Harmonica tone improvement device based on resonance cavity adjustment

Abstract

The invention provides a harmonica tone improvement device based on resonance cavity adjustment, and relates to the technical field of harmonica accessories. The device comprises an adapter ring, a resonance box, a first partition plate and a replaceable second partition plate, the adapter ring and the resonance box are integrally formed, the adapter ring comprises an arc ring body and a square ring body, the adapter ring can be matched with a mainstream arc-shaped or square harmonica, and the original structure of the harmonica does not need to be changed; the resonance box is of a semi-enclosed arc structure with an opening in one side, the interior of the resonance box is matched with a longitudinal sliding groove through a partition lifting handle, vertical swing adjustment of a first partition is achieved, and then the effective space size of a resonance cavity is changed. By replacing the first partition plate with the annular opening and the second partition plate without the opening, the basic tone can be switched. The device can amplify the volume of the harmonica, enrich overtone levels, realize fine adjustment and basic switching of timbre, remarkably improve expressive force of the harmonica in solo, band accompaniment, outdoor playing and other scenes, and is convenient to mount and dismount and high in durability.

Description

Technical Field

[0001] This invention belongs to the field of harmonica accessories technology, and more specifically, relates to a harmonica tone improvement device based on resonance cavity adjustment. Background Technology

[0002] The harmonica is a small wind instrument made of metal or plastic. It produces sound by blowing or inhaling air to drive the internal reeds to vibrate. With its crisp and bright tone and portability, it is widely used for solo or accompaniment in various styles of music such as blues, folk, and rock. It is a popular and widely loved instrument.

[0003] In the field of musical instrument acoustics, compared to stringed instruments such as the violin and classical guitar, the harmonica's structural defects are particularly prominent. Stringed instruments are equipped with carefully designed resonator boxes. For example, the violin's top, back, and sides form a resonating cavity that amplifies the energy of string vibrations and radiates rich overtones, resulting in a full and layered tone. The classical guitar, through optimizing the shape, material, and internal support of its resonator box, endows the music with a warm and mellow quality. However, the harmonica's structure consists only of a reed, a seat, and a cover plate, lacking a dedicated resonating structure. The sound produced by the reed's vibration is directly radiated into the air through the cover plate without sufficient amplification and modification, resulting in a relatively thin tone, low volume, and poor sound propagation directionality. It is difficult to achieve ideal performance effects when expressing grand and profound musical emotions or in noisy environments or band ensembles. This lack of resonance has become a key bottleneck limiting the harmonica's tonal expressiveness and the expansion of its application scenarios. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a harmonica tone improvement device based on resonance cavity adjustment. This device solves the technical problems of existing harmonicas, which suffer from thin tone, low volume, poor sound propagation directionality, insufficient expressiveness, and limited application scenarios due to the lack of a dedicated resonance structure, making it difficult to meet diverse performance needs.

[0005] A harmonica tone improvement device based on resonance chamber adjustment includes an adapter ring, a resonance chamber fixedly connected to the top of the adapter ring, a first partition slidably connected inside the resonance chamber, and the adapter ring and the resonance chamber are integrally molded.

[0006] Preferably, the adapter ring includes an arc-shaped ring body and a square ring body, with the square ring body fixedly connected inside the arc-shaped ring body.

[0007] Preferably, the square ring is lower than the arc-shaped ring, the arc-shaped ring has a boat-shaped structure that is wider at the top and narrower at the bottom, the bottom of the arc-shaped ring is open, and the entire adapter ring is hollow.

[0008] Preferably, the resonating chamber includes a main body and a longitudinal groove, the longitudinal groove being formed through the main body of the chamber.

[0009] Preferably, the main body of the box has a semi-enclosed design with an opening on one side, and the other side of the main body of the box has an arc-shaped structure, with the longitudinal groove opened on the other side of the main body of the box.

[0010] Preferably, the first partition includes a partition handle, a partition body, a rotating rod, and an annular opening. The partition body is fixedly connected to one end of the partition handle, and the partition body is rotatably connected to the top end of the arc-shaped ring through the rotating rod. The annular opening is formed on the surface of the partition body.

[0011] Preferably, the partition handle extends through the longitudinal slide groove and can slide within the longitudinal slide groove to achieve the up-and-down swing adjustment of the first partition within the resonating chamber.

[0012] Preferably, the first partition can be replaced by a second partition, the structure of which is the same as that of the first partition, and the surface of the second partition does not have an annular opening.

[0013] Preferably, the arc-shaped ring is adapted to a harmonica with an arc-shaped structure, and the square ring is adapted to a harmonica with a square structure, thereby achieving a fixed connection between the device and the harmonica through the arc-shaped ring or the square ring.

[0014] Preferably, the arc-shaped structure of the main body of the box is used to collect the sound waves generated when the harmonica is playing, so as to enhance the reflection and resonance effect of the sound waves in the resonance box.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] Highly adaptable, requiring no modification to the harmonica structure: The adapter ring adopts an integrated design of curved and square rings, which can be directly adapted to mainstream curved and square harmonicas on the market. There is no need to modify the original harmonica by drilling, gluing or other modifications, perfectly preserving the original performance and appearance of the harmonica. Moreover, it is easy to install and disassemble, and can be operated by a single person with bare hands, making it widely applicable.

[0017] The tone adjustment is flexible and versatile, meeting diverse performance needs: On the one hand, by adjusting the position of the first partition in the resonance chamber by sliding the partition handle, the effective volume of the resonance chamber can be precisely changed, thereby adjusting the resonance frequency and achieving a delicate switch of tone from bright and transparent to rich and deep, easily finding the best resonance point for the harmonica; on the other hand, by replacing the first partition (with a ring opening, transparent and layered tone) with the second partition (without a ring opening, full and heavy tone), the basic tone can be quickly switched to adapt to the performance needs of different styles of music.

[0018] Significantly improved acoustic performance and richer musical expression: The arc-shaped semi-enclosed structure of the resonance box can collect the sound waves scattered by the harmonica from all directions, reducing energy loss. At the same time, it generates rich overtones through multiple reflections and resonances, making the originally thin harmonica tone more three-dimensional and full. In addition, the resonance box can also amplify the volume, optimize the directionality of sound propagation, and extend the sound decay time, making the music more coherent and smooth. This not only enhances the emotional appeal of solo performances, but also ensures that the sound is clear and distinguishable in band ensembles, outdoor performances, and other scenarios, and enhances the integration with other instruments.

[0019] The structure is simple, reliable, and highly practical: the device adopts an integrated molding design and modular component combination, with mature processing technology and material selection that takes into account both acoustic performance and durability (such as ABS plastic, solid wood, stainless steel, etc.), making it less prone to damage during long-term use; the baffle adjustment is achieved through damping bearings, which can fix the position without additional locking structure, and the operation is smooth and without jamming. Moreover, the two baffle structures have the same size, and replacement does not require adjustment of the installation structure, making it convenient and efficient.

[0020] Expanding application scenarios and enhancing the value of harmonicas: By amplifying volume, optimizing timbre, and improving propagation, this device enables harmonicas to not only meet the needs of solo performances in small daily settings, but also adapt to more scenarios such as band accompaniment, outdoor performances, and classical music interpretation. It breaks through the application limitations of traditional harmonicas and significantly enhances their value and performance capabilities. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the main body of the box and the longitudinal sliding groove in this invention;

[0023] Figure 3 This is a schematic diagram of the structure of the arc-shaped ring and the square ring in this invention;

[0024] Figure 4 This is a structural schematic diagram of the partition handle and the partition body in this invention;

[0025] Figure 5 This is a schematic diagram of the structure of the second partition in this invention.

[0026] In the figure, the correspondence between the component names and the attached drawing numbers is as follows: 1. Adapter ring; 2. Resonance box; 3. First partition; 4. Second partition; 11. Arc-shaped ring; 12. Square ring; 21. Box body; 22. Longitudinal slide; 31. Partition handle; 32. Partition body; 33. Rotating rod; 34. Annular opening. Detailed Implementation

[0027] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0028] Please see Figure 1-5 This invention provides a harmonica tone improvement device based on resonance cavity adjustment. To ensure the acoustic performance, adaptability, and durability of the device, the material selection and processing precision of each core component must meet the following requirements:

[0029] Adapter ring 1:

[0030] ABS engineering plastic or lightweight aluminum alloy can be selected; ABS plastic has good injection molding properties, toughness and wear resistance, and is lightweight, so it will not increase the burden of carrying the harmonica; lightweight aluminum alloy has higher strength and better acoustic conductivity, and can be selected according to the user's needs for weight and tone.

[0031] The arc-shaped ring 11 and the square ring 12 are formed by one-piece injection molding (plastic material) or one-piece casting (aluminum alloy material) to ensure connection strength and avoid assembly gaps affecting resonance effect;

[0032] The arc-shaped ring 11 is manufactured strictly according to the ship-shaped structure that is wider at the top and narrower at the bottom. The diameter of the upper port is larger than that of the lower port, and the inner side wall is smoothed so that there are no burrs when it is attached to the surface of the harmonica.

[0033] The square ring 12 is fixed at the center of the arc ring 11. Its height is lower than that of the arc ring 11, forming a stepped fitting structure. The inner side length of the square ring 12 is adapted to the cross-sectional dimensions of the mainstream square harmonicas on the market (usually 18-22mm). The inner arc radius of the arc ring 11 is adapted to the outer arc of the mainstream arc harmonicas.

[0034] The adapter ring 1 is hollow, and the cross-sectional area of ​​the hollow channel is not less than the total cross-sectional area of ​​the harmonica's sound holes, ensuring that the sound waves when the harmonica is playing can enter the resonance box 2 without obstruction.

[0035] Resonance Box 2:

[0036] The main body 21 of the enclosure is made of solid wood (such as maple or peach wood) or composite acoustic board with excellent acoustic properties; solid wood can enhance sound wave reflection and resonance, making the tone warm and mellow; composite acoustic board is lower in cost and more stable, and is suitable for popular applications; the longitudinal groove 22 is integrally processed with the main body 21 of the enclosure.

[0037] The main body 21 of the box has a semi-enclosed design with an opening on one side. The size of the opening side is perfectly matched with the size of the top of the adapter ring 1. It is fixed to the adapter ring 1 by welding (metal material) or gluing (wood / plastic material).

[0038] The other side of the main body 21 of the enclosure is an arc-shaped structure with a radius of curvature of 30-40mm, which ensures that the sound waves are uniformly reflected inside the enclosure and avoids sound wave cancellation.

[0039] The longitudinal groove 22 is opened through the arc-shaped side of the main body 21 of the box. The width of the groove is larger than the diameter of the partition handle 31 to ensure that the handle slides smoothly without excessive gaps. The length of the groove is 2 / 3 of the height of the main body 21 of the box, which limits the adjustment range of the partition.

[0040] First partition 3 and second partition 4:

[0041] The partition body 32 is made of ABS plastic, lightweight wood or acrylic board; plastic material is easy to process and low cost, wood material can optimize tone resonance, and acrylic board has high transparency, making it easy to observe the sound wave conduction state inside the box.

[0042] The main body 32 of the first partition 3 is circular or square (matching the internal cross-sectional shape of the box body 21), with a thickness of 2-3mm. An annular opening 34 is opened on the surface. The inner diameter of the annular opening 34 is 1 / 2 of the diameter of the main body 32 of the partition, and the outer diameter is 3 / 4 of the diameter of the main body 32 of the partition. The edges of the opening are rounded to reduce airflow resistance.

[0043] The partition handle 31 is a cylindrical structure with a diameter of 5-8mm and a length that extends 3-5mm beyond the outer side of the longitudinal groove 22, making it easy for users to grip and adjust. The handle is integrally formed with the partition body 32.

[0044] The rotating rod 33 is made of stainless steel with a diameter of 2-3mm. It runs through both sides of the partition body 32 and is rotatably connected to the pre-reserved mounting holes at the top of the arc-shaped ring 11 at both ends. Miniature damping bearings can be embedded in the mounting holes to make the partition swing smoothly without jamming and can be fixed in any adjustable position.

[0045] The structure and dimensions of the second partition 4 are completely identical to those of the first partition 3, except that the surface does not have an annular opening 34, ensuring that the installation structure does not need to be adjusted during replacement and can be directly adapted to the resonating box 2.

[0046] Overall assembly process of the device:

[0047] (a) Preprocessing:

[0048] Clean all processed parts to remove surface burrs, dust and oil, and ensure that the assembly surfaces fit tightly.

[0049] Check the fit between the rotating rod 33 and the miniature damping bearing. Apply a small amount of silicone oil (or other acoustically friendly lubricant) to the inside of the bearing to ensure smooth rotation without additional noise.

[0050] (II) Assembly:

[0051] Fixing the adapter ring 1 to the resonator box 2: Since the adapter ring 1 and the resonator box 2 are integrally molded, if plastic material is used, it is processed into shape in one piece through injection molding; if metal material is used, it is integrally molded through casting; if the resonator box 2 is made of wood and the plastic adapter ring 1 is combined, apply a special adhesive (such as wood glue, AB glue) to the connecting surface at the top of the adapter ring 1 and the connecting surface on the opening side of the resonator box 2, align them and fix them with clamps, let them stand for 24 hours to allow the adhesive to fully cure, and ensure that there are no gaps or looseness at the connection.

[0052] Installation of partitions:

[0053] Align the two ends of the rotating rod 33 of the first partition 3 with the reserved mounting holes at the top of the arc-shaped ring 11, and slowly insert it into the holes to ensure that the rotating rod 33 is fully in contact with the bearing, so that the partition body 32 can swing freely inside the resonance box 2.

[0054] Pass the partition handle 31 through the longitudinal groove 22 of the body 21 and adjust the position of the handle so that when the body 32 of the partition is in the middle position of the resonating box 2, the handle is located at the midpoint of the groove, ensuring that the adjustment stroke is uniform.

[0055] Post-assembly inspection:

[0056] Slide the partition handle 31 to check whether the swing angle of the first partition 3 is smooth and whether the adjustment range covers the entire length of the longitudinal slide groove 22, without jamming or loosening;

[0057] Insert the compatible harmonica into the arc-shaped ring 11 or square ring 12 of the adapter ring 1, check the fit between the harmonica and the ring, and ensure that it is firmly fixed without any wobbling.

[0058] Play the harmonica and listen for any unusual noises inside the resonator 2 (such as loose parts or air leakage). If any unusual noises are heard, the assembly gaps need to be rechecked and adjusted.

[0059] Installation and disassembly of the device and harmonica:

[0060] (a) Installation procedure:

[0061] Harmonica type compatibility: Select the appropriate ring body according to the shape and structure of the harmonica: If the harmonica has an arc-shaped shell (such as some blues harmonicas), select the arc-shaped ring body 11 of adapter ring 1; if the harmonica has a square shell (such as diatonic harmonicas and chromatic harmonicas), select the square ring body 12.

[0062] Fixed installation:

[0063] Hold the device and align the bottom opening of the adapter ring 1 with the sounding end of the harmonica (the end closest to the reed), and slowly slide it in so that the sounding hole area of ​​the harmonica is completely aligned with the hollow channel of the adapter ring 1, ensuring that the sound waves can be directly transmitted to the resonating box 2.

[0064] Since the arc-shaped ring 11 of the adapter ring 1 has a boat-shaped structure that is wider at the top and narrower at the bottom, after it is put on the harmonica, the inner wall of the ring will fit tightly against the harmonica shell, and the elastic tension of the material will be used to fix it. If the harmonica is slightly smaller, a thin silicone pad (1-2mm thick) can be pasted on the inner side of the ring to increase friction and prevent loosening.

[0065] (II) Disassembly Operation:

[0066] Hold the non-sounding end of the harmonica and gently apply outward force to separate the harmonica from the arc-shaped ring 11 or square ring 12 of the adapter ring 1;

[0067] Avoid using excessive force during disassembly to prevent damage to the harmonica shell or the adapter ring structure of the device.

[0068] Specific steps for tone adjustment and partition replacement:

[0069] (a) Adjustment of the resonating cavity space:

[0070] Adjustment principle: By changing the position of the first partition 3 inside the resonance box 2, the effective internal space volume of the resonance box 2 is adjusted, thereby changing the reflection path and resonance frequency of the sound waves inside the box, finding the best resonance point of the harmonica, and achieving delicate adjustment of the tone.

[0071] Operating steps:

[0072] The performer holds the harmonica with the device assembled, pinching the partition handle 31 with the index or middle finger;

[0073] The handle can be slid up and down according to the performance requirements: when sliding up, the partition body 32 swings upward, the effective space volume of the resonance box 2 increases, the resonance frequency decreases, and the tone becomes richer and deeper, which is suitable for playing long and lyrical phrases; when sliding down, the partition body 32 swings downward, the effective space volume decreases, the resonance frequency increases, and the tone becomes brighter and clearer, which is suitable for playing light and lively melodies.

[0074] During the adjustment process, continue playing the harmonica and listen to the changes in tone until you find the best resonance position that meets your needs. Since the rotating rod 33 is equipped with a damping bearing, the partition will be fixed in the current position after the handle is released, without the need for an additional locking structure.

[0075] (II) Partition replacement operation (changing the basic tone):

[0076] Replacement principle: The annular opening 34 of the first partition 3 allows some sound waves to pass directly through, reducing airflow resistance and making the tone more transparent and layered; the second partition 4 has no annular opening 34, so the sound waves are reflected more fully in the box, making the tone fuller and thicker. By replacing the two partitions, the basic tone can be switched.

[0077] Operating steps:

[0078] To remove the existing partition: Gently pinch the partition handle 31, swing the partition body 32 to a horizontal position, and then pull one end of the rotating rod 33 outward to disengage the rotating rod 33 from the mounting hole of the arc-shaped ring 11, and then remove the partition.

[0079] Install the target partition: Align the two ends of the rotating rod 33 of the second partition 4 with the mounting holes, insert it slowly, and after ensuring that it is installed in place, swing the partition handle 31 to check the smoothness of sliding.

[0080] After the replacement is completed, play the harmonica to verify the tone, and further adjust the position of the partition as needed to optimize the resonance effect.

[0081] The adaptation and fixing functions of adapter ring 1:

[0082] The integrated design of the arc-shaped ring 11 and the square ring 12 allows for compatibility with mainstream arc-shaped and square harmonicas on the market without the need to replace adapter parts. Furthermore, it eliminates the need for drilling, gluing, or other modifications to the original harmonica, perfectly preserving its original structure and performance. The hollow design ensures that the sound waves from the harmonica are transmitted unimpeded to the resonance box 2, avoiding sound wave loss.

[0083] Acoustic enhancement function of Resonance Box 2:

[0084] The arc-shaped structure of the main body 21 can collect scattered sound waves from all directions when the harmonica is playing, reducing the loss of sound waves as they spread outwards; the sound waves are reflected more evenly on the arc-shaped inner wall, forming multiple resonances and producing rich overtones, making the originally thin harmonica tone more three-dimensional and full; the semi-enclosed design not only ensures the sound wave collection effect, but also does not excessively block the harmonica's sound holes, ensuring the flow of breath during performance.

[0085] Baffle adjustment and switching functions:

[0086] The partition body 32 is rotatably connected to the adapter ring 1 via the rotating rod 33, which is simple in structure and highly reliable. The longitudinal slide groove 22 limits the adjustment range and avoids excessive swing of the partition, which could lead to structural interference. The structural consistency of the two partitions ensures convenient replacement. No additional tools are required, and the operation can be completed by hand.

[0087] Scenario-based applications:

[0088] (a) Solo performance scenarios (such as folk solos, classical solos):

[0089] A wooden resonator 2 + first partition 3 is selected, suitable for square diatonic harmonicas;

[0090] Slide the partition handle 31 upwards to 1 / 3 of its travel. The effective space of the resonance box 2 is large, and the tone is rich and layered.

[0091] When playing lyrical phrases, adjust the partition upwards to enhance the depth of the tone; when playing melodies in the high register, adjust the partition downwards to increase the brightness of the tone and ensure the melody is clear and prominent.

[0092] (ii) Band accompaniment scenes (such as pop bands, jazz bands):

[0093] It uses an aluminum alloy resonator 2 + second partition 4, which is suitable for curved blues harmonicas;

[0094] When the partition handle 31 is adjusted to the middle position, the tone is full and the volume is sufficient, which can be perfectly integrated with instruments such as guitar and bass.

[0095] When playing rhythmic accompaniment, slide the handle down to enhance the projection of the tone and ensure it is not masked by other instruments in a band ensemble.

[0096] (III) Outdoor performance scenarios:

[0097] The device is made of lightweight ABS plastic (total weight ≤100g), making it easy to carry;

[0098] Install the second partition 4 and adjust its position upwards to increase the effective space of the resonance box 2, thereby increasing the volume and sound propagation distance, ensuring the performance effect even in noisy environments.

[0099] Maintenance and care:

[0100] Cleaning: Wipe the surface of the device with a soft cloth to remove dust and stains. Avoid using corrosive solvents such as alcohol and acetone to prevent damage to the materials. Regularly clean the debris in the longitudinal slide groove 22 to ensure that the partition slides smoothly.

[0101] Storage: When not in use, separate the device from the harmonica and store it in a dry, well-ventilated environment to prevent moisture from causing the wooden parts to warp and the metal parts to rust.

[0102] Maintenance: Regularly check the damping effect of the rotating rod 33. If it is stuck or loose, add a small amount of silicone oil. If the component is damaged, the corresponding partition or individual component of the adapter ring 1 and resonator box 2 can be directly replaced without replacing the entire device.

[0103] Through this specific embodiment, those skilled in the art can accurately manufacture and assemble the device of the present invention, and flexibly adjust the resonance cavity space and replace the partition according to different performance scenarios and needs, so as to achieve diversified optimization of the harmonica timbre and significantly improve the performance performance and applicability of the harmonica.

[0104] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A harmonica tone improvement device based on resonance cavity adjustment, characterized in that: It includes a transition ring (1), the top of which is fixedly connected to a resonance box (2), and the inside of the resonance box (2) is slidably connected to a first partition (3). The transition ring (1) and the resonance box (2) are integrally formed.

2. The harmonica tone improvement device based on resonance cavity adjustment according to claim 1, characterized in that: The adapter ring (1) includes an arc-shaped ring (11) and a square ring (12), with the square ring (12) fixedly connected inside the arc-shaped ring (11).

3. The harmonica tone improvement device based on resonance cavity adjustment according to claim 2, characterized in that: The square ring (12) is lower than the arc-shaped ring (11). The arc-shaped ring (11) has a boat-shaped structure that is wider at the top and narrower at the bottom. The bottom of the arc-shaped ring (11) is open. The entire transition ring (1) is hollow.

4. The harmonica tone improvement device based on resonance cavity adjustment according to claim 3, characterized in that: The resonance box (2) includes a main body (21) and a longitudinal groove (22), which is opened through the main body (21).

5. The harmonica tone improvement device based on resonance cavity adjustment according to claim 4, characterized in that: The main body of the box (21) is a semi-enclosed design with an opening on one side, and the other side of the main body of the box (21) is an arc-shaped structure. The longitudinal groove (22) is opened on the other side of the main body of the box (21).

6. The harmonica tone improvement device based on resonance cavity adjustment according to claim 5, characterized in that: The first partition (3) includes a partition handle (31), a partition body (32), a rotating rod (33), and an annular opening (34). The partition body (32) is fixedly connected to one end of the partition handle (31). The partition body (32) is rotatably connected to the top of the arc-shaped ring (11) through the rotating rod (33). The annular opening (34) is opened on the surface of the partition body (32).

7. The harmonica tone improvement device based on resonance cavity adjustment according to claim 6, characterized in that: The partition handle (31) passes through the longitudinal groove (22) and can slide within the longitudinal groove (22) to achieve the up-and-down swing adjustment of the first partition (3) within the resonance box (2).

8. The harmonica tone improvement device based on resonance cavity adjustment according to claim 1, characterized in that: The first partition (3) can be replaced by the second partition (4). The structure of the second partition (4) is the same as that of the first partition (3), and the surface of the second partition (4) does not have an annular opening (34).

9. A harmonica tone improvement device based on resonance cavity adjustment according to claim 2, characterized in that: The arc-shaped ring (11) is adapted to the arc-shaped harmonica, and the square ring (12) is adapted to the square-shaped harmonica. The device and the harmonica are fixedly connected through the arc-shaped ring (11) or the square ring (12).

10. A harmonica tone improvement device based on resonance cavity adjustment according to claim 5, characterized in that: The arc-shaped structure of the main body (21) of the box collects the sound waves generated when the harmonica is played.

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