A liquid storage tank diaphragm weld portion pressing support

Abstract

The utility model relates to a press support part of tank diaphragm welding position technical field, especially a kind of press support part of liquid tank diaphragm welding position, including support press frame, press cylinder is equipped on support press frame, first cylinder rod is equipped on press cylinder, press support part is equipped on first cylinder rod, damping layer is equipped on press support part, main base plate is equipped in the below of support press frame, main support and stair are equipped on main base plate, side frame and rotary motor are equipped on main support, horizontal cylinder is equipped on side frame, second cylinder rod is equipped on horizontal cylinder, second cylinder rod is fixedly arranged with support press frame, clamping cylinder is equipped on the motor shaft of rotary motor, third cylinder rod is equipped on clamping cylinder, clamping plate is equipped on third cylinder rod. The press stability of the welding position of the film type storage tank shell and the cylindrical diaphragm cylinder opening on liquefied natural gas ship body is improved, the structural stability between first cylinder rod and press support part is improved, and laser welding operation of the welding operator to the other end opening welding position is facilitated.

Description

Technical Field

[0001] This utility model relates to the technical field of pressing support for the welding part of the diaphragm of a storage tank, and in particular to a pressing support for the welding part of the diaphragm of a liquid storage tank. Background Technology

[0002] Ships transporting liquefied natural gas (LNG) are widely used in international energy trade, energy supply, and gas supply to offshore platforms. LNG storage tanks are typically installed on these ships.

[0003] LNG carriers typically employ two main designs for their storage tanks: membrane tanks and freestanding tanks. Membrane tanks have a cylindrical shell structure with a mounting bracket at the bottom. The mounting bracket has pre-drilled mounting holes, and the tank is later secured to the ship's hull using bolts.

[0004] After the outer shell of the carbon steel membrane-type storage tank is manufactured on the workbench, it is cylindrical with open ends to facilitate the welding of stainless steel cylindrical diaphragm tubes to the inner wall of the tank shell. The welded diaphragm tubes can improve the low-temperature toughness and corrosion resistance of the inner wall of the membrane-type storage tank. Later, the openings at both ends of the membrane-type storage tank shell will be welded and sealed.

[0005] During the specific welding operation, the cylindrical tank shell is first clamped, then the cylindrical diaphragm tube is placed into the tank shell, followed by manual laser welding for fixation. Finally, the two matching caps are welded to the two ends of the cylindrical tank shell. Later, an installation frame will be welded to the bottom of the tank shell for later shipment and installation on the ship hull.

[0006] When welding the connection between the cylindrical tank shell and the cylindrical diaphragm tube opening, it is necessary to press down on both the tank shell and the opening of the cylindrical diaphragm tube to ensure the tightness of the weld. However, the existing method generally uses multiple bolts to press down on the support components. This clamping and pressing support method has poor stability and greatly reduces the pressing stability of the support components at the welding point between the membrane tank shell and the cylindrical diaphragm tube opening on the liquefied natural gas ship hull.

[0007] To address this, we designed a diaphragm welding and pressing support for the outer shell of a membrane-type storage tank on a liquefied natural gas (LNG) ship, meeting the needs of practical applications. Utility Model Content

[0008] The purpose of this utility model is to address the aforementioned shortcomings in the existing technology by proposing a pressing support for the welding part of the diaphragm in a liquid storage tank.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] Design a pressing support for the diaphragm welding part of a liquid storage tank, including a supporting frame, a pressing cylinder on the supporting frame, a first cylinder rod on the pressing cylinder, a pressing support on the first cylinder rod, a damping layer on the pressing support, a main base plate below the supporting frame, a main support and a staircase on the main base plate, a side frame and a rotary motor on the main support, a horizontal cylinder on the side frame, a second cylinder rod on the horizontal cylinder, the second cylinder rod being fixedly installed with the supporting frame, and a storage tank shell above the main base plate, with a diaphragm tube inserted inside the storage tank shell;

[0011] The rotary motor is equipped with a clamping cylinder on its motor shaft, a third cylinder rod on the clamping cylinder, and a clamping plate on the third cylinder rod.

[0012] The pressing support is provided with a rib plate, the main bracket is provided with a working opening and a horizontal opening, and the staircase is provided with a work platform.

[0013] In detail, the top view of the support frame is a U-shaped structure, and the pressing support and the pressing cylinder are a set, which are two sets symmetrically arranged front and back.

[0014] In detail, the pressing support is an elongated strip structure with a semi-arc cross-section, and the damping layer is uniformly coated along the arc-shaped outer wall of the pressing support.

[0015] In detail, the side cross-section of the clamping plate is an arc-shaped structure, and the clamping plate, the rotary motor, and the clamping cylinder are a set, consisting of two sets that are symmetrical from top to bottom.

[0016] In detail, the side frame has a longitudinal opening that extends vertically through the side frame.

[0017] In detail, the horizontal opening extends through the main support, and the side opening size of the horizontal opening is not less than the overall side size of the support frame and the pressing support.

[0018] In detail, the workbench is a rectangular groove structure, and the inner groove wall of the workbench is provided with anti-slip pads.

[0019] In detail, the support ribs are arranged in two symmetrical sets and have a triangular structure. The two ends of the support ribs are fixedly connected to the first cylinder rod and the pressing support, respectively.

[0020] The design scheme proposed in this utility model has the following beneficial effects in application:

[0021] 1. This utility model improves the pressing stability of the welded joint between the membrane-type tank shell and the cylindrical diaphragm tube on the main base plate by setting an electrically controlled lateral moving support frame on the support frame and setting a symmetrical pneumatic pressing support structure with a damping layer. First, the diaphragm tube is inserted into the tank shell on the working ground. Then, the tank shell with the inserted diaphragm tube is suspended between two clamps by a pre-set crane. Then, the two clamps are pneumatically stabilized and clamped. Next, the support frame is pneumatically moved laterally into the diaphragm tube. Then, the two symmetrical pressing supports are pneumatically pressed and supported on the inner wall of the diaphragm tube. At the same time, the damping layer also achieves a damping friction and anti-slip effect with the inner wall of the diaphragm tube. Finally, the welder holds a laser welding head on the workbench to perform laser welding on the opening welding part.

[0022] 2. This utility model greatly improves the structural stability between the first cylinder rod and the pressing support by symmetrically arranging triangular support plates between the first cylinder rod and the pressing support, thereby ensuring the structural stability of the pressing support for pressing and supporting the inner wall surface of the diaphragm cylinder.

[0023] 3. By setting up an electrically controlled axial rotation clamping structure, after the laser welding of the membrane tank shell and the cylindrical diaphragm tube at one end of the liquefied natural gas ship hull is completed, the entire tank shell and diaphragm tube can be electrically controlled to rotate horizontally by 180 degrees and stop, which facilitates the welder to perform laser welding operations on the other end of the diaphragm tube. Attached Figure Description

[0024] Figure 1 This is a first-view perspective three-dimensional schematic diagram of the overall structure of this utility model;

[0025] Figure 2 For the present utility model Figure 1 A three-dimensional schematic diagram of a support frame with pressing support components;

[0026] Figure 3 For the present utility model Figure 1 Enlarged view of section H in the middle;

[0027] Figure 4 For the present utility model Figure 2 A three-dimensional structural diagram of a pressing support member with supporting ribs;

[0028] Figure 5 This is a second-view perspective three-dimensional schematic diagram of the overall structure of this utility model;

[0029] Figure 6 This is a top view of the overall structure of this utility model.

[0030] In the diagram: 1 Support frame; 11 Pressing cylinder; 12 First cylinder rod; 121 Support rib; 2 Pressing support; 21 Damping layer; 3 Side frame; 31 Horizontal cylinder; 32 Second cylinder rod; 33 Longitudinal opening; 4 Main base plate; 41 Main support; 42 Working port; 43 Horizontal opening; 5 Staircase; 51 Workbench; 52 Anti-slip mat; 6 Tank shell; 61 Diaphragm tube; 7 Rotary motor; 71 Clamping cylinder; 711 Third cylinder rod; 72 Clamping plate. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0032] Reference Figures 1-6 A pressing support for the diaphragm welding section of a liquid storage tank includes a support frame 1, a pressing cylinder 11 on the support frame 1, a first cylinder rod 12 on the pressing cylinder 11, a pressing support 2 on the first cylinder rod 12, a damping layer 21 on the pressing support 2, a main base plate 4 below the support frame 1, a main support 41 and a staircase 5 on the main base plate 4, a side frame 3 and a rotary motor 7 on the main support 41, a horizontal cylinder 31 on the side frame 3, a second cylinder rod 32 on the horizontal cylinder 31, the second cylinder rod 32 being fixedly installed with the support frame 1, and a storage tank shell 6 above the main base plate 4, with a diaphragm tube 61 inserted inside the storage tank shell 6.

[0033] The rotary motor 7 has a clamping cylinder 71 on its motor shaft, a third cylinder rod 711 on the clamping cylinder 71, and a clamping plate 72 on the third cylinder rod 711.

[0034] The pressing support 2 is provided with a support rib plate 121, the main support 41 is provided with a working port 42 and a horizontal opening 43, the staircase 5 is provided with a workbench 51, the tank shell 6 and the diaphragm tube 61 are related structures of liquefied natural gas ship membrane type tanks, which are existing technologies. Some existing structures are not drawn and labeled, so there is no need to elaborate.

[0035] It should be further noted that the top view of the support frame 1 is a U-shaped structure, and the pressing support 2 and the pressing cylinder 11 are a set, which are two sets symmetrically arranged front and back. Both the pressing support 2 and the support frame 1 are made of No. 45 steel, which is high in strength and durable.

[0036] It should be further noted that the pressing support 2 is an overall elongated structure with a semi-arc cross-section. The damping layer 21 is uniformly coated along the arc-shaped outer wall of the pressing support 2. The damping layer 21 is a silicone rubber coating, which has excellent damping elasticity and is highly wear-resistant and durable.

[0037] It should be further noted that the side cross-section of the clamping plate 72 is an arc-shaped structure. The clamping plate 72, the rotary motor 7, and the clamping cylinder 71 are a set, and there are two sets in total that are symmetrical from top to bottom. The clamping plate 72 is made of stainless steel. The two arc-shaped clamping plates 72 can stably clamp the outer wall of the tank shell 6.

[0038] It should be further noted that the side frame 3 has a longitudinal opening 33, which vertically penetrates the side frame 3, allowing monitoring personnel standing on the main base plate 4 to observe the pressing support 2 in real time.

[0039] It should be further noted that the horizontal opening 43 extends horizontally through the main support 41, and the side opening size of the horizontal opening 43 is not less than the overall side size of the support frame 1 and the pressing support 2, which can ensure that the support frame 1 and the pressing support 2 can move horizontally to the right and pass through the horizontal opening 43, avoiding collision with the main support 41.

[0040] It should be further noted that the workbench 51 has an overall rectangular internal groove structure, which facilitates the entry of staff to perform laser welding operations.

[0041] The inner wall of the workbench 51 is provided with an anti-slip pad 52. The anti-slip pad 52 is made of polyurethane material, which has excellent damping and anti-slip properties, and is wear-resistant, corrosion-resistant and durable.

[0042] It should be further noted that the support ribs 121 are arranged in two symmetrical sets and have a triangular structure. The two ends of the support ribs 121 are fixedly connected to the first cylinder rod 12 and the pressing support respectively. The support ribs 121 are made of hard alloy steel, which has high strength and strong stability due to their triangular structure.

[0043] Working method: First, insert the diaphragm tube 61 into the tank shell 6 on the working ground. Then, suspend the entire tank shell 6 with the inserted diaphragm tube 61 between two clamping plates 72 using a pre-set crane (existing technology). Then, simultaneously activate the upper and lower clamping cylinders 71, which drive the third cylinder rod 711 to extend simultaneously, causing the upper and lower clamping plates 72 to move closer together and stably clamp the outer wall of the tank shell 6. Stop the clamping cylinders 71.

[0044] Next, the horizontal cylinder 31 is activated, causing the second cylinder rod 32 to extend to the right, which in turn moves the support frame 1 and the pressing support 2 to the right and inserts them into the diaphragm cylinder 61. The horizontal cylinder 31 is then stopped, and simultaneously the two pressing cylinders 11 are activated. The first cylinder rod 12 extends, causing the two pressing support 2 to move vertically away simultaneously. When the two pressing support 2 are simultaneously and stably pressed against the inner wall of the diaphragm cylinder 61, the damping layer 21 also achieves a damping friction and anti-slip effect with the inner wall of the diaphragm cylinder 61, improving the pressing stability of the welded joint between the membrane-type storage tank shell 6 and the cylindrical diaphragm cylinder 61 on the liquefied natural gas hull.

[0045] Finally, the welder carries a handheld laser welding machine through the work opening 42, up the stairs 5, and into the workbench 51. Using the handheld laser welding machine, the welder performs laser welding on the opening of the tank shell 6 and the cylindrical diaphragm tube 61. Later, the openings at both ends of the tank shell 6 will be sealed by welding with pre-made matching shell caps (all existing technologies).

[0046] Moreover, by symmetrically arranging triangular support plates 121 between the first cylinder rod 12 and the pressing support member 2, the structural stability between the first cylinder rod 12 and the pressing support member 2 is greatly improved, thereby ensuring the structural stability of the pressing support member 2 in pressing and supporting the inner wall surface of the diaphragm cylinder 61.

[0047] In addition, after the laser welding of the membrane-type storage tank shell 6 and the cylindrical diaphragm tube 61 at one end of the liquefied natural gas hull is completed, the pressing cylinder 11 is first started, which drives the first cylinder rod 12 to retract and reset, and then drives the pressing support 2 to move and reset. Next, the horizontal cylinder 31 is started, which drives the second cylinder rod 32 to move to the left and retract and reset, which can drive the support frame 1 and the pressing support 2 to move to the left, exit the diaphragm tube 61 and reset. Then, the upper and lower rotating motors 7 are started at the same time, which drive the storage tank shell 6 and the diaphragm tube 61 to rotate horizontally by 180 degrees and stop. This makes it convenient for the welder to perform laser welding on the opening of the storage tank shell 6 and the diaphragm tube 61 at the other end.

[0048] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pressing support for the welding part of a diaphragm in a liquid storage tank, comprising a support frame (1), characterized in that: The support frame (1) is provided with a pressing cylinder (11), the pressing cylinder (11) is provided with a first cylinder rod (12), the first cylinder rod (12) is provided with a pressing support (2), the pressing support (2) is provided with a damping layer (21), the support frame (1) is provided with a main base plate (4) below, the main base plate (4) is provided with a main support (41) and a staircase (5), the main support (41) is provided with a side frame (3) and a rotary motor (7), the side frame (3) is provided with a horizontal cylinder (31), the horizontal cylinder (31) is provided with a second cylinder rod (32), the second cylinder rod (32) is fixedly set with the support frame (1), the main base plate (4) is provided with a storage tank shell (6) above, and a diaphragm tube (61) is inserted inside the storage tank shell (6); The rotary motor (7) has a clamping cylinder (71) on its motor shaft, a third cylinder rod (711) on the clamping cylinder (71), and a clamping plate (72) on the third cylinder rod (711). The pressing support (2) is provided with a support plate (121), the main support (41) is provided with a working opening (42) and a horizontal opening (43), and the staircase (5) is provided with a workbench (51).

2. The pressing support for the welding portion of a diaphragm in a liquid storage tank according to claim 1, characterized in that: The top view of the support frame (1) is a U-shaped structure. The pressing support (2) and the pressing cylinder (11) are a set, and there are two sets in total that are symmetrical front and back.

3. The pressing support for the welding part of the diaphragm in a liquid storage tank according to claim 1, characterized in that: The pressing support (2) is an elongated strip structure with a semi-arc cross section. The damping layer (21) is uniformly coated along the arc-shaped outer wall of the pressing support (2).

4. The pressing support for the welding part of the diaphragm of a liquid storage tank according to claim 1, characterized in that: The side cross-section of the clamping plate (72) is an arc-shaped structure. The clamping plate (72), the rotary motor (7), and the clamping cylinder (71) are a set, and there are two sets in total that are symmetrical from top to bottom.

5. A pressing support for the welding portion of a diaphragm in a liquid storage tank according to claim 1, characterized in that: The side frame (3) has a longitudinal opening (33) that vertically penetrates the side frame (3).

6. A pressing support for the welding portion of a diaphragm in a liquid storage tank according to claim 1, characterized in that: The horizontal opening (43) extends horizontally through the main support (41), and the side opening size of the horizontal opening (43) is not less than the overall side size of the support frame (1) and the pressing support (2).

7. A pressing support for the welding portion of a diaphragm in a liquid storage tank according to claim 1, characterized in that: The workbench (51) is a rectangular groove structure, and the inner groove wall of the workbench (51) is provided with anti-slip pads (52).

8. A pressing support for the welding portion of a diaphragm in a liquid storage tank according to claim 1, characterized in that: The support ribs (121) are two sets arranged symmetrically and have a triangular structure. The two ends of the support ribs (121) are fixedly connected to the first cylinder rod (12) and the pressing support, respectively.

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