CN112238043A - Pearl sieving mechanism - Google Patents
Pearl sieving mechanism Download PDFInfo
- Publication number
- CN112238043A CN112238043A CN202010932216.7A CN202010932216A CN112238043A CN 112238043 A CN112238043 A CN 112238043A CN 202010932216 A CN202010932216 A CN 202010932216A CN 112238043 A CN112238043 A CN 112238043A
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- screen
- sliding
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- screening
- rods
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Classifications
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- 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
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- 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
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- 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
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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
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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- Combined Means For Separation Of Solids (AREA)
Abstract
The invention relates to a screening device, in particular to a pearl screening device. The invention aims to solve the technical problem of how to design a pearl screening device which can screen pearls more carefully so as to ensure better screening effect. In order to solve the above technical problems, the present invention provides a pearl screening apparatus, comprising: the bottom of the chassis is connected with a supporting leg; the connecting frame is connected to the middle of the top of the chassis, the top of the connecting frame is connected with an inclined wall frame body, a plurality of openings are uniformly formed in the lower portion of the inclined wall frame body at intervals along the circumferential direction, and the bottom in the inclined wall frame body is in a conical arrangement; a screening mechanism provided on the inclined wall frame; and the driving mechanism is arranged between the chassis and the screening mechanism. The pearl screening device achieves the effect of screening pearls through the matching operation of the screening mechanism, the driving mechanism and the material guide mechanism.
Description
Technical Field
The invention relates to a screening device, in particular to a pearl screening device.
Background
With the improvement of the quality of life of people in modern society, pearls are important ornaments, such as eardrops, pendants, bracelets, foot chains and other jewelry areas, are used, are one kind of organic precious stones and are mainly produced in pearl shells and nacre mollusks, the pearls are pearl sacs formed by mantle cells of the mussels, which secrete nacre, and the nacre cells coat the nucleuses to form the pearls. After the pearl is taken out, the pearl needs to be screened.
Through the retrieval, the patent that granted patent publication number is CN204074482U discloses a pearl sieving mechanism, include base, screening case, vibration mechanism, collection material room, discharge gate, supporting spring and put the sieve mouth, be equipped with supporting spring on the base, the last screening case of installing of supporting spring, be equipped with collection material room and vibration mechanism in the screening incasement, the top at vibration mechanism is established to the collection material room, be equipped with the discharge gate on the collection material room, the top of collection material room is equipped with puts the sieve mouth, compares with prior art, can practice thrift the manual work, and work efficiency is high, and it is effectual to filter to simple structure, low in production cost. The above patents suffer from the following disadvantages: the screening is not careful enough, and only rough screening can be carried out, and the requirements of people cannot be met.
Therefore, a pearl screening device which can screen pearls more carefully so as to achieve a better screening effect needs to be developed.
Disclosure of Invention
(1) Technical problem to be solved
In order to overcome the defects that the screening is not fine enough, the screening can only be carried out roughly and the screening effect is not good, the invention provides the pearl screening device which can screen pearls more finely so as to ensure better screening effect.
(2) Technical scheme
In order to solve the technical problem, the invention provides a pearl screening device which comprises a base plate, wherein the bottom of the base plate is connected with a supporting leg; the connecting frame is connected to the middle of the top of the chassis, the top of the connecting frame is connected with an inclined wall frame body, a plurality of openings are uniformly formed in the lower portion of the inclined wall frame body at intervals along the circumferential direction, and the bottom in the inclined wall frame body is in a conical arrangement; a screening mechanism provided on the inclined wall frame; the driving mechanism is arranged between the chassis and the screening mechanism; and the material guide mechanism is arranged between the base plate and the screening mechanism.
Preferably, the screening mechanism comprises two guide rods, the two guide rods are symmetrically connected to the bottom of the inclined wall frame body, and the guide rods are both connected with connecting plates in a sliding manner; a first screen connected between the connection plates, the first screen being capable of blocking the opening; the two reset springs are arranged and are connected between the connecting plate and the inclined wall frame body; the second screen is connected to the top of the first screen, the screen hole of the second screen is larger than that of the first screen, and the second screen can also block the opening; the two magnetic blocks are arranged and respectively connected to two sides of the top of the second screen; and the rotating shaft is rotatably connected to the middle part in the inclined wall frame body, the upper part of the rotating shaft is rotatably connected with a transmission rod, and the transmission rod is matched with the magnetic block.
Preferably, the driving mechanism comprises a motor which is arranged in the middle of the top of the chassis, an output shaft of the motor is connected with a rotating shaft, the lower part of the rotating shaft is connected with a swing rod, and the swing rod is in contact with the bottom in the inclined wall frame body.
Preferably, the material guiding mechanism comprises a plurality of material plates which are arranged in a plurality of blocks, and the plurality of material plates are uniformly connected between the first screen and the second screen at intervals along the circumferential direction; the material frames are consistent in quantity with the material plates, the material frames are connected to the base plate at intervals along the circumferential direction, and the discharge ends of the material plates are aligned to the material frames respectively.
Preferably, the fine screening mechanism comprises a plurality of sliding plates which are arranged in a sliding manner, the sliding plates are connected to the chassis in a sliding manner at uniform intervals along the circumferential direction, and two sliding rods are connected between the sliding plates and the connecting plate; the first screen frames are arranged in a plurality of ways and are respectively connected to the plurality of sliding rods in a sliding manner; the second screen frames are arranged in a plurality of ways, the first screen frames are respectively connected to the slide rods in a sliding manner, the sieve pores of the first screen frames are larger than those of the second screen frames, and the first screen frames and the second screen frames are both positioned at the discharge ends of the flitches; the compression springs are arranged in a plurality of ways and are respectively connected between the second screen frames and the sliding plates; the inclined plates are arranged in a plurality of groups, the inclined plates are uniformly connected to the top of the chassis at intervals along the circumferential direction, each group of inclined plates is arranged in two groups, and the two inclined plates of each group are respectively positioned on two sides of the material frame; the push rods are arranged in a plurality of ways, the push rods are connected to two sides of the first net frames respectively, and the push rods are matched with the inclined plates.
Preferably, the screen frame further comprises a plurality of connecting rods, the connecting rods are connected to the plurality of sliding rods respectively and are in sliding fit with the first screen frame and the second screen frame respectively, and a push plate is connected between the connecting rods on the two sliding rods on the same sliding plate.
(3) Advantageous effects
1. The pearl screening device achieves the effect of screening pearls through the matching operation of the screening mechanism, the driving mechanism and the material guide mechanism.
2. According to the pearl screening machine, the pearl is more finely screened through the fine screening mechanism, so that the pearl screening effect is better.
3. Compared with the patents, the screening method can more finely screen during screening, so that the screening effect is better, and the technical problems in the patents are effectively solved.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic partial perspective view of a first embodiment of the present invention.
Fig. 3 is a second partial perspective view of the present invention.
The labels in the figures are: 1-base plate, 2-support leg, 3-connecting frame, 4-inclined wall frame body, 5-screening mechanism, 51-first screen, 52-guide rod, 53-connecting plate, 54-reset spring, 55-second screen, 56-magnetic block, 57-rotating shaft, 58-transmission rod, 6-driving mechanism, 61-motor, 62-oscillating bar, 7-guide mechanism, 71-material plate, 72-material frame, 8-fine screen mechanism, 81-sliding plate, 82-sliding rod, 83-first screen frame, 84-second screen frame, 85-compression spring, 86-inclined plate, 87-push rod, 9-connecting rod and 10-push plate.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example 1
The utility model provides a pearl sieving mechanism, as shown in fig. 1-3, including chassis 1, landing leg 2, link 3 and skew wall framework 4, chassis 1 bottom is connected with landing leg 2, chassis 1 top intermediate junction has link 3, link 3 top is connected with skew wall framework 4, the even interval of circumference is opened along the 4 lower parts of skew wall framework has four openings, the bottom is the toper setting in the skew wall framework 4, still including screening mechanism 5, actuating mechanism 6 and guide mechanism 7, be equipped with screening mechanism 5 on the skew wall framework 4, be equipped with actuating mechanism 6 between chassis 1 and the screening mechanism 5, be equipped with guide mechanism 7 between chassis 1 and the screening mechanism 5.
The screening mechanism 5 comprises a first screen 51, two guide rods 52, a connecting plate 53, a return spring 54, a second screen 55, magnetic blocks 56, a rotating shaft 57 and a transmission rod 58, the bottom of the inclined wall frame 4 is symmetrically connected with the two guide rods 52, the two guide rods 52 are both connected with the connecting plate 53 in a sliding manner, the first screen 51 is connected between the connecting plates 53, the first screen 51 can block an opening, the return spring 54 is connected between the connecting plate 53 and the inclined wall frame 4, the top of the first screen 51 is connected with the second screen 55, the sieve pores of the second screen 55 are larger than those of the first screen 51, the second screen 55 can also block the opening, the magnetic blocks 56 are connected to two sides of the top of the second screen 55, the rotating shaft 57 is rotatably connected to the middle inside the inclined wall frame 4, the transmission rod 58 is rotatably connected to the upper.
The driving mechanism 6 comprises a motor 61 and a swing rod 62, the motor 61 is installed in the middle of the top of the chassis 1, an output shaft of the motor 61 is connected with a rotating shaft 57, the swing rod 62 is connected with the lower portion of the rotating shaft 57, and the swing rod 62 is in contact with the bottom in the inclined wall frame 4.
The material guiding mechanism 7 comprises material plates 71 and material frames 72, four material plates 71 are uniformly connected between the first screen 51 and the second screen 55 at intervals along the circumferential direction, four material frames 72 are uniformly connected on the chassis 1 at intervals along the circumferential direction, and the discharge ends of the four material plates 71 are respectively aligned with the four material frames 72.
When pearls need to be screened, the device can be used, firstly, a user can pour the pearls into the inclined wall frame body 4, after the pearls are poured, the user can start the motor 61 to drive the rotating shaft 57 to rotate, the rotating shaft 57 rotates to drive the swing rod 62 to rotate, the swing rod 62 rotates to stir the pearls in the inclined wall frame body 4, so that the smaller pearls in the inclined wall frame body 4 are screened out through the first screen mesh 51, the screened pearls fall into the material frame 72 through the material plate 71, at this time, the collecting frame can be placed below the material frame 72, the pearls in the material frame 72 fall into the collecting frame, after the screening of the smaller pearls is finished, the user can twist the transmission rod 58 to rotate, after the transmission rod 58 rotates to be contacted with the magnetic block 56, the transmission rod 58 continues to rotate to push the magnetic block 56 to move downwards, the magnetic block 56 moves downwards to drive the first screen mesh 51 and the second screen mesh 55 to move downwards, the first screen mesh 51 drives the, the return spring 54 is stretched, the opening on the inclined wall frame body 4 is blocked by the second screen 55 after the first screen 51 and the second screen 55 move downwards, the collecting frame can be replaced at this time, and then the larger pearls are screened out by the swing rod 62 when the swing rod rotates, so that the pearls can be screened, and after the screening is finished, the motor 61 is turned off.
Example 2
On the basis of embodiment 1, as shown in fig. 3, the fine screening mechanism 8 further comprises a sliding plate 81, a sliding rod 82, a first net frame 83, a second net frame 84, a compression spring 85, inclined plates 86 and a push rod 87, the fine screening mechanism 8 comprises four sliding plates 81 which are connected to the chassis 1 at equal intervals in the circumferential direction, two sliding rods 82 are connected between the sliding plates 81 and the connecting plate 53, the sliding rods 82 are connected to the first net frame 83 and the second net frame 84 in a sliding manner, the sieve holes of the first net frame 83 are larger than those of the second net frame 84, the first net frame 83 and the second net frame 84 are both located at the discharge end of the material plate 71, the compression spring 85 is connected between the second net frame 84 and the sliding plates 81, four groups of inclined plates 86 are connected to the top of the chassis 1 at equal intervals in the circumferential direction, each group of inclined plates 86 is provided, the two inclined plates 86 of each group are respectively located at two sides of the material frame 72, the push rods 87 are connected to the front and, push rod 87 engages ramp plate 86.
When pearls screened by the first screen 51 fall, pearls screened by the first screen 51 fall into the second screen 84, medium-sized pearls are blocked by the second screen 84, smaller pearls fall through the second screen 84, when the second screen 55 screens, the connecting plate 53 moves downwards to drive the sliding plate 81 to move downwards through the first screen 83, the sliding plate 81 moves downwards to drive all devices on the sliding plate to move downwards, the first screen 83 moves downwards along the inclined plate 86 in a direction away from the inclined wall frame 4 through the push rod 87, the first screen 83 pushes the second screen 84 to move together when moving, the compression spring 85 is compressed, when an opening on the inclined wall frame 4 is blocked by the second screen 55, the first screen 83 is also aligned with the discharge end of the material plate 71, and pearls screened by the second screen 55 can be screened again through the first screen 83 when falling, thereby reach the secondary screening, so, just can carry out more careful screening to the pearl.
As shown in fig. 3, the device further comprises a connecting rod 9 and a push plate 10, the connecting rod 9 is connected to the sliding rod 82, the connecting rod 9 is respectively in sliding fit with the first screen frame 83 and the second screen frame 84, and the push plate 10 is connected between the connecting rods 9 on the two sliding rods 82 on the same sliding plate 81.
When the first net frame 83 and the second net frame 84 move, the collecting frames can be replaced, when the first net frame 83 moves, the push plate 10 and the connecting rod 9 do not move, at the moment, the push plate 10 can push out the pearls with the medium size in the first net frame 83, and therefore manual collection is not needed, and manpower is effectively saved.
The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. The pearl screening device is characterized by comprising: the bottom of the chassis (1) is connected with a supporting leg (2); the connecting frame (3) is connected to the middle of the top of the chassis (1), the top of the connecting frame (3) is connected with an inclined wall frame body (4), a plurality of openings are uniformly formed in the lower portion of the inclined wall frame body (4) at intervals along the circumferential direction, and the inner bottom of the inclined wall frame body (4) is in a conical arrangement; a screening mechanism (5) provided on the sloped-wall frame (4); a drive mechanism (6) arranged between the chassis (1) and the screening mechanism (5); and the material guide mechanism (7) is arranged between the base plate (1) and the screening mechanism (5).
2. Pearl screening apparatus according to claim 1, wherein the screening mechanism (5) comprises: the two guide rods (52) are arranged, the two guide rods (52) are symmetrically connected to the bottom of the inclined wall frame body (4), and the guide rods (52) are connected with connecting plates (53) in a sliding mode; a first screen (51) connected between the connection plates (53), the first screen (51) being capable of blocking the opening; two return springs (54) are arranged, and the two return springs (54) are connected between the connecting plate (53) and the inclined wall frame body (4); a second screen (55) connected to the top of the first screen (51), wherein the second screen (55) has a mesh larger than that of the first screen (51), and the second screen (55) can also block the opening; the two magnetic blocks (56) are arranged, and the two magnetic blocks (56) are respectively connected to the two sides of the top of the second screen (55); and the rotating shaft (57) is rotatably connected to the inner middle part of the inclined wall frame body (4), the upper part of the rotating shaft (57) is rotatably connected with a transmission rod (58), and the transmission rod (58) is matched with the magnetic block (56).
3. Pearl screening device according to claim 2, characterized in that the driving mechanism (6) comprises: the motor (61) is arranged in the middle of the top of the chassis (1), an output shaft of the motor (61) is connected with the rotating shaft (57), the lower part of the rotating shaft (57) is connected with the swing rod (62), and the swing rod (62) is in contact with the bottom in the inclined wall frame body (4).
4. The pearl screening device according to claim 3, wherein the material guiding mechanism (7) comprises: the flitch (71), it is multiple that it sets up, multiple flitch (71) connect between first screen cloth (51) and second screen cloth (55) along the even interval of circumference; the number of the material frames (72) is consistent with that of the material plates (71), a plurality of material frames (72) are uniformly connected to the chassis (1) at intervals along the circumferential direction, and the discharge ends of the material plates (71) are respectively aligned to the material frames (72).
5. The pearl screening device according to claim 4, further comprising a fine screening mechanism (8), wherein the fine screening mechanism (8) comprises: the sliding plates (81) are arranged in a plurality of blocks, the sliding plates (81) are connected to the chassis (1) in a sliding manner at uniform intervals along the circumferential direction, and two sliding rods (82) are connected between the sliding plates (81) and the connecting plate (53); the first screen frames (83) are arranged in a plurality of ways, and the first screen frames (83) are respectively connected to the sliding rods (82) in a sliding way; the second screen frames (84) are arranged in a plurality of ways, the first screen frames (83) are respectively connected to the slide rods (82) in a sliding manner, the screen holes of the first screen frames (83) are larger than those of the second screen frames (84), and the first screen frames (83) and the second screen frames (84) are both positioned at the discharge end of the flitch (71); a plurality of compression springs (85) which are arranged, wherein the plurality of compression springs (85) are respectively connected between the plurality of second screen frames (84) and the plurality of sliding plates (81); the inclined plates (86) are arranged in multiple groups, the multiple groups of inclined plates (86) are uniformly connected to the top of the chassis (1) at intervals along the circumferential direction, each group of inclined plates (86) is arranged in two groups, and the two inclined plates (86) of each group are respectively positioned on two sides of the material frame (72); the push rods (87) are arranged in a plurality of ways, the push rods (87) are respectively connected to two sides of the first net frames (83), and the push rods (87) are matched with the inclined plates (86).
6. The pearl screening apparatus according to claim 5, further comprising: the connecting rods (9) are arranged in multiple ways, the connecting rods (9) are connected to the sliding rods (82) respectively, the connecting rods (9) are in sliding fit with the first screen frame (83) and the second screen frame (84) respectively, and a push plate (10) is connected between the connecting rods (9) on the two sliding rods (82) on the same sliding plate (81).
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CN202010932216.7A CN112238043B (en) | 2020-09-08 | 2020-09-08 | Pearl sieving mechanism |
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CN202010932216.7A CN112238043B (en) | 2020-09-08 | 2020-09-08 | Pearl sieving mechanism |
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CN112238043A true CN112238043A (en) | 2021-01-19 |
CN112238043B CN112238043B (en) | 2022-08-12 |
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Citations (11)
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GB182651A (en) * | 1921-06-04 | 1922-07-13 | Henry Hurst | Improvements in riddles, sifters, and the like |
GB797007A (en) * | 1955-05-05 | 1958-06-25 | Cameron Maclean & Co J | Improved screening machine for granular material |
CN102574160A (en) * | 2009-07-16 | 2012-07-11 | 弗莱贝格工业大学 | Method and device for the selective classification of particles according to the size thereof |
CN108246621A (en) * | 2018-03-26 | 2018-07-06 | 柯丹 | A kind of bearing ball oscillatory type hierarchical screening device |
CN108435570A (en) * | 2018-03-12 | 2018-08-24 | 浙江德美轴承有限公司 | A kind of steel ball cleaning equipment of the bearing machining with screening function |
CN208627807U (en) * | 2018-07-16 | 2019-03-22 | 河南省天中人家生态农业发展有限公司 | A kind of niblet screening plant |
CN208786859U (en) * | 2018-07-04 | 2019-04-26 | 李瑞江 | A kind of grain screening machine of variable screening net |
CN110773415A (en) * | 2019-10-24 | 2020-02-11 | 西安寒武纪石油科技有限公司 | Production process of well cementation ceramic hollow microspheres |
CN110935684A (en) * | 2019-12-05 | 2020-03-31 | 苏州中国珍珠宝石城有限公司 | Cleaning and screening device for pearl processing and using method thereof |
CN111215335A (en) * | 2019-11-14 | 2020-06-02 | 杭州魔象智能科技有限公司 | Rotation type disc pearl sieving mechanism |
CN211412689U (en) * | 2019-11-26 | 2020-09-04 | 聚羧宝科技有限公司 | Novel chemical material screening machine for chemical industry |
-
2020
- 2020-09-08 CN CN202010932216.7A patent/CN112238043B/en active Active
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB182651A (en) * | 1921-06-04 | 1922-07-13 | Henry Hurst | Improvements in riddles, sifters, and the like |
GB797007A (en) * | 1955-05-05 | 1958-06-25 | Cameron Maclean & Co J | Improved screening machine for granular material |
CN102574160A (en) * | 2009-07-16 | 2012-07-11 | 弗莱贝格工业大学 | Method and device for the selective classification of particles according to the size thereof |
CN108435570A (en) * | 2018-03-12 | 2018-08-24 | 浙江德美轴承有限公司 | A kind of steel ball cleaning equipment of the bearing machining with screening function |
CN108246621A (en) * | 2018-03-26 | 2018-07-06 | 柯丹 | A kind of bearing ball oscillatory type hierarchical screening device |
CN208786859U (en) * | 2018-07-04 | 2019-04-26 | 李瑞江 | A kind of grain screening machine of variable screening net |
CN208627807U (en) * | 2018-07-16 | 2019-03-22 | 河南省天中人家生态农业发展有限公司 | A kind of niblet screening plant |
CN110773415A (en) * | 2019-10-24 | 2020-02-11 | 西安寒武纪石油科技有限公司 | Production process of well cementation ceramic hollow microspheres |
CN111215335A (en) * | 2019-11-14 | 2020-06-02 | 杭州魔象智能科技有限公司 | Rotation type disc pearl sieving mechanism |
CN211412689U (en) * | 2019-11-26 | 2020-09-04 | 聚羧宝科技有限公司 | Novel chemical material screening machine for chemical industry |
CN110935684A (en) * | 2019-12-05 | 2020-03-31 | 苏州中国珍珠宝石城有限公司 | Cleaning and screening device for pearl processing and using method thereof |
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