JP5420307B2 - Powder coating equipment - Google Patents

Description

  The present invention relates to a powder coating apparatus that applies a coating to a workpiece by applying a powder coating to the workpiece.

  As a technique for coating the object to be coated, a so-called powder is used in which the object to be grounded is brought into the painting booth and then charged powder paint is discharged into the painting booth. Paint is mentioned. In this case, after the powder coating material is discharged along with the air for conveyance, the powder coating material is attracted to the coating material by the electrostatic action between the coating material and the powder coating material. Painted on.

  In this type of powder coating, in order to prevent the powder coating from leaking outside the coating booth, for example, an air curtain may be formed by providing an air outlet in the coating booth. That is, in this case, the flow of the powder paint is blocked by the air curtain, so that the powder paint is retained in the painting booth.

  The air curtain is also used to partition the painting booth into a plurality of work booths. In relation to this technique, in Patent Document 1, an air suction port is provided in the vicinity of the air curtain to prevent the powder paint discharged to an arbitrary work booth from entering an adjacent work booth. There has been proposed a partition device that sucks air ejected from an outlet from an air suction port.

JP-A-4-349960

  In powder coating, it is common to collect powder paint that has not been applied to the object to be coated, return it to the painting booth, and then re-discharge it toward the object to be coated. For this reason, it is desired to improve the recovery efficiency of the powder coating as much as possible.

  By the way, in the prior art described in Patent Document 1, the coating booth is partitioned into a plurality of work booths by the partition device as described above, and in this case, the powder coating is formed by the partition device. It is blocked by the air curtain and then sucked into the air suction port together with the air. However, Patent Document 1 does not describe any recovery / re-discharge path of the powder paint after being sucked into the air suction port.

  That is, even with reference to the prior art described in Patent Document 1, it is not easy to obtain knowledge about improving the recovery efficiency of the powder paint.

  The present invention has been made to solve the above-mentioned problems, improves the recovery efficiency of the powder paint with a simple structure, and also leaks the powder paint from the painting booth or enters the painting booth from the outside. It aims at providing the powder coating apparatus which can avoid that dust etc. approach.

In order to achieve the above-described object, the present invention provides a painting booth in which an object to be painted which is transported while being connected to ground is carried in, and an introduction port into which the coating material is introduced and an outlet port from which the painting object is led out are formed. When,
A painting tool installed in the painting booth for discharging the charged powder paint to the object to be coated;
A powder paint recovery mechanism including a suction mechanism for sucking an uncoated powder paint discharged from the coating tool and not applied to the object to be coated;
With
A plurality of duct hose connection portions are formed in the vicinity of the inlet and the outlet, respectively.
The uncoated powder paint is sucked from the duct hose connected to the duct hose connection portion together with the atmosphere inside and outside the coating booth, and collected by the powder paint collection mechanism.

  Thus, in the present invention, the air inside and outside the painting booth is sucked from the vicinity of each of the inlet and outlet. For this reason, the pressure on either the inside or outside of the painting booth is lower than the other of the remaining, and a so-called negative pressure state is established, and the flow from the painting booth to the outside or in the opposite direction flows. Even if it occurs, it becomes possible to collect dust and uncoated powder paint from the duct hose. Therefore, it is possible to avoid both the leakage of powder paint from the inside of the painting booth and the entry of dust into the painting booth from the outside without balancing the pressure inside and outside the painting booth. it can.

  Moreover, the uncoated powder paint sucked together with the atmosphere is collected by the powder paint collection mechanism. Thereafter, after appropriate regeneration processing is performed, the paint tool is re-discharged. Therefore, the collection efficiency and use efficiency of the powder coating material are significantly increased.

  For example, at least four of the plurality of duct hose connection portions may be arranged at portions corresponding to the corner portions of the quadrangle. In this case, the atmosphere in the painting booth is efficiently directed to the duct hose connection portion. That is, a so-called rectifying effect can be easily obtained.

  The plurality of duct hose connection portions may be formed in hoods mounted near the introduction port and the outlet port. In this case, the hood may be configured to include an X-shaped part, and a duct hose connection portion may be formed at each tip of the X-shaped part.

  Further, in the painting booth, a duct hose connection portion different from the duct hose connection portion is formed at the bottom of the end surface different from the end surface provided with the plurality of duct hose connection portions. It is preferable to suck uncoated powder paint from the duct hose connected to the hose connection part. Thus, by sucking the powder paint from a plurality of locations, the amount of the powder paint remaining in the painting booth can be significantly reduced. For this reason, the collection efficiency of the powder coating material is further improved.

  In any case, it is preferable that two or more coating tools are provided, and at least two of them are installed on the side wall of the coating booth so that the discharge ports face each other. In this case, the conveying air discharged together with the powder paint from the discharge port of the other coating tool interferes with the powder paint discharged from one discharge port of the coating tool facing each other. For this reason, for example, the powder coating material that is about to diffuse upward in the coating booth collides with the carrier air that is discharged from the opposing discharge port and attempts to diffuse upward, and as a result, the powder coating material is discharged. At this time, the kinetic energy applied from the carrier air is offset, and the kinetic energy is dispersed and floated around the object to be coated.

  Similarly, the powder coating material to be diffused downward collides with the conveying air which is discharged from the opposed discharge ports and is to diffuse downward. As a result, the powder coating material is also dispersed and suspended around the object to be coated.

  The powder coating material dispersed and suspended in the vicinity of the object to be coated in this way is attracted to the object to be coated by electrostatic action. For this reason, the powder coating is efficiently applied to the object to be coated. That is, the coating efficiency is improved.

  In addition, in this case, since the amount of uncoated powder coating material is reduced, the recovered amount of powder coating material and the amount of reprocessing treatment are reduced. For this reason, the cost required for the reproduction process can be reduced.

  Alternatively, three or more coating tools are provided, and at least two of them are extended in a direction substantially parallel to the traveling direction of the object to be coated in the coating booth so that the discharge ports face each other. The at least one painting tool may be installed on a wall that is bridged by the both side walls and extends in a direction substantially parallel to the traveling direction of the object to be coated.

  In this case, in addition to the above-described flow, a flow from the upper side to the lower side of the painting booth, or a flow in the opposite direction occurs. This is because the powder coating material discharged from the at least one coating tool collides with the powder coating material discharged from the at least two coating tools.

  That is, for example, when a painting tool is installed on the ceiling wall, the powder paint discharged from the coating tools facing each other and spreading upward is delivered from the painting tool installed on the ceiling wall. Flowed downward by air. On the contrary, when the painting tool is installed on the bottom wall, the powder coating material that is discharged from the coating tools facing each other and tries to diffuse downward is conveyed air that is discharged from the painting tool installed on the bottom wall. Is caused to flow upward. Accordingly, the amount of the powder coating toward the object to be coated is further increased while the amount of regeneration processing is further reduced, so that the coating efficiency is improved and the cost required for the regeneration processing is further reduced.

  In the configuration described above, it is preferable that the coating booth is formed of an insulator. Or you may make it provide the protective material which consists of an insulator on the inner wall of a painting booth.

  As described above, the powder coating material is attracted to the object to be coated through electrostatic action. On the other hand, in the coating booth made of an insulator or the protective material made of an insulator, an electrostatic action is prevented from being induced between the powder coating material. Accordingly, it is possible to avoid the powder paint discharged from the painting tool, the uncoated powder paint floating without adhering to the object to be coated, and the like from being drawn to the painting booth. For this reason, while the ratio of the powder coating material adhering to a to-be-coated object rises, the collection efficiency of the uncoated powder coating material improves.

  In addition, in this case, since the powder paint hardly adheres to the painting booth or the protective material, it becomes extremely easy to clean the inside of the painting booth. For this reason, since the cleaning time when changing the paint color is shortened, the cycle time is also shortened.

  Preferable examples of the insulator include foamed polyester. This is because the foamed polyester contains a large amount of air bubbles and exhibits high insulation. That is, in this case, the powder paint can be further prevented from being drawn to the painting booth.

  In any case, it is preferable that the upper wall of the painting booth be bent or curved in a direction approaching each other as the distance from the object is increased. This is because the powder coating material discharged from the coating tool hardly adheres to the wall bent or curved in this way. Therefore, for example, the cleaning time of the coating booth or the protective material when changing the coating color is further shortened, and as a result, the cycle time is further shortened.

  Moreover, it is preferable to form the discharge port which discharges compressed gas toward the inside of a coating booth. Thereby, for example, when changing the coating color, the powder paint adhering to the coating booth or the protective material can be easily removed by discharging the compressed gas from the discharge port. Or, while performing the painting work by discharging the powder paint from the painting tool, the compressed gas is discharged from the discharge port toward the inner wall of the painting booth, and so-called air blow is performed to perform cleaning at the same time. May be.

  According to the present invention, the atmosphere inside and outside the painting booth is sucked from the vicinity of the inlet and outlet, so that the powder paint leaks from the inside of the painting booth, and the inside of the painting booth from the outside. It is possible to avoid mixing dust and the like at the same time. In addition, in this case, there is no particular need to balance the pressure inside and outside the painting booth, and therefore control is easy.

  In addition, an uncoated powder paint sucked together with the atmosphere is collected in a powder paint collection mechanism and can be re-discharged from the painting tool. Therefore, the collection efficiency and use efficiency of the powder coating material are remarkably improved.

1 is an overall schematic perspective view of a powder coating apparatus according to the present embodiment. It is a schematic front longitudinal cross-sectional view of the powder coating apparatus of FIG. It is a schematic front view of the powder coating apparatus of FIG. 2 is an overall schematic side view of a coating gun constituting the powder device of FIG. 1. FIG. It is a schematic front longitudinal cross-sectional view of the powder coating apparatus which concerns on another embodiment. It is a schematic front longitudinal cross-sectional view of the powder coating apparatus which concerns on another embodiment. It is a schematic front longitudinal cross-sectional view of the powder coating apparatus which concerns on another embodiment. It is a schematic front longitudinal cross-sectional view of the powder coating apparatus which concerns on another embodiment.

  Preferred embodiments of the powder coating apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is an overall schematic perspective view of a powder coating apparatus 10 according to the present embodiment. The powder coating apparatus 10 includes a transport mechanism 12 for transporting a workpiece W that is an object to be coated, a coating booth 14 into which the workpiece W is loaded, and coating guns 16a to 16e installed in the coating booth 14. (Painting tool).

  The transport mechanism 12 includes a transport guide rail 20 supported by a substantially inverted T-shaped support member 18 and a work fixing base 22 supported by the transport guide rail 20 so as to be displaceable. Among these, a convex portion 24 is formed to protrude on one side surface of the conveyance guide rail 20, and the convex portion 24 is formed in an engagement groove 28 formed on one side surface of the base member 26 constituting the workpiece fixing base 22. Is engaged.

  A columnar member 30 is connected to the other side surface of the base member 26. Furthermore, a mounting fixture (not shown) is provided at the tip of the cylindrical member 30, and the workpiece W is fixed on the mounting fixture.

  The base member 26 is displaced along the conveyance guide rail 20 under the action of a drive mechanism (not shown). Along with this displacement, the unpainted work W is brought close to the painting booth 14 and brought into the painting booth 14 while being separated from the painting booth 14. In the present embodiment, the base member 26 is constantly displaced, and therefore the workpiece W continuously moves from carrying into the painting booth 14 to carrying out.

  As shown in FIGS. 1 and 2, the painting booth 14 supported by the frame members 32 a to 32 d is raised from the bottom wall 34, the bottom wall 34 in a substantially vertical direction, and with respect to the traveling direction of the workpiece W. Side walls 36, 38 arranged substantially in parallel, a ceiling wall 40 bridged between the side walls 36, 38, and an upstream side wall 42 and a downstream side wall 44 that respectively block the upstream side and the downstream side in the traveling direction of the workpiece W. Have. Of course, the upstream side wall 42 is formed with an introduction port 46 for carrying the workpiece W into the painting booth 14. Similarly, the downstream side wall 44 has a lead-out port for exposing the workpiece W from the painting booth 14. 48 is formed.

  As shown in FIG. 2, a slight clearance is formed between the bottom wall 34 and each of the side walls 36 and 38, and hood portions 50 and 52 are provided so as to close the clearances. From these hood parts 50 and 52, substantially cylindrical duct hose connection parts 54 and 56 are formed so as to protrude slightly upward. Duct hoses (not shown) are connected to the duct hose connection portions 54 and 56, respectively. Of course, each of the duct hoses is bridged over a powder paint recovery mechanism (not shown).

  Further, the bottom wall 34 has horizontal portions 58 and 60 extending in a substantially horizontal direction, and two inclined portions 62 and 64 that are bent from the horizontal portions 58 and 60 and inclined toward the ceiling wall 40. Is formed. The inclined portions 62 and 64 are separated from each other to form a clearance 66, and the cylindrical member 30 is passed through the clearance 66.

  As can be seen from FIG. 1, in this case, the height dimension and the width dimension of the upstream side wall 42 and the downstream side wall 44 are such that the upstream side wall 42 and the downstream side wall 44 protrude from the side walls 36, 38 and the ceiling wall 40. Is set to Further, the bottom end faces of the upstream side wall 42 and the downstream side wall 44 are set flush with the bottom wall 34, and the upstream side wall 42 and the downstream side wall 44 are in contact with the end faces of the inclined portions 62, 64 and the above. Hollow substantially quadrangular prism-shaped hood portions 68 and 70 are formed so as to surround each of the inlet 46 and the outlet 48.

  From the vertices of the hood portions 68 and 70, hollow flange portions 72a to 72d and 74a to 74d are formed to protrude with substantially the same dimensions so as to extend along diagonal lines. That is, the hollow flange portions 72a to 72d and 74a to 74d are provided in the hood portions 68 and 70 so as to form an X shape.

  The hollow hose portions 72a to 72d and 74a to 74d have a substantially cylindrical duct hose connection portion at the leading end portion along the extending direction of the conveyance guide rail 20, in other words, the traveling direction of the workpiece W. 76a to 76d and 78a to 78d are formed. Since the hollow flange portions 72a to 72d and 74a to 74d have an X-shape, when a virtual line passing through each of the duct hose connection portions 76a to 76d or the duct hose connection portions 78a to 78d is drawn, the locus of the virtual lines Form a square or rectangle. That is, the duct hose connecting portions 76a to 76d and 78a to 78d are arranged at portions corresponding to the vertices of the virtual quadrangle.

  A duct hose (not shown) different from the duct hose is connected to each of the duct hose connection portions 76a to 76d and 78a to 78d, and each of these duct hoses also extends over the powder paint recovery mechanism. It is bridged.

  The insides of the hollow flange portions 72a to 72d and 74a to 74d communicate with the inside of the hood portions 68 and 70, respectively. That is, the powder paint derived through the hood portions 68 and 70 passes through the hollow flange portions 72a to 72d and 74a to 74d and the duct hose connection portions 76a to 76d and 78a to 78d, and further passes through the duct hose. Then, it is recovered by the powder paint recovery mechanism.

  As shown in FIG. 2, a protective material 79 is joined to the inner wall of the coating booth 14 configured as described above. Although the material of the protective material 79 will not be specifically limited if it is an insulator, For example, the foamed polyester which contains a bubble and has high insulation can be mentioned as a suitable example.

  In this case, two coating guns 16a and 16b are installed on the side wall 36, and coating guns 16c and 16d are installed on the side wall 38 at positions corresponding to the positions of the coating guns 16a and 16b. Furthermore, one painting gun 16e is installed on the ceiling wall 40. The coating guns 16a to 16e have the same configuration, but are given different reference numerals for convenience of explanation.

  Here, an overall schematic side view of the coating gun 16c installed on the side wall 38 is shown in FIG. In this case, the coating gun 16 c includes a gun body 80 and eleven nozzle tubes 82 that branch radially from the gun body 80 and extend. The material of the gun main body 80 and the nozzle tube 82 is selected so as to generate frictional charging with respect to the powder coating that passes while rubbing the inside of the gun main body 80 and the nozzle tube 82. And tetrafluoroethylene.

  The eleven nozzle tubes 82 are converged so as to be aligned in series by a single tube support member 84. Further, the tube support member 84 is in contact with or bonded to the side wall 38, and each end of the nozzle tube 82 protruding from the tube support member 84 is inserted into a communication hole 86 formed in the side wall 38. In this case, the distal end surface of each terminal does not reach the inner wall of the side wall 38 and is located in the middle of the communication hole 86.

  As will be described later, the powder coating material is discharged from the opening formed at the end of the nozzle tube 82 through the communication hole 86. That is, the communication hole 86 functions as a discharge port.

  Of course, the remaining coating guns 16a, 16b, 16d, and 16e are similarly configured. Accordingly, the same reference numerals are assigned to the same components, and detailed description thereof is omitted.

  The terminal ends of the nozzle tubes 82 constituting the coating guns 16a, 16b, 16d, and 16e are also inserted into communication holes 86 provided in the side wall 36 or the ceiling wall 40. Similar to the end of the nozzle tube 82 of the coating gun 16 c, the tip surface of each end does not reach the inner wall of the side wall 36 or the ceiling wall 40, but is located in the middle of the communication hole 86.

  As shown in FIG. 1, the coating guns 16a and 16b and the coating guns 16c and 16d are installed on the side walls 36 and 38 so that the gun bodies 80 and 80 are substantially opposed to each other.

  In the above configuration, the powder paint recovery mechanism has a suction mechanism. Therefore, when the powder paint recovery mechanism is energized, the atmosphere in the painting booth 14 is admitted to the duct hose connection portions 54, 56, 76a. It is sucked through duct hoses connected to each of .about.76d and 78a to 78d.

  The powder coating apparatus 10 according to the present embodiment is basically configured as described above. Next, the operation and effects thereof will be described.

  First, the workpiece W is placed on each of the above-described mounting and fixing bases constituting the workpiece fixing base 22, and then the workpiece W or the workpiece fixing base 22 is electrically connected to the ground. Further, the transport mechanism 12 is energized, and with this energization, the base member 26 and eventually the workpiece W move along the transport guide rail 20 toward the coating booth 14.

  At the same time, the powder paint recovery mechanism is energized, whereby the atmosphere in the coating booth 14 is passed through the duct hoses connected to the duct hose connection portions 54, 56, 76a to 76d, and 78a to 78d. Suction is performed under the action of the suction mechanism. The suction speed in the hood parts 50, 52, 68, and 70 may be, for example, such that the wind speed is 1 to 3 m / second.

  The workpiece W and the columnar member 30 pass through the inlet 46 of the upstream side wall 42 of the coating booth 14 and the clearance 66 between the inclined portions 62 and 64, respectively, and gently move in the coating booth 14 at a predetermined speed. .

  In the coating booth 14, prior to this movement, the powder coating material previously supplied to the coating guns 16a to 16e is discharged along with the conveying air. In addition, the powder coating material is in sliding contact with the gun body 80 and the nozzle tube 82 from the gun body 80 of the coating guns 16a to 16e to the terminal opening of each nozzle tube 82. Charged by friction. That is, the powder coating material is discharged from the communication hole 86 (discharge port) after passing through the opening in a charged state, and sprayed into the coating booth 14.

  As described above, the workpiece W is grounded directly or indirectly through the workpiece fixing base 22. For this reason, the powder coating material discharged in a charged state is attracted to the workpiece W by electrostatic action, and as a result, is applied to the workpiece W.

  On the other hand, a part of the powder paint sprayed in the painting booth 14 diffuses as the conveying air diffuses into the painting booth 14. In an ordinary powder coating apparatus, for example, the kinetic energy generated by the transfer air applied to the powder coating diffused toward the ceiling wall 40 is compared with the kinetic energy that is directed toward the workpiece W by the electrostatic action. For this reason, it is not easy to apply the diffused powder coating.

  However, in the present embodiment, the coating gun 16c is disposed at a position substantially opposite to the coating gun 16a. For this reason, as shown in FIG. 3, the flow of the powder coating material and the conveying air discharged / sprayed from the coating gun 16a collide with the flow of the powder coating material and the conveying air discharged / sprayed from the coating gun 16c. . In other words, the discharge patterns from the coating guns 16a and 16c interfere with each other. Of course, the same applies to the discharge patterns of the coating guns 16b and 16d.

  For this reason, in the coating booth 14, the powder paint diffused toward the ceiling wall 40 and the air for conveyance collide with each other, and as a result, the kinetic energy applied from the carrier air when the powder paint is discharged is reduced. It will be offset. For this reason, the powder coating material is dispersed and suspended around the workpiece W.

  Moreover, in the present embodiment, the paint gun 16e is installed on the ceiling wall 40. The discharge pattern in the coating gun 16e interferes with the powder coating material and the conveying air that are discharged from the coating guns 16a to 16d and try to diffuse upward, and is directed toward the ceiling wall 40 of the powder coating material and the conveying air. The above diffusion is suppressed. Due to this interference, the dispersed and suspended powder coating material flows toward the workpiece W side.

  On the other hand, the powder paint diffused toward the bottom wall 34 and the air for conveyance collide with each other, so that the powder paint is dispersed and floated around the workpiece W.

  Further, the inclined portions 62 and 64 function as a so-called baffle plate with respect to the flow of the powder coating material and the conveying air that diffuses toward the bottom wall 34, thereby generating a flow toward the upper workpiece W side.

  As described above, according to the present embodiment, the communication holes 86 and 86 of the side walls 36 and 38, that is, the discharge ports of the coating guns 16a to 16d are formed at positions substantially opposite to each other. The discharge patterns discharged and sprayed through the holes 86 and 86 interfere with each other, and the painting gun 16e whose discharge patterns interfere with the discharge patterns of the coating guns 16a to 16d is also installed on the ceiling wall 40. I am doing so. For this reason, the kinetic energy of the powder coating material can be lost, and a state in which the powder coating material is easily attracted to the workpiece W side by electrostatic action can be achieved.

  In addition, in the present embodiment, a protective material 79 made of an insulator such as foamed polyester is provided on the inner wall of the painting booth 14. Since the protective material 79 is an insulator, the electrostatic action is prevented from functioning with the powder paint. For this reason, it becomes easier to draw the powder paint toward the workpiece W side.

  That is, in this case, most of the powder paint discharged and sprayed into the coating booth 14 can be moved toward the workpiece W. Therefore, since the coating efficiency with respect to the workpiece W is improved, the amount of uncoated powder paint is reduced as compared with the case where powder coating is performed in a normal coating booth.

  In addition, as described above, since the powder coating material is dispersed and suspended and adheres to the object to be coated through electrostatic action, the thickness of the coating film is reduced over the entire object to be coated regardless of the shape of the object to be coated. It becomes almost constant. That is, it is easy to obtain a coating film having a substantially uniform thickness.

  In addition, for example, in order to make the thickness of the coating film substantially constant when electrostatic coating is performed using a robot or the like holding a coating tool, strict teaching is performed on the robot in order to create a corresponding trajectory. Need to do. However, according to the present embodiment, the thickness of the coating film can be made substantially constant without performing such strict teaching. That is, no complicated work is required, and electrostatic coating on the object to be coated can be easily performed.

  While the powder coating is performed in this manner, the atmosphere in the coating booth 14 is sucked as described above. For this reason, it is prevented that the powder coating material discharged in the painting booth 14 leaks through the hood portions 68 and 70. In addition, the atmosphere to enter the painting booth 14 through the inlet 46 and the outlet 48 is the duct hose connected to the duct hose connecting portions 76a to 76d and 78a to 78d formed in the hood portions 68 and 70. Is sucked through. Therefore, it is avoided that dust etc. mix in the painting booth 14 from the outside.

  Thus, the duct hose connecting portions 76a to 76d and 78a to 78d, in other words, the suction ports are provided in the hood portions 68 and 70, so that the pressure inside and outside the coating booth 14 is not balanced. It is possible to avoid both the leakage of the powder paint from the painting booth 14 and the entry of dust and the like into the painting booth 14 from the outside.

  Moreover, as above-mentioned, duct hose connection part 76a-76d and 78a-78d are located in the site | part corresponding to a square vertex. For this reason, the air inside and outside the coating booth 14 is efficiently sucked into the duct hose connection portions 76a to 76d and 78a to 78d. That is, by providing the duct hose connecting portions 76a to 76d and 78a to 78d at the portions corresponding to the apexes of the quadrangle, a so-called rectifying effect can be obtained.

  Most of the uncoated powder coating material is sucked through another duct hose connected to the duct hose connection portions 54 and 56, and a part of the powder paint is partly connected to the duct hose connection portions 76a to 76d and 78a to 78a to 76a. Suction is performed through the duct hose connected to 78d. The powder paint sucked through the duct hose connection portions 54, 56, 76a to 76d, and 78a to 78d as described above is finally recovered by the powder paint recovery mechanism.

  That is, in the present embodiment, the powder coating material is sucked and collected from both sides of the bottom of the painting booth 14 and from the vicinity of each of the inlet 46 and outlet 48. As described above, by adopting a configuration in which the powder coating material is collected from a plurality of locations in the coating booth 14, the amount of powder coating material remaining in the coating booth 14 is reduced. In other words, the recovery efficiency is improved.

  Of course, the collected powder coating material is subjected to an appropriate regeneration process, and then returned to the discharge mechanism and re-discharged from any of the coating guns 16a to 16e. For this reason, combined with the improvement of the recovery efficiency, the use efficiency of the powder coating material is improved.

  In this case, as described above, since the amount of uncoated powder paint is small, the amount of powder paint to be collected is also small. For this reason, the amount of regeneration processing for reusing the powder coating is reduced, which is advantageous in terms of cost.

  Here, the electrostatic action between the protective material 79 and the uncoated powder paint that has floated without adhering to the workpiece W is prevented from functioning in the same manner as described above. For this reason, it is avoided that uncoated powder paint adheres to the protective material 79, and it is efficiently recovered by the recovery mechanism via the duct hose connection portions 54 and 56 and the duct hose. That is, the recovery rate of the uncoated powder paint is improved.

  Moreover, in the present embodiment, the gun body 80 and the nozzle tube 82 constituting the coating guns 16 a to 16 e are not exposed in the coating booth 14. For this reason, since the powder coating material does not adhere to the coating guns 16a to 16e, the maintenance frequency of the coating guns 16a to 16e is remarkably reduced. Eventually, since the frequency of interrupting the painting operation to perform maintenance on the painting guns 16a to 16e is reduced, the painting operation efficiency for the workpiece W is also improved.

  After the workpiece W is coated in this manner, the coated workpiece W passes through the outlet 48 of the downstream side wall 44 and is exposed from the coating booth 14 as the base member 26 is continuously displaced (unloading). To be).

  When the paint color for the workpiece W is changed, a powder paint corresponding to the paint color may be selected. At this time, in a general painting booth, it is necessary to perform cleaning before discharging the new powder paint in order to avoid the remaining powder paint from being mixed into the new powder paint and causing cloudiness. is there. On the other hand, according to the present embodiment, since the powder coating material is avoided from adhering to the protective material 79 as described above, the protective material 79 and thus the interior of the coating booth 14 is slightly contaminated. is there. Therefore, it is only necessary to perform simple cleaning, and therefore the time required for the cleaning work is also shortened. Along with this, the cycle time is also shortened.

  At this time, only the air is supplied from the coating gun 16e installed on the ceiling wall 40, whereby the powder coating material adhering to the protective material 79 constituting the inner wall of the coating booth 14 can be removed.

  Alternatively, a discharge port penetrating the coating booth 14 and the protective material 79 is formed, and compressed gas such as compressed air or compressed nitrogen is discharged from the discharge port to adhere to the protective material 79 (inner wall of the coating booth 14). Body paint may be removed. In the case where the discharge port is provided, it is possible to perform air blowing on the protective material 79 (the inner wall of the coating booth 14) with the compressed gas discharged from the discharge port at the same time as performing the above-described painting operation.

  In the above-described embodiment, four duct hose connection portions 76a to 76d and 78a to 78d (exhaust ports) are provided in the vicinity of the inlet port 46 and the outlet port 48, respectively. The number is not particularly limited to this. For example, the number may be six or eight. Of course, other numbers may be used.

  The provision of the hood portions 68 and 70 is not essential, and the exhaust ports may be formed directly in the vicinity of the inlet 46 and the outlet 48 in the upstream side wall 42 and the downstream side wall 44.

  Further, a clearance 66 is provided on the bottom wall 34, and instead of supporting the workpiece W on the columnar member 30 passed through the clearance 66, a clearance is provided on the ceiling wall 40 and a suspension passed through the clearance is provided. The coating gun 16e may be provided on the bottom wall 34 while supporting the workpiece W on the member. In this case, when cleaning is performed when the paint color for the workpiece W is changed, suction can be performed from the paint gun 16e.

  In any case, it is not essential to provide the coating gun 16e on the ceiling wall 40 or the bottom wall 34. That is, the powder coating apparatus may be configured by omitting the coating gun 16e. Further, it is not particularly necessary that the gun main bodies 80 of the paint guns 16c and 16d are substantially opposed to the gun main bodies 80 of the paint guns 16a and 16b, respectively.

  Furthermore, instead of the frictional charging described above, the powder coating material may be charged by corona charging.

  Then, instead of providing the protective material 79 on the inner wall of the coating booth 14, the powder coating apparatus 10 may be configured to include a coating booth 90 made of an insulator, as shown in FIG. Even in this case, the same effect as the case where the protective material 79 is provided on the inner wall of the painting booth 14 can be obtained. Of course, a suitable example of the insulator includes foamed polyester and the like.

  The present invention is not limited to the case where the protective material 79 is provided on the inner wall of the painting booth 14 or the case where the painting booth 90 made of an insulator is provided. That is, for example, as shown in FIG. 6, a case where only the coating booth 14 made of a conductor is provided is also included in the present invention.

  Even in this case, as described above, since the coating guns 16c and 16d are disposed substantially opposite to the coating guns 16a and 16b, the kinetic energy of the powder paint is lost, and as a result, The powder paint is in a state of being easily drawn toward the workpiece W by electrostatic action. For this reason, it is possible to sufficiently avoid the powder paint from adhering to the inner wall of the painting booth 14.

  Furthermore, as shown in FIG. 7, the painting booth may be a painting booth 92 in which the upper wall is bent so as to approach each other as it is separated from the workpiece W, which is the object to be coated. As shown, the coating booth 94 may be curved. When it is set as such a shape, it becomes difficult for the powder coating material discharged from the coating guns 16a to 16e to adhere to the wall. Therefore, for example, when the inner walls of the coating booths 92 and 94 when changing the coating color and the protective material 79 are provided, cleaning of the protective material 79 becomes easier. In other words, the cleaning time is further shortened, and as a result, the cycle time is further shortened.

  7 and 8 exemplify the case where the painting booths 92 and 94 are made of conductors, the protective material 79 may be installed on each inner wall as in FIG. Needless to say, the painting booths 92 and 94 may be made of an insulator as in FIG.

DESCRIPTION OF SYMBOLS 10 ... Powder coating apparatus 12 ... Conveyance mechanism 14, 90, 92, 94 ... Coating booth 16a-16e ... Coating gun 34 ... Bottom wall 36, 38 ... Side wall 40 ... Ceiling wall 50, 52, 68, 70 ... Hood part 54 56, 76a to 76d, 78a to 78d ... duct hose connection portion 66 ... clearances 72a to 72d, 74a to 74d ... hollow flange portion 79 ... protective material 80 ... gun body 82 ... nozzle tube 84 ... tube support member 86 ... communication hole W ... Work

Claims (8)

A painting booth in which an object to be coated which is transported by being connected to ground is carried in, an introduction port into which the object to be painted is introduced, and a lead-out port to be led out are formed;
A painting tool installed in the painting booth for discharging the charged powder paint to the object to be coated;
A powder paint recovery mechanism including a suction mechanism for sucking an uncoated powder paint discharged from the coating tool and not applied to the object to be coated;
With
In the vicinity of the inlet and the outlet, a hood including an X-shaped part is attached,
By forming a duct hose connection part at each tip of the X-shaped part, a plurality of duct hose connection parts are formed in the vicinity of the inlet and the outlet,
The powder coating is characterized in that the uncoated powder coating is sucked from the duct hose connected to the duct hose connection portion together with the atmosphere inside and outside the coating booth and collected in the powder coating recovery mechanism apparatus. In powder coating apparatus of claim 1 Symbol placement, the the bottom of the other end face a plurality of duct hose connection end face provided, another duct hose and the duct hose connections in the paint booth A powder further comprising a connection part, wherein the uncoated powder paint is also sucked from a duct hose connected to the other duct hose connection part and collected by the powder paint recovery mechanism Painting equipment. 3. The powder coating apparatus according to claim 1, wherein at least two of the coating tools are provided on a side wall of the coating booth such that the discharge ports face each other. A powder coating apparatus characterized by that. The powder coating apparatus according to any one of claims 1 to 3 , wherein three or more of the coating tools are provided, and at least two of the coating tools are arranged so that their discharge ports face each other. Installed on both side walls extending in a direction substantially parallel to the traveling direction of the object to be coated in the booth, bridged by the both side walls and extending in a direction substantially parallel to the traveling direction of the object to be painted At least one of the coating tools is installed on the wall, and the powder coating material discharged from the at least one coating tool collides with the powder coating material discharged from the at least two coating tools. Powder coating equipment characterized by Powder coating apparatus, characterized in that the powder coating apparatus according to any one of claims 1-4, wherein the coating booth is one that was made of an insulating material. The powder coating apparatus according to any one of claims 1 to 4 , wherein a protective material made of an insulator is provided on an inner wall of the coating booth. The powder coating apparatus according to any one of claims 1 to 6 , wherein an upper wall of the coating booth is bent or curved in a direction approaching each other as it is separated from the object to be coated. Powder coating equipment. The powder coating apparatus according to any one of claims 1 to 7 , wherein a discharge port for discharging compressed gas toward the inside of the coating booth is formed.

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