Blast furnace ironmaking raw material mixing and stirring device

Abstract

The utility model discloses a blast furnace ironmaking raw material mixing and stirring device which comprises a tank body and a feeding hopper arranged at the top of the tank body, two inclined cylinders are symmetrically arranged on the upper portion in the tank body, the lower ends of the two inclined cylinders are communicated with each other, rotating shafts are coaxially arranged in the inclined cylinders, grinding rollers and lifting plates are alternately arranged in the inclined cylinders, and the grinding rollers are connected with the rotating shafts through connecting rods. The bottom of the joint of the two inclined cylinders is provided with a blanking pipe, a vertical shaft is coaxially arranged in the tank body below the blanking pipe, the lower end of the vertical shaft extends out of the bottom of the tank body and then is in transmission connection with a motor, the vertical shaft is sequentially provided with a material throwing cone, a plurality of stirring blades and a scraping plate from top to bottom, and the lower end face of the scraping plate makes contact with the bottom of the tank body. A screw conveyer is vertically arranged on the outer side of the tank body, an inlet in the lower part of the screw conveyer is communicated with an opening in the bottom of the tank body, and an outlet in the upper part is communicated with the blanking pipe through an inclined pipe. In conclusion, the stirring device has the advantages of high working efficiency, capability of eliminating a stirring blind area and high mixing efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of ironmaking raw material mixing and stirring devices, specifically to a blast furnace ironmaking raw material mixing and stirring device. Background Technology

[0002] Blast furnace ironmaking is a crucial step in modern steel production. It involves continuously producing liquid pig iron in a vertical reactor, also known as a blast furnace, using iron-bearing ores such as coke, natural rich ore, sinter, and pellets, along with fluxes such as limestone and dolomite. During ironmaking, raw materials such as iron ore, coke, and limestone are mixed in a certain proportion to form furnace charge. The ironmaking raw material mixing device is an auxiliary device used to mix these raw materials during the ironmaking process.

[0003] Existing ironmaking raw material mixing devices have the following problems: First, they can only mix raw materials through the stirring action of the stirring blades, resulting in low mixing efficiency, insufficient and uneven mixing, and poor mixing effect. Second, raw materials located at the bottom and edges of the mixing device often fail to receive effective mixing, leading to the emergence of mixing blind zones and reducing the mixing effect. Therefore, it is an objective need to develop a high-efficiency blast furnace ironmaking raw material mixing and stirring device that can eliminate mixing blind zones and achieve high mixing efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a blast furnace ironmaking raw material mixing and stirring device with high working efficiency, which can eliminate stirring blind spots and achieve high mixing efficiency.

[0005] The purpose of this utility model is achieved as follows: It includes a tank body and a feeding hopper located at the top of the tank body. Two inclined cylinders are symmetrically arranged in the upper part of the tank body. The higher ends of the inclined cylinders are fixedly connected to the tank body, and their lower ends are interconnected. The bottom of the feeding hopper is connected to the higher ends of the two inclined cylinders respectively through a distribution pipe. A rotating shaft is coaxially arranged inside the inclined cylinders. A crushing roller and a lifting plate are alternately arranged inside the inclined cylinders. The crushing roller is connected to the rotating shaft through a connecting rod, and the lifting plate is connected to the inclined cylinder. A discharge pipe is located at the bottom of the connection between the two inclined cylinders. A vertical shaft is coaxially arranged inside the tank body below the discharge pipe. The lower end of the vertical shaft extends out of the bottom of the tank body and is connected to a motor. From top to bottom, a throwing cone, several stirring blades, and a scraper are arranged on the vertical shaft. The lower end face of the scraper contacts the bottom of the tank body. A screw conveyor is vertically arranged on the outside of the tank body. The lower inlet of the screw conveyor is connected to an opening at the bottom of the tank body, and the upper outlet is connected to the discharge pipe through an inclined pipe.

[0006] Furthermore, the distance between the roller surfaces of multiple rolling rollers and the inner wall of the inclined cylinder gradually decreases along the direction of the furnace charge flow.

[0007] Furthermore, the rolling roller is provided with several protrusions.

[0008] Furthermore, several rebound plates are evenly distributed around the circumference of the throwing cone. The surfaces of the rebound plates are inclined downwards, and the rebound plates are connected to the inner wall of the tank by springs.

[0009] Furthermore, an exhaust pipe is installed on the top of the tank, and an exhaust fan and a gas purifier are installed on the exhaust pipe in sequence. The dust discharge port of the gas purifier is connected to the feed hopper.

[0010] Furthermore, an agitator is installed at the upper end of the vertical shaft after it extends into the discharge pipe.

[0011] Furthermore, the number of screw conveyors is 2 to 4, evenly distributed along the circumference of the tank.

[0012] Furthermore, a storage bin is installed at the bottom of the tank, and a sealing door that is easy to open and close is installed at the bottom of the screw conveyor housing after it extends into the storage bin.

[0013] In operation, blast furnace ironmaking raw materials such as iron ore, coke, and limestone are fed into the hopper in a certain proportion. They then enter two inclined cylinders through the distribution pipe. Under their own gravity, the materials roll along the inclined cylinders. The rotating shaft drives the crushing rollers to rotate, crushing and reducing the size of the raw materials. Simultaneously, the lifting plates lift the raw materials for initial mixing. After crushing and initial mixing, the raw materials fall through the discharge pipe. At this time, the motor drives the vertical shaft to rotate, which in turn drives the throwing cone, stirring blades, and scrapers to rotate. When the raw materials fall onto the throwing cone, they are subjected to centrifugal force and thrown outwards, dispersing the materials and promoting mixing. They then fall into the tank, where the stirring blades agitate and mix the materials. The materials at the bottom of the tank roll outwards under the action of the scrapers, eventually entering the screw conveyor through an opening at the bottom of the tank. They are then conveyed upwards by a bolt conveyor, and finally enter the discharge pipe through the inclined pipe, re-entering the tank for further mixing. This invention incorporates an inclined cylinder. Inside the inclined cylinder, the raw materials are first crushed using a crushing roller, then initially mixed using a lifting plate, subsequently dispersed using a throwing cone to promote mixing, and then stirred by stirring blades. Finally, the raw materials are conveyed into the tank by a screw conveyor, forming a continuously repeating mixing cycle. Thus, the raw materials undergo multiple mixing processes—crushing, initial mixing, throwing mixing, and stirring—and are then circulated and stirred with the assistance of the screw conveyor. This process achieves high mixing efficiency and ensures thorough and uniform mixing of various materials, resulting in a superior mixing effect. Furthermore, this invention includes a scraper. During rotation, the scraper agitates the raw materials at the bottom of the tank and throws them outwards, allowing them to return to the upper part of the tank via the screw conveyor and participate in the mixing process again. This process solves the problem in current mixing devices where materials at the bottom and edges are not effectively mixed, ensuring all materials are well-mixed, eliminating blind spots, and improving the overall mixing effect. In summary, this utility model has the advantages of high working efficiency, elimination of stirring blind spots, and high mixing efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] In the diagram: 1-tank body, 2-feed hopper, 3-inclined cylinder, 4-distribution pipe, 5-rolling roller, 6-lifting plate, 7-dropping pipe, 8-vertical shaft, 9-throwing cone, 10-stirring blade, 11-scraper, 12-screw conveyor, 13-opening, 14-protrusion, 15-bounce plate, 16-spring, 17-exhaust fan, 18-gas purifier, 19-stirring rod, 20-storage box, 21-sealing door, 22-inclined pipe. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0017] like Figure 1 As shown, this utility model includes a tank body 1 and a feeding hopper 2 located at the top of the tank body 1. Two inclined cylinders 3 are symmetrically arranged in the upper part of the tank body 1. The higher ends of the inclined cylinders 3 are fixedly connected to the tank body 1, and their lower ends are interconnected. The bottom of the feeding hopper 2 is connected to the higher ends of the two inclined cylinders 3 respectively through a distribution pipe 4. A rotating shaft is coaxially arranged inside the inclined cylinders 3. In actual use, the rotating shaft is driven to rotate using a corresponding driving device. A pressing roller 5 and a lifting plate 6 are alternately arranged inside the inclined cylinders 3. The pressing roller 5 is connected to the rotating shaft through a connecting rod, and the lifting plate 6 is connected to the inclined cylinder 3. A discharge pipe 7 is provided at the bottom of the connection between the two inclined cylinders 3. The tank body 1 is located below the discharge pipe 7. A vertical shaft 8 is coaxially arranged inside the tank. The lower end of the vertical shaft 8 extends out of the bottom of the tank body 1 and is connected to a motor. The motor is existing equipment and can be purchased, installed and used in the market according to parameters such as power and speed. From top to bottom, the vertical shaft 8 is arranged with a material throwing cone 9, several stirring blades 10 and scraper 11. The lower end face of the scraper 11 contacts the bottom of the tank body 1. A screw conveyor 12 is vertically arranged on the outside of the tank body 1. The screw conveyor 12 is existing equipment and is used to transport the raw materials upward to the upper part of the tank body 1. The inlet at the lower part of the screw conveyor 12 is connected to the opening 13 at the bottom of the tank body 1, and the outlet at the upper part is connected to the discharge pipe 7 through the inclined pipe 22.

[0018] In operation, blast furnace ironmaking raw materials such as iron ore, coke, and limestone are fed into hopper 2 in a certain proportion and then enter two inclined cylinders 3 through distribution pipe 4. Under their own gravity, they roll along the inclined cylinders 3. The rotating shaft drives the crushing roller 5 to rotate, crushing and reducing the size of the raw materials. At the same time, the lifting plate 6 lifts the raw materials for preliminary mixing. The crushed and preliminarily mixed raw materials fall through the discharge pipe 7. At this time, the motor drives the vertical shaft 8 to rotate, which in turn drives the throwing cone 9 and the stirring blade 1. As the scraper 11 rotates, when the raw material falls onto the throwing cone 9, it is subjected to centrifugal force and thrown outwards to the sides of the throwing cone 9, dispersing the raw material and promoting the mixing of various raw materials. Then it falls into the tank 1, where the stirring blade 10 stirs and mixes the raw material. The raw material at the bottom of the tank 1 rolls around under the action of the scraper 11 and finally enters the screw conveyor 12 through the opening 13 at the bottom of the tank 1. It is then conveyed upwards by the bolt conveyor 12, and then enters the discharge pipe 7 through the inclined pipe 22, and enters the tank 1 again for stirring and mixing.

[0019] In this invention, an inclined cylinder 3 is provided. When the raw material is inside the inclined cylinder 3, it is first crushed by a crushing roller, then initially mixed by a lifting plate 6, followed by dispersion by a throwing cone 9 to promote mixing, then agitation by a stirring blade 10, and finally conveyed to the tank 1 by a screw conveyor 12, forming a continuously repeating mixing cycle. Thus, the raw material undergoes multiple mixing processes, including crushing, initial mixing, throwing mixing, and stirring, and with the assistance of the screw conveyor 12, a continuous cyclic mixing process is achieved, resulting in high mixing efficiency. While ensuring high efficiency, this invention also allows for thorough mixing of various raw materials, resulting in a more uniform and effective mixture. Furthermore, the invention incorporates a scraper 11, which, during rotation, agitates the raw materials at the bottom of the tank 1 and throws them outwards, allowing them to return to the upper part of the tank 1 via the screw conveyor 12 and participate in the mixing process again. This process effectively addresses the problem in current mixing devices where materials at the bottom and edges are not adequately mixed, ensuring all materials are well-mixed, eliminating blind spots, and improving the overall mixing effect.

[0020] When this device is in use, the raw material is squeezed between the crushing roller 5 and the inner wall of the inclined cylinder 3. At this time, the raw material will be subjected to squeezing, kneading and twisting forces, which will cause the raw material to break. The distance between the roller surface of multiple crushing rollers 5 and the inner wall of the inclined cylinder 3 gradually decreases along the flow direction of the furnace charge. By adopting a graded crushing process, the raw material is gradually crushed, which can improve the crushing efficiency of the raw material.

[0021] The crushing roller 5 is provided with several protrusions 14. When in use, the raw material is squeezed between the crushing roller 5 and the inner wall of the inclined cylinder 3. At this time, the raw material will be subjected to forces such as squeezing, kneading and twisting, which will cause the raw material to break. The protrusions 14 are provided because the contact area between the protrusions 14 and the raw material is smaller, which increases the force per unit area of ​​the raw material, making it easier to break and improving the crushing efficiency of the raw material.

[0022] Several rebound plates 15 are evenly distributed around the circumference of the throwing cone 9. The surface of the rebound plates 15 is inclined downwards, and the rebound plates 15 are connected to the inner wall of the tank body 1 by springs 16. During operation, the raw material falls from the discharge pipe 7 onto the throwing cone 9, and is then thrown outwards under the action of centrifugal force and its own gravity. In actual use, it was found that the raw material would fall into the annular area near the edge of the tank 1, resulting in less material falling into the tank 1, which is not conducive to the full mixing of the raw material. To solve this problem, a rebound plate 15 is set up. The rebound plate 15 has the following functions: First, when the raw material flies out, it will collide with the rebound plate 15, and the raw material will be further broken under the impact force, which is beneficial to subsequent mixing and use. Second, when the raw material hits the rebound plate 15, the spring 16 is compressed and then quickly rebounds, changing the direction of the raw material's flight, causing the raw material to fall towards the center of the tank 1, which is conducive to the full mixing of the raw material. Third, the raw material flying outwards from the throwing cone 9 would originally hit the inner wall of the tank 1. With the extension of the usage time, the inner wall of the tank 1 is prone to deformation or even damage, which increases the frequency of inspection and maintenance and maintenance costs. The rebound plate 15 can prevent the raw material from hitting the tank 1, thus protecting the tank 1.

[0023] The top of the tank 1 is equipped with an exhaust pipe, on which a blower 17 and a gas purifier 18 are sequentially installed. The dust outlet of the gas purifier 18 is connected to the feed hopper 2. The blower 17 and the gas purifier 18 are existing equipment. When this device is running, it will generate a large amount of dust. In order to avoid pollution of the surrounding environment, the blower 17 is started to draw away the dust in the tank 1 and send it to the gas purifier 18 for purification treatment, separating the dust from the air. At the same time, the separated dust still has utilization value and is returned to the feed hopper 2 to reduce or avoid the loss of raw materials.

[0024] After the upper end of the vertical shaft 8 extends into the discharge pipe 7, an agitator 19 is installed. In actual use, it was found that the raw material discharged from the inclined cylinder 3 may block the discharge pipe 7, affecting the normal operation of the device. In order to solve this problem, the agitator 19 was installed. The agitator 19 can agitate the raw material in the discharge pipe 7 to prevent the raw material from blocking the discharge pipe 7.

[0025] The number of screw conveyors 12 is 2 to 4, evenly distributed along the circumference of the tank body 1. The screw conveyors 12 are used to transport the raw materials discharged from the bottom opening 13 of the tank body 1 to the upper part of the tank body 1. Generally, 2 to 4 can be set. Generally speaking, the more screw conveyors there are, the faster the raw material circulation speed will be. However, the actual number of screw conveyors needs to be determined according to specific parameters such as the volume of the tank body 1 and the amount of raw materials, so as to meet the circulation and mixing requirements of the raw materials.

[0026] After the blast furnace ironmaking raw materials such as iron ore, coke, and limestone are mixed in this device, a storage tank 20 is provided below the tank body 1 to facilitate the discharge and storage of the mixed raw materials. The lower end of the screw conveyor 12 extends into the storage tank 20 and is equipped with a sealing door 21 that is easy to open and close. The sealing door 21 is existing technology and can be remotely controlled to open and close. When the raw materials are mixed, the sealing door 21 is opened and the raw materials fall from the lower end of the screw conveyor 12 into the storage tank 20. When the device is operating normally, the sealing door 21 only needs to be closed.

Claims

1. A mixing and stirring device for blast furnace ironmaking raw materials, comprising a tank (1) and a feeding hopper (2) disposed on the top of the tank (1), characterized in that... The upper part of the tank (1) is symmetrically provided with two inclined cylinders (3). The higher end of the inclined cylinders (3) is fixedly connected to the tank (1), and the lower end is connected to each other. The bottom of the feed hopper (2) is connected to the higher end of the two inclined cylinders (3) respectively through the distribution pipe (4). A rotating shaft is coaxially provided in the inclined cylinder (3). A crushing roller (5) and a lifting plate (6) are alternately arranged in the inclined cylinder (3). The crushing roller (5) is connected to the rotating shaft through a connecting rod. The lifting plate (6) is connected to the inclined cylinder (3). A discharge pipe (7) is provided at the bottom of the connection between the two inclined cylinders (3). 7) A vertical shaft (8) is coaxially arranged inside the tank (1) below. The lower end of the vertical shaft (8) extends out of the bottom of the tank (1) and is connected to a motor. A material throwing cone (9), several stirring blades (10) and a scraper (11) are arranged on the vertical shaft (8) from top to bottom. The lower end face of the scraper (11) is in contact with the bottom of the tank (1). A screw conveyor (12) is vertically arranged on the outside of the tank (1). The inlet of the screw conveyor (12) at the bottom is connected to the opening (13) at the bottom of the tank (1), and the outlet at the top is connected to the drop pipe (7) through the inclined pipe (22).

2. The blast furnace ironmaking raw material mixing and stirring device according to claim 1, characterized in that... The distance between the roller surface of multiple rolling rollers (5) and the inner wall of the inclined cylinder (3) gradually decreases along the direction of the furnace charge flow.

3. The blast furnace ironmaking raw material mixing and stirring device according to claim 1, characterized in that... The rolling roller (5) is provided with several protrusions (14).

4. The blast furnace ironmaking raw material mixing and stirring device according to claim 1, characterized in that... The material throwing cone (9) is surrounded by several rebound plates (15) with the plate surface of the rebound plate (15) tilted downwards. The rebound plate (15) is connected to the inner wall of the tank (1) by a spring (16).

5. The blast furnace ironmaking raw material mixing and stirring device according to claim 1, characterized in that... The top of the tank (1) is provided with an exhaust pipe, and an exhaust fan (17) and a gas purifier (18) are arranged on the exhaust pipe in sequence. The dust discharge port of the gas purifier (18) is connected to the feed hopper (2).

6. The blast furnace ironmaking raw material mixing and stirring device according to claim 1, characterized in that... The upper end of the vertical shaft (8) extends into the material drop pipe (7) and is equipped with a stirring rod (19).

7. The blast furnace ironmaking raw material mixing and stirring device according to claim 1, characterized in that... The number of screw conveyors (12) is 2 to 4, and they are evenly distributed along the circumference of the tank (1).

8. The blast furnace ironmaking raw material mixing and stirring device according to claim 1, characterized in that... A storage box (20) is provided below the tank (1), and a sealing door (21) that is easy to open and close is provided after the lower end of the screw conveyor (12) extends into the storage box (20).

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