CN214822398U - Low-cost portable semitrailer tire emergency inflation system - Google Patents

Abstract

The utility model belongs to the technical field of inflation system technology and specifically relates to a low-cost portable semitrailer tire emergency inflation system; the utility model discloses an air compressor machine and inflation gun that can dismantle and sealed gas circuit connects through the air duct to and be used for cooperating the locating component between tire and the inflation gun, the air compressor machine sets up on the automobile body of fixed setting between tractor and trailer, the inflation gun includes rifle body and rifle head, be equipped with the gas tube perpendicular to it on the face of rifle head end one side, still be equipped with the pressure relief pipe on the rifle body, the output of air compressor machine and the input of rifle body all are equipped with the interface tube with air duct complex, the interface tube on the inflation gun, the gas tube communicates with the pressure relief pipe three each other, the inside of interface tube is equipped with baroceptor, all be equipped with the solenoid valve on gas tube and the pressure relief pipe; the utility model discloses can solve prior art effectively and have the great scheduling problem of inconvenient and user's physical demands of use.

Description

Low-cost portable semitrailer tire emergency inflation system

Technical Field

The utility model relates to an inflation system technical field, concretely relates to emergent inflation system of low-cost portable semitrailer tire.

Background

At present, the holding quantity of domestic semitrailers is continuously increased, and the number of newly added various semitrailers reaches 70 thousands in 2018. The situation that the tire pressure is insufficient often happens when the semitrailer operates on the road. When the air pressure of the tire is insufficient, the tire is quickly worn, and the operation cost is increased; meanwhile, the tire burst probability is increased, and the danger is very high.

In the application number: the patent document CN202020063374.9 discloses a low-cost portable semitrailer tire emergency inflation system, and aims at solving the problem that the existing semitrailer tire is inconvenient to inflate, the system comprises a semitrailer, wherein a cross beam is arranged on the semitrailer, a gas storage tank is fixedly arranged at the top of the cross beam, an air compressor is fixedly arranged on the semitrailer, the air compressor is communicated with the gas storage tank, a gas outlet pipe is fixedly arranged on a gas outlet of the gas storage tank, one end, far away from the gas storage tank, of the gas outlet pipe is fixedly connected with an inflation gun, a gas pressure gauge is arranged on the inflation gun, a fixed seat is fixedly arranged on the semitrailer, and the inflation gun and the fixed seat are movably clamped; the utility model discloses an emergent inflation system of semitrailer tire characteristics is convenient and fast, can accomplish at any time and anywhere and aerify, and the process of aerifing simultaneously is costless, and the cost of whole set of system component is extremely low, has wide marketing prospect.

However, the following disadvantages still exist in the practical use process:

first, it is inconvenient to use because it requires the user to constantly observe the air gauge on the air gun during the process of inflating the tire to ensure that the air pressure inside the tire is proper, but this way, in the case of dark ambient light, it is difficult for the user to see the dial of the air gauge and to grasp that the inflation is stopped when the pointer of the air gauge reaches a specified value, i.e., the user needs to stop the inflation just before the pointer of the air gauge reaches a specified scale value and then inflate the tire little by little in a quick click manner to make the air pressure inside the tire reach a proper value, which increases the time of inflation virtually.

Secondly, the physical strength of the user is high, because the user needs to hold the air gun all the time during the process of inflating the tire, and the user presses the gun head of the air gun on the air tap of the tire all the time, so that the user consumes high physical strength.

SUMMERY OF THE UTILITY MODEL

The purpose of the utility model is to solve the shortcoming that exists among the prior art, solve the problem of proposing among the above-mentioned background art.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a low-cost portable semitrailer tire emergency inflation system comprises an air compressor, an inflation gun and a matching positioning assembly, wherein the air compressor and the inflation gun are detachably connected through an air duct in a sealed air path;

the air compressor is arranged on a vehicle body fixedly arranged between the tractor and the trailer and is powered by a vehicle-mounted power supply;

the inflatable gun comprises a gun body and a gun head which are perpendicular to each other, a display screen, a key module and a charging interface are arranged on the surface of the gun body, a PCB and a power supply module are arranged in an accommodating cavity in the gun body, a processing module and a storage module are arranged on the PCB, an inflatable tube perpendicular to the PCB is arranged on the surface of one side of the tail end of the gun head, a positioning table which is coaxial with the inflatable tube and matched with the positioning assembly is arranged on the surface of the other side of the tail end of the gun head, and a pressure relief tube is further arranged on the gun body;

the output end of the air compressor and the input end of the gun body are respectively provided with a connector tube matched with the air guide tube, the connector tube, the inflation tube and the pressure relief tube on the inflation gun are communicated with each other, an air pressure sensor is arranged inside the connector tube, and the inflation tube and the pressure relief tube are respectively provided with an electromagnetic valve;

the display screen, the key module, the charging interface, the power supply module, the air pressure sensor and the electromagnetic valve are all electrically connected to the PCB.

Furthermore, a containing box is fixedly arranged on the vehicle body between the tractor and the trailer, the containing box is divided into a first cavity, a second cavity and a third cavity through vertical partition plates, an air guide pipe, an inflation gun and a positioning assembly are respectively stored in the first cavity, the second cavity and the third cavity, a box opening at the top of the containing box is rotatably connected with a box cover matched with the box opening through a damping hinge shaft, and a hasp is arranged on the side wall of the box cover.

Furthermore, a pipe coiling wheel is rotatably connected inside the first cavity, a handle matched with the pipe coiling wheel is rotatably connected at the outer end of the pipe coiling wheel, and the air guide pipe is coiled on the pipe coiling wheel.

Furthermore, the positioning assembly comprises a coupling body, a first telescopic fixing rod and a second telescopic fixing rod, wherein a group of first telescopic fixing rods distributed according to an equidistant circumferential array rule are arranged on the coupling body, the middle of an area of the coupling body between any two adjacent first telescopic fixing rods is provided with the second telescopic fixing rod, and the central axis directions of the first telescopic fixing rod and the second telescopic fixing rod are radial directions of the circumferences of the first telescopic fixing rod distribution rules; and the positioning table is provided with an insertion groove matched with the free rod of the second telescopic fixed rod.

Furthermore, the top end of the free rod of the first telescopic fixed rod is rotatably connected with a flexible anti-skidding jacking block, and the rod body of the free rod of the first telescopic fixed rod is also provided with scale marks.

Furthermore, the rod bodies of the fixed rods of the first telescopic rod and the second telescopic rod, which are close to the bottom ends of the fixed rods, are provided with rotating wheels for driving the corresponding free rods to stretch.

Furthermore, the pressure relief pipe and the gun head are arranged on the same side of the gun body, a whistle generator is further arranged at the pipe orifice of the pressure relief pipe, pipe orifices at two ends of the air duct are respectively provided with a pipe head matched with the interface pipe, and a handle is further arranged on the side wall of the gun body, which is different from one side of the gun head.

Furthermore, the type of the processing module is any one of a single chip microcomputer or a PLC, and the type of the power supply module is a lithium battery.

Compared with the prior art, the utility model has the advantages and positive effects that,

1. in the utility model, the gun body and the gun head are arranged on the inflation gun, the surface of the gun body is provided with the display screen, the button module and the charging interface, the accommodating cavity in the gun body is provided with the PCB board and the power module, the PCB board is provided with the processing module and the storage module, the face at one side of the tail end of the gun head is provided with the inflation tube which is vertical to the PCB board, the face at the other side of the tail end of the gun head is provided with the positioning platform which is coaxial with the inflation tube and is matched with the positioning component, the gun body is also provided with the pressure relief tube, the output end of the air compressor and the input end of the gun body are respectively provided with the interface tube which is matched with the air duct, the interface tube, the inflation tube and the pressure relief tube on the inflation gun are mutually communicated, the inside of the interface tube is provided with the air pressure sensor, the electromagnetic valves and the display screen are respectively arranged on the inflation tube and the pressure relief tube, the button module, the interface that charges, power module, baroceptor and the design on the equal electric connection of solenoid valve is to the PCB board. When a user inflates the tire through the inflation gun, the PCB instructs the electromagnetic valve on the inflation tube to be opened and the electromagnetic valve on the pressure relief tube to be closed, monitors the air pressure in the tire in real time through the air pressure sensor, and immediately instructs the electromagnetic valve on the inflation tube to be closed and the electromagnetic valve on the pressure relief tube to be opened when the air pressure in the tire reaches a specified value, so that the user does not need to continuously and pulse-type fill a small amount of gas until the air pressure in the tire reaches the specified value like the traditional mode; meanwhile, the user can light the display screen through the key module to know the real-time detection value of the air pressure sensor. Reach and promoted effectively the utility model discloses convenience and the simplicity effect of product when practical application.

2. The utility model discloses an increase simultaneously with inflatable gun and tire matched with locating component, including the coupling body, the flexible dead lever of first flexible dead lever and second, be equipped with a set of first flexible dead lever according to equidistant circumference array rule distribution on the coupling body, the coupling body is in arbitrary two and only two adjacent first flexible dead levers between regional middle parts is equipped with the flexible dead lever of second, the axis direction of the flexible dead lever of first flexible dead lever and second is the radial of the circumference of first flexible dead lever distribution rule. The positioning table is provided with an inserting groove matched with the free rod of the second telescopic fixing rod, and the top end of the free rod of the first telescopic fixing rod is rotatably connected with a flexible anti-skidding ejector block. The user can firmly fix locating component on the tire through first flexible dead lever (at this moment, the flexible anti-skidding kicking block on first flexible dead lever top all dies with wheel hub's inner ring lateral wall and withstands), then the user blocks the free pole top of the flexible dead lever of second completely with the inserting groove on the location bench, then the user adjusts the length of the flexible dead lever of second and supports until the air cock on gas tube and the tire, thereby make through locating component and keep relative stillness between gas gun and the tire, thereby do not need the user to hand at the inflation in-process and aerify the rifle. The effect of effectively reducing the physical strength consumption of the user is achieved.

Drawings

Fig. 1 is a visual diagram of the present invention mounted on a semitrailer at a first viewing angle;

fig. 2 is an exploded view of the semitrailer from a second perspective of the present invention;

fig. 3 is a visual diagram of the air compressor at a third viewing angle of the present invention;

fig. 4 is a visual diagram of the internal structure of the storage box at the fourth viewing angle of the present invention after the box cover is unscrewed;

FIG. 5 is a pictorial view of the inflation gun at a fifth viewing angle of the present invention;

FIG. 6 is a schematic view of the positioning assembly at a sixth viewing angle of the present invention;

FIG. 7 is a schematic view of the inflatable gun with a partially cut-away view of the gun body at a seventh viewing angle of the present invention;

FIG. 8 is a visual diagram of the utility model after the inflation gun and the positioning assembly are mounted at the eighth viewing angle;

FIG. 9 is an enlarged view of area A of FIG. 4;

the reference numerals in the drawings denote: 1-gas guide tube; 2, an air compressor; 3-inflating the gun; 4-a tractor; 5, a trailer; 6-gun body; 7-gun head; 8-a display screen; 9-a key module; 10-a charging interface; 11-a housing chamber; 12-a PCB board; 13-a power supply module; 14-a processing module; 15-a storage module; 16-a gas-filled tube; 17-a positioning table; 18-a pressure relief tube; 19-a mouthpiece; 20-an electromagnetic valve; 21-a storage box; 22-a first cavity; 23-a second cavity; 24-a third cavity; 25-damping hinge shaft; 26-a box cover; 27-a hasp; 28-pipe coiling wheel; 29-a handle; 30-a linker; 31-a first telescopic fixed rod; 32-a second telescopic fixed rod; 33-a plug groove; 34-a flexible anti-slip top block; 35-a tube head; 36-a wheel; 37-whistle generator; 38-handle.

Detailed Description

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the present invention is not limited to the limitations of the specific embodiments of the present disclosure.

The low-cost portable semitrailer tire emergency inflation system of the embodiment refers to fig. 1-9: comprises an air compressor 2 and an air inflation gun 3 which are detachably connected through an air duct 1 and are in sealed air path connection, and a positioning component which is used for matching between the tire and the air inflation gun 3.

The air compressor 2 is arranged on a vehicle body fixedly arranged between the tractor 4 and the trailer 5, and the air compressor 2 is powered by a vehicle-mounted power supply.

The gas-filling gun 3 comprises a gun body 6 and a gun head 7 which are perpendicular to each other, a display screen 8, a key module 9 and a charging interface 10 are arranged on the surface of the gun body 6, a PCB 12 and a power module 13 are arranged in a containing cavity 11 inside the gun body 6, a processing module 14 and a storage module 15 are arranged on the PCB 12 (wherein the storage module 15 is used for storing corresponding control programs and cache data in the program running process), a gas-filling pipe 16 which is perpendicular to the gas-filling pipe is arranged on the board surface of one side of the tail end of the gun head 7, a positioning table 17 which is coaxial with the gas-filling pipe 16 and matched with a positioning assembly is arranged on the board surface of the other side of the tail end of the gun head 7, and a pressure relief pipe 18 is further arranged on the gun body 6.

The output end of the air compressor 2 and the input end of the gun body 6 are respectively provided with a joint pipe 19 matched with the air guide pipe 1, the joint pipe 19, the inflation pipe 16 and the pressure relief pipe 18 on the inflation gun 3 are mutually communicated (namely, the joint pipe 19, the inflation pipe 16 and the pressure relief pipe 18 essentially form a three-way pipe), the joint pipe 19 is internally provided with an air pressure sensor (wherein the air pressure sensor is used for monitoring the air pressure value inside the tire in real time in the tire inflation process), and the inflation pipe 16 and the pressure relief pipe 18 are respectively provided with an electromagnetic valve 20.

Display screen 8, button module 9, the interface 10 that charges, power module 13, baroceptor and solenoid valve 20 all electrically connected to on PCB board 12.

In the present embodiment, the display screen 8 is an OLED screen because it does not require a backlight, and uses a very thin organic material coating layer and a glass substrate (or a flexible organic substrate), which emit light when a current flows; moreover, the OLED display screen 8 can be made lighter and thinner, the visual angle is larger, and the power consumption can be obviously saved; and the display screen 8 displays contents including, but not limited to, the power of the power module 13, the real-time monitoring value of the air pressure sensor, the on-off state of the solenoid valve 20 on the pressure relief pipe 18, and the on-off state of the solenoid valve 20 on the air charging pipe 16.

In the embodiment, the type of the charging interface 10 is type-c, because it has the advantages of being capable of being plugged in blind and having a fast charging speed.

In the present embodiment, the functions of the key module 9 include, but are not limited to, activating the PCB 12 and setting a threshold value of the tire air pressure, and it should be noted that the term of the threshold value of the tire air pressure here means: when the internal pressure of the tire reaches a preset threshold value during the process of inflating the tire from the inflation tube 16, the processing module 14 immediately commands the solenoid valve 20 on the inflation tube 16 to turn from the open state to the closed state, and simultaneously commands the solenoid valve 20 on the pressure relief tube 18 to turn from the closed state to the open state.

A containing box 21 is fixedly arranged on the vehicle body between the tractor 4 and the trailer 5, the containing box 21 is divided into a first cavity 22, a second cavity 23 and a third cavity 24 by a vertical partition plate, and the first cavity 22, the second cavity 23 and the third cavity 24 are respectively used for storing the air guide tube 1, the inflation gun 3 and the positioning assembly; therefore, the air guide tube 1, the inflation gun 3 and the positioning assembly can be conveniently classified and stored by a user.

A box cover 26 matched with the top of the containing box 21 is rotatably connected to the box opening through a damping hinge shaft 25, and a buckle 27 is arranged on the side wall of the box cover 26; this improves the stability and reliability of the cover 26 covering the top opening of the storage box 21.

A roller tube wheel 28 is rotatably connected to the inside of the first chamber 22, a handle 29 is rotatably connected to the outer end of the roller tube wheel 28, and the air-guiding tube 1 is wound on the roller tube wheel 28, so that the user can rotate the roller tube wheel 28 by holding the handle 29, thereby orderly winding the air-guiding tube 1 on the roller tube wheel 28.

The positioning assembly comprises a connecting body 30, first telescopic fixing rods 31 and second telescopic fixing rods 32, wherein a group of first telescopic fixing rods 31 distributed according to an equidistant circumferential array rule is arranged on the connecting body 30, the middle of an area, between any two adjacent first telescopic fixing rods 31, of the connecting body 30 is provided with the second telescopic fixing rods 32, and the central axis directions of the first telescopic fixing rods 31 and the second telescopic fixing rods 32 are radial directions of the circumferences of the first telescopic fixing rods 31 distributed regularly; thus, the positioning assembly can be reliably fixed on the tire through the first telescopic fixing rod 31.

The positioning table 17 is provided with an inserting groove 33 matched with the free rod of the second telescopic fixing rod 32, so that the stability and reliability of the second telescopic fixing rod 32 when acting on the inflation gun 3 can be ensured.

It should be noted that the number of the first telescopic fixing rods 31 is 3 to 6, and the number of the first telescopic fixing rods 31 is 3 in this embodiment.

The free pole top of first flexible dead lever 31 still rotates and is connected with flexible anti-skidding kicking block 34, and in this embodiment, flexible anti-skidding kicking block 34 adopts rubber materials to make, can further promote the stability and the reliability that locating component fixed on the tire like this, can also reduce the mechanical wear of first flexible dead lever 31 to wheel hub simultaneously.

Scale marks are further arranged on the rod body of the free rod of the first telescopic fixing rod 31, so that a user can easily adjust the three first telescopic fixing rods 31 to the same designated length value, the connecting body 30 is ensured to be positioned at the position of the circle center of the hub, the central axis of the second telescopic rod is ensured to be in the radial direction of the hub, the central axis of the inflation tube 16 is ensured to be in the radial direction of the hub, and the inflation tube 16 can be ensured to be right opposite to the air tap on the tire.

The rod bodies of the fixing rods of the first telescopic rod and the second telescopic rod, which are close to the bottom ends of the fixing rods, are respectively provided with a rotating wheel 36 for driving the corresponding free rod to stretch, wherein the principle that the rotating wheel 36 drives the free rod to stretch is the same as that of a rotating telescopic structure of the lady lipstick in daily life.

The pressure relief pipe 18 and the gun head 7 are arranged on the same side of the gun body 6, and a whistle generator 37 is further arranged at the pipe orifice of the pressure relief pipe 18, so that when the air pressure in the tire reaches a specified value, the PCB 12 instructs the inflation pipe 16 to be closed and the pressure relief pipe 18 to be opened, and the whistle generator 37 on the pressure relief pipe 18 can make a whistle, so that a user is reminded that the tire is inflated, and the user can know whether the tire is inflated or not without looking at the display screen 8.

Tube heads 35 matched with the mouthpiece 19 are arranged at the tube ports at the two ends of the air duct 1, and the mouthpiece 19 is screwed with the tube heads 35.

The side wall of the gun body 6, which is different from the side wall of the gun head 7, is also provided with a grip 38.

The type of the processing module 14 is any one of a single chip microcomputer or a PLC, and in the embodiment, the processing module 14 is the single chip microcomputer, because the single chip microcomputer has the characteristics of complete functions, reliable application, strong anti-interference capability, simplicity, convenience, easiness in embedding, wide application, small volume, high cost performance, strong application flexibility and the like; the power module 13 is a lithium battery because of its advantages of high energy ratio, long service life, low self-discharge rate, light weight, and high adaptability to high and low temperatures.

When in use:

when the air pressure of the tire is insufficient and inflation is required:

in a first step, the user stops the semitrailer in a safe position and shuts it off.

In a second step, the user opens the storage box 21 and removes the air duct 1, the air gun 3 and the positioning assembly.

And thirdly, the user respectively connects the pipe heads 35 at the two ends of the air duct 1 with the air compressor 2 and the mouth-piece 19 on the air inflation in a screw connection mode.

Fourthly, the user adjusts the three first telescopic fixing rods 31 to the same specified length value, so that each first telescopic fixing rod 31 is always dead against the wheel hub, and it is worth noting that at the moment, the central axis of the second telescopic fixing rod 32 is collinear with the central axis of the air faucet on the tire.

Fifthly, the inserting groove 33 on the user positioning table 17 completely blocks the free rod top end of the second telescopic fixing rod 32, and then the user adjusts the length of the second telescopic fixing rod 32 until the inflation tube 16 abuts against the air tap on the tire, so that the inflation gun 3 and the tire are kept relatively still through the positioning assembly.

Sixthly, the user starts the PCB 12 through the key module 9, and sets a threshold value of the tire pressure through the key module 9, at this time, the processing module 14 instructs the solenoid valve 20 on the inflation tube 16 to keep an open state, and the solenoid valve 20 on the pressure relief tube 18 is in a closed state.

Seventh, the user starts the air compressor 2 to inflate the tire; at this time, the processing module 14 monitors whether the air pressure inside the tire reaches the threshold value in real time through the air pressure sensor, when the air pressure inside the tire reaches the threshold value, the processing module 14 immediately instructs the electromagnetic valve 20 on the inflation tube 16 to close, and simultaneously instructs the electromagnetic valve 20 on the pressure relief tube 18 to open, and at this time, the whistle generator 37 on the pressure relief tube 18 sends out a whistle to remind a user that the tire has been inflated.

Step eight, the user closes the air compressor 2 and the PCB 12; the user then sequentially adjusts the second telescoping fixed rod 32 and the first telescoping fixed rod 31 to remove the locating assembly and the inflation gun 3 from the hub.

A ninth step of repeating the fourth to eighth steps to inflate the remaining tires to be inflated; after all the tires are inflated, the user stores the air duct 1, the inflation gun 3 and the positioning assembly in the first cavity 22, the second cavity 23 and the third cavity 24 respectively.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical matters of the present invention will still fall within the protection scope of the technical solution of the present invention.

Claims (8)

1. The utility model provides a low-cost portable semitrailer tire emergency inflation system which characterized in that: comprises an air compressor (2) and an inflation gun (3) which are detachably connected through an air duct (1) and a sealed air path, and a matching positioning component used between a tire and the inflation gun (3);

the air compressor (2) is arranged on a vehicle body fixedly arranged between the tractor (4) and the trailer (5), and the air compressor (2) is powered by a vehicle-mounted power supply;

the air inflation gun (3) comprises a gun body (6) and a gun head (7) which are perpendicular to each other, a display screen (8), a key module (9) and a charging interface (10) are arranged on the surface of the gun body (6), a PCB (printed circuit board) and a power module (13) are arranged in an accommodating cavity (11) in the gun body (6), a processing module (14) and a storage module (15) are arranged on the PCB (12), an air inflation tube (16) perpendicular to the air inflation tube is arranged on the surface of one side of the tail end of the gun head (7), a positioning table (17) which is coaxial with the air inflation tube (16) and matched with a positioning assembly is arranged on the surface of the other side of the tail end of the gun head (7), and a pressure relief tube (18) is further arranged on the gun body (6);

the output end of the air compressor (2) and the input end of the gun body (6) are respectively provided with a connector tube (19) matched with the air guide tube (1), the connector tube (19), the inflation tube (16) and the pressure relief tube (18) on the inflation gun (3) are communicated with one another, an air pressure sensor is arranged inside the connector tube (19), and the inflation tube (16) and the pressure relief tube (18) are respectively provided with an electromagnetic valve (20);

the display screen (8), the key module (9), the charging interface (10), the power module (13), the air pressure sensor and the electromagnetic valve (20) are all electrically connected to the PCB (12).

2. The low-cost portable semitrailer tire emergency inflation system according to claim 1, characterized in that a storage box (21) is further fixedly arranged on the vehicle body between the tractor (4) and the trailer (5), the interior of the storage box (21) is divided into a first cavity (22), a second cavity (23) and a third cavity (24) through vertical partition plates, the first cavity (22), the second cavity (23) and the third cavity (24) are respectively provided with an air duct (1), an inflation gun (3) and a positioning assembly, a box opening at the top of the storage box (21) is rotatably connected with a box cover (26) matched with the storage box through a damping hinge shaft (25), and a hasp (27) is arranged on the side wall of the box cover (26).

3. A low-cost portable semitrailer tire emergency inflation system as claimed in claim 2, characterized in that a roller tube wheel (28) is rotatably connected inside the first cavity (22), the outer end of the roller tube wheel (28) is rotatably connected with a handle (29) matched with the roller tube wheel, and the air duct (1) is wound on the roller tube wheel (28).

4. The low-cost portable semitrailer tire emergency inflation system as claimed in claim 1, wherein the positioning assembly comprises a coupling body (30), first telescopic fixing rods (31) and second telescopic fixing rods (32), a group of first telescopic fixing rods (31) which are regularly distributed in an equidistant circumferential array is arranged on the coupling body (30), the second telescopic fixing rods (32) are arranged in the middle of the area between any two adjacent first telescopic fixing rods (31) of the coupling body (30), and the central axis directions of the first telescopic fixing rods (31) and the second telescopic fixing rods (32) are radial directions of the circumferences in which the first telescopic fixing rods (31) are regularly distributed; and the positioning table (17) is provided with an insertion groove (33) matched with the free rod of the second telescopic fixing rod (32).

5. The low-cost portable semitrailer tire emergency inflation system as claimed in claim 4, wherein the top end of the free rod of the first telescopic fixing rod (31) is further rotatably connected with a flexible anti-skid top block (34), and the rod body of the free rod of the first telescopic fixing rod (31) is further provided with scale marks.

6. A low-cost portable semitrailer tire emergency inflation system as claimed in claim 4, wherein the rod bodies of the fixed rods of the first and second telescopic fixed rods near the bottom ends thereof are each provided with a rotating wheel (36) for driving the corresponding free rod to telescope.

7. The low-cost portable semitrailer tire emergency inflation system according to claim 1, characterized in that the pressure relief tube (18) and the gun head (7) are arranged on the same side of the gun body (6), a whistle generator (37) is further arranged at the tube opening of the pressure relief tube (18), tube openings at two ends of the air duct (1) are respectively provided with a tube head (35) matched with the interface tube (19), and a grip (38) is further arranged on the side wall of the gun body (6) different from one side of the gun head (7).

8. The low-cost portable semitrailer tire emergency inflation system as claimed in claim 1, wherein the processing module (14) is of any one of a single chip microcomputer or a PLC, and the power supply module (13) is of a lithium battery.

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