A support nut adjustable riveting tool suitable for thin-walled casings

Abstract

The present invention relates to the field of aircraft engine casing assembly and discloses a support plate nut adjustable riveting tool suitable for thin-walled casings. The pressure riveting assembly adopts an adjusting screw with a hollow structure to achieve coarse position adjustment and clamping and positioning of the parts to be riveted, which can ensure that the rivet hole orientation of the riveting head and the support plate nut is not offset during the riveting process, thereby improving the riveting quality; the riveting head and the force bolt located in the hollow structure are separated by steel balls to form a split force transmission assembly, and the steel balls, the force bolt and the riveting head are all in point contact, which can prevent the force bolt from rotating and driving the riveting head to rotate, and almost completely convert the rotational torque into extrusion force, which is easy to accurately control the extrusion parameters through a torque wrench; and the non-rotation of the riveting head can also avoid the problem of friction between the riveting head and the support plate nut, thereby avoiding the problem of relative friction between the support plate nut and the riveting head causing the plating of the support plate nut to fall off.

Description

Technical Field

[0001] The invention relates to the field of aircraft engine casing assembly and discloses a support plate nut adjustable riveting tool suitable for thin-walled casings. Background Art

[0002] Due to their long lifespan, excellent fastening properties, and replaceability, pallet nuts are widely used in thin-walled parts in the aviation and aerospace industries. The assembly principle of pallet nuts is to squeeze them, causing them to plastically deform, tightly fitting the part and becoming an integral part, thus securing the thread.

[0003] Aircraft engine casings are typical irregularly shaped, thin-walled parts, often featuring narrow, irregular cavities. When riveting nuts onto these thin-walled casings, the narrow and irregular space makes it difficult to accommodate tooling and position and clamp them, resulting in poor quality and low efficiency when riveting the nut on the carrier plate.

[0004] When installing universal support plate nuts, excessive force and unreasonable pressure head mechanism can easily lead to assembly quality problems such as extrusion cracking of the support plate nuts and shedding of the silver plating layer. Summary of the Invention

[0005] The purpose of the present invention is to provide a support plate nut adjustable riveting tool suitable for thin-walled receivers, which can prevent the rotation of the force bolt from driving the riveting head to rotate, and almost completely convert the rotational torque into extrusion force, which is easy to accurately control the extrusion parameters through a torque wrench; and the non-rotation of the riveting head can also avoid the problem of friction between the riveting head and the support plate nut, thereby avoiding the problem of relative friction between the support plate nut and the riveting head causing the plating of the support plate nut to fall off.

[0006] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0007] The cam is provided with an adjusting screw which is perpendicular to the surface of the force-bearing seat, and an outer thread of the adjusting screw is provided on the outer wall of the adjusting screw so as to cooperate with the threaded hole. The adjusting screw is provided with a hollow structure along the length direction, and a rivet pressure head which cooperates with the force-bearing seat is provided in the hollow structure of the adjusting screw, and the head of the rivet pressure head extends out of the hollow structure of the adjusting screw. The rivet pressure head rod located in the hollow structure is provided with a radial convex ring, and the inner wall of the hollow structure of the adjusting screw is provided with a limiting shrinkage which cooperates with the radial convex ring, and a compressed spring is provided between the radial convex ring and the limiting shrinkage; a force bolt is installed on the side away from the rivet pressure head through threaded cooperation in the hollow structure of the adjusting screw; a steel ball is also provided in the hollow structure of the adjusting screw, and the steel ball is located between the force bolt and the rivet pressure head.

[0008] Furthermore, the support rod is provided with an external thread at the position where the force seat is installed, and the support rod is provided with an adjusting nut that can limit the force seat, and the adjusting nut is used to adjust or limit the relative height of the force seat and the bearing seat.

[0009] Furthermore, the force applying seat includes a fixed block and a movable block, the fixed block is mounted on the support rod, and the movable block is movably mounted on the fixed block through a dovetail groove assembly.

[0010] Furthermore, a scale for indicating the relative displacement between the movable block and the fixed block is provided on the fixed block or the movable block.

[0011] Furthermore, a first locking screw is provided between the fixed block and the movable block for fixing the relative positions of the fixed block and the movable block.

[0012] Furthermore, the load-bearing seat is movably mounted on the base through a sliding groove.

[0013] Furthermore, a second locking screw is provided between the base and the bearing seat for fixing the relative positions of the base and the bearing seat.

[0014] Furthermore, the outer wall of the adjusting screw is provided with a limiting nut which can contact the force applying seat.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The rivet assembly of the present invention adopts an adjusting screw with a hollow structure to achieve coarse position adjustment and clamping positioning of the parts to be riveted, which can ensure that the rivet hole orientation of the rivet head and the support plate nut is not offset during the riveting process, thereby improving the riveting quality; the rivet head and the force bolt located in the hollow structure are separated by steel balls to form a split force transmission assembly, and the steel balls and the force bolt and the rivet head are all in point contact, which can prevent the force bolt from rotating and driving the rivet head to rotate, and almost completely convert the rotational torque into extrusion force, which is easy to accurately control the extrusion parameters through a torque wrench; and the rivet head does not rotate, which can also avoid the problem of friction between the rivet head and the support plate nut, thereby avoiding the problem of relative friction between the support plate nut and the rivet head causing the plating of the support plate nut to fall off. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a support plate nut adjustable riveting tool suitable for thin-walled casings in an embodiment;

[0018] Figure 2 Schematic diagram of the structure of the riveting assembly in the embodiment;

[0019] Figure 3 Schematic diagram of the installation of the thin-walled casing and the support plate nut on the riveting tool in the embodiment;

[0020] Among them, 1. Base; 2. Support rod; 3. Bearing seat; 4. Adjusting screw; 5. Riveted pressure head; 6. Radial convex ring; 7. Limiting neck; 8. Spring; 9. Force bolt; 10. Steel ball; 11. Adjusting nut; 12. Fixed block; 13. Movable block; 14. Dovetail groove assembly; 15. First locking screw; 16. Slide groove; 17. Second locking screw; 18. Limiting nut; 19. Support plate nut; 20. Thin-walled casing. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the present invention to the following embodiments, as all technologies implemented based on the present invention fall within the scope of the present invention.

[0022] Example

[0023] See also Figure 1-Figure 3 A support nut adjustment riveting tool suitable for thin-walled receivers includes a base 1, on which a support rod 2 and a bearing seat 3 are installed; a force-applying seat is provided on the support rod 2, and a pressure riveting assembly is provided on the force-applying seat through a threaded hole; the pressure riveting assembly includes an adjusting screw 4 perpendicular to the surface of the bearing seat 3, and an outer wall of the adjusting screw 4 is provided with an external thread that matches the threaded hole; the adjusting screw 4 is provided with a hollow structure along the length direction, and a riveting pressure head 5 that matches the bearing seat 3 is provided in the hollow structure of the adjusting screw 4. The head of the adjusting screw 4 extends out of the hollow structure of the adjusting screw 4; the rod of the riveting pressure head 5 located in the hollow structure is provided with a radial convex ring 6, and the inner wall of the hollow structure of the adjusting screw 4 is provided with a limiting constriction 7 that cooperates with the radial convex ring 6, and a compressed spring 8 is provided between the radial convex ring 6 and the limiting constriction 7; the hollow structure of the adjusting screw 4 is provided with a force bolt 9 installed on the side away from the riveting pressure head 5 through threaded cooperation; the hollow structure of the adjusting screw 4 is also provided with a steel ball 10, and the steel ball 10 is located between the force bolt 9 and the riveting pressure head 5.

[0024] In this embodiment, when it is necessary to rivet the support plate nut 19 on the part to be riveted, such as a thin-walled casing 20, the support plate nut 19 is positioned on the bearing seat 3, and then the support plate nut 19 on the riveted part is prefabricated in the hole; by rotating the adjusting screw 4, the bottom surface of the adjusting screw 4 is clamped and positioned with the surface of the part to be riveted, or the bottom surface of the riveting pressure head 5 extending out of the hollow inner cavity of the adjusting screw 4 can be clamped and positioned with the surface of the part to be riveted to prevent the part to be riveted from shifting during riveting; finally, a riveting torque wrench is used to apply torque to the force bolt 9, and with the cooperation of the threaded hole, the force bolt 9 rotates downward to squeeze the riveting pressure head 5, and then squeezes the support plate nut 19 to cause it to undergo plastic deformation, so that the support plate nut 19 is tightly fitted with the prefabricated hole of the part to be riveted; after the riveting is completed, the torque wrench applies torque to the force bolt 9 in the reverse direction, and the riveting pressure head 5 retracts under the action of the spring 8, and the tooling can be removed by rotating the adjusting screw 4 in the reverse direction. The rivet assembly in this embodiment adopts a hollow structure of the adjusting screw 4 to achieve coarse position adjustment and clamping positioning of the riveted parts, which can ensure that the rivet hole orientation of the riveting head 5 and the support plate nut 19 is not offset during the riveting process, thereby improving the riveting quality; the riveting head 5 and the force bolt 9 located in the hollow structure are separated by a steel ball 10 to form a split force transmission component, and the steel ball 10 and the force bolt 9 and the riveting head 5 are all in point contact, which can prevent the force bolt 9 from rotating and driving the riveting head 5 to rotate, and almost completely convert the rotational torque into extrusion force, which is easy to accurately control the extrusion parameters through a torque wrench; and the non-rotation of the riveting head 5 can also avoid the problem of friction between the riveting head 5 and the support plate nut 19, thereby avoiding the problem of relative friction between the support plate nut 19 and the riveting head 5 causing the plating of the support plate nut 19 to fall off.

[0025] The support rod 2 is provided with an external thread at the position where the force seat is installed, and the support rod 2 is provided with an adjusting nut 11 that can limit the force seat. The adjusting nut 11 is used to adjust or limit the relative height of the force seat and the force bearing seat 3. In order to achieve stable fixation of the force seat, two adjusting nuts 11 are provided on the external thread of the support rod 2 in this embodiment; when it is necessary to adjust the height (or distance) of the force seat relative to the force bearing seat 3, the two adjusting nuts 11 can be rotated to the specified position. Then, the position of the force seat can be fixed by clamping the force seat between the two adjusting nuts 11 using the two adjusting nuts 11. The riveting tool can adjust the distance between the force seat and the force bearing seat 3 according to the size of the casing structure to meet the riveting of different parts with the support plate nut 19, thereby improving the versatility of the riveting tool.

[0026] In addition, the force-applying seat in this embodiment includes a fixed block 12 and a movable block 13. The fixed block 12 is mounted on the support rod 2, and the movable block 13 is movably mounted on the fixed block 12 via a dovetail groove assembly 14. The dovetail groove assembly 14 is used to clamp the fixed block 12 and the movable block 13 of the force-applying seat in a movable manner, which can adaptively adjust the position of the movable seat, making it easy to quickly adjust and position the riveting point between the support plate nut 19 and the part to be riveted.

[0027] The fixed block 12 or the movable block 13 is provided with a scale for indicating the relative displacement between the movable block 13 and the fixed block 12. In this embodiment, the position of the riveting pressure point in the radial direction of the thin-walled casing 20 can be adjusted by adjusting or observing the position indicated by the scale, so as to facilitate rapid riveting positioning.

[0028] In this embodiment, a first locking screw 15 is provided between the fixed block 12 and the movable block 13 to achieve relative position fixation of the fixed block 12 and the movable block 13. The first locking screw 15 is used to loosen the first locking screw 15 when the movable block 13 is adjusted, so as to facilitate the relative position adjustment of the movable block 13 and the fixed block 12; after the position is adjusted to the right position, the first locking screw 15 can be tightened to fix the movable block 13 and the fixed block 12 relative to each other, thereby avoiding the problem of displacement of the movable block 13 during the riveting process, resulting in abnormal riveting or reduced riveting quality. It should be noted that there are many ways to cooperate with the first locking screw 15 and the movable block 13 and the fixed block 12. For example, a movable groove can be provided on the fixed block 12 alone, and a screw hole can be provided on the movable block 13. Fixation is achieved by cooperating with the first locking screw 15 and the screw hole, and the position adjustment of the fixed block 12 can be achieved by adjusting the relative position of the first locking screw 15 in the movable groove. In addition, because a dovetail groove assembly 14 is used between the movable block 13 and the fixed block 12 to prevent the movable block 13 from falling off, the screw hole that cooperates with the first locking screw 15 can also be fixedly set on the fixed block 12. By rotating the first locking screw 15, a thrust is generated on the movable block 13. Under the action of the dovetail groove assembly 14, the movable block 13 can be pressed against the fixed block 12 to achieve the fixed relative position of the movable block 13 and the fixed block 12.

[0029] The load-bearing seat 3 is movably mounted on the base 1 through a slide 16. The relative position adjustment between the load-bearing seat 3 and the base 1 can also be achieved. By adjusting the position of the load-bearing seat 3, the riveting point on the thin-walled casing 20 is aligned with the riveting pressure head 5 to achieve rapid positioning. Since the load-bearing seat 3 is installed above the base 1, the slide 16 here can be a conventional rectangular slide 16, or a structure similar to the dovetail groove assembly 14; a second locking screw 17 for achieving relative position fixation between the base 1 and the load-bearing seat 3 in this embodiment is provided between the base 1 and the load-bearing seat 3, and the second locking screw 17 can also be used to achieve fixation after the relative position adjustment between the load-bearing seat 3 and the base 1.

[0030] In order to ensure further fixation of the adjusting screw 4 after the position is adjusted, a limiting nut 18 that can contact the force-applying seat can be provided on the outer wall of the adjusting screw 4 in this embodiment. Figure 1 As shown, by rotating the limit nut 18 to generate an interaction force with the force-applying seat, the adjusting screw 4 is fixed, avoiding the problem of the adjusting screw 4 being driven to rotate during the rotation of the force-applying bolt 9, and ensuring the fixing effect of the thin-walled casing 20.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A support nut adjustable riveting tool suitable for thin-walled casings, characterized in that: The invention comprises a base (1), wherein a support rod (2) and a force bearing seat (3) are mounted on the base (1); a force application seat is provided on the support rod (2), and a pressure riveting assembly is provided on the force application seat through a threaded hole; the pressure riveting assembly comprises an adjusting screw (4) perpendicular to the surface of the force bearing seat (3), and the outer wall of the adjusting screw (4) is provided with an external thread that matches the threaded hole; the adjusting screw (4) is provided with a hollow structure along the length direction, and a riveting pressure head (5) that matches the force bearing seat (3) is provided in the hollow structure of the adjusting screw (4), and the head of the riveting pressure head (5) extends out of the hollow structure of the adjusting screw (4). The outer portion of the riveting pressure head (5) located in the hollow structure is provided with a radial convex ring (6), the inner wall of the hollow structure of the adjusting screw (4) is provided with a limiting constriction (7) that cooperates with the radial convex ring (6), and a compressed spring (8) is provided between the radial convex ring (6) and the limiting constriction (7); a force bolt (9) is installed on the side of the hollow structure of the adjusting screw (4) away from the riveting pressure head (5) through threaded cooperation; a steel ball (10) is also provided in the hollow structure of the adjusting screw (4), and the steel ball (10) is located between the force bolt (9) and the riveting pressure head (5); The support rod (2) is provided with an external thread at a position where the force-applying seat is installed, and the support rod (2) is provided with an adjusting nut (11) capable of limiting the position of the force-applying seat, and the adjusting nut (11) is used to adjust or limit the relative height between the force-applying seat and the force-bearing seat (3); The force-applying seat comprises a fixed block (12) and a movable block (13); the fixed block (12) is mounted on the support rod (2); and the movable block (13) is movably mounted on the fixed block (12) via a dovetail groove assembly (14); and a scale for indicating the relative displacement between the movable block (13) and the fixed block (12) is provided on the fixed block (12) or the movable block (13).

2. The support plate nut adjustable riveting tool suitable for thin-walled casings according to claim 1 is characterized in that: A first locking screw (15) is provided between the fixed block (12) and the movable block (13) for fixing the relative positions of the fixed block (12) and the movable block (13).

3. The support plate nut adjustable riveting tool suitable for thin-walled casings according to claim 1, characterized in that: The bearing seat (3) is movably mounted on the base (1) via a sliding groove (16).

4. The support plate nut adjustable riveting tool suitable for thin-walled casings according to claim 3, characterized in that: A second locking screw (17) is provided between the base (1) and the force bearing seat (3) for fixing the relative positions of the base (1) and the force bearing seat (3).

5. The support plate nut adjustable riveting tool suitable for thin-walled casings according to claim 1, characterized in that: The outer wall of the adjusting screw (4) is provided with a limiting nut (18) capable of contacting the force application seat.

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