CN111426535A - Sand rain method hollow cylinder sample preparation device capable of automatically controlling drop distance - Google Patents
Sand rain method hollow cylinder sample preparation device capable of automatically controlling drop distance Download PDFInfo
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- CN111426535A CN111426535A CN202010327894.0A CN202010327894A CN111426535A CN 111426535 A CN111426535 A CN 111426535A CN 202010327894 A CN202010327894 A CN 202010327894A CN 111426535 A CN111426535 A CN 111426535A
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- 239000004576 sand Substances 0.000 title claims abstract description 515
- 238000002360 preparation method Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000000725 suspension Substances 0.000 claims abstract description 42
- 239000002245 particle Substances 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 5
- 101100041681 Takifugu rubripes sand gene Proteins 0.000 claims 81
- 238000012360 testing method Methods 0.000 description 15
- 239000002689 soil Substances 0.000 description 14
- 230000008569 process Effects 0.000 description 11
- 230000008021 deposition Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000005464 sample preparation method Methods 0.000 description 2
- 241000198620 Infundibulicybe gibba Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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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
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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Abstract
The invention discloses a sand rain method hollow cylinder sample preparation device capable of automatically controlling a drop distance, which comprises the following steps: a frame assembly; the sand storage component is used for storing sand required by the sample and is provided with a sand leakage port; the suspension assembly is arranged on the frame assembly, is connected with the sand storage assembly and is used for suspending the sand storage assembly on the frame assembly; the sample mold is communicated with the sand leakage port and is used for receiving sand grains leaked from the sand leakage port; the adjusting piece is connected with the sand storage assembly, and the adjusting piece is matched with the suspension assembly to adjust the height of the sand storage assembly in real time so as to enable the sand leakage drop distance at the sand leakage opening to be unchanged. According to the sand rain method hollow cylindrical sample preparation device capable of automatically controlling the drop distance, the prepared sample is good in uniformity, high in accuracy and good in repeatability.
Description
Technical Field
The invention relates to the technical field of geotechnical test instruments, in particular to a sand rain method hollow cylinder sample preparation device capable of automatically controlling a drop distance.
Background
The stress path that hollow cylinder torsional shear test can be controlled is various, and the stress state that can realize is extensive, has obtained increasingly extensive application. However, at present, no unified hollow cylindrical sample preparation method exists at home and abroad, the sand rain method and the vibration method are adopted, the uniformity of the soil sample prepared by various sample preparation methods is difficult to guarantee, the uniformity of the sample has great influence on the mechanical response of the soil sample, even under the same loading conditions, the initial state of the sample is slightly different, the test result has great difference, the error is often unacceptable, and particularly when the dynamic loading is carried out to study the liquefaction of the soil body. At present, the anisotropy of the soil body becomes a hot point of research in the academic world, and whether the deposition direction of the soil body is uniform or not is a key factor of the quality of a test result during the test.
The sand rain method is one of the important methods for preparing indoor soil test samples, and theoretically, the sand rain method can prepare horizontally deposited soil samples. However, the sand rain method widely adopted at home and abroad for preparing samples at present has a plurality of defects: for example, the influence of sand surface lifting is easily ignored when the sand cylinder is lifted by adopting a manual method, so that the sample is not uniform; when the widely used common funnel is used for shakeout, the size of a sand outlet cannot be adjusted, and for sand grains with small grain sizes, when the sand outlet flow is too large, the sand grains collide with each other in the falling process to influence the deposition effect; in the sample preparation process, the shakeout opening moves above the sample to spray sand, so that the sand surface of the sample is not synchronously raised, the sand surface below the shakeout opening is higher than the periphery, the local part of the sand surface is an inclined surface, the sand falling to the inclined surface is not in a horizontal deposition state, and the falling sand rolls even if the inclined degree is too large, so that the horizontal deposition state of the soil sample is damaged; the side surface of the soil material is not restrained in the falling process, so that the soil material is scattered outside the sample die; in addition, the soil sample needs to be continuously added into the funnel in the sample preparation process, the operation is complex, the sand spraying is not uniform, the repeatability of sample preparation is poor, and an improved space exists.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide a sand rain method hollow cylindrical sample preparation device capable of automatically controlling the drop distance, so that the sample preparation is simple, the prepared sample is uniform, and the repeatability is high.
The sand rain method hollow cylinder sample preparation device capable of automatically controlling the drop distance comprises the following steps: a frame assembly; the sand storage component is used for storing sand required by the sample and is provided with a sand leakage port; the suspension assembly is arranged on the frame assembly, is connected with the sand storage assembly and is used for suspending the sand storage assembly on the frame assembly; the sample mold is communicated with the sand leakage port and is used for receiving sand grains leaked from the sand leakage port; the adjusting piece is connected with the sand storage assembly, and the adjusting piece is matched with the suspension assembly to adjust the height of the sand storage assembly in real time so as to enable the sand leakage drop distance at the sand leakage opening to be unchanged.
According to the sand rain method hollow cylindrical sample preparation device capable of automatically controlling the falling distance, provided by the embodiment of the invention, the adjusting piece connected with the sand storage assembly is arranged, so that when the sand leakage opening of the sand storage assembly leaks sand, the adjusting piece can adjust the height of the sand storage assembly in real time, and the distance between the sand leakage opening and the upper surface of sand grains is kept unchanged, so that the great influence on a test result caused by the rising of the surface of a soil sample along with the sample preparation is avoided, and the prepared sample has good uniformity, high accuracy and good repeatability.
According to the sand rain method hollow cylinder sample preparation device capable of automatically controlling the drop distance, the adjusting piece comprises: the elastic piece is arranged on the frame assembly, one end of the elastic piece is connected with the suspension assembly, the other end of the elastic piece is connected with the sand storage assembly, and the height of the sand storage assembly is adjusted by the elastic piece according to sand grains leaked from the sand leakage opening.
Specifically, the cross-sectional area of the sample mold is s, the dry volume weight of the sand grains is γ, and the rigidity of the elastic member is k, where k is γ × s.
The sand rain method hollow cylinder sample preparation device capable of automatically controlling the drop distance according to the embodiment of the invention further comprises the following steps: the sand shakeout assembly is arranged between the sand storage assembly and the sample mold and comprises a sand divider, and the sand divider is used for distributing sand of the sand storage assembly to the sample mold.
Further, the sand separator includes: the sand separating cone is arranged right below the sand leaking port; and the sand bundling cover is arranged on the outer side of the sand separating cone, and a sand outlet corresponding to the cross section shape of the sample mold is defined between the lower part of the sand separating cone and the lower part of the sand bundling cover.
Optionally, the sand separator further comprises a sand receiving pipe, the sand receiving pipe is arranged above the sand separating cone, the sand storage assembly further comprises a sand leaking pipe, the sand leaking pipe is arranged below the sand leaking port, and at least one part of the sand leaking pipe is inserted into the sand receiving pipe.
Optionally, a sand collecting nozzle is arranged in the sand receiving pipe, and the center line of the sand collecting nozzle coincides with the center line of the sand dividing cone.
Optionally, the sand collecting nozzles comprise a plurality of sand collecting nozzles which are arranged at intervals along the extending direction of the sand receiving pipe.
Optionally, the included angle between the inner wall surface of the sand separating cone and the horizontal plane is α and is larger than the natural angle of repose of the sand grains, and/or the sand bundling cover is in an inverted cone shape, the included angle between the inner wall surface of the sand bundling cover and the horizontal plane is α and is larger than the natural angle of repose of the sand grains, and/or the sand collecting nozzle is in an inverted cone shape, and the included angle between the inner wall surface of the sand collecting nozzle and the horizontal plane is α and is larger than the natural angle of repose of the sand grains.
Optionally, the shakeout assembly further comprises: and the shakeout cylinder is arranged between the sand separator and the sample mould, and is limited with a shakeout cavity with the cross section shape corresponding to the sample mould.
Optionally, the shakeout barrel comprises a plurality of shakeout barrels, and the plurality of shakeout barrels are sequentially connected in a matching manner.
The sand rain method hollow cylinder sample preparation device capable of automatically controlling the drop distance according to the embodiment of the invention further comprises the following steps: the rotating assembly is arranged on the frame assembly and connected with the sand storage assembly, and the rotating assembly is used for driving the sand storage assembly to rotate.
Specifically, the rotating assembly includes: a housing connected with the adjusting member; the middle shaft is connected with the sand storage assembly and is suitable for rotating in the shell to drive the sand storage assembly to rotate.
Optionally, the rotating assembly is a rotating clock spring.
According to the sand rain method hollow cylinder sample preparation device capable of automatically controlling the drop distance, the sand storage assembly comprises: the cylindrical section is arranged at the upper end of the funnel section, the lower end of the funnel section is provided with the sand leakage port, and an opening control switch is arranged at the sand leakage port.
Optionally, the angle between the inner wall surface of the funnel section and the horizontal is α, wherein α is greater than the natural angle of repose of the sand.
According to the sand rain method hollow cylinder sample preparation device capable of automatically controlling the drop distance, the suspension assembly comprises: the suspension wire is connected with the sand storage assembly and used for hanging the sand storage assembly on the frame assembly; and the winding wheel is arranged on the frame assembly and is connected with the suspension wire so as to drive the suspension wire to stretch and retract.
According to the sand rain method hollow cylinder sample preparation device capable of automatically controlling the drop distance, the sample mold comprises the mold outer cylinder and the mold inner cylinder, the mold outer cylinder is sleeved on the outer side of the mold inner cylinder, and the accommodating cavity is defined between the mold outer cylinder and the mold inner cylinder.
Optionally, the accommodating cavity is formed in a ring shape, and the sand leakage port is located on a central line of the accommodating cavity.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of the construction of a sample preparation device according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a sand storage assembly according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a sand separator according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a knockout barrel according to an embodiment of the invention;
FIG. 5 is a schematic structural diagram of a sample mold according to an embodiment of the present invention;
reference numerals:
the sample preparation device 100 is provided with a sample preparation device,
the frame assembly 10, the bracket 11, the base 12,
a suspension assembly 20, a suspension wire 21, a winding wheel 22, a pulley block 23,
a sand storage component 30, a sand leakage opening 301, a cylindrical section 31, a funnel section 32, an opening control switch 33, a sand leakage pipe 34,
the length of the adjustment member 40, the rotation assembly 50,
a shakeout component 60, a sand separator 61, a sand receiving pipe 611, a sand collecting nozzle 612, a sand separating cone 613, a sand bundling cover 614, a sand outlet 615, a shakeout cylinder 62, a shakeout cavity 6201, an outer cylinder 621, an inner cylinder 622,
the sample mold 70, the accommodating cavity 701, the outer mold cylinder 71, the inner mold cylinder 72, and the mold base 73.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A sand rain method hollow cylindrical sample preparation apparatus 100 automatically controlling a drop distance according to an embodiment of the present invention will be described below with reference to fig. 1 to 5.
As shown in fig. 1 to 5, a sand rain method hollow cylindrical sample preparation apparatus 100 for automatically controlling a drop distance according to one embodiment of the present invention includes: the sand storage device comprises a frame assembly 10, a sand storage assembly 30, a suspension assembly 20 and a sample mold 70, wherein the sand storage assembly 30 is arranged on the frame assembly 10, the sand storage assembly 30 is used for storing sand required by a sample, and the sand storage assembly 30 is provided with a sand leakage opening 301. The suspension assembly 20 is arranged on the frame assembly 10, the suspension assembly 20 is connected with the sand storage assembly 30, the suspension assembly 20 is used for suspending the sand storage assembly 30 on the frame assembly 10, the sample mold 70 is communicated with the sand leakage opening 301, and the sample mold 70 receives sand leaked from the sand leakage opening 301.
The sample preparation device 100 further comprises an adjusting member 40, the adjusting member 40 is connected with the sand storage assembly 30, and the adjusting member 40 is matched with the suspension assembly 20 to adjust the height of the sand storage assembly 30 in real time according to the amount of sand leaked from the sand leakage opening 301 or according to the change of the weight of the sand storage assembly 30, so that the falling distance of the sand leakage at the sand leakage opening 301 is kept constant, wherein the falling distance refers to the constant distance between the sand leakage opening 301 and the upper surface of the sand in the sample mold 70. Wherein, the adjusting piece 40 can be installed on the suspension component 20, and the adjustment of the sand grain drop distance is realized through the cooperation of the adjusting piece and the suspension component 20.
According to the sand rain method hollow cylindrical sample preparation device 100 capable of automatically controlling the drop distance, provided by the embodiment of the invention, the adjusting piece 40 connected with the sand storage component 30 is arranged, so that when the sand leakage opening 301 of the sand storage component 30 leaks sand, the adjusting piece 40 can adjust the height of the sand storage component 30 in real time, the distance between the sand leakage opening 301 and the upper surface of sand is kept unchanged, and the problem that the test result is greatly influenced by the rising of the soil sample surface along with the sample preparation is avoided, and therefore, the prepared sample is good in uniformity and high in accuracy.
According to an embodiment of the present invention, the adjusting member 40 includes an electronic scale installed on the upper portion of the sand storage assembly 30, the electronic scale can measure the change of the mass of the sand inside the sand storage assembly 30 in real time, and then the sand storage assembly 30 is lifted by using the suspension assembly 20 controlled by the computer, thereby ensuring that the distance between the sand drain 301 and the upper surface of the sand inside the sample mold 70 is always constant.
As shown in fig. 1, according to an embodiment of the present invention, the adjusting member 40 is an elastic member, the elastic member is disposed on the frame assembly 10, one end of the elastic member is connected to the suspension assembly 20, and the other end of the elastic member is connected to the sand storage assembly 30, the elastic member can adjust the height of the sand storage assembly 30 according to sand leaked from the sand leakage port 301, and the elastic member can be a tension spring with fixed stiffness.
Specifically, as the sand in the sand storage assembly 30 decreases, the elastic member gradually shortens, and the height of the sand leakage port 301 changes, and assuming that the sample height is △L, at the end of sand leakage, the elastic member should be shortened △L, and the shortening changes linearly according to the decrease of the sand mass in the sand storage assembly 30, wherein the cross-sectional area of the sample mold 70 is s, the dry bulk weight of the sand grains is γ, the weight of the sample is γ · s · △L, and the rigidity of the elastic member is k, then k · △L ═ γ · s · △L, that is, k ═ γ × s.
As shown in fig. 1, according to one embodiment of the present invention, the sample preparation apparatus 100 further includes: the shakeout assembly 60 is arranged between the sand storage assembly 30 and the sample mold 70, the shakeout assembly 60 comprises a sand separator 61, the sand separator 61 is used for distributing sand of the sand storage assembly 30 to the sample mold 70, and the sand separator 61 is arranged to uniformly disperse sand in the sand storage assembly 30 into the sample mold 70.
As shown in fig. 3, in some examples, the sand separator 61 includes: a sand separating cone 613 and a sand bundling cover 614, wherein the sand separating cone 613 is arranged right below the sand leakage port 301, the sand bundling cover 614 is arranged outside the sand separating cone 613, a sand outlet 615 is defined between the lower part of the sand separating cone 613 and the lower part of the sand bundling cover 614, the sand outlet 615 corresponds to the cross section shape of the sample mold 70, for example, the sample mold 70 is formed into a ring shape, and the sand outlet 615 forms a ring-shaped sand outlet.
Specifically, the sand separating cone 613 is a conical surface with an upward vertex, the vertex of the conical surface and the center of the sand leaking port 301 are on the same vertical line, and sand particles impact the sand separating cone 613 and are uniformly dispersed; the lower portion of the sand containment 614 is a portion of a conical surface concentric with the sand separation cone 613. the sand containment 614 is used to confine the sand dispersed by the sand separation cone 613, and the sand bounces back and forth between the sand separation cone 613 and the sand containment 614 and is eventually evenly distributed within the sample mold 70. In this case, the sand separating cone 613 and the sand-bundling cover 614 should be connected so that they are integrated, but the projection of the connection on the horizontal plane must be small to reduce the influence on the shakeout.
As shown in fig. 3, in some examples, the sand separator 61 further includes a sand receiving pipe 611, the sand receiving pipe 611 is disposed above the sand separating cone 613, the sand storage assembly 30 further includes a sand leaking pipe 34, the sand leaking pipe 34 is disposed below the sand leaking port 301, and at least a portion of the sand leaking pipe 34 is inserted into the sand receiving pipe 611, that is, an overlapping portion exists between the sand leaking pipe 34 and the sand receiving pipe 611, and the length of the overlapping portion is greater than the height of sand that can be accommodated in the sample mold 70, so as to ensure that the sand leaking pipe 34 and the sand receiving pipe 611 have an overlapping length at the end of sanding, and sand is not spilled out of the sand receiving pipe 611.
As shown in fig. 3, in some examples, a sand collecting nozzle 612 is disposed in the sand receiving pipe 611, a center line of the sand collecting nozzle 612 coincides with a center line of the sand dividing cone 613, the sand collecting nozzle 612 is formed in an inverted cone shape, a large opening of the sand collecting nozzle faces upward, a small opening is disposed at a lower portion of the sand collecting nozzle, a center of the small opening of the sand collecting nozzle 612 is on the same vertical line with a vertex of the sand dividing cone 613, the sand collecting nozzle 612 can collect sand bundles received by the sand receiving pipe 611 into a uniform and continuous sand flow, so that the sand flow leaked from the sand leaking pipe 34 falls along a central axis of the sand receiving pipe 611 and is collected by the sand collecting nozzle 612, sand particles face to the vertex of the sand dividing cone 613, and sand particles are evenly distributed along a circumference.
In some examples, the sand collecting nozzles 612 include a plurality of sand collecting nozzles 612, the plurality of sand collecting nozzles 612 are arranged at intervals along the extending direction of the sand receiving pipe 611, the distance between two sand collecting nozzles 612 may be the same or different, and by providing the plurality of sand collecting nozzles 612, the sand flow of the cluster directly impacts the vertex of the sand separating cone 613, thereby facilitating uniform dispersion.
In some examples, the angle between the inner wall surface of the sand separating cone 613 and the horizontal plane is α, which is larger than the natural angle of repose of the sand, so as to avoid sand remaining in the sand separating cone 613, ensure that the sand can automatically slide down during sample preparation, and ensure the accuracy and reliability of the test.
In some examples, the sand pack 614 is formed into an inverted cone shape, and the included angle between the inner wall surface of the sand pack 614 and the horizontal plane is α which is larger than the natural angle of repose of the sand, so that the sand is prevented from remaining in the sand pack 614, the sand can automatically slide down in the sample preparation process, and the accuracy and reliability of the test are ensured.
In some examples, the sand collecting nozzle 612 is formed into an inverted cone shape, and the included angle between the inner wall surface of the sand collecting nozzle 612 and the horizontal plane is α, which is larger than the natural angle of repose of the sand, so that the sand is prevented from remaining in the sand collecting nozzle 612, the sand can automatically slide down in the sample preparation process, and the accuracy and reliability of the test are ensured.
As shown in fig. 4, in some examples, the shakeout assembly 60 further includes: the shakeout cylinder 62 is arranged between the sand separator 61 and the sample mold 70, the shakeout cylinder 62 defines a shakeout cavity 6201 with the cross section shape corresponding to that of the sample mold 70, and the shakeout cylinder 62 can play a role in restraining sand grains so that the sand grains fall along the shakeout cavity 6201. Specifically, the annular shakeout cylinder 62 comprises an inner cylinder 622 and an outer cylinder 621, an annular cylindrical shakeout cavity 6201 is formed between the inner cylinder 622 and the outer cylinder 621, and the inner cylinder 622 and the outer cylinder 621 are not connected in the shakeout cavity 6201, so that sand grains are not blocked in the falling process.
The shakeout cylinder 62 is arranged at the lower part of the sand separator 61, the lower part of the sand separating cone 613 corresponds to the inner cylinder of the shakeout cylinder 62, and the lower part of the sand restraining cover 614 corresponds to the outer cylinder of the shakeout cylinder 62 and is slightly overlapped to ensure fixation, so that dislocation cannot occur.
In some examples, the shakeout cylinder 62 includes a plurality of shakeout cylinders 62, and the plurality of shakeout cylinders 62 are sequentially connected in a matching manner, that is, the shakeout cylinder 62 may be segmented, the length of each segment is determined according to actual needs, segments with different lengths may be provided, so that different length distances may be assembled, the connection form between the segments is various, a threaded connection may be adopted, an insertion connection may also be adopted, or other manners, which is not limited herein.
As shown in fig. 1, according to one embodiment of the present invention, the sample preparation apparatus 100 further includes: the rotating assembly 50 is arranged on the frame assembly 10, the rotating assembly 50 is connected with the sand storage assembly 30, the rotating assembly 50 is used for driving the sand storage assembly 30 to rotate, the rotating assembly 50 drives the sand storage assembly 30 to rotate, so that the sand leaking port 301 is used for sanding in a rotating mode, and then falling sand flow can be evenly distributed into the sample mold 70.
In some examples, the rotating assembly 50 includes a housing coupled to the adjusting member 40 and a central axle coupled to the sand storage assembly 30, the central axle adapted to rotate within the housing to rotate the sand storage assembly 30.
In some specific examples, the rotating assembly 50 may be a rotating spring, the upper part of the sand storage assembly 30 is connected with the rotating spring, and the sand leaking pipe 34 at the lower part of the sand storage assembly 30 extends into the sand receiving pipe 611 of the sand separator 61. When the rotating spring is full, the middle shaft rotates when the rotating spring is released, the lower sand storage component 30 is driven to rotate, the sand leaking pipe 34 can scatter sand in a rotating mode, and the sand distributor 61 can evenly distribute falling sand into the sample mold 70.
Ideally, the sand flow leaking from the sand leaking pipe 34 falls along the central axis of the sand receiving pipe 611, and is collected by the sand collecting nozzle 612, the sand flow is opposite to the vertex of the sand separating cone 613, and the sand flow is evenly distributed along the circumference. However, in actual operation, the sand spilled from the sand leaking pipe 34 does not necessarily fall along the central axis of the sand receiving pipe 611, and there is a certain deviation, and at this time, the sand flow gathered by the plurality of sand gathering nozzles 612 is relatively concentrated near the central axis, but there is a deviation, and it is found in practice that the sand surface of the manufactured sample is not synchronously lifted, and a slight height on one side and a low height on the other side occur, and the horizontal deposition state is not ideal. At this time, by providing the rotating unit 50, the sand leaking pipe 34 is rotated to perform sanding, and even if the spilled sand flow has an eccentricity, the sand flow is rotated to spill the sand, and the eccentricity is averaged over the entire sanding process. Practice proves that the sand surface made by the rotary sand sprinkling is lifted synchronously, the purpose of horizontal deposition is achieved, and the effect is ideal.
As shown in fig. 2, according to one embodiment of the present invention, the sand storage assembly 30 includes: the cylindrical section 31 is arranged at the upper end of the funnel section 32, the lower end of the funnel section 32 is provided with a sand leakage opening 301, wherein an opening control switch 33 is arranged at the sand leakage opening 301, and the opening control switch 33 can adjust the flow rate of the leaked sand according to the size of the grain size of the sand. For sand grains with small grain sizes, the sand flow is reduced, the mutual collision in the falling process of the sand grains is avoided, the sedimentation effect is prevented from being influenced, and the sedimentation effect is basically the same as the typical horizontal sedimentation.
Wherein the cylindrical section 31 and the funnel section 32 comprise a volume that is capable of holding the entire amount of sand required for the next sample. The sand leaking pipe 34 is a slender hollow round pipe, sand leaks from the pipe into the sand connecting pipe 611, the sand leaking pipe 34 is further arranged at the lower part of the funnel section 32, and the opening control switch 33 is positioned at the upper part of the sand leaking pipe 34 and can adjust the flow rate of the leaked sand according to the size of the sand grain size.
In some examples, the angle between the inner wall surface of the funnel section 32 and the horizontal plane is α, wherein α is larger than the natural angle of repose of the sand, thereby avoiding the sand from remaining in the funnel section 32, ensuring that the sand can automatically slide down during the sample preparation process, and ensuring the accuracy and reliability of the test.
As shown in fig. 1, according to one embodiment of the present invention, a suspension assembly 20 includes: hang suspension wire 21 and reel 22, hang suspension wire 21 and be connected with storage sand subassembly 30, be used for hanging storage sand subassembly 30 and establish on frame subassembly 10, frame subassembly 10 is located to reel 22, reel 22 is connected with hanging suspension wire 21 and is stretched out and draw back with drive suspension wire 21, when hanging suspension wire 21 extends, it can the downstream to store up sand subassembly 30, reduce the fall distance of spilling sand, when hanging suspension wire 21 shortens, it can upwards move about to store up sand subassembly 30, increase the fall distance of spilling sand, from this through movable reel 22, can adjust the basic fall distance of spilling sand, and convenient operation.
Further, the suspension assembly 20 further comprises a pulley block 23, the pulley block 23 is fixed on the frame assembly 10, and the suspension wire 21 is arranged on the pulley block 23, so that the suspension wire 21 can slide and stretch, friction is reduced, and the stability of the structure is improved.
As shown in fig. 5, according to an embodiment of the present invention, the sample mold 70 includes an outer mold cylinder 71 and an inner mold cylinder 72, the outer mold cylinder 71 is sleeved outside the inner mold cylinder 72, and a receiving cavity 701 is defined between the outer mold cylinder 71 and the inner mold cylinder 72, wherein the knockout cylinder 62 is formed into a corresponding ring shape, an outer cylinder 621 of the knockout cylinder 62 is placed on the outer mold cylinder 71, and an inner cylinder 622 of the knockout cylinder 62 is placed on the inner mold cylinder 72 and slightly overlapped to ensure fixing without dislocation.
In some examples, the accommodating cavity 701 forms a ring shape, the sand leakage port 301 is located on the central line of the accommodating cavity 701, and further, the central lines of the elastic member, the sand storage assembly 30, the sand separator 61, the shakeout cylinder 62 and the sample mold 70 should be on the same vertical line, so that the falling sand flow can be evenly distributed into the accommodating cavity 701, and thus the accuracy of the test can be ensured.
An embodiment of the apparatus 100 for preparing a sand rain hollow cylinder sample with automatically controlled drop distance according to the present invention will be described with reference to fig. 1 to 5.
The sample preparation device 100 comprises a frame assembly 10, a suspension assembly 20, an adjusting member 40, a rotating assembly 50, a sand storage assembly 30, a shakeout assembly 60 and a sample mold 70, wherein the sample mold 70 comprises a mold outer cylinder 71, a mold inner cylinder 72 and a mold base 73.
The sand storage assembly 30 includes: the sand leakage testing device comprises a cylindrical section 31, a funnel section 32, an opening control switch 33 and a sand leakage pipe 34, wherein the funnel section 32 is connected with the cylindrical section 31 and the sand leakage pipe 34, and the volumes contained in the cylindrical section 31 and the funnel section 32 can contain all sand required by the next sample. The opening control switch 33 is positioned at the upper part of the sand leakage pipe 34 and can adjust the flow rate of the leaked sand according to the size of the sand grain size.
The annular knockout drum 62 includes: the lower part of the sand separating cone 613 corresponds to the inner cylinder 622 of the annular sand shakeout cylinder 62, and the lower part of the sand bundling cover 614 corresponds to the outer cylinder 621 of the annular sand shakeout cylinder 62. The lower portion of the annular knockout drum 62 is a sample die 70.
The included angle between the inner wall surface of the sand separating cone 613 and the horizontal plane is α, the sand bundling cover 614 is in an inverted cone shape, the included angle between the inner wall surface of the sand bundling cover 614 and the horizontal plane is α, the sand collecting nozzle 612 is in an inverted cone shape, the included angle between the inner wall surface of the sand collecting nozzle 612 and the horizontal plane is α, and the included angle between the inner wall surface of the funnel section 32 of the sand storage component 30 and the horizontal plane is α which is larger than the natural angle of repose of the sand, so that sand particles are prevented from remaining in the sample preparation device.
Firstly, the relation between different drop distances and the relative density of a sample is calibrated, then an elastic member with the corresponding drop distance and the corresponding rigidity is selected according to the relative density required by a test, wherein the rigidity of the elastic member is determined by k-gamma × s, then the whole sand amount required by one sample is weighed and poured into the sand storage component 30 at one time, the suspension component 20 is adjusted to reach the specified drop distance, then an annular sand falling cylinder 62 with the matched length is assembled according to the drop distance and placed above the sample mold 70, then an annular sand distributor 61 is placed above the annular sand falling cylinder 62, the sand leakage pipe 34 of the sand storage component 30 extends into the sand receiving pipe 611 of the annular sand distributor 61, the overlapped length of the annular sand falling cylinder 62, the annular sand distributor 61 and the central axis of the sand storage component 30 is ensured to be on the same vertical line during operation.
Secondly, the spiral spring is fully wound, the opening control switch 33 is adjusted according to the size of the grain size of the sample sand, so that the falling sand forms uniform and continuous sand flow, the sand flow is as small as possible, the collision among the sand grains is less in the falling process of the sand grains in the annular sand falling cylinder 62, and the free falling state is ensured. The sand storage assembly 30 rotates continuously in the whole process, the rotating sand flow which is spilled from the sand leaking pipe 34 is evenly distributed into the circular ring, and sand grains continuously fall until the deposition of the sample is finished. In the sand sprinkling process, the sand surface of the sample gradually rises, and the elastic piece gradually contracts to ensure that the falling distance is constant. In the sample deposition process, the sand surface is synchronously raised, and sand does not move after falling to the sand surface, so that the horizontal deposition effect is ensured.
According to the embodiment of the invention, in the sample preparation process, the device can automatically adjust the height of the sand leakage port according to the height of the sand surface in the sample, so that the falling distance is kept constant in the whole sample preparation process; the sand sprinkling flow is adjustable, continuous and stable sand flow can be formed, the influence of mutual impact in the falling process of sand grains is reduced, and free falling is ensured; in the sand sprinkling process, sand grains are uniformly scattered in the range of the annular sample, the sand surface of the sample is synchronously raised, the sand grains do not roll any more after being scattered, and the horizontal deposition state of the soil sample is ensured; the sand sprinkling process has the advantages that sand particles cannot fall outside the die, the sand amount required by the whole sample can be added at one time, the operation is simple, the uniformity of the sample is ensured, the uniformity of the prepared sample is good, the accuracy is high, and the repeatability is good.
Other configurations and operations of the sand-rain method hollow cylindrical sample preparation device 100 for automatically controlling the drop distance according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not directly, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (19)
1. The utility model provides an automatic sand rain method hollow cylinder sample preparation facilities of control drop distance which characterized in that includes:
a frame assembly;
the sand storage component is used for storing sand required by the sample and is provided with a sand leakage port;
the suspension assembly is arranged on the frame assembly, is connected with the sand storage assembly and is used for suspending the sand storage assembly on the frame assembly;
the sample mold is communicated with the sand leakage port and is used for receiving sand grains leaked from the sand leakage port;
the adjusting piece is connected with the sand storage assembly, and the adjusting piece is matched with the suspension assembly to adjust the height of the sand storage assembly in real time so as to enable the sand leakage drop distance at the sand leakage opening to be unchanged.
2. The apparatus according to claim 1, wherein the adjusting member is an elastic member, the elastic member is disposed on the frame assembly, one end of the elastic member is connected to the suspension assembly, the other end of the elastic member is connected to the sand storage assembly, and the elastic member adjusts the height of the sand storage assembly according to sand particles leaked from the sand leakage port.
3. The apparatus according to claim 2, wherein the cross-sectional area of the sample mold is s, the dry volume weight of the sand grains is γ, and the rigidity of the elastic member is k, wherein k is γ × s.
4. The apparatus for preparing a sand rain hollow cylindrical sample with an automatically controlled drop distance according to claim 1, further comprising: the sand shakeout assembly is arranged between the sand storage assembly and the sample mold and comprises a sand divider, and the sand divider is used for distributing sand of the sand storage assembly to the sample mold.
5. The sand rain method hollow cylindrical sample preparation device of automatically controlling drop distance according to claim 4, wherein the sand separator comprises:
the sand separating cone is arranged right below the sand leaking port;
and the sand bundling cover is arranged on the outer side of the sand separating cone, and a sand outlet corresponding to the cross section shape of the sample mold is defined between the lower part of the sand separating cone and the lower part of the sand bundling cover.
6. The device for preparing the sand rain method hollow cylinder sample with the automatic control of the drop distance as claimed in claim 5, wherein the sand separator further comprises a sand receiving pipe, the sand receiving pipe is arranged above the sand separating cone, the sand storage assembly further comprises a sand leaking pipe, the sand leaking pipe is arranged below the sand leaking port, and at least one part of the sand leaking pipe is inserted into the sand receiving pipe.
7. The sand rain method hollow cylinder sample preparation device capable of automatically controlling the drop distance according to claim 6, characterized in that a sand collecting nozzle is arranged in the sand receiving pipe, and the center line of the sand collecting nozzle is coincident with the center line of the sand separating cone.
8. The sand rain method hollow cylindrical sample preparation device capable of automatically controlling the drop distance according to claim 7, wherein the sand collection nozzles comprise a plurality of sand collection nozzles which are arranged at intervals along the extending direction of the sand receiving pipe.
9. The sand rain method hollow cylindrical sample preparation device capable of automatically controlling the drop distance according to claim 7, wherein the included angle between the inner wall surface of the sand dividing cone and the horizontal plane is α larger than the natural angle of repose of the sand grains, and/or,
the sand binding cover is formed into an inverted cone, the included angle between the inner wall surface of the sand binding cover and the horizontal plane is α which is larger than the natural angle of repose of the sand grains, and/or,
the sand collecting nozzle is in an inverted cone shape, and the included angle between the inner wall surface of the sand collecting nozzle and the horizontal plane is α which is larger than the natural angle of repose of the sand grains.
10. The apparatus for preparing a sand rain hollow cylindrical sample with automatically controlled drop distance according to claim 4, wherein the sand-dropping assembly further comprises: and the shakeout cylinder is arranged between the sand separator and the sample mould, and is limited with a shakeout cavity with the cross section shape corresponding to the sample mould.
11. The apparatus for preparing a sand rain hollow cylinder sample according to claim 10, wherein the plurality of sand dropping cylinders are sequentially connected in a matching manner.
12. The sand rain method hollow cylindrical sample preparation device of automatically controlling a drop distance according to any one of claims 1 to 11, further comprising: the rotating assembly is arranged on the frame assembly and connected with the sand storage assembly, and the rotating assembly is used for driving the sand storage assembly to rotate.
13. The apparatus of claim 12, wherein the rotation assembly comprises:
a housing connected with the adjusting member;
the middle shaft is connected with the sand storage assembly and is suitable for rotating in the shell to drive the sand storage assembly to rotate.
14. The apparatus according to claim 13, wherein the rotating member is a rotating spring.
15. The apparatus for preparing a sand rain hollow cylinder sample according to any one of claims 1 to 11, characterized in that the sand storage assembly comprises: the cylindrical section is arranged at the upper end of the funnel section, the lower end of the funnel section is provided with the sand leakage port, and an opening control switch is arranged at the sand leakage port.
16. The apparatus of claim 15, wherein the inner wall of the funnel section is at an angle of α from the horizontal, wherein α is greater than the natural angle of repose of the sand particles.
17. The apparatus for preparing a sand rain hollow cylindrical sample with an automatically controlled drop distance according to any one of claims 1 to 11, wherein the suspension assembly comprises:
the suspension wire is connected with the sand storage assembly and used for hanging the sand storage assembly on the frame assembly;
and the winding wheel is arranged on the frame assembly and is connected with the suspension wire so as to drive the suspension wire to stretch and retract.
18. The sand rain method hollow cylinder sample preparation device capable of automatically controlling the drop distance according to any one of claims 1 to 11, wherein the sample mold comprises an outer mold cylinder and an inner mold cylinder, the outer mold cylinder is sleeved outside the inner mold cylinder, and a holding cavity is defined between the outer mold cylinder and the inner mold cylinder.
19. The apparatus according to claim 18, wherein the receiving chamber is formed in a ring shape, and the sand-leaking port is located on a center line of the receiving chamber.
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