JPH0549356B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cleaning device using a flammable solvent, and is intended to safely clean mechanical parts, printed circuit boards, etc. using a flammable solvent. It is something.

Conventional technology Conventionally, fluorocarbon-based solvents were generally used to clean mechanical parts, printed circuit boards, etc. because they are nonflammable, pose no risk of catching fire, and have excellent cleaning power. Its use has become regulated because it is associated with environmental destruction.

Solvents that can replace CFC-based solvents include terpene solvents whose main ingredient is oil extracted from oranges,
Compositions consisting of a mixture of a terpene solvent and a terpene emulsifying surfactant, alcohol, kerosene, and other solvents are considered, but these are all flammable solvents and cannot ensure safety against ignition, so they have not been used in the past. It has become impossible.

Problems to be Solved by the Invention The present invention attempts to solve the above-mentioned problems.It is an object of the present invention to solve the above-mentioned problems. The aim is to prevent damage and to perform safe and continuous cleaning efficiently.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a storage tank containing a non-flammable or flame-retardant storage liquid, and an inlet for the object to be cleaned into the storage liquid of the storage tank. A covering is formed into which the opening at the lower end is inserted, and a cleaning part is formed in the coating chamber covered by the covering to perform cleaning by bringing the object to be cleaned into contact with a flammable solvent. The body is positioned so as to be movable relative to the stored liquid, and the inlet port can be inserted into the stored liquid when not cleaning, and the coating chamber can be sealed with the stored liquid.

Further, the stored liquid may be water.

Further, the stored liquid may be a flame retardant oil with a high boiling point.

Additionally, the flammable solvent may be a terpene solvent.

The flammable solvent may also be a composition comprising a terpene solvent and a terpene emulsifying surfactant.

Moreover, the flammable solvent may be alcohol.

Additionally, the flammable solvent may be kerosene.

Further, the contact between the flammable solvent and the object to be cleaned in the cleaning section may be carried out by spraying the flammable solvent onto the object to be cleaned in the form of a shower.

Further, the coating chamber may be connected to a means for recovering the scattered solvent, and a gas flow may be generated from the inlet of the object to be cleaned toward the inside of the coating chamber.

In addition, the objects to be cleaned are introduced into the coating chamber through the inlet, and the objects to be cleaned are taken out from the coating chamber.
It may also be something that is led out via the stored liquid.

Effect Since the present invention is constructed as described above, when the object to be cleaned is cleaned with the flammable solvent in the cleaning section where the flammable solvent and the object to be cleaned come into contact, the solvent vapor generated by this cleaning is generated. , the scattered droplets remain in the cover, which has an opening at the bottom inserted into the non-flammable or flame-retardant storage liquid, and solvent vapor, droplets, etc. leak outside from the inlet of the object to be cleaned. Since there is no space, the risk of ignition is extremely low unless anything that could cause ignition is placed inside this covering.

In addition, even if some ignition occurs, the opening at the bottom of the covering is inserted into the non-flammable or flame-retardant liquid, and the inlet for the object to be cleaned is slightly opened. , it becomes possible to reduce the risk of ignition. Further, since the coating chamber has an open inlet for introducing the object to be cleaned, it becomes possible to continuously introduce the object to be cleaned at all times, thereby enabling efficient cleaning work.

In addition, the covering body is positioned so that it can move forward and backward relative to the stored liquid, and the inlet port can be inserted into the stored liquid during non-cleaning operations, and the covering chamber can be sealed with the stored liquid, so that when cleaning operations are stopped, This prevents solvent vapor, droplets, etc. from flowing out from the inlet, and allows safe storage of the cleaning equipment.

Moreover, since the coating chamber has an opening for introducing the object to be cleaned, the object to be cleaned can be introduced into the cleaning section of the coating chamber while moving horizontally. Therefore, there is no need for an introduction path through which the stored liquid passes before reaching the cleaning section, and the device can be made smaller.

Moreover, if the stored liquid is water, it is economical and non-flammable, so a high degree of safety against ignition can be obtained.

In addition, if the stored liquid is a flame-retardant oil with a high boiling point, when using a solvent that dissolves in water such as alcohol, it is possible to prevent the solvent from dissolving in the stored liquid and prevent the stored liquid from becoming flammable. Unlike water, there is no loss of weight due to evaporation, and rust can be prevented from occurring on the parts used.

Further, the flammable solvent may be a terpene solvent, a composition consisting of a terpene solvent and a terpene emulsifying surfactant, alcohol, or kerosene. , any flammable solvent can be used depending on the cleaning purpose.

In addition, if the flammable solvent comes into contact with the object to be cleaned in the cleaning section by spraying the flammable solvent onto the object to be cleaned in the form of a shower, it becomes possible to powerfully clean the entire object to be cleaned. .

In addition, by connecting a means for collecting scattered solvent to the coating chamber, it is possible to reduce the concentration of flammable solvent vapor and droplets in the coating chamber, further reducing the risk of ignition. At the same time, by using this recovery means to generate a gas flow from the inlet of the object to be cleaned toward the inside of the coating chamber, safe cleaning can be achieved by preventing the flow of flammable solvent vapor and splashes from the inlet. enable work.

In addition, the objects to be cleaned are introduced into the coating chamber through the inlet, and the objects to be cleaned are taken out from the coating chamber.
If the liquid is discharged through the stored liquid, it becomes possible to continuously and efficiently clean the object while preventing the diffusion of flammable solvent vapor and droplets.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a storage tank which stores a flame-retardant storage liquid 2 such as non-flammable water or flame-retardant oil with a high boiling point.
If water is used as the stored liquid 2, it is economical and non-flammable, so that a high degree of safety can be obtained in the cleaning operation.

Furthermore, if the stored liquid 2 is a flame-retardant oil such as heat transfer oil with a high boiling point, cutting oil, or spindle oil, when using a flammable solvent 3 that dissolves in water such as alcohol, the flammable solvent 3 It is possible to prevent dissolution into the stored liquid 2, prevent the stored liquid 2 from becoming flammable, and prevent weight loss due to evaporation like water, rusting of metal members, etc.

In addition, a covering body 7 is formed in the storage liquid 2 of the storage tank 1, and the opening 4 at the lower end is inserted except for the inlet 6 for the object to be cleaned 5. A covering chamber 8 is provided in the covering body 7. A cleaning section 10 is formed in which the flammable solvent 3 and the object to be cleaned 5 are brought into contact.

The flammable solvent 3 is not particularly limited as long as it meets the purpose of cleaning, but for example, in order to clean flux residue from a printed circuit board, a terpene solvent or a terpene solvent and a terpene emulsion surfactant may be used. A composition consisting of is preferred. Further, as the flammable solvent 3, any flammable solvent such as alcohol or kerosene can be used depending on other cleaning purposes.

Further, the above-mentioned covering body 7 may be one in which the opening 4 is inserted immovably into the stored liquid 2, but in the embodiment shown in the drawings, the upper surface of the storage tank 1 is covered with the covering body 7. It is covered with a casing 11.
A cylinder rod 13 of a cylinder 12 fixed to the upper surface of the casing 11 is connected to the cover 7 through the casing 11, so that the cover 7 can be moved up and down.

In order to wash the object 5 to be cleaned, the cover 7 is raised as shown in FIG. 1, and the inlet 6 of the object 5 to be cleaned is brought into an open state where it is not in contact with the stored liquid 2. Further, the opening 4 at the lower end of the covering body 7 is inserted into the stored liquid 2 to enable continuous introduction of the object to be cleaned 5 into the cleaning section 10, thereby performing the cleaning operation.

Further, the casing 11 facing the introduction port 6 has an insertion port 14 for the object to be cleaned 5, and an insertion conveyor 15 is installed to facilitate introduction of the object to be cleaned 5 into the introduction port 6.

Further, in the coating chamber 8 within the coating body 7, a transfer conveyor 16 is located on the same plane as the insertion conveyor 15. A chain conveyor 17 is positioned by a sprocket wheel 18 so as to face the end of the transfer conveyor 16 in the transfer direction. Derived as follows. A water shower 20 for removing the flammable solvent 3 adhering to the object 5 to be cleaned is installed in this outlet section.

Furthermore, a primary removal section 22 is provided in the stored liquid 2 in front of the flush shower 20 for sucking and pressurizing the stored liquid 2 with a pump 21 and spraying it onto the object 5 to be cleaned. The object to be cleaned 5 that has passed through the primary removal section 22 is then passed through the filtering means 23 to the stored liquid 2.
Secondary cleaning is performed using a water-washing shower 20 that has been cleaned.

Note that the purpose of cleaning the object 5 to be cleaned by the water shower 20 and the primary removal section 22 is to remove the flammable solvent 3 adhering to the object 5 to be cleaned. This is preferably carried out when water is used in step 2.

Further, a delivery conveyor 24 is located in the direction in which the objects 5 to be cleaned are taken out of the flush shower 20, and this delivery conveyor 24 protrudes from a delivery port 25 provided in the casing 11, thereby making it possible to take out the objects 5 to be washed. .

Further, the cleaning section 10 within the covering body 7 is located so that the receiving tray 26 for the flammable solvent 3 faces the lower surface of the covering body 7 . Further, the shower 27 is positioned so as to face both the upper and lower surfaces of the object 5 to be cleaned passing through the upper part of the tray 26. Then, the flammable solvent 3 in the filling tank 28 installed in the stored liquid 2 is pressurized and supplied to the shower 27 by the pump 30, and the shower 27 sprays the flammable solvent 3 from both the upper and lower surfaces for cleaning. be. With this configuration, the object 5 to be cleaned can be cleaned with a simple mechanism, and the object 5 to be cleaned can be washed continuously.

Further, the cleaning of the object 5 to be cleaned does not necessarily need to be carried out using a shower, but it is of course possible to use immersion cleaning in which the object 5 is immersed in a cleaning liquid made of a flammable solvent.

In addition, solvent vapor, scattered droplets, etc. generated by the above-mentioned cleaning work remain in the covering body 7, which is covered by inserting the opening 4 at the lower end into the non-flammable or flame-retardant storage liquid 2. There is very little chance of leakage. Therefore, if nothing that could cause ignition is placed inside this covering 7, the risk of ignition is almost eliminated. Further, even if some ignition occurs, the opening 4 at the lower end of the covering 7 is covered with the nonflammable or flame-retardant liquid 2, so the risk of ignition can be reduced.

Furthermore, if a collection means 31 for recovering steam, scattered solvent droplets, etc. is connected to the coating chamber 8 in the coating body 7, the concentration of vapor, splashes, etc. of the flammable solvent 3 in the coating chamber 8 can be reduced. This makes it possible to further reduce the risk of ignition.

The recovery means 31 connects a suction pipe 33 with a suction port 32 protruding from the upper part of the coating chamber 8 to the recovery tank 3.
It is connected to the condensation chamber 35 of No. 4, and vapor introduced from the suction pipe 33, splashes of scattered solvent, etc. are condensed by a flowing liquid layer 37 formed by a cooling liquid 36, and separated from the condensation chamber 35 by a partition wall 38. 38
A discharge pipe 43 is connected to an upper space 42 of a cooling liquid chamber 41 provided by inserting a communication port 40 into the cooling liquid 36. By circulating the clean gas in the upper space 42 into the coating chamber 8 through the inlet 6 of the object to be cleaned 5, the concentration of vapor, droplets, etc. of the flammable solvent 3 in the coating chamber 8 is significantly reduced, and the gas is introduced. It is possible to generate a gas flow from the port 6 toward the inside of the coating chamber 8, to prevent solvent vapor, droplets, etc. from flowing out from the inlet 6, and to reliably prevent the risk of ignition.

Further, as mentioned above, it is not necessarily necessary to use the condensation mechanism to recover the vapor, droplets, etc. of the flammable solvent 3, and any other recovery device may be used.
For example, as in a mist catcher, solvent vapor,
The droplets may be sucked by the suction force of a fan and filtered by a filter. In this case, since the suction of solvent vapor, droplets, etc. and the flow of filtered gas can be performed with a large force, a sufficient gas flow is generated from the inlet 6 into the coating chamber 8, and the solvent vapor, droplets, etc. from the inlet 6 are removed. It becomes possible to prevent leakage more reliably.

In addition, after the cleaning work is completed, this casing 11
actuate the cylinder 12 fixed on the top surface of the second
As shown in the figure, if the covering body 7 is lowered, the inlet 6 is inserted into the stored liquid 2, and the coating chamber 8 is sealed with the stored liquid 2, solvent vapor and splashes from the inlet 6 can be prevented when the cleaning operation is stopped. etc., and enables safe storage of the cleaning equipment.

Effects of the Invention Since the present invention is configured as described above, it is possible to ensure that solvent vapor generated during cleaning, scattered droplets, etc. do not leak to the outside from the covering whose lower end opening is closed with the liquid contained therein. , the risk of ignition caused by sparks from external devices, static electricity, etc. is eliminated.

Furthermore, even if some ignition occurs, the risk of ignition can be reduced by using a non-flammable or flame-retardant stored liquid.

Further, during cleaning work, since the inlet for the objects to be cleaned is opened, the objects to be cleaned can be continuously introduced, making it possible to carry out continuous and efficient cleaning operations. In addition, if the inlet is kept to the minimum necessary for introducing the items to be cleaned such as printed circuit boards, the outflow of solvent vapor and splashes will be extremely small.
There is almost no risk of ignition.

In addition, since the coating chamber has an open inlet for the object to be cleaned, the object to be cleaned can be introduced into the cleaning section of the coating chamber while moving horizontally, and the introduction path through which the stored liquid passes before reaching the cleaning section. is no longer necessary. Therefore, the device can be downsized.

Furthermore, if water is used as the liquid to be stored, it is economical and non-flammable, so a high degree of safety can be achieved.

In addition, if the stored liquid is a flame-retardant oil with a high boiling point, when using a solvent that dissolves in water such as alcohol, it is possible to prevent the solvent from dissolving in the stored liquid and prevent the stored liquid from becoming flammable. Unlike water, there is no loss of weight due to evaporation, and rust can be prevented from occurring on the parts used.

Further, if the flammable solvent and the object to be cleaned are brought into contact in the cleaning section by spraying the flammable solvent in a shower, it becomes possible to powerfully clean the entire object to be cleaned.

Furthermore, if a means for collecting scattered solvent is connected to the coating chamber, it is possible to reduce the concentration of flammable solvent vapor, droplets, etc., and further reduce the risk of ignition. In addition, if this recovery means generates a gas flow from the inlet of the object to be cleaned toward the inside of the coating chamber, the vapor of the flammable solvent from the inlet,
Prevents the outflow of droplets and enables safe cleaning work.

In addition, the objects to be cleaned are introduced into the coating chamber through the inlet, and the objects to be cleaned are taken out from the coating chamber.
If the liquid is discharged through the stored liquid, it becomes possible to continuously wash the object while preventing the diffusion of flammable solvent vapor and droplets.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional view showing a cleaning state of an object to be cleaned, and FIG. 2 is a cross-sectional view of a non-cleaning operation state in which the coating chamber is sealed. DESCRIPTION OF SYMBOLS 1...Storage tank, 2...Stored liquid, 3...Flammable solvent, 4...Opening, 5...Object to be cleaned, 6...Inlet, 7...Coating, 8...Coating chamber, 10...Cleaning section, 31...Recovery means.

Claims (1)

[Scope of Claims] 1. A covering body which is provided with a storage tank containing a non-flammable or flame-retardant storage liquid, and into which the opening at the lower end of the storage tank is inserted, excluding the inlet for the object to be cleaned. A cleaning section is formed in the coating chamber covered by the coating body, and the cleaning part is formed in which the flammable solvent and the object to be cleaned are brought into contact with each other for cleaning. A cleaning device using a flammable solvent, characterized in that the inlet can be inserted into the stored liquid during non-cleaning operations, and the coating chamber can be sealed with the stored liquid. 2. The cleaning device using a flammable solvent according to claim 1, wherein the stored liquid is water. 3. The cleaning device using a flammable solvent according to claim 1, wherein the stored liquid is a flame-retardant oil with a high boiling point. 4. The cleaning device using a flammable solvent according to claim 1, wherein the flammable solvent is a terpene solvent. 5. The cleaning device using a flammable solvent according to claim 1, wherein the flammable solvent is a composition comprising a terpene solvent and a terpene emulsifying surfactant. 6. The cleaning device using a flammable solvent according to claim 1, wherein the flammable solvent is alcohol. 7. The cleaning device using a flammable solvent according to claim 1, wherein the flammable solvent is kerosene. 8. The cleaning device using a flammable solvent according to claim 1, wherein the contact between the flammable solvent and the object to be cleaned in the cleaning section is carried out by spraying the flammable solvent onto the object to be cleaned in a shower-like manner. . 9 A means for collecting scattered solvent is connected to the coating chamber,
2. The cleaning device using a flammable solvent according to claim 1, wherein a gas flow is generated from an inlet for the object to be cleaned toward the inside of the coating chamber. 10. The flammable solvent according to claim 1, wherein the object to be cleaned is introduced into the coating chamber through an inlet, and the object to be cleaned is taken out from the coating chamber via the stored liquid. Cleaning equipment.