Connecting device, composite sandwich plate, aircraft wing plate and connecting method

Abstract

The invention belongs to the technical field of aeronautical material structure design, and discloses a connecting device, a composite sandwich plate, an aircraft wing plate and a connecting method. According to the connecting device, the linings directly penetrate through the first through holes and the second through holes in the first wall plate and the second wall plate to achieve preliminary positioning, the problem that in the prior art, due to the fact that two linings need to be aligned, the positioning and aligning difficulty is large is solved, in addition, the second connecting parts of the fixing pieces are connected and matched with the first connecting grooves of the linings to provide fastening force, and the fixing effect is good. The first wall plate and the second wall plate are connected and clamped, the fixing piece does not need to penetrate through the two wall plates, and the problems that the connection strength of a large-thickness plate core area cannot be guaranteed, and the collimation degree is difficult to guarantee are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aeronautical material structure design, and in particular to a connecting device, a composite sandwich panel, an aircraft wing panel and a connecting method. BACKGROUND

[0002] The sandwich structure mainly includes three parts of a panel, a core and an adhesive, has the characteristics of high strength and light weight, and has excellent heat insulation and sound insulation performance, and is often used in key components such as the control surface, the fuselage, the wing and the tail wall of the aircraft. The sandwich structure includes a core area and a panel area, the core area has two panels and a core between the panels, and the panel area has two panels. Since the core area is prone to local tensile extrusion damage under concentrated load, and the panel area without the core can better withstand concentrated load, the mechanical connection between the sandwich structures is often concentrated in the panel area, but some characteristic scenarios, such as component / part function requirements, weight requirements, space limitations, manufacturing capacity limitations, etc. have to adopt the design scheme of mechanical connection concentrated in the core area.

[0003] In the prior art, for the connection of the core area of the sandwich structure, holes are made in the core areas of two sandwich structures, then bushings are respectively installed in the holes of the two sandwich structures, and finally the two bushings are aligned and a bolt is used to pass through the two bushings to achieve connection. Since the thickness of the core area is large, the connection strength of the ordinary market bolt may not meet the requirements, and the positioning and alignment of the two bushings in the alignment process are difficult and the alignment accuracy is difficult to guarantee. SUMMARY

[0004] The purpose of the present application is to provide a connecting device, a composite sandwich panel, an aircraft wing panel and a connecting method, which can solve the problem of large risk of positioning and alignment difficulty in connecting two sandwich structures, and also solve the problem of no suitable bolt selection for large-thickness core area.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] A connecting device for connecting a first wall panel and a second wall panel, the first wall panel being provided with a first through hole, and the second wall panel being provided with a second through hole, the connecting device comprising:

[0007] a bushing comprising a first abutting portion and a first connecting portion connected to each other, the first abutting portion being arranged at one end of the first connecting portion, and the other end of the first connecting portion being recessed with a first connecting groove, the first connecting portion being capable of passing through the first through hole and the second through hole;

[0008] The fixing member comprises a second abutting portion and a second connecting portion connected with each other, the second abutting portion is arranged at one end of the second connecting portion, the second connecting portion can pass through the second through hole and be connected with the first connecting groove, and the first abutting portion and the second abutting portion can apply force to the first wall plate and the second wall plate respectively so that the first wall plate and the second wall plate are connected together.

[0009] Preferably, the first through hole comprises a first accommodating hole and a first countersunk hole connected with each other, the first countersunk hole is arranged at one end of the first accommodating hole, the second through hole comprises a second accommodating hole and a second countersunk hole connected with each other, the second countersunk hole is arranged at one end of the second accommodating hole, the first abutting portion can be arranged in the first countersunk hole, and the second abutting portion can be arranged in the second countersunk hole.

[0010] Preferably, the connecting device further comprises a cup-shaped member, the cup-shaped member comprises a shoulder and a supporting ring portion, the cup-shaped member is arranged in the second through hole, the shoulder abuts against an end face of the second wall plate close to the second countersunk hole, and the supporting ring portion is at least partially protruded from one side of the second countersunk hole close to the second accommodating hole.

[0011] Preferably, the fixing member is threadedly connected with the first connecting groove.

[0012] Preferably, an adhesive is arranged between the bushing and the first through hole and the second through hole.

[0013] Preferably, a second connecting groove is recessed on the first abutting portion, the second connecting groove can be matched with a connecting member on an external device to prevent the bushing from rotating by itself.

[0014] A composite sandwich plate member, comprising a first wall plate, a second wall plate and the connecting device, the first wall plate and the second wall plate are connected by the connecting device.

[0015] Preferably, the first wall plate comprises a wedge-shaped region, two end faces of the first wall plate and the second wall plate, which are away from each other after being connected, are arranged at an angle in the wedge-shaped region, and an end face of the first abutting portion is arranged obliquely so that the end face of the first abutting portion can be flush with the end face of the first wall plate.

[0016] An aircraft wing plate, comprising the composite sandwich plate member.

[0017] A connecting method, using the connecting device, comprising the following steps:

[0018] S1, a first through hole is arranged on a region to be connected of a first wall plate, and a second through hole is arranged on a region to be connected of a second wall plate;

[0019] S2. Contact the end surfaces of the first wall plate with the second wall plate, align the first through hole with the second through hole, and place the bushing in the first through hole and the second through hole;

[0020] S3. Place the fixing member in the second through hole and connect it to the first connecting groove.

[0021] Beneficial effects of the present invention:

[0022] The present invention provides a connecting device for connecting a first wall panel and a second wall panel, wherein the first wall panel is provided with a first through hole and the second wall panel is provided with a second through hole. The connecting device comprises: a bushing and a fixing member, the bushing comprising a first abutting portion and a first connecting portion connected to each other, the first abutting portion being provided at one end of the first connecting portion, the first connecting portion being provided with a first connecting groove at the other end, the first connecting portion being capable of passing through the first through hole and the second through hole, the fixing member comprising a second abutting portion and a second connecting portion connected to each other, the second abutting portion being provided at one end of the second connecting portion, the second connecting portion being capable of passing through the second through hole and connected to the first connecting groove, the first abutting portion and the second abutting portion being capable of respectively applying force to the first wall panel and the second wall panel so as to connect the first wall panel and the second wall panel together. The bushing and the fixing member are connected by the first connecting groove and the second connecting portion on the first connecting portion, and an axial tension is generated during the connection process of the first connecting groove and the second connecting portion, causing the first abutting portion and the second abutting portion to approach each other, at which time the first abutting portion and the second abutting portion respectively apply force to the first wall panel and the second wall panel so as to connect the first wall panel and the second wall panel together. This device uses a bushing to directly penetrate the first through hole and the second through hole on the first wall panel and the second wall panel to achieve preliminary positioning, which solves the problem of difficulty in positioning and alignment caused by the need to align two bushings in the prior art. In addition, the second connecting portion of the fixing piece cooperates with the first connecting groove of the bushing to provide a fastening force to connect and clamp the first wall panel and the second wall panel. The fixing piece does not need to penetrate the two wall panels, which also solves the problem of insufficient connection strength in the core area of ​​the thick plate and difficulty in ensuring alignment.

[0023] The present invention also provides a composite sandwich panel, comprising a first wall panel, a second wall panel and the above-mentioned connecting device, and having high strength.

[0024] The present invention also provides an aircraft wing panel, comprising the above-mentioned composite sandwich panel, which has high strength.

[0025] The present invention also provides a connection method which uses the above connection device and has higher connection efficiency and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of the composite sandwich panel proposed in the present invention;

[0027] Figure 2 is Figure 1 is a local enlarged view of A in the middle of the figure;

[0028] Figure 3 is a structural schematic view of the first wall plate and the second wall plate according to the present application;

[0029] Figure 4 is a structural schematic view of the bushing according to the present application;

[0030] Figure 5 is a sectional view of the bushing according to the present application;

[0031] Figure 6 is a structural schematic view of the cup-shaped part according to the present application.

[0032] in the figure:

[0033] 1, first wall plate; 11, first counterbore; 12, first accommodating hole; 2, second wall plate; 21, second counterbore; 22, second accommodating hole; 3, bushing; 31, first abutting portion; 311, second connecting groove; 32, first connecting portion; 321, first connecting groove; 4, fixing member; 41, second abutting portion; 42, second connecting portion; 5, cup-shaped part; 51, shoulder; 52, support ring portion; 521, third through hole. DETAILED DESCRIPTION

[0034] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0035] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0037] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] The structure of the connecting device in the present embodiment will be described below with reference to Figures 1 to 6

[0039] In the present embodiment, the first wallboard 1 and the second wallboard 2 are both sandwich structures, and the connecting device mainly connects the core areas of the first wallboard 1 and the second wallboard 2 when connecting the first wallboard 1 and the second wallboard 2, wherein the to-be-connected areas of the first wallboard 1 and the second wallboard 2 are the core areas.

[0040] Referring to Figure 1 and Figure 2 ​The embodiment provides a connecting device for connecting a first wallboard 1 and a second wallboard 2, the first wallboard 1 is provided with a first through hole, the second wallboard 2 is provided with a second through hole, and the connecting device comprises a bushing 3 and a fixing piece 4. The bushing 3 comprises a first abutting part 31 and a first connecting part 32 which are connected to each other, the first abutting part 31 is arranged at one end of the first connecting part 32, the other end of the first connecting part 32 is recessed with a first connecting groove 321, the first connecting part 32 can pass through the first through hole and the second through hole, the fixing piece 4 comprises a second abutting part 41 and a second connecting part 42 which are connected to each other, the second abutting part 41 is arranged at one end of the second connecting part 42, the second connecting part 42 can pass through the second through hole and be connected with the first connecting groove 321, and the first abutting part 31 and the second abutting part 41 can respectively apply force to the first wallboard 1 and the second wallboard 2 so that the first wallboard 1 and the second wallboard 2 are connected together. The bushing 3 and the fixing piece 4 are connected by the first connecting groove 321 on the first connecting part 32 and the second connecting part 42, axial tension is generated in the connecting process of the first connecting groove 321 and the second connecting part 42, so that the first abutting part 31 and the second abutting part 41 are close to each other, at this time, the first abutting part 31 and the second abutting part 41 respectively apply force to the first wallboard 1 and the second wallboard 2 so that the first wallboard 1 and the second wallboard 2 are connected together. The device directly passes through the first through hole and the second through hole on the first wallboard 1 and the second wallboard 2 by the bushing 3 to realize preliminary positioning, solves the problem that positioning alignment is difficult in the prior art due to the need to align two bushings 3, in addition, the second connecting part 42 of the fixing piece 4 is connected and matched with the first connecting groove 321 of the bushing 3 to provide fastening force, the first wallboard 1 and the second wallboard 2 are connected and clamped, the fixing piece 4 does not need to pass through two wallboards, and the problems that the connection strength of a large-thickness plate core area cannot be guaranteed and the collimation degree is difficult to guarantee are solved.

[0041] When two wallboards are connected in the prior art, the bushings 3 on the two wallboards need to be accurately aligned, otherwise any hole position deviation (such as manufacturing tolerance or installation error) will cause the bolt to be stuck or unable to be inserted, that is, there are problems of difficult positioning alignment and difficult to guarantee collimation degree, and since the thickness of the plate core area is large, the bolt directly passing through the two wallboards will have the problem that the connection strength cannot be guaranteed. In the embodiment, the first connecting part 32 of the bushing 3 directly passes through the first through hole and the second through hole, the need for synchronous alignment of the two bushings 3 is eliminated, the positioning alignment difficulty is reduced, then the second connecting part 42 of the fixing piece 4 only passes through the second through hole and is connected and matched with the first connecting groove 321 of the bushing 3, the axial axis offset cumulative error when the long bolt penetrates through the two wallboards is avoided, and the collimation degree is guaranteed.

[0042] In addition, since the bushing 3 and the fixing member 4 are connected by the first connecting groove 321 on the first connecting part 32 and the second connecting part 42, axial tension is generated during the connecting process of the first connecting groove 321 and the second connecting part 42, so that the first abutting part 31 and the second abutting part 41 are close to each other, and further, the connecting device is also applicable to the connection between the first wall plate 1 and the second wall plate 2 with different thicknesses within a certain range. When the thicknesses of the first wall plate 1 and the second wall plate 2 are large, the connecting degree of the first connecting groove 321 and the second connecting part 42 is shallow, and when the thicknesses of the first wall plate 1 and the second wall plate 2 are small, the connecting degree of the first connecting groove 321 and the second connecting part 42 is deep.

[0043] Further, referring to Figure 3 , the first through hole includes the first accommodating hole 12 and the first countersunk hole 11 which are in communication with each other, the first countersunk hole 11 is located at one end of the first accommodating hole 12, the second through hole includes the second accommodating hole 22 and the second countersunk hole 21 which are in communication with each other, the second countersunk hole 21 is located at one end of the second accommodating hole 22, the first abutting part 31 can be accommodated in the first countersunk hole 11, and the second abutting part 41 can be accommodated in the second countersunk hole 21. When the bushing 3 is inserted into the first through hole and the second through hole, the first abutting part 31 is accommodated in the first countersunk hole 11, and the first abutting part 31 will not protrude on the surface of the first wall plate 1, so as to ensure the flatness of the surface of the first wall plate 1. Similarly, when the fixing member 4 is inserted into the second through hole, the second abutting part 41 is accommodated in the second countersunk hole 21, and the second abutting part 41 will not protrude on the surface of the second wall plate 2, so as to ensure the flatness of the surface of the second wall plate 2, improve the aesthetic appearance of the product, avoid the risk of stress concentration caused by protrusions, prevent fatigue cracks caused by local high stress points, and prolong the service life of the first wall plate 1 and the second wall plate 2.

[0044] It is worth mentioning that the first countersunk hole 11 can be a tapered hole, the small diameter end of the tapered hole is connected with the first accommodating hole 12, the maximum diameter of the tapered hole is larger than the diameter of the first accommodating hole 12, which is convenient for the insertion of the bushing 3, and the shape of the first abutting portion 31 matches the shape of the tapered hole, so that the cooperation of the bushing 3 and the first through hole is more stable; similarly, the second countersunk hole 21 can also be a tapered hole, the small diameter end of the tapered hole is connected with the second accommodating hole 22, the maximum diameter of the tapered hole is larger than the diameter of the second accommodating hole 22, which is convenient for the insertion of the bushing 3, and the shape of the second abutting portion 41 of the tapered hole matches the shape of the tapered hole, so that the cooperation of the bushing 3 and the second through hole is more stable. In other embodiments, the first countersunk hole 11 can also be a straight hole, the diameter of the straight hole is larger than the diameter of the first accommodating hole 12, that is, the first countersunk hole 11 and the first accommodating hole 12 form a stepped hole; the second countersunk hole 21 can also be a straight hole, the diameter of the straight hole is larger than the diameter of the second accommodating hole 22, that is, the second countersunk hole 21 and the second accommodating hole 22 form a stepped hole. Of course, in more embodiments, the first countersunk hole 11 and the second countersunk hole 21 can be one tapered hole and the other straight hole.

[0045] Further, with reference to Figure 2 and Figure 6 , the connecting device further comprises a cup-shaped piece 5, the cup-shaped piece 5 comprises a shoulder 51 and a support ring portion 52, the cup-shaped piece 5 is placed in the second countersunk hole 21, the shoulder 51 abuts against the end face of the second wall plate 2 close to the second countersunk hole 21, and the support ring portion 52 is at least partially protruded from one side of the second countersunk hole 21 close to the second accommodating hole 22. The cup-shaped piece 5 is placed in the second through hole by abutting against the second wall plate 2 through the shoulder 51, further, the support ring portion 52 is provided with a third through hole 521, the second connecting portion 42 of the fixing piece 4 can pass through the third through hole 521, and the second abutting portion 41 abuts against the inner wall of the support ring portion 52, which avoids the fixing piece 4 directly applying load to the hole wall of the second through hole (especially the transition between the second countersunk hole 21 and the second accommodating hole 22), converts the potential "line contact" or "small area contact" into more uniform "surface contact" between the cup-shaped piece 5 and the hole wall of the countersunk hole, improves the bearing capacity, effectively protects the second wall plate 2, prevents the second wall plate 2 from being locally crushed, delaminated or permanently deformed, in addition, the support ring portion 52 is at least partially protruded from one side of the second countersunk hole 21 close to the second accommodating hole 22, on the one hand, it can prevent the support ring portion 52 from not being able to completely cover the hole wall of the second countersunk hole 21, so that the second abutting portion 41 is pressed against the hole wall of the second countersunk hole 21, thereby causing damage, on the other hand, when the bushing 3 and the fixing piece 4 are connected to a relatively deep degree, the second abutting portion 41 of the fixing piece 4 will protrude from the second countersunk hole 21 to the direction of the second accommodating hole 22, at this time, the support ring portion 52 is at least partially protruded from one side of the second countersunk hole 21 close to the second accommodating hole 22, which can further provide support and guidance for the second abutting portion 41.

[0046] The fixing member 4 is threadedly connected with the first connecting groove 321. Specifically, the groove wall of the second connecting groove 311 is provided with threads, and the second connecting portion 42 of the fixing member 4 is also provided with threads correspondingly. The connection between the fixing member 4 and the bushing 3 can be realized by screwing the second connecting portion 42 into the first connecting groove 321. The screwing process of the threads on the second connecting portion 42 can convert the rotational torque into an axial pre-tightening force, clamping the first wall plate 1 and the second wall plate 2. The operation is simple. In addition, the threaded connection is a non-permanent connection, and the fixing member 4 can be disassembled by reverse rotation, without damaging the wall plates.

[0047] In some embodiments, an adhesive is provided between the bushing 3 and the first through hole. In other embodiments, an adhesive is provided between the bushing 3 and the second through hole. In this embodiment, an adhesive is provided between the bushing 3 and the first through hole and the second through hole. It can be understood that the adhesive can have a pre-fixing effect on the installation of the bushing 3, and the adhesive can also eliminate the micro gaps between the bushing 3 and the hole walls of the first through hole and the second through hole, inhibit the fretting damage under the vibration working condition, and improve the fatigue life.

[0048] Further, the first abutting portion 31 is also recessed with a second connecting groove 311, which can cooperate with the connecting member on the external equipment to prevent the bushing 3 from rotating by itself. Specifically, during the disassembly or installation of the fixing member 4, in order to prevent the bushing 3 from rotating by itself and affecting the disassembly or installation process of the fixing member 4, the second connecting groove 311 is recessed on the first abutting portion 31, and then the connecting member on the external equipment can be inserted into the second connecting groove 311 to stop the bushing 3, preventing the bushing 3 from rotating by itself. The second connecting groove 311 can be a groove with edges. Of course, since the bushing 3 is provided with an adhesive between the first through hole and the second through hole, in other embodiments, the bushing 3 can not be connected with the external equipment, and at this time, the first abutting portion 31 can not be provided with the second connecting groove 311, but directly provided with a protrusion.

[0049] This embodiment also proposes a composite sandwich plate, which comprises a first wall plate 1, a second wall plate 2 and the above-mentioned connecting device. The first wall plate 1 and the second wall plate 2 are connected by the connecting device, and have high strength. Referring to Figure 1 and Figure 3 The first wall plate 1 comprises a wedge-shaped area, and the extension surfaces of the two end faces on the first wall plate 1 in the wedge-shaped area are crosswise arranged. The axis of the first through hole needs to be arranged vertically to the end face close to the first accommodating hole 12, so as to ensure that the first connecting portion 32 of the bushing 3 can be smoothly arranged through the first through hole and the second through hole. In addition, the end face of the first abutting portion 31 of the bushing 3 is arranged obliquely, that is, the first abutting portion 31 and the axis of the first connecting portion 32 are arranged at a non-vertical angle, so that the end face of the first abutting portion 31 can be flush with the end face of the first wall plate 1.

[0050] The second wall plate 2 also comprises a wedge-shaped region, in which the extending surfaces of the two end faces on the second wall plate 2 are arranged to intersect, and the axis of the second through hole is arranged to be perpendicular to the end face close to the second accommodating hole 22, so as to ensure that the second connecting portion 42 of the fixing member 4 can be smoothly arranged through the second through hole, and in addition, the end face of the shoulder 51 of the cup-shaped member 5 is arranged to be inclined, that is, arranged to be at a non-perpendicular angle with the axis of the supporting ring portion 52, so that the end face of the shoulder 51 of the cup-shaped member 5 can be completely attached to the end face of the second wall plate 2.

[0051] In the embodiment, the first wall plate 1 and the second wall plate 2 both comprise a wedge-shaped region, and the connecting positions on the first wall plate 1 and the second wall plate 2 are both located in the wedge-shaped region. Of course, the first wall plate 1 and the second wall plate 2 also comprise a flat region, in which the extending surfaces of the two end faces on the first wall plate 1 are arranged to be parallel, and the extending surfaces of the two end faces on the second wall plate 2 are arranged to be parallel. In other embodiments, the connecting positions of the first wall plate 1 and the second wall plate 2 can also be in the flat region, at this time, the end face of the first abutting portion 31 of the bushing 3 is arranged to be perpendicular to the axis of the first connecting portion 32, and the end face of the shoulder 51 of the cup-shaped member 5 is arranged to be perpendicular to the axis of the supporting ring portion 52. In more embodiments, the connecting position on the first wall plate 1 can be in the wedge-shaped region, and the connecting position on the second wall plate 2 can be in the flat region.

[0052] Optionally, the bushing 3 and the cup-shaped member 5 can both be special metal pieces formed by machining, and a worker can manufacture appropriate bushings 3 and cup-shaped members 5 according to the specific regions of the connecting positions of the first wall plate 1 and the second wall plate 2, and the fixing member 4 can be a countersunk bolt.

[0053] The embodiment also proposes an aircraft wing plate, which comprises the composite sandwich plate described above. The aircraft wing plate made of the composite sandwich plate described above has high strength, and thus the wings and tail of the aircraft can better withstand various loads encountered during the flight of the aircraft, including lift, thrust, resistance and additional stress caused by changes in airflow, to ensure the stability and safety of the aircraft under various flight conditions.

[0054] The embodiment also proposes a connecting method, which adopts the connecting device described above and has high connecting efficiency and stability. The connecting method comprises the following steps: S1, a first through hole is formed on the to-be-connected region of the first wall plate 1, and a second through hole is formed on the to-be-connected region of the second wall plate 2; S2, the end faces of the first wall plate 1 and the second wall plate 2 are brought into contact, the first through hole and the second through hole are aligned, and the bushing 3 is placed in the first through hole and the second through hole; S3, the fixing member 4 is placed in the second through hole and connected with the first connecting groove 321.

[0055] Specifically, in step S1, when the first through hole is formed on the to-be-connected region of the first wallboard 1, first, a first accommodating hole 12 is formed on the to-be-connected region of the first wallboard 1, then a first countersunk hole 11 is formed by counter sinking one end of the first accommodating hole 12, and when the second through hole is formed on the to-be-connected region of the second wallboard 2, first, a second accommodating hole 22 is formed on the to-be-connected region of the second wallboard 2, then a second countersunk hole 21 is formed by counter sinking one end of the second accommodating hole 22.

[0056] Further, in step S2, when the end faces of the first wallboard 1 and the second wallboard 2 are in contact, the first countersunk hole 11 and the second countersunk hole 21 are respectively located on the side away from each other of the first wallboard 1 and the second wallboard 2.

[0057] In step S3, before the fixing member 4 is placed in the second through hole, the cup-shaped member 5 is placed in the second countersunk hole 21. Further, when the fixing member 4 is placed in the second through hole, the second connecting part 42 specifically penetrates the third through hole 521 on the cup-shaped member 5, and the second abutting part 41 abuts against the inner wall of the supporting ring part 52.

[0058] Before step S1, further comprising: preparing the first wallboard 1 and the second wallboard 2. Specifically, first, a sandwich is obtained by performing partial strengthening treatment on a sandwich material, then panels are pasted on both sides of the sandwich, and then hot-pressing pot co-curing is performed to obtain the first wallboard 1 and the second wallboard 2. The to-be-connected regions of the first wallboard 1 and the second wallboard 2 are located at the positions of the sandwich after the strengthening treatment, that is, the board core area, so as to improve the connection strength.

[0059] Further, the sandwich material can be injected with potting material, and after the sandwich material is cured, the potting area and the non-potting area are processed to be flush with the surface, to obtain a sandwich, and then panels are pasted on both sides of the sandwich. If the sandwich material is a honeycomb core, the potting material can be directly injected. If the sandwich material is a foam core, the potting space can be reserved first, and then the potting material is injected. In other embodiments, the sandwich material can also be strengthened by installing a composite reinforcing block in the sandwich material. A space is reserved on the sandwich material, the reinforcing block is placed in the reserved space, and the gap is filled with foaming glue, so as to obtain a sandwich, and then panels are pasted on both sides of the sandwich. The composite reinforcing block can be a carbon fiber block or a glass fiber block.

[0060] Obviously, the above embodiments of the present application are only examples for clear illustration of the present application, and are not intended to limit the embodiments of the present application. Those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the protection scope of the present application. It is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A connecting device, characterized in that: The connecting device is used to connect a first wall plate (1) and a second wall plate (2), wherein the first wall plate (1) is provided with a first through hole, and the second wall plate (2) is provided with a second through hole, and the connecting device comprises: A bushing (3), the bushing (3) comprising a first abutting portion (31) and a first connecting portion (32) connected to each other, the first abutting portion (31) being arranged at one end of the first connecting portion (32), the other end of the first connecting portion (32) being recessed with a first connecting groove (321), and the first connecting portion (32) being capable of penetrating the first through hole and the second through hole; A fixing member (4), the fixing member (4) comprising a second abutting portion (41) and a second connecting portion (42) connected to each other, the second abutting portion (41) being arranged at one end of the second connecting portion (42), the second connecting portion (42) being capable of passing through the second through hole and being connected to the first connecting groove (321), the first abutting portion (31) and the second abutting portion (41) being capable of applying force to the first wall panel (1) and the second wall panel (2) respectively so that the first wall panel (1) and the second wall panel (2) are connected together.

2. The connecting device according to claim 1, characterized in that The first through hole comprises a first accommodating hole (12) and a first countersunk hole (11) that are interconnected, the first countersunk hole (11) being located at one end of the first accommodating hole (12), the second through hole comprises a second accommodating hole (22) and a second countersunk hole (21) that are interconnected, the second countersunk hole (21) being located at one end of the second accommodating hole (22), the first abutting portion (31) being capable of being placed in the first countersunk hole (11), and the second abutting portion (41) being capable of being placed in the second countersunk hole (21).

3. The connection device according to claim 2, characterized in that The connecting device further comprises a cup-shaped member (5), the cup-shaped member (5) comprising a stop shoulder (51) and a support ring portion (52), the cup-shaped member (5) being placed in the second through hole, the stop shoulder (51) being in contact with the end face of the second wall plate (2) close to the second countersunk hole (21), and the support ring portion (52) being at least partially protruding from a side of the second countersunk hole (21) close to the second receiving hole (22).

4. The connecting device according to any one of claims 1 to 3, characterized in that: The fixing member (4) is threadably connected to the first connecting groove (321).

5. The connecting device according to any one of claims 1 to 3, characterized in that: Adhesive is provided between the bushing (3) and the first through hole and the second through hole.

6. The connecting device according to any one of claims 1 to 3, characterized in that: A second connecting groove (311) is recessed on the first abutting portion (31), and the second connecting groove (311) can cooperate with a connecting piece on an external device to prevent the bushing (3) from rotating along itself.

7. A composite sandwich panel, characterized in that: The invention comprises a first wall panel (1), a second wall panel (2) and a connecting device according to any one of claims 1 to 6, wherein the first wall panel (1) and the second wall panel (2) are connected via the connecting device.

8. The composite sandwich panel according to claim 7, wherein: The first wall plate (1) includes a wedge-shaped area, in which the extension surfaces of the two end surfaces of the first wall plate (1) are arranged crosswise, and the end surface of the first abutting portion (31) is arranged inclined so that when the first connecting portion (32) passes through the first through hole, the end surface of the first abutting portion (31) can be flush with the end surface of the first wall plate (1).

9. Aircraft wing panel, characterized in that: Comprising the composite sandwich panel according to any one of claims 7-8.

10. A connection method, characterized in that: The connecting device according to any one of claims 1 to 6 comprises the following steps: S1, opening a first through hole in the area to be connected of the first wall plate (1), and opening a second through hole in the area to be connected of the second wall plate (2); S2, bringing the end faces of the first wall plate (1) into contact with the end faces of the second wall plate (2), aligning the first through hole with the second through hole, and placing the bushing (3) in the first through hole and the second through hole; S3. Place the fixing member (4) in the second through hole and connect it to the first connecting groove (321).

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