Tightness adjusting mechanism for packing belt

Abstract

According to the technical scheme, the packing belt tightness adjusting mechanism is characterized by comprising a rack, a belt conveying driving wheel, a belt conveying driven wheel, a tightening driving wheel and a tightening driven wheel are arranged on the rack, a first gap is formed between the belt conveying driving wheel and the belt conveying driven wheel, and a second gap is formed between the tightening driving wheel and the tightening driven wheel; a first eccentric shaft and a second eccentric shaft are arranged on the machine frame, the belt feeding driven wheel and the tightening driven wheel are arranged on the first eccentric shaft and the second eccentric shaft respectively, a first swing rod is arranged on the first eccentric shaft, a second swing rod is arranged on the second eccentric shaft, and the machine further comprises a driving assembly used for adjusting the rotation angle of the first swing rod and the rotation angle of the second swing rod. Mechanical structures such as the eccentric shaft and the swing rod are used, the material cost is relatively low, influences of factors such as electromagnetic interference and voltage fluctuation are avoided, stable operation of the tightness adjusting mechanism of the packing machine is guaranteed, tightness adjusting can be achieved through the adjusting block, and the device is compatible with packing belts of different thicknesses.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery technology, and more specifically to a strapping tension adjustment mechanism. Background Technology

[0002] The tension adjustment mechanism of a strapping machine is usually used to adjust the distance between the tensioning roller and the tensioning driven roller, as well as between the belt feeding roller and the belt feeding driven roller. Its function is to adjust the tension of the strapping at different points, so that the strapping can be quickly delivered to the next strapping operation, thus optimizing the strapping machine's fast belt feeding process.

[0003] However, existing packing machines typically use electromagnets for tension adjustment. Continuous use has revealed that electromagnets require a constant power supply to maintain their magnetism, resulting in high energy consumption and operating costs over extended periods. Furthermore, fluctuations in power supply voltage and changes in ambient temperature can affect the magnetic field strength of the electromagnet, leading to poor stability and impacting packing efficiency. Utility Model Content

[0004] To solve the above problems, this utility model provides the following technical solution:

[0005] A strapping tension adjustment mechanism includes a frame, on which are mounted a feeding drive wheel, a feeding driven wheel, a tightening drive wheel, and a tightening driven wheel. A first gap is formed between the feeding drive wheel and the feeding driven wheel, and a second gap is formed between the tightening drive wheel and the tightening driven wheel. The strapping passes through the first gap and the second gap sequentially. A first eccentric shaft and a second eccentric shaft are mounted on the frame. The feeding driven wheel and the tightening driven wheel are respectively mounted on the first eccentric shaft and the second eccentric shaft. When the first eccentric shaft rotates, it causes the feeding driven wheel to move away from or closer to the feeding drive wheel, thus changing the size of the first gap. When the second eccentric shaft rotates, it causes the tightening driven wheel to move away from or closer to the tightening drive wheel, thus changing the size of the second gap. A first rocker arm is mounted on the first eccentric shaft for rotating it, and a second rocker arm is mounted on the second eccentric shaft for rotating it. The mechanism also includes a drive assembly for adjusting the rotation angle of the first rocker arm and the second rocker arm.

[0006] The present invention is further configured such that: the belt feeding passive wheel is located above the belt feeding active wheel, and the tightening passive wheel is located below the tightening active wheel; or, the belt feeding passive wheel is located below the belt feeding active wheel, and the tightening passive wheel is located above the tightening active wheel.

[0007] The present invention is further configured such that: the driving assembly includes a passive shaft mounted on a frame, a first lever and a second lever rotatably connected to the passive shaft, the first lever being connected to a first rocker arm, the second lever being connected to a second rocker arm, and a driving motor. The output shaft of the driving motor is provided with a first cam and a second cam. When the output shaft of the driving motor rotates, the first cam drives the first lever to rotate, thereby indirectly driving the first rocker arm to rotate, and the second cam drives the second lever to rotate, thereby indirectly driving the second rocker arm to rotate.

[0008] The present invention is further configured such that: the first lever and the second lever are perpendicular to the passive shaft, one end of the first lever and the second lever are rotatably connected to the passive shaft, the contact point between the first lever and the first cam is close to the passive shaft, and the contact point between the second lever and the second cam is close to the passive shaft.

[0009] The present invention is further configured such that: both the first lever and the second lever are provided with rotating wheels, and the first cam and the second cam respectively contact the first lever and the second lever through the rotating wheels.

[0010] The present invention is further configured such that: an adjusting column is provided on the first lever, and when the first lever rotates upward, the adjusting column lifts the first swing rod to rotate upward; a driving tension spring is connected between the second lever and the second swing rod, and when the second lever rotates upward, the driving tension spring pulls the second swing rod to rotate upward.

[0011] The present invention is further configured such that: the first pendulum rod is perpendicular to the first eccentric shaft, and the second pendulum rod is perpendicular to the second eccentric shaft.

[0012] The present invention is further configured such that: the contact point between the first rocker arm and the adjusting column is close to the end of the first rocker arm away from the first eccentric shaft, and the connection point between the second rocker arm and the driving tension spring is close to the end of the second rocker arm away from the second eccentric shaft.

[0013] The present invention is further configured such that: an adjusting block is provided at the top of the adjusting column, and an incised opening is provided on the adjusting block; the first swing rod passes through the incised opening; an adjusting bolt is threaded on the adjusting block and located below the first swing rod in the vertical direction; the adjusting bolt passes through the incised opening from the bottom of the adjusting block and contacts the first swing rod.

[0014] The present invention is further configured such that: a strapping motor is provided on the frame, the output shaft of the strapping motor is connected to the belt feeding drive wheel or the tightening drive wheel, and the belt feeding drive wheel and the tightening drive wheel are driven by a belt.

[0015] Compared with the prior art, the present invention has at least the following advantages:

[0016] 1. Compared with the original electromagnet mechanism, the use of mechanical structures such as eccentric shafts and swing arms results in relatively low material costs, reliable and simple manufacturing processes, and lower costs; the performance and state of the mechanical structure are relatively stable and are not affected by electromagnetic interference, voltage fluctuations, or other factors, ensuring the stable operation of the tension adjustment mechanism of the baler.

[0017] 2. Since the tension needs to be adjusted by alternating between loosening and tightening, the position design of the feeding passive wheel and the tightening passive wheel allows the feeding passive wheel and the tightening passive wheel to rise or fall simultaneously, thus achieving a tight-loosening of the strapping strap's front and rear positions. This simplifies the mechanical structure of the drive assembly and makes the operation more stable.

[0018] 3. The lever mechanism adopts a structure design that combines a rotating wheel and a cam, which converts sliding friction into rolling friction, significantly reducing wear on moving parts, extending service life, and reducing energy loss caused by frictional resistance, thereby further improving energy efficiency. Attached Figure Description

[0019] Figure 1 This is an overall schematic diagram from the frontal view of this embodiment;

[0020] Figure 2 This is an overall schematic diagram from the rear view of this embodiment;

[0021] Figure 3 This is a partial structural diagram from the rear view of this embodiment;

[0022] Figure 4 This is the first view of the driving component;

[0023] Figure 5 This is the second perspective view of the driving component.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Frame; 2. Feed drive wheel; 3. Feed driven wheel; 4. Tension drive wheel; 5. Tension driven wheel; 6. First eccentric shaft; 7. Second eccentric shaft; 8. First rocker arm; 9. Second rocker arm; 10. Fastening motor; 11. First lever; 12. Second lever; 13. Drive motor; 14. Main shaft; 15. First cam; 16. Second cam; 17. Rotating wheel; 18. Adjusting column; 19. Drive tension spring; 20. Return tension spring; 21. Fixing pin; 22. Adjusting block; 23. Adjusting bolt. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] A strapping tension adjustment mechanism, such as Figure 1 As shown, the machine includes a frame 1, on which a feeding drive wheel 2, a feeding passive wheel 3, a tightening drive wheel 4, and a tightening passive wheel 5 are provided. A first gap is formed between the feeding drive wheel 2 and the feeding passive wheel 3, and a second gap is formed between the tightening drive wheel 4 and the tightening passive wheel 5. When the packaging machine is running, the packaging strap passes through the first gap and the second gap in sequence.

[0029] like Figures 2 to 5 As shown, a first eccentric shaft 6 and a second eccentric shaft 7 are provided on the frame 1. The belt feeding passive wheel 3 is provided on the first eccentric shaft 6, and the tightening passive wheel 5 is provided on the second eccentric shaft 7. Through the eccentric wheel structure at the end of the eccentric shaft, when the first eccentric shaft 6 rotates, it drives the belt feeding passive wheel 3 away from or closer to the belt feeding active wheel 2, causing the size of the first gap to change. Similarly, when the second eccentric shaft 7 rotates, it drives the tightening passive wheel 5 away from or closer to the tightening active wheel 4, causing the size of the second gap to change.

[0030] A first eccentric shaft 6 is provided with a first swing arm 8 for driving its rotation, and a second eccentric shaft 7 is provided with a second swing arm 9 for driving its rotation. The assembly also includes a drive component for adjusting the rotation angle of the first swing arm 8 and the second swing arm 9. By adjusting the rotation angle of the swing arms through the drive component, the size of the first gap and the second gap are adjusted, achieving a tightening and loosening of the strapping strap at the front and back, thus enabling the strapping strap to be quickly delivered to its position.

[0031] In this embodiment, the feed passive wheel 3 is located above the feed active wheel 2, and the tightening passive wheel 5 is located below the tightening active wheel 4. This ensures that when the feed passive wheel 3 moves downward, it approaches the feed active wheel 2, while when the tightening passive wheel 5 moves downward, it moves away from the tightening active wheel 4. Therefore, the drive assembly only needs to adjust both the feed passive wheel 3 and the tightening passive wheel 5 downward simultaneously to achieve a tighter and looser first gap and a looser second gap, simplifying the drive assembly adjustment structure. In other embodiments, the feed passive wheel 3 can also be located below the feed active wheel 2, and the tightening passive wheel 5 can be located above the tightening active wheel 4. In this case, the drive assembly adjusts both the feed passive wheel 3 and the tightening passive wheel 5 upward simultaneously.

[0032] The drive assembly includes a passive shaft mounted on the frame 1, with a first lever 11 and a second lever 12 rotatably connected to the passive shaft. The first lever 11 is connected to a first rocker arm 8, and the second lever 12 is connected to a second rocker arm 9. The drive assembly also includes a drive motor 13, with a main shaft 14 connected to the output shaft of the drive motor 13. The main shaft 14 is equipped with a first cam 15 and a second cam 16. When the output shaft of the drive motor 13 rotates, the first cam 15 on the main shaft 14 drives the first lever 11 to rotate, thereby indirectly driving the first rocker arm 8 to rotate. The second cam 16 drives the second lever 12 to rotate, thereby indirectly driving the second rocker arm 9 to rotate.

[0033] The first lever 11 and the second lever 12 are perpendicular to the passive shaft. One end of the first lever 11 and the second lever 12 is rotatably connected to the passive shaft. Specifically, the first lever 11 and the second lever 12 are overlapped and sleeved on the passive shaft, rotating around the passive shaft. The first cam 15 and the second cam 16 are overlapped and sleeved and fixed on the output shaft of the drive motor 13, rotating synchronously with the output shaft of the drive motor 13. The two cams correspond one-to-one with the two levers. In this embodiment, the contact point between the first lever 11 and the first cam 15 is close to the passive shaft, and the contact point between the second lever 12 and the second cam 16 is also close to the passive shaft. This allows the levers to rotate at a larger angle when the cams rotate and lift them, reducing the cam size and optimizing space utilization.

[0034] A drive spring 20 is also connected to the first rocker arm 8. The bottom of the drive spring 20 is connected to the fixing pin 21 at the bottom of the frame 1. Similarly, a drive spring 20 is also connected to the second rocker arm 9. The other end of the drive spring 20 on the second rocker arm 9 is connected to the equipment below the frame 1. The drive spring 20 is used to pull down the first rocker arm 8 and the second rocker arm 9 when the cam does not push up the lever.

[0035] Both the first lever 11 and the second lever 12 are equipped with rotating wheels 17. The first cam 15 and the second cam 16 contact the first lever 11 and the second lever 12 respectively through the rotating wheels 17. This converts sliding friction into rolling friction, significantly reducing wear on moving parts, extending service life, and reducing energy loss due to frictional resistance, thereby further improving energy efficiency.

[0036] The first lever 11 is located below the first rocker arm 8. An adjusting column 18 is vertically installed on the first lever 11. When the first lever 11 rotates upward, the adjusting column 18 lifts the first rocker arm 8, causing the first rocker arm 8 to rotate upward. The second lever 12 is located above the second rocker arm 9. A return spring 19 is connected between the second lever 12 and the second rocker arm 9. When the second lever 12 rotates upward, the return spring 19 pulls the second rocker arm 9 to rotate upward.

[0037] The first pendulum 8 is perpendicular to the first eccentric shaft 6, and the second pendulum 9 is perpendicular to the second eccentric shaft 7. Both pendulums extend in a direction perpendicular to the eccentric shaft, so that the pendulums can more easily drive the eccentric shaft to rotate.

[0038] The contact point between the first rocker arm 8 and the adjusting column 18 is close to the end of the first rocker arm 8 away from the first eccentric shaft 6, and the connection point between the second rocker arm 9 and the drive tension spring 19 is close to the end of the second rocker arm 9 away from the second eccentric shaft 7. This makes the rotation point and connection point of the eccentric shaft close to both ends, making the adjustment easier and more sensitive.

[0039] An adjusting block 22 is provided at the top of the adjusting column 18. A C-shaped opening is provided through the side wall of the adjusting block 22. The first rocker arm 8 passes through the C-shaped opening. An adjusting bolt 23 is threaded vertically onto the adjusting block 22. The adjusting bolt 23 passes through the C-shaped opening from the bottom of the adjusting block 22 and abuts against the first rocker arm 8. When the adjusting bolt 23 is adjusted upward or downward, the drive spring 19 at the end of the first rocker arm 8 tends to pull the first rocker arm 8 downward. When the adjusting bolt 23 moves upward, it will push the first rocker arm 8 upward, causing the first rocker arm 8 to rotate upward. During the rotation of the first rocker arm 8, it overcomes the tension of the drive spring 19. When the adjusting bolt 23 moves downward, the drive spring 19 rebounds and pulls downward, causing the first rocker arm 8 to rotate downward, so that the first rocker arm 8 is always in contact with the adjusting bolt 23.

[0040] When staff need to use strapping of different materials and specifications, they can adjust the tension by rotating the adjusting nut 23. Rotating the adjusting nut 23 clockwise causes the first swing arm 8 to rotate upward, moving the passive feeding wheel 3 away from the active feeding wheel 2, increasing the first gap and reducing the tension of the strapping machine, which is suitable for thicker strapping. Rotating the adjusting nut 23 counterclockwise causes the first swing arm 8 to rotate downward, moving the passive feeding wheel 3 closer to the active feeding wheel 2, decreasing the first gap and increasing the tension of the strapping machine, which is suitable for thinner strapping. Users can adjust the tension to a suitable level for strapping of different materials and specifications before use to avoid strapping breakage, excessive looseness, or other issues that affect the packaging quality.

[0041] Since the adjusting block 22 has an incised opening, when the first rocker arm 8 rotates upward to a certain angle, it will abut against the top of the incised opening, which limits the rotation angle and stroke of the first rocker arm 8, making the adjustment more stable and precise. At the same time, it also has a certain limiting effect on the lateral displacement of the first rocker arm 8 during rotation.

[0042] A strapping motor 10 is mounted on the frame 1. The output shaft of the strapping motor 10 is connected to either the feeding drive wheel 2 or the tightening drive wheel 4. The feeding drive wheel 2 and the tightening drive wheel 4 are driven by a belt. In this embodiment, the output shaft of the strapping motor 10 is fixed to the tightening drive wheel 4, driving the tightening drive wheel 4 to rotate. The tightening drive wheel 4 causes the feeding drive wheel 2 to rotate synchronously via a belt. A gear meshes between the tightening driven wheel 5 and the tightening drive wheel 4, causing the tightening driven wheel 5 to rotate accordingly. The second gap serves as the main source of friction for the input strapping.

[0043] The working process of this utility model is as follows:

[0044] When a user uses the packing machine to pack goods, the drive motor 13 drives the first cam 15 and the second cam 16 to rotate via the main shaft 14. When the first cam 15 and the second cam 16 rotate to their lowest points, the first lever 11 and the second lever 12 rotate downwards, driving the tension spring 20 to pull the first rocker arm 8 downwards, causing the feeding passive wheel 3 to move closer to the feeding active wheel 2, thus reducing the first gap. The drive spring 20 then pulls the second rocker arm 9 downwards, causing the tightening passive wheel 5 to move away from the tightening active wheel 4, thus increasing the second gap. At this time, the strapping motor 10 drives the tightening active wheel 4 and the feeding active wheel 2 to move the packing strap. The back-and-forth tightening and loosening allows the packing strap to be quickly delivered to the correct position, achieving rapid strapping.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A strapping tension adjustment mechanism, comprising a frame, wherein a feeding drive wheel, a feeding driven wheel, a tightening drive wheel, and a tightening driven wheel are disposed on the frame, a first gap is formed between the feeding drive wheel and the feeding driven wheel, and a second gap is formed between the tightening drive wheel and the tightening driven wheel, wherein the strapping band passes through the first gap and the second gap sequentially, characterized in that: The frame is provided with a first eccentric shaft and a second eccentric shaft. The belt feeding passive wheel and the tightening passive wheel are respectively disposed on the first eccentric shaft and the second eccentric shaft. When the first eccentric shaft rotates, it drives the belt feeding passive wheel away from or towards the belt feeding drive wheel, causing a change in the size of the first gap. When the second eccentric shaft rotates, it drives the tightening passive wheel away from or towards the tightening drive wheel, causing a change in the size of the second gap. The first eccentric shaft is provided with a first rocker arm for driving its rotation, and the second eccentric shaft is provided with a second rocker arm for driving its rotation. The frame also includes a drive assembly for adjusting the rotation angle of the first rocker arm and the second rocker arm.

2. The packing strap tension adjustment mechanism according to claim 1, characterized in that: The belt feeding passive wheel is located above the belt feeding active wheel, and the tightening passive wheel is located below the tightening active wheel; or, the belt feeding passive wheel is located below the belt feeding active wheel, and the tightening passive wheel is located above the tightening active wheel.

3. The packing strap tension adjustment mechanism according to claim 1, characterized in that: The drive assembly includes a passive shaft mounted on a frame, on which a first lever and a second lever are rotatably connected. The first lever is connected to a first rocker arm, and the second lever is connected to a second rocker arm. The drive assembly also includes a drive motor, on which a first cam and a second cam are mounted. When the output shaft of the drive motor rotates, the first cam drives the first lever to rotate, thereby indirectly driving the first rocker arm to rotate. The second cam drives the second lever to rotate, thereby indirectly driving the second rocker arm to rotate.

4. The packing strap tension adjustment mechanism according to claim 3, characterized in that: The first lever and the second lever are perpendicular to the passive shaft. One end of the first lever and the second lever are rotatably connected to the passive shaft. The contact point between the first lever and the first cam is close to the passive shaft, and the contact point between the second lever and the second cam is close to the passive shaft.

5. The packing strap tension adjustment mechanism according to claim 3, characterized in that: Both the first lever and the second lever are provided with rotating wheels, and the first cam and the second cam respectively contact the first lever and the second lever through the rotating wheels.

6. The packing strap tension adjustment mechanism according to claim 5, characterized in that: An adjusting column is provided on the first lever. When the first lever rotates upward, the adjusting column lifts the first swing rod and makes it rotate upward. A driving tension spring is connected between the second lever and the second swing rod. When the second lever rotates upward, the driving tension spring pulls the second swing rod to rotate upward.

7. The packing strap tension adjustment mechanism according to claim 6, characterized in that: The first pendulum is perpendicular to the first eccentric axis, and the second pendulum is perpendicular to the second eccentric axis.

8. The packing strap tension adjustment mechanism according to claim 7, characterized in that: The contact point between the first rocker arm and the adjusting column is near the end of the first rocker arm that is away from the first eccentric shaft, and the connection point between the second rocker arm and the drive tension spring is near the end of the second rocker arm that is away from the second eccentric shaft.

9. A strapping tension adjustment mechanism according to claim 6, characterized in that: An adjusting block is provided at the top of the adjusting column. The adjusting block has an incised opening. The first swing rod passes through the incised opening. An adjusting bolt is threaded vertically onto the adjusting block and below the first swing rod. The adjusting bolt passes through the incised opening from the bottom of the adjusting block and contacts the first swing rod.

10. The packing strap tension adjustment mechanism according to claim 1, characterized in that: The frame is equipped with a strapping motor, the output shaft of which is connected to the belt feeding drive wheel or the tightening drive wheel, and the belt feeding drive wheel and the tightening drive wheel are driven by a belt.

Images