CN105738150B - A kind of submerged plant harvester and submerged plant acquisition method - Google Patents
A kind of submerged plant harvester and submerged plant acquisition method Download PDFInfo
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- CN105738150B CN105738150B CN201610192072.XA CN201610192072A CN105738150B CN 105738150 B CN105738150 B CN 105738150B CN 201610192072 A CN201610192072 A CN 201610192072A CN 105738150 B CN105738150 B CN 105738150B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention belongs to water plants to acquire field, and in particular to a kind of submerged plant harvester and submerged plant acquisition method.The submerged plant harvester, including hollow iron pipe, screw and rotary-cut sampling head, the lower end of hollow iron pipe can be connect with the threaded upper ends of the connecting rod one of rotary-cut sampling head, the lower end of the connecting rod one of rotary-cut sampling head is fixedly installed blade, snap ring is fixedly installed in the inner wall circumferential direction on hollow iron pipe top, the upper end opening of the lower part of screw from hollow iron pipe inserts into the inner, the upper end of screw is fixedly installed handle, matched screw-casing is arranged on screw, screw-casing is located in hollow iron pipe and is provided with the latch that can be engaged with snap ring on its lower face, the rotary-cut sampling head is suitable for the acquisition to longer large-scale submerged plant, the harvester also has gripping-type sampling head and corresponding control structure, suitable for the acquisition to small-sized submerged plant.Device and method provided by the invention has many advantages, such as that applicability is wide, sampling is accurate convenient.
Description
Technical field
The invention belongs to water plants to acquire field, and in particular to a kind of submerged plant harvester and submerged plant acquisition
Method.
Background technology
Submerged plant is most important primary producer in lake ecosystem, and type enriches, it is wide to be distributed, and is fish
Class, zoobenthos etc. have built good habitat, and important function is played to stablizing lake ecosystem, meanwhile, heavy water
For plant also to lake clear water state is kept to play positive effect, many researchs think that submerged plant occupies excellent in shallow lake
During gesture, nitrogen ＆ phosphorus release in deposit can be inhibited, reduce that water body nitrogen, phosphorus are horizontal, and control algae is largely proliferated, make lake to good
Property direction is developed.So group's composition, distribution and the biomass of lake submerged plant through water often become reflection lake ecological health shape
The important indicator of condition.
Therefore, effective Sampling Survey is carried out to submerged plant, obtains firsthand data data, not only it will be seen that heavy water
The distribution characteristics of plant also contributes to inquire into the changing rule and influence factor of submerged plant, and then is Lake Water ecology
Subregion, Classification Management and the utilization of submerged plant resource, protection and the recovery of system provide foundation.
Submerged plant harvester is also fewer at present, and has used many deficiencies：Grab bucket type adopts straw articles, because nothing is stretched
Enter the hard operating lever in water, thus using when need throwing, sampling spot cannot accurately control, and heavier mass, and operation is very
Arduously, and when sampling sampling area sample cannot be obtained to greatest extent；Water plant is pressed from both sides, equally without hard operating lever, though quality is slightly
Gently, big biomass submerged plant acquisition that is relatively easy, but being not suitable for longer is operated.
Invention content
For the deficiencies in the prior art, the present invention provides a kind of submerged plant harvester, can solve existing
Have in technology sample when be not applied for different sampling environments, sampling spot cannot accurately control, operate arduously or cannot be right
The problems such as longer submerged plant is acquired.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of submerged plant harvester, including cored iron
Pipe, screw and rotary-cut sampling head, the lower end of the hollow iron pipe can be with the threaded upper ends of the connecting rod one of the rotary-cut sampling head
Connection, the lower end of the connecting rod one of the rotary-cut sampling head is fixedly installed blade, is covered on the outer wall on the hollow iron pipe top
Equipped with bearing handle, snap ring is fixedly installed in the inner wall circumferential direction on the hollow iron pipe top, the central through hole of the snap ring is straight
Diameter is more than the outer diameter of the screw, and the lower part of the screw is from the upper end opening of the hollow iron pipe along the hollow iron pipe
Mandrel line inserts into the inner, and the top of the screw is located at outside the hollow iron pipe and the upper end of the screw is fixedly installed hand
Handle, matched screw-casing is arranged on the screw, and the screw-casing is located in the hollow iron pipe and on its lower face
The latch that can be engaged with the snap ring is provided with, the screw is pushed by handle, the screw can be driven under the screw-casing
It moves and it is made to be engaged with the snap ring, continue to push the screw, the screw can make described in the screw-casing and snap ring drive
Hollow iron pipe and rotary-cut sampling head are rotated by rotary shaft of the central axis of the hollow iron pipe, and the blade rotates with cutting
Submerged plant.
Based on the above technical solution, the present invention can also be improved as follows.
Further, several bands stretched to periphery are fixedly installed on the outer wall of the connecting rod one of the rotary-cut sampling head to fall
Pierce cross bar.
Further, bearing, the inner ring of the bearing and the rotary-cut are arranged in the connecting rod one of the rotary-cut sampling head
One outer wall of connecting rod of sampling head is fixedly connected, and several band hangnails stretched to periphery are fixedly installed on the outer ring of the bearing
Cross bar, the outer ring of the bearing and thereon with hangnail cross bar can around the central axis of the connecting rod one of the rotary-cut sampling head turn
It is dynamic.
Further, being blocked at the upper end opening of the hollow iron pipe has annular cock body, the center of the annular cock body
Equipped with the centre bore freed in and out for the screw, the aperture of the centre bore is more than the outer diameter of the screw, the spiral
The outer diameter of set is more than the aperture of the centre bore, and the annular cock body can prevent the screw-casing by the screw from the sky
It is pulled out at the upper end opening of heart iron pipe.
Further, the lower end of the hollow iron pipe is provided with internal thread, the connecting rod one of the rotary-cut sampling head it is upper
End is provided with the external screw thread one to match with the internal thread, and the rotary-cut sampling head and the hollow iron pipe are detachably connected.
Further, crawl sampling head, rim brake and steel wire are further included, by the rotary-cut sampling head under the hollow iron pipe
After end disassembles, the lower end of the hollow iron pipe can be connect with the threaded upper ends of the connecting rod two of the crawl sampling head, institute
The lower end for stating the connecting rod two of crawl sampling head is connect with two by the hinged calvus in tail portion, and the rim brake is arranged on
It is connect on the outer wall of the hollow iron pipe and with one end of the steel wire, the other end of the steel wire and the crawl sampling head
Transmission parts connect, and pressing the rim brake can drive the head of described two calvus to lean on mutually by the steel wire and transmission parts
Nearly crawl submerged plant.Wherein, the connection structure of the rim brake and steel wire can the class hand on hundle-bar than in the prior art
Brake structure.
Further, the tail portion of described two calvus is hinged by axis pin, is arranged on the axis pin described two for making
The head of calvus is mutually from so that the crawl sampling head is in the torsional spring of open configuration.Capture sampling head due to the effect of torsional spring at
It in open configuration, does not need to that time and efforts is spent to open sampling head again when using every time, need to only be goed deep into close in water adopt
Sampling point, then pressing rim brake is closed two calvus of crawl sampling head, then can capture submerged plant, completes sampling, sampling effect
Rate significantly improves.
Further, the transmission parts include steel wire rope, lantern ring and hook, and the connecting rod two of the crawl sampling head is
It is empty and its lower end is vertical with the middle part of the axis pin is fixedly connected, one end of the steel wire rope and one of them calvus
Head is fixedly connected, the head of another calvus is fixedly connected with lantern ring, and the other end of the steel wire rope is from the lantern ring
Annular distance in pass through and through it is described crawl sampling head connecting rod two inside be pierced by after with it is described hook be fixedly connected, it is described to grab
After sampling head is taken to be connect with the hollow iron pipe, the hook is located in the hollow iron pipe and is connect with the steel wire.
Further, gear piece that can be engaged when the head of described two calvus is provided with seized condition, on the calvus
Several filtration holes are provided with, bucket type net is enclosed on the outer wall of the calvus, the lower end of the hollow iron pipe is provided with interior spiral shell
Line, the upper end of the connecting rod two of the crawl sampling head are provided with the external screw thread two to match with the internal thread, the crawl
Sampling head is detachably connected with the hollow iron pipe.The structure of each calvus is：By several in the middle part of two parallel side plates
Cross bar connects, one piece of baffle for carrying gear piece of the equal vertical connection in head of two parallel side plates, the tail portion phase of two parallel side plates
To offering the circular hole passed through for the axis pin.The outer side edges of baffle of the bucket type net with two side plates and with gear piece are connect,
The net cage or cylinder mould for containing submerged plant is collectively formed in bucket type net and calvus during seized condition.
The present invention also provides a kind of submerged plant acquisition method, this method uses submerged plant harvester as described above
Submerged plant is acquired.
Compared with prior art, submerged plant harvester and acquisition method provided by the invention have the following advantages that：
1) present invention is connected with rotary-cut sampling head in the lower thread of hollow iron pipe, and the top of hollow iron pipe is provided with screw
And screw-casing, outer wall setting bearing handle, the inner wall of hollow iron pipe are provided with the snap ring that can be engaged with the screw-casing, work as screw
During pushing, screw-casing drives hollow iron pipe, rotary-cut sampling head to rotate together, the blade circumgyration incision on rotary-cut sampling head it is longer compared with
Large-scale submerged plant, is hollow iron pipe because using, therefore from heavy and light, it is easy to operate；Simultaneously bearing handle and screw upper end
The mating setting of handle, hollow iron pipe and screw are held respectively by hand, can one man operation's harvester precisely sampled, sky
Heart iron pipe will not unstability and deviate sampled point；
2) setting band hangnail cross bar on the outer wall of the connecting rod one of rotary-cut sampling head can make longer to be sunk by what blade cut off
Water plant is hung on band hangnail cross bar, and then is smoothly taken out from water；The outer wall of the connecting rod one of rotary-cut sampling head is first arranged
Bearing, then with hangnail cross bar, setting, which can not only reach, in this way hangs over down submerged plant for fixed setting on the outer ring of bearing
The purpose of the water surface is taken out of on thorn cross bar, can also effectively reduce the resistance being subject to during the rotation of rotary-cut sampling head, and when sampling more saves
Power；
3) harvester of the invention further includes crawl sampling head, and is provided with described in corresponding control on hollow iron pipe
The rim brake and steel wire of sampling head are captured, when needing to be acquired small-sized water plant, it is only necessary to unload rotary-cut sampling head, so
The upper end that crawl sampling head is connected through to bar two afterwards is connect with the hollow iron pipe, then passes through rim brake and steel wire manipulates institute
It states crawl sampling head to sample small-sized water plant, i.e., the submerged plant harvester that the present invention designs can be to difference
Submerged plant is acquired and device is gentlier convenient for carrying, installs and easy to operate, including a thief rod (hollow iron pipe) and
Two kinds of sampling heads (rotary-cut sampling head and crawl sampling head), the smaller submerged plant of plant is adopted using crawl sampling head
Collection, and larger submerged plant is acquired using rotary-cut sampling head, applicability is wider, and because the sampling with hard
Bar, therefore operability is stronger, sampling is more effortless, more accurate.
Description of the drawings
Fig. 1 is a kind of structure diagram of submerged plant harvester provided by the invention；
Fig. 2 is the diagrammatic cross-section of submerged plant harvester upper end opening position shown in Fig. 1；
Fig. 3 is the structure diagram of rotary-cut sampling head；
Fig. 4 is the structure diagram for capturing sampling head；
Fig. 5 is the dimensional structure diagram for capturing sampling head；
Fig. 6 is the connection diagram between the axis pin, torsional spring and connecting rod two for capturing sampling head.
In attached drawing, parts list represented by the reference numerals are as follows：
1. screw；2. rim brake；3. steel wire；4. internal thread；5. bearing handle；6. handle；7. hollow iron pipe；8. ring plug
Body；9. screw-casing；10. snap ring；11. band hangnail cross bar；12. blade；13. hook；14. bucket type net；15. gear piece；16. external screw thread
One；17. bearing；18. connecting rod one；19. connecting rod two；20. external screw thread two；21. calvus；22. axis pin；23. torsional spring；24. steel
Cord；25. lantern ring；26. filtration hole.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Figures 1 to 6, the present invention provides a kind of submerged plant harvester, including hollow iron pipe 7, screw 1 and rotation
Sampling head is cut, the lower end of the hollow iron pipe 7 can be connect with the threaded upper ends of the connecting rod 1 of the rotary-cut sampling head, described
The lower end of the connecting rod 1 of rotary-cut sampling head is fixedly installed blade 12, is arranged on the outer wall on hollow 7 top of iron pipe
Bearing handle 5 is fixedly installed snap ring 10, the central through hole of the snap ring 10 in the inner wall circumferential direction on hollow 7 top of iron pipe
Diameter is more than the outer diameter of the screw 1, and the lower part of the screw 1 is from the upper end opening of the hollow iron pipe 7 along the cored iron
The central axis of pipe 7 inserts into the inner, and the top of the screw 1 is located at outside the hollow iron pipe 7 and the upper end of the screw 1 is consolidated
Surely handle 6 is provided with, matched screw-casing 9 is arranged on the screw 1, the screw-casing 9 is located at the hollow iron pipe 7
The latch that can be engaged with the snap ring 10 is provided on interior and its lower face, the screw 1, the screw 1 are pushed by handle 6
The screw-casing 9 can be driven to move down and it is made to be engaged with the snap ring 10, continue to push the screw 1, the screw 1 can make institute
It states screw-casing 9 and snap ring 10 drives the hollow iron pipe 7 and rotary-cut sampling head using the central axis of the hollow iron pipe 7 as rotation
Axis rotates, and the blade 12 rotates with cutting submerged plant.
Based on the above technical solution, the present invention can also be improved as follows.
Further, several bands stretched to periphery are fixedly installed on the outer wall of the connecting rod 1 of the rotary-cut sampling head
Hangnail cross bar 11.
Further, bearing 17, the inner ring of the bearing 17 and institute are arranged in the connecting rod 1 of the rotary-cut sampling head
One 18 outer wall of connecting rod for stating rotary-cut sampling head is fixedly connected, and is fixedly installed and several is stretched to periphery on the outer ring of the bearing 17
The band hangnail cross bar 11 of exhibition, the outer ring of the bearing 17 and thereon can be around the connection of the rotary-cut sampling head with hangnail cross bar 11
The center axis thereof of bar 1.
Further, being blocked at the upper end opening of the hollow iron pipe 7 has annular cock body 8, the centre bit of the annular cock body 8
It has installed and has freed in and out centre bore for the screw 1, the aperture of the centre bore is more than the outer diameter of the screw 1, the spiral shell
The outer diameter of rotation set 9 be more than the centre bore aperture, it is described annular cock body 8 can prevent the screw-casing 9 by the screw 1 from
It is pulled out at the upper end opening of the hollow iron pipe 7.
Further, the lower end of the hollow iron pipe 7 is provided with internal thread 4, the connecting rod 1 of the rotary-cut sampling head
Upper end be provided with the external screw thread 1 to match with the internal thread, the rotary-cut sampling head and the hollow iron pipe 7 are removable
Unload connection.
Further, crawl sampling head, rim brake 2 and steel wire 3 are further included, by the rotary-cut sampling head from the hollow iron pipe 7
Lower end disassemble after, the lower end of the hollow iron pipe 7 can be with the threaded upper ends of the connecting rod 2 19 of the crawl sampling head
Connection, the lower end of the connecting rod 2 19 of the crawl sampling head are connect with two by the hinged calvus 21 in tail portion, institute
Rim brake 2 is stated to be arranged on the outer wall of the hollow iron pipe 7 and connect with one end of the steel wire 3, the other end of the steel wire 3 with
The transmission parts connection of the crawl sampling head, described two can be driven by the steel wire 3 and transmission parts by pressing the rim brake 2
The head crawl submerged plant adjacent to each other of a calvus 21.
Further, the tail portion of described two calvus 21 is hinged by axis pin 22, is arranged on the axis pin 22 for making
The head of two calvus 21 is stated mutually from so that the crawl sampling head is in the torsional spring 23 of open configuration.
Further, the transmission parts include steel wire rope 24, lantern ring 25 and hook 13, the connecting rod of the crawl sampling head
2 19, which be that hollow and its lower end is vertical with the middle part of the axis pin 22, is fixedly connected, one end of the steel wire rope 24 and wherein one
The head of a calvus 21 is fixedly connected, and the head of another calvus 21 is fixedly connected with lantern ring 25, the steel wire rope
After 24 other end is passed through out of the lantern ring 25 annular distance and is pierced by through the inside of the connecting rod 2 19 of the crawl sampling head
It is fixedly connected with the hook 13, after the crawl sampling head is connect with the hollow iron pipe 7, the hook 13 is located at the sky
It is connect in heart iron pipe 7 and with the steel wire 3.
Further, gear piece 15 that can be engaged when the head of described two calvus 21 is provided with seized condition, the pawl
Several filtration holes 26 are provided on piece 21, bucket type net 14, the lower end setting of the hollow iron pipe 7 are connected on the calvus 21
There is internal thread 4, the upper end of the connecting rod 2 19 of the crawl sampling head is provided with the external screw thread two to match with the internal thread
20, the crawl sampling head is detachably connected with the hollow iron pipe 7.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of submerged plant harvester, which is characterized in that including hollow iron pipe (7), screw (1) and rotary-cut sampling head, institute
Stating the lower end of hollow iron pipe (7) can connect with the threaded upper ends of the connecting rod one (18) of the rotary-cut sampling head, and the rotary-cut is adopted
The lower end of the connecting rod one (18) of sample head is fixedly installed blade (12), is arranged on the outer wall on hollow iron pipe (7) top
Bearing handle (5) is fixedly installed snap ring (10) in the inner wall circumferential direction on hollow iron pipe (7) top, the snap ring (10)
Central through hole diameter is more than the outer diameter of the screw (1), and the lower part of the screw (1) is opened from the upper end of the hollow iron pipe (7)
The central axis of hollow iron pipe (7) inserts into the inner described in opening's edge, and the top of the screw (1) is located at the hollow iron pipe (7) outside
And the upper end of the screw (1) is fixedly installed handle (6), and matched screw-casing is arranged on the screw (1)
(9), the screw-casing (9) is provided with and can be engaged with the snap ring (10) in the hollow iron pipe (7) and on its lower face
Latch, the screw (1) is pushed by handle (6), the screw (1) screw-casing (9) can be driven to move down and make its with
Snap ring (10) engagement, continues to push the screw (1), the screw (1) can make the screw-casing (9) and snap ring (10) band
It moves the hollow iron pipe (7) and rotary-cut sampling head to rotate by rotary shaft of the central axis of the hollow iron pipe (7), the blade
(12) cutting submerged plant is rotated with, bearing (17), the axis are arranged in the connecting rod one (18) of the rotary-cut sampling head
The inner ring for holding (17) is fixedly connected with connecting rod one (18) outer wall of the rotary-cut sampling head, solid on the outer ring of the bearing (17)
Surely several band hangnail cross bars (11) stretched to periphery are provided with, the outer ring of the bearing (17) and band hangnail cross bar thereon
It (11) can be around the center axis thereof of the connecting rod one (18) of the rotary-cut sampling head.
2. a kind of submerged plant harvester according to claim 1, which is characterized in that the hollow iron pipe (7) it is upper
Being blocked at end opening has an annular cock body (8), the center of the annular cock body (8) be equipped with for the screw (1) freely into
The centre bore gone out, the aperture of the centre bore are more than the outer diameter of the screw (1), and the outer diameter of the screw-casing (9) is more than described
The aperture of centre bore.
3. a kind of submerged plant harvester according to claim 1, which is characterized in that under the hollow iron pipe (7)
End is provided with internal thread (4), and the upper end of the connecting rod one (18) of the rotary-cut sampling head is provided with to match with the internal thread
External screw thread one (16), the rotary-cut sampling head and the hollow iron pipe (7) are detachably connected.
4. a kind of submerged plant harvester according to claim 1, which is characterized in that further include crawl sampling head, hand
Lock (2) and steel wire (3), after the rotary-cut sampling head is disassembled from the lower end of the hollow iron pipe (7), the hollow iron pipe
(7) lower end can be connect with the threaded upper ends of the connecting rod two (19) of the crawl sampling head, the connection of the crawl sampling head
The lower end of bar two (19) is connect with two by the hinged calvus in tail portion (21), and the rim brake (2) is arranged on the sky
It is connect on the outer wall of heart iron pipe (7) and with one end of the steel wire (3), the other end of the steel wire (3) is sampled with the crawl
The transmission parts connection of head, described two calvus can be driven by the steel wire (3) and transmission parts by pressing the rim brake (2)
(21) head crawl submerged plant adjacent to each other.
A kind of 5. submerged plant harvester according to claim 4, which is characterized in that the tail of described two calvus (21)
Portion is hinged by axis pin (22), and the head for making described two calvus (21) is arranged on the axis pin (22) mutually from so that institute
State the torsional spring (23) that crawl sampling head is in open configuration.
6. a kind of submerged plant harvester according to claim 5, which is characterized in that the transmission parts include steel wire
Restrict (24), lantern ring (25) and hook (13), it is described crawl sampling head connecting rod two (19) for hollow and its lower end with it is described
The middle part of axis pin (22) is vertically fixedly connected, and one end and the head of calvus one of them described (21) of the steel wire rope (24) are consolidated
Fixed connection, the head of another calvus (21) are fixedly connected with lantern ring (25), and the other end of the steel wire rope (24) is from institute
State passed through in the annular distance of lantern ring (25) and through it is described crawl sampling head connecting rod two (19) inside be pierced by after and the hook
(13) it is fixedly connected, after the crawl sampling head is connect with the hollow iron pipe (7), the hook (13) is positioned at the cored iron
It is connect in pipe (7) and with the steel wire (3).
A kind of 7. submerged plant harvester according to claim 6, which is characterized in that the head of described two calvus (21)
Portion can be engaged when being provided with seized condition gear piece (15), be provided with several filtration holes (26), institute on the calvus (21)
It states and bucket type net (14) is enclosed on the outer wall of calvus (21), the lower end of the hollow iron pipe (7) is provided with internal thread (4), described
The upper end for capturing the connecting rod two (19) of sampling head is provided with the external screw thread two (20) to match with the internal thread, the crawl
Sampling head is detachably connected with the hollow iron pipe (7).
8. a kind of submerged plant acquisition method, which is characterized in that adopted using claim 1 to 7 any one of them submerged plant
Acquisition means are acquired submerged plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192072.XA CN105738150B (en) | 2016-03-30 | 2016-03-30 | A kind of submerged plant harvester and submerged plant acquisition method |
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| CN201610192072.XA CN105738150B (en) | 2016-03-30 | 2016-03-30 | A kind of submerged plant harvester and submerged plant acquisition method |
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| CN105738150A CN105738150A (en) | 2016-07-06 |
| CN105738150B true CN105738150B (en) | 2018-06-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111044314B (en) * | 2019-12-19 | 2021-03-02 | 中国科学院南京地理与湖泊研究所 | Hand-held type benthophyte ration collection system |
| CN113281089B (en) * | 2021-05-07 | 2024-02-09 | 水利部中国科学院水工程生态研究所 | Quantitative collection device of floating plant |
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| CN205426552U (en) * | 2016-03-30 | 2016-08-03 | 湖北大学 | Benthophyte collection system |
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|---|---|---|---|---|
| CN201325024Y (en) * | 2008-06-03 | 2009-10-14 | 唐朝勤 | Pressure-type drill hole or rotary screw device |
| CN201225963Y (en) * | 2008-06-20 | 2009-04-22 | 中国科学院南京地理与湖泊研究所 | Hydrophyte quantitative sampler with cutter head |
| CN203086992U (en) * | 2013-01-11 | 2013-07-31 | 山东省环境保护科学研究设计院 | Aquatic plant sampling device |
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| CN105738150A (en) | 2016-07-06 |
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