Repairing device for cold insulation structure of LNG (Liquefied Natural Gas) pipeline

Abstract

The utility model relates to the technical field of LNG pipeline cold insulation structure repairing, and discloses an LNG pipeline cold insulation structure repairing device which comprises a supporting seat, a supporting rod is installed on the supporting seat, an arc-shaped frame is fixedly installed on the supporting rod, an arc-shaped groove is formed in the arc-shaped frame, and an arc-shaped block is arranged in the arc-shaped groove in a sliding mode. A plurality of nitrogen nozzles which are distributed at equal angles are mounted on the inner wall of the arc-shaped block; according to the LNG pipeline cleaning device, the driving mechanism drives the arc-shaped block to be contained in the arc-shaped groove of the arc-shaped frame, at the moment, an LNG pipeline can be conveniently placed in the arc-shaped frame, the LNG pipeline can make contact with the cleaning mechanism, and then nitrogen is blown to the surface of the LNG pipeline through the nitrogen nozzles on the inner wall of the arc-shaped block; and in the process of moving in the axial direction of the LNG pipeline along with the arc-shaped frame, the frost on the surface of the LNG pipeline can be scraped and cleaned through the cleaning mechanism, and an auxiliary nitrogen spray head can fully clean the frost on the LNG pipeline.

Description

TECHNICAL FIELD

[0001] The utility model relates to LNG pipeline cold insulation structure repair technical field, specifically a kind of LNG pipeline cold insulation structure repair device. BACKGROUND

[0002] LNG pipeline is the pipeline system for transporting liquefied natural gas (LNG), and the temperature of LNG is usually around -162℃, so a material capable of maintaining good toughness and strength at low temperature is required. The LNG pipeline cold insulation structure generally includes, from the inside out, an insulation layer, a moisture-proof layer, a protective layer, etc.

[0003] During the online repair of LNG pipeline, after the old cold insulation material is removed, a layer of frost will appear on the exposed pipeline surface within 1 minute in the natural state without any operation, forming a cold bridge between the exposed pipeline and the new cold insulation material, resulting in a loss of cold energy. In some cases, the thick frost is not conducive to the installation of new cold insulation material, resulting in gaps and a cold insulation effect worse than before repair. Currently, cleaning is usually done with a cloth or by pouring and wiping anhydrous ethanol on the pipeline surface, or nitrogen gas is blown to remove frost. However, the above methods require repair workers to be close to the LNG pipeline for a long time and to wear personal protective equipment, which is inconvenient. The nitrogen gas blowing method cannot completely remove the frost on the LNG pipeline surface, so improvement is needed. Therefore, a LNG pipeline cold insulation structure repair device is proposed to solve the problems mentioned in the background. SUMMARY

[0004] The purpose of the present utility model is to provide a LNG pipeline cold insulation structure repair device to solve the problems mentioned in the background.

[0005] To achieve the above purpose, the present utility model provides the following technical solutions:

[0006] A LNG pipeline cold insulation structure repair device includes a support seat, a support rod mounted on the support seat, an arc-shaped bracket fixedly installed on the support rod, an arc-shaped slot formed in the arc-shaped bracket, and an arc-shaped block slidingly arranged in the arc-shaped slot. The center of the arc-shaped block and the arc-shaped bracket coincides, and the inner wall of the arc-shaped block is installed with a plurality of equiangularly distributed nitrogen gas nozzles for spraying nitrogen gas to remove frost. The device further includes:

[0007] A driving mechanism is arranged on the arc-shaped bracket to drive the arc-shaped block to slide along the arc-shaped slot.

[0008] A cleaning mechanism is arranged on the arc-shaped block to assist the nitrogen gas nozzles in cleaning the frost on the LNG pipeline.

[0009] As a further scheme of the utility model: the cleaning mechanism includes the connecting block installed in the inner wall both ends of arc block, the movable axle is rotationally arranged in the connecting block, the connecting head is installed on the movable axle, the flexible scraper is arranged between two connecting heads.

[0010] As a further scheme of the utility model: the driving mechanism includes the support installed in the side wall of arc frame, the rotating shaft is rotationally arranged on the support, the gear is installed on the rotating shaft, the outer wall of arc block is provided with the incomplete gear ring, the incomplete gear ring is engaged with the gear, the motor connected with the rotating shaft is installed on the support.

[0011] As a further scheme of the utility model: the reinforcing rod connected with arc frame is installed on the support seat.

[0012] As a further scheme of the utility model: the hydraulic rod is installed at the bottom of support seat, the hydraulic rod is fixedly connected with the sliding plate, the bottom of sliding plate is provided with the base, the slide rail is formed in the base, and the slide rail is slidably connected with the sliding plate.

[0013] Compared with the prior art, the utility model has the beneficial effects that: the arc block is driven into the arc groove of arc frame by the driving mechanism, the LNG pipeline can be conveniently placed in the interior of arc frame, the LNG pipeline contacts the cleaning mechanism, nitrogen is blown to the surface of LNG pipeline by the nitrogen jet on the inner wall of arc block, the surface of LNG pipeline is deiced and defrosted, the ice and frost on the surface of LNG pipeline is scraped and cleaned by the cleaning mechanism during the movement of arc frame along the axial direction of LNG pipeline, the ice and frost on LNG pipeline can be fully cleaned by the auxiliary nitrogen jet, the deicing and defrosting position of LNG pipeline by arc frame can be changed by the driving mechanism, the contact position of cleaning mechanism and LNG pipeline is changed, and the deicing and defrosting operation can be performed on different positions of LNG pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is a kind of LNG pipeline cold insulation structure repair device structural schematic diagram.

[0015] Fig. 2 It is a kind of LNG pipeline cold insulation structure repair device structural schematic diagram of arc frame and arc block.

[0016] Fig. 3 It is a kind of LNG pipeline cold insulation structure repair device driving mechanism structural schematic diagram.

[0017] In the figure: 1, support seat; 2, support rod; 3, reinforcing rod; 4, arc-shaped frame; 5, arc-shaped groove; 6, arc-shaped block; 7, nitrogen jet; 8, incomplete tooth ring; 9, support; 10, rotating shaft; 11, gear; 12, motor; 13, connecting block; 14, movable shaft; 15, connecting head; 16, flexible scraper; 17, base; 18, slide rail; 19, slide plate; 20, hydraulic rod. DETAILED DESCRIPTION

[0018] The technical solutions of the patent will be further described in detail in combination with specific embodiments.

[0019] Please refer to Figs. 1-3 A LNG pipeline cold insulation structure repairing device, comprising a support seat 1, a support rod 2 is installed on the support seat 1, an arc-shaped frame 4 is fixedly installed on the support rod 2, an arc-shaped groove 5 is formed in the arc-shaped frame 4, an arc-shaped block 6 is slidably arranged in the arc-shaped groove 5, the center of the arc-shaped block 6 and the arc-shaped frame 4 coincide, a plurality of equiangular nitrogen jets 7 are installed on the inner wall of the arc-shaped block 6 for blowing nitrogen to remove ice and snow, the nitrogen jets 7 are connected with an external storage tank for storing nitrogen to provide nitrogen for the nitrogen jets 7, and further comprising:

[0020] A driving mechanism is arranged on the arc-shaped frame 4 for driving the arc-shaped block 6 to slide along the arc-shaped groove 5;

[0021] A cleaning mechanism is arranged on the arc-shaped block 6 for assisting the nitrogen jets 7 to clean the ice and snow on the LNG pipeline.

[0022] The arc-shaped block 6 is driven by the driving mechanism to be received in the arc-shaped groove 5 of the arc-shaped frame 4, at this time, the LNG pipeline can be conveniently placed in the interior of the arc-shaped frame 4, and the LNG pipeline will be in contact with the cleaning mechanism, then the nitrogen jets 7 on the inner wall of the arc-shaped block 6 blow nitrogen to the surface of the LNG pipeline, so as to remove the ice and snow on the surface of the LNG pipeline, and during the movement of the arc-shaped frame 4 along the axial direction of the LNG pipeline, the ice and snow on the surface of the LNG pipeline can be scraped and cleaned by the cleaning mechanism, the nitrogen jets 7 can be assisted to fully clean the ice and snow on the LNG pipeline, and the driving mechanism can change the ice and snow removal position of the arc-shaped frame 4 on the LNG pipeline, and simultaneously change the contact position of the cleaning mechanism with the LNG pipeline, so that the ice and snow removal operation can be performed on different positions of the LNG pipeline, and the ice and snow on the surface of the LNG pipeline can be fully cleaned without the repair personnel staying at the side of the LNG pipeline for a long time.

[0023] In one case of the embodiment, the cleaning mechanism comprises connecting blocks 13 installed on the inner walls of the arc-shaped block 6, a movable shaft 14 is rotatably arranged in the connecting blocks 13, connecting heads 15 are installed on the movable shaft 14, and a flexible scraper 16 is arranged between the two connecting heads 15.

[0024] The arc-shaped block 6 is driven into the arc-shaped groove 5 of the arc-shaped frame 4 by the driving mechanism, at this time, the arc-shaped frame 4 can be conveniently placed outside the LNG pipeline, and the arc-shaped frame 4 is coincided with the axis position of the LNG pipeline, and due to the existence of the flexible scraper 16, the flexible scraper 16 is pressed on the surface of the LNG pipeline, so as to remove the ice and snow on the surface of the LNG pipeline, and during the movement of the arc-shaped frame 4 along the axis of the LNG pipeline, the ice and snow on the surface of the LNG pipeline can be scraped and cleaned by the flexible scraper 16, and the auxiliary nitrogen jet head 7 can fully clean the ice and snow on the LNG pipeline.

[0025] In one case of the embodiment, the driving mechanism comprises a support 9 installed on the side wall of the arc-shaped frame 4, a rotating shaft 10 is rotatably arranged on the support 9, a gear 11 is installed on the rotating shaft 10, the outer wall of the arc-shaped block 6 is provided with an incomplete tooth ring 8, the incomplete gear 11 is engaged with the gear 11, and a motor 12 connected with the rotating shaft 10 is installed on the support 9.

[0026] When it is necessary to drive the arc-shaped block 6 to slide along the arc-shaped groove 5, the motor 12 can be started to drive the rotating shaft 10 to rotate, the rotating shaft 10 drives the gear 11 to rotate, thereby driving the incomplete tooth ring 8 to rotate, and the incomplete tooth ring 8 drives the arc-shaped block 6 to slide along the arc-shaped groove 5, so as to change the positions of the nitrogen jet head 7 and the flexible scraper 16, thereby the ice and snow removal operation can be performed on different positions of the LNG pipeline.

[0027] In one case of the embodiment, the support base 1 is provided with a reinforcing rod 3 connected with the arc-shaped frame 4, which is used to improve the use stability of the arc-shaped frame 4.

[0028] In one case of the embodiment, the bottom of the support base 1 is provided with hydraulic rods 20, the plurality of hydraulic rods 20 are synchronized through a synchronization valve, the hydraulic rods 20 are fixedly connected with sliding plates 19, the bottom of the sliding plate 19 is provided with a base 17, the base 17 is provided with sliding rails 18, and the sliding rails 18 are slidably connected with the sliding plates 19.

[0029] In the initial state, the base 17 is placed on the ground, and then the support seat 1 is driven to move up by the hydraulic rod 20, so that the arc-shaped frame 4 is moved to the same height as the LNG pipeline, and after the arc-shaped frame 4 is placed outside the LNG pipeline and the arc-shaped frame 4 is coincided with the axial position of the LNG pipeline, the arc-shaped frame 4 is coincided with the axial position of the LNG pipeline by the extension and retraction of the hydraulic rod 20 and the adjustment of the position of the base 17, then the base 17 is fixed, and the sliding plate 19 is driven to move along the sliding rail 18 by the driving device on the base 17.

[0030] The arc-shaped block 6 is driven by the driving mechanism to be received in the arc-shaped groove 5 of the arc-shaped frame 4, at this time, the LNG pipeline can be conveniently placed in the arc-shaped frame 4, and the LNG pipeline is in contact with the cleaning mechanism, then the nitrogen gas is blown to the surface of the LNG pipeline by the nitrogen gas jet head 7 on the inner wall of the arc-shaped block 6, so that the surface of the LNG pipeline is deiced and defrosted, and during the movement of the arc-shaped frame 4 along the axial direction of the LNG pipeline, the ice and frost on the surface of the LNG pipeline can be scraped and cleaned by the cleaning mechanism, the auxiliary nitrogen gas jet head 7 can fully clean the ice and frost on the LNG pipeline, and the driving mechanism can change the deicing and defrosting position of the arc-shaped frame 4 on the LNG pipeline, and simultaneously change the contact position of the cleaning mechanism and the LNG pipeline, so that the deicing and defrosting operation can be performed on different positions of the LNG pipeline, and the ice and frost on the surface of the LNG pipeline can be fully cleaned without the repair personnel staying on the side of the LNG pipeline for a long time during the cleaning of the ice and frost on the surface of the LNG pipeline.

Claims

1. A repair device for the cold insulation structure of an LNG pipeline, comprising a support base, characterized in that, A support rod is mounted on the support base, and an arc-shaped frame is fixedly mounted on the support rod. An arc-shaped groove is formed within the arc-shaped frame, and an arc-shaped block is slidably disposed within the arc-shaped groove. The center of the arc-shaped block coincides with the center of the arc-shaped frame. Several nitrogen nozzles distributed at equal angles are mounted on the inner wall of the arc-shaped block for spraying nitrogen gas for de-icing. The system also includes: A driving mechanism, which is mounted on an arc-shaped frame, is used to drive the arc-shaped block to slide along the arc-shaped groove; A cleaning mechanism, mounted on an arc-shaped block, is used to assist the nitrogen nozzle in cleaning frost off the LNG pipeline.

2. The LNG pipeline insulation structure repair device according to claim 1, characterized in that, The cleaning mechanism includes connecting blocks installed at both ends of the inner wall of the arc-shaped block. A movable shaft is rotatably arranged inside the connecting block, and a connector is installed on the movable shaft. A flexible scraper is arranged between the two connectors.

3. The LNG pipeline insulation structure repair device according to claim 2, characterized in that, The drive mechanism includes a bracket mounted on the side wall of the arc-shaped frame, a rotating shaft rotatably mounted on the bracket, a gear mounted on the rotating shaft, an incomplete gear ring on the outer wall of the arc-shaped block, the incomplete gear meshing with the gear, and a motor connected to the rotating shaft mounted on the bracket.

4. The LNG pipeline insulation structure repair device according to claim 1, characterized in that, The support base is equipped with a reinforcing rod that is connected to the arc-shaped frame.

5. The LNG pipeline insulation structure repair device according to claim 1, characterized in that, A hydraulic rod is installed at the bottom of the support base, and the hydraulic rod is fixedly connected to the slide plate. A base is provided at the bottom of the slide plate, and a slide rail is provided on the base. The slide rail is slidably connected to the slide plate.

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