Short-circuit melting mark preparation device and preparation method

Abstract

The embodiment of the invention provides a short-circuit melting mark preparation device and method.The short-circuit melting mark preparation device comprises a furnace body, a heating assembly, a sample injection assembly, a first wire, a second wire and a collection pipeline, the furnace body is provided with a smoke inlet and a smoke outlet, the side wall of the furnace body is provided with a first sample injection port and a second sample injection port, and the heating assembly is arranged on the furnace body; the heater is used for heating the hearth to preset temperature; the sample injection assembly comprises a first line pipe, a second line pipe and a driving part, the first line pipe and the second line pipe penetrate through the first sample injection port and the second sample injection port, the first line pipe and the second line pipe are rigid pipes, and the driving part is used for driving at least one of the first line pipe and the second line pipe to move so that the first line pipe and the second line pipe can get close to each other or get away from each other; the first wire penetrates through the first wire pipe, the second wire penetrates through the second wire pipe, and when the first wire pipe and the second wire pipe are close to each other, the first wire and the second wire touch each other and are short-circuited; one end of the collecting pipeline communicates with the hearth, and melting marks generated after the wire is short-circuited fall into the collecting pipeline.

Description

Technical Field

[0001] The present application relates to the field of fire protection technology, and in particular to a short-circuit melting mark preparation device and preparation method. Background Art

[0002] Electrical fire refers to the heat energy released due to faults in electrical circuits, electrical equipment, appliances, and power supply and distribution equipment; such as high temperature, electric arcs, electric sparks, and non-fault released energy; such as the hot surface of electric heating appliances, which ignites the body or other combustibles under combustion conditions. According to fire statistics, electrical fires are the main category of fire statistics, among which short circuits are the most serious form of faults that cause major electrical fires. Therefore, it is very important to prepare and study the melting marks of wire short circuits under different fire environments.

[0003] In the existing technology for preparing short-circuit melt marks, under the same experimental environment simulating a fire, only a single sample melt mark can be obtained, but repeated melt marks in batches cannot be obtained, resulting in poor consistency and reproducibility of the melt mark samples. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a short-circuit melting mark preparation device and preparation method, which can solve the problem of poor consistency and reproducibility of short-circuit melting mark samples in the prior art. The specific technical solution is as follows:

[0005] The first aspect of the present application provides a short-circuit melt mark preparation device, comprising a furnace body, a heating component, an injection component, a first wire and a second wire, and a collecting pipe, wherein the furnace body has a hollow furnace chamber, the furnace body has a smoke inlet and a smoke outlet, and the side wall of the furnace body is provided with a first injection port and a second injection port; the heating component is arranged on the furnace body, and is used to heat the furnace chamber to a preset temperature; the injection component comprises a first wire tube and a second wire tube and a driving member which are inserted into the first injection port and the second injection port, the first wire tube and the second wire tube are rigid tubes, and the driving member is used to drive at least one of the first wire tube and the second wire tube to move so that the first wire tube and the second wire tube are close to or away from each other; the first wire is inserted into the first wire tube, and the second wire is inserted into the second wire tube, and when the first wire tube and the second wire tube are close to each other, the first wire and the second wire touch and short-circuit; one end of the collecting pipe is connected to the furnace chamber, and the melt mark after the first wire and the second wire are short-circuited falls into the collecting pipe.

[0006] In some embodiments, the distance between the first injection port and the second injection port is 15 cm-30 cm.

[0007] In some embodiments, the injection assembly further includes an adjustment key, the driving member includes a motor and a driving rod, the driving rod is connected to one of the first wire tube and the second wire tube, and the adjustment key is used to adjust the advancement speed of the motor.

[0008] In some embodiments, the short-circuit melt mark preparation device also includes a controller, the heating assembly includes a heater and a temperature detector, the controller is electrically connected to the heater and the temperature detector, the heater is arranged on the side wall of the furnace body, and the temperature detector is arranged on the inner wall of the top of the furnace body. When the temperature detector detects that the temperature reaches a preset temperature, the controller controls the heater to stop heating and enter a heat preservation state.

[0009] In some embodiments, the short-circuit melt mark preparation device also includes a smoke detection component, which is arranged on the inner wall of the furnace body, the smoke inlet is connected to a smoke inlet pipe, and the smoke inlet pipe is provided with an air intake valve. The smoke detection component and the air intake valve are electrically connected to the controller. When the smoke detection component detects that the smoke density in the furnace reaches a preset value, the controller controls the air intake valve to close.

[0010] In some embodiments, the smoke detection assembly includes a light emitter and a light receiver, and the light emitter and the light receiver are disposed on opposite inner walls of the furnace body.

[0011] In some embodiments, the short-circuit melt mark preparation device also includes a fan arranged on the smoke inlet duct.

[0012] In some embodiments, the smoke outlet is disposed at the top of the furnace body, the smoke outlet is connected to a smoke outlet pipe, an exhaust valve is disposed on the smoke outlet pipe, and the smoke inlet is located below the first sample inlet and the second sample inlet.

[0013] In some embodiments, the collecting pipe includes a first part and a second part that are connected to each other, the first part is connected to the furnace and is funnel-shaped, the axial direction of the first part is consistent with the height direction of the furnace body, the cross-sectional area of ​​the first part decreases successively in the direction away from the furnace, and the cross-sectional area of ​​the second part is equal to the cross-sectional area at the connection with the first part.

[0014] In some embodiments, the second portion is bent relative to the first portion so that the end of the second portion is perpendicular to the axial direction of the first portion, and a movable baffle is provided at the outlet of the collection pipe.

[0015] In some embodiments, a viewing window is further provided on the furnace body, and a side wall where the viewing window is located is opposite to a side wall of the furnace body where the first injection port and the second injection port are located.

[0016] The embodiment of the second aspect of the present application provides a method for preparing a short-circuit melt mark, comprising:

[0017] S1: The controller controls the heater to heat. After the temperature detector detects that the furnace has reached the preset temperature, the controller controls the heater to stop heating and enter the insulation state.

[0018] S2: Open the air inlet valve on the smoke inlet pipe, and the smoke enters the furnace through the smoke inlet. When the smoke detection component detects that the smoke density in the furnace reaches the preset density, the air inlet valve is closed.

[0019] S3: Extend the first wire and the second wire from the first wire tube and the second wire tube into the furnace and place them for a preset time.

[0020] S4: After the preset time is reached, the driving component drives at least one of the first wire tube and the second wire tube to move, energizes the first wire and the second wire, and the first wire tube and the second wire tube drive the first wire and the second wire to approach each other until the first wire and the second wire touch and short-circuit.

[0021] S5: The melting mark after the short circuit between the first and second conductors falls into the collection pipe.

[0022] In the embodiment of the present application, the furnace provides an operating space for simulating the short circuit process of the wire, smoke is introduced into the furnace through the smoke inlet, and the furnace is heated by the heating component so that the furnace can reach a preset temperature, so that the furnace can simulate the high temperature and smoke environment of the fire scene, and thus the wire melt marks prepared in the preparation device can be consistent with the wire melt marks at the real fire scene to the greatest extent. The first wire tube and the second wire tube extend into the furnace from the outside of the furnace body through the first injection port and the second injection port. In the process of the driving member driving the first wire tube and the second wire tube to approach each other, the first wire and the second wire will also approach each other and can contact and short-circuit under the drive of the first wire tube and the second wire tube. Since the first wire and the second wire can be continuously extended from the outside through the first wire tube and the second wire tube, the short-circuit melt marks under the same environment can be continuously prepared, thereby improving the consistency and reproducibility of the short-circuit melt marks of the same batch. In the embodiment of the present application, the first wire tube and the second wire tube are rigid tubes. On the one hand, the flexibility of the wire is relatively large, so the first wire tube and the second wire tube can play a good supporting role for the first wire and the second wire, and it is convenient to control the position repeatability of the first wire and the second wire each time they contact the short circuit, so as to obtain a short-circuit melt mark sample with good repeatability. On the other hand, the first wire tube and the second wire tube can protect the first wire and the second wire, and prevent the first wire and the second wire from directly contacting the side wall of the furnace body and causing wear of the first wire and the second wire. The first wire tube and the second wire tube can also control the distance that the first wire and the second wire extend each time, so as to control the length of the melt mark sample after the first wire and the second wire touch the short circuit to be more uniform, further improve the repeatability of the short-circuit melt mark sample, and by reasonably designing the length of the short-circuit melt mark sample, it can also achieve the effect of saving the use of the first wire and the second wire.

[0023] After the first wire and the second wire are short-circuited to obtain different melting marks, the melting marks fall from the furnace into the collecting pipe. After completing the experiment, the user can take the melting marks from the collecting pipe for comparative study.

[0024] Of course, implementing any product or method of the present application does not necessarily require achieving all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, 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 application, and for ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0026] Figure 1 A perspective view of a short-circuit melt mark preparation device provided in an embodiment of the present application;

[0027] Figure 2 A rear view of a short-circuit melt mark preparation device provided in an embodiment of the present application;

[0028] Figure 3 A schematic diagram of the injection assembly provided in an embodiment of the present application.

[0029] Reference numerals:

[0030] Furnace body 1; furnace 10; smoke inlet 11; smoke inlet pipe 110; air inlet valve 111; smoke outlet 12; smoke outlet pipe 120; first sample inlet 13; second sample inlet 14; first wire pipe 21; second wire pipe 22; collecting pipe 30; first part 31; second part 32; baffle 320; driving member 40; motor 41; driving rod 42; heating assembly 50; heater 51; smoke detection assembly 60; light emitter 61; light receiver 62; window 70; handle 71. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field based on the present application belong to the scope of protection of the present application.

[0032] The first aspect of the present application provides a short-circuit melting mark preparation device, such as Figure 1 , Figure 2 and Figure 3 As shown, the short-circuit melting mark preparation device includes a furnace body 1, a heating component 50, a sampling component, a first wire and a second wire, and a collecting pipe 30. The furnace body 1 has a hollow furnace 10, the furnace body 1 has a smoke inlet 11 and a smoke outlet 12, and a first sampling port 13 and a second sampling port 14 are arranged on the side wall of the furnace body 1; the heating component 50 is arranged on the furnace body 1, and is used to heat the furnace 10 to a preset temperature; the sampling component includes a first wire tube 21 and a second wire tube 22 and a driving member 40 that are inserted into the first sampling port 13 and the second sampling port 14. The first wire tube 21 and the second wire tube 22 are rigid tubes, and the driving member 40 is used to drive at least one of the first wire tube 21 and the second wire tube 22 to move so that the first wire tube 21 and the second wire tube 22 are close to or away from each other; the first wire is passed through the first wire tube 21, and the second wire is passed through the second wire tube 22. When the first wire tube 21 and the second wire tube 22 are close to each other, the first wire and the second wire touch and short-circuit; one end of the collecting pipe 30 is connected to the furnace 10, and the melting mark after the first wire and the second wire are short-circuited falls into the collecting pipe 30.

[0033] In the embodiment of the present application, the furnace 10 provides an operating space for simulating the short circuit process of the wire. Smoke is introduced into the furnace 10 through the smoke inlet 11, and the furnace 10 is heated by the heating component 50 so that the furnace 10 can reach a preset temperature, so that the furnace 10 can simulate the high temperature and smoke environment of the fire scene, and thus the wire melting marks prepared in the preparation device can be consistent with the wire melting marks of the real fire scene to the greatest extent. The first wire tube 21 and the second wire tube 22 extend into the furnace 10 from the outside of the furnace body 1 through the first injection port 13 and the second injection port 14. In the process of the driving member 40 driving the first wire tube 21 and the second wire tube 22 to approach each other, the first wire and the second wire will also approach each other and can contact and short-circuit under the drive of the first wire tube 21 and the second wire tube 22. Since the first wire and the second wire can be continuously extended from the outside through the first wire tube 21 and the second wire tube 22, the short-circuit melting marks under the same environment can be continuously prepared, and the consistency and reproducibility of the short-circuit melting marks of the same batch are improved. In the embodiment of the present application, the first wire tube 21 and the second wire tube 22 are rigid tubes. On the one hand, the flexibility of the wire is relatively large, so the first wire tube 21 and the second wire tube 22 can play a good supporting role for the first wire and the second wire, and it is convenient to control the position repeatability of the first wire and the second wire each time they contact the short circuit, so as to obtain a short-circuit melt mark sample with good repeatability. On the other hand, the first wire tube 21 and the second wire tube 22 can protect the first wire and the second wire, and prevent the first wire and the second wire from directly contacting the side wall of the furnace body 1, resulting in wear of the first wire and the second wire. The first wire tube 21 and the second wire tube 22 can also control the distance that the first wire and the second wire extend each time, so as to control the length of the melt mark sample after the first wire and the second wire touch the short circuit to be more uniform, further improve the repeatability of the short-circuit melt mark sample, and by reasonably designing the length of the short-circuit melt mark sample, it can also achieve the effect of saving the use of the first wire and the second wire.

[0034] After the first wire and the second wire touch and short-circuit, the first wire and the second wire at the short-circuit position are disconnected to form a short-circuit melt mark, and separate from the original first wire and the second wire. The melt mark falls from the furnace 10 into the collecting pipe 30. After completing the experiment, the user can take the melt mark from the collecting pipe 30 for comparative study.

[0035] In the actual preparation process, the connection direction of the first injection port 13 and the second injection port 14 can be horizontal, so the initial direction of the first wire tube 21 and the second wire tube 22 is also horizontal and parallel to each other. The driving member 40 can drive the first wire tube 21 or the second wire tube 22 to move, or can drive the first wire tube 21 and the second wire tube 22 to move at the same time. When only one of the wire tubes is driven to move, there is only one driving member 40, and when two wire tubes are driven to move, there are two driving members 40. Take only one driving member 40 as an example for explanation. The driving member 40 drives the first wire tube 21 to move relative to the second wire tube 22. When the first wire and the second wire extend at the same distance, by controlling the movement distance of the first wire tube 21 each time, the contact position of the first wire and the second wire can be controlled to remain unchanged each time, that is, the front end of the first wire and the second wire contacts at the same preset angle a each time, so that the short-circuit melt mark samples prepared are consistent. It should be noted that the preset angle a can be different angle values ​​according to the preparation requirements. The first wire and the second wire touch the short circuit at different angles a, and different short-circuit melt marks can be obtained.

[0036] The first wire pipe 21 and the second wire pipe 22 can be made of metal materials such as stainless steel. Metal materials have good thermal stability. Using metal materials to make the first wire pipe 21 and the second wire pipe 22 can prevent the first wire pipe 21 and the second wire pipe 22 from being corroded by high temperature, thereby increasing the service life of the first wire pipe 21 and the second wire pipe 22.

[0037] Specifically, the smoke inlet 11 may also be connected to a combustion furnace (not shown) for providing smoke, and different substances may be burned in the combustion furnace to simulate fire scenes of different scenes. The amount of smoke intake may be controlled by the degree of combustion in the combustion furnace.

[0038] The first wire and the second wire may be a copper wire and an aluminum wire respectively. The outer wall of the furnace body 1 may be composed of a heat-insulating material and a metal shell. For example, the heat-insulating material may be an alumina fiberboard.

[0039] It should be noted that, the furnace 10 can be heated by only the heater 51 without introducing smoke through the smoke inlet 11, that is, only simulating the high-temperature and smoke-free environment of the fire scene; the heater 51 can also be omitted, and only smoke can be introduced through the smoke inlet 11, that is, only simulating the high-smoke and low-temperature environment of the fire scene; and the furnace 10 can also be heated at the same time, and smoke can be introduced into the furnace 10 from the smoke inlet 11, that is, simulating the high-temperature and high-smoke environment of the fire scene.

[0040] In some embodiments of the present application, the distance between the first injection port 13 and the second injection port 14 is 15 cm-30 cm.

[0041] In the embodiment of the present application, the distance between the first injection port 13 and the second injection port 14 is set to 15cm-30cm, which can avoid the distance between the first injection port 13 and the second injection port 14 being too short, causing the distance between the first wire tube 21 and the second wire tube 22 to be too close, thereby causing the first wire and the second wire in the first wire tube 21 and the second wire tube 22 to be accidentally touched before the driving member 40 is driven, that is, a short circuit occurs in an unset environment, affecting the experimental results; it can also avoid the distance between the first injection port 13 and the second injection port 14 being too long, resulting in the first wire and the second wire traveling too long towards each other, increasing the difficulty of preparation. Therefore, the embodiment provided in the embodiment of the present application can improve the preparation efficiency of preparing short-circuit melt marks without affecting the experimental results.

[0042] For example, the distance between the first injection port 13 and the second injection port 14 may be 15 cm, 20 cm or 30 cm.

[0043] In some embodiments of the present application, Figure 3 As shown, the injection assembly also includes an adjustment key (not shown), the driving member 40 includes a motor 41 and a driving rod 42, the driving rod 42 is connected to one of the first wire tube 21 and the second wire tube 22, and the adjustment key is used to adjust the advancement speed of the motor 41.

[0044] In the embodiment of the present application, when the first wire and the second wire touch at different speeds, the short-circuit melt marks generated are also different. In the process of preparing the melt marks, when the temperature and smoke volume in the simulated environment in the furnace 10 are different, the first wire and the second wire can be controlled to touch at the same speed, thereby ensuring that the touching speed in the experiment is quantitative, thereby ensuring the experimental effect. When the temperature and smoke volume in the simulated environment in the furnace 10 are the same, the motor 41 is controlled by the adjustment key to push any one of the first wire tube 21 and the second wire tube 22 at different propulsion speeds, so that the first wire and the second wire touch at different speeds, which can ensure that the temperature and smoke in the experiment are quantitative, and use the control variable method to ensure the preparation effect of different melt marks.

[0045] In some embodiments of the present application, the short-circuit melt mark preparation device further includes a controller (not shown), such as Figure 2 As shown, the heating assembly 50 includes a heater 51 and a temperature detector (not shown), the controller is electrically connected to the heater 51 and the temperature detector, the heater 51 is arranged on the side wall of the furnace body 1, and the temperature detector is arranged on the inner wall of the top of the furnace body 1. When the temperature detector detects that the temperature reaches a preset temperature, the controller controls the heater 51 to stop heating and enter a heat preservation state.

[0046] In the embodiment of the present application, the heater 51 is arranged on the side wall of the furnace body 1, so that the heater 51 can heat from all sides of the furnace 10, and the heat diffuses from all sides of the furnace 10 to the center of the furnace 10, thereby making the temperature rise in the furnace 10 relatively more uniform. Since the movement direction of the hot air heated in the furnace 10 is upward, the temperature detector is arranged on the inner wall at the top of the furnace body 1, so that the temperature detection process is more accurate. In addition, the controller controls the working state of the heater 51 according to the temperature value detected by the temperature detector, which can make the short-circuit melt mark preparation device more intelligent, thereby saving labor costs.

[0047] Specifically, the heater 51 may be a heating rod, which is placed in the side wall of the furnace body 1. The outside of the heating rod is wrapped with a high-strength heat-conducting material, which can fully conduct the heat of the heating rod to the furnace 10. In addition, a thyristor module is provided in the heater 51, and the thyristor can control the heater 51 to rise to a preset temperature. The temperature detector may be a thermocouple. Compared with other temperature detectors, the thermocouple has higher measurement accuracy, a wider range of measurable temperatures, and a simple structure. Therefore, under the premise of more accurately controlling the temperature in the furnace 10, the production cost of the short-circuit melt mark preparation device can also be saved.

[0048] More specifically, the power range of the heater 51 is 10-30 kW, and the current range is 50-60A.

[0049] The size of the furnace 10 can be adjusted according to actual needs. For example, the size of the furnace 10 in the embodiment of the present application is 50cm*35cm*35cm.

[0050] In some embodiments of the present application, Figure 1 As shown, the short-circuit melt mark preparation device also includes a smoke detection component 60, which is arranged on the inner wall of the furnace body 1, and the smoke inlet port 11 is connected to a smoke inlet pipe 110, and the smoke inlet pipe 110 is provided with an air intake valve 111. The smoke detection component 60 and the air intake valve 111 are electrically connected to the controller. When the smoke detection component 60 detects that the smoke density in the furnace 10 reaches a preset value, the controller controls the air intake valve 111 to close.

[0051] In the embodiment of the present application, the smoke detection component 60 can detect the smoke density in the furnace 10, and thus can obtain the smoke volume in the furnace 10. The air intake valve 111 can control the on-off of the air intake of the smoke intake pipe 110, so it is possible to control the smoke volume in the furnace 10 by controlling the working state of the air intake valve 111. In addition, the controller is electrically connected to the smoke detection component 60 and the air intake valve 111, respectively, and the controller can directly control the working state of the air intake valve 111 through the numerical value detected by the smoke detection component 60, so that the short-circuit melt mark preparation device is more intelligent, thereby saving labor costs.

[0052] In some embodiments of the present application, Figure 1 As shown, the smoke detection assembly 60 includes a light emitter 61 and a light receiver 62 , and the light emitter 61 and the light receiver 62 are arranged on the inner walls of the furnace body 1 at opposite positions.

[0053] In the embodiment of the present application, the smoke detection component 60 is a photoelectric detector. The light emitted by the light emitter 61 is scattered by the smoke in the furnace 10 and then collected by the light receiver 62. By comparing and analyzing the light emission amount of the light emitter 61 and the light reception amount of the light receiver 62, the smoke density in the furnace 10 can be better detected. The light emitter 61 and the light receiver 62 are arranged on the inner wall of the furnace body 1 at opposite positions, which will not affect the smoke environment in the furnace 10. In addition, the light emitter 61 and the light receiver 62 are located at opposite positions, so that the light emitted by the light emitter 61 can completely pass through the furnace 10 to reach the light receiver 62, thereby fully detecting the smoke in the furnace 10 and improving the accuracy of smoke detection.

[0054] The smoke detection component 60 may also include an optical power supply system and a data acquisition and processing system. The optical power supply system is used to provide power to the optical transmitter 61 and the optical receiver 62. The data acquisition and processing system performs real-time analysis on the light data emitted by the optical transmitter 61 and the light data received by the optical receiver 62, further improving the intelligence of the short-circuit melt mark preparation device. The power supply device in the optical power supply system is a programmable DC voltage regulator with a rated voltage of 30V and a rated current of 5A.

[0055] Specifically, the light emitter 61 and the light receiver 62 can be connected to the furnace body 1 through a flange. More specifically, the light emitter 61 includes a light source, a convex lens and an achromatic lens. The light source is used to emit light, the convex lens can converge the divergent light source, and the achromatic lens is used to correct the chromatic aberration of the emitted light. The light receiver 62 includes a silicon photocell, a bandpass filter, a correction filter, etc. The silicon photocell can directly convert light energy into electrical energy, so that the signal received by the light receiver 62 can be transmitted to the data acquisition and processing system in real time for processing.

[0056] In some embodiments of the present application, the short-circuit melting mark preparation device further includes a fan (not shown) arranged on the smoke inlet duct 110 .

[0057] In the embodiment of the present application, by adjusting the frequency of the fan, the speed of smoke entering the smoke inlet 11 through the smoke inlet duct 110 can be controlled, thereby controlling the amount of smoke per unit time.

[0058] It should be noted that a fan may also be provided on the smoke outlet duct 120 to lead the smoke in the furnace 10 out through the fan, and the smoke outlet speed may also be controlled by controlling the frequency of the fan. The air inlet valve 111 cooperates with the fan to keep the smoke in the furnace 10 in a relatively stable state during the experiment.

[0059] In some embodiments of the present application, the smoke outlet 12 is arranged at the top of the furnace body 1 , the smoke outlet 12 is connected to a smoke outlet pipe, an exhaust valve is provided on the smoke outlet pipe, and the smoke inlet 11 is located below the first sample inlet 13 and the second sample inlet 14 .

[0060] In the embodiment of the present application, since the movement direction of the smoke is upward, the smoke inlet 11 is arranged below the first sample inlet 13 and the second sample inlet 14, and the smoke outlet 12 is arranged at the top of the furnace body 1. When the smoke enters the furnace 10 from the smoke inlet 11, it can rise and pass through the position in the furnace 10 that is horizontal with the first sample inlet 13 and the second sample inlet 14, so that the smoke can pass through the position where the first wire and the second wire touch as much as possible, making the smoke simulation environment more realistic.

[0061] Specifically, Figure 2 As shown, the smoke inlet 11 can be arranged on the collecting pipe 30, and the collecting pipe 30 is connected to the furnace 10, so the smoke rising to the furnace 10 through the collecting pipe 30 can be fully diffused into the furnace 10, thereby improving the accuracy of melt mark preparation.

[0062] In some embodiments of the present application, Figure 1 and Figure 2 As shown, the collecting pipe 30 includes a first part 31 and a second part 32 connected to each other. The first part 31 is connected to the furnace 10 and is funnel-shaped. The axial direction of the first part 31 is consistent with the height direction of the furnace body 1. The cross-sectional area of ​​the first part 31 decreases gradually in the direction away from the furnace 10, and the cross-sectional area of ​​the second part 32 is equal to the cross-sectional area of ​​the first part 31 at the connection.

[0063] In the present application embodiment, Figure 1 and Figure 2 As shown, the first part 31 is funnel-shaped, and the cross-sectional area of ​​the first part 31 decreases gradually in the direction away from the furnace 10, which can guide and collect the short-circuit melt marks falling from the furnace 10. The fallen melt marks can slide down along the side wall of the first part 31 to prevent the melt marks from falling vertically and causing damage to the melt marks. It can protect the melt marks and ensure the integrity of the melt marks, thereby improving the accuracy of the melt mark detection experiment.

[0064] In some embodiments of the present application, the second portion 32 is bent relative to the first portion 31 so that the end of the second portion 32 is perpendicular to the axial direction of the first portion 31 , and a movable baffle 320 is provided at the outlet of the collection pipe 30 .

[0065] In the embodiment of the present application, the height direction of the furnace body 1 is generally vertical, the end of the second part 32 is perpendicular to the axial direction of the first part 31, the axial direction of the first part 31 is consistent with the height direction of the furnace body 1, so the axis of the first part 31 is also vertical, and the end of the second part 32 is horizontal. The bent second part 32 can guide and buffer the falling melt mark. When the melt mark slides to the end of the second part 32, the baffle 320 can block the melt mark, so that the falling melt mark can accumulate at the baffle 320. After the melt mark is prepared, the baffle 320 is removed and the melt mark is taken out.

[0066] In some embodiments of the present application, a viewing window 70 is further provided on the furnace body 1 , and a side wall where the viewing window 70 is located is opposite to a side wall where the first injection port 13 and the second injection port 14 are located.

[0067] In the embodiment of the present application, the melt mark preparation process in the furnace 10 can be observed through the window 70, and the position of the window 70 is opposite to the first injection port 13 and the second injection port 14. This setting enables the user to more intuitively observe the short circuit process of the first wire and the second wire.

[0068] Specifically, handles 71 may be provided on both sides of the window 70 , and the window 70 can be opened by the handles 71 .

[0069] The second aspect of the present application provides a method for preparing a short-circuit melt mark, such as Figures 1 to 3 As shown, the method for preparing the short-circuit melt mark includes:

[0070] S1: The controller controls the heater 51 to heat. After the temperature detector detects that the furnace 10 reaches a preset temperature, the controller controls the heater 51 to stop heating and enter a heat preservation state.

[0071] S2: Open the air inlet valve 111 on the smoke inlet pipe 110, and the smoke enters the furnace 10 through the smoke inlet port 11. When the smoke detection component 60 detects that the smoke density in the furnace 10 reaches a preset density, the air inlet valve 111 is closed.

[0072] S3: Extend the first wire and the second wire from the first wire tube 21 and the second wire tube 22 into the furnace 10 and place them for a preset time.

[0073] S4: After the preset time is reached, the driving member 40 drives at least one of the first wire tube 21 and the second wire tube 22 to move, and the first wire tube 21 and the second wire tube 22 are energized, and the first wire tube 21 and the second wire tube 22 drive the first wire and the second wire to approach each other until the first wire and the second wire touch and short-circuit.

[0074] S5: The melting mark after the short circuit between the first conductive wire and the second conductive wire falls into the collecting pipe 30 .

[0075] In the embodiment of the present application, through the preparation method of the short-circuit melt mark, the furnace 10 can be made to reach a preset temperature through the heater 51, and smoke can be introduced into the furnace 10 through the smoke inlet 11 to simulate the environment of the fire scene. When the environment in the furnace 10 is stable, the driving member 40 drives the first wire and the second wire to move toward each other, and can touch each other at a preset angle a to short-circuit, and the short-circuit melt marks of the first wire and the second wire fall into the collection pipe 30. Repeating the above steps with different contact angles a of the first wire and the second wire can obtain a variety of different wire short-circuit melt marks, thereby improving the diversity of wire melt mark preparation. Since the first wire and the second wire can be continuously extended from the outside through the first wire tube 21 and the second wire tube 22, the short-circuit melt marks under the same environment can be continuously prepared, thereby improving the consistency and reproducibility of the short-circuit melt marks of the same batch. The first wire tube 21 and the second wire tube 22 are rigid tubes. On the one hand, the flexibility of the wire is relatively large, so the first wire tube 21 and the second wire tube 22 can play a good supporting role for the first wire and the second wire, and it is convenient to control the position repeatability of the first wire and the second wire each time they contact the short circuit, so as to obtain a short-circuit melt mark sample with good repeatability. On the other hand, the first wire tube 21 and the second wire tube 22 can protect the first wire and the second wire, and prevent the first wire and the second wire from directly contacting the side wall of the furnace body 1, resulting in wear of the first wire and the second wire. The first wire tube 21 and the second wire tube 22 can also control the distance that the first wire and the second wire extend each time, so as to control the length of the melt mark sample after the first wire and the second wire touch the short circuit to be more uniform, further improve the repeatability of the short-circuit melt mark sample, and by reasonably designing the length of the short-circuit melt mark sample, it can also achieve the effect of saving the use of the first wire and the second wire.

[0076] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0077] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A short-circuit melting mark preparation device, characterized in that: include: A furnace body (1), the furnace body (1) having a hollow furnace chamber (10), the furnace body (1) having a smoke inlet (11) and a smoke outlet (12), and a first sample inlet (13) and a second sample inlet (14) being arranged on a side wall of the furnace body (1); A heating component (50), the heating component (50) being arranged on the furnace body (1) and used for heating the furnace chamber (10) to a preset temperature; An injection assembly, the injection assembly comprising a first wire tube (21) and a second wire tube (22) and a driving member (40) which are inserted into the first injection port (13) and the second injection port (14), the first wire tube (21) and the second wire tube (22) being rigid tubes, the driving member (40) being used to drive at least one of the first wire tube (21) and the second wire tube (22) to move so that the first wire tube (21) and the second wire tube (22) are moved closer to or farther from each other; a first wire and a second wire, wherein the first wire is passed through the first wire tube (21), and the second wire is passed through the second wire tube (22), and when the first wire tube (21) and the second wire tube (22) are close to each other, the first wire and the second wire touch each other to form a short circuit; A collecting pipe (30), one end of which is in communication with the furnace (10), and a melting mark after the first wire and the second wire are short-circuited falls into the collecting pipe (30).

2. The short-circuit melting mark preparation device according to claim 1, characterized in that: The distance between the first injection port (13) and the second injection port (14) is 15 cm-30 cm.

3. The short-circuit melting mark preparation device according to claim 1, characterized in that: The injection assembly also includes an adjustment key, the driving member (40) includes a motor (41) and a driving rod (42), the driving rod (42) is connected to one of the first wire tube (21) and the second wire tube (22), and the adjustment key is used to adjust the advancement speed of the motor (41).

4. The short-circuit melting mark preparation device according to claim 1, characterized in that: The short-circuit melt mark preparation device also includes a controller, the heating component (50) includes a heater (51) and a temperature detector, the controller is electrically connected to the heater (51) and the temperature detector, the heater (51) is arranged on the side wall of the furnace body (1), and the temperature detector is arranged on the inner wall of the top of the furnace body (1), and when the temperature detector detects that the temperature reaches a preset temperature, the controller controls the heater (51) to stop heating and enter a heat preservation state.

5. The short-circuit melting mark preparation device according to claim 4, characterized in that: The short-circuit melt mark preparation device further comprises a smoke detection component (60), the smoke detection component (60) being arranged on the inner wall of the furnace body (1), the smoke inlet (11) being connected to a smoke inlet pipe (110), the smoke inlet pipe (110) being provided with an air inlet valve (111), the smoke detection component (60) and the air inlet valve (111) being electrically connected to the controller, and when the smoke detection component (60) detects that the smoke density in the furnace (10) reaches a preset value, the controller controls the air inlet valve (111) to close.

6. The short-circuit melting mark preparation device according to claim 5, characterized in that: The smoke detection component (60) comprises a light emitter (61) and a light receiver (62), wherein the light emitter (61) and the light receiver (62) are arranged on inner walls of the furnace body (1) at opposite positions.

7. The short-circuit melting mark preparation device according to claim 5, characterized in that: The short-circuit melting mark preparation device also includes a fan arranged on the smoke inlet duct (110).

8. The short-circuit melting mark preparation device according to any one of claims 1 to 7, characterized in that: The smoke outlet (12) is arranged at the top of the furnace body (1), the smoke outlet (12) is connected to a smoke outlet pipe (120), an exhaust valve is arranged on the smoke outlet pipe (120), and the smoke inlet (11) is located below the first sample inlet (13) and the second sample inlet (14).

9. The short-circuit melting mark preparation device according to any one of claims 1 to 7, characterized in that: The collecting pipe (30) comprises a first part (31) and a second part (32) which are connected to each other; the first part (31) is connected to the furnace (10) and is funnel-shaped; the axial direction of the first part (31) is consistent with the height direction of the furnace body (1); the cross-sectional area of ​​the first part (31) decreases in a direction away from the furnace (10); and the cross-sectional area of ​​the second part (32) is equal to the cross-sectional area of ​​the first part (31) at the connection point.

10. The short-circuit melting mark preparation device according to claim 9, characterized in that: The second part (32) is bent relative to the first part (31) so that the end of the second part (32) is perpendicular to the axial direction of the first part (31), and a movable baffle (320) is provided at the outlet of the collecting pipe (30).

11. The short-circuit melting mark preparation device according to any one of claims 1 to 7, characterized in that: The furnace body (1) is also provided with a viewing window (70), and the side wall where the viewing window (70) is located is opposite to the side wall of the furnace body (1) where the first injection port (13) and the second injection port (14) are located.

12. A method for preparing a short-circuit melt mark, characterized in that: include: The controller controls the heater (51) to heat, and after the temperature detector detects that the furnace (10) has reached a preset temperature, the controller controls the heater (51) to stop heating and enter a heat preservation state; Opening the air intake valve (111) on the smoke intake pipe (110), allowing smoke to enter the furnace (10) through the smoke intake port (11), and closing the air intake valve (111) when the smoke detection component (60) detects that the smoke density in the furnace (10) reaches a preset density; Extending the first conductive wire and the second conductive wire from the first conductive tube (21) and the second conductive tube (22) into the furnace (10) and leaving them there for a preset time; After a preset time is reached, the driving member (40) drives at least one of the first wire tube (21) and the second wire tube (22) to move, and the first wire tube (21) and the second wire tube (22) are energized, so that the first wire tube (21) and the second wire tube (22) drive the first wire and the second wire to approach each other until the first wire and the second wire touch and short-circuit; The molten trace after the first conductive wire and the second conductive wire are short-circuited falls into a collecting pipe (30).

Images