A piano auxiliary training device

Abstract

The invention relates to the technical field of auxiliary practice, and specifically to an auxiliary piano practice device, comprising a wide-angle camera, a single-chip microcomputer, a lamp head and a motor. The wide-angle camera is used to identify piano keys, the single-chip microcomputer is used to control the on and off of the lamp head, and the single-chip microcomputer is used to control the start and stop of the motor and the interval time of the start and stop, so that the vertical axis is driven to rotate by the motor, and then the connecting piece and the lamp head are driven to rotate to a set position and then the lamp head is started, so that the light generated by the lamp head is irradiated on the keys that need to be pressed, thereby playing a role in assisting piano practice. The design is convenient for application on a piano keyboard with raised black keys and an electronic keyboard with a number of keys different from that of a piano, and can also be applied to a hand-rolled piano keyboard with a horizontal surface. It is widely used, easy to carry, and convenient to use.

Description

Technical Field

[0001] The invention relates to a piano auxiliary practice device, belonging to the technical field of auxiliary practice. Background Art

[0002] As people's living standards and artistic accomplishments improve, more and more people are learning piano. For piano beginners, since their music foundation is weak, finding the corresponding keys according to the score is a big learning obstacle. Therefore, during the playing process, they are not familiar with the five-line score and the position of the piano keys, and it is inevitable that they will make key mistakes or note duration errors, especially when they cannot get immediate guidance and correction when practicing at home.

[0003] A piano practice aid with Chinese patent publication number: CN109785710A is provided with a film with multiple indicator lights, which is used to cover the piano. The keys that need to be operated in real time are displayed by turning on and off the lights, thereby playing the role of piano practice guidance. However, in this solution, the piano practitioner folds the film part of the film-shaped prompt module longitudinally and places it on the root of the piano keys. Because the keys on the piano include black keys and white keys, and the black keys protrude from the white keys, when installing the above-mentioned indicator film, it needs to be inserted between two adjacent black keys one by one, which is cumbersome to operate and the insertion position is prone to errors. In addition, if the protruding surface of the black keys is taken into consideration, the indicator film can only be applied to the key practice on the piano, but is not applicable to the piano keyboard stickers with a flat surface that are often used to practice piano proficiency in practice, and has a narrow scope of use. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a piano auxiliary practice device.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a piano auxiliary practice device, including an upper cover, a wide-angle camera and a Bluetooth serial port device connection port are fixed on the annular side end of the upper cover, an arc-shaped connecting plate is clamped on the lower end of the upper cover, the lower end of the arc-shaped connecting plate is fixed to the lower cover, a motor is fixed to the bottom end of the lower cover, a vertical axis is installed on the upper end of the motor, the vertical axis is arranged inside the upper cover, a connecting piece is fixed on the side end of the vertical axis, a lamp head is installed on the end of the connecting piece away from the vertical axis, the lamp head is arranged inside the arc-shaped connecting plate, a groove is provided at the front end of the arc-shaped connecting plate, the lamp head passes through the groove and extends to the outside of the lamp head, a single-chip microcomputer for controlling the lamp head and the motor is provided between the upper cover and the lower cover, and the single-chip microcomputer is provided on the upper side of the vertical axis.

[0006] Furthermore, the connecting part includes a hollow tube fixed at the side end of the vertical axis, a conductive rod is provided inside the hollow tube, the conductive rod extends from the front end of the hollow tube, the conductive rod extends from the back to the front to the inside of the lamp holder and is electrically connected to the lamp holder, and the conductive rod is detachably connected to the lamp holder.

[0007] Furthermore, a shielding plate is mounted on the annular outer end of the lamp holder, the outer end surface of the shielding plate is fitted with the inner wall of the arc-shaped connecting plate, and the upper and lower end surfaces of the shielding plate are respectively fitted with the upper cover and the lower cover.

[0008] Furthermore, the baffle plate includes a guide slider, a first arc groove is provided on the annular inner wall of the arc connecting plate, the guide slider is slidably installed inside the first arc groove, the inner wall of the guide slider fixes the arc-shaped round rod through a connecting rod, and arc-shaped dust shield plates are installed at the left and right positions of the arc-shaped round rod, and a compression spring is provided between the two arc-shaped dust shield plates and the connecting rod, and the two compression springs are installed on the arc-shaped round rod. The two arc-shaped dust shield plates are spliced ​​together and the lamp head is clamped between the two arc-shaped dust shield plates, and a limit plate is fixed at the annular outer end of the lamp head, and the front end surface of the limit plate fits the two arc-shaped dust shield plates.

[0009] Furthermore, an annular bevel groove is provided at the upper end of the arc-shaped connecting plate, a clamping groove is provided inside the arc-shaped connecting plate and the clamping groove is arranged at the lower end of the annular bevel groove, an annular plate is fixed at the lower end of the upper cover, the outer end surface of the annular plate is rotatably connected to an L-shaped rod, a third spring is fixed between the L-shaped rod and the annular plate, the annular plate passes through the annular bevel groove and extends to the inside of the clamping groove, and the end of the L-shaped rod is clamped in the inside of the clamping groove.

[0010] Furthermore, a circular through groove is provided at the outer end of the arc-shaped connecting plate, and the circular through groove is connected to the third spring.

[0011] Furthermore, a device switch is fixed at the upper end of the upper cover, a power connection port is provided at the lower end of the lower cover, and the single-chip microcomputer is electrically connected to the wide-angle camera, the device switch, the Bluetooth serial port device connection port, the power connection port, the conductive rod and the motor respectively.

[0012] The beneficial effects of the present invention are as follows: 1. The piano keys are identified by a wide-angle camera, the lighting of the lamp head is controlled by a single-chip microcomputer, and the start and stop of the motor as well as the start and stop interval time are controlled by the single-chip microcomputer, so that the vertical axis is driven to rotate by the motor, and then the connecting part and the lamp head are driven to rotate to the set position and then the lamp head is started, so that the light generated by the lamp head is illuminated on the keys that need to be pressed, thereby playing a role in assisting piano practice. This design is easy to apply to piano keyboards with raised black keys and electronic keyboards with a number of keys different from that of piano keys. It can also be applied to hand-rolled piano keyboards with a horizontal surface. It is widely used, easy to carry, and easy to use.

[0013] 2. The motor and the lamp holder are detachably connected through the conductive rod, the hollow tube and the vertical axis. When the lamp holder is damaged, it is easy to replace. Only one lamp holder can indicate multiple keys, which greatly reduces the number of lamp holders used. When the lamp holder is damaged, it is easy to find and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0015] Figure 1 A three-dimensional diagram of a piano auxiliary practice device according to the present invention;

[0016] Figure 2 A bottom view of a piano auxiliary practice device according to the present invention;

[0017] Figure 3 It is a schematic diagram of the interior of a piano auxiliary practice device of the present invention;

[0018] Figure 4 for Figure 3 A partial enlarged view of the middle B part;

[0019] Figure 5 for Figure 3 Sectional view of AA in the middle;

[0020] Figure 6 for Figure 5 A partial enlarged view of the middle C part;

[0021] Figure 7 A front view of a piano auxiliary practice device;

[0022] Figure 8 for Figure 7 A partial enlarged view of the middle D part;

[0023] Fig. 9 A circuit diagram of a lamp holder in a piano auxiliary practice device of the present invention;

[0024] In the figure: 1. upper cover, 2. wide-angle camera, 3. device switch, 4. Bluetooth serial port device connection port, 5. lower cover, 6. power connection port, 8. single-chip microcomputer, 71. arc-shaped connecting plate, 72. shielding plate, 73. lamp holder, 74. conductive rod, 75. hollow cylinder, 76. conductive spring, 77. conductive block, 78. vertical axis, 79. motor, 101. ring plate, 102. arc-shaped piston rod, 103. L-shaped Rod, 104, airbag, 105, third spring, 106, annular tube, 107, connecting tube, 211, arc-shaped rack, 212, gear, 213, grip rod, 711, slot, 712, round through slot, 713, annular bevel slot, 721, arc-shaped dust shield, 723, arc-shaped round rod, 724, compression spring, 725, connecting rod, 726, guide slider, 732, limit plate, 1022, arc-shaped slot. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0026] First embodiment: Please refer to Figure 1-Figure 3 as well as Fig. 9 A piano auxiliary exerciser comprises an upper cover 1, a wide-angle camera 2 for identifying piano keys and a Bluetooth serial port device connection port 4 for connecting the product end of the exerciser with a mobile phone end are fixed at the annular side end of the upper cover 1, an arc-shaped connecting plate 71 is clamped at the lower end of the upper cover 1, a lower cover 5 is fixed at the lower end of the arc-shaped connecting plate 71, a motor 79 is fixed at the bottom end of the lower cover 5, a vertical shaft 78 is installed at the upper end of the motor 79, the vertical shaft 78 is arranged inside the upper cover 1, a connecting piece is fixed at the side end of the vertical shaft 78, a lamp head 73 is installed at the end of the connecting piece away from the vertical shaft 78, the lamp head 73 is arranged inside the arc-shaped connecting plate 71, a groove is provided at the front end of the arc-shaped connecting plate 71, the lamp head 73 passes through the groove and extends to the outside of the lamp head 73, the design of the groove enables the lamp head 73 to move smoothly inside the groove, a single-chip microcomputer 8 for controlling the lamp head 73 and the motor 79 is provided between the upper cover 1 and the lower cover 5, the single-chip microcomputer 8 is arranged on the upper side of the vertical shaft 78, and the lower end of the single-chip microcomputer 8 is fixedly connected to the bottom end of the lower cover 5 through two supporting rods.

[0027] The wide-angle camera 2 is used to identify the piano keys, the single-chip computer 8 is used to control the on and off of the lamp head 73, and the single-chip computer 8 is used to control the start and stop of the motor 79 as well as the start and stop interval time, so that the vertical axis 78 is driven to rotate by the motor 79, and then the connecting part and the lamp head 73 are driven to rotate to the set position and then the lamp head 73 is started, so that the light generated by the lamp head 73 is illuminated on the keys that need to be pressed, thereby playing a role in assisting piano practice. This design is easy to use on piano keyboards with raised black keys and electronic keyboards with a different number of keys from the number of piano keys. It can also be used on hand-rolled piano keyboards with a horizontal surface. It is widely used, easy to carry, and convenient to use.

[0028] Second embodiment: Please refer to Figure 4 as well as Figure 5The connecting piece includes a hollow cylinder 75 fixed to the side end of the vertical shaft 78, a conductive rod 74 is provided inside the hollow cylinder 75, and the conductive rod 74 extends from the front end of the hollow cylinder 75. The conductive rod 74 extends from the back to the front to the inside of the lamp holder 73 and is electrically connected to the lamp holder 73. The outer end of the conductive rod 74 is sheathed with an insulating function 741, and 741 runs through the front end of the hollow cylinder 75 to guide the forward and backward movement of the conductive rod 74. A conductive block 77 connected to a conductive spring 76 is provided on the inner wall of the hollow cylinder 75 for power signal transmission. The conductive rod 74 is detachably connected to the lamp holder 73. The detachable connection between the motor 79 and the lamp holder 73 is realized by the conductive rod 74, the hollow cylinder 75 and the vertical shaft 78. When the lamp holder 73 is damaged, it is easy to replace. Only one lamp holder 73 can indicate multiple positions of the piano keys, which greatly reduces the number of lamp holders 73. When the lamp holder 73 is damaged, it is easy to be found and replaced.

[0029] The annular outer end of the lamp holder 73 is fitted with a shielding plate 72 for shielding the groove. The outer end surface of the shielding plate 72 is in contact with the inner wall of the arc-shaped connecting plate 71, and the upper and lower end surfaces of the shielding plate 72 are respectively in contact with the upper cover 1 and the lower cover 5. Although the design of the groove facilitates the movement of the lamp holder 73, the existence of the groove allows dust in the environment to easily enter the interior of the upper cover 1 and the lower cover 5. Therefore, a shielding plate 72 for shielding dust is added to prevent dust from entering.

[0030] The shielding plate 72 includes a guide slider 726, and a first arc groove is provided on the annular inner wall of the arc connecting plate 71. The guide slider 726 is slidably installed inside the first arc groove. The inner wall of the guide slider 726 fixes the arc rod 723 through a connecting rod 725. The left and right positions of the arc rod 723 are both equipped with arc dust shield plates 721. Compression springs 724 are provided between the two arc dust shield plates 721 and the connecting rod 725. The two compression springs 724 are both mounted on the arc rod 723. The two arc dust shield plates 721 are spliced ​​together and the lamp holder 73 is clamped between the two arc dust shield plates 721. Rubber plates are fixed at the positions where the two arc dust shield plates 721 contact the lamp holder 73 to achieve a buffering and protective effect on the lamp holder 73. A limit plate 732 is fixed at the annular outer end of the lamp holder 73, and the front end surface of the limit plate 732 fits the two arc dust shield plates 721.

[0031] The conductive spring 76 is in a compressed state. The conductive spring 76 realizes the function of power signal transmission on one hand, and squeezes the conductive rod 74 on the other hand, so that the limit plate 732 is closely attached to the rear end of the arc dust shield 721, thereby realizing a stable connection between the lamp head 73 and the arc dust shield 721.

[0032] The arc-shaped racks 211 are fixed at the relative positions of the rear parts of the two arc-shaped dust shields 721. The bottom end of the lower cover 5 is rotatably connected to the gear 212. The front and rear ends of the gear 212 are respectively meshed and connected with the two arc-shaped racks 211. The upper end of the gear 212 is installed with a gripping rod 213. By rotating the gripping rod 213, the gear 212 is driven to rotate, and then the two arc-shaped racks 211 are driven to move, so that the rear ends of the two arc-shaped dust shields 721 move toward the connecting rod 725, so that the two arc-shaped dust shields 721 are separated. At this time, the lamp holder 73 can be moved forward, so that the lamp holder 73 can be easily disassembled.

[0033] In order to improve the rotation stability of the arc dust shield 721, a second arc groove can be opened on the inner wall of the arc dust shield 721, and an arc block slidably connected to the second arc groove is fixed at the bottom end of the lower cover 5 to provide auxiliary support for the arc dust shield 721.

[0034] Third embodiment: Please refer to Figure 6-Figure 8 The upper end of the arc-shaped connecting plate 71 is provided with an annular bevel groove 713, the annular bevel groove 713 is an annular groove and the outer wall of the groove is an inclined surface, the arc-shaped connecting plate 71 is provided with a clamping groove 711 inside and the clamping groove 711 is arranged at the lower end of the annular bevel groove 713, the lower end of the upper cover 1 is fixed with an annular plate 101, the outer end surface of the annular plate 101 is rotatably connected with the L-shaped rod 103, the third spring 105 is fixed between the L-shaped rod 103 and the annular plate 101, the annular plate 101 passes through the annular bevel groove 713 and extends to the inside of the clamping groove 711, and the end of the L-shaped rod 103 is clamped in Inside the slot 711, when the upper cover 1 is connected to the lower cover 5, the annular plate 101 is moved downward into the annular bevel groove 713 of the arc-shaped connecting plate 71. Since the outer wall of the annular bevel groove 713 is an inclined surface, the L-shaped rod 103 can be pushed to rotate toward the annular plate 101. At this time, the third spring 105 is compressed. When the end of the L-shaped rod 103 enters the slot 711, the L-shaped rod 103 moves in the direction away from the annular plate 101 under the elastic force of the third spring 105, thereby being clamped in the slot 711.

[0035] The outer end of the arc-shaped connecting plate 71 is provided with a round through groove 712, which is connected to the third spring 105. The thin rod is passed through the round through groove 712 to push the end of the L-shaped rod 103 toward the annular plate 101, and then the upper cover 1 is moved upward, so that the upper cover 1 and the lower cover 5 can be disassembled. In practice, in order to improve the tightness of the connection between the upper cover 1 and the lower cover 5, at least two L-shaped rods 103 and the slots 711 are often provided. If at least two thin rods are passed through the corresponding round through grooves 71 at the same time, 2 and push the corresponding L-shaped rod 103 to move, the actual operation is difficult, so the annular plate 101 can be provided with arc grooves 1022 of the same number as the L-shaped rod 103, and the arc-shaped piston rods 102 extending outward are arranged inside the arc grooves 1022, the annular plate 101 is connected to the corresponding arc-shaped piston rods 102 through a plurality of elastic ropes, and an annular tube 106 is arranged at the outer end of the annular plate 101, so that the annular tube 106 is connected to at least two arc-shaped piston rods 102 away from the arc-shaped piston rods 102. The ends of the arc groove 1022 are connected, and an airbag 104 is set between the annular plate 101 and one of the L-shaped rods 103, so that the airbag 104 is connected with the arc groove 1022 at the corresponding position. When the thin rod pushes the L-shaped rod 103 at this position through the round groove 712, the L-shaped rod 103 rotates toward the annular plate 101 and squeezes the airbag 104, so that the gas in the airbag 104 enters the corresponding arc groove 1022 through the connecting tube 107, on the one hand, pushing the arc piston rod 102 at this position to move outward from the arc groove 1022, on the other hand, the gas in the arc groove 1022 at this position enters the inside of other arc grooves 1022 through the annular tube 106, pushing the arc piston rods 102 at all positions to move outward, so that the outward moving arc piston rod 102 pushes the L-shaped rod 103 at the corresponding position to move toward the annular plate 101, so as to achieve the function of unlocking all L-shaped rods 103 by only pushing one of the L-shaped rods 103.

[0036] The device switch 3 is fixed at the upper end of the upper cover 1, and a power connection port 6 is provided at the lower end of the lower cover 5. The single-chip microcomputer 8 is electrically connected to the wide-angle camera 2, the device switch 3, the Bluetooth serial port device connection port 4, the power connection port 6, the conductive rod 74 and the motor 79 respectively. A transistor is also added to the circuit connecting the single-chip microcomputer 8 and the lamp holder 73.

[0037] Working principle: A bracket can be set at the bottom of the present invention, and the present invention can be placed at a suitable position in front of the keyboard. The mobile phone can connect the single-chip computer 8 at the mobile phone end and the product end through the serial communication via the Bluetooth serial port device connection port 4.

[0038] Product initialization calibration: The product needs to be initially calibrated when used on different keyboards. Each key is identified by a wide-angle camera 2 (color) and partitioned into blocks. The information obtained is projected onto the screen of a mobile phone or tablet computer. After the key is identified, it is fed back to the microcontroller 8, and then the microcontroller 8 receives a signal to start the lamp head 73 and the motor 79 that controls the movement of the lamp head 73. After the motor 79 works and drives the lamp head 73 to rotate a certain angle, the lamp head 73 is started. Each time the light is projected onto the corresponding area within the size of each key, it is considered that the calibration is successful. During calibration, the user can adjust the product position according to the information on the screen feedback to assist in calibration.

[0039] Product operation: The music score is converted into binary 0,1 signals through the decoding program and stored in the database. Then the mobile phone sends a certain music score (0,1 signals) to the product through Bluetooth. After receiving the signal, the single-chip microcomputer 8 of the product transmits the signal to the control system of the motor 79, so that the motor 79 works, and the vertical shaft 78, the connecting piece and the lamp head 73 are driven by the motor 79 to rotate to the set position according to the signal. At this time, the control system of the motor 79 transmits the signal of moving into position back to the single-chip microcomputer 8, and the single-chip microcomputer 8 is turned on by the control transistor, and the single-chip microcomputer 8 gives the transistor a signal. Tube signal, after the transistor is turned on, controls the lamp head 73 to start lighting up, and after the user presses the key position illuminated by the lamp head 73, the single-chip microcomputer 8 controls the lamp head 73 to turn off and dim again, and then uses the motor 79 to drive the lamp head 73 to rotate to the position of the next key, and so on, thereby realizing the traction projection of the lamp head 73, and the user can press the key following the position of the light irradiation to realize the function of auxiliary practice. After the signal transmission of the single-chip microcomputer 8 is completed, it means that a song has ended, and the single-chip microcomputer 8 returns the information to the mobile phone through the Bluetooth serial port for the user to make the next choice.

[0040] Principle of learning error correction: The learning error correction function is also started in real time during system operation. The wide-angle camera 2 captures and identifies the keys pressed by the user during practice and the key positions where the light is pulled, and the system determines whether the practice is wrong. If an error occurs, the external chip of the wide-angle camera 2 gives a signal to the single-chip microcomputer 8. After the single-chip microcomputer 8 processes the signal, the running program of the motor 79 is paused, and the single-chip microcomputer 8 transmits a signal to the transistor. The transistor controls the light to always project the light in the correct position. After the user has practiced correctly, the wide-angle camera 2 captures that the keys pressed by the user during practice and the key positions where the light is pulled are in the same area. After the system determines that it is correct, the external chip of the wide-angle camera 2 gives a signal to the single-chip microcomputer 8, and the single-chip microcomputer 8 controls the program to continue to operate according to the original setting for the next step, and the light traction will perform the next step of projection traction.

[0041] Principle of light brightness and duration control: users will have different command reaction times in the initial stage. The time is controlled by code timer effect using automatic reloading and timer frequency division. The time can be adjusted at will. MATLAB is used to arrange and calculate the huge array and put the obtained fixed value interval into the timer. Users can set the time within 0.5s-5s through the mobile phone according to their own reaction speed and song proficiency to control the speed of light on and off and the time when the motor stops to achieve the change of practice speed.

[0042] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A piano auxiliary practice device, characterized in that: The invention comprises an upper cover (1), wherein a wide-angle camera (2) and a Bluetooth serial port device connection port (4) are fixed on the annular side end of the upper cover (1), an arc-shaped connecting plate (71) is clamped on the lower end of the upper cover (1), the lower end of the arc-shaped connecting plate (71) is fixed to the lower cover (5), a motor (79) is fixed to the bottom end of the lower cover (5), a vertical shaft (78) is installed on the upper end of the motor (79), the vertical shaft (78) is arranged inside the upper cover (1), and the side end of the vertical shaft (78) is fixed a connecting member, wherein a lamp holder (73) is mounted on one end of the connecting member facing away from the vertical axis (78), the lamp holder (73) being arranged inside the arc-shaped connecting plate (71), a groove being provided at the front end of the arc-shaped connecting plate (71), the lamp holder (73) passing through the groove and extending to the outside of the lamp holder (73), a single-chip computer (8) for controlling the lamp holder (73) and the motor (79) being provided between the upper cover (1) and the lower cover (5), the single-chip computer (8) being arranged on the upper side of the vertical axis (78); An annular bevel groove (713) is provided at the upper end of the arc-shaped connecting plate (71), a clamping groove (711) is provided inside the arc-shaped connecting plate (71), and the clamping groove (711) is provided at the lower end of the annular bevel groove (713); an annular plate (101) is fixed at the lower end of the upper cover (1); the outer end surface of the annular plate (101) is rotatably connected to the L-shaped rod (103); a third spring (105) is fixed between the L-shaped rod (103) and the annular plate (101); the annular plate (101) passes through the annular bevel groove (713) and extends into the clamping groove (711); and the end of the L-shaped rod (103) is clamped in the clamping groove (711); The connecting member comprises a hollow cylinder (75) fixed to the side end of the vertical shaft (78), and a conductive block (77) connected to a conductive spring (76) is arranged on the inner wall of the hollow cylinder (75).

2. A piano auxiliary practice device according to claim 1, characterized in that: A conductive rod (74) is provided inside the hollow cylinder (75). The conductive rod (74) extends from the front end of the hollow cylinder (75). The conductive rod (74) extends from the back to the front into the interior of the lamp holder (73) and is electrically connected to the lamp holder (73). The conductive rod (74) and the lamp holder (73) are detachably connected.

3. A piano auxiliary practice device according to claim 2, characterized in that: The annular outer end of the lamp holder (73) is sleeved with a shielding plate (72), the outer end surface of the shielding plate (72) is in contact with the inner wall of the arc-shaped connecting plate (71), and the upper and lower end surfaces of the shielding plate (72) are respectively in contact with the upper cover (1) and the lower cover (5).

4. A piano auxiliary practice device according to claim 3, characterized in that: The shielding plate (72) comprises a guide slider (726); a first arcuate groove is provided on the annular inner wall of the arcuate connecting plate (71); the guide slider (726) is slidably mounted inside the first arcuate groove; the inner wall of the guide slider (726) fixes the arcuate round rod (723) via a connecting rod (725); the left and right positions of the arcuate round rod (723) are both fitted with an arcuate dust shield plate (721); a compression spring (724) is provided between the two arcuate dust shield plates (721) and the connecting rod (725); the two compression springs (724) are both fitted on the arcuate round rod (723); the two arcuate dust shield plates (721) are spliced ​​together and the lamp holder (73) is clamped between the two arcuate dust shield plates (721); a limiting plate (732) is fixed to the annular outer end of the lamp holder (73); the front end surface of the limiting plate (732) fits the two arcuate dust shield plates (721).

5. A piano auxiliary practice device according to claim 1, characterized in that: A circular through groove (712) is formed at the outer end of the arc-shaped connecting plate (71), and the circular through groove (712) is connected to the third spring (105).

6. A piano auxiliary practice device according to claim 5, characterized in that: The upper end of the upper cover (1) is fixed with a device switch (3), the lower end of the lower cover (5) is provided with a power connection port (6), and the single-chip computer (8) is electrically connected to the wide-angle camera (2), the device switch (3), the Bluetooth serial port device connection port (4), the power connection port (6), the conductive rod (74), and the motor (79), respectively.

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