High-speed steel standby intermediate frequency furnace capable of reducing inclusions and preparation process

Abstract

The invention relates to the technical field of intermediate frequency furnaces, and discloses a high-speed steel standby intermediate frequency furnace capable of reducing inclusions and a preparation technology.The high-speed steel standby intermediate frequency furnace capable of reducing the inclusions comprises a shell and further comprises a furnace body arranged in the shell, and when an expansion piece completely shrinks, the upper portion of a material conveying piece does not communicate with a material distributing piece; when the expansion piece completely extends, the upper portion of the conveying piece is communicated with the material distributing piece, and the material distributing piece is not communicated with the material guiding disc. The material leakage disc is driven by the expansion piece to rotate forwards and backwards and matched with the triangular inclined block of the material conveying piece to achieve classified temporary storage of materials, meanwhile, the material leakage groove opening of the material guide disc is in butt joint with the material leakage through groove, the materials are guided to be discharged without residues, the content of high-speed steel inclusions is reduced, the materials are evenly distributed through the material guide piece, no accumulation area exists in the furnace, and heat transfer is even. Reworking caused by out-of-control temperature is reduced, maintenance cost and production risks are reduced, gaps between coarse particles are prevented from being filled with fine particles, and stable slagging components are ensured.

Description

Technical Field

[0001] This invention relates to the technical field of medium-frequency furnaces, and more particularly to a medium-frequency furnace and process for preparing high-speed steel that can reduce inclusions. Background Technology

[0002] An intermediate frequency furnace is a power supply device that converts 50Hz AC power into intermediate frequency (150Hz and above to 20kHz). Its working process is based on the principle of electromagnetic induction. The main circuit adopts AC, DC and AC commutation to efficiently heat and melt metal.

[0003] However, in existing technologies, blocky alloy materials (such as ferrotungsten and ferromolybdenum) tend to pile up locally at the bottom of the furnace, failing to fall into the high-temperature zone, which violates the regulations for placing refractory materials in the high-temperature zone. Powdered materials (such as aluminum powder and Si-Ca powder) tend to accumulate locally on the slag surface, failing to uniformly cover the material for effective diffusion and deoxidation. Furthermore, when materials of different particle sizes (such as lime 40-80mm and fluorite 40-60mm) are mixed and poured, fine particles easily fill the gaps between coarse particles, disrupting the slag ratio (lime:fluorite = 65~75:35~25), resulting in uneven slag composition. During the heating and melting process, from the perspective of inclusion control and quality requirements, the accumulation of slag-forming materials prevents the slag from uniformly covering the molten steel. At the same time, it causes the oxygen content in some areas of the molten steel to remain unremoved, generating oxide inclusions such as FeO and SiO2. Sulfur cannot fully react with CaO, resulting in FeS sulfur. Excessive inclusions and direct dumping of materials can disrupt the furnace temperature field, making temperature measurements inaccurate and potentially leading to substandard tapping temperatures. Furthermore, melting the piled material requires extended heating time and increased power, increasing energy consumption and potentially causing alloying elements to volatilize, ultimately impacting production efficiency and cost control. Direct dumping also disrupts temperature control, resulting in poor thermal conductivity within the pile, leading to "external heat and internal cold." This prolongs the melting cycle of refractory materials (such as W and Mo alloys) and may even leave unmelted particles. Meanwhile, the large surface area of ​​unpiled material causes rapid temperature increases, potentially oxidizing and burning off deoxidizers (such as aluminum powder), reducing deoxidation efficiency and generating Al2O3 inclusions. Localized overheating can also affect equipment lifespan, ultimately impacting tapping temperature and quality. Summary of the Invention

[0004] The purpose of this invention is to provide a medium-frequency furnace and preparation process for high-speed steel preparation that can reduce inclusions, and to solve the problem of uneven heating and difficulty in melting metal materials during the melting process.

[0005] This invention provides, in one aspect, a medium-frequency furnace for preparing high-speed steel with reduced inclusions, comprising an outer shell, a furnace body disposed inside the outer shell, a telescopic device sleeved on the top of the furnace body, a conveying component sleeved on the top of the furnace body, a distributing component rotatably connected inside the conveying component, a guide plate fixedly connected to the bottom of the distributing component, a guide component rotatably connected to the guide plate, and a one-way transmission component connecting the distributing component and the guide component. The distributing component is located above the guide plate, and the guide component is located below the guide plate. The distributing component is connected to the output end of the telescopic device, and the distributing component is in contact with the guide plate. The guide plate is in communication with the interior of the furnace body. When the telescopic device is fully retracted, the top of the conveying component is not in communication with the distributing component, and the distributing component is in communication with the guide plate. When the telescopic device is fully extended, the top of the conveying component is in communication with the distributing component, and the distributing component is not in communication with the guide plate.

[0006] Furthermore, the material distribution component includes a material leakage disc rotatably connected inside the material conveying component, a connecting rod fixedly connected at one end to the outside of the material leakage disc, and a round shaft fixedly connected below the other end of the connecting rod. The material leakage disc is provided with multiple material leakage grooves at equal angles. The output end of the telescopic device is fixedly connected to a transverse groove sleeve, and the round shaft is located inside the transverse groove sleeve.

[0007] Furthermore, the material conveying component includes a sleeve fitted on top of the outer shell, multiple triangular inclined blocks arranged at equal angles and fixedly connected inside the sleeve, an outer pull sleeve fixedly connected to the outside of the sleeve, and two positioning sleeves provided and fixedly connected to the outside of the sleeve. The positioning sleeves are symmetrical about the central axis of the sleeve, and the sleeve has a straight groove.

[0008] Furthermore, the connecting rod passes through the straight groove. When the telescopic device is fully retracted, the connecting rod is in contact with the inner wall on one side of the straight groove. The angle between the connecting rod and the inner wall on the other side of the straight groove is half the angle of the multiple material leakage channels.

[0009] Furthermore, the guide plate has multiple slots at equal angles, and a circular groove is formed in the middle of the guide plate, with the one-way transmission component located inside the circular groove.

[0010] Furthermore, the guide component is composed of multiple triangular inclined plates arranged at equal angles. The number of triangular inclined blocks, material leakage channels, triangular inclined plates and leakage channels are equal. The triangular inclined blocks and triangular inclined plates have the same shape as the material leakage channels. The tops and sides of the triangular inclined blocks and triangular inclined plates are inclined downwards.

[0011] Furthermore, the unidirectional transmission component includes a sleeve plate connected to the top of the guide component, multiple spring claws arranged at equal angles and disposed inside the sleeve plate, a connecting plate fixedly connected to the bottom of the discharge plate, and a ratchet fixedly connected to the bottom of the connecting plate, wherein the ratchet is located inside the sleeve plate.

[0012] Furthermore, the sleeve disc, connecting disc, and circular groove are concentric, the sleeve disc passes through the circular groove and is fixedly connected to the guide component, and the pawl is engaged with the spring pawl.

[0013] Furthermore, the top of the outer casing is provided with two limiting rods, and the positioning sleeve is sleeved on the outside of the limiting rods.

[0014] On the other hand, a high-speed steel preparation process that can reduce inclusions was proposed, which uses an intermediate frequency furnace for high-speed steel preparation that can reduce inclusions, including the following steps: Step 1: Prepare the materials and pre-treat them. Mix the materials according to the mass ratio, control the purity and particle size, and avoid introducing impurities.

[0015] Step 2: Place the raw material above the conveyor, and use the expansion joint to control the distribution unit to allow the raw material to be intermittently and quickly dispersed and fed in batches. Add other raw materials in sequence, and place the replenishing material above the conveyor for rapid replenishment. Add slag-forming agent to control slag, then remove the conveyor, stir and tap the steel to complete the initial preparation of molten steel.

[0016] Step 3: The molten steel is heated in the LF furnace, and its composition is analyzed and fine-tuned. Refining slag is added to optimize the slag. Electrode heating and argon blowing are used to promote the reaction and adsorb inclusions, thereby improving the purity and composition accuracy of the molten steel.

[0017] The beneficial effects of this invention are: The material discharge disc is driven to rotate forward and backward by an expansion joint, and works in conjunction with the triangular inclined block of the conveying component to achieve material classification and temporary storage. At the same time, the discharge slot of the guide disc connects with the material discharge channel to guide the material to fall without residue. The triangular inclined disc of the guide component rotates intermittently through a one-way transmission component, causing the material to be divided and fall onto the inner wall and dispersed, reducing the content of inclusions in high-speed steel. The material is evenly distributed by the guide component, with no accumulation area in the furnace, and the heat transfer is uniform, reducing rework caused by temperature runaway, lowering maintenance costs and production risks, avoiding fine particles filling the gaps between coarse particles, and ensuring the stability of slag composition.

[0018] The triangular swashplate of the guide plate rotates intermittently to evenly distribute the material to the inner wall and center of the furnace, eliminating local accumulation areas and ensuring uniform heat transfer. This improves the stability of the temperature field, ensuring that the temperature measurement data accurately reflects the temperature of the molten steel and reduces the deviation of the tapping temperature. At the same time, when the expansion joint is fully retracted, the connecting rod fits against the inner wall of the straight groove, avoiding local temperature anomalies caused by material distribution deviation and further reducing the rework rate.

[0019] The triangular inclined plate of the guide component can directly guide the blocky refractory material to the high-temperature zone at the bottom of the furnace, shortening the melting cycle without additional heating and reducing energy consumption per unit capacity. The uniform material distribution design avoids local overheating, reducing the volatilization of alloying elements. In addition, the residue-free structure of the guide plate and guide component can reduce the oxidation and burn-off rate of deoxidizer. Furthermore, the telescopic device drives the horizontal groove sleeve, round shaft and connecting rod, which can quickly drive the material tray to switch between temporary storage and lowering states. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of an intermediate frequency furnace from a first-person perspective. Figure 2 This is a schematic diagram of a partial structure of an intermediate frequency furnace; Figure 3 This is a structural schematic diagram of the material distribution component of an intermediate frequency furnace; Figure 4 medium frequency furnace Figure 1 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the material conveying components of an intermediate frequency furnace; Figure 6 This is a schematic diagram of the material leakage tray of an intermediate frequency furnace; Figure 7 This is a schematic diagram of the material guide component of an intermediate frequency furnace; Figure 8 This is a schematic diagram of the unidirectional transmission component of an intermediate frequency furnace.

[0021] In the picture: 1. Outer shell; 101. Limiting rod; 2. Furnace body; 3. Expansion joint; 31. Horizontal groove sleeve; 4. Conveying component; 41. Shell; 411. Straight groove opening; 42. Triangular inclined block; 43. Outer pull sleeve; 44. Positioning sleeve; 5. Material distribution component; 51. Discharge disc; 511. Discharge channel; 52. Connecting rod; 53. Round shaft; 6. Guide disc; 61. Discharge groove opening; 62. Round groove; 7. Guide component; 71. Triangular inclined disc; 8. One-way transmission component; 81. Sleeve disc; 82. Spring claw; 83. Connecting disc; 84. Racket. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Example 1, refer to Figures 1-8This invention provides a first embodiment of a medium-frequency furnace for preparing high-speed steel with reduced inclusions. The furnace includes an outer shell 1, a furnace body 2 disposed inside the outer shell 1, a telescopic device 3 sleeved on the top of the furnace body 2, a material conveying component 4 sleeved above the furnace body 2, a material distribution component 5 rotatably connected inside the material conveying component 4, a guide plate 6 fixedly connected to the bottom of the material distribution component 5, a guide component 7 rotatably connected to the guide plate 6, and a one-way transmission component 8 connecting the material distribution component 5 and the guide component 7. The material distribution component 5... Located above the guide plate 6, the guide component 7 is located below the guide plate 6. The material distribution component 5 is connected to the output end of the telescopic device 3. The material distribution component 5 is in contact with the guide plate 6. The guide plate 6 is in communication with the interior of the furnace body 2. When the telescopic device 3 is fully retracted, the upper part of the conveying component 4 is not in communication with the material distribution component 5, and the material distribution component 5 is in communication with the guide plate 6. When the telescopic device 3 is fully extended, the upper part of the conveying component 4 is in communication with the material distribution component 5, and the material distribution component 5 is not in communication with the guide plate 6.

[0024] Specifically, the rotation of the material distribution component 5 is controlled by the telescopic device 3. When rotating forward, the feeding channel of the material distribution component 5 is aligned with the feeding port of the conveying component 4. When rotating in reverse, the bottom discharge channel is aligned with the guide hole of the guide plate 6. At the same time, the rotation speed can be adjusted by the external drive component to distribute the material conveyed by the conveying component 4 to each feeding channel, avoiding local accumulation of single material. The guide plate 6 is horizontally fixed above the inside of the furnace body 2 and communicates with the inside of the furnace body 2. The guide component 7 can rotate synchronously with the forward rotation of the material distribution component 5 through the one-way transmission component 8, guiding the material falling from the guide plate 6 along the furnace. The material is evenly distributed in the circumferential direction of body 2. When it is necessary to add material into the furnace, the expansion joint 3 fully extends, causing the material distribution component 5 to rotate. Various materials enter the independent space of the material distribution component 5 from above the conveying component 4 for temporary storage. Then the expansion joint 3 fully retracts, causing the material distribution component 5 to distribute the material during forward rotation. The material temporarily stored in the material distribution component 5 will pass through the guide plate 6 and then be intermittently dispersed with the guide component 7 to avoid local stacking. The powdery material is evenly covered on the slag surface to achieve full diffusion and deoxidation. The slag material of different particle sizes is evenly distributed to ensure consistent slag composition.

[0025] The outer shell 1 serves as the external protection and support structure of the equipment, with the furnace body 2 fixedly installed inside. The furnace body 2 provides a sealed, high-temperature resistant reaction space for high-speed steel smelting. Its inner wall is made of high-temperature resistant refractory material to ensure stable temperature and no heat loss during the smelting process. The telescopic device 3 is installed on the top of the furnace body 2 by screws during use. The telescopic action triggers the forward and reverse rotation of the material distribution component 5. When the telescopic device 3 extends, it drives the material distribution component 5 to rotate forward, and when it retracts, it drives the material distribution component 5 to rotate in the reverse direction. This realizes the switching between the two states of material temporary storage and material release, solving the problem of instantaneous material accumulation caused by direct dumping in traditional equipment.

[0026] Reference Figures 1-4The material distribution component 5 includes a material leakage disc 51 rotatably connected inside the material conveying component 4, a connecting rod 52 fixedly connected at one end to the outside of the material leakage disc 51, and a round shaft 53 fixedly connected below the other end of the connecting rod 52. The material leakage disc 51 has multiple material leakage channels 511 opened at equal angles. The output end of the telescopic device 3 is fixedly connected to a horizontal groove sleeve 31. The round shaft 53 is located inside the horizontal groove sleeve 31. When the material enters the material leakage channel 511, the material is supported by the guide disc 6 and is pushed to move by the material distribution component 5.

[0027] Specifically, when the expansion joint 3 extends or retracts, its output end drives the horizontal groove sleeve 31 to move horizontally. The round shaft 53 inside the groove of the horizontal groove sleeve 31 is subjected to force, while the material leakage disc 51 is located inside the conveying component 4 and is restricted, causing the round shaft 53 to slide in the groove of the horizontal groove sleeve 31. The connecting rod 52 pulls the material leakage disc 51 to rotate. If the material leakage disc 51 rotates in the forward direction, the material leakage channel 511 on its disc body is interconnected with the conveying component 4. At the same time, the material leakage channel 511 is completely misaligned with the guide disc 6, and the material leakage disc 51 and the guide disc 6 are not interconnected. During the forward rotation of the material leakage disc 51, the material leakage channel 511 temporarily stores the material. When it is necessary to add material into the furnace, the expansion joint 3 fully retracts, and the connecting rod 52 pushes the material leakage disc 51 to rotate in the reverse direction. At this time, the material leakage disc 51 and the guide disc 6 are interconnected. The material temporarily stored in the material leakage channel 511 of the material leakage disc 51 passes through the guide hole of the guide disc 6 to ensure that the slag composition is consistent.

[0028] Reference Figures 1-6 The material conveying component 4 includes a sleeve 41 fitted above the outer shell 1, multiple triangular inclined blocks 42 arranged at equal angles and fixedly connected inside the sleeve 41, an outer pull sleeve 43 fixedly connected outside the sleeve 41, and two positioning sleeves 44 arranged and fixedly connected outside the sleeve 41. The positioning sleeves 44 are symmetrical about the central axis of the sleeve 41. The sleeve 41 has a straight groove 411. There is a gap between the triangular inclined blocks 42 to form a discharge port.

[0029] Specifically, the triangular inclined blocks 42 are right-angled triangular block structures, fixedly connected at equal angles to the inner cavity wall of the housing 41. The number of them is the same as the number of straight slots 411, and the inclined surface of each triangular inclined block 42 faces the lower part of the corresponding straight slot 411. The function of the triangular inclined blocks 42 is to guide the material to slide down. When the material enters the interior from the top of the housing 41, it can smoothly slide down along the inclined surface of the triangular inclined blocks 42 into the material leakage channel 511 of the material leakage plate 51, while ensuring that the material falls accurately into the material leakage channel 511.

[0030] Reference Figures 2-6The connecting rod 52 passes through the straight groove 411. When the telescopic device 3 is fully retracted, the connecting rod 52 is in contact with the inner wall on one side of the straight groove 411. The angle between the connecting rod 52 and the inner wall on the other side of the straight groove 411 is half the angle of the multiple material leakage channels 511, ensuring the accuracy and stability of the rotation of the material distribution component 5.

[0031] Specifically, the width of the straight groove 411 is adapted to the cross-sectional dimensions of the connecting rod 52, providing space for the connecting rod 52 to rotate with the material discharge plate 51, and physically limiting the rotation range of the connecting rod 52 through the side wall of the straight groove 411, preventing the material discharge plate 51 from misaligning with the guide hole of the material discharge channel 511 and the guide plate 6 due to excessive rotation. When the expansion joint 3 is fully retracted, it drives the connecting rod 52 to move closer to the center of the furnace body 2 through the horizontal groove sleeve 31 and the round shaft 53. At this time, the side wall of the connecting rod 52 is tightly fitted with the inner wall of the straight groove 411 on the side closer to the center of the furnace body 2, ensuring that the material discharge plate 51 can accurately stop at the preset rotation angle each time the expansion joint 3 is fully retracted, so that the material discharge channel 511 and the guide plate 6 are accurately aligned and connected, avoiding material jamming or uneven distribution due to rotation angle deviation. At the same time, in the expansion joint 3 In the fully retracted and limited state, the side wall of the connecting rod 52 away from the center of the furnace body 2 and the inner wall of the straight groove 411 away from the center of the furnace body 2 form a fixed angle. The angle value of this angle is half of the equal angle of the multiple material leakage channels 511. For example, if three material leakage channels 511 are evenly opened on the material leakage plate 51, the equal angle of the material leakage channels 511 is 120 degrees. At this time, the angle between the connecting rod 52 and the inner wall of the other side of the straight groove 411 is also 60 degrees. This angle can achieve precise docking of a material leakage channel 511 with the straight groove 411 or the guide hole, avoiding angular misalignment during switching. Moreover, the operator can quickly determine whether the rotation position of the material leakage plate 51 is correct by observing the angle between the connecting rod 52 and the inner wall of the straight groove 411. The material distribution accuracy can be calibrated without disassembling the equipment, reducing debugging and maintenance costs.

[0032] Reference Figures 2-7 The guide plate 6 has multiple slots 61 at equal angles, and a circular groove 62 is formed in the middle of the guide plate 6. The one-way transmission component 8 is located inside the circular groove 62.

[0033] Specifically, the wall of the trough opening 61 adopts an inclined structure, with the inner wall inclined at five degrees towards the center. This allows the material to slide down quickly and smoothly to the guide component 7, reducing material residue on the surface of the guide plate 6. At the same time, it ensures that multiple groups of materials are released simultaneously without interference, further guaranteeing the uniformity of material distribution. In addition, the equiangular distribution of the trough opening 61 corresponds perfectly to the equiangular distribution of the material discharge channels 511 of the material discharge plate 51. When the material discharge plate 51 rotates in the opposite direction to the docking position with the guide plate 6, all material discharge channels 511 can be aligned with the trough opening 61 simultaneously, realizing multi-channel synchronous material distribution. This avoids uneven material distribution caused by angular deviation, laying a uniform material supply foundation for the subsequent circumferential sprinkling of the guide component 7.

[0034] Reference Figures 2-8 The material guide 7 is composed of multiple triangular inclined plates 71 arranged at equal angles. The number of triangular inclined blocks 42, material leakage channels 511, triangular inclined plates 71 and leakage outlets 61 are equal. When the material falls from the material leakage channel 511 to the leakage outlet 61, the triangular inclined blocks 42 and triangular inclined plates 71 have the same shape as the material leakage channel 511. The tops of the triangular inclined blocks 42 and triangular inclined plates 71 are inclined downwards to both sides.

[0035] The one-way transmission component 8 includes a sleeve 81 connected to the top of the guide component 7, multiple spring claws 82 arranged at equal angles and located inside the sleeve 81, a connecting disc 83 fixedly connected to the bottom of the discharge disc 51, and a ratchet 84 fixedly connected to the bottom of the connecting disc 83. The ratchet 84 is located inside the sleeve 81, thereby causing the guide component 7 to intermittently reach below the discharge slot 61. That is, the falling material will be divided into two states: falling in sections by the guide component 7 and falling directly. These two states are intermittent.

[0036] Specifically, the guide component 7 is composed of multiple triangular inclined plates 71 arranged at equal angles. The triangular inclined plates 71 have an isosceles triangular plate structure with their tops facing upwards and their two sides sloping downwards, forming a V-shaped guide slope. This inclined structure can use gravity to guide the material to slide down the slope. At the same time, through the guiding effect of the slope, the material is thrown towards the circumference of the inner wall of the furnace body 2, avoiding the accumulation of material in the center of the guide component 7. When the guide component 7 rotates under the drive of the sleeve plate 81, the slope of the triangular inclined plate 71 is exactly below the trough opening 61. The falling material lands on the slope of the triangular inclined plate 71, is divided by the slope and guided to the inner wall of the furnace body 2, realizing segmented falling and avoiding material concentration. When the guide component 7 is in an intermittent stop state, the gap of the triangular inclined plate 71, that is, the space between two adjacent triangular inclined plates 71, is exactly below the trough opening 61. The falling material directly falls into the central area of ​​the furnace body 2 through the gap, realizing direct falling.

[0037] Reference Figures 1-8The sleeve 81, connecting disc 83 and circular groove 62 are concentric. The sleeve 81 passes through the circular groove 62 and is fixedly connected to the guide component 7. The pawl 84 is in contact with the spring pawl 82.

[0038] The spring pawl 82 consists of three hooks and three springs, while the ratchet pawl 84 has three arc-shaped claws on the outside. The ratchet pawl 84 can rotate in both forward and reverse directions. In one direction of rotation, the arc-shaped surface of its claws will press against the hooks of the one-way spring pawl 82, and the claws will compress the springs. In the other direction of rotation, the ratchet pawl 84 will directly engage with the hooks of the spring pawl 82, thereby achieving one-way drive.

[0039] Reference Figures 1-8 The top of the outer shell 1 is provided with two limiting rods 101. The positioning sleeve 44 is sleeved on the outside of the limiting rods 101. By using an external lifting device to pull the outer sleeve 43, the material conveying component 4 can be directly separated from the internal equipment and the outer shell 1. When installation is required, the positioning sleeve 44 can be installed on the outside of the limiting rods 101, which allows for quick disassembly and assembly.

[0040] The working principle of this invention is as follows: First, the material leakage channel 511 is not currently filled with material, and the expansion joint 3 is in a fully retracted state. Activating the expansion joint 3 causes it to gradually extend from the fully retracted state. The output end drives the horizontal groove sleeve 31 to move horizontally away from the center of the furnace body 2. The circular shaft 53 inside the horizontal groove sleeve 31 slides along the groove wall under force, pulling the material leakage disc 51 to rotate forward via the connecting rod 52. The connecting rod 52 moves synchronously along the straight groove opening 411 until the expansion joint 3 is fully extended. At this time, the material leakage channel 511 of the material leakage disc 51... Aligning the feed passage of the casing 41 with the feed channel of the casing 41, and completely offset from the feed trough 61, various materials enter from the corresponding feed inlets of the casing 41, slide down the inclined surface of the triangular inclined block 42, and fall into the independent feed troughs 511 for temporary storage. After the materials are temporarily stored, the control telescopic device 3 retracts from its fully extended state, driving the transverse trough sleeve 31 to move closer to the center of the furnace body 2. The circular shaft 53 is subjected to reverse force, which pushes the feed trough disc 51 to switch to reverse rotation through the connecting rod 52 until the telescopic device 3 retracts completely again and the connecting rod 52 is in contact with the feed trough. The inner wall of the straight groove 411 and the material leakage channel 511 are realigned with the leakage opening 61. The new material temporarily stored in the material leakage channel 511 falls down along the leakage opening 61. The one-way transmission component 8 drives the guide component 7 to rotate intermittently. That is, the connecting plate 83 at the bottom of the material leakage disc 51 rotates in the opposite direction with the material leakage disc 51, which drives the pawl 84 to rotate in the sleeve disc 81. The pawl 84 pushes the spring pawl 82 to compress and store force. After passing the protruding end of the spring pawl 82, the spring pawl 82 resets and drives the sleeve disc 81 to rotate 60 degrees, thereby driving the guide component 7 to rotate intermittently. Rotating, when the slope of the triangular inclined plate 71 is directly opposite the trough opening 61, the material is divided by the slope and guided to the inner wall of the furnace body 2. The blocky alloy material falls into the high-temperature zone at the bottom of the furnace, avoiding local stacking. When the gap between adjacent triangular inclined plates 71 is directly opposite the trough opening 61, the material falls directly into the center of the furnace body 2. The powdered deoxidizer evenly covers the slag surface. Different particle sizes of slag material complete the initial material distribution, ensuring that the material reaches different positions inside the furnace body 2. Repeat the material distribution process of dividing and falling in batches to ensure that the material evenly covers the inside of the furnace and reduces the generation of inclusions. This process can be repeated in subsequent steps.

[0041] Example 2, refer to Figures 1-8 This is a second embodiment of the present invention, providing a high-speed steel preparation process that reduces inclusions. The process utilizes an intermediate frequency furnace for high-speed steel preparation that reduces inclusions, and includes the following steps: Step 1: Prepare the materials and pre-treat them by baking and drying at high temperature and classifying the particle size. Mix the materials according to the mass ratio, control the purity and particle size, avoid the introduction of impurities, and ensure that the raw materials meet the requirements. Step 2: Place the raw material above the conveyor 4, and control the distribution component 5 through the expansion joint 3 to allow the raw material to be intermittently and rapidly dispersed and fed in batches. Add other raw materials in sequence, and place the replenishing material above the conveyor 4 for rapid replenishment. Add slag-forming agent to control slag, then remove the conveyor 4, stir and tap the steel to complete the initial preparation of molten steel.

[0042] Step 3: The molten steel is heated to 1470-1510℃ in the LF furnace, and the composition is analyzed and fine-tuned. Refining slag is added to optimize the slag. Electrode heating and argon blowing are used to promote the reaction and adsorb inclusions, thereby improving the purity and composition accuracy of the molten steel. It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A medium-frequency furnace for preparing high-speed steel with reduced inclusions, comprising a shell (1), characterized in that: It also includes a furnace body (2) disposed inside the outer shell (1), a telescopic device (3) sleeved on the top of the furnace body (2), a conveying component (4) sleeved on the top of the furnace body (2), a material distribution component (5) rotatably connected inside the material distribution component (4), a guide plate (6) fixedly connected to the bottom of the material distribution component (5), a guide component (7) rotatably connected to the guide plate (6), and a one-way transmission component (8) connected between the material distribution component (5) and the guide component (7). The material distribution component (5) is located above the guide plate (6), and the guide component (7) is located above the guide plate (6). Below the material tray (6), the material distribution component (5) is connected to the output end of the telescopic device (3). The material distribution component (5) is attached to the guide tray (6). The guide tray (6) is in communication with the interior of the furnace body (2). When the telescopic device (3) is fully retracted, the top of the material conveying component (4) is not in communication with the material distribution component (5), and the material distribution component (5) is in communication with the guide tray (6). When the telescopic device (3) is fully extended, the top of the material conveying component (4) is in communication with the material distribution component (5), and the material distribution component (5) is not in communication with the guide tray (6).

2. The medium-frequency furnace for preparing high-speed steel with reduced inclusions according to claim 1, characterized in that: The material distribution component (5) includes a material leakage disc (51) rotatably connected inside the material conveying component (4), a connecting rod (52) fixedly connected at one end to the outside of the material leakage disc (51), and a round shaft (53) fixedly connected below the other end of the connecting rod (52). Multiple material leakage channels (511) are opened at equal angles on the material leakage disc (51). A horizontal groove sleeve (31) is fixedly connected to the output end of the telescopic device (3). The round shaft (53) is located inside the horizontal groove sleeve (31).

3. The medium-frequency furnace for preparing high-speed steel with reduced inclusions according to claim 2, characterized in that: The material conveying component (4) includes a sleeve (41) fitted on the outer shell (1), multiple triangular inclined blocks (42) set at equal angles and fixedly connected inside the sleeve (41), an outer pull sleeve (43) fixedly connected outside the sleeve (41), and two positioning sleeves (44) set and fixedly connected outside the sleeve (41). The positioning sleeves (44) are symmetrical about the central axis of the sleeve (41), and a straight groove (411) is opened on the sleeve (41).

4. The medium-frequency furnace for preparing high-speed steel with reduced inclusions according to claim 3, characterized in that: The connecting rod (52) passes through the straight groove (411). When the telescopic device (3) is fully retracted, the connecting rod (52) is in contact with the inner wall on one side of the straight groove (411). The angle between the connecting rod (52) and the inner wall on the other side of the straight groove (411) is half the angle of the multiple material leakage channels (511).

5. The medium-frequency furnace for preparing high-speed steel with reduced inclusions according to claim 4, characterized in that: The guide plate (6) has multiple slots (61) at equal angles, and a circular groove (62) is provided in the middle of the guide plate (6). The one-way transmission component (8) is located inside the circular groove (62).

6. The medium-frequency furnace for preparing high-speed steel with reduced inclusions according to claim 4, characterized in that: The guide component (7) is composed of multiple triangular inclined plates (71) arranged at equal angles. The number of triangular inclined blocks (42), material leakage channels (511), triangular inclined plates (71) and leakage channels (61) are equal. The triangular inclined blocks (42) and triangular inclined plates (71) have the same shape as the material leakage channels (511). The tops of the triangular inclined blocks (42) and triangular inclined plates (71) are inclined downwards to both sides.

7. The medium-frequency furnace for preparing high-speed steel with reduced inclusions according to claim 5, characterized in that: The one-way transmission component (8) includes a sleeve (81) connected to the top of the guide component (7), multiple spring claws (82) set at equal angles and located inside the sleeve (81), a connecting disc (83) fixedly connected to the bottom of the discharge disc (51), and a ratchet (84) fixedly connected to the bottom of the connecting disc (83). The ratchet (84) is located inside the sleeve (81).

8. The medium-frequency furnace for preparing high-speed steel with reduced inclusions according to claim 7, characterized in that: The sleeve disc (81), connecting disc (83) and circular groove (62) are concentric. The sleeve disc (81) passes through the circular groove (62) and is fixedly connected to the guide (7). The pawl (84) is in contact with the spring pawl (82).

9. The medium-frequency furnace for preparing high-speed steel with reduced inclusions according to claim 3, characterized in that: The top of the outer shell (1) is provided with two limiting rods (101), and the positioning sleeve (44) is sleeved on the outside of the limiting rods (101).

10. A high-speed steel preparation process that reduces inclusions, employing the medium-frequency furnace for high-speed steel preparation that reduces inclusions as described in claim 1, characterized in that... Includes the following steps: Step 1: Prepare the materials and pre-treat them. Mix the materials according to the mass ratio, control the purity and particle size, and avoid introducing impurities. Step 2: Place the raw material above the conveying component (4), and control the distributing component (5) through the telescopic device (3) to allow the raw material to be intermittently and quickly dispersed and fed in batches. Add other raw materials in sequence, and place the replenishing material above the conveying component (4) to quickly replenish the material. Then add slag-forming agent to control slag. After that, remove the conveying component (4), stir and then discharge the steel to complete the initial preparation of molten steel. Step 3: The molten steel is heated in the LF furnace, and its composition is analyzed and fine-tuned. Refining slag is added to optimize the slag. Electrode heating and argon blowing are used to promote the reaction and adsorb inclusions, thereby improving the purity and composition accuracy of the molten steel.

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