CN108317929A - A kind of measuring device and its application method of the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter - Google Patents
A kind of measuring device and its application method of the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter Download PDFInfo
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- CN108317929A CN108317929A CN201810449599.5A CN201810449599A CN108317929A CN 108317929 A CN108317929 A CN 108317929A CN 201810449599 A CN201810449599 A CN 201810449599A CN 108317929 A CN108317929 A CN 108317929A
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- gage
- tightrope
- diameter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0035—Measuring of dimensions of trees
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/08—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Botany (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention discloses a kind of measuring devices and its application method for the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter, it includes pedestal, the pedestal is the circular cylindrical tubular structure of bottom end closure, horizontal spool is fixedly connected on the inner wall of pedestal, several scalable hollow connecting rods are connected with above pedestal, the connecting rod of the top has been connected through a screw thread measuring device, the measuring device is equipped with moveable gage, it has been respectively fixedly connected with gage folder A and tightrope fixed column on one end two sides of gage, tightrope is connected between the tightrope fixed column and spool.The diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter size for learning plant can be directly measured using the device, it can also meet the diameter measurement to each position limb of plant by the installation of supporting rod different directions, the present invention has the characteristics that at low cost, simple in structure, easy-to-use, achieves significant practical function.
Description
Technical field
The present invention relates to the measuring devices more particularly to a kind of karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground of a plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter
With the measuring device and its application method of base diameter, belong to botany studying technological domain.
Background technology
Revegetation is one of main mode of karst Prevention ＆ Control of Rocky Desertification, for the long term monitoring of vegetation state
It is the important means for examining working effect.The diameter of a cross-section of a tree trunk 1.3 meters above the ground of xylophyta, base diameter are the important indicators for weighing standing volume, for vegetation
The monitoring of recovery situation and Sustainable Operation have important indicative significance.The traditional measurement plant diameter of a cross-section of a tree trunk 1.3 meters above the ground, base diameter generally use volume
Ruler first measures the high position of tree of 1.3m, and pi conversion is carried out after measuring trunk perimeter, and measurement process is complicated, even needs sometimes
Two people's cooperations are wanted to complete, and resultant error is larger；Secondly this kind of tool is for measuring karst some growth in cliff
Petrophyte difficulty is larger, if implementation strategy may threaten the life security of field man reluctantly.In addition, for steady
Solid platform as support requirement in the extremely difficult completion in karst.Therefore, a kind of safe, side is provided in karst
Just, efficiently xylophyta base diameter, tree breast diameter survey tool are for the revegetation achievement during monitoring Prevention ＆ Control of Rocky Desertification
Very it is necessary to.
Invention content
The technical problem to be solved by the present invention is to：A kind of measurement dress for the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter is provided
It sets and its application method, the diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter size for learning plant can be directly measured using the device, it is different to pass through supporting rod
The installation in direction can also meet the diameter measurement to each position limb of plant, solve above-mentioned technical problem.
The technical scheme is that：A kind of measuring device of the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter, it includes pedestal,
The pedestal is the circular cylindrical tubular structure of bottom end closure, is fixedly connected with horizontal spool on the inner wall of pedestal, pedestal it is upper
Side is connected with several scalable hollow connecting rods, and the connecting rod of the top has been connected through a screw thread measuring device, the measurement
Device is equipped with moveable gage, and gage folder A and tightrope fixed column have been respectively fixedly connected on one end two sides of gage,
It is connected with tightrope between the tightrope fixed column and spool.
The measuring device includes measuring seat and gage folder B, and the measurement seat is a square cavity structure, is measuring seat
Bottom and side are respectively equipped with identical threaded hole one and threaded hole two, and measuring device is by threaded hole one and threaded hole two and most
The connecting rod of upper end connects, and is equipped with symmetrical two gage holes in the upper side for measuring seat, gage has gage in hole, in gage hole
Lower section be equipped with a tightrope hole one, have tightrope in tightrope hole one, gage be fixedly connected in the outer side edges for measuring seat and presss from both sides B.
Handle is fixedly connected on one end of the spool, handle is located at the outside of pedestal.
The top of the spool is equipped with rope support, and the rope support is fixedly connected on the madial wall of pedestal, in the centre of rope support
Equipped with tightrope hole two, there is tightrope in tightrope hole two.
The side of the pedestal is equipped with measured hole, the position for measuring hole horizontal face tightrope and positioned at the upper of rope support
Side.
The side of the gage folder B is concordant with the side of seat is measured, and gage presss from both sides B and gage hole is concordant in level height,
Gage presss from both sides B and gage folder A is parallel and vertical with gage.
The application method of a kind of karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and the measuring device of base diameter, the method includes following steps
Suddenly：
One, the top of measuring device and connecting rod is connected through a screw thread, when needing to measure the diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter of plant, connecting rod connects
Be connected on threaded hole one, when need the position that measures farther out when, connecting rod is connected on threaded hole two；
Two, one end of gage is passed through to the two gage holes measured on seat；
Three, tightrope is fixedly connected across tightrope hole two, connecting rod and tightrope hole one with tightrope fixed column；
Four, telescopic connecting rod is stretched in suitable length or height；
Five, gage is pressed from both sides into A and gage folder B is placed on the plant diameter of a cross-section of a tree trunk 1.3 meters above the ground for needing to measure or base diameter, pass through operation handle rotational line
Axis tenses tightrope so that gage presss from both sides A and leans on close contact with plant and gage folder B；
Six, the diameter of a cross-section of a tree trunk 1.3 meters above the ground or base diameter of plant can be measured by the scale on gage, or the quarter on tightrope is read by measured hole
The diameter of a cross-section of a tree trunk 1.3 meters above the ground or base diameter of plant can be also calculated in degrees of data.
The beneficial effects of the invention are as follows：Compared with prior art, the present invention has the following advantages：First, structure of the invention
Simply, reliably, in a large amount of field measuremenies of karst Environmental Studies, the reliability of equipment often determines a field
The success or failure of investigation, the present invention have stronger reliability, it is ensured that measure being smoothed out for work；Secondly, present invention operation is simple,
Not complicated operating procedure, not complicated reduction formula obtain final measurement result, improve work efficiency；The
Three, the present invention can measure relatively reliable numerical value by the structure design of science, improve the accuracy of correlative study；Again,
Karst topography and geomorphology is complicated, and traditional measurement mode is more demanding for landform, on the complex or special ground of landform
Area even can bring security risk to the measurement of plant base diameter and the diameter of a cross-section of a tree trunk 1.3 meters above the ground, such as can be most in steeper hillside fields or precipice side, the present invention
Limits overcome problems, overcome orographic factor, ensure the personal safety of measuring study personnel；Finally, the present invention is convenient for
It carries, lighter in weight, convenient for being carried when field inspection, the burden of Portable device when mitigating field study improves work effect
Rate；In addition, the present invention can also meet the diameter measurement to each position limb of plant by the installation of supporting rod different directions.
Description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is vertical view of the present invention；
Fig. 3 is A partial enlarged views of the present invention；
Fig. 4 is B partial enlarged views of the present invention.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below with reference to this specification attached drawing to this hair
It is bright to be described in further detail.
Embodiment 1：As shown in attached drawing 1~4, a kind of measuring device of the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter, it includes
Pedestal 17, the pedestal 17 are the circular cylindrical tubular structure of bottom end closure, and horizontal line is fixedly connected on the inner wall of pedestal 17
The top of axis 9, pedestal 17 is connected with the scalable hollow connecting rod 3 of four sections, and the connecting rod 3 of the top is connected with by screw thread 5
Measuring device 4, the measuring device 4 are equipped with moveable gage 6, are respectively fixedly connected on one end two sides of gage 6
There are gage folder A10 and tightrope fixed column 13, tightrope 2 is connected between the tightrope fixed column 13 and spool 9.
Further, measuring device 4 includes measuring seat 11 and gage folder B12, and the measurement seat 11 is a square cavity knot
Structure is respectively equipped with identical threaded hole 1 and threaded hole 2 20 in the bottom and side for measuring seat 11, and measuring device 4 passes through spiral shell
Pit 1 and threaded hole 2 20 are connect with the connecting rod 3 of the top, and symmetrical two amounts are equipped in the upper side for measuring seat 11
There is gage 6 in ruler hole 14 in gage hole 14, is equipped with a tightrope hole 1 in the lower section in gage hole 14, has tightrope in tightrope hole 1
2, it is fixedly connected with gage in the outer side edges for measuring seat 11 and presss from both sides B12.
Further, handle 8 is fixedly connected on one end of spool 9, handle is located at the outside of pedestal 17.
Further, the top of spool 9 is equipped with rope support 1, and the rope support 1 is fixedly connected on the madial wall of pedestal 17,
The centre of rope support 1 is equipped with tightrope hole 2 16, has tightrope 2 in tightrope hole 2 16.
Further, the side of pedestal 17 is equipped with measured hole 7, the position and position of 7 horizontal face tightrope 2 of the measured hole
In the top of rope support 1.
Further, the side of gage folder B12 is concordant with the side of seat 11 is measured, and gage presss from both sides B12 with gage hole 14 in water
Concordant in flat height, gage presss from both sides B12 and gage folder A10 is parallel and vertical with gage 6.
The application method of a kind of karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and the measuring device of base diameter, the method includes following steps
Suddenly：
One, measuring device 4 is connect with the top of connecting rod 3 by screw thread 5, when needing to measure the diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter of plant, even
Bar 3 is connected on threaded hole 1, when need the position that measures farther out when, connecting rod 3 is connected on threaded hole 2 20；
Two, one end of gage 6 is passed through to the two gage holes 14 measured on seat 11；
Three, tightrope 2 is fixedly connected across tightrope hole 2 16, connecting rod 3 and tightrope hole 1 with tightrope fixed column 13；
Four, telescopic connecting rod 3 is stretched in 1.3 meters of height, you can the diameter of a cross-section of a tree trunk 1.3 meters above the ground for measuring plant, when compression connecting rod is to most short
Length on, be positioned on ground, you can measure the base diameter of plant；
Five, gage is pressed from both sides into A10 and gage folder B12 is placed on the plant diameter of a cross-section of a tree trunk 1.3 meters above the ground for needing to measure or base diameter, revolved by operation handle 8
Spool 9 tenses tightrope 2 so that gage presss from both sides A10 and leans on close contact with plant and gage folder B12；
Six, the diameter of a cross-section of a tree trunk 1.3 meters above the ground or base diameter of plant can be measured by the scale on gage 6, or are read on tightrope 2 by measured hole 7
The diameter of a cross-section of a tree trunk 1.3 meters above the ground or base diameter of plant can be also calculated in calibration data.
Embodiment 2：When measuring the plant diameter of a cross-section of a tree trunk 1.3 meters above the ground using the present apparatus, pulls out tightrope 2 and its head end is lain in into tightrope fixed column
On 13, connecting rod 3 is fixed to by screw thread 5 and threaded hole 1 and is measured on seat 11, connecting rod 3 and gage 6 are in an angle of 90 degrees at this time, will
Telescopic connecting rod 3 is elongated to 1.3 meters, and the tail end pedestal 17 of connecting rod 3 is placed in ground, and the height of gage 6 is 1.3 meters, is pulled open
Gage folder A10 makes the measured part of plant by gage folder A10 and gage folder B12 clampings, and observable obtains the plant on gage 6 at this time
Strain diameter of a cross-section of a tree trunk 1.3 meters above the ground data.
Embodiment 3：When measuring plant base diameter using the present apparatus, pulls out tightrope 2 and its head end is lain in into tightrope fixed column
On 13, connecting rod 3 is fixed to by screw thread 5 and threaded hole 1 and is measured on seat 11, connecting rod 3 and gage 6 are in an angle of 90 degrees at this time, will
The tail end pedestal 17 of connecting rod 3 is placed in ground, and gage 6 is highly 20 centimetres, and pulling open gage folder A10 makes plant be measured part quilt
Gage presss from both sides A10 and gage folder B12 and clamps, and observable obtains the plant base diameter data on gage 6 at this time.
Embodiment 4：When being located at the plant diameter of a cross-section of a tree trunk 1.3 meters above the ground near steep cliff using present apparatus measurement growth position, tightrope 2 is pulled out simultaneously
Its head end is lain in tightrope fixed column 13, connecting rod 3 is fixed to by screw thread 5 and threaded hole 2 20 and is measured on seat 11, at this time
Connecting rod 3 is in parastate with gage 6, and holding meanss are vertical with plant cadre, pulls open gage folder A10, plant is made to be measured part
It is pressed from both sides between A10 and gage folder B12 by gage, at this time rotational handle 8, so that plant is clamped by gage folder A10 and gage folder B12, lead to
The measured hole 7 on 17 side of observation pedestal is crossed, the data that can be read on tightrope 2 at this time are X, and connecting rod is kept after removing measuring device
3 length is constant, and swinging handle 8 allows gage folder A10 to withdraw, and can read the data on tightrope 2 at this time by measured hole 7 at this time is
Y, data X-Y are measured plant diameter of a cross-section of a tree trunk 1.3 meters above the ground size, and base diameter measurement method is same, straight when needing to measure plant forked section
Make device vertical with bifurcated holding when diameter, application method is identical.
Place is not described in detail by the present invention, is the known technology of those skilled in the art of the present technique.Finally illustrate, the above reality
Apply that example is merely illustrative of the technical solution of the present invention and unrestricted, although having been carried out specifically to the present invention with reference to preferred embodiment
It is bright, it will be understood by those of ordinary skill in the art that, technical scheme of the present invention can be modified or replaced equivalently, and
The objective and range for not departing from technical solution of the present invention, are intended to be within the scope of the claims of the invention.
Claims (7)
1. a kind of measuring device of the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter, it includes pedestal（17）, it is characterised in that：The bottom
Seat（17）For the circular cylindrical tubular structure of bottom end closure, pedestal（17）Inner wall on be fixedly connected with horizontal spool（9）, pedestal
（17）Top be connected with several scalable hollow connecting rods（3）, the connecting rod of the top（3）Pass through screw thread（5）It is connected with
Measuring device（4）, the measuring device（4）It is equipped with moveable gage（6）, in gage（6）One end two sides on respectively
It is fixedly connected with gage folder A（10）With tightrope fixed column（13）, the tightrope fixed column（13）With spool（9）Between be connected with it is soft
Rope（2）.
2. the measuring device and its application method of a kind of karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter according to claim 1,
It is characterized in that：The measuring device（4）Including measuring seat（11）B is pressed from both sides with gage（12）, the measurement seat（11）It is rectangular for one
Cavity structure is measuring seat（11）Bottom and side be respectively equipped with identical threaded hole one（19）With threaded hole two（20）, survey
Measure device（4）Pass through threaded hole one（19）With threaded hole two（20）With the connecting rod of the top（3）Connection is measuring seat（11）It is upper
Portion side is equipped with symmetrical two gage holes（14）, gage hole（14）Inside there is gage（6）, in gage hole（14）Lower section be equipped with one
Tightrope hole one（18）, tightrope hole one（18）Inside there is tightrope（2）, measuring seat（11）Outer side edges on be fixedly connected with gage folder B
（12）.
3. the measuring device of a kind of the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter according to claim 1, it is characterised in that：Institute
State spool（9）One end on be fixedly connected with handle（8）, handle is located at pedestal（17）Outside.
4. the measuring device of a kind of the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter according to claim 1, it is characterised in that：Institute
State spool（9）Top be equipped with rope support（1）, the rope support（1）It is fixedly connected on pedestal（17）Madial wall on, in rope support（1）
Centre be equipped with tightrope hole two（16）, tightrope hole two（16）Inside there is tightrope（2）.
5. the measuring device of a kind of the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter according to claim 1, it is characterised in that：Institute
State pedestal（17）Side be equipped with measured hole（7）, the measured hole（7）Horizontal face tightrope（2）Position and be located at rope support
（1）Top.
6. the measuring device of a kind of the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter according to claim 2, it is characterised in that：Institute
State gage folder B（12）Side with measure seat（11）Side it is concordant, gage press from both sides B（12）With gage hole（14）In level height
Concordantly, gage presss from both sides B（12）A is pressed from both sides with gage（10）Parallel and and gage（6）Vertically.
7. according to making for a kind of karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground of claim 1~6 any one of them and the measuring device of base diameter
With method, it is characterised in that：It the described method comprises the following steps：
One, by measuring device（4）With connecting rod（3）Top pass through screw thread（5）Connection, when the diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter for needing measurement plant
When, connecting rod（3）It is connected to threaded hole one（19）On, when need the position that measures farther out when, connecting rod（3）It is connected to threaded hole two
（20）On；
Two, by gage（6）One end pass through measure seat（11）On two gage holes（14）；
Three, by tightrope（2）Across tightrope hole two（16）, connecting rod（3）With tightrope hole one（18）With tightrope fixed column（13）It is fixed to connect
It connects；
Four, by telescopic connecting rod（3）It is stretched in suitable length or height；
Five, gage is pressed from both sides into A（10）B is pressed from both sides with gage（12）It is placed on the plant diameter of a cross-section of a tree trunk 1.3 meters above the ground for needing to measure or base diameter, passes through manipulator
Handle（8）Rotating bobbin（9）, by tightrope（2）It tenses so that gage presss from both sides A（10）B is pressed from both sides with plant and gage（12）By close contact；
Six, pass through gage（6）On scale can measure the diameter of a cross-section of a tree trunk 1.3 meters above the ground or base diameter of plant, or pass through measured hole（7）Read tightrope
（2）On calibration data, the diameter of a cross-section of a tree trunk 1.3 meters above the ground or base diameter of plant can also be calculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810449599.5A CN108317929A (en) | 2018-05-11 | 2018-05-11 | A kind of measuring device and its application method of the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810449599.5A CN108317929A (en) | 2018-05-11 | 2018-05-11 | A kind of measuring device and its application method of the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108317929A true CN108317929A (en) | 2018-07-24 |
Family
ID=62896633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810449599.5A Pending CN108317929A (en) | 2018-05-11 | 2018-05-11 | A kind of measuring device and its application method of the karst plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108317929A (en) |
Citations (9)
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|---|---|---|---|---|
| ATA68596A (en) * | 1996-04-16 | 1997-08-15 | Bitterlich Walter Dipl Ing Dr | VISOR MEASUREMENT ANGLE FOR DIAMETER DETERMINATION ON STANDING TREE TRUNKS |
| CN201141754Y (en) * | 2007-11-24 | 2008-10-29 | 李付军 | Vernier caliper type angle gauge dendrometer |
| JP2010243383A (en) * | 2009-04-08 | 2010-10-28 | Chugoku Electric Power Co Inc:The | Tree diameter measuring instrument |
| CN203364719U (en) * | 2013-06-26 | 2013-12-25 | 中国水产科学研究院南海水产研究所 | Portable tool for measuring breast-height diameter and ground diameter of mangrove plant |
| CN205426043U (en) * | 2016-02-05 | 2016-08-03 | 刘文桢 | One -man operation's forest diameter of a cross -section of a tree trunk 1. 3 meters above ground caliber |
| CN205808315U (en) * | 2016-06-20 | 2016-12-14 | 南京梅山冶金发展有限公司 | Hydrocyclone sand outspoken footpath on-line measurement device |
| KR20170046312A (en) * | 2015-10-21 | 2017-05-02 | 김동조 | Automatic measuring device for measuring the diameter of trees based on USN |
| CN206330501U (en) * | 2016-12-20 | 2017-07-14 | 淮阴师范学院 | A kind of portable plant tree breast diameter survey chi |
| CN208125031U (en) * | 2018-05-11 | 2018-11-20 | 贵州师范大学 | A kind of measuring device of the Karst region plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter |
-
2018
- 2018-05-11 CN CN201810449599.5A patent/CN108317929A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATA68596A (en) * | 1996-04-16 | 1997-08-15 | Bitterlich Walter Dipl Ing Dr | VISOR MEASUREMENT ANGLE FOR DIAMETER DETERMINATION ON STANDING TREE TRUNKS |
| CN201141754Y (en) * | 2007-11-24 | 2008-10-29 | 李付军 | Vernier caliper type angle gauge dendrometer |
| JP2010243383A (en) * | 2009-04-08 | 2010-10-28 | Chugoku Electric Power Co Inc:The | Tree diameter measuring instrument |
| CN203364719U (en) * | 2013-06-26 | 2013-12-25 | 中国水产科学研究院南海水产研究所 | Portable tool for measuring breast-height diameter and ground diameter of mangrove plant |
| KR20170046312A (en) * | 2015-10-21 | 2017-05-02 | 김동조 | Automatic measuring device for measuring the diameter of trees based on USN |
| CN205426043U (en) * | 2016-02-05 | 2016-08-03 | 刘文桢 | One -man operation's forest diameter of a cross -section of a tree trunk 1. 3 meters above ground caliber |
| CN205808315U (en) * | 2016-06-20 | 2016-12-14 | 南京梅山冶金发展有限公司 | Hydrocyclone sand outspoken footpath on-line measurement device |
| CN206330501U (en) * | 2016-12-20 | 2017-07-14 | 淮阴师范学院 | A kind of portable plant tree breast diameter survey chi |
| CN208125031U (en) * | 2018-05-11 | 2018-11-20 | 贵州师范大学 | A kind of measuring device of the Karst region plant diameter of a cross-section of a tree trunk 1.3 meters above the ground and base diameter |
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