Method for directionally blocking sprayed water on outlet side of rolling mill and guaranteeing precision of width gauge

Abstract

The invention relates to the technical field of steel rolling production equipment, and particularly discloses a rolling mill outlet side water spraying directional blocking and width gauge precision guaranteeing method which comprises a directional blocking mechanism, a flow guide recycling mechanism, a sealing protection mechanism and an intelligent monitoring and adjusting mechanism. The directional blocking mechanism is arranged between a rolling mill outlet descaling device and a width gauge, and accurate guiding of descaling water is achieved through an angle-adjustable blocking plate. The flow guide recycling mechanism is used for collecting the blocked descaling water and enabling the water to flow back to the circulating system; the sealing protection mechanism forms a closed protection space of a width gauge detection area; the intelligent monitoring and adjusting mechanism monitors the water flow state and the width gauge detection precision in real time and automatically adjusts the angle of the blocking plate; interference of descaling water on the width gauge is effectively eradicated, long-term stable operation of the width gauge is guaranteed, the size detection precision of rolled steel products is improved, the equipment maintenance cost is reduced, and the method is suitable for various hot rolling mill production lines.

Description

Technical Field

[0001] This invention relates to the field of steel rolling production equipment technology, specifically to a method for directional water spraying and width measuring instrument accuracy assurance at the mill exit side. Background Technology

[0002] In the steel rolling process, a descaling device is typically installed at the mill exit to remove iron oxide scale from the surface of the rolled piece using high-pressure water spray, ensuring surface quality. Simultaneously, a width gauge is installed at the mill exit to monitor the dimensional accuracy of the rolled piece in real time, using optical imaging principles to detect the width online. However, existing technologies suffer from the following problems: the high-pressure water sprayed from the descaling device is prone to splashing, with some water directly spraying or drifting into the width gauge's detection area, causing lens contamination, blurred images, and consequently, decreased detection accuracy, or even data distortion. Furthermore, the splashing water mist increases the humidity around the width gauge, which, over time, can damage the internal electrical components, increasing maintenance costs and downtime.

[0003] Currently, the industry typically addresses these issues using simple baffles or manual cleaning. However, the fixed baffle angles cannot be flexibly adjusted according to changes in descaling water pressure and rolled piece specifications, resulting in limited blocking effectiveness. Manual cleaning is not only labor-intensive but also lacks real-time protection, failing to fundamentally solve the problem of descaling water interference with the width measuring instrument. Therefore, there is an urgent need to design a method for precisely blocking descaling water and ensuring the long-term stable operation of the width measuring instrument through directional water spraying at the mill exit, thereby resolving the technical problem of existing mill exit descaling water easily splashing into the width measuring instrument's detection area, causing imaging interference and reduced detection accuracy. Summary of the Invention

[0004] To address the problems existing in the prior art, the purpose of this invention is to provide a method for directional blocking of water spray on the exit side of a rolling mill and ensuring the accuracy of a width measuring instrument.

[0005] The technical solution adopted by this invention to solve its technical problem is: a method for directional blocking of water spray on the exit side of a rolling mill and ensuring the accuracy of a width measuring instrument, comprising the following steps:

[0006] S1. Initialization stage: Before the mill starts, the initial angle of the directional blocking mechanism's blocking plate, the air volume of the negative pressure exhaust component, and the humidity threshold of the drying component are set through the central controller.

[0007] S2, Real-time Blocking Stage: When the mill is running, the descaling device sprays high-pressure water to remove iron oxide scale from the surface of the rolled piece. The blocking plate adjusts its angle under the control of the central controller based on the detection data, guiding the splashed descaling water to the flow recovery mechanism below. The water flows into the filter assembly through the flow recovery mechanism's guide channel, removes impurities, and then flows back to the circulating water system through the return water pipe.

[0008] S3, Sealing and Protection Stage: The telescopic sealing curtain automatically opens and closes according to the position of the rolled piece, forming a closed space in the width measuring instrument's detection area; the negative pressure exhaust component continuously extracts water vapor from the space, and the drying component maintains a low humidity environment in the space.

[0009] S4, Intelligent Adjustment Stage: The image acquisition module acquires the width measuring instrument's detection image in real time, and the accuracy analysis module calculates the detection error; if the error exceeds the set threshold, the central controller automatically adjusts the angle of the barrier until the error returns to the normal range; the remote communication module uploads the equipment operation data to the monitoring platform.

[0010] Specifically, in step S1, the directional blocking mechanism is located above and on both sides of the rolling line between the descaling device at the mill exit and the width measuring instrument. The directional blocking mechanism includes a blocking plate, an angle adjustment component, and a support frame. The blocking plate has an arc-shaped structure. The angle adjustment component includes a drive motor, a transmission gear set, and an angle sensor. The angle sensor is mounted on the drive shaft of the drive motor. The drive motor controls the rotation of the rotating shaft through the transmission gear. The rotating shaft is fixedly connected to the blocking plate. The rotating shaft is movably mounted on the support frame through bearings. The drive motor controls the blocking plate to rotate around the support frame for angle adjustment within the range of 0-60°.

[0011] Specifically, the initial angle of the barrier plate is preset according to the specifications of the rolled piece and the descaling water pressure.

[0012] Specifically, the barrier plate has a nano-hydrophobic coating on its surface with a contact angle ≥150°, and the barrier plate has reinforcing ribs inside, which are made of stainless steel and spaced 15-20cm apart.

[0013] Specifically, the angle adjustment component is also equipped with a manual adjustment knob, which is located on the rotating shaft and equipped with a locking gear. In the power-off state, it is used for manual adjustment of the angle of the barrier plate, with an adjustment accuracy of 0.5°.

[0014] Specifically, the flow guiding and recovery mechanism in step S2 is located below the directional blocking mechanism. The flow guiding and recovery mechanism includes a flow guiding channel, a filter assembly, and a return water pipe. The flow guiding channel is an inclined structure with an inclination angle of 5-10°. The filter assembly is located at the end of the flow guiding channel. One end of the return water pipe is connected to the filter assembly, and the other end is connected to the rolling mill circulating water system.

[0015] Specifically, the filter assembly includes a coarse filter and a fine filter. The coarse filter has a pore size of 2-3 mm, and the fine filter has a pore size of 0.5-1 mm. The filter assembly and the guide channel are connected by bolts.

[0016] Specifically, the telescopic sealing curtain in step S3 includes a fixed frame and a movable curtain body. The movable curtain body is made of silicone rubber with a thickness of 2-3mm. The movable curtain body is connected to the fixed frame through a slide rail and is used for horizontal extension and retraction with a stroke of 0-50cm.

[0017] Specifically, the negative pressure exhaust assembly in step S3 includes an exhaust fan and an air duct, and the air volume of the exhaust fan is 1000-1500 m³ / h. 3 / h, the inner wall of the air duct is lined with sound-absorbing cotton, the thickness of which is 5-8mm. The negative pressure exhaust component is used to remove water vapor from the sealed space.

[0018] Specifically, in step S3, the drying component includes a dehumidifier, a humidity sensor, and a temperature sensor. The dehumidifier has a dehumidification capacity of 0.5-1L / h, the humidity sensor has a humidity threshold of ≤50%, and the temperature sensor has a measurement range of 0-100℃ and an accuracy of ±0.5℃. The dehumidifier is automatically started and stopped according to the temperature and humidity in the sealed space. The drying component is used to maintain a low humidity environment in the sealed space.

[0019] The present invention has the following beneficial effects:

[0020] This invention presents a method for directional water spray blocking at the mill exit side and ensuring the accuracy of the width measuring instrument. This method effectively eliminates interference from descaling water on the width measuring instrument, ensuring its long-term stable operation, improving the accuracy of dimensional inspection of rolled steel products, and reducing equipment maintenance costs. It is applicable to various hot rolling mill production lines. The width measuring instrument is less affected by descaling water corrosion, reducing equipment maintenance frequency by two times per year, lowering employee workload, and extending the instrument's service life. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be described clearly, completely, and in further detail below. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] A method for directional water spraying and width measuring instrument accuracy assurance at the mill exit side includes the following steps:

[0023] 1. Initialization stage: Before the mill starts, the initial angle of the directional blocking mechanism's blocking plate is set by the central controller (preset according to the specifications of the rolled piece and the descaling water pressure), the air volume of the negative pressure exhaust component (1000-1500m³ / h) and the humidity threshold of the drying component (≤50%).

[0024] The directional blocking mechanism is located above and on both sides of the rolling line between the descaling device at the mill exit and the width measuring instrument. The directional blocking mechanism includes a blocking plate, an angle adjustment assembly, and a support frame. The blocking plate has an arc-shaped structure. The angle adjustment assembly includes a drive motor, a transmission gear set, and an angle sensor. The angle sensor is mounted on the drive shaft of the drive motor. The drive motor controls the rotation of the rotating shaft through the transmission gear. The rotating shaft is fixedly connected to the blocking plate and is movably mounted on the support frame through bearings. The drive motor controls the blocking plate to rotate around the support frame for angle adjustment within the range of 0-60°.

[0025] The barrier plate has a nano-hydrophobic coating on its surface with a contact angle ≥150°. The barrier plate has internal reinforcing ribs made of stainless steel with a spacing of 15-20cm.

[0026] The angle adjustment assembly is also equipped with a manual adjustment knob, which is located on the rotating shaft and has a locking gear. In the power-off state, it is used for manual adjustment of the angle of the barrier plate, with an adjustment accuracy of 0.5°.

[0027] 2. Real-time blocking stage: When the rolling mill is running, the descaling device sprays high-pressure water to remove iron oxide scale from the surface of the rolled piece. The blocking plate adjusts its angle under the control of the central controller according to the detection data, and guides the splashed descaling water to the flow recovery mechanism below. The water flows into the filter component through the flow channel of the flow recovery mechanism, removes impurities, and then flows back to the circulating water system through the return water pipe.

[0028] The flow guiding and recovery mechanism is located below the directional blocking mechanism. The flow guiding and recovery mechanism includes a flow guiding channel, a filter assembly, and a return water pipe. The flow guiding channel has an inclined structure with an inclination angle of 5-10°. The filter assembly is located at the end of the flow guiding channel. One end of the return water pipe is connected to the filter assembly, and the other end is connected to the rolling mill circulating water system.

[0029] The filter assembly includes a coarse filter and a fine filter. The coarse filter has a pore size of 2-3mm, and the fine filter has a pore size of 0.5-1mm. The filter assembly and the guide channel are connected by bolts for easy cleaning and replacement.

[0030] 3. Sealing and protection stage: The telescopic sealing curtain automatically opens and closes according to the position of the rolled piece, forming a closed space in the width measuring instrument detection area; the negative pressure exhaust component continuously extracts water vapor from the space, and the drying component maintains a low humidity environment in the space.

[0031] The telescopic sealing curtain consists of a fixed frame and a movable curtain body. The movable curtain body is made of silicone rubber with a thickness of 2-3mm. The movable curtain body is connected to the fixed frame via a slide rail and is used for horizontal extension and retraction with a stroke of 0-50cm.

[0032] The negative pressure exhaust system includes an exhaust fan and an air duct; the exhaust fan has an air volume of 1000-1500 m³ / h. 3 / h, the inner wall of the air duct is lined with sound-absorbing cotton, which is 5-8mm thick, to reduce noise during the exhaust process. The negative pressure exhaust component is used to remove water vapor from the sealed space.

[0033] The drying assembly includes a dehumidifier, a humidity sensor, and a temperature sensor. The dehumidifier has a dehumidification capacity of 0.5-1L / h, the humidity sensor has a humidity threshold of ≤50%, and the temperature sensor has a measurement range of 0-100℃ with an accuracy of ±0.5℃. The dehumidifier automatically starts and stops according to the temperature and humidity in the sealed space. The drying assembly is used to maintain a low humidity environment in the sealed space.

[0034] 4. Intelligent Adjustment Stage: The image acquisition module acquires the detection image of the width measuring instrument in real time, and the accuracy analysis module calculates the detection error; if the error exceeds the set threshold (such as ±0.1mm), the central controller automatically adjusts the angle of the barrier until the error returns to the normal range; the remote communication module uploads the equipment operation data to the monitoring platform for real-time monitoring by management personnel.

[0035] The invention is installed on both sides of the rolling line at the exit section of the rolling mill. It consists of four parts: a directional blocking mechanism, a flow guiding and recovery mechanism, a sealing and protection mechanism, and an intelligent monitoring and adjustment mechanism. The mechanisms work together to achieve precise blocking and recovery of descaling water and all-round protection for the width measuring instrument.

[0036] directional blocking mechanism

[0037] Barrier plate: Made of curved stainless steel plate with a nano hydrophobic coating on the surface, which can reduce water adhesion and accelerate water flow. The curved structure design can change the direction of water flow and prevent water from splashing directly towards the width measuring instrument.

[0038] Angle adjustment assembly: Composed of a drive motor, transmission gear set, angle sensor and manual adjustment knob; the drive motor is a servo motor, which can realize precise control of the barrier plate angle; the angle sensor provides real-time feedback on the barrier plate angle to ensure adjustment accuracy; the manual adjustment knob is used for emergency operation in case of power failure, improving equipment reliability.

[0039] Support frame: Made of carbon steel with anti-corrosion treatment on the surface, and equipped with height-adjustable feet at the bottom, which can be finely adjusted according to the on-site installation environment to ensure that the barrier plate is aligned with the rolling line.

[0040] diversion and recycling mechanism

[0041] Flow guide channel: Installed below the directional barrier mechanism, it has an inclined structure with an inclination angle of 5-10° to ensure that the water flows quickly to the filter components and avoids water accumulation; the inner wall of the flow guide channel is made of smooth and wear-resistant material to reduce water flow resistance.

[0042] Filter assembly: It adopts a double-layer filter design. The coarse filter intercepts large particles of iron oxide scale, while the fine filter filters out small impurities to prevent impurities from clogging the return water pipe. The filter has a detachable structure for easy regular cleaning and replacement.

[0043] Return water pipe: High-temperature resistant rubber pipe is used to connect the filter components to the rolling mill circulating water system to realize the recycling of descaling water and reduce water consumption.

[0044] Sealing and protection mechanism

[0045] Telescopic sealing curtain: It is set around the detection area of ​​the width measuring instrument and is made of heat-resistant and waterproof silicone rubber material, which can adapt to the high temperature environment at the mill exit. It can be horizontally extended and retracted through the slide rail. It automatically opens when the rolled piece passes through and automatically closes after the rolled piece leaves, forming a closed protective space.

[0046] Negative pressure exhaust system: Includes exhaust fan and sound-absorbing duct. The exhaust fan continuously extracts water vapor from the sealed space to prevent water mist from condensing on the surface of the width measuring instrument lens; the sound-absorbing cotton on the inner wall of the duct can reduce exhaust noise and meet the environmental protection requirements of the workshop.

[0047] Drying component: Composed of a dehumidifier and a temperature sensor, it monitors the temperature and humidity in the sealed space in real time. When the humidity exceeds the set threshold (≤50%), the dehumidifier will start automatically to maintain a dry environment and protect the electrical components of the width measuring instrument.

[0048] Intelligent monitoring and regulation mechanism

[0049] Data acquisition module: includes a humidity sensor and an image acquisition module; the humidity sensor is installed on the outside of the barrier plate to monitor the intensity and direction of descaling water splash; the image acquisition module is connected to the width measuring instrument data interface to acquire real-time detection images.

[0050] Accuracy Analysis Module: Processes the images detected by the width measuring instrument, calculates the width detection error, and determines whether there is water flow interference.

[0051] Central controller: It adopts a PLC controller, receives data from various sensors, and automatically adjusts the angle of the baffle plate, the air volume of the exhaust fan, and the operating status of the dehumidifier according to the preset algorithm; it also has a fault diagnosis function, and issues an alarm signal in a timely manner when the equipment malfunctions.

[0052] After implementing this invention, the width measuring instrument is less affected by descaling water corrosion, reducing equipment maintenance by two times per year, lowering employee workload, and extending the instrument's lifespan. Improved width measurement accuracy reduces the slab width deviation rate, decreasing the amount of trimming caused by width discrepancies, and reducing metal loss per slab by an average of approximately 10 kg. Furthermore, the "biting open, delayed closing" control logic completely eliminates black mark defects on the slab surface, significantly reducing the defect rate. Annual profit = unit time capacity × failure reduction time rate × profit per ton of product. After project implementation, an annual revenue of 400,000 yuan can be realized.

[0053] This invention is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention.

[0054] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A method for directional water spraying and width measuring instrument accuracy assurance at the mill exit side, characterized in that, Includes the following steps: S1. Initialization stage: Before the mill starts, the initial angle of the directional blocking mechanism's blocking plate, the air volume of the negative pressure exhaust component, and the humidity threshold of the drying component are set through the central controller. S2, Real-time Blocking Stage: When the mill is running, the descaling device sprays high-pressure water to remove iron oxide scale from the surface of the rolled piece. The blocking plate adjusts its angle under the control of the central controller based on the detection data, guiding the splashed descaling water to the flow recovery mechanism below. The water flows into the filter assembly through the flow recovery mechanism's guide channel, removes impurities, and then flows back to the circulating water system through the return water pipe. S3, Sealing and Protection Stage: The telescopic sealing curtain automatically opens and closes according to the position of the rolled piece, forming a closed space in the width measuring instrument's detection area; the negative pressure exhaust component continuously extracts water vapor from the space, and the drying component maintains a low humidity environment in the space. S4, Intelligent Adjustment Stage: The image acquisition module acquires the width measuring instrument's detection image in real time, and the accuracy analysis module calculates the detection error; if the error exceeds the set threshold, the central controller automatically adjusts the angle of the barrier until the error returns to the normal range; the remote communication module uploads the equipment operation data to the monitoring platform.

2. The method for directional water spraying and width measuring instrument accuracy assurance at the mill exit side according to claim 1, characterized in that, In step S1, the directional blocking mechanism is set above and on both sides of the rolling line between the descaling device at the mill exit and the width measuring instrument. The directional blocking mechanism includes a blocking plate, an angle adjustment component, and a support frame. The blocking plate has an arc-shaped structure. The angle adjustment component includes a drive motor, a transmission gear set, and an angle sensor. The angle sensor is installed on the drive shaft of the drive motor. The drive motor controls the rotation of the rotating shaft through the transmission gear. The rotating shaft is fixedly connected to the blocking plate. The rotating shaft is movably mounted on the support frame through bearings. The drive motor controls the blocking plate to rotate around the support frame for angle adjustment within the range of 0-60°.

3. The method for directional water spraying and width measuring instrument accuracy assurance at the mill exit side according to claim 2, characterized in that, The initial angle of the barrier plate is preset according to the specifications of the rolled piece and the descaling water pressure.

4. The method for directional water spraying and width measuring instrument accuracy assurance at the mill exit side according to claim 2, characterized in that, The barrier plate has a nano-hydrophobic coating on its surface with a contact angle ≥150°. The barrier plate has internal reinforcing ribs made of stainless steel with a spacing of 15-20cm.

5. The method for directional water spraying and width measuring instrument accuracy assurance at the mill exit side according to claim 2, characterized in that, The angle adjustment component is also equipped with a manual adjustment knob, which is located on the rotating shaft and has a locking gear. In the power-off state, it is used for manual adjustment of the angle of the barrier plate, with an adjustment accuracy of 0.5°.

6. The method for directional water spraying and width measuring instrument accuracy assurance at the mill exit side according to claim 1, characterized in that, The flow guiding and recovery mechanism in step S2 is located below the directional blocking mechanism. The flow guiding and recovery mechanism includes a flow guiding channel, a filter assembly, and a return water pipe. The flow guiding channel is an inclined structure with an inclination angle of 5-10°. The filter assembly is located at the end of the flow guiding channel. One end of the return water pipe is connected to the filter assembly, and the other end is connected to the rolling mill circulating water system.

7. The method for directional water spraying and width measuring instrument accuracy assurance at the mill exit side according to claim 6, characterized in that, The filter assembly includes a coarse filter and a fine filter. The coarse filter has a pore size of 2-3 mm, and the fine filter has a pore size of 0.5-1 mm. The filter assembly and the guide channel are connected by bolts.

8. The method for directional water spraying and width measuring instrument accuracy assurance at the mill exit side according to claim 1, characterized in that, The telescopic sealing curtain in step S3 includes a fixed frame and a movable curtain body. The movable curtain body is made of silicone rubber with a thickness of 2-3mm. The movable curtain body is connected to the fixed frame through a slide rail and is used for horizontal extension and retraction with a stroke of 0-50cm.

9. The method for directional water spraying and width measuring instrument accuracy assurance at the mill exit side according to claim 1, characterized in that, The negative pressure exhaust assembly in step S3 includes an exhaust fan and an air duct, and the air volume of the exhaust fan is 1000-1500 m³ / h. 3 / h, the inner wall of the air duct is lined with sound-absorbing cotton, the thickness of which is 5-8mm. The negative pressure exhaust component is used to exhaust water vapor in the sealed space.

10. The method for directional blocking of water spray at the mill exit side and ensuring the accuracy of the width measuring instrument according to claim 1, characterized in that, In step S3, the drying component includes a dehumidifier, a humidity sensor, and a temperature sensor. The dehumidifier has a dehumidification capacity of 0.5-1L / h, the humidity sensor has a humidity threshold of ≤50%, and the temperature sensor has a measurement range of 0-100℃ and an accuracy of ±0.5℃. The dehumidifier is automatically started and stopped according to the temperature and humidity in the sealed space. The drying component is used to maintain a low humidity environment in the sealed space.