A device for detecting the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent.

Abstract

This invention discloses a device for detecting the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent, comprising a foaming tank and a metering component. The metering component is vertically and slidably disposed inside the foaming tank. A weighing platform is disposed below the foaming tank, and a storage tank is disposed outside the foaming tank. A foam gun is connected to the storage tank near the foaming tank. The beneficial effects are: by setting a float plate inside the foaming tank as a metering component for detecting the foam expansion volume, this invention can determine the corresponding foam volume generated while outputting any amount of foam mixture. Furthermore, it can directly obtain the foam expansion ratio by dividing the generated foam volume by the consumed foam mixture volume, thus improving the problem of existing methods that cannot accurately measure the total foam production and require indirect calculation of the volumetric foam expansion ratio by weight, resulting in large errors. This invention offers more complete functionality and improved detection accuracy.

Description

Technical Field

[0001] This invention relates to the field of foam fire extinguishing agent testing equipment, specifically to a device for testing the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent. Background Technology

[0002] Premixed aqueous film-forming foam (AFCF) is a widely used fire extinguishing agent. Its foaming principle involves mixing it with water using a pressure-type foam proportioning device. The output foam mixture is stored in a storage tank. When fire extinguishing is needed, the foam mixture is supplied to a foam generator to produce foam for fire suppression. The foaming ratio of an AFCF refers to the ratio of the volume of the foam produced by the extinguishing agent to the volume of its foaming agent aqueous solution. The foaming ratio is one of the important indicators related to the performance of the extinguishing agent. Current methods for testing the foaming ratio of AFCF are calculated by combining the foam weight with a known density coefficient. The specific operation process is as follows: 1. Foam is sprayed into an empty container (known volume V and weight W1) using a foam gun; 2. After the empty container is full, the foam overflowing from the opening is scraped off with a scraper, and the total weight W2 is obtained; 3. The total weight from step 2 is subtracted from the weight of the empty container to obtain the foam weight W3. The foaming ratio N is then obtained by multiplying the volume V by the density ρ of the foam mixture and dividing by the foam weight W3. Because this method cannot accurately read the total foam volume after the foam is sprayed out, it can only scrape off the amount of foam exceeding the empty bucket after the bucket is filled, and indirectly obtain the remaining foam amount from the empty bucket volume. Although the dosage of the foam mixture consumed can be accurately measured, the total amount of foam sprayed out cannot be measured. That is, the foaming ratio can only be calculated by weight and density. Therefore, it is not possible to directly divide the total amount of foam formed by the volume of foam mixture consumed. Therefore, there is an urgent need to design a detection device that can accurately measure the total amount of foam produced and directly obtain the foaming ratio by volume calculation. Summary of the Invention

[0003] The purpose of this invention is to provide a foaming ratio detection device for premixed aqueous film-forming foam fire extinguishing agents to solve the above-mentioned problems. By setting a float plate inside the foaming tank as a metering component to detect the foaming volume, the device can determine the corresponding amount of foam generated while outputting any amount of foam mixture. Furthermore, the foaming coefficient can be directly obtained by dividing the generated foam volume by the consumed foam mixture volume. This improves upon the problem of existing devices that cannot accurately measure the total amount of foam generated and require indirect calculation of the volume foaming coefficient by weight, resulting in large errors. The device has more complete functions and improved detection accuracy, as detailed below.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This invention provides a device for detecting the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent, comprising a foaming tank and a metering component. The metering component is slidably and vertically disposed inside the foaming tank. A weighing platform is disposed below the foaming tank, and a storage tank is disposed outside the foaming tank. A foam gun is connected to the side of the storage tank near the foaming tank, and a connector is disposed on the outer side of the bottom of the foaming tank. A connecting sleeve connected to the foam gun is detachably connected to the outer side of the connector. A tank cover is disposed at the top opening of the storage tank, and a height gauge is disposed between the tank cover and the foaming tank.

[0006] The above-mentioned device for detecting the expansion ratio of a premixed aqueous film-forming foam extinguishing agent involves the following steps: The foam extinguishing agent to be tested is introduced into the storage tank, and the tank cap is installed at the top opening of the tank. The storage tank is then moved, causing the foam gun and connecting sleeve to move laterally towards the connector. The movable sleeve on the outer side of the outer cylinder is then pushed towards the foam gun, compressing the spring and moving the end slot laterally to the corresponding locking ball position. This ensures the locking ball can move outward into the end slot. The connecting sleeve is then moved to clamp onto the outside of the connector, at which point the convex ring abuts against the inner protrusion of the outer cylinder, and the locking groove moves to the corresponding receiving slot position. The movable sleeve is then released, and the spring pushes it to the inner wall, pressing it against the locking ball position. The locking ball is then pressed inward into the locking groove, locking the groove and receiving slot together, thus completing the rapid installation of the connecting sleeve on the outside of the connector. Connect the bellows; then open the valve on the bellows to open the foam delivery channel. Then rotate the turntable to drive the screw to rotate, and use the screw to drive the support arm to move the pressure plate down. Then use the pressure plate to input the foam extinguishing agent downward into the bellows. After the foam extinguishing agent passes through the foam gun, it generates foam and enters the bottom of the foam tank along the connector. The foam pushes the float in the foam tank to move up. The balance block and the pull rope are used to balance the float and ensure that the float floats up under the support of the foam. The rise of the float is used as a display component for the foam generation height. At the same time, the downward movement of the balance block on the height gauge represents the rising height of the float, that is, the foam generation height. The downward movement of the auxiliary block at the top of the support arm represents the consumption height of the foam extinguishing agent. By corresponding the heights of the two, the total volume of foam generated and the volume of extinguishing agent consumed can be obtained, so as to directly obtain the volume expansion ratio.

[0007] Preferably, the metering component includes a float plate that is vertically sealed to the inner wall of the foaming tank. A pull rope that extends vertically out of the top opening of the foaming tank is fixed to the top of the float plate. An inner guide wheel that supports the pull rope is provided in the middle of the top opening of the foaming tank, and an outer guide wheel that guides the outer end of the pull rope to extend downward is provided on the outside of the foaming tank.

[0008] Preferably, the inner guide wheel is coaxially provided with a rotating shaft that is longitudinally fixed to the inner wall of the foaming tank and supports the rotation of the inner guide wheel. The outer guide wheel is provided with a rotating frame fixed to the outer wall of the foaming tank. The outer end of the pull rope is fixed with a balance block that pulls the pull rope downward, and the balance block has the same weight as the float.

[0009] Preferably, a guide ear is fixed to the inner wall of the foaming tank on the side away from the balance block, and an operating rod that runs vertically through the guide ear is fixed to the top of the float plate, with the operating rod and the guide ear having a clearance fit. A handle is fixed to the top of the operating rod.

[0010] Preferably, the height gauge has a scale value on its front side with the top of the height gauge as the starting point of the vertical height. The outer side of the balance block has a vertically penetrating groove that can be snapped onto the outer side of the height gauge and slide vertically with the height gauge. The bottom of the height gauge is fixed with a mounting plate that extends laterally to the outer wall of the foaming tank and is fixedly connected to the side wall of the foaming tank.

[0011] Preferably, the bottom of the storage tank is flush with the bottom of the foaming tank, and the bottom of the storage tank is provided with a support for supporting the storage tank.

[0012] Preferably, the end of the foam gun away from the foaming tank is connected to a corrugated pipe with a flexible hose structure. The corrugated pipe extends to the outside of the bottom of the storage tank and is connected to the storage tank. A switch valve is provided on the corrugated pipe.

[0013] Preferably, the connector is a cylindrical structure fixed below the float plate at the bottom of the foaming tank. The connector has a groove with an isosceles trapezoidal cross-section coaxially arranged on its outer circumference. The connector has a chamfered insertion port on the outer side near the connecting sleeve. The connector has a protruding ring on its outer circumference near the connecting sleeve. The connecting sleeve includes an outer cylinder that connects to the foam gun outlet through a flange. The outer cylinder has a guide groove coaxially arranged on its outer side. A movable sleeve extending to the outside of the groove is fitted on the outer side of the guide groove.

[0014] Preferably, the outer cylinder is provided with multiple sets of receiving grooves with locking balls embedded inside, corresponding to the slot. The inner ports of the receiving grooves converge inward to prevent the locking balls from coming out of the receiving grooves. The inner side of the locking balls is engaged with the slot. The inner side of the outer end of the movable sleeve is provided with an end groove to accommodate the locking balls coming out of the slot. The other end of the movable sleeve is fixed with a guide ring that extends into the guide groove and is in clearance fit with the guide groove. A spring that pushes the guide ring is sleeved inside the guide groove to press against the protruding ring. The outer circumference of the movable sleeve is provided with an anti-slip groove.

[0015] Preferably, an inverted U-shaped mounting bracket is fixed to the side of the can lid near the height gauge. A constraint groove runs vertically through the can lid on the bottom side of the mounting bracket. A support arm slides vertically inside the constraint groove. A pressure plate that slides vertically and seals against the inner wall of the storage tank is fixed to the bottom end of the support arm. A bearing seat is provided in the middle of the mounting bracket, and a screw inserted into the support arm is vertically rotatably fitted in the middle of the bearing seat. The screw is threaded into the support arm. A turntable is fixed to the top of the screw. An auxiliary block with its top side flush with the top side of the height gauge is fixed to the top of the support arm.

[0016] The beneficial effects are as follows: This invention sets a float plate inside the foaming tank as a measuring component to detect the foam volume, and sets a balance block to connect the float plate with a pull rope, thereby ensuring that the float plate can be pushed up to display the foam volume during the foam formation process in the foaming tank. Thus, it can obtain the corresponding amount of foam generated while outputting any amount of foam mixture. Furthermore, it can directly obtain the foaming coefficient by dividing the generated foam volume by the consumed foam mixture volume, thus improving the problem of large errors in existing methods that cannot accurately measure the total amount of foam generated and require indirect calculation of the volume foaming coefficient by weight.

[0017] In addition, a weighing platform is set at the bottom of the foaming tank, and a quick-release pipe joint is set to connect the foam gun and the foaming tank so as to realize the function of weighing the foam weight. This retains the structure of indirectly calculating the foaming coefficient by weighing the foam and combining it with the density of the foam mixture, making the function more complete.

[0018] Furthermore, the balance block, which serves as the foam volume indicator, and the auxiliary block, which serves as the mixed liquid volume indicator, are placed side by side on both sides of the height gauge. This allows for a direct reading of the foam generation volume and the volume of foam mixed liquid consumed. It also facilitates the dynamic reading of the multiples of the data on both sides during the foam generation process. In other words, the foaming multiple can be recorded transiently during the foam generation process, avoiding the impact of foam breakage when reading after foaming is completed, thus improving the detection accuracy. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a front view structural diagram of the present invention;

[0021] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 3 This is a structural breakdown diagram of the present invention;

[0023] Figure 4 This is a structural breakdown diagram of the foaming tank and metering component of the present invention;

[0024] Figure 5 This is a structural disassembly diagram of the can lid of the present invention;

[0025] Figure 6 This is a front sectional view of the connecting sleeve of the present invention;

[0026] Figure 7 This is a structurally disassembled schematic diagram of the connecting sleeve of the present invention;

[0027] Figure 8 This is a three-dimensional structural schematic diagram of another aspect of the present invention.

[0028] The annotations in the attached figures are explained as follows:

[0029] 1. Foaming tank; 101. Inner guide wheel; 101a. Rotating shaft; 102. Outer guide wheel; 102a. Rotating frame; 103. Guide ear; 2. Metering component; 201. Float; 202. Pull rope; 203. Balance block; 204. Slide chute; 205. Operating lever; 206. Handle; 3. Weighing platform; 4. Storage tank; 401. Support; 5. Foam gun; 501. Bellows; 6. Connecting sleeve; 601. Outer cylinder; 602. Guide groove; 603. Container 604. Groove; 605. Locking ball; 605. Movable sleeve; 605a. Anti-slip groove; 605b. Guide ring; 606. End groove; 7. Connector; 701. Slot; 702. Raised ring; 703. Plug-in port; 8. Can lid; 801. Mounting bracket; 802. Constraint groove; 803. Bearing seat; 804. Screw; 805. Turntable; 806. Pressure plate; 807. Support arm; 808. Auxiliary block; 9. Height gauge; 901. Scale value; 902. Mounting plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0031] See Figures 1-8As shown, the present invention provides a device for detecting the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent, including a foaming tank 1 and a metering component 2. The metering component 2 is slidably and vertically disposed inside the foaming tank 1. The foaming tank 1 serves as a container for foam generation. A weighing platform 3 is disposed below the foaming tank 1 to detect the total weight of the empty foaming tank 1 and the total weight of the generated fire extinguishing foam. A storage tank 4 is disposed on the outside of the foaming tank 1. A foam gun 5 for spraying the generated foam from the fire extinguishing agent is connected to the side of the storage tank 4 near the foaming tank 1. A connector 7 is disposed on the outer side of the bottom of the foaming tank 1. A connecting sleeve 6 for connecting the foam gun 5 is detachably connected to the outer side of the connector 7. A can lid 8 is detachably disposed at the top opening of the storage tank 4. Specifically, the can lid 8 can be connected to the top opening of the storage tank 4 by a latch or thread. A height gauge 9 is disposed between the can lid 8 and the foaming tank 1.

[0032] As an optional implementation, the metering component 2 includes a float 201 that vertically seals against the inner wall of the foaming tank 1. The float 201 is made of foam board, and a sealing ring that vertically slides and seals against the inner wall of the foaming tank 1 is provided on the outer circumference of the float 201. A pull rope 202 that extends vertically out of the top opening of the foaming tank 1 is fixed to the top of the float 201. An inner guide wheel 101 that supports the pull rope 202 is provided in the middle of the top opening of the foaming tank 1, and an outer guide wheel 102 that guides the outer end of the pull rope 202 to extend downward is provided on the outer side of the foaming tank 1. A rotating shaft 101a that is longitudinally fixed to the inner wall of the foaming tank 1 and supports the rotation of the inner guide wheel 101 is coaxially provided in the middle of the inner guide wheel 101. The outer guide wheel 102 is provided with a rotating frame 102a fixed to the outer wall of the foaming tank 1. The outer end of the pull rope 202 is fixed with a balance block 203 that pulls the pull rope 202 downward. Both ends of the pull rope 202 extend vertically, and the balance block 203 and the float 201 have the same weight. The balance block 203 is used to balance the float 201, so as to ensure that the float 201 can be pushed upward after foam is formed in the foaming tank 1. Then, the float 201 is used to form a foam storage space at the bottom of the foaming tank 1, ensuring that the foam can fill the bottom side of the float 201. The height of the float 201 represents the height of foam generation, so as to accurately determine the total amount of foam generated.

[0033] A guide ear 103 is fixed on the inner wall of the foaming tank 1 away from the balance block 203. An operating rod 205 is fixed on the top of the float 201, which runs vertically through the guide ear 103. The operating rod 205 is in clearance fit with the guide ear 103. A handle 206 is fixed on the top of the operating rod 205, which is convenient to directly grasp the handle 206 to control the float 201 to move up and down. When foam needs to be discharged, the float 201 is pressed down to squeeze the foam out from the connector 7. A scale value 901 with the top of the height gauge 9 as the starting point of the vertical height is provided on the front side. A groove 204 is vertically penetrating the outer side of the balance block 203, which can be engaged with the outer side of the height gauge 9 and slide vertically with the height gauge 9, so as to ensure that the balance block 203 can slide vertically on the outer side of the height gauge 9. A mounting plate 902 is fixed at the bottom of the height gauge 9, which extends laterally to the outer wall of the foaming tank 1 and is fixedly connected to the side wall of the foaming tank 1.

[0034] The bottom end of the storage tank 4 is flush with the bottom end of the foaming tank 1, and a support base 401 is provided at the bottom end of the storage tank 4 to support it. The end of the foam gun 5 away from the foaming tank 1 is connected to a corrugated pipe 501 with a flexible hose structure. The corrugated pipe 501 extends to the outside of the bottom end of the storage tank 4 and is connected to the storage tank 4. A switch valve is provided on the corrugated pipe 501 to control the opening and closing state of the foam extinguishing agent delivery channel. The connector 7 is a cylindrical structure fixed below the float plate 201 at the bottom end of the foaming tank 1. The outer circumference of the connector 7 is coaxially provided with a slot 701 with an isosceles trapezoidal cross section. The outer side of the connector 7 near the connecting sleeve 6 is provided with a chamfered insertion port 703. The outer circumference of the connector 7 near the connecting sleeve 6 is provided with a protruding ring 702. The connecting sleeve 6 includes an outer cylinder 601 that is connected to the outlet of the foam gun 5 through a flange. The outer side of the outer cylinder 601 is coaxially provided with a guide groove 602. A cylindrical movable sleeve 605 extending to the outside of the slot 701 is sleeved on the outside of the guide groove 602.

[0035] The outer cylinder 601 is provided with multiple sets of receiving grooves 603 around the corresponding slot 701, with locking balls 604 embedded inside. The inner ports of the receiving grooves 603 converge inward to prevent the locking balls 604 from coming out of the receiving grooves 603. The inner side of the locking balls 604 engages with the slot 701, and the connecting sleeve 6 and the connecting head 7 are locked by the locking balls 604. The inner side of the outer end of the movable sleeve 605 is provided with an end groove 606 for receiving the locking balls 604 to come out of the slot 701. The other end of the movable sleeve 605 is fixed with a guide ring 605b that extends into the guide groove 602 and is in clearance fit with the guide groove 602. A spring that pushes the guide ring 605b is fitted inside the guide groove 602 to press it against the protruding ring 702. The outer circumference of the movable sleeve 605 is provided with an anti-slip groove 605a.

[0036] A U-shaped mounting bracket 801 is fixed to the side of the can lid 8 near the height gauge 9. A constraint groove 802 is vertically inserted through the can lid 8 on the bottom side of the mounting bracket 801. A support arm 807 is vertically slidably fitted inside the constraint groove 802. A pressure plate 806 is vertically slidably sealed to the inner wall of the storage tank 4 at the bottom end of the support arm 807. A bearing seat 803 is provided in the middle of the mounting bracket 801, and a screw 804 inserted into the support arm 807 is vertically rotatably fitted in the middle of the bearing seat 803. The bearing seat 803 is rotatably fitted with the screw 804 through an internal bearing. In addition, the screw 804 is threadedly fitted with the support arm 807, so that by rotating the screw 804, the support arm 807 is driven to lift the pressure plate 806 by rotating the screw 804 in the middle of the bearing seat 803. The lowering mechanism facilitates the downward movement of the foam extinguishing agent in the storage tank 4 via the pressure plate 806, allowing it to be output into the bellows 501. A turntable 805 is fixed to the top of the screw 804 for easy rotation. An auxiliary block 808 is fixed to the top of the support arm 807, with its top side flush with the top side of the height gauge 9. The auxiliary block 808 serves as a positioning component indicating the downward movement distance of the support arm 807 and the pressure plate 806, facilitating the determination of the consumed volume of foam extinguishing agent in the storage tank 4 based on the downward movement distance of the pressure plate 806. On the other side, a balance block 203 displays the upward movement distance of the float 201, thereby obtaining the total volume of foam generated in the foaming tank 1 based on the upward movement distance of the float 201. This allows for a direct comparison between the total foam volume and the consumed volume of extinguishing agent, quickly determining the foaming ratio.

[0037] Using the above structure, during use, the foam extinguishing agent to be tested is introduced into the storage tank 4, and the tank cover 8 is installed at the top opening of the storage tank 4. The storage tank 4 is then moved, causing the foam gun 5 and connecting sleeve 6 to move laterally towards the connector 7. Then, the movable sleeve 605 on the outer side of the outer cylinder 601 is pushed towards the foam gun 5, thereby compressing the spring and moving the end groove 606 laterally to the corresponding locking ball 604 position, ensuring that the locking ball 604 can move outward into the end groove 606. Then, the connector is moved... The sleeve 6 is fitted onto the outside of the connector 7, at which point the convex ring 702 abuts against the inner protrusion of the outer cylinder 601, and the slot 701 moves to the corresponding receiving groove 603. Then, the movable sleeve 605 is released, and the spring pushes the movable sleeve 605 to the inner wall to abut against the locking ball 604, thereby pressing the locking ball 604 inward into the slot 701. The locking ball 604 locks the slot 701 and the receiving groove 603, completing the quick installation and connection of the connecting sleeve 6 on the outside of the connector 7; then open The valve on the bellows 501 is activated to open the foam delivery channel. Then, the turntable 805 is rotated, driving the screw 804 to rotate. The screw 804 drives the support arm 807 to move the pressure plate 806 downwards, which in turn feeds the foam extinguishing agent downwards into the bellows 501. After passing through the foam gun 5, the foam extinguishing agent generates foam and flows along the connector 7 into the bottom of the foam tank 1. The foam pushes the float 201 inside the foam tank 1 upwards. The balance block 203, in conjunction with the pull rope 202, controls the float 201. The counterweight is balanced to ensure that the float 201 floats upward under the support of foam. The rise of the float 201 serves as a display component for the foam generation height. At the same time, the downward movement of the balance block 203 on the height gauge 9 represents the rising height of the float 201, which is also the foam generation height. The downward movement of the auxiliary block 808 at the top of the support arm 807 represents the consumption height of the foam extinguishing agent. By corresponding the heights of the two, the total volume of foam generated and the volume of extinguishing agent consumed can be obtained, so as to directly obtain the volume expansion ratio.

[0038] By setting a float plate 201 inside the foaming tank 1 as a measuring component for detecting the foam volume, and setting a balance block 203 to connect the float plate 201 with a pull rope 202, it is ensured that the float plate 201 can be pushed up to display the foam volume during the foam formation process in the foaming tank 1. Thus, the corresponding amount of foam generated can be obtained while the foam mixture is output in any quantity. Furthermore, the foaming coefficient can be directly obtained by dividing the generated foam volume by the consumed foam mixture volume, thereby improving the problem of large errors in the existing method of inaccurately measuring the total amount of foam generated and indirectly calculating the volume foaming coefficient by weight.

[0039] In addition, a weighing platform 3 is set at the bottom of the foaming tank 1, and a quick-release pipe joint is set to connect the foam gun 5 and the foaming tank 1 so as to realize the function of weighing foam weight, thereby retaining the structure of indirectly calculating the foaming coefficient by weighing foam and combining foam mixture density, making the function more complete.

[0040] Furthermore, the balance block 203, which serves as the foam volume indicator, and the auxiliary block 808, which serves as the mixed liquid volume indicator, are arranged side by side on both sides of the height gauge 9. This allows for a direct reading of the foam generation volume and the volume consumed by the foam mixture. It also facilitates the dynamic reading of the multiples of the data on both sides during the foam generation process. In other words, the foaming multiple can be recorded transiently during the foam generation process, avoiding the impact of foam breakage when reading after foaming is completed, thus improving the detection accuracy.

[0041] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A device for detecting the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent, characterized in that: The device includes a foaming tank (1) and a metering component (2). The metering component (2) is slidably mounted inside the foaming tank (1). A weighing platform (3) is provided below the foaming tank (1). A storage tank (4) is provided on the outside of the foaming tank (1). A foam gun (5) is connected to the side of the storage tank (4) near the foaming tank (1). A connector (7) is provided on the outside of the bottom end of the foaming tank (1). A connecting sleeve (6) connected to the foam gun (5) is detachably connected to the outside of the connector (7). A can lid (8) is provided at the top opening of the storage tank (4). A height gauge (9) is provided between the can lid (8) and the foaming tank (1). The quantitative component (2) includes a float (201) that is vertically sealed to the inner wall of the foaming tank (1). A pull rope (202) that extends vertically out of the top opening of the foaming tank (1) is fixed to the top of the float (201). An inner guide wheel (101) that supports the pull rope (202) is provided in the middle of the top opening of the foaming tank (1). An outer guide wheel (102) that guides the outer end of the pull rope (202) to extend downward is provided on the outside of the foaming tank (1). The inner guide wheel (101) is coaxially provided with a rotating shaft (101a) that is longitudinally fixed to the inner wall of the foaming tank (1) and supports the rotation of the inner guide wheel (101). The outer guide wheel (102) is provided with a rotating frame (102a) fixed to the outer wall of the foaming tank (1). The outer end of the pull rope (202) is fixed with a balance block (203) that pulls the pull rope (202) downward, and the balance block (203) has the same weight as the float (201).

2. The device for detecting the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent according to claim 1, characterized in that: The inner wall of the foaming tank (1) is fixed with a guide ear (103) on the side away from the balance block (203). The top of the float (201) is fixed with an operating rod (205) that runs vertically through the guide ear (103). The operating rod (205) and the guide ear (103) are fitted with a clearance. The top of the operating rod (205) is fixed with a handle (206).

3. The device for detecting the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent according to claim 2, characterized in that: The height gauge (9) is provided with a scale value (901) on the front side with the top of the height gauge (9) as the starting point of the vertical height. The balance block (203) has a vertical groove (204) that can be snapped onto the outside of the height gauge (9) and slide vertically with the height gauge (9). The bottom of the height gauge (9) is fixed with a mounting plate (902) that extends laterally to the outer wall of the foaming tank (1) and is fixedly connected to the side wall of the foaming tank (1).

4. The device for detecting the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent according to claim 3, characterized in that: The bottom end of the storage tank (4) is flush with the bottom end of the foaming tank (1), and the bottom end of the storage tank (4) is provided with a support (401) to support the storage tank (4).

5. The device for detecting the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent according to claim 4, characterized in that: The foam gun (5) is connected to a corrugated pipe (501) with a flexible hose structure at one end away from the foaming tank (1). The corrugated pipe (501) extends to the outside of the bottom end of the storage tank (4) and is connected to the storage tank (4). A switch valve is provided on the corrugated pipe (501).

6. The device for detecting the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent according to claim 5, characterized in that: The connector (7) is a cylindrical structure fixed below the float (201) at the bottom of the foaming tank (1). The connector (7) has a groove (701) with an isosceles trapezoidal cross section on its outer circumference. The connector (7) has a chamfered insertion port (703) on the outer side near the connecting sleeve (6). The connector (7) has a protruding ring (702) on its outer circumference near the connecting sleeve (6). The connecting sleeve (6) includes an outer cylinder (601) that is connected to the outlet of the foam gun (5) through a flange. The outer cylinder (601) has a guide groove (602) on its outer side. The guide groove (602) is fitted with a movable sleeve (605) that extends to the outside of the groove (701).

7. The device for detecting the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent according to claim 6, characterized in that: The outer cylinder (601) is provided with multiple sets of receiving grooves (603) around the slot (701) in which locking balls (604) are embedded. The inner port of the receiving groove (603) converges inward to prevent the locking ball (604) from coming out of the receiving groove (603). The inner side of the locking ball (604) is engaged with the slot (701). The inner side of the outer end of the movable sleeve (605) is provided with an end groove (606) for receiving the locking ball (604) from coming out of the slot (701). The other end of the movable sleeve (605) is fixed with a guide ring (605b) that extends into the guide groove (602) and is in clearance fit with the guide groove (602). The guide groove (602) is provided with a spring that pushes the guide ring (605b) to press against the protruding ring (702). The outer circumference of the movable sleeve (605) is provided with an anti-slip groove (605a).

8. The device for detecting the expansion ratio of a premixed aqueous film-forming foam fire extinguishing agent according to claim 7, characterized in that: A U-shaped mounting bracket (801) is fixed to the side of the can lid (8) near the height gauge (9). A constraint groove (802) runs vertically through the can lid (8) on the bottom side of the mounting bracket (801). A support arm (807) slides vertically inside the constraint groove (802). A pressure plate (806) that slides vertically and seals against the inner wall of the storage tank (4) is fixed to the bottom of the support arm (807). A bearing seat (803) is provided in the middle of the mounting bracket (801). A screw (804) that passes through the support arm (807) is vertically rotatably fitted in the middle of the bearing seat (803). The screw (804) is threaded into the support arm (807). A turntable (805) is fixed to the top of the screw (804). An auxiliary block (808) with its top side flush with the top side of the height gauge (9) is fixed to the top of the support arm (807).

Images