A programmable sprayer and its control method

Abstract

The invention discloses a programmable sprayer and a control method thereof. The sprayer comprises a spray gun, an X-Y axle conveying mechanism, a driving motor, a rodless cylinder, a photoelectric sensor, a programmable controller, a spray width display, a guide rail type mounting bracket, a flow meter, a touch screen and a circuit board bonding pad; the X-Y axle conveying mechanism adopts a ball screw spiral driving mechanism; a precise rotating rail is arranged on a polished shaft; a ball bearing sleeve is used for coating the precision rotating rail, and performs a linear motion proportional to the rotation of the polished shaft; a rotating shaft encoder is adopted to calculate a rotating number of a lead screw; the rotating number is returned to a comparator to determine precise position of the spray gun; a positioning column is arranged on the circuit board bonding pad; a circuit board to be welded is provided with a positioning hole in the corresponding position; and when the circuit board to be welded is fixed on the circuit board bonding pad, the positioning column on the circuit board bonding pad is inserted in the positioning hole in the circuit board, so that the positioning error of the circuit board is kept within +-0.1 mm.

Description

technical field [0001] The invention relates to a programmable sprayer and a control method thereof, belonging to the technical field of circuit board auxiliary processing. Background technique [0002] A sprayer is a mechanical device that sprays flux during the circuit board soldering process. Flux can purify the surface of welding metal and solder during the welding process, help welding, keep the molten solder and the surface of the metal to be welded clean, and ensure that the solder wets and forms an alloy on the surface of the metal to be welded. Except for pure gold and platinum in nature, almost all metals will be oxidized when exposed to air at room temperature, and the oxide layer formed on the surface will hinder the welding process. Flux can effectively remove oxides on the soldering surface and play a role in soldering. Further studies have shown that flux can not only remove oxides on the surface of the metal to be welded, but also promote heat transfer from...

AI Technical Summary

Problems solved by technology

The sprayers in the prior art have certain limitations in practical application, either the positioning accuracy is not enough, or the spraying speed will become lower due to the improvement of positioning accuracy, and a good balance has not been achieved between positioning accuracy and spraying speed. Cause unnecessary functional or economic loss

In addition, the sprayer in the prior art usually sprays the entire board according to the length and width of the circuit board, which causes the flux to be sprayed on the positions that do not need to be sprayed, which wastes the flux and makes it difficult to clean the circuit board later.

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