SU596291A1 - Airless paint-spraying apparatus - Google Patents

Description

The invention relates to a technique for painting surfaces by airless sprayed and mainly railway rolling stock.

Known installation for painting surfaces by airless spraying. including a spray gun and series-connected na.osos.dl paint supply with drive cylinders, equipped with pressure regulators and distribution devices. In order to maintain a given ink pressure at the moments when the working ciping pistons are in the dead points of the plungers, the installation is equipped with a hydraulic accumulator connected to the spray gun parallel to the circulation pump lj.

The disadvantage of this installation is the presence of an additional device in the form of a hydroaccumulator.

Closer to the proposed paintless airless sprayer containing a sprayer, parallel to the paint supply unit connected to JUIM, led by pei-pressure devices; n1 and switchgear 2. The undersupply of this unit in

It is possible that it cannot maintain a constant predetermined paint pressure, since when the cylinder is located and, consequently, the pump plungers associated with them are in extreme positions, the paint pressure is set and it is not applied to the surface to be painted. This is because the plungers are driven from a single piston.

The circuit of the invention is the regulation and maintenance of a constant ink pressure.

This goal is achieved due to the fact that the drive is made in the form of individual dual power cylinders equipped with travel speed controllers. Due to the presence of individual cylinders with speed controllers, the pumps are found in different phases, which ensures the constancy of paint pressure in the spray gun and uniform (without interruption) paint supply to the surface to be painted.

The drawing shows the installation diagram.

The installation contains a spray gun 1, a pump 2 and 3 connected to it with a drive in the form of individual hydraulic scoops 4 and 5, respectively, a pump 6 for supplying a working fluid with a front valve 7 and stroke controllers 8 and 9, pressure regulators 10 and 11, distributors with electric control 12. and 13, limit switches 14 and 15 and the tank 16 with paint.

The installation works as follows. Both feed pumps 2 and 3 are lowered. in the tank 16 with paint. The working fluid is pumped to pump speed regulators 8 and 9 by pump 6 and then directly into rod cavities of driving cylinders 4 and 5 and through distributors, with electromagnets switched on, into piston cavities of hydraulic cylinders 4 and 5. Hydraulic cylinders 4 and 5 are used uniform pump speeds up and down. Pumps reciprocate and supply paint to the sprayer. With the help of regulators 8 and 9, the pumps are regulated so that when the piston of one of the pumps is in the dead center, the piston of the other pump is in the center / vice versa position. The pressure control of the paint generated by each of the pumps is made by pressure regulators 10 and 11 of the working fluid.

Turning on and off electroctagnto. distributors 12 and 13 os. ustp by means of traveling switches 14 and 15 at the approach of the pistons of the drive hydrocindors | o1} dead spots.

The proposed installation has unbearable dimensions, is easy to operate and provides high quality coatings.

Formula ibtye

An airless paint spraying unit containing a spray gun, paraffinally coupled pumps for supplying paint, a drive, pressure regulators and distribution devices, is designed so that, in order to control and maintain a constant paint pressure, the drive is designed as individual power cylinders equipped with speed controllers.

Sources of information taken into account in the examination:

1. USSR author's certificate number 15724O, cl. B OB B 7 / O2, 1962.

2.Labutin, R.A., et al. Apparatus and devices for applying and testing paint coatings. M., Himi, 1973, p. 89-95.

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