Automatic spray coating method and device

Abstract

The invention relates to the technical field of spray coating and discloses an automatic spray coating method, which comprises the steps that: a product to be spray-coated is placed on a main track for running, a first detection element detects the position of the product to be spray-coated on the main track and controls a spray gun to slide on a sliding rail and to spray-coat the product to be spray-coated, a second detection element detects the product to be spray-coated by scanning and feeds back the information, detected by scanning, to a control valve, and the control valve controls the opening / closing of a conveying pipe according to the received information so that the spray gun performs selective spray coating on the product to be spray-coated, wherein the second detection elementis connected to the spray gun and the control valve is arranged in the conveying pipe for conveying spray to the spray gun. Compared with the prior art, the method and the device of the invention canperform selective spray coating on the product to be spray-coated without the situation that the production and the quality of the product to be spray-coated is impacted by spray coating, furthermore, the device has a simple structure and the cost is low.

Description

technical field [0001] The invention relates to the technical field of spraying, in particular to an automatic spraying method and device. Background technique [0002] In the assembly process of electronic components on the circuit board, the electronic components are welded on the copper foil of the circuit board by soldering tin. At present, the automatic wave soldering machine is generally used to weld the circuit board to ensure the continuity of the circuit on the circuit board. Before welding , the automatic spraying device in the automatic wave soldering machine needs to spray flux on the circuit board. [0003] Such as figure 1 As shown, the automatic spraying device 1 in the prior art includes a main rail 11 ", a slide rail 12 " and a spray gun 13 ", the circuit board 2 " moves on the main rail 11 ", and the spray gun 13 " is used to give the circuit board 2 " The lower end surface of the automatic spraying device 1" also has a detection electric eye, and the det...

AI Technical Summary

Problems solved by technology

[0004] The above spraying process will not affect the production or quality of some whole circuit boards, but for some spliced ​​circuit boards or circuit boards with gaps, since the spray gun is always under the circuit board Spray the flux upward, so that some flux will be sprayed on the electronic components on the upper surface of the circuit board through the gap of the circuit board, which will seriously affect the production or quality of the circuit board, resulting in poor contact of the circuit board and signal interference. , or even short circuit, etc., especially some precision electronic components, which have a greater impact

[0005] At present, in response to the above problems, generally only the jig can be used to block the gaps of the circuit board or use high-temperature stickers to paste the gaps of the circuit board, so as to avoid the flux when the spray gun sprays the flux on the lower surface of the circuit board. Does not spray directly onto the electronic components on the top face of the circuit board, however, this is complex and costly

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