JP2010221069A - Washing method of coating machine and coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a washing effect by exfoliating an aqueous coating material stuck and remaining inside the coating material route of a coating machine by shock waves caused by the rupture of micro nano bubbles when air and a washing liquid containing the micro nano bubbles are alternately supplied to the coating material route of the coating machine. <P>SOLUTION: The coating apparatus includes: the coating machine 6 to which the aqueous coating material is supplied by being communicably connected to coating material supply piping 4 where the aqueous coating material WP is circulated; a switching control valve 7 for washing which is communicably connected to the coating material route 6a of the coating machine 6 and alternately supplies the air and the washing liquid; a washing liquid supplier 8 which is communicably connected to the switching control valve 7 for washing and supplies the washing liquid to the switching control valve 7 for washing; and a micro nano bubble generator 9 for including the micro nano bubbles in the washing liquid of the washing liquid supplier 8. A distance from the washing liquid supplier 8 to the coating machine 6 is set to such a length that a position where the micro nano bubbles shrink and disappear is inside the coating material route 6a of the coating machine 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a coating machine cleaning method and a coating apparatus, and in particular, air and cleaning liquid are alternately supplied to a paint path of a coating machine, and an aqueous paint remaining in the coating path of the coating machine is left. The present invention relates to a cleaning method and a coating apparatus for a coating machine that can be cleaned.

  Conventionally, in order to paint automobiles and the like, a coating apparatus 50 as shown in FIG. 4A is provided in a painting line in a factory (for example, see Patent Document 1). The coating apparatus 50 includes a paint supply pipe 53 that circulates the water-based paint in the paint tank 51 so as to return to the paint tank 51 by being pumped by the pump 52, and a coating machine 54 connected to the paint supply pipe 53. ing. Further, as shown in FIG. 4B, a cleaning switching control valve 55 that alternately supplies air and cleaning liquid to the coating machine 54 communicates with the coating path 54 a of the coating machine 54 via a connecting pipe 56. Connected as possible.

  A paint switching control valve 57 is connected between the cleaning switching control valve 55 of the connecting pipe 56 and the coating machine 54 so as to communicate therewith. The paint switching control valve 57 is used to change the paint color. A paint tank 51, a pump 52, and a paint supply pipe 53 are provided according to different paint colors, and each paint supply pipe 53 is switched for paint. A control valve 57 is connected.

  In order to change the color from the previous color paint to the next color paint in the coating apparatus 50, the cleaning switching control valve 55 is controlled by a control unit (not shown) to alternately supply air and the cleaning liquid. Thus, the water-based paint remaining in the paint path 54a of the coating machine 54 is washed. After the color change, the paint switching control valve 57 is controlled by the control unit to open the valve connected to the paint supply pipe 53 through which the water-based paint having a desired paint color circulates, and the paint machine 54 receives the water. Supply paint.

Japanese Patent Laid-Open No. 11-300245

  However, in the painting apparatus 50 described in the background art, in order to change the color from the previous color paint to the next color paint in a painting line for painting a car or the like, the switching control valve 55 for cleaning is placed in the paint path 54a of the coating machine 54. Air and cleaning liquid are supplied alternately for cleaning, but the car body is sequentially transported in a relatively short time in the painting line, so this cleaning method has a limited cleaning time for color change, There is a possibility that the aqueous paint remaining in the paint path 54a of the coating machine 54 cannot be completely washed. In this case, since the cleaning in the coating machine 54 is poor, the previous color paint remaining in the next color paint is mixed and the paint quality is deteriorated.

  The present invention has been made to solve the above-described conventional problems, and when the air and the cleaning liquid containing micro-nano bubbles are alternately supplied to the paint path of the coating machine, the paint path of the coating machine is provided. It is an object of the present invention to provide a cleaning method and a coating apparatus for a coating machine capable of enhancing the cleaning effect by peeling off the water-based paint remaining in the interior with a shock wave caused by bursting micro-nano bubbles.

  According to a first aspect of the present invention for achieving the above object, there is provided a cleaning method for a coating machine in which air and a cleaning liquid are supplied to a paint path of a coating machine connected to a paint supply pipe through which a water-based paint circulates and supplied with water-based paint. When cleaning the paint path by supplying alternately, the cleaning liquid contains micro-nano bubbles.

  According to the cleaning method of the coating machine according to the first aspect, even if the cleaning liquid is water, the micro / nano bubbles contract while disappearing in the water and disappear in the water. The water-based paint remaining in the paint path of the coating machine by the shock wave can be peeled off.

  According to a second aspect of the present invention, in the coating machine cleaning method according to the first aspect, the micro-nano bubbles are contracted and eliminated at a dirt portion in the paint path of the coating machine.

  According to the cleaning method of the coating machine which is such a 2nd aspect, the inside of the coating-material path | route of a coating machine can be wash | cleaned efficiently.

  According to a third aspect of the present invention, in the cleaning method for a coating machine according to the first aspect or the second aspect, a cleaning liquid and air are introduced into the cylindrical member to generate a high-speed swirling flow. By discharging a high-speed swirling flow from the fluid outlet formed in the axial direction, micro-nano bubbles are contained in the cleaning liquid.

  According to such a third aspect of the cleaning method for a coating machine, the cleaning liquid and the air are swirled at high speed in the cylindrical member, and an air cavity portion is generated at the center of the high-speed swirling flow so as to be negative. When the pressure is formed, the swirl speed in the cylindrical member becomes faster than the swirl speed in the vicinity of the fluid outlet, so that the air cavity is cut by the speed difference and micro-nano bubbles are generated. Since the pressure in the cleaning liquid becomes higher than the gas pressure in the micro-nano bubbles, the generated micro-nano bubbles can be contracted and eliminated in the cleaning liquid.

  In addition, the coating apparatus according to the fourth aspect that achieves the above-described object is capable of communicating with a coating machine that is connected so as to be able to communicate with a paint supply pipe through which the water-based paint circulates and is supplied with water-based paint, and a paint path of the paint machine Switching control valve for supplying air and cleaning liquid alternately connected to each other, and a cleaning liquid supplier for connecting the cleaning liquid to the cleaning switching control valve connected to the cleaning switching control valve And a micro-nano bubble generator that contains micro-nano bubbles in the cleaning liquid of the cleaning liquid supply machine, and the piping distance from the cleaning liquid supply machine to the coating machine is such that the position where the micro-nano bubbles contract and disappear The length is set so as to be a dirty portion in the paint path of the coating machine. Here, the switching control valve has a plurality of valves, and in order to select the paint supplied from the pipe connected to each valve, only the valve connected to the pipe supplying the paint is opened. Says the device to control.

  According to such a fourth aspect of the coating apparatus, in order to change the color from the previous color paint to the next color paint, air and the cleaning liquid are alternately switched by the cleaning switching control valve in the paint path of the coating machine. , The water-based paint remaining in the paint path of the coating machine can be peeled off by the shock wave generated by the bursting of the bubbles by the micro-nano bubbles contained in the cleaning liquid by the micro-nano bubble generator.

  According to the cleaning method and the coating apparatus of the coating machine of the present invention, it is possible to improve the coating quality by enhancing the effect of cleaning the aqueous paint remaining in the coating path of the coating machine.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the example of preferable embodiment by the coating device of this invention, (A) is a whole block diagram, (B) is a detailed block diagram of a coating machine, the switching control valve for coating, and the switching control valve for washing | cleaning. It is explanatory drawing which shows the operation state of the cleaning agent supply machine of the coating apparatus of this invention, and a micro nano bubble generator. It is explanatory drawing which compares a normal bubble and a micro nano bubble. It is a whole block diagram which shows the conventional coating apparatus.

  The best mode for carrying out the coating machine cleaning method and the coating apparatus of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1 (A), the painting apparatus of the present invention has a painting tank 2 for storing a water-based paint WP for painting automobiles and the like, and a pump 3 for sucking and discharging the water-based paint WP stored in the painting tank 2. The paint supply pipe 4 is circulated so that the water-based paint WP in the paint tank 2 is pumped by the pump 3 and returns to the paint tank 3 again, and connected to the paint supply pipe 4 via the paint switching control valve 5. And a coating machine 6 to which the water-based paint WP is supplied. In FIG. 1A, six coating machines 6 are arranged on the painting line. The painting machine 6 is generally connected to a painting robot 61 having a swingable arm.

  The coating machine 6 has a structure in which the water-based paint WP supplied from the paint supply pipe 4 is atomized and sprayed on the surface of the object to be coated. A cup (not shown) is built in, and the water-based paint WP supplied into the bell cup is atomized by rotating the bell cup at high speed with an air motor.

  Further, as shown in FIG. 1B, the painting apparatus 1 is connected so as to be able to communicate with the paint path 6a of the painting machine 6, and alternately supplies air and cleaning liquid under the control of a control unit (not shown). A switching control valve 7 for cleaning, a cleaning agent supplier 8 connected to the switching control valve 7 for cleaning, and supplying a cleaning liquid to the switching control valve 7 for cleaning, and for cleaning the cleaning agent supplier 8 And a micro / nano bubble generator 9 for containing micro / nano bubbles in the liquid.

  The paint switching control valve 5 connected so as to be able to communicate with the paint path 6a of the coating machine 6 opens the valve selected by the control by the control unit, and the paint supply in which the paint of the desired paint color is circulated. The paint is supplied from the pipe 4 to the coating machine 6.

  The paint path 6a of the coating machine 6 and the cleaning switching control valve 7 are connected by a connecting pipe 10 so that the paint switching control valve 5 is located between the coating machine 6 and the cleaning switching control valve 7. It connects to the connecting pipe 10 to be able to communicate. The paint switching control valve 5 is used for changing the paint color, and is provided with a paint tank 2, a pump 3, and a paint supply pipe 4 according to different paint colors. The switching control valve 5 for use is distributed and connected to each valve. In FIG. 1 (B), since two paint switching control valves 5 are provided, they are indicated as 5A and 5B.

  As shown in FIG. 2, the micro / nano bubble generator 9 is provided in a tank of the cleaning liquid supply unit 8 and includes a cylindrical member 9a for introducing cleaning liquid and air. A pump (not shown) for generating a high-speed swirling flow by introducing cleaning liquid and air into the cylindrical member 9a is provided. The pump sucks air and the cleaning liquid and discharges them into the tank of the cleaning liquid supply unit 8 so that micro-nano bubbles are contained in the cleaning liquid. The cylindrical member 9a is provided with a fluid outlet 9b in the axial direction, and micro-nano bubbles can be contained in the cleaning liquid by discharging a high-speed swirling flow from the fluid outlet.

  Specifically, the cleaning liquid and the air are swirled at a high speed in the cylindrical member 9a, and an air cavity is formed at the center of the high-speed swirling flow (in FIG. 2, a large rotating arrow in the cylindrical member 9a). When AH is generated to form a negative pressure, the swirl speed in the cylindrical member 9a becomes faster than the swirl speed in the vicinity of the fluid outlet 9b. Therefore, the air cavity AH is cut by the speed difference and micro-nano bubbles are generated. To do. As shown in FIG. 3, the pressure generated in the cleaning liquid becomes higher than the gas pressure in the micro / nano bubbles MN, and thus the generated micro / nano bubbles can be contracted and eliminated in the cleaning liquid. In FIG. 3, a normal bubble AB of 50 μm or more is shown as a comparison target. The normal bubble AB generated in the cleaning liquid expands while rising and bursts on the surface of the water, but the micro-nano bubbles MN of about 0.2 to 10 μm generated in the cleaning liquid have a gas pressure that is the pressure in the cleaning liquid. When it becomes lower than that, it contracts while rising and disappears in the cleaning liquid. That is, the micro / nano bubble MN disappears earlier than the normal bubble AB.

  The piping distance from the cleaning liquid supply machine 8 in which the micro / nano bubble generator 9 is built in the tank to the coating machine 6 is such that the position where the micro / nano bubble MN disappears is a dirty portion in the paint path 6a of the coating machine 6. It is set to such a length. By setting the length to such a length, it is possible to clean the dirty portion in the paint path 6a of the coating machine 6 with a shock wave caused by the burst of bubbles when the micro / nano bubbles MN disappear. In other words, the aqueous paint remaining in the paint path 6a can be efficiently peeled off and cleaned.

  The pipe distance from the cleaning liquid supply machine 8 to the coating machine 6 is the time from when the micro / nano bubble MN is generated until the cleaning effect is weakened, and the measurement result and the cleaning liquid supply machine 8 to the coating machine 6 are measured. It is determined based on the flow rate of the cleaning liquid in the pipe up to.

  A method for cleaning the coating machine 6 by the coating apparatus 1 configured as described above will be described. In order to change the color from the previous color paint to the next color paint in this coating apparatus 1, the cleaning switching control valve 7 is controlled by a control unit (not shown) to supply air and cleaning liquid alternately. Thus, the water-based paint remaining in the paint path 6a of the coating machine 6 is washed.

  At this time, since the cleaning liquid is contained in the cleaning liquid by the micro / nano bubble generator 9 in the cleaning agent supplier 8, even if the cleaning liquid is water, the micro / nano bubbles shrink while rising in the water, and the water Therefore, the water-based paint remaining in the paint path 6a of the coating machine 6 can be peeled off by the shock wave caused by the bursting of bubbles at the time of disappearance. Therefore, the cleaning effect can be enhanced as compared with the cleaning method in which the dirty portion of the coating path 6a of the coating machine 6 is cleaned by simply supplying air and water alternately.

  Further, in this coating apparatus 1, the piping distance from the cleaning liquid supply unit 8 to the coating machine 6 is set so that the micro / nano bubbles can be contracted and disappeared in the dirt portion in the coating path 6a of the coating machine 6. Therefore, the inside of the paint path 6a of the coating machine 6 can be efficiently cleaned.

  Further, the micro / nano bubble generator 9 for supplying the cleaning liquid containing the micro / nano bubbles to the cleaning agent supply unit 8 introduces the cleaning liquid and air into the cylindrical member 9a to generate a high-speed swirling flow, thereby generating a cylinder. By discharging a high-speed swirling flow from the fluid outlet 9b formed in the axial direction of the member 9a, micro-nano bubbles can be contained in the cleaning liquid. Therefore, the pressure in the cleaning liquid is the gas pressure in the micro-nano bubbles. A water-based paint that remains in the paint path 6a of the coating machine 6 due to a shock wave caused by the bursting of bubbles when the micro-nano bubbles rapidly shrink and disappear due to the bubble generation action different from the normal bubble that becomes higher than the normal bubble. Can be peeled off.

  After the color change, the paint switching control valves 5A and 5B are controlled by the control unit, and only the paint switching control valve connected to the paint supply pipe 53 through which the water-based paint having a desired paint color circulates is provided. Even if it is opened and the water-based paint is supplied to the coating machine 6, the remaining water-based paint adhered to the paint path 6a of the coating machine 6 is peeled off and washed by the shock wave caused by the burst of bubbles when the micro / nano bubbles disappear. Since the effect is enhanced, the coating quality can be improved.

  Although the present invention has been described with the specific embodiments shown in the drawings, the present invention is not limited to the embodiments shown in the drawings, and is known so far as long as the effects of the present invention are achieved. It goes without saying that any configuration can be adopted.

DESCRIPTION OF SYMBOLS 1 ... Coating equipment 4 ... Paint supply piping 6 ... Paint machine 6a ... Paint path 7 ... Switching control valve for washing 8 ... Liquid supply machine for washing 9 ... Micro nano bubble generator WP ... Water-based paint

Claims (4)

  When cleaning the paint path by alternately supplying air and the cleaning liquid to the paint path of the coating machine connected to the paint supply pipe through which the water-based paint circulates and supplied with the water-based paint, A cleaning method for a coating machine, characterized by containing micro-nano bubbles.   The cleaning method for a coating machine according to claim 1, wherein the micro-nano bubbles are contracted and disappeared at a dirt portion in the paint path of the coating machine.   The cleaning liquid and air are introduced into a cylindrical member to generate a high-speed swirling flow, and the high-speed swirling flow is discharged from a fluid outlet formed in the axial direction of the cylindrical member into the cleaning liquid. The cleaning method for a coating machine according to claim 1 or 2, wherein the micro-nano bubbles are contained. A paint machine connected to a paint supply pipe through which the water-based paint circulates and connected to the paint supply pipe;
A switching control valve for cleaning, which is connected so as to be able to communicate with the paint path of the coating machine, and alternately supplies air and cleaning liquid;
A cleaning liquid supplier connected to the cleaning switching control valve so as to communicate with the cleaning switching control valve and supplying the cleaning liquid to the cleaning switching control valve;
A micro-nano bubble generator containing micro-nano bubbles in the cleaning liquid of the cleaning liquid supply machine,
The piping distance from the cleaning liquid supply machine to the coating machine is set to such a length that the position where the micro / nano bubbles contract and disappear becomes a dirty portion in the paint path of the coating machine. The painting equipment characterized by.

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