JP3593593B2 - Drying method and drying device for parts - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drying method and a drying apparatus for drying various components such as electronic components, metal components, precision components, etc., which have been cleaned by a cleaning liquid.
[0002]
[Prior art]
Parts such as electronic parts, metal parts, precision parts, and the like may be contaminated with oils and fats in a manufacturing process, and therefore, have been conventionally washed and dried by a washing and drying apparatus.
[0003]
As such a washing and drying apparatus, for example, a configuration disclosed in Japanese Patent No. 2621800 is known. As shown in FIG. 4, the washing and drying apparatus is an apparatus for washing and drying the above-described components (hereinafter, referred to as “objects to be washed”) held in a cylinder 52, wherein the cylinder 52 is The container includes a container 54 to be inserted and installed, a liquid circulating unit 70 for allowing the cleaning liquid to pass through and externally circulate the inside of the container 52, and a blowing unit 80 for sending wind or hot air into the container 52.
[0004]
The container 52 is a closed-end, bottomed cylindrical body capable of accommodating the article to be cleaned a, and is provided with a flange portion 51 at an upper end. Further, a through hole is formed in the bottom plate 53 so that liquid can be passed in the axial direction.
[0005]
An annular member 55 is provided on the inner peripheral surface of the container 54, and the container 52 is supported by engaging the flange portion 51 on the upper surface of the annular member 55. The flange 51 and the annular member 55 are sealed by surface contact.
[0006]
The liquid circulation means 70 includes a tank 50 for storing the cleaning liquid, a liquid circulation line 56 for connecting the tank 50 and the container 54 in a loop, and a pump 58 for circulating the cleaning liquid. The liquid circulation line 56 includes a forward path 56a and a return path 56b, and a valve V1 and a valve V2 are provided in the middle of the forward path 56a and the return path 56b, respectively.
[0007]
The blowing means 80 includes an air supply line 60 branched from the outward path 56a and an exhaust line 62 branched from the return path 56b. The air supply line 60 is provided with a blower 64 and a heater 66 in series. A valve V3 and a valve V4 are provided in the air supply line 60 and the exhaust line 62, respectively.
[0008]
The cleaning liquid in the vessel 52 and the cleaning tower 54 can be returned to the tank 50 via the return line 57 by opening the valve V5. The exhaust line 62 is provided with a gas-liquid separator 68, and the separated washing liquid is returned to the tank 50 via the return line 69 by opening the valve V6.
[0009]
When operating the washing / drying apparatus having the above configuration, first, the valves V1 and V2 are opened, the valves V3 to V5 are closed, and the pump 58 is operated to circulate the washing liquid in the liquid circulation line 56. Let it. The cleaning liquid flowing into the upper part of the container 54 cleans the object a to be cleaned in the process of passing through the inside of the container 52 and flowing out of the through-hole of the bottom plate 53, and ascends the gap between the container 52 and the container 54. And is discharged from the container 54.
[0010]
After the cleaning process for a predetermined time, the pump 58 is stopped, the valves V1 and V2 are closed, and the valves V3 to V5 are opened. The cleaning liquid in the container 52 and the container 54 is collected in the tank 50 via the return line 57. After the recovery of the cleaning liquid is completely completed, the valve V5 is closed.
[0011]
Next, the blower 64 is operated to blow air into the container 52 for a predetermined time to drain the liquid to be cleaned a. Next, the heater 66 is operated for a predetermined time to supply heated air into the container 52, thereby drying the object a to be cleaned. In this way, after the liquid draining step and the drying step for a predetermined time, the operations of the blower 64 and the heater 66 are stopped, the container 52 is taken out from above the container 54, and the next container 52 holding the object to be cleaned is taken out. Replace it and repeat the cleaning process.
[0012]
As described above, according to this washing and drying apparatus, washing, draining, and drying can be performed collectively, and a large amount of objects to be washed can be efficiently washed by exchanging the barrel 52.
[0013]
[Problems to be solved by the invention]
In the above-mentioned conventional cleaning and drying apparatus, after the drying step is completed, the blower 64 and the heater 66 are stopped and the valve V3 is closed to start the next cleaning step of the object to be cleaned. While the air is kept at a high temperature for a while, the air around the heater 66 becomes very high because the air supply to the heater 66 is stopped. For this reason, when performing the liquid draining process next time, the high-temperature air is supplied to the cleaning target a in the container 52 for a while even though the heater 66 is not operated. In the early stage of the process, a large amount of droplets adhering to the object to be cleaned a are heated to a high temperature.
[0014]
If the object to be cleaned is a metal such as aluminum, nickel, copper, zinc, lead, tin, or an alloy such as brass or brass, or a component containing a material that is easily corroded, such as a plated component, it may adhere. The higher the temperature of the water droplet, the more easily it reacts. Therefore, as described above, if high-temperature air is supplied without sufficiently removing the droplet, there is a problem that the object to be cleaned is easily corroded and discolored.
[0015]
In addition, when the object to be cleaned is made of a different metal such as iron and copper, there is a possibility that a local battery reaction may occur if water droplets adhere to these gaps. That is, since the resistance decreases when the temperature of the water drops increases (for example, when the temperature increases from 20 ° C. to 50 ° C., the resistance decreases to about 1/3), iron ions and the like of the object to be cleaned are easily dissolved and corrosion occurs. As a result, the resistance further decreases, and as a result, there is a problem that corrosion progresses at an accelerated rate.
[0016]
In order to solve such a problem in the conventional cleaning / drying apparatus, it is necessary to continue blowing air even after the heater 66 is stopped to sufficiently cool the heater 66, so that it takes a long time to drain and dry the liquid. There was a problem.
[0017]
The present invention has been made in order to solve the above problems, and a method for drying parts that can quickly perform liquid removal and drying while preventing corrosion and discoloration of an object to be cleaned, and The purpose is to provide a drying device.
[0018]
[Means for Solving the Problems]
The object of the present invention is a method of drying an object to be cleaned which is held in a container having a bottom without a lid and having a through hole at the bottom and washed with a cleaning liquid, and blowing room temperature air into the container. A draining step, and a drying step of supplying air heated to about 60 ° C. to 100 ° C. by the heating means into the container, and in the draining step, the heating means is bypassed to bypass the heating means. This is achieved by a method for drying parts, in which the room temperature air is supplied without passing through, and the droplets adhering to the object to be cleaned are sufficiently removed, and then the drying step is started.
[0019]
Further, the object of the present invention is an apparatus for drying an object to be cleaned, which is held in a container having a bottom without a lid and having a through hole at the bottom and washed with a cleaning liquid, wherein the container is supported inside. And a blower for blowing air into the container via a first flow passage connected to the housing, wherein the blower is provided with a first air passage provided in the first flow passage. , A second flow path that bypasses the first valve in the first flow path, and air that is provided in the second flow path and passes air passing through the second flow path at 60 ° C. Heating means for heating to about 100 ° C. , further comprising a second valve and a third valve provided respectively on the upstream and downstream sides of the heating means in the second flow path, And controlling the second valve and the third valve to be in a closed state when stopped. It is achieved by that component such drying apparatus.
[0020]
In this drying device , it is preferable that the blowing unit further includes an exhaust passage. Further, it is preferable to further include a liquid circulating means for causing the cleaning liquid to pass through the cylinder and circulate outside the container.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram illustrating an apparatus for drying parts according to an embodiment of the present invention. The drying apparatus according to the present embodiment differs from the conventional cleaning / drying apparatus shown in FIG. 4 in that the blowing means 80 is replaced with a new blowing means 10, and the other parts are the same as the conventional structure. Therefore, the same components as those in the related art are denoted by the same reference numerals, and description thereof will be omitted.
[0022]
As shown in FIG. 1, the blower 10 provided in the drying apparatus includes a first flow path 12 branched from an outward path 56a and an exhaust flow path 14 branched from a return path 56b. The flow path 12 is connected to a blower 16, and a first valve V10 is provided on the way.
[0023]
The first flow path 12 is provided with a second flow path 18 so that the air flow from the blower 16 bypasses the valve V10. A valve V11 is provided downstream of the junction. A heater 20 is provided in the second flow path 18, and a second valve V12 and a third valve V13 are provided on the upstream side and the downstream side of the heater 20, respectively.
[0024]
Next, a method for drying an object to be cleaned by using the drying apparatus having the above configuration will be described. First, the valves V1, V2, and V10 are opened, the valves V4 to V7, and V11 to V13 are closed, and the pump 58 is operated to circulate the cleaning liquid in the liquid circulation line 56 and held in the container 52. The cleaned object a is cleaned. Although pure water (rinse water) is used as the cleaning liquid in the present embodiment, various other types of water-based cleaning agents, alcohol-based cleaning agents, and hydrocarbon-based cleaning agents can be used.
[0025]
After the cleaning process for a predetermined time, the pump 58 was stopped, the valves V1 and V2 were closed, and the valves V4, V5, and V11 were opened, and the cleaning liquid in the container 52 and the container 54 was collected in the tank 50. Thereafter, the valve V5 is closed.
[0026]
Next, the blower 16 is operated to blow air into the container 52 via the valve V10, and the liquid draining step is performed for a predetermined time. In order to surely perform the liquid draining in a short time, it is preferable that the blowing amount of the blower 16 is as large as possible, for example, 20 to 30 m ³ per minute. The time required for draining is, for example, about 3 minutes.
[0027]
After the liquid to be washed a is sufficiently drained, the heater 20 is operated, the valve V10 is closed, and the valves V12 and V13 are opened, and the drying process is performed for a predetermined time. As a result, the air from the blower 16 is supplied into the container 52 after being heated by the heater 20, and a small amount of the cleaning liquid remaining on the cleaning target a is evaporated and dried by the heated air. The temperature of the heated air is preferably about 60 ° C. to 100 ° C., and the amount and time of air blown by the blower 16 are determined in consideration of the heating capacity of the heater 20. As an example, when the capacity of the heater 20 is 10 kW, the blowing amount of the blower 16 is about 5 m ³ per minute, and the blowing time is about 7 minutes. Adjustment of the amount of air blown by the blower 16 in the liquid removing step and the drying step can be performed by changing the rotation speed of the blower by an inverter or adjusting the opening degrees of the valves V10, V12, and V13. In the liquid draining step and the drying step, the valves V5 and V6 may be appropriately opened and closed to return the cleaning liquid stored in the container 54 and the gas-liquid separator 68 to the tank 50.
[0028]
After the object to be cleaned a is dried, the blower 16 and the heater 20 are stopped, the valve V10 is opened, and the valves V11 to V13 are closed. Then, after exchanging the cylinder 52 for the next cylinder 52, the above-described cleaning step is started again.
[0029]
As described above, according to the drying device according to the present embodiment, the second flow path 18 through which the heated air passes is provided separately from the first flow path 12 through which the normal temperature air passes, and the upstream side of the heater 20 is provided. Further, since the valves V12 and V13 are provided on the downstream side, the air that has become hot due to the heat remaining in the heater 20 after the stop does not flow out to the first flow path 12. Therefore, when the liquid draining process is performed next time, the air supplied from the blower 16 to the container 52 via the valve V10 is prevented from being heated, and can be made substantially equal to the atmospheric temperature of the apparatus. Corrosion and discoloration of the object to be cleaned due to the heated droplets can be prevented. Furthermore, since it is not necessary to send air to the stopped heater 20 to cool it, the drying process can be sped up.
[0030]
As mentioned above, although one Embodiment of this invention was described in full detail, the specific aspect of the drying apparatus which concerns on this invention is not limited to this. For example, in the present embodiment, the blower 16 is provided on the upstream side of the housing 54, but the blower 16 may be provided on the exhaust passage 14 downstream of the housing 54. In the present embodiment, only one blower 16 as an air supply source is provided by bypassing the second flow path 18 from the first flow path 12. The second flow paths 18 may be connected to separate air supply sources.
[0031]
Further, the liquid circulating means 70 provided in the drying device of the present embodiment is not always necessary. As shown in FIG. 2, the liquid circulating means 70 may be configured to include only the container 54 and the air blowing means 10 to perform the liquid removing and drying steps. It is possible. According to this configuration, the temperature of the air supplied in the draining step is maintained sufficiently lower than the configuration of the conventional drying device in which the blower 64 and the heater 66 are provided in series with the air supply line 60 as shown in FIG. As in the above embodiment, the drainage and drying can be performed quickly while preventing corrosion and discoloration of the object to be cleaned.
[0032]
Further, since the liquid circulating means 70 is not provided, the apparatus can be reduced in size and simplified, maintenance is easy, and a separately provided cleaning device (not shown) is used. After the object to be cleaned is washed, draining and drying can be started immediately simply by transporting the container 52 to the container 54, so that the process can be further speeded up and a large amount of cleaning can be performed. This is particularly effective when drying the object.
[0033]
Preferably, the exhaust passage 14 is provided on the side wall of the container 54 so that the heated air supplied to the container 52 comes into contact with the entire outer peripheral surface of the container 52 and is discharged from the container 54. Accordingly, in the drying step, not only the object a to be cleaned but also the container 54 itself can be surely dried. As shown in FIG. 3, a mist separator 22 is provided on the downstream side of the exhaust flow path 14, and the collected cleaning liquid is supplied via a valve V6 to a cleaning liquid tank (not shown) of a cleaning device provided separately. You may return it.
[0034]
【The invention's effect】
As is clear from the above description, according to the method for drying parts according to the present invention, in the liquid draining step of blowing room temperature air into the cylinder, air is supplied without passing through the heating means. Therefore, there is no possibility that the temperature of the droplets adhered to the object to be cleaned becomes high. Therefore, corrosion and discoloration of the object to be cleaned can be reliably prevented, and quick draining and drying can be performed.
[0035]
In addition, according to the parts drying apparatus according to the present invention, the container includes a housing in which the cylinder is housed, and a blowing unit that blows air into the cylinder. Since the heating means is provided in the second flow path provided by bypassing the first valve, it is possible to supply the air into the container without passing through the heating means. The liquid draining step and the drying step can be performed with a small and compact configuration.
[0036]
Further, by providing the second valve and the third valve respectively on the upstream side and the downstream side of the heating means, it is possible to more reliably prevent corrosion and discoloration of the object to be cleaned.
[0037]
Furthermore, the provision of the liquid circulating means for allowing the cleaning liquid to pass through the inside of the cylinder enables the cleaning, draining and drying of the object to be cleaned to be performed efficiently in a lump.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram illustrating a drying device according to an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram illustrating a drying device according to another embodiment of the present invention.
FIG. 3 is a schematic configuration diagram showing a drying apparatus according to still another embodiment of the present invention.
FIG. 4 is a schematic configuration diagram showing a conventional cleaning / drying apparatus.
FIG. 5 is a schematic configuration diagram showing a conventional drying device.
[Explanation of symbols]
Reference Signs List 10 blowing means 12 first flow path 16 blower 18 second flow path 20 heater 52 container 53 bottom 54 container 58 pump 70 liquid circulation means V10 first valve V12 second valve V13 third valve a Wash

Claims (4)

A method of drying an object to be washed, which is held in a container having a through hole at the bottom with a bottom without a lid and washed with a washing liquid,
A liquid draining step of blowing room temperature air into the cylinder, and a drying step of supplying air heated to about 60 ° C. to 100 ° C. by a heating unit into the cylinder,
In the liquid draining step, supplying the room temperature air without passing through the heating means by bypassing the heating means, and after sufficiently removing the droplets attached to the object to be cleaned, starting the drying step. A method for drying parts. An apparatus for drying an object to be washed, which is held in a container having a bottom with a through hole and having a bottom with an open bottom, and washed with a washing liquid,
A container that internally supports the container, and a blower that blows air into the container via a first flow path connected to the container,
A first valve provided in the first flow path;
A second flow path that bypasses the first valve in the first flow path;
Heating means provided in the second flow path, for heating air passing through the second flow path to about 60 ° C. to 100 ° C.,
The apparatus further includes a second valve and a third valve provided on the upstream side and the downstream side of the heating unit in the second flow path, respectively.
An apparatus for drying parts, wherein the second valve and the third valve are controlled to be closed when the heating means is stopped. The blowing means, parts such drying apparatus according to claim 2, further comprising an exhaust passage. 4. The apparatus for drying parts according to claim 2, further comprising a liquid circulating unit that allows the cleaning liquid to pass through the container and circulates outside the container. 5.

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