Insulation paper forming device

Abstract

The utility model relates to an insulation paper forming device. The insulation paper forming device comprises a paper feeding wheel, a hemming part, an edge pressing part, an edge expanding part and a closing-in die. The paper feeding wheel is located on the conveying track and used for conveying insulation paper. The hemming part is arranged close to the inlet end and is used for bending two landing edges of the insulation paper; the edge pressing part is located at the downstream of the edge curling part, and the edge pressing part and the paper feeding wheel are matched with each other to carry out edge pressing treatment on the overlapped edges of the bent insulation paper, so that the two overlapped edges of the insulation paper are attached to the two long edges respectively; the edge expanding part is located at the downstream of the edge pressing part and used for expanding the edge of the insulation paper subjected to edge pressing treatment, so that the two landing edges are expanded by a preset angle in the direction away from the long edge of the insulation paper; the closing-in die is located on the downstream portion of the edge expanding component, an open groove is formed in the closing-in die, and a boss is arranged on the inner side of the open groove and used for narrowing the two long edges of the insulation paper in the process that the insulation paper penetrates through the open groove.

Description

Technical Field

[0001] The utility model relates to the field of manufacturing of motor stators, and particularly relates to an insulating paper forming device. Background Art

[0002] A motor is composed of a rotor and a stator. On the stator core of the motor, several slots are often provided, and an exciting winding is embedded in the slots. Since the exciting winding is composed of wires, in order to avoid conduction between the exciting winding and the stator core, that is, to keep insulation between the stator core and the exciting winding, insulating paper is inserted into each slot. The insulating paper has good insulation performance and can greatly improve the working performance of the motor.

[0003] Currently, before the insulating paper is inserted into the slot, it needs to be bent into a certain shape by a forming device to be inserted into the slot of the stator. However, the current devices usually form and bend the insulating paper by 90 degrees. Due to the tension existing in the insulating paper itself, during the process of inserting the insulating paper into the slot, the insulating paper will open, and the opened part of the insulating paper will generate additional friction with the inner wall of the slot, resulting in an increase in the insertion resistance and further causing paper jams. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems in the related art to a certain extent.

[0005] According to an embodiment of the utility model, an insulating paper forming device is provided, which includes an inlet end, an outlet end, and a conveying track located between the inlet end and the outlet end. The insulating paper forming device further includes:

[0006] A paper feeding wheel, located on the conveying track, for conveying the insulating paper;

[0007] A curling part, arranged near the inlet end, for bending two overlapping edges of the insulating paper;

[0008] A pressing part, located downstream of the curling part along the conveying direction of the insulating paper. The pressing part and the paper feeding wheel cooperate with each other to press the overlapping edges of the bent insulating paper, so that the two overlapping edges of the insulating paper respectively fit the two long edges of the insulating paper;

[0009] An edge expanding part, located downstream of the pressing part along the conveying direction of the insulating paper, for expanding the edge of the insulating paper that has been pressed, so that the two overlapping edges that fit the long edges of the insulating paper expand away from the long edges of the insulating paper by a preset angle;

[0010] The closing die is located downstream of the flanging component along the conveying direction of the insulating paper and close to the outlet end. A slot for the insulating paper to pass through is provided on the closing die, and a boss is provided inside the slot. The boss protrudes towards the inside of the slot and is used to narrow the two long sides of the insulating paper during the process of the insulating paper passing through the slot.

[0011] In some embodiments, the size of the end of the slot close to the flanging component is larger than the size of the end of the slot close to the outlet end, and the boss is transitionally arranged inside the end of the slot close to the outlet end.

[0012] In some embodiments, the edge pressing component includes two bearings, and the two bearings are symmetrically arranged on both sides of the conveying track. In the direction perpendicular to the conveying direction of the insulating paper, each bearing is spaced from the paper feeding wheel by a preset gap.

[0013] In some embodiments, the insulating paper forming device further includes a base, and the edge pressing component further includes two bearing brackets. Each bearing bracket includes a first end and a second end. The first end is fixed on the base, and the second end is fixedly connected to the corresponding bearing.

[0014] In some embodiments, the curling component includes two curling pieces, and the two curling pieces are symmetrically arranged on both sides of the conveying track. Each curling piece includes a groove, and the groove extends along a first direction. In the first direction, the height of one side of the groove gradually decreases, and the height of the other side of the groove gradually increases.

[0015] In some embodiments, the groove is opened on the bottom of the curling piece close to one side of the curling piece, and the height of the side of the groove close to the side of the curling piece gradually increases.

[0016] In some embodiments, the flanging component includes a central part and a cover plate. The central part is arranged on the conveying track. At least part of the central part has a height adapted to the long side of the insulating paper and has a width adapted to the overlap of the insulating paper in the direction perpendicular to the conveying direction of the insulating paper. The cover plate is located above at least part of the central part, and the cover plate is spaced from the top of at least part of the central part by a preset distance.

[0017] In some embodiments, the central part includes an end close to the edge pressing component, and the end is set to be arc-shaped and adapted to the outer peripheral surface of the paper feeding wheel for abutting against the paper feeding wheel.

[0018] In some embodiments, the central member includes an extension portion extending away from the end portion. The extension portion has a height adapted to the long side of the insulating paper and a width adapted to the overlap of the insulating paper in a direction perpendicular to the conveying direction of the insulating paper. The cover plate is located above the extension portion.

[0019] In some embodiments, the end portion of the central member and the extension portion are connected by an arc transition.

[0020] In some embodiments, the slotted opening includes opposite first inner side portions and second inner side portions, and bosses are provided at portions of the first inner side portion and the second inner side portion close to the outlet end.

[0021] The utility model presses the edge of the insulating paper that has been bent by setting a pressing edge component, so that the overlap can be further bent to 0 degrees and conveyed to the edge expanding component along the conveying track in this posture, so as to expand the two overlaps of the insulating paper bent to 0 degrees by a preset angle. In this way, it can be ensured that the insulating paper finally enters the slots of the stator core at a suitable angle. Finally, through the closing die with a slotted opening, the long side of the insulating paper is narrowed. The insulating paper processed by the insulating paper forming device of the utility model can be smoothly inserted into the slots of the stator core and be at 90 degrees in the slots, which well solves the problem of excessive resistance when the existing insulating paper is inserted into the slots.

[0022] The additional aspects and advantages of the utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the utility model. Description of the Drawings

[0023] Other features and advantages of the utility model are described below, which more specifically explains the utility model based on the embodiments in conjunction with the drawings.

[0024] Figure 1 A top view of an insulating paper forming device shown according to an embodiment of the utility model;

[0025] Figure 2 A partial structural schematic diagram of an insulating paper forming device shown according to an embodiment of the utility model;

[0026] Figure 3 The state of the overlap of the insulating paper shown according to an embodiment of the utility model Figure 1 ;

[0027] Figure 4 The state of the overlap of the insulating paper shown according to an embodiment of the utility model Figure 2 ;

[0028] Figure 5Schematic structural diagram of a bearing bracket shown according to an embodiment of the present utility model;

[0029] Figure 6 It is Figure 5 top view of;

[0030] Figure 7 Schematic structural diagram of a first curling part shown according to an embodiment of the present utility model;

[0031] Figure 8 It is Figure 7 side view of;

[0032] Figure 9 Schematic structural diagram of a second curling part shown according to an embodiment of the present utility model;

[0033] Figure 10 It is Figure 9 side view of;

[0034] Figure 11 Partial schematic structural diagram of a flanging component shown according to an embodiment of the present utility model;

[0035] Figure 12 It is Figure 11 cross-sectional view of the central part in along line A-A;

[0036] Figure 13 Schematic structural diagram of a necking die shown according to an embodiment of the present utility model;

[0037] Figure 14 It is Figure 13 rear view of;

[0038] Figure 15 It is Figure 13 front view of.

[0039] Explanation of reference numerals:

[0040] 100, insulating paper forming device; 110, inlet end; 120, outlet end; 130, conveying track; 140, paper feeding wheel; 150, curling component; 151, curling part; 1511, first curling part; 1512, second curling part; 152, groove; 153, bottom; 160, edge pressing component; 161, bearing; 162, bearing bracket; 1621, first end; 1622, second end; 170, flanging component; 171, central part; 1711, end; 1712, extension part; 1713, top; 172, cover plate; 173, fixing part; 180, necking die; 181, slot; 1811, first inner part; 1812, second inner part; 1813, boss; 190, base; 200, insulating paper; 210, overlap; 220, long side. Detailed implementation manners

[0041] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower", "left", "right", "front", "rear" and similar expressions used herein are for illustrative purposes only and are not limitations on the present utility model.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0043] Since in the traditional insulating paper forming device, when the two overlapping edges of the insulating paper are bent at 90 degrees, the insulating paper is inserted into the slots of the stator core. Under the action of its internal stress, the insulating paper will expand outwards, resulting in a posture where the two overlapping edges are greater than 90 degrees when the insulating paper is inserted into the slots, thus causing too large an insertion resistance. Specifically, the resistance between the two long edges of the insulating paper and the slots increases. To solve the above problems, the present utility model provides an insulating paper forming device.

[0044] As Figure 1 shown, the insulating paper forming device 100 according to the present utility model includes an inlet end 110, an outlet end 120, and a conveying track 130 located between the inlet end 110 and the outlet end 120. The insulating paper 200 enters the insulating paper forming device 100 from the inlet end 110 and is sent out of the insulating paper forming device 100 from the outlet end 120. The insulating paper forming device 100 further includes a paper feeding wheel 140, a curling member 150, a pressing edge member 160, a flanging member 170, and a closing die 180.

[0045] Among them, the paper feeding wheel 140 is located on the conveying track 130 and is used for conveying the insulating paper 200. The curling member 150 is arranged near the inlet end 110 and is used for bending the two overlapping edges 210 of the insulating paper 200. At this time, the curling member 150 forms and bends the insulating paper 200 into approximately 90 degrees. After the curling member 150 bends the insulating paper 200, due to the tension existing in the insulating paper 200 itself, the insulating paper 200 will open. As Figure 3 shown, the two overlapping edges 210 of the insulating paper 200 may open in a direction away from the long edge 220 of the insulating paper 200, that is, in the direction of the arrow in Figure 3 . It should be noted that the insulating paper has been indentation processed before entering the curling member 150. The pressing edge member 160 is along the conveying direction a of the insulating paper 200 (i.e., Figure 1The arrow a in) is located downstream of the hemming member 150. The hemming member 160 and the paper feed wheel 140 cooperate with each other to perform hemming on the overlap 210 of the bent insulating paper 200, so that the two overlaps 210 of the insulating paper 200 are respectively attached to the two long sides 220 of the insulating paper 200. Specifically, as Figure 4 shown, the two overlaps 210 of the insulating paper 200 are respectively pressed toward the long side 220 along the arrow direction and finally attached to the corresponding long side 220 (that is, the included angle between the overlap 210 and the long side 220 is approximately 0 degrees). The edge expanding member 170 is located downstream of the hemming member 160 along the conveying direction of the insulating paper 200 and is used to perform edge expanding on the insulating paper 200 that has been hemmed, so that the two overlaps 210 attached to the long side 220 of the insulating paper 200 are expanded by a preset angle in a direction away from the long side 220 of the insulating paper 200. The closing die 180 is located downstream of the edge expanding member 170 along the conveying direction of the insulating paper and is close to the outlet end 120. The closing die 180 is provided with a slot 181 for the insulating paper 200 to pass through. A boss 1813 is provided inside the slot 181, and the boss 1813 protrudes toward the inside of the slot 181 and is used to narrow the two long sides 220 of the insulating paper 200 during the process of the insulating paper 200 passing through the slot 181.

[0046] In the above implementation process, by setting the hemming member to perform hemming on the bent insulating paper, the overlap can be further bent to 0 degrees and conveyed to the edge expanding member along the conveying track in this posture, so as to expand the two overlaps of the insulating paper bent to 0 degrees by a preset angle. In this way, it can be ensured that the insulating paper finally enters the slot of the stator core at an appropriate angle. Finally, through the closing die provided with a slot, the long side of the insulating paper is narrowed. The insulating paper processed by the insulating paper forming device of the present invention can be smoothly inserted into the slot of the stator core and be at 90 degrees in the slot, which well solves the problem of excessive resistance when the existing insulating paper is inserted into the slot.

[0047] In some embodiments, such as Figures 13 - 15As shown, the dimension A1 of the slot 181 near the end of the flanging member 170 is greater than the dimension A2 of the slot 181 near the end of the outlet end 120. Specifically, a boss 1813 is gradually formed on the inner side of the slot 181. In one example, the cross-section of the slot 181 near the end of the flanging member 170 is rectangular, and a boss 1813 is provided on the inner side of the end of the slot 181 near the outlet end 120. Specifically, the slot 181 includes opposite first inner side 1811 and second inner side 1812, and bosses 1813 are provided on the portions of the first inner side 1811 and the second inner side 1812 near the outlet end 120. That is to say, the portions of the first inner side 1811 and the second inner side 1812 near the flanging member 170 are flat planes (i.e., the cross-section of the slot 181 near the end of the flanging member 170 is rectangular), and bosses 1813 are gradually formed on the first inner side 1811 and the second inner side 1812. This can ensure that the insulating paper smoothly enters the slot 181. After entering the slot 181, the two long sides 220 are gradually narrowed by the bosses 1813, avoiding the blockage of the insulating paper during the process of narrowing the two long sides 220.

[0048] In some embodiments, referring to Figure 1 and Figure 2 , the edge pressing member 160 includes two bearings 161, and the two bearings 161 are symmetrically arranged on both sides of the conveying track 130, that is, the two bearings 161 are located on both sides of the paper feeding wheel 140. In the direction perpendicular to the conveying direction of the insulating paper (i.e., Figure 1 the direction shown by the arrow b in Figure 1 ), each bearing 161 is spaced from the paper feeding wheel 140 by a preset gap. The insulating paper 200 conveyed to the edge pressing member 160, under the combined action of the bearings and the paper feeding wheel 140, the two overlapping edges 210 of the insulating paper and the corresponding long sides 220 are respectively located within the preset gap, and the width of the preset gap is equal to or greater than the sum of the thicknesses of the overlapping edge 210 and the long side 220. Among them, the bearings can convey the insulating paper forward together with the paper feeding wheel, thereby avoiding damaging the insulating paper during the edge pressing process of the insulating paper.

[0049] In some embodiments, referring to Figure 1 and Figure 2 , the insulating paper forming device 100 according to the present invention further includes a base 190, and the edge pressing member 160 further includes two bearing brackets 162. Combining Figures 5 - 6 , each bearing bracket 162 includes a first end 1621 and a second end 1622. The first end 1621 is fixed on the base 190, and the second end 1622 is fixedly connected to the corresponding bearing 161. In one example, both the first end 1621 and the second end 1622 can be fixedly connected by means of bolts or screws and nuts.

[0050] In some embodiments, referring toFigure 1 , the hemming member 150 includes two hemming parts 151. The two hemming parts 151 are symmetrically arranged on both sides of the conveying track 130, that is, the two hemming parts 151 are located on both sides of the paper feeding wheel 140. Each hemming part 151 includes a groove 152, and the groove 152 extends along the first direction c (as shown by the direction of the arrow c in Figure 7 and Figure 9 ). In the first direction, the height H1 of one side of the groove 152 gradually decreases, and the height H2 of the other side of the groove 152 gradually increases. Through this setting, the overlap of the insulating paper entering the hemming member can gradually fit the long side along the first direction, that is, after the hemming part 151 is installed in place, the first direction c is parallel to the conveying direction of the insulating paper.

[0051] Specifically, the two hemming parts 151 are respectively a first hemming part 1511 located on one side of the conveying track 130 and a second hemming part 1512 located on the other side of the conveying track 130. As shown in Figure 7 and Figure 10 , the grooves 152 of the first hemming part 1511 and the second hemming part 1512 are symmetrically arranged so that the two hemming parts can be symmetrically arranged on both sides of the conveying track 130. Since the grooves 152 of the first hemming part 1511 and the second hemming part 1512 are only symmetrically arranged, but the structures are the same, therefore, taking the groove 152 of the first hemming part 1511 as an example, specifically as shown in Figure 7 , in a specific example, the groove 152 is opened at the bottom 153 of the first hemming part 1511 near one side of the first hemming part 1511, and the height H2 of the side of the groove 152 near the side of the first hemming part 1511 gradually increases. After the first hemming part 1511 is arranged in place, the groove 152 is arranged close to the conveying track 130, and the insulating paper 200 can pass through the groove to realize the overlap of the insulating paper fitting the long side.

[0052] In some embodiments, as shown in Figure 2 , the edge expanding member 170 includes a central member 171 and a cover plate 172. The central member 171 is arranged on the conveying track 130. Combining with Figure 11 and Figure 12 , at least a part of the central member 171 has a height h adapted to the long side of the insulating paper, and has a width adapted to the overlap of the insulating paper in the direction b perpendicular to the conveying direction of the insulating paper. The cover plate 172 is at least located above a part of the central member 171, and the cover plate 172 is spaced from the top of the part of the central member 171 by a preset distance. The overlap 210 can pass through the preset distance and expand by a preset angle in the direction away from the long side 220 within the preset distance.

[0053] Specifically, as shown in Figure 2 and Figure 12As shown, the central member 171 includes an end 1711 near the hemming member 160. The central member 171 includes an extension 1712 extending away from the end 1711. The extension 1712 has a height h adapted to the long side of the insulating paper and has a width adapted to the overlap 210 of the insulating paper in the direction b perpendicular to the conveying direction of the insulating paper. The cover plate 172 is located above the extension 1712. The cover plate 172 is spaced from the top of the extension 1712 by a preset distance. The overlap 210 can pass through this preset distance and expand by a preset angle in the direction away from the long side 220 within this preset distance.

[0054] In some embodiments, as Figure 2 and Figure 12 shown, the end 1711 of the central member 171 is provided as an arc adapted to the outer peripheral surface of the paper feed wheel 140 for abutting against the paper feed wheel 140. In one example, the top 1713 of the central member 171 is fixed to the base 190. Specifically, as Figure 2 and Figure 11 shown, the top 1713 of the central member 171 is fixedly connected to the base 190 through a fixing member 173.

[0055] In some embodiments, the end 1711 and the extension 1712 of the central member 171 are connected by an arc transition. This setting can prevent damage to the insulating paper during the transition from the end of the central member to the extension. In addition, setting the radian of the arc facilitates the unfolding of the overlap of the insulating paper.

[0056] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0058] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0059] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. An insulating paper forming device, comprising an inlet end (110), an outlet end (120) and a conveying track (130) located between the inlet end (110) and the outlet end (120), characterized in that: The insulating paper forming device also includes: A paper feeding wheel (140), located on the conveying track (130), and used for conveying insulating paper (200); A curling component (150) is arranged close to the inlet end (110) and is used to perform a bending process on two overlapping edges (210) of the insulating paper (200); A pressing component (160) is located downstream of the curling component (150) along the conveying direction of the insulating paper (200), and the pressing component (160) cooperates with the paper feeding wheel (140) to perform a pressing process on the overlapping edges (210) of the insulating paper (200) that has been bent, so that the two overlapping edges (210) of the insulating paper (200) are respectively attached to the two long edges (220) of the insulating paper (200); An edge expansion component (170) is located downstream of the edge pressing component (160) along the conveying direction of the insulating paper (200), and is used to expand the edge of the insulating paper (200) that has been edge pressed, so that two overlapping edges (210) that are in contact with the long edge (220) of the insulating paper (200) expand at a preset angle in a direction away from the long edge (220) of the insulating paper (200); A closing die (180) is located downstream of the expanding component (170) and close to the outlet end (120) along the conveying direction of the insulating paper (200). A slot (181) is provided on the closing die (180). A boss (1813) is provided on the inner side of the slot (181). The boss (1813) protrudes toward the inside of the slot (181) and is used to narrow the two long sides (220) of the insulating paper (200) when the insulating paper (200) passes through the slot (181).

2. The insulating paper forming device according to claim 1, characterized in that: The edge holding component (160) comprises two bearings (161), and the two bearings (161) are symmetrically arranged on both sides of the conveying track (130), and in a direction perpendicular to the conveying direction of the insulating paper (200), each of the bearings (161) is spaced apart from the paper feeding wheel (140) by a preset gap.

3. The insulating paper forming device according to claim 2, characterized in that: It also includes a base, and the edge pressing component (160) also includes two bearing supports (162), each of the bearing supports (162) includes a first end (1621) and a second end (1622), the first end (1621) is fixed on the base, and the second end (1622) is fixedly connected to the corresponding bearing (161).

4. The insulating paper forming device according to claim 1, characterized in that: The curling component (150) comprises two curling pieces (151), the two curling pieces (151) are symmetrically arranged on both sides of the conveying track (130), each curling piece (151) comprises a groove (152), the groove (152) extends along a first direction, and in the first direction, the height of one side of the groove (152) gradually decreases, and the height of the other side of the groove (152) gradually increases.

5. The insulating paper forming device according to claim 4, characterized in that: The groove (152) is opened at the bottom (153) of the curling piece (151) close to a side edge of the curling piece (151), and the height of the side edge of the groove (152) close to the side edge of the curling piece (151) gradually increases.

6. The insulating paper forming device according to claim 1, characterized in that: The dimension of the end of the slot (181) close to the edge expansion component (170) is greater than the dimension of the end of the slot (181) close to the outlet end (120), and the boss (1813) is transitionally arranged on the inner side of the end of the slot (181) close to the outlet end (120).

7. The insulating paper forming device according to claim 1, characterized in that: The edge expansion component (170) includes a center piece (171) and a cover plate (172), wherein the center piece (171) is arranged on the conveying track (130), and at least a portion of the center piece (171) has a height that matches the long side (220) of the insulating paper (200), and has a width that matches the overlap (210) of the insulating paper (200) in a direction perpendicular to the conveying direction of the insulating paper (200), and the cover plate (172) is located at least above a portion of the center piece (171), and the cover plate (172) is spaced a preset distance from the top of the portion of the center piece (171).

8. The insulating paper forming device according to claim 7, characterized in that: The center piece (171) includes an end portion (1711) close to the edge pressing component (160), and the end portion (1711) is configured to be in an arc shape adapted to the outer peripheral surface of the paper feeding wheel (140) and is used to resist the paper feeding wheel (140).

9. The insulating paper forming device according to claim 8, characterized in that: The center piece (171) includes an extension portion (1712) extending away from the end portion (1711), the extension portion (1712) has a height that matches the long side (220) of the insulating paper (200), and has a width that matches the overlap (210) of the insulating paper (200) in a direction perpendicular to the conveying direction of the insulating paper (200), and the cover plate (172) is located above the extension portion (1712).

10. The insulating paper forming device according to claim 9, characterized in that: The end portion (1711) of the center piece (171) and the extension portion (1712) are connected via an arc transition.

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