Sheet bending jig

By designing a piece-body bending fixture with a hinged handle and a push-top structure, the processing limitations caused by the fixed position of the existing FPC bending fixture is solved, and the flexible bending and portable use of FPC is achieved.

CN222706711UActive Publication Date: 2025-04-01SUNWODA ELECTRONICS CO LTD
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Patent Information

Application Number
CN202420875932.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-22
Publication Date
2025-04-01
Estimated Expiration
2034-04-22

AI Technical Summary

Technical Problem

The fixed position of the existing FPC bending fixtures leads to greater processing limitations and it is difficult to adapt to complex installation environments.

Method used

A piece-body bending fixture is designed, including the first and second handles articulatedly connected, accommodating space and a push-top structure, which pushes the FPC to bending through the fitting and separation state changes of the handle.

Benefits of technology

It realizes flexible bending processing of FPC, reduces processing limitations, and makes the sheet bending fixture more portable and versatile.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a sheet bending jig, comprising: a first handle and a second handle, the first handle and the second handle are hingedly connected and have a fitted state and a separated state; a containing space, arranged between the first handle and the second handle; a first push-up structure, arranged on the first handle, when the first handle and the second handle are in the fitted state, the end of the first push-up structure away from the first handle is overlapped with the second handle and forms a first forming space between the second handle. The technical solution of the application effectively solves the problem that the position of the bending jig in the related art is fixed, which makes the PFC bending process more limited.
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Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a sheet bending jig. Background Art

[0002] FPC stands for Flexible Printed Circuit Board, which is an electronic circuit board using polyimide film or polyester film as the substrate. Unlike traditional circuit boards, FPC is highly flexible and bendable, can adapt to complex installation environments, and provides greater freedom for the design and manufacture of electronic equipment.

[0003] In the related art, the FPC needs to be bent and connected to the battery cell. The FPC is bent using a bending jig. The bending jig has a large structure and is fixed, which results in a relatively fixed processing position, which in turn results in greater processing limitations. Utility Model Content

[0004] The main purpose of the utility model is to provide a sheet bending jig to solve the problem that the position of the bending jig in the related art is fixed, which makes the PFC bending process more limited.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a sheet bending jig, including: a first handle and a second handle, the first handle and the second handle are hingedly connected and have a fitted state and a separated state; a accommodating space, arranged between the first handle and the second handle; a first pushing structure, arranged on the first handle, when the first handle and the second handle are in the fitted state, the end of the first pushing structure away from the first handle is overlapped with the second handle and forms a first molding space between the second handle.

[0006] Furthermore, a first guide groove is provided on the first handle, the first guide groove extends along the length direction of the first handle, and the first ejection structure is movably provided on the first guide groove along the first guide groove.

[0007] Furthermore, the first ejection structure includes a connecting frame and an ejection column, the ejection column is connected to the end of the connecting frame facing the second handle, and the axis of the ejection column is parallel to the surface of the first handle provided with the first ejection structure.

[0008] Furthermore, the ejection column is rotatably arranged relative to the connecting frame.

[0009] Furthermore, the sheet bending jig also includes a second pushing structure arranged on the second handle. When the first handle and the second handle are in a fitted state, the end of the second pushing structure away from the second handle is overlapped with the first handle and forms a second molding space between the first handle.

[0010] Furthermore, a second guide groove is provided on the second handle, and the second ejection structure is movably provided on the second guide groove along the second guide groove.

[0011] Furthermore, the sheet bending jig also includes a first protection pad and a second protection pad, the first protection pad is arranged on a side of the first handle provided with the first pushing structure, and the second protection pad is arranged on a side of the second handle provided with the second pushing structure.

[0012] Furthermore, the sheet bending jig also includes a support member, which is arranged along the length direction of the first handle. A plurality of positioning grooves are arranged at intervals on the side of the accommodating space, and the support member can be selectively inserted into one of the plurality of positioning grooves.

[0013] Furthermore, the sheet bending jig also includes a first elastic member, which is arranged in the accommodating space and cooperates with the support member to apply an elastic force to the support member toward a side of the first handle provided with the first pushing structure.

[0014] Furthermore, the sheet bending jig further includes a magnetic structure, which is disposed between the first handle and the second handle, and / or the sheet bending jig further includes a second elastic member, which is disposed between the first handle and the second handle.

[0015] Furthermore, a first groove is provided on a side of the first handle away from the second handle, a second groove is provided on a side of the second handle away from the first handle, and / or the sheet bending jig also includes a fixing belt and a fixing block, one of the fixing belt and the fixing block is provided on the first handle and located on a side of the first handle away from the first pushing structure, and the other of the fixing belt and the fixing block is provided on the second handle and located on a side of the second handle away from the first pushing structure, wherein both ends of the fixing belt are fixedly provided, and an insertion space is formed between the middle portion of the fixing belt and the first handle or the second handle.

[0016] By applying the technical solution of the utility model, the first handle and the second handle are hingedly connected and have a fitting state and a separation state, the accommodating space is arranged between the first handle and the second handle, and the first push-up structure is arranged on the first handle. When the first handle and the second handle are in the fitting state, the end of the first push-up structure away from the first handle is overlapped with the second handle and forms a first forming space between the second handle. Through the above-mentioned arrangement, the accommodating space can accommodate the FPC, and part of the structure of the FPC extends out of the first handle. When the first handle and the second handle move from the separation state to the fitting state, the first push-up structure can push the FPC extending out of the first handle, and the FPC extending out of the first handle is accumulated in the first forming space, so that the FPC can be bent. At the same time, since the sheet bending jig is a handheld structure, it is more convenient to carry, and thus the use of the sheet bending jig can be made more convenient. Therefore, the technical solution of the present application effectively solves the problem that the position of the bending jig in the related art is fixed, which makes the PFC bending processing more limited. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application 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 an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a sheet bending jig according to the utility model is shown;

[0019] Figure 2 Shows Figure 1 A partial enlarged view of the A part of the sheet bending fixture;

[0020] Figure 3 Shows Figure 1 Schematic diagram of the exploded structure of the sheet bending jig;

[0021] Figure 4 Shows Figure 3 A partial enlarged view of location B of the sheet bending jig;

[0022] Figure 5 Shows Figure 1 A schematic diagram of the three-dimensional structure of the sheet bending jig from another perspective;

[0023] Figure 6 Shows Figure 1 A schematic top view of a sheet bending jig;

[0024] Figure 7 Shows Figure 6 A schematic cross-sectional view in the CC direction of the sheet bending jig;

[0025] Figure 8 Shows Figure 6 A schematic cross-sectional view in the DD direction of the sheet bending jig;

[0026] Fig. 9 Shows Figure 6 EE-direction cross-sectional schematic diagram of the sheet bending jig;

[0027] Fig.10 Shows Figure 1 Schematic diagram of the bottom view of the sheet bending fixture.

[0028] The above drawings include the following reference numerals:

[0029] 10. First handle; 11. First guide groove; 12. First groove; 20. Second handle; 21. Second guide groove; 22. Second groove; 30. Accommodating space; 31. Positioning groove; 40. First ejection structure; 41. Connecting frame; 42. Ejection column; 50. Second ejection structure; 61. First protection pad; 62. Second protection pad; 71. Support member; 72. First elastic member; 80. Magnetic structure; 91. Fixing belt; 92. Fixing block; 100. Second elastic member. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0033] like Figures 1 to 3 as well as Figure 5 and Figure 6 As shown, in this embodiment, the sheet bending jig includes: a first handle 10, a second handle 20, a receiving space 30 and a first push-up structure 40. The first handle 10 and the second handle 20 are hingedly connected and have a fitted state and a separated state. The receiving space 30 is arranged between the first handle 10 and the second handle 20. The first push-up structure 40 is arranged on the first handle 10. When the first handle 10 and the second handle 20 are in the fitted state, the end of the first push-up structure 40 away from the first handle 10 is overlapped with the second handle 20 and forms a first molding space between the second handle 20.

[0034] By applying the technical solution of this embodiment, the first handle 10 and the second handle 20 are hingedly connected and have a fitted state and a separated state, the accommodating space 30 is arranged between the first handle 10 and the second handle 20, and the first push-up structure 40 is arranged on the first handle 10. When the first handle 10 and the second handle 20 are in the fitted state, the end of the first push-up structure 40 away from the first handle 10 is overlapped with the second handle 20 and forms a first forming space between the second handle 20. Through the above arrangement, the accommodating space 30 can accommodate the FPC, and part of the structure of the FPC extends out of the first handle 10. When the first handle 10 and the second handle 20 move from the separated state to the fitted state, the first push-up structure 40 can push the FPC extending out of the first handle 10, and accumulate the FPC extending out of the first handle 10 in the first forming space, so that the FPC can be bent. At the same time, since the sheet bending jig is a handheld structure, it is more convenient to carry, and thus the sheet bending jig can be more convenient to use. Therefore, the technical solution of this embodiment effectively solves the problem in the related art that the position of the bending jig is fixed, which causes great limitations in the PFC bending process.

[0035] like Figures 1 to 3 as well as Figure 6 As shown, in this embodiment, a first guide groove 11 is provided on the first handle 10, and the first guide groove 11 extends along the length direction of the first handle 10, and the first push-up structure 40 is movably provided on the first guide groove 11 along the first guide groove 11. The provision of the first guide groove 11 can fix the moving direction of the first push-up structure 40, and at the same time, since the first push-up structure 40 can move in the first guide groove 11, the position of the first push-up structure 40 can be adjusted, and then the first push-up structure 40 can realize the processing of sheets of different sizes, thereby effectively improving the versatility of the sheet bending jig.

[0036] like Figures 1 to 3 as well as Figure 6 As shown, in this embodiment, the first push-up structure 40 includes a connecting frame 41 and a push-up column 42, the push-up column 42 is connected to the end of the connecting frame 41 facing the second handle 20, and the axis of the push-up column 42 is parallel to the surface of the first handle 10 provided with the first push-up structure 40. The setting of the connecting frame 41 can effectively fix the push-up column 42, and the push-up column 42 can squeeze the sheet body, thereby realizing bending the sheet body. Specifically, the push-up column 42 is a cylinder, so that the contact area between the sheet body and the push-up column 42 is small, so that it is easier for the push-up column 42 to push the sheet body.

[0037] Specifically, Figures 1 to 3 as well as Figure 6 As shown, the connecting frame 41 includes a first connecting seat, a second connecting seat, a first connecting plate and a second connecting plate, the first connecting plate is connected to the first connecting seat, the second connecting plate is connected to the second connecting seat, the first connecting seat is provided with a first connecting hole, the second connecting seat is provided with a second connecting hole, the ejection column 42 is connected between the first connecting plate and the second connecting plate, the first fastener is inserted into the first connecting hole and the first guide groove 11, and the second fastener is inserted into the second connecting hole and the first guide groove 11. In this way, the position of the connecting frame 41 can be more stable and the position of the ejection column 42 can be more stable.

[0038] like Figures 1 to 3 as well as Figure 6 As shown, in this embodiment, the ejector pin 42 is rotatably arranged relative to the connecting frame 41. The above arrangement makes the contact between the ejector pin 42 and the sheet body rolling friction, which can further reduce the friction resistance, thereby making the sheet body easier to shape.

[0039] like Figures 1 to 3 as well as Figure 6As shown, in this embodiment, the sheet bending jig further includes a second push-up structure 50 disposed on the second handle 20. When the first handle 10 and the second handle 20 are in a fitted state, the end of the second push-up structure 50 away from the second handle 20 is overlapped with the first handle 10 and forms a second molding space with the first handle 10. The second push-up structure 50 can also push the sheet, so that under the action of the first push-up structure 40 and the second push-up structure 50, the sheet can be bent in multiple directions, thereby achieving the bending process of the sheet.

[0040] like Figures 1 to 3 as well as Figure 6 As shown, in this embodiment, the second handle 20 is provided with a second guide groove 21, and the second push-up structure 50 is movably provided on the second guide groove 21. The provision of the second guide groove 21 can make the movement of the second push-up structure 50 more stable and the direction more fixed.

[0041] Specifically, the second ejecting structure 50 also includes a connecting frame and an ejecting column. The structures of the connecting frame and the ejecting column of the second ejecting structure 50 are the same as those of the connecting frame and the ejecting column of the first ejecting structure 40.

[0042] like Figures 1 to 3 as well as Figures 6 to 9 As shown, in this embodiment, the sheet bending jig further includes a first protection pad 61 and a second protection pad 62, wherein the first protection pad 61 is disposed on a side of the first handle 10 provided with the first push-up structure 40, and the second protection pad 62 is disposed on a side of the second handle 20 provided with the second push-up structure 50. The provision of the first protection pad 61 and the second protection pad 62 can effectively protect the bent sheet, prevent the sheet from hard contact with the first handle 10 or the second handle 20, and avoid damage to the sheet.

[0043] like Figure 3 , Figure 4 as well as Figures 6 to 9 As shown, in this embodiment, the sheet bending jig further includes a support member 71, which is arranged along the length direction of the first handle 10, and a plurality of positioning grooves 31 are arranged at intervals on the side of the accommodating space 30, and the support member 71 can be selectively inserted into one of the plurality of positioning grooves 31. The arrangement of the support member 71 can support the sheet, thereby making the position of the sheet more stable. At the same time, since a plurality of positioning grooves 31 are arranged, the support member 71 can be selectively inserted into one of the plurality of positioning grooves 31, so that the sheet bending jig can support sheets of different sizes, thereby improving the versatility of the sheet bending jig.

[0044] It should be noted that, in this embodiment, the support member 71 is a support plate. The side portions of the aforementioned accommodation space 30 refer to the two ends along the length direction of the first handle 10 .

[0045] like Figure 3 , Figure 4 as well as Figures 6 to 9 As shown, in this embodiment, the sheet bending jig further includes a first elastic member 72, which is disposed in the accommodating space 30 and supported and matched with the support member 71, and the first elastic member 72 applies an elastic force to the support member 71 toward the side of the first handle 10 where the first push-up structure 40 is disposed. The provision of the first elastic member 72 can make the position of the support member 71 more stable, that is, under the action of the first elastic member 72, the support member 71 can be abutted and matched with the groove wall of the positioning groove 31.

[0046] Specifically, in this embodiment, the first elastic member 72 is located on a side of the support member 71 away from the first pushing structure 40 .

[0047] like Figure 3 As shown, in this embodiment, the sheet bending jig further includes a magnetic structure 80, which is disposed between the first handle 10 and the second handle 20. The arrangement of the magnetic structure 80 enables the first handle 10 and the second handle 20 to be kept in a fitted position.

[0048] like Figure 3 As shown, in this embodiment, the sheet bending jig further includes a second elastic member 100, which is disposed between the first handle 10 and the second handle 20. The second elastic member 100 can make the first handle 10 and the second handle 20 easier to open, that is, easier to move to a separated state.

[0049] Specifically, a receiving hole is provided on the side of the first handle 10 facing the second handle 20, the second elastic member 100 is inserted into the receiving hole, a positioning column is provided on the bottom wall of the receiving hole, and the second elastic member 100 is sleeved on the positioning column. The magnetic structure 80 and the second elastic member 100 are arranged at intervals, and the distance between the second elastic member 100 and the hinge of the first handle 10 and the second handle 20 is smaller than the distance between the magnetic structure 80 and the hinge of the first handle 10 and the second handle 20.

[0050] like Figure 1 and Figure 5 As shown, in this embodiment, a first groove 12 is provided on a side of the first handle 10 away from the second handle 20, and a second groove 22 is provided on a side of the second handle 20 away from the first handle 10. The arrangement of the first groove 12 and the second groove 22 can make it easier to operate when held in hand.

[0051] like Figure 3 , Figure 5 as well as Fig.10As shown, in this embodiment, the sheet bending jig further includes a fixing belt 91 and a fixing block 92, one of which is arranged on the first handle 10 and located on the side of the first handle 10 away from the first push-up structure 40, and the other of which is arranged on the second handle 20 and located on the side of the second handle 20 away from the first push-up structure 40, wherein both ends of the fixing belt 91 are fixedly arranged, and an insertion space is formed between the middle of the fixing belt 91 and the first handle 10 or the second handle 20. The hand can be inserted into the insertion space, thereby making the sheet bending jig not easy to fall, and the setting of the fixing block 92 can make it easier to drive the first handle 10 and the second handle 20 to be in a separated state.

[0052] Specifically, the fixing block 92 is disposed on the first handle 10, the fixing belt 91 is disposed on the second handle 20, the first groove 12 and the fixing block 92 are located on different surfaces of the first handle 10, and the second groove 22 and the fixing belt 91 are located on different surfaces of the second handle 20. The surface of the first handle 10 on which the fixing block 92 is disposed and the surface of the second handle 20 on which the fixing belt 91 is disposed are located on the same side of the first groove 12.

[0053] The fixing block 92 and the first guide groove 11 are located on two opposite surfaces of the first handle 10 .

[0054] Specifically, the use process of the sheet bending jig of this embodiment is as follows:

[0055] The position of the support member 71 is adjusted to meet the requirements of the sheet bending processing. The operator inserts his hand into the insertion space, and pushes the fixing block 92 with his fingers to place the first handle 10 and the second handle 20 in a separated position, and places the sheet in the accommodating space 30. The first handle 10 and the second handle 20 are driven to move to a fitted state. During the movement of the first handle 10 and the second handle 20, the first pushing structure 40 and the second pushing structure 50 can squeeze the sheet to bend the sheet, thereby completing the bending processing of the sheet.

[0056] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0057] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0058] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0059] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sheet bending jig, characterized in that: include: A first handle (10) and a second handle (20), wherein the first handle (10) and the second handle (20) are hingedly connected and have a fitted state and a separated state; An accommodating space (30) is provided between the first handle (10) and the second handle (20); A first pushing-up structure (40) is arranged on the first handle (10); when the first handle (10) and the second handle (20) are in the fitted state, an end of the first pushing-up structure (40) away from the first handle (10) is overlapped with the second handle (20) and a first molding space is formed between the end and the second handle (20).

2. The sheet bending jig according to claim 1, characterized in that: The first handle (10) is provided with a first guide groove (11), the first guide groove (11) extending along the length direction of the first handle (10), and the first ejection structure (40) is movably arranged on the first guide groove (11) along the first guide groove (11).

3. The sheet bending jig according to claim 1, characterized in that: The first ejection structure (40) comprises a connecting frame (41) and an ejection column (42), wherein the ejection column (42) is connected to the end of the connecting frame (41) facing the second handle (20), and the axis of the ejection column (42) is parallel to the surface of the first handle (10) on which the first ejection structure (40) is provided.

4. The sheet bending jig according to claim 3, characterized in that: The ejection column (42) is rotatably arranged relative to the connecting frame (41).

5. The sheet bending jig according to claim 1, characterized in that: The sheet bending jig further comprises a second pushing structure (50) arranged on the second handle (20); when the first handle (10) and the second handle (20) are in the fitted state, an end of the second pushing structure (50) away from the second handle (20) is overlapped with the first handle (10) and a second molding space is formed between the end and the first handle (10).

6. The sheet bending jig according to claim 5, characterized in that: The second handle (20) is provided with a second guide groove (21), and the second ejection structure (50) is movably arranged on the second guide groove (21) along the second guide groove (21).

7. The sheet bending jig according to claim 5, characterized in that: The sheet bending jig further comprises a first protection pad (61) and a second protection pad (62), wherein the first protection pad (61) is arranged on a side of the first handle (10) on which the first push-up structure (40) is arranged, and the second protection pad (62) is arranged on a side of the second handle (20) on which the second push-up structure (50) is arranged.

8. The sheet bending jig according to claim 1, characterized in that: The sheet bending jig further comprises a support member (71), wherein the support member (71) is arranged along the length direction of the first handle (10), and a plurality of positioning grooves (31) are arranged at intervals on the side of the accommodating space (30), and the support member (71) can be selectively inserted into one of the plurality of positioning grooves (31).

9. The sheet bending jig according to claim 8, characterized in that: The sheet bending jig further comprises a first elastic member (72), wherein the first elastic member (72) is disposed in the accommodating space (30) and is supported and cooperated with the supporting member (71), and the first elastic member (72) applies an elastic force to the supporting member (71) toward a side of the first handle (10) on which the first pushing structure (40) is disposed.

10. The sheet bending jig according to any one of claims 1 to 9, characterized in that: The sheet bending jig further comprises a magnetic structure (80), wherein the magnetic structure (80) is disposed between the first handle (10) and the second handle (20); and / or the sheet bending jig further comprises a second elastic member (100), wherein the second elastic member (100) is disposed between the first handle (10) and the second handle (20).

11. The sheet bending jig according to any one of claims 1 to 9, characterized in that: A first groove (12) is provided on a side of the first handle (10) away from the second handle (20), and a second groove (22) is provided on a side of the second handle (20) away from the first handle (10), and / or the sheet bending jig further comprises a fixing belt (91) and a fixing block (92), one of the fixing belt (91) and the fixing block (92) is provided on the first handle (10) and is located on a side of the first handle (10) away from the first pushing structure (40), and the other of the fixing belt (91) and the fixing block (92) is provided on the second handle (20) and is located on a side of the second handle (20) away from the first pushing structure (40), wherein both ends of the fixing belt (91) are fixedly provided, and an insertion space is formed between a middle portion of the fixing belt (91) and the first handle (10) or the second handle (20).