Water-based film-forming foam extinguishing system and anti-settling / delamination method and liquid level detection method

Abstract

The application relates to the field of water film forming foam fire extinguishing systems, in particular to a water film forming foam fire extinguishing system and a sedimentation / lamination prevention method and a liquid level detection method. The water film forming foam fire extinguishing system comprises a base and a first main plate, the first main plate is provided with an annular sliding rail; a second main plate is provided with a sliding block and a first belt wheel, the sliding block is provided with a limiting pulley; a servo motor drives a second belt wheel; a first foam liquid tank is provided with a first liquid inlet end and a first liquid outlet end at one end; a first piston piece is provided with a liquid inlet and a gas outlet; a second foam liquid tank is provided with a second liquid inlet end and a second liquid outlet end; a second piston piece is provided with a liquid outlet; a proportional mixer is communicated with the liquid outlet at one end; a foam generating device is communicated with the other end of the proportional mixer; and the foam generating device is connected with a spray gun.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water film forming foam fire extinguishing system, in particular to a water film forming foam fire extinguishing system, a water film forming foam liquid anti-settling / layering method and a water film forming foam liquid liquid level detection method. BACKGROUND

[0002] A foam fire extinguishing system generally consists of a foam liquid storage tank, a foam fire pump, a foam proportioning device, a foam generating device, a fire detection and start-up control device, control valves and pipelines, and other system components. It effectively combines fire hydrants with water film forming foam fire extinguishing and is widely used in places suitable for self-rescue, such as highway tunnels, underground garages, gas stations, small oil depots, warehouses, ships, power plants, high-rise and large buildings, and places where large fixed fire fighting equipment is not suitable for installation.

[0003] Foam fire extinguishing systems can be divided into fixed, semi-fixed and mobile types. Fixed systems are usually installed in buildings or facilities and can be started automatically or manually. Semi-fixed systems consist of a fixed foam generator, part of the connecting pipeline, a foam fire truck or a mobile pump, and a water hose connected to form a fire extinguishing system. Mobile systems consist of a fire truck, a mobile fire pump or a pressurized water source, a foam proportioning device, a foam gun, a foam cannon or a mobile foam generator, and a water hose connected to form a fire extinguishing system. These three systems have their own advantages and suitable scenarios, and the most suitable system can be selected according to the specific fire situation and environmental conditions.

[0004] Water film forming foam extinguishing agent is a fire extinguishing agent used to extinguish fires. Water-soluble film forming foam extinguishing agent has the film forming property of water film forming foam extinguishing agent and the anti-dissolution property of water-soluble foam extinguishing agent. Water film forming foam extinguishing agent forms a foam cover layer on the fire source to isolate the contact between the fire source and oxygen, thereby suppressing the spread of the flame and cooling the fire source to achieve the purpose of extinguishing the fire. Water film forming foam extinguishing agent is mainly used to extinguish liquid fires, especially flammable liquids such as petroleum, oil, solvent, etc. The formation of foam can effectively suppress the flame and reduce the risk of fire spread. This method of extinguishing the fire also helps to reduce the temperature of the fire source, thereby reducing the possibility of re-ignition. The principle is that when pressure water flows through the proportioning device of the foam fire hydrant box at a high speed, a negative pressure is formed in the chamber of the proportioning device. The foam liquid in the storage tank enters the mixer through the suction pipe under the action of atmospheric pressure and mixes with the pressure water to form a mixture with a certain proportion. When the mixture with a certain pressure flows to the foam generating device, the foam mixture is foamed and sprayed from the lance, thereby achieving the effect of foam fire extinguishing.

[0005] Generally speaking, any fire extinguishing agent that can be mixed with water and can produce fire extinguishing foam by chemical reaction or mechanical method is called foam fire extinguishing agent. In detail, foam fire extinguishing agent is generally composed of foaming agent, foam stabilizer, viscosity reducer, antifreeze, cosolvent, preservative and water. There are many types of aqueous film-forming foam, including: protein foam, code: P; fluoroprotein foam, code: FP; synthetic foam, code: S; antiflushing foam, code: AR; aqueous film-forming foam, code: AFFF; film-forming fluoroprotein foam, code: FFFP; antiflushing protein foam, code: P / AR; antiflushing fluoroprotein foam, code: FP / AR; antiflushing synthetic foam, code: S / AR; antiflushing aqueous film-forming foam, code: AFFF / AR; antiflushing film-forming fluoroprotein foam, code: FFFP / AR; medium expansion foam, code: Z; high expansion foam, code: G; high and low expansion foam, code: GZD; antiflushing high and low expansion foam, code: GZD / AR. In application, different types of foam fire extinguishing liquid can be selected according to different types of fire or needs.

[0006] However, the current aqueous film-forming foam fire extinguishing system still has at least the following problems:

[0007] 1. During storage, the foam liquid is usually stored in an environment of 0~40C. Whether the temperature is too high or too low will have a strong negative impact on the quality and storage period of the foam liquid. If the storage temperature is too high, the foam extinguishing agent will deteriorate. On the contrary, if the temperature is too low, the frozen foam extinguishing agent will be frozen and thus lose its effectiveness. And it will cause the pH value to change. Therefore, due to temperature changes, aging, freezing and thawing, etc., the components of the foam liquid will separate, resulting in visible stratification and heterogeneous phenomena, thereby affecting the performance and stability of the foam liquid and reducing the extinguishing effect;

[0008] 2. The precipitate of the aqueous film-forming foam liquid needs to pass through a 180μm sieve. During storage, precipitates may be produced due to aging, microbial contamination, impurities mixed in, including insoluble solid substances present in the foam liquid, etc. Therefore, the storage place should be kept ventilated and dry to avoid direct sunlight and prevent impurities and other substances from mixing in. If impurities are mixed in during use, etc., the volume percentage of the precipitate should not exceed the specified limit, otherwise it will block the foam proportioning mixer and foam generator, affecting the generation and delivery of foam;

[0009] 3. The foam liquid tank is a new breakthrough of foam extinguishing product, which plays a crucial role in fire extinguishing. The role of the foam liquid tank is to store foam liquid, which requires the foam liquid tank to be filled with foam liquid after each use and to check whether there is enough foam liquid in the tank before use to avoid insufficient foam liquid during fire extinguishing. At the same time, attention should be paid to the remaining foam liquid during use, especially for semi-fixed and mobile foam extinguishing systems, which require more attention to avoid sudden lack of foam liquid during use. Therefore, the liquid level detection is extremely important, and the existing liquid level detection products are various, such as: float type liquid level meter, pressure type liquid level meter, ultrasonic liquid level meter…etc. These existing products are only suitable for liquid level detection of foam liquid tank in static state. In semi-fixed and mobile foam extinguishing systems, that is, for fire trucks or other mobile fire extinguishing systems, in the case of moving and extinguishing at the same time according to the needs of the fire, the foam liquid tank is in a state of violent shaking, and the liquid in the tank is also shaking left and right. And the vehicle or equipment is also shaking and tilting during movement. Therefore, under this condition, the existing liquid level detection products cannot accurately detect the liquid level in the tank, which makes it impossible to accurately understand the accurate liquid level of the foam liquid in the foam liquid tank during the fire extinguishing process.

[0010] 4. There is a contradictory problem in the frequency of use of aqueous film-forming foam. That is: whether it is in a static environment for a long time or in a shaking environment for a long time, it has different disadvantages. If the aqueous film-forming foam is in a quiet environment for a long time, it may cause the increase of foam sediment, and the decrease of foam flowability and fire extinguishing performance. Therefore, the foam should be stirred or circulated regularly to make it mix evenly and avoid the accumulation of sediment. But for the aqueous film-forming foam already in the tank, it cannot be stirred without pouring it out. And it is too high in time and labor cost to stir it out. And even if it is poured out, it is not easy to stir it. On the other hand, if the aqueous film-forming foam is in a shaking environment for a long time, it may cause the increase of foam bubbles, and the decrease of foam concentration and fire extinguishing performance. Therefore, in order to avoid sediment, regular stirring is required, and too much shaking will affect the concentration and performance of the foam. This is a contradictory problem that cannot be solved in storage!

[0011] 5. The existing aqueous foam tank, when the foam liquid remaining in the tank is not much, especially for mobile foam extinguishing systems such as fire trucks, for some large fires, the vehicle will be moving and extinguishing at the same time. Therefore, during the movement, the foam liquid in the foam liquid tank is shaking, which will cause the foam liquid to be intermittently discharged from the liquid outlet, resulting in intermittent failure to extract foam liquid. SUMMARY

[0012] The present application aims to solve at least part of the above existing problems and bring corresponding technical effects.

[0013] To solve the above technical problems, the water film forming foam fire extinguishing system comprises:

[0014] A base is provided with a first main plate fixedly connected, and the first main plate is at a vertical angle; the surface of the first main plate is provided with an annular slide rail fixedly connected;

[0015] A second main plate is provided at a parallel angle with the first main plate; the back surface of the second main plate is provided with a sliding block fixedly connected, and the sliding block is provided with a limiting pulley movably connected; the annular slide rail is at least partially between the sliding block and the limiting pulley; the second main plate is provided with a first pulley fixedly connected, and the first pulley surrounds the edge of the second main plate;

[0016] A servo motor is fixedly installed on the base; the power output shaft of the servo motor drives a second pulley, and the first pulley and the second pulley are connected through a transmission belt;

[0017] A first foam liquid tank is fixedly installed on the surface of the second main plate; one end of the first foam liquid tank is provided with a first liquid inlet end, and the other end is provided with a first liquid outlet end;

[0018] A first piston member is slidably installed on the first liquid inlet end, and the first piston member is liquid-tightly sealed with the inner wall of the first foam liquid tank; the first piston member is provided with a liquid inlet and a gas outlet;

[0019] A second foam liquid tank is fixedly installed on the surface of the second main plate; the second foam liquid tank is at a vertical same axis with the first foam liquid tank; the second foam liquid tank is provided with a second liquid inlet end at one end close to the first foam liquid tank, and the second liquid inlet end is communicated with the first liquid outlet end; the second foam liquid tank is provided with a second liquid outlet end at one end away from the first foam liquid tank;

[0020] A second piston member is slidably installed on the second liquid outlet end, and the second piston member is liquid-tightly sealed with the inner wall of the first foam liquid tank; the second piston member is provided with a liquid outlet;

[0021] A proportional mixer is fixedly installed on the base; one end of the proportional mixer is communicated with the liquid outlet;

[0022] A foam generating device is communicated with the other end of the proportional mixer; the foam generating device is connected with a spray gun.

[0023] As a preferred embodiment of the water film forming foam fire extinguishing system, the servo motor is connected with a reduction gearbox, and the second pulley is installed on the power output shaft of the reduction gearbox.

[0024] As a preferred embodiment of the water film forming foam fire extinguishing system, the outer part of the first piston and the second piston respectively has at least one power push rod, and the telescopic rod end of the power push rod abuts against the surface of the first piston and / or the second piston.

[0025] The power push rod is fixedly connected with the second main plate.

[0026] As a preferred embodiment of the water film forming foam fire extinguishing system, a shell is fixedly connected with the base and surrounds the first main plate.

[0027] As a preferred embodiment of the water film forming foam fire extinguishing system, a partition piece is provided, and the cross section of the partition piece is in the shape of "x"; the partition piece is at least partially located in the first foam liquid tank and the second foam liquid tank, respectively.

[0028] The partition piece forms a flow guide groove between the inner wall of the first foam liquid tank and the second foam liquid tank.

[0029] The center of the partition piece has a flow guide hole.

[0030] As a preferred embodiment of the water film forming foam fire extinguishing system, a transfer tank is provided, and one end of the transfer tank is communicated with the liquid outlet of the second foam liquid tank, and the other end of the transfer tank is communicated with the liquid inlet of the proportional mixer.

[0031] A spring is provided, and one end of the spring is fixedly connected with the transfer tank, and the other end of the spring is fixedly connected with the base.

[0032] As a preferred embodiment of the water film forming foam fire extinguishing system, the first piston and the second piston respectively have a fixedly connected liquid level slide rod, and the side surface of the liquid level slide rod has a pressing table.

[0033] A switch sleeve fixedly connected with the second main plate is provided, and the switch sleeve has at least three trigger switches at different heights.

[0034] The liquid level slide rod is slidingly installed in the switch sleeve; when the pressing table and the trigger switch are at the same horizontal position, the pressing table abuts against the trigger switch and pushes the trigger switch.

[0035] The water film forming foam liquid anti-settling / delamination method comprises the following steps:

[0036] (1). The water film forming foam fire extinguishing system of any one of the above;

[0037] (2). The first piston member in the water film forming foam fire extinguishing system is in fixed or sliding connection with the first foam liquid tank; the second piston member in the water film forming foam fire extinguishing system is in fixed or sliding connection with the second foam liquid tank;

[0038] (3). Obtain the start-up use information of the water film forming foam fire extinguishing system, and take each shutdown time of the water film forming foam fire extinguishing system as a new timing start time;

[0039] (4). Start from the timing start time, when the predetermined time is reached, under the driving of the servo motor in the water film forming foam fire extinguishing system, through the use of the first pulley, the second pulley and the transmission belt, the second mainboard is driven to rotate 180 degrees along the annular slide rail and stay for a predetermined flow time, so that the second foam liquid tank in the water film forming foam fire extinguishing system is vertically above the first foam liquid tank, and the fluid and sediment in the first foam liquid tank and the second foam liquid tank are circulated for the first time;

[0040] (5). When the predetermined flow time is reached, rotate to reset, so that the second foam liquid tank is again vertically below the first foam liquid tank for the second time circulation;

[0041] (6). When the water film forming foam fire extinguishing system continues to be used without starting again, take the second time circulation of the last time as a new timing start time; repeat steps (4) and (5);

[0042] Or:

[0043] When the water film forming foam fire extinguishing system is used again, steps (3), (4) and (5) are executed.

[0044] The liquid level detection method of the water film forming foam liquid of the application comprises the following steps:

[0045] (1). The water film forming foam fire extinguishing system of any one of the above;

[0046] (2). Seal the liquid inlet and gas outlet of the water film forming foam fire extinguishing system, and set a one-way valve at the liquid outlet;

[0047] (3). Through the liquid outlet, the water film forming foam liquid in the first foam liquid tank and the second foam liquid tank in the water film forming foam fire extinguishing system is extracted, the negative pressure of extracting the water film forming foam liquid is used to make the first piston piece and / or the second piston piece slide with the change of the liquid level, so as to drive the liquid level sliding rod in the water film forming foam fire extinguishing system to move up and down; the first piston piece and the second piston piece connected in sliding are used to reduce the hollow area in the first foam tank and the second foam tank, so as to reduce the shaking of the water film forming foam liquid in the first foam tank and the second foam tank;

[0048] (4). The trigger switch in the water film forming foam fire extinguishing system is connected with the external sound playing device and / or the alarm lamp;

[0049] (5). When the pressing table of the liquid level sliding rod in the water film forming foam fire extinguishing system abuts against the trigger switch, the power supply is turned on, the external sound playing device and / or the alarm lamp are started, and the alarm information is sent.

[0050] As a preferred embodiment of the liquid level detection method of the water film forming foam liquid, the following steps are included:

[0051] (1). The volume information of the water film forming foam liquid flowed out from the liquid outlet in the water film forming foam fire extinguishing system is obtained;

[0052] (2). The residual amount information of the water film forming foam liquid in the first foam liquid tank and the second foam liquid tank is obtained according to the position information of the first piston piece and the second piston piece in the water film forming foam fire extinguishing system;

[0053] Or:

[0054] The residual amount information of the water film forming foam liquid in the first foam liquid tank and the second foam liquid tank is obtained according to the alarm information of the trigger switch in the water film forming foam fire extinguishing system;

[0055] (3). The volume information in step (1) is used to compare and review the residual amount information in step (2). Beneficial effects

[0056] The present application solves the above existing problems and other existing problems not mentioned above and accordingly brings at least the following innovative advantages:

[0057] The water film forming foam fire extinguishing system, the water film forming foam liquid anti-settling / layering method and the water film forming foam liquid liquid level detection method, through the annular slide rail arranged above the first main plate, the second main plate can be rotated with the annular slide rail as a guide rail through the sliding block and the limiting pulley; so as to directly drive the first foam liquid tank and the second foam liquid tank fixedly installed above the second main plate synchronously, the first foam liquid tank and the second foam liquid tank can be rotated under the driving of the second main plate, the positions of the first foam liquid tank and the second foam liquid tank are exchanged, the first foam liquid tank is above or the second foam liquid tank is above; finally, the water film forming foam liquid in the foam liquid tank above can flow into the foam liquid tank below. In actual use, the first foam liquid tank and the second foam liquid tank can be filled with water film forming foam liquid at the same time, at this time, when the upper and lower positions of the first foam liquid tank and the second foam liquid tank are exchanged by 180 degrees, the internal sediment flows, the sediment is dispersed, and the internal water film forming foam liquid is more uniform. In addition, in actual use, only one of the first foam liquid tank and the second foam liquid tank has water film forming foam liquid, and the other is a hollow structure, at this time, when the upper and lower positions of the first foam liquid tank and the second foam liquid tank are exchanged by 180 degrees, the water film forming foam liquid in the foam liquid tank above can flow into the foam liquid tank below like an hourglass, so that the concentration of the internal water film forming foam liquid is more uniform, and the problems of layering and sedimentation of the water film forming foam liquid placed for a long time at present are solved. By rotating the first foam liquid tank and the second foam liquid tank to make the internal liquid uniform, the problem of the contradiction that excessive shaking affects the concentration and performance of the foam liquid is also solved.

[0058] The water film forming foam fire extinguishing system, the water film forming foam liquid anti-settling / layering method and the water film forming foam liquid liquid level detection method, since the first piston piece is slidingly connected in the first foam liquid tank and the second piston piece is slidingly connected in the second foam liquid tank, when the water film forming foam liquid in the first foam liquid tank and the second foam liquid tank is sucked away, the first piston piece and the second piston piece can slide inward under negative pressure with the change of the liquid level, so that there is no excessive hollow area in the first foam liquid tank and the second foam liquid tank, when applied to a mobile fire extinguishing system, there is not enough shaking space for the liquid in the tank, therefore, when there is not much foam liquid left, the foam liquid will not shake, and the problem that the foam liquid in the foam liquid tank of the mobile foam fire extinguishing system shakes and intermittently separates from the liquid outlet during movement, causing intermittent failure to extract foam liquid, is solved.

[0059] The water film forming foam fire extinguishing system, the water film forming foam liquid anti-settling / lamination method and the water film forming foam liquid liquid level detection method, by increasing the power push piece of the first piston piece and the second piston piece respectively, and the moving speed of the first piston piece and the second piston piece is equal or similar, so that the power push rod can assist the first piston piece and the second piston piece.

[0060] The water film forming foam fire extinguishing system, the water film forming foam liquid anti-settling / lamination method and the water film forming foam liquid liquid level detection method, by further setting the separation piece, the first foam liquid tank and the second foam liquid tank have two overflow channels between them, one is a flow guide hole, the other is a flow guide groove, so that when the first foam liquid tank and the second foam liquid tank are rotated by 180 degrees with the second main plate, and when one of the first foam liquid tank and the second foam liquid tank has liquid and the other is hollow without liquid, the flow guide hole and the flow guide groove two overflow channels can better facilitate the flow of different fluids.

[0061] The water film forming foam fire extinguishing system, the water film forming foam liquid anti-settling / lamination method and the water film forming foam liquid liquid level detection method, by further setting the transfer tank, so that when the first foam liquid tank and the second foam liquid tank appear emergency situation in the process of rotation, the foam liquid stored in the transfer tank can provide a certain time supply; and because the transfer tank is set on the spring, when used on the high-speed tunnel or fire truck, it can absorb the vibration of the large truck on the highway or the shaking in the driving process of the fire truck, so that the whole transfer tank shakes up, to solve the problem of foam liquid settlement and stratification in the transfer tank.

[0062] The water film forming foam fire extinguishing system, the water film forming foam liquid anti-settling / lamination method and the water film forming foam liquid liquid level detection method, by setting the fixed connection liquid level slide rod on the first piston piece and the second piston piece respectively, and setting the pressing table on the liquid level slide rod, and setting the switch slide sleeve fixedly connected with the second main plate, so that the liquid level slide rod can slide up and down with the first piston piece and the second piston piece, when sliding to different positions, the pressing table will press the trigger switch on the switch slide sleeve at different heights, at this time, at least three trigger switches can be electrically connected with the external sound playing device and / or alarm lamp, when pressing different trigger switches, different sound playing devices and / or alarm lamps are opened, so as to provide liquid level height prompt to the staff; and because the first piston piece and the second piston piece are slidingly connected with the first foam liquid tank and the second foam liquid tank, the first piston piece and the second piston piece can slide inwardly under negative pressure following the change of liquid level, at this time, the measurement accuracy of the liquid level is greatly improved, solving the problem that the foam liquid tank and the foam liquid are in a shaking state and cannot accurately detect the liquid level in the tank in the case of moving fire extinguishing and using at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0063] Figure 1 is a perspective view of the present invention;

[0064] Figure 2 is a front view of the present invention; Figure 1

[0065] Figure 3 is a sectional view of the present invention at "A-A" position; Figure 2

[0066] Figure 4 is a sectional view of the present invention at "B-B" position; Figure 3

[0067] Figure 5 is an exploded view of the present invention;

[0068] Figure 6 is an enlarged view of "A" area in the present invention; Figure 3

[0069] Figure 7 is an enlarged view of "B" area in the present invention; Figure 4

[0070] Figure 8 is an enlarged view of "C" area in the present invention; Figure 4

[0071] Figure 9 is an enlarged view of "D" area in the present invention; Figure 4

[0072] Figure 10 is an enlarged view of "E" area in the present invention; Figure 5

[0073] Figure 11 is an enlarged view of "F" area in the present invention; Figure 9

[0074] Figure 12 is an enlarged view of "first foam liquid tank" and "second foam liquid tank" of the present invention;

[0075] Figure 13 is an enlarged view of "first piston member" of the present invention.

[0076] ​​​​​​​​​In the figure: 1. base, 2. first main plate, 3. annular slide rail, 4. second main plate, 5. sliding block, 6. limiting pulley, 7. first pulley, 8. servo motor, 9. second pulley, 10. transmission belt, 11. first foam liquid tank, 12. first liquid inlet, 13. first liquid outlet, 14. first piston piece, 15. liquid inlet, 16. gas outlet, 17. second foam liquid tank, 18. second liquid inlet, 19. second liquid outlet, 20. second piston piece, 21. liquid outlet, 22. proportional mixer, 23. foam generating device, 24. spray gun, 25. reduction box, 26. power push rod, 27. shell, 28. partition piece, 29. flow guide groove, 30. flow guide hole, 31. transfer tank, 32. spring, 33. liquid level slide rod, 34. pressing table, 35. switch sliding sleeve, 36. trigger switch. DETAILED DESCRIPTION

[0077] In order to make the purpose, technical scheme and advantages of the technical scheme of the present disclosure clearer, the technical scheme of the embodiments of the present disclosure will be described clearly and completely below in combination with the drawings of the embodiments of the present disclosure.

[0078] The same reference signs in the drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments.

[0079] Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0080] (The present invention will be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams and only show the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention) Embodiment 1

[0081] As Figures 1 to 13 shown, the water film forming foam fire extinguishing system of the present disclosure comprises:

[0082] a base 1, see Figure 5 , the base 1 has a fixedly connected first main plate 2, the first main plate 2 is at a vertical angle; the surface of the first main plate 2 has a fixedly connected annular slide rail 3;

[0083] a second main plate 4, Figure 3 and Figure 6 exhibits that the second main plate 4 is at a parallel angle with the first main plate 2; Figure 6 exhibits that the back of the second main plate 4 has a fixedly connected sliding block 5, the sliding block 5 is provided with a movably connected limiting pulley 6, as Figure 6As shown, the limiting pulley 6 is movably mounted on the connecting shaft that is fixedly connected to the slider 5; see also Figure 6 The annular slide rail 3 is at least partially located between the slider 5 and the limiting pulley 6. Figure 6 The cross-section of the circular slide rail 3 is shown to be T-shaped; see [link / reference]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The second motherboard 4 has a first pulley 7 fixedly connected to it, which surrounds the edge of the second motherboard 4;

[0084] Servo motor 8, such as Figures 1 to 4 As shown, the servo motor 8 is fixedly mounted on the base 1. Furthermore, Figure 1 This demonstrates how the servo motor 8 is fixedly mounted to the base 1 using an L-shaped plate; as shown. Figure 1 As shown, the power output shaft of the servo motor 8 drives the second pulley 9, which is connected to the first pulley 7 via a transmission belt 10. Figure 5 The overall effect of the transmission belt 10 is shown;

[0085] First foam liquid tank 11, Figures 1 to 4 The first foam liquid tank 11 is shown fixedly mounted on the surface of the second main board 4; see also Figure 4 and Figure 12 The first foam liquid tank 11 has a first inlet end 12 at one end and a first outlet end 13 at the other end, see [reference]. Figure 12 The first liquid outlet 13 is the connection point between the bottom of the first foam box 11 and the second foam box 17;

[0086] First piston component 14, see [link] Figure 4 and Figure 7 The first piston 14 is slidably mounted on the first liquid inlet end 12, and the first piston 14 is liquid-sealed with the inner wall of the first foam liquid tank 11. Figure 13 The first piston component 14 is shown to have a liquid inlet 15 and an air outlet 16; the liquid inlet 15 and the air outlet 16 are respectively in an open state when water-based film-forming foam liquid is added, and are respectively in a sealed state when the addition is completed.

[0087] Second foam liquid tank 17 Figures 1 to 4 The second foam liquid tank 17 is shown to be fixedly mounted on the surface of the second main board 4; as shown Figure 2 , Figure 3 and Figure 4As shown, the second foam liquid tank 17 is in vertical same axis with the first foam liquid tank 11; the second foam liquid tank 17 has a second liquid inlet end 18 near one end of the first foam liquid tank 11, see Figure 12 , the second liquid inlet end 18 is the connection between the second foam liquid tank 17 and the first liquid tank 11; the second liquid inlet end 18 is communicated with the first liquid outlet end 13; the second foam liquid tank 17 has a second liquid outlet end 19 away from the first foam liquid tank 11, that is Figure 12 the port below the second foam tank 17 is the second liquid outlet end 19;

[0088] In this embodiment, the first foam liquid tank 11 and the second foam liquid tank 17 are preferably cylindrical structures, and the first liquid outlet end 13 and the second liquid inlet end 18 are respectively conical in shape, so that the diameters of the first liquid outlet end 13 and the second liquid inlet end 18 are smaller than the diameters of the main body parts of the first foam liquid tank 11 and the second foam liquid tank 17;

[0089] A second piston member 20, see Figure 4 and Figure 9 The second piston member 20 is slidingly installed in the second liquid outlet end 19, and the second piston member 20 is liquid-tightly sealed with the inner wall of the first foam liquid tank 11; in addition, the first piston member 14 and the second piston member 20 can be further provided with a gasket, see Figure 9 The second piston member 20 has a liquid outlet 21;

[0090] A proportional mixer 22, see Figure 1 , Figure 2 and Figure 4 The proportional mixer 22 is fixedly installed in the base 1; one end of the proportional mixer 22 is communicated with the liquid outlet 21;

[0091] A foam generating device 23, which is communicated with the other end of the proportional mixer 22; the foam generating device 23 is connected with a spray gun 24.

[0092] Further, the first foam liquid tank 11 and the first piston member 14 can be further changed to fixed connection, so that the position of the first piston member 14 cannot slide; when it is fixed connection, see Figures 1 to 4 as long as the power push rod 26 is fixedly connected with the first piston member 14, at this time, the first piston member 14 cannot slide under the condition that the power push rod 26 does not stretch or retract. Similarly, the second foam liquid tank 17 and the second piston member 20 can also be changed to fixed connection, so that the position of the second piston member 20 cannot slide; when it is fixed connection, see Figures 1 to 4As long as the power stack rod 26 is fixedly connected with the second piston piece 20, the second piston piece 20 cannot slide when the power push rod 26 does not stretch out or retract. Therefore, the abutment or fixed connection between the two power push rods 26 and the first piston piece 14 and the second piston piece 20 determines whether the first piston piece 14 and the second piston piece 20 are in sliding connection with the first foam liquid tank 11 and the second foam liquid tank 17. Of course, when the first piston piece 14 and the second piston piece 20 cannot slide, the gas outlet 16 needs to be opened at this time; when the first piston piece 14 and the second piston piece 20 can slide, the gas outlet 16 and the liquid inlet 15 need to be kept in a sealed state.

[0093] The water film forming foam fire extinguishing system of the application, through the annular slide rail 3 arranged on the first main plate 2, makes the second main plate 4 be able to rotate with the annular slide rail 3 as a guide rail by means of the sliding block 5 and the limiting pulley 6; thereby directly and synchronously driving the first foam liquid tank 11 and the second foam liquid tank 17 fixedly installed on the second main plate 4, the first foam liquid tank 11 and the second foam liquid tank 17 can be rotated under the driving of the second main plate 4, the positions of the first foam liquid tank 11 and the second foam liquid tank 17 are exchanged, the first foam liquid tank 11 is in the upper position or the second foam liquid tank 17 is in the upper position; finally the water film forming foam liquid in the foam liquid tank in the upper position can flow into the foam liquid tank in the lower position. In the actual use process, the first foam liquid tank 11 and the second foam liquid tank 17 can be filled with water film forming foam liquid at the same time, at this time, when the upper and lower positions of the first foam liquid tank 11 and the second foam liquid tank 17 are exchanged by rotating 180 degrees (the rotation is driven by the first pulley 7, the second pulley 9, the transmission belt 10 and the cooperation of the second main plate 4 along the annular slide rail 3), the internal precipitate flows, the precipitate is dispersed, and the internal water film forming foam liquid is more uniform. In addition, in the actual use process, only one of the first foam liquid tank 11 and the second foam liquid tank 17 has water film forming foam liquid, and the other is a hollow structure, at this time, when the upper and lower positions of the first foam liquid tank 11 and the second foam liquid tank 17 are exchanged by rotating 180 degrees, the water film forming foam liquid in the foam liquid tank in the upper position can flow into the foam liquid tank in the lower position like an hourglass, so as to further make the internal water film forming foam liquid concentration more uniform, solve the problem of stratification and precipitation of the water film forming foam liquid placed for a long time at present. In addition, rotating the first foam liquid tank 11 and the second foam liquid tank 17 to make the internal liquid uniform also solves the contradictory problem that in order to avoid the precipitate, regular stirring is required, and too much shaking will affect the concentration and performance of the foam liquid.

[0094] The water film forming foam fire extinguishing system has the advantages that the first piston member 14 is slidably connected in the first foam liquid tank 11 and the second piston member 20 is slidably connected in the second foam liquid tank 17, so that when the water film forming foam liquid in the first foam liquid tank 11 and the second foam liquid tank 17 is sucked away, the first piston member 14 and the second piston member 20 can slide inwardly under negative pressure along with the change of the liquid level, and the first foam liquid tank 11 and the second foam liquid tank 17 have no excessive hollow area, so that when the remaining foam liquid is not much, the foam liquid cannot be shaken, and the problem that the foam liquid in the foam liquid tank is shaken and intermittently separated from the liquid outlet during the movement of the mobile foam fire extinguishing system, so that the foam liquid cannot be intermittently sucked is solved.

[0095] Further, referring to Figure 1 , the servo motor 8 is connected with a reduction box 25, and the second pulley 9 is installed on a power output shaft of the reduction box 25.

[0096] Further, referring to Figures 1 to 4 , the first piston member 14 and the second piston member 20 respectively have at least one power push rod 26, referring to Figure 2 , Figure 3 , Figure 4 , and Figure 7 , the end of the telescopic rod of the power push rod 26 at the upper side abuts against the surface of the first piston member 14; referring to Figure 2 , Figure 3 , Figure 4 , and Figure 9 , the end of the telescopic rod of the power push rod 26 at the lower side abuts against the surface of the second piston member 20;

[0097] The two power push rods 26 are fixedly connected with the second main plate 4;

[0098] The power push rod 26 can assist in pushing the first piston member 14 and the second piston member 20 by being added to the first piston member 14 and the second piston member 20 respectively. Figures 1 to 4 As shown in , the power push rod 26 has the same sliding direction as the first piston member 14 and the second piston member 20; and the pushing speed of the two power push rods 26 is equal to or close to the moving speed of the first piston member 14 and the second piston member 20, so that the power push rod 26 can assist in pushing the first piston member 14 and the second piston member 20.

[0099] As shown in Figures 1 to 4 , the power push rod 26 has the same sliding direction as the first piston member 14 and the second piston member 20; and the pushing speed of the two power push rods 26 is equal to or close to the moving speed of the first piston member 14 and the second piston member 20, so that the power push rod 26 can assist in pushing the first piston member 14 and the second piston member 20.

[0100] Further, a partition 28 is included, referring to Figure 4 ,Figure 5 and Figure 8 The partition 28 is in the shape of "x" in cross section, and has a vertical hole in the middle, which penetrates the upper and lower ends; as shown, the partition 28 is at least partially in the first foam liquid tank 11 and the second foam liquid tank 17, respectively; Figure 8

[0101] As shown, the partition 28 forms a flow guide groove 29 with the inner walls of the first foam liquid tank 11 and the second foam liquid tank 17; so that the fluid can flow along the wall, reducing the foam caused by liquid impact; Figure 8

[0102] As shown, the partition 28 has a flow guide hole 30 in the center; Figure 8

[0103] By further providing the partition 28, the first foam liquid tank 14 and the second foam liquid tank 17 have two flow passages between them, one is the flow guide hole 30, and the other is the flow guide groove 29, so that when the first foam liquid tank 14 and the second foam liquid tank 17 are rotated by 180 degrees with the second main plate 4, and when one of the first foam liquid tank 14 and the second foam liquid tank 17 has liquid and the other is hollow without liquid, the flow guide hole 30 and the flow guide groove 29 two flow passages can better facilitate the flow of different fluids.

[0104] As shown, Figure 1 , Figure 2 and Figure 4 It includes a transfer tank 31, one end of which is connected to the liquid outlet 21 of the second foam liquid tank 17, and the other end is connected to the liquid inlet of the proportional mixer 22; that is, as a further refinement of the foregoing, there is also a transfer tank 31 between the liquid outlet 21 and the proportional mixer 22, so that the water film foam liquid in the second foam liquid tank 17 first enters the transfer tank 31 and then enters the proportional mixer 22; of course, as common knowledge, the proportional mixer 22 needs to be connected to an external water source when in use, which is not described here;

[0105] It also includes a spring 32, one end of which is fixedly connected to the transfer tank 31, and the other end is fixedly connected to the base 1;

[0106] ​​​The further provided transfer tank 31 can provide a certain time supply of foam liquid in the tank when the first foam liquid tank 14 and the second foam liquid tank 17 need to be extinguished in the process of rotation; and since the transfer tank 31 is provided on the spring 32, when used on a high-speed tunnel or a fire truck, it can absorb the vibration of a large truck on a highway or the shaking of a fire truck during driving, so that the whole transfer tank 31 shakes, thereby solving the problem of foam liquid precipitation and stratification in the transfer tank 31.

[0107] Further, referring to Figures 1 to 4 , and Figure 7 , Figure 9 , Figure 11 and Figure 13 , the first piston 14 and the second piston 20 are respectively provided with a fixedly connected liquid level slide rod 33, as shown in Figure 11 and Figure 13 , the side of the liquid level slide rod 33 is provided with a pressing table 34; referring to Figure 11 , the side of the pressing table 34 is provided with an inclined surface;

[0108] The switch sleeve 35 is fixedly connected with the second main plate 4, as shown in Figure 7 , Figure 9 and Figure 11 , the switch sleeve 35 is provided with at least three trigger switches 36 at different heights;

[0109] Referring to Figure 11 , the liquid level slide rod 33 is slidingly installed in the switch sleeve 35; when the pressing table 34 is at the same horizontal position as the trigger switch 36, the pressing table 34 abuts against the trigger switch 36 and pushes the trigger switch 36; that is, when the liquid level slide rod 33 moves up and down with the first piston 14 and / or the second piston 20, the pressing table 34 overlaps the trigger switch 36, the pressing table 34 will press the trigger switch 36, and the trigger switch 36 is pressed;

[0110] The present application is characterized in that the fixedly connected liquid level slide rod 33 is arranged on the first piston 14 and the second piston 20 respectively, and the pressing table 34 is arranged on the liquid level slide rod 33, and the switch sleeve 35 is fixedly connected to the second main plate 4, so that the liquid level slide rod 33 can slide up and down along with the first piston 14 and the second piston 20, when sliding to different positions, the pressing table 34 will press the trigger switch 36 on the surface of the switch sleeve 35 at different heights, at this time, at least three trigger switches 36 can be electrically connected to the external sound playing device and / or alarm lamp, when pressing different trigger switches 36, different sound playing devices and / or alarm lamps are opened, thereby providing the liquid level height prompt to the staff; and since the first piston 14 and the second piston 20 are in sliding connection with the first foam liquid tank 11 and the second foam liquid tank 17, the first piston 14 and the second piston 20 can slide inwards along with the change of the liquid level under negative pressure, at this time, the measurement accuracy of the liquid level is greatly improved, and the problem that the foam liquid tank and the foam liquid are in a shaking state and cannot accurately detect the liquid level in the tank in the case that the fire truck or other mobile fire extinguishing system is moving and extinguishing fire at the same time is solved.

[0111] Further, the water film forming foam fire extinguishing system of the present application can increase wheels at the bottom of the base 1, or install the system on a fire truck, which can be used as a mobile system; therefore, the water film forming foam fire extinguishing system of the present application can be used as a fixed foam fire extinguishing system, a semi-fixed foam fire extinguishing system or a mobile foam fire extinguishing system, when applied to a fixed foam fire extinguishing system in a high-speed tunnel or other places, since the frequency of fire occurrence is not high, only one of the first foam liquid tank 11 and the second foam liquid tank 17 can be filled with water film forming foam liquid, so as to reduce the cost of consumables. For a mobile foam fire extinguishing system, such as a fire truck, the frequency of use is high, so the first foam liquid tank 11 and the second foam liquid tank 17 are respectively filled with water film forming foam liquid. Example 2

[0112] The water film forming foam liquid anti-settling / delamination method of the present application is realized by using the water film forming foam fire extinguishing system of Example 1, so it includes all the technical solutions of Example 1, and the same parts as Example 1 will not be described again, only the specific method scheme is described here.

[0113] Specifically, the water film forming foam liquid anti-settling / delamination method of the present application includes the following steps:

[0114] (1). The water film forming foam fire extinguishing system of Example 1 is used; wherein, as shown in the accompanying drawings, the second foam liquid tank 17 is vertically below the first foam liquid tank 11; Figure 2

[0115] ​(2). The first piston piece 14 in the water film forming foam fire extinguishing system is in fixed or sliding connection with the first foam liquid tank 11; the second piston piece 20 in the water film forming foam fire extinguishing system is in fixed or sliding connection with the second foam liquid tank 17;

[0116] (3). Obtain the start-up use information of the water film forming foam fire extinguishing system, and take each shutdown time of the water film forming foam fire extinguishing system as a new timing start time;

[0117] (4). Start from the timing start time, when the predetermined time is reached, under the driving of the servo motor 8 in the water film forming foam fire extinguishing system, through the use of the first pulley 7, the second pulley 9 and the transmission belt 10, the second main plate 4 is driven to rotate 180 degrees with the annular slide rail 3 as a guide rail and stay for a predetermined flow time, so that the second foam liquid tank 17 in the water film forming foam fire extinguishing system is vertically above the first foam liquid tank 11, and the fluid and sediment in the first foam liquid tank 11 and the second foam liquid tank 17 are circulated for the first time;

[0118] (5). When the predetermined flow time is reached, rotate to reset, so that the second foam liquid tank 17 is vertically below the first foam liquid tank 11 for the second time of circulation;

[0119] (6). When the water film forming foam fire extinguishing system continues to be used without starting again, take the second time of circulation of the last time as a new timing start time; repeat the above steps (4) and (5);

[0120] Or:

[0121] When the water film forming foam fire extinguishing system is started again, the above steps (3), (4) and (5) are executed.

[0122] The water film forming foam liquid anti-settling / delamination method solves the problems of delamination and sedimentation of the water film forming foam liquid after long storage, solves the problem that the foam liquid in the foam liquid tank of the mobile foam fire extinguishing system shakes and intermittently separates from the liquid outlet during movement, causing intermittent failure to extract foam liquid, and solves the contradictory problem that in order to avoid sediment, regular stirring is required, and excessive shaking will affect the concentration and performance of the foam liquid.

[0123] Further, the above step (2) in the preceding text mentioned: "the first piston piece 14 in the water film forming foam fire extinguishing system is in fixed or sliding connection with the first foam liquid tank 11; the second piston piece 20 in the water film forming foam fire extinguishing system is in fixed or sliding connection with the second foam liquid tank 17;" wherein the first piston piece 14 and the second piston piece 20 are fixedly connected or slidingly connected, either of the two connection modes can be selected; mainly according to the needs to select, if it is necessary to rotate the first foam liquid tank 11 and the second foam liquid tank 17 by 180 degrees to realize the internal fluid like a sandglass like mutual rotation, the first piston piece 14 and the second piston piece 20 are fixed, and one of the first foam liquid tank 11 and the second foam liquid tank 17 has water film forming foam liquid, and the other one is hollow structure and has no water film forming foam liquid; if it is necessary to rotate the first piston piece 14 and the second piston piece 20, the internal fluid fluctuation will not be too large, the first piston piece 14 and the second piston piece 20 are kept in sliding connection; so that there is no excess air in the inside.

[0124] Further, the continuation of step (3) in paragraph 2 of the embodiment, when the secondary use is not reached within the predetermined time, the previous timing is invalid, and the last shutdown time of the water film forming foam fire extinguishing system is taken as the new timing start time.

[0125] At the same time, further, for the fire truck or the application occasion with high use frequency, the average use time is calculated by analyzing the daily use frequency, if the average use time is the same as or similar to the predetermined time, the servo motor 8 is not started, and the impact force of the new water film forming foam liquid added after use is used to stir the fire truck on the road, so as to reduce the stirring frequency and save the cost. Embodiment 3

[0126] The liquid level detection method of the water film forming foam liquid in the embodiment 3 is realized by using the water film forming foam fire extinguishing system in the embodiment 1, so it includes all the technical solutions of the embodiment 1, and the same parts as the embodiment 1 will not be repeated here, only the specific method scheme is described.

[0127] Specifically, the liquid level detection method of the water film forming foam liquid includes the following steps:

[0128] (1). using the water film forming foam fire extinguishing system in claims 1 to X;

[0129] (2). sealing the liquid inlet 15 and the gas outlet 16 in the water film forming foam fire extinguishing system, and setting a one-way valve at the liquid outlet 21;

[0130] (3). Through the liquid outlet 21, the water film forming foam liquid in the first foam liquid tank 11 and the second foam liquid tank 17 in the water film forming foam fire extinguishing system is extracted, the negative pressure of the extracted water film forming foam liquid is used to make the first piston piece 14 and / or the second piston piece 20 slide with the liquid level change, so as to drive the liquid level sliding rod 33 in the water film forming foam fire extinguishing system to move up and down; the first piston piece 14 and the second piston piece 20 are connected in sliding mode, the hollow area in the first foam tank and the second foam tank is reduced, and the shaking of the water film forming foam liquid in the first foam tank and the second foam tank is reduced.

[0131] (4). The trigger switch 36 in the water film forming foam fire extinguishing system is connected with an external sound playing device and / or an alarm lamp; and a wireless communication component can be further added.

[0132] (5). When the pressing table 34 of the liquid level sliding rod 33 in the water film forming foam fire extinguishing system abuts against the trigger switch 36, the power supply is turned on, the external sound playing device and / or the alarm lamp are started, and the alarm information is sent.

[0133] Further, the following steps are included:

[0134] (1). The volume information of the water film forming foam liquid that has flowed out of the liquid outlet 21 in the water film forming foam fire extinguishing system is acquired;

[0135] (2). The residual amount information of the water film forming foam liquid in the first foam liquid tank 11 and the second foam liquid tank 17 is acquired according to the position information of the first piston piece 14 and the second piston piece 20 in the water film forming foam fire extinguishing system;

[0136] Or:

[0137] The residual amount information of the water film forming foam liquid in the first foam liquid tank 11 and the second foam liquid tank 17 is acquired according to the alarm information of the trigger switch 36 in the water film forming foam fire extinguishing system;

[0138] (3). The residual amount information in step (2) is compared and reviewed by using the volume information in step (1).

[0139] The liquid level detection method of the water film forming foam liquid solves the problem that the foam liquid tank and the foam liquid are in a shaking state and cannot be accurately detected in the case that the fire truck or other mobile fire extinguishing system is moved and used at the same time.

[0140] Those skilled in the art will appreciate that embodiments of the present application can be readily used as a method, a system or a computer program product. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer readable storage media (including, but not limited to, disk memory, CD-ROMs, optical storage devices, etc.) embodying computer readable program code.

[0141] The present application is described in reference to the flow diagrams and / or block diagrams of the methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flow diagrams and / or block diagrams, and combinations of blocks in the flow diagrams and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processing device or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flow diagrams and / or block diagrams block or blocks. Figure 1 one or more functions specified in the flow diagram and / or block diagram block or blocks and / or in the method of the embodiments of the application. Figure 1 one or more functions specified in the flow diagram and / or block diagram block or blocks and / or in the method of the embodiments of the application.

[0142] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the flow diagram and / or block diagram block or blocks. Figure 1 one or more functions specified in the flow diagram and / or block diagram block or blocks and / or in the method of the embodiments of the application. Figure 1 one or more functions specified in the flow diagram and / or block diagram block or blocks and / or in the method of the embodiments of the application.

[0143] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flow diagram and / or block diagram block or blocks. Figure 1 one or more functions specified in the flow diagram and / or block diagram block or blocks and / or in the method of the embodiments of the application. Figure 1 one or more functions specified in the flow diagram and / or block diagram block or blocks and / or in the method of the embodiments of the application.

[0144] The use of "first", "second", and "third" and similar terms in the description and claims is not used to denote any ordinal, quantity, or importance, but merely to distinguish one element from another. Also, the use of "one", "an", or "the" and similar terms is not used to limit the quantity of elements to one, but rather to denote at least one. The use of "including", "containing", and similar terms is meant to encompass the elements listed thereafter and not preclude other elements. The use of "above", "below", "left", "right", and similar terms is meant to indicate relative positions for purposes of illustration only, and that these relative positions can change as the absolute positions of the described objects change.

[0145] The above description of preferred embodiments of the application is not meant to limit the application, but merely to provide examples of the application. Other embodiments can be apparent to those of ordinary skill in the art from the drawings and the appended claims, and any changes or modifications that come within the spirit of the application are intended to be included.

Claims

1. A water-film forming foam extinguishing system, characterized in that The utility model relates to a kind of foam proportioning device, including: Base, the base has fixedly connected first mainboard, the first mainboard is at vertical angle; The surface of the first mainboard has fixedly connected annular slide rail; Second mainboard, the second mainboard is at parallel angle with the first mainboard;The back of the second mainboard has fixedly connected slider, the slider is provided with movably connected limiting pulley, the annular slide rail is at least partially between the slider and the limiting pulley;The second mainboard has fixedly connected first pulley, and the first pulley surrounds the edge of the second mainboard; Servo motor, the servo motor is fixedly installed on the base;The power output shaft of the servo motor drives second pulley, and the second pulley is connected by transmission belt between the first pulley. First foam liquid tank, the first foam liquid tank is fixedly installed on the surface of the second mainboard;One end of the first foam liquid tank has first liquid inlet, and the other end has first liquid outlet; First piston piece, the first piston piece is slidably installed in the first liquid inlet, and the first piston piece is liquid-tightly sealed between the inner wall of the first foam liquid tank;The first piston piece has liquid inlet and gas outlet; Second foam liquid tank, the second foam liquid tank is fixedly installed on the surface of the second mainboard;The second foam liquid tank is at vertical same axis with the first foam liquid tank;The second foam liquid tank is adjacent to the one end of the first foam liquid tank and has second liquid inlet, and the second liquid inlet is communicated with the first liquid outlet;The second foam liquid tank is away from the one end of the first foam liquid tank and has second liquid outlet; Second piston piece, the second piston piece is slidably installed in the second liquid outlet, and the second piston piece is liquid-tightly sealed between the inner wall of the first foam liquid tank;The second piston piece has liquid outlet; Proportional mixer, the proportional mixer is fixedly installed on the base;One end of the proportional mixer is communicated with the liquid outlet; Foam generating device, the other end of the proportional mixer is communicated with the foam generating device;The foam generating device is connected with spray gun; The outer part of the first piston piece and the second piston piece is respectively provided with at least one power push rod, and the telescopic rod end of the power push rod abuts against the surface of the first piston piece and / or the second piston piece; The power push rod is fixedly connected with the second mainboard; The first piston piece and the second piston piece are respectively provided with fixedly connected liquid level slide rod, and the side surface of the liquid level slide rod is provided with pressing table; It includes switch sleeve fixedly connected with the second mainboard, and at least three trigger switches at different heights are arranged in the switch sleeve; The liquid level slide rod is slidably installed in the switch sleeve;When the pressing table is at the same horizontal position with the trigger switch, the pressing table abuts against the trigger switch and pushes the trigger switch.

2. The water-film forming foam extinguishing system according to claim 1, characterized in that The servo motor is connected with reduction box, and the second pulley is installed on the power output shaft of the reduction box.

3. The water-film forming foam extinguishing system according to claim 1, characterized in that It includes shell, the shell is fixedly connected with the base, and surrounds the first mainboard.

4. The water-film forming foam extinguishing system according to claim 1, characterized in that It includes partition, and the cross section of the partition is "x" type;The partition is at least partially arranged in the first foam liquid tank and the second foam liquid tank respectively. The partition forms a flow guide groove between the inner wall of the first foam liquid tank and the inner wall of the second foam liquid tank. The center of the partition has a flow guide hole.

5. The water-film forming foam extinguishing system according to claim 1, characterized in that The water film forming foam fire extinguishing system comprises a transfer tank which is communicated with the liquid outlet of the second foam liquid tank at one end and with the liquid inlet of the proportional mixer at the other end. The water film forming foam fire extinguishing system comprises a spring which is fixedly connected with the transfer tank at one end and with the base at the other end.

6. A method for preventing settling / delamination of water-based film-forming foam, characterized by, The steps comprise: (1). The water film forming foam fire extinguishing system of claims 1 to 5 is used; wherein the second foam liquid tank is vertically below the first foam liquid tank; (2). The first piston in the water film forming foam fire extinguishing system is in fixed or sliding connection with the first foam liquid tank; the second piston in the water film forming foam fire extinguishing system is in fixed or sliding connection with the second foam liquid tank; (3). The start-up use information of the water film forming foam fire extinguishing system is obtained, and the time of each shutdown of the water film forming foam fire extinguishing system is taken as a new timing start time; (4). Starting from the timing start time, when the predetermined time is reached, under the driving of the servo motor in the water film forming foam fire extinguishing system, through the use of the first pulley, the second pulley and the transmission belt, the second mainboard is rotated 180 degrees with the annular slide rail as the guide rail and stays for a predetermined flow time, so that the second foam liquid tank in the water film forming foam fire extinguishing system is vertically above the first foam liquid tank, and the fluids and precipitates in the first foam liquid tank and the second foam liquid tank are circulated for the first time; (5). After the predetermined flow time is reached, the rotation is reset, and the second foam liquid tank is repositioned vertically below the first foam liquid tank for the second circulation; (6). When the water film forming foam fire extinguishing system continues to be used without starting up again, the second circulation of the last time is taken as a new timing start time; the steps (4) and (5) are repeatedly executed; Or: When the water film forming foam fire extinguishing system is started up again, the steps (3), (4) and (5) are executed.

7. A method of detecting the liquid level of an aqueous film-forming foam solution, characterized by The steps comprise: (1). The water film forming foam fire extinguishing system of claims 1 to 5 is used; (2). The liquid inlet and the gas outlet of the water film forming foam fire extinguishing system are sealed, and a one-way valve is arranged at the liquid outlet; (3). The water film forming foam liquid in the first foam liquid tank and the second foam liquid tank of the water film forming foam fire extinguishing system is extracted through the liquid outlet, and the negative pressure of the extracted water film forming foam liquid makes the first piston and / or the second piston slide with the change of the liquid level, so as to drive the liquid level slide rod in the water film forming foam fire extinguishing system to move up and down; the first piston and the second piston in sliding connection reduce the hollow area in the first foam tank and the second foam tank, thereby reducing the shaking of the water film forming foam liquid in the first foam tank and the second foam tank; (4). The trigger switch in the water film forming foam fire extinguishing system is connected with an external sound playing device and / or an alarm lamp; (5). When the pressing table of the liquid level slide rod abuts against the trigger switch, the power supply is turned on, the external sound playing device and / or the alarm lamp are started, and alarm information is issued.

8. The liquid level detection method of the water-based film-forming foam solution according to claim 7, characterized by, The steps comprise: (1). Obtain the volume information of the water film forming foam liquid that has flowed out of the outlet of the water film forming foam fire extinguishing system; (2). Obtain the remaining amount information of the water film forming foam liquid in the first foam liquid tank and the second foam liquid tank according to the position information of the first piston and the second piston in the water film forming foam fire extinguishing system; Or: Obtain the remaining amount information of the water film forming foam liquid in the first foam liquid tank and the second foam liquid tank according to the alarm information of the trigger switch in the water film forming foam fire extinguishing system; (3). Compare and review the remaining amount information in step (2) by using the volume information in step (1).

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