CN111649986A - Fixed-point sampling coal sample granularity automatic sorting device and using method - Google Patents
Fixed-point sampling coal sample granularity automatic sorting device and using method Download PDFInfo
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- CN111649986A CN111649986A CN202010531344.0A CN202010531344A CN111649986A CN 111649986 A CN111649986 A CN 111649986A CN 202010531344 A CN202010531344 A CN 202010531344A CN 111649986 A CN111649986 A CN 111649986A
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- 239000003245 coal Substances 0.000 title claims abstract description 74
- 238000005070 sampling Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000000926 separation method Methods 0.000 claims abstract 2
- 235000019580 granularity Nutrition 0.000 claims description 26
- 210000003205 muscle Anatomy 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000012216 screening Methods 0.000 abstract description 13
- 239000004744 fabric Substances 0.000 abstract description 9
- 238000011161 development Methods 0.000 abstract description 5
- 238000005553 drilling Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/08—Screens rotating within their own plane
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
- B07B1/4663—Multi-layer screening surfaces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B2201/00—Details applicable to machines for screening using sieves or gratings
- B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N2001/1087—Categories of sampling
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- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Hydrology & Water Resources (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a fixed-point sampling coal sample granularity automatic sorting device which comprises an outer shell, a rotating frame assembly arranged at the bottom of the outer shell and an inner cylinder assembly arranged on the rotating frame assembly; the inner tube subassembly sets up the rotatory inner tube on the swivel mount subassembly including rotating, set up in the fan blade on rotatory inner tube top and set up a plurality of coal sample screen cloth in rotatory inner tube, when this technical scheme's automatic separation device can be used to the sampling of double-walled drilling rod, carry out the automatic screening of granularity to gathering the coal sample, the flow of artificially screening the coal sample in having simplified the parameter determination process, the stability of operating process time has been ensured, the accuracy and the stability of parameter determination result have been improved, accord with the development direction of automation, intelligent mine.
Description
Technical Field
The invention relates to the field of coal sample sorting, in particular to a fixed-point sampling coal sample granularity automatic sorting device and a using method thereof.
Background
In the production process of a mine, a large number of basic parameters of a coal bed are required to be measured to assist the safe production of the coal mine, such as the gas content of the coal bed and the gas desorption index K of drill cuttings1The values, delta h2 and the like are measured, coal sample collection and coal sample granularity screening work needs to be carried out on site when the parameters are measured, currently, measurement personnel generally use coal sample sieves with different granularities to carry out screening when the granularity of the coal samples collected on site is sorted, manual operation may cause that the time required by the screening process is greatly different, the measured index value of the same coal sample is different, and certain influence is caused on the accuracy of the index measurement result, and meanwhile, manual screening of the coal samples consumes a great deal of experience of the site test personnel, which is not consistent with the development direction of automation and intellectualization of coal mines in China.
Therefore, a novel coal sample granularity automatic sorting device matched with a double-wall fixed-point sampling drill rod for coal sample collection and a using method are needed, the operation process of underground parameter measuring personnel is simplified, the automatic sorting of the coal sample is realized in the coal sample collection and measurement process, and the coal sample granularity automatic sorting device accords with the development direction of an automatic and intelligent mine and is used for fixed-point sampling.
Disclosure of Invention
In view of the above, the present invention provides an automatic coal sample granularity sorting apparatus for coal seam drilling fixed point sampling and a use method thereof, which are used for realizing an automatic granularity sorting function for a coal sample when a double-wall fixed point sampling drill rod is used for drilling and sampling, and are helpful for quickly and accurately measuring basic parameters of a coal seam.
A fixed-point sampling coal sample granularity automatic sorting device comprises an outer shell, a rotating frame assembly arranged at the bottom of the outer shell and an inner cylinder assembly arranged on the rotating frame assembly; the inner cylinder subassembly sets up the rotatory inner tube on the swivel mount subassembly including rotating, sets up in the wind vane at rotatory inner tube top and sets up a plurality of coal sample screens in rotatory inner tube.
Further, the cross section of the rotating inner cylinder is integrally in an isosceles trapezoid shape, a plurality of vertical convex ribs are arranged on the inner wall of the rotating inner cylinder, and the vertical convex ribs are evenly arranged on the inner wall of the rotating inner cylinder along the circumferential direction of the rotating inner cylinder.
Furthermore, every vertical protruding muscle is inwards all protruding formation horizontal spacing fixture block along rotatory inner tube radial direction, horizontal spacing fixture block is polylith and horizontal spacing fixture block even interval arrangement on vertical protruding muscle.
Furthermore, the number of the vertical convex ribs is four, and four transverse limiting clamping blocks are formed on each vertical convex rib.
Further, evenly be provided with a plurality of meshes on the coal sample screen cloth, coal sample screen cloth circumferential direction evenly is provided with a plurality of spacing bayonets.
Further, spacing bayonet socket is four, rotatory inner tube bottom is provided with the screen bottom, the fan blade is a plurality of and a plurality of fan blade and rotates and set up in rotatory inner tube top, the fan blade is the arc structure.
Further, the rotating frame assembly comprises an installation base fixedly arranged at the bottom in the outer shell, a support connecting rod arranged on the installation base and a bearing assembly arranged at the end part of the support connecting rod, wherein the bearing assembly is fixedly arranged at the bottom end outside the rotating inner cylinder and is arranged in a manner of being matched with the support connecting rod in a rotating manner.
Furthermore, a plurality of limiting support rods are arranged at the bottom of the rotary inner cylinder, and springs are mounted on the limiting support rods.
Furthermore, a plurality of positioning supports which can stretch out and draw back along the vertical direction are arranged on the outer shell.
Further sorting with a device comprising the steps of:
s1: adjusting the positioning support, installing and placing the device at a specified position, and conveying a coal sample to be sorted to the rotary inner cylinder;
s2: the wind blades arranged on the rotatable inner cylinder are driven to rotate, so that the rotatable inner cylinder is driven to rotate ceaselessly, the coal sample moves on the ceaselessly rotating screen, and the coal sample with the particle size smaller than the aperture of the mesh hole of the screen falls into the next layer of screen;
s3: and after the coal sample sampling is finished, stopping rotating the automatic sorting device, and taking out the coal samples with different granularities of the screen and the screen bottom.
The invention has the beneficial effects that:
the technical scheme can be used for automatically screening the granularity of the collected coal sample when the double-wall drill rod is used for sampling, simplifies the manual process of screening the coal sample in the parameter measurement process, ensures the stability of the time of the operation process, improves the accuracy and the stability of the parameter measurement result, and accords with the development direction of an automatic and intelligent mine.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a screen panel according to the present invention;
FIG. 3 is a side view of a wind blade of the present invention;
FIG. 4 is a top view of a wind blade of the present invention.
Detailed Description
FIG. 1 is a schematic structural view of the present invention; FIG. 2 is a schematic diagram of a screen panel according to the present invention; FIG. 3 is a side view of a wind blade of the present invention; FIG. 4 is a top view of a wind blade of the present invention; as shown in the figure, the automatic sorting device for the fixed-point sampling coal sample granularity comprises an outer shell 2, a rotating frame assembly arranged at the bottom of the outer shell 2 and an inner cylinder assembly arranged on the rotating frame assembly; the inner cylinder subassembly sets up rotatory inner tube 3 on the swivel mount subassembly including rotating, sets up in the fan blade 4 on rotatory inner tube 3 top and sets up a plurality of coal sample screen cloth 6 in rotatory inner tube 3. The technical scheme can be used for automatically screening the granularity of the collected coal sample when the double-wall drill rod is used for sampling, simplifies the manual process of screening the coal sample in the parameter measurement process, ensures the stability of the time of the operation process, improves the accuracy and the stability of the parameter measurement result, and accords with the development direction of an automatic and intelligent mine.
In this embodiment, 3 sections of rotatory inner tube wholly are "isosceles trapezoid", be provided with many vertical protruding muscle 5 on 3 inner walls of rotatory inner tube, vertical protruding muscle 5 evenly arranges on 3 inner walls of rotatory inner tube along rotatory inner tube circumferential direction. The axial direction is vertical direction in fig. 1, the rotary inner cylinder 3 is convenient for realizing the function of layer-by-layer screening, the vertical convex rib 5 is a certain included angle with the vertical direction as shown in fig. 1, and the protrusion is arranged on the inner wall of the rotary inner cylinder 3, so that the screen 6 is convenient to install.
In this embodiment, every vertical protruding muscle 5 is inwards all protruding formation horizontal spacing fixture block 7 along 3 radial directions of rotatory inner tube, horizontal spacing fixture block 7 is polylith and the even interval arrangement of horizontal spacing fixture block on vertical protruding muscle. Horizontal spacing fixture block 7 evenly sets up on every vertical protruding muscle 5, and horizontal spacing fixture block 7 on same horizontal plane provides stable support limiting displacement for installing screen cloth 6.
In this embodiment, the vertical ribs 5 are four, and four horizontal limiting clamping blocks 7 are formed on each vertical rib 5. Vertical protruding muscle 5 is four installation screen cloth 6 of being convenient for provide four installation spacing positions, sets up a plurality of horizontal spacing fixture blocks 7 on same vertical protruding muscle 5 and is convenient for install multilayer screen cloth 6, realizes the layering screening.
In this embodiment, evenly be provided with a plurality of meshes 62 on the coal sample screen cloth 6, coal sample screen cloth 6 circumferential direction evenly is provided with a plurality of spacing bayonets 61. The number of the limiting bayonets 61 is four, the bottom of the rotary inner barrel 3 is provided with a screen bottom 8, the wind blades 4 are a plurality of wind blades 4, the wind blades are arranged at the top end of the rotary inner barrel in a rotating mode, and the wind blades are of arc-shaped structures.
In this embodiment, the rotating frame assembly includes an installation base 12 fixedly disposed at the bottom in the outer shell 2, a support connecting rod 11 disposed on the installation base 12, and a bearing assembly disposed at an end of the support connecting rod 11, wherein the bearing assembly is fixedly disposed at the outer bottom of the rotating inner cylinder 3 and is disposed in a manner of being rotationally matched with the support connecting rod. The support connecting rod 11 is arranged on the installation base 12, so that the rotary inner cylinder 3 can rotate around the support connecting rod 11, and the screening of the coal briquettes is convenient to realize.
In this embodiment, the bottom of the rotary inner cylinder 3 is provided with a plurality of limit support rods, and the limit support rods are provided with springs 9. The spring 9 on the limiting support rod prevents the bottom of the inner cylinder from colliding with the bottom of the outer shell 2 when the rotating inner cylinder 3 rotates, and safety performance is improved.
In this embodiment, the outer casing 2 is provided with a plurality of positioning brackets 1 which can be extended and retracted in the vertical direction. The positioning bracket 1 can be freely stretched and retracted and is used for adjusting the overall height.
In this embodiment, the sorting by the apparatus includes the following steps:
s1: adjusting the positioning support 1, installing and placing the device at a specified position, and conveying a coal sample to be sorted to the rotary inner cylinder 3; when a double-wall drill rod is adopted to collect coal samples at fixed points, the coal samples returned from the hole bottom after being cut by a drill bit and compressed air are output to an orifice from an inner tube of the double-wall drill rod, and the coal samples discharged from the inner tube of the drill rod are conveyed into a rotary inner tube 3 of a sorting device in a drainage manner by adjusting a tripod support 1;
s2: the wind blades 4 arranged on the rotary inner cylinder 3 are driven to rotate, so that the rotary inner cylinder 4 is driven to rotate ceaselessly, the coal sample moves on the ceaselessly rotating screen, and the coal sample with the particle size smaller than the aperture of the mesh hole of the screen falls into the screen of the next layer; the compressed air discharged from the inner pipe of the double-wall drill pipe is used as power to drive the wind blade 4 structure arranged on the rotatable inner cylinder 3, so that the rotatable inner cylinder 3 of the sorting device is driven to rotate ceaselessly, the coal sample moves on the screen 5 which rotates ceaselessly, the coal sample with the particle size smaller than the mesh aperture of the screen mesh can fall into the screen mesh of the next layer, and the like, so that the automatic sorting of the collected coal sample in the sorting device according to the mesh size is realized.
S3: and after the coal sample sampling is finished, stopping rotating the automatic sorting device, and taking out the coal samples with different granularities of the screen and the screen bottom.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. The utility model provides a fixed point sampling coal sample granularity automatic separation device which characterized in that: comprises an outer shell, a rotating frame component arranged at the bottom of the outer shell and an inner cylinder component arranged on the rotating frame component; the inner cylinder subassembly sets up the rotatory inner tube on the swivel mount subassembly including rotating, sets up in the wind vane at rotatory inner tube top and sets up a plurality of coal sample screens in rotatory inner tube.
2. The fixed-point sampling coal sample granularity automatic sorting device according to claim 1, characterized in that: the rotary inner cylinder is integrally isosceles trapezoid in cross section, a plurality of vertical convex ribs are arranged on the inner wall of the rotary inner cylinder, and the vertical convex ribs are evenly arranged on the inner wall of the rotary inner cylinder along the circumferential direction of the rotary inner cylinder.
3. The fixed-point sampling coal sample granularity automatic sorting device according to claim 2, characterized in that: every vertical protruding muscle is inwards all protruding formation horizontal spacing fixture block along rotatory inner tube radial direction, horizontal spacing fixture block is polylith and horizontal spacing fixture block even interval arrangement on vertical protruding muscle.
4. The fixed-point sampling coal sample granularity automatic sorting device according to claim 3, characterized in that: the number of the vertical convex ribs is four, and four transverse limiting clamping blocks are formed on each vertical convex rib.
5. The fixed-point sampling coal sample granularity automatic sorting device according to claim 4, characterized in that: a plurality of meshes are uniformly arranged on the coal sample screen, and a plurality of limiting bayonets are uniformly arranged in the circumferential direction of the coal sample screen.
6. The fixed-point sampling coal sample granularity automatic sorting device according to claim 5, characterized in that: the limiting bayonets are four, the bottom of the rotary inner barrel is provided with a screen bottom, the wind blades are a plurality of wind blades and are arranged at the top end of the rotary inner barrel in a rotating mode, and the wind blades are of arc-shaped structures.
7. The fixed-point sampling coal sample granularity automatic sorting device of claim 6, characterized in that: the rotating frame assembly comprises an installation base fixedly arranged at the bottom in the outer shell, a support connecting rod arranged on the installation base and a bearing assembly arranged at the end part of the support connecting rod, wherein the bearing assembly is fixedly arranged at the bottom end outside the rotating inner cylinder and is arranged in a manner of being matched with the support connecting rod in a rotating manner.
8. The fixed-point sampling coal sample granularity automatic sorting device according to claim 7, characterized in that: the bottom of the rotary inner cylinder is provided with a plurality of limiting support rods, and springs are mounted on the limiting support rods.
9. The fixed-point sampling coal sample granularity automatic sorting device according to claim 8, characterized in that: the shell body is provided with a plurality of positioning supports which can stretch out and draw back along the vertical direction.
10. The use method of the automatic fixed-point sampling coal sample granularity sorting device is characterized in that the device of claim 9 is used for sorting, and comprises the following steps:
s1: adjusting the positioning support, installing and placing the device at a specified position, and conveying a coal sample to be sorted to the rotary inner cylinder;
s2: the wind blades arranged on the rotary inner cylinder are driven to rotate, so that the rotary inner cylinder is driven to rotate ceaselessly, the coal sample moves on the ceaselessly rotating screen, and the coal sample with the particle size smaller than the aperture of the mesh hole of the screen falls into the next layer of screen;
s3: and after the coal sample sampling is finished, stopping rotating the automatic sorting device, and taking out the coal samples with different granularities of the screen and the screen bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010531344.0A CN111649986A (en) | 2020-06-11 | 2020-06-11 | Fixed-point sampling coal sample granularity automatic sorting device and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010531344.0A CN111649986A (en) | 2020-06-11 | 2020-06-11 | Fixed-point sampling coal sample granularity automatic sorting device and using method |
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| Publication Number | Publication Date |
|---|---|
| CN111649986A true CN111649986A (en) | 2020-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010531344.0A Pending CN111649986A (en) | 2020-06-11 | 2020-06-11 | Fixed-point sampling coal sample granularity automatic sorting device and using method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1190174A (en) * | 1968-11-12 | 1970-04-29 | Kalker Trieurfabrik Fabr | Improvements in or relating to Multi-Stage Screening Machines |
| US20020189994A1 (en) * | 2000-02-19 | 2002-12-19 | Voith Paper Patent Gmbh | Screen for fiber suspensions and method for the manufacture thereof |
| CN207204597U (en) * | 2017-08-11 | 2018-04-10 | 安徽屹翔滤材有限公司 | A kind of adjustable colliery screen supporting device |
| CN207238461U (en) * | 2017-09-18 | 2018-04-17 | 新疆喜润农业科技有限公司 | Rotary two level screen-dividing machine |
| CN108889592A (en) * | 2018-07-06 | 2018-11-27 | 安徽机电职业技术学院 | A kind of novel sandstone screening installation |
| CN110102401A (en) * | 2019-05-08 | 2019-08-09 | 安徽理工大学 | A kind of differential speed rotation wet screening instrument |
| CN110404753A (en) * | 2019-09-02 | 2019-11-05 | 安徽家思特涂料有限责任公司 | A kind of high-effective classifying screening plant |
| CN110434047A (en) * | 2019-06-28 | 2019-11-12 | 天津农学院 | A kind of rotary screen barrel type screen grader for realizing earthworm and excrement separation |
-
2020
- 2020-06-11 CN CN202010531344.0A patent/CN111649986A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1190174A (en) * | 1968-11-12 | 1970-04-29 | Kalker Trieurfabrik Fabr | Improvements in or relating to Multi-Stage Screening Machines |
| US20020189994A1 (en) * | 2000-02-19 | 2002-12-19 | Voith Paper Patent Gmbh | Screen for fiber suspensions and method for the manufacture thereof |
| CN207204597U (en) * | 2017-08-11 | 2018-04-10 | 安徽屹翔滤材有限公司 | A kind of adjustable colliery screen supporting device |
| CN207238461U (en) * | 2017-09-18 | 2018-04-17 | 新疆喜润农业科技有限公司 | Rotary two level screen-dividing machine |
| CN108889592A (en) * | 2018-07-06 | 2018-11-27 | 安徽机电职业技术学院 | A kind of novel sandstone screening installation |
| CN110102401A (en) * | 2019-05-08 | 2019-08-09 | 安徽理工大学 | A kind of differential speed rotation wet screening instrument |
| CN110434047A (en) * | 2019-06-28 | 2019-11-12 | 天津农学院 | A kind of rotary screen barrel type screen grader for realizing earthworm and excrement separation |
| CN110404753A (en) * | 2019-09-02 | 2019-11-05 | 安徽家思特涂料有限责任公司 | A kind of high-effective classifying screening plant |
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Application publication date: 20200911 |
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