A strap tensioning device and strap tensioning method thereof

Abstract

The present invention discloses a strapping belt tensioning device and a strapping belt tensioning method thereof, comprising a support, a low-tension shaft and a high-tension shaft rotatably mounted on the support, a force-increasing gear set for increasing torque from the high-tension shaft to the low-tension shaft is connected between the low-tension shaft and the high-tension shaft, the low-tension shaft is connected to a driving pulley for conveying the strapping belt; the ends of the low-tension shaft and the high-tension shaft are respectively connected to a low-tension wheel and a high-tension wheel through a first clutch and a second clutch, and the low-tension wheel and the high-tension wheel are both dynamically connected to the same driving wheel; the present invention arranges a low-tension wheel and a high-tension wheel, and relies on the engaged state of the first clutch and the second clutch to achieve the output of low-tension or high-tension, and can use different tension sizes at different stages of belt winding, thereby being able to meet the high requirements for tension in the process of tightening the strapping belt and achieve a packaging effect with higher compactness.

Description

Technical Field

[0001] The present invention relates to the technical field of baling machines, and in particular to a baling belt tensioning device and a baling belt tensioning method thereof. Background Art

[0002] A baler is a device that uses strapping tape to bundle items. The entire packaging process of an automated baler involves several steps, including feeding the tape, feeding the tape into place, pressing the tape head end (free end), collecting the tape, pressing the tape tail end (wireless long end), welding and cutting the tape, spitting the tape, and resetting the machine head. In the collecting tape step, the strapping tape needs to be tightened to ensure that the goods are tight and not loose after being bundled. Therefore, the tightening process in the collecting tape step is often a key factor in whether the baler can meet the tightness requirements after bundling the goods. If the strapping tape is not tightened in place, the strapping tape will be loose after packaging and will not achieve the bundling effect. With the development of the packaging industry, the demand for the tightness of strapping tape is getting higher and higher, but the existing strapping tape tightening method cannot meet the actual demand.

[0003] For example, a Chinese patent application with application publication number CN 105253349 A discloses a baling machine, which includes a belt-returning mechanism. When the motor rotates left, the strapping belt of the belt-returning mechanism is retracted, and the belt-returning cam pushes the swing rod to tighten the first tension spring, so that the belt-pressing rod is in a tensioned state, the pressure of the pressure wheel on the strapping belt is increased to increase the friction force, and the second bevel gear also reverses and drives the flat surface of the short shaft to rotate, so that the torsion spring does not rotate with the second bevel gear, so that the strapping belt is retracted onto the bundled object, completing the effect of winding and tightening the strapping belt; however, in this scheme, when tightening the strapping belt, although a belt-returning cam is provided to increase the pressure of the pressure wheel on the strapping belt to increase the friction force to prevent the strapping belt from slipping during the tightening process, the same power device as the belt-feeding mechanism is still used, and no measures are taken to increase the tension of the tightened strapping belt. Therefore, the tightening effect is not ideal.

[0004] For another example, a Chinese patent application with application publication number CN 111392093 A discloses a head for a baling machine and a baling machine, wherein a driving wheel is rotatably arranged on a mounting base and forms an arc-shaped belt feeding channel with a guide block, a first motor is used to drive the driving wheel to rotate, and the driving wheel is used to drive the baling belt to perform belt feeding and belt taking-up operations. In order to allow the baling belt to be transported closely on the driving wheel, the baling belt is pressed against the driving wheel by a clamping wheel in a clamping assembly. In this way, although the friction force on the baling belt during the belt taking-up process can be increased, so as to improve the tensioning effect to a certain extent, the structure of the belt feeding and belt taking-up is not changed in this solution, and a better tensioning effect is not formed. It can be seen that this solution cannot actually meet the demand for a higher tensioning effect. Summary of the invention

[0005] The object of the present invention is to provide a strapping tensioning device and a strapping tensioning method thereof, so as to solve the problems existing in the above-mentioned prior art. By setting a low-tension wheel and a high-tension wheel, and relying on the engaged state of a first clutch and a second clutch to achieve low-tension or high-tension output, different tension sizes can be used in different stages of strapping, thereby being able to meet the high requirements for tension in the process of tightening the strapping, and achieving a more compact packaging effect.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a strapping tensioning device, comprising a support, and a low-tension shaft and a high-tension shaft rotatably mounted on the support, a force-increasing gear set for increasing the torque of the low-tension shaft from the high-tension shaft to the low-tension shaft is connected between the low-tension shaft and the high-tension shaft, the low-tension shaft is connected to a driving pulley for conveying the strapping belt; the ends of the low-tension shaft and the high-tension shaft are respectively connected to a low-tension wheel and a high-tension wheel through a first clutch and a second clutch, and the low-tension wheel and the high-tension wheel are both dynamically connected to the same driving wheel.

[0008] Preferably, the driving wheel, the low-tension wheel and the high-tension wheel are sleeved in the same belt to achieve drive connection.

[0009] Preferably, the end of the high-tension shaft away from the second clutch is connected to a third clutch, and when the third clutch is engaged, the high-tension shaft stops rotating.

[0010] Preferably, the high-tension shaft includes a first high-tension shaft and a second high-tension shaft, the two ends of the first high-tension shaft are respectively connected to the second clutch and the third clutch, the second high-tension shaft and the first high-tension shaft and the second high-tension shaft and the low-tension shaft are respectively connected through different force-increasing gear sets.

[0011] Preferably, the first high-tensile axis, the second high-tensile axis and the low-tensile axis are arranged in a triangle.

[0012] Preferably, the power booster gear group includes a first power booster gear group, a second power booster gear group, a third power booster gear group and a fourth power booster gear group, the first power booster gear group includes a first pinion and a first large gear meshingly connected, the second power booster gear group includes a second pinion and a second large gear meshingly connected, the third power booster gear group includes a third pinion and a third large gear meshingly connected, and the fourth power booster gear group includes a fourth pinion and a fourth large gear meshingly connected; the first high-tension shaft is fixedly connected to the first pinion, and is rotationally connected to the second large gear and the third pinion, and the second large gear and the third pinion are fixedly connected; the second high-tension shaft is fixedly connected to the first large gear and the second pinion, and is rotationally connected to the third large gear and the fourth pinion, and the third large gear and the fourth pinion are fixedly connected; the low-tension shaft is connected to the fourth large gear via a fourth clutch.

[0013] Preferably, the first force-boosting gear set, the third force-boosting gear set, the fourth force-boosting gear set and the second force-boosting gear set are axially arranged in sequence.

[0014] The present invention also provides a strapping belt tightening method, which uses the strapping belt tightening device described above, and comprises the following steps:

[0015] After the strapping tape is delivered to the destination, the head end of the strapping tape is pressed and the tape is reeled in, and the tightening operation is performed at the same time during the reeling process;

[0016] The first clutch is engaged, and the second clutch is released, so that the driving wheel drives the low-tension shaft to rotate through the low-tension wheel, and the low-tension shaft drives the driving pulley to rotate, thereby performing low-tension tensioning;

[0017] Keep the first clutch engaged, and engage the second clutch at the same time, the driving wheel drives the high-tension shaft to rotate through the high-tension wheel, the high-tension shaft drives the low-tension shaft to rotate through the force-increasing gear set, and the low-tension shaft drives the driving pulley to rotate, so as to perform high-tension tensioning;

[0018] After one or more high-tension tightening operations, the strapping belt tightening operation is completed.

[0019] Preferably, the end of the high-tension shaft away from the second clutch is connected to a third clutch, and the third clutch is released both when low-tension tensioning and high-tension tensioning are performed.

[0020] Preferably, after completing a high-tension tensioning, the first clutch is kept engaged, the second clutch is released, the third clutch is engaged, and the high-tension shaft is in a braking state; after the braking state ends, the first clutch is kept released, the second clutch is engaged, the third clutch is released, and high-tension tensioning continues; the braking state and high-tension tensioning steps are repeated, and tensioning is performed several times.

[0021] Compared with the prior art, the present invention has achieved the following technical effects:

[0022] (1) The present invention provides a low-tension wheel and a high-tension wheel, and relies on the engaged state of the first clutch and the second clutch to achieve low-tension or high-tension output, and can use different tensions at different stages of belt winding, thereby meeting the high requirements for tension in the process of tightening the strapping belt and achieving a more compact packaging effect;

[0023] (2) The driving wheel, the low-tension wheel and the high-tension wheel of the present invention are sleeved in the same belt to realize drive connection. With the participation of the first clutch and the second clutch, it is possible to use one belt to transmit power to the low-tension wheel or the high-tension wheel, and the working states of the two do not affect each other;

[0024] (3) The high-tension shaft of the present invention comprises a first high-tension shaft and a second high-tension shaft. The second high-tension shaft and the first high-tension shaft, as well as the second high-tension shaft and the low-tension shaft, are respectively connected via different force-increasing gear sets. Multiple sets of force-increasing gear sets can be provided through the provision of two high-tension shafts. The multiple sets of force-increasing gear sets can achieve multiple superimposed force-increasing effects, thereby being able to meet the demand for higher tensioning force under the state of high-tension output;

[0025] (4) The present invention connects the second clutch and the third clutch to the two ends of the first high-tension shaft respectively, and can use the second clutch to control whether power is input, and use the third clutch to control whether the high-tension tensioning process is paused, so that during the high-tension tensioning process, multiple cycles of "high tension-pause" can be adopted to achieve multiple tensioning effects, so that the force transmission of the corners of the goods is more uniform, and the wrapped goods are tighter and safer;

[0026] (5) The present invention is provided with a fourth clutch between the fourth large gear and the low-tension shaft. The engagement or release of the fourth clutch can control the on / off of the power connection between the fourth large gear and the low-tension shaft, thereby avoiding the need to drive the high-tension shaft to rotate and cause energy loss when the low-tension output is in progress. When the high-tension output is in progress, the amplified torque can be transmitted to the low-tension shaft for output. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the power-increasing gear set of the present invention;

[0030] Figure 3 It is the principle diagram of the power amplification gear set of the present invention;

[0031] Among them, 1. low-tension shaft; 11. first clutch; 12. fourth large gear; 13. fourth clutch; 2. first high-tension shaft; 21. second clutch; 22. third clutch; 23. first small gear; 24. third small gear; 25. second large gear; 3. second high-tension shaft; 31. second small gear; 32. fourth small gear; 33. third large gear; 34. first large gear; 4. high-tension wheel; 5. low-tension wheel; 6. driving wheel; 7. support; 8. driving pulley; 9. belt. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The purpose of the present invention is to provide a strapping tensioning device and a strapping tensioning method thereof, so as to solve the problems existing in the prior art. By setting a low-tension wheel and a high-tension wheel, and relying on the engaged state of a first clutch and a second clutch to achieve low-tension or high-tension output, different tension sizes can be used in different stages of strapping, thereby meeting the high requirements for tension in the process of tightening the strapping, and achieving a more compact packaging effect.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figures 1 to 3As shown, the present invention provides a strapping tensioning device, including a support 7 and a low tension shaft 1 and a high tension shaft rotatably mounted on the support 7, wherein the support 7 may include two separate parts, respectively supporting the two ends of each tension shaft, so as to facilitate the installation of the low tension shaft 1 and the high tension shaft, and both the low tension shaft 1 and the high tension shaft can be installed on the support 7 through bearings. A force-increasing gear set is connected between the low tension shaft 1 and the high tension shaft for increasing the torque from the high tension shaft to the low tension shaft 1. The force-increasing gear set mentioned here may refer to a gear set that increases the torque by meshing a small gear with a large gear. Through the setting of the force-increasing gear set, when the high tension shaft is driven to rotate, the amplified torque can be transmitted to the low tension shaft 1. It should be noted that a fourth clutch 13 for controlling the power on and off can also be provided between the force-increasing gear set and the low tension shaft 1, so that when the low tension is output, the high tension shaft will not be driven to rotate and cause energy waste. One or more high-tension shafts may be provided. When only one high-tension shaft is provided, only one set of force-increasing gear sets may be provided. When multiple high-tension shafts are provided, multiple sets of force-increasing gear sets may be provided. The low-tension shaft 1 is connected to a driving pulley 8 for conveying the strapping tape. The connection may be made by a coupling in the axial direction or by gear meshing. When the low-tension shaft 1 is driven to rotate, the low-tension shaft 1 can output a low torque (for the low tension of the strapping tape) to the driving pulley 8. When the high-tension shaft is driven to rotate, the low-tension shaft 1 can output a high torque (for the high tension of the strapping tape) to the driving pulley 8. In order to realize the non-simultaneous driving of the low-tension shaft 1 and the high-tension shaft, and the independent rotation of the low-tension shaft 1 and the high-tension shaft, a first clutch 11 and a second clutch 21 are respectively arranged at the ends of the low-tension shaft 1 and the high-tension shaft, and the first clutch 11 and the second clutch 21 are respectively connected to the low-tension wheel 5 and the high-tension wheel 4. When the first clutch 11 is engaged, the low-tension wheel 5 rotates synchronously with the low-tension shaft 1, and when the second clutch 21 is engaged, the high-tension wheel 4 rotates synchronously with the high-tension shaft. It should be noted that the first clutch 11 and the second clutch 21 can adopt friction clutch, electromagnetic clutch and other types, preferably electromagnetic clutch, which can effectively control the engagement or release of the first clutch 11 and the second clutch 21, so as to realize the precise switching and control of whether the low-tension shaft 1 and the high-tension shaft are driven. Both the low-tension wheel 5 and the high-tension wheel 4 are dynamically connected to the same driving wheel 6, that is, the same driving wheel 6 can be used to drive the low-tension wheel 5 and the high-tension wheel 4 respectively; as for the drive connection method between the driving wheel 6 and the low-tension wheel 5 and the high-tension wheel 4, a gear meshing method, a sprocket chain method, or a belt 9 and a pulley method can be used; the driving wheel 6 can be connected to an electric motor or a hydraulic motor, wherein the hydraulic motor can generate a greater torque output, that is, a greater torque force can be provided starting from the output end of the driving wheel 6, ultimately achieving a greater high-tension tightening effect.The present invention realizes the output of low tension or high tension by providing a low tension wheel 5 and a high tension wheel 4 and relying on the engaged state of the first clutch 11 and the second clutch 21. Different tensions can be used at different stages of belt winding, thereby meeting the high requirements for tension in the process of tightening the strapping belt and achieving a more compact packaging effect.

[0036] like Figure 1 As shown, the driving wheel 6, the low-tension wheel 5 and the high-tension wheel 4 are sleeved in the same belt 9 to realize the driving connection. That is to say, through the setting of the belt 9, the low-tension wheel 5 and the high-tension wheel 4 are driven by the same driving wheel 6. In order to ensure the tension state of the belt 9 so as to better transmit power, a tensioning device can also be provided. The tensioning device is provided with a tensioning wheel, which can adjust the tension state of the belt 9. With the participation of the first clutch 11 and the second clutch 21, the present invention can realize the use of a belt 9 to transmit power to the low-tension wheel 5 or the high-tension wheel 4 respectively, and the working states of the two do not affect each other, and finally realize the rotation drive of the low-tension shaft 1 and the high-tension shaft, and realize the power output of low tension and high tension.

[0037] Combination Figure 2 As shown, the end of the high-tension shaft away from the second clutch 21 is connected to the third clutch 22. When the third clutch 22 is engaged, the high-tension shaft can stop rotating. At this time, the third clutch 22 is equivalent to a braking device. Therefore, through the setting of the third clutch 22, the braking control of the high-tension shaft can be achieved, and then the pause in the tightening process of the strapping belt can be achieved, thereby realizing multiple high-tension tightening working modes.

[0038] like Figures 1 to 3 As shown, the high-tension shaft may include a first high-tension shaft 2 and a second high-tension shaft 3. The arrangement of the first high-tension shaft 2 and the second high-tension shaft 3, relative to the arrangement of a single high-tension shaft, can be used to arrange more force-increasing gear sets to achieve a greater torque amplification effect. The second high-tension shaft 3 is a high-tension shaft for intermediate force transmission, rotatably mounted on the support 7, the first high-tension shaft 2 is a high-tension shaft for receiving power input from the driving wheel 6, and is connected to a second clutch 21 and a third clutch 22 at both ends thereof, respectively. The second high-tension shaft 3 and the first high-tension shaft 2 and the second high-tension shaft 3 and the low-tension shaft 1 are connected respectively through different force-increasing gear sets, and at least one force-increasing gear set can be arranged respectively, that is, at least two torque amplification effects can be achieved, and more force-increasing gear sets can be arranged as needed, and multiple force-increasing gear sets can achieve multiple superimposed force-increasing effects, so that the demand for higher tension can be met under the state of high-tension output.

[0039] like Figure 1As shown, the first high-tension axis 2, the second high-tension axis 3 and the low-tension axis 1 are arranged in a triangle. Compared with the arrangement in the same plane, the installation position of each axis can be reasonably planned to achieve reasonable use of space, thereby achieving a compact layout and reducing the size of the overall structure.

[0040] like Figure 2 and Figure 3As shown, the booster gear set may include a first booster gear set, a second booster gear set, a third booster gear set and a fourth booster gear set, each booster gear set includes a small gear and a large gear, and the torque is amplified by the small gear meshing with the large gear. Among them, the first booster gear set includes a first small gear 23 and a first large gear 34 that are meshed together, the second booster gear set includes a second small gear 31 and a second large gear 25 that are meshed together, the third booster gear set includes a third small gear 24 and a third large gear 33 that are meshed together, and the fourth booster gear set includes a fourth small gear 32 and a fourth large gear 12 that are meshed together. It should be noted that the gear size of each booster gear set needs to be reasonably designed and adjusted according to the relative installation position to ensure reliable meshing; in addition, the diameter ratio between each small gear and the large gear is also calculated and adjusted according to the multiple of torque amplification. In order to realize the installation of four sets of force-increasing gear sets by utilizing the three shafts of the first high-tension shaft 2, the second high-tension shaft 3 and the low-tension shaft 1, it is necessary to reasonably set the connection relationship between each force-increasing gear set and between each force-increasing gear set and each tension shaft. Specifically, the first high-tension shaft 2 is fixedly connected to the first pinion 23, and is rotationally connected to the second large gear 25 and the third small gear 24, and the second large gear 25 and the third small gear 24 are fixedly connected; the second high-tension shaft 3 is fixedly connected to the first large gear 34 and the second small gear 31, and is rotationally connected to the third large gear 33 and the fourth small gear 32, and the third large gear 33 and the fourth small gear 32 are fixedly connected; the low-tension shaft 1 is connected to the fourth large gear 12 through the fourth clutch 13, and the engagement or release of the fourth clutch 13 can control whether the fourth large gear 12 and the low-tension shaft 1 are in motion. The fourth clutch 13 is connected by force, so that when the low tension is output, the fourth clutch 13 is released, and the low tension wheel 5 outputs power to the driving pulley 8 through the low tension shaft 1. At this time, the connection between the low tension shaft 1 and the high tension shaft is disconnected, thereby avoiding the waste of energy caused by the high tension shaft rotating when the low tension is output. When the high tension is output, the fourth clutch 13 is engaged, and the high tension wheel 4 outputs power to the fourth large gear 12 through the high tension shaft, and then outputs power to the low tension shaft 1 through the fourth large gear 12. Finally, the low tension shaft 1 outputs power to the driving pulley 8, thereby completing the high tension output. Among them, the fixed connection between the gear and the tension shaft can be fixed by a keyway combined with a shaft sleeve or a shaft shoulder, the rotational relationship between the gear and the tension shaft can be fixed by setting a bearing, and the fixed connection between the gears can be in the form of a hollow gear shaft with a plurality of gears (rotatably sleeved on the tension shaft by bearings, etc.).

[0041] The first booster gear set, the third booster gear set, the fourth booster gear set and the second booster gear set are arranged axially in sequence, wherein the first booster gear set is arranged near the low tension wheel 5, and the second booster gear set is arranged far away from the low tension wheel 5. Accordingly, the first pinion 23, the third pinion 24, the fourth pinion 32 and the second pinion 31 are arranged in sequence, and the first large gear 34, the third large gear 33, the fourth large gear 12 and the second large gear 25 are arranged in sequence. Figure 3 As shown, in the path of realizing large torque transmission, the torque is first transmitted from the first pinion 23 to the first large gear 34, skipping the third large gear 33 and the fourth pinion 32, and transmitted to the second large gear 25 via the second pinion 31, and the second large gear 25 is coaxially transmitted to the third pinion 24, and then transmitted to the third large gear 33, and the third large gear 33 is coaxially transmitted to the fourth pinion 32, and finally transmitted to the fourth large gear 12. Finally, a ring-shaped transmission path is formed, and such a setting can make the arrangement of each power-increasing gear set more compact, which is conducive to the use of space and reduces the overall structure size of the baler.

[0042] Combination Figures 1 to 3 As shown, the present invention also provides a strapping belt tightening method, which can apply the strapping belt tightening device described above, comprising the following steps:

[0043] The strapping tape is first conveyed so that it passes around the goods or objects to be packaged. After the strapping tape is conveyed into place, the head end (i.e., the free end) of the strapping tape is compressed, and then the strapping tape is retracted, i.e., the tail end (infinite end) of the strapping tape is recovered. During the retracting process, the tensioning operation is performed simultaneously, wherein the same active pulley 8 can be used for the retracting and tensioning.

[0044] In the process of belt winding, low-tension tightening is performed first, that is, at this time, the low-tension shaft 1 needs to be driven to rotate, the first clutch 11 needs to be controlled to engage, the second clutch 21 needs to be released, the third clutch 22 needs to be released, and the fourth clutch 13 needs to be released. At this time, the low-tension wheel 5 is fixedly connected to the low-tension shaft 1, and the high-tension wheel 4 is movably connected to the high-tension shaft (first high-tension shaft 2), that is, the driving wheel 6 is dynamically connected to the low-tension shaft 1, and is dynamically disconnected from the high-tension shaft (first high-tension shaft 2). At this time, the driving wheel 6 can be used to drive the low-tension wheel 5 to rotate, and then the driving wheel 6 drives the low-tension shaft 1 to rotate through the low-tension wheel 5, and the low-tension shaft 1 drives the driving pulley 8 to rotate, so as to perform low-tension tightening.

[0045] After completing the low-tension tightening, high-tension tightening is performed. To determine whether the low-tension tightening is completed, the code disk can be set to control the action of each clutch when the rotation frequency value is detected to be lower than the preset value. Specifically, the first clutch 11 is kept engaged, the second clutch 21 is engaged, the third clutch 22 is released, and the fourth clutch 13 is engaged. At this time, the low-tension wheel 5 is fixedly connected to the low-tension shaft 1, and the high-tension wheel 4 is fixedly connected to the high-tension shaft (the first high-tension shaft 2), that is, the driving wheel 6 is dynamically connected to the high-tension shaft (the first high-tension shaft 2) and the low-tension shaft 1. At this time, the driving wheel 6 can be used to simultaneously drive the high-tension wheel 4 and the low-tension wheel 5 to rotate, and then the driving wheel 6 drives the high-tension shaft (the first high-tension shaft 2) to rotate through the high-tension wheel 4, and drives the low-tension shaft 1 to rotate through the low-tension wheel 5. The high-tension shaft (the first high-tension shaft 2 and the second high-tension shaft 3) drives the low-tension shaft 1 to rotate through the force-increasing gear set, and the low-tension shaft 1 drives the driving pulley 8 to rotate, and high-tension tensioning is performed. When high-tension tensioning is performed, the low-tension tensioning is not cancelled, so that the tension during high-tension tensioning can be further increased.

[0046] After one or more high-tension tightening operations, the strapping belt tightening operation is completed.

[0047] A third clutch 22 is connected to the end of the high-tension shaft (first high-tension shaft 2) away from the second clutch 21. The third clutch 22 can brake the high-tension shaft, and then control whether it is in a pause state. For this reason, the third clutch 22 needs to be released when performing low-tension tensioning and high-tension tensioning. The third clutch 22 needs to be engaged only when multiple tensionings require a pause.

[0048] For the process of multiple tightening, after completing a high-tension tightening, keep the first clutch 11 engaged, keep the fourth clutch 13 engaged, release the second clutch 21, and engage the third clutch 22. At this time, the high-tension wheel 4 is in an idling state, and the high-tension shaft is in a braking state; the low-tension shaft 1 still maintains the power drive with the active pulley 8 to prevent the strapping belt from loosening, that is, the strapping belt is in a high-force pause state, but the low-tension state is not revoked. After the braking state ends, keep the first clutch 11 engaged, keep the fourth clutch 13 engaged, engage the second clutch 21, and release the third clutch 22. At this time, the power of the active wheel 6 can continue to be transmitted to the high-tension wheel 4, and then to the high-tension shaft (the first high-tension shaft 2), and continue to tighten the high-tension, that is, the strapping belt continues to be tightened by high tension. Repeat the steps of the braking state and high-tension tightening, and tighten several times according to the type, style or demand of the packaged goods or the objects to be packaged. The present invention connects the second clutch 21 and the third clutch 22 at both ends of the first high-tension shaft 2 respectively. The second clutch 21 can be used to control whether power is input, and the third clutch 22 can be used to control whether the high-tension tensioning process is paused. Therefore, in the high-tension tensioning process, multiple cycles of "high tension-pause" can be used to achieve multiple tensioning effects, so that the force transmission of the corners of the goods is more uniform, and the wrapped goods are tighter and safer.

[0049] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A strapping tensioning device, characterized in that: It comprises a support, and a low-tension shaft and a high-tension shaft rotatably mounted on the support, a force-increasing gear set for increasing the torque of the high-tension shaft to the low-tension shaft is connected between the low-tension shaft and the high-tension shaft, and the low-tension shaft is connected to a driving pulley for conveying the packing belt; the ends of the low-tension shaft and the high-tension shaft are respectively connected to a low-tension wheel and a high-tension wheel through a first clutch and a second clutch, and the low-tension wheel and the high-tension wheel are both connected to the same driving wheel power; The high-tension shaft includes a first high-tension shaft and a second high-tension shaft, the power-boosting gear set includes a first power-boosting gear set, a second power-boosting gear set, a third power-boosting gear set and a fourth power-boosting gear set, the first power-boosting gear set includes a first pinion and a first large gear meshingly connected, the second power-boosting gear set includes a second pinion and a second large gear meshingly connected, the third power-boosting gear set includes a third pinion and a third large gear meshingly connected, and the fourth power-boosting gear set includes a fourth pinion and a fourth large gear meshingly connected; the first high-tension shaft is fixedly connected to the first pinion, and is rotationally connected to the second large gear and the third pinion, and the second large gear is fixedly connected to the third pinion; the second high-tension shaft is fixedly connected to the first large gear and the second pinion, and is rotationally connected to the third large gear and the fourth pinion, and the third large gear is fixedly connected to the fourth pinion; the low-tension shaft is connected to the fourth large gear via a fourth clutch.

2. The strapping tensioning device according to claim 1, characterized in that: The driving wheel, the low-tension wheel and the high-tension wheel are sleeved in the same belt to realize driving connection.

3. The strapping tensioning device according to claim 2, characterized in that: The end of the high-tension shaft away from the second clutch is connected with a third clutch. When the third clutch is engaged, the high-tension shaft stops rotating.

4. The strapping tensioning device according to claim 3, characterized in that: The second clutch and the third clutch are respectively connected to both ends of the first high-tension shaft, and the second high-tension shaft and the first high-tension shaft as well as the second high-tension shaft and the low-tension shaft are respectively connected via different force-increasing gear sets.

5. The strapping tensioning device according to claim 4, characterized in that: The first high-tension axis, the second high-tension axis and the low-tension axis are arranged in a triangle.

6. The strapping tensioning device according to claim 5, characterized in that: The first force-boosting gear set, the third force-boosting gear set, the fourth force-boosting gear set and the second force-boosting gear set are axially arranged in sequence.

7. A strapping tightening method, characterized in that: The strapping tensioning device according to any one of claims 1 to 6 comprises the following steps: After the strapping tape is delivered to the destination, the head end of the strapping tape is pressed and the tape is reeled in, and the tightening operation is performed at the same time during the reeling process; The first clutch is engaged, and the second clutch is released, so that the driving wheel drives the low-tension shaft to rotate through the low-tension wheel, and the low-tension shaft drives the driving pulley to rotate, thereby performing low-tension tensioning; Keep the first clutch engaged, and engage the second clutch at the same time, the driving wheel drives the high-tension shaft to rotate through the high-tension wheel, the high-tension shaft drives the low-tension shaft to rotate through the force-increasing gear set, and the low-tension shaft drives the driving pulley to rotate, so as to perform high-tension tensioning; After one or more high-tension tightening operations, the strapping belt tightening operation is completed.

8. The strapping tape tightening method according to claim 7, characterized in that: The end of the high-tension shaft away from the second clutch is connected with a third clutch, and the third clutch is released both when low-tension tensioning and high-tension tensioning are performed.

9. The strapping tape tightening method according to claim 8, characterized in that: After completing a high-tension tensioning, keep the first clutch engaged, release the second clutch, engage the third clutch, and the high-tension shaft is in a braking state; after the braking state ends, keep the first clutch released, engage the second clutch, release the third clutch, and continue the high-tension tensioning; repeat the braking state and high-tension tensioning steps and perform several tensionings.

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