A fire helmet impact performance test device simulating high temperature and high humidity conditions in a fire scene

Abstract

The present invention provides a fire helmet impact performance test device under high temperature and high humidity conditions simulating a fire scene, which is composed of a base plate, a temperature and humidity simulation chamber, an impact system, a helmet fixing device, a traction system and a data acquisition system; the temperature and humidity simulation chamber and the impact system are installed on both sides of the upper surface of the base plate, and a guide rail located between the temperature and humidity simulation chamber and the impact system is provided on the upper surface of the base plate, and the traction system drives the helmet fixing device to slide on the guide rail. The present invention is used to test the lateral impact performance of fire helmets under high temperature and high humidity conditions in a fire scene, and has the characteristics of one machine for multiple uses. The device has a simple structure and is easy to adjust.

Description

Technical Field

[0001] The invention relates to a protective performance test of a fire helmet, and in particular to an impact performance test device for a fire helmet under high temperature and high humidity conditions simulating a fire scene. Background Art

[0002] Fire helmets are one of the important personal protective equipment for firefighters, and impact protection performance is a key technical indicator that determines the quality of fire helmet protection performance. At present, my country's fire helmet products are tested in accordance with the XF44-2015 "Fire Helmets" industry standard, mainly for impact protection performance tests at room temperature. Considering the high temperature and high humidity in the fire scene, a high temperature and high humidity on-site environment should be created to conduct impact tests on fire helmets, which is different from the normal temperature environment, so as to enhance the protection of firefighters.

[0003] As we all know, when firefighters are involved in firefighting, they are often in a high temperature and high humidity environment under the influence of fire and water spray. The same is true for helmets. The material properties of helmets will change under high temperature and high humidity conditions, and the performance will be greatly affected, especially when the helmets in high temperature conditions are suddenly poured with water (simulating the firefighters' helmets in the fire scene being poured with water from the water sprayers outside the scene). At this time, the helmets cool down rapidly, and the strength is greatly affected due to the principle of thermal expansion and contraction.

[0004] At present, foreign technologically advanced countries do not have equipment that can quickly carry out impact performance testing after high temperature and high humidity conditioning. Therefore, the development of a fire helmet impact performance test device that simulates high temperature and high humidity conditions in a fire scene will be able to better serve the testing of firefighters' equipment. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a test device for measuring the impact force when a head model wears a fire helmet under high temperature and high humidity conditions simulating a fire scene, so as to judge the performance of the fire helmet in harsh environments.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] A fire helmet impact performance test device under high temperature and high humidity conditions simulating a fire scene, comprising a base plate, a temperature and humidity simulation chamber, an impact system, a helmet fixing device, a traction system and a data acquisition system, wherein the temperature and humidity simulation chamber and the impact system are installed on both sides of the upper surface of the base plate, and a guide rail is provided on the upper surface of the base plate between the temperature and humidity simulation chamber and the impact system, and the helmet fixing device slides on the guide rail;

[0008] The temperature and humidity simulation chamber is provided with a closed cavity, a heating device and a water mist nozzle are provided in the closed cavity, a double-opening automatic door is provided on one side of the closed box, and one end of the guide rail extends into the closed cavity;

[0009] The impact system includes a bracket, a column, an electromagnet and an impact hammer. The column is cylindrical and stands on the bottom plate. The column is provided with a longitudinal row of adjustment holes. The vertical rod of the "L"-shaped bracket is slidably installed in the column and fixed with a latch. The lower surface of the horizontal rod of the bracket is provided with an electromagnet for magnetically adsorbing the impact hammer. A laser transmitter is installed on the column.

[0010] The helmet fixing device is composed of a head mold, a leg, a base, and a roller. The head mold is installed obliquely on the top of the leg, and a roller is provided under the base, and the roller is installed on the guide rail.

[0011] The traction system includes a servo motor, a chain and two sprockets, both ends of the chain are connected to the two sprockets in a transmission manner, the first sprocket is located in the temperature and humidity simulation chamber, the second sprocket is located at one end of the guide rail away from the temperature and humidity simulation chamber and the second sprocket is fixedly connected to the output shaft of the servo motor, the base is fixedly connected to the chain, and two through holes for the chain to pass through are provided at the closing part of the double-leaf automatic door;

[0012] The data acquisition system includes an impact force sensor, a charge amplifier, a data acquisition module and a computer. The lower end of the leg is conical and connected to the impact force sensor. The impact force sensor is electrically connected to the charge amplifier. The output end of the charge amplifier is connected to the input end of the data acquisition card. The output end of the data acquisition card is connected to the computer. The impact force sensor collects the impact force signal, amplifies it through the charge amplifier, and then the data acquisition card performs digital-to-analog conversion and processes and displays it on the computer.

[0013] Furthermore, the head mold is tilted 30 degrees and plugged and fixed on the top of the supporting leg.

[0014] Furthermore, an angle adjustment mechanism is provided at the top of the supporting leg, the head mold is fixedly mounted on the angle adjustment mechanism, and the angle adjustment mechanism has a locking device.

[0015] Furthermore, the helmet fixing device is made of all metal.

[0016] Furthermore, the head mold is arched.

[0017] Furthermore, the impact hammers with different weights and hammer head shapes are magnetically adsorbed on the lower surface of the bracket.

[0018] Furthermore, the heating device is an electric heating device or a gas-fired far-infrared radiation heating device.

[0019] Compared with the prior art, the present invention has the following obvious characteristics and advantages:

[0020] 1) The present invention is used to test the impact performance of fire helmets under high temperature conditions. It can not only simulate the damage to the helmet caused by the high temperature in the fire scene, but also test the impact protection performance of the helmet. It can be distinguished from other types of safety helmet tests, has fire protection characteristics, and is multi-purpose, simple in structure, and easy to adjust.

[0021] 2) The head mold can be rotated to flexibly test the impact performance of the front, side and rear of the helmet.

[0022] 3) A rotatable laser light is installed on the bracket to mark the impact point, so that we can quickly record the impact location;

[0023] 4) The data acquisition system uses impact force sensors with high sensitivity and short response time, and uses charge amplifiers with good amplification effects to process the output signals, thus ensuring high accuracy and good repeatability of the test results;

[0024] 5) The servo motor of the traction system is set outside the temperature and humidity simulation chamber to avoid damage to the servo motor caused by high temperature and high humidity environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is the structural diagram of the impact system;

[0028] Figure 3 This is a structural diagram of the helmet fixing device;

[0029] Figure 4 This is the structure diagram of the data acquisition system;

[0030] Description of reference numerals:

[0031] 1-temperature and humidity simulation chamber, 2-data acquisition system, 3-base plate, 3-1 guide rail, 4-helmet fixing device, 5-impact system, 6-rack, 7-column, 8-electromagnet, 9-impact hammer, 10-head mold, 11-leg, 12-base, 13-impact force sensor, 14-roller, 15-charge amplifier, 16-data acquisition card, 17-computer, 18-laser transmitter. DETAILED DESCRIPTION

[0032] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0033] In order to fully understand the present invention, detailed steps and detailed structures will be proposed in the following description to illustrate the technical solution of the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0034] Reference Figure 1-4 As shown, the present invention provides a fire helmet impact performance test device under high temperature conditions in a fire scene, and the device is mainly composed of a base plate 3, a temperature and humidity simulation chamber 1, an impact system 5, a helmet fixing device 4, a traction system and a data acquisition system 2. The temperature and humidity simulation chamber 1 and the impact system 5 are installed on both sides of the upper surface of the base plate 3, and a guide rail 3-1 is provided on the upper surface of the base plate 3 between the temperature and humidity simulation chamber 1 and the impact system 5, and the helmet fixing device 4 slides on the guide rail 3-1.

[0035] Temperature and humidity simulation chamber

[0036] The temperature and humidity simulation chamber uses electric heating or gas-fired far-infrared radiation heating to heat the chamber. There is a double-opening automatic door on the side close to the impact system. The heating temperature adjustment range is 30-80°C, the working temperature is 60°C, and the temperature accuracy is 0.1°C. There is also a water mist nozzle in the temperature and humidity simulation chamber. The water mist spray flow rate is 4L / min, which simulates the scene of a fire helmet under high temperature and high humidity conditions.

[0037] The double-leaf automatic door is used to facilitate the chain of the traction system to pass through the temperature and humidity simulation chamber without affecting the opening and closing of the door.

[0038] Impact system

[0039] The impact system includes a bracket 6, a column 7, an electromagnet 8 and an impact hammer 9. The column 7 is cylindrical and erected on the base plate 3. The column 7 is provided with a longitudinal row of adjustment holes. The vertical rod of the "L"-shaped bracket 6 is slidably installed in the column 7 and fixed with a pin. The lower surface of the cross rod of the bracket 6 is provided with an electromagnet 8 for magnetically adsorbing the impact hammer 9. A laser emitter 18 is installed on the column 7.

[0040] The lower surface of the bracket 6 can be magnetically adsorbed with impact hammers 9 of different weights and hammer head shapes. According to the test needs, the impact hammers 9 of corresponding specifications can be selectively hung on the lower surface of the bracket 6 to simulate different collision scenes and meet comprehensive test requirements.

[0041] The column 7 and the bracket 6 are both made of stainless steel, wherein the column 7 is 1.0 m high. The bracket 6 can move vertically on the column and is provided with a positioning pin hole and fixed by a positioning pin.

[0042] Helmet fixing device

[0043] like Figure 1-2 As shown, the helmet fixing device is composed of a head mold 10, a leg 11, and a base 12. The head mold 10 is tiltedly installed on the top of the leg 11. A roller 14 is provided under the base 12. The roller 14 is installed on the guide rail 3-1 of the bottom plate 3, so that the helmet fixing device can slide under the temperature and humidity simulation chamber 1 and the rack 6;

[0044] In one embodiment, the head mold 10 is tilted 30° and plugged and fixed on the top of the leg 11. In another embodiment, an angle adjustment mechanism is provided on the top of the leg 12, and the head mold 11 is fixedly mounted on the angle adjustment mechanism, and the angle adjustment mechanism has a locking knob such as a butterfly nut.

[0045] The head mold 10 is made of aluminum alloy, and its size conforms to the standard of GB / T 10000 "Human Body Size of Chinese Adults". The legs 11 are made of stainless steel, and their vertical height is 240 mm.

[0046] Traction system

[0047] The traction system includes a servo motor, a chain and two sprockets, the two ends of the chain are connected to the two sprockets, the first sprocket is located in the temperature and humidity simulation chamber 1, the second sprocket is located at the end of the guide rail 3-1 away from the temperature and humidity simulation chamber 1 and the second sprocket is fixedly connected to the output shaft of the servo motor, the base 12 is fixedly connected to the chain, and two through holes for the chain to pass through are provided at the closed part of the double-leaf automatic door. The servo motor drives the second sprocket to rotate, and under the joint action of the first and second sprockets, the chain is driven to rotate forward and reverse, so that the helmet fixing device enters or leaves the temperature and humidity simulation chamber. The servo motor model is 90CB075C.

[0048] Data Acquisition System

[0049] like Figure 4As shown, the data acquisition system includes an impact force sensor 13, a charge amplifier 15, a data acquisition module 16 and a computer 17. The lower end of the leg 11 is conical and connected to the impact force sensor 13. The impact force sensor is electrically connected to the charge amplifier 15. The output end of the charge amplifier 15 is connected to the input end of the data acquisition card 16. The output end of the data acquisition card 16 is connected to the computer 17. The impact force sensor 13 collects the impact force signal and amplifies it through the charge amplifier 15. The data acquisition card 16 performs digital-to-analog conversion and then processes and displays it on the computer 17. The model of the impact force sensor 13 is CM-1, the model of the charge amplifier 15 is YD-37, and the model of the data acquisition card 16 is PCI-9111.

[0050] The testing process of the present invention is as follows:

[0051] 1) Wear the helmet to be tested on the head mold 10. According to the marking light spot formed by the laser beam emitted by the laser transmitter 18 at the impact point of the helmet, adjust the inclination angle of the head mold 10 and the position of the helmet fixing device 2 on the base plate 10, so that the position where the impact hammer 9 contacts the helmet after vertically falling is at the ideal test point. The helmet fixing device 4 is driven into the temperature and humidity simulation chamber 1 by the servo motor and the sprocket chain, and the double-leaf automatic door is closed. When the double-leaf automatic door is closed, the chain passes through the two through holes of the double-leaf automatic door. Turn on the heating device or the humidifying device or both as needed to simulate the working environment of the helmet at high temperature, high temperature, or both high temperature and high humidity.

[0052] 2) Install the impact hammer 9 on the electromagnet. After the specified time, open the double-leaf automatic door, and pull the helmet fixing device 4 out of the temperature and humidity simulation chamber 1 to the bottom of the impact system 3 under the action of the traction system. Then the electromagnet 8 loses power, and the impact hammer 9 falls under the action of gravity and impacts the helmet at the marked light spot. The impact force is transmitted to the impact force sensor 13 through the head mold 10 and the support leg 11. The impact force signal collected by the impact force sensor 13 is amplified by the charge amplifier 15, and then processed and displayed by the computer 17 after digital-to-analog conversion by the data acquisition card 16. Observe with the naked eye whether the impact point is consistent with the marked light spot, then turn off the laser light, take a photo for storage, wait for the helmet to cool down after the impact, check the integrity of the helmet and prepare a performance test report.

[0053] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A fire helmet impact performance test device under high temperature and high humidity conditions simulating a fire scene, characterized in that: The device is composed of a base plate (3), a temperature and humidity simulation chamber (1), an impact system (5), a helmet fixing device (4), a traction system and a data acquisition system (2); the temperature and humidity simulation chamber (1) and the impact system (5) are installed on both sides of the upper surface of the base plate (3); a guide rail (3-1) is provided on the upper surface of the base plate (3) and is located between the temperature and humidity simulation chamber (1) and the impact system (5); and the helmet fixing device (4) slides on the guide rail (3-1); The temperature and humidity simulation chamber (1) is provided with a closed chamber, a heating device and a water mist nozzle are provided in the closed chamber, a double-opening automatic door is provided on one side of the closed chamber, and one end of the guide rail (3-1) extends into the closed chamber; The impact system comprises a hanger (6), a column (7), an electromagnet (8) and an impact hammer (9); the column (7) is cylindrical and erected on the bottom plate (3); the column (7) is provided with a row of adjustment holes in a longitudinal direction; the vertical rod of the "L"-shaped hanger (6) is slidably installed in the column (7) and fixed by a latch; the lower surface of the cross rod of the hanger (6) is provided with an electromagnet (8) for magnetically adsorbing the impact hammer (9); and a laser transmitter (18) is installed on the column (7); The helmet fixing device (4) is composed of a head mold (10), a support leg (11), a base (12), and a roller (14); the head mold (10) is installed obliquely on the top of the support leg (11); a roller (14) is provided under the base (12); and the roller (14) is installed on the guide rail (3-1); The traction system comprises a servo motor, a chain and two sprockets, the two ends of the chain are drivingly connected to the two sprockets, the first sprocket is located in the temperature and humidity simulation chamber (1), the second sprocket is located at one end of the guide rail (3-1) away from the temperature and humidity simulation chamber (1) and the second sprocket is fixedly connected to the output shaft of the servo motor, the base (12) is fixedly connected to the chain, and two through holes for the chain to pass through are provided at the closing position of the double-leaf automatic door; The data acquisition system comprises an impact force sensor (13), a charge amplifier (15), a data acquisition module (16) and a computer (17); the lower end of the leg (11) is conical and connected to the impact force sensor (13); the impact force sensor is electrically connected to the charge amplifier (15); the output end of the charge amplifier (15) is connected to the input end of the data acquisition card (16); the output end of the data acquisition card (16) is connected to the computer (17); the impact force signal collected by the impact force sensor (13) is amplified by the charge amplifier (15); the data acquisition card (16) performs digital-to-analog conversion, and the data is processed and displayed by the computer (17).

2. The fire helmet impact performance test device under high temperature and high humidity conditions of a simulated fire scene as claimed in claim 1, characterized in that: The head mold (10) is plugged and fixed on the top of the supporting leg (11) at an angle of 30 degrees.

3. The fire helmet impact performance test device under high temperature and high humidity conditions of a simulated fire scene as claimed in claim 1, characterized in that: An angle adjustment mechanism is provided at the top of the supporting leg (11), the head mold (10) is fixedly mounted on the angle adjustment mechanism, and the angle adjustment mechanism has a locking device.

4. The fire helmet impact performance test device under high temperature and high humidity conditions of a simulated fire scene as claimed in claim 1, characterized in that: The helmet fixing device (4) is made of all metal.

5. The fire helmet impact performance test device under the conditions of high temperature and high humidity in a simulated fire scene as claimed in claim 4, characterized in that: The head mold (10) is arched.

6. The fire helmet impact performance test device under high temperature and high humidity conditions of a simulated fire scene as claimed in claim 1, characterized in that: The impact hammers (9) of different weights and hammer head shapes are magnetically adsorbed on the lower surface of the hanger (4).

7. The fire helmet impact performance test device under high temperature and high humidity conditions of a simulated fire scene as claimed in claim 1, characterized in that: The heating device is an electric heating device or a gas-fired far-infrared radiation heating device.

Images