Safety warning device for unloading liquefied natural gas

Abstract

The invention provides a liquid unloading safety warning device for liquefied natural gas, and relates to the technical field of safety warning devices, the liquid unloading safety warning device comprises a first mounting sleeve and a second mounting sleeve, the first mounting sleeve detachably sleeves a conveying pipe, and the second mounting sleeve detachably sleeves another conveying pipe. According to the liquid unloading safety warning device for the liquefied natural gas, through the arrangement of a first mounting sleeve, a second mounting sleeve, a first protection barrel, a second protection barrel, a splicing sealing structure, a pressure relief pipe, a telescopic container, a plugging mechanism and a transmission mechanism, when leakage occurs at the splicing position of a liquefied natural gas conveying pipe, the liquid unloading safety warning device can unload the liquefied natural gas; the leakage condition of liquefied natural gas can be judged according to the lifting height of the telescopic container, workers can conveniently judge the leakage condition for handling, leaked liquefied natural gas can be collected, safety accidents are reduced, when the leakage amount is too large, the conveying pipe can be blocked, the workers can conveniently handle, and the working efficiency is improved. And accidents are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of safety warning devices, and in particular to a safety warning device for liquefied natural gas unloading. Background Art

[0002] In the energy field, liquefied natural gas (LNG) is increasingly used due to its high efficiency and cleanliness. However, the joints of LNG transmission pipelines are prone to leakage, and safety issues are of vital importance. Once leakage occurs, it may cause serious safety accidents, resulting in huge casualties and property losses. Therefore, LNG leakage safety warnings can play a key warning role and reduce safety accidents caused by improper operations.

[0003] Existing safety warning devices usually use sensors to detect the natural gas content in the air. However, in the case of small leaks, the sensors may not be able to detect liquefied natural gas leaks. In addition, existing safety warning devices usually use simple flashing lights to fail to fully and promptly respond to specific leaks. In actual conditions, the temperature of liquefied natural gas is usually around -162°C. Under such low temperatures, traditional light warning devices may experience problems such as reduced brightness, abnormal flashing frequency, and even failure due to frozen circuits, making it difficult to attract attention. When liquefied natural gas leaks, the surrounding air may also condense due to cold, which may form frost on the surface of the warning device, directly blocking the light and causing the signal to completely fail. Summary of the Invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a safety warning device for liquefied natural gas unloading.

[0005] The present invention proposes a safety warning device for liquefied natural gas unloading, comprising a No. 1 installation sleeve and a No. 2 installation sleeve, wherein the No. 1 installation sleeve is detachably mounted on a delivery pipe, and the No. 2 installation sleeve is detachably mounted on another delivery pipe, one end of the No. 1 installation sleeve is fixedly connected to a No. 1 protective sleeve, and one end of the No. 2 installation sleeve is fixedly connected to a No. 2 protective sleeve, a splicing sealing structure is provided between the No. 1 protective sleeve and the No. 2 protective sleeve, and the splicing sealing structure is used to secure the firmness and sealing of the splicing portion of the ends of the No. 1 protective sleeve and the No. 2 protective sleeve, and the No. 1 protective sleeve and the No. 2 protective sleeve can cover the splicing portion of the two delivery pipes; A closed space is formed between the No. 1 installation sleeve, the No. 2 installation sleeve, the No. 1 protective sleeve, the No. 2 protective sleeve, and the outer wall of the delivery pipe. A pressure relief pipe connected to the closed space is installed on the No. 1 protective sleeve. A telescopic container connected to the pressure relief pipe is detachably installed on the No. 1 protective sleeve. When a leak occurs at the connection between the two delivery pipes, liquefied natural gas enters the telescopic container, causing the telescopic container to rise. A blocking mechanism is installed on the No. 2 protective cylinder, which can block the two conveying pipes. A transmission mechanism is provided between the blocking mechanism and the telescopic container. When the telescopic container is raised, the transmission mechanism converts the raising action of the telescopic container into the closing action of the blocking mechanism.

[0006] Preferably, the splicing sealing structure includes a splicing rod, a No. 1 trapezoidal block, a No. 2 trapezoidal block and a tightening assembly; the number of the splicing rods is multiple, and the multiple splicing rods are arranged in a circular array at the end of the No. 2 protective tube away from the No. 2 mounting sleeve, and the end of the No. 1 protective tube away from the No. 1 mounting sleeve is provided with a plug-in groove adapted to the splicing rod, the No. 1 trapezoidal block is fixedly connected to the end of the splicing rod away from the No. 2 protective tube, and the No. 2 trapezoidal block is slidably installed in the plug-in groove, and the inclined surface of the No. 2 trapezoidal block is slidably matched with the inclined surface of the No. 1 trapezoidal block; The tightening assembly is used to drive the second trapezoidal block to slide in the insertion slot.

[0007] Preferably, the tightening assembly includes a sealing slide, a semi-threaded column and a locking nut; the outer periphery of the No. 1 protective cylinder is fixedly connected to an external connecting cylinder, the inner wall of the No. 1 protective cylinder is provided with a movable sliding groove connected to the plug-in groove, the sealing slide is slidably installed in the movable sliding groove, and the sealing slide can block the plug-in groove, and the No. 2 trapezoidal block is fixedly connected to the sealing slide; One end of the semi-threaded column is fixedly connected to the sealing slide, and the other end of the semi-threaded column passes through the No. 1 protective tube and the external tube in sequence, and the locking nut is threadedly sleeved on the semi-threaded column.

[0008] Preferably, the telescopic container includes a fixed cylinder and a lifting cylinder; the pressure relief tube is installed in one of the semi-threaded columns, and the openings at both ends of the pressure relief tube are respectively located at the two ends of the semi-threaded column. The fixed cylinder is detachably mounted on the corresponding external cylinder, the fixed cylinder is connected to one end of the pressure relief tube, and the lifting cylinder is slidably mounted on the fixed cylinder.

[0009] Preferably, the telescopic container also includes a No. 1 limit rod, a sealing plug and a No. 1 spring; a No. 1 bracket is installed in the fixed cylinder, the No. 1 limit rod slides through the No. 1 bracket, the sealing plug is fixedly connected to one end of the No. 1 limit rod, and the sealing plug can block the opening connecting the fixed cylinder and the pressure relief pipe, the No. 1 spring is mounted on the No. 1 limit rod, and the two ends of the No. 1 spring respectively abut against the No. 1 bracket and the sealing plug.

[0010] Preferably, a No. 2 bracket is installed in the pressure relief pipe, the No. 2 limit rod slides through the No. 2 bracket, one end of the No. 2 limit rod is fixedly connected to a conical plug, and an annular block is fixedly installed on the inner wall of the pressure relief pipe. The conical plug can lean against the annular block and seal the pressure relief pipe, and a No. 2 spring is mounted on the No. 2 limit rod, and the two ends of the No. 2 spring respectively lean against the conical plug and the No. 2 bracket.

[0011] Preferably, the sealing mechanism includes a docking tube and a sealing valve plate; the docking tube is fixedly connected in the No. 2 protective cylinder, and the axis of the No. 2 protective cylinder coincides with the axis of the docking tube, the two delivery pipes are respectively mounted on the two ends of the docking tube, the number of the sealing valve plates is two, and the two sealing valve plates are respectively rotatably installed at the two ends of the docking tube, and the two sealing valve plates can respectively seal the openings at both ends of the docking tube.

[0012] Preferably, the blocking mechanism further comprises a sealing strip; the number of the sealing strips is two, and the two sealing strips are respectively installed at both ends of the butt joint pipe, the inner ring surface of the sealing strip is a conical surface, and the outer periphery of one side of the blocking valve plate is a conical surface; When the blocking valve plate abuts against the end face of the butt pipe, the outer peripheral conical surface of the blocking valve plate and the inner ring conical surface of the sealing strip are slidably matched.

[0013] Preferably, the transmission mechanism includes a T-rod, a connecting rod and a slide; the vertical section of the T-rod slides through the docking tube and the No. 2 protective cylinder, the two ends of the connecting rod are fixedly connected to the top of the T-rod and the top surface of the lifting cylinder respectively, the slide is slidably installed on the side of the sealing valve plate, and the lateral end of the T-rod is rotatably connected to the slide.

[0014] Preferably, a sealing ring is further included; the inner walls of the No. 1 mounting sleeve and the No. 2 mounting sleeve are both provided with sealing grooves, locking belts are installed in the sealing grooves, and the sealing ring is fastened to the outer periphery of the locking belt.

[0015] The present invention provides a safety warning device for liquefied natural gas unloading, which has the following beneficial effects: by arranging a No. 1 installation sleeve, a No. 2 installation sleeve, a No. 1 protective cylinder, a No. 2 protective cylinder, a spliced ​​sealing structure, a pressure relief pipe, a telescopic container, a blocking mechanism and a transmission mechanism, when leakage occurs at the splicing point of the liquefied natural gas transmission pipe, the leakage of the liquefied natural gas can be judged by the rising height of the telescopic container, which is convenient for staff to judge the leakage and deal with it. The leaked liquefied natural gas can also be collected to reduce safety accidents. When the leakage amount is too large, the inside of the transmission pipe can be blocked, which is convenient for staff to deal with and reduce accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a schematic diagram of the overall structure of a safety warning device for liquefied natural gas unloading proposed by the present invention; Figure 2 This is a cross-sectional view of a safety warning device for liquefied natural gas unloading proposed by the present invention; Figure 3 This is a structural schematic diagram of a splicing rod and a No. 1 trapezoidal block in a liquefied natural gas unloading safety warning device proposed by the present invention; Figure 4 A safety warning device for liquefied natural gas unloading proposed by the present invention Figure 2 Enlarged view of point A in the middle; Figure 5 A safety warning device for liquefied natural gas unloading proposed by the present invention Figure 2 Enlarged view of point B in the middle; Figure 6 This is a schematic end view of a butt joint pipe and a sealing strip in a liquefied natural gas unloading safety warning device proposed by the present invention; Figure 7 This is a schematic structural diagram of a sealing strip used in a liquefied natural gas unloading safety warning device proposed by the present invention; Figure 8 This is a structural schematic diagram of a blocking valve plate and a sliding seat in a liquefied natural gas unloading safety warning device proposed by the present invention; Figure 9 This is a structural schematic diagram of a T-bar used in a liquefied natural gas unloading safety warning device proposed by the present invention.

[0017] In the figure: 1. Mounting sleeve No. 1; 2. Mounting sleeve No. 2; 3. Protective cylinder No. 1; 4. Protective cylinder No. 2; 5. Pressure relief pipe; 6. Splicing rod; 7. Trapezoidal block No. 1; 8. Trapezoidal block No. 2; 9. Sealing slide plate; 10. Semi-threaded column; 11. Locking nut; 12. External cylinder; 13. Fixed cylinder; 14. Lifting cylinder; 15. Limiting rod No. 1; 16. Sealing plug; 17. No. 1 spring; 18. Limiting rod No. 2; 19. Conical plug; 20. No. 2 spring; 21. Butt joint pipe; 22. Sealing valve plate; 23. Sealing strip; 24. T-rod; 25. Connecting rod; 26. Sliding seat; 27. Sealing ring; 28. Locking belt. DETAILED DESCRIPTION

[0018] Reference Figures 1-9The present invention proposes a safety warning device for liquefied natural gas unloading, comprising a No. 1 installation sleeve 1 and a No. 2 installation sleeve 2. The No. 1 installation sleeve 1 can be detachably sleeved on a delivery pipe, and the No. 2 installation sleeve 2 can be detachably sleeved on another delivery pipe. One end of the No. 1 installation sleeve 1 is fixedly connected to a No. 1 protective sleeve 3, and one end of the No. 2 installation sleeve 2 is fixedly connected to a No. 2 protective sleeve 4. A splicing sealing structure is provided between the No. 1 protective sleeve 3 and the No. 2 protective sleeve 4. The inner diameters of the No. 1 protective sleeve 3 and the No. 2 protective sleeve 4 are the same, and the inner diameters of the two are larger than the outer diameter of the delivery pipe. A sealing ring 27 is also included. The material of the sealing ring 27 is a combination of polytetrafluoroethylene and a filling modified material. The inner walls of the No. 1 installation sleeve 1 and the No. 2 installation sleeve 2 are both provided with a sealing groove, and a sealing ring is installed in the sealing groove. There is a locking belt 28, which is a corrugated steel belt. The sealing ring 27 is tied to the outer periphery of the locking belt 28. The splicing sealing structure is used to fix the firmness and sealing of the splicing of the ends of the No. 1 protective tube 3 and the No. 2 protective tube 4. A sealing device, such as a sealing ring, is provided between the No. 1 protective tube 3 and the No. 2 protective tube 4. The No. 1 protective tube 3 and the No. 2 protective tube 4 can cover the connection between the two conveying pipes. A closed space is formed between the No. 1 mounting sleeve 1, the No. 2 mounting sleeve 2, the No. 1 protective tube 3, the No. 2 protective tube 4 and the outer wall of the conveying pipe. A pressure relief pipe 5 connected to the closed space is installed on the No. 1 protective tube 3. A telescopic container connected to the pressure relief pipe 5 is detachably installed on the No. 1 protective tube 3. A warning scale is provided on the telescopic container. When the connection between the two conveying pipes When leakage occurs, liquefied natural gas enters the telescopic container, causing the telescopic container to rise, and a sealing mechanism is installed on the No. 2 protective cylinder 4, which can seal the two delivery pipes. A transmission mechanism is provided between the sealing mechanism and the telescopic container. When the telescopic container rises, the transmission mechanism converts the lifting action of the telescopic container into the closing action of the sealing mechanism. In actual practice, at the joints of the ends of the two delivery pipes, the No. 1 mounting sleeve 1 and the No. 2 mounting sleeve 2 are respectively mounted on the two delivery pipes, and then the sealing between the two mounting sleeves and the delivery pipes is ensured by the locking belt 28 and the sealing ring 27, and the firmness and sealing of the splicing between the No. 1 protective cylinder 3 and the No. 2 protective cylinder 4 are ensured by the splicing sealing structure, so that the delivery pipe and the No. 1 protective cylinder 3 and the No. 2 protective cylinder are sealed. A relatively closed space is formed between the protective cylinders 4. When a leak occurs at the joint of the two delivery pipes, the leaked liquefied natural gas leaks into the closed space. The liquefied natural gas leaked into the closed space enters the telescopic container through the pressure relief pipe 5, and the telescopic container rises. As the telescopic container rises, when the alarm fails due to low temperature or other factors, the raised telescopic container can facilitate the staff to clearly observe the leakage of liquefied natural gas, which can facilitate the staff to deal with it in time. When the leakage reaches a certain flow rate, if the liquefied natural gas leaks out, it may cause a safety accident. Therefore, when the telescopic container is raised to a specified height, the transmission mechanism drives the blocking mechanism to block the two delivery pipes (when the leakage is small,Prompt staff to handle the situation in a timely manner to ensure the normal delivery of liquefied natural gas), and reduce the occurrence of safety accidents caused by liquefied natural gas leakage (in actual situations, when the delivery pipe is blocked, the pressure in the delivery pipe will be detected, and the delivery pump will be shut down to reduce the excessive pressure in the delivery pipe).

[0019] like Figure 2 、 Figure 3 and Figure 4 As shown in, the splicing sealing structure includes a splicing rod 6, a No. 1 trapezoidal block 7, a No. 2 trapezoidal block 8 and a tightening assembly; the number of splicing rods 6 is multiple, and the multiple splicing rods 6 are arranged in a circular array at the end of the No. 2 protective tube 4 away from the No. 2 mounting sleeve 2, and the end of the No. 1 protective tube 3 away from the No. 1 mounting sleeve 1 is provided with a plug-in groove adapted to the splicing rod 6, the No. 1 trapezoidal block 7 is fixedly connected to the end of the splicing rod 6 away from the No. 2 protective tube 4, the No. 2 trapezoidal block 8 is slidably installed in the plug-in groove, the inclined surface of the No. 2 trapezoidal block 8 slides with the inclined surface of the No. 1 trapezoidal block 7, and the tightening assembly is used to drive the two The No. 1 trapezoidal block 8 slides in the plug-in slot. When the No. 1 protective tube 3 and the No. 2 protective tube 4 are spliced ​​together, the ends of the two abut against each other, and the splicing rod 6 is inserted into the plug-in slot at the end of the No. 1 protective tube 3. Then, the No. 2 trapezoidal block 8 is driven to slide in the plug-in slot through the tightening component, so that the inclined surface of the No. 2 trapezoidal block 8 and the inclined surface of the No. 1 trapezoidal block 7 slide and cooperate, thereby driving the No. 1 trapezoidal block 7 to slide horizontally in the plug-in slot. The sliding No. 1 trapezoidal block 7 tightens the splicing rod 6, and the splicing rod 6 pulls the No. 2 protective tube 4 to press against the end of the No. 1 protective tube 3, thereby completing the firmness and sealing of the splicing.

[0020] like Figure 2 and Figure 4As shown in, the tightening assembly includes a sealing slide 9, a semi-threaded column 10 and a locking nut 11; the outer periphery of the No. 1 protective tube 3 is fixedly connected to the external tube 12, and the inner wall of the No. 1 protective tube 3 is provided with a movable slide groove connected to the plug-in groove, the sealing slide 9 is slidably installed in the movable slide groove, and the sealing slide 9 can block the plug-in groove, the No. 2 trapezoidal block 8 is fixedly connected to the sealing slide 9, one end of the semi-threaded column 10 is fixedly connected to the sealing slide 9, and the other end of the semi-threaded column 10 passes through the No. 1 protective tube 3 and the external tube 12 in sequence, and the locking nut 11 is threadedly mounted on the semi-threaded column 10. When the No. 1 protective tube 3 and the No. 2 protective tube 4 are spliced ​​together, the locking nut 11 can be tightened and pulled by the semi-threaded column 10 The sealing slide 9 drives the No. 2 trapezoidal block 8 to slide synchronously, thereby driving the No. 1 trapezoidal block 7 to slide, completing the splicing between the No. 1 protective tube 3 and the No. 2 protective tube 4. In addition, when a leak occurs at the connection between the two conveying pipes, the air pressure in the sealed space between the No. 1 protective tube 3 and the No. 2 protective tube 4 increases, and the air pressure drives multiple sealing slides 9 to slide in the movable slide groove, driving the No. 2 trapezoidal block 8 to slide synchronously, thereby driving the No. 1 trapezoidal block 7 to slide and pull the splicing rod 6 and the No. 2 protective tube 4, thereby making the splicing between the No. 1 protective tube 3 and the No. 2 protective tube 4 more secure, reducing the leakage of liquefied natural gas to the outside, and the leaked liquefied natural gas then enters the telescopic container through the pressure relief pipe 5.

[0021] like Figure 1 、 Figure 2 and Figure 3 As shown in, the telescopic container includes a fixed cylinder 13 and a lifting cylinder 14; a leakage scale is set on the outer periphery of the fixed cylinder 13, the pressure relief pipe 5 is installed in one of the semi-threaded columns 10, and the openings at both ends of the pressure relief pipe 5 are respectively located at the two ends of the semi-threaded column 10, and the fixed cylinder 13 is detachably sleeved on the corresponding external cylinder 12. The fixed cylinder 13 is detachably mounted on the external cylinder 12 through existing structures such as buckles and lock pins. The fixed cylinder 13 is connected with one end of the pressure relief pipe 5, and liquefied natural gas directly enters the fixed cylinder 13 through the pressure relief pipe 5 and will not leak to the splicing position between the fixed cylinder 13 and the external cylinder 12. The lifting cylinder 14 is slidably sleeved on the fixed cylinder 13. When liquefied natural gas leaks into the fixed cylinder 13, the air pressure in the fixed cylinder 13 increases, driving the lifting cylinder 14 to rise. According to the height to which the lifting cylinder 14 is raised, the leakage amount of the liquefied natural gas can be judged.

[0022] like Figure 4As shown in, the telescopic container also includes a No. 1 limit rod 15, a sealing plug 16 and a No. 1 spring 17; a No. 1 bracket is installed in the fixed cylinder 13, the No. 1 limit rod 15 slides through the No. 1 bracket, and the sealing plug 16 is fixedly connected to one end of the No. 1 limit rod 15, and the sealing plug 16 can block the opening of the fixed cylinder 13 connected to the pressure relief pipe 5. The No. 1 limit rod 15 limits the movement trajectory of the sealing plug 16 to ensure that the sealing plug 16 can accurately block the end opening of the fixed cylinder 13, and the No. 1 spring 17 is mounted on the No. 1 limit rod 15, and the two ends of the No. 1 spring 17 respectively abut against the No. 1 bracket and the sealing plug 16. During processing, the fixed cylinder 13 is disassembled and loosened, and the fixed cylinder 13 is gradually removed. Under the rebound action of the No. 1 spring 17, the sealing plug 16 blocks the end opening of the fixed cylinder 13, reducing the leakage of liquefied natural gas therein to the outside world and reducing safety hazards.

[0023] like Figure 4 As shown in , a No. 2 bracket is installed in the pressure relief pipe 5, and a No. 2 limiting rod 18 slides through the No. 2 bracket. One end of the No. 2 limiting rod 18 is fixedly connected to a tapered plug 19. The No. 2 limiting rod 18 is used to limit the movement trajectory of the tapered plug 19. An annular block is fixedly installed on the inner wall of the pressure relief pipe 5. The annular block has a cylindrical section. The end of the tapered plug 19 is also connected to a cylinder. The diameter of the cylinder is the same as the inner diameter of the cylindrical section. The cylinder can be inserted into the cylindrical section and sealed. The tapered plug 19 can rest on the annular block and seal the pressure relief pipe 5. A No. 2 spring 20 is sleeved on the No. 2 limiting rod 18. The two ends of the No. 2 spring 20 respectively rest on the conical plug 19 and the No. 2 bracket. When the air pressure in the closed space increases, it will gradually exert a force on the conical plug 19. At the same time, it is necessary to overcome the rebound force of the No. 2 spring 20. It is necessary to ensure that the air pressure reaches the set value. When the conical plug 19 slides, it will drive the No. 2 limit rod 18 to move synchronously. The end of the No. 2 limit rod 18 will also rest on the sealing plug 16, and then overcome the rebound force of the No. 1 spring 17, thereby realizing the discharge of the leaked liquefied natural gas into the telescopic container, which is convenient for the collection and treatment of the leaked liquefied natural gas.

[0024] like Figure 2 and Figure 5 As shown in the figure, the sealing mechanism includes a docking tube 21 and a sealing valve plate 22; the docking tube 21 is fixedly connected to the No. 2 protective tube 4, and the axis of the No. 2 protective tube 4 coincides with the axis of the docking tube 21, and the two delivery pipes are respectively mounted on both ends of the docking tube 21, and a sealing treatment such as a sealing ring is provided between the delivery pipe and the docking tube 21. There are two sealing valve plates 22, and the two sealing valve plates 22 are rotatably installed at both ends of the docking tube 21. The two sealing valve plates 22 can respectively block the openings at both ends of the docking tube 21. When the leakage of liquefied natural gas is too much, the two sealing valve plates 22 will be driven to rotate and abut against the two ends of the docking tube 21, reducing the leakage of liquefied natural gas, thereby reducing the occurrence of safety accidents.

[0025] like Figure 2 、 Figure 5 and Figure 7 As shown in, the sealing mechanism also includes a sealing strip 23; there are two sealing strips 23, and the material of the sealing strips 23 is titanium alloy. The two sealing strips 23 are respectively installed at the two ends of the butt joint 21, and the inner ring surface of the sealing strip 23 is a conical surface, and the outer periphery of one side of the sealing valve plate 22 is a conical surface. When the sealing valve plate 22 is against the end face of the butt joint 21, the outer peripheral conical surface of the sealing valve plate 22 slides with the inner ring conical surface of the sealing strip 23. In the specific operation process, when the sealing valve plate 22 is against the two ends of the butt joint 21, the outer peripheral conical surface of the sealing valve plate 22 and the inner ring conical surface of the sealing strip 23 slide and cooperate, giving the sealing strip 23 a diffusion effect to the surroundings, so that the sealing strip 23 is pressed against the inner wall of the delivery pipe, and the two delivery pipes are sealed by the coordinated use of the sealing valve plate 22 and the sealing strip 23, thereby reducing the leakage of liquefied natural gas.

[0026] like Figure 2 、 Figure 5 、 Figure 8 and Figure 9 As shown in the figure, the transmission mechanism includes a T-rod 24, a connecting rod 25 and a slide 26; the vertical section of the T-rod 24 slides through the butt joint 21 and the No. 2 protective tube 4, and the two ends of the connecting rod 25 are fixedly connected to the top of the T-rod 24 and the top surface of the lifting cylinder 14 respectively. The slide 26 is slidably installed on the side of the blocking valve plate 22, and the lateral end of the T-rod 24 is rotatably connected to the slide 26. When the lifting cylinder 14 is raised, the lifting cylinder 14 will drive the connecting rod 25 and the T-rod 24 to rise synchronously. When the T-rod 24 is raised, it will drive the slide 26 to rise, drive the slide 26 to slide on the blocking valve plate 22, and drive the blocking valve plate 22 to rotate synchronously until the blocking valve plate 22 rotates and rests against the two ends of the butt joint 21 to complete the blocking.

[0027] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A safety warning device for liquefied natural gas unloading, characterized in that: It comprises a No. 1 mounting sleeve (1) and a No. 2 mounting sleeve (2), wherein the No. 1 mounting sleeve (1) is detachably mounted on a delivery pipe, and the No. 2 mounting sleeve (2) is detachably mounted on another delivery pipe, one end of the No. 1 mounting sleeve (1) is fixedly connected to a No. 1 protective sleeve (3), and one end of the No. 2 mounting sleeve (2) is fixedly connected to a No. 2 protective sleeve (4), and a splicing sealing structure is provided between the No. 1 protective sleeve (3) and the No. 2 protective sleeve (4), and the splicing sealing structure is used to fix the firmness and sealing of the splicing portion of the end portions of the No. 1 protective sleeve (3) and the No. 2 protective sleeve (4), and the No. 1 protective sleeve (3) and the No. 2 protective sleeve (4) can cover the splicing portion of the two delivery pipes; A closed space is formed between the No. 1 installation sleeve (1), the No. 2 installation sleeve (2), the No. 1 protective sleeve (3), the No. 2 protective sleeve (4) and the outer wall of the delivery pipe. A pressure relief pipe (5) communicating with the closed space is installed on the No. 1 protective sleeve (3). A telescopic container communicating with the pressure relief pipe (5) is detachably installed on the No. 1 protective sleeve (3). When a leak occurs at the connection between the two delivery pipes, liquefied natural gas enters the telescopic container, causing the telescopic container to rise. The second protective cylinder (4) is provided with a blocking mechanism capable of blocking two conveying pipes. A transmission mechanism is provided between the blocking mechanism and the telescopic container. When the telescopic container is raised, the transmission mechanism converts the raising action of the telescopic container into the closing action of the blocking mechanism.

2. A safety warning device for liquefied natural gas unloading according to claim 1, characterized in that: The splicing sealing structure comprises a splicing rod (6), a No. 1 trapezoidal block (7), a No. 2 trapezoidal block (8) and a tightening assembly; the number of the splicing rods (6) is multiple, and the multiple splicing rods (6) are arranged in a circular array at one end of the No. 2 protective tube (4) away from the No. 2 mounting sleeve (2); the end of the No. 1 protective tube (3) away from the No. 1 mounting sleeve (1) is provided with a plug-in slot adapted to the splicing rod (6); the No. 1 trapezoidal block (7) is fixedly connected to the end of the splicing rod (6) away from the No. 2 protective tube (4); the No. 2 trapezoidal block (8) is slidably mounted in the plug-in slot; the inclined surface of the No. 2 trapezoidal block (8) is slidably matched with the inclined surface of the No. 1 trapezoidal block (7); The tightening assembly is used to drive the second trapezoidal block (8) to slide in the insertion slot.

3. A safety warning device for liquefied natural gas unloading according to claim 2, characterized in that: The tightening assembly includes a sealing slide (9), a semi-threaded column (10) and a locking nut (11); the outer periphery of the No. 1 protective tube (3) is fixedly connected to an external tube (12); the inner wall of the No. 1 protective tube (3) is provided with a movable slide groove connected to the plug-in groove; the sealing slide (9) is slidably installed in the movable slide groove, and the sealing slide (9) can block the plug-in groove; the No. 2 trapezoidal block (8) is fixedly connected to the sealing slide (9); One end of the semi-threaded column (10) is fixedly connected to the sealing slide plate (9), and the other end of the semi-threaded column (10) passes through the No. 1 protective tube (3) and the external tube (12) in sequence, and the locking nut (11) is threadedly mounted on the semi-threaded column (10).

4. A safety warning device for liquefied natural gas unloading according to claim 3, characterized in that: The telescopic container comprises a fixed cylinder (13) and a lifting cylinder (14); the pressure relief pipe (5) is installed in one of the semi-threaded columns (10), and the openings at both ends of the pressure relief pipe (5) are respectively located at the two ends of the semi-threaded column (10); the fixed cylinder (13) is detachably sleeved on the corresponding external cylinder (12); the fixed cylinder (13) is communicated with one end of the pressure relief pipe (5), and the lifting cylinder (14) is slidably sleeved on the fixed cylinder (13).

5. A safety warning device for liquefied natural gas unloading according to claim 4, characterized in that: The telescopic container further comprises a No. 1 limiting rod (15), a sealing plug (16) and a No. 1 spring (17); a No. 1 bracket is installed in the fixed cylinder (13), the No. 1 limiting rod (15) slides through the No. 1 bracket, the sealing plug (16) is fixedly connected to one end of the No. 1 limiting rod (15), and the sealing plug (16) can seal the opening connecting the fixed cylinder (13) and the pressure relief pipe (5); the No. 1 spring (17) is sleeved on the No. 1 limiting rod (15), and the two ends of the No. 1 spring (17) respectively abut against the No. 1 bracket and the sealing plug (16).

6. A safety warning device for liquefied natural gas unloading according to claim 5, characterized in that: A No. 2 bracket is installed in the pressure relief pipe (5), and the No. 2 limiting rod (18) slides through the No. 2 bracket. One end of the No. 2 limiting rod (18) is fixedly connected to a conical plug (19). An annular block is fixedly installed on the inner wall of the pressure relief pipe (5). The conical plug (19) can lean against the annular block and seal the pressure relief pipe (5). A No. 2 spring (20) is mounted on the No. 2 limiting rod (18), and both ends of the No. 2 spring (20) lean against the conical plug (19) and the No. 2 bracket respectively.

7. A safety warning device for liquefied natural gas unloading according to claim 4, characterized in that: The blocking mechanism includes a butt joint pipe (21) and a blocking valve plate (22); the butt joint pipe (21) is fixedly connected to the second protective cylinder (4), and the axis of the second protective cylinder (4) coincides with the axis of the butt joint pipe (21); the two delivery pipes are respectively sleeved on both ends of the butt joint pipe (21); the number of the blocking valve plates (22) is two, and the two blocking valve plates (22) are respectively rotatably mounted on the two ends of the butt joint pipe (21); the two blocking valve plates (22) can respectively block the openings at both ends of the butt joint pipe (21).

8. A safety warning device for liquefied natural gas unloading according to claim 7, characterized in that: The blocking mechanism further includes a sealing strip (23); the number of the sealing strips (23) is two, and the two sealing strips (23) are respectively installed at both ends of the butt tube (21); the inner ring surface of the sealing strip (23) is a conical surface, and the outer periphery of one side of the blocking valve plate (22) is a conical surface; When the blocking valve plate (22) abuts against the end face of the butting pipe (21), the outer peripheral conical surface of the blocking valve plate (22) and the inner conical surface of the sealing strip (23) are in sliding engagement.

9. A safety warning device for liquefied natural gas unloading according to claim 9, characterized in that: The transmission mechanism includes a T-shaped rod (24), a connecting rod (25) and a slide (26); the vertical section of the T-shaped rod (24) slides through the butt joint (21) and the second protective tube (4); the two ends of the connecting rod (25) are fixedly connected to the top of the T-shaped rod (24) and the top surface of the lifting tube (14), respectively; the slide (26) is slidably mounted on the side of the sealing valve plate (22); the lateral end of the T-shaped rod (24) is rotatably connected to the slide (26).

10. The safety warning device for liquefied natural gas unloading according to claim 1, characterized in that: It also includes a sealing ring (27); the inner walls of the No. 1 mounting sleeve (1) and the No. 2 mounting sleeve (2) are both provided with a sealing groove, a locking belt (28) is installed in the sealing groove, and the sealing ring (27) is fastened to the outer periphery of the locking belt (28).

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