Helmet fixing strap toughness detection device

Abstract

The present invention relates to the field of testing equipment, and in particular to a helmet strap toughness testing device. The purpose of the present invention is to provide a helmet strap toughness testing device that can fix the helmet strap on a clamp during testing. A helmet strap toughness testing device includes a support base and an electric push rod, the electric push rod is installed on the left side of the support base; a sliding frame, the sliding frame is installed on the right side of the telescopic rod of the electric push rod, and the sliding frame is slidably connected to the support base; a first support frame, the upper side of the left part of the support base and the upper side of the sliding frame are both connected to the first support frame. The present invention clamps the helmet strap at two places, the first support frame and the upper clamp and the second support frame and the sliding block, and can wind and fix the end of the helmet strap, thereby improving the fixation of the helmet strap by the device during testing, and achieving the effect of being able to fix the helmet strap on the clamp during testing.

Description

Technical Field

[0001] The present invention relates to the field of detection equipment, and in particular to a helmet fixing strap toughness detection device. Background Art

[0002] In motorcycle driving, safety is one of the most important indicators, especially the helmet worn by the rider, which needs to protect the head, the most important part of the human body. The helmet's fixing strap needs to be strong enough to effectively protect the rider's head in a collision. Therefore, it is necessary to test the toughness of the helmet fixing strap. The common testing method is to fix the helmet fixing strap on a tension testing device and test the toughness by pulling the helmet fixing strap apart. The existing toughness testing device usually clamps the two sides of the fixing strap to be tested, pulls the fixing strap apart to a certain distance, observes its changes, and thus measures whether the toughness is qualified. During the test, since the helmet fixing strap is mostly made of leather or fiber material, it is easy to fall off the fixture of the testing device during the test, causing the test to fail, which increases the difficulty of the test. After the test, people need to manually remove the helmet fixing strap from the testing device to prevent the helmet fixing strap from being damaged. Therefore, a helmet fixing strap toughness testing device that fixes the helmet fixing strap on the fixture is needed to solve the existing problem. Summary of the Invention

[0003] In order to overcome the disadvantage of the existing detection device that the helmet fixing strap is easily detached from the clamp of the detection device during detection, the purpose of the present invention is to provide a helmet fixing strap toughness detection device that can fix the helmet fixing strap on the clamp during detection.

[0004] A helmet fixing strap toughness detection device, comprising:

[0005] Support base and electric push rod, the electric push rod is installed on the left side of the support base;

[0006] Sliding frame: a sliding frame is installed on the right side of the telescopic rod of the electric push rod, and the sliding frame is slidably connected to the support base;

[0007] A first support frame is connected to the upper left side of the support base and the upper side of the sliding frame;

[0008] Adjusting screws: the upper side of the first support frame is threadedly connected with adjusting screws;

[0009] An upper clamping piece, wherein the lower end of the adjusting screw passes through the upper wall of the first support frame, and the bottom end of the adjusting screw is rotatably connected to the upper clamping piece for clamping the helmet fixing strap;

[0010] Reinforcement mechanism: a reinforcement mechanism is provided on the outer side of the first support frame;

[0011] Release mechanism: a release mechanism is provided on the upper right side of the support base.

[0012] Furthermore, the reinforcement mechanism includes:

[0013] A second support frame, wherein the lower portion of the first support frame is connected to the second support frame;

[0014] Sliding rod, the front and rear parts of the second support frame are both slidably connected with sliding rods;

[0015] Sliding blocks, wherein the sliding blocks are connected between the sliding bars on the same side, and the sliding blocks are all located outside the second supporting frame;

[0016] A spring is wound around the slide bar, and both ends of the spring are connected to the slide bar and the second support frame respectively;

[0017] Connecting rods, both the front and rear parts of the upper wall of the upper clamp are connected with connecting rods;

[0018] The bayonet pin and the outer end of the connecting rod are slidably connected with the bayonet pin, and a small hole is opened on the upper outer side of the slide rod. The bayonet pins pass through the second support frame and are inserted into the small hole on the outer side of the slide rod. The sliding block is pulled outward, and the sliding block drives the slide rod to move outward and compresses the spring. The helmet fixing strap is placed on the second support frame and the sliding block, and the sliding block is released. The helmet fixing strap is clamped by the reset action of the spring.

[0019] Furthermore, the release mechanism includes:

[0020] A first rack is slidably connected to the upper right side of the support base, and the first rack is symmetrically positioned;

[0021] A crescent cam, wherein both the front and rear parts of the second support frame are rotatably connected to the crescent cam, and the bayonet pin is in contact with the crescent cam;

[0022] A second rack is connected to the upper side of the first rack at the rear side;

[0023] Gear, a gear is connected to the upper side of the adjusting screw, the second rack and the gear are at the same height, the second support frame moves to the right, the crescent cam engages with the first rack, the crescent cam rotates, pushes the pin upward, so that the pin no longer blocks the slide rod, and the adjusting screw and the gear move to the right and engage with the second rack, so that the adjusting screw and the gear rotate, and the upper clip moves upward to release the helmet fixing strap.

[0024] Furthermore, a synchronization mechanism is included for controlling the adjustment screw and the sliding block to automatically loosen the helmet fixing strap, and the synchronization mechanism includes:

[0025] A slider is connected to the slide rod, and the outer end of the slider is slidably connected to the second support frame;

[0026] The wedge block is connected to the front and rear sides of the upper clamping piece. The slider contacts the upper side of the wedge block. The upper clamping piece drives the wedge block to move upward, and the wedge block squeezes the slider outward. The slider drives the slide rod and the slide block to move outward to release the helmet fixing strap.

[0027] Furthermore, an adjusting mechanism for adjusting the position of the release mechanism is included, and the adjusting mechanism includes:

[0028] A threaded sleeve is connected between the first racks;

[0029] The screw rod is threadedly connected to the threaded sleeve, and the left end of the screw rod is rotatably connected to the support base;

[0030] The handwheel and the right end of the screw rod pass through the threaded sleeve and are connected with the handwheel. When the handwheel is turned, the handwheel drives the screw rod to rotate, and the screw rod drives the threaded sleeve to move left and right.

[0031] Furthermore, a protective mechanism for preventing the helmet fixing strap from collapsing is included, and the protective mechanism includes:

[0032] A sliding sleeve is evenly and slidingly connected to the left portion of the upper side of the support base, the sliding sleeve on the left side is connected to the first support frame on the left side, and the sliding sleeve on the right side is connected to the first support frame on the right side;

[0033] The protective frame and the upper side of the sliding sleeve are connected to the protective frame;

[0034] The connecting rod and the sliding sleeve are both rotatably connected with connecting rods, and the connecting rods are rotatably connected. When the electric push rod is started, the electric push rod drives the connecting rod to move to the right, and the connecting rod drives the protective frame and the sliding sleeve to move to the right.

[0035] Furthermore, an expansion mechanism for further fixing the helmet strap is included, and the expansion mechanism includes:

[0036] Connecting frame, the upper and lower sides of the sliding block are connected to the connecting frame;

[0037] The rotating plate and the connecting frame are rotatably connected to the rotating plate via a rotating shaft;

[0038] Torsion springs are wound around the rotating shafts, and both ends of the torsion springs are connected to the rotating plate and the connecting frame respectively. The sliding block is pulled outward, and the sliding block drives the connecting frame and the rotating plate to move outward. The helmet fixing belt is placed between the sliding block and the second support frame, and the sliding block is released. Under the resetting action of the spring, the connecting frame and the rotating plate are driven to reset, and the rotating plate is pressed against the second support frame, and the torsion spring is twisted under the force.

[0039] Furthermore, the bottom side of the upper clip is made of rubber material to increase friction.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] 1. The present invention clamps the helmet fixing strap by means of the first support frame and the upper clamping piece and the second support frame and the sliding block, and can wind and fix the end of the helmet fixing strap, thereby improving the fixation of the helmet fixing strap by the device during testing, and achieving the effect of being able to fix the helmet fixing strap to the clamp during testing;

[0042] 2. The present invention squeezes the slider by the wedge block to move the slider, thereby simultaneously opening the upper clip and the sliding block, allowing people to place the helmet fixing strap on them, which is convenient for people to operate;

[0043] 3. The present invention rotates the hand wheel to drive the screw to rotate, thereby moving the first rack, thereby achieving the effect of adjusting the release distance of the helmet fixing strap during testing according to the material;

[0044] 4. The present invention prevents the helmet fixing strap from collapsing and hitting the inspector's hands by placing the helmet fixing strap inside the protective frame, thereby improving safety.

[0045] 5. The present invention presses the helmet fixing strap against the outer wall of the second support frame through the rotating plate, so that the helmet fixing strap is spread flat on the outer wall of the second support frame, thereby increasing the contact area between the helmet fixing strap and the second support frame, increasing the friction between the helmet fixing strap and the second support frame, and achieving the effect of further clamping the two ends of the helmet fixing strap. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0047] Figure 2 It is a partial three-dimensional structural schematic diagram of the present invention.

[0048] Figure 3 It is a schematic diagram of the three-dimensional structure of the reinforcement mechanism of the present invention.

[0049] Figure 4 It is a schematic diagram of the cross-sectional three-dimensional structure of the reinforcement mechanism of the present invention.

[0050] Figure 5 It is a schematic diagram of the three-dimensional structure of the sliding block and the sliding rod of the present invention.

[0051] Figure 6 It is an enlarged view of point A of the present invention.

[0052] Figure 7 It is a schematic diagram of the three-dimensional structure of the release mechanism of the present invention.

[0053] Figure 8 It is an enlarged view of B of the present invention.

[0054] Figure 9 It is a schematic diagram of the three-dimensional structure of the synchronization mechanism of the present invention.

[0055] Figure 10 It is an enlarged view of location C of the present invention.

[0056] Figure 11 It is a schematic diagram of the three-dimensional structure of the adjustment mechanism of the present invention.

[0057] Figure 12 It is a schematic diagram of the three-dimensional structure of the protection mechanism of the present invention.

[0058] Figure 13 It is a schematic diagram of the three-dimensional structure of the expansion mechanism of the present invention.

[0059] In the accompanying drawings: 1-support base, 2-electric push rod, 3-first support frame, 4-sliding frame, 5-upper clamp, 6-adjusting screw, 7-reinforcement mechanism, 71-second support frame, 72-sliding block, 73-sliding rod, 74-spring, 75-connecting rod, 76-pin, 8-release mechanism, 81-first rack, 82-semi-moon cam, 83-second rack, 84-gear, 9-synchronizing mechanism, 91-slider, 92-wedge block, 10-adjusting mechanism, 101-threaded sleeve, 102-screw, 103-handwheel, 11-protection mechanism, 111-sliding sleeve, 112-protection frame, 113-connecting rod, 12-expansion mechanism, 121-connecting frame, 122-rotating plate, 123-torsion spring. DETAILED DESCRIPTION

[0060] The above scheme is further described below with reference to specific examples. It should be understood that these examples are intended to illustrate the present application and are not intended to limit the scope of the present application. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer. The implementation conditions not specified are generally those used in routine experiments.

[0061] Example 1

[0062] A helmet fixing strap toughness detection device, such as Figures 1-8 As shown, it includes a support base 1, an electric push rod 2, a first support frame 3, a sliding frame 4, an upper clamp 5, an adjusting screw 6, a reinforcement mechanism 7, a release mechanism 8 and a synchronization mechanism 9. The electric push rod 2 is installed on the left side of the support base 1, and the sliding frame 4 is installed on the right side of the telescopic rod of the electric push rod 2. The sliding frame 4 is slidably connected to the support base 1. The upper side of the left part of the support base 1 and the upper side of the sliding frame 4 are both connected to the first support frame 3. The upper sides of the two first support frames 3 are both threadedly connected with an adjusting screw 6. The lower end of the adjusting screw 6 passes through the upper wall of the first support frame 3. The bottom end of the adjusting screw 6 is rotatably connected to the upper clamp 5 for clamping the helmet fixing strap. The bottom side of the upper clamp 5 is made of rubber to increase friction. Reinforcement mechanisms 7 are provided on the outside of the two first support frames 3, and a release mechanism 8 is provided on the upper right side of the support base 1.

[0063] like Figure 3-Figure 6 As shown, the reinforcement mechanism 7 includes a second support frame 71, a sliding block 72, a sliding rod 73, a spring 74, a connecting rod 75 and a pin 76. The second support frame 3 is welded to the lower part of the first support frame 3. There are two second support frames 71. The front and rear parts of the second support frame 71 are slidably connected to the sliding rod 73. There are four sliding rods 73. A sliding block 72 for clamping the helmet fixing strap is connected between the two sliding rods 73 on the same side. The sliding blocks 72 are both located on the outside of the second support frame 71. A spring 74 is wound on the sliding rod 73. Both ends of the spring 74 are respectively connected to the sliding rod 73 and the second support frame 71. The front and rear parts of the upper wall of the upper clip 5 are welded to the connecting rod 75. The outer ends of the connecting rod 75 are slidably connected to the pin 76. A small hole is opened on the upper outer side of the sliding rod 73, and the pin 76 passes through the second support frame 71 and is clamped into the small hole on the outer side of the sliding rod 73.

[0064] like Figure 7-Figure 8 As shown, the release mechanism 8 includes a first rack 81, a semi-moon cam 82, a second rack 83 and a gear 84. Two first racks 81 are slidably connected to the upper right side of the support base 1. The two first racks 81 are symmetrically positioned. The upper side of the first rack 81 located at the rear side is connected to the second rack 83 for rotating the adjusting screw 6. The upper side of the adjusting screw 6 is connected to the gear 84. The front and rear parts of the second support frame 71 are both connected to the semi-moon cam 82 through a key, and the latch 76 is in contact with the semi-moon cam 82.

[0065] When people need to test the toughness of the helmet fixing strap, first manually rotate the gear 84 on the adjusting screw 6, the gear 84 drives the adjusting screw 6 to rotate, and the height of the upper clamping piece 5 is adjusted by adjusting the screw 6, so that the upper clamping piece 5 moves upward, driving the latch 76 to move upward and slide out of the small hole on the slide bar 73, and then the two ends of the helmet fixing strap are respectively placed between the first support frame 3 and the upper clamping piece 5 on the left and right sides, and then the sliding block 72 is pulled outward, and the sliding block 72 drives the sliding bar 73 to move outward. At this time, the spring 74 is in a compressed state, and people can fix the helmet fixing strap between the second support frame 71 and the sliding block 72, and then release the sliding block. The upper clamping piece 5 and the first support frame 3 are connected to each other, and the upper clamping piece 5 and the first support frame 3 are connected to each other, so that the upper clamping piece 5 and the first support frame 3 can be clamped together. The bottom side of the upper clamping piece 5 is made of rubber, which can increase the friction with the helmet strap and clamp the helmet strap more tightly. Then the electric push rod 2 is started, and the telescopic rod of the electric push rod 2 extends to the right, driving the sliding frame 4 to move right, pulling the helmet strap open, and the telescopic rod of the electric push rod 2 drives the sliding frame 4 to move right. The movable frame 4 moves the right end of the helmet fixing strap to the right end of the supporting base 1. At this time, the gear side of the crescent-toothed cam 82 on the second supporting frame 71 will mesh with the first rack 81. The first rack 81 drives the crescent-toothed cam 82 to rotate clockwise, causing the cam of the crescent-toothed cam 82 to rotate, pushing the latch 76 to move upward and slide out of the small hole on the slide bar 73, so that the latch 76 no longer blocks the slide bar 73, and at this time the gear 84 on the adjusting screw 6 meshes with the second rack 83 on the first rack 81, causing the adjusting screw 6 to rotate in the opposite direction, causing the upper clip 5 to move upward and loosen the helmet fixing strap. Since the helmet fixing strap is pulled apart at this time, when the upper clip 5 and the first supporting frame 3 are After the helmet strap is loosened, the end of the helmet strap will slide out from between the sliding block 72 and the second support frame 71 due to the resetting effect. At this time, people can identify whether the toughness of the helmet strap is qualified by observing whether the helmet strap has cracks. When the device is in use, the helmet strap is clamped by the first support frame 3 and the upper clamping piece 5 and the second support frame 71 and the sliding block 72, and the end of the helmet strap can be wound and fixed, which improves the fixation of the helmet strap by the device during testing. After testing, the right end of the helmet strap can be automatically released to prevent people from manually releasing the helmet strap from being bounced off their hands, making it easier for people to use.

[0066] Example 2

[0067] On the basis of Example 1, Figure 1 、 Figure 9 and Figure 10As shown, a synchronization mechanism 9 is also included, which includes a slider 91 and a wedge block 92. The slider 91 is connected to the slide bar 73, and the outer side of the slider 91 is slidably connected to the second support frame 71. Wedge blocks 92 are welded on both the front and rear sides of the upper clamp 5, and the outer end of the slider 91 is in contact with the upper side of the wedge block 92.

[0068] When people turn the gear 84 on the adjusting screw 6 to drive the upper clamping piece 5 to move upward, the upper clamping piece 5 will drive the wedge block 92 to move upward, and the wedge block 92 squeezes the slider 91, causing the slider 91 to move outward, and the slider 91 drives the slide bar 73 and the sliding block 72 to move outward, causing the sliding block 72 to leave the outer wall of the second support frame 71. At this time, the spring 74 is in a compressed state, and people can pass the helmet fixing strap through the first support frame 3 and the upper clamping piece 5, and at the same time place the end of the helmet fixing strap between the second support frame 71 and the sliding block 72, and then rotate the gear 84 on the adjusting screw 6 in the opposite direction to cause the upper clamping piece 5 to move downward, and the upper clamping piece 5 drives the wedge block 92 to move downward, and no longer resists The slider 91 is held so that the spring 74 can be reset. The reset action of the spring 74 drives the slider 91 to reset, and the slider 91 drives the slide bar 73 and the slide block 72 to reset, so that the upper clamping piece 5 and the first support frame 3 can clamp the helmet fixing strap, and the end of the helmet fixing strap is wrapped around the second support frame 71 and clamped by the slide block 72. When people turn the gear 84 on the adjusting screw 6, the upper clamping piece 5 is lifted and the slide block 72 is pushed outward at the same time. The helmet fixing strap can be placed without additionally pulling the slide piece outward. Then, the gear 84 on the adjusting screw 6 is reversed, and the upper clamping piece 5 and the slide block 72 can clamp the helmet fixing strap at the same time, which is convenient for people to operate.

[0069] like Figure 1 and Figure 11 As shown, it also includes an adjustment mechanism 10, which includes a threaded sleeve 101, a screw rod 102 and a handwheel 103. The threaded sleeve 101 is connected between the two first racks 81, and the screw rod 102 is threadedly connected inside the threaded sleeve 101. The left end of the screw rod 102 is rotatably connected to the support base 1, and the right end of the screw rod 102 passes through the threaded sleeve 101 and is welded with a handwheel 103 for rotating the screw rod 102.

[0070] When people test helmet straps made of different materials, since the toughness of the helmet straps is different, people can manually turn the hand wheel 103, and the rotation of the hand wheel 103 drives the screw rod 102 to rotate. The rotation of the screw rod 102 causes the threaded sleeve 101 to move, and the threaded sleeve 101 drives the front and rear first racks 81 to move, so that people can adjust the distance between the second support frame 71 and the first rack 81, thereby adjusting the distance that the right end of the helmet strap is pulled apart, thereby achieving the effect of adjusting the release distance of the helmet strap during testing according to the material.

[0071] like Figure 1 and Figure 12 As shown, a protective mechanism 11 is also included. The protective mechanism 11 includes a sliding sleeve 111, a protective frame 112 and a connecting rod 113. The left upper part of the support base 1 is evenly and slidingly connected with the sliding sleeve 111. The number of the sliding sleeves 111 is ten. The sliding sleeve 111 on the left is connected to the first support frame 3 on the left, and the sliding sleeve 111 on the right is connected to the first support frame 3 on the right. A protective frame 112 is welded on the upper side of the sliding sleeve 111 to prevent the residue of the helmet fixing belt from splashing out. The sliding sleeve 111 is rotatably connected to the connecting rod 113, and the connecting rods 113 are connected by pins.

[0072] When people pull out the helmet strap to test its toughness, the helmet strap may be broken due to being pulled too far. People can pass the helmet strap through the protective frame 112 and then clamp it between the first support frame 3 and the upper clamping piece 5 on both sides, and then start the electric push rod 2. The electric push rod 2 drives the connecting rod 113 to move to the right, and the connecting rod 113 drives the protective frame 112 and the sliding sleeve 111 to move to the right, and the distance between the protective frames 112 is equal. After the test is completed, the electric push rod 2 is closed and the helmet strap is taken out from between the upper clamping piece 5 and the first support frame 3 on both sides. This achieves the effect of preventing the broken helmet strap from hitting the tester when the helmet strap is broken due to unqualified quality, thereby improving safety.

[0073] like Figure 1 and Figure 13 As shown, an expansion mechanism 12 is also included, and the expansion mechanism 12 includes a connecting frame 121, a rotating plate 122 and a torsion spring 123. The upper and lower sides of the sliding block 72 are connected to the connecting frame 121, and the connecting frame 121 is rotatably connected to the rotating plate 122 for supporting the helmet fixing strap through a rotating shaft. A torsion spring 123 is wound on the rotating shaft, and both ends of the torsion spring 123 are respectively connected to the rotating plate 122 and the connecting frame 121.

[0074] When people pull out sliding block 72, sliding block 72 will drive connecting frame 121 and rotating plate 122 to move outward, and people will put the helmet fixing belt between sliding block 72 and second support frame 71, then release sliding block 72, and sliding block 72 will be reset by the reset action of spring 74, and sliding block 72 will drive connecting frame 121 and rotating plate 122 to move inward, and rotating plate 122 will resist the second support frame 71. Rotating plate 122 is pushed inward by sliding block 72 and opens to the upper and lower sides, and at this time, torsion spring 123 is twisted by force, and the opened rotating plate 122 can make the helmet securely mounted on the head. The helmet fixing strap is spread flat on the outer wall of the second support frame 71, which increases the contact area between the helmet fixing strap and the second support frame 71, increases the friction between the helmet fixing strap and the second support frame 71, and further clamps the two ends of the helmet fixing strap. After the inspection is completed, people pull outward the sliding block 72, and the sliding block 72 moves outward, driving the rotating plate 122 to leave the second support frame 71, and the torsion spring 123 is reset. At this time, people can remove the helmet fixing strap from between the second support frame 71 and the sliding block 72, and finally loosen the sliding block 72, and the sliding block 72 is reset by the reset action of the spring 74.

[0075] The above-described embodiments merely represent preferred embodiments of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications, improvements, and substitutions without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A helmet fixing strap toughness detection device, characterized in that: Includes: A support base (1) and an electric push rod (2), wherein the electric push rod (2) is installed on the left side of the support base (1); A sliding frame (4) is installed on the right side of the telescopic rod of the electric push rod (2), and the sliding frame (4) is slidably connected to the support base (1); A first support frame (3), the upper left side of the support base (1) and the upper side of the sliding frame (4) are both connected to the first support frame (3); An adjusting screw (6) is threadedly connected to the upper side of the first support frame (3); an upper clamping piece (5) is provided, wherein the lower end of the adjusting screw (6) passes through the upper wall of the first support frame (3), and the lower end of the adjusting screw (6) is rotatably connected to the upper clamping piece (5) for clamping the helmet fixing strap; A reinforcement mechanism (7), wherein the outer side of the first support frame (3) is provided with a reinforcement mechanism (7); A release mechanism (8) is provided on the upper right side of the support base (1); The reinforcement mechanism (7) comprises: A second support frame (71), the lower portion of the first support frame (3) is connected to the second support frame (71); Sliding rod (73), the front and rear parts of the second support frame (71) are both slidably connected with the sliding rod (73); the sliding block (72), the sliding block (72) is connected between the sliding rods (73) located on the same side, and the sliding block (72) is located outside the second support frame (71); A spring (74) is wound around the slide bar (73), and two ends of the spring (74) are respectively connected to the slide bar (73) and the second support frame (71); The connecting rod (75) is connected to the front and rear parts of the upper wall of the upper clamping piece (5); the bayonet (76) is slidably connected to the outer end of the connecting rod (75); a small hole is opened on the upper outer side of the slide bar (73); the bayonet (76) passes through the second support frame (71) and is inserted into the small hole on the outer side of the slide bar (73); the sliding block (72) is pulled outward, the sliding block (72) drives the slide bar (73) to move outward, and compresses the spring (74), the helmet fixing belt is placed on the second support frame (71) and the sliding block (72), the sliding block (72) is released, and the helmet fixing belt is clamped by the reset effect of the spring (74).

2. A helmet fixing strap toughness detection device according to claim 1, characterized in that: The release mechanism (8) comprises: A first rack (81) is slidably connected to the upper right side of the support base (1), and the first rack (81) is symmetrically positioned; A half-moon cam (82), the front and rear parts of the second support frame (71) are both rotatably connected to the half-moon cam (82), and the bayonet (76) is in contact with the half-moon cam (82); A second rack (83), the second rack (83) being connected to the upper side of the first rack (81) at the rear side; The gear (84) is connected to the upper side of the adjusting screw (6), the second rack (83) and the gear (84) are at the same height, the second support frame (71) moves to the right, the crescent cam (82) engages with the first rack (81), the crescent cam (82) rotates, and the bayonet (76) is pushed upward, so that the bayonet (76) no longer blocks the slide bar (73), and the adjusting screw (6) and the gear (84) move to the right and engage with the second rack (83), so that the adjusting screw (6) and the gear (84) rotate, and the upper clip (5) moves upward to release the helmet fixing belt.

3. A helmet fixing strap toughness detection device according to claim 2, characterized in that: The invention also includes a synchronization mechanism (9) for controlling the adjustment screw (6) and the sliding block (72) to automatically loosen the helmet fixing belt. The synchronization mechanism (9) includes: A slider (91), the slider (91) is connected to the slide rod (73), and the outer end of the slider (91) is slidably connected to the second support frame (71); The wedge block (92) is connected to both the front and rear sides of the upper clamping piece (5), and the slider (91) contacts the upper side of the wedge block (92). The upper clamping piece (5) drives the wedge block (92) to move upward, and the wedge block (92) presses the slider (91) outward. The slider (91) drives the slide bar (73) and the slide block (72) to move outward to release the helmet fixing belt.

4. A helmet fixing strap toughness detection device according to claim 3, characterized in that: The device further comprises an adjusting mechanism (10) for adjusting the position of the release mechanism (8), wherein the adjusting mechanism (10) comprises: A threaded sleeve (101) is connected between the first rack (81); The screw rod (102) is threadedly connected to the threaded sleeve (101), and the left end of the screw rod (102) is rotatably connected to the support base (1); The right end of the screw rod (102) passes through the threaded sleeve (101) and is connected to the hand wheel (103). When the hand wheel (103) is rotated, the hand wheel (103) drives the screw rod (102) to rotate, and the screw rod (102) drives the threaded sleeve (101) to move left and right.

5. A helmet strap toughness detection device according to claim 1, characterized in that: The helmet also includes a protective mechanism (11) for preventing the helmet fixing belt from collapsing. The protective mechanism (11) includes: A sliding sleeve (111) is evenly and slidably connected to the left upper portion of the support base (1), the sliding sleeve (111) on the left side is connected to the first support frame (3) on the left side, and the sliding sleeve (111) on the right side is connected to the first support frame (3) on the right side; The protective frame (112) and the upper side of the sliding sleeve (111) are both connected to the protective frame (112); The connecting rod (113) and the sliding sleeve (111) are both rotatably connected to each other. The connecting rod (113) and the connecting rod (113) are both rotatably connected. When the electric push rod (2) is started, the electric push rod (2) drives the connecting rod (113) to move rightward, and the connecting rod (113) drives the protective frame (112) and the sliding sleeve (111) to move rightward.

6. A helmet strap toughness detection device according to claim 1, characterized in that: The helmet further includes an expansion mechanism (12) for further fixing the helmet fixing strap, and the expansion mechanism (12) includes: A connecting frame (121), wherein both upper and lower sides of the sliding block (72) are connected to the connecting frame (121); The rotating plate (122) and the connecting frame (121) are rotatably connected to the rotating plate (122) via a rotating shaft; a torsion spring (123) is wound around the rotating shaft, and two ends of the torsion spring (123) are respectively connected to the rotating plate (122) and the connecting frame (121). The sliding block (72) is pulled outward, and the sliding block (72) drives the connecting frame (121) and the rotating plate (122) to move outward, and the helmet fixing belt is placed between the sliding block (72) and the second support frame (71). The sliding block (72) is loosened, and the connecting frame (121) and the rotating plate (122) are driven to reset under the resetting action of the spring (74). The rotating plate (122 is pressed against the second support frame (71), and the torsion spring (123) is twisted by force.

7. The helmet strap toughness detection device according to claim 1, characterized in that: The bottom side of the upper clamping piece (5) is made of rubber material and is used to increase friction.

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