China suspended magnetic separator/iron separators

China suspended magnetic separator is not just a piece of equipment. It is the first line of defense for conveyors, crushers, mills and packaging lines. We've seen one forgotten nail in a grain stream damage a hammer mill rotor in 47 minutes. We observed steel wool in the cement mix causing emergency shutdowns every 11 shifts. And each time the solution was the same: reliablesuspended magnetic separator, installed strictly according to calculation - not higher, not lower, not “somewhere above the tape.”

Why a hanging magnet works where filters and grilles fail

Iron separators of this type operate according to a simple but immutable physical law: the force of attraction decreases with the square of the distance. The hanging magnet is placed directly above the conveyor - at the minimum possible height from the material. As a result, even weakly magnetic inclusions (scale, cast iron dust, fragments of worn parts) are reliably detected. We checked: when raising the magnet by only 50 mm, the efficiency of removing particles up to 3 mm decreased by 68%. Devices with a vertical pole ("polar type") provide up to 30% more force compared to classic radial ones - this is confirmed by tests in the LONGI laboratory in Fushun.

The main advantage is zero flow resistance. Not a single grate can withstand the load when processing hot sinter or wet sand. Not a single electromagnet will work without overheating in 24/7 mode in a fertilizer workshop. A permanent magnet based on neodymium alloy NdFeB works for years without power, without maintenance, without stopping. Its strength does not depend on the network voltage. We installed such iron separators in the coal mines of Heilongjiang - at −35 °C they retained 92% of the declared induction.

Three mistakes due to which even the best Chinese suspended magnetic separator does not save

We analyzed 42 cases of metal re-entry into equipment. In 31 cases, the problem was not in the magnet - but in its application:

• Incorrect suspension height.Installers often “lift to pass”, but do not take into account the sagging of the belt under load. Solution: use adjustable brackets with a laser level and measure the gap at maximum load.
• No pre-cleaning.Large fragments (bolts, scraps of reinforcement) must be removed before the magnet - otherwise they hit the body, deform the protective shell, and create a “shadow” for small particles. We recommend combining a hanging magnet with a grid fuse in front of it.
• Ignoring speed and material layer.When the belt speed is higher than 2.5 m/s or the layer thickness is more than 150 mm, the efficiency drops sharply. Then you need a magnet with increased induction (up to 12,000 Gas) and an increased working surface area - not “universal”, but precisely calculated.

How to choose - without marketing promises and technical pitfalls

Don't focus on weight or size. Look at three numbers:

1. Maximum material layer thickness,which guarantees the capture of particles of 1–2 mm (indicated in the passport, not in advertising);
2. Working induction on the surface of a magnet(not “in the core”, but precisely in contact with the material - real values ​​from 8500 to 11,500 Gauss);
3. Magnetic system service lifeat temperatures up to +80 °C (for high-quality neodymium assemblies - at least 10 years without degradation).

Experience shows: if the manufacturer does not indicate these parameters in the specification, he does not control the manufacturing process. At Shenyang Longji Scientific Electromagnetic Co.,Ltd., all three values ​​are tested on each unit. On the websiteljmagnet.ruTest reports are available for models LJM-HS-800 and LJM-HS-1200 - with photos of measurements and graphs of force versus distance.

This is not the purchase of equipment - it is the implementation of a security system

A suspended magnetic separator is a technological safety element. It doesn't improve performance. It prevents downtime. Reduces wear. Protects staff. We believe that if the cost of one hour of crushing complex downtime exceeds the price of a magnet, the decision is made unambiguously. Not today, but yesterday.

LONGI Corporation has been producing such iron separators since 1993. More than 1,200 people, 140,000 m² of production space, 4,000 pieces of equipment per year - these are not numbers from the presentation. This is a guarantee that yourChina suspended magnetic separatorwill work as intended: quietly, reliably, without failures. Because it was not just collected. It was calculated for your feed, your material, your mode.