JPH07256197A - Coating material stirrer - Google Patents

Abstract

PURPOSE:To suppress waving of the liquid surface of a coating material during stirring and prevent uneven coating in a coating application stage by controlling the rotating speed of a stirring means so as to lower the speed with a decrease in the residual amt. of a coating material at the time of preventing the settlement by stirring the coating material housed in a container. CONSTITUTION:A revolving shaft 2A is erected within the container 1 housing the coating material P. Stirring vanes 2 are mounted at the bottom end of the shaft and a pulley 3 is mounted at its top end. On the other hand a motor 5 is installed atop the container 1 and a pulley 6 is mounted at its output shaft. A belt 7 is put around between the pulley 6 and the pulley 3. A sound wave sensor 8 is installed atop the vessel 1 and outputs the liquid level detection signal of the coating material P. Further, a controller 10 is installed in a position parting from the container 1. This controller is composed of a signal receiver RE which converts the liquid level detection signal to a digital signal, an arithmetic processing circuit CPU which calculates the respective numbers of revolutions of the stirring vanes 2 and the motor 5 in accordance with the digital signals and an inverter INV which outputs the driving electric power.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint stirring device for stirring paint contained in a tank or the like at regular intervals to prevent the paint from settling.

[0002]

2. Description of the Related Art Conventionally, a paint agitator for agitating the paint contained in a tank or the like to prevent the paint from settling, a person in charge turns on the paint agitating switch at regular intervals to rotate the motor at a constant speed. It is configured to be driven at a speed to rotate the stirring blade in the tank.

[0003]

In the above-mentioned conventional paint stirring device, the person in charge turns on the paint stirring switch at regular intervals.
Since the motor is driven at a constant rotation speed to rotate the stirring blades in the tank, the stirring blades in the tank can be rotated at a constant rotation speed regardless of the amount of paint in the tank. Since the amount of paint in the tank is reduced due to the rotation, the liquid level of the paint swells during stirring, and as a result, there is a problem that coating unevenness occurs in the coating process of the paint sent from the tank.

Therefore, in the present invention, when the paint contained in a container such as a tank is agitated to prevent the paint from settling, the rotating speed of the agitating means is slowed down as the amount of the paint remaining in the container decreases. The technical problem to be solved is to prevent the liquid surface of the paint from waving inside.

[0005]

A technical means for solving the above-mentioned problems is to provide a stirring means for stirring a paint when the paint stirring device is arranged in a container containing the paint and driven to rotate. , A motor for driving the stirring means in a variable rotation speed, a liquid level sensor for detecting the liquid level position of the paint contained in the container, and a liquid level detection signal from the liquid level sensor. A mode for calculating the remaining amount of paint and agitating the paint at the remaining amount by the agitating means to such an extent that the liquid surface does not ruffle.
It is configured to include a calculating means for calculating the motor rotation speed and a motor driving means for driving the motor at the rotation speed calculated by the calculating means.

[0006]

According to the paint agitator having the above structure, the liquid level sensor detects the liquid level position of the paint contained in the container, and when the liquid level detection signal is output to the calculating means, the calculating means causes the liquid level sensor to operate. When the remaining amount of paint is calculated based on the liquid level detection signal from the motor, the motor rotation speed for stirring the paint by the stirring means is calculated to the extent that the liquid level of the paint at the remaining amount does not undulate. Since the motor driving means rotates the motor at the calculated rotational speed, control is performed so that the rotational speed of the motor is lowered as the liquid surface position is lowered, and the liquid surface at the time of stirring the paint is changed. Ripple is suppressed.

When the liquid level sensor is a sound wave sensor, the sound wave level transmitted from the sound wave sensor is reflected by the liquid level of the coating material and the liquid level position is detected by the time until it is received again. .

When an inverter is used as the motor drive means, the rotation speed of the motor can be changed by changing the frequency of the drive power output from the inverter to the motor. The rotation speed of the stirring means is changed.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a control system diagram showing the overall configuration of the paint stirring device. As shown in FIG. 1, a rotary shaft 2A is vertically arranged in a tank (container) 1 in which a paint P is stored, and a stirring blade (stirring means) 2 is provided at a lower end portion of the rotary shaft 2A. Has been attached. The upper end of the rotating shaft 2A is projected on the upper surface of the tank (container) 1, and the pulley 3 is attached to the upper end.

A motor 5 is attached to the upper surface of the tank (container) 1, and a pulley 6 is attached to the output shaft of the motor 5. A belt 7 is hung between the pulley 6 and the pulley 3, and the rotational driving force of the motor 5 is transmitted to the rotary shaft 2A of the stirring blade 2. Since the paint P is generally flammable or explosive, the motor 5 has an explosion-proof structure or a safety-enhanced explosion-proof structure.

A sound wave sensor 8 is attached to the upper surface of the tank (container) 1 and outputs a liquid level detection signal corresponding to the distance to the liquid level of the paint P. Instead of the sound wave sensor 8, the paint P can be accurately applied even if a vapor is generated.
You may use what can detect the distance to the liquid surface of.

A control device 10 is provided at a position apart from the tank (container) 1. The control device 10 receives the liquid level detection signal output from the sound wave sensor 8 and converts the liquid level detection signal into a digital signal, and a receiver RE and a receiver R.
The liquid level detection signal converted into a digital signal at E is input, the remaining amount of the coating material P is calculated based on the liquid level detection signal, and the stirring blade 2 prevents the liquid surface of the coating material P from wavy. Of the stirring rotation speed of the motor 5, that is, the rotation speed of the motor 5, and outputs a drive signal corresponding to the calculated rotation speed of the motor 5, and a driving signal output from the calculation circuit CPU. Inverter IN for outputting drive power for rotating the motor 5 at a calculated rotation speed to the motor 5.
And V.

The arithmetic circuit CPU is a microcomputer.
And a storage unit such as a RAM and a ROM, which is based on the liquid level detection signal, and a rotation speed of the motor 5 corresponding to the remaining amount of the paint P. A calculation program is stored. Then, the microcomputer calculates the rotation speed of the motor 5 according to both calculation programs.

By configuring the paint agitator as described above, the rotation speed of the motor 5 is automatically reduced as the remaining amount of the paint P in the tank (container) 1 decreases. That is,
1200 rpm, 600 rpm, 30 rp shown in FIG.
m is an example of the number of revolutions of the motor 5 when the paint P is almost full, the remaining amount is almost halved, and when the remaining amount is low. Accordingly, the rotation speed of the motor 5 is automatically controlled so that the stirring rotation speed of the stirring blade 2 is reduced as the remaining amount of the coating material P is reduced so that the liquid surface of the coating material does not ruffle. . If the stirring control is performed at regular intervals, the paint P is prevented from settling.
Therefore, the arithmetic circuit CPU performs timed measurement, and the stirring control is performed every time a fixed time has elapsed.

[0015]

As described above, according to the present invention, as the liquid level of the paint contained in the container is lowered and the remaining amount is decreased, the rotation speed of the motor is automatically lowered, and the stirring means is provided. Since the stirring speed is controlled so as to slow down, even when the remaining amount of paint is low, it is possible to suppress the ripples on the liquid surface when stirring the paint. There is an effect that it can be lost.

[Brief description of drawings]

FIG. 1 is a control system diagram showing an overall configuration of an embodiment of the present invention.

[Explanation of symbols]

 1 Tank (Container) 2 Stirring Blade 5 Motor 8 Sound Wave Sensor 10 Controller RE Receiver CPU Arithmetic Circuit INV Inverter P Paint

Claims (3)

[Claims] 1. A stirrer for agitating the paint when it is placed in a container for storing the paint and rotationally driven, and a motor for driving the stirrer in a variable speed. A liquid level sensor that detects the liquid level position of the stored paint, and calculates the remaining amount of paint based on the liquid level detection signal from the liquid level sensor, and then the liquid level ripples the paint at the remaining amount. A calculation means for calculating the number of rotations of the motor which is agitated by the agitation means and a motor drive means for driving the motor at the number of rotations calculated by the calculation means are provided. Characteristic paint stirring device. 2. The paint stirring device according to claim 1, wherein the liquid level sensor is a sound wave sensor. 3. An agitator is used as the motor driving means, and the frequency of the drive power output from the inverter to the motor is varied to thereby change the rotation speed of the motor and agitate. The paint stirring device according to claim 1, wherein the number of revolutions of the means is variable.