Multistage grading crushing protection device for blocky raw material of an electric arc furnace

Abstract

This invention relates to the field of crushing protection devices, and discloses a multi-stage crushing protection device for lumpy raw materials in a submerged arc furnace. The device includes a crusher body, two crushing rollers, and a feed hopper and discharge shell respectively installed at the feed inlet and discharge outlet of the crusher body. The invention features a protective plate inside the feed hopper and a rotating drum rotatably mounted on the side wall of the feed hopper. During the rotation of the crushing rollers, a reciprocating assembly drives a rotating shaft to reciprocate. The rotating shaft, through a conveying assembly, drives the rotating drum to reciprocate. The rotating drum, in turn, causes the protective plate to periodically oscillate within the feed hopper. When lumpy raw materials are poured into the feed hopper from top to bottom, most of the material first falls onto the oscillating protective plate, is buffered, and then slides into the gap between the crushing rollers for crushing. This significantly reduces the direct impact force of the lumpy material on the crushing rollers. When the protective plate becomes worn or damaged after long-term use, it can be quickly replaced by simply removing the connecting bolts.

Description

Technical Field

[0001] This invention relates to the field of crushing protection devices, specifically a multi-stage crushing protection device for lumpy raw materials in a submerged arc furnace. Background Technology

[0002] Submerged arc furnaces are core smelting equipment for producing bulk industrial raw materials such as ferroalloys, calcium carbide, and yellow phosphorus. During the smelting process in a submerged arc furnace, the particle size of the raw materials fed into the furnace is a key factor affecting the stability of the furnace conditions, energy consumption level, and product output. Compared with the original materials, the crushed materials can come into more full contact with the reducing gas, thereby accelerating the reduction reaction rate, improving the reduction efficiency, and reducing the metal content in the slag.

[0003] Currently, double-roll crushers are commonly used for crushing lumpy raw materials in electric arc furnaces. The basic structure of this equipment includes a frame, housing, feed hopper, crushing rollers, and drive unit. The surface of the crushing rollers is usually equipped with teeth to improve the gripping and crushing ability of the material. Its working principle is as follows: the drive unit drives the crushing rollers to rotate inward relative to each other. The material falls into the gap between the two rollers through the feed hopper and is crushed to the required particle size under the squeezing and shearing action of the roller surface, and then discharged from below.

[0004] However, the aforementioned double-roll crushers have the following technical defects in actual production applications. First, during the feeding process, lumpy raw materials are usually poured directly into the feed hopper. Large pieces of material fall directly under gravity and impact the surface of the crushing rollers. This long-term, high-intensity impact load easily leads to chipping or increased wear on the surface of the crushing rollers, severely shortening their service life. Second, as the core working component of the crusher, the crushing rollers are usually installed inside the frame. Disassembly and replacement require the removal of multiple peripheral components, making the disassembly and assembly process cumbersome. In addition, after a single-stage double-roll crusher crushes one stage, some lumpy raw materials may not be fully crushed before being discharged from the roller gap, resulting in uneven output particle size. Currently, some equipment adopts a staged crushing structure with multiple sets of crushing rollers arranged in series to crush materials step by step. However, in a multi-stage crushing structure, the difficulty of replacement and maintenance is further increased. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a multi-stage crushing and protection device for lumpy raw materials in a submerged arc furnace, aiming to solve technical problems such as large feed impact in existing crushing devices.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage crushing and protection device for lumpy raw materials in a submerged arc furnace, comprising a crusher body and two crushing rollers, respectively provided with a feed hopper and a discharge shell at the feed inlet and discharge outlet of the crusher body, a protection component provided in the feed inlet of the crusher body, an installation shell fixedly installed inside the crusher body, the upper end of the installation shell being fixedly connected to the feed hopper, the lower end of the installation shell (5) being connected to the crusher body, the crushing rollers being located inside the installation shell, the protection component including a protection plate rotatably installed inside the feed hopper, a rotating shaft rotatably installed on one side of the installation shell, a conveying component being provided at one end of the rotating shaft passing through the crusher body and the protection plate, a stirring component being installed on the part of the rotating shaft located inside the crusher body, the stirring component being used to recover large particles of raw material during operation, a reciprocating component being provided between one end of one crushing roller and the rotating shaft for controlling the rotation of the stirring component and the protection plate.

[0007] Preferably, the device further includes a motor fixedly mounted on the pulverizer body, the output end of which is fixedly fitted with a first pulley, one end of each of the two pulverizing rollers passing through the pulverizer body and fixedly fitted with rotating gears, the two rotating gears meshing with each other, one end of one of the pulverizing rollers being fixedly fitted with a second pulley, and a conveyor belt fitted between the first pulley and the second pulley.

[0008] Preferably, the reciprocating assembly includes a gear ring fixedly sleeved on the rotating shaft, a rack slidably disposed on one side of the mounting housing that meshes with the gear ring, one end of one of the crushing rollers being fixedly connected to a missing gear through the mounting housing, a rectangular frame slidably disposed on one side of the mounting housing and fixedly connected to the rack, and multiple saw teeth meshing with the missing gear being fixedly installed on both inner sides of the rectangular frame.

[0009] Preferably, the protective assembly further includes a rotating drum rotatably connected to the feed funnel, with a bolt passing through one end of the rotating drum, and threaded holes for threaded connection with the bolt are provided on both sides of the protective plate.

[0010] Preferably, the conveying assembly includes a first toothed pulley fixedly sleeved on a rotating shaft and a second toothed pulley fixedly sleeved on one of the rotating drums, with a matching conveying toothed belt sleeved between the first toothed pulley and the second toothed pulley, and a connecting housing for protecting the first toothed pulley, the second toothed pulley and the conveying toothed belt is provided on the outside of the crusher body.

[0011] Preferably, a protective housing is fixedly installed on one side of the mounting housing, and the toothed ring, rack, missing gear, rectangular frame and sawtooth are all located inside the protective housing, and the rotating shaft is rotatably connected to the protective housing.

[0012] Preferably, the stirring assembly includes a connecting plate fixedly sleeved on the rotating shaft, a perforated plate fixedly installed on one side of the connecting plate, and an arc-shaped screening plate fixedly installed inside the discharge port of the crusher body.

[0013] Preferably, the diameter of the missing gear is larger than the diameter of the gear ring, and openings are provided on both sides of the mounting housing.

[0014] Preferably, a fixed housing is fixedly installed on the outside of the crusher body to protect the rotating gears.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. To effectively buffer the direct impact of large materials on the crushing roller during the feeding process, and to prevent the crushing roller from chipping teeth or premature wear due to long-term heavy-load impact, thereby extending the service life of the crushing roller and reducing the frequency of equipment maintenance, this invention sets up a protective plate inside the feeding hopper and rotates a drum on the side wall of the feeding hopper. The drum and the protective plate are detachably connected by bolts. During the rotation of the crushing roller, the reciprocating assembly drives the rotating shaft to rotate back and forth. The rotating shaft drives the drum to rotate back and forth through the conveying assembly. The drum then drives the protective plate to periodically oscillate back and forth inside the feeding hopper. When the blocky raw material is poured into the feeding hopper from top to bottom, most of the material first falls on the oscillating protective plate, and after being buffered, slides into the gap of the crushing roller for crushing. This greatly reduces the direct impact force of the blocky material on the crushing roller. When the protective plate is worn or damaged after long-term use, it can be quickly replaced by simply removing the connecting bolts.

[0016] 2. To simultaneously separate qualified and unqualified materials during the crushing process and prevent the accumulation of incompletely crushed lumpy raw materials from hindering the smooth discharge of qualified materials, this invention has a connecting plate fixedly sleeved on the rotating shaft and a perforated plate fixedly installed on one side of the connecting plate. At the same time, an arc-shaped screening plate is fixedly installed inside the discharge port of the crusher body. The arc-shaped screening plate can retain incompletely crushed lumpy raw materials on its upper surface, while the material crushed to the qualified particle size will leak out through the screen holes. After being crushed by the crushing roller 4, some qualified particles and unqualified particles accumulate together on the surface of the arc-shaped screening plate. During the operation of the crushing roller, the reciprocating assembly drives the rotating shaft to rotate back and forth. The rotating shaft drives the perforated plate to swing back and forth within the crusher body through the connecting plate. During the reciprocating swing, the perforated plate periodically disperses and turns the material accumulated on the arc-shaped screening plate, so that the material crushed to the qualified particle size can be quickly separated from the material pile and fall through the screen holes.

[0017] 3. To actively push the incompletely crushed raw materials intercepted by the arc-shaped screening plate to the crushing roller area for further crushing, thus achieving automatic recycling and crushing of substandard materials, this invention has openings on both sides of the mounting housing. During the operation of the crushing roller, the gear, rectangular frame, and saw teeth work together to drive the rack to move back and forth. The rack then drives the gear ring to rotate back and forth. When the gear completes one rotation, it can drive the gear ring to rotate a full round trip. That is, the control plate swings back and forth within the crusher body for a full stroke, causing it to move from one of the openings... The plate swings from one opening to the other, then swings back to its original position. The diameter of the missing gear is set to be larger than the diameter of the gear ring on the rotating shaft, so that when the orifice plate is on the opening side, the orifice plate is in an inclined state. The raw material that is not completely crushed on the orifice plate slides along the surface of the orifice plate to the opening under gravity, and then falls back to the crushing roller area through the opening for further crushing. With this setting, through the diameter difference between the missing gear and the gear ring and the reciprocating transmission, the orifice plate forms a sufficient pushing angle at the end of the swing stroke, which directs the substandard material back to the crushing roller area, realizing the automatic circulation and re-crushing of the uncrushed material. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall frontal three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the overall rear-view three-dimensional structure of the present invention; Figure 3 This is a schematic diagram of the overall frontal three-dimensional cross-sectional structure of the present invention; Figure 4 This is a schematic diagram of the overall rear-view three-dimensional cross-sectional structure of the present invention; Figure 5 for Figure 4 A magnified structural diagram of A in the middle; Figure 6 This is a schematic diagram of the connection structure between the reciprocating component and the stirring component of the present invention; Figure 7 This is a partial three-dimensional cross-sectional structural diagram of the protective component of the present invention.

[0019] In the diagram: 1. Crusher body; 2. Feed hopper; 3. Discharge shell; 4. Crushing roller; 5. Mounting shell; 6. Opening; 7. Protective plate; 8. Arc-shaped screening plate; 9. Perforated plate; 10. Connecting shell; 11. Connecting plate; 12. Protective shell; 13. Rotating drum; 14. Rotating shaft; 15. First toothed pulley; 16. Bolt; 17. Second toothed pulley; 18. Rectangular frame; 19. Missing gear; 20. Rack; 21. Toothed ring; 22. Sawtooth; 23. Threaded hole; 24. Conveyor belt; 25. Second pulley; 26. Conveyor belt; 27. First pulley; 28. Motor; 29. ​​Fixed shell; 30. Rotating gear. Detailed Implementation

[0020] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0021] Please see Figures 1-7 A multi-stage crushing and protection device for lumpy raw materials in a submerged arc furnace includes a crusher body 1, two crushing rollers 4, a feed hopper 2 and a discharge shell 3 respectively installed at the feed inlet and discharge outlet of the crusher body 1, a motor 28 fixedly mounted on the crusher body 1, a first pulley 27 fixedly sleeved at the output end of the motor 28, one end of each of the two crushing rollers 4 penetrating the crusher body 1 and fixedly sleeved with a rotating gear 30, the two rotating gears 30 meshing with each other, and a second pulley 25 fixedly sleeved at one end of one of the crushing rollers 4, the first pulley 27 and the second pulley 25 being connected. A conveyor belt 26 is fitted on the machine (multiple belt placement grooves are opened on both the first pulley 27 and the second pulley 25 to hold multiple belts). The above structure is the prior art. The working principle of the crusher is well known to those skilled in the art and will not be described in detail here. A fixed housing 29 for protecting the rotating gear 30 is fixedly installed on the outside of the crusher body 1 (fixed by screws or other means for easy disassembly. The shape of the fixed housing 29 in this article is not limited. Different shapes of fixed housing 29 can be used to protect the first pulley 27, the second pulley 25 and the conveyor belt 26). A protective assembly is installed inside the feed inlet of the crusher body 1. A mounting housing 5 is fixedly installed inside the crusher body 1. The upper end of the mounting housing 5 is fixedly connected to the feed hopper 2, and the lower end of the mounting housing 5 is connected to the crusher body 1 (dividing the crusher body 1 into two chambers, one for crushing and one for screening). The crushing roller 4 is located inside the mounting housing 5 (the crushing roller 4 is rotatably connected to the mounting housing 5). The protective assembly includes a protective plate 7 rotatably installed inside the feed hopper 2, and also includes a rotating drum 13 rotatably connected to the feed hopper 2. A bolt 16 is inserted through one end of the rotating drum 13, and the two ends of the protective plate 7... Each side is provided with threaded holes 23 for threaded connection with bolts 16. A rotating shaft 14 is rotatably mounted on one side of the housing 5. One end of the rotating shaft 14 passes through the space between the crusher body 1 and the protective plate 7 and is equipped with a conveying component. The part of the rotating shaft 14 located inside the crusher body 1 is equipped with a stirring component, which is also used to recover large particles of raw materials during operation. One end of the crushing roller 4 is connected to the rotating shaft 14 with a reciprocating component, which is used to control the rotation of the stirring component and the protective plate 7. When the motor 28 is started, the crushing roller 4 is rotated to perform the crushing operation. During the crushing operation, the reciprocating component drives the rotating shaft 14 to rotate back and forth. The rotating shaft 14 passes through... The conveying assembly drives the rotating drum 13 to reciprocate (the conveying assembly includes a first toothed pulley 15 fixedly sleeved on the rotating shaft 14 and a second toothed pulley 17 fixedly sleeved on one of the rotating drums 13; a matching conveying toothed belt 24 is sleeved between the first toothed pulley 15 and the second toothed pulley 17; a connecting housing 10 for protecting the first toothed pulley 15, the second toothed pulley 17 and the conveying toothed belt 24 is provided on the outside of the crusher body 1; the connecting housing 10 is connected to the crusher body 1 by a detachable fixing method such as screws). The rotating drum 13 then drives the protective plate 7 to periodically reciprocate within the feed hopper 2. When lumpy raw materials are poured into the feed hopper 2 from top to bottom, most of the material first falls onto the swinging protective plate 7, and after being buffered, slides into the gap of the crushing roller 4 for crushing. This greatly reduces the direct impact of lumpy materials on the crushing roller 4. When the protective plate 7 is worn or damaged after long-term use, it can be removed by simply unscrewing the bolts 16 for quick replacement. This effectively buffers the direct impact of large pieces of material on the crushing roller 4 during the feeding process, preventing the crushing roller 4 from chipping teeth or wearing out prematurely due to long-term heavy-load impact, thereby extending the service life of the crushing roller 4 and reducing the frequency of equipment maintenance.

[0022] As a further technical solution of the present invention, the stirring assembly includes a connecting plate 11 fixedly sleeved on the rotating shaft 14, a perforated plate 9 fixedly installed on one side of the connecting plate 11, and an arc-shaped screening plate 8 fixedly installed inside the discharge port of the crusher body 1. The arc-shaped screening plate 8 can retain the incompletely crushed lumpy raw materials on its upper surface, while the material that has been crushed to the qualified particle size will leak out through the screen holes. After being crushed by the crushing roller, some qualified particles and unqualified particles accumulate together on the surface of the arc-shaped screening plate 8. The motor 28 is started to control the crushing roller 4 to rotate and carry out the crushing operation. During the process, the reciprocating assembly drives the rotating shaft 14 to rotate back and forth, the rotating shaft 14 drives the connecting plate 11 to swing back and forth, and the connecting plate 11 drives the perforated plate 9 to swing back and forth within the crusher body 1. During the reciprocating swing, the perforated plate 9 periodically disperses and turns the material accumulated on the arc-shaped screen plate 8, so that the material that has been crushed to the qualified particle size can be quickly separated from the material pile and fall through the screen holes. In the crushing process, the qualified material and the unqualified material are separated in real time, avoiding the accumulation of incompletely crushed lumpy raw materials and hindering the smooth discharge of qualified material.

[0023] As a further technical solution of the present invention, the reciprocating assembly includes a gear ring 21 fixedly sleeved on the rotating shaft 14, a rack 20 slidably disposed on one side of the mounting housing 5 and meshing with the gear ring 21, one end of a crushing roller 4 passing through the mounting housing 5 and fixedly connected to a missing gear 19, a rectangular frame 18 slidably disposed on one side of the mounting housing 5 and fixedly connected to the rack 20, multiple saw teeth 22 meshing with the missing gear 19 are fixedly installed on both inner sides of the rectangular frame 18, a protective housing 12 is fixedly installed on one side of the mounting housing 5, and the gear ring 21 and the rack 20 are also included. The rack 20, missing gear 19, rectangular frame 18, and sawtooth 22 are all located inside the protective housing 12. The rotating shaft 14 is rotatably connected to the protective housing 12 (the protective housing 12 is connected to the mounting housing 5 by a detachable fixing method such as screws). Openings 6 are provided on both sides of the mounting housing 5. When the motor 28 is started, the crushing roller 4 is rotated to perform the crushing operation. During this process, one of the crushing rollers 4 drives the missing gear 19 to rotate. The missing gear 19, in conjunction with the rectangular frame 18 and sawtooth 22, drives the rack 20 to reciprocate. The toothed ring 21 reciprocates, and the toothed ring 21 drives the rotating shaft 14 to reciprocate. When the missing gear 19 completes one revolution, it can drive the toothed ring 21 to reciprocate a complete round trip, that is, control the orifice plate 9 to swing back and forth within the crusher body 1 for a complete stroke, so that it swings from one side of one opening 6 to the other side of the opening 6, and then swings back to its original position. The diameter of the missing gear 19 is set to be larger than the diameter of the toothed ring 21 (so that when the orifice plate 9 is on one side of the opening 6, the orifice plate 9 is in an inclined state, and the second toothed pulley...). The diameter of 17 is larger than the diameter of the first toothed pulley 15, so that the arc of the swing of the perforated plate 9 driven by the rotating shaft 14 is greater than the arc of the swing of the protective plate 7. When the perforated plate 9 is located on one side of the opening 6, the raw material that is not completely crushed on it slides along the surface of the perforated plate 9 to the opening 6 under the action of gravity, and falls back to the crushing roller 4 area through the opening 6. It is then crushed again by the crushing roller 4. The raw material that is not completely crushed and intercepted by the arc-shaped screen plate 8 is actively pushed to the crushing roller 4 area for further crushing, so as to realize the automatic circulation crushing of substandard materials.

[0024] During work: I. Equipment Start-up and Power Transmission Stage Step 1: Start motor 28 to drive crushing roller 4 to rotate. The operator starts the motor 28, and the output shaft of the motor 28 drives the first pulley 27 to rotate, which in turn drives the second pulley 25 to rotate via the conveyor belt 26, thereby driving one of the crushing rollers 4 to rotate. This crushing roller 4 drives the other crushing roller 4 to rotate inward relative to it via the meshing rotating gear 30. Step 2: The power of the crushing roller 4 is synchronously transmitted to the reciprocating assembly. The rotating crushing roller 4 drives the missing gear 19 at its end to rotate synchronously. The missing gear 19 intermittently meshes with the serration 22 on the inner side of the rectangular frame 18, driving the rectangular frame 18 to move back and forth. The rectangular frame 18 drives the rack 20 to move back and forth, and the rack 20 in turn drives the toothed ring 21 fixedly sleeved on the rotating shaft 14 to rotate back and forth, converting the continuous rotation of the crushing roller 4 into the reciprocating rotation of the rotating shaft 14, without the need for an additional independent drive source. II. Feeding Buffer and Protection Stage Step 3: The rotating shaft 14 drives the protective plate 7 to swing back and forth. The rotating shaft 14 reciprocates, driving the first toothed pulley 15 on it to rotate synchronously. The second toothed pulley 17 is driven to rotate through the transmission toothed belt 24, which in turn drives the rotating drum 13 and the protective plate 7 connected to it by bolts 16 to oscillate periodically in the feed hopper 2. When the blocky raw material is poured into the feed hopper 2 from top to bottom, most of the material first falls on the oscillating protective plate 7, and after being buffered, it slides into the gap of the crushing roller 4. This greatly reduces the direct impact force of the blocky material on the crushing roller 4, and effectively avoids the crushing roller 4 from being damaged by long-term heavy impact or premature wear. Step 4: Quick Replacement of Protective Plate 7 When the protective plate 7 becomes worn or damaged after long-term use, it is only necessary to remove the bolt 16 to remove the protective plate 7 from the rotating drum 13 without removing other external parts; III. Crushing and Screening Stage Step 5: The material enters the crushing zone for crushing. After being buffered by the protective plate 7, the blocky raw material falls between the two crushing rollers 4 inside the mounting housing 5 and is crushed under the squeezing and shearing action of the relatively rotating roller surfaces; Step 6: The perforated plate 9 reciprocates to disperse and screen the material. The reciprocating rotation of the shaft 14 synchronously drives the connecting plate 11 and the perforated plate 9 to swing back and forth inside the crusher body 1. After being crushed by the crushing roller 4, the material falls onto the arc-shaped screen plate 8. Qualified particles fall through the screen holes and are discharged from the discharge shell 3. Unqualified particles are trapped on the surface of the arc-shaped screen plate 8. During the reciprocating swing, the perforated plate 9 periodically disperses and turns the material accumulated on the arc-shaped screen plate 8, so that the material that has been crushed to the qualified particle size can be quickly separated from the material pile and fall through the screen holes, avoiding the accumulation and blockage of unqualified materials and improving the screening efficiency. IV. Automatic Re-crushing Stage for Substandard Materials Step 7: The perforated plate 9 pushes the substandard material back to the crushing roller 4. Since the diameter of the missing gear 19 is larger than the diameter of the toothed ring 21, and the mounting housing 5 has openings 6 on both sides, when the missing gear 19 rotates once to complete one reciprocating motion cycle, the toothed ring 21 drives the perforated plate 9 to swing back and forth for a complete stroke, so that it swings from one side of one opening 6 to the other side of the opening 6 and then returns to its original position. When the perforated plate 9 is located on one side of the opening 6, the perforated plate 9 is in an inclined state, and the raw material that is not completely crushed and trapped on it slides along the surface of the perforated plate 9 to the opening 6 under the action of gravity, and falls back to the crushing roller 4 area through the opening 6, realizing the automatic recycling and re-crushing of substandard materials.

[0025] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the claims of the present invention.

Claims

1. A multi-stage crushing and protection device for lumpy raw materials in a submerged arc furnace, comprising a crusher body (1), two crushing rollers (4), and feed hoppers (2) and discharge shells (3) respectively installed at the feed inlet and discharge outlet of the crusher body (1), characterized in that, A protective component is provided in the feed inlet of the crusher body (1). An installation housing (5) is fixedly installed inside the crusher body (1). The upper end of the installation housing (5) is fixedly connected to the feed hopper (2). The lower end of the installation housing (5) is connected to the crusher body (1). The crushing roller (4) is located inside the installation housing (5). The protective component includes a protective plate (7) rotatably installed inside the feed hopper (2). A rotating shaft (14) is rotatably installed on one side of the installation housing (5). A conveying component is provided between the crusher body (1) and the protective plate (7) at one end of the rotating shaft (14). A stirring component is installed in the part of the rotating shaft (14) inside the crusher body (1). The stirring component is also used to recover large particles of raw materials when it is working. A reciprocating component is provided between one end of the crushing roller (4) and the rotating shaft (14) to control the rotation of the stirring component and the protective plate (7).

2. The multi-stage crushing and protection device for lumpy raw materials in a submerged arc furnace according to claim 1, characterized in that, It also includes a motor (28) fixedly installed on the crusher body (1), the output end of the motor (28) is fixedly fitted with a first pulley (27), one end of each of the two crushing rollers (4) passes through the crusher body (1) and is fixedly fitted with a rotating gear (30), the two rotating gears (30) mesh with each other, one end of one of the crushing rollers (4) is also fixedly fitted with a second pulley (25), and a conveyor belt (26) is fitted between the first pulley (27) and the second pulley (25).

3. The multi-stage crushing and protection device for lumpy raw materials in a submerged arc furnace according to claim 2, characterized in that, The reciprocating assembly includes a gear ring (21) fixedly sleeved on the rotating shaft (14), a rack (20) slidably disposed on one side of the mounting housing (5) and meshing with the gear ring (21), one end of the crushing roller (4) passing through the mounting housing (5) and fixedly connected with a missing gear (19), a rectangular frame (18) slidably disposed on one side of the mounting housing (5) and fixedly connected with the rack (20), and multiple saw teeth (22) meshing with the missing gear (19) are fixedly installed on both inner sides of the rectangular frame (18).

4. The multi-stage crushing and protection device for lumpy raw materials in a submerged arc furnace according to claim 3, characterized in that, The protective assembly also includes a rotating drum (13) that is rotatably connected to the feed hopper (2). A bolt (16) is provided through one end of the rotating drum (13), and threaded holes (23) that are threadedly connected to the bolt (16) are provided on both sides of the protective plate (7).

5. The multi-stage crushing and protection device for lumpy raw materials in a submerged arc furnace according to claim 4, characterized in that, The conveying assembly includes a first toothed pulley (15) fixedly mounted on a rotating shaft (14) and a second toothed pulley (17) fixedly mounted on one of the rotating drums (13). A matching conveying toothed belt (24) is provided between the first toothed pulley (15) and the second toothed pulley (17). A connecting housing (10) for protecting the first toothed pulley (15), the second toothed pulley (17) and the conveying toothed belt (24) is provided on the outside of the crusher body (1).

6. The multi-stage crushing and protection device for lumpy raw materials in a submerged arc furnace according to claim 5, characterized in that, A protective housing (12) is fixedly installed on one side of the mounting housing (5). The toothed ring (21), rack (20), missing gear (19), rectangular frame (18) and sawtooth (22) are all located inside the protective housing (12). The rotating shaft (14) is rotatably connected to the protective housing (12).

7. The multi-stage crushing and protection device for lumpy raw materials in a submerged arc furnace according to claim 6, characterized in that, The stirring assembly includes a connecting plate (11) fixedly sleeved on the rotating shaft (14), a perforated plate (9) fixedly installed on one side of the connecting plate (11), and an arc-shaped screening plate (8) fixedly installed in the discharge port of the crusher body (1).

8. The multi-stage crushing and protection device for lumpy raw materials in a submerged arc furnace according to claim 7, characterized in that, The diameter of the missing gear (19) is larger than the diameter of the gear ring (21), and openings (6) are provided on both sides of the mounting housing (5).

9. A multi-stage crushing and protection device for lumpy raw materials in a submerged arc furnace according to claim 8, characterized in that, The outside of the crusher body (1) is fixedly installed a fixed housing (29) to protect the rotating gear (30).

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