System-Matched Line Configuration — every component from the JQ350 mixer through pallet handling is sized against the press cycle so no station starves or bottlenecks the QTJ4-25 during continuous production.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | QTJ4-25 |
| Product Type | Semi-Automatic Concrete Block Making Machine |
| Rated Power | 17.9 kW |
| Overall Dimensions (L×W×H) | 6400 × 1500 × 2700 mm |
| Net Weight | 2500 kg |
| Moulding Cycle | 25 s |
| Pallet Size | 850 × 550 × 20 mm |
| Vibration Frequency | 2800 r/min |
| Exciting Force | 60 kN |
| Output Capacity | 960 pcs/h, 7680 pcs/day (basis: 400×200×200 mm hollow block, 4 pcs/mould) |
| Automation Level | Semi-automatic |
| Control System | Motor-based (PLC not confirmed in source) |
| Hydraulic Station | Equipped |
| Vibration Type | Bed mould vertical vibration + upper mould compression vibration |
| Standard Configuration | Host machine 1 set, block mould 1 set, JQ350 mixer |
| Compatible Block Formats | Hollow, solid, paver, curbstone (mould change required) |
| Voltage & Frequency | To be confirmed before order |
| Certification | To be confirmed with manufacturer |
Application Suitability
| Application | Material or Output |
|---|---|
| Small to medium block production plants | Hollow and solid blocks from crushed stone, sand, cement and fly ash |
| On-site block production for construction contractors | Hollow blocks in 8-inch, 6-inch and 4-inch formats using locally sourced aggregate |
| Entrepreneurs establishing a first block plant | Standard hollow blocks and solid blocks with semi-automatic pallet handling |
| Existing manufacturers adding formats | Paving blocks and curbstones produced after mould change on the same host machine |
Why the Mixer and Conveyor Matter More Than the Press Itself
A block machine only runs as fast as the slowest station upstream or downstream of it.
I have watched plants sit idle because the mixer batch could not keep pace with a 25-second moulding cycle, leaving the press waiting between strokes. The QTJ4-25 block making machine production line addresses this by pairing the host machine with a JQ350 mixer, but the conveyor speed, pallet return loop and manual stacking rhythm still need to match. When any one of these falls out of sync, the quoted cycle time becomes a theoretical figure that never appears on the shop floor [NEED_CITE: line balancing principles in concrete block production]. Buyers who focus only on press specifications often discover the bottleneck after commissioning, when daily output stays well below the number on the quotation.
How Raw Material Feeding Connects to Press Cycle Consistency
The QTJ4-25 block making machine production line depends on a steady supply of homogeneously mixed material arriving at the hopper before each moulding stroke. The JQ350 mixer must complete its batch within the window between consecutive press cycles, or the operator must pause the machine. For mixes with higher cement content or finer aggregate, mixing time extends, which means the line either needs a larger mixer or an intermediate storage hopper to buffer supply.
Pallet Circulation and the Hidden Timing Constraint
Every 25-second cycle consumes one pallet loaded with freshly pressed blocks, and that pallet must travel to the curing area before the next empty pallet is fed into position. The 850 × 550 × 20 mm pallet size dictates how many pallets fit on a standard curing rack and how quickly they can be retrieved. If pallet return relies on manual trolley transport and the curing area is far from the press, the operator spends more time moving pallets than the press spends idle — but the press still waits [NEED_CITE: pallet circulation logistics in semi-automatic block plants]. This is why pallet quantity recommendations must be calculated against daily output and curing turnover, not guessed from a standard list.
Reading the Specifications Against Your Actual Production Target
The exciting force of 60 kN combined with vertical bed vibration at 2800 r/min and upper mould compression vibration determines how densely the concrete mix is compacted. For lightweight aggregate or high-fly-ash mixes, this vibration profile may require longer cycle times to achieve the block strength your market expects, which reduces actual hourly output below the rated 960 pieces per hour on 400×200×200 mm hollow blocks. The hydraulic station provides additional compaction pressure, but the interplay between hydraulic pressure and vibration force must be matched to your specific mix design rather than a generic catalogue setting. Moulding cycle figures are always format-dependent: switching to a smaller solid block mould with more cavities may shorten the cycle, while a larger paver mould may lengthen it.
What Happens When Upstream and Downstream Are Not Sized Together
When a buyer purchases the press alone and sources the mixer, conveyor and pallets separately, mismatched capacities surface during the first production run. A mixer that is too small forces the press into intermittent operation, cutting effective daily output in half. Pallets that do not match the curing rack dimensions or the forklift the buyer already owns create a secondary handling step that was never budgeted for. Voltage and frequency confirmed too late mean the motor-driven control system arrives configured for the wrong power supply, delaying commissioning by weeks [NEED_CITE: voltage and frequency standards by export market]. These are not machine defects — they are line integration gaps that could have been caught at the quotation stage.
Why Buyers Source the Complete Line from One Supplier
The host machine, JQ350 mixer, mould and pallets are specified as one system, so capacity calculations account for every station rather than the press in isolation. Mould options for hollow, solid, paver and curbstone formats are designed against the same pallet size, eliminating fit issues during changeover. The line layout document states which block format each output figure assumes, so buyers compare quotations on equal ground. Factory testing runs the complete line — mixer through stacking — at the buyer’s confirmed voltage and frequency before dispatch. Pallet quantity and material recommendations factor in the buyer’s curing area dimensions and existing forklift capacity, not a one-size-fits-all pallet count.
Documentation & Verification
- Line layout with capacity stated per block format and assumed mix design
- Machine specification sheet covering host, mixer and hydraulic station
- Mould drawing showing cavity count and format for each block type
- Pallet specification matched to curing rack and forklift requirements
- Voltage and control language confirmation signed before production
- Factory test record showing actual cycle time on buyer’s selected mould
Installation, Commissioning & Support
- Foundation plan sized to the 6400 × 1500 × 2700 mm footprint and dynamic vibration load
- Dedicated power circuit rated for the 17.9 kW total draw at buyer’s confirmed voltage and frequency
- Mixer and conveyor alignment verified on-site so material feed matches the 25-second cycle
- First production run supervised with cycle timing recorded for each block format
- Operator training on mould change procedure and pallet handling sequence
- Wear parts list for vibration components and hydraulic seals with reorder intervals
Before You Request a Quotation
Tell us which block format sells in your market and the daily volume you need to hit. Share your local aggregate type, cement grade and any existing mixer or forklift you plan to keep. Confirm the voltage and frequency at your site so the motor-based control system ships ready to run. If you already have a curing area, send its dimensions so pallet quantity can be calculated against your actual turnover rate.
Frequently Asked Questions
Q: How is line capacity calculated per block format, and what happens to cycle time when I switch moulds?
A: The 960 pieces per hour figure is based specifically on 400×200×200 mm hollow blocks at four pieces per mould. Switching to a different format changes cavity count and compaction requirements, so cycle time and hourly output must be recalculated. We provide a capacity table listing output for each mould you order, not a single blanket number.
Q: What supporting equipment is included versus what I source locally?
A: The standard package covers the QTJ4-25 host machine, one block mould set and the JQ350 mixer. Conveyor belts, pallet trolleys, pallet quantity and stacking equipment are configurable based on your site layout. Items like curing racks and forklifts are typically sourced locally to match your existing infrastructure.
Q: How do I size pallet quantity to my curing area and daily output target?
A: Pallet quantity depends on how many blocks you produce per day, how long blocks stay on the pallet during curing, and how many pallets your curing racks hold at once. We calculate this after reviewing your curing area dimensions and target output, ensuring the press never waits for an empty pallet to return.
Q: What voltage and frequency does the line require, and can the control display be set to my local language?
A: Voltage and frequency must be confirmed before production begins because the motor-based control system is configured at the factory. We ask buyers to photograph their distribution panel so the line ships matched to the local supply. Control language options depend on the specific motor controller fitted and should be specified at order.
Q: How do upstream mixing and downstream pallet handling need to be timed so the press is never left waiting?
A: The JQ350 mixer must deliver a fresh batch within the window between press cycles, and empty pallets must return before the next stroke. We map these intervals in the line layout document, flagging where a larger mixer, buffer hopper or additional pallets may be needed to maintain continuous operation at your target output.
