Constant-current contactless magnetizing packing method and apparatus for chain riveting

Abstract

The invention relates to a constant-current type non-contact magnetized nail sorting and packing method and equipment thereof, comprising the steps that: a constant-current type non-contact exciting power supply is adopted to cause nails to be sorted in a constant electromagnetic field; when the sorting of the nails is completed, the current is smoothly attenuated by the power supply to realize the disconnection of a magnetized circuit in the condition of zero current; the method adopts an inverse and reversing switch technique to realize the non-contact switching of the direction of the exciting current to control the whole process of magnetization and demagnetization. The constant-current type non-contact magnetized nail sorting and packing method provided by the invention can constantly protect the magnetized current and the magnetic field from the influences of factors such as the voltage fluctuation of an electric network and the temperature rise of magnetized coils, etc., and can adjust field current by closed loops according to a real field measured value and optimally control the magnetizing effect. The constant-current type magnetized method can further realize the smooth attenuation of the magnetized current to cause the magnetized circuit to be disconnected in the condition of zero current, thus improving the stability and the reliability of the equipment.

Description

technical field [0001] The invention relates to an automatic iron nail packaging method and equipment, in particular to an automatic packaging method and equipment for sorting and packing iron nails with a constant electromagnetic field. Background technique [0002] There are many iron nail manufacturers in our country, and the nail industry has also developed to a certain scale. Nail production is facing the situation of mass production and mass export, and the iron nails need to be packed in the process of export. Iron nails are a large number of scattered parts. It is not as easy to pack as other products. Usually, the nails are staggered and uneven in the packaging box, which makes the box untrue, and it is easy to puncture during the handling process and other quality problems. At this time, if manual packing is used, sorting and packing the nails will not only require a large amount of manual labor, but the packing efficiency is low, and the packing quality is difficu...

AI Technical Summary

Problems solved by technology

The main problem of this method is that it is difficult to accurately control the excitation current value. Factors such as changes in the amount of iron nails in the magnetic core, fluctuations in grid voltage, and temperature rise changes in the magnetic coil can all affect the output current value of the constant-voltage DC excitation power supply. The excitation current and magnetic field strength cannot be kept constant during the magnetization process, which will affect the packaging quality of nail sorting

Secondly, this constant-voltage DC excitation power supply cannot automatically decay the current to zero at the end of magnetization, and can only rely on the contactor to forcibly cut off the circuit, so that the circuit has a large impact, and the contacts of the DC contactor are prone to arcing and burning, and the magnetization circuit Short life and many failures

In addition, when the grid voltage is too high for a long time, it will cause the magnetizing coil to heat and age, affecting its life

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