Rotatable fire fighting helmet impact absorption performance testing device

What is AI technical title?
AI technical title is built by Patsnap AI team. It summarizes the technical point description of the patent document.
By designing a rotatable fire helmet impact absorption performance test device and utilizing the rotation function of the ball head rod and the central installation of the acceleration sensor, the problem that the existing device can only test the vertical axial acceleration is solved. The multi-directional impact absorption performance test of the fire helmet is realized, and the test accuracy and reliability are improved.

CN223400568UActive Publication Date: 2025-09-30SHANGHAI FIRE RES INST OF MEM

View PDF 0 Cites 0 Cited by

Patent Information

Application Number: CN202422636562.7
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-10-30
Publication Date: 2025-09-30
Estimated Expiration: 2034-10-30

AI Technical Summary

Technical Problem

Existing fire helmet impact absorption performance testing equipment can only test vertical axial acceleration and cannot comprehensively evaluate the helmet's impact absorption performance in all directions, resulting in incomplete test results and an inability to effectively ensure the safety of firefighters.

Method used

A rotatable fire helmet impact absorption performance test device was designed. It adopted a combined structure of a beam frame, a ball head rod, an acceleration sensor and a head mold. The impact positioning with multiple degrees of freedom was achieved by rotating the ball part of the ball head rod. The acceleration sensor was installed in the center of the head mold to reduce the influence of vibration and noise, and realize impact testing in four directions.

Benefits of technology

It realizes the impact positioning of the top, front, side and rear of the fire helmet, improves the accuracy and repeatability of the test results, simplifies the operation process, and ensures the high accuracy and reliability of the test.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN223400568U_ABST

Patent Text Reader

Abstract

The utility model provides a rotatable fire fighting helmet impact absorption performance testing device. The rotatable fire fighting helmet impact absorption performance testing device comprises a beam frame, a ball head rod, an acceleration sensor and a head mold. According to the rotatable fire-fighting helmet impact absorption performance testing device provided by the utility model, the acceleration sensor is arranged at the central part of the head mold, so that the influence of high-frequency noise generated by vibration of connecting pieces such as a beam frame and a connecting part of a ball head rod and the head mold is reduced, the high precision of a test result is ensured, the repeatability is good, and the reliability is high. Impact positioning in four directions of the top, the front part, the side part and the rear part of the fire-fighting helmet is realized by utilizing a mode that the ball part of the ball head rod flexibly rotates in all directions, the device can be used for an acceleration test in an impact absorption performance test of the fire-fighting helmet in multi-degree-of-freedom rotation, and the device is convenient to adjust and simple to operate.

Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model belongs to the technical field of fire helmet testing equipment, in particular to a rotatable fire helmet impact absorption performance testing device. Background Art

[0002] Fire helmets are a crucial piece of personal protective equipment for firefighters, providing effective head protection. The impact absorption performance of fire helmets is a key technical indicator determining their protective performance. my country's GA44-2004 "Fire Helmets" industry standard stipulates that fire helmets must pass impact absorption testing.

[0003] Currently, testing equipment in various countries is developed according to their own national standards, but the testing principle is to ensure that the impact acceleration of the human brain does not exceed 600g after the fire helmet's cushioning effect. At the same time, the requirements for the protective area usually take into account head movement, and the helmet must be tested for impact in all directions. During testing, the fire helmet sample is worn on a test headform and subjected to impact from all directions. The impact acceleration of the headform is collected by an accelerometer installed on the headform. Since the accelerometers used today can only measure acceleration values in the vertical axis, in order to facilitate the testing of the cushioning effect in all directions, it is necessary to develop a test headform that can rotate with multiple degrees of freedom. This is used to wear the fire helmet, facilitate the study of impact absorption performance, and more comprehensively evaluate the performance of the helmet to ensure the safety of firefighters. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a rotatable fire helmet impact absorption performance testing device to more comprehensively evaluate the quality of the fire helmet's impact absorption performance.

[0005] In order to achieve the above purpose, the solutions adopted by the present invention are as follows:

[0006] The utility model provides a rotatable fire helmet impact absorption performance testing device, comprising a beam frame, a ball head rod, an acceleration sensor and a head mold; wherein,

[0007] The bottom of the beam is connected to the ball head rod;

[0008] The ball head rod includes a connecting portion and a ball portion. The connecting portion is elongated and connected to the bottom of the beam frame. The ball portion is located at one end of the connecting portion. A blind hole is provided on the ball portion. An acceleration sensor is provided in the blind hole. The angle between the extending direction of the connecting portion and the machining axis of the blind hole is less than 90°.

[0009] The head mold is a hemispherical body, comprising a downward hemispherical arc surface and a top, a hemispherical concave portion is provided on the top, and the bottom of the ball portion of the ball head rod is fixed in the hemispherical concave portion.

[0010] Preferably, the beam frame includes a transverse rod, a longitudinal rod and oblique reinforcement ribs, the transverse rod is located at the top of the beam frame, and the connecting portion of the ball head rod is connected to the longitudinal rod and the end portion of the oblique reinforcement rib of the beam frame.

[0011] Preferably, the central axis of the hemispherical body of the headform is perpendicular to the transverse rods of the beam frame, and the top plane of the headform is parallel to the transverse rods of the beam frame.

[0012] Preferably, the machining axis of the blind hole on the ball portion of the ball head rod is perpendicular to the transverse rod of the beam frame and coincides with the central axis of the hemispherical body of the head mold.

[0013] Preferably, a lifting ring is provided on the top of the transverse rod of the beam frame, and the lifting ring is located on the processing axis of the blind hole on the ball part of the ball head rod.

[0014] Preferably, a mounting boss is provided on the top of the head mold, the opening of the hemispherical recess on the top of the head mold is located in the mounting boss, and a plurality of first mounting holes are provided on the mounting boss that are evenly distributed around the circumference of the opening of the hemispherical recess on the top of the head mold.

[0015] Preferably, a pressure plate is further included, which is annular and includes a through hole for passing the ball portion of the ball head rod and a through groove connected to one side of the through hole. Second mounting holes corresponding to several first mounting holes on the mounting boss on the top of the head mold are provided on the pressure plate, and the pressure plate is fixed to the mounting boss on the top of the head mold by setting screws through the first mounting holes and the second mounting holes to fix the ball head rod in the hemispherical recess of the head mold.

[0016] Preferably, a gasket having the same shape as the pressing plate is provided between the pressing plate and the mounting boss on the top of the head mold.

[0017] Preferably, the acceleration sensor is a piezoelectric ceramic shear uniaxial sensor.

[0018] Beneficial effects

[0019] The utility model provides a rotatable fire helmet impact absorption performance testing device, in which an acceleration sensor is installed at the center of a head mold, reducing the influence of high-frequency noise generated by connecting parts such as a beam frame and a connecting part of a ball head rod and the vibration of the head mold, ensuring high precision and good repeatability of the test results, and utilizing the flexible rotation of the ball part of the ball head rod in all directions to achieve impact positioning of the fire helmet in four directions: the top, front, side and rear. It can be used for acceleration tests in impact absorption performance tests of fire helmets with multiple degrees of freedom of rotation, and is easy to adjust and simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a rotatable fire helmet impact absorption performance testing device involved in the utility model.

[0021] Figure 2 This is a structural schematic diagram of the beam frame of the rotatable fire helmet impact absorption performance testing device involved in the utility model.

[0022] Figure 3 This is a partial sectional view of the main view of the ball head rod of the rotatable fire helmet impact absorption performance testing device involved in the utility model.

[0023] Figure 4 The utility model is a top view of a partial cross-sectional view of a ball head rod of a rotatable fire helmet impact absorption performance testing device.

[0024] Figure 5 This is a front cross-sectional view of a head mold of a rotatable fire helmet impact absorption performance testing device involved in the present invention.

[0025] Figure 6 This is a top view of the head mold of the rotatable fire helmet impact absorption performance testing device involved in the utility model.

[0026] Figure 7 This is a front cross-sectional view of a pressure plate of a rotatable fire helmet impact absorption performance testing device involved in the present invention.

[0027] Figure 8 This is a top view of the pressure plate of the rotatable fire helmet impact absorption performance testing device involved in the utility model. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0033] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0034] To this end, the following solutions are proposed:

[0035] See also Figure 1 The utility model provides a rotatable fire helmet impact absorption performance testing device, which includes a beam frame 1, a ball head rod 2, an acceleration sensor 3, a pressure plate 4, a gasket 5 and a head mold 6.

[0036] Specifically, combined Figure 2 As shown, the beam frame 1 includes a transverse rod 11, a longitudinal rod 12 and an oblique reinforcement rib 13, wherein the transverse rod 11 is located at the top of the beam frame 1, and the bottom of the beam frame 1 is connected to the ball head rod 2.

[0037] Further, combined with Figure 3 and Figure 4 As shown, the ball head rod 2 includes a connecting portion 21 and a ball portion 22. The connecting portion 21 is long and connected to the bottom of the beam frame 1, and the ball portion 22 is located at one end of the connecting portion 21. In one embodiment of the present invention, the connecting portion 21 of the ball head rod 2 is connected to the ends of the longitudinal rod 12 and the oblique reinforcement rib 13 of the beam frame 1. In some embodiments, a fixing screw hole 211 is provided on the connecting portion 21 of the ball head rod 2 for fixed connection with the ends of the longitudinal rod 12 and the oblique reinforcement rib 13 of the beam frame 1. A blind hole 221 is provided on the ball portion 22 of the ball head rod 2, and the acceleration sensor 3 is arranged in the blind hole 221. The angle between the processing axis of the blind hole 221 and the extension direction of the connecting portion 21 of the ball head rod 2 is less than 90°. In one embodiment of the present invention, the processing axis of the blind hole 221 is perpendicular to the transverse rod 11 of the beam frame 1.

[0038] In some embodiments, a lifting ring 14 is provided on the top of the transverse rod 11 of the beam frame 1 , and the lifting ring 14 is located on the machining axis of the blind hole 221 on the ball portion 22 of the ball head rod 2 .

[0039] Further, combined with Figure 5 and Figure 6 As shown, the head mold 6 is a hemispherical body, including a downwardly facing hemispherical arc surface 61 and a top portion 62. The top portion 62 is provided with a hemispherical recess 621, into which the bottom of the ball portion 22 of the ball stud 2 is fixed. In one embodiment of the present invention, the plane of the top portion 62 of the head mold 6 is parallel to the transverse rod 11 of the beam frame 1, and the central axis of the hemispherical body of the head mold 6 coincides with the machining axis of the blind hole 221 in the ball portion 22 of the ball stud 2.

[0040] In some embodiments, combined Figure 5 and Figure 6As shown, a mounting boss 63 is provided on the top of the head mold 6, and the opening of the hemispherical recess 621 on the top of the head mold 6 is located in the mounting boss 63, and a plurality of first mounting holes 631 are provided on the mounting boss 63 that are evenly distributed around the opening of the hemispherical recess 621 on the top of the head mold 6. In one embodiment of the present invention, four first mounting holes 631 are evenly distributed at 90° are provided on the mounting boss 63.

[0041] Further, combined with Figure 7 and Figure 8 As shown, the pressing plate 4 is annular and includes a through hole 41 for passing the ball portion 22 of the ball stud 2 and a through slot 42 connected to one side of the through hole 41. The pressing plate 4 is provided with a plurality of second mounting holes 43 corresponding to the first mounting holes 631 on the mounting boss 63 on the top of the head mold 6. Screws are inserted through the first mounting holes 631 and the second mounting holes 43 to secure the pressing plate 4 to the mounting boss 63 on the top of the head mold 6, thereby securing the ball stud 2 in the hemispherical recess 621 of the head mold 6. In one embodiment of the present invention, the maximum diameter of the ball portion 22 of the ball stud 2 is designed to pass through the through hole 41 and the through slot 42 of the pressing plate 4.

[0042] Furthermore, the gasket 5 is arranged between the pressing plate 4 and the mounting boss 63 on the top of the head mold 6 and has the same shape as the pressing plate 4 .

[0043] In the rotatable fire helmet impact absorption performance testing device of the present invention, the transverse rod 11, longitudinal rod 12 and oblique reinforcement rib 13 of the beam frame 1 are aluminum profiles, the ball head rod 2 is made of aluminum alloy, the pressure plate 4 and the head mold 6 are aluminum alloy castings, and the gasket 5 is made of aluminum plate.

[0044] In the rotatable fire helmet impact absorption performance testing device of the present invention, the acceleration sensor 3 is, for example, a piezoelectric ceramic shear uniaxial sensor with a model number of 352C03 and a frequency of 0.5 to 10 kHz.

[0045] In the present invention's rotatable fire helmet impact absorption performance testing device, the contour heights and center-point distances of the hemispherical arc surface 61 of the head mold 6 meet the requirements of Appendix A of GB / T 2812-2006, "Test Methods for Safety Helmets." When using the present invention's rotatable fire helmet impact absorption performance testing device for acceleration testing of fire helmet impact absorption performance, the ball portion 22 of the ball head rod 2 can be flexibly rotated in all directions within the hemispherical recess 621 at the top of the head mold 6, achieving impact positioning of the fire helmet in four directions: the top, front, side, and back.

[0046] In the rotatable fire helmet impact absorption performance testing device of the present invention, the structure of the beam frame 1, the ball head rod 2, the pressure plate 4, the gasket 5 and the head mold 6 enables the acceleration sensor 3 to be located in the center of the head mold 6, reducing the influence of high-frequency noise generated by the vibration of the beam frame 1, the ball head rod 2 and the head mold 6, ensuring high precision of the test results and good repeatability. The entire test device is easy to adjust and simple to operate.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A rotatable fire helmet impact absorption performance testing device, characterized in that: It includes a beam frame, a ball head rod, an acceleration sensor and a head mold; wherein, The bottom of the beam is connected to the ball head rod; The ball head rod includes a connecting portion and a ball portion. The connecting portion is elongated and connected to the bottom of the beam frame. The ball portion is located at one end of the connecting portion. A blind hole is provided on the ball portion. An acceleration sensor is provided in the blind hole. The angle between the extending direction of the connecting portion and the machining axis of the blind hole is less than 90°. The head mold is a hemispherical body, comprising a downward hemispherical arc surface and a top, a hemispherical concave portion is provided on the top, and the bottom of the ball portion of the ball head rod is fixed in the hemispherical concave portion.

2. The rotatable fire helmet impact absorption performance testing device according to claim 1, characterized in that: The beam frame includes a transverse rod, a longitudinal rod and oblique reinforcement ribs, the transverse rod is located at the top of the beam frame, and the connecting part of the ball head rod is connected to the longitudinal rod and the end of the oblique reinforcement rib of the beam frame.

3. The rotatable fire helmet impact absorption performance testing device according to claim 2, characterized in that: The central axis of the hemispherical body of the head mold is perpendicular to the transverse rods of the beam frame, and the top plane of the head mold is parallel to the transverse rods of the beam frame.

4. The rotatable fire helmet impact absorption performance testing device according to claim 2, characterized in that: The machining axis of the blind hole on the ball portion of the ball head rod is perpendicular to the transverse rod of the beam frame and coincides with the central axis of the hemispherical body of the head mold.

5. The rotatable fire helmet impact absorption performance testing device according to claim 4, characterized in that: A lifting ring is provided on the top of the transverse rod of the beam frame, and the lifting ring is located on the processing axis of the blind hole on the ball part of the ball head rod.

6. The rotatable fire helmet impact absorption performance testing device according to claim 1, characterized in that: A mounting boss is provided on the top of the head mold, the opening of the hemispherical recess on the top of the head mold is located in the mounting boss, and a plurality of first mounting holes are provided on the mounting boss that are evenly distributed around the circumference of the opening of the hemispherical recess on the top of the head mold.

7. The rotatable fire helmet impact absorption performance testing device according to claim 6, characterized in that: It also includes a pressure plate, which is annular and includes a through hole for passing the ball part of the ball head rod and a through groove connected to one side of the through hole. Second mounting holes corresponding to several first mounting holes on the mounting boss on the top of the head mold are provided on the pressure plate. The pressure plate is fixed to the mounting boss on the top of the head mold by setting screws through the first mounting holes and the second mounting holes to fix the ball head rod in the hemispherical recess of the head mold.

8. The rotatable fire helmet impact absorption performance testing device according to claim 7, characterized in that: A gasket having the same shape as the pressing plate is provided between the pressing plate and the mounting boss on the top of the head mold.

9. The rotatable fire helmet impact absorption performance testing device according to claim 1, characterized in that: The acceleration sensor is a piezoelectric ceramic shear uniaxial sensor.