CN210166375U - Air pollution detection device - Google Patents

Air pollution detection device Download PDF

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Publication number
CN210166375U
CN210166375U CN201921070855.6U CN201921070855U CN210166375U CN 210166375 U CN210166375 U CN 210166375U CN 201921070855 U CN201921070855 U CN 201921070855U CN 210166375 U CN210166375 U CN 210166375U
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China
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assembly
air
component
gas collecting
gas collection
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CN201921070855.6U
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Chinese (zh)
Inventor
张彦敏
李敏姣
郭健
王玉蕊
赵阳
安平凡
宋广明
杨占昆
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Tianjin Environmental Planning Science And Technology Development Co Ltd
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Tianjin Environmental Planning Science And Technology Development Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The utility model provides an air pollution detection device, which relates to the technical field of air pollution detection and comprises a fixed component, a gas collection part, a drying component and a particulate matter detection component, wherein the gas collection part is connected with the fixed component, a gas collection cavity is arranged in the gas collection part, and the gas collection part is provided with an air inlet and an air outlet which enable the gas collection cavity to be communicated with the outside, so that the outside air can enter the gas collection cavity from the air inlet and be discharged from the air outlet, and the drying component is connected with the gas collection part and is used for drying the air in the gas collection cavity, so that the air humidity in the gas collection cavity is in a better measurement state, the particulate matter detection component can accurately detect the particulate matters in the gas collection cavity, and the technical problem that the detection device in the prior art has larger error in the detection of solid particles in a humid air environment is solved, the humidity in the gas collection cavity can be adjusted, the measurement error is small, and the application range is wide.

Description

Air pollution detection device
Technical Field
The utility model belongs to the technical field of air pollution detects technique and specifically relates to an air pollution detection device is related to.
Background
Environmental pollution in cities is becoming more serious with the development of industrial economy, and thus has become one of the major problems of general attention all over the world. The environmental pollution mainly comprises solid particles, noise and the like; with the improvement of life quality, the requirements of people on environment quality are higher and higher, the detection on the environment quality becomes important work of relevant departments immediately, and corresponding treatment measures can be taken in time only after real-time detection and timely early warning of the environment are performed.
The noise detection is easy, and related noise data can be accurately obtained through the noise detector, but the distribution of solid particles in the air is easily influenced by environments such as wind power, wind direction, temperature and humidity, the detection result error is large, for example, in sultry humid weather, the normal distribution of the solid particles is influenced to a certain extent due to large air humidity, and the measurement error of the detection device is large.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an air pollution detection device to detection device among the prior art has been alleviated and there is the technical problem of great error to the detection of solid particle under the comparatively moist environment of air.
In order to solve the technical problem, the utility model provides a technical scheme lies in:
the utility model provides an air pollution detection device, which comprises a fixed component, a gas collection part, a drying component and a particulate matter detection component;
the gas collecting part is connected with the fixed component, a gas collecting cavity is arranged in the gas collecting part, and a gas inlet and a gas outlet which enable the gas collecting cavity to be communicated with the outside are arranged on the gas collecting part;
the drying component is connected with the gas collecting part and used for drying the air in the gas collecting cavity, the particulate matter detection component is connected with the fixing component, and at least part of the particulate pollutant detection component extends into the gas collecting cavity so as to detect the particulate pollutants in the gas collecting cavity.
Further, the drying assembly comprises an electric heating sheet;
the electric heating piece is arranged in the gas collection cavity and connected with the inner wall of the gas collection part.
Further, the particulate matter detection assembly comprises a particulate matter monitor;
the particle monitor is installed on the fixed component, one side of the gas collection part is provided with an opening, and a detection probe of the particle monitor penetrates through the opening and extends into the gas collection cavity.
Further, the air pollution detection device also comprises a blower assembly;
the air blowing assembly is arranged on the fixing assembly, and an air inlet of the air blowing assembly is communicated with the air outlet, so that outside air enters the air collection cavity through the air inlet and is discharged from the air outlet.
Furthermore, a connecting pipe is arranged between the air blowing assembly and the air collecting part, the air outlet is communicated with the air inlet through the connecting pipe, and a control valve is arranged on the connecting pipe.
Further, the fixing assembly comprises a base and a stand column;
the stand with the base is connected, the top of stand is provided with noise measurement subassembly, gas collection portion with particulate matter detection subassembly all with the stand is connected, the air-blast subassembly set up in on the base.
Further, the fixing assembly further comprises a first cross arm, a second cross arm and a third cross arm;
the first cross arm, the second cross arm and the third cross arm are all connected with the stand column, an atmospheric pressure measuring assembly is arranged on the first cross arm, a wind speed and direction measuring assembly is arranged on the second cross arm, and a temperature and humidity measuring assembly is arranged on the third cross arm.
Further, the device also comprises a control component and an alarm component;
the control assembly and the alarm assembly are connected with the fixing assembly, the particulate matter detection assembly and the alarm assembly are electrically connected with the control assembly, the particulate matter detection assembly is used for transmitting the detected concentration information of the particulate pollutants into the control assembly, and the control assembly is internally preset with a concentration threshold of the particulate pollutants so as to correspondingly control the alarm assembly to send alarm information.
Further, the alarm assembly comprises an acoustic alarm unit and an indicator light unit;
the sound alarm unit and the indicator light unit are electrically connected with the control assembly.
Further, the indicator light unit includes a first indicator light, a second indicator light and a third indicator light;
the first indicator light, the second indicator light and the third indicator light are all electrically connected with the control component.
Technical scheme more than combining, the utility model discloses the beneficial effect who reaches lies in:
the utility model provides a pair of air pollution detection device, include: the device comprises a fixed component, a gas collection part, a drying component and a particulate matter detection component; because the gas collection portion is connected with the fixed subassembly, be provided with the gas collection chamber in the gas collection portion, and be provided with air inlet and the gas outlet that makes gas collection chamber and outside intercommunication on the gas collection portion, outside air can enter into the gas collection intracavity from the air inlet, and discharge from the gas outlet, because drying assembly is connected with the gas collection portion, drying assembly is used for carrying out drying process to the air in the gas collection intracavity, make the air humidity of gas collection intracavity be in the measuring state of preferred, so that particulate matter detection assembly carries out accurate detection to the particulate matter in the gas collection intracavity, the technical problem that detection device among the prior art has great error to the detection of solid particle under the comparatively humid environment of air has been alleviated, can adjust the humidity in the gas collection intracavity, measuring error is little, the range of application is wide.
Drawings
For a clear explanation of the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is an overall structure schematic diagram of an air pollution detection device provided by an embodiment of the present invention.
Icon: 100-a stationary component; 110-a base; 120-column; 130-a first cross arm; 140-a second cross arm; 150-a third crossbar; 200-a gas collecting part; 210-a gas collection chamber; 220-an air inlet; 230-air outlet; 300-a drying assembly; 400-a particulate matter detection component; 500-a blower assembly; 510-a connecting tube; 520-a control valve; 600-a noise measurement component; 610-barometric pressure measurement assembly; 620-wind speed and direction measurement assembly; 630-a temperature and humidity measurement component; 700-a control component; 800-an alarm component; 810-an alarm unit; 820-indicator light unit; 821-a first indicator light; 822-a second indicator light; 823-third indicator light.
Detailed Description
The technical solution of the present invention will be described in detail and fully with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present embodiment provides an air pollution detecting apparatus, which includes a fixing assembly 100, a gas collecting part 200, a drying assembly 300, and a particulate matter detecting assembly 400; the gas collecting part 200 is connected with the fixed assembly 100, a gas collecting cavity 210 is arranged in the gas collecting part 200, and a gas inlet 220 and a gas outlet 230 which enable the gas collecting cavity 210 to be communicated with the outside are arranged on the gas collecting part 200; the drying component 300 is connected with the gas collecting part 200 and used for drying the air in the gas collecting cavity 210, the particulate matter detecting component 400 is connected with the fixing component 100, and at least part of the particulate matter detecting component 400 extends into the gas collecting cavity 210 and is used for detecting the particulate pollutants in the gas collecting cavity 210.
Specifically, the fixing component 100 is set as a fixing support, the gas collecting part 200 is set as a square box or a cylindrical box, the drying component 300 can be set as an electric heating drying component or an adsorbate such as a desiccant, the outside air can enter the gas collecting cavity 210 from the air inlet 220 and is discharged from the air outlet 230, when the air is wet, the air in the gas collecting cavity 210 is dried by the drying component 300, the particle detection component 400 detects the dried air particles, and the measurement result is more accurate.
In the air pollution detection device provided by this embodiment, because the gas collecting portion 200 is connected to the fixed component 100, the gas collecting chamber 210 is disposed in the gas collecting portion 200, and the gas collecting portion 200 is provided with the gas inlet 220 and the gas outlet 230 communicated with the gas collecting chamber 210, external air can enter the gas collecting chamber 210 from the gas inlet 220 and be discharged from the gas outlet 230, and because the drying component 300 is connected to the gas collecting portion 200, the drying component 300 is used for drying the air in the gas collecting chamber 210, so that the air humidity in the gas collecting chamber 210 is in a better measurement state, so that the particulate matter detection component 400 can accurately detect the particulate matter in the gas collecting chamber 210, thereby alleviating the technical problem that the detection device in the prior art has a large error in detecting solid particles in a humid air environment, and being capable of adjusting the humidity in the gas collecting chamber 210, the measurement error is small, the application range is wide.
On the basis of the above embodiment, further, the drying assembly 300 in the air pollution detecting device provided by the present embodiment includes an electric heating sheet; the electric heating sheet is disposed in the gas collecting chamber 210, and the electric heating sheet is connected to the inner wall of the gas collecting portion 200.
Specifically, the plurality of electric heating plates are arranged in the gas collecting cavity 210, and can be fixed on the inner wall of the gas collecting part 200 through screws; in addition, the air pollution detection device that this embodiment provided can include solar energy component, and solar energy component includes solar cell panel and battery, and solar cell panel is with the electric energy storage that produces in the battery, and the battery passes through the wire and is connected with the electrical heating piece, provides necessary electric energy for the electrical heating piece. When the air pollution detection device is fixedly installed at a certain position, the electric heating sheet can be supplied with power through the commercial power after reasonable voltage transformation.
Further, the particulate matter detection assembly 400 includes a particulate matter monitor; the particulate matter monitor is installed on the fixed component 100, and one side of the gas collection portion 200 is provided with an opening, and a detection probe of the particulate matter monitor passes through the opening and extends into the gas collection cavity 210.
Specifically, the particle monitoring instrument can be selected from a JH-YCB type β ray particle monitoring instrument produced by a certain enterprise in Jiangsu Jihua, a low-energy C14 is used as a β ray source, the quality of the particles collected on the filter paper is calculated according to the variation when β rays pass through the filter paper and the filter paper with the particles collected, and the particle concentration in the air is obtained.
Further, the air pollution detecting apparatus further includes a blower assembly 500; the blower assembly 500 is disposed on the fixing assembly 100, and an air inlet of the blower assembly 500 is communicated with the air outlet 230, so that the external air enters the air collecting chamber 210 through the air inlet 220 and is discharged from the air outlet 230.
Specifically, the air blowing assembly 500 is configured as an air blower, an air inlet of the air blower is communicated with the air outlet 230 of the air collecting portion 200 through the connecting pipe 510, and when the air blower is operated, external air enters the air collecting chamber 210 from the air inlet 220 and is discharged from the air outlet 230 through the air blower, so as to form a circulating flow of the air flow.
Further, a connecting pipe 510 is disposed between the blower assembly 500 and the gas collecting part 200, the gas outlet 230 is communicated with the gas inlet through the connecting pipe 510, and a control valve 520 is disposed on the connecting pipe 510.
Specifically, the connecting pipe 510 is a telescopic corrugated pipe, one end of the connecting pipe 510 is arranged at the air outlet 230 of the air collecting part 200, the connecting pipe 510 is connected with the air collecting part 200, the other end of the connecting pipe 510 is communicated with an air inlet of the air blower, the control valve 520 is a V-shaped ball valve, and the V-shaped ball valve is used for controlling the on-off of an air path in the connecting pipe 510.
The air pollution detection device that this embodiment provided, the convenient air to in the gas collecting cavity 210 of electrical heating piece carries out the drying, and air-blast subassembly 500 makes the air circulate inside and outside the gas collecting cavity 210, has accelerated the circulation flow of air current for the measurement to air pollution thing is more accurate.
On the basis of the above embodiments, further, the fixing assembly 100 in the air pollution detecting apparatus provided by the present embodiment includes a base 110 and a pillar 120; the upright column 120 is connected with the base 110, the noise measuring component 600 is arranged at the top of the upright column 120, the gas collecting part 200 and the particulate matter detecting component 400 are both connected with the upright column 120, and the blower component 500 is arranged on the base 110.
Specifically, the contact area between the base 110 and the bottom surface is large so as to play a role of stable support, the upright column 120 is a hollow metal rod, the upright column 120 is welded on the base 110, and the axis of the upright column 120 is perpendicular to the plane of the base 110; the noise measurement assembly 600 is configured as a noise sensor, particularly optionally an RS-ZS series noise sensor of the family junior, for measuring noise information of the surrounding environment.
Further, the fixation assembly 100 further includes a first cross arm 130, a second cross arm 140, and a third cross arm 150; the first cross arm 130, the second cross arm 140 and the third cross arm 150 are all connected with the upright column 120, an atmospheric pressure measuring assembly 610 is arranged on the first cross arm 130, a wind speed and direction measuring assembly 620 is arranged on the second cross arm 140, and a temperature and humidity measuring assembly 630 is arranged on the third cross arm 150.
Specifically, the first cross arm 130, the second cross arm 140 and the third cross arm 150 are all provided with fixing rods with square cross sections, the atmospheric pressure measuring component 610 is provided with an atmospheric pressure sensor, and the specific model can be selected from TC0485DA of the western optical technology and is used for monitoring the atmospheric pressure value in real time; the wind speed and direction measuring component 620 is set as a wind speed and direction meter, the specific model can be selected from a gathering environment-friendly FB-10 model, and the wind speed and direction measuring component is used for acquiring wind speed and direction information of the surrounding environment in real time; the temperature and humidity measuring component 630 is set as a temperature and humidity sensor, and the specific model can be selected from STT-W series of Saiyi Ling for acquiring temperature and humidity information of the surrounding environment in real time.
Further, the device also comprises a control component 700 and an alarm component 800; the control assembly 700 and the alarm assembly 800 are both connected with the fixing assembly 100, the particulate matter detection assembly 400 and the alarm assembly 800 are both electrically connected with the control assembly 700, the particulate matter detection assembly 400 is used for transmitting the detected concentration information of the particulate pollutants to the control assembly 700, and the control assembly 700 is internally preset with a concentration threshold value of the particulate pollutants so as to correspondingly control the alarm assembly 800 to send alarm information.
Specifically, the control assembly 700 is set to be any one of a single chip microcomputer, a programmable logic controller or a logic circuit, the control assembly 700 is placed on the base 110, the particulate matter detection assembly 400 is connected with the control assembly 700 through a wire, the particulate matter detection assembly 400 can transmit concentration information of particulate pollutants, for example, numerical information of PM2.5, to the control assembly 700, the control assembly 700 is connected with the alarm assembly 800 through a wire, and when the PM2.5 numerical value exceeds a set range, the control assembly 700 controls the alarm assembly 800 to alarm so as to remind people to take necessary protective measures.
Further, the alarm assembly 800 includes an audible alarm unit 810 and an indicator light unit 820; the audible alarm unit 810 and the indicator light unit 820 are electrically connected to the control assembly 700.
Specifically, the sound alarm unit 810 and the indicator light unit 820 are both connected with the control assembly 700 through a wire, the sound alarm unit 810 is set as a loudspeaker or a buzzer, and when the concentration of the particulate pollutants exceeds a threshold value set in the control assembly 700, the sound alarm unit 810 gives out a sound to alarm; the indicator light unit 820 is provided as one or more indicator lights, and the indicator light unit 820 is illuminated when the concentration of particulate contaminants exceeds a threshold value set within the control assembly 700.
Further, the indicator lamp unit 820 includes a first indicator lamp 821, a second indicator lamp 822, and a third indicator lamp 823; the first indicator light 821, the second indicator light 822, and the third indicator light 823 are electrically connected to the control assembly 700.
Specifically, the first indicator 821 is set to be a green light, the second indicator 822 is set to be a yellow light, the third indicator 823 is set to be a red light, and the three indicator lights respectively correspond to different concentration states of the particulate pollutants, for example, the PM2.5 is in a range of 0-75 μ g/m3The time-green light is normally on, 75-150 mu g/m3Yellow light is normally on, 150 mu g/m3In the above, the red light is always on.
The air pollution detection device that this embodiment provided cooperatees through control assembly 700 and alarm assembly 800, can realize carrying out the early warning to particle pollutants's different concentration state for the air pollution detection device's that this embodiment provided use more intellectuality.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. An air pollution detection device, comprising: the device comprises a fixed assembly (100), a gas collecting part (200), a drying assembly (300) and a particulate matter detection assembly (400);
the gas collecting part (200) is connected with the fixed assembly (100), a gas collecting cavity (210) is arranged in the gas collecting part (200), and a gas inlet (220) and a gas outlet (230) which enable the gas collecting cavity (210) to be communicated with the outside are arranged on the gas collecting part (200);
the drying component (300) is connected with the gas collecting part (200) and used for drying the air in the gas collecting cavity (210), the particulate matter detecting component (400) is connected with the fixing component (100), and at least part of the particulate matter detecting component (400) extends into the gas collecting cavity (210) so as to detect particulate pollutants in the gas collecting cavity (210).
2. The air pollution detection device according to claim 1, wherein said drying assembly (300) comprises an electric heating sheet;
the electric heating sheet is arranged in the gas collection cavity (210), and the electric heating sheet is connected with the inner wall of the gas collection part (200).
3. The air pollution detection device according to claim 1, wherein said particulate matter detection assembly (400) comprises a particulate matter monitor;
the particle monitor is arranged on the fixed component (100), an opening is formed in one side of the gas collection part (200), and a detection probe of the particle monitor penetrates through the opening and extends into the gas collection cavity (210).
4. The air pollution detection device according to claim 1, further comprising a blower assembly (500);
the air blowing assembly (500) is arranged on the fixed assembly (100), and an air inlet of the air blowing assembly (500) is communicated with the air outlet (230) so that outside air enters the air collection cavity (210) through the air inlet (220) and is discharged from the air outlet (230).
5. The air pollution detection device according to claim 4, wherein a connecting pipe (510) is arranged between the blower assembly (500) and the air collecting part (200), the air outlet (230) is communicated with the air inlet through the connecting pipe (510), and a control valve (520) is arranged on the connecting pipe (510).
6. The air pollution detection device according to claim 4, wherein said fixing assembly (100) comprises a base (110) and a pillar (120);
the upright column (120) is connected with the base (110), a noise measuring component (600) is arranged at the top of the upright column (120), the gas collecting part (200) and the particulate matter detecting component (400) are both connected with the upright column (120), and the air blowing component (500) is arranged on the base (110).
7. The air pollution detection device according to claim 6, wherein said fixing assembly (100) further comprises a first cross arm (130), a second cross arm (140) and a third cross arm (150);
the first cross arm (130), the second cross arm (140) and the third cross arm (150) are connected with the upright post (120), an atmospheric pressure measuring component (610) is arranged on the first cross arm (130), a wind speed and direction measuring component (620) is arranged on the second cross arm (140), and a temperature and humidity measuring component (630) is arranged on the third cross arm (150).
8. The air pollution detection device according to claim 1, further comprising a control assembly (700) and an alarm assembly (800);
the control assembly (700) and the alarm assembly (800) are both connected with the fixing assembly (100), the particulate matter detection assembly (400) and the alarm assembly (800) are both electrically connected with the control assembly (700), the particulate matter detection assembly (400) is used for transmitting the detected concentration information of the particulate pollutants into the control assembly (700), and the control assembly (700) is internally preset with a concentration threshold of the particulate pollutants so as to correspondingly control the alarm assembly (800) to send alarm information.
9. The air pollution detection device according to claim 8, wherein said alarm assembly (800) comprises an audible alarm unit (810) and an indicator light unit (820);
the sound alarm unit (810) and the indicator light unit (820) are both electrically connected with the control assembly (700).
10. The air pollution detecting device according to claim 9, wherein said indicator light unit (820) includes a first indicator light (821), a second indicator light (822), and a third indicator light;
the first indicator light (821), the second indicator light (822) and the third indicator light are all electrically connected with the control assembly (700).
CN201921070855.6U 2019-07-10 2019-07-10 Air pollution detection device Active CN210166375U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921070855.6U CN210166375U (en) 2019-07-10 2019-07-10 Air pollution detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921070855.6U CN210166375U (en) 2019-07-10 2019-07-10 Air pollution detection device

Publications (1)

Publication Number Publication Date
CN210166375U true CN210166375U (en) 2020-03-20

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Application Number Title Priority Date Filing Date
CN201921070855.6U Active CN210166375U (en) 2019-07-10 2019-07-10 Air pollution detection device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112504586A (en) * 2020-11-26 2021-03-16 安徽盛世开元装备科技有限公司 Detection device and detection method for disturbance degree of steel structure net rack

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112504586A (en) * 2020-11-26 2021-03-16 安徽盛世开元装备科技有限公司 Detection device and detection method for disturbance degree of steel structure net rack
CN112504586B (en) * 2020-11-26 2022-11-22 安徽盛世开元装备科技有限公司 Detection device and detection method for disturbance degree of steel structure net rack

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