Pre-bent circular dome metal sound-emitting bullet and sound-emitting device

Abstract

The application discloses a pre-bent circular arch metal sound-making bullet and a sound-making device. The sound-making bullet is a shallow arch double-stable metal sheet formed by stamping in one piece, which is composed of a circular arch, a corrugated flexible hinge belt and an epitaxial belt arranged in one piece. The thickness, arch diameter, arch height, corrugation parameters and material of the bullet are limited, and the sound-making frequency covers the sensitive frequency band of human ears. The bullet can be bidirectionally jumped and turned over under the action of external force, bidirectionally vibrate and make sound, and the sound effects are different, so that unique rhythmical intermittent sound can be formed. The sound-making device comprises a cavity shell, a gas pressure pipe and a sound output loudspeaker. The bullet divides the cavity into a gas-tight gas pressure cavity and a resonance cavity, and is matched with a switchable joint, which is compatible with two driving modes of blowing and sucking and ball pinching. The application has the advantages of simple structure, convenient processing, labor-saving driving, rich and stable sound effects, good mass production property, and wide application range, and is suitable for scenes such as literary and artistic relief, interesting and intellectual toys and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of cultural and sports cheering props and fun sounding toys, in particular to a pre-bent circular dome metal sounding shrapnel and a sounding device. Background Art

[0002] Driven by the diversified economy, the consumption scenarios in the cultural-entertainment and sports fields continue to diversify, and the application demands for cheering props, fun toys and the like in sports events, concerts and festival activities are increasingly enriched. Various acousto-optic cheering supplies such as glow sticks, cheering sticks, horns, and light-emitting accessories have appeared on the market one after another. The sounding tools in current scenarios mainly rely on manpower or mechanical drive to realize pneumatic, electric and piezoelectric vibration sounding. The mainstream sounding forms include air horns, electric loudspeakers and piezoelectric sounders. Among them, most pneumatic sounding devices rely on compressed air power to drive diaphragms and reeds to vibrate and produce sound, with relatively single product structure and sounding form.

[0003] A typical representative of traditional fun pneumatic sounding is the glass Ge Beng (Liuli Ge Beng), whose sounding principle is similar to the snap-buckling sudden change shock wave sounding principle of the present invention, and the production technique of the glass Ge Beng was included in the first batch of intangible cultural heritage list of Shanxi Province in 2007. However, the glass Ge Beng is a purely handmade glass product with uneven wall thickness and extremely easy to break, which is only driven by blowing and sucking through the mouth, has an extremely short service life, and has safety hazards such as cutting injuries caused by broken glass and inhalation of broken residues during use. It cannot meet the safety standards and scenario use requirements of cultural and sports cheering and toy categories, and can only be used as a nostalgic niche product, making it difficult to be popularized and applied on a large scale.

[0004] Most of the existing pre-bent circular dome metal shrapnels are applied in industrial fields such as electronic keyboards and power switches, and are mostly of small diameter and monostable structure, only used for storing reset energy, with low sounding volume and short sound, and do not have the sounding effect required for cultural and sports cheering and fun toys. At present, there is a lack of mature application cases in the industry for bistable metal sounding shrapnels and complete sets of sounding devices that are adapted to cultural-entertainment and sports scenarios, with large size, high volume, and comfortable frequency band for human ears. In view of the shortcomings of the prior art, there is an urgent demand in the market for a metal shrapnel sounding device that is safe and durable, has interesting sounding effects, is adapted to pneumatic drive, and can be assembled in multiple forms, so as to meet the use demands of diversified cheering atmosphere creation and fun toys. Summary of the Invention

[0005] In order to make up for the above deficiencies, the present invention provides a pre-bent circular dome metal sounding shrapnel and a sounding device, aiming to solve the technical problems that the existing sounding devices have safety hazards, poor durability, single sounding form, limited adapted scenarios, lack of sounding structures adapted to pneumatic drive and capable of multi-form combined assembly, and are difficult to meet the use demands of diversified cultural and sports cheering atmosphere creation and fun toys.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pre-bent circular dome metal sound-emitting spring, wherein the sound-emitting spring is a one-piece stamped shallow arch bistable metal sheet structure, wherein a circular arch, a corrugated flexible hinge band and an extension band are arranged sequentially from the inside to the outside, and the circular arch, the corrugated flexible hinge band and the extension band are smoothly connected as a whole. The circular arch is a convex arched spherical shell structure; The corrugated flexible hinge is disposed on the outside of the circular arch, with its inner side smoothly transitioning to the transverse central axis of the circular arch and its outer side smoothly transitioning to the outer extension band; the corrugated flexible hinge has an annular corrugated tooth structure. The epitaxial strip is a ring-shaped planar structure of uniform thickness, used for connection and fixation; In its initial state, the dome of the sound-generating spring protrudes to one side. Under the drive of an external force, it suddenly bounces and flips to the other side, vibrating violently to generate air shock waves and produce sound. When the external force is removed or reversed, the spring resets, flips, and vibrates to produce sound again.

[0007] Preferably, the circular arch is a spherical crown arch or a spherical shell structure.

[0008] Preferably, the diameter D of the circular arch is 20mm to 200mm, and the overall thickness t of the sound-generating spring is 0.1 to 0.3mm; The ratio of the diameter D of the circular arch to its height H is D:H = 1:0.1 to 0.13.

[0009] Preferably, the ratio of the diameter D of the circular arch to the width W of the corrugated flexible hinge is D:W = 1:0.07 to 0.19; The corrugated flexible hinge band has 16 to 24 teeth, and the corrugated groove depth is 0.3 mm to 0.45 mm.

[0010] Preferably, the sound-generating spring is made of spring steel 65Mn or phosphor bronze and is formed by molding and pre-bending a circular metal sheet.

[0011] Preferably, the fundamental frequency of the sound-emitting spring is inversely proportional to the square of the diameter D of the circular arch and directly proportional to the thickness t of the spring; when the diameter D of the circular arch is doubled, the fundamental frequency drops to 1 / 4 of the original, and when the thickness t of the spring is doubled, the fundamental frequency doubles, and the sound frequency coverage range is 150Hz to 5kHz.

[0012] The present invention also provides a sound generating device, including the pre-bent circular dome metal sound generating spring mentioned above, and also including a sound generating cavity shell, a pneumatic power pipe and a sound output horn; The sound-emitting cavity shell has a sound-emitting cavity inside. The two ends of the sound-emitting cavity shell are respectively provided with a first opening and a second opening. The first opening is connected to the compressed air power pipe, and the second opening is connected to the sound-emitting speaker. The sound-generating cavity is provided with at least one sound-generating spring, preferably a single piece, the sound-generating spring being located between the first opening and the second opening, and dividing the sound-generating cavity into a pressure chamber and a resonance chamber, the pressure chamber and the resonance chamber being airtight; The compressed air chamber is connected to the first opening, and the resonant chamber is connected to the second opening.

[0013] Preferably, the compressed air power pipe is provided with a power switching joint, which includes interchangeable blow-suction pipe joints and compressed air squeezing joints for switching inlet blow-suction power and compressed air squeezing power.

[0014] Preferably, at least two sound-emitting springs are assembled in the sound-emitting cavity, each sound-emitting spring is independently fixed to the inner wall of the sound-emitting cavity, and the sound-emitting springs are arranged in a mutually non-contacting manner and facing each other.

[0015] Preferably, the loudspeaker is a horn-type loudspeaker with a smooth inner wall and no sharp corners, with an inner diameter of 10mm and an outer diameter of 20mm to 30mm; the distance between the farthest point of the rebounding sound spring in the resonance cavity and the outer opening of the horn-type loudspeaker is 35mm to 40mm.

[0016] The present invention has the following beneficial effects: 1. This invention employs a large-sized pre-bent circular dome metal sound-generating spring, with the diameter D of the circular dome limited to 20mm to 200mm. The overall sound frequency covers 150Hz to 5kHz, entirely within the range sensitive to human hearing. Simultaneously, the large-sized structure provides the sound-generating spring with ample vibration radiation area, effectively enhancing sound loudness and sound propagation. The resulting sound volume is sufficient, making it well-suited for various applications such as entertainment, sports cheering, and fun educational toys, demonstrating exceptional adaptability and practicality.

[0017] 2. This invention innovatively adopts a shallow-arched, bistable, integrated structure. The sound-generating spring is a circular arch, corrugated flexible hinge, and extended strip integrally stamped structure. This structure boasts strong overall integrity, requires no complex processing equipment, and eliminates the need for multi-part assembly. The manufacturing process is simple, with low production costs and minimal difficulty in industrial mass production. The initial arch of the spring has a unidirectional convexity, which can achieve bidirectional spring-like jumping and flipping under external force. Both forward and reverse flips can independently generate vibration shock waves to produce sound, with differences in frequency, propagation direction, and sound intensity between the two flips. This creates a rhythmic, intermittent sound effect that traditional sound-generating structures cannot achieve, significantly improving sound recognition and enjoyment. Simultaneously, the added corrugated flexible hinge effectively reduces the driving power required for spring flipping, reducing driving energy consumption and improving structural response sensitivity. Combined with a switchable power switching connector, it is compatible with both manual blowing and sucking and manual ball-squeezing driving modes, making operation convenient and applicable to a wide range of scenarios, further enhancing the device's flexibility and adaptability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the side section structure of the sound-generating spring of the present invention; Figure 2 A side sectional view of the single-piece sound-generating spring-type sound-generating device provided by the present invention; Figure 3 A side sectional view of the dual-piece sound-generating spring-type sound-generating device provided by the present invention; Figure 4 A side sectional view of the four-piece sound-generating spring-type sound-generating device provided by the present invention; 1. Sound-generating spring; 11. Circular arch; 12. Corrugated flexible hinge band; 13. Extension band; 2. Sound-generating cavity shell; 21. Compressed air chamber; 22. Resonating chamber; 211. First opening; 221. Second opening; 3. Compressed air power pipe; 31. Blow-in / suck-out pipe connector; 32. Compressed air pinch ball connector; 4. Sound-emitting speaker. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, the present invention provides a pre-bent circular arch 11 topped with a metal sound-generating spring 1. The sound-generating spring 1 is a one-piece stamped shallow arch bistable metal sheet structure, which is formed by molding and pre-bending a circular metal sheet. The sound-generating spring 1 is arranged radially from the center outward with a circular arch 11, a corrugated flexible hinge band 12 and an extension band 13, which are smoothly connected to each other as a whole.

[0021] The circular arch 11 is a convex arched spherical shell structure, preferably a spherical crown arch or a standard spherical shell structure. It is the sound-generating area of ​​the spring piece, responsible for generating the basic shock wave sound source through flipping vibration. The dimensional parameters of the circular arch 11 are as follows: the diameter D ranges from 20mm to 200mm, the overall thickness t of the sound-generating spring piece 1 is 0.1 to 0.3mm, and the ratio of diameter D to arch height H is 1:0.1 to 0.13. This parameter ratio ensures that the spring piece has a stable bistable structure, while taking into account both flipping sensitivity and sound generation stability.

[0022] A corrugated flexible hinge band 12 is arranged in a ring around the outer side of the circular arch 11. Its inner side is tangentially and smoothly connected to the transverse central axis of the circular arch 11, and its outer side is integrated with the extension band 13. Its function is to reduce the driving force required for the spring to flip, buffer structural stress, assist in achieving bidirectional stable flipping, and improve the fatigue resistance of the spring. Its parameters are set as follows: the ratio of the diameter D of the circular arch 11 to the radial width W of the corrugated flexible hinge band 12 is 1:0.07 to 0.19, the number of corrugated teeth is 16 to 24, and the corrugated groove depth is controlled between 0.3 mm and 0.45 mm. At the same time, the top and bottom of the corrugated groove are rounded with a diameter of 0.06 mm to 0.14 mm, which can effectively eliminate stress concentration and significantly improve the fatigue life of the spring during reciprocating flipping.

[0023] The outer extension band 13 is a uniformly thick annular planar structure, which serves as the fixed installation part of the spring sheet and is used to connect and fix it to the cavity structure of the sound-generating device to ensure the stability and airtightness of the spring sheet after installation.

[0024] The preferred material for the sound-generating spring 1 is spring steel 65Mn or phosphor bronze. Both types of materials have the characteristics of moderate stiffness, excellent elasticity, high fatigue strength, and good sound resonance effect. They are also suitable for precision molding and shaping processes. After molding, the rebound amount is controllable and can stably maintain the preset shallow arch bistable structure.

[0025] This sound-generating spring 1 possesses bidirectional sound-generating characteristics. Initially, the arch bulges to one side. Under external force, it undergoes elastic deformation and stores strain energy. When the deformation reaches the maximum point of the structural potential energy curve, a sudden elastic jump occurs, causing the arch to flip to the other side and vibrate violently, generating air shock waves and producing sound. When the external force is removed or reversed, the spring resets, flips, and vibrates again, generating sound. The sound frequency, direction, and intensity differ between forward and reverse flipping, forming rhythmic intermittent sound generation.

[0026] The sound frequency emitted by the spring exhibits controllable regularity. The fundamental frequency is inversely proportional to the square of the diameter D of the circular arch 11 and directly proportional to the thickness t of the spring. Specifically, doubling the diameter of the circular arch 11 reduces the fundamental frequency to 1 / 4 of its original value; doubling the thickness of the spring doubles the fundamental frequency. The overall sound frequency covers a wide frequency range of 150Hz to 5kHz, which can adapt to different sound effect requirements.

[0027] like Figures 2 to 4 As shown, the present invention also provides a sound-generating device equipped with the above-mentioned sound-generating spring 1. The device comprises a sound-generating cavity shell 2, a compressed air power pipe 3, a sound-emitting horn 4, and a sound-generating spring 1. The overall structure is compact, easy to assemble, and has various power drives.

[0028] The sound-generating cavity shell 2 is the core load-bearing structure, with a closed sound-generating cavity inside. A first opening 211 and a second opening 221 are provided at both ends of the shell. The first opening 211 connects to the compressed air power pipe 3, serving as the power input channel; the second opening 221 connects to the fixed speaker 4, serving as the sound output channel. A single sound-generating spring 1 is installed inside the sound-generating cavity, horizontally positioned between the two openings, completely dividing the internal space of the cavity into an independent compressed air chamber 21 and a resonance chamber 22. The separation is maintained airtight throughout to prevent air pressure leakage from affecting the driving effect and sound generation efficiency. The compressed air chamber 21 receives the input power air pressure through the first opening 211; the resonance chamber 22 connects to the speaker 4 through the second opening 221, used for resonance amplification and outward propagation of sound effects.

[0029] The inner wall of the sound-generating cavity is pre-set with an annular mounting plate or spring plate mounting groove. The outer extension 13 of the sound-generating spring plate 1 is embedded in the mounting groove or abuts against the annular mounting plate. The outer extension 13 is pressed and fixed in the whole circumference by means of pressure ring, sealing rubber ring, adhesive, etc., which not only ensures that the spring plate is installed firmly without loosening or displacement, but also further enhances the airtight isolation effect between the air compression cavity 21 and the resonance cavity 22.

[0030] The power switching connector at the end of the compressed air power pipe 3 is a replaceable assembly structure, which includes two accessories: a blow-suction pipe connector 31 and a compressed air squeezing connector 32. It can be freely switched according to the usage scenario to realize two power modes: inhalation and suction drive and manual squeezing compressed air drive, to adapt to different usage needs.

[0031] For ease of operation and to keep the speaker 4 at a distance, the appropriate length of the pneumatic tube 3 is 10-30cm, and the inner diameter of the pneumatic tube 3 is 6-10mm. The speaker 4 adopts a horn-type structure with a smooth inner wall and no sharp corners, which can effectively reduce sound propagation loss and avoid noise interference. The speaker parameters are: inner diameter 10mm, outer diameter 20mm-30mm; inside the resonance cavity 22, the distance from the farthest point of the rebound of the sound-producing spring 1 to the outer opening of the speaker is controlled at 35mm-40mm. This distance can achieve the optimal resonance effect and maximize the improvement of sound clarity and loudness.

[0032] The sound-generating cavity shell 2 is a split structure that, when snapped together, forms a complete sealed cavity. It is made of metal or hard plastic, which is rigid and has minimal deformation, thus minimizing energy loss during the vibration of the spring and ensuring sound generation efficiency and sound effect stability.

[0033] The sound-generating principle of the device is as follows: In the initial state, the arch bulge of the sound-generating spring 1 protrudes to one side. When a driving force is applied in the opposite direction to the initial arch, the spring undergoes elastic deformation and stores strain energy. When the deformation reaches the maximum point of the structural potential energy curve (i.e., the critical state of sudden elastic transition), the spring undergoes a sudden elastic transition, jumping from one stable state to another, the arch flips to the other side, the stored strain energy is released and converted into kinetic energy, generating violent vibration and forming an air shock wave to produce sound, and then stabilizes in the reverse arch state. When the external force is removed or reversed, the spring resets and flips, vibrating and producing sound again. The sound frequency, direction, and intensity differ between forward and reverse flipping, forming rhythmic intermittent sound.

[0034] This sound-generating device can be flexibly adapted to single-piece, double-piece, and multi-piece sound-generating spring combinations according to sound effect requirements. Different arrangement methods can achieve different sound-generating effects.

[0035] Single-piece structure: A single sound-producing spring 1 is assembled inside the sound-producing cavity. The structure is simple and easy to assemble. The output sound effect is simple and pure, and it is suitable for basic fun sound-producing scenarios.

[0036] Multi-piece same diameter structure: The cavity is equipped with two or more sound-producing springs 1 of the same diameter. The multiple springs vibrate and resonate synchronously, which can realize superimposed sound production in a narrow frequency range and improve the loudness and layering of the sound effect.

[0037] Multi-diameter structure: The cavity is equipped with two or more sound-producing springs of different diameters 1. Different specifications of springs correspond to different sound frequencies, which can realize wide-band multi-dimensional sound production and greatly enrich the sound performance.

[0038] Preferred Embodiment 1 (Double-Piece Opposite Structure): Two sound-generating springs 1 are assembled inside the sound-generating cavity. Two sets of symmetrical, inclined annular pressing surfaces are provided on the inner wall of the cavity. The two springs are respectively clamped and fixed circumferentially by an extension band 13. The plane of the spring forms an inclined angle with the axis of the cavity. Two circular arches 11 are arranged in a mirror-symmetrical, opposite arrangement, maintaining a safe distance between the springs and preventing them from contacting each other. All the circular arch 11 areas of the springs are suspended without rigid support, ensuring bidirectional free rotation and vibration. This structure can achieve bidirectional alternating sound generation, resulting in a stronger sense of rhythm in the sound effect.

[0039] Preferred Embodiment Two (Four-Piece Surround Structure): Four sound-generating spring pieces 1 are evenly assembled inside the sound-generating cavity. Four inclined annular pressing surfaces are arranged around the inner wall of the cavity. The four spring pieces are arranged in pairs, inclined and opposite each other, with the two pairs of spring pieces evenly distributed at 90° intervals along the circumference of the cavity. Each spring piece is independently fixed and does not interfere with each other. The suspended dome can independently complete the sudden sound generation, and multi-frequency band synchronous sound generation results in rich sound layering and higher recognizability.

[0040] After the sound-generating device is assembled, the drive mode can be flexibly selected through the power switching connector. It mainly includes two basic modes: manual air compression drive and inhalation / blow-suction drive, and also supports mechanical automation drive expansion.

[0041] Assemble the power switching connector as a compressed air squeezing ball connector 32: When the user presses the compressed air squeezing ball, the high-pressure airflow enters the compressed air chamber 21 through the compressed air power pipe 3. The air pressure thrust drives the sound-generating spring 1 to undergo elastic deformation and store strain energy. When the deformation reaches the maximum point of the structural potential energy curve (i.e., the critical state of sudden elastic change), the spring undergoes sudden elastic change, jumping from one stable state to another. The arch flips to the other side, the stored strain energy is released and converted into kinetic energy, generating violent vibration and forming an air shock wave to produce sound, and then stabilizes in the reverse arched state.

[0042] When the user releases the squeeze, the air pressure in the air chamber 21 decreases, causing the spring to reset, flip, and vibrate again to produce sound. The frequency, direction, and intensity of the sound produced by forward and reverse flipping differ, creating a rhythmic, intermittent sound. By continuously pressing and releasing the squeeze, the spring can be cyclically flipped, producing continuous, intermittent sound. The sound effect is amplified by the resonance chamber 22 and stably emitted by the speaker 4.

[0043] Population blowing and sucking drive mode: Replace the blowing and sucking tube connector 31, and change the positive and negative pressure state inside the air chamber 21 by alternating manual blowing and sucking operations, drive the spring to rotate and vibrate in both directions, and achieve continuous sound. It is easy to operate and suitable for leisure use scenarios. Its sound generation mechanism is the same as the air squeezing ball drive mode, only the driving method is changed from pressing and squeezing the ball to blowing and sucking operation.

[0044] Mechanical drive extension mode: Adaptable to automated mechanical drive structures such as electric and electromagnetic actuators. An adaptable cutout is created in area 12 of the corrugated flexible hinge, allowing the actuator to pass through the cutout and directly act on the spring, driving the spring to reciprocate and rotate. This drive method offers high precision, good repeatability, and strong stability, making it suitable for automated applications requiring long-term, uninterrupted continuous sound generation.

[0045] The invention features a simple and reliable overall structural design. Its integrated stamping process is mature, resulting in low manufacturing costs, high production efficiency, and convenient assembly and maintenance, making it highly valuable for industrial application. The bistable spring structure is stable, highly fatigue-resistant, and unlikely to fail with long-term repetitive use, providing stable sound output, rich frequency range, and a strong sense of rhythm.

[0046] This device can be expanded with electroluminescent elements to achieve a sound and light linkage effect that synchronizes sound and light, creating a stronger atmosphere. It can be widely used as a support prop for entertainment and sports events to enhance the atmosphere and release emotions. At the same time, it can also be used as a fun and educational toy, suitable for children's hands-on training and the elderly's leisure and intellectual development. It combines fun and practicality, and has a wide range of market applications and strong promotion potential.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pre-bent circular dome metal sound-generating spring, characterized in that: The sound-generating spring is a one-piece stamped shallow arch bistable metal sheet structure, with a circular arch, a corrugated flexible hinge band and an extension band arranged sequentially from the inside to the outside. The circular arch, the corrugated flexible hinge band and the extension band are smoothly connected as a whole. The circular arch is a convex arched spherical shell structure; The corrugated flexible hinge band is disposed on the outside of the circular arch, with its inner side tangentially connected to the transverse central axis of the circular arch and its outer side connected to the extension band; the corrugated flexible hinge band has an annular corrugated tooth structure. The epitaxial strip is a ring-shaped planar structure of uniform thickness, used for connection and fixation; In its initial state, the dome of the sound-generating spring protrudes to one side. Under the drive of an external force, it suddenly bounces and flips to the other side, vibrating violently to generate air shock waves and produce sound. When the external force is removed or reversed, the spring resets, flips, and vibrates to produce sound again.

2. The pre-bent circular dome metal sound-generating spring according to claim 1, characterized in that: The circular arch is a spherical crown arch.

3. The pre-bent circular dome metal sound-generating spring according to claim 1 or 2, characterized in that: The diameter D of the circular arch is 20mm to 200mm, and the overall thickness t of the sound-generating spring is 0.1 to 0.3mm; The ratio of the diameter D of the circular arch to its height H is D:H = 1:0.1 to 0.

13.

4. The pre-bent circular dome metal sound-generating spring according to claim 1, characterized in that: The ratio of the diameter D of the circular arch to the width W of the corrugated flexible hinge is D:W = 1:0.07 to 0.19; The corrugated flexible hinge band has 16 to 24 teeth, and the corrugated groove depth is 0.3 mm to 0.45 mm.

5. The pre-bent circular dome metal sound-generating spring according to claim 1, characterized in that: The sound-generating spring is made of spring steel 65Mn or phosphor bronze and is formed by molding and pre-bending a circular metal sheet.

6. The pre-bent circular dome metal sound-generating spring according to claim 1, characterized in that: The fundamental frequency of the sound-generating spring is inversely proportional to the square of the diameter D of the circular arch and directly proportional to the thickness t of the spring. When the diameter D of the circular arch is doubled, the fundamental frequency drops to 1 / 4 of the original value. When the thickness t of the spring is doubled, the fundamental frequency doubles. The sound frequency coverage range is 150Hz to 5kHz.

7. A sound-generating device, comprising the pre-bent circular dome metal sound-generating spring according to any one of claims 1-6, characterized in that: It also includes the sound-generating cavity shell, the compressed air power pipe, and the sound-emitting speaker; The sound-emitting cavity shell has a sound-emitting cavity inside. The two ends of the sound-emitting cavity shell are respectively provided with a first opening and a second opening. The first opening is connected to the compressed air power pipe, and the second opening is connected to the sound-emitting speaker. The sound-generating cavity is provided with one or more sound-generating springs, which are located between the first opening and the second opening, and divide the sound-generating cavity into a pressure chamber and a resonance chamber. The pressure chamber and the resonance chamber are airtight. The compressed air chamber is connected to the first opening, and the resonant chamber is connected to the second opening.

8. The sound-generating device according to claim 7, characterized in that: The compressed air power pipe is equipped with a power switching connector, which includes interchangeable blow-suction pipe connectors and compressed air squeezing connectors, used to switch between inlet blow-suction power and compressed air squeezing power.

9. The sound-generating device according to claim 7, characterized in that: The sound-emitting cavity is equipped with at least two sound-emitting springs, each of which is independently fixed to the inner wall of the sound-emitting cavity. The sound-emitting springs do not contact each other and are arranged in a facing manner.

10. The sound-generating device according to claim 7, characterized in that: The loudspeaker is a horn-type loudspeaker with a smooth inner wall and no sharp corners. Its inner diameter is 10mm and its outer diameter is 20mm to 30mm. The distance between the farthest point of the sound-producing spring in the resonance cavity and the outer opening of the horn-type loudspeaker is 35mm to 40mm.

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