Corner protection paperboard and corner protection wrapping device

Abstract

The utility model provides a corner protection paperboard and a corner protection wrapping device, and relates to the technical field of wrapping equipment.The corner protection paperboard comprises a lower flattening part, a vertical supporting part A, an upper flattening part A, a first back-bending part A, a second back-bending part A, a vertical supporting part B, an upper flattening part B, a first back-bending part B and a second back-bending part B; the angle bead wrapping device comprises three driving mechanical arms, a first folding mold, a second folding mold and an upper folding mold, the first folding mold, the second folding mold and the upper folding mold are arranged on the three driving mechanical arms correspondingly, and the first folding mold and the second folding mold are arranged in a right-angle mode. The upper folding mold is located above the first folding mold and the second folding mold, and the first folding mold, the second folding mold and the upper folding mold are controlled by the driving mechanical arm to move in the vertical direction and the horizontal direction respectively, so that the photovoltaic module is wrapped with the corner protection paperboard in the flattened state.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wrapping equipment, and in particular to a corner protection paperboard, a corner protection wrapping device, and a wrapping method for the corner protection wrapping device. Background Art

[0002] In the photovoltaic module production line, when assembly is completed and before packaging, in order to prevent the photovoltaic modules from colliding with each other, they are often wrapped with corner protectors at the four corners and then packaged.

[0003] A prior art Chinese invention patent, publication number CN108128550A, discloses a cardboard foldable into a corner protector and a corner protector. The cardboard comprises two rows of sheets, namely a first row of sheets and a second row of sheets. The first row of sheets includes a first sheet, a second sheet, a third sheet, a fourth sheet, a fifth sheet, a sixth sheet, and a seventh sheet, and the second row of sheets includes an eighth sheet. Fold lines are formed between the sheets, and the sheets can be folded into a corner protector along the fold lines. The present invention also provides a corner protector folded from the cardboard, comprising a first wall surface, a second wall surface, and a third wall surface that are interconnected and perpendicular to each other, and the cross-section of the wall surfaces is a hollow rectangle. The invention uses the foldable cardboard to form a corner protector, which is used for transporting household appliances, electronic products, or other products, reducing transportation and storage space. The corner protector is recyclable and has good cushioning properties.

[0004] However, the corner protection paperboard in the prior art has a small covering surface and a low covering overlap, which cannot meet the requirements of the protection and operation of photovoltaic modules. Utility Model Content

[0005] A technical problem to be solved by the present disclosure is that the corner protection paperboard in the prior art has a small covering surface and a low covering overlap.

[0006] In order to solve the above technical problems, the embodiment of the present disclosure provides a corner guard paperboard, which includes a lower flattened portion, a vertical support portion A, an upper flattened portion A, a bend portion A, a bend portion A, a vertical support portion B, an upper flattened portion B, a bend portion B and a bend portion B. The lower flattened portion is provided with two adjacent right-angled sides, the vertical support portion A and the vertical support portion B are respectively vertically connected to the two right-angled sides of the lower flattened portion, the upper flattened portion A is vertically connected to the vertical support portion A, and the upper flattened portion B is vertically connected to the vertical support portion A. In the vertical support portion B, the bend portion 1A is vertically connected to the upper flattened portion A, the bend portion 1B is vertically connected to the upper flattened portion B, the bend portion 2A is vertically connected to the bend portion 1A, and the bend portion 2B is vertically connected to the bend portion 1B. A folding notch is provided between the vertical support portion A and the vertical support portion B. The lower flattened portion, the vertical support portion A, the upper flattened portion A, the bend portion 1A, the bend portion 2A, the vertical support portion B, the upper flattened portion B, the bend portion 1B and the bend portion 2B form an enclosing cavity.

[0007] In some embodiments, a first hem A is formed between the vertical support portion A and the lower flattening portion, a first hem B is formed between the vertical support portion B and the lower flattening portion, a second hem A is formed between the upper flattening portion A and the vertical support portion A, a second hem B is formed between the upper flattening portion B and the vertical support portion B, a third hem A is formed between the first bending portion A and the upper flattening portion A, a third hem B is formed between the first bending portion B and the upper flattening portion B, a fourth hem A is formed between the second bending portion A and the first bending portion A, and a fourth hem B is formed between the second bending portion B and the first bending portion B.

[0008] In some embodiments, the first hem A, the second hem A, the third hem A, and the fourth hem A are arranged in parallel with each other, and the first hem B, the second hem B, the third hem B, and the fourth hem B are arranged in parallel with each other.

[0009] In some embodiments, a triangular support portion is provided on the lower flattening portion.

[0010] The corner protection device includes a driving robotic arm, a first folding die, a second folding die, and an upper folding die. Three driving robotic arms are provided, and the first folding die, the second folding die, and the upper folding die are respectively arranged on the three driving robotic arms. The first folding die and the second folding die are arranged at a right angle, and the upper folding die is located above the first folding die and the second folding die.

[0011] In some embodiments, a first communicating air groove is provided inside the first folding die, a first communicating air nozzle is provided on the first folding die, the first communicating air nozzle and the first communicating air groove are in communication with each other. A second communicating air groove is provided inside the second folding die, a second communicating air nozzle is provided on the second folding die, the second communicating air nozzle and the second communicating air groove are in communication with each other. A third communicating air groove is provided inside the upper folding die, a third communicating air nozzle is provided on the upper folding die, the third communicating air nozzle and the third communicating air groove are in communication with each other. A negative pressure machine is included, and the negative pressure machine is connected to the first communicating air nozzle, the second communicating air nozzle, and the third communicating air nozzle.

[0012] In some embodiments, a first beveled edge portion is provided on one side of the first folding die close to the second folding die, and a second beveled edge portion is provided on one side of the second folding die close to the first folding die.

[0013] In some embodiments, a third beveled edge portion is provided at the position of the included angle of the upper folding die close to the first folding die and the second folding die.

[0014] Through the above technical solutions, the corner protection cardboard and the corner protection device provided by the present disclosure have the following

[0015] Beneficial effects:

[0016] First: The corner guard cardboard in this solution includes a lower flattened part, a vertical support part A, an upper flattened part A, a first bent-back part A, a second bent-back part A, a vertical support part B, an upper flattened part B, a first bent-back part B, and a second bent-back part B. The inner sides of the lower flattened part, the vertical support part A, the upper flattened part A, the first bent-back part A, the second bent-back part A, the vertical support part B, the upper flattened part B, the first bent-back part B, and the second bent-back part B form a covering cavity. When in use, the covering cavity on a single corner guard cardboard covers one corner of the photovoltaic module. One corner guard cardboard is provided at each of the four corners of a single photovoltaic module, so as to achieve a complete covering treatment of the corners of the photovoltaic module and improve the safety of the photovoltaic module during transportation.

[0017] Second: The corner guard device includes a driving robotic arm, which includes a first folding die, a second folding die, and an upper folding die. There are three driving robotic arms, and the first folding die, the second folding die, and the upper folding die are respectively arranged on the three driving robotic arms. The first folding die and the second folding die are arranged at a right angle, and the upper folding die is above the first folding die and the second folding die. By controlling the vertical movement and horizontal movement of the first folding die, the second folding die, and the upper folding die respectively through the driving robotic arms, the flattened corner guard cardboard can be covered at the four corners of the photovoltaic module.

[0018] Third: The negative pressure machine is connected to the first connecting air nozzle, the second connecting air nozzle, and the third connecting air nozzle. By setting the negative pressure machine, the first connecting air groove, the second connecting air groove, and the third connecting air groove are in a negative pressure state. Through the first connecting air groove, the second connecting air groove, and the third connecting air groove, the dust generated during the corner guarding process can be adsorbed and removed, so as to improve the covering cleanliness of the photovoltaic module and facilitate its subsequent processing operations. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the unfolded structure of the corner guard cardboard in the embodiment of the present disclosure;

[0021] Figure 2 It is a schematic diagram of the folding steps of the corner guard cardboard in the embodiment of the present disclosure;

[0022] Figure 3 It is a side view of the corner guard cardboard in the embodiment of the present disclosure;

[0023] Figure 4It is a schematic diagram of the cooperation state of four corner protection devices and a photovoltaic module in an embodiment of the present disclosure;

[0024] Figure 5 is Figure 4 an enlarged structural schematic diagram of part A in

[0025] Figure 6 It is a schematic diagram of the cooperation state of a corner protection device and a photovoltaic module in an embodiment of the present disclosure;

[0026] Figure 7 It is a schematic diagram when the corner protection device wraps the photovoltaic module in an embodiment of the present disclosure Figure One ;

[0027] Figure 8 It is a schematic diagram when the corner protection device wraps the photovoltaic module in an embodiment of the present disclosure Figure Two ;

[0028] Figure 9 It is a schematic diagram when the corner protection device wraps the photovoltaic module in an embodiment of the present disclosure Figure Three ;

[0029] Figure 10 It is a schematic diagram when the corner protection device wraps the photovoltaic module in an embodiment of the present disclosure Figure Four ;

[0030] Figure 11 It is a schematic diagram when the corner protection device wraps the photovoltaic module in an embodiment of the present disclosure Figure Five .

[0031] Explanation of reference numerals:

[0032] 1. Lower flattening part; 2. Vertical support part A; 3. Upper flattening part A; 4. First bending part A; 5. Second bending part A; 6. Vertical support part B; 7. Upper flattening part B; 8. First bending part B; 9. Second bending part B; 10. First folding edge A; 11. First folding edge B; 12. Second folding edge A; 13. Second folding edge B; 14. Third folding edge A; 15. Third folding edge B; 16. Fourth folding edge A; 17. Fourth folding edge B; 18. Support part; 19. First folding die; 191. First communicating air groove; 192. First communicating air nozzle; 20. First bevel edge part; 21. Second folding die; 211. Second communicating air groove; 212. Second communicating air nozzle; 22. Second bevel edge part; 23. Upper folding die; 231. Third communicating air groove; 232. Third communicating air nozzle; 24. Third bevel edge part. Detailed implementation manners

[0033] The following further describes in detail the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description and drawings of the following examples are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but including all technical solutions falling within the scope of the claims.

[0034] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions and values set forth in these embodiments should be construed as merely exemplary, rather than as limitations.

[0035] It should be noted that in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality" is greater than or equal to two; the orientation or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0036] In addition, the "first", "second" and similar terms used in the present disclosure do not denote any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Words such as "including" or "comprising" mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements.

[0037] It should also be noted that in the description of the present disclosure, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations. When it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0038] All terms used in this disclosure have the same meanings as those understood by those of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, for example, should be interpreted to have meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such herein.

[0039] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and devices should be regarded as part of the specification.

[0040] As Figure 1-11 shown, the corner guard cardboard is used to wrap the four corners of the photovoltaic module. The corner guard cardboard includes a lower flattened portion 1, a vertical support portion A2, an upper flattened portion A3, a first bent-back portion A4, a second bent-back portion A5, a vertical support portion B6, an upper flattened portion B7, a first bent-back portion B8, and a second bent-back portion B9. The lower flattened portion 1 is provided with two adjacent right-angled sides. The vertical support portion A2 and the vertical support portion B6 are respectively vertically connected to the two right-angled sides of the lower flattened portion 1. The upper flattened portion A3 is vertically connected to the vertical support portion A2. The upper flattened portion B7 is vertically connected to the vertical support portion B6. The first bent-back portion A4 is vertically connected to the upper flattened portion A3. The first bent-back portion B8 is vertically connected to the upper flattened portion B7. The second bent-back portion A5 is vertically connected to the first bent-back portion A4. The second bent-back portion B9 is vertically connected to the first bent-back portion B8. A first fold A10 is formed between the vertical support portion A2 and the lower flattened portion 1. A first fold B11 is formed between the vertical support portion B6 and the lower flattened portion 1. A second fold A12 is formed between the upper flattened portion A3 and the vertical support portion A2. A second fold B13 is formed between the upper flattened portion B7 and the vertical support portion B6. A third fold A14 is formed between the first bent-back portion A4 and the upper flattened portion A3. A third fold B15 is formed between the first bent-back portion B8 and the upper flattened portion B7. A fourth fold A16 is formed between the second bent-back portion A5 and the first bent-back portion A4. A fourth fold B17 is formed between the second bent-back portion B9 and the first bent-back portion B8.

[0041] In some embodiments, an encapsulation cavity is formed inside the lower flattened portion 1, the vertical support portion A2, the upper flattened portion A3, the first bent-back portion A4, the second bent-back portion A5, the vertical support portion B6, the upper flattened portion B7, the first bent-back portion B8, and the second bent-back portion B9. During use, the encapsulation cavity on a single corner guard cardboard is used to wrap a corner of the photovoltaic module. One corner guard cardboard is respectively provided at each of the four corners of a single photovoltaic module, thereby achieving a complete wrapping treatment for the corners of the photovoltaic module and improving the safety of the photovoltaic module during transportation.

[0042] In some embodiments, a folding notch is provided between the vertical support portion A2 and the vertical support portion B6. The folding notch is exposed when the corner guard cardboard is in the unfolded state. When the corner guard cardboard is folded, the vertical support portion A2 and the vertical support portion B6 gather together. By providing the folding notch, the structural compactness of the corner guard cardboard can be improved.

[0043] In some embodiments, the first folding edge A10, the second folding edge A12, the third folding edge A14, and the fourth folding edge A16 are arranged in parallel with each other. The first folding edge B11, the second folding edge B13, the third folding edge B15, and the fourth folding edge B17 are arranged in parallel with each other. Among them, the first folding edge A10, the second folding edge A12, the third folding edge A14, and the fourth folding edge A16 are perpendicular to the first folding edge B11.

[0044] In some embodiments, the lower flattening portion 1 is provided with a triangular support portion 18. By providing the support portion 18, the contact between the corner guard cardboard and the photovoltaic module can be improved, thereby increasing the contact area between the corner guard cardboard and the photovoltaic module, and further improving the wrapping effect of the corner guard cardboard on the photovoltaic module.

[0045] Through the corner guard wrapping device, the corner guard cardboard can be folded and wrapped on the upper part. The corner guard wrapping device needs to be installed at the corners of the photovoltaic module. One corner guard wrapping device can perform the wrapping operation on one corner of the photovoltaic module. To improve efficiency, multiple corner guard wrapping devices can be used simultaneously in this solution to perform the wrapping operations on the four corners of the photovoltaic module at the same time. On this basis, the cost can also be reduced by setting a transmission component at the lower end of the photovoltaic module to drive the photovoltaic module to rotate step by step, and the corner guard wrapping device performs the wrapping operations on the four corners of the photovoltaic module one by one.

[0046] The corner guard wrapping device includes a driving robotic arm, which includes a first folding mold 19, a second folding mold 21, and an upper folding mold 23. There are three driving robotic arms. The first folding mold 19, the second folding mold 21, and the upper folding mold 23 are respectively arranged on the three driving robotic arms. The first folding mold 19 and the second folding mold 21 are arranged at a right angle, and the upper folding mold 23 is located above the first folding mold 19 and the second folding mold 21.

[0047] In some embodiments, a first communicating air groove 191 is provided on the inner side of the first folding mold 19, a first communicating air nozzle 192 is provided on the first folding mold 19, the first communicating air nozzle 192 and the first communicating air groove 191 are communicated with each other, a second communicating air groove 211 is provided on the inner side of the second folding mold 21, a second communicating air nozzle 212 is provided on the second folding mold 21, the second communicating air nozzle 212 and the second communicating air groove 211 are communicated with each other, a third communicating air groove 231 is provided on the inner side of the upper folding mold 23, a third communicating air nozzle 232 is provided on the upper folding mold 23, and the third communicating air groove 231 is provided on the inner side of the upper folding mold 23. The vent nozzle 232 and the third communicating air groove 231 are connected to each other, and include a negative pressure machine, which is connected to the first communicating air nozzle 192, the second communicating air nozzle 212 and the third communicating air nozzle 232. The negative pressure machine is set to ensure that the first communicating air groove 191, the second communicating air groove 211 and the third communicating air groove 231 are in a negative pressure state. When in use, the dust generated during the corner wrapping process can be adsorbed and removed through the first communicating air groove 191, the second communicating air groove 211 and the third communicating air groove 231, thereby improving the wrapping cleanliness of the photovoltaic module to facilitate subsequent processing operations.

[0048] In some embodiments, a first bevel portion 20 is provided on the side of the first folding mold 19 close to the second folding mold 21, and a second bevel portion 22 is provided on the side of the second folding mold 21 close to the first folding mold 19. The first bevel portion 20 and the second bevel portion 22 can facilitate the fit between the first folding mold 19 and the second folding mold 21 when they are close together, thereby preventing the first folding mold 19 and the second folding mold 21 from conflicting with each other and affecting the folding effect of the corner guard cardboard.

[0049] In some embodiments, a third bevel portion 24 is provided on the upper folding mold 23 at the angle between the first folding mold 19 and the second folding mold 21. The third bevel portion 24 can facilitate the fit of the upper folding mold 23 when folding the corner guard cardboard.

[0050] The corner protection method comprises the following steps:

[0051] like Figure 7 As shown, S1: Place the flat corner protector cardboard above the first folding mold 19 and the second folding mold 21, place the corner of the photovoltaic module on the corner protector cardboard, and control the upper folding mold 23 to be directly above the photovoltaic module by driving the robotic arm;

[0052] like Figure 8 As shown, S2: starting the driving robot arm to control the first folding mold 19 and the second folding mold 21 to move vertically upward, the first folding mold 19 moves upward to bend the corner paperboard along the first folding edge A10, and the second folding mold 21 moves upward to bend the corner paperboard along the first folding edge B11;

[0053] As Figure 9 shown, S3: Restart the driving robotic arm to control the first folding die 19 and the second folding die 21 to translate towards the photovoltaic module. By translating the first folding die 19, the corner guard cardboard is bent along the second fold line A12, and by translating the second folding die 21, the corner guard cardboard is bent along the second fold line B13;

[0054] As Figure 10 shown, S4: Start the driving robotic arm to control the upper folding die 23 to move vertically downward. By moving the upper folding die 23 downward, the corner guard cardboard is bent along the third fold line A14 and the third fold line B15;

[0055] As Figure 11 shown, S5: Restart the driving robotic arm to control the upper folding die 23 to translate towards the corner of the photovoltaic module. By translating the upper folding die 23, the corner guard cardboard is bent along the fourth fold line A16 and the fourth fold line B17.

[0056] In some embodiments, in steps S1 - S5, start the negative pressure machine, and the negative pressure machine makes the first communication air groove 191, the second communication air groove 211, and the third communication air groove 231 in a negative pressure state to suck the dust during the process of wrapping the corner guard.

[0057] Among them, the negative pressure machine maintains a negative pressure in the range of 2 - 20 kPa around the die during the folding process during the operation of the corner guard wrapping device, so as to effectively suck away the paper dust generated during the folding of the corner guard and keep the production process and the photovoltaic module clean.

[0058] So far, the embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed here based on the above description.

[0059] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for the purpose of illustration and not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way.

Claims

1. Corner guard cardboard, characterized in that, The corner guard cardboard includes a lower flattened portion (1), a vertical support portion A (2), an upper flattened portion A (3), a first bent-back portion A (4), a second bent-back portion A (5), a vertical support portion B (6), an upper flattened portion B (7), a first bent-back portion B (8), and a second bent-back portion B (9). The lower flattened portion (1) has two adjacent right-angled sides. The vertical support portion A (2) and the vertical support portion B (6) are respectively vertically connected to the two right-angled sides of the lower flattened portion (1). The upper flattened portion A (3) is vertically connected to the vertical support portion A (2). The upper flattened portion B (7) is vertically connected to the vertical support portion B (6). The first bent-back portion A (4) is vertically connected to the upper flattened portion A (3). The first bent-back portion B (8) is vertically connected to the upper flattened portion B (7). The second bent-back portion A (5) is vertically connected to the first bent-back portion A (4). The second bent-back portion B (9) is vertically connected to the first bent-back portion B (8). A folding notch is provided between the vertical support portion A (2) and the vertical support portion B (6). The inner sides of the lower flattened portion (1), the vertical support portion A (2), the upper flattened portion A (3), the first bent-back portion A (4), the second bent-back portion A (5), the vertical support portion B (6), the upper flattened portion B (7), the first bent-back portion B (8), and the second bent-back portion B (9) form a covering cavity.

2. The corner guard cardboard according to claim 1, wherein A first fold edge A (10) is formed between the vertical support portion A (2) and the lower flattened portion (1). A first fold edge B (11) is formed between the vertical support portion B (6) and the lower flattened portion (1). A second fold edge A (12) is formed between the upper flattened portion A (3) and the vertical support portion A (2). A second fold edge B (13) is formed between the upper flattened portion B (7) and the vertical support portion B (6). A third fold edge A (14) is formed between the first bent-back portion A (4) and the upper flattened portion A (3). A third fold edge B (15) is formed between the first bent-back portion B (8) and the upper flattened portion B (7). A fourth fold edge A (16) is formed between the second bent-back portion A (5) and the first bent-back portion A (4). A fourth fold edge B (17) is formed between the second bent-back portion B (9) and the first bent-back portion B (8).

3. The corner guard cardboard according to claim 2, wherein, The first fold edge A (10), the second fold edge A (12), the third fold edge A (14), and the fourth fold edge A (16) are arranged parallel to each other. The first fold edge B (11), the second fold edge B (13), the third fold edge B (15), and the fourth fold edge B (17) are arranged parallel to each other.

4. The corner guard cardboard according to claim 1, characterized in that, The lower flattened portion (1) is provided with a triangular support portion (18).

5. The corner protector device for folding the corner protector cardboard according to any one of claims 1-4, comprising a driving robotic arm, characterized in that, It includes a first folding die (19), a second folding die (21), and an upper folding die (23). There are three driving robotic arms. The first folding die (19), the second folding die (21), and the upper folding die (23) are respectively arranged on the three driving robotic arms. The first folding die (19) and the second folding die (21) are arranged at a right angle. The upper folding die (23) is located above the first folding die (19) and the second folding die (21).

6. The corner protection device according to claim 5, wherein The inner side of the first folding die (19) is provided with a first communicating air groove (191), the first folding die (19) is provided with a first communicating air nozzle (192), the first communicating air nozzle (192) and the first communicating air groove (191) communicate with each other, the inner side of the second folding die (21) is provided with a second communicating air groove (211), the second folding die (21) is provided with a second communicating air nozzle (212), the second communicating air nozzle (212) and the second communicating air groove (211) communicate with each other, the inner side of the upper folding die (23) is provided with a third communicating air groove (231), the upper folding die (23) is provided with a third communicating air nozzle (232), the third communicating air nozzle (232) and the third communicating air groove (231) communicate with each other, including a negative pressure machine which is connected to the first communicating air nozzle (....

7. The corner protection device according to claim 5, wherein, One side of the first folding die (19) close to the second folding die (21) is provided with a first bevel edge portion (20), and one side of the second folding die (21) close to the first folding die (19) is provided with a second bevel edge portion (22).

8. The corner protection device according to claim 5, characterized in that, One side of the upper folding die (23) close to the included angle position of the first folding die (19) and the second folding die (21) is provided with a third bevel edge portion (24).

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