JP3397241B2 - Drying method and drying device for parts - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying method and a drying apparatus for drying various parts such as electronic parts, metal parts and precision parts that have been washed with a washing liquid.

[0002]

2. Description of the Related Art Parts such as electronic parts, metal parts, precision parts, etc. have been conventionally washed and dried by a washing / drying device because stains such as oils and fats may adhere to them in the manufacturing process.

As such a washing / drying apparatus, for example,
The configuration disclosed in Japanese Patent No. 2621800 is known. As shown in FIG. 3, this cleaning / drying device is a device for cleaning and drying the above-mentioned parts (hereinafter referred to as “object to be cleaned”) held in the container 52, and the container 52 is The container 54 to be inserted and installed, a liquid circulating means 70 for passing the cleaning liquid through the container 52 to circulate the cleaning liquid to the outside, and a blower 80 for sending air or hot air into the container 52.

The container 52 is a bottomed cylindrical body capable of accommodating the object a to be cleaned, and has a flange portion 51 at the upper end. Further, a through hole is formed in the bottom plate 53 so that liquid can pass through in the axial direction.

An annular member 55 is provided on the inner peripheral surface of the container 54, and the container 54 supports the container 52 by engaging with the flange portion 51 on the upper surface of the annular member 55. The flange portion 51 and the annular member 55 are sealed by surface contact.

The liquid circulating 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 5 for circulating the cleaning liquid.
8 and. 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.

The blower means 80 comprises 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 has a blower 64.
And the heater 66 are provided in series. Air supply line 6
0 and the middle of the exhaust line 62, the valve V3
And a valve V4.

The cleaning liquid inside the container 52 and the cleaning tower 54 can be returned to the tank 50 through the return line 57 by opening the valve V5. Also, the exhaust line 6
2 is provided with a gas-liquid separator 68, and the cleaning liquid separated here is returned to the return line 69 by opening the valve V6.
It is returned to the tank 50 via.

When operating the washing / drying apparatus having the above structure, first, the valves V1 and V2 are opened and the valve V is opened.
By closing 3 to V5 and operating the pump 58, the cleaning liquid in the liquid circulation line 56 is circulated. 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 from the through hole of the bottom plate 53, and raises the gap between the container 52 and the container 54. And discharged from the container 54.

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 for the container 52 and the container 54 is collected in the tank 50 via the return line 57. After the cleaning liquid is completely collected, the valve V5 is closed.

Next, the blower 64 is operated to operate the object to be cleaned a.
Liquid is drained, and the heater 66 is further operated to move the container 52
Heated air is supplied to the inside to dry the cleaning target a. Thus, after the draining process and the drying process for a predetermined time, the container 5
2 is taken out from above the container 54, replaced with the next container 52 holding the object to be cleaned, and the cleaning step is performed again.

As described above, according to the cleaning / drying apparatus, after cleaning the object to be cleaned a, the draining and the drying can be collectively performed by switching the valve, and the cleaning operation can be performed efficiently. You can

[0013]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The cleaning / drying apparatus disclosed in Japanese Patent No. 1800 is excellent in that the cleaning operation can be made efficient and the apparatus can be made compact, but there is room for further improvement in the draining and drying steps of the object to be cleaned. That is, in the conventional cleaning / drying apparatus, the blower 64 blows air into the vessel 52 to drain the object a to be cleaned, but the blower has a limit in terms of cost and size. However, there is a problem that it takes a long time to remove the adhered droplets.

Further, since the cleaning liquid existing in the recessed portion of the object to be cleaned a or the gap between the objects to be cleaned a is not removed by the air blow by the blower 64, the fine particles and the like remain when it is evaporated in the subsequent drying step. As a result, stains may occur, and a sufficient cleaning effect cannot be obtained.

Further, in the case where the article to be cleaned is, for example, a component in which the circuit board and the chip are joined by lead solder, a slight gap (20 to 100 μm) between the board and the chip.
There is also a problem that the cleaning liquid that has entered m) may not be blown off by the air blown by the blower 64 and may not evaporate in the subsequent drying step, and lead in the bonding portion may be eluted.

The present invention has been made to solve the above problems, and a method and a method for drying parts capable of quickly and surely draining an object to be cleaned and enhancing the cleaning effect. The purpose is to provide a device.

[0017]

The above object of the present invention is a method for drying an object to be cleaned, which is held in a container having an open bottom and a through hole at the bottom and washed with a cleaning liquid. Previous
Items to be cleaned include parts having a gap of 20 to 100 μm.
, And the after blown by the blower into the volume tube, and intermittently supplying fluid cutting step the compressed air, the liquid cutting step
And a drying step of supplying heated air into the container, which is accomplished by a method for drying parts.

The pressure of the compressed air is 0.05 to 2.0.
It is preferably MPa.

Further, the above object of the present invention is an apparatus for drying an object to be cleaned, which is held in a container having an open bottom and a through hole at the bottom, and which has been cleaned with a cleaning liquid .
Is a component having a gap of 20 to 100 μm, has a container for supporting the container inside, a blower and heating means, and blower means for supplying room temperature air or heated air into the container. , Compressed air supply means for supplying compressed air into the container, and the blower means for connecting the container
After the air is blown in, compressed air is supplied by the compressed air supply means.
Is supplied intermittently, and then the blower means
This is achieved by a device for drying parts, which is characterized in that heated air is supplied into the cylinder .

It is preferable that the drying apparatus further comprises a liquid circulating means for passing the cleaning liquid through the container and circulating the cleaning liquid outside the container.

[0021]

DETAILED DESCRIPTION OF THE INVENTION Referring to the accompanying drawings,
A specific embodiment of the present invention will be described. Figure 1
FIG. 1 is a schematic configuration diagram showing a drying device for components according to an embodiment of the present invention. The drying device according to the present embodiment is shown in FIG.
The conventional washing and drying apparatus shown in FIG. 6 is further provided with compressed air supply means, and the other parts are the same as the conventional structure. Therefore, the same components as those of the related art are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, the compressed air supply means 10 provided in this drying device has a compressor 12 and an air tank 14 for storing the compressed air supplied from the compressor 12. 12 and the air tank 14 are connected to the valve V1 in the forward path 56a of the liquid circulation line 56 via the compressed air supply line 16.
Is connected to the downstream side of. In the compressed air supply line 16, a valve V7 is provided on the downstream side of the air tank 14, and a valve V8 and a pressure reducing valve 18 are provided on the upstream side of the air tank 14. The internal pressure of the air tank 14 can be adjusted by the pressure reducing valve 18, and the blowing pressure of the compressed air when the valve V7 is opened is controlled by this internal pressure.

The pressure in the air tank 14 depends on the size of the cross-sectional area of the container 52 and the like, but is preferably 0.05 MPa or more so that the effects described later by supplying the compressed air can be sufficiently obtained. , And more preferably 0.1 MPa
That is all. It should be noted that 2.0 MPa or less is practically sufficient. The capacity of the air tank 14 is, for example, 60L.

Next, a method of drying an object to be cleaned using the drying device having the above structure will be described. First,
The valves V1 and V2 are opened, the valves V3 to V8 are closed, and the pump 58 is operated to circulate the cleaning liquid in the liquid circulation line 56 to clean the object a to be cleaned held in the container 52. I do. As the cleaning liquid, pure water (rinsing water) is used in the present embodiment, but various kinds of water-based cleaning agents, alcohol-based cleaning agents, hydrocarbon-based cleaning agents, etc. can be used.

After the cleaning process for a predetermined time, the pump 5
8 is stopped, valves V1 and V2 are closed, and valve V3
~ Open V5. After collecting the cleaning liquid for the container 52 and the container 54, the valve V5 is closed.

Then, the blower 64 is operated for a predetermined time to blow air into the container 52, and the liquid a to be cleaned a is roughly drained, and then the blower 64 is stopped and the valve V3 is closed. To Draining with the blower 64
Compared with the conventional technique, the time required is extremely short, for example, about 30 to 60 seconds. Next, after supplying the compressed air of a predetermined pressure stored in the air tank 14 into the container 52 by opening the valve V7, the valve V7 is closed and the valve V8 is opened to set the pressure in the air tank 14 to the predetermined pressure. Return to. Then, the valve V8 is closed again and the valve V7 is opened.
Compressed air is supplied into the container 52.

As described above, the valves V7 and V8 are intermittently and repeatedly opened and closed to intermittently supply the compressed air into the container 52. The compressed air blows off the liquid droplets remaining on the object to be cleaned a while passing through the gap between the objects to be cleaned a filled in the container 52, and is then discharged through the exhaust line 62. The opening time and the number of times of opening and closing the valve V7 are not particularly limited, but may be repeated about 3 times with the opening time of 5 seconds, for example.

After draining the object a to be cleaned in this way,
The valves V7 and V8 are closed and the valve V3 is opened. Then, the blower 64 and the heater 66 are operated for a predetermined time so that the temperature is higher than normal temperature (for example, 40 to 12).
(0 ° C.) heated air is supplied into the container 52 to evaporate a small amount of cleaning liquid remaining on the object to be cleaned a and dry it.

After the object to be cleaned a is dried, the blower 64 and the heater 66 are stopped and the valves V3 and V4 are closed.
The washing and drying operations are completed. After this, the container 52
The cleaning operation can be restarted by replacing the with the next container. In the liquid draining process and the drying process, 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.

As described above, according to the drying apparatus and the drying method of the present embodiment, the container cylinder 52 having the through hole in the bottom 53 is provided.
Since the object a to be cleaned is held therein, and the compressed air is supplied to the container 52 by the compressed air supply means 10, the compressed air collides with the entire object a to be cleaned at a high speed, and Pass through 52. Therefore, the droplets adhering to each of the objects to be cleaned a are uniformly blown off, and the liquid can be drained in a short time.

The object to be cleaned a held in the container 52
By increasing the filling rate of each of the objects to be cleaned a in the dense state, the flow velocity of the air further increases, and the container 5
A violent turbulence occurs inside 2. Therefore, it is possible to sufficiently enhance the drainage effect, and the contact portion between the objects to be cleaned,
Cleaning liquid that has entered the minute voids of electronic parts
It can be surely blown away. The container 52 is preferably vertically long as in the conventional case, whereby the compressed air is vigorously agitated in the container 52, and the liquid can be drained well. Specifically, when the container 52 has a cylindrical shape, the ratio of the diameter to the length is preferably 1: 1-10, more preferably 1: 2-5. Further, when the container 52 is in the shape of a rectangular tube, it is preferable that the ratio of the short side of the cross section, the long side of the cross section and the length is 1: 1 to 5: 1 to 10, and 1: 1 to 2: 1 to 1. More preferably, it is 5.

Further, since the compressed air is supplied intermittently by opening and closing the valve V7, the impact force of the compressed air is repeatedly applied to the object to be cleaned a. Due to this impact force, the relative positional relationship between the objects to be cleaned a gradually changes,
Along with this, the cleaning liquid between the objects to be cleaned a is exposed, so that the cleaning liquid can be drained more quickly and reliably.

Although one embodiment of the present invention has been described in detail above, the specific mode of the drying apparatus according to the present invention is not limited to this. For example, in the present embodiment, the compressed air supply line 16 is connected to the outward path 56a, but it may be directly connected to the upper portion of the container 54. Further, the compressed air may pass through the inside of the container 52 upward from the bottom portion 53 toward the upper opening, and the object a to be cleaned a in the container 52 is blown up by this, so that the space between the objects to be cleaned is increased. It becomes easier for compressed air to pass through, and the liquid draining effect can be further enhanced.

The liquid circulating means 70 provided in the drying apparatus of this embodiment is not always necessary, and as shown in FIG. 2, the container 54, the blowing means 80 and the compressed air supplying means 1 are provided.
It is also possible to configure the drying device such that 0 is provided and the liquid can be drained and dried by switching the valves V3 and V7. According to this configuration, the size and simplification of the device can be achieved, the maintenance is easy, and the container 52 is provided by a separately provided cleaning device (not shown).
Since the draining and drying can be started immediately only by transporting the container 52 to the container 54 after cleaning the object to be cleaned therein, the process can be speeded up and a large amount of the object to be cleaned can be cleaned. It is particularly effective when drying the product.

Further, regarding the drying method according to the present invention,
The present invention is not limited to the above embodiment. For example, in the present embodiment, the compressed air is supplied into the container 52 intermittently, but the effect of the present invention can be obtained even when the compressed air is continuously supplied. Instead of supplying compressed air, it is also possible to compress and supply an inert gas such as nitrogen gas.

In this embodiment, the blower 64 blows the compressed air before supplying the compressed air into the container 52. However, the object to be cleaned has a high water repellency or a small gap. In such a case, it is possible to drain the object a to be cleaned with only compressed air.

[0037]

As is apparent from the above description, according to the method of drying parts according to the present invention, the cleaning liquid held in the container having the open bottom and the through hole at the bottom is washed with the cleaning liquid. After cleaning with, the compressed air is supplied to the container to drain the object to be cleaned, so the draining is faster and more reliable than when draining only with the air blown from the blower. This is possible, and the time required to complete the cleaning can be shortened. Further, it is possible to prevent stains from being generated on the surface of the object to be cleaned, and it is possible to enhance the cleaning effect.

Further, by intermittently supplying compressed air into the container, the object to be cleaned is impacted, and the draining time can be shortened and the cleaning property can be further improved.

Further, according to the apparatus for drying parts according to the present invention, the container for accommodating the container, the blowing means for supplying the room temperature air or the heated air, and the compressed air supplying means for supplying the compressed air. Therefore, the liquid draining step and the drying step in the above-described drying method can be performed with a small and compact configuration.

Further, by providing the liquid circulating means for passing the cleaning liquid in the container, the cleaning, draining and drying of the object to be cleaned can be efficiently performed collectively.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a drying device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a drying device according to another embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a conventional drying device.

[Explanation of symbols]

10 Compressed air supply means 12 compressor 14 Air tank 52 container 53 bottom 54 Containment 58 pumps 64 blower 66 heater 70 Liquid circulation means 80 Blowers a Cleaning object

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-328565 (JP, A) JP-A-9-89455 (JP, A) JP-A-6-134420 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) F26B 21/00 B08B 3/04 F26B 7/00 F26B 9/06

Claims (4)

(57) [Claims] 1. A method of drying an object to be cleaned, which is held in a container having an open bottom and a through hole at the bottom, and which has been cleaned with a cleaning liquid, wherein the object to be cleaned has a gap of 20 to 100 μm. Parts with
The compressed air is intermittently blown into the container after being blown by a blower.
And a drying step of supplying heated air into the container after the liquid draining step . 2. The pressure of the compressed air is 0.05 to 2.
The method for drying parts according to claim 1 , wherein the method is 0 MPa. 3. An apparatus for drying an object to be cleaned, which is held in a container having an open bottom and has a through hole at the bottom, and is cleaned with a cleaning liquid, wherein the object to be cleaned has a gap of 20 to 100 μm. Parts with
A kind, supply and housing for supporting inside the volume cylinder has a fan and a heating means, and blowing means for supplying air at room temperature or heated air into the volume cylinder, the compressed air in the volume cylinder Compressed air supply means for blowing air into the vessel by the air blowing means , and then compressing the compressed air.
Compressed air is intermittently supplied by the air supply means.
To supply heated air into the container by the blower.
A device for drying parts that is characterized by: 4. The apparatus for drying parts according to claim 3 , further comprising a liquid circulation means for passing the cleaning liquid into the container and circulating the cleaning liquid outside the container.