CN108613910B - Improved filter bag detection device - Google Patents
Improved filter bag detection device Download PDFInfo
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- CN108613910B CN108613910B CN201810419094.4A CN201810419094A CN108613910B CN 108613910 B CN108613910 B CN 108613910B CN 201810419094 A CN201810419094 A CN 201810419094A CN 108613910 B CN108613910 B CN 108613910B
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- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 239000000428 dust Substances 0.000 claims abstract description 141
- 230000007246 mechanism Effects 0.000 claims abstract description 21
- 238000007664 blowing Methods 0.000 claims abstract description 20
- 230000008021 deposition Effects 0.000 claims abstract description 4
- 239000004071 soot Substances 0.000 claims description 14
- 239000011521 glass Substances 0.000 claims description 12
- 238000007689 inspection Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 238000001914 filtration Methods 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/084—Testing filters
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides an improved filter bag detection device, and belongs to the technical field of machinery. The dust removal device solves the technical problems that the existing dust removal devices are huge, and a new product developed and researched is extremely inconvenient to test on the common dust removal devices. The improved filter bag detection device comprises a base and a box body fixed on the base, wherein the box body is divided into an upper box body and a lower box body; the lower part of the ash bucket is fixedly provided with an ash collecting box which is positioned in the lower box body, and one side of the ash collecting box is connected with an ash blowing mechanism for keeping dust dry and preventing dust deposition. The invention has the advantages of simple and accurate detection of the filtering effect and the service life of the novel filter bag developed and researched.
Description
The invention relates to a divisional application of an invention patent application with the application number of 201710637740X, which is filed on 31/7/2017 and is named as a filter bag testing machine.
Technical Field
The invention belongs to the technical field of machinery, and particularly relates to an improved filter bag detection device.
Background
When the dust-containing gas enters the dust remover from the air inlet, the dust-containing gas firstly touches the inclined plate and the baffle plate in the middle of the air inlet and the air outlet, the gas flow turns to flow into the dust hopper, and simultaneously the gas flow speed is slowed down, so that coarse particle dust in the gas directly flows into the dust hopper due to the inertia effect. The dust collection device plays a role in pre-collecting dust, the airflow entering the dust hopper is then folded upwards to pass through a filter bag with a metal framework inside, the dust is collected on the outer surface of the filter bag, the purified gas enters a cleaning chamber at the upper part of a filter bag chamber and is collected at an air outlet to be discharged, and in the process of purifying the dust-containing gas by a filter bag, the dust accumulated on the filter bag is more and more along with the increase of time, the resistance of the filter bag is increased, so that the air volume to be treated is gradually reduced, for normal work, the resistance is controlled within a certain range (140-170 mm water column), once the resistance exceeds the range, the filter bag needs to be subjected to dust removal, a pulse controller is used for sequentially triggering control valves to open pulse valves during dust removal, compressed air in an air bag is sprayed into corresponding filter bags through holes of a spray pipe through venturi tubes, the filter bags are suddenly expanded instantly, the dust accumulated on the surfaces of the filter bags is enabled to fall off, and the filter bags are restored to the initial state. The dust falls into the dust hopper and is discharged out of the machine body through the dust discharging system. Therefore, dust accumulated on the filter bag is periodically and pulse-sprayed to remove ash, purified gas normally passes through the filter bag, and the operation of a dust removal system is ensured.
The filter bag is one of the key technical products of the pulse dust collector, the filtering effect and the service life of the filter bag are the subject of continuous research, common dust collecting equipment is huge, and the new product developed and researched is extremely inconvenient to test on the common dust collecting equipment.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an improved filter bag detection device, which aims to solve the following problems: how to simply and accurately detect the filtering effect and the service life of the novel filter bag which is developed and researched.
The purpose of the invention can be realized by the following technical scheme: an improved filter bag detection device comprises a base and a box body fixed on the base, wherein the box body is divided into an upper box body and a lower box body; the lower part of the ash bucket is fixedly provided with an ash collecting box which is positioned in the lower box body, and one side of the ash collecting box is connected with an ash blowing mechanism for keeping dust dry and preventing dust deposition; a suction fan is fixed on both sides of the upper box body, one end of the suction fan is connected with the cavity of the dust collecting box, and the other end of the suction fan is connected with the cavity in the upper box body; a back-blowing mechanism for removing dust adsorbed on the filter bag is fixed at the top of the upper box body; the dust detection device comprises a cage frame, a base and a suction fan, wherein a first dust detector for detecting the concentration of dust in air is further fixed in the cage frame, a controller is fixed on the base, and the first suction fan and the first dust detector are connected with the controller through a control circuit.
The working principle of the invention is as follows: when a filter bag to be detected is sleeved on a cage, a soot blowing mechanism is started, dust in a soot collection box is dried and blown away, the dust is uniformly distributed in the air, a suction fan is started, the air with the dust in the soot collection box is sucked into an upper box body, the dust in the air is filtered out by the filter bag sleeved on the cage, clean air enters the cage, is detected by a dust detector, detected data are transmitted into a controller to detect the using effect of the filter bag, a certain amount of dust is accumulated on the filter bag, the dust attached to the filter bag is blown down to a dust hopper and enters the soot collection box from the dust hopper by starting a back blowing mechanism, then the dust is disturbed by the soot blowing mechanism and floats into the air, the dust is sucked into the upper box body by the suction fan again, the circulation is repeated until the dust detector arranged in the cage detects that the variation of the dust amount in the air reaches the air detection standard, and recording data in the middle. By the method, the filtering effect and the service life of the filter bag can be accurately detected. The controller is a PLC programmable controller. The controller is a commercially available product.
The cage is in a long cylinder shape. The long cylindrical cage frame is convenient for sleeving the filter bag, and meanwhile, the force applied in each direction is the same.
And an electromagnetic valve is fixedly arranged at the joint of the ash hopper and the ash collection box. The dust is prevented from entering the upper box body from the dust collecting box in the soot blowing process of the hot air blower, and detection data are prevented from being influenced.
The clamping mechanism comprises an annular clamping block, a clamping belt and a bolt, the annular clamping block is fixedly arranged at the top of the cage frame, an annular groove is formed in the annular clamping block, and the clamping belt is arranged in the annular groove in a surrounding mode; smuggle one end secretly and be equipped with connector one, and smuggle the other end secretly and be equipped with connector two, all set up threaded hole on connector one and the connector two, bolt threaded connection connector in the lump threaded connection connector two. The filtering bag is sleeved on the cage frame, the opening of the filtering bag is sleeved on the annular clamping block, and then the filtering bag is pressed by the clamping belt and is fixed by the bolt.
The soot blowing mechanism comprises a hot blower, the hot blower is fixed in the lower box body, an air outlet of the hot blower is connected with the soot collecting box, an air inlet of the hot blower penetrates through the lower box body to be communicated with the outside, and filter screens are fixed at the air inlet and the air outlet of the hot blower. The filter screen is fixed to prevent external dust from entering the dust collection box, and meanwhile, the dust in the integrated box is prevented from entering the hot air blower to influence the service life of the hot air blower. The hot air blower is used for drying and blowing away dust in the dust collecting box and simulating an external air environment to be measured. The hot air blower is a common commercial product.
The back-blowing mechanism comprises an air pump, a pulse electromagnetic valve, an air storage cylinder and a nozzle, the air storage cylinder is fixedly arranged at the top of the upper box body, the pulse electromagnetic valve is fixed on the air storage cylinder, the air pump is fixedly arranged on one side of the box body and is connected with the air storage cylinder through a pipeline, and the nozzle is connected with the air storage cylinder through an air pipe. The air pump is started to send air into the air storage cylinder, the air in the air storage cylinder is compressed through the pulse electromagnetic valve, then the compressed air is sprayed out from the nozzle, and dust attached to the filter bag is blown off.
The upper box body is provided with an observation port, the observation port is provided with a glass window, and the glass window is fixed on the upper box body in a hinged mode. The use condition of the filter bag can be observed through the glass window, and the glass window can be clamped to replace the filter bag.
The dust collecting box contains a second dust detector. And the dust content of each working environment can be simulated through the dust monitor II.
The electromagnetic valve, the air pump, the pulse electromagnetic valve and the second dust detector are connected with the controller through control lines. The solenoid valve is opened or closed, and the air pump and the pulse solenoid valve are opened or closed by the controller. The dust monitor transmits the collected data to the controller, and the controller converts the data into information.
The top of the inner side of the upper box body is provided with an illuminating lamp, the outer side of the upper box body is provided with a mechanical switch, and the illuminating lamp is connected with the mechanical switch through a circuit. When light is darker, can open the light through mechanical switch, will go up the box and illuminate, conveniently change and cross the filter bag, mechanical switch is not same circuit with control, so open the light and need not starting equipment, can open the light through mechanical switch like this at any time, can clear up the inside and change of box and cross the filter bag.
Compared with the prior art, the invention has the following advantages:
1. the suction fan continuously sucks air with dust into the upper box body, the air with dust is continuously filtered out from the filter bag arranged on the cage frame, the dust detector arranged in the cage frame accurately detects the dust amount contained in the air, the dust amount in the air is improved, data during recording is recorded, and the service life of the filter bag and the filter effect of the filter bag are detected.
2. The hot air blower is used for drying the dust entering the dust collection box and preventing the dust from being deposited, so that the working environment of the dust collection equipment can be simulated, and the accuracy of the service life detection of the filter bag is improved.
3. The dust in the dust collecting box can be recycled, the dust content in the dust collecting box can be accurately detected through the second dust detector, and the working environment of each place can be simulated by adding or reducing the amount of the dust.
Drawings
FIG. 1 is a schematic view of an improved filter bag inspection apparatus.
FIG. 2 is a front view of an improved filter bag inspection apparatus.
In the figure, 1, a base; 2. an upper box body; 2a, a lower box body; 3. an ash hopper; 4. a cage frame; 5. a dust collection box; 6. a suction fan; 7. a first dust detector; 8. a controller; 9. an electromagnetic valve; 10. an annular clamping block; 11. carrying; 12. a bolt; 13. a hot air blower; 14. a filter screen; 15. an air pump; 16. a pulse electromagnetic valve; 17. an air reservoir; 18. a nozzle; 19. a glass window; 20. a second dust detector; 21. an illuminating lamp; 22. and (4) a mechanical switch.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 and 2, an improved filter bag detection device comprises a base 1 and a box body fixed on the base 1, wherein the box body is divided into an upper box body 2 and an upper box body 2, and is characterized in that an ash bucket 3 is fixed between the upper box body 2 and a lower box body 2a, the ash bucket 3 is fixed between the upper box body 2 and the lower box body 2a in a welding manner, a cage 4 for sleeving a filter bag is fixed on the ash bucket 3, a clamping mechanism for clamping the filter bag is arranged at the upper part of the cage 4, and the top of the cage 4 is fixedly arranged on the box body in a welding manner; a dust collecting box 5 is fixedly arranged at the lower part of the dust hopper 3, the dust collecting box 5 is positioned in the lower box body 2a, and one side of the dust collecting box 5 is connected with a dust blowing mechanism for keeping dust dry and preventing dust deposition; a suction fan 6 is fixed on both sides of the upper box body 2, one end of the suction fan 6 is connected with the cavity of the dust collecting box 5, and the other end of the suction fan 6 is connected with the cavity inside the upper box body 2; the top of the upper box body 2 is provided with a back-blowing mechanism for removing dust adsorbed on the filter bag; a dust detector I7 for detecting the dust concentration in the air is further fixed in the cage 4, a controller 8 is fixed on the base 1, and the suction fan 6 and the dust detector I are connected with the controller 8 through a control circuit.
The cage 4 has a long cylindrical shape. The long cylindrical cage 4 is convenient for sleeving the filter bag, and the forces applied in all directions are the same.
An electromagnetic valve 9 is fixed on the joint of the ash bucket 3 and the ash collecting box 5. The dust is prevented from entering the upper box body 2 from the dust collecting box 5 in the soot blowing process of the hot air blower 13, and the detection data is prevented from being influenced.
The clamping mechanism comprises an annular clamping block 10, a clamping belt 11 and a bolt 12, the annular clamping block 10 is fixedly arranged at the top of the cage 4, an annular groove is formed in the annular clamping block 10, and the clamping belt 11 is arranged in the annular groove in a surrounding mode; smuggle 11 one end secretly and be equipped with connector one, and smuggle 11 other ends secretly and be equipped with connector two, all set up threaded hole on connector one and the connector two, bolt 12 threaded connection connector in the lump threaded connection connector two. The filter bag is placed over the cage 4, the opening of the filter bag is placed over the annular clamping block 10, and the clamping band 11 is then pressed against the filter bag and secured in place by means of the bolts 12.
The soot blowing mechanism comprises a hot blower 13, the hot blower 13 is fixed in the lower box body 2a, the air outlet of the hot blower 13 is connected with the soot collection box 5, the air inlet of the hot blower 13 penetrates through the lower box body 2a to be communicated with the outside, and a filter screen 14 is fixed at the air inlet and the air outlet of the hot blower 13. The filter 14 is fixed to prevent external dust from entering the dust collecting box and also prevent dust in the dust collecting box from entering the hot air blower 13, which affects the service life of the hot air blower 13. The hot air blower 13 is used for drying and blowing away the dust in the dust collecting box 5, and simulating the external air environment to be measured. The hot air blower 13 is a common commercially available machine.
The back flushing mechanism comprises an air pump 15, a pulse electromagnetic valve 16, an air storage tank 17 and a nozzle 18, wherein the air storage tank 17 is fixedly arranged at the top of the upper box body 2, the pulse electromagnetic valve 16 is fixedly arranged on the air storage tank 17, the air pump 15 is fixedly arranged at one side of the box body, the air pump 15 is connected with the air storage tank 17 through a pipeline, and the nozzle 18 is connected with the air storage tank 17 through an air pipe. The pulsed solenoid valve 16 is a commercially available device. And starting the air pump 15 to store air into the air storage cylinder 17, starting the pulse electromagnetic valve 16 when dust on the filter bag needs to be blown off, compressing the air flushed into the air storage cylinder 17 through the pulse electromagnetic valve 16, and then spraying out from the nozzle 18 to blow off the dust attached to the filter bag.
An observation port is formed in the upper box body 2, a glass window 19 is installed on the observation port, and the glass window 19 is fixed on the upper box body 2 in a hinged mode. The use condition of the filter bag can be observed through the glass window 19, and the glass window 19 can be clamped for replacing the filter bag.
The second dust detector 20 is contained in the second dust box 5. And the dust content of each working environment can be simulated through the dust monitor II. The second dust monitor is a common device available on the market.
The electromagnetic valve 9, the air pump 15, the pulse electromagnetic valve 16 and the second dust detector 20 are connected with the controller 8 through control lines. The electromagnetic valve 9 is opened or closed by the controller 8, and the air pump 15 and the pulse electromagnetic valve 16 are opened or closed. The second dust detector 20 transmits the collected data to the controller 8, and the controller 8 converts the data into information.
The top of the inner side of the upper box body is provided with an illuminating lamp 21, the outer side of the upper box body is provided with a mechanical switch 22, and the illuminating lamp 21 is connected with the mechanical switch 22 through a circuit. When light is darker, can open light 21 through mechanical switch 22, will go up the box and illuminate, conveniently change and cross the filter bag, mechanical switch 22 is not same circuit with control, so open light 21 and need not starting drive, can open light 21 through mechanical switch 22 like this at any time, conveniently clear up the inside and change of box and cross the filter bag.
The working principle of the invention is as follows: when a filter bag to be detected is sleeved on the cage 4, a hot air blower is started, dust in the dust collection box 5 is dried and blown away, the dust is uniformly distributed in the air, a suction fan 6 is started, air with dust in the dust collection box 5 is sucked into the upper box body 2, the dust in the air is filtered by the filter bag sleeved on the cage 4, clean air enters the cage 4 and is detected by a dust detector I7, detected data are transmitted to a controller 8 to detect the using effect of the filter bag, a certain amount of dust on the filter bag is accumulated, air is sent into an air storage cylinder 17 by starting an air pump 15, the air in the air storage cylinder 17 is compressed by a pulse electromagnetic valve 16, then the compressed air is sprayed out from a nozzle 18, the dust attached to the filter bag is blown off to the dust hopper 3 and returns to the dust collection box 5 from the dust hopper 3, then the dust is disturbed by the soot blowing mechanism and floats in the air, and is sucked into the upper box body 2 by the suction fan 6 again, and the operation is repeated in a reciprocating way until the dust detector I7 arranged in the cage 4 detects that the variation of the dust amount in the air reaches the air detection standard, and data is recorded in the middle. By the method, the filtering effect and the service life of the filter bag can be accurately detected. The dust monitor of the present invention is a commercially available instrument. The controller 8 is a PLC programmable controller 8, also a commercially available device.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although 1, the base is used more herein; 2. an upper box body; 2a, a lower box body; 3. an ash hopper; 4. a cage frame; 5. a dust collection box; 6. a suction fan; 7. a first dust detector; 8. a controller; 9. an electromagnetic valve; 10. an annular clamping block; 11. carrying; 12. a bolt; 13. a hot air blower; 14. a filter screen; 15. an air pump; 16. a pulse electromagnetic valve; 17. an air reservoir; 18. a nozzle; 19. a glass window; 20. a second dust detector; 21. an illuminating lamp; 22. mechanical switches, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (8)
1. An improved filter bag detection device comprises a base and a box body fixed on the base, wherein the box body is divided into an upper box body and a lower box body; the lower part of the ash bucket is fixedly provided with an ash collecting box which is positioned in the lower box body, and one side of the ash collecting box is connected with an ash blowing mechanism for keeping dust dry and preventing dust deposition; a suction fan is fixed on both sides of the upper box body, one end of the suction fan is connected with the cavity of the dust collecting box, and the other end of the suction fan is connected with the cavity in the upper box body; a back-blowing mechanism for removing dust adsorbed on the filter bag is fixed at the top of the upper box body; a first dust detector for detecting the concentration of dust in air is fixed in the cage, a controller is fixed on the base, the suction fan and the first dust detector are connected with the controller through a control circuit, and a second dust detector is contained in the dust collecting box; the top of the inner side of the upper box body is provided with an illuminating lamp, the outer side of the upper box body is provided with a mechanical switch, and the illuminating lamp is connected with the mechanical switch through a circuit.
2. An improved filter bag inspection device as claimed in claim 1 wherein said cage is cylindrical.
3. An improved filter bag detection device as claimed in claim 1, wherein a solenoid valve is fixed at the connection between the dust hopper and the dust collection box.
4. The improved filter bag detection device as claimed in claim 1, wherein the clamping mechanism comprises an annular clamping block, a clamping band and a bolt, the annular clamping block is fixedly arranged at the top of the cage frame, an annular groove is formed in the annular clamping block, and the clamping band is arranged in the annular groove in a surrounding manner; smuggle one end secretly and be equipped with connector one, and smuggle the other end secretly and be equipped with connector two, all set up threaded hole on connector one and the connector two, bolt threaded connection connector in the lump threaded connection connector two.
5. The improved filter bag detection device as claimed in claim 1, wherein the soot blowing mechanism comprises a hot blower fixed in the lower box, an air outlet of the hot blower is connected with the soot collection box, an air inlet of the hot blower passes through the lower box and is communicated with the outside, and a filter screen is fixed at the air inlet and the air outlet of the hot blower.
6. The improved filter bag detecting device according to claim 1, wherein the back-blowing mechanism comprises an air pump, a pulse solenoid valve, an air reservoir and a nozzle, the air reservoir is fixedly arranged at the top of the upper box body, the pulse solenoid valve is fixed on the air reservoir, the air pump is fixedly arranged at one side of the box body and is connected with the air reservoir through a pipeline, and the nozzle is connected with the air reservoir through an air pipe.
7. The improved filter bag detection device as claimed in claim 1, wherein the upper box body is provided with an observation opening, a glass window is installed on the observation opening, and the glass window is fixed on the upper box body in a hinged manner.
8. The improved filter bag detecting device as claimed in claim 6, wherein the solenoid valve, the air pump, the pulse solenoid valve and the dust detector are connected to the controller via control lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810419094.4A CN108613910B (en) | 2017-07-31 | 2017-07-31 | Improved filter bag detection device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710637740.XA CN107421870B (en) | 2017-07-31 | 2017-07-31 | A kind of filter bag test machine |
| CN201810419094.4A CN108613910B (en) | 2017-07-31 | 2017-07-31 | Improved filter bag detection device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710637740.XA Division CN107421870B (en) | 2017-07-31 | 2017-07-31 | A kind of filter bag test machine |
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| Publication Number | Publication Date |
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| CN108613910A CN108613910A (en) | 2018-10-02 |
| CN108613910B true CN108613910B (en) | 2020-06-16 |
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| CN201810419094.4A Active CN108613910B (en) | 2017-07-31 | 2017-07-31 | Improved filter bag detection device |
| CN201710637740.XA Active CN107421870B (en) | 2017-07-31 | 2017-07-31 | A kind of filter bag test machine |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710637740.XA Active CN107421870B (en) | 2017-07-31 | 2017-07-31 | A kind of filter bag test machine |
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| CN110018154A (en) * | 2019-04-26 | 2019-07-16 | 南京信息工程大学 | A kind of aerosol detection device and method based on laser induced breakdown spectroscopy |
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| CN108613910A (en) | 2018-10-02 |
| CN107421870B (en) | 2019-08-02 |
| CN107421870A (en) | 2017-12-01 |
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