Really something to pull out with a search magnet. Search magnet, why does a search engine need it and how to choose a search magnet? Degaussing search magnets

Search magnets are designed to detect, lift and capture various objects that are attracted by a magnetic field. Most often these are objects made of iron, but alloys of more noble metals can be attracted to the surface of the magnet. Good search magnets have only two components. This is a high power neodymium NdFeB magnet that provides magnetization and a steel case, which is both a magnetic circuit and protection. It focuses the magnetic field and directs it, thereby creating the maximum possible voltage on the working surface of the device. F - adhesion force is calculated based on the contact area, which is equal to or exceeds the working surface of the search magnet itself. If the search is carried out over a large area and further lifting of heavy metal objects is expected, it is recommended to use a search magnet with the largest possible area, it depends on the diameter of the magnet. The larger the diameter of the magnet, the larger the working surface area will be.

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Hello dear blog readers. Today I will tell you about another search. But he was extraordinary. I have long noticed the trend of increasing popularity of search with a search magnet. designed to search for ferromagnetic metals, noble metals - gold, silver are out of the question. Unless you are enchantingly lucky, and items made of precious metals will be stored in an iron box. Also, these magnets respond well to modern and Soviet coins, due to the presence in them of a high percentage of metals that react to the magnet. If you are attracted to this type of search, which is quite a budget option, because magnets are many times cheaper than metal detectors, remember the rules for working with a magnet, their list is very long. First of all, it is safety - be careful when removing small objects from the magnet - you can cut yourself.

It is worth keeping these devices away from electrical appliances, and most importantly, do not bring your hand to the attracting surface when there is a heavy object within its radius of action. Beware of heating the magnet, this will adversely affect its further operation.

Well, be careful when buying appliances - they are very often faked.

There are varieties of a search magnet, which depend on the force of attraction and the area of ​​attraction. So, one-sided and two-sided magnets are distinguished. I stocked up on one of the most reliable -. This type of magnet is especially strong, characterized by a constant attraction. These devices are unpretentious to the search conditions, but quickly lose their presentable appearance - they are overcome by rust. However, these devices are usually equipped with an anti-corrosion coating, so feel free to use them in water. The main advantage of neodymium search magnets is their high load capacity under constant thrust conditions. A serious drawback is the price, which has jumped sharply since 2009. Well, do not forget that the transportation of these devices when contacting mail services is illegal.

So, a good place to search with this device is the watery areas of the recent presence of a large number of people. These are various abandoned wells, mines, lakes and beaches. I did not want to risk with wells, so my friend and I went to a semi-abandoned village, Popazdra, whose main advantage was abandoned beaches. So, having arrived at the place, I want to note that transporting a magnet is not an easy task. Don't forget to put it in a special box with non-magnetic materials, which we did. If this is not the case, put a board or something plastic under the part that attracts.

Well, the report

So we got to the place and prepared for the search by preparing the magnet. The use of the magnet is quite easy - just move it over the surface to be studied. If you want to search in the water, tie the magnet to a rope and lower it into the water. Within a few hours, among our finds, there were no particularly valuable things - a bunch of small coins that do not differ in special value. But I still wanted to continue the search - suddenly the magnet will show its best side. So, having tuned in, we continued to explore the beach, slowly leaving for the field. And there luck smiled at us - we found several helmets of German and Soviet soldiers, and throwing the magnet further into the water, sailing on a small boat away from the coast, we pulled out the iron base of the wheel of the World War II time machine.

Good day, comrades!

Search magnets appeared on Survival... I think that simple tips on choosing it will be useful to many. The topic is kind of new.

Mass production of powerful magnets for household and industrial needs began more than seven years ago. At the same time, magnets found recognition among treasure hunters, who began to use this device for their own purposes, such as: searching and lifting metal objects in places hard to reach for metal detectors, etching rivers and other bodies of water, cleaning the soil from fine iron, preparing a place for searching with a metal detector, removal of iron from littered areas, as well as when digging up an old foundation, determining the magnetism of stones (to find out if they are fragments of a meteorite).
search magnet- This is a fully galvanized device, consisting of a body (N10 steel) and, in fact, the magnet itself (Fe-Nd-B alloy), most often equipped with a special eyebolt to which the cable is tied. The gap between the case and the magnet is filled with a special epoxy adhesive, which allows the device to be used both in fresh and sea water.

The search magnet can be stored and used at +/-50 °C. If the magnet is heated above 80 °C, it may become demagnetized. Subject to temperature regimes for ten years of operation, the magnet loses no more than two percent of the nominal value. Today's search equipment market provides a huge variety of magnets. The main thing in this variety is to choose a magnetic device that meets exactly your needs and physical capabilities. 1. When choosing a search magnet, first of all, it is necessary to be guided by the strength of its separation: the minimum holding weight is 30 kg, the maximum is 800 kg. The weight is indicated in the name of the model, for example, F=400 (where 400 is the pull-off force of this model). Most often, treasure hunters prefer 80-400-kilogram models of magnets. Moreover, magnetic devices up to 150 kg, called "expeditionary magnets" by professionals, are used to a greater extent for work on land, in particular for cleaning the surface of metal debris. But the main function of magnetic devices over 150 kg., actually "search", is to search for and raise iron objects from the bottom of reservoirs, rivers, lakes, etc. Eight hundred kilogram magnets, which are very bulky and inconvenient (due to their rectangular shape and two eyebolts instead of one), are extremely rarely used by search engines. 2. The maximum magnetization force is achieved under ideal conditions: if the contact areas are located at a small distance and perpendicular to each other, the object has a clean and smooth surface and the thickness of its steel coating is 5 millimeters. Thus, when choosing a magnet, the errors of the surfaces of objects associated with rust, irregularities, the thickness of the metal component, the magnetic properties of some metals (for example, stainless steel is somewhat weaker relative to iron), etc. are taken into account. 3. Also, when choosing a magnet, one should also take into account the fact that a very heavy magnet will quickly tire, so it is better to give preference to a magnet that has less weight but more power.
The most optimal and in great demand search magnets have the following characteristics: F = 80-400, weight - 130-1400 grams, height - 18-34 mm, diameter - 120-220 mm.

They have been known to mankind for a long time, but thanks to the development of industry, they were widely used only at the end of the 19th century. Along with production tasks, ferrimagnetic materials are also used in everyday life. One of the interesting, and most importantly - profitable ways, is the search for metal objects. Before you find out what a search magnet is, you need to know its main characteristics and properties.

Manufacturing materials

Most practical magnets are artificial alloys. Natural materials, in particular magnetic iron ore, do not have the required properties. They have small indicators of tearing force, susceptibility to rapid destruction as a result of mechanical stress. Therefore, for industrial purposes, ferrites are often used, which are placed during the manufacturing process. Their service life can be calculated for decades, and without loss of performance properties.

Unlike industrial designs, household designs of magnets are simple. Due to their small size, neodymium alloy - N-Fe-B is often used for their manufacture. To improve the mechanical strength and reduce the cost, iron and boron are added to the composition of the material. The result is a neodymium magnet, the search potential of which is still being revealed.

Their scope is wide:

• Furniture industry - door locks.
• Security systems - in combination with sensors.
• Calculation of angular velocity or angular position - used together with
• In search and archaeological expeditions.

For private use, there was also a rather interesting niche. In regions with a rich historical past, you can make a search magnet with your own hands and engage in practical archeology.

Security measures

Not many people know that certain rules must be followed to work with magnets. In most cases, large models have qualities that can harm both humans and technology.

Therefore, the following safety precautions should be followed:

1. Prepare a special container, the material of which does not have magnetic properties. It can be wood or thick-walled polymer. Install a warning sign on the surface.
2. For normal operation of electronic devices, the minimum distance from the magnet should be 10-20 cm.
3. Force fields adversely affect the operation of the pacemaker.
4. The space between the magnet and the metal must be free. Otherwise, injury may result from pinched limbs.

Design

To carry out search operations, it is necessary to carefully consider the design and take into account the specifics of operation. It is not enough to take the finished product, fasten it on a strong rope and go to the fields in search of treasures.

If you need to make a search magnet with your own hands, then a drawing is first drawn up. It indicates the overall dimensions of all elements, the material and method of their assembly. By following this simple step, many mistakes can be avoided. For example - if one part of the magnet must be open, then the method of attaching it to the protective casing is not taken into account.

The best option - the protective shell completely repeats the shape of the product. In this case, the likelihood of damage during transportation or during the search process is reduced.

Before manufacturing, it is necessary to determine the technical characteristics, which directly depend on the overall dimensions.

Options

With an increase in the linear dimensions of the magnet, its performance indicators increase. Depending on the task at hand, you should carefully approach the choice, since the cost of various models can range from 30 to 300 dollars.

But what is a search magnet without the right equipment?

Hull and lift elements

The protective shell is made of durable material. The best option is turning a steel billet followed by galvanizing. Such a product will become a reliable protection against mechanical damage, and due to the surface layer, it will not corrode for a long time.

Methods for attaching a magnet to a housing can be varied. But the most popular and practical are:

1. Production of a closed structure with a screw cap. Its tightness makes it possible not to be afraid of the harmful effects of water, even sea water.
2. Fixation with epoxy adhesive.

You can make a search magnet with your own hands in other ways. The main thing is to observe safety precautions and take care of the reliability of the entire structure.

For lifting, a strong cord is usually used, the breaking force of which should be at least three times the weight of the hold.

Practical use

But what is a search magnet without interesting finds? Due to its specific properties, it can be used where conventional metal detectors fail - in the aquatic environment. With proper skill, a large area of ​​the river bottom can be carefully explored in a day. Considering the vast historical past of almost every region of the country, there is sure to be a unique copy from the past centuries.

But you should not entertain yourself with the thought of getting rich soon - the finds made by the search magnet are diverse and far from always of value. It is required to literally shovel the mouth of the river to find something worthy of attention. Therefore, before starting a mini-expedition, it is recommended to familiarize yourself with the history of the region in order to increase the likelihood of a successful “catch”.

No need to think that all the “fishing” will come down to throwing a magnet at a distance and pulling it back by the cable. To increase your chances of success, you need to follow a few rules for working with search magnets.

1. Practice throwing in an open area with soft ground to assess your strength and "shoot". Otherwise, the magnet may not fly where it was expected, and even cripple you.

2. Take care of the cable, it must be strong and bright (in case of entanglement in snags, it will be easier to unravel). Choose the optimal length so that the cable does not get tangled. It depends on the depth of the reservoir, which, according to the mind, needs to be figured out in advance.

3. For “fishing” with a magnet, you need a boat, and it’s better not an inflatable one, because. a large pile of rusty items can damage the craft.

4. Do not keep the magnet stationary in one place. This can cause it to magnetize something so heavy that it breaks the cable.

5. The best way is to throw the magnet and pull it back at medium speed (not too fast). You can also just walk near the shore in the swamps, dragging a magnet along with you.

6. If the bottom of the reservoir is heavily silted, then it makes sense to attach the search magnet not to the cable, but to the pole, and deepen it by pressing the pole with force.

7. After each cast in some waters, you have to remove a layer of scale from the magnet, so grab gloves and rags.

8. After repeated use, the galvanized layer usually peels off the surface of the magnet, and it begins to rust. To delay this phenomenon, it is advisable to clean and dry the magnet after each search session.

9. It is better to transport the magnet in a wooden case, and do not keep it close to the electronics. The mobile phone will definitely break in an unequal battle with neodymium.

But what can be caught on a magnet?

Catch on a magnet in a lake near one of the European towns.

“Yesterday I caught three scuba divers, two divers and one man with steel balls with such a tackle. The latter resisted the longest,” says one of the searchers.

And if the jokes aside, then you will not find gold-diamonds with a search magnet - precious metals are not magnetized. However, following the basic rules, you can catch up to 100-130 kg of scrap metal in a couple of hours in a city or rural reservoir. If you turn it in, you will get a good amount.

You can buy a powerful neodymium magnet, which can lift hundreds of kilograms at a time, at