Grand piano iron plate positioning device and assembling method

Abstract

The invention provides a grand piano iron plate positioning device and an assembling method, the grand piano iron plate positioning device 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 invention relates to the field of piano parts, in particular to a grand piano iron plate positioning device and an assembly method. Background Art

[0002] Piano iron plate can also be called piano iron bracket or piano iron bar. It is a cast iron part used for hidden hook of piano strings, that is, the iron plate of the resonance plate in piano parts. It is one of the main components of the sound source system and one of the important components that directly affects the quality of the piano. The piano iron plate needs to withstand at least 16 tons of tension from the strings. The total tension of the strings of the grand piano (the largest nine-foot piano) can reach more than 26 tons.

[0003] The piano pinblock is an important part of the support structure, with a thickness of 35mm-45mm. Its shape is similar to that of the iron plate of the string pin, because it is fixed on the back of the iron plate to fix the string pin and bears all the tension from the strings. It keeps the sound of the piano in a very stable state and ensures the basic performance of the piano's stable pitch.

[0004] The piano back frame can also be called the piano back frame. The back frame bears a large amount of weight generated by the tension of the strings, which is approximately between 170,000 N and 180,000 N. Before the use of iron plates in the past, the back frame was mainly used to support the tension from the strings.

[0005] After the grand piano's iron plate, pegboard and back frame are processed, the operator is required to accurately align them with each other. However, the accuracy of the alignment depends on the operator's experience and the accuracy of the dimensional measurement. Even for experienced operators, inaccurate alignment is still prone to occur during the assembly process, resulting in a lot of manpower and time required for the assembly. Inaccurate alignment will affect the assembly of the piano's keyboard action system, and the diameter will affect the quality of the piano.

[0006] At present, according to the production process operation requirements and combined with the previous production design experience, a grand piano iron plate positioning device is designed and manufactured. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a grand piano iron plate positioning device and assembly method. This positioning device can be used to improve the positioning accuracy between the grand piano iron plate, the peg plate and the back frame, and gets rid of the dependence of manual operation on assembly experience. The operation is more convenient and the assembly time is saved. At the same time, it can meet the repeated disassembly and assembly of the iron plate during mass production, and the iron plate of the same model can be quickly replaced.

[0008] In order to achieve the above technical features, the object of the present invention is achieved as follows: a grand piano iron plate positioning device, comprising an iron plate treble positioning device for positioning the treble area of ​​the piano iron plate, the iron plate treble positioning device being positioned between the treble area of ​​the piano iron plate and the back frame crossbeam of the piano back frame; It also includes an iron plate bass positioning device 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 crossbeam of the piano back frame.

[0009] The iron plate bass positioning device includes a bass positioning base plate, a bass counterweight block is vertically fixed to one end of the top of the bass positioning base plate by a first bolt, a limiting column is vertically fixed to the other end of the top of the bass positioning base plate by a second bolt, a bass positioning plate is fixed to the top of the limiting column by a third bolt, and a first positioning hole and a second positioning hole are processed on the bass positioning plate.

[0010] The limiting column includes a column body in the middle, and both ends of the column body are flange structures, and the flange structures are fixedly connected to the bass positioning bottom plate and the bass positioning plate through corresponding second bolts and third bolts respectively.

[0011] The first positioning hole and the second positioning hole correspond to and cooperate with the first iron plate tuning button hole and the second iron plate tuning button hole in the bass area of ​​the piano iron plate respectively.

[0012] The bass positioning bottom plate is positioned by the back frame crossbeam and the inner side of the back frame bass of the piano back frame.

[0013] The iron plate tweeter positioning device includes a tweeter positioning base plate, one end of the tweeter positioning base plate is fixedly installed with a tweeter counterweight block by a fourth bolt, the other end of the tweeter positioning base plate is fixedly installed with a tweeter limit plate by a fifth bolt, the top of the tweeter limit plate is fixedly installed with a tweeter positioning plate by a sixth bolt, and a positioning tip is provided at the center of the top of the tweeter positioning plate.

[0014] The treble positioning bottom plate is positioned by the back frame crossbeam and the inner side surface of the back frame treble of the piano back frame.

[0015] The positioning tip is positioned and matched with the central hole of the lower nut rib in the treble area of ​​the piano iron plate.

[0016] A method for positioning and assembling an iron plate of a grand piano, wherein the method is implemented by using the iron plate positioning device of the grand piano, and comprises the following steps: Step 1: Material preparation: Place the piano back frame horizontally on the work platform, place the piano pin plate and piano iron plate at the corresponding positions on the piano back frame, use quick clamps to clamp the piano pin plate and piano iron plate together, and ensure that they fit together completely; Step 2: Quickly locate the high pitch area of ​​the piano iron plate: The treble positioning bottom plate of the iron plate treble positioning device is horizontally placed on the working platform, and is quickly moved to the empty position in the treble area of ​​the piano back frame, so that the two positioning surfaces of the treble positioning bottom plate fit in the angle formed by the beam surface of the back frame cross beam in the empty space in the piano back frame and the inner surface of the back frame bass, and the position of the center hole of the lower nut rib in the treble area of ​​the piano iron plate is quickly moved according to the position of the positioning tip of the iron plate treble positioning device, so that the center position of the center hole of the lower nut rib in the treble area of ​​the iron plate is at the position of the positioning tip of the treble positioning plate; Step 3: Quickly locate the bass area of ​​the piano iron plate: Place the bass positioning bottom plate of the iron plate bass positioning device horizontally on the working platform, and quickly move it to an empty position in the bass area of ​​the piano back frame, so that the two positioning surfaces of the bass positioning bottom plate fit in the angle formed by the beam surface of the empty back frame cross beam in the piano back frame and the inner surface of the back frame bass, and quickly move the piano iron plate to position according to the center position of the first positioning hole and the second positioning hole of the iron plate bass positioning device, and align the first iron plate tuning button hole and the second iron plate tuning button hole in the bass area of ​​the piano iron plate with the center of the first positioning hole and the second positioning hole on the bass positioning plate one by one; Step 4: Piano Pinblock Assembly: According to the positions determined by the iron plate treble positioning device and the iron plate bass positioning device, the piano pinblock is assembled on the piano back frame using fastening screws and positioning wooden pins. After the assembly is completed, the accurate installation position of the piano iron plate can be obtained. At this point, the grand piano iron plate can be repeatedly disassembled and assembled in the subsequent processing procedures, and even replacing the same piano iron plate will not affect the precise position of the piano iron plate in the piano.

[0017] The present invention has the following beneficial effects: 1. The above positioning device can quickly complete the positioning of the iron plate of the grand piano, improve the positioning accuracy, get rid of the dependence of manual operation on installation experience, make the operation more convenient, and save installation time. In mass production, it can meet the repeated disassembly and assembly of the iron plate, and the iron plate of the same model can be quickly replaced.

[0018] 2. The above-mentioned iron plate bass positioning device can realize rapid and reliable positioning of the bass area of ​​the piano iron plate.

[0019] 3. The above-mentioned limiting columns can be used to reliably connect and fix the bass positioning base plate and the bass positioning plate.

[0020] 4. The above-mentioned iron plate high pitch positioning device can be used to quickly locate the high pitch area of ​​the piano iron plate.

[0021] 5. The treble region of the piano iron plate can be positioned by means of the positioning tip. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 For the present invention Figure 1 A partial enlarged view of the location of the tweeter positioning device on the middle iron plate.

[0025] Figure 3 For the present invention Figure 1 A partial enlarged view of the location of the bass positioning device in the middle iron plate.

[0026] Figure 4 It is the front view of the iron plate bass positioning device of the present invention.

[0027] Figure 5 It is a top view of the iron plate bass positioning device of the present invention.

[0028] Figure 6 It is the front view of the iron plate high-pitched sound positioning device of the present invention.

[0029] Figure 7 It is a side view of the iron plate tweeter positioning device of the present invention.

[0030] In the figure: piano iron plate 1, piano back frame 2, back frame crossbeam 3, iron plate bass positioning device 4, No. 2 iron plate tuning button hole 5, piano string pin plate 6, lower string nut rib center hole 7, iron plate treble positioning device 8, back frame treble inner side 9, back frame bass inner side 10, No. 1 iron plate tuning button hole 11; Bass weight block 401, first bolt 402, bass positioning bottom plate 403, second bolt 404, limiting column 405, third bolt 406, bass positioning plate 407, second positioning hole 408, first positioning hole 409; Treble positioning base plate 801 , fourth bolt 802 , tweeter counterweight block 803 , fifth bolt 804 , tweeter limiting plate 805 , sixth bolt 806 , tweeter positioning plate 807 , positioning tip 808 . DETAILED DESCRIPTION

[0031] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0032] Embodiment 1: See also Figure 1-7, a grand piano iron plate positioning device, including an iron plate treble positioning device 8 for positioning the treble area of ​​the piano iron plate 1, the iron plate treble positioning device 8 is positioned between the treble area of ​​the piano iron plate 1 and the back frame crossbeam 3 of the piano back frame 2; and also includes an iron plate bass positioning device 4 for positioning the bass area of ​​the piano iron plate 1, the iron plate bass positioning device 4 is positioned between the bass area of ​​the piano iron plate 1 and the back frame crossbeam 3 of the piano back frame 2. The above-mentioned positioning device can quickly complete the positioning of the iron plate of the grand piano, improve the positioning accuracy of the installation, get rid of the dependence of manual operation on installation experience, make the operation more convenient, and save installation time. During mass production, the repeated disassembly and assembly of the iron plate can be met, and the iron plate of the same model can be quickly replaced.

[0033] Furthermore, the iron plate bass positioning device 4 comprises a bass positioning bottom plate 403, a bass counterweight 401 is vertically fixed to one end of the top of the bass positioning bottom plate 403 by a first bolt 402, a limiting column 405 is vertically fixed to the other end of the top of the bass positioning bottom plate 403 by a second bolt 404, a bass positioning plate 407 is fixed to the top of the limiting column 405 by a third bolt 406, and a first positioning hole 409 and a second positioning hole 408 are processed on the bass positioning plate 407. The above-mentioned iron plate bass positioning device 4 can realize the rapid and reliable positioning of the bass area of ​​the piano iron plate 1. During the positioning process, the bass positioning base plate 403 is placed horizontally on the work platform and quickly moved to an empty position in the bass area of ​​the piano back frame 2, so that the two positioning surfaces of the bass positioning base plate 403 fit into the angle formed by the beam surface of the empty back frame beam 3 in the piano back frame 2 and the inner surface 10 of the back frame bass, and the piano iron plate 1 is quickly moved to position according to the center position of the No. 1 positioning hole 409 and the No. 2 positioning hole 408 of the iron plate bass positioning device 4, and the No. 1 iron plate tuning button hole 11 and the No. 2 iron plate tuning button hole 5 in the bass area of ​​the piano iron plate 1 are aligned one by one with the center of the No. 1 positioning hole 409 and the No. 2 positioning hole 408 on the bass positioning plate 407.

[0034] Furthermore, the limiting column 405 includes a column in the middle, and the two ends of the column are flange structures, which are respectively fixedly connected to the bass positioning bottom plate 403 and the bass positioning plate 407 through the corresponding second bolts 404 and third bolts 406. The limiting column 405 can be used to reliably connect and fix the bass positioning bottom plate 403 and the bass positioning plate 407.

[0035] Furthermore, the first positioning hole 409 and the second positioning hole 408 correspond to the first iron plate tuning button hole 11 and the second iron plate tuning button hole 5 of 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 locate the bass area of ​​the piano iron plate 1.

[0036] Furthermore, the bass positioning bottom plate 403 is positioned by the back frame crossbeam 3 and the back frame bass inner side surface 10 of the piano back frame 2. The iron plate bass positioning device 4 can be reliably positioned by the above positioning surface.

[0037] Further, the iron plate treble positioning device 8 comprises a treble positioning bottom plate 801, one end of which is fixedly mounted with a treble counterweight 803 via a fourth bolt 802, the other end of which is fixedly mounted with a treble limiting plate 805 via a fifth bolt 804, the top of which is fixedly mounted with a treble positioning plate 807 via a sixth bolt 806, and a positioning tip 808 is disposed at the top center of the treble positioning plate 807. The above-mentioned iron plate treble positioning device 8 can be used to quickly locate the treble region of the piano iron plate 1. During the specific positioning process, the treble positioning base plate 801 is placed horizontally on the work platform and quickly moved to an empty position in the treble area of ​​the piano back frame 2, so that the two positioning surfaces of the treble positioning base plate 801 fit in the angle formed by the beam surface of the empty back frame crossbeam 3 in the piano back frame 2 and the inner surface 10 of the back frame bass, and the position of the lower nut rib center hole 7 in the treble area of ​​the piano iron plate 1 is quickly moved according to the position of the positioning tip 808 of the iron plate treble positioning device 8, so that the center position of the lower nut rib center hole 7 in the treble area of ​​the iron plate is at the position of the positioning tip 808 of the treble positioning plate 807.

[0038] Furthermore, the treble positioning bottom plate 801 is positioned by the back frame crossbeam 3 and the back frame treble inner side surface 9 of the piano back frame 2. The above positioning method can realize reliable positioning of the iron plate treble positioning device 8.

[0039] Furthermore, the positioning tip 808 is positioned and matched with the center hole 7 of the lower saddle bar in the treble area of ​​the piano iron plate 1. The treble area of ​​the piano iron plate 1 can be positioned by the positioning tip 808.

[0040] Embodiment 2: A method for positioning and assembling a grand piano iron plate, the method being implemented by using the grand piano iron plate positioning device, comprising the following steps: Step 1: Material preparation: Place the piano back frame 2 horizontally on the work platform, place the piano pin plate 6 and the piano iron plate 1 at the corresponding positions of the piano back frame 2, and use a quick clamp to clamp the piano pin plate 6 and the piano iron plate 1 together, and ensure that they are completely aligned with each other; Step 2: Quickly locate the high pitch area of ​​the piano iron plate: Place the treble positioning bottom plate 801 of the iron plate treble positioning device 8 horizontally on the work platform, and 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 fit in the angle formed by the beam surface of the empty back frame cross beam 3 in the piano back frame 2 and the inner side surface 10 of the back frame bass, and quickly move the position of the lower nut rib center hole 7 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 lower nut rib center hole 7 in the treble area of ​​the iron plate is at the position of the positioning tip 808 of the treble positioning plate 807; Step 3: Quickly locate the bass area of ​​the piano iron plate: Place the bass positioning bottom plate 403 of the iron plate bass positioning device 4 horizontally on the work platform, and quickly move it to an 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 fit in the angle formed by the beam surface of the empty back frame beam 3 in the piano back frame 2 and the inner side surface 10 of the back frame bass, and quickly move the piano iron plate 1 to position according to the center position of the No. 1 positioning hole 409 and the No. 2 positioning hole 408 of the iron plate bass positioning device 4, and align the No. 1 iron plate tuning button hole 11 and the No. 2 iron plate tuning button hole 5 in the bass area of ​​the piano iron plate 1 with the center of the No. 1 positioning hole 409 and the No. 2 positioning hole 408 on the bass positioning plate 407 one by one; Step 4: Assemble the piano pinblock 6: According to the positions determined by the iron plate treble positioning device 8 and the iron plate bass positioning device 4, the piano string pin plate 6 is assembled on the piano back frame 2 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. At this point, the grand piano iron plate can be repeatedly disassembled and assembled in the subsequent processing steps, and even replacing the same piano iron plate 1 will not affect the precise position of the piano iron plate 1 in the piano.

Claims

1. A grand piano iron plate positioning device, characterized in that: It comprises an iron plate treble positioning device (8) for positioning the treble region of the piano iron plate (1), wherein the iron plate treble positioning device (8) is positioned between the treble region of the piano iron plate (1) and the back frame crossbeam (3) of the piano back frame (2); It also comprises an iron plate bass positioning device (4) for positioning the bass area of ​​the piano iron plate (1); the iron plate bass positioning device (4) is positioned between the bass area of ​​the piano iron plate (1) and the back frame crossbeam (3) of the piano back frame (2).

2. The grand piano iron plate positioning device according to claim 1, characterized in that: The iron plate bass positioning device (4) comprises a bass positioning bottom plate (403), a bass counterweight (401) being vertically fixed to one end of the top of the bass positioning bottom plate (403) via a first bolt (402), a limiting column (405) being vertically fixed to the other end of the top of the bass positioning bottom plate (403) via a second bolt (404), a bass positioning plate (407) being fixed to the top of the limiting column (405) via a third bolt (406), and a first positioning hole (409) and a second positioning hole (408) being processed on the bass positioning plate (407).

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

4. The grand piano iron plate positioning device according to claim 2, characterized in that: The first positioning hole (409) and the second positioning hole (408) correspond to and cooperate with the first iron plate tuning button hole (11) and the second iron plate tuning button hole (5) in the bass region of the piano iron plate (1), respectively.

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

6. The grand piano iron plate positioning device according to claim 1, characterized in that: The iron plate tweeter positioning device (8) comprises a tweeter positioning base plate (801), one end of the tweeter positioning base plate (801) being fixedly mounted with a tweeter counterweight (803) via a fourth bolt (802), the other end of the tweeter positioning base plate (801) being fixedly mounted with a tweeter limiting plate (805) via a fifth bolt (804), the top end of the tweeter limiting plate (805) being fixedly mounted with a tweeter positioning plate (807) via a sixth bolt (806), and a positioning tip (808) being provided at the center of the top end of the tweeter positioning plate (807).

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

8. The grand piano iron plate positioning device according to claim 6, characterized in that: The positioning tip (808) is positioned and matched with the center hole (7) of the lower nut rib in the treble area of ​​the piano iron plate (1).

9. A method for positioning and assembling an iron plate of a grand piano, characterized in that: The assembly method is implemented by using the grand piano iron plate positioning device according to any one of claims 1 to 8, and comprises the following steps: Step 1: Material preparation: Place the piano back frame (2) horizontally on the work platform, place the piano pin plate (6) and the piano iron plate (1) at the corresponding positions on the piano back frame (2), and use a quick clamp to clamp the piano pin plate (6) and the piano iron plate (1) together, and ensure that they are completely aligned with each other; Step 2: Quickly locate the high pitch area of ​​the piano iron plate: The treble positioning bottom plate (801) of the iron plate treble positioning device (8) is horizontally placed on the work platform, and is quickly moved to an empty position in the treble region of the piano back frame (2), so that the two positioning surfaces of the treble positioning bottom plate (801) fit in the angle formed by the beam surface of the back frame cross beam (3) in the empty space in the piano back frame (2) and the inner side surface (10) of the back frame bass, and the position of the lower nut rib center hole (7) of the treble region of the piano iron plate (1) is quickly moved according to the position of the positioning tip (808) of the iron plate treble positioning device (8), so that the center position of the lower nut rib center hole (7) of the iron plate treble region is at the position of the positioning tip (808) of the treble positioning plate (807); Step 3: Quickly locate the bass area of ​​the piano iron plate: The bass positioning bottom plate (403) of the iron plate bass positioning device (4) is horizontally placed on the working platform, and is quickly moved to an empty position in the bass region of the piano back frame (2), so that the two positioning surfaces of the bass positioning bottom plate (403) fit in the angle formed by the beam surface of the empty back frame beam (3) in the piano back frame (2) and the inner side surface (10) of the back frame bass, and the piano iron plate (1) is quickly moved to position according to the center position of the first positioning hole (409) and the second positioning hole (408) of the iron plate bass positioning device (4), and the first iron plate tuning button hole (11) and the second iron plate tuning button hole (5) in the bass region of the piano iron plate (1) are aligned one by one with the center of the first positioning hole (409) and the second positioning hole (408) on the bass positioning plate (407); Step 4: Assemble the piano pinblock (6): According to the positions determined by the iron plate treble positioning device (8) and the iron plate bass positioning device (4), the piano string pin plate (6) is assembled on the piano back frame (2) 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. At this point, the grand piano iron plate can be repeatedly disassembled and assembled in the subsequent processing steps, and even replacing the same piano iron plate (1) will not affect the accurate position of the piano iron plate (1) in the piano.

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