A converter-grade non-oxidizing molten steel sample rapid separation sub-lance probe

Abstract

This invention relates to the field of steelmaking equipment technology, specifically to a rapid sampling probe for non-oxidizing molten steel in a converter. It includes a probe body, with a detection module and a sampling module connected to its front end, and a connector connected to its rear end. A wire connects the detection module to the connector, and a gas pipe connects the sampling module to the connector. A protective cap is mounted on the front end of the probe body, comprising an iron cap rotatably connected to the probe body and a ceramic frame located outside the iron cap. The ceramic frame includes a fixing plate and several support bars. The fixing plate is connected to the end of the iron cap furthest from the probe body, and the support bars connect the fixing plate to the open end of the iron cap. The outer side of the support bars is arc-shaped. A stable dynamic "evacuation zone" is formed between adjacent guide bars. This effectively isolates the high-temperature molten steel outside the ceramic frame, minimizing direct and continuous contact between the molten steel and the surface of the inner iron cap.

Description

Technical Field

[0001] This invention relates to the field of steelmaking equipment technology, specifically to a rapid separation probe for non-oxidizing molten steel samples in a converter. Background Technology

[0002] Converter steelmaking is a core component of modern steel production, and precise control of its smelting process is crucial for steel quality, production efficiency, and cost. Sublance technology is the primary means of achieving dynamic computer control of the converter. By inserting a probe directly into the molten steel during the blowing process, it acquires real-time information such as temperature and composition, thereby enabling precise regulation of the smelting process. The sublance probe, as a key detection tool in this system, directly determines the accuracy and reliability of dynamic control.

[0003] Currently, mainstream sub-lance probes on the market (such as TSC and TSO probes) can integrate multiple functions such as temperature measurement, carbon determination, oxygen determination, and sampling. However, in actual high-temperature, high-oxidizing molten steel environments, the probe tip, especially the protective structure used to protect the internal detection module, faces severe challenges. When the probe is inserted into molten steel, its protective cap (usually made of metal) is subjected to a huge thermal shock instantly. This causes the protective cap (such as an iron cap) to easily melt and be damaged due to overheating at the moment of insertion or after a short pause. The high-temperature molten steel will then come into direct contact with the internal detection module (thermocouple, oxygen half-cell) and sampling module, resulting in existing sub-lance probes only being able to perform sampling and detection operations on the surface of the molten steel.

[0004] Therefore, developing a secondary lance probe that can significantly improve the high-temperature resistance of the front-end protective structure and extend its effective working time in molten steel, thereby supporting more stable and deeper detection and sampling, has become an urgent technical problem to be solved in order to improve the level of automated steelmaking in converters. Summary of the Invention

[0005] To address the above problems, this invention provides a rapid separation probe for non-oxidizing molten steel samples in a converter.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a converter non-oxidizing steel molten sample rapid separation auxiliary gun probe, including a probe body, a detection module and a sampling module connected to the front end of the probe body, a connector connected to the rear end of the probe body, a wire connected between the detection module and the connector, and a gas tube connected between the sampling module and the connector. The front end of the probe body is equipped with a protective cap, which includes an iron cap rotatably connected to the probe body and a ceramic frame located outside the iron cap. The ceramic frame includes a fixing plate and several support bars. The fixing plate is connected to the end of the iron cap away from the probe body, and the support bars are connected between the fixing plate and the open end of the iron cap. The outer side of the support bars is arc-shaped.

[0007] As an optimization, a connecting ring is provided on the outer side of the opening end of the iron cap, and the support strip is connected between the fixing piece and the connecting ring. Several support strips form a cage-like protective layer on the outer side of the iron cap.

[0008] As an optimization, the inner side of the support bar is fitted and connected to the outer side of the iron cap, and the outer side of the support bar extends to form a guide bar, the outer side of the guide bar being arc-shaped; One side of the guide bar is parallel to the outer side of the iron cap, and the other side of the guide bar is inclined away from the iron cap. When the iron cap drives the ceramic skeleton to rotate, an empty area is formed between two adjacent guide bars.

[0009] As an optimization, one side of the guide bar is the guide side, and the other side of the guide bar is the protective side. The distance between the guide side and the iron cap is smaller than the distance between the protective side and the iron cap. When the iron cap rotates, the molten steel is guided by the guide bar and thrown outward, forming an emptying zone between the protective side and the guide side of two adjacent guide bars, thus preventing the molten steel from contacting the iron cap.

[0010] As an optimization, the sampling module includes a rapid sample collection box, with an inlet at the front end and a gas tube at the rear end, the gas tube being used to supply nitrogen to the rapid sample collection box.

[0011] As an optimization, the detection module includes a thermocouple and an oxygen half-cell, wherein the thermocouple is used to detect the temperature of molten steel and the oxygen half-cell is used to detect the oxygen content of molten steel.

[0012] As an optimization, the probe body is equipped with a drive motor, the output shaft of the drive motor is connected to a drive rod, the drive rod passes through the axis of the probe body and is fixedly set with the iron cap, and the iron cap and the drive rod are coaxially set.

[0013] As an optimization, the fixing plate is coaxially connected to the iron cap, the fixing plate is connected to the outer end of the drive rod, and a plurality of the support bars are evenly distributed around the outer periphery of the iron cap.

[0014] The beneficial effects of this plan are as follows: The ceramic frame design of the protective cap in this application consists of a fixing plate and several support strips with a special arc-shaped outer surface. When the drive motor rotates the iron cap and ceramic frame at high speed, the guide strip design guides and throws away the attached molten steel along its arc-shaped outer surface under centrifugal force. A stable dynamic "vacuum zone" is formed between adjacent guide strips. This effectively isolates the high-temperature molten steel on the outside of the ceramic frame, minimizing direct and continuous contact between the molten steel and the inner surface of the iron cap. The heat load on the iron cap is significantly reduced, thereby significantly slowing down the melting rate of the iron cap, allowing the probe to remain safely in the molten steel for a longer period of time. This facilitates the insertion of the secondary probe into different positions and allows for sampling at different depths. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the axial side of the rapid sample collection box of the present invention.

[0017] Figure 3 This is a schematic diagram of the overall structure of the protective cap of the present invention.

[0018] Figure 4 This is a schematic diagram of the axial side of the protective cap of the present invention.

[0019] Figure 5 This is a schematic front view of the protective cap of the present invention.

[0020] Figure 6 For the present invention Figure 5 A schematic diagram of the AA cross-section structure.

[0021] Figure 7 This is a schematic diagram of the support strip structure of the present invention.

[0022] Figure 8 For the present invention Figure 1 A magnified structural diagram of part A.

[0023] The components include: 1. Probe body; 2. Iron cap; 3. Fixing plate; 4. Support bar; 5. Connecting ring; 6. Guide bar; 7. Emptying area; 8. Quick-splitting sample box; 9. Sample inlet; 10. Thermocouple; 11. Oxygen half-cell; 12. Drive rod; 13. Gas tube; 14. Wire; 15. Connector. Detailed Implementation

[0024] like Figures 1-8 As shown, a converter non-oxidizing molten steel sample rapid separation auxiliary gun probe includes a probe body 1. The front end of the probe body 1 is connected to a detection module and a sampling module. The rear end of the probe body 1 is connected to a connector 15. A wire 14 is connected between the detection module and the connector 15. A gas tube 13 is connected between the sampling module and the connector 15. The front end of the probe body 1 is equipped with a protective cap. The protective cap includes an iron cap 2 rotatably connected to the probe body 1 and a ceramic frame located outside the iron cap 2. The ceramic frame includes a fixing plate 3 and several support bars 4. The fixing plate 3 is connected to the end of the iron cap 2 away from the probe body 1. The support bars 4 are connected between the fixing plate 3 and the open end of the iron cap 2. The outer side of the support bars 4 is arc-shaped.

[0025] The probe body 1 has a slender tubular structure. The drive rod 12, wire 14 and air tube 13 are all distributed inside the probe body 1. The probe body 1 is made of high-strength, high-temperature resistant alloy steel pipe. The outside can be wrapped with fire-resistant fiber or coating to enhance the heat insulation performance. It is responsible for connecting the power, electrical signal and air circuit at the rear end with the execution components (protective cap, detection module and sampling module) at the front end, and ensuring the coaxiality and stability of each component during operation.

[0026] like Figure 3 As shown, a connecting ring 5 is provided on the outer side of the opening end of the iron cap 2, and the support bar 4 is connected between the fixing piece 3 and the connecting ring 5. Several support bars 4 form a cage-like protective layer on the outer side of the iron cap 2.

[0027] The iron cap 2 is a bowl-shaped or hemispherical metal cap body, with its open end facing the rear of the probe and its closed end facing the front. The outer side of the open end is machined with threads or grooves for fixing it to the connecting ring 5. The iron cap 2 is made of an alloy material with a melting point close to or lower than the temperature of molten steel.

[0028] The fixing plate 3 can be a disc-shaped ceramic plate or a ceramic plate with a mounting hole in the center, which is connected to the end of the drive rod 12 to ensure that the entire ceramic frame rotates synchronously with the iron cap 2. The ceramic frame is made of high-purity, high-density silicon nitride or silane ceramic material.

[0029] like Figure 3 and Figure 7 As shown, the inner side of the support bar 4 is fitted and connected to the outer side of the iron cap 2, and the outer side of the support bar 4 extends to form a guide bar 6, the outer side of the guide bar 6 being arc-shaped; One side of the guide bar 6 is parallel to the outer side of the iron cap 2, and the other side of the guide bar 6 is inclined away from the iron cap 2. When the iron cap 2 drives the ceramic skeleton to rotate, an emptying area 7 is formed between two adjacent guide bars 6.

[0030] like Figure 3 and Figure 7As shown, one side of the guide bar 6 is the guide side, and the other side of the guide bar 6 is the protective side. The distance between the guide side and the iron cap 2 is less than the distance between the protective side and the iron cap 2. When the iron cap 2 rotates, the molten steel is guided by the guide bar 6 and thrown outward, forming an emptying zone 7 between the protective side and the guide side of two adjacent guide bars 6 to prevent the molten steel from contacting the iron cap 2.

[0031] When the ceramic skeleton rotates at high speed, the molten steel attached to the guide strip 6 is accelerated and guided away along its smooth, arc-shaped outer surface (especially the guide side) under the action of centrifugal force. Due to the asymmetrical cross-section of the guide strip 6, a relatively low-pressure "venting zone 7" is formed between the protective side and the guide side of two adjacent guide strips 6. This area is difficult to be filled with molten steel because it is continuously thrown out, which is equivalent to establishing a dynamic "air film" isolation layer on the outer surface of the iron cap 2, greatly reducing the direct contact area and time between the high-temperature molten steel and the iron cap 2 body.

[0032] like Figure 1 and Figure 2 As shown, the sampling module includes a rapid sample collection box 8, with an inlet 9 at the front end and a gas tube 13 at the rear end, which provides nitrogen gas to the rapid sample collection box 8.

[0033] When the probe is inserted into the molten steel, the protective cap opens the working space, and the molten steel flows into the sample box from the inlet 9 under static pressure. At the same time, the gas tube 13 continuously introduces high-purity nitrogen into the sample box to drive out and replace the air in the box, providing an oxygen-free environment before the molten steel solidifies, thereby preventing sample oxidation and ensuring the authenticity of subsequent spectral or chemical analysis results.

[0034] like Figure 1 As shown, the detection module includes a thermocouple 10 and an oxygen half-cell 11. The thermocouple 10 is used to detect the temperature of molten steel, and the oxygen half-cell 11 is used to detect the oxygen content of molten steel.

[0035] Thermocouple 10 is a type B (platinum-rhodium 30-platinum-rhodium 6) or type S (platinum-rhodium 10-platinum) fast-disposable thermocouple. Its measuring end is located at a specific position behind the protective cap, near the sampling module. When molten steel flows into this area, it can quickly and accurately measure the temperature of the molten steel with a millisecond-level response. The wire 14 transmits the generated thermoelectric potential signal back to the post-processing system. The oxygen half-cell 11 uses a fast oxygen determination probe with a solid electrolyte (usually zirconia-based). Its probe is also arranged in the detection area. Utilizing the concentration cell principle, it measures the oxygen activity in the molten steel in real time, thereby calculating key information such as carbon content. Its signal is also transmitted through wire 14.

[0036] like Figure 1 and Figure 8As shown, the probe body 1 is equipped with a drive motor, and the output shaft of the drive motor is connected to a drive rod 12. The drive rod 12 passes through the axis of the probe body 1 and is fixedly installed with the iron cap 2. The iron cap 2 and the drive rod 12 are coaxially arranged.

[0037] A slender, rigid shaft originates from the drive motor at the rear of the probe body 1, passes through a channel in the center of the body, and is fixedly connected at its front end to the center of the fixing plate 3 of the protective cap. The rotational torque of the drive motor is directly and coaxially transmitted to the iron cap 2 and the ceramic frame, driving them to rotate at high speed. The drive rod 12 is made of high-temperature alloy steel and undergoes dynamic balancing calibration to reduce vibration during high-speed rotation.

[0038] The fixing plate 3 is coaxially connected to the iron cap 2, and the fixing plate 3 is connected to the outer end of the drive rod 12. Several support bars 4 are evenly distributed along the outer periphery of the iron cap 2.

[0039] How to use: During use, securely and correctly install the brand-new sub-lance probe onto the probe holder of the converter sub-lance measuring carriage via the connector 15 at its rear end. Ensure that the electrical and gas interfaces are properly connected and secure. Check the drive motor, detection circuit, and nitrogen supply system through the control system to ensure they are functioning correctly.

[0040] During the smelting stage where sampling is required (such as mid- or end-of-cycle blowing), the auxiliary lance trolley moves the probe to a predetermined position above the converter mouth. First, the drive motor is started, causing the iron cap 2 and its outer ceramic frame to rotate at high speed via drive rod 12. At this time, the nitrogen supply system can be turned on in advance to pre-purge the sampling module pipeline.

[0041] While the protective cap continues to rotate at high speed, the auxiliary gun trolley quickly inserts the probe vertically into the depth of the molten steel inside the converter. Because the rotating guide bar 6 can instantly create a venting zone 7, effectively isolating the molten steel from the surface of the iron cap 2, it greatly slows down the melting rate of the iron cap 2, allowing the probe to safely penetrate to the designated depth of the molten steel. After reaching the designated depth, the protective cap stops rotating, and the molten steel comes into contact with and melts the iron cap 2, allowing the molten steel to come into contact with the detection module and the sampling module.

[0042] As molten steel enters the detection area behind the protective cap, thermocouple 10 and oxygen half-cell 11 immediately begin operating, measuring the temperature and oxygen activity of the molten steel in real time. The measurement signals are transmitted to the host computer system in real time via wire 14.

[0043] Molten steel simultaneously flows into the rapid sampling box 8 through the sample inlet 9. Throughout the sampling process, low-temperature nitrogen gas is continuously introduced into the sample box through the gas pipe 13 to ensure that the sample cools and solidifies in an inert gas-filled environment, achieving oxidation-free sampling.

[0044] After the preset measurement and sampling time is completed, the auxiliary gun trolley quickly removes the probe from the molten steel. During the removal process, the ceramic skeleton acts as a cage-like protective layer, protecting the end of the probe body 1 and preventing steel slag from damaging the detection module. The drive motor can also continue to rotate for a short time to remove any remaining steel slag. After the probe is completely removed from the furnace opening, the drive motor and nitrogen supply are stopped.

[0045] After the probe cools to a safe temperature, the probe body 1 is removed from the auxiliary lance. In the laboratory, the rapid sample collection box 8 is opened, and an unoxidized steel sample is taken out for precise chemical composition analysis. Simultaneously, the processing system integrates online detection data such as temperature and oxygen content, providing crucial input to the converter dynamic control model and guiding subsequent smelting operations.

[0046] After this measurement, the detection module and protective cap at the probe tip are disposable components. Replace with a new probe and repeat steps 1-6 to perform the next measurement. This design significantly extends the lifespan of the protective structure, reducing the cost and frequency of each measurement. The above specific embodiments are merely specific examples of the present invention. The patent protection scope of the present invention includes, but is not limited to, the product form and style of the above specific embodiments. Any appropriate changes or modifications made by a person skilled in the art to a converter's non-oxidizing molten steel sample rapid separation sub-lance probe that conforms to the claims of the present invention should fall within the patent protection scope of the present invention.

Claims

1. A rapid separation probe for non-oxidizing molten steel samples in a converter, characterized in that: The device includes a probe body (1), the front end of which is connected to a detection module and a sampling module, the rear end of which is connected to a connector (15), a wire (14) connecting the detection module and the connector (15), and a trachea (13) connecting the sampling module and the connector (15). The front end of the probe body (1) is equipped with a protective cap. The protective cap includes an iron cap (2) rotatably connected to the probe body (1) and a ceramic frame located outside the iron cap (2). The ceramic frame includes a fixing plate (3) and several support bars (4). The fixing plate (3) is connected to the end of the iron cap (2) away from the probe body (1). The support bars (4) are connected between the fixing plate (3) and the open end of the iron cap (2). The outer side of the support bars (4) is arc-shaped.

2. The converter non-oxidizing molten steel sample rapid separation auxiliary gun probe according to claim 1, characterized in that: A connecting ring (5) is provided on the outside of the opening end of the iron cap (2), and the support strip (4) is connected between the fixing piece (3) and the connecting ring (5). Several support strips (4) form a cage-like protective layer on the outside of the iron cap (2).

3. The converter non-oxidizing molten steel sample rapid separation auxiliary gun probe according to claim 1, characterized in that: The inner side of the support bar (4) is attached to the outer side of the iron cap (2), and the outer side of the support bar (4) extends to form a guide bar (6), and the outer side of the guide bar (6) is arc-shaped. One side of the guide bar (6) is parallel to the outside of the iron cap (2), and the other side of the guide bar (6) is inclined away from the iron cap (2). When the iron cap (2) drives the ceramic skeleton to rotate, an empty area (7) is formed between two adjacent guide bars (6).

4. The converter non-oxidizing molten steel sample rapid separation auxiliary gun probe according to claim 3, characterized in that: One side of the guide bar (6) is the guide side, and the other side of the guide bar (6) is the protective side. The distance between the guide side and the iron cap (2) is less than the distance between the protective side and the iron cap (2). When the iron cap (2) rotates, the molten steel is thrown outward after being guided by the guide bar (6). An emptying area (7) is formed between the protective side and the guide side of two adjacent guide bars (6) to prevent the molten steel from contacting the iron cap (2).

5. The converter non-oxidizing molten steel sample rapid separation auxiliary gun probe according to claim 1, characterized in that: The sampling module includes a rapid sample box (8), with an inlet (9) at the front end and a gas tube (13) at the rear end, which is used to supply nitrogen to the rapid sample box (8).

6. The converter non-oxidizing molten steel sample rapid separation auxiliary lance probe according to claim 1, characterized in that: The detection module includes a thermocouple (10) and an oxygen half-cell (11). The thermocouple (10) is used to detect the temperature of molten steel, and the oxygen half-cell (11) is used to detect the oxygen content of molten steel.

7. The converter non-oxidizing molten steel sample rapid separation auxiliary gun probe according to claim 1, characterized in that: The probe body (1) is equipped with a drive motor, and the output shaft of the drive motor is connected to a drive rod (12). The drive rod (12) passes through the axis of the probe body (1) and is fixedly set with the iron cap (2). The iron cap (2) and the drive rod (12) are coaxially set.

8. The converter non-oxidizing molten steel sample rapid separation auxiliary gun probe according to claim 7, characterized in that: The fixing plate (3) is coaxially connected to the iron cap (2), the fixing plate (3) is connected to the outer end of the drive rod (12), and a number of the support bars (4) are evenly distributed around the outer periphery of the iron cap (2).

Images