JPS621291B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a double tank type ultrasonic treatment device used in electrolysis devices, cleaning devices, etc. that utilize ultrasonic waves.

Generally, when performing surface treatment such as electrolysis or cleaning on a material to be treated in a highly corrosive solution using ultrasonic waves, if the corrosive solution comes into direct contact with the ultrasonic vibrator, the ultrasonic vibrator will be damaged. To prevent corrosion and shorten the life of the ultrasonic vibrator, the ultrasonic processing equipment has a double tank structure, and the ultrasonic vibrator is installed in the outer tank. In addition, the inner tank should be made of a material that allows ultrasonic waves to easily pass through and will not be affected by corrosive solutions. Perform ultrasonic treatment such as

However, in conventional ultrasonic treatment equipment with a double tank structure, stainless steel is used as the outer tank material, and synthetic resin or glass, which is not easily attacked by corrosive solutions, is used as the inner tank material. When manufacturing a tank, it is necessary to increase the wall thickness of the inner tank from the viewpoint of strength, which increases the material cost and increases the wall thickness of the inner tank. The ultrasonic energy transmitted from the sonic vibrator is attenuated when passing through the inner tank, so in order to transmit the appropriate intensity of ultrasonic energy to the processing liquid in the inner tank, the output of the ultrasound must be increased. There was a point that it was necessary and uneconomical.

The present invention uses resin with a thickness of 2 mm or less for the inner tank, has a space of 100 mm ² or more, and has an area of the space of S ₁
When the area of the surrounding non-space part is S ₂ ,
By placing a reinforcing frame with S ₂ /S ₁ <0.5 in contact with the inner tank between the housing section and the ultrasonic transducer so that the ultrasonic waves pass through the space, the ultrasonic wave can be reduced. An ultrasonic processing device with reduced attenuation is provided.

The explanation will be given below based on the figures. Figures 1 to 3
In the figure, 1 is an outer tank made of stainless steel or resin-lined steel, 2 is an ultrasonic transducer placed inside the outer tank, and 3 is a rectangular cylindrical assembly type reinforcement placed between the two ultrasonic transducers. The ultrasonic wave passage part 3a facing the ultrasonic transducer 2 is configured in a mesh shape in the frame. The area of one space 3b of the ultrasound passage section 3a is 100
mm ² or more, and the ratio of the area of the non-space part 3c to the area of the space part 3b (area of the non-space part S ₂ / area of the space part
S ₁ ) is below 0.5. . Reference numeral 4 denotes a bag-shaped inner tank made of resin with a thickness of 2 mm or less, which has a storage section 4a in which a member to be processed (not shown) is stored, and is reinforced by abutting against the reinforcing frame 3.

When injecting the treatment liquid 5 and the non-corrosive liquid 6, attach the liquid level switches 7 and 8, operate the electromagnetic valves 9 and 10, and inject the treatment liquid 5 into the inner tank 4.
A non-corrosive liquid 6 is poured into the outer tank 1. During the injection process, the floats 11 and 12 detect the liquid level in the outer tank 1 and the inner tank 4 with the liquid level detectors 13 and 14, and the difference between the two liquid levels is compared with the comparator 15, and an adjustment signal is generated. Solenoid valve 9 or 1 sent to servo valve 16
0, and pouring the liquid while maintaining the same liquid level in the outer tank 1 and the inner tank 4.

That is, when the liquid level in the inner tank 4 is higher than the liquid level in the outer tank 1, the solenoid valve 9 opens and the solenoid valve 10 opens.
closes. On the other hand, when the liquid level in the outer tank 1 is higher than the liquid level in the inner tank 4, the liquid level detectors 13, 14 and the comparator 15 operate so that the electromagnetic valve 10 opens and the electromagnetic valve 9 closes. Therefore, the outer and inner surfaces of the inner tank 4 made of resin sheets are always maintained at approximately the same surface pressure, so even when manufacturing a large-capacity ultrasonic device, it is not necessary to reduce the thickness of the inner tank material as in the past. There is no need to make it large, and a thin sheet of material can be used.

For example, stainless steel assembled into a mesh structure is suitable for the reinforcing frame 3. There is a correlation between the size of the mesh and the transmittance of ultrasound, for example at 28KHz.
The relationship between the mesh size and the ultrasonic transmittance in ultrasonic vibration is shown in FIG. In other words, in the case of a mesh using stainless steel wire with a diameter of 1 mm,
If the mesh size is 5 mm or less, the ultrasonic transmittance is 50
% or less. On the other hand, when the mesh size is 10 mm or more, ultrasonic waves are hardly affected by the mesh and exhibit almost 100% transmittance. Therefore, it is desirable that the area of the mesh space is 100 mm ² or more. As the area of the non-space around the mesh space increases, the attenuation of ultrasonic energy increases, but as above, in 28KHz ultrasonic vibration,
When stainless steel wire with a diameter of 1 mm is used, as shown in Figure 5, the ratio of the area of the non-space part of the mesh to the area of the space surrounded by the non-space part of the mesh (area of the non-space part S ₂ / When the area S ₁ ) of the space is less than 0.5, the attenuation of the ultrasonic energy is very small.

In addition, no difference is observed in the transmittance of ultrasonic waves when the shape of the mesh space is polygonal, circular, or a combination thereof.

Note that resins with excellent chemical resistance such as polyester, polyethylene, polypropylene, polystyrene, Teflon, nylon, Tetron, and polyvinyl resins are suitable as materials for the inner tank.

Since the ultrasonic processing apparatus according to the present invention can use a thin resin plate as the inner tank material, the attenuation of ultrasonic energy by the inner tank material is extremely small, and the output of the ultrasonic vibrator can be reduced.
In addition to reducing the material cost of the inner tank material, it is extremely economical.

In addition, since there is almost no attenuation of ultrasonic energy by the inner tank, it is possible to obtain almost the same amount of strong ultrasonic energy as when an ultrasonic transducer is placed directly into the processing liquid in the inner tank. This enables high-speed processing such as ultrasonic electrolytic treatment and ultrasonic cleaning.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of one embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, Fig. 3 is a front view of the reinforcing frame, and Fig. 4 shows the size and size of the mesh of the reinforcing frame. FIG. 5 is an explanatory diagram showing the relationship between the ultrasound transmittance and the ratio of the area of the non-space portion to the area of the mesh space and the ultrasound transmittance. In the figure, 1 is an outer tank, 2 is an ultrasonic vibrator, 3 is a reinforcing frame,
3a is an ultrasonic wave passage part, 3b is a space part, 3c is a non-space part, 4 is an inner tank, and 4a is a storage part. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. An inner tank made of resin with a thickness of 2 mm or less and having a housing section filled with a processing solution and containing a member to be processed is arranged in an outer tank filled with a non-corrosive liquid, and both of the above-mentioned An ultrasonic transducer is placed between the tanks, and 100
It has multiple spaces of mm ² or more, and the area of the above spaces is
When S ₁ and the area of the surrounding non-space part are S ₂ ,
A reinforcing frame having S ₂ /S ₁ <0.5 is disposed between the storage section and the ultrasonic vibrator in contact with the inner tank so that the ultrasonic waves pass through the space. Ultrasonic treatment equipment.