Pellet feeding system

Abstract

According to the pellet feeding system provided by the invention, the structure of the pellet feeding system is improved, so that the reduction efficiency of a shaft furnace can be improved. The pellet feeding system comprises a fixed screen assembly, a first vibrating screen assembly, a storage assembly and a second vibrating screen assembly. The fixed screen assembly is provided with a fixed screen feeding port, a fixed screen discharging port and a fixed screen undersize outlet. The first vibrating screen assembly comprises a first screen feeding port and a first screen undersize outlet. The second vibrating screen assembly comprises a second screen feed port and a second screen undersize outlet; the fixed screen feed port is used for being communicated with a material source part; an undersize product outlet of the fixed screen is communicated with a feeding hole of the first screen, and an undersize product outlet of the first screen is communicated with a feeding hole of the material storage assembly; a discharging port of the storage assembly communicates with a feeding port of the second screen, and a screen underflow outlet of the second screen is used for communicating with a fuel inlet of the shaft furnace so as to provide fuel for the shaft furnace.

Description

Technical Field

[0001] The invention relates to the technical field of iron ore reduction, and in particular to a pelletizing ore feeding system. Background Art

[0002] With the continuous advancement of global steel industry technology, gas-based shaft furnace direct iron reduction technology has developed rapidly in recent years due to its high efficiency and environmental protection. This technology uses reducing gases (such as hydrogen, carbon monoxide, etc.) to reduce iron ore at high temperatures without the need for traditional coke as a reducing agent, thereby effectively reducing production costs and reducing environmental pollution.

[0003] The reduction effect of the gas-based shaft furnace depends largely on the particle size distribution of the front-end raw material pellets. The ideal particle size range should be controlled within a suitable size range to ensure that the reducing gas can fully penetrate and contact the iron ore, thereby achieving an efficient reduction reaction. However, in the actual production process, the presence of fine powder and large-sized pellets has a significant adverse effect on the reduction effect of the shaft furnace. Fine powder can easily block the air flow channel and reduce the gas flow efficiency; while large-sized pellets may lead to incomplete reduction and affect product quality. Summary of the invention

[0004] The purpose of the present invention is to provide a pelletizing ore feeding system. By improving the structure of the pelletizing ore feeding system, unqualified fine powder can be screened in different sections of the pelletizing ore feeding system, thereby improving the reduction efficiency of the vertical furnace.

[0005] To achieve the above-mentioned purpose, the present invention provides a pelletizing ore feeding system, which comprises a fixed screen assembly, a first vibrating screen assembly, a storage assembly and a second vibrating screen assembly; the fixed screen assembly has a fixed screen feed port, a fixed screen discharge port and a fixed screen undersize outlet; the first vibrating screen assembly comprises a first screen feed port and a first screen undersize outlet; the second vibrating screen assembly comprises a second screen feed port and a second screen undersize outlet; the fixed screen feed port is used to communicate with a material source; the fixed screen undersize outlet is connected to the first screen feed port, and the first screen undersize outlet is connected to the feed port of the storage assembly; the discharge port of the storage assembly is connected to the second screen feed port, and the second screen undersize outlet is used to communicate with the fuel inlet of a vertical furnace to provide fuel for the vertical furnace.

[0006] In this way, by arranging a second vibrating screen assembly in front of the vertical furnace to screen the materials before entering the furnace again, the fine powder is screened out, and the reduction efficiency of the vertical furnace is significantly improved.

[0007] Optionally, the fixed screen assembly comprises a housing and at least one screen group located in the housing, the screen group being opposite to the fixed screen feed port;

[0008] The screen group comprises a plurality of inclined screen parts, and the screen parts are used to screen the material to form undersize material; the screen parts have a head end and a tail end in the extension direction thereof, the head end is used to enter the material, and the tail end is used to discharge the oversize material;

[0009] The two adjacent screen parts are defined as an upper screen part and a lower screen part, the head end of the upper screen part is far away from the tail end of the lower screen part in the height direction, and the tail end of the upper screen part is close to the head end of the lower screen part in the height direction.

[0010] By providing a screen group including axially connected screen parts, the residence time of the material passing through the fixed screen assembly is prolonged, thereby improving the screening efficiency of qualified materials.

[0011] Optionally, a plurality of the screen groups are included, and the plurality of the screen groups are all opposite to the fixed screen feed port; in the horizontal direction, the plurality of the screen groups are arranged relative to each other along the radial direction of the fixed screen feed port.

[0012] Through such an arrangement, the screening amount of materials by the fixed screen assembly per unit time is increased.

[0013] Optionally, the housing has a plurality of spaced-apart discharge channels for undersize material, which are arranged in sequence from the inside to the outside and are all connected to the undersize material outlet of the fixed screen; each of the undersize material discharge channels can be connected to the screen portion located at the same level in the height direction. The undersize material discharge channels arranged in sequence can collect multiple layers of undersize material, thereby simplifying the layout of the undersize material discharge channels.

[0014] Optionally, the housing is further provided with a plurality of independent waste channels, and the tail end of the bottommost screen of each screen group is connected to the waste channel one by one. The waste channel is connected to the bottommost screen to collect the waste remaining on the last screen.

[0015] Optionally, the housing is connected to a cylindrical feed pipe, which is connected to the fixed screen feed port; a conical material stopper is provided in the feed pipe, and in the height direction, the bottom of the cone is closer to the screen group than the top of the cone, and a gap is provided between the side wall of the material stopper and the tube wall of the feed pipe. By providing the conical material stopper, the gap between the material stopper and the feed pipe serves as a material drop channel, thereby realizing the operation of feeding several screen groups at the same time.

[0016] Optionally, the head ends of the screen parts located at the uppermost side of each screen group abut against each other to form an angle area, and the material blocking part covers the angle area in the height direction, so as to prevent the material from falling into the angle area.

[0017] Optionally, the material stopper can swing at a certain angle in the radial direction; the side wall of the feed pipe is further provided with an annular stopper ring, and the annular stopper ring extends inward from the side wall; the material stopper is located on the inner side of the annular stopper ring, and the interval is located between the inner side wall of the annular stopper ring and the side wall of the material stopper. Thus, the material stopper can adjust the material discharge amount of each screen group by swinging at a certain angle.

[0018] Optionally, the head end of one of the two adjacent screen sections belonging to the same screen group exceeds the tail end of the other screen section in the horizontal direction. Therefore, there is no need to set up additional pipelines to transport the screened material of one screen section to the next screen section, thereby simplifying the pipeline layout.

[0019] Optionally, each of the sieve parts comprises a sieve and a sieve frame, the sieve frame has a mounting channel, the sieve is slidably connected to the mounting channel; the mounting channel extends along the width direction of the sieve part, and a mounting opening is formed on the side of the sieve part. Thus, the sieve can be removed from the side of the sieve part, which facilitates the installation, maintenance and replacement of the sieve.

[0020] Optionally, it includes a storage output pipeline, through which the discharge port of the storage assembly is connected to the second screen feed port; it also includes a conveying part, which is used to transport the screened material of the second vibrating screen assembly to the vertical furnace; it also includes a feeding sub-pipe, one end of which is connected to the storage output pipeline, and the other end can be connected to the conveying part. In this way, during the maintenance of the second vibrating screen assembly, the material can be transported from the storage output pipeline to the vertical furnace, thereby ensuring the continuous operation of the system.

[0021] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0023] Figure 1 is a schematic structural diagram of a pelletizing feeding system in an embodiment of the present invention;

[0024] Figure 2 is a schematic structural diagram of a fixed screen assembly in an embodiment of the present invention;

[0025] Figure 3 It is a top view of the screen;

[0026] Figure 4 It is a schematic diagram of the layout of the second vibrating screen assembly in an embodiment of the present invention.

[0027] Reference numerals:

[0028] 100-material source; 200-fixed screen assembly; 201-screen group; 201-1-screen part; 202-angle area; 203-screen; 204-screen frame; 200a-fixed screen feed port; 200b-fixed screen discharge port; 200c-fixed screen undersize outlet; 300-shell; 301-undersize discharge channel; 302-waste channel; 303-blocking plate; 304-feeding pipe ;304-1- material blocking part;304-2- annular blocking ring;400- first vibrating screen assembly;401- first screen feed inlet;402- first screen undersize outlet;500- material storage assembly;501- material storage output pipeline;502- material feeding sub-pipe;600- conveying part;700- second vibrating screen assembly;701- second screen feed inlet;702- second screen undersize outlet;800- vertical furnace. DETAILED DESCRIPTION

[0029] The present invention provides a pelletizing ore feeding system. By improving the structure of the pelletizing ore feeding system, unqualified fine powder and pellets within a set size range can be screened in different sections of the pelletizing ore feeding system, thereby improving the reduction efficiency of the vertical furnace.

[0030] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0032] As the main raw material for shaft furnace reduction, pellets are usually fed in large quantities. In the existing screening system, the fixed screen is used as the preliminary screening equipment, and its screening efficiency directly affects the smooth progress of the subsequent processes. However, due to the large installation angle of the fixed screen (usually more than 40°), the residence time of the pellets on the screen surface is significantly shortened. When the feed volume is large, the thickness of the material layer increases, and the speed at which the pellets pass through the fixed screen increases, resulting in a large amount of qualified materials (particle size between 3 and 40 mm) not being effectively screened out. This phenomenon not only reduces the screening efficiency, but also increases production energy consumption and costs. According to statistics, about 35% of qualified materials are missed during the initial screening process.

[0033] Secondly, during the process of discharging from the raw material bin to the vertical furnace, the pellets undergo multiple frictions and transfers. The friction between the materials in the raw material bin and the repeated friction during the belt conveyor's reverse transportation of the materials after the bin is discharged result in the production of a large amount of fine powder. The particle size of these fine powders is less than 3mm, which cannot meet the requirements of vertical furnace reduction. In actual production, the content of pellet powder before entering the vertical furnace is as high as about 15%. These fine powders not only waste energy, but also occupy the reduction space of the vertical furnace, reducing the effective utilization rate of the vertical furnace. What's more serious is that the fine powder is easy to bond with qualified materials to form lumps, resulting in uneven airflow distribution in the vertical furnace, further affecting the reduction efficiency of the vertical furnace. After accurate calculation, the presence of fine powder has a significant impact on the annual output of qualified vertical furnaces.

[0034] Please refer to Figures 1 to 4 , Figure 1 is a schematic structural diagram of a pelletizing feeding system in an embodiment of the present invention; Figure 2 is a schematic structural diagram of a fixed screen assembly in an embodiment of the present invention; Figure 3 It is a top view of the screen; Figure 4 It is a schematic diagram of the layout of the second vibrating screen assembly in an embodiment of the present invention.

[0035] As shown in the figure, a pellet feeding system includes a fixed screen assembly 200, a first vibrating screen assembly 400, a storage assembly 500 and a second vibrating screen assembly 700 connected in sequence. The fixed screen assembly 200 has a fixed screen feed port 200a, a fixed screen discharge port 200b and a fixed screen undersize outlet 200c; the first vibrating screen assembly 400 includes a first screen feed port 401 and a first screen undersize outlet 402; the second vibrating screen assembly 700 includes a second screen feed port 701 and a second screen undersize outlet 702. The fixed screen feed port 200a is used to communicate with the material source 100. The double screening here means that before the material enters the first vibrating screen assembly 400, the oversize material can be screened twice instead of being directly discharged as waste. The specific secondary screening method is described in detail in the following embodiments.

[0036] The fixed screen undersize outlet 200c is connected to the first screen feed port 401, and the first screen undersize outlet 402 is connected to the feed port of the storage assembly 500; the discharge port of the storage assembly 500 is connected to the second screen feed port 701, and the second screen undersize outlet 702 is used to be connected to the fuel inlet of the vertical furnace 800 to provide fuel for the vertical furnace 800.

[0037] In this way, by arranging the second vibrating screen assembly 700 in front of the vertical furnace 800 to screen the materials before entering the furnace again, the fine powder is screened out, and the reduction efficiency of the vertical furnace 800 is significantly improved.

[0038] In this embodiment, the pellet feeding system includes a storage output pipeline 501, a feed sub-pipe 502 and a conveying unit 600, and the conveying unit 600 is used to transport the undersize of the second vibrating screen assembly 700 to the vertical furnace 800. The storage output pipeline 501 is provided with a valve. The discharge port of the storage assembly 500 is connected to the second screen feed port 701 through the storage output pipeline 501. One end of the feed sub-pipe 502 is connected to the storage output pipeline 501, and the other end can be connected to the conveying unit 600. The position where the feed sub-pipe 502 is connected to the storage output pipeline 501 is located upstream of the valve. In this way, the valve can be controlled to control whether the material enters the conveying unit 600 through the second vibrating screen or enters the conveying unit 600 through the feed sub-pipe 502. In this way, during the maintenance of the second vibrating screen assembly 700, the material can be transported from the storage output pipeline 501 to the vertical furnace 800, thereby ensuring the continuous operation of the system. The conveying part 600 may be a common conveying belt or the like.

[0039] The specific structure of the fixed screen assembly 200 in the present application is described below.

[0040] In this embodiment, the fixed screen assembly 200 includes a housing 300 and at least one screen group 201 located in the housing 300, and the screen group 201 is opposite to the fixed screen feed port 200a in the height direction and is located at the lower side thereof. The number of screen groups 201 can be one or two or more. Several screen groups 201 are opposite to the fixed screen feed port 200a; in the horizontal direction, several screen groups 201 are arranged relatively radially around the fixed screen feed port 200a. For convenience, two screen groups 201 are shown in the example shown in the figure, and the two screen groups 201 are arranged relatively to each other, thereby increasing the screening amount of the material by the fixed screen assembly 200 per unit time.

[0041] The screen group 201 has several inclined screens 201-1, and the screens 201-1 are used to screen the materials to form undersize materials. Each screen group 201 includes at least two screens 201-1. For the convenience of explanation, the example shown in the figure takes two screens 201-1 as an example for explanation. The materials move along the extension direction of the screen 201-1. In the process of passing through the screen 201-1, the qualified materials are screened by the upper side of the screen 201-1 under the action of gravity to form undersize materials. The remaining undersize materials continue to move along the extension direction of the screen 201-1.

[0042] The screen part 201-1 has a head end and a tail end in its extension direction. The head end is used to enter the material, and the tail end is used to discharge the material on the screen. The head end and the tail end of two adjacent screen parts 201-1 in the same group are connected to each other. The two adjacent screen parts 201-1 are an upper screen part and a lower screen part, respectively. The head end of the upper screen part and the tail end of the lower screen part are far away from each other in the height direction, and the tail end of the upper screen part and the head end of the lower screen part are close to each other in the height direction. Thus, a V-shaped structure placed approximately horizontally is formed. In accordance with this, the housing 300 is approximately a prismatic structure.

[0043] By providing the screen group 201, the screen group 201 includes axially connected screen parts 201-1, which prolongs the residence time of the material passing through the fixed screen assembly 200 and improves the screening efficiency of qualified materials.

[0044] Optionally, the head end of one of the two adjacent screen sections 201-1 belonging to the same screen group 201 horizontally exceeds the tail end of the other screen section 201-1. Therefore, there is no need to set up additional pipelines to transport the screened material of one screen section 201-1 to the next screen section 201-1, thereby simplifying the pipeline layout.

[0045] The technical effects of this implementation are described in detail below using a set of specific data.

[0046] Material layer thickness = incoming material quantity per unit time ÷ length of screen section 201 - 1 ÷ width of screen section 201 - 1 ÷ passage speed of material corresponding to screen section 201 - 1 .

[0047] Take the case of using only one screen section 201-1 as an example. The incoming material volume of the fixed screen feed port 200a is 2000t / h. 2000÷3600÷2.4÷3.2÷0.6=120mm (0.6m / s represents the speed of the material on the screen surface). That is to say, in this embodiment, corresponding to the unit incoming material volume, only one screen section 201-1 is used, and the material layer thickness is 120mm. The material passes through the screen surface for 3.2÷0.6=5.3s. The screening efficiency is 65%. Therefore, a large number of qualified pellets that could have entered the vertical furnace 800 cannot enter the subsequent vibrating screening assembly.

[0048] After adopting the method shown in the figure, two screen groups 201 are set, and each screen group 201 uses two screen parts 201-1. The incoming material volume of the fixed screen feed port 200a is 2000t / h, and the incoming material volume for a single screen group 201 is 1000t / h. And because each screen group 201 is provided with two screen parts 201-1, the length of the screen part 201-1 is twice the original, that is, 3.2×2=6.4m. This significantly increases the time for the material to pass through the screening surface and reduces the thickness of the material, thereby increasing the screening efficiency to 95%.

[0049] In the above-mentioned embodiment, a plurality of undersize material discharge channels 301 spaced apart from each other are provided in the housing 300 .

[0050] Taking the example shown in the figure for illustration, each screen group 201 forms two screen sections 201-1, an upper screen section 201-1 and a lower screen section 201-1, in the housing 300; a baffle plate 303 is provided in the housing 300, and the baffle plate 303 is provided between the two screen sections 201-1, and separates the falling space of the under-screen materials of the two screen sections 201-1. The upper side of the baffle plate 303 is used to abut against the edge of the tail of the upper screen section 201-1, so that the projection range of the upper screen section 201-1 in the height direction is located inside the projection range of the baffle plate 303, so that the under-screen materials of the upper screen section 201-1 are collected together.

[0051] Of course, more layers of screen parts 201 - 1 may be formed. When more layers of screen parts 201 - 1 are provided, the aforementioned undersize material discharge channel 301 may be provided in a sequentially nested manner in the above manner.

[0052] The baffle plate 303 is a conical structure, with its large diameter end connected to the upper screen portion 201-1 and its small diameter end connected to the fixed screen undersize outlet 200c. Optionally, in order to increase the structural strength of the baffle plate 303,

[0053] A plurality of undersize material discharge channels 301 are sequentially arranged from the inside to the outside, and are all connected to the fixed screen undersize material outlet 200c; each undersize material discharge channel 301 can be connected to the screen portion 201-1 located at the same level in the height direction. The undersize material discharge channels 301 that are sequentially arranged can collect multiple layers of undersize material, thereby simplifying the layout of the undersize material discharge channels 301.

[0054] In some other optional embodiments, a plurality of independent waste channels 302 are further provided in the housing 300, and the waste channels 302 penetrate the bottom plate of the housing 300 and extend to the outside of the bottom plate. The tail end of the bottommost screen portion 201-1 of each screen group 201 is connected to the waste channels 302 in a one-to-one correspondence. The waste channels 302 are connected to the bottommost screen portion 201-1 to collect the waste remaining on the last screen.

[0055] In the above embodiment, the housing 300 is connected with a cylindrical feed pipe 304, and the feed pipe 304 is connected with the fixed screen feed port 200a; a conical material stopper 304-1 is provided in the feed pipe 304, and in the height direction, the bottom of the cone is closer to the screen group 201 than the top of the cone, and a gap is provided between the side wall of the material stopper 304-1 and the tube wall of the feed pipe 304. By providing the conical material stopper 304-1, the gap between the material stopper 304-1 and the feed pipe 304 serves as a material drop channel, thereby realizing the operation of feeding several screen groups 201 at the same time.

[0056] Optionally, the head ends of the uppermost screen parts 201 - 1 of each screen group 201 abut against each other to form an angle area 202 , and the material blocking part 304 - 1 covers the angle area 202 in the height direction. In this way, the material can be prevented from falling into the angle area 202 .

[0057] As an optional method, the material blocking portion 304-1 can swing in the radial direction at a certain angle. The material blocking portion 304-1 can be rotatably connected to the side wall of the feed pipe 304, and the rotation refers to swinging in the horizontal direction toward the front, rear, left, and right directions.

[0058] The side wall of the feed pipe 304 is also provided with an annular baffle ring 304-2, which extends inward from the side wall; the material baffle portion 304-1 is located inside the annular baffle ring 304-2, and is spaced between the inner side wall of the annular baffle ring 304-2 and the side wall of the material baffle portion 304-1. Therefore, the material baffle portion 304-1 can adjust the material discharge amount of each screen group 201 by swinging at a certain angle.

[0059] In some other optional embodiments, each sieve portion 201-1 includes a sieve 203 and a sieve frame 204, the sieve frame 204 has an installation channel, the sieve 203 is slidably connected to the installation channel; the installation channel extends along the width direction of the sieve portion 201-1, and forms an installation port on the side of the sieve portion 201-1. A sealing door is provided at the installation port, and after the sieve 203 is inspected, the sealing door can form an airtight seal with the installation port.

[0060] This not only reduces the degradation of sealing performance and dust intrusion problems that may be caused by frequent opening and closing of the housing 300, but also significantly improves the safety and efficiency of maintenance work.

[0061] In other embodiments, the pellet feeding system further includes a dust removal component, which is provided with a dust removal port on the housing 300, and the dust removal port is located above the housing 300, so as to uniformly suck the dust in the housing 300. Optionally, a dust removal port is also provided at the fixed screen undersize outlet 200c, so as to further improve the dust removal effect.

[0062] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A pelletizing ore feeding system, characterized in that: It comprises a fixed screen assembly (200), a first vibrating screen assembly (400), a material storage assembly (500) and a second vibrating screen assembly (700); The fixed screen assembly (200) comprises a fixed screen feed inlet (200a), a fixed screen discharge inlet (200b) and a fixed screen undersize outlet (200c); the first vibrating screen assembly (400) comprises a first screen feed inlet (401) and a first screen undersize outlet (402); the second vibrating screen assembly (700) comprises a second screen feed inlet (701) and a second screen undersize outlet (702); The fixed screen feed port (200a) is used to communicate with the material source (100); the fixed screen undersize material outlet (200c) is connected to the first screen feed port (401), and the first screen undersize material outlet (402) is connected to the feed port of the material storage assembly (500); The material discharge port of the material storage assembly (500) is connected to the second screen feed port (701), and the second screen undersize material outlet (702) is used to be connected to the fuel inlet of the vertical furnace (800) to provide fuel for the vertical furnace (800).

2. The pelletizing ore feeding system according to claim 1, characterized in that: The fixed screen assembly (200) comprises a housing (300) and at least one screen group (201) located in the housing (300); the screen group (201) comprises a plurality of screen portions (201-1) arranged along the axial direction; the head ends and tail ends of two adjacent screen portions (201-1) are connected to each other.

3. The pelletizing ore feeding system according to claim 2, characterized in that: The two adjacent sieve parts (201-1) are defined as an upper sieve part and a lower sieve part, the head end of the upper sieve part is far away from the tail end of the lower sieve part in the height direction, and the tail end of the upper sieve part is close to the head end of the lower sieve part in the height direction.

4. The pelletizing ore feeding system according to claim 2, characterized in that: The housing (300) has a plurality of mutually spaced undersize material discharge channels (301), the plurality of undersize material discharge channels (301) being arranged in sequence from the inside to the outside and all being connected to the fixed screen undersize material outlet (200c); each of the undersize material discharge channels (301) can correspondingly receive undersize material from the screen portion (201-1) located at the same level in the height direction.

5. The pelletizing ore feeding system according to claim 2, characterized in that: A plurality of independent waste channels (302) are also provided in the housing (300), and the tail end of the screen portion (201-1) located at the bottom of each screen group (201) is connected to the waste channel (302) in a one-to-one correspondence.

6. The pelletizing ore feeding system according to claim 2, characterized in that: The housing (300) is connected to a feed pipe (304), and the feed pipe (304) is connected to the fixed screen feed port (200a); A conical material blocking portion (304-1) is provided in the feed pipe (304); in the height direction, compared with the top of the conical portion (304-1), the bottom of the conical portion is closer to the screen group (201); and a gap is provided between the side wall of the material blocking portion (304-1) and the tube wall of the feed pipe (304).

7. The pelletizing ore feeding system according to claim 6, characterized in that: The head ends of the screen parts (201-1) located at the uppermost side of each screen group (201) abut against each other to form an angled area (202), and the material blocking part (304-1) covers the angled area (202) in the height direction.

8. The pelletizing ore feeding system according to claim 6, characterized in that: The material blocking portion (304-1) can swing at a certain angle in the radial direction; The side wall of the feed pipe (304) is also provided with an annular retaining ring (304-2), the retaining portion (304-1) is located inside the annular retaining ring (304-2), and the interval is located between the annular retaining ring (304-2) and the retaining portion (304-1).

9. The pelletizing ore feeding system according to claim 2, characterized in that: The head end of one of the two adjacent screen parts (201-1) belonging to the same screen group (201) exceeds the tail end of the other screen part (201-1) in the horizontal direction.

10. The pelletizing ore feeding system according to any one of claims 2 to 9, characterized in that: Each of the sieve portions (201-1) comprises a sieve (203) and a sieve frame (204); the sieve frame (204) has a mounting channel, and the sieve (203) is slidably connected to the mounting channel; the mounting channel extends along the width direction of the sieve portion (201-1) and forms a mounting opening on the side of the sieve portion (201-1).

11. The pelletizing ore feeding system according to any one of claims 1 to 9, characterized in that: It comprises a material storage output pipeline (501), and the material outlet of the material storage component (500) is connected to the second screen material inlet (701) through the material storage output pipeline (501); It also includes a conveying part (600), wherein the conveying part (600) is used to transport the undersize of the second vibrating screen assembly (700) into the vertical furnace (800); It also includes a feeding sub-pipe (502), one end of which is connected to the material storage output pipeline (501), and the other end of which can be connected to the conveying part (600).

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