A complete set of combustible liquid tank farm tank safety monitoring device

Abstract

The present application relates to the technical field of monitoring device, especially to a combustible liquid tank area storage tank safety monitoring complete device, which comprises a storage tank body, two flange barrels are fixedly connected at the top of the storage tank body, mounting flanges are bolted and sealedly installed at the top of the two flange barrels, a radar liquid level meter and a thermometer are fixedly connected at the top of the two mounting flanges respectively, four rotating rods are rotatably connected at the top of the flange barrels, the four rotating rods are sealingly rotatably connected inside the flange barrels, knobs are fixedly connected at the top of the rotating rods, the corresponding knobs are rotated step by step, the rotating frame is first driven to rotate to the middle position, then the two semicircular blocks are driven to rotate towards each other and combine, and the rotating frame is clamped and fixed, then the semicircular blocks and the rotating frame as a whole are driven to move upward by the middle knob, the air inflation sealing ring is inflated and sealed, nitrogen is filled into the flange barrel through the gas exchange joint to replace, and the mounting flange and the radar liquid level meter are safely taken out without emptying the storage tank body.

Description

Technical Field

[0001] This invention relates to the field of monitoring device technology, and in particular to a complete set of devices for safety monitoring of flammable liquid tank farms. Background Technology

[0002] When flammable liquids such as gasoline and diesel are stored in tanks for extended periods or during loading and unloading operations, excessively high liquid levels can easily lead to overflow and leakage. Abnormally high temperatures can cause large amounts of oil and gas to volatilize, posing a risk of combustion and explosion upon contact with open flames or static electricity. Therefore, the operating status of storage tanks needs to be monitored in real time. The complete set of tank safety monitoring equipment is used to continuously monitor the liquid level and temperature of flammable liquid storage tanks online. This equipment consists of a tank thermometer and a radar level gauge. The thermometer is inserted into the oil in the tank to sense temperature changes, while the radar level gauge is installed on the top of the tank, emitting electromagnetic waves downwards and receiving the echo from the liquid surface to measure the actual liquid level in the tank. After being put into operation, both automatically and continuously collect temperature and liquid level signals and transmit them to the duty control room for display. Based on this, operators can monitor the liquid level and temperature of the storage tank at any time, and promptly stop feeding or take cooling measures if abnormalities are detected to ensure the safe operation of the tank area.

[0003] The existing radar level gauges and thermometers are fixed to the top of the storage tank via flanges. The flanges are open from top to bottom, allowing the instruments to be directly connected to the tank interior. When the radar level gauge or thermometer malfunctions and needs repair or replacement, the instrument can only be removed directly from the flange. The oil and gas inside the tank then escapes outward through the open nozzle. To prevent oil and gas leaks from the in-service storage tank from causing safety accidents, the tank must be shut down for feeding and discharging and pressure relief must be performed before maintenance. This results in complicated maintenance procedures, long maintenance time, and disruption to the normal operation of the storage tank.

[0004] Therefore, a complete set of safety monitoring devices for flammable liquid storage tanks in tank farms is proposed to solve the above problems. Summary of the Invention

[0005] To address the technical problem of the inability to replace pressurized seals during the maintenance of existing tank instruments, this invention provides a complete set of safety monitoring devices for flammable liquid tank farms.

[0006] The technical solutions provided by the embodiments of the present invention are as follows: This invention provides a complete set of safety monitoring devices for flammable liquid tank farms, including a tank body. Two flange cylinders are fixedly connected through the top of the tank body. Each flange cylinder has a bolt-sealed mounting flange at its top. A radar level gauge and a thermometer are fixedly connected to the top of each mounting flange, respectively. Four rotating rods are rotatably connected through the top of the flange cylinders. Each of the four rotating rods is rotatably connected inside the flange cylinders. A knob is fixedly connected to the top of each rotating rod. A limit ring is fixedly connected to the top of the flange cylinders relative to the outside of the knobs. The limit rings are provided with a limiting mechanism for limiting the reverse rotation of the knobs. The flange cylinder has a rotating groove at its bottom end. A pair of meshing gears are rotatably connected inside the rotating groove. The bottom end of one of the rotating rods is fixedly connected to the center of the top of one of the gears. A branch rod is fixedly connected through the top of the other gear. Both the branch rod and the rotating rod have rectangular grooves at their bottom ends. A rectangular rod is slidably connected longitudinally inside the rectangular groove. A mounting block is fixedly connected to the bottom end of each rectangular rod. A semi-circular block is fixedly connected to the bottom end of each mounting block located below the two gears. An upper spring is fixedly connected between the top of the rectangular rod and the top of the rectangular groove. A straight groove is formed on the side of the semi-circular block that is close to each other.

[0007] In the above technical solution, a pair of ventilation connectors with ball valves are fixedly connected through the top of the mounting flange. The ventilation connectors with ball valves are used to connect external ventilation equipment to fill the flange cylinder with nitrogen, so as to achieve safe replacement of the gas inside the storage tank. The top of the mounting flange is provided with grooves at the position above the knob. The grooves are designed to accommodate the knob, prevent the knob from protruding from the surface of the mounting flange, ensure that the top surface of the mounting flange is flat, facilitate the installation and arrangement of the radar level gauge and thermometer, and prevent the knob from being accidentally rotated by external force.

[0008] In the above technical solution, furthermore, an air-expanding sealing ring is fixedly connected through the inner wall of the straight groove and the top of the semi-circular block. An air-expanding joint is fixedly connected to the top of the mounting flange. The air-expanding joint and the air-expanding sealing ring are fixedly connected by an air pipe. An air-expanding sealing ring is fixedly connected to the inner wall of the straight groove and the top of the semi-circular block. An air-expanding joint is provided at the top of the mounting flange. The air-expanding joint and the air-expanding sealing ring are connected by an air pipe. During pressurized maintenance, the air-expanding joint is connected to an air pump. After the air pump inflates the air-expanding joint, the air-expanding sealing ring expands and deforms, tightly fitting against the end face of the rotating frame and the bottom face of the flange, forming an end face seal and a radial seal. This effectively prevents the flammable liquid vapor in the storage tank from leaking outward along the flange, providing a reliable sealing barrier for disassembling instruments under pressure.

[0009] In the above technical solution, the limiting mechanism further includes a pawl, and the knob has a U-shaped groove inside. The pawl is laterally slidably connected to the lateral end of the bottom of the U-shaped groove. A limiting spring is fixedly connected between the side wall of the pawl and the inner wall of the U-shaped groove. The inner wall of the limiting ring has several limiting grooves with inclined surfaces at equal intervals. The pawl is inserted into the inner side of one of the limiting grooves. An L-shaped rod is fixedly connected to the top of the pawl. The L-shaped rod is laterally slidably connected to the top of the U-shaped groove. By setting the limiting mechanism, the knob can only rotate in one direction and be positioned step by step, preventing the knob from turning back and loosening due to internal pressure or vibration of the storage tank. Moving the L-shaped rod can drive the pawl to disengage from the limiting groove and unlock it, making it convenient for the operator to adjust the knob angle as needed.

[0010] In the above technical solution, further, a rotating frame is rotatably connected to the outer wall of one of the mounting blocks on the side away from the rotating groove. One end of the rotating frame is inserted into the inside of the straight groove, and the rotating frame completely seals the straight groove. Sealing strips are fixedly connected to both sides of the top of the rotating frame. One end of the rotating frame can be inserted into the straight groove to completely seal it, and sealing strips are provided on both sides of the top to enhance the seal. The outer walls of the other two mounting blocks located between the rotating frame and the gear are fixedly connected with fixing rings. The upper and lower sides of the outer walls of the fixing rings are fixedly connected with upper and lower rods, respectively. A circular groove is opened at the bottom end of the flange cylinder relative to the position above the fixing ring. The fixing ring is inserted into the inner side of the circular groove. The two semicircular blocks have slots for inserting the lower rod on opposite sides. The top of the slot has an inclined groove. The circular groove has a pressing groove. The pressing groove is arranged in a spiral shape and its extension arc is a quarter circumference. A horizontal annular groove is opened at the bottom end of the pressing groove and communicates with it. The horizontal annular groove extends horizontally and surrounds a half circumference. The upper rod is inserted into the inner side of the pressing groove.

[0011] The upper rod on the fixed ring is inserted into the extrusion groove. When the knob drives the mounting block to rotate, the upper rod spirals down along the extrusion groove, thereby driving the fixed ring and the lower rod to move downwards, so that the lower rod extends out of the inner side of the circular groove. Then, with the continued rotation of the mounting block and the fixed ring, the lower rod will be driven to insert into the slot. At the same time, the upper rod rotates in the horizontal ring groove. Then, with the continued rotation of the fixed ring, the lower rod will be driven to press the inclined surface of the inclined groove, thereby pressing the semi-circular block to move upwards, so as to achieve sealing and pressure maintenance of the flange cylinder. The extrusion groove presses the fixed ring and the upper rod down, and the reverse rotation is used to press the fixed ring and the upper rod up, thereby storing the fixed ring in the circular groove and avoiding obstructing the normal opening of the semi-circular block.

[0012] In the above technical solution, a positioning rod is fixedly connected to the top of the rotating frame, and a half-circular positioning groove is opened at the bottom of the flange cylinder relative to the position above the rotating frame. The positioning rod is inserted into the inner side of the positioning groove, and the rotating frame is rotatably connected to the bottom of the flange cylinder. The above structure is used to limit the rotation angle of the rotating frame, so that it can only rotate within a specified semicircle, ensuring that the rotating frame can accurately rotate to the middle position of the straight groove or flip to the side of the thermometer probe, preventing the rotating frame from rotating excessively and causing positional deviation, and ensuring the alignment accuracy of the rotating frame and the semicircular block.

[0013] In the above technical solution, further, a storage groove is provided on the side of the rotating frame away from the semicircular block. A rubber block is slidably connected to the inner side of the storage groove. A round rod is fixedly connected to the side wall of the rubber block. The side wall of the round rod passes through the inner side of the rotating frame. A lower spring is fixedly connected between the side wall of the rubber block and the inner wall of the storage groove. The side end of the round rod is set as a smooth arc surface. A pair of fixing plates are fixedly connected to the inner side of the rotating frame. A push plate is fixedly connected to the outer wall of the mounting block located in the rotating frame. The push plate is arranged between the fixing plates and is in contact with the side wall of one of the fixing plates. A push spring is fixedly connected between the side wall of the push plate and the side wall of the other fixing plate. A squeezing block is fixedly connected to the outer wall of the mounting block located in the rotating frame. The side wall of the squeezing block is inclined. By rotating the knob counterclockwise, the mounting block and push plate rotate, which in turn pushes the fixing plate to rotate the rotating frame. This causes the rotating frame with the arc-shaped head to rotate to the center position directly below the flange cylinder. By rotating the knob and rotating frame clockwise, the rubber block rotates to the side of the probe. Then, by continuing to rotate the knob and mounting block, the rotating frame cannot continue to rotate due to the restriction of the positioning rod and positioning groove. Therefore, the push plate will compress the push spring, and the squeezing block and push plate continue to rotate. This causes the squeezing block's inclined surface to squeeze the round rod, making the rubber block extend out and fit against the outer wall of the thermometer's probe, while simultaneously stretching the lower spring.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses a step-by-step rotation of the corresponding knobs to first drive the rotating frame to the middle position, then drive the two semicircular blocks to rotate towards each other and merge, clamping and fixing the rotating frame. Subsequently, the two middle knobs are rotated simultaneously to drive the semicircular blocks and the rotating frame to move upward as a whole, so that the air expansion sealing ring is inflated and sealed. In conjunction with the air exchange connector, nitrogen is injected into the flange cylinder to replace it, so that the installation flange and radar level gauge can be safely removed without emptying the storage tank body, avoiding the leakage of flammable liquid vapor and ensuring the safety of maintenance operations.

[0015] 2. In this invention, when removing a thermometer under pressure, the corresponding knob is rotated in the opposite direction to flip the rotating frame next to the thermometer probe. By continuing to rotate the knob, the rubber block is pushed out and tightly adheres to the outer wall of the thermometer probe to form a seal. Then, the two semicircular blocks rotate towards each other and clamp the rotating frame. Then, the two knobs in the middle are rotated simultaneously to drive the whole unit to rise. After the air-expanding sealing ring is inflated and sealed and then purged with nitrogen, the thermometer can be safely unscrewed for maintenance and replacement while the tank body is under pressure. This allows the flange cylinder structure to have dual functions. The same safety monitoring device can not only work with the rotating frame and semicircular blocks to safely remove the radar level gauge, but also use the rotating frame to flip and adhere to the rubber block to replace the thermometer under pressure. There is no need to set up separate interfaces for different instruments, which simplifies the top structure of the tank, reduces equipment costs, and improves the versatility of the flange cylinder and the integration of the monitoring device. Attached Figure Description

[0016] Figure 1 This is a frontal perspective structural diagram of the storage tank body, radar level gauge, and thermometer of the present invention. Figure 2 for Figure 1 A magnified view of the structure at point A in the middle; Figure 3 This is a top view of the radar level gauge and the separation of the mounting flange and flange cylinder of the present invention. Figure 4 This is a bottom-view three-dimensional structural diagram of the flange cylinder and the semi-circular block of the present invention. Figure 5 This is a bottom-view perspective view of the flange cylinder, semi-circular block, and rotating frame of the present invention during sealing. Figure 6 This is a bottom-view perspective view of the flange cylinder, semi-circular block, and thermometer of the present invention. Figure 7 This is a partial cross-sectional three-dimensional structural diagram of the flange cylinder and the circular groove of the present invention; Figure 8 This is a top-view perspective schematic diagram of the semicircular block, rotating frame, rotating rod, and knob of the present invention. Figure 9 for Figure 8 A magnified schematic diagram of the structure at point B in the middle; Figure 10 This is a bottom-view, partially separated three-dimensional structural diagram of the rotating rod, mounting block, and fixing ring of the present invention; Figure 11 This is a partial cross-sectional three-dimensional structural diagram of the knob and limiting ring of the present invention; Figure 12 This is a bottom-view, partially sectional, three-dimensional structural diagram of the rotating frame and mounting block of the present invention; Figure 13This is a three-dimensional side view of the gear and semi-circular block of the present invention; Figure 14 This is a schematic diagram of the three-dimensional structure of the semicircular block and gear side separation of the present invention.

[0017] In the diagram: 1. Tank body; 2. Flange; 3. Mounting flange; 4. Radar level gauge; 5. Thermometer; 6. Rotating rod; 7. Knob; 8. Limiting ring; 9. Rotating groove; 10. Gear; 11. Dividing rod; 12. Rectangular groove; 13. Rectangular rod; 14. Mounting block; 15. Semicircular block; 16. Ventilation connector; 17. Groove; 18. Straight groove; 19. Air expansion seal ring; 20. Air expansion connector; 21. Air pipe; 22. Upper spring; 23. Pawl; 24. U 25. Slot; 26. Limiting spring; 27. Limiting slot; 28. L-shaped rod; 29. ​​Rotating frame; 30. Sealing strip; 31. Fixing ring; 32. Upper rod; 33. Lower rod; 34. Circular slot; 35. Extrusion slot; 36. Horizontal ring slot; 37. Positioning rod; 38. Positioning slot; 39. Storage slot; 40. Rubber block; 41. Round rod; 42. Lower spring; 43. Fixing plate; 44. Push plate; 45. Push spring; 46. Extrusion block; 47. Slot; 48. Inclined slot. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0020] In actual use, it was found that the existing radar level gauge 4 and thermometer 5 are fixed to the top of the tank body 1 through the flange 2. The flange 2 is open from top to bottom, so that the instrument is directly connected to the space inside the tank. When the radar level gauge 4 or thermometer 5 malfunctions and needs to be repaired or replaced, the instrument can only be taken out directly from the flange 2. The oil and gas in the tank will then escape outward through the open cylinder. In order to avoid oil and gas leakage from the in-service tank and cause safety accidents, the tank must be stopped from feeding and discharging and pressure was released before maintenance. This makes the maintenance process cumbersome, time-consuming and affects the normal operation of the tank. To solve the above problems, the following structure was invented.

[0021] like Figures 1-14The illustrated complete set of safety monitoring equipment for flammable liquid storage tanks includes a tank body 1. Two flange cylinders 2 are fixedly connected through the top of the tank body 1. Each flange cylinder 2 is bolted to a mounting flange 3. A radar level gauge 4 and a thermometer 5 are fixedly connected to the top of the two mounting flanges 3, respectively. The radar level gauge 4 emits microwave signals into the tank body 1. The signals are reflected by the surface of the flammable liquid and captured by a receiver. The system accurately calculates the liquid level height based on the time difference between the emission and the echo, realizing non-contact real-time monitoring of the liquid level in the tank. It is unaffected by liquid density and vapor, and the measurement is stable and reliable. The thermometer 5 extends into the tank body 1 through its temperature probe, directly contacting or sensing the flammable liquid at close range. It collects liquid temperature data in real time and transmits it to the monitoring system to monitor changes in liquid temperature in the tank, detect abnormal temperature rises in a timely manner, and prevent safety hazards caused by overheating. Four rotating rods 6 are rotatably connected through the top of the flange cylinder 2. All four rotating rods 6 are rotatably connected inside the flange cylinder 2 in a sealed manner. A knob 7 is fixedly connected to the top of each rotating rod 6. A limit ring 8 is fixedly connected to the top of the flange cylinder 2 relative to the outside of the knob 7. The limit ring 8 is provided with a limit mechanism for limiting the reverse rotation of the knob 7. The bottom end of the flange cylinder 2 is provided with a rotating groove 9. A pair of meshing gears 10 are rotatably connected inside the rotating groove 9. The bottom end of one of the rotating rods 6 is fixedly connected to the center of the top of one of the gears 10. The top of the other gear 10 is fixedly connected to a branch rod 11. The bottom ends of the branch rod 11 and the rotating rod 6 are both provided with rectangular grooves 12. A rectangular rod 13 is longitudinally slidably connected inside the rectangular groove 12. The bottom ends of the rectangular rods 13 are all fixedly connected with mounting blocks 14. The bottom ends of the mounting blocks 14 located below the two gears 10 are all fixedly connected with semicircular blocks 15. An upper spring 22 is fixedly connected between the top of the rectangular rod 13 and the top of the rectangular groove 12. A straight groove 18 is provided on the side of the semicircular blocks 15 that is close to each other.

[0022] A rotating frame 28 (one end of the rotating frame 28 is flat, and the other end is an arc surface that fits the inner wall of the straight groove 18) is rotatably connected to the outer wall of one of the mounting blocks 14 on the side away from the rotating groove 9. One end of the rotating frame 28 is inserted into the inner side of the straight groove 18, and the rotating frame 28 completely blocks the straight groove 18. Sealing strips 29 are fixedly connected to both sides of the top of the rotating frame 28. With the setting of the sealing strips 29, when the rotating frame 28 rotates to move upward below the flange cylinder 2, the sealing strips 29 are squeezed to ensure the sealing performance inside the flange cylinder 2. A pair of fixing plates 42 are fixedly connected to the inner side of the rotating frame 28. A push plate 43 is fixedly connected to the outer wall of the mounting block 14 located inside the rotating frame 28. The push plate 43 is set between the fixing plates 42, and the push plate 43 is in contact with the side wall of one of the fixing plates 42. A push spring 44 is fixedly connected between the side wall of the push plate 43 and the side wall of the other fixing plate 42.

[0023] A pair of ventilation connectors 16 with ball valves are fixedly connected through the top of the mounting flange 3. The ventilation connectors 16 with ball valves are used to connect external ventilation equipment to fill the flange cylinder 2 with nitrogen, so as to achieve safe replacement of the gas inside the storage tank body 1. The top of the mounting flange 3 is provided with grooves 17 at the position above the knob 7.

[0024] An air expansion sealing ring 19 is fixedly connected through the inner wall of the straight groove 18 and the top of the semi-circular block 15. An air expansion joint 20 is fixedly connected to the top of the mounting flange 3. The air expansion joint 20 and the air expansion sealing ring 19 are fixedly connected through an air pipe 21. During pressurized maintenance, the air expansion joint 20 is connected to the air pump. After the air pump inflates the air expansion joint 20, the air expansion sealing ring 19 expands and deforms, and fits tightly against the end face of the rotating frame 28 and the bottom face of the flange cylinder 2, forming an end face seal and a radial seal. This effectively prevents the flammable liquid vapor in the tank body 1 from leaking outward along the flange cylinder 2, providing a reliable sealing barrier for the disassembly of instruments under pressure.

[0025] The limiting mechanism includes a pawl 23. A U-shaped groove 24 is provided inside the knob 7. The pawl 23 is laterally slidably connected to the lateral end of the bottom of the U-shaped groove 24. A limiting spring 25 is fixedly connected between the side wall of the pawl 23 and the inner wall of the U-shaped groove 24. Several limiting grooves 26 with inclined surfaces are equidistantly provided on the inner wall of the limiting ring 8. The pawl 23 is inserted into the inner side of one of the limiting grooves 26. An L-shaped rod 27 is fixedly connected to the top of the pawl 23. The L-shaped rod 27 is laterally slidably connected to the top of the U-shaped groove 24. Through the setting of the limiting mechanism, the knob 7 can only rotate in one direction and be positioned step by step, preventing the knob 7 from turning back and loosening due to internal pressure or vibration of the storage tank body 1. Moving the L-shaped rod 27 can drive the pawl 23 to disengage from the limiting groove 26 and unlock it, making it convenient for the operator to adjust the angle of the knob 7 as needed.

[0026] The outer walls of the other two mounting blocks 14 located between the rotating frame 28 and the gear 10 are fixedly connected with fixing rings 30. The upper rod 31 and the lower rod 32 are fixedly connected to the upper and lower sides of the outer wall of the fixing ring 30, respectively. The bottom end of the flange cylinder 2 is provided with a circular groove 33 above the fixing ring 30. The fixing ring 30 is inserted into the inner side of the circular groove 33. The semicircular blocks 15 are provided with slots 46 for the insertion of the lower rod 32 on the opposite side. The top of the slot 46 is provided with a slanted groove 47. The circular groove 33 is provided with a pressing groove 34. The pressing groove 34 is arranged in a spiral shape and its extension arc is a quarter circumference. The bottom end of the pressing groove 34 is provided with a horizontal annular groove 35 connected to it. The horizontal annular groove 35 extends in the horizontal direction and its arc is half a circumference. The upper rod 31 is inserted into the inner side of the pressing groove 34.

[0027] When performing pressurized maintenance on the radar level gauge 4, first rotate the corresponding knob 7 (a sign is installed next to the knob 7 on the top of the tank body 1, above the rotating frame 28, to facilitate accurate rotation by maintenance personnel). During the rotation of knob 7, the pawl 23 will rotate. At this time, the inclined surface of the limiting groove 26 will press against the inclined surface of the pawl 23, thereby forcing the pawl 23 to slide into the U-shaped groove 24 and compressing the limiting spring 25. Then, knob 7 will rotate the pawl 23 into another limiting groove 26, releasing the pressure on the pawl 23. Subsequently, the elastic force of the limiting spring 25 will... The pawl 23 is pushed down and inserted into the limiting groove 26. Then, by continuing to rotate the knob 7, the pawl 23 will continue to be squeezed until the knob 7 drives the rotating frame 28 to rotate to the designated position. At this time, the pawl 23 is inserted into the corresponding limiting groove 26. The plane of the limiting groove 26 is in contact with the plane of the pawl 23, which restricts the reverse rotation of the knob 7. This causes the rotating rod 6 to drive the mounting block 14 and the push plate 43 to rotate counterclockwise. At this time, the push plate 43 will push the fixing plate 42 to rotate, and at the same time drive the rotating frame 28 to rotate, rotating one end of the rotating frame 28 to the side of the probe. Then, turn the opposite knob 7, which drives one of the gears 10 to rotate via the rotating rod 6 (at this time, the limiting mechanism is running in the same way, restricting the knob 7 from resetting), thereby driving the other meshing gear 10 to rotate, which in turn drives the dividing rod 11, the rectangular rod 13 and the mounting block 14 to rotate, so that the two semicircular blocks 15 rotate towards each other and merge towards the middle, firmly clamping the rotating frame 28 between them. At this time, the straight groove 18 on the side of the semicircular block 15 that is close to it fits against the end face of the rotating frame 28, further reducing the gap. Then, the two knobs 7 in the middle can be rotated. This will cause the corresponding mounting block 14 and fixing ring 30 to rotate via the rotating rod 6. Since the fixing ring 30 and mounting block 14 slide up and down in the rectangular groove 12 via the rectangular rod 13, and the upper rod 31 slides in the extrusion groove 34, during the rotation of the upper rod 31 by the fixing ring 30 within the extrusion groove 34, the upper rod 31 will be squeezed by the inclined surface of the extrusion groove 34. This causes the upper rod 31 on the fixing ring 30 to spirally descend along the extrusion groove 34 on the inner wall of the circular groove 33 (simultaneously causing the rectangular rod 13 to slide downwards within the rectangular groove 12 and stretching the upper spring 22), and causing the fixing ring 30 and lower rod 32 to extend downwards out of the circular groove 33. The lower rod 32 is inserted into the slot 46 on the side away from the semicircular block 15. At this time, the upper rod 31 slides in the horizontal annular groove 35, which restricts the upper rod 31 and the fixed ring 30 from sliding up and down. As the fixed ring 30 and the lower rod 32 continue to rotate, the lower rod 32 will squeeze the inclined surface of the inclined groove 47 at the top of the slot 46, thereby pushing the semicircular block 15 and the clamped rotating frame 28 to move upward as a whole (during the upward sliding of the semicircular block 15 and the rotating frame 28, the corresponding mounting block 14 and the rectangular rod 13 will slide upward in the rectangular groove 12 and compress the upper spring 22), so that the top of the semicircular block 15 is tightly fitted with the bottom surface of the flange cylinder 2, thereby achieving mechanical sealing and pressure maintenance at the bottom of the flange cylinder 2.

[0028] Then, the air expansion joint 20 is connected to an external air pump, and air is injected into the air expansion sealing ring 19. After it expands and deforms, it fits tightly against the end face of the rotating frame 28 and the bottom face of the flange cylinder 2, forming a reliable end face seal and radial seal, effectively preventing the flammable liquid vapor in the tank body 1 from leaking outward along the flange cylinder 2.

[0029] Finally, open the ventilation connector 16 with the ball valve, connect the external ventilation equipment to fill the flange cylinder 2 with nitrogen, and safely replace the gas inside the storage tank body 1. After the replacement is completed, loosen the bolts on the mounting flange 3 and smoothly remove the radar level gauge 4 from the top of the storage tank body 1. This allows for safe pressurized maintenance and replacement of the radar level gauge 4 without emptying the storage tank. Finally, repeat the above operations in reverse during installation.

[0030] In summary, by rotating the corresponding knobs 7 in stages, the rotating frame 28 is first driven to rotate to the middle position, and then the two semicircular blocks 15 are driven to rotate and merge towards each other, clamping and fixing the rotating frame 28. Subsequently, the two middle knobs 7 are rotated simultaneously to drive the semicircular blocks 15 and the rotating frame 28 to move upward as a whole, so that the air expansion sealing ring 19 is inflated and sealed. In conjunction with the air exchange connector 16, nitrogen is injected into the flange cylinder 2 for replacement, so that the installation flange 3 and radar level gauge 4 can be safely removed without emptying the storage tank body 1, avoiding the leakage of flammable liquid vapor and ensuring the safety of maintenance operations.

[0031] Based on the above embodiments, it was found during use that although the above structure can realize pressurized sealing and replacement when the radar level gauge 4 is damaged, the internal channel of the flange cylinder 2 is still directly connected to the inside of the tank when the thermometer 5 is installed. It is impossible to seal the gap around the probe of the thermometer 5 and the opening at the bottom of the flange cylinder 2. When the thermometer 5 is removed, the oil and gas in the tank still leak out through the cylinder opening. The thermometer 5 can only be repaired and replaced after the storage tank is shut down and depressurized. It is difficult to meet the usage requirements of maintenance without stopping production. In order to solve the above problems, the above structure has been further improved.

[0032] A positioning rod 36 is fixedly connected to the top of the rotating frame 28. A half-circular positioning groove 37 is opened at the bottom of the flange cylinder 2 relative to the position above the rotating frame 28. The positioning rod 36 is inserted into the inside of the positioning groove 37. The rotating frame 28 is rotatably connected to the bottom of the flange cylinder 2. The positioning rod 36 and the positioning groove 37 are used to limit the rotation angle of the rotating frame 28, so that it can only rotate within a specified semicircle. This ensures that the rotating frame 28 can accurately rotate to the middle position of the straight groove 18 or flip to the side of the probe of the thermometer 5, preventing the rotating frame 28 from rotating excessively and causing positional deviation, and ensuring the alignment accuracy between the rotating frame 28 and the semicircular block 15.

[0033] A storage groove 38 is provided on the side of the rotating frame 28 away from the semicircular block 15 (the storage groove 38 is provided on the flat end of the rotating frame 28). A rubber block 39 is slidably connected to the inner side of the storage groove 38. A round rod 40 is fixedly connected to the side wall of the rubber block 39. The side wall of the round rod 40 passes through the inner side of the rotating frame 28. A lower spring 41 is fixedly connected between the side wall of the rubber block 39 and the inner wall of the storage groove 38. The side end of the round rod 40 is set as a smooth arc surface. A pressing block 45 is fixedly connected to the outer wall of the mounting block 14 located inside the rotating frame 28. The side wall of the pressing block 45 is inclined.

[0034] When performing pressurized maintenance on thermometer 5, first turn the knob 7 located above the rotating frame 28 clockwise, so that the rotating rod 6 drives the mounting block 14 and the push plate 43 to rotate synchronously. At this time, the push plate 43 will squeeze and push the spring 44 and the fixing plate 42 to rotate, so that the rotating frame 28 flips around the bottom of the flange cylinder 2 to the side of the probe of the thermometer 5. At the same time, it drives the positioning rod 36 to rotate in the positioning groove 37, restricting the rotating frame 28 to rotate only within a specified semicircle, ensuring that it accurately stops beside the probe without excessive deflection. Then continue to rotate the knob 7. Since the rotating frame 28 is limited by the positioning rod 36 and the positioning groove 37, it cannot continue to rotate. At this time, the push plate 43 compresses and pushes the spring 44. The extrusion block 45 on the outer wall of the mounting block 14 rotates together. It uses its inclined side wall to extrude the smooth arc surface of the round rod 40, overcomes the elastic force of the lower spring 41, and makes the rubber block 39 extend laterally from the storage groove 38 and fit tightly against the outer wall of the probe of the thermometer 5 to form a reliable temporary radial seal. Then, rotate the knob 7 of the control semicircular block 15. Through the meshing gear 10, the two semicircular blocks 15 rotate towards each other and merge in the middle, firmly clamping the rotating frame 28 between them. Then, continue to rotate the knob 7 of the control fixing ring 30, so that the upper rod 31 spirals down along the extrusion groove 34, driving the lower rod 32 to insert into the slot 46 of the semicircular block 15. The lower rod 32 then extrudes the inclined surface of the inclined groove 47, pushing the semicircular block 15 to move upward as a whole until the top of the semicircular block 15 is tightly attached to the bottom surface of the flange cylinder 2, so as to achieve mechanical sealing and pressure maintenance at the bottom of the flange cylinder 2. Then, the air expansion joint 20 is connected to an external air pump, and air is injected into the air expansion sealing ring 19. After it expands and deforms, it fits tightly against the end face of the rotating frame 28 and the bottom face of the flange cylinder 2, forming a reliable end face seal and radial seal, effectively preventing the flammable liquid vapor in the tank body 1 from leaking outward along the flange cylinder 2.

[0035] Finally, open the ventilation connector 16 with the ball valve, connect the external ventilation equipment to fill the flange cylinder 2 with nitrogen, and safely replace the gas inside the storage tank body 1. After the replacement is completed and the seal is confirmed to be reliable, loosen the connecting thread of the thermometer 5, slowly loosen the thermometer 5 from the probe and remove it smoothly. In this way, the pressurized maintenance and replacement of the thermometer 5 can be safely completed without emptying the storage tank body 1. (It should be noted that the thermometer 5 in this safety monitoring kit adopts a detachable probe structure. The thermometer 5 body and the probe are set separately. The probe is fixed to the mounting flange 3 by threads and extends into the storage tank body 1. The thermometer 5 body and the top of the probe are connected by a threaded joint. During pressurized maintenance, after the rubber block 39 and the outer wall of the probe form a seal and maintain pressure, loosen the connecting thread between the thermometer 5 body and the top of the probe, and the thermometer 5 body can be smoothly removed from the probe while the probe remains in the storage tank to maintain a sealed state.)

[0036] In summary, through the design of the above structure, when removing the thermometer 5 under pressure, rotating the corresponding knob 7 in the opposite direction causes the rotating frame 28 to flip to the side of the probe of the thermometer 5. By continuing to rotate the knob 7, the rubber block 39 is pushed out and tightly adheres to the outer wall of the probe of the thermometer 5 to form a seal. Then, the two semicircular blocks 15 rotate towards each other and clamp the rotating frame 28. Then, the two knobs 7 in the middle are rotated simultaneously to drive the whole structure to rise. After the air-expanding sealing ring 19 is inflated and sealed and then replaced with nitrogen, the thermometer 5 can be safely unscrewed for maintenance and replacement under pressure in the tank body 1. Thus, the flange cylinder 2 structure has dual functions. The same safety monitoring device can not only cooperate with the rotating frame 28 and the semicircular blocks 15 to safely remove the radar level gauge 4, but also achieve the pressure replacement of the thermometer 5 by flipping the rotating frame 28 and adhering to the rubber block 39. There is no need to set up independent interfaces for different instruments, which simplifies the top structure of the tank, reduces equipment costs, and improves the versatility of the flange cylinder 2 and the integration of the monitoring device.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention.

[0038] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A complete set of safety monitoring equipment for flammable liquid storage tanks, comprising a storage tank body (1), characterized in that, The top of the tank body (1) is fixedly connected to two flange cylinders (2). The top of each flange cylinder (2) is bolted and sealed with an installation flange (3). The top of each installation flange (3) is fixedly connected to a radar level gauge (4) and a thermometer (5). The top of the flange cylinder (2) is rotatably connected to four rotating rods (6). The four rotating rods (6) are rotatably sealed inside the flange cylinder (2). The top of each rotating rod (6) is fixedly connected to a knob (7). The top of the flange cylinder (2) is fixedly connected to a limit ring (8) relative to the outside of the knob (7). The limit ring (8) is provided with a limit mechanism for limiting the reverse rotation of the knob (7). The flange cylinder (2) has a rotating groove (9) at its bottom end. A pair of meshing gears (10) are rotatably connected inside the rotating groove (9). The bottom end of one of the rotating rods (6) is fixedly connected to the center of the top of one of the gears (10). The top of the other gear (10) is fixedly connected to a branch rod (11). The bottom ends of the branch rod (11) and the rotating rod (6) are both provided with rectangular grooves (12). A rectangular rod (13) is longitudinally slidably connected inside the rectangular groove (12). The bottom ends of the rectangular rod (13) are all fixedly connected with mounting blocks (14). The bottom ends of the mounting blocks (14) located below the two gears (10) are all fixedly connected with semicircular blocks (15). An upper spring (22) is fixedly connected between the top of the rectangular rod (13) and the top of the rectangular groove (12). A straight groove (18) is provided on the side of the semicircular block (15) that is close to each other.

2. The complete set of safety monitoring equipment for flammable liquid tank farms according to claim 1, characterized in that, The top of the mounting flange (3) is fixedly connected to a pair of air exchange joints (16) with ball valves, and the top of the mounting flange (3) is provided with grooves (17) at the position above the knob (7).

3. The complete set of safety monitoring equipment for flammable liquid tank farms according to claim 1, characterized in that, The inner wall of the straight groove (18) and the top of the semi-circular block (15) are both fixedly connected with an air expansion sealing ring (19), and the top of the mounting flange (3) is fixedly connected with an air expansion joint (20). The air expansion joint (20) and the air expansion sealing ring (19) are fixedly connected by an air pipe (21).

4. A complete set of safety monitoring devices for flammable liquid storage tanks in a tank farm according to claim 1, characterized in that, The limiting mechanism includes a pawl (23), and a U-shaped groove (24) is provided inside the knob (7). The pawl (23) is laterally slidably connected to the lateral end of the bottom of the U-shaped groove (24). A limiting spring (25) is fixedly connected between the side wall of the pawl (23) and the inner wall of the U-shaped groove (24). A number of limiting grooves (26) with inclined surfaces are equidistantly provided on the inner wall of the limiting ring (8). The pawl (23) is inserted into the inner side of one of the limiting grooves (26). An L-shaped rod (27) is fixedly connected to the top of the pawl (23). The L-shaped rod (27) is laterally slidably connected to the top of the U-shaped groove (24).

5. A complete set of safety monitoring devices for flammable liquid storage tanks in a tank farm according to claim 1, characterized in that, A rotating frame (28) is rotatably connected to the outer wall of one of the mounting blocks (14) on the side away from the rotating groove (9). One end of the rotating frame (28) is inserted into the inside of the straight groove (18). The rotating frame (28) completely blocks the straight groove (18). Sealing strips (29) are fixedly connected to both sides of the top of the rotating frame (28). The outer walls of the other two mounting blocks (14) located between the rotating frame (28) and the gear (10) are fixedly connected with fixing rings (30). The upper rod (31) and the lower rod (32) are fixedly connected to the upper and lower sides of the outer wall of the fixing ring (30), respectively. A circular groove (33) is opened at the bottom of the flange cylinder (2) relative to the position above the fixing ring (30). The fixing ring (30) is inserted into the inner side of the circular groove (33). The semicircular block (15) is provided with a slot (46) for the insertion of the lower rod (32) on the opposite side. A slanted groove (47) is opened at the top of the slot (46).

6. A complete set of safety monitoring devices for flammable liquid storage tanks in a tank farm according to claim 5, characterized in that, The circular groove (33) is provided with an extrusion groove (34), which is arranged in a spiral shape and its extension arc is a quarter of a circle. The bottom end of the extrusion groove (34) is provided with a horizontal annular groove (35) connected to it. The horizontal annular groove (35) extends in the horizontal direction and surrounds a circle with an arc of half a circle. The upper rod (31) is inserted into the inner side of the extrusion groove (34).

7. A complete set of safety monitoring devices for flammable liquid storage tanks in a tank farm according to claim 5, characterized in that, The top of the rotating frame (28) is fixedly connected to a positioning rod (36), and the bottom of the flange cylinder (2) is provided with a half-circular positioning groove (37) relative to the position above the rotating frame (28). The positioning rod (36) is inserted into the inside of the positioning groove (37), and the rotating frame (28) is rotatably connected to the bottom of the flange cylinder (2).

8. A complete set of safety monitoring devices for flammable liquid storage tanks in a tank farm according to claim 5, characterized in that, A storage groove (38) is provided on the side of the rotating frame (28) away from the semicircular block (15). A rubber block (39) is slidably connected to the inner side of the storage groove (38). A round rod (40) is fixedly connected to the side wall of the rubber block (39). The side wall of the round rod (40) passes through the inner side of the rotating frame (28). A lower spring (41) is fixedly connected between the side wall of the rubber block (39) and the inner wall of the storage groove (38). The side end of the round rod (40) is set as a smooth arc surface. A pair of fixed springs are fixedly connected to the inner side of the rotating frame (28). A push plate (43) is fixedly connected to the outer wall of the mounting block (14) located in the rotating frame (28). The push plate (43) is arranged between the fixed plates (42) and the push plate (43) is in contact with the side wall of one of the fixed plates (42). A push spring (44) is fixedly connected between the side wall of the push plate (43) and the side wall of the other fixed plate (42). A pressing block (45) is fixedly connected to the outer wall of the mounting block (14) located in the rotating frame (28). The side wall of the pressing block (45) is inclined.

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