Grand piano iron plate positioning device

Abstract

The utility model provides a grand piano iron plate positioning device which comprises an iron plate high-pitch positioning device used for positioning a high-pitch area of a piano iron plate, and the iron plate high-pitch positioning device is positioned between the high-pitch area of the piano iron plate and a back frame cross beam of a piano back frame. The piano further comprises an iron plate bass positioning device used for positioning the bass area of the piano iron plate, and the iron plate bass positioning device is positioned between the bass area of the piano iron plate and the back frame cross beam of the piano back frame. The positioning device can be used for the butt-assembling positioning precision among the grand piano iron plate, the tuning peg plate and the back frame, the dependence of manual operation on butt-assembling experience is eliminated, the operation is more convenient, and the butt-assembling time is saved; and meanwhile, the iron plates can be repeatedly disassembled and assembled during batch production, and the iron plates of the same model can be rapidly replaced.

Description

Technical Field

[0001] The utility model relates to the field of piano parts, and specifically relates to a positioning device for a grand piano iron plate. Background Art

[0002] The piano iron plate can also be called the piano iron bracket or the piano iron row. It is a cast iron part used for hooking the strings secretly, that is, the iron plate of the resonance disc in the piano parts. It is one of the main components of the sound source system and is also one of the important components directly affecting the quality of the piano. The piano iron plate needs to bear a tensile force of at least more than 16 tons from the strings, and the total tensile force of the strings of a grand piano (the largest nine-foot piano) can reach more than 26 tons.

[0003] The piano string plate is an important part of the support structure, with a thickness between 35 mm and 45 mm. Its shape is similar to the shape of the string plate part of the iron plate. Because it is fixed on the back of the string plate of the iron plate to fix the string pins and bears all the tension from the strings. It makes the sound of the piano in a very stable state and ensures the basic performance of the accurate pitch of the piano.

[0004] The piano back frame can also be called the piano backrest. The back frame bears a large amount of load generated by the string tension, and the load is approximately between 170,000 N and 180,000 N. Before the iron plate was not used in the past, the back frame mainly supported the tensile force from the strings.

[0005] After the grand piano iron plate, string plate and back frame are processed, it is necessary for the operator to accurately assemble them with each other. However, whether the alignment is accurate depends on the experience of the operator and the accuracy of size measurement. Even for an experienced operator, it is still easy to have inaccurate alignment during the assembly process, resulting in a large amount of manpower and time consumption during the assembly. If the assembly is inaccurate, it will affect the assembly of the piano keyboard hammers system and directly affect the quality of the piano.

[0006] Currently, according to the operation requirements of the production process and combining with the previous production design experience, a positioning device for a grand piano iron plate is designed and manufactured. Content of the Utility Model

[0007] The purpose of the utility model is to overcome the above-mentioned disadvantages of the prior art and provide a positioning device for a grand piano iron plate. This positioning device can be used for the alignment and positioning accuracy among the grand piano iron plate, string plate and back frame, getting rid of the dependence on the assembly experience of manual operation, being more convenient to operate, and saving the assembly time. At the same time, when mass production is satisfied, the iron plate can be repeatedly disassembled and assembled, and the iron plates of the same model can be quickly replaced.

[0008] In order to achieve the above technical features, the object of the present utility model is achieved as follows: A grand piano iron plate positioning device includes an iron plate high - pitch positioning device for positioning the high - pitch area of the piano iron plate, and the iron plate high - pitch positioning device is positioned between the high - pitch area of the piano iron plate and the cross - beam of the piano back frame;

[0009] It further includes an iron plate low - pitch positioning device for positioning the low - pitch area of the piano iron plate, and the iron plate low - pitch positioning device is positioned between the low - pitch area of the piano iron plate and the cross - beam of the piano back frame.

[0010] The iron plate low - pitch positioning device includes a low - pitch positioning bottom plate. At one end of the top of the low - pitch positioning bottom plate, a low - pitch counterweight is vertically fixed through a first bolt. At the other end of the top of the low - pitch positioning bottom plate, a limiting column is vertically fixed through a second bolt. At the top of the limiting column, a low - pitch positioning plate is fixed through a third bolt, and a first positioning hole and a second positioning hole are machined on the low - pitch positioning plate.

[0011] The limiting column includes a column body in the middle, and both ends of the column body are flange - plate structures. The flange - plate structures are respectively fixedly connected to the low - pitch positioning bottom plate and the low - pitch positioning plate through corresponding second bolts and third bolts.

[0012] The first positioning hole and the second positioning hole are respectively in positioning cooperation with the first iron - plate string - tuning button hole and the second iron - plate string - tuning button hole in the low - pitch area of the piano iron plate.

[0013] The low - pitch positioning bottom plate is positioned through the cross - beam of the back frame and the inner low - pitch side surface of the piano back frame.

[0014] The iron plate high - pitch positioning device includes a high - pitch positioning bottom plate. At one end of the high - pitch positioning bottom plate, a high - pitch counterweight is fixedly installed through a fourth bolt. At the other end of the high - pitch positioning bottom plate, a high - pitch limiting plate is fixedly installed through a fifth bolt. At the top of the high - pitch limiting plate, a high - pitch positioning plate is fixedly installed through a sixth bolt, and a positioning tip is arranged at the center of the top of the high - pitch positioning plate.

[0015] The high - pitch positioning bottom plate is positioned through the cross - beam of the back frame and the inner high - pitch side surface of the piano back frame.

[0016] The positioning tip is in positioning cooperation with the center hole of the lower string rest rib in the high - pitch area of the piano iron plate.

[0017] The present utility model has the following beneficial effects:

[0018] 1. Through the above - mentioned positioning device, the positioning of the iron plate of the grand piano can be quickly completed, improving the positioning accuracy of the assembly, getting rid of the dependence on the assembly experience of manual operation, making the operation more convenient, and saving the assembly time. During mass production, it can meet the repeated disassembly and assembly of the iron plate, and the iron plates of the same model can be quickly replaced.

[0019] 2. The above iron plate bass positioning device can achieve rapid and reliable positioning of the bass area of the piano iron plate.

[0020] 3. The above limit post can be used to reliably connect and fix the bass positioning bottom plate and the bass positioning plate.

[0021] 4. The above iron plate treble positioning device can be used for rapid positioning of the treble area of the piano iron plate.

[0022] 5. The above positioning tip can be used to position the treble area of the piano iron plate. Description of the Drawings

[0023] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0025] Figure 2 For the present utility model Figure 1 It is a partially enlarged view of the part where the iron plate treble positioning device is located in the present utility model.

[0026] Figure 3 For the present utility model Figure 1 It is a partially enlarged view of the part where the iron plate bass positioning device is located in the present utility model.

[0027] Figure 4 It is the front view of the iron plate bass positioning device of the present utility model.

[0028] Figure 5 It is the top view of the iron plate bass positioning device of the present utility model.

[0029] Figure 6 It is the front view of the iron plate treble positioning device of the present utility model.

[0030] Figure 7 It is the side view of the iron plate treble positioning device of the present utility model.

[0031] In the figure: piano iron plate 1, piano back frame 2, back frame cross beam 3, iron plate bass positioning device 4, second iron plate tuning button hole 5, piano string axis plate 6, center hole of the lower string rest rib 7, iron plate treble positioning device 8, inner side of the back frame treble 9, inner side of the back frame bass 10, first iron plate tuning button hole 11;

[0032] Bass counterweight 401, first bolt 402, bass positioning bottom plate 403, second bolt 404, limit post 405, third bolt 406, bass positioning plate 407, second positioning hole 408, first positioning hole 409;

[0033] High - pitch positioning base plate 801, fourth bolt 802, high - pitch counterweight 803, fifth bolt 804, high - pitch limit plate 805, sixth bolt 806, high - pitch positioning plate 807, positioning tip 808. Detailed implementation mode

[0034] The following further explains the implementation mode of the present utility model in conjunction with the attached drawings.

[0035] Embodiment 1:

[0036] See Figures 1-7 , a grand piano iron plate positioning device, including an iron plate high - pitch positioning device 8 for positioning the high - pitch area of the piano iron plate 1, and the iron plate high - pitch positioning device 8 is positioned between the high - pitch area of the piano iron plate 1 and the cross - beam 3 of the back frame 2 of the piano; it also includes an iron plate low - pitch positioning device 4 for positioning the low - pitch area of the piano iron plate 1, and the iron plate low - pitch positioning device 4 is positioned between the low - pitch area of the piano iron plate 1 and the cross - beam 3 of the back frame 2 of the piano. Through the above - mentioned positioning device, the positioning of the iron plate of the grand piano can be quickly completed, improving the positioning accuracy of the assembly, getting rid of the dependence on the assembly experience of manual operation, making the operation more convenient, and saving the assembly time. During mass production, it can meet the repeated disassembly and assembly of the iron plate, and the iron plates of the same model can be quickly replaced.

[0037] Furthermore, the iron plate low - pitch positioning device 4 includes a low - pitch positioning base plate 403. One end of the top of the low - pitch positioning base plate 403 is vertically fixed with a low - pitch counterweight 401 through a first bolt 402, and the other end of the top of the low - pitch positioning base plate 403 is vertically fixed with a limit post 405 through a second bolt 404. The top of the limit post 405 is fixed with a low - pitch positioning plate 407 through a third bolt 406. A first positioning hole 409 and a second positioning hole 408 are machined on the low - pitch positioning plate 407. Through the above - mentioned iron plate low - pitch positioning device 4, the rapid and reliable positioning of the low - pitch area of the piano iron plate 1 can be realized. During the positioning process, by horizontally placing the low - pitch positioning base plate 403 on the working platform and quickly moving it to the empty position in the low - pitch area of the piano back frame 2, making the two positioning surfaces of the low - pitch positioning base plate 403 fit into the included angle formed by the cross - beam surface of the cross - beam 3 of the back frame 2 in the empty space of the piano back frame 2 and the inner side surface 10 of the low - pitch part of the back frame, quickly move the piano iron plate 1 for positioning according to the center positions of the first positioning hole 409 and the second positioning hole 408 of the iron plate low - pitch positioning device 4, and align the first iron - plate string - tuning button hole 11 and the second iron - plate string - tuning button hole 5 in the low - pitch area of the piano iron plate 1 with the centers of the first positioning hole 409 and the second positioning hole 408 on the low - pitch positioning plate 407 one by one.

[0038] Further, the limit post 405 includes a column body in the middle, and both ends of the column body are flange plate structures. The flange plate structures are respectively fixedly connected to the bass positioning bottom plate 403 and the bass positioning plate 407 through corresponding second bolts 404 and third bolts 406. The limit post 405 can be used to reliably connect and fix the bass positioning bottom plate 403 and the bass positioning plate 407.

[0039] Further, the first positioning hole 409 and the second positioning hole 408 are respectively in positioning cooperation with the first iron plate tuning peg hole 11 and the second iron plate tuning peg hole 5 in the bass area of the piano iron plate 1. The first positioning hole 409 and the second positioning hole 408 can be used to quickly position the bass area of the piano iron plate 1.

[0040] Further, the bass positioning bottom plate 403 is positioned through the back frame cross beam 3 and the inner bass side surface 10 of the piano back frame 2. Through the above positioning surface, reliable positioning of the iron plate bass positioning device 4 can be achieved.

[0041] Further, the iron plate treble positioning device 8 includes a treble positioning bottom plate 801. One end of the treble positioning bottom plate 801 is fixedly installed with a treble counterweight 803 through a fourth bolt 802, and the other end of the treble positioning bottom plate 801 is fixedly installed with a treble limit plate 805 through a fifth bolt 804. The top end of the treble limit plate 805 is fixedly installed with a treble positioning plate 807 through a sixth bolt 806. A positioning tip 808 is arranged at the center of the top end of the treble positioning plate 807. The iron plate treble positioning device 8 can be used to quickly position the treble area of the piano iron plate 1. During the specific positioning process, the treble positioning bottom plate 801 is horizontally placed on the working platform and quickly moved to the inner empty position of the treble area of the piano back frame 2, so that the two positioning surfaces of the treble positioning bottom plate 801 are fitted into the included angle formed by the cross beam surface of the back frame cross beam 3 and the inner bass side surface 10 of the inner empty part of the piano back frame 2. According to the position of the positioning tip 808 of the iron plate treble positioning device 8, quickly move the center hole 7 of the lower string rest rib in the treble area of the piano iron plate 1, so that the center position of the center hole 7 of the lower string rest rib in the treble area of the iron plate is at the position where the positioning tip 808 of the treble positioning plate 807 is located.

[0042] Further, the treble positioning bottom plate 801 is positioned through the back frame cross beam 3 and the inner treble side surface 9 of the piano back frame 2. Through the above positioning method, reliable positioning of the iron plate treble positioning device 8 can be achieved.

[0043] Further, the positioning tip 808 is in positioning cooperation with the center hole 7 of the lower string rest rib in the treble area of the piano iron plate 1. Through the positioning tip 808, the treble area of the piano iron plate 1 can be positioned.

[0044] Embodiment 2:

[0045] A method for positioning and assembling the iron plate of a grand piano, the assembling method is realized by using the positioning device for the iron plate of the grand piano, and includes the following steps:

[0046] Step 1, Material preparation:

[0047] Horizontally place the piano back frame 2 on the working platform, place the piano stringer board 6 and the piano iron plate 1 at the corresponding positions of the piano back frame 2, use quick clamps to clamp and assemble the piano stringer board 6 and the piano iron plate 1, and ensure that they are completely jointed with each other;

[0048] Step 2, Quick positioning of the treble area of the piano iron plate:

[0049] Horizontally place the treble positioning bottom plate 801 of the iron plate treble positioning device 8 on the working platform, quickly move it to the empty position in the treble area of the piano back frame 2, so that the two positioning surfaces of the treble positioning bottom plate 801 are fitted into the included angle formed by the crossbeam surface of the back frame crossbeam 3 and the inner side surface of the back frame bass 10 in the empty space of the piano back frame 2, and quickly move the center hole 7 of the lower string rest rib in the treble area of the piano iron plate 1 according to the position of the positioning tip 808 of the iron plate treble positioning device 8, so that the center position of the center hole 7 of the lower string rest rib in the treble area of the iron plate is at the position where the positioning tip 808 of the treble positioning plate 807 is located;

[0050] Step 3, Quick positioning of the bass area of the piano iron plate:

[0051] Horizontally place the bass positioning bottom plate 403 of the iron plate bass positioning device 4 on the working platform, quickly move it to the empty position in the bass area of the piano back frame 2, so that the two positioning surfaces of the bass positioning bottom plate 403 are fitted into the included angle formed by the crossbeam surface of the back frame crossbeam 3 and the inner side surface of the back frame bass 10 in the empty space of the piano back frame 2, and quickly move and position the piano iron plate 1 according to the center positions of the first positioning hole 409 and the second positioning hole 408 of the iron plate bass positioning device 4, and align the first iron plate string fixing button hole 11 and the second iron plate string fixing button hole 5 in the bass area of the piano iron plate 1 with the centers of the first positioning hole 409 and the second positioning hole 408 on the bass positioning plate 407 one by one;

[0052] Step 4, Assembly of the piano stringer board 6:

[0053] According to the positions determined by the iron plate treble positioning device 8 and the iron plate bass positioning device 4, assemble the piano stringer board 6 on the piano back frame 2 by using fastening screws and positioning wooden pins. After the assembly is completed, the accurate installation position of the piano iron plate 1 can be obtained. Thus, the iron plate of the grand piano can be repeatedly disassembled and assembled in the subsequent processing procedures, and even replacing the same piano iron plate 1 will not affect the accurate position of the piano iron plate 1 in the piano.

Claims

1. A grand piano iron plate positioning device, characterized in that, It includes an iron plate treble positioning device (8) for positioning the treble area of the piano iron plate (1), and the iron plate treble positioning device (8) is positioned between the treble area of the piano iron plate (1) and the cross beam (3) of the piano back frame (2). It also includes an iron plate bass positioning device (4) for positioning the bass area of the piano iron plate (1), and the iron plate bass positioning device (4) is positioned between the bass area of the piano iron plate (1) and the cross beam (3) of the piano back frame (2).

2. The positioning device for the iron plate of a grand piano according to claim 1, wherein: The iron plate bass positioning device (4) includes a bass positioning bottom plate (403). At one end of the top of the bass positioning bottom plate (403), a bass counterweight (401) is vertically fixed by a first bolt (402). At the other end of the top of the bass positioning bottom plate (403), a limit post (405) is vertically fixed by a second bolt (404). At the top of the limit post (405), a bass positioning plate (407) is fixed by a third bolt (406). A first positioning hole (409) and a second positioning hole (408) are machined on the bass positioning plate (407).

3. The positioning device for the iron plate of a grand piano according to claim 2, characterized in that: The limit post (405) includes a column body in the middle, and both ends of the column body are flange plate structures, and the flange plate structures are respectively fixedly connected to the bass positioning bottom plate (403) and the bass positioning plate (407) by corresponding second bolts (404) and third bolts (406).

4. The positioning device for the iron plate of a grand piano according to claim 2, wherein: The first positioning hole (409) and the second positioning hole (408) are respectively in positioning cooperation with the first iron plate tuning peg hole (11) and the second iron plate tuning peg hole (5) in the bass area of the piano iron plate (1).

5. The positioning device for the iron plate of a grand piano according to claim 2, characterized in that: The bass positioning bottom plate (403) is positioned by the cross beam (3) and the inner bass side surface (10) of the piano back frame (2).

6. The positioning device for the iron plate of a grand piano according to claim 1, characterized in that: The iron plate treble positioning device (8) includes a treble positioning bottom plate (801). At one end of the treble positioning bottom plate (801), a treble counterweight (803) is fixedly installed by a fourth bolt (802). At the other end of the treble positioning bottom plate (801), a treble limit plate (805) is fixedly installed by a fifth bolt (804). At the top of the treble limit plate (805), a treble positioning plate (807) is fixedly installed by a sixth bolt (806). A positioning tip (808) is arranged at the center of the top of the treble positioning plate (807).

7. The positioning device for the iron plate of a grand piano according to claim 6, characterized in that: The treble positioning bottom plate (801) is positioned by the cross beam (3) and the inner treble side surface (9) of the piano back frame (2).

8. The positioning device for the iron plate of a grand piano according to claim 6, wherein: The positioning tip (808) is in positioning cooperation with the center hole (7) of the lower string rest rib in the treble area of the piano iron plate (1).

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