CN114965193A - Atmospheric particulate on-line monitoring device based on beta-ray method - Google Patents

Abstract

The invention relates to an on-line monitoring device for atmospheric particulate matter based on a beta ray method. The on-line monitoring device for atmospheric particulate matter based on the β-ray method according to the present invention comprises: a casing, a filter paper belt conveying unit, an air intake unit, a β-ray detection unit, an upper guide rail, a lower guide rail and a drive unit. The upper guide rail and the lower guide rail are arranged in parallel in the casing, the filter paper belt conveying unit is arranged between the upper guide rail and the lower guide rail, and the air intake unit is arranged above the upper guide rail; the top of the casing is provided with a first air inlet hole, and the upper guide rail is arranged through the second air intake hole; the air intake unit includes a lift assembly, an air intake duct and a nozzle, and the upper end of the air intake duct passes through the corresponding first air intake hole and is connected to an external air source; The upper β-ray source and the β-ray detector arranged on the lower guide rail. The on-line monitoring device for atmospheric particulate matter based on the beta ray method provided by the present invention has the advantages of high on-line real-time detection and measurement accuracy.

Description

An online monitoring device for atmospheric particulate matter based on β-ray method

technical field

The invention relates to the field of environmental monitoring, in particular to an online monitoring device for atmospheric particulate matter based on a beta ray method.

Background technique

The atmospheric environment has a crucial impact on people's lives and health, so it is particularly important to monitor the particulate matter in the atmospheric environment. Atmospheric particulate matter is a general term for solid or liquid particulate matter dispersed in the atmosphere. Atmospheric particulate matter with a particle size of 0.01um to 100um is collectively referred to as total suspended particulate matter (TSP). And PM10 and PM2.5 refer to atmospheric particles with aerodynamic diameters less than or equal to 10um and 2.5um, respectively. PM10 is also known as inhalable particulate matter, and the World Health Organization (WHO) calls it particulate matter that can enter the chest; PM2.5 can enter the human alveoli and is called lung-enterable particulate matter.

As a relatively common method for measuring the mass concentration of atmospheric particulate matter, β-ray absorption method plays an important role in the monitoring of particulate matter in the atmospheric environment.

The basic principle of the β-ray absorption method is as follows: with the increase of the deposition amount of atmospheric particles on the filter membrane, the intensity of the β-ray penetrating the filter membrane decays exponentially. The mass of atmospheric particulate matter.

However, the existing atmospheric particulate matter detection devices based on the β-ray absorption method still have the following problems:

1) The detection process is divided into two steps: sampling and measurement. Sampling and measurement are separated, and there is a certain time difference, which cannot be applied to work scenarios that require online real-time detection of atmospheric particles;

2) During the transmission process of the sampling filter membrane, it is inevitable that the filter membrane will shake, which will affect the uniformity of the distribution of collected particles in the filter membrane, thus bringing inaccuracy to the final measurement result.

SUMMARY OF THE INVENTION

Based on this, the purpose of the present invention is to provide an online monitoring device for atmospheric particulate matter based on the β-ray method, which has the advantages of real-time monitoring and high measurement accuracy.

The invention provides an on-line detection device for atmospheric particulate matter based on a beta-ray method, comprising a casing and a filter paper belt conveying unit, an air intake unit, a beta-ray detection unit, an upper guide rail, a lower guide rail and a drive unit arranged in the casing;

The upper guide rail and the lower guide rail are arranged in parallel in the casing, the filter paper belt conveying unit is arranged between the upper guide rail and the lower guide rail, and the air intake unit is arranged above the upper guide rail;

A first air inlet hole is formed through the top of the casing, and a second air inlet hole corresponding to the first air inlet hole is formed through the upper guide rail;

The air intake unit includes a lift assembly, an air intake duct and a nozzle arranged at the lower end of the air intake duct, the upper end of the air intake duct is connected to an external air source through the first air intake hole, and the The lifting assembly is used to make the lower end of the air intake duct be located above the upper guide rail or pass through the second air intake hole and drive the nozzle to press the measurement area of the filter paper tape;

The β-ray detection unit includes a β-ray source relatively arranged on the upper guide rail and a β-ray detector arranged on the lower guide rail;

The driving unit is used for driving the beta-ray source and the beta-ray detector to move to the upper and lower ends of the measurement area on the filter paper belt.

The on-line monitoring device for atmospheric particulate matter based on the β-ray method described in the present invention can be directly placed in the atmospheric environment to be detected, avoiding the sampling and transportation process of the gas to be detected, and avoiding the vibration of the filter membrane during the transmission process. To solve the problem of inaccurate measurement results, the online real-time detection function is realized.

Further, the lifting assembly includes a positioning plate and a hydraulic rod, the upper end of the hydraulic rod is fixed on the top of the casing, the lower end of the hydraulic rod is fixedly connected with the positioning plate, and the intake pipe passes through The positioning plate is fixedly connected with the positioning plate.

The lifting assembly enables the air intake mechanism to rise above the β-ray source without blocking the moving path of the β-ray source, ensuring that the β-ray source can move above the measurement area and detect atmospheric particles in the measurement area. .

Further, the driving unit includes a first driving unit and a second driving unit, the first driving unit is used for driving the β-ray source to move to the upper end of the measurement area on the filter paper belt, the first driving unit is Two driving units are used to drive the beta-ray detector to move to the lower end of the measurement area on the filter paper belt.

Further, the first driving unit includes a first motor and a first screw rod, the first motor is connected to the β-ray source through the first screw rod, and when the first motor drives the first screw When the screw rod rotates, the first screw rod drives the beta-ray source to move back and forth along the upper guide rail, so as to drive the beta-ray source to reciprocate in the horizontal direction.

Further, the second driving unit includes a second motor and a second screw rod, the second motor is connected to the β-ray detector through the second screw rod, and when the second motor drives the first screw rod. When the second screw rod rotates, the second screw rod drives the beta-ray detector to move back and forth along the upper guide rail, so as to drive the beta-ray detector to reciprocate in the horizontal direction.

Further, a monitoring unit is also included, the monitoring unit is configured to obtain the measurement result of the beta-ray detector in the measurement area, and display the detection result of atmospheric particulate matter after calculation according to a preset algorithm.

The monitoring unit can display the particulate matter content in the monitored ambient atmosphere in real time, which is convenient for monitoring staff to monitor in real time, and make relevant work arrangements and adjustments according to the particulate matter content in the gas.

Further, the monitoring unit further includes a reminder device, and when the atmospheric particle detection result is higher than a set value, the reminder device sends out a reminder.

When the atmospheric particulate matter content of the monitored environment is too high, the reminder device is activated, so that the monitoring staff can find the problem in time and make rectification according to the on-site environment.

Further, the reminding device is a buzzer or an indicator light.

The reminder device can issue obvious reminders to remind the monitoring staff to notice the abnormal situation.

For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings.

Description of drawings

1 is a schematic diagram of the relative positions of each component in a sampling mode of an on-line monitoring device for atmospheric particulate matter based on a beta ray method according to an embodiment of the present invention;

2 is a schematic diagram of the relative positions of each component in a detection mode of an on-line monitoring device for atmospheric particulate matter based on a beta ray method according to an embodiment of the present invention;

FIG. 3 is a top view of a casing of an on-line monitoring device for atmospheric particulate matter based on a beta ray method according to an embodiment of the present invention;

4 is a top view of an upper guide rail of an on-line monitoring device for atmospheric particulate matter based on a beta ray method according to an embodiment of the present invention.

In the picture: 1- shell, 11- first air inlet, 2- filter paper belt, 3- air intake unit, 31- air intake pipe, 32- nozzle, 33- positioning plate, 34- hydraulic rod, 4-β Radiation detection unit, 41-β-ray source, 42-β-ray detector, 51-upper rail, 52-lower rail, 511-second air inlet.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all of the contents related to the present invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations of the invention.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Several specific embodiments are given below to introduce the technical solutions of the present application in detail. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

In view of the technical problems in the background technology, as shown in Figures 1-4, Figure 1 is a schematic diagram of the relative positions of each component in the sampling mode of an online monitoring device for atmospheric particulate matter based on the β-ray method according to an embodiment of the present invention. 2 is a schematic diagram of the relative position of each component in the detection mode of an online monitoring device for atmospheric particulate matter based on β-ray method according to an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. A plan view of the casing of the online particulate matter monitoring device, FIG. 4 is a plan view of the upper guide rail of an online monitoring device for atmospheric particulate matter based on the beta ray method according to an embodiment of the present invention, and the present invention provides an atmospheric particulate matter based on the beta ray method. The online monitoring device includes a housing 1 and a filter paper belt conveying unit 2, an air intake unit 3, a beta-ray detection unit 4, an upper guide rail 51, a lower guide rail 52 and a drive unit arranged in the housing 1.

The upper guide rail 51 and the lower guide rail 52 are arranged in parallel in the casing 1 , the filter paper belt conveying unit 2 is arranged between the upper guide rail 51 and the lower guide rail 52 , and the air intake unit is arranged above the upper guide rail 51 .

A first air intake hole 11 is formed through the top of the casing 1 , and a second air intake hole 511 corresponding to the first air inlet hole 11 is formed through the upper guide rail 51 .

The intake unit 3 includes a lift assembly, an intake pipe 31 and a nozzle 32 arranged at the lower end of the intake pipe. The upper end of the intake pipe 31 is connected to an external air source through the first intake hole 11. The lower end of the air inlet duct 31 is located above the upper guide rail 51 or passes through the second air inlet hole 511 and drives the nozzle 32 to press the measurement area of the filter paper tape 2 .

The beta-ray detection unit 4 includes a beta-ray source 41 disposed opposite to the upper guide rail 51 and a beta-ray detector 42 disposed on the lower guide rail 52 .

The driving unit (not shown in the figure) is used to drive the beta-ray source 41 and the beta-ray detector 42 to move to the upper and lower ends of the measurement area on the filter paper belt 2 .

In a preferred embodiment, the lifting assembly includes a positioning plate 33 and a hydraulic rod 34. The upper end of the hydraulic rod 34 is fixed on the top of the housing 1, the lower end of the hydraulic rod 34 is fixedly connected with the positioning plate 33, and the intake pipe 31 passes through The positioning plate 33 is fixedly connected with the positioning plate 33 .

In another preferred embodiment, the driving unit includes a first driving unit and a second driving unit, the first driving unit is used to drive the beta-ray source 41 to move to the upper end of the measurement area on the filter paper belt 2, and the second driving unit is used for After the beta-ray detector 42 moves to the lower end of the measurement area on the filter paper belt 2 .

The first drive unit may specifically include a first motor and a first screw rod. The first motor is connected to the beta ray source 41 through the first screw rod. When the first motor drives the first screw rod to rotate, the first screw rod drives the beta rays. The source 41 moves back and forth along the upper guide rail 51 to drive the beta-ray source 41 to reciprocate in the horizontal direction.

Specifically, the second driving unit may include a second motor and a second screw rod. The second motor is connected to the β-ray detector 42 through the second screw rod. When the second motor drives the second screw rod to rotate, the second screw rod drives the β-ray detector 42. The ray detector 42 moves back and forth along the lower guide rail 52 to drive the beta ray detector 42 to reciprocate in the horizontal direction.

In a specific embodiment, an on-line monitoring device for atmospheric particulate matter based on the beta ray method provided by the present invention can be divided into a sampling mode and a detection mode, and the detection process is as follows:

1) Sampling mode:

The first motor drives the first screw rod to rotate, and then drives the beta-ray source 41 to move horizontally along the upper guide rail 51 to the end away from the measurement area; the second motor drives the second screw rod to rotate, and then drives the beta-ray detector 42 to move along the lower guide rail 52 Move horizontally to the end away from the measurement area;

The hydraulic rod 34 controls the positioning plate 33 to descend, and drives the intake pipe 31 to descend to a certain position through the upper guide rail 51 .

2) Detection mode: the hydraulic rod 34 controls the positioning plate 33 to rise, and drives the intake pipe 31 to rise above the upper guide rail 51;

The first motor drives the first screw rod to rotate, and then drives the beta ray source 41 to move horizontally along the upper guide rail 51 to just above the measurement area; the second motor drives the second screw rod to rotate, and then drives the beta ray detector 42 to move horizontally along the lower guide rail 52 Move to just below the measurement area;

The β-ray source 41 sufficiently irradiates the above-mentioned measurement region, and the β-ray detector 42 detects the β-ray transmitted through the measurement region.

In order to facilitate the monitoring staff to view the particulate matter content of the monitored ambient atmosphere in real time, in a preferred embodiment, an online monitoring device for atmospheric particulate matter based on the β-ray method provided by the present invention further includes a monitoring unit, which is used to obtain the β-ray method. The ray detector 42 displays the measurement result of the atmospheric particulate matter after the measurement result in the measurement area is calculated according to the preset algorithm. In a specific embodiment, the monitoring unit is a computer equipped with a calculation program and a display screen.

In practical applications, if the atmospheric particulate matter content of the monitored environment is higher than a certain value, it is generally necessary to immediately alert the monitoring staff, so that the staff can find the abnormality as soon as possible, and then make adjustments to the on-site situation according to the atmospheric particulate matter content. In view of the above technical problems, in another embodiment, the monitoring unit further includes a reminder device. When the detection result of atmospheric particulate matter in the detected environment is higher than the set value, the reminder device sends out a reminder. In a preferred embodiment, the reminder device is a buzzer or an indicator light. By setting obvious sound prompts or flashing prompts, it is ensured that the monitoring staff can detect abnormal situations in time even when they are not next to the monitoring unit.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are more specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention.

Claims (8)

1. The utility model provides an atmospheric particulates on-line monitoring device based on beta ray method which characterized in that:

the device comprises a shell, and a filter paper belt conveying unit, an air inlet unit, a beta-ray detection unit, an upper guide rail, a lower guide rail and a driving unit which are arranged in the shell;

the upper guide rail and the lower guide rail are arranged in the shell in parallel, the filter paper tape conveying unit is arranged between the upper guide rail and the lower guide rail, and the air inlet unit is arranged above the upper guide rail;

a first air inlet hole is arranged at the top of the shell in a penetrating manner, and a second air inlet hole corresponding to the first air inlet hole is arranged in the upper guide rail in a penetrating manner;

the air inlet unit comprises a lifting assembly, an air inlet pipeline and a nozzle arranged at the lower end of the air inlet pipeline, the upper end of the air inlet pipeline penetrates through the first air inlet hole to be connected with an external air source, and the lifting assembly is used for enabling the lower end of the air inlet pipeline to be located above the upper guide rail or penetrate through the second air inlet hole and drive the nozzle to press a measuring area of the filter paper tape;

the beta ray detection unit comprises a beta ray source and a beta ray detector, wherein the beta ray source is oppositely arranged on the upper guide rail, and the beta ray detector is arranged on the lower guide rail;

the driving unit is used for driving the beta ray source and the beta ray detector to move to the upper end and the lower end of the measuring area on the filter paper belt.

2. The atmospheric particulate on-line monitoring device based on the beta-ray method according to claim 1, characterized in that:

the lifting assembly comprises a positioning plate and a hydraulic rod, the upper end of the hydraulic rod is fixed at the top of the shell, the lower end of the hydraulic rod is fixedly connected with the positioning plate, and the air inlet pipeline penetrates through the positioning plate and is fixedly connected with the positioning plate.

3. The atmospheric particulate on-line monitoring device based on the beta-ray method according to claim 1, characterized in that:

the driving unit comprises a first driving unit and a second driving unit, the first driving unit is used for driving the beta-ray source to move to the upper end of the measuring area on the filter paper belt, and the second driving unit is used for driving the beta-ray detector to move to the lower end of the measuring area on the filter paper belt.

4. The atmospheric particulate detection device based on beta ray method of claim 3, characterized in that:

the first driving unit comprises a first motor and a first screw rod, the first motor is connected with the beta ray source through the first screw rod, and when the first motor drives the first screw rod to rotate, the first screw rod drives the beta ray source to move back and forth along the upper guide rail so as to drive the beta ray source to reciprocate in the horizontal direction.

5. The atmospheric particulate detection device based on the beta-ray method according to claim 3, characterized in that:

the second driving unit comprises a second motor and a second screw rod, the second motor is connected with the beta-ray detector through the second screw rod, and when the second motor drives the second screw rod to rotate, the second screw rod drives the beta-ray detector to move back and forth along the upper guide rail so as to drive the beta-ray detector to reciprocate in the horizontal direction.

6. The atmospheric particulate detection device based on the beta-ray method according to claim 1, characterized in that:

the device further comprises a monitoring unit, wherein the monitoring unit is used for acquiring the measurement result of the beta-ray detector in the measurement area and displaying the detection result of the atmospheric particulates.

7. The atmospheric particulate on-line monitoring device based on the beta-ray method according to claim 6, characterized in that:

the monitoring unit further comprises a reminding device, and when the atmospheric particulate matter detection result is higher than a set value, the reminding device sends out a reminder.

8. The atmospheric particulate on-line monitoring device based on the beta-ray method according to claim 7, characterized in that:

the reminding device is a buzzer or an indicator light.

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