An explosive gas detection device

Abstract

The application belongs to the technical field of gas detection, and particularly relates to an explosive gas detection device, which comprises four half ring plates and a pipeline for conveying hydrogen. The two half ring plates on the same side are hingedly arranged. The two half ring plates on the same side are clamped on the outer side of the pipeline. The upper and lower sides of the pipeline are respectively provided with upper and lower mounting plates. The outer side wall of each half ring plate is fixedly provided with a T-shaped sliding block at one end. The end surface of the upper and lower mounting plates is provided with a T-shaped sliding groove matched with the T-shaped sliding block. The application can not only increase the detection range of hydrogen leakage, but also automatically locate the hydrogen leakage point and improve the accuracy of hydrogen leakage detection. Meanwhile, the leaked hydrogen can be temporarily plugged and stored, so that the personnel can have time to deal with the leaked hydrogen, and the production safety of hydrogen is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas detection, and particularly relates to an explosive gas detection device. BACKGROUND

[0002] Hydrogen is a gas which is extremely flammable, colorless, odorless and difficult to dissolve in water. Since hydrogen is flammable and explosive, hydrogen needs to be detected during the production and transportation of hydrogen to ensure timely hydrogen leakage and reduce the possibility of safety accidents.

[0003] At present, hydrogen detection sensors and other instruments are the most common hydrogen detection devices, which are generally installed at each docking port of the water pipeline and at the ventilation hole in the workshop. Since hydrogen leakage is more likely to occur at the docking port, detection at the docking port can timely discover hydrogen leakage. The ventilation hole is the air circulation place of the whole space, so that hydrogen leakage can be timely discovered after leakage occurs at a certain place of the pipeline (not at the docking port of the pipeline).

[0004] However, the fixed-position detection method has a limited detection coverage. During the production of hydrogen, water vapor and the like are often accompanied. During the long-term use of the pipeline, corrosion points are prone to occur. Under the high-pressure transportation state, in combination with the high penetration of hydrogen itself, the hydrogen pipeline has the possibility of micro-hole leakage at the pipeline body in addition to the docking port. Since the hydrogen molecule is small and has a high diffusion speed, the detection instrument at the docking port is not easy to detect hydrogen leakage at the pipeline body. When the hydrogen leaks through the micro-hole, the amount of hydrogen escaping is small, and under the action of the high air flow at the ventilation hole, the detection instrument is not easy to detect hydrogen leakage. Moreover, it is not conducive to the positioning of the point leakage, which brings certain difficulties to timely repair. SUMMARY

[0005] The application aims at the above problems and provides an explosive gas detection device.

[0006] In order to achieve the above object, the application adopts the following technical scheme: an explosive gas detection device, comprising four half-ring plates and a pipeline for conveying hydrogen, two half-ring plates on the same side are hingedly arranged, two half-ring plates on the same side are clamped on the outer side of the pipeline, the upper and lower sides of the pipeline are respectively provided with upper and lower mounting plates, the outer side wall of each half-ring plate is fixedly provided with a T-shaped sliding block at one end, and the end surface of the upper and lower mounting plates is provided with a T-shaped sliding groove matched with the T-shaped sliding block, the end surface of the upper mounting plate is provided with a gas supply mechanism, the gas inlet end of the gas supply mechanism is provided with a separation detection mechanism, the inner wall of the two half-ring plates on the same side is fixedly connected with a ring-shaped air bag sleeve at both ends, the gas supply mechanism and each half-ring plate are provided with a shunt assembly in communication with each ring-shaped air bag sleeve, four half-ring plates are provided with an alternate walking mechanism, and the inner wall of two parallel half-ring plates is provided with a gas pressure detection mechanism, the end surface of the upper mounting plate is provided with a gas storage prompting mechanism matched with the gas supply mechanism on both sides, and the lower end of the lower mounting plate is fixedly provided with a controller and a battery assembly.

[0007] Preferably, the gas supply mechanism comprises a protrusion integrally formed on the end surface of the upper mounting plate, the end surface of the protrusion is fixedly provided with a gas pump, the output end of the gas pump is fixedly provided with a gas conveying pipe, the gas inlet end of the gas pump is fixedly communicated with a gas suction pipe, and the gas pump is electrically connected with the controller.

[0008] Preferably, the separation detection mechanism comprises a spherical ball arranged above the gas pump, the spherical ball is hollow, a support rod is fixedly arranged between the spherical ball and the protrusion, a spherical insulating framework is arranged in the spherical ball, a polytetrafluoroethylene selective permeation membrane is fixedly wrapped on the outer side wall of the spherical insulating framework, a columnar tin oxide is fixedly arranged in the spherical insulating framework, a first electromagnetic switch and a buzzer are fixedly arranged on the lower mounting plate, the first electromagnetic switch is electrically connected with the columnar tin oxide through the controller, the buzzer is electrically connected with the first electromagnetic switch through the controller, the upper end of the spherical ball is open, and an inner convex air baffle ring is integrally formed on the inner wall of the spherical ball.

[0009] Preferably, the shunt assembly comprises a shunt cavity opened in the inner part of the protrusion, and the shunt cavity is fixedly and communicatively connected with the gas conveying pipe, both cavity walls of the shunt cavity are fixedly and pluggably connected with shunt pipes, the interiors of both shunt pipes are installed with first normally closed electromagnetic valves, both ends of the inner walls of the two half ring plates on the same side are commonly and openingly connected with annular grooves which are in communication with the annular air bag sleeve, and both annular grooves on the same side are commonly and fixedly and pluggably connected with a communication pipe, the pipe ends of both shunt pipes are commonly and fixedly and communicatively connected with hoses corresponding to the annular grooves, the interior of the gas conveying pipe is installed with a second normally closed electromagnetic valve, both first normally closed electromagnetic valves and the second normally closed electromagnetic valve are electrically connected with the controller, the side walls of both annular grooves are fixedly and pluggably connected with circular pipes, and the interiors of both circular pipes are installed with third normally closed electromagnetic valves.

[0010] Preferably, the alternate walking mechanism comprises two walking wheels fixedly arranged on the inner walls of the half ring plates, and the two walking wheels on the same side are symmetrically arranged, the wheel walls of the walking wheels are abuttingly arranged with the outer pipe walls of the pipes, the side walls of both half ring plates hingedly connected are fixedly and pluggably connected with electric push rods, the output ends of both electric push rods are fixedly connected with the side walls of the corresponding half ring plates, both electric push rods are electrically connected with the controller, and the side walls on the opposite sides of both half ring plates are fixedly connected with side jacks, and the end portions of both side jacks are installed with travel switches electrically connected with the controller.

[0011] Preferably, both gas pressure detection mechanisms comprise mounting grooves opened in the inner walls of the half ring plates, and the mounting grooves are arranged between the annular air bag sleeves on the same side, the groove bottoms of the mounting grooves are fixedly installed with gas pressure automatic switches, and the groove openings of the mounting grooves are fixedly encapsulated with elastic membranes, both gas pressure automatic switches are electrically connected with the buzzer through the controller.

[0012] Preferably, both gas storage prompting mechanisms comprise storage barrels fixedly installed on the end faces of the upper mounting plates, the inner bottoms of the storage barrels are fixedly installed with safety air bags, the side walls of the storage barrels and the pipe walls of the gas conveying pipes are commonly and fixedly and pluggably connected with exhaust pipes, the exhaust pipes are arranged above the second normally closed electromagnetic valves, the interiors of the exhaust pipes are installed with first normally open electromagnetic valves, the exhaust pipes are in communication with the safety air bags, the side walls of the safety air bags and the side walls of the storage barrels are commonly and fixedly and pluggably connected with tail gas pipes, the interiors of the tail gas pipes are installed with second normally open electromagnetic valves, the end faces of the lower mounting plates are installed with second electromagnetic switches electrically connected with the columnar tin oxide, and the second electromagnetic switches are electrically connected with the first normally open electromagnetic valve and the second normally open electromagnetic valve through the controller.

[0013] Preferably, the opening of the spherical ball is fixedly and pluggably connected with an air inlet pipe, the pipe end of the air inlet pipe is fixedly and communicatively connected with a hollow circular plate, and the side wall of the hollow circular plate is opened with a plurality of air suction holes.

[0014] The lower end of the side wall of each of the two air bags is preferably fixedly inserted with an air pressure pipe, and the inside of each of the two air pressure pipes is installed with an air pressure valve.

[0015] Compared with the prior art, the explosive gas detection device has the advantages that:

[0016] 1. The mutual cooperation of the four half ring plates, the upper mounting plate, the lower mounting plate, the T-shaped sliding block, the T-shaped sliding groove, the gas supply mechanism, the annular air bag sleeve, the shunt assembly, the controller, the battery assembly and the walking mechanism can make the entire detection device walk on the pipeline conveying hydrogen, achieve the purpose of inspection, improve the detection coverage range, and the cooperatively arranged air pressure detection mechanism can detect the hydrogen leakage point during the inspection process, not only can detect and position the hydrogen leakage point, but also can temporarily block the hydrogen leakage point, thereby improving the safety of hydrogen production.

[0017] 2. The separation detection mechanism can detect the hydrogen that has escaped at the air inlet end of the gas supply mechanism, and can reduce the influence of air on hydrogen detection based on the small molecular characteristics of hydrogen, thereby improving the hydrogen concentration at the detection element, increasing the accuracy of hydrogen detection, and reducing the possibility that the leakage is not discovered in time due to the high diffusivity of hydrogen.

[0018] 3. The gas storage prompting mechanism can automatically temporarily store hydrogen when detecting hydrogen leakage based on the detection result of the separation detection mechanism, thereby giving the staff time to handle the safety hazard in time, and the staff can be prompted about the hydrogen leakage state through the inflation state of the safety air bag, thereby improving the warning effect in cooperation with the buzzer. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structure schematic view of an explosive gas detection device provided by the application;

[0020] Figure 2 is a side view structure schematic view of an explosive gas detection device provided by the application;

[0021] Figure 3 is a connection structure schematic view of a gas pump and an upper mounting plate of an explosive gas detection device provided by the application;

[0022] Figure 4 is a schematic view of the internal structure of a ball of an explosive gas detection device provided by the application;

[0023] Figure 5 is a schematic view of the internal structure of a ball of an explosive gas detection device provided by the application;

[0024] Figure 6It is the internal structure schematic view of the storage barrel of the explosive gas detection device provided by the application;

[0025] Figure 7 It is the connection structure schematic view of the lower mounting plate and the half ring plate of the explosive gas detection device provided by the application.

[0026] In the figure: 1 half ring plate, 2 pipeline, 3 upper mounting plate, 4 lower mounting plate, 5 T-shaped sliding block, 6 T-shaped sliding groove, 7 gas supply mechanism, 71 protruding block, 72 air pump, 73 gas conveying pipe, 74 air suction pipe, 8 separation and detection mechanism, 81 ball, 82 support rod, 83 spherical insulating framework, 84 polytetrafluoroethylene selective permeation membrane, 85 columnar tin oxide, 86 first electromagnetic switch, 87 buzzer, 88 inner protruding gas blocking ring, 9 annular airbag cover, 10 shunt assembly, 101 shunt cavity, 102 shunt pipe, 103 first normally closed electromagnetic valve, 104 annular groove, 105 communication pipe, 106 hose, 107 second normally closed electromagnetic valve, 108 circular pipe, 109 third normally closed electromagnetic valve, 11 alternate walking mechanism, 111 walking wheel, 112 electric push rod, 113 side top column, 114 travel switch, 12 air pressure detection mechanism, 121 mounting groove, 122 air pressure automatic switch, 123 elastic film, 13 gas storage prompting mechanism, 131 storage barrel, 132 safety airbag, 133 exhaust pipe, 134 first normally open electromagnetic valve, 135 tail gas pipe, 136 second normally open electromagnetic valve, 137 second electromagnetic switch, 14 controller, 15 battery assembly, 16 air inlet pipe, 17 hollow circular plate, 18 air suction hole, 19 air pressure pipe, 20 air pressure valve. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application.

[0028] As Figures 1-7As shown, an explosive gas detection device, including four half ring plate 1 and for conveying hydrogen pipeline 2, same side two half ring plate 1 is hinged to each other, the same side two half ring plate 1 is clamped in the outer side of pipeline 2, the movable end of the same side two half ring plate 1 is locked and fixed by bolt, the upper and lower sides of pipeline 2 are respectively provided with upper mounting plate 3 and lower mounting plate 4, the outer side wall of each half ring plate 1 is fixedly installed with T-shaped sliding block 5, and the end surface of upper mounting plate 3 and lower mounting plate 4 is provided with T-shaped sliding slot 6 matched with T-shaped sliding block 5, the lower end of lower mounting plate 4 is fixedly installed with controller 14 and battery assembly 15, the end surface of upper mounting plate 3 is installed with gas supply mechanism 7, gas supply mechanism 7 includes protrusion 71 integrally formed on the end surface of upper mounting plate 3, the end surface of protrusion 71 is fixedly installed with air pump 72, the output end of air pump 72 is fixedly installed with gas conveying pipe 73, the air suction end of air pump 72 is fixedly communicated with air suction pipe 74, air pump 72 is electrically connected with controller 14, air pump 72 can suck air through air suction pipe 74 and output through gas conveying pipe 73.

[0029] The air inlet end of gas supply mechanism 7 is installed with separation detection mechanism 8, separation detection mechanism 8 includes spherical ball 81 arranged above air pump 72, spherical ball 81 is hollow, support rod 82 is fixedly installed between spherical ball 81 and protrusion 71, spherical insulating framework 83 is installed in the inside of spherical ball 81, polytetrafluoroethylene selective permeation membrane 84 is fixedly wrapped on the outer side wall of spherical insulating framework 83, cylindrical tin oxide 85 is fixedly installed in the inside of spherical insulating framework 83, first electromagnetic switch 86 and buzzer 87 are fixedly installed on lower mounting plate 4, first electromagnetic switch 86 is electrically connected with cylindrical tin oxide 85 through controller 14, buzzer 87 is electrically connected with first electromagnetic switch 86 through controller 14, the upper end of spherical ball 81 is arranged as an opening, inner convex air baffle ring 88 is integrally formed on the inner wall of spherical ball 81, hydrogen can easily pass through polytetrafluoroethylene selective permeation membrane 84 on spherical insulating framework 83, because the molecules of each component of air are large, and the particle size of water vapor, dust and other particles in air is large, they are not easy to pass through polytetrafluoroethylene selective permeation membrane 84, so when air passes through inner convex air baffle ring 88, the gap between inner convex air baffle ring 88 and polytetrafluoroethylene selective permeation membrane 84 becomes smaller, at this time, if the air contains leaked hydrogen, hydrogen will easily enter the inside of polytetrafluoroethylene selective permeation membrane 84.

[0030] The opening of spherical ball 81 is fixedly inserted with air inlet pipe 16, the pipe end of air inlet pipe 16 is fixedly communicated with hollow circular plate 17, a plurality of air suction holes 18 are formed in the side wall of hollow circular plate 17, through the plurality of air suction holes 18 on the upper end of hollow circular plate 17, the air inlet end of spherical ball 81 can be inhaled from multiple directions at a high place, and in the process of inspection, the leaked hydrogen can be captured in time.

[0031] The inner wall of the two half ring plates 1 on the same side is fixedly connected with a ring-shaped air bag sleeve 9 at both ends, the air supply mechanism 7 is jointly installed with a shunt assembly 10 which is in communication with each ring-shaped air bag sleeve 9, the shunt assembly 10 includes a shunt cavity 101 which is opened in the inside of the protrusion 71, and the shunt cavity 101 is fixedly and communicatively arranged with the gas conveying pipe 73, both cavity walls of the shunt cavity 101 are fixedly inserted with shunt pipes 102, the inside of both shunt pipes 102 is installed with a first normally closed electromagnetic valve 103, the inner wall of the two half ring plates 1 on the same side is jointly provided with a ring-shaped groove 104 which is in communication with the ring-shaped air bag sleeve 9 at both ends, and the two ring-shaped grooves 104 on the same side are fixedly inserted with a communication pipe 105, the pipe end of both shunt pipes 102 is fixedly and communicatively arranged with a hose 106 corresponding to the ring-shaped groove 104, the inside of the gas conveying pipe 73 is installed with a second normally closed electromagnetic valve 107, both the first normally closed electromagnetic valve 103 and the second normally closed electromagnetic valve 107 are electrically connected with the controller 14, the side wall of both ring-shaped grooves 104 is fixedly inserted with a circular pipe 108, and the inside of both circular pipes 108 is installed with a third normally closed electromagnetic valve 109, the circular pipe 108 is used for discharging air in the ring-shaped groove 104, after the excess air in the ring-shaped groove 104 is discharged, the ring-shaped air bag sleeve 9 can be retracted and reset, under the action of the hose 106, the hose 106 will not affect the walking of the two half ring plates 1.

[0032] The four half ring plates 1 are jointly installed with an alternate walking mechanism 11, the alternate walking mechanism 11 includes two walking wheels 111 which are fixedly arranged on the inner wall of each half ring plate 1, and the two walking wheels 111 on the same side are symmetrically arranged, the wheel wall of each walking wheel 111 is in abutting arrangement with the outer pipe wall of the pipeline 2, the side wall of both half ring plates 1 which are hingedly connected is fixedly inserted with an electric push rod 112, and the output end of both electric push rods 112 is fixedly connected with the side wall of the corresponding half ring plate 1, both electric push rods 112 are electrically connected with the controller 14, the side wall of the opposite side of both half ring plates 1 which are in parallel is fixedly connected with a side top column 113, and the end part of both side top columns 113 is installed with a travel switch 114 which is electrically connected with the controller 14, after the travel switch 114 on one side is triggered, the controller 14 will control the half ring plate 1 to move to the other side.

[0033] The inner wall of the two juxtaposed half ring plates 1 is provided with a gas pressure detection mechanism 12, the gas pressure detection mechanism 12 comprises a mounting groove 121 provided in the inner wall of the half ring plate 1, the mounting groove 121 is arranged between the same side annular air bag sleeves 9, the groove bottom of the mounting groove 121 is fixedly provided with a gas pressure automatic switch 122, and the slot of the mounting groove 121 is fixedly provided with an elastic film 123, the two gas pressure automatic switches 122 are electrically connected with the buzzer 87 through the controller 14, the movable contact of the gas pressure automatic switch 122 is closed under the action of the gas pressure, and the movable contact of the gas pressure automatic switch 122 can be reset under the action of the elastic element thereof after the gas pressure disappears, which is a mature technology and will not be repeated here.

[0034] The end surface of the upper mounting plate 3 is provided with a gas storage prompt mechanism 13 matched with the gas supply mechanism 7, the gas storage prompt mechanism 13 comprises a storage barrel 131 fixedly installed on the end surface of the upper mounting plate 3, the inner bottom of the storage barrel 131 is fixedly provided with a safety air bag 132, the side wall of the storage barrel 131 and the pipe wall of the gas conveying pipe 73 are jointly and fixedly provided with an exhaust pipe 133, the exhaust pipe 133 is arranged above the second normally closed electromagnetic valve 107, the inside of the exhaust pipe 133 is provided with a first normally open electromagnetic valve 134, the exhaust pipe 133 and the safety air bag 132 are in communication, the side wall of the safety air bag 132 and the side wall of the storage barrel 131 are jointly and fixedly provided with a tail gas pipe 135, the inside of the tail gas pipe 135 is provided with a second normally open electromagnetic valve 136, the end surface of the lower mounting plate 4 is provided with a second electromagnetic switch 137 electrically connected with the columnar tin oxide 85, the second electromagnetic switch 137 is electrically connected with the first normally open electromagnetic valve 134 and the second normally open electromagnetic valve 136 through the controller 14, the second electromagnetic switch 137 needs a larger current to attract its movable contact compared with the first electromagnetic switch 86, the safety air bag 132 is used for temporarily storing hydrogen when the hydrogen concentration is high, and when the hydrogen concentration is low, hydrogen can be directly discharged through the tail gas pipe 135, because the concentration is low, it will not cause explosion and other dangers, the outer surface of the safety air bag 132 is coated with fluorescent paint (or colored paint), and is bonded with a reflective sticker (not shown in the figure), which is used for identifying the position of the safety air bag 132 in a dim light.

[0035] The side wall of the two safety air bags 132 is fixedly provided with a gas pressure pipe 19, and the inside of the two gas pressure pipes 19 is provided with a gas pressure valve 20, through the gas pressure valve 20 in the inside of the gas pressure pipe 19, the excess gas can be discharged after enough gas is filled in the inside of the safety air bag 132, and because hydrogen is lighter, hydrogen will be located on the upper side of the safety air bag 132 compared with air, so when the gas pressure valve 20 is opened, the air on the lower side will be discharged first, so as to reduce the leakage of hydrogen as much as possible.

[0036] The operation principle of the present application is described as follows: four half ring plates 1 are sleeved on the right end of the pipeline 2 outside, and the movable ends of two half ring plates 1 on the same side are locked and fixed, then the controller 14 is started;

[0037] After the controller 14 is started, the air pump 72 starts to work, and the second normally closed electromagnetic valve 107 in the gas conveying pipe 73, the first normally open electromagnetic valve 134 in the two exhaust pipes 133 and the first normally closed electromagnetic valve 103 in the two shunt pipes 102 are synchronously controlled to work, at this time, the air conveyed by the air pump 72 enters the shunt cavity 101 through the gas conveying pipe 73, then the air enters the corresponding annular groove 104 through the two shunt pipes 102 and the hose 106, and through the communication pipe 105, the air in each annular groove 104 is filled, and the filled air can make each annular air bag sleeve 9 expand and abut against the outer wall of the pipeline 2, the second normally closed electromagnetic valve 107, the two first normally open electromagnetic valves 134 and the two first normally closed electromagnetic valves 103 are controlled by the controller 14 to work for 5 seconds and then are powered off, at this time, the air conveyed by the air pump 72 enters the two exhaust pipes 133, then the air passes through the safety air bag 132 on both sides and is discharged through the tail gas pipe 135, and if there is a hydrogen leakage point between the two annular air bag sleeves 9 on the same side of the pipeline 2, the leaked hydrogen will quickly fill the space between the two annular air bag sleeves 9, so that the pressure in the space surrounded by the two annular air bag sleeves 9, the pipeline 2 and the two half ring plates 1 on the same side is larger, so that the elastic film 123 expands, so that the pressure in the mounting groove 121 increases, under the action of the gas pressure, the movable contact of the gas pressure automatic switch 122 is closed, at this time, the connection circuit of the controller 14 and the buzzer 87 is connected, so that the buzzer 87 starts to work and prompts, and under the action of the abutment and sealing of the two annular air bag sleeves 9 and the outer wall of the pipeline 2, the hydrogen leakage point can be temporarily plugged, and the hydrogen leakage is reduced;

[0038] When the air pump 72 is working, the suction end of the air pump 72 can suck external air through the air suction pipe 74, the air inlet pipe 16 on the ball 81, the hollow circular plate 17 on the air inlet pipe 16, and the air suction hole 18. Since the hydrogen molecules are small (about 0.289 nanometers), the hydrogen in the air entering the ball 81 can easily pass through the polytetrafluoroethylene selective permeation membrane 84 on the spherical insulating framework 83. Since the molecules of the components of the air are large, and the particle size of the water vapor and dust in the air is large, they are not easy to pass through the polytetrafluoroethylene selective permeation membrane 84. Therefore, when the air passes through the inner convex air blocking ring 88, the gap between the inner convex air blocking ring 88 and the polytetrafluoroethylene selective permeation membrane 84 becomes smaller. At this time, if the air contains leaked hydrogen, the hydrogen will easily enter the polytetrafluoroethylene selective permeation membrane 84. Under normal conditions, there are oxygen vacancies in the crystal lattice of the columnar tin oxide 85, which hinders electron conduction, so the resistance is high. When the hydrogen entering the polytetrafluoroethylene selective permeation membrane 84 contacts the columnar tin oxide 85, the hydrogen will react with the oxygen vacancies and form water vapor, which will reduce the oxygen vacancies and improve the conductivity of the columnar tin oxide 85. The higher the hydrogen concentration, the lower the resistance of the columnar tin oxide 85. When the resistance of the columnar tin oxide 85 decreases significantly, the resistance in the connection circuit of the columnar tin oxide 85, the first electromagnetic switch 86, and the controller 14 becomes lower. At this time, the current flowing into the first electromagnetic switch 86 is larger, so the moving contact of the first electromagnetic switch 86 is magnetically attracted and closed. At this time, the connection circuit between the buzzer 87 and the controller 14 is avoided, so the buzzer 87 can emit a buzzing sound to prompt;

[0039] At the same time, if the hydrogen concentration is high, the resistance of the columnar tin oxide 85 will decrease significantly. At this time, the current flowing into the second electromagnetic switch 137 is sufficient to attract the moving contact of the second electromagnetic switch 137, so the second normally open electromagnetic valve 136 in the two tail gas pipes 135 is energized. At this time, the air discharged into the safety airbag 132 through the exhaust pipe 133 cannot be discharged in time through the tail gas pipe 135, so the gas in the safety airbag 132 increases, and under the action of air pressure, the safety airbag 132 can expand and expand to the outside of the storage barrel 131. In cooperation with the fluorescent paint on the surface of the safety airbag 132, the colored pigment box reflective sticker, etc., it can be convenient for personnel to see the safety airbag 132 in dim light. When personnel see the safety airbag 132 expanding, they can know that the concentration of the leaked hydrogen is high, so they can take appropriate treatment measures in time. The safety airbag 132 can temporarily store the leaked hydrogen, improving the safety effect;

[0040] Simultaneously, the controller 14 controls the second normally closed electromagnetic valve 107, two first normally open electromagnetic valves 134 and two first normally closed electromagnetic valves 103 to work for 5 seconds, and then to be powered off, so that the half ring plate 1 stays on the pipeline 2 for 20 seconds. When no hydrogen leakage is detected, the controller 14 controls the third normally closed electromagnetic valve 109 inside the circular tube 108 away from the right end of the pipeline 2 to be powered on for 3 seconds, at this time, the air in the two annular grooves 104 on this side cooperates with the communication pipe 105 to be discharged through the circular tube 108, and the annular air bag sleeve 9 is retracted under the elastic force of itself to recover and separate from the pipeline 2. Subsequently, the controller 14 controls the two electric push rods 112 to output for 1 second, at this time, the two half ring plates 1 away from the pipeline 2 are pushed out by a fixed distance. Subsequently, the controller 14 controls the second normally closed electromagnetic valve 107 inside the gas supply pipe 73, the first normally open electromagnetic valve 134 inside the two exhaust pipes 133, and the first normally closed electromagnetic valve 103 inside the two shunt pipes 102 to be powered on for 2.5 seconds, at this time, the annular air bag sleeve 9 on the two half ring plates 1 that are pushed out is recharged with air, so that the annular air bag sleeve 9 is re-inflated and abuts against the outer wall of the pipeline 2. Then, the controller 14 controls the third normally closed electromagnetic valve 109 inside the circular tube 108 close to the right end of the pipeline 2 to be powered on for 3 seconds, at this time, the air in the two annular grooves 104 on this side cooperates with the communication pipe 105 to be discharged through the circular tube 108. Subsequently, the controller 14 controls the two electric push rods 112 to retract for 1 second. Since the annular air bag sleeve 9 on the two half ring plates 1 that are pushed out abuts against the pipeline 2, the two half ring plates 1 on this side can be fixed, so that when the electric push rod 112 retracts, the other two half ring plates 1 can be pulled and moved by a fixed distance. Subsequently, the controller 14 controls the second normally closed electromagnetic valve 107 inside the gas supply pipe 73, the first normally open electromagnetic valve 134 inside the two exhaust pipes 133, and the first normally closed electromagnetic valve 103 inside the two shunt pipes 102 to be powered on for 2.5 seconds, so that the two annular air bag sleeves 9 can abut against the outer wall of the pipeline 2. The controller 14 controls the two electric push rods 112 to output for 1 second, at this time, the two half ring plates 1 that are pulled and moved by a fixed distance are pushed out by a fixed distance. Subsequently, the controller 14 controls the second normally closed electromagnetic valve 107 inside the gas supply pipe 73, the first normally open electromagnetic valve 134 inside the two exhaust pipes 133, and the first normally closed electromagnetic valve 103 inside the two shunt pipes 102 to be powered on for 2.5 seconds, so that the two annular air bag sleeves 9 can abut against the outer wall of the pipeline 2.5 seconds later, the second normally closed solenoid valve 107 inside the gas supply pipe 73, the first normally open solenoid valve 134 inside the two exhaust pipes 133, and the first normally closed solenoid valve 103 inside the two shunt pipes 102 are de-energized, and the new position of the pipe 2 is detected. If no hydrogen is detected within 20 seconds of detection, the controller 14 controls the half ring plate 1 to continue moving to the next position of the pipe 2 for detection. If hydrogen leakage is detected during the process, the movement of the half ring plate 1 is stopped, and the third normally closed solenoid valve 109 inside the circular pipe 108 is not controlled to work. When the half ring plate 1 moves from the right end of the pipe 2 to the left end of the pipe 2, the travel switch 114 on the side top column 113 on the left half ring plate 1 will hit the side wall of the mounting flange at the left end of the pipe 2. At this time, the moving contact of the travel switch 114 will close under the impact and extrusion, and a certain electrical signal will be given to the controller 14 after the moving contact of the travel switch 114 is closed. The controller 14 then controls the third normally closed solenoid valve 109 inside the two circular pipes 108 to be energized and work. At this time, the air inside the two annular air bag sleeves 9 is completely discharged, and after 3 seconds, the controller 14 controls the second normally closed solenoid valve 107 inside the gas supply pipe 73, the first normally open solenoid valve 134 inside the two exhaust pipes 133, and the first normally closed solenoid valve 103 inside the left shunt pipe 102 to be energized and work for 2.5 seconds. Then, the controller 14 starts the electric push rod 112 to retract for 1 second. At this time, the entire device starts to perform the return cruise work on the pipe 2 until the right travel switch 114 is triggered.

[0041] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An explosive gas detection device comprising four semi-ring plates (1) and a pipe (2) for transporting hydrogen, characterized in that, The two half ring plates (1) are hingedly arranged on the same side, and the two half ring plates (1) are clamped on the outer side of the pipeline (2). The upper and lower sides of the pipeline (2) are respectively provided with an upper mounting plate (3) and a lower mounting plate (4). The outer side wall of each half ring plate (1) is fixedly provided with a T-shaped sliding block (5) at one end, and the end surface of the upper mounting plate (3) and the lower mounting plate (4) is provided with a T-shaped sliding groove (6) matched with the T-shaped sliding block (5). The end surface of the upper mounting plate (3) is provided with a gas supply mechanism (7). The gas inlet end of the gas supply mechanism (7) is provided with a separation detection mechanism (8). The inner walls of the two half ring plates (1) are fixedly connected with a ring-shaped air bag sleeve (9) at both ends. The gas supply mechanism (7) and each half ring plate (1) are provided with a shunt assembly (10) in communication with each ring-shaped air bag sleeve (9). Four half ring plates (1) are provided with an alternate walking mechanism (11), and the inner walls of two parallel half ring plates (1) are provided with a gas pressure detection mechanism (12). The end surface of the upper mounting plate (3) is provided with a gas storage prompting mechanism (13) matched with the gas supply mechanism (7). The lower end of the lower mounting plate (4) is fixedly provided with a controller (14) and a battery assembly (15). The gas supply mechanism (7) comprises a protrusion (71) integrally formed on the end surface of the upper mounting plate (3). The end surface of the protrusion (71) is fixedly provided with a gas pump (72). The output end of the gas pump (72) is fixedly provided with a gas conveying pipe (73). The gas suction end of the gas pump (72) is fixedly communicated with a gas suction pipe (74). The gas pump (72) is electrically connected with the controller (14). The two gas storage prompting mechanisms (13) each comprise a storage barrel (131) fixedly provided on the end surface of the upper mounting plate (3). The inner bottom of the storage barrel (131) is fixedly provided with a safety air bag (132). The side wall of the storage barrel (131) and the pipe wall of the gas conveying pipe (73) are fixedly inserted with an exhaust pipe (133), and the first normally open electromagnetic valve (134) is installed in the exhaust pipe (133). The exhaust pipe (133) is in communication with the safety air bag (132). The side wall of the safety air bag (132) and the side wall of the storage barrel (131) are fixedly inserted with a tail gas pipe (135), and the second normally open electromagnetic valve (136) is installed in the tail gas pipe (135). The end surface of the lower mounting plate (4) is provided with a second electromagnetic switch (137), and the second electromagnetic switch (137) is electrically connected with the first normally open electromagnetic valve (134) and the second normally open electromagnetic valve (136) through the controller (14). The separation detection mechanism (8) comprises a hollow ball (81) arranged above the air pump (72), a support rod (82) is fixedly arranged between the ball (81) and the protrusion (71), a spherical insulating framework (83) is arranged in the ball (81), a polytetrafluoroethylene selective permeation membrane (84) is wrapped on the outer wall of the spherical insulating framework (83), a cylindrical tin oxide (85) is fixedly arranged in the spherical insulating framework (83), a first electromagnetic switch (86) and a buzzer (87) are fixedly arranged on the lower mounting plate (4), the first electromagnetic switch (86) is electrically connected with the cylindrical tin oxide (85) through the controller (14), the buzzer (87) is electrically connected with the first electromagnetic switch (86) through the controller (14), the upper end of the ball (81) is arranged in an open manner, an inner convex air baffle ring (88) is integrally arranged on the inner wall of the ball (81), and the second electromagnetic switch (137) is electrically connected with the cylindrical tin oxide (85); The alternate walking mechanism (11) comprises two walking wheels (111) fixedly arranged on the inner wall of each half ring plate (1), and the two walking wheels (111) on the same side are symmetrically arranged, the wheel wall of each walking wheel (111) is in abutting arrangement with the outer pipe wall of the pipeline (2), the side walls of the two hingedly connected half ring plates (1) are fixedly inserted with electric push rods (112), the output ends of the two electric push rods (112) are fixedly connected with the side walls of the corresponding half ring plates (1), the two electric push rods (112) are electrically connected with the controller (14), and the side walls of the two parallel half ring plates (1) on the opposite sides are fixedly connected with side top columns (113), and the end portions of the two side top columns (113) are provided with stroke switches (114) electrically connected with the controller (14).

2. The explosive gas detection device of claim 1, wherein, The shunt assembly (10) includes a shunt cavity (101) opened in the inside of the protrusion (71), and the shunt cavity (101) is fixedly and communicatively arranged with the gas conveying pipe (73), both cavity walls of the shunt cavity (101) are fixedly and pluggably provided with shunt pipes (102), the inside of both shunt pipes (102) is mounted with first normally closed electromagnetic valves (103), the inner wall of both half ring plates (1) is commonly provided with annular grooves (104) which are in communication with the annular air bag sleeve (9) at both ends, and both annular grooves (104) are fixedly and pluggably provided with a communication pipe (105), the pipe end of both shunt pipes (102) is fixedly and communicatively provided with a hose (106) corresponding to the annular groove (104), the inside of the gas conveying pipe (73) is mounted with a second normally closed electromagnetic valve (107), the first normally closed electromagnetic valve (103) and the second normally closed electromagnetic valve (107) are electrically connected with the controller (14), the side wall of both annular grooves (104) is fixedly and pluggably provided with a circular pipe (108), and the inside of both circular pipes (108) is mounted with a third normally closed electromagnetic valve (109), and the exhaust pipe (133) is arranged above the second normally closed electromagnetic valve (107).

3. The explosive gas detection device of claim 1, wherein, Both gas pressure detection mechanisms (12) include mounting grooves (121) opened in the inner wall of the half ring plate (1), and the mounting grooves (121) are arranged between the annular air bag sleeves (9) on the same side, the groove bottom of the mounting groove (121) is fixedly mounted with a gas pressure automatic switch (122), and the groove opening of the mounting groove (121) is fixedly packaged with an elastic film (123), both gas pressure automatic switches (122) are electrically connected with the buzzer (87) through the controller (14).

4. The explosive gas detection device of claim 1, wherein, The opening of the spherical ball (81) is fixedly and pluggably provided with an air inlet pipe (16), the pipe end of the air inlet pipe (16) is fixedly and communicatively provided with a hollow circular plate (17), and the side wall of the hollow circular plate (17) is provided with a plurality of air inlet holes (18).

5. The explosive gas detection device of claim 1, wherein, The side wall lower end of both safety air bags (132) is fixedly and pluggably provided with a gas pressure pipe (19), and the inside of both gas pressure pipes (19) is mounted with a gas pressure valve (20).

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