Extension device and rolling die cutting equipment

Abstract

The utility model belongs to the technical field of foil die cutting, and discloses an extension device and rolling die cutting equipment. The extension device can roll and extend the foil, the foil comprises a dressing part and at least one blank part, and the at least one blank part is located on at least one side of the dressing part. The rolling device comprises a transition roller and an extension structure, the extension structure comprises at least one extension assembly, the periphery of the transition roller is sleeved with the at least one extension assembly, the dressing part abuts against the transition roller, and the at least one blank part abuts against the at least one extension assembly correspondingly; in one extension assembly, the diameter of the extension assembly is gradually reduced in the direction away from the dressing part. According to the device, through the arrangement of the extension structure, it can be guaranteed that wrinkles cannot occur when the transition roller rolls the blank part, and therefore the flatness is guaranteed. The extension device is applied to the rolling equipment, and the qualified rate of the foil can be guaranteed. The extension device is applied to the rolling die cutting equipment, and the production efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production equipment, in particular to an extension device and a roller die-cutting device. Background Art

[0002] With the development of technology, the energy storage industry has higher and higher requirements for battery capacity. More capacity is needed under the same size shell. At the same time, car companies have higher and higher requirements for the energy density of batteries. High energy density corresponds to longer battery life.

[0003] If you want to increase the capacity and energy density of the battery, you must compact the pole piece to ensure that the pole piece compaction density can be increased under the same surface density and space conditions, thereby increasing the capacity and energy density. However, when compacting the pole piece, due to the different extensions of the dressing part and the blank part of the foil, wrinkles appear on the edges of the blank part and the dressing part, which is not conducive to the subsequent pole piece die-cutting; in more serious cases, the belt will break during rolling, affecting production efficiency and causing unnecessary waste.

[0004] Therefore, there is an urgent need for an extension device and a rolling die-cutting device that can avoid wrinkles in the blank part and the dressing part when the foil is rolled, thereby avoiding a low yield rate in the die-cutting process and a decrease in production efficiency. Utility Model Content

[0005] One purpose of the utility model is to provide an extension device, so as to solve the problem that wrinkles are easily generated in the blank part and the dressing part when the foil is rolled.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A stretching device capable of rolling and stretching a foil material, wherein the foil material comprises a dressing portion and at least one blank portion, wherein the at least one blank portion is located on at least one side of the dressing portion, and the stretching device comprises:

[0008] Transition roller;

[0009] The extension structure includes at least one extension component, at least one of the extension components is sleeved on the outer circumference of the transition roller, the dressing part abuts against the transition roller, and at least one of the blank parts abuts against at least one of the extension components accordingly; in one of the extension components, the diameter of the extension component gradually decreases in the direction away from the dressing part.

[0010] Preferably, the extension assembly comprises a plurality of extension pieces, and the plurality of extension pieces are stacked along the thickness direction thereof; the plurality of extension pieces are flush on a side close to the dressing portion, and are stepped on a side away from the dressing portion, and the width of the extension pieces gradually increases in a direction close to the transition roller; the blank portion abuts against the extension piece at the top.

[0011] Preferably, the extension component is clamped with the transition roller so that the extension component is connected end to end and is fixed in a ring shape on the outer periphery of the transition roller.

[0012] Preferably, a snap-in hole is provided on the outer periphery of the transition roller, and a snap-in portion is provided on the extension piece at the bottom end, and the snap-in portion is snap-connected to the snap-in hole accordingly. A plurality of snap-in holes are provided at intervals along the axial direction of the transition roller, and at least two snap-in portions 241 are provided.

[0013] Preferably, the plurality of extension pieces are bonded and fixed to each other, and the clamping portion is bonded to the extension piece at the bottom end to be integrally formed or separately formed.

[0014] Preferably, the plurality of extension pieces are all rectangular and are made of flexible material.

[0015] Preferably, a blank portion is respectively provided on both sides of the dressing portion; the extension structure comprises a first extension component and a second extension component, the first extension component and the second extension component are arranged at an axial interval along the transition roller, the bottom surface of the dressing portion abuts against the top surface of the transition roller between the first extension component and the second extension component, the two side surfaces of the dressing portion abut against one side surface of the first extension component and one side surface of the second extension component respectively, and the bottom surfaces of the blank portions on both sides of the dressing portion abut against the top surface of the first extension component and the top surface of the second extension component respectively.

[0016] Preferably, the extension structure further comprises a third extension component, wherein the third extension component is arranged between the first extension component and the second extension component, and the diameter of the third extension component gradually decreases from both ends to the middle.

[0017] Preferably, both ends of the transition roller along the axial direction are provided with connecting pieces, and the connecting pieces are integrally formed with the transition roller or are separately provided.

[0018] Another object of the utility model is to provide a rolling die-cutting device to solve the problem of low yield rate during foil die-cutting.

[0019] To achieve this purpose, the utility model adopts the following technical solutions:

[0020] A rolling die-cutting device comprises a transmission device, a rolling device, a die-cutting device and an extending device, wherein the rolling device is used to roll the foil material, the transmission device is provided at both ends of the rolling device, the transmission device is used to transmit the foil material, the extending device is provided downstream of the rolling device, and is used to roll and extend the foil material passing through the rolling device; the die-cutting device is provided downstream of the extending device, and is used to die-cut the foil material after rolling and extending.

[0021] Beneficial effects of the utility model:

[0022] The stretching device of the utility model can roll the dressing part of the foil by setting a transition roller, so as to ensure the flatness of the dressing part. In addition, the stretching structure includes at least one stretching component, at least the stretching component is sleeved on the outer periphery of the transition roller, the dressing part abuts against the transition roller, and at least one blank part abuts against at least one stretching component; in one of the stretching components, the diameter of the stretching component gradually decreases in the direction away from the dressing part. This structure makes the extrusion force on the blank part gradually transmitted and dispersed along with the stretching structure when rolling the dressing part, ensuring that it will not wrinkle, thereby ensuring the flatness of the blank part and the dressing part, reducing the risk of broken tape and die-cutting scrap caused by foil wrinkles, and improving the pole piece qualification rate and production efficiency.

[0023] The utility model also provides a rolling die-cutting device, which can improve the yield rate of foil die-cutting while ensuring that wrinkles will not appear during the rolling process by applying the above-mentioned extension device, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the extension device provided by the utility model. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of the extension device provided by the utility model. Figure 2 ;

[0026] Figure 3 It is an axonometric view of the extension device provided by the utility model;

[0027] Figure 4 It is a structural schematic diagram of the foil material provided by the utility model;

[0028] Figure 5 It is a structural schematic diagram of the transition roller provided by the utility model;

[0029] Figure 6 It is a structural schematic diagram of the extension sheet provided by the utility model.

[0030] In the figure:

[0031] 10. Transition roller; 11. Snap-on hole;

[0032] 20. extension structure; 21. first extension assembly; 22. second extension assembly; 23. third extension assembly; 24. extension piece; 241. clamping part;

[0033] 30. Connectors;

[0034] 40. foil; 41. dressing portion; 42. blank portion. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] The present embodiment provides a rolling die-cutting device, which includes a transmission device, a rolling device, a die-cutting device and an extending device. The rolling device is used to preliminarily roll the foil 40. Transmission devices are provided at both ends of the rolling device, and the transmission devices are used to transmit the foil 40. The extending device is provided between the transmission devices at both ends and downstream of the rolling device, and is used to roll and extend the foil 40 passing through the rolling device; the die-cutting device is provided between the transmission devices at both ends and downstream of the extending device, and is used to die-cut the foil 40 after rolling and extending.

[0040] However, in the prior art, the stretching device may cause wrinkles on the dressing portion 41 and the blank portion 42 during the rolling process of the foil 40, which may result in a low yield rate during the die-cutting process, thereby reducing the overall production efficiency.

[0041] The technical solution of the extension device in the present invention will be further explained below with reference to the accompanying drawings and through specific implementation methods.

[0042] like Figure 1 and Figure 3 As shown, the stretching device is capable of rolling and stretching the foil 40, the foil 40 includes a dressing portion 41 and at least one blank portion 42, at least one blank portion 42 is located on at least one side of the dressing portion 41, the stretching device includes a transition roller 10 and an stretching structure 20, the stretching structure 20 includes at least one stretching component, at least one stretching component is sleeved on the outer periphery of the transition roller 10, the dressing portion 41 abuts against the transition roller 10, and at least one blank portion 42 abuts against at least one stretching component correspondingly; in one stretching component, the diameter of the stretching component gradually decreases in the direction away from the dressing portion 41.

[0043] The stretching device in this embodiment can roll the dressing portion 41 of the foil 40 by setting a transition roller 10, so as to ensure the flatness of the dressing portion 41. In addition, at least one group of stretching components are arranged at intervals on the outer periphery of the transition roller 10, and when the dressing portion 41 abuts against the transition roller 10, the blank portion 42 can abut against the stretching components accordingly, and the diameter of the stretching components gradually decreases in the direction away from the dressing portion 41, so that when rolling the dressing portion 41, the extrusion force on the blank portion 42 will be gradually transmitted and dispersed along with the stretching components, ensuring that it will not wrinkle, thereby ensuring the flatness of the blank portion 42 and the dressing portion 41, reducing the risk of broken tape and die-cutting scrap caused by wrinkles in the foil 40, and improving the pole piece qualification rate and production efficiency. Figure 6 As shown, the extension assembly includes an extension piece 24, and multiple extension pieces 24 are stacked along the thickness direction; the multiple extension pieces 24 are flush on the side close to the dressing portion 41, and are stepped on the side away from the dressing portion 41, and the width of the extension piece 24 gradually increases in the direction close to the transition roller 10; the blank portion 42 abuts against the extension piece 24 at the top. Figure 6As shown in B, multiple extension pieces 24 are stacked along the thickness direction and the multiple extension pieces 24 on the side close to the dressing portion 41 are flush. This arrangement can ensure that when the dressing portion 41 abuts against the transition roller 10, the side of the dressing portion 41 can abut against the flush side of the multiple extension pieces 24, thereby ensuring that during the rolling process, the dressing portion 41 will not be subjected to uneven force and wrinkles will not appear; in addition, the multiple extension pieces 24 are arranged in a stepped shape on the side away from the dressing portion 41, which can ensure that after the blank portion 42 is subjected to the extrusion force transmitted from the dressing portion 41 during the rolling process, the force on the blank portion 42 can be transmitted and dispersed layer by layer, thereby ensuring that it will not wrinkle.

[0044] Considering that it is inconvenient to directly process the extension component on the periphery of the transition roller 10, Figure 5 and Figure 6 As shown, the extension assembly is clamped with the transition roller 10, so that the extension assembly is connected end to end and is annularly fixed on the outer periphery of the transition roller 10. This structure can process the transition roller 10 and the extension assembly separately, thereby simplifying the processing flow and achieving the purpose of reducing costs.

[0045] In this embodiment, if Figure 5 and Figure 6 As shown in A, the outer periphery of the transition roller 10 is provided with a snap-in hole 11, and the extension piece 24 at the bottom end is provided with a snap-in portion 241, which can be snap-in to the snap-in hole 11, and the snap-in holes 11 are arranged at intervals along the axial direction of the transition roller 10, and at least two snap-in portions 241 are arranged. By setting the snap-in portion 241 at the bottom end of the extension piece 24 and arranging the multiple snap-in holes 11 at intervals along the axial direction of the transition roller 10, it is possible to adjust the position of the extension component on the transition roller 10 according to the actual width of the dressing portion 41, thereby adjusting the spacing between the multiple extension components to adapt to the actual width of the dressing portion 41, thereby ensuring the rolling extension effect, which is simple, convenient and efficient; at least two snap-in portions 241 are provided, which can also ensure a firm snap-in effect; in addition, by selecting to set multiple snap-in holes 11 on the transition roller 10 instead of setting multiple snap-in portions 241 on the transition roller 10, it is possible to ensure that the transition roller 10 will not interfere with the foil 40, thereby ensuring a good use effect.

[0046] It is worth noting that, in this embodiment, in order to prevent the extension component from falling off the transition roller 10, the clamping portion 241 is set in an "arrow" shape, and after extending into the clamping hole 11, the "arrow" shaped clamping joint can abut against the inside of the transition roller 10, thereby forming a good clamping effect. In other embodiments, other connection methods, such as threaded connection, etc., can also be selected, as long as the detachable connection between the extension 24 and the transition roller 10 can be guaranteed, and no other restrictions are made in this embodiment. It is further explained that in other embodiments, the number of clamping portions 241 can also be selected according to actual needs, as long as a stable clamping effect can be guaranteed, and no other restrictions are made in this embodiment.

[0047] Considering that it is not easy to install if multiple extension pieces 24 are in a circular ring, Figure 6 As shown in Figure B, multiple extension pieces 24 are all rectangular and made of flexible materials. Multiple extension pieces 24 are bonded and fixed to each other, and the clamping portion 241 is integrally formed with the bottom extension piece 24 or separately arranged. Rectangular extension pieces 24 are easier to process than circular ring-shaped ones. When in use, according to the actual width of the dressing portion 41, a clamping hole 11 with a suitable position is selected, one of the clamping portions 241 is clamped into the clamping hole 11, and multiple extension pieces 24 are stacked by external force to form an extension assembly and bent into a circular ring shape, and are wound around the outer periphery of the transition roller 10. After the extension piece 24 surrounds the transition roller 10 for one circle, another clamping portion 241 is correspondingly clamped into another clamping hole 11, thereby completing the installation, which is simple and convenient, and the operation is efficient.

[0048] Embodiment 1

[0049] It is worth noting that the foil 40 has Figure 4 The two structures shown in Figures A and B are as follows. Figure 1 The extension device shown can be used to Figure 4 The foil material 40 in B (in the foil material 40 , one dressing portion 41 is provided, and two blank portions 42 are provided and are respectively located on both sides of the dressing portion 41 ) is rolled and stretched.

[0050] The extension structure 20 includes a first extension component 21 and a second extension component 22. The first extension component 21 and the second extension component 22 are arranged at intervals along the axial direction of the transition roller 10. The bottom surface of the dressing portion 41 abuts against the top surface of the transition roller 10 between the first extension component 21 and the second extension component 22. The two side surfaces of the dressing portion 41 abut against one side surface of the first extension component 21 and one side surface of the second extension component 22 respectively. The bottom surfaces of the blank portions 42 on both sides of the dressing portion 41 abut against the top surface of the first extension component 21 and the top surface of the second extension component 22 respectively.

[0051] This arrangement can place the bottom surface of the dressing portion 41 between the first extension component 21 and the second extension component 22, the side surfaces of the dressing portion 41 respectively abut against the side surfaces of the first extension component 21 and the second extension component 22, and the bottom surface of the blank portion 42 respectively abuts against the top ends of the first extension component 21 and the second extension component 22, thereby ensuring that the foil 40 can be rolled as a whole, and the extrusion force on the blank portion 42 can be gradually transmitted and dispersed to ensure that it will not wrinkle, thereby ensuring the flatness of the blank portion 42 and the dressing portion 41, reducing the risk of broken tape and die-cutting scrap caused by wrinkles in the foil 40, and improving the electrode qualification rate and production efficiency.

[0052] It is worth noting that, in this embodiment, the width of each layer of the plurality of rectangular extension pieces 24 increases by 5 mm to 10 mm from the top to the bottom, the plurality of extension pieces 24 have the same length, the thickness of each extension piece 24 is between 20 μm and 30 μm, and the number of layers bonded from the top to the bottom is approximately 2 to 5. It is further noted that, in this embodiment, Figure 4 The single-sided thickness of the dressing portion 41 of the foil material 40 of B is 91 microns, the width of the dressing portion 41 is 191 mm, the width of the blank portions 42 on the left and right sides is 70 mm, and an extension piece 24 with a width of 30 mm and a single piece thickness of 30 microns is selected as the bottom extension piece 24, and a single piece with a width of 25 mm and a single piece thickness of 30 microns is used as the second layer extension piece 24, and a single piece with a width of 20 mm and a single piece thickness of 30 microns is selected as the top extension piece 24, and then bonded to form the first extension component 21 and the second extension component 22. In other embodiments, the single width, thickness and number of layers of the extension piece 24 can be specifically adjusted according to actual conditions.

[0053] Embodiment 2

[0054] Considering that there are Figure 4 The foil material 40 of the structure shown in A has two dressing parts 41 and three blank parts 42. A blank part 42 is respectively provided on both sides of any dressing part 41. Considering that the blank part 42 in the middle cannot be smoothly extended by only the first extension component 21 and the second extension component 22, Figure 2 As shown, the extension structure 20 further includes a third extension component 23, which is disposed between the first extension component 21 and the second extension component 22, and the diameter of the third extension component 23 gradually decreases from both ends to the middle.

[0055] By arranging the third extension component 23 between the first extension component 21 and the second extension component 22, Figure 4In A, the bottom surface of the dressing portion 41 on the left side abuts against the top surface of the transition roller 10 between the first extension component 21 and the third extension component 23, and the two side surfaces of the dressing portion 41 on the left side abut against the side surfaces of the first extension component 21 and the third extension component 23 respectively; the bottom surface of the dressing portion 41 on the right side abuts against the top surface of the transition roller 10 between the third extension component 23 and the second extension component 22, and the two side surfaces of the dressing portion 41 on the right side abut against the side surfaces of the third extension component 23 and the second extension component 22 respectively; the bottom surface of the blank portion 42 on the left side abuts against the top surface of the first extension component 21, the bottom surface of the blank portion 42 on the right side abuts against the top surface of the second extension component 22, and the bottom surface of the blank portion 42 in the middle abuts against the top surface of the third extension component 23. This structure can ensure that when the left and right dressing parts 41 are rolled, the extrusion pressure on the left and right blank parts 42 can extend along the two ends, and the extrusion pressure on the middle blank part 42 can be transmitted from the two ends to the middle, thereby ensuring that the middle blank part 42 is subjected to uniform force, thereby avoiding wrinkles and ensuring its flatness.

[0056] It is worth noting that since the third extension component 23 is also formed by bonding multiple extension pieces 24 along the thickness direction, its connection method is the same as that of the first extension component 21 and the second extension component 22, and will not be repeated here. It is further noted that in this embodiment, multiple rectangular extension pieces 24 increase in width by 5 mm to 10 mm per layer from top to bottom, multiple extension pieces 24 have the same length, and each extension piece 24 has a thickness of 20 μm to 30 μm, and the number of layers bonded from top to bottom is approximately 2 to 5 layers. It is further noted that in this embodiment, Figure 4 The single-sided thickness of the dressing part 41 of the foil material 40 of A is 91 microns, the width of the dressing part 41 is 191 mm, the width of the blank parts 42 on the left and right sides is 35 mm, and the width of the blank part 42 in the middle is 70 mm. An extension piece 24 with a width of 30 mm and a single piece thickness of 30 microns is selected as the bottom extension piece 24, and a single piece extension piece 24 with a width of 25 mm and a single piece thickness of 30 microns is used as the second layer extension piece 24. An extension piece 24 with a width of 20 mm and a single piece thickness of 30 microns is selected as the top extension piece 24, and then bonded to form the first extension component 21 and the second extension component 22. In other embodiments, the single width, thickness and number of layers of the extension piece 24 can be specifically adjusted according to actual conditions. The third extension component 23 is formed by bonding two components respectively in the above manner, and the stepped ends thereof are placed opposite to each other and bonded to form the third extension component 23.

[0057] Finally, in order to facilitate the setting of the modification and extension device, a connecting piece 30 is provided at both ends of the transition roller 10 along its axial direction, and the connecting piece 30 and the transition roller 10 are integrally formed or separately provided. This arrangement can facilitate processing, thereby reducing processing costs, and can also facilitate the setting of the modification and extension device at the corresponding workstation, thereby improving the practicality of the device.

[0058] Combine the following Figure 1-Figure 3 Describe the use process of this utility model:

[0059] First of all, Figure 4 When the foil material 40 of structure A is rolled and stretched, the following method is used: Figure 2 The extension device shown places the left dressing part 41 between the first extension component 21 and the third extension component 23, and places the right dressing part 41 between the second extension component 22 and the third extension component 23, so that the blank parts 42 in the left, middle and right parts are respectively abutted against the first extension component 21, the second extension component 22 and the third extension component 23, so that the dressing part 41 is rolled respectively, and the extrusion force on the dressing part 41 is transmitted to the blank part 42, and then the extrusion force on the blank part 42 is transmitted and dispersed layer by layer, so as to ensure that the blank part 42 will not have wrinkles, thereby facilitating the subsequent die-cutting work.

[0060] Secondly, if Figure 4 When the foil material 40 of structure B is rolled and stretched, the following method is used: Figure 1 The extending device shown places the dressing portion 41 between the first extending component 21 and the second extending component 22, and makes the blank portions 42 on the left and right sides abut against the first extending component 21 and the second extending component 22 respectively, so as to roll the dressing portion 41 respectively, and transmit the extrusion force exerted on the dressing portion 41 to the blank portion 42, thereby making the extrusion force exerted on the blank portion 42 be transmitted and dispersed layer by layer, thereby ensuring that the blank portion 42 will not have wrinkles, thereby facilitating the subsequent die-cutting work.

[0061] In summary, the use of the stretching device provided by the present invention can ensure that no wrinkles appear when the foil 40 is rolled, thereby ensuring that the roll-pressing die-cutting equipment provided by the present invention has a high yield.

[0062] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A stretching device capable of rolling and stretching a foil (40), wherein the foil (40) comprises a dressing portion (41) and at least one blank portion (42), wherein at least one blank portion (42) is located on at least one side of the dressing portion (41), characterized in that: The extending device comprises: Transition roller (10); The extension structure (20) comprises at least one extension component, at least one of the extension components is sleeved on the outer circumference of the transition roller (10), the dressing portion (41) is in contact with the transition roller (10), and at least one of the blank portions (42) is in corresponding contact with at least one of the extension components; in one of the extension components, the diameter of the extension component gradually decreases in a direction away from the dressing portion (41).

2. The stretching device according to claim 1, characterized in that: The extension component comprises a plurality of extension pieces (24), wherein the plurality of extension pieces (24) are stacked along the thickness direction thereof; the plurality of extension pieces (24) are flush on a side close to the dressing portion (41), and are stepped on a side away from the dressing portion (41), and the width of the extension pieces (24) gradually increases in a direction close to the transition roller (10); and the blank portion (42) abuts against the extension piece (24) at the top.

3. The stretching device according to claim 2, characterized in that: The extension component is clamped with the transition roller (10) so that the extension component is connected end to end and is fixed in a ring shape on the outer periphery of the transition roller (10).

4. The stretching device according to claim 3, characterized in that: The outer periphery of the transition roller (10) is provided with a snap-in hole (11), and the extension piece (24) located at the bottom end is provided with a snap-in portion (241), and the snap-in portion (241) is snap-into the snap-in hole (11) correspondingly, and a plurality of the snap-in holes (11) are arranged at intervals along the axial direction of the transition roller (10), and at least two of the snap-in portions (241) are provided.

5. The stretching device according to claim 4, characterized in that: The plurality of extension pieces (24) are bonded and fixed to each other, and the clamping portion (241) and the bottom extension piece (24) are integrally formed or separately arranged.

6. The stretching device according to claim 4, characterized in that: The plurality of extension pieces (24) are all rectangular and made of flexible material.

7. The stretching device according to any one of claims 1 to 6, characterized in that: A blank portion (42) is respectively provided on both sides of the dressing portion (41); the extension structure (20) comprises a first extension component (21) and a second extension component (22), the first extension component (21) and the second extension component (22) are arranged at intervals along the axial direction of the transition roller (10), the bottom surface of the dressing portion (41) abuts against the top surface of the transition roller (10) between the first extension component (21) and the second extension component (22), the two side surfaces of the dressing portion (41) abut against one side surface of the first extension component (21) and one side surface of the second extension component (22), and the bottom surfaces of the blank portions (42) on both sides of the dressing portion (41) abut against the top surface of the first extension component (21) and the top surface of the second extension component (22).

8. The stretching device according to claim 7, characterized in that: The extension structure (20) further comprises a third extension component (23), wherein the third extension component (23) is arranged between the first extension component (21) and the second extension component (22), and the diameter of the third extension component (23) gradually decreases from both ends to the middle.

9. The stretching device according to any one of claims 1 to 6, characterized in that: Connecting pieces (30) are provided at both ends of the transition roller (10) along its axial direction; the connecting piece (30) and the transition roller (10) are integrally formed or separately provided.

10. A roller die cutting device, characterized in that: It comprises a transmission device, a rolling device, a die-cutting device and an extension device as described in any one of claims 1 to 9, wherein the rolling device is used to roll the foil (40), the transmission devices are arranged at both ends of the rolling device, the transmission device is used to transmit the foil (40), the extension device is arranged downstream of the rolling device, and is used to roll and extend the foil (40) passing through the rolling device; the die-cutting device is arranged downstream of the extension device, and is used to die-cut the foil (40) after rolling and extending.

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