Ultrafine yttrium oxide preparation device

Abstract

The application discloses a superfine yttrium oxide preparation device and relates to the technical field of yttrium oxide processing. The device comprises a main body, a grinding cavity and a plugging mechanism arranged in the main body, an annular plate fixed in the grinding cavity, a grinding mechanism arranged at the bottom of the annular plate, a powder selecting mechanism arranged at the top of the grinding cavity, the plugging mechanism located between the powder selecting mechanism and the grinding mechanism, and the plugging mechanism having a first state of plugging the annular plate and a second state of opening the annular plate. The superfine yttrium oxide preparation device can plug the annular plate in the first state of the plugging mechanism, so that the ascending air flow only flows to the powder selecting mechanism through the outside of the annular plate, and the material at the grinding mechanism can be normally ground under the action of gravity. The powder with a mesh number not meeting the target mesh number after grinding cannot enter the powder selecting mechanism when ascending with the air flow and falls on the plugging mechanism.

Description

Technical Field

[0001] This invention relates to the field of yttrium oxide processing technology, and more specifically to an apparatus for preparing ultrafine yttrium oxide. Background Technology

[0002] Yttrium oxide is a compound formed by the reaction of yttrium and oxygen. It is a white solid with good stability and high-temperature resistance. Yttrium oxide is commonly used as a raw material for the production of rare earth elements and can also be used to prepare optical glass, ceramics, and other materials. In addition, yttrium oxide has a wide range of applications in electronics, optics, and magnetic materials. During the processing of yttrium oxide, it needs to be ground to obtain powder with a larger mesh size.

[0003] For example, the patent document with authorization announcement number CN115350770B, authorization announcement date June 7, 2023, and titled "A Preparation Device for High-Temperature Resistant and High Specific Surface Activity Alumina," includes a base plate, a grinding chamber disposed above the base plate, and a powder outlet cylinder disposed inside the grinding chamber. A side seat is fixedly connected to the upper outer wall of the base plate, and a sleeve is fixedly connected to the outer wall of the powder outlet cylinder. This patent utilizes airflow to draw powder from the grinding chamber into the powder outlet cylinder, while large particles of raw material remain inside the chamber for grinding.

[0004] In existing powder preparation devices, a powder selection structure is generally set up to screen powders that meet the target mesh size for discharge. The powder selection structure is usually located at the top of the device. When the powder is drawn into the powder selection structure by the rising airflow, the material in the grinding structure will be affected by the airflow. Especially for powders with a mesh size slightly smaller than the target mesh size, the rising airflow will have a more serious impact, which will prevent them from re-entering the grinding structure for grinding under the action of gravity. Summary of the Invention

[0005] The purpose of this invention is to provide an ultrafine yttrium oxide preparation apparatus to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An ultrafine yttrium oxide preparation apparatus includes a main body, wherein the main body is provided with:

[0008] A grinding chamber has an annular plate fixed inside, a grinding mechanism is provided at the bottom of the annular plate, and a powder selection mechanism is provided at the top of the grinding chamber;

[0009] A blocking mechanism is located between the powder selection mechanism and the grinding mechanism, and the blocking mechanism has a first state of blocking the annular plate and a second state of opening the annular plate.

[0010] The aforementioned ultrafine yttrium oxide preparation apparatus includes a grinding mechanism comprising an inner grinding disc rotatably connected to the main body and an outer grinding disc fixed to an annular plate.

[0011] The aforementioned ultrafine yttrium oxide preparation apparatus has a feed pipe fixed on its main body, with one end of the feed pipe extending to the inner grinding disc.

[0012] The aforementioned ultrafine yttrium oxide preparation apparatus includes a sealing mechanism comprising a rotating shaft rotatably connected to an annular plate, wherein a sealing plate adapted to the annular plate is fixed on the rotating shaft.

[0013] The aforementioned ultrafine yttrium oxide preparation apparatus includes a turntable rotatably connected to the main body, an incomplete gear portion fixed on the turntable, a transmission gear adapted to the incomplete gear portion fixed on the rotating shaft, and a torsion spring provided between the rotating shaft and the annular plate.

[0014] The aforementioned ultrafine yttrium oxide preparation apparatus has a flat portion on the rotating shaft and an arc-shaped protrusion on the rotating disk.

[0015] In the aforementioned ultrafine yttrium oxide preparation apparatus, a drive shaft is fixed on the inner grinding disc, a transmission shaft is rotatably connected to the main body, the turntable is fixed on the transmission shaft, and a first transmission assembly is provided between the drive shaft and the transmission shaft.

[0016] The above-mentioned ultrafine yttrium oxide preparation device includes a powder selection mechanism comprising a discharge channel fixed on the main body and a first filter cartridge, wherein a second filter cartridge is rotatably connected to the outside of the first filter cartridge.

[0017] In the aforementioned ultrafine yttrium oxide preparation apparatus, a second transmission component is provided between the transmission shaft and the second filter cartridge.

[0018] In the aforementioned ultrafine yttrium oxide preparation apparatus, the first filter cartridge has equidistantly spaced sealing sections.

[0019] In the above technical solution, the present invention provides an ultrafine yttrium oxide preparation device. The first state of the sealing mechanism can seal the annular plate so that the rising airflow can only flow to the powder selection mechanism through the outside of the annular plate and cannot flow to the powder selection mechanism through the inside of the annular plate. This allows the material at the grinding mechanism to be ground normally under the action of gravity. For some powders whose mesh size does not meet the target mesh size, they cannot enter the powder selection mechanism when they rise with the airflow and will fall onto the sealing mechanism. When the sealing mechanism switches to the second state, the powder on the sealing mechanism will fall back into the grinding mechanism for grinding under the action of gravity. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present invention;

[0022] Figure 2 A cross-sectional view provided for yet another embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional structural schematic diagram provided for another embodiment of the present invention;

[0024] Figure 4 An exploded view of the transmission gear structure provided in another embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of a first transmission component provided in another embodiment of the present invention;

[0026] Figure 6 This is an exploded view of the structure at the first filter cartridge according to another embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the inner grinding disc provided in another embodiment of the present invention;

[0028] Figure 8 This is a top view of the internal grinding disc structure provided in another embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Main body; 2. Grinding chamber; 3. Annular plate; 4. Inner grinding disc; 5. Outer grinding disc; 6. Roller; 7. Guide plate; 8. Feed pipe; 9. Rotary shaft; 10. Sealing plate; 11. Turntable; 12. Incomplete gear section; 13. Transmission gear; 14. First limiting plate; 15. Second limiting plate; 16. Flat section; 17. Arc-shaped protrusion; 18. Drive shaft; 19. Transmission shaft; 20. First transmission wheel; 21. Second transmission wheel; 22. First transmission belt; 23. Discharge channel; 24. First filter cartridge; 25. Second filter cartridge; 26. Third transmission wheel; 27. Fourth transmission wheel; 28. Second transmission belt; 29. ​​Sealing section; 30. Conical truncated cone; 31. Connecting ring; 32. Push rod; 33. Drive ring; 34. Connecting rod; 35. First friction wheel; 36. Second friction wheel; 37. Hinge rod. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Reference Figure 1-8 This invention provides an ultrafine yttrium oxide preparation device, comprising a main body 1, a grinding chamber 2 and a sealing mechanism disposed within the main body 1, an annular plate 3 fixed inside the grinding chamber 2, a grinding mechanism disposed at the bottom of the annular plate 3, and a powder selection mechanism disposed at the top of the grinding chamber 2; the sealing mechanism is located between the powder selection mechanism and the grinding mechanism, and the sealing mechanism has a first state of sealing the annular plate 3 and a second state of opening the annular plate 3.

[0033] Specifically, yttrium oxide is generally ground using a grinding device during its preparation. Existing grinding mechanisms typically include a grinding chamber 2, a grinding mechanism, and a powder classifier. The lower end of the grinding chamber 2 has an opening for open air intake. The powder classifier is generally equipped with a fan structure, which allows external air to flow into the grinding chamber 2 and into the powder classifier, creating an upward airflow within the grinding chamber 2 to transport the ground powder to the powder classifier. The feeding structure of the grinding mechanism can be directly located on one side of the grinding chamber 2 to discharge the material into the grinding mechanism at the bottom of the annular plate 3. The ground powder has a relatively large mesh size (i.e., small particle size) and can move with the upward airflow. The powder is then directed to the powder selection mechanism. This mechanism typically features a high-speed rotating filter. Powder passing through the filter is of the target mesh size (i.e., powder with a mesh size greater than the target mesh size; after passing through the filter, the powder is collected by a bag or similar structure, which will not be elaborated here). Powder smaller than the target mesh size falls into the grinding mechanism for further grinding due to the impact or centrifugal force of the rotating filter. All of the above are existing technologies and will not be elaborated here. The innovation of this embodiment lies in the inclusion of an annular plate 3 within the grinding chamber 2. The annular plate 3 is ring-shaped with openings at both its upper and lower ends. This allows the grinding chamber 2 to be divided into an inner and outer chamber, with the upper and lower ends of the inner and outer chambers connected respectively. (The annular plate 3 can be fixed to the inner wall of the grinding chamber 2 via a connecting structure, such as a connecting plate structure, to minimize interference with the operation of the inner and outer chambers); the sealing mechanism is located inside the annular plate 3 and at its bottom. The sealing mechanism can be an electric valve structure, allowing it to be controlled to seal or open the annular plate 3; when the sealing mechanism is in the first state, the annular plate 3 is sealed, preventing the air inside the annular plate 3 from flowing upwards, resulting in an upward airflow only in the outer chamber. This allows the powder discharged from the grinding mechanism to move to the connection between the inner and outer chambers and move with the upward airflow in the outer chamber, thus allowing the powder to be screened by the powder selection mechanism. Powder that does not meet the target mesh size will fall into the filter. The sealing mechanism prevents the material in the grinding mechanism (i.e., the material in the annular plate 3) from being affected by the rising airflow in the outer cavity, thus minimizing the impact of gravity and rising airflow on some lighter powders with a mesh size smaller than the target mesh size floating in the grinding chamber 2 (which would prevent some material from being fully ground). When the sealing mechanism switches to the second state, the annular plate 3 is not sealed. At this time, the powder that does not meet the target mesh size accumulated on the sealing mechanism can fall into the grinding mechanism for further grinding (the sealing mechanism is in the second state for a short time, and no rising airflow is formed in the annular plate 3, so it will not affect the falling of the material on the sealing mechanism). This improves the grinding efficiency of yttrium oxide.

[0034] The present invention provides an ultrafine yttrium oxide preparation device. In the first state of the sealing mechanism, the annular plate 3 can be sealed so that the rising airflow can only flow to the powder selection mechanism through the outside of the annular plate 3, and cannot flow to the powder selection mechanism through the inside of the annular plate 3. This allows the material at the grinding mechanism to be ground normally under the action of gravity. For powders whose mesh size does not meet the target mesh size after grinding, they cannot enter the powder selection mechanism when rising with the airflow and will fall onto the sealing mechanism. When the sealing mechanism switches to the second state, the powder on the sealing mechanism will fall back into the grinding mechanism for grinding under the action of gravity.

[0035] In another embodiment of the present invention, the grinding mechanism further includes an inner grinding disc 4 rotatably connected to the main body 1 and an outer grinding disc 5 fixed to the annular plate 3. Specifically, the outer grinding disc 5 is annular in shape and fixed to the bottom of the annular plate 3. The inner grinding disc 4 is cylindrical in shape and located inside the outer grinding disc 5. Several grinding wheels 6 are rotatably connected to the outer wall of the inner grinding disc 4. The inner wall of the outer grinding disc 5 is constructed with grinding grooves adapted to the grinding wheels 6. The grinding wheels 6 and grinding grooves are adapted to each other to crush and grind the material when the inner grinding disc 4 and the outer grinding disc 5 rotate relative to each other. The main body 1 is provided with a drive mechanism for driving the inner grinding disc 4 to rotate. The drive mechanism can be a geared motor structure (not shown) in the prior art to drive the inner grinding disc 4 to rotate relative to the outer grinding disc 5. The bottom of the inner grinding disc 4 is constructed with a guide plate 7, which extends to the outer cavity. When the device is running, air enters the grinding chamber 2 from the opening at the bottom of the main body 1 and flows to the powder selection mechanism through the outer cavity. After the material is ground, the guide plate 7 can guide the powder to the outer cavity and move it to the powder selection mechanism with the rising airflow, so as to avoid the powder from being moved out from the opening at the bottom of the main body 1 as much as possible.

[0036] Preferably, a feed pipe 8 is fixed on the main body 1, with one end of the feed pipe 8 extending to the inner grinding disc 4. Specifically, one end of the feed pipe 8 is located outside the main body 1, and the other end passes through the main body 1 and the annular plate 3 and extends to the center of the inner grinding disc 4, so that material is fed into the center of the inner grinding disc 4 through the feed pipe 8. During the rotation of the inner grinding disc 4, the material on it will move between the grinding wheel 6 and the grinding groove under the action of centrifugal force and gravity and be ground; the feed pipe 8 is located at the bottom of the sealing mechanism so that the sealing mechanism can seal the annular plate 3 without affecting the feeding of the device.

[0037] As an alternative to the aforementioned electric valve structure, the sealing mechanism further includes a rotating shaft 9 rotatably connected to the annular plate 3, on which a sealing plate 10 adapted to the annular plate 3 is fixed. Specifically, the rotating shaft 9 is rotatably connected to both the main body 1 and the annular plate 3, with one end extending outside the main body 1 for easy driving. The driving method can be a motor structure from the prior art. The sealing plate 10 is constructed as a circular plate, and its diameter is adapted to the inner diameter of the annular plate 3. When the sealing plate 10 rotates to a position perpendicular to the annular plate 3, it seals the annular plate 3. Conversely, as the sealing plate 10 continues to rotate, it tilts to open the annular plate 3, allowing the material on the sealing plate 10 to fall along the tilted sealing plate 10 to the grinding mechanism below for further grinding.

[0038] As an alternative to the above-mentioned motor structure directly driving the rotating shaft 9 to rotate, a turntable 11 is rotatably connected to the main body 1, an incomplete gear part 12 is fixed on the turntable 11, a transmission gear 13 adapted to the incomplete gear part 12 is fixed on the rotating shaft 9, and a torsion spring (not shown) is provided between the rotating shaft 9 and the annular plate 3. Specifically, the inner wall of the annular plate 3 is constructed with a first limiting plate 14 and a second limiting plate 15. The first limiting plate 14 and the second limiting plate 15 can restrict the rotation angle of the sealing plate 10 (e.g., restricting the sealing plate 10 to a horizontal range of 0 degrees to a vertical range of 90 degrees, or restricting the sealing plate 10 to a range of 0-60 degrees, minimizing interference with other structures during the rotation of the sealing plate 10). When the sealing plate 10 abuts against the first limiting plate 14, the sealing plate 10 is at a horizontal 0-degree position, at which point the sealing plate 10 is perpendicular to the annular plate 3 to seal the annular plate 3. The turntable 11 is located outside the main body 1, and the central axis of the turntable 11 is perpendicular to the central axis of the rotating shaft 9. The transmission gear 13 is constructed as a bevel gear, and the incomplete gear part 12 is part of the complete bevel gear; that is, when the turntable 11 rotates, the incomplete gear part 12... 2. It can intermittently mesh with the transmission gear 13 and drive the rotating shaft 9 to rotate; the torsion spring is used to force the rotating shaft 9 and the sealing plate 10 to rotate (the sealing plate 10 is only used to seal the annular plate 3 and carry part of the powder, and its weight is relatively light. The torsion spring can force the rotating shaft 9 to rotate) so that the sealing plate 10 rotates to the position of abutting the first limiting plate 14. At this time, the sealing plate 10 seals the annular plate 3; during the rotation of the turntable 11, the incomplete gear part 12 intermittently meshes with the transmission gear 13 and drives the rotating shaft 9 to rotate so that the rotating shaft 9 overcomes the elastic force of the torsion spring and drives the sealing plate 10 to rotate to the position of abutting the second limiting plate 15, thereby opening the annular plate 3; when the incomplete gear part 12 disengages from the transmission gear 13, the rotating shaft 9 will reset under the action of the torsion spring and drive the sealing plate 10 to seal the annular plate 3 again. The advantage of this arrangement is that, in this embodiment, the turntable 11 can be driven by the motor structure to rotate continuously. During this process, the incomplete gear part 12 can drive the transmission gear 13 and the rotating shaft 9 to rotate intermittently, thereby driving the sealing plate 10 to open the annular plate 3. After the incomplete gear part 12 disengages from the transmission gear 13, the rotating shaft 9 and the sealing plate 10 can be reset under the action of the torsion spring. In this way, the continuous rotation of the turntable 11 can drive the sealing plate 10 to open intermittently, thereby intermittently discharging the powder accumulated on the sealing plate 10 into the grinding mechanism below. When the sealing plate 10 opens and touches the second limiting plate 15, a certain impact will occur between the two. At this time, the powder on the sealing plate 10 will be impacted and fall into the grinding mechanism along the inclined sealing plate 10 under the action of gravity. This can minimize the situation where powder accumulates on the sealing plate 10 and is difficult to fall.

[0039] Furthermore, the rotating shaft 9 has a flat portion 16, and the turntable 11 has an arc-shaped protrusion 17. Specifically, in the above embodiment, after the sealing plate 10 is reset under the action of the torsion spring, it will abut against the first limiting plate 14. At this time, the material below the sealing plate 10 is prone to splashing upwards during grinding, which will cause a certain impact on the sealing plate 10 and cause the sealing plate 10 to deviate at an angle. In this embodiment, a flat portion 16 and an arc-shaped protrusion 17 are provided. The arc-shaped protrusion 17 is located on the outside of the incomplete gear portion 12 (with the center of the turntable 11 as a reference), and its overall structure is arc-shaped. The flat portion 16 is located on the side of the transmission gear 13 near the sealing plate 10. When the sealing plate 10 abuts against the first limiting plate 14, the flat portion 16 faces downward (that is, towards the turntable 11 and the arc-shaped protrusion 17). At this time, when the turntable 11 rotates, it can drive the arc-shaped protrusion 17 to abut against the flat portion 16, thereby limiting the angle of the rotating shaft 9 and minimizing the angular deviation between the rotating shaft 9 and the sealing plate 10. With this configuration, during the continuous rotation of the turntable 11, the arc-shaped protrusion 17 first abuts against the flat surface 16 to restrict the rotation of the shaft 9 and the sealing plate 10. After the arc-shaped protrusion 17 separates from the flat surface 16, the incomplete gear part 12 meshes with the transmission gear 13 to drive the shaft 9 and the sealing plate 10 to rotate. Subsequently, the incomplete gear part 12 disengages from the transmission gear 13, and the shaft 9 and the sealing plate 10 reset under the action of the torsion spring. Until the sealing plate 10 resets, the arc-shaped protrusion 17 abuts against the flat surface 16 again to restrict the shaft 9. By repeating this process, the intermittent rotation of the sealing plate 10 can be achieved, thereby intermittently opening the annular plate 3 and discharging the powder on the sealing plate 10 into the grinding mechanism for grinding.

[0040] As an alternative to the above-mentioned motor structure driving the turntable 11 to rotate, preferably, a drive shaft 18 is fixed on the inner grinding disc 4, a transmission shaft 19 is rotatably connected to the main body 1, the turntable 11 is fixed on the transmission shaft 19, and a first transmission component is provided between the drive shaft 18 and the transmission shaft 19. Specifically, the drive shaft 18 is rotatably connected to the main body 1. In this embodiment, the drive mechanism is connected to the drive shaft 18 so as to drive the drive shaft 18 and the inner grinding disc 4 to rotate synchronously. The first transmission component can be a gear transmission structure in the prior art. Preferably, a first transmission wheel 20 is fixed on the drive shaft 18, and a second transmission wheel 21 is fixed on the transmission shaft 19. A first transmission belt 22 is provided between the first transmission wheel 20 and the second transmission wheel 21 so as to drive the first transmission wheel 20 and the second transmission wheel 21 to rotate synchronously and in the same direction through the first transmission belt 22. In this way, when the drive shaft 18 rotates, the first transmission component can drive the transmission shaft 19 to rotate, and then when the inner grinding disc 4 grinds the material, it passively drives the sealing plate 10 to rotate intermittently, so as to intermittently open or seal the annular plate 3.

[0041] In another embodiment of the present invention, the powder selection mechanism further includes a discharge channel 23 fixed on the main body 1 and a first filter cylinder 24, and a second filter cylinder 25 is rotatably connected to the outside of the first filter cylinder 24. Specifically, in the above embodiments, the powder selection mechanism uses a single, continuously rotating filter hood to screen the powder, so that powder that does not meet the target mesh size is knocked onto the sealing plate 10. In this embodiment, a first filter cylinder 24 and a second filter cylinder 25 replace the single filter hood in the above embodiments. The shapes of the first filter cylinder 24 and the second filter cylinder 25 are similar to those of filter hoods in the prior art, both of which are covers with powder screening functions and openings at the top. The first filter cylinder 24 is fixed on the top wall of the grinding chamber 2, and the discharge channel 23 is fixed on the top of the main body 1 and extends into the first filter cylinder 24. The second filter cylinder 25 is rotatably connected to the outer wall of the first filter cylinder 24, and the two are in close contact with each other. The screening mesh size of the second filter cylinder 25 is the same as the set target mesh size, and the screening mesh size of the first filter cylinder 24 is less than the set target mesh size. A fan or other structure is provided in the discharge channel 23 to extract air and powder from the grinding chamber 2, so that the powder in the grinding chamber 2 moves with the rising airflow to the first filter cylinder 24 and the second filter cylinder 25 for filtration. The purpose of this arrangement is that the second filter cartridge 25 can be driven by a motor or other structure to rotate around the first filter cartridge 24. During the relative rotation of the two, air can directly enter the discharge channel 23. The ground powder needs to be sorted by the second filter cartridge 25. For powder with a mesh size greater than the target mesh size, it can pass through the first filter cartridge 24 and the second filter cartridge 25 and be discharged through the discharge channel 23. For powder with a mesh size smaller than the target mesh size, it cannot pass through the second filter cartridge 25 and falls onto the sealing plate 10. The advantages are: firstly, the rotating second filter cartridge 25 can sieve the powder and knock off the powder that does not meet the requirements onto the sealing plate 10 (using centrifugal force and impact force); secondly, the relative rotation of the first filter cartridge 24 and the second filter cartridge 25 can shear off some powder stuck on the second filter cartridge 25, minimizing the clogging of the second filter cartridge 25 by powder.

[0042] As an alternative to the above-mentioned motor structure driving the second filter cartridge 25 to rotate, a second transmission assembly is further provided between the transmission shaft 19 and the second filter cartridge 25. Specifically, the second transmission assembly can be a gear transmission structure in the prior art. Preferably, a third transmission wheel 26 is fixed to the outer wall of the second filter cartridge 25, a fourth transmission wheel 27 is fixed on the transmission shaft 19, and a second transmission belt 28 is provided between the third transmission wheel 26 and the fourth transmission wheel 27 so that the third transmission wheel 26 and the fourth transmission wheel 27 can be driven to rotate synchronously and in the same direction through the second transmission belt 28. In this way, when the transmission shaft 19 rotates, the second filter cartridge 25 can be driven to rotate through the second transmission assembly. That is, when the transmission shaft 19 rotates, it can drive the turntable 11 and the fourth transmission wheel 27 to rotate synchronously, thereby driving the second filter cartridge 25 to continuously rotate around the second filter cartridge 25 under the drive of the transmission shaft 19.

[0043] Preferably, the first filter cartridge 24 has equidistantly spaced sealing portions 29. Specifically, the first filter cartridge 24 is constructed as a sieve structure. In this embodiment, the first filter cartridge 24 has equidistantly spaced sealing portions 29. The sealing portions 29 are solid structures and do not have a sieving function. During the rotation of the second filter cartridge 25 relative to the first filter cartridge 24, the same part of the second filter cartridge 25 will intermittently pass through the sealing portions 29. Obviously, when the same part of the second filter cartridge 25 passes through the sealing portions 29, it will be blocked, preventing air and powder from passing through this part. The advantage is that, in the above embodiment, the second filter cartridge 25 needs to rotate at high speed to knock off the non-compliant powder onto the sealing plate 10 (the centrifugal force generated by high-speed rotation is large). If the second filter cartridge 25 rotates slowly, the non-compliant powder will be adsorbed onto the outer wall of the second filter cartridge 25 with the air, which will cause blockage of the second filter cartridge 25. In this embodiment, the same part of the second filter cartridge 25 will intermittently lose its sieving function when rotating relative to the first filter cartridge 24 (that is, the part of the second filter cartridge 25 corresponding to the blocking part 29 will be blocked and cannot be sieved). This setting allows the second filter cartridge 25 to maintain a relatively slow rotation speed. During the process, the powder adsorbed on the outer wall of the second filter cartridge 25 will fall off when passing the blocking part 29 (when not passing the blocking part 29, the inside of the second filter cartridge 25 is under negative pressure, and some unqualified powder will be adsorbed on the outer wall of the second filter cartridge 25. When passing the blocking part 29, the inside of the second filter cartridge 25 is blocked and there is no negative pressure, so the powder on the outer wall of the second filter cartridge 25 will fall off under the action of gravity and the mutual shearing action of the first filter cartridge 24 and the second filter cartridge 25). Thus, the second filter cartridge 25 achieves the above-mentioned function at a relatively slow rotation speed.

[0044] It should be noted that the rotational speeds of the inner grinding disc 4, the drive shaft 19, and the second filter cartridge 25 can be adjusted by adjusting the transmission ratio of the first and second transmission components. This is existing technology and will not be elaborated here.

[0045] In another embodiment of the present invention, the inner grinding disc 4 is further provided with a truncated cone 30 at its top. The truncated cone 30 is located at the bottom of the discharge pipe. When the material falls from the discharge pipe, it passes through the truncated cone 30 and scatters to different positions on the top wall of the inner grinding disc 4. A connecting ring 31 is sleeved on the outer wall of the truncated cone 30. The connecting ring 31 is fixed to the inner wall of the annular plate 3 (it can be fixed to the annular plate 3 through a connecting plate or other structure). Multiple push rods 32 are hinged on the connecting ring 31. The push rods 32 are arc-shaped. A driving ring 33 is rotatably connected to the inner wall of the annular plate 3. Multiple connecting rods 34 are hinged to the upper part, and each connecting rod 34 is hinged to a multiple push rod 32. With this configuration, when the inner grinding disc 4 rotates to grind the material, the push rods 32 and other structures remain stationary relative to the annular plate 3, but rotate relative to the inner grinding disc 4. As the material rotates with the inner grinding disc 4, the push rods 32 can push the material falling from the cone 30 while remaining stationary, thus pushing the material between the grinding wheel 6 and the grinding groove. A first friction wheel 35 is fixed on the drive shaft 19, and a component adapted to the first friction wheel 35 is rotatably connected to the main body 1. The second friction wheel 36 has a connecting part fixed between its main body 1 and the annular plate 3. The connecting part has a connecting groove, and a hinge rod 37 is installed within the groove. One end of the hinge rod 37 is hinged to the drive ring 33, and the other end is hinged to the second friction wheel 36 (the hinge point is offset from the center of the second friction wheel 36). This arrangement allows the first friction wheel 35 to rotate when the drive shaft 19 rotates. The first friction wheel 35 and the second friction wheel 36 achieve transmission through friction. When the second friction wheel 36 rotates, the second friction wheel 36… The hinge point of the hinge rod 37 will move closer to or further away from the drive ring 33. In this way, the drive ring 33 can be pushed and pulled by the hinge rod 37. In turn, the rotation of the drive ring 33 will drive multiple push rods 32 to rotate synchronously around the connecting ring 31, thereby pushing the material on the inner grinding disc 4. This will further improve the dispersion of the material on the inner grinding disc 4 and the feeding rate (that is, improve the efficiency of material being transported from the top of the inner grinding disc 4 to the grinding wheel 6 and the grinding roller), and try to avoid the material on the inner grinding disc 4 getting stuck or affecting the grinding.

[0046] It should be noted that the turntable 11, the first transmission wheel 20 and the third transmission wheel 26 are coaxially arranged with the transmission shaft 19 and are all located outside the main body 1. Therefore, a protective shell is constructed on the outer wall of the main body 1 to protect the above-mentioned parts. At the same time, the protective shell can prevent the main body 1 from leaking powder, etc., which will not be elaborated here. The corresponding transmission shaft 19 is rotatably connected to the protective shell on the outer wall of the main body 1, and the second friction wheel 36 is also rotatably connected to the protective shell.

[0047] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An apparatus for preparing ultrafine yttrium oxide, comprising a main body, characterized in that, The main body is provided with: A grinding chamber has an annular plate fixed inside, a grinding mechanism is provided at the bottom of the annular plate, and a powder selection mechanism is provided at the top of the grinding chamber; A blocking mechanism is located between the powder selection mechanism and the grinding mechanism, and the blocking mechanism has a first state of blocking the annular plate and a second state of opening the annular plate. The grinding mechanism includes an inner grinding disc rotatably connected to the main body and an outer grinding disc fixed on an annular plate; The sealing mechanism includes a rotating shaft rotatably connected to an annular plate, and a sealing plate adapted to the annular plate is fixed on the rotating shaft; A turntable is rotatably connected to the main body, an incomplete gear part is fixed on the turntable, a transmission gear adapted to the incomplete gear part is fixed on the rotating shaft, and a torsion spring is provided between the rotating shaft and the annular plate. The inner wall of the annular plate has a first limiting plate and a second limiting plate; the transmission gear is a bevel gear, and the incomplete gear part is part of the complete bevel gear. When the turntable rotates, the incomplete gear part can intermittently mesh with the transmission gear and drive the rotating shaft to rotate. The rotating shaft has a flat portion, and the turntable has an arc-shaped protrusion. A drive shaft is fixed on the inner grinding disc, a transmission shaft is rotatably connected to the main body, the turntable is fixed on the transmission shaft, and a first transmission assembly is provided between the drive shaft and the transmission shaft. The inner grinding disc has a truncated cone at the top, located at the bottom of the discharge pipe. When the material falls from the discharge pipe, it passes through the truncated cone and scatters to different positions on the top wall of the inner grinding disc. A connecting ring is fitted on the outer wall of the truncated cone and is fixed to the inner wall of the annular plate. Multiple push rods are hinged to the connecting ring, and the push rods are arc-shaped. A drive ring is rotatably connected to the inner wall of the annular plate, and multiple connecting rods are hinged to the drive ring. The multiple connecting rods are respectively hinged to the multiple push rods. A first friction wheel is fixed on the drive shaft, and a second friction wheel adapted to the first friction wheel is rotatably connected to the main body. A connecting part is fixed between the main body and the annular plate. The connecting part has a connecting groove, and a hinge rod is set in the connecting groove. One end of the hinge rod is hinged to the drive ring, and the other end is hinged to the second friction wheel. When the drive shaft rotates, it drives the first friction wheel and the second friction wheel to rotate. When the second friction wheel rotates, the hinge point between the second friction wheel and the hinge rod will move closer to or further away from the drive ring. In this way, the hinge rod pushes and pulls the drive ring, and then the rotation of the drive ring drives multiple push rods to rotate synchronously around the connecting ring, thereby pushing the material on the inner grinding disc.

2. The ultrafine yttrium oxide preparation apparatus according to claim 1, characterized in that, A feed pipe is fixed on the main body, and one end of the feed pipe extends to the inner grinding disc.

3. The ultrafine yttrium oxide preparation apparatus according to claim 1, characterized in that, The powder selection mechanism includes a discharge channel fixed on the main body and a first filter cylinder, with a second filter cylinder rotatably connected to the outside of the first filter cylinder.

4. The ultrafine yttrium oxide preparation apparatus according to claim 3, characterized in that, A second transmission assembly is provided between the transmission shaft and the second filter cartridge.

5. The ultrafine yttrium oxide preparation apparatus according to claim 3, characterized in that, The first filter cartridge has equidistant sealing sections.

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