JP4606801B2 - Powder coating equipment - Google Patents

Description

  The present invention relates to a powder coating apparatus including a powder coating booth and a powder recovery device that sucks and collects overspray powder in the powder coating booth.

In powder coating equipment, overspray powder that has not adhered to an object to be coated is generally collected, selected, and reused.
In such a powder coating facility, a cyclone type powder recovery device is generally used, and Patent Document 1 also discloses a cyclone type powder recovery device.

JP-A-8-52399

  As shown in FIG. 6, the cyclone type powder recovery apparatus includes a cyclone cylinder 1 composed of a cylindrical part 1 a and an inverted conical cone part 1 b, and a cylindrical part using swirling air to be treated mixed with the recovered powder. Inverted at the introduction pipe 2 introduced along the inner peripheral wall of the cylinder, the collection powder take-out port 3 provided at the lower end of the cone part, and the lower part of the cone part 1b, and ascending while turning the center part of the cyclone cylinder 1 And a fluid outlet pipe 4 provided at the upper center of the cylindrical portion for discharging the upward swirling flow of clean air from which the recovered powder is separated.

  When the air to be treated mixed with the recovered powder is introduced as a swirl flow along the inner peripheral wall of the cylindrical portion 1a, the powder coating in the air to be treated is subjected to centrifugal force by the swirl flow and separated from the air flow. It reaches the peripheral wall and is collected in the lower part of the cone part 1b, and is collected in the lower collection tank 5 through the double pinch valves 3a and 3b provided in the take-out port 3. Then, the clean air from which the recovered powder has separated is reversed at the cone portion 1 b, rises while turning around the center portion of the cyclone cylinder 1, and flows away from the fluid outlet pipe 4.

  By the way, in order to remove wastes such as lint and metal powder contained in overspray powder and to carefully select the recovered powder, there is one in which a sieve screen 6 is installed on the inner surface of the cone portion 1b. The sieve screen 6 is provided in the cone portion 1 b in a pull-out manner and is vibrated by the vibration vibrator 7.

  Since the air to be treated containing overspray powder goes from the upper side to the lower side while swirling along the inner peripheral wall of the cyclone cylinder 1, the powder coating is carefully selected and the dust is removed at the peripheral part of the sieve screen 6. An upward swirling flow of clean air passes through the central portion of the net 6 from below to above.

  For this reason, when the mesh of the sieve mesh 6 is reduced, the passage resistance of the rising swirl flow of the clean air passing through the central portion of the sieve mesh 6 is increased even if the overspray powder can be sufficiently selected. Therefore, there is a problem that the separation efficiency of the recovered powder coating material is lowered.

  Further, when the sieve mesh 6 is clogged or when a large amount of powder paint is accumulated in the sieve mesh 6, the time for the powder paint to pass through the sieve mesh 6 becomes long, and the vibrating sieve mesh 6 causes the sieve mesh 6 to vibrate. There was also a problem that the dust and powder coating material moved to the central portion of the sieve screen 6 and caught in the upward swirling flow of clean air, and the powder coating separation efficiency was lowered.

  In addition, when the sieve mesh 6 is clogged or when the color of the powder coating is changed, the sieve mesh 6 in the cyclone cylinder 1 must be cleaned. For cleaning or replacement of the sieve mesh in the cyclone, Has the problem that it takes time.

  Furthermore, during the cleaning operation, it is necessary to stop the operation of sucking and collecting the overspray powder. During the painting operation, the sieve screen 6 in the cyclone cannot be cleaned.

  Therefore, the present invention is intended to provide a powder coating apparatus that can easily clean and replace the sieve mesh and can clean the sieve mesh without stopping the painting operation.

  In order to solve the above-described problems, the present invention provides a powder coating booth and a powder coating booth, and a powder coating booth including a powder recovery device that sucks and collects overspray powder in the powder coating booth. In the passage path of the overspray powder with the powder recovery device, a sieve screen for removing foreign matters mixed in the overspray powder is installed.

  According to the present invention, since the foreign matter mixed in the overspray powder is removed by the sieve mesh installed between the powder coating booth and the powder recovery device, the yarn is placed in the powder recovery device such as a cyclone. Foreign matter such as scrap or metal powder does not enter, and the occurrence of sparks due to contact of foreign matter on the inner surface of the cyclone can be prevented.

  In addition, when the passage route is formed by a duct, the sieve screen can be easily cleaned and dust can be removed by removing the duct, so the cleaning operation is much easier than when the sieve screen is installed in a powder recovery device such as a cyclone. The installation cost can be reduced because the sieving screen is easy to install.

  In order to prevent clogging of the sieve mesh and enhance the effect of removing foreign matter, it is preferable to provide a vibration device on the sieve mesh.

  Further, when the sieve screen is formed in a cylindrical shape or a box shape, it can be easily installed inside the duct, can be easily removed, and a large air flow passage area can be secured.

  Furthermore, if the overspray powder contained in the foreign matter is passed through the inside of the cylindrical or box-shaped sieve mesh, the foreign matter tends to accumulate on the tip side in the airflow direction. Therefore, it is preferable to install a dust storage chamber at the tip of the cylindrical or box-shaped sieve screen.

  Further, by providing the duct with a portion where the tip end side in the airflow direction descends and installing a sieve mesh on the descending duct portion, dust easily collects in the dust storage chamber at the tip along the airflow.

  Next, when a rising portion is provided in the duct, and a sieve mesh is installed at the rising portion, and the overspray powder containing foreign matter is passed from below the rising portion of the duct, the foreign matter removed by the sieve mesh is naturally Easy to fall. For this reason, it is possible to provide a dust storage duct below the duct provided with the sieve mesh, collect foreign matter removed by the sieve mesh in the dust storage duct, and discharge the dust out of the duct at the dust storage duct portion.

  In addition, by providing multiple rows of overspray powder passages between the powder coating booth and the powder recovery device, and installing a sieve mesh in each row, by securing at least one row passage route, It is possible to clean the sieve meshes in other rows and remove dust while the painting operation is performed.

  As described above, according to the present invention, the foreign matter mixed in the overspray powder is removed by the sieve mesh installed between the powder coating booth and the powder recovery device, so that the powder recovery such as cyclone is recovered. It is possible to prevent foreign matter from entering the apparatus. When the sieve screen is installed between the powder coating booth and the powder collection device, cleaning and replacement of the sieve screen can be performed more easily than when the screen is installed in the powder collection device.

  In addition, by providing multiple rows of overspray powder passages and installing a sieve screen in each row, ensuring at least one row passage route allows other rows to be applied without stopping the painting operation. It is possible to clean the screen and remove dust.

  FIG. 1 shows an overall view of a powder coating apparatus according to the present invention. A powder coating booth 10 and a cyclone type powder recovery apparatus 11 for sucking and collecting overspray powder in the powder coating booth 10 are shown. Is provided.

  As shown in FIG. 2, a discharge port 12 for discharging the overspray powder A to the outside of the powder coating booth 10 is provided at the lower part of the powder coating booth 10. A duct 13 for supplying overspray powder A is connected to the powder recovery device 11.

  A mounting flange 14 is formed at the end of the duct 13 on the powder coating booth 10 side, and the mounting flange 14 is fixed to the side wall of the powder coating booth 10 with bolts 15.

  A connecting tube 17 of a sieve screen 16 is provided on the outer surface of the discharge port 12 of the powder coating booth 10 so as to surround the discharge port 12, and the cylindrical screen mesh 16 is covered on the connecting tube 17. The sieve screen 16 is detachably fixed to the connection tube 17 by a fixing belt 18. The size of the mesh of the sieve mesh 16 is formed so as to remove dust B mixed in the overspray powder A.

  A cap-shaped dust storage chamber 19 is detachably fixed to the sieve screen 16 by a fixing belt 20 at the tip of the cylindrical sieve mesh 16. A vibration device 21 is attached to the outer surface of the dust storage chamber 19.

  When the suction of the cyclone type powder recovery device 11 is started, an air flow containing overspray powder A and dust B passes through the inside of the cylindrical screen 16 from the discharge port 12 on the side wall of the powder coating booth 10, The dust B is removed by the sieve mesh 16, and the air stream containing the overspray powder A passes through the sieve mesh 16 and is introduced into the cyclone type powder recovery apparatus 11 through the duct 13.

  The cyclone-type powder recovery apparatus 11 includes a cyclone cylinder composed of a cylindrical part 11a and an inverted conical cone part 11b, and air to be treated mixed with overspray powder A as a swirl flow along the inner peripheral wall of the cylindrical part. The introduction pipe 22 to be introduced, the recovered powder take-out port 23 provided at the lower end of the cone portion 11b, and the lower portion of the cone portion 11b are reversed to separate the collected powder rising while turning the center portion of the cyclone cylinder. And a fluid outlet pipe 24 provided at the upper center of the cylindrical portion for discharging the upward swirling flow of the clean air.

  When the air to be treated containing overspray powder A is introduced as a swirl flow along the inner peripheral wall of the cylindrical portion 11a from the introduction pipe 22 through the duct 13, the overspray powder A in the air to be treated is swirled. The centrifugal force is applied, the air is separated from the air current, reaches the peripheral wall, is collected at the lower part of the cone part 11b, and is collected in the lower collection tank 25 through the double pinch valves 23a, 23b provided at the take-out port 14. The Then, the clean air from which the recovered powder has been separated is reversed at the cone portion 11 b, rises while turning around the center of the cyclone cylinder, and flows away from the fluid outlet pipe 24.

  As shown in FIG. 2, the dust B mixed in the overspray powder A is removed by the sieve mesh 16 and collected in the dust storage chamber 19 at the tip end due to the flow of airflow. Since the dust storage chamber 19 can be easily removed by removing the fixing belt 20, it can be easily cleaned.

  Next, FIG. 3 shows that a duct 13 connected to a discharge port 12 for discharging the overspray powder A to the outside of the powder coating booth 10 is provided obliquely downward toward the airflow direction, and inclined obliquely downward. The example which installed the cylindrical sieve net | network 16 in the duct 13 part to perform is shown. The structure, installation method, and the like of the sieve mesh 16 are the same as in the example of FIG. When the sieve screen 16 is installed obliquely in this way, the dust B easily collects in the dust storage chamber 19 at the tip along the sieve screen 16. In this example, a spacer 26 is installed between the connection cylinder 17 and the wall surface of the powder coating booth 10 so that the upper part is thick and the lower part is thin, and the duct 13 is attached obliquely.

  Next, FIG. 4 shows that the rising portion of the duct 13 can be separated vertically, and a sieve mesh mounting plate 28 having an airflow passage hole 27 is sandwiched between the separated duct 13 portions. The example which installed the cylindrical sieve screen 16 is shown. A dust storage duct 29 is attached below the bent portion of the duct 13 that forms the rising portion of the duct 13, and a dust storage box 30 is provided in the dust storage duct 29 so as to be freely put in and out. In the case of this example, when the overspray powder A containing the foreign matter B is passed from below the rising portion of the duct 13, the foreign matter B is collected by the sieve mesh 16. The garbage B collected by the sieve mesh 16 is collected in the garbage storage box 30 in the lower dust storage duct 29 by natural fall. Since the dust storage box 30 is provided so as to be freely inserted into and removed from the dust storage duct 29, the dust B can be easily discharged out of the duct 13 by pulling out the dust storage box 30.

  Next, FIG. 5 shows that a plurality of exhaust ports 12 of the powder coating booth 10 are formed and a plurality of rows of passage paths 31a and 31b for the overspray powder A between the powder coating booth 10 and the powder recovery device 11 are provided. In this example, a screen 16 is provided in each row, and a shutter 32 is provided in each row, and by opening and closing the shutter 32, the flow of airflow can be switched independently for each row. In this way, when it is necessary to clean the sieve mesh 16 installed in one row, the flow of airflow in the row where the sieve mesh 16 that needs cleaning is closed by the shutter 32, and the other If the flow of the airflow in the row is ensured, the screen 16 can be cleaned and the dust can be removed without stopping the painting operation.

  In the case of frequently changing colors, as shown in the example of FIG. 5, if a plurality of passage paths 31a and 31b are installed and a color of one powder paint is assigned to each row, the color changing operation is performed. Is very easy to do. For example, when four color powder coatings are used, four rows of passage paths may be provided.

1 is an overall view of a first embodiment of the present invention. It is principal part sectional drawing of 1st embodiment of this invention. It is principal part sectional drawing of 2nd embodiment of this invention. It is principal part sectional drawing of 3rd embodiment of this invention. It is principal part sectional drawing of 4th embodiment of this invention. It is a general view of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Powder coating booth 11 Powder collection | recovery apparatus 11a Cylindrical part 11b Cone part 12 of reverse cone shape Exhaust port 13 Duct 14 Mounting flange 15 Bolt 16 Sieve net 17 Connection cylinder 18, 20 Fixed belt 19 Garbage storage chamber 21 Vibrator 22 Introduction Pipe 23 Outlet 23a, 23b Pinch valve 24 Fluid outlet pipe 26 Spacer 27 Airflow passage hole 28 Sieve net mounting plate 29 Garbage storage duct 30 Garbage storage box 31a, 31b Passage path 32 Shutter A Overspray powder B Garbage

Claims (4)

Passage of overspray powder between the powder coating booth and the powder recovery device in a powder coating device including a powder coating booth and a powder recovery device for sucking and collecting the overspray powder in the powder coating booth The path is formed by a duct, the rising part is provided in the duct, a sieve net is installed on the rising part to remove foreign matters mixed in the overspray powder, and a dust storage duct is provided below the rising part. Characteristic powder coating equipment. The sieve screen, powder coating apparatus of claim 1 Symbol placement vibrate by the vibration device. The powder coating apparatus according to claim 1 or 2 , wherein the sieve screen has a cylindrical shape or a box shape. 4. The powder coating apparatus according to claim 3 , wherein a dust storage chamber is provided at the tip of a cylindrical or box-shaped sieve screen.

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