An accordion sound changing system assembly

Abstract

The application discloses an accordion sound changing system assembly which comprises a sound control plate, a sound changer and a transmission aluminum box. The sound control plate comprises a main plate, a cover plate arranged at the bottom of the main plate and control sound transmission pieces arranged between the main plate and the cover plate. Eight grooves are formed at the bottom of the main plate, and one control sound transmission piece is arranged in each groove. A plurality of square sound holes are formed along each groove on the main plate. The sound changer comprises a bottom support, four layers of sound changing transmission pieces and a plurality of keys arranged on the bottom support. The relative positions of the four layers of sound changing transmission pieces can be changed by pressing different keys. A pull rod joint is arranged on the sound changing transmission pieces. The transmission aluminum box comprises an aluminum box body which is arranged on the main plate. Four shifting pieces are arranged on the aluminum box body. A shifting fork is arranged at the lower end of each shifting piece. Two shifting rods are arranged on each shifting fork. The shifting pieces are connected with the pull rod joints through the pull rods. The shifting rods are connected with the control sound transmission pieces.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of musical instruments, and particularly relates to a hand organ variable pitch system assembly. BACKGROUND

[0002] The hand organ is a keyboard instrument capable of both solo and accompaniment, which can not only play beautiful melodies of single voice part, but also play music of multiple voice parts, and even play rich harmonies with both hands like a piano. With the development of history and the improvement of playing level, the hand organ has improved the transmission structure, expanded the pitch range, increased the resonance, and changed the tone, and its structure is increasingly perfect; the function of the right-hand keyboard part is equivalent to that of a piano, and the left-hand bass part can play fixed chords of different properties and melodies, and the combination of the left and right hands can play various forms of music. The setting of the sound row enriches the sound level of the hand organ. The hand organ can simulate the tone of multiple musical instruments through the combination of different sound rows, and the arrangement and combination of sound are completed by a variable pitch system. The existing hand organ variable pitch control system has a complex structure and a bulky size, and cannot meet the requirements of players for the hand organ to be more portable and light.

[0003] In order to solve the above problems in the prior art, the present application provides a hand organ variable pitch system assembly. SUMMARY

[0004] The present application aims to provide a hand organ variable pitch system assembly with a compact transmission system structure, light weight, and good variable pitch transmission effect.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a hand organ variable pitch system assembly comprises an audio control board, a variable pitch device and a transmission aluminum box; the audio control board comprises a main plate, a cover plate arranged at the bottom of the main plate, and control audio transmission pieces arranged between the main plate and the cover plate; the bottom of the main plate is provided with eight sliding grooves, and one control audio transmission piece is arranged in each sliding groove; the cover plate is flatly assembled at the bottom of the main plate, and the control audio transmission pieces are clamped between the cover plate and the main plate; a plurality of square sound holes are arranged along each sliding groove on the main plate, and square sound holes with the same size are arranged at the corresponding positions of the cover plate and the control audio transmission pieces; the variable pitch device comprises a bottom support, four layers of variable pitch transmission pieces and a plurality of keys arranged on the bottom support, the relative positions of the four layers of variable pitch transmission pieces can be changed by pressing different keys, and a pull rod joint is arranged on the variable pitch transmission pieces; the transmission aluminum box comprises an aluminum box body, the aluminum box body is mounted on the main plate, four stirrers are arranged on the aluminum box body, a fork is arranged at the lower end of each stirrer, two stirrers are arranged on each fork, the stirrers are connected with the pull rod joints through the pull rods, and the stirrers are connected with the control audio transmission pieces.

[0006] Preferably, the sound changer further comprises a key shaft and a plurality of three-point dials; the bottom support is provided with a plurality of vertical mounting plates at equal intervals, and the upper end of each mounting plate is provided with a key shaft mounting hole; a pair of arc-shaped holes are oppositely arranged between the mounting plates, and a shaft hole is arranged between the arc-shaped holes, and a strip-shaped hole is arranged on one side of the shaft hole; the middle part of the sound transmission plate is provided with a plurality of rectangular transmission holes, one side of the sound transmission plate is provided with a plurality of strip-shaped control holes with different lengths, and the other side edge of the sound transmission plate is provided with a plurality of protruding limiting plates; the three-point dial comprises two oppositely arranged bending parts and a straight part, and the center of the three-point dial is provided with a rotating shaft; the sound transmission plate is fixedly installed on the bottom support in four layers, the mounting plate passes through the transmission hole, the key shaft is arranged in the key shaft mounting hole of the mounting plate, the plurality of keys are arranged on the key shaft, and the keys are respectively located between two adjacent mounting plates; the bottom of the key is provided with a key leg, and the key leg passes into the strip-shaped hole downward; the rotating shaft of the three-point dial is arranged in the shaft hole of the support plate, the two bending parts of the three-point dial pass through the pair of arc-shaped holes respectively, the outer ends of the two bending parts are respectively connected with the control hole and the limiting plate, and the straight part is located below the strip-shaped hole.

[0007] Preferably, the transmission hole positions of the four groups of sound transmission plates are the same, and the number and position arrangement of the control holes and the limiting plates of the four groups of sound transmission plates are different.

[0008] Preferably, the pull rod joint is located on one side of the sound transmission plate close to the control hole.

[0009] Preferably, the positions of the pull rod joints on the four groups of sound transmission plates are different.

[0010] Preferably, a plurality of separation strips are arranged between the four groups of sound transmission plates to maintain the spacing between the four layers of sound transmission plates.

[0011] Preferably, four shaft sleeves are arranged in parallel through the top of the aluminum box body, a vertical shaft is arranged in each shaft sleeve, the dial plate is arranged at the upper end of the vertical shaft, and a fork is arranged at the lower end of the vertical shaft; the outer end of the dial plate is provided with an upper connecting rivet, and the upper connecting rivet is connected with the pull rod; the fork comprises a fork body, and the dial rod is symmetrically arranged on the opposite sides of the fork body; the outer end of the dial rod is provided with a lower connecting rivet, and the lower connecting rivet is connected with the sound transmission plate.

[0012] Preferably, the dial rod is bent downward relative to the fork body, so that the fork has an overall arc-shaped structure.

[0013] Preferably, a fixed connection hole is arranged at the top of the aluminum box body.

[0014] Preferably, the aluminum box body has an oval structure.

[0015] Compared with the prior art, the application has the advantages that: (1) the sound changer structure is ingeniously designed, through the ingenious cooperation between the three-point lever, the key leg and the sound changing transmission sheet (specifically, the key drives the key leg to move, the key leg drives the flat part of the three-point lever to move, the flat part drives the two bent parts to move, and the two bent parts are limited by the control hole of the sound changing transmission sheet and the limiting sheet), the four layers of sound changing transmission sheets can form various arrangement combinations with different relative position relationships, and the pull rod technology is used to further control the sound control board to open and close the sound holes according to the syllable arrangement requirements; (2) the sound control board main body structure is light and thin, which is composed of a main plate, a cover plate and eight transmission sheets, the eight transmission sheets can slide freely, meanwhile, the components are assembled tightly and the gap is small, so that the air consumption during performance is minimized; (3) the transmission aluminum box is small in size and compact in structure, the structure and arrangement of the four groups of levers are reasonable, the levers will not collide with each other during transmission, the transmission aluminum box occupies less space than the traditional transmission connecting piece, and the whole sound changing system structure of the accordion is more compact; (4) the transmission of the transmission aluminum box is more effective, one lever can drive two levers to rotate, thereby driving two groups of sound control transmission sheets to move, and opening the corresponding sound holes on the sound control board, so that the sound is transmitted through the sound holes of the sound control board; meanwhile, different levers are driven to rotate, thereby driving different transmission sheets to move and opening different sound holes on the sound control board, so that various arrangement combinations can be formed, and the sound control transmission sheets can open and close the sound holes according to the syllable arrangement requirements, so that different timbres required by the performer can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an assembly structure diagram of the sound control board and the transmission aluminum box in the application.

[0017] Figure 2 It is a structure diagram of the sound changer in the application.

[0018] Figure 3 It is a bottom structure diagram of the sound control board in the application.

[0019] Figure 4 It is a side view of the main plate of the sound control board in the application.

[0020] Figure 5 It is a structure diagram of the bottom support of the sound changer in the application.

[0021] Figure 6 It is a structure diagram of the sound changing transmission sheet in the application.

[0022] Figure 7 It is a structure diagram of the bottom support of the sound changer installing the three-point lever in the application.

[0023] Figure 8 It is a bottom structure diagram of the bottom support of the sound changer installing the three-point lever in the application.

[0024] Figure 9 Figure 1 is a schematic diagram of the structure of the transmission aluminum box in the present application;

[0025] Figure 10 Figure 2 is a schematic diagram of the bottom structure of the transmission aluminum box in the present application;

[0026] Figure 11 Figure 3 is a schematic diagram of the structure of the fork in the transmission aluminum box in the present application;

[0027] In the figure: 1, sound control board; 11, main board; 111, sliding groove; 12, cover plate; 13, sound control transmission piece; 14, sound hole; 2, sound changing device; 21, bottom support; 211, vertical mounting piece; 212, key shaft mounting hole; 213, arc-shaped hole; 214, shaft hole; 215, strip-shaped hole; 22, sound changing transmission piece; 221, transmission hole; 222, control hole; 223, limiting piece; 224, pull rod joint; 225, separation strip; 23, key shaft; 24, key; 25, three-point poking stick; 251, bent part; 252, straight part; 253, rotating shaft; 3, transmission aluminum box; 31, aluminum box body; 32, shaft sleeve; 33, poking piece; 34, upper connecting rivet; 35, fixed connecting hole; 36, lower connecting rivet; 37, vertical shaft; 38, fork; 381, fork body; 382, poking stick. DETAILED DESCRIPTION

[0028] One preferred embodiment of the present application will be described below in conjunction with the accompanying drawings, which clearly and completely describe the technical solutions in the preferred embodiment of the present application.

[0029] Please refer to Figure 1 and Figure 2 , the present application comprises a sound control board 1, a sound changing device 2 and a transmission aluminum box 3, the sound control board 1 and the sound changing device 2 are connected through the transmission aluminum box 3, the transmission of the sound changing device 2 accurately opens different sound holes of the sound control board 1, so that the sound is transmitted through the sound holes of the sound control board 1, and the three together constitute the sound changing system of the accordion.

[0030] Please refer to Figure 3 and Figure 4 , the sound control board 1 comprises a main board 11, a cover plate 12 arranged at the bottom of the main board 11, and a sound control transmission piece 13 arranged between the main board 11 and the cover plate 12.

[0031] The main plate 11 is rectangular in structure and made of aluminum alloy. Eight grooves 111 are formed on the bottom of the main plate 11, and one sound control transmission piece 13 is arranged in each groove 111. The cover plate 12 is arranged on the bottom of the main plate 11 to sandwich the sound control transmission pieces 13 therebetween, and the three parts are assembled together. The gap between the parts should be less than 7 mm to minimize the air consumption during performance. A plurality of square sound holes 14 are formed on the main plate 11 along each groove 111. Square sound holes 14 of the same size are formed on the cover plate 12 and the sound control transmission pieces 13. The sound holes 5 of the three parts are of the same size and position. In this embodiment, 148 square sound holes 14 are formed on the main plate 1, and each group has four holes. There are 37 groups in total, which are arranged in two rows. The number and position of the sound holes on the sound control plate are different according to different models of the accordion.

[0032] Please refer to Figure 2 The sound changer 2 includes a bottom support 21, four layers of sound transmission pieces 22 and a plurality of keys 24 arranged on the bottom support 21. Different keys 24 are pressed to change the relative positions of the four layers of sound transmission pieces 22. The different arrangement combinations of the relative positions of the four layers of sound transmission pieces 22 are the key to changing the sound color of the accordion. A pull rod joint 224 is arranged on the sound transmission piece 22. The pull rod joint 224 controls the opening and closing of different sound holes on the sound control plate 1 by driving the pull rod. The sound changer 2 further includes a key shaft 23 and a plurality of three-point shift levers 25.

[0033] Please refer to Figure 5 The bottom support 21 is long and narrow. A plurality of vertical mounting pieces 211 are arranged on the bottom support 21 at equal intervals. A key shaft mounting hole 212 is formed on the upper end of the mounting piece 211 for mounting the key shaft 23. A pair of arc-shaped holes 213 are arranged opposite to each other between the mounting pieces 211. An axle hole 214 is formed between the arc-shaped holes 213. The axle hole 214 is used for mounting the three-point shift lever 25. A strip-shaped hole 215 is formed on one side of the axle hole 214.

[0034] Please refer to Figure 6 A plurality of rectangular transmission holes 221 are formed in the middle of the sound transmission piece 22. A plurality of strip-shaped control holes 222 of different lengths are formed on one side of the sound transmission piece 22. A plurality of protruding limiting pieces 223 are arranged on the other side edge of the sound transmission piece 22. Figure 6 As can be seen from the figure, the transmission holes 221 of the four groups of sound transmission pieces 22 are completely coincident in size and position. The number and position of the control holes 222 and the limiting pieces 223 of the four groups of sound transmission pieces 22 are different. The four layers of sound transmission pieces 22 can move relative to each other. Different overlapping relationships of the control holes 222 and the limiting pieces 223 produce a plurality of different arrangement combinations.

[0035] Please refer toFigure 7 and Figure 8 The three-point dialing stick 25 includes two oppositely arranged bending parts 251 and a straight part 252, and the center of the three-point dialing stick 25 is provided with a rotating shaft 253. The three-point dialing stick 25 is installed at the bottom of the bottom support 21. During the rotation of the rotating shaft 53, the two bending parts 251 can drive the control hole 222 and the limiting sheet 223 to move, respectively. Due to the combined limiting effect of the control hole 222 and the limiting sheet 223, different arrangement combinations of the relative position relationship between the four layers of sound changing transmission sheets 22 are formed.

[0036] The assembly and working principle of each part of the sound changer are as follows:

[0037] The sound changing transmission sheets 22 are fixedly installed in four layers on the bottom support 21. The installation sheet 211 passes through the transmission hole 221, so that there is enough relative movement space between the four layers of sound changing transmission sheets 22. The key shaft 23 is arranged in the key shaft installation hole 212 of the installation sheet 211. The plurality of keys 24 are installed on the key shaft 23. The keys 24 are respectively located between two adjacent installation sheets 211. The bottom of the key 24 is provided with a key leg 241, which passes into the strip-shaped hole 215 downward. The rotating shaft 253 of the three-point dialing stick 25 is arranged in the shaft hole 214 of the bottom support 21. The two bending parts 251 of the three-point dialing stick 25 pass through the pair of arc-shaped holes 213, respectively. The outer ends of the two bending parts 251 are respectively connected with the control hole 222 and the limiting sheet 223. The straight part 252 is located below the strip-shaped hole 215. When the key 24 is pressed, the key leg 241 slides in the strip-shaped hole 215, drives the straight part 252 to move, and then the straight part 252 drives the three-point dialing stick 25 to rotate. Then the two bending parts 251 drive the control hole 222 and the limiting sheet 223 on both sides to move, respectively. Due to the double limiting of the control hole 222 and the limiting sheet 223 on both sides, the four groups of sound changing transmission sheets 22 form a fixed relative position relationship. Different keys 24 are pressed, and the four groups of sound changing transmission sheets 22 form different relative position relationships.

[0038] In the embodiment, the transmission holes 221 of the four groups of sound changing transmission sheets 22 are arranged in the same position, and the number and position arrangement of the control holes 222 and the limiting sheets 223 of the four groups of sound changing transmission sheets 22 are different.

[0039] In the embodiment, the sound changer 2 is connected with the sound control board 1 through the transmission aluminum box 3. The change transmission of the sound changer transmission piece 22 accurately opens the different sound holes of the sound control board, so that the sound is transmitted through the sound hole of the sound control board, and the sound control board transmission piece opens and closes the sound hole according to the syllable arrangement requirement, so as to achieve the different timbres required by the performer. Therefore, the pull rod joint 24 is arranged on the side of the sound changer transmission piece 2 close to the control hole 22, the pull rod joint 24 is connected with the pull rod, the pull rod drives the opening and closing of the sound hole of the sound control board through the transmission aluminum box, so as to play different timbres.

[0040] In the embodiment, in order to make the pull rod joint 224 have sufficient moving space and not overlap and collide with each other, the positions of the pull rod joints 24 on the four groups of sound changer transmission pieces 22 are staggered and arranged, and the positions of the pull rod joints 224 on the four groups of sound changer transmission pieces 22 are different.

[0041] In the embodiment, a plurality of separation strips 225 are arranged between the four groups of sound changer transmission pieces 22, so that the four layers of sound changer transmission pieces 22 maintain a spacing.

[0042] Please refer to Figure 9 and Figure 10 , the transmission aluminum box 3 includes an aluminum box body 31, the aluminum box body 31 is installed on the main board 11, and four shift pieces 33 are arranged on the aluminum box body 31. The lower end of each shift piece 33 is provided with a shift fork 38, and two shift rods 382 are arranged on each shift fork 38. The shift piece 33 is connected with the corresponding pull rod joint 224 through the pull rod, and the shift rod 382 is connected with the corresponding sound control transmission piece 13.

[0043] Four shaft sleeves 32 are arranged in parallel through the top of the aluminum box body 31, and a vertical shaft 37 is installed in the shaft sleeve 32. The shift piece 33 is arranged at the upper end of the vertical shaft 37, and the shift fork 38 is arranged at the lower end of the vertical shaft 37. The outer end of the shift piece 33 is provided with an upper connecting rivet 34, and the upper connecting rivet 34 is connected with the pull rod. The shift fork 38 includes a shift fork body 381, and the shift rods 382 are symmetrically arranged on the opposite sides of the shift fork body 381. The outer end of the shift rod 382 is provided with a lower connecting rivet 36, and the lower connecting rivet 36 is connected with the sound control transmission piece 13.

[0044] In the embodiment, the shift rod 382 is bent downward relative to the shift fork body 381, so that the shift fork 38 has an overall arc structure. As shown in Figure 11 , four shift forks 38 are arranged at the bottom of the transmission aluminum box 3. Since the two shift rods 382 of one shift fork 38 are arranged on the opposite sides and the shift rod 382 is in a bent state, the four groups of shift forks 38 are staggered and arranged, but do not collide during rotation.

[0045] In the embodiment, the top of the aluminum box body 31 is provided with a fixed connection hole 35, and the transmission aluminum box is installed on the sound control board through the fixed connection hole 35.

[0046] In the embodiment, the aluminum box body 31 is an elliptical structure.

[0047] The working principle of the present application is as follows:

[0048] The sound changer 2 is composed of four layers of sound transmission pieces 22 with different structures (specifically, the number, structure and position of the control holes 222 and the limiting pieces 223 are different), and is installed on the sound changer frame. The keys 24 are assembled in fixed positions through the key shaft 23, and different keys 24 can make the four layers of sound transmission pieces 22 produce different position combinations. Then, the sound changer 2 transmits the changes to the sound control board 1 through the transmission aluminum box 3 by using the pull rod technology. According to different models of the accordion, the number of the sound changer keys 24 can be 3, 5, 7, 11, 13, etc.

[0049] Specifically, when the key 24 is pressed, the key leg 241 moves forward and backward in the strip-shaped hole 215 of the bottom support 21. Since the flat part 252 of the three-point shifting rod 25 is located at the bottom of the strip-shaped hole 215, the key leg 241 drives the flat part 252 to move, and the flat part 252 drives the three-point shifting rod 25 to rotate. Then, the two bending parts 251 drive the control holes 222 and the limiting pieces 223 on the two sides to move, respectively. Since the structures and positions of the control holes 222 and the limiting pieces 223 on the four layers of sound transmission pieces 22 are different, the two sides are jointly limited, so that the four layers of sound transmission pieces 22 form a group of fixed relative position relationships. When different keys 24 are pressed, the four layers of sound transmission pieces 22 form different relative position relationships, so that different keys 24 produce a variety of different position arrangements, thereby further controlling the sound control board 1 to open and close the sound holes according to the syllable arrangement requirements.

[0050] The sound changer 2 drives the shifting piece 33 to move through the pull rod. One shifting piece 33 can drive the two shifting rods 382 on the shifting fork 38 to rotate simultaneously, and the two shifting rods 382 drive the two groups of sound control transmission pieces 13 on the sound control board 1 to move in opposite directions, so as to open the corresponding sound holes 14 on the sound control board 1, so that the sound is transmitted out through the sound holes 14 on the sound control board 1. The sound changer drives different shifting pieces 33 to rotate, which drives different sound control transmission pieces 13 to move, so as to open different sound holes 14 on the sound control board 1, and a variety of arrangements can be formed, so that the sound control board 1 can open and close the sound holes 14 according to the syllable arrangement requirements, thereby achieving the different timbres required by the performer.

[0051] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. An accordion transposing system assembly, characterized by: It comprises a sound control board (1), a sound changer (2) and a transmission aluminum box (3). The sound control board (1) comprises a main board (11), a cover plate (12) arranged at the bottom of the main board (11), and sound control transmission sheets (13) arranged between the main board (11) and the cover plate (12); eight grooves (111) are formed at the bottom of the main board (11), and one sound control transmission sheet (13) is arranged in each groove (111); the cover plate (12) is flatly assembled at the bottom of the main board (11) to clamp the sound control transmission sheets (13) therebetween; a plurality of square sound holes (14) are formed in the main board (11) along each groove (111), and square sound holes (14) with the same size are formed at corresponding positions of the cover plate (12) and the sound control transmission sheets (13); The sound changer (2) comprises a bottom support (21), and the bottom support (21) is provided with four layers of sound changing transmission sheets (22) and a plurality of keys (24); the relative positions of the four layers of sound changing transmission sheets (22) can be changed by pressing different keys (24); a pull rod joint (224) is arranged on the sound changing transmission sheet (22); The sound changer (2) further comprises a key shaft (23) and a plurality of three-point shifting rods (25); A plurality of vertical mounting sheets (211) are arranged at equal intervals on the bottom support (21), and a key shaft mounting hole (212) is formed at the upper end of each mounting sheet (211); a pair of arc-shaped holes (213) are arranged opposite to each other between the mounting sheets (211), an axle hole (214) is formed between the arc-shaped holes (213), and a strip-shaped hole (215) is formed at one side of the axle hole (214); A plurality of rectangular transmission holes (221) are formed in the middle of the sound changing transmission sheet (22), a plurality of strip-shaped control holes (222) with different lengths are formed at one side of the sound changing transmission sheet (22), and a plurality of protruding limiting sheets (223) are arranged at the other side edge of the sound changing transmission sheet (22); The three-point shifting rod (25) comprises two opposite bending parts (251) and a straight part (252), and a rotating shaft (253) is arranged at the center of the three-point shifting rod (25); The sound changing transmission sheets (22) are fixedly installed in four layers on the bottom support (21), the mounting sheets (211) pass through the transmission holes (221), the key shaft (23) is arranged in the key shaft mounting hole (212) of the mounting sheet (211), the keys (24) are arranged on the key shaft (23), and the keys (24) are respectively arranged between adjacent mounting sheets (211); a key leg (241) is arranged at the bottom of the key (24), and the key leg (241) passes into the strip-shaped hole (215) downward; The rotating shaft (253) of the three-point shifting rod (25) is arranged in the axle hole (214) of the bottom support (21), the two bending parts (251) of the three-point shifting rod (25) pass through the pair of arc-shaped holes (213) respectively, the outer ends of the two bending parts (251) are respectively connected to the control hole (222) and the limiting sheet (223), and the straight part (252) is located below the strip-shaped hole (215). The transmission aluminum box (3) comprises an aluminum box body (31) mounted on the main plate (11), four dials (33) arranged on the aluminum box body (31), a fork (38) arranged at the lower end of the dial (33), and two dial rods (382) arranged on each fork (38); the dial (33) is connected to the corresponding pull rod joint (224) through a pull rod; the dial rod (382) is connected to the corresponding sound control transmission piece (13); Four shaft sleeves (32) are arranged in parallel on the top of the aluminum box body (31), a vertical shaft (37) is installed in the shaft sleeve (32), the dial (33) is arranged at the upper end of the vertical shaft (37), and the fork (38) is arranged at the lower end of the vertical shaft (37); the outer end of the dial (33) is provided with an upper connecting rivet (34) connected with the pull rod; the fork (38) comprises a fork body (381), the dial rods (382) are symmetrically arranged on the opposite sides of the fork body (381); the outer end of the dial rod (382) is provided with a lower connecting rivet (36) connected with the sound control transmission piece (13); the dial rod (382) is bent downward relative to the fork body (381), so that the fork (38) has an overall arc structure.

2. An accordion sound system assembly according to claim 1, wherein: The transmission holes (221) of the four groups of variable sound transmission pieces (22) are arranged at the same position, and the number and position arrangement of the control holes (222) and the limiting pieces (223) of the four groups of variable sound transmission pieces (22) are different.

3. An accordion sound system assembly according to claim 2, wherein: The pull rod joint (224) is located on one side of the variable sound transmission piece (22) close to the control hole (222).

4. An accordion sound system assembly according to claim 3, wherein: The positions of the pull rod joints (224) on the four groups of variable sound transmission pieces (22) are different.

5. An accordion sound system assembly according to claim 4, wherein: A plurality of separation strips (225) are arranged between the four groups of variable sound transmission pieces (22) to maintain the spacing between the four layers of variable sound transmission pieces (22).

6. An accordion sound system assembly according to claim 1, wherein: Fixed connection holes (35) are formed at the top of the aluminum box body (31).

7. An accordion sound system assembly according to claim 1, wherein: The aluminum box body (31) has an oval structure.

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