JP2021112721A - Washing equipment - Google Patents

Abstract

To provide washing equipment capable of improving washing quality.SOLUTION: There is provided washing equipment 1 which stores an object W to be washed in a washing container 2, and in which washing fluid 3 is supplied for washing the object to be washed. The washing equipment comprises: a washing fluid supply channel 5 for supplying the washing fluid 3 into the washing container 2; and a washing fluid discharge channel 6 for discharging the washing fluid 3 in the washing container 2. The washing fluid supply channel 5 comprises an opening/closing valve 12 for switching supply/stop of the washing fluid 3 into the washing container 2. The washing fluid discharge channel 6 comprises suction means 19 capable of suctioning ambient air and the washing fluid 3 in the washing container 2. In the washing equipment, in a state where the opening/closing valve 12 is closed, supply of the washing fluid 3 into the washing container 2 is stopped and the suction means 19 sucks ambient air in the washing container 2 for generating a negative pressure state, the opening/closing valve 12 is opened and then the washing fluid 3 is supplied into the washing container 2, then in a state of supplying the washing fluid 3, the opening/closing valve 12 is closed and supply of the washing fluid is stopped and the washing fluid 3 in the washing container 2 is sucked by the suction means 19 and then is discharged to the washing fluid discharge channel 6.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cleaning device for cleaning machined parts and the like after processing.

In the automobile and electrical industries, "cleaning" plays an important role in the manufacturing process of parts. Here, "cleaning" of parts is performed to ensure the reliability of the product and the quality of the post-process, and refers to a process of removing stains adhering to the pre-process.
The cleaning methods are roughly classified into wet type and dry type, and can be further classified into chemical cleaning and physical cleaning.
Chemical cleaning, typified by alkaline cleaning and solvent cleaning, removes stains by dissolving and dispersing the cleaning agent, so it is highly effective against large amounts of stains and heavy stains, but it can be used for rinsing cleaning liquids and rinsing. Post-treatment such as draining and drying of the rinsing liquid is required, which increases the number of steps and the processing time, which may lead to an increase in equipment cost and energy.
On the other hand, physical cleaning represented by blow cleaning is positioned as a rational cleaning method because it wipes off dirt with a gas flow such as air and can be processed at high speed with a small number of steps. However, it is difficult to obtain high cleaning quality compared to chemical cleaning, and in order to remove dirt by locally concentrating the cleaning energy, a wide area or a part with a complicated shape is designated as the area to be cleaned. Then, a case that is difficult to apply occurs.
Therefore, as a cleaning method that combines the actions of chemical cleaning and the action of physical cleaning, as shown in FIG. 2, the object W to be cleaned is housed in the cleaning container 100, and the cleaning liquid is forcibly distributed there. Such cleaning methods (commonly known as flow velocity cleaning, direct path cleaning, etc.) have been conventionally known (see, for example, Patent Documents 1 to 3).
In the conventional cleaning device shown in FIG. 2, a box-shaped lower jig 100a having an open upper surface and an inverted box-shaped upper jig 100b having an open lower surface can be combined to accommodate the object to be cleaned W. Cleaning container 100, a liquid storage tank 101 capable of storing cleaning liquid, a cleaning liquid supply flow path 104 including a pipe 102 for supplying the cleaning liquid of the liquid storage tank 101 to the cleaning container 100, and a circulation pump 103, and cleaning. A cleaning liquid discharge flow path 105 including a single pipe for discharging the cleaning liquid in the container 100 to the liquid storage tank 101 is provided, and the circulation pump 103 is operated to forcibly flow the cleaning liquid into the cleaning container 100. The stains adhering to the object W to be cleaned are washed and removed by the chemical action and physical action of the cleaning liquid, and the cleaning liquid after cleaning is returned from the cleaning liquid discharge flow path 105 to the liquid storage tank 101 and circulated.

Japanese Unexamined Patent Publication No. 7-328565 Japanese Unexamined Patent Publication No. 8-332463 Japanese Unexamined Patent Publication No. 8-337890

In the above-mentioned conventional cleaning device, since the cleaning liquid passes through the cleaning container 100 in one direction for cleaning, there is a possibility that sufficient cleaning quality cannot be obtained depending on the shape of the object to be cleaned.
The present invention has been made in view of the above, and an object of the present invention is to provide a cleaning device capable of improving cleaning quality.

In order to achieve the above object, the present invention
A cleaning device in which an object to be cleaned is housed inside a cleaning container and a cleaning liquid is supplied into the cleaning container to clean the object to be cleaned.
A cleaning liquid supply flow path for supplying the cleaning liquid into the cleaning container,
It is provided with a cleaning liquid discharge flow path for discharging the cleaning liquid in the cleaning container.
The cleaning liquid supply flow path is provided with an on-off valve capable of switching between supply and stop of the cleaning liquid to the cleaning container.
On the other hand, the cleaning liquid discharge flow path is provided with a suction means capable of sucking the outside air in the cleaning container and the cleaning liquid.
The on-off valve is closed to stop the supply of the cleaning liquid into the cleaning container, and the outside air in the cleaning container is sucked by the suction means to create a negative pressure.
With the inside of the cleaning container under negative pressure, the on-off valve is opened to supply the cleaning liquid into the cleaning container.
Further, the on-off valve is closed to stop the supply of the cleaning liquid while the cleaning liquid is being supplied into the cleaning container, and the cleaning liquid in the cleaning container is sucked by the suction means and discharged to the cleaning liquid discharge flow path. The cleaning device is provided.

Further, as described in claim 2, the cleaning liquid supply flow path is opened and closed from the first liquid storage tank that can store the cleaning liquid to the second liquid storage tank that can also store the cleaning liquid, and further from the second liquid storage tank. It is designed to lead to the cleaning container via a valve.
On the other hand, the cleaning liquid discharge flow path leads from the cleaning container to the first liquid storage tank via the suction means.
Further, the cleaning apparatus according to claim 1, wherein the second storage tank is provided with a return flow path for returning excess cleaning liquid exceeding a predetermined storage amount to the first storage tank.

Further, as described in claim 3, the suction means has a circulation flow path for circulating the cleaning liquid of the first storage tank by a circulation pump, an inflow portion, an outflow portion, and a suction portion, and the inflow portion. The cleaning apparatus according to claim 1 or 2, further comprising an ejector having the outflow portion connected to the middle of the circulation flow path and connecting the cleaning liquid discharge flow path to the suction portion of the ejector. do.

Further, as described in claim 4, the second liquid storage tank is provided at a higher place than the washing container, and the cleaning liquid in the second liquid storage tank is weighted by its own weight with the on-off valve open. The cleaning apparatus according to any one of claims 1 to 3 is provided, wherein the liquid can flow into the cleaning container by the liquid dropping by the method and the suction action by the suction means.

According to the cleaning device of the present invention, the flow velocity of the cleaning liquid supplied by the negative pressure inside the cleaning container and the suction action by the suction means increases, and the cleaning liquid flows into the cleaning container in a turbulent state and is stored therein. Since the surface of the object to be cleaned is circulated all over, the adhering dirt can be efficiently removed. Further, since the cleaning liquid in the cleaning container is quickly discharged by the suction action of the suction means, the liquid to be cleaned can be drained in a short time. Therefore, it is possible to improve the cleaning quality and reduce the cleaning cost.

Further, according to the cleaning apparatus according to claim 2, excess cleaning liquid exceeding the predetermined storage amount of the second liquid storage tank is returned to the first liquid storage tank through the return flow path, so that the cleaning liquid supply flow The object to be cleaned can be cleaned simply by opening and closing the on-off valve while keeping the amount of liquid sent to the second liquid storage tank of the road constant. Therefore, it is not necessary to control the amount of liquid sent to the cleaning liquid supply flow path for each cleaning timing, so that the structure can be simplified and the operating cost and cleaning cost can be reduced.

Further, according to the cleaning device according to claim 3, the outside air in the cleaning container and the cleaning liquid can be sucked by the ejector connected in the middle of the circulation flow path, and the sucked cleaning liquid can be sucked from the ejector in the circulation flow path. Since it merges with the cleaning liquid that circulates and automatically returns to the first liquid storage tank, the structure is simple, the cost is low, and maintenance is easy.

Further, according to the cleaning device according to claim 4, the drop from the liquid level of the second liquid storage tank to the cleaning container, the negative pressure in the cleaning container due to the suction action of the suction means, and the continuous suction force. As a result, the flow velocity of the cleaning liquid supplied into the cleaning container is rapidly increased, so that the flow of the cleaning liquid can be reliably changed from the laminar flow to the turbulent flow in the cleaning container.

It is a schematic flow chart which shows the whole of the cleaning apparatus. It is a schematic flow chart which shows the whole of the conventional cleaning apparatus.

Hereinafter, embodiments of the present invention will be described with reference to FIG.
The cleaning device 1 of the present invention accommodates the object W to be cleaned inside the cleaning container 2, and supplies the cleaning liquid 3 into the cleaning container 2 to clean the stored object W.

[1. Cleaning liquid and object to be cleaned]
The object W to be cleaned of the cleaning device 1 of the embodiment is a machined metal part to which dirt of oils and fats is attached, and the cleaning liquid 3 used is an alkaline cleaning agent.
The objects to be cleaned W are sent one by one to the cleaning points P provided in the middle of the continuous conveyor 4, or a plurality of objects W that can be accommodated in the cleaning container 2 are sent in order, or are not shown. , The cleaning device 1 is sequentially sent to the cleaning points provided between the two transport conveyors arranged in the transport direction in the above units by an appropriate transfer device, and the cleaning device 1 is sent to the cleaning point P. The object to be cleaned W to be stopped is cleaned in the above units.

[2. Cleaning container]
The cleaning container 2 is composed of a box-shaped lower jig 2a having an opening on the upper surface and an inverted box-shaped upper jig 2b having an opening on the lower surface, and the openings of the upper jig 2b and the lower jig 2a are directly opened to each other. It can be sealed by abutting or connecting the two via a part of the frame 4a of the conveyor 4, and as shown in the imaginary line of FIG. 1, the upper jig 2b is appropriately raised and lowered. It can be opened and closed.

The cleaning device 1 of the embodiment has a cleaning liquid supply flow path 5 for supplying the cleaning liquid 3 into the cleaning container 2 and a cleaning liquid discharge flow path 6 for discharging the cleaning liquid 3 supplied to the cleaning container 2 with the cleaning container 2 as the core. And have.

[3. Cleaning liquid supply channel]
The cleaning liquid supply flow path 5 communicates the first liquid storage tank 7 that can store the cleaning liquid 3, the second liquid storage tank 8 that can also store the cleaning liquid 3, and the first liquid storage tank 7 and the second liquid storage tank 8. A supply first pipe 9 for communication, a cleaning liquid supply pump 10 provided in the middle of the supply first pipe 9, a supply second pipe 11 for communicating the second liquid storage tank 8 and the cleaning container 2, and a supply second pipe 11 thereof. 2 It is roughly composed of an on-off valve 12 provided in the middle of the pipe 11.

The first liquid storage tank 7 is arranged at a place lower than the washing container 2, while the second liquid storage tank 8 is arranged at a place higher than the washing container 2 (preferably directly above the washing container 2). The cleaning liquid 3 of the first liquid storage tank 7 is pumped to the second liquid storage tank 8 at a high place by the cleaning liquid supply pump 10 of the supply first pipe 9.

The second liquid storage tank 8 communicates with the outside air via a ventilation pipe 13, and the atmospheric pressure cross-sectional area of the cleaning liquid 3 stored in the second liquid storage tank 8 communicates with the second liquid storage tank 8. The relationship is sufficiently wider than the cross-sectional area of the supply second pipe 11 that is used.
Further, the second liquid storage tank 8 is equipped with a heat exchanger 14 capable of adjusting the cleaning liquid 3 to a set temperature.
Further, in the second liquid storage tank 8, an overflow tank 16 having a return flow path 15 communicating with the first liquid storage tank 7 is juxtaposed via a weir 17, and a predetermined liquid storage tank 8 is provided. Excess cleaning liquid 3 that exceeds the amount (preferably the amount of cleaning liquid 3 required for one cleaning) overflows from the weir 17 and drops into the overflow tank 16, and the cleaning liquid 3 passes through the return flow path 15 due to its own weight. 1 It is designed to return to the liquid storage tank 7. Therefore, the cleaning liquid supply pump 10 of the first supply pipe 9 can be efficiently operated at a constant output (flow rate) regardless of the cleaning timing.

The on-off valve 12 is, for example, an electromagnetic valve that uses a solenoid or the like as a drive source, and can alternately and instantly switch between supplying and stopping the cleaning liquid 3 to the cleaning container 2 by opening and closing the supply second pipe 11.

[4. Cleaning liquid discharge flow path]
The cleaning liquid discharge flow path 6 is composed of a discharge pipe 18 connected to the lower jig 2a of the cleaning container 2 and a suction means 19 capable of sucking the outside air in the cleaning container 2 and the cleaning liquid 3 through the discharge pipe 18. Become.
The suction means 19 is a circulation pump that circulates a circulation flow path 20 that exits the first liquid storage tank 7 and makes a U-turn to the first liquid storage tank 7 and a cleaning liquid 3 of the first liquid storage tank 7 in the circulation flow path 20. It is composed of 21 and an ejector (three-way valve) 22 connected in the middle of the circulation flow path 20.
This ejector 22 is a known one having an inflow portion 22a, an outflow portion 22b, and a suction portion 22c. The inflow portion 22a and the outflow portion 22b are connected in the middle of the circulation flow path 20, and the cleaning liquid is connected to the remaining suction portion 22c. The discharge pipe 18 of the discharge flow path 6 is connected.

[5. Cleaning method]
Next, a cleaning method using the cleaning device 1 of the embodiment will be described.
The cleaning device 1 constantly operates the cleaning liquid supply pump 10 of the cleaning liquid supply flow path 5 and the circulation pump 21 of the cleaning liquid discharge flow path 6 at a substantially constant output, and closes the on-off valve 12 of the cleaning liquid supply flow path 5. The middle of the supply second pipe 11, that is, the bottom of the second liquid storage tank 8 is closed.
Therefore, in the cleaning liquid supply flow path 5, the cleaning liquid 3 is pumped from the first liquid storage tank 7 to the second liquid storage tank 8 at a substantially constant flow rate, and the excess liquid storage amount exceeding the predetermined liquid storage amount of the second liquid storage tank 8 is exceeded. A circulation is constantly performed in which the cleaning liquid 3 flows into the overflow tank 16 over the weir 17, and the cleaning liquid 3 returns from the overflow tank 16 through the return flow path 15 to the first liquid storage tank 7 by its own weight.
On the other hand, in the cleaning liquid discharge flow path 6, the cleaning liquid 3 stored in the first liquid storage tank 7 always circulates through the circulation flow path 20 at a substantially constant flow rate, and the suction portion of the ejector 22 is circulated by the circulation of the cleaning liquid 3. The outside air of the cleaning container 2 (lower jig 2a) is constantly sucked from 22c. Since the mechanism by which the outside air is sucked from the suction portion 22c of the ejector 22 by the flow of the liquid is well known, the description thereof will be omitted.

The cleaning container 2 of the cleaning device 1 has an upper jig as shown in FIG. 2b has risen and is waiting in an acceptable state. Then, when the object W to be cleaned stops at the cleaning point P, the upper jig 2b is lowered as shown by the solid line in the figure, and the object W to be cleaned is housed in a sealed state between the object W and the lower jig 2a.

As described above, since the outside air of the cleaning container 2 is constantly sucked by the ejector 22, when the cleaning container 2 is sealed, the inside of the cleaning container 2 is decompressed from the atmospheric pressure and becomes a negative pressure state.
When the on-off valve 12 is opened in this state to open the bottom of the second liquid storage tank 8, the cleaning liquid 3 of the second liquid storage tank 8 is derived from the height from the liquid surface to the upper jig 2b and the gravitational acceleration. It will be supplied into the washing container 2 at a flow velocity V _{0 (Torricelli's theorem).} Further, in the cleaning container 2, the flow velocity of the supplied cleaning liquid 3 is accelerated by the negative pressure state and the continuous suction action by the ejector 22. At this time, the cleaning liquid 3 becomes a liquid flow of the limit number of ray nozzles (Re = 2300) or more in the cleaning container 2, and transitions from the laminar flow up to that point to a turbulent flow. By transitioning the cleaning liquid 3 flowing in the cleaning container 2 from the laminar flow to the turbulent flow in this way, the thickness of the boundary layer at the interface between the surface of the object W to be cleaned and the cleaning liquid 3 becomes small, so that it is on the level of several microns to submicrons. The removability of particles is greatly improved. Further, since the turbulent flow is formed, the flow path design in the cleaning container 2 becomes simple, and a plurality of objects W to be cleaned having a different shape can be mixed, so that the cleaning device 1 is versatile. Increase.
Then, the cleaning liquid 3 that has flowed through the object W to be cleaned joins the cleaning liquid 3 that circulates in the circulation flow path 20 through the ejector 22 together with the removed dirt, and is returned to the first liquid storage tank 7.

When the cleaning device 1 finishes cleaning, the opening / closing valve 12 opened earlier is switched to close the bottom of the second liquid storage tank 8 and the supply of the cleaning liquid 3 into the cleaning container 2 is stopped. While the on-off valve 12 is open, the cleaning liquid 3 in the second liquid storage tank 8 continues to flow out and the liquid storage level drops, but the cleaning liquid 3 is sent from the first liquid storage tank 7 at a constant flow rate by the cleaning liquid supply pump 10. As soon as the on-off valve 12 is closed, the second liquid storage tank 8 recovers the predetermined liquid storage amount.
On the other hand, even after the on-off valve 12 is closed and the supply of the cleaning liquid 3 is stopped, the suction action by the ejector 22 continues as it is, so that the cleaning liquid 3 remaining in the cleaning container 2 is forcibly sucked out to the end. Therefore, the liquid to be cleaned W is also drained well.
Further, since the cleaning container 2 is hermetically sealed, the inside of the container is depressurized and negative pressure progresses. Therefore, although not shown, an air release valve is provided between the on-off valve 12 and the outlet of the supply second pipe 11. If this is opened, the air can be introduced into the cleaning container 2 at once, and the cleaning liquid adhering to and remaining on the object W to be cleaned can be wiped off, and the liquid drainage of the object W to be cleaned can be improved.
By repeating the opening and closing of the on-off valve 12 intermittently, a water hammer action (air hammer phenomenon) can be accompanied, so that the cleaning property and the drainage property of the cleaning liquid can be further improved.

When the cleaning in the cleaning container 2 is completed and all the cleaning liquid 3 in the cleaning container 2 is discharged as described above, the upper jig 2b rises to the standby position, the transport conveyor 4 operates, and the cleaning point P One or a set of objects to be cleaned W that are washed together are sent to the next step, and the next object to be cleaned W is moved to the cleaning point P.
Hereinafter, the above cleaning process by the cleaning device 1 is repeated.

By the way, when the above cleaning treatment is repeated, dirt of oils and fats that cannot be completely dispersed in the cleaning liquid 3 eventually emerges in the first liquid storage tank 7, and at the level shown by the alternate long and short dash line in FIG. 1, for example. For separation, the first liquid storage tank 7 is provided with a waste oil drain 23 for discharging such floating oil and fat stains.
The cleaning liquid used is preferably a water-soluble one having good oil / water separability in order to more reliably discharge oil and fat stains by the waste oil drain 23. In particular, a cleaning liquid in which the dissolution characteristics of fats and oils change depending on the temperature is suitable.
Some cleaning liquids 3 of nonionic surfactants and glycol ether solvents are in a transparent or translucent aqueous solution at low temperatures, but when the liquid temperature is raised, they become turbid from a certain temperature, and the temperature is further increased. Some of them separate from water as they are raised. The temperature at which the phase separates is called the cloud point of the cleaning liquid. Further, this phenomenon returns to the original transparent aqueous solution state when the liquid temperature is lowered until it falls below the cloud point. Therefore, when the temperature of the cleaning liquid is raised until it exceeds the cloud point, the phase-separated detergent components become highly lipophilic (low water concentration), and the cleaning (dissolving) ability for fats and oils is improved. Further, when the temperature of the cleaning liquid is lowered until it falls below the cloud point, it becomes a transparent or translucent aqueous solution, that is, a state of high hydrophilicity (low solubility of fats and oils), and the fats and oils dissolved in the detergent components are separated from the cleaning liquid. It will float and separate due to the difference in specific gravity with the cleaning liquid.
Cleaning solutions with such characteristics include, for example, Musashi Techno Chemical's MA series (MA-60, etc.), Kao's clean-through "LC-800" series, Arakawa Chemical's Pine Alpha ST-251EVA, and Sanwa. There are Sunclean XL-35 manufactured by Yuka Co., Ltd., which are suitable for discharging oil and fat stains from the waste oil drain 23.
As an operating condition when these cleaning liquids 3 are used, the cleaning liquid temperature of the second liquid storage tank 8 is heated by the heat exchanger 14 to a temperature higher than the cloud point of the cleaning liquid 3, and the cleaning liquid 3 is further heated by a stirring means (not shown). Stir to make an emulsion. Further, the first liquid storage tank 7 is provided with a cooling means (not shown) to keep the cleaning liquid temperature of the cleaning liquid 3 below the cloud point.
When combined with a cleaning agent whose dissolution characteristics of oils and fats change depending on the liquid temperature, the cleaning liquid can be circulated and reused with a simple mechanism, reducing cleaning costs by extending the life of the cleaning liquid and reducing the generation of cleaning waste liquid. -An energy-saving and environment-friendly cleaning system with high versatility can be realized.

Although the present invention has been described above with embodiments, the present invention is, of course, not limited to the above embodiments. For example, in the embodiment, the objects to be cleaned W are individually washed, or a plurality of objects W that can be stored in the cleaning container 2 are grouped and continuously washed, but a large number of objects W to be cleaned are collectively washed in batches. It may be processed separately. However, when the lots are reduced by continuous processing as in the embodiment, the equipment size is reduced, so that the cleaning process can be in-lined, which is more preferable in that reliability and rationality can be improved.
Further, in the embodiment, the ejector 22 is used as the suction means 19, but a vacuum pump may be separately provided in place of such an ejector 22.
Further, the on-off valve 12 is not limited to an electric valve such as a solenoid valve, and may be a manual valve that is manually switched.

1 ... Cleaning device 2 ... Cleaning container 3 ... Cleaning liquid 5 ... Cleaning liquid supply flow path 6 ... Cleaning liquid discharge flow path 7 ... First liquid storage tank 8 ... Second liquid storage tank 12 ... On-off valve 15 ... Return flow path 19 ... Suction means 20 ... Circulation flow path 21 ... Circulation pump 22 ... Ejector 22a ... Inflow part 22b ... Outflow part 22c ... Suction part W ... Object to be cleaned

Claims (4)

A cleaning device in which an object to be cleaned is housed inside a cleaning container and a cleaning liquid is supplied into the cleaning container to clean the object to be cleaned.
A cleaning liquid supply flow path for supplying the cleaning liquid into the cleaning container,
It is provided with a cleaning liquid discharge flow path for discharging the cleaning liquid in the cleaning container.
The cleaning liquid supply flow path is provided with an on-off valve capable of switching between supply and stop of the cleaning liquid to the cleaning container.
On the other hand, the cleaning liquid discharge flow path is provided with a suction means capable of sucking the outside air in the cleaning container and the cleaning liquid.
The on-off valve is closed to stop the supply of the cleaning liquid into the cleaning container, and the outside air in the cleaning container is sucked by the suction means to create a negative pressure.
With the inside of the cleaning container under negative pressure, the on-off valve is opened to supply the cleaning liquid into the cleaning container.
Further, the on-off valve is closed to stop the supply of the cleaning liquid while the cleaning liquid is being supplied into the cleaning container, and the cleaning liquid in the cleaning container is sucked by the suction means and discharged to the cleaning liquid discharge flow path. A cleaning device characterized by the fact that it has been made. The cleaning liquid supply flow path leads from the first liquid storage tank that can store the cleaning liquid to the second liquid storage tank that can also store the cleaning liquid, and further from the second liquid storage tank to the cleaning container via the on-off valve. It has become
On the other hand, the cleaning liquid discharge flow path leads from the cleaning container to the first liquid storage tank via the suction means.
The cleaning device according to claim 1, further comprising a return flow path for returning excess cleaning liquid exceeding a predetermined storage amount to the first storage tank. The suction means has a circulation flow path for circulating the cleaning liquid of the first liquid storage tank by a circulation pump, an inflow part, an outflow part, and a suction part, and the inflow part and the outflow part are in the middle of the circulation flow path. The cleaning apparatus according to claim 1 or 2, further comprising an ejector connected to the ejector, and connecting the cleaning liquid discharge flow path to the suction portion of the ejector. The second liquid storage tank is provided at a higher place than the cleaning container, and the cleaning liquid in the second liquid storage tank is dropped by its own weight and a suction action by the suction means in a state where the on-off valve is open. The cleaning device according to any one of claims 1 to 3, wherein the cleaning device can flow into the cleaning container.

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