CN102103043A - Sampling device of gaseous contaminant in material crushing process - Google Patents
Sampling device of gaseous contaminant in material crushing process Download PDFInfo
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- CN102103043A CN102103043A CN 201010568334 CN201010568334A CN102103043A CN 102103043 A CN102103043 A CN 102103043A CN 201010568334 CN201010568334 CN 201010568334 CN 201010568334 A CN201010568334 A CN 201010568334A CN 102103043 A CN102103043 A CN 102103043A
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- sampling
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- comminutor
- gas
- gaseous contaminant
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- 238000005070 sampling Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000000463 material Substances 0.000 title claims abstract description 22
- 239000000356 contaminant Substances 0.000 title claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 36
- 239000000428 dust Substances 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 14
- TWADJGWUKGOPFG-UHFFFAOYSA-N 2-methoxy-5-methyl-1,3-diphenylbenzene Chemical compound COC1=C(C=2C=CC=CC=2)C=C(C)C=C1C1=CC=CC=C1 TWADJGWUKGOPFG-UHFFFAOYSA-N 0.000 claims abstract description 8
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 claims description 26
- 238000010521 absorption reaction Methods 0.000 claims description 19
- 150000002989 phenols Chemical class 0.000 claims description 14
- 229910000042 hydrogen bromide Inorganic materials 0.000 claims description 13
- 239000003610 charcoal Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 abstract 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 abstract 1
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 21
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 21
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 14
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 14
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 11
- 238000000197 pyrolysis Methods 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 6
- 238000010298 pulverizing process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000008096 xylene Substances 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000010793 electronic waste Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 206010020843 Hyperthermia Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 125000002490 anilino group Chemical class [H]N(*)C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- 230000031709 bromination Effects 0.000 description 1
- 238000005893 bromination reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000036031 hyperthermia Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011802 pulverized particle Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
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- Sampling And Sample Adjustment (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a sampling device of gaseous contaminant in the material crushing process, which comprises a crusher. The feeding hole of the crusher extends into a rotary barrel, and the discharge hole of the rotary barrel extends into a storing box. The storing box is communicated with a dust collecting cylinder, and the dust collecting cylinder is communicated with a draught fan through a dust removing bag. A draught fan is connected with a gas buffer pipe, and four sampling rubber pipes are fixed in the gas buffer pipe. The first sampling rubber pipe is connected with a first sampler through phenolic absorbing liquid, the second sampling rubber pipe is connected with the first sampler through brominated hydrogen absorbing liquid, the third sampling rubber pipe is connected with a second sampler through an activated charcoal absorbing pipe, and the fourth sampling rubber pipe is connected with the second sampler through a Tenax-GC pipe. Excess gas is exhausted from a gas diversion port. Aiming at gaseous contaminant possibly produced during crushing, the gas samplers are used for respectively sampling different materials at an exhaust port. The sampling device can ensure that the contaminant is effectively monitored and data information is obtained and has the advantage of simple structure.
Description
Technical field
The present invention relates to electronic waste resource treatment technique field, particularly a kind of sampling apparatus of material comminution process process gaseous contaminant.
Background technology
Circuit board is the important component part of electronic product, is present in all electric equipment productss.Along with the acceleration of popularizing and updating of electronic product, the generation of waste printed circuit board grows with each passing day.If take unsuitable disposal route, poisonous and harmful substance wherein can be brought harm to environment and health.On the other hand, the material such as metallic copper, glass fibre and the small amount of precious metals etc. that contain more recyclable utilization in the circuit board.The most frequently used recycling technology is a mechanical approach both at home and abroad at present, is about to carry out sorting after circuit board is pulverized, and reclaims metal and nonmetallic materials respectively.But in crushing process, because continuous, the high speed impact of material, laminar composite-the localized hyperthermia that can cause circuit board waste material-high tenacity, very likely make the flame-retarded resin pyrolysis in the circuit board, thereby release gaseous contaminant, owing to the dust of a large amount of loss, it is for operator and the potential serious threat of surrounding environment simultaneously.Because it is the system of an open circuit that circuit board is pulverized, and it is intermitten service, conventional method is difficult to the gas of loss is captured and analyzes, generally, gaseous contaminant is explored by taking the intensification pyrolytic reaction of thermogravimetric-infrared or cracking-when infrared experimental simulation circuit board is pulverized.Someone comes thermal decomposition mechanism in the analog circuit board crushing process by the method for pyrolysis epoxy glass cloth (FR-4), infer the pulverizing pyrolysis situation of circuit board indirectly, and the weightlessness of pyrolytic process is changed the method by thermogravimetric-infrared and pyrolysis product is analyzed, and infers that the pyrolysis gas product is mainly by CO, CO
2, H
2O and hydrocarbon composition also exist benzene and substituent thereof in addition.The pedestrian is according to the thermal effect of shock zone and the similarity of pulverized particles local surfaces thermal effect mechanism under impact comminution in the test of drop impact wiring board, set up the intensification model of wiring board in crushing process earlier, and carry out pyrolysis according to this model and test, and then analyze the gas that pyrolysis produces.This research is all tested FR-1 type and FR-4 type wiring board, thinks that the temperature-rise effect of FR-4 type circuit board is remarkable than the FR-1 template, and its pyrolysis product mainly contains benzene series thing, hydro carbons, phenyl amines and aldehydes matter.Existing release characteristic and study on monitoring at pollutant in the electronic waste material crushing process only limit to simulations such as thermogravimetric, cracking, lack the support of real data, and prevention and cure of pollution work can't effectively be carried out.Yet at the material crushing process, particularly in the actual crushing process of waste printed circuit board electron-like waste material, the release of pollutant and sample Sampling techniques and device still do not have the research precedent.
Summary of the invention:
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of sampling apparatus of material comminution process process gaseous contaminant, can make the pollutant in the circuit board crushing process effectively be monitored and obtain data information, have advantage of simple structure.
In order to achieve the above object, the technical scheme taked of the present invention is as follows:
A kind of sampling apparatus of material comminution process process gaseous contaminant, comprise comminutor, comminutor turning barrel 2 inner chambers are stretched in the bottom of the charging aperture 1 of comminutor, the discharging opening of comminutor turning barrel 2 stretches in the screen underflow container 3, one side of screen underflow container 3 is passed comminutor shell 7 and dust collection tube 4 tops one side UNICOM, the top of dust collection tube 4 is by the bottom UNICOM of dust-removal cloth-bag 5 and induced draft fan 6, the gas outlet of induced draft fan 6 is passed comminutor shell 7 tops and is connected gas buffer pipe 8, four sampling sebific ducts are fixed in the gas buffer pipe 8, the first sampling sebific duct joins by the first input end of the phenols absorption liquid 10 and first sampling thief 14, the second sampling sebific duct joins by second input end of the hydrogen bromide absorption liquid 11 and first sampling thief 14, the 3rd sampling sebific duct joins by the first input end of the charcoal absorption pipe 12 and second sampling thief 15, the 4th sampling sebific duct joins by second input end of Tenax-GC pipe 13 and second sampling thief 15, and unnecessary gas is discharged from the gas diffluence pass 9 on the gas buffer pipe 8.
Described comminutor turning barrel 2, screen underflow container 3, dust collection tube 4, dust-removal cloth-bag 5, induced draft fan 6 and comminutor shell 7 all are in the sealing negative pressure state.
Principle of work of the present invention is:
Gas enters comminutor turning barrel 2 inner chambers with material from charging aperture 1, material after the pulverizing enters in the screen underflow container 3, gas is then extracted out by induced draft fan 6 through dust collection tube 4 and dust-removal cloth-bag 5 from the ventilating opening of bottom side, behind gas buffer pipe 8, be split into four parts, the suction of first by first sampling thief 14 obtains first sampling after being absorbed 10 by the phenols absorption liquid, the suction of second portion by first sampling thief 14 obtains second sampling after being absorbed by hydrogen bromide 11, third part obtains the 3rd sampling after being adsorbed by charcoal absorption pipe 12 by the suction of second sampling thief 15, the 4th part obtains the 4th sampling after being adsorbed by Tenax-GC pipe 13 by the suction of second sampling thief 15, at issuable gaseous contaminant in pulverizing, with gas sampler different materials is sampled respectively at exhausr port.
Because design of the present invention can make the pollutant in the circuit board crushing process effectively be monitored and obtain data information, has advantage of simple structure.
Description of drawings
Accompanying drawing is a structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done detailed description.
With reference to accompanying drawing, a kind of sampling apparatus of material comminution process process gaseous contaminant, comprise comminutor, comminutor turning barrel 2 inner chambers are stretched in the bottom of the charging aperture 1 of comminutor, the discharging opening of comminutor turning barrel 2 stretches in the screen underflow container 3, one side of screen underflow container 3 is passed comminutor shell 7 and dust collection tube 4 tops one side UNICOM, the top of dust collection tube 4 is by the bottom UNICOM of dust-removal cloth-bag 5 and induced draft fan 6, the gas outlet of induced draft fan 6 is passed comminutor shell 7 tops and is connected gas buffer pipe 8, four sampling sebific ducts are fixed in the gas buffer pipe 8, the first sampling sebific duct joins by the first input end of the phenols absorption liquid 10 and first sampling thief 14, the second sampling sebific duct joins by second input end of the hydrogen bromide absorption liquid 11 and first sampling thief 14, the 3rd sampling sebific duct joins by the first input end of the charcoal absorption pipe 12 and second sampling thief 15, the 4th sampling sebific duct joins by second input end of Tenax-GC pipe 13 and second sampling thief 15, and unnecessary gas is discharged from the gas diffluence pass 9 on the gas buffer pipe 8.
Described comminutor turning barrel 2, screen underflow container 3, dust collection tube 4, dust-removal cloth-bag 5, induced draft fan 6 and comminutor shell 7 all are in the sealing negative pressure state.
Principle of work of the present invention is:
Gas enters comminutor turning barrel 2 chambeies with material from charging aperture 1, material after the pulverizing enters in the screen underflow container 3, gas is then extracted out by induced draft fan 6 through dust collection tube 4 and dust-removal cloth-bag 5 from the ventilating opening of bottom side, behind gas buffer pipe 8, be split into four parts, the suction of first by first sampling thief 14 obtains first sampling after being absorbed 10 by the phenols absorption liquid, the suction of second portion by first sampling thief 14 obtains second sampling after being absorbed by hydrogen bromide 11, third part obtains the 3rd sampling after being adsorbed by charcoal absorption pipe 12 by the suction of second sampling thief 15, the 4th part obtains the 4th sampling after being adsorbed by Tenax-GC pipe 13 by the suction of second sampling thief 15, at issuable gaseous contaminant in pulverizing, with gas sampler different materials is sampled respectively at exhausr port.
Further the present invention is further described below in conjunction with specific embodiment.
Embodiment 1, adopts the gaseous contaminant of this device to test FR-4 type copper-clad plate in crushing process.Target to be measured: phenolic compound, hydrogen bromide, benzene,toluene,xylene, ethylbenzene, styrene.Phenols absorption liquid, hydrogen bromide absorption liquid and charcoal absorption pipe sampling rate are 0.5L/min, and Tenax-GC pipe sampling rate is 0.3L/min, and the sampling time is 40min, and this moment, pulverized quality of material was 1.8kg.After sampling is finished, further carry out analytical test, detection limit requires: toluene, ethylbenzene, dimethylbenzene, styrene 0.004mg/m
3, phenols 0.03mg/m
3, hydrogen bromide 0.10mg/m
3Analysis result is: benzene 0.140mg/m
3, toluene 0.014mg/m
3, ethylbenzene 0.011mg/m
3, dimethylbenzene 0.033mg/m
3, styrene does not detect (＜0.004mg/m
3), hydrogen bromide does not detect (＜0.10mg/m
3), phenols does not detect (＜0.03mg/m
3)
Embodiment 3, adopt the gaseous contaminant of FR-4 type circuit board in crushing process of this device to test band components and parts.Target to be measured: phenolic compound, hydrogen bromide, benzene,toluene,xylene, ethylbenzene, styrene.The employing process is identical with embodiment 1 with analysis test method.Analysis result is: benzene 0.248mg/m
3, toluene 0.007mg/m
3, ethylbenzene 0.013mg/m
3, dimethylbenzene 3.13mg/m
3, styrene 0.023mg/m
3, hydrogen bromide does not detect (＜0.10mg/m
3), phenols does not detect (＜0.03mg/m
3).
In the accompanying drawing: 1 is charging aperture; 2 is the pulverizer turning barrel; 3 are the lower thing storage of sieve case; 4 is the dust collection tube; 5 is dust-removal cloth-bag; 6 is the air inducing machine; 7 is disintegrator shell; 8 is the gas buffer pipe; 9 is gas diverter; 10 is the phenols absorption liquid; 11 is bromination hydrogen absorption liquid; 12 are the charcoal absorption pipe; 13 are the Tenax-GC pipe; 14 is first sampler; 15 is second sampler.
Claims (2)
1. the sampling apparatus of a material comminution process process gaseous contaminant, comprise comminutor, it is characterized in that: comminutor turning barrel (2) inner chamber is stretched in the bottom of the charging aperture of comminutor (1), the discharging opening of comminutor turning barrel (2) stretches in the screen underflow container (3), one side of screen underflow container (3) is passed comminutor shell (7) and dust collection tube (4) top one side UNICOM, the top of dust collection tube (4) is by the bottom UNICOM of dust-removal cloth-bag (5) and induced draft fan (6), the gas outlet of induced draft fan (6) is passed comminutor shell (7) top and is connected gas buffer pipe (8), four sampling sebific ducts are fixed in the gas buffer pipe (8), the first sampling sebific duct joins by the first input end of phenols absorption liquid (10) and first sampling thief (14), the second sampling sebific duct joins by second input end of hydrogen bromide absorption liquid (11) and first sampling thief (14), the 3rd sampling sebific duct joins by the first input end of charcoal absorption pipe (12) and second sampling thief (15), the 4th sampling sebific duct joins by second input end of Tenax-GC pipe (13) and second sampling thief (15), and unnecessary gas is discharged from the gas diffluence pass (9) on the gas buffer pipe (8).
2. the sampling apparatus of a kind of material comminution process process gaseous contaminant according to claim 1 is characterized in that: described comminutor turning barrel (2), screen underflow container (3), dust collection tube (4), dust-removal cloth-bag (5), induced draft fan (6) and comminutor shell (7) all are in the sealing negative pressure state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105683340A CN102103043B (en) | 2010-11-29 | 2010-11-29 | Sampling device of gaseous contaminant in material crushing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105683340A CN102103043B (en) | 2010-11-29 | 2010-11-29 | Sampling device of gaseous contaminant in material crushing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102103043A true CN102103043A (en) | 2011-06-22 |
| CN102103043B CN102103043B (en) | 2012-07-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105683340A Expired - Fee Related CN102103043B (en) | 2010-11-29 | 2010-11-29 | Sampling device of gaseous contaminant in material crushing process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102103043B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175751A (en) * | 2013-04-16 | 2013-06-26 | 武汉钢铁(集团)公司 | Method and device for measuring dust flying index by simulating coaling thermal state of coke oven in laboratory |
| CN103196708A (en) * | 2013-03-14 | 2013-07-10 | 深圳国技仪器有限公司 | Intelligent comprehensive air sampler |
| CN104729892A (en) * | 2015-03-24 | 2015-06-24 | 南京埃森环境技术有限公司 | PM2.5 (Particulate Matter 2.5) source analyzing and sampling device based on multichannel parallel feedback control |
| CN107457024A (en) * | 2017-08-03 | 2017-12-12 | 合肥念萍电子商务有限公司 | Feed ingredient rubbing crusher with sampling detection mechanism |
| CN111735917A (en) * | 2020-08-25 | 2020-10-02 | 南京锦华机械制造有限公司 | Formaldehyde detection device for building material |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5683040A (en) * | 1995-05-18 | 1997-11-04 | Daimler-Benz Ag | Method for recycling waste from printed circuit board assemblies from electrical and electronic devices |
| WO2002032988A1 (en) * | 2000-10-14 | 2002-04-25 | Tan-Tan Co., Ltd. | Extracting pulverized plastic matter from waste pcb |
| CN1701850A (en) * | 2005-07-22 | 2005-11-30 | 清华大学 | Dedicated low temperature breaking equipment for printed circuit board |
| CN2746981Y (en) * | 2004-07-26 | 2005-12-21 | 大连力达环境工程有限公司 | Equipment for treating, breaking and absorbing waste daylight lamps |
| JP2006116423A (en) * | 2004-10-21 | 2006-05-11 | Mitsui & Co Ltd | Method for sorting and separating pcb-containing electrical devices |
| CN101716588A (en) * | 2009-12-31 | 2010-06-02 | 湖南万容科技有限公司 | Waste circuit board recovery system |
-
2010
- 2010-11-29 CN CN2010105683340A patent/CN102103043B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5683040A (en) * | 1995-05-18 | 1997-11-04 | Daimler-Benz Ag | Method for recycling waste from printed circuit board assemblies from electrical and electronic devices |
| WO2002032988A1 (en) * | 2000-10-14 | 2002-04-25 | Tan-Tan Co., Ltd. | Extracting pulverized plastic matter from waste pcb |
| CN2746981Y (en) * | 2004-07-26 | 2005-12-21 | 大连力达环境工程有限公司 | Equipment for treating, breaking and absorbing waste daylight lamps |
| JP2006116423A (en) * | 2004-10-21 | 2006-05-11 | Mitsui & Co Ltd | Method for sorting and separating pcb-containing electrical devices |
| CN1701850A (en) * | 2005-07-22 | 2005-11-30 | 清华大学 | Dedicated low temperature breaking equipment for printed circuit board |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196708A (en) * | 2013-03-14 | 2013-07-10 | 深圳国技仪器有限公司 | Intelligent comprehensive air sampler |
| CN103175751A (en) * | 2013-04-16 | 2013-06-26 | 武汉钢铁(集团)公司 | Method and device for measuring dust flying index by simulating coaling thermal state of coke oven in laboratory |
| CN104729892A (en) * | 2015-03-24 | 2015-06-24 | 南京埃森环境技术有限公司 | PM2.5 (Particulate Matter 2.5) source analyzing and sampling device based on multichannel parallel feedback control |
| CN107457024A (en) * | 2017-08-03 | 2017-12-12 | 合肥念萍电子商务有限公司 | Feed ingredient rubbing crusher with sampling detection mechanism |
| CN111735917A (en) * | 2020-08-25 | 2020-10-02 | 南京锦华机械制造有限公司 | Formaldehyde detection device for building material |
| CN111735917B (en) * | 2020-08-25 | 2020-12-15 | 山东建业工程科技有限公司 | Formaldehyde detection device for building material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102103043B (en) | 2012-07-25 |
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