Noise-eliminating toy mechanical piano

Abstract

The utility model provides a kind of noise elimination toy mechanical piano, including bottom plate and sound cavity;The lower side of bottom plate is detachably connected with supporting leg by fastener, the upper side of bottom plate is installed with piano key by supporting seat, and piano key extends to the inside of sound cavity through the lower side of baffle;The sound emitting device that the upper side of piano key is located is provided in the sound cavity, and sound is emitted by the knocking of piano key;Noise elimination device is arranged in the inside of sound cavity, and the position of the end of piano key is provided with the support fixed on the top of bottom plate, the middle part of support is provided with rectangular perforation, and the top and bottom of rectangular perforation are provided with sound elimination gasket;The end of the piano key is installed between sound elimination gasket.The end of piano key is contacted with sound elimination gasket directly when it moves up and down in rectangular perforation in the utility model, and no noise is generated;The noise generated by the direct contact of the end of piano key and the hard material of support can be effectively eliminated;Make the sound of piano more pleasant.

Description

Technical Field

[0001] This invention relates to the field of children's music education toy technology, specifically to a noise-eliminating toy mechanical piano. Background Technology

[0002] A piano produces sound by the player pressing keys, which activate small wooden hammers inside the piano, striking the steel strings to produce sound. However, most toy pianos on the market today are electronic toy pianos.

[0003] Electronic toy pianos primarily use a combination of a plastic shell and electronic components to produce musical sounds by pressing keys. The entire sound production process relies on a simple frequency-crossover analog circuit, so the keyboard lacks a sense of force and the sound is rather mechanical and monotonous, failing to truly achieve the effect of simulation.

[0004] A small number of children's toy pianos use manganese iron bars as the sound-producing device. The sound is produced by striking the manganese iron bars via a striking mechanism connected to the keys. However, when a piano key is pressed, the key strikes the assembly on which it is attached, producing unwanted noise and affecting the sound quality. Summary of the Invention

[0005] To address the aforementioned technical problems of piano keys lacking tactile feedback and producing unwanted noise, this technical solution provides a noise-eliminating toy mechanical piano. By incorporating sound-absorbing pads in the noise-eliminating device, the piano keys can be prevented from colliding with the components housing the keys, thus effectively solving the aforementioned problems.

[0006] This invention is achieved through the following technical solution: A noise-eliminating toy mechanical piano includes a chassis and a sound cavity composed of the chassis, a cover plate, a left side plate, a right side plate, a rear side plate, and a partition. Support legs are detachably connected to the lower side of the chassis via fasteners. Piano keys are mounted on the upper side of the chassis via support seats, and the piano keys extend through the lower side of the partition into the sound cavity. Inside the sound cavity, a sound-generating device is provided above the piano keys to produce sound when struck. The noise-eliminating device is characterized by a support fixed to the top surface of the chassis, with a rectangular perforation in the middle of the support at the end of the piano key. Sound-eliminating pads are provided on both the top and bottom surfaces of the rectangular perforation. The ends of the piano keys are installed between the sound-eliminating pads.

[0007] Furthermore, the sound-absorbing pad includes sound-absorbing layers fixed to the top and bottom surfaces of the rectangular perforation, respectively.

[0008] Furthermore, the sound-absorbing pad includes a buffer layer and a sound-absorbing layer fixed from top to bottom on the top surface of the rectangular perforation, and a sound-absorbing layer fixed on the bottom surface of the rectangular perforation.

[0009] Furthermore, the sound-absorbing pad includes a buffer layer and a sound-absorbing layer that are fixed to the top and bottom surfaces of the rectangular perforation, respectively, and are fixed sequentially from the edge to the middle.

[0010] Furthermore, a sound-absorbing layer is fixedly installed on the bottom surface of the partition that contacts the piano keys.

[0011] Furthermore, the buffer layer is made of an elastic material, such as sponge, spring, silicone, or cotton; the sound-absorbing layer is made of felt or cotton cloth; and the thickness of the buffer layer is greater than that of the sound-absorbing layer.

[0012] Furthermore, the height of the rectangular perforation is the sum of the thickness of the sound-absorbing pads installed on the top and bottom surfaces of the rectangular perforation, plus the height of the piano key ends.

[0013] Furthermore, the piano key includes a key and a striking part. A support groove is provided in the lower part of the middle of the key. The support groove is wider at the bottom and narrower at the top, so that after the piano key is installed on the support base through the support groove, a gap can be formed between the bottom of the support groove and the support base, which can move when the key is pressed and the key is released.

[0014] Furthermore, the support base has a protrusion in the middle of each piano key, and a groove is formed between the protrusions. The groove corresponds to the support groove on the piano key. The bottom of the support base has a fixing component that extends to both sides, so that the support base can be more stable when it is installed on the base by fasteners.

[0015] Furthermore, a through hole with vertical openings is provided in the middle of the end of the key. The through hole is rectangular. A connecting rod is fixedly connected to the bottom of the striking part. The connecting rod has a turning point in the middle. The position of the turning point is installed in the through hole of the end of the key through a pivot. When the end of the piano key is installed on the noise silencing device, the tail of the connecting rod is locked between the silencing pads, the striking part is lifted, and there is no contact between the bottom of the striking part and the key. When the key is pressed, the tail of the connecting rod is pressed down, so that the striking part is lifted to a higher position and strikes the sound-producing device.

[0016] Furthermore, the sound-generating device includes a whole plate, one side of which is fixedly mounted with a string mounting seat by fasteners. A string is set on the string mounting seat at a position corresponding to each piano key. The diameter of the starting end of the string is smaller than the diameter of the string body, so that the string vibrates and produces sound when it is struck by the striking part of the piano key. The smaller diameter part of the string is more likely to vibrate and increases the vibration frequency, making the sound produced by the string more pleasant. In addition, the string lengths are inconsistent, so that the amplitude produced by each string is inconsistent, thus producing different tones.

[0017] Furthermore, a reinforcing plate is integrally fixed to the bottom of the inner side of the left and right side plates, from the front plate to the noise reduction device. The height of the reinforcing plate is flush with the height of the piano keys. This increases the contact area between the left and right side plates and the bottom plate, making the connection between the left and right side plates and the bottom plate more secure.

[0018] Furthermore, on the inner side of the left and right side plates, a partition mounting groove is provided at the position where the partition is installed, and the bottom edge of the partition mounting groove is flush with the top surface of the reinforcing plate; so that the sound-absorbing layer on the bottom surface of the partition contacts the top surface of the piano key.

[0019] Furthermore, the reinforcing block is partially raised at the location where the sound-generating device is installed, and a sound-generating device fixing block is fixed to the top surface of the raised part of the reinforcing block. The top surface of the sound-generating device fixing block is inclined, so that after the sound-generating device is installed, the piano strings are inclined above the piano keys.

[0020] Furthermore, on the bottom surface of the cover plate, at the left and right ends, there are 7-shaped connectors fixed with fasteners, and the connectors are provided with fixing holes; on the upper side of the left and right side plates, there are matching mounting holes at the positions corresponding to the fixing holes on the connectors; the fixing holes and mounting holes are fixedly connected by fasteners.

[0021] Furthermore, longitudinally arranged reinforcing strips are installed at the joints between the left and right side panels and the rear side panel, resulting in a better connection between the left and right side panels and the rear side panel.

[0022] Furthermore, a support foot reinforcement plate is fixed to the top surface of the chassis at the location where the support feet are installed, making the support feet more securely installed.

[0023] The noise-eliminating toy mechanical piano proposed in this invention has the following advantages compared with the prior art: This technical solution utilizes a noise-absorbing device located inside the sound cavity at the ends of the piano keys. The device includes a support fixed to the top surface of the chassis, with a rectangular perforation in the center of the support at the end of the piano key. Sound-absorbing pads are placed on both the top and bottom surfaces of the rectangular perforation. The ends of the piano keys are installed between these pads. This ensures that when the piano keys move up and down within the rectangular perforation, they directly contact the sound-absorbing pads, preventing noise. This effectively eliminates noise generated by direct contact between the piano key ends and the rigid material of the support, resulting in a more pleasant piano sound. Simultaneously, a sound-absorbing layer fixed to the bottom surface of the partition prevents mechanical noise from the piano keys colliding with the bottom surface of the partition.

[0024] In this technical solution, a sound-absorbing pad is installed on the top surface of a rectangular perforation, consisting of a buffer layer and a sound-absorbing layer fixed sequentially from top to bottom, and a sound-absorbing layer fixedly installed on the bottom surface of the rectangular perforation. The buffer layer is made of an elastic material, such as sponge, spring, silicone, or cotton; the sound-absorbing layer is made of felt or cotton cloth. This ensures that all parts of the piano that come into contact with the keys during movement have a sound-absorbing layer to eliminate noise, resulting in a clearer sound from the piano. Furthermore, the buffer layer provides a certain amount of cushioning force when the keys are pressed, relatively reducing the impact of the reaction force on the child's hand, making it easier for the child to play and increasing their comfort during the playing process.

[0025] This technical solution connects the keys to the striking part via a linkage, and coordinates the piano keys with the noise reduction device. When a key is pressed, the end of the linkage contacts the noise reduction pad, causing the pad to deform. Then, the linkage is pressed down again, causing the striking part to strike the strings of the sound-producing device to produce sound. This setting can increase the force of the keyboard strikes and simulate the feeling of striking the strings of a real piano.

[0026] This technical solution uses a support groove located at the bottom of the key, which is wider at the bottom and narrower at the top. This allows the bottom of the support groove to be spaced from the support base after the piano key is mounted on the support base, allowing it to move when the key is pressed and released.

[0027] In this technical solution, the key end has a through hole with vertical openings in the middle. The through hole is rectangular. The bottom of the striking part is fixedly connected to a connecting rod. The connecting rod has a turning point in the middle. The position of the turning point is installed in the through hole of the key end via a pivot. When the piano key end is installed on the noise silencing device, the tail of the connecting rod is locked between the silencing pads, the striking part is lifted, and there is no contact between the bottom of the striking part and the key. When the key is pressed, the tail of the connecting rod is pressed down, causing the striking part to be lifted to a higher position and strike the sound-producing device.

[0028] This technical solution uses a partition to create a sound cavity with the piano frame. The sound-producing device is installed inside the sound cavity. When the striking device strikes the sound-producing device, the emitted sound waves will reverberate within the sound cavity, creating a simulated echo. This makes the piano's tone more ethereal and mellow, and also increases the duration of the sound, making the piano's sound more pleasant and melodious. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0030] Figure 2 This is a top view of the overall structure of the present invention.

[0031] Figure 3 This is a schematic diagram showing the breakdown of the various modules of this invention.

[0032] Figure 4 This is a top view of the present invention after the acoustic cavity cover plate has been removed.

[0033] Figure 5 This is a schematic diagram of the present invention after the sound-generating device has been removed.

[0034] Figure 6 This is a schematic diagram of the support structure in this invention.

[0035] Figure 7 This is a schematic diagram of the noise reduction device in Embodiment 1 of the present invention.

[0036] Figure 8 This is a schematic diagram of the partition structure in this invention.

[0037] Figure 9 This is a structural diagram of the piano keys in this invention.

[0038] Figure 10 This is a schematic diagram of the installation state of the piano keys in this invention.

[0039] Figure 11 This is a schematic diagram of the state of the piano key striking device in this invention.

[0040] Figure 12 This is a structural diagram of the support base in this invention.

[0041] Figure 13 This is a structural diagram of the sound-generating device in this invention.

[0042] Figure 14 This is a schematic diagram of the noise reduction device in Embodiment 2 of the present invention.

[0043] Figure 15 This is a schematic diagram of the noise reduction device in Embodiment 3 of the present invention.

[0044] Figure 16 , 17 Figures 18, 19, and 20 are physical images of the present invention.

[0045] The labels in the attached diagram are as follows: 1-chassis, 2-cover plate, 3-left side plate, 4-right side plate, 5-rear side plate, 6-partition, 7-sound chamber, 8-support foot, 9-piano key, 91-key, 911-support groove, 912-through hole, 92-striking part, 93-connecting rod, 94-shaft, 10-front plate, 11-reinforcing plate, 12-partition mounting groove, 13-connector, 14-sound-generating device, 141-entire plate, 142-string mounting seat, 143-string, 15-reinforcing strip, 16-noise silencing device, 161-support, 162-buffer layer, 163-sound-absorbing layer, 17-support base, 18-sponge sound-absorbing pad. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. Example 1

[0047] like Figures 1-2 As shown, a noise-eliminating toy mechanical piano includes a chassis 1 and a sound cavity 7 composed of the chassis 1, a cover plate 2, a left side plate 3, a right side plate 4, a rear side plate 5, and a partition plate 6. A support leg 8 is detachably connected to the lower side of the chassis 1 via fasteners. Piano keys 9 are mounted on the upper side of the chassis 1 via a support base 17, extending through the lower side of the partition plate 6 into the sound cavity 7. A reinforcing plate 11, integrally fixed to the bottom inner sides of the left side plate 3 and the right side plate 4, is installed from the front plate 10 to the noise-eliminating device 16. The height of the reinforcing plate 11 is flush with the height of the piano keys 9. This increases the contact area between the left side plate 3 and the right side plate 4 and the chassis 1, making the connection between the left side plate 3 and the right side plate 4 and the chassis 1 more secure.

[0048] like Figure 3 As shown, on the inner side of the left side plate 3 and the right side plate 4, there is a partition mounting groove 12 at the position where the partition 6 is installed. The bottom edge of the partition mounting groove 12 is flush with the top surface of the reinforcing plate 11, so that the sound-absorbing layer on the bottom surface of the partition 6 contacts the top surface of the piano key 9.

[0049] On the bottom surface of the cover plate 2, at the left and right ends, there are 7-shaped connectors 13 fixed by fasteners, and the connectors 13 are provided with fixing holes; on the upper side of the left side plate 3 and the right side plate 4, there are matching mounting holes at the positions corresponding to the fixing holes on the connectors 13; after the fastening screw passes through the fixing hole and the mounting hole, it is fixedly connected by fastening screws.

[0050] like Figure 4 As shown, inside the sound cavity 7, a sound-generating device 14 is provided above the piano keys 9 to produce sound by striking the piano keys 9; the reinforcing plate 11 is partially raised at the position where the sound-generating device 14 is installed, and a sound-generating device fixing block is fixed on the top surface of the raised part of the reinforcing plate 11. The top surface of the sound-generating device 14 fixing block is inclined, so that after the sound-generating device 14 is installed, the piano strings 143 are inclined above the piano keys 9.

[0051] A longitudinally arranged reinforcing strip 15 is installed at the junction of the left side panel 3 and the right side panel 4 with the rear side panel 5. The reinforcing strip 15 increases the area of ​​the junction surface, making the junction between the left side panel 3 and the right side panel 4 and the rear side panel 5 better.

[0052] On the top surface of the chassis 1, at the location where the support foot 8 is installed, a support foot reinforcement plate is fixed. The reinforcement plate increases the length of the threaded hole, making the support foot 8 more securely installed.

[0053] like Figure 5 As shown, inside the sound cavity 7, a noise silencing device 16 is provided at the end of the piano key 9. The noise silencing device 16 includes a support 161 fixed to the top surface of the chassis 1; the ends of the piano key 9 are installed between the noise silencing pads.

[0054] like Figure 6 As shown, a rectangular perforation is provided in the middle of the support 161 at the end of the piano key 9. The height of the rectangular perforation is the sum of the thickness of the sound-absorbing pads installed on the top and bottom surfaces of the rectangular perforation and the height of the end of the piano key 9.

[0055] like Figure 7 As shown, both the top and bottom surfaces of the rectangular perforation are provided with sound-absorbing pads; the sound-absorbing pads include a buffer layer 162 and a sound-absorbing layer 163 installed on the top surface of the rectangular perforation and fixed from top to bottom, and a sound-absorbing layer 163 fixedly installed on the bottom surface of the rectangular perforation.

[0056] like Figure 8 As shown, a sound-absorbing layer 163 is fixedly installed on the bottom surface of the partition 6 where it contacts the piano key 9.

[0057] The buffer layer 162 is made of an elastic material, such as sponge, spring, silicone, or cotton; the sound-absorbing layer 163 can be made of felt or cotton cloth; the thickness of the buffer layer 162 is greater than the thickness of the sound-absorbing layer 163.

[0058] In this embodiment, the buffer layer 162 is a sponge layer, and the sound-absorbing layer 163 is a short felt material. The sponge layer and the short felt material are integrally formed on the top surface of the rectangular perforation. The top surface of the sponge layer is fixed to the top surface of the rectangular perforation with adhesive. The bottom surface of the short felt layer is fixed to the bottom surface of the rectangular perforation with adhesive. The distance between the upper and lower short felt layers is the thickness of the end of the piano key 9.

[0059] like Figure 9 As shown, the piano key 9 includes a key 91 and a striking part 92. A support groove 911 is provided in the lower part of the middle of the key 91, and the support groove 911 is wider at the bottom and narrower at the top. A through hole 912 is provided in the middle of the end of the key 91, and the through hole 912 is rectangular. A connecting rod 93 is fixedly connected to the bottom of the striking part 92. The connecting rod 93 has a turning point in the middle, and the position of the turning point is installed in the through hole 912 at the end of the key 91 via a pivot 94.

[0060] like Figure 10 As shown, after the piano key 9 is mounted on the support base 17 via the support groove 911, a gap is formed between the bottom of the support groove 911 and the support base 17, allowing movement when the key is pressed and released. A sponge sound-absorbing pad 18 is provided at the bottom of the end of the key 91 away from the striking part 92, and the sponge sound-absorbing pad 18 is fixed to the chassis 1 with adhesive. When the end of the piano key 9 is mounted on the noise reduction device 16, the tail of the connecting rod 93 is engaged between the sound-absorbing pads, the striking part 92 is lifted, and there is no contact between the bottom of the striking part 92 and the key 91.

[0061] like Figure 11 As shown, when button 91 is pressed, the end of button 91 tilts up, and the sponge layer and short felt layer deform under force. At the same time, the deformed sponge layer and short felt layer also press down the tail of connecting rod 93, causing the striking part 92 to rise to a higher position and strike the sound-producing device 14. The bottom of the end of button 91 away from the striking part 92 acts on the sponge sound-absorbing pad 18, which plays a role in buffering and sound absorption; at the same time, it can train the player's fingers to become familiar with the force used.

[0062] like Figure 12 As shown, on the support base 17, a protrusion is provided in the middle of each piano key 9, and a groove is formed between the protrusions. The groove corresponds to the support groove 911 on the piano key 9. The bottom of the support base 17 is provided with a fixing component that extends to both sides, so that the support base 17 can be more stable when it is installed on the base by fasteners.

[0063] like Figure 13 As shown, the sound-generating device 14 includes a plate 141. A string mounting seat 142 is fixedly installed on one side of the plate 141 by fasteners. A string 143 is provided on the string mounting seat 142 at a position corresponding to each piano key 9. The diameter of the starting end of the string 143 is smaller than the diameter of the main body of the string 143, so that the string 143 vibrates and produces sound when it is struck by the striking part 92 of the piano key 9. The smaller diameter part of the string 143 is more likely to vibrate and increases the vibration frequency, making the sound produced by the string 143 more pleasant. In addition, the length of the string 143 is not uniform, so that the amplitude produced by each string 143 is not uniform, thus producing different tones. Example 2

[0064] Based on Example 1, the sound-absorbing pad can also be made of sound-absorbing layers 163 on both the top and bottom, with the specific structure as follows: like Figure 14 As shown, sound-absorbing pads are provided on both the top and bottom surfaces of the rectangular perforation; the sound-absorbing pads include sound-absorbing layers 163 fixed to the top and bottom surfaces of the rectangular perforation respectively. The sound-absorbing layers 163 are made of short felt material.

[0065] On the top surface of the rectangular perforation, the top surface of the short felt layer is fixed to the top surface of the rectangular perforation with adhesive; on the bottom surface of the rectangular perforation, the bottom surface of the short felt layer is fixed to the bottom surface of the rectangular perforation with adhesive. The spacing between the upper and lower short felt layers is equal to the thickness of the piano key tip.

[0066] Therefore, the height of the rectangular perforation in Example 2 is less than the height of the rectangular perforation in Example 1.

[0067] The other structures in this embodiment, as well as the positional and connection relationships between the structures, are the same as in Embodiment 1. They will not be described again here. Example 3

[0068] Based on Example 1, the sound-absorbing pad can also be configured with a buffer layer 162 and a sound-absorbing layer 163 on both the top and bottom, with the specific structure as follows: like Figure 15 As shown, sound-absorbing pads are provided on both the top and bottom surfaces of the rectangular perforation; including a buffer layer 162 and a sound-absorbing layer 163, which are fixed to the top and bottom surfaces of the rectangular perforation respectively, from the edge to the middle. The sound-absorbing layer 163 is made of short felt material.

[0069] In this embodiment, the buffer layer 162 is a sponge layer, and the sound-absorbing layer 163 is a short felt material. On the top surface of the rectangular perforation, the sponge layer and the short felt material are integrally formed; the top surface of the sponge layer is fixed to the top surface of the rectangular perforation with adhesive; on the bottom surface of the rectangular perforation, the sponge layer and the short felt material are integrally formed; the bottom surface of the sponge layer is fixed to the bottom surface of the rectangular perforation with adhesive; the distance between the upper short felt layer and the lower short felt layer is the thickness of the piano key end.

[0070] Therefore, the height of the rectangular perforation in Example 3 is less than the height of the rectangular perforation in Example 1.

[0071] The other structures in this embodiment, as well as the positional and connection relationships between the structures, are the same as in Embodiment 1. They will not be described again here.

[0072] Of the three embodiments described above, considering both usability and cost-effectiveness, Embodiment 1 is the best embodiment. Embodiment 2 has slightly less resilience but offers the best economic benefit; Embodiment 3 has a slightly higher cost but offers the best usability. Therefore, it can also be an embodiment of this solution.

Claims

1. A noise-eliminating toy mechanical piano, comprising a chassis (1) and a sound cavity (7) composed of the chassis (1), a cover plate (2), a left side plate (3), a right side plate (4), a rear side plate (5), and a partition plate (6); a support foot (8) is detachably connected to the lower side of the chassis (1) by fasteners, and piano keys (9) are mounted on the upper side of the chassis (1) by a support base (17), the piano keys (9) extending through the lower side of the partition plate (6) into the sound cavity (7); a sound-producing device (14) for striking the piano keys (9) is provided above the piano keys (9) in the sound cavity (7); characterized in that: Inside the sound cavity (7), a noise silencing device (16) is provided at the end of the piano key (9). The noise silencing device (16) includes a support (161) fixed to the top surface of the chassis (1). A rectangular perforation is provided in the middle of the support (161) at the end of the piano key (9). A sound-absorbing pad is provided on the top and bottom surfaces of the rectangular perforation. A buffer layer (162) is provided in the sound-absorbing pad. The buffer layer (162) is made of an elastic material. The end of the piano key (9) is installed between the sound-absorbing pads. The piano key (9) includes a key (91) and a striking part (92). A sponge sound-absorbing pad (18) is provided at the bottom of the end of the key (91) away from the striking part (92). An upper sound-absorbing pad is provided in the middle of the end of the key (91). A through hole (912) is provided at the bottom. The through hole (912) is rectangular. A connecting rod (93) is fixedly connected to the bottom of the striking part (92). A turning point is provided in the middle of the connecting rod (93). The position of the turning point is installed in the through hole (912) at the end of the key (91) through a pivot (94). When the end of the piano key (9) is installed on the noise silencing device (16), the tail of the connecting rod (93) is locked between the silencing pads. The striking part (92) is lifted up, and there is no contact between the bottom of the striking part (92) and the key (91). When the key (91) is pressed, the tail of the connecting rod (93) contacts the silencing pad and is pressed down by the action of the silencing pad, so that the striking part (92) is lifted to a higher position and strikes the sound-generating device (14).

2. The noise-eliminating toy mechanical piano according to claim 1, characterized in that: The sound-absorbing pad includes sound-absorbing layers (163) fixed to the top and bottom surfaces of the rectangular perforation, respectively.

3. The noise-eliminating toy mechanical piano according to claim 1, characterized in that: The sound-absorbing pad includes a buffer layer (162) and a sound-absorbing layer (163) fixed from top to bottom on the top surface of the rectangular perforation, and a sound-absorbing layer (163) fixed on the bottom surface of the rectangular perforation.

4. The noise-eliminating toy mechanical piano according to claim 1, characterized in that: The sound-absorbing pad includes a buffer layer (162) and a sound-absorbing layer (163) that are fixed to the top and bottom surfaces of the rectangular perforation, respectively, from the edge to the middle.

5. A noise-eliminating toy mechanical piano according to any one of claims 1-4, characterized in that: A sound-absorbing layer (163) is fixedly installed on the bottom surface of the partition (6) that contacts the piano key (9).

6. The noise-eliminating toy mechanical piano according to claim 5, characterized in that: The buffer layer (162) is made of sponge, spring, silicone or cotton; the sound-absorbing layer (163) is made of felt or cotton; the thickness of the buffer layer (162) is greater than the thickness of the sound-absorbing layer (163).

7. A noise-eliminating toy mechanical piano according to any one of claims 1-4, characterized in that: The height of the rectangular perforation is the sum of the thickness of the sound-absorbing pads installed on the top and bottom surfaces of the rectangular perforation, plus the height of the end of the piano key (9).

8. A noise-eliminating toy mechanical piano according to any one of claims 1-4, characterized in that: The lower part of the middle of the key (91) is provided with a support groove (911). The support groove (911) is wider at the bottom and narrower at the top, so that after the piano key (9) is installed on the support base (17) through the support groove (911), a gap can be formed between the bottom of the support groove (911) and the support base (17), which can move when the piano key is pressed and the piano key is released.

9. A noise-eliminating toy mechanical piano according to claim 8, characterized in that: The sound-generating device (14) includes a whole plate (141), one side of which is fixedly mounted with a string mounting seat (142) by fasteners. A string (143) is provided on the string mounting seat (142) at a position corresponding to each piano key (9). The diameter of the starting end of the string (143) is smaller than the diameter of the main body of the string (143).

10. A noise-eliminating toy mechanical piano according to any one of claims 1-4, characterized in that: At the bottom of the inner side of the left side plate (3) and the right side plate (4), an integrally fixed reinforcing plate (11) is installed from the front end to the position of the noise silencing device (16). The height of the reinforcing plate (11) is flush with the height of the piano key (9). At the position where the partition plate (6) is installed, a partition plate mounting groove (12) is provided on the inner side of the left side plate (3) and the right side plate (4). The bottom edge of the partition plate mounting groove (12) is flush with the top surface of the reinforcing plate (11). The reinforcing plate (11) is partially raised at the position where the sound-generating device (14) is installed, and a sound-generating device fixing block is fixed on the top surface of the raised part of the reinforcing plate (11). The top surface of the sound-generating device fixing block is inclined, so that after the sound-generating device (14) is installed, the piano string (143) is inclined above the piano key (9).

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