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neodymium magnets

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BM 550x180x70 [4x M8] - magnetic beam

magnetic beam

Catalog no 090221

GTIN: 5906301812562

5

length

550 mm [±1 mm]

Width

180 mm [±1 mm]

Height

70 mm [±1 mm]

Weight

35320 g

5708.18 with VAT / pcs + price for transport

4640.80 ZŁ net + 23% VAT / pcs

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BM 550x180x70 [4x M8] - magnetic beam
Specification/characteristics BM 550x180x70 [4x M8] - magnetic beam
properties
values
Cat. no.
090221
GTIN
5906301812562
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
550 mm [±1 mm]
Width
180 mm [±1 mm]
Height
70 mm [±1 mm]
Weight
35320 g
Manufacturing Tolerance
±1 mm

Magnetic properties of material

properties
values
units

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

properties
values
units
Vickers hardness
≥550
Hv
Density
≥7.4
g/cm3
Curie Temperature TC
312 - 380
°C
Curie Temperature TF
593 - 716
°F
Specific resistance
150
μΩ⋅Cm
Bending strength
250
Mpa
Compressive strength
1000~1100
Mpa
Thermal expansion parallel (∥) to orientation (M)
(3-4) x 106
°C-1
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
°C-1
Young's modulus
1.7 x 104
kg/mm²

Shopping tips

A magnetic beam (plate separator) is a powerful industrial magnet in a stainless steel housing. It is usually mounted above the conveyor belt (so-called overbelt) or in chutes. The main goal is to protect crushing machines from destruction and ensure product purity.
Ferrite separators are characterized by a deep, penetrating magnetic field. They are ideal for catching large pieces of iron (screws, nails, cans, excavator teeth) from a long distance. Neodymium versions are used for precise cleaning of raw material from small particles (food industry, plastics). The decision should be made based on the type of separated material and cleanliness requirements.
The construction is tightly welded from acid-resistant sheet, which guarantees tightness. Thanks to this, the device is waterproof, dustproof, and very durable. It can be safely used in contact with loose food (flour, sugar, grain).
Cleaning a plate separator (static) is done manually. Scrap is removed by mechanically moving it to the edge, where the magnetic field is weaker. To facilitate, a cleaning overlay (dump drawer) can be used, which we offer as an option.
As a manufacturer, we fulfill individual orders for specific conveyor belt widths. Dimensions and mounting system are agreed with the client at the design stage. Send us dimensions of your conveyor belt and type of raw material, and we will select the appropriate solution.

Strengths and weaknesses of neodymium magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

  • They have unchanged lifting capacity, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • Magnets very well protect themselves against demagnetization caused by external fields,
  • By applying a reflective layer of silver, the element presents an elegant look,
  • Magnetic induction on the working part of the magnet turns out to be very high,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise shaping as well as adjusting to individual requirements,
  • Significant place in advanced technology sectors – they find application in data components, electric drive systems, diagnostic systems, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in small systems

Cons of neodymium magnets: tips and applications.

  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making nuts in the magnet and complex forms - preferred is casing - mounting mechanism.
  • Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Optimal lifting capacity of a neodymium magnetwhat affects it?

Holding force of 0 kg is a result of laboratory testing performed under standard conditions:

  • using a base made of low-carbon steel, serving as a ideal flux conductor
  • whose thickness equals approx. 10 mm
  • with an ground contact surface
  • under conditions of no distance (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • at standard ambient temperature

Determinants of practical lifting force of a magnet

Please note that the working load may be lower depending on elements below, starting with the most relevant:

  • Clearance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Chemical composition of the base – mild steel gives the best results. Higher carbon content lower magnetic permeability and holding force.
  • Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a small distance {between} the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets

Serious injuries

Large magnets can crush fingers instantly. Under no circumstances place your hand betwixt two attracting surfaces.

Safe operation

Handle with care. Neodymium magnets act from a distance and snap with huge force, often quicker than you can move away.

Dust explosion hazard

Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Electronic devices

Powerful magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Nickel coating and allergies

Some people experience a contact allergy to nickel, which is the standard coating for NdFeB magnets. Prolonged contact might lead to a rash. We suggest wear safety gloves.

Material brittleness

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

GPS and phone interference

An intense magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Do not bring magnets near a smartphone to prevent breaking the sensors.

Health Danger

For implant holders: Strong magnetic fields affect electronics. Keep at least 30 cm distance or request help to work with the magnets.

Maximum temperature

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will destroy its properties and strength.

Adults only

Absolutely store magnets away from children. Risk of swallowing is high, and the effects of magnets clamping inside the body are very dangerous.

Security!

Details about hazards in the article: Safety of working with magnets.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98