A method for correcting the deformation of a ship helicopter landing grid

Abstract

The present application relates to a kind of rectification methods for the deformation of warship helicopter landing grid, comprising: 1, the measured subsidence of warship helicopter landing grid is measured in situ, the difference between the design subsidence and the measured subsidence is calculated, and the difference is used as the processing amount needed to sink;2, the lowest drain hole of warship helicopter landing grid is taken as the center to draw a bisecting line, and the bisecting line extends to the edge of warship helicopter landing grid along the drain hole;3, along the bisecting line, the warship helicopter landing grid is pressed down at equal depth, and the pressing depth is less than the processing amount needed to sink;4, after completing a circle of pressing down, the subsidence of warship helicopter landing grid is measured, if the subsidence meets the design subsidence requirement, the correction is completed;If the subsidence does not meet the design subsidence requirement, repeat steps 3-4.The present application avoids the problems of excessive concentration, omission and stress mutation in the pressing process by drawing the bisecting line and pressing each bisecting line, and is suitable for field operation.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding, and more specifically to a method for correcting deformation of ship helicopter landing grilles. Background Technology

[0002] When shipborne helicopters land, they need to land precisely within the landing grille, making the manufacturing and installation precision of the landing grille base particularly important. According to design requirements, the bottom plane of the landing grille base should have an eccentric, smooth concave 50mm. However, due to the special nature of its structure, welding shrinkage, and inadequate machining of the original profile, occasionally after dock installation, actual measurements show a concavity of only 10mm. This results in the base failing to meet design requirements, and such situations generally require correction or structural modification.

[0003] Field straightening typically employs a water-fire straightening method. This method involves heating the steel plate to the required temperature using a heating gun and then cooling it, causing the steel plate to shrink and achieve flatness. However, the purpose of straightening deformed ship helicopter landing grates is to cause the steel plate to concave and elongate, rather than shrink. Therefore, the water-fire straightening process is not suitable for addressing deformed ship helicopter landing grates in the field. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for correcting deformation of ship helicopter landing grilles. The method involves cold-working the ship helicopter landing grilles to ensure that the machining accuracy of the ship helicopter landing grilles meets the requirements.

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

[0006] A method for correcting deformation of shipborne helicopter landing grilles, the method comprising:

[0007] Step 1: Measure the actual sinking of the ship's helicopter landing grid on site, calculate the difference between the designed sinking and the actual sinking, and use the difference as the amount of processing required for sinking;

[0008] Step 2: Draw a bisector with the lowest drainage hole of the ship's helicopter landing grid as the center, and extend the bisector along the drainage hole to the edge of the ship's helicopter landing grid.

[0009] Step 3: Press down the ship's helicopter landing grille around the bisector line at an equal depth, with the pressing depth being less than the amount of machining required to sink it.

[0010] Step 4: After pressing down one full circle, measure the amount of sinking of the ship's helicopter landing grid. If the amount of sinking meets the design sinking requirement, the correction is complete; if the amount of sinking does not meet the design sinking requirement, repeat steps 3-4.

[0011] Furthermore, when pressing down the dividing lines, press down one line at a time, pressing down at the position of each dividing line along its length.

[0012] Furthermore, the pressure is released only after each press and the object comes to a standstill.

[0013] Furthermore, during the downward press, a correction device is used. This correction device includes a limiting device, a crossbar, a telescopic unit, and a pressing component. The crossbar is mounted above the ship's helicopter landing grille. The two ends of the crossbar are limited by the limiting device. The telescopic unit is supported between the crossbar and the pressing component. Both the telescopic unit and the pressing component are located below the crossbar. During the downward press, the telescopic unit extends, causing the pressing component to press down on the bisectors of the ship's helicopter landing grille.

[0014] Furthermore, the pressing component includes a pressing head plate and a connecting seat. The pressing head plate and the connecting seat are hinged together. The connecting seat has a socket corresponding to the telescopic unit. The end of the telescopic unit near the pressing component is inserted into the socket.

[0015] Furthermore, the pressure plate includes a flat bottom edge and inclined edges adjacent to both sides of the flat bottom edge. A pin is provided at the intersection of the two inclined edges, and the pressure plate is hinged to the connecting seat through the pin. When pressing down, the flat bottom plate is aligned with the bisectors and then pressed down.

[0016] Furthermore, the time to remain still after each press is 3-10 minutes, and the press is released after the stillness is reached.

[0017] Furthermore, in step 2, the number of dividing lines is at least 24. The more dividing lines there are, the higher the accuracy and quality of the correction, and the smoother the processed surface.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The correction method of this invention uses the marking of equal lines and cold working to press down each equal line individually, avoiding problems such as excessive pressure concentration, missed pressure, and stress abrupt changes caused by these problems during the pressing process. In addition, general cold working requires equipment such as hydraulic presses, three-star rollers, and bending machines to process and correct steel plates. These devices are generally used in indoor operations and are not suitable for outdoor processing. However, the method of this application can achieve cold working without the need for these devices and is suitable for outdoor operations. Attached Figure Description

[0020] Figure 1 This is a top view of the ship helicopter landing grille in this invention.

[0021] Figure 2 yes Figure 1 A schematic diagram of the measurement of the downward sinking of A.

[0022] Figure 3 This is a schematic diagram of the correction device structure in this invention.

[0023] Figure 4 This is a schematic diagram of the dividing line system of this invention.

[0024] Figure 5 This is a top view of the correction device in this invention.

[0025] Figure 6 yes Figure 5 A-direction view of the corrective device setup.

[0026] In the diagram, 1. Drain hole; 2. Bolt hole; 3. Steel pipe; 4. Base; 5. Support plate; 6. Pin; 7. Pressure head plate; 8. Flat bottom edge; 9. Bevel; 10. Dividing line; 11. Limiting device; 12. Crossbar; 13. Hydraulic oil pump; 14. Hydraulic head. Detailed Implementation

[0027] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0028] A method for correcting deformation of shipborne helicopter landing grilles, the method comprising:

[0029] Step 1: Measure the actual sinking of the ship's helicopter landing grille on-site, calculate the difference between the designed sinking and the measured sinking, and use this difference as the required machining allowance for sinking; the structure of the ship's helicopter landing grille is as follows: Figure 1 As shown, a number of bolt holes 2 are evenly distributed around the edge of the ship's helicopter landing grille; in this embodiment, 48 bolt holes are provided. The ship's helicopter landing grille is provided with drainage holes 1, which are located at the lowest point of the ship's helicopter landing grille. The subsidence is as follows: Figure 2 As shown, the height of the drainage hole 1 relative to the edge of the ship's helicopter landing grille is the amount of subsidence.

[0030] Step 2: Draw a bisector 10 with the drain hole 1 as the center, such as... Figure 4 As shown, the included angles between the bisectors 10 are the same, and the bisectors 10 extend along the drainage hole 1 to the edge of the ship's helicopter landing grille; preferably, the bisectors 10 include at least 24 lines. The more bisectors there are, the higher the accuracy after pressing down. In this embodiment, when drawing the bisectors, the drainage hole 1 is used as a circle, and lines are drawn and marked between the drainage hole 1 and the bolt hole 2. A line is drawn every other bolt hole to draw 24 lines as bisectors.

[0031] Step 3: Press down the ship's helicopter landing grille around the bisectors at equal depths of 10mm. The pressing depth should be less than the required reduction amount. For example, if an additional 30mm reduction is needed, this reduction can be divided into three levels, each pressing down 10mm. When pressing down the bisectors, press down one line at a time. The lengths of the bisectors are not exactly the same, and each bisector must be pressed down along its length. After each pressing down, allow the area to stand still before releasing the pressing state. Preferably, the resting time after each pressing down is 3-10 minutes. In this embodiment, the area is allowed to rest for 5 minutes after each pressing down before the pressing is removed.

[0032] In this embodiment, a corrective device is used during the downward pressing. This corrective device includes a limiting device, a crossbar 12, a telescopic unit, and a pressing component, such as... Figure 3 , 5 As shown in Figure 6, the horizontal bar 12 is mounted above the ship's helicopter landing grille. Both ends of the horizontal bar 12 are limited by limiting devices 11. A telescopic unit is supported between the horizontal bar 12 and the pressing component. Both the telescopic unit and the pressing component are located below the horizontal bar. When pressed down, the telescopic unit extends, causing the pressing component to press down on the bisector of the ship's helicopter landing grille. The pressing component includes a pressing head plate 7 and a connecting seat. The pressing head plate 7 and the connecting seat are hinged together. The connecting seat has a socket corresponding to the telescopic unit, and the end of the telescopic unit near the pressing component is inserted into the socket. The pressing head plate includes a straight bottom edge 8 and inclined edges 9 adjacent to both sides of the straight bottom edge 8. A pin 6 is located at the intersection of the two inclined edges 9. The pressing head plate 7 is hinged to the connecting seat via the pin 6. When pressed down, the straight bottom plate 8 aligns with the bisector 10 and then presses down.

[0033] In this embodiment, the telescopic unit, such as the hydraulic head 14 of the hydraulic oil pump 13, can also be a cylinder, linear motor, etc. The connecting seat is welded from a steel pipe 3 and a base 4. The base 4 is welded to one end of the steel pipe 3, and the other end of the steel pipe 3 forms an insertion hole. Two support plates 5 are welded to the lower end of the base 4. There is a gap between the two support plates 5. The pressure plate 7 can be inserted between the two support plates 5. The pressure plate 7 and the support plate 5 are hinged together by a pin 6 passing through the support plate 5 and the pressure plate 7.

[0034] The crossbar 12 is like an I-beam. The limiting device 11 is made by welding a column at each end of the I-beam. The I-beam is installed on the side of the ship's helicopter landing grille through the columns. The limiting device forms a gate-shaped structure and limits the crossbar 12 from both ends.

[0035] Step 4: After pressing down one full circle, measure the amount of sinking of the ship's helicopter landing grid. If the amount of sinking meets the design sinking requirement, the correction is complete; if the amount of sinking does not meet the design sinking requirement, repeat steps 3-4.

[0036] 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 as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A method for correcting deformation of shipborne helicopter landing grilles, characterized in that, The method includes: Step 1: Measure the actual sinking of the ship's helicopter landing grid on site, calculate the difference between the designed sinking and the actual sinking, and use the difference as the amount of processing required for sinking; Step 2: Draw a bisector with the lowest drainage hole of the ship's helicopter landing grid as the center, and extend the bisector along the drainage hole to the edge of the ship's helicopter landing grid. Step 3: Press down the ship's helicopter landing grille around the bisector line at an equal depth, with the pressing depth being less than the amount of machining required to sink it. Step 4: After pressing down one full circle, measure the sinking amount of the ship's helicopter landing grid. If the sinking amount meets the design sinking amount requirement, the correction is complete; if the sinking amount does not meet the design sinking amount requirement, repeat steps 3-4. When pressing down the dividing lines, press down one line at a time, pressing down at the position of each dividing line along its length; After each press, bring the pressure to a standstill before releasing the press. When pressing down, a corrective device is used. This corrective device includes a limiting device, a crossbar, a telescopic unit, and a pressing component. The crossbar is mounted above the ship's helicopter landing grille. The two ends of the crossbar are limited by the limiting device. The telescopic unit is supported between the crossbar and the pressing component. Both the telescopic unit and the pressing component are located below the crossbar. When pressing down, the telescopic unit extends, causing the pressing component to press down on the bisector of the ship's helicopter landing grille. The pressing component includes a pressing head plate and a connecting seat. The pressing head plate and the connecting seat are hinged together. The connecting seat is provided with a socket corresponding to the telescopic unit. The end of the telescopic unit near the pressing component is inserted into the socket. In step 2, the dividing lines include at least 24 lines.

2. The method for correcting deformation of a shipborne helicopter landing grille according to claim 1, characterized in that, The pressure plate includes a flat bottom edge and inclined edges adjacent to both sides of the flat bottom edge. A pin is provided at the intersection of the two inclined edges, and the pressure plate is hinged to the connecting seat through the pin. When pressing down, the flat bottom plate is aligned with the bisectors and then pressed down.

3. The method for correcting deformation of a shipborne helicopter landing grille according to claim 1, characterized in that, After each press, remain still for 3-10 minutes before releasing the press.

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