CN116482002A - Grain quantity detection device and method based on grain pile form change - Google Patents
Grain quantity detection device and method based on grain pile form change Download PDFInfo
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- CN116482002A CN116482002A CN202310720327.5A CN202310720327A CN116482002A CN 116482002 A CN116482002 A CN 116482002A CN 202310720327 A CN202310720327 A CN 202310720327A CN 116482002 A CN116482002 A CN 116482002A
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- 238000001514 detection method Methods 0.000 title claims abstract description 42
- 230000008859 change Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 16
- 238000007789 sealing Methods 0.000 claims abstract description 45
- 230000001788 irregular Effects 0.000 claims abstract description 8
- 230000000903 blocking effect Effects 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 21
- 238000001771 vacuum deposition Methods 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 230000008014 freezing Effects 0.000 claims description 4
- 238000007710 freezing Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000004660 morphological change Effects 0.000 claims 7
- 238000005056 compaction Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 5
- 238000012795 verification Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000013079 data visualisation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012800 visualization 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
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
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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
- G01B5/0021—Measuring arrangements characterised by the use of mechanical techniques for measuring the volumetric dimension of an object
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N2015/1024—Counting particles by non-optical means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/51—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture specially adapted for storing agricultural or horticultural products
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Abstract
The invention discloses a grain quantity detection device based on grain pile form change and a detection method thereof, comprising a sealing tank which is vertically arranged and contains a grain pile to be detected, wherein a fixed die tray is axially and limitedly overlapped at the upper part of the sealing tank, and a vacuum sleeve film is hermetically clamped at an overlapped gap between the sealing tank and the fixed die tray; the vacuum sleeve film is of a pocket-shaped structure with an opening at the top and a blocking bottom, the bottom surface of the vacuum sleeve film is sealed and attached to the top surface of the grain pile to be detected, and the vacuum sleeve film and the fixed mold tray divide the inside of the sealed tank into a low-temperature fixed mold cavity, a normal-pressure taking mold cavity and a negative-pressure grain cavity which are sequentially arranged from top to bottom; filling a grain pile to be detected in a negative pressure grain cavity in a negative pressure tight mode, wherein the irregular top surface of the grain pile to be detected is sealed and attached by a vacuum sleeve film; the detection device solidifies the surface form of the grain pile in a mode of simulating the compaction density of the grains in the real granary, so that the surface of the grain pile is taken out in a contact mode, the grain pile form is not damaged, the contact model is constructed more feasible, and the precision is higher.
Description
Technical Field
The invention relates to the technical field of grain storage and detection, in particular to a grain quantity detection device and a grain quantity detection method based on grain pile form change.
Background
Along with the continuous development and upgrading of the national grain industry informatization supervision technology, the' quantity of the national reserved grains is ensured to be real, and the quality is good, which is the basic requirement of the country on the management of the reserved grains. In order to realize 'real quantity', the national part grain depot builds an online grain quantity monitoring system, and the system can collect grain pile surface measuring point data for calculating grain pile volume and weight no matter in laboratory verification equipment or real grain depot.
Technical solutions exist in the prior art for generating a three-dimensional model of a grain pile, such as:
CN115375853a discloses a method for generating a three-dimensional model of bulk grain piles in a granary, and a device and a computer-readable storage medium for generating the three-dimensional model of bulk grain piles in a granary. The method comprises the following steps: acquiring space rectangular coordinate data of the top surface of a grain pile in a granary; processing the space rectangular coordinate data of the top surface of the grain pile by adopting a mode of mutually matching Java and graphic software to generate a grain pile three-dimensional model; the graphic software is MATLAB or ECharts data visualization chart library. The method adopts a mode of mutually matching Java and graphic software to generate the grain pile three-dimensional model, is more friendly to a rear-end engineer, combines the advantages of the two tools, realizes advantage complementation, reduces the development difficulty of the grain pile three-dimensional model, improves the development efficiency, can not only meet the business requirement of grain depot users on the three-dimensional visualization of the grain pile, but also intuitively reflect the form of the grain pile, replaces video pictures in a warehouse, and saves construction funds.
However, the current shooting type image modeling method often has defects, particularly when grains are discharged from the bottom of the grain pile, conical vortex-shaped pits are formed on the top surface of the grain pile; when the top of the grain pile is filled with grains, hillside-shaped bulges are generated on the top of the grain pile; namely, after being blocked by the collapse edge of the grain pile or the protruding part of the grain pile, the pits and the protrusions can block the image shooting instrument, and the grain pile surface model cannot be accurately constructed by an image shooting method, so that the acquisition difficulty of the grain pile surface morphology is improved, and the modeling precision of the grain pile is reduced.
Therefore, how to design a grain quantity detection device and a grain quantity detection method based on grain pile form change, the feasibility of other measurement modeling equipment and methods except the existing image acquisition modeling method can be verified in a laboratory and implemented in a real granary, and the accuracy verification is performed, so that the problem of three-dimensional model modeling accuracy when irregular waves, pits and bulges exist on the surface of the grain pile is solved, and the technical problem to be solved urgently by the person in the field is solved.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a grain quantity detection device and a grain quantity detection method based on grain pile form change.
The grain quantity detection device based on grain pile form change comprises a sealing tank which is vertically arranged and used for accommodating a grain pile to be detected, wherein a fixed die tray is axially and limitedly overlapped at the upper part of the sealing tank, and a vacuum sleeve film is hermetically clamped at an overlapping gap between the sealing tank and the fixed die tray; the vacuum sleeve film is of a pocket-shaped structure with an opening at the top and a blocking bottom, the bottom surface of the vacuum sleeve film is sealed and attached to the top surface of the grain pile to be detected, and the vacuum sleeve film and the fixed mold tray divide the inside of the sealed tank into a low-temperature fixed mold cavity, a normal-pressure taking mold cavity and a negative-pressure grain cavity which are sequentially arranged from top to bottom; filling a grain pile to be detected in a negative pressure grain cavity in a negative pressure tight mode, wherein the irregular top surface of the grain pile to be detected is sealed and attached by a vacuum sleeve film; the bottom surface of the fixed die tray vertically penetrates through the fixed die tray and is connected with a plurality of depth measuring rods with equal length in a sliding sealing manner, the top ends of the depth measuring rods upwards extend to the low-temperature fixed die cavity for low-temperature setting, and the bottom ends of the depth measuring rods downwards extend to the normal-pressure die taking cavity and are attached and supported by a vacuum sleeve film on the top surface of the grain pile to be detected.
The sealing tank comprises a tank body and a sealing plate, wherein the top of the tank body is opened and fixedly plugged and connected with the sealing plate, and the tank body and the sealing plate are matched with an axial sealing clamping fixed die tray and a vacuum sleeve film; a plurality of conveying pipes communicated with the low-temperature fixed die cavity are fixedly arranged on the sealing plate.
The low Wen Dingmo cavity is surrounded by the fixed mold tray and the sealing plate, the lower part of the low-temperature fixed mold cavity is filled with filling liquid for freezing the fixed depth measuring rod, and the upper part of the low-temperature fixed mold cavity is communicated with the conveying pipe and is filled with a low-temperature medium.
The filling liquid is water; the low-temperature medium is liquid nitrogen.
And the normal pressure taking die cavity is surrounded by a vacuum sleeve film and a fixed die tray, wherein the periphery of the vacuum sleeve film is closely attached to the circumferential inner wall of the tank body, and the bottom of the vacuum sleeve film supports the bottom end of the depth measuring rod in an irregular wave shape on the upper surface of the grain pile to be detected.
The negative pressure grain cavity is surrounded by the inner wall of the lower part of the tank body and the vacuum sleeve film, and a vacuum pipe communicated with the negative pressure grain cavity is fixedly arranged on the tank body; one end of the vacuum tube facing the negative pressure grain cavity is fixedly provided with a grate net.
Moreover, a graduated scale is manufactured on the circumferential outer wall of the depth measuring rod, and a sensor is fixedly arranged at the bottom end of the depth measuring rod.
And a discharge hole is formed in the bottom of the sealing tank.
A detection method of a grain quantity detection device based on grain pile form change comprises the following steps:
step 1, filling grains into the lower part of a tank body, and covering the top surface of a grain pile with a vacuum tube to form a negative pressure grain cavity; meanwhile, controlling the wave form of the upper surface of the grain pile according to the detection requirement;
step 2, sleeving a vacuum coating film in the tank body, wherein a redundant part is reserved at the bottom of the vacuum coating film to adapt to the upper surface form of the grain pile, and the top opening of the vacuum coating film is lapped at the top opening of the tank body;
step 3, inserting a fixed mould tray inserted with a depth measuring rod into the tank body from the top opening, sealing and clamping a vacuum sleeve film by matching with the sealing plate and the opening of the tank body, and enabling the bottom end of the depth measuring rod to be attached to the vacuum sleeve film on the upper surface of the grain pile under the driving of self gravity;
step 4, air at grain gaps in the negative pressure grain cavity is pumped out from the vacuum tube, the gap amount of the grain particles pressed in the large grain pile is regulated and simulated according to the magnitude of the negative pressure, and meanwhile, the vacuum coating film is tightly attached to the upper surface of the grain pile;
step 5, filling liquid is injected into the low-temperature fixed die cavity through a conveying pipe, and then a low-temperature medium is injected into the low-temperature fixed die cavity through the conveying pipe to freeze the filling liquid, so that a depth measuring rod is fixed on the fixed die tray;
step 6, integrally disassembling the fixed die tray, wherein a plurality of depth measuring rods are frozen and fixed on the fixed die tray, and manually recording graduated scale data of the downward detection depth of the depth measuring rods, or acquiring the downward detection depth data of the depth measuring rods and waveform data of the surface of the grain pile by a sensor, so as to calculate the initial total volume of the grain pile in the tank body and record the initial total volume as initial data of the grain pile shape;
step 7, a discharge hole at the bottom of the sealed tank is opened, a small amount of grains which are used for calibration and need to be counted are leaked, the steps 1 to 6 are repeated, the secondary total volume of the grain pile in the tank is calculated, and secondary data of the grain pile form is recorded;
step 8, verifying the relation between the grain pile form change including waveform and depth and the grain quantity by combining the grain quantity leaked in the step 7 according to the grain pile total volume difference value obtained in the step 6 and the step 7, and performing measurement calibration under the same negative pressure condition, namely under the same grain density condition;
step 9, actually measuring, repeating the steps 1 to 7, and measuring and calculating the actually leaked grain quantity by the total volume difference of the grain piles in the step 8 when grains with unknown quantity are leaked from the discharge hole in the step 7.
The invention has the advantages and technical effects that:
according to the grain quantity detection device based on grain pile form change, grains are contained in the sealed tank and grain piles stored in the granary in a sealed mode are simulated; applying negative pressure to a negative pressure grain cavity in the sealed tank through a vacuum pipe, on one hand, simulating grain gaps of grains in a large grain pile under laboratory verification conditions, and on the other hand, enabling a vacuum sleeve film to be flexibly attached to the upper surface of the grain pile so as to realize structural solidification of sloping surfaces, collapse and other positions of the surface of the grain pile, and avoiding damage to the natural form of the top surface of the grain pile after a depth measuring rod contacts the top surface of the grain pile; the surface morphology and the downward detection depth of the grain pile are measured through the lamination of a plurality of depth measuring rods, the depth measuring rods are fixed on the fixed die tray through frozen filling liquid in the fixed die tray, and manual and sensor secondary comparison measurement and verification are conveniently carried out after the depth measuring rods are taken out, so that the sampling of the depth measuring rods and the modeling precision of the surface of the grain pile are improved. Finally, by the detection method, the grain sizes and the grain gaps of the same grain are calibrated, the total volume change of the grain model before and after the change of the morphology of the same grain stack is measured, and finally the grain number change before and after the change of the morphology of the same grain stack is calculated.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic perspective view of the present invention (with the closure plate removed);
FIG. 3 is a semi-sectional view of the present invention;
FIG. 4 is a schematic diagram showing the comparison of the surface morphology and volume relationship of a grain pile according to the present invention;
in the figure: 1-sealing plates; 2-a conveying pipe; 3-a tank body; 4-vacuum tube; 5-a fixed mold tray; 6-depth measuring rod; 7-filling liquid; 8-vacuum coating; 9-a sensor; 10-grating net; 11-a discharge hole; 12-a negative pressure grain cavity; 13-taking the die cavity at normal pressure; 14-low temperature molding cavity.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The grain quantity detection device based on grain pile form change comprises a sealing tank which is vertically arranged and used for accommodating a grain pile to be detected, wherein a fixed die tray 5 is axially and limitedly overlapped at the upper part of the sealing tank, and a vacuum sleeve film 8 is hermetically clamped at an overlapping gap between the sealing tank and the fixed die tray; the vacuum sleeve film is of a pocket-shaped structure with an opening at the top and a blocking bottom, the bottom surface of the vacuum sleeve film is sealed and attached to the top surface of the grain pile to be detected, and the vacuum sleeve film and the fixed mold tray divide the inside of the sealed tank into a low-temperature fixed mold cavity 14, a normal-pressure taking mold cavity 13 and a negative-pressure grain cavity 12 which are sequentially arranged from top to bottom; filling a grain pile to be detected in a negative pressure grain cavity in a negative pressure tight mode, wherein the irregular top surface of the grain pile to be detected is sealed and attached by a vacuum sleeve film; the bottom surface of the fixed die tray vertically penetrates through the fixed die tray and is connected with a plurality of depth measuring rods 6 with equal length in a sliding sealing manner, the top ends of the depth measuring rods upwards extend to the low-temperature fixed die cavity for low-temperature setting, and the bottom ends of the depth measuring rods downwards extend to the normal-pressure die taking cavity and are attached and supported by a vacuum sleeve film on the top surface of the grain pile to be detected.
The sealed tank comprises a tank body 3 and a sealing plate 1, wherein the top of the tank body is opened and fixedly plugged and connected with the sealing plate, and the tank body and the sealing plate are matched with an axial sealing clamping fixed die tray and a vacuum sleeve film; a plurality of conveying pipes 2 communicated with the low-temperature fixed die cavity are fixedly arranged on the sealing plate.
The low Wen Dingmo cavity is surrounded by a fixed mold tray and a sealing plate, the lower part of the low-temperature fixed mold cavity is filled with filling liquid 7 for freezing the fixed depth measuring rod, and the upper part of the low-temperature fixed mold cavity is communicated with the conveying pipe and is filled with a low-temperature medium.
The filling liquid is water; the low-temperature medium is liquid nitrogen.
And the normal pressure taking die cavity is surrounded by a vacuum sleeve film and a fixed die tray, wherein the periphery of the vacuum sleeve film is closely attached to the circumferential inner wall of the tank body, and the bottom of the vacuum sleeve film supports the bottom end of the depth measuring rod in an irregular wave shape on the upper surface of the grain pile to be detected.
The negative pressure grain cavity is surrounded by the inner wall of the lower part of the tank body and the vacuum sleeve film, and the vacuum pipe 4 communicated with the negative pressure grain cavity is fixedly arranged on the tank body; one end of the vacuum tube facing the negative pressure grain cavity is fixedly provided with a grate 10.
Moreover, a graduated scale is manufactured on the circumferential outer wall of the depth measuring rod, and a sensor 9 is fixedly arranged at the bottom end of the depth measuring rod.
Moreover, a discharge hole 11 is formed in the bottom of the sealing tank.
A detection method of a grain quantity detection device based on grain pile form change comprises the following steps:
step 1, filling grains into the lower part of a tank body, and covering the top surface of a grain pile with a vacuum tube to form a negative pressure grain cavity; meanwhile, controlling the wave form of the upper surface of the grain pile according to the detection requirement;
step 2, sleeving a vacuum coating film in the tank body, wherein a redundant part is reserved at the bottom of the vacuum coating film to adapt to the upper surface form of the grain pile, and the top opening of the vacuum coating film is lapped at the top opening of the tank body;
step 3, inserting a fixed mould tray inserted with a depth measuring rod into the tank body from the top opening, sealing and clamping a vacuum sleeve film by matching with the sealing plate and the opening of the tank body, and enabling the bottom end of the depth measuring rod to be attached to the vacuum sleeve film on the upper surface of the grain pile under the driving of self gravity;
step 4, air at grain gaps in the negative pressure grain cavity is pumped out from the vacuum tube, the gap amount of the grain particles pressed in the large grain pile is regulated and simulated according to the magnitude of the negative pressure, and meanwhile, the vacuum coating film is tightly attached to the upper surface of the grain pile;
step 5, filling liquid is injected into the low-temperature fixed die cavity through a conveying pipe, and then a low-temperature medium is injected into the low-temperature fixed die cavity through the conveying pipe to freeze the filling liquid, so that a depth measuring rod is fixed on the fixed die tray;
step 6, integrally disassembling the fixed die tray, wherein a plurality of depth measuring rods are frozen and fixed on the fixed die tray, and manually recording graduated scale data of the downward detection depth of the depth measuring rods, or acquiring the downward detection depth data of the depth measuring rods and waveform data of the surface of the grain pile by a sensor, so as to calculate the initial total volume of the grain pile in the tank body and record the initial total volume as initial data of the grain pile shape;
step 7, a discharge hole at the bottom of the sealed tank is opened, a small amount of grains which are used for calibration and need to be counted are leaked, the steps 1 to 6 are repeated, the secondary total volume of the grain pile in the tank is calculated, and secondary data of the grain pile form is recorded;
step 8, verifying the relation between the grain pile form change including waveform and depth and the grain quantity by combining the grain quantity leaked in the step 7 according to the grain pile total volume difference value obtained in the step 6 and the step 7, and performing measurement calibration under the same negative pressure condition, namely under the same grain density condition;
step 9, actually measuring, repeating the steps 1 to 7, and measuring and calculating the actually leaked grain quantity by the total volume difference of the grain piles in the step 8 when grains with unknown quantity are leaked from the discharge hole in the step 7.
In addition, the sensor is preferably a mature product in the prior art, and the sensors at the bottom ends of the depth measuring rods jointly form a sensor array by adopting a mature technical means in the prior art so as to perform contact measurement and modeling on the concave-convex surface of the grain pile.
In order to more clearly describe the specific embodiments of the present invention, an example is provided below:
according to the grain quantity detection device based on grain pile form change, a plurality of fixed mould trays with depth measuring rods can be arranged in a liner replacement mode in the inspection process, and filling and liquefying without waiting for freezing in the process of multi-sampling modeling; and after the filling liquid is filled into the low-temperature fixed die cavity, the liquid level height of the filling liquid is not higher than the top height of the depth measuring rod which is attached to the surface of the grain pile, so that the problem that the axial gravity stress of the depth measuring rod is damaged and uncontrollable axial displacement of the depth measuring rod is caused by the fact that the filling liquid applies axial force to the end face of the depth measuring rod due to the frost heaving principle is avoided.
According to the detection method of the grain quantity detection device based on grain pile form change, in the process of carrying out step 1 or step 7, the form of the grain pile surface can be simulated according to requirements, as shown in fig. 4, and various surface forms which are not suitable for image acquisition modeling, such as local protrusions and local depressions, are included. Particularly, in the process of carrying out the step 7, the grain particles can be leaked out by selectively opening the discharge hole, so that vortex-shaped conical depressions are formed in the middle of the surface of the grain pile, and the step 7 is equivalent to subtracting the grain pile volume with the fixed particle quantity from the initial grain pile total volume; and in the same way, in the step 7, the volume of the grain pile with a fixed number of grains can be increased on the total volume of the initial grain pile, for example, new grains which are piled up to form mountain-shaped bulges are filled at any position on the upper surface of the grain pile.
In summary, in the detection method of the invention, measurement and calibration under the conditions of same grain species and same gap density are carried out in the steps 1 to 8, wherein the calibration quantity is the difference value between the initial grain pile volume in the step 6 and the secondary grain pile volume in the step 7, and the proportional relation between the difference value and the grain particle quantity; therefore, no matter whether the grain volume is increased or reduced in the step 7, and no matter what change happens to the upper surface morphology of the grain pile, the proportion relation is not influenced, so that the problems that in the process of acquiring and modeling the upper surface morphology image of the grain pile in the prior art, the acquisition difficulty of the surface morphology of the grain pile is high and the modeling accuracy of the grain pile is high because the surface model of the grain pile cannot be accurately constructed by a method for shooting the image are solved.
Finally, the inexhaustible points of the invention adopt mature products and mature technical means in the prior art.
In the description of the present specification, the descriptions of the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in the embodiments or examples of the present invention.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. Grain quantity detection device based on grain heap morphological change, its characterized in that: the device comprises a sealing tank which is vertically arranged and is used for containing a grain pile to be detected, wherein a fixed die tray is axially and limitedly overlapped at the upper part of the sealing tank, and a vacuum sleeve film is hermetically clamped at an overlapping gap between the sealing tank and the fixed die tray; the vacuum sleeve film is of a pocket-shaped structure with an opening at the top and a blocking bottom, the bottom surface of the vacuum sleeve film is sealed and attached to the top surface of the grain pile to be detected, and the vacuum sleeve film and the fixed die tray divide the inside of the sealed tank into a low-temperature fixed die cavity, a normal-pressure taking die cavity and a negative-pressure grain cavity which are sequentially arranged from top to bottom; filling a grain pile to be detected in the negative pressure grain cavity in a negative pressure tight mode, wherein the irregular top surface of the grain pile to be detected is sealed and attached by a vacuum sleeve film; the bottom surface of the fixed die tray vertically penetrates through the fixed die tray and is connected with a plurality of depth measuring rods with equal length in a sliding sealing mode, the top ends of the depth measuring rods upwards extend to the low-temperature fixed die cavity for low-temperature setting, and the bottom ends of the depth measuring rods downwards extend to the normal-pressure die taking cavity and are attached and supported by a vacuum sleeve film on the top surface of the grain pile to be detected.
2. The grain quantity detection device based on grain pile morphological change according to claim 1, wherein: the sealing tank comprises a tank body and a sealing plate, wherein the top of the tank body is opened and fixedly plugged and connected with the sealing plate, and the tank body and the sealing plate are matched with an axial sealing clamping fixed die tray and a vacuum film; and a plurality of conveying pipes communicated with the low-temperature fixed die cavity are fixedly arranged on the sealing plate.
3. The grain quantity detection apparatus based on grain pile morphology change according to claim 1 or 2, characterized in that: the low Wen Dingmo cavity is formed by enclosing a fixed die tray and a sealing plate, the lower part of the low-temperature fixed die cavity is filled with filling liquid for freezing the fixed depth measuring rod, and the upper part of the low-temperature fixed die cavity is communicated with the conveying pipe and is filled with a low-temperature medium.
4. The grain quantity detection device based on grain pile morphological change according to claim 3, wherein: the filling liquid is water; the low-temperature medium is liquid nitrogen.
5. The grain quantity detection device based on grain pile morphological change according to claim 2, characterized in that: the normal pressure taking die cavity is formed by enclosing a vacuum sleeve film and a fixed die tray, wherein the periphery of the vacuum sleeve film is tightly attached to the circumferential inner wall of the tank body, and the bottom of the vacuum sleeve film supports the bottom end of the depth measuring rod in an irregular wave form on the upper surface of the grain pile to be detected.
6. The grain quantity detection device based on grain pile morphological change according to claim 2, characterized in that: the negative pressure grain cavity is surrounded by the inner wall of the lower part of the tank body and the vacuum sleeve film, and a vacuum pipe communicated with the negative pressure grain cavity is fixedly arranged on the tank body; and one end of the vacuum tube, which faces the negative pressure grain cavity, is fixedly provided with a grate.
7. The grain quantity detection device based on grain pile morphological change according to claim 1, wherein: and a graduated scale is manufactured on the circumferential outer wall of the depth measuring rod, and a sensor is fixedly arranged at the bottom end of the depth measuring rod.
8. The grain quantity detection device based on grain pile morphological change according to claim 1, wherein: and a discharge hole is formed in the bottom of the sealing tank.
9. The method for detecting a grain quantity detecting device based on a change in morphology of a grain pile according to claim 1, comprising the steps of:
step 1, filling grains into the lower part of a tank body, and covering the top surface of a grain pile with a vacuum tube to form a negative pressure grain cavity; meanwhile, controlling the wave form of the upper surface of the grain pile according to the detection requirement;
step 2, sleeving a vacuum coating film in the tank body, wherein a redundant part is reserved at the bottom of the vacuum coating film to adapt to the upper surface form of the grain pile, and the top opening of the vacuum coating film is lapped at the top opening of the tank body;
step 3, inserting a fixed mould tray inserted with a depth measuring rod into the tank body from the top opening, sealing and clamping a vacuum sleeve film by matching with the sealing plate and the opening of the tank body, and enabling the bottom end of the depth measuring rod to be attached to the vacuum sleeve film on the upper surface of the grain pile under the driving of self gravity;
step 4, air at grain gaps in the negative pressure grain cavity is pumped out from the vacuum tube, the gap amount of the grain particles pressed in the large grain pile is regulated and simulated according to the magnitude of the negative pressure, and meanwhile, the vacuum coating film is tightly attached to the upper surface of the grain pile;
step 5, filling liquid is injected into the low-temperature fixed die cavity through a conveying pipe, and then a low-temperature medium is injected into the low-temperature fixed die cavity through the conveying pipe to freeze the filling liquid, so that a depth measuring rod is fixed on the fixed die tray;
step 6, integrally disassembling the fixed die tray, wherein a plurality of depth measuring rods are frozen and fixed on the fixed die tray, and manually recording graduated scale data of the downward detection depth of the depth measuring rods, or acquiring the downward detection depth data of the depth measuring rods and waveform data of the surface of the grain pile by a sensor, so as to calculate the initial total volume of the grain pile in the tank body and record the initial total volume as initial data of the grain pile shape;
step 7, a discharge hole at the bottom of the sealed tank is opened, a small amount of grains which are used for calibration and need to be counted are leaked, the steps 1 to 6 are repeated, the secondary total volume of the grain pile in the tank is calculated, and secondary data of the grain pile form is recorded;
step 8, verifying the relation between the grain pile form change including waveform and depth and the grain quantity by combining the grain quantity leaked in the step 7 according to the grain pile total volume difference value obtained in the step 6 and the step 7, and performing measurement calibration under the same negative pressure condition, namely under the same grain density condition;
step 9, actually measuring, repeating the steps 1 to 7, and measuring and calculating the actually leaked grain quantity by the total volume difference of the grain piles in the step 8 when grains with unknown quantity are leaked from the discharge hole in the step 7.
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