DN 300 (80 °C, 10.000 Gs, 66 N)

The hopper magnet (sometimes also referred to as a magnetic grid) is intended exclusively for industrial use, it ensures perfect cleaning of your dry mixtures from ferromagnetic impurities (by ferromagnetic impurities we mean fully magnetic metals such as iron, nickel, cobalt and alloys containing iron, not paramagnetic, very weakly magnetic materials). It is intended for use in circular hoppers so that it perfectly follows the inlet to the connected technological equipment.

 For proper function, the purified mixtures (the material that you pour through the magnetic grid) must be:

• homogeneous
• dry with good flow properties so that clogging (overloading) does not occur, see below.

The hopper magnet (magnetic grid) is suitable for use only in non-continuous operations (during its manual cleaning, the flow of the purified material must be stopped). It is installed only in vertical hoppers, the tubes must be horizontal (if vertical installation is not possible, do not use this product and contact us to select another hopper magnet or another magnetic separator, or to confirm the suitability of its use), for example in the food, chemical, plastics industries, in agriculture, in the waste processing industry, and in the field of building materials production, see the list of suitable materials below.

The hopper magnet is used as a preliminary stage for protecting technology so that metallic ferromagnetic impurities do not enter equipment that they could damage, for example mill blades, crushers, nozzles of regranulation and granulation lines, injection molding machine nozzles, extrusion presses, pressing machines, shredding equipment, fine sieves, ceramic pressing machines, glass presses, etc. Anywhere where material is collected in a hopper before the technology. It can also be used for purifying the mixture to achieve the highest possible purity, when the grid is placed at the end of the production process just before packaging, dispatch, so that no contamination by metallic ferromagnetic material occurs during further operations in the production plant (for example during manual packaging of products through auxiliary hoppers). In this case, immediate sealing of the purified material into sealable packaging or into other sealable containers is assumed. Thanks to the excellently assembled magnetic circuit and the flow labyrinth created by the distributing circular steel, a high capture of ferromagnetic impurities is achieved (please read carefully below the description of what ferromagnetic metallic impurities this magnetic grid can capture).

The grain size (fraction, size) of the purified material may be maximum up to a diameter of 3 mm (3x3x3 mm), of regular shape; the material must be free-flowing, dry, non-sticky and without lumps so that the magnetic grid does not become overloaded (clogged) with material; during free-flowing pouring it must not have a tendency to arch (clump into compact masses), to retain itself spontaneously and thus prevent free flowing through this hopper magnet. Examples of such materials (which flow poorly) may be moist, greasy materials, but also materials that at first glance appear dry and seemingly free-flowing, yet their natural property is that they flow poorly. Such an example is smooth, very finely milled flour or various very finely milled starches. Materials that we recommend and which, according to our expert opinion and experience, are suitable for pouring (purifying) through this hopper magnet (magnetic grid) are listed below (we draw attention to the above-mentioned maximum permissible fraction/grain size). In the event that the material from which you require metallic ferromagnetic impurities to be separated (material for purification) is not found in the list below, do not use this product and contact us for closer clarification and possible recommendation of another magnetic separator/grid or approval that this type is also suitable for magnetic separation from your material.

List of suitable materials for magnetic separation using a magnetic grid:

• granulated sugar
• powdered sugar (beware of material overloading here, we recommend pouring more slowly and distributing evenly over the entire surface of the hopper magnet) 
• cereals, various types
• lentils (in the case of frequent use for large quantities of lentils, abrasion may occur; we draw attention to possible faster wear of the cover tubes)
• crushed cocoa beans
• crushed PET bottles (beware of material overloading here, we recommend pouring more slowly and distributing evenly over the entire surface of the grid; rather suitable for smaller capacity quantities)
• rubber regranulate
• rubber granulate
• chili seeds
• animal feed, free-flowing, characteristically similar to flour up to coarser fractions, however max. grain size 3 mm (must not be abrasive)
• coconut flour
• cocoa
• flour (beware of material overloading here, we recommend pouring more slowly and distributing evenly over the entire surface)
• poppy seeds (only poppy seeds, not whole poppy heads)
• ground corn
• meat and bone meal
• matcha powder
• pudding powder (arching and clogging with material may occur, pour slowly and evenly over the entire surface)
• plastic granulate and regranulate
• plastic granulate (well crushed without residual fibers)
• ash (not hot, but cooled to the working temperature of the magnetic grid)
• food-grade bulk non-abrasive mixtures
• dried milk
• dried chocolate
• dried coconut
• dried herbs
• dried spices (finely ground or very finely crushed)
• dried instant soups
• dried whey (beware of material overloading here, we recommend pouring more slowly and distributing evenly over the entire surface)
• sesame seeds
• enamel or glass mass (we draw attention to increased abrasion and increased risk of wearing through the cover tubes)
• salt (we draw attention to possible shorter service life due to the material used, depending on frequency of use)
• bulk starches e.g. corn starch
• building materials (free-flowing and non-abrasive)
• tapioca pearls

We emphasize again that the materials must be dry, free-flowing (must not have a tendency to arch), non-abrasive, with a maximum regular granulometry up to a diameter of 3 mm (3x3x3 mm). The throughput capacity varies depending on the material from which you require ferromagnetic impurities to be separated, it cannot be determined unambiguously, it differs for each type of material. In the event that you are not sure about the throughput, capacity passage, do not use this hopper magnet, contact our sales and technical department for recommendation of another type of magnetic separator or approval of the use of this type.

Please note that the wall thickness of the cover tube is very small in order to achieve high magnetic induction (magnetic force) and pull-off force on its surface. Therefore, please also consider the height from which you will pour the material onto the hopper magnet (drop height). The height from which the material is poured onto the hopper magnet must not exceed 1 m. However, this is individual for each type of material. It is not possible to precisely determine and prescribe from what height a given material should be poured. In the case of pouring from a great height, bending or puncturing of the cover tubes and damage to the entire product may occur. In the event that the height from which your material will be poured onto the hopper magnet is higher than 1 m, do not use this product and contact our sales and technical department for recommendation of another type of magnetic separator or approval of the use of this type.

This hopper magnet captures (separates) metallic ferromagnetic particles from a size of 1 µm and smaller (ferromagnetic in nature, immeasurable, magnetic dust) up to a size of dia. 3 mm (3x3x3 mm), which is the maximum fraction (size) of material that may fall onto the hopper magnet and that may be poured through it. In exceptional cases, this hopper magnet may also capture larger metal objects up to a size of dia. 5 mm (5x5x5 mm). However, the incidental occurrence of these impurities is assumed to be max. up to 1% of the total hourly capacity of the poured material (regular cleaning of the magnetic grid from ferromagnetic impurities is assumed; this does not mean that the entire 1% of larger ferromagnetic impurities may remain on the hopper magnet throughout the pouring of the hourly capacity of the poured material). The content of these larger ferromagnetic impurities must not be higher. In the event that the occurrence of these larger ferromagnetic impurities in your material is higher, do not use this hopper magnet and contact our sales and technical department for expert advice.

Larger objects than those stated (max. diameter 3 mm, 3x3x3 mm) must not fall onto the hopper magnet, except for ferromagnetic impurities described above in incidental quantities. In the event that you are concerned about the presence of even larger ferromagnetic or other impurities, admixtures, it is necessary to install a sieve with a mesh size of max. 3 mm upstream so that these larger unwanted objects are captured before entering the hopper magnet (after installing the sieve, it is necessary to consider reducing the capacity load and throughput of the hopper magnet). The sieve is not included in the delivery of the hopper magnet. We also draw attention to the possibility that your material may contain a large amount of fine metallic impurities (very fine metallic magnetic dust smaller than 1 µm), which may so-called coat the magnetic tubes and block the hopper magnet (fine magnetic particles bind even the poured material to themselves and overload the entire system). At the same time, the magnetic force/efficiency of the hopper magnet will be greatly reduced. In the event that the magnetic tubes immediately after starting the passage of material through the hopper magnet become coated and completely “hidden” in iron dust, this is not a defect of the hopper magnet, but it is necessary to strengthen the magnetic separation with another magnetic separator or clean the hopper magnet more frequently; your material probably contains a very large amount of ferromagnetic particles. 

If you are not able to ensure:

• the absence of larger particles in your material than a diameter of 3 mm (3x3x3 mm) 
• an amount of less than 1% of larger ferromagnetic particles (up to 5 mm) in the hourly capacity
• minimal occurrence of fine metallic dust in your material

do not use this magnetic grid and contact our sales and technical department for recommendation of another type of magnetic separator or approval of the use of this type.  

The hopper magnet is designed to capture as many metallic ferromagnetic impurities as possible. However, everything depends on the amount of these ferromagnetic impurities present in your material. It is not possible to bindingly guarantee the capture of all ferromagnetic impurities. It is always necessary to consider the specific technology and capacities. If necessary, other types of magnetic separation/magnetic grids/hopper magnets must be installed upstream or added. Please do not rely solely on this one hopper magnet. In the event that you are not sure, do not use this type of hopper magnet and contact our experts in the field of magnetic separation at any time.

If you place the hopper magnet into your own structure (box, hopper, chute...), please note that such structures must not be made of metallic (magnetic) material. There is a risk of injury and significant reduction of magnetic force. All structures into which the hopper magnet is placed must be made of non-magnetic materials. The minimum distance of metallic (magnetic) structures from the hopper magnet is 200 mm.

The hopper magnet must not be used for the separation of stainless steel (generally referred to as stainless), even if it appears magnetic/paramagnetic (such materials may be, for example, after passing through various crushers or after other forms of deformation; likewise these paramagnetic stainless steels may be used in the manufacture of various sieves). 

The hopper magnet is not intended for the magnetic separation of non-ferrous non-magnetic metals, nor for the magnetic separation of parts or their components that contain ferromagnetic metals (e.g. plastic parts with molded-in residues of metal parts, crushed window frames with residues of metal strips, wooden pellets with pressed-in fine wires...). In the event that you need to separate such ferromagnetic impurities as well, do not use this hopper magnet and contact our experts in the field of magnetic separation, who will advise you which other magnetic separator to use or what type to supplement your separation assembly with.

Please note that during cleaning of the hopper magnet it is not possible to use pressurized water nor to soak the magnetic cores. Only a dry cloth may be used for cleaning or well-dried compressed air for blowing off residual metallic impurities and separated material.

When cleaning the hopper magnet, be very careful, the magnetic cores are very strong and their attachment to metallic objects may cause injury by pinching or pressure snapping. Do not place them on anything magnetic (tables, workbenches, stair treads, floors...).

This hopper magnet is not intended for use in any environment classified as an explosion hazard environment (ATEX).

The hopper magnet is intended for indoor use only. Do not install outdoors.

Procedure for measuring magnetic induction

The measurement is performed using a standard gaussmeter with a probe thickness of 0.75 mm at the point with the structurally highest magnetic induction - at the pole extensions or at the lowest point of the arc of the magnetic circuit. We repeat the test 3 times each time at a different point of the magnetic circuit and calculate the average magnetic induction.

Procedure for measuring pull-off force

We measure using a polished steel standard with a diameter of 10 mm and a height of 20 mm. The measurement is performed at the point with the structurally highest pull-off force - at the pole extensions or at the lowest point of the arc of the magnetic circuit. We record the force at which the standard detached. We repeat the test 3 times and calculate the average pull-off force.

For your information, 10 N = approx. 1 kg.

As confirmation of the measurement and guarantee of the measured values, we issue an original measurement protocol, which is included with every piece of magnetic separator delivered and is issued specifically for your particular hopper magnet (the protocol states the stock and production number).

Operating temperature: 

from -20 °C to +80 °C (from -4 °F to +176 °F)

The hopper magnet is fitted with magnets with a temperature resistance of 80 °C. It can therefore be used up to this maximum operating temperature. Please note that in such a case the entire structure of the hopper magnet will heat up to such a high temperature. In this case, it is not possible to handle the hopper magnet in ordinary work gloves, but it is necessary to use heat-resistant gloves.

Exceeding the operating temperature is possible in certain cases, however it is important to realize that it may lead to impairment of the functionality of the equipment or shortening of its service life. In such a case, consultation with the manufacturer is necessary to clarify to what extent the equipment can be exposed to higher temperatures without damage and while maintaining safe operation.

WARNING: 

The resulting pull-off force and magnetic induction depend on many factors - e.g. on the dimensions of the standard, the air gap between the standard and the tested magnetic circuit, the thickness of the measuring probe, surface contamination, the surface finish of the standard, etc. The stated values of pull-off force and magnetic induction were measured under ideal conditions given by the test environment. However, these values may change depending on the specific type of environment, where e.g. operating conditions and subsequent wear may affect the efficiency of the product and the measurement results. The stated values must therefore be considered indicative and any deviations from them cannot be regarded as a defect. To determine the exact value of magnetic induction and pull-off force in a specific case, it is necessary to carry out your own measurement. In the event that the determined pull-off force values are not sufficient for you because they do not correspond to the stated values, you may use the guaranteed option of returning the goods within 30 days under the conditions set out in the terms and conditions and purchase another type of magnetic separator. These 30 days serve precisely for testing the goods, and after this period the seller may refuse the return of the goods.

Copyright:

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