A real-time monitoring device for fire truck foam tank liquid level

Abstract

The application discloses a real-time monitoring device for a fire truck foam tank liquid level, and relates to the technical field of fire-fighting equipment. The device comprises a tank body, an inlet and outlet pipeline arranged at the bottom of the tank body, a valve arranged on the inlet and outlet pipeline, a monitoring assembly arranged in the tank body, a pressing plate and a displacement sensor. The pressing plate is arranged in the tank body in a sliding mode, and slides along the height direction of the tank body. The area of the pressing plate is the same as the cross-sectional area of the tank body. The displacement sensor is arranged on the side of the pressing plate facing the top of the tank body. The application has the effects of reducing the damage of the monitoring device and improving the detection accuracy.

Description

Technical Field

[0001] This application relates to the field of fire-fighting equipment, and in particular to a real-time monitoring device for the liquid level in a fire truck foam box. Background Technology

[0002] The foam tank on a fire truck, also called a foam liquid tank, is a core component specifically designed to store foam extinguishing agents. It's as important as a water tank, but instead of water, it contains a special agent that mixes with water during firefighting to produce highly effective extinguishing foam.

[0003] When fire trucks are extinguishing fires, they need to ensure the amount of foam in the foam box to cope with emergencies. Therefore, fire truck foam boxes are usually equipped with liquid level monitoring equipment. Existing liquid level detection methods include pressure sensors installed at the bottom of the foam box to determine the liquid level by detecting water pressure, and ultrasonic transmitters and receivers installed at the top of the foam box to determine the liquid level by transmitting, reflecting and receiving ultrasonic waves. However, pressure sensors need to be placed in liquid, and the liquid in the foam box can easily corrode and damage the pressure sensors. Ultrasonic detection is also easily affected by foam, which can lead to inaccuracies in liquid level detection. Summary of the Invention

[0004] To reduce damage to monitoring equipment and improve detection accuracy, this application provides a real-time monitoring device for the liquid level in a fire truck foam box.

[0005] The real-time monitoring device for the liquid level of a fire truck foam box provided in this application adopts the following technical solution: A real-time monitoring device for the liquid level of a foam box in a fire truck includes a box body with inlet and outlet pipes at the bottom and valves installed on the pipes. A monitoring component is installed inside the box body, including a pressure plate and a displacement sensor. The pressure plate is slidably disposed inside the box body and slides along the height of the box body. The area of ​​the pressure plate is the same as the cross-sectional area inside the box body. The displacement sensor is embedded in the side of the pressure plate facing the top of the box body.

[0006] By adopting the above technical solution, a pressure plate is placed on the liquid surface, and the position of the pressure plate is detected by a displacement sensor to determine the liquid level. The displacement sensor is placed above the liquid level and will not be corroded by the liquid. The pressure plate can also squeeze the foam on the liquid surface, thereby reducing the impact of the foam on the liquid level monitoring. This achieves the effect of reducing damage to the monitoring equipment and improving the detection accuracy.

[0007] Preferably, the pressure plate is evenly distributed with a plurality of puncture needles on the side facing the bottom of the box.

[0008] By adopting the above technical solution, the puncture needle can puncture the foam floating on the liquid surface when the pressure plate is pressed on the liquid surface, thereby further reducing the impact of foam on the accuracy of liquid surface monitoring.

[0009] Preferably, a rope is fixed to the pressure plate on the side facing the top of the box, and the rope passes through the top of the box and extends out of the box.

[0010] By adopting the above technical solution, the rope can be set up to facilitate manual driving of the pressure plate. When replenishing the foam extinguishing agent in the tank, the pressure plate can be driven to slide away from the liquid surface by pulling the rope, thereby reducing the impact of the pressure plate on the replenishment of the foam extinguishing agent.

[0011] Preferably, a rotating platform is installed on the top of the box, and a winding roller is rotatably mounted on the rotating platform. The end of the rope away from the pressure plate is fixed to the winding roller.

[0012] By adopting the above technical solution, the winding roller can facilitate the winding and storage of the rope, thereby reducing the probability that the rope will be carried into the box by the pressure plate.

[0013] Preferably, the take-up roller is connected to a rotating handle.

[0014] By adopting the above technical solution, the rotating handle can be conveniently driven to wind up the rope.

[0015] Preferably, the housing includes a receiving box and an end cap, the receiving box has an opening at the top, and the end cap is detachably placed on the top of the receiving box, covering and closing the opening of the receiving box.

[0016] By adopting the above technical solution, the split-type cabinet can be easily opened for internal cleaning.

[0017] Preferably, a disassembly assembly is provided between the end cap and the receiving box. The disassembly assembly includes a disassembly slot, a disassembly plug, a reinforcing slot, a reinforcing plug, and a reinforcing spring. The reinforcing slot is opened on the side of the end cap facing the receiving box. The disassembly plug is fixed to the box body on the side facing the end cap. The reinforcing slot is opened on the side wall of the disassembly plug. The reinforcing plug is slidably disposed on the end cap along the side wall of the disassembly slot. The reinforcing spring is disposed between the reinforcing plug and the end cap. The elastic force of the reinforcing spring drives the reinforcing plug to slide into the disassembly slot. When the disassembly plug is inserted into the disassembly slot, the reinforcing plug slides into the reinforcing slot.

[0018] By adopting the above technical solution, the disassembly and assembly components are used for the disassembly, assembly, and reinforcement of the end cap on the receiving box, thereby providing strength and stability for the assembly of the end cap and the receiving box when it is not necessary to separate the end cap and the receiving box.

[0019] Preferably, a lever is fixed on the reinforcing insert, and a sliding groove is provided on the end cover, with the lever slidably disposed in the sliding groove.

[0020] By adopting the above technical solution, the setting of the push block can easily drive the reinforcing plug, thereby facilitating the separation of the end cover and the receiving box when it is necessary to separate them.

[0021] Preferably, the end cap sidewall is slidably provided with a positioning block, and the pressure plate sidewall is provided with a positioning slot. When the pressure plate slides to abut the end cap, the positioning block is inserted into the positioning slot.

[0022] By adopting the above technical solution, the positioning block can fix the pressure plate on the end cover, thereby facilitating the fixation of the pressure plate when the end cover and the receiving box are separated, and reducing the probability of the pressure plate slipping and falling off.

[0023] Preferably, a driving assembly is provided between the positioning plug and the end cover. The driving assembly includes a driving spring and a driving block. The driving spring is disposed between the positioning plug and the end cover. The elastic force of the driving spring drives the positioning plug to slide out of the end cover. The driving block is slidably disposed at the bottom of the disassembly slot. The sliding of the driving block causes the positioning plug to slide and be stored inside the end cover.

[0024] By adopting the above technical solution, the drive component can drive the positioning block to detach from the end cover after the end cover is installed and fixed in the receiving box, thereby disconnecting the fixing of the pressure block when the end cover is installed in the receiving box, so that the pressure block can be used normally.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The pressure plate is placed on the liquid surface, and the position of the pressure plate is detected by the displacement sensor to determine the liquid level. The displacement sensor is placed above the liquid level and will not be corroded by the liquid. The pressure plate can also squeeze the foam on the liquid surface, thereby reducing the impact of the foam on the liquid level monitoring. This achieves the effect of reducing damage to the monitoring equipment and improving the detection accuracy. At the same time, the pressure plate can also provide pressure for the foam extinguishing agent when the liquid level is too low and the pressure is insufficient, thereby assisting the foam extinguishing agent to be discharged from the tank. 2. The puncture needles are arranged in rows on the pressure plate. When the pressure plate is pressed against the liquid surface, the puncture needles can puncture the foam floating on the liquid surface, thereby further reducing the impact of foam on the accuracy of liquid surface monitoring. 3. The rope design allows for easy manual operation of the pressure plate. When replenishing the foam extinguishing agent in the tank, the pressure plate can be moved away from the liquid surface by pulling the rope, reducing the impact of the pressure plate on the replenishment of the foam extinguishing agent. At the same time, if the pressure plate shifts, it can be leveled by pulling the rope. 4. The modular design of the cabinet allows for easy opening for internal cleaning, and also enables adjustment of the pressure plate when it shifts and cannot be adjusted by pulling the rope. 5. The disassembly and assembly components are used for disassembling and reinforcing the end caps on the housing, thereby providing strength and stability for the assembly of the end caps and housings when it is not necessary to separate the end caps and housings; 6. The positioning block can fix the pressure plate on the end cover, so that the pressure plate can be easily fixed when the end cover and the receiving box are separated, reducing the probability of the pressure plate slipping and falling off; the drive component can drive the positioning block to disengage from the end cover after the end cover is installed and fixed to the receiving box, so that the pressure block can be unfixed when the end cover is installed in the receiving box, allowing the pressure block to be used normally. Attached Figure Description

[0026] Figure 1 This is an isometric schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a partial cross-sectional view of the overall structure of an embodiment of this application; Figure 3 This is an enlarged view of part A in section 2; Figure 4 This is a partial cross-sectional view of the overall structure of an embodiment of this application from another perspective; Figure 5 This is an enlarged view of section B in section 4; Reference numerals: 1. Housing; 101. Receiving box; 102. End cap; 2. Inlet / outlet pipe; 3. Valve; 4. Monitoring component; 41. Pressure plate; 42. Displacement sensor; 5. Puncture needle; 6. Rope; 7. Rotating table; 8. Rewinding roller; 9. Rotating handle; 10. Stepped annular groove; 11. Stepped annular block; 12. Sealing ring; 13. Mounting plate; 14. Mounting hole; 15. Disassembly / assembly component; 151. Disassembly / assembly slot; 152. Disassembly / assembly insert; 153. Reinforcement slot; 154. Reinforcement insert; 155. Reinforcement spring; 16. Positioning insert; 17. Positioning slot; 18. Drive component; 181. Drive spring; 182. Drive block; 19. Pulley; 20. Sliding groove. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0028] First, it should be noted that in the description of this application, the use of directional terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for descriptive purposes and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of numerical quantifiers such as "first," "second," and "third" is for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, in this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, interference fits, transition fits, or integral connections; they can refer to direct connections or indirect connections through an intermediate medium. Therefore, those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] This application discloses a real-time monitoring device for the liquid level in a fire truck's foam box, referring to... Figure 1 , Figure 2 and Figure 3The system includes a cubic box 1 made of stainless steel to reduce the probability of rusting due to long-term storage of foam extinguishing agent. An inlet / outlet pipe 2 is located at the bottom of the box 1, and a valve 3 is installed on the inlet / outlet pipe 2. A foam extinguishing agent source is connected to the inlet / outlet pipe 2 to replenish the foam extinguishing agent inside the box 1, and a nozzle is connected to the inlet / outlet pipe 2 to allow external spraying. A monitoring component 4 is installed inside the box 1, including a pressure plate 41 and a displacement sensor 42. The pressure plate 41 is slidably disposed within the box 1 and is configured to... The form of floating on the surface of the foam extinguishing agent can be achieved by using materials capable of floating on the surface of the foam extinguishing agent, or by setting the pressure plate 41 as a hollow structure capable of floating on the surface of the foam extinguishing agent. Simultaneously, the pressure plate 41 needs to control its own weight, pressing against the liquid level surface of the foam extinguishing agent by its own weight. The pressure plate 41 slides along the height direction of the machine body by its own weight. The area of ​​the pressure plate 41 is the same as the cross-sectional area inside the housing 1, thus allowing the pressure plate 41 to fit and separate the housing 1. A displacement sensor 42 is embedded on the side of the pressure plate 41 facing the top of the housing 1, and the displacement sensor 42 detects the pressure plate. The distance from the top of the tank 1 to one end of the current position is measured within the tank 1. The current position of the pressure plate 41 is determined based on the moving distance of the pressure plate 41, thereby determining the liquid level. The pressure plate 41 is pressed against the liquid surface, and the position of the pressure plate 41 is detected by the displacement sensor 42 to determine the liquid level. The displacement sensor 42 is positioned above the liquid level and will not be corroded by the liquid. The pressure plate 41 can also squeeze the foam on the liquid surface, thereby reducing the impact of the foam on the liquid level monitoring. This achieves the effect of reducing damage to the monitoring equipment and improving the detection accuracy. At the same time, the pressure plate 41 can also squeeze the foam. When the extinguishing agent level is too low and the pressure is insufficient, pressure is provided to the foam extinguishing agent to assist the foam extinguishing agent in being discharged from the tank 1. Several displacement sensors 42 are embedded in the pressure plate 41. In this embodiment, four displacement sensors 42 are set and respectively set at the four corners of the pressure plate 41. By monitoring at multiple points and performing data analysis, the accuracy of monitoring can be improved on the one hand, and the condition of the pressure plate 41 can be understood on the other hand. When multiple monitoring data are different, it means that the pressure plate 41 has shifted. At this time, the staff needs to troubleshoot the pressure plate 41 to ensure the normal use of the pressure plate 41.

[0030] Reference Figure 2 and Figure 3 Several puncture needles 5 are evenly distributed on the side of the pressure plate 41 facing the bottom of the box 1. The puncture needles 5 are arranged in a row on the pressure plate 41. When the pressure plate 41 is pressed on the liquid surface, the puncture needles 5 can puncture the foam floating on the liquid surface, thereby further reducing the impact of foam on the accuracy of liquid surface monitoring.

[0031] Reference Figure 1 and Figure 2A rope 6, made of steel wire rope, is fixed to the side of the pressure plate 41 facing the top of the container 1. One end of the rope 6 is fixed to the center of the pressure plate 41, and the rope 6 passes through the top of the container 1 and extends out of the container 1. The rope 6 allows for easy manual driving of the pressure plate 41. When the container 1 is replenished with foam extinguishing agent, pulling the rope 6 drives the pressure plate 41 to slide off the liquid surface, reducing the impact of the pressure plate 41 on the replenishment of the foam extinguishing agent. At the same time, if the pressure plate 41 shifts, it can be leveled by pulling the rope 6. A rotating platform 7 is installed on the top of the container 1. A winding roller 8 is rotatably mounted on the rotating platform 7. The end of the rope 6 away from the pressure plate 41 is fixed to the winding roller 8. The winding roller 8 allows for easy manual driving of the rope 6. The winding and storage of the rope 6 reduces the probability of the rope 6 being pulled into the housing 1 by the pressure plate 41. A rotating handle 9 is connected to the winding roller 8, which facilitates the winding of the rope 6. Alternatively, a motor can be connected to the winding roller 8 to drive its rotation. The motor driving the winding roller 8 should be a motor without self-locking function and with low rotational resistance to reduce the impact of motor rotational resistance on the slippage of the pressure plate 41. In this embodiment, the wire connecting the displacement sensor 42 can be wrapped with the rope 6, extend out of the housing 1 along the rope 6, and then pass through the center of the winding roller 8 to allow the displacement sensor 42 to be electrically connected to the control module.

[0032] Reference Figure 1 , Figure 2 and Figure 3 The housing 1 includes a receiving box 101 and an end cap 102. The receiving box 101 has an opening at its top. The end cap 102 is detachably mounted on the top of the receiving box 101, closing the opening. The receiving box 101 has an annular stepped groove 10 at its top. A stepped ring block 11, adapted to the stepped groove, is fixed on the end cap 102. The cooperation between the stepped groove 10 and the stepped ring block 11 enhances the tightness of the connection between the end cap 102 and the receiving box 101. A sealing ring 12 is embedded in the side wall of the stepped groove 10. The embedded sealing ring 12 improves the sealing of the receiving box 101. The sealing performance at the connection between the container 101 and the end cap 102 reduces the probability of foam extinguishing agent leaking out from the gap between the container 101 and the end cap 102. The split-type container 1 can be easily opened for internal cleaning, and the pressure plate 41 can be adjusted by opening the container 1 when the pressure plate 41 is misaligned and cannot be adjusted by pulling the rope 6. A mounting plate 13 is welded and fixed on the container 1. The mounting plate 13 has mounting holes 14. The mounting holes 14 are oblong holes. The container 1 is fixed on the fire truck by inserting bolts and other fasteners through the mounting holes 14.

[0033] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5A disassembly assembly 15 is provided between the end cap 102 and the receiving box 101. The disassembly assembly 15 is used for disassembling and reinforcing the end cap 102 on the receiving box 101, thereby providing the end cap 102 and the receiving box 101 with firmness and stability when they do not need to be separated. In this embodiment, a set of disassembly assemblies 15 is provided on each of the four sides of the box 1. The disassembly assembly 15 includes a disassembly slot 151, a disassembly insert 152, a reinforcing slot 153, a reinforcing insert 154, and a reinforcing spring 155. The reinforcing slot 153 is opened on the side of the end cap 102 facing the receiving box 101, and the disassembly insert 154 is opened on the side facing the receiving box 101. 2. Fixed to the side of the housing 1 facing the end cover 102, a reinforcing slot 153 is formed on the side wall of the disassembly and assembly block 152. Two reinforcing slots 153 are provided, one on each side wall at both ends of the length direction of the disassembly and assembly block 152. Two reinforcing blocks 154 are slidably disposed on the end cover 102 along the side wall of the disassembly and assembly slot 151. The reinforcing blocks 154 are slidably disposed on the end cover 102 along the two side walls of the disassembly and assembly slot 151. The reinforcing blocks 154 extend into the disassembly and assembly slot 151 or are stored in the side wall of the disassembly and assembly slot 151 by sliding. A reinforcing spring 155 is provided on the reinforcing blocks 154 and the end cover. Between 102, the elastic force of the reinforcing spring 155 drives the reinforcing insert 154 to slide into the disassembly slot 151. When the disassembly insert 152 is inserted into the disassembly slot 151, the reinforcing insert 154 slides into the reinforcing slot 153. The disassembly insert 152 into the disassembly slot 151 achieves the docking of the housing 101 and the end cap 102. Then, the reinforcing insert 154 into the reinforcing slot 153 restricts the separation between the end cap 102 and the housing 101. The reinforcing insert 154 has a chamfer on the side facing the opening of the disassembly slot 151. The chamfer can drive the reinforcement by abutting the disassembly insert 152 when it is inserted. The reinforcing insert 154 slides, and when the reinforcing insert 154 is aligned with the reinforcing slot 153, the reinforcing insert 154 is inserted into the reinforcing slot 153 under the elastic force of the reinforcing spring 155. A lever 19 is fixed on the reinforcing insert 154, and a sliding groove 20 is opened on the end cover 102. The lever 19 is slidably disposed in the sliding groove 20. By driving the lever 19 to slide in the sliding groove 20, the reinforcing insert 154 can be slid, so that the reinforcing insert 154 can be disengaged from the reinforcing slot 153 by sliding, and the disassembly insert 152 can be disengaged from the disassembly slot 151, which facilitates the disassembly and separation of the end cover 102 and the receiving box 101.

[0034] Reference Figure 2 and Figure 3A positioning block 16 is slidably provided on the side wall of the end cap 102, and a positioning slot 17 is provided on the side wall of the pressure plate 41. When the pressure plate 41 slides to abut against the end cap 102, the positioning block 16 is inserted into the positioning slot 17. The positioning block 16, in conjunction with the positioning slot 17, can fix the pressure plate 41 on the end cap 102, thereby reducing the probability that the pressure plate 41 will cause the rope 6 to slide on the end cap 102 after the end cap 102 is removed, thus reducing the impact of the pressure plate 41 sliding randomly on the placement and storage of the end cap 102. A driving assembly 18 is provided between the positioning block 16 and the end cap 102. The driving assembly 18 includes a driving spring 181 and a driving block 182. The driving spring 181 is located between the positioning block 16 and the end cap 102. The elastic force of the driving spring 181 drives the positioning block 16 to slide out of the end cap 102, and the driving block 182 is slidably located in the disassembly and assembly slot 15. At the bottom, the driving block 182 abuts against the positioning insert 16. A wedge-shaped surface is provided at the abutment point between the positioning insert 16 and the driving block 182. The driving block slides and abuts against the wedge-shaped surface, causing the positioning insert 16 to slide and be stored in the end cover 102. When the disassembly insert 152 is inserted into the disassembly slot 151, the disassembly insert 152 abuts and causes the driving block 182 to slide. The driving block 182 causes the positioning insert 16 to slide away from the pressure plate 41, so that the pressure plate 41 can contact the positioning fixation when the end cover 102 is installed in the receiving box 101, thus enabling normal use. The positioning insert 16 has a chamfer on the side facing the pressure plate 41. When the pressure plate 41 slides to abut against the end cover 102, it drives the positioning insert 16 to slide through the chamfer. When the positioning insert 16 is aligned with the positioning slot 17, the driving spring 181 drives the positioning insert 16 to slide and insert into the positioning slot 17.

[0035] The implementation principle of this application embodiment is as follows: Rope 6 is passed through end cap 102 and fixed to pressure plate 41. Displacement sensor 42 is embedded in pressure plate 41. Then, take-up roller 8 is installed on end cap 102, and the other end of rope 6 is fixed to take-up roller 8. Taking up rope 6 drives pressure plate 41 to abut against end cap 102. At this time, positioning block 16 is inserted into positioning slot 17 of pressure plate 41 to position pressure plate 41 on end cap 102. Receiving box 101 is installed and fixed on the fire truck, and foam extinguishing agent is filled into receiving box 101. Finally, end cap 102 is placed on receiving box 101. After the four disassembly blocks 152 around the container 101 are inserted into the disassembly slots 151, the reinforcing blocks 154 are engaged in the reinforcing slots 153 by the elastic force of the reinforcing springs 155, thus fixing the end cap 102 and the container 101 together. At the same time, the disassembly blocks 152, inserted into the disassembly slots 151, drive the drive block 182 to slide. The drive block 182 drives the positioning block 16 to slide away from the pressure plate 41. The pressure plate 41 slides down under its own weight and comes into contact with the foam extinguishing agent liquid surface. When the pressure plate 41 comes into contact with the foam extinguishing agent liquid surface, the piercing needle 5 on the pressure plate 41 extinguishes the foam fire. The foam on the surface of the agent is punctured, and the displacement sensor 42 detects the movement distance of the pressure plate 41 to determine the liquid level of the foam extinguishing agent. When the monitoring detects that the liquid level of the foam extinguishing agent in the tank 1 has dropped to the preset warning value, the foam extinguishing agent source is connected through the inlet / outlet pipe 2, and the valve 3 is opened to replenish the foam extinguishing agent into the tank 1. When replenishing the foam extinguishing agent, the pressure of the pressure plate 41 can be reduced by rotating the winding roller 8 to wind up the rope 6. After the foam extinguishing agent replenishment is completed, the force applied to the winding roller 8 is released, allowing the pressure plate 41 to abut against the pressure plate again. When it is necessary to control the amount of foam extinguishing agent replenished, the winding roller 8 cannot be used to wind up the rope 6. Instead, the replenished foam extinguishing agent drives the pressure plate 41 to slide, thereby monitoring the level of the foam extinguishing agent. When the level of the foam extinguishing agent reaches the preset value, the replenishment of foam extinguishing agent to the tank 1 is stopped. When it is necessary to use the foam extinguishing agent, the nozzle and the inlet / outlet pipe 2 are connected through the pipeline, the valve 3 is opened, and the foam extinguishing agent is sprayed onto the fire source through the nozzle. During the spraying process, the pressure plate 41 provides pressure to the foam extinguishing agent through its own weight to assist the spraying of the foam extinguishing agent.

[0036] It should be noted that the above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. Although this specification has described this application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. A real-time monitoring device for the liquid level of a fire truck foam tank, comprising a tank body (1), wherein an inlet / outlet pipe (2) is provided at the bottom of the tank body (1), and a valve (3) is installed on the inlet / outlet pipe (2), characterized in that: The housing (1) is equipped with a monitoring component (4), which includes a pressure plate (41) and a displacement sensor (42). The pressure plate (41) is slidably disposed inside the housing (1) and slides along the height direction of the housing. The area of ​​the pressure plate (41) is the same as the cross-sectional area inside the housing (1). The displacement sensor (42) is embedded on the side of the pressure plate (41) facing the top of the housing (1).

2. The real-time monitoring device for the liquid level of a fire truck foam box according to claim 1, characterized in that: The pressure plate (41) is evenly distributed with several puncture needles (5) on the side facing the bottom of the box (1).

3. The real-time monitoring device for the liquid level of a fire truck foam box according to claim 2, characterized in that: The pressure plate (41) is fixed with a rope (6) on the side facing the top of the box (1), and the rope (6) extends out of the box (1) through the top of the box (1).

4. The real-time monitoring device for the liquid level of a fire truck foam box according to claim 3, characterized in that: The top of the box (1) is equipped with a rotating platform (7), and a winding roller (8) is rotatably mounted on the rotating platform (7). The end of the rope (6) away from the pressure plate (41) is fixed to the winding roller (8).

5. A real-time monitoring device for the liquid level of a fire truck foam box according to claim 4, characterized in that: A rotating handle (9) is connected to the take-up roller (8).

6. The real-time monitoring device for the liquid level of a fire truck foam box according to claim 5, characterized in that: The box (1) includes a receiving box (101) and an end cap (102). The receiving box (101) has an opening at the top, and the end cap (102) is detachably placed on the top of the receiving box (101) to cover and close the opening of the receiving box (101).

7. A real-time monitoring device for the liquid level of a fire truck foam box according to claim 6, characterized in that: A disassembly assembly (15) is provided between the end cap (102) and the receiving box (101). The disassembly assembly (15) includes a disassembly slot (151), a disassembly insert (152), a reinforcing slot (153), a reinforcing insert (154), and a reinforcing spring (155). The reinforcing slot (153) is located on the side of the end cap (102) facing the receiving box (101). The disassembly insert (152) is fixed to the side of the box (1) facing the end cap (102). The reinforcing slot (153) is located on the side of the box (1) facing the end cap (102). The reinforcing insert (154) is slidably disposed on the end cap (102) on the side wall of the disassembly and assembly slot (151). The reinforcing spring (155) is disposed between the reinforcing insert (154) and the end cap (102). The elastic force of the reinforcing spring (155) drives the reinforcing insert (154) to slide into the disassembly and assembly slot (151). When the disassembly and assembly insert (152) is inserted into the disassembly and assembly slot (151), the reinforcing insert (154) slides into the reinforcing slot (153).

8. A real-time monitoring device for the liquid level of a fire truck foam box according to claim 7, characterized in that: The reinforcing insert (154) is fixed with a lever (19), and the end cap (102) is provided with a sliding groove (20), and the lever (19) is slidably disposed in the sliding groove (20).

9. A real-time monitoring device for the liquid level of a fire truck foam box according to claim 8, characterized in that: The end cap (102) has a slidable positioning block (16) on its side wall, and the pressure plate (41) has a positioning slot (17) on its side wall. When the pressure plate (41) slides to abut the end cap (102), the positioning block (16) is inserted into the positioning slot (17).

10. A real-time monitoring device for the liquid level of a fire truck foam box according to claim 9, characterized in that: A drive assembly (18) is provided between the positioning plug (16) and the end cover (102). The drive assembly (18) includes a drive spring (181) and a drive block (182). The drive spring (181) is located between the positioning plug (16) and the end cover (102). The elastic force of the drive spring (181) drives the positioning plug (16) to slide out of the end cover (102). The drive block (182) is slidably located at the bottom of the disassembly slot (151). The sliding of the drive block (182) causes the positioning plug (16) to slide and be stored in the end cover (102).

Images