JP2004344889A - Coating method by rotary atomizing-head type coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for color-changing and coating many colors of coats without discharging coats by arranging, attachably and detachably, a cartridge for each color of coat on a coating apparatus. <P>SOLUTION: The coating method by the coating apparatus comprises a step for attaching the cartridge for the coat on a housing, a step for providing a coat in the cartridge for the coat to a rotary atomizing head, a step for detaching a used cartridge for the coat from the housing, and a step for attaching the cartridge for washing on the housing to wash a preceding coat adhered to the rotary atomizing head. Therefore, even if color-changing of the coat, a following coat can be coated by merely changing the cartridge for the coat without discharging the preceding coat. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a coating method of a rotary atomizing head type coating apparatus suitable for use in coating an object such as an automobile body while changing colors.

  2. Description of the Related Art In general, a rotary atomizing head type coating apparatus having a rotary atomizing head is used as a coating apparatus for coating an object to be coated such as an automobile body. Recently, it has been desired that a coating apparatus be capable of reducing the amounts of paint and solvent discarded during color changing work and of being able to handle many coating colors.

  Therefore, a first prior art is a rotary atomizing head type coating apparatus corresponding to reduction of waste paint and solvent and increase of coating color, for example, one described in Patent Document 1 is known. This rotary atomizing head type coating apparatus is configured such that a cartridge filled with a paint for each color is replaced and mounted each time a body or the like of an automobile to be coated is painted. However, this coating device does not have a device for cleaning the pre-color paint, and does not satisfy the function as a coating device.

JP-A-8-229446

  Further, as a coating apparatus, there is a so-called automatic coating apparatus for automatically coating a body or the like according to a predetermined program (for example, see Patent Document 2). In the automatic coating apparatus according to the second conventional technique, a cartridge for each color is arranged within a working range of a coating work machine such as a coating robot, and the desired work cartridge is set in the coating apparatus by operating the coating work machine. It is configured to be replaced and mounted. In addition, in the automatic coating apparatus according to the second conventional technique, a hose for supplying a cleaning fluid to the coating apparatus is connected to replace (color change) the cartridge, and the hose is connected to the inside of the coating apparatus. A cleaning fluid passage extending toward the rotary atomizing head is provided. Then, when cleaning the pre-color paint, the cleaning fluid supplied from the hose is jetted from the cleaning fluid passage toward the rotary atomizing head to wash the rotary atomizing head and the like.

JP-A-63-175662

  Further, as a third conventional technique, there is an automatic coating apparatus disclosed in Patent Document 3, for example. The automatic painting apparatus according to the third prior art is provided with a painting machine provided in a painting area, a painting machine having a painting machine attached to the painting machine and spraying paint, and a paint filled therein. It is provided with a separate cartridge for each color, which is exchangeably attached to the coating device, and a cartridge exchange device for supporting the cartridge and exchanging the cartridge with the coating device.

International Publication WO97 / 34707

  A hose for supplying a cleaning fluid to the coating apparatus is connected to the automatic coating apparatus according to the third prior art configured as described above, similarly to the automatic coating apparatus according to the second conventional technique. Are provided with a cleaning fluid passage communicating with the hose and extending toward the rotary atomizing head, a cleaning fluid valve for opening and closing the cleaning fluid passage, and the like.

By the way, in the automatic coating apparatuses according to the second and third prior arts described above, since the apparatus for cleaning the rotary atomizing head is provided in the coating apparatus, the coating apparatus has a hose for supplying a cleaning fluid. connect, is provided with a cleaning fluid communication path and the like. For this reason, there is a problem that the handling of the hose is troublesome, and the coating apparatus becomes large and the weight increases.

Further, when a high voltage to increase the coating efficiency was configured to be applied to the paint, this high voltage cleaning fluid communication path, there is a problem that leak to the outside through the washing fluid in the hose .

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the related art, and an object of the present invention is to provide a rotary atomizing head capable of changing colors and applying a large number of paints without discharging the paints. An object of the present invention is to provide a coating method for a mold coating apparatus.

In order to solve the above-mentioned problem, a coating method of a rotary atomizing head type coating apparatus adopted by the invention of claim 1 is characterized in that a front side is a coating machine mounting portion for mounting a coating machine, and a rear side is a cartridge mounting portion for mounting a cartridge. A coating machine attached to a coating machine mounting portion of the housing, the coating machine comprising: a housing having a rotating shaft; an air motor having a rotating shaft; and a rotary atomizing head provided on the rotating shaft located in front of the air motor. A feed tube insertion hole having a front end opened in the rotary atomizing head and a rear end opened in the cartridge mounting portion of the housing, and a cylinder filled with paint. washing and Ri Do and a feed tube extending axially from the distal end of the cylinder, and a separate paint cartridges for each color held in the cartridge holder, the inside Ri Do and a feed tube extending from the distal end of the cylinder and the cylinder in which fluid is filled in the axial direction, a painting method of the rotary atomizing head type coating apparatus and a cleaning cartridge held in the cartridge holder Removing the paint cartridge to be used for painting from the cartridge holding base, attaching the cylinder of the paint cartridge to the cartridge attachment portion of the housing, and inserting a feed tube into the feed tube insertion hole; With the rotary atomizing head rotated by the air motor, the coating process in which the paint in the installed paint cartridge is supplied to the rotary atomizing head through the feed tube, and after the coating is completed, the used paint cartridge is removed. paint back into the cartridge holder and removable from said housing And cartridges removal step, in order to clean the pre-color paint adhered to the rotary atomizing head, mounting the cartridge before Kiarai purification from the cartridge holder the bomb extraction the cleaning cartridge to the cartridge mounting portion of the housing, a cleaning cartridge mounting step to insert the feed tube to the feed tube passage hole, the cleaning fluid in the cleaning cartridge, a cleaning fluid supplying step of supplying to the rotary atomizing head through the feed tube, after the end of washing, comprising a cleaning cartridge unloading step of returning to the cartridge holder by detachment the used cleaning cartridge from the housing.

According to the first aspect of the present invention, in the paint cartridge attaching step, the paint cartridge used for painting is taken out of the cartridge holding base , the cylinder of the paint cartridge is attached to the cartridge attaching portion of the housing, and the feed tube is inserted through the feed tube. Insert into the hole. Next, in the coating step, the paint in the attached paint cartridge is supplied to the rotary atomizing head through the feed tube while the rotary atomizing head is rotated by the air motor, thereby coating the workpiece. be able to. Then, the paint cartridge unloading step, after painting is finished, return to the cartridge holder by detachment the used paint cartridge from the housing. Next, the cleaning cartridge mounting process, in order to clean the color paint before adhering to the rotary atomizing head, preparative bomb extraction the cleaning cartridge cleaning cartridge from the cartridge holder to the cartridge mount portion of the housing with , to insert the feed tube into the feed tube passage hole. In the next cleaning fluid supply step, the cleaning fluid in the cleaning cartridge is supplied to the rotary atomizing head through the feed tube. Further, when the cleaning is finished, the cleaning cartridge unloading step, revert to the cartridge holder by detachment the used cleaning cartridge from the housing, it is possible to paint ready for the next color.

  Accordingly, by preparing in advance a paint cartridge filled with various kinds of paint and a cleaning cartridge filled with a cleaning fluid, a single rotary atomizing head type coating apparatus can perform a color change operation of many colors. , The reliability can be improved, and the range of use can be expanded. In addition, since neither the paint hose nor the solvent hose is connected to the paint cartridge and the cleaning cartridge, the high voltage applied to the paint can be applied even when applying paint with low electrical resistance such as metallic paint and water-based paint. Can be prevented from leaking through the paint, and it is possible to apply various kinds of paint, thereby improving the reliability of the coating apparatus. Further, by using a common cartridge for the paint cartridge and the cleaning cartridge, the cost can be reduced.

  Hereinafter, a case where the rotary atomizing head type coating apparatus according to the embodiment of the present invention is mounted on a coating robot will be described as an example, and the details will be described with reference to the accompanying drawings.

First, rotation in Fig. 1 through 10 show an implementation of the embodiment of the present invention, 1 is a coating robot serving as a coating working machine, coating wear robot 1 includes a base 2, on the base stand 2 A vertical arm 3 provided so as to be swingable and swingable, a horizontal arm 4 swingably provided at the tip of the vertical arm 3, and a wrist 5 provided at the tip of the horizontal arm 4. ing.

  A power supply device 6 is connected to the painting robot 1 via a power supply line 6A, a control air source 7 is connected via an air hose 7A, and a negative pressure such as a vacuum pump or an ejector is connected via a negative pressure hose 8A. The generation source 8 is connected, the removal air source 9 is connected via an air hose 9A, the paint valve pilot air source 10 is connected via an air hose 10A, and the thinner valve pilot air source 11 is connected via an air hose 11A. The thinner supply device 12 is connected via a thinner hose 12A. Then, the power supply line 6A and the hoses 7A, 8A, 9A, 10A, 11A, 12A reach the wrist 5 through the vertical arm 3 and the horizontal arm 4, and are connected to a rotary atomizing head type coating apparatus 21 described later. .

  Reference numeral 21 denotes a rotary atomizing head type coating device (hereinafter, referred to as a coating device 21) provided in the coating robot 1. The coating device 21 includes a housing 22 and a coating machine 28, which will be described later, as shown in FIGS. , Feed tube insertion holes 27 and 34, a paint cartridge 35, and the like.

  Reference numeral 22 denotes a housing formed of a high-performance resin material (engineering plastic) such as PTFE, PEEK, PEI, POM, PI, and PET. The housing 22 is attached to the tip of the wrist 5. The housing 22 has a neck portion 23 detachably attached to the tip of the wrist 5 of the coating robot 1 via a cylindrical fastening portion 23A, and a head integrally formed at the tip of the neck portion 23. And a unit 24.

  Here, a coating machine mounting portion 25 is formed in a concave cylindrical shape on the front side of the head portion 24, and a cartridge mounting portion 26 is formed in a concave cylindrical shape on the rear side of the head portion 24. Further, a female connecting portion 26B and a male connecting portion 26C are separately formed on a bottom portion 26A of the cartridge mounting portion 26, and a male connecting portion 36A of a cylinder 36 described later is fitted to the female connecting portion 26B, and the male connecting portion is formed. The female connection portion 36B of the cylinder 36 fits into the portion 26C. The female connecting portion 26B and the male connecting portion 26C of the cartridge mounting portion 26 position the cylinder 36 in the circumferential direction when the cylinder 36 is mounted on the cartridge mounting portion 26.

Reference numeral 27 denotes a housing side feed tube insertion hole provided in communication between the coating machine mounting portion 25 of the head portion 24 and the cartridge mounting portion 26, and a small diameter feed tube insertion hole is provided at the front side of the housing side feed tube insertion hole 27. parts 27A, and the has a conical diameter portion 27B which is reduced in diameter on the rear side is conical. Here, the feed tube insertion portion 27A is formed coaxially with a coating machine side feed tube insertion hole 34 described later. Further, the conical diameter portion 27B, in which the conical protrusions 38 of the cartridge 35 to be described later is fitted in contact, to position it axially, radially.

  Numeral 28 denotes a coating machine mounted in a coating machine mounting portion 25 of the head portion 24. The coating machine 28 includes an air motor 29, a rotary atomizing head 30 rotated by the air motor 29, and a front end side of the air motor 29. And a shaping air ring 31 provided at the center.

  Here, the air motor 29 is provided with a motor case 29A inserted into the coating machine mounting portion 25 and penetrated in the motor case 29A in the axial direction. The rear end has a small diameter and the front has a large diameter. A stepped shaft hole 29B, a rotating shaft 29C provided in the large diameter portion of the shaft hole 29B so as to extend in the axial direction, and having a distal end protruding from the motor case 29A and a proximal end of the rotating shaft 29C. An air turbine 29D positioned and fixed to the rotating shaft 29C, and a static pressure provided in the motor case 29A located around the large diameter portion of the shaft hole 29B with a small gap from the rotating shaft 29C. It is constituted by an air bearing 29E.

  Reference numeral 30 denotes a rotary atomizing head which is located on the tip end side of the rotary shaft 29C and is attached to the air motor 29. The rotary atomizing head 30 includes a bell cup 30A formed in a bell shape as shown in FIG. A disk-shaped hub member 30B fitted to the center of the front surface of the bell cup 30A; and a paint thinning surface 30C formed on the front surface of the bell cup 30A on the outer peripheral side of the hub member 30B and thinning the paint. A paint reservoir 30D defined on the rear side of the hub member 30B, and a plurality of cleaning fluids provided at the center of the hub member 30B and for allowing a cleaning fluid supplied from the front side of the hub member 30B to flow into the paint reservoir 30D. Are provided on the outer peripheral side of the hub member 30B and guide the paint discharged from the feed tube 39 to the paint thinning surface 30C. , And is configured by 30F, ... a.

The rotary atomizing head 30 is rotated at a high speed by the air motor 29 to guide the paint supplied from the feed tube 39 to the paint reservoir 30D from each paint outlet hole 30F to the paint thinning surface 30C. Then, the paint flowing out to the paint thinning surface 30C is thinned on the paint thinning surface 30C and atomized by centrifugal force. As a result, the atomized paint forms charged paint particles charged at a high voltage as described later, and the charged paint particles fly along an electrostatic field formed between the paint paint 59 and the coating material 59 described later, and To wear.

  Reference numeral 31 denotes a shaping air ring. The shaping air ring 31 is mounted on the coating machine mounting portion 25 of the head 24 so as to fix the air motor 29 from the front side. The shaping air ring 31 has a number of shaping air ejection holes 31A, 31A formed in an annular shape on the outer peripheral side thereof. The shaping air ejection holes 31A are directed toward the discharge edge of the rotary atomizing head 30. The shaping air is blown out to form a pattern of the charged paint particles discharged from the rotary atomizing head 30.

  Reference numeral 32 denotes a high-voltage generator provided on the neck portion 23 of the housing 22. The high-voltage generator 32 is constituted by, for example, a Cockcroft circuit, and controls a voltage supplied from the power supply device 6 through the power supply line 6A to -60 to -60. The voltage is raised to -120 kV. The output side of the high-voltage generator 32 is electrically connected to, for example, an air motor 29 via a high-voltage cable 32A, so that the high-voltage generator 32 can rotate the atomizing head 30 via a rotation shaft 29C of the air motor 29. A high voltage is applied to the paint to directly charge the paint. In the case of an external charging method for indirectly charging the spray paint particles with a high voltage, an external electrode is provided on the shaping air ring 31 or the like, and the high voltage output from the high voltage generator 32 is directly applied to this external electrode. Supplying.

  Reference numeral 33 denotes a plurality of air passages provided on the neck portion 23 of the housing 22 and connected to the control air source 7 via the air hose 7A. Each of the air passages 33 is a turbine air, a bearing air, a brake air, a shaping air, or the like. In this embodiment, only one air passage is typically shown.

  Here, the air passage for supplying turbine air supplies air to the air turbine 29D of the air motor 29. The air passage for supplying the bearing air supplies the air to the static pressure air bearing 29E of the air motor 29. The air passage for supplying brake air supplies brake air for stopping rotation toward the air turbine 29D. Further, the air passage for supplying the shaping air supplies the air toward the shaping air ejection hole 31 </ b> A of the shaping air ring 31.

  Reference numeral 34 denotes a coating machine side feed tube insertion hole which is provided through the rotating shaft 29C and the motor case 29A constituting the air motor 29 in the axial direction. The base end side of the coating machine side feed tube insertion hole 34 is the housing side. The feed tube insertion hole 27 is open to the feed tube insertion portion 27A, and the distal end side is open to the paint reservoir 30D of the rotary atomizing head 30. Further, the feed tube insertion hole 34 on the coating machine side is formed coaxially with the feed tube insertion portion 27A of the housing side feed tube insertion hole 27. The feed tube 39 of the paint cartridge 35 is removably inserted into the feed tube insertion holes 27 and 34.

  35n are paint cartridges for individually storing paints of colors a, b,... N and supplying them to the rotary atomizing head 30 (hereinafter referred to as paint cartridges 35 as a whole). Each of the paint cartridges 35 is attached so as to be inserted through the feed tube insertion holes 27 and 34, and supplies the paint to the rotary atomizing head 30 independently for each color. As shown in FIG. 5, the paint cartridge 35 has a cylinder 36, a conical convex portion 38 provided on the front end surface of the cylinder 36, and an axially extending portion extending from the conical convex portion 38. A feed tube 39 serving as a supply path 39A, a piston 40 provided in the cylinder 36, and a cartridge-side thinner passage 43 for supplying a thinner forming an extruding liquid are roughly constituted.

  Reference numeral 36 denotes a cylinder forming the main body of the paint cartridge 35. The cylinder 36 has a diameter such that it can be inserted into and removed from the cartridge mounting portion 26 with a high-performance resin material or the like similar to the housing 22. (Cylinder). Further, an O-ring 37 is provided on the outer peripheral side of the cylinder 36 and is located on the distal end side and maintains an airtight state between the cylinder 36 and the cartridge mounting portion 26. On the front end side of the cylinder 36, a male connecting portion 36A is provided at a position corresponding to the female connecting portion 26B of the cartridge mounting portion 26, and a female connecting portion 36B is provided at a position corresponding to the male connecting portion 26C of the cartridge mounting portion 26. Is provided. Further, a gripping projection 36 </ b> C that is gripped when the cartridge 35 is replaced is provided at the rear end of the cylinder 36. The male connecting portion 36A and the female connecting portion 36B position the cylinder 36 in the circumferential direction when the cylinder 36 is mounted on the cartridge mounting portion 26.

38 is a conical projection which is integrally formed with the cylinder 36, the conical projection 38, a paint cartridge 35 in a state attached to the cartridge mount portion 26 of the housing 22, the conical diameter portion 27B The paint cartridge 35 is positioned in the axial and radial directions by abutting and fitting.

  Reference numeral 39 denotes a feed tube provided on the distal end side of the conical convex portion 38. In the feed tube 39, a paint supply path 39A extending coaxially is formed. The base end of the paint supply path 39A is connected to a paint storage chamber 41, which will be described later, and the distal end is open toward the rotary atomizing head 30. The feed tube 39 is provided with a valve seat portion 39B with a reduced diameter at the tip end side of the paint supply passage 39A, and a valve body 46B of a paint valve 46 described later separates and sits on the valve seat portion 39B. The length of the feed tube 39 is set such that the tip of the feed tube 39 extends into the paint reservoir 30 </ b> D of the rotary atomizing head 30 in a state where the paint cartridge 35 is attached to the cartridge attachment portion 26 of the housing 22. ing.

  On the other hand, reference numeral 40 denotes a piston which is slidably fitted in the cylinder 36 in the axial direction. The piston 40 communicates with the paint supply passage 39A of the feed tube 39 through the communication passage 41A. An accommodating chamber 41 and a thinner accommodating chamber 42 for accommodating the thinner are defined.

  Reference numeral 43 denotes a cartridge-side thinner passage. The cartridge-side thinner passage 43 is provided so as to extend in the axial direction on the outer peripheral side of the cylinder 36. It communicates with the chamber 42. Then, the cartridge-side thinner passage 43 pushes the piston 40 toward the feed tube 39 by supplying the thinner into the thinner accommodating chamber 42, whereby the piston 40 is filled with the paint filled in the paint accommodating chamber 41. Is extruded toward the rotary atomizing head 30.

  As the thinner as the extruded liquid, a thinner having high insulating property or electric resistance is used in order to prevent a high voltage generated by the high voltage generator 32 from leaking through the thinner. Further, by using thinner as the extruding liquid, this thinner prevents the paint from drying and sticking to the inner wall of the cylinder 36 when the piston 40 is displaced, and always keeps the inner wall of the cylinder 36 in a wet state. I do. Thereby, the frictional resistance between the piston 40 and the inner wall of the cylinder 36 is stabilized, and the piston 40 can be pushed smoothly. Further, the sealing performance between the piston 40 and the inner wall of the cylinder 36 can be improved.

  A quick coupling 44 is provided in the male connection portion 36A of the cylinder 36 and is provided at the open end of the cartridge-side thinner passage 43. The quick coupling 44 is attached to the cartridge mounting portion 26 as shown in FIG. The valve is opened when the male connection portion 36A is fitted to the female connection portion 26B, and the cartridge-side thinner passage 43 is communicated with a housing-side thinner passage 48 described later, thereby permitting the thinner to flow. On the other hand, as shown in FIG. 5, when the cylinder 36 is removed from the cartridge mounting portion 26 and the male connection portion 36A is detached from the female connection portion 26B, the cartridge-side thinner passage 43 is shut off by spring force, and Prevents thinner from flowing out.

  Reference numeral 45 denotes a paint valve accommodating portion provided on the tip side of the cylinder 36. The paint valve accommodating portion 45 has a circular hole arranged coaxially with the feed tube 39. The paint valve accommodating section 45 accommodates a paint valve 46 described later.

  Reference numeral 46 denotes a paint valve provided in the paint cartridge 35. The paint valve 46 is opened when the paint in the paint chamber 41 is supplied to the rotary atomizing head 30. The paint valve 46 has a piston portion 46A slidably inserted into the paint valve housing portion 45, a base end side attached to the piston portion 46A, and a distal end side inside the paint supply passage 39A of the feed tube 39. A long valve body 46B extending and having its distal end separated and seated on the valve seat 39B, and a valve spring 46C for urging the valve body 46B to be seated on the valve seat 39B via the piston 46A. And is constituted by. Further, the piston portion 46A defines the paint valve housing portion 45 as a spring chamber 46D that houses the valve spring 46C and a pressure receiving chamber 46E into which pilot air flows. Thus, the paint valve 46 is configured as an air pilot type switching valve.

  In the paint valve 46, the valve body 46B is normally seated on the valve seat portion 39B of the feed tube 39 by the urging force of the valve spring 46C, shuts off the paint supply path 39A, and supplies the paint to the rotary atomizing head 30. Has stopped. On the other hand, when the paint valve 46 is supplied with pilot air from the paint valve pilot air source 10 to the pressure receiving chamber 46E via the air hose 10A, the housing-side pilot air passage 49, and the cartridge-side pilot air passage 47, the valve spring 46C The valve body 46B separates from the valve seat portion 39B against the pressure, and supplies the rotary atomizing head 30 with the paint in the paint accommodating chamber 41. Here, one end of the pilot air passage 47 opens to the inner peripheral surface of the female connection portion 36B of the cylinder 36, and the other end communicates with the pressure receiving chamber 46E of the paint valve 46.

Reference numeral 48 denotes a housing-side thinner passage provided in the housing 22. The thinner passage 48 extends in the axial direction in the neck portion 23 and is formed in an L-shape bent rearward at the position of the thinner valve accommodating portion 53. I have. Then, the housing-side thinner passage 48 has one end connected to the Resid runner feeder 12 to dispensing a thinner to form a paint extruding extruding liquid in the paint chamber 41 of the paint cartridge 35, the other end cartridge mount The female connection portion 26B of the portion 26 is open at the bottom. The bent portion of the thinner passage 48 on the housing side is a valve seat portion 48A on which the valve body 54B of the thinner valve 54 separates and sits.

  Reference numeral 49 denotes a housing-side pilot air passage provided in the housing 22. One end of the pilot air passage 49 is connected to the paint valve pilot air source 10 via an air hose 10A. The other end of the pilot air passage 49 is opened on the peripheral surface of the male connection portion 26C provided on the bottom 26A of the cartridge mounting portion 26 so as to correspond to the cartridge-side pilot air passage 47.

  Reference numeral 50 denotes an air suction passage which is provided in the housing 22 and opens at the bottom 26A of the cartridge mounting portion 26. The air suction passage 50 is connected to the negative pressure generating source 8 via a negative pressure hose 8A. The air suction passage 50 sucks air in a negative pressure space 51 defined between the cylinder 36 of the paint cartridge 35 and the inner side of the cartridge mounting portion 26, thereby forming the paint cartridge 35. And is fixed to the cartridge mounting portion 26.

Reference numeral 52 denotes a removal air supply passage provided in the housing 22 and opened to the bottom portion 26A of the cartridge mounting portion 26. The removal air supply passage 52 is connected to the removal air source 9 via an air hose 9A. The removal air supply passage 52 releases the paint cartridge 35 from the cartridge mounting portion 26 by supplying air to the negative pressure space 51 , and allows the removal of the paint cartridge 35.

  Reference numeral 53 denotes a thinner valve accommodating portion provided on the head portion 24 of the housing 22. The thinner valve accommodating portion 53 has a circular hole located at an inner portion away from the female connecting portion 26B in the axial direction. A thinner valve 54 described later is accommodated in the thinner valve accommodating portion 53.

  A thinner valve 54 is provided in the housing 22 in the middle of the thinner passage 48 on the housing side. The thinner valve 54 is used to supply the paint in the paint chamber 41 to the rotary atomizing head 30. The valve is opened when thinner is supplied to the chamber 42.

  The thinner valve 54 has a piston 54A slidably inserted into the thinner valve accommodating portion 53 and a base end attached to the piston 54A, and a distal end mounted on the housing 54, in substantially the same manner as the paint valve 46. The valve body 54B protrudes into the thinner passage 48 and has a distal end separated and seated on the valve seat 48A, and a valve spring 54C for urging the valve 54B to be seated through the piston 54A. Have been. Further, the piston portion 54A defines the thinner valve housing portion 53 as a spring chamber 54D for housing the valve spring 54C and a pressure receiving chamber 54E into which pilot air flows. Thus, the thinner valve 54 is configured as an air pilot type switching valve.

  In the thinner valve 54, the valve body 54B is normally seated on the valve seat portion 48A of the housing-side thinner passage 48 by the urging force of the valve spring 54C, shuts off the thinner passage 48, and supplies the thinner to the thinner accommodating chamber 42. Has stopped. On the other hand, when pilot air is supplied from the thinner valve pilot air source 11 to the pressure receiving chamber 54E via the air hose 11A and the pilot air passage 55, the valve body 54B separates from the valve seat 48A against the valve spring 54C. Then, the thinner is supplied to the thinner accommodating chamber 42. Here, one end of the pilot air passage 55 is connected to the thinner valve pilot air source 11 via the air hose 11A, and the other end thereof communicates with the pressure receiving chamber 54E of the thinner valve 54.

On the other hand, reference numeral 56 denotes a cartridge holding table which is located in the vicinity of the coating robot 1 and is provided in a coating booth or the like. The cartridge holding table 56 holds paint cartridges 35a, 35b,. ing. Further, the cartridge holding base 56 has a paint filling device that fills the paint containing chamber 41 of the paint cartridge 35 with paint after painting, and a thinner collecting device that collects thinner discharged from the thinner containing chamber 42 when filling with paint. (Neither is shown) .

A cleaning cartridge 57 is mounted on the cartridge mounting section 26 of the housing 22 and has the same configuration as the paint cartridge 35. However, unlike the paint cartridge 35, the cleaning cartridge 57 is filled with a thinner as a cleaning fluid. Further, the cleaning cartridge 57 is arranged on the cartridge holding base 56 together with the paint cartridge 35.

Reference numeral 58 denotes a waste liquid collecting container located near the coating robot 1 and provided in a coating booth or the like. The waste liquid collecting container 58 collects thinner used for cleaning, and is disposed in a waste liquid tank (not shown). It is connected. The waste liquid collecting container 58 is not provided with a washing nozzle.

  The coating apparatus 21 according to the present embodiment has the above-described configuration. Next, a coating method of the coating apparatus 21 will be described with reference to FIGS.

First, the case where the paint of the color a is applied to the object 59 using the paint cartridge 35a of the color a will be described. First, as shown in FIG. 7, in the paint cartridge attaching step, the paint cartridge 35 a filled with the a-color paint is taken out from the cartridge holding base 56, and the paint cartridge 35 a is attached to the housing 22. Then, when mounting the paint cartridge 35a in the housing 22, while inserting the feed tube 39 conical diameter portion 27B of the housing-side feed tube passage hole 27, feed tube passage portion 27A, the side of the coating machine feed tube passage hole 34 The cylinder 36 is inserted into the cartridge mounting portion 26 of the head portion 24.

  When the paint cartridge 35a is mounted, the paint cartridge 35a is fixed to the housing 22 by sucking air in the negative pressure space 51 defined between the paint cartridge 35a and the cylinder 36 by the air suction passage 50. And hold it in a retaining state.

Next, the painting process will be described. In this coating process, the air motor 29 is driven to rotate the rotary atomizing head 30 at high speed, and the shaping air is jetted from each shaping air jetting hole 31A of the shaping air ring 31, and the high voltage generator 32 turns the a-color paint. Apply high voltage. In this state, the thinner for extrusion is supplied from the thinner supply device 12 into the thinner accommodating chamber 42 of the cylinder 36 via the thinner passages 48 and 43. As a result, the piston 40 is displaced by the thinner for extrusion as shown in FIG. 8, and the a-color paint in the paint accommodating chamber 41 is supplied to the rotary atomizing head 30 through the feed tube 39, and the coating from the rotary atomizing head 30 is performed. Spray toward the coating 59 .

At the time of spraying the paint, the a-color paint is centrifugally atomized by the rotary atomizing head 30 and atomized to form charged paint particles charged to a high voltage. The charged paint particles fly along the electrostatic field formed between the charged paint particles and the object 59 while being shaped into a desired spray pattern by the shaping air ejected from each shaping air ejection hole 31A. Apply to the coating 59 .

Next, the paint cartridge removing step will be described. In this case, first, the vertical arm 3, the horizontal arm 4, etc. of the coating robot 1 are operated to place the coating apparatus 21 at the cartridge replacement position shown in FIG . In this condition, by supplying air from the ejection air supply passage 52 to the vacuum space 51 to release the paint cartridge 35a for the cartridge mounting portion 26. Then, as shown by the arrow in FIG. 9, the paint cartridge 35a is gripped by the gripper 60 , pulled out from the housing 22 in the axial direction, and returned to the cartridge holding base 56.

Next, a cleaning step of cleaning the rotary atomizing head 30 will be described. This cleaning step is for cleaning the rotary atomizing head 30 using the cleaning cartridge 57, and includes a cleaning cartridge attaching step, a thinner discharging step, and a cleaning cartridge removing step.

First, in the cleaning cartridge mounting step, the cleaning cartridge 57 is mounted on the cartridge mounting portion 26 of the housing 22. At this time, the cleaning cartridge 57 is fixed to the housing 22 by suction of air.

In the thinner discharge step, which is the cleaning fluid supply step, as shown in FIG. 10, the vertical arm 3, the horizontal arm 4, etc. of the coating robot 1 are operated to move the rotary atomizing head 30 of the coating machine 28 into the waste liquid collecting container 58. Insert into In this state, the rotary atomizing head 30 is rotated at a high speed by the air motor 29, and a thinner for extrusion is supplied to the cleaning cartridge 57, and the cleaning thinner filled in the cartridge 57 is supplied to the rotary atomizing head 30. By discharging the paint toward the surface, the a-color paint adhered to the rotary atomizing head 30 is washed.

Next, in the cleaning cartridge removing step, the fixing of the cleaning cartridge 57 is released, and the cleaning cartridge 57 is removed from the housing 22. Thus, the cleaning of the rotary atomizing head 30 is completed.

  When the painting operation using the a-color paint cartridge 35a is completed in this way, for example, the b-color paint cartridge 35b is taken out from the cartridge holding base 56 and attached to the housing 22 to obtain the same as the a-color paint. The b-color paint can be applied.

Thus, in the present embodiment, the housing 22 is attached to the wrist 5 of the painting robot 1, and the housing 22 is filled with paint cartridges 35a, 35b,. 35n is prepared. Then, the paint cartridge 35 is attached to the housing 22 in the paint cartridge attaching step, and paint is supplied from the paint cartridge 35 to the rotary atomizing head 30 in the painting step to paint the object 59 to be painted. In the cartridge removal step, the paint cartridge 35 is removed from the housing 22, and in the cleaning step, the pre-color paint adhered to the rotary atomizing head 30 is washed, so that the work 59 is coated.

  Therefore, according to the present embodiment, by preparing the paint cartridge 35 filled with various kinds of paints in advance, it is possible to cope with the color changing operation of many colors with one painting apparatus 21. , Can increase the reliability and extend the range of use. In addition, even if the paint of another color is added, it is easy to cope with the situation by simply disposing a paint cartridge 35 filled with the paint of another color on the cartridge holding base 56 without modifying the coating device 21. be able to.

  In addition, by exchanging the paint cartridge 35 for each color, it is possible to eliminate the discharge of paint at the time of color change, so that the cleaning time can be shortened, and the paint and thinner are not wasted and the environment is friendly. The coating device 21 can be used.

  In addition, since a paint hose for supplying paint can be omitted, even when a paint having a low electric resistance such as a metallic paint or a water-based paint is applied as a paint, a high voltage can be prevented from leaking. In addition, it is possible to apply various kinds of paints, and it is possible to widen the use range of the coating apparatus 21.

In addition, since the cartridge used as the paint cartridge 35 can be used as it is as the cleaning cartridge 57, the configuration for cleaning the rotary atomizing head 30 can be simplified and the cost can be reduced.

  Further, the coating apparatus 21 is provided with a paint valve 46 for supplying and stopping the paint, and a thinner valve 54 for supplying and stopping the thinner for extrusion. Thus, the paint valve 46 and the thinner valve 54 are opened and closed by the paint spray command and the stop command, so that the paint can be sprayed and stopped immediately after the spray command and the stop command.

Therefore, since the control can be accurately performed in accordance with the coating program, the coating quality can be improved by keeping the thickness of the coating film constant, and the reliability can be improved. Further, when the paint cartridge 35 is pulled out of the housing 22 and replaced, the paint can be prevented from dripping from the feed tube 39 .

Na us, in the embodiment, a case of attaching the coating system 21 to the wrist 5 of the coating robot 1 as painting work machine has been described, the present invention is not limited to this, for example, a reciprocator It is also possible to adopt a configuration in which the coating apparatus 21 is mounted on another coating work machine such as the above. In this case, since a reciprocator is narrow operating range, it is to configure to be movable waste liquid collecting container 58 desirably.

Further, in the above-described embodiment, the case where the piston 40 is provided in the cartridges 35 and 57 and the paint and the thinner are extruded by the piston 40 is illustrated, but instead, for example, a bellows or the like is used and the inside of the bellows is used. It may be configured to extrude the filled paint or the like.

Further, in the above embodiment, the shaft hole 29B of the air motor 29 is formed in a stepped shape in which the rear end side has a small diameter and the front side has a large diameter, and the rotating shaft 29C is provided in the large diameter portion of the shaft hole 29B. Although the case has been described as an example, instead of this, for example, as shown in a modification shown in FIG. 11 , the shaft hole 61B of the air motor 61 is made to penetrate in the axial direction with substantially the same diameter, and the shaft hole 61B is made to penetrate. It is good also as a structure provided with the rotating shaft 61C so that it may perform.

In the above embodiment, the cartridges 35 and 57 are fixed to the housing 22 by suctioning the air in the negative pressure space 51 via the air suction passage 50. without necessarily, by engaging the locking hole in which a locking member provided on the housing 22 side to the cartridge 35, 57 side for example, may be fixed to the cartridge 35, 57.

In the above-described embodiment, the case where thinner is used as an extruding liquid has been described as an example. May be extruded.

The rotary atomizing head type coating apparatus according to the implementation of the embodiment of the present invention is a front view showing with coating robot or the like. It is a longitudinal sectional view showing a rotary atomizing head type coating apparatus according to the implementation. FIG. 3 is an enlarged vertical sectional view of the rotary atomizing head type coating apparatus shown in FIG. 2. It is a principal part expanded longitudinal cross-sectional view which shows a rotary atomization head with a rotating shaft and the front-end | tip of a feed tube. FIG. 3 is a vertical sectional view showing a cartridge . It is a time chart showing the operation of a rotary atomizing head type coating apparatus according to the implementation. FIG. 4 is an operation explanatory view showing a state where a paint cartridge is attached to a housing. It is operation | movement explanatory drawing which shows the state which is apply | coating a to-be-coated material with a rotary atomization head type coating device. It is operation | movement explanatory drawing which shows the state which removed the paint cartridge from the housing at the position of the atomization head washing | cleaning apparatus. It is operation | movement explanatory drawing which shows the state which wash | cleans a rotary atomization head with a cleaning cartridge. It is a longitudinal cross-sectional view which shows the coating machine main body by the modification of this invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 21 Rotary atomization head type coating device 22 Housing 25 Coating machine mounting part 26 Cartridge mounting part 27 Housing side feed tube insertion hole 28 Coating machine 29, 61 Air motor 29A, 61A motor case 29B, 61B shaft hole 29C, 61C rotating shaft 29D, 61D air turbine 29E, 61E static pressure air bearing 30 rotary atomizing head 34 paint tube feed tube insertion hole 35a, 35b,... 35n paint cartridge 36 cylinder 39 feed tube
57 cleaning cartridge
59 objects

Claims (1)

A housing in which the front side is a coating machine mounting portion for mounting a coating machine and the rear side is a cartridge mounting portion for mounting a cartridge,
A coating machine comprising an air motor having a rotating shaft and a rotary atomizing head provided on the rotating shaft located on the front side of the air motor, and attached to a coating machine mounting portion of the housing;
A feed tube insertion hole which is provided in the rotation axis of the air motor constituting the coating machine in the axial direction, and has a front end opened to the rotary atomizing head and a rear end opened to the cartridge mounting portion of the housing,
A separate paint cartridge for each color consisting of a cylinder filled with paint and a feed tube extending axially from the tip of the cylinder,
A coating method for a rotary atomizing head type coating apparatus including a cleaning cartridge including a cylinder filled with a cleaning fluid and a feed tube extending in an axial direction from a tip of the cylinder,
Attaching a cylinder of a paint cartridge used for painting to a cartridge attachment portion of the housing, and inserting a feed tube into the feed tube insertion hole;
In the state where the rotary atomizing head is rotated by the air motor, a coating step of supplying paint in the attached paint cartridge toward the rotary atomizing head through a feed tube,
After the coating is completed, a paint cartridge removing step of removing the used paint cartridge from the housing,
A cleaning cartridge mounting step of mounting a cleaning cartridge on the cartridge mounting portion of the housing to clean the pre-color paint adhered to the rotary atomizing head;
A cleaning fluid supply step of supplying a cleaning fluid in the cleaning cartridge to a rotary atomizing head through a feed tube;
Removing the used cleaning cartridge from the housing after the cleaning is completed, and removing the used cleaning cartridge from the housing.

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