JP3522946B2 - Cleaning equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shower cleaning zone in which a cleaning liquid is sprayed on a work conveyed by a conveyor in a tunnel type cleaning chamber. The present invention relates to a cleaning device provided with an air blow device for spraying water droplets attached to the surface of the cleaning device. 2. Description of the Related Art In a pre-treatment for coating plastic parts and other cleaning equipment, the cleaning effect is excellent, and after cleaning, it is dried as it is, so that the cleaning equipment is designed to be compact. Chlorine-based cleaning liquids such as trichloroethylene and trichloroethane have been used because of their many advantages, such as the ability to be used. Cleaning solution such as 50 ° C. or higher (for example,
(5 ° C.) and sprayed onto the work for cleaning. As a result, the cleaning effect has been improved to the same extent as that of the chlorine-based cleaning solution, but the drying property is inferior to that of the chlorine-based cleaning solution. Since the droplets are not easily dried, an air blow device is provided after the shower cleaning zone, which is provided with an air nozzle that blows air over the entire surface of the work and a suction port that sucks air blown out from the air nozzles. They are forced to wipe away. [0004] However, when air is blown by an air blow device to wipe liquid droplets, a sufficient amount of air must be blown to wipe the entire surface of the work. In addition to the necessity of a blower, when a large amount of air is blown out of the air blow device, all the air cannot be completely sucked from the suction port, and an air flow toward the inlet / outlet of the cleaning chamber is formed. There was a problem that air containing droplets leaked out of the chamber. In addition, since the existing cleaning equipment for a coating line is designed on the premise of cleaning with a chlorine-based cleaning liquid, the total length of the cleaning chamber in which the cleaning equipment is installed is short, and a new coating line is designed. In this case as well, when the factory area is limited, the total length of the cleaning chamber must be shortened.Therefore, it is extremely difficult to form a suction port in the middle of the cleaning chamber and suck out the airflow toward the entrance from the middle of the cleaning chamber. Difficult. In this case, if the air volume of the blower is reduced, the amount of leakage from the entrance and exit of the cleaning chamber to the outside can be reduced, but in this case, the work cannot be sufficiently dried. Therefore, the present invention reduces the amount of leakage from the entrance of the cleaning chamber to the outside, and
It is a technical object to sufficiently wipe off the droplets attached to the surface of the work. SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a method for cleaning a workpiece conveyed by a conveyor in a tunnel type cleaning chamber at a later stage of a shower cleaning zone for cleaning the workpiece by spraying the cleaning liquid. A cleaning device provided with an air blow device for blowing air to a surface of a work to dry the surface, wherein the air blow device is a top surface air knife nozzle for squeezing and blowing air from a ceiling side to a top surface of the work in a film form. And, a side air knife nozzle for squeezing and blowing air to the side surface of the work from both the left and right sides in a film shape is installed at a predetermined distance from front to back, and an air duct for supplying air to each of the air knife nozzles has a switching damper. Through the air blower, and only when the workpiece passes through the air blowing position of the side air knife nozzle. Control for selectively switching each air duct by the switching damper so that air is supplied to the knife knife and air is supplied to the air knife nozzle for the upper surface except when air is supplied to the air knife nozzle for the side surface. A device is provided. [0007] According to this, the upper surface air knife nozzle that blows film-like air to the upper surface of the work and the side air knife nozzle that blows film-like air to the side surface of the work are displaced forward and backward by a predetermined distance. For example, if the upper surface air knife nozzle is installed on the near side, the work that has been shower-washed in the shower washing zone firstly has a liquid adhered to its upper surface by air blown out from the upper surface air knife nozzle. Drops are wiped away. Next, when the workpiece reaches the air blowing position of the side air knife nozzle, the switching damper is switched to stop the air blowing from the upper air knife nozzle, and at the same time, start the air blowing from the side air knife nozzle. In the method, droplets attached to the side surface of the work are wiped off. Then, when the work passes the air blowing position of the side air knife nozzle, the air blow duct is switched again by the switching damper, and the air is blown out of the upper air knife nozzle. As described above, for example, if the air knife for the upper surface is installed on the near side and the air knife for the side is installed on the subsequent stage, and it is shifted by a predetermined distance back and forth,
As the work is transported, air is sequentially blown out from each air knife nozzle, so that droplets on the upper surface and side surfaces of the work are wiped off. In addition, the air knife nozzle for the upper surface and the air knife nozzle for the side surface, air is blown out from only one of them, and both are not blown out at the same time, so compared to the case where air is simultaneously sent to both air knife nozzles, The amount of air blown by the blower can be halved without reducing the wind speed of the air blown out from each air knife nozzle. Therefore, the droplets adhered to the surface of the work are reliably wiped off, and furthermore, the amount of air blown into the cleaning chamber is reduced, so that the airflow toward the entrance and exit of the cleaning chamber is weakened, and the droplets containing the cleaning liquid are contained. Almost no air leaks out of the cleaning chamber. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings. FIG. 1 is a side view showing an example of the configuration of a cleaning apparatus according to the present invention, and FIG. 2 is a plan view thereof. The cleaning apparatus 1 of this embodiment is for performing pre-treatment, for example, for coating a plastic part. The cleaning apparatus 1 is installed in a tunnel type cleaning chamber 3 provided with a draining / drying furnace 2 at the subsequent stage, and a conveyor 4 is provided. For the workpiece W conveyed by
For example the concentration of 20%, a degreasing shower washing zone Z ₁ shower nozzle 5 ... is arranged to degreasing by spraying the liquid temperature 75 ° C. of emulsion washing liquid, spraying the concentration 200 ppm, liquid temperature 65 ° C. dilute emulsion washing liquid rinsing shower washing zone Z ₂ shower nozzle 7 for spraying the shower nozzle 6 ... and deionized water is arranged is formed along the conveying direction, each shower washing zone Z ₁ and Z
The ₂ in the subsequent stage, air blow device A ₁ and A ₂ for drying is wiping the droplets adhered by blowing air on the surface of the workpiece W on the surface, which are respectively disposed. In the air blow devices A ₁ and A ₂ , an upper surface air knife nozzle 8 for squeezing air from the ceiling to the upper surface of the work W in a film shape and spraying the film is installed on the front side.
Laterally, a side air knife nozzle 9 that shifts the position by a predetermined distance to the side of the work W and squeezes air from the left and right side walls to the side surface of the work W in a film shape and installs the film is sucked. A suction port 10 is formed in a side wall and a ceiling of the cleaning chamber 3. Also,
A blower 11 for circulating and supplying air sucked from the suction port 10 to the air knife nozzles 8 and 9 is connected to the air knife nozzles 8 and 9 via air ducts 12 and 13 and a branch portion of the air ducts 12 and 13. Is provided with a switching damper 14, and the switching damper 14 selectively connects the air knife nozzles 8, 9 to the blower 11 so that air is blown out from one of the air knife nozzles 8, 9. ing. Reference numeral 15 denotes a control device for operating the switching damper 14 to switch the air ducts 12 and 13 in accordance with the transfer of the workpiece W. Air is supplied to the input side by the air knife nozzles 8 and 9. a position sensor S ₁ for detecting that the workpiece W has arrived in front of the spraying is air blowing area B, the position sensor S ₂ for detecting that the workpiece W has arrived on the air blowing position of the side surface air knife nozzle 9
When, together with the workpiece W is connected to the position sensor S ₃ for detecting that has passed through the other words the air blowing area B has passed through the air blowing position of the side surface air knife nozzle 9,
A motor 16 for performing a switching operation of the switching damper 14 on the output side
And an automatic stopper 17 for stopping the work W conveyed by the conveyor 4 just before the air blow area B is connected. The conveyor 4 is of a power and free type in which a power chain 19 is removably engaged with a traveling vehicle 18 to which a hanger H is attached. The power chain 19 is disengaged from the traveling vehicle 18 when the traveling vehicle 18 is locked, and the power chain 19 is engaged with the traveling vehicle 18 when the auto stopper 17 is released. The automatic stopper 17 is provided with a control device 15.
The control device 15 determines whether there is a preceding work W in the air blow area B based on the detection signals of the position sensors S ₁ and S ₃ . Then, only when there is no preceding work W, the automatic stopper 17 is released and the traveling carriage 18 is caused to travel to carry the succeeding work W into the air blow area B. Otherwise, the stopper 17 is locked. Keep it. When the position sensor S ₂ detects that the workpiece W has reached the air blowing position of the side air knife nozzle 9, the control device 15 operates the switching damper 14 to connect the air duct 13 to the blower 11. and communicated to deliver air to the side air knife nozzle 9, when the workpiece W is detected to have passed the air blowing position of the side surface air knife nozzle 9 by a position sensor S _3, operating the switching damper 14 again Thus, the air duct 12 is communicated with the blower 11 to supply air to the upper air knife nozzle 8. Reference numeral 20 denotes an exhaust port provided at the entrance of the tunnel type cleaning chamber 1. The above is an example of the configuration of the present invention, and its operation will now be described. First, the shower washing zone Z ₁ and each emulsion washing liquid to each shower nozzle 5, 6, 7 of Z _2, dilute emulsions cleaning liquid, by supplying pure water, and then blowing the cleaning liquid from the shower nozzles 5, 6 and 7 respectively At the same time, the air blowers 11 of the air blow devices A ₁ and A ₂ are activated to blow out film-like air from the upper air knife nozzle 8. At this time, each with air curtain is formed by the air blown a membrane from the upper surface air knife nozzle 8 shower washing zone Z ₁ and Z ₂
Since it is partitioned, or is taken out to the shower washing zone Z ₂ of the subsequent high cleaning liquid droplets of blown concentrations in the shower washing zone Z ₁ is shed wind, also blown later shower washing zone Z ₂ The droplets of the cleaning liquid thus removed are not taken out to the subsequent draining / drying furnace 2. [0017] Here, when to start the conveyor 4 starts transfer of the workpiece W, the workpiece W is transported to a degreasing shower washing zone Z _1, concentration of 20% is blown liquid temperature 75 ° C. the emulsion washing liquid Degreased and washed, then
Droplets of the surface is wiped by the air is blown by the air blowing device A _1. Then, the concentration 200ppm by rinsing shower washing zone Z _2, after being blown dilute emulsions wash liquid temperature 65 ° C., purified water is sprayed, emulsion cleaning liquid adhering to the surface is removed cleanly,
Thereafter, the droplets of the surface is blown again air by air blow device A ₂ is wiped cleaning process is completed. In each of the air blow devices A ₁ and A ₂ , when the work W arrives before the air blow area B, first, the control device 15 controls the air blow area B.
It is determined whether or not there is a preceding work W. If there is a preceding work W, the succeeding work W is stopped by the automatic stopper 17 and stored at that location. 17 is released, and it is carried into the air blow area B by the conveyor 4 as it is. This determination is made based on the detection signals of the position sensors S ₁ and S _{3. If} the detection signal of the position sensor S ₃ is not output after the detection signal of the position sensor S ₁ is output, the air blow area B preceding workpiece W is determined to be within, it is determined that the work W prior from the air blowing area B is carried out when it is output detection signal of the position sensor S ₃ is. At this time, the air blow devices A ₁ and A _{1
In 2} , the air duct 12 connected to the upper surface air knife nozzle 8 is connected to the blower 11 via the switching damper 14, so that the air is narrowed and blown out from the upper surface air knife nozzle 8 in a film form. As the work W is transported, air is blown from the upper surface air knife nozzle 8 to the work W, and the liquid droplets adhering to the upper surface are wiped off. [0020] then be conveyed work W by the conveyor 4, when arriving at the air blowing position of the side surface air knife nozzle 9, switch damper 14 is operated by the control unit 15 is output the detection signal of the position sensor S _2, At the same time as the air duct 12 connected to the air knife nozzle 8 for the upper surface is shut off, the air duct 13 connected to the air knife nozzle 9 for the side surface is conducted to the blower 11, so that the film-shaped air blows out from the air knife nozzle 9 for the side surface. Is done. Therefore, as the work W is transported, air is blown from the side air knife nozzle 9 to the work W, so that moisture adhering to the side is wiped off and dried. The air duct 12 connected to the air knife nozzle 8 for the upper surface and the air duct 13 connected to the air knife nozzle 9 for the side surface are alternately switched by a switching damper 14, and any one of the air knife nozzles 8 and 9 is used. Since air is blown out from only one side and not both at the same time, the blower 11 needs only half the amount of air blown to both air knife nozzles 8 and 9 at the same time. Therefore, not only the small size of the blower 11 is sufficient, but also the amount of air blown into the tunnel-type cleaning chamber 3 is reduced, whereby the air flow toward the entrance and exit of the cleaning chamber 3 is weakened, and the cleaning liquid is reduced. The air containing the drops hardly leaks out of the cleaning chamber 3. As described above, according to the present invention, the air knife nozzle for the upper surface and the air knife nozzle for the side surface are installed at predetermined intervals in the forward and backward directions, and each air knife nozzle is moved in accordance with the transfer of the work. Since the air is blown out sequentially, the air is not blown out of both air knife nozzles at the same time, and the air speed of the air blown out from each air knife nozzle is kept constant even if the blowing amount of the blower is reduced by half. Therefore, it is possible to sufficiently wipe the droplets adhered to the surface of the work, and the amount of air blown into the cleaning chamber is only half that required when air is blown from both air knife nozzles at the same time. The air flow toward the inlet and outlet of the cleaning chamber is weakened, and the air containing the droplets of the cleaning liquid hardly leaks out of the cleaning chamber. It has a very good effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an example of a cleaning device according to the present invention. FIG. 2 is a plan view thereof. [Description of Reference Numerals] 1 ...... washing device 3 ...... tunnel cleaning chamber 4 ...... conveyor W ...... workpiece Z _1, Z ₂ · · shower cleaning Zones A ₁ , A ₂ Air blow device 8 Air knife nozzle 9 for upper surface Air knife nozzle 11 for side surface Air blowers 12 and 13 Air ducts 14 .... Switch damper 15 ... Control device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B08B 3/02 B08B 3/08

Claims (1)

(57) [Claims 1] A shower cleaning zone (Z ₁ , Z ₁ ) for spraying a cleaning liquid onto a work (W) conveyed by a conveyor (4) in a tunnel type cleaning chamber (3) to perform cleaning. Z ₂ ), a cleaning device provided with an air blow device (A ₁ , A ₂ ) for blowing air to the work (W) to wipe off droplets on the surface of the work (W), wherein the air blow device (A ₁ , A ₂ ) are an upper surface air knife nozzle (8) for squeezing air from the ceiling side to the upper surface of the work (W) in a film form, and squeezing air to the side surfaces of the work (W) from the left and right sides. The air knife nozzles (9) for the side to be blown are installed at predetermined intervals in the front and rear positions, and the air ducts (12, 13) for supplying air to the air knife nozzles (8, 9) are connected to the switching damper (14). Connected to the blower (11) Click (W) is feeds send air to the air knife nozzle side (9) only while passing through the air blowing position of the air knife nozzle side (9), an air knife nozzle side (9)
The switching damper (14) so as to supply air to the upper air knife nozzle (8) except when air is supplied to the nozzle.
A cleaning device, comprising: a control device (15) for selectively switching between the air ducts (12, 13).