A fixed buckle structure built in a 3D printing shell

Abstract

The utility model provides a kind of fixed buckle structure built-in 3D printing shell, including fixed card and hook, the fixed card integrated top wall and a pair of side wall extending downward from the top wall both ends, top wall is equipped with card slot, the lower end of both ends side wall extends to form mounting portion outside, and screw hole is equipped on mounting portion;The hook is composed of two hook bodies arranged in pairs, gap is equipped between two hook bodies, the distance between the outer side surface of two hook bodies is consistent with the width of card slot;The bottom of hook body is equipped with limit protruding portion outside, limit protruding portion is matched with the opening of card slot, and it is embedded in the inboard of card slot to limit the movement of fixed card along disassembly direction. Hook and fixed card can be integrally formed with shell in 3D printing process. The lower shell side wall is also equipped with cable sealing joint for cable lead-out.

Description

Technical Field

[0001] This utility model relates to the field of snap-fit ​​connection technology, and in particular to a fixing buckle structure built into a 3D printed shell. Background Technology

[0002] With the widespread application of 3D printing technology in electronic product development and structural prototype fabrication, 3D printed shells have gradually replaced traditional injection-molded shells for product packaging in the prototype stage. Compared to injection-molded structures, 3D printed shells have advantages such as flexible molding, shorter development cycles, and lower manufacturing costs, making them particularly suitable for applications requiring multiple specifications, small batches, or rapid iteration.

[0003] However, due to the differences in heat-melting properties, strength, and wall thickness uniformity of 3D printing materials, traditional fixing methods used for injection-molded shells are often difficult to apply directly to 3D printed shells. For example, ultrasonic welding requires specific materials and weld interfaces; the rough and uneven surface of 3D printing materials makes it difficult to achieve the required welding strength. Traditional snap-fit ​​structures have high requirements for dimensional accuracy and insertion force, and are prone to problems such as loosening or assembly damage due to printing errors. Simply relying on screws for locking, without a properly designed limiting structure, often leads to inaccurate shell fit, loosening, or even deformation, seriously affecting structural stability. In addition, some connecting structures need to be manufactured as independent parts before being assembled into the shell, increasing the number of parts and assembly complexity, which is detrimental to the overall consistency and standardization of the structure. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a fixing buckle structure built into a 3D printed shell. This structure can meet the structural connection requirements of the 3D printed shell, avoid the problem that traditional ultrasonic welding and other methods cannot be used for fixing due to material and process limitations. Through the reasonable setting of fixing clips and hooks, a reliable connection between the upper and lower shells of the 3D printed shell can be achieved, while taking into account the convenience of disassembly and assembly, reducing the number of connecting parts, improving assembly consistency, and having a structural interface suitable for cable sealing and outgoing.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a fixing buckle structure built into a 3D printed shell, including a fixing clip and a hook. The fixing clip is integrally formed and includes a top wall and a pair of side walls extending downward from both ends of the top wall. The top wall is provided with a slot, and the lower ends of the two side walls extend outward to form a mounting part, which is provided with screw holes. The hook is composed of two hook bodies arranged in pairs, with a gap between the two hook bodies. The distance between the outer surfaces of the two hook bodies is the same as the width of the slot. The bottom of the hook body is provided with a limiting protrusion extending outward. The limiting protrusion cooperates with the opening of the slot and is embedded inside the slot to restrict the movement of the fixing clip in the disassembly direction.

[0006] Furthermore, the fixing clip has two screw holes on its mounting part that engage with screws to fix it inside the lower shell of the 3D printed shell. The hook has two hooks that are symmetrically arranged on the inner wall of the upper shell of the 3D printed shell, corresponding to the fixing clip.

[0007] Furthermore, the length of the hook is shorter than the length of the slot of the fixing card; the outer contour of the limiting protrusion at the bottom of the hook is an approximately trapezoidal structure, and its bottom edge is basically the same as the width of the hook body. The limiting protrusion is provided with a beveled corner on the side facing the insertion direction, and the beveled corner cooperates with the edge of the slot to form an insertion channel.

[0008] Furthermore, the lower shell of the 3D printed outer shell is provided with an installation plate, and the installation plate has holes corresponding to the screw holes of the fixing card; the bottom of the lower shell is provided with an installation column structure, which is a cross-shaped distribution of reinforcing rib units, and a through hole is provided in the center; the screw passes through the screw hole of the fixing card and the through hole of the installation plate and finally inserts into the through hole.

[0009] Furthermore, cable outlets are provided on the two opposite side walls of the lower shell, and a cable sealing joint is provided on each cable outlet.

[0010] The beneficial effects of this utility model are:

[0011] This utility model achieves a reliable connection between the upper and lower shells of a 3D printed outer shell through the cooperation structure between the fixing clip and the hook, without relying on traditional welding or external buckle mechanisms. It is suitable for structural conditions where the surface roughness of 3D printed parts is high and the dimensional accuracy is relatively low, thus improving assembly compatibility and stability.

[0012] The hook structure in this invention can be manufactured integrally with the shell during the 3D printing process, without the need for additional parts or installation operations. This simplifies the assembly process, reduces the number of parts, and facilitates structural standardization and modular design.

[0013] This utility model achieves an anti-loosening function by setting a limiting protrusion and a slot to cooperate, avoiding loosening of the connector due to vibration, displacement and other factors, and improving the reliability of the structure.

[0014] This utility model provides a cable outlet and a cable sealing joint on the side wall of the lower shell, which facilitates the sealed exit of power lines or signal lines, improves the overall protection level of the structure, and meets the requirements of electronic equipment for sealing and wiring specifications. Attached Figure Description

[0015] Figure 1 This is an exploded view of the overall component structure of this utility model;

[0016] Figure 2 This is the utility model Figure 1 Enlarged view of the A-structure;

[0017] Figure 3 This is a top view of the lower shell structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the assembly of the fixing clip and hook of this utility model;

[0019] In the diagram: 1-Fixing clip; 11-Card slot; 12-Screw hole; 2-Card hook; 21-Limiting protrusion; 22-Hook body; 3-Lower shell; 31-Mounting post; 32-Cable sealing connector; 4-Upper shell; 5-Mounting plate. Detailed Implementation

[0020] The present invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0021] like Figure 1 As shown, this utility model discloses a fixing buckle structure built into a 3D printed shell, including a fixing clip 1 and a hook 2. The fixing clip 1 and the hook 2 cooperate to reliably connect the upper shell 4 and the lower shell 3.

[0022] The fixing clip 1 is a one-piece molded structure, including a top wall and a pair of side walls extending downward from both ends of the top wall. A slot 11 is provided in the middle of the top wall, and the lower ends of the side walls are turned outward to form mounting portions. The mounting portions are provided with screw holes 12 for mechanical connection with the structure below. In this embodiment, two fixing clips 1 are provided, symmetrically arranged on both sides of the lower shell 3.

[0023] The hook 2 is fixedly mounted on the inner wall of the upper shell 4, consisting of two hook bodies 22 arranged in pairs with a gap between them. The outer distance between the two hook bodies matches the width of the slot 11 of the fixing card 1. This allows the two hook bodies 22 to be inserted into the slot 11 of the fixing card 1 during assembly, with the outer surfaces of the hook bodies 22 abutting against the inner sidewall of the slot 11. The length of the hook 2 is shorter than the length of the slot 11 of the fixing card 1. Each hook body 22 has a limiting protrusion 21 at its bottom, which protrudes outward and inserts into the opening of the slot 11. Specifically... Figure 2 and Figure 4As shown, the limiting protrusion 21 has an approximately trapezoidal outer contour, with its bottom edge being roughly the same width as the hook 22. A chamfered surface is provided on the side facing the insertion direction of the slot 11. This chamfer is used to slide and guide the protrusion after contacting the edge of the slot 11 during assembly, allowing the limiting protrusion 21 to smoothly interlock into the slot 11 during insertion. After engagement, its bottom edge is secured to the inner edge of the slot 11, preventing the hook 22 from detaching from the fixing clip 1, thus forming a stable engagement relationship. In this embodiment, there are two hooks 2, symmetrically arranged on the inner wall of the upper shell 4 of the 3D printed outer shell, corresponding to the fixing clip 1.

[0024] like Figure 1 and Figure 3 As shown, an installation plate 5 is provided inside the lower shell 3. The installation plate 5 has holes, the positions of which correspond to the screw holes 12 on the fixing clip 1. The bottom of the lower shell 3 has installation posts 31, which are cross-shaped reinforcing rib units with a through hole in the center. The installation post 31 has four symmetrical parts, which, after assembly, correspond to the holes in the installation plate 5 and the screw holes 12 on the fixing clip 1 to accommodate screws. Since the 3D-printed lower shell 3 is typically a thin-shell structure, if screws are directly screwed into the bottom plate of the lower shell, it can easily lead to localized material cracking, structural deformation, or screw slippage. By setting a cross-shaped reinforcing rib structure at the screw installation position, not only can the local compressive strength and tensile strength of the screw installation area be significantly improved, but the locking load can also be diffused and transmitted along the direction of the reinforcing ribs, thereby enhancing the structural stability of the entire bottom of the lower shell.

[0025] Furthermore, cable outlets are respectively provided on the two opposite side walls of the lower shell 3, and cable sealing joints 32 are installed at the outlets. The cable sealing joint 32 includes an outer shell, an internal sealing component and a locking structure, which is used to provide a sealed interface for wire entry and exit, and to adapt to the wiring requirements of power or signal lines.

[0026] like Figure 1 and Figure 4 As shown, the specific assembly steps are as follows:

[0027] (1) Place the mounting plate 5 inside the bottom of the lower shell 3, so that the holes on the mounting plate 5 correspond one-to-one with the through holes of the mounting post 31 at the bottom of the lower shell 3, and keep them in close contact;

[0028] (2) Place the fixing clip 1 on top of the mounting plate 5, so that the mounting part at its bottom is in contact with the mounting plate 5, and align the screw hole 12 on the fixing clip 1 with the hole on the mounting plate 5.

[0029] (3) Insert the screws into the screw holes 12 of the fixing card 1 and the holes on the mounting plate 5 in sequence, and continue to insert them into the central through hole of the mounting column 31. Tighten the screws to make the fixing card 1, the mounting plate 5 and the lower shell 3 form a rigid fixed connection.

[0030] (4) Align the upper shell 4 with the lower shell 3 from above and apply pressure slowly so that the pairs of hooks 2 on its inner wall are inserted into the slots 11 of the fixing card 1 in sequence.

[0031] (5) As the force continues to be applied, the limiting protrusion 21 at the bottom of the hook 2 slides into the beveled surface of the opening of the slot 11 and finally gets stuck in the inner edge of the slot 11, completing the locking engagement. Thus, the upper shell 4 and the lower shell 3 achieve structural locking and form an overall closed connection.

[0032] In the above structure, the hook 2 can be printed synchronously with the upper shell 4 as an integral structure during the 3D printing process. That is, the hook 2 is part of the upper shell 4 structure and can be directly and continuously formed along the same printing path through modeling design, without the need for separate processing or subsequent assembly. Similarly, the lower shell 3 and its bottom mounting post 31 can also be designed as an integral part during the modeling stage and manufactured as a whole during the 3D printing process, avoiding secondary assembly of stud-type parts. In contrast to the above structure, the fixing clip 1 and the mounting plate 5 can be modeled independently and printed together as independent structural parts in the same printing job. After printing, they can be removed from the printing platform for use by removing the support or tearing off the break point.

[0033] In another embodiment, the fixing card 1 can be printed as a whole with the mounting plate 5 to form an integrated component, which is suitable for different needs with different structural complexities and printing process paths.

[0034] This embodiment does not further limit other shell structures, circuit wiring, etc. Any variations that adopt the fixing principle of this structure should also fall within the protection scope of this utility model.

[0035] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A fixing buckle structure built into a 3D printed shell, comprising a fixing clip and a hook, characterized in that: The fixing clip is integrally formed, including a top wall and a pair of side walls extending downward from both ends of the top wall. The top wall has a slot, and the lower ends of the side walls extend outward to form mounting portions with screw holes. The hook consists of two hooks arranged in pairs with a gap between them. The distance between the outer surfaces of the two hooks is the same as the width of the slot. The bottom of the hook has a limiting protrusion that fits into the opening of the slot and is embedded inside the slot to restrict the movement of the fixing clip.

2. The fixing buckle structure built into a 3D printed shell according to claim 1, characterized in that: The fixing clip has two screw holes on its mounting part that engage with screws to fix it inside the lower shell of the 3D printed shell. The hook has two hooks that are symmetrically arranged on the inner wall of the upper shell of the 3D printed shell, corresponding to the fixing clip.

3. The fixing buckle structure built into a 3D printed shell according to claim 1, characterized in that: The length of the hook is shorter than the length of the slot of the fixed card; the outer contour of the limiting protrusion at the bottom of the hook is an approximately trapezoidal structure, and its bottom edge is basically the same as the width of the hook body. The limiting protrusion is provided with a beveled corner on the side facing the insertion direction, and the beveled corner cooperates with the edge of the slot to form an insertion channel.

4. The fixing buckle structure built into a 3D printed shell according to claim 2, characterized in that: The lower shell of the 3D printed shell has an internal mounting plate with holes corresponding to the screw holes of the fixing clips. The bottom of the lower shell has a mounting column structure, which is a cross-shaped distribution of reinforcing ribs with a through hole in the center. The screw passes through the screw holes of the fixing clips and the through hole of the mounting plate and is finally inserted into the through hole.

5. The fixing buckle structure built into a 3D printed shell according to claim 2, characterized in that: The lower shell has cable outlets on its two opposite side walls, and each cable outlet is equipped with a cable sealing joint.

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