Acoustic composite membrane for loudspeakers and processing tool thereof

Abstract

The present application relates to the technical field of acoustic composite film processing equipment, in particular to a kind of acoustic composite film for loudspeaker and its processing tooling: including workbench, bearing platform, support, drive component, upper die plate, lower die plate and jacking mechanism, jacking mechanism includes two mounting brackets, two lifting units and two jacking plates, after the completion of pressing process, lifting unit drives jacking plate to be lifted upwards from the groove in the bottom of cavity, two sides jacking plate is guided by the synchronous lifting of sliding block and sliding groove, simultaneously apply jacking force from the two side edges of composite film, make composite film uniform stress and smoothly separate from cavity bottom surface, replace the mode of traditional manual with tool from one side pry.The process avoids the damage of membrane edge and interlayer separation caused by excessive local stress or improper prying angle, and the jacking operation is automatically completed by lifting unit without manual intervention, which significantly improves the demolding efficiency and product yield.

Description

Technical Field

[0001] This invention relates to the field of acoustic composite diaphragm processing equipment, and in particular to an acoustic composite diaphragm for loudspeakers and its processing tooling. Background Technology

[0002] Acoustic composite diaphragms for loudspeakers are the core vibrating components in electroacoustic transducers, and their performance directly affects the frequency response characteristics, distortion, and overall sound quality of the loudspeaker. Acoustic composite diaphragms are typically made of multiple layers of heterogeneous materials. Through the synergistic cooperation of rigid and damping layers, they effectively control different vibration modes within the loudspeaker's operating frequency band, thereby achieving a flat frequency response and low harmonic distortion.

[0003] Currently, the processing fixtures for acoustic composite diaphragms used in loudspeakers have seen some development in the industry. Existing processing fixtures typically include a support platform and a pressing mechanism. The support platform supports the stacked multi-layer diaphragm materials, while the pressing mechanism includes an upper and lower template positioned opposite each other. The lower template is fixed to the support platform, and the upper template is driven by a drive device to move up and down. During processing, the operator stacks the rigid and damping diaphragms in a predetermined order on the cavity surface of the lower template. The drive device is then activated to lower the upper template, pressing the multi-layer diaphragms together under heating conditions to form the finished composite diaphragm.

[0004] However, in actual use, existing acoustic composite diaphragm processing fixtures for loudspeakers cause the composite diaphragm to adhere to the lower template cavity surface after pressing, making it difficult to remove. Tools are needed to pry it up, which can easily cause damage to the diaphragm edges and separation between layers, affecting product quality and production efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide an acoustic composite diaphragm for loudspeakers and its processing fixture, which solves the problem that in the actual use of existing acoustic composite diaphragm processing fixtures for loudspeakers, the composite diaphragm adheres to the cavity surface of the lower template after pressing and is difficult to remove, requiring the use of tools to pry it up, which easily causes damage to the edge of the diaphragm and separation between layers, affecting product quality and production efficiency.

[0006] To achieve the above objectives, the present invention provides a processing fixture for an acoustic composite diaphragm for a loudspeaker. The processing fixture includes a worktable, a support platform, a bracket, a driving component, an upper template, a lower template, and a lifting mechanism. The support platform is disposed on the upper surface of the worktable, and the lower template is disposed above the support platform. A cavity is disposed at the top of the lower template. The bracket is mounted above the worktable, and the driving component is disposed at the top of the bracket. The upper template is disposed at the output end of the driving component, and the upper template corresponds to the cavity. The lifting mechanism includes two mounting brackets, two lifting units, and two lifting plates. Grooves are provided on both sides of the bottom of the cavity, and the lifting plates are disposed inside the grooves. Slide grooves are provided on both sides of the cavity. A sliding block is provided on the side of each lifting plate closest to the corresponding slide groove, and each sliding block penetrates the corresponding slide groove. The two mounting brackets are fixedly mounted on the upper surface of the workbench and are located on both sides of the support platform. Each mounting bracket is equipped with a lifting unit, and the output end of each lifting unit is connected to one of the sliding blocks.

[0007] Each of the lifting units includes a drive assembly, a limiting shaft, a threaded rod, and a connecting plate. The limiting shaft is rotatably mounted on the top of the mounting frame. The threaded rod is internally threaded to the limiting shaft. The connecting plate is mounted on the bottom of the threaded rod via a connecting bearing. The connecting plate is fixedly connected to the corresponding sliding block. The drive assembly is mounted on the top of the mounting frame, and the output end of the drive assembly is mechanically driven by the limiting shaft.

[0008] Each of the connecting plates has a limit rod fixedly installed on its upper surface, and the top end of each limit rod passes through the top end of the corresponding mounting bracket.

[0009] Each of the drive components includes a servo motor, a gear reducer, and an output gear. Each of the limit shafts has a transmission gear on its exterior. The servo motor is mounted on the top of the mounting bracket. The output end of the servo motor is equipped with the gear reducer, and the output end of the gear reducer is equipped with the output gear, which meshes with the transmission gear.

[0010] Each of the limiting pivots is provided with two limiting rings on its exterior, and the two limiting rings are respectively located on the upper and lower sides of the top of the mounting frame.

[0011] Each of the limiting rings has an annular groove on the side near the top of the corresponding mounting bracket, and a ball bearing unit is provided inside the annular groove, which makes rolling contact with the top of the corresponding mounting bracket.

[0012] The acoustic composite diaphragm processing fixture for loudspeakers also includes two protective shells. Each mounting bracket has a protective shell at its top, and the protective shells are disposed outside the corresponding output gear and transmission gear.

[0013] Each of the protective shells is connected to an injection tube, and a sealing plug is provided at the end of each injection tube away from the corresponding protective shell.

[0014] The present invention also provides a tooling for processing acoustic composite films for loudspeakers, which is prepared using the tooling described above. The acoustic composite film for loudspeakers includes a rigid layer and at least one damping layer. The rigid layer and the damping layer are pressed together under heating and pressure conditions. The rigid layer is selected from one of polyetherimide film, polyethylene naphthalate film, or polycarbonate film. The damping layer is selected from one of thermoplastic polyurethane film or acrylate-based damping film.

[0015] This invention discloses an acoustic composite diaphragm for loudspeakers and its processing fixture, comprising a worktable, a support platform, a bracket, a drive component, an upper template, a lower template, and a lifting mechanism. The lifting mechanism includes two mounting brackets, two lifting units, and two lifting plates. After the pressing process is completed, the lifting units drive the lifting plates to lift upwards from the groove at the bottom of the cavity. The lifting plates on both sides move up and down synchronously through the guide cooperation of the sliding blocks and the sliding grooves, applying lifting force simultaneously from both edges of the composite diaphragm. This ensures that the composite diaphragm is evenly stressed and smoothly detaches from the bottom surface of the cavity, replacing the traditional method of manually prying it off from one side with tools. This process avoids edge damage and interlayer separation of the diaphragm caused by excessive local stress or improper prying angle. Furthermore, the lifting operation is automated by the lifting units, requiring no manual intervention, significantly improving demolding efficiency and product yield. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the acoustic composite diaphragm processing fixture for loudspeakers according to the first embodiment of the present invention.

[0018] Figure 2 This invention provides Figure 1 A magnified view of the local structure at point A.

[0019] Figure 3 This is a schematic diagram of the disassembled structure of the lifting plate and the lower template in the first embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the limiting rotating shaft in the first embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the structure of the acoustic composite diaphragm processing fixture for loudspeakers according to the second embodiment of the present invention.

[0022] Figure 6 This invention provides Figure 5 A magnified view of the local structure at point B.

[0023] Figure 7 This is a schematic diagram of the structure of the acoustic composite diaphragm for loudspeakers provided by the present invention.

[0024] 101-Workbench, 102-Bearing Platform, 103-Bracket, 104-Drive Component, 105-Upper Template, 106-Lower Template, 107-Mounting Frame, 108-Lifting Plate, 109-Limiting Shaft, 110-Threaded Rod, 111-Connecting Plate, 112-Servo Motor, 113-Gear Reducer, 114-Output Gear, 115-Cavity, 116-Groove, 117-Slide Groove, 118-Sliding Block, 119-Connecting Bearing, 120-Limiting Rod, 121-Transmission Gear, 122-Limiting Ring, 123-Annular Groove, 124-Ball Unit, 201-Protective Shell, 202-Injection Pipe, 203-Sealing Plug, 301-Rigid Layer, 302-Damping Layer. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below, examples of which are illustrated 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 intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] First embodiment: Please see Figures 1 to 4 ,in Figure 1 This is a schematic diagram of the structural design of the acoustic composite diaphragm fabrication fixture for loudspeakers according to the first embodiment. Figure 2 yes Figure 1 A magnified view of the local structure at point A. Figure 3 This is a schematic diagram of the disassembled structure of the lifting plate and the lower template in the first embodiment. Figure 4 This is a schematic diagram of the limiting rotating shaft in the first embodiment.

[0027] This invention provides a tooling for processing acoustic composite diaphragms for loudspeakers, comprising a worktable 101, a support platform 102, a bracket 103, a drive component 104, an upper template 105, a lower template 106, and a lifting mechanism. The lifting mechanism includes two mounting brackets 107, two lifting units, and two lifting plates 108. Each lifting unit includes a drive assembly, a limiting shaft 109, a threaded rod 110, and a connecting plate 111. Each drive assembly includes a servo motor 112, a gear reducer 113, and an output gear 114. This solution addresses the problem in existing acoustic composite diaphragm processing tooling where, after pressing, the composite diaphragm adheres to the cavity 115 of the lower template 106, making it difficult to remove and requiring prying with tools. This can easily cause edge damage and interlayer separation, affecting product quality and production efficiency. It is understood that the aforementioned solution can be applied to the structure of a tooling for processing acoustic composite diaphragms for loudspeakers.

[0028] In this specific embodiment, the upper surface of the workbench 101 is provided with the bearing platform 102, the lower template 106 is provided above the bearing platform 102, the top end of the lower template 106 is provided with a cavity 115, the bracket 103 is installed above the workbench 101, the top end of the bracket 103 is provided with the driving component 104, the output end of the driving component 104 is provided with the upper template 105, and the upper template 105 corresponds to the cavity 115.

[0029] In this embodiment, the contour of the cavity 115 matches the shape of the acoustic composite diaphragm for the loudspeaker to be processed, and the lower surface shape of the upper template 105 matches the cavity 115. When the driving component 104 drives the upper template 105 downward, the upper template 105 is embedded in the cavity 115, pressing the multilayer diaphragm material stacked in the cavity 115 into a single unit under heating and pressure. During the pressing process, the multilayer diaphragm is formed into a composite diaphragm sheet with a predetermined contour under the constraint of the cavity 115.

[0030] The cavity 115 has grooves 116 on both sides of its inner bottom. The lifting plate 108 is installed inside the grooves 116. The cavity 115 has sliding grooves 117 on both sides. Each lifting plate 108 has a sliding block 118 on the side near the corresponding sliding groove 117. Each sliding block 118 passes through the corresponding sliding groove 117. Two mounting brackets 107 are fixedly installed on the upper surface of the workbench 101 and are located on both sides of the bearing platform 102. Each mounting bracket 107 is equipped with a lifting unit. The output end of each lifting unit is connected to one of the sliding blocks 118.

[0031] In this embodiment, the depth of the groove 116 is equal to the thickness of the lifting plate 108, so that the upper surface of the lifting plate 108 is flush with the inner bottom surface of the cavity 115 when it is not ejected, ensuring that the bottom surface of the composite film sheet is flat during the pressing process. The slide 117 extends vertically, and one end of the sliding block 118 is fixedly connected to the side wall of the lifting plate 108, while the other end extends outward through the slide 117 and connects to the output end of the lifting unit. When the lifting unit is activated, the sliding block 118 drives the lifting plate 108 to move vertically up and down along the slide 117, ensuring that the lifting plate 108 can move freely up and down within the groove 116 without interference.

[0032] Secondly, the limiting shaft 109 is rotatably mounted on the top of the mounting bracket 107. The threaded rod 110 is internally threaded to the limiting shaft 109. The bottom of the threaded rod 110 is mounted on the connecting plate 111 via the connecting bearing 119. The connecting plate 111 is fixedly connected to the corresponding sliding block 118. The drive assembly is mounted on the top of the mounting bracket 107. The output end of the drive assembly is mechanically driven by the limiting shaft 109.

[0033] In this embodiment, the rotational motion output by the drive assembly is converted into the linear lifting motion of the threaded rod 110 through the threaded engagement between the limiting rotating shaft 109 and the threaded rod 110. The transmission structure is compact and has a self-locking function. When the drive assembly stops working, the threaded rod 110 can remain in its current position without sliding down due to gravity, ensuring that the lifting plate 108 will not accidentally rise and interfere with the pressing process when it is not in the ejected state. The connecting bearing 119 prevents the connecting plate 111 from rotating during the rotation and lifting of the threaded rod 110, ensuring that the connecting plate 111 and the sliding block 118 only perform linear motion, and the structure operates reliably.

[0034] Meanwhile, a limiting rod 120 is fixedly provided on the upper surface of each of the connecting plates 111, and the top end of each limiting rod 120 passes through the top end of the corresponding mounting bracket 107.

[0035] In this embodiment, the limiting rod 120 further improves the structural stability of the connecting plate 111 in the lifting process.

[0036] In addition, each of the limiting shafts 109 is provided with a transmission gear 121 on its exterior. The servo motor 112 is mounted on the top of the mounting bracket 107. The output end of the servo motor 112 is provided with the gear reducer 113. The output end of the gear reducer 113 is provided with the output gear 114. The output gear 114 meshes with the transmission gear 121.

[0037] In this embodiment, the servo motor 112 is started, and the output speed is reduced by the gear reducer 113, which drives the output gear 114 to rotate. Since the output gear 114 meshes with the transmission gear 121, it drives the limit shaft 109 to rotate.

[0038] Furthermore, each of the limiting pivot shafts 109 is provided with two limiting rings 122 on its exterior, and the two limiting rings 122 are respectively located on the upper and lower surfaces of the top of the mounting bracket 107.

[0039] In this embodiment, the two limiting rings 122 make the structure more stable when the limiting shaft 109 rotates at the top of the mounting bracket 107.

[0040] Furthermore, each of the limiting rings 122 has an annular groove 123 on the side near the top of the corresponding mounting bracket 107. A ball bearing unit 124 is provided inside the annular groove 123, and the ball bearing unit 124 makes rolling contact with the top of the corresponding mounting bracket 107.

[0041] In this embodiment, the ball bearing unit 124 makes the limiting shaft 109 rotate more smoothly when it rotates at the top of the mounting bracket 107.

[0042] When using the acoustic composite diaphragm processing fixture for loudspeakers according to this embodiment, the operator first places multiple layers of diaphragms into the cavity 115 of the lower template 106. Then, the driving component 104 is activated, causing the upper template 105 to descend. The upper template 105 is embedded within the cavity 115, and under the combined action of heating and pressure, the multiple layers of diaphragms are pressed together to form the finished acoustic composite diaphragm. After the pressing and holding time is completed, the driving component 104 causes the upper template 105 to rise and reset, separating it from the lower template 106. Next, the two lifting units are activated, and the two servo motors 112 rotate synchronously in the forward direction. After being reduced in speed and torque by the gear reducer 113, the output gear 114 meshes with the transmission gear 121 to drive the limiting shaft 109 to rotate. The limiting shaft 109 drives the threaded rod 110 to move upward while rotating through the threaded engagement, which in turn drives the lifting plates 108 on both sides to rise synchronously along the slide groove 117 through the connecting plate 111 and the sliding block 118. The lifting plates 108 rise from the groove 116 and smoothly push the two sides of the composite film away from the inner bottom surface of the cavity 115. After the composite film is completely separated from the cavity 115, the operator can easily remove the composite film. Then, the two servo motors 112 are controlled to rotate synchronously in the reverse direction, so that the lifting plates 108 descend and reset to the groove 116. The upper surface of the lifting plates 108 is flush with the inner bottom surface of the cavity 115, and the next pressing process can be performed. This process is repeated continuously to achieve efficient, automated, and continuous production of acoustic composite diaphragms for loudspeakers.

[0043] Second embodiment: Based on the first embodiment, please refer to Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structural tooling for processing the acoustic composite diaphragm for a loudspeaker according to the second embodiment. Figure 6 for Figure 5 A magnified view of the local structure at point B.

[0044] The present invention provides a tooling for processing acoustic composite diaphragms for loudspeakers, which also includes two protective shells 201.

[0045] In this specific embodiment, each mounting bracket 107 is provided with a protective shell 201 at its top, and the protective shell 201 is disposed outside the corresponding output gear 114 and transmission gear 121.

[0046] In this embodiment, the protective shell 201 is used to protect the output gear 114 and the transmission gear 121, so as to avoid the external environment from affecting the meshing transmission of the gear pair.

[0047] Each of the protective shells 201 is provided with an injection tube 202, and a sealing plug 203 is provided at the end of each injection tube 202 away from the corresponding protective shell 201.

[0048] In this embodiment, the sealing plug 203 is removed, and gear lubricating oil can be injected into the interior of the protective shell 201 through the injection pipe 202, thereby reducing the wear of the output gear 114 and the transmission gear 121 during meshing and improving the service life of the output gear 114 and the transmission gear 121.

[0049] When using the acoustic composite diaphragm processing fixture for a loudspeaker according to this embodiment, the output gear 114 and the transmission gear 121 are protected by the protective shell 201, and gear lubricating oil can be injected into the interior of the protective shell 201 through the injection pipe 202, thereby reducing the wear of the output gear 114 and the transmission gear 121 when they mesh.

[0050] Please see Figure 7 The present invention also provides a tooling for processing an acoustic composite diaphragm for loudspeakers, which is prepared using the tooling described above. The acoustic composite diaphragm for loudspeakers includes a rigid layer 301 and at least one damping layer 302. The rigid layer 301 and the damping layer 302 are pressed together under heating and pressure conditions. The rigid layer 301 is selected from one of polyetherimide film, polyethylene naphthalate film, or polycarbonate film. The damping layer 302 is selected from one of thermoplastic polyurethane film or acrylate damping film.

[0051] In this embodiment, the acoustic composite diaphragm for loudspeakers prepared by the above-described processing fixture is simultaneously ejected from both sides of the cavity 115 by the lifting mechanism after compression molding. The composite diaphragm is subjected to uniform force during demolding, avoiding edge damage and interlayer separation defects caused by traditional prying methods. The finished product has intact edges and good bonding between the interfaces of each layer. The rigid layer 301 is made of engineering plastic film material with high rigidity and excellent heat resistance, providing sufficient structural rigidity and elastic modulus for the composite diaphragm, ensuring that the diaphragm has good resistance to deformation when the loudspeaker is outputting high power. The damping layer 302 is made of viscoelastic material with high loss factor, which can effectively suppress parasitic resonance and standing waves of the diaphragm during vibration, making the frequency response flatter.

[0052] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A fixture for processing an acoustic composite diaphragm for a loudspeaker, comprising a worktable, a support platform, a bracket, a driving component, an upper template, and a lower template, wherein the support platform is disposed on the upper surface of the worktable, the lower template is disposed above the support platform, a cavity is disposed at the top of the lower template, the bracket is mounted above the worktable, the driving component is disposed at the top of the bracket, the upper template is disposed at the output end of the driving component, and the upper template corresponds to the cavity, characterized in that... It also includes a lifting mechanism; The lifting mechanism includes two mounting brackets, two lifting units, and two lifting plates. Grooves are provided on both sides of the bottom of the cavity, and the lifting plates are disposed inside the grooves. Slide grooves are provided on both sides of the cavity. A sliding block is provided on the side of each lifting plate closest to the corresponding slide groove, and each sliding block penetrates the corresponding slide groove. The two mounting brackets are fixedly mounted on the upper surface of the workbench and are located on both sides of the support platform. Each mounting bracket is equipped with a lifting unit, and the output end of each lifting unit is connected to one of the sliding blocks.

2. The acoustic composite diaphragm processing fixture for loudspeakers as described in claim 1, characterized in that, Each of the lifting units includes a drive assembly, a limiting shaft, a threaded rod, and a connecting plate. The limiting shaft is rotatably mounted on the top of the mounting frame. The threaded rod is internally threaded to the limiting shaft. The connecting plate is mounted on the bottom of the threaded rod via a connecting bearing. The connecting plate is fixedly connected to the corresponding sliding block. The drive assembly is mounted on the top of the mounting frame, and the output end of the drive assembly is mechanically driven by the limiting shaft.

3. The acoustic composite diaphragm processing fixture for loudspeakers as described in claim 2, characterized in that, Each of the connecting plates has a limit rod fixedly installed on its upper surface, and the top end of each limit rod passes through the top end of the corresponding mounting bracket.

4. The acoustic composite diaphragm processing fixture for loudspeakers as described in claim 3, characterized in that, Each of the drive components includes a servo motor, a gear reducer, and an output gear. Each of the limit shafts has a transmission gear on its exterior. The servo motor is mounted on the top of the mounting bracket. The output end of the servo motor is provided with the gear reducer, and the output end of the gear reducer is provided with the output gear, which meshes with the transmission gear.

5. The acoustic composite diaphragm processing fixture for loudspeakers as described in claim 4, characterized in that, Each of the limiting pivots is provided with two limiting rings on its exterior, and the two limiting rings are respectively located on the upper and lower sides of the top of the mounting bracket.

6. The acoustic composite diaphragm processing fixture for loudspeakers as described in claim 5, characterized in that, Each of the limiting rings has an annular groove on the side near the top of the corresponding mounting bracket. A ball bearing unit is provided inside the annular groove, and the ball bearing unit makes rolling contact with the top of the corresponding mounting bracket.

7. The acoustic composite diaphragm processing fixture for loudspeakers as described in claim 4, characterized in that, The acoustic composite diaphragm processing fixture for loudspeakers also includes two protective shells. Each mounting bracket has a protective shell at its top, and the protective shells are disposed outside the corresponding output gear and transmission gear.

8. The tooling for processing acoustic composite diaphragms for loudspeakers as described in claim 7, characterized in that, Each of the protective shells is connected to an injection tube, and a sealing plug is provided at the end of each injection tube away from the corresponding protective shell.

9. An acoustic composite diaphragm for loudspeakers, manufactured using the acoustic composite diaphragm processing fixture as described in claim 1, characterized in that, The acoustic composite diaphragm for the loudspeaker includes a rigid layer and at least one damping layer. The rigid layer and the damping layer are pressed together under heating and pressure. The rigid layer is selected from one of polyetherimide film, polyethylene naphthalate film, or polycarbonate film. The damping layer is selected from one of thermoplastic polyurethane film or acrylate-based damping film.

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