A diaphragm moving iron unit based on magnesium-lithium alloy and a multi-stage stamping die

Abstract

The present invention relates to the field of loudspeaker technology, specifically a diaphragm moving iron unit based on magnesium-lithium alloy and a multi-stage stamping forming mold, comprising an outer frame and a partition, the partition being connected to the inner cavity of the outer frame, and also comprising a permanent magnet, a driving coil, a balanced armature, a driving rod, a diaphragm and a glue point, the two permanent magnets being respectively connected to the upper and lower sides of the right side of the inner cavity of the outer frame, the two driving coils being respectively connected to the upper and lower sides of the left side of the inner cavity of the outer frame, the balanced armature being connected to the inner cavity of the outer frame, and the balanced armature is U-shaped and wraps around the permanent magnet and the driving coil on the lower side, the driving rod being connected to the upper side of the balanced armature, the diaphragm being connected to the partition, a through hole being opened in the middle of the diaphragm, and a side plate being connected to the lower side of the through hole, and the side plate giving the diaphragm a supporting force when the diaphragm needs to move upward, pushing the diaphragm to move upward, thereby reducing the bearing tension of the diaphragm, thereby achieving the purpose of increasing the service life of the moving iron unit.

Description

Technical Field

[0001] The present invention relates to the technical field of loudspeakers, and in particular to a diaphragm moving iron unit based on a magnesium-lithium alloy and a multi-stage stamping die. Background Art

[0002] A balanced armature driver, also known as a balanced armature driver, is a simple sound-producing unit with fast transient response and clear, transparent sound. The driver's mid- and high-frequency performance is precise and clear, providing an immersive sound experience. Therefore, it is often used in conjunction with dynamic coil drivers in audio equipment. By integrating digital signals, audio equipment is less susceptible to noise and electromagnetic interference during transmission and processing, ensuring stable transmission quality over long distances.

[0003] When the audio electrical signal (alternating current) passes through the driving coil of the dynamic iron unit, the driving coil will generate a changing electromagnetic field. The electromagnetic field acts on the balanced armature, driving the movable end of the balanced armature to produce a tiny deflection vibration. This vibration is amplified and transmitted to the driving rod, and then transmitted to the diaphragm through the driving rod, causing the diaphragm to vibrate and squeeze the air to produce sound. However, the diaphragm and the driving rod are usually bonded with adhesive, and the glue dots are on the upper side of the diaphragm. When used at high volume, the driving rod swings with a large amplitude, which causes the glue dots to bear a large tensile force when the driving rod swings upward (the diaphragm itself is elastic, and when it moves greatly, the force generated by the diaphragm's reset is large) to drive the diaphragm to move upward. However, the fatigue resistance of the adhesive itself is limited. When used for a long time, the glue layer is prone to cracking at the connection interface, which in turn affects the use of the dynamic iron earphones.

[0004] In response to the above problems, some solutions have been proposed in the prior art. For example, the diaphragm is connected to the drive rod by snapping, so that when the diaphragm vibrates upward, the metal drive rod provides support and pulling force, thereby achieving the purpose of increasing the service life of the moving iron unit. However, the moving iron unit is small in size, and the drive rod diaphragm needs to be processed for docking by snapping, and the processing technology is complicated, resulting in a high cost of the moving iron unit.

[0005] To this end, a diaphragm moving iron unit based on magnesium-lithium alloy and a multi-stage stamping die are proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a diaphragm moving iron unit and a multi-stage stamping mold based on magnesium-lithium alloy, which solves the problem that when used at a high volume, the glue points are easily separated from the diaphragm due to the large tensile force borne by the glue points. By setting side panels, when the diaphragm needs to move upward, the side panels rely on the driving rod to provide supporting force to the diaphragm, pushing the diaphragm up. When the diaphragm moves down, the diaphragm is driven downward by the glue points, thereby reducing the tensile force borne by the diaphragm and achieving the purpose of increasing the service life of the moving iron unit.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A diaphragm moving iron unit based on magnesium-lithium alloy includes an outer frame and a partition, the partition is connected to the inner cavity of the outer frame, and also includes a permanent magnet, a driving coil, a balanced armature, a driving rod, a diaphragm and glue points, the two permanent magnets are respectively connected to the upper and lower sides of the right side of the inner cavity of the outer frame, the two driving coils are respectively connected to the upper and lower sides of the left side of the inner cavity of the outer frame, the balanced armature is connected to the inner cavity of the outer frame, and the balanced armature is U-shaped and wraps around the permanent magnet and driving coil on the lower side, the driving rod is connected to the upper side of the balanced armature, the diaphragm is connected to the partition, a through hole is opened in the middle of the diaphragm, a side piece is connected to the lower side of the through hole, the top of the driving rod passes through the through hole, and the glue point covers the upper side of the connection surface between the diaphragm and the driving rod. When the balanced armature swings, the driving rod and the glue point respectively bear the force of pushing the diaphragm up and pulling the diaphragm down.

[0009] Through the above solution, the source of the driving force when the diaphragm vibrates upward is changed, so that the power of the driving rod to drive the vibration upward comes from the supporting force, which effectively reduces the upward force on the glue point and increases the service life of the moving iron unit.

[0010] Preferably, the diaphragm includes a frame, a diaphragm and a substrate, the frame is connected to the inner wall of the partition, the diaphragm is connected to the lower side of the frame, the substrate is connected to the middle part of the upper side of the diaphragm, the through hole is opened on the substrate, the diaphragm is provided with a ring runway, and the substrate is made of magnesium-lithium alloy.

[0011] Through the above solution, the substrate is made of magnesium-lithium alloy, which has the advantages of light weight and high strength. The light weight allows the slight vibration of the balanced armature under weak current to drive the diaphragm to vibrate, effectively ensuring the sensitivity of the moving iron unit. The high strength makes the substrate less likely to deform when subjected to the thrust brought by the driving rod, effectively improving the service life of the moving iron unit.

[0012] Preferably, the driving rod includes a supporting section and a connecting section, the supporting section is connected to the upper side of the balancing armature, the connecting section is fixed to the top of the supporting section, and the diameter of the connecting section is smaller than the diameter of the supporting section, the connecting section passes through the diaphragm, and the through hole is adapted to be snap-fitted to the connecting section.

[0013] Through the above scheme, the diameter of the support section is larger, and when assembling the moving iron unit, the position of the substrate can be based on the support section, which is convenient for positioning the diaphragm. At the same time, the support section can provide supporting force to the diaphragm when pushing the diaphragm, reducing the force of the glue point pulling the vibration upward, thereby avoiding excessive force on the glue point and separation from the diaphragm, effectively improving the service life of the moving iron unit.

[0014] A multi-stage stamping mold for a diaphragm based on a magnesium-lithium alloy, comprising any one of the above-mentioned diaphragm moving iron units based on a magnesium-lithium alloy, is installed on a stamping machine. The multi-stage stamping mold comprises a fixed plate and a moving plate, and also comprises a fixed mold, a moving mold, a movable component, a punch, a limit component and a support block. The fixed mold is connected to the upper side of the fixed plate, and the movable mold is connected to the lower side of the movable plate. The surface of the fixed mold is provided with a cavity adapted to the frame and the substrate, and the surface of the movable mold is provided with a runway groove. The movable component is connected to the inner cavity of the fixed mold, the punch is connected to the upper side of the movable component, the limit component is connected to the inner cavity of the movable mold, and the support block is connected to the lower side of the limit component. When the punching machine drives the movable component to move upward, the punch cuts the substrate. When the punch moves to a specified position, the limit component releases the limit on the support block to give the punch space to move further upward.

[0015] Through the above solution, it is achieved that a hole in the shape of a punch is first punched out on the surface of the substrate, and then the punch is moved upward to bend the substrate at the through hole to form a side piece.

[0016] Preferably, the movable component includes a slide plate, an ejector pin and a push spring, the slide plate is connected to the inner cavity of the fixed mold, the ejector pin is connected to the upper side of the slide plate, the push spring is wound around the outer circumference of the ejector pin, and the two ends of the push spring are respectively connected to the slide plate and the fixed mold, and the upper end surface of the ejector pin is lower than the upper end surface of the punch.

[0017] With the above solution, the top of the ejector pin is lower than the top of the punch, so that the ejector pin and the punch protrude from the upper surface of the fixed mold in sections, making it easier to push the diaphragm out when the mold is opened.

[0018] Preferably, air holes are opened on the surface of the fixed mold, and the air holes extend into the inner cavity of the fixed mold, and the positions of the air holes correspond to the runway grooves.

[0019] Through the above solution, when the slide moves upward, the inner cavity of the fixed mold can be squeezed, so that the gas in the inner cavity of the fixed mold passes through the air holes and acts on the runway groove, and then the diaphragm is bent and fits in the runway groove through the gas.

[0020] Preferably, the limiting assembly includes a sliding frame, a slide, a return spring, a slider, an opening spring and a limit block, the sliding frame is connected to the inner cavity of the movable mold, the slide is connected to the inner cavity of the sliding frame, the return spring is connected to the upper side of the slide, the slider is connected to the inner cavity of the slide, the opening spring is connected to the upper side of the slider, the limit block is connected to the side wall of the slider, and the limit block passes through the slide and is connected to the sliding frame.

[0021] Through the above solution, the limiting block passes through the slide and is connected to the slide frame, so that the position of the slide and the slide frame are relatively fixed, and the position of the support block connected to the surface of the slide is fixed, which is convenient for punching the substrate.

[0022] Preferably, the upper end surface of the slider is higher than the upper end surface of the support block, and a slide groove is provided on the surface of the slider. The limit block is connected to the slider through the slide groove, and the slide groove is inclined. Thus, the slide groove is inclined, so that when the slider moves, the limit block gradually separates from the slide frame, thereby releasing the lock on the slide, and making it easier for the punch to bend the side piece on the substrate.

[0023] Preferably, a heating rod is connected to the side of the fixed mold, the left and right side walls of the punch are inclined, and there is a height difference between the two side walls, and the lower end of the slider is connected to a supporting block, and the supporting block has the same structure as the adjacent end face of the punch.

[0024] Through the above scheme, the heating rod connected to the side of the fixed mold facilitates the hot melt connection of the substrate, frame and diaphragm. The height difference between the left and right sides of the punch enables the side panels on both sides to be bent successively when the punch bends the side panels. As a result, when the punch bends a single side panel, the pressure is concentrated on the single side panel, thereby facilitating the bending and deformation of the side panel.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention solves the problem that when the volume is high, the glue points are subjected to a large tensile force, which causes the glue points to easily separate from the diaphragm. By setting side pieces and making the lower end faces of the side pieces fit with the upper end faces of the support sections, on the one hand, when the moving iron unit is assembled, the installation height of the substrate in the diaphragm can be assembled based on the top of the support section, thereby reducing the influence of the elastic reset amount of the annular runway on the diaphragm on the installation position of the substrate, thereby reducing the difference between the moving iron units and achieving the purpose of facilitating the calibration of the sound quality. On the other hand, when the driving rod swings upward, the support section can provide supporting force to the side pieces, thereby reducing the tensile force of the glue points and achieving the purpose of prolonging the service life of the moving iron unit.

[0027] 2. By setting the driving rod, the side piece fits with the connecting end, thereby increasing the contact area between the substrate and the connecting section, and increasing the friction between the side piece and the connecting section, which makes it easier for the driving rod to drive the substrate downward, thereby achieving the purpose of reducing the bearing capacity of the glue point when driving the substrate downward. On the other hand, since the swing of the balance armature is based on the bending point, the driving rod has a certain curvature when swinging, and the setting of the side piece increases the contact area between the substrate and the driving rod, thereby reducing the pressure between the driving rod and the substrate when swinging, thereby increasing the service life of the moving iron unit.

[0028] 3. By setting up movable components, when the slide moves up, on the one hand, it can drive the punch to move up to realize cutting of the substrate. On the other hand, when the substrate moves up, it can squeeze the inner cavity of the fixed mold, so that the gas in the inner cavity of the fixed mold passes through the air holes and acts on the diaphragm, so that the diaphragm is fitted on the runway groove under the action of air pressure, completing the shaping, thereby achieving the purpose of facilitating the production of diaphragms. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of the moving iron unit of the present invention;

[0030] Figure 2 Schematic diagram of the structure of the diaphragm part of the present invention;

[0031] Figure 3 For the present invention Figure 2 A is an enlarged schematic diagram;

[0032] Figure 4 This is a schematic diagram of the structure of the diaphragm portion of the present invention when viewed from above;

[0033] Figure 5 Schematic diagram of the overall structure of the mold of the present invention;

[0034] Figure 6 It is a structural diagram of the movable component part of the present invention;

[0035] Figure 7 Schematic diagram of the structure of the movable mold of the present invention;

[0036] Figure 8 It is a structural schematic diagram of the limiting component part of the present invention;

[0037] Figure 9 It is a structural schematic diagram of the punching knife part of the present invention;

[0038] Figure 10 This is a schematic diagram of the state after the present invention is installed.

[0039] In the figure: 1. outer frame; 2. partition; 3. permanent magnet; 4. driving coil; 5. balancing armature; 6. driving rod; 601. supporting section; 602. connecting section; 7. diaphragm; 701. frame; 702. diaphragm; 703. base plate; 704. through hole; 705. side plate; 8. glue point; 9. fixed plate; 10. moving plate; 11. fixed mold; 1101. cavity; 1102. heating rod; 1103. air hole ; 12. Moving mold; 1201. Runway groove; 13. Movable assembly; 1301. Slide plate; 1302. Ejector pin; 1303. Push spring; 14. Punch; 15. Limit assembly; 1501. Slide frame; 1502. Slide; 1503. Return spring; 1504. Slider; 15041. Slide groove; 15042. Loading block; 1505. Opening spring; 1506. Limit block; 16. Support block. DETAILED DESCRIPTION

[0040] The following, in conjunction with the accompanying drawings of the embodiments of the present invention, clearly and completely describes the technical solutions of the embodiments of the present invention, making its working state and structural features more detailed. Obviously, the embodiments described are only partial embodiments of the present invention and are not complete embodiments. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in this field without making any creative ideas are all within the scope of protection of the present invention.

[0041] See also Figures 1 to 4 The present invention provides a diaphragm moving iron unit based on magnesium-lithium alloy, and the technical solution is as follows:

[0042] For details, please refer to Figure 1 、 Figure 2 and Figure 3, a diaphragm moving iron unit based on magnesium-lithium alloy, including an outer frame 1 and a partition 2, the partition 2 is connected to the inner cavity of the outer frame 1, the partition 2 divides the inner cavity of the outer frame 1 into two parts, and a sound hole is opened on the right side of the outer frame 1. It also includes a permanent magnet 3, a driving coil 4, a balanced armature 5, a driving rod 6, a diaphragm 7 and a glue point 8. The two permanent magnets 3 are respectively connected to the upper and lower sides of the right side of the inner cavity of the outer frame 1, and the two driving coils 4 are respectively connected to the upper and lower sides of the left side of the inner cavity of the outer frame 1. The balanced armature 5 is connected to the inner cavity of the outer frame 1, and the balanced armature 5 is U-shaped to wrap the permanent magnet 3 and the driving coil 4 on the lower side. The opening of the balanced armature 5 faces the right side, and the driving rod 6 It is connected to the upper side of the balanced armature 5, and the diaphragm 7 is connected to the partition 2. The partition 2 is "L"-shaped. A through hole 704 is opened in the middle of the diaphragm 7. The lower side of the through hole 704 is connected to the side piece 705. The top of the driving rod 6 passes through the through hole 704. The top of the driving rod 6 passes through the middle of the diaphragm 7. The glue point 8 covers the upper side of the connection surface between the diaphragm 7 and the driving rod 6. Since the dynamic iron earphone needs to ensure its transient response speed, the area of ​​the glue point 8 is limited, and the relative position between the diaphragm 7 and the driving rod 6 is fixed. When the balanced armature 5 swings, the driving rod 6 and the glue point 8 respectively bear the force of pushing the diaphragm 7 up and pulling the diaphragm 7 down.

[0043] By setting the driving rod 6, the power for the upward movement of the diaphragm 7 is driven by the supporting force provided by the driving rod 6, thereby effectively reducing the tension on the glue point 8, ensuring the firmness of the connection between the glue point 8 and the diaphragm 7, and improving the service life of the moving iron unit when working at a high volume.

[0044] As an embodiment of the present invention, refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 9 The diaphragm 7 includes a frame 701, a diaphragm 702 and a substrate 703. The frame 701 is connected to the inner wall of the partition 2. The diaphragm 702 is connected to the lower side of the frame 701. The diaphragm 702 and the frame 701 are connected by hot melt adhesive. The substrate 703 is connected to the middle of the upper side of the diaphragm 702. The substrate 703 and the diaphragm 702 are connected by hot melt adhesive. The side piece 705 and the substrate 703 are integrally formed (such as Figure 9 As shown, Figure 9 The middle substrate 703 is cut), the side piece 705 is bent by a multi-stage stamping die, and the chamfer formed at the bend of the inner wall of the through hole 704 on the substrate 703 (such as Figure 3As shown), when the glue dots 8 are covered, the glue dots 8 will fill the chamfers, thereby effectively increasing the contact area between the glue dots 8 and the substrate 703, thereby achieving the purpose of improving the firmness of the connection between the glue dots 8 and the substrate 703. A circular runway is provided on the diaphragm 702, and the circular runway is arranged in the gap between the frame 701 and the substrate 703. The substrate 703 is made of a magnesium-lithium alloy material, which is light in texture and high in strength. The driving rod 6 includes a supporting section 601 and a connecting section 602. The supporting section 601 is connected to the upper side of the balanced armature 5, and the lower side of the balanced armature 5 is the fixed end and the upper side is the movable end. When current passes through the driving coil 4, the magnetic force generated by the driving coil 4 will drive the movable end of the balanced armature 5 to swing, thereby driving the supporting section 601 to swing. The connecting section 602 is fixed at the top of the supporting section 601, and the supporting section 601 drives the connecting section 602 to swing. The connecting section 602 penetrates the diaphragm 7, and the connecting section 602 carries When the dynamic diaphragm 7 vibrates, the diameter of the connecting section 602 is smaller than the diameter of the supporting section 601, the lower end surface of the side piece 705 fits with the upper end surface of the supporting section 601, the through hole 704 is adapted to be snapped into the connecting section 602, and the inner wall of the side piece 705 fits with the connecting section 602. The bending setting of the side piece 705, on the one hand, increases the contact area between the side piece 705 and the connecting section 602, thereby increasing the friction between the side piece 705 and the connecting section 602, making it easier for the driving rod 6 to drive the substrate 703 downward, reducing the bearing capacity of the glue point 8 when driving the substrate 703 downward. On the other hand, since the swing of the balancing armature 5 is based on the bending point, the driving rod 6 has a certain curvature when swinging, and the setting of the side piece 705 increases the contact area between the substrate 703 and the driving rod 6, thereby reducing the pressure between the driving rod 6 and the substrate 703 when swinging, thereby increasing the service life of the moving iron unit.

[0045] By setting up the diaphragm 7, the substrate 703 is made of a magnesium-lithium alloy material with high strength and light weight, so that when the balanced armature 5 vibrates slightly under a weak current, the substrate 703 can vibrate in response to the vibration of the balanced armature 5, thereby improving the sensitivity of the moving iron unit. The side piece 705 is formed on the substrate 703 by stamping and bending, and the lower end of the side piece 705 is fit with the upper end of the support section 601. Then, when the moving iron unit is assembled, the installation position of the substrate 703 in the diaphragm 7 can be assembled based on the top of the support section 601, thereby reducing the influence of the elasticity of the annular runway on the diaphragm 702 on the position of the substrate 703, thereby reducing the differences between the moving iron units, and achieving the purpose of facilitating the calibration of the sound quality.

[0046] See also Figures 1 to 10A multi-stage stamping die for a diaphragm based on a magnesium-lithium alloy is suitable for producing any of the above-mentioned diaphragm movable iron units based on a magnesium-lithium alloy. The multi-stage stamping die is installed on a stamping machine. The multi-stage stamping die includes a fixed plate 9 and a movable plate 10. The stamping machine has two hydraulic cylinders, one of which has an output end connected to the movable plate 10. It also includes a fixed die 11, a movable die 12, a movable component 13, a punch 14, a limit component 15 and a support block 16. The fixed die 11 is connected to the upper side of the fixed plate 9, the movable die 12 is connected to the lower side of the movable plate 10, and the fixed die 11 is connected to the upper side of the fixed plate 9. The movable die 12 is connected to the lower side of the movable plate 10. A cavity 1101 adapted to the frame 701 and the substrate 703 is provided on the surface, a runway groove 1201 is provided on the surface of the movable mold 12, the movable component 13 is connected to the inner cavity of the fixed mold 11, the punch 14 is connected to the upper side of the movable component 13, the limiting component 15 is connected to the inner cavity of the movable mold 12, and the support block 16 is connected to the lower side of the limiting component 15. When the punching machine drives the movable component 13 to move upward, the punch 14 cuts the substrate 703. When the punch 14 moves to the specified position, the limiting component 15 releases the limit on the support block 16 to give the punch 14 space to move further upward.

[0047] By setting up a mold, a hole in the shape of a punch 14 is first punched out on the surface of the substrate 703 , and then the punch 14 is further moved to bend the substrate 703 at the through hole 704 to form a side piece 705 to complete the stamping of the diaphragm 7 .

[0048] As an embodiment of the present invention, refer to Figure 5 、 Figure 6 and Figure 10 The movable component 13 includes a slide 1301, an ejector pin 1302 and a push spring 1303. The slide 1301 is slidably connected to the inner cavity of the fixed mold 11. Another hydraulic cylinder of the punching machine is connected to the slide 1301 through the fixed plate 9. The ejector pin 1302 is connected to the upper side of the slide 1301. There are two slides 1301, and the two slides 1301 are distributed up and down. The diameter of the lower end of the ejector pin 1302 is larger. The lower end of the ejector pin 1302 is clamped between the two slides 1301. The two slides 1301 are fixed by screws. By removing the screws, the ejector pin 1302 can be repaired and replaced. The punch 14 is connected to the slide 1301. , and the diameter of the lower end of the punching knife 14 is larger, and the lower end of the punching knife 14 is clamped between the two slides 1301, which is convenient for repairing and replacing the punching knife 14. The push spring 1303 is wrapped around the outer periphery of the ejector pin 1302, and the two ends of the push spring 1303 are respectively connected to the slide 1301 and the fixed mold 11. When the slide 1301 is not subjected to force, the push spring 1303 pushes the slide 1301 to move downward and fit the upper end surface of the fixed plate 9. The upper end surface of the ejector pin 1302 is lower than the upper end surface of the punching knife 14. The surface of the fixed mold 11 is provided with an air hole 1103, which extends into the inner cavity of the fixed mold 11, and the air hole 1103 corresponds to the position of the runway groove 1201.

[0049] By setting the movable component 13, when the slide plate 1301 moves up, the ejector pin 1302 and the punching knife 14 can be driven to move up. The upward movement of the punching knife 14 can realize the cutting of the substrate 703 and the bending of the side piece 705. The upper end surface of the ejector pin 1302 is lower than the upper end surface of the punching knife 14. Then, when the mold is opened, the slide plate 1301 drives the ejector pin 1302 to continue to move up to the specified position, and the ejector pin 1302 pushes the substrate 703 and the frame 701 out of the fixed mold 11, so that when the substrate 703 is pushed out, the punching knife 14 passes through the substrate 703 to position the finished diaphragm 7, thereby avoiding the substrate 703 and the frame 701 from being heated by the heating rod 1102. The thermal expansion causes the substrate 703 and the frame 701 to be limited by the fixed mold 11, resulting in the explosive release of the accumulated thrust when the substrate 703 and the frame 701 are pushed to the specified position at the moment the constraint is released, causing the substrate 703 and the frame 701 to be ejected in a catapult-like manner, resulting in damage to the diaphragm 7. On the other hand, the locking of the position of the diaphragm 7 after production facilitates subsequent adaptation to automated production, that is, rapid loading and unloading can be achieved through the use of a robotic arm to improve production efficiency. When the substrate 703 moves upward, it can compress the inner cavity of the fixed mold 11, so that the gas in the inner cavity of the fixed mold 11 passes through the air hole 1103 and acts on the diaphragm 702, so that the diaphragm 702 is shaped along the runway under the action of air pressure.

[0050] As an embodiment of the present invention, refer to Figure 7 、 Figure 8 、 Figure 9 and Figure 10 The limiting assembly 15 includes a sliding frame 1501, a slide 1502, a return spring 1503, a slider 1504, an opening spring 1505 and a limiting block 1506. The sliding frame 1501 is connected to the inner cavity of the movable mold 12 by bolts. The sliding frame 1501 can be disassembled. The slide 1502 is slidably connected to the inner cavity of the sliding frame 1501. The return spring 1503 is connected to the upper side of the slide 1502. The upper end of the return spring 1503 contacts the movable plate 10. In the initial state, the return spring 1503 pushes the lower end surface of the slide 1502 to fit the lower side of the inner cavity of the movable mold 12. The slider 1504 is connected to the inner cavity of the slide 1502, the opening spring 1505 is connected to the upper side of the slide 1504, the limit block 1506 is connected to the side wall of the slide 1504, and the limit block 1506 passes through the slide 1502 and is connected to the slide frame 1501. When the limit block 1506 passes through the slide 1502 and the slide frame 1501, the position of the slide 1502 is locked, and the support block 16 is connected to the lower side of the slide 1502, and then the position of the support block 16 is locked. When the punching knife 14 is punching, the substrate 703 is at the position of the support block 16 to form a straight side piece 705 (such as Figure 9As shown in the figure), the lower end face of the slider 1504 is connected to a supporting block 15042, and the supporting block 15042 has the same structure as the adjacent end face of the punching knife 14. The lower end face of the supporting block 15042 is lower than the lower end face of the support block 16, and thus in the initial state, the supporting block 15042 can push the cut waste out from between the two support blocks 16. A slide groove 15041 is provided on the surface of the slider 1504, and the limit block 1506 is connected to the slider 1504 through the slide groove 15041. The slide groove 15041 is inclined, and the limit block 1506 is limited by the slide 1502 and can only slide left and right. The side of the fixed mold 11 is connected to the heating rod 1102, and the left and right side walls of the punching knife 14 are inclined, and there is a height difference between the two side walls.

[0051] By setting the limiting component 15, the punching knife 14 corresponds to the shape of the adjacent end face of the supporting block 15042, so that the punching knife 14 can retain the side panel 705 during punching. The heights on both sides of the punching knife 14 are different, so that when the punching knife 14 is punching, the two side panels 705 are punched out one after another, thereby effectively increasing the pressure when punching a single side panel 705, and facilitating the deformation of the side panel 705.

[0052] The working principle of the balanced iron unit: When an audio signal (AC) passes through the drive coil 4, the drive coil 4 generates a magnetic force that causes the balanced armature 5 to swing. The balanced armature 5 drives the diaphragm 7 to vibrate through the drive rod 6. When the balanced armature 5 tends to swing upward, the support section 601 of the drive rod 6 applies pressure to the side plate 705, which in turn pushes the base plate 703 upward to vibrate.

[0053] The working principle of the multi-stage stamping mold: Initially, the substrate 703 and the frame 701 are placed in the cavity 1101 of the fixed mold 11, and the diaphragm 702 is placed on the fixed mold 11, and the fixed mold 11 is heated by the heating rod 1102. At this time, the return spring 1503 pushes the slide 1502 to move down to fit with the bottom wall of the movable mold 12, and the spring 1505 is opened to push the slider 1504 down, so that the limit block 1506 extends and engages with the slide frame 1501, and then the positions of the slide 1502 and the slide frame 1501 are relatively fixed, so that the position of the support block is locked; during stamping, the punching machine drives the movable mold 12 to move down and fit with the fixed mold 11 through the movable plate 10. The temperature of the fixed mold 11 causes the diaphragm 702 to fit with the frame 701 and the substrate 703, and at the same time The hydraulic cylinder connected to the fixed mold 11 pushes the slide 1301 to move upward, and the slide 1301 moves upward to drive the punching knife 14 to contact the base plate 703. The base plate 703 is cut into the shape of the punching knife 14 by the action of the punching knife 14. The side piece 705 is supported by the slide 1502 through the support block 16 to maintain a vertical shape. The bearing block 15042 is pushed by the punching knife 14 to drive the slide 1504 to move upward, so that the opening spring 1505 contracts. The slide 1504 moves upward to drive the limit block 1506 to slide along the slide groove 15041. The limit block 1506 gradually disengages from the slide frame 1501, thereby releasing the lock on the slide 1502. At this time, the top of the base plate 703 loses support. As the punching knife 14 moves further upward, the side piece 705 of the base plate 703 bends.

[0054] When the slide plate 1301 moves upward, the slide plate 1301 will compress the inner cavity of the fixed mold 11, so that the gas in the inner cavity of the fixed mold 11 flows upward through the air hole 1103. The air flow in the air hole 1103 is affected by the heating rod 1102 during the flow to form a hot air flow, and the position of the air hole 1103 is opposite to the position of the runway groove 1201. Then the air flow will push the diaphragm 702 to fit onto the runway groove 1201, and the high temperature will cause the diaphragm 702 to produce plastic deformation. The diaphragm 702 is affected by the air pressure to form a circular runway.

[0055] Although the embodiments of the present invention have been described, it is possible for those skilled in the art to change and modify the embodiments to obtain other effects with an understanding of the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A diaphragm moving iron unit based on a magnesium-lithium alloy, comprising an outer frame (1) and a partition (2), wherein the partition (2) is connected to an inner cavity of the outer frame (1), and is characterized in that: It also includes a permanent magnet (3), a driving coil (4), a balancing armature (5), a driving rod (6), a diaphragm (7) and a glue point (8), wherein the two permanent magnets (3) are respectively connected to the upper and lower sides of the right side of the inner cavity of the outer frame (1), and the two driving coils (4) are respectively connected to the upper and lower sides of the left side of the inner cavity of the outer frame (1). The balancing armature (5) is connected to the inner cavity of the outer frame (1), and the balancing armature (5) is U-shaped and wraps around the permanent magnet (3) and the driving coil (4) on the lower side. The driving rod (6) is connected to the balancing armature (5). On the upper side of the armature (5), the diaphragm (7) is connected to the partition (2), a through hole (704) is opened in the middle of the diaphragm (7), a side plate (705) is connected to the lower side of the through hole (704), the top of the driving rod (6) passes through the through hole (704), and the glue point (8) covers the upper side of the connection surface between the diaphragm (7) and the driving rod (6), and when the balanced armature (5) swings, the driving rod (6) and the glue point (8) respectively bear the force of pushing the diaphragm (7) upward and pulling the diaphragm (7) downward; The diaphragm (7) comprises a frame (701), a diaphragm (702) and a substrate (703), wherein the frame (701) is connected to the inner wall of the partition (2), the diaphragm (702) is connected to the lower side of the frame (701), and the substrate (703) is connected to the middle part of the upper side of the diaphragm (702). The through hole (704) is opened on the substrate (703), and the diaphragm (702) is provided with an annular runway. The substrate (703) is made of a magnesium-lithium alloy material; The driving rod (6) comprises a supporting section (601) and a connecting section (602), wherein the supporting section (601) is connected to the upper side of the balanced armature (5), and the connecting section (602) is fixed to the top of the supporting section (601), and the diameter of the connecting section (602) is smaller than the diameter of the supporting section (601), and the connecting section (602) passes through the diaphragm (7), and the through hole (704) is adapted to be snap-fitted to the connecting section (602).

2. A multi-stage stamping die for a diaphragm based on a magnesium-lithium alloy, which is suitable for a diaphragm movable iron unit based on a magnesium-lithium alloy as claimed in claim 1, and is installed on a stamping machine. The multi-stage stamping die comprises a fixed plate (9) and a movable plate (10), and is characterized in that: The invention also includes a fixed mold (11), a movable mold (12), a movable assembly (13), a punch (14), a limit assembly (15) and a support block (16), wherein the fixed mold (11) is connected to the upper side of the fixed plate (9), the movable mold (12) is connected to the lower side of the movable plate (10), the surface of the fixed mold (11) is provided with a cavity (1101) adapted to the frame (701) and the base plate (703), the surface of the movable mold (12) is provided with a runway groove (1201), the movable assembly (13) is connected to the fixed mold (11), and the movable assembly (13) is connected to the fixed mold (11). In the inner cavity of the mold (11), the punching knife (14) is connected to the upper side of the movable component (13), the limiting component (15) is connected to the inner cavity of the movable mold (12), and the support block (16) is connected to the lower side of the limiting component (15). When the punching machine drives the movable component (13) to move upward, the punching knife (14) cuts the substrate (703). When the punching knife (14) moves to a specified position, the limiting component (15) releases the limit on the support block (16) and gives the punching knife (14) space to move further upward.

3. The multi-stage stamping die for a diaphragm based on a magnesium-lithium alloy according to claim 2, characterized in that: The movable component (13) includes a slide plate (1301), an ejector pin (1302) and a push spring (1303), wherein the slide plate (1301) is connected to the inner cavity of the fixed mold (11), the ejector pin (1302) is connected to the upper side of the slide plate (1301), the push spring (1303) is wound around the outer periphery of the ejector pin (1302), and the two ends of the push spring (1303) are respectively connected to the slide plate (1301) and the fixed mold (11), and the upper end surface of the ejector pin (1302) is lower than the upper end surface of the punch (14).

4. The multi-stage stamping die for a diaphragm based on a magnesium-lithium alloy according to claim 3, characterized in that: The surface of the fixed mold (11) is provided with air holes (1103), the air holes (1103) extending into the inner cavity of the fixed mold (11), and the positions of the air holes (1103) and the runway grooves (1201) correspond to each other.

5. The multi-stage stamping die for a diaphragm based on a magnesium-lithium alloy according to claim 2, characterized in that: The limiting assembly (15) includes a sliding frame (1501), a slide (1502), a return spring (1503), a slider (1504), an opening spring (1505) and a limiting block (1506), wherein the sliding frame (1501) is connected to the inner cavity of the movable mold (12), the slide (1502) is connected to the inner cavity of the sliding frame (1501), the return spring (1503) is connected to the upper side of the slide (1502), the slider (1504) is connected to the inner cavity of the slide (1502), the opening spring (1505) is connected to the upper side of the slider (1504), the limiting block (1506) is connected to the side wall of the slider (1504), and the limiting block (1506) passes through the slide (1502) and is connected to the sliding frame (1501).

6. The multi-stage stamping die for a diaphragm based on a magnesium-lithium alloy according to claim 5, characterized in that: The upper end surface of the slider (1504) is higher than the upper end surface of the support block (16), and a slide groove (15041) is provided on the surface of the slider (1504). The limit block (1506) is connected to the slider (1504) through the slide groove (15041), and the slide groove (15041) is inclined.

7. The multi-stage stamping die for a diaphragm based on a magnesium-lithium alloy according to claim 6, characterized in that: The side of the fixed mold (11) is connected to a heating rod (1102), the left and right side walls of the punching knife (14) are both inclined, and there is a height difference between the two side walls, and the lower end of the slider (1504) is connected to a supporting block (15042), and the supporting block (15042) has the same structure as the adjacent end face of the punching knife (14).

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