Looping device and strapping supply system

Abstract

This invention relates to a looper device, comprising a looper frame and at least two sets of looper rollers. Each looper roller is mounted on the looper frame and defines a conveyor belt channel within the frame. Each looper roller includes a looper roller shaft and multiple looper rollers adapted for conveyor belt movement, with each looper roller passing through a corresponding looper roller shaft. A strapping supply system employing this looper device is also provided. In this invention, by winding the strapping around each looper roller to form a conveyor belt channel within the frame, strapping storage can be achieved. This better coordinates the production pace between upstream strapping unwinding and downstream bundling operations, improving the continuity, reliability, and safety of robotic bundling operations. The invention uses multiple looper rollers to form a set of looper rollers, which significantly extends the length of the conveyor belt channel within the frame, increasing the looping capacity of the looper device.

Description

Technical Field

[0001] This invention belongs to the field of bundling equipment technology, specifically relating to a looper device and a strapping supply system using the looper device. Background Technology

[0002] With the development of science and technology, the heavy work of packaging and bundling will gradually be replaced by machines. In particular, with the mature development of robotics technology, fully automated packaging and bundling technology will gradually become widespread. Currently, there are already strapping uncoiling machines, but the uncoiled strapping is directly supplied to bundling robots. This can easily lead to a lack of coordination between the bundling operation and the strapping uncoiling operation, affecting production flow and efficiency. Summary of the Invention

[0003] The present invention relates to a looper device and a strapping supply system using the looper device, which can at least solve some of the defects of the prior art.

[0004] The present invention relates to a looper device, comprising a looper frame and at least two sets of looper rollers, each of the looper rollers being mounted on the looper frame and defining a belt-carrying channel within the frame, each of the looper rollers including a looper roller shaft and a plurality of looper roller wheels suitable for belt carrying, each of the looper roller wheels being mounted on a corresponding looper roller shaft.

[0005] As one embodiment, each of the looper rollers includes a fixed looper roller fixedly installed on the upper part of the looper frame and a tensioning looper roller installed on the guide rod of the looper frame, wherein the tensioning looper roller is equipped with a tensioning power source.

[0006] As one implementation method, the looper frame is a vertical looper frame, the tensioning looper roller is arranged below the fixed looper roller, the tensioning power source is a counterweight or an active power source, and the tension of the strapping is adjustable.

[0007] As one embodiment, the looper device further includes an inlet guide roller group and an outlet guide roller group arranged on both sides of the looper frame. The inlet guide roller group and the outlet guide roller group respectively define an external belt travel channel. The two external belt travel channels are respectively connected to the inlet and outlet of the internal belt travel channel.

[0008] As one embodiment, the inlet guide roller group and / or the outlet guide roller group includes a clamping mechanism for clamping the strapping, the clamping mechanism being arranged on an off-frame conveyor channel defined by the corresponding guide roller group.

[0009] As one embodiment, the clamping mechanism includes a clamping seat, a fixed clamping plate fixedly mounted on the clamping seat, and a movable clamping plate movably mounted on the clamping seat. The movable clamping plate is configured with a clamping drive structure for driving it to move closer to or away from the fixed clamping plate.

[0010] As one embodiment, the inlet guide roller group and / or the outlet guide roller group includes at least one set of limiting mechanisms; the limiting mechanism includes a first limiting roller group for constraining and guiding the strap surface and a second limiting roller group for constraining and guiding the strap edge, the axis of the first limiting roller is parallel to the axis of the guide roller, and the axis of the second limiting roller is perpendicular to the axis of the guide roller.

[0011] As one implementation, the outlet guide roller group includes multiple outlet turning rollers, which define an outlet side frame outer conveyor channel, and the outlet side frame outer conveyor channel is connected to the outlet of the inner conveyor channel.

[0012] As one implementation method, among the various outlet steering rollers, some are fixed steering rollers and some are oscillating steering rollers; the oscillating steering roller includes an oscillating roller body and an oscillating roller frame, the oscillating roller body is rotatably mounted on the oscillating roller frame, and the oscillating roller frame is rotatably mounted on a corresponding mounting base via an oscillating shaft, wherein the axis of the oscillating shaft is perpendicular to the axis of the oscillating roller body.

[0013] The present invention also relates to a strapping supply system, including a strapping uncoiler and a strapping conveyor unit adapted to be connected to a strapping head of a strapping robot, wherein the strapping uncoiler is connected to the strapping conveyor unit via a looper device as described above.

[0014] The present invention has at least the following beneficial effects:

[0015] In this invention, by winding the strapping around each looper roller to form a strapping channel within the frame, the strapping can be stored. This effectively coordinates the production pace between upstream strapping unwinding and downstream bundling operations, improving the continuity, reliability, and safety of the robotic bundling operation. Furthermore, this invention uses multiple looper rollers to form a set of looper rollers, which significantly extends the length of the strapping channel within the frame and increases the looping capacity of the looper device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 and Figure 2 This is a schematic diagram of the state of the strapping supply system provided in an embodiment of the present invention at a strapping position, wherein... Figure 1 and Figure 2 These are side views and top views, respectively.

[0018] Figure 3 and Figure 4 This is a schematic diagram of the state of the strapping supply system provided in an embodiment of the present invention at another strapping position, wherein... Figure 3 and Figure 4 These are side views and top views, respectively.

[0019] Figure 5 This is a schematic diagram of the structure of the looper device provided in an embodiment of the present invention;

[0020] Figure 6 This is a schematic diagram of the strapping conveyor unit provided in an embodiment of the present invention. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] like Figure 5 This embodiment provides a looper device 3, including a looper frame 31 and at least two sets of looper rollers, each of which is mounted on the looper frame 31 and defines a belt-carrying channel within the frame.

[0024] The axes of the looper rollers of each looper roller are parallel, ensuring that the strapping can pass through each looper roller to form the aforementioned strapping channel within the frame, thereby enabling the storage of the strapping.

[0025] In one embodiment, the aforementioned looper device 3 is a vertical looper, and the aforementioned looper frame 31 can be a vertical frame such as a vertical gantry frame. In this embodiment, two sets of looper rollers are used, and the two sets of looper rollers are preferably arranged vertically on the looper frame 31.

[0026] In one embodiment, such as Figure 5 Each of the aforementioned slip rollers includes a slip roller shaft and multiple slip rollers suitable for conveying the strapping tape. Each slip roller is mounted on its corresponding slip roller shaft. Adjacent slip rollers can be arranged at intervals or adjacent to each other. Preferably, the slip rollers are grooved rollers, which can limit and constrain the strapping tape, ensuring the reliability of the strapping tape. The shape of the conveying groove can be designed to match the width of the strapping tape, for example, using a V-groove roller or an H-groove roller.

[0027] In this embodiment, multiple looper rollers are used to form a set of looper rollers, which can significantly extend the length of the conveyor belt channel inside the frame and increase the looper capacity of the looper device 3.

[0028] Among them, for the aforementioned slip rollers, each slip roller is preferably rotatably mounted on the slip roller shaft, that is, in the form of an idler wheel, which can reduce the friction between the slip roller and the strapping, facilitate the conveying and operation of the strapping, and also extend the service life of the slip roller.

[0029] More preferably, the looper roller shaft is detachably mounted on the looper frame 31, and each looper roller is detachably mounted on the looper roller shaft, which facilitates the installation and maintenance of the looper roller. In particular, the number of looper rollers can be increased or decreased as needed to adjust the looper quantity, which can effectively improve the flexibility of the above-mentioned looper device 3.

[0030] In one embodiment, each of the looper rollers includes a fixed looper roller 32 fixedly installed on the upper part of the looper frame 31 and a tensioning looper roller 33 movably installed on the looper frame 31, wherein the tensioning looper roller 33 is provided with a tensioning power source 34.

[0031] Preferably, a guide rail is provided on the looper frame 31, and the tensioning looper roller 33 is slidably mounted on the guide rail, which can reliably constrain and guide the movement of the tensioning looper roller 33. In the case of a vertical looper, the tensioning looper roller 33 is preferably arranged directly below the fixed looper roller 32, and can move up and down on the looper frame 31 to move closer to or away from the fixed looper roller 32.

[0032] In this embodiment, by setting the fixed slip ring roller 32 and the tension slip ring roller 33 in cooperation, not only can tension force be provided to the strapping, so that the strapping can be supplied and transported while maintaining stable tension, ensuring the smoothness and stability of strapping supply; moreover, the distance between the tension slip ring roller 33 and the fixed slip ring roller 32 can be adaptively adjusted according to the working conditions such as the progress of the bundling operation, which can significantly improve the smoothness and reliability of production.

[0033] The strapping can be wound multiple times between the fixed slip ring roller 32 and the tension slip ring roller 33 to achieve a slip ring amount N (N≥2) times the moving distance of the tension slip ring roller 33. A limiting mechanism can be provided on the slip ring frame 31 to limit the moving stroke of the tension slip ring roller 33. This limiting mechanism can adopt conventional limiting methods such as limiting blocks, which will not be listed here.

[0034] For a vertical looper design, the tensioning looper roller 33 can be tensioned by a counterweight, meaning the tensioning power source 34 acts as a counterweight, and the tension of the strapping can be adjusted by increasing or decreasing the weight of the counterweight. The aforementioned tensioning power source 34 can also be an active power source, such as a cylinder, hydraulic cylinder, or a motor + reducer + transmission structure, which can be mounted on the looper frame 31.

[0035] The tension of the strapping belt can be adjusted by the tensioning power source 34, which can ensure that the strapping belt is kept taut and improve the smoothness and reliability of the strapping belt conveyor.

[0036] In the above-mentioned scheme of fixed slip roller 32 + tension slip roller 33, the entrance and exit of the belt conveyor channel inside the frame are both at the fixed slip roller 32. Specifically, the slip roller at one end of the fixed slip roller 32 forms the entrance of the belt conveyor channel inside the frame, and the slip roller at the other end of the fixed slip roller 32 forms the exit of the belt conveyor channel inside the frame.

[0037] Further optimize the above-mentioned looper device 3, such as Figure 5 The looper device 3 further includes an inlet guide roller group and an outlet guide roller group arranged on both sides of the looper frame 31. The inlet guide roller group and the outlet guide roller group respectively define an external belt travel channel. The two external belt travel channels are respectively connected to the inlet and outlet of the internal belt travel channel.

[0038] The strapping conveyed from upstream is guided into the looper 31 via the inlet guide roller group, and the strapping output from the looper 31 is guided to the downstream via the outlet guide roller group (such as the strapping conveyor unit 4 mentioned above).

[0039] In one embodiment, such as Figure 5 The aforementioned inlet guide roller assembly includes multiple inlet steering rollers 35, which define an outer conveyor channel on the inlet side frame. This outer conveyor channel connects to the inlet of the inner conveyor channel. For vertical loopers, the strapping conveyed upstream can be guided by the inlet steering rollers 35, causing the strapping to change from horizontal to vertical conveying, thus allowing it to reach the inlet of the inner conveyor channel on the upper part of the looper frame 31. The aforementioned inlet steering rollers 35 are preferably fixed steering rollers; some inlet steering rollers 35 can be mounted on the workshop foundation via roller frames, while others can be mounted on the looper frame 31.

[0040] In one embodiment, such as Figure 5The aforementioned outlet guide roller group includes multiple outlet steering rollers 36, which define an outlet side frame outer conveyor channel. This outlet side frame outer conveyor channel connects with the outlet of the inner conveyor channel. For the scheme where the outlet of the inner conveyor channel is located on the upper part of the looper frame 31, the strapping output from the looper frame 31 can be guided by each outlet steering roller 36 to cause the strapping to descend to near the workshop foundation, facilitating subsequent transportation.

[0041] In one embodiment, some of the aforementioned outlet guide rollers 36 are fixed guide rollers, and some are oscillating guide rollers 361. The oscillating guide rollers 361 are preferably located at the outlet of the conveyor belt channel outside the outlet side frame, that is, the oscillating guide rollers 361 are located downstream of each fixed guide roller. Since the strapping on the looper outlet side will twist slightly with the swing of the bundling head, and the strapping itself will also have slight deformation, this will generate torsional impact on the fixed guide rollers. By setting the oscillating guide rollers 361, while guiding the strapping, the strapping can oscillate adaptively during conveying. This adaptive function of the oscillating guide rollers 361 can reduce the impact force of the strapping on the guide rollers, avoid poor smoothness during strapping conveying, and prevent impact on the outlet guide rollers 36 or strapping breakage, thereby achieving smooth and safe conveying of the strapping.

[0042] In one embodiment, the aforementioned oscillating steering roller 361 includes an oscillating roller body and an oscillating roller frame. The oscillating roller body is rotatably mounted on the oscillating roller frame, and the oscillating roller frame is rotatably mounted on a corresponding mounting base via an oscillating shaft, wherein the axis of the oscillating shaft is perpendicular to the axis of the oscillating roller body. The aforementioned mounting base can be a workshop foundation or other mounting brackets.

[0043] The aforementioned steering rollers constitute the guide rollers of the inlet guide roller group and the outlet guide roller group. Preferably, each roller body of the aforementioned inlet guide roller group and the outlet guide roller group is preferably a grooved roller, which can limit and constrain the strapping tape it passes through, ensuring the reliability of the strapping tape. The shape of its tape-carrying groove can be designed to match the width specification of the strapping tape, for example, using a V-groove roller or an H-groove roller.

[0044] More preferably, the aforementioned guide roller is further equipped with a limiting structure to prevent the strapping from detaching from the roller body. This prevents the strapping from detaching from the roller body under conditions such as low strapping tension, ensuring the smoothness, reliability, and safety of strapping transport. In one embodiment, the limiting structure includes a pressure roller, the roller axis of which is parallel to the roller axis of the guide roller, and the roller surface of the pressure roller is close to the strapping wrapping area roller surface of the guide roller body. For a grooved roller type guide roller body, the pressure roller can be located at the groove opening of the grooved roller.

[0045] Further optimize the above-mentioned looper device 3, such as Figure 5The inlet guide roller group and / or the outlet guide roller group include a clamping mechanism 37 for clamping the strapping. The clamping mechanism 37 is arranged on the outer conveyor channel defined by the corresponding guide roller group. By setting the clamping mechanism 37, the strapping can be clamped on the inlet or outlet side of the looper 3, restricting the movement of the strapping and ensuring the reliability and safety of production. For example, when the looper 3 reaches full capacity, the strapping can be clamped on the inlet side of the looper 3, and the strapping uncoiler 11 stops conveying the strapping. When the strapping uncoiler 11 or the bundling device malfunctions, the strapping can be clamped on the outlet side of the looper 3, and the looper 3 stops conveying the strapping. When the strapping needs to be retrieved during the bundling process, the clamping mechanism 37 clamps the strapping on the inlet side of the looper, and the strapping will return to the looper under the action of the tensioning looper roller 33.

[0046] Preferably, both the inlet guide roller group and the outlet guide roller group include the clamping mechanism 37.

[0047] In one embodiment, the clamping mechanism 37 includes a clamping seat, a fixed clamping plate fixedly mounted on the clamping seat, and a movable clamping plate movably mounted on the clamping seat. The movable clamping plate is equipped with a clamping drive structure for driving it closer to or further away from the fixed clamping plate. This clamping drive structure can be a linear drive device such as a cylinder or hydraulic cylinder. Understandably, the movable clamping plate and the fixed clamping plate are arranged opposite to each other, and their surfaces are preferably parallel to the surface of the strapping.

[0048] Furthermore, the clamping mechanism 37 further includes at least one set of constraint rollers. The constraint roller set comprises two constraint rollers positioned opposite each other on either side of the outer conveyor belt path. The axial direction of the constraint rollers is parallel to the axial direction of the looper rollers. The distance between the two constraint rollers matches the thickness of the strapping. These two constraint rollers effectively constrain and limit the movement of the strapping, ensuring that the strapping is conveyed in the set direction and improving the stability of the strapping's movement. Preferably, constraint roller sets are positioned upstream and downstream of the fixed clamping plate.

[0049] Further optimize the above-mentioned looper device 3, such as Figure 5The inlet guide roller group and / or the outlet guide roller group include at least one set of limiting mechanisms 38. Each limiting mechanism 38 includes a first limiting roller group for constraining and guiding the strap surface and a second limiting roller group for constraining and guiding the strap edge. The axis of the first limiting roller is parallel to the axis of the guide roller, and the axis of the second limiting roller is perpendicular to the axis of the guide roller. The first limiting roller group includes two first limiting rollers positioned opposite each other on both sides of the strapping channel outside the frame. The distance between the two first limiting roller groups matches the thickness of the strap. These two first limiting roller groups effectively constrain and limit the movement of the strap, ensuring that the strap is conveyed in the set direction and improving the stability of the strapping operation. The second limiting roller group includes two second limiting rollers positioned opposite each other on both sides of the strapping channel outside the frame. The distance between the two second limiting roller groups matches the width of the strap. These two second limiting roller groups effectively constrain and limit the movement of the strap, preventing the strap from deviating from its intended path.

[0050] The above-mentioned looper 3 is used in the following manner:

[0051] 1) When the tensioning looper roller 33 is between the first stroke end (corresponding to the maximum loop amount) and the second stroke end (corresponding to the minimum loop amount), the strapping unwinder 11 starts to replenish the strapping device 3 with strapping.

[0052] 2) When the tensioning looper roller 33 approaches the first stroke end, the strapping uncoiler 11 decelerates and supplies strapping. When it reaches the first stroke end, the inlet clamping mechanism 37 clamps the strapping, and the strapping uncoiler 11 automatically stops working.

[0053] 3) When the tensioning slip roller 33 approaches the second stroke end, the strapping unwinder 11 accelerates the supply of strapping tape. Under normal circumstances, the slip device 3 has sufficient slip volume, and the tensioning slip roller 33 will float between the first stroke end and the second stroke end. However, in the event of a malfunction of the strapping unwinder 11, when the tensioning slip roller 33 reaches the second stroke end, the exit clamping mechanism 37 clamps the strapping tape, the slip device 3 stops supplying strapping tape, and a fault alarm is triggered.

[0054] Example 2

[0055] like Figures 1-4 This invention provides a strapping supply system, including a strapping uncoiler 1 and a strapping conveyor 4 adapted to be connected to a strapping head 5 of a strapping robot. The strapping uncoiler 1 is connected to the strapping conveyor 4 through the looper device 3 provided in the first embodiment above.

[0056] In one embodiment, such as Figures 1-4The strapping uncoiling unit 1 includes a strapping welder 2 and two strapping uncoiling machines 11. Both strapping uncoiling machines 11 are connected to the strapping welder 2, and the outlet of the strapping welder 2 is connected to the aforementioned looper device 3.

[0057] In one embodiment, the strapping unwinder 11 described above can be the strapping unwinding device disclosed in CN201721636632.2, the specific structure of which will not be described in detail here. Of course, other devices suitable for unwinding strapping rolls are also applicable to this embodiment.

[0058] Both strapping uncoils 11 can deliver the strapping head to the strapping welder 2. When the strapping roll on one strapping uncoil 11 is almost finished, the strapping roll on the other strapping uncoil 11 is uncoiled. The currently conveyed strapping tail and the strapping head of the newly uncoiled strapping roll are welded together at the strapping welder 2 to form a continuous strapping. This enables continuous supply of strapping, ensures smooth production, and improves bundling efficiency and production rhythm.

[0059] Preferably, the two strapping uncoiling machines 11 and the strapping welding machine 2 are arranged in a straight line.

[0060] The looper device 3 can store a certain length of strapping, which can better coordinate the production pace between the upstream strapping unwinding supply and the downstream bundling operation, and improve the smoothness, reliability and safety of system operation.

[0061] Example 3

[0062] This embodiment provides a strapping conveyor unit 4, which can be used in the above embodiment two.

[0063] like Figure 6 The strapping conveying unit 4 includes a conveying conduit 41 adapted to connect with the baling head 5 and a following mechanism for moving the conveying conduit 41 and the baling head 5 together. Through the following action of the following mechanism, the position of the conveying conduit 41 can be adjusted in a timely manner according to the baling operation and position of the baling head 5, so that the conveying conduit 41 can move with the baling head 5, effectively increasing the working range and quality of the baling robot.

[0064] The lumen of the aforementioned conveying conduit 41 is used for conveying the belt. Preferably, the conveying conduit 41 is detachably connected to the bundling head 5 and the following mechanism, which facilitates maintenance and allows for quick disassembly of the conveying conduit 41 for easy belt threading and belt breakage handling. The detachable connection method can be plug-in connection, snap-fit ​​connection, bolt fixing connection, etc.

[0065] As a preferred embodiment, the delivery conduit 41 is a flexible conduit. Based on the flexibility of the conduit, it can compensate for the positioning error of the following mechanism, improve the reliability of the strapping delivery, and prevent situations such as the delivery conduit 41 and the strapping being broken. For the flexible conduit, at least a portion of the delivery conduit 41 can be made of flexible metal tubing; of course, rubber tubing is also feasible.

[0066] In one embodiment, such as Figure 6 The following mechanism includes a base, a swing seat 421, and a lifting frame 422. The swing seat 421 is rotatably mounted on the base via a swing axis parallel to the vertical and has a swing drive structure 423 on the base. The swing seat 421 has a lifting drive structure 424, and the lifting frame 422 is connected to the lifting drive structure 424. The swing drive structure 423 can be a conventional swing drive device, such as a cylinder drive, where the cylinder body is hinged to the base and the cylinder output shaft is hinged to the swing seat 421. For the lifting of the lifting frame 422, preferably, as shown... Figure 6 The bottom end of the lifting frame 422 is hinged to the swing seat 421. The lifting drive structure 424 is used to drive the lifting frame 422 to swing up and down, thereby driving the conveying conduit 41 to rise and fall. In this way, the lifting drive structure 424 can adopt a conventional swing drive device, such as a cylinder drive. The cylinder body is hinged to the swing seat 421, and the output shaft of the cylinder is hinged to the lifting frame 422.

[0067] Furthermore, a locking structure can be provided, which can lock the lifting frame 422 after it has moved into position and release it when the lifting frame 422 needs to move. The locking structure can be achieved by driving the locking pin to be inserted into or pulled out of the pin hole on the lifting frame 422. The driving device can be a linear drive device such as a cylinder / hydraulic cylinder.

[0068] Furthermore, the lifting frame 422 is provided with a belt feeding channel communicating with the conveying conduit 41. The belt feeding channel can be a tubular channel or the like provided on the lifting frame 422. The two ends of the tubular channel are preferably arc-shaped tubes to facilitate belt threading and feeding.

[0069] As can be seen, the strapping conveyor unit 4 provided in this embodiment can not only reliably convey strapping, but also store a certain length of strapping, and can coordinate the production pace of upstream and downstream processes.

[0070] Example 4

[0071] This embodiment optimizes the strapping supply system provided in Embodiment 2 above. Preferably, the strapping unwinder 11 uses a drive motor capable of forward and reverse rotation as its power source. Based on this design, forward rotation of the drive motor enables strapping feeding, while reverse rotation enables strapping recovery. This design is convenient and reliable, avoiding strapping waste, interference with the work site, and safety hazards. In particular, based on the aforementioned looper device 3 and strapping conveyor unit 4, the recovered strapping does not need to be rewound; it can simply be stored through the strapping conveyor unit 4 and / or looper device 3, avoiding repeated strapping.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A looper device, characterized in that: It includes a looper frame and at least two sets of looper rollers. Each of the looper rollers is mounted on the looper frame and defines a belt-carrying channel within the frame. Each of the looper rollers includes a looper roller shaft and a plurality of looper roller wheels suitable for belt carrying. Each of the looper roller wheels passes through a corresponding looper roller shaft. Each of the aforementioned looper rollers includes a fixed looper roller fixedly installed on the upper part of the looper frame and a tensioning looper roller installed on the guide rod of the looper frame. The tensioning looper roller is equipped with a tensioning power source. The looper device also includes an inlet guide roller group and an outlet guide roller group arranged on both sides of the looper frame. The inlet guide roller group and the outlet guide roller group respectively define and form an external belt conveyor channel. The two external belt conveyor channels are respectively connected to the inlet and outlet of the internal belt conveyor channel. The outlet guide roller assembly includes multiple outlet steering rollers, which define an outlet side frame outer conveyor channel. The outlet side frame outer conveyor channel connects to the outlet of the inner conveyor channel. Among each outlet steering roller, some are fixed steering rollers and some are oscillating steering rollers. The oscillating steering roller includes an oscillating roller body and an oscillating roller frame. The oscillating roller body is rotatably mounted on the oscillating roller frame, and the oscillating roller frame is rotatably mounted on a corresponding mounting base via an oscillating shaft. The axis of the oscillating shaft is perpendicular to the axis of the oscillating roller body.

2. The looper device as described in claim 1, characterized in that: The looper frame is a vertical looper frame, the tensioning looper roller is arranged below the fixed looper roller, and the tensioning power source is a counterweight or an active power source, which makes the tension of the strap adjustable.

3. The looper device as described in claim 1, characterized in that: The inlet guide roller group and / or the outlet guide roller group include a clamping mechanism for clamping the strapping, the clamping mechanism being arranged on the off-frame strapping channel defined by the corresponding guide roller group.

4. The looper device as described in claim 3, characterized in that: The clamping mechanism includes a clamping seat, a fixed clamping plate fixedly mounted on the clamping seat, and a movable clamping plate movably mounted on the clamping seat. The movable clamping plate is configured with a clamping drive structure for driving it to move closer to or away from the fixed clamping plate.

5. The looper device as described in claim 1, characterized in that: The inlet guide roller group and / or the outlet guide roller group include at least one set of limiting mechanisms; the limiting mechanism includes a first limiting roller group for constraining and guiding the strap surface and a second limiting roller group for constraining and guiding the strap edge, the axis of the first limiting roller is parallel to the axis of the guide roller, and the axis of the second limiting roller is perpendicular to the axis of the guide roller.

6. A strapping supply system, comprising a strapping uncoiler and a strapping conveyor unit adapted to connect with a strapping head of a strapping robot, characterized in that: The strapping uncoiling unit is connected to the strapping conveying unit via a looper device as described in any one of claims 1 to 5.

Images