RU138867U1 - INSTALLATION FOR COATING ON GLASS PRODUCTS - Google Patents

Abstract

Installation for coating glass products, which contains a working chamber and a reservoir with a film-forming solution, interconnected by a solution supply and drain system; lifting device system; a system for controlling the level of the film-forming solution in the working chamber, characterized in that the system for controlling the level of the film-forming solution in the working chamber has a level sensor for the film-forming solution, which includes a low-performance pump, which makes it possible to maintain the level of the film-forming solution during the coating process.

Description

The utility model relates to the manufacture of glass products, in particular to the coating of glass.

A device for coating on glass by dipping products into a film-forming solution [1]. The device comprises a working chamber and a reservoir with a solution of coating material, interconnected by a pipeline system for supplying and draining the solution; a system for creating excess pressure in the tank with the solution, which is made with a level sensor in the working chamber and a time relay; a pressure regulator in the tank with its valve actuator connected to the input of the regulator; a sensor for draining the solution from the working chamber installed in the system for draining and supplying the solution.

Closest to the claimed solution is the installation [2], which contains a working chamber and a reservoir with a film-forming solution, interconnected by a pipeline system for supplying and draining the solution; a system for controlling the level of a film-forming solution in the working chamber by creating the necessary excess pressure in the solution tank, which is made with a level sensor in the working chamber. The installation also contains a system of a lifting device that ensures the stability of the set speed of drawing glass products from solution and the possibility of its regulation in a wide range.

Both solutions have disadvantages. The technical solution for using the device [1] for coating glass does not allow coating to be uniformly applied due to the difficulty of regulating the rate of draining the solution from the working chamber by changing the pressure in the solution tank, since such a system has a significant inertness.

The installation for coating glass [2] compares favorably with the fact that in this case a lifting device system is used to draw products from the solution with the possibility of controlling the speed of drawing. However, in practice, this installation does not exclude the unevenness of the film coating applied to the glass.

The reason for the unevenness of the coating is that when pulling the glass from the film-forming solution, the speed of the meniscus of the solution is added to the speed of drawing by reducing the filling level of the working chamber in a volume corresponding to the volume of the part of the glass that emerged from the solution. However, the additional velocity of the meniscus can be uneven due to imperfections in the shape of the working chamber, such as the convexity of the walls of the chamber, which, in turn, can change with a change in fluid pressure due to a change in the filling level.

The movement of the meniscus in the depth of the working chamber also leads to a change in the conditions of formation of the coating during the application process due to the fact that at the beginning of the process the coating is formed in the atmosphere of ambient air, and further formation occurs with a decrease in the fraction of air and an increase in the number of fumes from the film-forming solution at the meniscus at a certain point in time.

Such manifestations in the process of coating formation lead to the appearance of noticeable horizontal stripes on the product, as well as a gradual, almost uniform, change in the thickness of the coating, which is also its defect.

The basis of the proposed technical solution is the task of obtaining a coating of uniform thickness over the entire surface of the glass, which forms a film-substrate system with specified optical parameters, and hence the expected operational properties of the product.

The problem is solved in that the proposed installation has an additional system of precise control of the level of the film-forming solution in the working chamber. This system is connected to the level sensor of the film-forming solution in the working chamber in parallel with the valve-regulator according to the “either-or” circuit and is activated after the valve-regulator is turned off via a time relay and an auxiliary relay. When the level of the film-forming solution decreases in the working chamber during the drawing of glass, the level sensor of the film-forming solution includes a low-performance pump, which is constantly included in the piping system, which makes it possible to maintain the level of the film-forming solution during the coating process and eliminate the above-mentioned defects.

The technical result from the utility model is that the use of an additional system of precise control of the level of the film-forming solution in the working chamber makes it possible to maintain a constant level of the film-forming solution during coating and to eliminate coating defects, guaranteeing the production of glass products with high-quality performance properties.

In FIG. shows the claimed installation for coating glass products. The installation comprises a working chamber 1, a reservoir 2 with a film-forming solution, a piping system 3 for supplying and draining the solution, a system for setting the level of the film-forming solution in the working chamber by creating the necessary overpressure in the solution tank, a lifting device system that ensures stability of the set speed of drawing products from solution and the possibility of its regulation.

The system for setting the level of the film-forming solution in the working chamber includes a compressed air unit 4, receiver 5, a sensor for filling the level of the film-forming solution in the working chamber 6, a control valve 7.

An additional system for precise control of the level of the film-forming solution in the working chamber is connected to the level sensor 6 in parallel with the valve-regulator 7 according to the "either-or" scheme through an auxiliary relay 16. A low-performance pump 17 is included in the piping system 3, which maintains the level of the film-forming solution during coating .

The system of the lifting device consists of the connected drives of the transport (fast) 8 and the working (slow) 9 movement, the gearbox of the executive drum 11, the electronic control unit 12, the time relay 13 and the limit switch 14. The electronic unit 12 is designed to set the rotation speed of the working drive 9 on principle of negative feedback in the proportional integral differential controller circuit.

The installation works in this way.

They include a transport drive 8, which, rotating the executive drum, immerses the glass in the working chamber 1 not filled with solution, excluding its contact with the walls of the chamber 1. The compressed air unit 4 creates a pressure of 0.5 MPa in the receiver 5. The opening of the control valve 7 in the tank 2 creates an excess pressure of 0.2 MPa, sufficient to displace the film-forming solution into the working chamber 1 through the piping system 3. After reaching a predetermined level of the film-forming solution, the sensor 6 sends a signal to the control valve 7, which closes the supply system compressed air and thus closes it. The time relay 13 is turned on. After a predetermined time delay, it turns on the electronic control unit 12, which supplies the working drive 9 according to the set mode, ensuring the operation of the gearbox 10 and the executive drum 11. Simultaneously with the control unit 12, the time relay 13 turns on the auxiliary relay 16, which switches the level sensor 6 from the control valve 7 to an additional system of precise control of the level of the film-forming solution. From this moment, the level sensor 6 controls the operation of the low-performance pump 17. When the next product is loaded, the time relay 13 is turned on by the limit switch 14. After it is turned off, the auxiliary relay 16 again connects the level sensor 6 to the control valve 7, and the level of the film-forming solution returns to its initial position. The electronic control unit 12 provides a stable predetermined speed of drawing the product from the working chamber with the film-forming solution, the system of precise control of the level of the film-forming solution maintains the level of the film-forming solution in the coating process, which together makes it possible to eliminate the above defects.

The described installation allows to obtain a coating of uniform thickness over the entire surface of the glass and the necessary operational properties of glass products.

Information sources.

1. Patent of Ukraine No. 574 C1, Cl. СО3С 17/25, 1993

2. Patent of Ukraine No. 5734, Cl. CO3C 17/25, 2005

Claims (1)

Installation for coating glass products, which contains a working chamber and a reservoir with a film-forming solution, interconnected by a solution supply and drain system; lifting device system; a system for controlling the level of the film-forming solution in the working chamber, characterized in that the system for controlling the level of the film-forming solution in the working chamber has a level sensor for the film-forming solution, which includes a low-performance pump, which makes it possible to maintain the level of the film-forming solution during the coating process.

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