A kind of automobile tensioner with restraint belt anti-breaking gathering structure

Abstract

The application relates to the technical field of tensioners, in particular to an automobile tensioner provided with a short binding belt anti-breaking and collecting structure, which comprises a body, a positioning block is arranged in the middle part of the body, a bolt rod is detachably connected to the top of the body, a short binding belt is arranged on the outside of the bolt rod, a lubricating assembly is arranged on the top of the body, the lubricating assembly comprises an oil cavity which is arranged in the bolt rod, an oil filling pipe is fixedly inserted into the right top of the oil cavity, a sealing cover is fixedly connected to the top of the oil filling pipe, a first piston is movably connected into the oil cavity, a first spring is fixedly connected between the first piston and the inside of the bolt rod, through cooperation of the above structure, lubricating oil supply is realized every time when binding, lubrication is provided between the rotating sleeve and the bolt rod, the short binding belt abrasion can be further reduced, the breaking damage can be reduced, and the service life of the device is improved.

Description

Technical Field

[0001] This invention relates to the field of tensioner technology, specifically to an automotive tensioner with a restraint strap anti-breakage and retraction structure. Background Technology

[0002] Car tensioners are auxiliary tools used to secure goods during transportation, movement, loading, or warehousing, and are widely used in logistics, truck transport bundling, and other fields. Webbing tensioners are typically used with two straps, one long and one short. One end of the shorter strap is fitted onto the fixing rod at the short support end of the tensioner, and the other end is connected to a hook for attaching to one side of the goods. The longer strap passes through the positioning block of the tensioner, and its length is adjusted via a ratchet mechanism to secure the goods.

[0003] During the actual operation of the tensioner, the continuous vibration generated by the vehicle's movement will cause the cargo to sway slightly, which in turn will cause the short restraint strap to rotate repeatedly around the fixed rod. The short restraint strap and the fixed rod are in this state of micro-friction for a long time, which can easily lead to wear, fuzzing, or even breakage of the inner fibers of the restraint strap. This not only requires frequent replacement of the short restraint strap, but also poses a safety hazard of cargo fixation failure, which can easily lead to breakage and damage, affecting the service life of the device. Summary of the Invention

[0004] The purpose of this invention is to provide an automotive tensioner with a restraint strap anti-breakage structure to solve the problem mentioned in the background art that short restraint straps are prone to wear, breakage and damage.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a car tensioner with a restraint strap anti-breakage tightening structure, comprising a body, a positioning block disposed in the middle part of the body, a bolt rod detachably connected to the top of the body, a short restraint strap disposed on the outer side of the bolt rod, and a lubrication assembly disposed on the top of the body. The lubrication assembly includes an oil cavity opened inside the bolt rod, an oil filling pipe fixedly inserted into the top right side of the oil cavity, a sealing cap fixedly connected to the top of the oil filling pipe, a first piston movably connected inside the oil cavity, a first spring fixedly connected between the first piston and the inside of the bolt rod, an injection pipe fixedly inserted into the bottom left side of the bolt rod, a fixing sleeve snapped into the bottom of the injection pipe, a second piston movably connected inside the fixing sleeve, a limiting rod disposed at the bottom of the second piston, a limiting ring fixedly connected to the outer side of the positioning block, a limiting block fixedly connected to the outer side of the limiting ring, an oil passage opened inside the bolt rod, an inlet pipe fixedly connected inside the bolt rod, the inlet pipe communicating with the oil passage, and a rotating sleeve rotatably connected to the outer side of the bolt rod.

[0006] Preferably, a pressure relief pipe is fixedly inserted into the top left side of the bolt rod, and a pressure relief valve is installed inside the pressure relief pipe.

[0007] Preferably, an air inlet pipe is fixedly inserted into the rear side of the fixing sleeve, and check valves are installed inside both the air inlet pipe and the injection pipe.

[0008] Preferably, an elastic bladder is fixedly connected to the outer side of the rotating sleeve, the bottom of the short restraint strap is sleeved on the outer side of the elastic bladder, and an expansion assembly for controlling the expansion of the elastic bladder is disposed on the outside of the bolt rod.

[0009] Preferably, the expansion assembly includes a push plate movably connected inside the rotating sleeve, a small tube fixedly inserted between the rotating sleeve and the elastic bladder, a stud rotatably connected to the right side of the rotating sleeve, a translation sleeve threadedly connected to the outside of the stud, and an end of the translation sleeve fixedly connected to the push plate.

[0010] Preferably, the limiting rod includes a top shaft fixedly connected to the bottom of the second piston, a bottom shaft slidably connected to the bottom of the top shaft, a circular plate fixedly connected to the outer side of the bottom shaft, a second spring fixedly connected between the circular plate and the body, and the outer side of the bottom shaft slidably connected to the body.

[0011] Preferably, the top of the limiting block is inclined, and the bottom of the bottom shaft is rotatably connected to a ball to reduce motion damping.

[0012] Preferably, a nickel-titanium-based two-way shape memory alloy is fixedly connected between the bottom shaft and the top shaft.

[0013] Preferably, a blocking assembly is provided on the left side of the inlet pipe. The blocking assembly includes an inlet cover fixedly connected to the left side of the inlet pipe, a filter plate fixedly connected to the left side of the inlet cover, a media bladder fixedly connected inside the fixed sleeve, an inlet pipe inserted into the top of the media bladder, a round tube fixedly inserted into the end of the inlet pipe, a third piston movably connected inside the round tube, a connecting frame fixedly connected to the top of the third piston, a rack fixedly connected to the top of the connecting frame, a third spring fixedly connected between the third piston and the round tube, a rotating shaft rotatably connected to the middle part of the filter plate, a scraper fixedly connected to the outer side of the rotating shaft, a gear fixedly connected to the outer side of the rotating shaft, the outer side of the gear meshing with the rack, and the outer side of the scraper adhering to the filter plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention can provide lubricating oil during each binding process, providing lubrication between the rotating sleeve and the bolt rod. This can further reduce the wear of short binding straps, thereby reducing the occurrence of breakage and damage, and improving the service life of the device.

[0016] 2. This invention allows the elastic bladder to expand, thereby tightening the bottom of the short restraint strap and ensuring a large frictional force between the elastic bladder and the rotating sleeve. This prevents vibrations caused by vehicle movement from causing slight swaying of the goods. The relative rotation between the rotating sleeve and the short restraint strap causes wear. Since the relative rotation always occurs between the rotating sleeve and the bolt rod, it can further reduce the possibility of the short restraint strap breaking and damage, and improve the service life of the device.

[0017] 3. The present invention uses a flexible support and fixation short restraint strap. The flexibility of the elastic bag can further reduce the occurrence of breakage and damage, and improve the service life of the device.

[0018] 4. In winter, this invention results in a longer distance between the bottom of the bottom shaft and the top of the top shaft, placing the ball at a lower position. When the limiting block passes through the ball, the top shaft can move the second piston upward a greater distance, resulting in a larger amount of air entering the oil chamber at the left side of the first piston. This increases the amount of oil injected, thereby increasing the amount of oil injected in cold winter to improve the lubrication effect between the bolt rod and the rotating sleeve, further reducing wear on the short binding belt. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a side sectional view of the bolt rod of the present invention;

[0021] Figure 3 This is a half-sectional view of the bolt rod of the present invention.

[0022] Figure 4 This is a schematic diagram of the left half-section structure of the bolt rod of the present invention;

[0023] Figure 5 This is a schematic diagram of the right half-section structure of the bolt rod of the present invention;

[0024] Figure 6 This is a partial structural diagram of the limiting rod portion of the present invention;

[0025] Figure 7 This is a partial structural schematic diagram of the inlet tube of the present invention;

[0026] Figure 8 This is a schematic diagram of a half-section of the circular tube of the present invention;

[0027] Figure 9 This is a side sectional view of the fixing sleeve of the present invention.

[0028] In the attached diagram, the components represented by each number are as follows:

[0029] 1. Body; 2. Positioning block; 3. Bolt rod; 4. Short restraint strap; 5. Lubrication assembly; 51. Oil chamber; 52. Oil filling pipe; 53. Sealing cap; 54. First piston; 55. First spring; 56. Injection pipe; 57. Fixing sleeve; 58. Second piston; 59. Limiting rod; 591. Top shaft; 592. Bottom shaft; 593. Circular disc; 594. Second spring; 595. Ball; 596. Nickel-titanium based two-way shape memory alloy; 510. Limiting ring; 511. Limiting block; 512. Pressure relief pipe; 513. 514. Pressure relief valve; 515. Oil passage; 516. Inlet pipe; 517. Air inlet pipe; 518. Check valve; 519. Rotating sleeve; 6. Expansion assembly; 61. Push plate; 62. Small tube; 63. Stud; 64. Translation sleeve; 75. Blocking assembly; 71. Inlet cover; 72. Filter plate; 73. Medium bladder; 74. Inlet pipe; 75. Round tube; 76. Third piston; 77. Connecting frame; 78. Rack; 79. Third spring; 710. Rotating shaft; 711. Gear; 712. Scraper; 8. Elastic bladder. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides a technical solution: such as Figure 1 - Figure 9The illustrated car tensioner with a restraint strap anti-breakage structure includes a body 1, a positioning block 2 in the middle of the body 1, a bolt rod 3 detachably connected to the top of the body 1, a short restraint strap 4 on the outer side of the bolt rod 3, and a lubrication assembly 5 disposed on the top of the body 1. The lubrication assembly 5 includes an oil cavity 51 opened inside the bolt rod 3, an oil filling pipe 52 fixedly inserted into the top right side of the oil cavity 51, a sealing cap 53 fixedly connected to the top of the oil filling pipe 52, a first piston 54 movably connected inside the oil cavity 51, a first spring 55 fixedly connected between the first piston 54 and the inside of the bolt rod 3, and an injection pipe 56 fixedly inserted into the bottom left side of the bolt rod 3, with a retaining sleeve 57 snapped into the bottom of the injection pipe 56. The fixed sleeve 57 is internally connected to a second piston 58, and a limiting rod 59 is configured at the bottom of the second piston 58. A limiting ring 510 is fixedly connected to the outside of the positioning block 2, and a limiting block 511 is fixedly connected to the outside of the limiting ring 510. An oil passage 514 is opened inside the bolt rod 3, and an inlet pipe 515 is fixedly connected inside the bolt rod 3. The inlet pipe 515 communicates with the oil passage 514. A rotating sleeve 518 is rotatably connected to the outside of the bolt rod 3. A pressure relief pipe 512 is fixedly inserted into the top left side of the bolt rod 3. A pressure relief valve 513 is installed inside the pressure relief pipe 512. An air inlet pipe 516 is fixedly inserted into the rear side of the fixed sleeve 57. Check valves 517 are installed inside both the air inlet pipe 516 and the injection pipe 56.

[0032] The limiting rod 59 includes a top shaft 591 fixedly connected to the bottom of the second piston 58, a bottom shaft 592 slidably connected to the bottom of the top shaft 591, a circular piece 593 fixedly connected to the outside of the bottom shaft 592, a second spring 594 fixedly connected between the circular piece 593 and the body 1, the outside of the bottom shaft 592 slidably connected to the body 1, the top of the limiting block 511 is inclined, and a ball 595 for reducing motion damping is rotatably connected to the bottom of the bottom shaft 592.

[0033] The car tensioner is a mature existing technology. When using it, the long restraint strap is passed through the middle of the positioning block 2, and the hook at the end of the short restraint strap 4 is hooked to the anchor point on one side of the cargo. The long restraint strap is then wrapped around the cargo, and the hook at the other end is hooked to the anchor point on the other side of the cargo. Holding the bottom of the body 1, the handle is repeatedly turned, and the ratchet is turned by the pawl. The ratchet drives the positioning block 2 to rotate synchronously, and the long restraint strap is wound around the positioning block 2 to achieve tightening. This technology is a mature existing technology and will not be described in detail.

[0034] This solution involves placing the short restraint strap 4 outside the rotating sleeve 518. The rotating sleeve 518 rotates with the bolt rod 3. When the continuous vibration generated by the vehicle's movement causes the cargo to sway slightly, the relative rotation between the rotating sleeve 518 and the bolt rod 3 can reduce the wear of the short restraint strap 4, thereby reducing the possibility of breakage and damage, and improving the service life of the device.

[0035] Before use, lubricating oil needs to be added to the inside of the oil chamber 51. Lubricating oil is added through the filling pipe 52 by opening the sealing cap 53. After the lubricating oil is full, the sealing cap 53 is placed on top of the filling pipe 52 to ensure good sealing inside the oil chamber 51 to the right of the first piston 54.

[0036] It should be noted that the installation method and principle of the check valve 517 are mature existing technologies, and will not be elaborated on further. Under the action of the two check valves 517, air enters the interior of the fixed sleeve 57 from the interior of the air inlet pipe 516, and can enter the interior of the oil chamber 51 located on the left side of the first piston 54 from the injection pipe 56.

[0037] Through the above technical solution, when binding and tightening, it is necessary to turn the bottom of the main body 1 to make the positioning block 2 rotate. At this time, the limiting ring 510 can rotate with the limiting block 511, and the limiting block 511 can pass through the bottom of the limiting rod 59. During this process, the limiting block 511 first squeezes the bottom of the limiting rod 59, causing the second piston 58 to move upward. At this time, it is convenient to push the air inside the fixed sleeve 57 into the inside of the injection pipe 56, and enter the oil chamber 51 from the injection pipe 56, located to the left of the first piston 54. When the limiting block 511 leaves the limiting rod 59, under the elastic force of the second spring 594, the limiting rod 59 moves downward with the second piston 58, which facilitates the air to enter the inside of the fixed sleeve 57 from the air inlet pipe 516, preparing for the next air injection.

[0038] It should be noted that, since the oil chamber 51 is located on the right side of the first piston 54 and has good sealing, the lubricating oil will not flow out of the oil passage 514 in the initial state. During binding, air can enter the oil chamber 51 located on the left side of the first piston 54. Under the action of air pressure, the first piston 54 can overcome the elastic force of the first spring 55 and move to the right. This allows the lubricating oil to enter the oil passage 514 through the inside of the inlet pipe 515 and then enter the space between the bolt rod 3 and the rotating sleeve 518 through the oil passage 514.

[0039] This design allows for lubrication during each binding process, providing lubrication between the rotating sleeve 518 and the bolt rod 3. This further reduces wear on the short binding band 4, thereby reducing the likelihood of breakage and extending the lifespan of the device.

[0040] When the lubricating oil inside the oil chamber 51 decreases and needs to be added, the pressure relief valve 513 on the pressure relief pipe 512 is opened and the sealing cap 53 is removed. Under the elastic force of the first spring 55, the first piston 54 can be moved to the left to reset, and then lubricating oil can be added through the filling pipe 52.

[0041] An elastic bladder 8 is fixedly connected to the outside of the rotating sleeve 518. The bottom of the short restraint strap 4 is sleeved on the outside of the elastic bladder 8. An expansion assembly 6 for controlling the expansion of the elastic bladder 8 is arranged on the outside of the bolt rod 3. The expansion assembly 6 includes a push plate 61 movably connected inside the rotating sleeve 518. A small tube 62 is fixedly inserted between the inside of the rotating sleeve 518 and the elastic bladder 8. A stud 63 is rotatably connected to the right side of the rotating sleeve 518. A translation sleeve 64 is threadedly connected to the outside of the stud 63. The end of the translation sleeve 64 is fixedly connected to the push plate 61.

[0042] It should be noted that sealing rings are installed on both the inner and outer sides of the push plate 61.

[0043] With the above technical solution, when installing the short restraint strap 4, the bottom of the short restraint strap 4 is sleeved on the outside of the elastic bladder 8. Then, by rotating the stud 63 with an external tool, the sliding sleeve 64 can move to the left with the push plate 61 under the action of the threaded connection. This facilitates the air inside the rotating sleeve 518 to be pushed into the elastic bladder 8 through the small tube 62, which can cause the elastic bladder 8 to expand. This allows the elastic bladder 8 to tighten the bottom of the short restraint strap 4, ensuring a large frictional force between the elastic bladder 8 and the rotating sleeve 518. This prevents the goods from swaying slightly due to vibrations caused by vehicle movement. The relative rotation between the rotating sleeve 518 and the short restraint strap 4 causes wear. The relative rotation always occurs between the rotating sleeve 518 and the bolt rod 3, which can further reduce the possibility of the short restraint strap 4 breaking and damage, and improve the service life of the device.

[0044] It should be noted that this solution uses flexible support to fix the short restraint strap 4 and the elastic bladder 8, which has the characteristics of flexibility, to further reduce the possibility of breakage and damage and improve the service life of the device.

[0045] A nickel-titanium-based two-way shape memory alloy 596 is fixedly connected between the bottom shaft 592 and the top shaft 591.

[0046] It should be noted that the lubrication effect will be affected at lower temperatures.

[0047] Through the above technical solution, the length of the nickel-titanium based two-way shape memory alloy 596 will increase when the temperature is low in cold winter, making the distance between the bottom of the bottom shaft 592 and the top of the top shaft 591 longer, so that the ball 595 is located at a lower position. At this time, when the limiting block 511 passes through the ball 595, the top shaft 591 can move the second piston 58 upward a greater distance, so that the amount of air entering the oil chamber 51 at the left position of the first piston 54 is greater, increasing the amount of oil injected. This can increase the amount of oil injected in cold winter, thereby improving the lubrication effect between the bolt rod 3 and the rotating sleeve 518, and further reducing the wear of the short binding band 4.

[0048] A blocking assembly 7 is provided on the left side of the inlet pipe 515. The blocking assembly 7 includes an inlet cover 71 fixedly connected to the left side of the inlet pipe 515. A filter plate 72 is fixedly connected to the left side of the inlet cover 71. A media bladder 73 is fixedly connected inside the fixing sleeve 57. An inlet pipe 74 is inserted into the top of the media bladder 73. A round pipe 75 is fixedly inserted into the end of the inlet pipe 74. A third piston 76 is movably connected inside the round pipe 75. A connecting frame 77 is fixedly connected to the top of the third piston 76. A rack 78 is fixedly connected to the top of the connecting frame 77. A third spring 79 is fixedly connected between the third piston 76 and the round pipe 75. A rotating shaft 710 is rotatably connected to the middle part of the filter plate 72. A scraper 712 is fixedly connected to the outside of the rotating shaft 710. A gear 711 is fixedly connected to the outside of the rotating shaft 710. The outside of the gear 711 meshes with the rack 78. The outside of the scraper 712 is in contact with the filter plate 72.

[0049] Lubricating oil is prone to sedimentation during storage. If this sediment is injected into the lubrication point, it will affect the lubrication effect.

[0050] Through the above technical solution, the filter plate 72 is provided with filter holes for filtering sediment to prevent it from affecting the lubrication effect.

[0051] When the binding is tightened, the limiting block 511 presses against the limiting rod 59, causing the second piston 58 to move. This allows the second piston 58 to press against the medium bladder 73, enabling the medium inside the medium bladder 73 to enter the interior of the circular tube 75 through the inlet pipe 74. This allows the third piston 76 to overcome the elastic force of the third spring 79 and move upwards, causing the connecting frame 77 to move with the rack 78. Under the action of the gear 711 meshing with the rack 78 on the outside, the rotating shaft 710 can rotate with the scraper 712, causing the scraper 712 to scrape the impurities on the filter plate 72, ensuring that the subsequent lubricating oil can flow smoothly into the interior of the inlet pipe 515.

[0052] Working principle: When binding and tightening, the bottom of the main body 1 needs to be turned to rotate the positioning block 2. At this time, the limiting ring 510 can rotate along with the limiting block 511, allowing the limiting block 511 to pass through the bottom of the limiting rod 59. During this process, the limiting block 511 first squeezes the bottom of the limiting rod 59, causing the second piston 58 to move upward. This facilitates the pushing of air from the fixed sleeve 57 into the injection pipe 56, and then into the oil chamber 51 located to the left of the first piston 54. When the limiting block 511 leaves the limiting rod 59, under the elastic force of the second spring 594, the limiting rod 59 moves the second piston 58 upward. The downward movement facilitates air entering the interior of the fixed sleeve 57 from the air inlet pipe 516, preparing for the next air injection. During binding, under the action of air pressure, the first piston 54 can overcome the elastic force of the first spring 55 and move to the right, allowing lubricating oil to enter the oil passage 514 through the interior of the inlet pipe 515, and then enter the space between the bolt rod 3 and the rotating sleeve 518 through the oil passage 514. This ensures that lubricating oil is supplied every time binding is performed, providing lubrication between the rotating sleeve 518 and the bolt rod 3. This further reduces the wear of the short binding band 4, thereby reducing the possibility of breakage and damage, and improving the service life of the device.

[0053] By rotating the stud 63 with an external tool, the sliding sleeve 64, along with the push plate 61, can move to the left under the action of the threaded connection. This facilitates the air inside the rotating sleeve 518 to be pushed into the elastic bladder 8 through the small tube 62, causing the elastic bladder 8 to expand. This tightens the elastic bladder 8 against the bottom of the short restraint strap 4, ensuring a large frictional force between the elastic bladder 8 and the rotating sleeve 518. This prevents the goods from swaying slightly due to vibrations caused by vehicle movement. The relative rotation between the rotating sleeve 518 and the short restraint strap 4 causes wear. This relative rotation always occurs between the rotating sleeve 518 and the bolt rod 3, which can further reduce the possibility of the short restraint strap 4 breaking and damage, thus improving the service life of the device.

[0054] Because the limiting block 511 presses against the limiting rod 59, the second piston 58 moves, which facilitates the second piston 58 to press against the medium bladder 73. This allows the medium inside the medium bladder 73 to enter the interior of the circular tube 75 through the inlet pipe 74. The third piston 76 can overcome the elastic force of the third spring 79 and move upward. The connecting frame 77 moves with the rack 78. Under the action of the gear 711 meshing with the rack 78 on the outside, the rotating shaft 710 can rotate with the scraper 712. The scraper 712 scrapes the impurities on the filter plate 72, ensuring that the subsequent lubricating oil can flow smoothly into the interior of the inlet pipe 515.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A car tensioner with a restraint strap anti-breakage tightening structure, comprising a body (1), wherein a positioning block (2) is disposed in the middle part of the body (1), a bolt rod (3) is detachably connected to the top of the body (1), and a short restraint strap (4) is disposed on the outer side of the bolt rod (3), characterized in that, Also includes: A lubrication assembly (5) is disposed on the top of the main body (1). The lubrication assembly (5) includes an oil chamber (51) opened inside the bolt rod (3). A filling pipe (52) is fixedly inserted into the top right side of the oil chamber (51). A sealing cap (53) is fixedly connected to the top of the filling pipe (52). A first piston (54) is movably connected inside the oil chamber (51). A first spring (55) is fixedly connected between the first piston (54) and the inside of the bolt rod (3). An injection pipe (56) is fixedly inserted into the bottom left side of the bolt rod (3). A fixed clamp is snapped into the bottom of the injection pipe (56). The fixed sleeve (57) is movably connected to the inside of the fixed sleeve (57). The bottom of the second piston (58) is provided with a limiting rod (59). The outer side of the positioning block (2) is fixedly connected with a limiting ring (510). The outer side of the limiting ring (510) is fixedly connected with a limiting block (511). The bolt rod (3) has an oil passage (514) inside. The bolt rod (3) has an inlet pipe (515) fixedly connected inside. The inlet pipe (515) is connected to the oil passage (514). The outer side of the bolt rod (3) is rotatably connected with a rotating sleeve (518).

2. The car tensioner with a restraint strap anti-breakage retraction structure according to claim 1, characterized in that: A pressure relief pipe (512) is fixedly inserted into the top left side of the bolt rod (3), and a pressure relief valve (513) is installed inside the pressure relief pipe (512).

3. A car tensioner with a restraint strap anti-breakage retraction structure according to claim 1, characterized in that: An air inlet pipe (516) is fixedly inserted into the rear side of the fixed sleeve (57), and a check valve (517) is installed inside both the air inlet pipe (516) and the injection pipe (56).

4. A car tensioner with a restraint strap anti-breakage retraction structure according to claim 1, characterized in that: An elastic bladder (8) is fixedly connected to the outside of the rotating sleeve (518), the bottom of the short restraint strap (4) is sleeved on the outside of the elastic bladder (8), and an expansion assembly (6) for controlling the expansion of the elastic bladder (8) is arranged on the outside of the bolt rod (3).

5. A car tensioner with a restraint strap anti-breakage retraction structure according to claim 4, characterized in that: The expansion assembly (6) includes a push plate (61) movably connected inside the rotating sleeve (518). A small tube (62) is fixedly inserted between the rotating sleeve (518) and the elastic bladder (8). A stud (63) is rotatably connected to the right side of the rotating sleeve (518). A translation sleeve (64) is threadedly connected to the outside of the stud (63). The end of the translation sleeve (64) is fixedly connected to the push plate (61).

6. A car tensioner with a restraint strap anti-breakage retraction structure according to claim 5, characterized in that: The limiting rod (59) includes a top shaft (591) fixedly connected to the bottom of the second piston (58), a bottom shaft (592) slidably connected to the bottom of the top shaft (591), a circular piece (593) fixedly connected to the outside of the bottom shaft (592), a second spring (594) fixedly connected between the circular piece (593) and the body (1), and the outside of the bottom shaft (592) slidably connected to the body (1).

7. A car tensioner with a restraint strap anti-breakage retraction structure according to claim 6, characterized in that: The top of the limiting block (511) is inclined, and the bottom of the bottom shaft (592) is rotatably connected to a ball (595) to reduce motion damping.

8. A car tensioner with a restraint strap anti-breakage retraction structure according to claim 7, characterized in that: A nickel-titanium-based two-way shape memory alloy (596) is fixedly connected between the bottom shaft (592) and the top shaft (591).

9. A car tensioner with a restraint strap anti-breakage retraction structure according to claim 1, characterized in that: A blocking assembly (7) is disposed on the left side of the inlet pipe (515). The blocking assembly (7) includes an inlet cover (71) fixedly connected to the left side of the inlet pipe (515). A filter plate (72) is fixedly connected to the left side of the inlet cover (71). A media bladder (73) is fixedly connected inside the fixing sleeve (57). An inlet pipe (74) is inserted into the top of the media bladder (73). A round pipe (75) is fixedly inserted into the end of the inlet pipe (74). A third piston (76) is movably connected inside the round pipe (75). The top of the third piston (76) is... A connecting frame (77) is fixedly connected to the filter plate (72), and a rack (78) is fixedly connected to the top of the connecting frame (77). A third spring (79) is fixedly connected between the third piston (76) and the round tube (75). A rotating shaft (710) is rotatably connected to the middle part of the filter plate (72). A scraper (712) is fixedly connected to the outside of the rotating shaft (710). A gear (711) is fixedly connected to the outside of the rotating shaft (710). The outside of the gear (711) meshes with the rack (78). The outside of the scraper (712) is in contact with the filter plate (72).

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