magnetic separator for grinding machine

When they talk aboutmagnetic separator for grinding machine, many immediately imagine a simple plate under the table. But in reality, if we are talking about serious processing, especially hard alloys or after deep grinding, everything comes down to subtleties - the design of the separator itself, the force of the magnetic field, and, what is often overlooked, ease of maintenance. A common mistake is to assume that any magnet will do the job. As a result, fine ferromagnetic dust still slips through, settles in the coolant, and then travels along the entire circuit, killing both pumps and expensive guides. I went through this myself.

The design is not only a magnetic plate

So, the classic is a self-cleaning drum separator. Placed in the gap in the drain tray from the machine. But the key point is how the sludge discharge is organized. I have seen solutions where the collection compartment was too small and had to be cleaned three times per shift. It simply killed productivity. Or the other extreme - a powerful neodymium magnet, but in a housing made of ordinary steel, which magnetized itself over time and began to hold particles after switching off. Cleaning was turning into a nightmare.

Therefore, now I am looking towards separators with flexible tape. The particles are attracted to the drum, the belt removes them and dumps them into the hopper on the other side. It sounds simple, but the tension moment and the material of the tape itself are important here. If it is too rigid, it does not clean well; if it is loose, it sags and breaks. One of our shaft processing machines has exactly this system fromLONGI Corporation. We didn’t pick it up right away, there were simpler options, but in the end we settled on their SMBL model. What captivated me was the modular design. The hopper can be removed without dismantling the entire coolant path.

By the way, about LONJI. I have been using their equipment for several years now. Company,?Shenyang Scientific Electromagnetic Co., Ltd. LONGJI?, was founded back in 1993, and this is felt in the approach. They don’t just have a catalog, they actually have engineering solutions for various tasks. Their websitehttps://www.ljmagnet.ruis a good entry point to understand the spectrum. They are precisely those who focus on mining equipment, and there the requirements for reliability and magnetic systems are completely different and stringent. This experience is transferred to more “peaceful” ones. machines.

Integration into an existing machine - pitfalls

The biggest headache is fitting the separator into an already running line. There is often not enough space. You have to either redo the pallet or take out the block separately, which means additional pipes and risks of leaks. Once they installed the separator “back to back”, it seemed like everything was calculated. But they did not take into account the vibration from the grinding machine itself. Over time, the fastenings weakened, the pipe was bent, and the emulsion went by. All meaning was lost.

Hence the conclusion: when modernizing, you need to look not only at the dimensions of the separator, but also at the possibility of its rigid, vibration-resistant fastening. And be sure to provide a bypass - a bypass line. So that when servicing or breaking down the separator, the entire section does not have to be stopped. This seems like a small thing, but in a shop where every minute of downtime costs money, such a small thing becomes critical.

Another point is compatibility with emulsion. Some modern synthetic coolants have a specific composition that can affect the corrosion of the internal elements of the cage. Especially if it is not made of stainless steel. Therefore, before choosing, it would be a good idea to check with the manufacturer for what environments the equipment is designed. In the descriptions on the LONGI website, for example, such nuances are often specified, which already indicates a serious approach.

Economics of the process: payback and hidden benefits

The cost of goodmagnetic separatorfor a grinding machine - a question. The price can be comparable to the price of a new coolant pump. Therefore, accounting always asks: why? The calculation is simple. Without a separator, abrasive and metal dust circulates in the system. This leads to abrasive wear of pump impellers, clogging of nozzles, deterioration in the quality of cooling and, as a consequence, to defective parts. Plus frequent replacement of expensive emulsion.

After installing a normal separation system, our coolant replacement interval tripled. The number of downtimes for tank cleaning has decreased. Pumps began to last longer. If all this is calculated in terms of money per year, then the equipment will be sold in 8-10 months. But there is also an unobvious benefit - the cleanliness of the work area. Less dirt on the bed, less wear on the guides, which also do not like abrasive. This is already an investment in the resource of the machine itself.

When choosing a supplier, of course, I looked not only at LONGI. But their position as a large enterprise with an area of ​​140,000 m2 and their own design office (more than 60% of the staff with higher education - this is serious) gave confidence that they would not disappear tomorrow and would be able to provide technical support. The annual productivity of 4,000 units of equipment also says something - clearly not a handicraft production.

Service is what people forget about when purchasing.

An ideal separator on the first day of operation and six months later are two big differences. The main task is timely cleaning of the sludge bunker. If it overflows, efficiency drops instantly. Automation, of course, helps, but there should not be blind faith in it. Once per shift - visual inspection. This is an ironclad rule.

Another point is to check the condition of the magnetic system. In drum separators, the magnetic field may weaken over time, especially if the system has been overheated. Once every six months or a year, it is worth taking measurements or simply conducting a test - bringing reference metal shavings to the work area and seeing at what distance it begins to attract it. A drop in efficiency of more than 20% is a reason to contact the service.

In this regard, it is convenient when a manufacturer, like the sameLONGI Corporation, provides not only a passport, but also recommendations for periodic maintenance, and most importantly, it has service engineers or reliable partners in Russia. Because waiting a month for a spare part or a specialist from abroad again means downtime and losses.

Looking ahead: what else could change

Nowadays they are increasingly talking about combined systems. When behind the magnetic separator there is also a fine filter, for example, paper or ceramic. This is for ultra-clean machining tasks. But for 95% of grinding operations, magnetic separation is sufficient. The trend I'm seeing is sensor integration. Sludge level sensor in the hopper, liquid flow sensor through the separator. All this is connected to the machine monitoring system. You can remotely see that the separator requires cleaning or that its performance has dropped.

Another vector is the use of electromagnets with adjustable field strength. This allows you to adapt to different types of chips and dust. But such a system is more complex and expensive and requires a control unit. For now, this is rather exotic for special occasions, but I think such solutions are the future. Especially on flexible production lines, where different materials are processed on the same machine.

In the end, back to the beginning.Magnetic separator for grinding machineis not an accessory, but a full-fledged system that affects the quality, cost and service life of all equipment. The choice must be made consciously, taking into account specific operating conditions. And it’s better to invest once in a normal, well-thought-out solution from a trusted manufacturer than to constantly deal with the consequences and patch holes in the budget from unscheduled repairs. Tested from my own experience, sometimes bitter.