JP2780017B2 - Electrostatic powder coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a means for partially coating various works such as an armature of a motor, for example, and is used to statically charge a powder coating material and electrostatically apply it to the surface of the work. The present invention relates to an electric powder coating apparatus.

[0002]

2. Description of the Related Art In an armature of a motor, slots for winding excitation coils are formed at equal intervals in a circumferential direction on a core on which a magnetic metal plate is laminated, and an insulating coating is applied in the slots. Is done. Conventionally, such paintings
A coating apparatus using a hot spray method and a fluid immersion method is used.

[0003]

However, according to the prior art, when the work is, for example, the above-described armature, it is difficult to form a uniform coating film in each slot of the core. It has been pointed out that it is difficult to improve the performance. Therefore,
A main technical problem to be solved by the present invention is to form a uniform coating film on a work having a complicated shape, and to improve productivity.

[0004]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, the electrostatic powder coating apparatus according to the present invention comprises: a powder paint electrostatic adhering section for charging the air-laid powder paint and electrostatically adhering to the surface of the work; A curing section for heating and melting and fixing the body paint layer; a work transport path for continuously transporting the work in a non-intermittent state via the powder paint electrostatic adhesion section and the curing section in sequence; Attach a masking jig with a convex part at the outer end axis to the non-painted part of the work sent to the body paint electrostatic adhesion part
And a jig mounting portion that performs
Via a masking jig attached to the unpainted part of the
And a pair of transfer screws supporting the work
And the transfer screw
In front of the masking jig displaced in a direction perpendicular to the direction
Through the masking jig by contact with the convex part
The work is provided with a guide member that applies a rotational force to the work .

[0005] In the above description, "continuously transported in a non-intermittent state" means that a large number of works are continuously and sequentially transported at appropriate intervals, for example, as transported by a screw conveyor or a belt conveyor. Say the state.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment of the present invention, the rotation applying section applies rotation to a work passing through a curing section . Further, in front of the jig mounting section, a heating degreasing section for evaporating residual grease of the work is arranged. Further, a jig removing section for removing the masking jig from the unpainted portion of the work that has passed through the curing section, and a jig returning section for returning the masking jig from the jig removing section to the jig mounting section. Prepare.

[0007]

[Working] First, a masking jig is mounted on a non-painting portion by a jig mounting portion, and the work is conveyed to a work discharge portion via a powder paint electrostatic adhesion portion and a curing portion sequentially through a work conveyance path. You. In the process of passing through the powder paint electrostatic adhesion part, the charged powder paint is electrostatically adhered to the surface of the work other than the non-painted part masked by the masking jig. In the process of being conveyed through the powder paint electrostatic adhesion portion, the work is rotated, so that the powder paint layer is uniformly formed over the entire circumference due to the electrostatic adhesion of the powder paint. The powder coating layer is heated and melted and fixed on the surface of the work in the process of passing the work through the next curing section, thereby forming a coating film. At this time, even when the workpiece is rotated even when passing through the curing section, the coating film is uniformly formed by melting the powder coating layer.

The work transfer path is formed by a pair of transfer screws.
Because of the feed mechanism, the work is supported on the transfer screw via a masking jig attached to the unpainted portion of the center shaft, and is stably transferred by the screw propulsion. In this case, the workpiece in the transport process is
Is displaced in the direction orthogonal to the transport direction by the rotation of the
The convexity of the outer end axis of the masking jig attached to its central axis
When the part comes into contact with the guide member, the work is automatically rotated via the masking jig during the transfer process, so that a driving device for rotating the work is not required.

The heating degreasing section disposed in front of the jig mounting section volatilizes and removes oils and fats adhering to the work by heating, thereby improving the fixability of the coating film formed in the curing section. In particular, when the painted portion of the work is a laminate of a large number of plates, it is possible to reliably remove oils and fats remaining between the laminated plates.

[0010] The work which has completed the coating after passing through the curing section has the masking jig removed from the non-painted section by the jig removing section and is discharged outside the apparatus. The removed masking jig is returned to the jig mounting section by the jig returning section, and can be reused.

[0011]

FIG. 1 schematically shows an overall configuration of an electrostatic powder coating apparatus 1 according to a preferred embodiment of the present invention. FIG. 1 shows a work 2 to be performed. First, the work 2 shown in FIG. 2 will be described.
An armature of a C motor, a cylindrical core 2a in which a number of magnetic metal plates are laminated, and rotating shafts 2b, 2c (both rotating shafts 2b, 2c which protrude from the axial center of the core 2a in both axial directions). The core 2a is formed with a large number of slots 2d for winding the exciting coil at equal intervals in the circumferential direction. Electrostatic powder coating equipment 1
Are applied to the dotted portions in the figure, that is, to both end surfaces in the axial direction of the core 2a and the inner surface of each slot 2d, and to the outer peripheral surfaces of the rotating shafts 2b and 2c on the core 2a side.

As shown in FIG. 1, an electrostatic powder coating apparatus 1 according to this embodiment comprises a heating degreasing section 11, a first cooling tower 12, a jig mounting section 13, and a powder paint electrostatic adhering section 14. , A workpiece outer peripheral cleaner 15 and a jig cleaner 16
And the curing unit 17 and the second cooling tower 18
And the jig removing section 19 are arranged linearly in the work transfer direction.
9, a work transfer path is provided. Also, the jig mounting section 13 and the jig removing section 19 are provided with a jig returning section 20.
Are provided continuously with each other.

A work transfer path which sequentially passes through the heating degreasing section 11 to the jig removing section 19 includes an in conveyor 21 serving as a work supply section and a first transfer screw reaching the first cooling tower 12 through the heating degreasing section 11. 23, a chain 122 provided inside the first cooling tower 12,
A second transport screw 25 that reaches the inside of the second cooling tower 18 through the jig mounting portion 13, the powder paint electrostatic adhesion portion 14, the workpiece outer peripheral cleaner 15, and the curing portion 17,
A chain 182 provided inside the second cooling tower 18, an out conveyor 27 serving as a work discharge unit,
A pick-up handler 22 for continuing the work transfer path between the in-conveyor 21 and the first transfer screw 23; a first traverser 24 for connecting the work transfer path between the chain 122 of the first cooling tower 12 and the second transfer screw 25; , The chain 182 of the second cooling tower 18
And a second traverser 26 for making the work carrying path continuous between the second traverser 26 and the out conveyor 27. The heating degreasing unit 11, the first cooling tower 12, and the first transport screw 23 are disposed on the heating degreasing side frame 28, and the jig mounting unit 13
The jig removing unit 19, the jig returning unit 20, and the second transport screw 25 are arranged on the coating side frame 29.

A heating control panel 281 is provided on the upper surface of the heat degreasing side frame 28, and a dustproof cover 282 for sealingly covering the heat degreasing unit 11 can be detachably attached. A door 283 is provided. A coating control panel 291 is provided on the upper surface of the coating side frame 29, and a jig mounting section 13, a powder paint electrostatic adhesion section 14, a work outer circumference cleaner 15, a curing section 17, and a jig removing section 19 are provided. A dust-proof cover 292 that hermetically covers each of them can be detachably attached,
On the front surface, a door 293 for checking the device is provided.

A series of operations from the supply of the work 2 from the in-conveyor 21 by the pickup handler 22 to the discharge of the coated work 2 to the out-conveyor 27 are performed step by step by an internal sequence circuit. Is performed.

Hereinafter, the schematic structure and operation of each part of the electrostatic powder coating apparatus 1 according to this embodiment will be described in order along the transport direction of the workpiece 2.

The in-conveyor 21 is located outside the heating and degreasing side frame 28 and is for aligning and transferring the work 2 chemically cleaned in the preceding step (not shown) to the heating and degreasing unit 11. As shown in the figure, a conveyor body 211 composed of a highly wear-resistant Transilon belt driven by a continuously variable motor and a conveyor body 21
A pair of guide rails 212 fixedly arranged to be positioned on both sides of the core 2a of the work 2 to be transported on the work 1 in order to align the work 2, and a drop of the work 2 from the tip of the conveyor body 211 Stopper 213 for preventing
And a work detection sensor (not shown) for detecting when a predetermined number of works 2 are accumulated on the conveyor body 211 by the stopper 213. That is,
In the in-conveyor 21, the work 2 coming out of the chemical cleaning step is sequentially transferred on the conveyor main body 211 while being guided by the guide rail 212, and is stopped by the stopper 213.
, And when a predetermined number is accumulated, the preceding process (chemical cleaning process) is stopped by a detection signal from the work detection sensor.

The pickup handler 22 sequentially supplies the workpieces 2 on the in-conveyor 21 onto a first transport screw 23 passing through the heating and degreasing unit 11, and as shown in FIG. An air-cylinder driven chuck that grips the foremost rotating shafts 2b and 2c of the work 2 that is in contact with the stopper 213 at the distal end position and releases the rotating shafts 2b and 2c at the proximal end position of the first transfer screw 23. 221 and a positioning moving unit (not shown) for reciprocating the chuck 221 between the front end position of the in-conveyor 21 in the conveying direction and the base end position of the first conveying screw 23 as shown by an arrow V in the figure. .

As shown in FIG. 4, the first transport screw 23 is a pair of screw shafts 23 that are laid horizontally and parallel to each other in the workpiece transport direction and are rotated by a variable speed motor.
The work 2 supplied by the pickup handler 22 from the in-conveyor 21 has its rotating shafts 2b and 2c connected to the spiral grooves 2 of the screw shafts 231.
31a and 231a, it is horizontally supported and continuously conveyed by its rotation. Here, since the screw shaft 231 passes through the inside of the heated degreasing unit 11 by a high-frequency induction heating method to be described later, a non-derivative such as an epoxy resin reinforced with glass fiber is used so that the screw shaft 231 is not induction-heated together with the work 2. Become.

The heating degreasing section 11 includes a heating degreasing side frame 2.
8 is provided with a high-frequency oscillator 111 installed outside, and an oscillating coil 112 arranged in the heating degreasing side frame 28. In the heating degreasing section 11, the first transfer screw 23 extends through a space surrounded by the oscillation coil 112 as shown in FIG. Therefore, the work 2 made of a magnetic material conveyed by the first conveyance screw 23 is induction-heated while passing through the oscillation coil 112 for about 50 seconds, so that oils and fats which hinder the coating are vaporized and diffused. You. In particular, in the core 2a having a structure in which a number of thin metal plates are stacked, it is difficult to completely remove oils and fats remaining between the metal plates by ordinary chemical cleaning. Such residual fats and oils between the laminated metal plates can be volatilized and removed effectively.
The work 2 that has passed through the heating degreasing unit 11 is transported to the next first cooling tower 12.

The first cooling tower 12 cools the high-temperature work 2 that has been induction-heated in the heating degreasing section 11 by air cooling. As shown in FIGS. 1 and 6, the first cooling tower 12 circulates through the casing 121. A pair of parallel chains 122 to be moved, and rotating shafts 2b, 2 on both sides of the core 2a in the work 2 in the axial direction provided so as to correspond to each other at predetermined intervals in each chain 122.
and a cooling fan 124 provided at the upper end of the casing 121. When the work 2 induction-heated and degreased by the heating and degreasing unit 11 reaches the inside of the casing 121 of the first cooling tower 12 by the first transfer screw 23, the first transfer screw 2
The chain 1 passing through so as to intersect approximately vertically with the chain 3
The rotation shafts 2b and 2c
And the chain 122 is conveyed in the cooling chamber by the casing 121 by the circulating movement. Then, in this transporting process, it is air-cooled by the cooling fan 124 and is cooled to a temperature below the softening point of the epoxy powder paint described later.

When the cooled work 2 reaches a predetermined position in the circulating movement path in the first cooling tower 12 by the chain 122, the work is cooled by the first traverser 24 from the first cooling tower 12 and, consequently, the heated degreasing side frame 28. It is conveyed toward the painting side frame 29. The first traverser 24 includes a head 241 that lifts the rotating shafts 2b and 2c of the workpiece 2 that have been transferred from the brackets 123 on the chain 122 to the temporary conveyor 244 and aligned as shown in FIG. Tool mounting part 1
The head 242 for lifting the rotating shafts 2b and 2c of the work supported on the third station 131 via the masking jig 3 mounted on the rotating shafts 2b and 2c in a process to be described later, and simultaneously the two heads 241 and 242. It is moved up and down and moved horizontally, as shown by the dashed line in the figure, between the forward end position of the temporary conveyor 244 in the transport direction and the station 131 of the jig mounting section 13 and between this station 131 and the proximal end of the second transport screw 25. And a linear drive unit (not shown) for positioning and reciprocating movement between them.

When a predetermined number of works 2 are accumulated on the temporary conveyor 244, a work detection sensor (not shown) detects this and stops the pre-process (heating degreasing and cooling processes). It is made to let.

The jig mounting section 13 receives the work 2 conveyed by the first traverser 24, and a pair of V-block-shaped stations 131 supporting the rotating shafts 2b and 2c, as shown in FIG. From both sides of the station 131, a pair of chuck heads 132 for inserting and mounting the masking jigs 3 on the non-coating outer peripheral surfaces of the rotary shafts 2b and 2c, respectively, and a linear guide for moving the masking jigs 3 in the mounting direction. A pair of linear ball guide members 133, and the presence or absence of the masking jig 3 in the linear ball guide 133 to detect the presence of the masking jig 3.
And a jig detection sensor (not shown) for stopping the drive when no is detected. Masking jig 3
Are conical flanges 3 at both axial ends of a metal shaft 3a.
b, 3c are formed and one end in the axial direction (the flange 3b
Side) has a structure in which a hole 3d for inserting a rotating shaft is formed. Depending on the length of the hole 3d, there are a rotating shaft 2b and a rotating shaft 2c. The flange 3b on the mounting side is formed of an elastic body such as an elastomer, thereby facilitating insertion into the rotary shaft 2b or 2c, and
It is possible to reliably prevent the powder paint from entering the outer peripheral surfaces of the b and 2c.

That is, one head 241 of the first traverser 24 moves the temporary cooling conveyor 12 on the first cooling tower 12 side to the station 1 of the jig mounting section 13.
When the work 2 is transferred to the station 31,
The masking jigs 3 are mounted on the rotating shafts 2b, 2c of the work 2 protruding to both sides of the work 1 by chuck heads 132, 132, respectively. The work 2 on which the masking jig 3 is mounted is attached to the other head 242 of the first traverser 24.
Is transferred to the base end of the second transport screw 25 extending to the powder paint electrostatic adhering section 14, and at the same time, the one head 241 is simultaneously moved from the temporary conveyor 244 to the next cure by the transport operation. The workpiece 2 with no components is transferred onto the station 131. In this way, the work 2
And mounting of the masking jig 3 is performed.

The second transfer screw 25 is shown in FIGS.
As shown in the figure, a pair of screw shafts 251 similar to the first transfer screw 23 erected horizontally and parallel to each other in the work transfer direction and rotated by a continuously variable speed motor.
And a rotation outside the one of the screw shafts 251 and capable of contacting the central convex portion of the conical flange 3c on the non-mounting side (opposite to the work 2) of the masking jig 3 mounted on the work 2. And a guide member 252 serving as an application section. The screw shaft 251 is connected to the powder paint electrostatic adhesion section 1
4 is made of conductive metal, the surface of which is subjected to hard chrome plating and buffing to have an extremely smooth surface property, so that the powder in the powder paint electrostatic adhesion portion 14 The adhesion of body paint is prevented as much as possible.
The portion passing through the inside 7 is made of a non-derivative such as an epoxy resin reinforced with glass fiber like the first transfer screw 23 so as not to be induction-heated together with the work 2. Further, the screw shaft 251 is connected to the rotating shaft 2 b of the work 2,
The screw shaft 231 of the first transport screw 23 that supports the shaft portion 3a of the masking jig 3 mounted on the shaft 2c and directly supports the rotating shafts 2b and 2c.
It is erected at intervals wider than the interval.

That is, the work 2 transferred from the station 131 of the jig mounting section 13 to the base end of the second transport screw 25 by the first traverser 24 has its rotating shaft 2
The screw shafts 251 are horizontally supported on the spiral grooves 251a, 251a of the screw shafts 251 via the masking jigs 3 mounted on the screw shafts 2b, 2c, and are continuously conveyed by the rotation thereof. Also,
When rotation is given to both screw shafts 251, work 2
Is displaced in the direction perpendicular to the axis of the screw shaft 251 by the friction in the rotating direction at the same time when the screw is conveyed in the axial direction by the screw propulsive force of the spiral groove 251a. Conical flange 3
The top 3c 'of the axis of c contacts the guide member 252.
Therefore, the masking jig 3 is formed by the outer peripheral surface of the shaft portion 3a on which the frictional force with the screw shaft 251 acts and the top 3c 'of the axis of the flange portion 3c on which the frictional force with the guide member 252 acts. , A torque about the axis of the rotating shafts 2 b and 2 c is generated, and the work 2 is
As it is conveyed over, the torque
It rotates around b, 2c.

As shown in FIG. 11, the powder paint electrostatic adhering section 14 includes a case 141 having an open upper end,
41, an electrode plate 142 laid horizontally at a predetermined height, a perforated plate 143 fixed on the electrode plate 142, and an air supply hole 1 opened at a lower portion of the case 141 and through which dry air is blown.
44; a high-pressure generator 145 connected to the electrode plate 142 via a cable 145a; a powder paint supply pipe 146 for supplying a powder paint (eg, epoxy resin powder) 4 to a chamber 149 on the perforated plate 143; A level sensor 147 for detecting the amount of the powder coating material 4 in the chamber 149;
A hood 148 disposed opposite to the upper end opening of the hood 41 and connected to the surplus powder paint collection unit 31 (see FIG. 1) by air suction.
And The second transfer screw 25 is provided in the chamber 149.
Inside (between the case 141 and the hood 148). The high voltage generator 145 can vary the applied voltage in the range of 0 to 58 kV.

That is, the powder paint electrostatic adhesion portion 14
Transmits the high voltage generated by the high voltage generator 145 to the electrode plate 14.
2 to charge the powder coating material 4 through the porous plate 143 and send dry air into the case 141 at a predetermined pressure from the air supply hole 144 to air-lay the charged powder coating material 4. , Perforated plate 1
The particles of the powder coating material 4 floating due to the airflow rising from the 43 side toward the hood 148 repel each other due to the charges having the same sign, and thus are distributed almost uniformly in the chamber 149. On the other hand, the work 2 that is conveyed while being supported on the second transfer screw 25 via the masking jig 3 is grounded via the masking jig 3 and the second transfer screw 25. Therefore, in the process of passing through the chamber 149, the charged powder coating material 4 electrostatically adheres to the work 2 on the surface other than the masking portion by the masking jig 3 according to Coulomb's law. The surplus powder paint that has not passed onto the work 2 and has passed upwards is passed through the hood 148 to the surplus powder paint collection unit 3 outside the paint side frame 29.
0 (see FIG. 1) once and recycled.

The amount of the powder paint 4 in the chamber 149 is constantly detected by the level sensor 147, and based on the detected value, the powder paint 4 from the powder paint supply pipe 146 is supplied.
Is supplied. Therefore, the powder paint 4 in the chamber 149 is always maintained at a constant level, and the powder paint 4 is stably attached to the work 2. Also, the chamber 14
9. Air vent 144 for air laying powder coating 4 within 9
As the air blown from the outside, clean dry air that is dehumidified by a refrigeration air dryer 31 (see FIG. 1) outside the coating side frame 29 and filtered by a micro filter in the air dryer 31 is supplied.

As described above, the second transfer screw 25
The workpiece 2 is rotated about the rotation shafts 2 b and 2 c by the contact between the masking jig 3 and the guide member 252 in the process of being conveyed in the chamber 149 of the powder paint electrostatic adhesion unit 14 by the The electrostatic adhesion of the powder coating 4 is performed uniformly over the entire circumference, and the formation of the powder coating layer in the slots 2d provided at equal intervals in the circumferential direction on the core 2a is also performed extremely uniformly. In addition, since the rotation of the work 2 is not provided by another rotating device or the like, energy is saved .
You.

Further, as shown in FIG.
When the powder coating layer 4a formed on the outer periphery of the core 2a gradually becomes thicker in the course of being conveyed in the inside 9, the narrow opening 2d 'of the slot 2d is further narrowed. It is difficult to enter the core 2a
Is always removed by a scraper (not shown) disposed in the chamber 149, so that the powder coating layer 4a electrostatically adhered to the outer periphery of the The adhesion efficiency of the paint 4 is improved.

As shown in FIG. 13, the outer peripheral cleaner 15 of the work is circulated in the inner chamber of the casing 151 by a casing 151 having an open lower end and a plurality of rollers 152 provided in the casing 151. An endless belt 153 made of a synthetic resin whose lower part of the horizontal moving path is exposed from the lower end opening of the casing 151 and is in contact with the outer peripheral surface of the core 2a of the work 2 on the second conveying screw 25; It comprises a collector 154 arranged outside the belt 153, a cylinder 155 for adjusting the contact height of the endless belt 153 according to the outer diameter of the core 2a of the work 2, and a manual handle 156.

The collector 154 has an opening formed in the endless belt 15.
Cover 154a facing the surface of the endless belt 3, a rotary brush 154b disposed inside the cover 154a to scrape off powder paint on the surface of the endless belt 153, and blowing compressed air toward the surface of the endless belt 153. It comprises an air nozzle 154c and an air inlet 154d for sucking the powder paint removed from the surface of the endless belt 153. The compressed air supplied to the air nozzle 154c is dehumidified and purified by the refrigeration air dryer 31 described above. The intake port 154d is connected to the above-mentioned surplus powder paint collection unit 30 via a duct hose made of a conductive material so that the charged powder paint is not electrostatically attached.

That is, a certain amount of powder paint is electrostatically adhered to the outer peripheral surface of the core 2a of the work 2 which has passed through the chamber 149 of the powder paint electrostatic adhesion section 14 by the second transport screw 25. However, the powder coating is transferred to and removed from the endless belt 153 that comes into contact with the work 2 while the work 2 is conveyed below the work outer peripheral cleaner 15. The powder paint adhered to the endless belt 153 is scraped off by the rotating brush 154b in the collector 154, and the air nozzle 1
54c is removed by compressed air from cover 54c.
a through the air inlet 154d, and the excess powder paint collecting unit 3
Once collected at 0, it is recycled.

As shown in FIG. 14, the jig cleaner 16 includes a plurality of air nozzles 161 arranged to face the outer peripheral surface of the masking jig 3 mounted on the rotating shafts 2b and 2c of the workpiece 2. And a manifold 162 for branching and supplying compressed air to the air nozzle 161. The compressed air supplied to the jig cleaner 16 is also dehumidified and cleaned by the refrigeration air dryer 31. Although the masking jig 3 is made of a material to which the powder paint does not easily adhere electrostatically, the powder paint electrostatic adhering part 14 is required to have a certain degree of powder paint adherence. The powder paint is removed by blowing compressed air before the workpiece 3 is carried into the curing section 17 together with the work 2. This prevents burrs from being formed on the surface of the masking jig 3 by curing, which will be described later, and allows the masking jig 3 to be repeatedly used.

The curing unit 17 has the same configuration as the above-described heating degreasing unit 11. That is, a high-frequency oscillator 171 installed outside the painting-side frame 29 and an oscillation coil 172 arranged inside the painting-side frame 29 are provided. As shown in FIG.
Extending through the space surrounded by. Therefore, the work 2 made of a magnetic material conveyed by the second transfer screw 25 is induction-heated in the process of passing through the oscillation coil 172, and therefore, the thermosetting epoxy resin powder electrostatically adhered to the surface thereof is used. The resulting powder coating layer is polymerized through a gelation process in which the particles are once melted and fused together by heating, crosslinked and cured by a thermosetting reaction, and fixed as an insulating coating film.

The second cooling tower 18 cools the high-temperature work 2 that has been induction-heated by the curing unit 17 by air cooling, and has the same configuration as the first cooling tower 12 described above. That is, as shown in FIG. 1, a casing 181, a pair of parallel chains 182 circulated and moved in the casing 181,
As shown in FIG. 16, a bracket 183 provided at each chain 182 so as to correspond to each other at a predetermined interval and engaged with masking jigs 3 on both sides of the work 2, and a cooling provided at an upper end of the casing 181. And a fan 184. Work 2 induction-heated in curing section 17
When the second conveying screw 25 reaches the inside of the casing 181 of the second cooling tower 18, the bracket 183 on the chain 182 passes through the second conveying screw 25 so as to intersect almost vertically, and the masking jigs 3 The chain 182 is engaged with the shaft 3a.
Is transported in the cooling chamber by the casing 181 by the circulating movement. In this transport process, the cooling fan 184
, And is cooled to almost room temperature.

The rotating shaft 2 of the surface of the workpiece 2
The surface of the b and 2c except for the portion near the core a is not originally coated with the powder coating by the masking jig 3,
Further, since the powder paint adhering to the outer peripheral surface of the core 2a is removed by the work outer peripheral cleaner 15 as described above, the insulating coating film rotates with both the axial end surfaces of the core 2a and the inner surface of each slot 2d. It is formed only on the outer peripheral surface of the shafts 2b and 2c on the core 2a side. Since the insulating coating formed on the inner surface of each slot 2d has a uniform thickness, the rotational balance of the work 2 incorporated as an armature of a motor is remarkably improved.

When the cooled work 2 reaches a predetermined position in the circulating movement path in the second cooling tower 18 by the chain 182, the work 2 is moved from the second cooling tower 18 to the jig removing section 19 by the second traverser 26.
Further, the jig is transferred from the jig removing section 19 to the out conveyor 27. The second traverser 26 has a configuration similar to that of the first traverser 24 described above, that is, a head for transferring the work 2 to the jig removing section 19 and an out conveyor from the jig removing section 19. The head transferred to 27 carries out a transfer operation integrally (not shown).

The jig removing section 19 is structurally the same as the jig mounting section 13 described above, and as shown in FIG. 17, transfers the work 2 transported by the second traverser 26 to the work 2. A pair of V-block-shaped stations 191 for receiving and supporting the masking jigs 3 on both sides of the core 2a,
It includes a pair of chuck heads 192 for pulling out the masking jig 3 from the rotating shafts 2b and 2c of the work 2, and a pair of linear ball guide members 193 for guiding the movement of the masking jig 3 in the pulling-out direction.

That is, when the work 2 is transferred from one side of the second traverser 26 to the station 191 of the jig removing section 19 from the second cooling tower 18 side, the masking jig projecting to both sides of this station 191 3 and the work 2
From the rotating shafts 2b and 2c. The work 2 from which the masking jig 3 has been removed is transferred to the base end of the out conveyor 27 by the other head of the second traverser 26,
At the same time, the next work 2 on which the masking jig 3 is mounted is transferred onto the station 191 by the one head by the transport operation at this time. In this way,
The transfer of the work 2 and the removal of the masking jig 3 are sequentially performed.

Work 2 from which masking jig 3 has been removed
Is the out conveyor 27 of the work discharge section (see FIGS. 1 and 1).
8) is transferred to the next step. Instead of the out conveyor 27, a shooter including a pair of inclined rails may be used, and the work 2 may go down while rolling on the shooter.

The masking jig 3 pulled out of the work 2 in the jig removing section 19 is returned to the jig mounting section 13 by the jig returning section 20, and is reused. As shown in FIG. 18, the jig returning section 20 is perpendicular to the linear ball guide member 193 of the jig removing section 19 and the linear ball guide member 133 of the jig mounting section 13, in other words, the second transport screw 25. And a pair of return conveyors 201 (only one return conveyor is shown in the figure) arranged in parallel with the
1 and guide rails 202 arranged in parallel with each other
And reciprocating 90 ° around a vertical axis located at the intersection P ₁ of the center line of the linear ball guide member 193 of the jig removing section 19 and the center line of the guide rail 202, and the outside of the linear ball guide member 193. An intersection P between the center line of the linear ball guide member 133 of the jig mounting unit 13 and the center line of the guide rail 202, and the sending-side swivel rail 203 alternately contacting the end 193a and the one end 202a of the guide rail 202. The outer end 133a of the linear ball guide member 133 is reciprocated by 90 ° around the vertical axis located at the position _2.
And a receiving-side swing rail 204 alternately in contact with the other end 202b of the guide rail 202.

That is, first, one end portion 203a of the sending-side revolving rail 203 of the jig returning portion 20 comes into contact with the outer end portion 193a of the linear ball guide member 193 of the jig removing portion 19 to form a linearly continuous moving path. Forming, Work 2
The masking jigs 3 on both sides pulled out from the rotating shafts 2b and 2c are respectively moved from the linear ball guide member 193 to the delivery-side turning rail 203 by the chuck head 192 (see FIG. 17). Is moved with the flange 3c on the non-mounting side with respect to the top. Next, the delivery-side turning rail 203 turns by 90 °, and the one end portion 203a is brought into contact with the one end portion 202a of the guide rail 202 of the return conveyor 201 to form a moving path linearly continuous with the guide rail 202. I do. At this time, the masking jig 3 whose direction has been changed by the sending-side swivel rail 203 has the flange 3b on the mounting side with respect to the workpiece 2 facing the guide rail 202, and is pushed out onto the return conveyor 201 by the chuck head 192.

The masking jig 3 pushed out onto the return conveyor 201 is driven by the drive of the return conveyor 201 so that the flange 3b on the mounting side is first and the guide jig 202 guides the other end 202b. Be moved. At this time, one end 204a of the receiving-side turning rail 204 is in contact with the other end 202b of the guide rail 202 to form a linearly continuous moving path, and the masking jig 3 Accepted to. Next, the receiving-side swivel rail 204 is swiveled by 90 °, and the other end portion 204b facing the extension direction of the guide rail 202 is brought into contact with the outer end portion 133a of the linear ball guide member 133 of the jig mounting portion 13. The linear ball guide member 133 forms a moving path that is linearly continuous. At this time, the masking jig 3 whose direction has been changed by the receiving side swivel rail 204 has the flange 3b on the mounting side with respect to the work 2 facing the jig mounting section 13, in other words, the direction of insertion into the work 2, and the first traverser. 24 waits until the mounting timing at which the work 2 is transferred to the station 131 of the jig mounting unit 13.

A series of return operations from the removal of the masking jig 3 from the work 2 by the jig removing unit 19 to the mounting of the masking jig 3 on the work 2 by the jig mounting unit 13 are performed in synchronization on both sides. Will be

The present invention is not to be construed as being limited to the illustrated embodiment. For example, various changes can be made to the structure of the screw, chain, or other details constituting the work transfer path . In the illustrated embodiment, the work supply unit includes the in-conveyor 2 and the work discharge unit includes the out-conveyor 27. However, the form of supply / discharge is not particularly limited.

[0049]

According to the electrostatic powder coating apparatus according to the present invention, the following effects are realized. (1) Partial coating film formation on the work surface by electrostatic powder coating can be performed uniformly. (2) Convey the powder paint electrostatic adhesion part by the work conveyance path
During the process, the workpiece rotates on its axis, forming a uniform coating.
And improve product quality.

[Brief description of the drawings]

FIG. 1 schematically shows an overall configuration of an electrostatic powder coating apparatus according to a preferred embodiment of the present invention, wherein (A) is a plan view and (B) is a front view.

FIG. 2 is a perspective view showing a work to be painted by the apparatus of the embodiment.

FIG. 3 is an explanatory diagram showing a part of an in-conveyor, a pickup handler, and a first transport screw in the apparatus of the embodiment.

FIG. 4 is a plan view showing a part of the first transport screw.

FIG. 5 is an explanatory view showing a heating degreasing section in the apparatus of the embodiment.

FIG. 6 is an explanatory view partially showing the inside of a first cooling tower in the apparatus of the embodiment.

FIG. 7 is an explanatory diagram showing a first traverser in the apparatus of the embodiment.

FIG. 8 is an explanatory view showing a jig mounting section and a masking jig mounted on a work by the jig mounting section in the apparatus of the embodiment.

FIG. 9 is an explanatory view showing a second transfer screw in the apparatus of the embodiment.

FIG. 10 is an explanatory view showing a state of work transfer by the second transfer screw.

FIG. 11 is an explanatory view showing a powder paint electrostatic adhesion portion in the apparatus of the embodiment.

FIG. 12 is an explanatory diagram showing a state of powder paint adhesion on a work surface by the powder paint electrostatic adhesion part.

FIG. 13 is an explanatory diagram showing a workpiece outer peripheral cleaner in the apparatus of the embodiment.

FIG. 14 is an explanatory view showing a jig cleaner in the apparatus of the embodiment.

FIG. 15 is an explanatory view showing a curing unit in the apparatus of the embodiment.

FIG. 16 is an explanatory view partially showing the inside of the second cooling tower in the apparatus of the embodiment.

FIG. 17 is an explanatory view showing a jig removing unit in the apparatus of the embodiment.

FIG. 18 is an explanatory diagram showing a jig returning section in the apparatus of the embodiment, together with a jig removing section and a jig mounting section.

[Explanation of symbols]

 2 Work 3 Masking jig 4 Powder paint 11 Heat degreasing unit 13 Jig mounting unit 14 Powder paint electrostatic adhesion unit 17 Curing unit 19 Jig removal unit 20 Jig return unit 21 In conveyor 22 Pickup handler (Work transport) Path) 23 first transfer screw (work transfer path) 24 first traverser (work transfer path) 25 second transfer screw (work transfer path) 252 guide member (rotation applying section) 26 second traverser (work transfer path) 27 out Conveyor

Claims (1)

(57) [Claims] 1. An electrostatically adhering portion for charging an air-laid powder coating material and electrostatically adhering the powder coating material to a surface of the work, and heating and melting and fixing the powder coating layer electrostatically adhered to the surface of the work. A curing section to be carried out; a work transport path for continuously transporting the work in a non-intermittent state via the powder paint electrostatic adhesion section and the curing section sequentially; For unpainted parts of work
A jig for mounting a masking jig having a convex part at the outer end axis
And a mounting section, wherein the work transfer path is mounted on a non-painting section of a center axis of the work.
Supports the work via the worn masking jig
It consists of a feed mechanism with a pair of transfer screws,
The screw displaces in the direction perpendicular to the transport direction.
Contact with the convex part of the masking jig
Apply a rotational force to the work via the masking jig
An electrostatic powder coating device comprising a guide member .