A skin tensioning device for processing a two-stringed Chinese violin tube

Abstract

The application relates to the technical field of erhu tube skin processing, and discloses a skin tensioning device for erhu tube processing, which comprises a bottom plate, a stand column arranged at the top of the bottom plate, a supporting plate arranged at the top of the stand column, an erhu tube body arranged at the top of the supporting plate, a U-shaped frame arranged at the top of the bottom plate, and a tensioning component arranged on the supporting plate. The tensioning component comprises a tensioning assembly arranged on the supporting plate, a rotating assembly, an extension assembly, a sliding limiting assembly and a positioning assembly arranged on the tensioning assembly. The skin can be tightly pressed on the top of the erhu tube body through the electric push rod on the U-shaped frame to drive the lower pressing plate to move downwards, and the skin has no displacement when the rope is subsequently sleeved; the adjusting assembly is assisted by the reaction force of the adjusting spring to accurately correspond the skin edge and the bottom block. Finally, the skin center is completely coincident with the center of the erhu tube resonance cavity, the acoustic dead angle caused by the misplacement of the skin is eliminated, the erhu tone is guaranteed to be pure from the source, and the noise and the pitch deviation are reduced.

Description

Technical Field

[0001] This invention relates to the field of instrument body skinning technology, and in particular to a skinning tensioning device for processing erhu instrument bodies. Background Technology

[0002] The skinning process is the core step in the manufacturing of the erhu's soundbox, directly determining the instrument's tonal characteristics and acoustic performance. As the erhu's core sound-producing body, the skin transmits the vibrations of the bow through the soundbox, creating a unique timbre. Its thickness, tension, and vibration conductivity are crucial for tone control. Traditionally, the skin from the belly of an adult python is considered the best material, requiring clear grain and uniform thickness; too thick a skin results in a muffled sound, while too thin a skin produces a harsh tone. The process involves soaking and softening, precise stretching, and fixing with fish glue, repeatedly adjusting the tension to balance brightness and richness, and combining it with soundbox woods such as rosewood and sandalwood to achieve resonance compatibility. When skinning the erhu's soundbox, skinning tools are needed. However, existing skinning tools have the following drawbacks: In the traditional erhu soundboard covering process, significant operational defects exist in the rope application and tension control stages, directly affecting the quality of the covering and the final tone of the instrument. Firstly, during the initial fixing stage, flexible ropes must be evenly applied along the edge of the covering to achieve subsequent tensioning and positioning. However, due to the thinness and weak edge toughness of the covering, manual application of force during rope application is prone to deviation. Slight carelessness can lead to misalignment between the covering and the soundboard end, resulting in minor overlap at the edges or, in severe cases, misalignment between the center of the covering and the center of the soundboard resonance cavity, creating a "misaligned" problem. This misalignment disrupts the resonance matching between the membrane and the soundboard, creating acoustic dead zones during bow vibration transmission, ultimately resulting in a muffled tone, increased noise, and even pitch deviation, severely impacting the performance. Secondly, during the skin tensioning stage, ropes must be pulled synchronously in symmetrical directions to ensure even tension on the membrane and achieve the preset tension. However, current manual operation relies on workers' experience and judgment, lacking a standardized force control mechanism. On the one hand, workers find it difficult to accurately control the tension of the ropes on both sides, easily resulting in excessive tension on one side and insufficient tension on the other. On the other hand, even if the initial force is consistent, differences in the elastic deformation of the ropes during the pulling process and instantaneous fluctuations in the force applied by the hand can lead to asynchronous force on the ropes in symmetrical directions. This tension imbalance causes uneven local tension of the membrane, forming "tight and loose zones." Tight areas vibrate at excessively high frequencies, producing a sharp and piercing sound; loose areas vibrate slowly, producing a dull and weak sound, further exacerbating the problem of tone imbalance. Moreover, this is difficult to repair through later adjustments, becoming a key bottleneck restricting the stability of the erhu's quality. Summary of the Invention

[0003] Given that existing technologies are prone to misalignment between the skin and the soundbox during manual operation, which disrupts resonance matching and leads to poor tone and pitch deviation, and that tensioning relies on manual experience without standardized control, making it difficult to synchronize the tension of the rope and causing imbalances in the skin tension, resulting in loose and tight zones that exacerbate tone imbalances and are difficult to repair, a skin tensioning device for erhu soundbox processing is proposed.

[0004] This application provides a skin tensioning device for processing the soundbox of an erhu, the purpose of which is to: avoid alignment misalignment during skinning, ensure resonance matching between the skin and the soundbox; achieve symmetrical rope synchronous force, prevent skin tension imbalance, avoid slack and tight zones, ensure stable tone and reduce repair difficulty.

[0005] The technical solution of the present invention is as follows: a skin tensioning device for processing the body of an erhu, comprising a base plate, a column at the top of the base plate, a support plate at the top of the column, the body of the erhu at the top of the support plate, a U-shaped frame at the top of the base plate, and a tensioning component disposed on the support plate. The tensioning component includes a tensioning assembly mounted on the support plate, and the tensioning assembly is provided with a rotating assembly, a telescopic assembly, a sliding limiting assembly, and a positioning assembly. The tensioning component is used to simultaneously tension the edges of the skin; The tensioning assembly includes multiple base blocks arranged in a circular array on a support plate. Each base block has a sleeve, an inner rod is provided inside the sleeve, and a rope is provided at the top of the inner rod.

[0006] Furthermore, the rotating assembly includes an arc-shaped groove on the sleeve, and a vertical groove communicating with the arc-shaped groove is also provided on the sleeve. A guide block is provided on the inner side of both the arc-shaped groove and the vertical groove, and the guide block is fixedly connected to the bottom block.

[0007] Furthermore, the telescopic assembly includes a telescopic plate disposed inside the sleeve, the telescopic plate being fixedly connected to the inner rod, and a telescopic spring being disposed between the telescopic plate and the sleeve.

[0008] Furthermore, the sliding limiting assembly includes a rotating rod disposed inside the sleeve, the rotating rod being disposed inside the telescopic spring, the telescopic plate being slidably connected to the rotating rod, a plurality of limiting holes being symmetrically distributed on the rotating rod, and a vertical hole communicating with the plurality of limiting holes being disposed on the rotating rod, the same limiting block being disposed inside the vertical hole and the plurality of limiting holes, and an inclined surface being disposed on the limiting block.

[0009] Furthermore, the positioning component includes a positioning rod disposed on the rotating rod, a positioning ring disposed on the positioning rod, and the positioning ring being fixedly connected to the limiting block.

[0010] Furthermore, the tensioning component also includes a support assembly mounted on the column, and an adjustment assembly is provided on the support plate; The support assembly includes a threaded ring mounted on a column, a connecting ring mounted on the threaded ring, and multiple fixing plates arranged in a circular array on the connecting ring. Each fixing plate is equipped with a slider, which is rotatably connected to a corresponding sleeve. A positioning rod passes through the sleeve and is fixedly connected to the slider.

[0011] Furthermore, the adjustment component includes grooves arranged in a ring array on the support plate, an adjustment rod is provided inside the groove, an adjustment spring is provided between the adjustment rod and the inside of the groove, and the adjustment rod is fixedly connected to the corresponding bottom block.

[0012] Furthermore, it also includes a pressing assembly mounted on the U-shaped frame, the pressing assembly including an electric actuator mounted on the U-shaped frame, the output end of the electric actuator passing through the U-shaped frame and having a pressing plate.

[0013] The beneficial effects of this invention are: The lower pressure plate is driven downward by the electric actuator on the U-shaped frame, firmly pressing the skin onto the top of the instrument's body, preventing displacement of the skin when the rope is subsequently attached. The adjustment component, with the help of the adjusting spring's reaction force, keeps the base block tightly against the outer wall of the instrument's body, assisting in precise alignment of the skin edge with the base block. Simultaneously, the positioning rod and positioning ring of the positioning component work together to ensure precise engagement of the sliding limit component's limit block, preventing the inner rod from shifting and affecting the direction of the rope tension. Ultimately, this achieves complete alignment between the center of the skin and the center of the instrument's resonating cavity, eliminating acoustic dead zones caused by skin misalignment, ensuring a pure erhu tone from the source, and reducing noise and intonation deviations.

[0014] By moving the slider, the annular distribution radius of the sleeve and the base block can be adjusted, easily adapting to different body sizes of erhus, from small soprano erhus to large bass erhus. The adjustment rod and spring combination of the adjustment component can automatically extend and retract according to the outer diameter of the body, ensuring that the base block always fits tightly against the body, eliminating the need for repeated manual calibration. This adaptive adjustment capability significantly reduces the equipment procurement and debugging costs for manufacturers of different product specifications, improves equipment utilization, and is especially suitable for multi-category erhu production scenarios.

[0015] The ring-array design of the tensioning components allows multiple ropes to apply tension to the edge of the skin simultaneously, avoiding the uneven tension zones created by traditional manual pulling. The arc-shaped and vertical grooves of the rotating components work together to lock the sleeve before it moves vertically downwards. Furthermore, the telescopic springs in the telescopic components assist in the initial tensioning of the ropes, reducing manual pulling force and lowering the operational threshold. This entire mechanism standardizes the skin tension control, preventing quality fluctuations caused by differences in worker skill and ensuring consistent tone in every erhu. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2This is a schematic diagram of the tensioning component structure of the present invention; Figure 3 This is a schematic diagram of the rotating component structure of the present invention; Figure 4 This is a schematic diagram of the telescopic component structure of the present invention; Figure 5 This is a schematic diagram of the sliding limiting component structure of the present invention; Figure 6 This is a schematic diagram of the positioning component structure of the present invention; Figure 7 This is a partial cross-sectional view of the positioning component of the present invention; Figure 8 This is a schematic diagram of a partial exploded structure of the tensioning component of the present invention; Figure 9 This is a schematic diagram of the support component structure of the present invention; Figure 10 This is a schematic diagram of the adjustment component structure of the present invention.

[0017] In the picture: 1. Base plate; 11. Column; 12. Support plate; 13. Soundbox body; 14. U-shaped frame; 2. Tensioning assembly; 21. Base block; 22. Sleeve; 23. Inner rod; 24. Rope; 3. Rotating assembly; 31. Arc groove; 32. Vertical groove; 33. Guide block; 4. Telescopic assembly; 41. Telescopic plate; 42. Telescopic spring; 5. Sliding limit assembly; 51. Rotating rod; 52. Limiting hole; 53. Vertical hole; 54. Limiting block; 6. Positioning assembly; 61. Positioning rod; 62. Positioning ring; 7. Support assembly; 71. Threaded ring; 72. Fixing plate; 73. Slider; 8. Adjusting assembly; 81. Adjusting rod; 82. Adjusting spring; 9. Pressing assembly; 91. Electric actuator; 92. Pressing plate. Detailed Implementation

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] Example 1, referring to Figures 1-8This invention provides a first embodiment of a skin tensioning device for processing the body of an erhu (a two-stringed bowed instrument). The device includes a base plate 1, a column 11 fixedly connected to the top of the base plate 1, a support plate 12 fixedly connected to the top of the column 11, a body 13 of the erhu body mounted on the top of the support plate 12, and a U-shaped frame 14 fixedly connected to the top of the base plate 1. It also includes a tensioning component mounted on the support plate 12. The tensioning component includes a tensioning assembly 2 mounted on the support plate 12, and a rotating assembly 3, a telescopic assembly 4, a sliding limiting assembly 5, and a positioning assembly 6 mounted on the tensioning assembly 2. The tensioning component is used to synchronously tension the edges of the skin. The tensioning assembly 2 includes multiple base blocks 21 slidably connected to the support plate 12 in a circular array. A sleeve 22 is movably connected to each base block 21, and an inner rod 23 is movably connected to the inner side of the sleeve 22. A rope 24 is fixedly connected to the top of the inner rod 23.

[0020] Specifically, the violin body 13 is first positioned on top of the support plate 12. Then, the edge of the violin body 13 to be skinned is aligned with the circular array of base blocks 21. This ensures the center of the skin coincides with the center of the resonating cavity of the violin body 13, avoiding initial alignment deviations. Next, the tensioning mechanism is activated. Based on the diameter of the violin body 13, multiple base blocks 21 are adjusted by sliding along the edge of the support plate 12. Larger diameter violin bodies have their base blocks 21 moved outwards, while smaller diameter violin bodies have their base blocks 21 moved inwards, until all base blocks 21 are at the same distance from the skin edge, adapting to the current skinning requirements of the violin body. Afterwards, the operator secures one end of multiple ropes 24 to corresponding points on the skin edge. Finally, the drive sleeve 22 moves downwards vertically, causing the inner rod 23 to move downwards simultaneously. The inner rod 23 applies a uniform downward pulling force to the skin edge through the ropes 24, achieving skin tension. The combined action of multiple ropes (24) prevents uneven stress on the skin, avoiding areas of looseness or tightness that could exacerbate tone imbalances and make repairs difficult.

[0021] Reference Figure 3 The rotating component 3 includes an arc-shaped groove 31 formed on the sleeve 22. The sleeve 22 also has a vertical groove 32 that communicates with the arc-shaped groove 31. The inner sides of the arc-shaped groove 31 and the vertical groove 32 are slidably connected to a guide block 33, which is fixedly connected to the bottom block 21.

[0022] Specifically, when the sleeve 22 moves downward, the guide block 33 slides inside the arc groove 31. Under the action of the arc groove 31, the sleeve 22 rotates. Then, the guide block 33 slides from the inside of the arc groove 31 into the vertical groove 32. Under the action of the vertical groove 32, the sleeve 22 moves vertically downward.

[0023] Reference Figure 4 The telescopic assembly 4 includes a telescopic plate 41 that is slidably connected to the inside of the sleeve 22. The telescopic plate 41 is fixedly connected to the inner rod 23, and a telescopic spring 42 is fixedly connected between the telescopic plate 41 and the sleeve 22.

[0024] Specifically, pulling rope 24 upwards causes the inner rod 23 to move upwards, allowing the telescopic plate 41 to slide upwards inside the sleeve 22, stretching the telescopic spring 42 until one end of rope 24 hooks onto the edge of the skin. Releasing rope 24 then causes the inner rod 23 to move downwards under the action of the telescopic spring 42, tightening rope 24 and initially tightening the edge of the skin. The stretching or shortening action of the telescopic spring 42 allows rope 24 to move up and down within a small range, facilitating hooking one end of rope 24 onto the edge of the skin.

[0025] Reference Figure 5 The sliding limit assembly 5 includes a rotating rod 51 fixedly connected to the inside of the sleeve 22. The rotating rod 51 is inserted into the telescopic spring 42. The telescopic plate 41 is slidably connected to the rotating rod 51. Multiple limit holes 52 are symmetrically distributed on the rotating rod 51. Vertical holes 53 communicating with the multiple limit holes 52 are also provided on the rotating rod 51. The vertical holes 53 and the multiple limit holes 52 are slidably connected to the same limit block 54. The limit block 54 has an inclined surface.

[0026] Specifically, initially, the limiting block 54 is located inside the vertical hole 53. Under the action of the vertical hole 53, the inner rod 23 moves upward, causing the telescopic plate 41 to move upward. The telescopic plate 41 moves upward, causing the limiting block 54 to slide upward inside the vertical hole 53, facilitating the placement of one end of the rope 24 on the edge of the skin. When the sleeve 22 rotates, it drives the rotating rod 51 to rotate, causing the limiting block 54 to slide from inside the vertical hole 53 into one of the limiting holes 52. The limiting block 54 is provided with an inclined surface. The inclined plane allows the limiting block 54 to slide from the vertical hole 53 into the limiting hole 52 regardless of its position. Then, the inner rod 23 is pulled upward, causing the telescopic plate 41 to move upward. Under the action of the limiting hole 52, the limiting block 54 is limited, which in turn limits the telescopic plate 41, preventing the inner rod 23 from continuing to move upward and locking the inner rod 23. The sleeve 22 moves downward, which in turn causes the inner rod 23 to move downward, tightening the rope 24.

[0027] Reference Figures 6-8 The positioning component 6 includes a positioning rod 61 rotatably connected to the rotating rod 51, and a positioning ring 62 is slidably connected to the upper limit of the positioning rod 61. The positioning ring 62 is fixedly connected to the limiting block 54.

[0028] Specifically, when the inner rod 23 moves upward, it drives the limiting block 54 to move upward inside the vertical hole 53 via the telescopic plate 41, causing the positioning ring 62 to slide upward on the positioning rod 61. When the rotating rod 51 rotates, since the rotating rod 51 is rotatably connected to the positioning rod 61, the positioning rod 61 does not rotate, allowing the limiting block 54 to slide from the vertical hole 53 into the limiting hole 52.

[0029] Example 2, refer to Figure 9 This is the second embodiment of the present invention, which differs from the first embodiment in that: the tensioning component further includes a support assembly 7 installed on the column 11, and an adjustment assembly 8 is installed on the support plate 12; the support assembly 7 includes a threaded ring 71 threadedly connected to the column 11, a connecting ring rotatably sleeved on the threaded ring 71, and multiple fixing plates 72 fixedly connected in a ring array on the connecting ring, and sliders 73 slidably connected to each of the multiple fixing plates 72, the sliders 73 being rotatably connected to the corresponding sleeves 22, and the positioning rod 61 passing through the sleeves 22 and fixedly connected to the sliders 73.

[0030] Specifically, rotating the threaded ring 71 establishes a threaded connection between the threaded ring 71 and the column 11, causing the threaded ring 71 to move on the column 11. This movement drives the connecting ring to move, which in turn drives the slider 73 to move via the fixing plate 72, thereby moving the sleeve 22. The sleeve 22 slides on the fixing plate 72, causing the base block 21 to move, thus placing different sizes of instrument body 13.

[0031] Reference Figure 10 The adjustment component 8 includes grooves arranged in a ring array on the support plate 12. An adjustment rod 81 is slidably connected to the inside of the groove. An adjustment spring 82 is fixedly connected between the adjustment rod 81 and the inside of the groove. The adjustment rod 81 is fixedly connected to the corresponding bottom block 21.

[0032] Specifically, the soundbox body 13 is placed on the support plate 12, and the bottom block 21 is pressed, causing the adjusting rod 81 to slide inside the groove, stretching the adjusting spring 82. Under the action of the adjusting spring 82, the adjusting rod 81 tends to pull in the opposite direction, making the bottom block 21 tightly adhere to the soundbox body 13, thus clamping the soundbox body 13. At the same time, it can accommodate soundbox bodies 13 of different sizes. The rest of the structure is the same as that in Embodiment 1.

[0033] Example 3, referring to Figure 1 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that it also includes a pressing component 9 installed on the U-shaped frame 14. The pressing component 9 includes an electric push rod 91 fixedly connected to the U-shaped frame 14. The output end of the electric push rod 91 passes through the U-shaped frame 14 and is fixedly connected to a pressing plate 92.

[0034] Specifically, the skin is placed on top of the body 13 of the instrument body. The electric actuator 91 is activated, causing the lower pressure plate 92 to move downwards, so that the lower pressure plate 92 contacts the top of the body 13 of the instrument body, pressing the skin tightly. Then, one end of the rope 24 is looped around the edge of the skin to prevent the skin from moving when the rope 24 is looped around the edge of the skin, which could cause the skin to be crooked during the application process. The rest of the structure is the same as that in Embodiment 2.

[0035] Based on embodiments 1-3, the working principle of this invention is as follows: First, the body 13 of the instrument is placed on top of the support plate 12. The adjusting rod 81 of the adjusting component 8 is pressed and slides in the groove, stretching the adjusting spring 82. The spring reaction force makes the bottom block 21 fit tightly against the instrument body, achieving adaptive clamping and positioning. The electric push rod 91 on the U-shaped frame 14 is activated, which drives the lower pressure plate 92 to move down and press the skin to prevent the skin from shifting when the rope is put on later. The threaded ring 71 on the column 11 is rotated, which drives the slider 73 to move through the connecting ring and the fixing plate 72, thereby adjusting the position of the sleeve 22 and the bottom block 21 to adapt to different diameter instrument bodies. At the same time, the worker fixes one end of the rope 24 to the edge of the skin and the other end to the inner rod 23. Pulling the inner rod 23 causes the telescopic plate 41 of the telescopic component 4 to slide up and stretch the telescopic spring 42. The spring force assists the rope 24 to initially tighten the skin. As the drive sleeve 22 moves downward, the guide block 33 of the rotating component 3 first slides along the arc groove 31 to rotate the sleeve 22, and then enters the vertical groove 32 to guide the sleeve 22 to move vertically downward. The rotation of the sleeve 22 drives the rotating rod 51 of the sliding limiting component 5 to rotate, and the limiting block 54 slides from the vertical hole 53 into the limiting hole 52. The positioning rod 61 of the positioning component 6 cooperates with the positioning ring 62 to ensure that the limiting block 54 is precisely engaged, locking the inner rod 23 to prevent it from moving upward. Finally, the sleeve 22 continues to move downward, driving the inner rod 23 to apply a uniform tension to the edge of the skin through the rope 24. The tensioning component 2 of the ring array works synchronously to prevent the membrane tension from becoming unbalanced. This achieves precise alignment and synchronous tensioning of the skin, solving the problems of crooked skin and uneven tension in traditional systems, and ensuring the stability of the erhu's tone.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A skin tensioning device for processing the soundbox of an erhu (a two-stringed bowed instrument), comprising a base plate (1), a column (11) disposed on the top of the base plate (1), a support plate (12) disposed on the top of the column (11), a soundbox body (13) disposed on the top of the support plate (12), and a U-shaped frame (14) disposed on the top of the base plate (1), characterized in that: It also includes a tensioning component disposed on the support plate (12); The tensioning component includes a tensioning assembly (2) disposed on the support plate (12), and the tensioning assembly (2) is provided with a rotating assembly (3), a telescopic assembly (4), a sliding limiting assembly (5) and a positioning assembly (6). The tensioning component is used to simultaneously tension the edges of the skin; The tensioning assembly (2) includes multiple bottom blocks (21) arranged in a ring array on the support plate (12), a sleeve (22) is provided on the bottom block (21), an inner rod (23) is provided inside the sleeve (22), and a rope (24) is provided on the top of the inner rod (23).

2. The skin tensioning device for processing the erhu soundbox according to claim 1, characterized in that: The rotating assembly (3) includes an arc groove (31) provided on the sleeve (22), and a vertical groove (32) connected to the arc groove (31) is also provided on the sleeve (22). A guide block (33) is provided on the inner side of the arc groove (31) and the vertical groove (32), and the guide block (33) is fixedly connected to the bottom block (21).

3. The skin tensioning device for processing the erhu soundbox according to claim 1, characterized in that: The telescopic assembly (4) includes a telescopic plate (41) disposed inside the sleeve (22), the telescopic plate (41) is fixedly connected to the inner rod (23), and a telescopic spring (42) is disposed between the telescopic plate (41) and the sleeve (22).

4. The skin tensioning device for processing the erhu soundbox according to claim 3, characterized in that: The sliding limiting assembly (5) includes a rotating rod (51) disposed inside the sleeve (22). The rotating rod (51) is disposed inside the telescopic spring (42). The telescopic plate (41) is slidably connected to the rotating rod (51). Multiple limiting holes (52) are symmetrically distributed on the rotating rod (51). The rotating rod (51) is also provided with a vertical hole (53) communicating with the multiple limiting holes (52). The vertical hole (53) and the multiple limiting holes (52) are provided with the same limiting block (54) inside. The limiting block (54) is provided with an inclined surface.

5. The skin tensioning device for processing the erhu soundbox according to claim 4, characterized in that: The positioning component (6) includes a positioning rod (61) disposed on a rotating rod (51), a positioning ring (62) disposed on the positioning rod (61), and the positioning ring (62) is fixedly connected to the limiting block (54).

6. The skin tensioning device for processing the erhu soundbox according to claim 5, characterized in that: The tensioning component also includes a support assembly (7) provided on the column (11) and an adjustment assembly (8) provided on the support plate (12). The support assembly (7) includes a threaded ring (71) on the column (11), a connecting ring on the threaded ring (71), and multiple fixing plates (72) arranged in a ring array on the connecting ring. Each of the multiple fixing plates (72) is provided with a slider (73). The slider (73) is rotatably connected to the corresponding sleeve (22). The positioning rod (61) passes through the sleeve (22) and is fixedly connected to the slider (73).

7. The skin tensioning device for processing the erhu soundbox according to claim 6, characterized in that: The adjustment component (8) includes grooves arranged in a ring array on the support plate (12), an adjustment rod (81) is provided inside the groove, an adjustment spring (82) is provided between the adjustment rod (81) and the inside of the groove, and the adjustment rod (81) is fixedly connected to the corresponding bottom block (21).

8. The skin tensioning device for processing the erhu soundbox according to claim 1, characterized in that: It also includes a pressing assembly (9) set on the U-shaped frame (14), the pressing assembly (9) including an electric push rod (91) set on the U-shaped frame (14), the output end of the electric push rod (91) passing through the U-shaped frame (14) and a pressing plate (92) is provided.

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