First, ZM-811 helmet impact resistance puncture tester (mainly to detect the helmet impact absorption performance and puncture performance)
1, drop hammer height: 1000mm.
2, automatically release the impact hammer and puncture hammer.
3, impact hammer material is 45# steel, quality 5-5.01kg;
Puncture hammer hardness HRC45, quality 3-3.05kg.
4, dynamic force sensor: measuring range 0-20KN,
5kHz minimum response frequency, accurate to 1N.
5. One head mold with 1# and 2# aluminum-silicon alloy test heads is attached.
6, LED digital display, automatically save the maximum force value.
Second, ZM-815 helmet chin strap strength lateral stiffness tester (mainly to detect the helmet chin strap strength and lateral rigidity)
1. Measuring force range: 0-750N
2, measuring force accuracy: 1%
3, displacement display accuracy: 0.1mm
4, time display accuracy: 1s.
Third, ZM-816 safety helmet vertical spacing wear height measuring instrument (mainly measuring helmet vertical spacing and wearing height)
1, with two special heads for measurement 2, measurement accuracy: 1mm
Fourth, ZM-817 helmet flame retardant tester (mainly to detect the flame retardant helmet performance)
1. Equipped with highly sensitive combustible gas leakage alarm device, if found combustible gas alarm and automatically cut off gas.
2, time timer: display value error ± 1%, used to record the continued burning time, accurate to 0.01s.
3, the flame application timer: display value error ± 1%, used to set the flame on the helmet on the time, the combustion time can be set, ignition timing range: 0-99.99 seconds.
4, equipped with flame height measurement device: ruler height 50mm.
5, fuel supply device: pressure regulating valve, gas volume control valve, gas tank device, to ensure that the flame-spraying head to discharge a 50mm-length blue flame.
6, the use of electronic ignition, safe and convenient, "push-pull" model rack fixture, "positioning wire" and "guide" assisted positioning.
7, burner automatic timing positioning.
8, ignition time 0-99.9 seconds arbitrarily set, automatically record the duration of ignition, smoldering time.
9. The height of the flame can be adjusted, and the height of the flame that measures the height of the flame can help to set the flame height.
V. ZM-818 helmet anti-static performance tester (mainly detects the anti-static performance of the helmet)
1, high resistance meter indication error: ± 1%,
2. Voltage: 100VDC
Sixth, safety helmet electrical insulation tester (mainly detects the electrical insulation of the helmet)
1, the current value error ± 1%
2, the voltage error ± 1%
3, timer indication error ± 1%
4, probe diameter 4mm, the top is hemispherical.
5. Within 1min, increase the voltage to 1200V ± 25V for 15s.
6. Regulator: Range 1500V
7, high-quality storage tanks.
8, LED digital display current, voltage value.
VII. ZM-820 safety helmet UV aging box (mainly used for aging pre-test before helmet testing)
1, high-quality cold-rolled plate electronic control box, high-quality stainless steel experimental box;
2, using high-precision temperature controller;
3, timing range: 0-999 hours 4, the number of pre-processing helmets: 1-14 top 5, ultraviolet radiation source: high pressure arc arc lamp, 220V, 450W
VIII. High-temperature pretreatment box of ZM-821 hard hat (mainly used for high temperature pre-treatment test before helmet testing)
1, PID self-tuning temperature controller, accurate control of temperature.
2, with a high precision timer and temperature display.
3, all stainless steel fin heating system;
4, high temperature 50 °C ± 2 °C
5, time timing range: 0-99 hours.
Nine, ZM-822 helmet cryogenic constant temperature water immersion pretreatment box (mainly used for low temperature water immersion pretreatment test before helmet testing)
1, water immersion tank temperature: 20 °C ± 2 °C.
2, water immersion tank water way: water pump.
2, low temperature: -20 °C ± 2 °C or -10 °C ± 2 °C optional.
3, time timing range: 0-99 hours.
This article is an article of Qingdao Zhongbang Instrument Co., Ltd. If you need to reprint it, be sure to add the source of the description. Reproduce the misappropriation without permission.
Sintered Ferrite Magnet, hard ferrite, hard ferrite magnet is also called Ceramic Magnets.
Sintered ferrite magnets are available in isotropic magnet and anisotropic magnets. The magnetic properties of isotropic ferrite are low. Since they have nearly the same magnetic properties in all directions, so isotropic ferrite magnets can be magnetized in many different directions or in multi-poles. Anisotropic ferrite magnets have better magnetic properties compare with isotropic ferrite magnets. However this type of magnets can only be magnetized along a preferred direction.
Permanent ferrite magnets are made of hard ferrites, which have a high coercivity and high remanence after magnetization. Iron oxide and barium or strontium carbonate are used in manufacturing of hard ferrite magnets. The high coercivity means the materials are very resistant to becoming demagnetized, an essential characteristic for a permanent magnet. They also have high magnetic permeability. These so-called ceramic magnets are cheap, and are widely used in household products such as refrigerator magnets. The maximum magnetic field B is about 0.35 tesla and the magnetic field strength H is about 30 to 160 kiloampere turns per meter (400 to 2000 oersteds). The density of ferrite magnets is about 5 g/cm3.
The most common hard ferrites are:
Strontium ferrite, SrFe12O19 (SrO·6Fe2O3), used in small electric motors, micro-wave devices, recording media, magneto-optic media, telecommunication and electronic industry.
Barium ferrite, BaFe12O19 (BaO·6Fe2O3), a common material for permanent magnet applications. Barium ferrites are robust ceramics that are generally stable to moisture and corrosion-resistant. They are used in e.g. loudspeaker magnets and as a medium for magnetic recording, e.g. on magnetic stripe cards.
Why choose Ferrite Magnet?
1. Low cost and low price.
The raw material cost is very cheap and manufacturing process is simple. So the price if it is very low.
2. Nice temperature stability
Ferrite magnets can be used in the working temperature from -40℃ to 200℃.
3. Well prevent corrosion
The raw material of sintered ferrite magnet is oxide, so ferrite magnets will not be rusted under severe environment nor affected by many chemicals.
Ferrite Magnet
Ferrite Magnet,Block Ferrite Magnet,Round Ferrite Magnet,Hard Sintered Disc Ferrite Magnet
Jinyu Magnet (Ningbo) Co., Ltd. , https://www.magnetbonwin.com