product news/產品新聞
Shown is the magnetic separator/windsifter of a shot blasting machine in a foundry.
所示为工厂中抛丸机的磁 选机和风筛。
unit, the magnetic separator, is connected upstream from the usual cascade windsifter. Te magnetic separator is respon- sible for removing the aggressive small foundry sand from the abrasive circulation. Te abrasive, roughly cleaned by the sieving conveyor, is conveyed to the hopper above the blast- ing chamber by the bucket elevator. Te magnetic abrasive is removed from the abrasive-sand mixture as it passes through one or two magnetic cylinders. Afterward, it passes the wind- sifter and is fed back to the turbines, completing the cycle. Te sand is discharged from the machine. In some cases it can be re-used. In other cases, it is discarded. Te basic principle of the shot blasting unit is the same
for almost all manufacturers of blasting wheel-type ma- chines, but the machines have some differences in design. Various adjustment possibilities are important. Te abrasive in a shot blasting machine runs over an edge
as a continuous, thin and preferably wide abrasive veil. Te air draught of the filter fan’s negative pressure extracts the fines. Various adjusting flaps enable an optimal setting. With some experience, a maintenance person can set the machine to the proper mixture and reduce wear to the machine.
装置安装在破碎室下面。一个额外的磁选机逆向安装在 级联风筛上，以净化磨料。磁选机负责将循环磨料中有 害的和破裂后有害的型砂分离出去。经过初步过滤的磨 料通过斗式提升机运送到破碎室上面的料斗中。当磨料 经过磁筒时，磁性的磨料从磨料与型砂的混合物中分离 出去。然后，通过风筛返回涡轮机，完成循环。型砂从 机器中卸出，有时可以重新利用，或者被丢弃。 对于所有的转子抛丸机厂商来说，抛丸部分的基本原 则几乎一样，但是机器设计上有所不同。各种可调性非 常重要。
磨料在一个连续的、最好宽一些的覆盖面边缘上运 行。过滤风扇负压产生的气流将细微颗粒吸走。不同的 可调襟翼使得理想的设置成为可能。有经验的维护人员 可以合理设置机器，降低磨损。
The cylinders and abrasive veil can be seen in this opened magnetic separator/ windsifter.
在打开的磁选机和风筛中， 可以看到圆柱和磨料覆盖 。
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION Winter 2012
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