Spiral progressive slag removal system for intermediate frequency furnace and slag removal method of spiral progressive slag removal system

Abstract

The invention discloses a spiral progressive slag removal system for an intermediate frequency furnace and a slag removal method of the spiral progressive slag removal system. The spiral progressive slag removal system comprises a slag salvaging mechanism, a lifting mechanism, a spiral driving module and a control system. The slag salvaging mechanism has a cut-in state and a salvaging state and can be switched in a slag layer; the spiral driving module drives the slag salvaging mechanism to move in a composite spiral track, namely, the slag salvaging mechanism revolves around the axis of the furnace chamber and rotates around the axis of the slag salvaging mechanism at the same time, so that the slag facing surface is always perpendicular to the radial direction; through the movement, the slag salvaging mechanism cuts into a slag layer in a spiral line, and the scraping and collecting range can cover the area of which the radial width is smaller than the width of the slag facing surface of the furnace chamber; according to the method, the turning radius of a spiral track is adjusted for multiple times from inside to outside, and state switching of a slag salvaging mechanism is matched, so that full-coverage scraping, collecting and salvaging of a furnace cavity section slag layer are achieved. Through spiral salvage treatment, the problems that in the prior art, slag cleaning is low in efficiency and not thorough, and the automation degree is low are solved.

Description

Technical Field

[0001] This invention relates to the field of metal smelting equipment technology, and in particular to a spiral progressive slag cleaning system and slag cleaning method for medium-frequency furnaces. Background Technology

[0002] During the metal smelting process, medium-frequency induction furnaces (hereinafter referred to as medium-frequency furnaces) generate a large amount of slag (floating slag) floating on the surface of the molten metal, as well as wall slag adhering to the furnace wall after smelting. Currently, slag cleaning mainly relies on manual labor or simple mechanical tools, which suffers from high labor intensity, harsh working environment, low cleaning efficiency, and incomplete cleaning. In particular, wall slag can only be manually removed after the furnace body has cooled down, seriously affecting production efficiency and posing safety hazards.

[0003] Existing mechanical slag removal devices are mostly simple grabbing or shoveling structures. For slag with a large distribution area, multiple repeated operations are often required, and it is difficult to handle viscous or hardened slag layers. For wall slag, there is a lack of effective online cleaning methods.

[0004] Therefore, there is an urgent need for a system and method that can achieve efficient, thorough, and automated cleaning of slag and wall ash in intermediate frequency furnaces. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a spiral progressive slag cleaning system and slag cleaning method for medium frequency furnaces. The spiral slag cleaning system solves the problems of low efficiency, incomplete cleaning and low degree of automation in the prior art.

[0006] Technical solution: To achieve the above objectives, the present invention provides a spiral progressive slag removal system and slag removal method for an intermediate frequency furnace, comprising a slag removal mechanism, a lifting mechanism, a spiral drive module, and a control system.

[0007] The slag removal mechanism can be inserted into the slag layer, and during the process of cutting into the slag layer, it gradually changes from the cutting state to the retrieval state. When it is in the retrieval state, a slag-containing space is formed inside, and it provides vertical and lateral support for the slag in the slag-containing space.

[0008] The power output end of the lifting mechanism is connected to the slag removal mechanism, which is used to drive the slag removal mechanism to descend in the furnace cavity in the cutting state, and to drive it to rise in the furnace cavity after the slag removal mechanism switches to the retrieval state.

[0009] The spiral drive module is used to drive the slag removal mechanism to perform two movements simultaneously when it descends: one is to perform a circular motion around the furnace cavity axis, and the other is to rotate around its own axis, so that its slag-facing direction is always perpendicular to the radial direction of the furnace cavity. Through the combined effect of these two movements, the slag removal mechanism cuts into the slag layer and scrapes the slag with a spiral trajectory. When the maximum width of the slag-facing surface of the slag removal mechanism is d, its scraping range can cover a circular or annular area in the cross-section of the furnace cavity with a radial width less than or equal to d.

[0010] The control system is communicatively connected to the state switching drive components of the lifting mechanism, the screw drive module, and the slag removal mechanism, and is used to coordinate the actions of each component according to the control signal.

[0011] Furthermore, the slag removal mechanism includes a slag removal plate and a slag blocking plate, both of which are hinged to the bottom of the lifting mechanism and can swing relative to each other; the slag receiving part of the slag removal plate includes an intercepting part, a supporting part, and an inserting part connected in sequence, which together form a bucket-shaped structure with one side open; when the slag removal mechanism is in the cutting state, the inserting part remains vertical; when the slag removal mechanism is in the retrieval state, the supporting part is basically horizontal, and the slag blocking plate swings until its lower edge closes with the front edge of the slag removal plate to enclose and form the slag-containing space.

[0012] Furthermore, the slag-receiving part of the slag-removing plate and / or the slag-blocking plate has a perforated mesh structure.

[0013] Furthermore, the slag removal plate always faces the furnace cavity wall on one side as the open side, and the other side is provided with a side baffle as the closed side, and the edge contour of the open side is adapted to the curvature of the cavity wall.

[0014] Furthermore, the slag removal mechanism is offset relative to its own axis of rotation, with the axis of rotation dividing its slag-facing surface, and the open-side slag-facing surface is wider than the sealed-side slag-facing surface.

[0015] Furthermore, the bottom of the lifting mechanism is also provided with a horizontally extending slag shovel, the scraping end of the slag shovel extending in a direction away from the open side.

[0016] Furthermore, when the slag-removing plate and the slag-blocking plate swing relative to each other to a fully retracted state, the slag shovel is located below the slag-removing mechanism.

[0017] A slag removal method includes slag removal and wall slag removal. The slag removal is carried out during the metal smelting process, and the wall slag removal is carried out in an empty furnace state after the metal smelting has stopped. When performing the wall slag removal, the wall slag in the furnace cavity is first scraped down to the bottom of the furnace to form bottom slag by a slag shovel, and then the bottom slag is retrieved from the bottom of the furnace by a slag retrieval mechanism. When the slag retrieval mechanism retrieves the slag and the bottom slag, it uses multiple spiral retrieval actions from the inside to the outside.

[0018] Furthermore, the process of multiple spiral retrieval actions from the inside out includes the following steps:

[0019] A1. The slag removal mechanism descends at a constant speed in a cutting state and extends into the slag / bottom slag layer.

[0020] A2. After extending into the slag layer, the slag-removing mechanism descends along a preset spiral trajectory, and the slag-removing plate maintains the cutting state to complete at least one complete circular motion.

[0021] A3. Maintain the spiral trajectory downwards, and gradually switch the slag removal plate from the cutting state to the retrieval state.

[0022] A4. After the slag removal plate is fully switched to the retrieval state and completes at least one complete circular motion, the spiral descent stops, and the slag baffle plate swings to close with the leading edge of the slag removal plate, forming a closed slag-containing space.

[0023] A5. The vertical lifting slag removal mechanism lifts the slag out of the furnace cavity and transfers it to the dumping station for slag discharge.

[0024] A6. Repeat steps A1-A5 above, increasing the radius of rotation of the spiral descent trajectory in each cycle, thus increasing the amount of... The width of the slag-receiving surface of the slag-removing mechanism is less than the maximum width d, until the scraping range of multiple scraping operations overlaps and covers the cross-section of the furnace cavity.

[0025] Furthermore, the process of scraping the wall slag to the furnace bottom to form bottom slag includes the following steps:

[0026] B1. Switch the slag removal mechanism to the retracted state so that the slag shovel is exposed at the bottom. Adjust the revolution angle of the slag removal mechanism through the spiral drive module, thereby adjusting the scraping end of the slag shovel to be directly opposite and close to the cavity wall.

[0027] B2. The slag shovel is driven by the lifting mechanism to complete at least one lifting movement in order to scrape off the wall slag in a vertical strip area.

[0028] B3. Repeat step B1, deflect the slag removal mechanism by an angle using the spiral drive module, and then repeat step B2 to complete the scraping of slag from the adjacent vertical strip area.

[0029] B4. Repeat step B3 multiple times until the entire circumferential inner wall of the furnace cavity is covered, and all wall slag is scraped off to the bottom of the furnace to form bottom slag.

[0030] Beneficial effects: The spiral progressive slag removal system and method for medium-frequency furnaces of the present invention have at least the following advantages:

[0031] (1) By descending the spiral trajectory and switching the state of the slag removal mechanism, the continuous scraping and effective collection of large-area slag layers are achieved. The coverage area of ​​a single operation is wide and the cleaning is thorough. It also helps to break the relatively viscous slag layer and separate the molten metal from the slag through stirring and loosening filtration, thereby reducing the loss of molten metal during the slag removal process.

[0032] (2) It integrates the functions of slag removal and wall slag scraping, realizing the comprehensive cleaning of the main slag types of medium frequency furnace.

[0033] (3) By coordinating the actions of each mechanism through the control system, the slag removal, scraping and discharge process can be automated, which significantly reduces the intensity of manual labor and safety hazards.

[0034] (4) The spiral progressive cleaning strategy can adapt to slag layers of different thicknesses and viscosities; the offset design improves the cleaning effect on slag layers near the furnace wall.

[0035] (5) Slag removal can be carried out during the smelting process, and wall slag removal does not require waiting for the furnace body to cool down completely, which greatly improves production efficiency. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the system of the present invention;

[0037] Figure 2 This is a schematic diagram of the bottom installation of the slag removal mechanism and the slag shovel relative to the lifting mechanism in one embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram showing the switching of the slag removal plate of the slag removal mechanism from the cutting state (left) to the slag removal state (right);

[0039] Figure 4 This is a top-view diagram of the spiral retrieval trajectory;

[0040] Figure 5 This is a schematic diagram of the slag removal mechanism in the slag removal state according to an embodiment of the present invention;

[0041] Figure 6 This is a flowchart illustrating the process of removing scum or bottom scum according to the present invention. Detailed Implementation

[0042] The invention will now be further described with reference to the accompanying drawings.

[0043] As attached Figure 1-6 The spiral progressive slag removal system and its slag removal method for medium-frequency furnaces include a slag removal mechanism 1, a lifting mechanism 2, a spiral drive module 9, and a control system 8.

[0044] The slag-removing mechanism 1 is the core component for performing the slag-removing action. It can be inserted into the slag layer, and during the process of cutting into the slag layer, it gradually changes from the cutting state to the slag-removing state. When it is in the slag-removing state, a slag-containing space 6 is formed inside it, and it provides vertical and lateral support for the slag in the slag-containing space 6.

[0045] like Figure 2 As shown, the slag removal mechanism 1 includes a slag removal plate 4 and a slag blocking plate 5. The slag removal plate 4 and the slag blocking plate 5 are mounted on the support at the bottom of the lifting mechanism 2 via their respective hinge shafts, and are driven to swing relative to each other by independent electric push rods or small hydraulic cylinders. The slag-facing surface of the slag removal plate 4 is formed by the sequential connection of an insertion part 41, a bearing part 42, and an intercepting part 43 to form a bucket-shaped structure similar to a winnowing basket, with the side facing the furnace wall being the open side and the other side having a side baffle as the closed side. When the slag removal mechanism 1 is in the cutting state, the insertion part 41 remains vertical; when the slag removal mechanism 1 is in the retrieval state, the bearing part 42 is basically horizontal, and the slag blocking plate 5 swings until its lower edge closes with the front edge of the slag removal plate 4 (i.e., the lower edge of the insertion part 41) to enclose and form the slag-containing space 6.

[0046] Preferably, the slag removal plate 4 and the slag baffle plate 5 are evenly distributed with mesh holes to form a perforated mesh structure. This structure allows molten metal to flow back into the furnace through the perforated mesh during the slag removal process, reducing metal loss, while increasing the friction between the slag and the mechanism to prevent slippage.

[0047] The slag removal mechanism 1 is connected to the power output end of the lifting mechanism 2 via a mounting base. The lifting mechanism 2 can be a linear drive device such as a hydraulic cylinder, electric push rod, or screw slide, used to drive the slag removal mechanism 1 to make vertical lifting and lowering movements. Specifically, it includes descending in the furnace cavity 3 in the cutting state and driving the slag removal mechanism 1 to rise in the furnace cavity 3 after switching to the slag removal state.

[0048] like Figure 2 As shown, a horizontally extending slag shovel 7 is also fixedly installed at the bottom of the lifting mechanism 2, with its scraping end (blade) extending away from the open side. This slag shovel 7 is specifically used to scrape off the wall slag adhering to the furnace wall in an empty furnace state. When the slag-removing plate 4 and the slag-blocking plate 5 swing relative to each other to a fully retracted state, the slag shovel 7 is located below the slag-removing mechanism 1. Retracting the slag-removing mechanism can prevent it from interfering with the wall slag cleaning operation and put the slag shovel in the lowest working position, making it easier to approach the furnace bottom to scrape the slag near the bottom of the wall.

[0049] like Figure 4 As shown, the screw drive module is used to drive the slag removal mechanism 1 to perform two movements simultaneously when the slag removal mechanism 1 descends:

[0050] First, the entire slag-removing mechanism 1 (including the output end of the lifting mechanism 2) is driven to rotate in a circle around the axis of the intermediate frequency furnace cavity 3, i.e., to revolve. Second, the slag-removing mechanism 1 is driven to rotate around the axis at its connection point with the lifting mechanism 2, i.e., to rotate. Through the combined action of these two movements, the slag-removing mechanism 1 cuts into the slag layer and scrapes the slag in a spiral trajectory; when the maximum width of the slag-facing surface of the slag-removing mechanism 1 is d, its scraping range can cover a circular or annular area in the cross-section of the furnace cavity 3 with a radial width less than or equal to d.

[0051] The helical drive module 9 typically includes a rotary drive motor, gear transmission, or slewing bearing, among other structures. Figure 2 As shown in the figure, in this embodiment, the screw drive module includes a slewing bearing 91 on which the lifting mechanism 2 is installed. The slewing bearing 91 is fixedly installed on the movable end of a rotating arm 92 by a mounting bracket. The rotating arm 92 consists of a rotating base and a movable trolley installed on the rotating base. It can perform horizontal rotation and telescopic movement. Through the cooperation of the movable trolley and the rotating base, the slag removal mechanism 1 can realize the revolution movement of the slag removal mechanism 1. The slewing bearing 91 can drive the lifting mechanism 2 and the slag removal mechanism 1 at its bottom to rotate together, thereby realizing the rotation movement of the slag removal mechanism 1.

[0052] The control system 8, such as a PLC or industrial computer, is communicatively connected to the lifting mechanism 2, the screw drive module, and the state switching drive of the slag removal mechanism 1. It can precisely control the speed and phase of the revolution and rotation according to the control signals, ensuring that the slag-facing surface (i.e., the open surface of the slag removal plate 4) of the slag removal mechanism 1 is always perpendicular to the tangent direction of the circular motion at that point, that is, always perpendicular to the radial direction of the furnace cavity, during its revolution. Thus, when the slag removal mechanism 1 descends under the drive of the lifting mechanism 2, its composite motion trajectory is a spiral.

[0053] The working process and method of the above-mentioned spiral progressive slag removal system are as follows: including two slag removal modes.

[0054] Mode 1, slag removal, is carried out during the smelting process:

[0055] The control system 8 issues a command to drive the slag removal plate 4 and the slag baffle plate 5 of the slag removal mechanism 1 to swing to the cutting state, as shown in the figure, with the insertion part 41 vertically downward.

[0056] The lifting mechanism 2 drives the slag removal mechanism 1 to descend, so that it inserts into the slag layer on the surface of the molten metal.

[0057] Simultaneously, the spiral drive module activates, driving the slag-removing mechanism 1 to revolve around the axis of the furnace cavity 3 at a speed of v1, while simultaneously rotating on its own axis at a corresponding angular velocity to maintain the slag-facing direction. At the same time, the lifting mechanism 2 drives it to descend at a speed of v2. The combination of these three forces causes the slag-removing mechanism 1 to cut into the slag layer along a spiral trajectory. Assuming the initial radius of rotation is R1, a small R1 ensures that the scraping area is close to the furnace center, for example, a circular area with a radius less than d centered on the furnace center.

[0058] During the spiral descent, the insertion part 41 of the slag-removing plate 4 cuts through the slag layer like a plow, and the slag material gathers into the bucket under the obstruction of the interception part 43 and the constraint of the side plate of the slag-removing plate 4. After descending to a certain depth (or completing at least one revolution), the control system 8 controls the state switching drive of the slag-removing mechanism 1, so that the slag-removing plate 4 slowly swings forward and upward from the vertical cutting state, gradually changing to a near-horizontal scooping state, forming a continuous scooping action.

[0059] When dealing with viscous slag, the slag-removing plate 4 in this design acts like a blade in its cutting state, prioritizing the cutting and penetration of the slag layer through at least one rotation, rather than simply scooping it up directly. This helps break up large chunks of viscous slag, reducing the amount of molten metal trapped at once. Furthermore, the subsequent slag-removing action is a dynamic closing process, giving the molten metal time and space to flow out from the gaps in the broken slag layer. The continuous spiral motion allows the slag-removing mechanism to stir and loosen the slag layer during the cutting and closing process, facilitating the separation of the entrained molten metal from the slag.

[0060] Therefore, compared to traditional manual or simple mechanical methods of directly scooping and rigidly removing viscous slag, this system exhibits relatively lower losses when removing viscous slag because its operation is dynamic, gradual, and includes a screening function, rather than a static, one-time encapsulation. The slag removal effect is also more thorough. Because viscous slag is difficult to handle, the combined action of spiral scraping and state switching is necessary to more effectively peel and collect the highly adhesive slag layer from the molten metal surface—something simple tools cannot achieve. Furthermore, handling high-viscosity, high-temperature slag is the most dangerous and labor-intensive aspect of manual operation. This system provides a replacement for this high-risk task, offering significantly higher safety and efficiency benefits.

[0061] This system, through a combination of "perforated mesh structure + spiral cutting + dynamic switching" design, proactively and intelligently reduces the inevitable loss of metal during the salvage process to an acceptable minimum, while simultaneously solving the fundamental problems of slag removal efficiency and operational safety.

[0062] When the slag removal plate 4 is completely horizontal (in the retrieval state) and has completed at least one more spiral motion, the spiral drive module stops its revolution and rotation, and the lifting mechanism 2 also stops descending. Figure 5As shown in the figure, at this time, the slag baffle 5 swings forward and downward under the action of the driving component, so that its lower edge closes with the lower edge of the insertion part 41 of the slag removal plate 4, forming a slag-containing space 6 with baffles on the front and sealing sides, a bearing part 42 at the bottom, and a restricted slag-containing space 6 on the open side due to its proximity to the furnace wall, which catches the scraped slag and makes it easy to remove it from the furnace cavity.

[0063] The lifting mechanism 2 moves in the opposite direction, vertically lifting the slag-collecting mechanism 1, which is fully loaded with slag, out of the furnace chamber 3. Then, it is moved to the tilting position next to the furnace by the rotating arm, switching the slag-collecting mechanism 1 from the scooping state to the retracted state, thereby discharging the slag.

[0064] One slag removal cycle is completed. To clean the slag from all areas of the furnace cavity, the control system 8 will plan multiple such cycles. If the revolution radius of the first cycle is R1, then in the second cycle, the screw drive module will set the initial revolution radius of the slag removal mechanism 1 to R2 = R1 + ( < d, where d is the maximum width of the slag-facing surface of the slag-removing plate 4), meaning it moves outward a small distance. This process is repeated, with the radius of rotation of the spiral trajectory increasing with each cycle. The process continues until the outermost spiral trajectory reaches the area close to the furnace wall. Through this multiple spiral scooping motion "from the inside out," the entire furnace cavity cross-section is eventually covered, achieving comprehensive cleaning of the scum.

[0065] The core design for achieving comprehensive cleaning lies in the fact that the slag-removing plate 4 is always open on one side facing the furnace cavity 3 wall, and the edge contour of this open side is adapted to the curvature of the cavity wall. This ensures that when removing the outermost slag, the open side can be close to or against the furnace wall, reducing slag residue near the furnace wall. Even if there are residues on the open side after multiple slag removals, the residues will fall within the area for the next slag removal. Furthermore, the slag-removing mechanism 1 can be pulled out close to or against the cavity wall in the final slag removal state, making the enclosed slag-containing space almost completely sealed, thereby removing all the slag.

[0066] Furthermore, the installation position of the slag removal mechanism 1 is offset relative to its rotation axis. Specifically, the rotation axis divides the slag-facing surface of the slag removal plate 4 into two parts: an open side (wide side) near the furnace wall and a closed side (narrow side) on the other side. The area of ​​the wide side is larger than that of the narrow side. This asymmetrical design, combined with the revolution motion, ensures that during the revolution, the wide side (open side) of the slag removal mechanism always faces the furnace wall as it spirals downward, thus more effectively handling the slag layer near the furnace wall in each spiral cycle.

[0067] Mode 2, wall slag cleaning, is carried out in an empty furnace state:

[0068] After smelting is completed and the molten metal is discharged, only slag adhering to the furnace wall remains inside the furnace. The control system 8 controls the slag removal plate 4 and the slag baffle plate 5 to retract to a fully upright retracted state, so that the slag shovel 7 is fully exposed and in its lowest position.

[0069] Scraping stage:

[0070] a. The spiral drive module drives the retracted slag removal mechanism 1 to revolve at a certain angle, so that the scraping end (the end where the blade is located) of the slag shovel 7 is directly facing and close to the furnace wall area that needs to be cleaned.

[0071] b. The lifting mechanism 2 drives the entire device to rise (or fall), and the blade of the slag scraper 7 scrapes off the slag layer adhering to the furnace wall, causing it to fall to the bottom of the furnace. The lifting and scraping can be repeated multiple times to ensure that the vertical strip area is cleaned.

[0072] c. After scraping a vertical strip, the spiral drive module drives the slag removal mechanism 1 to revolve at a small angle (e.g., 10-20 degrees), so that the slag shovel 7 is aligned with the next adjacent vertical strip area.

[0073] d. Repeat steps b and c until the slag shovel 7 circles the furnace wall once, scraping all the wall slag from the entire annular furnace wall to the bottom of the furnace, where it accumulates to form bottom slag.

[0074] Bottom slag removal stage: The subsequent steps are exactly the same as the "floating slag removal" process described above. Switch the slag removal mechanism 1 to the cutting state, and then perform multiple "inside to outside" spiral scooping actions to remove all the wall slag accumulated at the bottom of the furnace (which has now become bottom slag) from the furnace.

[0075] When the slag layer or the accumulated bottom slag layer is thick, the slag within a scraping range (a circular or annular area with a radius less than or equal to d) may not be cleared by a single spiral scooping action. Multiple slag-scooping cycles from the inside out can be used to clean the thick slag layer layer by layer from top to bottom. A resistance sensing module is introduced, which can be a strain gauge torque / force sensor or a pressure sensor, integrated into the lifting mechanism 2. The specific selection depends on the specific implementation of the lifting mechanism 2. This module senses the resistance changes as the slag-scooping plate 4 extends into the slag layer. There will be a significant resistance change feedback when the slag-scooping plate penetrates the molten metal layer or touches the furnace bottom. For example, when penetrating the slag layer and entering the molten metal layer, there will be a significant increase in resistance with a slower rate of change, while when touching the furnace bottom, there will be a significant increase in resistance with a sharp increase or a faster rate of increase.

[0076] When it is determined that the slag shovel has penetrated the slag layer, the slag shovel can be lowered further, and the scraping and scooping actions in the circumferential direction can continue within that height plane.

[0077] When it is determined that the slag shovel has touched the bottom of the furnace, the preset bottom slag cleaning mode is switched. By adjusting the lowering speed of the lifting mechanism 2, the slag shovel plate is kept close to or against the bottom of the furnace as it swings to the shoveling state. This process continues until the slag shovel plate is almost completely against the bottom of the furnace for scraping and collection. This avoids excessive impact on the furnace wall and damage to the furnace lining, while maximizing the comprehensive cleaning of slag.

[0078] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the above principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A spiral progressive slag cleaning system for an intermediate frequency furnace, characterized in that, include: The slag removal mechanism (1) can be inserted into the slag layer, and during the process of cutting into the slag layer, it gradually changes from the cutting state to the slag removal state. When it is in the slag removal state, a slag-containing space (6) is formed inside it, and it provides vertical and lateral support to the slag in the slag-containing space (6). The lifting mechanism (2) is connected to the slag removal mechanism (1) at its power output end. It is used to drive the slag removal mechanism (1) to descend in the furnace cavity (3) in the cutting state, and to drive the slag removal mechanism (1) to rise in the furnace cavity (3) after the slag removal mechanism (1) switches to the retrieval state. The spiral drive module (9) is used to drive the slag removal mechanism (1) to perform two movements simultaneously when it descends: one is to perform a circular motion around the axis of the furnace cavity (3), and the other is to rotate around its own axis, so that its slag-facing direction is always perpendicular to the radial direction of the furnace cavity (3); through the combined effect of these two movements, the slag removal mechanism (1) cuts into the slag layer and scrapes the slag with a spiral trajectory; when the maximum width of the slag-facing surface of the slag removal mechanism (1) is d, its scraping range can cover the circular or annular area in the cross section of the furnace cavity (3) with a radial width less than or equal to d; The control system (8) is communicatively connected to the state switching drive of the lifting mechanism (2), the screw drive module and the slag removal mechanism (1), and is used to coordinate the actions of each component according to the control signal.

2. The spiral progressive slag cleaning system for an intermediate frequency furnace according to claim 1, characterized in that: The slag removal mechanism (1) includes a slag removal plate (4) and a slag baffle plate (5), both of which are hinged to the bottom of the lifting mechanism (2) and can swing relative to each other; the slag receiving part of the slag removal plate (4) includes an interception part (43), a bearing part (42) and an insertion part (41) connected in sequence, which together form a bucket-shaped structure with one side open. When the slag removal mechanism (1) is in the cutting state, the insertion part (41) remains vertical; when the slag removal mechanism (1) is in the retrieval state, the bearing part (42) is basically horizontal, and the slag baffle (5) swings until its lower edge closes with the front edge of the slag removal plate (4) to enclose and form the slag-containing space (6).

3. A spiral progressive slag cleaning system for an intermediate frequency furnace according to claim 2, characterized in that: The slag-receiving part of the slag-removing plate (4) and / or the slag-blocking plate (5) are perforated mesh structures.

4. A spiral progressive slag cleaning system for an intermediate frequency furnace according to claim 3, characterized in that: The slag removal plate (4) always faces the furnace cavity (3) wall on one side as the open side and the other side is provided with a side baffle as the closed side. The edge contour of the open side is adapted to the curvature of the cavity wall.

5. A spiral progressive slag cleaning system for an intermediate frequency furnace according to claim 4, characterized in that: The slag removal mechanism (1) is offset relative to its own rotation axis, and its slag-facing surface is divided by the rotation axis. The slag-facing surface on the open side is wider than the slag-facing surface on the sealed side.

6. A spiral progressive slag cleaning system for an intermediate frequency furnace according to claim 5, characterized in that: The bottom of the lifting mechanism (2) is also provided with a horizontally extending slag shovel (7), the scraping end of the slag shovel (7) extending in a direction away from the open side.

7. A spiral progressive slag cleaning system for an intermediate frequency furnace according to claim 6, characterized in that: When the slag removal plate (4) and the slag blocking plate (5) swing relative to each other to the fully retracted state, the slag shovel (7) is located below the slag removal mechanism (1).

8. A slag removal method based on the system according to any one of claims 1-7, characterized in that: It includes slag cleaning and wall slag cleaning. The slag cleaning is carried out during the metal smelting process, and the wall slag cleaning is carried out in the empty furnace state after the metal smelting is stopped. When the wall slag cleaning is carried out, the wall slag of the furnace cavity (3) is first scraped down to the bottom of the furnace to form bottom slag by the slag shovel (7), and then the bottom slag is picked up from the bottom of the furnace by the slag scooping mechanism (1). When the slag scooping mechanism (1) picks up the slag and the bottom slag, it adopts multiple spiral scooping actions from the inside to the outside.

9. A slag removal method according to claim 8, characterized in that: The process of multiple spiral retrieval actions from the inside out includes the following steps: A1. The slag removal mechanism (1) descends at a constant speed in the cutting state and extends into the slag / bottom slag layer; A2. After extending into the slag layer, the slag removal mechanism (1) descends along a preset spiral trajectory, and the slag removal plate (4) maintains the cutting state to complete at least one complete circular motion; A3. Maintain the spiral trajectory downward, and the slag removal plate (4) gradually switches from the cutting state to the slag removal state; A4. After the slag removal plate (4) is fully switched to the retrieval state and completes at least one complete circular motion, it stops spiraling down and the slag baffle plate (5) swings to close with the front edge of the slag removal plate (4) to form a closed slag-containing space (6). A5. The vertical lifting slag removal mechanism (1) lifts the slag out of the furnace cavity (3) and transfers it to the dumping station for slag discharge; A6. Repeat steps A1-A5 above, increasing the radius of rotation of the spiral descent trajectory in each cycle, thus increasing the amount of... The maximum width d of the slag receiving surface of the slag removal mechanism (1) is less than that of the slag receiving surface until the scraping range is superimposed and covers the cross section of the furnace cavity (3).

10. A slag removal method according to claim 9, characterized in that: The process of scraping the wall slag down to the furnace bottom to form bottom slag includes the following steps: B1. Switch the slag removal mechanism (1) to the retracted state so that the slag shovel (7) is exposed at the bottom. Adjust the revolution angle of the slag removal mechanism (1) through the spiral drive module, thereby adjusting the scraping end of the slag shovel (7) to be directly opposite and close to the cavity wall. B2. The slag shovel (7) is driven by the lifting mechanism (2) to complete at least one lifting movement in order to scrape off the wall slag in a vertical strip area; B3. Repeat step B1, deflect the slag removal mechanism (1) by an angle through the spiral drive module, and then repeat step B2 to complete the scraping of the wall slag in the adjacent vertical strip area. B4. Repeat step B3 multiple times until the circumferential inner wall of the entire furnace cavity (3) is covered, and all wall slag is scraped off to the bottom of the furnace to form bottom slag.

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