Glass bead screening device

Abstract

The invention discloses a glass bead screening device, and relates to the technical field of glass bead sorting devices.The glass bead screening device comprises an inner flotation barrel, and a stirring rotating disc is installed at the bottom of the inner flotation barrel in a fixed-axis rotating mode; the outer separation centrifugal barrel is rotatably mounted on the outer side of the inner flotation barrel through a slewing bearing fixed shaft, the centrifugal separation interlayer is divided into a plurality of separation chambers by the separation partition plates, the outer protection barrel is fixedly mounted on a base, and the inner flotation barrel is fixedly connected with the base through a plurality of supporting columns. Floating glass beads are sorted in an overflow mode, and the outer sorting centrifugal barrel is driven to rotate in the overflow process of the glass beads, so that the glass beads with different liquid level heights enter different sorting chambers, and the hollow glass beads are screened and classified according to the density; and further, glass bead products meeting different requirements are sorted out.

Description

Technical Field

[0001] The invention relates to the technical field of glass microbead manufacturing, and in particular to a glass microbead screening device. Background Art

[0002] Hollow glass microspheres (HGMs) are hollow glass microspheres typically made of materials such as borosilicate glass or silica. Their excellent structural strength, thermal insulation, and sound insulation properties have led to their widespread application in aerospace, building materials, and marine engineering.

[0003] The hollowness of glass microspheres directly affects their physical and chemical properties. After grading, the most suitable microspheres can be selected for different needs. Microspheres with a hollowness of around 60% are ideal for building insulation materials, microspheres with a hollowness of over 80% are ideal for aerospace applications, and microspheres with a hollowness of less than 20% are suitable as reinforcing fillers for composite materials due to their high compressive strength. Therefore, it is necessary to screen glass microspheres of different hollowness for application in different fields.

[0004] The limitation of existing flotation equipment is that it can only perform binary separation (i.e., "floating" and "sinking") based on a single threshold value of material density and flotation fluid, and cannot perform more detailed classification of the floated material (such as further classification by density gradient or particle size). This shortcoming is particularly evident in the field of hollow glass microspheres, which require high-precision sorting, because the properties of glass microspheres (such as strength, thermal insulation, and fluidity) are highly sensitive to particle size and density distribution. Summary of the Invention

[0005] The object of the present invention is to provide a glass microbead screening device to solve the following technical problem: the existing technology can only separate two types of materials with properties higher than the flotation liquid density and lower than the flotation liquid density. This flotation separation method cannot further classify the floated materials, and thus cannot be used in the field of fine screening of glass microbeads.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A glass bead screening device comprises an inner flotation cylinder, wherein the inner flotation cylinder is provided with an inner cavity for carrying glass beads and flotation liquid, a stirring turntable is fixedly mounted on the bottom of the inner flotation cylinder in a rotatable manner, and the stirring turntable is lifted and lowered in the inner flotation cylinder, and an overflow hole is provided on the top of the inner flotation cylinder, and during the ascent of the stirring turntable, the mixed liquid of the beads flows out of the inner flotation cylinder through the overflow hole;

[0008] An external sorting centrifugal cylinder is fixedly mounted on the outside of the inner flotation cylinder in a rotating manner. A centrifugal sorting interlayer connected to the overflow hole is formed between the inner flotation cylinder and the external sorting centrifugal cylinder. Dehydration holes are evenly opened on the external sorting centrifugal cylinder, and the fixed-axis rotation of the external sorting centrifugal cylinder promotes the separation of glass beads and flotation liquid that fall into the centrifugal sorting interlayer. A plurality of sorting partitions are also installed in a circular array on the inside of the external sorting centrifugal cylinder. The plurality of sorting partitions divide the centrifugal sorting interlayer into a plurality of sorting chambers. When the stirring turntable rises to push the microbead mixture out of the overflow hole, the external sorting centrifugal cylinder synchronously rotates by no more than 270 degrees to allow the microbead mixture before and after the overflow to enter the corresponding sorting chamber.

[0009] The outer protection cylinder is fixedly arranged on the outside of the outer separation centrifugal cylinder, and the outer protection cylinder and the outer separation centrifugal cylinder do not contact each other.

[0010] As a further solution of the present invention: a hollow lifting rod is fixedly connected to the bottom of the stirring turntable, and one end of the hollow lifting rod passes through the bottom axis of the inner flotation cylinder;

[0011] A discharge port is provided at the axis of the stirring turntable, and an opening and closing ball valve is installed in the discharge port. The opening and closing ball valve is rotated 90 degrees by an opening and closing motor to connect or close the inner cavity with the hollow lifting rod.

[0012] As a further solution of the present invention, a ball bearing is installed at the bottom of the hollow lifting rod, and the outer ring of the ball bearing is also connected to a pair of lifting traction ropes, and the lifting traction ropes are wound around their respective reel-up reels at one end away from the ball bearing. The reel-up reel is fixedly mounted on the driving shaft of the lifting motor, and the driving shaft of the lifting motor is also connected to the active wheel of the first one-way ratchet, and the outer edge of the driven wheel of the first one-way ratchet is provided with teeth, and the teeth of the driven wheel are meshed with the teeth grooves provided at the bottom of the external sorting centrifugal cylinder; when the reel-up reel is reeled, the hollow lifting rod drives the stirring turntable to rise, and the driven wheel of the first one-way ratchet rotates synchronously with the active wheel, thereby driving the external sorting centrifugal cylinder to perform a clockwise fixed-axis rotational motion. When the reel-up reel is unwinding, the hollow lifting rod drives the stirring turntable to descend under the action of the ball bearing and its own gravity, and at this time the external sorting centrifugal cylinder is in a stationary state.

[0013] As a further solution of the present invention: a pair of rotating motors are also fixedly installed at the bottom of the inner flotation cylinder, and the rotating motors are respectively connected to the driving wheels of the corresponding second one-way ratchet wheels, and the driven wheels of the second one-way ratchet wheels engage with the tooth grooves provided on the outer edge of the hollow lifting rod through the teeth provided thereon.

[0014] As a further solution of the present invention: a pair of the rotating motors are also respectively connected to the driving wheels of the corresponding third one-way ratchet, and the driven wheel of the third one-way ratchet engages with the tooth grooves opened on the inner side of the centrifugal sleeve through the teeth opened thereon. The rotating motor drives the centrifugal sleeve to rotate clockwise during the reverse rotation process. The centrifugal sleeve is fixedly installed on the bottom of the external sorting centrifugal cylinder. The rotation of the centrifugal sleeve drives the external sorting centrifugal cylinder to rotate synchronously in the clockwise direction. The forward rotation of the rotating motor will not drive the centrifugal sleeve to rotate synchronously.

[0015] As a further solution of the present invention: the second one-way ratchet and the third one-way ratchet are both installed at the bottom of the inner flotation cylinder.

[0016] As a further solution of the present invention: a plurality of T-shaped assembly grooves are provided in a circular array on the inner side of the outer separation centrifugal cylinder, and the separation partitions are fixedly inserted into the T-shaped assembly grooves.

[0017] As a further solution of the present invention: the inner flotation cylinder is fixedly connected to the base through a plurality of support columns, and the outer protection cylinder is fixedly installed on the base.

[0018] As a further solution of the present invention: an inner axial groove and an outer annular groove are respectively opened on the inner and outer sides of the base, the inner axial groove is used to receive the microbead mixture falling from the hollow lifting rod, and the outer annular groove is used to receive the flotation liquid separated from the sorting chamber during the centrifugal process.

[0019] As a further solution of the present invention: a protective cover is movably provided above the outer protective cylinder.

[0020] Beneficial effects of the present invention:

[0021] The present invention sorts floating glass microbeads by overflow, and drives the external sorting centrifugal cylinder to rotate during the overflow of the glass microbeads, so that glass microbeads with different liquid levels enter different sorting chambers, thereby screening and classifying the hollow glass microbeads according to density, and then sorting out glass microbead products that meet different needs. After the sorting is completed, the glass microbeads are centrifugally dried. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a three-dimensional schematic diagram of the installation structure of the external separation centrifuge cylinder of the present invention;

[0024] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0025] Figure 3 It is a three-dimensional schematic diagram of the bottom installation structure of the inner flotation cylinder of the present invention;

[0026] Figure 4 This is a schematic diagram of the installation structure of the stirring turntable of the present invention;

[0027] Figure 5 This is a schematic diagram of the stirring turntable of the present invention in an ascending state;

[0028] Figure 6 Attached to the instruction manual Figure 4 Schematic diagram of the enlarged structure of area A in the middle;

[0029] Figure 7 This is a schematic diagram of the overall structure of the protective cover of the present invention in the open state.

[0030] In the figure: 1. Inner flotation cylinder; 2. Inner cavity; 3. Stirring turntable; 4. Overflow hole; 5. External separation centrifugal cylinder; 6. Slewing bearing; 7. Centrifugal separation interlayer; 8. Dehydration hole; 9. Sorting partition; 10. Sorting chamber; 11. External protective cylinder; 12. Base; 13. Support column; 14. Lifting hole; 15. Hollow lifting rod; 16. Opening and closing ball valve; 17. Opening and closing motor; 18. Ball bearing; 19. Lifting and pulling rope; 20. Rewinding and unwinding reel; 21. Lifting motor; 22. First one-way ratchet; 23. Rotating motor; 24. Driving wheel; 25. Driven wheel; 26. Third one-way ratchet; 27. Centrifugal sleeve; 28. T-shaped assembly groove; 29. Inner axis groove; 30. Outer annular groove; 31. Protective cover. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] See also Figure 1-7 As shown, the present invention is a glass bead screening device, comprising: an inner flotation cylinder 1, the inner flotation cylinder 1 being fixedly arranged, and having an inner cavity 2 for carrying glass beads and flotation liquid; a stirring turntable 3 being fixedly mounted on the bottom of the inner flotation cylinder 1 in a rotatable manner; the stirring turntable 3 being raised and lowered in the inner flotation cylinder 1; an overflow hole 4 penetrating inside and outside the inner flotation cylinder 1 being further provided above the inner flotation cylinder 1; during the ascending process of the stirring turntable 3, the mixed liquid of beads flows out of the inner flotation cylinder 1 through the overflow hole 4;

[0033] The outer sorting centrifugal cylinder 5 is fixedly mounted on the outside of the inner flotation cylinder 1 via a slewing bearing 6. A centrifugal sorting interlayer 7 connected to the overflow hole 4 is formed between the inner flotation cylinder 1 and the outer sorting centrifugal cylinder 5. Dehydration holes 8 are evenly opened on the outer sorting centrifugal cylinder 5 and penetrate the outer and inner parts. The fixed-axis rotation of the outer sorting centrifugal cylinder 5 promotes the separation of the glass beads and the flotation liquid that fall into the centrifugal sorting interlayer 7. A plurality of sorting partitions 9 are also installed in an annular array on the inner side of the outer sorting centrifugal cylinder 5. The plurality of sorting partitions 9 divide the centrifugal sorting interlayer 7 into a plurality of sorting chambers 10. When the stirring turntable 3 rises to push the microbead mixture out of the overflow hole 4, the outer sorting centrifugal cylinder 5 synchronously performs a rotational motion of no more than 270° so that the microbead mixture before and after the overflow enters the corresponding sorting chamber 10.

[0034] The outer protective cylinder 11 is fixedly arranged on the outside of the outer separation centrifugal cylinder 5, and the outer protective cylinder 11 and the outer separation centrifugal cylinder 5 do not contact each other; and

[0035] The outer protection cylinder 11 is fixedly mounted on the base 12 , and the inner flotation cylinder 1 is fixedly connected to the base 12 via a plurality of support columns 13 .

[0036] In this embodiment, the inner flotation cylinder 1 is fixedly arranged, and an inner cavity 2 for carrying glass beads and flotation liquid is opened therein. The glass beads and flotation liquid are mixed to form a mixed liquid of beads. The flotation liquid in this embodiment is based on water, and ethanol and surfactant are added to make the density of the flotation liquid lower than that of water. The addition of surfactant can enhance the hydrophobicity of the glass beads and improve the flotation effect. A certain amount of glass beads and flotation liquid are added during each flotation process, and stirred by the stirring turntable 3. Due to the different hollowness of different glass beads, the glass beads with higher hollowness have greater buoyancy and are located near the liquid surface, while the glass beads with lower hollowness are located at a lower position below the liquid surface. The glass beads with a hollowness lower than the density of the flotation liquid will directly sink to the inner cavity. At the bottom of the chamber 2, after stirring is completed, the glass beads are at different heights according to their density differences. After standing for a period of time, the stirring turntable 3 is driven to rise slowly. When the liquid level reaches the overflow hole 4, overflow occurs. Since the overflow process is to discharge the micro-bead mixture above the liquid level, the setting of the overflow hole 4 can make the glass beads at different depths flow out in order. In addition, the outer separation centrifugal cylinder 5 in this embodiment is fixedly rotatably mounted on the outside of the inner flotation cylinder 1 through the slewing bearing 6. A centrifugal separation interlayer 7 connected to the overflow hole 4 is formed between the inner flotation cylinder 1 and the outer separation centrifugal cylinder 5. A centrifugal separation interlayer 7 connected to the overflow hole 4 is formed between the inner flotation cylinder 1 and the outer separation centrifugal cylinder 5. And in the process of slow rising of the stirring turntable 3, the external sorting centrifugal cylinder 5 synchronously performs a rotation movement of no more than 270°, so that the microbead mixture before and after the overflow enters the corresponding sorting chamber 10. Through this arrangement, the microbead mixtures of different densities can fall into the centrifugal sorting interlayer 7 in order, thereby forming a density gradient in the centrifugal sorting interlayer 7. The rotation angle of the external sorting centrifugal cylinder 5 each time does not exceed 270°. The significance of this arrangement is to prevent the first and last microbead mixtures from crossing and misaligning. By setting the external sorting centrifugal cylinder 5 to perform a clockwise rotation movement during the sorting process, the first and last microbead mixtures that fall can be accurately judged. Since the external sorting centrifugal cylinder 5 is evenly provided with internal and external penetration holes, the microbead mixtures that fall first and last can be accurately judged. After the beads are mixed and fall through the dehydration hole 8, the surplus flotation liquid will flow out through the dehydration hole 8. After the sorting is completed, the centrifugal dehydration can be carried out by rotating the external sorting centrifugal cylinder 5 at high speed, thereby separating the flotation liquid from the glass beads. After the dehydration is completed, the protective cover 31 is opened, and the negative pressure adsorption tube is sequentially inserted into different sorting chambers 10 to collect glass beads of different densities. After the collection is completed, the glass beads entering different sorting chambers 10 are selected again for hollowness detection. Usually, the hollowness of the glass beads overflowed by flotation is between 40% and 90%. The glass beads are numbered according to the order in which they are in the sorting chamber 10, for example, 1, 2, 3... Assume that when No. 3 is detected, the hollowness of the glass beads is 85%.The hollowness of the glass beads in sorting chambers 10 from 1 to 3 is greater than or equal to 85%. If the hollowness of glass bead No. 6 is detected to be 60%, then the hollowness of glass beads between No. 3 to 6 is between 60% and 85%. This allows for rapid classification of glass beads with different hollownesses, ultimately determining the hollowness range of the glass beads in each sorting chamber 10. Finally, glass beads with different hollownesses are classified according to the needs of different materials. It can be seen from this that this device cannot determine the hollowness range of glass beads in different sorting chambers 10. However, according to the clockwise arrangement order, the glass beads in different sorting chambers 10 will inevitably show a trend of decreasing density. Utilizing this principle, the hollowness range within the sorting chamber 10 interval can be quickly determined in the subsequent detection process, thereby achieving the purpose of rapid sorting.

[0037] A lifting hole 14 is provided at the axis center of the bottom of the inner flotation cylinder 1, which runs through the inside and outside. A hollow lifting rod 15 is inserted in the lifting hole 14 in a lifting manner. The hollow lifting rod 15 is located at one end of the inner flotation cylinder 1 and is fixedly connected to the stirring turntable 3. A discharge port is provided at the axis center of the stirring turntable 3, and an opening and closing ball valve 16 is installed in the discharge port. The opening and closing ball valve 16 is fixedly connected to the drive shaft of the opening and closing motor 17. The 90° rotation movement of the opening and closing motor 17 makes the inner cavity 2 connected or closed with the hollow lifting rod 15.

[0038] In this embodiment, a hollow lifting rod 15 is fixedly installed at the bottom of the axis of the stirring turntable 3, and a discharge port is opened at the axis of the stirring turntable 3. An opening and closing ball valve 16 is installed in the discharge port. The opening and closing ball valve 16 is driven to rotate by the operation of the opening and closing motor 17 so that the inner cavity 2 is connected or closed with the hollow lifting rod 15. When the flotation is completed, the glass beads with lower hollowness settled at the bottom of the liquid surface flow out from the bottom of the hollow lifting rod 15 by opening the discharge port, and finally the glass beads with lower hollowness are sorted out.

[0039] A ball bearing 18 is installed at the bottom of the hollow lifting rod 15. The inner ring of the ball bearing 18 is fixedly installed on the hollow lifting rod 15. A pair of lifting traction ropes 19 are also connected to the outer ring of the ball bearing 18. The lifting traction ropes 19 are wound around their respective reel drums 20 at one end away from the ball bearing 18. The reel drums 20 are fixedly installed on the driving shaft of the lifting motor 21. The driving shaft of the lifting motor 21 is also connected to the driving wheel of the first one-way ratchet 22. The outer edge of the driven wheel of the first one-way ratchet 22 is opened. There are teeth, and the teeth of the driven wheel are engaged with the tooth grooves provided at the bottom of the external sorting centrifugal cylinder 5. When the reel 20 is reeled, the hollow lifting rod 15 drives the stirring turntable 3 to rise, and the driven wheel of the first one-way ratchet 22 rotates synchronously with the driving wheel, thereby driving the external sorting centrifugal cylinder 5 to perform a clockwise fixed-axis rotation motion. When the reel 20 is unreeled, the hollow lifting rod 15 drives the stirring turntable 3 to descend under the action of the ball bearing 18 and its own gravity. At this time, the external sorting centrifugal cylinder 5 is in a stationary state.

[0040] In this embodiment, a specific structure for driving the hollow lifting rod 15 to perform lifting motion is further disclosed. A ball bearing 18 is installed at the bottom of the hollow lifting rod 15. A pair of lifting traction ropes 19 are connected to the outer ring of the ball bearing 18. The lifting traction ropes 19 are wound around their respective reel-on and reel-off reels 20 at one end away from the ball bearing 18. The reel-on and reel-off reels 20 are wound by the rotation of the lifting motor 21, thereby using the lifting traction ropes 19 to pull the ball bearing 18 up. The inner ring of the ball bearing 18 is interference fit with the hollow lifting rod 15, thereby driving the hollow lifting rod 15 to rise synchronously, and the driving shaft of the lifting motor 21 is also connected to the active shaft of the first one-way ratchet 22. On the wheel, the outer edge of the driven wheel of the first one-way ratchet 22 is provided with teeth, and the teeth of the driven wheel are engaged with the tooth grooves provided at the bottom of the external sorting centrifuge cylinder 5. Therefore, the lifting motor 21 also synchronously drives the driven wheel of the first one-way ratchet 22 to rotate during the winding process, and the rotation of the driven wheel of the first one-way ratchet 22 drives the external sorting centrifuge cylinder 5 to move. The advantage of this arrangement is that the rising process of the stirring turntable 3 is linked to the rotation process of the external sorting centrifuge cylinder 5, thereby ensuring the synchronization and stability of the movement of the stirring turntable 3 and the external sorting centrifuge cylinder 5, and then the microbead mixture can enter different sorting chambers 10 according to the difference in density gradient, thereby completing the sorting operation.

[0041] A pair of rotary motors 23 are also fixedly installed at the bottom of the inner flotation cylinder 1. The rotary motors 23 are respectively connected to the driving wheels 24 of the corresponding second one-way ratchet wheels. The driven wheels 25 of the second one-way ratchet wheels engage with the tooth grooves provided on the outer edge of the hollow lifting rod 15 through the teeth provided thereon. When the rotary motor 23 rotates in the forward direction, it synchronously drives the hollow lifting rod 15 to rotate, thereby driving the stirring turntable 3 to stir the microbead mixture in the inner cavity 2. The reverse rotation of the rotary motor 23 will not drive the hollow lifting rod 15 to rotate synchronously.

[0042] A pair of rotating motors 23 are also respectively connected to the driving wheels of the corresponding third one-way ratchet 26. The driven wheel of the third one-way ratchet 26 engages with the tooth grooves provided on the inner side of the centrifugal sleeve 27 through the teeth provided thereon. The rotating motor 23 drives the centrifugal sleeve 27 to rotate clockwise during the reverse rotation. The centrifugal sleeve 27 is fixedly installed at the bottom of the external sorting centrifugal cylinder 5. The rotation of the centrifugal sleeve 27 drives the external sorting centrifugal cylinder 5 to rotate synchronously in the clockwise direction. The forward rotation of the rotating motor 23 will not drive the centrifugal sleeve 27 to rotate synchronously.

[0043] In this embodiment, a common rotation drive mechanism of the stirring turntable 3 and the external sorting centrifugal cylinder 5 is further disclosed. The rotating motor 23 is connected to the driving wheel 24 of the second one-way ratchet. The driven wheel 25 of the second one-way ratchet engages with the tooth grooves provided on the outer edge of the hollow lifting rod 15 through the teeth provided thereon. When the rotating motor 23 rotates in the forward direction, it synchronously drives the hollow lifting rod 15 to rotate, thereby driving the rotation of the stirring turntable 3. The microbead mixture in the inner cavity 2 is stirred by the stirring turntable 3. At the same time, the reverse rotation of the rotating motor 23 can drive the centrifugal sleeve 27 to rotate in the clockwise direction. The arrangement of the second one-way ratchet and the third one-way ratchet 26 makes During the forward and reverse rotational movement, the rotating motor 23 drives only one of the hollow lifting rod 15 or the centrifugal sleeve 27 to rotate, and prevents interference between the two. The first one-way ratchet 22, the second one-way ratchet and the third one-way ratchet 26 have the same structure, and all use the internal pawl structure to achieve unidirectional rotation. The structure moves more widely in the prior art and will not be described here. In addition, the outer sorting centrifugal cylinder 5 only rotates in the clockwise direction. One of the third one-way ratchet 26 and the first one-way ratchet 22 will not interfere when driving the outer sorting centrifugal cylinder 5 to rotate. The second one-way ratchet and the third one-way ratchet 26 are both installed at the bottom of the inner flotation cylinder 1.

[0044] A plurality of T-shaped assembly grooves 28 are provided in an annular array on the inner side of the outer separation centrifugal cylinder 5 , and the separation partitions 9 are fixedly inserted into the T-shaped assembly grooves 28 .

[0045] In this embodiment, the sorting partitions 9 are designed to be detachable, so that the number of corresponding sorting chambers 10 can be flexibly set according to the sorting needs, and the sorting partitions 9 need to be arranged in a circular array along the axis of the external sorting centrifugal cylinder 5. The more sorting partitions 9 are set, the higher the corresponding sorting accuracy.

[0046] An inner axial groove 29 and an outer annular groove 30 are respectively formed on the inner and outer sides of the base 12. The inner axial groove 29 is used to receive the microbead mixture falling from the hollow lifting rod 15, and the outer annular groove 30 is used to receive the flotation liquid separated from the sorting chamber 10 during the centrifugal process.

[0047] In this embodiment, an inner axial groove 29 and an outer annular groove 30 are respectively provided on the inner and outer sides of the base 12, so that the centrifuged flotation liquid can fall into the outer annular groove 30 for subsequent collection, and the microbead mixture falling from the hollow lifting rod 15 enters the inner axial groove 29, and the flotation liquid and glass beads are subsequently further separated manually. Therefore, a closed door for operators to enter is also provided on the side of the outer protective cylinder 11, which is no longer shown in the figure.

[0048] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A glass microbead screening device, characterized in that: include: An inner flotation cylinder (1) is provided with an inner cavity (2) for carrying glass microbeads and flotation liquid. A stirring turntable (3) is fixedly mounted on the bottom of the inner flotation cylinder (1) in a rotatable manner. The stirring turntable (3) moves up and down in the inner flotation cylinder (1). An overflow hole (4) is also provided on the top of the inner flotation cylinder (1) and penetrates inside and outside. When the stirring turntable (3) rises, the microbead mixed liquid flows out to the outside of the inner flotation cylinder (1) through the overflow hole (4). The outer separation centrifugal cylinder (5) is fixedly mounted on the outer side of the inner flotation cylinder (1) in a rotating manner. A centrifugal separation interlayer (7) communicating with the overflow hole (4) is formed between the inner flotation cylinder (1) and the outer separation centrifugal cylinder (5). Dehydration holes (8) extending through the outer and inner sides of the outer separation centrifugal cylinder (5) are evenly formed. The fixed-axis rotation of the outer separation centrifugal cylinder (5) causes the glass microbeads and the glass microbeads falling into the centrifugal separation interlayer (7) to be discharged. Flotation liquid separation, the inner side of the outer separation centrifugal cylinder (5) is further provided with a plurality of separation partitions (9) in an annular array, and the plurality of separation partitions (9) separate the centrifugal separation interlayer (7) into a plurality of separation chambers (10). When the stirring turntable (3) rises to push the microbead mixture to flow out of the overflow hole (4), the outer separation centrifugal cylinder (5) synchronously performs a rotational motion of no more than 270 degrees so that the microbead mixture before and after the overflow enters the corresponding separation chamber (10); The outer protective cylinder (11) is fixedly arranged on the outside of the outer separation centrifugal cylinder (5), and the outer protective cylinder (11) and the outer separation centrifugal cylinder (5) do not contact each other.

2. A glass microbead screening device according to claim 1, characterized in that: A hollow lifting rod (15) is fixedly connected to the bottom of the stirring turntable (3), and one end of the hollow lifting rod (15) passes through the bottom axis of the inner flotation cylinder (1); A discharge port is provided at the axis of the stirring turntable (3), and an opening and closing ball valve (16) is installed in the discharge port. The opening and closing ball valve (16) is rotated 90 degrees by an opening and closing motor (17) to connect or close the inner cavity (2) with the hollow lifting rod (15).

3. A glass microbead screening device according to claim 2, characterized in that: A ball bearing (18) is installed at the bottom of the hollow lifting rod (15), and a pair of lifting traction ropes (19) are connected to the outer ring of the ball bearing (18). The lifting traction ropes (19) are wound around their respective reeling reels (20) at one end away from the ball bearing (18). The reeling reels (20) are fixedly installed on the driving shaft of the lifting motor (21). The driving shaft of the lifting motor (21) is also connected to the driving wheel of the first one-way ratchet (22). The outer edge of the driven wheel of the first one-way ratchet (22) is provided with teeth. The teeth of the driven wheel are engaged with the tooth grooves provided at the bottom of the external sorting centrifugal cylinder (5); when the reel (20) is reeling, the hollow lifting rod (15) drives the stirring turntable (3) to rise, and the driven wheel of the first one-way ratchet (22) rotates synchronously with the driving wheel, thereby driving the external sorting centrifugal cylinder (5) to perform a clockwise fixed-axis rotation movement. When the reel (20) is unreeling, the hollow lifting rod (15) drives the stirring turntable (3) to descend under the action of the ball bearing (18) and its own gravity, and at this time the external sorting centrifugal cylinder (5) is in a stationary state.

4. The glass microbead screening device according to claim 1, characterized in that: A pair of rotating motors (23) are fixedly mounted on the bottom of the inner flotation cylinder (1). The rotating motors (23) are respectively connected to the driving wheels (24) of the corresponding second one-way ratchet wheels. The driven wheels (25) of the second one-way ratchet wheels are engaged with the tooth grooves provided on the outer edge of the hollow lifting rod (15) through the teeth provided thereon.

5. A glass microbead screening device according to claim 4, characterized in that: A pair of the rotating motors (23) are also respectively connected to the driving wheels of the corresponding third one-way ratchet (26); the driven wheels of the third one-way ratchet (26) are engaged with the tooth grooves provided on the inner side of the centrifugal sleeve (27) through the teeth provided thereon; the rotating motor (23) drives the centrifugal sleeve (27) to rotate in a clockwise direction during the reverse rotation process; the centrifugal sleeve (27) is fixedly mounted on the bottom of the outer sorting centrifugal cylinder (5); the outer sorting centrifugal cylinder (5) is synchronously rotated in a clockwise direction by the rotation of the centrifugal sleeve (27); and the forward rotation of the rotating motor (23) does not drive the centrifugal sleeve (27) to rotate synchronously.

6. A glass microbead screening device according to claim 5, characterized in that: The second one-way ratchet and the third one-way ratchet (26) are both installed at the bottom of the inner flotation cylinder (1).

7. The glass microbead screening device according to claim 1, characterized in that: A plurality of T-shaped assembly grooves (28) are provided in an annular array on the inner side of the outer separation centrifugal cylinder (5), and the separation partitions (9) are fixedly inserted into the T-shaped assembly grooves (28).

8. The glass microbead screening device according to claim 1, characterized in that: The inner flotation cylinder (1) is fixedly connected to the base (12) via a plurality of support columns (13), and the outer protection cylinder (11) is fixedly mounted on the base (12).

9. A glass microbead screening device according to claim 8, characterized in that: The base (12) is provided with an inner axial groove (29) and an outer annular groove (30) on both inner and outer sides, respectively. The inner axial groove (29) is used to receive the microbead mixture falling from the hollow lifting rod (15), and the outer annular groove (30) is used to receive the flotation liquid separated from the sorting chamber (10) during the centrifugal process.

10. The glass microbead screening device according to claim 1, characterized in that: A protective cover plate (31) is also movably provided above the outer protective cylinder (11).

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