Concrete mixing plant

Abstract

The invention relates to a concrete mixing plant which comprises a storage bin, a concrete mixing mechanism, a lithium slag screening mechanism and an aging pool. The lithium slag screening mechanism comprises a screening outer barrel and a screening inner barrel, screening holes are formed in the side wall and the bottom wall of the screening inner barrel, a first stirring mechanism is arranged in the screening inner barrel, and a discharging opening is formed in the bottom of the screening outer barrel; one end of the aging pool is a feeding end, the other end of the aging pool is a discharging end, an inclined conveying piece is arranged between the discharging opening and the aging pool, the lower end of the conveying piece is connected with the discharging opening, and the upper end of the conveying piece is located above the feeding end of the aging pool; a plurality of water filtering holes are formed in the material conveying piece, and a water receiving groove is formed below the material conveying piece; a scraping mechanism used for scraping the lithium slag from the feeding end to the discharging end is arranged in the aging tank, and the discharging end of the aging tank is connected with one storage bin through a second conveying mechanism. Lithium slag pretreatment equipment is integrated, an integrated production line capable of utilizing the lithium slag melting water is formed, and the production efficiency is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of concrete production technology, and in particular to a concrete mixing plant. Background Technology

[0002] Existing concrete mixing plants include aggregate bins for storing aggregates, powder bins for storing powders, mixing drums for mixing, and a water supply system. The aggregate bins and powder bins are connected to the mixing drum via conveyor belts or other conveying mechanisms. The water supply system uses pumps, pipes, and valves to pump water into the mixing drum.

[0003] With the development of lithium batteries, a large amount of lithium slag is generated during the production process. The treatment cost of this lithium slag is high, and the economic benefits are low. To treat lithium slag more economically and use it as a building material, it is currently commonly used in the preparation of concrete. Examples include a lithium slag recycled concrete disclosed in patent application CN202411225447.9, and an admixture for lithium slag concrete and its preparation method, as well as concrete, disclosed in patent application CN202510032573.0, etc.

[0004] Lithium slag is usually produced in the form of slag water. Before it can be used to prepare concrete, it needs to be filtered, dried and screened. Currently, these processes are carried out separately, and then the treated lithium slag is transferred to aggregate bins or powder bins. The whole process does not form a complete production line, which affects production efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a concrete mixing plant that integrates lithium slag pretreatment equipment to form an integrated production line that can utilize the slag water from lithium slag to ensure production efficiency.

[0006] To solve the above problems, the technical solution adopted by the present invention is: a concrete mixing plant, including multiple storage bins and a concrete mixing mechanism, wherein the storage bins are connected to the concrete mixing mechanism through a first transmission mechanism;

[0007] It also includes a lithium slag screening mechanism and an aging tank;

[0008] The lithium slag screening mechanism includes an outer screening cylinder and an inner screening cylinder disposed inside the outer screening cylinder. The inner screening cylinder has screen holes on its side walls and bottom walls. A first stirring mechanism is disposed inside the inner screening cylinder. A discharge port is disposed at the bottom of the outer screening cylinder.

[0009] The aging tank has a feeding end at one end and a discharging end at the other end. An inclined conveying device is provided between the discharge port and the aging tank. The lower end of the conveying device is connected to the discharge port, and the upper end of the conveying device is located above the feeding end of the aging tank. The conveying device is provided with multiple water filtering holes, and a water receiving trough is provided below the conveying device.

[0010] The aging tank is equipped with a scraping mechanism for scraping lithium slag from the feed end to the discharge end. The discharge end of the aging tank is connected to one of the storage bins through a second transmission mechanism.

[0011] Furthermore, the inner wall of the screening cylinder is provided with a notch extending vertically from its upper end to its lower end, and the side wall of the notch is provided with a vertical slot; a collection trough is provided in the notch, the horizontal cross-section of the collection trough is rectangular, and the opening side of the collection trough faces the inside of the screening cylinder, and the side wall and bottom wall of the collection trough are provided with screen holes; the outer wall of the collection trough is provided with a plug-in plate, and the plug-in plate is inserted into the slot.

[0012] Furthermore, the scraping mechanism includes a lifting frame, which is connected to a lifting mechanism. A vertical scraper is mounted on the lifting frame, and both ends of the scraper are fitted with the inner wall of the aging tank with a clearance. The scraper is also connected to a linear drive mechanism that drives the scraper to move back and forth in a linear motion.

[0013] Furthermore, both the first and second transmission mechanisms are spiral conveying pipes.

[0014] Furthermore, the concrete mixing mechanism includes a horizontally arranged mixing drum, the inner diameter of which decreases from the middle to both ends. A closable discharge gate is located at the bottom of the middle section of the mixing drum, and a feed hopper is located at the top of the middle section of the mixing drum. A mixing shaft and multiple mixing blades are arranged inside the mixing drum. The mixing shaft is connected to a mixing motor. One edge of each mixing blade is fixedly connected to the mixing shaft, and the other edge of each mixing blade slides against the inner wall of the mixing drum. A conveying plate perpendicular to the mixing blade is located on the side of each mixing blade near the mixing shaft. The mixing blade, the conveying plate, and the inner wall of the mixing drum form a conveying cavity. Vertical baffles are provided on the inner walls at both ends of the mixing drum. A first flow gap is provided between the baffles and the inner wall of the mixing drum end face, and a second flow gap is provided between the bottom of the baffles and the bottom wall of the mixing drum. When the mixing blades move to the bottom of the mixing drum, the baffles close part of the conveying cavity.

[0015] Furthermore, the conveying plate is an arc-shaped plate, and the middle part of the conveying plate protrudes towards the inside of the conveying cavity.

[0016] Furthermore, the upper part of the mixing drum is provided with a detachable installation and maintenance door.

[0017] Furthermore, the stirring blade is detachably connected to the stirring shaft via a connecting plate.

[0018] The beneficial effects of this invention are: This invention utilizes a lithium slag screening mechanism to filter and screen the lithium slag slag water, removing large particles of lithium slag, while small particles of lithium slag are fed into the aging tank via a conveying component.

[0019] Lithium slag obtained through processes such as limestone roasting typically contains unreacted f-CaO (free calcium oxide). After concrete hardens, this free calcium oxide slowly reacts with water to form Ca(OH)₂, causing significant volume expansion (f-CaO expands by approximately 98%). This delayed expansion generates substantial internal stress within the concrete, leading to cracking, loosening, and even disintegration, severely jeopardizing structural safety. Due to these defects, the proportion of lithium slag in the concrete is far lower than that of other materials, limiting its consumption. This invention addresses this issue by storing the screened lithium slag in an aging tank. After filtration through a conveyor, the lithium slag still has a high moisture content. The lithium slag undergoes natural aging and digestion in the aging tank for 3 to 5 weeks. During this process, the free calcium oxide in the lithium slag hydrates to form calcium hydroxide, which then reacts with carbon dioxide in the air to form stable calcium carbonate. This aging reaction eliminates most of the free calcium oxide in the lithium slag, allowing for a more appropriate increase in the amount of lithium slag used and faster consumption. Furthermore, the aging process is low-cost and requires no large capital investment.

[0020] This invention integrates lithium slag pretreatment equipment with a traditional concrete mixing plant, enabling automatic pretreatment and transportation of lithium slag and ensuring production efficiency. Attached Figure Description

[0021] Figure 1 This is an overall schematic diagram of the invention;

[0022] Figure 2 This is a cross-sectional schematic diagram of a lithium slag screening mechanism;

[0023] Figure 3 yes Figure 2 Schematic diagram of the AA section;

[0024] Figure 4 This is a schematic diagram of the aging pool;

[0025] Figure 5 This is a front sectional view of a concrete mixing plant;

[0026] Figure 6 yes Figure 5 Cross-sectional view of CC;

[0027] Figure 7 This is a schematic diagram showing the position of the stirring blades when the material is discharged from both ends of the conveying chamber;

[0028] Figure 8 This is a schematic diagram of the conveyor plate moving to a higher position;

[0029] Figure 9 yes Figure 8 Cross-sectional view of DD;

[0030] Reference numerals: 1—Storage bin; 11—Discharge port; 12—Pusher bar; 13—Pusher drive mechanism; 2—Concrete mixing mechanism; 21—Mixing drum; 22—Mixing shaft; 23—Mixing motor; 24—Mixing blades; 25—Conveying plate; 26—Discharge gate; 27—Baffle; 28—Second flow gap; 29—First flow gap; 210—Feed bin; 211—Installation and maintenance door; 212—Connecting plate; 3—First conveyor Structure; 4—Lithium slag screening mechanism; 41—Outer screening cylinder; 42—Inner screening cylinder; 43—First stirring mechanism; 44—Discharge port; 45—Conveying component; 46—Water receiving tank; 47—Collection trough; 48—Plug-in plate; 49—Collection chamber; 410—Positioning sleeve; 411—Positioning rod; 412—Spring; 5—Aging tank; 51—Lifting frame; 52—Lifting mechanism; 53—Scraper; 54—Linear drive mechanism; 6—Second transmission mechanism. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] The concrete mixing plant of the present invention, such as Figure 1 As shown, the system includes multiple storage bins 1 and a concrete mixing unit 2. The storage bins 1 are connected to the concrete mixing unit 2 via a first transmission mechanism 3. The storage bins 1 are used to store aggregates and powders for preparing concrete, with each bin 1 storing one type of aggregate or powder. The storage bins 1 can utilize existing structures. The concrete mixing unit 2 is used to mix the concrete raw materials to obtain concrete. The first transmission mechanism 3 is used to transport various raw materials to the concrete mixing unit 2. Other unused facilities, such as a water supply system, can be implemented using existing technologies.

[0033] The invention also includes a lithium slag screening mechanism 4 and an aging tank 5. The lithium slag screening mechanism 4 is used to screen the lithium slag slag-forming water to remove lithium slag particles with excessively large sizes. The lithium slag slag-forming water is provided by a lithium battery manufacturer. The aging tank 5 is used to age the lithium slag.

[0034] Specifically, the lithium slag screening mechanism 4, as shown in Figure 4 Figure 2 , Figure 3As shown, the system includes an outer screening cylinder 41 and an inner screening cylinder 42 disposed inside the outer screening cylinder 41. Both the outer screening cylinder 41 and the inner screening cylinder 42 are circular metal cylinders. The upper end of the inner screening cylinder 42 has a lithium slag inlet. The side walls and bottom walls of the inner screening cylinder 42 are provided with screen holes, which can screen out lithium slag particles with a particle size larger than the screen hole diameter. A first stirring mechanism 43 is provided inside the inner screening cylinder 42, and a discharge port 44 is provided at the bottom of the outer screening cylinder 41. The first stirring mechanism 43 is used to stir the lithium slag slag water, improving screening efficiency. The inner screening cylinder 42 can be suspended inside the outer screening cylinder 41. There is a gap between the side walls of the inner screening cylinder 42 and the side walls of the outer screening cylinder 41, and there is also a gap between the bottom walls of the inner screening cylinder 42 and the bottom walls of the outer screening cylinder 41. A mounting frame can be provided at the upper end of the inner screening cylinder 42, and the upper end of the first stirring mechanism 43 is mounted on the mounting frame. The first stirring mechanism 43 can adopt an existing conventional structure. The discharge port 44 is used to discharge the small lithium slag particles screened out. The lower end of the screening outer cylinder 41 can be set as a frustum shape. The diameter of the lower part of the screening outer cylinder 41 can decrease from top to bottom, so as to facilitate the rapid discharge of the screened lithium slag.

[0035] The screening process of the lithium slag screening mechanism 4 is as follows: Lithium slag slag solution is introduced into the inner screening cylinder 42, and the solution is stirred using the first stirring mechanism 43. Small lithium slag particles pass through the screen holes on the side and bottom walls of the inner screening cylinder 42 and enter the outer screening cylinder 41, then are discharged from the discharge port 44 at the bottom of the outer screening cylinder 41. Larger lithium slag particles remain in the inner screening cylinder 42, and the large particles are periodically cleaned. The large lithium slag particles can be crushed and reused.

[0036] Some lithium battery processes utilize limestone roasting, which produces lithium slag that typically contains unreacted f-CaO (free calcium oxide). After concrete hardens, this free calcium oxide slowly reacts with water to form Ca(OH)₂, causing significant volume expansion (f-CaO expands by approximately 98%). This delayed expansion generates substantial internal stress within the concrete, leading to cracking, crumbling, and even disintegration, severely compromising structural safety. Due to these defects, the proportion of lithium slag in concrete is far lower than that of other materials, resulting in limited lithium slag consumption.

[0037] The aging tank 5 is a rectangular tank with a large volume, which can be built on the ground, meaning that the upper end of the aging tank 5 is flush with the ground, thus reducing construction costs. One end of the aging tank 5 is the feed end, used to receive the screened lithium slag, and the other end is the discharge end, used to discharge the aged lithium slag.

[0038] An inclined conveying component 45 is provided between the discharge port 44 and the aging tank 5. The lower end of the conveying component 45 is connected to the discharge port 44, and the upper end of the conveying component 45 is located above the feed end of the aging tank 5. The conveying component 45 is provided with multiple water filtering holes, and a water receiving trough 46 is provided below the conveying component 45.

[0039] The lithium slag discharged from the discharge port 44 contains a large amount of solution, so it is filtered through the conveying component 45 to separate the solution from the lithium slag. The conveying component 45 can be a spiral conveyor pipe. During the conveying process, the liquid solution can fall downwards through the filter holes into the water receiving tank 46, while the solid lithium slag moves to the upper end of the conveying component 45 and falls into the feed end of the aging tank 5.

[0040] The aging tank 5 is equipped with a scraping mechanism to move lithium slag from the feed end to the discharge end. The discharge end of the aging tank 5 is connected to one of the storage bins 1 via a second transmission mechanism 6. The scraping mechanism can scrape the lithium slag in the aging tank 5, causing it to move towards the discharge end. After the lithium slag at the discharge end is transported to the storage bin 1 via the second transmission mechanism 6, the scraping mechanism can be used to scrape the lithium slag near the discharge end to the discharge end. This process is repeated until the lithium slag moves an appropriate distance towards the discharge end. After all the lithium slag has been scraped away, a certain cavity appears at the feed end, at which point new lithium slag can be added to the aging tank 5.

[0041] This invention involves storing the screened lithium slag in an aging tank 5, where the slag thickness is 40 to 80 cm. After filtration by the conveyor 45, the lithium slag still has a high moisture content. The lithium slag undergoes natural aging and digestion in the aging tank 5 for 3 to 5 weeks. During this process, the free calcium oxide in the lithium slag hydrates to form calcium hydroxide, which then reacts with carbon dioxide in the air to form stable calcium carbonate. This aging reaction eliminates most of the free calcium oxide in the lithium slag, allowing for a more appropriate increase in the amount of lithium slag used and faster consumption. The aging process is low-cost and requires no large capital investment.

[0042] To facilitate the discharge of large lithium slag particles from the screening inner cylinder 42, a notch is provided on the side wall of the screening inner cylinder 42, extending vertically from its upper end to its lower end. A vertical slot is provided on the side wall of the notch. A collection trough 47 is provided inside the notch. The horizontal cross-section of the collection trough 47 is rectangular, and the opening side of the collection trough 47 faces the inside of the screening inner cylinder 42. Screen holes are provided on both the side wall and the bottom wall of the collection trough 47. An insertion plate 48 is provided on the outer wall of the collection trough 47. The insertion plate 48 is inserted into the slot. The lower end of the collection trough 47 can be connected to the collection chamber 49. The collection chamber 49 is located below the bottom wall of the screening inner cylinder 42. Screen holes are also provided on the side wall and the bottom wall of the collection chamber 49.

[0043] like Figure 3As shown, the opening of the collection trough 47 faces the inside of the screening inner cylinder 42. When the first stirring mechanism 43 operates, it drives the lithium slag to rotate inside the screening inner cylinder 42. During the movement, small lithium slag particles are discharged through the screen holes on the side and bottom walls of the screening inner cylinder 42, while larger lithium slag particles remain inside the screening inner cylinder 42 and gradually enter the collection trough 47, then fall downwards into the collection chamber 49. Four positioning sleeves 410 can be provided on the outer wall of the screening inner cylinder 42, namely the first positioning sleeve, the second positioning sleeve, the third positioning sleeve, and the fourth positioning sleeve. The first and second positioning sleeves are coaxial, the third and fourth positioning sleeves are coaxial, and the first positioning sleeve is parallel to the third positioning sleeve. Four detachable positioning rods 411 are provided on the screening outer cylinder 41. Each positioning rod 411 extends into a positioning sleeve 410 and slides with the positioning sleeve 410. A spring 412 is provided between the positioning sleeve 410 and the screening outer cylinder 41.

[0044] With this installation method, the screening inner cylinder 42 can move back and forth in the axial direction of the positioning sleeve 410. When the lithium slag collides with the screening inner cylinder 42, the screening inner cylinder 42 generates reciprocating linear vibration, and the vibration direction is consistent with the axial direction of the positioning sleeve 410, thereby improving the screening efficiency. Since some small particles of lithium slag will also enter the collection trough 47 and the collection chamber 49, but the collection trough 47 and the collection chamber 49 are also provided with screen holes, when the screening inner cylinder 42 vibrates, it drives the lithium slag in the collection trough 47 and the collection chamber 49 to vibrate, causing the small particles of lithium slag in the collection trough 47 and the collection chamber 49 to be screened out.

[0045] After the lithium slag screening mechanism has been running for a period of time, each collection trough 47 can be removed, the lithium slag in the collection chamber 49 and the collection trough 47 can be emptied, and then it can be reinstalled for use. The collection trough 47 can be installed by plugging in the connecting plate 48 without any other connecting structure, which is convenient for disassembly and assembly. In addition, when the collection trough 47 is subjected to vibration, it can also vibrate up and down, which improves the screening effect of small lithium slag particles in the collection trough 47 and the collection chamber 49.

[0046] The scraping mechanism in this invention includes a lifting frame 51, such as... Figure 4 As shown, the lifting frame 51 is installed on the top of the aging tank 5. Specifically, multiple vertical guide columns can be installed on the top of the aging tank 5, with the guide columns passing through the lifting frame 51 and slidingly engaging with it. The lifting frame 51 is connected to a lifting mechanism 52, which can be a conventional device such as a hydraulic cylinder or pneumatic cylinder, used to push the lifting frame 51 up and down. A vertical scraper 53 is mounted on the lifting frame 51, located inside the aging tank 5. The two ends of the scraper 53 are in clearance fit with the inner wall of the aging tank 5. When the lifting frame 51 moves to its lowest point, the lower edge of the scraper 53 can reach the bottom wall of the aging tank 5. The two ends of the scraper 53 are in horizontal sliding fit with the lifting frame 51, and the scraper 53 is connected to a linear drive mechanism 54 that drives the scraper 53 to reciprocate linearly. The linear drive mechanism 54 can be a motor-driven screw mechanism.

[0047] When scraping the material, the scraper 53 is positioned above the lithium slag. First, the linear drive mechanism 54 moves the scraper 53 to a suitable position. Then, the lifting mechanism 52 moves the lifting frame 51 downwards, causing the scraper 53 to move downwards. The lower side of the scraper 53 enters the lithium slag and reaches the bottom wall of the aging tank 5. Next, the linear drive mechanism 54 moves the scraper 53 towards the discharge end of the aging tank, thus moving the lithium slag. The scraper 53 moves a suitable amount of lithium slag each time, and after multiple scraping motions, all the lithium slag can be moved an appropriate distance towards the discharge end.

[0048] In this invention, both the first transmission mechanism 3 and the second transmission mechanism 6 are spiral conveying pipes, which are the same as those in the prior art, or can be conveyor belts.

[0049] The concrete mixing unit 2 can be any existing vertical or horizontal mixing unit. To improve the mixing effect and ensure more uniform mixing of the components, such as... Figures 5 to 9 As shown, the concrete mixing mechanism 2 includes a horizontally arranged mixing drum 21. The inner diameter of the mixing drum 21 decreases from the middle to both ends, allowing the material at both ends of the mixing drum 21 to automatically move along the wall of the mixing drum 21 towards the middle. A closable discharge gate 26 is provided at the bottom of the middle section of the mixing drum 21 for discharging the finished concrete. A feed hopper 210 is provided at the top of the middle section of the mixing drum 21. The discharge port of the first transmission mechanism 3 is located above the feed hopper 210, allowing the material conveyed by the first transmission mechanism 3 to enter the mixing drum 21 through the feed hopper 210. A mixing shaft 22 and multiple mixing blades 24 are provided inside the mixing drum 21. The mixing shaft 22 is connected to a mixing motor 23, which can be a geared motor, capable of driving the mixing shaft 22 to rotate. One edge of each mixing blade 24 is fixedly connected to the mixing shaft 22. When the mixing shaft 22 rotates, it drives the mixing blades 24 to rotate, thereby mixing the material. The length direction of the stirring blade 24 is consistent with the length direction of the stirring shaft 22. The other edge of the stirring blade 24 slides against the inner wall of the mixing drum 21. When the stirring blade 24 rotates, it can scrape off fine materials such as cement that are adhering to the inner wall of the mixing drum 21. A conveying plate 25 is provided on the side of the stirring blade 24 near the stirring shaft 22. The stirring blade 24, the conveying plate 25, and the inner wall of the mixing drum 21 form a conveying cavity with open ends. Vertical baffles 27 are provided on the inner walls at both ends of the mixing drum 21. The baffles 27 are perpendicular to the length direction of the mixing drum 21. A first flow gap 29 is provided between the baffles 27 and the inner wall of the end face of the mixing drum 21. A second flow gap 28 is provided between the bottom of the baffles 27 and the bottom wall of the mixing drum 21. When the stirring blade 24 moves to the bottom of the mixing drum 21, the baffles 27 close part of the port of the conveying cavity.

[0050] During the rotation of the stirring blade 24, when the stirring blade 24 moves to the bottom of the stirring drum 21 and begins to rotate upward, the conveying chamber is filled with material. At this time, the baffle 27 closes the upper part of both ends of the conveying chamber. Figure 6 As shown, Figure 6 In the diagram, 's' represents the rotation direction of the stirring shaft 22 and the stirring blades 24. Figure 6 Taking the lowest and most densely packed agitator 24 as an example, the material in the conveying chamber will not flow out from either end. The agitator 24 continues to rotate upwards, causing the material in the conveying chamber to move upwards. When the conveying chamber moves to a point slightly above the upper edge of the agitator 24, such as... Figure 7 As shown, the material in the conveying chamber enters the first flow gap 29 from above the stirring blade 24, then falls along the first flow gap 29 to the bottom wall of the stirring drum 21, and then flows along the second flow gap 28 and the bottom wall of the stirring drum 21 towards the middle of the stirring drum 21. When the material in the middle of the stirring drum 21 enters the conveying chamber, it is also located in the middle of the conveying chamber. When the material at both ends of the stirring drum 21 enters the conveying chamber, it is also located at both ends of the conveying chamber. However, when the conveying chamber discharges, the material at both ends will be discharged first and then flow to the middle of the stirring drum 21, while the material in the middle of the conveying chamber will be discharged last and flow to both ends of the stirring drum 21, thereby ensuring sufficient movement of the material. In addition, the stirring blade 24 of this application can push the material to a higher position before falling, which is beneficial for the full dispersion and mixing of the material.

[0051] The conveyor plate 25 is an arc-shaped plate, and the middle part of the conveyor plate 25 bulges towards the inside of the conveying cavity. The arc-shaped conveyor plate 25 has a guiding function; when the conveyor plate 25 rotates to a higher position, such as... Figure 8 and Figure 9 As shown, the material slides along the conveyor plate 25, which can cause the material to slide along the raised surface of the conveyor plate 25 towards both ends.

[0052] To facilitate the installation and replacement of components such as the mixing blades 24, a detachable installation and maintenance door 211 is provided on the upper part of the mixing drum 21. The mixing blades 24 and the conveyor plate 25 can be welded together. After the installation and maintenance door 211 is opened, it is ensured that the mixing blades 24 and the conveyor plate 25 can be inserted into the mixing drum 21 as a whole. When assembling the concrete mixing mechanism 2, the mixing shaft 22 is first installed in place, then the installation and maintenance door 211 is opened to form an installation and maintenance port. The mixing blades 24 and the conveyor plate 25 are then inserted into the mixing drum 21 through the installation and maintenance port in sequence, and the mixing blades 24 are installed onto the mixing shaft 22. Each mixing blade 24 is installed in sequence.

[0053] The stirring blade 24 is detachably connected to the stirring shaft 22 via a connecting plate 212. The connecting plate 212 is an arc-shaped plate that can fit the stirring shaft 22. The connecting plate 212 can be connected to the stirring shaft 22 via screws.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A concrete mixing plant, comprising multiple storage bins (1) and a concrete mixing mechanism (2), wherein the storage bins (1) are connected to the concrete mixing mechanism (2) via a first transmission mechanism (3); characterized in that: It also includes a lithium slag screening mechanism (4) and an aging tank (5); The lithium slag screening mechanism (4) includes a screening outer cylinder (41) and a screening inner cylinder (42) disposed inside the screening outer cylinder (41). The screening inner cylinder (42) has screen holes on its side wall and bottom wall. A first stirring mechanism (43) is disposed inside the screening inner cylinder (42). A discharge port (44) is disposed at the bottom of the screening outer cylinder (41). The aging tank (5) has a feeding end at one end and a discharging end at the other end. An inclined conveying component (45) is provided between the discharge port (44) and the aging tank (5). The lower end of the conveying component (45) is connected to the discharge port (44), and the upper end of the conveying component (45) is located above the feeding end of the aging tank (5). The conveying component (45) is provided with multiple water filtering holes, and a water receiving trough (46) is provided below the conveying component (45). The aging tank (5) is equipped with a scraping mechanism for scraping lithium slag from the feed end to the discharge end. The discharge end of the aging tank (5) is connected to one of the storage bins (1) through a second transmission mechanism (6).

2. The concrete mixing plant as described in claim 1, characterized in that: The screening inner cylinder (42) has a notch extending vertically from its upper end to its lower end on its side wall. The side wall of the notch has a vertical slot. A collection trough (47) is provided inside the notch. The horizontal cross-section of the collection trough (47) is rectangular, and the opening side of the collection trough (47) faces the inside of the screening inner cylinder (42). The side wall and bottom wall of the collection trough (47) are provided with screen holes. The outer wall of the collection trough (47) is provided with a plug-in plate (48), which is plugged into the slot.

3. The concrete mixing plant as described in claim 1, characterized in that: The scraping mechanism includes a lifting frame (51), which is connected to a lifting mechanism (52). The lifting frame (51) has a vertical scraper (53) on it. The two ends of the scraper (53) are fitted with the inner wall of the aging tank (5) with a clearance. The scraper (53) is connected to a linear drive mechanism (54) that drives the scraper (53) to move back and forth in a linear manner.

4. The concrete mixing plant as described in claim 1, characterized in that: Both the first transmission mechanism (3) and the second transmission mechanism (6) are spiral conveying pipes.

5. The concrete mixing plant as described in claim 1, characterized in that: The concrete mixing mechanism (2) includes a horizontally arranged mixing drum (21), the inner diameter of which decreases from the middle to both ends. A closable discharge gate (26) is provided at the bottom of the middle part of the mixing drum (21), and a feed hopper (210) is provided at the top of the middle part of the mixing drum (21). A mixing shaft (22) and multiple mixing blades (24) are arranged inside the mixing drum (21). The mixing shaft (22) is connected to a mixing motor (23). One side edge of the mixing drum (21) is fixedly connected to the mixing shaft (22), and the other side edge of the mixing blades (24) is fixedly connected to the inner edge of the mixing blades (24). The mixing blade (24) is slidingly fitted with a conveying plate (25) on one side near the mixing shaft (22). The mixing blade (24), the conveying plate (25), and the inner wall of the mixing cylinder (21) form a conveying cavity. Vertical baffles (27) are provided on the inner walls at both ends of the mixing cylinder (21). A first flow gap (29) is provided between the baffle (27) and the inner wall of the end face of the mixing cylinder (21). A second flow gap (28) is provided between the bottom of the baffle (27) and the bottom wall of the mixing cylinder (21). When the mixing blade (24) moves to the bottom of the mixing cylinder (21), the baffle (27) closes part of the port of the conveying cavity.

6. The concrete mixing plant as described in claim 5, characterized in that: The conveying plate (25) is an arc-shaped plate, and the middle part of the conveying plate (25) protrudes towards the inside of the conveying cavity.

7. The concrete mixing plant as described in claim 5, characterized in that: The upper part of the mixing drum (21) is provided with a detachable installation and maintenance door (211).

8. The concrete mixing plant as described in claim 5, characterized in that: The stirring blade (24) is detachably connected to the stirring shaft (22) via a connecting plate (212).

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