JP4853811B2 - Cleaning device for planar parts - Google Patents

Description

  The present invention relates to a cleaning device for planar shaped parts such as a silk screen plate, a metal plate, a punching panel, a glass substrate, an electronic component mounting printed wiring board, etc., and more particularly to clean these planar shaped components more efficiently by ultrasonic waves. The present invention relates to a cleaning device for planar parts intended for the purpose.

  FIG. 6 shows a side sectional view of a conventional apparatus for cleaning planar parts such as silk screen plates by ultrasonic waves. As shown in FIG. 6, the ultrasonic transducer 64 is attached to the lower surface of the cleaning tank 61, the cleaning liquid 63 is filled in the tank, and the planar part 62, which is the object to be cleaned, is disposed therein. The vibrator 64 is vibrated, the cleaning liquid 63 in contact therewith is also vibrated, and the cleaning liquid 63 around the planar component 62 is vibrated. Further, the vibration is reflected against the cleaning liquid surface 65 and the cleaning liquid 63 vibrates in a complicated manner. Unnecessary substances such as dust, ink, solder, oil, etc. adhering to the planar shaped part 62 are removed and washed by the vibration. Of course, the output and frequency of the ultrasonic vibrator are adjusted and set considering the cleaning power and efficiency. ing.

Also, in such a cleaning device, dirt is often removed by not disturbing the sound field of standing waves by ultrasonic waves, but in order to prevent parts that can be washed by standing waves and parts that are not Measures are taken. For example, in Patent Document 1, the position of the standing wave is changed by moving the position of the reflection plate provided in the cleaning tank, thereby preventing cleaning unevenness.
JP-A-6-333906

  However, as a problem of the conventional configuration shown in FIG. 6, there is a great difference in cleaning efficiency depending on the water depth h1 (usually several tens of centimeters) of the cleaning liquid and the cleaning depth position h2 of the planar part. Naturally, the greater the water depth h1, the greater the amount of cleaning liquid that is moved by vibration and the greater the power required, so the efficiency will naturally deteriorate. In addition, the vibration of the vibrator is more efficiently transmitted to the washing liquid in the vicinity of the vibrator. However, the vibration decreases as the distance increases, and the cleaning efficiency decreases logarithmically near the upper surface of the cleaning liquid. Considering the reflected wave, since the ultrasonic wave is reflected by the cleaning liquid surface 65 and the vibration is transmitted in the direction of the vibrator, the reflected vibration becomes small when the water depth h1 of the cleaning liquid is large (deep), and the force for cleaning the component is weak. Become. For this reason, there has been a cleaning device that is provided with a reflector 66 to improve the cleaning power partially.

  In this configuration, in order to perform cleaning more efficiently, it is assumed that the cleaning part depth h2 of the planar shaped part is made as small as possible and the cleaning liquid depth h1 is about twice as large as h2, so that the cleaning seems to be good. Is done. However, when considering a cleaning device for cleaning a large number of parts, it is difficult and difficult to adjust each time, and it is impossible to adjust the dimensions to match the object to be cleaned each time. The current situation is that they are washed as they are.

  Further, in the method shown in Patent Document 1, since the reflecting plate provided in the cleaning tank is moved, the cleaning tank itself becomes large and requires a large amount of cleaning liquid, and therefore the capacity of the driving device needs to be increased. There was a problem that cleaning efficiency was poor.

  An object of the present invention is to solve such a conventional problem, and to provide a planar-shaped component cleaning apparatus that can clean a planar-shaped component efficiently with a very small amount of ultrasonic waves, which may require a small amount of cleaning liquid.

  In order to cope with the above-described object, the planar part cleaning apparatus of the present invention is composed of a total of six opposing surfaces that can accommodate the planar part, and has a substantially rectangular shape. The cleaning tank includes a cleaning tank having a drain port for discharging the cleaning liquid downward through an opening for supplying the cleaning liquid, and an ultrasonic vibrator attached to the cleaning tank. An ultrasonic transducer is attached to one or both of a pair of facing surfaces facing each other at the shortest distance, and the distance from the other one of the pair of facing surfaces facing at the shortest distance can be changed. It is characterized by comprising.

  In this configuration, the one surface slides liquid-tightly with respect to the other two sets of opposing surfaces in order to change the distance of the one set of opposing surfaces facing each other at the shortest distance of the cleaning tank. In order to change the distance of one set of facing surfaces facing each other at the shortest distance of the cleaning tank to the other of the surfaces of the cleaning tank, the other surface is adjacent to the other by an extendable member. It can be set as the structure connected to two sets of opposing surfaces.

  Further, in these configurations, at least one of a pair of facing surfaces facing each other at the shortest distance of the cleaning tank may be configured to protrude according to the shape of the object to be cleaned.

  With the above configuration, the amount of cleaning liquid can be reduced, the load on the ultrasonic vibrator is small, the distance between the ultrasonic vibrator and the object to be cleaned can be made extremely close, and the ultrasonic transmission loss can be minimized. Since the outside is air, an effect that the loss that becomes a load of the ultrasonic transducer can be reduced can be obtained.

(Embodiment 1)
Hereinafter, the planar shape component cleaning apparatus according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 5 is an explanatory diagram showing the basic concept of the present invention. In the following, based on FIG. 5, it is preferable that the cleaning tank 1 for storing a planar shaped part such as a silk screen plate be as small as possible in terms of space, the amount of cleaning liquid, and the cleaning power. Therefore, it is desirable to have a similar rectangular shape that can accommodate the planar component 2, and the surfaces f 1 (1) (front) and f 1 (2) (parallel to the plane of the planar component to be cleaned) The back surface is opposed with a dimension s, and the surface f2 (1) (right side surface) and the surface f2 (2) (left side surface), which are one of the surfaces corresponding to the outer shape of the planar part, are opposed with the dimension a, and the rest The face f3 (1) (top face) and the face f3 (2) (bottom face) are opposed to each other with a dimension b to form a rectangular parallelepiped with six faces in total.

  Here, in order to give as much vibration as possible to the planar component 2 through the cleaning liquid, the front surface f1 (1) and the rear surface f1 (2) which constitute the surface with the shortest facing dimension s of the facing distance among the above six surfaces. ) It is preferable to attach an ultrasonic transducer to either or both surfaces.

  FIG. 1 is a side sectional view showing a planar-shaped component cleaning apparatus according to Embodiment 1 of the present invention, and more specifically shows FIG. In FIG. 1, the first feature is that a substantially rectangular cleaning tank 1 composed of three opposing faces (total of six faces) that can accommodate a planar shaped part 2 to be cleaned is provided. F1 that face each other at a distance s1 that is substantially parallel to the plane of the planar part to be cleaned and has the shortest distance s1 (actual dimension is set to be extremely small from several mm to several cm). An ultrasonic vibrator is attached to either one or both of (1) and f1 (2), and the ultrasonic vibrator 4 is vibrated after the rectangular cleaning tank 1 is filled with the cleaning liquid 3. And wash. Further, a drain port 5 is provided below the rectangular cleaning tank 1 to discharge the cleaning liquid after cleaning, and a tank 6 which is a cleaning liquid purifier is installed below the discharge port 5. Is retained, and a residue which is an unnecessary solid matter in the cleaning liquid, actually, ink residue, solder residue and the like is precipitated. Further, impurities in the cleaning liquid are filtered through the filter 7, and the cleaning liquid is supplied from the opening 9 opened above the rectangular cleaning tank 1 by the pump 8. A clean cleaning liquid is always supplied from the opening 9 and at the same time, the dirty cleaning liquid is always discharged from the lower drain port 5. At the same time, in order to always fill the inside of the rectangular cleaning tank 1 with the cleaning liquid, there is provided a cleaning liquid level management means configured to control and rotate the pump 8 by the liquid level sensor 10 and the control circuit 11 shown in FIG.

  When the amount of the cleaning liquid in the cleaning tank 1 at the start is insufficient, the pump 8 is fully operated to supply the cleaning liquid 3 until the cleaning liquid 3 is filled in the cleaning tank 1. The cleaning liquid equivalent amount discharged from the opening is supplied by controlling the rotation speed of the pump 8, and the cleaning tank 1 is always filled with the clean cleaning liquid 3, and the dirty cleaning liquid 3 is discharged from the lower drain port 5, The residue 6a is dropped into the tank 6.

  Next, as a second feature of the present embodiment, opposed surface sliding means is provided. Of the surfaces f1 (1) and f1 (2) facing each other at the shortest distance, here, the movable wall plate 1a, which is the surface f1 (2) that hits the back surface, has rubber packings 12 shown in the figure on the four sides on the top, bottom, left and right. The cleaning tank 1 is liquid-tight. Then, a slide screw 14 is provided which is fixed to a slide mechanism fixing bar 13 attached to the cleaning tank 1 and screwed into a bearing metal 13a threaded on the inner surface, and one end of the slide screw 14 is rotated to the movable wall plate 1a. A handle 15 is provided at the other end, and the other end is provided with a handle 15. By rotating the handle 15, the movable wall plate 1a is supported by the rubber packing 12 on the surfaces f2 (1), f2 (2), f3 (1), f3 (2). In contrast, the distance between the surface f1 (1) and the surface f1 (1) can be varied. Then, the distance between the surface f1 (1) and the surface f1 (2) is adjusted while preventing the liquid in the cleaning tank 1 from leaking by the rubber packing 12, and the frequency of the ultrasonic transducer 4 is adjusted by the control circuit 11. Thus, the planar shaped part 2 can be cleaned with a minimum ultrasonic output.

  The plane-shaped component 2 that is the object to be cleaned may be taken in and out by moving the surface f1 (2) to the left in the figure by operating the handle 15.

  Here, compared to the conventional example, the distance s2 between the surface f1 (1) and the planar part 2 and the distance s3 between the planar part 2 and the surface f1 (2) (movable wall plate 1a) are several millimeters to several centimeters. Set. Accordingly, the size is approximately one-tenth that of the conventional one, so that ultrasonic vibration is easily transmitted to the planar component 2 that is the component to be cleaned, and even if the output of the vibrator 4 is small, it is sufficient for the component to be cleaned. Vibration energy can be transmitted and cleaning efficiency is good. For reference, if the frame portion of the plate is inflated with the surface of the washing tank and the dimensions s2 and s3 in the silk screen portion are set to about 5 mm, a large detergency can be obtained with a small output.

As a result, the following remarkable effects can be obtained.
(1) The amount of cleaning liquid to be vibrated by ultrasonic waves is extremely small compared to the conventional case. That is, the load on the ultrasonic transducer can be small.
(2) The distance between the ultrasonic transducer and the object to be cleaned is made extremely close to minimize transmission loss.
(3) The outside of the cleaning tank in the present embodiment is air (inside is liquid), and even when compared with a reflection plate (both sides are liquid because it is immersed) used in the conventional cleaning liquid, air Since the mass is smaller than that of the liquid, there is little loss as a load on the ultrasonic transducer.

  Thus, the configuration of the cleaning tank of the present invention can exhibit the maximum cleaning power even with a small ultrasonic output. In other words, a large vibration can be given to the cleaning liquid even with normal ultrasonic output. The best form of cleaning with ultrasonic waves is that the cleaning liquid is vibrated by ultrasonic vibration, and by applying strong ultrasonic vibration, cavitation occurs in the cleaning liquid, and the negative pressure forming part is broken by high-speed shearing and microscopic. When a bubble is generated and the microbubble instantly crushes and breaks down, it is assumed that the energy is released and thereby the best cleaning is possible.

  Since there is no sensor or the like that constantly senses the occurrence state of the microbubbles, the present invention correlates by the following method and controls the generation of microbubbles in the result.

  That is, it is necessary to adjust the output and frequency of the ultrasonic vibrator and the distances such as s1, s2, and s3 so that the cleaning power is maximized (the amount of generated microbubbles is large). The aluminum foil drilling test is conducted under each condition for evaluation.

  Specifically, an aluminum foil is attached to a portion to be cleaned, particularly where cleaning is required, and the state is put in the apparatus of this embodiment, and the cleaning power is tested under certain conditions. Next, the state of the aluminum foil of the object to be cleaned taken out is examined, and a state where small holes are opened in the aluminum foil as uniformly as possible is regarded as good cleaning condition. As described above, the ultrasonic vibration is sufficiently transmitted to the object to be cleaned, cleaned, and the cleaning liquid is vibrated more strongly to cause cavitation, where microbubbles are generated, and when it is rapidly contracted and destroyed, Since it can be estimated that a hole will open in the aluminum foil, this is used as a guide.

  Although it has been described that the rotation of the slide screw 14 is schematically rotated by the handle 15, it may be rotated by a motor (not shown) via a reduction gear or directly. The facing surface sliding means is not limited to that shown here, and a conventionally known moving means may be used.

  Although the case where the cleaning tank 1 is vertical is shown here, this may be inclined, and the cleaning tank may be placed horizontally if the shape of the opening 9 is devised.

  FIG. 2 is a side cross-sectional view when the cleaning tank 1 of FIG. 1 is placed horizontally, and the same reference numerals are given to portions having the same functions as those in FIG. This is achieved by slightly changing the positions of the drain port 5 and the opening 9 as compared with FIG. The means for sliding the surface f1 (2) is omitted because it is the same as in FIG.

(Embodiment 2)
FIG. 3 is a side sectional view showing a planar part cleaning apparatus according to Embodiment 2 of the present invention. The difference from FIG. 1 is the shape of the movable wall surface 1b of the cleaning tank 1, and the planar part 2a includes a peripheral part. There is a plate frame 2b, and the movable wall surface 1b is characterized in that the center portion protrudes so as to approach the metal plate portion 2c while avoiding the plate frame 2b. Other parts having the same functions as those in FIG.

  By constituting in this way, the movable wall surface 1b is very close to the metal plate portion 2c while avoiding a part of the thick plate frame partially, so that the internal volume of the cleaning tank 1 is small and the amount of cleaning liquid can be further reduced. The ultrasonic vibration energy by the ultrasonic vibrator 4 is effectively transmitted to the metal plate portion 2c, the load on the ultrasonic vibrator 4 is further reduced, and the transmission loss can be reduced.

  Although the movable wall surface 1b is protruded here, depending on the shape of the planar part 2a, the surface of the cleaning tank 1 facing the movable wall surface 1b may be protruded, or both surfaces may be protruded little by little. .

(Embodiment 3)
FIG. 4 is a side sectional view showing a planar-shaped component cleaning apparatus according to Embodiment 3 of the present invention. The difference from FIG. 1 is that the periphery of the movable wall plate 1c is not a packing but a bellows-like metal thin film that can be expanded and contracted. Or a film 16 of rubber, plastic or the like, connected to the surfaces f2 (1), f2 (2), f3 (1), f3 (2) of the cleaning tank 1 as shown in FIG. 1c is configured to be easily moved in the left-right direction in the figure by the rotation of the slide screw 14 and the cleaning liquid 3 is not leaked.

  Here, the bellows-like film 16 has a structure in which bending is overlapped in the left-right direction in the figure. However, the movable wall plate 1c can be moved back and forth by concentrating folds in four directions around the movable wall plate 1c. Also good. Other parts having the same functions as those in FIG. The effect of the configuration of FIG. 4 is the same as that of FIG. 1, and this configuration may be applied to the second embodiment of FIG.

  The present invention can reduce the amount of cleaning liquid with a simple configuration, reduce the load on the ultrasonic transducer, and minimize the transmission loss of ultrasonic waves by extremely reducing the distance between the ultrasonic transducer and the object to be cleaned. Since the outside of the cleaning tank is air, there is little loss as a load on the ultrasonic vibrator, and the industrial applicability is high that the maximum cleaning power can be exhibited with a small ultrasonic output.

Sectional drawing which shows the washing | cleaning apparatus of the planar shape components in Embodiment 1 of this invention Similarly, the sectional side view which shows the washing | cleaning apparatus of the other planar shape components in Embodiment 1. Similarly, the sectional side view which shows the washing | cleaning apparatus of the planar shaped component in Embodiment 2. FIG. 5 is a side sectional view showing a cleaning apparatus for planar parts in the third embodiment. Explanatory drawing showing the basic concept of the present invention Cross-sectional side view of a conventional flat part cleaning device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cleaning tank 1a * 1b * 1c Movable wall surface 2 * 2a Planar shape part 3 Cleaning liquid 4 Ultrasonic vibrator 5 Drain port 6 Tank 7 Filter 8 Pump 9 Opening part 10 Liquid level sensor 11 Control circuit 12 Rubber packing 13 Slide mechanism fixed bar 13a Bearing metal 14 Slide screw 15 Handle 16 Membrane

Claims (6)

Consists of a total of six opposing faces that can accommodate planar parts, and is substantially rectangular, with the interior filled with cleaning liquid and an upper opening for supplying the cleaning liquid, and a drain port for discharging the cleaning liquid downward. A cleaning tank having,
An ultrasonic vibrator attached to the cleaning tank,
The cleaning tank has an ultrasonic vibrator attached to one or both of a pair of facing surfaces facing each other at the shortest distance among the three pairs of facing surfaces, and one of the pair of facing surfaces facing each other at the shortest distance. A planar shaped component cleaning apparatus, characterized in that the interval with respect to the other of one side can be changed. In order to change the distance of one set of facing surfaces facing each other at the shortest distance of the cleaning tank, the one surface is configured to slide liquid-tightly with respect to the other two sets of facing surfaces. The planar-shaped component cleaning apparatus according to claim 1. A configuration in which one surface of the pair of facing surfaces facing each other at the shortest distance of the cleaning tank is connected to the other two facing surfaces adjacent to each other by an extendable member in order to change the distance between the surfaces. The planar part washing | cleaning apparatus of Claim 1 characterized by the above-mentioned. The planar part cleaning according to any one of claims 1 to 3, wherein at least one of a pair of opposing surfaces facing each other at the shortest distance of the cleaning tank protrudes in accordance with the shape of the object to be cleaned. apparatus. The planar shaped component cleaning apparatus according to any one of claims 1 to 4, further comprising a cleaning liquid level control means for always filling the cleaning tank with a cleaning liquid. The planar shaped component cleaning apparatus according to any one of claims 1 to 4, further comprising an output adjusting device that adjusts the power applied to the ultrasonic transducer and the frequency thereof.

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