A protective cover plate connecting structure

Abstract

This invention discloses a protective cover plate connection structure. It includes a tail section shell, with an inner cover plate and an outer cover plate sequentially arranged from the inside out on the end face of the tail section shell. A threaded hole is provided circumferentially along the inner lip of the tail section shell end face. The inner cover plate has countersunk holes and inner cover plate through holes; the outer cover plate has adapter through holes and outer cover plate through holes. The outer cover plate through holes, inner cover plate through holes, and threaded holes are coaxially arranged, as are the adapter through holes and countersunk holes. A fixing rivet nut is installed inside the countersunk hole. The inner cover plate and tail section shell are fixed by connecting screws that pass sequentially through the outer cover plate through holes and inner cover plate through holes and are then screwed into the threaded holes. The maximum diameter of the connecting screw can freely pass through the outer cover plate through hole. The outer cover plate and inner cover plate are fixed by adapter screws that pass sequentially through the adapter through hole and countersunk hole and are then screwed into the rivet nut. This invention enables the inner and outer cover plates to be installed and removed without affecting each other, and improves the efficiency of installation and removal.

Description

Technical Field

[0001] This utility model relates to the field of connection structure technology, and in particular to a protective cover plate connection structure. Background Technology

[0002] The rear end face of the stern compartment features a double-layer protective cover structure. The inner cover protects the stern compartment from foreign objects, while the outer cover secures the control surface shield to prevent accidental damage during use. Screws connect both covers. During product testing, when the outer cover needs to be removed, the inner cover is simultaneously removed. To prevent foreign objects from entering the stern compartment, the removed screws must be reinstalled to secure the inner cover to the rear end face of the stern compartment. After product testing is complete, when the outer cover is reinstalled, the screws securing the inner cover must be removed, and the inner and outer covers must be installed before tightening the connecting screws. This double-layer protective cover connection structure increases the complexity and time cost of disassembly and assembly. The product has been mass-produced and delivered, and the protective cover has been installed on the stern hatch shell. The structure is unsuitable for return for modification, and the products are stored in various locations, most of which lack machine tools or other machining equipment. According to design requirements, the stern hatch shell structure cannot be altered; only partial modifications to the protective cover structure are permissible, and these must be performed using handheld portable equipment. Simultaneously, the connection method between the double-layer cover and the stern hatch shell must be retained. The double-layer cover is a thin aluminum alloy plate structure. Direct threaded connection results in a limited number of thread turns on the thin plate, and the connection performance cannot be improved by adding wire thread inserts. For low-strength aluminum alloy materials, the strength and load-bearing capacity of directly generated threads are limited. Furthermore, aluminum alloy threads are prone to stripping and failure after repeated disassembly and assembly, introducing new risks. Utility Model Content

[0003] The purpose of this invention is to provide a protective cover plate connection structure. This invention enables the inner and outer cover plates to be installed and removed without affecting each other, and improves the efficiency of installation and removal.

[0004] The technical solution of this utility model: A protective cover plate connection structure includes a tail hatch shell. An inner cover plate and an outer cover plate are sequentially arranged from the inside to the outside on the end face of the tail hatch shell. A threaded hole is provided circumferentially along the inner lip of the end face of the tail hatch shell. The inner cover plate has countersunk holes and inner cover plate through holes. The outer cover plate has adapter through holes and outer cover plate through holes. The outer cover plate through holes, inner cover plate through holes, and threaded holes are coaxially arranged. The adapter through holes and countersunk holes are coaxially arranged. A fixing rivet nut is installed inside the countersunk hole. The inner cover plate and tail hatch shell are fixed by connecting screws that pass sequentially through the outer cover plate through holes and inner cover plate through holes and are then screwed into the threaded holes. The maximum diameter of the connecting screw can freely pass through the outer cover plate through hole. The outer cover plate and inner cover plate are fixed by adapter screws that pass sequentially through the adapter through holes and countersunk holes and are then screwed into the rivet nut.

[0005] In the aforementioned protective cover connection structure, an adapter spring washer is provided between the adapter screw and the adapter through hole.

[0006] In the aforementioned protective cover plate connection structure, the chamfer angle of the outer end of the countersunk hole is 120 degrees.

[0007] In the aforementioned protective cover plate connection structure, the end of the rivet nut is designed to be countersunk.

[0008] In the aforementioned protective cover plate connection structure, an inner cover plate spring washer is provided between the connecting screw and the through hole of the inner cover plate.

[0009] In the aforementioned protective cover connection structure, both the inner cover and the outer cover are made of thin aluminum alloy plates. The beneficial effects of this utility model are: the protective cover can be fixed on the tail section shell, the disassembly and assembly of the outer cover and the inner cover do not affect each other during product testing, the structural improvement is not limited by the site and professional equipment, and the improved connection structure can improve the disassembly and assembly efficiency. Attached Figure Description

[0010] Figure 1 This is a sectional view of the connection structure; Figure 2 This is a schematic diagram of the stern compartment hull; Figure 3 This is the front view of the inner cover plate; Figure 4 This is a schematic diagram showing the connection between the rivet nut and the inner cover plate; Figure 5 This is the front view of the outer cover plate; Figure 6 This is a schematic diagram showing the connection between the tail section shell and the inner cover. Detailed Implementation

[0011] Example 1. A protective cover plate connection structure, such as... Figures 1-6 As shown, the device includes a tail section shell 1. From the inside out, the tail section shell 1 has an inner cover plate 2 and an outer cover plate 3 on its end face. A threaded hole 8 is provided circumferentially on the inner lip of the end face of the tail section shell 1. The inner cover plate 2 has countersunk holes 9 and inner cover plate through holes 10. The outer cover plate 3 has a transition through hole 11 and an outer cover plate through hole 12. The outer cover plate through hole 12, the inner cover plate through hole 10, and the threaded hole 8 are coaxially arranged. The transition through hole 11 and the countersunk hole 9 are coaxially arranged. A fixing rivet nut 6 is installed inside the countersunk hole 9. The inner cover plate 2 and the tail section shell 1 are fixed by connecting screws 7 that pass through the outer cover plate through hole 12 and the inner cover plate through hole 10 in sequence and are screwed into the threaded hole 8. The maximum diameter of the connecting screw 7 can freely pass through the outer cover plate through hole 12. The outer cover plate 3 and the inner cover plate 2 are fixed by connecting screws 4 that pass through the transition through hole 11 and the countersunk hole 9 in sequence and are screwed into the rivet nut 6.

[0012] Both the inner cover plate 2 and the outer cover plate 3 are made of thin aluminum alloy sheets, which cannot be directly tapped on the body. A press-fit nut or a pull-fit nut can be added to the inner cover plate 2 to improve the connection performance. After the press-fit nut is formed, one side of the cover plate is the nut, and the other side of the inner cover plate has no height change and is flush with the surface of the cover plate. The connection form of the two cover plates after press-fitting is more in line with the original structural design. However, the press-fit nut requires a press-fitting machine to operate, and the product storage place does not have the forming conditions. The rivet nut 6 can be riveted using a handheld rivet gun, which is relatively simple. However, after riveting, both sides of the rivet nut 6 protrude above the inner cover plate 2. To prevent the rivet nut 6 from protruding above one side of the inner cover plate 2, the connecting hole of the inner cover plate 2 is designed as a countersunk hole 9. The countersunk hole 9 is used to install and fix the rivet nut 6. To increase the contact area, the angle of the countersunk hole 9 is designed to be 120 degrees, and the end of the rivet nut 6 is designed to be countersunk. In the structural improvement, after the inner cover plate 2 is removed, the countersunk hole 9 is processed by a handheld device, and the rivet nut 6 and the inner cover plate 2 are integrated into a single structure using a portable rivet gun. At this time, the inner cover plate 3 has internal thread characteristics, and the rivet nut 6 does not protrude from the surface of the inner cover plate 2 that contacts the outer cover plate 3. The inner cover plate 2 is still in direct contact with the outer cover plate 3, and the original outer envelope size of the structure is not changed. An adapter through hole 11 is provided on the outer cover plate 3. The adapter through hole 11 corresponds spatially to the countersunk hole 9 of the inner cover plate 2. The adapter screw 4 passes through the adapter through hole 11 of the outer cover plate 3 and is connected and fixed to the rivet nut 6 on the inner cover plate 2. The inner cover plate 2 has an inner cover plate through hole 10. The inner cover plate 2 corresponds spatially to the threaded hole 8 of the tail hatch shell 1 and is connected and fixed by a connecting screw 7. The connecting screw 7 only connects the inner cover plate 2 to the tail hatch shell 1. An outer cover plate through hole 12 is provided at the position of the connecting screw 7 corresponding to the outer cover plate 3. The diameter of the outer cover plate through hole 12 is larger than the diameter of the head of the connecting screw 7, and the entire connecting screw 7 can pass through the outer cover plate through hole 12.

[0013] When it is necessary to remove the outer cover plate 3, simply remove the adapter screw 4 to separate the outer cover plate 3 from the tail section shell 1. At this time, the inner cover plate 2 is still fixed to the tail section shell 1 by the connecting screw 7 and the inner cover plate spring washer 13. When it is necessary to remove the inner cover plate 2, simply remove the connecting screw 7 and the inner cover plate spring washer 13 to separate the inner cover plate 2 from the tail section shell 1. The outer cover plate 3 and the inner cover plate 2 form an integral connection structure through the adapter screw 4, the spring washer 5, and the rivet nut 6. After releasing the constraint of the adapter screw 4, the inner cover plate 2 and the outer cover plate 3 form independent structures that do not affect each other during disassembly and assembly.

Claims

1. A protective cover plate connection structure, characterized in that, The structure includes a tail section shell (1), with an inner cover plate (2) and an outer cover plate (3) arranged sequentially from the inside to the outside on the end face of the tail section shell (1); a threaded hole (8) is provided circumferentially on the inner lip of the end face of the tail section shell (1); countersunk holes (9) and inner cover plate through holes (10) are distributed on the inner cover plate (2); a transition through hole (11) and an outer cover plate through hole (12) are distributed on the outer cover plate (3); the outer cover plate through hole (12), the inner cover plate through hole (10), and the threaded hole (8) are coaxially arranged, and the transition through hole (11) and the countersunk hole (9) are arranged circumferentially. The inner side of the countersunk hole (9) is equipped with a fixed rivet nut (6); the inner cover plate (2) and the tail compartment shell (1) are fixed by a connecting screw (7) that passes through the outer cover plate through hole (12) and the inner cover plate through hole (10) in sequence and is then screwed into the threaded hole (8). The maximum diameter of the connecting screw (7) can freely pass through the outer cover plate through hole (12); the outer cover plate (3) and the inner cover plate (2) are fixed by a connecting screw (4) that passes through the adapter through hole (11) and the countersunk hole (9) in sequence and is then screwed into the rivet nut (6).

2. The protective cover plate connection structure according to claim 1, characterized in that, An adapter spring washer (5) is provided between the adapter screw (4) and the adapter through hole (11).

3. The protective cover plate connection structure according to claim 1, characterized in that, The chamfer angle of the outer end of the countersunk hole (9) is 120 degrees.

4. The protective cover plate connection structure according to claim 1, characterized in that, The end of the rivet nut (6) is designed to be countersunk.

5. The protective cover plate connection structure according to claim 1, characterized in that, An inner cover plate spring washer (13) is provided between the connecting screw (7) and the inner cover plate through hole (10).

6. The protective cover plate connection structure according to claim 1, characterized in that, Both the inner cover plate (2) and the outer cover plate (3) are aluminum alloy sheet structures.

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