Multi-point detection adaptive microphone ultrasonic welding mold

Abstract

The utility model belongs to ultrasonic welding technical field, specifically disclose a kind of multi-point detection adaptation type microphone ultrasonic welding mould, including upper die, lower die, pressing unit, telescopic mechanism and MCU, wherein the recess for accommodating workpiece is equipped on the lower die, the upper die is set at the top of the lower die, the output of the pressing unit is connected with the upper die, the pressing unit is used to drive the upper die lifting movement and act on workpiece, the telescopic mechanism is multiple, and interval distribution is at the bottom of the recess, the bottom of multiple telescopic mechanism is evenly provided with pressure sensing module. The design scheme can dynamically balance the offset pressure during welding, ensure that the abutting interface of upper shell and lower shell is uniformly stressed, so as to improve the transmission efficiency of vibration energy and melting consistency, avoid welding misplacement or local stress concentration problem.

Description

Technical Field

[0001] This utility model belongs to the field of ultrasonic welding technology, specifically a multi-point detection adapter microphone ultrasonic welding mold. Background Technology

[0002] Ultrasonic welding, due to its high efficiency and cleanliness, has become one of the mainstream processes in the field of plastic shell welding and molding. This technology uses high-frequency vibration to generate heat through molecular friction at the contact interface, achieving localized melting and bonding of thermoplastic materials. It is particularly suitable for applications requiring high sealing and aesthetic consistency, such as automotive parts and consumer electronics (e.g., microphone) housings. Compared to traditional adhesive or bolt connections, ultrasonic welding requires no additional materials and can complete high-strength welds within seconds, significantly improving production efficiency and cost advantages.

[0003] like Figure 6 As shown, traditional ultrasonic welding molds include an upper mold and a lower mold. After the upper mold presses and fixes the main body of the workpiece, the vibrators on both sides move to the edge of the workpiece, welding the adhesive between the upper and lower shells along with the edges of the upper and lower shells using high-frequency vibration. However, in practical applications, the applicant has found that even for upper and lower shells from the same batch, there are always undesirable factors such as dimensional tolerances, adhesive thickness, and slight deformation on the welding surface. This results in different degrees of tightness between the upper and lower shells, causing the pressing force applied by the upper mold during welding to deviate in direction. On the one hand, the deviated pressing force can easily cause relative displacement between the upper and lower shells, causing the welding position to deviate from the preset trajectory and affecting assembly accuracy. On the other hand, the energy transfer efficiency of different areas along the abutment edge varies due to uneven stress, resulting in inconsistent melting states at the welding interface. This phenomenon not only reduces the structural strength and sealing of the welding interface but may also cause shell cracking due to local stress concentration, directly affecting the reliability and yield of the product. Utility Model Content

[0004] To overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a multi-point detection adapter microphone ultrasonic welding mold.

[0005] The technical solution adopted in this utility model is as follows: A multi-point detection adaptable microphone ultrasonic welding mold includes an upper mold, a lower mold, a pressing unit, a telescopic mechanism, and an MCU. The lower mold is provided with a groove for accommodating the workpiece. The upper mold is located directly above the lower mold. The output end of the pressing unit is connected to the upper mold. The pressing unit is used to drive the upper mold to move up and down and act on the workpiece. There are multiple telescopic mechanisms, which are distributed at intervals at the bottom of the groove. Each of the multiple telescopic mechanisms is provided with a pressure sensing module at its bottom. When the upper mold moves downward and presses against the workpiece, the multiple telescopic mechanisms adjust their height in real time according to the pressure parameters obtained by the pressure sensing module to balance the pressing force on the workpiece from the upper mold.

[0006] In a preferred embodiment, the bottom of the groove is provided with a plurality of receiving cavities along the circumferential direction, and the plurality of telescopic mechanisms and the pressure sensing module are respectively arranged in the receiving cavities.

[0007] In a preferred embodiment, the telescopic mechanism includes a push rod motor and an abutting ball, wherein the output end of the push rod motor is arranged upward and can extend out of the receiving cavity.

[0008] In a preferred embodiment, the abutting ball is rotatably connected to the top of the output end of the push rod motor, and the bottom of the workpiece is rotatably abutted against the output end of the push rod motor via the abutting ball.

[0009] In a preferred embodiment, both the push rod motor and the pressure sensing module are electrically connected to the MCU. The pressure sensing module is used to collect pressure parameters and convert them into recognizable signals, which are then sent to the MCU. The MCU sends corresponding control commands to the push rod motor based on the recognized signals, and the push rod motor performs corresponding height adjustment operations according to the control commands.

[0010] In a preferred embodiment, the pressure sensing module is disposed at the bottom of the push rod motor and is coaxially arranged with the push rod motor.

[0011] In a preferred embodiment, the pressure sensing module is a strain gauge pressure sensor.

[0012] In a preferred embodiment, the plurality of receiving cavities are all disposed at the bottom outer edge of the groove.

[0013] In a preferred embodiment, there are at least four telescopic mechanisms, which are arranged at equal intervals.

[0014] In a preferred embodiment, the pressing unit is a pneumatic cylinder, an electric push rod, or a hydraulic cylinder.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] This invention incorporates multiple telescopic mechanisms and pressure sensors within the groove of the lower mold. The telescopic mechanisms can adjust in real time according to the pressure parameters of the pressure sensors, balancing the pressing force from the upper mold on the upper and lower shells of the workpiece. This prevents welding misalignment or localized stress concentration, thereby improving the efficiency of vibration energy transmission and the consistency of melting. Furthermore, the adaptive adjustment mechanism of the multiple telescopic mechanisms significantly reduces the dependence on workpiece machining accuracy, ensuring both the structural strength and sealing of the welding interface, and improving the compatibility of the fixture with different batches of workpieces and the production yield. Attached Figure Description

[0017] Figure 1 This is a simplified structural diagram of an embodiment of the present utility model;

[0018] Figure 2 This is a simplified structural diagram of the telescopic mechanism before height adjustment in an embodiment of this utility model;

[0019] Figure 3 This is a simplified structural diagram of the telescopic mechanism adjusting its height in an embodiment of this utility model;

[0020] Figure 4 for Figure 3 Enlarged planar structural schematic diagram;

[0021] Figure 5 This is a schematic diagram of an embodiment of the present utility model;

[0022] Figure 6 This is a simplified schematic diagram of the use of ultrasonic welding fixtures in the prior art.

[0023] Marked in the image:

[0024] 100 - lower mold, 110 - receiving cavity, 120 - groove;

[0025] 200-oscillator;

[0026] 300-Down-pressure unit;

[0027] 400-upper mold;

[0028] 500 - Telescopic mechanism, 510 - Push rod motor, 520 - Abutting ball;

[0029] 600 - Workpiece;

[0030] 700 - Pressure Sensing Module;

[0031] 800-MCU. Detailed Implementation

[0032] 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.

[0033] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 limitations on this utility model.

[0034] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0035] A multi-point detection adapter type ultrasonic welding mold for microphones, referring to Figure 1-6 The system includes an upper mold 400, a lower mold 100, a pressing unit 300, a telescopic mechanism 500, and an MCU (microcontroller) 800. The lower mold 100 has a groove 120 for accommodating a workpiece 600. The upper mold 400 is positioned directly above the lower mold 100. The output of the pressing unit 300 is connected to the upper mold 400, and the pressing unit 300 drives the upper mold 400 to move up and down and act on the workpiece 600. Multiple telescopic mechanisms 500 are spaced apart at the bottom of the groove 120. Each telescopic mechanism 500 has a pressure sensing module 700 at its bottom. When the upper mold 400 moves downward and presses against the workpiece 600, the multiple telescopic mechanisms 500 adjust the pressure parameters obtained by the pressure sensing modules 700 in real time. The height is adjustable to balance the pressing force from the upper mold 400 on the workpiece 600. Multiple telescopic mechanisms 500 and pressure sensing modules 700 are designed in the groove 120 of the lower mold 100. The telescopic mechanisms 500 can adjust in real time according to the pressure parameters of the pressure sensing modules 700, which can balance the pressing force from the upper mold 400 on the upper and lower shells of the workpiece 600, avoid welding misalignment or local stress concentration, thereby improving the transmission efficiency of vibration energy and the consistency of melting. At the same time, the adaptive adjustment mechanism of multiple telescopic mechanisms 500 significantly reduces the dependence on the machining accuracy of the workpiece 600, which not only ensures the structural strength and sealing of the welding interface, but also improves the compatibility of the fixture with different batches of workpieces 600 and the production yield.

[0036] Specifically, the pressing unit 300 is a cylinder, an electric push rod, or a hydraulic cylinder. In this embodiment, the pressing unit 300 is a cylinder.

[0037] The specific operation process is as follows: The telescopic mechanism 500 generates initial pressure parameters for the pressure sensor 700. After the upper shell of the workpiece is placed on the lower shell, the pressure sensing module 700 captures the increased pressure parameters. During the process of the upper mold 400 abutting and pressing against the upper shell, if there is a dimensional difference between the shape of the upper shell and the upper mold 400, the higher end of the upper shell will be pressed against the upper mold 400 first. The pressure sensing module 700 at the corresponding position (nearby) will obtain the highest change amplitude. After the MCU 800 learns of this change amplitude, it drives the telescopic mechanism 500 at the corresponding position to move the height in real time. The adjustment lowers the height of the portion of the lower shell closest to the corresponding pressure sensing module 700, allowing the corresponding portion of the lower shell to move synchronously with the upper mold 400, thus buffering the pressing force. At this time, the height of the remaining portion of the lower shell remains unchanged, and the remaining portion of the lower shell will be subjected to the pressure of the upper mold 400 in sequence (in height order). The corresponding telescopic mechanism 500 is adjusted in sequence, thereby making the real-time monitoring pressure of all pressure sensing modules 700 tend to be the same, achieving a balance of pressing force. Then, the subsequent welding operation can be performed through the vibrator 200 (the welding operation is an existing and well-known technology, and will not be described in detail here).

[0038] In this embodiment, the bottom of the groove 120 is provided with multiple receiving cavities 110 along the circumferential direction. Multiple telescopic mechanisms 500 and pressure sensing modules 700 are respectively arranged in the receiving cavities 110. There are at least four telescopic mechanisms 500, which are arranged at equal intervals. By using multiple telescopic mechanisms 500 arranged at equal intervals along the circumferential direction, the pressure force offset during the overall welding process of the workpiece 600 can be dynamically balanced, ensuring that the contact interface between the upper shell and the lower shell is uniformly stressed. Of course, in other embodiments, there may be five, six, etc., telescopic mechanisms 500, which is not specifically limited here.

[0039] Specifically, multiple receiving cavities 110 are all located at the bottom outer edge of the groove 120. With this design, when the workpiece 600 is assembled in the groove 120, the telescopic mechanism 500 can abut against the edge of the workpiece 600. In the subsequent pressing process, the pressure sensing module 700 can collect pressure values ​​more accurately, thereby improving the accuracy of subsequent universal adjustment.

[0040] In this embodiment, refer to Figure 4 and Figure 5As shown, the telescopic mechanism 500 includes a push rod motor 510 and an abutting ball 520. The output end of the push rod motor 510 is arranged upward and can extend out of the receiving cavity 110. Both the push rod motor 510 and the pressure sensing module 700 are electrically connected to the MCU 800. The pressure sensing module 700 is used to collect pressure parameters and convert them into recognizable signals to be sent to the MCU 800. The MCU 800 sends corresponding control commands to the push rod motor 510 according to the recognized signals. The push rod motor 510 performs the corresponding height adjustment operation according to the control commands. Through the linkage of the MCU 800, the push rod motor 510 and the pressure sensing module 700, the telescopic length of the telescopic mechanism 500 can be adjusted according to the pressure value detected by the pressure sensing module 700. It can be adaptively adjusted according to different workpiece size tolerances, which improves the compatibility of the fixture with different batches of products and the production yield.

[0041] In this embodiment, refer to Figure 4 As shown, the abutting ball 520 is rotatably connected to the top of the output end of the push rod motor 510. The bottom of the workpiece 600 is rotatably abutted against the output end of the push rod motor 510 through the abutting ball 520. Through the linkage between the push rod motor 510 and the abutting ball 520, the position of the workpiece 600 can be adjusted in all directions to adapt to the angle adjustment requirements corresponding to various height differences.

[0042] In this embodiment, refer to Figure 4 As shown, the pressure sensing module 700 is located at the bottom of the push rod motor 510 and is coaxial with the push rod motor 510. This design can ensure the consistency of the pressure values ​​of each pressure sensing module 700 at the initial stage, and also ensure the accuracy of the pressure collected by the subsequent pressure sensing module 700 during pressing.

[0043] In this embodiment, the pressure sensing module 700 is a strain gauge pressure sensor. Strain gauge pressure sensors have high sensitivity and can detect minute strain changes. This high sensitivity not only improves the measurement accuracy but also enables the sensor to respond quickly. Moreover, the structure of strain gauge pressure sensors is relatively simple, which not only facilitates manufacturing and maintenance but also makes them more convenient to install and use.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-point detection adapter-type ultrasonic welding mold for microphones, characterized in that, The device includes an upper mold, a lower mold, a pressing unit, a telescopic mechanism, and an MCU. The lower mold has a groove for accommodating the workpiece. The upper mold is positioned directly above the lower mold. The output end of the pressing unit is connected to the upper mold. The pressing unit drives the upper mold to move up and down and act on the workpiece. There are multiple telescopic mechanisms, which are spaced apart at the bottom of the groove. Each telescopic mechanism has a pressure sensing module at its bottom. When the upper mold moves downward and presses against the workpiece, the multiple telescopic mechanisms adjust their height in real time according to the pressure parameters obtained by the pressure sensing modules to balance the pressing force on the workpiece from the upper mold.

2. The multi-point detection adapter-type ultrasonic welding mold for microphones as described in claim 1, characterized in that: The bottom of the groove has multiple accommodating cavities arranged circumferentially, and multiple telescopic mechanisms and pressure sensing modules are arranged one-to-one in the accommodating cavities.

3. The multi-point detection adapter-type ultrasonic welding mold for microphones as described in claim 2, characterized in that: The telescopic mechanism includes a push rod motor and abutting balls. The output end of the push rod motor is arranged facing upward and can extend out of the receiving cavity.

4. The multi-point detection adapter-type ultrasonic welding mold for microphones as described in claim 3, characterized in that: The abutting ball is rotatably connected to the top of the output end of the push rod motor, and the bottom of the workpiece is rotatably abutted against the output end of the push rod motor through the abutting ball.

5. The multi-point detection adapter-type ultrasonic welding mold for microphones as described in claim 4, characterized in that: Both the push rod motor and the pressure sensing module are electrically connected to the MCU. The pressure sensing module is used to collect pressure parameters and convert them into recognizable signals, which are then sent to the MCU. The MCU sends corresponding control commands to the push rod motor based on the recognized signals, and the push rod motor performs corresponding height adjustment operations according to the control commands.

6. The multi-point detection adapter-type ultrasonic welding mold for microphones as described in claim 5, characterized in that: The pressure sensing module is located at the bottom of the push rod motor and is coaxial with the push rod motor.

7. The multi-point detection adapter-type ultrasonic welding mold for microphones as described in claim 6, characterized in that: The pressure sensing module is a strain gauge pressure sensor.

8. The multi-point detection adapter-type ultrasonic welding mold for microphones as described in claim 2, characterized in that: The plurality of the receiving cavities are all located at the bottom outer edge of the groove.

9. The multi-point detection adapter-type ultrasonic welding mold for microphones as described in claim 2, characterized in that: The telescopic mechanism comprises at least four parts, which are arranged at equal intervals.

10. The ultrasonic welding mold for a multi-point detection adapter microphone as described in claim 9, characterized in that: The pressing unit is a pneumatic cylinder, an electric push rod, or a hydraulic cylinder.

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