Shell part, shell assembly, household appliance and injection mold

Abstract

The utility model relates to a shell part, a shell assembly, a household appliance and an injection mold, and the shell part comprises a shell structure which is provided with an opening communicating with the interior of the shell structure; one end of the buffer structure is arranged on the inner wall of the shell structure, and the other opposite end of the buffer structure extends in the direction away from the shell structure; the buffer structure and the shell structure are integrally formed in an injection molding mode, and a glue inlet point is arranged at the end, away from the shell structure, of the buffer structure. By arranging the glue inlet point at the end, away from the shell part, of the buffer structure, plastic in a hot melting state cannot directly impact the outer surface of the shell part in the injection molding process of the shell part, so that stress between cooling shrinkage molecular chains is eliminated, and the appearance defects of shrinkage marks and bright spots on the outer surface of the shell part are avoided.

Description

Technical Field

[0001] This application relates to the field of mold technology, and in particular to a housing part, housing assembly, household appliance and injection mold. Background Technology

[0002] Tower fans, as a common household appliance, are favored by consumers for their unique design and excellent airflow. Traditional tower fans consist of a front and rear casing joined together, with a stop structure on the rear casing to prevent misalignment or breakage during assembly.

[0003] To meet the need for lightweight tower fans, the front and rear shells are mostly injection molded parts. These parts are formed by injection molding using injection molds. However, after the front shell cools and the mold opens, there is a break at the injection point. This break affects the fit between the front shell and the upper stop limiting structure of the rear shell. Therefore, the injection point of the front shell is mostly located on the inner side.

[0004] During the injection molding process of the front shell, when the injection material cools rapidly below its solidification temperature, the cooling shrinkage prevents the stress between the molecular chains from being fully released, resulting in shrinkage marks and bright spots at the injection point. Since the injection point of the front shell is on the inner side, the formation of shrinkage marks and bright spots at the injection point will affect the appearance quality of the outer surface of the front shell. Utility Model Content

[0005] Therefore, it is necessary to provide a housing part, housing assembly, household appliance, and injection mold to address the problem that shrinkage marks and bright spots at the injection point affect the appearance quality of the outer surface of the front shell.

[0006] A housing component, comprising:

[0007] A shell structure with an opening that communicates with its own interior;

[0008] A buffer structure, one end of which is located on the inner wall of the shell structure, and the other end of which extends away from the shell structure;

[0009] The buffer structure is integrally injection molded with the shell structure, and the end of the buffer structure away from the shell structure has a glue injection point.

[0010] In one embodiment, the buffer structure is located at the edge of the opening in the housing structure.

[0011] In one embodiment, the housing structure has an end face for splicing with a mating housing, and the end face has a chamfer between it and the buffer structure.

[0012] In one embodiment, the shell structure is semi-cylindrical, with one end of the buffer structure located on the inner wall of the shell structure and the other end extending toward the axis of the shell structure.

[0013] In one embodiment, the buffer structure includes multiple buffer structures, all of which are arranged at circumferential intervals along the shell structure;

[0014] And / or, all of the buffer structures are arranged at intervals along the axial direction of the shell structure.

[0015] A housing assembly comprising a housing element as described in any of the preceding claims.

[0016] In one embodiment, the housing assembly further includes a mating housing that can be spliced ​​with the housing structure and that the mating housing closes the opening of the housing structure.

[0017] In one embodiment, the mating housing includes a stepped portion that protrudes from the end face of the mating housing for splicing with the housing structure, and when the mating housing is spliced ​​with the housing structure, the stepped portion extends into the opening.

[0018] In one embodiment, the stepped portion includes multiple stepped portions, all of which are spaced apart along the extension direction of the mating shell, and an avoidance gap is formed between two adjacent stepped portions. When the mating shell is spliced ​​with the shell structure, the buffer structure is located within the avoidance gap.

[0019] In one embodiment, the housing structure is used for an end face that splices with a mating housing, and the end face has a chamfer between it and the buffer structure;

[0020] The mating housing includes a blocking portion, which protrudes from the end face of the mating housing for splicing with the housing structure and is located within the clearance notch. The blocking portion abuts against the chamfer.

[0021] A household appliance comprising a housing assembly as described in any of the preceding claims.

[0022] An injection mold for injection molding a housing part as described above, the injection mold comprising:

[0023] The main space is the main structure used for injection molding shell parts;

[0024] A buffer space, connected to the main body space, is used for injection molding the buffer structure;

[0025] The glue inlet is connected to the end of the buffer space that is furthest from the main body space.

[0026] The aforementioned housing component, by setting the injection point at the end of the buffer structure away from the housing component, ensures that the hot-melt plastic does not directly impact the outer surface of the housing component during the injection molding process, thereby eliminating the stress between the molecular chains during cooling and shrinkage, and avoiding shrinkage marks and bright spots on the outer surface of the housing component. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the existing housing assembly.

[0028] Figure 2 for Figure 1 A cross-sectional view of the middle shell.

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0030] Figure 4 for Figure 1 A schematic diagram of the front shell of the middle shell during injection molding.

[0031] Figure 5 for Figure 4 A cross-sectional view of the front shell of the middle shell during injection molding.

[0032] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0033] Figure 7 This is a schematic diagram showing the assembly of the front shell and the rear shell after the bottom is glued.

[0034] Figure 8 This is a schematic diagram of the structure of the housing component and the mating housing in some embodiments of this application.

[0035] Figure 9 for Figure 8 Cross-sectional schematic diagram of the middle shell component.

[0036] Figure 10 for Figure 9 A magnified view of point C in the middle.

[0037] Figure 11 for Figure 8 A schematic diagram of the structure of the middle shell component during injection molding.

[0038] Figure 12 for Figure 11 Enlarged view of point D in the middle.

[0039] Figure 13 for Figure 8 A cross-sectional view of the housing component during injection molding.

[0040] Figure 14 for Figure 13 Enlarged view of point E in the middle.

[0041] Figure 15 for Figure 8 A schematic diagram of the middle shell component and the mating shell from another perspective.

[0042] Figure 16 for Figure 15 Enlarged view of point F in the middle.

[0043] Explanation of reference numerals in the attached figures:

[0044] Front shell 100; Rear shell 110; Breakpoint 120;

[0045] Shell structure 10; opening 11;

[0046] Buffer structure 20; glue inlet 21; chamfer 22;

[0047] Fitting housing 30; stepped portion 31; clearance notch 32; blocking portion 33;

[0048] 40. Inlet 41. Sloping top 42. Hot runner 43. First cold runner 44. First cold gate 45. Second cold runner Detailed Implementation

[0049] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0050] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0051] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0055] Before introducing the embodiments of this application, please refer to Figure 1 , Figure 1 The diagram shows an exploded view of the casing of a traditional household appliance. The traditional household appliance includes a front casing 100 and a rear casing 110. The front casing 100 and the rear casing 110 are spliced ​​together to form a cylindrical casing, and the interior of the casing is used to store the components of the household appliance or to form various air ducts.

[0056] Both the front shell 100 and the rear shell 110 are injection molded. For the injection molding process of the front shell 100, please refer to... Figure 4 , Figure 5 and Figure 6 If the injection point 21 is located in the area where the front shell 100 and the rear shell 110 contact, that is, on the bottom of the front shell 100, because the front shell 100 needs to be cut at the injection point 21 after injection molding to separate it from the injection mold, there will be a breakpoint 120 at the injection point 21. Figure 7 As shown, the breakpoint 120 causes unevenness on the bottom end face of the front shell 100, which in turn prevents the front shell 100 from being properly assembled with the rear shell 110.

[0057] However, placing the glue injection point 21 on the outer surface of the front shell 100 would result in an uneven outer surface, affecting the user experience. Therefore, the glue injection point 21 of the front shell 100 can only be placed on the inner surface of the shell, such as... Figure 6 As shown. However, with this injection molding method, when the material cools rapidly to below the solidification temperature during injection molding, the cooling shrinkage causes the stress between molecular chains to not be fully released, resulting in shrinkage marks and bright spots at the injection gate 40. These shrinkage marks and bright spots affect the appearance quality of the outer surface of the front shell 100, thus affecting the user's experience.

[0058] For this purpose, please refer to Figure 8 , Figure 9 and Figure 10 One embodiment of this application provides a household appliance including a housing assembly. The housing assembly includes a housing component and a mating housing 30. The housing assembly formed by splicing the housing component and the mating housing 30 together can serve as the outer shell of the household appliance. Furthermore, after the housing component and the mating housing 30 are spliced ​​together, they can form an installation space for accommodating other components of the household appliance, such as circuit boards. When the household appliance is a fan or tower fan, or other appliance capable of outputting airflow, the installation space formed by the housing component and the mating housing 30 can also be used for gas circulation.

[0059] The installation space can be entirely formed within the housing component, or the housing component and the mating housing 30 can jointly form the installation space. Specifically, the housing component has an installation sub-space inside, and the housing component also has an opening 11 that communicates with the installation space. After the mating housing 30 and the housing component are spliced ​​together, the mating body closes the opening 11 on the housing component, thereby allowing the mating body and the housing component to splice together to form the installation space.

[0060] If the housing component is directly injection molded in the same way as the front shell 100, shrinkage marks and bright spots will be formed on the outer surface of the housing component due to injection molding. Therefore, the housing component includes a housing structure 10 and a buffer structure 20. The housing structure 10 has the above-mentioned mounting subspace and the mounting subspaces are interconnected. The housing 30 can be spliced ​​with the housing structure 10 and the opening 11 on the housing structure 10 is closed.

[0061] One end of the buffer structure 20 is located on the inner wall of the housing structure 10, that is, one end of the buffer structure 20 is located on the inner wall of the mounting subspace, and the other end extends in a direction away from the housing structure 10. Furthermore, the buffer structure 20 and the housing structure 10 are integrally formed by injection molding, and the end of the buffer structure 20 away from the housing structure 10 has a glue injection point 21.

[0062] The injection point 21 refers to the point where the housing part connects to the plastic in the cold runner of the injection mold after it has been formed. During the injection molding process, the plastic in the cold runner is kept flowing by the injection pressure and its own heat. When the housing part cools, the plastic in the cold runner cools together with it, forming a single unit. Finally, after the injection mold opens, the plastic in the cold runner and the housing part separate from the mold. Then, through cutting or other methods, the plastic in the cold runner and the housing part are separated to obtain the desired housing part.

[0063] By setting the injection point 21 at the end of the buffer structure 20 away from the shell part, the hot-melt plastic will not directly impact the outer surface of the shell part during the injection molding process, thereby eliminating the stress between the molecular chains of cooling and shrinkage, and avoiding shrinkage marks and bright spots on the outer surface of the shell part.

[0064] In some embodiments of this application, the buffer structure 20 is located at the edge of the opening 11 of the shell structure 10. Since the molten plastic is injected from the injection point 21 on the buffer structure 20 of the shell during injection molding, the buffer structure 20 is set at the edge of the opening 11 so that the shell part will be formed from the edge of the shell structure 10, thereby making the injection path of the molten plastic approach an L-shape.

[0065] If the buffer structure 20 is placed at the injection point 21, the flow path of the molten plastic in the injection mold will be closer to a T-shape. Compared with the T-shape injection path, the L-shaped injection path not only reduces the complexity of the injection mold, but also makes the flow of molten plastic in the mold smoother, thereby improving injection efficiency and quality.

[0066] It should be noted that in actual use, the housing can be of different shapes depending on the needs of the household appliance. The housing can be hemispherical, semi-cylindrical as shown in the following embodiment, cubic, or other irregular shapes. The edge of the opening 11 of the housing refers to the part of the inner wall of the housing near the opening 11. Taking the housing as a hemispherical shape as an example, the edge of the hemisphere near the opening 11 refers to the circumference of the inner wall of the hemisphere near the opening 11.

[0067] In some embodiments of this application, the shell structure 10 is semi-cylindrical, with one end of the buffer structure 20 located on the inner wall of the shell structure 10 and the other end extending toward the axis of the shell structure 10. That is, the length direction of the buffer structure 20 is perpendicular to the inner wall of the shell structure 10, so the flow path of the molten plastic in the injection mold is closer to an L-shape, thereby making the flow of the molten plastic in the mold smoother, and thus improving injection molding efficiency and quality.

[0068] In some embodiments, the buffer structure 20 includes multiple buffer structures 20, each having a glue injection point 21. Therefore, glue can be injected simultaneously from multiple glue injection points 21, thereby improving injection molding efficiency and quality. Specifically, all buffer structures 20 are arranged at intervals along the circumference of the shell structure 10, or all buffer structures 20 are arranged at intervals along the axial direction of the shell, or multiple buffer structures 20 are arranged at intervals along the circumference of the shell structure 10 and simultaneously at intervals along the axial direction of the shell structure 10.

[0069] In one specific embodiment, multiple buffer structures 20 are arranged in multiple groups. Each group of buffer structures 20 includes two buffer structures 20, which are respectively disposed at both ends of the shell structure 10 in the circumferential direction. That is, the two buffer structures 20 in each group are located at the edge of the opening 11 of the semi-cylinder. Furthermore, the multiple groups of buffer structures 20 are spaced apart along the axial direction of the shell structure 10, so that glue can be simultaneously injected through multiple glue inlets 40 on the multiple groups of buffer structures 20, thereby improving the production efficiency of the shell parts.

[0070] In some embodiments of this application, the mating housing 30 is also semi-cylindrical, so that the mating housing 30 and the housing component can be spliced ​​together to form a complete cylindrical structure. In other embodiments, the mating housing 30 can also be a plate-like structure, as long as the mating housing 30 can close the opening 11 of the housing component.

[0071] The mating housing 30 includes a stepped portion 31, which protrudes from the end face of the mating housing 30 for splicing with the housing structure 10. When the mating housing 30 and the housing structure 10 are spliced, the stepped portion 31 extends into the inlet opening 11. Thus, the protruding stepped portion 31 limits the splicing of the mating housing 30 and the housing structure 10. When the inner wall of the housing structure 10 abuts against the stepped portion 31, it indicates that the housing structure 10 and the mating housing 30 are aligned, facilitating their mutual fixation.

[0072] For further details, please refer to [link / reference]. Figure 15 and Figure 16 The two end faces of the mating housing 30 for splicing with the housing component are provided with stepped portions 31. When the mating housing 30 and the housing structure 10 are spliced ​​together, the inner wall of the housing structure 10 is respectively connected to the side of each stepped portion 31 facing the other stepped portion 31, thereby limiting the position of the housing component through the two stepped portions 31 and improving the assembly efficiency of the housing component and the mating housing 30.

[0073] In specific examples, to avoid interference between the buffer structure 20 on the shell structure 10 and the stepped portion 31, multiple stepped structures are provided, all spaced apart along the extension direction of the mating shell 30, which is the axial direction of the semi-cylinder. A clearance notch 32 is formed between adjacent stepped portions 31. When the mating shell 30 and the shell structure 10 are joined together, the buffer structure 20 is located within the clearance notch 32, thereby preventing interference between the buffer structure 20 and the stepped portion 31.

[0074] In actual use, if the fit between the housing component and the mating housing 30 is not tight, the end face of the mating housing 30 and the end face of the housing structure 10 will not be able to fit completely tightly, resulting in gaps in some areas. If the gap is near the stepped portion 31, the stepped portion 31 can provide some shielding to prevent external dust or moisture from entering the housing structure 10 or the interior of the mating housing 30. However, if the gap is located at the clearance notch 32, the stepped portion 31 cannot prevent external dust or moisture from entering the housing structure 10 or the interior of the mating housing 30 through the gap.

[0075] Therefore, the housing structure 10 has an end face for interlocking with the mating housing 30. This end face has a chamfer 22 between it and the buffer structure 20. The mating housing 30 includes a blocking portion 33, which protrudes from the end face of the mating housing 30 for interlocking with the housing structure 10 and is located within the clearance notch 32. The blocking portion 33 abuts against the chamfer 22. Thus, even if the gap formed between the end face of the mating housing 30 and the end face of the housing structure 10 is close to the clearance notch 32, the blocking portion 33 will block the gap, preventing external dust or moisture from entering the housing structure 10 or the interior of the mating housing 30 through the gap.

[0076] Furthermore, based on the aforementioned housing component, this application embodiment also provides an injection mold, see reference. Figure 11 , Figure 12 , Figure 13 and Figure 14 The injection mold is used for injection molding the housing part as described in any of the above embodiments. The injection mold includes a main body space, a buffer space, and a sprue 40. The main body space is used for injection molding the main structure of the housing part. The buffer space is connected to the main body space and is used to mold the buffer structure 20. The sprue 40 is connected to the end of the buffer space away from the main body space. Molten plastic enters the buffer space and the main body space from the sprue 40, and after the housing part is injection molded, the sprue 40 is directly opposite the injection point 21 of the buffer structure 20.

[0077] Specifically, the injection mold includes a fixed mold part, a moving mold part, and 41 inclined ejectors. The moving mold part can be controlled to move closer to or further away from the fixed mold part. The 41 inclined ejectors are movably mounted on the moving mold part, and the direction of movement of the 41 inclined ejectors relative to the moving mold part intersects with the direction of movement of the moving mold part relative to the fixed mold part. The fixed mold part, the moving mold part, and the 41 inclined ejectors can be joined together to form a main body space and a buffer space. The 41 inclined ejectors are provided with a gate 40.

[0078] After the housing part is formed in the injection mold, the moving mold part drives the inclined ejector 41 part to separate from the fixed mold, thereby separating the top of the housing part from the fixed mold part. Then the inclined ejector 41 part moves relative to the moving mold part, so that the inclined ejector 41 part separates from the buffer structure 20 and the inner wall of the housing part, thereby causing the housing part to fall off the moving mold part.

[0079] The mold body also includes a hot runner 42, a first cold runner 43, a first cold gate, and a second cold runner. The hot runner 42 is connected to the first cold runner 43, the first cold runner 43 is connected to the first cold gate 44, the first cold gate 44 is connected to the second cold runner 45, and the second cold runner 45 is connected to the sprue 40. Molten plastic enters the sprue 40 through the first cold runner 43, the first cold gate 44, and the second cold runner 45, finally filling the main body space and the buffer space, completing the injection molding of the shell part. The first cold runner 43 and the second cold runner 45 are arranged with intersecting extension directions, which buffers the flow rate of the molten plastic as it enters the second cold runner 45, allowing the molten plastic to be evenly distributed in the main body space and the buffer space, improving the quality of the injection molding.

[0080] The aforementioned housing component has at least the following advantages:

[0081] By setting the injection point 21 at the end of the buffer structure 20 away from the housing part, the hot-melt plastic will not directly impact the outer surface of the housing part during the injection molding process, thereby eliminating the stress between the molecular chains of cooling shrinkage and avoiding shrinkage marks and bright spots on the outer surface of the housing part.

[0082] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A housing component, characterized in that, The housing component includes: The shell structure (10) has an opening (11) that communicates with its own interior; The buffer structure (20) has one end located on the inner wall of the shell structure (10), and the other end extends away from the shell structure (10). The buffer structure (20) is integrally injection molded with the shell structure (10), and the end of the buffer structure (20) away from the shell structure (10) has a glue injection point (21).

2. The housing component according to claim 1, characterized in that, The buffer structure (20) is located at the edge of the opening (11) of the shell structure (10).

3. The housing component according to claim 2, characterized in that, The shell structure (10) has an end face for splicing with the mating shell (30), and the end face has a chamfer (22) between it and the buffer structure (20).

4. The housing component according to claim 1, characterized in that, The shell structure (10) is semi-cylindrical, and one end of the buffer structure (20) is located on the inner wall of the shell structure (10), while the other end extends toward the axis of the shell structure (10).

5. The housing component according to claim 4, characterized in that, The buffer structure (20) includes multiple buffer structures (20), and all the buffer structures (20) are arranged at intervals along the circumferential direction of the shell structure (10); And / or, all of the buffer structures (20) are arranged at intervals along the axial direction of the shell structure (10).

6. A housing assembly, characterized in that, Includes the housing component as described in any one of claims 1-5.

7. The housing assembly according to claim 6, characterized in that, The housing assembly further includes a mating housing (30) that can be spliced ​​with the housing structure (10) and the mating housing (30) closes the opening (11) of the housing structure (10).

8. The housing assembly according to claim 7, characterized in that, The mating housing (30) includes a stepped portion (31), which protrudes from the end face of the mating housing (30) for splicing with the housing structure (10), and when the mating housing (30) is spliced ​​with the housing structure (10), the stepped portion (31) extends into the opening (11).

9. The housing assembly according to claim 8, characterized in that, The stepped portion (31) includes multiple portions, all of which are arranged at intervals along the extension direction of the mating shell (30), and a clearance gap (32) is formed between two adjacent stepped portions (31). When the mating shell (30) is spliced ​​with the shell structure (10), the buffer structure (20) is located in the clearance gap (32).

10. The housing assembly according to claim 9, characterized in that, The shell structure (10) has an end face for splicing with the mating shell (30), and the end face has a chamfer (22) between it and the buffer structure (20); The mating housing (30) includes a blocking part (33), which protrudes from the end face of the mating housing (30) for splicing with the housing structure (10) and is located within the clearance notch (32). The blocking part (33) abuts against the chamfer (22).

11. A household appliance, characterized in that, Includes the housing assembly as described in any one of claims 6-10.

12. An injection mold for injection molding a housing part as described in any one of claims 1-5, characterized in that, The injection mold includes: The main space is the main structure used for injection molding shell parts; A buffer space, connected to the main body space, is used for injection molding the buffer structure (20); The glue inlet (40) is connected to the end of the buffer space that is away from the main body space.

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