Self-adaptive online repairing and purging device for cold insulation structure of LNG (Liquefied Natural Gas) pipeline

Abstract

The invention relates to the technical field of LNG pipelines, and discloses an LNG pipeline cold insulation structure self-adaptive online repair purging device which comprises a gas inlet mechanism, purging mechanisms are installed on the inner side of the gas inlet mechanism at equal intervals, and self-adaptive supporting mechanisms are installed on the outer side of the gas inlet mechanism at equal intervals. Each self-adaptive supporting mechanism is connected with the blowing mechanism, the lower end of the air inlet mechanism is in threaded connection with a supporting frame, a driving mechanism is installed at the lower end of the supporting frame, and a guide rail mechanism is arranged at the lower end of the driving mechanism. Through mutual cooperation of the air inlet mechanism, the self-adaptive supporting mechanism and the purging mechanism, effective multiple defrosting purging can be conveniently carried out on the surface of the LNG pipeline, the purging effect is effectively improved, and the online repairing effect of the LNG pipeline cold insulation structure is improved.

Description

Technical Field

[0001] The invention relates to the technical field of LNG pipelines, and in particular to an adaptive online repair and purge device for a cold-insulation structure of an LNG pipeline. Background Art

[0002] Liquefied natural gas, referred to as LNG, is a relatively advanced energy source. Most of the current LNG cold insulation projects use rigid polyurethane foam as the cold insulation structure. After long-term use, the cold insulation structure will crack, shrink and deform. During the online repair of the LNG pipeline, after the old cold insulation material is removed, in the natural state, if no operation is performed, a layer of frost will appear on the exposed pipeline surface within 1 minute, forming a cold bridge between the exposed pipeline and the new cold insulation material, causing cold loss. What's more, too thick frost is not conducive to the installation of new cold insulation materials, resulting in gaps, and the cold insulation effect is worse than before the repair. Therefore, how to control the zero frost on the surface of the LNG pipeline during the entire repair process, especially during the interval between the removal of the old cold insulation material and the installation of the new cold insulation material in the inner layer of the pipeline, is a technical key point in the online repair of the cold insulation structure.

[0003] At present, the commonly used methods at receiving stations mainly use simple rag wiping or pouring or wiping organic solvents such as anhydrous ethanol on the pipeline surface, but there are many disadvantages, such as poor rag wiping effect, ice particles solidified on the pipeline surface cannot be wiped off, and the defrosting effect cannot be achieved, which makes the online repair effect of the LNG pipeline cold insulation structure poor. For this reason, we provide an LNG pipeline cold insulation structure adaptive online repair purge device to solve this problem. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an adaptive online repair and purge device for an LNG pipeline cold insulation structure, which has the advantages of increasing the effect of online repair of the LNG pipeline cold insulation structure.

[0005] To achieve the above object, the present invention provides the following technical solutions: An adaptive online repair and purge device for an LNG pipeline cold-insulation structure comprises an air intake mechanism, a plurality of purge mechanisms are equidistantly installed on the inner side of the air intake mechanism, a plurality of adaptive support mechanisms are equidistantly installed on the outer side of the air intake mechanism, and each of the adaptive support mechanisms is connected to the purge mechanism; The lower end of the air intake mechanism is screwed with a support frame, the lower end of the support frame is installed with a driving mechanism, and the lower end of the driving mechanism is provided with a guide rail mechanism; The purge mechanism includes a bellows telescopic tube installed on the inner side of the air intake mechanism and two groups of side frames, the outer sides of the side frames are provided with slide grooves, the inner cavities of the slide grooves are slidably provided with connecting shafts, the corresponding ends of the connecting shafts are rotatably connected with purge nozzles, the bottom ends of the side frames are rotatably connected with screws, one end of the screws extends to the slide grooves and is threadedly connected to the connecting shafts, the upper end of the purge nozzles is provided with a connector, and the connector is threadedly connected to the bellows telescopic tube.

[0006] Furthermore, the air intake mechanism includes an upper air intake cover and a lower air intake cover, the upper air intake cover and the lower air intake cover are rotatably connected by a hinge, and a plurality of the bellows telescopic tubes are respectively connected and installed with the inner sides of the upper air intake cover and the lower air intake cover; The lower air intake hood is screwed to the support frame, an air intake pipe is installed on the outer side of the lower air intake hood, a square tube is installed on one side of the lower end of the upper air intake hood, a corrugated hose is installed in a sealed inner cavity of the square tube, and the lower end of the corrugated hose is connected and installed with the lower air intake hood; A first magnetic column is installed on one side of the upper end of the lower air inlet cover, a groove corresponding to the position is arranged on one side of the lower end of the upper air inlet cover, and a second magnetic column magnetically attracted to the first magnetic column is installed on the top of the inner cavity of the groove.

[0007] Furthermore, the purge nozzle includes a shell rotatably connected to the connecting shaft, the connecting head is installed at the upper end of the shell, and the lower end of the shell is equidistantly provided with a first exhaust port and a first exhaust hole.

[0008] Furthermore, a deflector is installed at the bottom end of the shell, and notches are symmetrically arranged at the upper end of the deflector.

[0009] Further, the plurality of adaptive support mechanisms each include a fixed column, and the plurality of fixed columns are respectively installed on the outer sides of the upper air intake hood and the lower air intake hood, and the inner cavities of the fixed columns are each provided with a through hole, and the outer sides of the upper air intake hood and the lower air intake hood are each provided with an air hole corresponding to the position thereof; The inner cavity of the fixed column is provided with a square hole connected to the through hole, and one end of the fixed column is installed with an outer tube corresponding to the position of the square hole, and the bottom end of the inner cavity of the outer tube is installed with a first spring, and the upper end of the first spring is installed with a sealing disk, the outer diameter of the sealing disk matches the inner diameter of the outer tube, and the middle part of the sealing disk is installed with an inner tube, and the lower end of the inner tube passes through the outer tube and extends to its lower end and is connected to a support assembly.

[0010] Furthermore, the support assembly includes a round cover connected to the lower end of the inner tube, a group of second exhaust ports and two groups of second exhaust holes are arranged on the outer side of the round cover, a fixed plate is installed on the outer side of the inner tube, one end of the fixed plate is symmetrically connected to a side plate, and rollers are rotatably connected between the side plate and the round cover through a pin shaft.

[0011] Further, a fan assembly is installed at the upper part of the inner cavity of the outer tube, and the fan assembly includes a mounting frame installed on the inner wall of the outer tube, a fan shaft is rotatably connected to the middle of the mounting frame, fan blades are equidistantly installed on the outside of the fan shaft, a fixed shaft is installed at the lower end of the fan shaft, and a fan gear is installed on the outside of the fixed shaft; A rack is meshed on the outer side of the sector gear, one side of the rack is connected to a Z-shaped telescopic rod through a fixed block, one end of the Z-shaped telescopic rod passes through an outer tube and is connected to a shell, an inner wall of the outer tube is provided with a mounting sleeve that is slidably sleeved on the outer side of the Z-shaped telescopic rod, and a second spring is installed between the mounting sleeve and the fixed block.

[0012] Furthermore, the driving mechanism includes a cover plate installed at the lower end of the support frame, the lower end of the cover plate is screwed with a driving shell, the inner cavity of the driving shell is installed with a servo motor, and the output end of the servo motor is connected to a rotating shaft; The inner cavity of the driving shell is rotatably connected to a supporting shaft, and pulleys are installed on the outer sides of the supporting shaft and the rotating shaft, and a belt is commonly sleeved between the pulleys. Two groups of moving wheels are installed on the outer sides of the supporting shaft and the rotating shaft, and the lower end of the driving shell is provided with four groups of through grooves corresponding to the positions of the moving wheels, and the outer ends of the moving wheels pass through the through grooves and extend to the outside thereof.

[0013] Furthermore, the guide rail mechanism includes a base plate arranged at the lower end of the driving shell, the upper end of the base plate is symmetrically provided with track grooves corresponding to the positions of the moving wheels, four groups of telescopic legs are installed at the lower end of the base plate, the right side of the base plate is symmetrically provided with slots, and the left side of the base plate is symmetrically connected with plug blocks corresponding to the positions of the slots.

[0014] Compared with the prior art, the present invention provides an adaptive online repair and purge device for a cold-insulation structure of an LNG pipeline, which has the following beneficial effects: 1. The adaptive online repair purge device of the LNG pipeline cold preservation structure introduces nitrogen through the air intake mechanism, and then transports the nitrogen to the purge mechanism and the adaptive support mechanism respectively, and the nitrogen in the adaptive support mechanism is discharged through the second exhaust port and the second exhaust hole on the outer side of the round cover, which is convenient for pre-treatment of defrosting the surface of the LNG pipeline, and effectively improves the pre-purge effect. The adaptive support mechanism enables the Z-shaped telescopic rod to move back and forth, so that the Z-shaped telescopic rod drives the purge nozzle to perform reciprocating fine-tuning rotation while purge, that is, the purge nozzle purges the LNG pipeline surface that has been purged again while purges the LNG pipeline, further improving the purge effect of defrosting the surface of the LNG pipeline, and further increasing the effect of online repair of the LNG pipeline cold preservation structure; 2. The adaptive online repair and purge device for the LNG pipeline cold preservation structure effectively improves the support stability effect by allowing the roller of the support assembly of the adaptive support mechanism to roll on the surface of the LNG pipeline, and pushes the sealing disk and inner tube of the adaptive support mechanism with nitrogen, so that the inner tube drives the support assembly to fit the surface of the LNG pipeline, and the extended length of the inner tube is basically the same in the end, so that the distance between the adaptive support mechanism and the multiple purge mechanisms on the inner side of the air intake mechanism and the LNG pipeline surface is basically the same, which facilitates the improvement of the uniform purge effect on the surface of the LNG pipeline; 3. The adaptive online repair and purge device of the LNG pipeline cold insulation structure drives the rotating shaft to rotate through the output end of the driving shell, and the pulley on the outside of the rotating shaft rotates synchronously, and this pulley drives another pulley and the support shaft of its inner cavity to rotate through the belt, and the support shaft and the rotating shaft synchronously drive the moving wheel to rotate, so as to facilitate the movement of the device to purge different positions on the surface of the LNG pipeline, and the track groove designed on the upper end of the base plate facilitates the movement of the moving wheel in the inner cavity of the track groove, effectively improving the movement stability of the driving mechanism, and the designed telescopic legs facilitate appropriate adjustment according to the height position of the LNG pipeline, which is convenient for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a partial three-dimensional structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the air intake mechanism of the present invention; Figure 4 It is a front cross-sectional structural schematic diagram of the air intake mechanism of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the purge mechanism and the adaptive support mechanism of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the purge mechanism of the present invention in a disassembled and partially cut-away manner; Figure 7 It is a schematic diagram of the cross-sectional top view of the three-dimensional structure of the purge nozzle of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the purge nozzle of the present invention in a cut-away and bottom-up view; Fig. 9 It is a semi-sectioned three-dimensional structural schematic diagram of the adaptive support mechanism of the present invention; Fig.10 For the present invention Fig. 9 The enlarged structural diagram of the device in part A; Fig.11 It is a bottom-up three-dimensional structural schematic diagram of the support assembly of the present invention; Fig.12It is a schematic diagram of a half-section split three-dimensional structure of the driving mechanism of the present invention; Fig.13 It is a schematic diagram of the disassembled three-dimensional structure of part of the guide rail mechanism of the present invention.

[0016] In the figure: 1. air intake mechanism; 11. upper air intake cover; 12. hinge; 13. lower air intake cover; 14. air intake pipe; 15. square tube; 16. corrugated hose; 17. first magnetic column; 18. groove; 19. second magnetic column; 2. support frame; 3. drive mechanism; 31. drive shell; 32. cover plate; 33. servo motor; 34. rotating shaft; 35. support shaft; 36. pulley; 37. belt; 38. moving wheel; 39. through groove; 4. guide rail mechanism; 41. base plate; 42. track groove; 43. telescopic leg; 44. slot; 45. plug-in block; 5. purge mechanism; 51. corrugated telescopic tube; 52. side frame; 53. slide groove; 54. connecting shaft; 55. screw; 56. purge Sweep nozzle; 561, shell; 562, first exhaust port; 563, first exhaust hole; 564, guide cover; 565, notch; 57, connector; 6, adaptive support mechanism; 61, fixed column; 62, through hole; 63, square hole; 64, outer tube; 65, first spring; 66, sealing disk; 67, inner tube; 68, support assembly; 681, fixed disk; 682, round cover; 683, second exhaust port; 684, second exhaust hole; 685, side plate; 686, roller; 69, fan assembly; 610, fixed shaft; 611, sector gear; 612, rack; 613, fixed block; 614, Z-type telescopic rod; 615, mounting sleeve; 616, second spring. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] See also Figure 1-13 , an adaptive online repair and purging device of an LNG pipeline cold preservation structure, comprising an air intake mechanism 1, the air intake mechanism 1 comprising an upper air intake hood 11 and a lower air intake hood 13, the upper air intake hood 11 and the lower air intake hood 13 are rotatably connected by a hinge 12, a plurality of corrugated telescopic tubes 51 are respectively connected and installed with the inner sides of the upper air intake hood 11 and the lower air intake hood 13, the lower air intake hood 13 is screwed with a support frame 2, an air intake pipe 14 is installed on the outer side of the lower air intake hood 13, a square tube 15 is installed on one side of the lower end of the upper air intake hood 11, a corrugated hose 16 is sealed and installed in the inner cavity of the square tube 15, the lower end of the corrugated hose 16 is connected and installed in communication with the lower air intake hood 13, a first magnetic column 17 is installed on one side of the upper end of the lower air intake hood 13, a groove 18 corresponding to the position is provided on one side of the lower end of the upper air intake hood 11, and a second magnetic column 19 magnetically attracted to the first magnetic column 17 is installed on the top of the inner cavity of the groove 18.

[0019] The upper air intake hood 11 and the lower air intake hood 13 are opened and inserted into the outer side of the LNG pipeline whose cold insulation structure needs to be repaired, and then the upper air intake hood 11 and the lower air intake hood 13 are closed together at one end, and the first magnetic column 17 at one end of the lower air intake hood 13 is inserted into the groove 18 at one end of the upper air intake hood 11, and is magnetically attracted to the second magnetic column 19 in the groove 18, thereby effectively merging the upper air intake hood 11 and the lower air intake hood 13, and connecting with the external pressurized nitrogen delivery equipment through the air intake pipe 14, so that after the nitrogen enters the lower air intake hood 13 through the air intake pipe 14, part of the nitrogen enters the upper air intake hood 11 through the corrugated hose 16, so that the nitrogen enters the purge mechanism 5 on the inner side of the upper air intake hood 11 and the lower air intake hood 13, which is convenient for the subsequent defrosting and purging work.

[0020] The inner side of the air intake mechanism 1 is equidistantly provided with a purge mechanism 5, which includes a bellows telescopic tube 51 and two sets of side frames 52 installed on the inner side of the air intake mechanism 1. The outer sides of the side frames 52 are provided with slide grooves 53, and the inner cavities of the slide grooves 53 are slidably provided with connecting shafts 54, and the corresponding ends of the connecting shafts 54 are rotatably connected with purge nozzles 56, and the bottom ends of the side frames 52 are rotatably connected with screws 55, and one end of the screw 55 extends to the slide groove 53 and is connected to the connecting shaft 54. The purge nozzle 56 is screwed together, and a connector 57 is installed at the upper end of the purge nozzle 56. The connector 57 is screwed together with the bellows expansion tube 51. The purge nozzle 56 includes a shell 561 rotatably connected to the connecting shaft 54. The connector 57 is installed at the upper end of the shell 561. The lower end of the shell 561 is equidistantly provided with a first exhaust port 562 and a first exhaust hole 563. The bottom end of the shell 561 is installed with a guide cover 564, and the upper end of the guide cover 564 is symmetrically provided with slots 565.

[0021] Before defrosting and blowing, the outer diameter of the LNG pipeline of the cold insulation structure is repaired as needed, and the screw 55 is rotated, and the threaded connecting shaft 54 ​​on the outside of the screw 55 moves up or down under the limit of the slide groove 53, so that the two connecting shafts 54 drive the blowing nozzle 56, the connecting head 57 and the corrugated expansion tube 51 to move up or down, so as to facilitate the adjustment of the distance between the blowing nozzle 56 and the LNG pipeline, and to facilitate the effect of blowing and defrosting the surface of the LNG pipeline.

[0022] After the nitrogen enters the bellows 51 through the upper air inlet hood 11 and the lower air inlet hood 13, it then enters the housing 561, and the nitrogen is blown toward the two groups of first exhaust ports 562 and the first exhaust holes 563 through the two notches 565 at the upper end of the guide cover 564. Then, when part of the nitrogen is blown to the upper end surface of the guide cover 564, the upper end surface of the guide cover 564 is in an inverted V shape, so that part of the nitrogen is conveniently guided from the upper side to the two sides of the guide cover 564, and part of the nitrogen is conveniently entered from the two sides of the guide cover 564 to the other two groups of first exhaust ports. The first exhaust hole 563 is designed to be inclined, and the diameter of the first exhaust hole 563 is smaller than the first exhaust hole 562, so that most of the nitrogen can be blown away through the first exhaust hole 562 to directly purge and defrost the surface of the LNG pipeline, while a small part of the nitrogen is discharged through the inclined first exhaust hole 562 to purge the purged surface of the LNG pipeline again, thereby improving the effect of purge and defrosting for online repair of the LNG pipeline and avoiding the failure to achieve defrost, thereby facilitating use.

[0023] The outer side of the air intake mechanism 1 is equidistantly provided with an adaptive support mechanism 6, and the multiple adaptive support mechanisms 6 each include a fixed column 61, and the multiple fixed columns 61 are respectively installed on the outer sides of the upper air intake cover 11 and the lower air intake cover 13, and the inner cavity of the fixed column 61 is provided with a through hole 62, and the outer sides of the upper air intake cover 11 and the lower air intake cover 13 are provided with air holes corresponding to their positions, and the inner cavity of the fixed column 61 is provided with a square hole 63 connected to the through hole 62, and one end of the fixed column 61 is provided with an outer tube 64 corresponding to the position of the square hole 63, and the bottom end of the inner cavity of the outer tube 64 is provided with a first spring 65, and the upper end of the first spring 65 is provided with a A sealing disk 66 is installed, and the outer diameter of the sealing disk 66 matches the inner diameter of the outer tube 64. An inner tube 67 is installed in the middle of the sealing disk 66. The lower end of the inner tube 67 passes through the outer tube 64 and is connected to the support assembly 68 after extending to its lower end. The support assembly 68 includes a round cover 682 connected to the lower end of the inner tube 67. A group of second exhaust ports 683 and two groups of second exhaust holes 684 are arranged on the outer side of the round cover 682. A fixed disk 681 is installed on the outer side of the inner tube 67. One end of the fixed disk 681 is symmetrically connected to a side plate 685. The side plate 685 and the round cover 682 are rotatably connected to rollers 686 through pins.

[0024] When the nitrogen passes through the upper air inlet hood 11 and the lower air inlet hood 13, most of the nitrogen enters the purge mechanism 5, and part of the nitrogen enters the through hole 62 of the inner cavity of the fixed column 61 from the air holes on the outside of the upper air inlet hood 11 and the lower air inlet hood 13, and then flows from the through hole 62 to the square hole 63, and finally enters the outer tube 64. Since the nitrogen is pressurized during transportation, and the inner diameter of the inner tube 67 is smaller than the inner diameter of the outer tube 64, most of the nitrogen will impact the sealing disk 66 on the outside of the inner tube 67 when entering the outer tube 64, and a small part of the nitrogen enters the inner cavity of the inner tube 67. The sealing disk 66 compresses the first spring 65 as the nitrogen impacts it, and at the same time the sealing disk 66 drives the inner tube 67 to move in the direction away from the outer tube 64, that is, the inner tube 67 drives the support assembly 68 to move toward the surface of the LNG pipeline.

[0025] Furthermore, since the multiple groups of inner tubes 67 and the support assembly 68 are subjected to substantially the same nitrogen pushing pressure, when the multiple groups of inner tubes 67 simultaneously drive the support assembly 68 to move to the surface of the LNG pipeline and come into contact with it by being squeezed, the extended length of each group of inner tubes 67 is substantially the same, so that the adaptive support mechanism 6 drives the multiple purge mechanisms 5 on the inner side of the air intake mechanism 1 to be substantially the same distance from the surface of the LNG pipeline, thereby facilitating the uniform purge effect on the surface of the LNG pipeline, and when the nitrogen enters the circular cover 682 through the inner tubes 67, it is discharged through a group of second exhaust ports 683 and two groups of second exhaust holes 684 on the outer side of the circular cover 682, thereby facilitating the defrosting pretreatment of the surface of the LNG pipeline, thereby effectively improving the purge effect of the device, and when the driving mechanism 3 drives the air intake mechanism 1 and the adaptive support mechanism 6 to move through the support frame 2, the roller 686 of the support assembly 68 rolls on the surface of the LNG pipeline, thereby effectively improving the support stability effect.

[0026] Each adaptive supporting mechanism 6 is connected to the purge mechanism 5, and a fan assembly 69 is installed on the upper part of the inner cavity of the outer tube 64. The fan assembly 69 includes a mounting frame installed on the inner wall of the outer tube 64, and the middle part of the mounting frame is rotatably connected to the fan shaft, and fan blades are equidistantly installed on the outside of the fan shaft. A fixed shaft 610 is installed at the lower end of the fan shaft, and a fan gear 611 is installed on the outside of the fixed shaft 610. A rack 612 is meshed on the outside of the fan gear 611, and one side of the rack 612 is connected to a Z-shaped telescopic rod 614 through a fixed block 613. One end of the Z-shaped telescopic rod 614 passes through the outer tube 64 and is connected to a shell 561. A mounting sleeve 615 slidably sleeved on the outside of the Z-shaped telescopic rod 614 is installed on the inner wall of the outer tube 64, and a second spring 616 is installed between the mounting sleeve 615 and the fixed block 613.

[0027] When the nitrogen enters the inner cavity of the outer tube 64, the nitrogen first blows the blades of the fan assembly 69, so that the blades drive the fan shaft and the fixed shaft 610 to rotate, and the fan gear 611 outside the fixed shaft 610 intermittently drives the rack 612 meshing therewith to move, and the rack 612 compresses the second spring 616 through the fixed block 613 while moving, and drives the Z-shaped telescopic rod 614 to move through the fixed block 613, and the Z-shaped telescopic rod 614 pushes the shell 561 to move, and the shell 561 is rotatably connected to the connecting shaft 54, so that the shell 561 is 61 will perform a micro-angle tilt rotation, and when the sector gear 611 leaves one side of the rack 612, the second spring 616 will reset, driving the fixed block 613, the rack 612 and the Z-shaped telescopic rod 614 to reset, thereby driving the shell 561 to reset, so that the purge nozzle 56 can perform angle reciprocating fine-tuning rotation while purging, that is, the purge nozzle 56 purges the LNG pipeline surface that has been purged again while purging the LNG pipeline, further improving the purge effect of defrosting the LNG pipeline surface, and facilitating use.

[0028] The lower end of the air intake mechanism 1 is screwed with a support frame 2, and the lower end of the support frame 2 is equipped with a driving mechanism 3, which includes a cover plate 32 installed at the lower end of the support frame 2, and the lower end of the cover plate 32 is screwed with a driving shell 31, and a servo motor 33 is installed in the inner cavity of the driving shell 31, and the output end of the servo motor 33 is connected to a rotating shaft 34, and the inner cavity of the driving shell 31 is rotatably connected to a support shaft 35, and the outer sides of the support shaft 35 and the rotating shaft 34 are both installed with pulleys 36, and a belt 37 is commonly sleeved between the pulleys 36, and two groups of moving wheels 38 are installed on the outer sides of the support shaft 35 and the rotating shaft 34, and the lower end of the driving shell 31 is provided with four groups of through grooves 39 corresponding to the positions of the moving wheels 38, and the outer ends of the moving wheels 38 pass through the through grooves 39 and extend to the outside thereof, and a battery can be installed inside the driving shell 31 to power the servo motor 33, or the servo motor 33 can be directly electrically connected to an external power supply through wires.

[0029] The output end of the driving shell 31 drives the rotating shaft 34 to rotate, and the pulley 36 on the outside of the rotating shaft 34 rotates synchronously, and this pulley 36 drives another pulley 36 and the support shaft 35 in its inner cavity to rotate through the belt 37, and the support shaft 35 and the rotating shaft 34 synchronously drive the moving wheel 38 to rotate, thereby making it convenient to move this device and perform purging work on different positions on the surface of the LNG pipeline.

[0030] A guide rail mechanism 4 is provided at the lower end of the driving mechanism 3, and the guide rail mechanism 4 includes a base plate 41 arranged at the lower end of the driving shell 31, and a track groove 42 corresponding to the position of the moving wheel 38 is symmetrically provided at the upper end of the base plate 41, and four groups of telescopic legs 43 are installed at the lower end of the base plate 41, and a slot 44 is symmetrically provided on the right side of the base plate 41, and an insert block 45 corresponding to the position of the slot 44 is symmetrically connected to the left side of the base plate 41.

[0031] By designing the track groove 42 on the upper end of the base plate 41, it is convenient for the moving wheel 38 to move in the inner cavity of the track groove 42, which effectively improves the movement stability of the driving mechanism 3, and the designed telescopic legs 43 are convenient for appropriate adjustment according to the height position of the LNG pipeline, which is convenient for use, and plug blocks 45 and slots 44 are respectively arranged on both sides of the base plate 41, so that multiple base plates 41 can be plugged into each other through the plug blocks 45 and slots 44 on their outer sides, thereby increasing the length of the guide rail mechanism 4, which is convenient for adapting to the use of LNG pipelines of different lengths that need to be repaired.

[0032] Working principle: The present invention is connected to the servo motor 33 through an external controller. When in use, the upper air intake hood 11 and the lower air intake hood 13 are separated, so that the upper air intake hood 11 and the lower air intake hood are inserted into the outer side of the LNG pipeline whose cold preservation structure needs to be repaired, and then one end of the upper air intake hood 11 and the lower air intake hood 13 are closed together, and the first magnetic column 17 at one end of the lower air intake hood 13 is inserted into the groove 18 at one end of the upper air intake hood 11, and is magnetically attracted to the second magnetic column 19 in the groove 18, so that the upper air intake hood 11 and the lower air intake hood 13 are effectively merged; Before defrosting and purging, the outer diameter of the LNG pipeline of the cold-insulating structure is repaired as needed, and the screw 55 is rotated, and the threaded connecting shaft 54 ​​on the outside of the screw 55 moves up or down under the limit of the slide groove 53, so that the two connecting shafts 54 drive the purge nozzle 56, the connector 57 and the bellows telescopic tube 51 to move up or down, which is convenient for adjusting the distance between the purge nozzle 56 and the LNG pipeline, and convenient for increasing the effect of purging and defrosting the surface of the LNG pipeline. It is connected to the external pressurized nitrogen delivery equipment through the air inlet pipe 14, and then the support frame 2 and the driving mechanism 3 are installed. According to the height of the LNG pipeline, the height of the telescopic legs 43 of the guide rail mechanism 4 is appropriately adjusted, and then the moving wheel 38 of the driving mechanism 3 is placed in the track groove 42 of the base plate 41; After the nitrogen enters the bellows 51 through the upper air inlet hood 11 and the lower air inlet hood 13, it then enters the housing 561, and the nitrogen is blown toward the two groups of first exhaust ports 562 and the first exhaust holes 563 through the two notches 565 at the upper end of the guide cover 564. Then, when part of the nitrogen is blown to the upper end surface of the guide cover 564, the upper end surface of the guide cover 564 is in an inverted V shape, so that part of the nitrogen is conveniently guided from the upper side to the two sides of the guide cover 564, and part of the nitrogen is conveniently entered from the two sides of the guide cover 564 to the other two groups of first exhaust ports 562 and first exhaust holes 563. An exhaust port 562 and a first exhaust hole 563, and the first exhaust hole 563 is designed to be inclined, and the diameter of the first exhaust hole 563 is smaller than the first exhaust port 562, so that most of the nitrogen is blown away through the first exhaust port 562, and the surface of the LNG pipeline is directly purged and defrosted, while a small part of the nitrogen is discharged through the inclined first exhaust port 562, and the purged surface of the LNG pipeline is purged again, thereby improving the effect of defrosting and defrosting of the online repair of the LNG pipeline and avoiding the failure of defrosting; At the same time, part of the nitrogen enters the through hole 62 of the inner cavity of the fixed column 61 from the air holes on the outer side of the upper air inlet cover 11 and the lower air inlet cover 13, and then enters the outer tube 64 from the through hole 62 and the square hole 63. The nitrogen first blows the blades of the fan assembly 69, so that the blades drive the fan shaft and the fixed shaft 610 to rotate, and the fan gear 611 on the outer side of the fixed shaft 610 intermittently drives the gear rack 612 meshing therewith to move, and the gear rack 612 compresses the second spring 616 through the fixed block 613 while moving, and at the same time drives the Z-shaped telescopic rod 614 to move through the fixed block 613, and the Z-shaped telescopic rod 614 pushes the shell 56 1 moves, and the housing 561 is rotationally connected to the connecting shaft 54, so the housing 561 will tilt and rotate at a slight angle, and when the sector gear 611 leaves one side of the rack 612, the second spring 616 is reset, driving the fixing block 613, the rack 612 and the Z-shaped telescopic rod 614 to reset, thereby driving the housing 561 to reset, so that the purge nozzle 56 can perform reciprocating fine-tuning rotation of the angle while purge, that is, the purge nozzle 56 purges the LNG pipeline surface that has been purged again while purges the LNG pipeline, further improving the purge effect of defrosting the LNG pipeline surface; At the same time, the nitrogen impacts the sealing disk 66 on the outside of the inner tube 67, and a small part of the nitrogen enters the inner cavity of the inner tube 67. The sealing disk 66 compresses the first spring 65 with the impact of the nitrogen. At the same time, the sealing disk 66 drives the inner tube 67 to move in the direction away from the outer tube 64, that is, the inner tube 67 drives the support assembly 68 to move toward the surface of the LNG pipeline. Because the nitrogen pushing force of multiple groups of inner tubes 67 and the support assembly 68 is basically the same, when multiple groups of inner tubes 67 drive the support assembly 68 to move to the surface of the LNG pipeline and squeeze and contact with it, the extended length of each group of inner tubes 67 is basically the same, so that the adaptive support mechanism 6 drives the multiple purge mechanisms 5 on the inner side of the air intake mechanism 1 to be basically the same distance from the LNG pipeline surface, which is convenient for improving the effect of uniformly purging the LNG pipeline surface. After the nitrogen enters the round cover 682 through the inner tube 67, it is discharged through a group of second exhaust ports 683 and two groups of second exhaust holes 684 on the outside of the round cover 682, which is convenient for pre-treatment of defrosting the surface of the LNG pipeline and effectively improves the purge effect of this device. When the driving mechanism 3 drives the air intake mechanism 1 and the adaptive support mechanism 6 to move through the support frame 2, the roller 686 of the support assembly 68 rolls on the surface of the LNG pipeline, effectively improving the support stability effect, and then drives the rotating shaft 34 to rotate through the output end of the driving shell 31, and the pulley 36 on the outside of the rotating shaft 34 rotates synchronously, and this pulley 36 drives another pulley 36 and the support shaft 35 in its inner cavity to rotate through the belt 37, and the support shaft 35 and the rotating shaft 34 synchronously drive the moving wheel 38 to rotate, thereby facilitating the movement of this device to perform blowing work on different positions on the surface of the LNG pipeline.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adaptive online repair and purge device for a cold-insulation structure of an LNG pipeline, comprising an air intake mechanism (1), characterized in that: A plurality of purge mechanisms (5) are equidistantly mounted on the inner side of the air intake mechanism (1), and a plurality of adaptive support mechanisms (6) are equidistantly mounted on the outer side of the air intake mechanism (1), each adaptive support mechanism (6) being connected to a corresponding purge mechanism (5); The lower end of the air intake mechanism (1) is screwed with a support frame (2), the lower end of the support frame (2) is mounted with a drive mechanism (3), and the lower end of the drive mechanism (3) is provided with a guide rail mechanism (4); The purge mechanism (5) comprises a bellows telescopic tube (51) mounted on the inner side of the air intake mechanism (1) and two sets of side frames (52), the outer sides of the side frames (52) are each provided with a slide groove (53), the inner cavity of the slide groove (53) is each provided with a connecting shaft (54) in a sliding manner, the corresponding end of the connecting shaft (54) is rotatably connected to a purge nozzle (56), the bottom ends of the side frames (52) are each rotatably connected to a screw rod (55), one end of the screw rod (55) extends to the slide groove (53) and is screwed to the connecting shaft (54), the upper end of the purge nozzle (56) is provided with a connector (57), and the connector (57) is screwed to the bellows telescopic tube (51).

2. The LNG pipeline cold insulation structure adaptive online repair and purge device according to claim 1 is characterized by: The air intake mechanism (1) comprises an upper air intake cover (11) and a lower air intake cover (13), wherein the upper air intake cover (11) and the lower air intake cover (13) are rotatably connected via a hinge (12), wherein a plurality of the bellows telescopic tubes (51) are respectively connected and installed to the inner sides of the upper air intake cover (11) and the lower air intake cover (13); The lower air intake cover (13) is screwed to the support frame (2); an air intake pipe (14) is installed on the outer side of the lower air intake cover (13); a square tube (15) is installed on one side of the lower end of the upper air intake cover (11); a corrugated hose (16) is installed in a sealing manner in the inner cavity of the square tube (15); and the lower end of the corrugated hose (16) is connected to the lower air intake cover (13) and installed; A first magnetic column (17) is mounted on one side of the upper end of the lower air inlet cover (13), a groove (18) corresponding to the position thereof is provided on one side of the lower end of the upper air inlet cover (11), and a second magnetic column (19) magnetically attracted to the first magnetic column (17) is mounted on the top of the inner cavity of the groove (18).

3. The LNG pipeline cold insulation structure adaptive online repair and purge device according to claim 2 is characterized by: The purge nozzle (56) comprises a shell (561) rotatably connected to the connecting shaft (54), the connecting head (57) is mounted on the upper end of the shell (561), and the lower end of the shell (561) is equidistantly provided with a first exhaust port (562) and a first exhaust hole (563).

4. The LNG pipeline cold insulation structure adaptive online repair and purge device according to claim 3 is characterized by: A flow guide cover (564) is installed at the bottom end of the shell (561), and notches (565) are symmetrically arranged at the upper end of the flow guide cover (564).

5. The LNG pipeline cold insulation structure adaptive online repair and purge device according to claim 4 is characterized by: The plurality of adaptive support mechanisms (6) each comprises a fixing column (61), the plurality of fixing columns (61) being respectively mounted on the outer sides of an upper air intake hood (11) and a lower air intake hood (13), the inner cavities of the plurality of fixing columns (61) each being provided with a through hole (62), and the outer sides of the upper air intake hood (11) and the lower air intake hood (13) each being provided with an air hole corresponding to the position thereof; The inner cavity of the fixing column (61) is provided with a square hole (63) connected to the through hole (62); one end of the fixing column (61) is provided with an outer tube (64) corresponding to the position of the square hole (63); a first spring (65) is provided at the bottom end of the inner cavity of the outer tube (64); a sealing disk (66) is provided at the upper end of the first spring (65); the outer diameter of the sealing disk (66) matches the inner diameter of the outer tube (64); an inner tube (67) is provided in the middle of the sealing disk (66); the lower end of the inner tube (67) penetrates the outer tube (64) and is connected to a support assembly (68) after extending to the lower end thereof.

6. The LNG pipeline cold preservation structure adaptive online repair and purge device according to claim 5 is characterized by: The support assembly (68) comprises a circular cover (682) connected to the lower end of the inner tube (67); a group of second exhaust ports (683) and two groups of second exhaust holes (684) are arranged on the outer side of the circular cover (682); a fixed plate (681) is installed on the outer side of the inner tube (67); one end of the fixed plate (681) is symmetrically connected to a side plate (685); and a roller (686) is rotatably connected between the side plate (685) and the circular cover (682) via a pin shaft.

7. The LNG pipeline cold insulation structure adaptive online repair and purge device according to claim 5 is characterized by: A fan assembly (69) is installed at the upper part of the inner cavity of the outer tube (64), and the fan assembly (69) comprises a mounting frame installed on the inner wall of the outer tube (64), a fan shaft is rotatably connected to the middle of the mounting frame, fan blades are equidistantly installed on the outer side of the fan shaft, a fixed shaft (610) is installed at the lower end of the fan shaft, and a fan gear (611) is installed on the outer side of the fixed shaft (610); A rack (612) is meshed on the outer side of the sector gear (611); one side of the rack (612) is connected to a Z-shaped telescopic rod (614) via a fixing block (613); one end of the Z-shaped telescopic rod (614) passes through the outer tube (64) and is connected to a housing (561); The inner wall of the outer tube (64) is provided with a mounting sleeve (615) which is slidably sleeved on the outer side of the Z-shaped telescopic rod (614), and a second spring (616) is installed between the mounting sleeve (615) and the fixing block (613).

8. The LNG pipeline cold preservation structure adaptive online repair and purge device according to claim 2 is characterized by: The driving mechanism (3) comprises a cover plate (32) mounted on the lower end of the support frame (2); a driving shell (31) is screwed to the lower end of the cover plate (32); a servo motor (33) is mounted in the inner cavity of the driving shell (31); and an output end of the servo motor (33) is connected to a rotating shaft (34); The inner cavity of the driving shell (31) is rotatably connected to a support shaft (35); pulleys (36) are installed on the outer sides of the support shaft (35) and the rotating shaft (34); a belt (37) is sleeved between the pulleys (36); two groups of moving wheels (38) are installed on the outer sides of the support shaft (35) and the rotating shaft (34); four groups of through grooves (39) corresponding to the positions of the moving wheels (38) are provided at the lower end of the driving shell (31); and the outer ends of the moving wheels (38) pass through the through grooves (39) and extend to the outer sides thereof.

9. The adaptive online repair and purge device for the cold-insulation structure of the LNG pipeline according to claim 8 is characterized by: The guide rail mechanism (4) comprises a base plate (41) arranged at the lower end of the drive housing (31); a track groove (42) corresponding to the position of the moving wheel (38) is symmetrically arranged at the upper end of the base plate (41); four groups of telescopic legs (43) are installed at the lower end of the base plate (41); a slot (44) is symmetrically arranged on the right side of the base plate (41); and an insert block (45) corresponding to the position of the slot (44) is symmetrically connected to the left side of the base plate (41).

Images