CN118016030A - Vertical piano soundboard with four-tone zone structural design and manufacturing method thereof - Google Patents

Abstract

The utility model provides an upright piano soundboard of four sound district structural design, including the back frame, be fixed with string iron plate above the back frame, adopt iron plate post and supporting bolt to support between the back frame and the string iron plate, adopt no cladding screw and locking screw to fix, back frame front is installed tone plate subassembly and string axle board, back side is installed the backplate, the tone plate subassembly front is installed string sign indicating number, back side is installed the rib, install if freeboard pivot on the string iron plate, string one end is fixed on string axle pin, the centre is striden and is pressed on string sign indicating number, the string is fixed on string sign indicating number to the string iron plate to the other end, the string is passed string iron plate through the fastening screw and is fixed with string axle board to press the string; according to the novel four-tone-zone structural design, the problem that the quality of a piano is poor due to weak strength and poor product stability of the back frame and the string iron plates of the existing three-tone-zone resonance disk structure is solved, the strength of the resonance disk is improved, the stability of the resonance disk is ensured, and therefore the quality of the piano is improved.

Description

Vertical piano soundboard with four-tone zone structural design and manufacturing method thereof

Technical Field

The invention relates to the technical field of piano manufacture, in particular to an upright piano soundboard with a four-tone region structural design and a manufacturing method thereof.

Background

The common piano soundboard is designed into a three-tone area structure, the back frame is designed into an assembled structure, the iron plates are designed into an X-shaped structure, the strength of the back frame and the iron plates of the soundboard structure is weak, the stability of products is poor, the quality of the piano is affected, the three-tone area structure is designed into a three-support corresponding to a string striking machine support, the distance between the high-tone supports is up to 1 meter at most, and the stability of the string striking machine is also affected; because the three-tone area structure has poor integral strength, the iron plate big ribs need to be subjected to string code and string code grooving treatment, the integrity of the string code is destroyed, and the energy transmission of the string code is greatly lost, so that the tone color transition balance of the high-tone area is poor; the iron plate has displacement tendency under the tension of strings after string hanging of the resonance disc, and the iron plate and the back frame are assembled unstably; the string tension of the soundboard is different in different tone areas (the string tension of the bass area is about 4-5 tons, the string tension of the middle-high tone area is about 12-15 tons), and the strength of the back frame and the iron plate structure is also affected differently.

For example, CN107617723a discloses an upright suspended piano soundboard, which belongs to a piano mating component, and comprises a soundboard assembly body, wherein a plurality of ribs are fixed on the soundboard assembly body, soundboard assembly frames are also fixed on the periphery of the soundboard assembly body, the soundboard assembly frames are sectional type, and part of edges of the soundboard assembly body are not contacted with the soundboard assembly frames. The soundboard assembly frame is of a sectional structure, so that part of the edge of the soundboard assembly body is not contacted with the soundboard assembly frame, and further the edge which is not contacted with the soundboard assembly frame when the soundboard assembly body vibrates can carry out suspension vibration, the degree of freedom is high, the emitted sound is bright and pleasant, the tone of a piano can be effectively improved, and meanwhile, the soundboard structure of the vertical suspension piano provided by the utility model is simple, and the vertical suspension piano can be installed and used in pianos of various specifications, and has a wide application range; the utility model only improves and strengthens the soundboard assembly, the whole structure is the three-tone-area soundboard, the problems of poor strength and stability of the soundboard are not fundamentally solved,

Disclosure of Invention

The invention aims to solve the technical problems of weak strength, poor product stability and poor high-pitch tone color balance of a back frame and string iron plates of the existing three-tone-zone resonance disk structure, thereby influencing the quality of a piano.

In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides an upright piano soundboard of four sound district structural design, contains the back frame, be fixed with string iron plate above the back frame, adopt iron plate post and supporting bolt to support between the back frame and the string iron plate, adopt no cladding screw and locking screw to fix, back frame front-mounted tone plate subassembly and string axle board, back-mounted backplate, the tone plate subassembly front-mounted string sign indicating number, back-mounted rib, install if freeboard pivot on the string iron plate, string one end is fixed on the string axle pin, the centre is striden on the string sign indicating number, the string is fixed on string iron plate's string nail to the other end, install the code nail on the string sign indicating number and fix the string with string iron plate through the string iron plate that the fastening screw passes, press the string strip to fix the string with the string.

In the preferred scheme, the back frame contains a plurality of back post, and back post one end is fixed on the upper beam, and the other end is fixed on the underbeam, and the back post is unequally arranged between upper beam and underbeam, and the back of the back frame inlays and bonds there is the backplate.

In the preferred scheme, the back column is of a double tenon structure at two ends, tenons at two ends are respectively inserted into holes of the upper beam and the lower beam, and the back column, the upper beam and the lower beam are fixed firmly by adopting a wooden wedge after assembly.

In the preferred scheme, the back of the string iron plate is provided with a back rib, the back rib is clung to the string shaft plate, the peripheral edges are supported by wood posts and locked by screw without plating, and the middle is supported and locked by a supporting bolt, so that the string iron plate and the back frame are tightly assembled together.

In the preferred scheme, the string iron plate is designed into a four-tone area structure, and a support rib is added in a high-tone area.

In the preferred scheme, the string iron plate is designed into a polygonal frame structure, and is also provided with a plurality of reinforcing ribs and sound playing holes, and a group of auxiliary plates and a lower sound pillow are connected with each other to form a stable triangular structure.

In the preferred scheme, the string iron plate and the string shaft pin are directly assembled, and a liner-free structure is adopted.

In the preferred scheme, the string code is designed to be integral and has no slot, and the bottom of the string code in the midrange is designed to be a tunnel structure.

In the preferred scheme, the string pressing strip in the high-pitched area is provided with a supporting leg and an overtone structure, and string pressing ribs are arranged on the string pressing strip.

In the preferred scheme, the soundboard assembly comprises a soundboard and a soundboard frame, the soundboard frame is made of hard beech, and the soundboard is made of high-quality spruce materials.

The method for manufacturing the upright piano soundboard with the four-tone zone structural design comprises the following steps:

step1: the string shaft pin, string code, iron plate wood column, supporting bolt, string pressing strip, locking screw, screw without coating, soundboard component, back plate, string shaft plate, rib wood, string hanging nail, code nail and fastening screw are placed in the assembly area for standby after being made and accepted;

step2: firstly, manufacturing an integrated double mortise-tenon structure and unequally spaced back frames and installing related parts, opening double tenons and grooves at two ends of a back post, opening tenons and grooves on an upper beam and a lower beam according to different design space requirements, positioning and placing the back post, the upper beam and the lower beam, extruding the tenons from the periphery through special equipment, enabling tenons to enter the tenons and grooves, driving wood wedges into the tenons and grooves to ensure tight matching of the tenons of the back post and the tenons of the upper beam and the tenons, then, embedding and bonding back plates on the back grooves of the back post, the upper beam and the back grooves of the lower beam, integrally forming an integrated back frame, installing chord codes on the front side of the sound plate assembly, installing rib wood on the back frame, adhering sound plate assembly and a chord shaft plate on the front side, accurately machining grooves on the chord shaft plate for assembling and positioning of a chord train iron plate, uniformly installing an iron plate on the front side of the back frame, and waiting for next step after acceptance inspection;

step3: secondly, manufacturing a string iron plate with a four-tone area frame structure and installing related parts, designing the string iron plate into a four-tone area structure according to string tension of different tone areas of a piano, arranging back ribs, reinforcing ribs and auxiliary plates, forming a plurality of triangles through each reinforcing rib, finally forming a polygonal structure integrally, arranging sound holes on the auxiliary plates to enable vibration of a piano sound plate assembly to be conducted, designing the string iron plate with back ribs, precisely machining bosses on the back ribs for slotting and assembling and positioning with the string shaft plate, arranging screw holes around the front edge of the string iron plate and in a middle setting area for later assembly, uniformly designing a plurality of through holes at the upper part of the string iron plate setting tone area for string shaft pin installation, arranging a lower sound reproduction pillow at the lower part of the string iron plate setting tone area, and carrying out next step assembly after acceptance inspection;

step4: then, assembling a back frame and a string iron plate, assembling the string iron plate on the back frame according to design requirements, supporting the string iron plate by an iron plate wood column and a supporting bolt, assembling a string iron plate back rib and a string shaft plate by positioning and aligning a boss and a slot, locking and assembling the string iron plate and the back frame by using a non-plating screw and a supporting bolt to form a whole, and assembling the string iron plate and the back frame in the next step after the string iron plate is qualified for inspection;

step5: finally, manufacturing and assembling a resonance disk, checking the height dimension of an upper capo and a lower capo of a string iron plate by adopting a special numerical control machine, processing the height of the string code, drilling a plurality of holes on the string code by adopting the special numerical control machine, installing a code nail, matching a plurality of through holes uniformly designed on the upper part of a string iron plate setting tone area with pin holes on the string iron plate, installing a string shaft pin, fixing one end of a piano string on the string shaft pin, pressing the middle span on the string code, passing through a code nail fixing position, fixing the other end of the piano string on the string iron plate, checking the height dimension of a string pressing bar and a string pressing rib by adopting the special numerical control machine, precisely processing a support leg, and fixing the string pressing bar with the string shaft plate by passing through the string iron plate through a fastening screw so as to press and fix the string.

The vertical piano soundboard with the four-tone zone structural design and the manufacturing method thereof have the following beneficial effects:

1. According to the integrated unequally spaced back frame, all parts are tightly connected through the mortise and tenon structure, meanwhile, back posts are designed to be correspondingly unequally spaced according to the string tension strength of different sound areas, the back post spacing in the area with large tension strength is reduced, so that string tension is resisted, the back face is inlaid and bonded with a back plate, the strength of an upper beam and a lower beam is increased, the overall stability is ensured, and the overall appearance is ensured;

2. According to the polygonal frame type iron plate, the overall strength is improved through the reinforcing ribs, meanwhile, the auxiliary plate lifting strength is increased in a high-tone area with high string tension, a plurality of reinforcing ribs form a more stable triangle, the strength of the piano iron plate is ensured, and the stability of a product is improved;

3. Compared with the structure of the three-tone region, the structure of the four-tone region is added with the high-tone region supporting ribs, so that the strength of a product is improved, and meanwhile, the structure of the four-tone region has a higher and wider range of range, and can better show the playing style;

4. The back frame and the iron plate are supported by the wood columns, the wood columns are implanted into the back frame to form a whole, the connection is firmer, meanwhile, the wood columns are made of diametral-cut smooth hard maples, the material density is high, the diametral-cut smooth hard textures ensure that the height and the size are not easily affected by the environmental temperature and humidity, and the assembly is tight;

5. According to the invention, the back frame and the middle area of the iron plate are provided with the supporting bolts for supporting the iron plate, so that the iron plate is ensured not to deform after being pulled by strings, and the stability is improved;

6. The iron plate in the high-pitched area adopts the overtone structure lower nut and the string pressing strip to generate rich harmonic waves and resonance effects, so that the piano has richer music and rhythm sense;

7. The string pressing strip is provided with the support legs, the string pressing strip has the effect of pressing strings in a string pillow area, the string pressing angle is too large or too small and can influence the product sound, the string pressing strip is provided with the support legs, the height dimension of the support legs is accurately processed by taking the string pressing ribs as references, the accurate dimension is ensured, the accurate string pressing angle is ensured, the support legs are in contact with the iron plates during assembly and then are locked by the screws, the string pressing angle is required to be checked and confirmed repeatedly during the installation of the traditional leg-free string pressing strip, and the string pressing strip with the support legs is more scheme and more accurate in installation compared with the traditional leg-free string pressing strip;

8. According to the invention, the back rib is tightly assembled with the chord shaft plate, the back rib boss and the chord shaft plate groove are precisely processed in a numerical control manner, the positioning is precise, and meanwhile, the tension of the string to the iron plate is conducted to the chord shaft plate through the back rib until the back frame, so that the iron plate is positioned more stably, and the quasi-stability of the string sound is ensured;

9. The string code is of an integral structure, grooves are not needed, the integrity of the string code is guaranteed, the string code can transmit vibration energy of strings to the soundboard, and the tone color transition of the whole high-pitched area is balanced.

Drawings

The invention is further described below with reference to the accompanying drawings and examples of implementation:

FIG. 1 is a front view of the overall structure of the present invention;

FIG. 2 is a left side view of the overall structure of the present invention;

FIG. 3 is a schematic view of the structure of the back frame of the present invention;

Fig. 4 is a front view of the string iron plate of the present invention;

FIG. 5 is a partial schematic view of the assembly of the peg of the present invention;

FIG. 6 is a schematic view of a partial structure of a chordal code assembly of the present invention;

FIG. 7 is a front view of a chordal code of the invention;

FIG. 8 is a top view of a chordal code of the present invention;

FIG. 9 is a schematic view of the assembly of the support bolt of the present invention;

FIG. 10 is a schematic view of the structure of the string-pressing bar according to the present invention;

FIG. 11 is a partial schematic view of a back post assembly of the present invention;

FIG. 12 is a partial elevation view of the mortise and tenon mechanism of the back post of the present invention;

FIG. 13 is a partial left side view of the mortise and tenon joint structure of the back post of the present invention;

FIG. 14 is a schematic diagram of a dual overtone configuration of the present invention;

FIG. 15 is a partial schematic view of an integrated back frame and iron plate assembly of the present invention;

FIG. 16 is a schematic view of the assembly of the back frame and the iron plate edge post support of the present invention;

In the figure: back frame 1, string iron plate 2, string shaft pin 3, string code 4, iron plate wood column 5, supporting bolt 6, string pressing bar 7, locking screw 8, no-plating screw 9, soundboard assembly 10, back plate 11, string shaft plate 12, rib 13, string 14, string hanging nail 15, code nail 16, fastening screw 17, back column 101, upper beam 102, lower beam 103, wood wedge 104, back rib 201, reinforcing rib 202, sound playing hole 203, auxiliary plate 204 and lower sound reproduction pillow 205.

Detailed Description

As shown in fig. 1 to 16, the upright piano soundboard with the four-tone zone structural design comprises a back frame 1, wherein a string iron plate 2 is fixed above the back frame 1, after being supported by an iron plate wood post 5 and a supporting bolt 6, the back frame 1 and the string iron plate 2 are fixed by adopting a non-plating screw 9 and a locking screw 8, a soundboard assembly 10 and a string shaft plate 12 are installed on the front surface of the back frame 1, a back plate 11 is installed on the back surface of the soundboard assembly 10, a string bar 4 is installed on the front surface of the soundboard assembly 10, a rib 13 is installed on the back surface, a string iron plate 2 is provided with a string pin freeboard, one end of a string 14 is fixed on the string pin 3, the middle of the string iron plate 4 is pressed, the other end of the string iron plate 2 is fixed on a string pin 15, a string 16 is installed on the string code 4 to fix the string 14, and a string pressing bar 7 is fixed with the string shaft plate 12 through the string iron plate 2 by fastening screws 17.

In this embodiment, the back frame 1 includes a plurality of back posts 101, one end of each back post 101 is fixed on the upper beam 102, the other end is fixed on the lower beam 103, the back posts 101 are not equidistantly arranged between the upper beam 102 and the lower beam 103, and the back of the back frame 1 is inlaid and bonded with a back plate 11;

The back column 101 is of a double tenon structure at two ends, tenons at two ends are respectively inserted into holes of the upper beam 102 and the lower beam 103, and after the back column is assembled, the two tenons are fixed firmly by adopting the wooden wedge 104;

The back of the string iron plate 2 is provided with a back rib 201, the back rib 201 is tightly attached to the string shaft plate 12, the peripheral edges of the back rib are supported by wood posts 5 and locked by non-plating screws 9, and the middle of the back rib is supported and locked by support bolts 6, so that the string iron plate 2 and the back frame 1 are tightly assembled together;

The string iron plate 2 is designed into a four-tone area structure, and a support rib is added in a high-tone area;

The string iron plate 2 is designed into a polygonal frame structure, and is also provided with a plurality of reinforcing ribs 202 and sound playing holes 203, a group of auxiliary plates 204 and a lower sound pillow 205, and the reinforcing ribs 202 are mutually connected to form a stable triangular structure;

the string iron plate 2 and the string shaft pin 3 are directly assembled, and a liner-free structure is adopted;

the string code 4 is designed to be integral and has no slot, and the bottom of the string code 4 in the midrange is designed to be a tunnel structure;

The string pressing strip 7 in the high-pitched region is provided with a supporting leg and overtone structure and string pressing ribs;

The soundboard assembly 10 comprises soundboards and soundboard frames, the soundboard frames are made of hard beech, and the soundboards are made of high-quality spruce materials.

A manufacturing method of an upright piano soundboard with a four-tone zone structural design specifically comprises the following steps:

step1: the string shaft pin 3, the string code 4, the iron plate wood column 5, the supporting bolt 6, the string pressing strip 7, the locking screw 8, the non-plating screw 9, the soundboard assembly 10, the back plate 11, the string shaft plate 12, the rib 13, the string 14, the string hanging nail 15, the code nail 16 and the fastening screw 17 are placed in an assembly area for standby after being manufactured and accepted;

step2: firstly, manufacturing an integrated double mortise structure and unequally spaced back frames 1 and installing related parts, opening double tenons and grooves at two ends of a back post 101 according to a design scheme, opening mortise holes in a matched mode according to different design interval requirements for an upper beam 102 and a lower beam 103, positioning and placing the back post 101 and the upper beam 102 and the lower beam 103, extruding the tenons from the periphery through special equipment, enabling tenons to enter the mortise holes, driving wood wedges 104 into the tenon grooves, ensuring tight matching of the tenons of the back post 101 and the tenons of the upper beam 102 and the lower beam 103, then, embedding and bonding back plates 11 on back grooves of the back post 101, the upper beam 102 and the lower beam 103, integrally forming the integrated back frame 1, installing chords 4 on the front of a sound board assembly 10, installing ribs 13 on the back of the back frame 1, bonding the sound board assembly 10 and a chord shaft board 12, accurately machining the grooves for assembling and positioning of a string iron board 2, uniformly installing iron board columns 5 on the front of the back frame 1, and after acceptance inspection, and waiting for next step of assembly;

step3: secondly, manufacturing a string iron plate 2 with a four-tone area frame structure and installing relevant parts, designing the string iron plate 2 into a four-tone area structure according to string tension of different tone areas of a piano, arranging back ribs 201, reinforcing ribs 202 and auxiliary plates 204, forming a plurality of triangles through the reinforcing ribs 202, finally forming a polygonal structure integrally, arranging sound holes 203 on the auxiliary plates 204, conducting vibration of a piano soundboard assembly 10, designing the string iron plate 2 with the back ribs 201, accurately machining bosses on the back ribs 201 for grooving and assembling and positioning with the chord shaft plate 12, arranging screw holes at the periphery of the front edge and the middle set area of the string iron plate 2 for later assembly, uniformly designing a plurality of through holes at the upper part of the set tone area of the string iron plate 2 for installation of a string shaft pin 3, arranging a lower sound pillow 205 at the lower part of the set tone area of the string iron plate 2, and waiting for next assembly after acceptance inspection;

step4: then, assembling the back frame 1 and the string iron plate 2, assembling the string iron plate 2 on the back frame 1 according to design requirements, supporting the string iron plate 2 through iron plate wood posts 5 and supporting bolts 6, positioning and aligning and assembling back ribs 201 of the string iron plate 2 and the string shaft plate 12 through bosses and grooves, locking and assembling the string iron plate 2 and the back frame 1 by using non-plating screws 9 and supporting bolts 6 to form a whole, and waiting for next assembly after acceptance inspection;

step5: finally, manufacturing and assembling a resonance disk, checking the height of an upper nut and a lower nut of a string iron plate 2 by adopting a special numerical control machine, processing the height of a string code 4, drilling a plurality of holes on the string code 4 by adopting the special numerical control machine, installing a code nail 16, matching a plurality of through holes uniformly designed on the upper part of a sound zone according to the string iron plate 2, installing a string shaft pin 3, fixing one end of a string 14 of a piano on the string shaft pin 3, pressing the middle part of the string on the string code 4, fixing the position through the code nail 16, fixing the other end of the string 14 with a string nail 15 of the string iron plate 2, checking the height of a string pressing bar 7 by adopting the special numerical control machine, precisely processing the support leg, and fixing the string pressing bar 7 with the string shaft plate 12 by penetrating the string iron plate 2 through a fastening screw 17 to press and fix the string 14.

In a preferred solution, the back frame 1 includes a plurality of back posts 101, one end of each back post 101 is fixed on the upper beam 102, the other end is fixed on the lower beam 103, the back posts 101 are arranged at unequal intervals between the upper beam 102 and the lower beam 103, and the back of the back frame 1 is inlaid and adhered with a back plate 11; the arrangement ensures that the interval distribution of the back posts 101 in the region with large resonance disc stress is smaller, the strong tension of strings can be resisted, and the product quality is more stable.

In the preferred scheme, the back post 101 has a double tenon structure at two ends, tenons at two ends are respectively inserted into holes of the upper beam 102 and the lower beam 103, and the three are fixed firmly by adopting the wooden wedge 104 after the assembly is completed; above setting ensures that the back post 101 combines inseparabler, difficult pine with upper beam 102, underbeam 103, and mortise cooperation structure ensures that back post 101 location is accurate simultaneously, and the assembly is convenient.

In the preferred scheme, a back rib 201 is arranged on the back surface of the string iron plate 2, the back rib 201 is tightly attached to the string shaft plate 12, the peripheral edges are supported by adopting wood posts 5 and locked by adopting electroless screws 9, the middle part is supported by adopting supporting bolts 6 and locked, and the string iron plate 2 and the back frame 1 are tightly assembled together; the arrangement ensures that the string iron plate 2 is tightly contacted with the back frame 1, and the tension of strings 14 borne by the string iron plate 2 can be uniformly conducted to the whole structure of the back frame 1, so that the overall stability is improved; the wood posts 5 are arranged at the peripheral edges, the support bolts 6 are arranged in the middle area to support the string iron plates 2, so that the string iron plates 2 are prevented from deforming after being stressed, and the stability and quality of products are further improved.

In the preferred scheme, the string iron plate 2 is designed into a four-tone area structure, and a high-tone area is added with supporting ribs; the four-tone region structure is arranged, the supporting ribs are additionally arranged in the high-tone region, the product strength is improved, and meanwhile, the four-tone region structure has a higher and wider range of range and can better show the playing style.

In the preferred scheme, the string iron plate 2 is designed into a polygonal frame structure, and is also provided with a plurality of reinforcing ribs 202 and sound playing holes 203, a group of auxiliary plates 204 and a lower sound pillow 205, and the reinforcing ribs 202 are mutually connected to form a stable triangular structure; above setting, constitute stable triangle-shaped through a plurality of strengthening ribs 202 each other, ensure that the steel string is listed as iron plate 2 intensity, when promoting product stability, through the lower doubly sound pillow 205 of setting for the string 14 produces abundant harmonic and resonance effect when playing for the music of piano is richer, has prosodic sense more.

In the preferred scheme, the string iron plate 2 and the string shaft pin 3 are directly assembled, and a liner-free structure is adopted; the pin 3 bushing is made of wood, and the pin 3 bushing is omitted, so that the pin 3 bushing is prevented from being contracted and expanded by the environment, stability of the pin 3 is affected, assembly procedures are reduced, and meanwhile quality and stability of the piano are further improved.

In the preferred scheme, the string code 4 is designed to be integral and has no slot, and the bottom of the string code 4 in the midrange is designed to be a tunnel structure; the design of the fluting-free integral string code 4 ensures the integral integrity of the high-pitched region of the string code 4, and can better conduct the vibration of the piano, 14 to the soundboard of the soundboard assembly 10, so that the tone transition of the whole high-pitched region is balanced, the bottom of the middle-pitched region string code 5 is designed into a tunnel structure, the vibration effect of the soundboard is improved, the influence of small vibration difference of the middle-pitched region is avoided, and the integral quality and the playing effect of a piano are further improved.

In the preferred scheme, the string pressing strip 7 in the high-pitched zone is provided with a supporting leg and overtone structure and string pressing ribs; the overtone structure arranged on the string pressing strip 7 and the overtone structure of the lower capotasto of the string iron plate 2 form special overtones in a high-pitched region together, so that the music of the piano is richer; the string pressing strip is provided with the supporting feet, the height dimension of the supporting feet is accurately machined by taking the string pressing ribs as the standard, the dimension is accurate, the string pressing angle is accurate, the supporting feet are in contact with the string iron plate 2 and locked by screws during assembly, the string pressing angle is required to be checked and confirmed repeatedly during installation of the traditional leg-free string pressing strip 7, and the installation height of the string pressing strip 7 is ensured.

In a preferred embodiment, the soundboard assembly 10 includes a soundboard and a soundboard frame, the soundboard frame is made of beech, and the soundboard is made of high-quality spruce material; above setting, the selection and the preparation of the different materials of soundboard and soundboard frame of being convenient for ensure that the soundboard better plays its function, and sound is graceful more, has further promoted the quality and the audio of piano.

According to the vertical piano soundboard with the four-tone area structural design and the manufacturing method thereof, the problems of poor quality of a piano caused by weak strength, poor product stability and poor high-tone color balance of the existing three-tone area soundboard structural back frame 1 and string iron plates 2 are solved through the novel four-tone area structural design, the strength of the soundboard is improved, the stability of the soundboard is ensured, and therefore the integral quality of the piano is improved.

Claims (10)

1. An upright piano soundboard of four sound district structural design, its characterized in that: the string bridge comprises a back frame (1), wherein a string column iron plate (2) is fixed above the back frame (1), an iron plate wood column (5) and a supporting bolt (6) are adopted between the back frame (1) and the string column iron plate (2) for supporting, a non-plating screw (9) and a locking screw (8) are adopted for fixing, a sound board assembly (10) and a string shaft plate (12) are installed on the front surface of the back frame (1), a backboard (11) is installed on the back surface of the back frame, a string bridge (4) is installed on the front surface of the sound board assembly (10), a rib wood (13) is installed on the back surface of the back frame, if freeboard shaft pins (3) are installed on the string column iron plate (2), one end of a string (14) is fixed on the string shaft pins (3), the middle of the string bridge is pressed on the string bridge (4), a code nail (16) is installed on the string bridge (4), and a string pressing bar (7) is fixed with the string shaft plate (12) through the string column iron plate (2) by means of fastening screws (17).

2. The upright piano soundboard of four-tone zone structural design of claim 1, wherein: the back frame (1) comprises a plurality of back posts (101), one ends of the back posts (101) are fixed on the upper beam (102), the other ends of the back posts are fixed on the lower beam (103), the back posts (101) are arranged between the upper beam (102) and the lower beam (103) at unequal intervals, and a back plate (11) is inlaid and adhered to the back surface of the back frame (1).

3. The upright piano soundboard of four-tone zone structural design of claim 2, wherein: the back column (101) is of a double tenon structure at two ends, tenons at two ends are respectively inserted into holes of the upper beam (102) and the lower beam (103), and after the back column is assembled, the upper beam, the lower beam and the lower beam are fixed firmly by adopting the wooden wedges (104).

4. The upright piano soundboard of four-tone zone structural design of claim 2, wherein: the back of the string iron plate (2) is provided with a back rib (201), the back rib (201) is tightly attached to the string shaft plate (12), the peripheral edges of the string iron plate are supported by wood posts (5) and locked by non-plating screws (9), and the middle of the string iron plate is supported and locked by support bolts (6), so that the string iron plate (2) and the back frame (1) are tightly assembled together.

5. The upright piano soundboard of four-tone zone structural design of claim 1, wherein: the string iron plate (2) is designed into a four-tone area structure, and a support rib is added in a high-tone area.

6. The upright piano soundboard of four-tone zone structural design of claim 1, wherein: the string iron plate (2) is designed into a polygonal frame structure, a plurality of reinforcing ribs (202) and sound playing holes (203) are further arranged, a group of auxiliary plates (204) and a lower sound pillow (205) are connected with each other, and the reinforcing ribs (202) form a stable triangular structure.

7. The upright piano soundboard of four-tone zone structural design of claim 1, wherein: the string iron plate (2) and the string shaft pin (3) are directly assembled, and a lining-free structure is adopted.

8. The upright piano soundboard of four-tone zone structural design of claim 1, wherein: the string code (4) is designed to be integral and has no slot, and the bottom of the string code (4) in the midrange is designed to be a tunnel structure.

9. The upright piano soundboard of four-tone zone structural design of claim 1, wherein: the string pressing strip (7) in the high-pitched region is provided with a supporting leg and overtone structure and string pressing ribs.

10. A method for manufacturing a four-tone zone structural design vertical piano soundboard, which is characterized in that the method for manufacturing the four-tone zone structural design vertical piano soundboard is as claimed in claims 1-9, and comprises the following steps:

step1: the string shaft pin (3), the string code (4), the iron board wood column (5), the supporting bolt (6), the string pressing strip (7), the locking screw (8), the non-plating screw (9), the soundboard assembly (10), the back plate (11), the string shaft plate (12), the rib wood (13), the string (14), the string hanging nail (15), the code nail (16) and the fastening screw (17) are placed in an assembly area for standby after being manufactured and accepted;

step2: firstly, manufacturing an integrated double mortise structure, manufacturing non-equidistant back frames (1) and installing related parts, opening double tenons and grooves at two ends of each back post (101), arranging upper beams (102) and lower beams (103) according to different design space requirements, positioning and placing the back posts (101), the upper beams (102) and the lower beams (103), extruding tenons from the periphery through special equipment, driving wooden wedges (104) into the tenons and grooves, ensuring tight fit between tenons of the back posts (101) and the tenons of the upper beams (102) and the lower beams (103), then embedding and bonding back plates (11) on back grooves of the back posts (101), the upper beams (102) and the lower beams (103), integrally forming an integrated back frame (1), installing chord codes (4) on the front surfaces of sound plate assemblies (10), installing rib bars (13) on the back frames (1), bonding sound plate assemblies (10) and chord shaft plates (12), precisely machining grooves for assembling and positioning iron plates (2) on the back frames (1), and uniformly installing the back frames (5), and accepting qualified wood frames after the back frames (5) are uniformly assembled;

step3: secondly, manufacturing a string iron plate (2) with a four-tone area frame structure and installing relevant parts, designing the string iron plate (2) into a four-tone area structure according to string tension of different tone areas of a piano, arranging back ribs (201), reinforcing ribs (202) and auxiliary plates (204), forming a plurality of triangles through the reinforcing ribs (202), finally forming a polygonal structure integrally, arranging sound holes (203) on the auxiliary plates (204), conducting vibration of a piano soundboard assembly (10), designing the string iron plate (2) with the back ribs (201), precisely machining bosses on the back ribs (201) for being assembled and positioned with grooves on a string shaft plate (12), arranging screw holes around the front edge and in the middle of the string iron plate (2) for later assembly, uniformly designing a plurality of through holes on the upper part of the string iron plate (2) in the set tone area for mounting a string shaft pin (3), arranging a lower sound pillow (205) on the lower part of the string iron plate (2), and checking and fitting the string iron plate after the string iron plate is qualified;

step4: then, assembling the back frame (1) and the string iron plate (2), assembling the string iron plate (2) on the back frame (1) according to design requirements, supporting the string iron plate (2) through iron plate wood posts (5) and supporting bolts (6), positioning and aligning and assembling back ribs (201) of the string iron plate (2) and the string shaft plate (12) through bosses and grooves, locking and assembling the string iron plate (2) and the back frame (1) by using non-plating screws (9) and supporting bolts (6), forming a whole, and waiting for next assembly after acceptance inspection;

step5: finally, manufacturing and assembling a resonance disc, checking the height of an upper capo and a lower capo of a string iron plate (2) by adopting a special numerical control machine, processing the height of a string code (4), drilling a plurality of holes on the string code (4) by adopting the special numerical control machine, installing a code nail (16), matching a plurality of through holes uniformly designed on the upper part of a string iron plate (2) to form a pin hole on a string shaft plate (12), installing a string shaft pin (3), fixing one end of a piano string (14) on the string shaft pin (3), pressing the middle part on the string code (4), fixing the other end of the piano string on a string pin (15) of the string iron plate (2) through the fixing position of the code nail (16), checking the height of a string pressing bar (7) by adopting the special numerical control machine, accurately processing the support leg, and fixing the string pressing bar (7) with the string shaft plate (12) through a fastening screw (17) penetrating the string iron plate (2), so as to press and fix the string (14), thus, manufacturing the string (14) by the cross-tone area structure, and finishing the acceptance disc.