China is one of the world's largest makers of concrete block and brick machines, paver (interlock) lines and kerbstone equipment. Options range from small manual machines to fully automatic lines run by a PLC. The right machine depends on what you want to make, how much you need per day, the raw materials you have and your project budget.
This guide covers the machine types, the parts of a complete production line, how to work out real output and what to check before shipping, so you don't end up with a machine that never delivers the promised output.
What can a block machine make?
A concrete block machine is essentially a press that uses vibration and pressure to form a mix of cement, sand and aggregate inside a mould. By changing the mould, the same machine can make different products, including:
- Hollow blocks in sizes such as 400×200×200, 400×200×150 and 400×200×100 mm.
- Solid bricks and small concrete bricks.
- Pavers (paving stones) in shapes such as rectangular, S-shape and hexagonal.
- Kerbstones for pavement and road edges.
- Grass pavers for car parks and paths.
- Insulated blocks and other special products, depending on the mould.
Note: pavers and kerbstones usually need a machine with a face mix unit, which adds a fine, coloured top layer that improves appearance and wear resistance.
Machine types by level of automation
Manual and small machines
These need more labour to fill the mix and move the product. They suit very small projects or production for your own use.
Semi-automatic machines
Some stages, such as vibration and pressing, are automatic, while workers handle feeding or moving pallets. A middle option on cost and output.
Fully automatic machines
These run on a PLC and a hydraulic station, with feeding, pressing, vibration and pallet handling all automated. Output is higher and quality more consistent, and they need fewer workers, but the investment is larger.
Stationary and mobile machines
- Stationary machines make blocks on pallets that are then moved to the curing area. This is the most common type in factories.
- Mobile (egg-laying) machines move across a smooth concrete floor and lay blocks directly on the ground, without pallets. They cost less but need a lot of floor space, and quality is harder to control.
How to read Chinese model names such as QT4-15 and QT10-15
Many Chinese manufacturers use names like QT4-15:
- The first number (4): the number of 400×200×200 mm hollow blocks made per cycle.
- The second number (15): the approximate cycle time in seconds.
So a QT10-15 makes about 10 blocks of that size per cycle.
But this naming isn't a standard shared by every factory, and real cycle time varies with the product, mould and mix. Always ask for a written output table for every product you plan to make, not just the standard block.
Parts of a complete block production line
An automatic line is more than the press. Its main parts are:
- Batching machine: weighs sand and aggregate in set proportions.
- Mixer: usually a twin-shaft mixer, such as the models sold in China as JS500 or JS750 according to batch size.
- Cement silo with a screw conveyor and cement weighing system.
- Belt conveyor that carries the mix from the mixer to the block machine.
- The block machine with its hydraulic station and control panel.
- Face mix unit for pavers and kerbstones.
- Moulds for each product.
- Pallets the blocks are formed on, made of wood, bamboo, plastic, steel or GMT fibre.
- Stacker that stacks finished pallets for transport.
- Curing area or chambers where blocks harden before final stacking.
- Forklift or transfer carts to move pallets around the plant.
Some cheap quotes say "complete production line" but leave out the silo, pallets or stacker. Ask for a detailed list of every component and its quantity.
How to work out real output
An illustrative example for a QT4-15:
- Blocks per cycle: 4 (400×200×200 mm).
- Cycle time: 15 seconds.
- Cycles per hour: 3,600 ÷ 15 = 240.
- Theoretical output per hour: 240 × 4 = 960 blocks.
Real output is lower than theoretical because of pallet changes, feeding stops, maintenance and mould changes. It is realistic to plan on roughly 70–80% of the theoretical figure, or about 670–770 blocks per hour in this example.
For pavers, output is usually measured in square metres per hour or per shift, and depends on the stone's shape, thickness and the number of pieces per mould.
This example is for illustration only. Get written output figures from the supplier for each product.
Raw materials and the mix
A block mix usually contains cement, sand, fine aggregate and water. Depending on what is available locally, fly ash, stone dust or crusher fines can be added.
Mix proportions depend on the strength the product needs. So:
- Describe your local raw materials to the supplier, ideally with samples or sieve analyses.
- Ask what block strength to expect with those materials.
- Ask for the factory test run to use materials close to yours.
Moulds: the most important part after the machine itself
Mould quality determines dimensional accuracy, product appearance and production life.
Ask about:
- The steel used in the mould.
- Heat treatment or carburising to harden the mould surface.
- How it is welded and cut (laser or CNC cutting gives higher accuracy).
- Expected mould life in cycles.
It is a good idea to order a spare mould for your highest-volume product, especially for projects far from China.
Space, power and labour
Before you buy, plan for:
- Factory space: for the machine, mixer, silo, raw material storage, curing area and finished product yard. The curing area alone can need a lot of space.
- Power: ask for the line's total power in kW and the voltage and frequency it needs. Chinese machines are often designed for 380 V, 50 Hz, so ask for a version that suits your country, such as 60 Hz in Saudi Arabia.
- Water for the mix and curing.
- Labour: headcount varies a lot between manual and automatic lines, so ask the supplier how many workers each shift needs.
What drives the price of a block line?
Prices vary widely depending on:
- The level of automation and machine size.
- The number of moulds and whether a face mix unit is included.
- Which line components are included: mixer, silo, stacker and pallets.
- The brands of key components, such as the control system, hydraulic parts and vibration motors.
- The number of pallets; an automatic line may need hundreds.
- Installation, training and engineer travel.
- Shipping, since a full line can need several containers.
So don't compare two quotes on the total price alone. Compare the component list and specifications of each.
What to check before shipping
- A real test run of the machine with the moulds you bought, with video of a full cycle.
- Cycle time measured on the product you will actually make.
- The blocks produced: dimensions, edges and how well they hold together.
- Component brands written into the contract: control system, hydraulic valves, vibration motors and electric motors.
- Weld and frame quality, and plate thickness on parts exposed to vibration.
- Moulds: dimensions, finish and treatment.
- The packing list: check every component and spare part against the contract before the container is closed.
- Electrics: voltage and frequency on the rating plates.
It is best to have the inspection done by a party independent of the factory, with a detailed photo and video report.
Shipping and installation
A block line usually ships in 40ft containers. Large parts such as the silo may need an open-top container or a flat rack, or the silo can be shipped knocked down.
The contract should state clearly:
- Does the price include an engineer to install, commission and train?
- Who pays for flights and accommodation?
- How many days installation takes.
- Which spare parts come free with the line.
Warranty and spare parts
Ask how long the warranty is, what it covers and what it excludes, such as moulds and consumable parts.
With the first order, ask for the fastest-wearing spares, such as hydraulic seals, belts, vibration motor bearings and some electrical parts. Waiting for a small part from China can stop a plant for weeks.
Common mistakes when importing a block machine from China
- Relying on the theoretical output in the advert instead of working out real output.
- Buying a machine without face mix and later wanting to make pavers.
- Overlooking the number of pallets needed and the size of the curing area.
- Not specifying the right voltage and frequency for your country.
- Accepting a "complete line" without a detailed component list.
- Not testing the machine with the actual moulds before shipping.
- Not ordering spare parts with the first shipment.
How we work with you
China Aurora (Guangzhou Aurora Trading Co., Ltd.) is a Guangzhou-based company that sources machinery and production lines, inspects quality and ships from China. This is how we help with your block or paver plant:
- You send us the products you want to make, the daily output you need, your raw materials and your country's voltage and frequency.
- We shortlist and vet suitable factories, and send you quotes you can compare, each with a detailed component list.
- We attend the factory test run with your moulds and send you the video and measured cycle time.
- We inspect the line before loading and check the packing list against the contract.
- We arrange shipping to your country and coordinate the factory engineer's visit for installation and training.
Send us your project details on WhatsApp at +86 185 2028 8213 for a quote.
FAQs about block, brick and paver machines
Can the same machine make blocks and pavers?
On many machines, yes, by changing the mould. But good-quality pavers usually need a face mix unit, so check the machine has one or can take one later.
What is the difference between a QT4 and a QT10 machine?
The number usually indicates how many standard blocks are made per cycle, so a QT10 makes more than twice as many per cycle as a QT4, and needs a different level of investment, space and staffing.
How long before blocks are ready to sell?
It depends on the mix, the curing method and the weather. Products usually need a curing period before stacking, then more time before sale to reach the required strength.
Do Chinese factories send an engineer to install the line?
Many do, but terms vary. Put the number of days and who pays for travel and accommodation in the contract.
Can crusher fines be used in the mix?
In many cases yes, depending on grading and cleanliness. It is best to test the mix with your materials before you commit to a machine.
Conclusion
A successful block, brick and paver project starts with defining the product, daily output and raw materials, then choosing a line with a clear component list, working out real rather than theoretical output, and testing the machine with the actual moulds before it ships.
If you want us to handle factory selection, inspection and shipping for you, send your project details on WhatsApp at +86 185 2028 8213.