JP3975808B2 - Powder resin immersion treatment equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a powder resin immersion treatment apparatus for partially immersing a joining portion or the like of segments constituting a winding of a rotating electrical machine in a powder resin.
[0002]
[Prior art]
Recently, with an increase in electrical loads such as safety control devices, vehicle alternators are increasingly required to improve power generation capacity. In order to meet such a demand for power generation capacity improvement, U-shaped electrical conductors are regularly arranged and inserted into the stator slots, and the ends thereof are joined by welding or the like to form a stator winding. A technique for achieving output is known. In such a stator winding, a joint portion is arranged in an annular shape on one end face side of the stator core in order to ensure electrical insulation between each joint portion or between each joint portion and a frame or the like. In addition, an insulation treatment such as fluid immersion using a powder resin is performed.
[0003]
In general, in fluid immersion using a powder resin, a method of masking a workpiece that is an object to be processed is employed when it is desired to limit a processing range. Even when the shape and processing range of the entire workpiece are relatively simple, masking is usually required because bumps and unexpected flows exist in the surface layer portion of the powder resin filled in the container. However, while this method can reliably adhere the powder resin to the desired location, it requires a lot of knowledge to design the masking jig and make adjustments during actual use, and has the demerit of increasing equipment costs. is there.
[0004]
For example, a powder resin immersion treatment method disclosed in Japanese Patent Application Laid-Open No. 2001-54247 is known as a conventional technique for performing fluid immersion on a part of a workpiece without masking. In this immersion treatment method, the stator is lowered so as to be immersed in the powder resin while horizontally vibrating a container filled with the powder resin. Since compressed air is ejected from the porous plate at the bottom of the powder resin, the powder resin can easily flow along with the jet of air, and the air flow and vibration transmitted from the container The powder resin adheres well to the necessary range of the tip of the segment conductor disposed at the lower part of the stator.
[0005]
[Problems to be solved by the invention]
By the way, when the powder resin immersion treatment method disclosed in Japanese Patent Application Laid-Open No. 2001-54247 described above is actually tried, bumping occurs in a region other than a very limited region in the center, and the flow of the powder resin. It has been confirmed that the influence of the above cannot be removed, and there is a problem that the stabilization region of the surface layer portion is narrow with respect to the size of the container. This is probably because a vibrating body that vibrates the container horizontally is used to stabilize the surface state of the powder resin, and the powder resin vibrates in a random direction. For this reason, it is essential to expand the stabilization area of the surface layer part considering the increase in the size of the workpiece and the large number of workpieces. However, if an attempt is made to expand a part of the stabilization area of the surface layer part, the powder resin is filled. The container itself needs to be extremely large and is not practical.
[0006]
Further, as other conventional techniques for immersing a workpiece in a powder resin, there are known immersing methods disclosed in Japanese Patent Application Laid-Open Nos. 60-101921 and 52-36138.
The present invention was created in view of such points, and its purpose is to ensure a large stabilization region in the surface layer portion of the powder resin, and to immerse the powder resin without the need for masking. It is to provide a processing apparatus.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, a powder resin immersion treatment apparatus of the present invention includes a fluid tank that contains a powder resin and a powder resin that is contained in the fluid tank by applying vibration to the fluid tank. A vibrating device that moves in one direction, and an object moving device that moves the object so that a part of the object to be dipped is immersed in the surface layer portion of the powder resin in a state where vibration is applied by the vibrating device. It has. It is possible to stably move the powder resin in the fluid tank in one direction by vibrating it in one direction with a vibration device, and to secure a stable region in a wide range in the surface layer part of the powder resin. Can do. Thereby, it becomes possible to perform the immersion process with respect to a predetermined area | region, without masking with respect to the target object of an immersion process.
[0008]
Moreover, it is installed in the lower part of the fluidization tank mentioned above, and is installed in the lower part of a perforated plate which has many ejection holes which eject compressed air, and the lower part of a perforated plate, and the compressed air ejected from many ejection holes It is desirable to further include an air chamber that makes the pressure substantially constant. By feeding compressed air into the powder resin, the powder resin is easy to flow, so that the state of the surface layer portion of the powder resin during vibration can be further stabilized. In addition, by causing the powder resin to move in one direction, bumping caused by partial air collection can be prevented.
[0009]
Moreover, it is desirable that the above-described fluid tank has a circular cross section, and the vibration exciter is a ball feeder that applies vibration along the circumferential direction of the fluid tank. By moving the powder resin along the circumferential direction in the flow tank having a circular cross section, there is no specific region for the flow of the powder resin such as corners, so the surface layer of the powder resin The entire part can be used as a stabilization region. Moreover, since the powder resin that moves in the circumferential direction returns to its original position after one round, this round movement operation is continuously repeated, so that it is possible to maintain the stabilization region for a long time. It becomes easy.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a powder resin immersion treatment apparatus according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an overall configuration of a powder resin immersion treatment apparatus according to an embodiment. As shown in FIG. 1, the powder resin immersion treatment apparatus 100 of the present embodiment includes a workpiece gripping device 10, a level sensor 20, a flow tank 30, a powder resin 40, a porous plate 50, an air chamber 60, and a vibration device 70. It is comprised including.
[0011]
The workpiece gripping device 10 is for gripping a workpiece 90 that is an object of immersion treatment and partially immersing it in the powder resin 40. The workpiece gripping device 10 is configured by a robot, for example, and a gripping unit 14 that grips a workpiece 90 is attached to the tip of an arm 12. FIG. 1 shows a case of two picking in which two workpieces 90 are simultaneously gripped and dipping is performed.
[0012]
The level sensor 20 is provided in the vicinity of the upper part of the fluid tank 30 and detects the surface position of the powder resin 40. For example, an optical level sensor 20 having a light emitting part and a light receiving part is used, and the powder is based on the time until the output light of the light emitting part reaches the light receiving part reflected by the surface of the powder resin 40. The distance to the surface of the resin 40 is measured.
[0013]
The fluid tank 30 is a container that accommodates the powder resin 40. In the embodiment, in order to circulate the powder resin 40 along one direction in the fluid tank 30, the fluid tank 30 having a circular cross-sectional shape is used. A perforated plate 50 is disposed at the bottom of the fluid tank 30.
[0014]
The powder resin 40 adheres to the heated work 90 and is thermally cured to electrically insulate the adhered portion. For example, an epoxy-based powder resin 40 is used.
The perforated plate 50 is provided with a large number of air ejection holes. As described above, the perforated plate 50 is disposed at the bottom of the fluid tank 30, and the flow of the powder resin 40 is facilitated by ejecting compressed air into the powder resin 40 from a number of ejection holes. Become.
[0015]
The air chamber 60 is for supplying compressed air to the respective ejection holes provided in the perforated plate 50. By temporarily storing the compressed air supplied from the outside in the air chamber 60, it becomes possible to eject the compressed air having a constant pressure from each ejection hole of the perforated plate 50.
[0016]
The vibration device 70 applies vibration to the entire fluid tank 30 in order to stabilize the surface layer state of the powder resin 40 accommodated in the fluid tank 30 and the flow direction of the powder resin 40. For example, a ball feeder that applies vibration to the fluid tank 30 so as to stably move the powder resin 40 in the fluid tank 30 in one direction is used as the vibration device 70. In this embodiment, such a vibration exciter 70 is installed on the lower side of the perforated plate 50 and the air chamber 60 provided in the lower part of the fluidized tank 30, and vibrations are applied to the entire plate. . In FIG. 1, the main body of the vibration device 70 is omitted, and the structure above the vibration plate that transmits vibration is illustrated.
[0017]
2 and 3 are diagrams illustrating specific examples of the workpiece 90. FIG. As shown in FIG. 2, in this embodiment, the stator 90 </ b> A used in the vehicle AC generator is gripped by the workpiece gripping device 10 as the workpiece 90. As shown in FIG. 3, the stator 90A is formed by inserting U-shaped segment conductors 92 into the slots of the stator core 94 and twisting the counter-turn portions, and then joining the end portions 96 together. It has a stator winding 98 configured. The end portion 96 of the segment conductor 92 is in a state where the insulating film formed on the outer peripheral portion is peeled off in order to join the end portion 96 of another adjacent segment conductor 92. Therefore, in order to ensure electrical insulation between the joints or between the joints and other members (frames and the like) after joining, the vicinity of the end 96 of the segment conductor 92 is set in a specific region (FIG. 2 and FIG. 2). Insulating process using the powder resin 40 is performed on the hatched area in FIG.
[0018]
The powder resin immersion treatment apparatus 100 of this embodiment has such a configuration, and the operation thereof will be described next.
The powder resin immersion treatment apparatus 100 of this embodiment is managed using the level sensor 20 so that the surface height (filling amount) of the powder resin 40 is always constant. Further, since the compressed air supplied into the air chamber 60 is ejected to the powder resin 40 filled in the fluidized tank 30 at a constant pressure through each ejection hole of the perforated plate 50, the ejected air The powder resin 40 mixed with is easy to flow. In particular, the vibration device 70 of the present embodiment uses a ball feeder, and the entire powder resin 40 that has become easy to flow moves at low speed so as to circulate in the fluid tank 30 along the horizontal direction. . In a vibration method having no normal directionality, movement of the entire resin cannot be expected, and a place where air easily passes, that is, bumping easily occurs. Prediction of the occurrence location is not easy, and since the occurrence location moves from time to time due to deterioration of the perforated plate 50, that is, clogging or the like, frequent adjustments such as changing the immersion position are required. According to the method of the present embodiment, since the entire powder resin 40 moves circumferentially, even if bumping occurs locally, the powder resin 40 supplied from the downstream side instantaneously breaks down instantaneously. Is defoamed. Further, since the flow is circumferential and low speed, and has the characteristics that no difference in powder level between the upstream and downstream occurs, the entire surface layer portion of the powder resin 40 becomes a stabilization region.
[0019]
After gripping the two stators 90 </ b> A by the gripping unit 14, the workpiece gripping device 10 holds the arm 12 so that only the lower portion (end portion 96) is immersed in the surface layer portion of the powder resin 40 while maintaining the horizontal state. move. At this time, the stator 90A is in a state of being heated in advance in a constant temperature bath so as to reach a predetermined temperature. The object to be treated can be a normal fluid immersion method for treating an uncharged material or an electrostatic fluid immersion method. In the case of the electrostatic fluid immersion method, each segment conductor 92 of the stator 90A is connected to the positive electrode of a predetermined power source, and the metal flow tank 30 is connected to the negative electrode of the power source. When the specific region is immersed in the powder resin 40, the powder resin 40 is surely attached to the segment conductor 92 charged to a positive potential.
[0020]
When a part of the stator 90A is immersed in the surface layer portion of the powder resin 40 in the fluidized tank 30 for a predetermined time and then pulled up, the powder resin 40 melted and gelated in a specific region of the stator 90A. Adheres in an almost uniform state.
FIG. 4 is a view showing a state of the powder resin 40 moving in the fluid tank 30. As shown in FIG. 4, a large number of ejection holes 52 are formed in the perforated plate 50 installed in the lower part of the fluidized tank 30, and the compressed air in the air chamber 60 passes through these ejection holes 52 and enters the powder resin 40. Therefore, the powder resin 40 is easy to flow.
[0021]
FIG. 5 is a view of the fluid tank 30 as viewed from above. The powder resin 40 is in a floating / flowing state due to the introduction of compressed air. In this state, the powder resin 40 in the fluid tank 30 is indicated by an arrow by applying vibration in one direction by the vibrating device 70. Move in a circle.
[0022]
FIG. 6 is a view showing the stator 90A after the powder resin 40 is uniformly adhered to a part thereof. As shown in FIG. 6, the powder resin 40 adheres to an end portion 96 of the segment conductor 92 that constitutes the stator winding 98 included in the stator 90A to a substantially constant height. In FIG. 6, only the end portions 96 adjacent in the circumferential direction are not covered with the powder resin 40, but the powder resins 40 attached to the end portions 96 are connected between the adjacent portions. The powder resin 40 may be separated at each end portion 96.
[0023]
Thus, in the powder resin immersion treatment apparatus 100 of the present embodiment, while maintaining the state where the powder resin 40 is easy to flow by ejecting compressed air from the perforated plate 50 arranged at the lower part of the fluid tank 30, A predetermined vibration is applied by the vibration device 70 such that the powder resin 40 moves in the circumferential direction of the fluid tank 30. Thereby, the whole surface layer part of the powder resin 40 can be stably moved in one direction, and a wide stabilization region is realized over the whole surface layer part. Therefore, a plurality of stators 90A can be simultaneously immersed in the powder resin 40 in the wide stabilization region by the workpiece gripping device 10, and work efficiency is improved by performing a multi-piece dipping process. Is possible. Moreover, in this stabilization region, since the powder resin 40 moves in one direction at a low speed, it is possible to avoid a bumping state in which the internal compressed air is locally ejected, so that masking is not performed. An immersion process can be performed on a specific region of the stator 90A.
[0024]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the above-described embodiment, the case where the end portion of the stator winding of the stator 90A used in the vehicle AC generator as the work 90 is dipped in the powder resin 40 has been described. The present invention can be applied to the case where the parts other than the stator of the above and the parts other than the vehicle alternator are immersed in the powder resin 40.
[0025]
In the above-described embodiment, the vibration device 70 is configured by a ball feeder and considered to move around the entire powder resin 40 filled in the fluidized tank 30. As long as the whole can be moved in one direction, a vibration device 70 other than the ball feeder may be used. For example, a linear feeder may be used as the vibration device 70, and the powder resin may move in one direction in a fluidized tank having a rectangular cross section.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of a powder resin immersion treatment apparatus according to an embodiment.
FIG. 2 is a diagram illustrating a specific example of a workpiece.
FIG. 3 is a diagram illustrating a specific example of a workpiece.
FIG. 4 is a view showing a state of a powder resin moving in a fluid tank.
FIG. 5 is a view of the fluid tank 30 as viewed from above.
FIG. 6 is a view showing the stator after the powder resin is uniformly attached to a part thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Work gripping device 12 Arm 14 Grasp unit 20 Level sensor 30 Fluid tank 40 Powder resin 50 Porous plate 60 Air chamber 70 Excitation device 90 Workpiece 90A Stator 92 Segment conductor 94 Stator core 96 End 98 Stator winding

Claims (3)

A fluid tank containing powder resin;
A perforated plate installed at the lower part of the fluidized tank and having a number of ejection holes for ejecting compressed air;
An air chamber which is installed at a lower portion of the perforated plate and makes the pressure of compressed air ejected from the plurality of ejection holes substantially constant;
By adding vibration along the circumferential direction to said fluidization vessel, said pressure moves the powder resin contained in the fluidized bath in the circumferential direction vibration apparatus,
An object moving device for moving the object so that a part of the object to be dipped is immersed in the surface layer portion of the powder resin in a state where vibration is applied by the vibration device;
A powder resin immersion treatment apparatus comprising: In claim 1,
The powder resin immersion treatment apparatus , wherein the fluid tank has a circular cross section . In claim 1 or 2,
The powder resin immersing apparatus is characterized in that the powder resin moves as a whole by circulating in the fluid tank along the horizontal direction .

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