Fire trace preparation experimental device

Abstract

The invention discloses a fire trace preparation experiment device, and relates to the field of fire investigation and trace preparation, the fire trace preparation experiment device comprises a power regulation control cabinet and a trace preparation chamber, the power regulation control cabinet comprises an electric voltage regulator, a rectifier, a direct current connector and an alternating current connector, the electric voltage regulator is connected between the alternating current power supply and the alternating current connector, the rectifier is connected between the alternating current power supply and the direct current connector, the direct current connector is used for outputting direct current for the trace preparation chamber, the alternating current connector is used for outputting alternating current for the trace preparation chamber, and the electric voltage regulator is used for regulating voltage and current of the output alternating current. The rectifier is used for adjusting the current of the output direct current, the trace preparation chamber is used for simulating electrical circuit fault traces and preparing other types of fire traces according to the direct current or the alternating current, and the electrical circuit fault traces comprise electrical circuit fault traces generated by primary short circuit, secondary short circuit or overcurrent faults. The experiment cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of fire investigation and trace preparation, and in particular to a fire trace preparation experimental device. Background Art

[0002] For fires that occur, it is necessary to find out the cause of the fire in order to prescribe the right medicine and carry out effective fire prevention and control work. Due to the serious destructiveness of fires and the extreme complexity of the causes of fires, the fire traces produced by the changes such as pyrolysis, evaporation, melting, fracture, and dripping of materials at the fire scene after being subjected to high temperature and collision are the key evidence for investigating and identifying the cause of the fire. Every fire investigator should be proficient in the formation process and typical characteristics of typical fire traces. Due to the serious damage at the fire scene, the complex and diverse heat generation and heat transfer mechanisms, and the high-temperature changes of various materials involved, in the education and training of professional and technical personnel in fire investigation, it is difficult to contact the actual fire scene, and it is impossible to learn about typical fire traces through intuitive observation. Therefore, it is necessary to study a comprehensive set of fire trace preparation devices to realize the laboratory preparation of typical traces at the fire scene, conduct in-depth research on the formation mechanism and typical characteristics of common fire traces, and provide equipment support for the training, teaching and scientific research of fire investigators. Summary of the invention

[0003] The purpose of the present application is to provide a fire trace preparation experimental device, which can generate electrical line fault traces under various electrical faults and other types of fire traces, thereby reducing the experimental cost.

[0004] To achieve the above objectives, this application provides the following solutions: The present application provides a fire trace preparation experimental device, which includes: a power control cabinet and a trace preparation room, the power control cabinet includes an electric voltage regulator, a rectifier, a DC connector and an AC connector, the electric voltage regulator is connected between the AC power supply and the AC connector, the rectifier is connected between the AC power supply and the DC connector, the DC connector is used to output DC power to the trace preparation room, the AC connector is used to output AC power to the trace preparation room, the electric voltage regulator is used to adjust the voltage and current of the output AC power, the rectifier is used to adjust the current of the output DC power, the trace preparation room is used to simulate electrical circuit fault traces according to the DC power or the AC power and prepare other types of fire traces; the electrical circuit fault traces include electrical circuit fault traces generated by primary short circuit, secondary short circuit or overcurrent fault, and other types of fire traces include wood burning traces, liquid burning traces, glass damage traces, arc burning traces and metal deformation and discoloration traces.

[0005] Optionally, the power regulation control cabinet also includes a control panel and a current booster, the current booster is connected between the electric voltage regulator and the AC connector, and the control panel is provided with a current boost start button, a current boost stop button, a current boost power-on indicator light and an emergency stop button connected to the current booster.

[0006] Optionally, the control panel is also provided with a rectifier switch connected to the rectifier, a rectifier start button and a rectifier stop button.

[0007] Optionally, the control panel is also provided with a main switch, an input voltmeter, a first output voltmeter and a second output voltmeter, the main switch is used to control the on and off of the AC power supply, the input voltmeter is used to display the voltage of the AC power supply, the first output voltmeter is used to display the voltage value of the DC voltage output by the DC connector, and the second output voltmeter is used to display the voltage value of the AC voltage output by the AC connector.

[0008] Optionally, the trace preparation room includes a DC welder and an AC welder, the DC welder being used to simulate a primary short circuit, a secondary short circuit or an overcurrent fault of the DC power based on the DC power output by the DC connector; The AC welding machine is used to simulate a primary short circuit, a secondary short circuit or an overcurrent fault of the AC power based on the AC power output by the AC connector.

[0009] Optionally, the control panel is further provided with an inching boost button, an inching boost indicator light, an inching voltage reduction button, an inching voltage reduction indicator light and a voltage regulating switch connected to the electric voltage regulator, the inching boost button is used to control the increase of the voltage output by the electric voltage regulator, the inching voltage reduction button is used to control the decrease of the voltage output by the electric voltage regulator, and the voltage regulating switch is used to disconnect the circuit when the voltage output by the electric voltage regulator exceeds a set voltage range; Alternatively, the control panel is also provided with a momentary current increase button, a momentary current increase start indicator light, a momentary current decrease button, a momentary current decrease start indicator light and a current adjustment switch connected to the electric voltage regulator, the momentary current increase button is used to control the increase of the current output by the electric voltage regulator, the momentary current decrease button is used to control the decrease of the current output by the electric voltage regulator, and the current adjustment switch is used to disconnect the line when the current output by the electric voltage regulator exceeds a set current range.

[0010] Optionally, the trace preparation chamber includes a glass damage trace simulation device, which includes a glass fixing device, a pendulum and a heating source; the glass fixing device is used to fix the glass, and the pendulum is used to break the glass through the impact force of the swing to simulate the traces caused by mechanical damage to the glass; the heating source is used to heat the fixed glass, and the glass explosion process at different temperatures and different heating rates is simulated by adjusting the power of the heating source.

[0011] Optionally, the trace preparation chamber includes a combustion simulation experimental device, which includes a glass sealed space and a ventilation device, wherein the ventilation device is used for ventilating the glass sealed space, and the glass sealed space includes an air switch and a heating stove, wherein the air switch is used to control the start and stop of the heating stove, and the heating stove is used to heat or ignite the target object to generate burn marks on the target object.

[0012] Optionally, the target object includes a wood object, a metal object or a liquid object.

[0013] Optionally, the rated power of the electric voltage regulator is 80KW, and the voltage regulation range is 0V to 450V.

[0014] According to the specific embodiments provided in the present application, the present application discloses the following technical effects: the present application provides a fire trace preparation experimental device, which simulates primary short circuit, secondary short circuit, and overcurrent fault according to direct current or alternating current, and can quantitatively adjust the size of direct current or alternating current to generate electrical line fault traces under various voltage or current conditions. The trace preparation room is also used to prepare fire traces, which realizes the simulation of various fire traces through a set of devices and reduces the experimental cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic structural diagram of a fire trace preparation experimental device provided in one embodiment of the present application.

[0017] Figure 2 A schematic diagram of the structure of a power control cabinet provided in one embodiment of the present application.

[0018] Figure 3 A schematic diagram of the structure of a trace preparation chamber provided in one embodiment of the present application.

[0019] Figure 4 A schematic diagram of the structure of a trace preparation chamber provided in one embodiment of the present application.

[0020] Figure 5 A schematic diagram of the structure of a device for preparing glass damage traces provided in one embodiment of the present application.

[0021] Figure 6 A schematic diagram of the structure of a combustion simulation experimental device provided in one embodiment of the present application.

[0022] Figure 7 A schematic diagram of the structure of an arc burning mark preparation device provided in one embodiment of the present application.

[0023] Figure 8 A schematic diagram of a circuit structure provided in one embodiment of the present application.

[0024] Figure numerals: 1-power control cabinet; 2-trace preparation room; 3-input voltmeter; 4-display; 5-inching boost button; 6-boost indicator light; 7-current stop button; 8-current start button; 9-current power-on indicator light; 10-rectifier power-on indicator light; 11-rectifier start button; 12-rectifier stop button; 13-inching step-down indicator light; 14-inching step-down button; 15-rectifier adjustment knob; 16-load adjustment knob; 17-first AC socket; 18-second AC socket; 19-rectifier switch; 20-voltage regulator switch; 21-computer switch; 22-socket overload power-on indicator light; 23-socket overload start button; 24-socket overload stop button; 25-emergency stop button; 26-keyboard box; 27-industrial computer; 28-burning socket switch; 29-bulb socket; 30-burning bulb switch; 31-fan switch; 32-main switch; 33- DC welding machine; 34-AC welding machine; 35-transformer; 36-first interface; 37-second interface; 38-third interface; 39-fourth interface; 40-fifth interface; 41-sixth interface; 42-electric voltage regulator; 43-blower; 44-connector position; 45-glass fixing device; 46-pendulum; 47-air switch; 48-heating stove; 49-welding gun; 50-AC power supply; 51-sensor power supply; 52-rectifier; 53-first voltage regulating component; 54-second voltage regulating component; 55-voltage regulating motor; 56-first AC voltage sensor; 57-DC voltage sensor; 58-DC current sensor; 59-second AC voltage sensor; 60-first AC current sensor; 61-bulb; 62-second AC current sensor; 63-third AC voltage sensor; 64-data acquisition unit; 65-output terminal; 66-current booster. DETAILED DESCRIPTION

[0025] 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 without creative work are within the scope of protection of this application.

[0026] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0027] This application provides a fire trace preparation experimental device, such as Figure 1 As shown, the fire trace preparation experimental device includes: a power control cabinet 1 and a trace preparation room 2. The power control cabinet 1 includes an electric voltage regulator 42, a rectifier, a DC connector and an AC connector. The electric voltage regulator 42 is connected between the AC power supply 50 and the AC connector. The rectifier is connected between the AC power supply 50 and the DC connector. The DC connector is used to output DC power to the trace preparation room 2. The AC connector is used to output AC power to the trace preparation room 2. The electric voltage regulator 42 is used to adjust the voltage and current of the output AC power. The rectifier is used to adjust the current of the output DC power. The trace preparation room 2 is used to simulate electrical circuit fault traces according to the DC power or the AC power and prepare other types of fire traces. The electrical circuit fault traces include electrical circuit fault traces generated by primary short circuit, secondary short circuit, overcurrent fault or poor contact. Other types of fire traces include wood burning traces, liquid burning traces, glass damage traces, arc burning traces and metal deformation and discoloration traces. Secondary short circuit refers to the situation where the electrical circuit is short-circuited when it is burning.

[0028] The power control cabinet 1 is also used to provide power for the preparation of other types of fire traces.

[0029] The AC power supply 50 of the present application can output different types of voltages, DC and AC, after rectification and voltage regulation. It can simulate primary short circuit, secondary short circuit and overcurrent fault according to DC or AC, and can quantitatively adjust the size of DC or AC to generate electrical line fault traces under various voltage or current conditions. The trace preparation room 2 is also used to prepare other types of fire traces, thereby realizing the simulation of various fire traces through a set of equipment and reducing experimental costs.

[0030] Related electrical fault experiments are mainly qualitative experiments, lacking control variables, and have a large degree of randomness in the experiments, which has a large impact on the deviation of the experimental results. The device of the present application can achieve quantitative control of current, voltage and the way in which the fault occurs, and can quantitatively control the experimental variables, making the experimental results true and reliable.

[0031] like Figure 3 As shown, a fan 43 and a connector position 44 are provided at the top of the trace preparation chamber 2, and a DC connector and an AC connector are provided at the connector position 44. Figure 4 As shown, the DC connector includes a first interface 36 and a second interface 37 , the first interface 36 is a DC positive electrode, the first interface 36 is a DC negative electrode, and the first interface 36 and the second interface 37 are used to output the DC power of the power control cabinet 1 .

[0032] The AC connector includes a third interface 38, a fourth interface 39, a fifth interface 40 and a sixth interface 41, and the third interface 38, the fourth interface 39, the fifth interface 40 and the sixth interface 41 are interfaces for three-phase electricity and a neutral line respectively, and the third interface 38, the fourth interface 39, the fifth interface 40 and the sixth interface 41 are used to output the AC power of the power control cabinet 1.

[0033] The rated power of the electric voltage regulator 42 is 80KW, and the voltage regulation range is 0V to 450V. The electric voltage regulator 42 realizes stepless voltage regulation by sliding three-phase voltage regulating blades, and the blade control motor is controlled by the program circuit, and the sliding blade is driven to slide by the rotating chain, and the voltage is output to the power control cabinet 1.

[0034] The power control cabinet 1 also includes a control panel and a current booster, the current booster is connected between the electric voltage regulator 42 and the AC connector, the control panel is provided with a current boost start button 8, a current boost stop button 7, a current boost power-on indicator light 9 and an emergency stop button 25 connected to the current booster, the current booster is used to increase the current by controlling the electric voltage regulator 42, specifically, the current boost is started and stopped by the current boost start button 8 and the current boost stop button 7. Among them, the emergency stop button 25 is used for emergency power off.

[0035] like Figure 2 As shown, the control panel is also provided with a rectifier switch 19 connected to the rectifier, a rectifier start button 11, a rectifier stop button 12 and a rectifier adjustment knob 15.

[0036] The control panel is also provided with a main switch 32, an input voltmeter 3, a first output voltmeter, a second output voltmeter and a display 4. The main switch 32 is used to control the on and off of the AC power supply 50, the input voltmeter 3 is used to display the voltage of the AC power supply 50, the first output voltmeter is used to display the voltage value of the DC voltage output by the DC connector, and the second output voltmeter is used to display the voltage value of the AC voltage output by the AC connector.

[0037] The trace preparation room 2 is the place where the trace preparation experiment takes place. The trace preparation room 2 includes a DC welding machine 33 and an AC welding machine 34. The DC welding machine 33 is used to simulate a primary short circuit, a secondary short circuit or an overcurrent fault of a DC power based on the DC power output by the DC connector. The DC welding machine 33 is a 315 type DC welding machine 33.

[0038] The trace preparation room 2 also includes a lighting device for improving bright observation conditions.

[0039] The AC power source 50 is 380V AC mains electricity.

[0040] The AC welding machine 34 is used to simulate a primary short circuit, a secondary short circuit or an overcurrent fault of the AC power based on the AC power output by the AC connector.

[0041] DC electrical fault control method: The rectifier is controlled by the rectifier switch 19, the rectifier start button 11, the rectifier stop button 12, and the rectifier adjustment knob 15, and is connected to the rectifier power-on indicator light 10 to display the rectifier power-on status. The rectifier switch 19 is connected to 380V AC mains power, which is converted into DC power by the rectifier and then output. The rectifier is controlled in parallel by the built-in CNC starter (computer program control), the rectifier start button 11, the rectifier stop button 12, and the rectifier adjustment knob 15. This application can preset the current size through the computer background, and can also adjust the DC current size through the rectifier adjustment knob 15. The parallel control process means that the rectifier start and rectifier stop buttons 12 can control the output of the current. After the preset current is set in the computer background, after the rectifier starts, the current value can quickly reach the preset current value, and the rectifier stop button 12 can instantly cut off the current. The DC power output by the power control cabinet 1 is output to the DC welding machine 33 through the first interface 36 and the second interface 37 on the DC connector in the trace preparation room 2, and the DC welding machine 33 outputs stable DC power through the wiring terminals. The wiring terminals are connected to the welding gun 49, and output stable welding current for generating an arc. The DC welding machine 33 refers to a welding head connected by a cable, which, as a carrier, outputs corresponding current and voltage states. When testing a DC electrical fault, the welding machine is connected to the corresponding interface of the connector to output DC power. The two ends of the welding machine are connected to the wires, and it can be used to prepare a DC electrical fault trace.

[0042] The control panel is also provided with a momentary boost button 5, a boost indicator light 6, a momentary voltage reduction button 14, a momentary voltage reduction indicator light 13 and a voltage regulating switch 20 connected to the electric voltage regulator 42. The momentary boost button 5 is used to control the increase of the voltage output by the electric voltage regulator 42, the momentary voltage reduction button 14 is used to control the decrease of the voltage output by the electric voltage regulator 42, and the voltage regulating switch 20 is used to disconnect the circuit when the voltage output by the electric voltage regulator 42 exceeds the set voltage range. Alternatively, the control panel is also provided with a momentary current increase button, a momentary current increase indicator light, a momentary current decrease button, a momentary current decrease start indicator light and a current adjustment switch connected to the electric voltage regulator 42; the momentary current increase button, the momentary current increase indicator light, the momentary current decrease button, the momentary current decrease indicator light and the current adjustment switch adjust the output AC power after the current increase button is pressed, the momentary current increase button is used to control the increase of the current output by the electric voltage regulator 42, the momentary current decrease button is used to control the decrease of the current output by the electric voltage regulator 42, and the current adjustment switch is used to disconnect the line when the current output by the electric voltage regulator 42 exceeds the set current range.

[0043] AC electrical fault control mode: The three-phase voltage output by the 380V AC mains is input to the electric voltage regulator 42 of the power control cabinet 1 through the main switch 32. The electric voltage regulator 42 is provided with a jog boost / current button, a boost / current indicator light, a jog buck / current button, a buck / current indicator light and a voltage / current switch. The jog boost / current button and the jog buck / current button are manually controlled, and the built-in program controls the boost starter and the buck starter, and the boost / current indicator light of the voltage regulating cabinet and the buck / current start indicator light of the voltage regulating cabinet are connected to display the working status of the voltage regulator. The voltage regulating switch or the current regulating switch serves as an AC control protector, and can be powered off urgently when the voltage or current is abnormal and exceeds the threshold. The AC power output by the power control cabinet 1 is output through the third interface 38, the fourth interface 39, the fifth interface 40, and the sixth interface 41 on the AC connector in the trace preparation room 2, respectively, and the AC power is output through the wiring terminal of the AC welding machine 34. The boost starter is used to control the electric voltage regulator 42 to increase the output voltage, and the buck starter is used to control the electric voltage regulator 42 to reduce the output voltage.

[0044] AC experiments are usually accompanied by high voltage and are very dangerous. The AC control protector can instantly disconnect the AC input when the abnormal voltage exceeds the threshold.

[0045] The power control cabinet 1 is equipped with a computer switch 21 (a switch for control functions), a keyboard box 26 and an industrial computer 27. The industrial computer 27 is used to operate the experiment and collect and record data. The data is displayed on the display 4. The keyboard in the keyboard box 26 is used to operate the industrial computer 27. The experiment is equipped with a light bulb socket 29, which is used to connect an external light bulb 61 to observe whether the experiment is energized, and the socket switch 28 and the light bulb switch 30 control whether the light bulb socket 29 is energized. The fan switch 31 controls the fan to exhaust the smoke generated during the experiment. The power control cabinet 1 is equipped with a mains socket, which can be connected to an external experimental device. The socket overload power-on indicator 22 determines whether the socket is energized. The socket can be controlled to be overloaded by the socket overload start button 23 and the socket overload stop button 24. The mains socket includes a first mains socket 17 and a second mains socket 18.

[0046] The power control cabinet 1 further includes a transformer 35, which is used to adjust the voltage input from other external power sources (power sources other than the above-mentioned AC power source 50). The second voltage regulating component 54 is a voltage transformation component of the transformer 35. The control panel further includes a load adjustment knob 16, which is used to adjust the voltage at the output end of the second voltage regulating component 54 by adjusting the voltage of the load. The load is an adjustable resistor.

[0047] The trace preparation room 2 includes a glass damage trace simulation device for preparing fire scene glass damage traces, which include glass mechanical damage and thermal cracking traces. Figure 5 As shown, the glass damage trace simulation device includes a glass fixing device 45, a pendulum 46 and a heating source. The glass fixing device is used to fix the glass. The pendulum 46 is used to break the glass by the impact force of the swing to simulate the traces of mechanical damage to the glass. Specifically, by adjusting the mass and swing amplitude of the pendulum 46, the impact force, speed and other parameters can be adjusted. By adjusting the positional relationship between the glass fixing device and the pendulum 46, the impact angle and position can be adjusted to simulate the mechanical damage traces of the glass under different impact conditions. The heating source is used to heat the fixed glass. By adjusting the power of the heating source, the glass explosion process under different temperatures and different heating rates is simulated. The glass explosion process includes the glass explosion time and the difference in glass explosion traces.

[0048] The trace preparation room 2 includes a combustion simulation experiment device, which includes a glass sealed space and a ventilation device. The ventilation device is used to ventilate the glass sealed space, discharge harmful gases, and ensure the safe operation of the experiment. The glass sealed space includes an air switch 47 and a heating stove 48. The air switch 47 is used to control the start and stop of the heating stove 48. The heating stove 48 is used to heat or ignite the target object to generate burn marks on the target object. The ventilation device is provided with a separate power supply line and a control switch. The combustion simulation experiment device is used to carry out small-scale combustion simulation experiments and provide a combustion environment for secondary short circuits.

[0049] The target objects include wood objects, metal objects or liquid objects. The target objects or walls are arranged in the combustion simulation experimental device, and a smoke source is arranged simultaneously, so as to simulate the smoke action process and produce smoke marks.

[0050] A fire source may be arranged in the trace preparation room 2 to simulate the occurrence of a secondary short circuit fault, such as Figure 6 As shown; the welding gun 49 can be replaced to simulate electric welding operation and prepare electric welding operation traces, or prepare arc burning traces; fire sources, mechanical equipment and glass can be arranged to conduct glass damage trace experiments such as glass thermal cracking and mechanical damage; other items can be arranged to prepare item burning, metal deformation and discoloration or smoke traces.

[0051] In an exemplary embodiment, after connecting the experimental test circuit, the voltage, current and other parameters are adjusted by the electric voltage regulator 42 to simulate the DC short circuit, overvoltage, undervoltage, overcurrent and other processes (such as Figure 7 ), and prepare the corresponding fault traces, and also arrange a fire source (such as Figure 6 ) Directly bake and burn the wire to prepare secondary short circuit traces. By adjusting parameters such as voltage and current, it is possible to simulate AC short circuit, overvoltage, undervoltage, overcurrent and other processes, and prepare corresponding fault traces. It is also possible to arrange a fire source in the trace preparation chamber 2 to directly bake and burn the wire to prepare secondary short circuit traces.

[0052] The relevant circuit diagram of the fire trace preparation experimental device of this application is as follows Figure 8As shown, a DC voltage sensor 57 and a DC current sensor 58 are arranged on the output branch of the rectifier 52, a first AC voltage sensor 56 is arranged between the electric voltage regulator 42 and the current booster 66, a second AC voltage sensor 62 and a first AC current sensor 60 are arranged at the output end of the current booster, and the first voltage regulating component 53 and the voltage regulating motor 55 constitute the electric voltage regulator 42. The present application also includes a second voltage regulating component 54, which adjusts the voltage output by the AC power source 50, and a second AC current sensor 62 and a third AC voltage sensor 63 are arranged on the output branch of the second voltage regulating component 54, and then the output terminal 65 is connected, and each voltage sensor and current sensor are connected to the data collector 64, and the data collector 64 transmits the collected voltage and current data to the industrial computer 27.

[0053] The relevant circuit diagram of the fire trace preparation experimental device of the present application includes three parallel branches connected to the AC power supply 50, one branch is the rectifier branch, one branch is the electric voltage regulator branch, and the other is the transformer branch. The transformer 35 is realized by the second voltage regulating component 54. In addition, the AC power supply 50 also provides a sensor power supply 51, and the first AC power socket 17, the second AC power socket 18 and the fan 43 are also connected in parallel with the sensor power supply 51.

[0054] This application can simulate common electrical circuit fault traces such as primary short circuit, secondary short circuit, overcurrent, poor contact, etc. that are common at fire scenes, and can also prepare common fire traces such as wood burning traces, liquid burning traces, glass damage, arc burning, metal deformation and discoloration. This application can use different electrical circuits and spatial arrangements to simulate the process of electrical circuit failure under different working conditions, prepare corresponding fault traces, and realize the simulated preparation of other common fire traces. This application has scientifically integrated the preparation functions of various traces, and the same equipment can meet various simulation experiments and trace preparation at the same time, effectively saving experimental space and costs. This application can realize the simulated preparation of typical common fire traces in the process of scientific research and teaching in fire-related fields, and carry out experimental research on the traceability collection and formation mechanism of fire traces.

[0055] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A fire trace preparation experimental device, characterized in that: The fire trace preparation experimental device includes: a power control cabinet and a trace preparation room, the power control cabinet includes an electric voltage regulator, a rectifier, a DC connector and an AC connector, the electric voltage regulator is connected between the AC power supply and the AC connector, the rectifier is connected between the AC power supply and the DC connector, the DC connector is used to output DC power to the trace preparation room, the AC connector is used to output AC power to the trace preparation room, the electric voltage regulator is used to adjust the voltage and current of the output AC power, the rectifier is used to adjust the current of the output DC power, the trace preparation room is used to simulate electrical circuit fault traces according to the DC power or the AC power and prepare other types of fire traces; the electrical circuit fault traces include electrical circuit fault traces generated by primary short circuit, secondary short circuit or overcurrent fault, and other types of fire traces include wood burning traces, liquid burning traces, glass damage traces, arc burning traces and metal deformation and discoloration traces.

2. The fire trace preparation experimental device according to claim 1, characterized in that: The power regulation control cabinet also includes a control panel and a current booster, wherein the current booster is connected between the electric voltage regulator and the AC connector, and the control panel is provided with a current boost start button, a current boost stop button, a current boost power-on indicator light and an emergency stop button connected to the current booster.

3. The fire trace preparation experimental device according to claim 2, characterized in that: The control panel is also provided with a rectifier switch connected to the rectifier, a rectifier start button and a rectifier stop button.

4. The fire trace preparation experimental device according to claim 2, characterized in that: The control panel is also provided with a main switch, an input voltmeter, a first output voltmeter and a second output voltmeter. The main switch is used to control the turning on and off of the AC power supply. The input voltmeter is used to display the voltage of the AC power supply. The first output voltmeter is used to display the voltage value of the DC voltage output by the DC connector. The second output voltmeter is used to display the voltage value of the AC voltage output by the AC connector.

5. The fire trace preparation experimental device according to claim 1, characterized in that: The trace preparation room includes a DC welder and an AC welder, wherein the DC welder is used to simulate a primary short circuit, a secondary short circuit or an overcurrent fault of the DC power based on the DC power output by the DC connector; The AC welding machine is used to simulate a primary short circuit, a secondary short circuit or an overcurrent fault of the AC power based on the AC power output by the AC connector.

6. The fire trace preparation experimental device according to claim 2, characterized in that: The control panel is also provided with an inching boost button, an inching boost indicator light, an inching voltage reduction button, an inching voltage reduction indicator light and a voltage regulating switch connected to the electric voltage regulator, the inching boost button is used to control the increase of the voltage output by the electric voltage regulator, the inching voltage reduction button is used to control the decrease of the voltage output by the electric voltage regulator, and the voltage regulating switch is used to disconnect the circuit when the voltage output by the electric voltage regulator exceeds the set voltage range; Alternatively, the control panel is also provided with a momentary current increase button, a momentary current increase start indicator light, a momentary current decrease button, a momentary current decrease start indicator light and a current adjustment switch connected to the electric voltage regulator, the momentary current increase button is used to control the increase of the current output by the electric voltage regulator, the momentary current decrease button is used to control the decrease of the current output by the electric voltage regulator, and the current adjustment switch is used to disconnect the line when the current output by the electric voltage regulator exceeds a set current range.

7. The fire trace preparation experimental device according to claim 1, characterized in that: The trace preparation room includes a glass damage trace simulation device, which includes a glass fixing device, a pendulum and a heating source; the glass fixing device is used to fix the glass; the pendulum is used to break the glass through the impact force of the swing to simulate the traces caused by mechanical damage to the glass; the heating source is used to heat the fixed glass, and the glass explosion process at different temperatures and different heating rates is simulated by adjusting the power of the heating source.

8. The fire trace preparation experimental device according to claim 1, characterized in that: The trace preparation room includes a combustion simulation experimental device, which includes a glass sealed space and a ventilation device, wherein the ventilation device is used for ventilating the glass sealed space, and the glass sealed space includes an air switch and a heating stove, wherein the air switch is used for controlling the start and stop of the heating stove, and the heating stove is used for heating or igniting a target object to generate burn marks on the target object.

9. The fire trace preparation experimental device according to claim 8, characterized in that: The target object includes a wood object, a metal object or a liquid object.

10. The fire trace preparation experimental device according to claim 1, characterized in that: The rated power of the electric voltage regulator is 80KW, and the voltage regulation range is 0V to 450V.

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