CN110174441A - A kind of public transport safety early warning system and method for early warning based on wireless Internet of Things - Google Patents

Abstract

The invention discloses a kind of public transport safety early warning systems and method for early warning based on wireless Internet of Things, wherein the public transport safety early warning system based on wireless Internet of Things includes: bus door safety check apparatus, dangerous material automatic detection device and master controller；Bus door safety check apparatus includes: blower bar and detection bar, and the air that detection bar is pumped into passes through same rectification air duct and send to air detector module detection；Dangerous material automatic detection device includes: the first exhaust fan, wind guide channel, semiconductor transducer plate, antenna and main control board, master controller respectively with the second exhaust fan, pressure fan communication connection, and master controller is connect with main control board, any two danger automatic detection device passes through antenna communication connection and method for early warning.Dangerous situation detection time of the invention shortens, fast response time, and detection bar, there are two in the case where the second exhaust fan, only needs an air detector module that can detect the air of two the second exhaust fans suction simultaneously in tool.

Description

A kind of public transport safety early warning system and method for early warning based on wireless Internet of Things

Technical field

The present invention relates to public safety technical field, it is related to a kind of public transport safety early warning system based on wireless Internet of Things and pre- Alarm method.

Background technique

Public safety includes information security, food safety, public health security, Public Traveling rule safety, refugee's row For safety, the place safety of evacuating personnel, building safety, urban lifeline safety, malice and non-malicious personal safety and people Member's evacuation etc..

The vehicles of common that bus is gone on a journey as citizen, the requirement for its safety needs especially to pay attention to, if multiplying Visitor carries hazardous goods such as inflammables and explosives and takes bus, if accident, which occurs, will lead to great safety accident, and in the prior art Detection device for detecting interior inflammable and explosive dangerous goods generally uses and is mounted with a sensor in a box body, and the inspection It surveys device to be placed in bus, even if setting detects the detection bar of dangerous material at car door, general detection bar can multiply in correspondence Exhaust fan is set at the position at the back of the knee and passenger of visitor and air is sucked by exhaust fan, that is, needs two exhaust fans, Then the air sucked is transferred to corresponding air detector module and is detected, but since each exhaust fan requires pair One air detector module should be set, the cost increase of entire detection bar is caused.

Summary of the invention

The object of the present invention is to provide a kind of public transport safety early warning system and method for early warning based on wireless Internet of Things, dangerous situation inspections Time shortening is surveyed, fast response time, there are two in the case where the second exhaust fan in tool for detection bar, it is only necessary to an air detection list Member can detect the air of two the second exhaust fans suction simultaneously, save the acquisition cost of an air detector module.Early warning Method realizes that multiple dangerous material automatic detection device automatic network-buildings, single dangerous material automatic detection device find dangerous situation, all danger The dangerous same alarm of product automatic detection device.

Technical solution provided by the invention is as follows:

A kind of public transport safety early warning system based on wireless Internet of Things, comprising: the bus at the car door of bus is set Door safety check apparatus, be arranged in bus multiple dangerous material automatic detection devices, be arranged at bus door close to switch, Driver's cabin control panel and master controller, multiple dangerous material automatic detection devices are set to the different location in bus, It is described to be connect close to switch, driver's cabin control panel with the master controller；The bus door safety check apparatus includes: blower Bar and detection bar, the blower bar and detection bar are separately positioned on the car door two sides of bus；The detection bar includes: detection bar Shell and two the second exhaust fans being arranged in the detection bar shell, two second exhaust fans are arranged along vertical direction Cloth, the air for the outside that second exhaust fan will test bar shell are pumped into the inside of the detection bar shell；Rectify air duct, institute State rectification air duct include a chimney fan and two air intake passages, wherein one end of two air intake passages with the chimney fan Connection and be located at the chimney fan it is ipsilateral, the air intake passage along its axis direction be in bending, air intake passage it is separate One end of chimney fan is connected to the air outlet of the second exhaust fan；Air detector module, the air detector module are arranged described In detection bar shell and one end of the separate air intake passage of the chimney fan directs the air to carry out at the air detector module Detection；The blower bar includes two pressure fan that air is blowed to detection bar, and the air outlet face of the pressure fan corresponds to position Set the air intake vent of second exhaust fan at place；The dangerous material automatic detection device includes: upper cover and bottom plate, the upper cover with Bottom plate is detachably connected, and the upper cover and bottom plate constitute an accommodation space；First exhaust fan, first exhaust fan are set to institute It states in accommodation space, and the upper cover corresponds to and offers suction opening at first exhaust fan；Wind guide channel, the wind guide channel are located at In the accommodation space, the wind guide channel includes the first air dam and the second air dam interconnected, first air dam The air outlet of first exhaust fan described in one end face far from the second air dam, first air dam and bottom plate constitute the first son Air duct, second air dam and bottom plate constitute the second sub-air channel, and the extending direction of first sub-air channel favours described the The extending direction of two sub-air channels, the bottom plate, which corresponds to, is equipped with bottom plate ventilation opening at the wind guide channel；Semiconductor transducer plate, it is described Semiconductor transducer plate is located at first air dam at first exhaust fan；Main control board and alarm device, institute State main control board and alarm device be located in the accommodation space, the main control board respectively with semiconductor transducer plate, Alarm device, the first exhaust fan communication connection；Antenna, the antenna be rotatably dispose on the upper lid and the antenna with it is described Main control board communication connection；The master controller connects with all second exhaust fans, all pressure fan communications respectively It connects, and the master controller is logical by the corresponding antenna with the main control board of each dangerous material automatic detection device News connect, and danger automatic detection device described in any two passes through corresponding antenna communication connection.

In above structure, surrounding air is transported to semiconductor sensing by the first exhaust fan by dangerous material automatic detection device It is detected at device plate, being flowed into box body naturally compared to air can just be detected, the sound of dangerous material automatic detection device Answer speed fast, dangerous situation detection time shortens, and since the first air dam and the second air dam of wind guide channel are obliquely installed, can reduce First exhaust fan is sent into the rebound of the air in wind guide channel, i.e. the air about 80~90% that the first exhaust fan is sent out can be blown To at semiconductor transducer plate, the air suction efficiency of the first exhaust fan is improved.The two of the rectification air duct of bus door safety check apparatus A air intake passage is separately connected the second different exhaust fans, by the way that rectification air duct is arranged in detection bar by two the second exhaust fans The air of suction is delivered at air detector module at the chimney fan in rectification air duct is detected together, and script is needed two Air detector module is reduced to an air detector module, reduces the acquisition cost of an air detector module.Simultaneously because Air intake passage is in bending along its axis direction, according to aerodynamic principle, so that the air in air intake passage is more sticked on The inner wall closed in air intake passage flows, and reduces air rebound, reduces the frictional force that air is subject in flow process, guarantees each The exhausting amount of second exhaust fan is stablized.Antenna is for realizing the mutual communication and danger between multiple dangerous material automatic detection devices The communication connection of dangerous product automatic detection device and master controller realizes the automatic network-building of multiple dangerous material automatic detection devices, single A dangerous material automatic detection device finds dangerous situation, function of all dangerous material automatic detection devices with alarm.It is opened by close Close whether induction has passenger loading at the bus door, if being triggered close to switch, confirmation has passenger loading, at this time close to opening It closes and sends trigger signal to master controller, master controller control bus door safety check apparatus starts operation.It is controlled by driver's cabin Panel carries out real-time display to the testing result and dangerous situation of bus door safety check apparatus, and can pass through driver's cabin control panel Control bus door safety check apparatus whether start operation so that bus door safety check apparatus can by close to after inductive switching from It is dynamic to open, it can also be by manually opened.

Preferably, first air dam and the second air dam are arranged on the bottom plate；The first air dam packet Include sequentially connected first wind deflector, incline plate and the second wind deflector, first wind deflector is parallel to each other with the second wind deflector, institute It states the plate that inclines to tilt along the direction far from the first exhaust fan towards bottom plate, first wind deflector one end and institute far from the plate that inclines The second wind deflector is stated to be set on the bottom plate far from the one end for the plate that inclines；The corresponding position of first wind deflector and the second wind deflector It sets place and is equipped with a pair of of clamping flange, a pair of clamping flange extends towards direction close to each other, and the clamping flange leans on One end of nearly bottom plate extends towards the plate that inclines；The both ends of the semiconductor transducer plate are respectively provided with a clamping block, the clamping block card Between the clamping flange and the plate that inclines of respective side.

In above structure, semiconductor transducer plate is connected to and is inclined on plate by clamping block and clamping flange, facilitates semiconductor Sensor board is removed and installed the plate that inclines.

Preferably, second air dam includes third wind deflector, and the edge of the third wind deflector extends towards bottom plate Vertical plate is constituted, the vertical plate is set on the bottom plate far from one end of the third wind deflector；First sub-air channel The extending direction for extending perpendicularly to second sub-air channel.

Preferably, the bottom plate is equipped with draught deflector, and the draught deflector is located at air outlet and the institute of first exhaust fan It states between semiconductor transducer plate.

In above structure, draught deflector can stop the air of a part to enter in wind guide channel from the first exhaust fan, increase empty Residence time of the gas at semiconductor transducer plate improves the accuracy in detection of semiconductor transducer plate.

Preferably, the blower bar further includes blower bar shell and the first fixation being arranged in the blower bar shell Plate, two blower settings are in first fixed plate；Petal nozzle is equipped at the air outlet of the pressure fan, it is described Petal nozzle includes interconnected deformation air duct and petal spray head, and the deformation air duct is connected in far from one end of petal spray head The air outlet of the pressure fan, the petal spray head stretch out the blower bar shell far from the one end in deformation air duct and pass through petal Fixed plate is fixed on blower bar shell；Along the direction that air flows, the cross sectional shape in the deformation air duct is gradually by rectangle Change to circle, the deformation air duct is in the area of section and the area of section phase at the rounded place in deformation air duct at rectangle Deng；Along the direction that air flows, the cross sectional shape of the petal spray head is gradually from circle to petal change in shape, the flower The area of section at the rounded place of valve spray head is equal in the area of section at petal place with the petal spray head, and the petal spray head is in Angle between the center line of the adjacent two panels petal in the section at petal place is equal；The petal spray head is cut in petal place The ratio of the length of the widest part of the height and every petal of the petal of every of face is between 1~1.5.

In above structure, the air being discharged from the air outlet of pressure fan is certain inclined being dispersed with originally in deformation air duct The air-flow of corner is gradual to be avoided inverse to the outer wall for being parallel to deformation air duct so that air-flow is more concentrated, VELOCITY DISTRIBUTION is more uniform Pressure gradient flow reduces it by flow resistance, reduces flow losses.Deformation air duct is in the area of section and deformation wind at rectangle The phenomenon that area of section at the rounded place in road is equal, avoids the occurrence of mutual extrusion between streamline.Meanwhile when air passes through the petal When spray head, the speed of the region interior air-flow of the every petal in the section at petal place increases, and static pressure reduces, can be with injection a part Region between two panels petal, i.e. gas static at the outside wall surface of petal spray head, thus under identical operating condition with biography Blower unite compared to the flow for increasing gas.The design of petal spray head can allow the second exhaust fan to increase wind under identical operating condition Machine flow.

Preferably, the detection bar further includes the second fixed plate, and second fixed plate is set to the detection bar shell Inside, two second exhaust fans and air detector module are arranged in second fixed plate；The chimney fan is The side of the chimney fan is arranged in divergent shape for cylindrical shape, two air intake passages；The chimney fan passes through described second Fixed plate is simultaneously fixed in second fixed plate, and two air intake passages are located at the ipsilateral of second fixed plate；It is described Detection bar further includes wind deflector, and the wind deflector is arranged in second fixed plate；The cross sectional shape of the wind deflector is in U Type, along the extending direction of the wind deflector, the first end of the wind deflector is closed end, and the second end of the wind deflector is spacious Beginning constitutes air-guiding aisle, the first end of the air-guiding aisle and the chimney fan between the wind deflector and the second fixed plate It is connected to, air detector module described in the second end face of the air-guiding aisle；A barrier, the barrier are equipped in the chimney fan The inside of the chimney fan is divided into two air ducts, respectively the first air duct and the second air duct, first air duct and the second wind Road is connected to an air intake passage respectively.

In above structure, the air conducting being discharged out of chimney fan is examined to from air detector module by wind deflector It surveys, plays the guiding function to air, further increase the detection efficiency and accuracy of air detector module.By the way that barrier is arranged The air of two air intake passages is separated, thus avoid when two the second exhaust fans using the time is longer and after power declines, the The air inlet that the air back-pressure that the biggish side of two exhaust fan power can be pumped into enters the lower-powered side of the second exhaust fan leads to In road, whole air suction efficiency is caused to decline.

Preferably, it is equipped with wind scooper at the suction opening of second exhaust fan and at the air intake vent of pressure fan, it is described to lead The surface of fan housing be it is coarse, the wind scooper is in bottomless bowl structure and the wind scooper includes wall surface, the mouth of the wall surface The lesser one end of diameter is wind scooper air outlet, and the biggish one end of the bore of the wall surface is wind scooper air intake vent；Positioned at described The wind scooper air outlet of the wind scooper at two exhaust fans is connect with the suction opening of the second exhaust fan, is located at second exhausting The wind scooper air intake vent of the wind scooper at machine is flushed with the detection bar shell；The wind-guiding at the pressure fan The wind scooper air outlet of cover and the air intake vent of pressure fan connect, the wind scooper inlet air of the wind scooper at the pressure fan Mouth is flushed with the blower bar shell；The diameter of section of the wind scooper air intake vent is d, and the section of the wind scooper air outlet is straight Diameter is D, and the radius ratio of D/d is between 1.5~2；The wall surface is along the length H and wind scooper inlet air on itself axis direction The ratio of the diameter of section d of mouth is between 0.75~1；The radius of curvature R of the wall surface and the diameter of section d of wind scooper air intake vent Ratio between 1.5~2.

It is such to can be designed so that outer core stream preferably sucks the since wind scooper is the design of bottomless bowl structure In two exhaust fans and pressure fan, the pressure loss in wind scooper is reduced, and in the identical perimeter of wind scooper air outlet, Area of section is maximum.The rough surface of wind scooper can keep some impurity and dust in air here, reduce the impurity in air Enter in exhaust fan with dust.It is limited by size to wind scooper, by limiting radius ratio D/d as 1.5~2, can be sucked Suitable outer gas stream reduces detection precision if D/d, which is greater than 2, can suck excessive external air flow, cannot if D/d is less than 1.5 Outer core stream is all sucked.Wall surface along length H and wind scooper air intake vent on itself axis direction diameter of section d Than H/d between 0.75~1, wind scooper cannot be fully embedded outside corresponding detection bar shell or blower bar if H/d is greater than 1 In shell, outer core stream cannot all be sucked if H/d is less than 0.75.The radius of curvature R of wall surface and wind scooper air intake vent Diameter of section d ratio R/d, if R/d is greater than 2, will appear back-pressure in wind scooper between 1.5-2, cannot incite somebody to action if R/d is less than 1.5 Outer core stream all sucks.

A kind of method for early warning, applied to the public transport safety early warning system above-mentioned based on wireless Internet of Things, driver's cabin control plane Plate is equipped with the touch screen for interaction, includes the following steps: to pass when the semiconductor of any one dangerous material automatic detection device When sensor plate detects dangerous situation, the main control board of the corresponding dangerous material automatic detection device passes through antenna for dangerous situation information It is transferred at other all dangerous material automatic detection devices and master controller, the police of all dangerous material automatic detection devices Reporting device and the same alarm of master controller；It is described to send open command to master controller close to after switch triggering or described drive It sails after the touch screen on the control panel of room receives open command, open command is transferred to master control by the driver's cabin control panel Device processed, the second exhaust fan, pressure fan and the air detector module of the master controller control bus door safety check apparatus start to transport Make, for the transmission of feedback information that air detector module will test to master controller, the feedback information is security information or danger Dangerous information, master controller identify the feedback information；When the feedback information is dangerous information, master controller passes through driver's cabin control The touch screen of panel processed is alarmed to driver；When the feedback information be security information, master controller control air detector module, Second exhaust fan and pressure fan stop detecting.

In the above method, the identification of dangerous situation is carried out by air detector module, when air detector module detects dangerous situation, Feedback information is dangerous information, at this point, the feedback information that master controller receives as dangerous information, master controller is reported to driver It is alert.When air detector module does not detect dangerous situation, feedback information is security information, at this point, master controller receives as peace The feedback information of full information, master controller, which controls air detector module, exhaust fan and pressure fan, to be stopped detecting.Meanwhile setting exists It is inflammable whether the blower bar at bus door carries with the passenger at bus door with detection bar for measuring station Explosive dangerous material, and identification alarm is carried out in time.

Preferably, the method for early warning further comprise the steps of: all second exhaust fans and all pressure fan by its Corresponding real time status information is transferred to master controller, and master controller identifies the real time status information；When the master controller Judge to obtain all second exhaust fans according to the real time status information and when all pressure fan operate normally, institute It states master controller and does not do any operation；When the master controller according to the real time status information judge to obtain it is any one of Second exhaust fan or pressure fan are when in an abnormal state, and the master controller controls all second exhaust fans and all institutes State pressure fan it is out of service and to driver alarm.

In the above method, the real-time status of master controller real-time detection the second exhaust fan and pressure fan, if discovery second is taken out Any one in blower or pressure fan goes wrong, then master controller by all second exhaust fans and pressure fan it is out of service and to Driver's alarm prompts the second exhaust fan or pressure fan damage in driver's bus door safety check apparatus.

Preferably, the dangerous situation information includes the dangerous material automatic detection device position at dangerous situation generation position and dangerous situation Information occurs；After master controller receives dangerous situation information, the danger at position is occurred for the dangerous situation received by the master controller Dangerous product automatic detection device location transmission is to driver's cabin control panel and is shown on the touchscreen, and the master controller will The dangerous situation received occurs information and is shown on driver's cabin control panel to prompt driver's dangerous situation to occur.

Preferably, the method for early warning further comprise the steps of: ought within a preset period of time, master controller report by mistake dangerous situation number Reach preset quantity, then passes through the master control electricity of the air detector module of bus door mounting device and dangerous material automatic detection device Detection chip on the plate of road obtains surrounding enviroment parameter, and is for judgement according to the surrounding enviroment parameter regulation master controller The parameter current sets of threshold values of no alarm.

The numerical value such as temperature, humidity or the alcohol content of air due to each area are all different, according to same One parameter threshold group carry out judge will lead to wrong report situation it is obvious, therefore, when discovery within a preset period of time wrong report number reach When preset quantity, the surrounding enviroment parameter in location is obtained, and according to the surrounding enviroment parameter regulation parameter current sets of threshold values, is used To adapt to the environment in location, the probability of wrong report is reduced.

Preferably, multiple groups parameter threshold group is stored in master controller, driver is chosen by driver's cabin control panel and closed Suitable parameter threshold group is as the parameter current sets of threshold values.

A kind of public transport safety early warning system and method for early warning based on wireless Internet of Things provided by the invention, can bring following The utility model has the advantages that

Surrounding air is transported to semiconductor sensing by the first exhaust fan by the dangerous material automatic detection device in the present invention It is detected at device plate, fast response time, dangerous situation detection time shortens, due to the first air dam and the second air dam of wind guide channel It is obliquely installed, the rebound that the first exhaust fan sends out air can be reduced, thus the air about 80 of the first exhaust fan submitting~ 90% can blow at semiconductor transducer plate.Bus door safety check apparatus can lead to the air that two the second exhaust fans are pumped into Over commutation air duct is directed at same air detector module simultaneously and is detected, and has saved an air detection compared with the existing technology The cost of unit.Simultaneously the present invention also provides a kind of method for early warning, by detect simultaneously at bus door with it is each in bus Place guarantees the safety of bus with the presence or absence of dangerous material, and dangerous situation occurs and finds that simultaneously alert process, multiple dangerous material are examined automatically in time Device automatic network-building is surveyed, single dangerous material automatic detection device finds dangerous situation, all same alarms of dangerous material automatic detection device.

Detailed description of the invention

Below by clearly understandable mode, preferred embodiment is described with reference to the drawings, to the public transport based on wireless Internet of Things Above-mentioned characteristic, technical characteristic, advantage and its implementation of safety pre-warning system and method for early warning are further described.

Fig. 1 is the structural schematic diagram of dangerous material automatic detection device；

Fig. 2 is the structural schematic diagram of upper cover；

Fig. 3 is that dangerous material automatic detection device takes down the structural schematic diagram after upper cover, antenna and waterproof connector；

Fig. 4 is the structural schematic diagram of bottom plate；

Fig. 5 is the structural schematic diagram of wind guide channel；

Fig. 6 is the structural schematic diagram of the wind guide channel looked over from another direction；

Fig. 7 is the structural schematic diagram of the blower bar in bus door safety check apparatus；

Fig. 8 is that blower bar removes the schematic diagram after blower bar shell；

Fig. 9 is the structural schematic diagram after pressure fan, petal nozzle and air guiding cover association；

Figure 10 is the structural schematic diagram of wind scooper；

Figure 11 is the structural schematic diagram that wind scooper is looked over from another direction；

Figure 12 is the structural schematic diagram of petal fixed plate；

Figure 13 is the structural schematic diagram of the detection bar in bus door safety check apparatus；

Figure 14 is that detection bar removes the schematic diagram after detection bar shell；

Figure 15 is the bottom view for rectifying air duct；

Figure 16 is the side view for rectifying air duct；

Figure 17 is the top view for rectifying air duct.

Drawing reference numeral explanation:

1- bottom plate, the first card slot of 1a-, 1b- draught deflector, 1c- bottom plate ventilation opening, 2- upper cover, 2a- suction opening, 2b- indicator light Mouthful, 2c- buzzing mouth, 2d- containing cavities, 2e- lattice shelves, 2f- blowing mouth, the second card slot of 2g-, 3- antenna, 4- waterproof connector, 5- first Exhaust fan, 6- wind guide channel, the first air dam of 6a-, the second air dam of 6b-, 6c- are clamped flange, the first wind deflector of 6d-, 6e- second Wind deflector, 6f- notch, 6g- incline plate, 6h- air outlet, 6i- third wind deflector, 6j- vertical plate, 7- semiconductor transducer plate, 7a- Clamping block, 8- main control board, 9- alarm device, 10- indicator light, 11- buzzer, 12- blower bar, 12a- blower bar shell, The first fixed plate of 12b-, 13- wind scooper, 13a- wall surface, 13b- torus, 13c- connecting plate, 13d- wind scooper air outlet, 13e- Wind scooper air intake vent, 14- petal fixed plate, 14a- petal mouth, 15- pressure fan, 15a- air outlet, 16- petal nozzle, 16a- shape Become air duct, 16b- petal spray head, 16c- buckle, 17- detection bar, 17a- detection bar shell, the second fixed plate of 17b-, 18- second Exhaust fan, 19- rectify air duct, 19a- chimney fan, 19b- air intake passage, 19c- barrier, 20- wind deflector, 21- air detection list Member.

Specific embodiment

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, Detailed description of the invention will be compareed below A specific embodiment of the invention.It should be evident that drawings in the following description are only some embodiments of the invention, for For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other Attached drawing, and obtain other embodiments.

To make simplified form, part related to the present invention is only schematically shown in each figure, their not generations Its practical structures as product of table.

[embodiment 1]

As shown in Fig. 1~Figure 17, present embodiment discloses a kind of tools of public transport safety early warning system based on wireless Internet of Things Body embodiment, comprising: multiple danger that the bus door safety check apparatus at the car door of bus is set, is arranged in bus Dangerous product automatic detection device, be arranged at bus door close to switch, driver's cabin control panel and master controller, dangerous material from Motion detection device is mounted on the seat side in bus, nearby whether there is inflammable and explosive Deng danger for detecting the orientation Whether product have dangerous situation.It is connect close to switch, driver's cabin control panel with master controller.

As shown in Fig. 7~Figure 17, bus door safety check apparatus includes: the blower bar 12 for being separately positioned on bus door two sides With detection bar 17, blower bar 12 and detection bar 17 are respectively positioned in bus.

As shown in figures 13 and 14, detection bar 17 include: detection bar shell 17a, be arranged in detection bar shell 17a two A second exhaust fan 18, be set to detection bar shell 17a inside the second fixed plate 17b, rectification air duct 19 and air inspection Survey unit 21.

As shown in figures 13 and 14, the second fixed plate 17b is vertically arranged in detection bar shell 17a, two the second exhausting Machine 18 and air detector module 21 are fixed on the second fixed plate 17b, and air detector module 21 is arranged outside detection bar In shell 17a.Wherein, two the second exhaust fans 18 are arranged along vertical direction, and the second exhaust fan 18 will test the outer of bar shell 17a The air in portion is pumped into the inside of detection bar shell 17a, and the height of higher-height second exhaust fan 18 is equivalent to the back of passenger The height of position, the height of a lower height of second exhaust fan 18 are equivalent to the height of the knee position of passenger.

As shown in figure 14, the air of two the second exhaust fans 18 extraction is transported to same air detection by rectifying air duct 19 It is detected at unit 21, which is connected on second fixed plate 17b, specifically, as shown in Figure 14~Figure 17, Rectifying air duct 19 includes a cylindrical chimney fan 19a and two air intake passage 19b, and wherein the one of two air intake passage 19b End is connected to chimney fan 19a and positioned at the ipsilateral of chimney fan 19a, one end diameter of the chimney fan 19a towards close air intake passage 19b It is gradually reduced to size, chimney fan 19a passes through the second fixed plate 17b and is fixed on the second fixed plate 17b, two air intake passages 19b is located at the ipsilateral of the second fixed plate 17b.

As shown in figure 16 and figure 17, the side of chimney fan 19a is arranged in divergent shape by two air intake passage 19b, and air inlet is logical Road 19b is in bending, one end and the second exhaust fan 18 of the separate chimney fan 19a of air intake passage 19b along its axis direction Air outlet connection, the air that the air outlet of two the second exhaust fans 18 comes out flow to chimney fan 19a's along air intake passage 19b At one end far from air intake passage 19b, then it is taken at air detector module 21 and is detected.

As shown in figure 14, one end of the separate air intake passage 19b of chimney fan 19a directs the air at air detector module 21 It is detected, specifically, being additionally provided with wind deflector 20 on the second fixed plate 17b, the cross sectional shape of the wind deflector 20 is U-shaped, along The extending direction (i.e. the vertical direction of Figure 14) of wind deflector 20, the first end (upper end of the wind deflector 20 in Figure 14) of wind deflector 20 For closed end, the second end (lower end of the wind deflector 20 in Figure 14) of wind deflector 20 is open end, and wind deflector 20 and second are fixed Air-guiding aisle is constituted between plate 17b, is connected at the first end of air-guiding aisle with chimney fan 19a, the second end face of air-guiding aisle Air detector module 21.

As illustrated in figs. 7 and 8, blower bar 12 includes two pressure fan 15 that air is blowed to detection bar 17, two air-supplies Machine 15 and the height of two the second exhaust fans 18 are equal to each other, and the second of the air outlet 15a face corresponding position of pressure fan 15 The air intake vent of exhaust fan 18.

In order to realize being uniformly controlled for the second exhaust fan 18 and pressure fan 15, the second exhaust fan 18 and pressure fan 15 respectively with Master controller communication connection, so that master controller can control the start and stop of the second exhaust fan 18 and pressure fan 15.

As shown in figure 15, a barrier 19c is equipped in chimney fan 19a, the inside of chimney fan 19a is divided into two by barrier 19c A air duct, respectively the first air duct and the second air duct, the first air duct is connected to an air intake passage 19b respectively with the second air duct. That is the first air duct receives the air being pumped into from one of them second exhaust fan 18 by one of air intake passage 19b, the Two air ducts receive the air being pumped into from another second exhaust fan 18 by another air intake passage 19b.When long Between after use, the power of two the second exhaust fans 18 may become different, so as to cause lower second exhaust fan 18 of power Place generate reflux the phenomenon that, and then further result in the second exhaust fan 18 power decline, and barrier 19c can block air into Enter to be back to another air intake passage 19b, to reduce backflow phenomenon.

As shown in Fig. 1~Fig. 6, dangerous material automatic detection device includes: upper cover 2 and bottom plate 1, and upper cover 2 and bottom plate 1 are detachable Connection, upper cover 2 and bottom plate 1 constitute an accommodation space.

As shown in FIG. 1 to 3, the present embodiment further includes the first exhaust fan 5, wind guide channel 6, semiconductor transducer plate 7, antenna 3, main control board 8 and alarm device 9.First exhaust fan 5 is set in accommodation space, and at corresponding first exhaust fan 5 of upper cover 2 Offer suction opening 2a.

Wind guide channel 6 is located in accommodation space, and wind guide channel 6 includes the first air dam 6a interconnected and the second air dam The air outlet 15a, the first air dam 6a of the first exhaust fan of one end face 5 of 6b, the first air dam 6a far from the second air dam 6b The first sub-air channel is constituted with bottom plate 1, the second air dam 6b and bottom plate 1 constitute the second sub-air channel, the extending direction of the first sub-air channel Perpendicular to the extending direction of the second sub-air channel, several bottom plate ventilation openings 1c is equipped at the corresponding wind guide channel 6 of bottom plate 1.Semiconductor passes Sensor plate 7 is located at the first air dam 6a at the first exhaust fan 5, for whether detecting the air sent by the first exhaust fan 5 Contain inflammable and explosive equal hazard components.

In other specific embodiments, the extending direction of the first sub-air channel favours the extending direction of the second sub-air channel, should Inclined angle value, the first exhaust fan 5 of guarantee can be transported to the rebound of the air at the first sub-air channel to the greatest extent according to the actual situation Amount is few, and details are not described herein again.

As shown in Fig. 2, accommodation space in be equipped with lattice shelves 2e, the lattice shelves 2e by accommodation space be divided into first receiving space with Second accommodation space, the first exhaust fan 5 are located in first receiving space, and wind guide channel 6 is located in the second accommodation space.2e pairs of lattice shelves Answer and offer blowing mouth 2f at the air outlet 15a of the first exhaust fan 5, the air that the first exhaust fan 5 is sent by blowing mouth 2f into Enter in wind guide channel 6.

Specifically, the first air dam 6a and the second air dam 6b are arranged on bottom plate 1 as shown in Fig. 3, Fig. 5 and Fig. 6. As shown in figs. 5 and 6, the first air dam 6a includes sequentially connected first wind deflector 6d, incline plate 6g and the second wind deflector 6e, the One wind deflector 6d is parallel to each other with the second wind deflector 6e, and the plate 6g that inclines inclines along the direction far from the first exhaust fan 5 towards bottom plate 1 Tiltedly, the one end and the second wind deflector 6e far from the plate 6g that inclines the first wind deflector 6d are set on bottom plate 1 far from the one end for the plate 6g that inclines.

As shown in Fig. 2, it is equipped with the second card slot 2g at the position of the corresponding first wind deflector 6d and the second wind deflector 6e of lattice shelves 2e, First wind deflector 6d and the second wind deflector 6e is fastened in second card slot 2g.

As shown in figs. 5 and 6, the corresponding position of the first wind deflector 6d and the second wind deflector 6e are equipped with a pair of of clamping flange 6c, a pair of clamping flange 6c extend towards direction close to each other, and are clamped flange 6c close to one end of bottom plate 1 towards the plate 6g that inclines Extend.The both ends of semiconductor transducer plate 7 are respectively provided with a clamping block 7a, clamping block 7a be arranged in the clamping flange 6c of respective side with Incline between plate 6g, is finally held by clamping flange 6c towards the part that bottom plate 1 extends.For the ease of being taken from the first air dam 6a Semiconductor transducer plate 7 out opens up a notch 6f close to one end of upper cover 2 inclining plate 6g, when needing to take out semiconductor transducer When plate 7, finger touches semiconductor transducer plate 7 by notch 6f, it is taken out from the first air dam 6a.

Second air dam 6b includes third wind deflector 6i, and the edge of third wind deflector 6i extends towards bottom plate 1 to be constituted vertically Plate 6j, vertical plate 6j are set on bottom plate 1 far from one end of third wind deflector 6i.Air outlet is offered on third wind deflector 6i 6h。

As shown in Figure 3 and Figure 4, the first wind deflector 6d and the second wind deflector 6e of the corresponding first air dam 6a of bottom plate 1 and The first card slot 1a, the first wind deflector 6d of the first air dam 6a and second is equipped at the position of the vertical plate 6j of second air dam 6b The vertical plate 6j of wind deflector 6e and the second air dam 6b are fastened in first card slot 1a, so that wind guide channel 6 is mounted on bottom On plate 1.

As shown in Fig. 3 and Fig. 6, the second wind deflector 6e has certain distance close to one end dative shelves 2e of bottom plate 1, thus the The air of one air dam 6a can be flowed out wind guide channel 6 by the gap between the second wind deflector 6e dative shelves 2e and be divulged information by bottom plate Mouth 1c outflow.

As shown in Figure 2 and Figure 3, draught deflector 1b is additionally provided on bottom plate 1, draught deflector 1b is located at the air outlet of the first exhaust fan 5 Between 15a and semiconductor transducer plate 7, draught deflector 1b stops the air of a part to enter wind guide channel 6 from the first exhaust fan 5 It is interior, increase residence time of the air at semiconductor transducer plate 7, improves the accuracy in detection of semiconductor transducer plate 7.

As shown in Figure 1, there is the containing cavities 2d towards internal stretch in the side of upper cover 2, antenna 3 is rotatably dispose in upper cover 2, When antenna 3 collapses, antenna 3 is located in containing cavities 2d.Any two danger automatic detection device passes through corresponding antenna 3 Communication connection, thus the dangerous automatic detection device automatic network-building of institute, master controller and each dangerous material automatic detection device Main control board 8 passes through corresponding 3 communication connection of antenna.

As shown in Figures 1 and 3, main control board 8 and alarm device 9 are located in accommodation space, main control board 8 respectively with The side of semiconductor transducer plate 7,3 communication connection of alarm device 9, the first exhaust fan 5 and antenna, upper cover 2 is equipped with waterproof Connector 4, main control board 8, semiconductor transducer plate 7, alarm device 9, the mating electric wire of the first exhaust fan 5 and antenna 3 are equal Pass through the waterproof connector 4 and external connection.

As shown in FIG. 1 to 3, alarm device 9 includes buzzer 11 and indicator light 10, the position of the corresponding buzzer 11 of upper cover 2 The place of setting offers buzzing mouth 2c, offers instruction socket 2b, a part of indicator light 10 at the position of the corresponding indicator light 10 of upper cover 2 It is stretched out outside upper cover 2 by instruction socket 2b.

The dangerous material automatic detection device of the present embodiment passes through the first exhaust fan 5 for the air delivery of surrounding to the first wind-guiding Semiconductor transducer plate 7 at portion 6a carries out dangerous situation detection, if discovery dangerous situation, semiconductor transducer plate 7 sends triggering information To main control board 8, main control board 8 makes buzzer 11 sound and light indicator light 10 again, and dangerous situation information is passed through Antenna 3 is sent to other dangerous material automatic detection devices and/or master controller is alarmed.

[embodiment 2]

As shown in Fig. 7~Fig. 8, on the basis of embodiment 1, the blower bar 12 of embodiment 2 further includes blower bar to embodiment 2 Shell 12a is vertically arranged with the first fixed plate 12b being arranged in blower bar shell 12a, the first fixed plate 12b, two air-supplies Machine 15 is arranged on the first fixed plate 12b.

As shown in Fig. 8 and Fig. 9, petal nozzle 16 is equipped at the air outlet 15a of pressure fan 15, petal nozzle 16 includes mutual The one end of the deformation air duct 16a and petal spray head 16b of connection, deformation air duct 16a far from petal spray head 16b passes through buckle 16c card It is connected at the air outlet 15a of pressure fan 15, the one end of petal spray head 16b far from deformation air duct 16a be (the petal spray head 16b's of Fig. 9 Left end) it stretches out blower bar shell 12a and is fixed on blower bar shell 12a by petal fixed plate 14, along air flowing Direction, the cross sectional shape of deformation air duct 16a are gradually changed from rectangle to circle, and deformation air duct 16a is in the area of section at rectangle It is equal with the area of section at the deformation air duct rounded place 16a.

Along the direction that air flows, the cross sectional shape of petal spray head 16b gradually from circle to petal change in shape, is spent The area of section at the rounded place valve spray head 16b is in that the area of section at petal place is equal with petal spray head 16b, petal spray head 16b It is equal in the angle between the center line of the adjacent two panels petal in the section at petal place.

Specifically, as shown in figure 12, petal fixed plate 14 includes that one week annular of a straight panel and winding straight panel edge extends Portion offers in the straight panel in petal-like petal mouth 14a, and the edge of the straight panel prolongs towards close to the direction blower bar shell 12a It stretches to obtain the circular extent, the circular extent and straight panel constitute holding tank, and petal spray head 16b is protruded into petal one end In the holding tank and to being located at petal mouth 14a, the petal fixed plate 14 is for fixing petal spray head 16b while protecting petal Spray head 16b.

Petal spray head 16b is in the height of the every petal in the section at petal place and the length of the widest part of every petal Ratio is 1.25, and the widest part of every petal refers to petal near the central axis of petal spray head 16b.

In other specific embodiments, the ratio of the length of the widest part of the height of every petal and every petal can also be with It is 1,1.1,1.3,1.5 etc., carries out value between 1~1.5 according to the actual situation, details are not described herein again.

[embodiment 3]

As shown in Fig. 7~Figure 17, embodiment 3 is on the basis of 1~embodiment of embodiment 2, the second exhaust fan of embodiment 3 At 18 suction opening and it is equipped with wind scooper 13 at the air intake vent of pressure fan 15, which makes the second exhaust fan 18 and send Blower 15 can be sucked preferably from external air, reduce the second suction opening of exhaust fan 18 of sucking and entering for pressure fan 15 The unrelated air-flow of air port surrounding improves detection accuracy, while avoiding the suction opening of the second exhaust fan 18 and the inlet air of pressure fan 15 Mouth generates back-pressure phenomenon.

As shown in Figure 10 and Figure 11, the surface of wind scooper 13 be it is coarse, wind scooper 13 is in bottomless bowl structure and wind-guiding Cover 13 includes wall surface 13a, and the lesser one end of the bore of wall surface 13a is wind scooper air outlet 13d, and the bore of wall surface 13a is biggish One end is wind scooper air intake vent 13e, and wind scooper air outlet 13d is connect with the suction opening of the second exhaust fan 18, wind scooper air intake vent 13e is flushed with detection bar shell 17a.

Meanwhile a torus 13b is also arranged concentrically in the wall surface 13a of wind scooper 13, torus 13b passes through 3 pieces of connections Plate 13c is fixed on the wall surface 13a of wind scooper 13, and 3 pieces of connecting plate 13c are centered on the center of circle of torus 13b, in uniformly diverging Shape setting.Torus 13b is less than on axis direction of the wall surface 13a along itself along the length on the axis direction of wall surface 13a Length, and wind scooper air intake vent 13e is flushed with the corresponding end of torus 13b.The effect of torus 13b is barrier effect, Passenger is avoided to protrude into hand in the second exhaust fan 18 or pressure fan 15.

Specifically, the diameter of section of wind scooper air intake vent 13e is d, the diameter of section of wind scooper air outlet 13d is D, D/d Radius ratio be 1.5, wall surface 13a along length H and wind scooper air intake vent 13e on itself axis direction diameter of section d Ratio be 0.75, the ratio of the diameter of section d of the radius of curvature R and wind scooper air intake vent 13e of wall surface 13a is 1.5, i.e. d= 40mm, D=60mm, H=30mm, R=60mm.

In other specific embodiments, the radius ratio of D/d is also possible to other values between 1.5~2；The ratio of H/d Other values between 0.75~1；Other values of R/d ratio between 1.5~2, as long as meeting actual conditions, this Place repeats no more.

[embodiment 4]

Embodiment 4 discloses a kind of specific embodiment of method for early warning, applied to 1~embodiment of previous embodiment 3 Public transport safety early warning system based on wireless Internet of Things, wherein driver's cabin control panel is equipped with the touch screen for interaction, including Following steps:

When the semiconductor transducer plate of any one dangerous material automatic detection device detects dangerous situation, corresponding dangerous material The main control board of automatic detection device by antenna by dangerous situation information be transferred to other all dangerous material automatic detection devices with And at master controller, the alarm device and the same alarm of master controller of all dangerous material automatic detection devices.

Specifically, dangerous situation information includes dangerous material automatic detection device position and the dangerous situation generation at dangerous situation generation position Information, wherein the dangerous material automatic detection device position at position, which occurs, for dangerous situation indicates to detect that the dangerous material of dangerous situation are automatic Position where detection device, information, which occurs, for dangerous situation indicates that this state occurs for dangerous situation.

After master controller receives dangerous situation information, the dangerous material at position are occurred for the dangerous situation received certainly by master controller Motion detection device location transmission is to driver's cabin control panel and is shown, and information is occurred for the dangerous situation received by master controller It is shown on driver's cabin control panel to prompt driver's dangerous situation to occur.

Specifically, index in the air that semiconductor transducer plate detects is not in safe range, then semiconductor sensing Device plate generates corresponding dangerous situation information.

Open command is sent close to after switch triggering to master controller, master controller controls the of bus door safety check apparatus Two exhaust fans, pressure fan and air detector module start operation, i.e., bus door safety check apparatus starts the rigid passenger's body of getting on the bus of detection On whether carry dangerous material, for the transmission of feedback information that air detector module will test to master controller, which is peace Full information or dangerous information, master controller identify that the feedback information carries out subsequent action.

When feedback information is dangerous information, i.e. master controller is sentenced according to the indices in the air recorded in feedback information Break to there is dangerous situation, then feedback information is regarded as dangerous information by master controller, and master controller passes through on the control panel Touch screen is alarmed to driver.

When feedback information be security information, i.e., master controller is according to the indices in the air recorded in feedback information Be judged as that no dangerous situation occurs, then feedback information is regarded as security information by master controller, master controller control air detector module, Second exhaust fan and pressure fan stop detecting.

In other specific embodiments, open command can also be inputted by the touch screen on driver's cabin control panel, Then open command is transferred to master controller by driver's cabin control panel, and master controller controls the of bus door safety check apparatus again Two exhaust fans, pressure fan and air detector module start operation.

Meanwhile whether normally being transported to monitor all second exhaust fans in bus door safety check apparatus in real time with pressure fan Its corresponding real time status information is transferred to master controller with pressure fan by row, all second exhaust fans, and master controller identification is real When status information.

When master controller judges to obtain all second exhaust fans according to real time status information and pressure fan operates normally, Master controller does not do any operation.

When master controller judges to obtain any one second exhaust fan or pressure fan in different according to real time status information When normal state, all second exhaust fans of master controller control are out of service with pressure fan and alarm to driver.

[embodiment 5]

For embodiment 5 on the basis of embodiment 4, embodiment 5 further comprises the steps of: ought within a preset period of time, master controller The number of wrong report dangerous situation reaches preset quantity, then is examined automatically by the air detector module of bus door mounting device with dangerous material The detection chip surveyed on the main control board of device obtains surrounding enviroment parameter, and according to surrounding enviroment parameter regulation master controller For judging whether the parameter current sets of threshold values of alarm.

Wherein, preset time period can be 1 day, 5 days, 1 month etc., preset quantity can for 5 times, 8 times, it is 10 inferior Deng being arranged according to the actual situation.

Specifically, the detection chip on air detector module and main control board obtains surrounding enviroment parameter, the peripheral ring Border parameter includes temperature, humidity, alcohol content etc. in air, is used according to the surrounding enviroment parameter regulation master controller detected In the parameter current sets of threshold values for judging whether alarm, so that parameter current sets of threshold values can adapt to the air weather in location, into And reduce the probability of wrong report.

Since areal is different in the flow of the people of different periods, need use tighter in the flow of the people biggish period Therefore, in master controller the parameter threshold group of lattice stores multiple groups parameter threshold as the judgment criteria for whether having dangerous situation to occur Group, driver choose suitable parameter threshold group as parameter current sets of threshold values, thus driver by driver's cabin control panel Parameter current sets of threshold values can be manually selected, is adjusted more flexible.

It should be noted that above-described embodiment can be freely combined as needed.The above is only of the invention preferred Embodiment, it is noted that for those skilled in the art, in the premise for not departing from the principle of the invention Under, several improvements and modifications can also be made, these modifications and embellishments should also be considered as the scope of protection of the present invention.

Claims (12)

1. a kind of public transport safety early warning system based on wireless Internet of Things characterized by comprising

Bus door safety check apparatus at the car door of bus is set, multiple dangerous material for being arranged in bus detect automatically Device, be arranged at bus door close to switch, driver's cabin control panel and master controller, multiple dangerous material are examined automatically It surveys device and is set to the different location in bus, it is described to connect close to switch, driver's cabin control panel with the master controller It connects；

The bus door safety check apparatus includes:

Blower bar and detection bar, the blower bar and detection bar are separately positioned on the car door two sides of bus；

The detection bar includes:

Detection bar shell and two the second exhaust fans being arranged in the detection bar shell, two second exhaust fans along Vertical direction arrangement, the air for the outside that second exhaust fan will test bar shell are pumped into the inside of the detection bar shell；

Rectifying air duct, the rectification air duct includes a chimney fan and two air intake passages, and wherein the one of two air intake passages End is connected to the chimney fan and is located at the ipsilateral of the chimney fan, and the air intake passage is along its axis direction in bending One end of shape, the separate chimney fan of air intake passage is connected to the air outlet of the second exhaust fan；

Air detector module, the air detector module is arranged in the detection bar shell and the separate air inlet of the chimney fan The one end in channel directs the air to be detected at the air detector module；

The blower bar includes two pressure fan that air is blowed to detection bar, the air outlet face corresponding position of the pressure fan The air intake vent of second exhaust fan at place；

The dangerous material automatic detection device includes:

Upper cover and bottom plate, the upper cover are detachably connected with bottom plate, and the upper cover and bottom plate constitute an accommodation space；

First exhaust fan, first exhaust fan are set in the accommodation space, and the upper cover corresponds to first exhausting Suction opening is offered at machine；

Wind guide channel, the wind guide channel are located in the accommodation space, the wind guide channel include the first air dam interconnected with Second air dam, the air outlet of the first exhaust fan described in one end face of first air dam far from the second air dam are described First air dam and bottom plate constitute the first sub-air channel, and second air dam and bottom plate constitute the second sub-air channel, first son The extending direction in air duct favours the extending direction of second sub-air channel, and the bottom plate, which corresponds to, is equipped with bottom plate at the wind guide channel Ventilation opening；

Semiconductor transducer plate, the semiconductor transducer plate are located at first air dam at first exhaust fan；

Main control board and alarm device, the main control board and alarm device are located in the accommodation space, the master control Circuit board respectively with semiconductor transducer plate, alarm device, the first exhaust fan communication connection；

Antenna, the antenna is rotatably dispose on the upper lid and the antenna and the main control board communication connection；

The master controller respectively with all second exhaust fans, all pressure fan communication connections, and the master control Device passes through the corresponding antenna communication connection, any two with the main control board of each dangerous material automatic detection device The danger automatic detection device passes through corresponding antenna communication connection.

2. the public transport safety early warning system according to claim 1 based on wireless Internet of Things, it is characterised in that: described first leads Wind portion and the second air dam are arranged on the bottom plate；

First air dam includes sequentially connected first wind deflector, incline plate and the second wind deflector, first wind deflector with Second wind deflector is parallel to each other, and the plate that inclines is tilted along the direction far from the first exhaust fan towards bottom plate, first wind-guiding Plate one end and second wind deflector far from the plate that inclines are set on the bottom plate far from the one end for the plate that inclines；

The corresponding position of first wind deflector and the second wind deflector is equipped with a pair of of clamping flange, a pair of clamping flange court Extend to direction close to each other, and the clamping flange extends close to one end of bottom plate towards the plate that inclines；

The both ends of the semiconductor transducer plate are respectively provided with a clamping block, the clamping block be arranged in the clamping flange of respective side with Incline between plate.

3. the public transport safety early warning system according to claim 2 based on wireless Internet of Things, it is characterised in that: described second leads Wind portion includes third wind deflector, and the edge of the third wind deflector extends towards bottom plate constitutes vertical plate, and the vertical plate is separate One end of the third wind deflector is set on the bottom plate；

The extending direction for extending perpendicularly to second sub-air channel of first sub-air channel.

4. the public transport safety early warning system according to claim 2 based on wireless Internet of Things, it is characterised in that: on the bottom plate Equipped with draught deflector, the draught deflector is located between the air outlet and the semiconductor transducer plate of first exhaust fan.

5. the public transport safety early warning system according to claim 1 based on wireless Internet of Things, it is characterised in that: the blower bar The first fixed plate for further including blower bar shell and being arranged in the blower bar shell, two blower settings are described In first fixed plate；

Petal nozzle is equipped at the air outlet of the pressure fan, the petal nozzle includes interconnected deformation air duct and petal Spray head, the deformation air duct are connected in the air outlet of the pressure fan far from one end of petal spray head, and the petal spray head is separate The one end in deformation air duct is stretched out the blower bar shell and is fixed on blower bar shell by petal fixed plate；

Along the direction that air flows, the cross sectional shape in the deformation air duct is gradually changed from rectangle to circle, the deformation wind Road is equal with the area of section at the rounded place in deformation air duct in the area of section at rectangle；

Along the direction that air flows, the cross sectional shape of the petal spray head is described gradually from circle to petal change in shape The area of section at the rounded place of petal spray head is in that the area of section at petal place is equal with the petal spray head, the petal spray head It is equal in the angle between the center line of the adjacent two panels petal in the section at petal place；

The petal spray head is in the height of the every petal in the section at petal place and the widest part of the every petal The ratio of length is between 1~1.5.

6. the public transport safety early warning system according to claim 1 based on wireless Internet of Things, it is characterised in that: the detection bar It further include the second fixed plate, second fixed plate is set to the inside of the detection bar shell, two second exhaust fans It is arranged in second fixed plate with air detector module；The chimney fan is cylindrical shape, and two air intake passages are in The side of the chimney fan is arranged in divergent shape；

The chimney fan passes through second fixed plate and is fixed in second fixed plate, and two air intake passages are located at Second fixed plate it is ipsilateral；

The detection bar further includes wind deflector, and the wind deflector is arranged in second fixed plate；

The cross sectional shape of the wind deflector is U-shaped, and along the extending direction of the wind deflector, the first end of the wind deflector is envelope The second end of closed end, the wind deflector is open end, and air-guiding aisle is constituted between the wind deflector and the second fixed plate, described to lead The first end in wind channel is connected to the chimney fan, air detector module described in the second end face of the air-guiding aisle；

It is equipped with a barrier in the chimney fan, the inside of the chimney fan is divided into two air ducts by the barrier, and respectively first Air duct and the second air duct, first air duct is connected to an air intake passage respectively with the second air duct.

7. the public transport safety early warning system according to claim 1 based on wireless Internet of Things, it is characterised in that: described second takes out Be equipped with wind scooper at the suction opening of blower and at the air intake vent of pressure fan, the surface of the wind scooper be it is coarse, it is described to lead Fan housing includes wall surface in bottomless bowl structure and the wind scooper, and the lesser one end of the bore of the wall surface is wind scooper outlet air Mouthful, the biggish one end of the bore of the wall surface is wind scooper air intake vent；

The wind scooper air outlet of the wind scooper at second exhaust fan is connect with the suction opening of the second exhaust fan, position The wind scooper air intake vent of the wind scooper at second exhaust fan is flushed with the detection bar shell；

The wind scooper air outlet of the wind scooper at the pressure fan and the air intake vent of pressure fan connect, and send positioned at described The wind scooper air intake vent of the wind scooper at blower is flushed with the blower bar shell；

The diameter of section of the wind scooper air intake vent is d, and the diameter of section of the wind scooper air outlet is D, and the radius ratio of D/d exists Between 1.5~2；The wall surface along the diameter of section d of length H and wind scooper air intake vent on itself axis direction ratio Between 0.75~1；The ratio of the diameter of section d of the radius of curvature R and wind scooper air intake vent of the wall surface is between 1.5~2.

8. a kind of method for early warning, applied to the public transport safety early warning system described in claim 1 based on wireless Internet of Things, driver's cabin Control panel is equipped with the touch screen for interaction, which comprises the steps of:

When the semiconductor transducer plate of any one dangerous material automatic detection device detects dangerous situation, the corresponding dangerous material The main control board of automatic detection device by antenna by dangerous situation information be transferred to other all dangerous material automatic detection devices with And at master controller, the alarm device and the same alarm of master controller of all dangerous material automatic detection devices；

The open command that sends close to after switch triggering is to the touch screen on master controller or the driver's cabin control panel After receiving open command, open command is transferred to master controller, the master controller control by the driver's cabin control panel The second exhaust fan, pressure fan and the air detector module of bus door safety check apparatus start operation, and air detector module will test For the transmission of feedback information arrived to master controller, the feedback information is security information or dangerous information, and master controller identifies institute State feedback information；

When the feedback information is dangerous information, master controller is alarmed by the touch screen of driver's cabin control panel to driver；

When the feedback information is security information, master controller, which controls air detector module, the second exhaust fan and pressure fan, to be stopped Detection.

9. method for early warning according to claim 8, which is characterized in that further comprise the steps of:

Its corresponding real time status information is transferred to master controller with all pressure fan by all second exhaust fans, always Controller identifies the real time status information；

It described is sent when the master controller judges to obtain all second exhaust fans according to the real time status information with all When blower operates normally, the master controller does not do any operation；

When the master controller judges to obtain any one of second exhaust fan or air-supply according to the real time status information Machine is when in an abnormal state, and the master controller controls all second exhaust fans and all pressure fan are out of service simultaneously It alarms to driver.

10. method for early warning according to claim 8, it is characterised in that:

The dangerous situation information includes the dangerous material automatic detection device position and dangerous situation generation information at dangerous situation generation position；

After master controller receives dangerous situation information, the dangerous material at position are occurred for the dangerous situation received certainly by the master controller Motion detection device location transmission is to driver's cabin control panel and is shown on the touchscreen, and the master controller will receive Dangerous situation occur information be shown on driver's cabin control panel with prompt driver's dangerous situation occur.

11. method for early warning according to claim 8, which is characterized in that further comprise the steps of:

When within a preset period of time, the number of master controller wrong report dangerous situation reaches preset quantity, then passes through bus door installation dress Detection chip on the main control board of the air detector module and dangerous material automatic detection device set obtains surrounding enviroment parameter, And it is used to judge whether the parameter current sets of threshold values of alarm according to the surrounding enviroment parameter regulation master controller.

12. method for early warning according to claim 11, it is characterised in that:

Multiple groups parameter threshold group is stored in master controller, driver chooses suitable parameter threshold by driver's cabin control panel Group is used as the parameter current sets of threshold values.