Helmet shell strength testing equipment based on high-precision pressure sensing

Abstract

The invention belongs to the technical field of helmet production, and discloses helmet shell strength testing equipment based on high-precision pressure sensing, which comprises a base, a sliding rail is fixedly connected to the outer wall of the top end of the base, a sliding block is slidably connected to the outer wall of the sliding rail, and the helmet shell strength testing equipment further comprises a fixing mechanism arranged on the outer wall of the sliding block through a rotating mechanism; the touch block is mounted on the outer wall of the top end of the base through a replacement mechanism; wherein the fixing mechanism comprises a fixing block, the inner wall of the fixing block is rotationally connected with a rotating disc, an inclined groove is formed in the outer wall of the rotating disc, the inner wall of the inclined groove is in contact with a moving rod, and high-precision pressure sensors are embedded in a touch block and the mold; through cooperation of structures such as the fixed block and the rotating disc, the rotating rod is rotated after limitation of the rotating rod is removed, and the movable rod and the clamping block can be driven to move towards the middle at the same time through cooperation of the inclined groove and the guide groove, so that the helmet below the mold can be conveniently and rapidly clamped and fixed, and operation is simple.

Description

Technical Field

[0001] This invention belongs to the field of helmet manufacturing technology, specifically a helmet shell strength testing device based on high-precision pressure sensing. Background Technology

[0002] The helmet shell strength testing equipment based on high-precision pressure sensing is a special testing device that integrates a high-precision pressure sensor, a loading actuator and a data acquisition and analysis system. Its core working logic is to apply pressure to the surface of the helmet shell through a preset loading path, and use a high-precision pressure sensor to capture the pressure value, deformation displacement and stress distribution at the shell contact point in real time.

[0003] A search revealed that CN220437970U discloses a safety helmet impact testing device, including an operating table. A vertical guide rail is fixedly connected to the operating table, and a pneumatic gripper is slidably connected to the vertical guide rail. The pneumatic gripper holds a slide block slidably connected to the vertical guide rail, and a head mold is fixedly connected to the slide block. A rotating shaft is fixed to the head mold. This invention has the following advantages and effects: it facilitates impact testing of various parts of the safety helmet, thereby enabling comprehensive helmet strength testing.

[0004] In actual use, the aforementioned device requires fixing the helmet to the head mold and then conducting a strength test through the helmet's free fall. The helmet is fixed by using a clamping plate on the outside of the helmet. However, during operation, the position of multiple clamping plates needs to be adjusted one by one, and the operator needs to manually turn the bolts multiple times to complete this task, which is cumbersome, time-consuming, and labor-intensive. Adjusting the helmet angle also requires turning the bolts, which reduces efficiency and increases workload. Therefore, to address the above problems, a helmet shell strength testing device based on high-precision pressure sensing is proposed. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides a helmet shell strength testing device based on high-precision pressure sensing.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a helmet shell strength testing device based on high-precision pressure sensing, comprising a base, a slide rail fixedly connected to the top outer wall of the base, a slider slidably connected to the outer wall of the slide rail, and further comprising: a fixing mechanism, which is disposed on the outer wall of the slider through a rotating mechanism; and a contact block, which is installed on the top outer wall of the base through a replacement mechanism. The fixing mechanism includes a fixing block, a turntable rotatably connected to the inner wall of the fixing block, an inclined groove on the outer wall of the turntable, a moving rod in contact with the inner wall of the inclined groove, a clamping block fixedly connected to the outer wall of the moving rod, a rotating rod fixedly connected to the outer wall of the turntable, a trapezoidal block elastically connected to the inner wall of the rotating rod via a connecting spring, a protrusion slidably connected to the inner wall of the rotating rod, a mold fixedly connected to the bottom outer wall of the fixing block, and high-precision pressure sensors embedded in both the contact block and the mold.

[0007] Preferably, the outer wall of the fixing block is provided with a guide groove, the outer wall of the rotating rod is slidably connected with a slide rod A, and the top outer wall of the fixing block is fixedly connected with a fixing ring.

[0008] Preferably, the moving rod contacts the inner wall of the guide groove, the rotating rod passes through the top outer wall of the fixed block, and the rotating rod is rotatably connected to the inner wall of the fixed block.

[0009] Preferably, one end of the connecting spring is fixedly connected to the outer wall of the trapezoidal block, the other end of the connecting spring is fixedly connected to the inner wall of the rotating rod, the trapezoidal block is slidably connected to the inner wall of the rotating rod, one end of the slide rod A is fixedly connected to the outer wall of the protrusion, and the other end of the slide rod A is slidably connected to the outer wall of the trapezoidal block.

[0010] Preferably, the rotating mechanism includes a fixed rod, a rotating rod rotatably connected to the inner wall of the fixed rod, a slot provided on the outer wall of the rotating rod, an inclined block elastically connected to the inner wall of the fixed rod via a return spring, a slide rod B slidably connected to the outer wall of the inclined block, an insert block fixedly connected to the outer wall of the slide rod B, and a moving ring fixedly connected to the outer wall of the inclined block.

[0011] Preferably, the fixed rod is fixedly connected to the outer wall of the slider, the rotating rod is fixedly connected to the outer wall of the fixed block, and the insert block is engaged with the slot.

[0012] Preferably, one end of the return spring is fixedly connected to the outer wall of the inclined block, the other end of the return spring is fixedly connected to the inner wall of the fixed rod, the inclined block is slidably connected to the inner wall of the fixed rod, and the moving ring is slidably connected to the outer wall of the fixed rod.

[0013] Preferably, the replacement mechanism includes a support rod, a connecting block is fixedly connected to the outer wall of the support rod, a movable block is elastically connected to the inner wall of the connecting block via a telescopic spring, a rotating wheel is rotatably connected to the inner wall of the connecting block, a pull rope is wound around the outer wall of the rotating wheel, a handle is fixedly connected to the outer wall of the connecting block, a partition is slidably connected to the outer wall of the handle, and a square groove is formed on the inner wall of the touch block.

[0014] Preferably, the support rod is fixedly connected to the top outer wall of the base, one end of the telescopic spring is fixedly connected to the outer wall of the moving block, and the other end of the telescopic spring is fixedly connected to the inner wall of the connecting block.

[0015] Preferably, the two ends of the pull rope are fixedly connected to the outer wall of the partition and the movable block, respectively, and the movable block is engaged with the square groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the combination of a fixed block and a turntable, allows the operator to press the pressure bar on the trapezoidal block, release the limit of the rotating rod, and rotate the rotating rod to drive the turntable to rotate synchronously. Through the cooperation of the inclined groove and the guide groove, the moving rod and the clamping block can be moved to the center at the same time, so as to conveniently and quickly clamp and fix the helmet under the mold. The operation is relatively simple. This invention, through the cooperation of structures such as a rotating rod and an insert block, allows the moving ring to be moved, and the insert block to be moved and disengaged from the slot via the inclined block. At this time, the limiting position of the rotating rod can be released, and the entire fixing mechanism can be rotated so that other parts of the helmet correspond to the contact block, thereby making it convenient and quick to adjust the helmet angle without the need for adjustment by rotating bolts, which is more efficient. This invention, through the cooperation of structures such as connecting blocks and moving blocks, allows the operator to remove the contact block by pulling the partition to disengage the moving block from the square groove when the contact block needs to be replaced. During installation, the moving block is engaged with the square groove by the elastic force of the telescopic spring, thus completing the installation and fixing. The operation is convenient and simple. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the disassembled rotating mechanism of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the fixing block and rotating rod of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the rotating rod of the present invention; Figure 5 This is a cross-sectional exploded view of the rotating rod and the fixed rod of the present invention. Figure 6 For the present invention Figure 5 Enlarged structural diagram of section A; Figure 7 This is a cross-sectional exploded structural diagram of the connecting block and the contact block of the present invention.

[0018] In the picture: 100. Base; 200. Fixing mechanism; 201. Fixing block; 202. Guide groove; 203. Turntable; 204. Inclined groove; 205. Moving rod; 206. Clamping block; 207. Rotating rod; 208. Trapezoidal block; 209. Connecting spring; 210. Slide rod A; 211. Protrusion; 212. Fixing ring; 300. Rotating mechanism; 301. Fixed rod; 302. Rotating rod; 303. Slot; 304. Return spring; 305. Inclined block; 306. Slide rod B; 307. Insert block; 308. Moving ring; 400. Changing mechanism; 401. Support rod; 402. Connecting block; 403. Telescopic spring; 404. Moving block; 405. Rotary wheel; 406. Pull rope; 407. Partition plate; 408. Handle; 409. Square groove; 500, slide rail; 600, slider; 700, mold; 800, touch block. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1 to 7 As shown, the present invention provides a helmet shell strength testing device based on high-precision pressure sensing, including a base 100, a slide rail 500 fixedly connected to the top outer wall of the base 100, a slider 600 slidably connected to the outer wall of the slide rail 500, and further including: a fixing mechanism 200, which is disposed on the outer wall of the slider 600 through a rotating mechanism 300; and a contact block 800, which is installed on the top outer wall of the base 100 through a replacement mechanism 400. The fixing mechanism 200 includes a fixing block 201, a turntable 203 rotatably connected to the inner wall of the fixing block 201, an inclined groove 204 on the outer wall of the turntable 203, a moving rod 205 in contact with the inner wall of the inclined groove 204, a clamping block 206 fixedly connected to the outer wall of the moving rod 205, a rotating rod 207 fixedly connected to the outer wall of the turntable 203, a trapezoidal block 208 elastically connected to the inner wall of the rotating rod 207 via a connecting spring 209, a protrusion 211 slidably connected to the inner wall of the rotating rod 207, and a mold 700 fixedly connected to the bottom outer wall of the fixing block 201. High-precision pressure sensors are embedded on both the contact block 800 and the mold 700.

[0021] The above solution employs the following: high-precision pressure sensors are embedded in both the contact block 800 on the base 100 and the mold 700 for more accurate testing of the helmet's strength. The slider 600 and slide rail 500 are existing technologies. The slide rail 500 can electrically drive the slider 600 to move upward and fall freely, thereby causing the helmet, fixed by the fixing mechanism 200 on the slider 600, to fall freely and contact the contact block 800 for strength testing. The operation of the fixing mechanism 200 and the rotating mechanism 300 is convenient and quick, eliminating the need for operators to manually rotate bolts, thus improving testing efficiency. The helmet can be clamped by the four sets of clamping blocks 206 in the fixing mechanism 200, and the inside of the helmet will be in contact with the pressure sensor under the mold 700. After the helmet contacts the contact block 800, the pressure sensor on the mold 700 and the contact block 800 can test the pressure strength.

[0022] like Figures 2 to 4 As shown, a guide groove 202 is provided on the outer wall of the fixed block 201, a slide rod A210 is slidably connected to the outer wall of the rotating rod 207, and a fixing ring 212 is fixedly connected to the top outer wall of the fixed block 201; the moving rod 205 contacts the inner wall of the guide groove 202, the rotating rod 207 passes through the top outer wall of the fixed block 201, and the rotating rod 207 is rotatably connected to the inner wall of the fixed block 201; one end of the connecting spring 209 is fixedly connected to the outer wall of the trapezoidal block 208, and the other end of the connecting spring 209 is fixedly connected to the inner wall of the rotating rod 207, the trapezoidal block 208 is slidably connected in the inner wall of the rotating rod 207, one end of the slide rod A210 is fixedly connected to the outer wall of the protrusion 211, and the other end of the slide rod A210 is slidably connected to the outer wall of the trapezoidal block 208. Using the above scheme: Turntable 203 can be rotated by rotating rod 207. When the operator manually rotates rotating rod 207, turntable 203 rotates and inclined groove 204 squeezes moving rod 205. Since moving rod 205 is in contact with the inner wall of guide groove 202, it can only move along the inner wall of guide groove 202 under the guiding action, which will drive clamping block 206 to move synchronously to the middle or the outside. The rotating rod 207 can be limited by fixing ring 212. The inner wall of fixing ring 212 has four sets of grooves. After the protrusion 211 is engaged with the groove, the rotating rod 207 is in a fixed state. Since the protrusion 211 is provided with two symmetrical sets, the rotating rod 207 can be fixed in two states. The protrusion 211 is engaged with different grooves. Under normal conditions, due to the elasticity of connecting spring 209, trapezoidal block 208 is in a certain position. Sliding rod A210 is in contact with the long side inclined surface of trapezoidal block 208, which drives protrusion 211 to be in the pop-out state. The top of trapezoidal block 208 is provided with A pressure bar is provided. When the operator presses down the pressure bar, it causes the trapezoidal block 208 to move downwards synchronously. Its inclined surface causes the sliding rod A210 to move. Since the sliding rod A210 can only move laterally, it can cause the protrusion 211 to move synchronously towards the center. When the sliding rod A210 moves to the short side inclined surface of the trapezoidal block 208, the protrusion 211 can disengage from the groove in the inner wall of the fixing ring 212. Then, the rotating rod 207 can be rotated to adjust the position of the clamping block 206; the clamping block 206 moves outwards. When in motion, the helmet can be placed under and against the mold 700. When the clamping block 206 moves inward, it can clamp the mold 700. At this time, the pressure bar on the trapezoidal block 208 is released, and the connecting spring 209 will drive the trapezoidal block 208 to move upward and reset. The inclined surface presses the sliding rods A210 and protrusions 211 on both sides to make them move outward, so that they can be engaged with the other two sets of grooves to fix the rotating rod 207, thereby fixing the position of the clamping block 206 and maintaining the clamping effect on the helmet.

[0023] like Figure 2 , Figure 5 and Figure 6 As shown, the rotating mechanism 300 includes a fixed rod 301, a rotating rod 302 rotatably connected to the inner wall of the fixed rod 301, a slot 303 opened on the outer wall of the rotating rod 302, an inclined block 305 elastically connected to the inner wall of the fixed rod 301 through a return spring 304, a slide rod B306 slidably connected to the outer wall of the inclined block 305, an insert block 307 fixedly connected to the outer wall of the slide rod B306, and a moving ring 308 fixedly connected to the outer wall of the inclined block 305.

[0024] Using the above scheme: the rotating mechanism 300 is used to rotate the fixing mechanism 200 to adjust the angle of the helmet. At this time, the free fall of the slider 600 allows different positions on the helmet surface to contact the contact block 800, thereby conducting strength tests on different positions. Under normal conditions, the return spring 304 causes the inclined block 305 to be in a pop-out state due to its elasticity. The inclined surface of the inclined block 305 drives the slide bar B306 to be fixed with the insert block 307. The slots 303 on the outer wall of the rotating rod 302 are provided in multiple sets, which are evenly distributed on the outer wall of the rotating rod 302. The insert block 307 can be engaged with the slots 303 on the outer wall of the rotating rod 302 to limit the rotation rod 302 and the fixing mechanism 200, and can fix the rotating rod 302 at multiple angles.

[0025] like Figure 2 , Figure 5 and Figure 6 As shown, the fixed rod 301 is fixedly connected to the outer wall of the slider 600, the rotating rod 302 is fixedly connected to the outer wall of the fixed block 201, and the insert block 307 is engaged with the slot 303; one end of the return spring 304 is fixedly connected to the outer wall of the inclined block 305, the other end of the return spring 304 is fixedly connected to the inner wall of the fixed rod 301, the inclined block 305 is slidably connected to the inner wall of the fixed rod 301, and the moving ring 308 is slidably connected to the outer wall of the fixed rod 301.

[0026] Using the above scheme: the moving ring 308 can only move laterally on the outer wall of the fixed rod 301 and cannot rotate. When the moving ring 308 is manually moved, it will drive the inclined block 305 to move synchronously, compressing the return spring 304. The inclined surface of the inclined block 305 exerts a force on the sliding rod B306, causing the sliding rod B306 to drive the corresponding insert 307 to move laterally to both sides and disengage from the slot 303. This releases the limit of the rotating rod 302, allowing it to rotate and drive the fixed mechanism 200 to rotate synchronously. When rotated to a suitable angle, the insert 307 corresponds to the other two sets of slots 303. At this time, the moving ring 308 can be released, the return spring 304 drives the inclined block 305 to reset, and the inclined surface of the inclined block 305 pushes the sliding rod B306 and the insert 307 to reset. The insert 307 is inserted into the slot 303 to fix the fixed mechanism 200. Neither the fixed mechanism 200 nor the rotating mechanism 300 needs to be operated by rotating bolts, making it simple and quick.

[0027] like Figure 7As shown, the replacement mechanism 400 includes a support rod 401, a connecting block 402 fixedly connected to the outer wall of the support rod 401, a moving block 404 elastically connected to the inner wall of the connecting block 402 via a telescopic spring 403, a rotating wheel 405 rotatably connected to the inner wall of the connecting block 402, a pull rope 406 wound around the outer wall of the rotating wheel 405, a handle 408 fixedly connected to the outer wall of the connecting block 402, a partition 407 slidably connected to the outer wall of the handle 408, and a square groove 409 opened on the inner wall of the contact block 800.

[0028] Using the above solution: the touch block 800 can be easily replaced by the replacement mechanism 400 for replacement or removal for maintenance. Under normal conditions, the telescopic spring 403 keeps the moving block 404 in a certain position due to its elasticity. The square groove 409 above the moving block 404 can always engage with the square groove 409 on the inner wall of the touch block 800, thereby fixing the connecting block 402 to the touch block 800. The operator can remove the touch block 800 by holding the handle 408 and pulling the partition 407 to move the moving block 404 towards the center. The square block will then disengage from the square groove 409.

[0029] like Figure 7 As shown, the support rod 401 is fixedly connected to the top outer wall of the base 100, one end of the telescopic spring 403 is fixedly connected to the outer wall of the moving block 404, and the other end of the telescopic spring 403 is fixedly connected to the inner wall of the connecting block 402; both ends of the pull rope 406 are fixedly connected to the partition 407 and the outer wall of the moving block 404 respectively, and the moving block 404 is engaged with the square groove 409.

[0030] Using the above scheme: When the partition 407 is pulled, the partition 407 will pull one end of the pull rope 406 to move. When the pull rope 406 moves, it changes the direction of the pulling force through the rotating wheel 405, and the rotating wheel 405 will rotate to reduce friction. The other end of the pull rope 406 will pull the moving block 404 to move towards the center, compressing the telescopic spring 403, so that the moving block 404 moves as a whole into the inner wall of the connecting block 402. In this state, the touch block 800 can be removed from the connecting block 402, or the touch block 800 can be placed on the connecting block 402. After the partition 407 is released, the pull rope 406 loses its pulling force, and the telescopic spring 403 will drive the moving block 404 to pop out to both sides. The square block on the outer wall of the moving block 404 is inserted into the square groove 409 to complete the fixing effect of the touch block 800.

[0031] Working principle and usage process of this invention: When fixing the helmet, the operator can place the helmet to be tested under the mold 700, so that the inner wall of the helmet is in close contact with the high-precision pressure sensor embedded at the bottom of the mold 700. Then, press the pressure bar above the trapezoidal block 208. The trapezoidal block 208 moves down, causing the slide bar A210 and the protrusion 211 to move towards the center. After releasing the limit of the rotating rod 207, rotate the rotating rod 207, causing the turntable 203 to rotate. The turntable 203 pushes the moving rod 205 along the guide groove 202 through the inclined groove 204, causing the clamping block 206 to move towards the center at the same time and clamp the outer wall of the helmet, ensuring that the helmet is fixed firmly and that the inner wall of the helmet is in contact with the sensor under the mold 700.

[0032] After completion, the pressure rod can be released, the connecting spring 209 resets and pushes the trapezoidal block 208 upward. The inclined surface of the trapezoidal block 208 squeezes the slide bar A210 and the protrusion 211 outward and pops them outward. The protrusion 211 is inserted into the corresponding groove on the inner wall of the fixing ring 212, fixing the position of the rotating rod 207 and maintaining the stable clamping of the helmet by the clamping block 206.

[0033] Next, the slide rail 500 can be driven by the electronic control system to move the slider 600 and the helmet fixed on the slider 600 upward along the slide rail 500 to a preset height. Then, the slider 600 is controlled to fall freely, causing the helmet to fall synchronously until the helmet shell contacts the contact block 800. When the helmet impacts the contact block 800, the high-precision pressure sensors on the mold 700 and the contact block 800 synchronously collect pressure data, record the strength limit that the helmet shell can withstand, and complete the strength test of a single part.

[0034] When testing other parts of the helmet, the operator can manually move the moving ring 308, causing the inclined block 305 to move along the inner wall of the fixed rod 301, compressing the return spring 304. The inclined block 305, through the slide rod B306, causes the insert 307 to move to both sides, disengaging from the slot 303 on the outer wall of the rotating rod 302, thus releasing the limit of the rotating rod 302. At this time, the rotating rod 302 can be rotated, causing the fixing mechanism 200 and the clamped helmet to rotate synchronously until the part of the helmet to be tested is aligned with the contact block 800 on the base 100. The moving ring 308 is then released, the return spring 304 pushes the inclined block 305 to reset, and the inclined surface of the inclined block 305 pushes the slide rod B306 and the insert 307 to reset. The insert 307 then engages in the corresponding slot 303, fixing the rotating rod 302 and ensuring that the helmet angle does not shift during the test. The test steps can then be repeated for further testing.

[0035] After the test is completed, press the pressure bar on the trapezoidal block 208 and rotate the rotating rod 207 in the opposite direction. The clamping block 206 moves outward to test and unlock the helmet, so that the tested helmet can be removed from the mold 700.

[0036] If the contact block 800 becomes worn after prolonged collisions and needs to be replaced or maintained, the operator can hold the handle 408 and pull the partition 407, and pull the moving block 404 towards the center through the pull rope 406, so that the moving block 404 disengages from the square groove 409 on the inner wall of the contact block 800, and the contact block 800 can be removed. After replacing the new contact block 800, repeat the above steps to move the moving block 404 into the inner wall of the connecting block 402, place the contact block 800 on the connecting block 402, release the partition 407, and the telescopic spring 403 pushes the moving block 404 back to its original position, locking it into the square groove 409 to fix the contact block 800, making the replacement convenient and quick.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A helmet shell strength testing device based on high-precision pressure sensing, comprising a base (100), characterized in that: The top outer wall of the base (100) is fixedly connected to a slide rail (500), and the outer wall of the slide rail (500) is slidably connected to a slider (600). The base also includes: A fixing mechanism (200) is provided on the outer wall of the slider (600) via a rotating mechanism (300); A touch block (800) is mounted on the top outer wall of the base (100) via a replacement mechanism (400); The fixing mechanism (200) includes a fixing block (201), a turntable (203) is rotatably connected to the inner wall of the fixing block (201), an inclined groove (204) is provided on the outer wall of the turntable (203), a moving rod (205) is contacted on the inner wall of the inclined groove (204), a clamping block (206) is fixedly connected to the outer wall of the moving rod (205), a rotating rod (207) is fixedly connected to the outer wall of the turntable (203), a trapezoidal block (208) is elastically connected to the inner wall of the rotating rod (207) through a connecting spring (209), a protrusion (211) is slidably connected to the inner wall of the rotating rod (207), a mold (700) is fixedly connected to the bottom outer wall of the fixing block (201), and a high-precision pressure sensor is embedded on both the contact block (800) and the mold (700).

2. The helmet shell strength testing device based on high-precision pressure sensing according to claim 1, characterized in that: The outer wall of the fixed block (201) is provided with a guide groove (202), the outer wall of the rotating rod (207) is slidably connected with a slide rod A (210), and the top outer wall of the fixed block (201) is fixedly connected with a fixing ring (212).

3. The helmet shell strength testing device based on high-precision pressure sensing according to claim 1, characterized in that: The moving rod (205) contacts the inner wall of the guide groove (202), the rotating rod (207) penetrates the top outer wall of the fixed block (201), and the rotating rod (207) is rotatably connected to the inner wall of the fixed block (201).

4. The helmet shell strength testing device based on high-precision pressure sensing according to claim 2, characterized in that: One end of the connecting spring (209) is fixedly connected to the outer wall of the trapezoidal block (208), and the other end of the connecting spring (209) is fixedly connected to the inner wall of the rotating rod (207). The trapezoidal block (208) is slidably connected to the inner wall of the rotating rod (207). One end of the sliding rod A (210) is fixedly connected to the outer wall of the protrusion (211), and the other end of the sliding rod A (210) is slidably connected to the outer wall of the trapezoidal block (208).

5. The helmet shell strength testing device based on high-precision pressure sensing according to claim 1, characterized in that: The rotating mechanism (300) includes a fixed rod (301), a rotating rod (302) is rotatably connected to the inner wall of the fixed rod (301), a slot (303) is provided on the outer wall of the rotating rod (302), an inclined block (305) is elastically connected to the inner wall of the fixed rod (301) through a return spring (304), a slide rod B (306) is slidably connected to the outer wall of the inclined block (305), an insert block (307) is fixedly connected to the outer wall of the slide rod B (306), and a moving ring (308) is fixedly connected to the outer wall of the inclined block (305).

6. The helmet shell strength testing device based on high-precision pressure sensing according to claim 5, characterized in that: The fixed rod (301) is fixedly connected to the outer wall of the slider (600), the rotating rod (302) is fixedly connected to the outer wall of the fixed block (201), and the insert (307) is engaged with the slot (303).

7. The helmet shell strength testing device based on high-precision pressure sensing according to claim 5, characterized in that: One end of the return spring (304) is fixedly connected to the outer wall of the inclined block (305), and the other end of the return spring (304) is fixedly connected to the inner wall of the fixed rod (301). The inclined block (305) is slidably connected to the inner wall of the fixed rod (301), and the moving ring (308) is slidably connected to the outer wall of the fixed rod (301).

8. The helmet shell strength testing device based on high-precision pressure sensing according to claim 1, characterized in that: The replacement mechanism (400) includes a support rod (401), a connecting block (402) is fixedly connected to the outer wall of the support rod (401), a moving block (404) is elastically connected to the inner wall of the connecting block (402) through a telescopic spring (403), a rotating wheel (405) is rotatably connected to the inner wall of the connecting block (402), a pull rope (406) is wound around the outer wall of the rotating wheel (405), a handle (408) is fixedly connected to the outer wall of the connecting block (402), a partition (407) is slidably connected to the outer wall of the handle (408), and a square groove (409) is opened on the inner wall of the touch block (800).

9. The helmet shell strength testing device based on high-precision pressure sensing according to claim 8, characterized in that: The support rod (401) is fixedly connected to the top outer wall of the base (100), one end of the telescopic spring (403) is fixedly connected to the outer wall of the moving block (404), and the other end of the telescopic spring (403) is fixedly connected to the inner wall of the connecting block (402).

10. The helmet shell strength testing device based on high-precision pressure sensing according to claim 8, characterized in that: The two ends of the pull rope (406) are fixedly connected to the outer walls of the partition (407) and the moving block (404), respectively, and the moving block (404) is engaged with the square groove (409).

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