CN107219345A - A kind of honeycomb fashion hopper determined for sludge specific resistance - Google Patents
A kind of honeycomb fashion hopper determined for sludge specific resistance Download PDFInfo
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- CN107219345A CN107219345A CN201710461527.8A CN201710461527A CN107219345A CN 107219345 A CN107219345 A CN 107219345A CN 201710461527 A CN201710461527 A CN 201710461527A CN 107219345 A CN107219345 A CN 107219345A
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- main cylinder
- cylinder
- specific resistance
- buchner funnel
- sludge
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- 239000010802 sludge Substances 0.000 title claims abstract description 45
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 238000000967 suction filtration Methods 0.000 claims description 13
- 239000007799 cork Substances 0.000 claims description 12
- 239000012780 transparent material Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 19
- 239000000706 filtrate Substances 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 8
- 238000002474 experimental method Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Analytical Chemistry (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a kind of honeycomb fashion hopper determined for sludge specific resistance, belong to field of measuring techniques, the characteristics of in order to level pressure filtering and accurate measured value, the hopper includes main cylinder, some auxiliary cylinders being arranged on inside main cylinder, the Buchner funnel for being arranged on main cylinder top and the flexible pipe being arranged on below Buchner funnel being placed on testing stand；The lower section of Buchner funnel is inserted inside main cylinder, and filter paper and the sludge of test are placed in Buchner funnel.The present invention is simple and easy to apply, and operability is good, and realize both needs to keep level pressure filtering in resistivity continuous mode, need to ensure the requirement of the accuracy and accuracy of the filtrate number of degrees again, disclosure satisfy that the measure requirement of all types of sludge specific resistances.
Description
Technical field
The invention belongs to field of measuring techniques, it is related to a kind of hopper, and in particular to a kind of to be used for what sludge specific resistance was determined
Honeycomb fashion hopper.
Background technology
With sharply increasing for sludge of sewage treatment plant amount, Treatment of Sludge is increasingly becoming each sewage disposal with the problem of disposal
The focus and difficult point of unit.《Municipal sewage plant's sewage sludge discharge standard》(GJ3025-1993) clear stipulaties
Sludge from wastewater treatment plant in factory after stable processing preferably carries out dewater treatment, and the moisture content of dehydrated sludge should be less than
80%.
The important indicator for weighing sludge filtration dewatering is exactly sludge specific resistance, and its physical significance is：The dirt of unit mass
Resistance when mud is filtered under a certain pressure in unit filter area.Sludge specific resistance is bigger, and strainability is poorer.Sludge specific resistance
Effect be the different sludge of comparison (or same sludge is added after different amounts of intermixture) strainability so that sludge dewatering
Type selecting reference is provided.
Sludge specific resistance measurement device is generally used in each colleges and universities and R＆D institution, and its performance determines sludge specific resistance measured value
Accuracy.In practice, experimental provision, which often exists, frequently stops car, the shortcomings of measurement error is larger, particularly crucial to fill
Hopper is put, in the process must be by due to needing record corresponding sludge filtration liquid product in the same time in experimentation
Physical filtering equipment is stopped, ability accurate recording numerical value, but theoretical calculation requires that physical filtering pressure is definite value, and then the two is produced
Raw contradiction, this namely current finding equipment effect undesirable bottleneck.
In terms of patent, tight wide grade (2012) of family etc. authorizes a kind of multi-connected sludge specific resistance measurement device, is characterized in energy
More than enough group is tested simultaneously, improves the efficiency of experiment, is relatively adapted to the multigroup student of colleges and universities and is carried out experimental teaching simultaneously, but many
Sets of Measurement cylinder share same pumping and filtering device easily cause experimental pressure inconsistent (fluid linear loss) and injure all it is scarce
Point, reduces efficiency on the contrary.
Yellow officials loyal to his sovereign etc. (2012) disclose a kind of single specific resistance measurement device, and it is mainly characterized by using centrifugal filtration, kept away
Exempted from the instability problem of vacuum filter, and during centrifugation apparatus constant speed open, it is ensured that level pressure filters this crucial bar
Part, but still there is the problem of filtrate number of degrees are unstable.
Zhu little Lin etc. (2013) discloses a kind of single specific resistance measurement device, and it is mainly characterized by extruding using stroke type
Filter, the filtrate number of degrees are not solved the problems, such as still, and equipment and process are complex, are unfavorable for determining dress as general sludge specific resistance
Put.
Ou Yangzhuozhi etc. (2016) has applied for a kind of two specific resistance measurement device, and it is mainly characterized by using hand piston bar
Press filtration, and can each device of flexible modulation height, assembling can be determined as portable resistivity and be used.But originated for filter pressure
And size is not clearly stated.
Prior art or equipment are exactly mainly pattern, type selecting and the filter pressure species select permeability of hopper device, though
Resistivity experimentation so can be achieved, and level pressure can be kept to filter substantially, but the accuracy and accuracy of experiment are difficult to ensure that.
Because resistivity requirement of experiment is except being level pressure filtering, in addition it is also necessary to corresponding sludge filtration filter at the time of different during record filtering
Liquid is accumulated, and whether single device is determined or multi-joint measure device existing apparatus, and single resistivity, which is determined, uses same hopper,
Then the major defect of existing apparatus is embodied in：
(1) due to being level pressure filtering, filtrate is all the time during suction filtration drippage, and the filtrate page is in state of disturbance all the time,
Cause the filtrate volume at each moment not have accuracy and even result in larger error；
(2) due to being to accept the filtrate in whole filter process, it is desirable to which hopper has larger barrel dliameter, even if mistake
Filter later stage filtrate dropleting speed and the disturbance to liquid level are gradually decreased, and can not also embody the accuracy of reading.
The content of the invention
According to above the deficiencies in the prior art, the technical problems to be solved by the invention are to propose that one kind is used for sludge specific resistance
The honeycomb fashion hopper of measure, possesses level pressure filtering, the characteristics of measured value is accurate.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of honeycomb fashion hopper determined for sludge specific resistance, the hopper include being placed on main cylinder on testing stand,
Some auxiliary cylinders being arranged on inside main cylinder, the Buchner funnel for being arranged on main cylinder top and the flexible pipe being arranged on below Buchner funnel；
The lower section of Buchner funnel is inserted inside main cylinder, and filter paper and the sludge of test are placed in Buchner funnel.
The main cylinder is hollow columnar structures, and main cylinder includes cylinder and is arranged on the cover on cylinder top, the cover
Charging aperture is provided with, the lower section of Buchner funnel is inserted inside main cylinder by charging aperture.The lower outer of the Buchner funnel is provided with
Rubber cork.The rubber cork is pyramidal structure, and rubber cork is provided with through hole, and the lower section of Buchner funnel is inserted through through hole
Inside main cylinder.The auxiliary cylinder is cylindrical-shaped structure, and its radius is much smaller than the radius of main cylinder, and the barrel of auxiliary cylinder is provided with graduation mark.
The main cylinder and auxiliary cylinder are that transparent material is made.Several described auxiliary cylinders arrange the center of circle of annulus inside main cylinder in annular
Overlapped with the axis of main cylinder, the diameter parallel of the axis of auxiliary cylinder and main cylinder, the axis of the main cylinder of axial line distance of each auxiliary cylinder is equal,
The distance between the adjacent auxiliary cylinder of any two is equal.The cylinder barrel of the main cylinder is provided with suction filtration mouth.
Present invention has the advantages that:The present invention is according to pressure stability in sludge specific resistance continuous mode, and the liquid level number of degrees are stable accurate
True requirement, uses in cellular design, a main cylinder to key device hopper and installs multiple auxiliary cylinders, is keeping whole cylinder
(i.e. closed good), manual rotation delivery port, rotate to auxiliary cylinder at the time of record is needed on the premise of filter pressure is certain
Side, experiment can read the number of degrees of each auxiliary cylinder respectively after terminating, and exact value foundation is provided for experiment.
Brief description of the drawings
The mark in the content and figure expressed by this specification accompanying drawing is briefly described below：
The embodiment that Fig. 1 is the present invention is used for the front view for the honeycomb fashion hopper that sludge specific resistance is determined；
The embodiment that Fig. 2 is the present invention is used for the top view for the honeycomb fashion hopper that sludge specific resistance is determined；
Wherein, 1, main cylinder；2nd, auxiliary cylinder；3rd, Buchner funnel；4th, flexible pipe；5th, rubber cork；6th, suction filtration mouth.
Embodiment
It is the shape of embodiment of the invention such as involved each component, construction, each by the description to embodiment
Mutual alignment and annexation, the effect of each several part and operation principle, manufacturing process and operate with method between part etc.,
It is described in further detail, it is more complete, accurate to help those skilled in the art to have inventive concept of the invention, technical scheme
Really with deep understanding.
The invention provides a kind of honeycomb fashion hopper determined for sludge specific resistance, the hopper includes being placed on experiment
Main cylinder 1, some auxiliary cylinders 2 being arranged on inside main cylinder 1 on platform, it is arranged on the Buchner funnel 3 on main cylinder top and is arranged on Bu Shi
The flexible pipe 4 of the lower section of funnel 3.Filter paper and sludge are placed in Buchner funnel 3.
The main cylinder 1 is hollow columnar structures, and main cylinder 1 includes cylinder and is arranged on the cover on cylinder top, in order to be able to
Enough materials for enabling measurement enter inside main cylinder 1, and the cover is provided with charging aperture, and the lower section of Buchner funnel 3 is by entering
Material mouth is inserted inside main cylinder 1, in order to ensure the seal of main cylinder 1, and the lower outer of the Buchner funnel 3 is provided with rubber cork 5,
The rubber cork 5 is pyramidal structure, and rubber cork 5 is provided with through hole, through-bore axis and horizontal plane, through-bore axis and master
The axis of cylinder 1 is overlapped, and the lower section of Buchner funnel 3 is inserted inside main cylinder 1 through through hole, and Buchner funnel 3 can be in through hole around through hole
Axis is freely rotated, and rubber cork 5 blocks charging aperture, is kept closed.
The auxiliary cylinder 2 is cylindrical-shaped structure, and its radius is much smaller than the radius of main cylinder 1, and the barrel of auxiliary cylinder 2 is provided with scale
Line, for convenience of user's observation, the main cylinder 1 and auxiliary cylinder 2 are that transparent material is made, preferably glass or high polymer material
It is made.The center of circle that several auxiliary cylinders 2 arrange annulus inside main cylinder 1 in annular is overlapped with the axis of main cylinder 1, the axle of auxiliary cylinder 2
The diameter parallel of line and main cylinder 1, the axis of the main cylinder 1 of axial line distance of each auxiliary cylinder 2 is equal, between the adjacent auxiliary cylinder 2 of any two
Distance it is equal.It is preferred that auxiliary cylinder 2 quantity be 6.The length of flexible pipe 4 is more than between the axis of auxiliary cylinder 2 and the axis of main cylinder 1
Distance.The lower exit port of one end end Buchner funnel 3 of flexible pipe 4 is fixedly connected, flexible pipe 4 and the axis of Buchner funnel 3
Angle is that solid line is the present position of flexible pipe 4 in obtuse angle, Figure of description, and dotted line is the institute after Buchner funnel 3 rotates of flexible pipe 4
In position.
In order to carry out level pressure suction filtration experiment, the cylinder barrel of the main cylinder 1 is provided with suction filtration mouth 6, and suction filtration mouth 6 passes through
The external Suction filtration device of second flexible pipe determines the pressure in main cylinder 1 to carrying out taking out pressure in main cylinder 1.
Auxiliary cylinder 2 is placed within main cylinder 1, can be different according to the filtering property of sludge, increases and decreases the quantity of auxiliary cylinder 2.In Bu Shi
The filler neck position of funnel 3 sets rubber cork 5, then Buchner funnel 3 is (counterclockwise or clockwise) free to rotate, it is ensured that
The air-tightness of whole experiment process, that is, be always level pressure filtering.The position of auxiliary cylinder 2 is set to wait radius array, when rotation cloth
During family name's funnel 3, directly over each auxiliary cylinder 2 opening and it is not interfere with each other all the time in the stop place of each moment flexible pipe 4, improves filtrate
The accuracy of volume reading.The barrel dliameter of single auxiliary cylinder 2 is smaller, improves the accuracy of filtrate volume reading.It is of the invention simple easy
OK, operability is good, and realizing in resistivity continuous mode had both needed to keep level pressure filtering, need to ensure again the filtrate number of degrees accuracy and
The requirement of accuracy, disclosure satisfy that the measure requirement of all types of sludge specific resistances.
Embodiment：The present invention is directed primarily to complete the data acquisition of resistivity measure using hopper, and external pressure can
Different types of vaccum pump unit is selected according to actual needs as Suction filtration device.
Implementation process：(1) hopper air-tightness is checked.Whether the pipeline for first checking for outside Suction filtration device is complete, rubber
Whether cork 5 seals the filler neck of Buchner funnel 3 and main cylinder 1, by the filter paper of place mat appropriate size on Buchner funnel 3, filter paper
The small opening of all Buchner funnels 3 should be coincide and covered with the diameter of Buchner funnel 3, and spraying a small amount of distilled water with watering can soaks filter paper,
External vacuum pump about 2s is started, filter paper is close to rapidly if finding, air-tightness is good.
(2) pilot scale study pressure.Under the premise of air-tightness, suction filtration pressure, number are obtained by adjusting the valve of suction filtration mouth 6
Value is about smaller than experimental pressure by 1/3, it is proposed that more than 0.04Mpa, because being now also not added with sludge, the pressure of whole experimental period
To add pressure that vavuum pump after sludge shows as unique value, after this pressure is determined, whole experimental period must not change.
(3) data are obtained.Under the premise of air-tightness, rotation Buchner funnel 3 makes flexible pipe 4 be located at the upper of any one auxiliary cylinder 2
Side, adds 100mL and tests sludge in Buchner funnel 3, start vavuum pump, according to pre-set interval time it is corresponding when
Carve tiWhen filtering (start can be every 30s or 60s after 10s or 15s, filtering velocity slow down) writes down corresponding amount of filtrate in auxiliary cylinder 2
vi.Every moment ti, quickly rotating and (clockwise or counterclockwise, keep air-tightness) Buchner funnel 3 makes flexible pipe 4
Positioned at the top of adjacent auxiliary cylinder 2, rotation is carried out, until being filled into last auxiliary cylinder 2.Generally, six auxiliary cylinders are selected
2viCorresponding six moment tiResistivity (if not enough, can be solved by increasing auxiliary cylinder quantity) can be calculated.
The present invention is exemplarily described above in conjunction with accompanying drawing, it is clear that the present invention is implemented not by aforesaid way
Limitation, as long as the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress is employed, or without changing
Enter and the design of the present invention and technical scheme are directly applied into other occasions, within protection scope of the present invention.This hair
Bright protection domain should be determined by the scope of protection defined in the claims.
Claims (8)
1. a kind of honeycomb fashion hopper determined for sludge specific resistance, it is characterised in that：The hopper includes being placed on testing stand
On main cylinder (1), some are arranged on the internal auxiliary cylinder (2) of main cylinder (1), are arranged on the Buchner funnel (3) on main cylinder (1) top and set
Put the flexible pipe (4) below Buchner funnel (3)；The lower section of Buchner funnel (3) is inserted puts in main cylinder (1) inside, Buchner funnel (3)
Filter paper and the sludge of test are put, the barrel of the main cylinder (1) is provided with suction filtration mouth (6).
2. the honeycomb fashion hopper according to claim 1 determined for sludge specific resistance, it is characterised in that：The main cylinder
(1) it is hollow columnar structures, main cylinder (1) includes cylinder and is arranged on the cover on cylinder top, and the cover is provided with charging
Mouthful, main cylinder (1) inside is inserted in the lower section of Buchner funnel (3) by charging aperture.
3. the honeycomb fashion hopper according to claim 1 determined for sludge specific resistance, it is characterised in that：The Bu Shi leakages
The lower outer of bucket (3) is provided with rubber cork (5).
4. the honeycomb fashion hopper according to claim 3 determined for sludge specific resistance, it is characterised in that：The rubber is soft
It is pyramidal structure to fill in (5), and rubber cork (5) is provided with through hole, and the lower section of Buchner funnel (3) is inserted in main cylinder (1) through through hole
Portion.
5. the honeycomb fashion hopper according to claim 1 determined for sludge specific resistance, it is characterised in that：The auxiliary cylinder
(2) it is cylindrical-shaped structure, its radius is much smaller than the radius of main cylinder (1), and the barrel of auxiliary cylinder (2) is provided with graduation mark.
6. the honeycomb fashion hopper according to claim 1 determined for sludge specific resistance, it is characterised in that：The main cylinder
And auxiliary cylinder (2) is that transparent material is made (1).
7. the honeycomb fashion hopper according to claim 1 determined for sludge specific resistance, it is characterised in that：Described in several
The center of circle that auxiliary cylinder (2) arranges annulus inside the main cylinder (1) in annular is overlapped with the axis of main cylinder (1), the axis of auxiliary cylinder (2) and
The diameter parallel of main cylinder (1), the axis of the main cylinder of axial line distance (1) of each auxiliary cylinder (2) is equal, the adjacent auxiliary cylinder of any two (2)
The distance between it is equal.
8. the honeycomb fashion hopper according to claim 2 determined for sludge specific resistance, it is characterised in that：The main cylinder
(1) cylinder barrel is provided with suction filtration mouth (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710461527.8A CN107219345A (en) | 2017-06-16 | 2017-06-16 | A kind of honeycomb fashion hopper determined for sludge specific resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710461527.8A CN107219345A (en) | 2017-06-16 | 2017-06-16 | A kind of honeycomb fashion hopper determined for sludge specific resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107219345A true CN107219345A (en) | 2017-09-29 |
Family
ID=59950499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710461527.8A Pending CN107219345A (en) | 2017-06-16 | 2017-06-16 | A kind of honeycomb fashion hopper determined for sludge specific resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107219345A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0563640U (en) * | 1992-02-05 | 1993-08-24 | 日新製鋼株式会社 | Mounting base |
| CN101975972A (en) * | 2010-09-01 | 2011-02-16 | 河海大学 | Equivalent-time rainfall rain sample meter |
| CN202066854U (en) * | 2011-04-13 | 2011-12-07 | 陕西科技大学 | Sludge dehydration speed quick measuring device |
| CN202497729U (en) * | 2012-02-28 | 2012-10-24 | 江西大唐新材料开发有限公司 | Continuous ore pulp dehydrating and drying device |
| CN103193374A (en) * | 2013-05-03 | 2013-07-10 | 湖南品铸科技发展有限公司 | Sludge dewatering tempering agent and method for sludge dewatering by utilizing same |
| CN203249840U (en) * | 2013-04-02 | 2013-10-23 | 北京建筑工程学院 | Sludge specific resistance measuring device |
| CN204514911U (en) * | 2015-01-19 | 2015-07-29 | 无锡国联环保科技有限公司 | A kind of sludge specific resistance measurement mechanism |
| CN204758848U (en) * | 2015-06-25 | 2015-11-11 | 北京林业大学 | Sensor formula hyetometer of various intensity rainfalls of real -time measurement |
| CN106568618A (en) * | 2016-11-11 | 2017-04-19 | 天津中新安德科技有限公司 | Novel rainwater collector |
| CN206804651U (en) * | 2017-06-16 | 2017-12-26 | 安徽师范大学 | A kind of honeycomb fashion hopper for sludge specific resistance measure |
-
2017
- 2017-06-16 CN CN201710461527.8A patent/CN107219345A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0563640U (en) * | 1992-02-05 | 1993-08-24 | 日新製鋼株式会社 | Mounting base |
| CN101975972A (en) * | 2010-09-01 | 2011-02-16 | 河海大学 | Equivalent-time rainfall rain sample meter |
| CN202066854U (en) * | 2011-04-13 | 2011-12-07 | 陕西科技大学 | Sludge dehydration speed quick measuring device |
| CN202497729U (en) * | 2012-02-28 | 2012-10-24 | 江西大唐新材料开发有限公司 | Continuous ore pulp dehydrating and drying device |
| CN203249840U (en) * | 2013-04-02 | 2013-10-23 | 北京建筑工程学院 | Sludge specific resistance measuring device |
| CN103193374A (en) * | 2013-05-03 | 2013-07-10 | 湖南品铸科技发展有限公司 | Sludge dewatering tempering agent and method for sludge dewatering by utilizing same |
| CN204514911U (en) * | 2015-01-19 | 2015-07-29 | 无锡国联环保科技有限公司 | A kind of sludge specific resistance measurement mechanism |
| CN204758848U (en) * | 2015-06-25 | 2015-11-11 | 北京林业大学 | Sensor formula hyetometer of various intensity rainfalls of real -time measurement |
| CN106568618A (en) * | 2016-11-11 | 2017-04-19 | 天津中新安德科技有限公司 | Novel rainwater collector |
| CN206804651U (en) * | 2017-06-16 | 2017-12-26 | 安徽师范大学 | A kind of honeycomb fashion hopper for sludge specific resistance measure |
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Application publication date: 20170929 |
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