Powder concentrator for calcium carbonate powder production

Abstract

The invention relates to the technical field of calcium carbonate powder production equipment, and discloses a powder concentrator for calcium carbonate powder production, which comprises a layered screening mechanism and an elastic supporting mechanism, a bottom supporting base capable of being placed on the ground, a top supporting base plate located over the bottom supporting base and capable of indirectly achieving a height supporting effect on the rectangular hollow shell and a first spiral spring installed between the bottom supporting base and the top supporting base plate and achieving an elastic supporting function are arranged in the rectangular hollow shell. The powder concentrator for calcium carbonate powder production is used in cooperation with a vibration motor with an eccentric wheel, so that calcium carbonate powder slides down in an inclined plane motion mode, in the sliding-down process, a vibrating filter plate can enable the calcium carbonate powder to be separated layer by layer in the shaking and falling process, and the calcium carbonate powder is prevented from falling off. And the calcium carbonate powder can have a larger screening area, so that the effective screening effect on the calcium carbonate powder is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of calcium carbonate powder production equipment, and particularly to a powder separator for calcium carbonate powder production. Background Art

[0002] During the production process, the separation of calcium carbonate powders with different finenesses is a very important step. Through separation, products of different specifications can be collected. On the other hand, powders with fineness not meeting the requirements need to be returned to the crushing mechanism, re-crushed, and then enter the powder separator for sorting. In the prior art, only one particle size of powder can be selected within one process, that is, powders not meeting the fineness requirements are removed through a filtering structure and returned to the crushing mechanism. This method not only has low efficiency, but also makes the process cumbersome, significantly increases the corresponding equipment and the required elevators, and also increases the dust removal work in the workshop. Moreover, the existing filtering structure (especially when strictly separating powders of a certain fineness) is prone to clogging, requires frequent maintenance, and affects the separation quality and continuous production operation.

[0003] Therefore, the Chinese patent with the publication number "CN112570263A" discloses a "powder separator for calcium carbonate powder production". Its main structure includes a plurality of separation mechanisms connected in series. The separation mechanism includes a separation cylinder, a feeding hopper, a thick discharge pipe, and a fine discharge pipe. A rotating cylinder is rotatably connected inside the separation cylinder. Two shielding and filtering structures are arranged outside the rotating cylinder. The shielding and filtering structure includes an arc-shaped shielding piece close to the inner wall of the separation cylinder, a connecting rod connecting the shielding piece and the outer wall of the rotating cylinder, and a mounting frame radially arranged in the material chamber. A plurality of telescopic components are arranged between the mounting frame and the connecting rod. A filter screen is arranged in the middle of the mounting frame. A driving cylinder is rotatably connected inside the rotating cylinder, and the driving cylinder is connected to a driving motor. The series connection method of the plurality of separation mechanisms is as follows: the fine discharge pipe of one separation mechanism is connected to the feeding hopper of the subsequent separation mechanism. When this powder separator for calcium carbonate powder production is working, when the powder that cannot pass through and accumulates on the filter screen in the working position accumulates to a certain amount, the second electromagnet can be actively controlled to cut off the power, or the current flow of the second electromagnet can be reduced to make the second adsorption block separate from the second electromagnet, or the second adsorption block can be separated from the second electromagnet due to the weight bearing of the filter screen. Then the rotating cylinder starts to rotate. During the rotation of the rotating cylinder, the two shielding pieces first close the outlet of the feeding hopper and the inlet of the fine discharge pipe respectively, and then open the thick discharge pipe while keeping the outlet of the feeding hopper closed, so that the coarse powder above the filter screen enters the thick discharge pipe. After the coarse powder is discharged, the two shielding pieces reset to the state where the rotating cylinder stops. Such a cycle is carried out to achieve powder screening.

[0004] However, when the powder separator for producing calcium carbonate powder works in practice, since the area where the powder moves is a semi - structure of a cylindrical area, some relatively fine powders will accumulate on the inner circumferential wall of the separation cylinder close to the selection cylinder under the action of gravity. The fine powders in this area cannot contact the filter screen structure. Therefore, they will be directly discharged through the discharge port, resulting in the inability to separate some fine powders from the larger powders, and thus reducing the screening effect. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a powder separator for producing calcium carbonate powder. When used in cooperation with a vibration motor with an eccentric wheel, the calcium carbonate powder slides down in an oblique - plane movement mode. During the sliding process, the vibrating filter plate enables the calcium carbonate powder to be separated layer by layer during the jitter - dropping process, enabling the calcium carbonate powder to have a larger screening area, thereby improving the effective screening effect on the calcium carbonate powder and solving the above - mentioned technical problems.

[0006] To achieve the above object, the present invention provides the following technical solution: A powder separator for producing calcium carbonate powder includes a layered screening mechanism, and inside there is a rectangular hollow housing whose top can install a vibration motor with an eccentric wheel, a plurality of rectangular screening plates installed at equal intervals inside the rectangular hollow housing and capable of screening calcium carbonate powder, and a feeding protection plate arranged at the head of the top - most rectangular screening plate and used for feeding calcium carbonate powder; and an elastic support mechanism, inside which there is a bottom support base that can be placed on the ground, a top support substrate located directly above the bottom support base and capable of indirectly supporting the height of the rectangular hollow housing, and a first helical spring installed between the bottom support base and the top support substrate and functioning as an elastic support.

[0007] Preferably, the layered screening mechanism includes a rectangular hollow housing. The inside of the rectangular hollow housing is provided with a rectangular hollow cavity with both ends open. The two sides of the rectangular hollow housing are provided with first connecting plates integrally formed with it. Inside the rectangular hollow housing and located from top to bottom in the rectangular hollow cavity, a plurality of rectangular screening plates are installed in sequence. Each rectangular screening plate is internally provided with a plurality of powder screening holes. At the head of the top - most rectangular screening plate, there is a feeding protection plate integrally formed with it and extending outwards. At the tail of each rectangular screening plate, there is a discharge protection plate integrally formed with it and extending outwards at the extended end.

[0008] Preferably, during operation, a vibration motor with an eccentric wheel is fixedly installed on the upper surface of the rectangular hollow housing.

[0009] Preferably, the structural radii of the powder screening holes in the rectangular screening plates at different heights decrease from top to bottom.

[0010] Preferably, the discharge protection plates in the rectangular screening plates at different heights extend outward in decreasing lengths from top to bottom.

[0011] Preferably, the cross-sectional structural shapes of the feeding protection plate and the discharge protection plate are both concave structures.

[0012] Preferably, the elastic support mechanism includes a bottom support base, two symmetric first spiral springs are fixedly installed at the upper end of the bottom support base, a top support substrate is fixedly installed at the top of the first spiral springs, and two symmetric component installation bases are fixedly installed at the upper end of the top support substrate.

[0013] Preferably, it further includes two angle-controllable connection mechanisms, which internally include a cylindrical hollow outer shell fixedly installed in the component installation base and in a hollow state inside, a central rotating shaft installed inside the cylindrical hollow outer shell through a bearing and fixedly connected to the first connecting plate at one end, a rotating column fixedly installed around the central rotating shaft and having a plurality of limiting slots arranged on its outer circumferential surface, and a limiting insertion rod placed in the cylindrical hollow outer shell and capable of inserting into the limiting slots to lock the rotating column.

[0014] Preferably, the angle-controllable connection mechanism includes a cylindrical hollow outer shell fixedly installed on the top of the component installation base, a cylindrical hollow cavity is arranged inside the cylindrical hollow outer shell, a shaft body installation hole is arranged at the axis of the cylindrical hollow outer shell, a rotatable central rotating shaft is installed inside the cylindrical hollow outer shell through a bearing at the positions of the shaft body installation hole and the cylindrical hollow cavity, a second connecting plate integrally formed with the central rotating shaft and fixedly connected to the first connecting plate is arranged at one end of the central rotating shaft, a rotating column is fixedly installed around the outer periphery of the shaft body of the central rotating shaft inside the cylindrical hollow cavity, a plurality of circumferentially and annularly arranged limiting slots are arranged on the outer circumferential surface of the rotating column, a longitudinal component moving cavity is arranged inside the top area of the cylindrical hollow outer shell, an internal moving plate capable of moving axially along the component moving cavity is placed inside the component moving cavity, a first rod body through hole communicating the bottom end of the component moving cavity and the cylindrical hollow cavity is arranged inside the cylindrical hollow outer shell, a second rod body through hole communicating with the external space is arranged at the top end of the component moving cavity, a limiting insertion rod fixedly installed at the bottom end of the internal moving plate and passing through the first rod body through hole and capable of inserting into the corresponding limiting slot is arranged, a pull rod passing through the second rod body through hole is fixedly installed on the upper surface of the internal moving plate, a pull plate is fixedly installed at the top end of the pull rod, and a second spiral spring is sleeved around the rod body of the pull rod inside the component moving cavity.

[0015] Preferably, the top end of the second spiral spring abuts against the top end face of the component moving cavity, the bottom end abuts against the upper surface of the internal moving plate, and the initial length of the second spiral spring is greater than the depth of the component moving cavity.

[0016] Compared with the prior art, the present invention provides a powder separator for the production of calcium carbonate powder, which has the following beneficial effects:

[0017] Cooperating with a vibration motor with an eccentric wheel, the calcium carbonate powder slides down in an oblique plane movement mode. During the sliding process, the vibrating filter plate can layer-separate the calcium carbonate powder during the jittering fall, enabling the calcium carbonate powder to have a larger screening area, thereby improving the effective screening effect on the calcium carbonate powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of the present invention;

[0019] Figure 2 is a perspective sectional view of the present invention;

[0020] Figure 3 is a perspective view of the layered screening mechanism in the present invention;

[0021] Figure 4 is a perspective sectional view of the layered screening mechanism in the present invention;

[0022] Figure 5 is a perspective view of the angle-controllable connecting mechanism in the present invention;

[0023] Figure 6 is a perspective sectional view of the angle-controllable connecting mechanism in the first perspective of the present invention;

[0024] Figure 7 is a perspective sectional view of the angle-controllable connecting mechanism in the second perspective of the present invention.

[0025] Wherein: 1. Layered screening mechanism; 11. Rectangular hollow housing; 12. Rectangular hollow cavity; 13. First connecting plate; 14. Rectangular screening plate; 15. Powder screening holes; 16. Feeding protection plate; 17. Discharging protection plate; 2. Elastic support mechanism; 21. Bottom support base; 22. Top support substrate; 23. First spiral spring; 24. Component installation base; 3. Angle-controllable connecting mechanism; 31. Cylindrical hollow housing; 32. Cylindrical hollow cavity; 33. Shaft body installation hole; 34. Central rotating shaft; 35. Second connecting plate; 36. Rotating column; 37. Limit slot; 38. Component moving cavity; 39. First rod body perforation; 310. Second rod body perforation; 311. Internal moving plate; 312. Limit inserting rod; 313. Second spiral spring; 314. Pulling plate; 315. Pulling rod. DETAILED DESCRIPTION OF THE INVENTION

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figure 1 and Figure 2 , a powder separator for the production of calcium carbonate powder, which needs to be used in cooperation with a vibration motor with an eccentric wheel, and the vibration motor with an eccentric wheel is fixedly installed on the upper surface of the rectangular hollow housing 11 to generate a vibration effect by the vibration motor.

[0028] In order to realize the screening function of calcium carbonate powder of different sizes, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , it is necessary to set up a layered screening mechanism 1, which is internally provided with a rectangular hollow housing 11 capable of installing a vibration motor with an eccentric wheel at the top, a plurality of rectangular screening plates 14 equally spaced inside the rectangular hollow housing 11 and capable of screening calcium carbonate powder, and a feeding protection plate 16 arranged at the head of the topmost rectangular screening plate 14 and used for feeding calcium carbonate powder. The calcium carbonate powder is put into the feeding protection plate 16. Since the layered screening mechanism 1 is in an inclined state and the vibration motor is started, the rectangular hollow housing 11 and each rectangular screening plate 14 will generate a vibration phenomenon. Under the action of gravity and vibration, the calcium carbonate powder will move towards the areas where the discharge protection plates 17 are located. At the same time, the powder with the largest size will move on the surface of the topmost rectangular screening plate 14, and the powder with a smaller size will fall downward through the powder screening holes 15. Similarly, calcium carbonate powder of different sizes can be screened. Since the lengths of the discharge protection plates 17 are different, the screened calcium carbonate powder will be accumulated at different collection positions according to different sizes, and can be classified and collected.

[0029] Regarding the specific structure of the layered screening mechanism 1, please refer to Figure 3 and Figure 4, including a rectangular hollow housing 11, with a rectangular hollow cavity 12 having open ends inside the rectangular hollow housing 11. On both sides of the rectangular hollow housing 11, there are first connecting plates 13 of an integral structure therewith. Inside the rectangular hollow housing 11 and within the rectangular hollow cavity 12, multiple rectangular screening plates 14 are installed successively from top to bottom. Inside each rectangular screening plate 14, there are multiple powder screening holes 15. At the head of the topmost rectangular screening plate 14, there is a feeding protection plate 16 of an integral structure therewith and extending outward. At the tail of each rectangular screening plate 14, there is a discharge protection plate 17 of an integral structure therewith and extending outward at the end. During operation, a vibration motor with an eccentric wheel is fixedly installed on the upper surface of the rectangular hollow housing 11. The powder screening holes 15 in the rectangular screening plates 14 at different heights decrease in structural radius from top to bottom. The discharge protection plates 17 in the rectangular screening plates 14 at different heights decrease in the length of the outward extension from top to bottom. The cross-sectional structural shapes of the feeding protection plate 16 and the discharge protection plate 17 are both concave structures.

[0030] To achieve the elastic support effect, please refer to Figure 1 , Figure 2 and Figure 5 , it is necessary to set up an elastic support mechanism 2, which internally has a bottom support base 21 that can be placed on the ground, a top support substrate 22 directly above the bottom support base 21 and capable of indirectly providing a height support effect for the rectangular hollow housing 11, and a first helical spring 23 installed between the bottom support base 21 and the top support substrate 22 and functioning as an elastic support. When the rectangular hollow housing 11 vibrates, the vibration effect will be transmitted to the first helical spring 23, and the first helical spring 23 will undergo an adaptive bending effect and perform a necessary support function, thereby achieving the elastic support effect.

[0031] Regarding the specific structure of the elastic support mechanism 2, please refer to Figure 5 , including the bottom support base 21. At the upper end of the bottom support base 21, two symmetric first helical springs 23 are fixedly installed. At the top of the first helical spring 23, a top support substrate 22 is fixedly installed. At the upper end of the top support substrate 22, two symmetric component mounting bases 24 are fixedly installed.

[0032] To achieve the inclination adjustment function of the rectangular hollow housing 11, please refer to Figure 1 , Figure 2 , Figure 6 and Figure 7, it is necessary to set two angle - controllable connecting mechanisms 3. Inside it, there is a cylindrical hollow shell 31 fixedly installed in the component installation base 24 and hollow inside, a central rotating shaft 34 installed inside the cylindrical hollow shell 31 through bearings and fixedly connected to the first connecting plate 13 at one end, a rotating column 36 fixedly installed around the central rotating shaft 34 and having a plurality of limiting slots 37 on its outer circumferential surface, and a limiting insertion rod 312 placed in the cylindrical hollow shell 31 and capable of inserting into the limiting slots 37 to lock the rotating column 36. According to the required angle, pull up the pull - plate 314 to make the limiting insertion rod 312 withdraw from the limiting slot 37, and then manually rotate the rectangular hollow shell 11 so that one side of the feeding protection plate 16 is obliquely upward and one side of the discharging protection plate 17 is obliquely downward, and make the rectangular hollow shell 11 controlled at a reasonable inclination angle. Then cancel the force applied to the pull - plate 314. Under the elastic action of the second helical spring 313, the limiting insertion rod 312 will be inserted into the corresponding limiting slot 37 to achieve the locked state, thus realizing the inclination adjustment function of the rectangular hollow shell 11.

[0033] For the specific structure of the angle - controllable connecting mechanism 3, please refer to Figure 6 and Figure 7, including a cylindrical hollow housing 31 fixedly installed on the top of the component mounting base 24. A cylindrical hollow cavity 32 is provided inside the cylindrical hollow housing 31. A shaft body mounting hole 33 is provided at the axis of the cylindrical hollow housing 31. A rotatable central rotating shaft 34 is installed inside the cylindrical hollow housing 31 at the shaft body mounting hole 33 and the cylindrical hollow cavity 32 through a bearing. One end of the central rotating shaft 34 is provided with a second connecting plate 35 which is integrally structured with it and fixedly connected to the first connecting plate 13. A rotating column 36 is fixedly installed on the outer periphery of the shaft of the central rotating shaft 34 inside the cylindrical hollow cavity 32. A plurality of circumferentially arranged limiting slots 37 are provided on the outer circumferential surface of the rotating column 36. A longitudinal component moving cavity 38 is provided inside the top area of the cylindrical hollow housing 31. An internal moving plate 311 capable of moving axially along the component moving cavity 38 is placed inside the component moving cavity 38. A first rod body perforation 39 communicating the bottom end of the component moving cavity 38 and the cylindrical hollow cavity 32 is provided inside the cylindrical hollow housing 31. A second rod body perforation 310 communicating with the external space is provided at the top end of the component moving cavity 38. A limiting insertion rod 312 which penetrates the first rod body perforation 39 and can be inserted into the corresponding limiting slot 37 is fixedly installed at the bottom end of the internal moving plate 311. A pull rod 315 penetrating the second rod body perforation 310 is fixedly installed on the upper surface of the internal moving plate 311. A pull plate 314 is fixedly installed at the top end of the pull rod 315. A second helical spring 313 is sleeved on the outer periphery of the rod of the pull rod 315 inside the component moving cavity 38. The top end of the second helical spring 313 abuts against the top end face of the component moving cavity 38, the bottom end abuts against the upper surface of the internal moving plate 311, and the initial length of the second helical spring 313 is greater than the depth of the component moving cavity 38.

[0034] In use, the vibration motor with an eccentric wheel is fixedly installed on the upper surface of the rectangular hollow housing 11. According to the required angle, pull up the pull plate 314 to make the limit insertion rod 312 withdraw from the limit slot 37, and then manually rotate the rectangular hollow housing 11 so that one side of the feeding protection plate 16 is obliquely upward and one side of the discharging protection plate 17 is obliquely downward, and make the rectangular hollow housing 11 controlled at a reasonable inclination angle. Then, cancel the force applied to the pull plate 314. Under the elastic action of the second helical spring 313, the limit insertion rod 312 will be inserted into the corresponding limit slot 37 to achieve the locked state. Turn on the vibration motor, and the rectangular hollow housing 11 and each rectangular screening plate 14 will generate a vibration phenomenon. Under the action of gravity and vibration, the calcium carbonate powder will move towards the areas where each discharging protection plate 17 is located. At the same time, the powder with the largest size will move on the surface of the highest rectangular screening plate 14, and the powder with a smaller size will fall downward through the powder screening holes 15. Similarly, the calcium carbonate powder of different sizes can be screened. Since the lengths of the discharging protection plates 17 are different, the screened calcium carbonate powder will be stacked at different collection positions according to different sizes, and can be classified and collected accordingly.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A powder classifier for producing calcium carbonate powder, characterized in that: include, A layered screening mechanism (1) is provided with a rectangular hollow housing (11) on the top of which a vibration motor with an eccentric wheel can be installed, a plurality of rectangular screening plates (14) installed at equal intervals inside the rectangular hollow housing (11) and capable of screening calcium carbonate powder, and a feeding protection plate (16) provided at the head of the topmost rectangular screening plate (14) and used for feeding calcium carbonate powder; And an elastic support mechanism (2), which is provided with a bottom support base (21) that can be placed on the ground, a top support base (22) located directly above the bottom support base (21) and capable of indirectly providing a high support effect to the rectangular hollow shell (11), and a No. 1 coil spring (23) installed between the bottom support base (21) and the top support base (22) and providing an elastic support function.

2. A powder classifier for producing calcium carbonate powder according to claim 1, characterized in that: The layered screening mechanism (1) comprises a rectangular hollow shell (11), the interior of the rectangular hollow shell (11) is provided with a rectangular hollow cavity (12) with both ends being in an open state, and two sides of the rectangular hollow shell (11) are provided with a No. 1 connecting plate (13) which is integrally formed with the shell, and the rectangular hollow shell (11) is provided with a plurality of rectangular screening plates (14) sequentially installed from top to bottom inside the rectangular hollow cavity (12), and each of the rectangular screening plates (14) is provided with a plurality of powder screening holes (15) inside, and the front part of the rectangular screening plate (14) located at the highest layer is provided with a feeding protection plate (16) which is integrally formed with the shell and extends outward, and the rear part of each of the rectangular screening plates (14) is provided with a discharge protection plate (17) which is integrally formed with the shell and extends outward.

3. A powder classifier for producing calcium carbonate powder according to claim 2, characterized in that: When working, a vibration motor with an eccentric wheel is fixedly mounted on the upper surface of the rectangular hollow housing (11).

4. A powder classifier for producing calcium carbonate powder according to claim 3, characterized in that: The powder screening holes (15) located in the rectangular screening plates (14) of different heights have a structure radius that decreases from top to bottom.

5. A powder classifier for producing calcium carbonate powder according to claim 4, characterized in that: The discharge protection plates (17) located in the rectangular screening plates (14) of different heights have a decreasing outward extension length from top to bottom.

6. A powder classifier for producing calcium carbonate powder according to claim 5, characterized in that: The structural shapes of the cross sections of the feeding protection plate (16) and the discharging protection plate (17) are both concave structures.

7. A powder classifier for producing calcium carbonate powder according to claim 6, characterized in that: The elastic support mechanism (2) comprises a bottom support base (21), the upper end of the bottom support base (21) is fixedly mounted with two symmetrical No. 1 coil springs (23), the top of the No. 1 coil spring (23) is fixedly mounted with a top support substrate (22), and the upper end of the top support substrate (22) is fixedly mounted with two symmetrical component mounting bases (24).

8. A powder classifier for producing calcium carbonate powder according to claim 7, characterized in that: The invention also comprises two angle-controllable connection mechanisms (3), wherein a cylindrical hollow shell (31) is provided inside the cylindrical hollow shell (31) which is fixedly installed in the component installation base (24) and is hollow inside, a central rotating shaft (34) which is installed inside the cylindrical hollow shell (31) through a bearing and one end of which is fixedly connected to the first connecting plate (13), a rotating column (36) which is fixedly installed on the periphery of the central rotating shaft (34) and has a plurality of limiting slots (37) on its outer circumferential surface, and a limiting plug rod (312) which is placed in the cylindrical hollow shell (31) and can be inserted into the limiting slots (37) so as to produce a locking effect on the rotating column (36).

9. A powder classifier for producing calcium carbonate powder according to claim 8, characterized in that: The angle-controllable connection mechanism (3) comprises a cylindrical hollow shell (31) fixedly mounted on the top of the component mounting base (24); a cylindrical hollow cavity (32) is arranged inside the cylindrical hollow shell (31); an axle body mounting hole (33) is arranged at the axis center of the cylindrical hollow shell (31); a rotatable central shaft (34) is installed in the cylindrical hollow shell (31) through a bearing inside the axle body mounting hole (33) and the cylindrical hollow cavity (32); a second connecting plate (35) which is integrally formed with the central shaft (34) and fixedly connected to the first connecting plate (13) is arranged at one end; a rotating column (36) is fixedly mounted on the outer periphery of the shaft body of the central shaft (34) located inside the cylindrical hollow cavity (32); a plurality of limiting slots (37) arranged in an annular array are arranged on the outer circumferential surface of the rotating column (36); a longitudinal component The movable cavity (38) is provided with an internal movable plate (311) capable of axially moving along the movable cavity (38) of the component, the interior of the cylindrical hollow shell (31) is provided with a first rod body through hole (39) connecting the bottom end of the movable cavity (38) of the component and the cylindrical hollow cavity (32), the top end of the movable cavity (38) of the component is provided with a second rod body through hole (310) connecting to the external space, and the bottom end of the internal movable plate (311) is fixed A limiting rod (312) is fixedly installed passing through the No. 1 rod body through hole (39) and can be inserted into the corresponding limiting slot (37); a pull rod (315) passing through the No. 2 rod body through hole (310) is fixedly installed on the upper surface of the internal movable plate (311); a pull plate (314) is fixedly installed on the top of the pull rod (315); and a No. 2 coil spring (313) is placed on the outer periphery of the rod body inside the component movable cavity (38).

10. A powder classifier for producing calcium carbonate powder according to claim 9, characterized in that: The top end of the No. 2 coil spring (313) abuts against the top end surface of the component movable cavity (38), and the bottom end abuts against the upper surface of the internal movable plate (311), and the initial length of the No. 2 coil spring (313) is greater than the depth of the component movable cavity (38).

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