A rescue fire truck with CAFS system

Abstract

The present invention relates to the technical field of fire fighting equipment, and in particular to an emergency fire truck with a CAFS system, wherein a base is sleeved on the outer wall of a nozzle, the top and bottom surfaces of the base are arc-shaped structures, and are sliding areas, two half-tubes are respectively slidably arranged on the top and bottom surfaces of the base, the two half-tubes are mirror-distributed, and the two half-tubes are symmetrical along an axis, a push rod is arranged on the side wall of the base, a connecting block is arranged on the output end of the push rod, the first ends of the two connecting rods are respectively hinged on the connecting block, the second ends of the two connecting rods are respectively hinged on the outer walls of the two half-tubes, two first coil springs are respectively arranged at the connection between the two connecting rods and the connecting block, two second coil springs are respectively arranged at the connection between the two connecting rods and the two half-tubes, a locking mechanism is arranged on the outer walls of the two half-tubes, and a flip cover device is detachably installed on the ends of the two half-tubes, so as to improve the applicability of the system by changing the extension length of the nozzle.

Description

Technical Field

[0001] The present invention relates to the technical field of fire fighting equipment, in particular to an emergency rescue fire fighting truck with a CAFS system. Background Art

[0002] Emergency rescue fire trucks are important equipment for emergency rescue and fire fighting. They can provide rapid response and effective operation at the scene of sudden disasters and fires. With the development of fire fighting technology, compressed air foam systems (Compressed AirFoam The CAFS system has gradually become an important technology in the field of firefighting, especially in extinguishing fires that are difficult to extinguish with ordinary water flow. It has significant advantages. The CAFS system uses compressed air mixed with foam liquid and water to generate efficient fire extinguishing foam, which can cover the burning area, isolate oxygen, quickly cool the fire source, and reduce water loss. Although the CAFS system has many advantages in firefighting operations, there are still some problems in the design of the existing CAFS system nozzles, especially the defect that the nozzle length cannot be adjusted, which limits the flexibility and applicability of the system. Specifically, the nozzles in the existing CAFS system are usually fixed in length, which will cause many inconveniences in actual firefighting operations. The fixed-length nozzles also have the problem of insufficient adaptability when facing complex rescue scenes such as high-rise buildings. The traditional solution is usually to carry nozzles of different lengths to deal with different situations, but this method not only increases the burden on the equipment, but also makes the operation cumbersome, and increases the workload and reaction time of firefighters. In order to overcome the disadvantage that the nozzle length cannot be adjusted in the existing CAFS system, it is necessary to develop a new CAFS system with an adjustable nozzle length function. Summary of the invention

[0003] The object of the present invention is to provide an emergency rescue fire truck with a CAFS system, so as to improve the applicability of the system by changing the extension length of the nozzle.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a rescue fire truck with a CAFS system, comprising: a fire truck body and a nozzle, wherein the water inlet end of the nozzle (1) is connected to the water outlet end of the fire truck body, and is characterized in that it also includes:

[0005] A base is sleeved on the outer wall of the nozzle, and the top and bottom surfaces of the base are arc-shaped structures, which are sliding areas;

[0006] Two half-tubes are slidably disposed on the top surface and the bottom surface of the base, respectively, the two half-tubes are mirror-distributed, and the two half-tubes are symmetrical along the axis;

[0007] A push rod, arranged on the side wall of the base;

[0008] A connecting block, arranged at the output end of the push rod;

[0009] Two connecting rods, wherein the first ends of the two connecting rods are respectively hinged to the connecting blocks, and the second ends of the two connecting rods are respectively hinged to the outer walls of the two half pipes;

[0010] Two first coil springs, respectively arranged at the connection positions of the two connecting rods and the connecting block;

[0011] Two second coil springs, respectively arranged at the connection between the two connecting rods and the two half tubes;

[0012] A locking mechanism is arranged on the outer walls of the two half pipes;

[0013] The flip cover device is detachably mounted on the ends of the two half pipes.

[0014] Preferably, the connecting rod located above the horizontal axis of the connecting block is limited to rotating within the range above the horizontal line of the hinge point of the two, and the connecting rod located below the horizontal axis of the connecting block is limited to rotating within the range below the horizontal line of the hinge point of the two.

[0015] Preferably, the top and bottom surfaces of the base are respectively provided with double-layer plywood, the double-layer plywood includes an upper plate and a lower plate, the length of the lower plate of the double-layer plywood is smaller than the length of the upper plate of the double-layer plywood, the end of the upper plate of the double-layer plywood extends to the same plane as the end of the base, there is a gap between the upper plate of the double-layer plywood and the base, and the half pipe is slidably arranged in the gap.

[0016] Preferably, a sliding block is provided on the arc outer wall of the half pipe, and the sliding block is along the axial direction of the half pipe, and a sliding groove corresponding to the sliding block is provided on the arc inner wall of the upper plate of the double-layer plywood.

[0017] Preferably, the torsional stiffness of the two first coil springs is greater than the torsional stiffness of the two second coil springs.

[0018] Preferably, the bottom surface and the top surface of the base are in a gradually sloped structure near the edge of the water outlet end of the nozzle.

[0019] Preferably, a guide groove is provided between the connecting block and the base, and the guide groove extends along the movement direction of the connecting block.

[0020] Preferably, a ball bearing structure is provided in the arc-shaped sliding area of ​​the base, and the ball bearing is arranged along an arc-shaped track.

[0021] The present invention proposes a rescue fire truck with a CAFS system, which has the beneficial effect that: the present invention utilizes two half-pipes that move along the axial direction to form a complete tubular structure at the water outlet end of the nozzle, and the length of the nozzle is extended while ensuring that the nozzle diameter remains unchanged. The pipeline with the same diameter can maintain a stable water flow speed. At the same time, the extension of the nozzle length is conducive to the long-distance spraying of foam, increases the range of foam, and enables the foam to reach the target area more effectively, thereby achieving a better fire extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a first partial schematic diagram of the present invention;

[0024] Figure 3 This is a first partial explosion schematic diagram of the present invention;

[0025] Figure 4 It is a schematic diagram of the locking mechanism of the present invention;

[0026] Figure 5 It is a schematic diagram of the flip cover device of the present invention;

[0027] Figure 6 The present invention is a schematic diagram of the movable range of the connecting rod.

[0028] In the figure: 1, nozzle, 2, base, 3, half pipe, 4, push rod, 5, connecting block, 6, connecting rod, 7, first coil spring, 8, second coil spring, 9, locking mechanism, 911, upper half ring, 912, jack, 913, first auxiliary hole, 92, locking rod, 93, piston, 94, plug rod, 95, spring, 96, lower half ring, 97, reset rod, 98, lever, 99, second auxiliary hole, 10, flip cover device, 101, first fixed seat, 102, screw rod, 103, nozzle, 104, second fixed seat, 105, block, 11, double-layer splint, 12, slider, 13, slide groove. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-6The present invention provides a technical solution for an emergency rescue fire truck with a CAFS system. The detailed connection means are well known in the art. The following mainly introduces the working principle and process. The specific work is as follows.

[0031] A rescue fire truck with a CAFS system comprises: a fire truck body and a nozzle 1, wherein the water inlet end of the nozzle 1 is connected to the water outlet end of the fire truck body, the fire truck body has an installation space, the main components of the CAFS system include an air compressor, a water pump, a foam mixer, a pipeline and a storage tank, the nozzle 1 is directly connected to the end of the pipeline system of the CAFS system, and the pipeline system is responsible for conveying compressed air foam (CAF) generated by the air compressor, the water pump and the foam mixer to the nozzle 1 for use by firefighters in fire fighting and rescue operations. In some designs, the nozzle 1 may be connected to a diverter valve, which is used to control the flow direction of CAF, and can adjust the spray direction of the foam or distribute CAF to multiple nozzles 1 or outlets. The invention also comprises: a nozzle 1, a base 2, two half pipes 3, a push rod 4, a connecting block 5, two connecting rods 6, two first coil springs 7, two second coil springs 8, a locking mechanism 9 and a flip cover device 10.

[0032] The water outlet end face of the nozzle 1 is provided with an L-shaped flange, and the base 2 is sleeved on the outer wall of the nozzle 1. The top and bottom surfaces of the base 2 are arc-shaped structures, which are sliding areas. The two half-tubes 3 are respectively slidably arranged on the top and bottom surfaces of the base 2. The two half-tubes 3 are mirror-imaged, and the two half-tubes 3 are symmetrical along the axis. The two half-tubes 3 are two independent parts, which are designed to be symmetrically distributed along the axis. When the two half-tubes 3 located above and below are overlapped or butted against each other, a continuous, seamless tubular structure is formed. This design allows the two half-tubes 3 to maintain their respective integrity after being split, and to be restored to a circular pipe after being combined. The formed circular pipe is the extension of the nozzle 1, and the formed circular pipe has the same diameter as the nozzle 1. A notch matching the L-shaped flange is provided on the inner wall of the far end of the two half pipes 3 away from the water outlet end of the nozzle 1. The push rod 4 is arranged on the side wall of the base 2. The push rod 4 is arranged along the axial direction of the base 2. The output end of the push rod 4 extends along the axial direction of the base 2. The push rod 4 adopts a linear push rod 4, which can accurately control the extension speed and extension amount of the output end. At the same time, the control of the push rod 4 is controlled by the overall control system of the fire truck, which belongs to the prior art and is not shown in the text. The connecting block 5 is arranged at the output end of the push rod 4, and the connecting block 5 moves synchronously with the output end of the push rod 4. The two connecting rods 6 The first ends of the two connecting rods 6 are respectively hinged on the connecting blocks 5, and the second ends of the two connecting rods 6 are respectively hinged on the outer walls of the two half pipes 3. The two connecting rods 6 are completely symmetrical about the connecting block 5. Not only are they symmetrical in the initial position, but the movement paths are also symmetrical, so that the movement paths and movement states of the two half pipes 3 are consistent. Two first coil springs 7 are respectively arranged at the connection between the two connecting rods 6 and the connecting block 5. One end of the first coil spring 7 is fixed on the connecting block 5, and the other end is connected to the connecting rod 6. The first coil spring 7 provides a torque, the purpose of which is to pull the connecting rod 6 back from the inclined position. The coil spring stores energy with its elastic force and pushes the connecting rod 6 to move in the horizontal direction when released. The two second coil springs 8 are respectively arranged at the connection between the two connecting rods 6 and the two half pipes 3. One end of the second coil spring 8 is fixed on the connecting rod 6, and the other end is connected to the outer wall of the half pipe 3. At the same time, under the action of the second coil spring 8, when the half pipe 3 is in the maximum rotation range, the extension direction of the half pipe 3 will be consistent with the extension direction of the connecting rod 6. The locking mechanism 9 is arranged on the outer wall of the two half pipes 3. The number of the locking mechanism 9 is at least two, and they are respectively arranged in a mirror image on the two half pipes 3. On the outer walls of both sides of the tube 3, when the two half tubes 3 are butt-jointed with each other, the locking mechanism 9 is used to lock them to ensure the sealing between the two half tubes 3. The flap device 10 is detachably installed at the ends of the two half tubes 3. After the two half tubes 3 are butt-jointed, the nozzle 103 can be installed at the water outlet end of the two half tubes 3 to meet the foam spraying conditions. If foam spraying is required, the flap device 10 can be installed to ensure the foam spraying effect. If only water spraying is required, there is no need to install the flap device 10, and the spraying distance can be changed by changing the extension length of the nozzle 1.

[0033] The connecting rod 6 located above the horizontal axis of the connecting block 5 is limited to rotating within the range above the horizontal line of the hinge point of the connecting rod 6 and the connecting block 5, and the connecting rod 6 located below the horizontal axis of the connecting block 5 is limited to rotating within the range below the horizontal line of the hinge point of the connecting rod 6 and the connecting block 5. The purpose is that when the two half pipes 3 are moved to the water outlet end of the nozzle 1 and docked into a complete tubular structure, the extension direction of the connecting rod 6 is consistent with the axial direction of the tubular structure, thereby avoiding the problem of unstable docking effect of the two half pipes 3 due to excessive rotation angle of the two connecting rods 6.

[0034] The top and bottom surfaces of the base 2 are respectively provided with double-layer plywood 11, and the double-layer plywood 11 includes an upper plate and a lower plate. The length of the lower plate of the double-layer plywood 11 is less than the length of the upper plate of the double-layer plywood 11, and the end of the upper plate of the double-layer plywood 11 extends to the same plane as the end of the base 2. The side of the lower plate close to the nozzle 1 is aligned with the upper plate. The lower plate is arranged on the base 2, and there is a gap between the upper plate and the base 2 at the position where the lower plate is missing. The half pipe 3 is slidably arranged in the gap, and the upper plate is arranged on the lower plate. The upper plate is used to limit the movement direction of the half pipe 3 to ensure that the half pipe 3 slides out of the gap along its axial direction.

[0035] The arc outer wall of the half pipe 3 is provided with a slider 12, and the slider 12 slides along the axial direction of the half pipe 3. The arc inner wall of the upper plate of the double-layer plywood 11 is provided with a slide groove 13 corresponding to the slider 12. The sliding direction of the half pipe 3 is guaranteed by the restriction of the slider 12 and the slide groove 13, and the half pipe 3 is prevented from sliding in other directions.

[0036] The torsional stiffness of the two first coil springs 7 is greater than the torsional stiffness of the two second coil springs 8. When the flip cover device 10 is not installed, the first coil springs 7 and the second coil springs 8 can prevent the water outlet ends of the half pipes 3 from tilting outward when the half pipes 3 slide out of the gap and connect to form a complete tubular structure. After the two half pipes 3 are separated from the gap, the water outlet ends of the two half pipes 3 first contact each other, and then gradually complete the connection and closure as the two half pipes 3 move.

[0037] The bottom and top surfaces of the base 2 are in a gradually sloped structure near the edge of the water outlet end of the nozzle 1. When the two half-pipes 3 slide out of the gap and contact each other, the two half-pipes 3 are prevented from falling directly from the base 2 to the flange, so that the movement of the half-pipes 3 is smoother, and the two half-pipes 3 are prevented from colliding and jumping due to direct falling, which may cause the two half-pipes 3 to be unable to stably dock with the flange.

[0038] A guide groove is provided between the connecting block 5 and the base 2 , and the guide groove extends along the movement direction of the connecting block 5 , and is used to limit the movement track of the connecting block 5 , and ensure that it slides smoothly along a straight line.

[0039] A ball bearing structure is provided in the arc-shaped sliding area of ​​the base 2, and the ball bearing is arranged along an arc-shaped track to reduce the sliding friction of the half pipe 3 and improve the smoothness of the operation.

[0040] The locking mechanism 9 includes: an upper half ring 911, a plug hole 912, a first auxiliary hole 913, a locking rod 92, a piston 93, an insert rod 94, a spring 95, a lower half ring 96, a reset groove, a reset rod 97, a shift rod 98 and a second auxiliary hole 99.

[0041] The upper half ring 911 is arranged on the outer wall of one of the half tubes 3, and the lower half ring 96 is arranged on the outer wall of the other half tube 3. The upper half ring 911 and the lower half ring 96 can form a complete annular structure. At the same time, the upper half ring 911 and the lower half ring 96 are both provided with annular channels. The first end of the upper half ring 911 is a closed end. At the same time, the end surface of the first end of the upper half ring 911 is provided with a plug hole 912. The first end of the lower half ring 96 is a closed end, and the first end of the upper half ring 911 corresponds to the first end of the lower half ring 96. The locking rod 92 is a semi-annular rod-shaped structure. , slidingly arranged in the inner cavity (i.e., the annular channel) of the upper half ring 911, a piston 93 is arranged on one side of the locking rod 92 close to the first end of the upper half ring 911, the diameter of the piston 93 is larger than the diameter of the locking rod 92, the inner cavity of the upper half ring 911 is a variable diameter structure, the diameter of the position of the inner cavity of the upper half ring 911 close to the second end port is reduced, the activity space of the piston 93 is limited in the inner cavity of the upper half ring 911, thereby realizing the limitation of the extension length of the locking rod 92, and the piston 93 is provided with a plug rod 94, which can be snapped into the plug hole 912, and the plug rod 94 The far end of the distance locking rod 92 will move out of the end surface of the first end of the upper half ring 911, and a spring 95 is arranged between the piston 93 and the first end of the upper half ring 911. The elastic force of the spring 95 is less than the force required for the insertion rod 94 to disengage from the insertion hole 912. The side wall of the upper half ring 911 is provided with a first auxiliary hole 913, and the first auxiliary hole 913 is located near the first end of the upper half ring 911. At the same time, a corresponding second auxiliary hole 99 is arranged on the outer wall of the half pipe 3, so that the piston 93 and the first end of the upper half ring 911 are connected with the inner cavity of the half pipe 3, and the lower half A reset rod 97 is slidably provided in the inner cavity of the ring 96, and a lever 98 is provided on the outer wall of the reset rod 97. A reset groove is provided on the outer wall of the lower half ring 96, and the lever 98 is located in the reset groove. The reset rod 97 can slide in the lower half ring 96 by moving the lever 98. When the lever 98 moves to the maximum limit toward the second end of the lower half ring 96, the end face of the reset rod 97 and the end face of the second end of the lower half ring 96 are in the same plane. When the locking rod 92 is completely moved to the inner cavity of the upper half ring 911, the insertion rod 94 will be in a state of being clamped in the insertion hole 912.

[0042] The flip cover device 10 comprises: two first fixing seats 101 , a screw 102 , a nozzle 103 , two second fixing seats and a clamping block 105 .

[0043] The two first fixing seats 101 are mirror-mounted on the outer walls of the two half pipes 3 and are close to the water outlet ends of the two half pipes 3. The two first fixing seats 101 and the two half pipes 3 can rotate. The screw 102 is arranged in a vertical direction, and the two ends of the screw 102 are respectively screwed to the two first fixing seats 101. One side of the nozzle 103 is fixed at the middle position of the screw 102. The nozzle 103 can be tightly connected to the water outlet end of the tubular structure by rotating the screw 102. The two second fixing seats 104 are arranged on the two half pipes 3. The outer wall is located on the opposite side of the two first fixing seats 101, and the clamping block 105 is installed on the other side of the nozzle 103. When the clamping block 105 moves between the two second fixing seats 104, the two second fixing seats 104 move towards each other, and the clamping block 105 is clamped between the two second fixing seats 104 to ensure that the nozzle 103 is tightly fitted with the water outlet end of the tubular structure when the two half pipes 3 form a complete tubular structure. At the same time, a flange and a corresponding groove are also provided between the nozzle 103 and the water outlet end of the tubular structure to ensure the sealing of the connection.

[0044] The two first fixing seats 101 and the two screw rods 102 are screwed together. When the two first fixing seats 101 move toward each other, the screw rod 102 will be driven to rotate, and the nozzle 103 will rotate with the screw rod 102. When the two first fixing seats 101 move toward each other to the maximum limit, the two half-tubes 3 are completely fitted together, and the nozzle 103 is in a state of being tightly connected with the two half-tubes 3. At the same time, the clamping block 105 is clamped between the two second fixing seats 104. The upper and lower end faces of the clamping block 105 are inclined, and the end faces corresponding to the two second fixing seats 104 are inclined in the opposite direction to the end faces of the clamping block 105. The distance between the two second fixing seats 104 moving toward each other is gradually reduced, so that the clamping block 105 gradually moves to the water inlet side of the nozzle 1, so that the sealing between the nozzle 103 and the water outlet end of the tubular structure composed of the two half-tubes 3 is gradually strengthened.

[0045] Working principle:

[0046] Currently, fire trucks equipped with CAFS systems have both foam spraying and traditional water spraying functions. When encountering some fires, such as high-altitude fire sources, such as fires in high-rise buildings, short nozzles can be used for basic firefighting work in the initial stage to reduce the spread of the fire source and create favorable conditions for further processing. After the fire source is controlled in the early stage, the long nozzle can spray foam at a distance, covering high and difficult-to-access areas, providing safer firefighting operations.

[0047] In the initial stage, the nozzle 1 in the CAFS system is in a short tube state, that is, the two half-tubes 3 are located on the top and bottom surfaces of the base 2, and the nozzle 103 is at a position away from the water outlet ends of the two half-tubes 3. At this time, the direction of the nozzle 1 can be adjusted to perform basic fire extinguishing work to reduce the spread of the fire source. When favorable spatial conditions are created, the output end of the control push rod 4 is extended, and the connecting block 5 is synchronously moved toward the water outlet end of the nozzle 1. The two connecting rods 6 are used to drive the two half-tubes 3 to move synchronously in the water outlet direction of the nozzle 1. When the two half-tubes 3 are still in the upper plywood covering area of ​​the double-layer plywood 11, the two half-tubes 3 move in parallel directions. When the two half-tubes 3 leave the area, the water outlet ends of the two half-tubes 3 will slowly gather toward the axial position of the nozzle 1 until the water inlet ends of the two half-tubes 3 are separated from the base 2, and the two half-tubes 3 are butt-jointed into a complete tubular structure. At this time, flanges and other structures are used to tightly connect the tubular structure to the nozzle 1.

[0048] When the two half-tubes 3 are docked into a complete tubular structure, the upper half ring 911 and the lower half ring 96 fit tightly together to form a complete annular structure. The inner cavities of the upper half ring 911 and the lower half ring 96 are connected. When the upper half ring 911 and the lower half ring 96 fit together, the part of the insertion rod 94 located outside the upper half ring 911 is pushed into the inner cavity of the upper half ring 911 by the lower half ring 96, and the insertion rod 94 is released from the insertion hole 912. Under the action of the spring 95, the locking rod 92 will slide into the inner cavity of the lower half ring 96 and push the reset rod 97 to move to the first end of the lower half ring 96 to achieve the fixing effect of the two half-tubes 3 and ensure the sealing. At the same time, the part of the locking rod 92 inserted into the inner cavity of the lower half ring 96 is a variable diameter structure, and the diameter of the locking rod 92 at the far end of the piston 93 is the smallest. As the locking rod 92 is inserted, the sealing between the two half-tubes 3 is gradually strengthened. At the same time, under the action of the first auxiliary hole 913 and the second auxiliary hole 99, when the spraying operation is carried out, the pressure liquid in the tubular structure will enter the part between the piston 93 in the inner cavity of the upper half ring 911 and one end of the upper half ring 911, and use the water pressure to push the piston 93 to move toward the second end of the upper half ring 911, thereby further ensuring the locking effect of the locking mechanism 9 and ensuring that the two half-tubes 3 still maintain good sealing under high pressure. After use, the lever 98 can be pushed to push the reset rod 97 to prompt the locking rod 92 to move toward the first end of the upper half ring 911, so that the locking rod 92 is separated from the inner cavity of the lower half ring 96 until the insertion rod 94 is engaged in the insertion hole 912, thereby realizing the separation of the two half-tubes 3.

[0049] In the process that the two half pipes 3 change from a parallel state to gradually approaching and finally docking into a complete tubular structure, the distance between the two first fixing seats 101 gradually decreases, and because the two first fixing seats 101 and the two half pipes 3 are rotatably connected, the two first fixing seats 101 and the screw 102 will not affect the two half pipes 3. At the same time, as the two first fixing seats 101 approach, the screw 102 will be driven to rotate, and the nozzle 103 will move with the screw 102. As the two first fixing seats 101 move toward each other to the minimum spacing, the nozzle 103 will be completely attached to the water outlet end of the tubular structure, and the flange is cooperated to ensure the sealing effect. When the nozzle 103 rotates to be close to the water outlet ends of the two half pipes 3, the block 105 moves between the two second fixing seats 104. When the spacing between the two second fixing seats 104 moves to the minimum value, the two second fixing seats 104 fix the block 105 to ensure the fixing effect and sealing of the nozzle 103. At this time, a long-distance foam spraying operation can be carried out until the fire is extinguished.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fire rescue truck with a CAFS system, comprising: A fire truck body and a nozzle (1), wherein the water inlet end of the nozzle (1) is connected to the water outlet end of the fire truck body, and is characterized in that it also includes: A base (2) is sleeved on the outer wall of the nozzle (1), and the top and bottom surfaces of the base (2) are arc-shaped structures and serve as sliding areas; Two half tubes (3) are respectively slidably arranged on the top surface and the bottom surface of the base (2), the two half tubes (3) are mirror-imaged, and the two half tubes (3) are symmetrical along the axis; A push rod (4) is arranged on the side wall of the base (2); A connecting block (5) is arranged at the output end of the push rod (4); Two connecting rods (6), wherein the first ends of the two connecting rods (6) are respectively hinged to the connecting blocks (5), and the second ends of the two connecting rods (6) are respectively hinged to the outer walls of the two half pipes (3); Two first coil springs (7) are respectively arranged at the connection points between the two connecting rods (6) and the connecting block (5); Two second coil springs (8) are respectively arranged at the connection points between the two connecting rods (6) and the two half tubes (3); A locking mechanism (9) is arranged on the outer walls of the two half pipes (3); The flip cover device (10) is detachably mounted on the ends of the two half pipes (3).

2. The emergency rescue fire truck with CAFS system according to claim 1, characterized in that: The connecting rod (6) located above the horizontal axis of the connecting block (5) is limited to rotating within the range above the horizontal line of the hinge point of the two, and the connecting rod (6) located below the horizontal axis of the connecting block (5) is limited to rotating within the range below the horizontal line of the hinge point of the two.

3. The emergency rescue fire truck with CAFS system according to claim 1, characterized in that: The top surface and the bottom surface of the base (2) are respectively provided with double-layer plywood (11), and the double-layer plywood (11) comprises an upper plate and a lower plate, the length of the lower plate of the double-layer plywood (11) is shorter than the length of the upper plate of the double-layer plywood (11), the end of the upper plate of the double-layer plywood (11) extends to the same plane as the end of the base (2), and there is a gap between the upper plate of the double-layer plywood (11) and the base (2), and the half pipe (3) is slidably arranged in the gap.

4. The emergency rescue fire truck with CAFS system according to claim 3, characterized in that: The arc outer wall of the half pipe (3) is provided with a sliding block (12), and the sliding block (12) is arranged along the axial direction of the half pipe (3). The arc inner wall of the upper plate of the double-layer plywood (11) is provided with a sliding groove (13) corresponding to the sliding block (12).

5. The emergency rescue fire truck with CAFS system according to claim 1, characterized in that: The torsional rigidity of the first coil spring (7) is greater than the torsional rigidity of the second coil spring (8).

6. The emergency rescue fire truck with CAFS system according to claim 1, characterized in that: The bottom surface and the top surface of the base (2) are in a gradually changing sloped structure at the edges close to the water outlet end of the nozzle (1).

7. The emergency rescue fire truck with CAFS system according to claim 1, characterized in that: A guide groove is provided between the connection block (5) and the base (2), and the guide groove extends along the movement direction of the connection block (5).

8. The emergency rescue fire truck with CAFS system according to claim 1, characterized in that: A ball bearing structure is provided in the arc-shaped sliding area of ​​the base (2), and the ball bearing is arranged along an arc-shaped track.

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