JPH05845Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention describes the internal structure of an ultrasonic concentration measurement tank suitable for measuring the concentration of graphite-based substances in liquid stored in a tank using an ultrasonic concentration meter. Regarding.

[Conventional technology]

In manufacturing aluminum foil used as automobile parts, it is necessary to measure the concentration of a graphite-based lubricating mold release agent. Conventionally, an ultrasonic attenuation type densitometer has been used to measure this concentration. When measuring the concentration of the lubricating mold release agent using this concentration meter, as shown in FIG. Stir and
The concentration of the graphite-based lubricating mold release agent in the liquid 14 was measured using an ultrasonic attenuation type concentration meter 16 inserted into the liquid 14 at the bottom of the tank 10.

That is, since the graphite-based lubricating mold release agent tends to settle at the bottom of the tank 10, the concentration of the mold release agent is measured by the concentration meter 16 while the liquid 14 is stirred by the rotation of the stirrer shaft 12. was.

[Problem that the invention attempts to solve]

However, when the level of the liquid 14 is filled to the specified liquid level 18, the liquid 14
Although it is possible to accurately measure the concentration of the lubricating mold release agent in the liquid 14, the level of the liquid 14 is
When the temperature drops below 8, there are air particles 2 in the liquid 14.
0 occurred, and the concentration of the lubricating mold release agent could not be measured with high accuracy using the concentration meter 16.

That is, the concentration meter 16 has a transmitting section and a receiving section, the transmitting section and the receiving section are each immersed in the liquid 14, the transmitting section transmits ultrasonic waves, and the receiving section receives the ultrasonic waves. Since the structure was configured to measure the concentration of the lubricating mold release agent in the liquid 14 from this reception level, air particles 20 were generated between the reception section and the transmission section.
If this occurs, the ultrasonic waves are reflected or attenuated by the air particles 20, making it impossible to accurately measure the concentration of the mold release agent in the liquid 14.

Therefore, the air particles 20 can be generated by changing the shape of the rotating blades 22 and 23 attached to the tip of the agitator shaft 12, by lowering the mounting position, or by lowering the rotational speed of the agitator shaft 12. However, these methods have the inconvenience of not being able to sufficiently control the generation of particulates 20 when the level of the liquid 14 decreases, and requiring the tank 10 to be larger. It was hot.

The present invention was developed in view of the above-mentioned conventional problems, and its purpose is to suppress the generation of air particles and accurately measure the concentration of graphite-based substances in liquid even when the liquid level is low. An object of the present invention is to provide an internal structure of a tank for ultrasonic concentration measurement.

[Means for solving problems]

In order to achieve the above object, the present invention stores a liquid containing a graphite-based substance in a tank, inserts an agitator shaft into the center of the tank, and agitates the liquid by rotating the agitator shaft. In a device that measures the concentration of graphite-based substances in a liquid using an ultrasonic concentration meter inserted into the tank, there is a wall on the side wall of the tank that extends above and below a specified liquid level, and a A sloped plate is provided that has a sloped surface that is inclined in a direction to guide the liquid in the upper layer to the lower layer of the tank, or prevents the movement of at least the liquid in the upper layer of the tank that flows through at least the agitator shaft and approximately the center of the tank side wall. The internal structure of the tank for ultrasonic concentration measurement is such that a through hole is formed on the side wall of the tank of this inclined plate to form a liquid flow path.

[Effect]

When the liquid is stirred by the rotation of the agitator, the liquid in the upper layer of the tank is guided to the lower layer of the tank by the inclined plate, and at least the liquid in the upper layer of the tank flows around the center of the agitator shaft and the tank side wall. The movement of the liquid is prevented by the inclined plate, and the liquid flowing on the side wall of the tank flows through the through hole of the inclined plate.

[Example of idea]

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

1 to 3 show the configuration of a preferred embodiment of the present invention.

In the present invention, inclined plates 24 and 26 are fixed to the side walls 10A and 10B of the tank 10, respectively, and the other configuration is the same as that in FIG.
Components that are the same as those in FIG. 6 are given the same reference numerals, and their description will be omitted.

The inclined plates 24 and 26 have inclined surfaces 24A and 26A that are inclined in a direction that guides the liquid in the upper layer of the tank 10 to the lower layer of the tank 10 as the agitator shaft 12 rotates, and the agitator shaft 12 and the tank side wall 10A, 10
Among the side walls 10A and 10B, the side walls 10A and 10B extend above and below a prescribed liquid level 18 at an angle of 45° to 60° with respect to the liquid level so as to prevent the movement of the liquid 14 flowing approximately in the middle of the liquid surface. It is fixed at 10B. Further, the side walls 24 and 26 include the tank side wall 1
A plurality of through holes 28 and 30 forming flow paths for the liquid 14 are bored on the 0A and 10B sides. Therefore, the liquid 14 on the side wall of the tank is absorbed into each through hole 28, 3.
Therefore, even if the inclined plates 24 and 26 are fixed to the side walls 10A and 10B, the stirring force is prevented from decreasing, and the lubricant is also prevented from adhering to the inclined plates 24 and 26. Ru.

Also, the width of the inclined plates 24 and 26 is the same as that of the tank 1.
The width of the stirrer shaft 12 is approximately 1/4 to 1/2 of the width of the stirrer shaft 12.

In the above configuration, when the liquid 14 is stirred by the rotation of the stirrer shaft 12, the liquid 14 forms a laminar flow state in the direction of arrow X and moves within the tank 10 with the stirrer shaft 12 as the center. At this time, the liquid in the upper part of the tank 10 is transferred to the tank 1 by the inclined plates 24 and 26.
0 will be guided to the lower layer side. Therefore, even if the liquid level decreased from the specified liquid level 18 to the liquid level 18A, generation of air particles 20 in the liquid 14 could be suppressed. In addition, since the inclined plates 24 and 26 are inclined at an angle of 45° to 60° with respect to the liquid level, sludge does not accumulate on the surfaces of the inclined plates 24 and 26, and the stirring power is not reduced. The liquid 14 can be stirred without any need for stirring. Therefore, in this embodiment, the liquid level is 18A.
Even if the temperature drops to 20, there are still air particles in the liquid 14.
Since the liquid 14 is not generated, the concentration meter 16
The concentration of graphite-based lubricating mold release agent inside can be measured with high accuracy.

Here, when the concentration of the mold release agent in the liquid 14 in the tank 10 was measured under the conditions shown below,
The experimental results shown by characteristic 100 in FIG. 4 could be obtained. Note that characteristic 102 shows the results of an experiment using a conventional tank.

Tank 10: 600 (length) x 600 (width) x 1000 (height) Slanted plate 24, 26: 150 (width) x 500 (length) x 2.3
(Thickness): Mounting angle 45° Through holes 28, 30: 30φ Stirrer shaft 12: 30φ×800 (length) Rotating blade 22: 200φ, 350γpm Concentration meter 16: Frequency 5MHz: Pitch between receiver and transmitter 200mm Liquid Surface variation width: 200mm, 0.90% graphite-based lubricating mold release agent.

Further, in the embodiment described above, the tank 10 is rectangular in shape, but as shown in FIG.
6, it is possible to obtain the same effects as in the embodiment described above, and it is also possible to prevent flasks from accumulating on the side wall of the tank 10 more fully than in the embodiment described above.

Further, in the embodiment, the inclined plates 24, 26
However, if the number of inclined plates is one or more, it is possible to suppress the generation of air particles 20 more than in a conventional tank.

[Effect of idea]

As explained above, according to the present invention, an inclined plate having through-holes is disposed on the side wall of the tank, so that even if the liquid level in the tank drops below the specified liquid level, the liquid in the liquid due to agitation is This technology suppresses the generation of air particles, making it possible to accurately measure the concentration of graphite-based substances in the liquid even if the liquid level in the tank drops below the specified level. Excellent effects can be obtained.

[Brief explanation of drawings]

Fig. 1 is a plan view of the tank according to the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a sectional view of the tank according to the present invention.
4 is a characteristic diagram showing the relationship between the liquid level and the concentration of the lubricating mold release agent.
The figure is a plan view showing another embodiment of the tank according to the present invention, and FIG. 6 is a longitudinal sectional view of a conventional tank. 10... Tank, 12... Stirrer shaft, 16...
Ultrasonic attenuation type concentration meter, 24, 26... Inclined plate, 2
8, 30...through hole.

Claims (1)

[Scope of utility model registration request] A liquid containing a graphite-based substance is stored in a tank, a stirrer shaft is inserted into the center of the tank, and the liquid is stirred by rotation of the stirrer shaft. In devices that measure the concentration of graphite-based substances, a device is installed on the side wall of the tank that extends above and below the specified liquid level in a direction that directs the liquid from the upper layer of the tank to the lower layer of the tank as the agitator shaft rotates. An inclined plate is provided that has an inclined surface and prevents the movement of at least the liquid in the upper layer of the tank that flows approximately at the center of the agitator shaft and the tank side wall. An internal structure of an ultrasonic concentration measurement tank characterized by having a through hole formed to form a flow path.