Belt storage device with quick return function

Abstract

The utility model discloses a kind of with quick return function's belt storage device, belong to packing belt conveying device field, and belt storage device is provided by setting return device, provides vertical tension traction under pulley set return when packing belt slack, make the packing belt that slack recovers tight, with can quickly and effectively absorb excess packing belt and make it recover tight state, ensure the stable, continuous conveying of packing belt, improve packing efficiency and stability, avoid the advantages of equipment failure.

Description

Technical Field

[0001] This utility model relates to the field of strapping conveyor devices, and in particular to a strapping storage device with a rapid return function. Background Technology

[0002] In baling operations, the strapping tape is typically output from an unwinding machine, passed through a tape storage device, and then transported to the baling machine for use. In actual operation, when the baling machine completes one baling action, there may be a mismatch between the unwinding speed of the unwinding machine and the lifting speed of the tape storage pulleys in the tape storage device.

[0003] This speed difference can cause the strapping to become loose between the unwinder and the storage device, between the storage device and the strapping machine, and even between the upper pulley group and the lower pulley group on the storage device. This is because the lower pulley group, relying on the lowering speed of the lifting mechanism, cannot maintain the strapping in a taut state, which in turn affects the stable subsequent conveying of the strapping and may even cause equipment failure.

[0004] Therefore, there is an urgent need for a solution that can quickly and effectively absorb excess strapping and restore it to a taut state to ensure stable and continuous conveying of the strapping. Utility Model Content

[0005] The purpose of this invention is to provide a strapping device with a rapid return function, which can effectively absorb excess strapping and quickly restore it to a taut state, ensuring stable transport of the strapping.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A strapping storage device with a rapid return function, which works in conjunction with an unwinding machine to input and output strapping used by a strapping machine, includes a fixed frame, a lifting mechanism mounted on the fixed frame, and a strapping pulley assembly. The lifting mechanism includes a lifting guide rail mounted on the fixed frame. The strapping pulley assembly includes an upper pulley assembly and a lower pulley assembly, which are configured to be slidably mounted on the lifting guide rail and used in combination to guide the strapping. The strapping storage device further includes:

[0008] The return device is installed at the bottom of the fixed frame and its upper end is connected to the lower pulley group. The return device is used to provide vertical tension to pull the lower pulley group back to its original position. The return device is also used to allow the upper pulley group and the lower pulley group to move closer to each other through the lifting guide rail when the strapping machine completes one strapping operation, so that the strapping tape between the unwinding machine, the tape storage device and the strapping machine is loosened. Then, the return device provides vertical tension to pull the lower pulley group back to its original position, so that the loose strapping tape is restored to tension.

[0009] Furthermore, the return device includes:

[0010] A first positioning element is installed at the bottom of the fixed frame and is located below the lower roller assembly;

[0011] A first tension spring, one end of which is connected to a first positioning member and the other end of which is connected to the lower pulley assembly, is used to provide vertical tension to pull the lower pulley assembly back to its original position.

[0012] Furthermore, at least one set of the return device is provided;

[0013] One end of the first tension spring is connected to the first positioning member, and the other end of the first tension spring is connected to the side of the lower roller assembly near the lifting mechanism.

[0014] Furthermore, at least one set of the return device is provided;

[0015] One end of the first tension spring is connected to the first positioning member, and the other end of the first tension spring is connected to the side of the lower roller assembly away from the lifting mechanism.

[0016] Furthermore, at least two sets of the return device are provided;

[0017] In at least one set of return devices, one end of the first tension spring is connected to the first positioning member and the other end of the first tension spring is connected to the side of the lower pulley group near the lifting mechanism.

[0018] And at least one end of the first tension spring in another set of return devices is connected to the first positioning member, and the other end of the first tension spring is connected to the side of the lower pulley set away from the lifting mechanism.

[0019] Furthermore, a first slide block is provided on the lifting guide rail, and the lower slide wheel assembly is installed on the first slide block;

[0020] The return device is used to provide vertical tension to pull the combination of the lower pulley assembly and the first slide back into position.

[0021] Furthermore, the tape storage device also includes:

[0022] A buffer device is mounted on top of a fixed frame and an upper pulley assembly is installed on the buffer device. The buffer device is used to provide vertical tension and buffer distance to prevent deformation of the upper pulley assembly shaft.

[0023] Furthermore, the buffer device includes:

[0024] A buffer guide rail is mounted on a fixed frame and located above the lifting guide rail. The buffer guide rail is arranged in the extending direction of the lifting guide rail and is used to provide a buffer distance to prevent deformation of the shaft of the upper pulley assembly.

[0025] The second positioning component is installed on the top of the fixed frame and is located above the upper pulley assembly;

[0026] A second tension spring, one end of which is connected to the second positioning member and the other end of which is connected to the upper pulley assembly, is used to provide vertical tension to prevent deformation of the shaft of the upper pulley assembly.

[0027] Furthermore, a second slide is provided on the lifting guide rail, and the upper pulley assembly is installed on the second slide. The second slide is used to reinforce the shaft of the upper pulley assembly.

[0028] The buffer device is used to provide vertical tension and buffer distance to prevent shaft deformation of the upper pulley assembly mounted on the second slide.

[0029] Furthermore, at least one set of the buffer device is provided;

[0030] One end of the second tension spring is connected to the second positioning member, and the other end of the second tension spring is connected to the upper pulley assembly.

[0031] This application provides a strapping device with a rapid return function. By setting a return device, it provides vertical tension to pull the lower pulley group back when the strapping is slack, so that the slack strapping is restored to tension. It has the advantages of being able to quickly and effectively absorb excess strapping and restore it to a taut state, ensuring stable and continuous conveying of the strapping, improving packaging efficiency and stability, and avoiding equipment failure.

[0032] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a tape storage device with a rapid return function in this embodiment;

[0034] Figure 2 This is a schematic diagram illustrating one of the structures of the return device in a tape storage device with a rapid return function in this embodiment;

[0035] Figure 3 This is a schematic diagram illustrating the second structure of the return device in a tape storage device with a rapid return function in this embodiment;

[0036] Figure 4 This is a schematic diagram illustrating the third structure of the return device in a tape storage device with a rapid return function in this embodiment.

[0037] Reference numerals: 1. Fixed frame; 2. Lifting mechanism; 3. Belt storage pulley group; 31. Upper pulley group; 32. Lower pulley group; 21. Lifting guide rail; 4. Return device; 41. First positioning component; 42. First tension spring; 211. First slide block; 5. Buffer device; 51. Buffer guide rail; 52. Second positioning component; 53. Second tension spring; 54. Second slide block. Detailed Implementation

[0038] To better illustrate the present invention, the invention will now be described in further detail with reference to the accompanying drawings.

[0039] It should be understood that, in order to make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely represents selected embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0040] The following is an illustration using a specific example.

[0041] In this embodiment, as Figure 1 As shown, a strapping device with a rapid return function is disclosed, which works in conjunction with an unwinding machine to input and output strapping used by a strapping machine. The strapping device includes a fixed frame 1, a lifting mechanism 2 mounted on the fixed frame 1, and a strapping wheel assembly 3. The lifting mechanism 2 includes a lifting guide rail 21 mounted on the fixed frame 1. The strapping wheel assembly 3 includes an upper pulley assembly 31 and a lower pulley assembly 32. The upper pulley assembly 31 and the lower pulley assembly 32 are slidably mounted on the lifting guide rail 21 and are used in combination to guide the strapping. The strapping device also includes:

[0042] The return device 4 is installed at the bottom of the fixed frame 1 and its upper end is connected to the lower pulley group 32. The return device 4 is used to provide vertical tension to pull the lower pulley group 32 back to its original position. The return device 4 is also used to make the upper pulley group 31 and the lower pulley group 32 move closer to each other through the lifting guide rail 21 when the strapping machine completes one strapping operation, so that the strapping tape between the unwinding machine, the tape storage device and the strapping machine is loosened. Then, the return device 4 provides vertical tension to pull the lower pulley group 32 back to its original position and restore the loose strapping tape to its original tension.

[0043] When the strapping machine completes a strapping operation, a speed mismatch between the unwinder and the strapping machine may cause the strapping to slack between the unwinder, the strapping storage device, and the strapping machine. In this case, the upper pulley group 31 and the lower pulley group 32 will move away from each other via the lifting guide rail 21 to accommodate the slack in the strapping. To solve this problem, this device introduces a return device 4, which is installed at the bottom of the fixed frame 1 and its upper end is connected to the lower pulley group 32. When the strapping slacks, the return device 4 constantly provides vertical tension, actively pulling the lower pulley group 32 downwards. Through this traction, the slack strapping is quickly tightened and restored to a taut state, thus ensuring the stability and continuity of the strapping throughout the entire conveying process and avoiding conveying interruptions or efficiency reductions caused by slack.

[0044] Through the above, this application effectively solves the problem of slack strapping caused by the mismatch between the unwinding speed of the unwinding machine and the lifting speed of the lower storage pulley of the strapping device when the strapping machine completes one strapping cycle. The return device 4 provides vertical tension, which quickly pulls the lower pulley group 32 back to its original position, allowing the slack strapping to rapidly return to a taut state. This ensures stable strapping delivery and avoids problems such as strap jamming, strap breakage, or reduced strapping efficiency that may result from slack strapping, thus improving the reliability and efficiency of the entire strapping system.

[0045] Based on the above, for the example structure of the return device 4, in this embodiment, as follows: Figure 1 As shown, the return device 4 includes:

[0046] The first positioning element 41 is installed at the bottom of the fixed frame 1 and is located below the lower roller assembly 32;

[0047] A first tension spring 42, one end of which is connected to the first positioning member 41 and the other end of which is connected to the lower roller assembly 32, is used to provide vertical tension to pull the lower roller assembly 32 back to its original position.

[0048] The first positioning element 41 provides a stable fixing point for the first tension spring 42. The first tension spring 42 is an elastic element capable of providing restoring force through its own deformation, which is used to provide continuous and stable vertical tension.

[0049] The return device 4 is explicitly defined as including the first positioning element 41 and the first tension spring 42. This shifts from a functional description to a specific structural implementation, providing a foundation for the stable operation of the return device 4.

[0050] The first positioning element 41 is installed at the bottom of the fixed frame 1 and below the lower roller assembly 32. This provides a stable and appropriately positioned fixing point for the first tension spring 42. By setting the first positioning element 41 at the bottom of the fixed frame 1 and below the lower roller assembly 32, it is ensured that the first tension spring 42 can apply an effective vertical tension to the lower roller assembly 32 from below, providing a stable support point for the return of the lower roller assembly 32.

[0051] One end of the first tension spring 42 is connected to the first positioning member 41, and the other end is connected to the lower pulley assembly 32. It provides vertical tension to pull the lower pulley assembly 32 back to its original position. When the strapping machine finishes strapping or the strapping tape is consumed, the first tension spring 42 is stretched, generating a vertical tension on the lower pulley assembly 32, thereby pulling the lower pulley assembly 32 back to its original position. This tension spring-based structure is simple and reliable, providing continuous and stable tension, effectively solving the problem of unstable tension during the return of the lower pulley assembly 32 and the tightening of the strapping tape. Due to this specific structure, the return device 4 can stably and reliably provide the required vertical tension, ensuring the stable return of the lower pulley assembly 32 and the effective tightening of the strapping tape, thus guaranteeing stable strapping tape transport. It effectively absorbs excess tape between the unwinder and the tape storage device, as well as between the tape storage device and the strapping machine, avoiding the impact of the strapping tape being in a slack state on stable transport.

[0052] In this embodiment, as one of the preferred solutions, such as Figure 2 As shown, at least one set of the return device 4 is provided; wherein, one end of the first tension spring 42 is connected to the first positioning member 41 and the other end of the first tension spring 42 is connected to the side of the sliding wheel assembly 32 near the lifting mechanism 2.

[0053] Specifically, the strapping device can be equipped with a return device 4. This return device 4 includes a first positioning element 41 and a first tension spring 42. The first positioning element 41 can be a bracket or connecting plate fixed to the bottom of the strapping device mounting frame 1. One end of the first tension spring 42 is connected to the first positioning element 41 via a hook or bolt. The other end of the first tension spring 42 is connected to the sliding pulley assembly 32. Specifically, the sliding pulley assembly 32 is typically mounted on the lifting mechanism 2. The other end of the first tension spring 42 can be connected to the side of the sliding pulley assembly 32 near the lifting guide rail 21, for example, by providing a connecting hole or lug on the side of the sliding pulley assembly 32. When the strapping slacks, the sliding pulley assembly 32 descends under gravity, stretching the first tension spring 42. When the strapping needs to regain tension, the contraction force of the first tension spring 42 pulls the sliding pulley assembly 32 downwards. Since the connection point of the first tension spring 42 is precisely set on the side of the lower pulley assembly 32 close to the lifting guide rail 21, the direction of the tension is highly consistent with the direction of movement of the lower pulley assembly 32 on the guide rail, thereby ensuring that the lower pulley assembly 32 is subjected to uniform force during the return process, avoiding tilting or jamming on the guide rail, and ensuring the stability and smoothness of the return.

[0054] In this embodiment, as a second preferred option, such as Figure 3 As shown, at least one set of the return device 4 is provided; wherein, one end of the first tension spring 42 is connected to the first positioning member 41 and the other end of the first tension spring 42 is connected to the side of the lower roller group 32 away from the lifting mechanism 2.

[0055] Specifically, the strapping device can be equipped with a return device 4. This return device 4 includes a first positioning element 41 and a first tension spring 42. The first positioning element 41 can be a bracket or connecting plate fixed to the bottom of the strapping device mounting frame 1. One end of the first tension spring 42 is connected to the first positioning element 41 via a hook or bolt. The other end of the first tension spring 42 is connected to the sliding pulley assembly 32. Specifically, the sliding pulley assembly 32 is typically mounted on the lifting mechanism 2. The other end of the first tension spring 42 is connected to the side of the sliding pulley assembly 32 away from the lifting guide rail 21. When the strapping slacks, the sliding pulley assembly 32 descends under gravity, stretching the first tension spring 42. When the strapping needs to regain tension, the contraction force of the first tension spring 42 pulls the sliding pulley assembly 32 downwards. Since the connection point of the first tension spring 42 is precisely set on the side of the lower pulley assembly 32 away from the lifting guide rail 21, the direction of the tension is consistent with the direction of movement of the lower pulley assembly 32 on the guide rail. Since the lower pulley assembly 32 has a lever effect in the process of the first tension spring 42 providing tension, it is ensured that the lower pulley assembly 32 is significantly affected by the first tension spring 42 during the return process, so that the lower pulley assembly 32 can achieve rapid return.

[0056] In this embodiment, as a third preferred option, such as Figure 4 As shown, at least two sets of the return device 4 are provided;

[0057] In at least one set of return devices 4, one end of the first tension spring 42 is connected to the first positioning member 41 and the other end of the first tension spring 42 is connected to the side of the lower pulley group 32 near the lifting mechanism 2.

[0058] And at least one end of the first tension spring 42 in another set of return devices 4 is connected to the first positioning member 41 and the other end of the first tension spring 42 is connected to the side of the lower pulley group 32 away from the lifting mechanism 2.

[0059] Based on the above structure, the strapping device can be configured with two sets of return devices 4, and the first tension springs 42 in these two sets of return devices 4 are respectively connected to the side of the lower pulley assembly 32 closest to the lifting mechanism 2 and the side furthest from the lifting mechanism 2. This solves the problem of unstable return and skewness of the lower pulley assembly 32 that may be caused by a single set of return devices 4 or a single-sided connection. Specifically, when the strapping is slack, the lower pulley assembly 32 descends under the action of gravity, causing the first tension springs 42 in the return devices 4 connected to both sides of the lower pulley assembly 32 to contract, thus restoring the strapping to tension. This dual-sided, multi-point tension application method increases the points at which tension is applied to the lower pulley assembly 32, providing more comprehensive and balanced tension support for the lower pulley assembly 32, and effectively avoiding the problem of uneven load caused by uneven force on one side.

[0060] In this embodiment, as Figure 1 As shown, a first slide block 211 is provided on the lifting guide rail 21, and the lower slide wheel assembly 32 is installed on the first slide block 211;

[0061] The return device 4 is used to provide vertical pulling force to pull the combination of the lower pulley assembly 32 and the first slide block 211 back to its original position.

[0062] Specifically, a first slide block 211 is provided on the lifting guide rail 21. This first slide block 211 provides a dedicated and stable fixed interface for the movement of the lower sliding wheel assembly 32 on the lifting guide rail 21. After the lower sliding wheel assembly 32 is installed on the first slide block 211, the movement trajectory of the lower sliding wheel assembly 32 is more precise and smooth, reducing the instability of up and down sliding caused by the lower sliding wheel block being directly installed on the lifting guide rail 21.

[0063] Based on this, the lower sliding wheel assembly 32 is mounted on the first slide block 211, so that the lower sliding wheel assembly 32 no longer directly contacts the lifting guide rail 21 and bears sliding friction. Through the bearing and guidance of the first slide block 211, the shaft and connecting parts of the lower sliding wheel assembly 32 are better protected, avoiding wear or deformation caused by direct force or friction, thereby extending the service life of the lower sliding wheel assembly 32. The return device 4 is used to provide vertical pulling force to pull the combination of the lower sliding wheel assembly 32 and the first slide block 211 back to its original position. This means that the pulling force of the return device 4 acts on a more stable and integrated component. As the support and guide structure of the lower sliding wheel assembly 32, the first slide block 211 can transmit the pulling force of the return device 4 to the lifting guide rail 21 more evenly and effectively, ensuring that the lower sliding wheel assembly 32 moves smoothly and quickly along the preset path during the return process.

[0064] In this embodiment, as Figure 1 As shown, the tape storage device further includes:

[0065] A buffer device 5 is installed on the top of the fixed frame 1 and an upper pulley group 31 is mounted on the buffer device 5. The buffer device 5 is used to provide vertical tension and buffer distance to prevent the shaft deformation of the upper pulley group 31.

[0066] To address the issue of deformation of the upper pulley assembly 31 shaft, a buffer device 5 was added to the belt storage device. This buffer device 5 is installed on top of the fixed frame 1, and the upper pulley assembly 31 is mounted on it. When the strapping strap exerts impact or continuous tension on the upper pulley assembly 31 during transport, or when the upper pulley assembly 31 and the lower pulley assembly 32 are pulled against each other, the buffer device 5 provides a vertical tensile force, which acts as an upward supporting force. This effectively counteracts or reduces the downward pressure on the shaft of the upper pulley assembly 31, thereby preventing the shaft of the upper pulley assembly 31 from bending under stress.

[0067] In this embodiment, specifically, such as Figure 1 As shown, the buffer device 5 includes:

[0068] A buffer guide rail 51 is mounted on the fixed frame 1 and located above the lifting guide rail 21. The buffer guide rail 51 is arranged in the extending direction of the lifting guide rail 21 and is used to provide a buffer distance to prevent the shaft deformation of the upper pulley assembly 31.

[0069] The second positioning element 52 is installed on the top of the fixed frame 1 and is located above the upper pulley assembly 31;

[0070] A second tension spring 53 is connected at one end to the second positioning member 52 and at the other end to the upper pulley assembly 31. The second tension spring 53 is used to provide vertical tension to prevent the shaft of the upper pulley assembly 31 from deforming.

[0071] First, the buffer guide rail 51 is mounted on the fixed frame 1, located above the lifting guide rail 21, and arranged along the extending direction of the lifting guide rail 21. This arrangement allows the buffer guide rail 51 to provide a movable buffer space for the upper pulley assembly 31. When the upper pulley assembly 31 is raised or lowered or subjected to external impact, the buffer guide rail 51 can guide its movement and provide the required buffer distance, absorbing the impact force and preventing the shaft of the upper pulley assembly 31 from deforming due to excessive instantaneous force. By aligning with the direction of the lifting guide rail 21, the buffering function is ensured to match the lifting direction of the upper pulley assembly 31, improving the buffering effect.

[0072] The second positioning element 52 is mounted on top of the fixed frame 1 and located above the upper pulley assembly 31. This positioning element serves as the fixed end of the second tension spring 53, providing it with a stable anchor point. One end of the second tension spring 53 is connected to the second positioning element 52, and the other end is connected to the upper pulley assembly 31. This connection allows the second tension spring 53 to continuously apply an upward vertical force to the upper pulley assembly 31. This force can counteract the downward impact or gravity that the upper pulley assembly 31 may experience during operation, thereby maintaining the stability of the upper pulley assembly 31's position and preventing its shaft from deforming downwards due to uneven force or impact.

[0073] In this embodiment, as Figure 1 As shown, a second slide block 54 is provided on the lifting guide rail 21, and the upper pulley assembly 31 is installed on the second slide block 54. The second slide block 54 is used to reinforce the shaft of the upper pulley assembly 31.

[0074] The buffer device 5 is used to provide vertical tension and buffer distance to prevent shaft deformation of the upper pulley group 31 mounted on the second slide block 54.

[0075] The second slide 54 serves as a dedicated mounting base for the upper pulley assembly 31, allowing the upper pulley assembly 31 to be securely mounted on it. In this way, the second slide 54 provides mounting reinforcement for the shaft of the upper pulley assembly 31. This means that the structure of the slide can distribute the stress acting on the shaft, thereby significantly improving the shaft's resistance to deformation. Even when the strapping moves rapidly or is subjected to uneven force, the shaft can remain straight and stable, avoiding strapping jamming or poor conveying caused by shaft deformation. On this basis, the buffer device 5 plays its role, providing vertical tension and buffer distance to prevent deformation of the shaft of the upper pulley assembly 31 mounted on the second slide 54.

[0076] In this embodiment, preferably, at least one set of buffer devices 5 is provided;

[0077] One end of the second tension spring 53 is connected to the second positioning member 52, and the other end of the second tension spring 53 is connected to the upper pulley group 31.

[0078] Specifically, in this embodiment, for example, a set of buffer devices 5 is provided. The buffer devices 5 are installed on the top of the fixed frame 1, and an upper pulley assembly 31 is mounted on it. Its main function is to provide vertical tension and buffer distance to effectively prevent shaft deformation of the upper pulley assembly 31. The buffer device 5 includes a second positioning member 52 and a second tension spring 53. The second positioning member 52 is installed on the top of the fixed frame 1 and above the upper pulley assembly 31, providing a stable fixing point for the second tension spring 53. The key is that one end of the second tension spring 53 is directly connected to the second positioning member 52, while its other end is directly and firmly connected to the upper pulley assembly 31. This direct connection ensures that the vertical tension generated by the second tension spring 53 can act stably and efficiently on the upper pulley assembly 31, directly resisting external stresses that may cause shaft deformation of the upper pulley assembly 31.

[0079] Finally, it should be noted that the above-described embodiments are merely specific implementations of this disclosure, used to illustrate the technical solutions of this disclosure, and not to limit them. The protection scope of this disclosure is not limited thereto. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the scope of the technology disclosed in this disclosure. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure, and should all be covered within the protection scope of this disclosure.

Claims

1. A strapping device with a rapid return function, which cooperates with an unwinding machine to input and output strapping used by a strapping machine, the strapping device comprising a fixed frame, a lifting mechanism mounted on the fixed frame, and a strapping wheel assembly, the lifting mechanism comprising a lifting guide rail mounted on the fixed frame, the strapping wheel assembly comprising an upper pulley assembly and a lower pulley assembly, the upper pulley assembly and the lower pulley assembly being configured to be slidably mounted on the lifting guide rail and used in combination to guide the strapping, characterized in that, The tape storage device also includes: The return device is installed at the bottom of the fixed frame and its upper end is connected to the lower pulley group. The return device is used to provide vertical tension to pull the lower pulley group back to its original position. The return device is also used to allow the upper pulley group and the lower pulley group to move closer to each other through the lifting guide rail when the strapping machine completes one strapping operation, so that the strapping tape between the unwinding machine, the tape storage device and the strapping machine is loosened. Then, the return device provides vertical tension to pull the lower pulley group back to its original position, so that the loose strapping tape is restored to tension.

2. The tape storage device according to claim 1, characterized in that, The return device includes: A first positioning element is installed at the bottom of the fixed frame and is located below the lower roller assembly; A first tension spring, one end of which is connected to a first positioning member and the other end of which is connected to the lower pulley assembly, is used to provide vertical tension to pull the lower pulley assembly back to its original position.

3. The tape storage device according to claim 2, characterized in that: At least one set of the return device shall be provided; One end of the first tension spring is connected to the first positioning member, and the other end of the first tension spring is connected to the side of the lower roller assembly near the lifting mechanism.

4. The tape storage device according to claim 2, characterized in that: At least one set of the return device shall be provided; One end of the first tension spring is connected to the first positioning member, and the other end of the first tension spring is connected to the side of the lower roller assembly away from the lifting mechanism.

5. The tape storage device according to claim 2, characterized in that: At least two sets of the return device are provided; In at least one set of return devices, one end of the first tension spring is connected to the first positioning member and the other end of the first tension spring is connected to the side of the lower pulley group near the lifting mechanism. And at least one end of the first tension spring in another set of return devices is connected to the first positioning member, and the other end of the first tension spring is connected to the side of the lower pulley set away from the lifting mechanism.

6. The tape storage device according to claim 1, characterized in that: A first slide block is provided on the lifting guide rail, and the lower slide wheel assembly is installed on the first slide block; the return device is used to provide vertical pulling force to pull the combination of the lower slide wheel assembly and the first slide block back to its original position.

7. The tape storage device according to claim 1, characterized in that, The tape storage device further includes: A buffer device is mounted on top of a fixed frame and an upper pulley assembly is installed on the buffer device. The buffer device is used to provide vertical tension and buffer distance to prevent deformation of the upper pulley assembly shaft.

8. The tape storage device according to claim 7, characterized in that, The buffer device includes: A buffer guide rail is mounted on a fixed frame and located above the lifting guide rail. The buffer guide rail is arranged in the extending direction of the lifting guide rail and is used to provide a buffer distance to prevent deformation of the shaft of the upper pulley assembly. The second positioning component is installed on the top of the fixed frame and is located above the upper pulley assembly; A second tension spring, one end of which is connected to the second positioning member and the other end of which is connected to the upper pulley assembly, is used to provide vertical tension to prevent deformation of the shaft of the upper pulley assembly.

9. The tape storage device according to claim 8, characterized in that: A second slide is provided on the lifting guide rail, and the upper pulley assembly is installed on the second slide. The second slide is used to reinforce the shaft of the upper pulley assembly. The buffer device is used to provide vertical tension and buffer distance to prevent shaft deformation of the upper pulley assembly mounted on the second slide.

10. The tape storage device according to claim 8, characterized in that: At least one set of the buffer device shall be provided; One end of the second tension spring is connected to the second positioning member, and the other end of the second tension spring is connected to the upper pulley assembly.

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