JPS63166460A - Powder painting method and apparatus therefor - Google Patents

Abstract

PURPOSE:To easily form a paint film having a uniform thickness to the entire area of a surface to be painted, by a method wherein powder paint is sprayed to a work while the work is rotated and the spraying condition of the powder paint is kept constant. CONSTITUTION:The powder painting means 52 provided at a painting position is equipped with a hopper 53 receiving powder paint, a recovery tank 54 for recovering the powder paint sprayed to a work 1 under its own wt. from the hopper 53, and a supply means 55 for again supplying the recovered powder paint to the hopper 53 in circulation. Further, the work rotary driving means 56 provided to a support bracket 45 to rotate the work 1 is mounted. The work 1 fed out from a heating oven is positioned in an inclined state under the hopper 53 and is rotated along with a holder 2 by the rotational driving of a motor 64. When the shutter of the hopper 53 is opened in this state, the powder paint is sprayed to the rotating work is by gravity.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a powder coating method and apparatus for applying a powder coating to a heated work by applying it to the workpiece.

"Prior Art" As an example of a powder coating method, the fluidized dipping method is already well known. In this fluidized dipping method, powder coating is stored in a dipping container, compressed air is supplied into the dipping container from below, the powder coating is suspended in the air stream at a required height, and the suspended powder is The powder coating is applied by immersing a workpiece heated to a required temperature in the body paint so that the powder coating adheres to the workpiece.

``Problems to be Solved by the Invention'' However, in the conventional fluidized dipping method described above, since the powder coating is suspended in the air flow, it is difficult to maintain a uniform upper surface of the floating powder coating. When the above-mentioned workpiece is immersed in the required amount of floating powder paint, the paint adhesion boundary surface on the upper surface of the floating powder paint becomes wavy up and down. .

Therefore, if you want to paint only the part below a certain part of the workpiece, mask that part with an appropriate masking jig or the like and then immerse the workpiece in the powder coating. A large amount of powder paint tends to adhere to the boundary areas, and after the masking is removed, flakes are likely to form on the paint in those areas.

In addition, since the workpiece is immersed in the floating powder paint, the immersion time in the powder paint differs between the upper and lower parts of the workpiece, which causes the paint film thickness to change in the direction of the immersion depth. It has the disadvantage of being stored away. Furthermore, it has been impossible to paint only the middle part of the workpiece excluding the upper and lower parts, or to paint the workpiece except for the bottom surface, unless appropriate masking is applied to the lower part or the bottom surface.

[Means for Solving the Problems] In view of such circumstances, the present invention provides a powder coating in which a powder coating is applied to the workpiece after the workpiece is heated to a required temperature. The coating method is characterized in that the powder coating is applied to the workpiece by spraying the powder coating while rotating the workpiece.

The present invention also provides a powder coating apparatus for carrying out such a coating method, including a work rotation means for holding and rotating a work heated to a required temperature, and a work rotation means located above the work for applying powder to the work. A hopper for spraying body paint, a collection tank provided below the hopper for collecting powder paint from the hopper, and a supply means for circulating and supplying the powder paint collected in the collection tank to the hopper. The present invention provides a powder coating device characterized by the following.

``Operation'' As mentioned above, since the powder coating is sprayed onto the workpiece while rotating, the powder coating spraying conditions can be maintained constant, resulting in less paint adhesion compared to conventional methods. It is possible to reduce the waving phenomenon at the interface,
Therefore, it is possible to deposit the paint so that the boundary surface to which the paint adheres is substantially constant.

In addition, even if appropriate masking is required, it is possible to reduce the adhesion of powder paint at the border of the masking compared to the conventional method, and it is easy to form in that area after the masking is removed. The occurrence of deburring can be suppressed, and subsequent deburring work can be omitted or simplified.

Furthermore, since the powder coating is sprayed onto the rotating workpiece, the contact time between the workpiece and the powder coating can be made substantially constant over the entire painted surface, thus ensuring a uniform paint film thickness. can be achieved. For example, if you want to paint only the middle part of a workpiece, excluding the upper and lower parts, as described above, simply support the workpiece horizontally, rotate it, and spray the powder coating only on the middle part of the workpiece. This makes it possible to set the painting range more freely than in the past.

``Embodiment'' The present invention will be described below with reference to the illustrated embodiment. In FIGS. 3 to 5, a holder 2 that holds and suspends a rod-shaped work 1 (see FIG. 7) is composed of two members. 2a,
2b, by fitting the upper cylindrical part of the work 1 into the half-cylindrical part formed at the lower end of each member 2a, 2b and tightening both members 2a, 2b with bolts 3. The work 1 is connected to the holder 2. Further, the holder 2 is formed with two annular grooves 2C12d on the upper and lower sides, and furthermore, a cross-shaped engagement protrusion 2e is formed on the upper end surface.

As shown in FIGS. 1 and 2, the lower annular groove 2d formed in the holder 2 is engaged with an engagement groove 6 formed in a straight line in the machine frame 5 manually or by an appropriate conveyance device; 1st
The workpiece conveying means 7 intermittently conveys the workpiece 1 in a suspended state along its engagement groove 6.

The first workpiece conveyance means 7 includes a cylinder device 8 arranged and fixed above and along the engagement groove 6,
As shown in FIG. 2, a plurality of engagement claws 1O are attached at predetermined intervals to an operating member 9 that is reciprocated along the engagement groove 6 by this cylinder device 8.

Each of the above-mentioned engaging claws 1O is normally directed downward to the above-mentioned holder 2.
2, and can be rotated approximately 90 degrees from the lower position only in the counterclockwise direction in FIG.

Therefore, each engaging claw 10 is
When the is moved to the right, each engaging pawl]O engages with each holder 2 and moves them together to the right, and when each engaging pawl lO is moved to the left by the cylinder device 8, is each engaging claw 10
rotates counterclockwise and moves to the left beyond each holder 2, leaving each holder 2 in its position. As a result, each holder 2 is intermittently conveyed 4 to the right by a predetermined distance by the reciprocating operation of each engaging claw lO by the cylinder device 8.

A primer application means 12 is provided below the engagement groove 6 to match the intermittent stop positions of the holder 2 and apply a primer to the workpiece 1 suspended therefrom.

This primer application means 12 includes a container 13 containing a primer, and a cylinder device 14 for raising and lowering the container 3.
Holder 2 intermittently transported by workpiece transport means 7
When the container 13 is stopped, the container 13 is raised and lowered so that the workpiece 1 can be relatively immersed in the primer in the container 13.

As shown in FIG. 1, the engagement groove 6 formed in the machine frame 5 has its right end bent at a right angle and continues to the engagement groove 16. The cylinder device 17 arranged in the longitudinal direction constitutes the first workpiece conveying means 7 together with the cylinder device 8, and holds the holder 2 which has been intermittently conveyed to the bending portion by the cylinder device 8. It can be moved forward along the matching groove 16.

At the tip of the piston rod, the cylinder device 17 has a
The holder 2 is provided with a first fork 18 that engages with the annular groove 20 above the holder 2 to suspend it.
The loading/unloading means 19 provided in front of the
It is now possible to deliver to.

The loading/unloading means 19 receives the holder 2 from the first fork 18 and transfers it together with the work 1 to the heating furnace 20.
The workpiece 1 carried into the heating furnace 20 and heated by the heating furnace 20 is carried out from the heating furnace 20, and the first fork 18
A second workpiece conveying means 21 located at a position opposite to
The heated workpiece 1 can be delivered to the second fork 22 of. This second fork 22
are moved forward and backward by a cylinder device 23, as will be described in detail later.

As shown in FIGS. 6 and 7, the loading/unloading means 19 is a gripping means for gripping the lower annular groove 2d of the holder 2 supplied while the upper annular groove 2C is held by the first fork 18. 26 and the holder 2 gripped by the gripping means 26 by moving the gripping means 26 back and forth a large amount into the heating furnace 2.
The main cylinder device 27 (FIG. 7) is provided for carrying the holder 2 into the heating furnace 20 and carrying it out from the heating furnace 20.

Further, when the holding means 26 carries out the holder 2 from the heating furnace 20 and the second fork 22 holds the holder 2, the carrying-in/out means 19 slightly retreats the holding means 26 and the second fork 22 holds the holder 2. A sub-cylinder device 28 is provided to allow the holder 2 to be carried out by the two forks 22.

The gripping means 26 is provided on a sub-plate 29, and includes a fixed claw 30 fixed to the sub-plate 29, a gripping claw 31 provided to be able to open and close the fixed claw 30, and an opening/closing mechanism that opens and closes the gripping claw 31. A cylinder device 32 is provided. When the holder 2 is supplied with the upper annular groove 2C held by the first fork 18 while the gripping claws 31 are open, the gripping claws 31 are closed by the opening/closing cylinder device 32. Holder 2
The lower annular groove 2d can be gripped.

Further, the sub-cylinder device 28 is connected to the sub-plate 2.
The sub-cylinder device 28 and the sub-plate 29 are connected to the main plate 33.
The main plate 33 is moved forward and backward by the main cylinder device 27.

Next, as shown in FIGS. 2 and 6, the heating furnace 20 is equipped with a door 37 that is opened and closed by a cylinder device 36, and is intermittently driven to rotate in a horizontal plane by a motor (not shown) inside the door 37. The rotating body 38 is equipped with a rotating body 38. This rotating body 38 is provided with engaging portions 38a at equal intervals on its outer circumference, which engage with the annular groove 2C above the holder 2.
The workpiece 1 can be heated while holding the holder 2 delivered from the gripping means 26 and intermittently conveying it.

An arcuate guide 39 is attached to the outer periphery of the rotating body 38 except at the workpiece transfer position between the carrying in/out means 19 and the gripping means 26, from which the holder 2 held by the engaging part 38a falls off. I try not to have anything to do.

In the above configuration, the carrying in/out means 19 first carries out the already heated holder 2 from the rotating body 38 in the heating furnace 20 and delivers it to the second fork 22 on the downstream side, and then transfers it to the second fork 22 on the upstream side. A new holder 2 is received from the first fork 18 and carried into the rotating body 38 in the heating furnace 20.

That is, the gripping claw 31 is opened and closed by the opening/closing cylinder device 32.
is opened and the sub plate 29 and the gripping means 35 are moved to the forward end position by the sub cylinder device 28. When the door 37 of the heating furnace 20 is opened by the cylinder device 36, the main cylinder device 27 advances the main plate 33 and the gripping claws 31 enter the heating furnace 20.

Then, between the released gripping claw 31 and the fixed claw 30,
When the lower annular groove 2d of the holder 2 held by the engaging portion 38a of the rotating body 38 is relatively inserted, the gripping claws 31 are closed by the opening/closing cylinder device 32 to hold the holder 2, and then The main plate 33 is moved back by the main cylinder device 27, and the holder 2 is separated from the retaining portion 38a and carried out from the heating furnace 20. Thereafter, 537 of the heating furnace 20 is closed by the cylinder device 36.

When the main plate 33 reaches the backward end while the sub-plate 29 is located at the forward end, the second fork 22 on the downstream side is advanced and the annular groove 2c above the holder 2 is moved forward.
engage with. Then, the opening/closing cylinder device 32 releases the grip of the holder 2 by the gripping claws 31, and when the sub-plate 29 is subsequently retracted from the forward end by the sub-cylinder device 28, the second fork 22 becomes in a retractable state.

In this state, the second fork 22 holding the holder 2 is retracted by the cylinder device 23 to completely receive the work 1 heated in the heating furnace 20 from the gripping means 26, and the second fork 22 When the sub-plate 2 is retracted, the gripping claw 31 remains open and the sub-plate 2 is moved back.
9 is moved to the forward end.

When the sub-plate 29 is moved to the forward end with the gripping claw 31 left open, the first fork 18 on the upstream side is moved forward and the holder 2 held by it is inserted between the gripping claw 31 and the fixed claw 30. Then, the gripping claws 31 are closed by the opening/closing cylinder device 32 to grip the holder 2.

Thereafter, when the door 37 of the heating furnace 20 is opened, the main cylinder device 27 is operated to carry the holder 2 gripped by the gripping means 26 into the heating furnace 20,
The holder 2 is supplied to the engaging portion 38a which has become empty after being carried out.

When the gripping claws 31 are released with the holder 2 engaged with the engaging portion 38a, the main plate 33 is retracted to the retracted position, the gripping means 26 is carried out from the heating furnace 20, and then the cylinder device s of the heating furnace 20 again by 36
37 is closed.

In this state, the main plate 33 is located at the rearward end,
Since the sub-plate 29 is located at the forward end and the gripping claws 31 are in the open state, they return to the initial state, and the rotating body 38 is intermittently moved by the distance between the respective engaging portions 38a. The next workpiece 1 that has been rotated and has already been heated
Then, the holder 2 is positioned at the ejection position.

As can be understood from the above explanation of the operation, the loading/unloading means 19 simply takes the holder 2 into and out of the heating furnace 20, so the holder conveying means passes through the heating furnace together with it and is heated. Compared to conventional devices, the thermal efficiency of the heating furnace 20 can be increased, and running costs can be reduced.

However, as shown in FIG. 8, the second fork 22 on the downstream side is mounted on a movable plate 42 so as to be able to swing up and down with a pin 43, and the movable plate 42 is mounted on a support plate 44. It is attached so that it can freely move forward and backward toward the loading/unloading mechanism 19 side.

A support bracket 45 is attached to the support plate 44 so as to straddle the movable plate 42 (FIG. 9), and the cylinder device 23 is attached to the support bracket 45 so as to be interlocked with the movable plate 42.

The second fork 22 is normally located in a horizontal state, and in this state is moved forward and backward by the cylinder device 23 so that it can receive the holder 2 as described above. The second fork 22 is provided with a roller 46 at a position where the holder 2 is held in contact with the upper and lower cylindrical surfaces of the holder 2 to support its rotation.

As shown in FIG. 1, the support plate 44 is slidably attached to two guide rails 47 arranged parallel to the engagement groove 6, and a motor (not shown) is attached to the support plate 44. An interlocked endless chino 48 (Fig. 8) is connected.

The support plate 44 is moved forward and backward along the guide rail 47 by an endless chino 48, and has two locations: a receiving position A where the holder 2 is received from the heating furnace 20, and a workpiece 1.
The workpiece 1 is moved to a coating position B where powder coating is applied to the workpiece 1, and a delivery position C where the coated workpiece 1 is delivered to a conveying means on the downstream side.

A powder coating means 52 is provided at the coating position B, and as shown in FIG. a collection tank 54 for collecting the powder paint sprayed by the hopper 53;
Further, a workpiece rotation drive means 56 is provided on the support bracket 45 and rotates the workpiece 1.

The recovery tank 54 is provided on the machine frame 5 so as to be able to rise and fall freely,
When the work 1 suspended from the second fork 22 is carried above the collection tank 54 and stopped, it is lifted by the lifting cylinder device 57 provided between the machine frame 5 and the collection tank 54, and The workpiece 1 can be accommodated inside.

By the way, as shown in FIG. 8, the second fork 22 is integrally provided with arms 60 on both sides of its lower part, and a cam follower 61 is provided at the tip of each arm 60. The cam follower 61 provided at the tip of each arm 60 is
As shown in FIG. 1θ, it can come into contact with the upper end of a lifting rod 62 that is provided on the machine frame 5 so as to be able to rise and fall freely, and the lower end of this lifting rod 62 can come into contact with a cam member 63 that is attached to the collection tank 54. It is possible to touch it.

When the collection tank 54 is raised by the cylinder device 57, the cam member 63 is moved up by the cam follower 6.
1, and as it rises, the second fork 22 is swung about the bin 43, thereby tilting the work 1 suspended from the second fork 22 as shown by the imaginary line. I'm trying to do that.

Further, a support bracket 45 provided on the support plate 44
includes a cylinder device 2 that moves the second fork 22 forward and backward.
A motor 64 constituting the workpiece rotation driving means 56 is obliquely mounted above the work rotation drive means 3, and a cross-shaped engagement protrusion 2e formed on the upper end surface of the holder 2 is attached to the tip of the rotation shaft of the motor 64. An engagement clutch 65 to be engaged is attached.

Therefore, as described above, the second fork 22 is
3, the engagement protrusion 2e of the holder 2 comes to engage the engagement clutch 65, and by rotating the motor 64 in this state, the holder 2 and the workpiece 1 are rotated. can be rotated while the cylindrical surface of the holder 2 is supported by the roller 46 described above.

On the other hand, the hopper 53 is provided with two upper and lower hopper parts 53a and 53b, as shown in FIGS.
A rotating body 67 is rotatably and tightly fitted into the cylindrical body 66. As shown in FIG. 12, this rotating body 67 is interlocked with a motor 71 via a sprocket 68 attached thereto, a chain 69 that spans the sprocket 68, and a sprocket 70 that meshes with the chain.

Further, an upper hopper portion 3 is provided at the upper and lower positions of the cylindrical body 66.
A slit 72 that communicates with the interior of the rotating body 67 and a slit 73 that communicates with the lower hopper portion 53b are formed along the axial direction, and a plurality of slits each having a required volume are formed on the outer peripheral surface of the rotating body 67 along the axial direction. A measuring groove 74 is formed.

Therefore, when the rotary body 67 is rotated by the motor 71, the powder paint in the upper hopper portion 3a flows into the measuring groove 74 in the rotary body 67 through the slit 72.
Furthermore, when the metering groove 74 overlaps the lower slit 73 due to the rotation of the rotating body 67, the powder coating material in the metering groove 74 flows into the lower hopper portion 53b. By appropriately setting the rotational speed of the rotating body 67, the amount of powder coating material supplied from the upper hopper section 53a to the lower hopper section 53b can be adjusted.

Furthermore, a shutter 75 for opening and closing the opening of the lower hopper section 53b is provided. This shutter 75
is swingably attached to the hopper section 53b via a bin 76, and a cylinder device 77 is provided between the shutter 75 and the hopper section 53b.
By swinging the shutter 75 back and forth, the opening of the hopper section 53b can be opened and closed.

Next, the above-mentioned supply means 55 circulates and supplies the powder coating material dropped from the opening of the lower hopper section 53b and collected in the lower recovery tank 54 to the upper hopper section 53a.
As shown in Figure O, the bottom of the recovery layer 54 and the hopper part 53a
A flexible conduit 80 that communicates with the upper part of the hopper part 3a has one end connected to the suction port of a vacuum pump 81, and the other end connected to the hopper part 3a through a labyrinth 82 and a screen 83 provided in the upper part of the hopper part 3a. 3a.

The flexible conduit 80 allows the collection tank 54 to move up and down, and the vacuum pump 81 is operated with the shutter 75 closed to remove the powder paint collected in the collection tank 54. Hopper section 53 via conduit 80 due to negative pressure
It is designed to be sucked in. At that time, the powder paint sucked into the hopper section 53 from the conduit 80 is transferred to the labyrinth 82.
Most of the powder paint is separated from the suction air flow and falls downward, and the powder paint that has flowed into the labyrinth 82 is prevented from being sucked into the vacuum pump 81 by the screen 83.

Therefore, in the above configuration, as described above, when the second fork 22 receives the holder 2 carried out from the heating furnace 20 at the receiving position A, the second fork 2
2 is moved from the receiving position A to the painting position B.

At this time, the shutter 75 of the hopper 53 is closed, and the recovery tank 54 is located at the lower end position.

When the second fork 22 is in the coating position B and the workpiece 1 held by the second fork 22 is located above the collection tank 54, the collection tank 54 is moved to the lifting cylinder device 57.
The workpiece 1 is housed inside the workpiece.

When the recovery tank 54 is raised, the cam member 63 attached thereto engages with the cam follower 61 attached to the second fork 22 to raise it, and as it rises, the second fork 22 is raised. Rock upward. As a result, the engagement protrusion 2e of the holder 2 held by the second fork 22 engages with the engagement clutch 65 that is interlocked with the motor 64, and the workpiece 1 is tilted at a position below the hopper portion 53.

In this state, the motor 64 is rotationally driven to rotate the holder 2 and the workpiece 1. In addition, the hopper section 5
The motor 71 provided at 3 is started and rotates the rotating body 67, and the powder coating material in the upper hopper section 3a is supplied to the lower hopper section 53b according to the rotation speed, and the cylinder device 77 is used to close the shutter. 75 is opened, and the powder paint in the lower hopper portion 53b is sprayed onto the rotating workpiece 1 by its own weight.

At this time, the powder coating comes to adhere to the rotating workpiece 1 in the area shown by diagonal lines in FIG. By maintaining the conditions substantially constant, the paint can be deposited in a substantially straight line.

Since the contact time between the powder coating and the workpiece 1 is substantially constant over the entire coating surface, the thickness of the coating can be made uniform.Moreover, in this embodiment, the workpiece 1 is tilted. Therefore, it is possible to prevent powder paint from adhering to the lower end surface 1a of the work 1. Note that the lower end surface 1a
If it is necessary to apply a powder coating to the lower end surface 1a, a blower may be provided to spray the powder coating toward the lower end surface 1a.

When the spraying of the powder coating onto the workpiece 1 is completed as described above, the rotation of the rotating body 67 is stopped, the shutter 75 is closed, and the rotation of the workpiece 1 is also stopped.

In this state, at the same time as the collection tank 54 is lowered,
Accordingly, the second fork 22 is returned from the inclined state to the horizontal state.

When the recovery layer 54 reaches the lowering end position, the old vacuum pump is started, and the powder paint in the recovery tank 54 is sucked into the upper hopper section 3a through the conduit 80 by negative pressure, and a new workpiece 1 is The work is completed and the operation of the vacuum pump 81 is stopped before the vacuum pump 81 is carried into the recovery layer 54.

On the other hand, workpiece 1, which has been coated with powder paint, is
When the fork 22 moves from the painting position B to the delivery position C, it is carried out from the collection layer 54, and when the second fork 22 reaches the delivery position C, the holder 2 held by it is separated from the second fork 22. being the first
It is delivered to a cooling conveyor 89 via a delivery device 88 shown in the figure.

The second fork 22 from which the holder 2 has been removed moves from the delivery position C past the painting position B to the original receiving position A.
The receiving position A receives a new workpiece 1 taken out from the heating furnace 20 again.

Next, at the delivery position C, an engagement groove 90 that engages with the annular groove 2d below the holder 2 is formed in the machine frame 5 described above. The engagement groove 90 is formed obliquely in a direction away from the second fork 22 from a position where it can engage with the annular groove 2d of the holder 2 held and conveyed by the second fork 22. The inclined portion is formed parallel to the moving direction of the second fork 22 from the tip thereof.

The delivery device 88 provided at the delivery position C includes a cylinder device 91 arranged parallel to the moving direction of the second fork 22, and a pressing member 92 attached to the tip of the piston rod. The member 92 allows the holder 2 to be moved along the engagement groove 90.

The cooling conveyor 89 is provided with an endless chain 93 that circulates intermittently in a horizontal plane, and is provided at predetermined intervals on this chain 93, and engages with the current groove 2C above the holder 2 to hold it. Each bracket 94 stops at a position facing the engagement groove 90 and can receive the holder 2 moved by the delivery device 88.

Therefore, when the holder 2 is held by the second fork 22 and transported to the delivery position C, the holder 2
The lower annular groove 2d engages with the engagement groove 90, and the holder 2 moves forward relative to the second fork 22 due to the inclined portion of the engagement groove 90 as the second fork 22 moves. and then they will be separated.

Then, when the holder 2 is separated from the second fork 22,
The cylinder device 91 of the delivery device 88 is operated, the pressing member 92 moves the holder 2 along the engagement groove 90, and the cooling conveyor 89 is waiting in front of the engagement groove 90.
The holder 2 is delivered to the bracket 94 of. Thereafter, the cooling conveyor 89 transports the holder 2 intermittently, and the workpiece 1 is gradually cooled during this time.

"Effects of the Invention" As described above, according to the present invention, by maintaining constant spraying conditions of powder paint, it is possible to reduce the waving phenomenon at the adhesion boundary surface of the paint compared to the conventional method. Therefore, the effect is obtained that the paint can be deposited so that the boundary surface to which the paint is deposited is substantially constant.

In addition, even when the above masking is used, it is possible to reduce the adhesion of powder paint at the border of the masking compared to the conventional method, and the occurrence of paris that is likely to be formed in that area after the masking is removed. The subsequent deburring work can be omitted or simplified.

Furthermore, since the powder coating is sprayed onto the rotating workpiece, the contact time between the workpiece and the powder coating can be made substantially constant over the entire painted surface, thus ensuring a uniform paint film thickness. Furthermore, the coating range can be set more freely than in the past.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
3 is a partially sectional front view showing the holder 2 disassembled into two members 2a and 2b, and FIG. 4 is the member 2b of FIG. 3.
, FIG. 5 is a top view of the holder 2, FIG. 6 is an enlarged plan view of the main part of FIG. 1, FIG. 7 is a partially sectional front view of FIG. 6, and FIG. Figure 9 is a right side view of Figure 8, Figure 1θ is a view taken in the X direction of Figure 1, Figure 11 is a cross-sectional view taken along the line - ■ of Figure 1O. Half sectional view along, 1st
FIG. 2 is a cross-sectional view taken along the line ``--'' in FIG. 11. 1.-Work 2.-Holder 7...1st
Work conveyance means 19--Carrying in/out means 2〇-Heating furnace 52--Powder coating means 53--Hopper 54--Recovery tank 55--Supplying means
5 B--Work rotation drive means Fig. 5 Fig. 4

Claims (2)

[Claims] (1) In a powder coating method in which a workpiece is heated to a required temperature and then powder coating is applied to the workpiece, the powder coating is applied by spraying the powder coating while rotating the workpiece. A powder coating method characterized by adhering to the workpiece. (2) a workpiece rotating means for holding and rotating a workpiece heated to a required temperature; a hopper located above the workpiece for spraying powder coating onto the workpiece; and a hopper provided below the hopper; A powder coating apparatus comprising: a collection tank for collecting powder paint from a hopper; and a supply means for circulating and supplying the powder chamber material collected in the collection tank to the hopper.