JPH06179989A - Cleaning device - Google Patents

Abstract

PURPOSE:To allow the contaminant in a cleaning soln. to overflow and to maintain the detergency of the soln. at the time of cleaning a metallic material with the soln. circulated by bubbles by generating more bubbles at the center of a cleaning tank than at the periphery. CONSTITUTION:A metallic member with dust and oil deposited on the surface is placed in a cleaning tank 2 contg. a cleaning soln. and in which an air pipe 22 having more exhaust ports is arranged at the center of the bottom and an air pipe 23 having fewer exhaust ports at the periphery, and compressed air is supplied to the pipes 22 and 23 from a header 3. Air bubbles are injected into the cleaning soln. from the pipes 22 and 23, hence the soln. is circulated in the tank 2, and the dust and oil on the metallic member surface are removed. In this case, since more bubbles are generated at the center than at the periphery, the dust, etc., are moved from the center to periphery, and pushed up at the periphery, the dust and oil floating on the surface overflows into the upper peripheral trough 21 of the tank 2 and are removed from the soln., and the soln. freed from the dust, etc., is repeatedly used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning apparatus for cleaning a work after heat treatment by immersing it in a dipping 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, the work may be washed by immersing the work in a dipping tank filled with the cleaning liquid. In this case, the cleaning liquid in contact with the surface of the work is always exchanged and it is necessary to stir the cleaning liquid in order to improve the cleaning effect. is there. 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. As such a cleaning device, for example, according to Japanese Patent Laid-Open No. 2-268879, a nozzle for generating bubbles is provided in the center of the inner bottom of the dipping tank, the cleaning liquid is stirred by the bubbles from the nozzle, and the surface of the cleaning liquid floats. There is known a structure in which such dirt is caused to flow radially toward the peripheral edge portion to overflow, so that dirt floating on the surface of the cleaning liquid does not reattach to the work when the work is pulled up from the dipping tank.

[0003]

SUMMARY OF THE INVENTION In the above conventional one,
The cleaning liquid rises in the central part of the dipping tank together with air bubbles, flows radially toward the peripheral part on the surface of the cleaning liquid, then descends along the peripheral wall of the dipping tank, and further flows from the peripheral part to the central part at the bottom, and is immersed. Convection occurs in the tank. When such convection occurs, the dirt floating on the surface of the cleaning liquid overflows from the peripheral edge of the dipping tank and is discharged, but the dirt floating in the cleaning liquid is immersed in the convection of the cleaning liquid even if it rises near the surface of the cleaning liquid. Since it descends along the peripheral wall of the tank, it is not effectively discharged from the dipping tank, and the contamination of the cleaning liquid progresses.

Therefore, in order to solve the above-mentioned problems, it is an object of the present invention to provide a cleaning device capable of effectively discharging not only dirt floating on the surface of the cleaning solution but also dirt floating in the cleaning solution from the immersion tank. .

[0005]

In order to achieve the above object, the present invention is an apparatus for immersing a work in an immersion tank and cleaning the work while overflowing the cleaning liquid from the periphery of the immersion tank. Nozzles for generating bubbles are provided in the central portion and the peripheral portion of the inner bottom portion of the device, and the amount of bubble generation from the nozzle in the central portion is larger than the amount of bubble generation from the nozzles in the peripheral portion. .

[0006]

Since the amount of bubbles generated in the central portion is larger than the amount of bubbles generated in the peripheral portion, a radial flow is generated on the surface of the cleaning liquid from the central portion to the peripheral portion, and the dirt floating on the surface of the cleaning liquid is generated. Is overflowed from the periphery of the immersion tank and discharged from the immersion tank. Further, the dirt floating in the cleaning liquid rides on the flow of bubbles in the central portion, rises to near the surface of the cleaning liquid, and moves to the peripheral portion as it is. However, the bubbles from the nozzles provided at the inner bottom edge of the dipping tank block the flow of the cleaning liquid that is trying to descend along the peripheral wall of the dipping tank, which causes dirt floating in the cleaning liquid to descend in the dipping tank. Without being carried out, it is overflowed and discharged from the peripheral portion of the immersion tank.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 is a cleaning device, and inside the cleaning device 1, an elevating frame 12 which is moved up and down along a guide rail 13 by an elevating cylinder 11 is provided.
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 so that the work W is After cleaning, the pallet P is pulled up together with the elevating frame 12, and the jet nozzle of the pipe 15 and the pallet P attached to the elevating frame 12 so as to be rotatable around the vertical axis.
The cleaning liquid is sprayed onto the work W from the spray nozzle of the moving pipe 16 that reciprocates below the work W to rinse the work, and the pallet P is discharged from the cleaning device 1.

By the way, in the case of 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.

As shown in FIG. 2, an air supply pipe 22 is arranged at the center of the bottom of the immersion tank 2 and an air supply pipe 23 is arranged at the periphery thereof. Two
Both 2 and 23 are branched from the main pipe 3 connected to the compressor. A nozzle (not shown) for generating air bubbles is attached to each of the air supply pipes 22 and 23, and the number of nozzles per unit length is determined by the air supply pipe 22. I set it to be more. Although not shown, a cleaning liquid is constantly supplied to the immersion tank 2 by a pump, and the cleaning liquid overflowed by the pump is collected by a gutter 21 provided on the outer periphery of the immersion tank 2 and returned to the cleaning liquid tank. After the dirt was separated from the cleaning solution, this cleaning liquid was supplied again to the immersion tank 2.

According to the above construction, when the pallet P carrying the work W descends together with the elevating frame 12 and is immersed in the dipping tank 2, the air from the compressor is fed from the main pipe 3 to both air supply pipes 22 and 23. The air is sent under pressure, and bubbles are generated from the nozzles of both air supply pipes 22 and 23. At this time, since the number of nozzles per unit length is set to be larger in the air supply pipe 22, the amount of air bubbles generated in the central portion is larger than the amount of air bubbles generated in the peripheral portion, and thus the air supply pipe 22. The dirt rising together with the bubbles from the nozzle of 22 flows toward the peripheral edge on the upper surface of the cleaning liquid and its vicinity. Then, the dirt floating on the surface of the cleaning liquid overflows into the gutter 21 together with the cleaning liquid. On the other hand, dirt floating around the cleaning liquid is prevented from falling along the peripheral wall of the dipping tank 2 by bubbles from the nozzle of the air supply pipe 23, and overflows into the gutter 21 together with the cleaning liquid.

In the above embodiment, both air supply pipes 22 and 23 are connected to one main pipe 3 and the number of nozzles of both air supply pipes 22 and 23 per unit length is different. Air is supplied to the air pipe 22 and the air supply pipe 23 by different systems,
By making the supply pressure on the air supply pipe 22 side higher than the supply pressure on the air supply pipe 23 side, the amount of bubbles generated in the central portion may be larger than that in the peripheral portion.

[0012]

As is apparent from the above description, according to the present invention, when the work is immersed in the immersion tank and cleaned,
In addition to dirt floating on the surface of the cleaning liquid, dirt floating in the cleaning liquid can be effectively overflowed from the dipping tank and discharged.

[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 3 Main pipe 11 Elevating cylinder 12 Elevating frame 22 Air supply pipe 23 (arranged in the central part) Air supply pipe (arranged in the peripheral part) P Pallet W Work

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadao Sugano 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd.

Claims (1)

[Claims] 1. An apparatus for cleaning a work by immersing the work in the dipping tank and overflowing a cleaning liquid from the periphery of the dipping tank, wherein a nozzle for generating bubbles in a central portion and a peripheral portion of an inner bottom portion of the dipping tank is provided. A cleaning device, wherein the cleaning device is provided so that the amount of bubbles generated from the nozzle in the central portion is larger than the amount of bubbles generated from the nozzle in the peripheral portion.