Connecting mechanism and connecting piece for realizing double-layer parallel or non-parallel plane and curved surface

Abstract

The invention provides a connecting mechanism and a connecting piece for realizing double-layer parallel or non-parallel planes and curved surfaces, and the connecting mechanism comprises the connecting piece which is provided with a main body part, and a first end part and a second end part which are far away from each other; the first plate is connected to the first end part; the second plate is connected to the second end part; the outer diameter of the first end and the outer diameter of the second end are smaller than the outer diameter of the body part, the first end extends towards the direction where the first plate is located to abut against an inner wall material of the first plate, and the second end extends towards the direction where the second plate is located to abut against an inner wall material of the second plate. According to the invention, the first end part and the second end part are respectively provided with the flower tooth part, or one of the first end part and the second end part is provided with the flower tooth part, so that the first plate and / or the second plate can be in interference connection.

Description

Technical Field

[0001] The present application belongs to the technical field of connectors, and in particular, relates to a connecting mechanism and a connector for realizing double-layer parallel or non-parallel planes and curved surfaces. Background Art

[0002] In the industrial production equipment in the prior art, it is very common to design the corresponding parts of the product to have a double-layer plate structure due to functional requirements. For example, many parts in the automobile structure need to have a double-layer structure locally. This double-layer structure sometimes does not have very stringent connection strength requirements, and some require easy installation. At present, the commonly used connection method in mechanical structures is usually to connect two parts using screws, bolts and other threaded connection methods. The above connection method, on the one hand, cooperates with thread locking, which is cumbersome to operate. On the other hand, it is necessary to open a through threaded hole or through hole on the component, especially on the larger component, for the screws, bolts and other connecting parts to pass through. When the sealing requirements are relatively high, the setting of the through threaded hole or through hole will destroy the integrity of the seal and cause instability in the operation of the overall component.

[0003] To address the above problems, no effective solution has been proposed yet.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0005] The purpose of the present application is to provide a connection mechanism and a connection member for realizing double-layer parallel or non-parallel planes and curved surfaces, so as to solve the above problems.

[0006] The present application provides a connection mechanism for realizing double-layer parallel or non-parallel planes and curved surfaces, comprising:

[0007] A connecting member, the connecting member having a main body, and a first end and a second end that are far away from each other;

[0008] a first plate connected to the first end;

[0009] a second plate connected to the second end;

[0010] Wherein, the outer diameters of the first end and the second end are smaller than the outer diameter of the main body, the first end extends toward the direction where the first plate is located until it conflicts with the inner wall material of the first plate, and the second end extends toward the direction where the second plate is located until it conflicts with the inner wall material of the second plate;

[0011] The plane where the first plate is located is separated from the plane where the second plate is located, or the first plate and the second plate are in a curved surface.

[0012] Preferably, the outer wall of the first end portion or / and the second end portion is provided with a toothed portion, and the first end portion is inserted into the first plate so that the first end portion and the first plate portion are interference connected, or / and the second end portion is inserted into the second plate so that the second end portion and the second plate portion are interference connected.

[0013] Preferably, the outer wall of the first end portion or / and the second end portion is provided with a riveted portion and a receiving groove, and the riveted portion is arranged adjacent to the receiving groove.

[0014] The riveted portion on the first end is riveted to the first plate, or / and the riveted portion on the second end is riveted to the second plate; the first end is inserted into the first plate, or / and the second end is inserted into the second plate.

[0015] Preferably, the first end passes through the first plate, and the first end is riveted to the first plate; or / and the second end passes through the second plate, and the second end is riveted to the second plate.

[0016] Preferably, the first plate is parallel to the second plate.

[0017] Preferably, the first plate and the second plate are both curved plate.

[0018] A connecting piece, comprising:

[0019] Main body;

[0020] A first end portion and a second end portion distributed at two ends of the main body portion;

[0021] The outer diameters of the first end and the second end are smaller than the outer diameter of the main body.

[0022] Preferably, a toothed portion is provided on the outer wall of the first end portion and / or the second end portion for interference connection of the plate.

[0023] Preferably, the first end portion and / or the second end portion is provided with a riveting portion and a receiving groove, the riveting portion is used for performing pressure riveting connection on the plate, and the receiving groove is used for accommodating the material of the plate.

[0024] Preferably, the first end portion and / or the second end portion is provided with an inclined portion, and the inclined portion passes through the plate material for riveting the plate material.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention can perform interference connection on the first plate and / or the second plate by arranging that both the first end and the second end have a toothed portion, or one of the first end and the second end has a toothed portion.

[0027] 2. The present invention can provide a riveted portion and a receiving groove on both the first end and the second end, or a riveted portion and a receiving groove on the first end or the second end, so as to realize a press riveted connection between the first plate and the second plate and the first end and the second end respectively, or a press riveted connection between the first plate and the first end, or a press riveted connection between the second plate and the second end.

[0028] 3. The present invention provides a bevel portion on the first end or the second end, so that the first end can be riveted to the first plate or the second end can be riveted to the second plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 This is an overall structural diagram of a connection mechanism and a connection member for realizing double-layer parallel or non-parallel planes and curved surfaces provided by an embodiment of the present application;

[0031] Figure 2 This is a plate installation diagram of a connection mechanism and a connection piece for realizing double-layer parallel or non-parallel planes and curved surfaces provided in an embodiment of the present application;

[0032] Figure 3 This is a structural diagram of a first protruding portion and a second protruding portion of a connecting member for realizing a connection mechanism for double-layer parallel or non-parallel planes and curved surfaces, as well as a diagram of a structure of a first protruding portion and a second protruding portion of a connecting member provided in an embodiment of the present application;

[0033] Figure 4 This is a diagram of an interference connection structure of a connection mechanism and a connection piece for realizing double-layer parallel or non-parallel planes and curved surfaces provided by an embodiment of the present application;

[0034] Figure 5 This is a diagram of a riveting connection structure of a connection mechanism and a connecting piece for realizing double-layer parallel or non-parallel planes and curved surfaces provided in an embodiment of the present application;

[0035] Figure 6This is a riveting connection structure diagram of a connection mechanism for realizing double-layer parallel or non-parallel planes and curved surfaces and a connecting piece provided in an embodiment of the present application;

[0036] Figure 7 This is a diagram of a curved plate connection structure of a connection mechanism and a connecting member for realizing double-layer parallel or non-parallel planes and curved surfaces provided in an embodiment of the present application.

[0037] In the figure: 1, connecting member; 11, main body; 12, first end; 13, second end; 14, toothed portion; 15, riveted portion; 16, receiving groove; 17, inclined portion; 18, first protruding portion; 19, second protruding portion; 2, first plate; 3, second plate. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0039] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "middle", "lower", "inner", "outer", "front", "back", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes an implementation method of the present invention based on its overall structure.

[0040] Reference Figure 1 As shown, the embodiment of the present application provides a connection mechanism for realizing double-layer parallel or non-parallel planes and curved surfaces, including:

[0041] A connecting member 1, the connecting member 1 having a main body 11, and a first end 12 and a second end 13 that are far away from each other;

[0042] A first plate 2 connected to the first end portion 12;

[0043] A second plate 3 connected to the second end portion 13;

[0044] The outer diameters of the first end portion 12 and the second end portion 13 are smaller than the outer diameter of the main body portion 11 , the first end portion 12 extends toward the direction of the first plate 2 until it conflicts with the inner wall material of the first plate 2 , and the second end portion 12 extends toward the direction of the second plate 3 until it conflicts with the inner wall material of the second plate 3 ;

[0045] The plane where the first plate 2 is located is separated from the plane where the second plate 3 is located, or the first plate 2 and the second plate 3 are in a curved surface.

[0046] according to Figure 1 Those skilled in the art may configure the connector 1 to have a main body 11 , the main body 11 having a first end 12 and a second end 13 , wherein the first end 12 and the second end 13 are disposed at opposite ends of the main body 11 .

[0047] In the structure of the plate connection, those skilled in the art can install the first plate 2 and the second plate 3 on the first end 12 and the second end 13 respectively. Specifically, the first end 12 extends toward the direction where the first plate 2 is located until it conflicts with the inner wall material of the first plate 2, and the second end 13 extends toward the direction where the second plate 3 is located until it conflicts with the inner wall material of the second plate 3.

[0048] By means of the above structure, the first plate 2 and the second plate 3 can be connected via the first end 12 and the second end 13 of the connecting member 1, so that the first plate 2 and the second plate 3 can be fixedly connected.

[0049] In the above arrangement, those skilled in the art set the plane where the first plate 2 is located to be separated from the plane where the second plate 3 is located, that is, the plane where the first plate 2 is located and the plane where the second plate 3 is located can be connected by the first end 12 and the second end 13 whether they are parallel or not. Furthermore, those skilled in the art continue to set the planes where the first plate 2 and the second plate 3 are located to be curved surfaces.

[0050] In summary, those skilled in the art can connect the parallel or non-parallel or curved first plate 2 and second plate 3 through the first end 12 and the second end 13 of the main body 11 .

[0051] In one embodiment, preferably, the outer wall of the first end 12 and / or the second end 13 is provided with a toothed portion 14, and the first end 12 is inserted into the first plate 2 so that the first end 12 and the first plate 2 are interference connected or / and the second end 13 is inserted into the second plate 3 so that the second end 3 and the second plate 3 are interference connected.

[0052] In this embodiment, those skilled in the art may configure the first end portion 12 and the second end portion 13 to both have the toothed portion 14 , or configure one of the first end portion 12 and the second end portion 13 to have the toothed portion 14 .

[0053] It can be understood that in the above-mentioned embodiment, the first end portion 12 or the second end portion 13 provided with the spline portion 14 can be interference-connected with the material in the corresponding first plate 2 or second plate 3 through the spline portion 14 .

[0054] That is, if the first end 12 and the second end 13 are both provided with the toothed portion 14, the first end 12 and the second end 13 are respectively connected with the first plate 2 and the second plate 3 by interference. If the first end 12 or the second end 13 is provided with the toothed portion 14, the first end 12 is connected with the first plate 2 by interference, or the second end 13 is connected with the second plate 3 by interference.

[0055] To sum up, in this embodiment, the technicians in this field arrange that both the first end 12 and the second end 13 have a toothed portion 14, or one of the first end 12 and the second end 13 is provided with a toothed portion 14, so that the first plate 2 and / or the second plate 3 can be interference connected.

[0056] In an optional embodiment, the outer wall of the first end portion 12 or / and the second end portion 13 is provided with a riveted portion 15 and a receiving groove 16, and the riveted portion 15 and the receiving groove 16 are arranged adjacent to each other.

[0057] The riveted portion 15 on the first end portion 12 is riveted to the first plate 2 , or / and the riveted portion 15 on the second end portion 13 is riveted to the second plate 3 ; the first end portion 12 is inserted into the first plate 2 , or / and the second end portion 13 is inserted into the second plate 3 .

[0058] With the above structure, those skilled in the art can configure the first end 12 and the second end 13 to both have the rivet portion 15 and the receiving groove 16 , or the first end 12 or the second end 13 to have the rivet portion 15 and the receiving groove 16 .

[0059] It is understandable that in the above embodiment, the riveting portion 15 and the receiving groove 16 are provided on the first end 12 and / or the second end 13 so that riveting can be performed when the first end 12 and the first plate 2 and / or the second end 13 and the second plate 3 are connected.

[0060] Specifically, in the above-mentioned riveting process, the riveting portion 15 on the first end portion 12 extrude and deform the material on the first plate 2, and the extruded and deformed material on the first plate 2 flows into the receiving groove 16, thereby forming a mutually conflicting riveting structure, thereby realizing the riveting connection between the first end portion 12 and the first plate 2.

[0061] Further, in this embodiment, a person skilled in the art may configure the second end 13 to have a riveted portion 15 and a receiving groove 16, and the riveted portion 15 and the through groove 16 are arranged close to each other. According to the above-mentioned riveted connection between the first end 12 and the first plate 2, a riveted connection structure between the second end 13 and the second plate 3 can be obtained.

[0062] That is, in this embodiment, a person skilled in the art may arrange both the first end 12 and the second end 13 with a rivet portion 15 and a receiving groove 16, so as to achieve a press-riveted connection between the first end 12 and the first plate 2 and between the second end 13 and the second plate 3, or arrange both the first end 12 and the second end 13 with a rivet portion 15 and a receiving groove 16, so as to achieve a press-riveted connection between the first end 12 and the first plate 2 or between the second end 13 and the second plate 3.

[0063] To summarize, those skilled in the art can arrange that both the first end 12 and the second end 13 have a rivet portion 15 and a receiving groove 16, or the first end 12 or the second end 13 has a rivet portion 15 and a receiving groove 16, so as to achieve a press-riveted connection between the first plate 2 and the second plate 3 and the first end 12 and the second end 13 respectively, or a press-riveted connection between the first plate 2 and the first end 12 or a press-riveted connection between the second plate 3 and the second end 13.

[0064] It is understandable that in the above two embodiments, those skilled in the art set the first end 12 and / or the second end 13 to have a toothed portion 14, and set the first end 12 and / or the second end 13 to have a riveted portion 15 and a receiving groove 16. The first end 12 is inserted into the first plate 2 and the second end 13 is inserted into the second plate 3, and the first end 12 will not be inserted out of the side of the first plate 2 away from the second plate 3, and the second end 13 will not be inserted out of the side of the second plate 3 away from the first plate 2.

[0065] In another embodiment, preferably, the first end 12 passes through the first plate 2 and is riveted to the first plate; or / and the second end 13 passes through the second plate 3 and is riveted to the second plate 3.

[0066] With the above structure, those skilled in the art can arrange a riveting connection between the first end portion 12 and the first plate 2 or / and a riveting connection between the second end portion 13 and the second plate 3 .

[0067] Specifically, the first end portion 12 and / or the second end portion 13 is provided with an inclined portion 17. The inclined portion 17 can be used to rivet the first plate 2 or the second plate 3.

[0068] In the above arrangement, those skilled in the art may arrange that both the first end 12 and the second end 13 have an inclined portion 17. The inclined portion 17 on the first end 12 passes through the first plate 2 and contacts the side wall of the first plate 2 away from the second plate 3; the inclined portion 17 on the second end 13 passes through the second plate 3 and contacts the side wall of the second plate 3 away from the first plate 2.

[0069] In another setting, those skilled in the art may set the first end 12 or the second end 13 to have a bevel portion 17 so as to achieve a riveted connection between the first end 12 and the first plate 2 or a riveted connection between the second end 13 and the second plate 3 .

[0070] According to the above-mentioned embodiment, a person skilled in the art may provide a toothed portion 14 on the first end portion 12 and / or the second end portion 13, and provide a rivet portion 15 and a receiving groove 16 on the first end portion 12 and / or the second end portion 13, and provide a chamfered portion 17 on the first end portion 12 and / or the second end portion 13, so as to complete the connection between the first end portion 12 and the first plate 2 and / or the connection between the second end portion 13 and the second plate 3.

[0071] In the above embodiment, those skilled in the art can further set the first plate 2 and the second plate 3. Preferably, the first plate 2 is parallel to the second plate 3. That is, in the above embodiment, those skilled in the art can connect the first plate 2 and the second plate 3 which are parallel to each other through the first end 12 and the second end 13 of the main body 11.

[0072] In another embodiment, the first plate 2 and the second plate 3 are both curved plates. In this embodiment, the first plate 2 and the second plate 3 can be both curved plates, that is, the plane where the first plate 2 is located and the plane where the second plate 3 is located may not be parallel.

[0073] When a technician in this field sets the structure of the first plate 2 and the second plate 3, blind holes can be set on the first plate 2 and the second plate 3, so that the interference connection and riveting connection between the first plate 2 and the first end 12, and the interference connection and riveting connection between the second plate 3 and the second end 13 can be completed.

[0074] In another embodiment, through holes may be provided on the first plate 2 and the second plate 3 , and the first plate 2 and the first end 12 may be riveted together, and the second plate 3 and the second end 13 may be riveted together through the through holes.

[0075] At the position where the first end 12 and the second end 13 are connected, a person skilled in the art may arrange that both the first end 12 and the second end 13 have a step portion, and the step portions on the first end 12 and the second end 13 may be used to position the first end 12 during the connection with the first plate 2, and to position the second end 13 during the connection with the second plate 3.

[0076] In addition, the step portions provided on the first end portion 12 and the second end portion 13 can increase the contact area between the first plate 2, the second plate 3 and the connector 1. When the first plate 2 and the second plate 3 are subjected to external force, the step portions provided on the first end portion 12 and the second end portion 13 can bear part of the external force, thereby effectively reducing the deformation degree of the first plate 2 and the second plate 3.

[0077] In one embodiment, a first protrusion 18 protruding toward the first plate 2 is provided on the end surface of the first end 12 of the main body 11, and the hardness of the first protrusion 9 is greater than that of the first plate 2, so that the first protrusion 18 can be embedded in the first plate 2. A second protrusion 19 protruding toward the second plate 3 is provided on the end surface of the second end 13 of the main body 11, and the hardness of the second protrusion 19 is greater than that of the second plate 3, so that the second protrusion 19 can be embedded in the second plate 3. The above embodiment can further ensure the firmness of the connection between the first plate 2 and the second plate 3 and the connecting member 1, thereby ensuring the stability and safety of the overall connection mechanism for realizing double-layer parallel or non-parallel planes and curved surfaces during operation.

[0078] This specification also provides a connecting piece, including:

[0079] Main body 11;

[0080] A first end portion 12 and a second end portion 13 distributed at two ends of the main body portion 11;

[0081] The outer diameters of the first end portion 12 and the second end portion 13 are smaller than the outer diameter of the main body portion 11 .

[0082] The above structure provides a connector 1, which has a main body 11, and the main body 11 has a first end 12 and a second end 13. The outer diameters of the first end 12 and the second end 13 are smaller than the outer diameter of the main body 11, so that two plates can be connected through the first end 12 and the second end 13.

[0083] In one embodiment, preferably, a toothed portion 14 is provided on the outer wall of the first end portion 12 or / and the second end portion 13 for interference connection of the plate. In this embodiment, those skilled in the art may arrange that both the first end portion 12 and the second end portion 13 have the toothed portion 14, or one of the first end portion 12 and the second end portion 13 has the toothed portion 14.

[0084] It can be understood that, in the above-mentioned embodiment, the first end portion 12 or the second end portion 13 provided with the toothed portion 14 can be interference-connected with the material in the corresponding plate through the toothed portion 14 .

[0085] That is, if the first end 12 and the second end 13 are both provided with the toothed portion 14, the first end 12 and the second end 13 are respectively connected with the two plates by interference. If the first end 12 or the second end 13 is provided with the toothed portion 14, the first end 12 is connected with the corresponding plate by interference, or the second end 13 is connected with the corresponding plate by interference.

[0086] In another optional embodiment, the first end 12 and / or the second end 13 are provided with a riveted portion 15 and a receiving groove 16, the riveted portion 15 is used for press-riveting the plate, and the receiving groove 16 is used for accommodating the material of the plate.

[0087] With the above structure, those skilled in the art can configure the first end 12 and the second end 13 to both have the rivet portion 15 and the receiving groove 16 , or the first end 12 or the second end 13 to have the rivet portion 15 and the receiving groove 16 .

[0088] It is understandable that in the above embodiment, the riveting portion 15 and the receiving groove 16 are provided on the first end 12 and / or the second end 13, so that pressure riveting can be performed when connecting the first end 12 and the corresponding plate or / and the second end 13 and the corresponding plate.

[0089] Specifically, during the above-mentioned riveting process, the riveting portion 15 on the first end portion 12 squeezes and deforms the material on the corresponding plate, and the squeezed and deformed material on the corresponding plate flows into the receiving groove 16, thereby forming a mutually conflicting riveting structure, thereby achieving a riveting connection between the first end portion 12 and the corresponding plate. Further, it can be understood that the riveting portion 15 provided on the second end portion 13 has the same connection structure as the riveting portion 15 on the first end portion 12.

[0090] In the further setting of the connector 1 by those skilled in the art, preferably, the first end 12 and / or the second end 13 are provided with an inclined portion 17 , and the inclined portion 17 passes through the plate for riveting the plate.

[0091] In the above arrangement, those skilled in the art may arrange that both the first end 12 and the second end 13 have an inclined portion 17. The inclined portion 17 on the first end 12 passes through the corresponding plate and contacts the side wall of the corresponding plate; the inclined portion 17 on the second end 13 passes through the corresponding plate and contacts the side wall of the corresponding plate.

[0092] In another setting, those skilled in the art may set the first end 12 or the second end 13 to have a bevel portion 17, so as to achieve a riveted connection between the first end 12 and the corresponding plate or a riveted connection between the second end 13 and the corresponding plate.

[0093] Although different specific embodiments are mentioned in the content of this application, this application is not limited to the situations described in the industry standards or embodiments, etc. Some industry standards or slightly modified implementation plans based on the implementation of the custom methods or embodiments can also achieve the same, equivalent or similar, or predictable implementation effects after deformation of the above embodiments. The embodiments of data acquisition, processing, output, judgment methods, etc. after these modifications or deformations can still fall within the scope of the optional implementation plans of this application.

[0094] Although the present application has been described through embodiments, those skilled in the art will appreciate that there are many modifications and changes to the present application without departing from the spirit of the present application. It is intended that the attached embodiments include these modifications and changes without departing from the present application.

Claims

1. A connection mechanism for realizing double-layer parallel or non-parallel planes and curved surfaces, characterized in that: include: A connecting member, the connecting member having a main body, and a first end and a second end that are far away from each other; a first plate connected to the first end; a second plate connected to the second end; Wherein, the outer diameters of the first end and the second end are smaller than the outer diameter of the main body, the first end extends toward the direction where the first plate is located until it conflicts with the inner wall material of the first plate, and the second end extends toward the direction where the second plate is located until it conflicts with the inner wall material of the second plate; The plane where the first plate is located is separated from the plane where the second plate is located, or the first plate and the second plate are in a curved surface.

2. The connection mechanism for realizing double-layer parallel or non-parallel planes and curved surfaces according to claim 1, characterized in that: The outer wall of the first end and / or the second end is provided with a toothed portion, and the first end is inserted into the first plate so that the first end and the first plate are interference connected, or / and the second end is inserted into the second plate so that the second end and the second plate are interference connected.

3. The connection mechanism for realizing double-layer parallel or non-parallel planes and curved surfaces according to claim 1, characterized in that: The outer wall of the first end portion or / and the second end portion is provided with a riveted portion and a receiving groove, and the riveted portion is arranged adjacent to the receiving groove. The riveted portion on the first end is riveted to the first plate, or / and the riveted portion on the second end is riveted to the second plate; the first end is inserted into the first plate, or / and the second end is inserted into the second plate.

4. The connection mechanism for realizing double-layer parallel or non-parallel planes and curved surfaces according to claim 1, characterized in that: The first end passes through the first plate, and the first end is riveted to the first plate; or / and the second end passes through the second plate, and the second end is riveted to the second plate.

5. The connection mechanism for realizing double-layer parallel or non-parallel planes and curved surfaces according to claim 1, characterized in that: The first plate is parallel to the second plate.

6. The connection mechanism for realizing double-layer parallel or non-parallel planes and curved surfaces according to claim 1, characterized in that: The first plate and the second plate are both curved plate.

7. A connecting piece, characterized in that: include: Main body; A first end portion and a second end portion distributed at two ends of the main body portion; Wherein, the outer diameters of the first end portion and the second end portion are smaller than the outer diameter of the main body portion.

8. The connecting piece according to claim 7, characterized in that: A toothed portion is provided on the outer wall of the first end portion and / or the second end portion for interference connection of the plate.

9. The connecting piece according to claim 7, characterized in that: The first end portion and / or the second end portion is provided with a riveting portion and a receiving groove, the riveting portion is used for performing pressure riveting connection on the plate, and the receiving groove is used for accommodating the material of the plate.

10. The connecting piece according to claim 7, characterized in that: The first end portion and / or the second end portion is provided with an inclined portion, and the inclined portion passes through the plate to perform riveting connection on the plate.

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