Vertical mill external grading grinding system for high-fine-powder-content powdery raw materials

Abstract

The utility model relates to the technical field of raw material grinding, and particularly discloses a high-fine-powder-content powdery raw material vertical mill external grading grinding system which comprises a transfer hopper, the discharging end of the transfer hopper is connected with a vertical mill assembly, the discharging end of the vertical mill assembly is connected with a lifting assembly, the discharging end of the lifting assembly is connected with a grading assembly, and the discharging end of the grading assembly is connected with a vertical mill assembly. The grading assembly is located at the feeding end of the transfer hopper, a discharging pipe is fixed to the discharging end of the grading assembly, and an induced draft fan is fixed to the middle of the discharging pipe; the grading assembly comprises a grading tank, a dispersing disc is rotatably mounted in the grading tank, the bottom of the dispersing disc is fixedly connected with a lead screw, the lead screw is sleeved with a lifting sliding plate, a scraping disc is fixed to the outer portion of the lifting sliding plate, and a rotating rod is fixed to the bottom of the lead screw; and a scraping plate attached to the bottom of the grading tank is fixed to one side of the rotating rod. The scraping plate and the scraping plate move under the action of the lead screw and the rotating rod respectively, so that powder adhered to the inner wall of the grading tank can be scraped off conveniently, and the powder can be collected conveniently.

Description

Technical Field

[0001] This utility model relates to the field of raw material grinding technology, and in particular to a vertical mill external classification grinding system for fine powder raw materials with high content of fine powder. Background Technology

[0002] Fine powder high-content powdered raw materials refer to powdered materials containing a large amount of fine powder components. These raw materials are ground into powdered materials to meet the required specifications using a vertical mill. The core working components of a vertical mill are the grinding disc and grinding rollers. An electric motor drives the grinding disc to rotate via a reducer, and the grinding rollers roll around their own axes on the grinding disc. Material enters the mill, reaches the grinding disc, and is pulverized and ground through the interaction of the grinding rollers and the grinding disc.

[0003] Current vertical mills use a circulating feeding method for multiple grinding processes, which results in the repeated grinding of qualified powder, leading to low efficiency and increased energy consumption.

[0004] A publicly available technical solution, CN213050876U, discloses a vertical mill external classification grinding system for fine, high-content powdered raw materials. This system includes a vertical mill main unit and an external classification unit. The external classification unit comprises a classifier, a disperser, a hopper, and a volute-type air inlet connected together. The volute-type air inlet has an air inlet pipe connected to the atmosphere, and its outlet is connected to a guide pipe via a storage hopper. The feeding unit includes a raw material silo and an elevator. The raw material silo is connected to the elevator's inlet via a conveying weighing scale, and the elevator's outlet is connected to the classifier via a feeding screw conveyor. The main unit's outlet is connected to the elevator's inlet. The dust collection and induced draft unit includes a pulse dust collector and an induced draft fan connected together, with the pulse dust collector connected to the classifier. By incorporating a classifier, the powder can be classified, reducing over-grinding of fine powders, increasing production capacity, and reducing energy consumption.

[0005] In actual implementation, the above technical solution classifies materials using a classifier. However, materials may adhere to the inner wall of the classifier, preventing the classified powder from fully entering the hopper. Summary of the Invention

[0006] The purpose of this invention is to provide a vertical mill external grading and grinding system for fine powder raw materials with high content of powder. The system uses a scraper disc and a scraper plate that move under the action of a lead screw and a rotating rod, respectively, to easily scrape off the powder adhering to the inner wall of the grading tank and facilitate powder collection, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a vertical mill external grading grinding system for fine powder high-content powdered raw materials, including a rotating hopper, the discharge end of the rotating hopper is connected to a vertical mill assembly, the discharge end of the vertical mill assembly is connected to a lifting assembly, the discharge end of the lifting assembly is connected to a grading assembly, the grading assembly is located at the feed end of the rotating hopper, the discharge end of the grading assembly is fixed with a discharge pipe, and an induced draft fan is fixed in the middle of the discharge pipe;

[0008] The grading assembly includes a grading tank, inside which a dispersing disc is rotatably mounted, and a lead screw is fixedly connected to the bottom of the dispersing disc. A lifting slide plate is sleeved on the outside of the lead screw, and a scraper is fixed on the outside of the lifting slide plate. A rotating rod is fixed to the bottom of the lead screw, and a scraper that fits against the bottom of the grading tank is fixed on one side of the rotating rod.

[0009] Preferably, guide rods are provided on both the left and right sides of the lead screw, and the guide rods pass through the interior of the lifting slide plate. A support frame is fixed at the bottom of the guide rod, and the support frame is fixed inside the grading tank.

[0010] Preferably, a guide pipe is provided above the dispersing disc and extends through the interior of the classifying tank. The end of the guide pipe is fixedly connected to the discharge end of the lifting assembly, and the axis of the guide pipe coincides with that of the dispersing disc.

[0011] Preferably, an air supply pipe is fixedly connected to one side of the grading tank, and the air supply pipe runs obliquely upward through the interior of the grading tank.

[0012] Preferably, the lifting assembly includes a lifting machine housing, a spiral auger is rotatably mounted inside the lifting machine housing, and a heating chamber is provided outside the lifting machine housing, with an insulation shell provided outside the heating chamber.

[0013] Preferably, the front end of the elevator housing is provided with a feed inlet, and an electric heating wire is fixed to the inner wall of the heating chamber.

[0014] Preferably, the vertical mill assembly includes a vertical mill housing, a grinding disc is rotatably mounted inside the vertical mill housing, and a grinding roller is rotatably connected above the grinding disc. A feed pipe penetrating inside the vertical mill housing is fixed to the bottom of the intermediate hopper.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The scraper disc and scraper move under the action of the lead screw and rotating rod respectively, which facilitates the scraping of powder adhering to the inner wall of the classifier and makes it easy to collect the powder;

[0017] 2. The lifting components can heat the powder through the heating chamber to remove excess moisture from the material. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is an overall structural view of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the hierarchical component of this utility model;

[0021] Figure 3 For the present utility model Figure 2 Enlarged view of A in the middle;

[0022] Figure 4 This is a schematic diagram of the structure of the vertical mill assembly of this utility model;

[0023] Figure 5 This is a schematic diagram of the lifting component of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Transfer bucket; 2. Vertical mill assembly; 201. Vertical mill shell; 202. Feed pipe; 203. Grinding disc; 204. Grinding roller; 3. Grading assembly; 301. Grading tank; 302. Dispersing disc; 303. Scraper disc; 304. Rotating rod; 305. Support frame; 306. Scraper; 307. Lead screw; 308. Guide rod; 309. Lifting slide plate; 4. Lifting assembly; 401. Elevator shell; 402. Heating chamber; 403. Insulation shell; 404. Spiral auger; 405. Electric heating wire; 5. Guide pipe; 6. Air supply pipe; 7. Discharge pipe; 8. Exhaust fan. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] This utility model provides a technical solution:

[0028] Please see Figures 1 to 3A vertical mill external grading and grinding system for fine powder high content powder raw materials includes a central rotating hopper 1, a vertical mill assembly 2 connected to the discharge end of the central rotating hopper 1, a lifting assembly 4 connected to the discharge end of the vertical mill assembly 2, a grading assembly 3 connected to the discharge end of the lifting assembly 4, the grading assembly 3 being located at the feed end of the central rotating hopper 1, a discharge pipe 7 fixed to the discharge end of the grading assembly 3, and an induced draft fan 8 fixed in the middle of the discharge pipe 7.

[0029] The grading assembly 3 includes a grading tank 301, a dispersing disc 302 is rotatably mounted inside the grading tank 301, a lead screw 307 is fixedly connected to the bottom of the dispersing disc 302, a lifting slide plate 309 is sleeved on the outside of the lead screw 307, a scraper disc 303 is fixed on the outside of the lifting slide plate 309, a rotating rod 304 is fixed to the bottom of the lead screw 307, and a scraper 306 that fits against the bottom of the grading tank 301 is fixed on one side of the rotating rod 304.

[0030] Guide rods 308 are provided on both the left and right sides of the lead screw 307, and the guide rods 308 pass through the interior of the lifting slide plate 309. A support frame 305 is fixed at the bottom of the guide rods 308 and is fixed inside the classifying tank 301. A guide pipe 5 is provided above the dispersing disc 302 and passes through the interior of the classifying tank 301. The end of the guide pipe 5 is fixedly connected to the discharge end of the lifting component 4, and the axis of the guide pipe 5 coincides with that of the dispersing disc 302. The dispersing disc 302 is driven by a motor through a bevel gear structure. A set of bevel gears is fixedly connected to the power output end of the motor. The direction of power transmission is changed through the bevel gear set. The output end of the bevel gear set is fixedly connected to the dispersing disc 302, thereby driving the dispersing disc 302 to rotate. An air supply pipe 6 is fixedly connected to one side of the classifying tank 301 and passes through the interior of the classifying tank 301 at an angle upward. This allows the air supply pipe 6 to send air into the interior of the classifying tank 301 and blow the dispersed powder upward.

[0031] By adopting the above technical solution, when the dispersing disc 302 rotates, it can drive the lead screw 307 to rotate simultaneously. Under the action of the lead sleeve, the lead screw 307 can drive the lifting slide plate 309 to move. The lifting slide plate 309 can only slide along the guide rod 308, which can drive the scraper disc 303 to move up and down under the action of the lead screw 307. The outer side of the scraper disc 303 is in contact with the inner wall of the classifying tank 301, which can scrape off the powder adhering to the inner wall of the classifying tank 301. At the same time, the lead screw 307 can drive the scraper 306 to rotate under the action of the rotating rod 304. The scraper 306 is located on the inner side of the conical bottom of the classifying tank 301, and is in contact with the scraper. The disc 303 works in conjunction with the powder to scrape it off, allowing the powder to fall completely into the transfer hopper 1. When classifying the powder, the powder enters the classifying tank 301 through the guide pipe 5 and is dispersed by the rotating dispersing disc 302. The blower 8 and the air supply pipe 6 work together to discharge the air in the classifying tank 301 from bottom to top. The fine powder is discharged into the dust collector through the discharge pipe 7, while the coarse powder moves downward under the action of gravity. The scraper disc 303 and the scraper 306 move under the action of the lead screw 307 and the rotating rod 304, respectively, to easily scrape off the powder adhering to the inner wall of the classifying tank 301 and facilitate the collection of the powder.

[0032] Specifically, such as Figure 4 and Figure 5 As shown, the lifting assembly 4 includes a lifting housing 401, a spiral auger 404 is rotatably installed inside the lifting housing 401, and a heating chamber 402 is provided outside the lifting housing 401. An insulation shell 403 is provided outside the heating chamber 402. Several electric heating wires 405 are fixed inside the heating chamber 402. The electric heating wires 405 are spirally wound inside the heating chamber 402 to heat the heating chamber 402. A feed inlet is also provided at the front end of the lifting housing 401. The vertical mill assembly 2 includes a vertical mill housing 201, a grinding disc 203 is rotatably installed inside the vertical mill housing 201, and a grinding roller 204 is rotatably connected above the grinding disc 203. A feed pipe 202 that penetrates the interior of the vertical mill housing 201 is fixed at the bottom of the intermediate transfer bucket 1.

[0033] By adopting the above technical solution, the powder inside the vertical mill housing 201 is ground under the action of the grinding disc 203 and the grinding roller 204. The structure of the grinding disc 203 and the grinding roller 204 is completely consistent with the existing vertical mill structure, and will not be described in detail here. The ground powder is conveyed to the classifying component 3 for classification through the lifting component 4. When the lifting component 4 is in use, the powder enters the lifting housing 401 through the feed port. For powder with high moisture content, it can be heated through the heating chamber 402 to avoid the powder with high moisture content from easily adhering to the inside of the powder device. The powder is conveyed from bottom to top to the inside of the guide pipe 5 through the rotating auger 404, and then put into the classifying tank 301 through the guide pipe 5.

[0034] Working principle: Powder enters the elevator housing 401 through the feed inlet. For powder with high moisture content, it can be heated through the heating chamber 402 to prevent the powder from easily adhering to the inside of the powder device. The powder is conveyed from bottom to top to the inside of the guide pipe 5 by the rotating auger 404, and then fed into the classifying tank 301 through the guide pipe 5. It is then dispersed by the rotating dispersing disc 302. The induced draft fan 8 and the air supply pipe 6 work together to discharge the air in the classifying tank 301 from bottom to top. Fine powder is discharged into the dust collector through the discharge pipe 7, while coarse powder moves downward under the action of gravity. When the dispersing disc 302 rotates, it can drive the lead screw 307 to rotate simultaneously. Under the action of the lead sleeve, the lead screw 307... The lifting slide plate 309 can move, and the lifting slide plate 309 can only slide along the direction of the guide rod 308. Under the action of the lead screw 307, the scraper disc 303 can move up and down. The outer side of the scraper disc 303 is in contact with the inner wall of the classifying tank 301, so that the powder adhering to the inner wall of the classifying tank 301 can be scraped off. At the same time, the lead screw 307 can drive the scraper 306 to rotate under the action of the rotating rod 304. The scraper 306 is located on the inner side of the conical bottom of the classifying tank 301 and cooperates with the scraper disc 303 to scrape off the powder, so that the powder can fall completely into the interior of the intermediate hopper 1. The powder in the intermediate hopper 1 enters the vertical mill housing 201 and is ground under the action of the grinding disc 203 and the grinding roller 204.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A vertical mill external classification grinding system for fine powder high-content powdered raw materials, comprising a central rotating bucket (1), characterized in that: The discharge end of the transfer bucket (1) is connected to a vertical mill assembly (2), and the discharge end of the vertical mill assembly (2) is connected to a lifting assembly (4). The discharge end of the lifting assembly (4) is connected to a grading assembly (3), and the grading assembly (3) is located at the feed end of the transfer bucket (1). The discharge end of the grading assembly (3) is fixed with a discharge pipe (7), and an induced draft fan (8) is fixed in the middle of the discharge pipe (7). The grading component (3) includes a grading tank (301), a dispersing disc (302) is rotatably mounted inside the grading tank (301), and a lead screw (307) is fixedly connected to the bottom of the dispersing disc (302). A lifting slide plate (309) is sleeved on the outside of the lead screw (307), and a scraper disc (303) is fixed on the outside of the lifting slide plate (309). A rotating rod (304) is fixed at the bottom of the lead screw (307), and a scraper (306) that fits against the bottom of the grading tank (301) is fixed on one side of the rotating rod (304).

2. A closed-circuit grinding system with an external classification mill for fine and high content of powdery raw material according to claim 1, characterized in that: Guide rods (308) are provided on both the left and right sides of the lead screw (307), and the guide rods (308) pass through the interior of the lifting slide plate (309). A support frame (305) is fixed at the bottom of the guide rod (308), and the support frame (305) is fixed inside the grading tank (301).

3. A closed-circuit grinding system with an external classification mill for fine and high content of powdery raw material according to claim 2, characterized in that: A guide pipe (5) is provided above the dispersing disc (302), and the guide pipe (5) passes through the interior of the classifying tank (301). The end of the guide pipe (5) is fixedly connected to the discharge end of the lifting component (4), and the axis of the guide pipe (5) coincides with that of the dispersing disc (302).

4. A closed-circuit grinding system with an external classification mill for fine grinding high content of fine powdery feed material according to claim 3, characterized in that: An air supply pipe (6) is fixedly connected to one side of the grading tank (301), and the air supply pipe (6) runs obliquely upward through the interior of the grading tank (301).

5. A closed-circuit grinding system with an external classification mill for fine grinding high content of fine powdery feed material according to claim 4, characterized in that: The lifting assembly (4) includes a lifting housing (401), a spiral auger (404) is rotatably installed inside the lifting housing (401), and a heating chamber (402) is provided outside the lifting housing (401), and an insulation shell (403) is provided outside the heating chamber (402).

6. A closed-circuit grinding system with an external classification mill for fine and high content of powdery raw material according to claim 5, characterized in that: The front end of the elevator housing (401) is also provided with a feed inlet, and an electric heating wire (405) is fixed on the inner wall of the heating chamber (402).

7. A closed-circuit grinding system with an external classification mill for fine grinding high content of fine powdery feed material according to claim 6, characterized in that: The vertical mill assembly (2) includes a vertical mill housing (201), a grinding disc (203) is rotatably installed inside the vertical mill housing (201), and a grinding roller (204) is rotatably connected above the grinding disc (203). The bottom of the intermediate hopper (1) is fixed with a feed pipe (202) that penetrates the interior of the vertical mill housing (201).

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