A high-abrasion-capacity rare earth polishing powder calcination kiln and its preparation process

Abstract

This invention relates to the field of polishing powder calcination kiln technology, specifically to a high-abrasion-weight rare earth polishing powder calcination kiln and its preparation process; it includes a first calcination kiln and a second calcination kiln arranged sequentially, with a sagger uniform material unit between the first and second calcination kilns; a feeding unit is provided on the side of the first calcination kiln, and a discharging unit is provided on the side of the second calcination kiln; a transfer unit is provided between the feeding unit and the discharging unit; this invention solves the technical problem of how to improve the calcination uniformity of polishing powder in the sagger.

Description

Technical Field

[0001] This invention relates to the field of polishing powder calcination kiln technology, specifically to a high-abrasion rare earth polishing powder calcination kiln and its preparation process. Background Technology

[0002] The erosion rate (i.e., the rate at which material is removed from the workpiece during polishing) essentially depends on the crystal integrity, grain size uniformity, hardness consistency, and surface activity of the polishing powder particles. These characteristics are entirely determined by the temperature field and the uniformity of material heating during calcination. In the production of rare earth polishing powder, the calcining kiln is the main production equipment, and it is necessary to use the calcining kiln to continuously calcine the rare earth polishing powder at high temperatures. The high erosion rate of rare earth polishing powder is directly and significantly related to the calcination uniformity of the calcining kiln.

[0003] Chinese patent CN220083717U discloses a calcining kiln for lanthanum oxide cerium polishing powder. Rare earth polishing powder is carried in saggers and transported into the kiln for calcination. This process tends to result in better calcination of the outer polishing powder and poorer calcination of the inner polishing powder. It also leads to the coexistence of under-calcined and over-calcined particles: under-calcined particles have low activity due to insufficient decomposition, while over-calcined particles have poor dispersion due to severe agglomeration. Both reduce the overall polishing yield, ultimately resulting in large fluctuations in the polishing yield of the entire batch of polishing powder, with an average polishing yield far lower than that of uniformly calcined products.

[0004] Therefore, the problem in the existing technology is: how to improve the calcination uniformity of the polishing powder in the sagger. Summary of the Invention

[0005] This invention provides a high-abrasion-weight rare earth polishing powder calcination kiln and its preparation process, aiming to solve the technical problem of how to improve the calcination uniformity of polishing powder in the sagger.

[0006] The technical solution used in this invention is as follows:

[0007] The first aspect of this application proposes a high-abrasion-weight rare earth polishing powder calcining kiln, comprising a first calcining kiln and a second calcining kiln arranged sequentially, with a sagger-type material leveling unit between the first and second calcining kilns; a feeding unit is provided on the side of the first calcining kiln, and a discharging unit is provided on the side of the second calcining kiln, with a transfer unit between the feeding unit and the discharging unit; the sagger-type material leveling unit includes material leveling legs and a material leveling frame disposed on the material leveling legs, with transfer rollers respectively provided on both sides of the material leveling frame; a transfer motor is provided on the side of the transfer rollers, and the transfer motor is used to drive the transfer rollers to rotate; upper support push rods are provided on both sides of the middle of the material leveling frame, and the push heads of the upper support push rods extend upward through the material leveling frame and are fixed to the upper support base plate; Several upper support columns are slidably fitted onto the support base plate, with the upper support columns spaced apart. The upper side of each upper support column is provided with an upper support plate for supporting the sagger. The lower side of each upper support column is fixed to an upper support connecting plate. A lower moving frame is provided on the lower side of the upper support base plate, and a lower moving push rod is provided on the lower side of the lower moving frame. The push head of the lower moving push rod passes upward through the lower moving frame and is fixed to the upper support connecting plate. Ball bearing seats are provided at intervals on the upper side of the upper support base plate, and the ball bearing seats are located between the upper support columns. A material leveling support frame is vertically provided in the middle of the material leveling frame. A straightening push rod is provided on the lower side of the material leveling support frame, and the push head of the straightening push rod passes through the material leveling support frame and is fixed to a straightening push plate. A material leveling flipping mechanism is provided on the upper side of the material leveling support frame, which is used to rotate the sagger 180 degrees for material leveling.

[0008] Furthermore, the material leveling and turning mechanism includes a turning frame with a rectangular frame structure. The two sides of the turning frame are rotatably connected to the two sides of the material leveling support frame via turning shafts. A turning motor is mounted on the side of the material leveling support frame via a motor bracket. The motor shaft of the turning motor is fixed to the turning shaft via a coupling. Push rod beams are provided on both sides of the turning frame. A first longitudinal clamping push rod is provided on the upward side of the push rod beams, and a second longitudinal clamping push rod is provided on the downward side of the push rod beams. A first clamping vibrating material assembly is fixed on the push head of the first longitudinal clamping push rod, and a second clamping vibrating material assembly is fixed on the push head of the second longitudinal clamping push rod. The first clamping vibrating material assembly and the second clamping vibrating material assembly have the same structure.

[0009] Furthermore, the first clamping vibrating assembly includes a movable angle steel and a clamping push rod disposed on the movable angle steel. The push head of the clamping push rod passes through the side of the movable angle steel and the clamping channel steel and is fixed thereon. A vibrating base frame is disposed opposite to the side of the clamping channel steel. A vibrating plate is slidably fitted inside the vibrating base frame. A push rod channel is opened on the vibrating plate. The push head of the clamping push rod passes through the push rod channel. One end of the vibrating plate is fixed to the vibrating rope. The other end of the vibrating rope passes through the vibrating base frame and is fixed to a metal pulling plate. A vibrating spring is threaded on the vibrating rope between the vibrating plate and the vibrating base frame. The vibrating plate has a receiving groove corresponding to the pulling plate. An electromagnet corresponding to the pulling plate is disposed on the side of the movable angle steel. The electromagnet is used to attract the pulling plate.

[0010] Furthermore, a loosening base frame is provided across the transmission unit, and a loosening cylinder is provided on the upper side of the loosening base frame. The push head of the loosening cylinder extends downward through the loosening base frame and is fixed to the connecting pressure frame. The lower side of the connecting pressure frame is connected to the loosening component, which is used to dynamically switch the loosening mode according to the humidity characteristics of the rare earth polishing powder.

[0011] Furthermore, the loosening assembly includes a first loosening substrate on the upper side and a second loosening substrate on the lower side, which are fixed by a longitudinal connecting plate. A first loosening push rod is fixed on the first loosening substrate, and the push head of the first loosening push rod passes downward through the first loosening substrate and is fixed to the grid-shaped first loosening connecting plate. Several first loosening pillars with circular cross sections are provided on the lower side of the first loosening connecting plate, and the lower side of the first loosening pillars is slidably engaged with the second loosening substrate. A second loosening push rod is fixed on the first loosening substrate, and the push head of the second loosening push rod passes downward through the first loosening substrate and is fixed to the annular second loosening connecting plate. Nine second loosening pillars with square cross sections are provided on the lower side of the second loosening connecting plate, and the lower side of the second loosening pillars is slidably engaged with the second loosening substrate. A third loosening pillar corresponding to the second loosening pillars is provided on the lower side of the first loosening substrate, and corresponding mating channels are opened between the second loosening pillars and the second loosening connecting plate. The third loosening pillar is slidably engaged with the second loosening pillars and the second loosening connecting plate.

[0012] Furthermore, when the first loosening column extends and the second loosening column retracts, it switches to a low-moisture mode, and the first loosening column and the third loosening column combine to form a dense loosening surface; when the first loosening column retracts and the second loosening column extends, the second loosening column surrounds the third loosening column, switching to a high-moisture mode, forming a loosening surface with larger gaps.

[0013] Furthermore, the feeding unit includes a conveyor roller assembly corresponding to the conveying unit and a calcining kiln roller assembly corresponding to the first calcining kiln. A lifting and transferring assembly is provided between the conveyor roller assembly and the first calcining kiln. The conveyor roller assembly is used to convey the saggers transported by the conveying unit to the upper side of the lifting and transferring assembly. After the lifting and transferring assembly is raised, it transfers the saggers from the conveyor roller assembly to the calcining kiln roller assembly. The calcining kiln roller assembly is used to transport the saggers to the first calcining kiln.

[0014] Furthermore, the conveyor roller assembly includes conveyor legs and conveyor angle steel mounted on the conveyor legs. The conveyor rollers and conveyor angle steel are rotatably coupled. The shaft of one side of the conveyor roller extends out of the conveyor angle steel and is keyed to the driven bevel gear. The side of the conveyor angle steel is rotatably coupled to a drive shaft via a bearing seat. A drive bevel gear is keyed to the drive shaft, and the drive bevel gear meshes with the driven bevel gear. The conveyor legs are provided with a support beam. A conveyor motor is fixed to the support beam via a motor seat. A first drive gear is keyed to the motor shaft of the conveyor motor. A second drive gear corresponding to the first drive gear is provided on the drive shaft. The first drive gear and the second drive gear are connected by a first chain drive. The unloading unit has the same structure as the feeding unit.

[0015] Furthermore, the lifting and transfer assembly includes three fixed supports, one located below the conveyor roller assembly, another below the calcining kiln roller assembly, and the third between the conveyor roller assembly and the calcining kiln roller assembly. A height adjustment push rod is located on the lower side of the fixed support, with its push head extending upwards through the fixed support and fixed to the adjustment frame. A first transfer gear is rotatably fitted on the left adjustment frame, and a second transfer gear is rotatably fitted on the right adjustment frame. A transfer drive shaft is rotatably fitted on the middle adjustment frame, with four transfer drive gears keyed to it. Two of these transfer drive gears are connected to the first transfer gear via a second chain, and the remaining two transfer drive gears are connected to the second transfer gear via a third chain. A transfer drive motor for driving the rotation of the transfer drive shaft is located on the side of the middle adjustment frame.

[0016] The second aspect of this application discloses a rare earth polishing powder preparation process, which uses a high-penetration rare earth polishing powder calcination kiln as described above, and includes the following steps:

[0017] Step 1: Loading and loosening the material in the sagger;

[0018] Rare earth polishing powder to be calcined is added to the empty sagger from the side of the transmission unit; if the humidity is high, the first loosening push rod retracts and the second loosening push rod extends, so that the second loosening column extends to form a loose material surface with larger gaps; if the humidity is low, the first loosening push rod extends and the second loosening push rod retracts, so that the first loosening column and the third loosening column combine to form a dense square loosening surface; the loosening cylinder drives the loosening assembly to press down, loosening the material in the sagger.

[0019] Step 2: Sagger conveying and feeding;

[0020] The conveying unit transports the saggers carrying the material to the conveying roller assembly of the feeding unit. The conveying motor drives the conveying rollers to rotate synchronously, sending the saggers above the lifting and transfer assembly. The height adjustment push rod rises synchronously, and the second and third chains are tensioned and lift the bottom of the saggers. The transfer drive motor moves the saggers horizontally above the calcining kiln roller assembly through chain transmission. The height adjustment push rod descends, and the saggers fall into the calcining kiln roller assembly and are transported into the first calcining kiln.

[0021] Step 3, one calcination;

[0022] The rare earth polishing powder is calcined once in the first calcining kiln.

[0023] Step 4: Homogenization treatment after calcination;

[0024] After one calcination, the sagger is transferred to the transfer roller of the uniform material unit via the conveying roller of the first calcining kiln. The transfer motor drives the transfer roller to send the sagger into the middle area of ​​the uniform material frame. The upper support push rod rises to lift the sagger, and the lower push rod drives the sagger to fall to the ball bearing seat. The straightening push rod pushes the straightening push plate to position the sagger. The first and second longitudinal clamping push rods of the uniform material turning mechanism clamp the loaded sagger and the empty sagger respectively and connect them. The turning motor drives the turning frame to rotate 180 degrees to realize the material inversion uniform material distribution. The electromagnet is de-energized and the material vibration spring vibrates to prevent the material from sticking to the wall. After the uniform material distribution is completed, the upper support push rod resets and places the sagger back on the transfer roller. The transfer motor drives the transfer roller to transport the sagger to the second calcining kiln.

[0025] Step 5, secondary calcination;

[0026] Start the second calcining kiln to perform a second calcination treatment on the homogenized rare earth polishing powder.

[0027] Step Six: Unloading and Recycling;

[0028] After the second calcination is completed, the unloading unit (with the same structure as the feeding unit) transfers the loading sagger from the second calcination kiln to the transmission unit; the rare earth polishing powder that has been calcined in the sagger is recovered at the side of the transmission unit, and the rare earth polishing powder to be calcined is added to the empty sagger. The sagger that has been replenished is transported to the feeding unit again by the transmission unit to enter the next calcination cycle.

[0029] The beneficial effects achieved by this invention are as follows: the first clamping vibrating material assembly and the second clamping vibrating material assembly are placed opposite each other, and the sagger carrying rare earth polishing powder and the empty sagger are fixed by clamping channel steel respectively to form a double sagger docking structure. When flipped, the material is transferred inverted in the closed space, so that the rare earth polishing powder on the lower side is transferred to the upper position, thus achieving uniform material distribution. The extension and retraction of the first longitudinal clamping push rod not only realizes the clamping of the sagger, but also completes the compression and energy storage of the vibrating material spring by electromagnet adsorption and pulling plate during the clamping process, combining the clamping action and the energy storage action into one, without the need for an additional independent energy storage drive. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a calcining kiln for high-abrasion rare earth polishing powder.

[0031] Figure 2 This is a schematic diagram of the sagger uniform material unit structure of the present invention.

[0032] Figure 3 This is a schematic diagram of the upper support push rod and the upper support base plate of the present invention.

[0033] Figure 4 This is a schematic diagram of the upper support base plate and the upper support column of the present invention.

[0034] Figure 5This is a schematic diagram of the switching action of the upper support plate and the ball bearing seat in this invention.

[0035] Figure 6 This is a schematic diagram of the corrective push rod and corrective push plate structure of the present invention.

[0036] Figure 7 This is a schematic diagram of the material feeding and turning mechanism of the present invention. Figure 1 .

[0037] Figure 8 This is a schematic diagram of the material feeding and turning mechanism of the present invention. Figure 2 .

[0038] Figure 9 This is a schematic diagram of the structure of the first clamping vibrating material assembly of the present invention. Figure 1 .

[0039] Figure 10 This is a schematic diagram of the structure of the first clamping vibrating material assembly of the present invention. Figure 2 .

[0040] Figure 11 This is a schematic diagram of the docking of the sagger carrying rare earth polishing powder and an empty sagger according to the present invention.

[0041] Figure 12 This is a schematic diagram of the feeding unit structure of the present invention. Figure 1 .

[0042] Figure 13 This is a schematic diagram of the feeding unit structure of the present invention. Figure 2 .

[0043] Figure 14 This is a schematic diagram of the lifting and transferring component structure of the present invention. Figure 1 .

[0044] Figure 15 This is a schematic diagram of the lifting and transferring component structure of the present invention. Figure 2 .

[0045] Figure 16 This is a schematic diagram of the loose material base frame structure of the present invention.

[0046] Figure 17 This is a schematic diagram of the loosening component structure of the present invention. Figure 1 .

[0047] Figure 18 This is a schematic diagram of the loosening component structure of the present invention. Figure 2 .

[0048] Figure 19 This is a schematic diagram of the material loosening component switching of the present invention. Figure 1 .

[0049] Figure 20 This is a schematic diagram of the material loosening component switching of the present invention. Figure 2 .

[0050] In the diagram, 1. First calcining kiln; 2. Second calcining kiln; 3. Sagger; 4. Feeding support leg; 5. Feeding frame; 6. Transfer roller; 7. Transfer motor; 8. Upper support push rod; 9. Upper support base plate; 10. Upper support column; 11. Upper support plate; 12. Upper support connecting plate; 13. Lower moving frame; 14. Lower moving push rod; 15. Ball bearing seat; 16. Support column; 17. Feeding support frame; 18. Correcting push rod; 19. Correcting push plate; 20. Tilting frame; 21. 21. Tilting shaft; 22. Tilting motor; 23. Push rod crossbeam; 24. First longitudinal clamping push rod; 25. Second longitudinal clamping push rod; 26. Movable angle steel; 27. Clamping push rod; 28. Clamping channel steel; 29. ​​Vibrating base frame; 30. Vibrating plate; 31. Push rod channel; 32. Vibrating rope; 33. Pull plate; 34. Vibrating spring; 35. Receiving groove; 36. Electromagnet; 37. Transmission unit; 38. Transmission support leg; 39. Transmission angle steel; 40. Conveyor roller; 41. Driven bevel gear; 42. Drive shaft; 43. Driven bevel gear; 44. Support leg beam; 45. Conveyor motor; 46. First drive gear; 47. Second drive gear; 48. First chain; 49. Calcination kiln roller conveyor assembly; 50. Fixed bracket; 51. Height adjustment push rod; 52. Adjustment frame; 53. First transfer gear; 54. Second transfer gear; 55. Transfer drive shaft; 56. Transfer drive gear; 5 7. Second chain; 58. Third chain; 59. Transfer drive motor; 60. Unloading base frame; 61. Unloading cylinder; 62. Connecting pressure frame; 63. First unloading base plate; 64. Second unloading base plate; 65. Longitudinal connecting plate; 66. First unloading push rod; 67. First unloading connecting plate; 68. First unloading column; 69. Second unloading push rod; 70. Second unloading connecting plate; 71. Second unloading column; 72. Third unloading column; 73. Matching channel. Detailed Implementation

[0051] To facilitate understanding of the present invention by those skilled in the art, specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood through the specific circumstances.

[0053] like Figure 1As shown, this invention provides a high-abrasion-weight rare earth polishing powder calcining kiln, comprising a first calcining kiln 1 and a second calcining kiln 2 arranged sequentially. A sagger 3 uniform feeding unit is provided between the first calcining kiln 1 and the second calcining kiln 2. After the first calcining kiln 1 performs a first calcination on the rare earth polishing powder carried in the sagger 3, the sagger 3 uniform feeding unit is used to rotate and uniformly feed the rare earth polishing powder output from the first calcining kiln 1 and then transport it to the second calcining kiln 2 for a second calcination. A feeding unit is provided on the side of the first calcining kiln 1, and a discharging unit is provided on the side of the second calcining kiln 2. A transmission unit 37 is provided between the feeding unit and the discharging unit. The transmission unit 37 is an existing roller conveyor used to transport the sagger 3. The feeding unit is used to transfer the sagger 3 transported by the transmission unit 37 to the first calcining kiln 1, and the discharging unit is used to transfer the sagger 3 after calcination in the second calcining kiln 2 to the transmission unit 37. The calcined rare earth polishing powder is recovered on the side of the transmission unit 37, and rare earth polishing powder to be calcined is replenished into the sagger 3.

[0054] like Figure 2 As shown, the feeding unit of the sagger 3 includes feeding support legs 4 and a feeding frame 5 mounted on the feeding support legs 4. Transfer rollers 6 are respectively provided on both sides of the feeding frame 5, and the transfer rollers 6 correspond to the conveying rollers of the first calcining kiln 1 and the second calcining kiln 2. A transfer motor 7 is provided on the side of the transfer roller 6, and the transfer motor 7 is used to drive the transfer roller 6 to rotate; as shown... Figure 3-4 As shown, the material leveling frame 5 has upper support push rods 8 (either hydraulic or pneumatic) on both sides of its middle. The push head of the upper support push rod 8 extends upward through the material leveling frame 5 and is fixed to the upper support base plate 9. Several upper support columns 10 are slidably fitted onto the upper support base plate 9. The upper support columns 10 are spaced apart. An upper support plate 11 for supporting the sagger 3 is provided on the upper side of each upper support column 10. The lower side of each upper support column 10 is fixed to the upper support connecting plate 12. A lower moving frame 13 is provided on the lower side of the upper support base plate 9. A lower moving push rod 14 is provided on the lower side of the lower moving frame 13. The push head of the lower moving push rod 14 extends upward through the lower moving frame 13 and is fixed to the upper support connecting plate 12. Ball bearing seats 15 are spaced apart on the upper side of the upper support base plate 9. The ball bearing seats 15 are located between the upper support columns 10 and are fixed to the upper support base plate 9 by support columns 16. Figure 6 As shown, a material leveling frame 5 is vertically provided in the middle of a material leveling support frame 17. A correction push rod 18 is provided on the lower side of the material leveling support frame 17. The push head of the correction push rod 18 passes through the material leveling support frame 17 and is fixed to the correction push plate 19. A material leveling flipping mechanism is provided on the upper side of the material leveling support frame 17. The material leveling flipping mechanism is used to rotate the sagger 3 180 degrees to level the material.

[0055] like Figure 5As shown, after the first calcining kiln 1 completes one calcination, the sagger 3 carrying the rare earth polishing powder is transferred to the transfer roller 6 of the uniform material frame 5 via the conveying roller of the first calcining kiln 1. The transfer motor 7 drives the transfer roller 6 to rotate, smoothly feeding the sagger 3 into the middle area of ​​the uniform material frame 5. At this time, the upper support push rod 8 is activated, the upper support plate 9 rises as a whole, and the upper support plate 11 moves upward synchronously, lifting the sagger 3 from the surface of the transfer roller 6. The lower push rod 14 pushes the upper support connecting plate 12 to drive the upper support column 10 and the upper support plate 11 downward, causing the sagger 3 to fall onto the ball bearing seat 15. At this time, the sagger 3 and the ball bearing seat 15 are in rolling contact. The correction push rod 14 moves the upper support column 10 and the upper support plate 11 downward by pushing the upper support connecting plate 12, so that the sagger 3 falls onto the ball bearing seat 15. At this time, the sagger 3 and the ball bearing seat 15 are in rolling contact. Rod 18 drives the straightening push plate 19 to extend and push and straighten the position of the sagger 3 from the side, ensuring that the sagger 3 is located in the center gripping area of ​​the material uniforming and turning mechanism; then the material uniforming and turning mechanism clamps the sagger 3 and rotates it 180 degrees around the horizontal axis, so that the primary calcined material accumulated in the sagger 3 is turned upside down as a whole; after the material uniforming is completed, the material uniforming and turning mechanism releases the sagger 3 onto the upper support plate 11; the upper support push rod 8 retracts, and the upper support plate 11 moves down synchronously, placing the sagger 3 onto the transfer roller 6; finally, the transfer motor 7 drives the transfer roller 6 to rotate, conveying the uniformly uniform sagger 3 to the input end of the second calcining kiln 2 for secondary calcination.

[0056] like Figure 7-8 As shown, the material leveling and turning mechanism includes a rectangular frame turning frame 20. The two sides of the turning frame 20 are rotatably connected to the two sides of the material leveling support frame 17 via turning shafts 21. A turning motor 22 is mounted on the side of the material leveling support frame 17 via a motor bracket. The motor shaft of the turning motor 22 is fixed to the turning shaft 21 via a coupling. Push rod beams 23 are respectively provided on both sides of the turning frame 20. A first longitudinal clamping push rod 24 is provided upwards on the push rod beams 23, and a second longitudinal clamping push rod 25 is provided downwards on the push rod beams 23. A first clamping vibrating material assembly is fixed to the push head of the first longitudinal clamping push rod 24, and a second clamping vibrating material assembly is fixed to the push head of the second longitudinal clamping push rod 25. The first and second clamping vibrating material assemblies have the same structure. Figure 9-10 As shown, the first clamping vibratory feed assembly includes a movable angle steel 26 and a clamping push rod 27 disposed on the movable angle steel 26. The push head of the clamping push rod 27 passes through the movable angle steel 26 and is fixed to the side of the clamping channel steel 28, which is used to clamp the bottom of the crucible 3. A vibratory feed base 29 is provided opposite to the side of the clamping channel steel 28. A vibratory feed plate 30 is slidably fitted inside the vibratory feed base 29. A push rod channel 31 is provided on the vibratory feed plate 30, through which the push head of the clamping push rod 27 passes. The rod channel 31; the vibrating plate 30 is fixed to one end of the vibrating rope 32, and the other end of the vibrating rope 32 passes through the vibrating base frame 29 and is fixed to the metal pull plate 33. A vibrating spring 34 is threaded on the vibrating rope 32 between the vibrating plate 30 and the vibrating base frame 29; the vibrating plate 30 has a receiving groove 35 corresponding to the pull plate 33; the side of the movable angle steel 26 is provided with an electromagnet 36 corresponding to the pull plate 33, and the electromagnet 36 is used to attract the pull plate 33.

[0057] Combination Figure 9-11 After the sagger 3 is lifted and positioned by the upper support plate 11, the first longitudinal clamping push rod 24 is activated, pushing the first clamping vibrating material assembly downwards. The clamping push rod 27 drives the clamping channel steel 28 to extend and clamp the bottom surface of the sagger 3 carrying rare earth polishing powder. During the extension of the clamping push rod 27, the electromagnet 36 attracts the metal pulling plate 33, and the clamping channel steel 28 drives the vibrating material base frame 29 to move inwards. The pulling plate 33 keeps the vibrating material plate 30 in place through the vibrating material rope 32, reducing the gap between the vibrating material base frame 29 and the vibrating material plate 30, and compressing the vibrating material spring 34. The first longitudinal clamping push rod 24 retracts, and the sagger 3 carrying rare earth polishing powder moves upwards. The first part moves and connects with the empty cassette 3 held by the second clamping vibrating material assembly; then the flipping motor 22 drives the flipping frame 20 to flip 180 degrees, the cassette 3 carrying rare earth polishing powder flips to the upper side, and the empty cassette 3 flips to the lower side; the rare earth polishing powder in the cassette 3 is placed upside down in the empty cassette 3 under the action of gravity, so as to achieve uniform material distribution; at this time, the electromagnet 36 is de-energized, the vibrating spring 34 releases elastic potential energy instantly, pushes the vibrating plate 30 to quickly reset and hit the clamping channel steel 28, and the vibration is transmitted to the inside of the cassette 3 to avoid a small part of the rare earth polishing powder sticking to the wall and remaining in the upper cassette 3. The second longitudinal clamping push rod 25 drives the cassette 3 to move downward and place the cassette 3 on the upper support plate 11.

[0058] The beneficial effects of the material-balancing and flipping mechanism are as follows: the first clamping and vibrating material assembly and the second clamping and vibrating material assembly are positioned opposite each other, and the sagger 3 carrying rare earth polishing powder and the empty sagger 3 are respectively fixed by the clamping channel steel 28, forming a double-sagger docking structure. When flipping, the material is transferred inverted in the closed space, so that the rare earth polishing powder on the lower side is transferred to the upper position. The extension and retraction of the first longitudinal clamping push rod 24 not only realizes the clamping of the sagger 3, but also, during the clamping process, the electromagnet 36 attracts the pull plate 33 to simultaneously complete the compression and energy storage of the vibrating material spring 34, combining the clamping action and the energy storage action into one, without the need for an additional independent energy storage drive.

[0059] The feeding unit is used to transfer the sagger 3 conveyed by the transfer unit 37 to the first calcining kiln 1, such as... Figure 12-13As shown, the feeding unit includes a conveyor roller assembly corresponding to the conveyor unit 37 and a calcining kiln roller assembly 49 corresponding to the first calcining kiln 1. A lifting and transferring assembly is provided between the conveyor roller assembly and the first calcining kiln 1. The conveyor roller assembly is used to convey the sagger 3 conveyed by the conveyor unit 37 to the upper side of the lifting and transferring assembly. After the lifting and transferring assembly is raised, it transfers the sagger 3 from the conveyor roller assembly to the calcining kiln roller assembly 49. The calcining kiln roller assembly 49 is used to convey the sagger 3 to the first calcining kiln 1. The conveyor roller assembly includes a conveyor leg 38 and a conveyor angle steel 39 disposed on the conveyor leg 38. The conveyor roller 40 is rotatably engaged with the conveyor angle steel 39. The rotation of one side of the conveyor roller 40... A transmission angle steel 39 extends from the shaft and is keyed to the driven bevel gear 41. The side of the transmission angle steel 39 is rotatably fitted with a drive shaft 42 via a shaft seat. A drive bevel gear 43 is keyed to the drive shaft 42, and the drive bevel gear 43 meshes with the driven bevel gear 41. A support leg 38 is provided with a support leg beam 44. A transmission motor 45 is fixed to the support leg beam 44 via a motor seat. A first drive gear 46 is keyed to the motor shaft of the transmission motor 45. A second drive gear 47 corresponding to the first drive gear 46 is provided on the drive shaft 42. The first drive gear 46 and the second drive gear 47 are connected by a first chain 48, and the transmission motor 45 drives the transmission roller 40 to rotate synchronously. Figure 14-15 As shown, the lifting and transfer assembly includes three fixed supports 50, one of which is located on the lower side of the conveyor roller assembly, another on the lower side of the calcining kiln roller assembly 49, and the third is located between the conveyor roller assembly and the calcining kiln roller assembly 49; a height adjustment push rod 51 is provided on the lower side of the fixed support 50, and the push head of the height adjustment push rod 51 extends upward through the fixed support 50 and is fixed to the adjustment frame 52; a first transfer gear 53 is rotatably engaged on the left adjustment frame 52, and a second transfer gear 54 is rotatably engaged on the right adjustment frame 52;

[0060] The middle adjusting frame 52 is rotatably fitted with a transfer drive shaft 55, and four transfer drive gears 56 are keyed to the transfer drive shaft 55. Two of the transfer drive gears 56 are connected to the first transfer gear 53 via a second chain 57, and the remaining two transfer drive gears 56 are connected to the second transfer gear 54 via a third chain 58. The middle adjusting frame 52 is provided with a transfer drive motor 59 on its side for driving the transfer drive shaft 55 to rotate. The unloading unit is used to transfer the sagger 3 after calcination in the second calcining kiln 2 to the transmission unit 37. The unloading unit has the same structure as the feeding unit.

[0061] The transmission unit 37 delivers the sagger 3 carrying rare earth polishing powder to the transmission roller assembly at the same height as its own roller surface. The transmission motor 45 drives the drive shaft 42 to rotate via the first drive gear 46 and the first chain 48. The driving bevel gear 43 on the drive shaft 42 simultaneously meshes with the driven bevel gear 41, causing all the transmission rollers 40 to rotate in the same direction and at the same speed. Under the action of friction, the sagger 3 is smoothly delivered above the lifting and transfer assembly. The height adjustment push rods 51 on the three fixed supports 50 rise simultaneously, pushing the adjustment frame 52 at the corresponding position upward as a whole. The first transfer gear 53, the second transfer gear 54, and the four transfer drive gears 56 in the middle rise together with the adjustment frame 52. The second chain 57 is tensioned and supports the sagger 52. The bottom surface of the sagger 3 is lifted off the roller surface of the conveyor roller assembly; the transfer drive motor 59 starts, driving the transfer drive shaft 55 to rotate, and the sagger 3 is horizontally moved above the calcining kiln roller assembly 49 under the support of the second chain 57 and the third chain 58; then the height adjustment push rod 51 descends synchronously, and the sagger 3 falls onto the roller surface of the calcining kiln roller assembly 49. The calcining kiln roller assembly 49 continues to feed the sagger 3 into the first calcining kiln 1 to complete one calcination; the unloading unit adopts a structure that is completely symmetrical with the feeding unit. After the second calcining kiln 2 completes the second calcination, the sagger 3 is transferred from the calcining kiln roller assembly 49 to the conveyor roller assembly by the lifting and transferring assembly along the opposite path, and finally returns to the conveying unit 37.

[0062] In the pretreatment process of rare earth polishing powder before calcination, in order to further ensure the drying effect, it is necessary to manually use tools to repair the material into a loose and porous state to ensure uniform and sufficient drying. However, the moisture content of rare earth polishing powder varies greatly. High-moisture rare earth polishing powder has a certain stickiness and easily adheres to the loosening device. To solve this problem, different loosening mechanisms are used for rare earth polishing powder with different moisture contents; for example... Figure 16 As shown, a loosening base frame 60 is horizontally mounted on the transmission unit 37. A loosening cylinder 61 is mounted on the upper side of the loosening base frame 60. The push head of the loosening cylinder 61 extends downward through the loosening base frame 60 and is fixed to the connecting pressure frame 62. The lower side of the connecting pressure frame 62 is connected to the loosening assembly. Figure 17-18As shown, the loosening assembly includes a first loosening substrate 63 on the upper side and a second loosening substrate 64 on the lower side. The first loosening substrate 63 and the second loosening substrate 64 are fixed by a longitudinal connecting plate 65. A first loosening push rod 66 is fixed on the first loosening substrate 63. The push head of the first loosening push rod 66 extends downward through the first loosening substrate 63 and is fixed to a grid-shaped first loosening connecting plate 67. The lower side of the first loosening connecting plate 67 is provided with several first loosening columns 68 with circular cross sections. The lower side of the first loosening columns 68 is slidably engaged with the second loosening substrate 64. A second loosening push rod 69 is fixed on the first loosening substrate 63. The push head of the second loosening push rod 69 extends downward through the first loosening substrate 63 and is fixed to an annular second loosening connecting plate 70. Nine square-section second loosening columns 71 are provided on the lower side of the loosening plate 70. The lower side of the second loosening column 71 is slidably engaged with the second loosening base plate 64. The lower side of the first loosening base plate 63 is provided with a third loosening column 72 corresponding to the second loosening column 71. The second loosening column 71 and the second loosening plate 70 are provided with corresponding mating channels 73. The third loosening column 72 is slidably engaged with the second loosening column 71 and the second loosening plate 70. When the first loosening column 68 extends and the second loosening column 71 retracts, the first loosening column 68 and the third loosening column 72 combine to form a dense loosening surface. When the first loosening column 68 retracts and the second loosening column 71 extends, the second loosening column 71 surrounds the third loosening column 72 to form a loosening surface with larger gaps.

[0063] like Figures 19-20 As shown, when the rare earth polishing powder has high moisture content and is sticky, the first loosening push rod 66 retracts, the first loosening column 68 retracts, and the second loosening push rod 69 drives the annular second loosening connecting plate 70 to descend, causing the nine square-section second loosening columns 71 to extend downwards. The annular arrangement of the second loosening columns 71 surrounds the third loosening column 72, forming a loosening surface with larger gaps. When the loosening cylinder 61 presses down, the larger gaps between the columns provide more flow space for the material and reduce material adhesion. When the rare earth polishing powder is detected to have low moisture content, the first loosening push rod 66 drives the grid-shaped first loosening connecting plate 67 to descend, causing the circular-section first loosening column 68 to extend downwards, while the second loosening push rod 69... With rod 69 in a retracted state, the second loosening column 71 with a square cross-section retracts into the second loosening substrate 64. At this time, the first loosening column 68 and the third loosening column 72, which slides inside it, combine to form a square loosening surface. The loosening cylinder 61 presses down, and the square loosening column array is inserted into the material. The dense column contact area is used to divide the material into small unit blocks, ensuring uniform and sufficient drying. By switching between the extension and retraction of the first loosening column 68 and the second loosening column 71, the density of the loosening surface is dynamically adjusted. For rare earth polishing powder with different humidity characteristics, a dense or loose loosening mode is selected, which solves the problem that a single loosening mechanism cannot simultaneously take into account high humidity anti-sticking and low humidity breathability.

[0064] The second aspect of this application discloses a rare earth polishing powder preparation process, comprising the following steps:

[0065] Step 1: Loading and loosening the material in sagger 3;

[0066] Rare earth polishing powder to be calcined is added to the empty sagger 3 from the side of the transmission unit 37; if the humidity is high, the first loosening push rod 66 retracts and the second loosening push rod 69 extends, so that the second loosening column 71 extends to form a loose material surface with larger gaps; if the humidity is low, the first loosening push rod 66 extends and the second loosening push rod 69 retracts, so that the first loosening column 68 and the third loosening column 72 combine to form a dense square loose material surface; the loosening cylinder 61 drives the loosening assembly to press down, loosening the material in the sagger 3;

[0067] Step 2: Conveying and feeding the sagger 3;

[0068] The conveying unit 37 transports the sagger 3 carrying the material to the conveying roller assembly of the feeding unit. The conveying motor 45 drives the conveying roller 40 to rotate synchronously, sending the sagger 3 above the lifting and transfer assembly. The height adjustment push rod 51 rises synchronously, and the second chain 57 and the third chain 58 are tensioned and lift the bottom surface of the sagger 3. The transfer drive motor 59 moves the sagger 3 horizontally above the calcining kiln roller assembly 49 through chain transmission. The height adjustment push rod 51 descends, and the sagger 3 falls into the calcining kiln roller assembly 49 and is transported into the first calcining kiln 1.

[0069] Step 3, one calcination;

[0070] The rare earth polishing powder is calcined once in the first calcining kiln 1 in the sagger 3.

[0071] Step 4: Homogenization treatment after calcination;

[0072] After one calcination, the sagger 3 is transferred to the transfer roller 6 of the uniform material unit via the conveying roller of the first calcining kiln 1. The transfer motor 7 drives the transfer roller 6 to send the sagger 3 into the middle area of ​​the uniform material frame 5. The upper support push rod 8 rises to lift the sagger 3, and the lower push rod 14 drives the sagger 3 to fall to the ball bearing seat 15. The straightening push rod 18 pushes the straightening push plate 19 to position the sagger 3. The first and second longitudinal clamping push rods 25 of the uniform material turning mechanism clamp the loaded sagger 3 and the empty sagger 3 respectively and connect them. The turning motor 22 drives the turning frame 20 to rotate 180 degrees to realize the material inversion uniform material distribution. The electromagnet 36 is de-energized and vibrates through the vibrating spring 34 to prevent the material from sticking to the wall. After the uniform material distribution is completed, the upper support push rod 8 resets and places the sagger 3 back onto the transfer roller 6. The transfer motor 7 drives the transfer roller 6 to transport the sagger 3 to the second calcining kiln 2.

[0073] Step 5, secondary calcination;

[0074] Start the second calcining kiln 2 to perform a second calcination treatment on the homogenized rare earth polishing powder;

[0075] Step Six: Unloading and Recycling;

[0076] After the second calcination is completed, the unloading unit (with the same structure as the feeding unit) transfers the loading sagger 3 from the second calcination kiln 2 to the transmission unit 37; the rare earth polishing powder that has been calcined in the sagger 3 is recovered on the side of the transmission unit 37, and the rare earth polishing powder to be calcined is added to the empty sagger 3. The sagger 3 that has been replenished is transported to the feeding unit again by the transmission unit 37 to enter the next calcination cycle.

[0077] Unless otherwise specified, the above methods of fixing all use common technical means employed by industry professionals, such as welding, nesting, or threaded fixing.

[0078] The following points need to be explained:

[0079] The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0080] For clarity, the thickness of layers or regions is enlarged or reduced in the accompanying drawings used to describe embodiments of the invention; that is, these drawings are not drawn to scale. It is understood that when an element such as a layer, film, region, or substrate is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element, or there may be intermediate elements present.

[0081] Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0082] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-abrasion-weight rare earth polishing powder calcining kiln, characterized in that, The system includes a first calcining kiln (1) and a second calcining kiln (2) arranged sequentially, with a sagger (3) uniform material unit between the first calcining kiln (1) and the second calcining kiln (2); a feeding unit is provided on the side of the first calcining kiln (1), and a discharging unit is provided on the side of the second calcining kiln (2), with a transmission unit (37) between the feeding unit and the discharging unit; the sagger (3) uniform material unit includes a uniform material support leg (4) and a uniform material frame (5) provided on the uniform material support leg (4), with transfer rollers (6) provided on both sides of the uniform material frame (5), and the transfer rollers (6) corresponding to the conveying rollers of the first calcining kiln (1) and the second calcining kiln (2); a transfer motor (7) is provided on the side of the transfer roller (6), and the transfer motor (7) is used to drive the rotation. The transfer roller (6) rotates; the middle two sides of the uniform frame (5) are provided with upper support push rods (8), the push head of the upper support push rod (8) passes upward through the uniform frame (5) and is fixed to the upper support base plate (9); a number of upper support columns (10) are slidably fitted on the upper support base plate (9), the upper support columns (10) are spaced apart, the upper side of the upper support column (10) is provided with an upper support plate (11) for lifting the sagger (3), the lower side of the upper support column (10) is fixed to the upper support connecting plate (12), the lower side of the upper support base plate (9) is provided with a lower moving frame (13), the lower side of the lower moving frame (13) is provided with a lower moving push rod (14), the push head of the lower moving push rod (14) passes upward through the lower moving frame (13) and is fixed to the upper support connecting plate (12); the upper side of the upper support base plate (9) is spaced apart There is a ball bearing seat (15), which is located between the upper support columns (10); a uniform material support frame (17) is vertically provided in the middle of the uniform material frame (5), and a straightening push rod (18) is provided on the lower side of the uniform material support frame (17). The push head of the straightening push rod (18) passes through the uniform material support frame (17) and is fixed to the straightening push plate (19); a uniform material flipping mechanism is provided on the upper side of the uniform material support frame (17). The uniform material flipping mechanism is used to rotate the sagger (3) 180 degrees for uniform material distribution; the uniform material flipping mechanism includes a rectangular frame flipping frame (20). The two sides of the flipping frame (20) are rotatably connected to the two sides of the uniform material support frame (17) through the flipping shaft (21). The side of the uniform material support frame (17) is mounted on the motor bracket. The rotating frame (20) is equipped with a rotating motor (22), and the motor shaft of the rotating motor (22) is fixed to the rotating shaft (21) by a coupling. The two sides of the rotating frame (20) are respectively provided with push rod beams (23). The push rod beams (23) are provided with a first longitudinal clamping push rod (24) on the upper side and a second longitudinal clamping push rod (25) on the lower side. The first longitudinal clamping push rod (24) is fixed with a first clamping vibrating material assembly, and the second longitudinal clamping push rod (25) is fixed with a second clamping vibrating material assembly. The first clamping vibrating material assembly and the second clamping vibrating material assembly have the same structure. The first clamping vibrating material assembly and the second clamping vibrating material assembly are respectively used to clamp the sagger (3) containing rare earth polishing powder and the empty sagger (3).The first clamping vibrating assembly includes a movable angle steel (26) and a clamping push rod (27) disposed on the movable angle steel (26). The push head of the clamping push rod (27) passes through the movable angle steel (26) and is fixed to the side of the clamping channel steel (28). A vibrating base frame (29) is provided opposite to the side of the clamping channel steel (28). A vibrating plate (30) is slidably fitted inside the vibrating base frame (29). A push rod channel (31) is opened on the vibrating plate (30), and the push head of the clamping push rod (27) passes through the push rod channel (31). One end of the vibrating plate (30) is fixed to the vibrating rope (32), and the other end of the vibrating rope (32) passes through the vibrating base frame (29) and is fixed to the metal pull plate (33). A vibrating spring (34) is threaded on the vibrating rope (32) between the vibrating plate (30) and the vibrating base frame (29). The vibrating plate (30) has a receiving groove (35) corresponding to the pull plate (33). The side of the movable angle steel (26) is provided with an electromagnet (36) corresponding to the pull plate (33), and the electromagnet (36) is used to attract the pull plate (33).

2. The high-abrasion-weight rare earth polishing powder calcining kiln according to claim 1, characterized in that, The transmission unit (37) is provided with a loosening base frame (60) spanning across it. A loosening cylinder (61) is provided on the upper side of the loosening base frame (60). The push head of the loosening cylinder (61) passes down through the loosening base frame (60) and is fixed to the connecting pressure frame (62). The lower side of the connecting pressure frame (62) is connected to the loosening assembly. The loosening assembly is used to dynamically switch the loosening mode according to the humidity characteristics of the rare earth polishing powder.

3. The high-abrasion-weight rare earth polishing powder calcining kiln according to claim 2, characterized in that, The loosening assembly includes a first loosening substrate (63) on the upper side and a second loosening substrate (64) on the lower side. The first loosening substrate (63) and the second loosening substrate (64) are fixed by a longitudinal connecting plate (65). A first loosening push rod (66) is fixed on the first loosening substrate (63). The push head of the first loosening push rod (66) extends downward through the first loosening substrate (63) and is fixed to a grid-shaped first loosening connecting plate (67). A plurality of first loosening columns (68) with circular cross sections are provided on the lower side of the first loosening connecting plate (67). The lower side of the first loosening columns (68) slides with the second loosening substrate (64). A second loosening push rod is fixed on the first loosening substrate (63). Material pusher (69), the push head of the second material pusher (69) passes downward through the first material loosening base plate (63) and is fixed to the annular second material loosening connecting plate (70); the lower side of the second material loosening connecting plate (70) is provided with nine square cross-section second material loosening columns (71), the lower side of the second material loosening column (71) is slidably engaged with the second material loosening base plate (64), the lower side of the first material loosening base plate (63) is provided with a third material loosening column (72) corresponding to the second material loosening column (71), the second material loosening column (71) and the second material loosening connecting plate (70) are provided with corresponding engagement channels (73), the third material loosening column (72) is slidably engaged with the second material loosening column (71) and the second material loosening connecting plate (70).

4. The high-abrasion-weight rare earth polishing powder calcining kiln according to claim 3, characterized in that, When the first loosening column (68) extends and the second loosening column (71) retracts, it switches to a low-humidity mode. The first loosening column (68) and the third loosening column (72) combine to form a dense loosening surface. When the first loosening column (68) retracts and the second loosening column (71) extends, the second loosening column (71) surrounds the third loosening column (72), switching to a high-humidity mode and forming a loosening surface with larger gaps.

5. A high-abrasion-weight rare earth polishing powder calcining kiln according to claim 4, characterized in that, The feeding unit includes a conveying roller assembly corresponding to the conveying unit (37) and a calcining kiln roller assembly (49) corresponding to the first calcining kiln (1). A lifting and transferring assembly is provided between the conveying roller assembly and the first calcining kiln (1). The conveying roller assembly is used to convey the sagger (3) conveyed by the conveying unit (37) to the upper side of the lifting and transferring assembly. After the lifting and transferring assembly is raised, the sagger (3) is transferred from the conveying roller assembly to the calcining kiln roller assembly (49). The calcining kiln roller assembly (49) is used to convey the sagger (3) to the first calcining kiln (1).

6. The high-abrasion-weight rare earth polishing powder calcining kiln according to claim 5, characterized in that, The conveyor roller assembly includes a conveyor leg (38) and a conveyor angle steel (39) disposed on the conveyor leg (38). The conveyor roller (40) and the conveyor angle steel (39) are rotatably engaged. The shaft of one side of the conveyor roller (40) extends out of the conveyor angle steel (39) and is keyed to the driven bevel gear (41). The side of the conveyor angle steel (39) is rotatably engaged with a drive shaft (42) via a bearing seat. A drive bevel gear (43) is keyed to the drive shaft (42). The drive bevel gear (43) and the driven bevel gear (41) are keyed to each other. 41) Engagement; The transmission leg (38) is provided with a support leg beam (44), and the support leg beam (44) is fixed with a transmission motor (45) by a motor seat. The motor shaft of the transmission motor (45) is keyed with a first drive gear (46), and the drive shaft (42) is provided with a second drive gear (47) corresponding to the first drive gear (46). The first drive gear (46) and the second drive gear (47) are connected by a first chain (48). The unloading unit and the feeding unit have the same structure.

7. A high-abrasion-weight rare earth polishing powder calcining kiln according to claim 6, characterized in that, The lifting and transfer assembly includes three fixed supports (50), one of which is located below the conveyor roller assembly, another below the calcining kiln roller assembly (49), and the third between the conveyor roller assembly and the calcining kiln roller assembly (49). A height adjustment push rod (51) is provided on the lower side of each fixed support (50). The push head of the height adjustment push rod (51) extends upward through the fixed support (50) and is fixed to the adjustment frame (52). A first transfer gear (53) is rotatably engaged on the left adjustment frame (52), and a first transfer gear (53) is rotatably engaged on the right adjustment frame (52). The second transfer gear (54); the middle adjustment frame (52) is rotatably fitted with a transfer drive shaft (55), and four transfer drive gears (56) are keyed to the transfer drive shaft (55). Two of the transfer drive gears (56) are connected to the first transfer gear (53) through the second chain (57), and the remaining two transfer drive gears (56) are connected to the second transfer gear (54) through the third chain (58); the middle adjustment frame (52) is provided with a transfer drive motor (59) on the side for driving the transfer drive shaft (55) to rotate.

8. A rare earth polishing powder preparation process, using the high-etching rare earth polishing powder calcination kiln as described in claim 7, comprising the following steps: Step 1, feeding and loosening of materials in the sagger (3); Rare earth polishing powder to be calcined is added to the empty sagger (3) from the side of the transmission unit (37); if the humidity is high, the first loosening push rod (66) is retracted and the second loosening push rod (69) is extended, so that the second loosening column (71) extends to form a loose loosening surface with larger gaps; if the humidity is low, the first loosening push rod (66) is extended and the second loosening push rod (69) is retracted, so that the first loosening column (68) and the third loosening column (72) are combined to form a dense square loosening surface; the loosening cylinder (61) drives the loosening assembly to press down and loosen the material in the sagger (3); Step 2, conveying and feeding the sagger (3); The transmission unit (37) transports the sagger (3) carrying the material to the transmission roller assembly of the feeding unit. The transmission motor (45) drives the transmission roller (40) to rotate synchronously, sending the sagger (3) above the lifting and transfer assembly. The height adjustment push rod (51) rises synchronously, and the second chain (57) and the third chain (58) are tensioned and lift the bottom surface of the sagger (3). The transfer drive motor (59) moves the sagger (3) horizontally above the calcining kiln roller assembly (49) through chain transmission. The height adjustment push rod (51) descends, and the sagger (3) falls into the calcining kiln roller assembly (49) and is transported into the first calcining kiln (1). Step 3, one calcination; The rare earth polishing powder is calcined once in the first calcining kiln (1) in the sagger (3); Step 4: Homogenization treatment after calcination; After one calcination, the sagger (3) is transferred from the first calcination kiln (1) to the transfer roller (6) of the uniform material unit. The transfer motor (7) drives the transfer roller (6) to send the sagger (3) into the middle area of ​​the uniform material frame (5). The upper push rod (8) lifts up the sagger (3), and the lower push rod (14) drives the sagger (3) to fall to the ball bearing seat (15). The straightening push rod (18) pushes the straightening push plate (19) to position the sagger (3). The first and second uniform material turning mechanisms Two longitudinal clamping push rods (25) clamp the loaded sagger (3) and the empty sagger (3) respectively and connect them. The flipping motor (22) drives the flipping frame (20) to rotate 180 degrees to realize the material inversion and uniform feeding. The electromagnet (36) is de-energized and vibrates through the vibrating spring (34) to prevent the material from sticking to the wall. After the uniform feeding is completed, the upper push rod (8) is reset to place the sagger (3) back into the transfer roller (6). The transfer motor (7) drives the transfer roller (6) to transport the sagger (3) to the second calcining kiln (2). Step 5, secondary calcination; Start the second calcining kiln (2) to perform a second calcination treatment on the homogenized rare earth polishing powder; Step Six: Unloading and Recycling; After the second calcination is completed, the unloading unit transfers the loading sagger (3) from the second calcination kiln (2) to the transmission unit (37); the rare earth polishing powder that has been calcined in the sagger (3) is recovered at the side of the transmission unit (37), and the rare earth polishing powder to be calcined is added to the empty sagger (3). The sagger (3) that has been replenished is transported to the feeding unit again with the transmission unit (37) to enter the next round of calcination cycle.

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