Adjusting method for improving precision of cutting trolley of bloom continuous casting machine

Abstract

The invention relates to the field of bloom flame cutting machines, in particular to an adjusting method for improving the precision of a cutting trolley of a bloom continuous casting machine, which comprises the following steps: A, the length of a powder nozzle is improved, and the length of the improved powder nozzle is 1.5-2.5 cm; b, the height of the ejector and the height of the cutting gun are adjusted, and centering installation of the ejector and the cutting gun is achieved through a nested positioning structure; c, the bending angle of a powder discharging device in the ejector is improved, the improved bending angle ranges from 15 degrees to 60 degrees, and forced purging operation is conducted on the used ejector; and D, transforming the layout of the energy medium pipeline system, and adjusting the mounting position of an electrical element at the same time. The method has the effect of reducing cutting deviation caused by energy fluctuation.

Description

Technical Field

[0001] This application relates to the field of large billet fire-cutting machines, and in particular to an adjustment method for improving the accuracy of the cutting carriage of a large billet continuous casting machine. Background Technology

[0002] Continuous casting is a production process that involves continuously casting molten steel at high temperatures into billets with specific cross-sectional shapes and dimensions. The equipment required to complete this process is called a continuous casting system. The electromechanical-hydraulic integration of the casting equipment, the continuous casting machine itself, the cutting area equipment, and the dummy bar collection and conveying equipment constitutes the core equipment of continuous casting, conventionally referred to as the continuous casting machine. The flame cutter (fire cutter) in the large billet continuous casting machine is a key piece of equipment in the continuous casting production line. It uses a gas system to generate a high-temperature flame to heat the metal billet to a molten state, and then uses a high-speed oxygen stream to blow away oxides to achieve cutting.

[0003] Current mainstream technologies generally suffer from energy supply fluctuations and insufficient control system stability. On the one hand, densely packed valves and filters are prone to gas path blockage, causing fluctuations in natural gas transmission pressure. On the other hand, electrical components, due to their proximity to heat sources (operating environment temperature ≥70℃), frequently experience encoder failure and control signal drift under high-temperature interference. These defects result in cutting accuracy typically being maintained at only ±0.5mm, requiring maintenance shutdowns every 8 hours, severely impacting continuous production efficiency. With the increase in production capacity of high-quality steel lines (especially H13 hot work die steel), these problems are further amplified. H13 steel is extremely sensitive to cutting accuracy; any energy fluctuations or control instability will lead to an expansion of the heat-affected zone of the cut, deterioration of the microstructure, and ultimately a reduction in product fatigue life. However, existing domestic equipment only possesses some similar functions, and dedicated optimization technology for large billet cutting carriages is almost nonexistent. Summary of the Invention

[0004] To reduce cutting deviations caused by energy fluctuations, this application provides an adjustment method for improving the accuracy of the cutting carriage of a large billet continuous casting machine.

[0005] This application provides a method for improving the accuracy of the cutting carriage in a large billet continuous casting machine, which adopts the following technical solution: A method for improving the accuracy of the cutting carriage in a large billet continuous casting machine includes the following steps: A. Improve the length of the powder spray nozzle; the improved powder spray nozzle length is 1.5-2.5cm. B. Adjust the height of the injector and the cutting torch, and use a nested positioning structure to achieve the centering and installation of the injector and the cutting torch; C. Improve the bending angle of the powder feeding device inside the injector, the improved bending angle is 15°-60°, and perform forced purging operation on the injector after use; D. Modify the layout of the energy medium pipeline system, and at the same time, adjust the installation positions of electrical components.

[0006] By adopting the above technical solutions, step A optimizes the length of the powder spray nozzle based on the principles of heat conduction and airflow dynamics, shortening the internal airflow path of the nozzle, reducing the increased airflow resistance caused by excessive length, avoiding insufficient powder spraying power and uneven powder distribution, while reducing the risk of heat accumulation caused by excessively short length, preventing nozzle red-hot deformation, and ensuring stable airflow during powder spraying; step B uses a nested positioning structure to achieve the centering installation of the sprayer and the cutting torch, constraining the parallelism and perpendicularity of the sprayer and the cutting torch, and avoiding cutting path deviation or angle deviation caused by misalignment; step C adjusts the powder-feeding bend angle of the sprayer to 15°-60°, reducing the flow resistance of powder at the bend, reducing the risk of blockage, and using forced purging to remove residual powder and prevent scaling, ensuring the continuous unobstructed flow of the internal pipes of the sprayer; step D reduces the dense layout of external pipes, reducing the probability of airflow blockage; and adjusting the installation position of electrical components reduces the interference of high temperature on the performance of precision components such as encoders, ensuring the accuracy of sensor signals.

[0007] Preferably, in step B, the connection between the powder spraying head and the nozzle is provided with a nested positioning groove and a positioning pin structure, the positioning pin is inserted into the positioning groove, and the powder spraying head and the nozzle are parallel and aligned in both the horizontal and vertical directions.

[0008] By adopting the above technical solution, the positioning pin is inserted into the positioning groove to limit the relative displacement of the powder spraying head and the nozzle in the horizontal and vertical directions. If the two are not aligned, the cutting oxygen flow will cause the cutting surface to tilt or be uneven in width due to the path deviation. At the same time, the nested contact area is larger and the force is more uniform, which can effectively absorb the small deformation caused by vibration or thermal expansion during equipment operation and avoid the reduction of cutting accuracy due to the accumulation of position deviation.

[0009] Preferably, the positioning groove has a depth of 8mm, a width of 10mm, a diameter of 6mm, a length of 12mm, and is a dovetail groove.

[0010] By adopting the above technical solution, the dovetail groove and the positioning pin cooperate to form a uniform gap in the width direction. The gap allows the positioning pin to automatically correct slight offsets when inserted by the inclined surface. At the same time, the self-locking effect of the inclined surface can limit lateral displacement and ensure horizontal parallel alignment accuracy. The matching of the positioning groove depth of 8mm and the positioning pin length of 12mm ensures the effective contact length between the positioning pin and the groove, increases the contact area, avoids connection loosening problems caused by insufficient contact area, and thus improves the vertical alignment stability.

[0011] Preferably, a gasket for elastic buffering is provided between the positioning groove and the positioning pin, and the gasket has a thickness of 2mm.

[0012] By adopting the above technical solution, during installation, due to machining tolerances or assembly errors, there may be slight deviations in the geometric dimensions of the positioning groove and the positioning pin. A 2mm thick shim can fill this gap, avoiding installation jamming or local stress concentration caused by rigid contact. At the same time, the elastic deformation of the shim adaptively corrects the slight misalignment. During equipment operation, the continuous casting machine will generate high-frequency vibrations during the cutting process. The shim is used to buffer the vibrations and effectively suppress the relative sliding between the positioning pin and the groove.

[0013] Preferably, the alignment of the powder spray head and the nozzle in both the horizontal and vertical directions includes the following steps: The laser transmitter and receiver are deployed symmetrically at the powder spraying head and the nozzle. The measurement data is analyzed in real time, and the parallelism deviation and spacing between the powder spraying head and the nozzle are calculated. An alarm is triggered when a parallelism deviation exceeding ±0.2mm or a spacing greater than 5mm is detected. Adjust the position of the powder spray head and nozzle, and continue measuring after adjustment; Repeat the measurement steps until the parallelism deviation and spacing of the powder spray head and nozzle meet the standards.

[0014] By adopting the above technical solution, laser emitters and receivers are deployed symmetrically at the powder spraying head and nozzle. Utilizing the high directionality and high precision of lasers, the relative position data of the two are acquired in real time, avoiding errors caused by line-of-sight errors or human reading deviations in manual measurement. Intelligent algorithms analyze the measurement data in real time and calculate parallelism deviation and spacing values. The system identifies out-of-tolerance signals to ensure that deviations are detected quickly. During the adjustment process, the laser alignment instrument continuously monitors position changes and transmits data back. The system automatically compares the adjusted parameters with the standard values, dynamically guiding maintenance personnel to correct the position, forming a closed-loop process of measurement-adjustment-re-measurement, ensuring consistent alignment accuracy for each installation.

[0015] Preferably, step D includes the following steps: Relocate components such as encoders and sensors to an independent pipeline thermal insulation protection area; Increase the distance between components such as encoders and sensors and heat sources to at least 20cm; A cooling system is installed outside components such as encoders and sensors.

[0016] By adopting the above technical solution, components such as encoders and sensors, which are close to the cutting oxygen gun or gas nozzle, are exposed to heat sources with temperatures exceeding 70°C. Long-term exposure to heat radiation and conduction causes parameter drift in internal electronic components such as capacitors, resistors, and chips due to temperature increases, leading to signal output delays or distortions. This affects the speed control of the cutting oxygen flow and the accuracy of the cutting path. Moving these components to an independent heat-insulating protection zone blocks direct heat radiation from the heat source. Increasing the distance to over 20cm reduces the actual heat received by the components. The external cooling system stably controls the operating temperature of the components below 40°C, eliminating the impact of high temperatures on the performance of electronic components.

[0017] Preferably, the heat insulation protection range is composed of at least one heat insulation protection plate.

[0018] By adopting the above technical solution, the heat insulation and protection board has the characteristic of low thermal conductivity. Its board structure can form a continuous heat insulation interface. On the one hand, it reduces the radiative heat transfer from the heat source to the component by reflecting thermal radiation, and on the other hand, it blocks convective heat transfer by the low thermal conductivity of the board.

[0019] Preferably, the external cooling system is an air-cooled system.

[0020] By adopting the above technical solution, the air-cooling system drives the air to flow in a forced manner through a built-in or external fan, forming a directional airflow that directly passes over the heat dissipation surface of components such as encoders and sensors, and utilizes the temperature difference between the air and the surface of the components to achieve convective heat transfer.

[0021] Preferably, the air-cooling system reduces the ambient temperature of the encoder, the sensor and other components to no higher than 40°C.

[0022] By adopting the above technical solution, the normal operating temperature of electronic components usually needs to be controlled within the range of 0-50℃. Exceeding this range can easily lead to parameter drift or performance degradation. However, the surface temperature of the cutting area of ​​the continuous casting machine can reach above 70℃ due to its proximity to heat sources such as oxygen lances and gas nozzles, which affects the speed control of the cutting oxygen flow and the accuracy of path planning. By using a forced convection cooling system, the ambient temperature of the components is stably controlled below 40℃, allowing the electronic components to operate normally and ensuring the accuracy of the cutting path.

[0023] Preferably, the pipeline design includes three main gas lines, all of which are made of stainless steel. The pipeline includes an electrical control gas line, a main and auxiliary cutting gun tube, and a natural gas preheating oxygen line.

[0024] By adopting the above technical solution, the electrical control gas pipeline is responsible for supplying gas to the solenoid valve group, the main and auxiliary tubes of the cutting gun are responsible for the mixed delivery of gas / oxygen, and the natural gas preheating oxygen pipeline is responsible for preheating before cutting. This avoids gas cross-interference caused by the mixed layout of multiple pipelines. After the electrical control gas pipeline is made of stainless steel, the gas transmission pressure loss is reduced. The stainless steel material of the main and auxiliary tubes of the cutting gun effectively avoids the problem of pipe wall thinning caused by long-term high-pressure gas / oxygen erosion. The stainless steel pipe of the natural gas preheating oxygen pipeline enhances the heat transfer efficiency of the preheating process and avoids the risk of gas leakage caused by pipe wall corrosion.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. Step A optimizes the length of the powder nozzle based on the principles of heat conduction and airflow dynamics, shortening the internal airflow path of the nozzle, reducing increased airflow resistance due to excessive length, avoiding insufficient powder spraying power and uneven powder distribution, while also reducing the risk of heat accumulation caused by excessively short length, preventing nozzle red-hot deformation, and ensuring stable airflow during powder spraying. Step B uses a nested positioning structure to achieve aligned installation of the sprayer and the cutting torch, constraining their parallelism and perpendicularity, and preventing cutting path deviation or angle deviation due to misalignment. Step C adjusts the powder-feeding bend angle of the sprayer to 15°-60°, reducing the flow resistance of powder at the bend, reducing the risk of blockage, and using forced purging to remove residual powder and prevent scaling, ensuring continuous unobstructed flow in the internal pipes of the sprayer. Step D reduces the density of external piping, lowering the probability of airflow blockage. Adjusting the installation position of electrical components reduces the interference of high temperatures on the performance of precision components such as encoders, ensuring the accuracy of sensor signals.

[0026] 2. Laser emitters and receivers are deployed symmetrically at the powder spraying head and nozzle. Utilizing the high directionality and precision of lasers, the relative position data of the two are acquired in real time, avoiding errors caused by line-of-sight errors or human reading deviations in manual measurement. Intelligent algorithms analyze the measurement data in real time and calculate parallelism deviation and spacing values. The system identifies out-of-tolerance signals to ensure that deviations are detected quickly. During adjustment, the laser alignment instrument continuously monitors position changes and transmits data back. The system automatically compares the adjusted parameters with the standard values, dynamically guiding maintenance personnel to correct the position, forming a closed-loop process of measurement-adjustment-re-measurement to ensure consistent alignment accuracy for each installation. Attached Figure Description

[0027] Figure 1 This is a flowchart of the adjustment method for improving the accuracy of the cutting car of the large billet continuous casting machine in the embodiments of this application. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0029] This application discloses an adjustment method for improving the accuracy of the cutting carriage in a large billet continuous casting machine. The adjustment method for improving the accuracy of the cutting carriage in a large billet continuous casting machine includes the following steps: A. Improve the length of the powder spray nozzle; the improved powder spray nozzle length is 1.5-2.5cm.

[0030] Based on the principles of heat conduction and airflow dynamics, the length of the powder spray nozzle is optimized to shorten the internal airflow path of the nozzle, reduce the increase in airflow resistance caused by excessive length, avoid insufficient powder spraying power and uneven powder distribution, and at the same time reduce the risk of heat accumulation caused by excessive length, prevent the nozzle from turning red and deforming, and ensure the stability of airflow during powder spraying.

[0031] In a preferred embodiment, the length of the improved powder spray nozzle is 2cm. When the length of the powder spray nozzle is too short (e.g., 1cm), the airflow is prone to turbulence after being sprayed out of the nozzle due to the lack of sufficient constraint and buffer space, resulting in uneven powder distribution and inability to accurately control the powder spraying area and powder quantity, thus affecting product quality. At the same time, the structure of the powder spray nozzle is relatively fragile during connection and use with the powder spraying equipment, and it is easily damaged by external forces (such as slight collisions during installation, vibrations during operation, etc.), resulting in loosening of the connection or breakage of the powder spray nozzle body, affecting the normal operation of the equipment.

[0032] When the length increases to 4cm, the airflow path within the nozzle becomes longer, resulting in greater resistance and a decrease in airflow velocity. This leads to insufficient powder spraying power. During powder spraying, the longer cantilever also experiences greater bending moments, making it more prone to swaying and deformation, especially during equipment vibration or fluctuations in powder spraying pressure. This reduces the structural stability of the nozzle and makes it difficult to meet production requirements. A length of 2cm strikes a balance between these two factors. It ensures adequate confinement space for the airflow within the nozzle, allowing it to spray out stably and uniformly, while avoiding excessive airflow resistance due to excessive length, thus ensuring efficient powder spraying.

[0033] In a preferred embodiment, to accurately evaluate the improvement effect of the powder spray nozzle, the following formula can be derived: Heat conduction formula: When analyzing the temperature change of a powder spray nozzle, the heat conduction formula can be used: Q = -kA, where Q represents the heat transfer rate, k represents the thermal conductivity of the material, A represents the heat transfer area, ΔT represents the temperature difference, and Δ represents the length. This formula shows that, with the same material and heat transfer area, the shorter the length Δ of the powder spray nozzle, the faster the heat transfer rate Q, which is beneficial for reducing the nozzle temperature.

[0034] Airflow velocity formula: During powder coating, airflow velocity has a significant impact on the uniformity of powder coating. The airflow velocity formula can be used: U = Q / A, where U represents the airflow velocity, Q represents the gas flow rate, and A represents the cross-sectional area of ​​the powder coating nozzle. By optimizing the length of the powder coating nozzle, the airflow velocity can be adjusted, thereby improving the uniformity of powder coating.

[0035] B. Adjust the height of the injector and the cutting torch, and use a nested positioning structure to achieve the centering and installation of the injector and the cutting torch.

[0036] The nested positioning structure ensures the aligned installation of the sprayer and the cutting torch, constraining their parallelism and perpendicularity, and preventing cutting path deviation or angular offset due to misalignment. Specifically, the connection between the powder spraying head and the nozzle features a nested positioning groove and a positioning pin structure. The positioning pin inserts into the positioning groove, ensuring the powder spraying head and nozzle are parallel and aligned in both horizontal and vertical directions. The positioning pin, inserted into the positioning groove, restricts the relative displacement of the powder spraying head and nozzle in the horizontal and vertical directions. If they are not aligned, the cutting oxygen flow will deviate from its path, resulting in a tilted or uneven cutting surface. Furthermore, the nested structure provides a larger contact area and more uniform force, effectively absorbing minor deformations caused by vibration or thermal expansion during equipment operation, preventing a decrease in cutting accuracy due to accumulated positional misalignment.

[0037] The positioning groove has a depth of 8mm and a width of 10mm. The positioning pin has a diameter of 6mm and a length of 12mm. The positioning groove is a dovetail groove. The dovetail groove and the positioning pin work together to form a uniform gap in the width direction. This gap allows the positioning pin to automatically correct for minor offsets during insertion via the bevel. At the same time, the self-locking effect of the bevel restricts lateral displacement, ensuring horizontal parallel alignment accuracy. The matching of the 8mm positioning groove depth and the 12mm positioning pin length ensures the effective contact length between the positioning pin and the groove, increasing the contact area and avoiding loosening caused by insufficient contact area, thereby improving vertical alignment stability.

[0038] A 2mm thick shim is provided between the positioning groove and the positioning pin for elastic cushioning. During installation, due to machining tolerances or assembly errors, there may be slight deviations in the geometric dimensions of the positioning groove and the positioning pin. The 2mm thick shim can fill this gap, avoiding installation jamming or local stress concentration caused by rigid contact. At the same time, the elastic deformation of the shim adaptively corrects minor misalignments. During equipment operation, the continuous casting machine generates high-frequency vibrations during cutting, and the shim is used to cushion these vibrations, effectively suppressing the relative sliding between the positioning pin and the groove.

[0039] The steps for aligning the powder spray head and nozzle horizontally and vertically include: B.1. Deploy the laser transmitter and receiver at symmetrical positions between the powder spraying head and the nozzle.

[0040] B.2. Real-time analysis of measurement data and calculation of the parallelism deviation and spacing between the powder spraying head and the nozzle.

[0041] B.3. An alarm will be triggered when a parallelism deviation exceeding ±0.2mm or a spacing greater than 5mm is detected.

[0042] B.4. Adjust the position of the powder spray head and nozzle, and continue measuring after adjustment.

[0043] B.5. Repeat the measurement steps until the parallelism deviation and spacing of the powder spray head and nozzle meet the standards.

[0044] Laser emitters and receivers are deployed symmetrically at the powder spraying head and nozzle. Utilizing the high directionality and precision of lasers, the relative position data of the two are acquired in real time, avoiding errors caused by line-of-sight errors or human reading deviations in manual measurement. Intelligent algorithms analyze the measurement data in real time and calculate parallelism deviation and spacing values. The system identifies out-of-tolerance signals to ensure that deviations are detected quickly. During the adjustment process, the laser alignment instrument continuously monitors position changes and transmits data back. The system automatically compares the adjusted parameters with the standard values, dynamically guiding maintenance personnel to correct the position, forming a closed-loop process of measurement-adjustment-re-measurement to ensure consistent alignment accuracy for each installation.

[0045] In an optional embodiment, a laser alignment instrument is used to construct a real-time dynamic measurement system during equipment installation. By precisely deploying the laser emitter and receiver at symmetrical positions of the powder spraying head and nozzle, and utilizing high optical measurement principles, the laser alignment instrument can achieve micron-level measurement accuracy at the ±0.05mm level. The intelligent algorithm on the system can analyze the measurement data in real time, automatically calculate the parallelism deviation and spacing values ​​between the powder spraying head and nozzle, and synchronously feed the data back to the control terminal with a millisecond-level response speed. When the system detects that the parallelism deviation exceeds ±0.2mm or the spacing is greater than 5mm, the control terminal immediately triggers an audible alarm. At this time, maintenance personnel can view the deviation values ​​on a computer and manually adjust and calibrate. During manual adjustment, the laser alignment instrument continuously monitors changes in the equipment position, and the measurement data is transmitted back to the control terminal in real time.

[0046] C. Improve the bending angle of the powder feeding device inside the injector, with the improved bending angle being 15°-60°, and perform forced purging operation on the injector after use.

[0047] Adjusting the powder inlet bend angle of the injector to 15°-60° reduces the flow resistance of the powder at the bend, minimizes the risk of clogging, forces purging to remove residual powder and prevent scaling, and ensures the continuous unobstructed flow of the injector's internal pipes. In a preferred embodiment, the powder-feeding bend angle of the sprayer is 30°. Compared to excessively large angles (greater than 60°) which can lead to excessive powder feeding and difficulty in precise control, and excessively small angles (less than 15°) which can result in insufficient powder feeding and affect work efficiency, the 30° bend angle ensures smooth powder feeding while achieving reasonable and precise control of the powder feeding amount. In an optional embodiment, the powder spraying pipe is made of copper. Copper has good corrosion resistance and can effectively resist the corrosion of chemicals that may be encountered during the powder spraying process, ensuring the service life of the pipe. At the same time, copper has excellent thermal conductivity, which can quickly and evenly dissipate heat during powder spraying operations, avoiding the impact of local overheating on powder characteristics and powder spraying effect. In addition, the high smoothness of the inner wall of copper reduces the friction when the powder flows in the pipe, allowing for smoother transmission and reducing the risk of blockage. Optionally, the powder spraying pipe is made of 1.0×1.0 stainless steel, which ensures stable powder delivery at a suitable flow rate to meet the powder supply requirements of production, while avoiding situations such as powder deposition due to an excessively large pipe diameter or a surge in conveying pressure due to an excessively small pipe diameter.

[0048] D. Modify the layout of the energy medium pipeline system, and at the same time, adjust the installation positions of electrical components.

[0049] The modification of the energy medium pipeline system layout includes the following steps: D.1. Relocate components such as encoders and sensors to an independent pipeline with thermal insulation protection.

[0050] D.2. Increase the distance between encoders, sensors and other components and heat sources to at least 20cm.

[0051] D.3. Install a cooling system outside components such as encoders and sensors.

[0052] Encoders, sensors, and other components are located near the cutting oxygen gun or gas nozzle, where the heat source temperature can reach over 70°C. Prolonged exposure to heat radiation and conduction causes parameter drift in internal electronic components such as capacitors, resistors, and chips, leading to signal output delays or distortions. This affects the speed control of the cutting oxygen flow and the accuracy of the cutting path. Moving these components to an independent heat-insulated protection zone blocks direct heat radiation from the heat source. Increasing the distance to over 20cm reduces the actual heat received by the components. An external cooling system stably controls the operating temperature of the components below 40°C, eliminating the impact of high temperatures on the performance of electronic components.

[0053] In an optional embodiment, the thermal insulation protection zone consists of at least one thermal insulation shield. The thermal insulation shield has a low thermal conductivity, and its structure forms a continuous thermal insulation interface. On the one hand, it reduces radiative heat transfer from the heat source towards the component by reflecting thermal radiation; on the other hand, the low thermal conductivity of the shield blocks convective heat transfer. In an optional embodiment, the external cooling system is an air-cooled system. The air-cooled system uses a built-in or external fan to drive forced airflow, forming a directional airflow that directly passes over the heat dissipation surfaces of components such as encoders and sensors, utilizing the temperature difference between the air and the component surface to achieve convective heat transfer. The air-cooled system reduces the ambient temperature of components such as encoders and sensors to no higher than 40°C. The normal operating temperature of electronic components usually needs to be controlled within the range of 0-50℃. Exceeding this range can easily lead to parameter drift or performance degradation. However, the surface temperature of the cutting area of ​​the continuous casting machine can reach above 70℃ due to its proximity to heat sources such as oxygen lances and gas nozzles. This affects the speed control of the cutting oxygen flow and the accuracy of path planning. By using a forced convection cooling system, the ambient temperature of the components is stably controlled below 40℃, allowing the electronic components to operate normally and ensuring the accuracy of the cutting path.

[0054] The pipeline design includes three main gas lines, all constructed with stainless steel tubing. These lines include the electrical control gas line, the main and auxiliary barrels of the cutting torch, and the natural gas preheating oxygen line. The main gas line inlets feature a tapered design, with a larger inlet and a smaller outlet. The electrical control gas line supplies gas to the solenoid valve assembly, the main and auxiliary barrels of the cutting torch handle the mixed gas / oxygen delivery, and the natural gas preheating oxygen line preheats the gas before cutting. This design avoids gas cross-interference caused by a mixed pipeline layout. The use of stainless steel tubing in the electrical control gas line reduces gas transmission pressure loss. The stainless steel material of the main and auxiliary barrels of the cutting torch effectively prevents pipe wall thinning caused by long-term high-pressure gas / oxygen erosion. The stainless steel of the natural gas preheating oxygen line enhances heat transfer efficiency during preheating and avoids the risk of leakage due to pipe wall corrosion.

[0055] The electrical control gas line is 2.7 meters long with 7 holes spaced 130 mm apart. Optimizing the pipe length, hole layout, and number reduces gas pressure loss. The main and auxiliary cutting gun tubes are 2.2 meters long with 13 holes. Precise design of the number, location, and diameter of the mixing holes optimizes the mixing path and ratio of natural gas and oxygen. The natural gas preheating oxygen pipe is 3.3 meters long with 20 holes. Increasing the number of preheating holes and optimizing their layout increases the contact area between natural gas and oxygen, improving preheating efficiency. The piping structure also utilizes 40 ø14×2 stainless steel pipes, each with 40 bends, all with a uniform bend height of 120 mm.

[0056] The implementation principle of this application embodiment is as follows: Step A optimizes the length of the powder spray nozzle based on the principles of heat conduction and airflow dynamics, shortening the internal airflow path of the nozzle, reducing the increase in airflow resistance caused by excessive length, avoiding insufficient powder spraying power and uneven powder quantity, while reducing the risk of heat accumulation caused by excessive length, preventing nozzle reddening and deformation, and ensuring stable airflow during powder spraying; Step B uses a nested positioning structure to achieve the centering installation of the sprayer and the cutting torch, constraining the parallelism and perpendicularity of the sprayer and the cutting torch, and avoiding cutting path offset or angle deviation caused by misalignment; Step C adjusts the powder-feeding bend angle of the sprayer to 15°-60°, reducing the flow resistance of powder at the bend, reducing the risk of blockage, and forcibly purging to remove residual powder residue and prevent scaling, ensuring the continuous unobstructed flow of the internal pipes of the sprayer; Step D reduces the dense layout of external pipes, reducing the probability of air path blockage; and the adjustment of the installation position of electrical components reduces the interference of high temperature on the performance of precision components such as encoders, ensuring the accuracy of sensor signals.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for adjusting the precision of the cutting carriage of a large billet continuous casting machine, characterized in that, Including the following steps: A. Improve the length of the powder spray nozzle; the improved powder spray nozzle length is 1.5-2.5cm. B. Adjust the height of the injector and the cutting torch, and use a nested positioning structure to achieve the centering and installation of the injector and the cutting torch; C. Improve the bending angle of the powder feeding device inside the injector, the improved bending angle is 15°-60°, and perform forced purging operation on the injector after use; D. Modify the layout of the energy medium pipeline system, and at the same time, adjust the installation positions of electrical components.

2. The adjustment method for improving the accuracy of the cutting carriage of a large billet continuous casting machine according to claim 1, characterized in that, In step B, a nested positioning groove and positioning pin structure are provided at the connection between the powder spraying head and the nozzle. The positioning pin is inserted into the positioning groove, and the powder spraying head and the nozzle are parallel and aligned in both the horizontal and vertical directions.

3. The adjustment method for improving the accuracy of the cutting carriage of a large billet continuous casting machine according to claim 2, characterized in that, The positioning groove has a depth of 8mm, a width of 10mm, a diameter of 6mm, a length of 12mm, and is a dovetail groove.

4. The adjustment method for improving the accuracy of the cutting carriage of a large billet continuous casting machine according to claim 3, characterized in that, A gasket with a thickness of 2mm is provided between the positioning groove and the positioning pin for elastic buffering.

5. The adjustment method for improving the accuracy of the cutting carriage of a large billet continuous casting machine according to claim 2, characterized in that, The alignment of the powder spray head and the nozzle, both horizontally and vertically, includes the following steps: The laser transmitter and receiver are deployed symmetrically at the powder spraying head and the nozzle. The measurement data is analyzed in real time, and the parallelism deviation and spacing between the powder spraying head and the nozzle are calculated. An alarm is triggered when a parallelism deviation exceeding ±0.2mm or a spacing greater than 5mm is detected. Adjust the position of the powder spray head and nozzle, and continue measuring after adjustment; Repeat the measurement steps until the parallelism deviation and spacing of the powder spray head and nozzle meet the standards.

6. The adjustment method for improving the accuracy of the cutting carriage of a large billet continuous casting machine according to claim 1, characterized in that, Step D includes the following steps: Relocate components such as encoders and sensors to an independent pipeline thermal insulation protection area; Increase the distance between components such as encoders and sensors and heat sources to at least 20cm; A cooling system is installed outside components such as encoders and sensors.

7. The adjustment method for improving the accuracy of the cutting carriage of a large billet continuous casting machine according to claim 6, characterized in that, The heat insulation protection area consists of at least one heat insulation protection panel.

8. The adjustment method for improving the accuracy of the cutting carriage of a large billet continuous casting machine according to claim 6, characterized in that, The external cooling system is an air-cooled system.

9. The adjustment method for improving the accuracy of the cutting carriage of a large billet continuous casting machine according to claim 8, characterized in that, The air-cooling system reduces the ambient temperature of the encoder, sensor and other components to no higher than 40°C.

10. The adjustment method for improving the accuracy of the cutting carriage of a large billet continuous casting machine according to any one of claims 1-9, characterized in that, The pipeline design includes three main gas lines, all of which are made of stainless steel. The pipeline includes an electrical control gas line, a main and auxiliary cutting gun tube, and a natural gas preheating oxygen line.

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