Temperature measuring and sampling device for argon blowing station

Abstract

The utility model discloses a kind of argon blowing station temperature measuring sampling devices, including protective cylinder, sampling assembly is installed in protective cylinder;Sampling assembly includes sampling cylinder, the upper section of sampling cylinder is containing pipe, lower section is sampling pipe, sampling pipe is used to be inserted into molten steel when sampling;Containing pipe is also provided with piston;The top of piston is connected with connecting plate by piston rod;Connecting plate is also connected with driving assembly, driving assembly is used to sequentially drive piston to move in upper section by connecting plate and piston rod, to introduce molten steel into containing pipe;The utility model can sample molten steel by sampling assembly, realize heat insulation protection etc. by protective cylinder, increase the installation protection of operating personnel, improve the safety of sampling operation;By installing piston assembly on protective cylinder, the sampling amount of molten steel can also be fine controlled.

Description

Technical Field

[0001] This utility model belongs to the technical field of molten steel sampling equipment, and in particular relates to a temperature measurement and sampling device for an argon blowing station. Background Technology

[0002] In steel metallurgical production, the argon blowing station is one of the key links in steel refining. By blowing argon into the molten steel, it can achieve functions such as stirring, homogenizing composition and temperature, and removing inclusions. The temperature and composition of the molten steel are key parameters that determine the quality of refining and need to be monitored in real time and accurately.

[0003] Argon blowing stations in steel plants are currently in a phase where manual operation and automation coexist while the technology is being upgraded towards intelligent systems. In some small and medium-sized steel plants or older production lines, due to limitations such as cost and the difficulty of production line renovation, temperature sampling at argon blowing stations still relies on manual operation. Operators manually load and unload probes and insert handheld temperature sampling guns into molten steel to complete the operation. These types of devices rely entirely on experience for operation.

[0004] With the advancement of smart steelmaking, more and more steel mills are introducing automated temperature measurement and sampling robots. For example, the intelligent detection and temperature measurement sampling robot for ladle lining is equipped with components such as a robotic arm, laser sensing probe, and infrared thermometer. It can automatically complete operations such as ladle positioning, temperature measurement and sampling, and probe replacement. However, such devices are expensive. Utility Model Content

[0005] The purpose of this invention is to provide a temperature measurement and sampling device for an argon blowing station, which improves the safety of sampling operations while controlling the cost of the sampling device.

[0006] The present invention adopts the following technical solution: a temperature measurement and sampling device for an argon blowing station, comprising a protective cylinder, wherein a sampling component is installed inside the protective cylinder; The sampling assembly includes a sampling tube, the upper section of which is a receiving tube and the lower section is a sampling tube. The sampling tube is used to extend into the molten steel during sampling. A piston is also installed inside the receiving tube; A connecting plate is connected to the top of the piston via the piston rod; The connecting plate is also connected to a drive assembly, which is used to drive the piston to move in the upper section in sequence through the connecting plate and the piston rod, so as to introduce molten steel into the receiving pipe.

[0007] The beneficial effects of this utility model are: this utility model can sample molten steel through a sampling component, and achieve heat insulation protection through a protective cylinder, thereby increasing the safety protection of operators and improving the safety of sampling operations; by installing a piston component inside the protective cylinder, the amount of molten steel sampled can also be precisely controlled. Attached Figure Description

[0008] Figure 1This is a schematic diagram of the structure of an argon blowing station temperature measurement and sampling device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the back structure of an argon blowing station temperature measurement and sampling device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the drive assembly and protective cylinder in an embodiment of the present invention; Figure 4 This is a schematic diagram of the position adjustment component and the protective cylinder in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the driving component and the sampling component in the embodiment of this utility model; Figure 6 This is a cross-sectional structural schematic diagram of a temperature measurement and sampling device for an argon blowing station according to an embodiment of the present invention.

[0009] Wherein: 100. Protective cylinder; 110. Mounting cylinder; 120. Control panel; 130. First sealing ring; 140. Mounting groove; 150. Guide groove; 200. Sampling component; 210. Drive assembly; 211. Lifter; 212. Connecting plate; 213. Piston rod; 214. Piston; 215. Sealing ring; 220. Sampling cylinder; 221. Sampling tube; 222. Fixing ring; 223. Limiting ring; 224. Limiting plate; 225. Expansion joint; 226. Thermocouple; 227. Guide slider; 228. Through hole; 229. Second sealing ring. Detailed Implementation

[0010] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0011] In the iron and steel metallurgical production process, the argon blowing station is a crucial link in steel refining, requiring real-time monitoring of the steel's temperature and composition. Traditional temperature sampling methods often rely on manual, handheld devices, posing safety hazards such as operators being in close contact with high-temperature molten steel and susceptible to splash injuries. Furthermore, the sampling depth is difficult to control precisely, resulting in insufficient sample representativeness, and inadequate contact between the temperature sensing element and the molten steel also affects data accuracy. In addition, the lack of a stable support structure and sealing design leads to poor equipment stability and susceptibility to external interference, failing to meet the stringent requirements of modern metallurgical processes for high safety and high-precision data acquisition.

[0012] This utility model discloses a temperature measurement and sampling device for an argon blowing station, such as... Figure 1As shown, the device includes a protective cylinder 100, inside which a sampling assembly 200 is installed. The sampling assembly 200 includes a sampling cylinder 220, the upper section of which is a receiving tube and the lower section is a sampling tube 221. The sampling tube 221 is used to extend into the molten steel during sampling. A piston 214 is also provided inside the receiving tube. The top of the piston 214 is connected to a connecting plate 212 via a piston rod 213. The connecting plate 212 is also connected to a driving assembly 210, which is used to drive the piston 214 to move in the upper section via the connecting plate 212 and the piston rod 213 in sequence, so as to introduce molten steel into the receiving tube.

[0013] This utility model can sample molten steel using the sampling component 200, and use the protective cylinder 100 to achieve heat insulation and protection, thereby increasing the safety of operators and improving the safety of sampling operations; by installing a piston component on the protective cylinder 100, the amount of molten steel sampled can also be precisely controlled.

[0014] This embodiment achieves safe isolation and controllable sampling of high-temperature molten steel through the coordinated layout of the protective cylinder 100 and the built-in sampling component 200, thereby improving operational safety and sample collection reliability. The protective cylinder 100, as the main structural support, encloses and protects the internal sampling component 200. Made of high-temperature resistant alloy material, it possesses excellent thermal barrier properties and mechanical strength, enabling long-term stable operation in the high-temperature environment of the argon blowing station, exceeding 1600°C. The protective cylinder 100 is vertically arranged, with an internal space for the sliding installation of the sampling component 200, ensuring axial guidance during the sampling process.

[0015] The sampling assembly 200 is located inside the protective cylinder 100 and mainly includes the sampling cylinder 220 and its auxiliary structures. The sampling cylinder 220 is a hollow cylindrical component, divided into two functional sections along the axial direction: the upper section is a receiving tube, used to form a sealed cavity to contain the sucked-in molten steel sample; the lower section is a sampling tube 221, specifically used to extend below the surface of the molten steel during the sampling stage to complete the sampling action. The sampling tube 221 has a small outer diameter, which facilitates insertion into the molten steel without disturbing the flow field of the molten pool. Its end can be flat or beveled to optimize the sampling efficiency. The receiving tube and the sampling tube 221 are integrally formed structures.

[0016] A piston 214 is installed inside the receiving tube. This piston 214 can slide axially back and forth within the receiving tube. To maintain a seal, a sealing ring 215 is also provided on the outside of the piston 214. The outer circumference of the sealing ring 215 maintains a sliding seal with the inner wall of the receiving tube to prevent molten steel leakage or gas leakage. The top of the piston 214 is connected to the connecting plate 212 above it through a piston rod 213. The piston rod 213 passes through the top opening of the receiving tube and achieves a dynamic seal through a sealing structure, allowing it to effectively prevent external contaminants from entering during lifting and lowering.

[0017] The connecting plate 212 is a plate-shaped connector, fixedly connected to the top of the piston rod 213, and used to transmit driving force. The connecting plate 212 is further connected to the drive assembly 210, which can be in the form of an electric push rod, a pneumatic cylinder, a hydraulic cylinder, or a servo motor with a transmission mechanism, capable of outputting stable linear motion. When the drive assembly 210 is started, its output force is transmitted to the piston rod 213 through the connecting plate 212, thereby driving the piston 214 to move up and down inside the receiving tube. When the piston 214 moves upward, a negative pressure environment is formed inside the receiving tube and the sampling tube 221, causing molten steel to be drawn in from the bottom opening of the sampling tube 221, completing the sampling action; conversely, pushing the piston 214 downward can discharge the collected molten steel sample, realizing the discharge function.

[0018] The protective cylinder 100 provides a physical barrier for the entire system, ensuring operational safety; the sampling cylinder 220 serves as the sampling execution unit, and its structural partitioning design achieves functional decoupling; the piston 214 and the drive assembly 210 constitute an active suction mechanism, replacing the traditional passive immersion sampling method and improving the controllability and repeatability of sampling; the piston rod 213 and the connecting plate 212 together form a force transmission path, ensuring that the driving action is accurately transmitted to the piston 214.

[0019] The above technical solution enables non-contact, controllable temperature sampling of molten steel in high-temperature and high-risk environments. Thanks to the protective cylinder 100, operators can complete the operation without approaching the molten steel area, significantly reducing the risk of burns. The drive assembly 210 moves the piston 214, achieving active control of molten steel intake, avoiding fluctuations in sample volume due to differences in human experience, and improving sample consistency and representativeness. The segmented design of the sampling cylinder 220 makes the structure compact and functionally clear; the enclosed space formed by the containing tube helps maintain sample purity and reduces the possibility of external contamination.

[0020] In addition, a control panel 120 is installed on the outside of the protective cylinder 100. The entire device can be controlled by the control panel 120 to adjust the driving parameters to adapt to the sampling requirements under different working conditions. It can also be applied to other industrial scenarios that require liquid sampling in harsh environments, such as non-ferrous metal smelting and scrap steel recycling.

[0021] In one embodiment, the drive assembly 210 includes a lifter 211; the side of the protective cylinder 100 is provided with a mounting cylinder 110 for mounting the lifter 211; the top of the lifter 211 is connected to the connecting plate 212.

[0022] Specifically, such as Figure 3As shown, the lifting device 211 in the drive assembly 210 serves as an actuator, capable of linear reciprocating motion. This motion can be achieved using a power device with stable output force and controllable stroke, such as an electric push rod, hydraulic cylinder, or pneumatic cylinder. The lifting device 211 is located on the side of the protective cylinder 100 and is fixedly installed using a specially designed mounting cylinder 110. The mounting cylinder 110 has a hollow structure, and its inner wall shape is adapted to the outer contour of the lifting device 211, ensuring that the lifting device 211 maintains a stable spatial position during operation and preventing loosening or damage due to vibration or uneven load. The mounting cylinder 110 can be fixed to the outer wall of the protective cylinder 100 by welding or bolting.

[0023] The top of the lifting device 211 is provided with a connecting end, which is directly connected to the connecting plate 212 to form a rigid or elastic connection structure. When a rigid connection is used, the end of the telescopic rod of the lifting device 211 can be firmly fixed to the connecting plate 212 through a flange or pin structure to ensure efficient and reliable power transmission. When it is necessary to buffer impact loads, an elastic pad or ball joint structure can also be set at the connection to absorb the instantaneous stress fluctuations that may occur during the sampling process. The connecting plate 212 serves as an intermediate component for force transmission, with its two ends connected to the piston rod 213 and the lifting device 211, respectively, forming a complete drive chain: after the lifting device 211 is started, its telescopic movement pushes or pulls the connecting plate 212 to move vertically, which in turn drives the piston 214 to slide up and down in the receiving tube of the sampling cylinder 220 through the piston rod 213, thereby controlling the process of molten steel entering or exiting the receiving tube.

[0024] In an optional embodiment, the lifter 211 can be replaced by a combination of a servo motor and a lead screw and nut mechanism, which converts rotational motion into precise linear displacement to achieve higher-precision position control. In this case, the mounting cylinder 110 is adjusted accordingly to adapt to the integrated structure of the lead screw support and the guide rail. In addition, the number of lifters 211 is not limited to a single configuration; there can also be two or more arranged side by side at different lateral positions of the protective cylinder 100 to improve the overall drive balance and load capacity, and prevent the sampling cylinder 220 from tilting or jamming due to single-point force.

[0025] The sleeve 110 provides a stable mounting reference surface and mechanical support environment for the lifting device 211, enabling it to operate for a long time without displacement or deformation under frequent start-stop and heavy load conditions; the output end of the lifting device 211 establishes a reliable mechanical connection with the connecting plate 212 to ensure that the driving force is accurately transmitted to the piston system; the connecting plate 212, as a linkage component, coordinates the synchronization of the actions of multiple drive sources (if there are multiple sets of lifting devices) and evenly distributes the external driving force to the piston rod 213, reducing local stress concentration.

[0026] Through the above technical solution, the specific structure of the drive component 210 is optimized. Because a dedicated mounting cylinder 110 is used to fix the lifting device 211, the drive unit possesses good structural stability and maintainability, allowing for quick disassembly and replacement during equipment maintenance without the need to disassemble the entire protective cylinder 100. Simultaneously, the direct connection between the lifting device 211 and the connecting plate 212 simplifies the transmission path, reduces energy loss, and improves response speed and control accuracy. Therefore, this design effectively solves the problems of unstable drive structure installation, low force transmission efficiency, and inconvenient maintenance in existing technologies, providing a reliable guarantee for the smooth execution of sampling actions.

[0027] As a specific implementation, the bottom of the protective cylinder 100 is provided with a downward-facing mounting groove 140, and an expansion joint 225 is installed in the mounting groove 140; the moving part of the expansion joint 225 is connected to the sampling cylinder 220.

[0028] By incorporating an installation groove and a built-in expansion joint at the bottom of the protective cylinder, active adjustment and dynamic fixation of the axial position of the sampling cylinder are achieved, improving the operational stability of the device under high temperature and strong disturbance conditions. The expansion joint, as a movable actuator, can generate linear or push-pull movements in response to control signals. Its moving parts (such as piston rods or push rods) are directly or indirectly connected to the sampling cylinder 220, thereby enabling fine-tuning or locking of the sampling cylinder's position. The installation groove 140 provides embedded installation space for the expansion joint 225, ensuring that its overall structure does not protrude beyond the bottom surface of the protective cylinder, avoiding interference with external structures during equipment lifting and lowering. This also helps maintain the compactness and streamlined shape of the device, facilitating flexible deployment within the confined operating area of ​​the argon blowing station.

[0029] The mounting groove 140 at the bottom of the protective cylinder 100 is a downward-opening cavity structure, evenly distributed circumferentially along the bottom edge area of ​​the protective cylinder. The internal contour of the groove matches the shape of the expansion joint 225, ensuring stable installation and facilitating later maintenance and replacement. The downward-facing opening of the mounting groove 140 facilitates drainage, slag removal, and prevents dust accumulation, while also providing operational convenience for the installation and maintenance of the expansion joint 225.

[0030] The expansion joint 225 can be equipped with linear drive components such as hydraulic cylinders, pneumatic cylinders, or electric push rods. Its working medium can be selected from clean gas, hydraulic oil, or electric drive depending on the site conditions, offering advantages such as fast response speed, high positioning accuracy, and controllable output force. The expansion joint 225 is fixedly installed within the mounting groove 140 and can be assembled via bolts, welding, or clamps to ensure it does not loosen under vibration. The moving part of the expansion joint 225 refers to its extendable output component, such as a piston rod or lead screw, which can extend or retract axially under driving action. This moving part is connected to the outer wall or connecting component of the sampling cylinder 220 via mechanical connectors (such as hinges, flanges, or U-clamps), thereby transmitting the driving force to the sampling cylinder 220.

[0031] The sampling cylinder 220, as the core component for temperature measurement and sampling, is slidably installed inside the protective cylinder 100 and can move up and down under the action of the lifting mechanism to adjust the depth of insertion into the molten steel. When the sampling cylinder 220 reaches the predetermined working position, the telescopic device 225 actuates, and its moving part pushes or pulls the sampling cylinder to achieve secondary correction or rigid fixation of its axial position. This design effectively suppresses the shaking of the sampling cylinder caused by the impact of molten steel flow, electromagnetic stirring, or vibration of the equipment itself, and improves the repeatability and consistency of temperature measurement and sampling.

[0032] As an optional implementation, the number of expansion joints 225 can be two, three, or four, preferably an even number, and arranged symmetrically in a circular pattern at the bottom of the protective cylinder 100 to ensure balanced force application and prevent the sampling cylinder from jamming or tilting due to eccentric force. Each expansion joint 225 can be controlled independently or synchronously, and can be adjusted step by step or locked as a whole as needed.

[0033] As another variant, the shape of the mounting groove 140 can be designed as a rectangular, circular, or polygonal cross section according to the shape of the expansion joint. The groove depth should be sufficient to accommodate the main body of the expansion joint and leave installation margin. A sealing cover or protective cover can be added at the groove opening to prevent molten steel from splashing into the groove and causing blockage or corrosion.

[0034] Furthermore, the connection between the moving part and the sampling cylinder 220 can be either a rigid connection or an elastic connection. A rigid connection is suitable for applications requiring high-rigidity positioning and can effectively resist external disturbances; an elastic connection can absorb some of the impact energy by setting buffer pads or spring elements, reducing stress concentration and extending the service life of the component.

[0035] The mounting slot 140 provides a reliable mounting base for the expansion joint 225. The expansion joint 225 applies a controllable force to the sampling cylinder 220 through the moving part, so that the sampling cylinder obtains additional axial constraint after the main lifting system completes the positioning, thereby enhancing the dynamic stability of the overall system.

[0036] After the sampling tube 220 is initially positioned, the expansion joint 225 installed at the bottom is used for axial fine-tuning or clamping and fixing, which significantly improves the anti-interference ability of the device in complex metallurgical environments. The concealed layout of the installation slot not only optimizes the overall structure of the equipment, but also avoids the risk of external collisions. This structure is particularly suitable for scenarios where there is strong molten steel disturbance in the argon blowing station, effectively solving the problems of temperature measurement deviation and sampling failure caused by the shaking of the sampling tube, and ensuring the accuracy of data acquisition and the safety of operation.

[0037] In addition, a guide slider 227 is provided on the outer wall of the sampling cylinder 220; the inner wall of the protective cylinder 100 has a guide groove 150 that runs vertically and cooperates with the guide slider 227.

[0038] Among them, such as Figure 5 As shown, the guide slider 227 is a protruding structure fixedly mounted on the outer wall of the sampling cylinder 220. It extends axially along the sampling cylinder and provides radial limiting during lifting. The guide slider 227 can be made of high-temperature resistant and wear-resistant metal materials, such as stainless steel or nickel-based alloys, to adapt to the high-temperature and corrosive working environment of the argon blowing station. Its cross-sectional shape can be rectangular, trapezoidal, or semi-circular, with a trapezoidal shape being preferable for ease of assembly and enhanced resistance to lateral forces. The number of guide sliders 227 can be configured according to actual force requirements; at least one slider can be provided, and two or four can be symmetrically arranged to achieve force balance and motion stability.

[0039] The guide groove 150 is an elongated groove structure formed on the inner wall of the protective cylinder 100, extending strictly vertically to form a sliding fit with the guide slider 227. The inner surface of the guide groove 150 is precision machined to ensure that the surface roughness is controlled within a reasonable range, reducing frictional resistance and preventing jamming. The cross-sectional profile of the guide groove 150 matches the guide slider 227, for example, it is designed as a dovetail groove structure corresponding to a trapezoidal slider, or a right-angle groove structure corresponding to a rectangular slider, thereby effectively restricting the horizontal freedom of movement of the sampling cylinder 220, allowing it to only perform linear reciprocating motion along a preset trajectory.

[0040] The aforementioned guide slider 227 and guide groove 150 form a sliding pair. During assembly, they maintain an appropriate clearance to ensure smooth movement while preventing wobbling due to excessive looseness. During operation, as the expansion joint 225 moves the sampling cylinder 220 up and down, the guide slider 227 remains embedded within the guide groove 150 and slides along its length, thereby forcibly constraining the movement path of the sampling cylinder and preventing it from deflecting, tilting, or lateral swaying during insertion into molten steel or lifting.

[0041] When the sampling cylinder 220 moves up and down within the protective cylinder 100, the movement of the sampling cylinder 220 is strictly limited to the vertical direction due to the synergistic effect of the guide slider 227 and the guide groove 150, which significantly improves its straightness and repeatability. This structure effectively suppresses radial offset caused by molten steel impact, equipment vibration or gravity eccentricity, and reduces the risk of local wear and stress concentration between guide components. The overall system rigidity is enhanced, ensuring the stability and reliability of the temperature measurement and sampling process, and is especially suitable for metallurgical working conditions with high-frequency operation and long-term continuous operation.

[0042] In order to measure the temperature of molten steel, the inner wall of the sampling cylinder 220 is provided with a mounting groove for installing thermocouple 226, and thermocouple 226 is installed in the mounting groove.

[0043] This technical solution provides structural support for the arrangement of temperature sensing elements by setting a dedicated mounting groove on the inner wall of the sampling cylinder 220, thereby achieving efficient and stable monitoring of molten steel temperature. The mounting groove serves as an embedded fixing channel for the thermocouple 226, and its position on the inner wall of the sampling cylinder 220 near the sampling area ensures that the temperature-sensing end of the thermocouple 226 can fully contact the high-temperature molten steel or be in a high-temperature conduction path, thus improving the temperature measurement response speed and accuracy. The cross-sectional shape of the mounting groove can be adapted to the geometry of the thermocouple 226 shell, for example, using a rectangular, U-shaped, or semi-circular groove structure to facilitate the insertion and positioning of the thermocouple 226; the groove depth should be sufficient to accommodate the temperature-sensing section of the thermocouple 226, and a reserved sealing and filling space should be provided to prevent damage to the element caused by molten steel seepage or high-temperature gas impact.

[0044] A removable cap or high-temperature sealing layer can be installed at the slot opening for secondary sealing after the thermocouple 226 is installed, enhancing splash resistance and heat insulation performance. Furthermore, the number of mounting slots is not limited to one; multiple slots can be set according to actual temperature measurement needs, distributed circumferentially or axially along the inner wall of the sampling cylinder 220 to form a multi-point temperature measurement layout. This is suitable for temperature field acquisition at different depths or in different areas, improving data representativeness.

[0045] In one embodiment, such as Figure 4 As shown, a fixing ring 222 is installed on the moving part; a limiting plate 224 is provided at intervals on the upper and lower parts of the sampling cylinder 220, and an annular space is formed between the limiting plates 224; the fixing ring 222 is installed in the annular space.

[0046] A mechanical clamping connection structure is installed between the moving part of the expansion joint 225 and the sampling cylinder 220 to reliably lock the position of the sampling cylinder 220. The fixing ring 222, as a transmission intermediate component, is installed on the moving part of the expansion joint and can move synchronously with it. The outer wall of the sampling cylinder 220 is provided with vertically spaced limiting plates 224, which together form an annular space to accommodate the fixing ring 222. When the expansion joint moves, the moving part axially clamps and fixes the sampling cylinder through the fixing ring 222, thereby preventing it from moving vertically during molten steel impact or equipment vibration.

[0047] In practical applications, the fixed ring 222 can also be replaced with a split clamp structure, which can be quickly assembled and disassembled through elastic pre-tightening or pneumatic drive, improving the convenience of maintenance.

[0048] The limiting plates 224 consist of two independently arranged arc-shaped plate structures, fixed to the upper and lower parts of the outer wall of the sampling cylinder 220, respectively. They maintain a certain axial distance, forming an arc-shaped space with a rectangular or trapezoidal cross-section. The width of this space is slightly larger than the axial thickness of the fixing ring 222 to ensure that the fixing ring 222 can be smoothly embedded and clamped. The limiting plates 224 are fixed to the outer wall of the sampling cylinder 220 by welding or bolting, possessing sufficient structural rigidity to withstand the clamping force from the fixing ring 222 and external disturbance forces. As an optional implementation, the limiting plates 224 can also be designed as an adjustable structure, for example, by adjusting the distance between the two plates through threaded engagement to accommodate fixing rings 222 of different sizes, enhancing the versatility of the device.

[0049] The telescopic member 225 provides power output, the moving part transmits displacement, and the fixed ring 222 and the limiting plate 224 serve as positioning reference structures on the clamped object, together forming a complete mechanical locking mechanism. This structure does not rely on friction to maintain stability alone, but achieves rigid fixation through geometric limiting, thus having higher anti-interference ability and long-term reliability, and is especially suitable for long-term use in metallurgical environments with high temperature, high humidity, and strong vibration.

[0050] During molten steel sampling, the sampling cylinder 220 needs to remain stationary at a specific depth to ensure sample representativeness and temperature measurement accuracy. Without effective fixing measures, it is easily displaced by the impact of the molten steel flow or equipment vibration, leading to sampling failure or data deviation. This embodiment, through the combination of a fixing ring and a limiting plate, achieves reliable fixing of the sampling cylinder using mechanical limiting, avoiding sampling errors caused by loosening or slippage, improving the stability and repeatability of the device, while also being simple in structure and easy to maintain, meeting the needs of efficient and safe operation in industrial settings.

[0051] Specifically, there are at least two expansion joints 225, which are arranged circumferentially on the protective cylinder 100; the moving parts of at least two expansion joints 225 are connected to the same fixed ring 222.

[0052] This embodiment employs a structural design in which multiple expansion joints 225 are evenly arranged around the circumference of the protective cylinder, and their moving parts are connected together to the same fixed ring 22. This achieves enhanced stability and balanced force distribution in fixing the position of the sampling cylinder 220. This technique effectively solves the problems of uneven force distribution and unreliable fixation of the sampling components caused by single-point drive or asymmetrical layout under high temperature and strong vibration conditions, thereby improving the structural robustness and positioning accuracy of the device during operation.

[0053] like Figure 2 As shown, the number of expansion joints 225 is at least two, and the specific number can be adaptively adjusted according to the overall size of the protective cylinder 100, the weight of the sampling component 200, and the working load. For example, in a miniaturized device, two expansion joints 225 can be symmetrically distributed; in scenarios with large loads or high stability requirements, three or four expansion joints can be evenly arranged along the outer periphery of the protective cylinder 100 to form a symmetrical support structure. The expansion joints 225 can be linear actuators such as hydraulic cylinders, pneumatic cylinders, or electric push rods. Their installation direction is axially perpendicular to the central axis of the protective cylinder 100, or they can be inclined according to the spatial layout requirements, as long as the thrust / pull force output by the moving part can be effectively transmitted to the fixed ring 222. The cylinder part of the expansion joint 225 is fixedly installed in the mounting groove provided at the bottom of the protective cylinder 100 to achieve embedded integration and avoid interference or damage caused by external protrusion.

[0054] "Circular arrangement" refers to the distribution of each expansion joint 225 in a ring-shaped symmetrical or approximately symmetrical manner around the central axis of the protective cylinder 100. This ensures that the forces applied by each expansion joint 225 cancel each other out radially, thereby preventing the fixed ring 222 from deflecting or twisting during movement. For example, when using three expansion joints, they can be evenly distributed at a 120° angle; four can be evenly distributed at 90°. This layout not only improves the dynamic balance capability of the system but also enhances its resistance to lateral disturbances, making it suitable for flow field fluctuation environments caused by molten steel stirring in argon blowing stations.

[0055] The moving part refers to the portion of the telescoping device 225 that can extend or retract relative to the cylinder body, such as the moving end of the piston rod or the lead screw nut mechanism, whose end is directly or indirectly connected to the fixed ring 222. The connection method can be welding, threaded connection, pin hinge, or clamp fixation, the purpose of which is to ensure the reliability and synchronization of power transmission. The moving parts of multiple telescoping devices 225 are all connected to the same fixed ring 222, so that all driving forces are concentrated on the annular component, and then the constraint force is evenly applied between the limiting plates 224 set outside the sampling cylinder 220 through the fixed ring 222 (see specific embodiment 6), thereby locking the axial position of the sampling cylinder.

[0056] The retaining ring 222 is a ring-shaped metal structure with an inner diameter slightly larger than the outer diameter of the sampling cylinder 220, so that it can be fitted onto the outside of the sampling cylinder and cooperate with the annular space formed by the upper and lower limiting plates 224. Its material can be high-temperature resistant alloy steel or stainless steel, possessing sufficient strength and creep resistance to withstand mechanical stress under long-term repeated loading. As a force convergence node for multi-point drive, the retaining ring 222 undertakes the key function of integrating the dispersed driving forces into a unified clamping action.

[0057] The connections between the aforementioned components constitute a distributed drive-centralized execution mechanical transmission path: multiple expansion joints 225 move synchronously → moving parts push / pull → fixed ring 222 and limiting plate 224 cooperate to transmit force → achieving position fixation of sampling cylinder 220. This collaborative mechanism ensures that the sampling cylinder will not shift due to the impact of molten steel flow, equipment vibration, or thermal deformation after it has been raised and lowered to the correct position, significantly improving the stability of temperature measurement and sampling.

[0058] In one embodiment, the sampling tube 221 is a frustum-shaped tube that is larger at the top and smaller at the bottom, and has several inlet holes on the tube wall.

[0059] This technical solution optimizes the steel inflow path and sampling efficiency, and improves the stability and representativeness of the sampling process by designing the sampling tube as a frustum structure with a larger top and smaller bottom, and setting multiple liquid inlet holes in the tube wall. The sampling tube 221, as a key component that directly contacts the molten steel and achieves liquid collection, has a decisive influence on sampling performance due to its geometry and fluid channel layout. The frustum structure refers to the sampling tube being a truncated cone shape, with the diameter gradually decreasing from top to bottom, forming a tapered shape. This shape helps guide the molten steel to flow smoothly along the tube wall, reducing flow resistance and avoiding eddies or local high-pressure areas caused by abrupt changes in cross-section. Simultaneously, this structure plays a role in slag breaking during insertion into the molten steel, facilitating penetration of the slag layer on the molten steel surface and ensuring that the sampling location is within the effective melt region. Several liquid inlet holes are evenly distributed at different heights along the circumferential and axial directions of the sidewall of the sampling tube 221, forming a multi-point liquid inlet channel, expanding the sampling inlet area, increasing the liquid inflow rate per unit time, and thus shortening the sampling response time. These inlet holes not only serve as channels for molten steel to enter the sampling cylinder 220, but also play a role in filtering large particulate impurities to a certain extent, reducing the risk of blockage.

[0060] The protective cylinder 100 has a central hole at its top, and a first sealing ring 130 is installed on the central hole. The first sealing ring 130 slides and seals against the piston rod 213. Figure 6 As shown, the top of the sampling cylinder 220 has a through hole 228, and a second sealing ring 229 is installed on the through hole 228. The second sealing ring 229 slides and seals with the piston rod 213.

[0061] The central hole at the top of the protective cylinder 100 is a through-hole structure that penetrates its top wall, providing a guide channel for the piston rod 213 to reciprocate up and down. The axis of this central hole is aligned with the direction of movement of the piston rod 213, ensuring that the piston rod 213 remains stably aligned during lifting and lowering, avoiding off-center loading or jamming. A first sealing ring 130 is installed inside the central hole. This first sealing ring 130 is made of a high-temperature resistant, wear-resistant, and highly elastic material, while maintaining good resilience and sealing performance. The first sealing ring 130 is fixed in the central hole by an interference fit or an embedded groove structure. Its inner edge forms a dynamic sliding seal connection with the outer circumference of the piston rod 213, continuously adhering to the piston rod 213 as it moves up and down, effectively preventing molten steel vapor, splashes, and external air from entering the drive area inside the protective cylinder along the piston rod path.

[0062] The sampling cylinder 220 has a through hole 228 at its top, located at the center of the top of the receiving tube section of the sampling cylinder 220, which also serves as a channel for the piston rod 213 to pass through. Around the through hole 228 is an annular groove or stepped structure for installing a second sealing ring 229. The second sealing ring 229 is installed in the same or similar manner as the first sealing ring 130 to achieve a sliding seal with the piston rod 213. The second sealing ring 229 is also made of a high-temperature resistant elastomer material, which can be the same as the material of the first sealing ring 130 to ensure the consistency and maintainability of the system's sealing performance. The function of the second sealing ring 229 is to prevent molten steel or high-temperature gas from leaking upwards from inside the sampling cylinder to the area where the connecting plate 212 and drive assembly 210 are located, and also to prevent external contaminants from entering the sampling chamber from above, ensuring the purity of the sampling process.

[0063] The two sealing structures are respectively located at the interface positions of the protective cylinder 100 and the sampling cylinder 220 at two different levels, jointly forming a double sliding sealing system around the piston rod 213. The first sealing ring 130 mainly serves to isolate the external environment from the driving space, protecting precision electrical components such as the lifting device 211 from high-temperature corrosion and physical damage; the second sealing ring 229 focuses on maintaining the airtightness of the sampling environment inside the sampling cylinder 220, preventing sample oxidation or compositional changes. The two are spatially distributed vertically, arranged sequentially along the axial direction of the piston rod 213, forming a stepped protective barrier, which significantly improves the sealing reliability of the overall device under extreme operating conditions.

[0064] The moving part is provided with limit rings 223 at intervals, and the two limit rings 223 clamp the fixed ring 222 from the upper and lower end faces of the fixed ring 222 respectively.

[0065] The above technical solution achieves a reinforced design for the connection structure between the moving part and the fixed ring of the expansion joint. This design improves the reliability of the sampling cylinder's position locking during the lifting process by applying axial constraints to the fixed ring, preventing fixation failure due to vibration, impact, or operational deviation, thereby ensuring the safety and stability of temperature sampling operations.

[0066] The moving component is the movable output part of the telescopic device 225. It performs linear reciprocating motion along the axial direction to transmit driving force to move the fixed ring 222 up and down. During operation, the moving component must maintain a stable connection with the fixed ring 222 to prevent relative slippage. The limiting rings 223 are annular components, set on the moving component, with two arranged at axial intervals to form an opposing structure. The limiting rings 223 can be fixed to the outer circumference of the moving component by means of threaded connection, welding, slot fitting, or interference fit. Their inner diameter matches the outer diameter of the moving component to ensure stable installation. The axial distance between the two limiting rings 223 is slightly larger than the axial thickness of the fixed ring 222, allowing the fixed ring 222 to be accommodated between them and subject to contact limiting action from its upper and lower end faces.

[0067] The fixed ring 222 is a ring-shaped metal component that is sleeved on the outside of the sampling cylinder 220 and fitted into the annular space between it and the limiting plate 224. It is used to connect the drive output end of the telescopic device 225 to the sampling cylinder 220. When the telescopic device 225 moves, the moving component drives the fixed ring 222 to move synchronously, thereby realizing the lifting and lowering control of the sampling cylinder 220. During this process, if there is no effective limiting measure, the fixed ring 222 may experience axial displacement or even fall off due to gravity, inertia, or disturbance from molten steel, causing the device to malfunction. Therefore, by setting two spaced limiting rings 223 on the moving component and having them abut against the end face of the fixed ring 222 from above and below respectively, a mechanical clamping structure is formed, which can effectively limit the axial degree of freedom of the fixed ring 222 and prevent it from detaching from the moving component.

[0068] As an optional implementation, the limiting ring 223 can adopt a detachable structure, such as using a snap ring or locking nut instead of an integral welded ring, to facilitate assembly and maintenance. The material can be high-temperature resistant alloy steel or stainless steel to adapt to the high-temperature environment of the argon blowing station. Furthermore, the end face of the limiting ring 223 can be provided with anti-slip textures or an elastic pad to enhance the friction between it and the fixing ring 222, further improving connection stability. In another modified embodiment, the limiting ring 223 can also be integrated inside the fixing ring 222, achieving bidirectional limiting through a built-in stepped structure, while still achieving the same technical effect.

Claims

1. A temperature measurement and sampling device for an argon blowing station, characterized in that, Includes a protective cylinder (100), and a sampling component (200) is installed inside the protective cylinder (100). The sampling assembly (200) includes a sampling tube (220), the upper section of which is a receiving tube and the lower section is a sampling tube (221), the sampling tube (221) being used to extend into the molten steel during sampling; A piston (214) is also provided inside the receiving tube. The top of the piston (214) is connected to a connecting plate (212) via a piston rod (213). The connecting plate (212) is also connected to a drive assembly (210), which is used to drive the piston (214) to move in the upper section in sequence through the connecting plate (212) and the piston rod (213) to introduce molten steel into the receiving pipe.

2. The argon blowing station temperature measurement and sampling device as described in claim 1, characterized in that, The drive assembly (210) includes a lifter (211); The protective cylinder (100) is provided with a mounting cylinder (110) for installing the lifting device (211) on its side. The top of the lifter (211) is connected to the connecting plate (212).

3. The argon blowing station temperature measurement and sampling device as described in claim 2, characterized in that, The bottom of the protective cylinder (100) is provided with a downward-facing mounting groove (140), and an expansion joint (225) is installed in the mounting groove (140). The movable part of the telescopic device (225) is connected to the sampling cylinder (220).

4. The argon blowing station temperature measurement and sampling device as described in claim 2 or 3, characterized in that, A guide slider (227) is provided on the outer wall of the sampling tube (220); The inner wall of the protective cylinder (100) has a guide groove (150) that runs vertically and cooperates with the guide slider (227).

5. The argon blowing station temperature measurement and sampling device as described in claim 4, characterized in that, The inner wall of the sampling tube (220) is also provided with an installation groove for installing a thermocouple (226).

6. The argon blowing station temperature measurement and sampling device as described in claim 3, characterized in that, A retaining ring (222) is installed on the moving part; Limiting plates (224) are provided at intervals on the upper and lower sides of the sampling tube (220), and an annular space is formed between the limiting plates (224); The fixing ring (222) is installed in the annular space.

7. The argon blowing station temperature measurement and sampling device as described in claim 6, characterized in that, There are at least two expansion joints (225), which are arranged circumferentially on the protective cylinder (100); The moving parts of at least two of the telescopic elements (225) are connected to the same fixed ring (222).

8. The argon blowing station temperature measurement and sampling device as described in claim 6 or 7, characterized in that, The sampling tube (221) is a frustum-shaped tube that is larger at the top and smaller at the bottom, and has several inlet holes on the tube wall.

9. The argon blowing station temperature measurement and sampling device as described in claim 8, characterized in that, The protective cylinder (100) has a central hole at the top, and a first sealing ring (130) is installed on the central hole. The first sealing ring (130) slides and seals with the piston rod (213). The sampling cylinder (220) has a through hole (228) at the top, and a second sealing ring (229) is installed on the through hole (228). The second sealing ring (229) slides and seals with the piston rod (213).

10. The argon blowing station temperature measurement and sampling device as described in claim 9, characterized in that, The movable part is provided with limit rings (223) at intervals, and the two limit rings (223) clamp the fixed ring (222) from the upper and lower end faces of the fixed ring (222) respectively.

Images