JP7479634B2 - Cleaning device and cleaning unit - Google Patents

Description

The present invention relates to a cleaning device and a cleaning unit.

Patent Document 1 discloses a coating device. This coating device sucks up powder paint from a powder paint tank, air-transports it via a transport hose to an electrostatic coating gun, and sprays it from the electrostatic coating gun.

JP 2018-47432 A

In the above coating device, a so-called color change is performed by replacing the powder paint in the powder paint tank with powder paint of a different color. However, when changing the color, it is necessary to clean the inside of the powder paint tank to remove the powder paint before the color change so that the powder paint after the color change does not mix with the powder paint before the color change. This causes a problem in that cleaning is time-consuming.

The present invention aims to provide technology that reduces the effort required to clean inside a paint tank.

The cleaning device of the first invention comprises:
An air blowing mechanism for blowing air into the paint tank;
The paint tank is provided with a driving mechanism that moves the air blowing mechanism between a cleaning position where air is blown inside the paint tank and a standby position different from the cleaning position.

The cleaning unit of the second invention comprises:
A cleaning device according to a first aspect of the present invention;
The paint tank.

According to the present invention, the inside of the paint tank can be cleaned by moving the air blow mechanism to the cleaning position and blowing air into the paint tank. This reduces the effort required to clean the inside of the paint tank.

FIG. 2 is a front cross-sectional view of the cleaning device according to the first embodiment. FIG. FIG. 4 is a partially enlarged view of the periphery of the outer peripheral nozzle in the cleaning device. FIG. 4 is a block diagram illustrating an electrical configuration of the cleaning unit. FIG. 2 is a front view of the paint tank and the suction pipe during painting. 4 is a front view of the paint tank and suction pipe after painting is completed. FIG. FIG. 4 is a front view of the cleaning unit with the cleaning device disposed at the standby position. 11 is a front view of the cleaning unit when the cleaning device has reached a cleaning start position. FIG. FIG. 4 is a front view of the cleaning unit with the cleaning device disposed at the lower end position.

(1) In the first aspect of the present invention, the air blowing mechanism may have a disk-shaped member and an outer peripheral nozzle disposed on the outer periphery of the disk-shaped member.
According to this configuration, the outer peripheral nozzle can inject air at a position close to the inner peripheral surface of the paint tank, so that the powder paint remaining on the inner peripheral surface of the paint tank can be effectively removed.

(2) The opening of the peripheral nozzle may be arranged to face in a direction along a tangent to the outer periphery of the disk-shaped member.
According to this configuration, the air injected from the outer nozzle flows along the inner peripheral surface of the paint tank, so that the powder paint remaining on the inner peripheral surface of the paint tank can be moved along the inner peripheral surface of the paint tank, and as a result, the powder paint can be removed while being prevented from scattering over a wide area.

(3) The disk-shaped member may have a facing surface that faces the bottom surface of the paint tank when in the cleaning position. The outer peripheral nozzle may be disposed on the facing surface.
According to this configuration, the path along which the powder paint removed from the inner circumferential surface of the paint tank is discharged to the outside of the paint tank is restricted by the disk-shaped member, so that the powder paint removed from the inner circumferential surface of the paint tank can be more effectively prevented from scattering to the outside of the paint tank.

(4) In the second aspect of the present invention, the air blow mechanism may have a disk-shaped member and an outer peripheral nozzle disposed on the outer peripheral side of the disk-shaped member. A discharge port may be formed in the bottom surface of the paint tank. An opening of the outer peripheral nozzle of the cleaning device may be disposed at an angle toward the bottom surface of the paint tank.
According to this configuration, an air flow toward the discharge port is generated by the air ejected from the outer peripheral nozzle, so that the powder paint remaining on the inner peripheral surface of the paint tank can be suitably discharged from the discharge port.

(5) In the second aspect of the present invention, the paint tank may have a tank body that is open upward, a discharge port that opens to the bottom surface of the tank body, and a valve that opens and closes a discharge passage that communicates with the discharge port. The air blow mechanism of the cleaning device may have a discharge passage nozzle that blows air into the discharge passage.
With this configuration, after painting is completed, the powder paint in the paint tank can be easily discharged by opening the discharge passage with the valve. Furthermore, the inside of the discharge passage can be cleaned by blowing air into the discharge passage from the discharge passage nozzle.

(6) In the second invention having the discharge passage nozzle, the air ejected by the discharge passage nozzle may be exhausted from the discharge passage.
According to this configuration, the powder paint in the paint tank can be discharged by utilizing the passage in the valve.

Example 1
A first embodiment of the present invention will be described below with reference to FIGS. 1 to 9. FIG.

[Configuration of cleaning device and cleaning unit]
The cleaning device 10 shown in Fig. 1 is a device for cleaning the inside of a paint tank 110 (see Fig. 8), and removes powder paint 111 remaining in the paint tank 110 by blowing air into the paint tank 110 (see Fig. 8). The cleaning device 10 and the paint tank 110 constitute a cleaning unit 1 (see Fig. 8).

The cleaning device 10 is made of, for example, metal, and as shown in FIG. 1, includes an air blow mechanism 30 that blows air into the paint tank 110, and a drive mechanism 70 that drives the air blow mechanism 30. The air blow mechanism 30 includes a disk-shaped member 31, a plurality of (12 in this embodiment) outer periphery nozzles 32 arranged along the outer periphery of the disk-shaped member 31, and a discharge passage nozzle 33 that protrudes downward from the radial center of the disk-shaped member 31.

The disk-shaped member 31 has a disk-shaped upper plate 41, a disk-shaped lower plate 42, and a first spacer 43, a second spacer 44, and a plurality of third spacers 45 (four in this embodiment) sandwiched between the upper plate 41 and the lower plate 42. The upper plate 41, the lower plate 42, the first spacer 43, the second spacer 44, and the third spacer 45 are connected to each other by screws.

The first spacer 43 and the second spacer 44 each have an annular shape and are arranged concentrically with the upper plate 41 and the lower plate 42. The outer diameter of the second spacer 44 is smaller than the inner diameter of the first spacer 43, and the second spacer 44 is arranged radially inward of the first spacer 43. The outer diameter of the first spacer 43 is larger than the outer diameter of the upper plate 41, and the inner diameter of the first spacer 43 is smaller than the outer diameter of the upper plate 41. The first spacer 43 is arranged such that the radially inner part is sandwiched between the upper plate 41 and the lower plate 42, and the radially outer part protrudes radially outward from the outer periphery of the upper plate 41 and the lower plate 42. The third spacer 45 has an annular shape with an axis between the first spacer 43 and the second spacer 44, and is arranged between the first spacer 43 and the second spacer 44.

A plurality of hose connection parts 34 are connected to the upper plate 41. Each of the hose connection parts 34 protrudes upward, and a hose 35 is attached to the tip. The outer peripheral nozzle 32 is connected to the lower side of the radial outer part of the first spacer 43 by screwing. The discharge passage nozzle 33 is connected to the lower side of the radial center part of the lower plate 42 by screwing. An air flow path 50 is formed inside the disc-shaped member 31 to supply air supplied from the hose 35 to each of the outer peripheral nozzles 32 and the discharge passage nozzle 33.

Specifically, as shown in Figs. 1 and 2, a first passage 51 that is connected to the internal space of the hose connection portion 34 is formed between the upper plate 41 and the lower plate 42 and between the first spacer 43 and the second spacer 44. Inside the first spacer 43, a first spacer internal passage 43A is formed that corresponds to each of the outer peripheral nozzles 32 and connects the first passage 51 to the passage 32A inside the outer peripheral nozzle 32. Therefore, the air supplied from the hose 35 is supplied to the outer peripheral nozzle 32 through the first passage 51 and the first spacer internal passage 43A, and is sprayed from the opening 32B of the outer peripheral nozzle 32.

A second passage 52 is formed between the upper plate 41 and the lower plate 42 and on the radial inside of the second spacer 44, and a second spacer inner passage 44A is formed inside the second spacer 44, which connects the first passage 51 and the second passage 52. Furthermore, an air outlet hole 53 is formed in the radial center of the lower plate 42, which connects the second passage 52 with the passage 33A in the discharge passage nozzle 33. Therefore, the air supplied from the hose 35 passes through the first passage 51, the second spacer inner passage 44A, the second passage 52, and the air outlet hole 53, is supplied to the passage 33A in the discharge passage nozzle 33, and is ejected from the opening 33B of the discharge passage nozzle 33.

As shown in Figs. 1 to 3, the outer peripheral nozzle 32 is block-shaped. The outer peripheral nozzles 32 are arranged at equal intervals in the circumferential direction on the outer periphery side of the disc-shaped member 31. The passage 32A inside the outer peripheral nozzle 32 extends linearly in a direction along a tangent to the outer periphery of the disc-shaped member 31 in a plan view, and extends linearly diagonally downward in a side view. Furthermore, the opening 32B of the outer peripheral nozzle 32 faces in a direction along a tangent to the outer periphery of the disc-shaped member 31 in a plan view, and faces diagonally downward in a side view.

As shown in FIG. 1, the discharge passage nozzle 33 has a cylindrical shape extending in the vertical direction. The discharge passage nozzle 33 has a cylindrical base 60 that protrudes downward from the lower surface of the lower plate 42, a first nozzle part 61 provided at the tip of the base 60, a second nozzle part 62 provided at the tip side of the first nozzle part 61, and a fixing device 63 that connects the first nozzle part 61 and the second nozzle part 62. A flange 64 that protrudes radially outward is provided on the outer periphery of the base end side of the base 60, and this flange 64 is connected to the lower plate 42 by screwing, thereby connecting the discharge passage nozzle 33 to the disk-shaped member 31.

The first nozzle section 61 is formed with a straight passage 61A that is connected to the passage 60A in the base 60 and has a circular cross section that extends in the vertical direction. A plurality of straight passages 61A (four in this embodiment) are formed at equal intervals around the circumferential direction of the discharge passage nozzle 33. The diameter of the straight passage 61A is smaller than the diameter of the passage 60A in the base 60.

The second nozzle section 62 has a cover section 65 that covers the tip side of the first nozzle section 61, and a spacer section 66 that forms a gap between the cover section 65 and the first nozzle section 61. The spacer section 66 is disposed radially inward from the straight passage 61A of the first nozzle section 61. Therefore, a cross passage 62A that is connected to the straight passage 61A is formed between the first nozzle section 61 and the second nozzle section 62. The cross passage 62A crosses (more specifically, perpendicular to) the straight passage 61A, spreads radially outward, and is connected to the opening 33B of the discharge passage nozzle 33. In other words, the opening 33B of the discharge passage nozzle 33 is formed around the entire circumference between the outer peripheral surface of the first nozzle section 61 and the outer peripheral surface of the second nozzle section 62, and faces radially outward from the discharge passage nozzle 33.

The drive mechanism 70 is, for example, an air cylinder, and raises and lowers the air blow mechanism 30 to move it between a cleaning position where air is blown inside the paint tank 110 and a standby position different from the cleaning position. The drive mechanism 70 has a cylinder 71 and a piston rod 72. The cylinder 71 is fixed to a side wall 91 via a support member 90. The piston rod 72 moves up and down relative to the cylinder 71. The tip of the piston rod 72 is connected to the disk-shaped member 31 via the drive mechanism connection part 36. Therefore, as the piston rod 72 moves up and down, the air blow mechanism 30 rises and falls.

5, the paint tank 110 has a tank body 120 that contains the powder paint 111, and a valve 130 provided at the bottom of the tank body 120. The tank body 120 has a cylindrical portion 121 that is circular in plan view, a perforated plate 122 that closes the opening on the lower side of the cylindrical portion 121, and a fluidization air supply portion 123 that supplies fluidization air from below the perforated plate 122 to above the perforated plate 122. The tank body 120 defines a storage space that contains the powder paint 111 by the cylindrical portion 121 and the perforated plate 122. The storage space is open upward. The perforated plate 122 has many holes that are smaller than the outer shape of the particles of the powder paint 111. The powder paint 111 contained in the storage space does not pass through the holes in the perforated plate 122 and accumulates on the upper side of the perforated plate 122. The fluidizing air supply section 123 is formed with a fluidizing air inlet 125. The air flowing in from the fluidizing air inlet 125 passes through the holes in the perforated plate 122 and fluidizes the powder paint 111 accumulated on the upper side of the perforated plate 122. This ensures a stable supply of the powder paint 111 to the electrostatic coating gun (not shown).

An exhaust port 126 is formed on the bottom surface of the tank body 120. The bottom surface of the tank body 120 is the upper surface of the perforated plate 122. The exhaust port 126 is connected to a discharge path 140 that discharges the powder paint 111 in the storage space to the outside. The discharge path 140 passes through the perforated plate 122 and the fluidization air supply section 123 of the tank body 120, and passes through the inside of the valve 130.

The valve 130 is, for example, a pinch valve, and more specifically, an air-operated pinch valve that opens and closes a flow path by air pressure. The valve 130 has a valve case 131 and a rubber tube 132 disposed within the valve case 131. At least a portion of the exhaust path 140 is formed within the tube 132. The valve 130 closes the exhaust path 140 when the air within the valve case 131 is pressurized, and opens the exhaust path 140 when the air within the valve case 131 is depressurized.

As shown in FIG. 4, the cleaning device 10 includes a control unit 80. The control unit 80 includes a CPU, a ROM, a RAM, and the like. The control unit 80 controls the supply of air to each device by controlling an electromagnetic valve provided between an air supply source (not shown) and each device, and controls the exhaust of air from each device by controlling an electromagnetic valve provided between an exhaust port (not shown) and each device. The control unit 80 moves the piston rod 72 up and down by supplying air into the cylinder 71 of the drive mechanism 70 or exhausting air from the cylinder 71, thereby moving the air blow mechanism 30 up and down. The control unit 80 supplies air to the air blow mechanism 30 through the hose 35, causing the air blow mechanism 30 to blow air. The control unit 80 supplies air to the fluidization air supply unit 123 of the paint tank 110, and causes the fluidization air supply unit 123 to supply air from below the porous plate 122. The control unit 80 pressurizes or depressurizes the air in the valve case 131 of the valve 130, and opens and closes the exhaust path 140.

[Functions and Effects of the Cleaning Device and Cleaning Unit]
During painting, as shown in FIG. 5, the discharge passage 140 is closed by the valve 130, and the powder paint 111 is stored in the paint tank 110. The powder paint 111 in the paint tank 110 is sucked by the suction pipe 101 of the suction device 100 and supplied to an electrostatic paint gun (not shown). The suction device 100 has a plurality of suction pipes 101 and a suction pipe base connecting plate 102 that connects the plurality of suction pipes 101 to each other, and sucks the powder paint 111 by the plurality of suction pipes 101. When painting is completed, as shown in FIG. 6, the suction device 100 rises and is pulled out from the paint tank 110. Thereafter, the paint tank 110 is automatically moved by a paint tank moving device (not shown), and is disposed directly below the cleaning device 10 as shown in FIG. 7. The discharge passage 140 is opened by the valve 130, and most of the powder paint 111 in the paint tank 110 is discharged from the discharge passage 140. However, the powder paint 111 remains on the inner peripheral surface of the paint tank 110 and on the upper surface of the porous plate 122. The powder paint 111 remaining in the paint tank 110 is removed by the cleaning device 10.

The cleaning device 10 is disposed in the standby position shown in FIG. 7 before starting the cleaning process to clean the inside of the paint tank 110. That is, in this embodiment, the standby position is above (more specifically, directly above) the paint tank 110. The cleaning device 10 starts the cleaning process when a cleaning process start condition is met. The cleaning process start condition is, for example, that a cleaning start operation has been performed by the operation unit 92.

When the cleaning device 10 starts the cleaning process, it drives the drive mechanism 70 to gradually lower the air blow mechanism 30, which is not blowing air, from the standby position. When the air blow mechanism 30 reaches the cleaning start position shown in FIG. 8, the cleaning device 10 causes the air blow mechanism 30 to blow air into the paint tank 110. Specifically, the cleaning device 10 causes air to be ejected from the openings 32B of the outer peripheral nozzles 32 and the openings 33B of the discharge passage nozzle 33. When the cleaning device 10 causes the air blow mechanism 30 to blow air, it may be configured to eject air continuously or intermittently. The cleaning start position is set to a position where the openings 33B of the discharge passage nozzle 33 are disposed in the paint tank 110 and the openings 32B of the outer peripheral nozzle 32 are disposed above the upper end of the paint tank 110, as shown in FIG. 8. In other words, the cleaning device 10 starts air blowing before the outer peripheral nozzle 32 enters the paint tank 110.

When the air blow mechanism 30 reaches the cleaning start position, the cleaning device 10 gradually lowers the air blow mechanism 30 while blowing air. As shown in FIG. 9, the air blow mechanism 30 is sized to fit inside the paint tank 110. Specifically, the outer peripheral nozzle 32 is disposed radially inward from the outer periphery of the disk-shaped member 31, and the outer diameter of the disk-shaped member 31 is smaller than the inner diameter of the paint tank 110 (more specifically, the inner diameter of the cylindrical portion 121). For this reason, the air blow mechanism 30 can enter the inside of the paint tank 110. Therefore, while descending inside the paint tank 110, the air blow mechanism 30 injects air from the opening 32B of the outer peripheral nozzle 32 onto the inner surface of the paint tank 110. As a result, the powder paint 111 remaining on the inner surface of the paint tank 110 is blown to the bottom side of the paint tank 110 and discharged from the discharge path 140.

In particular, the outer peripheral nozzle 32 is disposed on the outer peripheral side of the disk-shaped member 31. Therefore, the air blow mechanism 30 can inject air at a position close to the inner peripheral surface of the paint tank 110 using the outer peripheral nozzle 32. This makes it possible to effectively remove the powder paint 111 remaining on the inner peripheral surface of the paint tank 110.

Furthermore, the opening 32B of the outer peripheral nozzle 32 is arranged facing in a direction along the tangent of the disk-shaped member 31 in a plan view. Therefore, the air sprayed from the outer peripheral nozzle 32 flows along the inner peripheral surface of the paint tank 110. As a result, the powder paint 111 remaining on the inner peripheral surface of the paint tank 110 can be moved along the inner peripheral surface of the paint tank 110, and as a result, the powder paint 111 can be removed while being prevented from scattering over a wide area.

Furthermore, the outer peripheral nozzle 32 is disposed on the underside of the first spacer 43 of the disc-shaped member 31 (i.e., the surface facing the bottom surface of the paint tank 110). Therefore, the path along which the powder paint 111 removed from the inner peripheral surface of the paint tank 110 is discharged to the outside of the paint tank 110 is restricted by the disc-shaped member 31. This makes it possible to more effectively prevent the powder paint 111 removed from the inner peripheral surface of the paint tank 110 from scattering to the outside of the paint tank 110 through the upper opening of the paint tank 110. Note that the bottom surface of the paint tank 110 refers to the bottom surface of the tank body 120 and the upper surface of the porous plate 122.

Furthermore, a discharge port 126 is formed on the bottom surface of the paint tank 110, and the opening 32B of the outer peripheral nozzle 32 of the cleaning device 10 is arranged at an angle toward the bottom surface of the paint tank 110. Therefore, an air flow toward the discharge port 126 is generated by the air sprayed from the outer peripheral nozzle 32. This allows the powder paint 111 remaining on the inner peripheral surface of the paint tank 110 to be suitably discharged from the discharge port 126.

The discharge path nozzle 33 is configured to be sized to fit inside the discharge path 140 in an open state. Specifically, the outer diameter of the discharge path nozzle 33 is smaller than the diameter of the discharge path 140 in an open state. Therefore, the discharge path nozzle 33 can enter the discharge path 140 in an open state. The discharge path nozzle 33 is disposed outside the discharge path 140 when the air blow mechanism 30 reaches the cleaning start position. The discharge path nozzle 33 enters the discharge path 140 as the air blow mechanism 30 descends. The discharge path nozzle 33 then ejects air into the discharge path 140. In this way, the cleaning device 10 can also clean the inside of the discharge path 140 by ejecting air from the discharge path nozzle 33 into the discharge path 140.

Furthermore, the cleaning device 10 exhausts the air ejected from the outer peripheral nozzle 32 and the discharge passage nozzle 33 through the discharge passage 140. Therefore, the cleaning unit 1 can discharge the powder paint 111 in the paint tank 110 by using the passage in the valve 130.

The cleaning device 10 lowers the air blowing mechanism 30 to the bottom end position shown in FIG. 9 while causing the air blowing mechanism 30 to blow air. When the cleaning device 10 reaches the bottom end position, it stops blowing air. That is, in this embodiment, the "cleaning position" is the area from the cleaning start position to the bottom end position. After finishing air blowing, the cleaning device 10 returns the air blowing mechanism 30 to the standby position, and the cleaning process ends.

Other Examples
The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments, for example, are also included within the technical scope of the present invention.

The operation of the air blow mechanism 30 during air blowing is not limited to the configuration of the above-mentioned embodiment 1. For example, the air blow mechanism 30 may blow air while moving up and down reciprocally. In addition, the disk-shaped member 31 may be made rotatable in the circumferential direction, and the air blow mechanism 30 may blow air while rotating the disk-shaped member 31.

The movement direction of the air blow mechanism 30 is not limited to the vertical direction. For example, the air blow mechanism 30 may be movable in a direction inclined relative to the vertical direction, or may be movable in multiple directions different from each other.

The cleaning start position may be a position where the opening 32B of the outer peripheral nozzle 32 is located inside the paint tank 110.

The opening 32B of the outer peripheral nozzle 32 does not have to be inclined toward the bottom surface of the paint tank 110. For example, the opening 32B of the outer peripheral nozzle 32 may be arranged to face in a direction parallel to the bottom surface of the paint tank 110, or may be arranged to face the bottom surface of the paint tank 110.

The opening 33B of the discharge passage nozzle 33 may be arranged at an incline toward the bottom side of the paint tank 110 with respect to the radially outward direction of the air blow mechanism 30. In other words, the opening 33B of the discharge passage nozzle 33 may be arranged facing diagonally downward. With this configuration, the air blow mechanism 30 can eject air into the discharge passage 140 even when the discharge passage nozzle 33 is arranged outside the discharge passage 140. In this case, the discharge passage nozzle 33 does not need to be configured to be able to enter the discharge passage 140. Specifically, the outer diameter of the discharge passage nozzle 33 may be larger than the diameter of the discharge passage 140, or the discharge passage nozzle 33 may be configured not to move into the discharge passage 140.

The air blow mechanism 30 does not have to have a discharge nozzle 33.

The paint tank 110 may not have an outlet 126, an outlet passage 140, and a valve 130.

In the above embodiment 1, the components are connected by screws, but the components may be connected by other means such as welding.

1... cleaning unit 10... cleaning device 30... air blow mechanism 31... disk-shaped member 32... outer peripheral nozzle 32B... outer peripheral nozzle opening 33... discharge passage nozzle 33B... discharge passage nozzle opening 70... drive mechanism 110... paint tank 111... powder paint 120... tank body 126... discharge port 130... valve 140... discharge passage

Claims (7)

An air blowing mechanism for blowing air into the paint tank;
a drive mechanism for moving the air blow mechanism between a cleaning position for blowing air into the paint tank and a standby position different from the cleaning position ,
The air blow mechanism is
A disk-shaped member;
and a peripheral nozzle disposed on the outer periphery of the disk-shaped member,
The opening of the peripheral nozzle is arranged to face a direction along a tangent to the outer periphery of the disk-shaped member,
A cleaning device in which the outer peripheral nozzle has a passage formed therein that extends linearly in a direction along a tangent to the outer periphery of the disk-shaped member and that is connected to the opening . The disk-shaped member has an opposing surface that faces a bottom surface of the paint tank when in the cleaning position,
The cleaning device of claim 1 , wherein the outer circumferential nozzle is disposed on the facing surface. A cleaning device according to claim 1 or 2 ;
A cleaning unit comprising the paint tank,
A drain outlet is formed on the bottom of the paint tank,
A cleaning unit in which an opening of the outer peripheral nozzle of the cleaning device is inclined toward the bottom surface of the paint tank. A cleaning device according to claim 1 or 2 ;
A cleaning unit comprising the paint tank,
The paint tank has a tank body that is open upward and a discharge port that opens to a bottom surface of the tank body ,
The air blow mechanism of the cleaning device is a cleaning unit having a discharge passage nozzle that blows air into a discharge passage connected to the discharge port . The cleaning unit according to claim 4 , wherein the air ejected by the discharge passage nozzle is exhausted from the discharge passage. A cleaning unit comprising a cleaning device and a paint tank,
The cleaning device includes:
an air blowing mechanism for blowing air into the paint tank;
a drive mechanism for moving the air blow mechanism between a cleaning position for blowing air into the paint tank and a standby position different from the cleaning position,
The paint tank has a tank body that is open upward and a discharge port that opens to a bottom surface of the tank body ,
The air blow mechanism of the cleaning device is a cleaning unit having a discharge passage nozzle that blows air into a discharge passage connected to the discharge port . The cleaning unit according to claim 6 , wherein the discharge passage nozzle is disposed facing radially outward or obliquely downward when inserted into the discharge passage.

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