The permanent magnet drum magnetic separator has a high frequency of use in
quartz sand iron removal ring joints, and frequent replacement due to wear of
the drum skin is a concern for many production lines. Quartz sand has high
hardness and sharp edges, and the cylinder skin rubs against it for a long time,
resulting in a much faster wear rate than processing other minerals. Every time
the casing is replaced, the magnetic system needs to be disassembled and
recalibrated, which is time-consuming, labor-intensive, and affects
production.
The insufficient hardness of the shell material is the primary reason for
rapid wear and tear. The hardness of ordinary 304 stainless steel cylinder skin
is only about HRC20, and groove like abrasion marks will quickly appear under
continuous erosion of quartz sand, and the magnetic penetration effect will also
decrease accordingly. It is recommended to use wear-resistant stainless steel
(such as 2Cr13 quenched and tempered treatment) with a hardness of HRC30 or
above, or directly weld a wear-resistant layer on the surface of the cylinder.
The ceramic coated rollers provided by some manufacturers are also worth
considering, as their wear resistance can be improved several times. To
determine whether the cylinder skin needs to be replaced, you can use a caliper
to measure the thickness of the cylinder skin when the machine is stopped - when
the wear is close to one-third of the original thickness, it should be arranged
to be replaced, don't wait until it is worn through before dealing with it.
Sealing failure leading to slurry infiltration can also accelerate internal
damage. After the aging or wear of the sealing rings at both ends of the
cylinder, the slurry seeps into the interior of the cylinder, which not only
corrodes the magnetic yoke and magnetic block fixing parts, but also causes the
magnetic block to demagnetize due to moisture. The sealing ring should be
inspected quarterly and replaced immediately if hardening or cracking is found.
When installing a new cylinder cover, it is necessary to ensure that the cover
is clean and free of scratches, and apply an appropriate amount of sealant.
After installation, calibrate with a level to ensure that the drum is parallel
to the material trough and the deviation is controlled within 1mm.
If abnormal grooves or periodic impact sounds are found on the surface of the
drum during daily inspections, it is likely that the drum skin has been severely
worn and the internal magnetic block may have become loose. Immediate shutdown
and comprehensive inspection are required. Shanlu Heavy Industry has accumulated
rich experience in the field of quartz sand magnetic separation equipment, and
can recommend suitable cylinder skin materials and maintenance cycles based on
material characteristics. For equipment operation related issues, please feel
free to contact the technical team of Shandong Heavy Industry for communication
and exchange: Manager Zhang 13583776655 (same as WeChat).