JP2014223566A - Waste liquid recovery apparatus and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste liquid recovery apparatus which can unfailingly liquefy an atomized waste liquid by using a simple structure while inhibiting scattering caused by the waste liquid bouncing back when the waste liquid is recovered during cleaning of a paint gun having a bell shaped spray head, and to provide a waste liquid recovery method.SOLUTION: A waste liquid recovery apparatus 100 recovers a waste liquid during cleaning of a paint gun 3 having a bell cup 11 and includes: a box body 1 where an insertion hole 4, into which a tip part of the paint gun 3 is inserted, is formed on an upper surface; a waste liquid reception part 8 which is provided at a lower part of the box body 1 and receives the waste liquid; a waste liquid feeding pipe 9 which is connected with the waste liquid reception part 8 and feeds the waste liquid in the waste liquid reception part 8; and a cylindrical cover member 5 which is connected with a periphery of the insertion hole 4 of the box body 1 and encloses a shaping air discharge part 10 provided at the paint gun 3 during the cleaning.

Description

  The present invention relates to a waste liquid recovery apparatus and method, and more particularly, to a waste liquid recovery apparatus and method for recovering waste liquid during cleaning of a paint gun having a bell-type spray head.

  When a paint is applied to a workpiece in a painting booth or the like, a rotary atomizing coating apparatus having a painting gun having a bell-type spray head (hereinafter also referred to as “bell cup”) is often used. The rotary atomizing coating apparatus sprays the paint atomized (atomized) by the centrifugal force when the bell cup of the coating gun rotates onto the workpiece by shaping air.

  This type of rotary atomizing coating equipment switches the types of supplies such as paint guns that spray paint toward the workpiece, multiple paint tanks that store paints of different colors, and paint that is supplied to the paint gun. The color changing device includes a circulation pipe arranged so that the paint circulates between each paint tank and the color changing device, a supply pipe connecting the color changing device and the coating gun, and the like. A discharge pump is provided in the middle of the circulation pipe. Then, the painting tank is selected according to the painting color to be painted on the workpiece, and painting is performed.

  When the paint color to be applied to the workpiece is changed, if the previous color paint remains on the downstream side from the color changing device, color mixing occurs between the paint to be applied next. For this reason, the previous color paint remaining in the downstream pipe from the color changing device is discarded, and the paint remaining in the pipe and the paint gun is washed with a cleaning liquid such as thinner. In order to reuse the thinner used for the cleaning, the waste liquid containing the thinner at the time of cleaning is recovered using a waste liquid recovery device.

  As a background art of such a waste liquid recovery apparatus, there is a technique described in JP 2012-35164 A (Patent Document 1). In this publication, a filter-like first atomizing waste liquid collecting part made of a metal wire is provided in the housing of the waste liquid recovery device in order to reduce the scattering of the waste liquid around the device when recovering the sprayed waste liquid. Disposed technology is disclosed (see paragraph [0007]).

  According to this technique, the waste liquid containing atomized thinner and paint particles is sprayed by air to the first atomization waste liquid collection part and collected by the metal wire of the first atomization waste liquid collection part. Thus, the fine particles are converted into droplets. On the other hand, since air flows downward from the gap between the metal wires, air bounce on the surface of the first atomization waste liquid collecting part is suppressed, and thus the waste liquid generated due to the air bounce is suppressed. Bounce is reduced and the scattering of waste liquid outside the housing is prevented (see paragraph [0008]).

JP2012-35164A

  However, in the technique described in Patent Document 1, when the atomized waste liquid is sprayed onto the first atomization waste liquid collecting section with air, not all of the air passes through the gaps between the metal wires. A part of is inevitably bounced on the surface of the first atomization waste liquid collecting part. For this reason, with the bounced air flow, there is a possibility that thinner and paint particles, which are atomized waste liquid, are scattered and adhered to the periphery of the apparatus and the coating gun.

  Moreover, since the technique described in Patent Document 1 is difficult to reliably liquefy (drop into droplets) the atomized waste liquid by using only the first atomization waste liquid collection part, the first atomization waste liquid collection part A second atomizing waste liquid collecting section composed of a plurality of mountain-shaped deflecting plates with a cross-sectional mountain shape arranged in a staggered manner is further disposed below (see paragraph [0007]). This complicates the structure and increases the cost.

  The present invention has been made in view of the circumstances as described above, and when collecting the waste liquid at the time of cleaning the paint gun having a bell-shaped spray head, the atomized waste liquid is obtained by a simple configuration. It is an object of the present invention to provide a waste liquid recovery apparatus and method that can reliably liquefy while suppressing scattering due to rebound.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a waste liquid recovery device for recovering a waste liquid at the time of cleaning a paint gun having a bell-shaped spray head, and inserting a tip portion of the paint gun. A box body having an insertion hole formed on the upper surface, a waste liquid receiving portion that is provided at a lower portion of the box body and that receives the waste liquid, and a waste liquid that is connected to the waste liquid receiving portion and delivers the waste liquid in the waste liquid receiving portion. A delivery pipe and a cylindrical cover member connected to a peripheral edge of the insertion hole of the box and containing a shaping air discharge part provided in the coating gun at the time of cleaning are provided.

According to the present invention, when the tip of the coating gun is inserted into the insertion hole of the box and the shaping air is discharged from the shaping air discharge portion disposed so as to be included in the cover member during cleaning, the cover member A negative pressure is generated in the space between the inner surface of the tube and the shaping air discharge part. With this negative pressure, the direction of the shaping air is expanded radially outward. For this reason, the atomized (misted) waste liquid is sprayed from the tip edge of the spray head while forming a spray pattern in which the spray width becomes larger by shaping air. Therefore, the atomized waste liquid flows downward by being struck strongly against the side wall of the box, in a direction closer to the vertical, and at a closer distance from the coating gun. Thereby, liquefaction of the atomized waste liquid is promoted. The liquefied waste liquid is received by the waste liquid receiving portion, and then sent to the outside through the waste liquid delivery pipe and collected.
At this time, a part of the waste liquid that is struck and liquefied by the side wall of the box body is scattered by impact, but since the scattering direction is directed downward, it is suppressed from adhering to the surface of the coating gun. Even if some waste liquid remains in the flow of shaping air after it collides with the side wall, the shaping air flow is directed downward, so that the waste liquid flows on the surface of the paint gun along with the shaping air flow. Adhesion is suppressed. As a result, for example, waste liquid adheres to the spray head of the coating gun, drops off during the next painting, adheres to the object to be coated, and the coating quality is prevented from being impaired. Furthermore, even if the atomized waste liquid scatters upward after colliding with the side wall of the box, the tip of the coating gun is covered with a cover member, so it adheres to the surface of the coating gun. Or splashing outward from the box is suppressed.
That is, when recovering waste liquid during cleaning of a paint gun having a bell-shaped spray head, waste liquid recovery can be reliably liquefied with a simple configuration while suppressing splashing due to splashing. Equipment can be provided.

  The invention according to claim 2 is the waste liquid recovery apparatus according to claim 1, wherein an inner diameter of the cover member is larger than an outer diameter of the shaping air discharge portion, and the spray head in the coating gun is disposed. It is characterized in that it is smaller than the outer diameter of the main body barrel portion that is rotatably mounted.

  According to such a configuration, the space between the inner surface of the cover member and the shaping air discharge portion can be made relatively narrow, and the negative pressure in the space can be generated more effectively. Therefore, the atomized waste liquid reliably forms a spray pattern having a larger spray width by the generated negative pressure and collides with the side wall. Thereby, liquefaction of the atomized waste liquid is more reliably promoted.

  The invention according to claim 3 is the waste liquid recovery apparatus according to claim 1 or 2, further comprising a cylindrical filter member provided in the box and having a horizontal cross-sectional area that decreases downward. And the peripheral edge of the upper end of the filter member is in contact with the inner surface of the box.

According to such a configuration, the atomized waste liquid flows downward by being struck strongly against the inner surface of the filter member in a direction closer to the vertical and closer to the coating gun. . Thereby, liquefaction of the atomized waste liquid is promoted. The paint of the liquefied waste liquid is generally collected by the filter member. On the other hand, the cleaning liquid such as thinner used for cleaning of the liquefied waste liquid is received by the waste liquid receiving portion and then passed through the waste liquid delivery pipe. It is sent out and collected. Accordingly, it is possible to simplify or eliminate the work of separating the waste liquid into the paint and the thinner on the downstream side of the waste liquid delivery pipe.
At this time, a part of the waste liquid that is struck and liquefied against the inner surface of the filter member scatters due to the impact, but since the scattering direction is directed downward, it is suppressed from adhering to the surface of the coating gun. Even if some waste liquid remains in the flow of shaping air after it collides with the filter member, the waste air is directed to the surface of the coating gun because the shaping air flow is directed downward. Adhering to is suppressed. Further, the rebound of the shaping air is attenuated by the filter member in the event of a collision. Furthermore, even if the atomized waste liquid scatters upward after a collision with the filter member, the tip of the coating gun is covered with the cover member, so that it adheres to the surface of the coating gun. Scattering outward from the box is suppressed.

  A fourth aspect of the present invention is the waste liquid recovery apparatus according to the third aspect, wherein the filter member includes a bottom portion that is connected to a lower end portion of the filter member and has an opening at the center. And

  According to such a configuration, more paint in the liquefied waste liquid is collected by the filter member, so that the waste liquid separation operation on the downstream side can be simplified or eliminated.

  In order to solve the above-mentioned problem, the invention according to claim 5 is a waste liquid recovery method for recovering waste liquid at the time of cleaning a paint gun having a bell-type spray head, wherein the insertion is formed on the upper surface of the box. An arrangement step of inserting a tip portion of the coating gun into the hole and arranging a shaping air discharge portion provided in the coating gun inside a cylindrical cover member connected to a peripheral edge of the insertion hole of the box body; A spraying step of spraying the waste liquid by supplying the cleaning liquid to the coating gun while rotating the spray head and discharging the shaping air from the shaping air discharge unit; and a waste liquid reception provided at the lower part of the box A recovery step of recovering the waste liquid received by the portion, and in the spraying step, a negative generated in a space between the inner surface of the cover member and the shaping air discharge portion. By, characterized in that widening the shaping air direction radially outward.

According to the present invention, the atomized (atomized) waste liquid is sprayed from the tip edge of the spray head while forming a spray pattern in which the spray width is increased by the shaping air. Therefore, the atomized waste liquid flows downward by being struck strongly against the side wall of the box, in a direction closer to the vertical, and at a closer distance from the coating gun. Thereby, liquefaction of the atomized waste liquid is promoted. The liquefied waste liquid is received by the waste liquid receiving portion, and then sent out to be collected.
At this time, a part of the waste liquid that is struck and liquefied by the side wall of the box body is scattered by impact, but since the scattering direction is directed downward, it is suppressed from adhering to the surface of the coating gun. Even if some waste liquid remains in the flow of shaping air after it collides with the side wall, the shaping air flow is directed downward, so that the waste liquid flows on the surface of the paint gun along with the shaping air flow. Adhesion is suppressed. As a result, for example, waste liquid adheres to the spray head of the coating gun, drops off during the next painting, adheres to the object to be coated, and the coating quality is prevented from being impaired. Furthermore, even if the atomized waste liquid scatters upward after colliding with the side wall of the box, the tip of the coating gun is covered with a cover member, so it adheres to the surface of the coating gun. Or splashing outward from the box is suppressed.
That is, when recovering waste liquid during cleaning of a paint gun having a bell-shaped spray head, waste liquid recovery can be reliably liquefied with a simple configuration while suppressing splashing due to splashing. Can provide a method.

  According to the present invention, when recovering waste liquid at the time of cleaning a paint gun having a bell-shaped spray head, the atomized waste liquid is reliably liquefied while suppressing splashing due to rebound by a simple configuration. It is possible to provide a waste liquid recovery apparatus and method capable of

It is a schematic longitudinal cross-sectional view which shows the state by which the front-end | tip part of the coating gun was inserted in the waste liquid collection | recovery apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is a schematic longitudinal cross-sectional view which shows the state by which the front-end | tip part of the coating gun was inserted in the waste liquid collection | recovery apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing which follows the BB line of FIG. It is a schematic longitudinal cross-sectional view which shows the state by which the front-end | tip part of the coating gun was inserted in the waste liquid collection | recovery apparatus which concerns on 3rd Embodiment of this invention. It is sectional drawing which follows the CC line of FIG.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
Note that, in the drawings shown below, the same members or corresponding members are denoted by the same reference numerals, and redundant description is omitted as appropriate. In addition, the size and shape of the member may be schematically represented by being modified or exaggerated for convenience of explanation.

[First Embodiment]
First, with reference to FIG. 1 and FIG. 2, the waste liquid collection | recovery apparatus 100 which concerns on 1st Embodiment of this invention is demonstrated. FIG. 1 is a schematic longitudinal sectional view showing a state in which a tip end portion of a coating gun 3 is inserted into the waste liquid recovery apparatus 100 according to the first embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG.

  As shown in FIG. 1, the waste liquid recovery apparatus 100 is a waste liquid recovery apparatus that recovers a waste liquid containing a cleaning liquid such as a thinner and a paint when the coating gun 3 having a bell cup 11 that is a bell-type spray head is cleaned. The coating gun 3 includes a main body trunk portion 17 on which the bell cup 11 is rotatably mounted, and is attached to, for example, the tip of a robot arm (not shown).

  When painting, the coating gun 3 applies the coating material supplied to the inner surface 11b of the bell cup 11 from a large number of coating material supply holes 11c arranged on the circumference by the centrifugal force when the bell cup 11 rotates. And is discharged from the cup tip edge 11a. Thereby, the paint is atomized (atomized) and is coated by a high-speed air flow called shaping air discharged from the shaping air discharge unit 10 provided behind the bell cup 11 (opposite to the spraying direction). The course is guided in the direction of the workpiece (not shown).

  As shown in FIGS. 1 and 2, the waste liquid recovery apparatus 100 includes a box 1, a waste liquid receiving portion 8, a waste liquid delivery pipe 9, and a cover member 5.

  The box 1 is a cylindrical box here, and has an upper wall 2, a bottom wall 7, and a cylindrical side wall 14. However, the box 1 is not limited to a cylindrical box, and may be a box whose outer shape is a truncated cone shape, a rectangular parallelepiped shape, a truncated pyramid shape, or the like. In addition, the horizontal direction dimension (diameter direction dimension) and height dimension of the box 1 can be set as appropriate.

  In the upper wall 2 forming the upper surface of the box 1, an insertion hole 4 for inserting the tip of the coating gun 3 is opened. The insertion hole 4 is formed to have a diameter through which at least the shaping air discharge part 10 of the coating gun 3 can be inserted. Here, the shaping air discharge part 10 points out the exit from which shaping air is discharged.

  The waste liquid receiving part 8 is provided on the lower part in the box 1, here on the bottom wall 7. The waste liquid receiving portion 8 has a substantially dish shape and has a function of receiving waste liquid. The waste liquid delivery pipe 9 is connected to the waste liquid receiving part 8 and has a function of sending the waste liquid in the waste liquid receiving part 8. Here, the waste liquid delivery pipe 9 is connected to the lowest region of the waste liquid receiving part 8 so that the waste liquid in the waste liquid receiving part 8 can be efficiently delivered.

  The cover member 5 has a cylindrical shape, is connected to the peripheral edge of the insertion hole 4 of the box 1, and has an inner diameter that allows at least the shaping air discharge part 10 of the coating gun 3 to be inserted. The cover member 5 contains the shaping air discharge part 10 of the coating gun 3 at the time of cleaning. That is, the shaping air discharge unit 10 is arranged inside (inside) the cover member 5 in the radial direction during cleaning.

It is preferable that the inner diameter of the cover member 5 is formed such that the distal end portion of the coating gun 3 can be inserted and the proximal end portion of the coating gun 3 cannot be inserted. That is, the inner diameter D ₁ of the cover member 5 is set to be larger than the outer diameter D ₀ of the shaping air discharge part 10 and smaller than the outer diameter D ₂ of the main body trunk part 17 of the coating gun 3. The outer diameter D < _b > ₂ of the main body trunk portion 17 is an outer diameter of a cylindrical portion of the main body trunk portion 17 located on the proximal end side with respect to the distal end portion of the coating gun 3. According to such a configuration, the space S1 between the inner surface of the cover member 5 and the shaping air discharge unit 10 can be made relatively narrow, and negative pressure in the space S1 described later can be generated more effectively.

  Further, the lower end of the cover member 5 is positioned above the cup tip edge 11a of the coating gun 3 (in the direction opposite to the spraying direction) during cleaning. Therefore, the discharge of the atomized waste liquid from the cup tip edge 11a of the bell cup 11 is not hindered.

  Connected to the upper portion of the side wall 14 of the box 1 is an exhaust pipe 13 that discharges the shaping air discharged from the shaping air discharge portion 10 of the coating gun 3 to the inside of the box 1 to the outside of the box 1 during cleaning. Yes.

Next, a waste liquid recovery method using the waste liquid recovery apparatus 100 configured as described above will be described.
For example, when changing the paint color to be applied to the workpiece or when performing a regular cleaning operation, a cleaning solution such as thinner is applied to the coating gun 3 via a color changing device (not shown) and a supply pipe (not shown). Then, the supply piping from the color changing device to the coating gun 3 and the cleaning of the coating gun 3 are performed.

  As shown in FIG. 1, at the time of cleaning, an arrangement process of the coating gun 3 is first performed. In this arrangement step, the tip end portion of the coating gun 3 is inserted into the insertion hole 4 formed on the upper surface of the box 1, and the inside of the cylindrical cover member 5 connected to the periphery of the insertion hole 4 of the box 1. This is a step of arranging the shaping air discharge portion 10 provided in the coating gun 3.

  Specifically, for example, by moving a robot arm (not shown), the tip of the painting gun 3 attached to the tip of the robot arm is formed on the upper surface of the box 1 of the waste liquid recovery apparatus 100. It is inserted into the hole 4. At this time, the shaping air discharge part 10 of the coating gun 3 is enclosed by the cover member 5. That is, the shaping air discharge part 10 is disposed inside the cover member 5. Further, the cup tip edge 11 a of the coating gun 3 is positioned below the lower end of the cover member 5.

  Subsequently, a waste liquid spraying step is performed. This spraying step is a step of supplying the cleaning liquid to the coating gun 3 while rotating the bell cup 11 and discharging the waste liquid by discharging the shaping air from the shaping air discharge unit 10.

  Specifically, the thinner is supplied to the coating gun 3 via a supply pipe (not shown) with the tip of the coating gun 3 inserted into the insertion hole 4 of the box 1 of the waste liquid recovery apparatus 100. The The paint gun 3 guides the waste liquid containing paint and thinner remaining in the supply pipe and the paint gun 3 to the inner surface 11b from the paint supply hole 11c of the rotating bell cup 11, and from the cup tip edge 11a by centrifugal force. Atomized and released. The atomized waste liquid is guided into the box 1 of the waste liquid recovery apparatus 100 by the shaping air discharged from the shaping air discharge unit 10.

  Here, when the shaping air is discharged from the shaping air discharge portion 10 disposed so as to be included in the cover member 5, a negative pressure is generated in the space S <b> 1 between the inner surface of the cover member 5 and the shaping air discharge portion 10. Occur. By this negative pressure, the direction of the shaping air is expanded radially outward as indicated by D in FIG.

  For this reason, the atomized (atomized) waste liquid is sprayed from the cup tip edge 11a of the bell cup 11 in a spray pattern E in which the spray width becomes larger by the shaping air. Therefore, the atomized waste liquid is struck strongly against the side wall 14 of the box 1 in a direction closer to the vertical and closer to the coating gun 3 and flows down. Thereby, liquefaction of the atomized waste liquid is promoted.

  At this time, a part of the waste liquid that is struck and liquefied by the side wall 14 of the box body 1 is scattered due to the impact, but since the scattering direction is directed downward, it is suppressed from adhering to the surface of the coating gun 3. The Even if some waste liquid remains in the flow of the shaping air after the collision with the side wall 14, since the shaping air flow is directed downward, the waste liquid flows into the coating gun 3 along with the shaping air flow. Adhering to the surface is suppressed. As a result, for example, waste liquid adheres to the inner surface 11b of the bell cup 11 of the coating gun 3 and is prevented from dropping during the next coating and adhering to the workpiece, thereby impairing the coating quality. Further, even if the atomized waste liquid is scattered upward in the event of a collision with the side wall of the box, for example, in the direction indicated by F in FIG. 1, the tip of the coating gun 3 is surrounded by the cover member 5. Is covered with the surface of the coating gun 3 and is prevented from splashing outward from the box 1.

  Subsequently, a recovery process for recovering the liquefied waste liquid is performed. This recovery step is a step of recovering the waste liquid received in the waste liquid receiving portion 8 provided in the lower part of the box 1. Specifically, the liquefied waste liquid is received by the waste liquid receiving portion 8 and then sent from the waste liquid receiving portion 8 to the outside of the box 1 through the waste liquid delivery pipe 9 and collected.

  As described above, in the present embodiment, the waste liquid recovery apparatus 100 that recovers the waste liquid during the cleaning of the coating gun 3 having the bell cup 11 is a box in which the insertion hole 4 for inserting the tip end portion of the coating gun 3 is formed on the upper surface. A body 1, a waste liquid receiving portion 8 that is provided in the lower part of the box 1 and receives waste liquid, a waste liquid delivery pipe 9 that is connected to the waste liquid reception portion 8 and sends waste liquid in the waste liquid reception portion 8, and a box And a cylindrical cover member 5 which is connected to the peripheral edge of one insertion hole 4 and encloses a shaping air discharge part 10 provided in the coating gun 3 at the time of cleaning.

  According to this embodiment, when collecting the waste liquid at the time of cleaning the coating gun 3 having the bell cup 11 which is a bell-type spray head, the atomized waste liquid is rebounded by a simple configuration. It is possible to liquefy reliably while suppressing scattering.

Further, in the present embodiment, the inner diameter D ₁ of the cover member 5 is larger than the outer diameter D ₀ of the shaping air discharge unit 10, and the outside of the main body portion 17 for rotatably mounting the bell cup 11 in the spray gun 3 smaller than the diameter _{D 2.}

  According to such a configuration, the space S1 between the inner surface of the cover member 5 and the shaping air discharge part 10 can be made relatively narrow, and the negative pressure in the space S1 can be generated more effectively. Therefore, the atomized waste liquid reliably forms a spray pattern E having a larger spray width by the generated negative pressure and collides with the side wall 14. Thereby, liquefaction of the atomized waste liquid is more reliably promoted.

[Second Embodiment]
Next, with reference to FIG. 3 and FIG. 4, the waste liquid recovery apparatus 100 a according to the second embodiment of the present invention will be described with a focus on differences from the first embodiment described above, and common points will be described. Omitted where appropriate. FIG. 3 is a schematic longitudinal sectional view showing a state in which the distal end portion of the coating gun 3 is inserted into the waste liquid recovery apparatus 100a according to the second embodiment of the present invention. 4 is a cross-sectional view taken along line BB in FIG.

  As shown in FIG. 3, in the second embodiment, the waste liquid recovery apparatus 100 a further includes a cylindrical filter member 6 provided in the box body 1 and having a horizontal sectional area that decreases downward. Here, the filter member 6 is a cylindrical filter member whose outer shape has an inverted truncated cone shape and whose diameter is reduced in a tapered shape downward. The periphery of the upper end portion of the filter member 6 is in contact with the side wall 14 that forms the inner surface of the box 1. As the filter member 6, a mesh-like filter member knitted with metal fibers is used, but the filter member 6 is not limited to this, and a filter member formed of, for example, a nonwoven fabric may be used.

  The filter member 6 is not limited to a cylindrical filter member whose outer shape has an inverted truncated cone shape. For example, the filter member 6 is a cylindrical filter member whose outer shape has an inverted quadrangular pyramid shape, or an outer shape having an inverted triangular shape. A cylindrical filter member having a frustum shape may be used.

  As shown in FIGS. 3 and 4, the filter member 6 is fixed to the side wall 14 of the box body 1 by, for example, screw fastening or the like using a plurality of (four in this case) support members 12.

  The upper end of the filter member 6 is positioned above the cup tip edge 11a of the coating gun 3 during cleaning (a direction opposite to the spraying direction), preferably above the lower end of the cover member 5. Therefore, the waste liquid sprayed from the cup tip edge 11 a of the bell cup 11 is reliably guided to the filter member 6.

  On the other hand, the lower end of the filter member 6 is positioned away from the surface of the waste liquid receiving portion 8 provided on the bottom wall 7. Therefore, the shaping air staying in the space S <b> 2 inside the filter member 6 is easily discharged from the lower end opening 6 a formed at the lower end of the filter member 6.

  An exhaust pipe 13 is connected to the upper part of the side wall 14 of the box 1 and below the upper end of the filter member 6. Therefore, the shaping air from the lower end opening 6 a of the filter member 6 and the shaping air that has passed through the filter member 6 are easily discharged to the outside of the box body 1 through the exhaust pipe 13.

  In the waste liquid recovery apparatus 100a according to the second embodiment configured as described above, the tip end portion of the coating gun 3 is inserted into the insertion hole 4 of the box 1 and is included in the cover member 5 during cleaning. When the shaping air is discharged from the shaping air discharge portion 10, a negative pressure is generated in the space S <b> 1 between the inner surface of the cover member 5 and the shaping air discharge portion 10. With this negative pressure, the direction of the shaping air is expanded radially outward as indicated by D in FIG.

  For this reason, the atomized (atomized) waste liquid is sprayed from the cup tip edge 11a of the bell cup 11 in a spray pattern E in which the spray width becomes larger by the shaping air. Therefore, the atomized waste liquid is struck strongly against the inner surface of the filter member 6 in a direction closer to the vertical and closer to the coating gun 3 and flows down. Thereby, liquefaction of the atomized waste liquid is promoted.

  The paint of the liquefied waste liquid is generally collected by the filter member 6, while the cleaning liquid such as thinner used for cleaning of the liquefied waste liquid is received by the waste liquid receiving portion 8, and then the waste liquid delivery pipe. It is sent to outside through 9 and collected. Accordingly, it is possible to simplify or eliminate the work of separating the waste liquid into the paint and the thinner on the downstream side of the waste liquid delivery pipe 9. The filter member 6 that collects a certain amount of paint is washed and reused, or discarded and replaced with a new one.

  At this time, a part of the waste liquid that has been struck and liquefied against the inner surface of the filter member 6 scatters due to the impact, but since the scattering direction is directed downward, it is suppressed from adhering to the surface of the coating gun 3. The Even if some waste liquid remains in the flow of the shaping air after the collision with the filter member 6, the shaping air flow is directed downward, so that the waste liquid is applied to the coating gun 3 along with the shaping air flow. Adhering to the surface of the film is suppressed. As a result, for example, waste liquid adheres to the inner surface 11b of the bell cup 11 of the coating gun 3 and is prevented from dropping during the next coating and adhering to the workpiece, thereby impairing the coating quality. Further, the rebound of the shaping air is attenuated by the filter member 6 in the event of a collision. Further, even if the atomized waste liquid is scattered upward in the event of a collision with the filter member 6, for example, in the direction indicated by F in FIG. 3, the tip of the coating gun 3 is surrounded by the cover member 5. Since it is covered, it is suppressed that it adheres to the surface of the coating gun 3 or scatters outward from the box 1.

  According to the second embodiment, in addition to being able to achieve the same operational effects as the first embodiment described above, since the paint of the liquefied waste liquid is collected by the filter member, the downstream It is possible to simplify or eliminate the waste liquid separation work on the side.

[Third Embodiment]
Next, with reference to FIG. 5 and FIG. 6, the waste liquid recovery apparatus 100 b according to the third embodiment of the present invention will be described with a focus on differences from the second embodiment described above, and common points will be described. Omitted as appropriate. FIG. 5 is a schematic vertical cross-sectional view showing a state where the tip of the coating gun 3 is inserted into the waste liquid recovery apparatus 100b according to the third embodiment of the present invention. 6 is a cross-sectional view taken along the line CC of FIG.

  As shown in FIGS. 5 and 6, in the third embodiment, the filter member 6 includes a bottom portion 15 provided continuously with the lower end portion of the filter member 6 and having an opening 16 in the center. Although it is different from the second embodiment, the rest is the same. The shaping air staying in the space S <b> 2 inside the filter member 6 is easily discharged from the opening 16 formed in the bottom portion 15.

  According to the third embodiment, in addition to having the same effects as those of the second embodiment described above, more of the paint in the liquefied waste liquid is collected by the filter member 6. . For this reason, it becomes possible to simplify or eliminate the waste liquid separation operation on the downstream side.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to the structure described in the said embodiment, It includes including combining or selecting suitably the structure described in the said embodiment. The configuration can be changed as appropriate without departing from the spirit of the invention. Further, a part of the configuration of the above-described embodiment can be added, deleted, or replaced.

  For example, in the above-described embodiment, the waste liquid receiving portion 8 is provided on the bottom wall 7, but is not limited to this, and the bottom wall 7 has a substantially dish shape, and the waste liquid receiving portion 8. It may be configured to serve as both.

  In the above-described embodiment, the cover member 5 is formed so as to extend from the upper wall 2 to the inside of the box 1, but is not limited to this, and a part or all of the cover member 5 is formed. It may be formed so as to extend from the upper wall 2 to the outside of the box 1.

DESCRIPTION OF SYMBOLS 1 Box body 2 Upper wall 3 Painting gun 4 Insertion hole 5 Cover member 6 Filter member 7 Bottom wall 8 Waste liquid receiving part 9 Waste liquid delivery pipe 10 Shaping air discharge part 11 Bell cup (bell type spray head)
11a Cup tip edge 14 Side wall 15 Bottom 16 Opening 17 Body trunk 100, 100a, 100b Waste liquid recovery device D ₀ Outer diameter of shaping air discharge part D ₁ Inner diameter of cover member D ₂ Outer diameter of body trunk

Claims (5)

A waste liquid recovery device for recovering waste liquid during cleaning of a paint gun having a bell-type spray head,
A box having an insertion hole for inserting the tip of the coating gun formed on the upper surface;
A waste liquid receiving portion that is provided in a lower portion of the box and receives the waste liquid;
A waste liquid delivery pipe connected to the waste liquid receiving part for delivering the waste liquid in the waste liquid receiving part;
A cylindrical cover member that is connected to the periphery of the insertion hole of the box body and encloses a shaping air discharge part provided in the coating gun during cleaning,
A waste liquid recovery apparatus comprising: The inner diameter of the cover member is larger than the outer diameter of the shaping air discharge part, and smaller than the outer diameter of a main body part of the coating gun on which the spray head is rotatably mounted. The waste liquid recovery device described in 1. A cylindrical filter member provided in the box and having a horizontal cross-sectional area that decreases downward;
The waste liquid recovery apparatus according to claim 1 or 2, wherein a peripheral edge of an upper end portion of the filter member is in contact with an inner surface of the box. 4. The waste liquid recovery apparatus according to claim 3, wherein the filter member includes a bottom portion that is connected to a lower end portion of the filter member and has an opening formed at a center thereof. A waste liquid recovery method for recovering waste liquid during cleaning of a paint gun having a bell-shaped spray head,
Shaping provided at the coating gun inside the cylindrical cover member connected to the peripheral edge of the insertion hole of the box while inserting the tip of the coating gun into the insertion hole formed on the upper surface of the box An arrangement step of arranging an air discharge part;
While supplying the cleaning liquid to the coating gun while rotating the spray head, spraying the shaping air from the shaping air discharge unit, spraying the waste liquid,
A recovery step of recovering the waste liquid received in a waste liquid receiving portion provided at a lower portion of the box,
In the spraying step, the waste liquid recovery method is characterized in that the direction of the shaping air is expanded radially outward by a negative pressure generated in a space between the inner surface of the cover member and the shaping air discharge part.

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