JPH0994490A - Electrostatic coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the rear end of an electrostatic coater at an earth potential without increasing the size of this coater and to eliminate the need for the measure to insulate the coating material supply piping to be connected thereto at all by integral providing the inside of a housing with a coating material pump. SOLUTION: The rear end of the coating material pump 10 fixed to a high voltage impressing section H on the front end side of the coater is covered with a bucket-like insulating cover 14 which has an aperture on the front end side of a housing and is hermetically closed on the rear end side. This insulating cover 14 is rotated forward and backward by a motor 15 mounted at an earth section E. The piston 13 of the coating material pump 10 is advanced and retreated by a feed screw 17 mounted at the inside thereof. A coating material supply system 11 for supplying the coating material to the coating material pump 10 is so constituted that a coating material supply port 19 connected to a coating material supply source is engaged and disengaged by advancing and retreating to and from the position apart by an insulating distance from a coating material inflow port (18) mounted at the high voltage impressing section H and connected to the coating material pump 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic coating machine for supplying paint to a rotary atomizing head which is driven to rotate at a high speed and to which a high voltage is applied, and electrostatically atomizes it. The present invention relates to an electrostatic coating machine suitable for electrostatically coating conductive paint such as paint.

[0002]

2. Description of the Related Art Generally, electrostatic coating is performed on the electrostatic coating machine side by -8
A high voltage of 0 to 120 kV is applied, the side of the object to be coated is set to ground potential, an electrostatic field is formed between the electrostatic coating machine and the object to be coated, and the coating particles sprayed from the electrostatic coating machine are removed. By charging the cathode, it is electrostatically applied to the object to be coated, which is the opposite electrode of the anode. In this case, in order to prevent the high voltage applied to the electrostatic coating machine from leaking when coating conductive paint such as water-based paint or metallic paint with the electrostatic coating machine to which a high voltage is applied. , It is necessary to insulate the paint supply system consisting of paint supply pipes connected to the electrostatic coating machine, paint tank, paint pump, etc. In the multicolor electrostatic coating apparatus, there is a trouble that the paint supply system must be insulated for each color paint.

Therefore, the applicant of the present invention has proposed an electrostatic coating device which does not require any insulation measures in the paint supply system for each color paint (Actual No. 4-87755, No. 4-87756).
Actual Kaihei 4-87758, Actual Kaihei 4-87759, Actual Kaihei 4-87760, Actual Kaihei 4-91755, Actual Kaihei 4-91756, Actual Kaihei 6-57444, Actual Kaihei 6-60451, Actual Kaihei 6-60452, JP-A-4
-63156, JP-A-4-200662). FIG. 4 is a flow sheet showing a schematic configuration thereof, in which a paint pump 43 for pressing a required amount of paint flowing from the paint inlet 41 at a predetermined flow rate from the paint outlet 42 is connected to the electrostatic coater 44. In addition, a paint supply pipe 46 for selectively supplying each color paint, cleaning liquid, and cleaning air from the color changing device 45 is connected to the pump 43.
Then, the paint supply pipe 46 is divided into an upstream side 46A connected to the color changing device 45 and a downstream side 46B connected to the paint pump 43, and the tips thereof are detached from a position separated by an insulation distance. It is designed to be connected freely.

According to this, when the high voltage is not applied to the electrostatic coating machine 44, the coating material supply pipe 46 is connected to store the coating material in the coating material pump 43, and the high voltage is applied to the electrostatic coating machine 44. At the time of the applied coating, the paint supply pipe 46 is divided to electrically insulate the color changing device 45 from the electrostatic coating machine 44, and the paint stored in the pump 43 is squeezed out to perform the coating. There is. Therefore, if insulation measures are taken from the electrostatic coating machine 44 to the downstream side 46B of the paint supply pipe 46, the color changing device 45 can be supplied from each paint supply source (not shown).
It is not necessary to take any insulation measures up to the upstream side 46A of the paint supply pipe 46 via the.

[0005]

However, even in this case, since a high voltage is applied to the electrostatic coating machine 44, this is applied to the lifting frame of the automatic coating apparatus such as a top machine or the tip of the weaving arm of the coating robot. High voltage is applied to the elevating frame and the weaving arm when it is attached to the machine, so it is necessary to take safety measures such as putting a protective net around them so that workers do not approach them. The problem remains.

As shown in FIG. 5, the electrostatic coating machine 44
If the housing 54 including the rotary atomizing head 52 and the air motor 53, the paint pump 43, etc. are housed and arranged on the front end side of the housing 51 of FIG. Since high voltage is not applied up to, it is not necessary to insulate them or to install a protective net. However, since a high voltage is applied to the machine body 54 of the electrostatic coating machine 44 and the paint pump 43 is also forced to be electrically connected to the machine body 54, the rear end portion 55 of the housing 51 is set to the ground potential. In order to achieve this, the length of the electrostatic coating machine 44 needs to be at least the length x of the machine body 54 + the accommodation length y of the paint pump 43 + the insulation distance z, and the total length of the electrostatic coating machine 44 becomes long and becomes large. There was a problem.

In particular, when the electrostatic coating machine 44 becomes large in size, when the rear end is attached to the elevating frame or the weaving arm of the coating robot for use, the heavy machine body 44 is disposed at the tip side. Therefore, not only when changing the posture by tilting the lifting frame etc., but also by just supporting it horizontally, the lifting frame and electrostatic coating machine 4
A large load is applied to the rear end portion of No. 4. Therefore, in the present invention, a paint pump is integrally provided in the housing so that the rear end of the paint pump can be maintained at the ground potential, and no insulation measures are required for the coating device that supports the electrostatic coating machine. The technical issue is to make the coating machine compact and reduce the load on the coating equipment.

[0008]

In order to solve this problem, according to the present invention, an airframe in which a rotary atomizing head is attached to a tubular rotary shaft of an air motor is arranged on the tip side of a housing, and the tubular rotary shaft is provided with A thin tubular nozzle for supplying paint to the rotary atomizing head is inserted through the thin tubular nozzle while applying a high voltage to the rotary atomizing head and driving the air motor to rotate the rotary atomizing head at high speed. In the electrostatic coating machine for electrostatically atomizing the supplied paint, the housing is provided between a high voltage applying section on the front end side where the machine body is arranged and a grounding section on the rear end side connected to the grounding body. It is formed of an insulating material over at least a predetermined insulating length, inside which a paint pump that presses the paint into the thin tubular nozzle is arranged, and the paint supplied from a paint supply source is applied to the paint. Storage in pump A paint supply system is formed, and the paint pump includes a paint cylinder fixed to the high-voltage applying section and a piston that presses out the paint in the cylinder, and the rear end side has an opening at the front end side of the housing. It is covered with a formed bucket-shaped insulating cover and maintained in an electrically insulated state with the ground portion, and the insulating cover is attached to the rotating shaft of the motor fixed to the ground portion, and inside thereof, A feed screw for screwing a screw attached to the piston to move the piston forward and backward is provided, and the piston is moved forward and backward by rotating the insulating cover forward and backward. The connected paint inflow port is attached to the high voltage applying section, and the paint supply port connected to the paint supply source is grounded to the paint inflow port. Characterized in that is retractable from a position separated by a predetermined insulation distance on the side which is formed so as to be disengageably connected.

According to this, in the housing of the electrostatic coating machine, at least a predetermined insulation is provided between the high-voltage applying section on the front end side where the machine body is arranged and the grounding section on the rear end side connected to the grounding body. Since it is formed of an insulating material over the length, the high voltage applied to the high voltage applying portion does not travel along the surface of the housing and leak to the ground portion. In addition, the paint pump housed in the housing has a bucket in which the paint cylinder is fixed to the high-voltage applying part, and even if the rear end projects toward the ground part, the housing has an opening at the front end and the rear end is sealed. Since it is covered with the insulating cover, the paint pump is maintained in an insulating state with the ground portion even if there is not a sufficient insulation distance space between the paint pump and the ground portion. Therefore, it suffices to secure a required insulation distance from the tip end side opening of the bucket-shaped insulating cover that covers the paint pump to the grounding portion, and the electrostatic coating machine can be made compact because its total length is shortened.

Further, with respect to the paint inflow port attached to the high voltage applying part and connected to the paint cylinder, the paint supply port is moved forward and backward from a position separated from the ground part by a predetermined insulation distance to be detachably connected. Therefore, when a high voltage is not applied to the high voltage applying section,
If the paint supply port is advanced to the paint inflow port and each port is connected to supply the paint from the paint supply source,
A required amount of paint can be stored in the paint cylinder, and when a high voltage is applied to the high voltage application section, the paint supply port can be retracted to separate it from the paint inflow port by an insulating distance. In this way, when the high voltage is applied, the paint supply port and the paint inflow port are maintained in the insulated state, so that the high voltage does not leak through these ports.

The insulating cover is attached to a ground portion so as to be rotatable in the forward and reverse directions by a motor, and a feed screw which is screwed into a screw attached to the piston is provided inside the insulating cover. If the cover is rotated in the forward direction, the piston is screw-fed by the feed screw to advance, and the paint in the paint cylinder is pressed out to the rotary atomizing head.
When the insulating cover is rotated in the reverse direction, the piston is screw-fed by the feed screw and retracts, so that the paint is injected into the paint pump. In this case, the feed screw screwed into the screw attached to the piston and the rotation shaft of the motor rotate together, but the rotation shaft of the motor is attached to the outside of the insulating cover and the feed screw is placed inside the insulating cover. Installed,
Since the feed screw and the rotary shaft of the motor are connected in an insulated state via the insulating cover, high voltage does not leak to the motor via the feed screw and the rotary shaft.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below based on the embodiments shown in the drawings. FIG. 1 is a flow sheet showing a schematic configuration of an electrostatic coating machine according to the present invention, and FIG. 2 is a sectional view showing details thereof.

In FIG. 1, reference numeral 1 denotes an electrostatic coating machine connected to a color changing device 2 for selectively supplying each color paint, cleaning liquid, and cleaning air. A rotary atomizing head 4 is provided on the front end side of a housing 3. Is attached to the tubular rotary shaft 6 of the air motor 5,
A thin tubular nozzle 8 for supplying paint to the rotary atomizing head 4 is inserted through the tubular rotary shaft 6 to rotary atomize a high voltage supplied from a high voltage generator 9 arranged in the housing 3. The paint supplied from the thin tubular nozzle 8 is electrostatically atomized while being applied to the head 4 and driving the air motor 5 to rotate the rotary atomizing head 4 at high speed.

The thin tubular nozzle 8 inserted into the tubular rotary shaft 6 of the air motor 5 has a nozzle body 8c having an opening 8a at the tip and a paint discharge port 8b at the rear end. , A tubular needle 8d that is inserted thereinto to open and close the tip opening 8a. Paint is supplied into the nozzle body 8c through the tubular needle 8d, and the tubular needle 8d is retracted to open the tip opening 8a. When this happens, the paint is discharged from the opening 8a and the rotary atomizing head 4
Is supplied to.

The housing 3 includes a high-voltage applying portion H on the tip side where the machine body 7 is arranged, and a grounding portion E on the rear end side which is attached to a grounding body such as a weaving arm (not shown) of a painting robot. Is formed of an insulating material over at least a predetermined insulation length z, and a paint pump 1 for pressing out the paint to the inside of the thin tubular nozzle 8 therein.
0 is provided, and a paint supply system 11 for storing the paint supplied from a paint supply source (not shown) through the color changing device 2 in the paint pump 10 is formed.

The paint pump 10 is composed of a paint cylinder 12 fixed to the high voltage applying section H and a piston 13 for pressing out the paint in the cylinder 12, the rear end of which projects toward the earth section E. It is provided. Therefore, even if a predetermined insulation distance is secured between the high voltage applying portion H and the ground portion E, the insulation distance is not secured between the rear end portion of the paint pump 10 and the ground portion E. When a high voltage is applied to the high-voltage applying section H, it leaks to the ground section E via the paint pump 10. Therefore, the rear end side of the paint pump 10 is covered with a bucket-shaped insulating cover 14 having an opening formed at the front end side of the housing 3 and the rear side of which is sealed, so that the paint pump 10 is electrically insulated from the ground portion E. It is designed to maintain and prevent high voltage leakage.

The insulating cover 14 is fixed to the rotating shaft 16 of the electric motor 15 whose outer side is fixed to the ground portion E, and the inner side of the insulating cover 14 is provided with a screw 13b formed on the piston rod 13a of the piston 13. A ball screw (feed screw) 17 is screwed to move the piston forward and backward. When the paint is injected, the insulating cover 14 is rotated in the opposite direction to retract the piston 13, and when the paint is discharged, the insulating cover 14 is rotated in the forward direction. Piston 1 by doing
It is designed to advance three.

The paint supply system 11 has a paint inflow port 18 connected to the paint cylinder 12 and a paint supply port 1 connected to a paint supply source via a color changing device 2.
9, the paint inflow port 18 is attached to the high-voltage applying section H, and the paint supply port 19 is attached to the tip of the piston rod 21 of the main cylinder 20,
The paint inlet port 18 is connected to the paint inlet port 18 so that the paint inlet port 18 can be engaged with and disengaged from the paint inlet port 18 by a predetermined insulation distance.

The ends of the paint inflow port 18 and the paint supply port 19 are opened by engaging them,
Valves 22 and 23 are formed which are closed when the two are separated. As shown in FIG. 3, each valve 22, 23 is provided with a valve body 22b, 23b for closing the paint inlet / outlet 22a, 23a and a spring 22c, 23c for biasing the valve body 22b, 23b in the closing direction. Operation protrusions 22d protruding from the entrances 22a, 23a are provided on the bodies 22b, 23b.
23d is provided so that when the ports 18 and 19 are engaged with each other, the operation protrusions 22d and 23d are pushed into each other to open the entrances 22a and 23a.
Further, for example, on the front surface of the valve 22 on the paint inflow port 18 side, a resinous valve seat 23e formed on the front surface when engaged with the valve 23 on the paint supply port 19 side.
An annular projection 22e that is in close contact with is formed so as to surround the entrance / exit 22a.

A cleaning cover 24 is formed at the tip of the piston rod 21 of the main cylinder 20 so as to cover the paint supply port 19, and the cleaning cover 24 is provided with a cleaning cover 24 when the ports 18 and 19 are brought close to each other. Boat 18,19
Cleaning liquid ejection port 24a for injecting cleaning liquid onto the tip of the
And a discharge port 24b for discharging the cleaning liquid is formed. The main cylinder 20 is attached to the rear end of the main cylinder 20 so as to be slidable back and forth along a frame 26 fixed to the ground portion E by a sub-cylinder 25 having a short stroke.
When the sub-cylinder 25 is extended while 0 is extended, the ports 18 and 19 are covered with the cleaning cover 24, and the ports 22 and 23 are engaged with each other to open the valves 22 and 23 to bring the paint supply system 11 into conduction. It

Next, from this state, the sub cylinder 25
When only the ports 18 and 19 are contracted, the ports 18 and 19 are disengaged, the valves 22 and 23 are closed, and the paint supply system 11 is shut off, but the ports 18 and 19 are covered with the cleaning cover 24. Therefore, if the cleaning liquid is supplied into the cleaning cover 24 in this state, the paint adhered to the tips of the ports 18 and 19 is cleaned and removed.

When the main cylinder 20 is contracted, the paint supply port 19 retracts and the paint inflow port 18
Since the insulation distance is away from, the high voltage does not leak to the paint inflow port 18 attached to the high voltage applying section H. The paint inflow port 18 is connected to the high voltage applying portion H.
When it is not possible to secure a predetermined insulation distance from the ground portion E toward the ground portion E, an insulating cover 27 that moves forward and backward so as to cover the paint inflow port 18 when the paint supply port 19 retracts may be provided. The insulating cover 27 is formed in a cup shape having an open front end, and is configured to be advanced and retracted by the air cylinder 28 to the paint inflow port 18.

Reference numeral 30 is a paint passage connecting the paint inlet port 18 and the paint cylinder 12, and 31 is the paint cylinder 1.
A paint flow path for supplying paint from 2 to the thin tubular nozzle 8, 32
Is a dump passage for discharging the paint recirculated from the thin tubular nozzle 8, 33 is the paint cylinder 12 and the dump passage 3 at the time of cleaning.
It is a bypass flow path that connects the two. Further, 34 is an on / off valve that opens / closes the paint passage 30 when the paint pump 10 is injecting the paint / discharging the paint, and 35 is a tubular needle 8d when the paint is supplied from the paint cylinder 12 to the thin tubular nozzle 8 / when the paint is stopped. Is a trigger valve that opens and closes the paint passage 31 by advancing and retracting the paint passage, 36 is a dump valve that recirculates waste liquid from the thin tubular nozzle 8 when performing color change cleaning, and 37 is an on-off valve that opens and closes the bypass passage 33. .

Further, reference numerals 38 and 39 denote a waste liquid supply port and a waste liquid outflow port which are provided in the dump passage 32. The waste liquid supply port 38 is provided in parallel with the paint inflow port 18 and the waste liquid outflow port. A port 39 is provided in parallel with the paint supply port 19 inside the cleaning cover 24, and when the paint supply port 19 is engaged with the paint inflow port 18 by the cylinders 20 and 25, the waste liquid outflow port 39
Are adapted to engage with the waste liquid supply port 38.

The above is an example of the configuration of the present invention. Next, the operation will be described by taking as an example the case of coating with A color paint, color change cleaning, and then coating with B color paint. First, by extending the main cylinder 20 and the sub-cylinder 25 to engage the paint supply port 19 with the paint inflow port 18,
The valves 22 and 23 of each port 18 and 19 open. Then, while the on / off valve 34 of the paint flow path 30 is opened, the A color paint is supplied from the color changing device 2 and at the same time, when the electric motor 15 is rotated in the opposite direction, the piston 13 is retracted and used in the paint cylinder 12. The amount of paint is injected.

Next, when the on / off valve 34 is closed and the sub-cylinder 25 is retracted when a predetermined amount is accumulated,
Since the ports 18 and 19 are covered with the cleaning cover 24, the cleaning liquid is ejected from the cleaning liquid ejection port 24a to wash and remove the paint adhering to the tips of the ports 18 and 19, and then the main cylinder 20 is contracted. An isolation distance is provided between each port 18 and 19. The paint inflow port 18
Is projected from the high voltage applying portion H, and when the main cylinder 20 is contracted and not separated by the insulation distance, the paint inflow port 18 may be covered with the insulation cover 27.

When the coating is performed, the high voltage supplied from the high voltage generator 9 is applied to the rotary atomizing head 4, and the air motor 5 is driven to rotate the rotary atomizing head 4 at a high speed. The trigger valve 35 is opened and the electric motor 15 is opened.
When the piston 13 of the paint pump 10 is advanced by rotating the paint in the forward direction, the A-color paint is squeezed out from the paint cylinder 12 and supplied from the paint passage 31 to the rotary atomizing head 4 through the thin tubular nozzle 8. And electrostatically atomized.

At this time, since the paint pump 10 and the paint inflow port 18 are attached to the high voltage applying portion H to which a high voltage is applied so as to project toward the ground portion E, the paint pump 10 and the paint inflow port 18 are attached. Rear end and ground E
The paint pump 10 and the paint inflow port 18 are not separated from each other by a predetermined insulation distance.
Since it is covered with 7, the high voltage does not leak through the paint pump 10 and the paint inflow port 18.

Further, the piston 13 of the paint pump 10 is
By rotating the insulating cover 14 in the forward and reverse directions, the ball screw 17 mounted inside the insulating cover 14 advances and retreats, and the ball screw 17 and the rotating shaft 16 of the motor 15 rotate together. Since the ball screw 17 is attached to the outside and the ball screw 17 is attached to the inside of the insulating cover 14, and the ball screw 17 and the rotating shaft 16 of the motor 15 are connected in an insulated state via the insulating cover 14, the piston 13 of the paint pump 10 High voltage does not leak to the motor via the ball screw 17 or the rotary shaft 16.

When the coating is completed, the main cylinder 20 and the sub-cylinder 25 are extended again to engage the ports 18 and 19 and the trigger valve 35.
When the cleaning air and the cleaning liquid are supplied from the color changing device 2 with the other valves 34, 36 and 37 other than the valves open, they remain in the paint supply system 11, the paint pump 10 and the paint supply system 11 in the thin tubular nozzle 8. The color A paint is discharged to the waste liquid tank 40 via the dump dew 32 and the bypass flow path 33. After the paint remaining in each pipe is removed by washing, only the sub-cylinder 25 is contracted this time, and if the washing liquid is supplied into the washing cover 24, the washing liquid is sprayed into the gap between the ports 18 and 19 and the tip thereof. The paint adhering to is removed and the cleaning work is completed. Next, when the cleaning is completed, this time the B color paint is supplied from the color changing device, and once stored in the paint cylinder 12 of the paint pump 10 in the same procedure as the A color paint, it is squeezed out and rotated. The atomizing head 4 may be used to electrostatically atomize the coating.

As described above, in this embodiment, the rear end side of the paint pump 10 and the paint inflow port 18 attached to the high-voltage applying section H has a bucket shape in which the rear end side is closed and has an opening at the front end side of the housing. Since it is covered with the insulating covers 14 and 27 of the above, even if the space between the paint pump 10 or the paint inflow port 18 and the ground portion does not have a sufficient insulating distance, the tip openings of the insulating covers 14 and 27 are opened. If the insulation distance is secured from the portion to the ground portion E, the insulation state can be maintained, and the ball screw 17 for driving the paint pump 10 and the rotary shaft 16 of the motor 15 are insulated by the insulating cover 14.
Since it is connected in an insulated state via the, the paint pump 10 can be driven in an insulated state without forming the rotating shaft 16 of the motor 15 with an insulating rod having a length equal to the insulating distance.
The electrostatic coating machine can be designed compact by shortening its total length.

In the above embodiment, the case where the paint inflow port 18 is covered with the insulating cover 27 has been described. However, when the paint supply port 19 largely projects from the earth portion E to the high voltage applying portion H side, In a state where the main cylinder 20 is contracted and the paint supply port 19 is retracted, the main cylinder 20 may be covered with a cup-shaped insulating cover having an open rear end.

[0033]

As described above, according to the present invention, the rear end portion of the housing can be maintained at the ground potential even when a high voltage is applied to the rotary atomizing head, so that automatic coating for mounting an electrostatic coating machine can be performed. In addition to the insulation measures for the lifting frame of the equipment and the weaving arm of the painting robot, there is no need for any insulation measures for the paint piping from the paint supply source to the painting machine, and the paint pump housed inside the housing Since it is covered with a bucket-shaped insulating cover with an opening formed on the tip side of it and is maintained in an insulated state with respect to the grounding part, high voltage can be achieved even if the paint pump and the grounding part are not separated by a predetermined insulation distance. Does not leak, and with a ball screw that advances and retracts the piston of the paint pump,
Since the rotating shaft of the motor that drives it is connected to the insulating state via the insulating cover, the paint pump can be driven in the insulating state even if the rotating shaft of the motor is shortened. It has a very excellent effect that the coater can be downsized.

[Brief description of drawings]

FIG. 1 is a flow sheet showing a schematic configuration of an electrostatic coating machine according to the present invention.

FIG. 2 is a sectional view showing the details.

FIG. 3 is a sectional view showing the main part thereof.

FIG. 4 is a flow sheet showing a conventional device.

FIG. 5 is a flow sheet showing a conventional device.

[Explanation of symbols]

1 ... Electrostatic coating machine 2 ... Color changing device 3 ... Housing 4 ... Rotating atomizing head 5 ... Air motor 6 ... Tubular rotating shaft 7 ... Machine body 8 ... Capillary tube Nozzle 9 ... High voltage generator H ... High voltage application part E ... Ground part 10 ... Paint pump 11 ... Paint supply system 12 ... Paint cylinder 13 ... Piston 13a.・ Piston rod 13b ・ ・ Screw 14 ・ ・ ・ Insulation cover 15 ・ ・ ・ Electric motor 16 ・ ・ ・ Rotating shaft 17 ・ ・ ・ Ball screw (feed screw) 18 ・ ・ ・ Paint inflow port 19 ・ ・ ・ Paint supply port

Claims (1)

[Claims] 1. An airframe (7) having a rotary atomizing head (4) attached to a tubular rotary shaft (6) of an air motor (5) is arranged on the distal end side of a housing (3), and the tubular rotary shaft (6). ), A thin tubular nozzle (8) for supplying paint to the rotary atomizing head (4) is inserted to apply a high voltage to the rotary atomizing head (4) and drive the air motor (5). In the electrostatic coating machine that electrostatically atomizes the paint supplied from the thin tubular nozzle (8) while rotating the rotary atomizing head (4) at high speed, the housing (3) is arranged by the body (7). Between the high voltage applying section (H) on the front end side and the grounding section (E) on the rear end side connected to the grounding body is formed of an insulating material over at least a predetermined insulation length, and inside thereof, When a paint pump (10) for pressing out the paint is provided in the thin tubular nozzle (8), A paint supply system (11) for storing paint supplied from a paint supply source in the paint pump (10) is formed in the paint pump (10), and the paint pump (10) is fixed to the high voltage application unit (H). Coating cylinder (12) and a piston (13) that presses out the paint in the cylinder (12), and its rear end side is a bucket-shaped insulating cover (opening is formed at the front end side of the housing (3) ( 14) and is maintained in an electrically insulated state with the ground portion (E), and the insulating cover (14) is attached to the rotating shaft of the motor fixed to the ground portion (E), The piston (13)
The piston (13) is screwed with the screw (13b) attached to the
A feed screw (17) for advancing and retracting the piston is provided to rotate the insulating cover (14) forward and backward to move the piston (12) forward and backward, and the paint supply system (11) is configured to move the paint cylinder (12). ) Is attached to the high voltage applying section (H), and the paint supply port (19) connected to the paint supply source is grounded to the paint inflow port (18). An electrostatic coating machine, characterized in that the electrostatic coating machine is formed so as to be moved forward and backward from a position separated by a predetermined insulation distance to the (E) side and detachably connected.