JP2014069113A - Washing mechanism for coater, and washing method of coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing mechanism for a coater, that is capable of reliably washing a rear surface of a rotary atomization head without accompanying complication/enlargement of the coater nor deterioration in coating quality.SOLUTION: A washing mechanism 21 for a coater is used for washing a coater 12 having a bell type rotary atomization head 23 at a tip of a coater body 22. The washing mechanism 21 includes: a nozzle support body 41; a washing nozzle 44; a washing liquid supply tube 45; and nozzle support body drive means 51. The nozzle support body 41 supporting the washing nozzle 44 is constituted of a body separate from the coater 12. The nozzle support body drive means 51 drives the nozzle support body 41 so as to be attached to/detached from an outer peripheral surface 22a of the coater body 22. When mounting the nozzle support body 41, the washing nozzle 44 is positioned obliquely downward in a state that its tip is directed toward a rear surface 24a of the rotary atomization head 23.

Description

  The present invention relates to a coating machine cleaning mechanism for cleaning a coating machine, and a coating machine cleaning method.

  In general, a painting robot is mainly used for painting an object such as an automobile body. This painting robot includes an arm that bends, stretches and rotates when painting an object to be painted, and a coating machine that is equipped at the tip of the arm. The painting machine is equipped with a bell-shaped rotary atomizing head. In addition to the operation of painting the object to be coated, the painting robot also performs an operation of blowing away surplus paint generated during color change into a waste paint collection container.

  In addition, when the color is changed, it is necessary to remove the paint adhering to the rotary atomizing head or the like before the next coating is started. If the paint is not removed, there is a possibility that the quality of the coating may be deteriorated due to the attached paint dripping onto the object to be coated. As a method for removing the paint, it has been proposed to wash the rotary atomizing head by spraying a cleaning liquid from the nozzle provided in the waste paint collecting container to the front surface (inner surface) of the rotary atomizing head.

  By the way, since the paint is atomized at the time of painting, it may adhere to the rear surface in addition to the front surface of the rotary atomizing head. Therefore, in order to prevent the coating quality of the object to be coated more reliably, there is a demand for cleaning the rear surface in addition to the front surface of the rotary atomizing head.

  Here, as a mechanism for cleaning the rear surface of the rotary atomizing head, for example, a mechanism in which a cleaning nozzle for spraying a cleaning liquid toward the rear surface of the rotary atomizing head is integrally provided inside the coating machine main body has been proposed in the past. (For example, refer to Patent Document 1). As another mechanism for performing the same cleaning, for example, a nozzle support is fixed near the upper surface opening of the waste paint collection container, and a cleaning nozzle for injecting a cleaning liquid toward the rear surface of the rotary atomizing head is provided. What was supported by the nozzle support body is conventionally proposed (for example, refer patent document 2, 3). In cleaning using these cleaning mechanisms, it is necessary to drive the coating robot at the time of color change to move the coating machine from the coating position to a position where the waste paint recovery container is located. Therefore, a rotary atomizer is inserted into the upper surface opening of the waste paint collection container, and after surplus paint is blown out into the waste paint collection container, the washing liquid is sprayed from the washing nozzle.

JP-A-9-192546 JP 2006-334575 A JP 2011-230034 A

  However, the type of cleaning mechanism in which the cleaning nozzle is fixed on the waste paint recovery container side has the following problems. That is, if the use of the painting robot is continued, the positional accuracy at the time of inserting the rotary atomizing head into the upper surface opening of the waste paint collecting container deteriorates, and the rotary atomizing head may deviate from the position to be originally inserted. is there. In this case, the target position of the cleaning liquid is deviated, and the cleaning liquid does not easily hit the rear surface of the rotary atomizing head, resulting in poor cleaning. Therefore, in such a case, it is necessary to perform troublesome nozzle adjustment work.

  In addition, in the type of cleaning mechanism with a cleaning nozzle inside the coating machine body, even if the accuracy of the insertion position of the rotary atomizing head deteriorates, it is not affected by this, and the target position of the cleaning liquid by the cleaning nozzle is shifted. Does not occur. However, there is a possibility that the cleaning liquid may drip from the cleaning nozzle to the object to be coated during painting, and the coating quality of the object to be coated may be deteriorated. In addition, in this type, the cleaning nozzle is provided in the main body of the coating machine, which makes the structure of the coating machine complex and easy to increase in size. In addition, it is expected that the coating robot will require a large amount of power when moving the coating machine. The

  The present invention has been made in view of the above problems, and its purpose is to reliably clean the rear surface of the rotary atomizing head without complicating / upsizing the coating machine and lowering the coating quality. The object is to provide a coating machine cleaning mechanism and a coating machine cleaning method.

  In order to solve the above-mentioned problem, the invention described in means 1 is used at the time of washing a coating machine having a bell-shaped rotary atomizing head at the tip of a coating machine body attached to the tip of a painting robot, A mechanism for cleaning by spraying a cleaning liquid onto the rear surface of the atomizing head, a nozzle support configured separately from the coating machine, a cleaning nozzle supported by the nozzle support, A cleaning liquid supply pipe for supplying the cleaning liquid to the cleaning nozzle; and a nozzle support driving means for driving the nozzle support to attach and detach the nozzle support to the outer peripheral surface of the coating machine body, A cleaning mechanism for a coating machine, characterized in that, when the nozzle support is attached to the main body of the coating machine, the cleaning nozzle is positioned and arranged obliquely downward with the tip thereof facing the rear surface of the rotary atomizing head. And the gist thereof.

  Therefore, according to the invention described in the means 1, when cleaning the rotary atomizing head, the nozzle support that supports the cleaning nozzle is mounted on the outer peripheral surface of the coating machine main body by driving the nozzle support driving means. Therefore, even if the insertion position accuracy of the rotary atomizing head by the coating robot deteriorates, it is not particularly affected by this, and the displacement of the target position of the cleaning liquid by the cleaning nozzle is prevented. Therefore, it becomes possible to reliably apply the cleaning liquid to the rear surface of the rotary atomizing head, and it is possible to perform the cleaning reliably without performing troublesome adjustment work. Further, when the coating is performed after the cleaning of the rotary atomizing head, the nozzle support that supports the cleaning nozzle can be separated from the outer peripheral surface of the coating machine main body. Therefore, there is no concern that the cleaning liquid will drip from the cleaning nozzle to the object to be coated during the coating process and the coating quality of the object to be coated will deteriorate. In addition, since the cleaning nozzle and the nozzle support are provided separately from the main body of the coating machine, it is possible to avoid complication and enlargement of the coating machine.

  Here, the cleaning liquid is not particularly limited, but when the paint is an aqueous paint, for example, water containing water or a solvent is used. When the paint is a solvent-type paint, for example, a thinner composed of a plurality of types of solvents such as amyl acetate, butyl acetate, ethyl acetate, and toluene is used.

  Although the cleaning nozzle is disposed obliquely downward, specifically, the cleaning nozzle is preferably disposed so as to form an angle of 20 ° to 40 ° with respect to the upper surface of the waste paint collection container. In this way, since the cleaning liquid ejected from the cleaning nozzle is likely to adhere to the rear surface of the rotary atomizing head, it is possible to prevent the cleaning liquid from being scattered around the rotary atomizing head. If the cleaning nozzle is larger than 40 ° with respect to the upper surface, the cleaning liquid sprayed to the rotary atomizing head tends to scatter to the upper side (the rear end side of the rotary atomizing head). On the other hand, when the cleaning nozzle is smaller than 20 ° with respect to the upper surface, the cleaning liquid sprayed to the rotary atomizing head is likely to be scattered on the outer peripheral side of the rotary atomizing head.

  The invention described in Means 2 is that, in the means 1, the nozzle support body includes a joint portion having a support body side engaging portion that is detachable with respect to the coating machine side engaging portion on the outer peripheral surface of the coating machine body. The gist of the present invention is to have an arm portion extending downward from the joint portion and having the cleaning nozzle attached to the tip thereof.

  Therefore, according to the invention described in Means 2, when the nozzle support is mounted, the coating machine side engaging portion and the support side engaging portion are engaged with each other so that the joint portion of the nozzle support is attached to the coating machine main body. Positioning and fixing. In addition, since the cleaning nozzle is attached not to the joint but to the arm extending downward from the joint, the joint can be set at a position somewhat away from the cleaning nozzle. It won't get in the way. Further, with this configuration, the cleaning nozzle can be easily disposed at a position close to the rear surface of the rotary atomizing head.

  The invention described in means 3 is the means 2, wherein the joint portion is detachable from the outer peripheral surface of the coating machine main body, passes through the interior of the coating machine main body and in the vicinity of the rear surface of the rotary atomizing head. The gist is to serve as a cleaning joint for supplying cleaning liquid containing pressurized air to the cleaning liquid path in the coating machine that opens.

  Therefore, according to the invention described in the means 3, when the nozzle support is mounted, not only the cleaning liquid can be supplied to the cleaning nozzle through the cleaning liquid supply pipe existing outside the coating machine, but also the cleaning liquid in the coating machine existing in the coating machine. A cleaning liquid containing pressurized air can also be supplied to the path. That is, by using a nozzle support having a joint that also serves as a cleaning joint, the cleaning liquid can be simultaneously supplied to the two paths. Moreover, according to this structure, compared with what provided the washing | cleaning joint separately, it becomes easy to avoid complication and enlargement of the whole apparatus.

  The gist of the invention described in means 4 is that, in any one of the means 1 to 3, the arm portion has an inclination angle adjusting means for adjusting the inclination angle of the cleaning nozzle. .

  Therefore, according to the invention described in the means 4, by appropriately adjusting the inclination angle of the cleaning nozzle, the target position of the cleaning liquid by the cleaning nozzle can be optimized, and the cleaning liquid can be more reliably applied to the rear surface of the rotary atomizing head. It is possible to hit. Further, since the preferable relative positional relationship between the coating machine main body and the washing nozzle is maintained, the position adjustment of the washing nozzle in the vertical direction and the horizontal direction is not required, and the nozzle adjustment work becomes relatively simple.

  The invention described in means 5 is a coating machine provided with a bell-shaped rotary atomizing head at the tip of the coating machine main body attached to the tip of the painting robot, and sprays a cleaning liquid onto the rear surface of the rotary atomizing head. The cleaning nozzle is supported by the nozzle support by mounting a nozzle support configured separately from the coating machine on the outer peripheral surface of the coating machine main body. A nozzle support mounting step that positions and arranges the tip of the rotary atomizing head so as to be obliquely downward with the tip thereof facing the rear surface of the rotary atomizing head; and the coating robot is driven to place the rotary atomizing head on the upper surface of the cleaning liquid recovery container. After the rotary atomizing head insertion step to be inserted into the opening, the nozzle support mounting step and the rotary atomizing head insertion step, the cleaning liquid is supplied to the cleaning nozzle in a state where the rotary atomizing head is rotated. A cleaning step of spraying the cleaning liquid from the cleaning nozzle to the rear surface of the rotary atomizing head; and after the cleaning step, supply of the cleaning liquid to the cleaning nozzle is stopped, and the nozzle support is applied to the coating The gist of the cleaning method for a coating machine includes a nozzle support body detaching step for detaching from the outer peripheral surface of the machine body.

  Therefore, according to the invention described in the means 5, in the nozzle support mounting step, the nozzle support that supports the cleaning nozzle is mounted on the outer peripheral surface of the coating machine body, so that the rotary atomizing head of the coating robot Regardless of the accuracy of the insertion position, the cleaning nozzle is set at a desired target position. In the rotary atomizing head insertion step, the rotary atomizing head is inserted into the upper surface opening of the cleaning liquid recovery container by driving of the painting robot, and the cleaning can be started. In the cleaning step performed after these steps, the cleaning liquid is supplied to the cleaning nozzle in a state where the rotary atomizing head is rotated, and the cleaning liquid is ejected from the cleaning nozzle to the rear surface of the rotary atomizing head. As a result, the paint adhering to the rear surface of the rotary atomizing head is washed away, and the paint washing drainage liquid is collected in the washing liquid collection container. In the nozzle support removing step performed after the cleaning step, the supply of the cleaning liquid to the cleaning nozzle is stopped, and the nozzle support is detached from the outer peripheral surface of the coating machine main body. As a result, the cleaning liquid does not drip from the cleaning nozzle to the object to be coated during coating, and the complexity and size of the coating machine can be avoided.

  As described above in detail, according to the first to fourth aspects of the present invention, the rear surface of the rotary atomizing head can be reliably cleaned without complicating / upsizing the coating machine and lowering the coating quality. A coating machine cleaning mechanism that can be provided can be provided. Further, according to the invention of claim 5, there is provided a coating machine cleaning method capable of reliably cleaning the rear surface of the rotary atomizing head without complicating / upsizing the coating machine and reducing coating quality. Can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS The whole schematic diagram which shows the coating equipment provided with the washing | cleaning mechanism for coating machines of embodiment which actualized this invention. Schematic which shows the state before mounting | wearing of the nozzle support body in the washing | cleaning mechanism for coating machines of embodiment. Schematic which shows the state after mounting | wearing with the nozzle support body in the washing | cleaning mechanism for coating machines of embodiment. Schematic which shows the washing | cleaning mechanism for coating machines of another embodiment.

  Hereinafter, a cleaning mechanism for a coating machine according to an embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 1 shows a painting facility 1 including a painting robot 11. The painting facility 1 includes a painting machine cleaning mechanism 21 in addition to the painting robot 11. The coating machine cleaning mechanism 21 of the present embodiment is for cleaning the coating machine 12 attached to the coating robot 11. The painting robot 11 is an articulated robot used when performing painting work on an object to be painted (not shown) such as an automobile body. The painting robot 11 includes an arm 13 that bends, stretches and rotates when painting an object to be coated, and a coating machine 12 attached to the tip of the arm 13. The coating machine 12 is configured such that the height and the paint spraying direction are changed by bending and stretching of the arm 13. The arm 13 includes a plurality of motors (not shown) for moving a plurality of joints, and these motors are driven and controlled based on a control signal from the controller 14 which is a control means.

  As shown in FIGS. 1 to 3, the coating machine 12 includes a substantially cylindrical coating machine body 22 and a bell-shaped rotary atomizing head 23. The coating machine body 22 includes a paint container (not shown) filled with paint and a paint supply mechanism (not shown) for supplying the paint in the paint container to the rotary atomizing head 23. The rotary atomizing head 23 is attached to the coating machine body 22 and is rotated by an air motor for rotating the atomizing head provided in the coating machine body 22. When the rotary atomizing head 23 rotates, the paint supplied by a paint supply mechanism (not shown) is scattered and atomized by centrifugal force to the outer peripheral side. The paint supply mechanism and the air motor are driven and controlled based on a control signal from the controller 14.

  The rear part of the rotary atomizing head 23 has a substantially cylindrical shape, and the front part 24 of the rotary atomizing head 23 has a rear surface (tapered surface) 24a whose outer diameter increases toward the front end. The rear surface 24 a is inclined by about 45 ° with respect to the radial direction of the rotary atomizing head 23.

  As shown in FIGS. 2 and 3, a coating machine cleaning liquid path 25 for supplying a cleaning liquid containing pressurized air is provided inside the coating machine main body 22. The coating liquid cleaning fluid path 25 starts from a connection port 26 provided on the outer peripheral surface 22a of the coating machine main body 22, passes through the interior of the coating machine main body 22, and opens near the rear surface 24a of the rotary atomizing head 23. . Therefore, when a cleaning liquid containing pressurized air is supplied from the connection port 26 side, the cleaning liquid is discharged toward the rear surface 24a of the rotary atomizing head 23.

  As shown in FIGS. 1 to 3, the coating machine cleaning mechanism 21 of this embodiment includes a cleaning liquid recovery container 31. The cleaning liquid recovery container 31 is provided separately from the coating machine 12 in the vicinity of the coating robot 11. The cleaning liquid recovery container 31 has a function of recovering a cleaning liquid sprayed from a cleaning nozzle 44, which will be described later, and a function of recovering paint that has been blown off from the coating machine 12 during color change. In the present embodiment, since the cleaning liquid recovery container 31 is made of stainless steel, it is possible to prevent rust caused by the cleaning liquid.

  The cleaning liquid recovery container 31 includes a container body 32 having a substantially cylindrical shape and an upper lid 33 having a substantially disk shape. The container main body 32 has an opening at the upper end and a waste liquid discharge port (not shown) for discharging the waste liquid in the container main body 32 at the lower end. On the other hand, the upper lid 33 is set to have substantially the same diameter as the outer diameter of the container main body 32 and is attached to the container main body 32 so as to cover the opening. An insertion hole 34 (upper surface opening) through which the rotary atomizing head 23 can be inserted into the container main body 32 is provided at the center of the upper lid 33. The insertion hole 34 has a circular shape, and the inner diameter thereof is set to such a size that a gap of 10 mm or more and 50 mm or less is generated between the inserted rotary atomizing head 23.

  As shown in FIG. 1 to FIG. 3, the coating machine cleaning mechanism 21 of this embodiment performs cleaning by spraying the cleaning liquid onto the rear surface 24 a of the rotary atomizing head 23 separately from the cleaning liquid recovery container 31. It has a configuration to do. More specifically, the coating machine cleaning mechanism 21 includes a nozzle support 41, a cleaning nozzle 44, a cleaning liquid supply pipe 45, an air cylinder 51, and the like.

  An air cylinder 51 serving as a nozzle support driving means is fixed horizontally on the upper end of a cylinder support 52 installed in the vicinity of the cleaning liquid recovery container 31. In the present embodiment, the cylinder support 52 is configured separately from the cleaning liquid recovery container 31, but may be formed integrally with the cleaning liquid recovery container 31. An air compressor (not shown) as a pressurized air source is connected in a flow path to an air cylinder 51 which is a kind of fluid pressure actuator. A cylinder driving means 53 such as an air control valve is connected to the air cylinder 51, and a controller 14 is electrically connected to the cylinder driving means 53. Therefore, the cylinder driving means 53 is driven and controlled based on the control signal from the controller 14, and as a result, the air cylinder 51 expands and contracts in the horizontal direction.

  In the present embodiment, the nozzle support 41 is configured separately from the coating machine 12 and the cleaning liquid recovery container 31, and includes a joint portion 42 and an arm portion 43. The joint portion 42 can be attached to and detached from the outer peripheral surface 22a of the coating machine main body 22, and also serves as a cleaning joint for supplying a cleaning liquid containing pressurized air to the above-described cleaning liquid path 25 in the coating machine. The joint portion 42 of the present embodiment has a block shape and is attached to the tip of the air cylinder 51. A plurality of engaging pins 47 as support body side engaging portions are provided on the side surface of the joint portion 42 opposite to the air cylinder 51. On the other hand, on the outer peripheral surface 22 a of the coating machine main body 22, engagement holes 27 are provided as support-side engagement portions that can be engaged and disengaged with respect to the plurality of engagement pins 47. Further, a connection port 48 on the nozzle support 41 side protrudes at a position corresponding to the connection port 26 on the coating machine body 22 side on the side surface of the joint portion 42. The connection port 48 is connected to the cleaning liquid supply pipe 46 in a flow path via an internal flow path 49. A cleaning liquid containing pressurized air is supplied from the cleaning liquid supply pipe 46 (see arrow R1 in FIGS. 1 and 3).

  In the present embodiment, the arm portion 43 is provided so as to extend downward from the joint portion 42. However, the tip (lower end) of the arm portion 43 is set in advance so as to be slightly higher than the upper lid 33 in order to avoid interference with the upper lid 33 of the cleaning liquid recovery container 31. A cleaning nozzle 44 is attached to the tip of the arm portion 43. The cleaning nozzle 44 of this embodiment is provided with two cleaning liquid injection tubes extending in the same direction. Each of the cleaning liquid ejection pipes is bent in a substantially square shape, and its tip is disposed so as to be obliquely downward. Specifically, the angle (inclination angle) formed by the tip of each cleaning liquid ejection tube with respect to the upper lid 33 is set to be about 30 °. The tip position of the cleaning nozzle 44 is also set in advance so as to be slightly higher than the upper lid 33.

  An adjustment screw 56 as an inclination angle adjusting means is provided at the tip of the arm portion 43. Accordingly, the tilt angle of the cleaning nozzle 44 can be adjusted by rotating the adjusting screw 56. In the present embodiment, the inclination angle of the cleaning nozzle 44 can be adjusted, but no means for adjusting the position of the cleaning nozzle in the vertical direction or the horizontal direction is provided.

  Further, another cleaning liquid supply pipe 45 is connected to the rear end of the cleaning nozzle 44 in a flow path. A cleaning liquid that does not include pressurized air is supplied from the cleaning liquid supply pipe 45 (see arrow R2 in FIGS. 1 and 3). Accordingly, the cleaning liquid is ejected from the front end of the cleaning nozzle 44 obliquely downward.

  Next, the operation of the coating machine cleaning mechanism 21 (cleaning method of the coating machine 12) will be described.

  First, when the painting of the object to be coated by the coating machine 12 is completed and it is necessary to change the color when painting the next object to be coated, the controller 14 drives the arm 13 to move the coating machine 12 to a predetermined value. Move along the movement path. When the coating machine 12 reaches the upper position of the insertion hole 34, the controller 14 drives the arm 13 to lower the coating machine 12, so that only the rotary atomizing head 23 is recovered through the insertion hole 34. It is made to insert in the container 31 (rotating atomizing head insertion step shown in FIG. 2). Thereafter, the controller 14 drives the coating machine 12 to spray the paint, whereby the paint in the coating machine 12 is discharged into the cleaning liquid collection container 31. After this step, the rotary atomizing head 23 can be cleaned.

  Since the air cylinder 51 is still contracted at this time, the joint portion 42 is at a retracted position away from the coating machine 12 and the nozzle support 41 is not attached to the coating machine body 22. Yes. Therefore, the cleaning nozzle 44 is also separated from the rotary atomizing head 23.

  Subsequently, the controller 14 drives the air cylinder 51 to extend so that the joint portion 42 comes close to the outer peripheral surface 22 a of the coating machine body 22. Then, each engagement pin 47 provided in the joint part 42 engages with each engagement hole 27, and the connection ports 26 and 48 are connected to each other. And the nozzle support body 41 will be in the state with which it was mounted | worn with respect to the outer peripheral surface 22a of the coating machine main body 22 (nozzle support body mounting | wearing step shown in FIG. 3). At this time, the cleaning nozzle 44 supported by the arm portion 43 is positioned so as to be close to the rotary atomizing head 23 and obliquely downward with its tip directed toward the rear surface 24a of the rotary atomizing head 23. Accordingly, after this step, the cleaning nozzle 44 is set at a desired target position regardless of the accuracy of the insertion position accuracy of the rotary atomizing head 23 by the painting robot 11.

  Next, the controller 14 drives the air motor to rotate the rotary atomizing head 23 at 15000 rpm. In this state, the controller 14 drives a pump (not shown) to supply the cleaning liquid to the cleaning nozzle 44 and ejects the cleaning liquid from the respective cleaning liquid injection pipes toward the rear surface 24a of the rotary atomizing head 23. At the same time, another pump (not shown) is driven to supply a cleaning liquid containing pressurized air, and the cleaning liquid is discharged from the cleaning liquid path 25 in the coating machine toward the rear surface 24a of the rotary atomizing head 23 (cleaning step). As a result, the paint adhering to the rear surface 24 a of the rotary atomizing head 23 is washed away, and the paint washing waste liquid is collected in the washing liquid collection container 31. After spraying the cleaning liquid for a predetermined time (less than 1 s in this embodiment), the controller 14 stops driving the air motor and stops supplying the cleaning liquid to the cleaning nozzle 44 and the like. However, the rotary atomizing head 23 continues to rotate for a certain time by the action of inertial force. Thereby, the cleaning liquid and paint adhering to the rotary atomizing head 23 are scattered to the outer peripheral side by centrifugal force, and the rotary atomizing head 23 is dried.

  After the supply of the cleaning liquid to the cleaning nozzle 44 and the like is stopped and the rotary atomizing head 23 is dried to some extent, the controller 14 drives the air cylinder 51 to contract, and the joint portion 42 is moved to the outer periphery of the coating machine main body 22. Separated from the surface 22a. Then, each engagement pin 47 is removed from each engagement hole 27 and the connection between the connection ports 26 and 48 is released. As a result, the nozzle support 41 is detached from the outer peripheral surface 22a of the coating machine main body 22 to return to the non-mounted state, and a series of cleaning operations by the coating machine cleaning mechanism 21 is completed (nozzle support removing step).

  When the cleaning operation is completed, the paint container in the coating machine main body 22 is filled with the next color paint and the color is changed. Thereafter, the controller 14 moves the rotary atomizing head 23 to the outside of the cleaning liquid recovery container 31 by driving the arm 13 to raise the coating machine 12. Further, the controller 14 drives the arm 13 to move the painting machine 12 to the painting work start position, and then drives the painting machine 12 to start painting the next object to be painted.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) According to the coating machine cleaning mechanism 21 of the present embodiment, the nozzle support 41 that supports the cleaning nozzle 44 is driven by the air cylinder 51 when the rotary atomizing head 23 is cleaned. It is attached to 22a. Therefore, even if the insertion position accuracy of the rotary atomizing head 23 by the coating robot 11 deteriorates, it is not particularly affected by this, and the displacement of the target position of the cleaning liquid by the cleaning nozzle 44 is prevented. Accordingly, it becomes possible to reliably apply the cleaning liquid to the rear surface 24a of the rotary atomizing head 23, and it is possible to perform the cleaning reliably without performing troublesome adjustment work.

  (2) Also, according to the coating machine cleaning mechanism 21, the nozzle support 41 that supports the cleaning nozzle 44 is removed from the outer peripheral surface 22 a of the coating machine body 22 when the rotary atomizing head 23 is cleaned and coated. You can leave it. Therefore, there is no concern that the cleaning liquid will drip from the cleaning nozzle 44 to the object to be coated during the coating process and the coating quality of the object to be coated will deteriorate. In addition, since the cleaning nozzle 44 and the nozzle support 41 are provided separately from the coating machine main body 22, it is possible to avoid complication and enlargement of the coating machine 12.

  (3) In the case of this coating machine cleaning mechanism 21, the nozzle support 41 employs a configuration having a joint portion 42 and an arm portion 43. The joint portion 42 is provided with engagement pins 47 that can be engaged with and disengaged from the engagement holes 27 in the outer peripheral surface 22a of the coating machine body 22. A cleaning nozzle 44 is attached to the tip of an arm portion 43 that extends downward from the joint portion 42. Therefore, when the nozzle support body 41 is mounted, the engagement holes 27 and the engagement pins 47 are engaged, whereby the joint portion 42 of the nozzle support body 41 can be positioned and fixed with respect to the coating machine body 22. it can. Further, as a result of attaching the cleaning nozzle 44 to the arm portion 43 instead of the joint portion 42, the joint portion 42 can be set at a position somewhat away from the cleaning nozzle 44, and the joint portion 42 does not interfere with the rotary atomizing head 23. . Further, this configuration has an advantage that the cleaning nozzle 44 can be easily disposed at a position close to the rear surface 24a of the rotary atomizing head 23.

  (4) In the case of this coating machine cleaning mechanism 21, the joint portion 42 also serves as a cleaning joint for supplying cleaning liquid containing pressurized air to the cleaning liquid path 25 in the coating machine. Accordingly, when the nozzle support 41 is mounted, not only the cleaning liquid can be supplied to the cleaning nozzle 44 via the cleaning liquid supply pipe 45 existing outside the coating machine 12 but also the cleaning liquid path 25 in the coating machine existing in the coating machine 12. Also, it becomes possible to supply a cleaning liquid containing pressurized air. That is, by using the nozzle support body 41 having the joint portion 42 that also serves as a cleaning joint, the cleaning liquid can be simultaneously supplied to the two paths. Moreover, according to this structure, compared with what provided the washing | cleaning coupling separately, there exists an advantage that it becomes easy to avoid complication and the enlargement of the whole apparatus.

  (5) In the case of the washing machine 21 for the coating machine, the inclination angle of the cleaning nozzle 44 can be adjusted as appropriate by providing the arm 43 with the adjusting screw 56 as the inclination angle adjusting means. Therefore, the target position of the cleaning liquid by the cleaning nozzle 44 can be optimized, and the cleaning liquid can be more reliably applied to the rear surface 24a of the rotary atomizing head 23. Further, since the preferable relative positional relationship between the coating machine main body 22 and the cleaning nozzle 44 is maintained, the position adjustment of the cleaning nozzle 44 in the vertical direction and the horizontal direction is not required, and the nozzle adjustment work becomes relatively simple. There is an advantage.

  In addition, you may change this embodiment as follows.

  In the coating machine cleaning mechanism 21 of the above embodiment, the joint portion 42 of the nozzle support 41 also serves as a cleaning joint for supplying a cleaning liquid containing pressurized air to the cleaning liquid path 25 in the coating machine. However, the present invention is not limited to this. For example, a joint portion 42B and a cleaning joint 42A are configured separately as in a nozzle support 41A of a coating machine cleaning mechanism 21 of another embodiment shown in FIG. Also good. In FIG. 4, an air cylinder 51A for driving the joint portion 42B and an air cylinder 51B for driving the cleaning joint 42A are provided.

  In the above embodiment, the air cylinder 51 is employed as the nozzle support driving means, but the present invention is not limited to this, and a fluid pressure actuator other than the air cylinder 51 is employed, or a power source other than fluid pressure (for example, It is possible to employ an actuator using electric power.

  In the above embodiment, a plurality of engagement holes 27 are provided as the coating machine side engagement portion, and a plurality of engagement pins 47 are provided as the support body side engagement portion. However, their shape, number, arrangement position, etc. It can be changed as appropriate.

  In the above embodiment, the nozzle support 41 has the joint portion 42 and the arm portion 43. For example, the arm portion 43 is omitted and the cleaning nozzle 44 is directly supported by a part of the joint portion 42. It is good also as a structure.

  In the above embodiment, the adjustment screw 56 is adopted as the inclination angle adjusting means. However, the inclination angle may be adjusted by means other than the adjustment screw 56. The configuration may be omitted.

DESCRIPTION OF SYMBOLS 11 ... Coating robot 12 ... Coating machine 21 ... Coating machine cleaning mechanism 22 ... Coating machine body 22a ... Outer peripheral surface 23 ... Rotating atomizing head 24a ... Rear surface of rotating atomizing head 25 ... Coating machine cleaning liquid path 27 ... Coating machine side Engaging hole 31... Cleaning liquid collection container 34... Insertion hole 41 and 41 A as upper surface opening portion Nozzle support 42 and 42 B. Joint portion 43. Arm portion 44 ... Cleaning nozzle 45 ... Cleaning liquid supply pipe 47. Engagement pin 51 as body side engaging portion 51. Air cylinder 56 as nozzle support driving means 56... Adjustment screw as inclination angle adjusting means

Claims (5)

Used when cleaning a sprayer equipped with a bell-shaped rotary atomizing head at the tip of the coating machine main body attached to the tip of the painting robot, and cleaning is performed by spraying a cleaning liquid onto the rear surface of the rotary atomizing head. A mechanism to perform,
A nozzle support configured separately from the coating machine;
A cleaning nozzle supported by the nozzle support;
A cleaning liquid supply pipe for supplying the cleaning liquid to the cleaning nozzle;
Nozzle support driving means for driving the nozzle support to detach the nozzle support with respect to the outer peripheral surface of the coating machine body, and when the nozzle support is mounted on the coating machine body, the cleaning is performed. A cleaning mechanism for a coating machine, characterized in that the nozzle is positioned and arranged obliquely downward with its tip directed toward the rear surface of the rotary atomizing head.   The nozzle support includes a joint portion having a support-side engagement portion that can be engaged with and disengaged from a coating machine-side engagement portion on an outer peripheral surface of the coating machine body, and extends downward from the joint portion. The cleaning mechanism for a coating machine according to claim 1, further comprising an arm portion having the cleaning nozzle attached to a tip thereof.   The joint portion is detachable from the outer peripheral surface of the coating machine main body, and pressurized air is supplied to the cleaning liquid path in the coating machine that passes through the interior of the coating machine main body and opens near the rear surface of the rotary atomizing head. The cleaning mechanism for a coating machine according to claim 2, wherein the cleaning mechanism also serves as a cleaning joint for supplying a cleaning liquid.   The cleaning mechanism for a coating machine according to any one of claims 1 to 3, wherein the arm portion includes an inclination angle adjusting means for adjusting an inclination angle of the cleaning nozzle. In a coating machine equipped with a bell-shaped rotary atomizing head at the tip of the coating machine main body attached to the tip of the painting robot, cleaning is performed by spraying a cleaning liquid onto the rear surface of the rotary atomizing head. And
By attaching a nozzle support configured separately from the coating machine to the outer peripheral surface of the coating machine main body, the cleaning nozzle supported by the nozzle support has the tip of the rotary atomizing head. A nozzle support mounting step for positioning and arranging so as to be obliquely downward in a state facing the rear surface;
A rotary atomizing head insertion step of driving the coating robot to insert the rotary atomizing head into the upper surface opening of the cleaning liquid recovery container;
After the nozzle support mounting step and the rotary atomizing head insertion step, the cleaning liquid is supplied to the cleaning nozzle in a state where the rotary atomizing head is rotated, and from the cleaning nozzle to the rear surface of the rotary atomizing head. A cleaning step of spraying the cleaning liquid on the surface;
A nozzle support removing step of stopping the supply of the cleaning liquid to the cleaning nozzle after the cleaning step, and releasing the nozzle support from the outer peripheral surface of the coating machine main body. Cleaning method.

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