CN210720077U - Dust concentration detection device of nearly forward light scattering - Google Patents
Dust concentration detection device of nearly forward light scattering Download PDFInfo
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- CN210720077U CN210720077U CN201921213012.7U CN201921213012U CN210720077U CN 210720077 U CN210720077 U CN 210720077U CN 201921213012 U CN201921213012 U CN 201921213012U CN 210720077 U CN210720077 U CN 210720077U
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Abstract
The utility model belongs to dust concentration detection area specifically discloses a dust concentration detection device of nearly forward light scattering, including shell, protecgulum and hou gai, pass the protecgulum rather than the five-core spring shielded wire of inside intercommunication, be provided with nearly forward light detection structure in the shell, nearly forward light detection mechanism includes, laser pipe, sampling head, narrowband optical filter, lens hood, optical lens, signal reception processing circuit board. The beneficial effects of the utility model are that, through setting up near to the light detection mechanism, utilize the difference of laser scattering degree in different concentration dusts, then detect scattered light's intensity to convert light intensity signal into voltage strength, thereby the accurate dust concentration who learns the environment that the sampling head is located.
Description
Technical Field
The utility model relates to a dust concentration detection field, especially a dust concentration detection device of nearly forward light scattering.
Background
Portable suspended particles concentration on-line monitoring and early warning device mainly used carries out on-line monitoring and early warning to the suspended particles concentration of dust workplaces such as mine, cement plant, flour factory to satisfy the high accuracy measurement of suspended particles concentration under current each different dust environment. The device can be under the natural wind current state real-time monitoring current environment's suspended particles concentration to through the air quality of the form real-time supervision current environment of local data and data upload, and play emergent early warning function to the condition that suspended particles concentration exceeds standard.
The existing various suspended particulate concentration measurement principles at the present stage mainly include an optical type, a ray type, a weighing type and a charge type, wherein the optical type is most widely used, but the optical type generally adopts a light dialysis principle, the structure needs a relatively closed darkroom to prevent the influence of peripheral light on a detection sensor, meanwhile, a guiding fan is needed inside to suck the gas of the surrounding environment, and the data acquisition can be carried out only by sampling a filter membrane, so that the structure is relatively complex for a manufacturer, the installation is not easy, and the production cost is increased; meanwhile, the operation of a user unit is complex, the operation is not easy to replace the filter membrane in a dust environment, and the filter membrane is easy to contaminate dust to cause large measurement error and even inaccurate measurement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem, a dust concentration detection device of nearly forward light scattering has been designed.
The technical proposal of the utility model is that the dust concentration detection device with near forward light scattering comprises a shell, a front cover and a back cover which are arranged at the two ends of the shell, and a five-core spring shielding wire which passes through the front cover and is communicated with the interior of the front cover, be provided with nearly preceding light detection structure in the shell, nearly preceding light detection mechanism includes, set up in the shell is inside and by the power supply of five core spring shielded wires is used for transmitting laser's laser pipe, set up in laser pipe laser emission end one side and pass the external sampling head of shell intercommunication, set up in the narrow band filter that is used for filtering light in sampling head one side, set up in the lens hood that the narrow band filter rear end is used for shielding portion light, set up and be used for carrying out optical processing's optical lens to light, set up in the signal reception processing circuit board that the optical lens rear end is used for turning into the signal of telecommunication with the light intensity signal.
As the implementation structure that can supply to choose for use of sampling head, the sampling head is the hollow structure, in the shell and with the position that the sampling head corresponds is provided with the detection section, the detection section is used for clamping the fixing the sampling head, there is the cavity in detection section middle part, its cavity position with the hollow position intercommunication of sampling head, dust particle in the external environment can get into detection section middle part cavity through this passageway.
As an alternative embodiment, a transition section is arranged between the laser tube and the detection section, and the transition section is hollow and is used for the laser of the laser tube to pass through.
As a possible implementation way of processing the laser beam by the optical lens, the laser beam is scattered by the split light at the rear part of the detection section, and the scattered light is emitted to the optical lens and is optically processed; the number of the optical lenses is two, the optical lenses are hemispheric, the hemispheric surfaces of the two optical lenses are oppositely arranged, the scattering light passes through the first lens, the scattering light is in a divergent state and is changed into a parallel state, and after the light reaches the second lens, the light is changed into a light-gathering state from the parallel state and is focused on the signal receiving and processing circuit board.
As an alternative embodiment of the arrangement mode of the laser tube, the laser tube is arranged inside the shell and close to the position of the five-core spring shielding line, and the laser beam emitted by the laser tube is preferably 650 nm.
As an optional implementation of the arrangement of the light shield, a light shield seat is arranged between the light shield and the optical lens, the light shield is fixed on the light shield seat through glue, and a light absorption cloth is attached to the surface of an inner space formed by the light shield and the light shield seat to perform light absorption treatment, so that a light source is prevented from generating secondary scattering.
The light shield and the light shield seat are used for shielding the residual parallel light of the laser beam after air dust scattering, and the part of the parallel light can be absorbed by the light shield and can not be scattered.
As a limitation of the filtering performance of the narrow-band filter, the narrow-band filter only allows 650nm laser beams to pass through, and peripheral natural light is filtered out to enter the optical filter at the rear end of the narrow-band filter.
As an embodiment of an optional structure manner of the signal receiving processing circuit board, the signal receiving processing circuit board includes a photoelectric conversion device and a collecting and converting circuit, the photoelectric conversion device converts a received light signal into a current signal, and converts the current signal into a standard voltage signal (0-5V) through the collecting and converting circuit, and the standard voltage signal is output through the five-core spring shielding line.
The dust concentration acquisition device has the beneficial effects that through the arrangement of the near-forward light detection mechanism, the scattering degree of laser in dust with different concentrations is different, then the intensity of scattered light is detected, and a light intensity signal is converted into voltage intensity, so that the dust concentration of the environment where the sampling head is located is accurately known. The power is supplied to the laser tube by the five-core spring shielding wire, then the laser tube emits laser, the laser reaches the detection section through the transition section, the position of the detection section is provided with the sampling head, dust particles in the external environment enter the central position of the detection section through the hollow channel of the sampling head, then the laser passes through the position, partial laser is scattered under the action of the dust, the continuous straight going direction without scattering is absorbed by the light shield, the scattered light enters the optical lens from the outer side of the light shield and is converged on the photoelectric conversion device after being refracted, and then the light intensity signal is converted into an electric signal, through the process, the device can be seen, in the working process, the device does not need to use components related to the filter membrane, can directly detect any occasions needing to be detected, does not need to replace corresponding components, thereby expanding the use occasion of the utility model, and simplifies the operation steps in the use process.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the operation of the present invention;
FIG. 3 is a flow chart of the present invention;
in the figure, 1, a five-core spring shielding wire; 2. a rubber sleeve; 3. a five-core aviation plug; 4. a first screw; 5. a five-core aviation socket; 6. a second screw; 7. a front cover; 8. a housing; 9. a left sampling head; 10. a right sampling head; 11. a rear cover; 12. m8 thin nuts; 13. arranging wires with five cores; 14. a long screw I; 15. an insulating pad post; 16. an inner cover; 17. a first insulating pad column; 18. a long screw II; 19. an insulating pad post; 20. a power supply circuit board; 21. a second insulating pad column; 22. laser casing; 23. a laser tube; 24. a transition section; 25. a detection section; 26. a narrow band filter; 27. a nylon gasket; 28. a via hole; 29. a light shield; 30. a light shielding seat; 31. a front optical lens; 32. a lens housing; 33. a rear optical lens; 34. a circuit board base; 35. a signal receiving and processing circuit board; 36. a circuit board cover; 37. ethylene propylene diene monomer rubber cushion; 38. a right long screw; 39. left long screw.
Detailed Description
Firstly, the working principle of the present invention is explained as follows by combining with the attached drawings 1-3, the five-core spring shielding line 1 is used for supplying power to the laser beam, and simultaneously, the signal sent out from the signal receiving and processing circuit board 35 is transmitted out, the laser tube 23 is positioned in the laser transmitting assembly, the laser tube 23 transmits 650nm laser beam, when the laser beam passes through the dust detection section 35, the laser is divided into two parts under the influence of dust, the part which is not contacted with the dust is parallel light, the part which is contacted with the dust is scattered light, the concentration of the dust is positively correlated with the proportion of the scattered light, then the parallel light continues to move forward, the part of light passes through the narrow band light filter 26 and then enters the light shield 29, the light is absorbed by the light shield 29, the scattered light enters the optical lens after passing through the narrow band light filter 26, the optical lens has two optical lenses which are divided into a front lens and a rear lens, the scattered light after entering the front, then, the dust is converged on a photoelectric conversion device of the signal receiving and processing circuit board 35 under the refraction effect of the rear lens, the photoelectric conversion device converts a received light signal into a current signal, and then converts the current signal into a standard voltage signal (0-5V) through a collecting and converting circuit to be output, so that the concentration of dust in the environment to be detected is represented by the strength of the voltage signal, and the equipment does not need to be debugged or corrected in the whole dust concentration detection process.
Above is the utility model discloses realize dust detection's structural principle, but in the in-service use, only above structure can't constitute a complete equipment, so, will explain below the utility model the assembly structure of equipment.
As shown in fig. 1, a five-core spring shielding wire 1 is welded on a five-core aviation plug 3 through a rubber sleeve 2, and the five-core aviation plug 3 is plugged on a five-core aviation socket 5 and locked by a self-locking device; the five-core aviation socket 5 penetrates through a center hole of the front cover 7 and is fixed through the M8 thin nut 12, a five-core flat cable 13 is welded at a lead end of the five-core aviation socket 5, the other end of the five-core flat cable 13 is connected to the power circuit board 20 through a plug terminal, and an M3 x 30 screw I4 and an M3 x 30 screw II 6 respectively penetrate through a left fixing hole and a right fixing hole of the front cover 7 and are connected with a screw hole of the inner cover 16 in a matching mode. The M3 multiplied by 100 long screw I14 sequentially penetrates through the inner cover 16, the insulating pad column 15, the power circuit board 20, the 3 multiplied by 5 multiplied by 12 insulating pad column I17, the laser sleeve 22, the transition section 24 and the fixing hole on the detection section 25 to be matched and connected with the screw hole on the right sampling head 9, and the M3 multiplied by 100 long screw II 18 sequentially penetrates through the inner cover 16, the insulating pad column 19, the power circuit board 20, the 3 multiplied by 5 multiplied by 12 insulating pad column II 21, the laser sleeve 22, the transition section 24 and the fixing hole on the detection section 25 to be matched and connected with the screw hole on the left sampling head 9; the detection section 25 is arranged in the shell 8 and is arranged at a fixed position, and the left sampling head 9 and the right sampling head 9 are fixed at two sides of the detection section; the laser tube 23 is fixed in the laser sleeve 22, the inner hole of the laser sleeve 22 is in a micro-conical design, which is beneficial to the tight fit and fixation of the laser tube 23, and the power line of the laser tube 23 is connected to the power circuit board 20 through a connector; the M3 multiplied by 75 right long screw 38 passes through the rear cover 11, the circuit board cover 36, the signal receiving and processing circuit board 35, the circuit board base 34, the lens sleeve 32, the shading seat 30, the through hole 28 and the lower fixing hole of the detection section 25 in sequence to be matched and connected with the screw hole on the right sampling head 9; the M3 multiplied by 75 long left-side screw 39 sequentially passes through the rear cover 11, the circuit board cover 36, the signal receiving and processing circuit board 35, the circuit board base 34, the lens sleeve 32, the shading seat 30, the through hole 28 and the lower fixing hole of the detection section 25 to be matched and connected with the screw hole on the left sampling head 9; the light shield 29 is arranged at the center of the light shield seat 30 and fixed by glue, and the surface of an inner space formed by the light shield 29 and the light shield seat 30 is pasted with light absorption cloth for light absorption treatment to avoid secondary scattering of a light source; the front optical lens 31 and the rear optical lens 33 are respectively arranged in grooves at two ends of the middle part of the lens sleeve 32, the front optical lens 31 is fixed by the lens sleeve 32 and the shading seat 30, and the rear optical lens 33 is fixed by the lens sleeve 32 and the circuit board base 34; an Ethylene Propylene Diene Monomer (EPDM) cushion 37 is added between the circuit board cover 36 and the rear cover 11 so as to compress the internal devices and ensure that the internal devices are not compressed excessively.
Above-mentioned structural scheme can be with as an alternative technical scheme through above-mentioned structure the utility model discloses complete assembly makes technical field personnel can realize according to above-mentioned technical scheme the technical effect.
Above-mentioned technical scheme has only embodied the utility model discloses technical scheme's preferred technical scheme, some changes that this technical field's technical personnel probably made to some parts wherein have all embodied the utility model discloses a principle belongs to within the protection scope of the utility model.
Claims (10)
1. A dust concentration detection device for near-forward light scattering comprises a shell, a front cover and a rear cover which are arranged at two ends of the shell, and a five-core spring shielding wire which passes through the front cover and is communicated with the interior of the front cover, its characterized in that, be provided with nearly preceding light detection structure in the shell, nearly forward light detection mechanism includes, set up in the shell is inside and by the power supply of five core spring shielded wires is used for transmitting laser's laser tube, set up in laser tube laser emission end one side and pass the external sampling head of shell intercommunication, set up in the narrow band filter that the sampling head one side is used for filtering light, set up in the lens hood that the narrow band filter rear end is used for shielding part light ray, set up in the optical lens that the seat rear end of hiding light is used for carrying out optical treatment to the light, set up in the optical lens rear end and be used for turning into the signal reception processing circuit board of signal of telecommunication with the light intensity signal.
2. The device for detecting dust concentration through near-forward light scattering according to claim 1, wherein the sampling head has a hollow structure, a detection section is disposed in the housing and at a position corresponding to the sampling head, the detection section is used for clamping and fixing the sampling head, a cavity is formed in the middle of the detection section, the cavity is communicated with the hollow position of the sampling head, and dust particles in the external environment can enter the cavity in the middle of the detection section through the channel.
3. The dust concentration detection device of claim 2, wherein a transition section is disposed between the laser tube and the detection section, and the transition section is hollow for the laser of the laser tube to pass through.
4. The apparatus as claimed in claim 2, wherein the laser beam is scattered by the light split from the rear of the detection section to form scattered light, and the scattered light is directed to the optical lens and optically processed.
5. The dust concentration detection device of claim 4, wherein the number of the optical lenses is two, the optical lenses are hemispheric, the hemispheres of the two optical lenses are oppositely arranged, the scattered light passes through the first lens, the scattered light is changed into a parallel state from a divergent state, and the scattered light reaches the second lens, is changed into a light-gathering state from the parallel state and is focused on the signal receiving and processing circuit board.
6. The dust concentration detection device of claim 1, wherein the laser tube is disposed inside the housing and near the five-core spring shielding line, and the laser beam emitted by the laser tube is 650 nm.
7. The device for detecting dust concentration through near-forward light scattering according to claim 1, wherein a light-shielding seat is disposed between the light-shielding cover and the optical lens, the light-shielding cover is fixed on the light-shielding seat through glue, and a light-absorbing cloth is attached to a surface of an inner space formed by the light-shielding cover and the light-shielding seat to absorb light so as to prevent secondary scattering from occurring in a light source.
8. The apparatus according to claim 7, wherein the light shield and the light shield seat are used for shielding the parallel light left after the laser beam is scattered by the airborne dust, and the part of the parallel light is absorbed by the light shield and is not scattered.
9. The apparatus as claimed in claim 1, wherein the narrow band filter only allows 650nm laser beam to pass through, and filters out peripheral natural light from entering the optical lens at the rear end.
10. The dust concentration detection device of claim 1, wherein the signal receiving and processing circuit board comprises a photoelectric conversion device and a collecting and converting circuit, the photoelectric conversion device converts the received light signal into a current signal, and converts the current signal into a standard voltage signal (0-5V) through the collecting and converting circuit, and the standard voltage signal is output through the five-core spring shielding wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921213012.7U CN210720077U (en) | 2019-07-30 | 2019-07-30 | Dust concentration detection device of nearly forward light scattering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921213012.7U CN210720077U (en) | 2019-07-30 | 2019-07-30 | Dust concentration detection device of nearly forward light scattering |
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| Publication Number | Publication Date |
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| CN210720077U true CN210720077U (en) | 2020-06-09 |
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| CN201921213012.7U Active CN210720077U (en) | 2019-07-30 | 2019-07-30 | Dust concentration detection device of nearly forward light scattering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296920A (en) * | 2019-07-30 | 2019-10-01 | 常熟市鼎睿智能测控有限公司 | A kind of dust concentration detection device of nearly forward light scattering |
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2019
- 2019-07-30 CN CN201921213012.7U patent/CN210720077U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296920A (en) * | 2019-07-30 | 2019-10-01 | 常熟市鼎睿智能测控有限公司 | A kind of dust concentration detection device of nearly forward light scattering |
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