Liquid level monitoring device and monitoring method for rock wool electric melting furnace

Abstract

The invention discloses a liquid level monitoring device and monitoring method for a rock wool electric melting furnace, and relates to the technical field of rock wool electric melting furnace liquid level monitoring. The liquid level monitoring device comprises a base fixedly connected to the top of an electric melting furnace, the top of the base is fixedly connected with a fixing plate, and the fixing plate is fixedly connected with a flange plate through a bolt; the top of the flange plate is fixedly connected with a radar liquid level meter body, a built-in antenna is arranged at the bottom end of the radar liquid level meter body, and the built-in antenna is covered with a first antenna. According to the radar liquid level meter, when the purging assembly works, the water cooling assembly injects cooling liquid into the water cooling cavity of the annular shell through the liquid inlet pipe, and the flow path of cold water can be prolonged through the spoilers distributed in the water cooling cavity in a staggered mode, so that the cold water can fully exchange heat with the flange plate and the radar liquid level meter body; the service life of equipment can be prevented from being affected by the high-temperature environment, and meanwhile the cooling capacity in the water cooling assembly can be fully utilized.

Description

Technical Field

[0001] This invention relates to the field of liquid level monitoring technology for rock wool electric melting furnaces, and more specifically, to a liquid level monitoring device and method for rock wool electric melting furnaces. Background Technology

[0002] Rock wool is an inorganic non-metallic material made primarily from natural rocks, minerals, or industrial waste through high-temperature melting and fiberization. It possesses excellent thermal insulation, heat insulation, and fire resistance properties, and is widely used in construction, chemical, and other fields. In the rock wool production process, the electric melting furnace is the core equipment, used to heat and melt the raw materials to form a molten liquid. The liquid level of the molten liquid directly affects the stability of subsequent fiberization processes and product quality; therefore, real-time and precise monitoring of the molten liquid level within the electric melting furnace is necessary.

[0003] Currently, existing liquid level monitoring methods mainly include mechanical probe, radar, and image acquisition detection. Among them, mechanical probe is the primary monitoring method. Mechanical probe methods involve inserting a detection rod into the furnace and then withdrawing it to calculate the liquid level depth by detecting the position of the rock wool slurry adhering to the outer wall. This operation requires periodic power interruptions to achieve measurement, affecting the furnace's production capacity and preventing real-time monitoring. Furthermore, due to the conductivity of the molten metal, the risk of misoperation is extremely high, potentially causing personal injury or death. Secondly, because the interior of the electric furnace has high light intensity and a large amount of smoke, the liquid level information collected by the high-temperature resistant camera is easily affected by light and smoke, leading to significant errors in the detection results.

[0004] Finally, while existing radar level gauges offer advantages in real-time performance and non-contact operation compared to the previous two detection methods, they still have significant drawbacks under the special operating conditions of rock wool electric melting furnaces. Firstly, the high-temperature radiation from the furnace directly affects the performance of the radar level gauge's electronic components, shortening its lifespan. Furthermore, high temperatures can cause scaling and molten dust adhesion on the antenna surface, obstructing radar signal transmission and reducing monitoring accuracy. Secondly, as the molten liquid level rises, the concentration of flue gas and dust within the furnace increases significantly, compromising the signal focusing ability of conventional radar antennas and making them susceptible to interference, leading to measurement deviations. In addition, existing radar level gauges lack adjustment mechanisms to adapt to different liquid level conditions. They struggle to maintain the measurement range at low liquid levels and are easily affected by environmental interference at high liquid levels, resulting in poor adaptability. Therefore, a liquid level monitoring device and method for rock wool electric melting furnaces are urgently needed to address these issues. Summary of the Invention

[0005] In view of the problems in related technologies, the present invention proposes a liquid level monitoring device and monitoring method for rock wool electric melting furnace, so as to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] The technical solution of this invention is implemented as follows: A liquid level monitoring device for a rock wool electric melting furnace includes a base fixedly connected to the top of the electric melting furnace, a fixing plate fixedly connected to the top of the base, a flange fixedly connected to the fixing plate by bolts, a radar liquid level gauge body fixedly connected to the top of the flange, an internal antenna provided at the bottom of the radar liquid level gauge body, and a first antenna provided on the outer cover of the internal antenna. A second antenna is provided below the fixing plate; The top of the fixing plate is provided with a transposition component for interchange of the positions of the first antenna and the second antenna. The bottom of the fixing plate is fixedly connected to a purging assembly for preventing scale buildup on the outer wall of the first antenna and a water cooling assembly for cooling the radar level gauge body and flange.

[0007] Preferably, the repositioning assembly includes a protective shell fixedly connected to the top outer wall of the fixed plate. A motor is fixedly connected to the top outer wall of the protective shell. A third rotating column is fixedly connected to the output end of the motor. A driving wheel is fixedly connected to the circumferential outer wall of the third rotating column. A second driven wheel and a third driven wheel are distributed on both sides of the driving wheel. A first driven wheel meshes with the circumferential outer wall of the third driven wheel. Both the second and third driven wheels can cooperate with the driving wheel. Only half of the teeth on the circumferential outer wall of the driving wheel can mesh. A first threaded screw is fixedly connected to the circumferential inner wall of the second driven wheel. A first threaded sleeve is threadedly connected to the circumferential outer wall of the first threaded screw. A connecting plate is rotatably connected to the bottom end of the first threaded screw. A second rotating column is fixedly connected to the bottom outer wall of the connecting plate. A support plate is fixedly connected to the wall. The second rotating column is rotatably connected to the support plate. A second transmission wheel is fixedly connected to the outer circumference of the second rotating column. A transmission belt is driven to the outer circumference of the second transmission wheel. The second transmission wheel is driven to a first transmission wheel via the transmission belt. A first rotating column is fixedly connected to the inner circumference of the first transmission wheel. One end of the first rotating column extending into the interior of the protective shell is fixedly connected to the first driven wheel. A guide column is fixedly connected to the top outer wall of the connecting plate. A guide cylinder is slidably connected to the outer circumference of the guide column. The guide cylinder is fixedly connected to the first threaded sleeve. Two second connecting columns are fixedly connected to the outer circumference of the first threaded sleeve. The two second connecting columns are arranged vertically. The other ends of the two second connecting columns are fixedly connected to the first antenna and the second antenna, respectively.

[0008] Preferably, the bottom outer wall of the fixing plate is provided with an annular groove, and a slider is fixedly connected to the end of the guide post away from the connecting plate, and the slider is slidably connected to the annular groove.

[0009] Preferably, the cross-section of the first antenna is parabolic, and the cross-section of the second antenna is flared.

[0010] Preferably, the purging assembly includes an annular shell fixedly connected to the bottom outer wall of the fixed plate, a partition fixedly connected to the inner circumference of the annular shell, the partition and the bottom inner wall of the annular shell forming an air guide cavity, an air inlet pipe fixedly connected to the bottom outer wall of the annular shell, and purging ports evenly spaced in a circular pattern on the outer circumference of the annular shell for purging and cooling the surface of the first antenna, the cross-section of the purging port being sloped, and the purging port communicating with the air guide cavity.

[0011] Preferably, the bottom outer wall of the annular shell is fixedly connected with purge pipes that are evenly spaced in a circular pattern for purging the second antenna after transposition. The purge pipes are connected to the air guide cavity, and the angle between the purge pipes and the vertical direction is 20°-30°. The top of the purge pipes is provided with a sealing plate to ensure its sealing.

[0012] Preferably, the water-cooling assembly includes an inlet pipe and an outlet pipe fixedly connected to the outer wall of the top of the flange. The other ends of the inlet pipe and the outlet pipe are connected to the annular shell. The partition and the inner wall of the top of the annular shell form a water-cooling cavity. The outer wall of the top of the partition has equidistant circular staggered lifting grooves. A baffle plate is inserted into the lifting groove. The baffle plate is sealed to the inner wall of the lifting groove by a sealing ring. The baffle plate is equidistantly circular staggered inside the water-cooling cavity.

[0013] Preferably, a small gear disk is fixedly connected to the outer circumference of the third rotating column, a large gear disk meshes with the outer circumference of the small gear disk, a second lead screw is fixedly connected to the inner circumference of the large gear disk, a second threaded sleeve is threadedly connected to the outer circumference of the second lead screw, a first connecting column is fixedly connected to one side of the outer wall of the second threaded sleeve, an annular frame is fixedly connected to the end of the first connecting column away from the second threaded sleeve, the annular frame is fixedly connected to the top outer wall of the spoiler, a limiting groove is formed on one side of the inner wall of the protective shell, the first connecting column is slidably connected to the inner walls of both sides of the limiting groove, and a horizontal plate for ensuring stable rotation of the second lead screw is fixedly connected to the inner wall of the protective shell.

[0014] Preferably, a baffle for sealing the purge port is fixedly connected to the bottom outer wall of the spoiler, a movable rod is rotatably connected to the top outer wall of the sealing plate, the end of the movable rod away from the sealing plate is located directly below the spoiler, and a rotating seat is fixedly connected to the bottom inner wall of the annular shell, the rotating seat being rotatably connected to the movable rod.

[0015] A method for monitoring the liquid level in a rock wool electric melting furnace, applied to a liquid level monitoring device for a rock wool electric melting furnace, characterized in that the method includes the following steps: S1: Fix the device directly above the through hole on the top of the electric furnace using the base, ensuring that the built-in antenna is coaxially aligned with the first antenna. Start the water cooling assembly and inject coolant into the water cooling chamber through the liquid inlet pipe. At the same time, start the external air supply structure to blow air into the air inlet pipe of the purging assembly, so that the purging port continuously blows air onto the surface of the first antenna. S2: The radar level gauge body, together with the parabolic first antenna, transmits and receives radar signals. By utilizing the signal focusing characteristics of the first antenna, it achieves long-distance and accurate monitoring of the low liquid level in the electric furnace and provides real-time feedback of liquid level data. S3: When the radar level gauge detects that the liquid level has risen to the preset threshold, the motor of the switching component is started. Through the alternating meshing of the active wheel and the driven wheel, and the linkage between the transmission wheel and the transmission belt, the first antenna and the second antenna in the horn shape are driven to descend and separate and rotate to switch positions. At the same time, the spoiler is driven to descend through gear transmission, the water cooling circulation path is switched and the purging channel is switched to the purging pipe. S4: The second antenna with a horn-shaped aperture receives radar reflection signals in a concentrated manner, and the purge pipe is used to remove interference from high-concentration flue gas by directional purging. At the same time, the water-cooling circulation with a shortened path is used to quickly cool down the liquid, so as to achieve accurate monitoring under high liquid level and high flue gas temperature conditions. When the liquid level drops below the threshold, the motor runs in reverse to reset all components and restore the low liquid level monitoring mode.

[0016] The beneficial effects of this invention are: This invention provides a liquid level monitoring device and method for a rock wool electric melting furnace. Through the inclusion of a water-cooling component and a purging component, it addresses the issue that the electric melting furnace easily generates a large amount of smoke and dust during rock wool melting. Furthermore, the first antenna, which is parabolic in shape, has a large exposed surface area, making it prone to scale buildup and affecting the accuracy of subsequent monitoring results. To address this, a strong airflow is forced into the air inlet pipe via an external air supply structure. This strong airflow enters the air guide cavity and exits through the purging port, which is angled. This angled purging port allows the airflow to precisely target the surface of the first antenna. It can efficiently blow away attached dust and dirt, preventing dirt from blocking signals and causing monitoring errors. It can also assist in cooling the first antenna, preventing high-temperature environments from affecting antenna performance. While the purging component is working, the water-cooling component injects coolant into the water-cooling cavity of the annular shell through the liquid inlet pipe. The flow path of the cold water is extended by the staggered baffles in the water-cooling cavity, allowing the cold water to fully exchange heat with the flange and the radar level gauge body. This not only prevents high-temperature environments from affecting the service life of the equipment, but also makes full use of the cooling capacity in the water-cooling component.

[0017] This invention provides a liquid level monitoring device and method for a rock wool electric melting furnace. Through a switching component, when the radar level gauge detects that the liquid level inside the furnace has risen to a rated threshold, the motor starts. The motor drives the third rotating column to rotate synchronously, which in turn drives the driving wheel to rotate. Because the driving wheel only has meshing teeth on half of its circumference, it can alternately mesh with the second and third driven wheels on both sides. Firstly, when the driving wheel meshes with the second driven wheel, it drives the first threaded screw to rotate. Through the sliding cooperation of the first threaded sleeve with the guide cylinder and guide column, combined with the smooth guidance of the slider along the annular groove, the first and second antennas descend synchronously with the first threaded sleeve. At this time, the first antenna moves to the bottom of the water-cooling assembly and separates from the built-in antenna. Subsequently, as the driving wheel continues to rotate... At this time, the driving wheel meshes with the third driven wheel, enabling it to rotate. When the third driven wheel rotates, it drives the first driven wheel, which meshes with it, to rotate. After the first driven wheel rotates, it is driven by the first rotating column, the first transmission wheel, the transmission belt, and the second transmission wheel, which enables the second rotating column to drive the connecting plate to make a circular motion. This allows for the precise switching of the parabolic first antenna and the trumpet-shaped second antenna. As the liquid level in the electric furnace gradually rises, the concentration of flue gas discharged from the through hole also increases. At this time, the trumpet-shaped second antenna can achieve concentrated reception of radar reflection signals, improving the monitoring accuracy of the liquid level inside the electric furnace. This effectively adapts to the monitoring needs under high liquid level conditions in the electric furnace and enhances the adaptability of the equipment to operating conditions.

[0018] This invention provides a liquid level monitoring device and method for a rock wool electric melting furnace. During the process of exchanging the positions of the first and second antennas through a switching component, the small gear disk on the third rotating column simultaneously meshes with the large gear disk, driving the second lead screw to rotate. This causes the second threaded sleeve to drive the first connecting column to slide vertically along the limiting groove, thereby driving the baffle plate to descend through the annular frame. During the descent of the baffle plate, the bottom baffle covers one side of the purge port, sealing it. Simultaneously, the descending baffle plate presses against one end of the movable rod. At this time, the movable rod, forming a seesaw structure, causes the sealing plate at its other end to tilt upwards. At this point, the strong air blown into the air inlet pipe by the external air supply structure converges in the air guide cavity and is then directed through the purge pipe at a 20°-30° angle to the vertical direction to the repositioned second antenna. This angle setting allows the airflow to precisely target the horn end of the second radar, efficiently dispersing the high-concentration flue gas concentrated at the horn, preventing the flue gas from obstructing the radar signal, ensuring smooth signal transmission and monitoring accuracy. As the liquid level in the electric furnace rises, the temperature of the environment around the radar level gauge also increases. At this time, due to the lowering of the baffle in the cooling assembly, the flow path of the cold water inside the entire cooling chamber is significantly shortened, resulting in a significant increase in the cold water circulation speed within the cooling chamber. This allows for faster removal of the heat absorbed by the flange and the radar level gauge, forming a "rapid cooling" mode that is precisely adapted to the high-temperature operating conditions under high liquid levels, preventing damage to the equipment due to sudden temperature rises. At the same time, the sealing rings of the baffle and the inner wall of the lifting tank remain sealed to prevent cold water leakage and ensure the stable operation of the water cooling system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall front structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the overall bottom structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the overall half-sectional structure of the present invention.

[0023] Figure 4 For the present invention Figure 3 A magnified structural diagram of point A in the middle.

[0024] Figure 5 For the present invention Figure 3 A magnified structural diagram at point B in the middle.

[0025] Figure 6 This is a schematic diagram of the internal structure of the protective shell of the present invention.

[0026] Figure 7 For the present invention Figure 6 A magnified structural diagram at point C.

[0027] Figure 8 This is a schematic diagram of the internal structure of the annular shell of the present invention.

[0028] In the picture: 1. Radar level gauge body; 2. Flange; 3. Protective housing; 4. Inlet pipe; 5. Outlet pipe; 6. Motor; 7. First connecting column; 8. First rotating column; 9. First transmission wheel; 10. Transmission belt; 11. Base; 12. Fixing plate; 13. Annular shell; 14. Purge pipe; 15. First antenna; 16. Support plate; 17. Connecting plate; 18. Second transmission wheel; 19. Second rotating column; 20. Guide cylinder; 21. Circular groove; 22. First threaded screw; 23. Second antenna; 24. Purge port; 25. Guide post; 26. Second connecting post; 27. Limiting groove; 28. Built-in antenna; 29. ​​First driven wheel; 30. Slider; 31. Second driven wheel; 32. Driving wheel; 33. First threaded sleeve; 34. Spoiler; 35. Partition; 36. Baffle; 37. Sealing plate; 38. Movable rod; 39. Rotating seat; 40. Third driven wheel; 41. Third rotating post; 42. Large gear disk; 43. Second threaded sleeve; 44. Second lead screw; 45. Small gear disk; 46. Horizontal plate; 47. Ring frame. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0030] Please see Figures 1-8 A liquid level monitoring device for a rock wool electric melting furnace includes a base 11 fixedly connected to the top of the electric melting furnace, a fixing plate 12 fixedly connected to the top of the base 11, a flange 2 fixedly connected to the fixing plate 12 by bolts, a radar liquid level gauge body 1 fixedly connected to the top of the flange 2, an internal antenna 28 provided at the bottom of the radar liquid level gauge body 1, and a first antenna 15 provided on the outer cover of the internal antenna 28. A second antenna 23 is provided below the fixed plate 12; The top of the fixing plate 12 is provided with a transposition assembly for interchange of the positions of the first antenna 15 and the second antenna 23; The bottom of the fixing plate 12 is fixedly connected to a purging assembly for preventing scale buildup on the outer wall of the first antenna 15 and a water cooling assembly for cooling the radar level gauge body 1 and the flange 2. The radar level gauge body 1 is installed through the base 11, fixing plate 12, and flange 2. It is equipped with the first antenna 15 and the second antenna 23, which can be interchanged through the switching assembly. The purging assembly prevents scale buildup, and the water cooling assembly cools the water, thus achieving accurate monitoring.

[0031] Furthermore, the transposition assembly includes a protective shell 3 fixedly connected to the top outer wall of the fixed plate 12. A motor 6 is fixedly connected to the top outer wall of the protective shell 3. A third rotating column 41 is fixedly connected to the output end of the motor 6. A driving wheel 32 is fixedly connected to the circumferential outer wall of the third rotating column 41. A second driven wheel 31 and a third driven wheel 40 are distributed on both sides of the driving wheel 32. A first driven wheel 29 is engaged with the circumferential outer wall of the third driven wheel 40. Both the second driven wheel 31 and the third driven wheel 40 can cooperate with the driving wheel 32. Only half of the teeth on the circumferential outer wall of the driving wheel 32 can be engaged. A first threaded screw 22 is fixedly connected to the circumferential inner wall of the second driven wheel 31. A first threaded sleeve 33 is threadedly connected to the circumferential outer wall of the first threaded screw 22. A connecting plate 17 is rotatably connected to the bottom end of the first threaded screw 22. A second rotating column 19 is fixedly connected to the bottom outer wall of the connecting plate 17. A support plate 16 is fixedly connected to the bottom outer wall of the fixed plate 12. The second rotating column 19 is rotatably connected to the support plate 16. A second transmission wheel 18 is fixedly connected to the circumferential outer wall of the second rotating column 19. A transmission belt 10 is drivenly connected to the circumferential outer wall of the second transmission wheel 18. The second transmission wheel 18 is drivenly connected to the first transmission wheel 9 through the transmission belt 10. A first rotating column 8 is fixedly connected to the circumferential inner wall of the first transmission wheel 9. One end of the first rotating column 8 extending into the protective shell 3 is fixedly connected to the first driven wheel 29. A guide column 25 is fixedly connected to the top outer wall of the connecting plate 17. The circumferential outer wall of the guide column 25 slides. A guide cylinder 20 is connected, and the guide cylinder 20 is fixedly connected to the first threaded sleeve 33. Two second connecting posts 26 are fixedly connected to the outer circumference of the first threaded sleeve 33. The two second connecting posts 26 are arranged vertically, and the other ends of the two second connecting posts 26 are fixedly connected to the first antenna 15 and the second antenna 23, respectively. When the radar level gauge body 1 detects that the liquid level inside the electric furnace has risen to the rated threshold, the motor 6 starts. The motor 6 drives the third rotating column 41 to rotate synchronously. On the one hand, it drives the driving wheel 32 to rotate. Since the driving wheel 32 only has meshing teeth on half of its circumference, it can alternately mesh with the second driven wheel 31 and the third driven wheel 40 on both sides. When the driving wheel 32 meshes with the second driven wheel 31, it drives the first threaded screw 22 to rotate. The threaded sleeve 33 slides in conjunction with the guide cylinder 20 and the guide post 25. Combined with the smooth guidance of the slider 30 along the annular groove 21, the first antenna 15 and the second antenna 23 descend synchronously with the first threaded sleeve 33. At this time, the first antenna 15 moves to the bottom of the water-cooling assembly and separates from the built-in antenna 28. Subsequently, as the driving wheel 32 continues to rotate, it meshes with the third driven wheel 40, enabling it to rotate. When the third driven wheel 40 rotates, it drives the first driven wheel 29, which meshes with it, to rotate. After the first driven wheel 29 rotates, it is driven by the first rotating column 8, the first transmission wheel 9, the transmission belt 10, and the second transmission wheel 18, thereby enabling the second rotating column 19 to drive the connecting plate 17 to perform a circular motion.This allows for precise repositioning of the parabolic first antenna 15 and the horn-shaped second antenna 23. As the liquid level inside the electric furnace gradually rises, the concentration of flue gas discharged through the through-hole also increases. At this time, the horn-shaped second antenna 23 enables concentrated reception of radar reflection signals, improving the monitoring accuracy of the liquid level inside the electric furnace. This effectively adapts to the monitoring needs under high liquid level conditions inside the electric furnace, enhancing the equipment's adaptability to different operating conditions.

[0032] Furthermore, a circular groove 21 is provided on the bottom outer wall of the fixing plate 12, and a slider 30 is fixedly connected to the end of the guide post 25 away from the connecting plate 17. The slider 30 is slidably connected to the circular groove 21, which ensures the stability of the guide post 25 in guiding and limiting the guide cylinder 20 on its outer wall.

[0033] Furthermore, the cross-section of the first antenna 15 is parabolic, and the cross-section of the second antenna 23 is funnel-shaped. The parabolic shape of the first antenna 15 can enhance the signal focusing effect and increase the monitoring of the liquid level inside the electric furnace. The funnel-shaped second antenna 23 can realize the centralized reception of radar reflected signals and improve the monitoring accuracy of the liquid level inside the electric furnace.

[0034] Furthermore, the purging assembly includes an annular shell 13 fixedly connected to the bottom outer wall of the fixed plate 12. A partition 35 is fixedly connected to the inner circumference of the annular shell 13. The partition 35 and the bottom inner wall of the annular shell 13 form an air guide cavity. An air inlet pipe is fixedly connected to the bottom outer wall of the annular shell 13. Purging ports 24 are evenly spaced and circularly distributed on the outer circumference of the annular shell 13 for purging and cooling the surface of the first antenna 15. The cross-section of the purging ports 24 is sloped. The purging ports 24 are connected to the air guide cavity. Since the electric furnace easily generates a large amount of smoke and dust when melting rock wool, and it is... The parabolic first antenna 15 has a large exposed surface area, which makes it easy for dirt to accumulate on the surface and affect the accuracy of subsequent monitoring results. At this time, strong air is blown into the air inlet pipe through the external air supply structure. After the strong air enters the air guide cavity, it is discharged through the purge port 24. The purge port 24 is set at an angle, which allows the airflow to act precisely on the surface of the first antenna 15. This can not only efficiently blow away the attached dust and dirt, avoiding the dirt from blocking the signal and causing monitoring errors, but also play an auxiliary role in cooling the first antenna 15, preventing the high temperature environment from affecting the antenna performance.

[0035] Furthermore, the bottom outer wall of the annular shell 13 is fixedly connected with purge pipes 14 that are evenly spaced in a circular pattern for purging the second antenna 23 after the transposition. The purge pipes 14 are connected to the air guide cavity. The angle between the purge pipes 14 and the vertical direction is 20°-30°. The top of the purge pipes 14 is provided with a sealing plate 37 to ensure its sealing. The strong wind blown into the air inlet pipe by the external air supply structure is gathered in the air guide cavity and then directed through the purge pipes 14 at an angle of 20°-30° to the vertical direction to the transpositioned second antenna 23. This angle setting allows the airflow to act precisely on the horn end of the second antenna 23, which can efficiently disperse the high concentration of smoke concentrated at the horn end, avoid smoke from obscuring the radar signal, and ensure the smoothness of signal transmission and monitoring accuracy.

[0036] Furthermore, the water-cooling assembly includes an inlet pipe 4 and an outlet pipe 5 fixedly connected to the top outer wall of the flange 2. The other ends of the inlet pipe 4 and the outlet pipe 5 are connected to the annular shell 13. The partition plate 35 and the top inner wall of the annular shell 13 form a water-cooling cavity. The top outer wall of the partition plate 35 is provided with equidistant circular staggered lifting grooves. A baffle plate 34 is inserted into the lifting groove. The baffle plate 34 is sealed to the inner wall of the lifting groove by a sealing ring. The baffle plate 34 is equidistantly circular staggered inside the water-cooling cavity. The water-cooling assembly injects coolant into the water-cooling cavity of the annular shell 13 through the inlet pipe 4. The staggered baffle plate 34 in the water-cooling cavity can extend the flow path of the cold water, so that the cold water can fully exchange heat with the flange 2 and the radar level gauge body 1. This not only avoids the high temperature environment from affecting the service life of the equipment, but also makes full use of the cooling capacity in the water-cooling assembly.

[0037] Furthermore, a small gear disk 45 is fixedly connected to the outer circumference of the third rotating column 41. A large gear disk 42 meshes with the outer circumference of the small gear disk 45. A second lead screw 44 is fixedly connected to the inner circumference of the large gear disk 42. A second threaded sleeve 43 is threadedly connected to the outer circumference of the second lead screw 44. A first connecting column 7 is fixedly connected to one side of the outer wall of the second threaded sleeve 43. An annular frame 47 is fixedly connected to the end of the first connecting column 7 away from the second threaded sleeve 43. The annular frame 47 is fixedly connected to the top outer wall of the spoiler 34. A limiting groove 27 is formed on one side of the inner wall of the protective shell 3. The first connecting column 7 is slidably connected to the inner walls on both sides of the limiting groove 27. The inner wall of the protective shell 3 is fixed. A horizontal plate 46 is connected to ensure the stable rotation of the second lead screw 44. As the liquid level in the electric furnace rises, the temperature of the environment where the radar level gauge body 1 is located will also rise. At this time, after the baffle 34 in the cooling assembly descends, the flow path of cold water inside the entire cooling chamber will be greatly shortened, and the circulation speed of cold water in the cooling chamber will be significantly improved. This will allow the heat absorbed by the flange 2 and the radar level gauge body 1 to be carried away more quickly, forming a "rapid cooling" mode. This mode is precisely adapted to the high temperature working conditions under high liquid levels, preventing the equipment from being damaged by a sudden temperature rise. At the same time, the sealing ring between the baffle 34 and the inner wall of the lifting tank always remains sealed to prevent cold water leakage and ensure the stable operation of the water cooling system.

[0038] Furthermore, a baffle 36 for sealing the purge port 24 is fixedly connected to the bottom outer wall of the spoiler 34, and a movable rod 38 is rotatably connected to the top outer wall of the sealing plate 37. The end of the movable rod 38 away from the sealing plate 37 is located directly below the spoiler 34. A rotating seat 39 is fixedly connected to the bottom inner wall of the annular shell 13. The rotating seat 39 is rotatably connected to the movable rod 38. During the process of exchanging the positions of the first antenna 15 and the second antenna 23 through the switching assembly, the small gear disk 45 on the third rotating column 41 will synchronously mesh with the large gear disk 42, driving the second lead screw 44 to rotate, so that the second threaded sleeve 43 drives the first connecting column 7 to slide vertically along the limiting groove 27, and then drives the spoiler 34 through the annular frame 47. As the spoiler 34 descends, the bottom baffle 36 covers one side of the purge port 24, sealing it. Simultaneously, the descending spoiler 34 presses against one end of the movable rod 38, forming a seesaw structure. This causes the sealing plate 37 at the other end of the movable rod 38 to tilt upwards. At this time, the strong airflow from the external air supply structure into the air inlet pipe converges in the air guide cavity and is then directed through the purge pipe 14, which forms an angle of 20°-30° with the vertical direction, to the repositioned second antenna 23. This angle setting allows the airflow to precisely act on the horn end of the second antenna 23, effectively dispersing the high concentration of smoke concentrated at the horn end, preventing smoke from obstructing the radar signal, and ensuring smooth signal transmission and monitoring accuracy.

[0039] A method for monitoring the liquid level in a rock wool electric melting furnace, applied to a liquid level monitoring device for a rock wool electric melting furnace, characterized in that the method includes the following steps: Step 1: Fix the device directly above the through hole on the top of the electric furnace using the base 11, ensuring that the built-in antenna 28 is coaxially aligned with the first antenna 15. Start the water cooling assembly and inject coolant into the water cooling chamber through the liquid inlet pipe 4. At the same time, start the external air supply structure to blow air into the air inlet pipe of the purging assembly, so that the purging port 24 continuously blows air onto the surface of the first antenna 15.

[0040] Step 2: The radar level gauge body 1, together with the parabolic first antenna 15, transmits and receives radar signals. By utilizing the signal focusing characteristics of the first antenna 15, long-distance and accurate monitoring of the low liquid level in the electric furnace is achieved, and the liquid level data is fed back in real time.

[0041] Step 3: When the radar level gauge body 1 detects that the liquid level has risen to the preset threshold, the motor 6 of the switching component is started. Through the alternating engagement of the driving wheel 32 and the driven wheel, and the linkage between the transmission wheel and the transmission belt, the first antenna 15 and the horn-shaped second antenna 23 are driven to descend and separate and rotate to switch positions. At the same time, the spoiler 34 is driven to descend through gear transmission, the water cooling circulation path is switched and the purging channel is switched to the purging pipe 14.

[0042] Step 4: The second antenna 23 with a horn-shaped opening receives radar reflection signals in a concentrated manner. It works in conjunction with the purge pipe 14 to purge and remove interference from high-concentration flue gas. At the same time, it uses water cooling circulation with a shortened path to quickly cool down the liquid, achieving accurate monitoring under high liquid level and high flue gas temperature conditions. When the liquid level drops below the threshold, the motor 6 reverses to reset all components and restores the low liquid level monitoring mode.

[0043] In summary, with the help of the above-mentioned technical solution of the present invention, when in use, the operator first fixes the entire device to the top of the electric furnace cover via the base 11. At the same time, a through hole needs to be opened at the top of the cover directly below the radar level gauge body 1 to facilitate subsequent level monitoring. When the radar level gauge body 1 monitors the level inside the electric furnace, since the depth of the electric furnace is about 8-10 meters, the built-in antenna 28 is used in conjunction with the externally mounted parabolic first antenna 15 to monitor the level. The parabolic shape of the first antenna 15 can enhance the signal focusing effect and increase the monitoring range of the level inside the electric furnace. However, the electric furnace easily generates a large amount of smoke and dust when melting rock wool, and the first antenna 15, which is parabolic in shape, has a large exposed surface area, which can easily lead to scale buildup on the surface and affect the accuracy of subsequent monitoring results. At this time, strong air is blown into the air inlet pipe through the external air supply structure. After the strong air enters the air guide cavity, it is discharged through the purge port 24. The purge port 24 is set at an angle, which allows the airflow to act precisely on the surface of the first antenna 15. This can not only efficiently blow away the attached smoke and dust, avoiding the scale from blocking the signal and causing monitoring errors, but also provide auxiliary air cooling for the first antenna 15, preventing the high temperature environment from affecting the antenna performance. While the purge component is working, the water cooling component injects coolant into the water cooling cavity of the annular shell 13 through the liquid inlet pipe 4. The flow path of the cold water can be extended by the staggered baffles 34 in the water cooling cavity, so that the cold water can fully exchange heat with the flange 2 and the radar level gauge body 1. This can not only avoid the high temperature environment from affecting the service life of the equipment, but also make full use of the cooling capacity in the water cooling component. When the radar level gauge body 1 detects that the liquid level inside the electric furnace has risen to the rated threshold, the motor 6 starts. The motor 6 drives the third rotating column 41 to rotate synchronously. On one hand, it drives the driving wheel 32 to rotate. Since the driving wheel 32 only has meshing teeth on half of its circumference, it can alternately mesh with the second driven wheel 31 and the third driven wheel 40 on both sides. First, when the driving wheel 32 meshes with the second driven wheel 31, it drives the first threaded screw 22 to rotate. Through the sliding cooperation of the first threaded sleeve 33 with the guide cylinder 20 and the guide column 25, combined with the smooth guidance of the slider 30 along the annular groove 21, the first antenna 15 and the second antenna 23 descend synchronously with the first threaded sleeve 33. At this time, the first antenna 15 moves to the bottom of the water-cooling assembly and separates from the built-in antenna 28. Then, as the driving wheel 32 continues to rotate, the driving wheel 32 and the third driven wheel 40 rotate synchronously. Driven wheel 40 meshes with the third driven wheel 40, which can rotate it. When the third driven wheel 40 rotates, it can drive the first driven wheel 29 meshing with it to rotate. When the first driven wheel 29 rotates, it is driven by the first rotating column 8, the first transmission wheel 9, the transmission belt 10 and the second transmission wheel 18, which can drive the second rotating column 19 to drive the connecting plate 17 to make a circular motion together. This can achieve precise switching between the parabolic first antenna 15 and the trumpet-shaped second antenna 23. As the liquid level in the electric furnace gradually rises, the concentration of flue gas discharged from the through hole will also increase. At this time, the trumpet-shaped second antenna 23 can achieve concentrated reception of radar reflection signals, improve the monitoring accuracy of the liquid level inside the electric furnace, and effectively adapt to the monitoring needs under high liquid level conditions in the electric furnace, thus improving the adaptability of the equipment to operating conditions. Furthermore, during the process of swapping the positions of the first antenna 15 and the second antenna 23 via the transposition assembly, the small gear disk 45 on the third rotating column 41 will synchronously mesh with the large gear disk 42, driving the second lead screw 44 to rotate. This causes the second threaded sleeve 43 to drive the first connecting column 7 to slide vertically along the limiting groove 27, thereby driving the spoiler 34 to descend via the annular frame 47. During the descent of the spoiler 34, the bottom baffle 36 will cover one side of the purge port 24 to seal it. At the same time, the descending spoiler 34 will squeeze the movable rod 3. At one end of 8, the movable rod 38, which forms a seesaw structure, will cause the sealing plate 37 at the other end to tilt up. At this time, the strong wind blown into the air inlet pipe by the external air supply structure will converge in the air guide cavity and then be directed to the second antenna 23 after being swapped through the purge pipe 14 which is at an angle of 20°-30° with the vertical direction. This angle setting allows the airflow to act precisely on the horn end of the second antenna 23, which can efficiently disperse the high concentration of smoke concentrated at the horn end, avoid the smoke from blocking the radar signal, and ensure the smoothness of signal transmission and monitoring accuracy. As the liquid level in the electric furnace rises, the temperature of the environment around the radar level gauge body 1 also increases. At this time, as the baffle 34 descends in the cooling assembly, the flow path of the cold water inside the entire cooling chamber is greatly shortened, significantly increasing the cold water circulation speed in the cooling chamber. This allows the heat absorbed by the flange 2 and the radar level gauge body 1 to be carried away more quickly, forming a "rapid cooling" mode that is precisely adapted to the high-temperature working conditions under high liquid levels. This prevents the equipment from being damaged by a sudden temperature rise. At the same time, the sealing ring between the baffle 34 and the inner wall of the lifting tank always remains sealed to prevent cold water leakage and ensure the stable operation of the water cooling system.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A liquid level monitoring device for an electrically fused rock wool furnace comprising a base (11) fixedly attached to the top of the electrically fused furnace, characterised in that, The top of the base (11) is fixedly connected with a fixed plate (12), the fixed plate (12) is fixedly connected with a flange plate (2) through a bolt, the top of the flange plate (2) is fixedly connected with a radar liquid level meter body (1), the bottom end of the radar liquid level meter body (1) is provided with a built-in antenna (28), the outside cover of the built-in antenna (28) is provided with a first antenna (15); The lower portion of the fixed plate (12) is provided with a second antenna (23); The top of the fixed plate (12) is provided with a transposition assembly for interchanging the positions of the first antenna (15) and the second antenna (23); The bottom of the fixed plate (12) is fixedly connected with a purging assembly for preventing the outer wall of the first antenna (15) from being scaled and a water cooling assembly for cooling the radar liquid level meter body (1) and the flange plate (2).

2. A liquid level monitoring device for an electrically fused rock wool furnace according to claim 1, characterized in that The transposition assembly includes a protective shell (3) fixedly connected to the top outer wall of the fixed plate (12), the top outer wall of the protective shell (3) is fixedly connected with a motor (6), the output end of the motor (6) is fixedly connected with a third rotating column (41), the circumferential outer wall of the third rotating column (41) is fixedly connected with a driving wheel (32), the two sides of the driving wheel (32) are respectively provided with a second driven wheel (31) and a third driven wheel (40), the circumferential outer wall of the third driven wheel (40) is engaged with a first driven wheel (29), the second driven wheel (31) and the third driven wheel (40) can be matched with the driving wheel (32), only half of the circumferential outer wall of the driving wheel (32) can engage the teeth, the circumferential inner wall of the second driven wheel (31) is fixedly connected with a first threaded lead screw (22), the circumferential outer wall of the first threaded lead screw (22) is threadedly connected with a first threaded sleeve (33), the bottom end of the first threaded lead screw (22) is rotatably connected with a connecting plate (17), the bottom outer wall of the connecting plate (17) is fixedly connected with a second rotating column (19), the bottom outer wall of the fixed plate (12) is fixedly connected with a support plate (16), the second rotating column (19) is rotatably connected with the support plate (16), the circumferential outer wall of the second rotating column (19) is fixedly connected with a second transmission wheel (18), the circumferential outer wall of the second transmission wheel (18) is drivingly connected with a transmission belt (10), the second transmission wheel (18) is drivingly connected with a first transmission wheel (9) through the transmission belt (10), the circumferential inner wall of the first transmission wheel (9) is fixedly connected with a first rotating column (8), one end of the first rotating column (8) extending into the protective shell (3) is fixedly connected with the first driven wheel (29), the top outer wall of the connecting plate (17) is fixedly connected with a guide column (25), the circumferential outer wall of the guide column (25) is slidingly connected with a guide cylinder (20), the guide cylinder (20) is fixedly connected with the first threaded sleeve (33), the circumferential outer wall of the first threaded sleeve (33) is fixedly connected with two second connecting columns (26), the two second connecting columns (26) are vertically arranged, the other ends of the two second connecting columns (26) are respectively fixedly connected with the first antenna (15) and the second antenna (23).

3. A liquid level monitoring device for an electrofused rock wool furnace according to claim 2, characterized in that The bottom outer wall of the fixed plate (12) is provided with a circular groove (21), one end of the guide column (25) away from the connecting plate (17) is fixedly connected with a sliding block (30), the sliding block (30) is slidingly connected with the circular groove (21).

4. A liquid level monitoring device for an electro-fusion rock wool furnace as claimed in claim 3, wherein, The cross section of the first antenna (15) is in the shape of a parabola, and the cross section of the second antenna (23) is in the shape of a horn mouth.

5. A liquid level monitoring device for an electrofused rock wool furnace according to claim 4, characterized in that The blowing assembly comprises a ring-shaped shell (13) fixedly connected to the bottom outer wall of the fixed plate (12), the circumferential inner wall of the ring-shaped shell (13) is fixedly connected with a partition plate (35), the partition plate (35) and the bottom inner wall of the ring-shaped shell (13) enclose a wind guide cavity, the bottom outer wall of the ring-shaped shell (13) is fixedly connected with an air inlet pipe, the circumferential outer wall of the ring-shaped shell (13) is provided with blowing ports (24) which are circularly distributed at equal distances and are used for blowing and cooling the surface of the first antenna (15), the cross section of the blowing port (24) is in the shape of a slope, and the blowing port (24) is in communication with the wind guide cavity.

6. A liquid level monitoring device for an electrofused rock wool furnace according to claim 5, characterized in that The bottom outer wall of the ring-shaped shell (13) is fixedly connected with blowing pipes (14) which are circularly distributed at equal distances and are used for blowing the second antenna (23) after transposition, the blowing pipes (14) are in communication with the wind guide cavity, the angle between the blowing pipe (14) and the vertical direction is 20-30 degrees, and the top of the blowing pipe (14) is provided with a sealing plate (37) used for ensuring sealing.

7. A liquid level monitoring device for an electrofused rock wool furnace according to claim 6, characterized in that The water cooling assembly comprises an inlet pipe (4) and an outlet pipe (5) fixedly connected to the top outer wall of the flange plate (2), the other ends of the inlet pipe (4) and the outlet pipe (5) are in communication with the ring-shaped shell (13), the partition plate (35) and the top inner wall of the ring-shaped shell (13) enclose a water cooling cavity, the top outer wall of the partition plate (35) is provided with lifting grooves which are circularly and staggeringly distributed at equal distances, a spoiler (34) is inserted into the lifting groove, the spoiler (34) and the inner wall of the lifting groove are sealingly connected through a sealing ring, and the spoiler (34) is circularly and staggeringly distributed at equal distances inside the water cooling cavity.

8. A liquid level monitoring device for an electrofused rock wool furnace according to claim 7, characterized in that The circumferential outer wall of the third rotating column (41) is fixedly connected with a pinion disc (45), the circumferential outer wall of the pinion disc (45) is engaged with a gear disc (42), the circumferential inner wall of the gear disc (42) is fixedly connected with a second lead screw (44), the circumferential outer wall of the second lead screw (44) is threadedly connected with a second threaded sleeve (43), one side outer wall of the second threaded sleeve (43) is fixedly connected with a first connecting column (7), one end of the first connecting column (7) away from the second threaded sleeve (43) is fixedly connected with a ring-shaped frame (47), the ring-shaped frame (47) is fixedly connected to the top outer wall of the spoiler (34), one side inner wall of the protective shell (3) is provided with a limiting groove (27), the first connecting column (7) is slidingly connected with the two side inner walls of the limiting groove (27), and the inner wall of the protective shell (3) is fixedly connected with a cross plate (46) used for ensuring stable rotation of the second lead screw (44).

9. A liquid level monitoring device for an electrofused rock wool furnace according to claim 8, characterized in that The bottom outer wall of the spoiler (34) is fixedly connected with a baffle (36) used for sealing the blowing port (24), the top outer wall of the sealing plate (37) is rotatably connected with a movable rod (38), one end of the movable rod (38) away from the sealing plate (37) is located directly below the spoiler (34), the bottom inner wall of the ring-shaped shell (13) is fixedly connected with a rotating seat (39), and the rotating seat (39) is rotatably connected with the movable rod (38).

10. A method for monitoring the liquid level of an electrically fused rock wool furnace, applied to the liquid level monitoring device of claim 9, characterized in that, The method comprises the following steps: S1: The device is fixed on the top of the electric furnace through the base (11) directly above the through hole, ensuring that the built-in antenna (28) is coaxially corresponding to the first antenna (15), starting the water cooling assembly, injecting cooling liquid into the water cooling cavity through the liquid inlet pipe (4), and starting the external air supply structure to blow air into the air inlet pipe of the blowing assembly, so that the blowing port (24) continuously blows the surface of the first antenna (15); S2: The radar liquid level meter body (1) cooperates with the parabolic first antenna (15) to emit and receive radar signals, and uses the signal focusing characteristics of the first antenna (15) to realize long-distance accurate monitoring of the low liquid level in the electric furnace, and real-time feedback of the liquid level data; S3: When the radar liquid level meter body (1) detects that the liquid level rises to the preset threshold, the motor (6) of the transposition assembly is started, the first antenna (15) and the horn-shaped second antenna (23) are separated and rotated after descending by the alternating engagement of the driving wheel (32) and the driven wheel, and the linkage of the transmission wheel and the transmission belt, and the spoiler (34) is driven to descend synchronously through the gear transmission, the water cooling circulation path is switched and the blowing channel is switched to the blowing pipe (14); S4: The horn-shaped second antenna (23) concentrates the reception of radar reflection signals, cooperates with the blowing pipe (14) to remove high-concentration smoke gas interference, and uses the shortened water cooling circulation for rapid cooling, so as to realize accurate monitoring under high liquid level and high smoke temperature conditions, and when the liquid level drops below the threshold, the motor (6) is reversely operated to reset each component, and the low liquid level monitoring mode is restored.

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