JPS61133129A - Viscosity regulator for liquid, particularly, paint used formanufacturing mirror - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

BACKGROUND OF THE INVENTION This invention relates to a viscosity control device for liquids, particularly paints used in the manufacture of mirrors.

Particularly, but not exclusively, in this field of mirror production, one side of the glass plate is first coated with a layer of silver, then with a layer of copper and finally with a layer of protective paint. This protective paint layer is dried in an oven. On the contrary, if the viscosity of the paint is too high, the consumption will be high and therefore the drying process will take longer and therefore the power consumption required for drying will increase.

If the viscosity of the paint is too low, the paint coating will be inadequate and too much diluent will be consumed.

[Summary of the invention]

The main aim of the invention is to eliminate the disadvantages caused by excessive viscosity of liquids, especially paints.

The purpose is to pass the liquid to be prepared into a container containing an impeller driven by an electric motor, and to measure and compare the energy consumption of the electric motor as a function of the resistance provided by this impeller using a measuring mechanism. Achieved by the device according to the invention, characterized in that the viscosity of the liquid is adjusted by comparing it with at least one threshold value of the mechanism and using it to control the output of the comparison mechanism by at least one value. Ru.

The device according to the invention is suitable for arming liquids of high or low viscosity. The energy consumption of the electric motor is compared with two threshold values: a value representing the maximum permissible viscosity value and an E representing the minimum permissible viscosity value. If the energy consumed exceeds the maximum permissible viscosity value, a valve is opened and diluent is added to the too viscous liquid. The energy consumed is less than a threshold representing the minimum permissible viscosity value.

A liquid with a higher viscosity is added to a liquid with a lower viscosity.

The invention will be further elucidated by the detailed description of preferred embodiments, shown by way of non-limiting example in the accompanying drawings.

[Detailed description of preferred embodiments]

In the accompanying drawings, reference numerals 1 and 2 designate a tank containing paint used in the manufacture of mirrors, the viscosity of which is unsuitable for use, and a tank containing a paint diluent. Reference numeral 3 indicates a container for mixing paint and a solvent to reduce the original viscosity of the paint. The paint is
From the tank l it is transferred by gravity into the container 3 via a pipe 4 and a solenoid valve 5 in this embodiment. Diluent is also transferred via the vibro and TL solenoid valves. These two solenoid valves 1 can be connected, for example, by the operator by actuating switches 8, 9 or by means of a control circuit (
(described later).

The mixing vessel 3 contains a known agitator Ia12, for example in the form of a rotating blade or arm, which mixes the paint and the solvent and keeps them in motion. The stirrer is driven by a geared electric motor 13 held in a cover 14 through which a pipe 4.6 passes.

In this embodiment, the cover supports the container 15, which has a hole 16 with a small cross section in the corner. This hole opens into the mixing vessel 3 above the maximum position H reached by paint and diluent in the mixing vessel. 1M in the container,
A blade l1t17 driven by a motive 18 is provided. In this embodiment, the impeller is provided with a series of blades in a radial direction.

The electric motor 41!18 is supported by a removable cover 19 of the container. A pipe 20 that opens into the container is connected to this cover, and the other end of the pipe branches off from a conveying pipe 21 of an electric pump 22. The conveying pipe 21 communicates from the bottom of the container 3 to a location where the paint drawn out via the suction port and the suction pipe 24 is used. Electric motor 1
An ammeter 26 is connected to the power supply line 25 to 8 to measure the current consumed by the motor and generate a corresponding signal.

This signal is sent to the comparator circuits 30, 31 of 2(11). In the comparator circuits, the user can set different predetermined threshold values for each comparator circuit. The output of the comparator circuit 30 The output of the comparator circuit 31 controls the solenoid valve 7 via the connection 10.These two connections include a known amplification mechanism, a control mechanism, or both. Of course, it is also possible to provide a comparator circuit and control these solenoid valves by the output signal from the comparator circuit.By the output of the comparator circuit 30, 31,
Turn on lamps 71 and 72.

The operation of the device according to the invention is as follows.

After removing the cover 14, the operator, for example.

Assume that three parts of a commercially available thick paint and one part of a diluent are placed in container 3 to roughly obtain the viscosity required for use.

Furthermore, it is assumed that these paints and diluents are located slightly below the position indicated by symbol H. Assuming that the pipes 4 and 6 are of suitable size, the cover 1 can be opened by simultaneously actuating the switch 8.9 and opening the solenoid valve 5.7.
Liquid can be supplied at a nearly sufficient rate without removing 4. I have heard that a level sensor 50 provided in the container 3 closes these solenoid valves.

Next, start the agitation fi12 and start the conveyor pipe. Close the valve 40 connected to (2) and start the electric pump 22. Thus, the container 15 becomes full because less liquid exits from the outlet (hole) 16 than enters from the pipe 20. When the container 15 fills in this manner in a short period of time, the level sensor 60 activates a timer circuit (not shown) to start the motor 18 of the impeller 17 after a predetermined period of time.

Since the rotation of the impeller is impeded by a resistive torque that depends on the viscosity of the paint, the current consumed by the motor 18 is a function of this torque and thus the viscosity of the paint.

Each threshold value indicating a permissible range of viscosity of paint supplied to one or more paint application locations has already been set in the comparison circuit.

This setting is a potentiometric (
Potent iomentricaLly) may also be performed.

Depending on the power consumption by the electric motor 18, the following conditions may occur.

a) The current consumption and therefore the viscosity of the paint are at the threshold thickness imbalance. If after a while after starting the electric motor 18 (the electric motor
The start of machine J can be determined by the lighting of the lamp 70 connected in parallel with this).If one of the two lamps 71 and 72 is not lit to indicate that there is an abnormality in viscosity, the operator should: Valve 40 can be opened to supply paint to one or more points of use.

b) If the viscosity is too high, a signal is output from the comparator circuit 31, so the lamp 72 lights up.

The solenoid valve 7 opens and automatically flows the diluent into the container 3, the viscosity and current consumption decreasing until these are within acceptable limits. Once the lamp 72 is extinguished, the operator can open the valve 40 to dispense paint to multiple use points.

C) If the viscosity is too low, operate the comparator circuit 30 and the solenoid valve 5 in the same way to supply a thicker paint from the tank 1 to the container 3 until the desired condition is reached as indicated by the extinguishing of the lamp 71. do. In this way, one operator can open the valve 40.

During production interruptions, and even during production, the paint can thicken due to unavoidable evaporation.

If this occurs, the addition of diluent is adjusted by measuring the current draw of the motor 18 to achieve the desired viscosity of the paint, as described above.

The electric pump 22 is connected to a pipe 80 equipped with a pressure relief valve and returns the one-pass fluid to the container 3.

[Brief explanation of the drawing]

The accompanying drawings are schematic illustrations of the device according to the invention. lφ2... Tank, 3... Container, 5/7... Solenoid valve. 12... Stirrer, 15... Container, 17... Impeller, 20-21... Pipe, 22... Pump, 26
... Ammeter, 30/31... Comparison circuit.

Claims (1)

[Claims] 1) The liquid to be conditioned is passed through a container (15) equipped with an impeller (17) driven by an electric motor (18), and the resistance provided by the impeller (17) is The corresponding energy consumption is measured by the measuring mechanism (26) and compared with at least one threshold set in the comparing mechanism (30, 31), and the output of the comparing mechanism is used to determine the energy consumption of the at least one valve. A viscosity adjusting device for liquids, particularly paints used in the manufacture of mirrors, characterized in that the viscosity of the liquid is adjusted by adjusting (5, 7). 2) Pump (22) that supplies liquid to one or more points of use
2. The device according to claim 1, further comprising a branch (20) for supplying liquid from the conveying pipe (21) to the container (15). 3) The impeller submerged in the liquid is placed in the container (15).
3. Device according to claim 1, characterized in that the outlet hole (16) is formed such that the opening (17) is movable. 4) at least one valve (7) regulates the flow rate of diluent into the container (3) containing the liquid, said pump (22)
removes the liquid from the container and directs it to the point of use and said container (15) and said outlet hole (16) of the container.
4. Device according to claim 1, characterized in that the container (3) is open to the container (3).