JP2015077557A - Cleaning apparatus for rotary atomization coating device and cleaning method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning apparatus for a rotary atomization coating device capable of surely removing the coating material adhered to and deposited on an atomizer head.SOLUTION: There is provided a cleaning apparatus 50 for cleaning an atomizer head 11 of a rotary atomization coating device 1 by an atomized cleaning liquid. The cleaning apparatus comprises: a box body 52, on the upper face of which an opening 51 for inserting the top of the device 1 is formed; a filter member 55 which divides the inside of the box body 52 into an upper chamber 53 and a lower chamber 54; a cleaning chamber 56 for cleaning the atomizer head 11 provided in the upper chamber 53 by the cleaning liquid; a cleaning liquid recovery chamber 57 provided in the lower chamber 54 and recovering the cleaning liquid by a cleaning liquid-recovering plate 62; and a reversal member 58 provided to the filter member 55 facing the opening 51 and making a part of the atomized cleaning liquid turn around so as to face the atomizer head 11.

Description

  The present invention relates to a cleaning device for a rotary atomizing coating apparatus and a method for cleaning the atomizing head of the rotary atomizing coating apparatus with a sprayed cleaning liquid.

  When painting using a rotary atomizing coating device, especially for paints that contain a curing agent for resin product painting, paint that occurs during atomization due to frequent adhesion and accumulation of paint on the atomizing head Due to the non-uniformity of the particle size distribution, small bumpy lumps of paint are generated in a convex shape on the surface of the coating film. Periodic cleaning of the atomizing head is required to prevent the occurrence of coating defects called so-called “spits”, and it is also necessary to clean the atomizing head to prevent color mixing when changing paint colors. Has been.

In Patent Document 1 and Patent Document 2, there is a technique for rotating the atomizing head at high speed while supplying thinner from a nozzle whose tip is opened to a paint reservoir formed on the back surface of the hub portion of the atomizing head for cleaning. It is disclosed.

  Patent Document 3 discloses a technique in which a cleaning liquid is supplied into an atomizing head, and a nozzle that injects the cleaning liquid toward the surface of the atomizing head while cleaning the atomizing head from the inside is disclosed.

In Patent Document 4, a cleaning nozzle is disposed so as to approach the front surface of an atomizing head of a rotary atomizing coating apparatus inserted into a waste liquid collection container, and the atomizing head hub is simply ejected from the cleaning nozzle. A technique for cleaning the paint reservoir formed on the back surface of the part, the front surface of the hub part, and the inner surface of the atomizing head is disclosed.

JP-A-8-215611 JP-A-10-156222 Japanese Patent Laid-Open No. 11-114465 Japanese Patent Laid-Open No. 11-216403

However, in the techniques described in Patent Document 1 and Patent Document 2, a part of the thinner reaches the outer peripheral portion of the hub portion back surface by the centrifugal force of the atomizing head and reaches the outer peripheral portion of the hub portion rear surface through the hole in the outer peripheral portion. The remaining thinner is passed through the hole in the center of the hub part to the front side of the hub part, and is transmitted to the front side of the hub part by centrifugal force. In order to clean the front surface of the hub and clean the inner surface of the atomizing head, the thinner only flows in the outer circumferential direction following the shape of the front surface of the hub. It is difficult to reliably remove the accumulated paint.

In the technique described in Patent Document 3, a large amount of cleaning liquid is required, and a problem that the nozzle is clogged with the paint occurs, and the number of maintenance steps for solving this problem increases. Furthermore, the cleaning liquid sprayed from the nozzle adheres to the back of the atomizing head, and if coating is performed as it is, the cleaning liquid will scatter on the workpiece, resulting in poor coating. Necessary.

In the technique described in Patent Document 4, since the inside of the paint reservoir is cleaned using the solvent outflow holes used for cleaning at the time of color change, it takes a long time for cleaning.

  The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a rotary atomizing coating apparatus capable of reliably removing paint deposited and deposited on the atomizing head. It is intended to provide a cleaning apparatus and method therefor.

In order to solve the above-mentioned problem, the invention according to claim 1 is a cleaning device for cleaning the atomizing head of the rotary atomizing coating apparatus with the sprayed cleaning liquid, and an opening for inserting the tip of the rotary atomizing coating apparatus. A box formed on the top surface, a filter member that divides the inside of the box into an upper chamber and a lower chamber, a cleaning chamber that is provided in the upper chamber and that cleans the atomizing head with a cleaning liquid, and the lower chamber And a reversing member for recovering the cleaning waste liquid, and a reversing member for facing the opening and changing the direction of a part of the sprayed cleaning liquid sprayed on the filter member toward the atomizing head.

  Further, the invention according to claim 2 is a cleaning method for cleaning the atomizing head of the rotary atomizing coating apparatus with the sprayed cleaning liquid, wherein the tip of the rotary atomizing coating apparatus is inserted into the opening of the box. And an atomizing head setting step in which the atomizing head is set to face a reversing member provided on a filter member disposed in the box, and the atomizing head set in the atomizing head setting step. Using a cleaning liquid spraying process in which shaping air is discharged while rotating to spray the cleaning liquid toward the filter member and the reversing member, and a negative pressure space formed in front of the front of the atomizing head by the cleaning liquid spraying process. A cleaning step of cleaning the atomizing head by changing the direction of the sprayed cleaning liquid toward the front surface of the atomizing head by the reversing member, and cleaning the atomizing head sprayed in this cleaning step Washed Those with a washing liquid recovery step of recovering.

According to the present invention, the front surface of the hub portion of the atomizing head, the paint discharge hole, and the paint discharge creeping surface are cleaned using the negative pressure in front of the atomizing head generated by the shaping air used in the rotary atomizing coating apparatus. Thus, the deposited paint can be surely removed.

Cross section of the main part of the rotary atomizing coating device Sectional drawing which shows the use condition of the washing | cleaning apparatus of the rotary atomization coating apparatus which concerns on this invention AA line sectional view of FIG. Explanatory drawing showing the state where the paint has adhered and accumulated on the atomizing head Explanatory drawing which shows the spreading | diffusion state by the centrifugal force of the washing | cleaning liquid discharged from the washing | cleaning liquid discharge hole of the atomization head, and the coating material discharge hole

  Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a rotary atomizing coating apparatus 1 to be cleaned by a cleaning apparatus for a rotary atomizing coating apparatus according to the present invention includes a rotary shaft 2 extending from an air motor (not shown), and a rotary shaft 2. An air motor guide cylinder 3 that is rotatably mounted, an intermediate member 4 circumscribing the air motor guide cylinder 3, a second supply path forming member 5 circumscribing the distal end of the intermediate member 4, the distal end of the intermediate member 4, and the air motor guide cylinder 3 A first supply path forming member 6 circumscribing the tip of the first, a second supply path forming member 5, a casing 7 circumscribing the first supply path forming member 6, and a center screwed to the first supply path forming member 6. A ring member 9 having an opening 8 and a bell cup-shaped atomizing head 11 attached to the tip of the rotary shaft 2 through the opening 8 of the ring member 9 via an inner member 10 are configured.

  A pipe member 12 is disposed coaxially with the rotary shaft 2 on the rotary shaft 2, and a paint supply path 13 and a cleaning liquid supply path 14 are formed in the pipe member 12. The paint supply nozzle 15 formed at the tip of the paint supply path 13 opens so that its axis coincides with the axis of the rotary shaft 2, and the cleaning liquid supply nozzle 16 formed at the tip of the cleaning liquid supply path 14 The coating material supply nozzle 15 and the shaft center are made to coincide with each other and open to the outer periphery.

  The paint supply nozzle 15 and the cleaning liquid supply nozzle 16 are open to a paint reservoir 18 formed by the inner member 10 and the hub part 17 of the atomizing head 11. The rear surface 19 of the hub portion 17 is formed with a substantially conical convex portion 20 having the axis of the rotating shaft 2 as a vertex, and the front surface 21 of the hub portion 17 facing the substantially conical convex portion 20 has a concave portion 22. Is formed.

Further, four cleaning liquid discharge holes 23 are inclined inwardly in the axial direction of the rotary shaft 2 and are opened in front of the inclined surface of the substantially conical convex portion 20 toward the concave portion 22 at the same quarter position. In addition, on the circumference of the peripheral edge of the hub portion 17, the paint discharge holes 24 are opened at an evenly twelve locations toward the front in the axial direction of the rotary shaft 2.

A paint discharge creeping surface 25 is formed on the outer periphery of the paint discharge hole 24 on the front surface of the atomizing head 11 and is inclined outward with respect to the axis of the rotary shaft 2 toward the front. An annular space 26 is formed between the casing 7 and the intermediate member 4, and an air trunk path 28 is formed from the annular space 26 toward the air source 27.

The annular space 26 includes a second air supply path 29 formed in the second supply path forming member 5, a first air supply path 30 formed in the first supply path forming member 6, and the first supply path forming member 6. The ring member 9 communicates with an annular air chamber 31 formed by the ring member 9. The ring member 9 is communicated with the air chamber 31 so that the air discharge holes 32 are directed to the circumferential end of the atomizing head 11 at equal 24 locations on the same circumference and directed forward. Inwardly opening.

For example, even if the atomizing head 11 is washed using the technique described in Patent Document 1 or Patent Document 2 after painting, as shown in FIG. 4, the front surface 21 of the hub portion 17 of the atomizing head 11 and Most of the paint remaining on the paint discharge creepage surface 25 is removed, but a part of the paint P still remains in a deposited state. The cleaning device 50 of the rotary atomizing coating apparatus 1 according to the present invention removes all of the paint remaining on the front surface 21 of the hub portion 17 and the paint discharge creeping surface 25 of the atomizing head 11 after painting.

  As shown in FIGS. 2 and 3, the cleaning device 50 of the rotary atomizing coating apparatus 1 according to the present invention has a box body 52 in which an opening 51 for inserting the tip of the rotary atomizing coating apparatus 1 is formed. A filter member 55 that divides the interior of the box 52 into an upper chamber 53 and a lower chamber 54, a cleaning chamber 56 that is provided in the upper chamber 53 and that cleans the atomizing head 11 with a cleaning liquid, and a cleaning liquid that is provided in the lower chamber 54 And a reversing member 58 that is disposed on the filter member 55 so as to face the opening 51 and changes the direction of the sprayed cleaning liquid toward the atomizing head 11.

The box 52 is formed in a cylindrical shape from a circular upper plate 52a, a cylindrical side plate 52b, and a circular lower plate 52c, and an opening 51 is provided at the center of the upper plate 52a. The opening 51 has an inner diameter into which at least the ring member 9 of the rotary atomizing coating apparatus 1 can be inserted.

  The filter member 55 is formed in a circular shape by a mesh filter or a non-woven fabric filter woven with metal fibers, and the inner peripheral surface of the side plate 52b so that the inside of the box 52 is divided into a cleaning chamber 56 and a cleaning liquid recovery chamber 57. It is arranged horizontally in contact with. The filter member 55 facing the cleaning chamber 56 is provided with a circular reversing member 58 whose center is located on an axis passing through the center of the opening 51.

An exhaust hole 60 for exhausting air is provided at the upper end of the side plate 52 b forming the cleaning chamber 56, and an exhaust pipe 61 is connected to the exhaust hole 60. Below the cleaning liquid recovery chamber 57, a cleaning liquid recovery plate 62 for recovering the cleaning liquid is disposed in contact with the inner peripheral surface of the side plate 52b. Further, a recovery hole 63 is provided in the central portion of the cleaning liquid recovery plate 62 facing the opening 51, and a recovery pipe 64 is connected to the recovery hole 63. The recovery pipe 64 is connected to a cleaning liquid tank (not shown).

The operation of the cleaning device 50 of the rotary atomizing coating apparatus 1 according to the present invention configured as described above and the cleaning method thereof will be described. As shown in FIG. 4, the coating P is attached and deposited on the front surface 21 and the coating material discharge creeping surface 25 of the hub portion 17 of the atomizing head 11 to be cleaned by the cleaning device 50.

Therefore, in order to clean the rotary atomizing coating apparatus 1 with the cleaning apparatus 50, the rotary atomizing coating apparatus 1 attached to a robot arm (not shown) is first opened as shown in FIG. To at least the base end of the ring member 9 with the axis of the rotary shaft 2 of the rotary atomizing coating apparatus 1 and the center of the opening 51 of the cleaning device 50 being aligned (atomizing head setting step). .

In this state, the atomizing head 11 of the rotary atomizing coating apparatus 1 is rotated, the cleaning liquid is discharged from the cleaning liquid supply nozzle 16 toward the paint reservoir 18, and the shaping air is injected from the air discharge hole 32. Then, the cleaning liquid discharged from the cleaning liquid supply nozzle 16 spreads in a film shape around the peripheral edge of the hub rear surface 19 along the conical convex portion 20 of the hub rear surface 19 by the centrifugal force of the atomizing head 11.

As shown in FIG. 5, a part of the cleaning liquid is discharged from the cleaning liquid discharge hole 23 to the concave portion 22 of the hub front surface 21, and further the peripheral edge of the front surface 21 of the hub portion 17 by the centrifugal force of the atomizing head 11, and further the paint discharge creeping surface. 25 It spreads in a film shape toward the periphery. A part of the cleaning liquid is discharged from the coating material discharge hole 24 to the periphery of the front surface 21 of the hub portion, and further spreads in a film shape toward the periphery of the coating material discharge surface 25 by the centrifugal force of the atomizing head 11 (cleaning solution spraying step).

While the cleaning liquid discharged from the cleaning liquid discharge hole 23 reaches the paint discharge creepage surface 25, the paint P adhered to and deposited on the hub front surface 21, the periphery of the paint discharge hole 24 and the paint discharge creepage surface 25 is peeled off. Similarly, the cleaning liquid discharged from the coating material discharge hole 24 peels off the coating material P adhering and depositing on the periphery of the coating material discharge hole 24 and the coating material discharge creeping surface 25 while reaching the coating material discharge creeping surface 25 (cleaning process).

However, as shown in FIG. 5, since the diffusion of the cleaning liquid is hindered by the paint P adhering and depositing on the front surface 21 of the hub portion 17 and the paint discharge creeping surface 25 of the atomizing head 11, only the above-described diffusion of the cleaning liquid causes adhesion and deposition. The applied paint P cannot be reliably peeled off.

  Next, as shown in FIG. 2, the cleaning liquid that has reached the periphery of the paint discharge creeping surface 25 is atomized by the centrifugal force of the atomizing head 11, and further flows forward by the shaping air SA from the air discharge hole 32. The shaping air SA <b> 1 containing the atomized cleaning liquid flows down and partly collides with the filter member 55.

  As a result, the shaping air SA1 containing the atomized cleaning liquid is separated into the cleaning liquid WL and the air, and the separated cleaning liquid WL is dropped into the cleaning liquid recovery chamber 57 below and stored in the cleaning liquid recovery plate 62. Furthermore, it is recovered in a cleaning liquid tank (not shown) via a recovery hole 63 and a recovery pipe 64 (cleaning liquid recovery step). Further, the separated air is discharged to the outside through an exhaust pipe 61 from an exhaust hole 60 provided in the cleaning chamber 56. The paint contained in the cleaning liquid WL is collected by the filter member 55.

A part SA2 of the shaping air SA1 collides with the reversing member 58 disposed on the filter member 55, and its flow path is changed. The change of the flow path in the direction away from the axis of the rotating shaft 2 is hindered by the flow of the shaping air SA1 that flows down through the filter member 55 around the reversing member 58, and the direction toward the axis of the rotating shaft 2 The flow path is changed by the suction force of the negative pressure space NP formed in front of the atomizing head 11, and is internally inverted in the direction toward the axis of the rotary shaft 2, and further becomes the upward flow SA 3. Ascend toward the hub portion 17 of the atomizing head 11 and the paint discharge creeping surface 25.

  The shaping air SA3 containing the rising cleaning liquid collides with the hub portion front surface 21 and the paint discharge creeping surface 25 of the atomizing head 11. The paint P deposited on the hub front surface 21, the paint discharge hole 24 periphery and the paint discharge creeping surface 25 that could not be peeled off can be reliably peeled off by the cleaning liquid contained in the collided shaping air SA3 (cleaning step). .

The collided shaping air SA3 moves to the peripheral edge of the paint discharge creepage surface 25 following the hub portion front surface 21 and the paint discharge creepage surface 25 of the atomizing head 11, and again flows forward by the shaping air SA discharged from the air discharge hole 32. . The shaping air SA <b> 1 containing the atomized cleaning liquid flows down and partly collides with the filter member 55.

  As a result, the shaping air SA1 containing the atomized cleaning liquid is separated into the cleaning liquid WL and the air, and the separated cleaning liquid WL is dropped into the lower recovery chamber 57 as a liquid and stored in the cleaning liquid recovery plate 62. It is recovered in a cleaning liquid tank (not shown) via the recovery hole 63 and the recovery pipe 64 (cleaning liquid recovery step). Further, the separated air is discharged to the outside through an exhaust pipe 61 from an exhaust hole 60 provided in the cleaning chamber 56. The paint contained in the cleaning liquid WL is collected by the filter member 55.

In the present embodiment, the diameter of the atomizing head 11 is 50 mm, the rotation speed is 25,000 rpm, and thinner as the cleaning liquid is discharged from the cleaning liquid supply nozzle 16 at 250 cc / min. , 40 mm, 60 mm, 80 mm, 100 mm, 120 mm, and 140 mm, when the reversing member 58 is placed on the filter member 55, the flow rate of the shearing air is changed from 250 to 500 NL / min in increments of 50 NL / min. The peeling state of the paint P adhered and deposited on the hub front surface 21 of the atomizing head 11, the periphery of the paint discharge hole 24, and the paint discharge creeping surface 25 was confirmed. The results are shown in Table 1.

From Table 1, the coating material was peeled well when the diameter of the reversing member 58 was 40 mm to 100 mm and the shaping air flow rate was 450 to 500 NL / min. In particular, when the diameter of the reversing member 58 is 80 mm, the flow rate of the shaping air is 450 to 500 NL / min, and when the diameter is 100 mm, the flow of the shaping air is 500 NL / min. It was. The reversing member 58 may be a cylindrical body.

According to the present invention, the front surface of the hub portion of the atomizing head, the paint discharge hole, and the paint discharge creeping surface are cleaned using the negative pressure in front of the atomizing head generated by the shaping air used in the rotary atomizing coating apparatus. Thus, it is possible to provide a cleaning device and a method for a rotary atomizing coating device that can reliably remove the deposited paint.

DESCRIPTION OF SYMBOLS 1 ... Rotary atomization coating apparatus, 2 ... Rotating shaft, 9 ... Ring member, 11 ... Atomization head, 13 ... Paint supply path, 14 ... Cleaning liquid supply path, 15 ... Paint supply nozzle, 16 ... Cleaning liquid supply nozzle, 17 ... Hub part 21 ... Front face 23 ... Cleaning liquid discharge hole 24 ... Paint discharge hole 25 ... Paint discharge creeping surface 50 ... Cleaning device 51 ... Opening part 52 ... Box body 53 ... Upper chamber 54 ... Lower chamber 55 ... Filter member, 56 ... Cleaning chamber, 57 ... Cleaning liquid recovery chamber, 58 ... Reversing member, 60 ... Exhaust hole, 61 ... Exhaust pipe, 62 ... Cleaning liquid recovery plate, 63 ... Recovery hole, 64 ... Recovery pipe, P ... Paint SA, SA1, SA2, SA3 ... Shaping air, WL ... cleaning liquid.

Claims (2)

A cleaning device for cleaning an atomizing head of a rotary atomizing coating apparatus with a sprayed cleaning liquid, and a box body having an opening formed on an upper surface for inserting a tip portion of the rotary atomizing coating apparatus, and the box body A filter member that divides the interior into an upper chamber and a lower chamber, a cleaning chamber provided in the upper chamber for cleaning the atomizing head with a cleaning liquid, a cleaning liquid recovery chamber provided in the lower chamber for recovering the cleaning liquid, and the opening A cleaning device for a rotary atomizing coating apparatus, comprising a reversing member that changes the direction of a part of the sprayed cleaning liquid that is provided on the filter member so as to face the portion toward the atomizing head. A cleaning method for cleaning an atomizing head of a rotary atomizing coating apparatus with a sprayed cleaning liquid, wherein the tip of the rotary atomizing coating apparatus is inserted into an opening of a box and the atomizing head is inserted into the box An atomizing head setting step for setting the reversing member provided on the filter member disposed in the body so as to face, and a cleaning liquid by discharging shaping air while rotating the atomizing head set in the atomizing head setting step Cleaning liquid spraying step for spraying the filter member and the reversing member, and a part of the cleaning liquid sprayed using the negative pressure space formed in front of the front surface of the atomizing head by the cleaning liquid spraying process is reversed. A cleaning process for cleaning the atomizing head by changing the direction toward the front of the atomizing head by a member, and a cleaning liquid recovery process for recovering the cleaning liquid sprayed in this cleaning process and used for cleaning the atomizing head Method for cleaning a rotary atomization coating apparatus characterized by obtaining.

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