Integrated processing equipment for porous aluminum current collector composite material

Abstract

The porous aluminum current collector composite material integrated machining equipment comprises a first unwinding device, second unwinding devices, a guiding device, an ultrasonic welding device, a pressing wheel and a punching device which are sequentially arranged in the discharging direction, and the two second unwinding devices are arranged on the upper side and the lower side of the first unwinding device correspondingly; a base material is arranged on the first unwinding device, the two groups of aluminum coils are respectively arranged on the two second unwinding devices, and the base material and the two groups of aluminum coils are respectively unwound and pass through the guide device; the rolling end of the ultrasonic welding device is connected with the rotating end of the guiding device through a first transmission structure so as to carry out pressure welding on the base material and the aluminum coil; the pressing wheel is connected with the rolling end of the ultrasonic welding device through a second transmission structure. The punching device is arranged on the side, away from the ultrasonic welding device, of the pressing wheel. Efficient integration of multiple procedures is achieved, and through linkage of the first transmission structure and the second transmission structure, the welding quality and the production efficiency are improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery material processing, and in particular to an integrated processing device for porous aluminum current collector composite materials. Background Art

[0002] With the rapid development of new energy vehicles, energy storage systems and other fields, the performance and cost control of lithium-ion batteries as the main energy storage device have become the focus of industry attention. As an important battery component, porous aluminum current collectors have been widely used in lithium-ion batteries due to their light weight, good conductivity and stability.

[0003] However, the preparation process of porous aluminum current collector is complicated. In order to improve production efficiency and reduce costs, integrated processing equipment has gradually become a research hotspot. In practical applications, this type of integrated equipment still has problems with the welding quality of current collector composite materials.

[0004] For example, existing integrated equipment usually integrates multiple processes, such as unwinding, welding, punching, etc. These integrated processes are mostly independent of each other. Therefore, in the actual preparation process, due to insufficient coordination and cooperation between different processes, the processing deviation will be amplified, and it is easy to have problems such as loose welding and uneven distribution of welds when welding composite materials, resulting in poor welding quality. Summary of the invention

[0005] The present application aims to solve one of the technical problems in the above-mentioned technology at least to some extent.

[0006] To achieve the above-mentioned purpose, the first aspect of the present application proposes an integrated processing equipment for porous aluminum collector composite materials, comprising: a first unwinding device, a second unwinding device, a guiding device, an ultrasonic welding device, a pressure wheel and a punching device arranged in sequence along the discharge direction, wherein the two second unwinding devices are respectively arranged on the upper and lower sides of the first unwinding device; a substrate is arranged on the first unwinding device, and two groups of aluminum coils are respectively arranged on the two second unwinding devices, and the substrate and the two groups of aluminum coils are respectively unwound through the guiding device and extend in the discharge direction; the rolling end of the ultrasonic welding device is connected to the rotating end of the guiding device through a first transmission structure to pressure weld the substrate and the aluminum coil; the pressure wheel is connected to the rolling end of the ultrasonic welding device through a second transmission structure; the punching device is arranged on the side of the pressure wheel away from the ultrasonic welding device.

[0007] In addition, the integrated processing equipment for the porous aluminum current collector composite material proposed in the present application may also have the following additional technical features:

[0008] As a further description of the above technical solution: the guiding device includes a first guiding roller, a second guiding roller, a first gear and a driving motor, wherein the first guiding roller and the second guiding roller are respectively arranged opposite to each other up and down; the two first gears are respectively coaxially connected to the first guiding roller and the second guiding roller, and mesh with each other; the output end of the driving motor is connected to the first guiding roller; wherein the aluminum coils unwound on the upper and lower sides are respectively guided by the first guiding roller and the second guiding roller, and the substrate passes between the two aluminum coils.

[0009] As a further description of the above technical solution: there are four ultrasonic welding devices, which are arranged opposite to each other on both sides of the aluminum coil, and the two ultrasonic welding devices on each side are arranged opposite to each other up and down.

[0010] As a further description of the above technical solution: the first guide roller and the second guide roller on the side away from the driving motor are respectively connected to the corresponding ultrasonic welding device through the first transmission structure, and the second guide roller on the side close to the driving motor is also connected to the corresponding ultrasonic welding device through the first transmission structure, and the rolling ends of the two ultrasonic welding devices on this side are respectively connected by two second gears.

[0011] As a further description of the above technical solution: the welding device includes a mounting frame, an ultrasonic generator, a transducer and a welding wheel, wherein the mounting frame is fixedly arranged on the outside of the aluminum coil; the transducer is arranged on the mounting frame; the ultrasonic generator is connected to one side of the transducer, and the welding wheel is rotatably connected to the other side of the transducer; wherein the welding wheel contacts the outer surface of the corresponding aluminum coil.

[0012] As a further description of the above technical solution: the number of the clamping wheels corresponds to the number of the ultrasonic welding devices one by one, and is connected to the rolling ends of the corresponding ultrasonic welding devices through a second transmission structure.

[0013] As a further description of the above technical solution: the punching device includes a fixed plate, a die table, a driving cylinder, a die and a stabilizing rod, wherein the fixed plate and the die table are respectively fixedly arranged on the outer sides of two groups of aluminum coils, and a plurality of die holes are opened on the die table; the driving cylinder is arranged on the fixed plate, and the telescopic end of the driving cylinder extends vertically downward; the die is arranged on the telescopic end of the driving cylinder, and a plurality of stamping columns are arranged on the die, and the plurality of stamping columns correspond one by one to the plurality of die holes; stabilizing rods are respectively arranged on both sides of the die, and the stabilizing rods vertically penetrate the fixed plate upward.

[0014] As a further description of the above technical solution: the first transmission structure and the second transmission structure both include two tensioning wheels and a synchronous belt, wherein the synchronous belt is sleeved outside the two tensioning wheels.

[0015] As a further description of the above technical solution: the first unwinding device and the second unwinding device both include a roller body and a driver, wherein the roller body is rotatably arranged on a corresponding frame body; the driver is arranged on the frame body and connected to the rotating end of the roller body.

[0016] According to the porous aluminum current collector composite material integrated processing equipment of the present application, by sequentially arranging the first unwinding device, the second unwinding device, the guiding device, the ultrasonic welding device, the pressure wheel and the punching device, efficient integration of multiple processes is achieved, and production efficiency is significantly improved; and the guiding device, the ultrasonic welding device and the pressure wheel are linked by the first transmission structure and the second transmission structure, thereby improving the coordination and synchronization effects of the processing process, reducing processing deviations, and improving welding quality and production efficiency.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 is a schematic structural diagram of an integrated processing device for a porous aluminum current collector composite material according to an embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the internal structure of a porous aluminum current collector composite material integrated processing device according to an embodiment of the present application;

[0021] Figure 3 is a schematic structural diagram of a guiding device according to an embodiment of the present application;

[0022] Figure 4 is a schematic diagram of a magnified structure of a local area A according to an embodiment of the present application;

[0023] Figure 5 is a schematic structural diagram of a punching device according to an embodiment of the present application;

[0024] As shown in the figure:

[0025] 100, first unwinding device; 200, second unwinding device; 300, guiding device; 310, first guiding roller; 320, second guiding roller; 330, first gear; 340, driving motor; 400, ultrasonic welding device; 401, first transmission structure; 402, second gear; 410, mounting frame; 420, ultrasonic generator; 430, transducer; 440, welding wheel; 500, clamping wheel; 501, second transmission structure; 600, punching device; 610, fixing plate; 620, die table; 621, die hole; 630, driving cylinder; 640, die; 641, stamping column; 650, stabilizing rod; 700, substrate; 800, aluminum coil. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0027] The following describes the integrated processing equipment of the porous aluminum current collector composite material according to the embodiment of the present application in conjunction with the accompanying drawings.

[0028] like Figure 1 and Figure 2 As shown, the integrated processing equipment of the porous aluminum current collector composite material of the embodiment of the present application may include: a first unwinding device 100, a second unwinding device 200, a guiding device 300, an ultrasonic welding device 400, a pressure wheel 500 and a punching device 600 arranged in sequence along the discharge direction.

[0029] The two second unwinding devices 200 are respectively arranged on the upper and lower sides of the first unwinding device 100 , the substrate 700 is arranged on the first unwinding device 100 , and the two groups of aluminum coils 800 are respectively arranged on the two second unwinding devices 200 .

[0030] The substrate 700 and the two groups of aluminum coils 800 are unwound and passed through the guiding device 300 , respectively. When passing through the guiding device 300 , the substrate 700 is located between the two aluminum plates.

[0031] The rolling end of the ultrasonic welding device 400 is connected to the rotating end of the guide device 300 through the first transmission structure 401 to perform pressure welding on the substrate 700 and the aluminum coil 800, and the pressure wheel 500 is connected to the rolling end of the ultrasonic welding device 400 through the second transmission structure 501.

[0032] The punching device 600 is disposed on a side of the pressure wheel 500 away from the ultrasonic welding device 400 .

[0033] Specifically, when the relevant staff prepares the porous aluminum current collector composite material, first, the substrate 700 is installed on the first unwinding device 100, and two sets of aluminum coils 800 are installed on the second unwinding device 200 located on the upper and lower sides of the first unwinding device 100. Ensure that all materials are in the correct initial position and are ready for processing.

[0034] Then, after starting the equipment, the substrate 700 is unwound from the first unwinding device 100, and the two sets of aluminum coils 800 are unwound from their respective second unwinding devices 200. The three meet at the guide device 300, which is responsible for accurately aligning the substrate 700 and the two sets of aluminum coils 800 to ensure that they are in the correct position when entering the subsequent processing steps. The rotating end of the guide device 300 is connected to the rolling end of the ultrasonic welding device 400 through the first transmission structure 401 to ensure that the material will not deviate during the transmission process.

[0035] Next, the aligned substrate 700 and aluminum coil 800 are transported from the guide device 300 to the ultrasonic welding device 400. The rolling end of the ultrasonic welding device 400 is connected to the rotating end of the guide device 300 to ensure that the material remains stable during the welding process. The ultrasonic welding device 400 generates heat through high-frequency vibration, so that the substrate 700 and the aluminum coil 800 are melted and combined together at the contact surface to form a strong welding point.

[0036] The welded composite material is transported from the ultrasonic welding device 400 to the pressure wheel 500, which is connected to the rolling end of the ultrasonic welding device 400 through the second transmission structure 501 to further press the welded material to ensure that the welding part is more firm and flat.

[0037] The compacted composite material continues to be transmitted forward to reach the punching device 600, which is located on the side of the pressing wheel 500 away from the ultrasonic welding device 400. The punching device 600 punches the welded composite material to form the required porous structure. The punching process ensures that the shape and size of the holes meet the design requirements without affecting the overall strength and performance of the material. The punched composite material can be stored by cutting or rolling.

[0038] In one embodiment of the present application, Figure 3 As shown, the guide device 300 includes a first guide roller 310 , a second guide roller 320 , a first gear 330 and a driving motor 340 .

[0039] Among them, the first guide roller 310 and the second guide roller 320 are respectively arranged opposite to each other up and down, the two first gears 330 are coaxially connected to the first guide roller 310 and the second guide roller 320, and mesh with each other, and the output end of the drive motor 340 is connected to the first guide roller 310, wherein the aluminum coil 800 unwound on the upper and lower sides is guided by the first guide roller 310 and the second guide roller 320, respectively, and the substrate 700 passes between the two aluminum coils 800.

[0040] It should be noted that when the guiding device 300 guides the substrate 700 and the aluminum coil 800, the upper aluminum coil 800 is introduced into the first guide roller 310 from above, and the lower aluminum coil 800 is introduced into the second guide roller 320 from below, and the substrate 700 passes between the two aluminum coils 800 to ensure that the substrate 700 is located between the two aluminum coils 800 to form a sandwich structure.

[0041] Then, the driving motor 340 is started, and the output end of the driving motor 340 drives the first guide roller 310 to rotate. The rotation of the first guide roller 310 is transmitted to the other first gear 330 via the coaxial first gear 330, thereby driving the second guide roller 320 to rotate synchronously. The synchronous rotation of the first guide roller 310 and the second guide roller 320 enables the upper aluminum coil 800 and the lower aluminum coil 800 to move forward smoothly along a predetermined path. The substrate 700 is clamped by the two aluminum coils 800 and is also transmitted forward as the aluminum coil 800 moves, ensuring that the substrate 700 maintains the correct alignment position throughout the process.

[0042] Due to the precise matching of the first guide roller 310 and the second guide roller 320 and the synchronous transmission of the two first gears 330, the stability and alignment accuracy of the material during the transmission process are ensured.

[0043] In one embodiment of the present application, there are four ultrasonic welding devices 400 , which are arranged opposite to each other on both sides of the aluminum coil 800 , and the two ultrasonic welding devices 400 on each side are arranged opposite to each other up and down.

[0044] In addition, the first guide roller 310 and the second guide roller 320 on the side away from the driving motor 340 are respectively connected to the corresponding ultrasonic welding device 400 through the first transmission structure 401, and the second guide roller 320 on the side close to the driving motor 340 is also connected to the corresponding ultrasonic welding device 400 through the first transmission structure 401, and the rolling ends of the two ultrasonic welding devices 400 on this side are respectively meshed and connected through two second gears 402.

[0045] It should be noted that the four ultrasonic welding devices 400 act on both sides of the aluminum coil 800 at the same time, which can ensure that the welding points are evenly distributed and avoid stress concentration problems caused by single-point welding. The two ultrasonic welding devices 400 on each side are respectively arranged opposite to each other up and down, and welding can be performed simultaneously from the upper and lower directions, which improves the uniformity and stability of welding and reduces the possibility of welding defects. The design of the multi-point welding device allows the material to be welded uninterruptedly during the transmission process without pausing, thus realizing continuous processing.

[0046] To clearly illustrate the above embodiment, in one embodiment of the present application, Figure 4 As shown, the ultrasonic welding device 400 includes a mounting frame 410 , an ultrasonic generator 420 , a transducer 430 and a welding wheel 440 .

[0047] Among them, the mounting frame 410 is fixedly set on the outside of the aluminum coil 800, the transducer 430 is set on the mounting frame 410, the ultrasonic generator 420 is connected to one side of the transducer 430, and the welding wheel 440 is rotatably connected to the other side of the transducer 430, wherein the welding wheel 440 contacts the outer surface of the corresponding aluminum coil 800.

[0048] It should be noted that the mains power (50 / 60 Hz) is input to the ultrasonic generator 420 through the power cord, and the ultrasonic generator 420 converts the input mains power into a high-frequency electrical signal (for example, 20 kHz). The high-frequency electrical signal is transmitted to the transducer 430 through the cable. The piezoelectric ceramic sheet inside the transducer 430 generates high-frequency vibration under the action of the high-frequency electrical signal, and the transducer 430 transmits the high-frequency vibration to the welding wheel 440. The welding wheel 440 is connected to the transducer 430 through a connecting member (such as a rotating shaft, a bearing, etc.) to ensure that the vibration can be effectively transmitted to the welding wheel 440. The high-frequency vibration is transmitted to the contact surface of the aluminum coil 800 through the welding wheel 440, generating a local high temperature, so that the contact surface of the aluminum coil 800 melts to form a welding area. When the vibration stops, the molten aluminum cools and solidifies to form a firm welding point.

[0049] In one embodiment of the present application, the number of pressure wheels 500 corresponds one-to-one to the number of ultrasonic welding devices 400, and is connected to the rolling end of the corresponding ultrasonic welding device 400 through a second transmission structure 501 to ensure that after the ultrasonic welding device 400 welds the aluminum coil 800, the corresponding pressure wheel 500 can further press the weld point, maintain good contact, evenly distribute pressure, and improve the welding effect.

[0050] In one embodiment of the present application, Figure 5 As shown, the punching device 600 includes a fixing plate 610 , a die table 620 , a driving cylinder 630 , a pressing die 640 and a stabilizing rod 650 .

[0051] Among them, the fixed plate 610 and the die table 620 are respectively fixedly set on the outer sides of the two groups of aluminum coils 800, a plurality of die holes 621 are opened on the die table 620, the driving cylinder 630 is set on the fixed plate 610, and the telescopic end of the driving cylinder 630 extends vertically downward, the die 640 is set on the telescopic end of the driving cylinder 630, and a plurality of stamping columns 641 are arranged on the die 640, and the plurality of stamping columns 641 correspond one by one to the plurality of die holes 621, and stabilizing rods 650 are respectively arranged on both sides of the die 640, and the stabilizing rods 650 vertically penetrate the fixed plate 610 upward.

[0052] It should be noted that after the composite material is initially formed after welding and pressing, the relevant staff can control the driving cylinder 630 through the punching device 600, so that the driving cylinder 630 drives the pressing die 640 to descend, so that the punching column 641 punches holes into the corresponding die holes 621, thereby realizing the punching operation of the initially formed composite material.

[0053] To further ensure stability during the punching process, the feed end and the discharge end of the punching device 600 are provided with pressure rollers, which can not only further press the aluminum coil 800 and the substrate 700 that have just been welded, but also ensure that when the die 640 rises and resets, the aluminum coil 800 and the substrate 700 will not rise with it.

[0054] In one embodiment of the present application, the first transmission structure 401 and the second transmission structure 501 each include two tensioning wheels and a synchronous belt, wherein the synchronous belt is sleeved outside the two tensioning wheels, and when one of the tensioning wheels rotates, the other tensioning wheel is driven to rotate through the synchronous belt.

[0055] In one embodiment of the present application, the first unwinding device 100 and the second unwinding device 200 both include a roller body and a driver.

[0056] The roller body is rotatably arranged on a corresponding frame body, and a driver (such as a motor, etc.) is arranged on the frame body and connected to a rotating end of the roller body.

[0057] It should be noted that the stability and tension control of the substrate 700 and the aluminum coil 800 during unwinding are ensured through the control of the driver.

[0058] In summary, according to the integrated processing equipment of the porous aluminum current collector composite material according to the embodiment of the present application, by arranging the first unwinding device 100, the second unwinding device 200, the guiding device 300, the ultrasonic welding device 400, the pressure wheel 500 and the punching device 600 in sequence, efficient integration of multiple processes is achieved, and production efficiency is significantly improved; and the guiding device 300, the ultrasonic welding device 400 and the pressure wheel 500 are linked by the first transmission structure 401 and the second transmission structure 501, thereby improving the synergistic effect of the processing process, reducing processing deviations, and improving welding quality and production efficiency.

[0059] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0061] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An integrated processing device for porous aluminum current collector composite material, characterized in that: include: A first unwinding device (100), a second unwinding device (200), a guiding device (300), an ultrasonic welding device (400), a pressing wheel (500) and a punching device (600) are sequentially arranged along the discharging direction, wherein: The two second unwinding devices (200) are respectively arranged on the upper and lower sides of the first unwinding device (100); The substrate (700) is arranged on the first unwinding device (100), and the two groups of aluminum coils (800) are respectively arranged on the two second unwinding devices (200), and the substrate (700) and the two groups of aluminum coils (800) are respectively unwound and extended in a discharging direction through the guiding device (300); The rolling end of the ultrasonic welding device (400) is connected to the rotating end of the guiding device (300) via a first transmission structure (401) so as to perform pressure welding on the substrate (700) and the aluminum coil (800); The pressing wheel (500) is connected to the rolling end of the ultrasonic welding device (400) via a second transmission structure (501); The punching device (600) is disposed on a side of the pressing wheel (500) away from the ultrasonic welding device (400).

2. The integrated processing equipment for porous aluminum current collector composite material according to claim 1, characterized in that: The guiding device (300) comprises a first guiding roller (310), a second guiding roller (320), a first gear (330) and a driving motor (340), wherein: The first guide roller (310) and the second guide roller (320) are respectively arranged opposite to each other up and down; Two first gears (330) are coaxially connected to the first guide roller (310) and the second guide roller (320), respectively, and mesh with each other; The output end of the driving motor (340) is connected to the first guide roller (310); The aluminum coils (800) unwound on the upper and lower sides are guided by the first guide roller (310) and the second guide roller (320) respectively, and the substrate (700) passes between the two aluminum coils (800).

3. The integrated processing equipment for porous aluminum current collector composite material according to claim 2, characterized in that: There are four ultrasonic welding devices (400), which are arranged opposite to each other on both sides of the aluminum coil (800), and the two ultrasonic welding devices (400) on each side are arranged opposite to each other up and down.

4. The integrated processing equipment for porous aluminum current collector composite material according to claim 3, characterized in that: The first guide roller (310) and the second guide roller (320) on the side away from the driving motor (340) are respectively connected to the corresponding ultrasonic welding device (400) through a first transmission structure (401), and the second guide roller (320) on the side close to the driving motor (340) is also connected to the corresponding ultrasonic welding device (400) through the first transmission structure (401), and the rolling ends of the two ultrasonic welding devices (400) on this side are respectively meshed and connected through two second gears (402).

5. The integrated processing equipment for porous aluminum current collector composite material according to claim 1, characterized in that: The welding device (400) comprises a mounting frame (410), an ultrasonic generator (420), a transducer (430) and a welding wheel (440), wherein: The mounting frame (410) is fixedly arranged on the outer side of the aluminum coil (800); The transducer (430) is arranged on the mounting frame (410); The ultrasonic generator (420) is connected to one side of the transducer (430), and the welding wheel (440) is rotatably connected to the other side of the transducer (430); The welding wheel (440) contacts the outer surface of the corresponding aluminum coil (800).

6. The integrated processing equipment for porous aluminum current collector composite material according to claim 1, characterized in that: The number of the pressing wheels (500) corresponds one-to-one to the number of the ultrasonic welding devices (400), and are connected to the rolling ends of the corresponding ultrasonic welding devices (400) via a second transmission structure (501).

7. The integrated processing equipment for porous aluminum current collector composite material according to claim 1, characterized in that: The punching device (600) comprises a fixing plate (610), a die table (620), a driving cylinder (630), a pressing die (640) and a stabilizing rod (650), wherein: The fixed plate (610) and the die table (620) are respectively fixedly arranged on the outer sides of the two groups of aluminum coils (800), and the die table (620) is provided with a plurality of die holes (621); The driving cylinder (630) is arranged on the fixing plate (610), and the telescopic end of the driving cylinder (630) extends vertically downward; The pressing die (640) is arranged on the telescopic end of the driving cylinder (630), and a plurality of punching columns (641) are arranged on the pressing die (640), and the plurality of punching columns (641) correspond to the plurality of die holes (621) one by one; Stabilizing rods (650) are respectively disposed on both sides of the pressing mold (640), and the stabilizing rods (650) vertically penetrate the fixing plate (610) upwards.

8. The integrated processing equipment for porous aluminum current collector composite material according to claim 1, characterized in that: The first transmission structure (401) and the second transmission structure (501) both comprise two tensioning wheels and a synchronous belt, wherein the synchronous belt is sleeved outside the two tensioning wheels.

9. The integrated processing equipment for porous aluminum current collector composite material according to claim 1, characterized in that: The first unwinding device (100) and the second unwinding device (200) both comprise a roller body and a driver, wherein: The roller body can be rotatably arranged on the corresponding frame body; The driver is arranged on the frame body and connected with the rotating end of the roller body.

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