CN209784106U - Beta-ray radioactive source incision type particulate matter weighing system - Google Patents
Beta-ray radioactive source incision type particulate matter weighing system Download PDFInfo
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- CN209784106U CN209784106U CN201920287461.XU CN201920287461U CN209784106U CN 209784106 U CN209784106 U CN 209784106U CN 201920287461 U CN201920287461 U CN 201920287461U CN 209784106 U CN209784106 U CN 209784106U
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Abstract
the utility model discloses a beta-ray radioactive source incision type particulate matter weighing system, which comprises a guide block, wherein the guide block is horizontally arranged and provided with an airflow channel, the airflow channel is provided with an inlet and an outlet, and the inlet is positioned on the upper surface of the guide block; the filter paper is covered on the inlet to filter particles in the airflow introduced to the inlet by the sampling pipe positioned above the inlet; a detector disposed below the guide block opposite the entrance; a beta radiation source assembly movably disposed on an upper surface of the guide block and including a beta radiation source, the detector detecting a weight of the particulate matter when the beta radiation source assembly moves such that the beta radiation source is relatively overlapped with the inlet. Because the filter paper is fixed, the airflow directly enters the inlet through the filter paper, thereby reducing the loss of particles and improving the accuracy of measurement.
Description
Technical Field
The utility model relates to an ambient air monitoring technology field especially relates to a beta ray radiation source cut-in type particulate matter weighing system.
Background
The monitoring of air particulate matters is very important for the evaluation of environmental quality, and the common air particulate matter weighing system at present mainly uses methods such as light scattering, oscillating antenna and beta ray. The current beta ray monitoring method for measuring air particles can be based on two measurement structures, namely an in-situ measurement structure and an ex-situ measurement structure. In the in-situ measurement, the air flow needs to bypass a beta ray radioactive source or a detector before passing through the paper tape, and obvious particulate matter deposition can be generated due to curvilinear motion; in the ectopic measurement, the reciprocating motion process of the paper tape can cause the particles on the paper tape to fall off, and meanwhile, the positioning accuracy is also a technical difficulty. Both structures therefore inevitably lead to problems of loss of particulate matter prior to measurement, which in turn leads to lower measured values.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a beta ray radiation source cut-in type particulate matter weighing system can reduce the particulate matter loss, improves the measuring degree of accuracy.
According to the utility model discloses a beta ray radiation source cut-in type particulate matter weighing system, include:
The guide block is horizontally arranged and provided with an airflow channel, the airflow channel is provided with an inlet and an outlet, and the inlet is positioned on the upper surface of the guide block;
The filter paper is covered on the inlet to filter particles in the airflow introduced to the inlet by the sampling pipe positioned above the inlet;
A detector disposed below the guide block opposite the entrance;
a beta ray radiation source assembly movably disposed on an upper surface of the guide block, the beta ray radiation source assembly including a beta ray radiation source, the detector detecting a weight of the particulate matter on the filter paper when the beta ray radiation source assembly is moved to position the beta ray radiation source in relative overlapping relation with the inlet.
according to the utility model discloses beta ray radiation source cut-in type particulate matter weighing system, the during operation, at first, the air process that adopts in the sampling pipe follow after the filter paper filters the entry gets into airflow channel follows the export is discharged, and particulate matter in the air is stayed the entry top on the filter paper. Then, when the beta-ray radiation source assembly on the upper surface of the guide block moves to enable the beta-ray radiation source to be in a position of relative overlapping with the inlet, the detector detects the weight of the particles on the filter paper. Therefore, in the weighing process of the particulate matters, the filter paper is always fixed, and the airflow directly passes through the filter paper from the sampling pipe to enter the inlet, so that the loss of the particulate matters is reduced, and the measurement accuracy is improved.
According to the utility model discloses an embodiment, the upper surface of guide block is equipped with the constant head tank, the filter paper sets up in the constant head tank.
according to an embodiment of the present invention, the beta-ray radiation source assembly further comprises a source holder for holding the beta-ray radiation source.
according to a further embodiment of the present invention, the beta-ray radiation source assembly further comprises a traction rod and a driving machine, and the source holder is driven by the driving machine to perform horizontal linear motion.
In accordance with yet a further embodiment of the present invention, the guide block has a measuring position and a withdrawing position on an upper surface thereof, the beta-ray radiation source assembly is movable between the measuring position and the withdrawing position, the beta-ray radiation source assembly is in a position relatively overlapping the entrance when the beta-ray radiation source assembly is moved to the measuring position, and the beta-ray radiation source assembly is moved out of the entrance when the beta-ray radiation source assembly is moved to the withdrawing position.
According to a still further embodiment of the present invention, the measuring position is provided with two first positioning pins, and the two first positioning pins are oppositely arranged at intervals; correspondingly, two second positioning pins are arranged at the withdrawing position and are oppositely arranged at intervals; positioning bulges are respectively arranged on two opposite sides of the source support; when the beta-ray radiation source assembly moves to the measuring position, the positioning protrusion is matched with the first positioning pin for positioning; when the beta-ray radiation source assembly moves to the withdrawing position, the positioning protrusion is matched with the second positioning pin for positioning.
according to a still further embodiment of the present invention, two of the first positioning pins and two of the second positioning pins are distributed in a matrix to limit the linear movement of the beta-ray radiation source assembly between the first positioning pins and the second positioning pins.
According to an embodiment of the present invention, the tube end of the sampling tube faces downwards and corresponds to the inlet.
According to the utility model discloses further embodiment, still include hoisting device, hoisting device control the sampling pipe reciprocates.
According to the utility model discloses still further embodiment, hoisting device includes motor, cam, retaining ring, spring and support frame, wherein, the sampling pipe is vertical to be passed the support frame with be located in the support frame the retaining ring, the sampling pipe with the retaining ring is fixed, the sampling pipe for the support frame can reciprocate, spring coupling be in the retaining ring with between the support frame, the vertical setting of cam and with the lower surface contact of retaining ring, motor drive the cam rotates.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a schematic structural diagram of an incision-type particulate matter weighing system with a beta-ray radiation source according to an embodiment of the present invention.
Fig. 2 is a top view of a portion of a beta radiation source incising particulate matter weighing system according to an embodiment of the present invention.
Fig. 3 is a front view of fig. 2.
Fig. 4 is a schematic view of a beta radiation source assembly of a beta radiation source incisive particulate matter weighing system according to an embodiment of the present invention.
Fig. 5 is a process diagram of the sampling measurement according to the embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a lifting device of an incision type particulate matter weighing system with a beta-ray radiation source according to an embodiment of the present invention.
Reference numerals:
Beta-ray radioactive source incision type particulate matter weighing system 100
Guide block 1
Inlet 103 and outlet 104 of detent 101 detector 102 first detent pin 105 and second detent pin 106
Beta ray radiation source assembly 2
source holder 201 beta-ray radiation source 2011 positioning projection 2012 driving machine 202 traction bar 203
Filter paper 3
Sampling tube 4
lifting device 5
Motor 501 cam 502 retainer 503 spring 504 support bracket 505
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
A beta-ray source incision-type particulate matter weighing system 100 according to an embodiment of the present invention is described below with reference to fig. 1-6.
As shown in fig. 1 to 6, the beta-ray source incision type weighing system 100 according to the present invention comprises: the device comprises a guide block 1, filter paper 3, a detector 102 and a beta-ray radiation source assembly 2, wherein the guide block 1 is horizontally arranged, the guide block 1 is provided with an airflow channel, the airflow channel is provided with an inlet 103 and an outlet 104, and the inlet 103 is positioned on the upper surface of the guide block 1; the filter paper 3 is covered on the inlet 103 to filter particles in the airflow which is introduced to the inlet 103 from the sampling pipe 4 positioned above the inlet 103; the detector 102 is provided below the guide block 1 opposite to the entrance 103; the beta-ray radiation source assembly 2 is movably disposed on the upper surface of the guide block 1, and the beta-ray radiation source assembly 2 includes a beta-ray radiation source 2011, and when the beta-ray radiation source assembly 2 is moved to position the beta-ray radiation source 2011 to overlap the inlet 103, the detector 102 detects the weight of the particulate matter on the filter paper 3.
According to the utility model discloses beta ray radiation source cut-in type particulate matter weighing system 100, during operation, at first, the air that adopts in the sampling pipe 4 gets into airflow channel and discharges from export 104 from entry 103 after filtering through filter paper 3, and the particulate matter in the air is stayed on filter paper 3 above entry 103. Next, when the β -ray radiation source assembly 2 on the upper surface of the guide block 1 is moved so that the β -ray radiation source 2011 is positioned to overlap the inlet 103, the detector 102 detects the weight of the particulate matter on the filter paper 3. From this, the particulate matter is at the in-process of weighing, and filter paper 3 is fixed always, and the air current is directly through filter paper 3 inlet port 103 from sampling tube 4 to reduce the loss of particulate matter, improved the measuring accuracy.
According to the utility model discloses an embodiment, the upper surface of guide block 1 is equipped with constant head tank 101, and filter paper 3 sets up in constant head tank 101, can prevent that filter paper 3 from taking place to shift, and through filter paper 3 when guaranteeing air current flow to enter the mouth 103, be favorable to the particulate matter to stay on filter paper 3, avoid the particulate matter loss.
According to an embodiment of the present invention, the beta-ray radiation source assembly 2 further includes a source holder 201, and the source holder 201 is used for holding a beta-ray radiation source 2011. Therefore, the beta-ray radioactive source 2011 can be placed at a fixed place, so that the measurement accuracy is improved, and the operation is convenient.
According to an embodiment of the present invention, the β -ray radiation source assembly 2 further includes a traction rod 203 and a driving machine 202, the traction rod 203 is connected between the source support 201 and the driving machine 202, and the source support 201 is driven by the traction rod 203 and the driving machine 202 to make a horizontal linear motion. Therefore, the drive source bracket 201 is driven to horizontally and linearly move on the upper surface of the guide block 1 by the driver 202 and the traction rod 203, and the driver 202 and the drive source bracket 201 are connected by the traction rod 203, so that the installation is convenient. Here, the driving machine 202 may be a linear motor or a return spring electromagnet.
According to a further embodiment of the present invention, a measuring position and a withdrawing position are provided on the upper surface of the guide block 1, and the beta-ray radiation source assembly 2 can move between the measuring position and the withdrawing position; when the β -ray radiation source assembly 2 is moved to the measurement position, the β -ray radiation source 2011 is in a position of opposing overlap with the entrance 103; when beta radiation source assembly 2 is moved to the withdrawn position, beta radiation source 2011 is moved out of portal 103. Thus, when the β -ray radiation source unit 2 is moved to the measurement position, the detector 102 starts the measurement, and when the β -ray radiation source unit 2 is moved from the measurement position to the retreat position, the detector 102 stops the detection, and the next measurement is facilitated.
According to a still further embodiment of the present invention, the measuring position is provided with two first positioning pins 105, the two first positioning pins 105 are arranged opposite to each other at intervals; correspondingly, two second positioning pins 106 are arranged at the withdrawing position, and the two second positioning pins 106 are oppositely arranged at intervals; the opposite two sides of the source holder 201 are respectively provided with a positioning projection 2012; when the beta-ray radiation source assembly 2 moves to the measuring position, the positioning projection 2012 is matched with the first positioning pin 105 for positioning; when the beta-ray radiation source assembly 2 moves to the withdrawing position, the positioning projection 2012 is matched with the second positioning pin 106 for positioning. When the source holder 201 moves to the measurement position, the positioning protrusion 2012 and the first positioning pin 105 are cooperatively positioned to enable the beta-ray source 2011 to move right to the entrance 103 and overlap with the entrance 103, so that the measurement is convenient; when the source holder 201 moves to the exit position, the positioning protrusion 2012 is matched with the second positioning pin 106 for positioning, so that the source holder 201 can be prevented from sliding out of the upper surface of the guide block 1, and the operation is convenient.
According to a still further embodiment of the present invention, two first positioning pins 105 and two second positioning pins 106 are arranged in a matrix to limit the beta-ray radiation source assembly 2 to move linearly. The two first positioning pins 105 and the two second positioning pins 106 are distributed in a matrix, and the beta-ray radiation source assembly 2 moves in the matrix formed by the first positioning pins 105 and the second positioning pins 106 to ensure that the beta-ray radiation source assembly 2 can do linear motion when approaching a measuring position or a withdrawing position, so that the beta-ray radiation source 2011 can be completely and relatively overlapped with the inlet 103 at the measuring position, and the problem that partial particles cannot be detected due to the fact that the beta-ray radiation source 2011 and the inlet 103 are not overlapped is avoided. Therefore, the accuracy of measurement is improved. For example, fig. 5 is a schematic diagram of a sampling and weighing process, first, when the sampling tube 4 is not vented, the source holder 201 is moved to a measurement position (a matching position of the positioning protrusion 2012 and the first positioning pin 105), at this time, the β -ray radiation source 2011 is just moved to the entrance 103 and is overlapped with the entrance 103, the detector 102 detects an empty sample, and after the detection is finished, the source holder 201 is moved to a withdrawal measurement position (a matching position of the positioning protrusion 2012 and the second positioning pin 106); at this time, the sampling tube 4 is filled with an air flow (a sample air flow containing particulate matter), then the air flow is transmitted to the inlet 103, then the source holder 201 is moved to the measurement position (the matching position of the positioning protrusion 2012 and the first positioning pin 105), at this time, the beta-ray radiation source 2011 just moves to the inlet 103 and is overlapped with the inlet 103, the particulate matter in the sample is left on the filter paper 3, and the detector 102 detects the particulate matter; the detector 102 detects the empty sample and the sample containing the particulate matters twice, and then moves the source holder 201 to the withdrawing measurement position (the positioning protrusion 2012 is matched with the second positioning pin 106 for positioning). The weight of particulate matter in the sample can be determined by the ratio of the two results of the detection by detector 102 of the empty sample and the sample containing particulate matter.
As shown in fig. 1 and 5, according to an embodiment of the present invention, the tube end of the sampling tube 4 faces downwards and corresponds to the inlet 103. Thereby, the sampling tube 4 is facilitated to transport the sampling air flow to the inlet 103.
As shown in fig. 6, according to an embodiment of the present invention, the sampling device further comprises a lifting device 5, wherein the lifting device controls the sampling tube to move up and down to adjust the height distance between the tail opening of the sampling tube 4 and the inlet 103. Therefore, when a sample is measured each time, the lifting device 5 is controlled to enable the sampling pipe 4 to move downwards to be close to the inlet 103, so that air flow in the sampling pipe 4 can completely flow into the inlet 103, the condition of overflow of the air flow is avoided, the loss of particles is reduced, and the accuracy of measurement is improved; after the sample measurement is finished, the lifting device 5 is controlled to ascend, so that the sampling pipe 4 moves upwards, and the filter paper 3 is convenient to replace.
Specifically, as shown in fig. 6, the lifting device 5 includes a motor 501, a cam 502, a retainer 503, a spring 504, and a support bracket 505. The sampling tube 4 vertically penetrates through a supporting frame 505 and a retainer ring 503 positioned in the supporting frame 505, the sampling tube 4 is fixed with the retainer ring 503, the sampling tube 4 can move up and down relative to the supporting frame 505, a spring 504 is positioned above the retainer ring 503, the spring 504 is connected between the retainer ring 503 and the supporting frame 505, a cam 502 is vertically arranged and is in contact with the lower surface of the retainer ring 503, and a motor 501 drives the cam 502 to rotate. When the motor 501 drives the cam 502 to rotate, the cam 502 drives the retainer ring 503 and the sampling pipe 4 to synchronously move upwards in the lifting process, and meanwhile, the spring 504 is compressed due to the upward movement of the retainer ring 503; during the downward stroke of the cam 502, the compressed spring 504 may provide enough pressure to force the stop ring 503 to move downward smoothly, thereby moving the sampling tube 4 downward smoothly.
according to an embodiment of the invention, the outlet 104 is located on the side surface of the guide block 1 (as shown in fig. 1). Thereby facilitating the discharge of the particulate filtered gas from the outlet 104. Of course, in other embodiments, the outlet 104 may be provided on the lower surface or the upper surface of the guide block 1.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a beta ray radiation source incised particulate matter weighing system which characterized in that includes:
The guide block is horizontally arranged and provided with an airflow channel, the airflow channel is provided with an inlet and an outlet, and the inlet is positioned on the upper surface of the guide block;
The filter paper is covered on the inlet to filter particles in the airflow introduced to the inlet by the sampling pipe positioned above the inlet;
A detector disposed below the guide block opposite the entrance;
A beta ray radiation source assembly movably disposed on an upper surface of the guide block, the beta ray radiation source assembly including a beta ray radiation source, the detector detecting a weight of the particulate matter on the filter paper when the beta ray radiation source assembly is moved to position the beta ray radiation source in relative overlapping relation with the inlet.
2. The beta radiation source incision type particle weighing system of claim 1, wherein the guide block has a positioning groove on its upper surface, and the filter paper is disposed in the positioning groove.
3. The beta radiation source incisive particulate matter weighing system of claim 1 wherein the beta radiation source assembly further comprises a receptacle for holding the beta radiation source.
4. The beta radiation source incisive particulate matter weighing system of claim 3 wherein the beta radiation source assembly further comprises a traction bar and a driver, the receptacle being driven by the driver to move horizontally in a straight line.
5. The beta radiation source incisive particulate matter weighing system of claim 4 wherein the guide block has a measurement position and an exit position on an upper surface thereof, the beta radiation source assembly being movable between the measurement position and the exit position, the beta radiation source being in an overlapping position relative to the inlet when the beta radiation source assembly is moved to the measurement position, the beta radiation source being moved out of the inlet when the beta radiation source assembly is moved to the exit position.
6. The beta ray source incision type particle weighing system of claim 5, wherein the measuring position is provided with two first locating pins, and the two first locating pins are arranged oppositely at intervals; correspondingly, two second positioning pins are arranged at the withdrawing position and are oppositely arranged at intervals; positioning bulges are respectively arranged on two opposite sides of the source support; when the beta-ray radiation source assembly moves to the measuring position, the positioning protrusion is matched with the first positioning pin for positioning; when the beta-ray radiation source assembly moves to the withdrawing position, the positioning protrusion is matched with the second positioning pin for positioning.
7. The beta radiation source incision type particle weighing system of claim 6, wherein two first alignment pins and two second alignment pins are arranged in a matrix to limit linear movement of the beta radiation source assembly between the first alignment pins and the second alignment pins.
8. The beta radiation source incision type particle weighing system of claim 1 wherein the tube end of the sampling tube faces downward and corresponds to the inlet.
9. The beta radiation source incision type particle weighing system of claim 8, further comprising a lifting device, wherein the lifting device controls the up and down movement of the sampling tube.
10. The beta ray radiation source incision type particle weighing system of claim 9, wherein the lifting device comprises a motor, a cam, a retainer ring, a spring and a support frame, wherein the sampling tube vertically penetrates through the support frame and the retainer ring positioned in the support frame, the sampling tube is fixed with the retainer ring, the sampling tube can move up and down relative to the support frame, the spring is connected between the retainer ring and the support frame, the cam is vertically arranged and is in contact with the lower surface of the retainer ring, and the motor drives the cam to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920287461.XU CN209784106U (en) | 2019-03-06 | 2019-03-06 | Beta-ray radioactive source incision type particulate matter weighing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920287461.XU CN209784106U (en) | 2019-03-06 | 2019-03-06 | Beta-ray radioactive source incision type particulate matter weighing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209784106U true CN209784106U (en) | 2019-12-13 |
Family
ID=68796745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920287461.XU Active CN209784106U (en) | 2019-03-06 | 2019-03-06 | Beta-ray radioactive source incision type particulate matter weighing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209784106U (en) |
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2019
- 2019-03-06 CN CN201920287461.XU patent/CN209784106U/en active Active
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