A method for positioning and installing a fuel tank radar tube bracket

Abstract

This invention relates to a method for positioning and installing radar tube supports in a fuel tank, comprising: 1. Installing a pump tower and a dome, with a radar tube installed on the dome cover on one side of the pump tower pipe; 2. Installing a plumb line, a radar reflector, and a target; 3. Adjusting the position of the plumb line with the radar reflector as a reference; 4. Adjusting the angle of the plumb line so that the upward beam of the plumb line is aligned with the target's center while ensuring that the downward beam of the plumb line illuminates the center of the radar reflector, and fixing the position of the plumb line after adjustment; 5. Adjusting the position of the radar tube support so that the upward beam of the plumb line passes through the light-transmitting hole of the positioning device from below, fixing the radar tube support to one side of the pump tower pipe; 6. Using the installed radar tube support as a reference, installing adjacent radar tube supports according to step 3; 7. Repeating steps 5-6 to install all radar tube supports. This invention solves the problem of high difficulty and low accuracy in positioning multiple radar tube supports in the vertical direction, avoiding rework.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding, and specifically to a method for positioning and installing a fuel tank radar tube bracket. Background Technology

[0002] During the shipbuilding process, the construction cycle for dual fuel tanks is relatively long. Due to the characteristics of construction inside the fuel tanks, there is little time left for the hoisting of the pump tower and dome during dock construction. The pump tower and dome are usually hoisted four or five days before leaving the dock. The radar tube support needs to be installed after the pump tower and dome are hoisted and installed, so the time left for the installation of the radar tube support is relatively even less.

[0003] The interior height of a typical cabin can reach 28 meters. Within this 28-meter-high space, approximately 25 radar tube supports need to be installed. These supports are distributed vertically along the height of the pump tower pipe, with a height spacing of about 1 meter between them. It is necessary to ensure that all radar tube supports are vertically aligned. As the installation height of the radar tube supports increases, the positional deviation of the radar tube supports will be amplified. Ultimately, this may result in a large vertical deviation of the radar tube supports after installation, requiring rework and reinstallation, which will seriously affect the ship's launch from the dry dock. Summary of the Invention

[0004] To improve the installation accuracy and efficiency of radar tube supports, this invention provides a method for positioning and installing radar tube supports in fuel tanks. This method ensures the accuracy of radar tube support positioning and installation, and reduces rework.

[0005] The technical objective of this invention is achieved through the following technical solution:

[0006] A method for positioning and installing a fuel tank radar tube bracket, the method comprising the following steps:

[0007] Step 1: Install the pump tower and dome. The pump tower includes a pump tower base and a pump tower pipe. The dome includes a dome cover. The pump tower pipe is installed at the bottom of the fuel tank through the pump tower base. The pump tower pipe extends upward and passes through the dome cover above the fuel tank. A radar tube is installed at the dome cover on one side of the pump tower pipe. The radar tube passes through the dome cover.

[0008] Step 2: After the pump tower and dome are installed, install a plumb line and radar reflector on one side of the pump tower base. Set a target at the center of the radar tube at the dome cover. Install the radar reflector on the bottom of the fuel tank below the plumb line, with the radar reflector 50-150mm below the plumb line.

[0009] Step 3: Point the plumb line upwards and downwards, and adjust the position of the plumb line so that the plumb line shines downwards and illuminates the center of the radar reflector.

[0010] Step 4: Point the plumb line upwards and adjust its angle so that the upward beam is aligned with the center of the target. At the same time, ensure that the downward beam illuminates the center of the radar reflector. After adjustment, fix the position of the plumb line. Fixing it means not adjusting or changing its position again.

[0011] Step 5: The radar tube support includes a radar tube sleeve and a connecting component connected to the outside of the radar tube sleeve; a positioning device is installed inside the radar tube sleeve, and the positioning device has a light-transmitting hole corresponding to the center of the radar tube sleeve; the position of the radar tube support is adjusted so that when the plumb bob shines light upward, the light passes through the light-transmitting hole from below; the radar tube support is connected and fixed to the outside of the pump tower tube above the pump tower base through the connecting component.

[0012] Step 6: Using the installed radar tube bracket as a reference, move it vertically to the set height and install the adjacent radar tube bracket according to the method in Step 3.

[0013] Step 7: Repeat steps 5-6 until all radar tube brackets are installed.

[0014] Furthermore, a plumb bob base is installed on one side of the pump tower base. The plumb bob base includes a support base plate and a connecting plate that is perpendicularly connected to one side of the support base plate. A connecting hole is provided at the center of the connecting plate, and a bolt with a nut is inserted into the connecting hole. The connecting plate is connected to the side of the pump tower base through the bolt and the nut. The plumb bob is placed on the support base plate, and the support base plate has an opening for the plumb bob to shine light downwards through.

[0015] Furthermore, when installing the radar reflector, the pump tower base is used as a reference to measure and determine the position of the radar reflector, and the center position of the radar reflector corresponds to the center position of the target; after the plumb line shines downward through the supporting base plate, the position of the plumb line is adjusted so that the plumb line shines downward and aligns with the center of the radar reflector.

[0016] Furthermore, after the position of the plumb line is adjusted, rotate the plumb line base relative to the pump tower base along the bolt position so that the plumb line shines upward through the target's center position, while ensuring that the plumb line shines downward onto the center of the radar reflector. After adjustment, tighten the bolts and nuts.

[0017] Furthermore, the positioning device includes a main body that adapts to the inner wall of the radar tube sleeve. A limiting protrusion is provided on the upper edge of the main body. The light-transmitting hole is located at the center of the main body and penetrates through the main body. The main body of the positioning device is inserted into the radar tube sleeve, and the radar tube support is adjusted to ensure that the light from the plumb bob passes through the center of the light-transmitting hole.

[0018] Furthermore, a flange is installed at the upper end of the radar tube at the dome cover, and the target is placed inside the flange. The flange is welded and fixed to the upper end of the radar tube.

[0019] Furthermore, the pump tower base and the bottom of the fuel tank are connected by stainless steel argon arc welding, and the pump tower pipe and the dome cover, as well as the dome cover and the radar tube, are also connected by stainless steel argon arc welding.

[0020] Furthermore, the radar tube brackets are installed sequentially from top to bottom or from bottom to top.

[0021] Furthermore, the spacing between adjacent radar tube supports is 0.8-1.2m.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This invention uses the pump tower base as a reference to determine the position of the radar reflector at the bottom of the fuel tank, then uses the radar reflector as a reference to determine the position of the plumb line instrument, and finally uses the radar reflector and the target at the dome to determine the angle of the plumb line instrument. The radar tube support is positioned one by one by the light from the plumb line instrument, which solves the problem of high difficulty and low accuracy in positioning several radar tube supports in the height direction.

[0024] 2. Since the levelness inside the ship is difficult to control, the method of the present invention no longer relies on leveling adjustment. Instead, the angle is adjusted by the base of the plumb line, and the levelness of the radar tube bracket is ensured by the light shining through the light-transmitting hole inside the radar tube sleeve of the plumb line. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the positioning and installation of the fuel tank radar tube support of the present invention.

[0026] Figure 2 This is a schematic diagram of the installation of the positioning device in this invention.

[0027] Figure 3 This is a schematic diagram of the base structure of the plumb line instrument in this invention.

[0028] In the diagram, 1. Dome cover; 2. Radar tube; 3. Pump tower tube; 4. Flange; 5. Pump tower base; 6. Plumb bob base; 7. Plumb bob; 8. Radar reflector; 9. Radar tube support; 10. Bolt; 11. Nut; 12. Target; 13. Fuel tank bottom; 14. Radar tube sleeve; 15. Connecting component; 16. Positioning device; 17. Light-transmitting hole; 18. Support base plate; 19. Connecting plate; 20. Limiting protrusion. Detailed Implementation

[0029] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0030] A method for positioning and installing a fuel tank radar tube bracket, such as Figure 1 As shown, the method includes the following steps:

[0031] Step 1: Install the pump tower and dome. The pump tower includes a pump tower base 5 and a pump tower pipe 3. The dome includes a dome cover 1. The pump tower pipe 3 is installed on the bottom of the fuel tank 13 through the pump tower base 5. The pump tower base 5 and the bottom of the fuel tank 13 are connected by stainless steel argon arc welding. The pump tower pipe 3 extends upward and passes through the dome cover 1 above the fuel tank. The pump tower pipe 3 and the dome cover 1 are also connected by stainless steel argon arc welding. A radar tube 2 is installed on one side of the dome cover 1. The radar tube 2 passes through the dome cover 1. The dome cover 1 and the radar tube 2 are also connected by stainless steel argon arc welding.

[0032] Step 2: After the pump tower and dome are installed, install the plumb bob 7 and radar reflector 8 on one side of the pump tower base 5. Set the target 12 at the center position inside the radar tube 2 at the dome cover 1. Specifically, the radar reflector 8 is installed on the bottom 13 of the fuel tank below the plumb bob 7, and the radar reflector 8 is 50-150mm below the plumb bob 7. A flange 4 is also installed at the upper end of the radar tube 2 at the dome cover. Place the target 12 inside the flange 4. The flange 4 is welded and fixed to the upper end of the radar tube 2. The flange is like a high-leg flange.

[0033] The positions of the radar tube 2 at the dome cover and the pump tower base 5 at the bottom of the fuel tank are determined by a total station during construction. When installing the radar reflector 8, the pump tower base is used as a reference, and the position of the radar reflector 8 is determined by measuring from the pump tower base 5. The center position of the radar reflector corresponds to the center position of the target.

[0034] When installing the plumb bob 7, a plumb bob base 6 is installed on one side of the pump tower base 5 to facilitate the adjustment of the plumb bob 7. The plumb bob base 6 includes a support base plate 18 and a connecting plate 19 that is perpendicularly connected to one side of the support base plate 18. A connecting hole is provided at the center line of the connecting plate 19, and a bolt 10 is inserted into the connecting hole. The bolt 10 is equipped with a nut 11. The connecting plate 19 is connected to the side of the pump tower base 5 through the bolt 10 and the nut 11. The plumb bob 7 is placed on the support base plate 18, and the support base plate 18 is provided with an opening for the plumb bob 7 to shine light downwards through.

[0035] After the plumb line 7 shines downward through the supporting base plate 18, adjust the position of the plumb line 7 so that the downward shining light is aligned with the center of the radar reflector plate 8.

[0036] Since the vertical alignment instrument is only 50-150mm away from the radar reflector, while the distance between the vertical alignment instrument and the target is nearly 28m, even a small adjustment to the vertical alignment instrument 7 will result in a significant change in the light hitting the target 12. Therefore, the angle of the vertical alignment instrument 7 needs to be adjusted. After the position of the vertical alignment instrument 7 is adjusted, the vertical alignment instrument base 6 is rotated relative to the pump tower base 5 along the bolt position so that the vertical alignment instrument 7 shines upward through the center of the target 12, while ensuring that the vertical alignment instrument 7 shines downward onto the center of the radar reflector 8. After the adjustment is completed, the bolts 10 and nuts 11 are tightened. The vertical alignment instrument 7 will not be adjusted again when installing the radar tube bracket 9.

[0037] Step 3: The plumb line 7 shines light upwards and downwards, and the position of the plumb line 7 is adjusted so that the light shines downwards onto the center of the radar reflector 8.

[0038] Step 4: The vertical alignment instrument 7 shines upwards, and the angle of the vertical alignment instrument 7 is adjusted so that the upward shining of the vertical alignment instrument 7 is aligned with the center of the target 12. At the same time, the downward shining of the vertical alignment instrument 7 is ensured to illuminate the center of the radar reflector plate 8. After the adjustment is completed, the position of the vertical alignment instrument 7 is fixed.

[0039] Step 5: The radar tube support 9 includes a radar tube sleeve 14 and a connecting component 15 connected to the outside of the radar tube sleeve 14. A positioning device 16 is installed inside the radar tube sleeve 14. The positioning device 16 includes a main body adapted to the inner wall of the radar tube sleeve 14. A limiting protrusion 20 is provided on the upper edge of the main body. A light-transmitting hole 17 is set at the center of the main body and penetrates through the main body. The main body of the positioning device 16 is inserted into the radar tube sleeve 14. After measuring the set height position, the radar tube support 9 is adjusted to ensure that the light from the plumb bob 7 passes through the center of the light-transmitting hole 17. Then, the radar tube support 9 is welded and fixed to the outside of the pump tower pipe 3 above the pump tower base 5 through the connecting component 15, such as a rectangular stainless steel plate.

[0040] Step 6: Using the installed radar tube bracket 9 as a reference, move it vertically to a set height and install the adjacent radar tube bracket 9 according to the method described in Step 3. The distance between the adjacent radar tube brackets is 0.8-1.2m. In this embodiment, all radar tube brackets are equidistant from each other with a spacing of 1m.

[0041] Step 7: Repeat steps 5-6 until all radar tube brackets 9 are installed. During the installation of radar tube brackets 9, scaffolding, ladders and other auxiliary climbing equipment are required.

[0042] When installing the radar tube supports, they should be positioned and installed sequentially from top to bottom or from bottom to top. Taking the bottom-up installation as an example, the height of the bottom radar tube support 9 is measured from the bottom of the fuel tank upwards along the pump tower pipe. After the bottom radar tube support 9 is adjusted, it is welded and fixed to the outside of the pump tower pipe using connecting components. Then, using the bottom radar tube support 9 as a reference, a height of 1 meter is measured as the installation height of the second radar tube support 9, and so on, measuring 1 meter as the installation height of the third radar tube support 9, and so on, to complete the installation of all radar tube supports 9.

[0043] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for positioning and installing a fuel tank radar tube bracket, characterized in that, The method includes the following steps: Step 1: Install the pump tower and dome. The pump tower includes a pump tower base and a pump tower pipe. The dome includes a dome cover. The pump tower pipe is installed at the bottom of the fuel tank through the pump tower base. The pump tower pipe extends upward through the dome cover above the fuel tank. A radar tube is installed at the dome cover on one side of the pump tower pipe. The radar tube passes through the dome cover. Step 2: After the pump tower and dome are installed, install a plumb line and radar reflector on one side of the pump tower base. Set a target at the center of the radar tube at the dome cover. Install the radar reflector on the bottom of the fuel tank below the plumb line, 50-150mm below the plumb line. When installing the radar reflector, use the pump tower base as a reference to measure and determine the position of the radar reflector. The center of the radar reflector should correspond to the center of the target. Step 3: Point the plumb line upwards and downwards, and adjust the position of the plumb line so that the plumb line shines downwards and illuminates the center of the radar reflector. Step 4: Point the plumb line upwards and adjust its angle so that the upward beam is aligned with the center of the target. At the same time, ensure that the downward beam illuminates the center of the radar reflector. After adjustment, fix the position of the plumb line. Step 5: The radar tube support includes a radar tube sleeve and a connecting component connected to the outside of the radar tube sleeve; a positioning device is installed inside the radar tube sleeve, and the positioning device has a light-transmitting hole corresponding to the center of the radar tube sleeve. The position of the radar tube support is adjusted so that when the plumb bob shines light upward, the light passes through the light-transmitting hole from below; the radar tube support is connected and fixed to the outside of the pump tower tube above the pump tower base through the connecting component. Step 6: Using the installed radar tube bracket as a reference, move it vertically to a set height and install the adjacent radar tube bracket according to the method described in Step 5. Step 7: Repeat steps 5-6 until all radar tube brackets are installed.

2. The method for positioning and installing a fuel tank radar tube support according to claim 1, characterized in that, A plumb bob base is installed on one side of the pump tower base. The plumb bob base includes a supporting base plate and a connecting plate that is perpendicularly connected to one side of the supporting base plate. A connecting hole is provided at the center of the connecting plate, and a bolt with a nut is inserted through the connecting hole. The connecting plate is connected to the side of the pump tower base by the bolt and the nut. The plumb bob is placed on the supporting base plate, which has an opening for the plumb bob to shine light downwards through.

3. The method for positioning and installing a fuel tank radar tube support according to claim 2, characterized in that, After the plumb line shines downwards through the supporting base plate, adjust the position of the plumb line so that it shines downwards and aligns with the center of the radar reflector.

4. The method for positioning and installing a fuel tank radar tube support according to claim 3, characterized in that, After the position of the plumb line is adjusted, rotate the plumb line base relative to the pump tower base along the bolt position so that the plumb line shines upward through the target's center, while ensuring that the plumb line shines downward onto the center of the radar reflector. After adjustment, tighten the bolts and nuts.

5. The method for positioning and installing a fuel tank radar tube support according to claim 1, characterized in that, The positioning device includes a main body adapted to the inner wall of the radar tube sleeve. A limiting protrusion is provided on the upper edge of the main body. The light-transmitting hole is located at the center of the main body and penetrates the main body. The main body of the positioning device is inserted into the radar tube sleeve, and the radar tube support is adjusted to ensure that the light from the plumb bob passes through the center of the light-transmitting hole.

6. The method for positioning and installing a fuel tank radar tube support according to claim 1, characterized in that, A flange is also installed at the upper end of the radar tube at the dome cover, and the target is placed inside the flange. The flange is welded and fixed to the upper end of the radar tube.

7. The method for positioning and installing a fuel tank radar tube support according to claim 1, characterized in that, The pump tower base and the bottom of the fuel tank are connected by stainless steel argon arc welding, and the pump tower pipe and the dome cover, as well as the dome cover and the radar tube, are also connected by stainless steel argon arc welding.

8. The method for positioning and installing a fuel tank radar tube bracket according to claim 1, characterized in that, The radar tube bracket is installed sequentially from top to bottom or bottom to top.

9. The method for positioning and installing a fuel tank radar tube support according to claim 1, characterized in that, The spacing between adjacent radar tube supports is 0.8-1.2m.

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