A vibrating rod level switch

Abstract

The present application belongs to the technical field of material level switches, and particularly relates to a vibrating rod material level switch, which comprises a vibrating rod material level switch body, the control part outer wall of the vibrating rod material level switch body is fixedly connected with an outer cover, the inner wall of the outer cover is fixedly connected with a partition plate, and a plurality of ventilation grooves are formed in the top end of the partition plate. The vibrating rod material level switch has the functions of high-temperature working condition step-by-step heat dissipation, double-active cleaning of the detection rod part, and accurate detection of the material level and temperature and automatic material control, effectively solves the problems of easy thermal damage of internal electronic components, temperature drift and detection misalignment caused by high-adhesion material attachment in a high-temperature environment, avoids the missed judgment of traditional detection and the error of manual material control, greatly reduces the false alarm rate and operation and maintenance cost of the vibrating rod material level switch, prolongs the service life, and significantly improves the operation stability, detection accuracy and automatic adaptation capability of the vibrating rod material level switch under extreme working conditions.

Description

Technical Field

[0001] This invention belongs to the field of material level switch technology, and in particular relates to a vibrating rod material level switch. Background Technology

[0002] Vibrating rod level switches are core level sensing devices in the field of industrial process control. Their core is based on the piezoelectric ceramic driven dual-tube resonant principle. Stable high-frequency vibration is achieved through an inner and outer nested dual-tube structure. When the detection rod of the vibrating rod level switch contacts the material, the resonant frequency changes. This change is captured by the piezoelectric detection device and then processed to output a switch signal, thereby realizing accurate monitoring and start / stop control of the material level in the silo. It is a key basic component for material level control in process industry production. For example, patent CN221826253U discloses a vibrating rod level switch.

[0003] Vibrating rod level switches are widely applicable to the level detection of conventional powder and granular materials in the power and building materials industries. They are also suitable for high-temperature molten materials below 400℃ in the petrochemical and special chemical industries, high-temperature sintered powders in the metallurgical industry, high-temperature roasted materials for positive and negative electrodes of new energy lithium batteries, and measurement scenarios for highly viscous materials such as ultrafine powders of lithium batteries, viscous chemical slurries, highly viscous fly ash, and sludge. Existing vibratory level switches have significant shortcomings under such extreme working conditions. In high-temperature environments, internal electronic components are prone to thermal damage, and temperature drift can lead to inaccurate detection. Furthermore, the continuous adhesion of highly viscous materials to the detection rod can cause misjudgment of the resonant frequency, affecting the accuracy of level detection. In addition, existing vibratory level switches lack active protection and cleaning capabilities, which not only significantly shortens the service life of the equipment but also affects the ease of use of the vibratory level switch and the reliability of level detection.

[0004] Therefore, we propose a vibrating rod level switch to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a vibrating rod level switch.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a vibrating rod level switch, comprising a vibrating rod level switch body, an outer cover fixedly connected to the outer wall of the control part of the vibrating rod level switch body, a partition plate fixedly connected to the inner wall of the outer cover, a plurality of ventilation slots being provided at the top of the partition plate, the partition plate dividing the internal cavity of the outer cover into an air inlet area and an air outlet area. An air extraction mechanism is fixedly connected to the inner wall of the bottom end of the outer cover in the air intake area. An air guiding mechanism is fixedly connected to the inner wall of the bottom end of the outer cover in the air outlet area. The outer cover has a rectangular through hole at the top of the air outlet area, and a cooling mechanism is fixedly connected to the wall of the rectangular through hole. A hexagonal ring is fixedly sleeved on the outer wall of the detection rod of the vibrating rod level switch body. A cover plate is fixedly sleeved on the outer wall of the hexagonal ring. An external threaded ring is fixedly connected to the bottom end of the cover plate. A sealing ring is movably sleeved on the outer wall of the external threaded ring. An auxiliary mechanism for cleaning the outer wall of the detection rod of the vibrating rod level switch body is fixedly connected to the inner wall of the external threaded ring.

[0007] In the above-mentioned vibrating bar level switch, the air extraction mechanism includes a micro PLC controller and a micro air pump fixedly connected to the inner wall of the bottom end of the outer cover. The outer cover has a circular hole on the side wall of the air inlet area, and an L-shaped tube is fixedly connected to the wall of the circular hole. The air outlet end of the L-shaped tube is fixedly connected to the air inlet end of the micro air pump. The input end of the micro PLC controller is electrically connected to an infrared temperature sensor. The outer cover has a wire hole on the side wall of the air inlet area that matches the data line of the infrared temperature sensor. An L-shaped fixing bracket is fixedly connected to the outer wall of the infrared temperature sensor.

[0008] In the above-mentioned vibrating rod level switch, a fine filter cover is fixedly sleeved on the outer wall of the air inlet end of the L-shaped tube, and multiple mounting through holes are opened on the outer walls of both the vertical and horizontal parts of the L-shaped fixing frame.

[0009] In the above-mentioned vibrating bar level switch, the air guiding mechanism includes a fixing ring fixedly connected to the inner wall of the bottom end of the outer cover. A three-way reversing solenoid valve is fixedly connected to the inner wall of the fixing ring. The side outlet of the three-way reversing solenoid valve is fixedly connected to the outer wall of the control part of the vibrating bar level switch body. A conveying pipe is fixedly connected to the bottom outlet of the three-way reversing solenoid valve. The air outlet of the conveying pipe passes through the lower surface of the outer cover and is fixedly connected to the top of the cover plate. A rectangular air outlet is opened on the outer wall of the control part of the vibrating bar level switch body, and a dustproof mesh is fixedly connected to the inner wall of the rectangular air outlet.

[0010] In the above-mentioned vibrating bar level switch, the cooling mechanism includes a metal sheet, the sidewall of which is fixedly connected to the wall of the rectangular through hole at the top of the outer cover, a semiconductor cooling chip is fixedly connected to the upper surface of the metal sheet, a plurality of heat dissipation meshes are fixedly connected to the heat dissipation side of the semiconductor cooling chip, and a plurality of cooling metal meshes are fixedly connected to the cooling side of the metal sheet.

[0011] In the aforementioned vibratory rod level switch, the auxiliary mechanism includes an inclined guide ring fixedly connected to the inner wall of an external threaded ring. The detection rod of the vibratory rod level switch body is located inside the inclined guide ring. A connecting ring is fixedly connected to the lower surface of the cover plate. A damping bearing is fixedly connected to the inner wall of the connecting ring. A rotating ring is fixedly connected to the inner wall of the inner ring of the damping bearing. Multiple fan blades are fixedly embedded in the outer wall of the rotating ring. Two wiping rods for cleaning the outer wall of the detection rod of the vibratory rod level switch body are fixedly connected to the lower surface of the rotating ring. The rod wall of the wiping rod contacts the outer wall of the detection rod of the vibratory rod level switch body.

[0012] In the above-mentioned vibrating bar level switch, the air outlet of the conveying pipe is located directly above the fan blade, and the outer wall of the rotating ring is provided with multiple mounting holes that cooperate with the connecting end of the fan blade.

[0013] In the above-mentioned vibrating rod level switch, an L-shaped block is fixedly connected to the bottom end of each of the two wiping rods. The outer wall of the bottom end of the vibrating rod level switch body detection rod contacts the outer wall of the L-shaped block, and a constraint ring is fixedly connected to the outer wall of the bottom end of the two wiping rods.

[0014] Compared with existing technologies, the advantages of a vibrating rod level switch are: 1. Through the linkage structure of the suction mechanism, air guiding mechanism, and cooling mechanism, each structure works together to achieve stepped intelligent heat dissipation, solving the problems of thermal damage to internal electronic components and temperature drift leading to inaccurate detection under high-temperature conditions. At the same time, it achieves reasonable energy consumption control. The miniature suction pump of the suction mechanism draws outside air into the exhaust area. The three-way reversing solenoid valve of the air guiding mechanism remains connected to the control unit at high temperatures, sending clean air into the equipment to accelerate heat exchange and achieve heat dissipation. The miniature PLC controller adjusts the power of the miniature suction pump step by step according to the temperature detected by the infrared temperature sensor. Low power at low temperatures meets heat dissipation and saves energy, while increasing power at high temperatures enhances heat dissipation. If the miniature suction pump reaches its maximum power and the temperature is still high, the semiconductor cooling chip of the cooling mechanism works to reduce the temperature of the air in the exhaust area and improve the heat dissipation effect. This combination method not only avoids thermal aging and thermal damage to the electronic components in the vibratory bar level switch and solves the problem of inaccurate detection caused by temperature drift, but also reduces energy consumption through power self-adaptation, effectively extending the service life of electronic components and significantly improving the operational stability and detection accuracy of the vibratory bar level switch under high-temperature conditions.

[0015] 2. An active cleaning structure is formed by the auxiliary mechanism, combined with the suction and air guiding mechanisms, achieving thorough cleaning of the vibrating bar level switch's detection rod. This solves the problem of misjudgment of resonant frequency and inaccurate detection caused by highly adhesive materials adhering to the detection rod. It also eliminates the need for manual cleaning, reducing maintenance costs. When the material level reaches the discharge threshold, the micro PLC controller controls the micro suction pump to operate at high power, and the three-way reversing solenoid valve of the air guiding mechanism reverses, blowing clean air through the delivery pipe to the fan blades of the auxiliary mechanism. The cleaning rod is then rotated, and the airflow is guided by the inclined guide ring and then... The surface of the detection rod is uniformly swept in a ring, and the rotating ring drives the wiping rod to rotate 360°. The high-speed airflow first blows away floating dust and loose adhering materials, and then the wiping rod scrapes away stubborn adhering materials. The detached materials are promptly blown away by the airflow to avoid secondary adhesion, which can form a double cleaning effect. Even highly adhesive materials can be thoroughly cleaned, fundamentally solving the problem of detection inaccuracy caused by material adhesion, significantly reducing the false alarm rate of the equipment. There is no need for manual climbing for cleaning, which reduces operation and maintenance costs and eliminates the safety risks of manual operation. After cleaning, the detection rod quickly returns to the normal resonance state, ensuring the accuracy of subsequent detection.

[0016] 3. Through the intelligent linkage structure of the infrared temperature sensor, L-shaped block, and micro PLC controller, combined with the vibrating bar level switch, accurate detection of material level and temperature and automated material control are achieved. This solves the problems of easy missed detection in traditional detection and errors in manual material control, improving the automation and intelligence level of the equipment. The infrared temperature sensor captures the material temperature and converts the signal into an electrical signal, which is then transmitted to the micro PLC controller. The sensor does not contact the material throughout the process, avoiding corrosion damage to the sensor caused by high temperature and highly adhesive materials, thus improving the safety and stability of temperature detection. The L-shaped block at the bottom of the detection bar of the vibrating bar level switch increases the contact area with the material, avoiding partial non-contact caused by the flow of powder and granular materials, eliminating the problem of missed detection of material level, and improving the accuracy of material level detection. This combination eliminates the lag and human error of manual operation, accurately controls the material level in the silo, effectively prevents overflow or shortage of material, and greatly improves the automation efficiency and accuracy of silo material management. The micro PLC controller intelligently adjusts each mechanism based on the temperature signal, enabling the vibratory bar level switch to adapt to different working conditions, thus further improving the overall applicability of the vibratory bar level switch. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a vibrating rod level switch provided by the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure in partial cross-section; Figure 3 yes Figure 2 Enlarged structural diagram of the outer casing section; Figure 4 yes Figure 2 Enlarged structural diagram of the auxiliary mechanism; Figure 5 This is a three-dimensional structural schematic diagram of the rotating ring portion in a vibrating rod level switch provided by the present invention; Figure 6 This is a three-dimensional structural diagram of the partition plate portion in a vibrating rod level switch provided by the present invention.

[0018] In the diagram: 1. Vibrating rod level switch body; 2. Outer cover; 3. Divider plate; 4. Ventilation slot; 5. Air extraction mechanism; 51. Micro PLC controller; 52. Micro air extraction pump; 53. L-shaped tube; 54. Infrared temperature sensor; 55. L-shaped fixing bracket; 6. Air guiding mechanism; 61. Fixing ring; 62. Three-way reversing solenoid valve; 63. Conveying pipe; 64. Dustproof mesh; 7. Cooling mechanism; 71. Metal sheet; 72. Semiconductor cooling chip; 73. Heat dissipation mesh; 74. Cooling metal mesh; 8. Hexagonal ring; 9. Auxiliary mechanism; 91. Inclined guide ring; 92. Connecting ring; 93. Damping bearing; 94. Rotating ring; 95. Fan blade; 96. Wiping rod; 10. Air inlet area; 11. Air outlet area; 12. Cover plate; 13. External threaded ring; 14. Sealing ring; 15. Fine mesh filter cover; 16. Mounting through hole; 17. Mounting hole; 18. L-shaped block; 19. Constraint ring. Detailed Implementation

[0019] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1-6As shown, a vibrating rod level switch includes a vibrating rod level switch body 1. An outer cover 2 is fixedly connected to the outer wall of the control part of the vibrating rod level switch body 1. A partition plate 3 is fixedly connected to the inner wall of the outer cover 2. The top of the partition plate 3 has multiple ventilation slots 4. The partition plate 3 divides the internal cavity of the outer cover 2 into an air inlet area 10 and an air outlet area 11. An air extraction mechanism 5 is fixedly connected to the inner wall of the bottom end of the outer cover 2 in the air inlet area 10. The air extraction mechanism 5 includes a micro PLC controller 51 and a micro air pump 52 fixedly connected to the inner wall of the bottom end of the outer cover 2. The side wall of the outer cover 2 in the air inlet area 10 has multiple ventilation slots 4. A round hole is provided, and an L-shaped tube 53 is fixedly connected to the wall of the round hole. The air outlet end of the L-shaped tube 53 is fixedly connected to the air inlet end of the micro air pump 52. An infrared temperature sensor 54 is electrically connected to the input end of the micro PLC controller 51. A wire hole for matching the data line of the infrared temperature sensor 54 is opened on the side wall of the outer cover 2 located in the air inlet area 10. An L-shaped fixing bracket 55 is fixedly connected to the outer wall of the infrared temperature sensor 54. A fine filter cover 15 is fixedly sleeved on the outer wall of the air inlet end of the L-shaped tube 53. Multiple mounting through holes 16 are opened on the outer walls of both the vertical and horizontal parts of the L-shaped fixing bracket 55.

[0021] An air guiding mechanism 6 is fixedly connected to the inner wall of the bottom end of the outer cover 2 located in the air outlet area 11. The air guiding mechanism 6 includes a fixing ring 61 fixedly connected to the inner wall of the bottom end of the outer cover 2. A three-way reversing solenoid valve 62 is fixedly connected to the inner wall of the fixing ring 61. The side outlet of the three-way reversing solenoid valve 62 is fixedly connected to the outer wall of the control part of the vibrating bar level switch body 1. A conveying pipe 63 is fixedly connected to the bottom outlet of the three-way reversing solenoid valve 62. The air outlet end of the conveying pipe 63 passes through the lower surface of the outer cover 2 and is fixedly connected to the top end of the cover plate 12. A rectangular air outlet is opened on the outer wall of the control part of the vibrating bar level switch body 1, and a dustproof mesh 64 is fixedly connected to the inner wall of the rectangular air outlet.

[0022] The outer cover 2 has a rectangular through hole at the top of the air outlet area 11, and a cooling mechanism 7 is fixedly connected to the wall of the rectangular through hole. The cooling mechanism 7 includes a metal sheet 71, the side wall of the metal sheet 71 is fixedly connected to the wall of the rectangular through hole at the top of the outer cover 2, a semiconductor cooling chip 72 is fixedly connected to the upper surface of the metal sheet 71, a plurality of heat dissipation meshes 73 are fixedly connected to the heat dissipation side of the semiconductor cooling chip 72, and a plurality of cooling metal meshes 74 are fixedly connected to the cooling side of the metal sheet 71.

[0023] A hexagonal ring 8 is fixedly sleeved on the outer wall of the detection rod of the vibrating rod level switch body 1. A cover plate 12 is fixedly sleeved on the outer wall of the hexagonal ring 8. An external threaded ring 13 is fixedly connected to the bottom end of the cover plate 12. A sealing ring 14 is movably sleeved on the outer wall of the external threaded ring 13. An auxiliary mechanism 9 for cleaning the outer wall of the detection rod of the vibrating rod level switch body 1 is fixedly connected to the inner wall of the external threaded ring 13. The auxiliary mechanism 9 includes an inclined guide ring 91 fixedly connected to the inner wall of the external threaded ring 13. The detection rod of the vibrating rod level switch body 1 is located at the inclined... Inside the flow guide ring 91, a connecting ring 92 is fixedly connected to the lower surface of the cover plate 12. A damping bearing 93 is fixedly connected to the inner wall of the connecting ring 92. A rotating ring 94 is fixedly connected to the inner wall of the inner ring of the damping bearing 93. Multiple fan blades 95 are fixedly embedded in the outer wall of the rotating ring 94. Two wiping rods 96 for cleaning the outer wall of the detection rod of the vibrating rod level switch body 1 are fixedly connected to the lower surface of the rotating ring 94. The rod wall of the wiping rod 96 contacts the outer wall of the detection rod of the vibrating rod level switch body 1. The wiping rod 96 is made of stainless steel.

[0024] The air outlet of the conveying pipe 63 is located directly above the fan blade 95. The outer wall of the rotating ring 94 has multiple mounting holes 17 that match the connection end of the fan blade 95. The bottom ends of the two wiping rods 96 are fixedly connected to L-shaped blocks 18. The outer wall of the bottom end of the vibrating rod level switch body 1 contacts the outer wall of the L-shaped block 18. The bottom outer walls of the two wiping rods 96 are fixedly connected to a constraint ring 19.

[0025] The output terminals of the vibratory bar level switch body 1 and the infrared temperature sensor 54 are both electrically connected to the input terminal of the micro PLC controller 51 via wires. The micro air pump 52 is electrically connected to the output terminal of the micro PLC controller 51 via wires. The above-mentioned electrical connections and energizing components are all prior art and will not be described in detail here.

[0026] The operating principle of this invention is described as follows: When the vibrating rod level switch is used for material level detection in the silo, the entire vibrating rod level switch is first installed at the material level detection station of the silo through the external threaded ring 13. The external threaded ring 13, the sealing ring 14, and the cover plate 12 cooperate to ensure the sealing and stability of the vibrating rod level switch body 1 and the installation point in the silo. At this time, the detection rod of the vibrating rod level switch body 1 extends into the silo. Then, the L-shaped fixing bracket 55 is fixedly installed at the inlet of the silo through the bolts and the mounting through hole 16, ensuring that the detection end of the infrared temperature sensor 54 is aligned with the material at the inlet of the silo. The infrared temperature sensor 54 detects the temperature of the material entering the hopper in real time. It then converts the detected material temperature into an electrical signal and feeds it back to the micro PLC controller 51. The infrared temperature sensor 54 uses a non-contact detection principle. By detecting the infrared radiation energy emitted by the material, and utilizing the linear correlation between infrared radiation energy and material temperature, the infrared radiation signal is converted into an electrical signal after internal photoelectric conversion and signal amplification. The entire process requires no direct contact with the material, effectively avoiding corrosion and damage to the sensor from high-temperature and highly adhesive materials, thus improving the safety and stability of temperature detection. When the material submerges the vibration... When the vibrating rod level switch body 1 detects the bottom of the vibrating rod, the L-shaped block 18 expands the contact area of ​​the bottom of the vibrating rod level switch body 1. This increased contact area allows for more thorough contact between the detection rod and the material, effectively avoiding localized non-contact situations caused by the flow of powder or granular materials, eliminating missed detections, and improving the accuracy of level detection. The vibrating rod level switch body 1 operates based on the piezoelectric ceramic driven dual-tube resonance principle. Its internal piezoelectric ceramic driving component drives the inner and outer nested dual-tube structure of the vibrating rod level switch body 1 to generate stable high-frequency resonance. When material contacts the vibrating rod level switch body 1... When the material is detected in area 18 of the vibrating bar and L-shaped block, the resistance of the material will cause a sudden change in the resonant frequency of the vibrating bar. This frequency change will be captured in real time by the piezoelectric detection device and converted into an electrical signal. After the electrical signal is processed by the control unit, a material level compliance signal is sent to the silo control system, which will then automatically control the electric valve at the top of the silo to close and stop feeding. At the same time, it will control the electric valve at the bottom of the silo to open and start discharging. This automated linkage control method eliminates the lag and human error of manual operation, can accurately control the material level in the silo, effectively prevent the silo from overflowing or running out of material, and greatly improve the automation efficiency and accuracy of silo material management. When the material temperature detected by the infrared temperature sensor 54 exceeds the preset high temperature threshold (e.g., 50℃) of the micro PLC controller 51, the micro PLC controller 51 controls the air extraction mechanism 5 and the air guiding mechanism 6 to work. After the micro air pump 52 starts, it draws in ambient air through the L-shaped pipe 53. The fine filter cover 15 at the air inlet end of the L-shaped pipe 53 filters the air, intercepting dust, particulate matter and other impurities in the air, preventing impurities from entering the air path and causing pipe blockage or damage to internal electronic components. The filtered clean air first enters the air inlet area 10 of the outer cover 2, and then flows evenly into the air outlet area through the multiple ventilation slots 4 at the top of the partition plate 3. 11. At this time, the three-way reversing solenoid valve 62 of the air guiding mechanism 6 is kept in the state of being connected to the air inlet and the side outlet, so that clean air is smoothly injected into the control part of the vibrating bar level switch body 1 through the side outlet of the three-way reversing solenoid valve 62, which speeds up the air circulation inside the vibrating bar level switch body 1, quickly removes the heat generated by the operation of the internal electronic components, as well as the heat conducted to the control part by the high-temperature material through the detection rod. After the heat exchange is completed, the hot air is discharged through the dustproof mesh 64 on the outer wall of the control part of the vibrating bar level switch body 1. The dustproof mesh 64 can effectively prevent external dust from flowing back into the control part and avoid the electronic components from being contaminated or damp. Furthermore, as the material temperature detected by the infrared temperature sensor 54 increases, the micro PLC controller 51 will gradually increase the pumping power of the micro air pump 52. When the material temperature is low, the amount of heat transferred to the vibrating bar level switch body 1 is low, and the micro air pump 52 is in a low-power working state. While meeting the basic heat dissipation requirements, the energy consumption of the micro air pump 52 is greatly reduced, saving equipment operating costs. Conversely, the higher the material temperature, the more heat is transferred to the vibrating bar level switch body 1. The higher pumping power can further increase the air flow speed, improve the heat dissipation effect inside the vibrating bar level switch body 1, and avoid thermal aging and thermal damage to the internal electronic components due to high temperature. If the material temperature detected by the infrared temperature sensor 54 is still too high after the micro air pump 52 reaches its maximum suction power, the micro PLC controller 51 will then control the semiconductor cooling chip 72 of the cooling mechanism 7 to work. The cooling side of the semiconductor cooling chip 72 will quickly transfer the cold energy to the cooling metal mesh 74 through the metal sheet 71. The cooling metal mesh 74 will perform forced heat exchange and cooling on the clean air flowing in the air outlet area 11 of the outer cover 2. At the same time, multiple heat dissipation meshes 73 on the heat dissipation side of the semiconductor cooling chip 72 will quickly dissipate the heat generated on the cooling side to the outside, ensuring the cooling efficiency of the semiconductor cooling chip 72. The cooled low-temperature clean air will enter the vibrating bar through the three-way reversing solenoid valve 62. Inside the level switch body 1, the cooling and protection effect is further enhanced. This stepped heat dissipation method, through the coordinated operation of the air extraction mechanism 5, the air guiding mechanism 6, and the cooling mechanism 7, achieves precise heat dissipation by adjusting natural air cooling as needed and strengthening forced cooling for emergency use. This not only solves the industry problem of thermal damage to electronic components inside the vibrating rod level switch body 1 and temperature drift leading to inaccurate detection under high temperature conditions, but also achieves reasonable control of equipment energy consumption. At the same time, the dual protection of the fine filter cover 15 and the dustproof mesh 64 solves the problem of dust entering the air path and contamination of internal components, effectively extending the service life of electronic components and greatly improving the operational stability and detection accuracy of the equipment under high temperature conditions. When the material level detected by the vibrating bar level switch body 1 reaches the target, the vibrating bar level switch body 1 sends a feedback signal to control the material discharge process inside the silo. The feedback signal from the vibrating bar level switch body 1 is also simultaneously transmitted to the micro PLC controller 51. The micro PLC controller 51 controls the micro air pump 52 of the air extraction mechanism 5 to work at high power, and at the same time controls the three-way reversing solenoid valve 62 to be energized and reversed and maintained in this state for a period of time (e.g., 2 minutes). After the three-way reversing solenoid valve 62 is energized, it changes the air guiding direction, so that the air inlet end is connected to the bottom outlet end. The clean air in the air outlet area 11 of the outer cover 2 is quickly injected into the conveying pipe 63 through the bottom outlet end of the three-way reversing solenoid valve 62. The air outlet end of the conveying pipe 63 is directly facing the outside of the rotating ring 94. High-speed airflow is directed vertically towards the fan blades 95 on the wall, causing the rotating ring 94 to rotate smoothly on the damping bearing 93. The damping bearing 93 effectively limits the rotational speed of the rotating ring 94, preventing excessive airflow that could cause it to rotate too fast. This prevents wear on the vibrating rod surface and resonance frequency interference caused by hard contact between the wiping rod 96 and the detection rod, ensuring the stability of the rotation cleaning process. Simultaneously, after entering the cover plate 12 through the conveying pipe 63, the high-speed airflow, under the constraint and guidance of the inclined guide ring 91, flows uniformly downwards in a ring along the surface of the detection rod of the vibrating rod level switch body 1, performing all-round airflow cleaning on the surface of the detection rod. The rotating ring 94 simultaneously drives the lower surface of the detection rod... Two wiping rods 96 rotate 360° around the detection rod, with the rod walls of the wiping rods 96 in close contact with the outer wall of the detection rod. During rotation, they powerfully scrape the highly adhesive, ultrafine dust particles adhering to the surface of the detection rod. Simultaneously, the L-shaped blocks 18 at the bottom of the wiping rods 96 scrape and clean the outer wall at the bottom of the detection rod, achieving thorough cleaning of the entire surface of the detection rod without any dead angles. The constraint rings 19 at the bottom of the two wiping rods 96 effectively prevent deformation or displacement of the wiping rods 96 after long-term rotation, ensuring the fit between the wiping rods 96 and the detection rod and ensuring stable long-term cleaning results. The high-speed cleaning airflow first quickly blows away the floating dust and loose adhering materials on the surface of the detection rod, and then the rotating wiping rods 96 mechanically scrape away the stubborn adhering materials. The material scraped off is promptly blown away from the surface of the detection rod by the continuously flowing airflow, preventing secondary adhesion of the material. This creates a dual cleaning effect of airflow sweeping and mechanical scraping, thoroughly cleaning even highly adhesive materials such as viscous chemical slurries and highly adhesive fly ash. This active cleaning method fundamentally solves the problems of misjudgment of resonant frequency and inaccurate level detection caused by material adhesion on the surface of the existing vibratory level switch detection rod. It significantly reduces the false alarm rate of the equipment, lowers the equipment's operation and maintenance costs, and reduces the safety risks of manual operation. After cleaning, the detection rod can quickly return to its normal resonant state, ensuring the accuracy and reliability of subsequent level detection and effectively improving the equipment's adaptability under high-adhesion conditions.

[0027] 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 vibrating rod level switch, comprising a vibrating rod level switch body (1), characterized in that, The outer wall of the control part of the vibrating rod level switch body (1) is fixedly connected to an outer cover (2), and the inner wall of the outer cover (2) is fixedly connected to a partition plate (3). The top of the partition plate (3) is provided with multiple ventilation slots (4). The partition plate (3) divides the internal cavity of the outer cover (2) into an air inlet area (10) and an air outlet area (11). The outer cover (2) is fixedly connected to the inner wall of the bottom end of the air inlet area (10) by an air extraction mechanism (5); The outer cover (2) is fixedly connected to the inner wall of the bottom end of the air outlet area (11) by an air guiding mechanism (6). The outer cover (2) has a rectangular through hole at the top of the air outlet area (11), and a cooling mechanism (7) is fixedly connected to the wall of the rectangular through hole. The outer wall of the detection rod of the vibrating rod level switch body (1) is fixedly fitted with a hexagonal ring (8), the outer wall of the hexagonal ring (8) is fixedly fitted with a cover plate (12), the bottom end of the cover plate (12) is fixedly connected with an external threaded ring (13), the outer wall of the external threaded ring (13) is movably fitted with a sealing ring (14), and the inner wall of the external threaded ring (13) is fixedly connected with an auxiliary mechanism (9) for cleaning the outer wall of the detection rod of the vibrating rod level switch body (1). The air extraction mechanism (5) includes a micro PLC controller (51) and a micro air pump (52) fixedly connected to the inner wall of the bottom end of the outer cover (2). The outer cover (2) has a round hole on the side wall of the air inlet area (10), and an L-shaped tube (53) is fixedly connected to the wall of the round hole. The air outlet end of the L-shaped tube (53) is fixedly connected to the air inlet end of the micro air pump (52). The input end of the micro PLC controller (51) is electrically connected to an infrared temperature sensor (54). The outer cover (2) has a wire hole on the side wall of the air inlet area (10) that matches the data line of the infrared temperature sensor (54). An L-shaped fixing bracket (55) is fixedly connected to the outer wall of the infrared temperature sensor (54). The air guiding mechanism (6) includes a fixing ring (61) fixedly connected to the inner wall of the bottom end of the outer cover (2). A three-way reversing solenoid valve (62) is fixedly connected to the inner wall of the fixing ring (61). The side outlet of the three-way reversing solenoid valve (62) is fixedly connected to the outer wall of the control part of the vibrating bar level switch body (1). A conveying pipe (63) is fixedly connected to the bottom outlet of the three-way reversing solenoid valve (62). The air outlet of the conveying pipe (63) passes through the lower surface of the outer cover (2) and is fixedly connected to the top of the cover plate (12). A rectangular air outlet is opened on the outer wall of the control part of the vibrating bar level switch body (1), and a dustproof mesh (64) is fixedly connected to the inner wall of the rectangular air outlet. The auxiliary mechanism (9) includes a sloping guide ring (91) fixedly connected to the inner wall of the external threaded ring (13). The detection rod of the vibrating rod level switch body (1) is located inside the sloping guide ring (91). A connecting ring (92) is fixedly connected to the lower surface of the cover plate (12). A damping bearing (93) is fixedly connected to the inner wall of the connecting ring (92). A rotating ring (94) is fixedly connected to the inner wall of the inner ring of the damping bearing (93). A plurality of fan blades (95) are fixedly embedded in the outer wall of the rotating ring (94). Two wiping rods (96) for cleaning the outer wall of the detection rod of the vibrating rod level switch body (1) are fixedly connected to the lower surface of the rotating ring (94). The rod wall of the wiping rod (96) is in contact with the outer wall of the detection rod of the vibrating rod level switch body (1). When the material level reaches the standard for discharge, the micro PLC controller (51) controls the micro air pump (52) to work at high power. The three-way reversing solenoid valve (62) of the air guiding mechanism (6) reverses, and clean air is blown through the conveying pipe (63) to the fan blade (95) of the auxiliary mechanism (9). Then the wiping rod (96) is driven to rotate. At the same time, the airflow is guided by the inclined guide ring (91) and blows evenly along the surface of the detection rod in a ring. The rotating ring (94) drives the wiping rod (96) to rotate 360°.

2. The vibrating rod level switch according to claim 1, characterized in that, The air inlet end of the L-shaped tube (53) is fixedly fitted with a fine filter cover (15), and the vertical and horizontal parts of the L-shaped fixing bracket (55) are provided with multiple mounting through holes (16).

3. The vibrating rod level switch according to claim 1, characterized in that, The cooling mechanism (7) includes a metal sheet (71), the sidewall of which is fixedly connected to the wall of the rectangular through hole at the top of the outer cover (2), a semiconductor cooling chip (72) is fixedly connected to the upper surface of the metal sheet (71), a plurality of heat dissipation meshes (73) are fixedly connected to the heat dissipation side of the semiconductor cooling chip (72), and a plurality of cooling metal meshes (74) are fixedly connected to the cooling side of the metal sheet (71).

4. The vibrating rod level switch according to claim 1, characterized in that, The air outlet of the conveying pipe (63) is located directly above the fan blade (95), and the outer wall of the rotating ring (94) is provided with a plurality of mounting holes (17) that cooperate with the connecting end of the fan blade (95).

5. A vibrating rod level switch according to claim 1, characterized in that, The bottom ends of the two wiping rods (96) are fixedly connected to L-shaped blocks (18), the outer wall of the bottom end of the vibrating rod level switch body (1) contacts the outer wall of the L-shaped block (18), and the bottom outer walls of the two wiping rods (96) are fixedly connected to a constraint ring (19).

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