Punching lamination gluing device and core stacking

Abstract

The invention relates to a punching sheet gluing device and an iron core stack, which belongs to the technical field of iron core stacking and solves the defects of the existing punching sheet stacking method, and comprises: a glue applying mechanism, which is provided with a glue containing cavity, and a surface of the glue applying mechanism for gluing is provided with a plurality of glue outlets; an offset printing template, which is used to cooperate with the punching sheet and is provided with a glue applying area, and the glue applying area at least surrounds the position corresponding to the oil hole of the punching sheet or at least surrounds the position corresponding to the oil hole of the punching sheet and a preset connecting channel between at least two oil holes, and the glue applying area is provided with a plurality of glue applying holes, and the glue applying holes can be connected with the corresponding glue outlets when the glue applying mechanism and the offset printing template are in cooperation so as to apply the glue sent out of the glue outlets to the surface of the punching sheet. The punching sheet gluing device of the invention solves the problems of the existing punching sheet point gluing method.

Description

Technical Field

[0001] The invention relates to the technical field of iron core lamination, and in particular to a punching sheet gluing device and an iron core lamination. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The core of the stator or rotor of the motor is usually made of multiple stacked silicon steel sheets, which are also called laminations or punchings. The connection between adjacent punchings usually includes: riveting, dispensing and prefabricated self-adhesive layers. Although the use of prefabricated self-adhesive layers can form a complete bond between the punchings, the production cost is high.

[0004] The riveting and gluing methods are low-cost and usually only form adhesion in small discrete areas between adjacent punching sheets, with many small gaps between the punching sheets.

[0005] For the stator core with an internal oil-cooling structure, oil holes for cooling oil to pass through will be formed on the punching sheets. On the one hand, there is no closed adhesion structure formed around the oil holes. In the subsequent paint dripping process to increase the insulation performance of the stator, there is a great risk that the oil holes will be blocked by the resin applied during the paint dripping process; on the other hand, if the amount of glue dispensed is not well controlled and too much glue is applied, there is a risk that the glue itself will enter the oil holes and form a blockage.

[0006] For the rotor core with an internal oil cooling structure, similarly, oil holes for cooling oil to pass through will be formed on the punching sheets. On the one hand, there is no closed adhesion structure formed around the oil holes. During the operation of the rotor, the cooling oil in the cooling channel will flow out due to centrifugal force, forming an uneven distribution between the punching sheets, which may affect the dynamic balance of the rotor; on the other hand, if the amount of glue dispensed is not well controlled and too much glue is applied, there is a risk that the glue itself will enter the oil hole and form a blockage. Summary of the invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a punching sheet gluing device and a core stack, which overcomes the defects of the existing glue point bonding and fixing between punching sheets.

[0008] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0009] In a first aspect, an embodiment of the present invention provides a punching sheet gluing device, comprising:

[0010] The glue applying mechanism is provided with a glue containing cavity, and a surface of the glue applying mechanism for applying glue is provided with a plurality of glue outlets;

[0011] The offset printing template is used to cooperate with the punching sheet and is provided with a glue application area. The glue application area at least surrounds the position corresponding to the oil hole of the punching sheet or at least surrounds the oil hole of the punching sheet and the position corresponding to the preset connecting channel between at least two oil holes. The glue application area is provided with multiple glue application holes. The glue application holes can be connected with the corresponding glue outlet when the glue application mechanism and the offset printing template are in the cooperative state so as to apply the glue delivered from the glue outlet to the surface of the punching sheet.

[0012] Optionally, it also includes a fixed support, which is used to fix the punching sheet to be glued;

[0013] The fixed support comprises a support plate, and a positioning column matching the central through hole of the punching sheet is provided at the center of the support plate.

[0014] Optionally, it also includes an upper tooling plate detachably fixed to the glue application mechanism and a lower tooling plate detachably connected to the fixed support, and at least one of the upper tooling plate and the lower tooling plate is connected to the actuating mechanism to achieve movement toward and away from each other.

[0015] Optionally, the glue applying mechanism includes a glue applying container, a glue outlet net is provided at the bottom of the glue applying container, the glue outlet net is provided with multiple glue outlets, a glue containing cavity is provided in the glue applying container, the glue containing cavity is connected to the glue pump through a glue feeding pipeline, the glue pump is connected to the glue outlet pipeline, and the glue outlet pipeline is connected to multiple glue outlet branches arranged toward the glue outlet net.

[0016] Optionally, a pressure detection element and a flow detection element are installed on the glue delivery pipeline.

[0017] Optionally, an annular boss is provided on the periphery of the offset printing template, the inner diameter of the annular boss matches the outer diameter of the punching sheet, and the thickness of the annular boss matches the thickness of the punching sheet.

[0018] Optionally, at least the gluing area of ​​the offset printing template is made by a 3D printing method.

[0019] Optionally, on the projection surface along the axial direction of the punching sheet, the glue application area covers the entire offset printing template;

[0020] or,

[0021] Except for the area corresponding to the magnetic steel position in the offset printing template, the rest of the area is the glue application area;

[0022] or,

[0023] Except for the areas corresponding to the magnetic steel position and the oil hole position in the offset printing template, the rest of the areas are glue application areas.

[0024] Optionally, along the axial projection of the punching sheet, the glue application area of ​​the offset printing template does not cover the magnetic steel position, the oil hole position and the position of the preset connecting channel in the punching sheet; the position of the preset connecting channel is located between at least two adjacent oil holes;

[0025] or,

[0026] The oil holes of the punching plate include a plurality of oil inlet holes and oil outlet holes arranged alternately;

[0027] Along the axial projection of the punching sheet, the glue application area of ​​the offset printing template does not cover the magnetic steel position and the oil hole position in the punching sheet and the position of the preset connecting channel;

[0028] The preset connecting channel is located between at least two adjacent oil inlet holes and at least two adjacent oil outlet holes.

[0029] In a second aspect, an embodiment of the present invention provides a method for preparing a core stack using the punching sheet gluing device described in the first aspect:

[0030] The gluing mechanism moves toward the punching sheet, the offset printing template cooperates with the punching sheet, and the gluing mechanism applies glue to the surface of the punching sheet through the glue outlet and the glue holes in the gluing area.

[0031] After the gluing of a punch is completed, the gluing mechanism moves away from the glued punch, and the offset printing template leaves the glued punch.

[0032] After the sheet to be glued and the sheet already glued are superimposed, the glue applying mechanism moves toward the sheet to be glued. After the offset printing template and the sheet to be glued are matched, the glue applying mechanism squeezes the sheet to be glued and the sheet already glued through the offset printing template. While the glue applying mechanism squeezes the sheet, it applies glue to the sheet to be glued through the glue outlet and the glue holes in the glue applying area.

[0033] In a third aspect, an embodiment of the present invention provides a core stack, comprising a plurality of punching sheets, which are prepared using the core stack preparation method described in the second aspect, or the punching sheets are bonded together using the punching sheet bonding device according to the first aspect.

[0034] The beneficial effects of the present invention include at least one of the following:

[0035] 1. In the punching sheet gluing device of the present invention, the offset printing template is provided with a gluing area, the gluing area at least surrounds the position corresponding to the punching sheet oil hole or at least surrounds the punching sheet oil hole and the position corresponding to the preset connecting channel between at least two oil holes, the gluing area is provided with a plurality of gluing holes, after gluing, the outer periphery of the oil hole can be sealed by the applied glue, for the stator core, it is avoided that the resin enters the oil hole during the paint dripping process and seals the oil hole, and for the rotor core, it is avoided that the cooling oil in the oil hole flows out due to centrifugal force and affects the dynamic balance of the rotor.

[0036] 2. The gluing area of ​​the punching sheet gluing device of the present invention is made by 3D printing. Through 3D printing, the size of the gluing hole can be made smaller than the set value, and the size of the gluing hole can be made smaller, so that the amount of glue reaching the punching sheet surface through the gluing hole can be accurately controlled, avoiding the phenomenon that the glue enters the oil hole and blocks the oil hole due to excessive gluing. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0038] Figure 1 This is an exploded schematic diagram of the overall structure of Embodiment 1 of the present invention (including the punching sheet);

[0039] Figure 2 It is a schematic diagram of the assembly of the embodiment 1 of the present invention and the punching sheet;

[0040] Figure 3 It is a schematic diagram of the assembly of the fixed support, the lower tooling plate and the offset printing template in Example 1 of the present invention (the punching sheet is included in the figure);

[0041] Figure 4 It is a structural schematic diagram of the glue application mechanism in Example 1 of the present invention;

[0042] Figure 5 is a cross-sectional view of the glue application mechanism in Example 1 of the present invention;

[0043] Figure 6 It is a schematic diagram of the assembly of the offset printing template and the punching sheet in Embodiment 1 of the present invention;

[0044] Figure 7 is a schematic diagram of the assembly process of the offset printing template and the punching sheet in Example 1 of the present invention;

[0045] Figure 8 It is a schematic diagram of the cooperation between the annular boss and the punching sheet of the offset printing template in Example 1 of the present invention;

[0046] Fig. 9 is a top view of the first punching sheet that can be processed by Embodiment 1 of the present invention;

[0047] Fig.10 The first possible offset printing template provided by the embodiment 1 of the present invention is Fig. 9 A top view of the corresponding punching sheet;

[0048] Fig.11 is a top view of the second punching sheet that can be processed by embodiment 1 of the present invention;

[0049] Fig.12 The second possible offset printing template provided by the embodiment 1 of the present invention is Fig.11 A top view of the corresponding punching sheet;

[0050] Fig.13 is a top view of a third punching sheet that can be processed by Embodiment 1 of the present invention;

[0051] Fig.14 The third possible offset printing template provided by the embodiment 1 of the present invention is Fig.13 A top view of the corresponding punching sheet;

[0052] Fig.15 is a top view of a fourth punching sheet that can be processed by Embodiment 1 of the present invention;

[0053] Fig.16 The fourth possible offset printing template provided by the embodiment 1 of the present invention is Fig.15 A top view of the corresponding punching sheet;

[0054] Fig.17 is a top view of the fifth punching sheet that can be processed by Embodiment 1 of the present invention;

[0055] Fig.18 The fifth possible offset printing template provided by the embodiment 1 of the present invention is Fig.17 A top view of the corresponding punching sheet;

[0056] Among them, 1. upper tooling plate, 2. lower tooling plate, 3. glue application mechanism, 4. fixed support, 5. offset printing template, 6. punching sheet;

[0057] 201. Fixed plate, 202. Support seat;

[0058] 301. glue container, 302. fixed plate;

[0059] 401. Support plate, 402. Positioning column;

[0060] 501. annular boss, 502. glue application area;

[0061] 601. Magnetic steel position, 602. Oil hole position, 603. Preset connecting channel, 604. Oil inlet hole, 605. Oil outlet hole, 606. Preset connecting channel for oil inlet hole, 607. Preset connecting channel for oil outlet hole;

[0062] 30101. partition, 30102. glue containing chamber, 30103. glue pump, 30104. glue delivery pipeline, 30105. glue outlet pipeline, 30106. glue outlet branch pipe, 30107. glue outlet net, 30108. glue filling port, 30109. sealing ring;

[0063] 50201. Glue hole. DETAILED DESCRIPTION

[0064] For the convenience of description, if the words "upper" and "lower" appear in the present invention, they only indicate that they are consistent with the upper and lower directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0065] Example 1

[0066] This embodiment provides a punching sheet gluing device, such as Figure 1-Figure 2 As shown, it includes an upper tooling disk 1, a lower tooling disk 2, a glue applying mechanism 3, a fixed support 4, and an offset printing template 5. The upper tooling disk 1 is detachably connected to the upper end of the glue applying mechanism 3, the lower surface of the glue applying mechanism 3 used for glue application is detachably connected to the offset printing template 5, the lower tooling disk 2 is detachably connected to the fixed support 4, and the fixed support 4 is used to place the punching sheet 6 to be glued. The upper tooling disk 1, the lower tooling disk 2, the glue applying mechanism 3, the fixed support 4 and the offset printing template 5 are coaxially arranged. The upper tooling disk 1 and the lower tooling disk 2 can be respectively connected to corresponding actuating mechanisms, and the actuating mechanisms can drive the corresponding upper tooling disk 1 and the lower tooling disk 2 to move toward or away from each other. As shown Figure 5 As shown, the glue-applying mechanism 3 is provided with a glue-containing cavity 30102, and a surface of the glue-applying mechanism 3 for cooperating with the offset printing template 5 is provided with a plurality of glue outlets. The offset printing template 5 is used to cooperate with the punching sheet 6, and a glue-applying area 502 is provided on the offset printing template 5, and a plurality of glue-applying holes 50201 corresponding to the glue outlets are provided on the glue-applying area 502, and the glue in the glue-containing cavity 30102 can flow out through the glue outlets and the glue-applying holes 50201 to be applied on the surface of the punching sheet 6.

[0067] like Figure 3 As shown, the fixed support 4 includes a support plate 401, and the support plate 401 is a circular plate or a square plate, etc., preferably a circular plate. A coaxial positioning column 402 is provided at the center of the support plate 401, and the positioning column 402 matches the through hole in the center of the punching sheet 6. The positioning column 402 can pass through the punching sheet 6 through the through hole in the center of the punching sheet 6, thereby positioning the punching sheet 6, and the punching sheet 6 can be stacked on the support plate 401.

[0068] Furthermore, a keyway is provided on the positioning column 402 , and the protrusion provided on the inner annular surface of the punching piece 6 can be embedded in the keyway, so that the punching piece 6 can be positioned along the annular direction on the fixed support 4 .

[0069] The support plate 401 is detachably fixed on the lower tooling plate 2. In this embodiment, the lower tooling plate 2 includes a fixing plate 201, and the shape of the fixing plate 201 matches the shape of the supporting plate 401. The upper surface of the fixing plate 201 is detachably fixedly connected to the supporting plate 401; the lower surface of the fixing plate 201 is provided with a supporting seat 202, and the supporting seat 202 is used to connect with the actuating mechanism.

[0070] In this embodiment, a plurality of first fixing holes are arranged at equal intervals along the circumferential direction at the edge of the support plate 401. Correspondingly, a plurality of second fixing holes matching the first fixing holes are arranged at equal intervals along the circumferential direction at the edge of the fixing plate 201. The support plate 401 and the fixing plate 201 are detachably fixedly connected through the first fixing holes, the second fixing holes and the threaded fasteners. Preferably, the threaded fasteners are bolts, nuts or screws, etc., and those skilled in the art can set them according to actual needs.

[0071] Furthermore, a plurality of mounting holes are provided at the bottom of the support base 202 for connection with the actuating mechanism.

[0072] like Figure 4 As shown, the glue applying mechanism 3 includes a glue applying container 301 . The glue applying container 301 adopts an annular structure, and its internal channel matches with the positioning column 402 so that the positioning column 402 can pass through the glue applying mechanism 3 .

[0073] The glue container 301 is provided with a glue containing cavity 30102 inside for containing the glue to be applied.

[0074] The lower surface of the glue container 301 is used to fit with the offset printing template 5 as a glue application surface. The glue application surface is provided with a plurality of glue outlets densely distributed in an array, and the glue in the glue holding cavity 30102 can flow out through the glue outlets.

[0075] The glue outlet area is 0.5-1mm 2 The circular or square openings may be used, but the present application does not limit this, and preferably a circular opening is used. The interval between adjacent glue outlets is 0.4 mm to 0.6 mm, preferably 0.5 mm. After the offset printing template 5 is attached to the glue applying mechanism 3, the corresponding glue outlets and the glue applying holes 50201 can be connected to each other.

[0076] In this embodiment, not every glue outlet corresponds to a glue hole 50201. For example, the area on the offset printing template 5 corresponding to the punching oil hole and the magnetic steel position is not provided with a glue hole 50201. Therefore, the glue outlet corresponding to the oil hole and the magnetic steel position area is blocked by the offset printing template 5.

[0077] Furthermore, a plurality of glue outlets are arranged in an array on the entire plane of the lower surface of the glue dispensing container 301 to facilitate uniform glue dispensing.

[0078] In this embodiment, Figure 5As shown, a partition 30101 is provided inside the glue application container 301 to divide the inside of the glue application container 301 into three chambers distributed up and down. The upper chamber is used as a glue holding chamber 30102, and a glue pump 30103, a temperature detection element, a flow meter and a pressure gauge are installed in the middle chamber. The glue holding chamber 30102 is connected to the glue pump 30103 through a glue delivery pipeline 30104, and the glue pump 30103 is connected to a glue outlet pipeline 30105. After the glue outlet pipeline 30105 passes through the partition 30101, a plurality of glue outlet branch pipes 30106 are connected. The plurality of glue outlet branch pipes 30106 are distributed at equal intervals along the annular direction, and the number of the glue outlet branch pipes 30106 is six or eight or more, which can be determined according to actual needs. In this embodiment, eight glue outlet branch pipes 30106 are provided. The glue outlet branch pipe 30106 is located in the lower chamber for discharging glue. A glue outlet net 30107 is provided at the bottom end of the glue dispensing container 301 . The glue outlet net 30107 is provided with a plurality of glue outlets distributed in an array. The glue outlet branch pipe 30106 is arranged toward the glue outlet net 30107 . The glue delivered by the glue outlet branch pipe 30106 can flow out through the glue outlets on the glue outlet net 30107 .

[0079] The glue containing cavity 30102 is also connected to the glue replenishing port 30108 , and the glue replenishing port 30108 is used to replenish glue into the glue containing cavity 30102 .

[0080] Seal rings 30109 are provided between the glue feeding pipeline 30104 and the glue outlet pipeline 30105 and the partition 30101 for sealing. The flow meter and the pressure gauge are installed on the glue feeding pipeline 30104. The temperature detection element adopts a temperature sensor, which is installed on the side wall of the middle chamber of the glue application container 301 to detect the chamber temperature.

[0081] The glue pump 30103 can pump the glue contained in the glue cavity 30102 to flow out through the glue outlet of the glue outlet net 30107. By pumping glue through the glue pump 30103, the amount of glue applied can be controlled.

[0082] By controlling the pressure and flow of the glue outlet branch pipe 30106 through the glue pump 30103, the amount of glue applied each time can be controlled. The pressure gauge as a pressure detection element can monitor the glue outlet pressure in real time, and the flow meter as a flow detection element can monitor the glue outlet flow in real time.

[0083] The upper part of the glue application container 301 is coaxially connected with a fixed plate 302. The fixed plate 302 is detachably fixedly connected to the upper tooling plate 1.

[0084] Specifically, the outer edge of the fixing plate 302 is provided with a plurality of third fixing holes at equal intervals along the circumferential direction. Correspondingly, the outer edge of the upper tooling plate 1 is provided with a plurality of fourth fixing holes matching the third fixing holes at equal intervals along the circumferential direction, and the fixing plate 302 can be detachably fixedly connected with the upper tooling plate 1 through the third fixing holes, the fourth fixing holes and the threaded fasteners. Preferably, the threaded fasteners are bolts, nuts or screws, etc., and those skilled in the art can select them according to actual needs.

[0085] Furthermore, the upper tooling plate 1 is provided with a plurality of mounting holes for connecting with the actuating mechanism.

[0086] like Figure 6-Figure 8 As shown, the offset printing template 5 adopts a disc-shaped structure matching the punching sheet 6, and has a glue application area 502. A center hole matching the positioning column 402 is provided in the center of the offset printing template 5, and the positioning column 402 can pass through the offset printing template 5 through the center hole. An annular boss 501 is provided on the outer edge of the offset printing template 5. The inner diameter of the annular boss 501 matches the diameter of the punching sheet 6, and the thickness of the annular boss 501 matches the thickness of the punching sheet 6. When the offset printing template 5 and the punching sheet 6 are assembled, the offset printing template 5 can be directly buckled on the punching sheet 6, and the punching sheet 6 can be accommodated in the space inside the annular boss 501, and the outer annular surface of the punching sheet 6 contacts the inner annular surface of the annular boss 501. The thickness of the punching sheet 6 is equal to the thickness of the annular boss 501. With this arrangement, on the one hand, the punching sheet 6 and the offset printing template 5 are relatively positioned, and on the other hand, when applying glue, even if the amount of glue applied is too much, under the blocking effect of the annular boss 501, the glue will not overflow to the peripheral area of ​​the punching sheet 6.

[0087] The gluing area 502 at least surrounds the area corresponding to the position of the oil hole; in another embodiment, the gluing area 502 at least surrounds the area corresponding to the position of the oil hole and at least the preset connecting channel between two oil holes. Except for the gluing area 502 in the offset printing template 5, no gluing is performed on the remaining areas. The gluing area 502 is provided with a plurality of gluing holes 50201, which are single holes of very small size, and the plurality of gluing holes 50201 are distributed in a dense array in the gluing area 502. The gluing holes 50201 correspond to the glue outlet. After the gluing mechanism 3 is attached to the offset printing template 5, the gluing holes 50201 can be connected to the corresponding glue outlet, receive the glue flowing out of the glue outlet, and allow the glue to pass through the gluing holes 50201 to glue the punching sheet 6.

[0088] Since the glue application hole 50201 is a very small hole, the amount of glue provided each time the glue is applied is very small, which prevents excessive glue from flowing to undesired positions when the punching sheets 6 are squeezed against each other, thereby achieving glue application on the surface of the punching sheets 6 and avoiding the phenomenon of glue entering the oil holes and blocking the oil holes due to excessive glue application.

[0089] In this embodiment, the offset printing template 5 is formed by 3D printing. In particular, the glue application area 502 of the offset printing template 5 is formed by 3D printing. By using 3D printing, the size of the glue application hole 50201 can be made smaller than the set value, for example, the minimum aperture is only 100 μm. Of course, the specific aperture can be set according to the actual production situation, such as the viscosity of the glue used. The glue application hole 50201 is small in size, so that the amount of glue reaching the punching sheet 6 through the glue application hole 50201 can be accurately controlled.

[0090] Furthermore, the offset printing template 5 is detachably fixedly connected to the lower surface of the glue container 301 of the glue applying mechanism 3. On the one hand, it is convenient for the glue applying mechanism 3 to drive the offset printing template 5 to move. On the other hand, when making different iron cores, it is convenient to replace the offset printing template 5 of different specifications as needed.

[0091] It is understandable that the glue applying mechanism 3 and the offset printing template 5 can be arranged separately. When this arrangement is adopted, when the glue applying mechanism 3 is raised, the offset printing template 5 needs to be manually removed, and then the punching sheets 6 are stacked.

[0092] Preferably, the outer edge of the offset printing template 5 is detachably fixedly connected to the bottom surface of the glue application container 301 by a plurality of bolts arranged along the circumferential direction. In other embodiments, the offset printing template 5 can also be detachably fixedly connected to the bottom surface of the glue application container 301 by plugging or the like.

[0093] According to the patterns of the glue-coating areas on different punched sheets, different offset printing templates can be selected for gluing.

[0094] In one embodiment, the shape of the punch 6 is as follows Fig. 9 As shown, the distribution of the glue application area 502 on the offset printing template 5 is as follows Fig.10 As shown. On the projection surface along the axial direction of the punch 6, the glue application area 502 covers the entire surface of the offset printing template 5, and the entire glue application area 502 is evenly distributed with multiple glue application holes 50201 in an array. When applying glue, the entire surface of the punch 6 is fully coated with glue. In this way, the glue application area of ​​the punch 6 is large, and the offset printing template 5 is simple in design. However, the glue pump needs to control the glue application amount for the area where the punch oil hole and the magnetic steel are aligned. In this embodiment, it is necessary to add a subsequent degumming step for the corresponding positions of the punch oil hole and the magnetic steel.

[0095] In another embodiment, the shape of the punch is as follows Fig.11 As shown, the distribution of the glue application area 502 on the offset printing template 5 is as follows Fig.12As shown. On the projection plane along the axial direction of the punch 6, in the offset printing template 5, except for the area corresponding to the punch magnetic steel position 601, the rest of the offset printing template 5 is the glue application area 502. When applying glue, the punch 6 is completely coated with glue except for the magnetic steel position 601. In this way, the glue application area of ​​the punch is large and the offset printing template design is simple. However, for the area corresponding to the oil hole position 602, the glue pump needs to control the glue application amount. In this embodiment, it is necessary to add a subsequent degumming step at the oil hole position.

[0096] In the third embodiment, the shape of the punch 6 is as follows: Fig.13 As shown, the distribution of the glue application area 502 on the offset printing template 5 is as follows Fig.14 As shown. On the projection plane along the axial direction of the punch 6, in the offset printing template 5, except for the area corresponding to the punch magnetic steel position 601 and the oil hole position 602, the rest of the offset printing template 5 is the glue application area 502. When applying glue, the entire punch 6 is coated with glue except for the area corresponding to the magnetic steel position 601 and the oil hole position 602. In this way, the control requirements for the glue pump are relatively low, the gluing process is simple, the outer periphery of the oil hole of the punch is surrounded and closed by glue, and the oil will not directly seep out from between adjacent punches.

[0097] In the fourth embodiment, the shape of the punch 6 is as follows: Fig.15 As shown, eight oil holes are arranged in the circumferential direction on the punching sheet 6, and the eight oil holes are divided into four groups, each group of which consists of two adjacent oil holes. In the present embodiment, the two adjacent oil holes in each group are designed to be interconnected in the entire oil circuit, and this interconnection is formed through the gap between adjacent punching sheets 6, that is, when applying glue between adjacent punching sheets 6, the overall interval formed by the two oil holes in each group is avoided, and the corresponding area of ​​the overall interval on the offset printing template 5 is the connecting channel position. It can be understood that the connecting channel position is closed on the offset printing template 5, and the glue cannot penetrate at this position, so a connected oil circuit is formed between adjacent punching sheets 6. The projection of the connecting channel position on the punching sheet 6 is also called the preset connecting channel 603. Here, the position of the preset connecting channel 603 does not include the position corresponding to the oil hole, and the distribution of the glue application area 502 on the offset printing template 5 is as shown in FIG. Fig.16 As shown. Along the axial projection of the punching sheet 6, the glue application area 502 of the offset printing template 5 does not cover the magnetic steel position, the oil hole position and the position of the preset connection channel 603 in the punching sheet 6; the position where the preset connection channel 603 is located is located between at least two adjacent oil holes; in this embodiment, it is located between two adjacent oil holes in the same group. In this way, there is no glue at the preset connection channel 603. After gluing, the oil paths between adjacent punching sheets 6 are connected, which can increase the fluidity of the oil paths, and the oil in other positions will not directly seep out from between two adjacent punching sheets 6.

[0098] In the fifth embodiment, the shape of the punch 6 is as follows Fig.17As shown, eight oil inlet holes 604 and eight oil outlet holes 605 are arranged in the circumferential direction of the punching plate 6. The oil inlet holes 604 and the oil outlet holes 605 are alternately distributed in the circumferential direction of the punching plate 6. Adjacent oil inlet holes 604 and oil outlet holes 605 form an oil inlet and outlet channel. The size of the oil inlet hole 604 is larger than that of the oil outlet hole 605. The eight oil inlet holes 604 are divided into four groups, and the same group is two adjacent oil inlet holes 604. The eight oil outlet holes 605 are divided into four groups, and the same group is two adjacent oil outlet holes 605. The distribution of the glue application area 502 on the offset printing template 5 is shown in FIG. Fig.18 As shown, in the offset printing template 5 , along the axial projection of the punching plate 6 , the gluing area 502 of the offset printing template 5 does not cover the magnetic steel position and the oil hole position in the punching plate 6 and the position of the preset connecting channel.

[0099] The position where the preset connection channel is located is between at least two adjacent oil inlet holes 604 and at least two adjacent oil outlet holes 605. In this embodiment, the position where the preset connection channel is located is between two oil inlet holes 604 in the same group and between two oil outlet holes 605 in the same group, forming an oil inlet preset connection channel 606 and an oil outlet preset connection channel 607. Here, the oil inlet preset connection channel 606 does not include the position corresponding to the oil inlet hole 604, and the oil outlet preset connection channel does not include the position corresponding to the oil outlet hole 605. With this setting, the preset connection channel positions between the oil inlet holes and the oil outlet holes in the same group are not coated with glue, which can connect the oil circuits between adjacent punching sheets 6 and increase the fluidity of the oil circuits. The remaining positions can prevent the oil from directly seeping out from between the adjacent punching sheets 6.

[0100] The actuating mechanism adopts an existing press or punching machine, etc., and technical personnel in this field can choose according to actual needs. The lower tooling plate 2 is fixed on the workbench of the actuating mechanism, and the upper tooling plate 1 is fixed on the moving part of the actuating mechanism, which can drive the gluing mechanism 3 and the offset printing template 5 to move toward or away from the punching sheet 6.

[0101] In the gluing device of this embodiment, since the gluing area 502 surrounds the area corresponding to the oil hole, after gluing, the outer periphery of the oil hole is sealed and surrounded by glue. For the stator core, this prevents the resin from entering the oil hole and sealing the oil hole during the paint dripping process. For the rotor core, this prevents the cooling oil in the oil hole from flowing out due to centrifugal force and affecting the dynamic balance of the rotor.

[0102] Example 2

[0103] This embodiment provides a method for preparing a core stack using the punching sheet gluing device of embodiment 1, comprising the following steps:

[0104] Step 1: Place the first punching sheet 6 on the support plate 401 , and the positioning column 402 passes through the first punching sheet 6 .

[0105] Step 2: The glue applying mechanism 3 drives the offset printing template 5 to move toward the first punching sheet 6 until the offset printing template 5 is matched with the first punching sheet 6 .

[0106] Step 3: The glue pump 30103 works, driving the glue in the glue chamber 30102 to flow to the surface of the punching sheet 6 through the glue outlet and the glue application hole 50201, thereby realizing the gluing of the punching sheet 6.

[0107] Step 4: After the first punching sheet 6 is glued, the glue-applying mechanism 3 drives the offset printing template 5 to move in a direction away from the punching sheet 6; then the second punching sheet 6 to be glued is stacked on the first punching sheet 6 to which glue has been applied, and the positioning column 402 passes through the second punching sheet 6.

[0108] Step 5: The glue applying mechanism 3 drives the offset printing template 5 to move toward the second punching sheet 6 until the offset printing template 5 cooperates with the second punching sheet 6; the glue applying mechanism 3 continues to move, so that the first punching sheet 6 and the second punching sheet 6 are squeezed, and then the two punching sheets 6 are glued and fixed, and at the same time the glue pump 30103 works to apply glue to the upper surface of the second punching sheet 6.

[0109] Step 6: Repeat steps 4 to 5 until all the punching sheets 6 are stacked, thereby completing the preparation of the entire core stack.

[0110] Example 3

[0111] This embodiment provides a core stack used as the core of the rotor or stator of a motor, including a plurality of punching sheets 6, which are prepared using the core stack preparation method of embodiment 2 or the punching sheets 6 are bonded together using the punching sheet bonding device according to embodiment 1.

[0112] Each oil cooling channel of the core stack is surrounded and sealed by glue. For the stator core, this prevents the resin from entering the oil holes and sealing the oil holes during the paint dripping process; for the rotor core, this prevents the cooling oil in the oil holes from flowing out due to centrifugal force and affecting the dynamic balance of the rotor.

[0113] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Punching sheet gluing device, characterized in that: include: The glue applying mechanism is provided with a glue containing cavity, and a surface of the glue applying mechanism for applying glue is provided with a plurality of glue outlets; The offset printing template is used to cooperate with the punching sheet, and is provided with a glue application area, which at least surrounds the punching sheet oil hole and the position corresponding to the preset connection channel between at least two oil holes, and the glue application area is provided with a plurality of glue application holes, which can be connected with the corresponding glue outlet when the glue application mechanism and the offset printing template are in cooperation, so as to apply the glue sent out of the glue outlet to the surface of the punching sheet; Along the axial projection of the punching sheet, the glue application area of ​​the offset printing template does not cover the magnetic steel position, the oil hole position and the position of the preset connecting channel in the punching sheet; the position of the preset connecting channel is located between at least two adjacent oil holes; At least the glue application area of ​​the offset printing template is made by a 3D printing method; An annular boss is arranged on the periphery of the offset printing template, the inner diameter of the annular boss matches the outer diameter of the punching sheet, and the thickness of the annular boss matches the thickness of the punching sheet.

2. The punching sheet gluing device according to claim 1, characterized in that: It also includes a fixed support, which is used to fix the punching sheet to be glued; The fixed support comprises a support plate, and a positioning column matching the central through hole of the punching sheet is provided at the center of the support plate.

3. The punching sheet gluing device according to claim 2, characterized in that: It also includes an upper tooling disc detachably fixed to the glue applying mechanism and a lower tooling disc detachably connected to the fixed support. At least one of the upper tooling disc and the lower tooling disc is connected to the actuating mechanism to achieve movement toward and away from each other.

4. The punching sheet gluing device according to claim 1, characterized in that: The glue applying mechanism comprises a glue applying container, a glue outlet net is provided at the bottom of the glue applying container, the glue outlet net is provided with a plurality of glue outlets, a glue containing cavity is provided in the glue applying container, the glue containing cavity is connected to a glue pump through a glue feeding pipeline, the glue pump is connected to a glue outlet pipeline, and the glue outlet pipeline is connected to a plurality of glue outlet branches arranged toward the glue outlet net.

5. The punching sheet gluing device according to claim 4, characterized in that: The glue delivery pipeline is equipped with a pressure detection element and a flow detection element.

6. The punching sheet gluing device according to claim 1, characterized in that: On the projection surface along the axial direction of the punching sheet, the glue application area covers the entire offset printing template; or, Except for the area corresponding to the magnetic steel position in the offset printing template, the rest of the area is the glue application area; or, Except for the areas corresponding to the magnetic steel position and the oil hole position in the offset printing template, the rest of the areas are glue application areas.

7. The punching sheet gluing device according to claim 1, characterized in that: The oil holes of the punching plate include a plurality of oil inlet holes and oil outlet holes arranged alternately; Along the axial projection of the punching sheet, the glue application area of ​​the offset printing template does not cover the magnetic steel position and the oil hole position in the punching sheet and the position of the preset connecting channel; The preset connecting channel is located between at least two adjacent oil inlet holes and at least two adjacent oil outlet holes.

8. An iron core stack, comprising a plurality of punching sheets, characterized in that: The punching sheets are bonded together using a punching sheet gluing device according to any one of claims 1 to 7.

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