RU1812017C - Method for applying liquid to surface of article - Google Patents

Abstract

Usage: in the field of applying small doses of liquid fluxes, hot pastes, protective coatings and other liquids on the surface of products in the electronic, electrical and radio engineering industries. SUBSTANCE: dosing rod is immersed in a container with liquid to a predetermined depth and raised at a speed higher than the rate of liquid draining from the rod. The rod with the collected dose of liquid is transferred, lowered and wetted with liquid. Then they lift it with a speed less than the speed of liquid draining from the rod. As a result, the entire microdose of liquid taken from the container of a certain stable volume moves from the dosing rod to the place of liquid application.

Description

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The invention relates to methods for applying liquid to the surface of products by contacting a dampened rod dampened with liquid with the product and can be used to apply small doses of liquid fluxes, hot pastes, as well as protective and other coatings on the surface of products in electronic, engineering, instrument-making, electro and the radio engineering industry, in particular the radio industry, for applying hot paste to the terminals of pulse and microtransformers.

The aim of the invention is to improve the quality of the application of small doses of viscous liquid to the surface of the product.

This is achieved by the fact that in the method of applying liquid to the surface of the product,

which consists in immersing the dosing rod in the liquid container to a specified depth, lifting the rod with a dose of liquid, transferring and lowering the rod until it contacts the place where the liquid was applied, wetting the surface of the product with liquid, lifting the rod from the contact surface, lifting the rod out of the liquid container the speed is greater than the rate of liquid draining from the rod, and the rod is lifted from the place of application of the liquid at a speed lower than the rate of liquid draining from the rod.

Due to the fact that the rod is lifted from the container with liquid after immersion to the set depth at a slope. more than the rate of runoff of fluid

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from the rod, the liquid removed from the vessel by the rod and held thereon by adhesion, not having time to drain, remains on the rod in a certain predetermined volume.

Due to the fact that after the liquid is wetted by the place of its application, the rod is lifted at a speed less than the rate of liquid draining from the rod, it is possible to remove the entire dose of liquid from the rod in full by simultaneously using the force of the dose weight and the adhesion force of the liquid with respect to its place application.

In order to implement the method, the rate of liquid dripping from the dosing rod is preliminarily determined. For this, the rod is immersed in the liquid to a certain depth, removed from the liquid, applied to the liquid located on the removed rod, the dye is dyed, and the time of movement of the label is measured the core in a layer of flowing liquid. Using the time and the distance traveled by the mark, the rate of flow of fluid from the rod is calculated. Then, the dosing rod is again immersed in a container with liquid, kept in it until the concave meniscus formed around the rod is aligned, and then it is removed from the container at a speed greater than or equal to or less than the rate of liquid draining from the rod.

When the dosing rod was removed from the container with a speed greater than the rate of liquid draining from the rod, the liquid dose taken by the rod had a certain stable volume, and when the rod was removed with a speed equal to or less than the rate of liquid draining from the rod, the volumes carried by the liquid rod at each immersion of the rod were unstable and varied several times (depending on the forces of molecular adhesion of the tolerated dose to the rod and, with the remaining volume of liquid, as well as on the speed of extraction of the rod and liquid spine.;

In the process of applying a dose of liquid, the rod was also raised from the place of its application at different speeds: more, equal to or less than the rate of liquid draining from the rod.

At the rate of rise of the rods from the place of application of the fluid, greater than or equal to the rate of liquid draining from the rod, part of the fluid, especially viscous, did not have time to flow, and remained on the rod. As a result, the doses of liquid applied by the rod were not the same and differed in volume.

When the rate of rise of the rod from the place of application of the liquid was less than the rate of runoff, the entire dose of liquid taken by the rod passed to the place of application of the liquid, and the volumes of liquid applied by the rod were the same.

PRI me R. 8 containers with constant stirring are tin novosvinovsista on flax paste POS-61. Four

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steel dosing rod x reinforced

in a common holder at the same horizontal level. The working end of each metering rod has a cylindrical shape with a diameter of 0.8 mm and a slit width

5 0.3 m and a length of 1 mm.

“Before applying the hot paste to the place of soldering, the runoff speed was determined. pa of pasta with a rod. To do this, the metering rods mounted in the holder

0 was lowered into a container with pale paste to a depth of 2 mm, held for 1.5-2 s until the concave menisci of the paste surface were aligned around the rods, lifted from the container and put a dye mark on

5 paste removed from the container by the rod. Then, using the sighting optical tube and stopwatch, the path and time of movement of the mark along the bar were determined. After that, the calculation determined the rate of runoff of the hot paste from the rod, equal to 0.3 mm / s. Extraction of the dosing rods from the tank was carried out at different speeds: more, equal to and less than the runoff speed of 0.3 mm / s;

5 rod pastes were controlled using a sighting optical tube. At a rod extraction speed of less than 0.3 mm / s from the container, the volumes of paste carried out by different rods were significantly different or completely absent. At a speed of removing the rods from the container greater than 0.3 mm / s, the paste volumes carried by all the rods were equal and stably held on the rods.

5 In order to apply small doses of hot paste to the soldering sites, the rate of extraction of the dosing rods from the container was chosen taking into account that during transfer and subsequent lowering of the rods with doses taken from the container, the hot paste did not have time to separate from the rods by its own weight. This speed was 20-30 mm / s. At such a rate of extraction of dose rods

5 pale pasta were stable and equal.

After lowering the metering rods to the solder points and wetting the solder spots with the paste, the metering rods were lifted at different speeds. When the rod lifting speed of more than or equal to 0.3 mm / s, only a part of the selected dose passed to the soldering sites, while the volumes of paste left by different rods varied significantly, which caused rejects. The remaining parts of the doses remained on the rods. At a speed of lifting the rods from the soldering sites less than 0.3 mm / s, all collected doses steadily passed from the rods to the soldering places in full.

Thus, to solder the terminals of transformers with TYUS-61 hot paste, the speed of lifting rods from the tank with hot paste equal to 20-30 mm / s and the speed of lifting rods from soldering points of 0.2 mm / s were automatically selected. which, respectively, is more and less than the speed of paste flow from the rod. At these speeds, high quality soldering was achieved.

The invention improves the quality of the application of limited small doses

Claims (1)

liquids, eliminate the need for constant visual control, ensure a high-quality process in automatic re-. bench press line. The claims The method of applying liquid to the surface of the product, including immersing the dosing rod in a container with liquid, lifting the rod with a dose of liquid, transferring 0 and lowering the rod to contact with the place of application of the liquid, wetting the surface of the product with liquid, raising the rod from the contact surface, characterized in that, for the purpose of 5 to improve the quality of applying small doses of viscous liquid to the surface of the product, the rod is lifted from the liquid container at a speed greater than the rate of liquid draining from the rod, and 0 rod from the place of application of the fluid is produced at a rate of lower velocity of liquid draining from the rod.