Calcium carbonate grading, grinding and screening integrated device and control method thereof

Abstract

The invention discloses a calcium carbonate grading, grinding and screening integrated device and a control method thereof.The calcium carbonate grading, grinding and screening integrated device comprises an outer box body, a circulating grinding mechanism and a secondary grinding mechanism are sequentially installed in the outer box body from top to bottom, and the circulating grinding mechanism is in transmission connection with the secondary grinding mechanism through a transmission mechanism; the circulating grinding mechanism comprises a screening roller rotationally connected with the outer box body, a first-stage grinding assembly is installed in the screening roller, during work, the first-stage grinding assembly preliminarily grinds and crushes calcium carbonate, and the screening roller screens the ground and crushed calcium carbonate and cooperates with the screening roller to circularly grind and crush the calcium carbonate. By arranging the circulating grinding mechanism and the secondary grinding mechanism, multi-stage grinding and screening can be carried out on calcium carbonate, screening can be carried out in the grinding process, the grinding speed and effect are improved, the machining procedures are reduced, and rapid powder discharging is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of calcium carbonate processing, and in particular relates to a calcium carbonate grading, grinding and screening integrated device and a control method thereof. Background Art

[0002] Calcium carbonate (CaCO3) powder is made by grinding natural carbonate minerals such as calcite, marble, and limestone. It is a widely used inorganic filler with the advantages of high chemical purity, high inertness, no chemical reaction, good thermal stability, no decomposition below 400°C, high whiteness, low oil absorption, low refractive index, soft texture, dryness, no crystal water, low hardness, small abrasion value, non-toxicity, tasteless, odorless, and good dispersibility.

[0003] The existing grinding and screening device completes the grinding process after rolling and grinding the calcium carbonate once. However, since the coarse calcium carbonate material is only ground and crushed once, it is difficult to further fully crush the calcium carbonate with smaller particles, thereby reducing the powder making effect after the calcium carbonate grinding process. Summary of the invention

[0004] The present invention aims at solving the problems in the prior art and proposes the following technical solutions:

[0005] The integrated device for graded grinding and screening of calcium carbonate comprises an outer box, wherein a circulating grinding mechanism and a secondary grinding mechanism are sequentially installed inside the outer box from top to bottom, and the circulating grinding mechanism is connected to the secondary grinding mechanism through a transmission mechanism;

[0006] The circulating grinding mechanism includes a screening drum rotatably connected to the outer box body, and a primary grinding assembly is installed inside the screening drum. When working, the primary grinding assembly preliminarily grinds and crushes the calcium carbonate, and the screening drum screens the ground and crushed calcium carbonate, and cooperates with the screening drum for cyclic grinding and crushing;

[0007] The secondary grinding mechanism comprises a grinding bowl fixedly connected to the outer box body, a secondary grinding assembly is arranged inside the grinding bowl, and the primary grinding assembly controls the secondary grinding assembly to swing back and forth for grinding through a transmission mechanism.

[0008] As a preferred embodiment of the above technical solution, the first-level grinding assembly includes several grinding rollers, the inner ring of each grinding roller is fixedly sleeved with a roller shaft, the outer ring of the roller shaft is rotatably sleeved with a partition, the partition is fixedly connected to the outer box body through a fixing rod, and the partition is rotatably sleeved in the inner ring of the screening drum, one end of one of the roller shafts is connected to a motor, the motor is installed on the inner wall of the outer box body, the outer rings of several roller shafts are fixedly sleeved with gears 2, and the two gears 2 are meshed for transmission.

[0009] As a preferred embodiment of the above technical solution, a plurality of paddles are fixedly connected to the inner wall of the screening drum, and the inner ring fixing sleeve of the screening drum is provided with an inner gear ring, and the outer ring fixing sleeve of one of the roller shafts is provided with gear 1, and the gear 1 is meshed with the inner gear ring for transmission.

[0010] As a preferred embodiment of the above technical solution, a sliding sleeve is fixedly installed on the inner wall of the outer box body, the screening drum is sleeved in the inner ring of the sliding sleeve, and balls are arranged between the sliding sleeve and the screening drum.

[0011] As a preferred embodiment of the above technical solution, the secondary grinding assembly includes grinding roller 2, which is fixedly connected to a swing shaft via a connecting rod, and the swing shaft is rotatably connected to the side wall of the outer box body. One end of one of the swing shafts passes through the outer box body and is fixedly connected to gear 3, and a torsion spring is installed between gear 3 and the side wall of the outer box body.

[0012] As a preferred embodiment of the above technical solution, the transmission mechanism includes a transmission shaft rotatably connected to the outer wall of the outer box body, the outer ring fixed sleeve of the transmission shaft is provided with a driven wheel and a half gear, the driven wheel and the gear are in three-meshing transmission, one of the roller shafts passes through the side wall of the outer box body and is fixedly connected to a driving wheel, and the half gear is connected to the driving wheel through a belt.

[0013] As a preferred embodiment of the above technical solution, a collecting hopper fixed on the inner wall of the outer box body is arranged between the screening drum and the grinding bowl, a recovery box is arranged under the grinding bowl, and a feed pipe is provided on the inner ring fixed sleeve of the partition, and the end of the feed pipe away from the partition passes through the side wall of the outer box body.

[0014] The control method of the integrated device for grading, grinding and screening of calcium carbonate comprises the following steps:

[0015] S1, primary grinding and screening:

[0016] Pour calcium carbonate from the feed pipe to the top of grinding roller one, start the motor to drive two grinding rollers one to grind and crush the calcium carbonate through the meshing of two gears two, and the crushed calcium carbonate falls to the bottom of the screening drum for screening;

[0017] S2, Circulation Grinding and Screening:

[0018] The meshing of gear 1 and the inner gear ring drives the screening drum to rotate. The calcium carbonate that falls to the bottom of the screening drum in S1 and is not screened out will be pushed to the top of grinding roller 1 by the paddle to be re-grinded and crushed until the calcium carbonate is screened out from the inside of the screening drum.

[0019] S3, Secondary Grinding and Screening:

[0020] After grinding and screening by S1, the calcium carbonate will fall into the grinding bowl. The roller shaft will drive the driven wheel to rotate continuously through the transmission cooperation of the driving wheel, belt and half gear. Through the meshing of the driven wheel and gear three and the elastic cooperation of the torsion spring to gear three, the grinding roller two will continuously swing back and forth inside the grinding bowl to grind the calcium carbonate. Finally, the calcium carbonate will fall into the recycling box from the sieve hole for recycling.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention can perform multi-stage grinding and screening of calcium carbonate by setting a circulating grinding mechanism and a secondary grinding mechanism. The device can screen at the same time during the grinding process, thereby improving the grinding speed and effect, reducing the processing steps, and achieving rapid powder output;

[0023] 2. The grinding roller of the present invention will rotate on its own to grind and crush the calcium carbonate, and will not rotate along with the screening drum. The rotation of the screening drum will screen the ground and crushed calcium carbonate. When there is unqualified calcium carbonate remaining after grinding and crushing, it will be brought to the top of the grinding roller by the paddle to be ground and crushed again until it is qualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The structure diagram of the integrated device for graded grinding and screening of calcium carbonate in the embodiment is shown;

[0025] Figure 2 What is shown is a schematic diagram of the structure of the outer box in the embodiment;

[0026] Figure 3 What is shown is a schematic diagram of the structure of the circulating grinding mechanism in the embodiment;

[0027] Figure 4 Shown is a schematic diagram of the structure of the inner gear ring and gear 1 in the embodiment;

[0028] Figure 5 What is shown is a schematic diagram of the structure of the grinding roller 1 in the embodiment;

[0029] Figure 6 Shown is a schematic structural diagram of a secondary grinding mechanism in an embodiment.

[0030] Description of reference numerals:

[0031] 11. Outer box; 12. Sliding sleeve; 13. Feed pipe; 14. Collecting hopper; 15. Recovery box; 20. Circulating grinding mechanism; 21. Screening drum; 22. Paddle; 23. Partition; 24. Fixed rod; 25. Grinding roller one; 26. Roller shaft; 27. Motor; 28. Internal gear ring; 29. ​​Gear one; 210. Gear two; 30. Secondary grinding mechanism; 31. Grinding bowl; 32. Screening hole; 33. Grinding roller two; 34. Connecting rod; 35. Swing shaft; 36. Gear three; 37. Torsion spring; 40. Transmission mechanism; 41. Transmission shaft; 42. Driven wheel; 43. Half gear; 44. Driving wheel; 45. Belt. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0033] Example 1

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the integrated device for graded grinding and screening of calcium carbonate comprises an outer box body 11, inside of which a circulating grinding mechanism 20 and a secondary grinding mechanism 30 are sequentially installed from top to bottom, and the circulating grinding mechanism 20 is transmission-connected to the secondary grinding mechanism 30 via a transmission mechanism 40; the circulating grinding mechanism 20 comprises a screening drum 21 rotationally connected to the outer box body 11, inside of which a primary grinding assembly is installed, when in operation, the primary grinding assembly preliminarily grinds and crushes the calcium carbonate, the screening drum 21 screens the ground and crushed calcium carbonate, and cooperates with the screening drum 21 for cyclic grinding and crushing; the secondary grinding mechanism 30 comprises a grinding bowl 31 fixedly connected to the outer box body 11, inside of which a secondary grinding assembly is arranged, and the primary grinding assembly controls the secondary grinding assembly to swing back and forth for grinding via the transmission mechanism 40.

[0035] It should be noted that by setting up the circulating grinding mechanism 20 and the secondary grinding mechanism 30, calcium carbonate can be ground and screened in multiple stages. The device can screen at the same time during the grinding process, thereby improving the grinding speed and effect, reducing the processing steps, and achieving rapid powder output.

[0036] like Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the primary grinding assembly includes a plurality of grinding rollers 25, the inner ring of each grinding roller 25 is fixedly sleeved with a roller shaft 26, the outer ring of the roller shaft 26 is rotatably sleeved with a partition 23, the partition 23 is fixedly connected to the outer box body 11 through a fixing rod 24, and the partition 23 is rotatably sleeved in the inner ring of the screening drum 21, one end of one of the roller shafts 26 is connected to a motor 27, the motor 27 is installed on the inner wall of the outer box body 11, and the outer rings of the plurality of roller shafts 26 are fixedly sleeved with a gear 210, and the two gears 210 are meshed for transmission.

[0037] It should be noted that the output end of the motor 27 is connected to the end of the roller shaft 26, and the cavity formed by the combination of the screening drum 21 and the two partitions 23 is a grinding cavity, in which the grinding roller 25 is located, and the number of the grinding rollers 25 is preferably two.

[0038] Specifically, the motor 27 drives the roller 26 connected thereto to rotate, and the roller 26 drives another roller 26 to rotate through the meshing of the gear 210 connected thereto and another gear 210, so that the two grinding rollers 1 25 rotate in opposite directions, thereby grinding and crushing the calcium carbonate.

[0039] like Figure 3 and Figure 4 As shown, a plurality of paddles 22 are fixedly connected to the inner wall of the screening drum 21, and an inner ring fixed sleeve of the screening drum 21 is provided with an inner gear ring 28, and an outer ring fixed sleeve of a roller shaft 26 is provided with a gear 29, which meshes with the inner gear ring 28 for transmission.

[0040] Specifically, when the roller shaft 26 connected to the gear 29 rotates, the meshing transmission between the gear 29 and the inner gear ring 28 will drive the screening drum 21 to rotate together, and the partition 23 is fixed to the inner wall of the outer box body 11 through the fixing rod 24, so that the grinding roller 25 will only rotate on its own to grind and crush the calcium carbonate, and will not rotate with the screening drum 21. The rotation of the screening drum 21 will screen the ground and crushed calcium carbonate. When there is unqualified calcium carbonate retained after grinding and crushing, it will be brought to the top of the grinding roller 25 by the paddle 22 for re-grinding and crushing until it is qualified and can pass through the sieve hole of the screening drum 21.

[0041] like Figure 3 As shown, a sliding sleeve 12 is fixedly mounted on the inner wall of the outer box body 11 , the screening drum 21 is sleeved in the inner ring of the sliding sleeve 12 , and a ball bearing is arranged between the sliding sleeve 12 and the screening drum 21 .

[0042] It should be noted that, through the arrangement of the balls, the screening drum 21 can only rotate in the inner ring of the sliding sleeve 12 and cannot move laterally, thereby improving the rotation stability of the screening drum 21.

[0043] Example 2

[0044] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the integrated device for graded grinding and screening of calcium carbonate, compared with Example 1, the secondary grinding assembly of this embodiment includes a second grinding roller 33, and the second grinding roller 33 is fixedly connected to a swing shaft 35 through a connecting rod 34. The swing shaft 35 is rotatably connected to the side wall of the outer box body 11, and one end of one swing shaft 35 passes through the outer box body 11 and is fixedly connected to a gear three 36, and a torsion spring 37 is installed between the gear three 36 and the side wall of the outer box body 11.

[0045] It should be noted that the second grinding roller 33 is in contact with the arc-shaped inner wall of the grinding bowl 31, and the center of the arc-shaped side wall of the grinding bowl 31 overlaps with the axis of the swing shaft 35, so that when the swing shaft 35 drives the second grinding roller 33 to swing, the second grinding roller 33 can always keep in contact with the inner wall of the grinding bowl 31, and can further grind and crush the calcium carbonate that falls into the grinding bowl 31.

[0046] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the transmission mechanism 40 includes a transmission shaft 41 rotatably connected to the outer wall of the outer box body 11, and the outer ring of the transmission shaft 41 is fixedly sleeved with a driven wheel 42 and a half gear 43, and the driven wheel 42 is meshed with the gear three 36 for transmission. A roller shaft 26 passes through the side wall of the outer box body 11 and is fixedly connected to the driving wheel 44, and the half gear 43 is connected to the driving wheel 44 through a belt 45.

[0047] Specifically, the roller shaft 26 drives the driven wheel 42 to rotate continuously through the transmission cooperation of the driving wheel 44, the belt 45 and the half gear 43, and the meshing of the driven wheel 42 and the gear three 36 drives the swing shaft 35 to rotate. When the driven wheel 42 is disengaged from the gear three 36, the force of the torsion spring 37 pushes the gear three 36 and the swing shaft 35 to rotate in the opposite direction and return to the original position, so that the grinding roller 2 33 continuously swings back and forth with the swing shaft 35 as the axis, and the swing amplitude is less than 85°, so as to avoid scraping calcium carbonate to the outside of the grinding bowl 31.

[0048] like Figure 1 , Figure 2 and Figure 3 As shown, a collecting hopper 14 fixed on the inner wall of the outer box body 11 is arranged between the screening drum 21 and the grinding bowl 31, a recovery box 15 is arranged below the grinding bowl 31, and a feed pipe 13 is provided on the inner ring fixed sleeve of the partition 23, and the end of the feed pipe 13 away from the partition 23 passes through the side wall of the outer box body 11.

[0049] It should be noted that calcium carbonate is added to the interior of the screening drum 21 from the feed pipe 13, and the feed pipe 13 is located above the grinding roller 25. The collecting hopper 14 adopts a design of being wide at the top and narrow at the bottom, so that the calcium carbonate screened by the circulating grinding mechanism 20 can be concentrated and fall into the interior of the grinding bowl 31.

[0050] like Figures 1 to 6 As shown, the control method of the integrated device for grading, grinding and screening of calcium carbonate comprises the following steps:

[0051] S1, primary grinding and screening:

[0052] Calcium carbonate is poured from the feed pipe 13 to the top of the grinding roller 1 25, and the motor 27 is started to drive the two grinding rollers 1 25 to grind and crush the calcium carbonate through the meshing of the two gears 210, and the crushed calcium carbonate falls into the bottom of the screening drum 21 for screening;

[0053] S2, Circulation Grinding and Screening:

[0054] The meshing of the gear 1 29 and the inner gear ring 28 drives the screening drum 21 to rotate. The calcium carbonate that falls to the bottom of the screening drum 21 and is not screened out in S1 will be pushed to the top of the grinding roller 1 25 by the paddle 22 for re-grinding and crushing until the calcium carbonate is screened out from the inside of the screening drum 21.

[0055] S3, Secondary Grinding and Screening:

[0056] After grinding and screening by S1, the calcium carbonate will fall into the grinding bowl 31. The roller 26 will drive the driven wheel 42 to rotate continuously through the transmission cooperation of the driving wheel 44, the belt 45 and the half gear 43. Through the meshing of the driven wheel 42 and the gear three 36 and the elastic cooperation of the torsion spring 37 to the gear three 36, the grinding roller 2 33 will continuously swing back and forth inside the grinding bowl 31 to grind the calcium carbonate. Finally, the calcium carbonate will fall into the recovery box 15 from the sieve hole 32 for recovery.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. An integrated device for grading, grinding and screening of calcium carbonate, characterized in that: It comprises an outer box (11), wherein a circulating grinding mechanism (20) and a secondary grinding mechanism (30) are sequentially installed inside the outer box (11) from top to bottom, and the circulating grinding mechanism (20) is transmission-connected to the secondary grinding mechanism (30) via a transmission mechanism (40); The circulating grinding mechanism (20) comprises a screening drum (21) rotatably connected to the outer box (11), wherein a primary grinding assembly is installed inside the screening drum (21). When in operation, the primary grinding assembly preliminarily grinds and crushes the calcium carbonate, and the screening drum (21) screens the ground and crushed calcium carbonate, and cooperates with the screening drum (21) to perform circulating grinding and crushing; The secondary grinding mechanism (30) comprises a grinding bowl (31) fixedly connected to the outer box body (11), wherein a secondary grinding assembly is arranged inside the grinding bowl (31), and the primary grinding assembly controls the secondary grinding assembly to swing back and forth and grind via a transmission mechanism (40).

2. The calcium carbonate classification grinding and screening integrated device according to claim 1, characterized in that: The primary grinding assembly comprises a plurality of grinding rollers (25), the inner ring of each grinding roller (25) being fixedly sleeved with a roller shaft (26), the outer ring of the roller shaft (26) being rotatably sleeved with a partition (23), the partition (23) being fixedly connected to an outer box body (11) through a fixing rod (24), and the partition (23) being rotatably sleeved in the inner ring of a screening drum (21), one end of one of the roller shafts (26) being connected with a motor (27), the motor (27) being mounted on the inner wall of the outer box body (11), the outer rings of the plurality of roller shafts (26) being fixedly sleeved with a gear (210), and the two gears (210) being meshed for transmission.

3. The calcium carbonate graded grinding and screening integrated device according to claim 2, characterized in that: A plurality of paddles (22) are fixedly connected to the inner wall of the screening drum (21), and an inner ring fixed sleeve of the screening drum (21) is provided with an inner gear ring (28), and an outer ring fixed sleeve of the roller shaft (26) is provided with a gear 1 (29), and the gear 1 (29) is meshed with the inner gear ring (28) for transmission.

4. The calcium carbonate graded grinding and screening integrated device according to claim 2, characterized in that: A sliding sleeve (12) is fixedly mounted on the inner wall of the outer box body (11), the screening drum (21) is sleeved in the inner ring of the sliding sleeve (12), and a ball bearing is arranged between the sliding sleeve (12) and the screening drum (21).

5. The calcium carbonate classification grinding and screening integrated device according to claim 2 is characterized in that: The secondary grinding assembly comprises a second grinding roller (33), wherein the second grinding roller (33) is fixedly connected to a swing shaft (35) via a connecting rod (34), wherein the swing shaft (35) is rotatably connected to a side wall of an outer box body (11), wherein one end of one swing shaft (35) passes through the outer box body (11) and is fixedly connected to a third gear (36), wherein a torsion spring (37) is installed between the third gear (36) and the side wall of the outer box body (11).

6. The calcium carbonate classification grinding and screening integrated device according to claim 5, characterized in that: The transmission mechanism (40) comprises a transmission shaft (41) rotatably connected to the outer wall of the outer box body (11); a driven wheel (42) and a half gear (43) are fixedly sleeved on the outer ring of the transmission shaft (41); the driven wheel (42) is meshed with gear three (36) for transmission; one of the roller shafts (26) passes through the side wall of the outer box body (11) and is fixedly connected to a driving wheel (44); the half gear (43) is transmission-connected to the driving wheel (44) via a belt (45).

7. The calcium carbonate classification grinding and screening integrated device according to claim 2, characterized in that: A collecting hopper (14) fixed on the inner wall of the outer box body (11) is arranged between the screening drum (21) and the grinding bowl (31), a recovery box (15) is arranged below the grinding bowl (31), and a feed pipe (13) is arranged on the inner ring fixed sleeve of the partition (23), and the end of the feed pipe (13) away from the partition (23) passes through the side wall of the outer box body (11).

8. The control method of the calcium carbonate classification grinding and screening integrated device according to any one of claims 1 to 7, characterized in that: The following steps are included: S1, primary grinding and screening: Calcium carbonate is poured from a feed pipe (13) onto the top of a grinding roller (25), and a motor (27) is started to drive the two grinding rollers (25) to grind and crush the calcium carbonate through the meshing of two gears (210), and the crushed calcium carbonate falls into the bottom of a screening drum (21) for screening; S2, Circulation Grinding and Screening: The meshing of the gear 1 (29) and the inner gear ring (28) drives the screening drum (21) to rotate, and the calcium carbonate that falls to the bottom of the screening drum (21) and is not screened out in S1 will be pushed to the top of the grinding roller 1 (25) by the paddle (22) for re-grinding and crushing until the calcium carbonate is screened out from the inside of the screening drum (21); S3, Secondary Grinding and Screening: After being ground and screened by S1, the calcium carbonate falls into the grinding bowl (31). The roller shaft (26) drives the driven wheel (42) to rotate continuously through the driving wheel (44), the belt (45) and the half gear (43). The driven wheel (42) is meshed with the gear three (36) and the torsion spring (37) is elastically matched with the gear three (36). The grinding roller two (33) is constantly swung back and forth in the grinding bowl (31) to grind the calcium carbonate. Finally, the calcium carbonate falls from the sieve hole (32) into the recovery box (15) for recovery.

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