JPH05329452A - Dual structure exhaust hood for multi-tank organic solvent washer - Google Patents

Abstract

(57) [Summary] [Purpose] The exhaust volume of the exhaust system is relatively small, and the amount of organic solvent released to the outside of the double hood is suppressed. [Structure] The cleaning tank body 4 is doubly covered with an inner cover 1 and an outer cover 2. The work 3 is gripped by the gripping means (not shown) of the transfer device 6, conveyed as indicated by an arrow, and sequentially dipped in the organic solvent liquid in the first cleaning tank 4a and the second cleaning tank 4b to perform the primary cleaning. Cleaning and second
After performing the next cleaning, it is immersed in the organic solvent vapor bath in the third cleaning tank 4c for cleaning. The inner cover 1 has a passage 1f through which a carry-in notch 1c for carrying in and out a work 3, a carry-out notch 1d, an arm of the gripping means, and the like pass.
Most of the other parts cover the opening 4d of the cleaning tank body 4 to prevent the organic solvent vapor from flowing out of the inner cover 1 into the outer cover 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual structure exhaust hood attached to a multi-tank type organic solvent cleaning machine for cleaning an article to be cleaned with an organic solvent.

[0002]

2. Description of the Related Art Conventionally, in a multi-tank type organic solvent washer of this type, an opening of a tank main body is covered with a large-volume single exhaust hood, and articles to be cleaned are carried into and out of the single exhaust hood. The opening is formed and an escape portion is provided so as not to prevent the operation of the transfer device for transferring the article to be cleaned, thereby ensuring workability of the cleaning work.

[0003]

The above-mentioned prior art has the following problems because the single exhaust hood has a large volume.

(1) In order to satisfy the permissible concentration of organic solvent vapor outside the exhaust hood, it is necessary to install an exhaust device having a large exhaust amount. By the way, in the case of 1-1-1 trichloroethane, the waterfall concentration around the washing machine is 200 ppm or less (exhaust hood opening) / (exhaust wind velocity near the hole 0.4 m
/ Sec or more), the exhaust device becomes large.

(2) As a result of the above (1), a large amount of the organic solvent vapor above the cleaning tank is exhausted as exhaust gas, so that the amount of the organic solvent used becomes large.

(3) Generally, a recovery device for recovering the organic solvent from the exhaust gas of the exhaust device is not provided, and a large amount of unrecovered organic solvent is released into the atmosphere.

The present invention has been made in view of the above-mentioned problems of the prior art. The exhaust amount of the exhaust device can be relatively small, and the amount of the organic solvent released to the outside of the double hood can be reduced. It is an object of the present invention to realize a dual structure exhaust hood for a multi-tank organic solvent washer that can be suppressed.

[0008]

In order to achieve the above object, a dual structure exhaust hood of a multi-tank type organic solvent cleaning machine of the present invention has a plurality of organic solvent cleaning tanks provided inside the tank body. In a multi-tank organic solvent washer, an inner cover that covers the opening of the tank main body, an outer cover that covers at least the periphery of the inner cover, and an exhaust duct that communicates with an appropriate portion of the outer cover are provided. It is a feature.

Further, the inner cover has a notch for carrying in the article to be cleaned grasped by the grasping means of the carrying device and a notch for taking out the article to be cleaned, and one of the grasping means is provided between the notches. It is more effective when the passage through which the parts can pass is opened or when at least one cleaning tank is an organic solvent vapor bath.

[0010]

Most of the organic solvent vapor accumulated in the upper part of the tank body is captured by the inner cover. Therefore, a small amount of the organic solvent vapor flows into the outer cover from the cutout portion or passage of the inner cover, and the amount of the organic solvent vapor released from the outer cover to the outside is greatly suppressed.

[0011]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic sectional view of an embodiment of the present invention,
2 is a schematic cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is an exploded partial perspective view showing the relationship between the tank body and the inner cover of the embodiment shown in FIG.

The lower half of the tank body 4 is partitioned into a plurality of organic solvent cleaning tanks, that is, a first cleaning tank 4a, a second cleaning tank 4b, and a third cleaning tank 4c, and an upper half thereof has partition walls. A common chamber is provided instead of the common chamber, and a cooling pipe 5 through which cooling water or the like passes is disposed on the wall surface of the common chamber.

The first cleaning tank 4a and the second cleaning tank 4b are filled with an organic solvent, and the third cleaning tank 4c is introduced into the bottom wall of the third cleaning tank 4c to heat it to evaporate a small amount of the organic solvent. Are arranged.

The opening 4d of the tank main body 4 is covered with an inner cover 1 having a shape described later, and the outer portion of the inner cover 1 and the tank main body 4 is an outer cover in which a duct 7 as an exhaust port is connected to the upper wall. It is covered with 2. A known transfer device 6 is disposed in the space between the outer cover 2 and the inner cover 1, and the transfer device 6 is provided with a gripping means (not shown) for gripping the workpiece 3 as the article to be cleaned. There is.

The work 3 is placed on a carry-in table 8 (which may be a conveyor or the like), which is gripped by the gripping means of the transfer device 6 and sequentially transferred as shown by the arrow in FIG.
After positioning and cleaning in the first cleaning tank, the second cleaning tank and the third cleaning tank, they are placed on the carry-out table 9 (may be a conveyor or the like).

Next, the structure of the inner cover 1 will be described with reference to FIGS. 2 and 3.

The inner cover 1 has a rectangular opening, and a protrusion 1b which is airtightly fitted into the opening 4d of the tank body 4 is provided around the opening on the lower surface side. An upper cover member 1a is provided on the upper surface side.

The upper cover member 1a has a generally shed-like shape, and the upper surface 1e corresponding to the roof of the shed is liquefied by forming an inclined surface having a downward slope from the central portion in the longitudinal direction toward the left and right side walls. The organic solvent is made to easily flow down along the inclined surface. Further, a notch 1c for carrying in for carrying in the work 3 and a notch 1d for carrying out for carrying out the work 3 are respectively formed from both end surfaces in the longitudinal direction of the upper cover member 1a to the upper surface 1e, and the notch for carrying in 1c. And carry-out notch 1
A slit-shaped passage 1f for passing an arm or the like, which is a part of the gripping means of the transport device gripping the work 3, is formed between the slit 1d and d.

Since the inner cover 1 is constructed as described above, the opening 4d of the tank body 4 is covered by hermetically fitting the projection 1b on the lower surface thereof into the opening 4d of the tank body 4. It has a function of suppressing the organic solvent vapor in the tank body 4 from flowing into the outer cover 2. Therefore, the carry-in notch 1c and the carry-out notch 1d
The opening area of the passage 1f and the passage 1f is preferably as small as possible without impairing their functions.

Next, the operation of this embodiment will be described.

As shown in FIG. 1, the work 3 placed on the carry-in table 8 is gripped by a gripping means (not shown) of the transfer device 6 and is transferred in the direction of the arrow, and the first is filled with the organic solvent liquid. It is immersed in the cleaning tank 4a for primary cleaning. Then, the work 3 that has been subjected to the primary cleaning is conveyed to the second cleaning tank 4b, which is also filled with the organic solvent, as shown by the arrow, and is immersed again to perform the secondary cleaning. By this primary and secondary cleaning, most of the dirt attached to the work 3 due to water, oil or various substances is cleaned and removed, and the constituents of the dirt are dissolved or mixed in the organic solvent liquid.

After that, the work 3 which has been subjected to the primary and secondary cleaning is conveyed along the arrow and moved into the third cleaning tank 4c. The third cleaning tank 4c is charged with a small amount of organic solvent,
This is heated by the heater 10 to be evaporated, and most of the third cleaning tank 4c is used as an organic solvent vapor bath of organic solvent vapor,
The work 3 is immersed in the organic solvent vapor bath for cleaning. The organic solvent vapor staying in the upper portion of the tank body 1 is cooled by the cooling pipe 5, liquefied and falls.

In the third cleaning tank 4c, only the organic solvent having a low boiling point evaporates due to the difference in boiling point between the stain component and the organic solvent, and the organic solvent vapor bath does not contain the stain component. The work 3 is always exposed to clean organic solvent vapor to be cleaned.

Next, the third-cleaned work 3 is conveyed along the arrow and placed on the unloading table 9.

Incidentally, as the organic solvent used in the present invention, there are 1-1-1 trichloroethane, dichloromethane and the like which are generally used for cleaning parts.

Table 1 shows the physical properties of 1-1-1 trichloroethane and dichloromethane.

[0028]

[Table 1] When 1-1-1 trichloroethane is used, the heating temperature by the heater of the third cleaning tank is set to (0 to +3) ° C. higher than the boiling point temperature, and the temperature of the cooling liquid in the cooling pipe is the inlet side temperature. 21 ~ 22 ℃ outlet side temperature 24 ~
It is better to set it to about 25 ° C.

The overall shape of the inner cover and the shapes of the carry-in notch portion, the carry-out notch portion and the passage are not limited to those shown in the above embodiment, and may be appropriately selected according to the shape of the work and the structure of the gripping means of the conveying device. Although the shape can be formed, it is preferable to make the opening area of the organic solvent vapor as small as possible in order to suppress the outflow of the organic solvent vapor from the inner cover to the outer cover.

In addition, the outer cover does not need to surround the entire washing machine or the entire transporting device when the airtightness is maintained, and may be one in which at least only the periphery of the inner cover is partially surrounded. It should be noted that when the whole is surrounded by an outer cover, it is advisable to provide a door or a window for maintenance and inspection of the main body of the washing machine and the transfer device. In addition, the ultrasonic cleaning section 11 can be disposed in the lower part of the second tank as the liquid bath vibration cleaning by the ultrasonic oscillator.

Further, the inner cover does not necessarily have to be detachable from the tank body, but in the case of being detachable, the following may be done.

(1) If the inner cover is misaligned due to vibrations or the like, it may interfere with the conveying device or the article to be cleaned. To prevent this, the inner cover is fitted in the opening of the cleaning tank body in an airtight manner. A guide rail for fitting is provided so that it can be installed.

(2) A pin is provided on one of the inner cover and the peripheral portion of the opening of the cleaning tank body, and a hole into which the pin is fitted is formed on the other.

(3) In addition to the above (1) and (2), the inner cover can be detachably fixed to the cleaning tank body with a screw or the like.

[0035]

Since the present invention is configured as described above, it has the following effects.

The organic solvent vapor accumulated in the upper part of the tank body is
Most of it is captured by the inner cover. Therefore, the amount of organic solvent vapor flowing from the inner cover to the outer cover is small, and the loss of organic solvent due to being discharged from the outer cover to the outside of the double hood through the exhaust duct etc. is greatly reduced. To do.

Since the amount of organic solvent vapor discharged to the outside of the outer cover through the exhaust duct is small,
The suction amount of the exhaust duct can be reduced to the permissible waterfall concentration outside the outer cover. As a result, the load is reduced when the exhaust device is provided with an organic solvent vapor recovery device, and even when the recovery device is not attached, the amount of organic solvent vapor released into the atmosphere is reduced. The amount released is significantly reduced.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of a dual structure exhaust hood of a multi-tank organic solvent washer of the present invention.

FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG.

FIG. 3 is a schematic partial perspective view showing the relationship between the inner cover and the tank body of the embodiment shown in FIG.

[Explanation of symbols]

 1 Inner Cover 1a Upper Cover Member 1b Projection 1c Carrying In Notch 1d Carrying Out Notch 1e Upper Surface 1f Passage 2 Outer Cover 3 Work 4 Tank Body 4a 1st Cleaning Tank 4b 2nd Cleaning Tank 4c 3rd Cleaning Tank 5 Cooling Pipe 6 Transport device 7 Duct 8 Carry-in stand 9 Carry-out stand

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Yonezawa 3-2-8 Okai, Hirosaki City, Aomori Prefecture (72) Inventor Yoshinori Kudo Hirosaki City, Aomori Prefecture Oguriyama character Kawai 119-23

Claims (4)

[Claims] 1. A multi-tank type organic solvent cleaning machine in which a plurality of organic solvent cleaning tanks are provided inside a tank main body, an inner cover for covering an opening of the tank main body, and an outer cover for covering at least the periphery of the inner cover. A dual structure exhaust hood for a multi-tank type organic solvent washer, comprising a cover and an exhaust duct communicating with appropriate portions of the outer cover. 2. The inner cover has a notch for loading and unloading an article to be cleaned gripped by the gripping means of the transporting device, and one of the gripping means is provided between the notches. The dual structure exhaust hood of a multi-tank type organic solvent cleaning machine according to claim 1, wherein a passage through which the portion can pass is opened. 3. The dual structure exhaust hood of a multi-tank type organic solvent cleaning machine according to claim 1, wherein at least one organic solvent cleaning tank is an organic solvent vapor bath. 4. The size of the space formed by the tank body and the inner cover is such that an article to be cleaned can be transported in the space. A dual structure exhaust hood for a multi-tank organic solvent washer.