Safety helmet impact resistance puncture tester

Abstract

The utility model relates to the technical field of protective article testing, in particular to an impact puncture resistance tester for a safety helmet, which is characterized in that a base is provided with two fixed pipes and electric push rods which are fixedly connected to two sides of the base at intervals, threaded rods are inserted into the fixed pipes, the electric push rods are fixedly connected to one ends of the same sides of the fixed pipes, and the outer walls of two ends of the threaded rods abut against the electric push rods; the threaded rod is sleeved with the supporting assembly, the supporting assembly comprises a sliding block, a rotating rod, a rotating assembly and a connecting rod, the threaded rod is slidably sleeved with the sliding block, one end of the rotating rod is inserted into the top face of the sliding block, the rotating assembly is fixedly connected to the end, away from the sliding block, of the rotating rod, and the rotating assembly comprises a fixed cylinder and a rotating block; the rotating block is rotationally connected with the fixed cylinder, and the connecting rod is fixedly connected to the fixed cylinder; the protection cage is fixedly connected to the upper plate face of the base, the tester body is fixedly connected to the outer portion of the protection cage, an impact hammer of the tester body is located over the protection cage, and the effect of comprehensively detecting the impact puncture resistance of the safety helmet is achieved.

Description

Technical Field

[0001] This application relates to the field of protective equipment testing technology, and in particular to a helmet impact and puncture resistance tester. Background Technology

[0002] Currently, safety helmets are protective equipment used to prevent head injuries from impacts. They generally consist of a shell, liner, chin strap, and other accessories. When a worker's head is impacted by a falling object, the helmet shell and liner instantly distribute the impact force across the entire area of ​​the skull. Then, the elastic deformation and plastic deformation of various parts of the helmet absorb most of the impact force, thus protecting the worker's head. After manufacturing, safety helmets typically undergo impact and puncture resistance tests.

[0003] The existing impact puncture resistance tester includes a tester body, which includes a top plate, an electromagnet, a puncture cone, a floor, and a fixed bracket. The electromagnet is located in the middle of the top plate, and the puncture cone is attracted to the electromagnet. The fixed bracket is connected to a base at the bottom and is used to hold the safety helmet. By cooperating with the electromagnet, the puncture cone is dropped and impacts the safety helmet, thereby testing the impact puncture resistance of the safety helmet.

[0004] The existing technical solutions mentioned above have the following drawbacks: During the impact puncture test, the safety helmet is always directly below the puncture drop, and the puncture cone always impacts the top of the safety helmet. However, in actual use, the workers are dynamic, so the position and angle of impact on the safety helmet are not fixed, thus there is a problem of not being able to fully detect the impact. Utility Model Content

[0005] This application provides a helmet impact and puncture resistance tester to comprehensively test the impact and puncture resistance of helmets.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0007] A safety helmet impact and puncture resistance tester includes a base, a support assembly, a protective cage, and a tester body. The base is a rectangular plate with two fixed tubes fixedly connected to both sides of the base at intervals. An electric push rod is fixedly connected to the base. A threaded rod is inserted into the fixed tube. The electric push rod is fixedly connected to one end of the fixed tube on the same side. The outer walls of both ends of the threaded rod abut against the electric push rod.

[0008] The support assembly is sleeved on the threaded rod. The support assembly includes a sliding block, a rotating rod, a rotating component, and a connecting rod. The sliding block is slidably sleeved on the threaded rod. One end of the rotating rod is inserted into the top surface of the sliding block. The rotating component is fixedly connected to the end of the rotating rod away from the sliding block. The rotating component includes a fixed cylinder and a rotating block. The fixed cylinder is fixedly connected to the top end of the rotating rod. The rotating block is rotatably connected to the fixed cylinder. The connecting rod is fixedly connected to the fixed cylinder.

[0009] The protective cage is fixed to the upper plate of the base, and the tester body is fixed to the outside of the protective cage with the impact hammer of the tester body located directly above the protective cage.

[0010] By employing the above technical solution, the safety helmet is fixed to the connecting rod. The angle of the connecting rod is adjusted by rotating the assembly to simulate the helmet's performance under different static conditions. The impact and puncture resistance of the helmet is then tested using the testing instrument itself. Rotating the threaded rod and electric push rod pushes the screw, causing the sliding block to move, thus moving the helmet. The impact and puncture resistance of the helmet worn by the worker during movement is then tested using the testing instrument. This device can test the impact and puncture resistance of helmets under various conditions, facilitating testing from multiple angles and in multiple states, resulting in more comprehensive and accurate testing results.

[0011] Optionally, the outer wall of the fixed tube is provided with sliding holes, which are located in the middle of the two opposite outer walls of the fixed tube along the length of the fixed tube, and the two ends of the threaded rod are respectively inserted into the two opposite sliding holes.

[0012] By adopting the above technical solution, the threaded rod is inserted into the sliding hole, thereby limiting the threaded rod and preventing it from detaching from the fixed tube during movement.

[0013] Optionally, a limiting block is slidably installed in the sliding hole, and a first bearing is fixedly connected in the limiting block. The two ends of the threaded rod are respectively inserted into the two opposite first bearings.

[0014] By adopting the above technical solution, the limiting block is adapted to the sliding hole and can slide within the sliding hole, so that the electric push rod avoids direct contact with the threaded rod during the process of pushing the threaded rod, thereby helping to avoid mutual interference between the movement and rotation of the threaded rod.

[0015] Optionally, one end of the threaded rod is fixedly connected to a motor, and a slide rail is fixedly connected to the lower part of the motor. One side of the slide rail is fixedly connected to the lower part of the motor, and the other side of the slide rail is fixedly connected to the base.

[0016] By adopting the above technical solution, the rotation of the threaded rod is controlled by a motor, making it more convenient to rotate the threaded rod. The motor is installed on the slide rail, which reduces friction when the electric push rod pushes the threaded rod, thereby facilitating the adjustment of the sliding block sleeved on the threaded rod.

[0017] Optionally, a second bearing is fixedly connected inside the sliding block, and the rotating rod is inserted into the second bearing.

[0018] By adopting the above technical solution, the rotating rod can rotate more smoothly, thereby changing the position of the safety helmet test.

[0019] Optionally, the fixed cylinder has a receiving hole, which gradually decreases in size from one end to the other. The inner diameter of the hole at the end facing the rotating block is smaller than the inner diameter of the hole at the end facing away from the rotating block, and the shaft is inserted into the receiving hole.

[0020] By adopting the above technical solution, a section of shaft inserted into the receiving hole is adapted to the receiving hole, and the outer wall of the shaft abuts against the inner wall of the receiving hole, which helps to increase the friction between the shaft and the fixed cylinder, thereby fixing them together.

[0021] Optionally, a fixed cover is threadedly connected to the orifice of the receiving hole at the end opposite to the rotating block.

[0022] By adopting the above technical solution, the fixed cover is threaded to one end of the receiving hole, so that the receiving hole into which the shaft is inserted is sealed, which makes it more convenient to install the shaft and also helps to protect the receiving hole from foreign objects that may enter and thus hinder the rotation of the shaft.

[0023] Optionally, a spring is inserted into the receiving hole, with one end of the spring fixed to the fixed cover and the other end fixed to the end face of the shaft opposite to the rotating block.

[0024] By adopting the above technical solution, when adjusting the angle of the connecting rod, the shaft core is pressed into the receiving hole, which compresses the spring and rotates the connecting rod. After adjusting the angle of the connecting rod, the rotating block is released, the spring returns to its natural extension state, and the shaft core is pushed out of the receiving hole, thereby fixing the connecting rod and making the angle adjustment more convenient and easier to operate.

[0025] In summary, this application has the following technical effects:

[0026] 1. By setting up a base, support components, protective cage and testing instrument body, the angle of the connecting rod can be adjusted by rotating the components to simulate the situation of workers wearing safety helmets in different static states. The device can test the impact resistance and puncture resistance of safety helmets under various conditions, which is beneficial for the impact resistance and puncture resistance of safety helmets at multiple angles and under multiple states, making the test more comprehensive and the test results more accurate.

[0027] 2. By setting a sliding hole, the threaded rod is inserted into the sliding hole, thereby limiting the threaded rod and preventing it from coming off the fixed tube during movement;

[0028] 3. By setting a limit block, which is adapted to the sliding hole and can slide within the sliding hole, the electric push rod avoids direct contact with the threaded rod during the process of pushing the threaded rod, thereby helping to avoid interference between the movement and rotation of the threaded rod. Attached Figure Description

[0029] Figure 1 This is a structural diagram of the object of this application;

[0030] Figure 2 This is a structural diagram of the base and support components of this application;

[0031] Figure 3 This is a cross-sectional view of the rotating component of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Base; 11. Fixed tube; 111. Sliding hole; 112. Opening; 12. Limiting block; 121. First bearing; 13. Electric push rod; 14. Threaded rod; 15. Motor; 16. Slide rail; 2. Support assembly; 21. Sliding block; 22. Second bearing; 23. Rotating rod; 24. Rotating assembly; 241. Fixed cylinder; 242. Receiving hole; 243. Shaft core; 244. Fixed cover; 245. Spring; 246. Rotating block; 247. Nut; 25. Connecting rod; 26. Head mold; 3. Protective cage; 4. Tester body; 41. Telescopic rod; 42. Fixed rod; 43. Electromagnet; 44. Impact hammer; 45. Measuring device. Detailed Implementation

[0033] The present application will be further described in detail below with reference to the accompanying drawings.

[0034] This application discloses a helmet impact and puncture resistance tester, referring to... Figure 1 and Figure 2 The tester includes a base 1, a support assembly 2 slidably connected to the base 1, a protective cage 3 fixed to the base 1, and a tester body 4 fixed to the base 1. The base 1 is a rectangular plate, and fixed tubes 11 are provided on the base 1 and fixed to both sides of the base 1. Limiting blocks 12 are slidably installed in the fixed tubes 11, and a first bearing 121 is fixedly connected in the limiting blocks 12. A threaded rod 14 is inserted in the limiting blocks 12, and a motor 15 is fixedly connected to one end of the threaded rod 14. A slide rail 16 and an electric push rod 13 are fixedly connected to the base 1. The motor 15 is slidably mounted on the slide rail 16, and the telescopic end of the electric push rod 13 is fixedly connected to the limiting block 12.

[0035] Reference Figure 2The fixed tube 11 is a square tube, and two tubes are spaced apart. The two fixed tubes 11 are fixed to both sides of the upper plate of the base 1, and their lengths are parallel to each other. The length of each fixed tube 11 is less than the length of the base 1. Sliding holes 111 are provided on the outer walls of both fixed tubes 11, located at the midpoint of opposite outer walls along the length of the fixed tube 11. The length and width of each sliding hole 111 are less than the length of the fixed tube 11, and both ends of each sliding hole 111 are closed. A connecting hole is provided at the midpoint of the opposite side wall of each fixed tube 11 and the sliding hole 111, connecting the outer wall of the fixed tube 11 and the sliding hole 111. The length of the connecting hole is equal to the length of the sliding hole 111, and both ends are closed.

[0036] Reference Figure 2 Two limiting blocks 12 are provided, and the two limiting blocks 12 are slidably installed in two opposite sliding holes 111. The length of the limiting block 12 is less than the length of the sliding hole 111, and it is adapted to fit the sliding hole 111 and the inside of the fixed tube 11. The outer wall of the limiting block 12 is in contact with the inner wall of the fixed tube 11. A mounting hole is provided on the limiting block 12. The mounting hole is opened in the middle of the outer wall of the limiting block 12 and connects the inner wall and the outer wall of the limiting block 12. A first bearing 121 adapted to it is installed in the mounting hole.

[0037] Reference Figure 2 Both fixed tubes 11 have an opening 112 on one side of each tube. The cylinder of the electric push rod 13 is fixed to the base 1 outside the opening 112. The telescopic end of the electric push rod 13 passes through the opening 112 and connects with the end face of the limiting block 12.

[0038] Reference Figure 2 The two ends of the threaded rod 14 are respectively inserted into the first bearing 121. The length of the threaded rod 14 is equal to the distance between the two opposite outer walls of the fixed tube 11, and the two end faces of the threaded rod 14 are flush with the outer walls of the fixed tube 11. The shaft of the motor 15 is fixed to one end of the threaded rod 14, and the motor 15 can rotate the threaded rod 14. The slide rail 16 is arranged at intervals with the fixed tube 11 and fixed below the motor 15. One side of the slide rail 16 is fixed to the upper plate of the base 1, and the other side is slidably connected to the lower part of the motor 15. The length direction of the slide rail 16 is parallel to the length direction of the fixed tube 11. The extension and retraction of the electric push rod 13 causes the limiting block 12 to slide in the sliding hole 111, and drives the threaded rod 14 and the motor 15 fixed to the threaded rod 14 to move synchronously along the length direction of the base 1.

[0039] Reference Figure 2The support assembly 2 includes a sliding block 21 sleeved on the threaded rod 14, a second bearing 22 fixed to the top surface of the sliding block 21, a rotating rod 23 fixed at its lower end within the second bearing 22, a rotating assembly 24 fixed to the upper end of the rotating rod 23, a connecting rod 25 fixed at its lower end to the rotating assembly 24, and a head mold 26 fixed to the upper end of the connecting rod 25. The sliding block 21 is a rectangular block with a threaded hole in the middle of its end face along its length that matches the threaded rod 14. The sliding block 21 is threadedly connected to the threaded rod 14, and the length of the sliding block 21 is less than the length of the threaded rod 14. The lower bottom surface of the sliding block 21 is in contact with the upper plate surface of the base 1, and the sliding block 21 can move on the threaded rod 14 by rotating the threaded rod 14. A mounting hole is provided in the middle of the top surface of the sliding block 21, and the second bearing 22 is disposed in the mounting hole.

[0040] Reference Figure 2 and reference Figure 3 The rotating rod 23 is a round rod, and its lower end is inserted into the second bearing 22. The outer diameter of the rotating rod 23 is equal to the inner diameter of the second bearing 22. The outer wall of the rotating rod 23 is fixedly connected to the inner wall of the second bearing 22. The end face of the rotating rod 23 inserted into the second bearing 22 is spaced apart from the bottom of the mounting hole. The rotating assembly 24 includes a fixed cylinder 241 whose outer wall is fixed to the top of the rotating rod 23, a shaft core 243 inserted into the fixed cylinder 241, a fixed cover 244 threaded to one end of the fixed cylinder 241, a spring 245 fixed to the fixed cover 244 and located in the fixed cylinder 241, a rotating block 246 connected to the end of the shaft core 243 away from the spring 245, and a nut 247 threaded to the shaft core 243.

[0041] Reference Figure 3 The end face of the fixed cylinder 241 is perpendicular to the top face of the rotating rod 23. A receiving hole 242 is provided inside the fixed cylinder 241, and the diameter of the receiving hole 242 gradually decreases from one end to the other. A thread is provided on the inner wall of the larger end of the receiving hole 242, and the length of the thread is less than the depth of the receiving hole 242. The fixed cover 244 is threaded onto the thread at the larger end of the receiving hole 242.

[0042] Reference Figure 3The shaft core 243 is a tapered rod adapted to the receiving hole 242 and inserted into the receiving hole 242. The length of the shaft core 243 is less than the length of the receiving hole 242. The smaller diameter section of the shaft core 243 protrudes from the opening of the receiving hole 242 away from the thread, while the other section of the shaft core 243 is located inside the receiving hole 242. A spur gear is machined into the middle of the end face of the shaft core 243 protruding from the receiving hole 242. The diameter of the spur gear is less than the outer diameter of the smaller diameter end of the shaft core 243, and a screw is fixedly attached to the end face of the spur gear. The fixing cover 244 is an integrally formed external thread plug adapted to the thread and is threadedly connected to the opening of the receiving hole 242. The length of the fixing cover 244 is less than the depth of the receiving hole 242, and the outer diameter of the fixing cover 244 is equal to the diameter of the fixing cylinder 241.

[0043] Reference Figure 3 One end of the spring 245 is fixed to the outer wall of the threaded end of the fixed cover 244, and the other end is fixed to the end face of the shaft core 243 away from the screw. In its naturally extended state, the spring 245 pushes the end of the shaft core 243 with the screw fixed out of the receiving hole 242, and the outer wall of the end of the shaft core 243 away from the threaded rod 14 abuts against the inner wall of the receiving hole 242, preventing the shaft core 243 from rotating. The length of the spring 245 in its compressed state is not greater than the length of the shaft core 243 extending out of the receiving hole 242.

[0044] Reference Figure 3 The rotating block 246 is a round tube with a handle, and is spaced apart from the fixed cylinder 241. The outer diameter of the rotating block 246 is equal to the outer diameter of the fixed cylinder 241. An internal meshing gear, adapted to a spur gear, is formed in the middle of one end face of the rotating block 246. A round hole, with an inner diameter larger than the internal meshing gear, is fitted in the middle of the other end face of the rotating block 246 and communicates with the internal meshing gear. The inner diameter of the internal meshing gear is equal to the outer diameter of the spur gear. The rotating block 246 is sleeved on the shaft core 243, allowing the spur gear and the internal meshing gear to mesh with each other. A screw protrudes from the internal meshing gear and is located within the round hole. A nut 247 is threaded onto the screw and is located within the round hole, fixing the rotating block 246 to the shaft core 243. Pressing the rotating block 246 towards the fixed cylinder 241 causes the shaft core 243 to move into the receiving hole 242 and compress the spring 245, separating the outer wall of the shaft core 243 from the inner wall of the receiving hole 242, thus enabling the rotating block 246 to drive. Releasing the rotating block 246 causes the spring 245 to extend and push the shaft core 243 outward from the receiving hole 242, causing the outer wall of the shaft core 243 to adhere to and press against the inner wall of the receiving hole 242, increasing friction and fixing the shaft core 243, thereby fixing the rotating block 246.

[0045] Reference Figure 2 The connecting rod 25 is a round rod. One end of the connecting rod 25 is fixed to the outer wall of the rotating block 246, and the other end is connected to the head mold 26.

[0046] Reference Figure 1The protective cage 3 is a rectangular frame formed by four mesh panels connected in sequence, one of which can be opened. Two opposing mesh panels of the protective cage 3 are vertically fixed to the top surface of the fixing pipe 11. The length of the protective cage 3 is less than the length of the base 1, the width of the protective cage 3 is equal to the distance between the two fixing pipes 11, and the height of the protective cage 3 is greater than the height of the support assembly 2. The internal structure of the protective cage 3 can be observed through it while simultaneously providing protection.

[0047] Reference Figure 1 The testing instrument body 4 is vertically fixed to the upper plate of the base 1 and located outside the protective cage 3. The testing instrument body 4 includes a telescopic rod 41 vertically fixed to the upper plate of the base 1, a fixed rod 42 vertically fixed to the telescopic rod 41, an electromagnet 43 mounted on the fixed rod 42, an impact hammer 44 attracted to the electromagnet 43, and a measuring device 45. The central axis of the impact hammer 44 is located directly above the protective cage 3. The force sensor of the measuring device 45 is installed inside the head mold 26 to measure the impact force received by the head mold 26.

[0048] When testing the impact and puncture resistance of safety helmets, the helmet to be tested is placed on the head mold 26, and the connecting rod 25 is adjusted to a vertical position. The motor 15 and electric push rod 13 are used to align the midpoint of the top of the helmet with the central axis of the impact hammer 44. The telescopic rod 41 is adjusted to bring the impact hammer 44 to the test height, and the impact hammer 44 is released. The integrity of the helmet is then observed to determine its puncture resistance. The values ​​detected by the measuring device 45 are used to determine the helmet's impact resistance, thus simulating the impact and puncture resistance of the helmet during static operation. Adjusting the angle between the connecting rod 25 and the rotating rod 23 changes the helmet's position under the impact hammer 44. The electric push rod 13 and rotating threaded rod 14 position the head mold 26 below the impact hammer 44, and the impact hammer 44 is released, thus simulating the impact and puncture resistance of the helmet during dynamic operation.

[0049] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A helmet impact and puncture resistance tester, characterized in that: The instrument includes a base (1), a support assembly (2), a protective cage (3), and a tester body (4). The base (1) is a rectangular plate. Two fixed tubes (11) are fixedly connected to the two sides of the base (1) at intervals. An electric push rod (13) is fixedly connected to the base (1). A threaded rod (14) is inserted into the fixed tube (11). The electric push rod (13) is fixedly connected to one end of the fixed tube (11) on the same side. The outer walls of both ends of the threaded rod (14) abut against the electric push rod (13). The support assembly (2) is sleeved on the threaded rod (14). The support assembly (2) includes a sliding block (21), a rotating rod (23), a rotating assembly (24), and a connecting rod (25). The sliding block (21) is slidably sleeved on the threaded rod (14). One end of the rotating rod (23) is inserted into the top surface of the sliding block (21). The rotating assembly (24) is fixed to the end of the rotating rod (23) away from the sliding block (21). The rotating assembly (24) includes a fixed cylinder (241) and a rotating block (246). The fixed cylinder (241) is fixed to the top end of the rotating rod (23). The rotating block (246) is rotatably connected to the fixed cylinder (241). The connecting rod (25) is fixed to the fixed cylinder (241). The protective cage (3) is fixed to the upper plate of the base (1), and the tester body (4) is fixed to the outside of the protective cage (3) with the impact hammer (44) of the tester body (4) located directly above the protective cage (3).

2. The safety helmet impact and puncture resistance tester according to claim 1, characterized in that: The outer wall of the fixed tube (11) is provided with a sliding hole (111). The sliding hole (111) is opened in the middle of the two opposite outer walls of the fixed tube (11) along the length direction of the fixed tube (11). The two ends of the threaded rod (14) are respectively inserted into the two opposite sliding holes (111).

3. The safety helmet impact and puncture resistance tester according to claim 2, characterized in that: A limiting block (12) is slidably installed in the sliding hole (111), and a first bearing (121) is fixedly connected in the limiting block (12). The two ends of the threaded rod (14) are respectively inserted into the two opposite first bearings (121).

4. The safety helmet impact and puncture resistance tester according to claim 1, characterized in that: One end of the threaded rod (14) is fixedly connected to a motor (15), and a slide rail (16) is fixedly connected to the lower part of the motor (15). One side of the slide rail (16) is fixedly connected to the lower part of the motor (15), and the other side of the slide rail (16) is fixedly connected to the base (1).

5. The safety helmet impact and puncture resistance tester according to claim 4, characterized in that: The sliding block (21) is fixedly connected to a second bearing (22), and the rotating rod (23) is inserted into the second bearing (22).

6. The safety helmet impact and puncture resistance tester according to claim 1, characterized in that: The fixed cylinder (241) has a receiving hole (242) inside. The receiving hole (242) gradually decreases in size from one end to the other end. The inner diameter of the hole at the end facing the rotating block (246) is smaller than the inner diameter of the hole at the other end, and the shaft core (243) is inserted into the receiving hole (242).

7. The impact and puncture resistance tester for safety helmets according to claim 6, characterized in that: A fixing cap (244) is threadedly connected to the opening of the receiving hole (242) at the end opposite to the rotating block (246).

8. The safety helmet impact and puncture resistance tester according to claim 7, characterized in that: A spring (245) is inserted into the receiving hole (242). One end of the spring (245) is fixed to the fixed cover (244), and the other end is fixed to the end face of the shaft (243) away from the rotating block (246).

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