Tensioning machine

Abstract

The present application relates to a tensioning machine, comprising: a support, having an accommodating space for accommodating a strapping band; a band shaft, which is rotatably mounted on the support, passes through the accommodating space, and is used for winding and rolling the strapping band; a volute spring, provided on the band shaft and used for making the band shaft have a tendency to rotate in the direction of rolling the strapping band; a deceleration assembly, provided on the band shaft and used for acting on the band shaft when the band shaft rotates in the direction of rolling the strapping band, so as to reduce the rotation speed of the band shaft; and a blocking assembly, provided on the support and used for selectively locking or releasing the rotation of the band shaft. In the tensioning machine designed in the present application, the volute spring and the deceleration assembly are respectively arranged at two ends of the band shaft while a compact structure is ensured, thus rendering the overall layout more reasonable, effectively reducing the mutual interference between parts, and significantly reducing the structural complexity.

Description

tensioning machine Technical Field

[0001] This application relates to the field of tensioner technology, and in particular to a tensioning machine. Background Technology

[0002] Most tensioning machines on the market currently lack the function of automatically retracting the straps. After unloading goods, operators have to spend time tidying up the straps, increasing their workload and working time. For tensioning machines that do have a strap retraction function, the following technical problems often exist: First, existing strap retraction devices cannot effectively control the retraction speed when retracting the straps, which can easily lead to the straps retracting too quickly. Furthermore, the retraction process cannot be stopped at will, causing the metal hook at the front end of the strap to suddenly spring back, posing a safety hazard and potentially causing injury. Second, the existing strap retraction mechanisms are often overly complex in structure, inconvenient to use, and increase operational difficulty and maintenance costs.

[0003] While some existing solutions attempt to solve the problem of strap retrieval by adding a retrieval mechanism, they usually only consider the implementation of the retrieval function and ignore the layout design of the retrieval mechanism itself, directly mixing the power components and deceleration components. This not only increases the structural complexity but also affects the overall operational efficiency and safety. Utility Model Content

[0004] To address the aforementioned issues, this application provides a tensioning machine with a more rational overall layout.

[0005] To achieve the above objectives, the tensioning machine designed in this application includes:

[0006] The support frame has storage space for accommodating the binding straps;

[0007] A shaft, rotatably mounted to the bracket and passing through the receiving space, is used for winding and rewinding the binding strap;

[0008] A spiral spring is provided on the belt shaft to give the belt shaft a tendency to rotate in the direction of winding the binding tape;

[0009] A speed reduction assembly is provided on the belt shaft and is used to act on the belt shaft to reduce the rotation speed of the belt shaft when the belt shaft rotates in the direction of winding the binding tape.

[0010] A blocking component, provided on the bracket, is used to selectively lock or release the rotation of the belt shaft;

[0011] The belt shaft has a first end exposed outside the bracket and a second end disposed opposite to the first end. The spiral spring is disposed at the first end of the belt shaft, and the deceleration assembly is disposed at the second end of the belt shaft.

[0012] Furthermore, the deceleration assembly is configured to act on the belt shaft through friction.

[0013] Furthermore, the deceleration assembly includes a mounting shaft, a deceleration plate, and a first torsion spring sleeved on the mounting shaft and acting on the deceleration plate. The deceleration plate is pivotally connected to the mounting shaft and has a first position. In the first position, the deceleration plate abuts against the outer peripheral surface of the second end of the belt shaft under the action of the first torsion spring.

[0014] Furthermore, the speed reduction plate is provided with two oppositely arranged ears, which are spaced apart and fitted onto the mounting shaft; the first torsion spring is located between the two ears.

[0015] Furthermore, the second end of the belt shaft is provided with knurling to increase friction; or, the second end of the belt shaft is fitted with a gear, the tip of the gear contacting the plate surface of the speed reduction plate on the side away from the first torsion spring.

[0016] Furthermore, the speed reducer has a second position that does not act on the belt shaft, and the speed reducer is provided with an operating handle, which is configured to drive the speed reducer to switch from the first position to the second position.

[0017] Furthermore, a clearance hole is provided on the side wall of the bracket, and the deceleration plate has a first pressing part that extends through the clearance hole to the receiving space; the top of the bracket is provided with an operation window that exposes the first pressing part and the receiving space.

[0018] Furthermore, it also includes a protective shell, which is fixedly installed on the side wall of the bracket and covers the deceleration assembly; one end of the first torsion spring abuts against the upper surface of the deceleration plate, and the other end abuts against the inner wall of the protective shell.

[0019] Furthermore, the blocking component includes:

[0020] A take-up reel with ratchet wheels at both ends is rotatably mounted on the belt shaft;

[0021] A handle with an eccentric wheel, the handle being rotatably mounted to the belt shaft via the eccentric wheel;

[0022] A first anti-reverse plate is provided on the bracket and acts on the ratchet through a compression spring to prevent the take-up reel from rotating in the opposite direction to the take-up binding tape.

[0023] A second anti-reverse plate is provided on the handle and acts on the ratchet through a second torsion spring to prevent the take-up reel from rotating in the opposite direction to the take-up binding tape.

[0024] The handle is configured to drive the eccentric wheel to rotate in the direction of winding the binding tape under the action of external force, so as to drive the first anti-stop plate to switch from the position acting on the ratchet to the position not acting on the ratchet; the second anti-stop plate is provided with a second pressing part, which is used to control the second anti-stop plate to switch from the position acting on the ratchet to the position not acting on the ratchet.

[0025] Furthermore, the second anti-reverse plate has a limiting protrusion protruding from the bracket, and the side wall of the bracket is provided with a guide groove for limiting the movement range of the limiting protrusion.

[0026] The tensioning machine designed in this application, while ensuring a compact structure, places the worm spring and the reduction gear assembly at both ends of the belt shaft. This not only makes the overall layout more reasonable but also effectively reduces mutual interference between components and significantly reduces structural complexity. Specifically, the worm spring provides the belt shaft with a rotational driving force in the direction of winding the binding tape, realizing the automatic recycling function of the binding tape and effectively eliminating the tedious manual handling. At the same time, the reduction gear assembly acts on the belt shaft by friction, which can effectively reduce the rotation speed of the belt shaft, avoid the safety hazards caused by the excessively fast webbing recycling, and improve the reliability and service life of the equipment. Attached Figure Description

[0027] Figure 1 is a structural schematic diagram of the tensioning machine provided in an embodiment of this application.

[0028] Figure 2 is a schematic diagram of the deceleration component provided in an embodiment of this application.

[0029] Figure 3 is a three-dimensional exploded view of Figure 1.

[0030] Figure 4 is a top view of Figure 1.

[0031] Figure 5 is a cross-sectional view at point AA in Figure 4.

[0032] The components include: bracket 10, clearance hole 11, guide groove 12, belt shaft 20, gear 21, worm spring 30, deceleration assembly 40, mounting shaft 41, deceleration plate 42, ear 421, operating handle 422, first pressing part 423, first torsion spring 43, protective shell 44, blocking assembly 50, ratchet 51, belt take-up reel 52, eccentric wheel 53, handle 54, first backstop plate 55, compression spring 56, second backstop plate 57, second pressing part 571, limiting protrusion 572, second torsion spring 58, and operating window 60. Detailed Implementation

[0033] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0034] As shown in Figures 1 to 5, the tensioning machine described in this embodiment mainly includes a bracket 10, a belt shaft 20, a spiral spring 30, a speed reduction assembly 40, and a blocking assembly 50. Through structural design and coordinated operation, these components jointly realize the automatic retraction, speed control, and selective locking functions of the binding strap.

[0035] The bracket 10 has a storage space for accommodating the binding straps. In specific implementation, the bracket 10 is preferably made of high-strength steel by stamping and forming process to form a U-shaped structure as shown in Figure 3. Its two side plates provide a foundation for the installation of other components, which not only ensures the strength and rigidity of the overall structure, but also forms an internal space suitable for accommodating the binding straps, which facilitates the orderly storage of the binding straps.

[0036] The belt shaft 20 is rotatably mounted on the bracket 10 and passes through the receiving space for winding and rewinding the binding strap. The belt shaft 20 has a cylindrical design and may have anti-slip textures on its surface to increase friction with the binding strap, ensuring that the binding strap will not loosen or slip during the winding process. When the belt shaft 20 rotates in a predetermined direction, it can smoothly achieve the winding and rewinding of the binding strap.

[0037] A spiral spring 30 is disposed on the belt shaft 20 to give the belt shaft 20 a tendency to rotate in the direction of winding the binding strap. The spiral spring 30 is preloaded with a certain torque during installation, thereby giving the belt shaft 20 a continuous tendency to rotate in the direction of winding the binding strap. After the external force is released, the spiral spring 30 can automatically drive the belt shaft 20 to rotate, realizing automatic retraction of the binding strap without manual intervention.

[0038] A deceleration component 40 is disposed on the belt shaft 20 and is used to reduce the rotational speed of the belt shaft 20 when it rotates in the direction of winding the binding strap. In this embodiment, the deceleration component 40 acts on the belt shaft 20 through friction, producing an appropriate damping effect. This design effectively avoids the impact, noise, and potential safety hazards that may be caused by rapid winding of the binding strap, making the entire winding process smoother and more controllable.

[0039] A blocking component 50 is disposed on the bracket 10 and is used to selectively lock or release the rotation of the belt shaft 20. By operating the blocking component 50, the user can control the start and stop of the winding process at any time according to actual needs, further improving the flexibility and safety of operation. The detailed structure and working principle of the blocking component 50 will be described in detail later in this embodiment.

[0040] The belt shaft 20 has a first end exposed outside the bracket 10 and a second end opposite to the first end. The worm spring 30 is located at the first end of the belt shaft 20, while the reduction gear 40 is located at the second end of the belt shaft 20. This structural design, which separates the winding power source (worm spring 30) and the resistance control mechanism (reduction gear 40) at both ends of the belt shaft 20, significantly optimizes the overall structural layout. By separating the component that generates the rotational tendency from the component that controls the rotational speed, mutual interference between the two is effectively avoided, allowing their respective functions to be realized more purely. This improves the overall stability and reliability of the system. At the same time, this layout also facilitates the installation, inspection, and maintenance of each component, extending the service life of the equipment.

[0041] In some embodiments, as shown in Figures 2 and 3, the deceleration assembly 40 includes a mounting shaft 41, a deceleration plate 42, and a first torsion spring 43 sleeved on the mounting shaft 41 and acting on the deceleration plate 42. The deceleration plate 42 is pivotally connected to the mounting shaft 41 and has a first position. In the first position, the deceleration plate 42 abuts against the outer peripheral surface of the second end of the belt shaft 20 under the action of the first torsion spring 43. When the belt shaft 20 rotates in the direction of winding the binding strap under the drive of the worm spring 30, the deceleration plate 42 in the first position is subjected to the force of the first torsion spring 43, generating friction between it and the outer peripheral surface of the second end of the belt shaft 20. This effectively hinders the rapid rotation of the belt shaft 20, thereby reducing the rotation speed and allowing the binding strap to be wound smoothly, avoiding potential safety hazards caused by rapid rebound. To improve the friction effect, the contact surface between the deceleration plate 42 and the belt shaft 20 in this embodiment is designed to be arc-shaped. This arc-shaped surface can be a circular arc surface, a parabolic surface, or a curved surface composed of multiple planes, so as to increase the contact area with the belt shaft 20 and improve the deceleration efficiency.

[0042] In specific implementation, as shown in Figures 2 and 3, the deceleration plate 42 is provided with two oppositely arranged ears 421. The two ears 421 are spaced apart and fitted onto the mounting shaft 41. The spaced ears 421 fitted onto the mounting shaft 41 can provide more stable and reliable pivot support, reduce the swaying or tilting of the deceleration plate 42 during the swinging process, and ensure that its contact with the belt shaft 20 is more uniform and stable. The first torsion spring 43 is located between the two ears 421, which can make the overall structure of the deceleration assembly 40 more compact and reduce the space occupied.

[0043] In some embodiments, the second end of the belt shaft 20 is provided with knurling to increase friction. Knurling involves pressing a fine mesh pattern onto the surface of the belt shaft 20, which increases the coefficient of friction of the contact surface. This results in greater frictional resistance when the reduction assembly 40 abuts against the belt shaft 20, achieving a more effective deceleration effect. In another specific embodiment, as shown in Figures 2 and 3, a gear 21 is fitted onto the second end of the belt shaft 20. The tips of the gear 21 contact the side of the reduction plate 42 opposite to the first torsion spring 43. The gear 21 is typically made of high-strength metal material and has excellent wear resistance. By contacting the reduction plate 42 with its tooth tips, it not only reduces direct wear on the surface of the belt shaft 20, but also, as an independent component, can be easily replaced when wear is severe, reducing maintenance costs.

[0044] In some embodiments, as shown in Figures 2 and 3, the deceleration plate 42 has a second position where it does not act on the belt shaft 20. An operating handle 422 is provided on the deceleration plate 42, which is configured to allow the operator to apply external force to drive the deceleration plate 42 to switch between a first position in contact with the belt shaft 20 and a second position where it does not contact the belt shaft 20 or the contact is weakened. Normally, under the action of the first torsion spring 43, the deceleration plate 42 remains in the first position, closely abutting against the outer circumferential surface of the second end of the belt shaft 20, generating frictional resistance and limiting the winding speed. However, in actual operation, it may sometimes be necessary to temporarily increase the winding speed or completely release the deceleration effect. In this case, the operator can press or flick the operating handle 422 to overcome the force of the first torsion spring 43, causing the deceleration plate 42 to pivot around the mounting shaft 41, moving it to the second position. In the second position, the friction between the deceleration plate 42 and the belt shaft 20 will be significantly reduced, or even completely disengaged, allowing the belt shaft 20 to wind the binding tape at a faster speed under the drive of the worm spring 30. For example, in the initial stage of winding, the binding strap may be relatively loose. At this time, the operator can press the operating handle 422 to put the deceleration plate 42 in the second position, which will speed up the initial winding speed and shorten the operation time. As the binding strap gradually tightens, the operator can release the operating handle 422 to allow the deceleration plate 42 to return to the first position under the action of the first torsion spring 43, thereby restricting the winding speed again and preventing the winding from being too fast.

[0045] In some embodiments, as shown in Figures 2 and 3, a clearance hole 11 is provided on the side wall of the bracket 10, and the deceleration plate 42 has a first pressing part 423 extending through the clearance hole 11 into the receiving space; the top of the bracket 10 is provided with an operation window 60 that exposes the first pressing part 423 and the receiving space. With this structural design, the operating end of the operating handle 422, i.e., the first pressing part 423, can be housed inside the receiving space of the bracket 10. Through the operation window 60 on the top of the bracket 10, the operator can still conveniently press the first pressing part 423, effectively avoiding the direct impact of external environmental factors (such as accidental squeezing or collision during binding or transportation) on the first pressing part 423. This significantly improves the reliability and durability of the deceleration control mechanism and reduces the risk of deceleration function failure due to accidental touch or external force.

[0046] In some embodiments, as shown in Figures 2 and 3, a protective shell 44 is further included. The protective shell 44 is fixedly installed on the side wall of the bracket 10 and covers the deceleration assembly 40. One end of the first torsion spring 43 abuts against the upper surface of the deceleration plate 42, and the other end abuts against the inner wall of the protective shell 44. The protective shell 44 effectively covers the key components of the deceleration assembly 40 (such as the mounting shaft 41, the deceleration plate 42, the first torsion spring 43, etc.), preventing external dust, debris, moisture, etc. from entering the interior of the deceleration assembly, avoiding deceleration failure or performance degradation due to foreign object interference, and significantly improving the reliability and durability of the deceleration assembly. In another example, similar to the deceleration assembly, a volute housing for housing the volute spring 30 is also provided on the side where the volute spring 30 is located, to provide protection for the volute spring 30.

[0047] In some embodiments, as shown in Figures 1 to 5, the blocking component 50 includes:

[0048] A take-up reel 52 with ratchet 51 at both ends is rotatably mounted on the belt shaft 20;

[0049] A handle 54 with an eccentric wheel 53 is rotatably mounted to the belt shaft 20 via the eccentric wheel 53;

[0050] A first anti-reverse plate 55 is provided on the bracket 10 and acts on the ratchet 51 through a compression spring 56 to prevent the take-up reel 52 from rotating in the opposite direction to the take-up binding tape.

[0051] The second anti-reverse plate 57 is provided on the handle 54 and acts on the ratchet 51 through a second torsion spring 58 to prevent the take-up reel 52 from rotating in the opposite direction to the take-up binding tape.

[0052] The handle 54 is configured to drive the eccentric wheel 53 to rotate in the direction of winding the binding tape under the action of external force, so as to drive the first anti-reverse plate 55 to switch from the position acting on the ratchet 51 to the position not acting on the ratchet 51; the second anti-reverse plate 57 is provided with a second pressing part 571, which is used to control the second anti-reverse plate 57 to switch from the position acting on the ratchet 51 to the position not acting on the ratchet 51.

[0053] In actual work, please refer to Figure 5:

[0054] During normal operation, the binding straps wound on the rear end of the bracket 10 and the take-up reel 52 are hooked at the target position through the hooks on the front and rear sides of the bracket 10. At this time, the first anti-reverse plate 55 is engaged with the ratchet teeth of the ratchet wheel 51 by the action of the compression spring 56, and the second anti-reverse plate 57 is engaged with the ratchet teeth of the ratchet wheel 51 by the action of the second torsion spring 58, thereby preventing the take-up reel 52 from rotating in the opposite direction (clockwise) to the winding binding strap, ensuring that the goods will not be displaced due to the loose binding strap during transportation.

[0055] When it is necessary to further tighten the bundled goods, by turning the handle 54, the eccentric wheel 53 rotates in the direction of winding the bundle (counterclockwise). The rotation of the eccentric wheel 53 will push the first anti-reverse plate 55 to compress the spring 56 until the first anti-reverse plate 55 disengages from the ratchet 51. At the same time, the second anti-reverse plate 57 provided on the handle 54 remains engaged with the ratchet 51, causing the ratchet 51 and the take-up reel 52 to rotate counterclockwise, thereby shrinking the bundle. By repeatedly turning the handle 54, the bundle can be gradually tightened until the goods are securely bundled.

[0056] When it is necessary to loosen the goods, press the second pressing part 571 to switch the second anti-reverse plate 57 from the position acting on the ratchet 51 to the position not acting on the ratchet 51, that is, the second anti-reverse plate 57 disengages from the ratchet teeth of the ratchet 51. At this time, by turning the handle 54, the eccentric wheel 53 rotates counterclockwise to push the first anti-reverse plate 55 to compress the spring 56 until the first anti-reverse plate 55 disengages from the ratchet teeth of the ratchet 51. At this time, the ratchet 51 and the take-up reel 52 can rotate clockwise or counterclockwise without restriction. The operator can directly move the bracket 10 and pull the strap to loosen it to the required length, thereby conveniently loosening the goods.

[0057] In some embodiments, as shown in Figures 2 and 3, the second backstop 57 has a limiting protrusion 572 protruding from the bracket 10, and a guide groove 12 is provided on the side wall of the bracket 10 to limit the movement range of the limiting protrusion 572. Through the limitation of the guide groove 12, the rotation angle of the second backstop 57, i.e., the handle 54, is limited to a predetermined range, avoiding damage that may be caused by excessive rotation.

[0058] The tensioning machine provided in this embodiment, while ensuring a compact structure, places the worm spring and the deceleration assembly at both ends of the belt shaft. This not only makes the overall layout more reasonable but also effectively reduces mutual interference between components and significantly reduces structural complexity. Specifically, the worm spring provides the belt shaft with a rotational driving force in the direction of winding the binding tape, realizing the automatic recycling function of the binding tape and effectively eliminating the tedious manual handling. At the same time, the deceleration assembly acts on the belt shaft by friction, which can effectively reduce the rotation speed of the belt shaft, avoid the safety hazards caused by the webbing being recycled too quickly, and improve the reliability and service life of the equipment.

[0059] In the description of this application, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0060] In the description of this application, it should also be noted that, unless otherwise expressly 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 application according to the specific circumstances.

[0061] Finally, it should be noted that the above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tensioning machine, characterized in that, include: The support frame has storage space for accommodating the binding straps; A shaft, rotatably mounted to the bracket and passing through the receiving space, is used for winding and coiling the binding strap; A spiral spring is provided on the belt shaft to give the belt shaft a tendency to rotate in the direction of winding the binding tape; A speed reduction assembly is provided on the belt shaft and is used to act on the belt shaft to reduce the rotation speed of the belt shaft when the belt shaft rotates in the direction of winding the binding tape. A blocking component, provided on the bracket, is used to selectively lock or release the rotation of the belt shaft; The belt shaft has a first end exposed outside the bracket and a second end disposed opposite to the first end. The spiral spring is disposed at the first end of the belt shaft, and the deceleration assembly is disposed at the second end of the belt shaft.

2. The tensioning machine according to claim 1, characterized in that, The speed reduction assembly is configured to act on the belt shaft through friction.

3. The tensioning machine according to claim 1, characterized in that, The deceleration assembly includes a mounting shaft, a deceleration plate, and a first torsion spring sleeved on the mounting shaft and acting on the deceleration plate. The deceleration plate is pivotally connected to the mounting shaft and has a first position. In the first position, the deceleration plate abuts against the outer peripheral surface of the second end of the belt shaft under the action of the first torsion spring.

4. The tensioning machine according to claim 3, characterized in that, The speed reduction plate is provided with two oppositely arranged ears, which are spaced apart and fitted onto the mounting shaft; the first torsion spring is located between the two ears.

5. The tensioning machine according to claim 4, characterized in that, The second end of the belt shaft is provided with knurling to increase friction; or, the second end of the belt shaft is fitted with a gear, the tip of the gear contacting the plate surface of the speed reduction plate on the side away from the first torsion spring.

6. The tensioning machine according to claim 4, characterized in that, The speed reducer has a second position where it does not act on the belt shaft, and the speed reducer is provided with an operating handle, which is configured to drive the speed reducer to switch from the first position to the second position.

7. The tensioning machine according to claim 6, characterized in that, The bracket has a clearance hole on its side wall, and the deceleration plate has a first pressing part that extends through the clearance hole to the receiving space; the top of the bracket has an operation window that exposes the first pressing part and the receiving space.

8. The tensioning machine according to claim 3, characterized in that, It also includes a protective shell, which is fixedly installed on the side wall of the bracket and covers the deceleration assembly; one end of the first torsion spring abuts against the upper surface of the deceleration plate, and the other end abuts against the inner wall of the protective shell.

9. The tensioning machine according to any one of claims 1-8, characterized in that, The blocking component includes: A take-up reel with ratchet wheels at both ends is rotatably mounted on the belt shaft; A handle with an eccentric wheel, the handle being rotatably mounted to the belt shaft via the eccentric wheel; A first anti-reverse plate is provided on the bracket and acts on the ratchet through a compression spring to prevent the take-up reel from rotating in the opposite direction to the take-up binding tape. A second anti-reverse plate is provided on the handle and acts on the ratchet through a second torsion spring to prevent the take-up reel from rotating in the opposite direction to the take-up binding tape. The handle is configured to drive the eccentric wheel to rotate in the direction of winding the binding tape under the action of external force, so as to drive the first anti-stop plate to switch from the position acting on the ratchet to the position not acting on the ratchet; the second anti-stop plate is provided with a second pressing part, which is used to control the second anti-stop plate to switch from the position acting on the ratchet to the position not acting on the ratchet.

10. The tensioning machine according to claim 9, characterized in that, The second backstop plate has a limiting protrusion protruding from the bracket, and the side wall of the bracket is provided with a guide groove for limiting the movement range of the limiting protrusion.

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