A fine grinding device for calcium carbonate

Abstract

The utility model discloses a kind of calcium carbonate fine grinding device, it is related to calcium carbonate production field, to solve the problem that the grinding device in prior art cannot carry out automatic screening and discharging when grinding calcium carbonate, affect production efficiency.The lower end of the middle part inside the grinding tank is fixedly provided with grinding plate, annular screen is fixedly connected between the outer side of the grinding plate and the inner wall of grinding tank, transmission shaft is rotatably connected in the middle part of the upper end of the grinding plate, connecting pipe is sleeved and liftingly connected outside the transmission shaft, C type fixed frame is fixedly connected on the both sides of the connecting pipe, grinding roller is rotatably connected on the fixed shaft, second arc-shaped scraper is fixedly connected on the both ends of the connecting pipe and on the upper end of the grinding plate, first arc-shaped scraper is fixedly connected outside C type fixed frame and on the upper end of annular screen, the collaborative working mechanism of annular screen and double arc-shaped scraper is adopted, the automation screening and material circulation of grinding process are realized, and production efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of calcium carbonate production, specifically a fine grinding device for calcium carbonate. Background Technology

[0002] Calcium carbonate (chemical formula CaCO3) is a common inorganic compound widely found in nature. It is a major component of minerals such as limestone, marble, and calcite, and is also a primary constituent of pearls, shells, and eggshells. Industrially, calcium carbonate is an important building material used in the production of cement, coatings, and plastic fillers. In agriculture, it is used as a soil conditioner. Food-grade calcium carbonate can be used as a calcium supplement or leavening agent. In the pharmaceutical field, it is used to prepare antacids. Furthermore, it is used in environmental protection to neutralize acidic wastewater. Its stability, low cost, and versatility make it a fundamental raw material in industries such as chemical and metallurgy. Calcium carbonate production requires grinding using grinding equipment.

[0003] For example, according to authorization announcement number CN213557436U, a fine grinding device for calcium carbonate includes an operating table. A first arc-shaped shell is fixedly connected to the center of the top surface of the operating table. A receiving plate is fixedly connected to the inner side wall of the bottom of the first arc-shaped shell. A second arc-shaped shell is fixedly connected to the top of the first arc-shaped shell near the receiving plate. A grinding mechanism is provided between the first and second arc-shaped shells. The grinding mechanism includes a grinding disc and a shaft. In this invention, a motor drives a first pulley at the bottom of the shaft to rotate via a belt, which in turn drives a sleeve to rotate. The rotation of the sleeve causes the grinding wheel to roll and grind the calcium carbonate powder on the grinding disc. When there is a large amount of calcium carbonate powder on the grinding disc, the sleeve, carrying the grinding wheel, slides upwards along the shaft while rotating, facilitating thorough grinding of the calcium carbonate powder and improving the grinding efficiency.

[0004] In the above-mentioned technology, after grinding calcium carbonate, the grinding device requires manual pulling of the fan-shaped slider to discharge the material. It cannot automatically screen and discharge the material during the grinding process, which affects the production efficiency. Therefore, the market urgently needs to develop a fine grinding device for calcium carbonate to help people solve the existing problems. Utility Model Content

[0005] The purpose of this invention is to provide a fine grinding device for calcium carbonate, in order to solve the problem mentioned in the background art that the grinding device for grinding calcium carbonate requires manual pulling of a fan-shaped slider for material discharge, and cannot automatically screen and discharge the material during the grinding process, thus affecting production efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fine grinding device for calcium carbonate, comprising a grinding tank, a grinding plate fixedly disposed at the lower middle part of the grinding tank, an annular screen fixedly connected between the outer side of the grinding plate and the inner wall of the grinding tank, a drive shaft rotatably connected to the upper middle part of the grinding plate, a connecting pipe sleeved on the outer side of the drive shaft and raised and lowered, C-shaped fixing frames fixedly connected to both sides of the connecting pipe, a fixing shaft fixedly connected to the middle part of the inner side of the C-shaped fixing frame, a grinding roller rotatably connected to the fixing shaft, a second arc-shaped scraper fixedly connected to both the front and rear ends of the connecting pipe and the upper part of the grinding plate, and a first arc-shaped scraper fixedly connected to the outer side of the C-shaped fixing frame and the upper part of the annular screen.

[0007] Preferably, a discharge port is provided at the lower middle part of the grinding tank, a limit tube is fixedly provided at the middle part of the grinding plate, a driving device is fixedly connected at the lower middle part of the grinding plate, and a driving motor is fixedly provided inside the driving device.

[0008] Preferably, the lower end of the drive shaft passes through the limiting tube and extends into the drive device, where it is connected to the output shaft of the drive motor via a coupling.

[0009] Preferably, rectangular keyways are provided on both end faces of the drive shaft, and rectangular keys are fixedly connected to both sides of the inner wall of the connecting tube. After the connecting tube is inserted into the outside of the drive shaft, the two rectangular keys slide into the two rectangular keyways respectively.

[0010] Preferably, a limiting plate is provided at the upper end of the drive shaft, and the limiting plate is fixedly connected to the upper end of the drive shaft by bolts.

[0011] Preferably, the two first arc-shaped scrapers are arranged in a circular array, and the two second arc-shaped scrapers are arranged in a circular array.

[0012] Preferably, the arching directions of the first arc-shaped scraper and the second arc-shaped scraper are opposite.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) In this utility model, the present utility model creatively adopts a collaborative working mechanism of an annular screen and a double arc scraper to realize the automated screening and material circulation in the grinding process. The special scraper design allows substandard materials to automatically return to the grinding area for further processing, while qualified products are discharged through the screen. The entire process does not require manual intervention, which greatly improves production efficiency.

[0015] (2) This utility model innovatively designs a double-arc scraper system with opposite arching directions. One set of scrapers is specifically responsible for recovering the material on the screen inward, while the other set is responsible for pushing the material outward. The two work together to form an efficient material circulation path. This design not only optimizes the flow trajectory of the material in the entire grinding chamber, but also completely eliminates the problem of material accumulation dead corners commonly found in traditional equipment, ensuring the uniformity and thoroughness of grinding, and making the particle size distribution of the final product more uniform.

[0016] (3) This utility model adopts a unique floating grinding mechanism design. Through the precise cooperation between the connecting pipe and the drive shaft, the grinding roller can automatically adjust its height according to the change in the amount of material, and always maintain the best grinding pressure. This intelligent adjustment mechanism not only avoids the common problem of idle running loss in traditional equipment, but also adapts to the processing needs of different batches of materials, significantly improving the adaptability and grinding efficiency of the equipment. Attached Figure Description

[0017] Figure 1 This is a front view of a calcium carbonate fine grinding device according to the present invention;

[0018] Figure 2 This is a front sectional view of the present invention;

[0019] Figure 3 This is a side sectional view of the present invention;

[0020] Figure 4 This is a detailed enlarged view of part A of this utility model.

[0021] In the diagram: 1. Grinding tank; 101. Discharge port; 102. Grinding plate; 103. Limiting tube; 104. Annular screen; 2. Drive device; 201. Drive motor; 3. Transmission shaft; 301. Rectangular keyway; 302. Limiting plate; 303. Bolt; 4. Connecting pipe; 401. Rectangular key; 402. C-shaped fixing frame; 403. Fixing shaft; 404. Grinding roller; 405. First arc-shaped scraper; 5. Second arc-shaped scraper. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figure 1-4This utility model provides an embodiment of a calcium carbonate fine grinding device, comprising a grinding tank 1, a grinding plate 102 fixedly disposed at the lower middle part of the grinding tank 1, an annular screen 104 fixedly connected between the outer side of the grinding plate 102 and the inner wall of the grinding tank 1, a drive shaft 3 rotatably connected to the upper middle part of the grinding plate 102, a connecting pipe 4 sleeved on the outer side of the drive shaft 3 and raised and lowered, C-shaped fixing frames 402 fixedly connected to both sides of the connecting pipe 4, a fixing shaft 403 fixedly connected to the middle part of the C-shaped fixing frame 402, a grinding roller 404 rotatably connected to the fixing shaft 403, second arc-shaped scrapers 5 fixedly connected to both ends of the connecting pipe 4 and the upper end of the grinding plate 102, first arc-shaped scrapers 405 fixedly connected to the outer side of the C-shaped fixing frame 402 and the upper end of the annular screen 104, the two first arc-shaped scrapers 405 arranged in a ring array, the two second arc-shaped scrapers 5 arranged in a ring array, the arching of the first arc-shaped scrapers 405 and the second arc-shaped scrapers 5 In the opposite direction, calcium carbonate raw material is fed into the grinding tank 1 from the top. The drive shaft 3 rotates, driving the connecting pipe 4 to rotate synchronously. This causes the connecting pipe 4 to simultaneously rotate the two C-shaped fixed frames 402 and their internal grinding rollers 404. When the grinding rollers 404 rotate, they grind the raw material on the grinding plate 102 by rotating the fixed shaft 403. When the connecting pipe 4 rotates, it simultaneously drives the two second arc-shaped scrapers 5 to rotate, scraping the raw material on the grinding plate 102 and pushing it outward to the top of the annular screen 104 through the arc structure. The top of the annular screen 104 then screens the raw material. Raw material that meets the particle size requirements falls through the annular screen 104. When the C-shaped fixed frames 402 rotate, they simultaneously drive the two first arc-shaped scrapers 405 to rotate. When the first arc-shaped scrapers 405 rotate, they scrape the raw material screened at the top of the annular screen 104 and push it back onto the grinding plate 102 through the arc structure of the first arc-shaped scrapers 405 for further grinding.

[0024] Please see Figure 2 The grinding tank 1 has a discharge port 101 at the lower middle. After the raw material is screened by the annular screen 104, it is discharged from the discharge port 101. The grinding plate 102 is fixedly provided with a limit tube 103 in the middle. The grinding plate 102 is fixedly connected to the lower middle. The driving device 2 is fixedly provided with a driving motor 201 inside the driving device 2. The lower end of the transmission shaft 3 passes through the limit tube 103 and extends into the driving device 2 and is connected to the output shaft of the driving motor 201 through a coupling. The driving motor 201 drives the transmission shaft 3 to rotate.

[0025] Please see Figure 2 and Figure 3Both ends of the drive shaft 3 are provided with rectangular keyways 301, and both sides of the inner wall of the connecting pipe 4 are fixedly connected with rectangular keys 401. After the connecting pipe 4 is fitted into the outside of the drive shaft 3, the two rectangular keys 401 slide into the two rectangular keyways 301 respectively, so that the drive shaft 3 rotates and drives the connecting pipe 4 to rotate. The upper end of the drive shaft 3 is provided with a limit plate 302, which is fixedly connected to the upper end of the drive shaft 3 by bolts 303. The limit plate 302 limits the upward range of the connecting pipe 4 to prevent the connecting pipe 4 from detaching from the drive shaft 3.

[0026] Working principle: In use, the calcium carbonate raw material to be processed is first fed into the device through the feed port at the top of the grinding tank 1. The raw material falls naturally onto the surface of the grinding plate 102. At this time, the drive motor 201 in the drive device 2 is started, and the motor drives the transmission shaft 3 to rotate at high speed through the coupling.

[0027] The rotational motion of the drive shaft 3 is transmitted to the connecting pipe 4 through the engagement of the rectangular keyways 301 on both sides of the shaft and the rectangular key 401 on the inner wall of the connecting pipe 4. The connecting pipe 4 drives the C-shaped fixing frames 402 on both sides to rotate synchronously, and the fixing shaft 403 inside the fixing frames drives the grinding roller 404 to move in a circular motion on the surface of the grinding plate 102. During the rotation, the grinding roller 404 uses its own gravity to crush the calcium carbonate raw material on the grinding plate 102, achieving preliminary crushing.

[0028] During the grinding process, the connecting pipe 4 simultaneously drives the second arc-shaped scraper 5 to rotate. Due to the special arc-shaped design of the second arc-shaped scraper 5, the material accumulated in the center of the grinding plate 102 can be continuously pushed to the periphery. Under the action of centrifugal force, the crushed material gradually moves towards the edge of the grinding plate 102 and finally reaches the area of ​​the annular screen 104.

[0029] The annular screen 104 performs the first screening of the material. Powder that meets the fineness requirements falls through the screen holes and is discharged and collected through the discharge port 101 at the bottom of the grinding tank 1. Coarse particles that do not meet the fineness requirements remain on the screen surface. At this time, the first arc-shaped scraper 405 (whose arching direction is opposite to that of the second arc-shaped scraper 5) which is fixedly connected to the C-shaped fixed frame 402 rotates with the fixed frame, scraping the coarse particles on the annular screen 104 back to the central area of ​​the grinding plate 102, forming a closed-loop circulation grinding process.

[0030] Throughout the entire operation, the grinding roller 404 can automatically adjust its height according to the material accumulation: when there is a lot of material, the grinding roller 404 floats upward under pressure; when the material decreases, it automatically descends under the action of gravity, ensuring that it always maintains the best contact pressure with the material. The limit plate 302 prevents the connecting pipe 4 from rising excessively and disengaging from the drive shaft 3.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A fine grinding apparatus for calcium carbonate, comprising a grinding jar (1), characterized in that: A grinding plate (102) is fixedly installed at the lower middle part of the grinding tank (1). An annular screen (104) is fixedly connected between the outer side of the grinding plate (102) and the inner wall of the grinding tank (1). A drive shaft (3) is rotatably connected to the middle of the upper end of the grinding plate (102). A connecting pipe (4) is sleeved on the outer side of the drive shaft (3) and raised and lowered. C-shaped fixing frames (402) are fixedly connected on both sides of the connecting pipe (4). A fixing shaft (403) is fixedly connected to the middle of the C-shaped fixing frame (402). A grinding roller (404) is rotatably connected on the fixing shaft (403). A second arc-shaped scraper (5) is fixedly connected to both the front and rear ends of the connecting pipe (4) and the upper end of the grinding plate (102). A first arc-shaped scraper (405) is fixedly connected to the outer side of the C-shaped fixing frame (402) and the upper end of the annular screen (104).

2. The calcium carbonate fine grinding device according to claim 1, characterized in that: The grinding tank (1) has a discharge port (101) at the middle of its lower end. The grinding plate (102) has a limit tube (103) fixedly installed in the middle. The grinding plate (102) has a drive device (2) fixedly connected to the middle of its lower end. The drive device (2) has a drive motor (201) fixedly installed inside.

3. The calcium carbonate fine grinding device according to claim 2, characterized in that: The lower end of the drive shaft (3) passes through the limiting tube (103) and extends into the drive device (2) and is connected to the output shaft of the drive motor (201) via a coupling.

4. The calcium carbonate fine grinding device according to claim 1, characterized in that: The drive shaft (3) has rectangular keyways (301) on both ends. The inner walls of the connecting pipe (4) are fixedly connected with rectangular keys (401). After the connecting pipe (4) is inserted into the outside of the drive shaft (3), the two rectangular keys (401) slide into the two rectangular keyways (301) respectively.

5. The calcium carbonate fine grinding device according to claim 1, characterized in that: The upper end of the drive shaft (3) is provided with a limiting plate (302), and the limiting plate (302) is fixedly connected to the upper end of the drive shaft (3) by bolts (303).

6. The calcium carbonate fine grinding device according to claim 1, characterized in that: The two first arc-shaped scrapers (405) are arranged in a ring array, and the two second arc-shaped scrapers (5) are arranged in a ring array.

7. The calcium carbonate fine grinding device according to claim 1, characterized in that: The arching directions of the first arc-shaped scraper (405) and the second arc-shaped scraper (5) are opposite.

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