High-precision assembly tool for LNG ship pump tower

Abstract

According to the LNG ship pump tower high-precision assembly tool, a main pump pipe supporting cross beam is fixed to the ground through supporting columns, and main pump supports, emergency pump pipe supporting columns and supporting pipe supporting beams are sequentially arranged at the two ends of the main pump pipe supporting cross beam from outside to inside; a first arc-shaped plate is fixed to the top of the main pump support, a limiting piece is arranged on the inner side of the main pump support, and the main pump pipe is located on the main pump support. An emergency pump pipe supporting beam is transversely arranged between the upper portions of the two emergency pump pipe supporting columns, an emergency pump pipe support is fixed to the center of the emergency pump pipe supporting beam, a second arc-shaped plate is fixed to the top of the emergency pump pipe support, and an emergency pump pipe is located on the emergency pump pipe support. Supporting positioning, size adjustment, precision control and material protection of the pump tower structure can be achieved, rapid construction and manufacturing of the pump tower triangular mast structure are achieved, the construction speed of the pump tower is increased on the premise that the pump tower manufacturing requirement is met, and free disassembly and repeated use are achieved.

Description

Technical Field

[0001] The invention belongs to the field of ship construction and design, and in particular relates to a high-precision assembly tool for an LNG ship pump tower. Background Art

[0002] The pump tower of a liquefied natural gas carrier (hereinafter referred to as LNG carrier) is a very important functional component in the cargo hold area of ​​the LNG carrier. The pump tower is mainly composed of the main structure of the pump tower, the base components of the pump tower, and the dome hatch cover components. During the use of the liquefied natural gas carrier, the -163 degree low-temperature natural gas in the cargo hold is discharged out of the cabin through two main pump pipes through two main pump pipes, and the emergency pump pipe is responsible for the emergency function of handling the main pump failure. On the LNG carrier, the two main pump pipes and emergency pump pipes of the pump tower triangular mast are both structural parts and liquid cargo channels. The precision requirement of LNG ship for pump tower is: within the length of about 30 meters of pump tower pipe, the straightness of the pipe should be controlled within ±5mm, the verticality should be controlled within ±10mm, and the tolerance of mast triangle size should be controlled within ±5mm. Such high-precision manufacturing requirements have put forward higher requirements for the assembly and welding personnel of pump tower. However, due to the large differences in the dimensional tolerance of the purchased pump tower materials and the construction level of the operators, it is necessary to make a high-precision assembly tool for LNG ship pump tower and apply it to the manufacturing of pump tower to ensure that the manufactured pump tower products fully meet the quality requirements of the drawings. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a high-precision assembly tool for an LNG ship pump tower, which aims to help the installation of the pump tower so that the accuracy of the pump tower after installation meets the requirements of LNG ships. The technical solution adopted is:

[0004] A high-precision assembly tool for an LNG ship pump tower comprises a main pump pipe supporting beam, which is fixed to the ground through supporting columns, and main pump supports, emergency pump pipe supporting columns, and supporting pipe supporting beams are arranged at both ends of the main pump pipe supporting beam from outside to inside, and the main pump supports, emergency pump pipe supporting columns, and supporting pipe supporting beams are symmetrically arranged on the upper surface of the main pump pipe supporting beam; a first arc plate is fixed on the top of the main pump support, a limiting member is arranged on the inner side of the main pump support, and the main pump pipe is located on the main pump support.

[0005] The emergency pump pipe support column is arranged vertically, and an emergency pump pipe support beam is arranged horizontally in the middle of the upper part of the two emergency pump pipe support columns. An emergency pump pipe support is fixed at the center of the emergency pump pipe support beam, a second arc plate is fixed on the top of the emergency pump pipe support, and the emergency pump pipe is located on the emergency pump pipe support.

[0006] Leveling devices are provided at the bottoms of the support columns and the emergency pump pipe support columns.

[0007] Multiple assembly tools are aligned front to back, arranged in a row, and used simultaneously.

[0008] The above-mentioned high-precision assembly tooling for the LNG ship pump tower, further, the leveling device includes two leveling plates, the two leveling plates are arranged parallel to each other up and down, the four corners are connected by studs (positive thread at the top and negative thread at the bottom), and the upper leveling plate is welded to the bottom of the support column or the bottom of the emergency pump pipe support column.

[0009] The above-mentioned high-precision assembly tool for the LNG ship pump tower, further, has an arc of the first arc plate that is adapted to the outer surface of the main pump pipe.

[0010] The above-mentioned high-precision assembly tool for the LNG ship pump tower, further, has an arc of the second arc plate that is adapted to the outer surface of the emergency pump pipe.

[0011] The above-mentioned high-precision assembly tool for the LNG ship pump tower further has the support column corresponding to the position of the main pump support.

[0012] The above-mentioned high-precision assembly tool for the LNG ship pump tower further has the support column and the main pump support being arranged at 1750 mm from the center of the main pump pipe support beam.

[0013] By using this tool in the manufacture of pump towers, it is possible to achieve support positioning, size adjustment, precision control, and material protection for the pump tower structure, so as to achieve rapid construction and manufacturing of the pump tower triangular mast structure. On the premise of meeting the pump tower manufacturing requirements, the construction speed of the pump tower is improved, and free disassembly and reuse are achieved. Compared with the previous pump tower construction method, a large amount of labor costs and tooling costs can be saved, and the construction period can be shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] Among them, 1-leveling device, 2-main pump pipe support column, 3-main pump pipe support beam, 4-main pump support, 5-limiting piece, 7-support pipe support beam, 8-platform support frame, 9-emergency pump pipe support column, 10-emergency pump pipe support beam, 12-emergency pump pipe support. DETAILED DESCRIPTION

[0016] The present invention will be further described in conjunction with the accompanying drawings.

[0017] like Figure 1The high-precision assembly tool for the pump tower of an LNG ship shown in the figure has a main pump pipe support beam, which is fixed to the ground through a support column. The support column is made of 480mm long H350*350 (carbon steel) H-shaped steel, and the main pump pipe support beam is made of 4000mm long H350*350 (carbon steel) H-shaped steel. The main pump pipe support beam is provided with a main pump support, an emergency pump pipe support column, and a support beam from the outside to the inside at both ends of the main pump pipe support beam. The main pump support, the emergency pump pipe support column, and the support beam are symmetrically arranged on the upper surface of the main pump pipe support beam; a first arc plate is fixed on the top of the main pump support, and the curvature of the first arc plate matches the outer surface of the main pump pipe. A limiter is arranged on the inner side of the main pump support, and the main pump pipe is located on the main pump support. The support column corresponds to the position of the main pump support, and the support column and the main pump support are arranged at 1750mm from the center of the main pump pipe support beam.

[0018] The emergency pump pipe support column is made of 480mm long H350*350 (carbon steel) H-shaped steel. In the middle of the upper part of the two emergency pump pipe support columns, an emergency pump pipe support beam is arranged horizontally. The emergency pump pipe support crossbeam is made of 1810mm long □150*150 (carbon steel). An emergency pump pipe support is fixed in the center of the emergency pump pipe support beam. A second arc plate is fixed on the top of the emergency pump pipe support. The emergency pump pipe is located on the emergency pump pipe support. The curvature of the second arc plate matches the outer surface of the emergency pump pipe.

[0019] The bottom of the support column and the emergency pump pipe support column are both equipped with a leveling device, which includes two leveling plates, which are arranged in parallel up and down, and connected at the four corners by bolts. The leveling plate located at the top is welded to the bottom of the support column or the bottom of the emergency pump pipe support column. The size of the leveling plate at the bottom of the support column is 20*450*450mm, and the size of the leveling plate at the bottom of the emergency pump pipe support column is 20*300*300mm.

[0020] The specific usage is as follows:

[0021] S1: Assemble in the workshop, the flatness of the workshop floor shall not exceed 10mm / 30m, 6 sets of assembly tools shall be arranged in a row, the centers of the 6 sets of assembly tools shall be aligned, and the deviation shall not exceed 1mm. By adjusting the bottom leveling device, the straightness of the contact between the 6 sets of assembly tools and the main pump pipe shall not exceed 1mm / 30m, and the flatness shall not exceed 1mm.

[0022] S2: Hoist the two welded (passed inspection) main pump pipes onto the supporting fixture, use a laser theodolite to detect the assembly position data and make fine adjustments to make the center line of the branch pipes on the two main pump pipes parallel to the plane of the assembly platform with a parallelism of no more than 1mm. Ensure that the two parallel main pump pipes are horizontally aligned with a deviation of no more than 1mm, and fix them. Measure and mark the center lines of the two main pump pipes with a laser theodolite and make them consistent with the center line of the assembly platform, then fix the two main pump pipes and install the limiters.

[0023] S3: Draw the installation position line of the support pipe on the two main pump pipes according to the center position of the plane support pipe row; then install the flat support pipe support beam 7, and measure the size on the tooling to confirm that it is consistent with the installation position line of the two main pipes; use full-position argon arc welding to perform support pipe assembly positioning welding from the middle to both ends, and after positioning welding, confirm the position size of the two main pump pipes, and then perform support pipe filling welding from the middle to both ends. During the welding process, check the position size of the two main pump pipes at any time. If it is within the accuracy range, welding can be continued. If there is any deviation, hydraulic support rods or manual hoists can be used for adjustment. After it is controlled within the accuracy range, welding can be continued.

[0024] S4: Install 6 emergency pump pipe support fixtures onto 6 main pump pipe support fixtures, adjust the emergency pump pipe support leveling device 1, and check that the straightness of the contact between the emergency pump pipe support fixture and the emergency pump pipe is no more than 1mm / 30m and the flatness is no more than 1mm. Then, hoist the emergency pump pipe onto the emergency pump pipe support fixture, and use chalk line to draw the center line to make it coincide with the center line of the support. Continuously adjust the center line of the emergency pump pipe and the center line of the flange at the end of the emergency pump pipe to coincide with the center line of the support, and ensure that it remains consistent during the installation of the supporting straight pipe.

[0025] S5: Lift the inclined support straight pipe to the installation positions on both sides of the main pump pipe, install the inclined support pipe according to the marked position, and install it symmetrically on both sides of the first main pump pipe and the second main pump pipe to ensure that the center line of the emergency pump pipe is always consistent with the center line of the tire frame. Follow this method in sequence until all the inclined support straight pipes are spot welded and fixed. During the installation of the support pipe, measure the position dimensions of the three main pipes at any time. If there is any deviation, use hydraulic struts or manual hoists to adjust it. Use a laser instrument to make each positioning point parallel to the pump pipe axis, and the parallelism of the left and right sides is completed by a total station.

[0026] S6: Install the platform support frame 8 and the safety enclosure onto the inclined support straight pipe, and use full-position argon arc welding to fill the inclined support pipe from the middle to both ends; during the welding process, check the position and size of the two main pump pipes and the emergency pump pipe at any time. Welding can continue within the accuracy range. If there is any deviation, use hydraulic support rods or manual hoists to adjust it. Continue welding after it is controlled within the accuracy range.

[0027] S7: After all parts are welded, non-destructive testing is carried out, and the pump tower triangular mast is inspected by total station. The straightness of the pipe should be controlled within ±5mm, the verticality should be controlled within ±10mm, and the triangular dimension tolerance of the mast should be controlled within ±5mm. After passing the inspection, the emergency pump pipe support tooling, pipe support beam, and platform support frame are disassembled in sequence.

Claims

1. A high-precision assembly tool for LNG ship pump tower, characterized in that: The invention comprises a main pump pipe support crossbeam (3), which is fixed on the ground through a support column (2), and the two ends of the main pump pipe support crossbeam are provided with a main pump support (4), an emergency pump pipe support column (9), and a support pipe support beam (7) in sequence from the outside to the inside, and the main pump support, the emergency pump pipe support column, and the support pipe support beam are symmetrically arranged on the upper surface of the main pump pipe support crossbeam; a first arc-shaped plate is fixed on the top of the main pump support, a limiting member (5) is arranged on the inner side of the main pump support, and the main pump pipe is located on the main pump support; The emergency pump pipe support column is arranged vertically, and an emergency pump pipe support beam (10) is arranged horizontally in the middle of the upper parts of the two emergency pump pipe support columns, an emergency pump pipe support (12) is fixed at the center of the emergency pump pipe support beam, a second arc plate is fixed on the top of the emergency pump pipe support, and the emergency pump pipe is located on the emergency pump pipe support; The bottoms of the support column and the emergency pump pipe support column are both provided with a leveling device (1); Multiple assembly tools are aligned front to back, arranged in a row, and used simultaneously.

2. The high-precision assembly tool for LNG ship pump tower according to claim 1 is characterized in that: The leveling device includes two leveling plates, which are arranged parallel to each other up and down. The four corners are connected by studs, upper positive threads and lower negative threads. The upper leveling plate is welded to the bottom of the support column or the bottom of the emergency pump pipe support column.

3. The high-precision assembly tool for LNG ship pump tower according to claim 1 is characterized in that: The curvature of the first curved plate is matched with the outer surface of the main pump pipe.

4. The high-precision assembly tool for LNG ship pump tower according to claim 1, characterized in that: The curvature of the second curved plate is matched with the outer surface of the emergency pump pipe.

5. The high-precision assembly tool for LNG ship pump tower according to claim 1, characterized in that: The support column corresponds to the position of the main pump support.

6. The high-precision assembly tool for LNG ship pump tower according to claim 5, characterized in that: The support column and main pump support are set at 1750mm away from the center of the main pump pipe support beam.

Images