Ultrasonic welding head, welding device and method

Abstract

The invention provides an ultrasonic welding head, a welding device and a welding method, and relates to the field of earphone manufacturing, the ultrasonic welding head is used for welding a spherical steel mesh and comprises a first welding part and a plurality of second welding parts, the second welding parts are connected to the first welding part and located in the circumferential direction of the first welding part, and the ultrasonic welding head is further provided with a welding face. The welding surface comprises a first binding surface and a plurality of second binding surfaces, the first binding surface is used for binding the convex surface, the first welding part is provided with the first binding surface, each second welding part is provided with the second binding surface, and the second binding surfaces are connected with the first binding surface; a gap is formed between every two adjacent second welding parts, and an avoiding groove is defined. The welding device comprises a fixing base and the ultrasonic welding head, the welding device is used in the welding method for welding the spherical steel mesh, and the ultrasonic welding head, the welding device and the welding method can enable the fixing feet to be welded to the earphone shell more easily.

Description

Technical Field

[0001] This invention relates to the field of headphone manufacturing, and more specifically to ultrasonic welding heads, welding devices, and methods. Background Technology

[0002] The spherical steel mesh is a crucial component in headphones, used to protect the driver unit and optimize sound propagation. Compared to conventional steel mesh, it further reduces standing waves and improves frequency response. Current technology typically uses an ultrasonic welding head to weld the fixing feet located at the flanged edge of the spherical steel mesh to the headphone shell to secure it. However, the welding surface of existing ultrasonic welding heads is a curved surface corresponding to the shape of the spherical steel mesh. At lower welding power, the energy of the ultrasonic welding head is evenly dispersed on the curved surface, making it difficult for the ultrasonic waves to reach the fixing feet, thus hindering their welding to the headphone shell. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes an ultrasonic welding head that makes it easier to weld the fixing feet to the earphone shell.

[0004] The present invention also proposes a welding apparatus having the above-mentioned ultrasonic welding head.

[0005] The present invention also proposes a welding method using the above-described welding apparatus.

[0006] An ultrasonic welding head according to a first aspect of the present invention is used for welding a spherical steel mesh, the spherical steel mesh including a steel mesh body and a plurality of fixed feet, the steel mesh body having a convex surface, the plurality of fixed feet being connected to the steel mesh body and located circumferentially to the steel mesh body, the ultrasonic welding head including a first welding portion and a plurality of second welding portions, the plurality of second welding portions being connected to the first welding portion and located circumferentially to the first welding portion, the ultrasonic welding head further having a welding surface, the welding surface including a first contact surface for contacting the convex surface and a plurality of second contact surfaces, the first welding portion having the first contact surface, each second welding portion having a second contact surface, the second contact surface being in contact with the first contact surface; there is a gap between each pair of adjacent second welding portions, defining a clearance groove.

[0007] The ultrasonic welding head according to embodiments of the present invention has at least the following beneficial effects: when the first and second bonding surfaces are bonded to the steel mesh body, the ultrasonic welding head can transmit ultrasonic waves to the steel mesh body through its own high-frequency vibration, and then transmit them to the fixed feet connected to the circumference of the steel mesh body through the steel mesh body. Since there is a gap between each pair of adjacent second welding portions and a relief groove is defined, the ultrasonic energy of the first bonding surface can be transmitted to the second bonding surface, and the ultrasonic waves are transmitted to the fixed feet through the second bonding surface, thereby increasing the ultrasonic energy transmitted to the fixed feet.

[0008] According to some embodiments of the present invention, the ultrasonic welding head further has a connecting portion connected to the side of each second welding portion away from the first welding portion.

[0009] According to some embodiments of the present invention, the connecting portion protrudes relative to the second mating surface.

[0010] According to some embodiments of the present invention, the impedance of the connection portion is greater than the impedance of the first weld portion.

[0011] According to some embodiments of the present invention, the first bonding surface and the second bonding surface are located on one side of the ultrasonic welding head in a first direction; The ultrasonic welding head further includes a blocking part, which is connected to the connecting part and located on one side of the blocking part in the first direction. The impedance of the blocking part is greater than the impedance of the first welding part.

[0012] According to some embodiments of the present invention, the impedance of the first welded part is greater than the impedance of the second welded part.

[0013] According to some embodiments of the present invention, each of the clearance grooves extends in a direction away from the first weld portion.

[0014] According to some embodiments of the present invention, the spacing between any two adjacent second mating surfaces is the same.

[0015] A welding apparatus according to a second aspect of the present invention, for welding the spherical steel mesh to an earphone housing, comprises: A mounting base is used to secure the spherical steel mesh and the earphone housing. As described in any of the above embodiments, the ultrasonic welding head has its welding surface facing the fixed base, and the ultrasonic welding head is movable toward the fixed base.

[0016] The welding apparatus according to embodiments of the present invention has at least the following beneficial effects: After the fixing base of the welding apparatus fixes the spherical steel mesh and the earphone shell, the ultrasonic welding head can move toward the fixing base and contact the spherical steel mesh, so that the first contact surface and the second contact surface are in contact with the convex surface. Ultrasonic energy is transmitted to the steel mesh body through the first contact surface and the second contact surface used to contact the convex surface, and then the ultrasonic energy is transmitted to the fixing foot. Due to the impedance difference between the clearance groove and the second welding part, the propagation of ultrasonic energy from the first contact surface toward the clearance groove is suppressed, and thus more ultrasonic energy diffuses toward the second contact surface, which is beneficial to make the ultrasonic energy of the second contact surface higher, increasing the ultrasonic energy transmitted to the fixing foot, making it easier for the fixing foot to melt the earphone shell, and thus easier to connect with the earphone shell.

[0017] According to a third aspect embodiment of the present invention, the spherical steel mesh is welded using the welding apparatus as described in any of the above embodiments, and the specific steps are as follows: The spherical steel mesh and the earphone shell are fixed to the fixing base; Bring the ultrasonic welding head close to the fixed base so that the first contact surface and the second contact surface are in contact with the convex surface, and the end of each second welding part away from the first welding part points to at least one of the fixed feet; The ultrasonic welding head applies ultrasonic waves to the steel mesh body to weld the fixing feet to the earphone housing.

[0018] The welding apparatus according to embodiments of the present invention has at least the following beneficial effects: After the fixing base of the welding apparatus fixes the spherical steel mesh and the earphone shell, the ultrasonic welding head can move toward the fixing base and contact the spherical steel mesh, so that the first contact surface and the second contact surface are in contact with the convex surface. Ultrasonic energy is transmitted to the steel mesh body through the first contact surface and the second contact surface used to contact the convex surface, and then the ultrasonic energy is transmitted to the fixing foot. Due to the impedance difference between the clearance groove and the second welding part, the propagation of ultrasonic energy from the first contact surface toward the clearance groove is suppressed, and thus more ultrasonic energy diffuses toward the second contact surface, which is beneficial to make the ultrasonic energy of the second contact surface higher, increasing the ultrasonic energy transmitted to the fixing foot, making it easier for the fixing foot to melt the earphone shell, and thus easier to connect with the earphone shell.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the spherical steel mesh structure; Figure 2 This is an overall schematic diagram of an ultrasonic welding head according to some embodiments of the first aspect of the present invention; Figure 3 for Figure 2 A bottom view of a medium ultrasonic welding head; Figure 4 for Figure 3 Schematic diagram of the cross section at point AA; Figure 5 for Figure 4 A schematic diagram of the interaction between the ultrasonic welding head and the spherical steel mesh; Figure 6 This is a schematic diagram of the welding method steps according to some embodiments of the second aspect of the present invention.

[0021] Figure label: 10. Spherical steel mesh, 11. Steel mesh body, 12. Convex surface, 13. Fixing feet; The ultrasonic welding head 100, the first welding part 110, the second welding part 120, the welding surface 130, the first mating surface 131, the second mating surface 132, the clearance groove 140, the connecting part 150, and the barrier part 160. Detailed Implementation

[0022] Embodiments of the present invention 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 the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0024] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0026] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] Please refer to Figure 1As shown, the spherical steel mesh 10 is an important component set on the earphone shell, including a steel mesh body 11 and multiple fixing feet 13. The multiple fixing feet 13 are connected to the steel mesh body 11 and located in the circumference of the steel mesh body 11.

[0028] The steel mesh body 11 has a convex surface 12 and multiple through holes. The through holes are distributed on the convex surface 12. The sound-generating unit located inside the earphone shell can emit sound to the outside of the earphone through the through holes provided on the steel mesh body 11. When the spherical steel mesh 10 is welded to the earphone shell using the ultrasonic welding head 100, the welding surface 130 of the ultrasonic welding head 100 is in contact with the convex surface 12, so that the ultrasonic welding head 100 applies ultrasonic waves to the steel mesh body 11 through the welding surface 130. The steel mesh body 11 transmits the ultrasonic vibration to the fixing foot 13. The fixing foot 13 and the earphone shell rub intensely and generate heat, thereby melting the part of the earphone shell in contact with the fixing foot 13, so that the fixing foot 13 can be embedded into the earphone shell, realizing the connection between the spherical steel mesh 10 and the earphone shell.

[0029] Through long-term practice, the inventors discovered that during welding, the energy of the existing ultrasonic welding head 100 is dispersed on the welding surface 130, resulting in lower ultrasonic energy transmitted to the fixing foot 13. As a result, the earphone shell is not easily melted, and the fixing foot 13 is difficult to enter the earphone shell during the welding process, leading to low connection strength between the spherical steel mesh and the earphone shell.

[0030] In view of this, please refer to Figures 2 to 5 As shown, the present invention proposes an ultrasonic welding head 100 for welding a spherical steel mesh 10. The spherical steel mesh 10 includes a steel mesh body 11 and a plurality of fixing feet 13. The steel mesh body 11 has a convex surface 12, and the plurality of fixing feet 13 are connected to the steel mesh body 11 and located in the circumference of the steel mesh body 11.

[0031] Please refer to Figure 2 As shown, the ultrasonic welding head 100 of the present invention includes a first welding portion 110 and a plurality of second welding portions 120. The plurality of second welding portions 120 are connected to the first welding portion 110 and located in the circumferential direction of the first welding portion 110. The ultrasonic welding head 100 also has a welding surface 130. The welding surface 130 includes a first contact surface 131 for contacting the convex surface 12 and a plurality of second contact surfaces 132. The first welding portion 110 has the first contact surface 131, and each second welding portion 120 has a second contact surface 132. The second contact surface 132 is in contact with the first contact surface 131. There is a gap between each pair of adjacent second welding portions 120, and a clearance groove 140 is defined.

[0032] Through the above scheme, the ultrasonic welding head 100 can transmit ultrasonic energy to the steel mesh body 11 through the first contact surface 131 and the second contact surface 132 for contacting the convex surface 12, and then transmit the ultrasonic energy to the fixing foot 13. Due to the impedance difference between the clearance groove 140 and the second welding part 120, the propagation of ultrasonic energy from the first contact surface 131 toward the clearance groove 140 is suppressed, and it will diffuse more toward the second contact surface 132. This is beneficial to make the ultrasonic energy of the second contact surface 132 higher, increasing the ultrasonic energy transmitted to the fixing foot 13, making it easier for the fixing foot 13 to melt the earphone shell, and thus easier to connect with the earphone shell.

[0033] Please refer to Figure 5 As shown, when those skilled in the art use the ultrasonic welding head 100 of the present invention, the first bonding surface 131 can be bonded to the central region of the convex surface 12, and the second bonding surface 132 can be bonded to the outer region of the convex surface 12. The end of the second welding part 120 away from the first welding part 110 can be brought close to the fixing foot 13. In this way, more ultrasonic energy can be transmitted to the fixing foot 13 through the second welding part 120, thereby increasing the ultrasonic energy of the fixing foot 13 and making it easier to weld the fixing foot 13 to the earphone shell.

[0034] It should be understood that the first mating surface 131 and the second mating surface 132 in this invention are used to mat with the convex surface 12 of the steel mesh body 11. Those skilled in the art can design a shape that can mat with the convex surface 12 of the steel mesh body 11 based on the shape of the convex surface 12. For example, please refer to... Figure 1 , Figure 2 , Figure 5 As shown, where Figure 5 for Figure 1 The spherical steel mesh 10 in the middle and Figure 2 The schematic diagram shows the ultrasonic welding head 100 in action. The convex surface 12, the first bonding surface 131, and the second bonding surface 132 of the steel mesh body 11 are all part of a spherical surface with the same radius of curvature.

[0035] Without departing from the inventive concept of this invention, those skilled in the art can also improve the structure of the ultrasonic welding head 100.

[0036] Please refer to Figure 2 , Figure 3 As shown, in some embodiments, the spacing between any two adjacent second mating surfaces 132 is the same. Through this scheme, during the application of ultrasonic waves by the ultrasonic welding head 100, the ultrasonic energy of the first mating surface 131 can be more evenly transmitted to different second mating surfaces 132, which helps to reduce the difference in ultrasonic energy transmitted from the second mating surface 132 to different fixing feet 13, thereby reducing the difference in welding effect between the different fixing feet 13 of the spherical steel mesh 10.

[0037] Please refer to Figure 3 As shown, in some embodiments, each clearance groove 140 extends in a direction away from the first welding portion 110. With this design, each clearance groove 140 extends in a single direction, resulting in a simpler inner wall shape, which simplifies the processing of the ultrasonic welding head 100 and reduces its manufacturing cost.

[0038] Further, please refer to Figure 2 As shown, in some embodiments, the ultrasonic welding head 100 further includes a connecting portion 150 connected to the side of each second welding portion 120 away from the first welding portion 110. The connecting portion 150 can further strengthen the portion of the second welding portion 120 away from the first welding portion 110, making it less prone to breakage due to high-frequency vibration, thereby improving the service life of the ultrasonic welding head 100.

[0039] Based on the above solution, those skilled in the art can make further adjustments to the connecting part 150.

[0040] In some embodiments, the connecting portion 150 protrudes relative to the second mating surface 132. With this design, the ultrasonic energy concentrated on the second mating surface 132, when transmitted in a direction away from the first mating surface 131, is blocked by the connecting portion 150 protruding relative to the second mating surface 132, thus confining it within the second mating surface 132. This facilitates the transmission of more ultrasonic energy through the second mating surface 132 to the steel mesh body 11, increasing the ultrasonic energy received by the fixing foot 13, making it easier to weld the fixing foot 13 to the earphone shell, and reducing damage to the earphone shell from the ultrasonic welding head 100.

[0041] Regarding the specific process of reducing damage to the earphone shell by the ultrasonic welding head 100 in the above embodiments, specifically, in the prior art, when welding the spherical steel mesh to the earphone shell, at least a portion of the spherical steel mesh is housed inside the earphone shell, and the connecting portion 150 of the ultrasonic welding head 100 easily comes into contact with the earphone shell during the welding process. However, since the connecting portion 150 of the above embodiments protrudes relative to the second contact surface 132, the ultrasonic energy of the second contact surface 132 is less likely to be transmitted to the connecting portion 150, the ultrasonic energy received by the earphone shell is lower, and it is less likely to be damaged by the ultrasonic vibration applied by the ultrasonic welding head 100.

[0042] In some embodiments, the impedance of the connecting portion 150 is greater than the impedance of the first welding portion 110. Through this solution, the ultrasonic energy concentrated on the second mating surface 132, when transmitted in a direction away from the first mating surface 131, is blocked by the high-impedance connecting portion 150 and thus confined within the second mating surface 132. This facilitates the transmission of more ultrasonic energy through the second mating surface 132 to the steel mesh body 11, increasing the ultrasonic energy received by the fixing foot 13, making it easier to weld the fixing foot 13 to the earphone shell, and reducing damage to the earphone shell from the ultrasonic welding head 100.

[0043] As a preferred embodiment, the first bonding surface 131 and the second bonding surface 132 are located on one side of the ultrasonic welding head 100 in the first direction. The ultrasonic welding head 100 also includes a blocking portion 160, which is connected to the connecting portion 150 and located on one side of the blocking portion 160 in the first direction. The impedance of the blocking portion 160 is greater than the impedance of the first welding portion 110. With the above arrangement, when the ultrasonic energy concentrated on the second bonding surface 132 is transmitted in a direction away from the first bonding surface 131, it will be blocked by the high-impedance blocking portion 160, which protrudes relative to the connecting portion 150, and thus confined within the second bonding surface 132. This facilitates the transmission of more ultrasonic energy to the steel mesh body 11 through the second bonding surface 132, reducing damage to the earphone shell caused by the ultrasonic welding head 100.

[0044] Furthermore, in some embodiments, the impedance of the first welding portion 110 is greater than the impedance of the second welding portion 120. Through this scheme, the ultrasonic energy applied by the second welding portion 120 is less likely to be transmitted from the second mating surface 132 to the first mating surface 131, and the ultrasonic energy applied by the ultrasonic welding head 100 is also more easily transmitted to the second welding portion 120. This allows the second welding surface 130 to concentrate more ultrasonic energy, making it easier to weld the fixing foot 13 to the earphone shell. On the other hand, since the first mating surface 131 is used to mat with the convex surface 12, and the impedance of the first welding portion 110 is higher than the impedance of the second welding portion 120, the ultrasonic energy received by the first welding portion 110 is lower than the ultrasonic energy received by the second welding portion 120. Therefore, the first welding portion 110 applies less ultrasonic energy to the steel mesh body 11 through the first mating surface 131, reducing damage to the steel mesh body 11.

[0045] For details on the specific process of reducing damage to the steel mesh body 11 in the above embodiments, please refer to [link / reference needed]. Figure 5As shown, the spherical steel mesh 10 is welded to the earphone shell via fixing feet 13. The first contact surface 131 is attached to the center of the convex surface 12, that is, to the position of the convex surface 12 away from the fixing feet 13. The second contact surface 132 is attached to the outer area of ​​the convex surface 12, that is, to the position of the convex surface 12 near the fixing feet 13. When the ultrasonic welding head 100 applies ultrasonic waves, compared to applying ultrasonic waves to the steel mesh body 11 through the second contact surface 132, applying ultrasonic waves to the steel mesh body 11 through the first contact surface 131 will cause the steel mesh body 11 to vibrate more significantly, making the steel mesh body 11 more susceptible to damage. Since the impedance of the first welding part 110 in the above embodiment is higher than the impedance of the second welding part 120, the ultrasonic energy applied by the ultrasonic welding head 100 to the steel mesh body 11 through the first contact surface 131 is lower. Applying ultrasonic waves through the first contact surface 131 results in a lower vibration amplitude in the steel mesh body 11, making the steel mesh body 11 less prone to damage.

[0046] Based on the above solutions, those skilled in the art can use a low-resistance material to fabricate the second weld portion 120, and a high-resistance material to fabricate the first weld portion 110, the connecting portion 150, and the barrier portion 160. In some embodiments, the second weld portion 120 is made of TC4 titanium alloy, and the first weld portion 110, the connecting portion 150, and the barrier portion 160 are all made of tungsten-copper alloy. In some embodiments, the surface roughness of the first weld portion 110, the connecting portion 150, and the barrier portion 160 are all greater than the surface roughness of the second weld portion 120. All of the above solutions enable the impedance of the first weld portion 110, the connecting portion 150, and the barrier portion 160 to be greater than the impedance of the second weld portion 120.

[0047] The present invention also proposes a welding apparatus for welding a spherical steel mesh 10 to an earphone housing, comprising a fixing base and an ultrasonic welding head 100 as described in any of the above embodiments. The fixing base of the present invention is used to fix the spherical steel mesh 10 and the earphone housing, the welding surface 130 of the ultrasonic welding head 100 faces the fixing base, and the ultrasonic welding head 100 is movable toward the fixing base.

[0048] With the above scheme, after the spherical steel mesh 10 and the earphone shell are fixed by the fixing seat of the welding device, the ultrasonic welding head 100 can move toward the fixing seat and contact the spherical steel mesh 10, so that the first contact surface 131 and the second contact surface 132 are attached to the convex surface 12. Ultrasonic energy is transmitted to the steel mesh body 11 through the first contact surface 131 and the second contact surface 132 for contact with the convex surface 12, and then the ultrasonic energy is transmitted to the fixing foot 13. Since there is an impedance difference between the clearance groove 140 and the second welding part 120, the propagation of ultrasonic energy from the first contact surface 131 toward the clearance groove 140 is suppressed, and more of it will diffuse toward the second contact surface 132. This is beneficial to make the ultrasonic energy of the second contact surface 132 higher, increasing the ultrasonic energy transmitted to the fixing foot 13, making it easier for the fixing foot 13 to melt the earphone shell, and thus easier to connect with the earphone shell.

[0049] In some embodiments, the welding apparatus further includes a transducer, and the ultrasonic welding head 100 is connected to the transducer. The transducer can convert high-frequency electrical signals into mechanical vibrations, thereby driving the ultrasonic welding head 100 to vibrate.

[0050] In some embodiments, the welding apparatus further includes an amplitude transformer. The ultrasonic welding head 100 is connected to the transducer via the amplitude transformer. The high-frequency mechanical vibration output by the transducer can change the vibration amplitude through the transducer, thereby adjusting the vibration amplitude of the ultrasonic welding head 100 and changing the welding effect of the ultrasonic welding head 100.

[0051] Please refer to Figure 6 As shown, the present invention also proposes a welding method for welding the spherical steel mesh 10 using the welding device as described in any of the above embodiments, the specific steps of which are as follows: S101. Fix the spherical steel mesh 10 and the earphone shell to the mounting base.

[0052] S102. Bring the ultrasonic welding head 100 close to the fixed base so that the first contact surface 131 and the second contact surface 132 are in contact with the convex surface 12, and the end of each second welding part 120 away from the first welding part 110 points to at least one fixed foot 13.

[0053] S103. Apply ultrasonic waves from the ultrasonic welding head 100 to the steel mesh body 11 so that the fixing foot 13 is welded to the earphone shell.

[0054] With the above scheme, after the spherical steel mesh 10 and the earphone shell are fixed by the fixing seat of the welding device, the ultrasonic welding head 100 can move toward the fixing seat and contact the spherical steel mesh 10, so that the first contact surface 131 and the second contact surface 132 are attached to the convex surface 12. Ultrasonic energy is transmitted to the steel mesh body 11 through the first contact surface 131 and the second contact surface 132 for contact with the convex surface 12, and then the ultrasonic energy is transmitted to the fixing foot 13. Since there is an impedance difference between the clearance groove 140 and the second welding part 120, the propagation of ultrasonic energy from the first contact surface 131 toward the clearance groove 140 is suppressed, and more of it will diffuse toward the second contact surface 132. This is beneficial to make the ultrasonic energy of the second contact surface 132 higher, increasing the ultrasonic energy transmitted to the fixing foot 13, making it easier for the fixing foot 13 to melt the earphone shell, and thus easier to connect with the earphone shell.

[0055] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. An ultrasonic welding head for welding spherical steel mesh, the spherical steel mesh comprising a steel mesh body and a plurality of fixed feet, the steel mesh body having a convex surface, the plurality of fixed feet being connected to the steel mesh body and located circumferentially on the steel mesh body, characterized in that, The ultrasonic welding head includes a first welding part and a plurality of second welding parts. The plurality of second welding parts are connected to the first welding part and located circumferentially to the first welding part. The ultrasonic welding head also has a welding surface, which includes a first contact surface for conforming to the convex surface and a plurality of second contact surfaces. The first welding part has the first contact surface, and each second welding part has a second contact surface. The second contact surface is in contact with the first contact surface. There is a gap between each pair of adjacent second welding parts, and a clearance groove is defined.

2. The ultrasonic welding head according to claim 1, characterized in that, The ultrasonic welding head also has a connecting portion, which is connected to the side of each second welding portion away from the first welding portion.

3. The ultrasonic welding head according to claim 2, characterized in that, The connecting portion protrudes relative to the second mating surface.

4. The ultrasonic welding head according to claim 2, characterized in that, The impedance of the connection part is greater than the impedance of the first welded part.

5. The ultrasonic welding head according to claim 2, characterized in that, The first bonding surface and the second bonding surface are located on one side of the ultrasonic welding head in the first direction; The ultrasonic welding head further includes a blocking part, which is connected to the connecting part and located on one side of the blocking part in the first direction. The impedance of the blocking part is greater than the impedance of the first welding part.

6. The ultrasonic welding head according to claim 4 or 5, characterized in that, The impedance of the first welded part is greater than the impedance of the second welded part.

7. The ultrasonic welding head according to claim 1, characterized in that, Each of the aforementioned clearance grooves extends in a direction away from the first welded portion.

8. The ultrasonic welding head according to claim 1, characterized in that, The spacing between any two adjacent second mating surfaces is the same.

9. A welding apparatus for welding the spherical steel mesh to an earphone housing, characterized in that, include: A mounting base is used to secure the spherical steel mesh and the earphone housing. The ultrasonic welding head as described in any one of claims 1 to 8, wherein the welding surface faces the fixed base, and the ultrasonic welding head is movable toward the fixed base.

10. A welding method, characterized in that, The spherical steel mesh is welded using the welding apparatus as described in claim 9, and the specific steps are as follows: The spherical steel mesh and the earphone shell are fixed to the fixing base; Bring the ultrasonic welding head close to the fixed base so that the first contact surface and the second contact surface are in contact with the convex surface, and the end of each second welding part away from the first welding part points to at least one of the fixed feet; The ultrasonic welding head applies ultrasonic waves to the steel mesh body to weld the fixing feet to the earphone housing.

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