CN111951762A - A two-tone beam liuqin - Google Patents

Abstract

A double-sound beam liuqin includes a resonance box, the box body of which is formed by assembling a panel and a bottom plate, and is characterized in that: two upper sound beams are fixed side by side on the inner wall of the panel; Longitudinal grooves, and the transverse grooves and the longitudinal grooves penetrate each other 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 combine to connect the inner wall of the panel to the corresponding sound beam. The space is divided into six resonance zones. This scheme breaks the shackles of the traditional design of the internal structure of the liuqin resonance box, and boldly proposes a new and improved design scheme, which solves the problem that the liuqin could not take into account the high, medium and low frequency regions at the same time with good resonance tone and penetrating power. The penetrating power (small attenuation, far transmission) is greatly enhanced, the high-pitched area is bright and rigid, the mid-range is soft and moist, and the low-frequency sound is more pure.

Description

A two-tone beam liuqin

technical field

The invention relates to a traditional Chinese plucked musical instrument, in particular to a two-tone beam liuqin.

Background technique

Liuqin, also known as Liuyeqin, Diamond Legs, and Earth Pipa, is a traditional Chinese plucked musical instrument. 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 one of the pear-shaped speaker stringed instruments that have been circulating among the people since the Tang Dynasty. Its shape, structure and playing method are similar to those of Ruan.

Today, liuqin plays various roles in the field of Chinese music performance. In the national band, the liuqin is a high-pitched instrument in the plucked instrument group. It has a unique sound effect and often plays an important theme in the high-pitched area. Because its timbre is not easy to be concealed and integrated by other instruments, it is sometimes used for the performance of highly skilled cadenza passages. In addition, the liuqin also has the sound effect of the Western musical instrument mandolin, which is unique in cooperation with Western bands.

Liuqin is composed of headstock, piano shaft, panel, sound window, mountain pass, piano fret, piano code, fine adjustment, bottom plate (back plate) and other parts. The tuning of Liuqin is generally the tuning method of fixed pitch. The first string, also called the sub-string, is tuned with the second group of small characters d; the second string, also called the middle string, is tuned with the small group of g; It is called Lixian, and the tuning is the d of the small group; the four strings, also called winding strings, the tuning is the g of the small group. Liuqin is small in style, bright in tone and wide in range. At the beginning, it was made of Chaoyang wood at the bottom of the willow tree and was shaped like a willow leaf, so people called it "liuqin" or "liuyeqin".

The current shortcomings of Liuqin are: compared with the midrange, the timbre of the treble and bass regions needs to be improved, the treble region is not bright, and the bass region is not thick and round enough, and the penetration of the piano 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-pitched region to the low-pitched region, that is, it cannot simultaneously adapt to the resonance and vibration of wide frequency changes in the high-pitched, mid-range and bass regions. Further research shows that there are many factors affecting resonance and vibration in the resonance box. Except for the material and thickness of the panel and bottom plate, the internal structure and structure of the resonance box have a greater impact. However, the design of the existing liuqin resonance box is unreasonable, which is not conducive to the sound wave resonance and vibration of the resonance box from the high-pitched area to the low-frequency area.

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

SUMMARY OF THE INVENTION

The present invention provides a two-tone beam liuqin, the purpose of which is to solve the problem that the existing liuqin resonance box cannot take into account the high, middle and low frequency regions and simultaneously have good resonance tone and penetrating power.

In order to achieve the above purpose, the technical solution adopted in the present invention is: a double-tone beam liuqin, comprising a resonance box, the box body of the resonance box is assembled by a panel and a bottom plate, and the innovation lies in:

Two upper sound beams are arranged in the resonance box, and the upper sound beams are elongated sound beam members. One side of the two upper sound beams is closely fixed on the inner wall of the panel, and one side of the two upper sound beams Relative to the bottom plate suspended in the resonance box, the length direction of the two upper sound beams is consistent with the length direction of the resonance box, and the two upper sound beams are juxtaposed and separated by a distance from the width direction of the resonance box.

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 along the resonance box. The length direction of the box is opened; the first groove and the second groove are arranged crosswise on the inner wall of the panel and pass through each other, wherein the second groove is located between the two upper sound beams, and the length direction of the second groove is the same as that of the two upper sound beams. The length directions of the upper sound beams are the same; the first groove spans the two upper sound beams in the width direction of the resonant 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 sound tunnel.

The relevant contents in the above technical solutions are explained as follows:

1. In the above scheme, the theme is "Liuqin", and the innovation is focused on the "resonance box" of Liuqin, so no other structures and structures other than the resonance box are described. It can be considered that the other structures except the resonance box in the liuqin of the present invention are realized by using the prior art.

2. In the above solution, the "sound box" refers to a sound box formed by combining the front panel and the bottom panel (back panel). The length direction of the liuqin resonance box refers to the direction approximately in line with the strings, and the width direction of the resonance box is the direction perpendicular to the length direction. The "inner wall" refers to the inner wall surface for the resonance box. For example, the inner wall of the panel refers to the wall surface close to the inner side of the panel of the resonance box, and the inner wall of the bottom plate refers to the wall surface close to the inner side of the bottom plate of the resonance box.

3. in the above-mentioned scheme, can be provided with two lower sound beams in the resonant box, the lower sound beams are elongated sound beam components, and one side of the two lower sound beams is closely fixed on the inner wall of the bottom plate. Up, the other side of the two lower bracing is suspended in the resonance box relative to the panel, the length direction of the two lower bracing is consistent with the length direction of the resonance box, and the two lower bracing are juxtaposed in the width direction of the resonance box. and separated by a distance.

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; The length direction of the box is opened; the third groove and the fourth groove are arranged crosswise on the inner wall of the bottom plate and pass through each other, 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 beam; the third groove spans the two lower sound beams in the width direction of the resonance box, and forms a lower transverse sound tunnel on the inner wall of the bottom plate, and the fourth groove is formed on the inner wall of the bottom plate. Down the vertical sound tunnel.

4. In the above-mentioned scheme, a transverse sound beam can be provided in the resonant 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, and the center plane of the second groove is used. The top of the sound beam is fixedly connected with the panel, and the bottom of the sound beam is fixedly connected with the bottom plate.

5. In the above scheme, an upper bridge hole can be provided on the upper sound beam, and the upper bridge hole is a hole on one side of the upper sound beam and makes the upper sound beam form an upper bridge type sound beam structure, and the upper bridge hole is erected in the first groove. superior. 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 the lower sound beam forms a lower bridge sound beam structure, and the lower bridge hole is erected on the third groove.

6. In the above solution, an upper reinforcing plate can be fixedly framed between the two upper sound beams, or a lower reinforcing plate can be fixedly framed between the two lower sound beams.

7. In the above-mentioned scheme, the sound beam is arranged on the lateral direction in the resonance box, and the center of the sound beam is provided with a through hole; the side of the sound beam connecting with the panel and the bottom plate is provided with a circular gap, and the sound beam is assembled. In the state, a moon bud hole is formed between the round hole and the inner wall of the panel and the bottom plate.

8. In the above solution, it is best that the first groove, the second groove, the third groove and the fourth groove are arc-shaped grooves.

The design principle and concept of the present invention are as follows: for the liuqin, there are many factors affecting its timbre and penetrating power, such as the material, thickness, internal structure and the like 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 regions and have good resonance tone and penetrating power at the same time, the present invention thoroughly improves it mainly from the perspective of the internal structure of the resonance chamber. It is embodied in the following aspects: first, two upper sound beams are fixed and arranged side by side on the inner wall of the panel in the resonance chamber; second, grooves (that is, the first groove and the second grooves), which form upper transverse sound tunnels and upper longitudinal sound tunnels on the inner wall of the panel. Aiming at the problem that the high-pitched area of the existing liuqin cannot be bright, and the low-pitched area is not rich and round enough, the present invention deeply discusses and studies the resonance box of the liuqin, especially the structure of the resonance chamber and the sounding mechanism, and finds out the high-pitched area of the existing liuqin. The main reason for the poor timbre and penetrating power in the low and low range is due to the unreasonable design of the resonant box, especially the resonant cavity, which leads to the inability of sound waves to resonate and vibrate well in the resonant cavity during performance. Accordingly, the inventor breaks the constraints of the traditional design of the liuqin resonance box (especially the resonance chamber), and boldly proposes an improved design scheme of the present invention, which solves the problem of the high-pitched area of the liuqin from the perspective of sound wave transmission, vibration, resonance and sound production. It does not come out, and the bass area is not thick and round enough. Practice has proved that the improved design has outstanding substantive features and significant technological progress, which greatly enhances the penetrating power of the liuqin sound (small attenuation and long transmission), and the treble area is greatly enhanced. Bright and rigid, the midrange is soft and mellow, and the bass is more solid.

Due to the application of the above-mentioned technical solutions, the present invention has the following advantages and effects compared with the existing zither resonance box (the best embodiment, that is, the content of the embodiment of the present invention will be described):

1. The present invention is provided with a double sound beam structure in the center of the panel (that is, two upper sound beams are arranged side by side on the inner wall of the panel). Because the bass has a large amplitude and a low frequency relative to the treble, the bass resonance is concentrated in the central area of the resonant box, and the treble resonance is high. Concentrating on the surrounding edge area of the resonance box, it strengthens the strength of the central area of the panel, which plays an important role in improving the tone and penetration of the bass region. On the other hand, the strength of the central area of the panel is strengthened, relatively speaking, the thickness gap between the central area of the resonance box and the surrounding edge area is changed, which also has a good effect on improving the tone and penetration of the high-pitched area.

2. In the present invention, grooves (ie, the first groove and the second groove) are provided on the inner wall of the panel, and the grooves penetrate each other on the inner wall of the panel to actually form a longitudinal sound tunnel and a transverse sound tunnel. These sound tunnels form a tunnel for sound wave transmission in the resonant cavity. 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 area of the resonance box. When the strings vibrate by It is collected in the central area and quickly transmitted around the resonant cavity through the sound tunnel (that is, the sound tunnel), which plays a key role in improving the timbre and penetration of the high-pitched area and the timbre and penetration of the low-frequency area. good effect.

3. In the present invention, the sound beam is designed 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 transmit vibration through the sound tunnel, and it is also more conducive to the resonance of the resonance box.

4. The present invention adopts the design of the bracing beams (the first bracing beam and the second bracing bracing), and these bracing beams and the two upper bracing beams combine to divide the space corresponding to the inner wall of the panel into six parts under the top view of the resonance box. a resonance area. When there is a lower sound beam on the inner wall of the bottom plate, the combination of the transverse sound beam (the first transverse sound beam and the second transverse sound beam) and the two lower sound beams divide the space corresponding to the inner wall of the bottom plate into six resonance areas, a total of twelve a resonance area. When the liuqin is played, the vibration of the strings is first transmitted to the central area of the resonance chamber, and then transmitted to the 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, the liuqin can only generate five sound waves when playing, that is, two bracings divide the resonance cavity into three resonance areas, each resonance area generates one sound wave, plus a sine wave, plus a percussion wave. volume, a total of five sound wave volumes. After the improvement, the single-sided double-tone beam liuqin of the present invention can generate eight sound waves, wherein, six resonance regions generate six sound waves, plus one sine wave, plus one firing wave, a total of eight sound waves quantity. The double-sided double-tone beam liuqin can generate fourteen sound waves when playing, among which, twelve resonance areas generate twelve sound waves, plus one sine wave, and one firing wave, for a total of fourteen. volume of sound. The volume of sound waves is the number of sound waves. For the plucked and plucked instruments of a specific resonance box, in addition to a string wave volume and a firing wave volume, it mainly depends on the number of resonance areas in the resonance box. Each resonance area generates one sound wave volume, and as many resonance areas generate as many sound wave volumes. In addition, the amount of sound waves directly affects the timbre, penetration, and volume of the instrument. Therefore, the design of the present invention can obviously improve the timbre of the high-pitched and low-pitched regions, and increase the penetration and volume of the high-pitched and low-pitched regions.

5. The through hole on the beam of the present invention and the moon bud hole between the beam and the panel and the bottom plate are the channels between each resonance area in the resonance cavity, and this channel design is conducive to the mutual transmission of sound waves, resonance and vibration. .

6. In the present invention, the upper reinforcing plate is fixedly erected between the two upper sound beams, and the lower reinforcing plate is fixedly erected between the two lower sound beams. The first function is to increase the middle area of the panel and the bottom plate, especially between the upper sound beams and the lower reinforcing plate. The strength between the sound beams, the second is to increase the load when the two upper sound beams and the two lower sound beams resonate, which further improves the tone and penetration of the bass area, and on the other hand strengthens the central area of the resonance box. Relatively speaking, it also widens the intensity gap with the edge area around the resonance box, which is also conducive to improving the tone and penetration of the high-pitched area.

7. The first groove, the second groove, the third groove and the fourth groove of the present invention all use arc grooves, which can make the thickness of the panel and the bottom plate to minimize the sudden change in thickness, which affects the resonance and sound of the resonance box. vibration.

The above advantages and effects are described in the best way. However, it should be emphasized that for the present invention, the measures of setting a double sound beam structure and opening grooves on the inner wall of the panel are more important than the equivalent measures on the inner wall of the bottom plate, and the effect and effect are relatively better. The reason is that there are strings on the top plate, and the bottom plate is not directly connected to the strings. Therefore, the key to solving the technical problem of the present invention is to set the double-sound beam structure and open the grooves on the inner wall of the panel, and to set the double-sound beam structure and open the grooves on the inner wall of the bottom plate is the icing on the cake for the present invention, which is a skill in the art. Easy for people to understand.

Description of drawings

Accompanying drawing 1 is the front view of existing liuqin;

Accompanying drawing 2 is the left side view of existing liuqin;

Accompanying drawing 3 is A-A sectional view of FIG. 1;

Accompanying drawing 4 is the front structure schematic diagram of Liuqin of Embodiment 1 of the present invention;

Accompanying drawing 5 is the left side view of liuqin of embodiment 1 of the present invention;

Accompanying drawing 6 is the B-B sectional view of FIG. 4;

7 is a cross-sectional view of the resonance box body in FIG. 6;

Accompanying drawing 8 is the C-C sectional view of FIG. 4;

Accompanying drawing 9 is the front view structure schematic diagram of liuqin of Embodiment 2 of the present invention;

Accompanying drawing 10 is the left side view of liuqin of embodiment 2 of the present invention;

Accompanying drawing 11 is the D-D sectional view of FIG. 9;

Figure 12 is a cross-sectional view of the resonance box in Figure 11;

Accompanying drawing 13 is the E-E sectional view of FIG. 9;

14 is a front view of the upper bracing in Embodiment 1 and Embodiment 2 of the present invention;

15 is a left side view of the upper bracing in Embodiment 1 and Embodiment 2 of the present invention;

16 is a front view of the lower bracing in Embodiment 2 of the present invention;

17 is a left side view of the lower bracing in Embodiment 2 of the present invention;

18 is a front view of the first transverse bracing in Embodiment 1 and Embodiment 2 of the present invention;

19 is a left side view of the first transverse bracing in Embodiment 1 and Embodiment 2 of the present invention;

20 is a front view of the second sound beam in Embodiment 1 and Embodiment 2 of the present invention;

FIG. 21 is a left side view of the second sound beam in Embodiment 1 and Embodiment 2 of the present invention.

In the above drawings: 1. panel; 2. Bottom plate; 3. Sound beam; 4. Eight-character sound beam; 5. Sound column; 6. 7. Upper sound beam; Lower sound beam; 8. 9. The first groove; 10. The second groove; The third groove; 11. The fourth groove; 12. Shangqiao Cave; 13. Xiaqiao Cave; 14. 15. Sound hole; 16. The first transverse sound beam; 17. The second transverse beam; 18. Upper reinforcing plate; 19. Lower reinforcing plate; 20. The first round is missing; 21. Bud hole in the first month; 22. The second round is missing; 23. Bud hole in the second month; 24. The first through hole; second through hole.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the present invention is further described:

Embodiment 1: A kind of double-sound beam liuqin (single-sided double-sound beam structure)

Since the innovation of the present invention is concentrated on the resonance box, this embodiment will focus on describing the structure and structure of the liuqin resonance box, and other structures related to the liuqin can be considered to be realized by the existing technology, and will not be described in this embodiment. Details.

The structure and structure of the liuqin resonance box in this embodiment: as shown in Figure 4-Figure 8, Figure 14, Figure 15, Figure 18-Figure 21, the box body of the resonance box is formed by combining the panel 1 and the bottom plate 2 (see Figure 1). 5-figure 8).

There are two upper sound beams 6 (see FIGS. 4 and 6 ) in the resonance box, and the upper sound beam 6 is a long sound beam member (see FIGS. 14 and 15 ). One of the two upper sound beams 6 The sides are closely fixed on the inner wall of the panel 1, and the other sides of the two upper sound beams 6 are 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 the same as the length of the resonance box. The directions are the same (see Fig. 4), and the two upper sound beams 6 are parallel and juxtaposed in the width direction of the resonance box (see Fig. 6). The upper sound beam 6 is provided with an upper bridge hole 12 (see FIG. 14 ), and 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 sound beam structure, and the upper bridge hole 12 is erected. on the first trench 8 .

Two first grooves 8 (see FIG. 4 ) are provided on the inner wall of the panel 1 of the resonance box. The two first grooves 8 are opened along the width direction of the resonance box, and the two first grooves 8 are located in the width direction of the resonance box. The sound boxes are spaced apart in the length direction. A second groove 9 (see FIG. 4 ) is provided on the inner wall of the panel 1 of the resonance box, the second groove 9 is opened along the length direction of the resonance box, and the second groove 9 is located in the width direction of the resonance box. Central location. Two first grooves 8 and one second groove 9 cross and penetrate each other on the inner wall of the panel 1 (see FIG. 7 ). The longitudinal direction of the groove 9 is the same as the longitudinal direction of the upper bracing 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 FIG. 4 ). The second groove 9 is located on the panel 1 . The upper longitudinal sound tunnel is formed on the inner wall (see Figure 4).

The length of the first groove 8 is smaller than the length of the inner panel 1 of the resonance box at the corresponding position of the first groove 8 (see FIG. 4 ). Both ends of the first groove 8 and the inner wall of the panel 1 are provided with Smooth transition surfaces. The length of the second groove 9 is less than the length of the inner panel 1 of the resonance box at the corresponding position of the second groove 9 (see FIG. 4 ). Smooth transitions are provided between both ends of the second groove 9 and the inner wall of the panel 1 noodle.

A first transverse sound beam 15 and a second transverse sound beam 16 (see FIG. 4 ) are arranged in the resonance box. The first transverse sound beam 15 and the second transverse sound beam 16 are both plate-shaped. The first sound beam 15 is arranged at the position of a first groove 8, and is symmetrical to the left and right based on the center plane of the second groove 9 (see FIG. 4). The panel 1 is fixedly connected, and the bottom of the first sound beam 15 is fixedly connected to the bottom plate 2 (see FIG. 6 ). The two second sound beams 16 are arranged at the position of the other first groove 8 and are left-right symmetrical with the center plane of the second groove 9 as the reference (see FIG. 4 ). The top is fixedly connected to the panel 1 , and the bottom of the second sound beam 16 is fixedly connected to the bottom plate 2 (see FIG. 8 ). The first transverse sound beam 15 and the second transverse sound beam 16 are both arranged in the transverse direction in the resonance box, and a first through hole 23 (see FIG. 18 ) is opened in the center of the first transverse sound beam 15 . A second through hole 24 is formed in the center of the second transverse beam 16 (see FIG. 20 ). A first round notch 19 (see FIG. 18 ) is provided on the side where the first sound beam 15 is connected to the panel 1 and the bottom plate 2 . In the assembled state, the first round notch 19 is between the inner wall of the panel 1 and the bottom plate 2 . The first lunar bud hole 20 is formed (see Figure 6). A second round cutout 21 (see FIG. 20 ) is provided on the side where the second sound beam 16 is connected to the panel 1 and the bottom plate 2 . In the assembled state, the second round cut 21 is between the inner wall of the panel 1 and the bottom plate 2 . The second moon bud hole 22 is formed (see Figure 8).

An upper reinforcing plate 17 (see FIG. 6 ) is fixed between the two upper sound beams 6 , and a sound column 5 (see FIG. 4 ) is arranged at the intersection of the first groove 8 and the second groove 9 . The 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 grooves 8 and the second grooves 9 are arc-shaped grooves (see FIG. 7 ).

Embodiment 2: a kind of double-sound beam liuqin (double-sound double-sound beam structure)

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 sound beams and groove structures, while the bottom plate of Example 2 is a thin plate, and the bottom plate is The inner wall of 2 is provided with a double sound beam and a groove structure. The details are as follows:

As shown in Fig. 9-Fig. 13, Fig. 16, Fig. 17, there are two lower sound beams 7 (see Fig. 10 and Fig. 11) in the resonance box, and the lower sound beam 7 is a long sound beam components (see Figure 16 and Figure 17), one side of the two lower sound beams 7 is closely fixed on 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 Figure 11), the length direction of the two lower sound beams 7 is consistent with the length direction of the resonance box (see Figure 10), and the two lower sound beams 7 are parallel and juxtaposed in the width direction of the resonance box and separated by a certain distance (see Figure 10). Figure 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 sound beam structure. on the third groove 10 .

Two third grooves 10 (see FIG. 10 ) are provided on the inner wall of the bottom plate 2 of the resonance box, the two third grooves 10 are both opened along the width direction of the resonance box, and the two third grooves 10 are located in the width direction of the resonance box. The sound boxes are spaced apart in the length direction. A fourth groove 11 (see FIG. 12 ) is provided on the inner wall of the bottom plate 2 of the resonance box. The fourth groove 11 is opened along the length direction of the resonance box, and the fourth groove 11 is located in the width direction of the resonance box. Central location. Two third grooves 10 and one fourth groove 11 intersect on the inner wall of the bottom plate 2 and penetrate each other, wherein the fourth groove 11 is located between the two lower sound beams 7 (see FIG. 11 ). The longitudinal direction of the four grooves 11 coincides with the longitudinal direction of the lower bracing 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 is formed on the inner wall of the bottom plate 2 . Down the vertical sound tunnel.

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

A lower reinforcing plate 18 is fixed between the two lower sound beams 7 (see FIG. 11 ). The third groove 10 and the fourth groove 11 are arc-shaped grooves.

The other contents of Embodiment 2 are the same as those of Embodiment 1, and the description will not be repeated here.

The following descriptions are made for other implementations of the present invention and structural changes:

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

2. In the above embodiments, the inner walls of the panel 1 and the bottom panel 2 are both provided with a double sound beam structure. That is, two upper sound beams 6 are arranged on the panel 1 , and two lower sound beams 7 are arranged on the bottom plate 2 . However, the present invention is not limited to this, and two upper bracing beams 6 can be changed in form to four upper bracing beams 6 used in parallel. For the present invention, although the number and form of the four upper bracing beams 6 and the two upper bracing beams 6 are different, their essence is the same. Assuming that the two outer bracings of the four upper bracings 6 are close to the two inner bracings, it can be equivalent to two bracings. Therefore, it can be considered that this change does not bring unexpected effects, and should be understood as substantially equivalent. Similarly, the double-sound beam structure on the bottom plate 2 should also include such changes. In the present invention, the double-sound beams include the meaning of the symmetrical arrangement of the double-sound beams, so the symmetrical arrangement of the six-sound beams is also an equivalent variation of the present invention. This is easily understood by those skilled in the art.

3. In the above embodiment, the inner wall of the panel 1 is provided with two first grooves 8 (see FIG. 4 ), and the inner wall of the bottom plate 2 is provided with two third grooves 10 (see FIG. 10 ). However, the present invention is not limited thereto, and the number of the first grooves 8 and the third grooves 10 may be one, three, four or five, etc. Such changes can be determined according to the actual situation. Essentially, the number of the first trench 8 and the third trench 10 is at least one.

4. In the above embodiment, there are two first beams 15 and two second beams 16 (see FIGS. 4 and 9 ). The two first transverse sound beams 15 and the two second transverse sound beams 16 are both symmetrical with respect to the center plane of the second groove 9 (see FIGS. 4 and 9 ), but the present invention is not limited to this. The first bracing beam 15 can be combined into a first bracing beam 15 by connecting with each other, and two second bracing beams 16 can also be combined into a second bracing beam 16 by connecting with each other, which is easy for those skilled in the art. understood and accepted.

5. In the above embodiment, the upper sound beam 6 is provided with the upper bridge hole 12 , and the lower sound beam 7 is provided with the lower bridge hole 13 . However, the present invention is not limited to this, the upper bridge hole 12 or 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 is provided with a bridge hole. This is easily understood and accepted by those skilled in the art.

6. In the above embodiment, the upper reinforcing plate 17 is fixed between the two upper sound beams 6 (see FIG. 6 ), and the lower reinforcing plate 18 is fixed between the two lower sound beams 7 (see FIG. 11 ). However, the present invention is not limited to this, 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 can also be omitted, and the two lower sound beams 7 can be suspended in the resonance box. The upper reinforcing plate 17 and the lower reinforcing plate 18 can increase the strength of the middle area of the panel and the back plate, especially between the upper bracing and the lower bracing, and secondly, it can increase two upper bracing and two lower bracing. The load at which resonance occurs.

7. In the above embodiment, 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 to this, and the grooves can be designed into other shapes, such as concave structures such as V-shape, U-shape, and W-shape. This is easily understood and accepted by those skilled in the art.

8. In the above Embodiment 2, observed from the cross section of the resonance box, the two lower bracing beams 7 and the two upper bracing beams 6 are arranged correspondingly in the up-down direction (see FIG. 11 ). However, the present invention is not limited to this, 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.

9. In the above embodiment, the shape and size of the two upper sound beams 6 are the same (see FIG. 14 ). The shape and size of the two lower bracing 7 are the same (see Figure 16). However, the present invention is not limited to this, the shapes and sizes of the two upper bracing beams 6 may be different, and the shapes and sizes of the two lower bracing beams 7 may also be different. The specific can be determined according to the sound box debugging tone and sound quality. This is easily understood and accepted by those skilled in the art.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those who are familiar with the art to understand the content of the present invention and implement accordingly, and cannot limit the protection scope of the present invention by this. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a two sound roof beam liuqin, includes the resonant tank, and the box of this resonant tank is formed its characterized in that by panel (1) and bottom plate (2) amalgamation:

two upper sound beams (6) are arranged in the resonator, the upper sound beams (6) are long-strip-shaped sound beam components, one sides of the two upper sound beams (6) are tightly attached and fixed on the inner wall of the panel (1), one sides of the two upper sound beams (6) are suspended in the resonator relative to the bottom plate (2), the length directions of the two upper sound beams (6) are consistent with the length direction of the resonator, and the two upper sound beams (6) are parallel and separated by a certain distance when being seen in the width direction of the resonator;

a first groove (8) is formed in the inner wall of the panel (1) of the resonator, and the first groove (8) is formed in the width direction of the resonator; a second groove (9) is formed in the inner wall of the panel (1) of the resonator, and the second groove (9) is formed in the length direction of the resonator; the first groove (8) and the second groove (9) are arranged on the inner wall of the panel (1) in a crossed mode and are communicated with each other, 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 that of the upper sound beams (6); the first groove (8) stretches across the two upper sound beams (6) in the width direction of the resonator, an upper transverse sound tunnel is formed 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).

2. The liuqin of claim 1, wherein: two lower sound beams (7) are arranged in the resonator, the lower sound beams (7) are strip-shaped sound beam components, one sides of the two lower sound beams (7) are tightly attached and fixed on the inner wall of the bottom plate (2), the other sides of the two lower sound beams (7) are suspended in the resonator relative to the panel (1), the length directions of the two lower sound beams (7) are consistent with the length direction of the resonator, and the two lower sound beams (7) are parallel and are separated by a certain distance when being seen in the width direction of the resonator;

a third groove (10) is formed in the inner wall of the bottom plate (2) of the resonator, and the third groove (10) is formed in the width direction of the resonator; a fourth groove (11) is formed in the inner wall of the bottom plate (2) of the resonator, and the fourth groove (11) is formed in the length direction of the resonator; the third grooves (10) and the fourth grooves (11) are arranged on the inner wall of the bottom plate (2) in a crossed mode and are communicated with each other, the fourth grooves (11) are located between the two lower sound beams (7), and the length direction of the fourth grooves (11) is consistent with that of the lower sound beams (7); the third groove (10) stretches across two lower sound beams (7) in the width direction of the resonator, a lower transverse sound tunnel is formed on the inner wall of the bottom plate (2), and a lower longitudinal sound tunnel is formed on the inner wall of the bottom plate (2) by the fourth groove (11).

3. The liuqin of claim 1, wherein: the structure is characterized in that a transom beam is arranged in the resonator, the transom beam is in a plate shape, the transom beam is arranged at the position of the first groove (8) and is bilaterally symmetrical by taking the central plane of the second groove (9) as a reference, the top of the transom beam is fixedly connected with the panel (1), and the bottom of the transom beam is fixedly connected with the bottom plate (2).

4. The harp of claim 2, wherein: an upper bridge opening (12) is formed in the upper sound beam (6), the upper bridge opening (12) is a hole gap 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 opening (12) is erected on the first groove (8);

and a lower bridge opening (13) is formed in the lower sound beam (7), the lower bridge opening (13) is in a hole gap at one side of the lower sound beam (7) and enables the lower sound beam (7) to form a lower bridge type sound beam structure, and the lower bridge opening (13) is erected on the third groove (10).

5. The harp of claim 2, wherein: an upper reinforcing plate (17) is arranged on the fixing frame between the two upper sound beams (6), and a lower reinforcing plate (18) is arranged on the fixing frame between the two lower sound beams (7).

6. The liuqin of claim 1, wherein: the length of the first groove (8) is smaller than that of the panel (1) in the resonator at the corresponding position of the first groove (8), and smooth transition surfaces are arranged between 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 that of the panel (1) in the resonator at the corresponding position of the second groove (9), and smooth transition surfaces are arranged between the two ends of the second groove (9) and the inner wall of the panel (1).

7. The harp of claim 2, wherein: the length of the third groove (10) is smaller than that of the bottom plate (2) in the resonance box at the position corresponding to the third groove (10), and smooth transition surfaces are arranged 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 that of the corresponding position of the bottom plate (2) in the resonance box at the fourth groove (11), and smooth transition surfaces are arranged between the two ends of the fourth groove (11) and the inner wall of the bottom plate (2).

8. The liuqin of claim 3, wherein: the transom beam is arranged in the transverse direction in the resonance box, and a through hole is formed in the center of the transom beam; the side edge of the transom beam connected with the panel (1) and the bottom plate (2) is provided with a circular notch, and a crescent hole is formed between the circular notch and the inner walls of the panel (1) and the bottom plate (2) in an assembly state.

9. The liuqin of claim 1, wherein: the sound column (5) is arranged at the crossed position of the first groove (8) and the second groove (9), the sound column (5) is of a supporting column structure, one end of the sound column (5) is supported on the panel (1), and the other end of the sound column is supported on the bottom plate (2).

10. The harp of claim 2, wherein: 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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