Ultrasonic plastic welding structure

Abstract

The ultrasonic plastic welding structure comprises an upper welding shell and a lower welding shell which are sequentially arranged from top to bottom, the upper welding shell is of a hollow structure with a downward opening, and the lower welding shell is of a hollow structure with an upward opening; a protrusion is arranged on the lower surface of the shell wall of the upper welding shell in a protruding mode, the protrusion is arranged in the circumferential direction of the shell wall of the upper welding shell, and the protrusion is located in the center of the bottom of the shell wall of the upper welding shell. A mounting step is arranged at the top of the shell wall of the lower welding shell, a groove is formed in the upper surface of the mounting step in an inward concave mode, the groove is formed in the circumferential direction of the mounting step, and the groove is located in the inner side of the top of the mounting step; and the bulge is mounted in the groove. According to the ultrasonic plastic welding structure, the problem that plastic overflows in the ultrasonic welding process can be solved, the smoothness and attractiveness of a welded product are improved, the hands of a user are prevented from being scratched, and the strength and stability of the welded product can be improved.

Description

Technical Field

[0001] This utility model relates to the field of plastic welding technology, and in particular to an ultrasonic plastic welding structure. Background Technology

[0002] Currently, transparent and brittle plastics such as PC, PS, ABS, and PMMA are often used as key components due to their visibility and sealing properties. During the manufacturing process of these parts, it is usually necessary to fuse the interface of two plastic components into a single unit using heating. Ultrasonic plastic welding technology, with its speed, cleanliness, and efficiency, has been widely used in the field of plastic component welding.

[0003] The working principle of ultrasonic plastic welding is as follows: Starting the ultrasonic machine generates ultrasonic vibrations. These vibrations are converted into mechanical motion of the same frequency by a transducer. This mechanical motion is then transmitted through an amplitude modulator and ultimately acts on the welding head. The welding head applies this mechanical motion to the interface between two plastic parts, causing friction and heat to be generated at the interface. When the temperature reaches the melting point of the plastic, it begins to melt and flow. At this point, applying a certain pressure will fuse the interface between the two plastic parts together. After the ultrasonic waves stop, the molten plastic gradually cools and solidifies, forming strong molecular chain connections, thus completing the weld.

[0004] However, there is a significant problem with ultrasonic welding: because the interface between two plastic parts is usually relatively smooth, when subjected to ultrasonic vibration, the plastic at the interface melts and flows, causing some of the molten plastic to overflow from the gaps. After cooling and solidifying, this overflowing molten plastic forms a ring of plastic particles around the welded area. These plastic particles not only affect the product's appearance and smoothness but may also cause scratches to the user's hands during use.

[0005] Therefore, how to effectively solve the problem of plastic overflow during ultrasonic welding and improve the smoothness and aesthetics of the welded product has become a key challenge that ultrasonic welding technology urgently needs to overcome. Utility Model Content

[0006] The purpose of this invention is to propose an ultrasonic plastic welding structure that can not only solve the problem of plastic overflow during ultrasonic welding, improve the smoothness and aesthetics of the welded product, and prevent scratches to users' hands, but also improve the strength and stability of the welded product, thus overcoming the shortcomings of the prior art.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] An ultrasonic plastic welding structure includes an upper welding shell and a lower welding shell arranged sequentially from top to bottom. The upper welding shell is a hollow structure with an opening facing downwards, and the lower welding shell is a hollow structure with an opening facing upwards.

[0009] The lower surface of the shell wall of the upper welded shell is provided with a protrusion, the protrusion is arranged circumferentially along the shell wall of the upper welded shell, and the protrusion is located at the center of the bottom of the shell wall of the upper welded shell;

[0010] The top of the shell wall of the lower welded shell is provided with an installation step, and the upper surface of the installation step is recessed inward with a groove. The groove is arranged circumferentially along the installation step and is located on the inner side of the top of the installation step.

[0011] The protrusion is installed inside the groove.

[0012] Furthermore, the edge of the lower welded housing is provided with a housing portion and a protrusion arranged sequentially from the inside to the outside, and the housing portion and the protrusion together form the mounting step, with the groove located on the top inner side of the protrusion.

[0013] Furthermore, the inner wall of the groove is flush with the outer wall of the housing portion.

[0014] Furthermore, the cross-sectional shape of the protrusion is any one of a triangle, a semicircle, an isosceles trapezoid, and a semi-ellipse.

[0015] Furthermore, the cross-sectional shape of the groove is any one of a triangle, a semicircle, a right trapezoid, and a semi-ellipse.

[0016] Furthermore, the cross-sectional shape of the protrusion 11 is an inverted isosceles trapezoid;

[0017] The groove has an inverted right trapezoidal cross-section, with the hypotenuse of the trapezoid located close to the edge of the protrusion.

[0018] Furthermore, the height of the isosceles trapezoid is greater than the height of the right trapezoid, and the length of the upper side of the isosceles trapezoid is less than the length of the upper side of the right trapezoid.

[0019] Furthermore, the height of the isosceles trapezoid is 0.35–0.45 mm, the length of the upper side is 0.55–0.65 mm, and the length of the lower side is 0.08–0.15 mm;

[0020] The height of the right trapezoid is 0.15–0.25 mm, the length of the upper side is 0.85–0.95 mm, and the length of the lower side is 0.45–0.55 mm.

[0021] Furthermore, the obtuse angle of the isosceles trapezoid is the same as that of the right trapezoid, and the angle of the right trapezoid is 115° to 125°.

[0022] Furthermore, the obtuse angle of the right trapezoid is 120°.

[0023] The technical solution provided by this utility model can include the following beneficial effects:

[0024] 1. During ultrasonic welding, the ultrasonic machine starts and generates high-frequency vibrations. These high-frequency vibrations are converted into mechanical motion of the same frequency by a transducer and then transmitted to the welding head via an amplitude modulator. The welding head applies mechanical vibrations to the protrusions of the upper welding shell and the grooves of the lower welding shell, causing the plastic at the protrusions and grooves to generate heat due to friction. When the temperature reaches the melting point of the plastic, it begins to melt and flow. At this time, a certain pressure is applied so that the molten plastic at the protrusions can fully fill the grooves. At the same time, the design of the grooves effectively limits the flow range of the molten plastic itself, preventing it from overflowing. In addition, the design of the mounting steps further limits the overflow of molten plastic. These multiple effects help reduce the formation of plastic particles around the welded area, thereby improving the smoothness and aesthetics of the welded product and avoiding scratches to the user's hands.

[0025] 2. The protrusion is located at the bottom center of the upper welded shell wall, and the groove is located on the top inner side of the mounting step. This design not only avoids the problem of glue overflow that may occur when the two are located at the edge, thus further reducing the overflow of plastic and the formation of plastic particles during welding, significantly improving the aesthetics and smoothness of the product, but also helps to disperse the stress generated during welding, reducing welding defects caused by stress concentration, thereby improving the strength of the product after welding. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an ultrasonic plastic welding structure according to this utility model.

[0027] Figure 2 This is an exploded view of an ultrasonic plastic welding structure according to this utility model.

[0028] Figure 3 This is another exploded view of an ultrasonic plastic welding structure according to this utility model.

[0029] Figure 4 This is a cross-sectional view of an ultrasonic plastic welding structure according to this utility model.

[0030] Figure 5 This utility model relates to an ultrasonic plastic welding structure. Figure 4 A magnified view of point m in the middle.

[0031] Figure 6 This utility model relates to an ultrasonic plastic welding structure. Figure 4 A magnified view of point n in the image.

[0032] Among them: upper welded shell 1, protrusion 11, lower welded shell 2, groove 21, shell part 22, protrusion 23. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] This technical solution provides an ultrasonic plastic welding structure, including an upper welding shell 1 and a lower welding shell 2 arranged sequentially from top to bottom. The upper welding shell 1 is a hollow structure with an opening facing downwards, and the lower welding shell 2 is a hollow structure with an opening facing upwards.

[0035] The lower surface of the shell wall of the upper welded shell 1 is provided with a protrusion 11, the protrusion 11 is arranged circumferentially along the shell wall of the upper welded shell 1, and the protrusion 11 is located at the bottom center of the shell wall of the upper welded shell 1.

[0036] The top of the shell wall of the lower welded shell 2 is provided with an installation step, and the upper surface of the installation step is recessed inward with a groove 21. The groove 21 is arranged circumferentially along the installation step and is located on the inner side of the top of the installation step.

[0037] The protrusion 11 is installed inside the groove 21.

[0038] To address the issue of plastic overflow during ultrasonic welding, this technical solution provides an ultrasonic plastic welding structure, such as... Figure 1-6The ultrasonic welding system comprises an upper welding shell 1 and a lower welding shell 2 arranged sequentially from top to bottom. The lower surface of the upper welding shell 1 has a protrusion 11, and the top of the lower welding shell 2 has an installation step. The upper surface of the installation step has an inwardly recessed groove 21, and the protrusion 11 is installed inside the groove 21. During ultrasonic welding, the ultrasonic machine starts and generates high-frequency vibrations. These high-frequency vibrations are converted into mechanical motion of the same frequency by a transducer and then transmitted to the welding head via an amplitude modulator. The welding head applies mechanical vibrations to the protrusion 11 of the upper welding shell 1 and the groove 21 of the lower welding shell 2, causing the plastic at the protrusion 11 and groove 21 to generate heat due to friction. When the temperature reaches the melting point of the plastic, the plastic begins to melt and flow. At this time, a certain pressure is applied so that the molten plastic at the protrusion 11 can fully fill the groove 21. At the same time, the design of the groove 21 also effectively restricts the flow range of its own molten plastic and prevents it from overflowing. In addition, the design of the installation step further restricts the overflow of molten plastic. The above-mentioned multiple effects help to reduce the formation of plastic particles around the welding part, thereby improving the smoothness and aesthetics of the product after welding and avoiding scratches to the user's hands.

[0039] Furthermore, the protrusion 11 is located at the bottom center of the shell wall of the upper welded housing 1, and the groove 21 is located on the top inner side of the mounting step. This positioning design not only avoids the potential for glue overflow when both are located at the edges, thus further reducing plastic overflow and the formation of plastic particles during welding, significantly improving the product's aesthetics and smoothness, but also helps to disperse the stress generated during welding, reducing welding defects caused by stress concentration, thereby improving the strength of the product after welding.

[0040] Furthermore, the protrusion 11 is arranged circumferentially along the shell wall of the upper welded housing 1, and the groove 21 is arranged circumferentially along the mounting step. The above circumferential design not only significantly enhances the overall strength of the welded product, but also ensures the precise alignment and stability of the upper welded housing 1 and the lower welded housing 2 during the welding process, further reducing the problem of plastic overflow caused by positional deviation.

[0041] In summary, this technical solution, through the cooperation of the protrusion 11 and the groove 21 and by limiting their positions, not only solves the problem of plastic overflow during ultrasonic welding, improves the uniformity of the weld gap and the aesthetics of the product, but also helps to improve the strength and stability of the product after welding.

[0042] To further explain, the lower welded housing 2 is provided with a housing portion 22 and a protrusion 23 arranged sequentially from the inside to the outside, and the housing portion 22 and the protrusion 23 together form the mounting step, and the groove 21 is located on the inner side of the top of the protrusion 23.

[0043] The stacked design of the housing portion 22 and the protrusion 23 gives the lower welded housing 2 a stronger overall structural strength. This design helps to resist external pressure and impact, improving the product's durability and reliability.

[0044] Furthermore, the groove 21 is located on the top inner side of the protrusion 23, which effectively restricts the flow range of the molten plastic, further reducing the possibility of plastic overflow during welding, improving the smoothness and aesthetics of the product after welding, and avoiding scratches to the user's hands.

[0045] To further explain, the inner wall of the groove 21 is flush with the outer wall of the housing portion 22.

[0046] Since the top of the shell wall of the lower welded shell 2 is provided with an installation step, which is formed by the shell part 22 and the protrusion 23, when the inner groove wall is flush with the outer wall of the shell part 22, it is beneficial to further limit the flow range of the molten plastic, further reduce the possibility of the molten plastic overflowing, and thus further ensure the performance of the product.

[0047] To further explain, the cross-sectional shape of the protrusion 11 is any one of a triangle, a semicircle, an isosceles trapezoid, and a semi-ellipse.

[0048] By optimizing the cross-sectional shape of the protrusion 11, different shapes can be selected according to actual application requirements, thereby enhancing the flexibility of product design.

[0049] To further explain, the cross-sectional shape of the groove 21 is any one of a triangle, a semicircle, a right trapezoid, and a semi-ellipse.

[0050] By optimizing the cross-sectional shape of the groove 21, different shapes can be selected according to actual application requirements, thereby enhancing the flexibility of product design.

[0051] To further explain, the cross-sectional shape of the protrusion 11 is an inverted isosceles trapezoid;

[0052] The groove 21 has an inverted right trapezoidal cross-section, and the hypotenuse of the right trapezoid is located close to the edge of the protrusion 23.

[0053] The cross-sectional shape of the protrusion 11 is an isosceles trapezoid, which makes the contact area between the protrusion 11 and the groove 21 larger during the welding process, which helps to increase the strength of the weld and improve the strength and stability of the product after welding.

[0054] Furthermore, the cross-sectional shape of the groove 21 is a right-angled trapezoid, which allows the pressure to be distributed more evenly in the welding area during welding. The hypotenuse in the right-angled trapezoid helps guide the flow of molten plastic and reduces welding defects caused by uneven pressure. In addition, the shapes of isosceles trapezoids and right-angled trapezoids are relatively simple, making them easier to manufacture and process using molds, which helps to reduce production costs and improve production efficiency.

[0055] To further explain, the height of the isosceles trapezoid is greater than the height of the right trapezoid, and the length of the upper side of the isosceles trapezoid is less than the length of the upper side of the right trapezoid.

[0056] The isosceles trapezoid's height is greater than the right trapezoid's height, allowing the protrusion 11 to embed more deeply into the groove 12 during welding. This increases the welding depth and improves the product's post-weld strength and stability. Furthermore, because the upper side of the isosceles trapezoid is shorter than the upper side of the right trapezoid, the contact surface between the protrusion 11 and the groove 21 generates a more concentrated pressure distribution during welding. This ensures sufficient pressure on the welding area, promoting plastic melting and bonding, and guaranteeing a successful weld.

[0057] It should be noted that the height of an isosceles trapezoid is as follows: Figure 6 As shown in Figure A, the upper side of the isosceles trapezoid is as follows: Figure 5 As shown in E, the height of the right trapezoid is as follows Figure 6 As shown in Figure B, the length of the upper side of the right trapezoid is as follows: Figure 5 As shown in F.

[0058] To further explain, the height of the isosceles trapezoid is 0.35–0.45 mm, the length of the upper side is 0.55–0.65 mm, and the length of the lower side is 0.08–0.15 mm.

[0059] The height of the right trapezoid is 0.15–0.25 mm, the length of the upper side is 0.85–0.95 mm, and the length of the lower side is 0.45–0.55 mm.

[0060] The height of the isosceles trapezoid is set within the range of 0.35–0.45 mm to ensure that the protrusion 11 can be fully embedded in the groove 21 during welding, forming a sufficient welding depth. This increases the welding depth and improves the strength and stability of the product after welding. The height of the right trapezoid is 0.15–0.25 mm. Its smaller height helps to form a more concentrated heat and pressure distribution during welding, promoting rapid melting and tight bonding of the plastic.

[0061] The length of the upper side of an isosceles trapezoid is 0.55–0.65 mm, and the length of the lower side is 0.08–0.15 mm (e.g., ...). Figure 6As shown in Figure C), the length of the upper side of the right trapezoid is 0.85–0.95 mm, and the length of the lower side is 0.45–0.55 mm (as shown in Figure C). Figure 6 As shown in Figure D), the upper deformation and lower side length of the isosceles trapezoid are different, as are the upper deformation and lower side length of the right trapezoid, which together contribute to a precise guiding mechanism. This design facilitates precise alignment and positioning of the protrusion 11 and the groove 21 during the welding process.

[0062] To further explain, the obtuse angle of the isosceles trapezoid is the same as that of the right trapezoid, and the angle of the right trapezoid is 115° to 125°.

[0063] The design incorporates obtuse angles in isosceles and right trapezoids, with the angle of the right trapezoid being 115–125° (e.g., ...). Figure 6 As shown in ∠G, this not only provides clearer guidance for the protrusion 11 and groove 21 during the welding process, ensuring welding results, but also makes it easier to achieve precise alignment and positioning when both are at the same angle, reducing the risk of welding deviation and misalignment, and further improving the welding effect.

[0064] To further explain, the obtuse angle of the right trapezoid is 120°.

[0065] By further optimizing the obtuse angle, the melting effect of protrusion 11 and groove 21 is optimized during ultrasonic welding, ensuring the welding effect.

[0066] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0067] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0068] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0069] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0070] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0071] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0072] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. An ultrasonic plastic welding structure, characterized in that: It includes an upper welded shell and a lower welded shell arranged sequentially from top to bottom. The upper welded shell is a hollow structure with an opening facing downwards, and the lower welded shell is a hollow structure with an opening facing upwards. The lower surface of the shell wall of the upper welded shell is provided with a protrusion, the protrusion is arranged circumferentially along the shell wall of the upper welded shell, and the protrusion is located at the center of the bottom of the shell wall of the upper welded shell; The top of the shell wall of the lower welded shell is provided with an installation step, and the upper surface of the installation step is recessed inward with a groove. The groove is arranged circumferentially along the installation step and is located on the inner side of the top of the installation step. The protrusion is installed inside the groove.

2. The ultrasonic plastic welding structure according to claim 1, characterized in that: The lower welded housing has a housing portion and a protrusion arranged sequentially from the inside to the outside, and the housing portion and the protrusion together form the mounting step, with the groove located on the top inner side of the protrusion.

3. The ultrasonic plastic welding structure according to claim 2, characterized in that: The inner wall of the groove is flush with the outer wall of the housing portion.

4. The ultrasonic plastic welding structure according to claim 1, characterized in that: The cross-sectional shape of the protrusion can be any one of a triangle, a semicircle, an isosceles trapezoid, and a semi-ellipse.

5. The ultrasonic plastic welding structure according to claim 1, characterized in that: The cross-sectional shape of the groove can be any one of a triangle, a semicircle, a right trapezoid, or a semi-ellipse.

6. The ultrasonic plastic welding structure according to claim 3, characterized in that: The cross-sectional shape of the protrusion is an inverted isosceles trapezoid; The groove has an inverted right trapezoidal cross-section, with the hypotenuse of the trapezoid located close to the edge of the protrusion.

7. An ultrasonic plastic welding structure according to claim 6, characterized in that: The height of the isosceles trapezoid is greater than the height of the right trapezoid, and the length of the upper side of the isosceles trapezoid is less than the length of the upper side of the right trapezoid.

8. An ultrasonic plastic welding structure according to claim 7, characterized in that: The isosceles trapezoid has a height of 0.35–0.45 mm, a top side length of 0.55–0.65 mm, and a bottom side length of 0.08–0.15 mm. The height of the right trapezoid is 0.15–0.25 mm, the length of the upper side is 0.85–0.95 mm, and the length of the lower side is 0.45–0.55 mm.

9. An ultrasonic plastic welding structure according to claim 7, characterized in that: The isosceles trapezoid and the right trapezoid have the same obtuse angle, and the angle of the right trapezoid is 115° to 125°.

10. An ultrasonic plastic welding structure according to claim 9, characterized in that: The obtuse angle of the right trapezoid is 120°.

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