A calcium carbonate drying device

Abstract

The application relates to the technical field of calcium carbonate processing, in particular to a calcium carbonate drying device, which comprises a main body and a feeding pipe fixed on the main body, a screening assembly is rotationally arranged in the main body, and a separation bin capable of separating calcium carbonate crystal particles of different sizes is arranged on the screening assembly; through the structure of the screening assembly arranged in the drying cylinder, the crushing and filtering screening processes are all in a drying environment, the drying rate of the calcium carbonate is accelerated, and the problem that the calcium carbonate is aggregated into blocks again in the conveying process is avoided; through the spiral guide plate structure, the qualified calcium carbonate powder enters the guide plate, hot air is introduced by using a hot air blower, and the calcium carbonate powder moves spirally downward along the gap between the guide plates; the calcium carbonate powder is dried through the continuous guidance of the hot air; the space in the guide plate is relatively closed, and the long moving path of the calcium carbonate on the guide plate makes the drying efficiency higher.

Description

Technical Field

[0001] This invention relates to the field of calcium carbonate processing technology, specifically to a calcium carbonate drying apparatus. Background Technology

[0002] Polyethylene (PE) is widely used in packaging, agriculture, injection molding, pipes, daily necessities and other fields due to its excellent toughness, processability and cost performance. Heavy calcium carbonate has always been the mainstream filler for polyethylene masterbatch due to its abundant resources and low price.

[0003] In the existing technology, during the calcium carbonate drying process, the large volume of calcium carbonate is crushed into small particles, and the calcium carbonate particles are filtered through a sieving component. This makes the calcium carbonate particles smaller and more easily heated, reducing the drying time and achieving the same drying effect.

[0004] However, when calcium carbonate particles enter the drying device through the screening component, the mechanical vibration generated by the operation of the crushing device and the influence of the hot air flow in the drying device cause some calcium carbonate particles to reverse through the screening component and enter the crushing mechanism, affecting the calcium carbonate processing efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a calcium carbonate drying apparatus to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A calcium carbonate drying device includes a main body and a feed pipe fixed on the main body. A screening assembly is rotatably arranged inside the main body. The screening assembly is configured with a separation chamber capable of separating calcium carbonate crystal particles of different sizes, and a crushing chamber located below the separation chamber. The crushing chamber is equipped with crushing blades for crushing large calcium carbonate particles, and the separation chamber is equipped with grinding rollers for fine grinding of calcium carbonate powder. The screening assembly is equipped with a conveying assembly that transports the crushed calcium carbonate particles in the crushing chamber upwards. The conveying assembly includes a rotating column that rotates relative to the screening assembly, and the grinding roller and crushing blades are both disposed on the rotating column. The drying assembly includes a drying cylinder fitted outside the screening assembly. The drying cylinder is provided with an air guide pipe for introducing hot air, and the air guide pipe is connected to an external hot air blower. The inner wall of the drying cylinder is provided with a spirally wound guide plate, and the guide plate is connected to a collection pipe.

[0007] Furthermore, the separation chamber is cylindrical, and several through holes are provided on the side wall of the separation chamber. The through holes are inclined. The crushing chamber is a frustum-shaped chamber that is wider at the top and narrower at the bottom. The cavities of the separation chamber and the crushing chamber are connected. A discharge pipe for removing some impurities is also provided below the crushing chamber.

[0008] Furthermore, the rotating column is vertically arranged in the middle of the screening assembly, and the bottom of the rotating column extends from the bottom of the crushing chamber. A sealing ring is provided at the connection between the rotating column and the bottom of the crushing chamber, and the rotating column is rotatably connected to the screening assembly.

[0009] Furthermore, the rotating column is rotatably installed inside the main body, the screening component is rotatably installed on the rotating column, a second gear is fixedly connected to the bottom of the rotating column, a first gear is installed below the screening component, the first gear and the second gear rotate coaxially, and the radius of the first gear is larger than the radius of the second gear.

[0010] Furthermore, a gear set is provided on one side of the first gear and the second gear. The gear set is driven by a motor. The gear set includes a third gear that meshes with the first gear and a fourth gear that meshes synchronously with the second gear. The shape of the third gear is the same as that of the second gear, and the shape of the fourth gear is the same as that of the first gear.

[0011] Furthermore, the side wall of the rotating column is provided with several inlet grooves that connect the inside and outside of the rotating column cavity. The rotating column is a cavity structure with an opening at the top. A worm gear is also provided in the cavity of the rotating column. The upper end of the worm gear is fixed on a connecting frame. The connecting frame is located at the bottom of the feed pipe and inside the screening assembly. The radius of the connecting frame is larger than the opening radius of the rotating column.

[0012] Furthermore, a number of crushing blades are also installed on the side wall of the rotating column above the inlet groove, and the height of the crushing blades is lower than the bottom of the separation chamber; The rotating column is slidably connected to a grinding roller on the side wall inside the separation chamber. The grinding roller is rotatably mounted on a bracket. A sliding column is fixed on the side of the bracket facing the rotating column. The sliding column is slidably mounted inside the fixed column. A limit block is fixedly connected to the end of the sliding column. A spring is installed between the limit block and the fixed column.

[0013] Furthermore, the drying cylinder is fixed to the top inner wall of the main body, and the drying cylinder completely encloses the screening component. The guide plate is provided with a sealing layer at the outer edge of the separation chamber to form a closed space with the outer wall of the separation chamber. A baffle is fixedly connected to the inner side of the guide plate below the separation chamber, and several electric heating tubes are installed on the inner wall of the baffle.

[0014] Furthermore, the direction in which the air duct enters the drying cylinder is consistent with the spiral direction of the guide plate, and the air duct is configured as several ducts, which are respectively arranged in several layers at the top of the spiral of the guide plate.

[0015] Furthermore, the collection pipe is located below the outlet of the guide plate, the collection pipe is fixed to the main body, the lower part of the collection pipe extends out of the lower part of the main body, and the bottom of the main body is also provided with a water outlet pipe for draining internal water.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention uses a through-hole structure to allow calcium carbonate particles that meet the specifications in the screening component to enter the drying component through the through-hole. By setting the through-hole at an angle, it avoids the mechanical vibration generated by the operation of the crushing device and the influence of the hot air flow in the drying device, which would cause some calcium carbonate particles to reverse through the screening component and enter the crushing mechanism, thereby improving the overall efficiency of calcium carbonate production. 2. The structure of setting the screening components inside the drying cylinder ensures that both the crushing and filtration screening processes are conducted in a dry environment, accelerating the drying rate of calcium carbonate and preventing the calcium carbonate from re-aggregating into lumps during transportation; 3. Through the rotating separation chamber structure, some of the calcium carbonate in the separation chamber is subjected to centrifugal force and thrown onto the inner wall of the separation chamber for preliminary dehydration. Some of the qualified granular powder is thrown into the drying cylinder through the aperture for secondary dehydration and drying. Impurities, debris and larger calcium carbonate particles are intercepted. The larger calcium carbonate powder particles are re-ground by the grinding roller, so that the calcium carbonate particles are repeatedly crushed until they can enter the drying cylinder through the aperture. 4. Through the structure of the crushing blades, large particles and lumps of calcium carbonate are crushed into small particles. The crushed small particles of calcium carbonate are screened through the inlet trough of the rotating column and conveyed to the separation chamber by the conveying component. They are then finely ground into particles that can pass through the pores of the separation chamber. The multi-stage crushing and multi-stage filtration structure ensures that the calcium carbonate is thoroughly crushed, improving the subsequent drying effect. 5. The spiral guide plate structure allows qualified calcium carbonate powder to enter the guide plate. A hot air blower introduces hot airflow, which moves spirally downwards along the gaps between the guide plates. With the continuous guidance of hot air, the calcium carbonate powder is dried. The space inside the guide plate is relatively closed, and the calcium carbonate has a long movement path on the guide plate, resulting in higher drying efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2This is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B; Figure 5 This is a top view of the screening component structure of the present invention; Figure 6 This is a schematic diagram of the longitudinal section structure of the present invention; Figure 7 This is a schematic diagram of the gear set connection structure of the present invention; Figure 8 This is a schematic diagram of the conveying component structure of the present invention; Figure 9 This is a schematic diagram of the drying component structure of the present invention; Figure 10 This is an exploded schematic diagram of the drying component of the present invention.

[0018] In the diagram: 1. Main body; 2. Feed pipe; 21. Connecting frame; 3. Screening assembly; 31. Separation chamber; 32. Crushing chamber; 33. First gear; 34. Outlet pipe; 35. Through hole; 4. Conveying assembly; 41. Rotating column; 42. Inlet trough; 43. Second gear; 44. Worm gear; 5. Gear set; 51. Third gear; 52. Fourth gear; 6. Grinding roller; 61. Support; 62. Sliding column; 63. Limiting block; 64. Fixing column; 65. Spring; 66. Crushing blades; 7. Drying assembly; 71. Drying cylinder; 72. Guide plate; 73. Baffle; 74. Air duct; 75. Electric heating tube; 8. Collection pipe. Detailed Implementation

[0019] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0020] Please see Figures 1 to 9 The present invention provides a technical solution: a calcium carbonate drying device, including a main body 1 and a feed pipe 2 fixed on the main body 1. A screening component 3 is rotatably arranged inside the main body 1. The screening component 3 is configured with a separation chamber 31 capable of separating calcium carbonate crystal particles of different sizes, and a crushing chamber 32 located below the separation chamber 31. Large calcium carbonate crystals entering the crushing chamber 32 are broken down into smaller particles. These smaller calcium carbonate particles then enter the separation chamber 31 for further separation, allowing them to pass through the separation chamber 31 and enter the outside world after they are reduced to a mesh size of less than 20.

[0021] The crushing chamber 32 is equipped with crushing blades 66 for crushing large calcium carbonate particles, and the separation chamber 31 is equipped with grinding rollers 6 for fine grinding of calcium carbonate powder. The crushing blades 66 break large calcium carbonate particles or blocks into small particles, and the grinding rollers 6 grind the small calcium carbonate particles into finer particles of less than 20 mesh, so that they can pass through the separation chamber 31 into the outside world to separate out impurities and debris mixed in.

[0022] The screening component 3 is provided with a conveying component 4 for conveying the crushed calcium carbonate particles in the crushing chamber 32 upward. The conveying component 4 includes a rotating column 41 that rotates relative to the screening component 3. The grinding roller 6 and the crushing blade 66 are both arranged on the rotating column 41. The conveying component 4 conveys the small calcium carbonate particles crushed by the crushing blade 66 upwards to the separation chamber 31, where the separation chamber 31 screens them. The small particles that fail the screening are conveyed upwards repeatedly by the conveying component 4 until the calcium carbonate is completely ground to the standard specifications.

[0023] The drying assembly 7 includes a drying cylinder 71 sleeved outside the screening assembly 3. The drying cylinder 71 is provided with a guide pipe 74 for introducing hot air. The guide pipe 74 is connected to an external hot air blower. The inner wall of the drying cylinder 71 is provided with a spirally coiled guide plate 72. The guide plate 72 is connected to a collection pipe 8.

[0024] The calcium carbonate powder sieved from the separation chamber 31 enters the guide plate 72. The spiral design of the guide plate 72 extends the movement path of the calcium carbonate powder from the drying component 7, thereby increasing the drying time. Through the structure of the air duct 74, the hot air generated by the hot air blower is introduced into the spiral groove of the guide plate 72. While drying the calcium carbonate powder entering the guide plate 72, the calcium carbonate powder is driven to spiral downward from the guide plate 72 until it is discharged from the bottom of the guide plate 72. The dried calcium carbonate powder is then guided and collected by the collection pipe 8.

[0025] The separation chamber 31 is cylindrical, and its side wall has several through holes 35 with a diameter of 20 mesh. This allows the ground calcium carbonate powder to pass through the holes, while non-compliant particles, impurities, and debris are screened out. The through holes 35 are inclined to prevent the calcium carbonate powder in the guide plate 72 from flowing back into the separation chamber 31 due to the influence of hot air. The crushing chamber 32 is a frustum-shaped chamber that is wider at the top and narrower at the bottom. The chambers of the separation chamber 31 and the crushing chamber 32 are connected. The raw material in the separation chamber 31 can fall into the crushing chamber 32 along the cylindrical wall and flow into the lower middle part along the inclined inner wall of the crushing chamber 32. A discharge pipe 34 is also provided at the bottom of the crushing chamber 32 to remove some impurities. For some impurities and debris that cannot be crushed, after the equipment is turned off, they slide to the bottom of the crushing chamber 32 by their own weight and are removed through the discharge pipe 34.

[0026] The rotating column 41 is vertically arranged in the middle of the screening component 3. The bottom of the rotating column 41 extends from the bottom of the crushing chamber 32. A sealing ring is provided at the connection between the rotating column 41 and the bottom of the crushing chamber 32. The rotating column 41 is rotatably connected to the screening component 3.

[0027] The rotating column 41 is rotatably installed inside the main body 1, and the screening component 3 is rotatably installed on the rotating column 41. A second gear 43 is fixedly connected to the bottom of the rotating column 41, and a first gear 33 is installed below the screening component 3. The first gear 33 and the second gear 43 rotate coaxially, and the radius of the first gear 33 is larger than the radius of the second gear 43.

[0028] A gear set 5 is provided on one side of the first gear 33 and the second gear 43. The gear set 5 is driven by a motor. The gear set 5 includes a third gear 51 that meshes with the first gear 33 and a fourth gear 52 that meshes synchronously with the second gear 43. The shape of the third gear 51 is the same as that of the second gear 43, and the shape of the fourth gear 52 is the same as that of the first gear 33.

[0029] The third gear 51 and the fourth gear 52 of the gear set 5 are coaxial and have the same rotational angular velocity. The fourth gear 52 has a larger radius and its linear velocity is greater than that of the third gear 51. After the third gear 51 meshes with the first gear 33 and the fourth gear 52 meshes with the first gear 33, the speed of the small gear drives the speed of the large gear to decrease, and the speed of the large gear drives the speed of the small gear to increase. That is, the speed of the second gear 43 is greater than that of the first gear 33. In other words, the rotating column 41 has a higher speed relative to the screening component 3. During the rotation of the screening component 3, the centrifugal force generated throws the calcium carbonate particles inside toward its inner wall, using centrifugal force to dehydrate the calcium carbonate and assist in the drying process. At the same time, the centrifugal force generates initial separation of calcium carbonate particles. Larger particles will automatically slide into the crushing chamber 32 due to gravity, while smaller particles will be thrown toward the separation chamber 31 due to centrifugal force. The rotating column 41 with a higher rotation speed drives the grinding roller 6 and the crushing blades 66 to crush large pieces and finely grind the calcium carbonate in the screening component 3.

[0030] The rotating column 41 has several inlet grooves 42 on its side wall, connecting the inside and outside of the cavity. The inclined structure below the crushing chamber 32 guides calcium carbonate towards the inlet grooves 42. Small calcium carbonate particles can enter the rotating column 41 through the inlet grooves 42, while large calcium carbonate particles are repeatedly crushed in the crushing chamber 32 until they can pass through the inlet grooves 42. The rotating column 41 is a hollow structure with an opening at the top. A worm gear 44 is also provided inside the cavity of the rotating column 41. The relative rotation of the rotating column 41 and the worm gear 44 allows calcium carbonate to enter the cavity through the inlet grooves 42. Calcium carbonate inside the rotating column 41 is conveyed upwards. The upper end of the worm gear 44 is fixed on the connecting frame 21. The connecting frame 21 is located at the bottom of the feed pipe 2 and inside the screening assembly 3. The radius of the connecting frame 21 is larger than the opening radius of the rotating column 41 to prevent the calcium carbonate fed into the feed pipe 2 from entering the rotating column 41 through the opening. The conveying assembly 4 conveys the calcium carbonate upwards. The upwardly conveyed calcium carbonate flows out from the opening above the rotating column 41 and is thrown outwards by the rotation of the outer wall of the rotating column 41, and then undergoes multiple dehydration and grinding processes on the inner wall of the separation chamber 31.

[0031] The rotating column 41 is located on the side wall above the inlet groove 42 and is also equipped with a number of crushing blades 66. The height of the crushing blades 66 is lower than the bottom of the separation chamber 31. Large calcium carbonate particles fall directly into the crushing chamber 32 due to their own weight, and are broken down and crushed by the high-speed rotation of the crushing blades 66.

[0032] The rotating column 41 is slidably connected to the side wall inside the separation chamber 31, and the grinding roller 6 is rotatably mounted on the bracket 61. The bracket 61 is fixed to the side facing the rotating column 41, and the sliding column 62 is slidably mounted inside the fixed column 64. The end of the sliding column 62 is fixedly connected to the limiting block 63, and a spring 65 is installed between the limiting block 63 and the fixed column 64. Under the elastic force of the spring 65, the grinding roller 6 can be tightly attached to the inner wall of the separation chamber 31 regardless of whether the equipment is at low or high speed. The friction between the grinding roller 6 and the inner wall of the separation chamber 31 causes the grinding roller 6 to rotate, grinding the calcium carbonate that is tightly attached to the inner wall of the separation chamber 31 by centrifugal force.

[0033] The drying cylinder 71 is fixed to the top inner wall of the main body 1, and the drying cylinder 71 completely encloses the screening assembly 3. The guide plate 72 has a sealing layer at its outer edge outside the separation chamber 31, forming a closed space with the outer wall of the separation chamber 31. This allows the centrifugal force of the separation chamber 31 to throw the standard calcium carbonate powder onto the guide plate 72, preventing it from leaking out from the gap between the guide plate 72 and the separation chamber 31. A baffle 73 is fixedly connected to the inner side of the guide plate 72 below the separation chamber 31, allowing calcium carbonate to enter... After reaching the guide plate 72 below the separation chamber 31, the baffle 73 prevents the calcium carbonate from moving directly from the guide plate 72 after it reaches the separation chamber 31. Several electric heating tubes 75 are installed on the inner wall of the baffle 73. The structure of the electric heating tubes 75 keeps the part below the guide plate 72 in a dry and high-temperature environment, preventing the hot air introduced by the air duct 74 from gradually dissipating heat and causing the temperature to drop as it moves in the slots between the guide plates 72. This would prevent water vapor in the part below the guide plate 72 from cooling and liquefying, and then mixing back into the calcium carbonate powder.

[0034] The direction in which the air duct 74 enters the drying cylinder 71 is consistent with the spiral direction of the guide plate 72. The air duct 74 is provided in several parts and is respectively arranged in several layers at the top of the spiral of the guide plate 72.

[0035] The air duct 74 blows calcium carbonate along the guide plate 72 spirally downwards. By reducing the drying space and increasing the drying path, the drying efficiency is improved. The air duct 74 introduces hot air from the external hot air blower into the slot of the guide plate 72, so that the hot air flow moves spirally downwards along the guide plate 72. The structure of setting multiple air ducts 74 increases the blowing air pressure, so as to better drive the calcium carbonate powder downwards along the guide plate 72.

[0036] The collection pipe 8 is located below the outlet of the guide plate 72 and is fixed to the main body 1. The lower part of the collection pipe 8 extends below the main body 1 to guide and collect the dried calcium carbonate powder. The bottom of the main body 1 is also provided with a water outlet pipe to drain the internal water. The dried calcium carbonate powder and water vapor are discharged from below the guide plate 72. The water vapor enters the main body 1. When the equipment is not in use, the temperature drops and the water vapor liquefies into water and accumulates inside the equipment. The internal water can be discharged through the water outlet pipe.

[0037] The specific method is as follows: calcium carbonate is fed into the screening component 3 through the feed pipe 2 and blocked by the connecting frame 21. Large particles and blocky calcium carbonate enter the crushing chamber 32 and are crushed by the crushing blades 66. Some small particles of calcium carbonate are thrown onto the inner wall of the separation chamber 31 by centrifugal force for dehydration and grinding by the grinding rollers 6. The calcium carbonate powder that meets the specifications is thrown into the drying component 7 through the aperture for secondary dehydration. The calcium carbonate powder that does not meet the specifications is continuously ground in the separation chamber 31. By controlling the gear set 5 to rotate at different speeds periodically by the motor, some calcium carbonate particles enter the crushing chamber 32 below and enter the rotating column 41 along the inlet trough 42. They are then conveyed to the separation chamber 31 by the conveying component 4. As the rotation speed of the equipment increases periodically, they are thrown against the inner wall of the separation chamber 31 by centrifugal force, thus achieving multiple dehydration. The calcium carbonate entering the drying assembly 7 is dried by the hot air introduced by the air duct 74 and is conveyed downward along the guide plate 72. The hot air can also enter the separation chamber 31 through the aperture to perform a certain drying treatment on the calcium carbonate being crushed, thereby improving the overall drying efficiency.

[0038] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A calcium carbonate drying device, comprising a main body (1), a screening assembly (3), and a feed pipe (2) fixed on the main body (1), characterized in that: The screening component (3) is configured with a separation chamber (31) capable of separating particles of calcium carbonate crystal size, and a crushing chamber (32) located below the separation chamber (31). The separation chamber (31) is cylindrical, and a number of through holes (35) for filtering calcium carbonate particles are provided on the side wall of the separation chamber (31). The through holes (35) are inclined. The crushing chamber (32) is a frustum with a wider top and a narrower bottom. The cavities of the separation chamber (31) and the crushing chamber (32) are connected. The crushing chamber (32) is equipped with crushing blades (66) for crushing large calcium carbonate particles, and the separation chamber (31) is equipped with grinding rollers (6) for fine grinding of calcium carbonate powder. Below the crushing chamber (32) is also a discharge pipe (34) for removing some impurities.

2. The calcium carbonate drying apparatus according to claim 1, characterized in that, The screening component (3) is provided with a conveying component (4) for conveying the crushed calcium carbonate particles in the crushing chamber (32) upward. The conveying component (4) includes a rotating column (41) that rotates relative to the screening component (3). The grinding roller (6) and the crushing blade (66) are both arranged on the rotating column (41).

3. The calcium carbonate drying apparatus according to claim 2, characterized in that, The rotating column (41) is vertically arranged in the middle of the screening assembly (3). The bottom of the rotating column (41) extends from the bottom of the crushing chamber (32). A sealing ring is provided at the bottom connection between the rotating column (41) and the crushing chamber (32). The rotating column (41) is rotatably connected to the screening assembly (3).

4. The calcium carbonate drying apparatus according to claim 3, characterized in that, The rotating column (41) is rotatably installed inside the main body (1), and the screening component (3) is rotatably installed on the rotating column (41). A second gear (43) is fixedly connected to the bottom of the rotating column (41), and a first gear (33) is installed below the screening component (3). The first gear (33) and the second gear (43) rotate coaxially, and the radius of the first gear (33) is greater than the radius of the second gear (43).

5. The calcium carbonate drying apparatus according to claim 4, characterized in that, A gear set (5) is provided on one side of the first gear (33) and the second gear (43). The gear set (5) is driven by a motor. The gear set (5) includes a third gear (51) that meshes with the first gear (33) and a fourth gear (52) that meshes synchronously with the second gear (43). The shape of the third gear (51) is the same as that of the second gear (43), and the shape of the fourth gear (52) is the same as that of the first gear (33).

6. The calcium carbonate drying apparatus according to claim 3, characterized in that, The rotating column (41) has several inlet grooves (42) on its side wall that connect the inside and outside of the cavity of the rotating column (41). The rotating column (41) is a cavity structure with an opening at the top. A worm gear (44) is also provided in the cavity of the rotating column (41). The upper end of the worm gear (44) is fixed on the connecting frame (21). The connecting frame (21) is located at the bottom of the feed pipe (2) and inside the screening assembly (3). The radius of the connecting frame (21) is greater than the opening radius of the rotating column (41).

7. The calcium carbonate drying apparatus according to claim 6, characterized in that, The rotating column (41) is located on the side wall above the inlet groove (42) and a number of crushing blades (66) are also installed thereon. The height of the crushing blades (66) is lower than the bottom of the separation chamber (31). The rotating column (41) is slidably connected to the side wall inside the separation chamber (31) with a grinding roller (6). The grinding roller (6) is rotatably mounted on the bracket (61). A sliding column (62) is fixed on the side of the bracket (61) facing the rotating column (41). The sliding column (62) is slidably mounted inside the fixed column (64). A limit block (63) is fixedly connected to the end of the sliding column (62). A spring (65) is installed between the limit block (63) and the fixed column (64).

8. The calcium carbonate drying apparatus according to claim 1, characterized in that, A drying component (7) is provided outside the screening component (3). The drying component (7) includes a drying cylinder (71) sleeved outside the screening component (3). The drying cylinder (71) is fixed on the top inner wall of the main body (1). The drying cylinder (71) completely encloses the screening component (3). A sealing layer is provided on the edge of the guide plate (72) outside the separation chamber (31) to form a closed space with the outer wall of the separation chamber (31). A baffle (73) is fixedly connected to the inner side of the guide plate (72) below the separation chamber (31). Several electric heating tubes (75) are installed on the inner wall of the baffle (73).

9. The calcium carbonate drying apparatus according to claim 8, characterized in that, The drying cylinder (71) is provided with a guide pipe (74) for introducing hot air. The guide pipe (74) is connected to an external hot air blower. The inner wall of the drying cylinder (71) is provided with a spirally coiled guide plate (72). The guide plate (72) is connected to a collection pipe (8). The direction in which the air duct (74) enters the drying cylinder (71) is consistent with the spiral direction of the guide plate (72). The air duct (74) is configured as several, and is respectively arranged in several layers at the top of the spiral of the guide plate (72).

10. The calcium carbonate drying apparatus according to claim 9, characterized in that, The collecting pipe (8) is located below the outlet of the guide plate (72). The collecting pipe (8) is fixed on the main body (1). The collecting pipe (8) extends below the main body (1). The bottom of the main body (1) is also provided with a water outlet pipe to drain the internal water.

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