JP5828312B2 - Impregnation coating apparatus and impregnation coating method - Google Patents

Description

  The present invention relates to an impregnation coating apparatus and an impregnation coating method for impregnating and coating a workpiece with a coating liquid.

2. Description of the Related Art Conventionally, an apparatus for applying a coating liquid to the surface of a workpiece is known.
For example, Patent Document 1 discloses a liquid application device that rotates an impregnated body impregnated with a liquid around the work while contacting the work surface to apply the liquid to the work surface.

JP 2004-255300 A

  In the apparatus of Patent Document 1, the liquid can be applied only to the surface in contact with the impregnated body. In addition to this, there is also known an apparatus for spreading the dropped coating liquid on the surface by centrifugal force, but when any apparatus is applied to a workpiece having an uneven shape part, a wide range including a recessed part located behind the surface is included. It is difficult to impregnate and apply the coating solution evenly.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an impregnation coating apparatus that uniformly impregnates and applies a coating liquid to the uneven shape portion of a workpiece.

The present invention is an impregnation coating apparatus for impregnating and coating a coating liquid on a concavo-convex shape portion of a workpiece, and includes a nozzle head, a coating liquid supply unit, a moving unit, a workpiece receiver, and a rotating unit.
The nozzle head is composed of an inner member and an outer member, and applies the coating liquid to the workpiece while the workpiece is accommodated in the accommodation chamber. The inner member includes a plurality of discharge holes that form a storage chamber that conforms to the outer shape of the concavo-convex shape portion of the workpiece on the inner side of the cylindrical wall and penetrate the cylindrical wall in the radial direction. The outer material covers the outer side of the inner member and forms a coating liquid passage between the outer member and the inner member.
The moving means moves the nozzle head so as to approach or separate from the workpiece.
The rotating means rotates the work receiver with respect to the nozzle head.

Since the storage chamber formed in the inner member of the nozzle head conforms to the outer shape of the concave and convex portion of the workpiece, the coating liquid discharged from the coating liquid passage through the plurality of discharge holes faces the discharge holes. It is stably applied to the site.
For example, it is preferable that the workpiece has a substantially rotating body shape having a rotation axis coaxial with the storage chamber, and the plurality of discharge holes are evenly arranged in the circumferential direction. In this case, the work with the coating liquid attached is rotated by the rotating means together with the workpiece holder, so that the coating liquid is evenly distributed in the circumferential direction and applied to recesses such as holes, grooves, and gaps located deeper than the surface. The liquid can be poured. Further, by providing a plurality of discharge holes in the axial direction at a plurality of locations, the coating liquid adhering to an axial range having a certain width can be leveled in the circumferential direction and the coating liquid can be poured into a wide range of recesses. Therefore, it is possible to uniformly impregnate and apply the coating liquid over a wide range including not only the surface of the workpiece but also the uneven portion.

Here, the “concavo-convex shape portion” of the workpiece means a portion having an uneven shape in at least a part of the impregnation application range. That is, you may include the part of a flat surface other than an uneven | corrugated | grooved part. In addition, the concavo-convex shape portion is not limited to a visible portion, and includes a porous body having a fine cavity inside.
For example, in a member in which a coil is wound around a core such as an armature such as a motor, it is considered that a coil wire forms a convex portion and a gap generated between the wires forms a concave portion. In this case, the coating liquid can be spread to the recesses between the coil wires by the impregnation coating apparatus of the present invention.

The present invention is also provided as an impregnation coating method in which the coating liquid is impregnated and applied to the concavo-convex shape portion of the workpiece using the above-described impregnation coating apparatus.
This impregnation coating method includes the following steps.
(A) an approach stage in which the nozzle head is moved closer to the workpiece by the moving means and the workpiece is accommodated in the accommodation chamber of the nozzle head;
(B) A coating stage in which the coating liquid supplied from the coating liquid supply means to the nozzle head is applied to the workpiece from the discharge hole via the coating liquid passage;
(C) a rotation stage in which the coating liquid is adjusted in the circumferential direction of the workpiece and rotates the workpiece so as to flow into the recess;
(D) A separation step in which the nozzle head is relatively separated from the workpiece by the moving means after the application is completed.
Here, the application step and the rotation step may shift to the rotation step after the application step is completed, or may include a step of rotating simultaneously with the application.

It is a schematic diagram of the impregnation coating apparatus by one Embodiment of this invention. It is sectional drawing of the nozzle head of the impregnation coating apparatus by one Embodiment of this invention. It is a front view of the armature which is the workpiece | work by one Embodiment of this invention. FIG. 4 is a view (plan view) taken in the direction of arrows IV in FIG. 3. It is a schematic diagram which shows the descent | fall stage of the impregnation coating method by one Embodiment of this invention. It is a schematic diagram which shows the application | coating step same as the above. It is a schematic diagram which shows a positive direction rotation step same as the above. It is a schematic diagram which shows a reverse rotation stage same as the above. It is a schematic diagram which shows an air blow step same as the above. It is a schematic diagram which shows a rising stage same as the above. It is a schematic diagram (partially cutaway sectional view) of a workpiece applicable to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(One embodiment)
An impregnation coating apparatus according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, an impregnation coating apparatus 100 is an apparatus for impregnating and coating a coating liquid on the uneven portions 92 and 93 of a workpiece 90 having a substantially rotating body shape. In this embodiment, the vertical direction in FIG. It is configured as a vertical device oriented. The impregnation coating apparatus 100 mainly includes a nozzle head 10, a syringe 4 as “application liquid supply means”, an elevating means 5 as a “moving means”, a work receiver 6, and a rotating means 7.

  The nozzle head 10 forms an accommodating chamber 16 for accommodating the workpiece 90 inside, and also forms a passage for the coating liquid 8 to be applied to the workpiece 90. Further, in the present embodiment, an air blowing means 30 capable of blowing air to the workpiece 90 is integrally provided at the lower part of the nozzle head 10. The detailed configuration of the nozzle head 10 will be described later.

The syringe 4 quantifies the amount of the coating liquid 8 corresponding to one workpiece 90 and supplies it to the nozzle head 10 via the supply port 81.
The lifting / lowering means 5 moves the nozzle head 10 so as to approach or separate from the workpiece 90 relatively.

The workpiece receiver 6 supports the center of gravity of the workpiece 90 by fitting a shaft 98 which is a shaft portion of the workpiece 90 into a receiving hole 61 coaxial with the central axis O of the workpiece 90. In addition, the workpiece 90 and the workpiece receiver 6 are connected by a rotation positioning pin 62 at a position different from the central axis O. A receiving tray 65 that receives the coating liquid 8 that hangs down from the nozzle head 10 and the workpiece 90 is provided outside the diameter of the workpiece receiver 6.
The rotating means 7 is driven by the power of a motor or the like, and rotates the workpiece receiver 6 about the central axis O. Thereby, the workpiece 90 rotates integrally with the workpiece receiver 6. In particular, in the present embodiment, the rotation means 7 can rotate in the forward and reverse directions.

  Next, a detailed configuration of the nozzle head 10 will be described with reference to FIG. As shown in FIG. 2, the nozzle head 10 mainly includes an inner member 11, an outer member 21, and an upper plate 31 and a lower plate 32 of the air blowing means 30.

When the inner member 11 and the outer member 21 are combined, they form a double bell shape.
The inner member 11 has a fitting part 12, an inner cylinder part 13, and a flange part 14. The fitting portion 12 is fitted to the fitting portion 26 of the outer member 21 with the sealing materials 171 and 172 inserted into the outer wall. An air hole 15 communicating with the storage chamber 16 is formed inside the fitting portion 12.

The inner cylinder part 13 forms a storage chamber 16 that conforms to the outer shape of the concavo-convex shape parts 92 and 93 of the workpiece 90 inside the cylinder wall. A plurality of discharge holes 85 penetrating the cylinder wall in the radial direction are formed in the lower part of the inner cylinder part 13. The discharge holes 85 of the present embodiment include three types of first discharge holes 851 that are substantially horizontal, second discharge holes 852 that are inclined downward toward the central axis O, and third discharge holes 853 in order from the upper side in the axial direction. Is included. In addition, a plurality of discharge holes 851, 852, 853 are arranged in the circumferential direction, and preferably, the discharge holes 85 are arranged at equal intervals.
The flange portion 14 is fastened to the flange portion 24 of the outer member 21 by bolts 28 in a state where the sealing material 18 is inserted between the flange portion 14 and the flange portion 24 of the outer member 21.

The external member 21 has a small diameter part 22, an outer cylinder part 23, and a flange part 24. A connection portion 25 connected to the syringe 4 is provided on the upper end surface of the small diameter portion 22. A supply port 81 for the coating liquid 8 is formed on the inner wall of the connection portion 25, and an introduction path 82 having a diameter larger than that of the supply port 81 is formed below the supply port 81. In addition, a plurality of introduction paths 83 that communicate the introduction path 82 and the coating liquid path 84 in the axial direction are formed in the circumferential direction.
A fitting hole 26 is formed along the central axis O on the lower side of the introduction path 82.

When the fitting portion 12 of the inner member 11 is fitted into the outer member 21 fitting hole 26 and the flange portion 14 of the inner member 11 and the flange portion 24 of the outer member 21 are fastened, the inner member 11 is The outer member 21 is assembled coaxially. Therefore, a coaxial annular coating liquid passage 84 is formed between the outer wall of the inner cylinder part 13 and the inner wall of the outer cylinder part 23.
With the above configuration, the coating liquid 8 supplied from the syringe 4 can be discharged from the plurality of discharge holes 85 on average through the supply port 81 via the introduction paths 82 and 83 and the coating liquid path 84.
A coupler 29 is connected to the pipe screw 221 formed in the small diameter portion 22 of the outer member 21 so that air can be supplied from the coupler 29 through the air hole 15 to the accommodation chamber 16.

  In the air blowing means 30, an annular upper plate 31 and a lower plate 32 are fastened by bolts 37, and the upper plate 31 is attached to the flange portion 24 of the outer member 21 by bolts 38. Air is supplied to the annular passage 312 through the coupler 39 connected to the pipe screw 311. A plurality of air grooves 33 communicating with the annular passage 312 and the internal space 34 are formed in the contact surface between the upper plate 31 and the lower plate 32 in the circumferential direction.

  Subsequently, a specific example of the workpiece 90 applied to the impregnation coating apparatus 100 of the present embodiment will be described with reference to FIGS. 3 and 4. The workpiece 90 illustrated in FIGS. 3 and 4 is a motor armature, and is hereinafter referred to as an “armature 90”. In the armature 90, a coil 91 is wound around a core 95 around a shaft 98. Of the coil 91 exposed to the outside, the portion located above the core 95 has a stepped appearance, and the upper side of the step is generally referred to as the upper surface portion 92 and the outer side of the step is referred to as the side surface portion 93. The upper surface portion 92 and the side surface portion 93 correspond to an “uneven shape portion” that is a target portion for impregnation application. A portion exposed below the core 95 is referred to as a lower winding portion 94.

The coil upper surface portion 92 is connected to a commutator 96 and is held by a bind ring 97 so as not to spread outward. The coil side surface portion 93 is wired so as to incline upward while proceeding clockwise from the outer peripheral side close to the core end surface 951 toward the inner peripheral upper surface portion 92. Although not shown in FIGS. 3 and 4, a coil wound in the back is actually visible between the coil wires.
In this armature 90, a coating liquid 8 such as an insulating adhesive is applied to the coil upper surface portion 92 and the side surface portion 93 in the range from the axial bind ring 97 to the core end surface 951.

As described above, the armature 90 does not have constant external angles of the upper surface portion 92 and the side surface portion 93, and the surface has an uneven shape by one line, so the coating liquid 8 is simply sprayed from the outside. Then, it is difficult to obtain a uniform coating finish. For this reason, it is necessary to rely on the manual work of the operator, and the number of work steps increases.
In view of this, the impregnation coating apparatus 100 of the present embodiment is intended to uniformly impregnate and apply the coating liquid 8 onto a workpiece having the uneven portions 92 and 93 like the armature 90.

Next, an impregnation coating method using the impregnation coating apparatus 100 will be described with reference to FIGS. As shown in FIG. 5, the armature 90 is connected to the workpiece receiver 6 by the rotation positioning pin 62 and the shaft 98 is fitted into the receiving hole 61, so that the workpiece receiver 6 is arranged on the central axis O coaxial with the nozzle head 10. Set to
<Descent stage (approach stage)>
From this set state, the lifting / lowering means 5 lowers the nozzle head 10 so as to approach the armature 90.

<Coating stage>
As shown in FIG. 6, when the nozzle head 10 is lowered, the coil upper surface portion 92 and the side surface portion 93 of the armature 90 fit well with the inner surface shape of the lower portion of the storage chamber 16. In particular, the portion where the second discharge hole 852 and the third discharge hole 853 face each other is in a state where there is almost no gap between it and the storage chamber 16. On the other hand, a certain amount of gap is formed at the part where the first discharge hole 851 faces.
In such a state, the coating liquid 8 pressurized from the syringe 4 is discharged from the discharge hole 85 and adheres to the surfaces of the coil upper surface portion 92 and the side surface portion 93. When a predetermined amount of the coating liquid 8 is discharged, the liquid pressure in the coating liquid passage 84 is balanced with the internal pressure of the storage chamber 16, and the discharge from the discharge hole 85 is stopped.

<Normal rotation stage>
First, as shown in FIG. 4, clockwise rotation when the armature 90 is viewed from above is defined as “forward rotation”, and counterclockwise rotation is defined as “reverse rotation”. 7 to 10, the armature after the coating liquid 8 is applied is distinguished from the “armature 90 before application” and is indicated as “armature 99 after application”.
After completion of the coating step, as shown in FIG. 7, the armature 99 is rotated forward together with the workpiece receiver 6 by the rotating means 7. Then, in particular, the coating liquid 8 that has been unevenly adhered to the surface of the coil side surface portion 93 flows into the core end surface 951 side along the space between the coil wires as indicated by the solid line arrow f1. Moreover, since the impregnation coating apparatus 100 is a vertical type in this embodiment, the action of gravity is also added at this time, and the coating liquid 8 is dropped to the core end surface 951 side.

<Reversal stage>
Subsequently, as shown in FIG. 8, the armature 99 is reversed together with the work receiver 6 by the rotating means 7. Then, in particular, the coating liquid 8 that was unevenly adhered to the surface of the coil side surface portion 93 was made uniform by a slight gap with the storage chamber 16, and the operator just seemed to “shave” manually. A perfect finish is obtained. Further, as indicated by the broken line arrow f2, the coating liquid 8 is impregnated from the surface to the back.

In the forward rotation stage and the reverse rotation stage, the nozzle head 10 is preferably raised slightly away from the armature 99 in order to avoid the side surface portion 93 from coming into contact with the storage chamber 16 during rotation. At this time, it is easy to separate the inner member 11 from the armature 99 by supplying air from the coupler 29 to the housing chamber 16.
The rotation speed and the rotation time are preferably adjusted by characteristics such as the size and shape of the armature 99 and the viscosity of the coating liquid 8. Further, forward rotation and reverse rotation may be alternately repeated several times.

<Air blow stage>
Thereafter, in the present embodiment, an air blowing stage is executed. As shown in FIG. 9, at this time, the coil upper surface portion 92 and the side surface portion 93 are in a state where the coating liquid 8 is uniformly applied. Therefore, air is supplied to the air blowing means 30 and air is blown from the air groove 33 to the side surface of the upper portion of the core 95. Thereby, dripping of the coating liquid 8 on the side surface of the core 95 can be prevented, and the excess coating liquid 8 can be pushed inwardly in the radial direction of the side surface portion 93.

<Rising stage (separation stage)>
Finally, as shown in FIG. 10, the lifting / lowering means 5 lifts the nozzle head 10 away from the armature 99. At this time, the nozzle head 10 may be raised while rotating the armature 99 in order to prevent stringing of the coating liquid 8.

As described above, according to the impregnation coating apparatus 100 of the present embodiment, since the storage chamber 16 formed in the inner member 11 of the nozzle head 10 is adapted to the outer shape of the upper surface portion 92 and the side surface portion 93 of the armature 90, The coating liquid 8 ejected from the coating liquid passage 84 via the plurality of ejection holes 85 is stably applied to the part facing the ejection holes 85.
Then, the rotating means 7 rotates the armature 90 so that the coating liquid 8 is made uniform in the circumferential direction and the coating liquid 8 can be poured into the recesses between the coil wires. In addition, since the first to third discharge holes 851, 852, 853 are provided in the axial direction, the coating liquid 8 adhering to an axial range of a certain width is formed in a belt shape in the circumferential direction and applied to a wide range of recesses. The liquid can be poured. Therefore, the coating liquid 8 can be uniformly impregnated and applied over a wide range including not only the surfaces of the upper surface portion 92 and the side surface portion 93 but also the recesses between the coil wires.

In addition, since the nozzle head 10 is integrally provided with the air blowing means 30, air is blown to a fixed position of the armature 90 after the impregnation coating, and effects such as prevention of dripping of the coating liquid 8 and pushing of the extra coating liquid 8 are performed. Can be obtained.
Furthermore, since the coil 91 of the armature 90 is wound so as to be inclined in one direction, the flow of the coating liquid 8 attached to the surface differs depending on the direction in which the armature 90 is rotated. Therefore, by making the rotating means 7 rotatable in the forward and reverse directions, it is possible to make use of different effects such as “flowing between lines”, “surface smoothing” and the like.

(Other embodiments)
(A) When the uneven shape of the workpiece is not different depending on the forward and reverse rotation directions, a rotation means that rotates only in one direction may be used, and an impregnation coating method including a rotation direction in one direction may be employed.
In addition, as in the above-described embodiment, the process may include a step of rotating simultaneously with the application instead of shifting to the rotation stage after the application stage is completed.

  (A) The air blowing means may be provided independently of the nozzle head. In the case where dripping of the coating solution does not become a problem, an impregnation coating method that does not include an air blowing step without providing an air blowing means in the nozzle head may be employed.

  (C) The elevating means as the “moving means” is not limited to moving the nozzle head relative to the work whose height position is fixed, but moves the work relative to the nozzle head whose height position is fixed. It may be a thing. Or you may move both a nozzle head and a workpiece | work.

  (D) The impregnation coating apparatus is not limited to the “vertical type” in which the moving means moves the nozzle head relative to the work, but the moving means moves the nozzle head relatively close to the work in the horizontal direction. You may comprise the "horizontal type" which makes it space apart. In the case of the horizontal type, it is preferable that the workpiece receiver has a shape that can stably hold the side surface of the workpiece.

(E) As a workpiece to which the impregnation coating apparatus and the impregnation coating method of the present invention are effectively applied, a workpiece having a shape as shown in FIG. 11 can be considered in addition to the armature of the above embodiment. A workpiece 901 shown in (a) has a protrusion and a depression on the surface. The workpiece 902 shown in (b) is a so-called porous body having cavities on the surface and inside. A workpiece 903 shown in (c) has a three-dimensional mesh shape, and a gap between the lines continues to the back. If the impregnation coating apparatus and the impregnation coating method of the present invention are used, the coating liquid can be uniformly impregnated and applied to the concave portions of the workpiece.
As mentioned above, this invention is not limited to such embodiment, In the range which does not deviate from the meaning of invention, it can implement with a various form.

100 ... impregnation coating apparatus,
10 ... Nozzle head,
11 ... Inner member, 16 ... Storage chamber, 21 ... Outer member,
4 ... Syringe (application liquid supply means),
5 ... Lifting means (moving means),
6 ・ ・ ・ Work receiving,
7 ・ ・ ・ Rotating means,
8 ... coating liquid, 84 ... coating liquid passage, 85 ... discharge hole,
90 ... armature (work),
92 ... upper surface part (uneven shape part), 93 ... side part (uneven shape part),
99 ... Armature (work) (after application).

Claims (8)

An impregnation coating apparatus (100) for impregnating and applying the coating liquid (8) to the uneven portions (92, 93) of the workpiece (90),
An inner member (11) having a plurality of discharge holes (85) formed radially inside the cylindrical wall and having a storage chamber (16) adapted to the outer shape of the concave and convex portion of the workpiece; And it is comprised from the outer member (21) which covers the outer side of the said inner member, and forms a coating liquid channel | path (84) between the said inner members, The coating liquid is applied to the said work in the state accommodated in the said storage chamber A nozzle head (10) for applying
A coating liquid supply means (4) for supplying a coating liquid to the nozzle head;
Moving means (5) for moving the nozzle head so as to approach or separate from the workpiece;
A workpiece receiver (6) for supporting the workpiece;
A rotating means (7) for rotating the workpiece receiver relative to the nozzle head;
An impregnation coating apparatus comprising:   The impregnation coating apparatus according to claim 1, further comprising an air blowing means (30) provided integrally with the nozzle head and capable of blowing air onto the workpiece.   The impregnation coating apparatus according to claim 1 or 2, wherein the rotating means is rotatable in forward and reverse directions. The workpiece is an armature having a coil wound around a core,
The impregnation coating apparatus according to any one of claims 1 to 3, wherein the coating liquid is impregnated and applied to a coating portion including a space between the exposed lines of the coil. An impregnation coating method using the impregnation coating apparatus according to claim 1 for impregnating and coating a coating liquid on an uneven shape portion of a workpiece,
An approaching step of relatively moving the nozzle head closer to the work by the moving means, and housing the work in the housing chamber of the nozzle head;
An application step of applying the application liquid supplied from the application liquid supply means to the nozzle head from the discharge hole to the workpiece via the application liquid passage;
A rotation step of rotating the workpiece so that the coating liquid is smoothed in the circumferential direction of the workpiece and flows into the recess by rotating the workpiece receiver by the rotating means;
A separation step of relatively separating the nozzle head from the workpiece by the moving means after the application is completed;
The impregnation coating method characterized by including.   6. The impregnation coating method according to claim 5, further comprising an air blowing step of blowing air to the workpiece on which the coating liquid has been applied.   The impregnation coating method according to claim 5 or 6, wherein the rotation step includes a forward rotation step of rotating the workpiece in the forward direction and a reverse rotation step of rotating in the reverse direction. The workpiece is an armature having a coil wound around a core,
The impregnation coating method according to any one of claims 5 to 7, wherein a coating liquid is impregnated and applied to a coating portion including a space between exposed wires of the coil.

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