JPH0125304B2 - - Google Patents

Description

Detailed Description of the Invention A. Purpose of the Invention (1) Industrial Field of Application The present invention is directed to a rotor of a self-excited generator used as a portable engine generator, which is fitted onto the rotor shaft. The present invention relates to a magnetic powder application device for automatically applying magnetic powder to the outer peripheral surface of a magnetic pole portion of a field core.

(2) Prior art The present applicant first applied the following method to the outer peripheral surface of the magnetic pole part of the field core.
We have proposed a rotor in which magnetic particles are applied and fixed using a binder to form a thin layer of magnetic particles, thereby obtaining extremely stable residual magnetism and improving the initial output voltage rise characteristics of the generator.

In this case, since there is only a gap of about 0.3 to 0.5 mm between the magnetic pole part and the air gap part facing it, the magnetic powder layer must be formed extremely thin to a thickness of about 0.05 to 0.1 mm. Conventionally, the application work was done manually, such as by brush painting.

(3) Problems to be Solved by the Invention If the magnetic powder coating work was performed manually as in the past, not only was the work efficiency poor, but it was also difficult to always form a magnetic powder layer with a uniform thickness. , quality tends to be unstable.

In view of the above, the present invention provides a magnetic powder coating device that automatically performs magnetic powder coating on the outer circumferential surface of a magnetic pole part, thereby improving coating efficiency and always making the thickness of the magnetic powder layer uniform and stabilizing the quality. The purpose is to

B. Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a method for applying magnetic powder imparted with adhesiveness by a binder to the outer peripheral surface of a plurality of magnetic pole parts of a field core. The magnetic powder coating device comprises a machine body and a plurality of screens, which are supported by the machine body so as to be able to reciprocate in the front-rear direction thereof and each have substantially the same shape as the developed shape of the outer circumferential surface of the plurality of magnetic pole parts. stencils arranged in parallel in the longitudinal direction of the fuselage at intervals equal to the circumferential distance between the outer circumferential surfaces of the stencils, a stencil drive device for reciprocating the stencils in the longitudinal direction of the fuselage, and a magnetic field core located below the stencils. a support stand rotatably provided with a support shaft perpendicular to the longitudinal direction of the fuselage and parallel to the screen, capable of supporting concentrically; a support stand drive device for driving the support stand so that it can take an operating position where the surface can be close to the stencil and a non-operation position where the surface thereof is spaced apart from the stencil; and an interlocking mechanism that interlocks and rotates a support shaft, and the stencil is placed in a predetermined coating operation position facing and close to the support base with the stencil in between, and is pressed against the outer circumferential surface of the magnetic pole part through a screen. a squeegee capable of applying the magnetic particles on the screen to the outer peripheral surface of the magnetic pole part; and a squeegee drive device for driving the squeegee so that it can take the application operation position and a non-operation position spaced apart from the stencil. The interlocking mechanism is provided with a rack disposed so as to be movable integrally with the stencil and extending in the longitudinal direction of the aircraft body, and supported on the support base so as to mesh with the rack when the support base is in the operating position. and a pinion that rotates in conjunction with the support shaft.

(2) Operation According to the above configuration, after setting the field core on the spindle at the non-operating position of the support, the support is moved to the operating position, the squeegee is moved to the coating operation position, and then the stencil is applied. When it is moved forward, the outer circumferential surfaces of the plurality of magnetic pole parts of the field core on the spindle that rotates in conjunction with the advancement sequentially face the plurality of corresponding screens, and at the time of each facing, the outer circumferential surface of each magnetic pole part is pressed by a squeegee. Since the portion in pressure contact with the screen moves continuously, the squeegee pushes out the magnetic powder previously applied onto each screen onto the outer circumferential surface of the corresponding magnetic pole part, and applies the magnetic powder to a uniform thickness.

(3) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a machine body, and a feed screw 3 that is rotationally driven by a reversible motor 2 is supported horizontally on the machine body 1. Above the feed screw 3, a pair of guide rails 4 (only one shown in the figure) is installed on the machine body 1 in parallel with the feed screw 3, and a stencil support frame 5 is slidably supported on the guide rails 4. Further, a female threaded portion 6 on the lower surface of the stencil support frame 5 is screwed into the feed screw 3. As a result, when the reversible motor 2 rotates in the normal direction, the feed screw 3 rotates and the stencil support frame 5 moves forward (moves to the right), and when the reversible motor 2 rotates in the reverse direction, the feed screw 3 rotates in the opposite direction to the stencil support frame 5. The support frame 5 moves backward (moves to the left). Therefore, the reversible motor 2, the feed screw 3, and the female screw portion 6
is a stencil drive device that cooperates with each other to reciprocate the stencil 7 in the longitudinal direction of the machine body 1.
It constitutes D ₁ .

The stencil 7 consists of a frame part 8 and a screen part 9 tensioned therein, and the stencil 7 is fitted into the stencil support frame 5 and fixed with several thumbscrews 10. As shown in FIG. 3, the screen portion 9 has a diameter that is approximately the same as the developed shape of the convex arcuate outer peripheral surfaces of the first and second magnetic pole portions P ₁ and P ₂ of the field core C (in the illustrated example, it has a diameter that is larger than the developed shape). A pair of front and rear first and second screens 9 ₁ that form a slightly smaller similar shape,
9 ₂ is left by masking 11 the other parts, and the distance between the two screens 9 ₁ and 9 ₂ in the longitudinal direction is equal to the distance in the circumferential direction between the outer peripheral surfaces of the two magnetic pole parts P ₁ and P ₂ is set equal to First,
The mesh size of the second screens 9 ₁ and 9 ₂ is determined by the thickness of the magnetic powder coating.

Above the front part of the stencil 7, a sub-hydraulic cylinder 14 is fixed to a support plate 13 that is raised and lowered by a main hydraulic cylinder 12 fixed to the body 1. A bracket 16 hanging from the cylinder body 15 of the auxiliary hydraulic cylinder 14 is provided with a squeegee 17 made of rubber or the like on the front side, and a replenishment blade 18 made of rubber or the like on the rear side so as to be slidable in the vertical direction.
Their upper ends are respectively pivotally connected to both ends of a connecting arm 19 which is pivotally connected to the bracket 16. The piston rod 2 of the auxiliary hydraulic cylinder 14 is attached to the squeegee 17.
When the piston rod 20 is extended, the squeegee 17 is lowered and the replenishment blade 18 is raised; on the other hand, when the piston rod 20 is retracted, the squeegee 17 is raised and the replenishment blade 18 is
descends. The tip of squeegee 17 is stencil 7
When the stencil 7 is at the backward end (left moving end), the second screen 9 is located near the front edge of the _first screen 91, and when the stencil 7 is at the forward end (right moving end), the second screen 9
It is set to be located near the rear edge of _{No. 2} .
The main hydraulic cylinder 12, the support plate 13, and the auxiliary hydraulic cylinder 14 cooperate with each other to push the squeegee 17.
A squeegee drive device D ₃ is configured to drive the squeegee so that it can take a coating operation position (lowest limit) opposite to and close to the stencil 7 and a non-operation position spaced apart above the stencil 7.

A hydraulic cylinder 21 for raising and lowering the field core is fixed to the body 1 below the front of the stencil 7, and a support base 22 is attached to the tip of a piston rod 25 of the cylinder 21. A support shaft 23 is rotatably attached to the support base 22 in a relationship perpendicular to the feed screw 3 and parallel to the screens 9 ₁ , 9 ₂ , and a pinion 24 is fixed to the support shaft 23 .
The pinion 24 engages with a rack 26 integral with the stencil support frame 5 when the support base 22 is raised, and is disengaged from the rack 26 when the support base 22 is lowered. Therefore, the hydraulic cylinder 21 is
The support stand 22 is connected to the magnetic pole part of the field core C on the support shaft 23.
A support stand drive device D for driving _P1 , _P2 so that the outer circumferential surface can take an operating position (raised position) close to the stencil 7 and a non-operating position (lower position) where it is distant from the stencil 7. ₂ , and the rack 26 and pinion 24 move the plurality of magnetic poles of the field core C on the support shaft 23 when the stencil 7 is advanced with the support base 22 held at the operating position, as will be described later. An interlocking mechanism In is configured to interlock and rotate the support shaft 23 on the stencil 7 so that the outer peripheral surfaces of P ₁ and P ₂ sequentially face the corresponding plurality of screens 9 ₁ and 9 ₂ .

Next, a working process for applying magnetic powder M to the outer peripheral surface of each magnetic pole portion P ₁ and P ₂ of the field core C using the magnetic powder coating apparatus of the above embodiment will be explained.

(1) As shown in FIG. 4a, the magnetic particles M are mixed with insulating varnish or thermosetting ink as a binder to give adhesiveness, and the magnetic particles M are applied to the first screen ₉₁ of the stencil 7. It is piled up in a mountain shape near the leading edge and near the trailing edge of the second screen 9 ₂ and applied to the upper surface of each screen 9 ₁ and 9 ₂ by hand or by the replenishing action of the replenishing blade 18 described later.

The field core C fits the rotor shaft fitting hole h, which is the center of rotation, to the support shaft 23, and the first magnetic pole part P ₁
is positioned at the top and the second magnetic pole part P ₂ is positioned at the bottom, and the second magnetic pole part P ₂ is positioned at the front side in the forward direction of the stencil 7 and is positioned and fixed in an inclined state. At the start of the coating process, the hydraulic cylinder 21, the field core C is in a raised position, and the edge located at the upper part of the outer peripheral surface of the first magnetic pole part _P1 is close to the front edge of the first screen ₉₁ ,
A pinion 24 also meshes with a rack 26. Further, the sub-hydraulic cylinder 14 is lowered by the main hydraulic cylinder 12, and the squeegee 17 is lowered by the sub-hydraulic cylinder 14 to the coating operation position, and the squeegee 17 presses the first screen ₉₁ to press the leading edge of the The portion is brought into close contact with the edge portion of the outer circumferential surface of the first magnetic pole portion _P1 .

(2) As shown in Fig. 4b, when the reversible motor 2 is rotated in the forward direction, the feed screw 3 rotates and the stencil 7 moves forward (moves to the right), and the pinion 24 moves clockwise as the rack 26 moves forward. Therefore, the field core C also rotates in the same direction. As a result, the magnetic powder M pushed out from the first screen 9 ₁ by the squeegee 17 is uniformly applied to the outer peripheral surface of the first magnetic pole portion P ₁ to form a magnetic powder layer L ₁ . In this case, since the area of the first screen ₉₁ is slightly smaller than the area of the outer peripheral surface of the first magnetic pole part _P1 , the applied magnetic particles M
does not hang down from the outer peripheral edge of the first magnetic pole portion _P1 .

(3) As shown in Figure 4c, further stencil 7
When the magnetic field core C moves forward, the magnetic field core C becomes more
It is rotated by 180 degrees, and one end edge of the outer peripheral surface of the second magnetic pole part _P2 is located at the front edge of the second screen ₉₂ .

(4) As shown in Figure 4d, the subsequent stencil 7
Due to the advancement of the field core C and the rotation of the field core C, the magnetic powder M pushed out from the second screen ₉₂ by the squeegee 17 is uniformly applied to the outer peripheral surface of the second magnetic pole part ₉₂ , forming a magnetic powder layer _L2 . . Thereafter, when the stencil 7 reaches its forward limit, the reversible motor 2 stops.

(5) As shown in Figure 4e, the auxiliary hydraulic cylinder 14
Retract the piston rod 20 and remove the squeegee 1.
At the same time as the blade 7 is raised, the replenishment blade 18 is lowered, and the tip of the blade M is raised into a mountain shape.
Stick it inside.

Also, the piston rod 25 of the hydraulic cylinder 21
is contracted to lower the magnetic field core C after the magnetic powder layers L ₁ and L ₂ have been formed, the field core C is removed from the support shaft 23, and a new field core C' is positioned and fixed on the support shaft 23. In this case, since the support shaft 23 has been rotated by 270 degrees from the start of the coating process (FIG. 4a), the inclination of the field core C' is in the opposite relationship to that at the start of the coating process.

(6) As shown in FIG. 4f, the piston rod 25 of the hydraulic cylinder 21 is extended to raise the field core C' and engage the pinion 24 with the rack 26.

(7) As shown in Fig. 4g, when the reversible motor 2 is reversed, the feed screw 3 rotates and the stencil 7 moves backward (operates), and the pinion 24 moves counterclockwise as the rack 26 moves backward. Rotate. As a result, the magnetic particles M are replenished by the replenishment blade 18 onto the upper surfaces of the first and second screens 9 ₁ and 9 ₂ and near the front edge of the first screen.

When the stencil 7 reaches its retraction limit, the reversible motor 2 stops, and the new field core C' rotates counterclockwise by 270 degrees to assume the same tilted state as shown in FIG. 4a. Thereafter, when the piston rod 20 is extended by the auxiliary hydraulic cylinder 14, the replenishment blade 18 rises and at the same time the squeegee 17 is inserted into the heaped-up magnetic powder M, completing preparation for the next coating process.

After applying the magnetic powder, the field core C is heated to harden both the magnetic powder layers L ₁ and L ₂ , and fix them to the outer peripheral surfaces of the first and second magnetic pole parts P ₁ and P ₂ .

In addition, the insulating varnish used as a binder is
Because it has sufficient mechanical bonding force, it is possible to firmly bond the magnetic particles to each other and between the magnetic particles and the outer circumferential surface of the magnetic pole part.It also has excellent heat resistance, so the rotor does not generate heat during power generation. However, the magnetic powder layer does not peel off, and insulating varnishes of various viscosities are commercially available, so if it is necessary to change the blending ratio to fully demonstrate the characteristics of the magnetic powder, it is necessary to change the blending ratio. There are advantages such as being able to easily select a suitable insulating varnish.

C. Effects of the Invention As described above, according to the present invention, the magnetic powder application device for applying magnetic powder to the outer circumferential surface of the plurality of magnetic pole parts of the field core can be attached to the fuselage body and reciprocated in the longitudinal direction of the fuselage body. a plurality of supported screens each having substantially the same shape as the developed shape of the outer peripheral surface of the plurality of magnetic pole parts;
stencils arranged in parallel in the longitudinal direction of the machine body at intervals equal to the circumferential spacing between the outer peripheral surfaces of the plurality of magnetic pole parts; a stencil drive device for reciprocating the stencils in the longitudinal direction of the machine body; A support base rotatably provided with a support shaft that is perpendicular to the longitudinal direction of the aircraft and parallel to the screen and capable of supporting the magnetic field core concentrically below; a support stand drive device for driving the iron core so that the outer circumferential surface of the magnetic pole portion of the iron core can take an operating position in which the outer peripheral surface of the magnetic pole part is close to the stencil and a non-operating position in which the outer circumferential surface of the magnetic pole part of the iron core is separated from the stencil; and a support stand drive device that holds the support stand in the operating position. an interlocking mechanism that interlocks and rotates a spindle with the stencil in the stencil state, and a screen on the outer circumferential surface of the magnetic pole part when the stencil is placed in a predetermined coating operation position facing and close to the support base with the stencil in between. a squeegee capable of applying magnetic particles on the screen to the outer circumferential surface of the magnetic pole part by pressure contact through the stencil; and a squeegee for driving the squeegee so that it can take the application operation position and a non-operation position spaced apart from the stencil. The interlocking mechanism includes a rack that is disposed so as to be movable integrally with the stencil and extends in the longitudinal direction of the machine body, and a rack that engages with the rack when the support base is in the operating position. Since it has a pinion that is supported by the support base and rotates in conjunction with the support shaft, the field core is supported on the support shaft, the support base is held at the operation position, and the squeegee is held at the application operation position. When the stencil is advanced in this state, the outer circumferential surfaces of the plurality of magnetic pole parts of the field core on the spindle that rotates in conjunction with the advancement can be successively faced to the corresponding plurality of screens, and at the time of each facing, The squeegee can continuously move the pressure contact area between the outer peripheral surface of each magnetic pole part and the screen, so that the magnetic powder applied in advance on each screen can be uniformly applied to the outer peripheral surface of the corresponding magnetic pole part by the squeegee. Because it can be applied automatically, the magnetic powder application work can be performed efficiently and automatically, and the thickness of the magnetic powder layer can be made uniform in each part, ensuring stable quality, and the advancement speed of the stencil can be simply adjusted. The thickness of the magnetic powder layer can also be easily adjusted.

[Brief explanation of drawings]

Fig. 1 is a side view of the magnetic powder coating device, Fig. 2 is an enlarged side view showing the magnetic powder application, Fig. 3 is a partial perspective view showing the relationship between the screen and the magnetic pole section, and Fig. 4 a to g are magnetic powder application. It is a process explanatory diagram. C...field iron core, _D1 ...stencil drive device,
D ₂ ... Drive device for support stand, D ₃ ... Drive device for squeegee, In... Interlocking mechanism, M... Magnetic powder, P ₁ , P ₂ ... First,
2nd magnetic pole part, 1... fuselage, 7... stencil, 9 ₁ ,
9 ₂ ...first and second screens, 17...squeegee,
21... Hydraulic cylinder as a drive device, 22... Support stand, 23... Support shaft, 24... Pinion, 26... Rack.

Claims (1)

[Claims] 1 On the outer peripheral surface of the plurality of magnetic pole parts P ₁ and P ₂ of the field core C,
This is a magnetic powder coating device for applying magnetic powder M imparted with adhesiveness by a binder, and includes a machine body 1 and a plurality of magnetic pole parts P 1 and _{P 2 supported} by the machine body 1 so as to be able to reciprocate in the front and rear directions thereof. A plurality of screens 9 ₁ and 9 ₂ each having substantially the same shape as the developed shape of the outer peripheral surface of
A stencil 7 arranged in parallel in the longitudinal direction of the fuselage 1 at an interval equal to the circumferential interval between the outer peripheral surfaces of the plurality of magnetic pole parts P ₁ and P ₂ , and a stencil for reciprocating the stencil 7 in the longitudinal direction of the fuselage 1. A drive device D ₁ and a support shaft 23 that can support the magnetic field core C concentrically below the stencil 7 and are perpendicular to the longitudinal direction of the fuselage 1 and parallel to the screens 9 ₁ and 9 ₂ are rotatable. A support stand 22 provided in
Then, this support stand 22 is held so that the outer circumferential surfaces of the magnetic pole parts P ₁ and P ₂ of the field core C on the support shaft 23 are aligned with the stencil 7.
a support stand drive device D ₂ for driving the stencil so that it can take an operating position close to the stencil 7 and a non-operation position spaced apart from the stencil 7; 7 and an interlocking mechanism In that interlocks and rotates the support shaft 23, and the magnetic pole parts P ₁ and P ₂ are placed at a predetermined coating operation position facing and close to the support base 22 with the stencil 7 in between. A squeegee 1 capable of applying magnetic powder M on the screens 9 ₁ and 9 ₂ to the outer peripheral surfaces of the magnetic pole parts P 1 and P 2 by applying pressure to the outer peripheral surfaces of the magnetic pole parts P ₁ and P ₂ through the screens ₉ 1 and 9 ₂
7, and a squeegee drive device for driving this squeegee 17 so that it can take the application operation position and a non-operation position spaced apart from the stencil 7.
_D3 , the interlocking mechanism In includes a rack 26 that is disposed so as to be able to move integrally with the stencil 7 and extends in the longitudinal direction of the fuselage 1, and a rack 26 on which the support base 22 is located in the operating position. When the support shaft 2 is supported by the support base 22 so as to mesh with each other,
3 and a pinion 24 that rotates in conjunction with the magnetic powder coating device.