CN207816672U - A kind of inclination sand hollow cylinder sample preparation facilities - Google Patents
A kind of inclination sand hollow cylinder sample preparation facilities Download PDFInfo
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- CN207816672U CN207816672U CN201820071990.1U CN201820071990U CN207816672U CN 207816672 U CN207816672 U CN 207816672U CN 201820071990 U CN201820071990 U CN 201820071990U CN 207816672 U CN207816672 U CN 207816672U
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Abstract
The utility model belongs to soil test field, is related to a kind of inclination sand hollow cylinder sample preparation facilities, including sample sheds module and power plant module automatically at mould module, sample；The sample at mould module by be in " cylinder " it is interior at mould cylinder, it is interior at the concentrically nested setting of mould cylinder and in the outer at mould cylinder and for being constituted at mould cylinder and the outer bottom plate at mould cylinder in installing of " cylinder " with this, interior is in the cavity of " hollow cylinder " at formation between mould cylinder and the outer cylinder at mould；The sample sheds module and includes the feed end in " infundibulate " and be connected and be used for the discharging end of the blanking into cavity with feed end automatically, and axis overlaps setting with cavity axis；The power plant module, being used to provide power, which makes sample shed module automatically at mould module and sample, produces relative rotation, and shedding module automatically at mould module and/or sample with sample is connected；Realize the preparation that radially there is the sand hollow cylinder sample of angle to preparing depositional plane and sample.
Description
Technical field
The utility model belongs to soil test field, is related to a kind of inclination sand hollow cylinder sample preparation facilities.
Background technology
Hollow cylinder torsional shear instrument is one of current state-of-the-art shop test equipment, and hollow cylinder torsional shear instrument can be controlled independently
The size of three principal stresses of system and the angle rotated around the direction of intermediate principal stress, thus anisotropic experiment can be carried out and ground
Study carefully.But the preparation to hollow cylinder sample be the technology development bottleneck, prepare hollow cylinder sample difficulty constrain it is hollow
The application of cylinder torsional shear instrument.
In the prior art, generally use layering sand replacement method prepares sand sample；Use draining concretion method and layer-compacting
Prepare remoulded clay sample.But traditional layering sand replacement method, when preparing sample, sample raw material are fallen naturally by gravity,
The sample depositional plane direction of preparation is horizontal, radial parallel with sample, is transverse isotropy sample；And layer-compacting is being made
It during standby sample, is exerted a force above sample using hammer, the sample depositional plane direction of preparation is also level, the diameter with sample
Equally it is transverse isotropy sample to parallel.
But stress vector includes three big a small amount of and three side vectors, and the change of stress intensity and stress direction can be led
Material is caused to show different mechanical properties.Consider from sample angle, existing hollow cylinder sample preparation method can only be prepared
The hollow cylinder sample of depositional plane level, therefore, the studied material of experiment must be tranversely isotropic material.From stress angle
Degree considers that during the test, intermediate principal stress direction is parallel with depositional plane always, and hollow cylinder torsional shear instrument can only be realized to three
The control of principal stress size and a principal stress direction angle.
Due to hollow cylinder torsional shear instrument can only proof stress rotate around the radial direction of sample, therefore, it is necessary to main in limiting
Stress direction radially and is parallel to depositional plane direction.Above-mentioned restriction causes hollow torsion shear test that can only consider a stress direction
Angle can only study the anisotropy of a dimension, can not simulate the stress of the soil body in nature completely, to a certain extent
Constrain the use of hollow cylinder torsional shear instrument.
Therefore, it is necessary to design a kind of dedicated equipment, it is used to prepare depositional plane and radially there is the sand of angle with sample
Hollow cylinder sample.Consider from stress angle, the stress state of sample is still controlled by hollow cylinder torsional shear instrument, intermediate principal stress
Still radially, it can still rotate around intermediate principal stress, to study the anisotropy of a dimension.It is examined from sample angle
Consider, pass through the control to depositional plane direction so that the depositional plane direction of sample no longer with it is radial parallel, but it is specific there are one
Angle, and then realize control to second dimension.Position relationship between sample depositional plane and stress vector is needed by two
A deflection is stated, and therefore, this kind of sample can be used for studying the three big a small amount of and both direction amount of stress to sample
Mechanical property influence.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of inclination sand hollow cylinder sample preparation facilities, use
Radially there is the sand hollow cylinder sample of angle with sample in preparing depositional plane.
In order to achieve the above objectives, the utility model provides the following technical solutions：
A kind of inclination sand hollow cylinder sample preparation facilities, is used to prepare sand hollow cylinder sample, including：Sample at
Mould module for the radial extruded sample that exerts a force, including is in the interior at mould cylinder and this is interior at the concentrically nested setting of mould cylinder of " cylinder "
And in " cylinder " it is outer at mould cylinder and in installing at mould cylinder and the outer bottom plate at mould cylinder, it is described it is interior at mould cylinder with outside
It is fixedly connected with the homonymy of bottom plate at mould cylinder, and interior at the cavity formed between mould cylinder and the outer cylinder at mould in " hollow cylinder "；
Sample sheds module automatically, for shedding sample raw material into cavity, is arranged on side of the cavity far from bottom plate, including be in
The feed end of " infundibulate " and the discharging end for being connected and being used for the blanking into cavity with feed end, axis and cavity axis weight
Close setting；Power plant module, being used to provide power, which makes sample shed module automatically at mould module and sample, produces relative rotation, with examination
Sample sheds module at mould module and/or sample and is connected automatically.
Optionally, the power plant module includes motor and the conveyer belt for transmission, the transmission band connection motor with
And bottom plate outer rim, after electric motor starting, conveyer belt drives bottom plate rotation, bottom plate drive in rotated synchronously at mould cylinder with outer at mould cylinder.
Optionally, the bottom plate is towards being additionally provided with drive bearing on the side of cavity.
Optionally, the power plant module includes the motor and conveyer belt of shaft and the rotation for driving shaft, described
The axle center that shaft sheds module with sample automatically overlaps and sheds module automatically with sample and is fixedly connected, the transmission band connection electricity
Machine and shaft, after electric motor starting, conveyer belt drives shaft rotation, shaft to drive sample to shed module automatically and rotated.
Optionally, further include hammer for hitting the real hollow cylinder sample, the hammer along closer or far from it is outer at
The direction of mould cylinder is arranged perpendicular to outer at the activity of mould cylinder axle center, taps outer at mould cylinder.
Optionally, the hammer is rubber hammer.
Optionally, further include in closing in mould cylinder at mould cylinder head cover, it is described interior at mould cylinder head cover and interior Cheng Mo
Cylinder is fixedly connected far from one end of bottom plate, the sample shed automatically module with it is described it is interior at mould cylinder head cover far from interior at mould cylinder
One end is fixedly connected.
Optionally, it is described it is interior at mould cylinder head cover be in the conical surface that tilts down, discharging end blanking far from the interior side at mould cylinder
Cavity is entered by the conical surface afterwards.
Optionally, further include for closing outside at the outer at mould cylinder head cover of mould cylinder, it is described outer at mould cylinder head cover and outer Cheng Mo
The one end of cylinder far from bottom plate is fixedly connected, and is in " hollow ring " shape, and internal diameter matches with the outer diameter at mould cylinder.
Optionally, it is described it is outer at mould cylinder far from the interior side at mould cylinder be equipped with several outer garter springs, the outer garter spring edge
The outer radial package at mould cylinder at mould cylinder and is fixed on outer at mould cylinder outside outside；The outer garter spring is along the outer short transverse at mould cylinder
Linearly it is provided with several.
The beneficial effects of the utility model are：
1, a kind of inclination sand hollow cylinder sample preparation facilities involved in the utility model, is set by mutually rotating
The sample set sheds module automatically at mould module and sample, realizes to the radial sand sample in a certain angle of depositional plane and sample
Preparation can prepare depositional plane and examination by the way that the adjustment to above-mentioned angle and control may be implemented to the adjusting of motor speed
Sample is in radially the sand sample of any angle.
2, a kind of inclination sand hollow cylinder sample preparation facilities involved in the utility model, passes through what is mutually rotated
Sample sheds the preparation that module carries out sample at mould module and sample automatically, is realized outside at the hammer outside mould cylinder by being arranged
Reality is hit to sample, hitting real process not influences the angle of inclination of sample depositional plane and sample radial direction, and it is higher can to prepare density
Sand sample.
3, a kind of inclination sand hollow cylinder sample preparation facilities involved in the utility model, is thrown automatically using sample
Spill module and carry out sample raw material and shed, the craft to substitute in traditional equipment is shed, by discharging end with it is interior at mould cylinder top
The cooperation of lid carries out automatic blanking, it is ensured that the uniformity that sample raw material fall, including shed height, shed speed and
Position is shed, ensures that the sample that equipment can be prepared is more uniformly distributed.
Other advantages, target and feature of the utility model will be explained in the following description to a certain extent
It states, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or
Person can be instructed from the practice of the utility model.The target of the utility model and other advantages can be said by following
Bright book is realized and is obtained.
Description of the drawings
In order to keep the purpose of this utility model, technical solution and advantage clearer, below in conjunction with attached drawing to this practicality
It is novel to be preferably described in detail, wherein：
Fig. 1 is a kind of cross-section structure signal of inclination sand hollow cylinder sample preparation facilities involved by the utility model
Figure；
Fig. 2 is the structural representation that sample involved in the utility model sheds module at mould module and sample automatically
Figure；
Fig. 3 is the structural schematic diagram of outer garter spring involved in the utility model；
Fig. 4 is the outer structural schematic diagram at mould cylinder head cover involved in the utility model；
Fig. 5 is the structural schematic diagram that bearing base and rotor involved in the utility model pass through transmission band connection；
Fig. 6 is floor structure schematic diagram involved in the utility model；
Fig. 7 is the force diagram of the sand grains involved in the utility model；
Sand grains of the Fig. 8 involved in the utility model are in the inclination sand hollow cylinder sample preparation facilities
The schematic shapes of falling state and depositional plane.
Specific implementation mode
Illustrate that the embodiment of the utility model, those skilled in the art can be by this theorys below by way of specific specific example
Content disclosed by bright book understands other advantages and effect of the utility model easily.The utility model can also be by addition
Different specific implementation modes are embodied or practiced, and the various details in this specification can also be based on different viewpoints and answer
With carrying out various modifications or alterations under the spirit without departing from the utility model.It should be noted that institute in following embodiment
The diagram of offer only illustrates the basic conception of the utility model in a schematic way, in the absence of conflict, following embodiment and
Feature in embodiment can be combined with each other.
- Fig. 8 is please referred to Fig.1, the element numbers in attached drawing indicate respectively：Sample at mould module 1, it is interior at mould cylinder 11, it is outer at
Mould cylinder 12, bottom plate 13, sample are shed module 2, feed end 21, discharging end 22, shaft 23, power plant module 3, motor 31, are turned automatically
It is son 311, conveyer belt 32, interior film forming cylinder head cover 4, outer at mould cylinder head cover 5, outer garter spring 6, nut 61, bearing base 7, drive bearing
71。
The utility model relates generally to a kind of inclination sand hollow cylinder sample preparation facilities, is used to prepare sand open circles
Column sample, including：Sample is at mould module 1, for the radial extruded sample that exerts a force, including be in " cylinder " it is interior at mould cylinder 11 and
This it is interior at the concentrically nested setting of mould cylinder 11 and in " cylinder " it is outer at mould cylinder 12 and for install it is interior at mould cylinder 11 and it is outer at
The bottom plate 13 of mould cylinder 12, it is described it is interior be fixedly connected with the homonymy of bottom plate 13 at mould cylinder 12 with outer at mould cylinder 11, and it is interior at mould cylinder 11
With outer at the cavity formed between mould cylinder 12 in " hollow cylinder "；Sample sheds module 2 automatically, for shedding examination into cavity
Sample raw material are arranged on side of the cavity far from bottom plate 13, including be in " infundibulate " feed end 21 and with feed end 21
It is connected and for the discharging end 22 of the blanking into cavity, axis overlaps setting with cavity axis；Power plant module 3, for providing
Power makes sample shed module 2 automatically at mould module 1 and sample to produce relative rotation, with sample at mould module 1 and/or sample from
Dynamic module 2 of shedding is connected.The relative rotation for shedding module 2 automatically at mould module 1 and sample by sample is realized to specific geotechnique
The preparation of sample, i.e. depositional plane and radial hollow cylinder sand sample in a certain angle.
The power plant module 3 may be used to sample and be rotated at mould module 1, can be used for that sample is made to shed module 2 automatically,
Can also be arranged simultaneously and be shed automatically in module 2 at mould module 1 and sample in sample, ensure sample at mould module 1 and sample from
Dynamic module 2 of shedding has different rotating speed or rotation direction.If by the power plant module 3 setting in sample in mould module 1,
It then needs that the rotor 311 on motor 31 is connected with bottom plate 13 using conveyer belt 32, after motor 31 starts, conveyer belt 32 drives bottom
Plate 13 rotates, and bottom plate 13 drives interior at mould cylinder 11 and outer at the synchronous rotation of mould cylinder 12.If by the power plant module 3 setting sample from
It is dynamic to shed in module 2, then need the geometric center for shedding module 2 automatically in sample that shaft 23 is set, by the shaft 23 and motor
Rotor 311 on 31 is connected using conveyer belt 32, and after motor 31 starts, conveyer belt 32 drives shaft 23 to rotate, and shaft 23 drives
Sample is shed module 2 and is rotated automatically.Power plant module 3 in the present embodiment is connected with bottom plate 13, is also set below bottom plate 13
It is useful for the bearing base 7 of installation drive bearing 71, and the drive bearing 71 being arranged inside bearing base 7, for ensureing
Sample at mould module 1 smooth rotation.
Reality is hit to the geotechnical sample to realize, which further includes the hammer for hitting the real hollow cylinder sample,
The hammer is arranged perpendicular to outer at the 12 axle center activity of mould cylinder along closer or far from the outer direction at mould cylinder 12, from outer at mould cylinder 12
Lateral wall at tap it is outer at mould cylinder 12.Can several be set along the outer short transverse at mould cylinder 12, to prevent the hammer pair
It is outer to be damaged at 12 shape of mould cylinder, flexible material may be used and make hammer, such as rubber.Motor 31 drive bottom plate 13 into
When capable rotation, hammer is tapped outside from the outer outer wall at mould cylinder 12 into mould cylinder 12, and is not rotated together at mould cylinder 12 with outer.
Preferably, it is described it is interior at be additionally provided on mould cylinder 11 in closing in mould cylinder 11 at mould cylinder head cover 4, it is described in
Be fixedly connected at the one end of mould cylinder 11 far from bottom plate 13 with interior at mould cylinder head cover 4, the sample shed automatically module 2 with it is described interior
It is fixedly connected far from interior one end at mould cylinder 11 at mould cylinder head cover 4；It is described it is interior at mould cylinder head cover 4 far from the interior side at mould cylinder 11
In the conical surface tilted down, cavity is entered by the conical surface after 22 blanking of discharging end.
It is in the present embodiment, described outer at being additionally provided on mould cylinder 12 for closing outside into the outer at mould cylinder head cover 5 of mould cylinder 12,
It is described it is outer be fixedly connected at the one end of mould cylinder 12 far from bottom plate 13 with outer at mould cylinder head cover 5, be in " hollow ring " shape, internal diameter with
The outer diameter at mould cylinder 12 matches；It is described it is outer at mould cylinder 12 far from the interior side at mould cylinder 11 be equipped with several outer garter springs 6,
The outer garter spring 6 at mould cylinder 12 and is fixed on outer at 12 outside of mould cylinder outside the outer radial package at mould cylinder 12；The outer garter spring 6
Several are linearly provided with along the outer short transverse at mould cylinder 12, the outer garter spring 6 carries out external fastening by nut 61.
As the improvement of the present embodiment, it is described it is outer concentrically surrounded by N number of arc valve at mould cylinder 12, realize to sand
The external compression of hollow cylinder sample is molded；Further include being arranged outside at mould cylinder 12 far from the interior shell at 11 side of mould cylinder, institute
It states shell to be connected with each other by several shrinking connecting-rods with the outer valve at mould cylinder 12, realizes that the outer split at mould cylinder 12 is molded.This
In power plant module 3 in embodiment, mechanical gear transmission can also be used to realize similar functions, realize sample at 1 He of mould module
Sample sheds the relative rotation of module 2 automatically.
In specific sample making course, sample sheds module 2 and throws down sample automatically, in sample sheds dropping process,
For taking a sand grains, for the sand grains：Gravitation provides gravity straight down, is denoted as F1；Motor
During 31 drive bottom plate 13 to rotate, high-speed rotation provides the radially outer centrifugal force of cavity along " hollow cylinder ",
It is denoted as F2, and the centrifugal force is controlled by rotating speed.Molding sand sample gives one support force of the sand grains, is denoted as N.
The quality of the sand grains is denoted as m, and acceleration of gravity is denoted as g, then F1=mg；The angular speed that bottom plate 13 rotates is denoted as
ω, sand and the orthographic projection distance of 13 geometric center of bottom plate are denoted as r, then F2=m ω2r；Molding sand sample F1, F2
And direction and the position relationship of N is as shown in fig. 7, whereabouts mechanism of the sand grains in single unit system is as shown in Figure 8.
It can be obtained according to Pythagorean theorem,The sand grains
Deposition direction and sample be denoted as θ at the angle between the whole axle center of mould module 1,Above formula shows that angle theta is positively correlated with ω,
And it is only controlled by ω.Therefore, the angle theta of sample can be directly determined by controlling rotational speed omega.
Therefore, by adjusting rotating speed size, can adjust gravity F1 straight down and radially outer centrifugal force F2 it
Between proportionate relationship, you can to adjust the direction of total stress suffered by sand grains.In sample making course, above-mentioned total stress is to try
The compacting stress of sample.There are angle thetas for compacting stress and radial direction and vertical direction, then, the depositional plane of prepared sample
With the radial direction of sample, there are angle thetas, and the adjusting that the value of the angle theta can pass through to 13 rotational speed omega of bottom plate is realized.This practicality
Novel advance is mainly reflected in：
(1) high degree of automation of sample is shed.When preparing geotechnical sample using traditional sand replacement method, it must be leaked by long-neck
Bucket, sample raw material are poured into mold.The all manual operationss of this process, increase the workload of experiment.And this practicality
Involved a kind of inclination sand hollow cylinder sample preparation facilities in novel, can by the sample raw material gravity of itself,
By the rotation of instrument itself, so that sample raw material are equably shed, manually-operated task is effectively reduced
Amount；
(2) it vibrates and hits real high degree of automation.When preparing the sample of different dry densities, traditional sand replacement method needs artificial
Ground is stirred the mold for having filled sample raw material using glass bar or manually taps outer mold wall using rubber hammer.This
Utility model, at the rotation of itself of mould module 1, realizes hammer externally at the automatic percussion of mould cylinder 12, and then to sample by sample
It carries out hitting reality.In addition, the tightness degree by adjusting hammer, can adjust the power for hitting implementation, and then reach Control Assay
Compaction rate.
(3) depositional plane direction is controllable.A kind of involved inclination sand hollow cylinder sample prepares dress in the utility model
It sets, the sample by mutually rotating setting sheds module 2 automatically at mould module 1 and sample, realizes radial to depositional plane and sample
The preparation of sand sample in a certain angle, by the way that the adjustment to above-mentioned angle and control may be implemented to the adjusting of 31 rotating speed of motor
System can prepare depositional plane with sample radially in the sand sample of any angle.
(4) favorable repeatability.A kind of involved inclination sand hollow cylinder sample preparation facilities, is adopted in the utility model
With the standardization sample preparation of full automatic method of preparing sample, sample prepares favorable repeatability, and the experiment normalization degree carried out is high.
Finally illustrate, above example is merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng
The utility model is described in detail according to preferred embodiment, it will be understood by those of ordinary skill in the art that, it can be to this
The technical solution of utility model is modified or replaced equivalently, should all without departing from the objective and range of the technical program
Cover in the right of the utility model.
Claims (10)
1. a kind of inclination sand hollow cylinder sample preparation facilities, is used to prepare sand hollow cylinder sample, which is characterized in that packet
It includes：
Sample is at mould module, for the radial extruded sample that exerts a force, including be in " cylinder " it is interior at mould cylinder, it is interior same at mould cylinder with this
Heart nesting be arranged and in " cylinder " it is outer at mould cylinder and in installing at mould cylinder and the outer bottom plate at mould cylinder, it is described interior
Be fixedly connected with the homonymy of bottom plate at mould cylinder with outer at mould cylinder, and it is interior between mould cylinder and the outer cylinder at mould formed be in " hollow cylinder
The cavity of shape "；
Sample sheds module automatically, for shedding sample raw material into cavity, is arranged on side of the cavity far from bottom plate, wraps
It includes the feed end in " infundibulate " and is connected and is used for the discharging end of the blanking into cavity with feed end, axis and cavity axis
Line overlaps setting；
Power plant module, being used to provide power, which makes sample shed module automatically at mould module and sample, produces relative rotation, with sample
Module is shed automatically at mould module and/or sample to be connected.
2. tilting sand hollow cylinder sample preparation facilities as described in claim 1, which is characterized in that the power plant module
Conveyer belt including motor and for transmission, the transmission band connection motor and bottom plate outer rim, after electric motor starting, conveyer belt
Bottom plate rotation is driven, is rotated synchronously at mould cylinder with outer at mould cylinder in bottom plate drive.
3. tilting sand hollow cylinder sample preparation facilities as described in claim 2, which is characterized in that the bottom plate direction
It is additionally provided with drive bearing on the side of cavity.
4. tilting sand hollow cylinder sample preparation facilities as described in claim 1, which is characterized in that the power plant module
The motor and conveyer belt of rotation including shaft and for driving shaft, the shaft shed the axle center of module with sample automatically
It overlaps and sheds module automatically with sample and be fixedly connected, the transmission band connection motor and shaft, after electric motor starting, conveyer belt
Shaft rotation, shaft is driven to drive sample to shed module automatically and rotated.
5. oblique sand hollow cylinder sample preparation facilities as described in claim 1, which is characterized in that further include for hitting reality
The hammer of the hollow cylinder sample, the hammer are lived perpendicular to outer at mould cylinder axle center along closer or far from the outer direction at mould cylinder
Dynamic setting taps outer at mould cylinder.
6. tilting sand hollow cylinder sample preparation facilities as described in claim 5, which is characterized in that the hammer is rubber
Glue hammer.
7. tilting sand hollow cylinder sample preparation facilities as described in claim 1, which is characterized in that further include for sealing
Close it is interior in mould cylinder at mould cylinder head cover, it is described it is interior be fixedly connected at the one end of mould cylinder far from bottom plate with interior at mould cylinder head cover, institute
It states sample and sheds module automatically and interior be fixedly connected far from interior one end at mould cylinder at mould cylinder head cover with described.
8. tilting sand hollow cylinder sample preparation facilities as described in claim 7, which is characterized in that described interior at mould cylinder
Head cover is in the conical surface that tilts down far from the interior side at mould cylinder, enters cavity by the conical surface after discharging end blanking.
9. tilting sand hollow cylinder sample preparation facilities as described in claim 1, which is characterized in that further include for sealing
Close it is outer at the outer at mould cylinder head cover of mould cylinder, it is described it is outer be fixedly connected at the one end of mould cylinder far from bottom plate with outer at mould cylinder head cover, be in
" hollow ring " shape, internal diameter match with the outer diameter at mould cylinder.
10. tilting sand hollow cylinder sample preparation facilities as described in claim 1, which is characterized in that the outer Cheng Mo
Cylinder is equipped with several outer garter springs far from the interior side at mould cylinder, and the outer garter spring is along outer outer at mould cylinder at the radial package of mould cylinder
And it is fixed on outer at mould cylinder outside；The outer garter spring is linearly provided with several along the outer short transverse at mould cylinder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820071990.1U CN207816672U (en) | 2018-01-16 | 2018-01-16 | A kind of inclination sand hollow cylinder sample preparation facilities |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820071990.1U CN207816672U (en) | 2018-01-16 | 2018-01-16 | A kind of inclination sand hollow cylinder sample preparation facilities |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108088720A (en) * | 2018-01-16 | 2018-05-29 | 董彤 | A kind of inclination sand hollow cylinder sample preparation facilities |
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2018
- 2018-01-16 CN CN201820071990.1U patent/CN207816672U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108088720A (en) * | 2018-01-16 | 2018-05-29 | 董彤 | A kind of inclination sand hollow cylinder sample preparation facilities |
| CN108088720B (en) * | 2018-01-16 | 2024-06-25 | 董彤 | Inclined sandy soil hollow cylinder sample preparation device |
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