JP2939724B2 - Ultrasonic cleaning method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic cleaning method and an apparatus for cleaning an industrial product by placing an object to be cleaned in a cleaning liquid in a cleaning tank and applying ultrasonic vibration to the cleaning liquid.

[0002]

2. Description of the Related Art Conventionally, as a device for washing relatively small industrial products in a washing tank, a rotating basket is provided in the washing tank, washing water containing a detergent is put in the washing tank, and the rotating basket is covered with the washing water. 2. Description of the Related Art There has been known an apparatus for washing an object to be washed by applying ultrasonic vibration to washing water by an ultrasonic generator provided on a side of a washing tank while rotating a rotating basket at a low speed while putting an object to be washed. .

[0003]

However, when a small metal part is cleaned using a conventional cleaning device of this kind, it is only necessary to put the metal part into a rotating basket and apply ultrasonic vibrations while rotating the metal part. At the time of washing, the metal parts in the rotating rotating basket are stationary and rotate with the weight or centrifugal force overlapping and sticking to the bottom and the peripheral wall of the basket. For this reason, even if ultrasonic vibration is applied to the cleaning liquid, it does not reach the inside of the overlapping metal parts, and dirt such as oily dirt and fine powder remains on that part, causing uneven cleaning of the object to be cleaned. There was a problem that cleaning could not be performed well.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an ultrasonic cleaning method and apparatus capable of satisfactorily cleaning relatively small objects to be cleaned without causing uneven cleaning. With the goal.

[0005]

In order to achieve the above object, an ultrasonic cleaning method according to the present invention is directed to an ultrasonic cleaning method in which an object to be cleaned is placed in a rotating basket which is rotatably disposed on a vertical axis of rotation in a cleaning tank. In the ultrasonic cleaning method, the cleaning liquid in the cleaning tank is ultrasonically vibrated by an ultrasonic generator provided on a side portion of the cleaning tank, and the rotating basket is rotated, the cleaning liquid is supplied from an injection nozzle disposed in the cleaning tank. The object to be cleaned is rotated around an axis orthogonal to the rotation axis by injecting the rotation.

Here, a pair or a plurality of pairs of spray nozzles are arranged in the cleaning tank, and the spray nozzles generate obliquely downward jets and obliquely upward jets in the cleaning liquid in the rotating basket.
The object to be cleaned can be rotated in the rotating basket. Also,
The point at which the object to be cleaned in the rotary basket is rotated around an axis orthogonal to the rotation axis can be located on the opposite side of the ultrasonic generator from the rotation axis.

[0007]

[Operation and effect] In the ultrasonic cleaning method having such a configuration,
The object to be cleaned is placed in the rotating basket in the washing tank, and ultrasonic vibration is applied to the cleaning liquid in the tank by an ultrasonic generator provided on the side of the washing tank, and the rotating basket is rotated and placed in the washing tank. The cleaning liquid is sprayed from the spray nozzle thus cleaned, and the object to be cleaned in the rotating basket is washed while being rotated about an axis orthogonal to the rotation axis of the rotating basket.

For this reason, the object to be cleaned that passes through the portion receiving the jet flow from the jet nozzle is rotated by the jet flow there, is separated from each other, changes its position and attitude, and then changes the position of the ultrasonic generator again. By receiving ultrasonic vibrations approaching the side and repeating the ultrasonic vibrations, the ultrasonic vibrations hit all surfaces and locations of the object to be cleaned, so that cleaning can be performed well without causing unevenness in cleaning.

Further, if a pair or a plurality of pairs of injection nozzles are arranged in the cleaning tank, and these injection nozzles generate an obliquely downward jet and an obliquely upward jet in the cleaning liquid in the rotating basket,
The object to be cleaned can be better rotated in the rotating basket. Further, if the part for rotating the object to be cleaned in the rotary basket about an axis orthogonal to the rotation axis is located on the opposite side of the ultrasonic generator with respect to the rotation axis, it is possible to perform better cleaning. .

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an ultrasonic cleaning apparatus, and FIG.
Is a box-shaped machine frame, and a washing tank 12 with a lid 14 is formed on the upper part of the machine frame 1. A mounting plate 2 is horizontally fixed substantially at the center of the machine frame 1, and a rotating shaft 3 is mounted in a vertical direction (vertical direction) by a bearing 4 at the center of the mounting plate 2. At the upper end of the rotating shaft 3 located in the washing tank 12, a holding frame 5 having a Y-shaped or cross-shaped planar shape is fixed horizontally, and a rotating basket 6 for putting an object to be cleaned on the holding frame 5 is provided. Fixed.

The rotating basket 6 is formed in the shape of a substantially cylindrical basket having an open upper surface. In particular, a conical conical projection 7 bulging inward is provided at the bottom center thereof. The inclined surfaces 6a and 6b which are inclined by about 45 degrees are formed at the corners of the bottom outer periphery and the upper periphery. The inclined surface of the conical projection 7 is also inclined at about 45 degrees with respect to the vertical surface.

A pulley 10 is mounted on the lower end of the rotating shaft 3, a reduction gear is provided on an output shaft of a motor 8 mounted in the machine frame 1, and a pulley 9 mounted on the output shaft of the reduction gear is provided. The pulley 10 is linked by a belt 11, and the rotation shaft 3, that is, the rotating basket 6 on the holding frame 5 is driven to rotate at a low speed by the driving of the motor 8.

An ultrasonic generator 13 is mounted on the upper part of the machine frame 1, that is, on the side of the cleaning tank 12, so as to apply ultrasonic vibration to the cleaning liquid in the cleaning tank 12. When the size of the rotating basket 6 is, for example, 290 mm in diameter and 150 mm in height, an ultrasonic generator having an ultrasonic frequency of 28 KHz and an output of about 600 W can be used. Is preferably within 100 mm in this case.

Further, in the cleaning tank 12, a pair of cleaning water is jetted to the object to be cleaned so that the object to be cleaned in the rotary cage 6 is rotated around an axis substantially perpendicular to the rotating shaft 3. Injection nozzles 15 and 16 are provided. That is, one injection nozzle 15 is disposed near the upper inclined surface 6a in the rotating cage 6 along the inclined surface 6a and facing inward, and the other injection nozzle 16 is disposed below the injection nozzle 15. And rotating basket 6
Is arranged so as to spray the washing water along one inclined surface of the conical projection 7 in the rotating basket 6. As shown in FIG. 1, the pair of injection nozzles 15 and 16 are arranged so as to face each other in an off-axis state, and are arranged on the opposite side of the ultrasonic vocal device 13 about the rotation shaft 3. . 17
Is a holder for supporting the injection nozzle 15.

As described above, the pair of injection nozzles 15, 16
Is on the same vertical plane, and the cleaning water is jetted toward the inside of the rotating basket 6 in an opposed state where the axis is shifted. These jets are rotated and stirred clockwise in the basket as shown in FIG.

A washing water tank 18 is provided on the side of the machine casing 1, and washing water containing a detergent is stored in the tank. An injection pump 19 is provided, the suction side of which is inserted into the tank 18, and the discharge side of which is connected to the pipe 20 and the branch pipes 20a, 20a.
b, they are connected to the injection nozzles 15 and 16. A water supply pump 21 is provided, the suction side thereof is connected to the tank 18, and the pipe 22 on the discharge side thereof is connected to the cleaning tank 12. Reference numeral 23 denotes an overflow device for returning the washing water overflowing from the washing tank 12 to the tank 18; 24, a drain pipe for returning the washing water in the washing tank 12 to the tank 18;
Is a control panel for the ultrasonic generator 13.

Next, an ultrasonic cleaning method performed by using the cleaning apparatus having the above-described configuration will be described.

Prior to cleaning, small metal parts are put into the rotating basket 6 as objects to be cleaned, and a water supply pump 21 is driven to supply a predetermined amount of cleaning water (a suitable amount of detergent is added to water) into the cleaning tank 12. Insert). With the start of washing, the rotating basket 6 is rotated at a low speed by the motor 8 via the rotating shaft 3, and washing water is supplied from the pair of injection pumps 15 and 16 to the arrows A and B in the rotating basket by the operation of the injection pump 19. The ultrasonic wave is applied to the cleaning water from the side of the cleaning tank 12 by operating the ultrasonic generator 13. Here, the rotation speed of the rotary cage 6 is suitably 10 to 20 rpm,
The injection pressure of 5 and 16 is suitably 1 to 5 MPa.

With the rotation of the rotary basket 6, the object W to be washed, which has reached the vicinity of the left side (ultrasonic generator 13) in FIG. 1
5, 16) The article W to be cleaned reaches the vicinity of the injection nozzle 15,
It rotates by receiving the washing water from 16. That is, FIG.
As shown in the figure, the spray nozzle 15 sprays the washing water toward the inside of the basket along the upper inclined surface 6a of the rotating basket 6 to generate an obliquely downward jet A, and the spray nozzle 16 is positioned below the rotating basket 6. Obliquely rising jet B along the slope of the conical projection 7 in the basket
Cause. The obliquely descending jet A and the obliquely rising jet B are generated at positions facing each other with their axes shifted in the same vertical plane, and are jetted toward the object W to be cleaned. And stirred.

For this reason, the object W to be cleaned that has passed
Are rotated and separated from each other, and their positions and postures are changed. Thereafter, they approach the ultrasonic generator 13 again and receive ultrasonic vibration, so that different surfaces and portions are cleaned by ultrasonic vibration. Is done. Then, by repeating such a cleaning operation, the object to be cleaned W is entirely and uniformly cleaned efficiently and satisfactorily. At the end of cleaning, the cleaning tank 12
The washing water inside is returned to the washing water tank 18 through the drain pipe 24, and then the rinse water is applied to the object to be washed, followed by rinsing, followed by centrifugal dehydration and drying.

It should be noted that the pair of injection nozzles 15 and 16 may be a plurality of pairs, and the positions thereof are preferably at the upper and lower parts of the rotating basket on the opposite side of the ultrasonic wave generator 13, but also at other locations. Any location can be used as long as it can be rotated by applying a jet to the object to be cleaned in the basket.

[0023]

EXAMPLES Next, examples performed to confirm the effects of the present invention will be described. In the embodiment, the ultrasonic frequency of the ultrasonic generator 13 is 28 KHz, and the ultrasonic output is 6 kHz.
00 W, the size of the rotating cage 6 is 290 mm in diameter, 150 mm in height, 2.9 L in capacity, and the rotation speed is 10 rpm.
And

As the objects to be cleaned, a disc-shaped tappet shim of 34 mm in diameter and 3 mm in thickness made of SCM and a bowl-shaped floppy center core of 29 mm in diameter and 1.5 mm in thickness made of stainless steel were used. The object to be cleaned was stained with a 25% solution of cerium oxide and placed in the rotating basket 6.

As the washing water, washing water of about 60 ° C. containing about 3% of a commercially available detergent was used. In the case of the embodiment of the present invention, the tappet shim has a spray nozzle 15, 16 to 30 kg / cm.
^Then, a jet of 20 kg / cm ² was applied to the floppy center core from a jet nozzle, and ultrasonic cleaning was performed for 5 minutes. Further, as a comparative example, ultrasonic cleaning was also performed without spraying from the spray nozzle, and the removal rate of those stains was determined as a ratio (%) to the weight of solids removed by extraction with nor-hexane.

The results are shown in Table 1. As can be seen from Table 1, in the floppy center core, the dirt removal rate of this embodiment is improved by about 40% as compared with the case of using only the ultrasonic wave, and the tappet shim is improved. It can be seen that the dirt removal rate of the present embodiment is also improved in the case of (1).

[0027]

[Table 1]

Further, Table 2 shows the dirt removal rate when a plurality of objects to be cleaned having different shapes are cleaned by the ultrasonic cleaning apparatus. The object to be cleaned a is a variant and has a diameter of 3
6.5 mm, length 32 mm, object b to be cleaned is a rod, diameter 6 mm, length 18 mm, object c to be cleaned is cylindrical, diameter 6 m.
m, length 11 mm, object to be cleaned d is bowl-shaped, diameter 29 m
m, thickness 2 mm. As shown in Table 2, regardless of the shape of the object to be cleaned, it can be seen that the object was cleaned well with an excellent dirt removal rate.

[0029]

[Table 2]

Further, items to be cleaned a to
As for d, as shown in FIG.
Samples Nos. 5 and 26 were cleaned using a cleaning device arranged on the ultrasonic generator 13 side, and their dirt removal rates were determined. The removal rate in that case was compared with the example in Table 2 above. The results are shown in Table 3. From Table 3, both obtained a good dirt removal rate of about 90% or more. However, depending on the shape of the object to be cleaned, as shown in FIG. It is understood that the removal rate is better when the nozzles 15 and 16 are provided on the side opposite to the ultrasonic generator 13 than when the injection nozzles 25 and 26 are disposed on the ultrasonic generator 13 side as shown in FIG. .

[0031]

[Table 3]

[Brief description of the drawings]

FIG. 1 is a sectional configuration view showing an ultrasonic cleaning apparatus according to one embodiment of the present invention.

FIG. 2 is a schematic front view of an ultrasonic cleaning apparatus according to another embodiment.

[Description of Signs] 3-Rotating shaft 6-Rotating basket 12-Washing tank 13-Ultrasonic generator 15, 16-Injection nozzle

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-51643 (JP, A) JP-A-54-69260 (JP, A) JP-A 10-113626 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) B08B 3/12

Claims (5)

(57) [Claims] 1. An object to be cleaned is placed in a rotating basket rotatably arranged on a vertical rotating shaft in a cleaning tank, and the cleaning liquid in the cleaning tank is removed by an ultrasonic generator provided on a side of the cleaning tank. In the ultrasonic cleaning method of performing ultrasonic vibration and cleaning while rotating the rotating basket, the cleaning liquid is sprayed from a spray nozzle disposed in the cleaning tank, whereby the rotation is performed around an axis orthogonal to the rotation axis. An ultrasonic cleaning method comprising rotating the object to be cleaned in a basket. 2. An obliquely downward jet and an obliquely upward jet are generated in the cleaning liquid in the rotary basket by a pair or a plurality of pairs of injection nozzles arranged in the cleaning tank, and the object to be cleaned is rotated in the rotary basket. The ultrasonic cleaning method according to claim 1, wherein the ultrasonic cleaning is performed. 3. A location where the object to be cleaned in the rotary basket is rotated about an axis orthogonal to the rotary axis is located on the opposite side of the ultrasonic generator from the rotary axis as a center. The ultrasonic cleaning method as described. 4. A rotating basket is rotatably arranged in a washing tank with a vertical rotation axis, and an object to be washed is put in the rotating basket, and the washing basket is set by an ultrasonic generator provided on a side of the washing tank. An ultrasonic cleaning device that applies ultrasonic vibration to the cleaning liquid in the container and performs cleaning while rotating the rotating basket, wherein a conical projection is formed substantially at the center of the rotating basket, and an upper outer peripheral corner of the rotating basket and An inclined surface is formed at the lower outer peripheral corner, and a pair or a plurality of pairs of injection nozzles are arranged in a state where they face off-axis along the inclined surface of the conical projection and the inclined surface of the corner. An ultrasonic cleaning device characterized by the above-mentioned. 5. The ultrasonic cleaning device according to claim 4, wherein the injection nozzle is disposed on the opposite side of the ultrasonic generator with respect to the rotation axis.