CN216039745U - Single-shaft vacuum strong blast furnace hematite extruder - Google Patents

Abstract

The utility model discloses a single-shaft vacuum high-strength high-furnace hematite extruder which comprises a driving motor, a mud extruding cylinder, a porous sieve plate, an extruding conical cylinder, a spiral extruding shaft and a vacuum pumping system, wherein the mud extruding cylinder comprises a feeding section and a conveying section which are sequentially connected, the inner cavity of the feeding section is in a conical shape with the inner diameter gradually reduced towards one side of the conveying section, and the porous sieve plate is fixedly arranged at the connecting part of the feeding section and the conveying section of the mud extruding cylinder; the extrusion conical cylinder is connected with the tail end of the conveying section of the mud extrusion cylinder; the spiral extrusion shaft comprises a mandrel and spiral blades, the spiral blades are arranged on the mandrel positioned in the mud extrusion cylinder and comprise a feeding section, a compression section and an extrusion section which are sequentially arranged, the feeding section has a taper matched with an inner cavity of the feeding section of the mud extrusion cylinder, and the spiral pitches of the feeding section, the compression section and the extrusion section are sequentially reduced; the vacuum pumping system is communicated with the mud-extruding cylinder conveying section. The utility model realizes continuous granulation by vacuum pumping and powerful extrusion, and the extruded product has small porosity and high compactness and cold and hot mechanical strength.

Description

Single-shaft vacuum strong blast furnace hematite extruder

Technical Field

The utility model belongs to the technical field of extruders, and particularly relates to a single-shaft vacuum strong blast furnace hematite extruder.

Background

The main raw materials for iron making are iron ore, coke, limestone and air. The iron ore includes hematite, magnetite, etc. Before smelting, the ore is selected to remove other impurities and improve the grade of iron ore, then the ore is crushed and ground, a plurality of iron ore raw materials with different sizes and granularities are mixed by a mixer, particles with different shapes are produced by a granulating and agglomerating machine, and the produced granular iron ore raw materials are put into a sintering furnace to be sintered into iron-making raw materials.

The traditional granulation and agglomeration method mainly comprises the following steps: the sintering method comprises the following steps: mixing the secondary mineral powder and the concentrate powder, heating at high temperature, and sintering under the condition of incomplete melting to form blocks; a pelletizing method: mixing fine ore powder, adding water to wet and roll the mixture on pelletizing equipment to form green pellets, and roasting and solidifying the green pellets; a briquetting method: pressing the mixed powder material in a mold to form a lump with certain shape and size. These several agglomeration methods have certain drawbacks: high energy consumption, high carbon emission, low production efficiency, high product porosity and the like.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides the single-shaft vacuum high-furnace hematite extruder, continuous granulation is realized through vacuumizing and high-force extrusion, and extruded granular ore can be directly put into a blast furnace for ironmaking, so that the performance requirement of the blast furnace on charging materials is completely met.

The technical scheme adopted by the utility model is as follows: a single-shaft vacuum high-furnace hematite extruder comprises a driving motor, a mud extruding cylinder, a porous sieve plate, an extruding conical cylinder, a spiral extruding shaft and a vacuum pumping system, wherein the mud extruding cylinder comprises a feeding section and a conveying section which are sequentially connected, the inner cavity of the feeding section is in a conical shape with the inner diameter gradually reduced towards one side of the conveying section, and the upper part of the feeding section is connected with a charging hopper; the porous sieve plate is fixedly arranged at the joint of the feeding section and the conveying section of the mud extruding cylinder; the extrusion conical cylinder is connected with the tail end of the conveying section of the mud extrusion cylinder; the spiral extrusion shaft comprises a mandrel and a spiral blade, one end of the mandrel is in transmission connection with the driving motor, the other end of the mandrel extends into the mud extrusion cylinder, the spiral blade is installed on the mandrel located in the mud extrusion cylinder, the spiral blade comprises a feeding section, a compression section and an extrusion section which are sequentially arranged, the feeding section is located in the mud extrusion cylinder feeding section, the outer diameter of the feeding section has a taper matched with the inner cavity of the mud extrusion cylinder feeding section, the spiral pitch of the extrusion section is smaller than that of the compression section, and the spiral pitch of the compression section is smaller than that of the feeding section; and the vacuumizing system is communicated with one end, close to the porous sieve plate, of the mud extruding cylinder conveying section.

Furthermore, the mud extruding cylinder comprises an outer cylinder and an inner cylinder, and an interlayer water cooling cavity is arranged between the outer cylinder and the inner cylinder.

Furthermore, a plurality of grooves extending along the discharging direction are formed in the inner wall of the mud extruding cylinder.

Furthermore, a water cooling hole for introducing circulating cooling water is formed in the shaft center part of the spiral extrusion shaft mandrel, and the end part of the mandrel, which is positioned on one side of the driving motor, is connected with a circulating water cooling system.

Further, the tail part of the spiral extrusion shaft is a conical spiral.

Further, the periphery of the helical blade is inlaid with high-wear-resistance alloy.

Furthermore, the spiral extrusion shaft is in direct-coupled transmission connection with the driving motor.

Further, the driving motor is a large-speed-ratio speed reduction motor.

Further, the driving motor is a bevel gear-spiral bevel gear speed reducing motor.

The utility model has the beneficial effects that:

(1) the extrusion screw of the utility model has variable diameter and variable pitch, and the tail part is a conical screw, so that the extrusion screw has strong extrusion pressure which can reach more than 10MPa, and the compactness and strength of the product can be obviously improved due to high pressure;

(2) the feeding section of the mud squeezing barrel is designed into a conical shape, so that the problem of slow feeding or no feeding can be greatly improved;

(3) the periphery of the spiral blade is embedded with high-wear-resistant alloy, so that the service life of the spiral shaft can be prolonged;

(4) the water cooling mechanisms are arranged on the mud-extruding cylinder and the spiral extruding shaft, so that the temperature rise requirement of the iron ore mixed mud can be met;

(5) a porous sieve plate is arranged between the feeding section and the conveying section of the mud extrusion cylinder, so that the conveying section of the mud extrusion cylinder can be ensured to reach the vacuum degree required by the product process, the porosity of the extruded product is reduced, the mud refining effect is enhanced, and the extruded particles have higher compactness;

(6) the spiral extrusion shaft and the driving motor are directly connected, so that the structure is compact, the mechanical efficiency is improved, and the maintenance cost can be reduced.

The extruder provided by the utility model realizes continuous granulation by vacuum-pumping powerful extrusion, the extruded granular product has small porosity and high compactness and cold and hot mechanical strength, the extruded granular ore is directly put into a blast furnace for iron making without sintering process, the performance requirements of the blast furnace on furnace charge (proper and uniform granularity of furnace charge, less powder, high mechanical cold and hot strength and the like) can be completely met, the extruder can replace the traditional granulation modes such as sintering method, pelletizing method, briquetting method and the like, and meanwhile, the blast furnace iron smelting ore produced by the utility model can save energy by more than 5%, reduce carbon emission by more than 10%, has obvious energy-saving and emission-reducing effects and obviously improves the production efficiency because the blast furnace iron smelting ore does not need sintering to produce waste gas and waste residue.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural view of the mud-extruding cylinder of the present invention.

Fig. 3 is a schematic view of the direction a-a in fig. 1.

FIG. 4 is a partial schematic view of a helical extrusion shaft of the present invention.

Detailed Description

In order to facilitate an understanding of the utility model, the utility model will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the utility model is not limited to the specific embodiments below.

As shown in fig. 1-4, the single-shaft vacuum strong-furnace hematite extruder of the embodiment comprises a driving motor 1, a mud-extruding cylinder 2, a porous sieve plate 3, an extruding cone 4, a spiral extruding shaft 5, and a vacuum-pumping system 6.

The driving motor 1 is a large-speed-ratio speed reducing motor, adopts a bevel gear-spiral bevel gear speed reducing motor, has higher mechanical efficiency, large transmission ratio, low noise and long service life, and adopts a frequency conversion speed regulation mode to meet the requirements of torque and speed of different product processes. The spiral extrusion shaft 5 and the driving motor 1 are in direct connection, so that the structure is compact, the mechanical efficiency is improved, and the maintenance cost can be reduced.

The mud-extruding cylinder 2 is designed into a slotted double-layer water-cooling mud cylinder and comprises an outer cylinder 203 and an inner cylinder 204, an interlayer water-cooling cavity 205 is arranged between the outer cylinder 203 and the inner cylinder 204, circulating cooling water is introduced to meet the temperature rise requirement of iron ore mixed mud, and a plurality of grooves 206 extending along the discharging direction are arranged on the inner wall of the inner cylinder 204; the mud squeezing barrel 2 is divided into a feeding section 201 and a conveying section 202 which are connected in sequence, the inner cavity of the feeding section 201 is in a conical shape with the inner diameter gradually reduced towards one side of the conveying section 202, and the upper part of the feeding section 201 is connected with a feeding hopper 7, so that the problem of slow feeding or no feeding can be greatly improved; the porous sieve plate 3 is fixedly arranged at the joint of the feeding section 201 and the conveying section 202 of the mud extrusion cylinder, so that the mud refining effect can be enhanced, the conveying section 202 of the mud extrusion cylinder is ensured to have certain vacuum degree, and extruded particles have higher compactness; the extrusion cone 4 is connected with the tail end of the mud extrusion cylinder conveying section 202.

The spiral extrusion shaft 5 comprises a mandrel 501 and a spiral blade 502, one end of the mandrel 501 is in transmission connection with the driving motor 1, the other end of the mandrel 501 extends into the extrusion barrel 2, the spiral blade 502 is installed on the mandrel 501 in the extrusion barrel 2, the spiral blade 502 comprises a feeding section 502a, a compression section 502b and an extrusion section 502c which are sequentially arranged, and the tail part of the extrusion section 502c is a conical spiral; the feeding section 502a is positioned in the mud-extruding cylinder feeding section 201, the outer diameter of the feeding section 502a has a taper matched with the inner cavity of the mud-extruding cylinder feeding section 201, the iron ore mixture is pushed through the section and is sent into the compression section 502b through the porous sieve plate 3, the helical pitch of the compression section 502b is smaller than that of the feeding section 502a, the iron ore mixture is compressed once in the section and is further pushed forwards to be sent into the extrusion section 502c, the helical pitch of the extrusion section 502c is smaller than that of the compression section 502b, strong extrusion force can be generated to enable the iron ore mixture to be compressed continuously for the second time in the section, the iron ore mixture is sent into the extrusion cone 4 to be further compressed after being continuously compressed by the extrusion section 502c, and then the iron ore mixture is extruded into high-strength iron ore particles through a mold tube. Because the iron ore mixture has high hardness and strong damage to the helical blade, the periphery of the helical blade 502 is inlaid with high-wear-resistant alloy.

The shaft center part of the spiral extrusion shaft mandrel 501 is provided with a water cooling hole 503 for introducing circulating cooling water, the end part of the mandrel 501, which is positioned on one side of the driving motor 1, is connected with a circulating water cooling system, and the water cooling system is guaranteed by a water cooling machine with rated flow not less than 24L/min, so that the requirement of temperature rise of iron ore pug is met.

The vacuum pumping system 6 is communicated with one end of the mud-extruding cylinder conveying section 202 close to the porous sieve plate 3, so that the conveying section 202 has a certain vacuum degree, and the maintenance of the vacuum degree is guaranteed by a vacuum pump with the pumping speed of 20m3/h or more.

Many modifications and other embodiments of the utility model will come to mind to one skilled in the art to which this invention pertains having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the utility models are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (9)

1. The utility model provides a unipolar vacuum powerful stove hematite extruder, includes driving motor (1), crowded mud section of thick bamboo (2), porous sieve board (3), extrudes a awl section of thick bamboo (4), spiral extrusion axle (5), evacuation system (6), its characterized in that: the mud squeezing barrel (2) comprises a feeding section (201) and a conveying section (202) which are sequentially connected, the inner cavity of the feeding section (201) is in a conical shape with the inner diameter gradually reduced towards one side of the conveying section (202), and the upper part of the feeding section (201) is connected with a feeding hopper (7); the porous sieve plate (3) is fixedly arranged at the connecting part of the feeding section (201) and the conveying section (202) of the mud extruding cylinder; the extrusion conical cylinder (4) is connected with the tail end of the mud extrusion cylinder conveying section (202); the spiral extrusion shaft (5) comprises a mandrel (501) and spiral blades (502), one end of the mandrel (501) is in transmission connection with the driving motor (1), the other end of the mandrel (501) extends into the mud extrusion barrel (2), the spiral blades (502) are installed on the mandrel (501) located in the mud extrusion barrel (2), each spiral blade (502) comprises a feeding section (502 a), a compression section (502 b) and an extrusion section (502 c) which are sequentially arranged, the feeding section (502 a) is located in the mud extrusion barrel feeding section (201), the outer diameter of the feeding section (502 a) is provided with a taper matched with the inner cavity of the mud extrusion barrel feeding section (201), the spiral pitch of the extrusion section (502 c) is smaller than that of the compression section (502 b), and the spiral pitch of the compression section (502 b) is smaller than that of the feeding section (502 a); and the vacuum pumping system (6) is communicated with one end of the mud-extruding cylinder conveying section (202) close to the porous sieve plate (3).

2. A single-shaft vacuum high-furnace hematite extruder as set forth in claim 1, wherein: the mud squeezing barrel (2) comprises an outer barrel (203) and an inner barrel (204), and an interlayer water cooling cavity (205) is arranged between the outer barrel (203) and the inner barrel (204).

3. A single-shaft vacuum high-furnace hematite extruder as set forth in claim 1, wherein: and a plurality of grooves (206) extending along the discharging direction are arranged on the inner wall of the mud-extruding cylinder (2).

4. A single-shaft vacuum high-furnace hematite extruder as set forth in claim 1, wherein: the shaft center part of the spiral extrusion shaft mandrel (501) is provided with a water cooling hole (503) for introducing circulating cooling water, and the end part of the mandrel (501) positioned on one side of the driving motor (1) is connected with a circulating water cooling system.

5. A single-shaft vacuum high-furnace hematite extruder as set forth in claim 1, wherein: the tail part of the spiral extrusion shaft (5) is a conical spiral.

6. A single-shaft vacuum high-furnace hematite extruder as set forth in claim 1, wherein: the periphery of the helical blade (502) is embedded with high-wear-resistance alloy.

7. A single-shaft vacuum high-furnace hematite extruder as set forth in claim 1, wherein: the spiral extrusion shaft (5) is in direct-connected transmission connection with the driving motor (1).

8. A single-shaft vacuum high-furnace hematite extruder as set forth in claim 1, wherein: the driving motor (1) is a large-speed-ratio speed reducing motor.

9. A single-shaft vacuum high-furnace hematite extruder as set forth in claim 8, wherein: the driving motor (1) is a bevel gear-spiral bevel gear speed reducing motor.

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