JPH08112575A - Ultrasonic cleaner - Google Patents

Abstract

PURPOSE: To prevent the cost and power consumption of even a large-sized cleaner from being increased, to solve a noise problem and to conduct uniform cleaning by obviating the nonuniformity of the sound pressure in a cleaning soln. CONSTITUTION: A long-sized work 1 to be cleaned is held with the left and right supports 2a and 2b, dipped in a cleaning soln. in a rectangular cleaning tank 3 and vertically reciprocated by a support lift 4. Meanwhile, a vibrator base 5 positioned below the supports 2a and 2b in the tank is reciprocated in the longitudinal direction (horizontal direction) of the tank 3 by a vibrator mover 6. Besides, ultrasonic vibrators 8a to 8d mounted on the vibrator base 5 are driven by resultant wave oscillators 40a and 40b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic cleaning apparatus suitable for cleaning a long work (object to be cleaned).

[0002]

2. Description of the Related Art Conventionally, an ultrasonic cleaning device has been widely put to practical use for cleaning various works such as mechanical parts and electronic parts. This device is equipped with a cleaning tank to which a cleaning liquid is supplied and a cleaning tank. It is equipped with an ultrasonic vibrator installed inside, and causes cavitation in the cleaning liquid by the ultrasonic vibrator when the work is immersed in the cleaning liquid in such a tank, and the cavitation action is used for cleaning. is there.

[0003]

However, since this cleaning apparatus uses the non-synthetic single wave oscillator as the oscillator for driving the ultrasonic vibrator, the sound pressure distribution in the cleaning liquid is nonuniform (variation is uneven). However, uniform cleaning was hindered.

In addition, because the ultrasonic vibrator is mounted in the cleaning tank, if the cleaning tank is provided in a large size, the number of ultrasonic vibrators to be mounted must be increased correspondingly.
Therefore, not only the cost of the apparatus becomes high, but also the power consumption increases and the noise problem easily occurs. In particular, in the case of a large apparatus capable of simultaneously cleaning a plurality of long workpieces (objects to be cleaned),
It was remarkable.

In view of these drawbacks, the present invention has made intensive studies to solve them, and as a result, replaced an oscillator for driving an ultrasonic transducer with a conventional non-synthetic single-wave type oscillator.
A composite wave type that can oscillate a composite wave of a fundamental wave and a plurality of kinds of weighted waves is used, and further, it has a plurality of work receivers mounted at predetermined intervals in a direction orthogonal to the longitudinal direction of the rectangular cleaning tank. A vertical movement of a pair of workpiece supports arranged in the longitudinal direction of the cleaning tank so as to be opposed to each other, and a plurality of workpiece supports positioned below the supports and orthogonal to the longitudinal direction of the cleaning tank. Even if a large-scale device is configured, the unevenness of sound pressure distribution in the cleaning liquid can be prevented by configuring the vibrator base equipped with the ultrasonic vibrator described above to move in the longitudinal direction. It has been found that the obtained product can be uniformly washed, and the device cost and power consumption can be increased and a noise problem can be prevented.

[0006]

That is, an ultrasonic cleaning apparatus according to the present invention comprises a rectangular cleaning tank to which a cleaning liquid is supplied,
A pair of work supports having a plurality of work receivers mounted at predetermined intervals in a direction orthogonal to the longitudinal direction of the cleaning tank and arranged at predetermined intervals in the longitudinal direction of the cleaning tank so as to face each other. A tool, a support tool elevating device capable of vertically moving the pair of workpiece supports together with the cleaning tank so as to move up and down together in the cleaning solution in the tank, and the inside of the tank. Located in a tank below the work support moved into the cleaning liquid,
Further, a vibrator base in which a plurality of ultrasonic vibrators are mounted at predetermined intervals in a direction orthogonal to the longitudinal direction of the cleaning tank, and a vibrator moving device that reciprocates the vibrator base in the longitudinal direction of the cleaning tank. And a synthetic wave oscillator for driving the ultrasonic oscillator. It is preferable that the combined wave oscillator can oscillate a combined wave of the fundamental wave and the two kinds of weighted waves.

[0007]

In FIG. 1, a long cylindrical work 1 to be cleaned is supported by the left and right work supports 2a and 2b and immersed in the cleaning liquid in the rectangular cleaning tank 3, so that both work supports 2a and 2b are supported. 2b are vertically reciprocated together in the cleaning liquid by the support lifting device 4. Also, both work support tools 2
The vibrator base 5 located in the tank below a and 2b is reciprocated in the longitudinal direction (horizontal direction) of the rectangular cleaning tank 3 by the vibrator moving device 6.

The work supports 2a and 2b are provided with eight work receivers 7a and 7b (see FIG. 3) in a direction (front-back direction) orthogonal to the longitudinal direction (horizontal direction) of the rectangular cleaning tank 3. In addition, the transducer base 5 is equipped with four ultrasonic transducers 8a to 8d in the same direction (front-back direction).

Therefore, for a group of eight long workpieces,
A cavitation effect can be imparted through the four ultrasonic vibrators 8a to 8d, and the work 1 group and the ultrasonic vibrators 8a to 8d are moved closer to and away from each other to effectively impart the cavitation effect. Therefore, even if the device is configured as a large-sized device, it is possible to prevent an increase in device cost and power consumption, and to prevent a noise problem from occurring. Further, at that time, since the ultrasonic transducers 8a to 8d are driven by the synthetic wave oscillators 40a and 40b, it is possible to prevent the sound pressure distribution in the cleaning liquid from being nonuniform and to perform uniform cleaning.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below. FIG. 1 is a front view and FIG. 2 is a plan view of this drawing.
3 and FIG. 3 which is a Z arrow view of FIG.
Has a rectangular shape in a plan view, that is, is provided longer in the arrow X direction in the figure than in the front-rear direction orthogonal to the X direction (horizontal direction) in the arrow (hereinafter, this direction is referred to as the longitudinal direction), and is new. A supply port 10 for supplying the cleaning liquid, a discharge port 11 for extracting the cleaning liquid used and contaminated, and the like are mounted.

Further, the apparatus frame 11 mounted so as to straddle the cleaning tank 3 in the longitudinal direction has the left and right legs 12
The upper frame 13 is attached to the upper ends of the b and 12a, and the vertical frames 14a and 14 are attached to the upper frame 13.
b, the frame 13,
The support elevating device 4 and the vibrator moving device 6 are attached via 14a and 14b.

That is, the support moving device 4 includes a shaft 16 rotatably supported by bearings 15a and 15b mounted on the vertical frames 14a and 14b, and a driving device 17 mounted on the upper frame 13. The shaft coupling 18 that connects the output shaft of the device 17 to the shaft 16, the pinions 19a and 19b mounted on the shaft 16, and the slide guide rail mechanisms 20a and 20b, the vertical frames 14a and 14
Arms 21a, 21 mounted on b so as to be able to move up and down
b and the rack 2 attached to the arms 21a and 21b
2a, 22b, three photoelectric tube type sensors 23 (see FIG. 2) mounted on the vertical frame 14a at predetermined positions on the upper, middle and lower ends thereof, and a light shielding piece 24 mounted at a predetermined position on the arm 21a. It consists of and.

Therefore, the arms 21a and 21b can be moved up and down by rotating the shaft 16 in the forward and reverse directions by the driving device 17, and at that time, by the light shielding piece 24 which is moved up and down together with the arm 21a, When the light rays detected by the photoelectric tube type sensors 23 mounted at the predetermined positions of the middle portion and the lower end portion of the vertical frame 14a are blocked, the rotation direction of the output shaft of the prime mover 17 is controlled in the opposite direction based on the signal. It

Therefore, the work supports 2a and 2b mounted on the lower ends of the arms 21a and 21b are attached to the rectangular cleaning tank 3 respectively.
It can be reciprocated up and down in the cleaning liquid inside, and when the light beam detected by the photoelectric tube type sensor 23 mounted at a predetermined position on the upper end of the vertical frame 14a is blocked,
Based on the signal, the rotation of the output shaft of the prime mover 17 is stopped, whereby the work supports 2a and 2b can be moved slightly above the upper end of the rectangular cleaning tank 3.

The vertical reciprocation in the cleaning liquid in the rectangular cleaning tank 3 is performed during the cleaning of the work, and
The movement of the rectangular cleaning tank 3 slightly above the upper end is carried out when the work is taken in and out of the tank. Further, the work support tools 2a and 2b are constructed by mounting eight work receivers 7a and 7b at predetermined intervals on brackets 25a and 25b (see FIG. 3) mounted on the lower ends of the arms 21a and 21b. However, the receivers 7a and 7b are formed in a semicircular shape.

Therefore, both ends 7a and 7b can support the end portion in the longitudinal axis direction of the cylindrical elongated work 1 to be cleaned, and the work 1 thus supported.
Owing to its own weight, it does not separate from both receivers 7a and 7b even when it is immersed in the cleaning liquid. Note that FIG. 3 shows a state in which the arms 21a and 21b are moved downward as much as possible so that they are brought close to the upper surface of the upper frame 13.

Next, the vibrator moving device 6 includes a rack 30 mounted on the upper frame 13, a pinion 32 mounted on an output shaft of a driving device 31, and one movable bracket on which the driving device 31 is mounted. 33 (see FIG. 3), the gate-shaped bracket 35 suspended by the bracket 33 and the other movable bracket 34, and mounted on the upper frame 13 at predetermined positions of the right end portion, the intermediate portion, and the left end portion. It is composed of three photoelectric tube type sensors 36 (see FIG. 2) and a light shielding piece 37 attached to an intermediate portion of the movable bracket 34.

Incidentally, these movable brackets 33, 34
Is mounted so as to be movable to the upper frame 13 via the slide guide rail mechanisms 38a and 38b, that is,
The upper frame 13 is mounted so as to be movable in the extending direction (longitudinal direction of the rectangular cleaning tank 3).

Therefore, the movable brackets 33, 34 and the gate-shaped bracket 35 can be reciprocated in the longitudinal direction of the rectangular cleaning tank 3 by rotating the output shaft of the prime mover 31 forward and backward, and at that time, When the light-shielding piece 37 that is reciprocally moved in the horizontal direction together with the movable bracket 34 shields the light rays detected by the photoelectric tube type sensors 36 mounted at the predetermined positions of the right end portion and the left end portion of the upper frame 13, Based on the signal, the rotation direction of the output shaft of the prime mover 32 is controlled in the reverse direction.

Therefore, the vibrator base 5 mounted on the lower end of the gate-shaped bracket 35 so as to be positioned in the tank below the work supports 2a and 2b is connected to one end of the rectangular cleaning tank 3 in the longitudinal direction. It can be reciprocated between the opposite ends.

When the light beam detected by the photoelectric tube type sensor 36 mounted at a predetermined position in the middle of the upper frame 13 is blocked, the rotation of the output shaft of the motor 32 is stopped based on the signal, and The ultrasonic transducers 8a-8
The vibrator base 5 to which d is attached can be moved to an intermediate portion in the longitudinal direction of the rectangular cleaning tank 3.

The reciprocating movement between one end and the other end of the rectangular cleaning tank 3 in the longitudinal direction is performed during the cleaning of the workpiece, and the movement of the rectangular cleaning tank 3 at the intermediate portion in the longitudinal direction is stopped. It is performed when putting the work in and out of the tank.

During cleaning, the empty work supports 2a and 2b are moved slightly above the upper end of the rectangular cleaning tank 3 and the work receiving device 7 is operated by using an appropriate cargo handling device.
The work 1 is supported by a and 7b, and then a control panel switch (not shown) is turned on to operate the prime movers 17 and 31, and the upper ends of the vertical frames 14a and 4b are respectively provided with 2 pieces.
The composite wave oscillators 40a and 40b mounted individually are operated.

Then, each of the oscillators 40a and 40b oscillates a composite wave of the fundamental wave and a plurality of kinds of weighted waves, whereby the ultrasonic vibrators 8a to 8d are driven and the work supports 2a and 2b are moved. The work receivers 7a and 7b are moved downward together, and the work 1 group supported by the work receivers 7a and 7b is immersed in the cleaning liquid in the rectangular cleaning tank 3. In addition, the ultrasonic transducers 8a to 8d and the synthetic wave oscillators 40a and 40d.
0b are mounted in a pair with each other.

Thereafter, the cleaning liquid is reciprocated up and down for a predetermined time. In parallel with this, the gate-shaped bracket 35 is reciprocated in the longitudinal direction of the rectangular cleaning tank 3. Therefore, together with this, the vibrator base 5 is reciprocated in the same direction. The vibrator base 5 is reciprocated between one end of the rectangular cleaning tank 3 in the longitudinal direction and the other end opposite thereto.

Therefore, the cavitation action by the four ultrasonic transducers 8a to 8d mounted on the transducer base 5 can be imparted over the entire length of the eight long works 1, and the ultrasonic transducers can be provided. The work 1 can be moved toward and away from the workpieces 8a to 8d so that the cavitation effect can be effectively exerted, and even if the workpiece 1 is configured in a large size, it is possible to prevent an increase in the cost and power consumption of the apparatus. At the same time, the occurrence of noise problems can be prevented.

At that time, the ultrasonic transducers 8a to 8d
However, since it is driven by the synthetic wave oscillators 4a and 4b, it is possible to prevent the sound pressure distribution in the cleaning liquid from becoming non-uniform and to perform uniform cleaning. The measurement results of the sound pressure distribution are shown in FIGS. These measurement results are obtained by immersing the sound pressure sensor in the positions P1 to P5 shown in FIG.

In the figure, L1 is 190 mm, L2 is 710 mm, L3 is 700 mm, L4 is 190 mm, L
5 is 490mm, L6 is 480mm, L7 is 70mm,
L8 is 1100 mm and L9 is 770 mm.

The synthetic wave oscillators 40a and 40b for driving the ultrasonic transducers 8a to 8d are 600 W, and the fundamental wave is 2 W.
8 KHz, weighted waves of 100 KHz and 200 KHz triple wave type, and ultrasonic transducers 8a-8
d is the intermediate position in the X direction of the cleaning unit and is 460 mm below the liquid surface
Located in.

All of the synthetic wave oscillators 40a and 40b were output, that is, 2400 W was output, and the cleaning liquid used was a nonionic surfactant 5% cleaning liquid having a liquid temperature of 40 ° C. and dissolved oxygen of 3.7 ppm. Under these conditions, the sound pressure sensor was dipped at positions P1 to P5 downward from the liquid surface at intervals of 10 mm to a position 120 mm above the ultrasonic transducers 8a to 8d.

In addition, sound pressure distributions when a non-synthetic single wave oscillator is used are shown in FIGS. Figure 13 is 25KH
z, FIG. 14 shows the case of using 50 KHz, and FIG. 15 shows the case of using the non-synthetic single wave oscillator of 75 KHz, respectively. The cleaning liquid and the measurement interval are the same as when the above-mentioned synthetic wave oscillator is used. When comparing FIGS. 8 to 12 with FIGS. 13 to 15, it can be seen that the variations in FIGS. 8 to 12 are smaller, and therefore it is more advantageous to use the synthetic wave oscillator.

Although one embodiment of the present invention has been described above, in the present invention, the work support of the work support is
As shown in FIGS. 4 to 6, the drive roller 4 includes a free roller 42 and a drive roller 43.
3 may be provided in a mode in which the pinion 45 that is engaged with the fixed rack 48 and rotated when the work support is moved up and down is mounted.

By providing such a mode, it is possible to rotate the work during cleaning so that the cavitation effect can be uniformly imparted from multiple directions, and therefore the cleaning effect can be further enhanced.

FIG. 4 is a front view, FIG. 5 is a right side view of FIG. 4, and FIG. 6 is a view taken in the direction of the arrow Y. The work support tools 2c and 2d include arms 21a, on which racks 22a and 22b are mounted. Two
It is attached to the lower end of 1b (see FIGS. 1 to 3). That is, in the work support tools 2c and 2d, the free roller 42 and the drive roller 43, which are rotatably mounted on the bracket 41, constitute the work receiver 44, and the drive roller 4
The pinion 45 is attached to 3. The bracket 4
1 includes arms 21 a and 21 via a connecting bracket 46.
b.

On the other hand, the legs 12a, 12 of the device frame 11
A rack bracket 47 is attached to b, two fixed racks 48 are suspended in each of them, and the above-mentioned pinion 45 is meshed with the rack 48. The work receiver 44 composed of the free roller 42 and the drive roller 43 is similarly attached to the right side portion omitted in FIG. 5, and thus eight work receivers 44 are formed.

Thus, by vertically reciprocating the work supports 2c and 2d in the cleaning liquid in the rectangular cleaning tank 3, the work 1 supported by the work receiver 44 can be rotated. The cavitation effect can be uniformly imparted from multiple directions, and the cleaning effect can be further enhanced.

The composite wave oscillator may be of a multi-wave type other than the above-mentioned triple wave, and the number of pairs of the composite wave oscillator and the ultrasonic transducer to be mounted may be appropriately set as necessary. You can choose.

Although not shown, the rectangular cleaning tank 3 is equipped with a device for regenerating a cleaning liquid contaminated (or deteriorated) by use to circulate a new cleaning liquid. It is composed of a thread film, a degassing film, a vacuum pump, a heat exchanger, and the like. Therefore, a cleaning liquid having a temperature and a liquid quality suitable for cleaning can be circulated, but as the cleaning liquid, a necessary one can be appropriately selected according to the cleaning conditions.

[0039]

As described above, according to the present invention, a cavitation effect can be imparted to a plurality of long work groups through a small number of ultrasonic transducer groups, and the work groups and ultrasonic waves can be applied. Cavitation action can be effectively imparted by moving the vibrator group and the vibrator group away from each other, and therefore, even if the device is configured in a large device, it is possible to prevent increase in device cost and power consumption and noise problems. It is also possible to prevent the occurrence of noise, and at that time, since the ultrasonic transducer group is driven by the synthetic wave oscillator, it is possible to prevent uneven sound pressure distribution in the cleaning liquid and to perform uniform cleaning. it can.

[Brief description of drawings]

FIG. 1 is a front view of an ultrasonic cleaning device.

FIG. 2 is a plan view of FIG.

3 is a Z arrow view of FIG. 1. FIG.

FIG. 4 is a front view showing another aspect of the work support tool.

FIG. 5 is a right side view of FIG.

FIG. 6 is a view on arrow Y of FIG.

FIG. 7 is a diagram showing sound pressure measurement points.

FIG. 8 is a diagram showing a sound pressure distribution at P1 when a synthetic wave oscillator is used.

FIG. 9 is a diagram showing a sound pressure distribution at P2 when a synthetic wave oscillator is used.

FIG. 10 is a diagram showing a sound pressure distribution at P3 when a synthetic wave oscillator is used.

FIG. 11 is a diagram showing a sound pressure distribution at P4 when a synthetic wave oscillator is used.

FIG. 12 is a diagram showing a sound pressure distribution at P5 when a synthetic wave oscillator is used.

FIG. 13 is a diagram showing a sound pressure distribution when a 25 KHz non-synthetic single wave oscillator is used.

FIG. 14 is a diagram showing a sound pressure distribution when a 50 KHz non-synthetic single wave oscillator is used.

FIG. 15 is a diagram showing a sound pressure distribution when a 75 KHz non-synthetic single wave oscillator is used.

[Explanation of symbols]

 1 Work 2a-2d Work support 3 Rectangular cleaning tank 4 Support lifting device 5 Transducer base 6 Transducer moving device 7a, 7b Work receiving 8 Ultrasonic transducer 40a, 40b Synthetic wave oscillator

Continuation of the front page (72) Inventor Soji Aoki 3-4-18 Nakanoshima, Kita-ku, Osaka-shi, Osaka (Mitsui Building No. 2 Building) Toray Engineering Co., Ltd.

Claims (2)

[Claims] 1. A rectangular cleaning tank to which a cleaning liquid is supplied, and a plurality of work receivers mounted at predetermined intervals in a direction orthogonal to the longitudinal direction of the cleaning tank, and the cleaning so as to face each other. A pair of work supports arranged at predetermined intervals in the longitudinal direction of the tank and the pair of work supports can be moved up and down together so as to be taken in and out of the cleaning tank, and together with the cleaning solution in the tank. And a support elevating device capable of reciprocating vertically, and a plurality of superpositions located in the tank below the work support moved into the cleaning solution in the tank and in a direction orthogonal to the longitudinal direction of the cleaning tank. A vibrator base having acoustic wave vibrators mounted at predetermined intervals, a vibrator moving device that reciprocates the vibrator base in the longitudinal direction of the cleaning tank, and a synthetic wave oscillator that drives the ultrasonic vibrator are provided. To be An ultrasonic cleaning device. 2. The ultrasonic cleaning device according to claim 1, wherein the composite wave oscillator is capable of oscillating a composite wave of a fundamental wave and two kinds of weighted waves.