A supplementary fastening device

Abstract

The utility model discloses a kind of auxiliary buckling devices, the device includes: seat, one end is provided with conical cylindrical boss;Elastic reset member is set to the circumferential side of the conical cylindrical boss;When assembling, the inner bag is sleeved on the outside of the conical cylindrical boss, and the shell is sleeved on the inner bag, by the axial force of the shell towards the seat direction is applied, the conical cylindrical boss radially expands the female buckle, so that the female buckle after pre-expansion and the male buckle complete buckling;After stopping to apply axial force, the inner bag and the shell of integration are moved along the direction of away from the seat under the restoring force of the elastic reset member, and automatically disengage with the conical cylindrical boss.The utility model in, by setting seat with conical cylindrical boss and the elastic reset member of circumferential side, effectively solved the assembly difficult problem caused by misalignment, male buckle inelastic during the buckling process of inner bag and shell.

Description

Technical Field

[0001] This utility model relates to the field of assembly tooling technology, and further to an auxiliary fastening device. Background Technology

[0002] In modern industrial products, especially in the fields of daily necessities, home appliances, consumer electronics, and automotive parts, snap-fit ​​connections are widely used due to their advantages such as convenient installation, no need for additional fasteners, and aesthetic appeal. One of our company's products uses a snap-fit ​​structure to assemble the inner liner and outer shell. The male snap-fit ​​is located on the outer shell, and the female snap-fit ​​is located on the inner liner, requiring axial compression to achieve the connection.

[0003] However, the existing assembly process has the following problems: First, neither the male nor female buckle is designed with guide bevels or chamfers, so there is no effective radial guidance when they first come into contact. Alignment relies entirely on operators or robotic arms, requiring extremely high positioning accuracy. Second, the male buckle is made of rigid material and does not have any elastic deformation capability, so it cannot compensate for minor alignment errors through deformation during the fastening process.

[0004] In actual production, the aforementioned defects make the fastening process extremely prone to failure due to minute radial misalignment or angular deviation. The tip of the male fastener may strike the upper edge of the female fastener instead of smoothly entering, resulting in unsuccessful fastening, or even scratching or damaging the fastening teeth, leading to scrapped parts. This problem prevents the production line from achieving stable, continuous, and 100% fastening, heavily relying on manual intervention for secondary adjustments or separating scrapped products. This not only results in low production efficiency and difficulty in guaranteeing product yield, but also significantly increases the company's labor costs and production losses, hindering the product's cost competitiveness and market benefits.

[0005] Therefore, it is necessary to design an auxiliary fastening device to solve the above problems. Utility Model Content

[0006] To address the aforementioned technical problems, the purpose of this utility model is to provide an auxiliary fastening device. By setting a seat with a conical cylindrical boss and elastic reset parts on the periphery, it effectively solves the assembly difficulties caused by misalignment and lack of elasticity in the male fastener during the fastening process between the inner liner and the outer shell.

[0007] To achieve the above objectives, this utility model provides an auxiliary fastening device for assisting in the assembly process of the inner liner and the outer shell, wherein the inner liner is provided with a female fastener and the outer shell is provided with a male fastener, comprising:

[0008] The base has a conical cylindrical protrusion at one end;

[0009] An elastic reset element is disposed on the periphery of the conical cylindrical boss;

[0010] During assembly, the inner liner is fitted onto the outside of the conical cylindrical boss, and the outer shell is fitted onto the inner liner. By applying an axial force to the outer shell in the direction of the seat, the conical cylindrical boss radially expands the female buckle, so that the pre-expanded female buckle and the male buckle are engaged.

[0011] After the axial force is stopped, the inner liner and the outer shell, which are assembled as a whole, move away from the seat body under the restoring force of the elastic reset member, and automatically disengage from the conical cylindrical boss.

[0012] In some embodiments, the outer side of the end of the conical cylindrical boss has a guide slope, the angle between the guide slope and the axial direction of the conical cylindrical boss is 15°-45°, and the axial height of the guide slope is 40mm-60mm.

[0013] In some embodiments, the angle between the guide ramp and the axial direction of the conical cylindrical boss is 30°, and the axial height of the guide ramp is 50mm.

[0014] In some embodiments, the resilient reset member includes a top block and an elastic element. The top block is disposed around the periphery of the conical cylindrical boss and connected to the seat body via the elastic element. The top block is configured to support the inner liner or the outer shell under the action of the elastic element.

[0015] In some embodiments, the base body is provided with an annular platform at one end near the conical cylindrical boss, and the annular platform surrounds the periphery of the conical cylindrical boss.

[0016] The top block has an annular structure and is fitted onto the outside of the conical cylindrical boss. The elastic element is disposed between the annular platform and the top block.

[0017] In some embodiments, multiple elastic elements are provided, and the multiple elastic elements are evenly spaced along the circumference of the top block.

[0018] In some embodiments, the elastic element includes a spring;

[0019] The annular platform is provided with multiple spring grooves, and each of the multiple spring grooves corresponds to a multiple of the springs;

[0020] One end of each spring is fitted into the corresponding spring slot, and the other end extends out of the spring slot and abuts against the top block.

[0021] In some embodiments, the elastic element further includes a guide post, one end of which is provided with a limiting boss, the outer diameter of which is larger than the outer diameter of the guide post;

[0022] The bottom of the spring groove is provided with a guide hole, the inner diameter of which is larger than the outer diameter of the guide post and smaller than the outer diameter of the limiting boss.

[0023] The end of the guide post furthest from the limiting boss passes through the guide hole and the inner cavity of the spring in sequence, and is connected to the top block.

[0024] In some embodiments, mounting holes are provided on the top block corresponding to the position of each guide post;

[0025] A screw hole is provided at the end of the guide post away from the limiting boss;

[0026] Fasteners pass through the mounting hole and are threaded into the screw hole to detachably connect the guide post to the top block.

[0027] In some implementations, it also includes:

[0028] The pressing mechanism is located above the conical cylindrical boss and is used to apply an axial pressure of a preset magnitude toward the housing in the direction of the seat.

[0029] Compared with the prior art, the auxiliary fastening device provided by this utility model has the following beneficial effects:

[0030] In this invention, during assembly, by applying axial pressure to the outer shell, the conical cylindrical boss can radially expand the female buckle, allowing it to pre-expand and smoothly engage with the male buckle, greatly improving the success rate and stability of engagement. After engagement, under the action of the elastic reset component, the product can automatically detach from the device, avoiding efficiency loss and component damage caused by manual separation. The device has a reasonable structure and is easy to operate, significantly improving assembly efficiency and product yield, and reducing production costs. Attached Figure Description

[0031] The optional embodiments will be described below in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0032] Figure 1 This is a schematic diagram of the auxiliary fastening device of an optional embodiment of this utility model;

[0033] Figure 2 This is a partial structural schematic diagram of the auxiliary fastening device of an optional embodiment of this utility model.

[0034] Explanation of icon numbers:

[0035] Inner liner 1, female buckle 11, outer shell 2, male buckle 21, seat 3, conical cylindrical boss 31, guide slope 311, annular platform 32, spring groove 321, elastic reset component 4, top block 41, mounting hole 411, spring 42, guide post 43, limiting boss 431, fastener 44. Detailed Implementation

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0037] To keep the drawings concise, each figure only schematically shows the parts relevant to the utility model, and these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0038] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0039] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Our company manufactures a cosmetic bottle that uses a snap-fit ​​assembly method between the inner liner and outer shell. The male snap-fit ​​is located on the outer shell, and the female snap-fit ​​is located on the inner liner, requiring axial compression to achieve the connection. However, the existing assembly process has the following problems: First, neither the male nor female snap-fit ​​is designed with guide bevels or chamfers. There is a lack of effective radial guidance during initial contact, relying entirely on operators or robotic arms for alignment, which requires extremely high positioning accuracy. Second, the male snap-fit ​​is made of rigid material and lacks any elastic deformation capability, making it impossible to compensate for minor alignment errors through deformation during the connection process. In actual production, these defects make the connection process highly susceptible to failure due to minute radial misalignment or angular deviation. The tip of the male snap-fit ​​may strike the upper edge of the female snap-fit ​​instead of smoothly entering, resulting in unsuccessful connection, or even scratching or damaging the snap teeth, leading to the scrapping of the part. This problem prevents the production line from achieving stable and continuous 100% engagement, heavily relying on manual intervention for secondary adjustments or separating scrapped products. This not only results in low production efficiency and difficulty in guaranteeing product yield, but also significantly increases the company's labor costs and production losses, thus restricting the product's cost competitiveness and market benefits.

[0042] To address the aforementioned problems, in one embodiment, reference is made to the appendix to the specification. Figure 1 , Figure 2 This utility model provides an auxiliary fastening device for assisting in the assembly process of an inner liner 1 and an outer shell 2. The inner liner 1 is provided with a female fastener 11, and the outer shell 2 is provided with a male fastener 21. The device includes a base 3 and an elastic reset member 4. One end of the base 3 is provided with a conical cylindrical boss 31. The elastic reset member 4 is disposed on the periphery of the conical cylindrical boss 31. During assembly, the inner liner 1 is fitted onto the outside of the conical cylindrical boss 31, and the outer shell 2 is fitted onto the inner liner 1. By applying an axial force to the outer shell 2 toward the base 3, the conical cylindrical boss 31 radially expands the female fastener 11, so that the pre-expanded female fastener 11 and the male fastener 21 are fastened together. After the axial force is stopped, the inner liner 1 and the outer shell 2, which are assembled as a whole, move away from the base 3 under the restoring force of the elastic reset member 4 and automatically disengage from the conical cylindrical boss 31.

[0043] In this invention, during assembly, by applying axial pressure to the outer shell 2, the conical cylindrical boss 31 can radially expand the female buckle 11, allowing it to pre-expand and smoothly engage with the male buckle 21, greatly improving the success rate and stability of engagement. After engagement, under the action of the elastic reset member 4, the product can automatically detach from the device, avoiding efficiency loss and component damage caused by manual separation. The device has a reasonable structure and is easy to operate, significantly improving assembly efficiency and product yield, and reducing production costs.

[0044] In one embodiment, refer to the appendix to the specification. Figure 1 , Figure 2The outer side of the tapered cylindrical boss 31 has a guide slope 311. The angle between the guide slope 311 and the axial direction of the tapered cylindrical boss 31 is 15°-45°, and the axial height of the guide slope 311 is 40mm-60mm. By setting a guide slope 311 with a specific angle range on the outer side of the tapered cylindrical boss 31, it can smoothly contact the outer wall of the female buckle 11 in the initial stage of assembly and generate an appropriate radial force, thereby reliably guiding the female buckle 11 to pre-expand. The guide slope 311 with a specific height range ensures that the female buckle 11 receives sufficient and stable support and guidance throughout the expansion process.

[0045] For example, the angle between the guide ramp 311 and the axial direction of the conical cylindrical boss 31 is 30°, and the axial height of the guide ramp 311 is 50mm. This specific angle provides a suitable radial force during the fastening process, ensuring that the female buckle 11 can undergo smooth and uniform elastic pre-expansion. This avoids insufficient expansion force due to an excessively small angle, and also prevents excessive stress or permanent deformation of the female buckle 11 that may occur due to an excessively large angle. Furthermore, for a certain cosmetic bottle of our company, the 50mm ramp height provides sufficient guiding stroke for the female buckle 11, ensuring that the female buckle 11 receives continuous and stable radial support and precise guidance throughout the entire process from initial contact to complete fastening.

[0046] In one embodiment, refer to the appendix to the specification. Figure 1 , Figure 2 The elastic reset member 4 includes a top block 41 and an elastic element. The top block 41 is arranged around the conical cylindrical boss 31 and connected to the seat 3 via the elastic element. The top block 41 is configured to hold the inner liner 1 or the outer shell 2 under the action of the elastic element. Driven by the elastic element, the top block 41 can reliably hold the inner liner 1 and / or the outer shell 2, completely separating it from the conical cylindrical boss 31, effectively preventing the product from sticking or remaining on the seat 3.

[0047] Specifically, the base 3 has an annular platform 32 at one end near the conical cylindrical boss 31, which surrounds the periphery of the conical cylindrical boss 31. The top block 41 is annular and is fitted around the outside of the conical cylindrical boss 31. An elastic element is positioned between the annular platform 32 and the top block 41. The annular top block structure can simultaneously act on the entire circumference of the inner liner 1 or the outer shell 2, providing a balanced and stable holding force, effectively preventing the product from tilting or jamming during ejection, and ensuring smooth and reliable demolding. The annular platform 32 provides a stable mounting base for the elastic element, ensuring the structural stability and durability of the entire elastic reset system during repeated operation. Of course, the top block 41 can also adopt a split structure or other structures.

[0048] The device includes multiple elastic elements, which are evenly spaced along the circumference of the top block 41. The number of elastic elements can be 3, 4, 5, or more. The combined action of multiple elastic elements completely eliminates the risk of uneven load that may be caused by single-point force application, ensuring that the inner liner 1 and the outer shell 2 maintain stable linear movement during demolding, effectively preventing product jamming or tilting.

[0049] For example, refer to the appendix to the instruction manual. Figure 2 The elastic element includes a spring 42; multiple spring slots 321 are formed on the annular platform 32, and each spring slot 321 corresponds to a spring 42; one end of each spring 42 is fitted into the corresponding spring slot 321, and the other end extends out of the spring slot 321 and abuts against the top block 41. The insertion of one end of the spring 42 into the spring slot 321 effectively prevents it from shifting or twisting during operation, ensuring the vertical transmission of elastic force; the other end abuts against the top block 41, efficiently and evenly converting the elastic force into an ejection action.

[0050] Furthermore, the elastic element also includes a guide post 43, one end of which is provided with a limiting boss 431, the outer diameter of which is larger than the outer diameter of the guide post 43. A guide hole is provided at the bottom of the spring groove 321, the inner diameter of which is larger than the outer diameter of the guide post 43 but smaller than the outer diameter of the limiting boss 431. The end of the guide post 43 away from the limiting boss 431 passes through the guide hole and the inner cavity of the spring 42 in sequence, and connects to the top block 41. The guide post 43 passing through the inner cavity of the spring 42 and connecting to the top block 41 provides precise axial guidance for the compression and rebound of the spring 42, effectively preventing the spring 42 from bending or shifting laterally during operation, ensuring the verticality and uniformity of the ejection force. The design of the limiting boss 431 and the guide hole ensures that the guide post 43 can slide freely while limiting its stroke range, enhancing the reliability and durability of the system.

[0051] Furthermore, mounting holes 411 are provided on the top block 41 corresponding to the positions of each guide post 43; a screw hole is provided at the end of the guide post 43 away from the limiting boss 431; a fastener 44 passes through the mounting hole 411 and is threaded into the screw hole to detachably connect the guide post 43 to the top block 41. The detachable structural design facilitates quick replacement or maintenance of individual guide posts 43 or springs 42 without replacing the entire top block module, significantly reducing the maintenance cost and ease of use of the equipment.

[0052] It should be noted that the specific structure of the elastic reset member 4 is described in accordance with the accompanying drawings. In actual use, other reset structures, such as elastic columns, can also be used, as long as they can achieve the above functions. This is only for better illustrating the present invention and should not be construed as a limitation of the present invention.

[0053] In one embodiment, the auxiliary fastening device further includes a pressing mechanism disposed above the conical cylindrical boss 31, for applying a preset axial pressure to the housing 2 in the direction of the seat 3. The pressing mechanism disposed above the conical cylindrical boss 31 applies a preset axial pressure to the housing 2, ensuring uniform force in each fastening action and completely eliminating the problems of unstable force or angular deviation that may occur with manual operation. This not only significantly improves the success rate of fastening and product consistency but also effectively reduces the labor intensity and skill dependence of operators, making the production process more efficient and reliable, and suitable for large-scale application in automated production lines.

[0054] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0055] It should be noted that the above embodiments can be freely combined as needed. The above are only optional embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An auxiliary fastening device for providing assistance during the assembly process of the inner liner and the outer shell, wherein, The inner liner is provided with a female buckle, and the outer shell is provided with a male buckle, characterized in that it includes: The base has a conical cylindrical protrusion at one end; An elastic reset element is disposed on the periphery of the conical cylindrical boss; During assembly, the inner liner is fitted onto the outside of the conical cylindrical boss, and the outer shell is fitted onto the inner liner. By applying an axial force to the outer shell in the direction of the seat, the conical cylindrical boss radially expands the female buckle, so that the pre-expanded female buckle and the male buckle are engaged. After the axial force is stopped, the inner liner and the outer shell, which are assembled as a whole, move away from the seat body under the restoring force of the elastic reset member, and automatically disengage from the conical cylindrical boss.

2. The auxiliary fastening device according to claim 1, characterized in that, The outer side of the end of the conical cylindrical boss has a guide slope, the angle between the guide slope and the axial direction of the conical cylindrical boss is 15°-45°, and the axial height of the guide slope is 40mm-60mm.

3. The auxiliary fastening device according to claim 2, characterized in that, The angle between the guide ramp and the axis of the conical cylindrical boss is 30°, and the axial height of the guide ramp is 50mm.

4. The auxiliary fastening device according to any one of claims 1-3, characterized in that, The elastic reset member includes a top block and an elastic element. The top block is arranged on the periphery of the conical cylindrical boss and connected to the seat body through the elastic element. The top block is configured to support the inner liner or the outer shell under the action of the elastic element.

5. The auxiliary fastening device according to claim 4, characterized in that, The base body is provided with an annular platform at one end near the conical cylindrical boss, and the annular platform surrounds the periphery of the conical cylindrical boss. The top block has an annular structure and is fitted onto the outside of the conical cylindrical boss. The elastic element is disposed between the annular platform and the top block.

6. The auxiliary fastening device according to claim 5, characterized in that, The elastic element is provided in multiple ways, and the multiple elastic elements are evenly spaced along the circumference of the top block.

7. The auxiliary fastening device according to claim 6, characterized in that, The elastic element includes a spring; The annular platform is provided with multiple spring grooves, and each of the multiple spring grooves corresponds to a multiple of the springs; One end of each spring is fitted into the corresponding spring slot, and the other end extends out of the spring slot and abuts against the top block.

8. The auxiliary fastening device according to claim 7, characterized in that, The elastic element also includes a guide post, one end of which is provided with a limiting boss, the outer diameter of which is larger than the outer diameter of the guide post. The bottom of the spring groove is provided with a guide hole. The inner diameter of the guide hole is larger than the outer diameter of the guide post and smaller than the outer diameter of the limiting boss. The end of the guide post away from the limiting boss passes through the guide hole and the inner cavity of the spring in sequence, and is connected to the top block.

9. The auxiliary fastening device according to claim 8, characterized in that, The top block has mounting holes corresponding to the positions of each guide post; A screw hole is provided at the end of the guide post away from the limiting boss; Fasteners pass through the mounting hole and are threaded into the screw hole to detachably connect the guide post to the top block.

10. The auxiliary fastening device according to claim 1, characterized in that, Also includes: The pressing mechanism is located above the conical cylindrical boss and is used to apply an axial pressure of a preset magnitude toward the housing in the direction of the seat.

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