CN110961201A - Planetary ball mill - Google Patents
Planetary ball mill Download PDFInfo
- Publication number
- CN110961201A CN110961201A CN201811143482.0A CN201811143482A CN110961201A CN 110961201 A CN110961201 A CN 110961201A CN 201811143482 A CN201811143482 A CN 201811143482A CN 110961201 A CN110961201 A CN 110961201A
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- Prior art keywords
- tank
- rod
- bottom plate
- ball mill
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000498 ball milling Methods 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 11
- 238000007790 scraping Methods 0.000 claims description 20
- 238000000227 grinding Methods 0.000 abstract description 14
- 238000009825 accumulation Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 238000003556 assay Methods 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 241000411851 herbal medicine Species 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000004482 other powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/04—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
- B02C17/08—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container with containers performing a planetary movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/0804—Cleaning containers having tubular shape, e.g. casks, barrels, drums
- B08B9/0808—Cleaning containers having tubular shape, e.g. casks, barrels, drums by methods involving the use of tools, e.g. by brushes, scrapers
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention provides a planetary ball mill, in particular to the technical field of crushing equipment, which comprises a ball mill body, wherein a rotary table is arranged on the ball mill body, a plurality of ball milling tanks are arranged on the rotary table, each ball milling tank comprises a tank seat and a tank body, the tank seat comprises a tank seat bottom plate, the tank seat bottom plate is arranged on the rotary table, the tank seat bottom plate is of a circular ring-shaped structure with an open top surface, a tank side plate is also oppositely arranged on the open top surface of the tank seat bottom plate, the tank side plate is of an arc-shaped plate-shaped structure, one end of the tank side plate is fixedly arranged on the open top surface of the tank seat bottom plate, the other end of the tank side plate is also provided with a clamping plate notch, an external threaded rod is also vertically arranged on the tank seat bottom plate, one end of the. The invention has the advantages that the grinding effect can be prevented from being reduced due to the accumulation of the sample on the inner wall of the bottom of the tank body, the pressure between the scraper and the inner wall of the tank body can be automatically adjusted when the sample is scraped, the damage to the inner wall of the tank body is reduced, and the like.
Description
Technical Field
The invention relates to the technical field of crushing equipment, in particular to a planetary ball mill.
Background
The planetary ball mill is designed for crushing, grinding and dispersing metal, nonmetal, organic, Chinese herbal medicine and other powder, is especially suitable for laboratory research and use, and has the working principle that the grinding material and a sample roll at high speed in a grinding tank to generate strong shearing, impact and rolling on materials so as to achieve the purposes of crushing, grinding, dispersing and emulsifying the materials. As a result of the planetary motion, the motion tracks of the materials and the grinding balls in the ball milling tank are disordered, and the materials and the grinding balls and the walls of the ball milling tank are impacted and ground at high speed, so that the granularity of the materials is finer and finer. However, in practice, it is found that many materials in the ball milling tank are adhered to the bottom of the ball milling tank and the tank wall after being milled to a certain fineness, and are agglomerated into blocks, and the larger the block is, the larger the agglomeration is, so that the milling balls and the agglomerated materials cannot be milled, and the ball milling effect is influenced.
Disclosure of Invention
The invention provides a planetary ball mill which can prevent the reduction of grinding effect caused by the accumulation of a sample on the inner wall of the bottom of a tank body, and can automatically adjust the pressure between a scraper and the inner wall of the tank body when scraping the sample so as to reduce the damage to the inner wall of the tank body.
In order to solve the technical problems, the invention provides a planetary ball mill, which comprises a ball mill body, wherein a rotary table is arranged on the ball mill body, a plurality of ball milling tanks are arranged on the rotary table, each ball milling tank comprises a tank seat and a tank body, the tank seat comprises a tank seat bottom plate, the tank seat bottom plate is arranged on the rotary table, the tank seat bottom plate is of a circular ring-shaped structure with an open top surface, a tank side plate is also oppositely arranged on the opening of the top surface of the tank seat bottom plate, the tank side plate is of an arc-shaped plate-shaped structure, one end of the tank side plate is fixedly arranged on the opening of the top surface of the tank seat bottom plate, the other end of the tank side plate is also provided with a clamping plate notch, an external threaded rod is also vertically arranged on the tank seat bottom plate, one end of the external threaded rod penetrates through the tank seat bottom plate, one end of the external threaded rod is fixedly arranged on the rotary table, a scraping rod is also arranged on, the jar body is one end open-ended hollow cylinder structure, the open end of the jar body is towards the tank base bottom plate, and the open end setting of the jar body is in the top surface opening of tank base bottom plate, be provided with cylinder form sleeve pipe on the internal bottom surface of jar, cylinder form sheathed tube both ends are the opening form, and the spring is located cylinder form sheathed tube inside, the fixed clamping screw that is provided with on the external bottom surface of jar, the last activity of clamping screw is provided with the clamp plate, the shape at clamp plate both ends all cooperatees with the shape of cardboard breach, and the equal activity in both ends of clamp plate sets up in the cardboard breach, the last activity that still is provided with fixation.
Preferably, the scraping rod comprises a rod body, one end of the rod body is fixedly arranged on the side wall of one end of the outer threaded rod, the other end of the rod body is provided with a rod head groove, a rod head is movably arranged in the rod head groove, one end of the rod head is movably arranged in the rod head groove, a return spring is also arranged in the rod head groove, one end of the return spring is fixedly arranged in the rod head groove, the other end of the return spring is fixedly connected with one end of the rod head, the other end of the rod head is provided with a scraper, the scraper comprises a scraper seat, the scraper seat is of a rectangular structure, one end of the scraper seat is fixedly connected with the other end of the rod head, the other end of the scraper seat is also fixedly provided with a fan-shaped scraper head, when the rotary disc rotates, the external thread rod is driven by the shaft of the tank body to rotate in the direction opposite to the rotating direction of the rotary disc, and the fan-shaped scraper head can scrape off the sample adhered to the inner wall of the bottom of the tank body, so that the sample is prevented from being accumulated, and the grinding effect is reduced.
Preferably, the other end of scraping the blade holder is the arc shape structure, and fan-shaped scraper head is fan-shaped structure, and the fixed setting in the other end of scraping the blade holder in summit of fan-shaped scraper head, and the radian of fan-shaped scraper head cambered surface cooperatees with the radian of jar internal wall, and fan-shaped scraper head cambered surface contacts with jar internal wall, and fan-shaped scraper head can be better identical with jar internal wall of bottom, can strike off the assay of adhesion on jar internal wall of bottom, thereby prevents that the assay from piling up and reducing grinding effect.
Preferably, the height of the tank body is smaller than the distance from the lower end of the clamping plate notch to the tank base bottom plate, so that the tank body is conveniently fixed on the tank base bottom plate through the pressing plate.
Preferably, the distance from the scraping rod to the other end of the external thread rod is greater than the length of the cylindrical sleeve, the inner diameter of the cylindrical sleeve is greater than the outer diameter of the spring, the cylindrical sleeve is sleeved outside the external thread rod conveniently after the tank body is installed, and the opening surface of the tank body is not interfered with the scraping rod when the tank body rotates.
Preferably, the depth of the rod head groove is larger than the length of the rod head, when a sample adhered to the inner wall of the bottom of the tank body is too thick, the fan-shaped scraper head can automatically compress one end of the return spring rod head to adjust the length in the rod head groove when scraping the sample.
The invention has the advantages that:
(1) the scraper is arranged, and the fan-shaped scraper head is of a fan-shaped structure, so that the cambered surface of the fan-shaped scraper head can be better matched with the inner wall of the tank body, a test material adhered to the inner wall of the bottom of the tank body can be more easily scraped, and the test material is prevented from being accumulated, so that the grinding effect is reduced;
(2) the cylindrical sleeve is arranged on the bottom surface in the tank body, the spring is positioned in the cylindrical sleeve, and the cylindrical sleeve can block a test material and prevent the test material from entering a gap of the spring and interfering the expansion and contraction of the spring during working.
Drawings
FIG. 1 is a schematic structural diagram of a planetary ball mill according to the present invention;
FIG. 2 is a schematic diagram showing the positions of a ball milling pot and a turntable of a planetary ball mill according to the present invention;
FIG. 3 is a schematic diagram of the positions of the bowl base and the bowl body of the planetary ball mill according to the present invention;
FIG. 4 is a schematic view of a structure of a pot seat of a planetary ball mill according to the present invention;
FIG. 5 is a schematic diagram of the position of a cylindrical sleeve of a planetary ball mill according to the present invention;
FIG. 6 is a schematic diagram of a rod body position of a planetary ball mill according to the present invention;
FIG. 7 is a schematic diagram of a rod structure of a planetary ball mill according to the present invention;
labeled as: 1. a ball mill body; 2. a turntable; 3. a ball milling tank; 31. a tank base; 311. a tank base floor; 312. a tank side plate; 313. a pallet notch; 314. an externally threaded rod; 315. a spring; 316. adjusting the nut; 317. a scraping rod; 32. a tank body; 321. a cylindrical sleeve; 322. fixing the screw rod; 323. pressing a plate; 324. fixing a nut; 4. a rod body; 41. a rod head slot; 42. a club head; 43. a scraper; 431. a scraper seat; 432. a fan-shaped scraper head; 44. and a return spring.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in fig. 1-7, the planetary ball mill of the present invention comprises a ball mill body 1, a rotary table 2 is disposed on the ball mill body 1, a plurality of ball milling pots 3 are disposed on the rotary table 2, each ball milling pot 3 comprises a pot holder 31 and a pot body 32, the pot holder 31 comprises a pot holder bottom plate 311, the pot holder bottom plate 311 is disposed on the rotary table 2, the pot holder bottom plate 311 is a circular ring-shaped structure with an open top surface, a pot side plate 312 is oppositely disposed on the top surface opening of the pot holder bottom plate 311, the pot side plate 312 is an arc-shaped plate-shaped structure, one end of the pot side plate 312 is fixedly disposed on the top surface opening of the pot holder bottom plate 311, the other end of the pot side plate 312 is further provided with a clamping plate notch 313, an external screw rod 314 is vertically disposed on the pot holder bottom plate 311, one end of the external screw rod 314 passes through the pot holder bottom plate 311, one end of the external screw rod 314 is fixedly disposed on, an adjusting nut 316 is movably arranged at the other end of the external threaded rod 314, a spring 315 is sleeved on the external threaded rod 314 between the fixing nut 316 and the scraping rod 317, the tank body 32 is of a hollow cylinder structure with an open end, the open end of the tank body 32 faces the tank base bottom plate 311, the open end of the tank body 32 is arranged in the opening of the top surface of the tank base bottom plate 311, a cylindrical sleeve 321 is arranged on the bottom surface in the tank body 32, both ends of the cylindrical sleeve 321 are open, the spring 315 is positioned in the cylindrical sleeve 321, a fixing screw 322 is fixedly arranged on the bottom surface outside the tank body 32, a pressing plate 323 is movably arranged on the fixing screw 322, both ends of the pressing plate 323 are matched with the shape of the clamping plate gap 313, both ends of the pressing plate 323 are movably arranged in the clamping plate gap 313, and a fixing nut 324 is also movably arranged on the.
The scraping rod 317 comprises a rod body 4, one end of the rod body 4 is fixedly arranged on the side wall of one end of the outer threaded rod 314, the other end of the rod body 4 is provided with a rod head groove 41, a rod head 42 is movably arranged in the rod head groove 41, one end of the rod head 42 is movably arranged in the rod head groove 41, a return spring 44 is further arranged in the rod head groove 41, one end of the return spring 44 is fixedly arranged in the rod head groove 41, the other end of the return spring 44 is fixedly connected with one end of the rod head 42, the other end of the rod head 42 is provided with a scraper 43, the scraper 43 comprises a scraper seat 431, the scraper seat 431 is of a rectangular structure, one end of the scraper seat 431 is fixedly connected with the other end of the rod head 42, the other end of the scraper seat 431 is further fixedly provided with a fan-shaped scraper head 432, when the rotary table 2 rotates, the outer threaded rod 314 is driven by the shaft of the tank body 32 per se and, the sample accumulation is prevented, the grinding effect is reduced, the other end of the scraper seat 431 is of an arc-shaped structure, the fan-shaped scraper head 432 is of a fan-shaped structure, the vertex of the fan-shaped scraper head 432 is fixedly arranged at the other end of the scraper seat 431, the radian of the arc surface of the fan-shaped scraper head 432 is matched with the radian of the inner wall of the tank body 32, the arc surface of the fan-shaped scraper head 432 is in contact with the inner wall of the tank body 32, the fan-shaped scraper head 432 can be better matched with the inner wall at the bottom of the tank body 32, the sample adhered to the inner wall at the bottom of the tank body 32 can be scraped, the sample accumulation is prevented, the height of the tank body 32 is smaller than the distance from the lower end of the clamping plate notch 313 to the tank seat bottom plate 311, the tank body 32 is conveniently fixed on the tank seat bottom plate 311 through the pressing plate 323, the distance from, the cylindrical sleeve 321 is sleeved outside the external screw rod 314, so that the opening surface of the can body 32 does not interfere with the scraping rod 317 when the can body 32 rotates, the depth of the rod head groove 41 is larger than the length of the rod head 42, and when a sample adhered to the inner wall of the bottom of the can body 32 is too thick, the fan-shaped scraper head 432 can automatically compress one end of the rod head 42 of the return spring 44 to adjust the length in the rod head groove 41 when scraping the sample.
The working principle of the invention is as follows: firstly, the sample and the grinding ball are put into the tank body 32, so that two ends of the pressure plate 323 are clamped into the clamping plate gap 313, then the fixing nut 324 on the fixing screw rod 322 is screwed, the tank body 32 can be fixed on the tank base bottom plate 311, the rotating disc 2 drives the tank base 31 and the tank body 32 to rotate at high speed during the work, at the same time, the external screw rod 314 is driven by the shaft of the pot 32 itself to be opposite to the rotation direction of the turntable 2, the sample in the pot 32 and the grinding ball, and the sample and the inner wall of the pot 32 are collided with each other, so that the sample is more and more finely ground, the external screw rod 314 rotates to drive the scraper 43 to rotate, the arc surface of the fan-shaped scraper head 432 is contacted with the inner wall of the tank 32, therefore, the fan-shaped scraper head 432 can scrape off the sample adhered to the inner wall of the bottom of the can 32 and prevent the sample from being accumulated, and the position of the fixing nut 316 on the external screw rod 314 is adjusted to compress the spring 315 and prevent the sample from being blocked in the gap of the spring 315.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A planetary ball mill is characterized in that: comprises a ball mill body (1), a turntable (2) is arranged on the ball mill body (1), a plurality of ball milling tanks (3) are arranged on the turntable (2), each ball milling tank (3) comprises a tank seat (31) and a tank body (32), each tank seat (31) comprises a tank seat bottom plate (311), each tank seat bottom plate (311) is arranged on the turntable (2), each tank seat bottom plate (311) is of a circular ring-shaped structure with an open top surface, each tank seat bottom plate (311) is also oppositely provided with a tank side plate (312) on an opening on the top surface, each tank side plate (312) is of an arc plate-shaped structure, one end of each tank side plate (312) is fixedly arranged on the opening on the top surface of each tank seat bottom plate (311), the other end of each tank side plate (312) is also provided with a clamping plate notch (313), each tank seat bottom plate (311) is also vertically provided with an external threaded rod (314), one end of each external threaded rod (314) penetrates through each tank seat bottom plate (311), a scraping rod (317) is further arranged on the side wall of one end of the external threaded rod (314), an adjusting nut (316) is movably arranged at the other end of the external threaded rod (314), a spring (315) is sleeved on the external threaded rod (314) between the fixing nut (316) and the scraping rod (317), the tank body (32) is of a hollow cylindrical structure with one open end, the open end of the tank body (32) faces the tank base bottom plate (311), the open end of the tank body (32) is arranged in the opening of the top surface of the tank base bottom plate (311), a cylindrical sleeve (321) is arranged on the bottom surface in the tank body (32), both ends of the cylindrical sleeve (321) are open, the spring (315) is positioned in the cylindrical sleeve (321), a fixing screw rod (322) is fixedly arranged on the bottom surface outside the tank body (32), a pressing plate (323) is movably arranged on the fixing screw rod (322), the shapes of both ends of the pressing plate (323) are matched with the shape of the, and both ends of the pressure plate (323) are movably arranged in the clamping plate gap (313), and the fixed screw (322) is also movably provided with a fixed nut (324).
2. The planetary ball mill according to claim 1, characterized in that: the scraping rod (317) comprises a rod body (4), one end of the rod body (4) is fixedly arranged on the side wall of one end of the outer threaded rod (314), the other end of the rod body (4) is provided with a rod head groove (41), a rod head (42) is movably arranged in the rod head groove (41), and the one end activity of pole head (42) sets up in pole head groove (41), still be provided with return spring (44) in pole head groove (41), the fixed setting in pole head groove (41) of one end of return spring (44), the other end of return spring (44) and the one end fixed connection of pole head (42), the other end of pole head (42) is provided with scraper (43), scraper (43) are including scraping blade holder (431), it is rectangular structure to scrape blade holder (431), fixed connection between the one end of scraping blade holder (431) and the other end of pole head (42), the other end of scraping blade holder (431) still fixedly is provided with fan-shaped scraper head (432).
3. The planetary ball mill according to claim 2, characterized in that: the other end of the scraper seat (431) is of an arc-shaped structure, the fan-shaped scraper head (432) is of a fan-shaped structure, the top point of the fan-shaped scraper head (432) is fixedly arranged at the other end of the scraper seat (431), the radian of the arc surface of the fan-shaped scraper head (432) is matched with the radian of the inner wall of the tank body (32), and the arc surface of the fan-shaped scraper head (432) is in contact with the inner wall of the tank body (32).
4. The planetary ball mill according to claim 1, characterized in that: the height of the tank body (32) is less than the distance from the lower end of the clamping plate notch (313) to the tank base bottom plate (311).
5. The planetary ball mill according to claim 1, characterized in that: the distance from the scraping rod (317) to the other end of the external thread rod (314) is larger than the length of the cylindrical sleeve (321), and the inner diameter of the cylindrical sleeve (321) is larger than the outer diameter of the spring (315).
6. The planetary ball mill according to claim 2, characterized in that: the depth of the club head groove (41) is larger than the length of the club head (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811143482.0A CN110961201A (en) | 2018-09-28 | 2018-09-28 | Planetary ball mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811143482.0A CN110961201A (en) | 2018-09-28 | 2018-09-28 | Planetary ball mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110961201A true CN110961201A (en) | 2020-04-07 |
Family
ID=70027340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811143482.0A Pending CN110961201A (en) | 2018-09-28 | 2018-09-28 | Planetary ball mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110961201A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113617470A (en) * | 2021-08-25 | 2021-11-09 | 重庆医药高等专科学校 | A planetary ball mill for soil sample preparation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080197223A1 (en) * | 2007-02-15 | 2008-08-21 | Nagao System Inc. | Planetary ball mill |
| CN204768967U (en) * | 2015-07-08 | 2015-11-18 | 广东中涂联涂料科技有限公司 | Planetary ball mill scrape wall ware |
| CN105312123A (en) * | 2014-07-10 | 2016-02-10 | 南京南大仪器有限公司 | Scraper for planetary ball mill |
| CN205673007U (en) * | 2016-05-10 | 2016-11-09 | 陕西科技大学 | A kind of planetary ball mill |
| CN206240558U (en) * | 2016-11-17 | 2017-06-13 | 山东科技大学 | A kind of sealed compartment formula planetary ball mill |
| CN209093505U (en) * | 2018-09-28 | 2019-07-12 | 安徽致磨新材料科技有限公司 | A kind of planetary ball mill |
-
2018
- 2018-09-28 CN CN201811143482.0A patent/CN110961201A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080197223A1 (en) * | 2007-02-15 | 2008-08-21 | Nagao System Inc. | Planetary ball mill |
| CN105312123A (en) * | 2014-07-10 | 2016-02-10 | 南京南大仪器有限公司 | Scraper for planetary ball mill |
| CN204768967U (en) * | 2015-07-08 | 2015-11-18 | 广东中涂联涂料科技有限公司 | Planetary ball mill scrape wall ware |
| CN205673007U (en) * | 2016-05-10 | 2016-11-09 | 陕西科技大学 | A kind of planetary ball mill |
| CN206240558U (en) * | 2016-11-17 | 2017-06-13 | 山东科技大学 | A kind of sealed compartment formula planetary ball mill |
| CN209093505U (en) * | 2018-09-28 | 2019-07-12 | 安徽致磨新材料科技有限公司 | A kind of planetary ball mill |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113617470A (en) * | 2021-08-25 | 2021-11-09 | 重庆医药高等专科学校 | A planetary ball mill for soil sample preparation |
| CN113617470B (en) * | 2021-08-25 | 2022-07-19 | 重庆医药高等专科学校 | Planetary ball mill for preparing soil sample |
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