Grinding machine for processing modified ground calcium carbonate special for coating

Abstract

The invention relates to the technical field of grinding equipment, and discloses a special modified ground calcium carbonate processing grinding miller for coatings, which comprises a barrel, a positioning rotating shaft is movably arranged in the barrel, a plurality of dispersion discs arranged at equal intervals are fixedly mounted on the positioning rotating shaft, and two grading wheels are further arranged in the barrel. Filter screen assemblies are arranged in inner cavities of the two grading wheels correspondingly, one side of each filter screen assembly communicates with a back flushing pipe, each filter screen assembly comprises a filter screen cylinder arranged in the corresponding grading wheel, and the two ends of the positioning rotating shaft are in transmission connection with positioning rotating pipes through hollow transmission devices correspondingly. The filter screen cylinders are arranged on the two sides of the inner cavity of the cylinder body respectively, the movable moving pipe is movably arranged in the positioning rotating pipe in a matched mode, the filter screen cylinder at one end of the cylinder body is used for filtering ground qualified coarse whiting superfine powder and discharging and collecting the coarse whiting superfine powder, and meanwhile the filter screen cylinder at the other end of the cylinder body is used for blowback airflow for unblocking. And the heavy calcium powder particles which are blocked on the filter screen cylinder and are not fully ground are cleaned through back flushing without shutdown, so that the grinding efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of grinding equipment, and in particular to a modified heavy calcium carbonate processing grinder specially used for coatings. Background Art

[0002] The surface of heavy calcium carbonate is activated by physical or chemical methods to improve its compatibility, dispersibility and functionality with the paint base material, thereby improving the overall performance of the paint. Grinding is an indispensable step in the processing of modified heavy calcium carbonate for paint. The grinding processes of modified heavy calcium carbonate for paint include dry ultrafine grinding and wet ultrafine grinding. Among them, wet ultrafine grinding using a bead mill (also called a sand mill) can achieve submicron high-end powder, which can improve the surface modification effect and application performance of the paint. In the field of high-end coatings (such as high-gloss powder coatings and heavy metal-free toy paints), wet products are more irreplaceable in terms of fineness, gloss and environmental protection.

[0003] When the existing bead mill grinds heavy calcium carbonate (i.e. heavy calcium coarse powder), the high-speed rotation of the dispersion disk in the cylinder causes the grinding medium to move violently. The heavy calcium coarse powder is subjected to high-frequency collision, friction and shear force in the gap between the media and is crushed to the micron level. The ground heavy calcium ultrafine powder is filtered and discharged through the filter cylinder.

[0004] However, during the grinding process of the existing bead mill, the incompletely ground heavy calcium particles are prone to clogging the filter drum, and the machine needs to be stopped to back-blow the air flow to clean the incompletely ground heavy calcium particles that are blocking the surface of the filter drum, which leads to reduced grinding efficiency. Moreover, the incompletely ground heavy calcium particles that are back-blown out are prone to re-attach to the surface of the filter drum when the machine is restarted for grinding, and will soon cause blockage again. Summary of the Invention

[0005] This application proposes a modified heavy calcium carbonate processing grinder specially designed for coatings, which has the advantage of high grinding efficiency and is used to solve the problem that the existing bead mill needs to be frequently shut down to backflush the insufficiently ground heavy calcium carbonate particles that clog the surface of the filter cylinder when grinding heavy calcium coarse powder, thereby affecting the grinding efficiency.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a modified heavy calcium carbonate processing grinder specially designed for coatings, comprising a cylinder, the internal movable setting of the cylinder is composed of a positioning shaft, and a number of equidistantly arranged dispersion disks are fixedly mounted on the positioning shaft. Two grading wheels are also provided in the cylinder, and the two grading wheels are respectively fixedly mounted at the two ends of the positioning shaft. The inner cavities of the two grading wheels are respectively provided with filter assemblies, and the filter assemblies are fixedly arranged inside the cylinder, and one side of the filter assembly is connected to a backblowing pipe. The filter assembly includes a filter cylinder arranged inside the grading wheel, and the two ends of the positioning shaft are respectively connected to a positioning rotating pipe through a hollow transmission device. One end of the positioning rotating pipe extends out of the outside of the cylinder, and one of the positioning rotating pipes is driven to rotate by a motor arranged on one side of the cylinder. The top of the cylinder is provided with feed ports located on both sides of the dispersion disk.

[0007] When grinding the heavy calcium coarse powder, the filter cylinder at one end of the cylinder is used to filter and discharge the qualified ultrafine powder after grinding, and the filter cylinder at the other end of the cylinder is passed through with back-blowing air to back-blow the inadequately ground heavy calcium powder particles that are blocked on the surface of the filter cylinder.

[0008] Furthermore, the cylinder is composed of an inner cylinder and an outer cylinder, and a water cooling chamber is formed between the inner cylinder and the outer cylinder. One end of the top of the cylinder is provided with a water inlet connected to the water cooling chamber, and the other end of the bottom of the cylinder is provided with a water outlet connected to the water cooling chamber. Cooling water is continuously introduced into the water cooling chamber through the water inlet. After the cylinder is cooled, the cooling water is discharged through the water outlet, thereby avoiding the problem that the internal temperature of the cylinder is too high and affects the grinding effect of calcium carbonate.

[0009] Furthermore, side covers are fixedly installed at both ends of the cylinder, and the positioning rotating tube is movably mounted on the side covers through bearings, and a sealing ring is provided at the connection between the positioning rotating tube and the side cover to avoid leakage. The two positioning rotating tubes are respectively arranged on the side covers, so that the two positioning rotating tubes, the hollow transmission device, the positioning rotating shaft and the hollow transmission device can rotate together under the drive of the motor. A slag discharge pipe connected to the inner cavity of the cylinder is also fixedly installed on the outer side of one of the side covers, and a valve is provided on the slag discharge pipe. During the grinding stage, the valve is closed. After the grinding is completed, the valve is opened and the slag is discharged through the slag discharge pipe.

[0010] The cam is secured to the chassis and has a U-shaped connecting tube, which is a vertical cam that is secured to the chassis by a spring that is secured to the chassis by a spring.

[0011] Furthermore, support members are fixedly installed on the outer sides of the two side covers, and one end of the two support members is movably connected to the connecting pipe. The connecting pipe is supported by the two support members so that the connecting pipe can move stably horizontally.

[0012] Furthermore, the cylinder is fixedly mounted on one of the cylinders, and a sleeve plate located on one side of the tee is also fixedly mounted on one of the U-shaped connecting pipes. The piston shaft of the cylinder is rotatably connected to one end of the sleeve plate, and the cylinder drives the piston shaft to drive the sleeve plate to move, thereby driving the two U-shaped connecting pipes and the two movable pipes to move together.

[0013] Furthermore, a passive pulley located outside the cylinder is fixedly mounted on one of the positioning rotating tubes, and a driving pulley is fixedly mounted on the output shaft of the motor. The passive pulley and the driving pulley are connected by a belt drive, and the output shaft is driven by the motor to drive the driving pulley to rotate, thereby driving the passive pulley, the positioning rotating tube, the hollow transmission device, the positioning rotating shaft and the dispersion disk to rotate together.

[0014] Furthermore, the hollow transmission device includes a rotating disk fixedly mounted on one end of the positioning shaft and an L-shaped coupling fixedly mounted on one end of the positioning rotating tube. A plurality of rotating blocks distributed in a circumferential array are fixedly mounted on the outer edge of one side of the rotating disk. The end of the rotating block away from the rotating disk is fixedly connected to the outer side of the L-shaped coupling. The rotating disk and the L-shaped coupling located in the filter cylinder are connected by a plurality of rotating blocks, so that the positioning shaft can rotate together with the positioning rotating tube, and the ground ultrafine powder entering the filter cylinder can enter and be discharged from one end of the moving tube in the positioning rotating tube.

[0015] Furthermore, a rubber disc is movably mounted on the middle part of one side of the rotating disc through a plane bearing, and the connection between the rotating disc and the rubber disc is sealed by a sealing ring, and is separated from the rubber disc by movement of a movable tube, so that the ground raw material can flow out through the movable tube, and the movable tube moves and contacts the rubber disc, so that the raw material cannot flow out of the movable tube, so as to ensure that during the back-blowing stage, the back-blowing airflow can be blown out from the inside of the filter cylinder to the outside, thereby cleaning up the insufficiently ground heavy calcium powder particles that clog the surface of the filter cylinder.

[0016] Furthermore, the filter assembly also includes two limiting plates, one of which is fixedly mounted on the inner side of the side cover, and the other limiting plate is movably mounted on one end of the positioning shaft through a bearing, and the other limiting plate is located on the side of the rotating disk away from the rubber disk, and a sealing ring is provided between the other limiting plate and the positioning shaft to seal the bearing, and a plurality of cross bars distributed in a circumferential array are fixedly mounted between the two limiting plates, and the cross bars are located at the outer edge of the limiting plates, and the filter cylinder is fixedly mounted on the outside of the cross bars, and the filter cylinder is supported and limited by the two limiting plates and the plurality of cross bars, so that qualified ultrafine powder after grinding the heavy calcium coarse powder can enter through the filter cylinder.

[0017] The beneficial effects of the present invention are as follows: 1. The modified heavy calcium carbonate processing grinder for coatings provided in the present application has a filter cylinder arranged on both sides of the inner cavity of the cylinder, and a movable moving tube is arranged in conjunction with the internal movement of the positioning rotating tube. The filter cylinder at one end of the cylinder is used to filter the qualified heavy calcium carbonate ultrafine powder after grinding and discharge it for collection. At the same time, the filter cylinder at the other end of the cylinder is used to back-blow the air flow for clearing blockage. Compared with the existing bead mill method of grinding heavy calcium carbonate coarse powder, there is no need to stop the machine for back-blow to clean the insufficiently ground heavy calcium carbonate powder particles blocking the filter cylinder, thereby improving the grinding efficiency.

[0018] 2. The modified heavy calcium carbonate processing grinder for coatings provided in the present application filters the qualified heavy calcium carbonate ultrafine powder after grinding through the filter cylinder at one end of the cylinder and discharges it for collection. At the same time, the filter cylinder at the other end of the cylinder is used to back-blow the air flow for clearing blockages, so that the heavy calcium carbonate powder particles that are not fully ground by backblowing flow to the filter cylinder used for filtration, so that the heavy calcium carbonate powder particles that are not fully ground by backblowing can re-enter the grinding medium at the dispersion disk for re-grinding. This avoids the problem that after the existing bead mill backblown the blockage on the surface of the filter cylinder, the heavy calcium carbonate powder particles that are not fully ground by backblowing are easily re-attached to the surface of the filter cylinder, causing blockage again, thereby reducing the frequency of backblowing and clearing blockages, and further improving the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. Those skilled in the art can also derive other drawings based on the provided drawings without inventive work. Figure 1 It is a structural schematic diagram of the present invention; Figure 2 for Figure 1 Schematic diagram of the middle section structure of the middle cylinder; Figure 3 for Figure 1 A top view of Figure 4 for Figure 2 A schematic diagram of the structure of one of the filter components; Figure 5 for Figure 2 Schematic diagram of the connection structure between the middle U-shaped connecting pipe and the positioning discharge pipe.

[0020] In the figure: 1. Cylinder; 101. Water inlet; 102. Water outlet; 103. Feed inlet; 2. Side cover; 3. Positioning rotating pipe; 4. Positioning rotating shaft; 5. Hollow transmission device; 501. Rotating disk; 502. L-shaped coupling; 503. Rotating block; 6. Dispersion disk; 7. Passive pulley; 8. Motor; 9. Active pulley; 10. Moving pipe; 11. Rubber disc; 12. Filter assembly; 121. Limiting plate; 122. Cross bar; 123. Filter cylinder; 13. Classifying wheel; 14. U-shaped connecting pipe; 15. Connecting pipe; 16. Tee pipe; 17. Diversion pipe; 18. Positioning discharge pipe; 19. Sleeve plate; 20. Support; 21. Cylinder; 22. Backflush pipe; 23. Slag discharge pipe. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Examples, such as Figure 1-Figure 3, a modified heavy calcium carbonate processing grinder specially used for coatings includes a cylinder 1, which is composed of an inner cylinder and an outer cylinder. A water-cooling chamber is formed between the inner cylinder and the outer cylinder. One end of the top of the cylinder 1 is provided with a water inlet 101 connected to the water-cooling chamber, and the other end of the bottom of the cylinder 1 is provided with a water outlet 102 connected to the water-cooling chamber. Cooling water is continuously introduced into the water-cooling chamber through the water inlet 101. After the cylinder 1 is cooled, the cooling water is discharged through the water outlet 102 to avoid the problem that the internal temperature of the cylinder 1 is too high and affects the grinding effect of calcium carbonate.

[0023] The two ends of the cylinder 1 are respectively fixedly mounted with side covers 2, and the middle parts of the two side covers 2 are respectively provided with positioning rotating tubes 3 through bearings, and the connection parts of the positioning rotating tubes 3 and the side covers 2 are provided with sealing rings for sealing. A positioning rotating shaft 4 is movably provided inside the cylinder 1, and the two ends of the positioning rotating shaft 4 are respectively connected to the two positioning rotating tubes 3 through a hollow transmission device 5. A plurality of equidistantly arranged dispersion discs 6 are fixedly mounted on the positioning rotating shaft 4, and a passive pulley 7 is fixedly mounted on one of the positioning rotating tubes 3. A motor 8 is provided on one side of the cylinder 1, and a driving pulley 9 is fixedly mounted on the output rotating shaft of the motor 8. The passive pulley 7 and the active pulley 9 are connected by a belt drive (wherein the passive pulley 7 and the active pulley 9 can also be set as gears and connected by a chain drive). The active pulley 9 is driven by the motor 8 to drive the passive pulley 7 to rotate, thereby driving the positioning rotating tube 3, the hollow transmission device 5, the positioning rotating shaft 4 and the dispersion disc 6 to rotate. The high-speed rotation of the dispersion disc 6 drives the grinding medium in the cylinder 1 to produce strong shear, impact and friction, so that the heavy calcium coarse powder raw material particles are ground into ultrafine powder.

[0024] See also Figure 2 and Figure 4 The hollow transmission device 5 includes a rotating disk 501 fixedly mounted on one end of the positioning shaft 4 and an L-shaped coupling 502 fixedly mounted on one end of the positioning rotating tube 3. A plurality of rotating blocks 503 distributed in a circumferential array are fixedly mounted on the outer edge of one side of the rotating disk 501. The end of the rotating block 503 away from the rotating disk 501 is fixedly connected to the outer side of the L-shaped coupling 502. The internal movable sleeve of the positioning rotating tube 3 is provided with a moving tube 10. A rubber disk 11 is movably mounted on the middle part of one side of the rotating disk 501 through a plane bearing, and the connection between the rotating disk 501 and the rubber disk 11 is sealed by a sealing ring. The rotating disk 501 is separated from the rubber disk 11 by the moving tube 10. The ground raw material can flow out through the moving tube 10 and contact and fit with the rubber disk 11 through the moving tube 10, so that the raw material cannot flow out of the moving tube 10.

[0025] A filter assembly 12 located on the outside of the hollow transmission device 5 is fixedly installed on the inner side of the side cover 2. The filter assembly 12 includes two limiting plates 121, one of which is fixedly installed on the inner side of the side cover 2, and the other limiting plate 121 is movably installed at one end of the positioning shaft 4 through a bearing, and the other limiting plate 121 is located on the side of the rotating disk 501 away from the rubber disk 11, and a sealing ring is provided between the other limiting plate 121 and the positioning shaft 4 to seal the bearing. A number of cross bars 122 distributed in a circumferential array are fixedly installed between the two limiting plates 121, and the cross bars 122 are located at the outer edge of the limiting plates 121. A filter cylinder 123 located between the two limiting plates 121 is fixedly installed on the outside of the cross bars 122. The ground ultrafine particles are filtered through the filter cylinder 123 and flow out through the gap between the moving tube 10 and the rubber disk 11 through the moving tube 10.

[0026] The two ends of the positioning shaft 4 are respectively fixed with a grading wheel 13, which is located outside the filter assembly 12. The grading wheel 13 rotates with the positioning shaft 4, preventing the grinding medium from entering without affecting the filtration of the ground particles through the filter.

[0027] See also Figure 2-Figure 5, one end of the two moving pipes 10 is flange-connected with a U-shaped connecting pipe 14, and one end of the two U-shaped connecting pipes 14 is flange-connected through a connecting pipe 15. A tee 16 is provided in the middle of one of the U-shaped connecting pipes 14, and a guide pipe 17 is flange-connected to one side of the tee 16. The guide pipe 17 is movably sleeved with a positioning discharge pipe 18 at one end away from the tee 16. The positioning discharge pipe 18 is fixedly arranged on the frame (not shown) like the cylinder 1. One of the U-shaped connecting pipes 14 is also fixedly sleeved with a sleeve plate 19 located on one side of the connecting pipe 15. Support members 20 are respectively fixedly installed on the outer sides of the two side covers 2. One end of the two support members 20 is movably sleeved with the connecting pipe 15, and one of the support members 20 is fixedly mounted on the cylinder 21. The piston shaft of the cylinder 21 is rotatably connected to one end of the sleeve plate 19. The connecting pipe 15 is supported by the support member 20, and the piston shaft driven by the cylinder 21 drives the sleeve plate 19 to move The two U-shaped connecting tubes 14 and the two moving tubes 10 move together, and one of the moving tubes 10 is controlled to move to separate from the rubber disc 11 on one side of the moving tube 10, while the other moving tube 10 moves to contact with the rubber disc 11 on one side of the moving tube 10, and one of the filter cylinders 123 is used for filtering, so that the ground particles are discharged by the moving tube 10 separated from the rubber disc 11, and after one of the filter cylinders 123 is blocked, one of the moving tubes 10 is controlled to move to contact with the rubber disc 11 on one side of the moving tube 10, and the other moving tube 10 moves to separate from the rubber disc 11 on one side of the moving tube 10, and the other filter cylinder 123 is used for filtering, and the ground particles are discharged by the moving tube 10 separated from the rubber disc 11, and at the same time, the blocked filter cylinder 123 is backblown to clear the blockage, and the backblown particles flow to the other end of the cylinder 1 and can be ground again by the grinding medium.

[0028] A backflush pipe 22 is fixedly installed on one side of the limiting plate 121. The backflush pipe 22 is connected to the inner cavity of the filter cylinder 123, and one end of the backflush pipe 22 away from the limiting plate 121 extends out of the outside of the side cover 2. A sealing ring is provided at the connection between the backflush pipe 22 and the side cover 2 for sealing. The backflush airflow enters through the backflush pipe 22, and the inner side of the filter cylinder 123 is blown out to the outside, thereby backblowing out the insufficiently ground calcium carbonate particles that are blocking the outer surface of the filter cylinder 123.

[0029] There are two feed ports 103 on the top of the cylinder 1, and several dispersion plates 6 are located between the two feed ports 103. When the filter cylinder 123 on one of the filter assemblies 12 is in a blocked state and needs to be backblown to clear the blockage, heavy calcium coarse powder is added to the feed port 103 close to the filter cylinder 123 on that side.

[0030] A slag discharge pipe 23 communicating with the inner cavity of the cylinder 1 is fixedly mounted on the outer side of one of the side covers 2. A valve is provided on the slag discharge pipe 23. During the grinding stage, the valve is closed. After the grinding is completed, the valve is opened to discharge slag through the slag discharge pipe 23.

[0031] When in use, first drive the piston through the cylinder 21 to drive the sleeve 19 to move, thereby driving the U-shaped connecting pipe 14, the connecting pipe 15, and the moving pipe 10 to move, so that a moving pipe 10 at one end of the cylinder 1 is separated from the rubber disc 11, such as the moving pipe 10 at the right end of the cylinder 1 is separated from the rubber disc 11, and the other moving pipe 10 at the left end of the cylinder 1 is in contact with the rubber disc 11. At this time, the heavy calcium coarse powder is controlled to enter from the feed port 103 at the top left end of the cylinder 1, and at the same time, the motor 8 is started to drive the output shaft to drive the active pulley 9 to rotate, and the driven pulley 7 and the positioning rotating pipe 3 are driven by the belt transmission to rotate, thereby driving the two positioning rotating pipes 3, the hollow transmission device 5, and the positioning rotating pipe 3. The rotating shaft 4 and the dispersion disk 6 rotate together, and the high-speed rotation of the dispersion disk 6 drives the grinding media such as glass beads, ceramic beads, etc. to produce strong shearing, impact and friction, so that the heavy calcium coarse powder is refined, and the ground ultrafine powder flows to the right side of the cylinder 1, and after being filtered by the filter cylinder 123 in the filter assembly 12 at the right end of the cylinder 1, it enters the moving pipe 10 from the gap between the moving pipe 10 and the rubber disc 11, and flows through the moving pipe 10, U-shaped connecting pipe 14, T-tube 16, guide pipe 17 and positioning discharge pipe 18 in sequence. When the filter cylinder 123 at the right end of the cylinder 1 is blocked, the piston shaft is driven by the cylinder 21 to drive the sleeve plate 19 to move in the opposite direction, thereby driving the U-shaped The connecting pipe 14, the connecting pipe 15, and the moving pipe 10 move in opposite directions, so that the moving pipe 10 at the right end of the cylinder 1 contacts the rubber disc 11, and the moving pipe 10 at the left end of the cylinder 1 separates from the rubber disc 11. At the same time, the heavy calcium coarse powder is controlled to enter from the feed port 103 at the right end of the top of the cylinder 1, and the ground ultrafine powder flows to the left side of the cylinder 1. After being filtered by the filter cylinder 123 in the filter assembly 12 at the left end of the cylinder 1, it enters the moving pipe 10 from the gap between the moving pipe 10 and the rubber disc 11, and flows through the moving pipe 10, the U-shaped connecting pipe 14 at the left end of the cylinder 1, the connecting pipe 15, the U-shaped connecting pipe 14 at the right end of the cylinder 1, the three-way pipe 16, and the guide pipe 1 7 and the positioning discharge pipe 18 are discharged, and at the same time, back-blowing gas is introduced through the back-blowing pipe 22 at the right end of the cylinder 1, and the back-blowing gas enters through the back-blowing pipe 22 and blows out the outside from the inner side of the filter cylinder 123 at the right end of the cylinder 1, thereby back-blowing out the inadequately ground heavy calcium powder particles blocked on the surface of the filter cylinder 123 at the right end of the cylinder 1, and at the same time, the back-blown heavy calcium powder particles flow to the filter assembly 12 at the left end of the cylinder 1, and are re-ground into qualified ultrafine powder through the grinding medium in the cylinder 1, until the filter cylinder 123 in the filter assembly 12 at the left end of the cylinder 1 is blocked, and then replaced with the filter cylinder 123 at the right end of the cylinder 1 to filter and grind qualified ultrafine powder.

[0032] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A modified heavy calcium carbonate grinding machine for coatings, comprising a cylinder, wherein the internal movable arrangement of the cylinder is provided by a positioning shaft, on which a plurality of equally spaced dispersing discs are fixedly mounted, characterized in that: Two classifying wheels are further provided in the cylinder, and the two classifying wheels are respectively fixedly mounted at the two ends of the positioning rotating shaft. The inner cavities of the two classifying wheels are respectively provided with filter assemblies, and the filter assemblies are fixedly arranged inside the cylinder, and one side of the filter assembly is connected to a backflush pipe. The filter assembly includes a filter cylinder arranged inside the classifying wheel, and both ends of the positioning rotating shaft are respectively connected to a positioning rotating pipe through a hollow transmission device. One end of the positioning rotating pipe extends out of the outside of the cylinder, and one of the positioning rotating pipes is driven to rotate by a motor arranged on one side of the cylinder. The top of the cylinder is provided with feed ports located on both sides of the dispersion disk; When grinding the heavy calcium coarse powder, the filter cylinder at one end of the cylinder is used to filter and discharge the qualified ultrafine powder after grinding, and the filter cylinder at the other end of the cylinder is passed through with back-blowing air to back-blow the inadequately ground heavy calcium powder particles that are blocked on the surface of the filter cylinder.

2. The modified heavy calcium carbonate processing grinder for coatings according to claim 1, characterized in that: The cylinder is composed of an inner cylinder and an outer cylinder, a water cooling chamber is formed between the inner cylinder and the outer cylinder, a water inlet connected to the water cooling chamber is provided at one end of the top of the cylinder, and a water outlet connected to the water cooling chamber is provided at the other end of the bottom of the cylinder.

3. The modified heavy calcium carbonate processing grinder for coatings according to claim 1, characterized in that: Side covers are fixedly installed at both ends of the cylinder, and the positioning rotating tube is movably mounted on the side covers through bearings. A sealing ring is provided at the connection between the positioning rotating tube and the side cover. A slag discharge pipe connected to the inner cavity of the cylinder is also fixedly installed on the outside of one of the side covers.

4. The modified heavy calcium carbonate processing grinder for coatings according to claim 3, characterized in that: The inner side of the positioning rotating tube is movably sleeved with a moving tube, one end of the moving tube extends to the inside of the limiting plate, and the other end of the moving tube extends out of the cylinder and is flange-connected with a U-shaped connecting tube. One end of the two U-shaped connecting tubes is flange-connected by a connecting tube, and the U-shaped connecting tube is driven to move by a support-driven piston shaft. One of the U-shaped connecting tubes is provided with a tee, one side of the tee is connected to a guide tube, and the end of the guide tube away from the tee is movably sleeved with a positioning discharge pipe.

5. The modified heavy calcium carbonate processing grinder for coatings according to claim 4, characterized in that: Support members are fixedly installed on the outer sides of the two side covers respectively, and one end of the two support members is movably sleeved with the connecting pipe respectively.

6. The modified heavy calcium carbonate processing grinder for coatings according to claim 5, characterized in that: The cylinder is fixedly mounted on one of the cylinders, and a sleeve plate located on one side of the three-way pipe is also fixedly mounted on one of the U-shaped connecting pipes, and the piston shaft of the cylinder is rotatably connected to one end of the sleeve plate.

7. The modified heavy calcium carbonate processing grinder for coatings according to claim 1, characterized in that: A passive pulley located outside the cylinder is fixedly mounted on one of the positioning rotating tubes, a driving pulley is fixedly mounted on the output rotating shaft of the motor, and the passive pulley and the driving pulley are connected via a belt transmission.

8. The modified heavy calcium carbonate processing grinder for coatings according to claim 1, characterized in that: The hollow transmission device includes a rotating disk fixedly mounted on one end of the positioning rotating shaft and an L-shaped coupling fixedly mounted on one end of the positioning rotating tube. A plurality of rotating blocks distributed in a circumferential array are fixedly mounted on the outer edge of one side of the rotating disk. The end of the rotating block away from the rotating disk is fixedly connected to the outer side of the L-shaped coupling.

9. The modified heavy calcium carbonate processing grinder for coatings according to claim 1, characterized in that: A rubber disc is movably mounted on the middle part of one side of the rotating disc through a plane bearing, and the connection between the rotating disc and the rubber disc is sealed by a sealing ring to ensure that during the back-blowing stage, the back-blowing airflow can be blown out from the inside of the filter cylinder to the outside, thereby cleaning out the insufficiently ground heavy calcium powder particles that clog the surface of the filter cylinder.

10. The modified heavy calcium carbonate processing grinder for coatings according to claim 3, characterized in that: The filter assembly also includes two limiting plates, one of which is fixedly mounted on the inner side of the side cover, and the other limiting plate is movably mounted on one end of the positioning shaft through a bearing, and the other limiting plate is located on the side of the rotating disk away from the rubber disk, and a sealing ring is provided between the other limiting plate and the positioning shaft to seal the bearing, a number of cross bars distributed in a circumferential array are fixedly mounted between the two limiting plates, and the cross bars are located on the outer edge of the limiting plates, and the filter cylinder is fixedly mounted on the outside of the cross bars.

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