Method and equipment for disassembling circuit board using non-contacted impact

Abstract

The invention relates to one method and device to process disable by contact impact on circuit board, which comprises the following steps: adopting u shape tank structure or card tank structure spring fix device circuit board; heating circuit board; through point or bar or plane impact structure to exert non-contact impact on circuit board; scripting, isolating, collection elements and welding; after cooling sorting the circuit board and elements. The invention device comprises the following parts: impact lever, point or bar or plane impact structure, compression spring, circuit board spring fix device, blower device and spring network.

Description

technical field [0001] The method and equipment for dismantling circuit boards by using non-contact impact, which relate to the method and realization device for the integral and non-destructive disassembly (or removal) of components from printed circuit boards based on function recovery, belonging to production and maintenance and waste recycling technologies. Background technique [0002] A printed circuit board (Printed Curcuit Board, referred to as PCB, or Printed Wiring Board, referred to as PWB) is an important part of electronic information products, household appliances, etc. my country is a major producer of circuit boards in the world, and tens of thousands of tons of waste circuit boards are produced in the production process every year; with the continuous upgrading of electronic and electrical products, a large number of electronic and electrical products have been eliminated, and printed circuit boards have also been abandoned. Due to the lack of proper recycl...

AI Technical Summary

Problems solved by technology

Its disadvantages are: due to its material characteristics (the base material is mainly made of epoxy resin, glass fiber, etc. through composite methods), it becomes soft at the melting temperature of the solder, and cannot provide a uniform response to all parts of the circuit board. Elasticity; and in order to obtain sufficient resilience, the impactor bracket must push the circuit board very high, which cannot be effectively disassembled for longer plug-in components

Its disadvantages are: because the circuit board cannot be well sealed when it is installed in the device, and there are many through holes such as mounting holes and pin jacks on the substrate itself, hot air is constantly blown into the surface of the circuit board. Under normal circumstances, the lower surface of the circuit board is not easy to generate a large negative pressure, so the removal effect of the plug-in components is not good

The disadvantage is that the circuit board needs to be clamped by the clamping device to turn it over, but generally there is not enough space on the circuit board for clamping, so it is necessary to remove more components in advance, making the preparation for disassembly time-consuming and laborious. Or it needs to occupy the clamping space and damage some components; moreover, because the circuit board has softened at high temperature, the impact is implemented by rotating the impact parts, the impact force is small, and the disassembly effect on components is not good.

Its disadvantages are: the plug-in components cannot be disassembled; due to the limited heating area of ​​the strip nozzle, if the area of ​​the patch components is large, the disassembly effect will be affected; the flux that falls last will stick to the components that fell first, making Components and flux are not separated

However, using the vibration method, although larger SMD components can be disassembled, for some SMD components with small mass and volume, the disassembly effect is not good because the disassembly energy is not large enough.

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