A grinding and grading device and method for heavy calcium carbonate

Abstract

This invention relates to the field of grinding technology, and more particularly to a grinding and grading device and method for heavy calcium carbonate. It includes a support frame, an air guide shell fixed to the upper side of the support frame, a guide plate fixed to the lower side of the air guide shell in contact with the support frame, a grinding chamber fixed to the upper side of the air guide shell, a first grinding ring fixed to the lower side of the grinding chamber in contact with the air guide shell, a rotating shell located within the air guide shell and the grinding chamber rotatably connected to the guide plate, a connecting frame fixed to the rotating shell, and grinding rollers arranged in a circular array detachably connected to the connecting frame. An auger is rotatably connected inside the rotating shell. This invention uses an auger to convey material, employing a semi-enclosed spiral channel, to actively and directionally move the material along the channel to the grinding area under the forced push of the auger, thus solving the problem of material sliding back to the bottom of the mill from both sides during the process of being scooped up by a shovel.

Description

Technical Field

[0001] This invention relates to the field of grinding technology, and in particular to a grinding and grading device and method for heavy calcium carbonate. Background Technology

[0002] Heavy calcium carbonate is a widely used non-metallic mineral filler that plays an irreplaceable role in industries such as plastics, rubber, coatings, papermaking, and building materials. As downstream industries continue to increase their requirements for powder particle size distribution, whiteness, and activation indicators, the processing technology of heavy calcium carbonate is also constantly being improved.

[0003] Currently, the dry production process of heavy calcium carbonate typically uses grinding equipment to obtain products of various particle sizes. The main equipment includes Raymond mills, ring roller mills, ball mills, high-pressure roller mills, stirred mills, and vibratory mills. Raymond mills have long been the core equipment in the field of heavy calcium carbonate processing due to their mature and stable technology, relatively simple structure, and low operation and maintenance threshold.

[0004] The working principle of Raymond mill is as follows: the transmission device drives the central shaft to rotate, and the grinding roller device suspended on the flower frame revolves around the vertical axis. At the same time, the grinding roller itself rotates due to friction. Due to the centrifugal force during rotation, the grinding roller swings outward and presses tightly against the grinding ring. The material is fed between the grinding roller and the grinding ring, and the grinding roller achieves the purpose of crushing by rolling and crushing. The shovel is installed at the turntable position of the main unit base and rotates with the turntable. Its core function is to shovel up the material and continuously throw it into the grinding area between the grinding roller and the grinding ring.

[0005] However, the inherent technical defects of the traditional Raymond mill shovel feeding method are becoming increasingly prominent, mainly in the following aspects: When the material is scooped up by the shovel and thrown into the grinding zone, some of the material will slide back to the bottom of the Raymond mill from both sides of the shovel. This part of the material cannot enter the grinding zone, resulting in the grinding roller not being able to crush enough material, causing a decrease in grinding efficiency and energy waste. As a result, the material is repeatedly scooped up and repeatedly slides down, and it never participates in effective crushing, forming an ineffective cycle. Summary of the Invention

[0006] To address the problems mentioned in the background section, this invention provides a grinding and grading apparatus and method for heavy calcium carbonate.

[0007] The technical implementation of the present invention is as follows: a grinding and grading device for heavy calcium carbonate, comprising a support frame, an air guide shell fixedly connected to the upper side of the support frame, a guide plate fixedly connected to the lower side of the air guide shell and in contact with the support frame, a grinding box fixedly connected to the upper side of the air guide shell, a first grinding ring fixedly connected to the lower side of the grinding box and in contact with the air guide shell, a feed shell fixedly connected to and communicating with the grinding box, a discharge section provided on the upper side of the grinding box, a rotating shell located in the air guide shell and the grinding box rotatably connected to the guide plate, a connecting frame fixedly connected to the rotating shell, a grinding roller distributed in a ring array detachably connected to the connecting frame, all of the grinding rollers in the ring array contacting the inner side of the first grinding ring, an auger rotatably connected inside the rotating shell, a first guide hole provided on the top of the rotating shell, a second guide hole distributed in a ring array provided on the lower side of the rotating shell, a discharge shell distributed in a ring array fixedly connected to and communicating with the upper side of the rotating shell, a driving assembly provided on the support frame, and a pre-grinding assembly provided inside the grinding box.

[0008] Furthermore, the auger is provided with a through hole, and a receiving plate is fixedly connected to the lower side of the rotating shell near the second guide hole.

[0009] Furthermore, the upper side of the guide plate is provided with a recess, which is used to facilitate the movement of material into the rotating shell.

[0010] Furthermore, the drive assembly includes a first motor, which is fixedly connected to the support frame and is connected to the auger. A protective shell is fixedly connected to the support frame, and a second motor is fixedly connected to the outside of the support frame. A transmission part for connecting the drive shaft of the second motor and the rotating shell is provided inside the protective shell.

[0011] Furthermore, the pre-grinding assembly includes a second grinding ring located above the first grinding ring, the second grinding ring being fixedly connected to the grinding box, and the grinding roller being fixedly connected to a squeeze roller, the squeeze roller being used for initial grinding of the material.

[0012] Furthermore, the rotating shell is fixedly connected to and communicates with several groups of guide shells arranged in a ring array. The number of the several groups of guide shells arranged in the ring array corresponds one-to-one with the number of grinding rollers. Each group of guide shells consists of two shells. One guide shell is located on the same horizontal plane as the corresponding extrusion roller, and the other guide shell is located on the same horizontal plane as the lower side of the corresponding grinding roller. The guide shell is fixedly connected to a guide shell. The diameter of the guide shell corresponding to the lower side of the grinding roller is smaller than the diameter of the guide shell corresponding to the extrusion roller.

[0013] Furthermore, the projection of the guide shell onto the horizontal plane is triangular.

[0014] Furthermore, a sliding ring is fixedly connected inside the rotating shell. The sliding ring is provided with a circular array of discharge ports. The number of discharge ports of the sliding ring corresponds one-to-one with the number of grinding rollers. The discharge port is connected to the guide shell located on the lower side. Several fixing rods are fixedly connected to the discharge port of the sliding ring.

[0015] Furthermore, the fixing rod is in a vertical position on the sliding ring.

[0016] A method for using a grinding and grading device for heavy calcium carbonate, based on a grinding and grading device for heavy calcium carbonate, the specific structure of which is as follows: S1: During the grinding process of the material, the second motor drives the rotating shell to rotate around the air guide shell in the grinding box through the transmission part. The rotating shell drives the parts on it to rotate through the connecting frame. The first motor drives the auger to rotate clockwise. S2: The material is fed into the grinding box through the feed shell and subjected to double extrusion by the extrusion roller and the second grinding ring. Large-diameter material is held between the two and shear stress is applied, causing the large-diameter material to break into multiple small pieces. The remaining material is extruded by the grinding roller and the first grinding ring. S3: During the material processing, the material falls onto the upper side of the guide plate and moves into the rotating housing under the guidance of the recess on the upper side of the guide plate; S4: As the rotating shell rotates, the auger lifts the material upwards; S5: Material that can pass through the gap between the two fixed rods enters the adjacent and lower guide shell through the fixed rods. The guide shell guides the small-diameter material to the adjacent guide shell and discharges it from the side of the guide shell away from the adjacent guide shell, thus completing the guidance of the small-diameter material. S6: As the auger rotates, the material inside the rotating shell enters the upper guide shell, which guides the large-diameter material to the adjacent guide shell, and discharges it from the side of the guide shell away from the adjacent guide shell, thus completing the guidance of the large-diameter material. S7: When the material inside the rotating shell is not discharged in time and is already full, the material is guided out from all the discharge shells and then ground by the extrusion roller and the second grinding ring, the grinding roller and the first grinding ring. S8: During the material processing, powder that meets the required particle size is discharged from the discharge section.

[0017] The beneficial effects of this invention are as follows: This invention uses a auger to convey materials and utilizes a semi-enclosed spiral channel to allow the material to actively and directionally move along the channel to the grinding area under the forced push of the auger. This solves the problem that in existing shovels, the material slides back to the bottom of the mill from both sides during the material lifting process. By actively transferring the material upward through the auger, the contact opportunities between the material and the grinding roller and the first grinding ring are increased, thereby increasing grinding efficiency while reducing energy waste. The grinding roller and the first grinding ring are combined with a pre-grinding component to process the material, thereby achieving graded grinding of the material. Inside the grinding chamber, the material is subjected to dual extrusion by the second grinding ring and the extrusion roller. Combined with the meshing action of the outer teeth of the extrusion roller and the inner teeth of the second grinding ring, shear force is applied to the large-diameter material, causing it to break. Compared with the simple extrusion method, the shearing action breaks the large-diameter material into multiple small-diameter materials in one go, thereby reducing the number of times the material is repeatedly crushed in subsequent stages. During the material transfer process, small-diameter materials pass through the gap between two adjacent fixed rods and enter the lower guide shell, where they are guided to the grinding roller and the first grinding ring. Large-diameter materials enter the upper guide shell as the auger rotates and are guided to the squeezing roller and the second grinding ring. This achieves the effect of automatic flow distribution according to particle size, with each particle entering its proper place. At the same time, both small and large-diameter materials are actively fed into the grinding area through the guide shell, avoiding the ineffective energy consumption caused by material slippage and repeated circulation in the traditional shovel throwing method. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural cross-sectional view of the present invention; Figure 3 This is a bottom view of the three-dimensional structure of the present invention; Figure 4 This is a three-dimensional structural cross-sectional view of the grinding box of the present invention; Figure 5 This is a three-dimensional sectional view of the guide plate of the present invention; Figure 6 This is a three-dimensional structural diagram of the rotating shell of the present invention; Figure 7 This is a three-dimensional structural diagram showing the positional relationship of the connecting frame of the present invention; Figure 8 This is a three-dimensional structural cross-sectional view of the rotating shell of the present invention; Figure 9 This is an exploded view of the three-dimensional structure of the sliding ring of the present invention.

[0019] In the diagram: 1. Support frame, 2. Air guide shell, 3. Guide plate, 4. Grinding box, 401. First grinding ring, 5. Feed shell, 6. Discharge section, 7. Rotating shell, 701. Receiving plate, 702. Discharge shell, 703. Guide shell, 704. Guide shell, 8. Connecting frame, 9. Grinding roller, 10. Screw conveyor, 11. First motor, 12. Protective shell, 13. Second motor, 14. Transmission section, 15. Second grinding ring, 16. Extrusion roller, 17. Sliding ring, 18. Fixing rod. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Before using this invention to grind materials, the following operations should be performed: connect the powder discharge port to the upper side of the discharge section 6, connect the external feeding pipe to the feed shell 5, and connect the external blower to the air guide shell 2.

[0022] This invention addresses the problem that during the process of material being scooped up by a shovel and thrown into the grinding zone, some material slides back to the bottom of the Raymond mill from both sides of the shovel, resulting in insufficient material being ground by the grinding rollers, leading to decreased grinding efficiency and energy waste. The invention replaces the existing shovel with a screw conveyor system, as detailed below: Example 1

[0023] A grinding and grading device for heavy calcium carbonate, such as Figures 1-9As shown, the device includes a support frame 1, an air guide shell 2 fixedly connected to the upper side of the support frame 1, a guide plate 3 fixedly connected to the lower side of the air guide shell 2 in contact with the support frame 1, a grinding box 4 fixedly connected to the upper side of the air guide shell 2, a first grinding ring 401 fixedly connected to the lower side of the grinding box 4 in contact with the air guide shell 2, a feed shell 5 fixedly connected and connected to the grinding box 4, a discharge section 6 provided on the upper side of the grinding box 4, a rotating shell 7 located in the air guide shell 2 and the grinding box 4 rotatably connected to the guide plate 3, a connecting frame 8 fixedly connected to the rotating shell 7, and a ring array of grinding rollers 9 detachably connected to the connecting frame 8. All the ring array of grinding rollers 9 are connected to the first grinding ring 401 in contact with the air guide shell 2. A grinding ring 401 is in contact with the inner side of the rotating shell 7. An auger 10 is rotatably connected inside the rotating shell 7. The auger 10 is provided with a through hole. A first guide hole is provided on the top of the rotating shell 7. A second guide hole is provided on the lower side of the rotating shell 7 in a ring array. A discharge shell 702 in a ring array is fixedly connected to and connected to the upper side of the rotating shell 7. A drive assembly is provided on the support frame 1. The drive assembly is used to drive the auger 10 and the rotating shell 7 to rotate. A receiving plate 701 is fixedly connected to the lower side of the rotating shell 7 near the second guide hole. A pre-grinding assembly is provided inside the grinding box 4. The pre-grinding assembly is used to pre-treat the material.

[0024] In the above scheme, the discharge section 6 consists of a powder guide shell and a classifier installed inside it. The classifier consists of a speed-regulating motor and an impeller. The impeller is usually equipped with several blades. When the fineness of the powder meets the working requirements, the powder passes through the gap between the impeller blades in the classifier and enters the next collection process with the airflow. Coarse powder (powder that does not meet the working requirements) is blocked when it collides with the impeller blades. Through the high-speed rotation of the impeller, the larger coarse particles are thrown to the surroundings. When the gravity of the powder is greater than the upward thrust of the airflow, it will fall and return to the grinding area for re-grinding. During the grinding process, the material entering between the grinding roller 9 and the first grinding ring 401 is subjected to continuous extrusion and shearing forces by the rotation of the grinding roller 9, thereby being crushed. At the same time, the rotation of the auger 10... The material on the upper side of the guide plate 3 is conveyed from bottom to top until it slides out from all the discharge shells 702. Compared with the traditional passive throwing method of the shovel, the present invention realizes the forced and continuous feeding of materials through the active vertical lifting of the auger 10. At the same time, the air sent into the air vent 2 by the external fan enters the rotating shell 7 through the second guide hole on the lower side of the rotating shell 7 and is discharged from the first guide hole on the upper side of the rotating shell 7. During this process, the air passes through the through hole of the auger 10, and the airflow channel formed by the above process quickly carries out the powder on the auger 10 and inside the rotating shell 7. While reducing the dust concentration inside the rotating shell 7, the rotating shell 7 is cleaned. The receiving plate 701 is arc-shaped and is used to gather the surrounding materials into the rotating shell 7 as the rotating shell 7 rotates with the receiving plate 701.

[0025] like Figures 3-6As shown, a recess is provided on the upper side of the guide plate 3 to facilitate the movement of materials into the rotating shell 7.

[0026] In the above scheme, the cross-section of the recess on the upper side of the guide plate 3 is in the shape of an inverted isosceles trapezoid.

[0027] like Figures 2-6 As shown, the drive assembly includes a first motor 11, which is fixed to the support frame 1 and is connected to the auger 10. The support frame 1 is fixed to a protective shell 12, and a second motor 13 is fixed to the outside of the support frame 1. The protective shell 12 is provided with a transmission part 14 for connecting the drive shaft of the second motor 13 and the rotating shell 7.

[0028] In the above scheme, the protective shell 12 is used to cover the transmission part 14. The lower side of the protective shell 12 contacts the top of the rotating shell 7. Lubrication parts can be placed between the two according to the actual situation. The transmission part 14 consists of two transmission shafts and a universal joint rotatably connected in the protective shell 12. One of the transmission shafts is fixedly connected to the drive shaft of the second motor 13, and the other transmission shaft is fixedly connected to the top of the rotating shell 7. The two transmission shafts are connected by a universal joint.

[0029] like Figure 5 As shown, the pre-grinding assembly includes a second grinding ring 15 located above the first grinding ring 401. The second grinding ring 15 is fixedly connected to the grinding box 4. The grinding roller 9 is fixedly connected to a squeeze roller 16, which is used to perform initial grinding on the material.

[0030] In the above scheme, there is a gap between the extrusion roller 16 and the second grinding ring 15. The second grinding ring 15 is a toothed ring, and the extrusion roller 16 is a gear-like structure. The tooth blocks on the extrusion roller 16 are detachable and replaceable. The material between the extrusion roller 16 and the second grinding ring 15 is extruded and crushed by the rotation of the extrusion roller 16 during its rotation, so as to achieve the pretreatment of the material. In conjunction with the grinding roller 9, the material is ground to achieve the grading treatment of the material. The second grinding ring 15 and the first grinding ring 401 are transitioned by an inclined ring surface, which is located inside the grinding box 4.

[0031] like Figures 6-9 As shown, the rotating shell 7 is fixedly connected to and connected to several groups of guide shells 703 arranged in a ring array. The number of groups of guide shells 703 arranged in a ring array corresponds one-to-one with the number of grinding rollers 9. There are two guide shells 703 in each group. One guide shell 703 is located on the same horizontal plane as the corresponding extrusion roller 16, and the other guide shell 703 is located on the same horizontal plane as the lower side of the corresponding grinding roller 9. The guide shell 703 is fixedly connected to a guide shell 704. The diameter of the guide shell 704 corresponding to the lower side of the grinding roller 9 is smaller than the diameter of the guide shell 704 corresponding to the extrusion roller 16. The projection of the guide shell 704 on the horizontal plane is triangular.

[0032] In the above scheme, in actual use, the guide shell 703 is inclined downward from the inside out, but its projection on the horizontal plane is arc-shaped, which is used to make the material conveying channel have an inclination so as to facilitate the discharge of the material, and to guide the material to the space between the extrusion roller 16 and the second grinding ring 15 or between the grinding roller 9 and the first grinding ring 401.

[0033] like Figure 7 and Figure 8 As shown, a sliding ring 17 is fixedly connected inside the rotating shell 7. The sliding ring 17 is provided with a circular array of discharge ports. The number of discharge ports of the sliding ring 17 corresponds one-to-one with the number of grinding rollers 9. The discharge port is connected to the guide shell 703 located on the lower side. Several fixing rods 18 are fixedly connected to the discharge port of the sliding ring 17. The fixing rods 18 are in a vertical state on the sliding ring 17.

[0034] In the above scheme, several fixed rods 18 are used to filter materials so that large-diameter materials do not pass through the sliding ring 17. During the rotation of the auger 10, the materials are conveyed from bottom to top. With the help of the vertical state of the fixed rods 18, the probability of materials getting stuck and thus affecting the auger 10 is reduced.

[0035] Working principle: When using this device to grind materials, an external blower sends air into the air guide shell 2. The air guide shell 2 guides the air into the grinding chamber 4. Part of the air flows upward in the grinding chamber 4, and the other part enters the rotating shell 7 through the second guide hole on the lower side of the rotating shell 7 and passes through the through hole on the auger 10. It is discharged through the first guide hole on the top of the rotating shell 7 and finally extracted by the discharge part 6. In this way, the air circulation in the grinding chamber 4 is maintained. At the same time, the second motor 13 drives the rotating shell 7 to rotate clockwise around the air guide shell 2 in the grinding chamber 4 through the transmission part 14 (clockwise when viewed from top to bottom). During the rotation of the rotating shell 7, the connecting frame 8 drives the parts on it to rotate at the same time. The first motor 11 drives the auger 10 to rotate clockwise (clockwise when viewed from top to bottom, the speed of the auger 10 is faster than the speed of the rotating shell 7). The above working process realizes the preheating before grinding.

[0036] Traditional Raymond mills have smooth cylindrical surfaces on both the inner wall of the grinding ring and the outer surface of the grinding rollers. Material is crushed entirely by a single "crushing" mechanism. However, heavy calcium carbonate typically has a wide particle size distribution. In the initial crushing of large-diameter materials using traditional smooth-surface grinding methods, these materials tend to "slip" in the crushing zone, requiring repeated crushing. This results in limited grinding efficiency and high energy consumption. This invention addresses this problem through the following methods: After preheating is completed, the external feeding pipe sends the material into the feed shell 5, and the feed shell 5 sends the material into the grinding box 4. The material entering the grinding box 4 is squeezed by the extrusion roller 16 and the second grinding ring 15. With the help of the outer teeth of the extrusion roller 16 and the inner teeth of the second grinding ring 15, the large-diameter material is actively bitten between the two and shear stress is applied, causing the large-diameter material to break. Compared with simple extrusion, the shearing action breaks the large-diameter material into multiple small pieces, thereby reducing the number of subsequent repeated crushing.

[0037] During the processing of large-diameter materials, the remaining materials are squeezed by the grinding roller 9 and the first grinding ring 401, thereby achieving the grinding of the materials. Combined with the above-mentioned shearing treatment of large-diameter materials, the materials are classified.

[0038] During the material processing, the material falls successively onto the upper side of the guide plate 3. Guided by the recesses on the upper side of the guide plate 3, the material moves closer to the rotating shell 7. As the rotating shell 7 rotates, the receiving plate 701 collects the material through the second guide hole on the lower side of the rotating shell 7 and into the rotating shell 7. With the rotation of the auger 10, the material is lifted upwards. As the auger 10 rotates, the height of the material inside the rotating shell 7 gradually increases. Simultaneously, material that can pass through the gap between the two fixed rods 18 passes through the two fixed rods 18 and enters the adjacent, lower guide shell 703. The guide shell 703 guides the small-diameter material to the adjacent guide shell 704, and then... 4. The material is discharged from the side away from the adjacent guide shell 703. The small-diameter material is guided to the grinding roller 9 and the first grinding ring 401 through the guide shell 704. The small-diameter material is actively guided to the grinding roller 9 and the first grinding ring 401 by feeding, realizing the directional feeding of small-diameter material, thereby reducing ineffective energy consumption. As the auger 10 rotates, the material in the rotating shell 7 enters the upper guide shell 703. The guide shell 703 guides the large-diameter material to the adjacent guide shell 704. The material is discharged from the side away from the adjacent guide shell 703 through the guide shell 704. The large-diameter material is guided to the extrusion roller 16 and the second grinding ring 15 through the guide shell 704, thereby realizing the directional feeding of large-diameter material.

[0039] When the material inside the rotating shell 7 is not discharged in time and the rotating shell 7 is full of material, the material is guided out from all the discharge shells 702 to achieve the effect of emergency material guiding. During the material processing, the powder that meets the work requirements is discharged upward from the discharge section 6, and the material that does not meet the work requirements continues to be processed by the grinding process. After the material processing is completed, the machine can be turned off and cleaned. Example 2

[0040] Based on Example 1, a method for using a grinding and grading device for heavy calcium carbonate is as follows: Figures 1-9As shown, the specific steps of a grinding and grading device based on heavy calcium carbonate are as follows: S1: During the grinding process of the material, the second motor 13 drives the rotating shell 7 to rotate around the air guide shell 2 in the grinding box 4 through the transmission part 14. The rotating shell 7 drives the parts on it to rotate through the connecting frame 8. The first motor 11 drives the auger 10 to rotate clockwise. S2: The material is fed into the grinding box 4 through the feed shell 5 and subjected to double extrusion by the extrusion roller 16 and the second grinding ring 15. The large-diameter material is held between the two and shear stress is applied, causing the large-diameter material to break into multiple small pieces. The remaining material is extruded by the grinding roller 9 and the first grinding ring 401. S3: During the material processing process, the material falls onto the upper side of the guide plate 3 and moves into the rotating shell 7 under the guidance of the upper recess of the guide plate 3. S4: As the rotating shell 7 rotates, the auger 10 rotates to lift the material upwards; S5: Material that can pass through the gap between the two fixed rods 18 passes through the fixed rods 18 and enters the adjacent and lower guide shell 703. The guide shell 703 guides the small-diameter material to the adjacent guide shell 704, and discharges it from the side of the guide shell 704 away from the adjacent guide shell 703, thus completing the guidance of the small-diameter material. S6: As the auger 10 rotates, the material inside the rotating shell 7 enters the upper guide shell 703, which guides the large-diameter material to the adjacent guide shell 704, and discharges it from the side of the guide shell 704 away from the adjacent guide shell 703, thus completing the guidance of the large-diameter material. S7: When the material inside the rotating shell 7 is not discharged in time and is already full, the material is guided out from all the discharge shells 702 and then ground by the extrusion roller 16 and the second grinding ring 15 with the grinding roller 9 and the first grinding ring 401. S8: During the material processing, powder that meets the required particle size is discharged from the discharge section 6.

[0041] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A grinding and grading device for heavy calcium carbonate, characterized in that, It includes a support frame (1), an air guide shell (2) fixedly connected to the upper side of the support frame (1), a guide plate (3) fixedly connected to the lower side of the air guide shell (2) in contact with the support frame (1), a grinding box (4) fixedly connected to the upper side of the air guide shell (2), a first grinding ring (401) fixedly connected to the lower side of the grinding box (4) in contact with the air guide shell (2), a feed shell (5) fixedly connected and connected to the grinding box (4), a discharge section (6) provided on the upper side of the grinding box (4), and a rotating shell (7) rotatably connected to the guide plate (3) and located inside the air guide shell (2) and the grinding box (4). 7) A connecting frame (8) is fixedly connected, and the connecting frame (8) is detachably connected to a grinding roller (9) arranged in a ring array. The grinding roller (9) arranged in a ring array is in contact with the inner side of the first grinding ring (401). An auger (10) is rotatably connected inside the rotating shell (7). A first guide hole is provided on the top of the rotating shell (7). A second guide hole arranged in a ring array is provided on the lower side of the rotating shell (7). A discharge shell (702) arranged in a ring array is fixedly connected and connected to the upper side of the rotating shell (7). A driving component is provided on the support frame (1). A pre-grinding component is provided inside the grinding box (4).

2. The grinding and grading equipment for heavy calcium carbonate according to claim 1, characterized in that, The auger (10) is provided with a through hole, and a receiving plate (701) is fixedly connected to the lower side of the rotating shell (7) near the second guide hole.

3. The grinding and grading equipment for heavy calcium carbonate according to claim 2, characterized in that, The upper side of the guide plate (3) is provided with a recess, which is used to facilitate the movement of material into the rotating shell (7).

4. The grinding and grading equipment for heavy calcium carbonate according to claim 3, characterized in that, The drive assembly includes a first motor (11), which is fixed to the support frame (1) and is connected to the auger (10) in a transmission manner. The support frame (1) is fixed to a protective shell (12), and a second motor (13) is fixed to the outside of the support frame (1). The protective shell (12) is provided with a transmission part (14) for connecting the drive shaft of the second motor (13) and the rotating shell (7).

5. The grinding and grading equipment for heavy calcium carbonate according to claim 4, characterized in that, The pre-grinding assembly includes a second grinding ring (15) located above the first grinding ring (401), the second grinding ring (15) being fixedly connected to the grinding box (4), and the grinding roller (9) being fixedly connected to a squeeze roller (16), the squeeze roller (16) being used for initial grinding of the material.

6. The grinding and grading equipment for heavy calcium carbonate according to claim 5, characterized in that, The rotating shell (7) is fixedly connected to and connected to several groups of guide shells (703) arranged in a ring array. The number of the several groups of guide shells (703) arranged in the ring array corresponds one-to-one with the number of the grinding rollers (9). There are two guide shells (703) in each group. One of the guide shells (703) is located on the same horizontal plane as the corresponding extrusion roller (16), and the other guide shell (703) is located on the same horizontal plane as the lower side of the corresponding grinding roller (9). The guide shell (703) is fixedly connected to a guide shell (704). The diameter of the guide shell (704) corresponding to the lower side of the grinding roller (9) is smaller than the diameter of the guide shell (704) corresponding to the extrusion roller (16).

7. The grinding and grading equipment for heavy calcium carbonate according to claim 6, characterized in that, The projection of the guide shell (704) onto the horizontal plane is triangular.

8. The grinding and grading equipment for heavy calcium carbonate according to claim 7, characterized in that, The rotating shell (7) is fixedly connected to a sliding ring (17). The sliding ring (17) is provided with a circular array of discharge ports. The number of discharge ports of the sliding ring (17) corresponds one-to-one with the number of grinding rollers (9). The discharge port is connected to the guide shell (703) located on the lower side. Several fixing rods (18) are fixedly connected to the discharge port of the sliding ring (17).

9. The grinding and grading equipment for heavy calcium carbonate according to claim 8, characterized in that, The fixing rod (18) is in a vertical position on the sliding ring (17).

10. A method of using a grinding and grading device for heavy calcium carbonate, wherein the grinding and grading device for heavy calcium carbonate according to claim 9 is characterized in that, The specific steps are as follows: S1: During the grinding process, the second motor (13) drives the rotating shell (7) to rotate around the air guide shell (2) inside the grinding box (4) via the transmission part (14). The rotating shell (7) drives the parts on it to rotate via the connecting frame (8). The first motor (11) drives the auger (10) to rotate clockwise. S2: The material is fed into the grinding box (4) through the feed shell (5) and subjected to double extrusion by the extrusion roller (16) and the second grinding ring (15). The large-diameter material is held between the two and shear stress is applied, causing the large-diameter material to break into multiple small pieces. The remaining material is extruded by the grinding roller (9) and the first grinding ring (401). S3: During the material processing, the material falls onto the upper side of the guide plate (3) and moves into the rotating shell (7) under the guidance of the recess on the upper side of the guide plate (3); S4: As the rotating shell (7) rotates, the auger (10) rotates to lift the material upward; S5: Material that can pass through the gap between the two fixed rods (18) enters the adjacent and lower guide shell (703) through the fixed rod (18), and the guide shell (703) guides the small-diameter material to the adjacent guide shell (704), and discharges it from the side of the guide shell (704) away from the adjacent guide shell (703) to complete the guidance of the small-diameter material; S6: As the auger (10) rotates, the material inside the rotating shell (7) enters the upper guide shell (703), and the guide shell (703) guides the large-diameter material to the adjacent guide shell (704), and discharges it from the side of the guide shell (704) away from the adjacent guide shell (703) to complete the guidance of the large-diameter material. S7: When the material inside the rotating shell (7) is not discharged in time and is full, the material is guided out from all the discharge shells (702) and then ground by the extrusion roller (16) and the second grinding ring (15) with the grinding roller (9) and the first grinding ring (401); S8: During the material processing, powder with the required particle size is discharged from the discharge section (6).

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