A double-beam liuqin

Abstract

A double-beam liuqin includes a resonance box, the body of which is composed of a panel and a bottom plate, and is characterized in that: two upper sound beams are fixedly arranged in parallel on the inner wall of the panel; a transverse groove and a longitudinal groove are provided on the inner wall of the panel, and the transverse groove and the longitudinal groove are mutually connected to form a transverse sound tunnel and a longitudinal sound tunnel; a transverse sound beam is fixedly arranged between the panel and the bottom plate, and the transverse sound beam and the two upper sound beams are combined to divide the space corresponding to the inner wall of the panel into six resonance areas. This scheme breaks the constraints of the traditional design of the internal structure of the liuqin resonance box in the past, and boldly proposes a new improved design scheme, which solves the problem that the liuqin in the past could not take into account the high, middle and low pitch areas and have good resonance timbre and penetration at the same time, so that the penetration of the liuqin sound (small attenuation, far transmission) is greatly enhanced, the high pitch area is bright and rigid, the middle pitch area is soft and mellow, and the bass area sound quality is more mellow.

Description

Technical Field

[0001] The invention relates to a traditional Chinese plucked string instrument, in particular to a double-tone beam liuqin. Background Art

[0002] Liuqin, also known as willow leaf qin, diamond leg, and earth pipa, is a traditional Chinese plucked string instrument. It was originally popular in Jiangsu, Shandong, Anhui and other provinces. It is now popular all over the country, mainly in Linyi, Shandong and northern Jiangsu. It is a kind of pear-shaped sound box plucked string instrument that has been popular among the people since the Tang Dynasty. Its appearance, structure, and playing method are similar to Ruan.

[0003] Today, the Liuqin plays a variety of roles in the field of Chinese music performance. In the folk band, the Liuqin is a high-pitched instrument in the plucked instrument group, with a unique sound effect, and often plays the important main melody in the high pitch area. Because its timbre is not easily covered and integrated by other instruments, it is sometimes used to play highly technical cadenza passages. In addition, the Liuqin also has the sound effects of the Western instrument mandolin, and it has a unique flavor when it cooperates with Western bands.

[0004] Liuqin is composed of the headstock, pegs, top, sound window, mountain pass, frets, bridges, fine tuning, bottom plate (back plate) and other parts. The tuning of Liuqin is generally fixed pitch. The first string, also called the sub-string, is tuned to the d of the second group of small notes; the second string, also called the middle string, is tuned to the g of the first group of small notes; the third string, also called the inner string, is tuned to the d of the first group of small notes; the fourth string, also called the winding string, is tuned to the g of the first group of small notes. Liuqin is small in style, bright in tone, and has a wide range of sound. At first, because it was made of the Chaoyang wood at the bottom of the willow tree and shaped like a willow leaf, people called it "Liuqin" or "Willow Leaf Qin".

[0005] The current shortcomings of the Liuqin are: relative to the mid-range, the timbre of the high and low ranges needs to be improved, the high range is not bright, and the low range is not thick and round enough, and the penetration of the sound needs to be further improved. The main reason is that the current Liuqin resonance box cannot meet the requirements of good resonance and vibration from the high range to the low range, that is, it cannot adapt to the resonance and vibration of the wide frequency changes in the high range, mid-range and low range at the same time. Further research shows that there are many factors that affect the resonance and vibration in the resonance box. In addition to the material and thickness of the panel and bottom plate, the internal structure and construction of the resonance box have a greater impact. However, the existing Liuqin's resonance box design is unreasonable, which is not conducive to the resonance box to exert good sound wave resonance and vibration from the high range to the low range.

[0006] In view of this, how to improve the resonance box of the existing liuqin, especially how to improve the internal structure and construction of the resonance box is the subject of the present invention. Summary of the invention

[0007] The invention provides a double-beam liuqin, which aims to solve the problem that the existing liuqin resonance box cannot take into account the high, middle and low frequency ranges and have good resonance timbre and penetration.

[0008] To achieve the above object, the technical solution adopted by the present invention is: a double-beam liuqin, including a resonance box, the box body of which is composed of a panel and a bottom plate, and its innovation lies in:

[0009] Two upper sound beams are arranged in the resonance box. The upper sound beams are long strip-shaped sound beam components. One side of the two upper sound beams is tightly fixed on the inner wall of the panel, and one side of the two upper sound beams is suspended in the resonance box relative to the bottom plate. The length direction of the two upper sound beams is consistent with the length direction of the resonance box. When viewed in the width direction of the resonance box, the two upper sound beams are parallel and separated by a distance.

[0010] A first groove is provided on the inner wall of the panel of the resonance box, and the first groove is opened along the width direction of the resonance box; a second groove is provided on the inner wall of the panel of the resonance box, and the second groove is opened along the length direction of the resonance box; the first groove and the second groove are cross-arranged and interconnected on the inner wall of the panel, wherein the second groove is located between two upper sound beams, and the length direction of the second groove is consistent with the length direction of the upper sound beams; the first groove spans the two upper sound beams in the width direction of the resonance box and forms an upper transverse sound tunnel on the inner wall of the panel, and the second groove forms an upper longitudinal sound tunnel on the inner wall of the panel.

[0011] The relevant contents in the above technical solution are explained as follows:

[0012] 1. In the above scheme, the theme is "Liuqin", and the innovation is concentrated on the "resonance box" of Liuqin, so other structures and constructions other than the resonance box are not described. It can be considered that other structures of the Liuqin of the present invention except the resonance box are realized by using existing technology.

[0013] 2. In the above scheme, the "resonance box" refers to a sound box composed of a panel and a bottom plate (back plate). The length direction of the Liuqin resonance box refers to the direction roughly consistent with the strings, and the width direction of the resonance box is perpendicular to the length direction. The "inner wall" for the resonance box refers to the inner wall surface, for example, the inner wall of the panel refers to the wall surface on the inner side of the panel of the resonance box, and the inner wall of the bottom plate refers to the wall surface on the inner side of the bottom plate of the resonance box.

[0014] 3. In the above scheme, two lower sound beams can be provided in the resonance box, and the lower sound beams are long strip-shaped sound beam components. One side of the two lower sound beams is tightly fixed on the inner wall of the bottom plate, and the other side of the two lower sound beams is suspended in the resonance box relative to the panel. The length direction of the two lower sound beams is consistent with the length direction of the resonance box. When viewed in the width direction of the resonance box, the two lower sound beams are parallel and separated by a distance.

[0015] A third groove is provided on the inner wall of the bottom plate of the resonance box, and the third groove is opened along the width direction of the resonance box; a fourth groove is provided on the inner wall of the bottom plate of the resonance box, and the fourth groove is opened along the length direction of the resonance box; the third groove and the fourth groove are cross-arranged and interconnected on the inner wall of the bottom plate, wherein the fourth groove is located between the two lower sound beams, and the length direction of the fourth groove is consistent with the length direction of the lower sound beams; the third groove spans the two lower sound beams in the width direction of the resonance box and forms a lower horizontal sound tunnel on the inner wall of the bottom plate, and the fourth groove forms a lower longitudinal sound tunnel on the inner wall of the bottom plate.

[0016] 4. In the above scheme, a transverse beam can be provided in the resonance box, and the transverse beam is in the shape of a plate, wherein the transverse beam is arranged at the position of the first groove and is symmetrical with respect to the center plane of the second groove, the top of the transverse beam is fixedly connected to the panel, and the bottom of the transverse beam is fixedly connected to the bottom plate.

[0017] 5. In the above scheme, an upper bridge hole can be provided on the upper sound beam, the upper bridge hole is a hole on one side of the upper sound beam and forms an upper bridge-type sound beam structure, and the upper bridge hole is mounted on the first groove. A lower bridge hole can also be provided on the lower sound beam, the lower bridge hole is a hole on one side of the lower sound beam and forms a lower bridge-type sound beam structure, and the lower bridge hole is mounted on the third groove.

[0018] 6. In the above solution, an upper reinforcing plate may be fixedly mounted between the two upper sound beams, and a lower reinforcing plate may be fixedly mounted between the two lower sound beams.

[0019] 7. In the above scheme, the transverse sound beam is arranged in the horizontal direction in the resonance box, and a through hole is opened in the center of the transverse sound beam; a circular notch is provided on the side where the transverse sound beam is connected to the panel and the bottom plate, and a crescent hole is formed between the circular notch and the inner wall of the panel and the bottom plate in the assembled state.

[0020] 8. In the above solution, it is best if the first groove, the second groove, the third groove and the fourth groove are all arc-shaped grooves.

[0021] The design principle and concept of the present invention are: for the liuqin, there are many factors that affect its timbre and penetration, such as the material, thickness, internal structure, etc. of the resonance box. In order to solve the problem that the existing liuqin resonance box cannot take into account the high, medium and low frequency ranges while having good resonance timbre and penetration, the present invention is mainly improved from the perspective of the internal structure of the resonance chamber. It is specifically embodied in the following aspects: first, two upper sound beams are fixed and arranged in parallel on the inner wall of the panel in the resonance chamber; second, grooves (i.e., the first groove and the second groove) are opened on the inner wall of the panel in the resonance chamber, and the grooves form an upper transverse sound tunnel and an upper longitudinal sound tunnel on the inner wall of the panel. In view of the problem that the high pitch area of ​​the existing liuqin is not bright, and the bass area is not thick and round enough, the resonance box of the liuqin, especially the structure of the resonance chamber and the sound generation mechanism are deeply discussed and studied, and it is found that the main reason for the poor timbre and penetration of the high and low pitch areas of the existing liuqin is due to the unreasonable design of the resonance box, especially the resonance chamber, which causes the sound waves to not produce good resonance and vibration in the resonance chamber during performance. Based on this, the inventor broke the constraints of the previous design of the traditional resonance box (especially the resonance chamber) of the Liuqin, and boldly proposed the improved design scheme of the present invention. From the perspectives of sound wave transmission, vibration, resonance, and sound generation, it solved the problems that the high-pitched area of ​​the Liuqin is not bright, and the low-pitched area is not thick and round enough. Practice has proved that the improved design scheme has outstanding substantial characteristics and significant technological progress, which greatly enhances the penetration of the sound of the Liuqin (little attenuation, long transmission), the high-pitched area is bright and rigid, the middle-pitched area is soft and mellow, and the sound quality of the low-pitched area is more mellow.

[0022] Due to the application of the above technical solution, the present invention has the following advantages and effects compared with the existing guzheng resonance box (described in detail with the best implementation mode, i.e., the content of the embodiment of the present invention):

[0023] 1. The present invention is provided with a double sound beam structure in the center of the panel (i.e., two upper sound beams are arranged in parallel on the inner wall of the panel). Since the bass has a larger amplitude and lower frequency than the treble, the bass resonance is concentrated in the central area of ​​the resonance box, and the treble resonance is concentrated in the surrounding edge areas of the resonance box, which strengthens the strength of the central area of ​​the panel and plays an important role in improving the timbre and penetration of the bass area. On the other hand, strengthening the strength of the central area of ​​the panel relatively changes the thickness difference between the central area and the surrounding edge areas of the resonance box, which also has a good effect on improving the timbre and penetration of the treble area.

[0024] 2. The present invention provides grooves (i.e., the first groove and the second groove) on the inner wall of the panel, which are interconnected on the inner wall of the panel to actually form longitudinal sound tunnels and transverse sound tunnels. These sound tunnels form tunnels for sound wave transmission in the resonance chamber. Since the bass has a larger amplitude and lower frequency than the treble, the bass resonance is concentrated in the central area of ​​the resonance box, and the treble resonance is concentrated in the peripheral areas of the resonance box. When the string vibration is collected by the central area and quickly transmitted to the periphery of the resonance chamber through the sound tunnel (i.e., the sound tunnel), this plays a key role in improving the timbre and penetration of the treble area, and also plays a good role in improving the timbre and penetration of the bass area.

[0025] 3. The present invention designs the sound beam into a bridge-type sound beam structure, especially a hole is designed on one side of the sound beam, so that the sound beam is like a bridge arch structure. When such a sound beam is erected on the sound tunnel, it is more conducive to the transmission of vibration through the sound tunnel and also more conducive to the resonance of the resonance box.

[0026] 4. The present invention adopts the design of transverse sound beams (first transverse sound beam and second transverse sound beam). When the resonance box is viewed from above, these transverse sound beams and two upper sound beams are combined to divide the space corresponding to the inner wall of the panel into six resonance areas. When a lower sound beam is provided on the inner wall of the bottom plate, the transverse sound beams (first transverse sound beam and second transverse sound beam) and two lower sound beams are combined to divide the space corresponding to the inner wall of the bottom plate into six resonance areas, totaling twelve resonance areas. When the liuqin is played, the vibration of the strings is first transmitted to the central area of ​​the resonance cavity, and then transmitted to these twelve resonance areas through the sound tunnel, and resonance and vibration are generated, thereby amplifying the string sound into the resonance sound of the resonance box. Before the improvement, only five sound waves can be generated when the liuqin is played, that is, the two sound beams divide the resonance cavity into three resonance areas, each resonance area generates one sound wave, plus one string wave, plus one firing wave, totaling five sound waves. The improved single-sided double-beam liuqin of the present invention can generate eight sound waves when playing, wherein six resonance areas generate six sound waves, plus one string wave, plus one percussion wave, for a total of eight sound waves. The double-sided double-beam liuqin can generate fourteen sound waves when playing, wherein twelve resonance areas generate twelve sound waves, plus one string wave, plus one percussion wave, for a total of fourteen sound waves. The sound wave amount is the number of sound waves. For a plucked instrument in a specific resonance box, in addition to one string wave and one percussion wave, it mainly depends on the number of resonance areas in the resonance box. Usually, each resonance area of ​​the instrument generates one sound wave when playing, and the number of sound waves generated is the same as the number of resonance areas. In addition, the sound wave amount directly affects the timbre, penetration and volume of the instrument. Therefore, the design of the present invention can significantly improve the timbre of the treble and bass areas, and increase the penetration and volume of the treble and bass areas.

[0027] 5. The through holes on the transverse sound beam of the present invention and the crescent holes between the transverse sound beam and the top plate and bottom plate are channels between various resonance areas in the resonance cavity. This channel design is conducive to the mutual transmission of sound waves, resonance and vibration.

[0028] 6. The present invention fixes an upper reinforcing plate between two upper sound beams and a lower reinforcing plate between two lower sound beams, which can increase the strength of the middle area of ​​the panel and the bottom plate, especially between the upper sound beams and between the lower sound beams, and increase the load when the two upper sound beams and the two lower sound beams resonate, further improving the timbre and penetration of the bass area. On the other hand, the central area of ​​the resonance box is strengthened, and the strength gap with the peripheral areas of the resonance box is relatively widened, which is also conducive to improving the timbre and penetration of the treble area.

[0029] 7. The first groove, the second groove, the third groove and the fourth groove of the present invention are all arc-shaped grooves, which can minimize the thickness changes of the panel and the bottom plate, thereby affecting the resonance and vibration of the resonance box.

[0030] The above advantages and effects are all described in the best way. However, it should be particularly emphasized that for the present invention, the measures of setting a double-beam structure and opening a groove on the inner wall of the panel are more important than adopting equivalent measures on the inner wall of the bottom plate, and the effect and effect are relatively better. The reason is that the panel is provided with strings, while the bottom plate is not directly connected to the strings. Therefore, setting a double-beam structure and opening a groove on the inner wall of the panel are the key to solving the technical problem of the present invention, and setting a double-beam structure and opening a groove on the inner wall of the bottom plate are icing on the cake for the present invention, which is easy to understand for those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Attached Figure 1 This is the main view of the existing Liuqin;

[0032] Attached Figure 2 This is the left view of the existing Liuqin;

[0033] Attached Figure 3 for Figure 1 AA section view;

[0034] Attached Figure 4 This is a schematic diagram of the main structure of the Liuqin according to Embodiment 1 of the present invention;

[0035] Attached Figure 5 This is a left side view of a Liuqin according to Embodiment 1 of the present invention;

[0036] Attached Figure 6 for Figure 4 BB cross-sectional view;

[0037] Attached Figure 7 for Figure 6 A cross-sectional view of the resonance box in FIG.

[0038] Attached Figure 8 for Figure 4 CC section view;

[0039] Attached Fig. 9 This is a schematic diagram of the main structure of the Liuqin according to Embodiment 2 of the present invention;

[0040] Attached Fig.10 This is a left side view of a liuqin according to Embodiment 2 of the present invention;

[0041] Attached Fig.11 for Fig. 9 DD cross-sectional view;

[0042] Attached Fig.12 for Fig.11 A cross-sectional view of the resonance box in FIG.

[0043] Attached Fig.13 for Fig. 9 EE cross-sectional view;

[0044] Attached Fig.14 It is a front view of the upper sound beam in Embodiment 1 and Embodiment 2 of the present invention;

[0045] Attached Fig.15 It is a left view of the upper sound beam in Embodiment 1 and Embodiment 2 of the present invention;

[0046] Attached Fig.16 This is a front view of the lower sound beam in Embodiment 2 of the present invention;

[0047] Attached Fig.17 It is a left view of the lower sound beam in Embodiment 2 of the present invention;

[0048] Attached Fig.18 It is a front view of the first transverse sound beam in Embodiment 1 and Embodiment 2 of the present invention;

[0049] Attached Fig.19 It is a left view of the first transverse sound beam in Embodiment 1 and Embodiment 2 of the present invention;

[0050] Attached Fig. 20 It is a front view of the second transverse sound beam in Embodiment 1 and Embodiment 2 of the present invention;

[0051] Attached Fig.21 It is a left view of the second transverse sound beam in Example 1 and Example 2 of the present invention.

[0052] In the above figures: 1. panel; 2. bottom plate; 3. sound beam; 4. eight-shaped sound beam; 5. sound post; 6. upper sound beam; 7. lower sound beam; 8. first groove; 9. second groove; 10. third groove; 11. fourth groove; 12. upper bridge hole; 13. lower bridge hole; 14. sound hole; 15. first horizontal sound beam; 16. second horizontal sound beam; 17. upper reinforcement plate; 18. lower reinforcement plate; 19. first round notch; 20. first crescent hole; 21. second round notch; 22. second crescent hole; 23. first through hole; 24. second through hole. DETAILED DESCRIPTION

[0053] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0054] Embodiment 1: A double-beam Liuqin (single-sided double-beam structure)

[0055] Since the innovations of the present invention are all concentrated on the resonance box, this embodiment will focus on describing the structure and construction of the liuqin resonance box, while other structures related to the liuqin can be considered to be implemented using existing technologies and will not be described in detail in this embodiment.

[0056] The structure and construction of the Liuqin resonance box of this embodiment are as follows: Figure 4-Figure 8 , Fig.14 , Fig.15 , Figure 18-Figure 21 As shown, the body of the resonance box is composed of a panel 1 and a bottom plate 2 (see Figure 5-Figure 8 ).

[0057] Two upper sound beams 6 are arranged in the resonance box (see Figure 4 and Figure 6 ), the upper sound beam 6 is a long sound beam component (see Fig.14 and Fig.15 ), one side of the two upper sound beams 6 is closely fixed to the inner wall of the panel 1, and the other side of the two upper sound beams 6 is suspended in the resonance box relative to the bottom plate 2 (see Figure 6 ), the length direction of the two upper sound beams 6 is consistent with the length direction of the resonance box (see Figure 4 ), in the width direction of the resonance box, the two upper beams 6 are parallel and spaced apart by a distance (see Figure 6 The upper sound beam 6 is provided with an upper bridge hole 12 (see Fig.14 ), the upper bridge hole 12 is a hole on one side of the upper sound beam 6 and makes the upper sound beam 6 form an upper bridge type sound beam structure, and the upper bridge hole 12 is mounted on the first groove 8.

[0058] Two first grooves 8 are provided on the inner wall of the panel 1 of the resonance box (see Figure 4), the two first grooves 8 are both opened along the width direction of the resonance box, and the two first grooves 8 are arranged at intervals in the length direction of the resonance box. A second groove 9 is provided on the inner wall of the panel 1 of the resonance box (see Figure 4 ), the second groove 9 is opened along the length direction of the resonance box, and the second groove 9 is located at the center of the width direction of the resonance box. The two first grooves 8 and the one second groove 9 intersect and penetrate each other on the inner wall of the panel 1 (see Figure 7 ), wherein the second groove 9 is located between the two upper sound beams 6, and the length direction of the second groove 9 is consistent with the length direction of the upper sound beam 6. The two first grooves 8 span the two upper sound beams 6 in the width direction of the resonance box, and form two upper transverse sound tunnels on the inner wall of the panel 1 (see Figure 4 ), the second groove 9 forms an upper longitudinal sound tunnel on the inner wall of the panel 1 (see Figure 4 ).

[0059] The length of the first groove 8 is less than the length of the resonance box inner panel 1 at the position corresponding to the first groove 8 (see Figure 4 ), smooth transition surfaces are provided between the two ends of the first groove 8 and the inner wall of the panel 1. The length of the second groove 9 is less than the length of the panel 1 at the corresponding position of the second groove 9 in the resonance box (see Figure 4 ), smooth transition surfaces are provided between the two ends of the second groove 9 and the inner wall of the panel 1.

[0060] A first transverse beam 15 and a second transverse beam 16 are provided in the resonance box (see Figure 4 ), the first transverse beam 15 and the second transverse beam 16 are both in the form of plates, wherein the two first transverse beams 15 are arranged at the position of a first groove 8 and are bilaterally symmetrical with respect to the center plane of the second groove 9 (see Figure 4 ), the top of each first transverse beam 15 is fixedly connected to the panel 1, and the bottom of the first transverse beam 15 is fixedly connected to the bottom plate 2 (see Figure 6 The two second transverse beams 16 are arranged at the position of another first groove 8 and are bilaterally symmetrical with respect to the center plane of the second groove 9 (see Figure 4 ), the top of each second transverse beam 16 is fixedly connected to the panel 1, and the bottom of the second transverse beam 16 is fixedly connected to the bottom plate 2 (see Figure 8 The first transverse beam 15 and the second transverse beam 16 are both arranged in the horizontal direction in the resonance box, and a first through hole 23 is opened in the center of the first transverse beam 15 (see Fig.18 A second through hole 24 is provided in the center of the second transverse beam 16 (see Fig. 20 The first transverse beam 15 is provided with a first circular notch 19 on the side where it is connected to the panel 1 and the bottom plate 2 (see Fig.18), in the assembled state, the first circular notch 19 forms a first crescent hole 20 with the inner walls of the panel 1 and the bottom plate 2 (see Figure 6 The second transverse beam 16 is provided with a second circular notch 21 on the side where it is connected to the panel 1 and the bottom plate 2 (see Fig. 20 ), in the assembled state, the second notch 21 forms a second crescent hole 22 between the inner wall of the panel 1 and the bottom plate 2 (see Figure 8 ).

[0061] An upper reinforcement plate 17 (see Figure 6 ), a sound column 5 is provided at the intersection of the first groove 8 and the second groove 9 (see Figure 4 ), the sound column 5 is a supporting column structure, one end of the sound column 5 is supported on the panel 1, and the other end is supported on the bottom plate 2 (see Figure 6 The first groove 8 and the second groove 9 are both arc-shaped grooves (see Figure 7 ).

[0062] Embodiment 2: A double-beam Liuqin (double-sided double-beam structure)

[0063] The difference between Example 2 and Example 1 is that the bottom plate 2 of Example 1 is a thick plate, and the inner wall of the bottom plate 2 is not provided with double beams and groove structures, while the bottom plate of Example 2 is a thin plate, and the inner wall of the bottom plate 2 is provided with double beams and groove structures. The specific contents are as follows:

[0064] like Figure 9-13 , Fig.16 , Fig.17 As shown in FIG. 1 , two lower sound beams 7 (see FIG. 1 ) are provided in the resonance box. Fig.10 and Fig.11 ), the lower sound beam 7 is a long sound beam component (see Fig.16 and Fig.17 ), one side of the two lower sound beams 7 is closely fixed to the inner wall of the bottom plate 2, and the other side of the two lower sound beams 7 is suspended in the resonance box relative to the panel 1 (see Fig.11 ), the length direction of the two lower sound beams 7 is consistent with the length direction of the resonance box (see Fig.10 ), in the width direction of the resonance box, the two lower sound beams 7 are parallel and spaced apart (see Fig.11 The lower sound beam 7 is provided with a lower bridge hole 13 (see Fig.16 ), the lower bridge hole 13 is a hole on one side of the lower sound beam 7 and makes the lower sound beam 7 form a lower bridge type sound beam structure, and the lower bridge hole 13 is mounted on the third groove 10.

[0065] Two third grooves 10 are provided on the inner wall of the bottom plate 2 of the resonance box (see Fig.10), the two third grooves 10 are both opened along the width direction of the resonance box, and the two third grooves 10 are arranged at intervals in the length direction of the resonance box. A fourth groove 11 is provided on the inner wall of the bottom plate 2 of the resonance box (see Fig.12 ), the fourth groove 11 is opened along the length direction of the resonance box, and the fourth groove 11 is located at the center in the width direction of the resonance box. The two third grooves 10 and the fourth groove 11 intersect and penetrate each other on the inner wall of the bottom plate 2, wherein the fourth groove 11 is located between the two lower sound beams 7 (see Fig.11 ), the length direction of the fourth groove 11 is consistent with the length direction of the lower sound beam 7. The two third grooves 10 span the two lower sound beams 7 in the width direction of the resonance box and form two lower transverse sound tunnels on the inner wall of the bottom plate 2, and the fourth groove 11 forms a lower longitudinal sound tunnel on the inner wall of the bottom plate 2.

[0066] The length of the third groove 10 is less than the length of the bottom plate 2 in the resonance box at the position corresponding to the third groove 10, and smooth transition surfaces are provided between the two ends of the third groove 10 and the inner wall of the bottom plate 2. The length of the fourth groove 11 is less than the length of the bottom plate 2 in the resonance box at the position corresponding to the fourth groove 11, and smooth transition surfaces are provided between the two ends of the fourth groove 11 and the inner wall of the bottom plate 2.

[0067] A lower reinforcing plate 18 (see Fig.11 ). The third groove 10 and the fourth groove 11 are both arc-shaped grooves.

[0068] The other contents of Example 2 are the same as those of Example 1 and will not be described again here.

[0069] The following is an explanation of other implementations and structural changes of the present invention:

[0070] 1. In the above embodiment, the two upper beams 6 are parallel and juxtaposed in the width direction of the resonance box (see Figure 6 ). The two lower beams 7 are parallel and juxtaposed (see Fig.11 ). However, the present invention is not limited thereto, and the two upper sound beams 6 do not necessarily have to be parallel, and the two lower sound beams 7 do not necessarily have to be parallel, but parallel arrangement is optimal, which is easily understood and accepted by those skilled in the art.

[0071] 2. In the above embodiments, a double beam structure is provided on the inner wall of the panel 1 and the bottom plate 2. That is, two upper beams 6 are provided on the panel 1, and two lower beams 7 are provided on the bottom plate 2. However, the present invention is not limited thereto, and the two upper beams 6 can be changed in form to four upper beams 6 used in parallel. For the present invention, although the four upper beams 6 and the two upper beams 6 are different in number and form, they are essentially the same. Assuming that the two outer beams of the four upper beams 6 are close to the two inner beams, it can be equivalent to a double beam. Therefore, it can be considered that this change does not bring unexpected effects and should be understood as substantially equivalent. Similarly, the double beam structure on the bottom plate 2 should also include such a change. In the present invention, the double beam includes the meaning of symmetrical arrangement of even-numbered beams, so the symmetrical arrangement of six beams is also an equivalent change of the present invention. This is easy to understand for those skilled in the art.

[0072] 3. In the above embodiment, two first grooves 8 are provided on the inner wall of the panel 1 (see Figure 4 ), two third grooves 10 are provided on the inner wall of the bottom plate 2 (see Fig.10 ). However, the present invention is not limited thereto, and the number of the first groove 8 and the third groove 10 can be one, three, four or five, etc. Such changes can be determined according to actual conditions. In essence, the number of the first groove 8 and the third groove 10 is at least one.

[0073] 4. In the above embodiment, the two first transverse beams 15 and the two second transverse beams 16 (see Figure 4 and Fig. 9 The two first transverse beams 15 and the two second transverse beams 16 are both bilaterally symmetrical with respect to the center plane of the second groove 9 (see Figure 4 and Fig. 9 ) However, the present invention is not limited to this. The two first transverse sound beams 15 can be connected to each other and combined into one first transverse sound beam 15, and the two second transverse sound beams 16 can be connected to each other and combined into one second transverse sound beam 16, which is easily understood and accepted by those skilled in the art.

[0074] 5. In the above embodiment, an upper bridge hole 12 is provided on the upper sound beam 6, and a lower bridge hole 13 is provided on the lower sound beam 7. However, the present invention is not limited thereto, and the upper bridge hole 12 and the lower bridge hole 13 may not be provided, or even only one of the upper sound beam 6 and the lower sound beam 7 may be provided with a bridge hole. This is easily understood and accepted by those skilled in the art.

[0075] 6. In the above embodiment, an upper reinforcing plate 17 is fixedly mounted between the two upper sound beams 6 (see Figure 6 ), a lower reinforcement plate 18 is fixedly mounted between the two lower sound beams 7 (see Fig.11). However, the present invention is not limited thereto, and the upper reinforcing plate 17 may not be provided, and the two upper sound beams 6 may be suspended in the resonance box. Similarly, the lower reinforcing plate 18 may not be provided, and the two lower sound beams 7 may be suspended in the resonance box. The upper reinforcing plate 17 and the lower reinforcing plate 18 may increase the strength of the middle area of ​​the front panel and the back panel, especially between the upper sound beams and between the lower sound beams, and may increase the load when the two upper sound beams and the two lower sound beams resonate.

[0076] 7. In the above embodiments, the first groove 8, the second groove 9, the third groove 10 and the fourth groove 11 are all arc-shaped grooves. However, the present invention is not limited thereto, and the grooves can be designed into other shapes, such as V-shaped, U-shaped, W-shaped and other concave structures. This is easily understood and accepted by those skilled in the art.

[0077] 8. In the above embodiment 2, from the cross section of the resonance box, the two lower sound beams 7 and the two upper sound beams 6 are arranged in a corresponding position in the vertical direction (see Fig.11 ). However, the present invention is not limited thereto, and the arrangement may not be aligned, but the alignment arrangement has the best effect. This is easily understood and accepted by those skilled in the art.

[0078] 9. In the above embodiment, the two upper sound beams 6 have the same shape and size (see Fig.14 The two lower sound beams 7 have the same shape and size (see Fig.16 ). However, the present invention is not limited thereto, and the shapes and sizes of the two upper sound beams 6 may be different, and the shapes and sizes of the two lower sound beams 7 may also be different. Specifically, it can be determined when the resonance box is debugging the timbre and sound quality. This is easily understood and accepted by those skilled in the art.

[0079] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-beam liuqin, comprising a resonance box, the body of which is composed of a panel (1) and a bottom plate (2), characterized in that: Two upper sound beams (6) are arranged in the resonance box, the upper sound beams (6) being long strip-shaped sound beam components, one side of the two upper sound beams (6) being closely fixed to the inner wall of the panel (1), one side of the two upper sound beams (6) being suspended in the resonance box relative to the bottom plate (2), the length direction of the two upper sound beams (6) being consistent with the length direction of the resonance box, and the two upper sound beams (6) being arranged side by side and spaced a certain distance apart in the width direction of the resonance box; A first groove (8) is provided on the inner wall of the panel (1) of the resonance box, and the first groove (8) is opened along the width direction of the resonance box; a second groove (9) is provided on the inner wall of the panel (1) of the resonance box, and the second groove (9) is opened along the length direction of the resonance box; the first groove (8) and the second groove (9) are cross-arranged on the inner wall of the panel (1) and are interconnected, wherein the second groove (9) is located between the two upper sound beams (6), and the length direction of the second groove (9) is consistent with the length direction of the upper sound beam (6); the first groove (8) spans the two upper sound beams (6) in the width direction of the resonance box and forms an upper transverse sound tunnel on the inner wall of the panel (1), and the second groove (9) forms an upper longitudinal sound tunnel on the inner wall of the panel (1); A transverse sound beam is provided in the resonance box, and the transverse sound beam is in the shape of a plate, wherein the transverse sound beam is arranged at the position of the first groove (8) and is bilaterally symmetrical with respect to the central plane of the second groove (9), the top of the transverse sound beam is fixedly connected to the panel (1), and the bottom of the transverse sound beam is fixedly connected to the bottom plate (2).

2. The Liuqin according to claim 1, characterized in that: Two lower sound beams (7) are arranged in the resonance box, the lower sound beams (7) being long strip-shaped sound beam components, one side of the two lower sound beams (7) being closely fixed to the inner wall of the bottom plate (2), the other side of the two lower sound beams (7) being suspended in the resonance box relative to the panel (1), the length direction of the two lower sound beams (7) being consistent with the length direction of the resonance box, and the two lower sound beams (7) being arranged side by side and spaced a certain distance apart in the width direction of the resonance box; A third groove (10) is provided on the inner wall of the bottom plate (2) of the resonance box, and the third groove (10) is opened along the width direction of the resonance box; a fourth groove (11) is provided on the inner wall of the bottom plate (2) of the resonance box, and the fourth groove (11) is opened along the length direction of the resonance box; the third groove (10) and the fourth groove (11) are arranged crosswise on the inner wall of the bottom plate (2) and are interconnected, wherein the fourth groove (11) is located between the two lower sound beams (7), and the length direction of the fourth groove (11) is consistent with the length direction of the lower sound beam (7); the third groove (10) spans the two lower sound beams (7) in the width direction of the resonance box and forms a lower transverse sound tunnel on the inner wall of the bottom plate (2), and the fourth groove (11) forms a lower longitudinal sound tunnel on the inner wall of the bottom plate (2).

3. The Liuqin according to claim 2, characterized in that: An upper bridge hole (12) is provided on the upper sound beam (6), the upper bridge hole (12) is a hole on one side of the upper sound beam (6) and enables the upper sound beam (6) to form an upper bridge type sound beam structure, and the upper bridge hole (12) is mounted on the first groove (8); The lower sound beam (7) is provided with a lower bridge hole (13), the lower bridge hole (13) is a hole on one side of the lower sound beam (7) so that the lower sound beam (7) forms a lower bridge type sound beam structure, and the lower bridge hole (13) is mounted on the third groove (10).

4. The Liuqin according to claim 2, characterized in that: An upper reinforcing plate (17) is fixedly mounted between the two upper sound beams (6), and a lower reinforcing plate (18) is fixedly mounted between the two lower sound beams (7).

5. The Liuqin according to claim 1, characterized in that: The length of the first groove (8) is smaller than the length of the panel (1) in the resonance box at a position corresponding to the first groove (8), and smooth transition surfaces are provided between the two ends of the first groove (8) and the inner wall of the panel (1); the length of the second groove (9) is smaller than the length of the panel (1) in the resonance box at a position corresponding to the second groove (9), and smooth transition surfaces are provided between the two ends of the second groove (9) and the inner wall of the panel (1).

6. The Liuqin according to claim 2, characterized in that: The length of the third groove (10) is smaller than the length of the bottom plate (2) in the resonance box at a position corresponding to the third groove (10), and smooth transition surfaces are provided between the two ends of the third groove (10) and the inner wall of the bottom plate (2); the length of the fourth groove (11) is smaller than the length of the bottom plate (2) in the resonance box at a position corresponding to the fourth groove (11), and smooth transition surfaces are provided between the two ends of the fourth groove (11) and the inner wall of the bottom plate (2).

7. The Liuqin according to claim 1, characterized in that: The transverse sound beam is arranged in the horizontal direction in the resonance box, and a through hole is opened in the center of the transverse sound beam; a circular notch is provided on the side where the transverse sound beam is connected to the panel (1) and the bottom plate (2), and a crescent hole is formed between the circular notch and the inner wall of the panel (1) and the bottom plate (2) in the assembled state.

8. The Liuqin according to claim 1, characterized in that: A sound column (5) is provided at a position where the first groove (8) and the second groove (9) intersect. The sound column (5) is a supporting column structure. One end of the sound column (5) is supported on the panel (1), and the other end is supported on the bottom plate (2).

9. The Liuqin according to claim 2, characterized in that: The first groove (8), the second groove (9), the third groove (10) and the fourth groove (11) are all arc-shaped grooves.

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