CN111077049A - Portable β ray method particulate matter concentration monitoring system - Google Patents
Portable β ray method particulate matter concentration monitoring system Download PDFInfo
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- CN111077049A CN111077049A CN201911375131.7A CN201911375131A CN111077049A CN 111077049 A CN111077049 A CN 111077049A CN 201911375131 A CN201911375131 A CN 201911375131A CN 111077049 A CN111077049 A CN 111077049A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2273—Atmospheric sampling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
Abstract
The invention relates to the technical field of atmospheric environment monitoring, in particular to a portable β ray method particulate matter concentration monitoring system, which comprises a cutter, a sampling system, a dynamic heating system, a case, a β ray detection system integrated in the case, a filter paper belt transmission system, a touch display screen, a main frame, a main control board and a drive board.
Description
Technical Field
The invention relates to the field of environmental monitoring equipment, in particular to a portable β ray method particulate matter concentration monitoring system.
Background
The existing apparatus for monitoring the mass concentration of the atmospheric particles has various principles, including a gravimetric method, a micro-oscillation balance method, an β ray method, a light scattering method and the like, the gravimetric method is the most direct and reliable method for monitoring the particle concentration, and has the problem that the measurement speed is too slow, the method takes at least several hours.
In order to overcome the defects, a portable β ray method particulate matter concentration monitoring system is urgently needed to be designed to meet the requirement of long-term online monitoring of atmospheric particulate matters under severe outdoor working conditions.
The invention aims to provide a portable β ray method particulate matter concentration monitoring system which can solve the defects of the prior art, meet the requirement of on-line monitoring of atmospheric particulate matter under severe outdoor working conditions and realize long-term continuous real-time monitoring.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a portable β ray method particulate matter concentration monitoring system is characterized by comprising a case, a sampling system, a filter paper belt transmission system, a β ray detection system and a main control board, wherein the sampling system, the filter paper belt transmission system, the β ray detection system and the main control board are integrated on the case, and the system comprises:
the sampling system comprises a gas suction unit, a flowmeter and a cutter, wherein the inlet end of the cutter is communicated with the external space of the case, the gas suction unit is communicated with the outlet end of the cutter through a pipeline, the cutter introduces sample gas to be detected containing particles from the atmosphere outside the case by the gas suction unit, the particles are cut by the cutter and then are finally sucked into the gas suction unit along with the sample gas to be detected, the flowmeter is communicated and arranged in the pipeline, and the flowmeter detects the flow rate of the sample gas to be detected sucked by the gas suction unit;
the filter paper belt transmission system is used for storing and transmitting filter paper belts;
β ray detection system includes air flue unit, β ray source and scintillator detector, the air flue unit has air flue, one side of air flue unit has open face, the open face makes the partial or whole air flue in the air flue unit correspond to the side to open, the air flue of the air flue unit is connected into the pipeline of the sampling system through its inlet, outlet end intercommunication, the open face of the air flue unit is covered and sealed by the filter paper belt that transmits in the filter paper belt transmission system, make the particulate matter in the sample gas to be measured that flows through the air flue and flows through the filter paper enrich to the filter paper belt and form the particulate matter dust spot, β ray source, scintillator detector are installed on air flue unit separately, and the filter paper belt passes through between β ray source, scintillator detector;
the main control board is respectively electrically connected with the scintillator detector and the flowmeter, and is also in control connection with the β ray source, β rays emitted by the β ray source penetrate through the filter paper tape and are received by the scintillator detector, β ray intensity I0 of β rays penetrating through the filter paper tape when the filter paper tape does not have dust spots before particulate matter enrichment is obtained through the scintillator detector, β ray intensity I1 of β rays penetrating through the filter paper tape when the filter paper tape has dust spots after particulate matter enrichment is obtained, mass m of the particulate matter enriched in the dust spots on the filter paper tape and attenuation of β ray intensity after β radiation penetrates through the filter paper tape conform to the Bolby's law, and the concentration of the particulate matter can be calculated by combining the volume of the sample gas to be detected collected by the sampling system.
The portable β ray method particulate matter concentration monitoring system is characterized in that the cutter is any one of a TSP cutter, a PM10 cutter, a PM2.5 cutter and a PM1 cutter.
The portable β ray method particulate matter concentration monitoring system is characterized in that the sampling system further comprises a sampling tube, a sampling tube adaptor, a flow control valve, an outdoor temperature and humidity sensor and an atmospheric pressure sensor, wherein a gas suction unit in the sampling system is composed of a vacuum pump, the sampling tube adaptor is fixed on the side wall of a case, one end of the sampling tube adaptor is exposed out of the case, the other end of the sampling tube adaptor extends into the case, the sampling tube and a cutter are respectively arranged outside the case, one end of the sampling tube is inserted and communicated to one end of the sampling tube adaptor exposed out of the case, the outlet end of the cutter is communicated with the other end of the sampling tube, one end of the sampling tube adaptor extending into the case is communicated with an air passage inlet end in an air passage unit in a β ray detection system through a pipeline, the air passage outlet end is communicated with an inlet of a flow meter through a pipeline, an outlet of the flow meter is communicated with an inlet of the flow control valve through a pipeline, an outlet of the flow control valve is communicated with a suction port of the vacuum pump through a pipeline, the outdoor temperature and humidity sensor and the atmospheric pressure sensor are respectively;
the main control board controls the vacuum pump to provide sampling power for the sampling system; the main control board adjusts the opening of the flow control valve in real time through real-time monitoring data of the flow measured by the flowmeter, so that the control of sampling flow is realized; the outdoor temperature and humidity sensor measures the temperature and humidity value of the external environment, the atmospheric pressure sensor measures the atmospheric pressure value of the external environment, and the temperature, humidity value and atmospheric pressure value of the external environment are collected to the main control board.
The portable β ray method particulate matter concentration monitoring system is characterized by further comprising a dynamic heating system, wherein the dynamic heating system comprises a heater, a sampling tube wall temperature sensor and a sampling gas temperature and humidity sensor, the heater is wrapped on the outer wall of a sampling tube of the sampling system, the sampling tube wall temperature sensor is mounted on the tube wall of the sampling tube, the sampling gas temperature and humidity sensor is mounted in an air passage of an air passage unit in the β ray detection system, the sampling tube wall temperature sensor and the sampling gas temperature and humidity sensor are respectively and electrically connected with a main control board, the main control board is further in control connection with the heater, and the main control board dynamically adjusts heating power of the heater according to the sampling tube wall temperature and the sampling gas temperature and humidity data collected by the sampling tube wall temperature sensor and the sampling gas temperature and humidity sensor and achieves dynamic monitoring and control of temperature and humidity of sampling gas flow.
The portable β ray method particulate matter concentration monitoring system is characterized in that the β ray detection system further comprises a movable plate, a compression spring, a support and a detection module constant temperature system, an air passage unit in the β ray detection system is composed of an upper air passage seat and a lower air passage seat, air passages are arranged in the upper air passage seat and the lower air passage seat, an outlet end of the air passage in the upper air passage seat is communicated with an inlet end of the air passage in the lower air passage seat, an inlet end of the air passage in the upper air passage seat is communicated with one end, extending into a case, of a sampling tube adapter through a pipeline, an outlet end of the air passage in the lower air passage seat is communicated with an inlet of a flow meter through a pipeline, the upper air passage seat has an open surface facing the lower air passage seat, the open surface enables part or all of the air passages in the upper air passage to be open, a filter paper belt transmitted by a transmission system penetrates through the upper air passage seat and the lower air passage seat and covers the open surface of the lower air passage seat, the upper air passage seat and the lower air passage seat, the support is connected between the upper air passage seat and the lower air passage seat to form an integral structure, the upper air passage seat, the radiation source and the lower air passage seat are connected with a scintillation gas passage seat through the compression spring, the upper air passage seat, the working temperature detection system, the working temperature detector is controlled by a scintillation gas heater, the working temperature detector is controlled by the scintillation gas heater, the working temperature detector is controlled by the working temperature detector, the working temperature detector is controlled by the working temperature detector.
The portable β ray method particulate matter concentration monitoring system is characterized in that the filter paper tape transmission system comprises a paper collecting wheel, a paper supply wheel, a guide wheel, a filter paper tape step control wheel, a paper feeding motor, a lifting motor, a paper feeding optocoupler, a lifting optocoupler I, a lifting optocoupler II, a lifting optocoupler baffle and a paper feeding optocoupler baffle, wherein the paper collecting wheel, the paper supply wheel, the guide wheel, the filter paper tape step control wheel, the paper feeding motor, the lifting motor, the paper feeding optocoupler, the lifting optocoupler I, the lifting optocoupler II, the lifting optocoupler baffle and the paper feeding optocoupler baffle are all arranged on a main frame in a case, and a β ray detection system is also arranged on the main frame in the case, wherein:
the paper feeding wheel is coaxially sleeved with a paper filtering disc, the paper filtering belt is led out from the paper filtering disc, sequentially bypasses the outer surface of the guide wheel, passes through the β ray detection system, then bypasses the outer surface of the step length control wheel of the paper filtering belt, and is finally fixed on the outer surface of the paper receiving wheel;
the paper feeding device comprises a paper feeding motor, a lifting optical coupler blocking piece, a paper collecting wheel, a paper filtering tape, a paper feeding motor, a main control system and a lifting optical coupler control wheel, wherein an output shaft of the paper feeding motor is fixedly connected with the center of the paper collecting wheel, the lifting motor is used for controlling the lifting and descending of the movable plate, the lifting optical coupler blocking piece is fixed on a rotating shaft of the lifting motor and can rotate along with the rotation of the lifting motor, a slit is formed in the lifting optical coupler blocking piece, the position of the slit can be detected by the lifting optical coupler I and the lifting optical coupler II, so that the movable plate can stop rotating when reaching a lifting limit position and a descending limit position through the lifting motor, the paper filtering tape can horizontally move under the driving of the paper feeding motor when the movable plate is at a lower limit position, the paper filtering tape can rotate through the paper filtering tape step size control wheel when moving, the paper filtering tape is fixed on the paper feeding optical coupler blocking piece and can rotate along with the paper feeding wheel, the paper feeding optical coupler blocking piece is provided with uniformly distributed slits, the paper feeding optical coupler blocking piece can detect the positions of the slits and the number of the slits when the paper feeding wheel and the paper feeding wheel, so that the paper feeding system is not connected with the lifting optical coupler β when the lifting optical coupler motor and the paper feeding motor are respectively.
The portable β ray method particulate matter concentration monitoring system is characterized in that a chassis is further integrated with a drive board, the drive board is integrated with a vacuum pump drive module, a heater drive module, a flow control valve drive module and a motor drive module, the main control board is in control connection with a vacuum pump through the vacuum pump drive module, is in control connection with each heater through the heater drive module, is in control connection with the flow control valve through the flow control valve drive module, and is in control connection with each motor through the motor drive module.
The portable β ray method particulate matter concentration monitoring system is characterized by further comprising a touch display screen integrated on the surface of the case, wherein the touch display screen is electrically connected with the main control board, so that control over the system and data display are achieved.
The portable β ray method particulate matter concentration monitoring system is characterized in that a cooling fan and a power module main switch are integrated in a case, the cooling fan is used for cooling the inner space of the case, the power module is used for supplying power to all power utilization parts in the system, and the main switch is used for controlling starting and stopping of the system.
Compared with the existing on-line measuring equipment, the on-line measuring equipment is mainly applied to urban air quality detection stations and all standard station rooms matched with the urban air quality detection stations need to be built. They are either bulky and expensive or the measurement results are greatly influenced by the ambient temperature, humidity and particulate matter components, and are not suitable for long-term operation under severe outdoor conditions.
The invention has the beneficial effects that:
the portable β ray method particulate matter concentration monitoring system is based on the β ray method principle, is highly integrated, is convenient to carry and install, can meet the requirement of long-term online monitoring of atmospheric particulate matter under severe outdoor working conditions, has the characteristic of high ray method measurement accuracy, can be used as standard reference of various field devices, integrates a measurement part and a sampling pump in a case with a cooling fan, effectively reduces the volume of the device, enables the device to be convenient to carry and stable in severe environment, and simultaneously enables the device to independently operate outdoors due to the miniaturized design of the instrument, thereby greatly reducing the cost.
Drawings
FIG. 1 is a schematic block diagram of a portable β -ray method particulate matter concentration monitoring system
FIG. 2 is a schematic diagram of a portable β ray method particulate matter concentration monitoring system structure
FIG. 3 is a schematic diagram of the rear view of the structure of a portable β ray method particulate matter concentration monitoring system
FIG. 4 is a schematic structural diagram of the internal structure of a portable β ray method particulate matter concentration monitoring system
The reference numbers in the figure are cutter 1, dynamic heating system 2, sampling tube 3, machine case 4, scintillator detector 5, paper collecting wheel 6, upper air channel seat 7, step control wheel 8 of filter paper tape, β ray source 9, main frame 10, main control board 11, drive board 12, vacuum pump 13, fan heater 14, paper supply wheel 15, guide wheel 16, sampling tube adaptor 17, outdoor temperature and humidity sensor 18, paper feeding motor 19, paper feeding optical coupler 20, paper feeding optical coupler stop 21, lifting optical coupler one 22, lifting optical coupler two 23, lifting motor 24, lifting optical coupler stop 25, flow control valve 26, flowmeter 27, compression spring 28, sample gas temperature and humidity sensor 29, power module 30, touch display screen 31, main switch 32, movable board 33, paper filtering tape 34, air inlet bent tube 35, support column 36, lower air channel seat 37, atmospheric pressure sensor 38 and detection module constant temperature system 39.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1-4, a schematic block diagram of a portable β ray particulate matter monitoring system comprises a touch display screen, a sampling system, a dynamic heating system, a β ray detection system, a filter paper belt transmission system, a main control board, a drive board and the like;
the sampling system comprises a sampling tube 3, a flow meter 27, a flow control valve 26, a vacuum pump 13, a PU hose, an outdoor temperature and humidity sensor 18 and an atmospheric pressure sensor 38, wherein the upper end of the sampling tube 3 is connected with the cutter 1, the lower end of the sampling tube 3 is inserted into a sampling tube adapter 17 fixed on the chassis, a sampling gas flow enters an air inlet elbow 35 of the β ray detection system through the sampling tube adapter 17 and flows through the filter paper tape 34, the sampling gas flow is connected to an inlet of the flow meter 27 through the PU hose, an outlet of the flow meter 27 is fixed to an inlet of the flow control valve 26 through threaded connection, an outlet of the flow control valve 26 is connected to the vacuum pump 13 through the PU hose, the vacuum pump 13 provides sampling power of the sampling system, the sample gas to be detected in the atmosphere continuously enters the sampling system, the cut particulate matters are enriched on the flow control valve 34 to form particulate matter dust spots under the action of the sampling system, the sampling system monitors the flow measured by the flow meter 17 in real time through a main control board 11 and a driving board 12, the opening of the flow control valve 26 is adjusted in real time, the sampling system is used as a particulate matter temperature and humidity sensor β operating temperature and humidity sensor under the atmospheric pressure measuring condition under the portable atmospheric pressure measuring method, the atmospheric pressure measuring method under the atmospheric pressure measuring method 3516, the atmospheric pressure measuring method under the atmospheric pressure measuring method β.
The cutter 1 can be a TSP cutter, a PM10 cutter, a PM2.5 cutter and a PM1 cutter, and the concentration of different types of particulate matters can be measured by connecting different cutters.
The β ray detection system comprises a β ray source 9 and a scintillator detector 5, the filter paper strip 34 penetrates through the β 0 ray detection system and is located between the β 1 ray source 9 and the scintillator detector 5, the scintillator detector 5 in the β 2 ray detection system can detect the ray intensity I964 of the β ray source penetrating through the 894 ray intensity I0 of the filter paper strip 34 when no dust spot exists before the filter paper strip 34 is enriched with particles, the ray intensity attenuation of the ray intensity I0 of the β ray intensity after the filter paper strip 34 is enriched with particles meets the Lambert beer's law when the filter paper strip 34 is enriched with particles, the concentration of the particles can be calculated by combining the volume of the sample gas collected by a sampling system when the filter paper strip penetrates through the dust spot, the β ray detection system further comprises an air inlet ray source 35, an upper air duct seat 7, a lower air duct seat 37, a lower air duct seat screw seat of the upper air suction duct seat 34 is located between the upper air duct seat and the lower air duct seat 9, the upper air duct seat of the scintillator detector 34, the upper air duct seat 9, the lower air duct seat is located between the upper air duct seat 9 and the lower air duct seat of the scintillator detection system, the upper air duct seat 9, the lower air duct seat 9 is located between the lower air duct seat 9, the upper air duct seat of the lower air detection system, the upper air duct detection system is located between the lower air duct detection system, the upper air duct detection system is located between the lower air duct detection system, the upper air duct detection system, the lower air detection system is located between the upper air duct detection system, the lower air duct detection system, the upper air duct detection system 9 and the lower air duct detection system, the upper air detection system is located between the lower air duct detection system, the lower air duct detection system 9, the upper air duct detection system, the lower air duct detection system, the upper air duct detection system is located between the lower air duct detection system.
Further, the detection module thermostat system 39 includes a heater and a temperature sensor, and the heater and the temperature sensor are installed in the installation hole of the upper airway seat. The detection module constant temperature system can ensure the constancy of the ambient temperature of the scintillator detector 5 during working in the detection process, so that the counting stability is higher, and the monitored particulate matter concentration is more accurate and reliable.
The dynamic heating system 2 comprises a heater, a sampling pipe wall temperature sensor and a sampling gas temperature and humidity sensor; the heater is coated on the outer wall of the sampling pipe of the sampling system and can heat the sampling pipe, so that the sampling gas flowing through the sampling pipe is heated; the heater can be a heating plate or a heating belt; the dynamic heating system 2 can dynamically adjust the heating power of the heater according to the wall temperature and the sample temperature and humidity acquired by the sampling pipe wall temperature sensor and the sampling gas temperature and humidity sensor, so that the temperature and humidity of the sampling gas flow can be dynamically monitored and controlled.
Further, the filter paper strip 34 is wound into a disk-shaped filter paper tray before use;
the paper tape transmission system comprises a paper collecting wheel 6, a paper feeding wheel 15, a guide wheel 16, a filter paper tape step length control wheel 8, a paper feeding motor 19, a lifting motor 24, a paper feeding optical coupler 20, a lifting optical coupler I22, a lifting optical coupler II 23, a lifting optical coupler blocking piece 25 and a paper feeding optical coupler blocking piece 21, wherein the paper collecting wheel 6, the paper feeding wheel 15, the guide wheel 16, the filter paper tape step length control wheel 8, the paper feeding motor 19, the lifting motor 24, the paper feeding optical coupler 20, the lifting optical coupler I22, the lifting optical coupler II 23, the lifting optical coupler blocking piece 25 and the paper feeding optical coupler blocking piece 21 are all arranged at corresponding positions on the main frame, the filter paper disc is arranged on the paper feeding wheel 15, the filter paper tape 34 is led out from the filter paper disc and sequentially wound on the outer surface of the guide wheel 16, penetrates through the β ray detection system and is wound on the outer surface of the filter paper tape control wheel 8 and finally fixed on the outer surface of the paper collecting wheel 6 when the filter paper tape lifting optical coupler blocking piece 34 and the filter paper tape feeding wheel 34 reaches the limit paper tape step length control wheel 7, the limit position, the lifting optical coupler optical;
further, the touch display screen 31 is electrically connected to the main control board 11, so as to implement control of the system and display of data;
further, the main control board 11 is electrically connected to all the sensors and the driving board 12, so as to realize the acquisition of system data and the control of the test process;
further, the driving board 12 is electrically connected to the flow control valve 26, the vacuum pump 13, the paper feeding motor 19 and the lifting motor 24, and together with the main control board 11, controls the flow control valve 26, the vacuum pump 13, the paper feeding motor 19 and the lifting motor 24;
further, the case 4 includes a heat dissipation fan 14, a power module 30, and a main switch 32; the heat dissipation fan 14 is used for dissipating heat in the internal space of the chassis 4, the power module 30 is used for supplying power to the system, and the main switch 32 is used for controlling the start and stop of the system.
Furthermore, the sampling pump 13 is integrated inside the case, so that the equipment can be conveniently carried and installed.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (9)
1. A portable β ray method particulate matter concentration monitoring system is characterized by comprising a case, a sampling system integrated on the case, a filter paper belt transmission system, a β ray detection system and a main control board, wherein:
the sampling system comprises a gas suction unit, a flowmeter and a cutter, wherein the inlet end of the cutter is communicated with the external space of the case, the gas suction unit is communicated with the outlet end of the cutter through a pipeline, the cutter introduces sample gas to be detected containing particles from the atmosphere outside the case by the gas suction unit, the particles are cut by the cutter and then are finally sucked into the gas suction unit along with the sample gas to be detected, the flowmeter is communicated and arranged in the pipeline, and the flowmeter detects the flow rate of the sample gas to be detected sucked by the gas suction unit;
the filter paper belt transmission system is used for storing and transmitting filter paper belts;
β ray detection system includes air flue unit, β ray source and scintillator detector, the air flue unit has air flue, one side of air flue unit has open face, the open face makes the partial or whole air flue in the air flue unit correspond to the side to open, the air flue of the air flue unit is connected into the pipeline of the sampling system through its inlet, outlet end intercommunication, the open face of the air flue unit is covered and sealed by the filter paper belt that transmits in the filter paper belt transmission system, make the particulate matter in the sample gas to be measured that flows through the air flue and flows through the filter paper enrich to the filter paper belt and form the particulate matter dust spot, β ray source, scintillator detector are installed on air flue unit separately, and the filter paper belt passes through between β ray source, scintillator detector;
the main control board is respectively electrically connected with the scintillator detector and the flowmeter, and is also in control connection with the β ray source, β rays emitted by the β ray source penetrate through the filter paper tape and are received by the scintillator detector, β ray intensity I0 of β rays penetrating through the filter paper tape when the filter paper tape does not have dust spots before particulate matter enrichment is obtained through the scintillator detector, β ray intensity I1 of β rays penetrating through the filter paper tape when the filter paper tape has dust spots after particulate matter enrichment is obtained, mass m of the particulate matter enriched in the dust spots on the filter paper tape and attenuation of β ray intensity after β radiation penetrates through the filter paper tape conform to the Bolby's law, and the concentration of the particulate matter can be calculated by combining the volume of the sample gas to be detected collected by the sampling system.
2. The portable β ray-method particulate matter concentration monitoring system according to claim 1, wherein the cutter is any one of a TSP cutter, a PM10 cutter, a PM2.5 cutter, and a PM1 cutter.
3. The portable β ray-method particulate matter concentration monitoring system according to claim 1, wherein the sampling system further comprises a sampling tube, a sampling tube adaptor, a flow control valve, an outdoor temperature and humidity sensor, and an atmospheric pressure sensor, wherein a gas pumping unit in the sampling system is composed of a vacuum pump, the sampling tube adaptor is fixed on a side wall of the chassis, one end of the sampling tube adaptor is exposed outside the chassis, and the other end of the sampling tube adaptor extends into the chassis, the sampling tube and the cutter are respectively arranged outside the chassis, one end of the sampling tube is inserted and communicated to one end of the sampling tube adaptor exposed outside the chassis, an outlet end of the cutter is communicated with the other end of the sampling tube, one end of the sampling tube adaptor extending into the chassis is communicated with an inlet end in an air passage unit in the β ray detection system through a pipeline, an outlet end of the air passage is communicated with an inlet of the flow meter through a pipeline, an outlet of the flow meter is communicated with an inlet of the flow control valve through a pipeline, an outlet of the flow control valve is communicated with a pumping port of the vacuum pump through a pipeline, the outdoor temperature and atmospheric pressure sensor are respectively arranged on an outer side;
the main control board controls the vacuum pump to provide sampling power for the sampling system; the main control board adjusts the opening of the flow control valve in real time through real-time monitoring data of the flow measured by the flowmeter, so that the control of sampling flow is realized; the outdoor temperature and humidity sensor measures the temperature and humidity value of the external environment, the atmospheric pressure sensor measures the atmospheric pressure value of the external environment, and the temperature, humidity value and atmospheric pressure value of the external environment are collected to the main control board.
4. The portable β ray-method particulate matter concentration monitoring system according to claim 3, further comprising a dynamic heating system, wherein the dynamic heating system includes a heater, a sampling tube wall temperature sensor, and a sampling gas temperature and humidity sensor, wherein the heater covers an outer wall of a sampling tube of the sampling system, the sampling tube wall temperature sensor is mounted on a wall of the sampling tube, the sampling gas temperature and humidity sensor is mounted in an air passage of an air passage unit in the β ray detection system, the sampling tube wall temperature sensor and the sampling gas temperature and humidity sensor are respectively electrically connected with the main control board, the main control board is further in control connection with the heater, and the main control board dynamically adjusts heating power of the heater according to sampling tube wall temperature and to-be-detected sample gas temperature and humidity data acquired by the sampling tube wall temperature sensor and the sampling gas temperature and humidity sensor, thereby realizing dynamic monitoring and control of temperature and humidity of the sampling gas flow.
5. The system for monitoring the concentration of particulate matter by a portable β -ray method according to claim 1, wherein the β -ray detection system further comprises a movable plate, a compression spring, a pillar, a detection module thermostatic system, an air passage unit in the β -ray detection system comprises an upper air passage seat and a lower air passage seat, air passages are respectively arranged in the upper and lower air passage seats, an outlet end of the air passage in the upper air passage seat is communicated with an inlet end of the air passage in the lower air passage seat, an inlet end of the air passage in the upper air passage seat is communicated with one end of a sampling tube adapter extending into a case through a pipeline, an outlet end of the air passage in the lower air passage seat is communicated with an inlet of a flow meter through a pipeline, the upper air passage seat has an open surface facing the lower air passage seat, the open surface opens a part or all of the air passages in the upper air passage seat, a filter paper belt transmission system transmits through the upper and lower air passage seats and covers the open surface of the upper air passage seat, the upper and lower air passage seat, the pillar connects the upper and lower air passage seat to form an integral structure, the upper and lower air passage seat through the compression spring, the lower air passage seat, the heater, the upper air passage seat, the heater and the upper air passage seat is connected to the upper air passage seat, the lower air passage seat, the upper air passage.
6. The portable β ray-method particulate matter concentration monitoring system according to claim 1, wherein the paper-filtering-tape transmission system comprises a paper collection wheel, a paper supply wheel, a guide wheel, a filter paper tape step control wheel, a paper feeding motor, a lifting motor, a paper feeding optocoupler, a lifting optocoupler I, a lifting optocoupler II, a lifting optocoupler baffle and a paper feeding optocoupler baffle, wherein the paper collection wheel, the paper supply wheel, the guide wheel, the filter paper tape step control wheel, the paper feeding motor, the lifting motor, the paper feeding optocoupler, the lifting optocoupler I, the lifting optocoupler II, the lifting optocoupler baffle and the paper feeding optocoupler baffle are all mounted on a main frame in a case, and the β ray detection system is also mounted on the main frame in the case, wherein:
the paper feeding wheel is coaxially sleeved with a paper filtering disc, the paper filtering belt is led out from the paper filtering disc, sequentially bypasses the outer surface of the guide wheel, passes through the β ray detection system, then bypasses the outer surface of the step length control wheel of the paper filtering belt, and is finally fixed on the outer surface of the paper receiving wheel;
the paper feeding device comprises a paper feeding motor, a lifting optical coupler blocking piece, a paper collecting wheel, a paper filtering tape, a paper feeding motor, a main control system and a lifting optical coupler control wheel, wherein an output shaft of the paper feeding motor is fixedly connected with the center of the paper collecting wheel, the lifting motor is used for controlling the lifting and descending of the movable plate, the lifting optical coupler blocking piece is fixed on a rotating shaft of the lifting motor and can rotate along with the rotation of the lifting motor, a slit is formed in the lifting optical coupler blocking piece, the position of the slit can be detected by the lifting optical coupler I and the lifting optical coupler II, so that the movable plate can stop rotating when reaching a lifting limit position and a descending limit position through the lifting motor, the paper filtering tape can horizontally move under the driving of the paper feeding motor when the movable plate is at a lower limit position, the paper filtering tape can rotate through the paper filtering tape step size control wheel when moving, the paper filtering tape is fixed on the paper feeding optical coupler blocking piece and can rotate along with the paper feeding wheel, the paper feeding optical coupler blocking piece is provided with uniformly distributed slits, the paper feeding optical coupler blocking piece can detect the positions of the slits and the number of the slits when the paper feeding wheel and the paper feeding wheel, so that the paper feeding system is not connected with the lifting optical coupler β when the lifting optical coupler motor and the paper feeding motor are respectively.
7. The portable β ray method particulate matter concentration monitoring system according to any one of claims 1-6, wherein the chassis further integrates a drive board, the drive board integrates a vacuum pump drive module, a heater drive module, a flow control valve drive module, and a motor drive module, the main control board is in control connection with the vacuum pump through the vacuum pump drive module, the main control board is in control connection with each heater through the heater drive module, the main control board is in control connection with the flow control valve through the flow control valve drive module, and the main control board is in control connection with each motor through the motor drive module.
8. The portable β ray-method particulate matter concentration monitoring system according to claim 1, further comprising a touch display screen integrated on the surface of the case, the touch display screen being electrically connected to the main control panel, thereby enabling control and data display of the system.
9. The portable β ray-method particulate matter concentration monitoring system according to claim 1, wherein a heat dissipation fan and a power module main switch are further integrated in the case, the heat dissipation fan is used for dissipating heat in the internal space of the case, the power module is used for supplying power to each power utilization part in the system, and the main switch is used for controlling starting and stopping of the system.
Priority Applications (1)
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