Tensioning machine

Abstract

The utility model relates to a tensioning machine which comprises a support, a tensioning device and a tensioning device. The belt shaft is rotatably mounted on the bracket, penetrates through the accommodating space and is used for winding and rolling the binding belt; the volute spring is arranged on the belt shaft and used for enabling the belt shaft to have the tendency of rotating in the bundling belt winding direction; the speed reduction assembly is arranged on the belt shaft and used for acting on the belt shaft to reduce the rotating speed of the belt shaft when the belt shaft rotates in the bundling belt winding direction; the blocking assembly is arranged on the support and used for selectively locking or releasing rotation of the belt shaft. According to the tensioning machine, on the premise that the compact structure is guaranteed, the volute spring and the speed reduction assembly are arranged at the two ends of the belt shaft respectively, the overall layout is more reasonable, mutual interference between components is effectively reduced, and the structural complexity is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tensioner, in particular to a tensioner. BACKGROUND

[0002] Most of the tensioners on the market do not have the function of automatically recovering the binding belt. After unloading the goods, the operator has to spend time to arrange the binding belt, which increases the operation burden and working time. For those tensioners with a belt recovery function, the following technical problems often exist: on the one hand, the existing belt recovery device cannot effectively control the recovery speed when recovering the binding belt, which easily leads to too fast recovery of the binding belt, and cannot randomly stop the belt recovery process, causing the metal hook at the front end of the binding belt to suddenly pop back, which has safety hazards and may even cause personal injury; on the other hand, the structure of the existing belt recovery mechanism is often too complex, which is inconvenient to use and increases the operation difficulty and maintenance cost.

[0003] Although some existing solutions attempt to solve the problem of recovering the binding belt by adding a recovery mechanism, they usually only consider the implementation of the belt recovery function, and ignore the layout design of the recovery mechanism itself. The power element and the speed reduction element are directly mixed and arranged, which not only increases the structural complexity, but also affects the overall operation efficiency and safety. CONTENT OF THE INVENTION

[0004] In order to solve the above problems, the present application provides a tensioner with a more reasonable overall layout.

[0005] In order to achieve the above purpose, the tensioner designed by the present application comprises:

[0006] a support having a receiving space for receiving a binding belt;

[0007] a belt shaft rotatably mounted on the support and passing through the receiving space, for winding and rolling the binding belt; a volute spring provided on the belt shaft, for making the belt shaft have a tendency to rotate in the direction of rolling the binding belt;

[0008] a speed reduction assembly provided on the belt shaft, for acting on the belt shaft to reduce the rotation speed of the belt shaft when the belt shaft rotates in the direction of rolling the binding belt;

[0009] a blocking assembly provided on the support, for selectively locking or releasing the rotation of the belt shaft;

[0010] wherein the belt shaft has a first end exposed outside the support and a second end disposed opposite to the first end, the volute spring is arranged at the first end of the belt shaft, and the speed reduction assembly is arranged at the second end of the belt shaft.

[0011] Further, the speed reduction assembly is configured to act on the belt shaft in the form of friction.

[0012] Further, the deceleration assembly comprises 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 circumferential surface of the second end of the belt shaft under the action of the first torsion spring.

[0013] Further, two ears are arranged on the deceleration plate in opposite directions, and the two ears are sleeved on the mounting shaft; the first torsion spring is located between the two ears.

[0014] Further, the second end of the belt shaft is provided with knurls for increasing friction; or, the second end of the belt shaft is sleeved with a gear, and the gear tip of the gear is in contact with the plate surface of the deceleration plate away from the first torsion spring.

[0015] Further, the deceleration plate has a second position not acting on the belt shaft, and an operating handle is arranged on the deceleration plate, and the operating handle is configured to drive the deceleration plate to switch from the first position to the second position.

[0016] Further, a relief hole is formed in the side wall of the bracket, the deceleration plate has a first pressing portion extending to the accommodation space through the relief hole; and the top of the bracket is provided with an operating window exposing the first pressing portion and the accommodation space.

[0017] Further, a protective shell is further included, the protective shell 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 plate surface of the deceleration plate, and the other end abuts against the inner wall of the protective shell.

[0018] Further, the blocking assembly comprises:

[0019] a take-up disc with a ratchet at both ends, which is rotatably installed on the belt shaft;

[0020] a handle with an eccentric wheel, the handle is rotatably installed on the belt shaft through the eccentric wheel;

[0021] a first backstop plate arranged on the bracket and acting on the ratchet through a compression spring, for preventing the take-up disc from rotating in the direction opposite to winding the binding belt;

[0022] a second backstop plate arranged on the handle and acting on the ratchet through a second torsion spring, for preventing the take-up disc from rotating in the direction opposite to winding the binding belt;

[0023] The handle is configured to drive the eccentric wheel to rotate in the direction of winding the binding belt under the action of an external force, so as to drive the first backstop plate to switch from the position of acting on the ratchet wheel to the position of not acting on the ratchet wheel; the second backstop plate is provided with a second pressing part, which is used to control the second backstop plate to switch from the position of acting on the ratchet wheel to the position of not acting on the ratchet wheel.

[0024] Further, the second backstop plate has a limiting protrusion protruding from the bracket, and a guide groove for limiting the movement range of the limiting protrusion is arranged on the side wall of the bracket.

[0025] The tensioning machine designed in the application not only makes the overall layout more reasonable, but also effectively reduces the mutual interference between components and significantly reduces the structural complexity, under the premise of ensuring compact structure, by providing the belt shaft with a rotating driving force in the direction of winding the binding belt through the volute spring, the automatic recycling function of the binding belt is realized, and the tedious operation of manual arrangement is effectively eliminated. At the same time, the speed of the belt shaft is effectively reduced by the friction force of the speed reduction assembly acting on the belt shaft, which avoids the safety hazards caused by the too fast recycling of the woven belt, and improves the reliability and service life of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the tensioning machine provided by the embodiment of the application.

[0027] Figure 2 is a structural schematic diagram of the speed reduction assembly provided by the embodiment of the application.

[0028] Figure 3 is Figure 1 the exploded view of

[0029] Figure 4 is Figure 1 the top view of

[0030] Figure 5 is Figure 4 the sectional view of A-A in

[0031] Wherein: bracket 10, let go hole 11, guide groove 12, belt shaft 20, gear 21, volute spring 30, speed reduction assembly 40, mounting shaft 41, speed reduction plate 42, ear part 421, operating handle 422, first pressing part 423, first torsional spring 43, protective shell 44, blocking assembly 50, ratchet wheel 51, belt winding disc 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 torsional spring 58, operating window 60. DETAILED DESCRIPTION

[0032] 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.

[0033] like Figures 1 to 5 As shown, 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. These components, through structural design and coordinated operation, jointly realize the automatic retraction, speed control, and selective locking functions of the binding strap.

[0034] The support 10 has a receiving space for accommodating the binding straps. In a specific implementation, the support 10 is preferably made of high-strength steel using a stamping process to form a shape such as... Figure 3 The U-shaped structure shown provides a foundation for the installation of other components through its two side panels, ensuring the strength and rigidity of the overall structure while also creating an internal space suitable for accommodating the binding straps, facilitating their orderly storage.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The belt shaft 20 has a first end exposed outside the support 10 and a second end opposite to the first end, the volute spring 30 is arranged at the first end of the belt shaft 20, and the deceleration assembly 40 is arranged at the second end of the belt shaft 20. The structure design of arranging the winding power source (the volute spring 30) and the resistance control mechanism (the deceleration assembly 40) at the two ends of the belt shaft 20 respectively can significantly optimize the overall structure layout: by arranging the component generating the rotation tendency and the component controlling the rotation speed separately, the mutual interference between the two components is effectively avoided, the respective functions can be more purely realized, the overall stability and reliability of the system are improved, meanwhile, the layout is convenient for the installation, maintenance and repair of the components, and the service life of the equipment is prolonged.

[0040] In some embodiments, as shown in Figure 2 , Figure 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 pivoted to the mounting shaft 41 and has a first position; in the first position, the deceleration plate 42 abuts against the outer circumferential 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 winding direction of the binding belt under the driving of the volute spring 30, the deceleration plate 42 in the first position generates a friction force between the second end of the belt shaft 20 under the action of the first torsion spring 43, thereby effectively preventing the rapid rotation of the belt shaft 20, achieving the purpose of reducing the rotation speed, so that the binding belt can be wound slowly, avoiding the safety hazard caused by rapid rebound. In order to improve the friction effect, the contact surface between the deceleration plate 42 and the belt shaft 20 in the embodiment is designed as an arc surface, which 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.

[0041] Specifically, as shown in Figure 2 , Figure 3 The deceleration plate 42 is provided with two oppositely arranged ear parts 421, the two ear parts 421 are sleeved on the mounting shaft 41 at intervals, the two ear parts 421 sleeved on the mounting shaft 41 at intervals can provide more stable and reliable pivoting support, reduce the shaking or tilting of the deceleration plate 42 during swinging, and ensure that the contact between the deceleration plate 42 and the belt shaft 20 is more uniform and stable; the first torsion spring 43 is located between the two ear parts 421, which can make the overall structure of the deceleration assembly 40 more compact and reduce the occupied space.

[0042] In some embodiments, the second end of the belt shaft 20 is provided with knurling to increase friction. Knurling involves pressing fine textures onto the surface of the belt shaft 20, which increases the coefficient of friction of the contact surface, allowing the deceleration assembly 40 to obtain greater frictional resistance when it abuts against the belt shaft 20, thus achieving a more effective deceleration effect. In another specific embodiment, such as Figure 2 , Figure 3 As shown, a gear 21 is fitted onto the second end of the belt shaft 20. The tips of the gear 21 contact the surface of the reduction plate 42 on the side 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, thus reducing maintenance costs.

[0043] In some embodiments, such as Figure 2 , Figure 3 As shown, 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, thereby driving the deceleration plate 42 to switch between a first position in contact with the belt shaft 20 and a second position where it is not in contact with 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.

[0044] In some embodiments, such as Figure 2 , Figure 3As shown, the side wall of the bracket 10 is provided with a clearance hole 11, and the deceleration plate 42 has a first pressing portion 423 extending through the clearance hole 11 to the receiving space; the top of the bracket 10 is provided with an operation window 60 exposing the first pressing portion 423 and the receiving space. With this structure, the operation end of the handle 422, i.e. the first pressing portion 423, can be accommodated in the receiving space of the bracket 10, and the operator can still conveniently press the first pressing portion 423 through the operation window 60 provided on the top of the bracket 10, effectively avoiding the direct influence of external environmental factors (such as accidental extrusion or collision during bundling or transportation) on the first pressing portion 423, significantly improving the reliability and durability of the deceleration control mechanism, and reducing the risk of deceleration failure caused by accidental touch or external force.

[0045] In some embodiments, as shown in Figure 2 , Figure 3 As shown, the bracket 10 is provided with a protective shell 44 covering 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 can effectively cover the key components of the deceleration assembly 40 (such as the mounting shaft 41, the deceleration plate 42, and the first torsion spring 43), preventing external dust, debris, and moisture from entering the interior of the deceleration assembly, avoiding deceleration failure or performance degradation caused by foreign matter interference, and significantly improving the reliability and durability of the deceleration assembly. In another example, similar to the deceleration assembly, the side where the volute spring 30 is located is also provided with a volute shell accommodating the volute spring 30 to provide protection for the volute spring 30.

[0046] In some embodiments, as shown in Figures 1 to 5 The blocking assembly 50 includes:

[0047] The take-up disc 52 with the ratchet 51 at both ends is rotatably mounted on the belt shaft 20;

[0048] The handle 54 with the eccentric wheel 53 is rotatably mounted on the belt shaft 20 through the eccentric wheel 53;

[0049] The first backstop plate 55 is provided on the bracket 10 and acts on the ratchet 51 through a compression spring 56 to prevent the take-up disc 52 from rotating in the direction opposite to winding the bundling belt;

[0050] The second backstop 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 disc 52 from rotating in the direction opposite to winding the bundling belt;

[0051] The handle 54 is configured to drive the eccentric wheel 53 to rotate in the direction of winding the binding belt under the action of external force, so as to drive the first backstop plate 55 to switch from the position of acting on the ratchet wheel 51 to the position of not acting on the ratchet wheel 51; the second backstop plate 57 is provided with a second pressing part 571, which is used to control the second backstop plate 57 to switch from the position of acting on the ratchet wheel 51 to the position of not acting on the ratchet wheel 51.

[0052] In actual work process, referring to Figure 5 ,

[0053] When working normally, the rear end of the support 10 and the winding binding belt on the belt winding disc 52 are hung at target positions through hooks on the front and rear sides of the support 10, at this time, the first backstop plate 55 is engaged with the ratchet teeth of the ratchet wheel 51 under the action of the compression spring 56, and the second backstop plate 57 is engaged with the ratchet teeth of the ratchet wheel 51 under the action of the second torsional spring 58, thereby preventing the belt winding disc 52 from rotating in the direction opposite to winding the binding belt (clockwise), and ensuring that the goods will not be displaced due to loosening of the binding belt during transportation.

[0054] When it is necessary to further tighten the bound goods, the handle 54 is rotated, so that the eccentric wheel 53 rotates in the direction opposite to winding the binding belt (counterclockwise), the rotation of the eccentric wheel 53 pushes the first backstop plate 55 to compress the compression spring 56 until the first backstop plate 55 is disengaged from the ratchet teeth of the ratchet wheel 51, and at the same time, the second backstop plate 57 provided on the rotating handle 54 remains in the state of engaging with the ratchet wheel 51 to drive the ratchet wheel 51 and the belt winding disc 52 to rotate counterclockwise, so as to realize the contraction of the binding belt. By repeatedly rotating the handle 54, the binding belt can be gradually tightened until the firm binding of the goods is completed.

[0055] When it is necessary to loosen the goods, the second pressing part 571 is pressed to switch the second backstop plate 57 from the position of acting on the ratchet wheel 51 to the position of not acting on the ratchet wheel 51, that is, the second backstop plate 57 is disengaged from the ratchet teeth of the ratchet wheel 51, at this time, the handle 54 is rotated, so that the eccentric wheel 53 rotates counterclockwise to push the first backstop plate 55 to compress the compression spring 56 until the first backstop plate 55 is disengaged from the ratchet teeth of the ratchet wheel 51, at this time, the ratchet wheel 51 and the belt winding disc 52 can rotate clockwise or counterclockwise without limitation, and the operator can directly move the support 10 to pull the binding belt to the desired length, so as to conveniently realize the loosening of the goods.

[0056] In some embodiments, as Figure 2 , Figure 3As shown, the second backstop plate 57 has a limiting protrusion 572 protruding from the bracket 10, and the sidewall of the bracket 10 is provided with a guide groove 12 for limiting the movement range of the limiting protrusion 572. Through the limitation of the guide groove 12, the rotation angle of the second backstop plate 57, that is, the handle 54, is limited within the expected range, avoiding damage caused by excessive rotation.

[0057] The tensioning machine provided by the embodiment ensures compact structure, and separates the volute spring and the speed reduction assembly at two ends of the belt shaft, so that the overall layout is more reasonable, the mutual interference between components is effectively reduced, and the structural complexity is significantly reduced. Specifically, the volute spring provides a rotation driving force to the belt shaft in the direction of winding the binding belt, so that the automatic recycling function of the binding belt is realized, and the cumbersome operation of manual arrangement is effectively eliminated. Meanwhile, the speed reduction assembly acts on the belt shaft in a frictional manner, so that the rotation speed of the belt shaft is effectively reduced, the safety hazard caused by too fast recycling of the braid is avoided, and the reliability and service life of the equipment are improved.

[0058] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "vertical", "upper", "lower", "horizontal" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0059] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements inside. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0060] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, and those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A tensioner characterized by, The application relates to a device for winding a binding belt, comprising: a support having a receiving space for receiving the binding belt; a belt shaft rotatably mounted on the support and penetrating the receiving space for winding and rolling the binding belt; a volute spring arranged on the belt shaft for making the belt shaft have a tendency to rotate in the direction of rolling the binding belt; a deceleration assembly arranged on the belt shaft for acting on the belt shaft to reduce the rotating speed of the belt shaft when the belt shaft rotates in the direction of rolling the binding belt; a blocking assembly arranged on the support for selectively locking or releasing the rotation of the belt shaft; wherein the belt shaft has a first end exposed outside the support and a second end arranged opposite to the first end, the volute spring is arranged on the first end of the belt shaft, and the deceleration assembly is arranged on the second end of the belt shaft.

2. The tensioner of claim 1, wherein The deceleration assembly is configured to act on the belt shaft in the form of friction.

3. The tensioner of claim 1, wherein, The deceleration assembly comprises 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 is abutted against the outer circumferential surface of the second end of the belt shaft under the action of the first torsion spring.

4. The tensioner of claim 3, wherein, Two opposite ears are arranged on the deceleration plate, and the two ears are sleeved on the mounting shaft; the first torsion spring is located between the two ears.

5. The tensioner of claim 4, wherein, The second end of the belt shaft is provided with knurls for increasing friction; or the second end of the belt shaft is sleeved with a gear, and the gear tooth tip is in contact with the plate surface on the side of the deceleration plate away from the first torsion spring.

6. The tensioner of claim 4, wherein, The deceleration plate has a second position not acting on the belt shaft, and an operating handle is arranged on the deceleration plate, and the operating handle is configured to drive the deceleration plate to switch from the first position to the second position.

7. The tensioner of claim 6, wherein, A relief hole is formed in the side wall of the support, the deceleration plate has a first pressing part extending to the receiving space through the relief hole, and the top of the support is provided with an operating window exposing the first pressing part and the receiving space.

8. The tensioner of claim 3, wherein, A protective shell is further arranged, the protective shell is fixedly mounted on the side wall of the support and covers the deceleration assembly, one end of the first torsion spring abuts against the upper plate surface of the deceleration plate, and the other end abuts against the inner wall of the protective shell.

9. The tensioner of any one of claims 1-8, wherein, The blocking assembly comprises: a belt receiving disc rotatably mounted on the belt shaft and provided with a ratchet at both ends; a handle provided with an eccentric wheel, the handle is rotatably mounted on the belt shaft through the eccentric wheel; a first backstop plate arranged on the support and acting on the ratchet through a compression spring for preventing the belt receiving disc from rotating in the direction opposite to the direction of rolling the binding belt; a second backstop plate arranged on the handle and acting on the ratchet through a second torsion spring for preventing the belt receiving disc from rotating in the direction opposite to the direction of rolling the binding belt. The handle is configured to drive the eccentric wheel to rotate in the direction of winding the binding belt under the action of external force, so as to drive the first backstop plate to switch from the position of acting on the ratchet to the position of not acting on the ratchet; the second backstop plate is provided with a second pressing part, which is used to control the second backstop plate to switch from the position of acting on the ratchet to the position of not acting on the ratchet.

10. The tensioner of claim 9, wherein, 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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