Large-scale magnetic suspension detection method and device based on magnet arrays
A technology of a magnet array and a detection method, which is applied to measurement devices, specific gravity measurement, instruments, etc., can solve the problems of cumbersome preparation process of large-size magnets, blocking the development of magnetic levitation detection technology, expensive and dangerous, etc., and achieves a wide range of detectable densities, Simple structure and high detection accuracy
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Embodiment 1
[0062] use figure 1 The device shown is used to measure the density of a polymer with unknown density. The experiment selects a 2M (mol / L) manganese chloride aqueous solution, and the density ρ m 1.196g / cm 3 , magnetic susceptibility χ m is 3.63×10 -4 .
[0063] Eight NdFeB permanent magnets are used to form a set of magnet arrays. The size of each small magnet is 40mm*40mm*20mm. Two sets of magnet arrays are spliced together. The distance between the two sets of magnet arrays is 40mm.
[0064] 1. Density detection of small-sized substances
[0065] The same batch of PLA pellets was selected, with a maximum size of about 5 mm. Use alcohol to clean its surface, place it in the MnCl that has been configured to hold 2M (mol / L) 2 In the transparent container of the aqueous solution, after the suspension is stable, use the camera to suspend the height and measure it. Using other PLA pellets from the same batch, the experiment was repeated 5 times, and the suspension height...
Embodiment 2
[0077] Such as figure 1 As shown, a large-scale magnetic levitation detection device based on a magnet array includes two groups of magnet arrays 4 with opposite poles that are arranged up and down, an outer frame 1 that constrains the magnet array 4, and a transparent container that a paramagnetic medium is housed (in the figure not shown).
[0078] The two magnet arrays 4 are coaxially arranged, and the gravitational fields are aligned up and down. Each group of magnet arrays 4 is composed of eight square magnets, and is detachably installed on the outer frame 1 by the iron plate 5 and the receiver 3 working together. The transparent container is placed between two sets of magnet arrays 4 . A camera is also provided at the corresponding position of the transparent container to record the suspension height of the detected substance. The camera is set separately, just adjust the proper recording position during work.
[0079] During installation, first magnetize the magnet...
Embodiment 3
[0082] A large-scale magnetic levitation detection device based on a magnet array, including two sets of magnet arrays 9 with opposite poles arranged up and down, a transparent container (not shown in the figure) between the two magnet arrays 9 and a paramagnetic medium is housed ), respectively fix the upper iron plate 11 and the lower iron plate 12 of the upper and lower two corresponding magnet arrays 9, the top plate 7 above the upper iron plate 11, the adjusting screw threaded with the top plate 7 and the lower end fixedly connected with the upper iron plate 11 6.
[0083] The top plate 7 is fixedly connected with the lower iron plate 12 through the guide rods 8 arranged at its four corners, and the upper iron plate 11 is slidably connected with the four guide rods 8 respectively. During installation, fix the magnetized magnets on the corresponding iron plates (upper iron plate 11 or lower iron plate 12) with screws to form a magnet array 9. This embodiment adopts a singl...
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