Self-adapting expansion positioning mechanism for aircraft barrel segment assembly positioning

Abstract

The application discloses a kind of self-adapting expansion positioning mechanism for aircraft barrel segment assembly positioning, including positioning pin, positioning pin lower part is inserted in shell, positioning pin is formed ratchet mechanism by screw nut, supporting plate, lifting handle, push piece, push groove, positioning pin upper part is formed expansion positioning structure by mandrel, taper column, expansion sleeve, nut, positioning handle, top cover, ratchet mechanism is lifted by mechanical transmission, drive upper expansion positioning mechanism to reach theoretical position, and expansion positioning operation is carried out by operating positioning handle.The characteristics of the application are: convenient operation, realize the quick positioning and separation of positioning mechanism, improve the product production quality, reduce the scrap rate, improve the production rhythm efficiency, provide strong support for the rapid production of aircraft products.

Description

Technical Field

[0001] This invention relates to the field of aircraft assembly technology, and more specifically to an adaptive expansion positioning mechanism for positioning aircraft barrel sections during assembly. Background Technology

[0002] With the continuous upgrading and replacement of aircraft products, product performance is constantly improving, which leads to increasingly higher requirements for assembly standards. During aircraft flight, the structural strength and aerodynamic shape are key performance indicators affecting aircraft performance. However, during the assembly process, due to the continuous accumulation of errors in the assembly of parts, and the large size of the aircraft itself, large barrel sections often encounter situations where key positioning holes cannot be smoothly placed into the positioning pins, or cannot be pulled out after insertion. In traditional assembly processes, when the above situations occur, secondary lifting or external force is applied to guide the barrel section into the positioning hole. This process will directly or indirectly lead to stress concentration during the assembly process and deviations in the shape of the aircraft barrel section.

[0003] During assembly, due to machining errors in the positioning holes of the barrel section, traditional cylindrical positioning pins cannot be inserted smoothly when the positioning hole diameter is small, and will fail to play an accurate positioning role when the positioning hole diameter is large. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide an adaptive expansion positioning mechanism for assembling and positioning aircraft barrel sections.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned objective is: an adaptive expansion positioning mechanism for assembling and positioning aircraft barrel sections, comprising a positioning pin, the lower part of which is inserted into the outer shell, and corresponding pin holes are formed in both. When the pin holes of the two are on the same axis, a height-adjusting pin is inserted. A nut is fitted between the positioning pin and the outer shell, and the positioning pin is threadedly connected to the nut. The lower end of the nut is supported on a step inside the outer shell. A support plate is fitted on the nut, and the lower end face of the support plate is supported on the outer shell. A groove on the outer periphery of the nut is located above the support plate. A lifting handle and a lever are installed on the support plate, and the lever is positioned on the lever... Inside the groove, a washer is fitted on the outer side of the upper part of the positioning pin, a mandrel is inserted into the inner side of the upper part of the positioning pin, a tapered column is fitted on the outer side of the mandrel, an expansion sleeve is fitted on the outer side of the tapered surface of the upper part of the tapered column, the expansion sleeve is supported on the upper end face of the positioning pin, a nut is fitted between the lower part of the tapered column and the positioning pin, the tapered column and the nut are threaded together, the nut has an installation hole, the positioning pin has an installation moving groove corresponding to the installation hole, a positioning handle is installed on the nut, one end of the positioning handle passes through the installation moving groove and is inserted into the installation hole, a top cover is provided above the expansion sleeve and the tapered column, and the top cover is installed on the mandrel.

[0006] The outer casing is mounted on the transition plate.

[0007] A thrust bearing is installed at the lower end of the nut and at the step inside the housing, and the thrust bearing is fitted between the locating pin and the housing.

[0008] A limiting ring is installed on the upper end of the nut, and the limiting ring is fitted between the positioning pin and the tapered column.

[0009] The lower part of the positioning pin is provided with a guide groove, and a guide key is inserted in the guide groove. The other end of the guide key is installed on the outer shell.

[0010] The invention is characterized by a mechanical transmission mechanism that allows operators to easily achieve precise positioning during the hoisting of the aircraft canister segment. The positioning pin diameter is smaller than the positioning hole diameter of the canister segment. Upon insertion, the operator expands the positioning sleeve, securing the canister segment in the correct position without interfering with the canister segment structure. This mechanism maintains accurate positioning even when the positioning hole diameter is larger than or equal to the theoretical efficiency value. When the aircraft canister segment is assembled and hoisted away, the structure allows for manual adjustment to reduce the positioning pin diameter and lower the positioning surface height, causing the positioning pin to actively disengage from the canister segment, thus completely preventing any jerking or pulling during hoisting. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention.

[0012] Figure 2 This is a cross-sectional view of the present invention.

[0013] Figure 3 This is an exploded view of the present invention.

[0014] The components include: 1. Positioning handle; 2. Paddle; 3. Lifting handle; 4. Height pin; 5. Transition plate; 6. Housing; 7. Thrust bearing; 8. Support plate; 9. Nut; 10. Positioning pin; 11. Washer; 12. Nut; 13. Limiting ring; 14. Expansion sleeve; 15. Conical column; 16. Mandrel; 17. Top cover; 18. Guide sleeve; 19. Guide groove; 20. Mounting hole; 21. Mounting movement groove; 22. Paddle groove. Detailed Implementation

[0015] like Figure 1-3As shown, the present invention is an adaptive expansion positioning mechanism for assembling and positioning aircraft barrel sections. It includes a positioning pin 10, the lower part of which is inserted into a housing 6. A guide groove 19 is formed at the lower part of the positioning pin 10, and a guide key 18 is inserted into the guide groove 19. The other end of the guide key 18 is mounted on the housing 6. The guide key 18 prevents the positioning pin 10 from rotating along its axis, allowing it to move only axially. The housing 6, as the main load-bearing structural component, is made of high-strength material. It bears the force transmitted by the upper parts and also serves as a positioning element, cooperating with the positioning pin 10 to restrict its movement only axially. The lower end of the housing 6 is mounted on a transition plate 5. The transition plate 5 transitions the present invention to its working position and ensures sufficient support strength. It also ensures the height and coaxiality references of the upper-level installed parts through a positioning base surface.

[0016] A nut 9 is fitted between the positioning pin 10 and the outer shell 6, and the positioning pin 10 and the nut 9 are threaded together. A thrust bearing 7 is installed at the lower end of the nut 9 and the step inside the outer shell 6. The thrust bearing 7 is fitted between the positioning pin 10 and the outer shell 6. A support plate 8 is fitted on the nut 9, and the lower end face of the support plate 8 is supported on the outer shell 6. The groove 22 on the outer periphery of the nut 9 is located above the support plate 8. A lifting handle 3 and a lever 2 are installed on the support plate 8, and the lever 2 is set in the groove 22. The above structure forms a ratchet mechanism, which realizes lifting through mechanical transmission, thereby driving the upper expansion positioning mechanism to the theoretical position. The thrust... The bearing 7 is used to maintain the theoretical space between the support plate 8, the nut 9 and the housing 6, and to prevent the two parts from being too tightly fitted and unable to rotate due to the load on the upper part. When the operator operates the lifting handle 3, the support plate 8 is driven to transmit the rotational force to the nut 9 through the lever 2. Since the nut 9 has high-strength threads inside and outside the positioning pin 10 for force transmission, the nut drives the positioning pin 10 to move up and down. The upper outer side of the positioning pin 10 is fitted with a washer 11. The positioning pin 10 and the housing 6 have corresponding pin holes. When the pin holes of the two are coaxial, a height pin 4 is inserted into the pin holes of the two. At this time, the upper end surface of the washer 11 is the theoretical height of the contact surface with the aircraft product.

[0017] A mandrel 16 is inserted into the inner side of the upper part of the positioning pin 10, and an anti-rotation pin is installed between them to prevent the mandrel 16 from rotating axially. A tapered column 15 is fitted on the outer side of the mandrel 16, and an anti-rotation pin is installed between them to prevent the tapered column 15 from rotating axially. An expansion sleeve 14 is fitted on the outer side of the upper tapered surface of the tapered column 15, and the expansion sleeve 14 is supported on the upper end face of the positioning pin 10. A nut 12 is fitted between the lower part of the tapered column 15 and the positioning pin 10, and the tapered column 15 and the nut 12 are threadedly connected. A limit ring 13 is installed on the upper end of the nut 12, and the limit ring 13 is fitted on the positioning pin 10. Between pin 10 and cone column 15, the limiting ring 13 is used to restrict the up-and-down movement of nut 12, thereby transmitting the lifting transmission to cone column 15. Nut 12 has a mounting hole 20, and the positioning pin 10 has a mounting movement groove 21 corresponding to the mounting hole 20. A positioning handle 1 is mounted on nut 12, with one end of the positioning handle 1 passing through the mounting movement groove 21 and inserted into the mounting hole 20. A top cover 17 is provided above the expansion sleeve 14 and cone column 15, and the top cover 17 is mounted on the spindle 16. The top cover 17 is made of high-strength material, wear-resistant and impact-resistant. At the top of this invention, a guide cone surface is provided to facilitate hoisting and positioning. The height design ensures that its lower end face does not contact the expansion sleeve 14, protecting the expansion sleeve 14 from hoisting impacts and preventing deformation and failure. This structure forms an expansion positioning mechanism. Expansion positioning is performed by operating the positioning handle 1. Since the internal thread of the nut 12 mates with the thread on the lower outer side of the cone 15, when the positioning handle 1 is inserted into the mounting hole 20, pushing the positioning handle 1 causes the nut 12 to rotate. The rotational motion of the nut 12 is converted into the lifting motion of the cone 15. When expansion is required, the nut... 12. Rotation causes the cone column 15 to descend. The upper cone surface of the cone column 15 cannot descend because the lower end face of the expansion sleeve 14 is in contact with the upper end face of the positioning pin 10. Finally, the upper cone surface of the cone column 15 drives the inner cone surface of the expansion sleeve 14 to move away from the axis of normal, thereby realizing the change of the outer diameter. The expansion sleeve 14 is made of a special elastic material that has good elasticity while taking into account rigidity. Combined with the elastic release groove and stress reduction hole on the expansion sleeve 14, it is ensured that after the cone surface of the cone column 15 rises and separates from the cone surface of the expansion sleeve 14, the expansion sleeve 14 can rebound to the theoretical size by its own elasticity.

[0018] The operation process of this invention is as follows: 1. Before the barrel segment is hoisted into place, the operator rotates the positioning handle 1 clockwise to increase the diameter of the expansion sleeve 14 for positioning; 2. Before the barrel segment is hoisted away, the operator rotates the positioning handle 1 counterclockwise to decrease the diameter of the expansion sleeve; 3. Before the barrel segment is hoisted away, the operator pulls out the height pin 4; 4. Before the barrel segment is hoisted away, the operator rotates the lifting handle 3 counterclockwise to lower the positioning pin 10 and disengage it from the barrel segment positioning hole; 5. After the barrel segment is hoisted away, the operator operates the lever 2 to perform the lifting and reversing operation; 6. After the barrel segment is hoisted away, the operator rotates the lifting handle 3 clockwise to raise the positioning pin 10 to the standard height; 7. After the barrel segment is hoisted away, the operator inserts the height pin 4 to position the theoretical height of the upper end face.

[0019] When the expansion positioning mechanism is inside the positioning hole, the gasket 11 contacts the product to limit the theoretical height. At this time, the operation causes the expansion sleeve 14 to expand, which can guide the positioning hole axis to be coaxial with the positioning mechanism. All dimensions within the machining tolerance range of the positioning hole can be positioned by the expansion sleeve. The dimensional fit design makes the final expansion outer circle axis coaxial with the theoretical axis.

[0020] This invention will significantly reduce the risks associated with hoisting aircraft barrel segments, avoid stress concentration caused by external forces applied during assembly, and integrate the mechanisms through innovative design, enabling operators to easily and quickly position and detach the positioning mechanism.

[0021] The application of this invention solves the pain points of traditional positioning tooling products, improves product quality, reduces scrap rate, and increases production cycle efficiency, providing strong support for the rapid production of aircraft products.

[0022] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An adaptive expansion positioning mechanism for assembling and positioning aircraft barrel sections, characterized in that: The device includes a positioning pin, the lower part of which is inserted into the outer casing. Corresponding pin holes are formed in both the positioning pin and the outer casing. When the pin holes are on the same axis, a height-adjusting pin is inserted. A nut is fitted between the positioning pin and the outer casing, and the positioning pin is threadedly connected to the nut. The lower end of the nut is supported on a step inside the outer casing. A support plate is fitted onto the nut, and the lower end face of the support plate supports the outer casing. A groove on the outer periphery of the nut is located above the support plate. A lifting handle and a lever are mounted on the support plate, and the lever is positioned within the groove. A washer is fitted onto the upper outer side of the positioning pin. A mandrel is inserted into the inner side of the upper part of the positioning pin. A tapered column is fitted onto the outer side of the mandrel. An expansion sleeve is fitted onto the outer side of the tapered surface of the upper part of the tapered column. The expansion sleeve is supported on the upper end face of the positioning pin. A nut is fitted between the lower part of the tapered column and the positioning pin. The tapered column and the nut are threaded together. An installation hole is provided on the nut. An installation moving groove corresponding to the installation hole is provided on the positioning pin. A positioning handle is installed on the nut. One end of the positioning handle passes through the installation moving groove and is inserted into the installation hole. A top cover is provided above the expansion sleeve and the tapered column. The top cover is installed on the mandrel.

2. The adaptive expansion positioning mechanism for assembling and positioning aircraft barrel segments as described in claim 1, characterized in that: The outer casing is mounted on the transition plate.

3. The adaptive expansion positioning mechanism for assembling and positioning aircraft barrel sections as described in claim 1, characterized in that: A thrust bearing is installed at the lower end of the nut and at the step inside the housing, and the thrust bearing is fitted between the locating pin and the housing.

4. The adaptive expansion positioning mechanism for assembling and positioning aircraft barrel segments as described in claim 1, characterized in that: A limiting ring is installed on the upper end of the nut, and the limiting ring is fitted between the positioning pin and the tapered column.

5. The adaptive expansion positioning mechanism for assembling and positioning aircraft barrel sections as described in claim 1, characterized in that: The lower part of the positioning pin is provided with a guide groove, and a guide key is inserted in the guide groove. The other end of the guide key is installed on the outer shell.

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