| Output Capacity (Hollow Block 400 × 150 × 200 mm) | 5 pcs/mould, 600 pcs/hr, 4800 pcs/8hr |
| Output Capacity (Solid Brick 240 × 115 × 53 mm) | 18 pcs/mould, 2100 pcs/hr, 17000 pcs/8hr |
| Raw Materials | Crushed stone, sand, cement, fly ash, dust |
| Applied Products | Hollow blocks (8-inch, 6-inch), solid bricks, pavers, kerbstones |
| Assembly State | Complete set with mixer and conveyor |
Application Suitability
| Application | Material or Output |
|---|---|
| On-site hollow block production for housing projects | Crushed stone, sand, and cement in 8-inch and 6-inch formats |
| First block plant for entrepreneurs | Solid bricks and hollow blocks with low initial investment |
| Paver and kerbstone production for landscaping | Interlocking pavers and kerbstones using locally sourced aggregate |
| Fly-ash brick production near thermal plants | Fly ash blended with sand and cement for lightweight solid bricks |
| Small-scale distributor stocking multiple formats | Quick mould change between hollow blocks and solid bricks |
Why "480 Pieces per Hour" Can Mislead a Buyer Working to a Deadline
The QTJ4-25 block making machine in stock is rated at 480 pieces per hour based on a 390 × 190 × 190 mm hollow block — switch to a different format and the number changes.
Capacity figures quoted without a block format assumption are the single biggest cause of commissioning disputes. I have watched a machine arrive on site, get bolted down, and then produce half its brochure number because the buyer was running 6-inch blocks while the supplier tested with 8-inch. The vibration force and hydraulic pressure were matched to one format, not the one the buyer’s market actually demanded [NEED_CITE: block format impact on hourly output].
When a contractor is working to a project deadline, the last thing needed is a capacity argument after the container has been unloaded. That is why every QTJ4-25 block making machine in stock leaves our Linyi workshop only after we confirm which block format the buyer will run and re-verify the vibration frequency and mix proportions against that format.
Container Loading Without the Production Wait
A stocked machine means the gap between purchase order and container departure is measured in days, not weeks. The QTJ4-25 block making machine in stock ships as a matched set — press, JQ350 mixer, belt conveyor, pallets, and trolley — dismantled and loaded into a 20GP container under a documented loading plan. Buyers working to a construction schedule or a government housing tender can align vessel departure with their site readiness rather than chasing a factory build slot. Packing photographs are shared before the container doors close, so the receiving team knows exactly how the machine is secured for ocean transit.
Dispatch Timing That Matches a Construction Schedule
Contractors producing blocks on their own site often have a concrete date — literally — when foundations are poured and walls must start rising. A delayed machine means idle labour and rented formwork sitting unused. By holding the QTJ4-25 in stock, we can quote an arrival estimate at the order stage [NEED_CITE: typical ocean freight transit times to major block-importing regions]. The buyer coordinates customs clearance at destination with a known bill of lading date, and the installation window lines up with the project’s critical path rather than the supplier’s production backlog.
Specs That Matter on the Ground
The 60 KN vibration force paired with a frequency range of 2800 – 5100 r/min is not just a plate number — it determines how densely the concrete mix is compacted into the mould. Higher frequency with lower force suits fine sand mixes for solid bricks, while lower frequency with sustained force drives aggregate into the corners of a hollow block mould. Getting this balance wrong means blocks that crumble at the edges or come out too light to meet local building codes.
Pallet size at 850 × 550 × 20 mm sets the mould footprint and therefore the block layout per cycle. This dimension also dictates what forklift tines and curing rack slots the buyer needs. If the curing yard was built for 900 × 600 mm pallets from a previous supplier, the mismatch is discovered only after the machine arrives — and pallet re-ordering takes weeks.
The 25-second moulding cycle governs how fast each pallet moves through the press. Across an 8-hour shift with material loading and pallet handling factored in, the cycle time translates into the daily output figures listed in the specification table — provided the block format matches the one assumed.
What Happens When Dispatch Details Are Skipped
Skipping voltage and frequency confirmation before dispatch is the most common reason a stocked machine sits idle on arrival. I once saw a QTJ4-25 shipped to a 60 Hz market with a 50 Hz motor wired in — the vibration frequency dropped and blocks came out under-compacted until a replacement motor was flown in [NEED_CITE: voltage and frequency mismatches in exported machinery]. The same goes for PLC display language: an operator who cannot read the control screen makes parameter adjustments by guesswork, and guesswork breaks blocks.
Why Buyers Source This Model from Linyi
Block machinery is our single focus, which means the press, mould, pallet, and handling equipment are specified as one system rather than assembled from unrelated suppliers. Every QTJ4-25 is tested with the buyer’s stated mix design before dispatch — not a generic river sand recipe, but the actual aggregate the buyer will use at the destination. Pallet quantity and material are matched to the curing area and forklift the buyer already operates, so there is no post-arrival scramble for compatible accessories. We confirm voltage, frequency, and control language at the order stage, eliminating the commissioning delays that stranded machines from other workshops experience. Factory test records and loading photographs are standard, not extra-charge documentation.
Documentation & Verification
- Factory test record run on the buyer’s stated block format and mix design
- Voltage, frequency, and control language confirmation sheet signed before dispatch
- Container loading plan with pallet count and securing photographs
- Operation and maintenance manual covering JQ350 mixer and press together
- Wear parts and mould catalogue with re-order codes
- CE declaration provided where destination market requires it
Installation, Commissioning & Support
- 6400 × 1500 mm footprint requires a level concrete pad with anchor bolt provisions
- 17.9 kW rated power demands a dedicated circuit breaker sized to local code
- Machine ships dismantled; reassembly on site follows the labelled bolt-torque sequence
- First-run parameter setting covers vibration frequency and cycle timing per block format
- Operator training includes mould change procedure and pallet handling with the trolley
- Wear parts list covers vibration springs, mould liners, and JQ350 mixer blades
Before You Send an Inquiry
To match the right QTJ4-25 configuration to your project, share the block format your market sells, the aggregate and sand available locally, and the daily volume you need to hit. Let us know your site voltage and frequency, plus the display language your operators read. If you already have curing racks and forklifts on site, send the pallet dimensions so we can confirm compatibility before the container closes.
Frequently Asked Questions
Q: Is the QTJ4-25 currently in stock and what is the dispatch lead time?
A: Yes, the QTJ4-25 is held in stock at our Linyi facility. Once voltage, frequency, control language, and pallet quantity are confirmed, the machine is dismantled, packed, and loaded within days. The exact lead time depends on the container booking schedule at Qingdao port, but we provide a dispatch date and arrival estimate at the quotation stage.
Q: How is the machine packed and loaded into a 20GP container?
A: The press, JQ350 mixer, belt conveyor, pallets, and trolley are dismantled into container-sized sections and secured with steel bracing inside a 20GP container. Pallets are stacked in remaining floor space. Packing photographs and a loading plan are shared with the buyer before the container is sealed.
Q: What voltage and frequency options are available for immediate shipment?
A: Stock units can be re-wired before dispatch to match the destination market’s standard industrial supply. Voltage and frequency are confirmed at the order stage and verified during the factory test. PLC display language is also set before loading to avoid on-site commissioning delays.
Q: How many pallets are included and can more be loaded in the same container?
A: The standard package includes a set of production pallets sized at 850 × 550 × 20 mm. Additional pallets can be loaded in remaining container space. The exact quantity depends on how much room the dismantled press and mixer occupy, and we confirm the count in the loading plan.
Q: What is the arrival estimate once shipped, and is customs documentation provided?
A: Arrival timing depends on the vessel route from Qingdao to the destination port. We quote an estimated arrival date at the order stage and provide a commercial invoice, packing list, bill of lading, and certificate of origin. CE documentation is included where the destination market requires it for clearance.
