A tensioner capable of automatically tightening and releasing a belt

Abstract

The present invention discloses a tensioner capable of automatically tightening and releasing a belt, which is applied in the technical field of tensioners. The key points of the technical solution are as follows: the tightening and releasing belt assembly comprises a mounting seat coaxially fixedly connected to two ends of the belt shaft, and an adjusting seat coaxially arranged is fixedly provided on the handle; a rotating plate is rotatably connected to the center position of the adjusting seat, an adjusting assembly is provided at one end of the rotating plate away from the bracket, a tightening assembly is coaxially arranged between the adjusting seat and the mounting seat, one end of the tightening assembly is fixedly connected to the rotating plate, and the other end cooperates with the mounting seat to drive the ratchet to realize unidirectional rotation, and a belt releasing torsion spring is sleeved and connected on the mounting seat; the technical effect is that the goods can be automatically tightened when they are loose, and the belt can be automatically released, and the operation is simpler.

Description

Technical Field

[0001] The invention relates to the technical field of tensioners, and in particular to a tensioner capable of automatically tightening and releasing a belt. Background Art

[0002] In daily transportation life, it is often necessary to tie up various goods, especially when large trucks or trailers are used to transport goods. Since the goods are of different sizes and weights, the loaders need to tie up and fix the goods after loading. Generally, the goods are tied up by straps. The existing cargo binding method is mainly done by manpower. Since the tightening of the straps is time-consuming and labor-intensive, people have designed a ratchet-type strap tensioner, which drives the straps to bind the goods through the unidirectional rotation of the ratchet. The tensioner is equivalent to the fulcrum of the lever. Therefore, the loaders can simply and effectively tie up and tighten the goods through the conventional tensioner.

[0003] When the strap is in use, the two ratchets are driven by the handle to rotate relative to the bracket, thereby driving the strap to rotate and wind the strap to tighten the strap to achieve cargo bundling. During cargo transportation, the fast transportation speed, bumps caused by uneven road surface, etc. can easily cause the cargo to loosen during the bumpy transportation, resulting in insufficient tightening of the strap, which makes the cargo prone to tilting or even falling during bumpy transportation, posing a certain road safety hazard. On the other hand, when it is necessary to unload and disassemble the tensioning strap, the worker needs to open the tensioner and pull the handle with one hand to unlock the ratchet, at which time the strap can rotate freely, and then the worker pulls the strap with the other hand to drive the strap to rotate so that the strap wound on the strap is loosened, and finally the worker pulls the middle position of the strap to make the strap joint pass out from between the two half-axes. The operation is relatively cumbersome and there is room for improvement. Summary of the invention

[0004] The purpose of the present invention is to provide a tensioner capable of automatically tightening and releasing the belt, which has the advantages of being able to automatically tighten when the goods become loose and automatically release the belt, making the operation easier.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical scheme: a tensioner capable of automatically tightening and releasing a belt, comprising a bracket, a handle and a handle, the bracket being rotatably connected to a belt shaft, the belt shaft being wound on the belt shaft, the belt shaft being composed of a group of symmetrically arranged semi-moon shafts, the belt shaft being symmetrically sleeved and connected to a ratchet, and two ends of the belt shaft being symmetrically provided with a tightening and releasing belt assembly; the tightening and releasing belt assembly comprises a mounting seat coaxially fixedly connected to two ends of the belt shaft, and at the same time, an adjusting seat coaxially arranged with the mounting seat is fixedly provided on the handle, the adjusting seat is rotatably connected to a rotating plate at the center position of the adjusting seat, an adjusting assembly for adjusting the positional relationship between the rotating plate and the adjusting seat is provided at one end of the rotating plate away from the bracket, a tightening assembly is coaxially provided between the adjusting seat and the mounting seat, one end of the tightening assembly is fixedly connected to the rotating plate, and the other end cooperates with the mounting seat to drive the ratchet to achieve unidirectional rotation, and a belt releasing torsion spring is sleeved and connected on the mounting seat.

[0006] The present invention is further configured as follows: the tightening includes a tightening plate coaxially arranged with the mounting seat, the tightening plate is provided with a plurality of arc-shaped sliding grooves evenly spaced along the circumferential direction, a first sliding column and a second sliding column are respectively slidably connected in the arc-shaped sliding grooves, a tightening spring is fixedly arranged between the first sliding column and the second sliding column, the first sliding column protrudes from the end face of the tightening plate and is fixedly installed on the rotating plate, the second sliding column protrudes from the tightening plate and is inserted into the mounting seat, and an arc-shaped accommodating groove for accommodating the second sliding column is provided in the mounting seat.

[0007] The present invention is further configured as follows: the ratchet wheel is provided with n ratchet teeth, the central angle of a single ratchet tooth is 360° / n, the arc center angle α of the arc-shaped sliding groove is not less than twice the middle angle of a single ratchet tooth, the number m of the arc-shaped sliding grooves is not less than 2, and the product of the number m of the arc-shaped sliding grooves multiplied by the arc center angle α of the arc-shaped sliding groove is between 270°-330°.

[0008] The present invention is further configured as follows: the adjustment component includes a plurality of adjustment slots evenly and fixedly arranged along the circumferential direction at one end of the adjustment seat away from the bracket, the number of the adjustment slots is equal to the number of ratchet teeth of the ratchet wheel, a sliding seat is fixedly connected to the center position of the rotating plate, an adjustment rod for inserting into the adjustment slot is slidably connected to the sliding seat along the diameter direction of the rotating plate, an abutment spring is fixedly arranged in the sliding seat, a clamping hole is opened on the adjustment rod near the sliding seat, and a hook is provided on the sliding seat for hooking the clamping hole to prevent the adjustment rod from being inserted into the adjustment slot.

[0009] The present invention is further configured as follows: a knob for driving the slide seat to rotate is fixedly provided at one end of the adjusting lever away from the bracket, and an anti-slip portion is provided on the knob along the circumferential direction.

[0010] The present invention is further configured as follows: the handle is slidably connected to the handle, a sliding groove is provided on the handle for the handle to slide, one end of the handle abuts against the ratchet so that the ratchet can only rotate in one direction, and a return spring is fixed in the sliding groove.

[0011] The present invention is further configured as follows: one end of the belt release torsion spring is fixedly mounted on the outer shaft wall of the mounting seat, and the other end is fixedly mounted on the inner shaft wall of the adjustment seat, a strap guide block is fixedly provided on the bracket, and a counterweight block for driving the end of the strap to slide off the belt shaft by itself can also be adjusted and fixed on the strap.

[0012] The present invention is further configured as follows: the strap guide block includes a U-shaped guide hole fixedly arranged on the bracket close to one end of the ratchet, a cover body is rotatably connected to the opening of the U-shaped guide hole, and a partition is fixedly provided at the middle position of the U-shaped guide hole along the height direction, and the partition divides the U-shaped guide hole into two guide grooves.

[0013] The present invention is further configured as follows: a first magnet is fixedly provided on the counterweight block, the first magnet fits the outer end surface of the strap, and a second magnet is also provided to cooperate with the first magnet. The first magnet and the second magnet are respectively clamped at both ends of the strap to achieve fixed installation of the counterweight block on the strap.

[0014] The present invention is further configured as follows: a grip and a pulling sleeve are fixedly provided at one end of the handle and the handle away from the ratchet respectively, and the grip and the pulling sleeve are made of hard rubber material.

[0015] In summary, the present invention has the following beneficial effects:

[0016] 1. When winding the belt, the adjusting component is set so that the rotating plate can rotate freely. When the handle is turned to drive the ratchet to rotate in one direction, the tightening spring will not be compressed. When the belt is wound, the rotating plate is driven to rotate along the rotation direction of the ratchet so that the second sliding column 754 abuts against the starting end of the arc-shaped receiving groove provided in the mounting seat along the rotation direction of the ratchet. At this time, the adjusting slot corresponding to the adjusting card rod is the initial adjusting slot. The rotating plate is continued to be driven to rotate along the rotation direction of the ratchet so that the first sliding column presses the tightening spring to compress it to a certain extent. At this time, the adjusting slot corresponding to the adjusting card rod is the terminal adjusting slot The degree of compression of the tightening spring is the central angle between the initial adjustment slot and the terminal adjustment slot. When the tightening spring is compressed, the rotating plate cannot rotate, so the tightening spring can only drive the second sliding column to abut against the mounting seat, thereby driving the ratchet wheel to rotate and then driving the belt shaft to rotate. When the strap is in a tightened state, it will prevent the belt shaft from rotating. When the strap is loose during transportation, the tightening spring drives the mounting seat to rotate, thereby driving the ratchet wheel to rotate, thereby tightening the strap. The structure is simple, and the compression degree of the tightening spring can be adjusted by adjusting the cooperation between the clamping connection and the adjusting slot, thereby adjusting the tightening degree.

[0017] 2. A belt release torsion spring is set between the mounting seat and the adjusting seat. When the handle is turned to retract the belt, the torsion spring is twisted. When the belt needs to be released, it is only necessary to pull the handle to make the ratchet lose the engagement. The belt release torsion spring drives the mounting seat to rotate and then drives the belt shaft to rotate, thereby realizing automatic belt release. At the same time, a belt guide block and a counterweight block are set. The belt guide block divides the U-shaped guide hole into two guide grooves by setting a partition, thereby separating the joint of the belt, preventing the belt joint from being entangled on the belt and affecting normal belt release. At the same time, it can also guide the belt to prevent the winding of the belt from affecting the tightening effect. The position of the counterweight block is adjustable, so it is convenient to adjust the position of the counterweight block under different conditions, thereby facilitating smooth belt release. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of this embodiment;

[0019] Figure 2 yes Figure 1 A magnified schematic diagram of part A;

[0020] Figure 3 is a structural cross-sectional view of the strap guide block of this embodiment;

[0021] Figure 4 is a schematic diagram of the exploded structure of the belt tightening and unwinding assembly of this embodiment;

[0022] Figure 5 yes Figure 4 A magnified schematic diagram of part B;

[0023] Figure 6 is a structural cross-sectional view of the belt tightening and unwinding assembly of this embodiment;

[0024] Figure 7 Schematic diagram of the structure of the tightening assembly of this embodiment.

[0025] Reference numerals: 1, bracket; 2, handle; 21, grip; 22, slide; 23, return spring; 3, handle; 31, pull sleeve; 4, belt shaft; 5, strap; 6, ratchet; 61, ratchet; 7, belt tightening and releasing assembly; 71, mounting seat; 72, adjustment seat; 73, rotating plate; 74, adjustment assembly; 741, adjustment slot; 742, slide; 743, adjustment lever; 744, abutment spring; 745, clamping hole; 74 6. Hook; 747. Knob; 748. Anti-slip part; 75. Tightening assembly; 751. Tightening plate; 752. Arc-shaped sliding groove; 753. First sliding column; 754. Second sliding column; 755. Tightening spring; 756. Arc-shaped receiving groove; 76. Release belt torsion spring; 8. Strap guide block; 81. U-shaped guide hole; 82. Cover body; 83. Partition plate; 84. Guide groove; 9. Counterweight block; 91. First magnet; 92. Second magnet. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0027] Example:

[0028] refer to Figure 1 A tensioner capable of automatically tightening and releasing a belt comprises a bracket 1, a handle 2 and a handle 3. A belt shaft 4 is rotatably connected to the bracket 1. The handle 2 is rotatably connected to the bracket 1 with the central axis of the belt shaft 4 as the rotation center. The handle 3 is slidably connected to the handle 2. A slide groove 22 for the handle 3 to slide is provided on the handle 2. One end of the handle 2 abuts against a ratchet 6 so that the ratchet 6 can only rotate in one direction. A return spring 23 is fixed in the slide groove 22. A binding rod 23 is wound on the belt shaft 4. The belt 5 and the belt shaft 4 are composed of a group of symmetrically arranged half-moon shafts, and a ratchet 6 is symmetrically sleeved and connected to the belt shaft 4. One end of the handle 3 is provided with a clamping portion for clamping the ratchet 6 so that the ratchet 6 can only rotate in one direction. The tightening and releasing belt components 7 are symmetrically arranged at both ends of the belt shaft 4. The tightening and releasing belt components 7 can automatically drive the ratchet 6 to rotate when the strap 5 is loose, thereby driving the belt shaft 4 to rotate so that the strap 5 is tightened again. At the same time, the belt can be automatically loosened with only a simple operation when loosening the belt.

[0029] refer to Figures 4 to 6Specifically, the belt tightening and unwinding assembly 7 includes a mounting seat 71 coaxially fixedly connected to both ends of the belt shaft 4, and a mounting hole for accommodating the installation of two semi-moon shafts is opened in the mounting seat 71. At the same time, an adjusting seat 72 coaxially arranged with the mounting seat 71 is fixedly provided on the handle 2, and a rotating plate 73 is coaxially rotatably connected to the center position of the adjusting seat 72. An adjusting assembly 74 for adjusting the positional relationship between the rotating plate 73 and the adjusting seat 72 is provided at the end of the rotating plate 73 away from the bracket 1. A tightening assembly 75 is coaxially provided between the adjusting seat 72 and the mounting seat 71, and one end of the tightening assembly 75 It is fixedly connected to the rotating plate 73, and the other end cooperates with the mounting seat 71 to drive the ratchet 6 to achieve unidirectional rotation. At the same time, a belt-releasing torsion spring 76 is sleeved and connected to the mounting seat 71. One end of the belt-releasing torsion spring 76 is fixedly mounted on the outer shaft wall of the mounting seat 71, and the other end is fixedly mounted on the inner shaft wall of the adjusting seat 72. Therefore, when the handle 2 is turned to wind the belt, the belt-releasing torsion spring 76 is twisted to store energy. When it is necessary to release the belt, it is only necessary to pull the handle 3 to make the ratchet 6 lose the clamping connection. The belt-releasing torsion spring 76 drives the mounting seat 71 to rotate and then drives the belt shaft 4 to rotate, thereby realizing automatic belt release.

[0030] refer to Figures 4 to 6 Specifically, the tightening assembly 75 includes a tightening plate 751 that is coaxially arranged with the mounting seat 71, and a plurality of arc-shaped sliding grooves 752 are evenly spaced along the circumferential direction on the tightening plate 751, and a first sliding column 753 and a second sliding column 754 are respectively slidably connected in the arc-shaped sliding grooves 752, and a tightening spring 755 is fixedly arranged between the first sliding column 753 and the second sliding column 754, and the first sliding column 753 protrudes from the end face of the tightening plate 751 and is fixedly installed on the rotating plate 73, and the second sliding column 754 protrudes from the tightening plate 751 and is inserted into the mounting seat 71, and an arc-shaped accommodating groove 756 for accommodating the second sliding column 754 is opened in the mounting seat 71.

[0031] refer to Figures 4 to 7The adjusting member 74 includes a plurality of adjusting slots 741 which are evenly and fixedly arranged along the circumferential direction at one end of the adjusting seat 72 away from the bracket 1. The number of the adjusting slots 741 is equal to and corresponds to the number of the ratchet teeth 61 of the ratchet wheel 6. A sliding seat 742 is fixedly connected to the center position of the rotating plate 73. An adjusting rod 743 for inserting into the adjusting slot 741 is slidably connected in the sliding seat 742 along the diameter direction of the rotating plate 73. At the same time, an abutting spring 744 for abutting against the adjusting rod 743 is fixedly arranged in the sliding seat 742. When the adjusting rod 743 is inserted into the adjusting slot 741, the abutting spring 744 abuts against the adjusting rod 743 to prevent the adjusting rod 743 from slipping during movement. 3 slips out of the adjusting slot 741, causing the rotating plate 73 to rotate freely and affecting normal tightening. A clamping hole 745 is opened on the adjusting clamping rod 743 near the sliding seat 742, and a clamping hook 746 is provided on the sliding seat 742 to hook the clamping hole 745 to prevent the adjusting clamping rod 743 from being inserted into the adjusting slot 741. When winding the belt, the clamping hook 746 is used to hook the clamping hole 745. At the same time, a knob 747 for driving the sliding seat 742 to rotate is fixedly provided at one end of the adjusting clamping rod 743 away from the bracket 1. An anti-slip portion 748 is provided on the knob 747 along the circumferential direction. When driving the adjusting clamping rod 743 to rotate, it is only necessary to pull the knob 747 to drive the adjusting clamping rod 743 to rotate.

[0032] refer to Figures 4 to 7The cam 752 is in the state of being rotated with the cam 740 moving in the direction of rotation of the first lever 744, so that the cam 752 can be tightened and tightened when the cam 740 is in the state of being rotated. When the locking cam 755 is in the state of being tightened, the locking cam 754 can be tightened to the locking cam 756, so that the locking cam 756 can be tightened to the locking cam 756.

[0033] Specifically, assuming that the ratchet 6 is provided with n ratchet teeth 61, the central angle of a single ratchet tooth 61 is 360° / n. In order to ensure that the ratchet 6 can be smoothly pushed to rotate and thus achieve the function of tightening the strap 5, the arc center angle α of the arc-shaped sliding groove 752 is not less than twice the middle angle of a single ratchet tooth 61, the number m of the arc-shaped sliding grooves 752 is not less than 2, and the product of the number m of the arc-shaped sliding grooves 752 multiplied by the arc center angle α of the arc-shaped sliding grooves 752 is between 270°-330°. In this embodiment, the number m of the arc-shaped sliding grooves 752 is 3, and the ratchet 6 is provided with 11 ratchet teeth 61. The arc center angle α of a single arc-shaped sliding groove 752 is 3 times the middle angle of the ratchet tooth 61. The product of the number m of the arc-shaped sliding grooves 752 and the arc center angle α of the arc-shaped sliding groove 752 is approximately equal to 294°. At this time, the tightening plate 751 can have sufficient structural strength to support the tightening spring 755 to drive the second sliding column 754 to abut against the groove wall of the arc-shaped accommodating groove 756 to indirectly drive the ratchet 6 to rotate, and at the same time, the tightening spring 755 also has sufficient elastic force to push the mounting seat 71 to rotate.

[0034] refer to Figure 1 Specifically, a grip 21 and a pulling sleeve 31 are fixedly provided at the end of the handle 2 and the handle 3 away from the ratchet 6, respectively. The grip 21 and the pulling sleeve 31 are made of hard rubber material, which can facilitate workers to grasp and avoid the problem of workers not being able to grasp the handle 2 or the handle 3 due to sweating in the palms during use, avoid slipping, and improve the user experience.

[0035] refer to Figures 1 to 3 Specifically, a strap guide block 8 is fixedly provided on the bracket 1, and a counterweight block 9 for driving the end of the strap 5 to slide off the belt shaft 4 by itself can be adjusted and fixed on the strap 5. Specifically, the strap guide block 8 includes a U-shaped guide hole 81 fixedly provided at one end of the bracket 1 close to the ratchet 6, and a cover body 82 is rotatably connected at the opening of the U-shaped guide hole 81. A partition plate 83 is fixedly provided at the middle position of the U-shaped guide hole 81 along the height direction. The partition plate 83 divides the U-shaped guide hole 81 into two guide grooves 84. When the strap 5 is inserted between the two semi-moon shafts, the strap 5 is first passed through the guide groove 84 at the bottom, then inserted into the belt shaft 4, and finally the guide groove 84 at the top of the joint of the strap 5 is inserted. It passes through the groove 84 and then covers the cover body 82. This prevents the joint of the strap 5 from being entangled on the strap 5 and affecting the normal release of the strap. At the same time, it can also play a guiding role on the strap 5 to prevent the strap 5 from being wound and affecting the tightening effect. At the same time, a first magnet 91 is fixedly provided on the counterweight block 9. The first magnet 91 fits the outer end surface of the strap 5. At the same time, a second magnet 92 that cooperates with the first magnet 91 is also provided. The first magnet 91 and the second magnet 92 are respectively clamped at both ends of the strap 5 to achieve the fixed installation of the counterweight block 9 on the strap 5. When the position of the counterweight block 9 cannot smoothly drive the strap 5 to fall off the belt shaft 4, the smooth release of the strap can be facilitated by changing the position of the counterweight block 9.

[0036] The use process is briefly described as follows: first, when winding the belt, use the hook 746 to hook the clamping hole 745 set on the adjusting clamp rod 743, so that the rotating plate 73 can rotate freely on the adjusting seat 72, and then when the handle 2 is turned to drive the ratchet 6 to rotate in one direction, the ratchet 6 drives the belt shaft 4 to rotate in the same direction, so as to realize winding the strap 5 around the belt shaft 4, and at the same time drives the mounting seat 71 to rotate in the same direction, at this time, the tightening spring 755 will not be compressed, and at the same time, the belt releasing torsion spring 76 is compressed to store energy. When the belt is wound, the rotating plate 73 is driven to rotate in the rotation direction of the ratchet 6 until the second sliding post 754 abuts against the arc-shaped receiving groove 756 opened in the mounting seat 71 along the ratchet 6. When the cam 755 is in a state of tension, the first spring 753 is engaged with the first lever 71 and the second lever 754 is engaged with the first lever 71. When the cam 755 is engaged, the first lever 71 is engaged with the second lever 754 and the second lever 754 is engaged with the first lever 71. When the cam 755 is in a state of tension, the first lever 71 is engaged with the second lever 754 and the second lever 754 is engaged with the first lever 71.

[0037] When automatic tape unwinding is required, first use the hook 746 to hook the engaging hole 745 set on the adjusting lever 743 so that the rotating plate 73 can rotate freely on the adjusting seat 72, and then pull the handle 3 so that the ratchet 6 is no longer engaged. At this time, the tape unwinding torsion spring 76 drives the mounting seat 71 to rotate, and then drives the belt shaft 4 to rotate in the opposite direction of the tape rewinding. At this time, the strap 5 is detached from the belt shaft 4, and the counterweight block 9 pulls the strap 5 to detach from the belt shaft 4 to achieve automatic tape unwinding.

[0038] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make creative modifications to this embodiment as needed, but as long as it is within the scope of the claims of the present invention, it will be protected by the patent law.

Claims

1. A tensioner capable of automatically tightening and releasing a belt, comprising a bracket (1), a handle (2) and a handle (3), wherein the bracket (1) is rotatably connected to a belt shaft (4), a strap (5) is wound on the belt shaft (4), the belt shaft (4) is composed of a group of symmetrically arranged half-moon shafts, a ratchet (6) is symmetrically sleeved and connected to the belt shaft (4), and tightening and releasing belt components (7) are symmetrically arranged at both ends of the belt shaft (4); characterized in that: The belt tensioning and releasing assembly (7) comprises a mounting seat (71) coaxially fixedly connected to the two ends of the belt shaft (4); at the same time, an adjusting seat (72) coaxially arranged with the mounting seat (71) is fixedly provided on the handle (2); a rotating plate (73) is rotatably connected to the center position of the adjusting seat (72); an adjusting assembly (74) for adjusting the positional relationship between the rotating plate (73) and the adjusting seat (72) is provided at one end of the rotating plate (73) away from the bracket (1); a tightening assembly (75) is coaxially provided between the adjusting seat (72) and the mounting seat (71); one end of the tightening assembly (75) is fixedly connected to the rotating plate (73), and the other end cooperates with the mounting seat (71) to drive the ratchet (6) to realize unidirectional rotation; a belt releasing torsion spring (76) is sleeved and connected to the mounting seat (71); The tightening assembly (75) comprises a tightening plate (751) coaxially arranged with the mounting seat (71); a plurality of arc-shaped sliding grooves (752) are evenly spaced along the circumferential direction on the tightening plate (751); a first sliding column (753) and a second sliding column (754) are slidably connected in the arc-shaped sliding grooves (752); a tightening spring (755) is fixedly arranged between the first sliding column (753) and the second sliding column (754); the first sliding column (753) protrudes from the end surface of the tightening plate (751) and is fixedly installed on the rotating plate (73); the second sliding column (754) protrudes from the tightening plate (751) and is inserted into the mounting seat (71); and an arc-shaped accommodating groove (756) for accommodating the second sliding column (754) is arranged in the mounting seat (71); The ratchet wheel (6) is provided with n ratchet teeth (61), the central angle of a single ratchet tooth (61) is 360° / n, the arc center angle α of the arc-shaped sliding groove (752) is not less than twice the middle angle of a single ratchet tooth (61), the number m of the arc-shaped sliding grooves (752) is not less than 2, and the product of the number m of the arc-shaped sliding grooves (752) and the arc center angle α of the arc-shaped sliding grooves (752) is between 270° and 330°; The adjustment assembly (74) comprises a plurality of adjustment slots (741) uniformly and fixedly arranged along the circumferential direction at one end of the adjustment seat (72) away from the bracket (1), the number of the adjustment slots (741) being equal to the number of the ratchet teeth (61) of the ratchet wheel (6), a sliding seat (742) being fixedly connected at the center position of the rotating plate (73), an adjustment rod (743) for inserting into the adjustment slot (741) being slidably connected in the sliding seat (742) along the diameter direction of the rotating plate (73), an abutment spring (744) being fixedly arranged in the sliding seat (742), a clamping hole (745) being provided on the adjustment rod (743) at a position close to the sliding seat (742), and a clamping hook (746) being provided on the sliding seat (742) for hooking the clamping hole (745) to prevent the adjustment rod (743) from being inserted into the adjustment slot (741).

2. A tensioner capable of automatically tightening and releasing a belt according to claim 1, characterized in that: A knob (747) for driving the sliding seat (742) to rotate is fixedly provided at one end of the adjusting lever (743) away from the bracket (1), and an anti-slip portion (748) is provided on the knob (747) along the circumferential direction.

3. A tensioner capable of automatically tightening and releasing a belt according to claim 1, characterized in that: The handle (3) is slidably connected to the handle (2), and a sliding groove (22) is provided on the handle (2) for the handle (3) to slide. One end of the handle (2) abuts against the ratchet (6) so that the ratchet (6) can only rotate in one direction. A return spring (23) is fixed in the sliding groove (22).

4. A tensioner capable of automatically tightening and releasing a belt according to claim 1, characterized in that: One end of the belt release torsion spring (76) is fixedly mounted on the outer shaft wall of the mounting seat (71), and the other end is fixedly mounted on the inner shaft wall of the adjustment seat (72). A belt guide block (8) is fixedly mounted on the bracket (1), and a counterweight block (9) for driving the end of the belt (5) to slide off the belt shaft (4) can also be adjusted and fixedly mounted on the belt (5).

5. A tensioner capable of automatically tightening and releasing a belt according to claim 4, characterized in that: The strap guide block (8) comprises a U-shaped guide hole (81) fixedly arranged at one end of the bracket (1) close to the ratchet (6); a cover body (82) is rotatably connected to the opening of the U-shaped guide hole (81); a partition plate (83) is fixedly arranged at the middle position of the U-shaped guide hole (81) along the height direction; the partition plate (83) divides the U-shaped guide hole (81) into two guide grooves (84).

6. A tensioner capable of automatically tightening and releasing a belt according to claim 4, characterized in that: A first magnet (91) is fixedly provided on the counterweight (9), and the first magnet (91) fits the outer end surface of the strap (5). A second magnet (92) is also provided to cooperate with the first magnet (91). The first magnet (91) and the second magnet (92) are respectively clamped at two ends of the strap (5) so that the counterweight (9) is fixedly installed on the strap (5).

7. A tensioner capable of automatically tightening and releasing a belt according to claim 1, characterized in that: A grip (21) and a pulling sleeve (31) are fixedly provided at one end of the handle (2) and the pull handle (3) away from the ratchet (6), respectively. The grip (21) and the pulling sleeve (31) are made of hard rubber material.

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