A vibrating feeding device and automatic feeding system for NdFeB powder

Abstract

The invention discloses a neodymium iron boron powder vibrating feeding device and an automatic feeding system. The neodymium iron boron powder vibrating feeding device comprises a vibrating disc, a vibrating base, an electric controller, a discharge rail and a height limiting mechanism, wherein the vibrating disc is fixedly arranged on the vibrating base; the electric controller is connected with the vibrating base; the electric controller outputs voltage to control and regulate vibration amplitude of the vibrating base; a feeding rail which spirally ascends is arranged on the inner wall of the vibrating disc; an outlet of the feeding rail is connected with an inlet of the discharge rail; and the height limiting mechanism is arranged above the inlet of the discharge rail. The neodymium iron boron powder vibrating feeding device has the advantages of reducing powder agglomeration and caking, being more sensitive in voltage regulation, and guaranteeing uniformity of neodymium iron boron powder conveying; and the automatic feeding system is constructed based on the neodymium iron boron powder vibrating feeding device, and voltage is regulated to precisely control vibration amplitude and powder unloading speed of the vibrating disc according to real-time judgment of powder unloading weight and weighing time of a weighing system, so that overhead retention volume is improved, automatic, quick and precise feeding is realized, and piece weight and dimension consistency of a neodymium iron boron green body are improved.

Description

technical field [0001] The invention relates to a vibrating feeding device for NdFeB powder, in particular to a vibrating feeding device for NdFeB powder and an automatic feeding system. Background technique [0002] In recent years, the sintered NdFeB permanent magnet industry has developed rapidly, and its production technology has also developed by leaps and bounds. In the production of sintered NdFeB magnets, the pressing process is the most critical part. Because the average particle size of NdFeB powder (that is, NdFeB alloy powder) is very small, usually only about 3 μm, and the particle size distribution is narrow and sharp, resulting in poor fluidity of NdFeB powder, easy to agglomerate, and it is difficult to powder The material is evenly filled into the cavity of the molding press in the compression molding process. The uneven filling density of NdFeB powder in the mold cavity will lead to large deviation of single weight of NdFeB green body obtained by pressing...

AI Technical Summary

Problems solved by technology

The amplitude of the linear vibrator is greatly affected by the quality of the NdFeB powder on the linear track. As the NdFeB powder is discharged on the linear track, the quality of the powder decreases, and the falling speed of the powder increases first and then decreases. The change of the powder feeding speed leads to a large change in the amount of air retention; in addition, the NdFeB powder on the linear track will inevitably agglomerate and agglomerate, and the existence of lumps will directly lead to the uncontrollable amount of air retention. The consistency is poor, and there is a large error between the preset value (Chinese invention patent 201110411479.4)

Long-term accumulated errors lead to too much or too little NdFeB powder in the feeding shoe, which will eventually affect the density of NdFeB powder filled into the mold cavity, resulting in a large deviation in the single weight of the NdFeB green body obtained by pressing. Consistency is not high

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