Plastic part clamping structure

Abstract

The utility model relates to the field of part connection, in particular to a plastic part clamping structure which comprises a buckle body of a front cover and a buckling position structure correspondingly matched with the buckle body and located on a rear cover extension plate, and a through hole is formed in the rear cover extension plate in a penetrating mode to form a buckling position part base body. The inner wall, close to the rear cover extension plate, of the buckling part base body extends and is provided with a flow rate expansion part penetrating through a through hole in a protruding mode, the upper surfaces of the buckling part base body and the flow rate expansion part extend and are provided with buckling guide parts in a protruding mode, the inner wall, close to the rear cover extension plate, of the buckling guide parts is an inclined guide plane, and the width of the flow rate expansion part is 1 / 2-1 of the width of the buckling part base body. The joint between the buckling position guide part and the buckling position part base body and the joint between the buckling position guide part and the flow velocity expansion part are chamfers, and the buckling position guide part, the buckling position part base body and the flow velocity expansion part are integrally formed to form a The structure can effectively prevent poor glue leakage at the buckle position in the production process of the plastic rear shell, avoids the dark crack defect, enhances the structural strength of the buckle position, and prolongs the service life of the product.

Description

Technical Field

[0001] This application relates to the field of component connection, and in particular to a snap-fit ​​structure for plastic parts. Background Technology

[0002] In the LCD TV manufacturing industry, with the rapid development of technology, LCD display technology is constantly innovating. Advanced technologies such as high resolution, high refresh rate, and wide color gamut are gradually becoming widespread, greatly improving the visual effect of LCD TVs. Consumers' requirements for LCD TVs are no longer limited to basic viewing functions, but increasingly focus on their appearance design, overall thinness, and integration with home environment. A beautifully designed, thin and stylish LCD TV can not only bring users a high-quality visual experience, but also serve as a decoration for home space. This prompts LCD TV manufacturers to pay special attention to the connection structure of various components during the product design process, especially the fastening method between the back shell and the front shell. Because a reasonable fastening method can not only ensure the overall stability of the product and prevent the TV from loosening or separating during daily use, but also improve production efficiency and reduce production costs, thus gaining an advantage in fierce market competition. In addition, a good fastening structure can also improve the product's sealing performance, preventing dust, moisture, etc. from entering the TV and affecting the normal operation of electronic components. Currently, the plastic back shell and front shell are usually fastened using a U-shaped snap-fit ​​structure. This snap-fit ​​structure mainly consists of snap-fits and latches. The snap-fit ​​is typically a flexible protrusion on the front shell, while the latch is located on an extension plate perpendicular to the edge of the rear shell and protruding from its surface. It is formed by a U-shaped through-hole on the extension plate corresponding to the snap-fit. During LCD TV assembly, the operator aligns the front and rear shells and applies pressure to align the snap-fit ​​with the through-hole. Due to its elasticity, the snap-fit ​​deforms slightly during the compression process, allowing it to pass smoothly through the through-hole. Once fully inserted, the snap-fit ​​returns to its original shape, locking into the through-hole and securing the front and rear shells. This snap-fit ​​method, utilizing the interlocking of snap-fits and latches, is widely used in production and has become a common technique in the LCD TV manufacturing industry. However, the existing U-shaped snap-fit ​​design between the plastic rear and front shells has significant drawbacks. On the one hand, during the actual production of the plastic back cover, the extension plate is prone to poor glue application at the snap-fit ​​points. This can lead to hidden cracks at the snap-fit ​​points, affecting product quality and lifespan. While these hidden cracks may not have a significant impact on product use in the short term, they can gradually widen over time with frequent television use, eventually causing the back cover to break and severely affecting normal product operation. On the other hand, for relatively thin LCD TVs, the extension plate is usually also designed to be thin. After repeated disassembly and assembly, the snap-fit ​​points are easily broken due to repeated stress. Utility Model Content

[0003] In order to effectively prevent poor glue flow at the snap-fit ​​position during the production of plastic back cover, avoid the existence of hidden cracks, enhance the structural strength of the snap-fit ​​position, and extend the service life of the product, this application provides a snap-fit ​​structure for plastic parts.

[0004] This application provides a snap-fit ​​structure for plastic parts, including a snap-fit ​​body for a front cover and a corresponding snap-fit ​​structure that mates with the snap-fit ​​body and is located on a rear cover extension plate. The rear cover extension plate has a through hole to form a snap-fit ​​base. The side of the snap-fit ​​base near the inner wall of the rear cover extension plate extends and protrudes to form a flow expansion portion. The through hole penetrates the flow expansion portion. The upper surfaces of the snap-fit ​​base and the flow expansion portion have snap-fit ​​guide portions. The side of the snap-fit ​​guide portion near the inner wall of the rear cover extension plate is an inclined guide plane. The width of the flow expansion portion is 1 / 2-1 of the width of the snap-fit ​​base. The connection between the snap-fit ​​guide portion and the snap-fit ​​base and the flow expansion portion is chamfered. The snap-fit ​​base, the flow expansion portion, and the snap-fit ​​guide portion are all integrally formed to form the snap-fit ​​structure. The snap-fit ​​body mates with the snap-fit ​​structure through the through hole. By adopting the above technical solution, a through hole is formed in the rear cover extension plate to create the base of the snap-fit ​​part. The side of the snap-fit ​​part base near the inner wall of the rear cover extension plate extends and protrudes to form a flow expansion section. This flow expansion section can change the flow state of the plastic fluid during the production of the plastic back cover. When the plastic is injected into the mold, the flow expansion section increases the flow space of the plastic. When the thermoplastic fluid flows from the extension plate to the wider flow expansion section and the snap-fit ​​part base, the change in width makes the plastic flow more easily and more evenly fills the area around the snap-fit ​​part base, effectively preventing poor glue flow at the snap-fit ​​structure. Solving the problem of poor glue flow avoids hidden cracks at the snap-fit ​​structure, ensuring product quality and extending product lifespan. Simultaneously, the snap-fit ​​part base, flow expansion section, and snap-fit ​​guide section are integrally molded to form the snap-fit ​​structure. This integral molding method enhances the integrity and stability of the snap-fit ​​structure. The inclined guide plane on the snap-fit ​​guide section guides the snap-fit ​​body through the through hole when it engages with the snap-fit ​​structure, allowing the snap-fit ​​body to pass through the through hole more smoothly, reducing assembly resistance and improving assembly efficiency. Furthermore, the chamfered joint between the snap-fit ​​guide section, the snap-fit ​​base, and the flow expansion section disperses stress, further enhancing the strength of the snap-fit ​​structure and making it less prone to breakage after repeated assembly and disassembly. Preferably, the flow expansion section near the inner wall of the rear cover extension plate is a trapezoidal plane with its width gradually increasing from top to bottom. By adopting the above technical solution, the flow expansion section is set as a trapezoidal plane with its width gradually increasing from top to bottom. This allows the plastic fluid to flow along this trapezoidal plane during injection molding of the plastic back cover, widening the flow path and range of the fluid compared to existing snap-fit ​​structures. This allows the plastic fluid to fill the snap-fit ​​section more evenly and smoothly, effectively improving the situation of poor glue flow at the snap-fit ​​position. Solving the problem of poor glue application directly avoids the occurrence of hidden cracks at the product's snap-fit ​​points, thereby improving product quality.Moreover, this trapezoidal plane design disperses the stress concentration points of the fasteners when subjected to external forces, enhancing the overall structural strength of the fasteners. Even after multiple disassemblies and reassemblies, the fasteners are less prone to breakage, thus extending the product's service life. Preferably, the trapezoidal plane of the flow expansion section is vertically disposed on the surface of the back cover. By adopting the above technical solution, the trapezoidal plane of the flow expansion section is vertically disposed on the surface of the back cover, allowing the plastic to flow more regularly and stably according to its own gravity when flowing in the mold, compared to other inclined placement methods. This allows the plastic to fill the entire area more smoothly, effectively avoiding the occurrence of poor glue flow at the fasteners. Uniform glue flow means that the internal stress distribution of the plastic after molding is more uniform, reducing the possibility of dark cracks, thereby ensuring product quality and extending the product's service life. At the same time, this vertically disposed trapezoidal plane can more evenly disperse stress when the fasteners are subjected to external forces, further enhancing the structural strength of the fasteners and making them less prone to breakage during multiple disassemblies and reassemblies, which is beneficial to improving the overall performance and stability of the product. Preferably, the trapezoidal plane of the flow expansion section is inclinedly disposed on the inner surface of the rear cover, forming an acute angle of 60°-90° with the inner surface of the rear cover towards the rear cover extension plate. By adopting the above technical solution, the trapezoidal plane of the flow expansion section is inclinedly disposed on the inner surface of the rear cover, forming an acute angle of 60°-90° with the inner surface of the rear cover towards the rear cover extension plate. During the injection molding production of the plastic back cover, this inclined arrangement changes the flow direction and speed of the plastic material. Due to the special shape and angle limitation of the trapezoidal plane, the plastic material can better fill the base and other parts of the snap-fit ​​section when flowing through the flow expansion section, avoiding the problem of poor glue flow at the snap-fit ​​position caused by poor material flow. Moreover, compared with the existing snap-fit ​​structure, this design makes the plastic distribution at the snap-fit ​​position more uniform, reduces stress concentration, and effectively avoids the appearance of dark cracks at the snap-fit ​​position, improving the quality and overall performance of the product. At the same time, this structure enhances the structural strength of the snap-fit ​​position. During the assembly and subsequent use of the LCD TV, even after multiple disassemblies and reassemblies, the snap-fit ​​position is not prone to breakage, greatly extending the service life of the product. Preferably, the guide plane forms an acute angle of 60°-90° with the upper surface of the rear cover extension plate towards the latching guide portion. By adopting the above technical solution, the guide plane forms an acute angle of 60°-90° with the upper surface of the rear cover extension plate towards the latching guide portion. This specific angle range allows the guide plane to have a suitable inclination. When the latch body mates with the latching structure through the through hole, this inclined guide plane can effectively guide the latch body to slide smoothly into the through hole. Compared with existing latching structures, this reduces the resistance and obstruction encountered by the latch body during insertion, and lowers the assembly difficulty.Furthermore, during repeated disassembly and assembly operations, this smooth guiding effect reduces wear between the snap-fit ​​body and the snap-fit ​​structure, thereby extending the service life of the plastic part snap-fit ​​structure and ensuring the stability and reliability of the connection between the plastic back cover and the front cover. Preferably, the side of the integrally molded snap-fit ​​base, the flow expansion part, and the snap-fit ​​guide part near the outer wall of the back cover extension plate is a plane perpendicular to the inner surface of the back cover. By adopting the above technical solution, the side of the integrally molded snap-fit ​​base, the flow expansion part, and the snap-fit ​​guide part near the outer wall of the back cover extension plate is a plane perpendicular to the inner surface of the back cover. This structural design allows the plastic fluid to fill the mold cavity more evenly during injection molding. The vertical plane design avoids the problem of uneven plastic flow resistance caused by surface tilt or irregularity, reducing the situation of local pressure concentration. Because the plastic fluid filling is more uniform, the flow of glue at the snap-fit ​​position is smoother, effectively preventing the phenomenon of poor glue flow at the snap-fit ​​position and avoiding the generation of dark crack defects. Meanwhile, this vertical plane structure is more stable in mechanical properties, better dispersing external forces and enhancing the structural strength of the snap-fit, while ensuring a tighter fit between the snap-fit ​​part and the snap-fit ​​body. During repeated assembly and disassembly, the snap-fit ​​can withstand greater forces without easily breaking, thus extending the product's service life. Preferably, the connection between the rear cover extension plate and the flow expansion part is an arc-shaped transition surface. By adopting the above technical solution, setting the connection between the rear cover extension plate and the flow expansion part as an arc-shaped transition surface effectively disperses the stress generated by the fluid during injection molding, compared to ordinary connection methods. During the injection molding of the plastic back cover, when the fluid flows through this connection, the arc-shaped transition surface makes the fluid flow smoother, reducing local high pressure caused by flow obstruction and avoiding stress concentration. This stress dispersion helps improve the glue flow at the snap-fit ​​position, preventing dark cracks caused by poor glue flow, thereby improving product quality and service life. Meanwhile, during the assembly and daily use of LCD TVs, external forces are inevitably applied to the fastening structure. The arc-shaped transition surface can better buffer and disperse these external forces, enhancing the overall stability and durability of the fastening structure. Even after repeated disassembly and assembly, the fastening is less prone to breakage, further improving the product's reliability and practicality. Preferably, the connection between the flow expansion section and the inner surface of the back cover is an arc-shaped transition surface. By adopting the above technical solution, the connection between the flow expansion section and the inner surface of the back cover is set as an arc-shaped transition surface. Compared with right angles or other sharp connection forms, the arc-shaped transition surface allows the plastic fluid to flow more smoothly, reducing fluid resistance and turbulence at the connection point.This avoids situations where the plastic fluid experiences localized slow flow or stagnation due to sudden changes in direction or obstruction when flowing through this area. This ensures uniform filling of the plastic fluid throughout the entire snap-fit ​​structure during molding, effectively preventing poor glue flow at the snap-fit ​​point during the production of the plastic back cover. It also avoids defects such as hidden cracks caused by poor glue flow, improving product quality and reliability. Simultaneously, this arc-shaped transition surface design disperses the stress borne by the snap-fit ​​structure, enhancing its structural strength and extending the product's service life. Preferably, it also includes a snap-fit ​​reinforcement portion, which is provided between the snap-fit ​​structure and the rear cover extension plate, protruding from the surface of the rear cover extension plate. By adopting the above technical solution, the snap-fit ​​reinforcement portion protruding from the surface of the rear cover extension plate between the snap-fit ​​structure and the rear cover extension plate can share the external force borne by the snap-fit ​​structure during its engagement with the snap-fit ​​body. When assembling or disassembling the front and rear covers, or when the product is subjected to external forces such as vibration or impact during daily use, the snap-fit ​​structure will be subjected to corresponding forces. The snap-fit ​​reinforcement can distribute some of the force to the rear cover extension plate, preventing excessive local stress on the snap-fit ​​structure. This effectively reduces the probability of breakage or damage to the snap-fit ​​structure, enhances its structural strength, and improves the stability and reliability of the entire plastic snap-fit ​​structure, extending the product's lifespan and ensuring that products using this snap-fit ​​structure, such as LCD TVs, will not experience functional issues due to damage during long-term use. Preferably, the front cover is surrounded by two snap-fit ​​plates, forming a snap-fit ​​groove between them. The snap-fit ​​body protrudes from the snap-fit ​​plate near the outer side and is located within the snap-fit ​​groove. The snap-fit ​​plate near the inner side has a clearance opening to avoid the flow expansion portion. When the extension plate is inserted into the snap-fit ​​groove, the snap-fit ​​body inserts into the through hole and engages with the snap-fit ​​structure. By adopting the above technical solution, the front cover is surrounded by two snap-fit ​​plates forming snap-fit ​​grooves. The snap-fit ​​body protrudes from the snap-fit ​​plate near the outer side and is located within the snap-fit ​​groove. When the extension plate is inserted into the snap-fit ​​groove, this arrangement facilitates the precise insertion of the snap-fit ​​body into the through hole and engagement structure, achieving a stable connection between the front and rear covers. Simultaneously, the snap-fit ​​plate near the inner side has a clearance opening to avoid interference between the flow expansion section and the extension plate. Since the flow expansion section is designed to improve plastic flow, the clearance opening prevents interference between the snap-fit ​​plate and the flow expansion section during installation, allowing the extension plate to be inserted into the snap-fit ​​groove more smoothly. This further improves assembly convenience and ensures the efficiency and reliability of the plastic part snap-fit ​​structure in actual assembly operations.

[0005] In summary, this application includes at least one of the following beneficial technical effects:

[0006] 1. By setting a flow rate expansion section, and the width of the flow rate expansion section is 1 / 2 - 1 of the width of the base of the snap-fit ​​section, the flow space of the colloid is expanded, the flow of the colloid at the snap-fit ​​position is improved, and the poor glue flow at the snap-fit ​​position is effectively prevented during the production of the plastic back shell, thus avoiding the existence of hidden crack defects.

[0007] 2. The base of the fastening part, the flow expansion part, and the fastening guide part are integrally formed. This integrated structure eliminates the weak points in the connection between the components. Furthermore, the connection between the fastening guide part and the base of the fastening part and the flow expansion part is chamfered, which reduces stress concentration and thus enhances the structural strength of the fastening.

[0008] 3. The side of the buckle guide near the inner wall of the rear cover extension plate is an inclined guide plane. This guide plane forms an acute angle of 60° - 90° with the upper surface of the rear cover extension plate towards the buckle guide, which facilitates the buckle body to be smoothly inserted into the through hole of the buckle structure. Combined with the enhanced structural strength of the buckle structure itself, it can ensure that the front shell and the rear shell are tightly fastened, improve the overall stability of the product, and extend the service life of the product. Attached Figure Description

[0009] Figure 1 This is a structural diagram of a back cover with a snap-fit ​​structure for a plastic part, as described in this application;

[0010] Figure 2 This is a structural diagram of a front cover with a snap-fit ​​structure for a plastic part, as described in this application;

[0011] Figure 3 This application Figure 1 A partial view of point A;

[0012] Figure 4 This application Figure 2 Point B is a local area.

[0013] Explanation of reference numerals in the attached drawings: a, front cover; b, rear cover; a1, snap-fit ​​plate; a2, snap-fit ​​groove; a3, clearance opening; b1, extension plate; 1, snap-fit ​​body; 2, snap-fit ​​structure; 3, snap-fit ​​reinforcement; 21, snap-fit ​​base; 22, flow expansion section; 23, snap-fit ​​guide section; 24, through hole; 231, guide plane. Detailed Implementation

[0014] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0015] This application provides a plastic part snap-fit ​​structure, referring to... Figure 1 and Figure 2 It includes a snap-fit ​​body 1 located on the front cover a, a snap-fit ​​structure 2 located on the extension plate b1 of the rear cover b, and a snap-fit ​​reinforcement 3 located between the extension plate b1 of the rear cover b and the snap-fit ​​structure 2.

[0016] Reference Figure 3 and Figure 4 The fastening reinforcement 3 is used to reinforce the connection between the fastening structure 2 and the extension plate b1. In this embodiment, the edge of the front cover a is surrounded by two snap-fit ​​plates a1, and a snap-fit ​​groove a2 is formed between the two snap-fit ​​plates a1 for inserting the extension plate b1 of the rear cover b. In this embodiment, the extension plate b1 is also surrounded by the edge of the rear cover b, and multiple fastening structures 2 are provided on the extension plate b1 at intervals. Multiple snap-fit ​​bodies 1 are provided on the snap-fit ​​plates a1 corresponding to the fastening structures 2.

[0017] In this embodiment, the fastening structure 2 includes a fastening base 21, a flow rate expansion part 22, and a fastening guide part 23.

[0018] Reference Figure 3 Specifically, the base 21 of the fastening part is formed by opening a through hole 24 in the extension plate b1 of the rear cover b. It is the basic part of the fastening structure 2 and bears the main structure of the entire fastening part. The base 21 of the fastening part is usually made of the same plastic material as the rear cover b and is integrally molded. The surface of the base 21 of the fastening part is flush with the surface of the extension plate b1 to ensure the stability and integrity of the structure.

[0019] Specifically, the flow expansion section 22 extends and protrudes from the side of the snap-fit ​​base 21 near the inner wall of the rear cover b extension plate b1, and the through hole 24 of the snap-fit ​​base 21 penetrates the flow expansion section 22. The flow expansion section 22 is connected to the snap-fit ​​base 21, and the two are integrally molded, ensuring the continuity and stability of the structure. The width of the flow expansion section 22 is 1 / 2 - 1 of the width of the snap-fit ​​base 21. The side of the flow expansion section 22 near the inner wall of the rear cover b extension plate b1 is a trapezoidal plane with a smaller upper side and a larger lower side, that is, the width of the upper side of the trapezoid is smaller than the width of the lower side. This trapezoidal plane design helps to allow the plastic fluid to fill the snap-fit ​​structure 2 more smoothly during the plastic molding process, reducing the possibility of poor glue flow. In this embodiment, the trapezoidal plane of the flow expansion portion 22 is perpendicular to the surface of the rear cover b. At this time, the flow expansion portion 22 extends out from the fastening portion base 21 in a direction perpendicular to the surface of the rear cover b. In other embodiments, the trapezoidal plane of the flow expansion portion 22 may also be inclined on the inner surface of the rear cover b, with an inclination angle of 60°-90°, and the trapezoidal plane forms an acute angle with the inner surface of the rear cover b toward the extension plate b1 of the rear cover b.

[0020] Furthermore, in this embodiment, the connection between the flow expansion section 22 and the inner surface of the rear cover b, and the connection between the flow expansion section 22 and the extension plate b1 of the rear cover b, are both arc-shaped transition surfaces. This arc-shaped transition surface can avoid stress concentration, enhance the connection strength between the flow expansion section 22 and the rear cover b, and prevent cracking and other problems during use. The arc-shaped transition surface smoothly connects the flow expansion section 22 and the inner surface of the rear cover b, allowing force to be transmitted evenly.

[0021] Specifically, the snap-fit ​​guide portion 23 extends and protrudes from the upper surfaces of the snap-fit ​​base 21 and the flow expansion portion 22. The snap-fit ​​guide portion 23 is integrally formed with the snap-fit ​​base 21 and the flow expansion portion 22, ensuring the overall stability of the snap-fit ​​structure 2. The snap-fit ​​guide portion 23 is provided with an inclined guide plane 231, which is the side of the snap-fit ​​guide portion 23 closest to the inner wall of the rear cover b extension plate b1. Furthermore, the guide plane 231 forms an acute angle of 60°-90° with the upper surface of the rear cover b extension plate b1 towards the snap-fit ​​guide portion 23. This guide plane 231 guides the snap-fit ​​body 1 when it is inserted into the through hole 24, allowing the snap-fit ​​body 1 to enter the snap-fit ​​structure 2 more smoothly and improving assembly efficiency. When the snap-fit ​​body 1 is inserted into the through hole 24, it first contacts the guide plane 231 and accurately enters the through hole 24 under the guidance of the guide plane 231.

[0022] In particular, in this embodiment, the connection between the snap-fit ​​guide 23 and the snap-fit ​​base 21, and between the snap-fit ​​guide 23 and the flow rate expansion part 22, are all chamfered. The chamfer design can avoid sharp edges, reduce stress concentration, and improve the overall strength and durability of the snap-fit ​​structure 2.

[0023] Specifically, the latching base 21, the flow expansion part 22, and the latching guide part 23 are integrally formed. The side of each of them closest to the outer wall of the extension plate b1 of the rear cover b is a plane perpendicular to the inner surface of the rear cover b. This planar design allows the latching structure 2 to be flush with the extension plate b1 of the rear cover b, increasing the stability of the connection. In other words, this plane is flush with the outer wall of the extension plate b1 of the rear cover b and does not protrude from the outer wall of the extension plate b1, allowing the latching body 1 to better fit with the latching structure 2 with high precision.

[0024] Specifically, a snap-fit ​​groove a2 is formed between the two snap-fit ​​plates a1 surrounding the front cover a. The snap-fit ​​body 1 protrudes from the inner wall of the snap-fit ​​plate a1 near the outer side and is located within the snap-fit ​​groove a2. A clearance opening a3 is provided on the snap-fit ​​plate a1 near the inner side, corresponding to the position of the snap-fit ​​body 1. The clearance opening a3 is used to avoid the flow velocity expansion part 22. When assembling the front cover a and the rear cover b, the extension plate b1 is inserted into the snap-fit ​​groove a2, and both sides of the extension plate b1 are respectively attached to the inner walls of the two snap-fit ​​plates a1. At this time, the snap-fit ​​body 1 is inserted into the through hole 24 and cooperates with the snap-fit ​​structure 2 to achieve a tight connection between the front cover a and the rear cover b. The design of the snap-fit ​​plate a1 and the snap-fit ​​groove a2 can increase the contact area between the front cover a and the rear cover b and improve the stability of the connection.

[0025] Specifically, in this embodiment, the buckle reinforcement 3 protrudes from the surface of the rear cover b extension plate b1. The buckle reinforcement 3 is connected to the buckle structure 2 and the rear cover b extension plate b1, serving to enhance the strength of the buckle structure 2. The buckle reinforcement 3 can further enhance the strength of the buckle structure 2, especially after repeated disassembly and assembly, effectively preventing the buckle from breaking due to repeated stress. The buckle reinforcement 3 can be integrally molded from the same plastic material as the buckle structure 2, or it can be reinforced with other reinforcing materials, such as metal sheets.

[0026] Specifically, in this embodiment, the upper surface of the snap-fit ​​body 1 is provided with a downwardly inclined snap-fit ​​guide plane 231. The snap-fit ​​body 1 penetrates the through hole 24 and fits tightly with the snap-fit ​​structure 2. This fit enables a stable connection between the front cover a and the rear cover b. Specifically, when assembling the front cover a and the rear cover b, the front cover a must be aligned with the rear cover b, and a certain pressure must be applied to the front cover a to ensure that the snap-fit ​​body 1 is precisely aligned with the through hole 24 on the extension plate b1 of the rear cover b. Utilizing the elasticity of the snap-fit ​​body 1, it undergoes a certain degree of deformation during the compression process, thereby smoothly passing through the through hole 24 and engaging with the snap-fit ​​structure 2. Through the specially designed snap-fit ​​structure 2 of this embodiment, poor glue flow at the snap-fit ​​position during the production of the plastic back cover is effectively prevented, avoiding defects such as dark cracks. At the same time, the structural strength of the snap-fit ​​position is enhanced, extending the product's service life.

[0027] The implementation principle of this embodiment is as follows: the fastening base 21, the flow expansion part 22, and the fastening guide part 23 are integrally formed. Specifically, the fastening base 21 is first formed by opening a through hole 24 through the extension plate b1 of the rear cover b, and its surface is flush with the extension plate b1. The flow expansion part 22 extends and protrudes from the side of the fastening base 21 near the inner wall of the extension plate b1 of the rear cover b, and its width is 1 / 2 - 1 of the width of the fastening base 21. The trapezoidal plane is set perpendicular to or inclined at 60°-90° on the surface of the rear cover b, and the connection with the inner surface of the rear cover b and the extension plate b1 is an arc-shaped transition surface. Then, the fastening guide part 23 extends and protrudes from the upper surface of the fastening base 21 and the flow expansion part 22, and the fastening guide part 23 is provided with an inclined guide plane 231, which forms a 60°-90° angle with the upper surface of the extension plate b1 of the rear cover b. The front cover a has a 90° acute angle, and the connection between the front cover a and the base 21 and the flow expansion part 22 is chamfered. The side of the three near the outer wall of the extension plate b1 of the rear cover b is a plane perpendicular to the inner surface of the rear cover b. At the same time, two snap-fit ​​plates a1 are spaced apart around the edge of the front cover a to form a snap-fit ​​groove a2. The snap-fit ​​body 1 protrudes from the inner wall of the outer snap-fit ​​plate a1 and is located in the snap-fit ​​groove a2. The inner snap-fit ​​plate a1 is provided with a clearance opening a3 at the corresponding position. In addition, a snap-fit ​​reinforcement part 3 is provided on the surface of the extension plate b1 of the rear cover b, which is connected to the snap-fit ​​structure 2 and the extension plate b1. During assembly, the front cover a and the rear cover b are aligned. Pressure is applied to the front cover a, and the snap-fit ​​body 1 is elastically deformed to make it fit tightly with the snap-fit ​​structure 2 through the through hole 24. The snap-fit ​​structure 2 designed in this way can effectively prevent poor glue flow during the production of the plastic back cover, avoid dark crack defects, enhance the strength of the snap-fit ​​structure 2, and extend the service life of the product.

[0028] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A snap-fit ​​structure for plastic parts, characterized in that, The device includes a snap-fit ​​body (1) of a front cover (a) and a snap-fit ​​structure (2) corresponding to the snap-fit ​​body (1) and located on the extension plate (b1) of the rear cover (b). The extension plate (b1) of the rear cover (b) has a through hole (24) to form a snap-fit ​​base (21). The snap-fit ​​base (21) extends and protrudes to form a flow velocity expansion portion (22) on the side near the inner wall of the extension plate (b1) of the rear cover (b). The through hole (24) penetrates the flow velocity expansion portion (22). The upper surfaces of the snap-fit ​​base (21) and the flow velocity expansion portion (22) are provided with snap-fit ​​guide portions (23). The side of part (23) near the inner wall of the extension plate (b1) of the back cover (b) is an inclined guide plane (231). The width of the flow expansion part (22) is 1 / 2-1 of the width of the base of the snap-fit ​​part (21). The connection between the snap-fit ​​guide part (23), the base of the snap-fit ​​part (21), and the flow expansion part (22) is chamfered. The base of the snap-fit ​​part (21), the flow expansion part (22), and the snap-fit ​​guide part (23) are all integrally formed to form the snap-fit ​​structure (2). The snap-fit ​​body (1) penetrates the through hole (24) and cooperates with the snap-fit ​​structure (2).

2. The plastic part snap structure according to claim 1, wherein, The side of the flow expansion section (22) near the inner wall of the extension plate (b1) of the rear cover (b) is a trapezoidal plane, and its width gradually increases from top to bottom.

3. The plastic part snap structure of claim 2, wherein, The trapezoidal plane of the flow rate expansion section (22) is perpendicularly disposed on the surface of the rear cover (b).

4. The plastic part snap-fit ​​structure according to claim 2, characterized in that, The trapezoidal plane of the flow expansion section (22) is inclinedly disposed on the inner surface of the rear cover (b) and forms an acute angle of 60°-90° with the inner surface of the rear cover (b) toward the extension plate (b1) of the rear cover (b).

5. The plastic part snap-fit ​​structure according to claim 1, characterized in that, The guide plane (231) forms an acute angle of 60°-90° with the upper surface of the extension plate (b1) of the rear cover (b) toward the buckle guide (23).

6. The plastic part snap-fit ​​structure according to claim 1, characterized in that, The one-piece molded fastening base (21), flow expansion part (22) and fastening guide part (23) have a plane perpendicular to the inner surface of the back cover (b) extension plate (b1) on the side near the outer wall of the back cover (b).

7. The plastic part snap-fit ​​structure according to claim 1, characterized in that, The connection between the rear cover (b) extension plate (b1) and the flow rate expansion section (22) is an arc-shaped transition surface.

8. The plastic part snap-fit ​​structure according to claim 1, characterized in that, The connection between the flow rate expansion section (22) and the inner surface of the rear cover (b) is an arc-shaped transition surface.

9. The plastic part snap-fit ​​structure according to claim 1, characterized in that, It also includes a fastening reinforcement (3), which is provided between the fastening structure (2) and the extension plate (b1) of the rear cover (b), and the fastening reinforcement (3) protrudes from the surface of the extension plate (b1) of the rear cover (b).

10. The plastic part snap-fit ​​structure according to claim 1, characterized in that, The front cover (a) is surrounded by two snap-fit ​​plates (a1), and a snap-fit ​​groove (a2) is formed between the two snap-fit ​​plates (a1). The snap-fit ​​body (1) protrudes from the snap-fit ​​plate (a1) near the outer side and is located in the snap-fit ​​groove (a2). The snap-fit ​​plate (a1) near the inner side has a relief opening (a3) ​​to avoid the flow expansion part (22). When the extension plate (b1) is inserted into the snap-fit ​​groove (a2), the snap-fit ​​body (1) is inserted into the through hole (24) and cooperates with the buckle structure (2).

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