Method for automatically dismounting electronic device on abandoned printed circuit board by using industrial waste gas

Abstract

The invention discloses a method for automatically dismounting an electronic device on an abandoned printed circuit board by using industrial waste gas. The method sequentially comprises the following steps that: the temperature of industrial waste gas after the dust removal purification is controlled at 223 to 233 DEG C through a precise temperature controller; 70 percent to 90 percent of industrial waste gas passing through the precise temperature controller is directly introduced into a high-temperature pulse dismounting chamber, then, the industrial waste gas flows into a pre-heating chamber in a direction opposite to the operation direction of the abandoned printed circuit board, the abandoned printed circuit board is subjected to pre-heating and high-temperature heating, and welding fluxes are smelted through the gradual heating of the abandoned printed circuit board through the pre-heating chamber and the high-temperature pulse dismounting chamber; and the rest 10 percent to 30 percent of smoke gas is introduced into the high-temperature pulse dismounting chamber through a pulse gas source control assembly for realizing the pulse blowing and spraying on the abandoned printed circuit board. The goal of changing the industrial waste gas and the abandoned printed circuit board into resources is realized, in addition, the heat pollution of the industrial waste gas is reduced, and the coordinated development among the man, the nature, the environment and the economy is really realized.

Description

technical field [0001] The invention relates to a method for automatically disassembling and recycling electronic components on a waste printed circuit board, and belongs to the technical field of comprehensive utilization of electronic waste resources. Background technique [0002] Printed circuit boards are an integral part of electronic products, and their output value is increasing day by day. According to relevant report statistics, in 2007, the output value of printed circuit boards worldwide reached 49.9 billion US dollars, with an annual growth rate of about 4.6%. In 2007, the output value of printed circuit boards in mainland China reached 14.3 billion US dollars, with an annual growth rate of 18.2%. Mainland China has become the fastest growing region in the world for printed circuit board output. A large amount of production will inevitably bring a lot of waste. However, waste printed circuit boards have their special identity. On the one hand, waste printed cir...

AI Technical Summary

Problems solved by technology

The high-temperature and high-pressure gas (air or nitrogen) used in this method is expensive to produce, and is not suitable for large-scale industrial production; to realize the disassembly of electronic components by mechanical flipping and vibration, each circuit board must be fixed, increasing the cost. It increases the difficulty of the processing process and is not suitable for large-scale industrial production

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