A molten steel composition on-line detection system and method

Abstract

The present application relates to laser-induced breakdown spectroscopy online detection technical field, especially relates to a molten steel component online detection system and method. The detection system includes detection unit, displacement unit, upper gun unit and gun receiving unit, wherein the detection unit is arranged on the displacement unit, the detection unit includes a probe and a hollow structure probe gun mounted on the probe, the probe gun tail end is provided with a detachable gun head; The laser emitted by the probe is emitted through the probe gun to realize online detection of molten steel component; The upper gun unit is used for storing and mounting the gun head; The gun receiving unit is used for accommodating the waste gun head; The displacement unit is used for driving the detection unit to move between each operation unit. The present application can maintain the sealing property, optical alignment and calibration before and after changing the gun, so that the system can work stably, and adapt to the actual process and production rhythm of molten steel smelting.

Description

Technical Field

[0001] This invention relates to the field of laser-induced breakdown spectroscopy online detection technology, and particularly to an online detection system and method for molten steel composition. Background Technology

[0002] In the steelmaking process, achieving the correct composition of molten steel within the furnace is the primary smelting objective. Existing publicly available online steel composition detection solutions based on laser-induced breakdown spectroscopy (LAS) technology typically employ a hollow, high-temperature resistant tube with an inert gas chamber at the front of the detection device. The probe is moved manually or automatically to pierce the slag layer on the molten steel surface, reaching a certain depth below the molten steel. This allows the laser to focus and excite on the steel surface, collecting plasma signal light for composition detection. In these existing solutions, the high-temperature resistant tubes can be categorized as disposable, reusable, or non-consumable. Considering the actual working conditions in steelmaking, regardless of the type of high-temperature resistant tube, due to the adhesion and corrosiveness of the molten metal and its surface slag, coupled with lifespan limitations caused by thermal shock, splashing, and accidental mechanical damage, the tubes inevitably require periodic maintenance or replacement. Since detection accuracy is sensitive to the laser focusing position, alignment deviations introduced during the tube replacement process due to manufacturing or installation must be within acceptable limits; otherwise, the focusing position will be affected, potentially leading to inaccurate detection. On the other hand, if there is a sealing failure after the new gun is installed, it will cause molten steel to backflow and cause damage. In addition, since air inevitably gets into the gun during the replacement process, it will affect the transmission efficiency of ultraviolet signals and accelerate the high-temperature oxidation of the internal structural components of the probe, thus affecting its lifespan. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an online steel composition detection system and method, enabling accurate and efficient replacement of the gun head during the online steel composition detection process.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides an online steel composition detection system, comprising a detection unit, a displacement unit, a gun mounting unit, and a gun retraction unit. The detection unit is mounted on the displacement unit and includes a probe and a hollow probe mounted on the probe. The probe has a detachable head at its end. The laser emitted by the probe passes through the probe to detect the steel composition online. The gun mounting unit is used for storing and mounting the probe head. The gun retraction unit is used for collecting discarded probe heads. The displacement unit is used to move the detection unit between the various operating units.

[0006] The gun mounting unit includes a closed housing, a gun head frame, a gun head holder, and a rotary drive mechanism. The gun head frame is rotatably mounted inside the closed housing and its bottom is connected to the rotary drive mechanism. The gun head frame is used to store the gun head. The top of the closed housing is provided with an openable and closable gun door. The gun head holder is located at the bottom of the closed housing and is coaxially arranged with the openable and closable gun door. The gun head holder is used for sealing and inspecting the corresponding gun head on the gun head frame.

[0007] The gun head support includes an upper plate, a lower plate, a gun head slot, and a buffer structure. The upper plate and the lower plate are arranged parallel to each other and are connected by multiple gun head slots arranged circumferentially. Each gun head slot is a hollow structure that runs vertically through the gun head, and a buffer structure is provided on the bottom inner side of each gun head slot. The buffer structure is used to support the gun head placed in the gun head slot. When the gun head support rotates, the gun head slot can move sequentially along the rotation direction to the position where the gun door can be opened and closed.

[0008] The bottom of the gun head support is connected to a pneumatic or electric actuator via an elastic floating structure, and is driven by the pneumatic or electric actuator to allow the gun head support to rise and fall along the axis of the gun head groove.

[0009] The probe holder includes a support plate, a standard block, a sealing ring, and a standard block rotation drive motor. The standard block rotation drive motor is mounted on the support plate, and its output end is connected to the standard block. A sealing ring is provided on the top of the standard block. The standard block and the detection port at the end of the probe are not coaxially arranged. The sealing ring is designed to achieve an airtight seal when the detection port at the end of the probe contacts the standard block. The standard block is used to verify whether the probe installation position at the end of the probe in the detection unit is accurate.

[0010] The gun collection unit includes a guide module, a crushing module, and a collection box. The guide module is located at the top of the collection box and is used to guide the discarded gun heads into the collection box. The crushing module is located inside the collection box and is used to crush the discarded gun heads that have entered through the guide module.

[0011] The upper part of the collection box is provided with a track and a push plate that slides with the track. The push plate is connected to a horizontal drive module, which drives the push plate to move horizontally and flatten the debris in the collection box.

[0012] The displacement unit includes a lifting shaft and an alignment shaft connected in sequence, wherein the lifting shaft has a degree of freedom to move along the height direction, and the alignment shaft has a degree of freedom to move along the horizontal direction.

[0013] The lifting shaft includes a column, a lifting slide, a lifting rail, and a chain drive mechanism. The lifting rail and the chain drive mechanism are arranged vertically on the column. The lifting slide slide slides or rolls with the lifting rail, and the lifting slide is connected to the chain drive mechanism, which provides power for the lifting of the lifting slide.

[0014] The alignment axis includes a horizontal arm, a horizontal slide rail, a rack, a horizontal slide table, and a horizontal motor. One end of the horizontal arm is connected to the lifting slide table. The horizontal slide rail and the rack are arranged parallel to each other on the horizontal arm. The horizontal slide table slides in conjunction with the horizontal slide rail. The horizontal motor is mounted on the horizontal slide table and its output end meshes with the rack through a gear. The detection unit is installed on the horizontal slide table.

[0015] Another aspect of the present invention provides a detection method using the online steel composition detection system described above, comprising the following steps:

[0016] The displacement unit drives the detection unit to move from the standby position to the detection position;

[0017] The displacement unit first drives the detection unit to approach the slag layer on the surface of the molten steel, pauses for a few seconds as needed for detection, and then emits a laser to detect the slag signal.

[0018] The displacement unit drives the detection unit to immerse itself in the molten steel to a set depth to begin composition detection;

[0019] After the component detection is completed, the displacement unit drives the detection unit to the standby position and enters the standby state;

[0020] When the nozzle reaches its predetermined lifespan, it is removed and placed into the nozzle collection unit, which collects the discarded nozzles.

[0021] After the gun head is removed, the displacement unit drives the detection unit to the gun mounting position, completing the installation of the gun head;

[0022] Verify the correct installation of the detection unit and the gun head;

[0023] After the gun head detection is completed, the displacement unit drives the detection unit to the standby position and enters the standby state.

[0024] The verification of the correct installation of the detection unit and the gun head includes the following steps:

[0025] After the nozzle is installed, the nozzle support rises, the standard sample block contacts the detection port of the nozzle, and is sealed by the sealing ring;

[0026] After the probe is filled with argon gas and reaches the set pressure, it is then vented. This process is repeated several times to check the pressure of the probe and verify the sealing of the installation.

[0027] Excitation testing was performed on the standard sample block to verify the correct installation of the testing unit and the gun head.

[0028] The advantages and beneficial effects of this invention are as follows: This invention provides an online steel composition detection system and method that addresses the stability issues of system detection status and effectiveness before and after lance change in immersion-type steel detection methods, including airtightness and alignment issues encountered during lance change in the refining process when applying LIBS technology. This invention enables the system to maintain sealing, optical alignment, and calibration before and after lance change, allowing the system to operate stably and adapt to the actual steel smelting process and production rhythm. Furthermore, it enables the detection system to maintain sealing and quickly remove air from the lance head after lance head replacement, ensuring stable operation and adapting to the actual steel smelting process and production rhythm. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of an online steel composition detection system according to the present invention;

[0030] Figure 2 for Figure 1 Enlarged view of a section at point I;

[0031] Figure 3 This is a schematic diagram of the displacement unit in this invention;

[0032] Figure 4 for Figure 3 The left view;

[0033] Figure 5 This is a schematic diagram of the upper gun unit in this invention;

[0034] Figure 6 This is a schematic diagram of the gun headstock structure in this invention;

[0035] Figure 7 This is a schematic diagram of the gun-collecting unit in this invention.

[0036] In the diagram: 1-Detection unit, 11-Probe, 12-Probe gun, 121-Probe gun rod, 122-Gun head, 123-Detection port;

[0037] 2-Displacement unit, 21-Alignment axis, 211-Horizontal arm, 212-Horizontal slide rail, 213-Rack, 214-Horizontal slide table, 215-Horizontal motor, 22-Lifting shaft, 221-Column, 222-Lifting slide table, 223-Pulley, 224-Lifting slide rail, 225-Chain, 226-Upper sprocket, 227-Lower sprocket, 228-Lifting motor, 229-Tension wheel, 230-Drive wheel, 23-Upper gun position, 24-Standby position, 25-Detection position;

[0038] 3-Upper gun unit, 31-Enclosed chamber shell, 32-Openable gun door, 33-Gun head support, 331-Upper plate, 332-Lower plate, 333-Buffer structure, 335-Gun head groove, 34-Gun head support rotation drive motor, 35-Gun head support, 351-Support plate, 352-Standard block, 353-Sealing ring, 354-Standard block rotation drive motor;

[0039] 4-Gun receiving unit, 41-Guiding module, 42-Crushing module, 43-Crushing box, 431-Railway, 432-Push plate. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] See Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an online steel composition detection system, including a detection unit 1, a displacement unit 2, a gun mounting unit 3, and a gun retraction unit 4. The detection unit 1 is mounted on the displacement unit 2 and includes a probe 11 and a hollow probe 12 mounted on the probe 11. The probe 12 has a detachable gun head 122 at its end. Laser emitted from the probe 11 passes through the probe 12 to achieve online detection of the steel composition. The gun mounting unit 3 is used for storing and mounting the gun head 122. The gun retraction unit 4 is used to collect discarded gun heads. The displacement unit 2 is used to move the detection unit 1 between various operating units. Specifically, under the support and drive of the displacement unit 2, the detection unit 1 can change its spatial position and posture to adapt to the spatial requirements of the application scenario to achieve the detection purpose. Generally, it needs to have different functional positions such as a detection position 25, a standby position 24, and a gun mounting position 23.

[0042] In this embodiment of the invention, the probe 11 is a laser-induced breakdown spectroscopy detection device composed of a laser, a beam splitting detection device, and an optical lens group. Specifically, in this embodiment, the laser can be a solid-state pulsed laser with a single-pulse energy of not less than 80 mJ. The optical lens group includes a first reflecting mirror, a second reflecting mirror, a laser beam expander group, and a collection coupling. The beam splitting detection device consists of a slit, a reflective grating, and a photodetector. A light outlet capable of emitting laser light and collecting signal light is provided at the lower end of the probe 11, and it is coaxially and sealedly connected to the probe gun 12.

[0043] See Figure 1 and Figure 2As shown in the embodiment of the present invention, the probe 12 is a hollow tubular structure capable of conducting light and gas. The probe 12 includes a probe rod 121 and a probe head 122. One end of the probe rod 121 is coaxially connected to the light outlet of the probe 11. To detect high temperatures at the detection location, the other end of the probe rod 121 is coaxially and sealed with a high-temperature resistant hollow tubular probe head 122 that can be detached along the probe axis. The end of the probe head 122 is a detection port 123 in the shape of a hole that can output focused laser and gas flow into the molten steel being tested. Specifically, the probe head used in this embodiment is a cylindrical structure with a length of 1000mm and the inner and outer walls are of approximately the same thickness. To facilitate pneumatic clamping, the upper end is a cylindrical structure with an annular groove around its perimeter. With the help of a pneumatic release and gripping mechanism, the probe head 122 can be pneumatically disassembled. The lower end is a tapered detection end. The spacing between the lenses of the laser beam expander assembly is adjustable by a motor to change the laser focusing position, so that the laser focusing point moves away from the detection port 123 along the axis of the gun head by a certain distance.

[0044] See Figure 1 As shown, in this embodiment of the invention, the displacement unit 2 includes a lifting shaft 22 and an alignment shaft 21 connected in sequence. The lifting shaft 22 has a degree of freedom to move along the height direction and is a displacement actuator capable of driving the detection unit 1 to move along the detection direction. The alignment shaft 21 has a degree of freedom to move along the horizontal direction and is a displacement actuator capable of driving the detection unit 1 to move and align the probe head 122 between different working positions. The mounting position 23, the standby position 24, and the detection position 25 are arranged sequentially along the movement direction of the alignment shaft 21. The mounting position 23 houses the mounting unit 3, and the standby position 24 houses the receiving unit 4, which can accept discarded probes and fallen residue.

[0045] See Figure 3 and Figure 4 As shown in the embodiment of the present invention, the lifting shaft 22 includes a column 221, a lifting slide 222, a lifting rail 224, and a chain drive mechanism. The lifting rail 224 and the chain drive mechanism are arranged vertically on the column 221. The lifting slide 222 slides or rolls with the lifting rail 224, and the lifting slide 222 is connected to the chain drive mechanism, which provides power for the lifting of the lifting slide 222.

[0046] Specifically, the lifting slide 222 makes rolling contact with the lifting slide rail 224 set on the column 221 via pulley 223. The chain drive mechanism includes a chain 225, an upper sprocket 226, a lower sprocket 227, a lifting motor 228, a tension wheel 229, and a drive wheel 230. The upper sprocket 226 and the lower sprocket 227 are rotatably mounted on the upper and lower ends of the column 221, respectively. The lifting motor 228 is located in the middle of the column 221 and its output end is connected to the drive wheel 230. The two tension wheels 229 are rotatably mounted in the middle of the column 221 and are located on the upper and lower sides of the drive wheel 230, respectively. The chain 225 passes through the upper sprocket 226, the lower sprocket 227, the tension wheel 229, and the drive wheel 230, and finally connects to the lifting slide 222. Driven by the lifting motor 228, the chain 225 rotates, driving the lifting slide 222 to move up and down on the lifting slide rail 224. Position sensing sensors can also be set at different positions to achieve precise positioning. To better locate the molten steel level, the lifting shaft 22 can also be equipped with a liquid level sensing device in the form of laser, ultrasound, or visual sensing.

[0047] See Figure 3 As shown, in an embodiment of the present invention, the alignment shaft 21 includes a horizontal arm 211, a horizontal slide rail 212, a rack 213, a horizontal slide table 214, and a horizontal motor 215. One end of the horizontal arm 211 is connected to the lifting slide table 222. The horizontal slide rail 212 and the rack 213 are arranged parallel to each other on the horizontal arm 211. The horizontal slide table 214 is slidably engaged with the horizontal slide rail 212. The horizontal motor 215 is mounted on the horizontal slide table 214, and its output end meshes with the rack 213 via a gear. A detection unit 1 is installed on the horizontal slide table 214. The horizontal motor 215 drives the gear to rotate, thereby moving the horizontal slide table 214 and the detection unit 1 along the horizontal slide rail 212.

[0048] Referring to Figure 5, in an embodiment of the present invention, the upper gun unit 3 includes a closed housing 31, a gun head frame 33, a gun head support 35, and a rotary drive mechanism. The gun head frame 33 is rotatably disposed within the closed housing 31 and its bottom is connected to the rotary drive mechanism. The gun head frame 33 is used to store gun heads 122. The top of the closed housing 31 is provided with an openable gun door 32. The gun head support 35 is disposed at the bottom of the closed housing 31 and is coaxially disposed with the openable gun door 32. The gun head support 35 is used for sealing and inspecting the corresponding gun heads 122 on the gun head frame 33.

[0049] Referring to Figure 5, in an embodiment of the present invention, the gun head holder 33 includes an upper plate 331, a lower plate 332, a gun head groove 335, and a buffer structure 333. The upper plate 331 and the lower plate 332 are arranged parallel to each other vertically, and are connected by a plurality of gun head grooves 335 arranged circumferentially. Each gun head groove 335 is a hollow structure that runs vertically through the gun head, and a buffer structure 333 is provided on the bottom inner side of each gun head groove 335. The buffer structure 333 is used to support the gun head 122 placed in the gun head groove 335. When the gun head holder 33 rotates, the gun head groove 335 can move sequentially along the rotation direction to a position where the gun door 32 can be opened and closed.

[0050] Furthermore, the bottom of the gun head support 35 is connected to a pneumatic or electric actuator via an elastic floating structure. Driven by the pneumatic or electric actuator, the gun head support 35 can rise and fall along the axis of the gun head groove 335, allowing the gun head support 35 to compress during lifting, thereby limiting the squeezing force on the gun head 122. Force and displacement sensors can also be added to sense the downward lifting force.

[0051] Referring to Figure 6, in an embodiment of the present invention, the probe holder 35 includes a support plate 351, a standard sample block 352, a sealing ring 353, and a standard sample block rotation drive motor 354. The standard sample block rotation drive motor 354 is mounted on the support plate 351, and its output end is connected to the standard sample block 352. A sealing ring 353 is provided on the top of the standard sample block 352. The standard sample block 352 is not coaxially arranged with the center of the detection port 123 at the end of the probe 122. The sealing ring 353 is configured to achieve an airtight seal when the detection port 123 at the end of the probe 122 contacts the standard sample block 352. The standard sample block 352 is used to verify whether the installation position of the probe 122 at the end of the probe 12 in the detection unit 1 is accurate.

[0052] Specifically, the enclosed housing 31 is cylindrical, but can also be square or irregularly shaped as needed. An openable gun door 32 is provided on the enclosed housing 31 to expose the gun head 122. In this embodiment, the opening and closing of the gun door 32 is driven by a linkage mechanism propelled by a cylinder. A sliding structure for guiding the rotation of the gun head support 33 is also provided inside the enclosed housing 31. To accommodate the cylindrical shape of the enclosed housing 31, a double-layered disc structure consisting of an upper disc 331 and a lower disc 332 connected by an intermediate shaft is adopted. The rotation drive mechanism includes a gun head support rotation drive motor 34 and a transmission assembly. The gun head support rotation drive motor 34 is connected to the gun head support 33 through the transmission assembly, and drives the gun head support 33 to rotate around its central axis. Furthermore, this embodiment employs a cam indexer as a transmission component, enabling multi-station intermittent indexing motion where the gun head holder 33 rotates a certain angle before stopping and locking. This is configured so that when the gun head holder 33 rotates, the gun head slot 335 can move sequentially along the rotation direction to the position where the gun door 32 can be opened and closed. Alternatively, the intermittent indexing function can also be achieved using gears, chains, synchronous belts, or position sensing sensors. Around the disc axis of the gun head holder 33, multiple parallel cylindrical gun head slots 335, each capable of independently accommodating the gun head 122, are installed. To buffer the falling force when storing the gun head 122, a buffer structure 333 is also provided at the bottom of the gun head slot 335. Specifically, the buffer structure 333 consists of a buffer ring, a spring, and a buffer block, and the buffer structure 333 can float along the axial direction of the gun head slot 335. As another embodiment, in order to adapt to other shapes of the casing or to increase the capacity of the gun head 122, the gun head frame 33 can also be configured as a closed-shaped track and a recirculating flexible chain. The flexible chain can be realized by a flexible transmission structure such as a chain, plate chain, or belt. The gun head groove 335 is installed parallel to the flexible chain. Driven by the flexible chain, the gun head groove 335 can move sequentially along the direction of travel of the flexible chain to the position where the gun door 32 can be opened and closed.

[0053] Referring to Figure 7, in an embodiment of the present invention, the gun collecting unit 4 includes a guiding module 41, a crushing module 42, and a collecting box 43. The guiding module 41 is disposed on the top of the collecting box 43 and is used to guide the waste gun head into the collecting box 43. The crushing module 42 is disposed above the inside of the collecting box 43 and is used to crush the waste gun head that enters from the guiding module 41. The upper part of the collecting box 43 is provided with a track 431 and a push plate 432 that slides with the track 431. The push plate 432 is connected to a horizontal drive module, and the horizontal drive module drives the push plate 432 to move horizontally, pushing the debris in the collecting box 43 to flatten it.

[0054] Specifically, the upper part of the collection box 43 is a hollow drop groove that can accommodate and guide the drop gun head to fall. Below the axis of the drop gun groove, a periodic squeezing or biting crushing module 42 is set. The bottom of the collection box 43 is equipped with a movable slag collection box. The crushing module 42 is composed of several parallel and biting toothed rollers. The top of the crushing module 42 has an openable and closable cover. The push plate 432 is a long strip-shaped structure that spans the collection box 43.

[0055] The present invention provides an online steel composition detection system, the working principle of which is as follows:

[0056] During testing, the transverse motor 215 drives the gears to rotate, causing the transverse slide 214 to move along the transverse slide rail 212, thereby driving the detection unit 1 from the standby position 24 to the detection position 25. The laser beam expander focusing motor rotates to change the laser focusing position, moving the laser focus point away from the detection port 123 by a certain distance. The lifting shaft 22 drives the detection unit 1 to bring the gun head 122 close to the slag layer on the surface of the molten steel. After the laser focus point reaches the surface of the slag layer, it pauses for a few seconds as needed to emit a laser to detect the slag signal. When the gun head 122 is immersed in the molten steel, the laser focus point retracts to the vicinity of the detection port 123. The displacement unit 2 drives the gun head 122 of the detection unit 1 to immerse in the molten steel to a certain depth to begin composition detection; after the composition detection is completed, the displacement unit 2 drives the detection unit 1 to the standby position 24 and enters the standby state. When the probe head 122 reaches its predetermined lifespan, the probe 12 releases the probe head 122 via a pneumatic clamping structure. Under the action of thrust and gravity, the probe head 122 falls into the guide module 41 of the probe collection unit 4. The toothed roller rotates to crush the probe head 122. The crushed debris from the probe head 122 enters the crushing box 43. When a certain amount is reached, the pusher cylinder pushes the pusher plate 432, causing the pusher plate 432 to move along the track 431 to level the debris.

[0057] After the probe head 122 is removed, the displacement unit 2 drives the detection unit 1 to the upper probe position 23, and the cylinder pushes the linkage mechanism to open the closable probe door 32. The lifting shaft 22 lowers the height of the detection unit 1, aligning the probe 12 with the closable probe door 32. Under the lifting of the bottom cylinder, the probe head support 35 can move up and down along the axis of the probe head groove 335, and makes sealing contact with the detection port 123 of the probe head 122, raising the probe head 122. The sealing ring 353 is set to achieve airtight sealing when the detection port 123 contacts the standard sample block 352. After the probe head 122 is raised, the clamping end engages with the probe 12 to complete the installation. While the probe head support 35 is in the raised state, argon gas is filled into the probe 12. After reaching a certain pressure, the gas is exhausted. This process is repeated several times. During the filling process, the probe pressure is detected, calculated, analyzed, and the installation seal is verified. The standard sample block 352 is driven to rotate by a standard sample block rotation drive mechanism and is arranged non-coaxially with the center of the detection port 123 of the gun head 122. It excites and detects the standard sample on the standard sample block 352 of the gun head support 35 to verify the installation position of the detection unit 1 and the gun head 122. After the detection of the gun head 122 is completed, the displacement unit 2 drives the detection unit 1 to the standby position 24 and enters the standby state.

[0058] The present invention provides an online steel composition detection system that enables the system to maintain sealing, optical alignment, and calibration before and after gun replacement, allowing the system to operate stably and adapt to the actual steel smelting process and production rhythm; and enables the detection system to maintain sealing and quickly remove air from the gun head after gun head replacement, allowing the system to operate stably and adapt to the actual steel smelting process and production rhythm.

[0059] See Figures 1 to 7 As shown, another embodiment of the present invention provides a detection method using the online steel composition detection system as described in the above embodiment, comprising the following steps:

[0060] Displacement unit 2 drives detection unit 1 to move from standby position 24 to detection position 25;

[0061] Displacement unit 2 first drives detection unit 1 to approach the slag layer on the surface of molten steel, pauses for a few seconds as needed for detection, and emits laser to detect the slag signal;

[0062] Displacement unit 2 drives detection unit 1 to be immersed in molten steel to a set depth to begin composition detection;

[0063] After the component detection is completed, the displacement unit 2 drives the detection unit 1 to the standby position 24 and enters the standby state;

[0064] When the gun head 122 reaches its predetermined lifespan, the gun head 122 is removed and enters the gun collection unit 4, where the discarded gun head is collected.

[0065] After the gun head 122 is removed, the displacement unit 2 drives the detection unit 1 to the upper gun position 23, completing the installation of the gun head 122;

[0066] Verify the correct installation of detection unit 1 and gun head 122;

[0067] After the detection of the gun head 122 is completed, the displacement unit 2 drives the detection unit 1 to the standby position 24 and enters the standby state.

[0068] In embodiments of the present invention, verifying the correct installation of the detection unit 1 and the gun head 122 includes the following steps:

[0069] After the nozzle 122 is installed, the nozzle support 35 rises, and the standard sample block 352 contacts the detection port 123 of the nozzle 122 and is sealed by the sealing ring 353.

[0070] After the probe 12 is filled with argon gas and reaches the set pressure, it is then vented. The pressure of the probe 12 is checked and the installation seal is verified by repeating this process several times.

[0071] Excitation testing was performed on the standard sample block 352 to verify the correct installation of the detection unit 1 and the gun head 122.

[0072] This invention provides an online steel composition detection method that addresses the stability issues of system detection status and effectiveness before and after lance change in immersion molten steel detection methods. This includes issues related to airtightness and alignment during lance change in the refining process using LIBS technology. This invention maintains airtightness, optical alignment, and calibration before and after lance change, enabling the system to operate stably and adapt to the actual steel smelting process and production rhythm. Furthermore, it ensures that the detection system maintains airtightness and quickly removes air from the lance head after lance head replacement, allowing for stable system operation and adaptation to the actual steel smelting process and production rhythm.

[0073] The above description is merely an embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, extensions, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. An online steel composition detection system, characterized in that, It includes a detection unit, a displacement unit, a gun mounting unit, and a gun retraction unit. The detection unit is located on the displacement unit and includes a probe and a hollow probe gun mounted on the probe. The probe gun has a detachable gun head at its end. The laser emitted by the probe passes through the probe gun to detect the composition of molten steel online. The gun mounting unit is used for storing and installing gun heads. The gun retraction unit is used to collect discarded gun heads. The displacement unit is used to move the detection unit between the various operating units. The upper gun unit includes a closed housing, a gun head frame, a gun head holder, and a rotary drive mechanism. The gun head frame is rotatably mounted inside the closed housing and its bottom is connected to the rotary drive mechanism. The gun head frame is used to store the gun head. The top of the closed housing is provided with an openable and closable gun door. The gun head holder is located at the bottom of the closed housing and is coaxially arranged with the openable and closable gun door. The gun head holder is used for sealing and inspecting the corresponding gun head on the gun head frame. The gun head support includes an upper plate, a lower plate, a gun head slot, and a buffer structure. The upper and lower plates are arranged parallel to each other and are connected by multiple gun head slots arranged circumferentially. Each gun head slot is a hollow structure that runs vertically through the body, and a buffer structure is provided on the bottom inner side of each gun head slot to support the gun head placed in the gun head slot. When the gun head support rotates, the gun head slot can move sequentially along the rotation direction to the position where the gun door can be opened and closed. The bottom of the gun head support is connected to a pneumatic or electric actuator through an elastic floating structure, and is driven by the pneumatic or electric actuator to enable the gun head support to rise and fall along the axis of the gun head groove. The probe holder includes a support plate, a standard block, a sealing ring, and a standard block rotation drive motor. The standard block rotation drive motor is mounted on the support plate, and its output end is connected to the standard block. A sealing ring is provided on the top of the standard block. The standard block and the detection port at the end of the probe are not coaxially arranged. The sealing ring is designed to achieve an airtight seal when the detection port at the end of the probe contacts the standard block. The standard block is used to verify whether the probe installation position at the end of the probe in the detection unit is accurate.

2. The online steel composition detection system according to claim 1, characterized in that, The gun collection unit includes a guide module, a crushing module, and a collection box. The guide module is located at the top of the collection box and is used to guide the waste gun heads into the collection box. The crushing module is located inside the upper part of the collection box and is used to crush the waste gun heads that have entered from the guide module. The upper part of the collection box is provided with a track and a push plate that slides with the track. The push plate is connected to a horizontal drive module, which drives the push plate to move horizontally and flatten the debris in the collection box.

3. The online steel composition detection system according to claim 1, characterized in that, The displacement unit includes a lifting shaft and an alignment shaft connected in sequence, wherein the lifting shaft has a degree of freedom to move along the height direction, and the alignment shaft has a degree of freedom to move along the horizontal direction.

4. The online steel composition detection system according to claim 3, characterized in that, The lifting shaft includes a column, a lifting slide, a lifting rail, and a chain drive mechanism. The lifting rail and the chain drive mechanism are arranged vertically on the column. The lifting slide slide slides or rolls with the lifting rail, and the lifting slide is connected to the chain drive mechanism, which provides power for the lifting of the lifting slide. The alignment axis includes a horizontal arm, a horizontal slide rail, a rack, a horizontal slide table, and a horizontal motor. One end of the horizontal arm is connected to the lifting slide table. The horizontal slide rail and the rack are arranged parallel to each other on the horizontal arm. The horizontal slide table slides in conjunction with the horizontal slide rail. The horizontal motor is mounted on the horizontal slide table and its output end meshes with the rack through a gear. The detection unit is installed on the horizontal slide table.

5. A method for online detection of molten steel composition using the system described in claim 1, characterized in that, Includes the following steps: The displacement unit drives the detection unit to move from the standby position to the detection position; The displacement unit first drives the detection unit to approach the slag layer on the surface of the molten steel, pauses for a few seconds as needed for detection, and then emits a laser to detect the slag signal. The displacement unit drives the detection unit to immerse itself in the molten steel to a set depth to begin composition detection; After the component detection is completed, the displacement unit drives the detection unit to the standby position and enters the standby state; When the nozzle reaches its predetermined lifespan, it is removed and placed into the nozzle collection unit, which collects the discarded nozzles. After the gun head is removed, the displacement unit drives the detection unit to the gun mounting position, completing the installation of the gun head; Verify the correct installation of the detection unit and the gun head; After the gun head detection is completed, the displacement unit drives the detection unit to the standby position and enters the standby state.

6. The online steel composition detection method according to claim 5, characterized in that, The verification of the correct installation of the detection unit and the gun head includes the following steps: After the nozzle is installed, the nozzle support rises, the standard sample block contacts the detection port of the nozzle, and is sealed by the sealing ring; After the probe is filled with argon gas and reaches the set pressure, it is then vented. This process is repeated several times to check the pressure of the probe and verify the sealing of the installation. Excitation testing was performed on the standard sample block to verify the correct installation of the testing unit and the gun head.

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