Screening mechanism for lithium carbonate grinding

Abstract

The utility model relates to the technical field of lithium carbonate production equipment, and provides a screening mechanism for grinding lithium carbonate, which is arranged in the middle in a shell of a grinding device and is positioned right below a grinding mechanism, and comprises a scraper blade for scraping and sweeping a screening plate positioned below the scraper blade; the sieve plate is connected with the shell and is used for sieving coarse-particle-size lithium carbonate and fine-particle-size lithium carbonate which are generated after the lithium carbonate is ground by the grinding mechanism; wherein the scraping plate is connected with the grinding mechanism so as to coaxially rotate with the grinding mechanism. The screening mechanism composed of the scraping plate and the screening plate is additionally arranged under the grinding mechanism, and the scraping plate and the grinding mechanism rotate coaxially, so that coarse and fine particle size screening can be carried out in time in the shell after lithium carbonate is ground, the structure is compact, the investment is low, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium carbonate production equipment, in particular to a screening mechanism for grinding lithium carbonate. Background Art

[0002] Lithium carbonate is an inorganic compound with the chemical formula Li2CO3 and a molecular weight of 73.89. It occurs as colorless monoclinic crystals and is slightly soluble in water and dilute acid, but insoluble in ethanol and acetone. Lithium carbonate has a wide range of applications, including as a raw material for the manufacture of ceramics, pharmaceuticals, catalysts, and lithium batteries.

[0003] The main raw material for producing lithium carbonate is salt lake brine. During the production process of lithium carbonate, the lithium carbonate must be ground to turn the crystalline lithium carbonate into powder for easy use.

[0004] At present, the existing grinding device can only grind lithium carbonate, and cannot timely screen out lithium carbonate with particle size that meets the requirements from the ground lithium carbonate. That is, the existing grinding device does not have a screening function, and a separate screening device needs to be configured to screen the ground lithium carbonate. This will not only increase the investment and operation and maintenance costs of production equipment, but also reduce work efficiency. Utility Model Content

[0005] In response to the shortcomings of the existing technology, the utility model provides a screening mechanism for lithium carbonate grinding to solve the problem that the grinding device in the existing technology can only grind lithium carbonate, but cannot timely screen out lithium carbonate with a particle size that meets the requirements from the ground lithium carbonate. That is, the existing grinding device does not have a screening function, and a separate screening device needs to be configured to screen the ground lithium carbonate, which not only increases the investment and operation and maintenance costs of the production equipment, but also reduces work efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A screening mechanism for lithium carbonate grinding is provided in the middle of a housing of a grinding device and directly below the grinding mechanism, the screening mechanism comprising:

[0008] A scraper for scraping the screen plate below it; and

[0009] a sieve plate connected to the housing and used for screening the coarse-grained lithium carbonate and the fine-grained lithium carbonate produced after the lithium carbonate is ground by the grinding mechanism;

[0010] Wherein, the scraper is connected to the grinding mechanism so as to rotate coaxially therewith.

[0011] Optionally, the shell includes a feed hopper, a first straight cylinder section, a conical cylinder section, a second straight cylinder section and a discharge hopper which are sequentially arranged in the upper and lower parts;

[0012] The grinding mechanism includes a motor and a grinding cone. The motor is fixedly mounted in the middle of the top cover of the feed hopper. The grinding cone is fixedly connected to the motor output shaft extending into the feed hopper via a transmission shaft passing through the middle thereof. A grinding channel is provided between the grinding cone and the feed hopper.

[0013] The scraper is located inside the conical cylinder section and is detachably connected to the end of the transmission shaft away from the motor so as to rotate coaxially therewith;

[0014] The sieve plate is elastically connected to the inner side wall of the second straight cylinder section, and the edge of the sieve plate is 1 to 2 mm higher than the pipe opening opened on the side wall of the second straight cylinder section.

[0015] Optionally, the scraper includes a core shaft and a scraper blade connected to each other;

[0016] The core shaft is threadedly connected to an end of the transmission shaft away from the motor;

[0017] There are multiple scrapers evenly distributed around the circumference of the core shaft.

[0018] Optionally, a plurality of hard bristles are provided on the side of each scraper that contacts the sieve plate, for cleaning the sieve plate to unclog the sieve holes of the sieve plate.

[0019] Optionally, the sieve holes of the sieve plate are divided into two parts: a column hole section and a cone hole section;

[0020] The inlet of the cylindrical hole section is close to the scraper, and the outlet of the tapered hole section has a larger aperture and is far away from the scraper.

[0021] Optionally, three scrapers are evenly distributed around the circumference of the core shaft.

[0022] Optionally, the longitudinal section of the sieve plate is a herringbone structure with a high middle and low sides.

[0023] Optionally, the cone apex angle of the sieve plate is 160°.

[0024] Optionally, a plurality of springs evenly distributed around the circumference are connected to the lower side of the edge of the sieve plate;

[0025] One end of each spring away from the screen plate is connected to a support block provided on the inner side wall of the second straight cylinder section.

[0026] Optionally, four springs are evenly distributed around the circumference.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The screening mechanism is constituted by adding the scraper and the screen plate below the grinding mechanism, and the scraper rotates coaxially with the grinding mechanism, so that the coarse and fine particle size screening can be carried out in the shell in time after the lithium carbonate is ground, the structure is compact, the investment is less, and the working efficiency is greatly improved.

[0029] 2. The multiple scraping blades are driven by the transmission shaft to cyclically scrape the screen plate, so that the screen plate is periodically vibrated to sufficiently screen the coarse particle size lithium carbonate and the fine particle size lithium carbonate falling on the screen plate.

[0030] 3. The screen plate edge with the herringbone structure is similar to a slope, which can avoid the accumulation of the ground lithium carbonate and is beneficial to the discharge of the coarse particle size lithium carbonate.

[0031] 4. When the scraper scrapes the screen plate, the spring is compressed and deformed, so that the screen plate can be always closely attached to the scraper through the compression and reset of the spring, so as to realize automatic compensation, ensure the scraping effect of the scraper and the periodic vibration of the screen plate, and further improve the screening efficiency of the coarse particle size lithium carbonate and the fine particle size lithium carbonate. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Figure 1 The structure schematic view of the present application applied in the grinding device;

[0034] Figure 2 The Figure 1 The structure schematic view of the local part A;

[0035] Figure 3 The screen hole structure schematic view of the screen plate. DETAILED DESCRIPTION

[0036] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and description are considered to be exemplary in nature rather than limiting.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0039] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0042] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0043] See also Figures 1 to 3 As shown, the present invention provides a screening mechanism 300 for lithium carbonate grinding, which is arranged in the middle of the housing 100 of the grinding device and directly below the grinding mechanism 200. The screening mechanism 300 includes:

[0044] A scraper 310 for scraping the screen plate 320 located therebelow; and

[0045] The sieve plate 320 is connected to the housing 100 and is used to separate the coarse-grained lithium carbonate and the fine-grained lithium carbonate produced by the grinding mechanism 200;

[0046] The scraper 310 is connected to the grinding mechanism 200 to rotate coaxially therewith.

[0047] Specifically, the shell 100 includes a feed hopper 110, a first straight cylinder section 120, a conical cylinder section 130, a second straight cylinder section 140 and a discharge hopper 150, which are arranged in sequence from top to bottom; the grinding mechanism 200 includes a motor 210 and a grinding cone 220, the motor 210 is fixedly installed in the middle of the top cover 111 of the feed hopper 110, and the grinding cone 220 is fixedly connected to the output shaft of the motor 210 extending to the inside of the feed hopper 110 through a transmission shaft 230 passing through the middle thereof, and a grinding channel is provided between the grinding cone 220 and the feed hopper 110; the scraper 310 is located inside the conical cylinder section 130, and is detachably connected to the end (i.e., the lower end) of the transmission shaft 230 away from the motor 210 so as to rotate coaxially therewith; the sieve plate 320 is elastically connected to the inner wall of the second straight cylinder section 140, and the edge of the sieve plate 320 is 1 to 2 mm higher than the pipe mouth opened on the side wall of the second straight cylinder section 140.

[0048] During operation, the motor 210 is started, and the grinding cone 220 is rotated by the transmission shaft 230, and the lithium carbonate to be ground is poured into the feed hopper 110 from the feeding port 112 on the top cover 111 of the feed hopper 110. As the grinding cone 220 rotates, the lithium carbonate enters the grinding channel and is ground into coarse-grained lithium carbonate and fine-grained lithium carbonate. After exiting the grinding channel, the lithium carbonate passes through the first straight section 120 and falls onto the sieve plate 320 of the screening mechanism 300; the sieve plate 320 is scraped to produce lithium carbonate. Vibration is generated, thereby screening the coarse-grained lithium carbonate and fine-grained lithium carbonate falling on the screen plate 320. The fine-grained lithium carbonate that meets the requirements falls into the discharge hopper 150 through the screen plate 320 and is discharged through the discharge port 151 at the bottom. The coarse-grained lithium carbonate that does not meet the requirements remains on the screen plate 320. At the same time, due to the scraping of the scraper 310, the coarse-grained lithium carbonate generates centrifugal force and is thrown outward, and finally discharged through the pipe opening opened on the side wall of the second straight cylinder section 140, thereby achieving screening. That is to say, by adding a screening mechanism 300 consisting of a scraper 310 and a screen plate 320 directly below the grinding mechanism 200, and the scraper 310 rotates coaxially with the grinding mechanism 200, the coarse and fine particle sizes can be screened in time in the shell 100 after the lithium carbonate is ground. The structure is compact and the investment is small, which greatly improves the work efficiency.

[0049] The scraper 310 comprises a core shaft 311 and scraping blades 312, which are connected to each other. The core shaft 311 is threadedly connected to the end (i.e., the lower end) of the drive shaft 230 away from the motor 210. Multiple scraping blades 312 are evenly distributed around the circumference of the core shaft 311. Driven by the drive shaft 230, the multiple scraping blades 312 cyclically scrape the screen plate 320, causing the screen plate 320 to vibrate periodically, effectively separating the coarse and fine lithium carbonate particles that fall on the screen plate 320.

[0050] In order to prevent the mesh of the sieve plate 320 from being blocked by lithium carbonate and to ensure the screening performance of the sieve plate 320, a plurality of hard bristles are provided on the side of each scraper 312 that contacts the sieve plate 320, which are used to clean the sieve plate 320 to clear the mesh 321 of the sieve plate 320. At the same time, the mesh 321 of the sieve plate 320 is divided into two parts, the column hole section and the cone hole section (see Figure 3 As shown in FIG, the cylindrical hole section entrance is close to the scraper 312, and the conical hole section exit has a larger aperture and is further away from the scraper 312. This sieve hole 321 with a larger upper portion and a smaller lower portion is less prone to clogging and can improve the passing rate of fine-particle lithium carbonate.

[0051] In this embodiment, three scrapers 312 are evenly distributed around the circumference of the core shaft 311 .

[0052] See also Figure 2As shown, the longitudinal cross-section of the sieve plate 320 has a herringbone structure, with a high center and low sides. This herringbone-shaped structure creates slopes along the edges of the sieve plate 320, preventing accumulation of ground lithium carbonate and facilitating the removal of coarse-grained lithium carbonate. Specifically, the apex angle of the sieve plate 320 is 160°, meaning that the angle (i.e., the slope) between the two sides of the longitudinal cross-section and the horizontal plane is 10°.

[0053] Connected to the underside of the edge of the sieve plate 320 are multiple springs 330 evenly distributed around the circumference. The end of each spring 330, facing away from the sieve plate 320, is connected to a support block 141 provided on the inner sidewall of the second straight cylindrical section 140. As a result, when the scraper 310 scrapes the sieve plate 320, the springs 330 are compressed and deformed, allowing the sieve plate 320 to always fit tightly against the scraper 310 through the compression and reset of the springs 330. This achieves automatic compensation, ensuring the scraping effect of the scraper 310 and the continuous periodic vibration of the sieve plate 320, thereby improving the screening efficiency of coarse and fine lithium carbonate.

[0054] In this embodiment, four springs 330 are evenly distributed around the circumference.

[0055] The above embodiments are only preferred embodiments of the present invention and are not limitations on the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A screening mechanism for lithium carbonate grinding, arranged in the middle of the housing of a grinding device and directly below the grinding mechanism, characterized in that: The screening mechanism includes: A scraper for scraping the screen plate below it; and a sieve plate connected to the housing and used for screening the coarse-grained lithium carbonate and the fine-grained lithium carbonate produced after the lithium carbonate is ground by the grinding mechanism; wherein the scraper is connected to the grinding mechanism so as to rotate coaxially therewith; The shell includes a feed hopper, a first straight cylinder section, a conical cylinder section, a second straight cylinder section and a discharge hopper which are arranged in sequence up and down; The grinding mechanism includes a motor and a grinding cone. The motor is fixedly mounted in the middle of the top cover of the feed hopper. The grinding cone is fixedly connected to the motor output shaft extending into the feed hopper via a transmission shaft passing through the middle thereof. A grinding channel is provided between the grinding cone and the feed hopper. The scraper is located inside the conical cylinder section and is detachably connected to the end of the transmission shaft away from the motor so as to rotate coaxially therewith; The sieve plate is elastically connected to the inner side wall of the second straight cylinder section, and the edge of the sieve plate is 1 to 2 mm higher than the pipe opening opened on the side wall of the second straight cylinder section.

2. The lithium carbonate grinding screening mechanism according to claim 1, characterized in that: The scraper includes a core shaft and a scraper blade connected to each other; The core shaft is threadedly connected to an end of the transmission shaft away from the motor; There are multiple scrapers evenly distributed around the circumference of the core shaft.

3. The lithium carbonate grinding screening mechanism according to claim 2, wherein A plurality of hard bristles are provided on the side of each scraper that contacts the sieve plate, which are used for cleaning the sieve plate to unclog the sieve holes of the sieve plate.

4. The lithium carbonate grinding screening mechanism according to claim 3, characterized in that: The sieve holes of the sieve plate are divided into two parts: a column hole section and a cone hole section; The inlet of the cylindrical hole section is close to the scraper, and the outlet of the tapered hole section has a larger aperture and is far away from the scraper.

5. The lithium carbonate grinding screening mechanism according to any one of claims 2 to 4, characterized in that: There are three scrapers evenly distributed around the circumference of the core shaft.

6. The lithium carbonate grinding screening mechanism according to any one of claims 1 to 4, characterized in that: The longitudinal section of the sieve plate is a herringbone structure with a high middle and low sides.

7. The lithium carbonate grinding screening mechanism according to claim 6, characterized in that: The cone apex angle of the sieve plate is 160°.

8. The lithium carbonate grinding screening mechanism according to claim 1 or 7, characterized in that: The lower side of the edge of the sieve plate is connected to a plurality of springs evenly distributed around the circumference; One end of each spring away from the screen plate is connected to a support block provided on the inner side wall of the second straight cylinder section.

9. The lithium carbonate grinding screening mechanism according to claim 8, characterized in that: There are four springs evenly distributed around the circumference.

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