A small-scale ship engine room fire experiment platform for different ventilation conditions and an experiment method thereof

Abstract

The present application relates to the technical field of fire safety, in particular to a small-scale ship engine room fire experiment platform and experiment method for different ventilation conditions; a ship cabin well is arranged in the middle of the top plate of the ship cabin, the ship cabin well and the ship cabin are through, and the upper end of the ship cabin well is a hinged end cover; a pair of air inlets are arranged in the front of the top plate, and a pair of air outlets are arranged in the rear of the top plate; the mechanical ventilation system comprises a blower and an exhaust fan, the blower is communicated with the pair of air inlets through a blower pipe, and the exhaust fan is communicated with the pair of air outlets through an exhaust pipe; when the blower and the exhaust fan are opened, the mechanical ventilation system is opened; when the blower and the exhaust fan are closed, the mechanical ventilation system is closed; when the upper end cover of the ship cabin well is opened, the natural ventilation is opened; when the upper end cover of the ship cabin well is closed, the natural ventilation is closed; therefore, the present application can study the fire behavior, smoke flow and smoke control mechanism in the small-scale engine room fire under different ventilation conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fire safety, in particular to a small-scale ship engine room fire experiment platform for different ventilation conditions and an experiment method thereof. BACKGROUND

[0002] In ship fire cases, the engine room is the most common place where fire occurs. When a fire occurs in the engine room, high-temperature smoke not only causes damage to equipment and structures through heat radiation, but also affects personnel escape and rescue operations. The generation, spread and control of fire smoke are usually dependent on factors such as combustible burning conditions, building structure and ventilation conditions, and are also affected by various factors during the generation and movement of smoke. Therefore, understanding the development law and smoke filling characteristics of engine room fires, especially the fire behavior under different ventilation conditions, is of great significance to improve the level of ship fire safety.

[0003] The existing experimental platform for ship engine room fire research mainly uses a small-scale platform, which can realize experiments such as smoke spread process in the engine room under closed conditions, liquid fire experiment in the engine room under rolling conditions, and top opening cabin fire experiment under the action of environmental wind. In order to study the smoke spread law of engine room fire under different mechanical ventilation conditions, previous researchers have developed a large-scale engine room fire experiment platform. However, such large-scale experiments require a large amount of manpower and material resources, and the experimental period is relatively long.

[0004] Small-scale model experiments can not only save research costs, but also approximately reflect the development process and fire hazard of engine room fires. However, the existing small-scale engine room experiment platform cannot meet the needs of engine room fire experiments under different mechanical ventilation (mechanical ventilation, natural ventilation) conditions, so it is necessary to invent a new engine room experiment platform and experiment method. SUMMARY

[0005] The purpose of the present application is to provide a small-scale ship engine room fire experiment platform for different ventilation conditions and an experiment method thereof, which can study the effect of ventilation on the development process of ship engine room fire, self-extinguishing behavior and fire smoke filling process under small-scale conditions.

[0006] To achieve the above purpose, the present application adopts the following technical solutions:

[0007] A small-scale ship engine room fire experiment platform for different ventilation conditions, comprising a cabin, a fire source and a measuring device;

[0008] The cabin comprises an inverted trapezoidal ship cabin 1, a lifting mechanism 2 and a mechanical ventilation system;

[0009] Fireproof glass observation windows 11 are formed in the side walls of the ship cabin 1, and a cabin door 12 is formed in the front side wall.

[0010] The ship cabin 1 is externally provided with a support frame 3 for supporting the ship cabin, the lifting mechanism 2 is arranged at the upper end of the support frame 3, and the top plate 13 of the ship cabin 1 is movably installed at the top of the ship cabin 1 through the lifting mechanism 2;

[0011] The middle part of the top plate 13 is provided with a cuboid cabin enclosure 14, the cabin enclosure 14 is through in the ship cabin 1, and the upper end of the cabin enclosure 14 is a hinged end cover;

[0012] A pair of air inlets 15 are formed in the front part of the top plate 13, and a pair of air outlets 16 are formed in the rear part of the top plate 13;

[0013] The mechanical ventilation system includes a supply fan 41 and an exhaust fan 42, the supply fan 41 is communicated with a pair of air inlets 15 through a supply air pipe 43, and the exhaust fan 42 is communicated with a pair of air outlets 16 through an exhaust air pipe 44;

[0014] A pair of diesel engine models 17 in the shape of a cuboid are arranged in parallel and at intervals in the middle part of the ship cabin 1, and a pair of exhaust pipe models in the shape of a short cylinder are arranged at the upper end of each diesel engine model;

[0015] The fire source and measuring device includes a fire source device, more than 7 thermocouple trees 51, more than one flue gas analyzer 52, and a computer system;

[0016] The fire source device includes an oil pan fire device 53 for simulating surface fire and a jet fire device 54 for simulating pipeline oil leakage point fire;

[0017] The oil pan fire device 53 is arranged in the middle part between the pair of diesel engine models 17, or on the opposite outer side of one of the diesel engine models and close to the corresponding air inlet, and the jet fire device 54 is arranged at the middle part of the opposite outer side of the other diesel engine model;

[0018] Three thermocouple trees 51 are uniformly arranged in the corresponding ship cabin 1 below the cabin enclosure 14, and a thermocouple tree 51 is arranged at each of the four right angles in the ship cabin 1, each thermocouple tree 51 includes more than 5 single thermocouples arranged vertically and uniformly;

[0019] Each oil pan fire device 53 is provided with a flue gas analyzer 52 at the outer edge of the oil pan;

[0020] During the experiment, the height of the top plate 13 is adjusted through the lifting mechanism 2, the above-mentioned fire source and measuring device are arranged, the mechanical ventilation system is turned on or off, the oil pan fire device 53 or the jet fire device 54 is ignited remotely, and the combustion experiment is carried out; the data measured by each single thermocouple and the flue gas analyzer 52 is transmitted to the computer system through a signal, and the computer system stores and analyzes the experimental data.

[0021] Further, the air supply fan 41 and the air exhaust fan 42 are both variable frequency centrifugal fans, the rated air volume of the air supply fan 41 is 161 m 3 / h; and the rated air volume of the air exhaust fan 42 is 197 m 3 / h.

[0022] Further, the lifting mechanism 2 comprises a motor 21, a transmission rod 22 and a pair of rotating rods 23, the transmission rod 22 is horizontally arranged at the front end of the support frame 3, and the pair of rotating rods 23 are horizontally arranged at the two sides of the support frame 3.

[0023] The output shaft of the motor 21 is connected to the middle part of the transmission rod 22, and the two ends of the transmission rod 22 are correspondingly connected to one end of the pair of rotating rods 23 through a pair of converters 24, and the two end parts of each rotating rod are connected to the upper end of the vertically arranged worm 26 through a lifter 25, and the lower end of each worm 26 is fixedly connected to the top plate 13.

[0024] Further, the support frame 3 comprises a cuboid-shaped frame, the frame is matched to be arranged outside the ship cabin 1, and the side surfaces of the frame are uniformly provided with reinforcing columns, and the two side inclined surfaces of the ship cabin 1 are uniformly provided with inclined braces 31.

[0025] Four air pipe supporting columns 32 are arranged on the frame, and are respectively used for supporting the horizontally overhanging sections of the air supply pipe 43 and the air exhaust pipe 44.

[0026] Further, the oil pan fire device 53 comprises an oil pan and an electronic balance, and the diameter of the oil pan is 20-40 cm.

[0027] The oil pan is arranged on the electronic balance, and the electronic balance is used to obtain the mass loss of the oil pan fire, and the fire source power is calculated based on the mass loss.

[0028] Further, the jet fire device 54 comprises a spray head, a pressure regulating valve, a pressure pump and an oil tank, and the spray head is sequentially communicated with the pressure regulating valve, the pressure pump and the oil tank through a pipeline.

[0029] The application also comprises an experimental method of a small-scale ship engine room fire experiment platform for different ventilation conditions, and specifically comprises the following steps:

[0030] Step 1): check the state of the experiment platform before the experiment, accurately connect the computer system, and record the experimental environment parameters;

[0031] Step 2): the top plate 13 is lifted by the lifting mechanism 2, the personnel enter the inside of the ship cabin 1 through the hatch 12, the thermocouple tree 51 and the smoke analyzer 52 are arranged at the measuring point, and the oil pan fire device 53 is selected according to the experimental condition A.

[0032] Step 3): Pour oil of a specified thickness into the oil pan of the oil pan fire device 53, close the hatch 12, and restore the position of the top plate 13 through the lifting mechanism 2;

[0033] Step 4): According to experimental condition A, start the mechanical ventilation system, i.e., start the air supply fan 41 and the exhaust fan 42;

[0034] Step 5): The ignition personnel perform remote ignition, and observe the inside of the ship cabin 1;

[0035] Step 6): After the fuel is burned out, stop the computer system data acquisition after 5 minutes, and store the experimental data;

[0036] Step 7): The mechanical ventilation system continues to be in an open state, the inside of the ship cabin 1 returns to a normal environment, the hatch 12 is opened, the inside of the ship cabin 1 is cleaned, and the experimental platform is reset;

[0037] Step 8): Select experimental condition B, the mechanical ventilation system is closed, the oil pan fire device 53 is selected, and steps 1) to 7) are repeated;

[0038] Step 9): Select experimental condition C, the mechanical ventilation system is closed, the upper end cover of the ship cabin surrounding well 14 is opened, i.e., the natural ventilation is opened, the oil pan fire device 53 is selected, and steps 1) to 7) are repeated;

[0039] Step 10): Select experimental condition D, the mechanical ventilation system is closed, the natural ventilation is closed, the oil pan fire device 53 is selected, and steps 1) to 7) are repeated;

[0040] Step 11): According to requirements, the jet fire device 54 is selected, different ventilation states are selected, steps 1) to 7) are repeated, and other experimental conditions are realized;

[0041] Step 12): The computer system analyzes and compares the experimental data obtained in each experimental condition, and obtains the simulation experimental law.

[0042] The beneficial technical effects of the present application are as follows:

[0043] (1) The small-scale ship engine room fire experiment platform for different ventilation conditions comprises a cabin, a fire source and a measuring device; the cabin comprises an inverted trapezoidal ship cabin, a lifting mechanism and a mechanical ventilation system; a rectangular ship cabin surrounding well is arranged in the middle of the top plate of the ship cabin, the ship cabin surrounding well and the ship cabin are through, and the upper end of the ship cabin surrounding well is a hinged end cover; a pair of air inlets are arranged in the front of the top plate, and a pair of air outlets are arranged in the rear of the top plate; the mechanical ventilation system comprises an air supply fan and an exhaust fan, the air supply fan is communicated with the pair of air inlets through an air supply pipe, and the exhaust fan is communicated with the pair of air outlets through an exhaust pipe;

[0044] When the air supply fan and the air exhaust fan are opened, the mechanical ventilation system is opened; when the air supply fan and the air exhaust fan are closed, the mechanical ventilation system is closed; when the upper end cover of the cabin well is opened, the natural ventilation is opened; when the upper end cover of the cabin well is closed, the natural ventilation is closed; therefore, the present application can study the fire behavior, smoke flow and smoke control mechanism in the small-scale engine room fire under different ventilation conditions.

[0045] (2) The top plate of the ship cabin of the present application is movably installed on the top of the ship cabin through a lifting mechanism; the top plate has a lifting function, the cabin structure size is changed by lifting the top plate, and then the common law of engine room fire under different aspect ratio conditions can be studied, and the existing cabin fire model is further verified.

[0046] (3) The present application includes a fire source and a measuring device, including a fire source device, more than 7 thermocouple trees, more than one smoke analyzer and a computer system; the fire source device includes an oil pan fire device for simulating surface fire, and a jet fire device for simulating pipeline oil leakage point fire; the mass, temperature and gas concentration of the fire source during the cabin fire can be obtained, and then the cabin fire development and smoke deposition law can be obtained.

[0047] (4) The experimental process of the present application is controllable, highly repeatable and easy to operate. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 It is a structural schematic view of a small-scale ship engine room fire experiment platform for different ventilation conditions.

[0049] Figure 2 It is a rear side view of a small-scale ship engine room fire experiment platform for different ventilation conditions.

[0050] Figure 3 It is a front view of a small-scale ship engine room fire experiment platform for different ventilation conditions.

[0051] Figure 4 It is a diesel engine model structure schematic view of a small-scale ship engine room fire experiment platform for different ventilation conditions.

[0052] Figure 5 It is a top view of a small-scale ship engine room fire experiment platform for different ventilation conditions.

[0053] Figure 6 It is a ventilation system structure schematic view of a small-scale ship engine room fire experiment platform for different ventilation conditions.

[0054] Figure 7 It is a lifting system structure schematic view of a small-scale ship engine room fire experiment platform for different ventilation conditions.

[0055] Figure 8 For the invention Figure 7 Local enlarged view.

[0056] Figure 9 For the invention, a schematic diagram of a fire source position of a small-scale ship engine room fire experiment platform for different ventilation conditions.

[0057] Figure 10 For the invention, a schematic diagram of a measurement system of a small-scale ship engine room fire experiment platform for different ventilation conditions.

[0058] Wherein: the ship cabin 1, the fireproof glass observation window 11, the cabin door 12, the top plate 13, the cabin surrounding well 14, a pair of air inlets 15, a pair of air outlets 16, a diesel engine model 17, a lifting mechanism 2, a motor 21, a transmission rod 22, a pair of rotating rods 23, a pair of converters 24, a lifter 25, a worm 26, a support frame 3, an inclined support 31, an air pipe support column 32, a blower 41, an exhaust fan 42, a supply air pipe 43, an exhaust air pipe 44, a thermocouple tree 51, a smoke analyzer 52, an oil pan fire device 53, and a jet fire device 54. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical scheme and advantages of the present application clearer and more apparent, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0060] Example 1

[0061] See Figures 1-10 A small-scale ship engine room fire experiment platform for different ventilation conditions, comprising a cabin, a fire source and a measurement device;

[0062] The cabin comprises an inverted trapezoidal ship cabin 1, a lifting mechanism 2 and a mechanical ventilation system.

[0063] Fireproof glass observation windows 11 are formed in the side walls of the ship cabin 1, and a cabin door 12 is formed in the front side wall.

[0064] A support frame 3 for supporting the ship cabin is arranged outside the ship cabin 1, the lifting mechanism 2 is arranged at the upper end of the support frame 3, and the top plate 13 of the ship cabin 1 is movably installed on the top of the ship cabin 1 by the lifting mechanism 2.

[0065] A rectangular parallelepiped cabin surrounding well 14 is arranged in the middle of the top plate 13, the cabin surrounding well 14 is connected through the ship cabin 1, and the upper end of the cabin surrounding well 14 is a hinged end cover.

[0066] A pair of air inlets 15 are formed in the front of the top plate 13, and a pair of air outlets 16 are formed in the rear of the top plate 13;

[0067] The mechanical ventilation system comprises a supply fan 41 and an exhaust fan 42, the supply fan 41 is communicated with the pair of air inlets 15 through a supply air duct 43, and the exhaust fan 42 is communicated with the pair of air outlets 16 through an exhaust air duct 44;

[0068] A pair of diesel engine models 17 in the shape of cuboids are arranged in parallel and at intervals in the middle of the ship cabin 1, and a pair of exhaust pipe models in the shape of short cylinders are arranged on the upper end of each diesel engine model;

[0069] The fire source and measuring device comprises a fire source device, more than seven thermocouple trees 51, more than one flue gas analyzer 52 and a computer system;

[0070] The fire source device comprises an oil pan fire device 53 for simulating surface fire and a jet fire device 54 for simulating pipeline oil leakage point fire;

[0071] The oil pan fire device 53 is arranged in the middle between the pair of diesel engine models 17, or on the opposite outer side of one of the diesel engine models and close to the corresponding air inlet, and the jet fire device 54 is arranged in the middle part of the opposite outer side of the other diesel engine model;

[0072] Three thermocouple trees 51 are uniformly arranged in the corresponding ship cabin 1 below the ship cabin surrounding well 14, and a thermocouple tree 51 is arranged at each of the four right angles in the ship cabin 1, each thermocouple tree 51 comprises more than five single thermocouples arranged vertically and uniformly;

[0073] The flue gas analyzer 52 is arranged at the outer edge of each oil pan fire device 53;

[0074] During the experiment, the height of the top plate 13 is adjusted by the lifting mechanism 2, the above-mentioned fire source and measuring device are arranged, the mechanical ventilation system is turned on or off, the oil pan fire device 53 or the jet fire device 54 is ignited remotely, and the combustion experiment is carried out; the data measured by each single thermocouple and the flue gas analyzer 52 is transmitted to the computer system through a signal, and the computer system stores and analyzes the experimental data.

[0075] The supply fan 41 and the exhaust fan 42 are both variable frequency centrifugal fans, the rated air volume of the supply fan 41 is 161 m 3 / h, and the rated air volume of the exhaust fan 42 is 197 m 3 / h.

[0076] The lifting mechanism 2 comprises a motor 21, a transmission rod 22 and a pair of rotating rods 23, the transmission rod 22 is horizontally arranged at the front end of the support frame 3, and the pair of rotating rods 23 are horizontally arranged at the two sides of the support frame 3;

[0077] The output shaft of the motor 21 is connected to the middle part of the transmission rod 22, the two ends of the transmission rod 22 are connected to one end of a pair of rotating rods 23 through a pair of converters 24, and the two end parts of each rotating rod are connected to the upper end of the vertically arranged worm 26 through the lifter 25, and the lower end of each worm 26 is fixedly connected with the top plate 13.

[0078] The support frame 3 comprises a cuboid-shaped frame which is arranged outside the ship cabin 1, and the side surfaces of the frame are uniformly provided with reinforcing columns, and the two side inclined surfaces of the ship cabin 1 are uniformly provided with inclined braces 31.

[0079] Four air pipe supporting columns 32 are arranged on the frame for supporting the horizontally overhanging sections of the air supply pipe 43 and the air exhaust pipe 44.

[0080] The oil pan fire device 53 comprises an oil pan and an electronic balance, and the diameter of the oil pan is 20-40 cm.

[0081] The oil pan is arranged on the electronic balance, and the electronic balance is used to obtain the mass loss of the oil pan fire and calculate the fire source power based on the mass loss.

[0082] The jet fire device 54 comprises a spray head, a pressure regulating valve, a pressure pump and an oil tank, and the spray head is connected to the pressure regulating valve, the pressure pump and the oil tank in sequence through a pipeline.

[0083] Example 2

[0084] The experimental method of the small-scale ship engine room fire experiment platform for different ventilation conditions in Example 1 specifically comprises the following steps:

[0085] Step 1): Check the state of the experimental platform before the experiment, and accurately connect the computer system, and record the experimental environment parameters;

[0086] Step 2): Raise the top plate 13 through the lifting mechanism 2, and personnel enter the inside of the ship cabin 1 through the cabin door 12, and arrange the thermocouple tree 51 and the smoke analyzer 52 at the measuring point; select the oil pan fire device 53 according to the experimental condition A;

[0087] Step 3): Pour the oil of the specified thickness into the oil pan of the oil pan fire device 53, close the cabin door 12, and restore the position of the top plate 13 through the lifting mechanism 2;

[0088] Step 4): According to the experimental condition A, start the mechanical ventilation system, that is, start the air supply fan 41 and the air exhaust fan 42;

[0089] Step 5): The ignition personnel perform remote ignition, and observe the inside of the ship cabin 1;

[0090] Step 6): After the fuel is burned out, stop the computer system data acquisition after 5 minutes, and store the experimental data;

[0091] Step 7) The mechanical ventilation system continues to be kept in an open state, and when the internal environment condition of the ship cabin 1 returns to normal, the cabin door 12 is opened, the inside of the ship cabin 1 is cleaned, and the experimental platform is reset;

[0092] Step 8) Selecting the experimental condition B, the mechanical ventilation system is closed, the oil pan fire device 53 is selected, and steps 1) to 7) are repeated;

[0093] Step 9) The computer system analyzes and compares the experimental data obtained in each experimental condition, and obtains Table 1;

[0094] Table 1 Comparison curve of experimental characteristic values of conditions A and B

[0095]

[0096] As can be seen from Table 1, the average mass loss rate and the peak mass loss rate of condition A are both significantly greater than those of condition B. The vertical peak temperature and the maximum average temperature in the cabin of condition A are both significantly higher than those of condition B. The oxygen reduction amount of condition A is significantly less than that of condition B, and the increase amount of carbon monoxide is significantly less than that of condition B. The increase amount of carbon dioxide of condition A is significantly less than that of condition B. It can be seen from the mass loss change curve that the opening of the mechanical ventilation has a significant promoting effect on the combustion of the oil pool. The main reason is that the mechanical ventilation is opened, and the oxygen is continuously supplied to the pool fire combustion. Under the condition that other boundary conditions are the same, opening the mechanical ventilation will help the combustion of the pool fire, and the combustion rate will be greater.

[0097] Therefore, the device can effectively simulate the development process of the ship cabin fire, and provide data support for the development and practice of ship fire prevention and ship safety technology.

[0098] Those skilled in the art will readily understand that the above description is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A small scale ship engine room fire test platform for different ventilation conditions, characterized by: The ship cabin comprises a cabin and a fire source and a measuring device; The ship cabin comprises an upside-down trapezoidal ship cabin (1), a lifting mechanism (2) and a mechanical ventilation system; The ship cabin (1) is provided with fireproof glass observation windows (11) on the side surfaces, and a cabin door (12) is arranged on the front side surface; The ship cabin (1) is provided with a support frame (3) for supporting the ship cabin, the lifting mechanism (2) is arranged at the upper end of the support frame (3), and the top plate (13) of the ship cabin (1) is movably arranged on the top of the ship cabin (1) by the lifting mechanism (2); The top plate (13) is provided with a rectangular cuboid cabin surrounding well (14) in the middle, the cabin surrounding well (14) is connected with the ship cabin (1), and the upper end of the cabin surrounding well (14) is a hinged upper end cover; A pair of air inlets (15) are arranged on the front part of the top plate (13), and a pair of air outlets (16) are arranged on the rear part of the top plate (13); The mechanical ventilation system comprises a blower (41) and an exhaust fan (42), the blower (41) is connected with the pair of air inlets (15) by a blower pipe (43), the exhaust fan (42) is connected with the pair of air outlets (16) by an exhaust pipe (44), and the blower pipe (43) and the exhaust pipe (44) are both telescopic air pipes; A pair of diesel engine models (17) are arranged in parallel and at intervals in the middle of the ship cabin (1), and each diesel engine model is provided with a pair of short cylindrical exhaust pipe models at the upper end; The fire source and measuring device comprises a fire source device, more than seven thermocouple trees (51), more than one flue gas analyzer (52) and a computer system; The fire source device comprises an oil pan fire device (53) for simulating fuel leakage and ignition on the bottom surface, and a jet fire device (54) for simulating pipeline fuel leakage and ignition; The oil pan fire device (53) is arranged in the middle between the pair of diesel engine models (17), or on the opposite outer side of one of the diesel engine models and close to the corresponding air inlet, and the jet fire device (54) is arranged at the middle part of the opposite outer side of the other diesel engine model; Three thermocouple trees (51) are uniformly arranged in the corresponding ship cabin (1) below the cabin surrounding well (14), and a thermocouple tree (51) is arranged at each of the four right angles in the ship cabin (1), each thermocouple tree (51) comprises more than five single thermocouples arranged vertically; Each oil pan fire device (53) is provided with a flue gas analyzer (52) at the outer edge of the oil pan; During the experiment, the height of the top plate (13) is adjusted by the lifting mechanism (2), the above-mentioned fire source and measuring device are arranged, the mechanical ventilation system is turned on or off, the oil pan fire device (53) or the jet fire device (54) is ignited remotely, and the combustion experiment is carried out; the data measured by each single thermocouple and the flue gas analyzer (52) is transmitted to the computer system by signal, and the computer system stores and analyzes the experimental data.

2. The small scale ship engine room fire test platform for different ventilation conditions according to claim 1, characterized in that: The air supply fan (41) and the air exhaust fan (42) are both variable frequency centrifugal fans, the rated air volume of the air supply fan (41) is 161 m 3 / h; the rated air volume of the air exhaust fan (42) is 197 m 3 / h.

3. The small scale ship engine room fire test platform for different ventilation conditions according to claim 1, characterized in that: The lifting mechanism (2) comprises a motor (21), a transmission rod (22) and a pair of rotating rods (23), the transmission rod (22) is horizontally arranged at the front end of the support frame (3), and the pair of rotating rods (23) are horizontally arranged at the two sides of the support frame (3); The output shaft of the motor (21) is connected with the middle part of the transmission rod (22), the two ends of the transmission rod (22) are correspondingly connected with one end of the pair of rotating rods (23) through a pair of converters (24), and the two end parts of each rotating rod are connected with the upper end of the vertically arranged worm (26) through a lifter (25).

4. The small scale ship engine room fire test platform for different ventilation conditions of claim 1, wherein: The support frame (3) comprises a cuboid-shaped frame, the frame is arranged outside the ship cabin (1), and the side surfaces of the frame are uniformly provided with reinforcing columns, and the two side inclined surfaces of the ship cabin (1) are uniformly provided with inclined braces (31); Four air pipe supporting columns (32) are arranged on the frame and are used for supporting the horizontally suspended sections of the air supply pipe (43) and the air exhaust pipe (44).

5. The small scale ship engine room fire test platform for different ventilation conditions according to claim 1, characterized in that: The oil pan fire device (53) comprises an oil pan and an electronic balance, the diameter of the oil pan is 20-40 cm; the oil pan is arranged on the electronic balance, and the electronic balance is used to obtain the mass loss of the oil pan fire and calculate the fire source power based on the mass loss.

6. The small scale ship engine room fire test platform for different ventilation conditions of claim 1, wherein: The jet fire device (54) comprises a spray head, a pressure regulating valve, a pressure pump and an oil tank, and the spray head is sequentially connected with the pressure regulating valve, the pressure pump and the oil tank through pipelines.

7. The test method of the small-scale ship cabin fire experiment platform for different ventilation conditions according to any one of claims 1-6, specifically comprising the following steps: Step (1): checking the state of the experiment platform and the accurate connection of the computer system before the experiment, and recording the experimental environment parameters; Step (2): raising the top plate (13) through the lifting mechanism (2), and personnel enter the inside of the ship cabin (1) through the hatch (12), and arranging the thermocouple tree (51) and the smoke analyzer (52) at the measuring point; selecting the oil pan fire device (53) according to the experimental condition A; Step (3): pouring the oil of a specified thickness into the oil pan of the oil pan fire device (53), closing the hatch (12), and restoring the position of the top plate (13) through the lifting mechanism (2); Step (4): according to the experimental condition A, starting the mechanical ventilation system, that is, starting the air supply fan (41) and the air exhaust fan (42); Step (5): a person ignites remotely, and observes the inside of the ship cabin (1); Step (6): after the fuel is burned out, the computer system data acquisition is stopped after 5 minutes, and the experimental data is stored; Step (7): the mechanical ventilation system continues to be kept in the open state, the hatch (12) is opened when the inside environment of the ship cabin (1) returns to the normal environment, the inside of the ship cabin (1) is cleaned, and the experiment platform is reset; Step (8): selecting the experimental condition B, closing the mechanical ventilation system, selecting the oil pan fire device (53), and repeating steps (1)-(7); Step (9): selecting the experimental condition C, closing the mechanical ventilation system, opening the upper end cover of the ship cabin surrounding well (14), that is, opening the natural ventilation, selecting the oil pan fire device (53), and repeating steps (1)-(7). Step (10): Selecting experimental condition D, mechanical ventilation system is closed, natural ventilation is closed, selecting oil pan fire device (53), repeating steps (1)-(7); Step (11): Selecting jet fire device (54) according to requirements, selecting different ventilation states, repeating steps (1)-(7), realizing other experimental conditions; Step (12): Computer system analyzing and comparing experimental data obtained from each experimental condition, obtaining simulation experimental law.

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