JPH06179991A - Device and method for cleaning - Google Patents

Abstract

PURPOSE:To clean a work by adsorbing the contaminant on the work surface with the fine bubbles reaching the minute part on the work surface, agitating a cleaning soln. by the relatively large bubble generated thereafter, detaching the fine bubble having adsorbed the contaminant from the water surface, moving the contaminant onto the soln. surface and allowing the contaminant to overflow into a trough along with the soln. CONSTITUTION:An air feed pipe 22 for generating a relatively large bubble capable of agitating a cleaning soln. and an air feed pipe 23 for generating a fine bubble are provided at the bottom of a dipping tank 2 having a trough 21 at its periphery and filled with the soln. The work W is lowered and dipped in the tank 2, the fine bubble is firstly generated, and then the relatively large bubble is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning apparatus and a cleaning method for cleaning a work after heat treatment by immersing it in an immersion tank filled with a cleaning liquid.

[0002]

2. Description of the Related Art For example, dust and oil used in a heat treatment process adhere to the surface of a work after heat treatment,
Therefore, it is necessary to clean the surface of the work after the heat treatment. In such a case, in addition to spraying the cleaning liquid onto the surface of the work, the work may be cleaned by immersing the work in an immersion tank filled with the cleaning liquid. When the work is immersed in the dipping tank for cleaning in this way, it is necessary to stir the cleaning liquid in order to constantly exchange the cleaning liquid in contact with the surface of the work and improve the cleaning effect. Therefore, it has been conventionally practiced to provide a nozzle at the inner bottom of the immersion tank, generate bubbles from the nozzle, and stir the cleaning liquid by the rise of the bubbles.

[0003]

SUMMARY OF THE INVENTION In the above conventional one,
If the work has a portion such as a recessed portion where air bubbles are hard to reach, the cleaning liquid in this portion cannot be sufficiently exchanged by stirring with the air bubbles, so that the cleaning effect cannot be enhanced.

As described in JP-A-2-293078, if fine bubbles are generated in the cleaning liquid, the fine bubbles can reach deep inside the recessed portion to adsorb dirt to the fine bubbles. However, since the fine bubbles have small buoyancy, the fine bubbles that have adsorbed the dirt stay in the vicinity of the work surface and prevent new fine bubbles from approaching the work surface. May be attached.

In view of the above, the present invention provides a cleaning apparatus and a cleaning method capable of sufficiently cleaning the details of a work when cleaning the work using an immersion tank in order to solve the above problems. With the goal.

[0006]

In order to achieve the above object, the invention of claim 1 is an apparatus for cleaning a work by immersing a workpiece in an immersion tank filled with a cleaning liquid, wherein an inner bottom portion of the immersion tank is provided. A first nozzle for generating fine bubbles and a second nozzle for generating bubbles of a size capable of stirring the cleaning liquid are arranged in parallel, and an air supply means for individually feeding air to both nozzles is provided. Characterize.

The invention of claim 2 is a method of immersing a workpiece in an immersion tank filled with a cleaning liquid for cleaning, in which bubbles are sized so that fine bubbles and the cleaning liquid can be agitated from the inner bottom of the immersion tank. And is generated alternately.

[0008]

When the work is dipped in the dipping tank, first, fine bubbles are generated, and the fine bubbles reach the details of the work to adsorb the dirt. Next, generate bubbles of a size that can stir the cleaning liquid, separate the fine bubbles that have adsorbed dirt from the work surface by stirring the entire cleaning liquid, and further grow by colliding and coalescing the fine bubbles. Fine bubbles are taken into the bubbles for stirring, and the dirt adsorbed by the fine bubbles is moved to the surface of the cleaning liquid.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a cleaning device 1 is provided with an elevating frame 12 which is moved up and down by a lifting cylinder 11 along a guide rail 13 in the cleaning device 1. When a pallet P having a large number of works W mounted thereon is conveyed on a guide rail 14 provided at the bottom of the elevating frame 12, the elevating frame 12 is lowered, and the elevating frame 12 is immersed in the dipping tank 2 and washed. The pallet P is pulled up together with the elevating frame 12, and the cleaning liquid is supplied from the ejection nozzle of the pipe 15 rotatably attached to the elevating frame 12 around the vertical axis and the ejection nozzle of the moving pipe 16 that reciprocates below the pallet P. The work W was sprayed to rinse the work, and the pallet P was discharged from the cleaning device 1.

In the present embodiment, the work W is a counter shaft used in an automatic transmission,
Further, the pallet P has a base plate PL having the same number of openings PH as the number of works W to be placed and a guide frame PU in the shape of a cross girder at the four corners and the central five places, respectively, via the connecting rods PB. It is a connection. In addition, at least three support protrusions P are evenly spaced from each other on the upper surface of the peripheral edge of the opening PH.
S is erected, and the side surface of the gear portion WG provided on one side peripheral surface of the work W is supported by the support protrusion PS, so that the bottomed deep hole portion WH is opened downward.

At the bottom of the immersion tank 2, two systems of air supply pipes 22 and 23 are arranged, and one of the air supply pipes 22 is provided.
A plurality of nozzles that generate relatively large bubbles that can stir the cleaning liquid in the dipping tank 2 are arranged side by side. Further, the other air supply pipe 23 has fine bubbles (for example, a bubble diameter of 0.1 μm).
m-3 μm) was used to form the sintered pipe.
Then, the main pipe 4 connected to the compressor was connected to the air supply pipe 22 via the switching valve 41, and was connected to the air supply pipe 23 via the switching valve 42 and the booster pump 43.

According to the above construction, when the pallet P on which the work W is mounted descends together with the elevating frame 12 and is immersed in the dipping tank 2, first, the air is sent under pressure to the air supply pipe 23, and the fine air is supplied from the air supply pipe 23. Generate bubbles. As a result, the entire inside of the immersion tank 2 is filled with fine bubbles, and every part of the work W,
For example, fine bubbles reach the inside of the deep hole portion WH or the tooth bottom of the gear portion WG to adsorb dirt and the like on the surface of the work W. When the fine bubbles are generated for a predetermined time, the relatively large bubbles are then generated from the nozzle of the air supply pipe 22 to stir the cleaning liquid and the fine bubbles remaining on the surface of the work W are removed.
The dirt adsorbed by the fine bubbles is moved to the surface of the cleaning liquid while growing the fine bubbles, and overflows together with the cleaning liquid into the gutter 21 provided around the dipping tank 2.
When relatively large bubbles are generated from the nozzle of the air supply pipe 22, the generation of fine bubbles from the air supply pipe 23 may be stopped or continued. Then, after immersion cleaning for a predetermined time, the work W is pulled up together with the elevating frame 12 and rinsed as described above, and the cleaning of the work W is completed.

By the way, in the above embodiment, the air supply to the air supply pipes 22 and 23 was switched once, but this may be repeated several times.

[0014]

As is clear from the above description, according to the present invention, when the work is immersed in the immersion tank for cleaning,
Even if the work has a recessed portion or the like that is difficult to clean, it is possible to sufficiently clean the details inside the recessed portion.

[Brief description of drawings]

FIG. 1 is a front view showing the configuration of a cleaning device to which the present invention is applied.

FIG. 2 II-II sectional view

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cleaning device 2 Immersion tank 4 Main pipe 11 Elevating cylinder 12 Elevating frame 22 Air supply pipe 23 Air supply pipe 43 Booster pump P Pallet W Work

Claims (2)

[Claims] 1. An apparatus for cleaning a work by immersing a workpiece in a dipping tank filled with a cleaning liquid, wherein a first nozzle for generating fine bubbles and an air bubble having a size capable of stirring the cleaning liquid are provided in an inner bottom portion of the dipping tank. A cleaning device characterized in that a second nozzle to be generated is arranged in parallel, and an air supply means for individually feeding air to both nozzles is provided. 2. A method of cleaning a work by immersing a work in a dipping tank filled with a cleaning liquid, wherein fine bubbles and bubbles having a size capable of stirring the cleaning liquid are alternately generated from an inner bottom portion of the dipping tank. A cleaning method characterized by: