Block Making Machine in Ghana: What to Specify Before You Compare Quotes

Choosing a block making machine in Ghana starts with a written specification, not a price list. A supplier asked for a machine will send a machine. A supplier given your shift output, product mix, available power, pallet size and yard area will send a configuration that actually runs on your site. The sections below cover the four items to settle before you request any quotation, plus the two that decide whether the first quotation is even comparable to the second. Nothing here asks you to know Ghana. It asks you to know your own yard.

1. Fix the shift output before you ask for a price

Output comes first because it sets the frame size, the power and the price at the same time. Three figures show the steps on one standard product: the QST8-15 reaches 90,000 standard bricks in an 8 hour shift, the QST1200 reaches 120,960, and the QST1800 covers 165,000 to 220,000 on the same 240 x 115 x 51 mm brick. Write your target as blocks per shift, not blocks per day, and state the shift length you really run.

A buyer who writes 8,000 blocks a day is specifying a different plant from one who writes 60,000 a day, and no quotation can hide that gap. Once the shift figure is fixed, everything downstream gets a size: the mould area, the pallet, the hydraulic unit and the power supply.

Give the figure in the product you sell most, because a press rated at 220,000 standard bricks in 8 hours makes 27,000 to 36,000 hollow blocks of 390 x 190 x 190 mm in the same shift. Each cycle fills a bigger mould, so the count falls while the machine works just as hard.

2. The product mix decides the mould and the pallet

The mix of products you sell decides the tooling, and the tooling decides what the machine can be asked to do. Three shapes cover most yards: a solid standard brick of 240 x 115 x 51 mm, a hollow block of 390 x 190 x 190 mm, and a paver of 200 x 100 x 60 mm. Each one needs its own mould, and the hollow block returns far fewer pieces per shift than the solid brick.

Write the sizes in millimetres and say which product carries your volume. A yard that sells mostly pavers should be specified around pavers from the start. A yard that sells mostly 390 x 190 x 190 mm blocks should make the hollow mould the default and treat the solid brick as the changeover, not the other way round.

3. Write your available power in kilowatts

Power is the item most often left blank and the one that cannot be changed later by better negotiation. Our presses step from 22.9 kW on the QT4-15, to 37.4 kW on the QT5-15, to 44.9 kW on the QST8-15, to 57.6 kW on the QST1200, and up to 104 kW on the QST1800. Write the figure you can hold at the panel, not the number on the transformer plate.

Induction motors pull roughly 5 to 7 times their rated current at start, so a 44.9 kW line does not behave like a 44.9 kW load when it kicks. Tell us whether you run on the grid, on a generator, or on both, and the voltage you have. We build the machine to the supply you name. The QST8-15 needs about 45 kW of supply and a workshop of roughly 10 x 4 m, so your first two numbers set both the electrical room and the building.

4. Pallet size and blocks per mould

The pallet is the surface each block is formed on, and its size sets the mould layout. Three sizes cover our range: 980 x 860 x 22 mm on the QST8-15, 1,350 x 880 x 25 mm on the QST1200, and 1,400 x 1,400 x 30 mm on the QST1800. A larger pallet carries more blocks per mould, so a line with a bigger pallet needs fewer cycles to reach the same shift figure.

Blocks per mould is the number to put beside the pallet, because the cycle time is fixed. The QST1200 produces 63 standard bricks per mould, and the QST1000 produces 51. When you request a quotation, ask for the pallet dimensions and the pieces per mould in writing. A quotation that lists only a model number and a price has not told you what you are buying.

5. Site, curing area and cycle time

The cycle time of the press is between 15 and 25 seconds, depending on the model and the product. At a 15 second cycle the machine starts and stops more than 140 times an hour, so the electrical supply, the hydraulic oil temperature and the pallet handling all have to keep up. Match the handling and the curing area to that rate before you order, because green blocks have to leave the machine as fast as it makes them.

Curing is not a machine function. Strength develops over several days of hydration, and it depends on temperature and humidity in the yard, not on the press. Keep the water to cement ratio between 0.35 and 0.45. Adding water to loosen the mix raises the cement bill and lowers strength at the same time, so plan a covered or shaded curing area sized to hold your daily output, including the pallets standing in it.

6. The six lines to put on your enquiry

Send these six lines and our engineers can size the plant in one pass:

• Shift output in blocks per 8 hour shift, in the product you sell most.
• Product mix and sizes in millimetres, such as 240 x 115 x 51 mm or 390 x 190 x 190 mm.
• Available power in kilowatts, and whether it comes from the grid, a generator or both.
• Preferred pallet size, or the pallet size you already use if you are replacing a line.
• Yard and building area in metres, including the space you can give to curing.
• A sample of your raw material, so we can check the mix before we quote a mould.

What happens after the six lines arrive

With those lines on the page, a quotation becomes a proposal you compare line by line instead of a number you have to guess at. We check the power figure against the model, the product mix against the mould list, and the pallet against the mould layout, then come back with the model and the numbers that fit your shift. The aim is that the first quotation you read is already the one you can act on.