Intermediate frequency furnace molten iron spectrum sample preparation device

Abstract

The utility model discloses a molten iron spectrum sample preparation device for an intermediate frequency furnace, which is applied to the field of casting. A sampler of the sampling device is positioned at the lower end of a vertical rod of a bracket, a transverse rod of the bracket is connected with a lifting component, the lifting component can lift along a guide frame, the guide frame is fixed on a gear component, and the gear component can rotate under the action of a driving component; and the sampler realizes lifting and rotary movement. A spectrum sample cavity is formed by a bottom mold and two half molds of the sample forming device, an opening and closing cylinder drives the half molds to be opened and closed, and a pushing cylinder pushes a spectrum sample to a conveying belt. A sampling chamber is arranged in the middle of the sampling plug, a sampling opening is formed in the bottom of the sampling chamber, and an air hole is formed in the top of the sampling chamber. The spectrum sampling device is matched with an automatic control system, pure sampling can be carried out from the intermediate frequency furnace, and a spectrum sample is poured in the sample forming device and conveyed to a spectrum chamber.

Description

Technical Field

[0001] This utility model is applied in the casting field and relates to the preparation of spectral samples of molten iron in a medium-frequency furnace, specifically a device for extracting molten iron from a medium-frequency furnace. Background Technology

[0002] In the casting industry, induction furnaces have become the main equipment for melting molten iron. Currently, rapid analysis of the molten iron's composition is mostly performed using spectroscopic methods. A sample is manually taken from the induction furnace using a sampling spoon, poured into a copper sample mold for rapid solidification, and then the surface for spectral analysis is smoothed before rapid spectral analysis on a spectrometer. While sample preparation and spectral analysis can now be automated, manual sampling within the induction furnace still hinders the automation of production at the furnace front.

[0003] There are many patents related to molten iron sampling devices, such as CN218156568U, CN221745649U, CN217819496U, CN217542189U, CN217424830U, CN217132632U, CN221528057U, etc. Among them, CN218156568U is a novel lifting-type molten iron slag remover temperature measurement and sampling device, which utilizes the lifting and telescopic functions of the molten iron slag remover to achieve temperature measurement and sampling of molten iron, replacing manual operation; CN221745649U is a blast furnace molten iron sampling device, used for sampling molten iron inside the blast furnace; CN217819496U is an automatic molten iron sampling device, which uses camera image recognition and laser rangefinder to detect the distance to the molten iron surface, and controls an electric hoist to drive the sampler to lift and lower automatically for sampling; CN217542189U is a molten iron temperature measurement and sampling device. To address the safety issues in blast furnace molten iron temperature measurement and sampling, CN217424830U describes a novel fully automatic molten iron sampling and temperature measurement device. This device uses an electrical control cabinet to control the lifting and lowering of a fixed plate. The fixed plate is equipped with a rangefinder, a temperature gun, and a sampler. The lifting and lowering of the fixed plate is controlled by an infrared rangefinder and a central processing unit within the electrical control cabinet, thus achieving stable measurement and sampling and improving measurement and sampling accuracy. CN217132632U describes an automatic quantitative molten iron sampling device that simulates manual sampling. A robotic arm connects to a sampling spoon to sample the molten iron from the ladle and then transfers it to a sample cup. However, the aforementioned sampling devices are either unsuitable for sampling in medium-frequency furnaces, do not consider the influence of slag on the molten iron surface on sample preparation, require manual operation, or do not consider the automatic pouring and transport of spectral samples to the spectral chamber. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a medium-frequency furnace molten iron spectral sample preparation device, which realizes the mechanized operation of sampling pure molten iron in the medium-frequency furnace, pouring molten iron spectral samples, and transporting them to the spectral chamber. When combined with an automatic control system, it can realize the automation of spectral sample preparation.

[0005] The technical solution adopted in this utility model is as follows: The medium-frequency furnace molten iron spectral sample preparation device includes a sampling device and a sample forming device. The sampling device includes a driving component, a fixed plate, a gear component, a guide frame, a lifting component, a motor component, a bracket, and a sampler. The sampler is suspended and connected to the lower end of the vertical rod of the L-shaped bracket. The lifting component is fixedly connected to the end of the crossbar of the bracket. The lifting component can move up and down along the guide frame under the action of the motor component. The bottom of the guide frame is fixed to the gear component, which is rotatably connected to the fixed plate and can stably rotate around the axis on the fixed plate. The gear component is geared to the driving component, which is mounted on the fixed plate. In this way, the sampler can move up and down under the action of the motor component and rotate under the action of the driving component. The sample forming device includes a bottom mold, a bottom plate, an opening and closing cylinder, a half mold, and a push cylinder. The bottom mold is embedded in or detachably connected to the base plate. The ribs behind the two half molds are fixedly and detachably connected to the opening and closing cylinder. A push cylinder is provided on one side of the opening and closing cylinder. The movement direction of the push cylinder is perpendicular to the movement direction of the opening and closing cylinder, and both pass through the center of the bottom mold. The center of the bottom mold is located on the rotation circumference of the sampler.

[0006] Furthermore, to ensure that the molten iron remains liquid during sampling and can be transported to the spectral chamber, the molten iron spectral sample preparation device also includes a heating furnace and a conveying device. The heating furnace is a rotary electric heating furnace with two semi-circular combined holes on the furnace top. These holes correspond to the sampling cylinder of the sampler, and the center of the holes is located on the circumference of the sampler's rotation.

[0007] Furthermore, to facilitate the installation of this device and keep the intermediate frequency furnace platform clean, the sampling device, sample preparation device, and heating furnace are fixedly installed as one unit, and the cables, gas pipes, and water pipes can be centrally arranged.

[0008] Furthermore, to facilitate cooling of the spectral sample during transport, the conveyor belt of the conveying device is a metal mesh belt.

[0009] Furthermore, to facilitate the detection of the depth of the sampler inserted into the molten iron in the medium-frequency furnace, an elastic body is clamped and connected between the lower end of the vertical rod of the support and the sampler. A pressure sensor is attached to the elastic body, and the buoyancy of the molten iron is detected by the pressure sensor to determine the depth of insertion into the molten iron.

[0010] Furthermore, as a structure for the stable operation of the lifting component, the lifting component includes a nut and a guide hole. The nut cooperates with the screw of the guide frame, and the guide hole cooperates with the guide rod on the guide frame.

[0011] Furthermore, for convenient sampling, the sampler includes a sampling rod, a support tube, a sampling cylinder, and a sampling plug. The lower end of the support tube is fixedly connected to the sampling cylinder, the upper end of the sampling rod is connected to the cylinder rod of the cylinder, and the lower end is connected to the sampling plug, which is fitted inside the sampling cylinder. A hollow sampling chamber is provided in the middle of the sampling plug, and a sampling port is provided at the bottom of the sampling chamber. The sampling ports are evenly distributed on the outer circumference of the sampling plug, and a vent is provided at the top of the sampling chamber.

[0012] Furthermore, to reduce the impact of high temperature on the cylinder, an insulation pad is installed between the sampling rod and the cylinder rod, and an insulation sheet is installed between the sampling cylinder and the support tube.

[0013] Furthermore, in order to enable the spectral sample to quickly regain its magnetism or reduce the temperature of the spectral sample, a water pipe is installed on the base plate, and a nozzle is installed on the water pipe, with the nozzle spraying water directly at the spectral sample.

[0014] The beneficial effects of this invention are as follows: The motor component controls the up-and-down movement of the sampler, and the drive component controls the rotational movement of the sampler. In conjunction with the automatic control system, it can automatically extract samples from the medium-frequency furnace and cast them into spectral samples within the sample-forming device. During sampling, the sampling chamber is sealed, eliminating the adverse effects of slag on the molten iron surface on the spectral sample. The coordinated operation of the opening and closing cylinders and the pushing cylinder of the sample-forming device pushes the spectral sample to the conveying device, which then transports it to the spectral chamber. Attached Figure Description

[0015] Figure 1 This is a top view of the layout of Example 1;

[0016] Figure 2 This is a front view schematic diagram of the sampling device (baking sampler status).

[0017] Figure 3 yes Figure 2 A schematic diagram of the structure from the left (in the state of being inserted into the intermediate frequency furnace).

[0018] Figure 4 This is a schematic diagram of the spectral sample casting process;

[0019] Figure 5 It is a top view of the sample-making device, and also Figure 1 A magnified view of a portion of the image;

[0020] Figure 6 This is a top view of the layout of Example 2;

[0021] Reference numerals: 1-Sampling device, 2-Sample preparation device, 3-Conveying device, 4-Medium frequency furnace, 5-Spectroscopic sample, 6-Heating furnace;

[0022] 11-Drive component, 12-Fixed plate, 13-Gear component, 14-Guide frame, 15-Lifting component, 16-Motor component, 17-Bracket, 18-Sampler, 19-Screw;

[0023] 21-Bottom mold, 22-Base plate, 23-Opening and closing cylinder, 24-Water pipe, 25-Half mold, 26-Push cylinder;

[0024] 181-Elastomer, 182-Cylinder rod, 183-Insulation pad, 184-Sampling rod, 185-Sampling plug, 186-Sampling cylinder, 187-Insulation sheet, 188-Support tube. Detailed Implementation

[0025] The spectral sample of molten iron is attached. Figure 4 As shown, the bottom circular plane is the spectral analysis surface, and the upper conical shape is used for molten iron feeding. There must be no defects such as porosity or slag inclusions on the spectral analysis surface. After grinding, the surface with a metallic luster is exposed.

[0026] Structures not described in detail below are all prior art, such as conveying devices, conveyor belts, and the arrangement of electric heating elements in heating furnaces. Example 1

[0027] The iron molten metal spectral sample preparation device in this embodiment is as shown in the attached document. Figure 1 As shown, it mainly includes a sampling device 1, a sample forming device 2, and a conveying device 3. The sampling device 1 is used to extract molten iron from the medium-frequency furnace, the sample forming device 2 is a spectral sample solidification and forming device, and the conveying device 3 is used to deliver the spectral sample to the spectral chamber.

[0028] The structure of sampling device 1 is shown in the attached figure. Figure 2-4 As shown, it includes a drive component 11, a fixing plate 12, a gear component 13, a guide frame 14, a lifting component 15, a motor component 16, a bracket 17, and a sampler 18. The cylinder barrel of the sampler 18 is suspended and connected to the lower end of the vertical rod of the L-shaped bracket 17, as shown in the attached diagram. Figure 4As shown, an elastic body 181 is clamped between the components. A pressure sensor is attached to the elastic body 181 to sense pressure and determine the depth of the sampler inserted into the molten iron surface based on the sensed pressure. A lifting component 15 is fixedly connected to the end of the crossbar of the support 17. The lifting component 15 includes a nut and a guide hole. The nut engages with the screw 19 on the guide frame 14, and the guide hole engages with the guide rod on the guide frame 14. When the screw 19 rotates, the lifting component 15 can move in one direction. A motor component 16 is installed at the top of the guide frame 14. The motor component 16 is connected to the screw 19 and can drive the screw 19 to rotate, thereby enabling the lifting component 15 to drive the support 17 and the sampler 18 to move up and down. The bottom of the guide frame 14 is fixed to a gear component 13. The gear component 13 is rotatably connected to a fixed plate 12 and rotates stably around a pivot on the fixed plate 12. The gear component 13 is geared to a drive component 11, which is mounted on the fixed plate 12. When the drive component 11 is activated, it connects to the drive gear component 13 via gears, causing the guide frame 14, bracket 17, and sampler 18 to rotate together around the axis. In other words, the drive component 11 enables the sampler 18 to rotate around the axis, and the motor component 16 enables the sampler 18 to move up and down.

[0029] The structure of sampler 18 is shown in the attached figure. Figure 4 As shown, the system includes a cylinder, a sampling rod 184, a support tube 188, a sampling cylinder 186, and a sampling plug 185. A vertical rod of a connecting bracket 17 is suspended from the upper end of the cylinder barrel, with an elastic body 181 sandwiched between them. The upper end of the support tube 188 is fixedly connected to the lower end of the cylinder barrel, and the lower end of the support tube 188 is fixedly connected to the sampling cylinder 186. The lower end of the cylinder rod 182 is connected to the sampling rod 184, and the lower end of the sampling rod 184 is connected to the sampling plug 185, which is fitted inside the sampling cylinder 186. When the cylinder rod 182 extends or retracts, it causes the sampling plug 185 to move freely up and down within the sampling cylinder 186. A hollow sampling chamber is provided in the middle of the sampling plug 185, and a sampling port is provided at the bottom of the sampling chamber, communicating with the outside. These sampling ports are evenly distributed on the outer circumference of the sampling plug. The sampling chamber has multiple small vents at the top. When molten iron enters the chamber through the sampling port, air inside the chamber is expelled through these vents, facilitating the entry of molten iron. When the molten iron flows out of the sampling port, the vents connect to the atmosphere, and atmospheric pressure promotes the rapid outflow of molten iron from the bottom sampling port. The size of the vents should be designed to prevent clogging by the non-wetting properties of the molten iron and allow for reuse. The length of the sampling tube is set according to the depth of insertion into the molten iron, ensuring that only the sampling tube is inserted into the molten iron during sampling. The sampling chamber is designed according to the dimensions of the spectral sample mold to ensure the formation of the spectral sample.

[0030] To increase the service life of the sampling tube and plug, they should ideally be made of refractory materials that do not wet molten iron, such as aluminosilicate chromium alloys. These materials possess excellent thermal shock resistance and resistance to molten iron wetting, effectively preventing molten iron from seeping into the slit. When the sampling tube is inserted into the molten iron, the molten iron will not enter the gap between the sampling plug and the sampling tube. Furthermore, the molten iron in the sampling chamber, being non-wetting, will not enter the vent and block it. Alternatively, the sampling tube and plug can be made of materials such as silicon carbide or boron carbide.

[0031] To facilitate the replacement of the sampling tube, the connection between the sampling tube and the support tube should be wrapped with refractory clay or refractory wool to isolate it from molten iron. To facilitate the replacement of the sampling plug, the sampling plug and the sampling rod should preferably be connected by a threaded connection or an insertion connection.

[0032] To ensure the molten iron remains liquid in the sampling chamber for a longer period and to prevent solidification, the sampling cylinder and sampling plug should be heated to a high temperature before sampling. There are various heating methods. For convenient gas heating, combustible gas can be used, but the temperature on the operating platform of the medium-frequency furnace is high, making it unsuitable for human work. Radiation heating of the molten iron can also be used, but this is above the medium-frequency furnace, which is inconvenient for operations such as charging, temperature measurement, and covering the furnace lid. This embodiment provides an electric heating method using a heating furnace 6. A schematic diagram of the heating furnace 6 is attached. Figure 1 and attached Figure 2 As shown, this is a rotary type furnace with two semi-circular combined holes on the top, the diameter of which corresponds to the sampling cylinder. Only the sampling cylinder and sampling plug are heated inside the heating furnace 6. During heating, the sampling plug should extend from inside the sampling cylinder to achieve rapid heating. The furnace temperature should be 900-1200℃. While higher temperatures are beneficial for sampling, they result in significant energy waste; lower temperatures, while not wasting energy, are detrimental to sampling. To avoid the adverse effects of the high temperature of the sampling cylinder and sampling plug on the cylinder, the sampling rod should be made of a refractory material with a low thermal conductivity. An insulation pad 183 is installed between the sampling rod 184 and the cylinder rod 182, and an insulation sheet 187 is installed between the sampling cylinder 186 and the support tube 188. The insulation pad 183 and the insulation sheet 187 should preferably be made of aerosol-type insulation materials with very low thermal conductivity.

[0033] The structure of sample preparation device 2 is shown in the attached figure. Figure 4 and attached Figure 5As shown, the system includes a bottom mold 21, a base plate 22, an opening / closing cylinder 23, two half-molds 25, and a pusher cylinder 26. The bottom mold 21 and the two half-molds 25 combine to form a casting cavity with a spectral pattern of molten iron. To achieve rapid heat dissipation and solidification of the molten iron, copper is often used. The bottom mold 21 is embedded in or detachably connected to the base plate 22 for easy replacement. Ribs on the back of the half-molds 25 are fixedly connected to the opening / closing cylinder 23, enabling the two half-molds 25 to open and close under the action of the cylinder. The opening / closing cylinder 23 is fixed to the base plate, and its direction of movement is consistent with the conveying direction of the conveying device 3. A pusher cylinder 26 is provided on the side of the opening / closing cylinder opposite to the conveying device. The direction of movement of the pusher cylinder 26 is perpendicular to the conveying direction and passes through the centerline of the bottom mold.

[0034] The conveyor device 3 is a motor-driven conveyor belt. The size of the purchased conveyor belt can be determined according to the size of the spectral sample, and the length of the conveyor belt is determined by the distance from the spectral chamber. A metal mesh belt is recommended for the conveyor belt. When the red-hot spectral sample is conveyed on the metal mesh belt, it can be cooled by air and metal, ensuring that it meets the temperature requirements for grinding when it arrives at the spectral grinding machine. If magnetic attraction is used to convey the spectral sample, or if the sample is close to the spectral chamber, a water pipe 24 can be installed on the base plate. A nozzle is installed on the water pipe 24, and the nozzle sprays water directly at the spectral sample. After the spectral sample solidifies, water is sprayed to cool it down. The cooled spectral sample becomes magnetic, meeting the temperature requirements for magnetic attraction conveying or grinding.

[0035] The working principle of the molten iron spectral sample preparation device in this embodiment is as follows: The sampling device is fixedly installed on the rear side of the intermediate frequency furnace, ensuring it does not interfere with the furnace's tilting and tapping. The center of the bottom mold of the sampling device and the center of the circular hole at the top of the heating furnace are both located on the circumference of the sampler's rotation axis. Before sampling, the sampling cylinder and sampling plug are baked in the heating furnace. Once all the molten iron in the intermediate frequency furnace has melted and reached the set temperature (not less than 1300℃), the heating furnace is opened, and the drive unit is activated. The gear unit drives the sampler to rotate above the intermediate frequency furnace via the guide frame and bracket. Then, the motor unit is activated, and the sampler is lowered into the molten iron via the lifting unit and bracket. At this time, the sampling plug is inside the sampling cylinder, and slag on the surface of the molten iron will not enter the sampling chamber. The sampler is suspended, allowing the buoyancy of the molten iron to be transmitted to the pressure sensor. When the sampler extends into the molten iron to a certain depth, the pressure sensor reaches the predetermined pressure, and the sampler stops moving downwards. The sampling cylinder remains in the molten iron for a few seconds, using the heat of the molten iron to reheat it to the required temperature, preventing the molten iron from solidifying in the sampling chamber after being removed from the furnace. The cylinder rod, via the sampling rod, moves the sampling plug downwards into the molten iron, which flows into the sampling chamber from the sampling port. Subsequently, the cylinder rod moves the sampling plug upwards into the sampling cylinder, stabilizing the molten iron within the sampling chamber. The motor component moves the sampler upwards out of the induction furnace, and the drive component rotates the sampler to the top of the sample-forming device. At this point, the two half-molds merge into a sample mold. The cylinder rod moves the sampling plug downwards, and all the molten iron in the sampling chamber flows out from the sampling port into the sample mold. The sampler then rotates back into the heating furnace for heat preservation. After the molten iron solidifies in the sample mold, the opening and closing cylinder opens the two half-molds, and the nozzle sprays water for cooling. The water volume is sufficient for rapid cooling of the spectral sample; no water droplets should remain on the bottom mold or half-mold before the next sampling. After the spectral sample cools, the push cylinder pushes the spectral sample onto the conveyor belt and retracts it. The conveying device transports the spectral sample to the sample grinding machine in the spectral chamber. The opening and closing cylinder drives the two half-molds to close, awaiting the next spectral sample preparation and casting.

[0036] Typically, multiple induction furnaces are arranged together, with markings on the half-molten iron to distinguish between the furnaces. After spectral analysis, the composition of the molten iron from each furnace can be displayed on a large screen on the wall. The conveyor belt can accommodate the transport of spectral samples of molten iron from multiple induction furnaces.

[0037] This embodiment can be integrated with an automatic feeding and control system for an induction furnace. Once the weight and temperature of the molten iron meet the set parameters, the device initiates automatic sampling. The motor component is controlled to stop by limit switches and pressure sensors, satisfying the vertical position requirements for furnace heating and molten iron sampling. The drive component is controlled to stop by a position sensor, satisfying the three rotational position requirements of the furnace, the upper part of the induction furnace, and the bottom mold. The drive component should ideally have two speed controls (fast and slow) to ensure precise coordination with the furnace and the bottom mold. The extension and retraction of the sampling plug within the sampling cylinder is controlled by time parameters. Example 2

[0038] This embodiment is an improvement on the planar layout of Embodiment 1, as shown in the attached figure. Figure 6 As shown. In Example 1, the sampling device, sample preparation device, and heating furnace are separate and need to be installed separately on the furnace platform. In this example, the three are integrated into a single unit, which is convenient and quick to install on the furnace platform.

[0039] The base plate of the sample-forming device and the fixing plate of the sampling device are combined into one. The heating furnace is mounted on the fixing plate, so that the center of the bottom mold of the sample-forming device and the center of the circular hole at the top of the heating furnace are on the circumference of the sampler rotating around its axis. Because the heating furnace, sample-forming device, and conveyor belt are at different elevations, the conveyor belt can pass under the heating furnace, and the sampler can rotate through the sample-forming device from above. In this embodiment, cables, gas pipes, and water pipes can be centrally arranged, making the medium-frequency furnace platform more organized and simple, facilitating inspection.

[0040] This invention uses a screw and nut to lift and lower the sampler, which results in relatively high manufacturing and maintenance costs. Under the guidance of a guide frame, existing technology can also be used to employ a motor to drive a wire rope, or other lifting methods such as a cylinder or hydraulic cylinder to lift and lower the sampler. Similarly, the cylinder that drives the sampling plug can be replaced by a screw and nut structure or a connecting rod structure.

[0041] This invention uses a pressure sensor to measure the depth of the probe inserted into molten iron, but a distance measuring method can also be used. However, considering that the distance measuring instrument is subject to the high temperature radiation of the molten iron, it is easily damaged and is not as stable as a pressure sensor that operates at room temperature.

[0042] This invention employs water spray cooling for the spectral sample, and the conveyor belt of the conveying device can also be a high-temperature resistant rubber belt or a canvas belt.

[0043] This invention facilitates the automatic sampling and transport of samples from multiple intermediate frequency furnaces to the spectral chamber. The conveyor belt's transport direction is perpendicular to the pusher cylinder's movement direction. However, the conveyor belt's transport direction depends on the positions of the spectral chamber and the intermediate frequency furnace; a perfect perpendicularity between the two directions is not required, as long as the pusher cylinder can push the spectral sample onto the conveyor belt. If the spectral chamber is located behind the intermediate frequency furnace, the pusher cylinder's movement direction can also be consistent with the conveyor belt's transport direction.

Claims

1. A device for preparing spectral samples of molten iron from a medium-frequency furnace, characterized in that: Includes sampling device and sample preparation device; The sampling device includes a drive component (11), a fixed plate (12), a gear component (13), a guide frame (14), a lifting component (15), a motor component (16), a bracket (17), and a sampler (18). The sampler (18) is suspended and connected to the lower end of the vertical rod of the L-shaped bracket (17). The lifting component (15) is fixedly connected to the end of the crossbar of the bracket (17). The lifting component (15) can move up and down along the guide frame (14) under the action of the motor component (16). The bottom of the guide frame (14) is fixed on the gear component (13). The gear component (13) is rotatably connected to the fixed plate (12) and can rotate stably around the axis on the fixed plate (12). The gear component (13) is geared to the drive component (11). The drive component (11) is mounted on the fixed plate (12). The sample forming device includes a bottom mold (21), a base plate (22), an opening and closing cylinder (23), a half mold (25), and a push cylinder (26); the bottom mold (21) is embedded or detachably connected to the base plate (22), and the ribs on the back of the two half molds (25) are fixedly connected to the opening and closing cylinder (23). A push cylinder (26) is provided on one side of the opening and closing cylinder (23). The movement direction of the push cylinder (26) is perpendicular to the movement direction of the opening and closing cylinder (23), and both pass through the center of the bottom mold (21). The center of the bottom mold (21) is located on the circumference of the sampler (18).

2. The apparatus for preparing spectral samples of molten iron in a medium-frequency furnace according to claim 1, characterized in that: It also includes a heating furnace and a conveying device; the heating furnace is a rotary electric heating furnace with two semi-circular holes on the top of the furnace, which correspond to the sampling tube of the sampler (18), and the center of the holes is located on the circumference of the sampler (18) rotation.

3. The apparatus for preparing spectral samples of molten iron in a medium-frequency furnace according to claim 2, characterized in that: The sampling device, sample preparation device, and heating furnace are fixedly installed as one unit.

4. The apparatus for preparing spectral samples of molten iron in a medium-frequency furnace according to claim 2, characterized in that: The conveyor belt of the conveying device is a metal mesh belt.

5. The apparatus for preparing spectral samples of molten iron in a medium-frequency furnace according to claim 1, characterized in that: An elastic body (181) is clamped between the lower end of the vertical rod of the bracket (17) and the sampler (18), and a pressure sensor is attached to the elastic body (181).

6. The apparatus for preparing spectral samples of molten iron in a medium-frequency furnace according to claim 1, characterized in that: The lifting component (15) includes a nut and a guide hole. The nut engages with the screw (19) of the guide frame (14), and the guide hole engages with the guide rod on the guide frame (14).

7. The apparatus for preparing spectral samples of molten iron in a medium-frequency furnace according to claim 1, characterized in that: The sampler (18) includes a sampling rod (184), a support tube (188), a sampling cylinder (186), and a sampling plug (185); the lower end of the support tube (188) is fixedly connected to the sampling cylinder (186), the upper end of the sampling rod (184) is connected to the cylinder rod (182) of the cylinder, and the lower end is connected to the sampling plug (185), and the sampling plug (185) is fitted inside the sampling cylinder (186); a hollow sampling chamber is provided in the middle of the sampling plug (185), a sampling port is provided at the bottom of the sampling chamber, the sampling ports are evenly distributed on the outer circumference of the sampling plug (185), and a vent is provided at the top of the sampling chamber.

8. The apparatus for preparing spectral samples of molten iron in a medium-frequency furnace according to claim 7, characterized in that: An insulating pad (183) is installed between the sampling rod (184) and the cylinder rod (182), and an insulating sheet (187) is installed between the sampling cylinder (186) and the support tube (188).

9. The apparatus for preparing spectral samples of molten iron in a medium-frequency furnace according to claim 1, characterized in that: A water pipe (24) is installed on the base plate (22), and a nozzle is installed on the water pipe (24).

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