CN104700818B

CN104700818B - Iron plate of upright piano

Info

Publication number: CN104700818B
Application number: CN201310639390.2A
Authority: CN
Inventors: 吴天延
Original assignee: Yichang Jinbao Music Instrument Manufacture Co ltd
Current assignee: Yichang Jinbao Music Instrument Manufacture Co ltd
Priority date: 2013-12-04
Filing date: 2013-12-04
Publication date: 2023-06-16
Anticipated expiration: 2033-12-04
Also published as: CN104700818A

Abstract

An iron plate of an upright piano is divided into a chord plate and a big rib main body part, a plurality of big ribs of the iron plate are also arranged on the iron plate, the back surface of the chord plate of the iron plate is parallel to the horizontal plane, and the back surface of the big rib main body of the iron plate is an arched cambered surface. The radian of the cambered surface is the same as that of the soundboard. The cross section of the iron plate big rib is in an inverted U shape. The longitudinal section of the iron plate large rib is also in an arched arc structure. According to the iron plate of the upright piano, the inverted U-shaped design is adopted in the large rib section of the iron plate, and the arch design is adopted in the whole bottom surface, so that even if the iron plate is deformed, the iron plate can only arch towards the front surface, the problem of a series of matching codes caused by the deformation of the common iron plate towards the back surface is avoided, the novel iron plate structurally solves the problem that the iron plate of most common iron plates arches towards the back surface due to the raw materials or casting skill level, the subsequent production can be smoothly carried out, the production efficiency is improved, and the cost is saved.

Description

Iron plate of upright piano

Technical Field

The invention relates to an auxiliary component of an upright piano, in particular to an iron plate of the upright piano.

Background

At present, the existing piano iron plates on the market all adopt traditional structures, basically have flat bottom surfaces without radian, namely the back surfaces of the iron plates are planes, and each big rib of each iron plate is of a solid common structure, see fig. 1, 3, 5, 7, 9 and 11, and the iron plates have the defects of heavy weight and easy deformation. When the iron plate is cast out, after many working procedures such as sand removal, polishing, transportation, stillness, drilling, painting and the like, the code distribution production line can be formally assembled, in the process, the iron plate can deform due to the internal stress of the iron plate, particularly the deformation degree of each big rib and the lower capo rib of the iron plate is the greatest, and the iron plate is mostly deformed and arched towards the back surface of the iron plate, namely the back surface, wherein the back surface refers to the surface where the lower parts of the figures 3, 5, 7, 9 and 11 are located, and the following production can cause considerable problems, such as: when the deformed iron plates and the back frame are matched, if the deformation is small, the possibility can be realized, if the deformation is large, the problem of the iron plate sound pressing plate can be caused, the iron plate sound pressing plate can not be used at all, but the deformation of the iron plates can be corrected before the code matching, the manpower and material resources can be increased, and if the iron plates are poor in material, the iron plates are easy to be corrected and broken, so that the iron plates are quite time-consuming and labor-consuming and have no economic benefit. According to the current researches, the deformation of the iron plate is mainly determined by the casting technology level and the structure of the iron plate, so that most companies solve the problem, namely, the casting technology level is improved, generally, the investment of high-quality hardware facilities and the training of reinforcing personnel are increased, great cost investment is required for the companies, the deformation of the iron plate is controlled to be minimum, or the distance between the iron plate and the soundboard is increased during design, the back surface of the common iron plate is flat, the radian of the soundboard is arched in the middle, if the minimum distance between the iron plate and the soundboard is increased, namely, the distance between the iron plate and the soundboard is increased, the distance between the periphery of the iron plate and the soundboard is increased, and the excessive distance affects the tone and tone quality of a piano, so that the design is defective, and most schemes cannot solve the technical problems that the iron plate is heavy and easy to deform at present.

Disclosure of Invention

The invention aims to solve the technical problem of providing an iron plate of an upright piano, which has the advantages of light weight, high strength and strong stability. Compared with the common iron plates with the same size, the material cost is reduced, the labor intensity of workers can be indirectly reduced, and the production efficiency is improved.

In order to solve the technical problems, the invention adopts the following technical scheme: an iron plate of an upright piano is divided into a chord plate and a big rib main body part, a plurality of big ribs of the iron plate are also arranged on the iron plate, the back surface of the chord plate of the iron plate is parallel to the horizontal plane, and the back surface of the big rib main body of the iron plate is an arched cambered surface.

The radian of the cambered surface is the same as that of the soundboard.

The cross section of the iron plate big rib is in an inverted U shape.

The longitudinal section of the iron plate large rib is also in an arched arc structure.

The iron plate is of an integrated structure formed by integral casting.

Compared with the prior art, the iron plate of the upright piano provided by the invention has the following advantages:

1. the invention designs the structure of each big iron rib of the iron plate into an inverted U-shaped shape, compared with the common structure, the same sectional area is resistant to deformation, mainly has larger bending deformation capability, but the common structure needs to obtain the deformation resistance of the same size, the sectional area of the iron plate needs to be widened or heightened, thus the consumption of raw materials of the iron plate is increased, the total weight of the iron plate is increased, the whole novel iron plate bottom surface also adopts an arch design, compared with the common iron plate flat bottom surface, the stability is also improved, when the periphery of the iron plate is fixed on a back frame by screws, the novel iron plate is stressed by a musical instrument steel wire, the middle of the iron plate can bear larger load, and the common iron plate can bear additional load only by the material strength of the iron plate, so the iron plate has the characteristics of light weight, high strength and strong stability compared with the common iron plate.

2. Because the large-rib section of the iron plate adopts an inverted U-shaped design, and the whole bottom surface also adopts an arch design, even if the iron plate is deformed, the iron plate can only arch towards the front surface, the problem of a series of code matching caused by the deformation of the common iron plate towards the back surface is avoided, the novel iron plate structurally solves the problem that most of common iron plates arch towards the back surface, namely bend deformation, caused by raw materials or casting skill level, so that the subsequent production can be smoothly carried out, the production efficiency is improved, and the cost is saved.

3. The radian of the whole bottom surface, namely the back surface, of the large rib main body of the novel iron plate is basically the same as that of the soundboard, namely the distance between the iron plate and the soundboard is basically the same when the novel iron plate is assembled, so that the distance between the iron plate and the soundboard can be directly considered from the aspects of tone and the like during design, and the problems that the distance between the iron plate and the soundboard is too small and the periphery is too large are avoided, and the design structure of the piano is more compact.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

fig. 1 is a schematic front view showing the overall structure of an iron plate according to the present invention.

Fig. 2 is a schematic view of section D-D of fig. 1.

Fig. 3 is a schematic view showing a D-D cross-sectional view of an iron plate according to the prior art.

FIG. 4 is a schematic cross-sectional view A-A of FIG. 1.

Fig. 5 is a schematic view showing a cross-section of an iron plate in the prior art in A-A direction.

FIG. 6 is a schematic cross-sectional view of B-B of FIG. 1.

Fig. 7 is a schematic view showing a cross section of a prior art iron plate in the B-B direction.

FIG. 8 is a schematic cross-sectional view of C-C of FIG. 1.

Fig. 9 is a schematic view showing a cross section of a prior art iron plate in the C-C direction.

FIG. 10 is a schematic cross-sectional view taken along the direction D-D of the assembled invention.

Fig. 11 is a schematic sectional view of a related art iron plate in the D-D direction.

In the figure: the iron plate comprises an iron plate body 1, iron plate big ribs 2, iron plate lower capo main ribs 3, a chord plate 4, a back frame 5, a soundboard 6 and big rib main bodies 7.

Detailed Description

As shown in fig. 1, 2, 4, 6, 8 and 10, the iron plate 1 of the upright piano is divided into a chord plate 4 and a big rib main body 7, a plurality of iron plate big ribs 2 are further arranged on the iron plate 1, the back surface of the chord plate 4 of the iron plate 1 is parallel to the horizontal plane, and the back surface of the big rib main body 7 of the iron plate 1 is an arched cambered surface.

Preferably, the arc of the arc surface is the same as the arc of the soundboard 6.

The cross section of the iron plate big rib 2 is in an inverted U shape.

The longitudinal section of the iron plate big rib 2 is also in an arched arc structure.

The iron plate 1 is of an integral structure formed by integral casting.

As shown in fig. 1, 2, 4, 6, 8 and 10, the iron plates are integrally cast and are composed of a chord plate 4, iron plate big ribs 2, iron plate lower capo main ribs 3 and the like. The back of the chord axis plate of the novel iron plate is a plane parallel to the horizontal plane by taking the horizontal plane as a reference, the back of the large rib main body of the novel iron plate is of an arch structure, wherein the cross section of the large iron plate rib 2 is of an inverted U-shaped structure, the longitudinal section of the large iron plate rib 2 is of an arch structure, and the iron plate is not easy to deform due to the structure.

As shown in fig. 1, 2, 4, 6, 8 and 10, the novel iron plate is arched, the common iron plate is a plane, the arched iron plate can bear larger load than the plane according to the mechanical structure principle, and the cross section, the longitudinal section and the lower capo main rib 3 of the iron plate large rib 2 are the same. Examples: in actual production, after the iron plate and the back frame are assembled, the periphery of the iron plate is fixed on the back frame, and after the iron plate is hung with a string, the string has a pulling force on the iron plate, the force can deform the iron plate, and in order to resist the force, the strength of the iron plate is required to be higher than that of the iron plate, while the strength of the novel iron plate meets the requirements, but the deformation of the novel iron plate is obviously smaller than that of the common iron plate.

The novel iron plate has the advantages that the novel iron plate is assembled, the back of the iron plate is provided with radian and basically consistent with the radian of the soundboard, the distance between the iron plate and the soundboard is equidistant, the back of the common iron plate is a plane, the assembled effect is that the distance between the middle of the iron plate and the soundboard is minimum, the distance between the two sides of the iron plate is maximum, the novel iron plate can optimize the whole design of a piano, such as the reduction of the distance caused by the deformation of the iron plate to the back is not considered, the size of a resonance disk is increased, the bridge code can be designed more reasonably, the distance can be designed directly from the consideration of the tone quality of the piano, the common iron plate is not needed, the deformation condition of the iron plate is considered, the change of the tone quality caused by the increase of the distance is considered, the bridge code design is recalculated, and the like, and the novel iron plate can enable the designed structure to be more compact and reasonable.

Claims

1. An upright piano iron plate, iron plate (1) divide into chord axis board (4) and big muscle main part (7) part, still is equipped with many iron plate big muscle (2), characterized by on iron plate (1): the back surface of the chord shaft plate (4) of the iron plate (1) is parallel to the horizontal plane, and the back surface of the big rib main body (7) of the iron plate (1) is an arched cambered surface;

the radian of the cambered surface is the same as that of the soundboard (6), and the distance between the iron plate and the soundboard is equal;

the cross section of the iron plate big rib (2) is in an inverted U shape;

the longitudinal section of the iron plate big rib (2) is also in an arched arc structure;

the iron plate (1) is of an integrated structure formed by integral casting.