Safety belt tension testing device and use method

Abstract

The invention relates to the technical field of safety belts, in particular to a safety belt tension testing device and a using method.The safety belt tension testing device comprises a device base, the top surface of the device base is fixedly connected with a hinge mounting seat, and the top surface of the device base is fixedly connected with a belt wheel mounting seat; an air cylinder supporting frame is fixedly connected to the surface of the top of the device base, a driving air cylinder is fixedly connected to the surface of the inner side of the air cylinder supporting frame, an inner mounting shell is fixedly connected to the surface of the top of the device base, and a clamping jaw limiting groove is formed in the surface of the top of the inner mounting shell. A belt passing groove is formed in the surface of the outer side of the inner mounting shell, a clamping jaw expansion mechanism is arranged at the output end of the driving air cylinder, a clamping jaw clamping mechanism is arranged on the surface of the outer side of the clamping jaw expansion mechanism, and an expansion limiting mechanism is arranged on the surface of the top of the inner mounting shell; and an equidistant conveying mechanism is arranged on the surface of the top of the belt wheel mounting seat.

Description

Technical Field

[0001] The invention relates to the technical field of safety belts, and in particular to a safety belt tension testing device and a use method thereof. Background Art

[0002] Seat belts are a vital safety device in cars. They are mainly composed of webbing, retractors, locking mechanisms, etc., and are used to secure drivers and passengers in their seats. In the event of a vehicle collision or emergency braking, seat belts can effectively prevent people from being thrown out of the car or from violent collisions inside the car, thereby reducing the risk of injury. Make sure that the seat belts are not damaged or twisted, and check them regularly to see if they are functioning properly.

[0003] The tension of the seat belt needs to be tested during use.

[0004] The existing patent (publication number: CN219715026U) discloses a seat belt tension test device, which relates to the field of automobile parts detection technology, including a base, a gantry is fixed on the top of the base, a T-shaped bottom column is fixed on the top of the base located in the gantry, a movable beam is arranged on the top of the inner top of the gantry, and sliding grooves are opened on the inner walls of both sides of the gantry, a screw rod is rotated in one of the sliding grooves, and the top of the screw rod is connected to the gantry, the seat belt is bypassed over the upper semicircular block, inserted into the top of the L-shaped groove side wall, and passed through the bottom of the L-shaped groove, and is pressed against one end of the upper semicircular block close to the lower semicircular block by rotating and rising the adjusting screw rod, and the seat belt can be clamped during tension detection by the reaction force and the extrusion force of the adjusting screw rod, and there will be no slipping and dislocation phenomenon, which effectively ensures the accuracy of the tension detection data. In the above-mentioned equipment, the two ends of the seat belt are clamped separately and then stretched during the detection process. The detection process is an overall detection. The longer the seat belt is, the longer the required stretching length is, and a larger stretching range is required. In addition, the seat belt may cause damage to the surrounding environment after it breaks and is thrown off. When using a reel for a tensile test, since the seat belt may have local problems, the reeled part does not participate in the test, and it may be difficult to accurately locate the defective position of the seat belt. If the seat belt is long, the existing device may require multiple manual adjustments of the position, which is inefficient and prone to errors.

[0005] In view of this, we propose a seat belt tension testing device and a method for using it. Summary of the invention

[0006] The object of the present invention is to provide a safety belt tension test device and a method of use, so as to solve the problem that the existing safety belt tension test device proposed in the above background technology has a limited detection range when testing the safety belt. To achieve the above object, the present invention provides the following technical solutions: a safety belt tension test device, comprising a device base, the top surface of the device base is fixedly connected with a hinged mounting seat, the top surface of the device base is fixedly connected with a pulley mounting seat, the top surface of the device base is fixedly connected with a cylinder support frame, the inner side surface of the cylinder support frame is fixedly connected with a driving cylinder, the top surface of the device base is fixedly connected with an inner mounting shell, the top surface of the inner mounting shell is provided with a clamping jaw limiting groove, the outer side surface of the inner mounting shell is provided with a belt passing groove, the output end of the driving cylinder is provided with a clamping jaw expansion mechanism, the outer side surface of the clamping jaw expansion mechanism is provided with a clamping jaw clamping mechanism, the top surface of the inner mounting shell is provided with an expansion limiting mechanism, and the top surface of the pulley mounting seat is provided with an equidistant conveying mechanism.

[0007] Preferably, the number of the articulated mounting seats is two, and the two articulated mounting seats are symmetrically distributed with the central axis of the device base as the axis of symmetry, the number of the pulley mounting seats is two, and the two pulley mounting seats are symmetrically distributed with the central axis of the device base as the axis of symmetry, and the number of the inner mounting shells is two, and the two inner mounting shells are symmetrically distributed with the central axis of the rotating shaft shell as the axis of symmetry.

[0008] Preferably, the clamping jaw expansion mechanism includes a cylinder output shaft, the bottom surface of the cylinder output shaft is fixedly connected with an expansion linkage seat, the inner surface of the expansion linkage seat is hingedly connected with an expansion push-pull arm, one end of the expansion push-pull arm is hingedly connected with a push-pull articulated shell, the outer surface of the push-pull articulated shell is fixedly connected with a driving lever, the outer surface of the driving lever is slidably connected with an expansion sleeve, the outer surface of the expansion sleeve is rotatably connected with an expansion input rod, the outer surface of the expansion input rod is fixedly connected with a delay bump, the outer surface of the expansion input rod is slidably connected with an expansion output rod, a delay groove is provided on the outer surface of the expansion output rod, the other end of the expansion output rod is fixedly connected with a clamping arm articulated seat, the inner surface of the clamping arm articulated seat is hingedly connected with a clamping jaw, the other end of the clamping jaw is hingedly connected with the expansion clamp, and the bottom surface of the expansion clamp is fixedly connected with an expansion limit column.

[0009] Preferably, the number of the expansion push-pull arms is two, and the two expansion push-pull arms are symmetrically distributed with the central axis of the expansion linkage seat as the axis of symmetry, the other end of the driving lever is hingedly connected to the articulated mounting seat, the delay protrusion is slidably connected to the delay slide groove, the number of the clamping claw arms on each clamping arm articulated seat is two, and the two clamping claw arms are symmetrically distributed with the central axis of the clamping arm articulated seat as the axis of symmetry, the number of the clamping arm articulated seats is two, the number of the expansion clamping claws is four, and the expansion limit column is slidably connected to the inner surface of the clamping claw limit groove.

[0010] Preferably, the clamping mechanism of the clamping jaw includes a clamping sleeve, which is slidably connected to the outer surface of the driving lever, the outer surface of the clamping sleeve is rotatably connected to a clamping input arm, the other end of the clamping input arm is fixedly connected to a sliding seat, the outer surface of the sliding seat is fixedly connected to an embedded seat, the outer surface of the embedded seat is fixedly connected to a driven plate, the outer surface of the expansion jaw is provided with a mounting groove, the inner surface of the mounting groove is fixedly connected to a clamping jaw limiting column, the inner surface of the mounting groove is slidably connected to an outer sliding frame, and the outer surface of the outer sliding frame is fixedly connected to an anti-slip groove.

[0011] Preferably, there are two clamping sleeves, and the two clamping sleeves are respectively slidably connected to the driving levers on both sides, the embedded seat is slidably connected to the inner surface of the inner mounting shell, the driven plate is slidably connected to the outer surface of the expansion jaw, and the jaw limit column passes through the outer sliding frame and is slidably connected to its inner wall.

[0012] Preferably, the expansion limiting mechanism includes an axis mounting seat, the axis mounting seat is fixedly connected to the top surface of the inner mounting shell, the inner surface of the axis mounting seat is rotatably connected with a rotating shaft, both ends of the rotating shaft are fixedly connected with threaded shafts, the outer surface of the threaded shaft is threadedly connected with an adjusting slider, the bottom surface of the adjusting slider is slidably connected with an inner hinged rod, and the outer surface of the inner hinged rod is slidably connected with an outer hinged rod.

[0013] Preferably, the threaded shafts at both ends of the rotating shaft have opposite rotation directions, the inner hinged rod is rotationally connected to the top surface of the expansion jaw, and the top surface of the outer hinged rod is rotationally connected to the top surface of the expansion jaw.

[0014] The outer surface of the gear is fixedly connected with the driving gear, and the outer surface of the driving gear is fixedly connected with the driving gear, and the outer surface of the driving gear is sleeved with a connecting belt, and the other end of the connecting belt is sleeved with an intermediate belt pulley, the outer surface of the pulley mounting seat is rotatably connected with a meshing gear, the inner surface of the meshing gear is provided with a ratchet groove, and the other side surface of the conveyor belt pulley is fixedly connected with an output disk, the inner surface of the output disk is slidably connected with a spring mounting rod, the outer surface of the spring mounting rod is sleeved with a ratchet reset spring, one end of the spring mounting rod is fixedly connected with a control ratchet, the outer surface of the meshing gear is meshed with an active rack, the outer surface of the active rack is fixedly connected with an adjusting screw rod, the outer surface of the active rack is slidably connected with a lifting seat, and the bottom surface of the lifting seat is rotatably connected with an adjusting knob.

[0015] Preferably, the number of the conveyor pulleys is two, and the two conveyor pulleys are symmetrically distributed with the central axis of the device base as the symmetry axis, the number of the driving pulleys and the intermediate pulleys are both two, and the two driving pulleys and the two intermediate pulleys are symmetrically distributed with the central axis of the device base as the symmetry axis, and the driving pulleys and the intermediate pulleys are connected by a connecting belt, and the connecting belt passes through the device base and is slidably connected to the inner wall of the device, the number of the meshing gears is one, the number of the output disk is one, the control pawl is slidably connected to the inner surface of the output disk, the number of the control pawls is six, and the six control pawls are distributed in a ring around the center of the output disk, the control pawl meshes with the ratchet groove, the lifting seat is fixedly connected to the top surface of the expansion linkage seat, and the adjusting knob is threadedly connected to the adjusting screw.

[0016] A method for using a safety belt tension testing device comprises the following steps:

[0017] S1. Rewind the two ends of the safety belt to be tested onto the conveyor pulleys on both sides. In the initial state, the driving cylinder is extended to the bottom, the four expansion jaws are in the middle position, and the safety belt passes through the expansion jaws on both sides;

[0018] S2. Start the driving cylinder to drive the cylinder output shaft to rise, pull the expansion push-pull arms on both sides through the expansion linkage seat to reduce its angle, and pull the driving lever through the push-pull hinged shell. The driving lever gradually returns to the center from the state of being tilted to both sides. In the process of returning to the center, the expansion sleeve and the clamping sleeve are pushed respectively. Since both the expansion sleeve and the clamping sleeve can slide on the driving lever, they can adapt to the rotation angle of the driving lever, and the height remains unchanged. The expansion sleeve pushes the expansion input rod inward, and the expansion input rod drives the delay protrusion to slide in the delay slot. It will continue to push the expansion output rod to achieve delay only when it contacts the other side of the delay slot. The expansion output rod pushes the clamp arm hinge seat to make it close to the inner mounting shell, and pushes the clamp arm to both sides, driving the expansion clamp to push to both sides. Due to the limitation of the expansion limit column and the clamping claw limit groove, the expansion clamping claw realizes direct movement to both sides, and the clamping sleeve pushes the clamping input arm to drive the sliding seat and the embedded seat to move inward, and pushes the driven plate to move on the expansion clamping claw, and the driven plate then pushes the outer sliding frame and the anti-skid groove to clamp the inner safety belt, so that only the driving lever needs to be pulled to drive the anti-skid groove to clamp the safety belt at the same time, and the expansion clamping claw is used to pull the clamped safety belt to both sides, so as to detect the tensile strength. The expansion sleeve and the clamping sleeve are at different distances from the rotation center on the driving lever. The expansion sleeve is farther and has a larger moving distance for pulling the expansion safety belt apart. The clamping sleeve has a smaller moving distance and generates a larger force, which is used to clamp the safety belt on both sides. In addition, there is a delay in stretching and expansion, and the safety belt will be clamped first and then stretched and expanded.

[0019] S3. When the driving cylinder drives the cylinder output shaft to rise, the expansion linkage seat will drive the lifting seat and the active rack to rise, and the active rack will drive the meshing gear to rotate. However, at this time, the rotation direction of the ratchet groove is opposite to that of the control pawl. The arc surface of the ratchet groove contacts the control pawl, pressing the control pawl into the inside of the output disk, and will not play a rotating role. When the driving cylinder drives the cylinder output shaft to descend, it means that the tensile strength test is completed. The expansion linkage seat will drive the lifting seat and the active rack to descend, the anti-skid groove is loosened and no longer clamps the safety belt, and the expansion clamp is also retracted. After the active rack descends for a period of time, it contacts the meshing gear and rotates in the opposite direction. At this time, the rotation direction of the ratchet groove is the same as that of the control pawl. The other side of the ratchet groove contacts the control pawl, and the control pawl is no longer pressed in but driven to rotate. The conveyor pulley rotates and transmits the rotation to the conveyor pulley on the other side through the driving pulley, the intermediate pulley, and the connecting belt. The conveyor pulleys on both sides rotate at the same time and convey the conveyor belt for a distance for the next detection. In this way, the safety belt is segmented and the detection range is increased, and the defective segment can be directly located.

[0020] S4. Adjust the tensile strength and length of each test. Rotate the rotating shaft to drive the threaded shafts on both sides to rotate at the same time. The threaded shafts on both sides rotate in the same direction but the threads rotate in opposite directions. The moving directions of the adjusting sliders are opposite, and they will move inward or outward at the same time, thereby changing the position of the adjusting slider on the shaft mounting seat. During the test, when the expansion jaws on both sides are pulled apart, the inner hinged rod and the outer hinged rod will be pulled apart until the ends of the inner hinged rod and the outer hinged rod contact the bottom of the adjusting slider. At this time, the position of the adjusting slider is fixed, and the inner hinged rod and the outer hinged rod are not The expansion jaws cannot continue to be pulled apart, and the driving cylinder cannot continue to pull, so as to adjust the tensile strength of each test. The telescopic length of the driving cylinder is controlled by the stretching spacing of the expansion jaws, and the lifting height of the active rack is controlled at the same time. The length of the conveyor belt each time corresponds to the strength of the test. The higher the strength, the longer the length of the safety belt each time. However, the height of the active rack can be changed by turning the adjusting knob to raise and lower the adjusting screw, thereby changing the meshing range of the active rack with the meshing gear when the active rack is raised and lowered, and the length of the conveyor belt each time can be manually adjusted.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] In the present invention, the jaw expansion mechanism and the jaw clamping mechanism cooperate with each other. The main function of the jaw expansion mechanism is to apply tension to the safety belt by pulling the jaws outward after clamping the safety belt, so as to detect the tensile strength of the safety belt. The function of the jaw clamping mechanism is to ensure that the safety belt is firmly clamped before the tensile test. This sequence ensures that the safety belt will not slip during the stretching process, thereby improving the accuracy and reliability of the test.

[0023] In the present invention, the jaw expansion mechanism and the expansion limiting mechanism cooperate with each other, and the expansion limiting mechanism limits the maximum pulling distance of the expansion jaws by adjusting the slider, so as to accurately control the strength of each stretching. This control method can flexibly adjust the test strength according to the specifications and requirements of different safety belts, so as to avoid damage to the safety belt or inaccurate test results due to excessive tensile strength.

[0024] In the present invention, the equidistant conveying mechanism and the clamping claw expansion mechanism cooperate with each other, and the equidistant conveying mechanism conveys the safety belt in sections. After conveying a section each time, the clamping claw expansion mechanism performs a tensile test. This segmented detection method not only increases the detection range, but also can accurately locate the defective position of the safety belt, thereby improving the detection efficiency and accuracy. The entire process is carried out automatically, thereby improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic side view of the overall structure of the present invention;

[0026] Figure 2The inner mounting housing and the clamping jaw expansion mechanism of the present invention;

[0027] Figure 3 The components of the clamping jaw expansion mechanism of the present invention;

[0028] Figure 4 The driving lever, expansion sleeve, expansion input rod and clamping sleeve of the present invention;

[0029] Figure 5 The expansion input rod, delay bump, expansion output rod and delay chute of the present invention;

[0030] Figure 6 The driven plate, mounting groove, clamping jaw limiting column, outer sliding frame and anti-slip groove of the present invention;

[0031] Figure 7 The clamping sleeve, clamping input arm, sliding seat, embedded seat and driven plate of the present invention;

[0032] Figure 8 The components of the expansion limiting mechanism of the present invention;

[0033] Fig. 9 The shaft mounting seat, the adjusting slider, the inner hinge rod and the outer hinge rod of the present invention;

[0034] Fig.10 The expansion clamping jaws, the adjustment slider, the inner hinged rod and the outer hinged rod of the present invention;

[0035] Fig.11 The clamping jaw expansion mechanism, the clamping jaw clamping mechanism and the expansion limiting mechanism of the present invention;

[0036] Fig.12 The equidistant conveying mechanism of the present invention;

[0037] Fig.13 The active rack, the adjusting screw rod, the lifting seat and the adjusting knob of the present invention;

[0038] Fig.14 The conveyor pulley, meshing gear and output disc of the present invention;

[0039] Fig.15 For the present invention Fig.14 Enlarged view of point A in the middle.

[0040] In the figure: 1, device base; 2, hinged mounting seat; 21, pulley mounting seat; 3, cylinder support frame; 31, driving cylinder; 4, inner mounting shell; 41, clamping jaw limiting groove; 42, belt passing groove; 5, clamping jaw expansion mechanism; 51, cylinder output shaft; 52, expansion linkage seat; 521, expansion push-pull arm; 53, push-pull hinged shell; 531, driving lever; 54, expansion sleeve; 541, expansion input rod; 542, delay bump; 55, expansion output rod; 551, delay slide; 56, clamping arm hinge seat; 561, clamping jaw arm; 57, expansion clamping jaw; 571, expansion limiting column; 6, clamping jaw clamping mechanism; 61, clamping sleeve; 611, clamping input arm; 612, slide Moving seat; 613, embedded seat; 62, driven plate; 63, mounting groove; 631, clamping claw limit column; 64, outer sliding frame; 65, anti-skid groove; 7, expansion limit mechanism; 71, shaft mounting seat; 72, rotating shaft; 721, threaded shaft; 73, adjusting slider; 74, inner hinge rod; 741, outer hinge rod; 8, equidistant conveying mechanism; 81, conveying pulley; 82, driving pulley; 821, connecting belt; 822, intermediate pulley; 83, meshing gear; 831, ratchet groove; 84, output disk; 841, spring mounting rod; 842, ratchet pawl return spring; 843, control ratchet; 85, driving rack; 851, adjusting screw rod; 86, lifting seat; 861, adjusting knob. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figures 1 to 15The present invention provides a technical solution: a safety belt tension test device, comprising a device base 1, a hinged mounting seat 2 is fixedly connected to the top surface of the device base 1, a pulley mounting seat 21 is fixedly connected to the top surface of the device base 1, a cylinder support frame 3 is fixedly connected to the top surface of the device base 1, a driving cylinder 31 is fixedly connected to the inner side surface of the cylinder support frame 3, an inner mounting shell 4 is fixedly connected to the top surface of the device base 1, a clamping jaw limiting groove 41 is provided on the top surface of the inner mounting shell 4, a belt passing groove 42 is provided on the outer side surface of the inner mounting shell 4, a clamping jaw expansion mechanism 5 is provided at the output end of the driving cylinder 31, and the outer side surface of the clamping jaw expansion mechanism 5 A clamping mechanism 6 is provided, an expansion limiting mechanism 7 is provided on the top surface of the inner mounting shell 4, and an equidistant conveying mechanism 8 is provided on the top surface of the pulley mounting seat 21. The device base 1 and the inner mounting shell 4 are used to install and protect and other components, and provide installation positions and activity space. The pulley mounting seats 21 on both sides are used to install the conveying pulleys 81 on both sides to convey the safety belts required for inspection. The driving cylinder 31 requires a higher initial height to drive the expansion linkage seat 52 to have a longer moving path, and is installed at a higher position through the cylinder support frame 3. The clamping jaw limiting groove 41 limits the moving path of the expansion jaw 57, and the belt passing groove 42 is used for the safety belt to pass through the expansion jaw 57.

[0043] There are two articulated mounting seats 2, and the two articulated mounting seats 2 are symmetrically distributed with the central axis of the device base 1 as the symmetry axis. There are two pulley mounting seats 21, and the two pulley mounting seats 21 are symmetrically distributed with the central axis of the device base 1 as the symmetry axis. There are two inner mounting shells 4, and the two inner mounting shells 4 are symmetrically distributed with the central axis of the rotating shaft shell as the symmetry axis.

[0044] The clamp expansion mechanism 5 includes a cylinder output shaft 51, the bottom surface of the cylinder output shaft 51 is fixedly connected to an expansion linkage seat 52, the inner surface of the expansion linkage seat 52 is hingedly connected to an expansion push-pull arm 521, one end of the expansion push-pull arm 521 is hingedly connected to a push-pull hinge shell 53, the outer surface of the push-pull hinge shell 53 is fixedly connected to a driving lever 531, the outer surface of the driving lever 531 is slidably connected to an expansion sleeve 54, the outer surface of the expansion sleeve 54 is rotatably connected to an expansion input rod 541, and the outer surface of the expansion input rod 541 is fixedly connected to a delay lever 531. The outer surface of the expansion input rod 541 is slidably connected with the expansion output rod 55, and the outer surface of the expansion output rod 55 is provided with a delay groove 551. The other end of the expansion output rod 55 is fixedly connected with a clamp arm hinge seat 56, and the inner surface of the clamp arm hinge seat 56 is hingedly connected with a clamp arm 561, and the other end of the clamp arm 561 is hingedly connected with an expansion clamp 57, and the bottom surface of the expansion clamp 57 is fixedly connected with an expansion limit column 571. Through the setting of the clamp expansion mechanism 5, during use, the expansion linkage seat 52 will push and pull the expansion jaws on both sides when it is raised and lowered. The push-pull arm 521 changes the included angle of the expansion push-pull arm 521. When the included angle is at the bottom, the maximum included angle is 180 degrees. When the included angle decreases, the spacing will also decrease, thereby pulling the push-pull hinge shell 53. The expansion push-pull arm 521 is rotatably connected to the push-pull hinge shell 53 to adapt to different angles of the expansion push-pull arm 521. The push-pull hinge shell 53 is farthest from the rotation center of the driving lever 531 and is a labor-saving lever. When the driving lever 531 rotates inward or outward, it pushes or pulls the expansion sleeve 54. The expansion sleeve 54 can slide on the driving lever 531 to maintain the height but will rotate The expansion input rod 541 is rotatably connected to the expansion sleeve 54 to adapt to the different angles of the expansion sleeve 54, so as to achieve the effect of using the driving lever 531 to push the expansion input rod 541, and use the delayed protrusion 542 and the delayed slide groove 551 to delay the pushing of the expansion output rod 55, so that the expansion safety belt can be pulled after clamping to prevent the anti-skid groove 65 from slipping on the safety belt. The angle of the clamping claw arm 561 on the clamping arm articulated seat 56 when in the non-expanded state is five degrees, and it will not be stuck. The expansion sleeve 54 is away from the rotation center of the driving lever 531, and the displacement generated is larger but the force is smaller.

[0045] The number of expansion push-pull arms 521 is two, and the two expansion push-pull arms 521 are symmetrically distributed with the central axis of the expansion linkage seat 52 as the symmetry axis. The other end of the driving lever 531 is hingedly connected to the hinge mounting seat 2, and the delay protrusion 542 is slidably connected to the delay slide 551. The number of clamping claw arms 561 on each clamping arm hinge seat 56 is two, and the two clamping claw arms 561 are symmetrically distributed with the central axis of the clamping arm hinge seat 56 as the symmetry axis. The number of the clamping arm hinge seat 56 is two, the number of the expansion clamping claws 57 is four, and the expansion limit column 571 is slidably connected to the inner surface of the clamping claw limiting groove 41, and the expansion push-pull arm 521 pushes the driving levers 531 on both sides. The driving levers 531 on both sides respectively drive the clamping arm hinge seats 56 on both sides to pull open the two expansion clamping claws 57 on each side, thereby clamping the two points of the safety belt and pulling the two points apart to realize the tensile strength test. Since each tensile test occurs in the inner mounting shell 4 and the length of each tensile test is also short, after the safety belt exceeds the tensile strength and breaks, it will not affect the surrounding environment due to its excessive size.

[0046] The clamping mechanism 6 of the clamping jaws includes a clamping sleeve 61, which is slidably connected to the outer surface of the driving lever 531, and the outer surface of the clamping sleeve 61 is rotatably connected to the clamping input arm 611, and the other end of the clamping input arm 611 is fixedly connected to a sliding seat 612, and the outer surface of the sliding seat 612 is fixedly connected to an embedded seat 613, and the outer surface of the embedded seat 613 is fixedly connected to a driven plate 62, and the outer surface of the expansion clamping jaw 57 is provided with a mounting groove 63, and the inner surface of the mounting groove 63 is fixedly connected to a clamping jaw limiting column 631, and the inner surface of the mounting groove 63 is slidably connected to an outer sliding frame 64, and the outer sliding frame 64 is fixedly connected to the outer surface of the outer sliding frame 64. An anti-skid groove 65 is fixedly connected to the outer surface. Through the setting of the clamping jaw clamping mechanism 6, during use, the clamping sleeve 61 is closest to the rotation center of the driving lever 531. The minimum displacement is used to push the anti-skid groove 65 to clamp the safety belt, and the force generated is the largest. In this way, the force for clamping the safety belt is greater than the force for stretching the safety belt, preventing the safety belt from slipping during the stretching process. The outer sliding frame 64 is installed in the mounting groove 63 on the expansion jaw 57, so as to follow the displacement of the expansion jaw 57. The clamping jaw limit column 631 increases the connection stability to prevent the outer sliding frame 64 from falling off from the mounting groove 63. The surface of the anti-skid groove 65 is serrated to increase friction.

[0047] There are two clamping sleeves 61, and the two clamping sleeves 61 are respectively slidably connected to the driving levers 531 on both sides, the embedded seat 613 is slidably connected to the inner surface of the inner mounting shell 4, the driven plate 62 is slidably connected to the outer surface of the expansion clamping jaw 57, the clamping jaw limit column 631 passes through the outer sliding frame 64 and is slidably connected to its inner wall, and the symmetrical clamping sleeves 61 simultaneously control the outer sliding frames 64 and the anti-slip grooves 65 on both sides.

[0048] The expansion limiting mechanism 7 includes an axis mounting seat 71, the axis mounting seat 71 is fixedly connected to the top surface of the inner mounting shell 4, the inner surface of the axis mounting seat 71 is rotatably connected to a rotating shaft 72, both ends of the rotating shaft 72 are fixedly connected to threaded shafts 721, the outer surface of the threaded shaft 721 is threadedly connected to an adjusting slider 73, the bottom surface of the adjusting slider 73 is slidably connected to an inner hinge rod 74, and the outer surface of the inner hinge rod 74 is slidably connected to an outer hinge rod 741. By setting the expansion limiting mechanism 7, during use, During the process, the expansion jaw 57 will pull the inner hinged rod 74 and the outer hinged rod 741 as it moves to both sides until the ends of the inner hinged rod 74 and the outer hinged rod 741 are blocked by the adjustment slider 73 and cannot be pulled further. The larger the spacing of the adjustment slider 73 and the closer it is to both sides, the larger the maximum angle that the inner hinged rod 74 and the outer hinged rod 741 can maintain, and the expansion jaw 57 can move a greater distance to both sides. Conversely, the smaller the angle, the smaller the movement distance of the expansion jaw 57, thereby controlling the strength of the stretched seat belt.

[0049] The threaded shafts 721 at both ends of the rotating shaft 72 have opposite rotation directions. The inner hinge rod 74 is rotatably connected to the top surface of the expansion clamp 57 , and the top surface of the outer hinge rod 741 is rotatably connected to the top surface of the expansion clamp 57 .

[0050] The equidistant conveying mechanism 8 includes a conveying pulley 81, which is rotatably connected to the outer surface of the pulley mounting seat 21, and a driving pulley 82 is fixedly connected to the outer surface of the conveying pulley 81. The outer surface of the driving pulley 82 is sleeved with a connecting belt 821, and the other end of the connecting belt 821 is sleeved with an intermediate pulley 822. The outer surface of the pulley mounting seat 21 is rotatably connected to a meshing gear 83, and the inner surface of the meshing gear 83 is provided with a ratchet groove 831. The other side surface of the conveying pulley 81 is fixedly connected to an output disk 84, and the inner surface of the output disk 84 is slidably connected to a spring mounting rod 841. The outer surface of the spring mounting rod 841 is sleeved with a ratchet reset spring 842, and one end of the spring mounting rod 841 is fixedly connected to a control ratchet 843. The outer surface of the meshing gear 83 is meshed with The active rack 85 has an outer surface fixedly connected with an adjusting screw 851, and a lifting seat 86 is slidably connected to the outer surface of the active rack 85. The bottom surface of the lifting seat 86 is rotatably connected with an adjusting knob 861. Through the setting of the equidistant conveying mechanism 8, during use, the active rack 85 is lifted and lowered to drive the meshing gear 83 to rotate. The active rack 85 will be separated from the active pulley 82 after being raised, and will contact the active pulley 82 after a certain delay after being lowered. In this way, the safety belt will be output only after the anti-skid groove 65 is released from the surface of the safety belt. Since the lifting height of the lifting seat 86 is fixed, the initial position of the active rack 85 is adjusted. The higher the active rack 85 is, the less the meshing area with the meshing gear 83 is, so as to realize the control of the rotation angle of the conveying pulley 81 each time, thereby changing the length of the output safety belt.

[0051] There are two conveyor pulleys 81, and the two conveyor pulleys 81 are symmetrically distributed with the central axis of the device base 1 as the symmetry axis. There are two driving pulleys 82 and two intermediate pulleys 822, and the two driving pulleys 82 and the two intermediate pulleys 822 are symmetrically distributed with the central axis of the device base 1 as the symmetry axis. The driving pulleys 82 and the intermediate pulleys 822 are connected by a connecting belt 821, and the connecting belt 821 runs through the device base 1 and is slidably connected to the inner wall of the device. There is one meshing gear 83, and there is one output disk 84. The control pawl 843 is slidably connected to the inner surface of the output disk 84. There are six control pawls 843, and the six control pawls 843 are distributed in a ring around the center of the output disk 84. The control pawl 843 meshes with the ratchet groove 831. The lifting seat 86 is fixedly connected to the top surface of the expansion linkage seat 52, and the adjusting knob 861 is threadedly connected to the adjusting screw 851.

[0052] In this embodiment, Figure 1 As shown, the device base 1 and the inner mounting shell 4 are used to install and protect other components, provide installation positions and activity space, and the driving cylinder 31 needs a higher initial height to drive the expansion linkage seat 52 to have a longer moving path, and is installed at a higher position through the cylinder support frame 3;

[0053] In this embodiment, Figure 2 , Figure 3 As shown, when the expansion linkage seat 52 is lifted or lowered, it pushes and pulls the expansion push-pull arms 521 on both sides, thereby changing the included angle of the expansion push-pull arms 521, thereby pushing or pulling the push-pull hinged housing 53 to drive the driving lever 531 to rotate;

[0054] In this embodiment, Figure 4 As shown, the sliding sleeves at different positions are driven to move by the lever principle, thereby adjusting the moving distance of the sliding sleeve and the strength of the thrust, and the clamping sliding sleeve 61 and the expansion sliding sleeve 54 can slide on the driving lever 531 to adapt to the rotation of the driving lever 531, and will not be brought to a high place, thereby maintaining the height but rotating;

[0055] In this embodiment, Figure 5 As shown, the expansion input rod 541 drives the delay protrusion 542 to slide in the delay slot 551, and only when it contacts the other side of the delay slot 551 will it continue to push the expansion output rod 55 to achieve delay;

[0056] In this embodiment, Figure 6 , Figure 7As shown, the clamping sleeve 61 pushes the clamping input arm 611 to drive the sliding seat 612 and the embedded seat 613 to move inward, and pushes the driven plate 62 to move on the expansion jaw 57. The outer sliding frame 64 is installed in the installation groove 63 on the expansion jaw 57, so as to follow the displacement of the expansion jaw 57;

[0057] In this embodiment, Figure 8 The expansion limiting mechanism 7 shown is installed on the top of the inner mounting shell 4 and is used in conjunction with the expansion clamping claw 57;

[0058] In this embodiment, Fig. 9 , Fig.10 As shown, the expansion jaws 57 will pull the inner hinge rod 74 and the outer hinge rod 741 in the process of moving to both sides, until the ends of the inner hinge rod 74 and the outer hinge rod 741 are blocked by the adjustment slider 73 and cannot be pulled further. The larger the spacing of the adjustment slider 73 and the closer it is to both sides, the larger the maximum angle that the inner hinge rod 74 and the outer hinge rod 741 can maintain.

[0059] In this embodiment, Figure 1 , Fig.11 As shown, the driving cylinder 31 controls the states of the clamping jaw expansion mechanism 5, the clamping jaw clamping mechanism 6 and the expansion limiting mechanism 7 at different extreme positions;

[0060] In this embodiment, Fig.12 As shown, the active rack 85 on the equidistant conveying mechanism 8 is driven by the expansion linkage seat 52 of the clamping claw expansion mechanism 5 to achieve lifting;

[0061] In this embodiment, Fig.13 As shown, by rotating the adjusting knob 861, the adjusting screw rod 851 is raised or lowered, thereby changing the height of the active rack 85;

[0062] In this embodiment, Fig.14 , Fig.15 As shown, the one-way rotation of the output disc 84 is achieved through the action of the ratchet pawl in the meshing gear 83, preventing the conveyor pulley 81 from turning over and causing the safety belt to be conveyed in the reverse direction.

[0063] A method for using a safety belt tension testing device comprises the following steps:

[0064] S1. The two ends of the safety belt to be tested are respectively rolled up on the conveyor pulleys 81 on both sides. In the initial state, the driving cylinder 31 is extended to the bottom, the four expansion jaws 57 are in the middle position, and the safety belt passes between the expansion jaws 57 on both sides;

[0065] S2, start the driving cylinder 31 to drive the cylinder output shaft 51 to rise, pull the expansion push-pull arms 521 on both sides through the expansion linkage seat 52 to reduce its angle, and pull the driving lever 531 through the push-pull hinged shell 53, the driving lever 531 gradually returns to the state of being inclined to both sides, and pushes the expansion sleeve 54 and the clamping sleeve 61 respectively during the return process. Since the expansion sleeve 54 and the clamping sleeve 61 can slide on the driving lever 531, they can adapt to the rotation angle of the driving lever 531, and the height remains unchanged. The expansion sleeve 54 pushes the expansion input rod 541 inward, and the expansion input rod 541 drives the delay protrusion 542 to slide in the delay slide groove 551. When it contacts the other side of the delay slide groove 551, it will continue to push the expansion output rod 55 to achieve delay. The expansion output rod 55 pushes the clamp arm hinge seat 56 to make it close to the inner mounting shell 4, and pushes the clamping claw arm 561 to both sides, driving the expansion clamping claw 5 7 is pushed to both sides. Due to the limitation of the expansion limit column 571 and the clamping jaw limit groove 41, the expansion clamping jaw 57 realizes direct movement to both sides. The clamping sleeve 61 pushes the clamping input arm 611 to drive the sliding seat 612 and the embedded seat 613 to move inward, and pushes the driven plate 62 to move on the expansion clamping jaw 57. The driven plate 62 then pushes the outer sliding frame 64 and the anti-skid groove 65 to clamp the inner safety belt. In this way, only the driving lever 531 needs to be pulled to drive the anti-skid groove 65 to clamp the safety belt at the same time, and the expansion clamping jaw 57 is used to pull the clamped safety belt to both sides, so as to detect the tensile strength. The expansion sleeve 54 and the clamping sleeve 61 are at different distances from the rotation center on the driving lever 531. The expansion sleeve 54 is farther away and has a larger moving distance for pulling the expansion safety belt. The clamping sleeve 61 has a smaller moving distance and generates a larger force, which is used to clamp the safety belt on both sides. In addition, there is a delay in stretching and expansion, and the safety belt will be clamped first and then stretched and expanded.

[0066] S3, when the driving cylinder 31 drives the cylinder output shaft 51 to rise, the expansion linkage seat 52 will drive the lifting seat 86 and the active rack 85 to rise, and the active rack 85 drives the meshing gear 83 to rotate, but at this time, the ratchet groove 831 and the control pawl 843 rotate in opposite directions, and the arc surface of the ratchet groove 831 contacts the control pawl 843, pressing the control pawl 843 into the interior of the output disk 84, which will not play a rotating role. When the driving cylinder 31 drives the cylinder output shaft 51 to descend, it means that the tensile strength test is completed, the expansion linkage seat 52 will drive the lifting seat 86 and the active rack 85 to descend, the anti-skid groove 65 is loosened and no longer clamps the safety belt, and the expansion jaw 5 7 is also retracted, and the active rack 85 descends for a period of time and contacts the meshing gear 83 to generate reverse rotation. At this time, the ratchet groove 831 and the control pawl 843 have the same rotation direction, and the other side of the ratchet groove 831 contacts the control pawl 843, and the control pawl 843 is no longer pressed in but driven to rotate. The conveyor pulley 81 rotates and transmits the rotation to the conveyor pulley 81 on the other side through the driving pulley 82, the intermediate pulley 822, and the connecting belt 821. The conveyor pulleys 81 on both sides rotate together and convey the conveyor belt for a distance for the next inspection. In this way, the safety belt is inspected in sections, the inspection range is increased, and the defective sections can be directly located.

[0067] S4. Adjust the tensile strength and length of each test. Rotate the rotating shaft 72 and drive the threaded shafts 721 on both sides to rotate at the same time. The threaded shafts 721 on both sides rotate in the same direction but in opposite directions. The moving directions of the adjusting sliders 73 are opposite, and they will move inward or outward at the same time, thereby changing the position of the adjusting sliders 73 on the shaft mounting seat 71. During the test, when the expansion jaws 57 on both sides are pulled apart, the inner hinged rod 74 and the outer hinged rod 741 will be pulled apart until the ends of the inner hinged rod 74 and the outer hinged rod 741 contact the bottom of the adjusting slider 73. At this time, the position of the adjusting slider 73 is fixed. The connecting rod 741 cannot be further pulled apart, the expansion jaws 57 cannot continue to expand to both sides, and the driving cylinder 31 cannot continue to pull, so as to adjust the tensile strength of each test. The telescopic length of the driving cylinder 31 is controlled by the stretching spacing of the expansion jaws 57, and the lifting height of the active rack 85 is controlled at the same time. The length of the conveyor belt each time corresponds to the strength of the test. The higher the strength, the longer the length of the safety belt each time. However, the adjusting knob 861 can be turned to raise and lower the adjusting screw 851, thereby changing the height of the active rack 85, thereby changing the meshing interval of the active rack 85 with the meshing gear 83 when it is raised and lowered, and the length of the conveyor belt each time can be manually adjusted.

[0068] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A safety belt tension test device, comprising a device base (1), characterized in that: The top surface of the device base (1) is fixedly connected to a hinged mounting seat (2), the top surface of the device base (1) is fixedly connected to a pulley mounting seat (21), the top surface of the device base (1) is fixedly connected to a cylinder support frame (3), the inner side surface of the cylinder support frame (3) is fixedly connected to a driving cylinder (31), the top surface of the device base (1) is fixedly connected to an inner mounting shell (4), the top surface of the inner mounting shell (4) is provided with a clamping jaw limiting groove (41), the outer side surface of the inner mounting shell (4) is provided with a belt passing groove (42), the output end of the driving cylinder (31) is provided with a clamping jaw expansion mechanism (5), the outer side surface of the clamping jaw expansion mechanism (5) is provided with a clamping jaw clamping mechanism (6), the top surface of the inner mounting shell (4) is provided with an expansion limiting mechanism (7), and the top surface of the pulley mounting seat (21) is provided with an equidistant conveying mechanism (8); The clamping jaw expansion mechanism (5) comprises a cylinder output shaft (51), the bottom surface of the cylinder output shaft (51) is fixedly connected to an expansion linkage seat (52), the inner surface of the expansion linkage seat (52) is hingedly connected to an expansion push-pull arm (521), one end of the expansion push-pull arm (521) is hingedly connected to a push-pull hinge shell (53), the outer surface of the push-pull hinge shell (53) is fixedly connected to a driving lever (531), the outer surface of the driving lever (531) is slidably connected to an expansion sleeve (54), and the outer surface of the expansion sleeve (54) is rotatably connected to an expansion input rod (541), The outer surface of the expansion input rod (541) is fixedly connected with a delay protrusion (542), the outer surface of the expansion input rod (541) is slidably connected with an expansion output rod (55), the outer surface of the expansion output rod (55) is provided with a delay slide groove (551), the other end of the expansion output rod (55) is fixedly connected with a clamp arm hinge seat (56), the inner surface of the clamp arm hinge seat (56) is hingedly connected with a clamp arm (561), the other end of the clamp arm (561) is hingedly connected with an expansion clamp (57), and the bottom surface of the expansion clamp (57) is fixedly connected with an expansion limit column (571).

2. A safety belt tension test device according to claim 1, characterized in that: The number of the articulated mounting seats (2) is two, and the two articulated mounting seats (2) are symmetrically distributed with the central axis of the device base (1) as the symmetry axis; the number of the pulley mounting seats (21) is two, and the two pulley mounting seats (21) are symmetrically distributed with the central axis of the device base (1) as the symmetry axis; the number of the inner mounting shells (4) is two, and the two inner mounting shells (4) are symmetrically distributed with the central axis of the rotating shaft shell as the symmetry axis.

3. A safety belt tension test device according to claim 1, characterized in that: The number of the expansion push-pull arms (521) is two, and the two expansion push-pull arms (521) are symmetrically distributed with the central axis of the expansion linkage seat (52) as the symmetry axis. The other end of the driving lever (531) is hingedly connected to the hinged mounting seat (2). The delay protrusion (542) is slidably connected to the delay slide groove (551). The number of the clamping claw arms (561) on each clamping arm hinge seat (56) is two, and the two clamping claw arms (561) are symmetrically distributed with the central axis of the clamping arm hinge seat (56) as the symmetry axis. The number of the clamping arm hinge seat (56) is two, and the number of the expansion clamping claws (57) is four. The expansion limiting column (571) is slidably connected to the inner surface of the clamping claw limiting groove (41).

4. A safety belt tension test device according to claim 1, characterized in that: The clamping mechanism (6) of the clamping jaws comprises a clamping sleeve (61), the clamping sleeve (61) is slidably connected to the outer surface of the driving lever (531), the outer surface of the clamping sleeve (61) is rotatably connected to a clamping input arm (611), the other end of the clamping input arm (611) is fixedly connected to a sliding seat (612), the outer surface of the sliding seat (612) is fixedly connected to an embedding seat (613), the outer surface of the embedding seat (613) is fixedly connected to a driven plate (62), the outer surface of the expansion clamping jaw (57) is provided with a mounting groove (63), the inner surface of the mounting groove (63) is fixedly connected to a clamping jaw limiting column (631), the inner surface of the mounting groove (63) is slidably connected to an outer sliding frame (64), and the outer surface of the outer sliding frame (64) is fixedly connected to an anti-slip groove (65).

5. A safety belt tension test device according to claim 4, characterized in that: There are two clamping sleeves (61), and the two clamping sleeves (61) are respectively slidably connected to the driving levers (531) on both sides, the embedded seat (613) is slidably connected to the inner surface of the inner mounting shell (4), the driven plate (62) is slidably connected to the outer surface of the expansion clamping claw (57), and the clamping claw limiting column (631) passes through the outer sliding frame (64) and is slidably connected to its inner wall.

6. A safety belt tension test device according to claim 1, characterized in that: The expansion limiting mechanism (7) comprises an axis mounting seat (71), the axis mounting seat (71) is fixedly connected to the top surface of the inner mounting shell (4), the inner surface of the axis mounting seat (71) is rotatably connected to a rotating shaft (72), both ends of the rotating shaft (72) are fixedly connected to threaded shafts (721), the outer surface of the threaded shaft (721) is threadedly connected to an adjusting slider (73), the bottom surface of the adjusting slider (73) is slidably connected to an inner hinged rod (74), and the outer surface of the inner hinged rod (74) is slidably connected to an outer hinged rod (741).

7. A safety belt tension test device according to claim 6, characterized in that: The threaded shafts (721) at both ends of the rotating shaft (72) have opposite rotation directions, the inner hinged rod (74) is rotationally connected to the top surface of the expansion clamp (57), and the top surface of the outer hinged rod (741) is rotationally connected to the top surface of the expansion clamp (57).

8. A safety belt tension test device according to claim 1, characterized in that: The equidistant conveying mechanism (8) comprises a conveying pulley (81), the conveying pulley (81) is rotatably connected to the outer surface of a pulley mounting seat (21), the outer surface of the conveying pulley (81) is fixedly connected to a driving pulley (82), the outer surface of the driving pulley (82) is sleeved with a connecting belt (821), the other end of the connecting belt (821) is sleeved with an intermediate pulley (822), the outer surface of the pulley mounting seat (21) is rotatably connected to a meshing gear (83), the inner surface of the meshing gear (83) is provided with a ratchet groove (831), and the other side surface of the conveying pulley (81) is fixedly connected to An output disk (84) is provided, the inner surface of the output disk (84) is slidably connected to a spring mounting rod (841), the outer surface of the spring mounting rod (841) is sleeved with a ratchet return spring (842), one end of the spring mounting rod (841) is fixedly connected to a control ratchet (843), the outer surface of the meshing gear (83) is meshed with an active rack (85), the outer surface of the active rack (85) is fixedly connected to an adjusting screw rod (851), the outer surface of the active rack (85) is slidably connected to a lifting seat (86), and the bottom surface of the lifting seat (86) is rotatably connected to an adjusting knob (861).

9. A safety belt tension test device according to claim 8, characterized in that: The number of the conveyor pulleys (81) is two, and the two conveyor pulleys (81) are symmetrically distributed with the central axis of the device base (1) as the symmetry axis; the number of the driving pulleys (82) and the intermediate pulleys (822) are both two, and the two driving pulleys (82) and the two intermediate pulleys (822) are symmetrically distributed with the central axis of the device base (1) as the symmetry axis; the driving pulleys (82) and the intermediate pulleys (822) are connected by a connecting belt (821), and the connecting belt (821) passes through the device base (1) and is slidably connected to the inner wall of the device base (1). The number of the meshing gear (83) is one, the number of the output disk (84) is one, the control pawl (843) is slidably connected to the inner surface of the output disk (84), the number of the control pawls (843) is six, and the six control pawls (843) are distributed in a ring shape around the center of the output disk (84), the control pawls (843) are meshed with the ratchet groove (831), the lifting seat (86) is fixedly connected to the top surface of the expansion linkage seat (52), and the adjusting knob (861) is threadedly connected to the adjusting screw rod (851).

10. A method for using a seat belt tension test device, using the seat belt tension test device according to any one of claims 1 to 9, characterized in that: The steps include: S1. The two ends of the safety belt to be tested are respectively rolled up on the conveyor belt wheels (81) on both sides. In the initial state, the driving cylinder (31) is extended to the bottom, the four expansion clamps (57) are in the middle position, and the safety belt passes between the expansion clamps (57) on both sides; S2, start the driving cylinder (31) to drive the cylinder output shaft (51) to rise, pull the expansion push-pull arms (521) on both sides through the expansion linkage seat (52) to reduce their angles, and pull the driving lever (531) through the push-pull hinged housing (53), so that the driving lever (531) gradually returns to the normal state from the state of being inclined to both sides, and pushes the expansion sliding sleeve (54) and the clamping sliding sleeve (61) respectively during the process of returning to the normal state, because the expansion sliding sleeve (54) and the clamping sliding sleeve (61) can slide on the driving lever (531) due to the pushing. Thus, the height remains unchanged according to the rotation angle of the driving lever (531). The expansion sleeve (54) pushes the expansion input rod (541) inwardly. The expansion input rod (541) drives the delay protrusion (542) to slide in the delay slide groove (551). When the delay protrusion (542) contacts the other side of the delay slide groove (551), the expansion output rod (55) continues to push the expansion output rod (55) to achieve delay. The expansion output rod (55) pushes the clamp arm hinge seat (56) to make it close to the inner mounting shell (4), and pushes the clamp arm (561) to both sides, driving the expansion The clamping jaw (57) is pushed open to both sides. Due to the limitation of the expansion limiting column (571) and the clamping jaw limiting groove (41), the expansion clamping jaw (57) can move straight to both sides. The clamping sleeve (61) pushes the clamping input arm (611) to drive the sliding seat (612) and the embedded seat (613) to move inwards, and pushes the driven plate (62) to move on the expansion clamping jaw (57). The driven plate (62) then pushes the outer sliding frame (64) and the anti-skid groove (65) to clamp the inner safety belt. In this way, the driving lever (531) can be pulled to simultaneously The anti-skid groove (65) is driven to clamp the safety belt, and the expansion clamping claw (57) is used to pull the clamped safety belt to both sides, so as to detect the tensile strength. The expansion sleeve (54) and the clamping sleeve (61) are at different distances from the rotation center on the driving lever (531). The expansion sleeve (54) is farther away and has a larger moving distance for pulling and expanding the safety belt. The clamping sleeve (61) has a smaller moving distance and generates a larger force, which is used to clamp the safety belt on both sides. In addition, there is a delay in the stretching and expansion, and the safety belt will be clamped first and then stretched and expanded. S3, when the driving cylinder (31) drives the cylinder output shaft (51) to rise, the expansion linkage seat (52) drives the lifting seat (86) and the active rack (85) to rise, and the active rack (85) drives the meshing gear (83) to rotate. However, at this time, the rotation directions of the ratchet groove (831) and the control pawl (843) are opposite, and the arc surface of the ratchet groove (831) contacts the control pawl (843), pressing the control pawl (843) into the inside of the output disk (84), and will not play a rotating role. When the driving cylinder (31) drives the cylinder output shaft (51) to descend, it means that the tensile strength test is completed, the expansion linkage seat (52) drives the lifting seat (86) and the active rack (85) to descend, and the anti-skid groove (65) is loosened and no longer clamps the safety belt. The expansion clamp (57) is also retracted, and the active rack (85) is lowered for a period of time and then contacts the meshing gear (83) to generate reverse rotation. At this time, the ratchet groove (831) and the control ratchet pawl (843) have the same rotation direction, and the other side of the ratchet groove (831) contacts the control ratchet pawl (843), and the control ratchet pawl (843) is no longer pressed in but driven to rotate. The conveyor pulley (81) rotates and transmits the rotation to the conveyor pulley (81) on the other side through the driving pulley (82), the intermediate pulley (822), and the connecting belt (821). The conveyor pulleys (81) on both sides rotate at the same time and convey the conveyor belt for a distance for the next detection. In this way, the safety belt is detected in sections, the detection range is increased, and the defective sections can be directly located. S4. Adjust the tensile strength and the length of each test. Rotate the rotating shaft (72) to drive the threaded shafts (721) on both sides to rotate. The threaded shafts (721) on both sides rotate in the same direction but in opposite directions. Then the adjustment slider (73) moves in opposite directions and moves inward or outward at the same time, thereby changing the position of the adjustment slider (73) on the shaft mounting seat (71). During the test, when the expansion jaws (57) on both sides are pulled apart, the inner hinge rod (74) and the outer hinge rod (741) are pulled apart until the ends of the inner hinge rod (74) and the outer hinge rod (741) contact the bottom of the adjustment slider (73). At this time, the position of the adjustment slider (73) is fixed. The outer hinge rod (741) cannot be further pulled apart, the expansion jaws (57) cannot be further expanded to both sides, and the driving cylinder (31) cannot be further pulled, so as to adjust the tensile strength of each test. The telescopic length of the driving cylinder (31) is controlled by the stretching spacing of the expansion jaws (57), and the lifting height of the active rack (85) is controlled at the same time. The length of the conveying belt each time corresponds to the strength of the test. The higher the strength, the longer the length of the test belt each time. However, the adjusting knob (861) can be turned to raise and lower the adjusting screw rod (851), thereby changing the height of the active rack (85), thereby changing the meshing interval between the active rack (85) and the meshing gear (83) when the active rack (85) is raised and lowered, and the length of the conveying belt each time can be manually adjusted.

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