A device for preparing standard samples of burn marks

Abstract

This application provides a device for preparing standard samples of flaming weld lines. The device includes a flame generator, a support, and a heat insulation device. The support has a perforated support platform for supporting the wire to be melted. The flame generator is located below the support platform, and the flame generated by the flame generator can pass through the support platform and act on the wire to be melted. The heat insulation device has a heat insulation cavity with an opening at the bottom, and the heat insulation device can cover the support platform so that the wire to be melted is located inside the heat insulation cavity. The flame generated by the flame generator passes through the perforated support platform and acts on the wire, realistically simulating the direct burning scenario of flames in an actual fire. The semi-enclosed heat insulation of the heat insulation device reduces the indiscriminate loss of heat to the external environment, limits the excessive oxidation of the wire due to the enclosed space, and ensures that the weld line formation process is close to that of a real fire, solving the problem of poor consistency of weld line characteristics in existing devices.

Description

Technical Field

[0001] This application relates to the field of fire protection technology, and in particular to an apparatus for preparing standard samples of fire burn marks. Background Technology

[0002] Fire-induced molten trace preparation refers to the process in fire investigations where a simulated fire environment is used to melt a metal wire under flame or high temperature, forming specific traces. This is primarily used to analyze the cause of a fire. Existing simulation experimental devices employ either overall heating and insulation of the metal wire, or localized high-temperature melting of the metal wire without insulation, to prepare fire-induced molten traces. Overall heating and insulation easily leads to overall oxidation of the molten trace, while localized heating without insulation easily leads to rapid cooling of the molten trace. Since both methods differ from the actual flame combustion scenario of a fire, the resulting molten traces have poor consistency with the actual fire scene, failing to meet the needs of forensic identification and comparison, and scientific research. Utility Model Content

[0003] The purpose of this application is to provide a device for preparing standard samples of fire-induced melt marks, thereby solving the problem in the prior art where the prepared fire-induced melt mark samples have poor consistency with actual fire scenarios, failing to meet the needs of forensic identification and research. The specific technical solution is as follows:

[0004] This application provides a device for preparing standard samples of flaming melt marks, which includes: a flame generator, a support, and a heat preservation device;

[0005] The bracket has a hollow support platform for supporting the wire to be melted;

[0006] The flame generator is located below the support platform, and the flame generated by the flame generator can pass through the support platform and act on the wire to be melted;

[0007] The heat preservation device has a heat preservation cavity with an opening at the bottom. The heat preservation device can be placed on the support platform so that the wire to be melted is located inside the heat preservation cavity.

[0008] In some embodiments, the flame generator is internally equipped with a fuel storage tank module, a fuel control valve module, and an ignition system module; the fuel storage tank module is used to store fuel, the fuel control valve module is used to control the temperature and height of the flame, and the ignition system module uses electronic ignition.

[0009] In some embodiments, the heat preservation device is equipped with a thermocouple, which is used to detect the temperature of the heat preservation device in real time and feed it back to the fuel control valve module; the fuel control valve module controls the temperature and height of the flame based on the temperature of the heat preservation device fed back by the thermocouple.

[0010] In some embodiments, the ignition system module includes a flame monitoring component that can automatically cut off the fuel supply to the fuel storage tank module and issue a warning signal when the flame is detected to be unexpectedly extinguished.

[0011] In some embodiments, the heat insulation device includes a heat-conducting layer, a heat-insulating layer, and an outer shell layer from the inside out. The heat-conducting layer is made of molybdenum foil, the heat-insulating layer includes fireproof bricks and alumina fiberboard, and the outer shell layer is made of metal.

[0012] In some embodiments, the carrier platform is provided with a wire fixing component, which can fix the wire to be melted.

[0013] In some embodiments, the support further includes a support member for supporting the carrying platform, the height of the support member being higher than the height of the flame generator.

[0014] In some embodiments, the top of the insulation device is provided with a smoke exhaust channel, which is connected to the insulation cavity.

[0015] In some embodiments, the heat preservation device and / or the flame generator have handles on their side walls.

[0016] In some embodiments, the flame generator is provided with rollers at its bottom.

[0017] Beneficial effects of the embodiments in this application:

[0018] The fire-induced melting mark standard sample preparation device provided in this application embodiment has an opening at the bottom of the insulation device, allowing the flame generated by the flame generator to pass through the hollow support platform and act on the wire, which can realistically simulate the scene of direct burning by flames in an actual fire. Moreover, the semi-enclosed insulation design of the insulation device can reduce the indiscriminate loss of heat to the external environment, while limiting the excessive oxidation of the wire due to the enclosed space, ensuring that the melting mark formation process is close to that of a real fire. This solves the problem of poor consistency of melting mark characteristics in existing devices and can meet the needs of physical evidence identification and comparison and scientific research.

[0019] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0021] Figure 1An overall isometric view of the flame melt mark standard sample preparation apparatus provided in the embodiments of this application;

[0022] Figure 2 for Figure 1 A perspective view of the apparatus for preparing standard samples with burn marks shown;

[0023] Figure 3 for Figure 1 Top view of the apparatus for preparing standard samples with flaming melt marks shown;

[0024] Figure 4 for Figure 3 The cross-sectional view along the DD direction of the apparatus for preparing standard samples with burn marks shown.

[0025] Figure 5 for Figure 1 The isometric view of the heat preservation device in the apparatus for preparing standard samples with flaming melt marks shown.

[0026] Figure 6 for Figure 1 A side view of the apparatus for preparing standard samples with flaming melt marks shown.

[0027] Figure 7 for Figure 6 The diagram shows a cross-sectional view of the apparatus for preparing standard samples with burn marks along line AA.

[0028] Figure label:

[0029] Flame generator 100; bracket 200; bearing platform 210; support component 220; heat insulation device 300; heat-conducting layer 301; heat insulation layer 302; outer shell layer 303; heat insulation cavity 310; opening 320; smoke exhaust channel 400; handle 500; fixing frame 600. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.

[0031] This application provides an apparatus for preparing standard samples of flaming melt marks, see [link]. Figures 1 to 5 , Figure 1 An overall isometric view of the flame melt mark standard sample preparation apparatus provided in the embodiments of this application; Figure 2 for Figure 1 A perspective view of the apparatus for preparing standard samples with burn marks shown; Figure 3 for Figure 1 Top view of the apparatus for preparing standard samples with flaming melt marks shown; Figure 4 for Figure 3 The cross-sectional view along the DD direction of the apparatus for preparing standard samples with burn marks shown. Figure 5 for Figure 1 The diagram shows an isometric view of the heat preservation device in the flame smear standard sample preparation apparatus. The flame smear standard sample preparation apparatus includes: a flame generator 100, a support 200, and a heat preservation device 300. The support 200 has a hollowed-out support platform 210, which is used to support the wire to be melted. The flame generator 100 is located below the support platform 210, and the flame generated by the flame generator 100 can pass through the support platform 210 and act on the wire to be melted. The heat preservation device 300 has a heat preservation cavity 310, and the bottom of the heat preservation device 300 has an opening 320. The heat preservation device 300 can cover the support platform 210 so that the wire to be melted is located inside the heat preservation cavity 310.

[0032] The fire-induced melting mark standard sample preparation device provided in this application embodiment has an opening 320 at the bottom of the heat preservation device 300, which allows the flame generated by the flame generator 100 to pass through the hollow support platform 210 and act on the wire, thus realistically simulating the scene of direct burning by flames in an actual fire. Furthermore, the semi-enclosed heat preservation design of the heat preservation device 300 can reduce the indiscriminate loss of heat to the external environment, reduce heat loss, and ensure that the heat released by the complete combustion of fuel is efficiently transferred to the wire to be melted. At the same time, it limits the excessive oxidation of the wire due to the enclosed space, ensuring that the melting mark formation process is close to that of a real fire. This solves the problem of poor consistency of melting mark characteristics in existing devices and can meet the needs of physical evidence identification and comparison and scientific research.

[0033] In this embodiment, since the device can more realistically and accurately reproduce the actual fire environment, this simulation condition that closely matches the actual fire can directly ensure the consistency between the melt mark formation process and the actual fire scene. Therefore, the prepared fire melt marks are more prominent in key features such as morphology, microstructure, and composition distribution, and the feature recognition is significantly improved, which can more accurately match the real state of melt marks in actual fires.

[0034] It should be noted that the type of wire to be fused is selected according to the experimental requirements, and can be copper wire or aluminum wire, etc. This application does not limit the type of wire; the support is a high temperature resistant support, and the material can be metal materials such as steel alloy.

[0035] The shape of the support platform 210 can be a rectangular or circular hollow plate. This application does not limit the shape of the support platform 210. In an optional embodiment, the cross-sectional dimensions of the support platform 210 can be 1000mm*1000mm.

[0036] The shape of the heat preservation device 300 can be selected according to actual needs. For example, the heat preservation device selected in this application embodiment is a rectangular cover with an inner cavity size of 740mm×740mm×740mm. This application does not limit the shape, model, or size of the heat preservation device.

[0037] In this embodiment, the flame generator 100 internally includes a fuel storage tank module, a fuel control valve module, and an ignition system module (not shown). The fuel storage tank module stores fuel, the fuel control valve module controls the flame temperature, height, and combustion duration to realistically reproduce the flame combustion scene, and the ignition system module uses electronic ignition. The fuel storage tank module can store different types of fuel, and the fuel control valve module can adjust the fuel flow rate and oxygen supply according to actual needs to meet the melting requirements of different metal materials such as aluminum and copper, further improving the consistency of the prepared fire-marked traces in the same batch. The electronic ignition system is safer and more reliable than traditional open flame ignition. In this embodiment, by selecting different types of fuel and adjusting the ambient temperature of the combustion scene, the required temperature for different metal wires such as copper and aluminum to be melted by fire is achieved. In this way, the process of electrical components such as copper and aluminum wires being heated and forming fire-marked traces in a fire scene is reproduced, and fire-marked trace samples are prepared. This provides accurate comparison samples for fire evidence identification and standard samples for conducting research on fire evidence identification technology.

[0038] Specifically, the fuel storage tank module can be made of corrosion-resistant, sealed bottles. The fuel can be a mixture of ethanol and gasoline, pure ethanol, pure gasoline, diesel, or kerosene, for example, 92-octane gasoline containing 10% ethanol.

[0039] In one exemplary operating method:

[0040] S1; Set the fuel to 6L of 92-octane gasoline containing 10% ethanol, and inject the fuel into the flame generator fuel storage tank module;

[0041] S2: Place several copper wires on the bracket, and place an insulation device on top of the bracket;

[0042] S3: Start the flame generator to ensure complete combustion of the fuel and form a stable high-temperature flame.

[0043] S4: A high-temperature flame comes into contact with the copper wire inside the heat preservation device, and melts it under the action of the high-temperature flame, thus creating a burn mark on the copper wire.

[0044] S5: Repeat the burning experiment in the above order to prepare a certain number of copper wire burning marks.

[0045] In some other embodiments, the flame generator 100 can be replaced by an alcohol torch or a natural gas burner. This application does not limit the type of flame generator 100.

[0046] Furthermore, a thermocouple (not shown) is installed inside the insulation device 300. The thermocouple is used to monitor the temperature of the insulation device 300 in real time and feed it back to the fuel control valve module. The fuel control valve module controls the temperature and height of the flame based on the temperature of the insulation device 300 fed back by the thermocouple. The linkage between the thermocouple and the fuel control valve module can improve the temperature control accuracy of the insulation cavity 310 and minimize the differences in the internal microstructure of the melt line caused by temperature fluctuations. The system automatically maintains a stable temperature without requiring operators to frequently observe the flame or adjust parameters, reducing the difficulty of operation and thus improving experimental efficiency.

[0047] Specifically, the thermocouple is a high-temperature resistant thermocouple, capable of monitoring a maximum temperature range of 1000℃ to 2000℃.

[0048] Furthermore, the ignition system module includes a flame monitoring component that automatically cuts off the fuel supply to the fuel storage tank module and issues a warning signal when it detects accidental flameout. The flame monitoring component's ability to identify flameout and automatically cut off the fuel supply enhances safety and reliability.

[0049] Specifically, the flame monitoring component can be an ultraviolet flame sensor, and this application does not limit the type and model of the flame monitoring component.

[0050] Based on all the above embodiments, such as Figure 2 As shown, the insulation device 300 includes a heat-conducting layer 301, an insulation layer 302, and an outer shell layer 303 from the inside out. The heat-conducting layer 301 can be made of molybdenum foil, the insulation layer 302 includes fireproof bricks and alumina fiberboard, and the outer shell layer 303 is made of metal. The heat-conducting layer 301 uses a high-strength, easily heat-conducting material such as molybdenum foil. The inner layer of molybdenum foil can withstand temperatures above 1200℃ and conducts heat uniformly. The middle layer of fireproof bricks and alumina fiberboard composite insulation layer 302 can effectively reduce heat loss. The outer metal shell ensures structural strength. The high-strength, easily heat-conducting material can prevent the flame from directly contacting the insulation material of the insulation layer 302, improving the temperature control effect of the insulation device, and effectively retaining the heat generated by the flame combustion within the insulation device.

[0051] It should be noted that in some other embodiments, the material of the heat-conducting layer 301 may also be tungsten foil, tantalum foil, etc. This application does not limit the material of the heat-conducting layer 301.

[0052] Based on all the above embodiments, the support platform 210 is provided with a wire fixing component (not shown in the figure), which can fix the wire to be melted. By fixing the wire to be melted with the wire fixing component, the displacement of the wire to be melted due to flame impact or thermal expansion during the heating process can be minimized, ensuring that the flame always acts on the preset section of the wire to be melted, improving the accuracy of melt mark preparation, and reducing experimental errors caused by positional deviations.

[0053] It should be noted that the fixing method of the wire fastener can be adjusted according to the length and diameter of the wire. Optionally, the wire fastener can be a fixing bracket 600, which is fixedly installed at the opening 320 of the insulation device 300. When the insulation device 300 covers the support 200, the fixing bracket 600 can apply a downward force to the wire to be fused, thereby fixing the wire to be fused. This application does not limit the shape and fixing method of the wire fastener.

[0054] Based on all the above embodiments, such as Figure 1 and Figure 2 As shown, the bracket 200 also includes a support member 220, which is used to support the bearing platform 210. The height of the support member 220 is higher than the height of the flame generator 100. The specific dimensions of the support member 220 can be set according to the height of the flame generator 100. This application does not limit the dimensions of the support member 220.

[0055] In some other embodiments, the support 200 may consist only of the support platform 210 without the support member 220, and the support platform 210 may be attached to the flame generator 100.

[0056] Based on all the above embodiments, such as Figure 2 , Figure 6 and Figure 7 As shown, Figure 6 for Figure 1 A side view of the apparatus for preparing standard samples with flaming melt marks shown. Figure 7 for Figure 6 The diagram shows a cross-section along line AA of the flame trace standard sample preparation apparatus. The top of the insulation device 300 has a smoke exhaust channel 400, which connects to the insulation cavity 310. The smoke exhaust channel 400 promptly removes smoke, reducing its retention within the insulation cavity 310 and preventing contamination of the flame trace by impurities. This ensures the purity of the flame trace and meets the requirements for subsequent precision testing (such as component analysis and microstructure observation). Furthermore, the smoke exhaust channel 400 maintains stable pressure within the insulation cavity 310, balancing the pressure and reducing the impact of pressure fluctuations on flame stability, thus ensuring the stability of the flame trace formation process.

[0057] Based on all the above embodiments, a handle 500 is provided on the side wall of the heat preservation device 300 and / or the flame generator 100. This facilitates the operator in adjusting the position of the flame generator 100 and the heat preservation device 300.

[0058] Based on all the above embodiments, the flame generator 100 is equipped with rollers (not shown). By providing rollers, it is easier and faster to move the flame generator 100, thereby improving the efficiency of experimental operations.

[0059] In some other embodiments, the bottom of the flame generator 100 may not be equipped with rollers.

[0060] 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0061] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0062] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A firebrand standard sample preparation device, characterized by, include: Flame generator (100), support frame (200), and insulation device (300); The bracket (200) has a hollowed-out support platform (210) for supporting the wire to be fused; The flame generator (100) is located below the support platform (210), and the flame generated by the flame generator (100) can pass through the support platform (210) and act on the wire to be melted; The heat preservation device (300) has a heat preservation cavity (310) and an opening (320) at the bottom. The heat preservation device (300) can be placed on the support platform (210) so that the wire to be melted is located in the heat preservation cavity (310).

2. The apparatus for preparing standard samples with flaming weld marks according to claim 1, characterized in that, The flame generator (100) is equipped with a fuel storage tank module, a fuel control valve module and an ignition system module; the fuel storage tank module is used to store fuel, the fuel control valve module is used to control the temperature and height of the flame, and the ignition system module adopts electronic ignition.

3. The firebrand standard sample preparation device of claim 2, wherein, The insulation device (300) is equipped with a thermocouple, which is used to detect the temperature of the insulation device (300) in real time and feed it back to the fuel control valve module; The fuel control valve module controls the temperature and height of the flame based on the temperature feedback from the thermocouple and the insulation device (300).

4. The apparatus for preparing standard samples with flaming weld marks according to claim 2, characterized in that, The ignition system module includes a flame monitoring component, which can automatically cut off the fuel supply to the fuel storage tank module and issue a warning signal when the flame is detected to be unexpectedly extinguished.

5. The apparatus for preparing standard samples with flaming weld marks according to any one of claims 1-4, characterized in that, The heat insulation device (300) includes a heat-conducting layer (301), a heat insulation layer (302), and an outer shell layer (303) from the inside out. The heat-conducting layer (301) is made of molybdenum foil, the heat insulation layer (302) includes fireproof bricks and alumina fiberboard, and the outer shell layer (303) is made of metal.

6. The apparatus for preparing standard samples with flaming weld marks according to any one of claims 1-4, characterized in that, The support platform (210) is provided with a wire fixing component, which can fix the wire to be melted.

7. The apparatus for preparing standard samples with flaming weld marks according to any one of claims 1-4, characterized in that, The bracket (200) also includes a support member (220) for supporting the bearing platform (210), and the height of the support member (220) is higher than the height of the flame generator (100).

8. The apparatus for preparing standard samples with flaming weld marks according to any one of claims 1-4, characterized in that, The top of the heat preservation device (300) is provided with a smoke exhaust channel (400), which is connected to the heat preservation cavity (310).

9. The apparatus for preparing standard samples with flaming weld marks according to any one of claims 1-4, characterized in that, The heat preservation device (300) and / or the flame generator (100) are provided with handles (500) on their side walls.

10. The apparatus for preparing standard samples with flaming weld marks according to any one of claims 1-4, characterized in that, The flame generator (100) is equipped with rollers at its bottom.

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