A signal connection device for an amphibious fire truck

Abstract

The present invention belongs to the technical field of signal element protection devices, and particularly relates to a signal connection device for an amphibious fire truck, which includes a protection box and a signal element main body. The signal element main body is fixed inside the protection box, and further includes: a waterproof connector module, assembled on the protection box, for preventing liquid from flowing into the interior of the protection box; a cooling mechanism, assembled on the protection box, for dissipating heat inside the protection box; the waterproof connector module includes a clamping mechanism and a sealing mechanism; the clamping mechanism is used to fix the wire; the sealing mechanism is used to improve the sealing performance of the waterproof connector module. The present invention can fix wires with different diameters, avoid wire loosening caused by vehicle jolts, improve the sealing performance of the device, prevent liquid from entering the device along the wires with smaller diameters, and at the same time, improve the heat dissipation performance of the device, avoid heat aging of signal processing elements, and extend the service life of signal processing elements.

Description

Technical Field

[0001] The invention belongs to the technical field of signal element protection devices, and particularly relates to a signal connection device for an amphibious fire truck. Background Art

[0002] A fire truck, also known as a fire engine, is a vehicle designed and manufactured according to needs to be suitable for firefighters to ride in, equipped with various fire-fighting equipment or fire extinguishants, and is used by fire departments for fire extinguishing, assisting in fire extinguishing or fire rescue. Fire departments in most countries, including China, also use it for other emergency rescue purposes. A fire truck can transport firefighters to the disaster site and provide them with a variety of tools for disaster relief tasks. Fire trucks come in a variety of types and functions, and different types of fire trucks are applied in different fields. Among many types of fire trucks, an amphibious fire truck is a fire truck that can travel on land and in water. Most of its interior is equipped with two sets of power systems. After connecting the power systems and signal processing components through a variety of wires, different power systems are enabled through the signal processing components, enabling the fire truck to travel on water or on land.

[0003] Since an amphibious fire truck needs to travel in water, in order to avoid short circuits when the signal processing components come into contact with liquid, it is necessary to provide waterproof protection for the signal processing components. In the prior art, most of the signal processing components are protected by placing them inside the signal connection device. However, most of the existing signal connection devices cannot fix wires with different diameters. During driving, the vehicle's bumps easily cause the wires to become loose. Moreover, the existing signal connection devices have poor sealing performance for wires with different diameters, and liquid will enter the device along the wires with smaller diameters, causing short circuits in the signal processing components. At the same time, the signal processing components generate heat during operation, and most of the existing devices focus on sealing performance and have poor heat dissipation functions for the signal processing components. Being in a high-temperature environment for a long time easily causes aging of the signal processing components and reduces the service life of the signal processing components. Summary of the Invention

[0004] The purpose of the invention is to provide a signal connection device for an amphibious fire truck, which can fix wires with different diameters, avoid wire loosening caused by vehicle bumps, improve the sealing performance of the device, prevent liquid from entering the device along the wires with smaller diameters, and at the same time, improve the heat dissipation performance of the device, avoid heat aging of the signal processing components, and extend the service life of the signal processing components.

[0005] The technical solutions adopted by the invention are specifically as follows:

[0006] A signal connection device for an amphibious fire truck, comprising a protective box and a signal element body. The signal element body is fixed inside the protective box. A heat dissipation cavity is formed between the lower inner wall of the protective box and the signal element body. The device further includes:

[0007] A cooling mechanism, assembled inside the protective box and located inside the heat dissipation cavity, and both ends of the cooling mechanism extend to the outside of the protective box for dissipating heat inside the protective box;

[0008] A waterproof connector module, assembled on one side of the protective box. The inside of the waterproof connector module is used for inserting a wire, and this wire is used to connect the signal element body to an external power source;

[0009] Wherein, the waterproof connector module includes a clamping mechanism and a sealing mechanism;

[0010] The clamping mechanism is assembled on the protective box for clamping the wire;

[0011] The sealing mechanism is connected to the clamping mechanism for preventing liquid from entering the protective box.

[0012] Further, the clamping mechanism includes a wire threading sleeve, a fastening nut, a clamping sleeve, a driving unit and a diameter-changing unit. The wire threading sleeve is arranged at one end of the protective box. The fastening nut is threadedly connected to one end outside the wire threading sleeve. The clamping sleeve is fixed to the end of the wire threading sleeve away from the fastening nut. Both the driving unit and the diameter-changing unit are assembled on the clamping sleeve.

[0013] Further, the driving unit includes a driving sleeve and an internal thread transmission ring. The driving sleeve is rotatably connected to the outside of the clamping sleeve, and the internal thread transmission ring is fixed inside the driving sleeve.

[0014] Further, a bayonet is arranged at one end of the driving sleeve, and an annular limiting groove is formed on the outside of the clamping sleeve. The bayonet is assembled inside the annular limiting groove, and the driving sleeve and the clamping sleeve are rotatably connected through the bayonet and the annular limiting groove.

[0015] Further, the variable diameter unit includes a driving threaded cylinder, a plurality of guiding pin rods, a plurality of driven clamping blocks, and a plurality of elastic reset elements. The driving threaded cylinder is threadedly connected to the inside of the internal threaded transmission ring, and a driving surface is provided at one end of the driving threaded cylinder close to the clamping sleeve. A plurality of guiding anti-rotation grooves are uniformly provided inside the driving threaded cylinder. The plurality of guiding pin rods are respectively slidably connected to the inside of the plurality of guiding anti-rotation grooves, and the guiding pin rods are fixedly connected to the clamping sleeve. The plurality of driven clamping blocks are respectively slidably connected to the outside of the plurality of guiding pin rods, and a driven surface adapted to the driving surface is provided at the upper end of the driven clamping block. The plurality of elastic reset elements are respectively assembled between the plurality of driven clamping blocks and the plurality of elastic reset elements.

[0016] Further, the driving surface is conical.

[0017] Further, the sealing mechanism includes a sealing sleeve, a plurality of hollow rubber rings, an elastic washer, a shunt pipe, and a one-way air nozzle. The sealing sleeve is fixed to one end of the driving sleeve. A plurality of annular grooves are provided inside the sealing sleeve. The plurality of hollow rubber rings are respectively fixed to the inside of the plurality of annular grooves. The elastic washer is fixed to one end of the sealing sleeve. The shunt pipe is fixed to the upper ends of the plurality of hollow rubber rings. The one-way air nozzle is fixed to the upper end of the shunt pipe.

[0018] Further, a detachable sealing plug is threadedly connected to one end of the sealing sleeve away from the hollow rubber ring.

[0019] Further, the cooling mechanism includes a micro vacuum pump, an S-shaped heat dissipation pipe, a plurality of fastening sleeves, a plurality of first breathable waterproof membranes, a one-way valve, and a plurality of second breathable waterproof membranes. The micro vacuum pump and the S-shaped heat dissipation pipe are both fixed inside the protective box. The input end of the S-shaped heat dissipation pipe is connected to the output end of the micro vacuum pump, and the output end of the S-shaped heat dissipation pipe extends to the outside of the protective box;

[0020] A plurality of first air outlet holes are uniformly provided on the outside of the S-shaped heat dissipation pipe. A plurality of fastening sleeves are uniformly fixed to the outside of the S-shaped heat dissipation pipe. Second air outlet holes adapted to the first air outlet holes are provided on the outside of the plurality of fastening sleeves. The plurality of first breathable waterproof membranes are respectively assembled between the plurality of first air outlet holes and the plurality of second air outlet holes. The one-way valve is fixed to the output end of the S-shaped heat dissipation pipe. The plurality of second breathable waterproof membranes are fixed inside the protective box, and exhaust holes adapted to the second breathable waterproof membranes are provided on the outside of the protective box.

[0021] The technical effects achieved by the present invention are:

[0022] By rotating the driving sleeve, the present invention can drive the operation of the driving unit, and the driving unit drives the diameter-changing unit to clamp wires of different diameters, thereby avoiding the loosening of the wires caused by the bumping of the vehicle during driving;

[0023] By injecting air into the hollow rubber ring through the one-way air nozzle, the hollow rubber ring expands and deforms, and the deformed hollow rubber ring fits tightly with wires of different diameters, preventing liquid from entering the device along the wires with a smaller diameter and causing a short circuit of the signal processing element;

[0024] By the operation of the micro vacuum pump, the air outside the device enters the inside of the S-shaped heat dissipation tube. The air inside the S-shaped heat dissipation tube passes through the first breathable waterproof membrane to filter dust and water vapor, then enters the inside of the protection box, and is discharged outside the device through the second breathable waterproof membrane, taking away the heat inside the device at the same time, cooling the inside of the device, preventing the signal processing element from being in a high-temperature environment for a long time, and extending the service life of the signal processing element. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the whole of the present invention;

[0026] Figure 2 is an exploded view of the whole structure of the present invention;

[0027] Figure 3 is a schematic diagram of the whole waterproof joint module of the present invention;

[0028] Figure 4 is a cross-sectional view of the whole waterproof joint module of the present invention;

[0029] Figure 5 is the present invention Figure 4 an enlarged view of part A in;

[0030] Figure 6 is an exploded view of the structure of the clamping mechanism of the present invention;

[0031] Figure 7 is the present invention Figure 6 an enlarged view of part B in;

[0032] Figure 8 is an exploded view of the structure of the sealing mechanism of the present invention;

[0033] Figure 9 is a cross-sectional view of the sealing sleeve of the present invention;

[0034] Figure 10 is a schematic diagram of the whole cooling mechanism of the present invention;

[0035] Figure 11 is a partial cross-sectional view of the cooling mechanism of the present invention;

[0036] Figure 12 Cross-sectional view of the S-shaped heat dissipation pipe and the dust filtering and water blocking film in Embodiment 2 of the present invention.

[0037] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0038] 1. Protective box; 2. Signal element main body; 3. Threading sleeve; 4. Tightening nut; 5. Clamping sleeve; 6. Driving sleeve; 7. Internal thread driving ring; 8. Driving threaded barrel; 9. Guiding anti-rotation groove; 10. Guiding pin rod; 11. Driven clamping block; 12. Elastic reset element; 13. Sealing sleeve; 14. Hollow rubber ring; 15. Elastic washer; 16. Diverging pipe; 17. One-way air nozzle; 18. Sealing plug; 19. Micro vacuum pump; 20. S-shaped heat dissipation pipe; 21. Tightening sleeve; 22. First breathable and waterproof film; 23. One-way valve; 24. Second breathable and waterproof film; 25. Cooling hole; 26. Dust filtering and water blocking film. Detailed implementation manners

[0039] In order to make the purpose and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention.

[0040] Embodiment 1:

[0041] As Figure 1-2 shown, a signal connection device for an amphibious fire truck includes a protective box (1) and a signal element main body (2). The signal element main body (2) is fixed inside the protective box (1). A heat dissipation cavity is formed between the lower inner wall of the protective box 1 and the signal element main body 2. It further includes:

[0042] A cooling mechanism, assembled inside the protective box 1 and located inside the heat dissipation cavity, and both ends of the cooling mechanism extend to the outside of the protective box 1 for dissipating heat from the inside of the protective box 1;

[0043] A waterproof joint module, assembled on one side of the protective box 1. The inside of the waterproof joint module is used for threading a wire, and this wire is used to connect the signal element main body 2 to an external power source;

[0044] Among them, the waterproof joint module includes a clamping mechanism and a sealing mechanism;

[0045] The clamping mechanism is assembled on the protective box 1 for clamping the wire;

[0046] The sealing mechanism is connected to the clamping mechanism for preventing liquid from entering the protective box 1;

[0047] As Figure 3-5As shown in the figure, the clamping mechanism includes a wire threading sleeve 3, a fastening nut 4, a clamping sleeve 5, a driving unit and a diameter-changing unit. The wire threading sleeve 3 is arranged at one end of the protective box 1. The fastening nut 4 is threadedly connected to one end outside the wire threading sleeve 3. The clamping sleeve 5 is fixed to the end of the wire threading sleeve 3 away from the fastening nut 4. Both the driving unit and the diameter-changing unit are assembled on the clamping sleeve 5;

[0048] Specifically, the driving unit is used to drive the diameter-changing unit to operate, and the diameter-changing unit is used to fix wires with different diameters;

[0049] It can be understood that after the wire passes through the inside of the clamping mechanism, the driving unit is used to drive the diameter-changing unit to operate, and the diameter-changing unit is used to fixedly clamp wires with different diameters;

[0050] Furthermore, rubber sealing rings are assembled between the fastening nut 4 and the protective box 1, and between the clamping sleeve 5 and the protective box 1, which is convenient for improving the sealing performance inside the protective box 1 and preventing liquid from entering the inside of the protective box 1 along the wire threading sleeve 3;

[0051] As Figure 5-6 shown in the figure, the driving unit includes a driving sleeve 6 and an internal thread transmission ring 7. The driving sleeve 6 is rotatably connected to the outside of the clamping sleeve 5, and the internal thread transmission ring 7 is fixed inside the driving sleeve 6;

[0052] Specifically, when the driving sleeve 6 is rotated, due to the fixed connection between the driving sleeve 6 and the internal thread transmission ring 7, the driving sleeve 6 drives the internal thread transmission ring 7 to rotate, and the internal thread transmission ring 7 drives the diameter-changing unit to operate, thereby enabling the diameter-changing unit to clamp the wire;

[0053] As Figure 5 shown in the figure, a bayonet is arranged at one end of the driving sleeve 6, and an annular limiting groove is formed on the outside of the clamping sleeve 5. The bayonet is assembled inside the annular limiting groove, and the driving sleeve 6 and the clamping sleeve 5 are rotationally connected through the bayonet and the annular limiting groove;

[0054] Specifically, sealing rings are arranged on the diameters of the clamping sleeve 5 and the driving sleeve 6 to improve the sealing performance of the waterproof joint module;

[0055] As Figure 4 、 Figure 6 and Figure 7As shown in the figure, the variable diameter unit includes a driving threaded cylinder 8, a plurality of guiding pin rods 10, a plurality of driven clamping blocks 11 and a plurality of elastic reset elements 12. The driving threaded cylinder 8 is threadedly connected to the inside of the internal thread driving ring 7, and a driving surface is provided at one end of the driving threaded cylinder 8 close to the clamping sleeve 5. A plurality of guiding anti-rotation grooves 9 are uniformly provided inside the driving threaded cylinder 8. The plurality of guiding pin rods 10 are respectively slidably connected to the inside of the plurality of guiding anti-rotation grooves 9, and the guiding pin rods 10 are fixedly connected to the clamping sleeve 5. The plurality of driven clamping blocks 11 are respectively slidably connected to the outside of the plurality of guiding pin rods 10, and a driven surface adapted to the driving surface is provided at the upper end of the driven clamping block 11. The plurality of elastic reset elements 12 are respectively assembled between the plurality of driven clamping blocks 11 and the plurality of elastic reset elements 12;

[0056] Specifically, after the driving unit operates, due to the fixed connection between the clamping sleeve 5 and the guiding pin rods 10 and the sliding connection between the guiding pin rods 10 and the driving threaded cylinder 8, the driving threaded cylinder 8 cannot rotate. Due to the threaded connection between the internal thread driving ring 7 and the driving threaded cylinder 8, the internal thread driving ring 7 drives the driving threaded cylinder 8 to move. Then, the driven clamping block 11 is driven to move downward through the driving surface provided inside the driving threaded cylinder 8. As a result, the distance between two adjacent driven clamping blocks 11 becomes smaller. When the driven clamping block 11 is in contact with the wire, through the cooperation of the plurality of driven clamping blocks 11, the wire is clamped and fixed, so that the device is convenient for clamping wires with different diameters and avoids the wire from loosening due to vehicle bumps;

[0057] The driving surface is conical;

[0058] Specifically, since the driven surface at the top of the driven clamping block 11 always fits with the driving surface, the conical driving surface can prevent the driven clamping block 11 from rotating;

[0059] As Figure 8-9 shown, the sealing mechanism includes a sealing sleeve 13, a plurality of hollow rubber rings 14, an elastic washer 15, a shunt pipe 16, and a one-way air nozzle 17. The sealing sleeve 13 is fixed to one end of the driving sleeve 6. A plurality of annular grooves are provided inside the sealing sleeve 13. The plurality of hollow rubber rings 14 are respectively fixed to the inside of the plurality of annular grooves. The elastic washer 15 is fixed to one end of the sealing sleeve 13. The shunt pipe 16 is fixed to the upper ends of the plurality of hollow rubber rings 14. The one-way air nozzle 17 is fixed to the upper end of the shunt pipe 16;

[0060] Specifically, gas is injected into the hollow rubber ring 14 through the one-way air nozzle 17, so that the hollow rubber ring 14 expands and deforms. After the hollow rubber ring 14 expands, it fits tightly with the wire, thus preventing liquid from entering the protection box 1 along the wire with a smaller diameter;

[0061] One end of the sealing sleeve 13 away from the hollow rubber ring 14 is threadedly connected with a detachable sealing plug 18;

[0062] Specifically, when no wire is inserted into the waterproof joint module, the sealing plug 18 is installed on the outside of the sealing sleeve 13 to seal the waterproof joint module;

[0063] A cooling mechanism is assembled on the protective box 1 for dissipating heat inside the protective box 1;

[0064] Specifically, a cover plate is rotatably connected to the upper end of the protective box 1 for facilitating the maintenance and installation of the signal element main body 2. A sealing ring is assembled between the protective box 1 and the cover plate to improve the sealing performance inside the protective box 1;

[0065] Such as Figure 10-11 As shown, the cooling mechanism includes a micro vacuum pump 19, an S-shaped heat dissipation pipe 20, a plurality of fastening sleeves 21, a plurality of first breathable waterproof membranes 22, a one-way valve 23, and a plurality of second breathable waterproof membranes 24. The micro vacuum pump 19 and the S-shaped heat dissipation pipe 20 are both fixed inside the protective box 1. The input end of the S-shaped heat dissipation pipe 20 is connected to the output end of the micro vacuum pump 19, and the output end of the S-shaped heat dissipation pipe 20 extends to the outside of the protective box 1;

[0066] A plurality of first air outlet holes are evenly formed on the outside of the S-shaped heat dissipation pipe 20. A plurality of fastening sleeves 21 are evenly fixed on the outside of the S-shaped heat dissipation pipe 20. Second air outlet holes adapted to the first air outlet holes are formed on the outside of the plurality of fastening sleeves 21. A plurality of first breathable waterproof membranes 22 are respectively assembled between the plurality of first air outlet holes and the plurality of second air outlet holes. The one-way valve 23 is fixed to the output end of the S-shaped heat dissipation pipe 20. A plurality of second breathable waterproof membranes 24 are fixed inside the protective box 1, and exhaust holes adapted to the second breathable waterproof membranes 24 are formed on the outside of the protective box 1;

[0067] Specifically, an air inlet pipe is arranged on the outside of the protective box 1, and one end of the air inlet pipe is connected to the input end of the micro vacuum pump 19;

[0068] It can be understood that through the operation of the micro vacuum pump 19, the gas outside the device enters the inside of the S-shaped heat dissipation pipe 20. The one-way valve 23 is in a closed state. The gas inside the S-shaped heat dissipation pipe 20 enters the inside of the protective box 1 after being filtered by the first breathable waterproof membrane 22 due to the action of pressure. After the gas inside the protective box 1 accumulates, the pressure increases, so that the gas inside the protective box 1 flows out to the outside of the protective box 1 through the second breathable waterproof membrane 24, and at the same time takes away the heat inside the protective box 1 to cool down the inside of the protective box 1;

[0069] Further, the waterproof and breathable membrane is an existing mature technology, which is a polymer microporous waterproof and breathable material with functions such as dust and water protection, breathable pressure relief, microporous exhaust, internal and external pressure balance, moisture and corrosion protection, heat dissipation and cooling. It has an IP68 waterproof rating, which is also the highest level of waterproof and dustproof at present. In theory, it can be immersed underwater for a long time at a depth of dozens of meters, which will not be elaborated here.

[0070] The working principle of the present invention is as follows: The wire penetrates through the waterproof joint module and is electrically connected to the signal element body 2. Rotate the driving sleeve 6 to make the driving unit operate. Driven by the operation of the driving unit, the variable diameter unit moves. After the variable diameter unit operates, the distance between two adjacent driven clamping blocks 11 gradually decreases. Through the cooperation of multiple driven clamping blocks 11, wires with different diameters are clamped.

[0071] Gas is injected into the hollow rubber ring 14 through the one-way air nozzle 17, causing the hollow rubber ring 14 to expand and deform. After the hollow rubber ring 14 expands, it fits tightly with the wire, thereby preventing liquid from entering the protection box 1 along the wire with a smaller diameter.

[0072] Through the operation of the micro vacuum pump 19, the gas outside the device enters the inside of the S-shaped heat dissipation tube 20. The one-way valve 23 is in a closed state. The gas inside the S-shaped heat dissipation tube 20 enters the protection box 1 after being filtered by the first breathable waterproof membrane 22 due to the pressure. After the gas inside the protection box 1 accumulates, the pressure increases, causing the gas inside the protection box 1 to flow out to the outside of the protection box 1 through the second breathable waterproof membrane 24, taking away the heat inside the protection box 1 at the same time and cooling the inside of the protection box 1.

[0073] Embodiment 2:

[0074] This embodiment is a further extension based on Embodiment 1, and the difference from Embodiment 1 lies only in the cooling mechanism.

[0075] Please refer to Figure 12 , the cooling mechanism includes a micro vacuum pump 19 and an S-shaped heat dissipation tube 20. The micro vacuum pump 19 and the S-shaped heat dissipation tube 20 are both fixed inside the protection box 1. The input end of the S-shaped heat dissipation tube 20 is connected to the output end of the micro vacuum pump (19), and the output end of the S-shaped heat dissipation tube 20 extends to the outside of the protection box 1. A number of cooling holes 25 are provided on the S-shaped heat dissipation tube 20, and dust-filtering and water-blocking membranes 26 are coated on both the inside and outside of the S-shaped heat dissipation tube 20.

[0076] In this embodiment, by directly coating the dust-filtering and water-blocking membrane 26 on the S-shaped heat dissipation tube 20, unnecessary structural settings are reduced. Compared with the conventional settings, the contact area between the gas and the dust-filtering and water-blocking membrane 26 can be increased, the gas penetration rate can be improved, and thus the cooling effect of the cooling mechanism can be improved.

[0077] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A signal connection device for an amphibious fire truck, comprising a protective box (1) and a signal element main body (2). The signal element main body (2) is fixed inside the protective box (1), and a heat dissipation cavity is formed between the lower inner wall of the protective box (1) and the signal element main body (2). It is characterized in that, Further included are: A cooling mechanism, assembled inside the protective box (1) and located inside the heat dissipation cavity, and both ends of the cooling mechanism extend outside the protective box (1) for dissipating heat inside the protective box (1); A waterproof joint module, assembled on one side of the protective box (1), and the inside of the waterproof joint module is used for threading a wire, and this wire is used to connect the signal element body (2) to an external power supply; Wherein, the waterproof joint module includes a clamping mechanism and a sealing mechanism; The clamping mechanism is assembled on the protective box (1) for clamping the wire; The sealing mechanism is connected to the clamping mechanism for preventing liquid from entering the protective box (1); The clamping mechanism includes a wire threading sleeve (3), a fastening nut (4), a clamping sleeve (5), a driving unit and a diameter-changing unit. The wire threading sleeve (3) is arranged at one end of the protective box (1), the fastening nut (4) is threadedly connected to one end outside the wire threading sleeve (3), the clamping sleeve (5) is fixed to the end of the wire threading sleeve (3) away from the fastening nut (4), and the driving unit and the diameter-changing unit are both assembled on the clamping sleeve (5); The driving unit includes a driving sleeve (6) and an internal thread driving ring (7). The driving sleeve (6) is rotatably connected to the outside of the clamping sleeve (5), and the internal thread driving ring (7) is fixed inside the driving sleeve (6); One end of the driving sleeve (6) is provided with a bayonet, and an annular limiting groove is formed on the outside of the clamping sleeve (5). The bayonet is assembled inside the annular limiting groove, and the driving sleeve (6) and the clamping sleeve (5) are rotatably connected through the bayonet and the annular limiting groove; The diameter-changing unit includes a driving threaded cylinder (8), a plurality of guiding pin rods (10), a plurality of driven clamping blocks (11) and a plurality of elastic reset elements (12). The driving threaded cylinder (8) is threadedly connected to the inside of the internal thread driving ring (7), and a driving surface is formed at one end of the driving threaded cylinder (8) close to the clamping sleeve (5). A plurality of guiding anti-rotation grooves (9) are uniformly formed inside the driving threaded cylinder (8). The plurality of guiding pin rods (10) are respectively slidably connected to the inside of the plurality of guiding anti-rotation grooves (9), and the guiding pin rods (10) are fixedly connected to the clamping sleeve (5). The plurality of driven clamping blocks (11) are respectively slidably connected to the outside of the plurality of guiding pin rods (10), and a driven surface adapted to the driving surface is formed at the upper end of the driven clamping block (11). The plurality of elastic reset elements (12) are respectively assembled between the plurality of driven clamping blocks (11) and the plurality of elastic reset elements (12); The driving surface is conical.

2. The signal connection device for an amphibious fire truck according to claim 1, characterized in that: The sealing mechanism includes a sealing sleeve (13), a plurality of hollow rubber rings (14), an elastic washer (15), a shunt pipe (16), and a one-way air nozzle (17). The sealing sleeve (13) is fixed to one end of the drive sleeve (6). A plurality of annular grooves are formed inside the sealing sleeve (13), and the plurality of hollow rubber rings (14) are respectively fixed inside the plurality of annular grooves. The elastic washer (15) is fixed to one end of the sealing sleeve (13). The shunt pipe (16) is fixed to the upper ends of the plurality of hollow rubber rings (14), and the one-way air nozzle (17) is fixed to the upper end of the shunt pipe (16).

3. The signal connection device for an amphibious fire truck according to claim 2, characterized in that: A detachable sealing plug (18) is threadedly connected to the end of the sealing sleeve (13) away from the hollow rubber ring (14).

4. The signal connection device for an amphibious fire truck according to claim 1, characterized in that: The cooling mechanism includes a micro vacuum pump (19), an S-shaped heat dissipation pipe (20), a plurality of fastening sleeves (21), a plurality of first breathable waterproof membranes (22), a one-way valve (23), and a plurality of second breathable waterproof membranes (24). The micro vacuum pump (19) and the S-shaped heat dissipation pipe (20) are both fixed inside the protective box (1). The input end of the S-shaped heat dissipation pipe (20) is connected to the output end of the micro vacuum pump (19), and the output end of the S-shaped heat dissipation pipe (20) extends to the outside of the protective box (1). A plurality of first air outlet holes are evenly formed on the outer side of the S-shaped heat dissipation pipe (20). The plurality of fastening sleeves (21) are evenly fixed to the outer side of the S-shaped heat dissipation pipe (20). Second air outlet holes adapted to the first air outlet holes are formed on the outer sides of the plurality of fastening sleeves (21). The plurality of first breathable waterproof membranes (22) are respectively assembled between the plurality of first air outlet holes and the plurality of second air outlet holes. The one-way valve (23) is fixed to the output end of the S-shaped heat dissipation pipe (20). The plurality of second breathable waterproof membranes (24) are fixed inside the protective box (1), and exhaust holes adapted to the second breathable waterproof membranes (24) are formed on the outside of the protective box (1).

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