Scale indicating device for vocal music practice

Abstract

The invention discloses a musical scale indicating device for vocal music practice, and relates to the technical field of musical scale indicating devices.The musical scale indicating device comprises a base and an integrated circuit module arranged on the base, the integrated circuit module comprises a microphone, and the integrated circuit module further comprises a frequency-voltage conversion chip electrically connected with the microphone; the frequency-voltage conversion chip is electrically connected with a fixed resistor and an electromagnetic coil, the base is provided with a sound book mechanism for writing musical scale frequency change into a continuous curve, the sound book mechanism comprises a side position seat and a U-shaped clamping frame which are fixedly connected to the base, a transverse moving seat for fixing and supporting the electromagnetic coil is arranged between the side position seat and the U-shaped clamping frame, and the transverse moving seat is connected with the electromagnetic coil. The U-shaped clamping frame is provided with a shifting assembly for driving the transverse shifting seat to do reciprocating motion in the horizontal transverse direction; according to the invention, the musical scale change can be concrete into a continuous curve through the arrangement of the musical scale book mechanism, so that the pitch change condition of the musical scale can be visually displayed, and the comparison and analysis in the teaching and practice process are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of scale indicating devices, and particularly to a scale indicating device for vocal music practice. Background Art

[0002] In the field of vocal music teaching and practice, the grasp of intonation is one of the important problems that vocal music learners must overcome. Intonation is not only related to the beauty and expressiveness of singing, but also a key indicator to measure the singing level. A scale refers to a set of notes arranged in a certain order and is one of the most basic elements in music.

[0003] Pitch is the subjective perception of the height of a sound by the human ear, which is mainly determined by the frequency of the sound. The higher the frequency, the higher the pitch; the lower the frequency, the lower the pitch. A scale is the basic organizational form of pitch relationships in music, and the pitch differences in a scale are reflected by different pitches. In vocal music practice, the accurate singing of a scale is the foundation, but most of the existing vocal music practice devices are difficult to visually present the changes in the scale during the practice process, that is, it is difficult to directly show the pitch changes of the scale during singing.

[0004] Therefore, during vocal music teaching and practice, it is difficult to effectively compare the practice effects of different people, and it is also difficult to visually present the progress of the same person during multiple practice processes. This makes it difficult for teachers to accurately evaluate the learning progress of students, and it is also difficult for students to timely discover and correct the scale errors during the practice process, thus affecting the efficiency and effect of vocal music practice. Therefore, a scale indicating device for vocal music practice is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a scale indicating device for vocal music practice, which has the advantages of visually presenting the pitch changes of the scale and facilitating comparison and analysis during the teaching and practice processes, and solves the problem of being difficult to visually present the changes in the scale during the practice process.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A scale indicating device for vocal music practice, including a base and an integrated circuit module arranged thereon. The integrated circuit module includes a microphone, and the integrated circuit module further includes a frequency-voltage conversion chip electrically connected to the microphone. The frequency-voltage conversion chip is electrically connected to a fixed resistor and an electromagnetic coil. The base is provided with a sound writing mechanism for writing the scale frequency changes as a continuous curve;

[0007] The sound writing mechanism includes a side position seat and a U-shaped clamping frame fixedly connected to the base. A horizontal moving seat for fixedly supporting the electromagnetic coil is arranged between the side position seat and the U-shaped clamping frame. The U-shaped clamping frame is provided with a displacement changing component for driving the horizontal moving seat to reciprocate horizontally;

[0008] A guiding column slidably penetrates through the transverse moving seat. A metal ring that is magnetically attracted to the electromagnetic coil is fixedly sleeved on the guiding column. A return spring is sleeved on the outer peripheral surface of the guiding column, and the two ends of the return spring are respectively fixedly connected to the transverse moving seat and the metal ring;

[0009] Above the base, there is a middle position seat. The horizontal transverse sides of the middle position seat include integrally formed side convex parts, and longitudinal position components for restricting the relative movement of the middle position seat on the base are provided on the side convex parts.

[0010] Preferably, the variable displacement component includes a threaded rod slidably penetrating through the side position seat and the U-shaped clamping frame. A threaded barrel is threadedly connected to the threaded rod, and the threaded barrel is fixedly connected to the transverse moving seat;

[0011] A spline shaft is fixedly connected to the side position seat. One end of the spline shaft away from the side position seat is fixedly connected to the U-shaped clamping frame. A spline barrel is slidably sleeved on the spline shaft, and a fixed connection is established between the spline barrel and the transverse moving seat;

[0012] On the U-shaped clamping frame, there is a direction-changing component for adjusting the rotation direction of the threaded rod when the transverse moving seat is at the terminal position of the horizontal stroke.

[0013] Preferably, the direction-changing component includes a driving bevel gear that is freely rotatable in the vertical direction driven by a motor. The driving bevel gear is fixedly rotated on the U-shaped clamping frame. The driving bevel gear is meshed with two sets of driven bevel gears arranged oppositely and rotating in opposite directions. Both sets of driven bevel gears are fixedly rotated on the secondary one-way serrated ring;

[0014] Both sets of the driven bevel gears are provided with round holes for the threaded rod to slidably penetrate through, and on the opposite surfaces of both sets of the driven bevel gears, secondary one-way serrated rings are coaxially and fixedly connected;

[0015] A primary bidirectional serrated ring is fixedly sleeved on the threaded rod. The primary bidirectional serrated ring is located between the two sets of secondary one-way serrated rings, and a meshing connection is established between the primary bidirectional serrated ring and the secondary one-way serrated ring.

[0016] Preferably, the direction-changing component further includes two sets of limiting rings fixedly sleeved on the spline shaft, and on the opposite surfaces of the two sets of limiting rings, a set of pressing springs are respectively fixedly connected. Both sets of pressing springs are sleeved on the spline shaft;

[0017] An axial barrel is fixedly sleeved on the threaded rod. A column cavity for the axial barrel to slide is opened on the side position seat. The axial barrel includes two integrally formed concave conical parts;

[0018] The side position seat is provided with bullet-shaped columns corresponding to the two sets of concave conical parts and is opened with receiving grooves for the bullet-shaped columns to slidably connect. A positioning spring is arranged in the receiving groove, and the two ends of the positioning spring are respectively fixedly connected to the bullet-shaped column and the side position seat.

[0019] Preferably, in the initial state, the main - level bidirectional serrated ring is meshed with a set of secondary unidirectional serrated rings, and the warhead column is located in a set of concave conical parts.

[0020] Preferably, the warhead column is in sliding contact with the outer peripheral surface of the axial cylinder.

[0021] Preferably, the guiding column slidably penetrates through the transverse moving seat and is fixedly connected with a hollow cylinder. A plurality of arc - shaped pressing plates are rotatably fixed on the inner wall of the hollow cylinder, and the plurality of arc - shaped pressing plates are arranged in a circular array.

[0022] Preferably, the longitudinal position component includes two same - direction pins fixedly connected to the end of the threaded rod and corresponding to two side convex parts one by one. A V - shaped continuous groove for the sliding connection of the same - direction pins is formed on the side convex part;

[0023] A rectangular groove for the horizontal and longitudinal sliding connection of the middle - position seat is formed on the base.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. By setting up the sound - book mechanism, the present invention can visualize the scale change as a continuous curve, thereby intuitively showing the pitch change of the scale, facilitating comparison and analysis in the teaching and practice processes, improving the efficiency of vocal music practice, reducing the waste of practice time caused by pitch problems, and enhancing the pertinence and effectiveness of teaching at the same time.

[0026] 2. Through the cooperation of the variable - shift component and the longitudinal - position component, the present invention realizes the dynamic recording of the marker pen on the paper, presenting the scale change in a fluctuating "bow" shape, with the record being complete and continuous, providing a dynamic scale - change record for vocal music practice, and facilitating the review and analysis of the practice process by trainees and teachers. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 is a schematic diagram of the component where the side - position seat is located in the present invention;

[0029] Figure 3 is the present invention Figure 1 the enlarged view at A in;

[0030] Figure 4 is a schematic diagram of the component where the axial cylinder is located in the present invention;

[0031] Figure 5 is the present invention Figure 4 the enlarged view at B in;

[0032] Figure 6 is a schematic diagram of the component where the transverse moving seat is located in the present invention;

[0033] Figure 7 Schematic diagram of the component where the main two-way serrated ring of the present invention is located;

[0034] Figure 8 Schematic diagram of the positions of two sets of secondary one-way serrated rings in the present invention.

[0035] In the figure: 1, base; 2, middle seat; 201, side convex part; 3, side seat; 4, U-shaped clamping frame; 5, threaded rod; 6, axial cylinder; 601, concave cone part; 7, positioning spring; 8, bullet head column; 9, receiving groove; 10, same-direction pin; 11, V-shaped continuous groove; 12, driving bevel gear; 13, driven bevel gear; 14, secondary one-way serrated ring; 15, main two-way serrated ring; 16, transverse movement seat; 17, threaded barrel; 18, spline shaft; 19, spline barrel; 20, electromagnetic coil; 21, guiding column; 22, metal ring; 23, return spring; 24, hollow cylinder; 25, arc-shaped pressing plate; 26, limiting ring; 27, pressing spring. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to Figures 1 to 8 , the present invention provides a technical solution: a scale indicating device for vocal music practice, including a base 1 and an integrated circuit module arranged thereon. The integrated circuit module includes a microphone, and the integrated circuit module further includes a frequency-voltage conversion chip electrically connected to the microphone. The frequency-voltage conversion chip is electrically connected to a fixed resistor and an electromagnetic coil 20. The base 1 is provided with a sound writing mechanism for writing the scale frequency change as a continuous curve;

[0038] The sound writing mechanism includes a side seat 3 and a U-shaped clamping frame 4 fixedly connected to the base 1. A transverse movement seat 16 for fixedly supporting the electromagnetic coil 20 is arranged between the side seat 3 and the U-shaped clamping frame 4. The U-shaped clamping frame 4 is provided with a variable movement component for driving the transverse movement seat 16 to reciprocate horizontally;

[0039] The guiding column 21 slidably penetrates through the transverse movement seat 16. A metal ring 22 magnetically attracted to the electromagnetic coil 20 is fixedly sleeved on the guiding column 21. A return spring 23 is sleeved on the outer peripheral surface of the guiding column 21. The two ends of the return spring 23 are respectively fixedly connected to the transverse movement seat 16 and the metal ring 22;

[0040] The horizontal lateral sides of the middle seat 2 include integrally formed side convex parts 201. A rectangular groove for the middle seat 2 to be slidably connected in the horizontal longitudinal direction is provided on the base 1. A longitudinal position component for restricting the relative movement of the middle seat 2 on the base 1 is provided on the side convex parts 201.

[0041] As Figure 1 , Figure 2 and Figure 6 shown, when a trainee plays or sings facing the microphone, the frequency-voltage conversion chip can convert the input frequency signal into a voltage signal proportional to the frequency. Then, after the sound signal collected by the microphone is amplified and filtered, it is input to the input end of the frequency-voltage conversion chip, and a voltage proportional to the sound frequency will be generated at its output end.

[0042] At the same time, the voltage signal output by the frequency-voltage conversion chip passes through a fixed resistor with a known resistance value. According to Ohm's law, a current proportional to the pitch height (frequency) can be obtained, and then the current value in the circuit where the electromagnetic coil 20 is located can change with the scale change during the performance or singing process.

[0043] Among them, a guide post 21 is provided on one side of the electromagnetic coil 20, and a metal ring 22 is fixedly arranged on the guide post 21. Then, when the current value in the circuit where the electromagnetic coil 20 is located increases, the metal ring 22 and the guide post 21 can be magnetically driven to move in the horizontal longitudinal direction. A marker pen for writing can be provided at the end of the guide post 21, and at the same time, the transverse movement seat 16 is driven to move in the horizontal transverse direction through the displacement component. Then, when the horizontal transverse position of the transverse movement seat 16 changes, the marker pen can be driven to move in the horizontal longitudinal direction through the scale change. Among them, the paper for writing is clamped and fixed to the middle seat 2 through an external fixing member. Then, during the performance or singing, the marker pen can be driven to write a continuous curve on the paper, so as to more vividly present the scale conversion and more intuitively display the pitch change of the scale.

[0044] At the same time, through the longitudinal position component provided on the side convex part 201, when the transverse movement seat 16 drives the marker pen to move to one side terminal position in the horizontal transverse direction, the horizontal longitudinal position of the paper on it can be changed through the middle seat 2. After the horizontal longitudinal position of the middle seat 2 changes, the transverse movement seat 16 can move in the reverse direction, so that the scale change during the performance is presented in a wavy "bow" shape on the paper.

[0045] It should be noted that during the actual use process, when this indicating device is used in the teaching stage, the two groups of "bow" shaped graphics generated when the trainee and the teacher play the same piece can be compared to more intuitively show the differences during the performance, and then it is convenient to find the problems existing in the learning process.

[0046] In one relatively preferred embodiment, the shifting component includes a threaded rod 5 that slidably penetrates through the side seat 3 and the U-shaped clamping frame 4. A threaded barrel 17 is threadedly connected to the threaded rod 5, and the threaded barrel 17 is fixedly connected to the transverse movement seat 16;

[0047] A spline shaft 18 is fixedly connected to the side seat 3. One end of the spline shaft 18 away from the side seat 3 is fixedly connected to the U-shaped clamping frame 4. A spline barrel 19 is slidably sleeved on the spline shaft 18, and the spline barrel 19 and the transverse movement seat 16 are fixedly connected to each other;

[0048] The U-shaped clamping frame 4 is provided with a direction-changing component for adjusting the rotation direction of the threaded rod 5 when the transverse movement seat 16 is at the terminal position of the horizontal stroke.

[0049] As Figure 1 、 Figure 2 and Figure 6 shown, when the threaded rod 5 rotates freely in the vertical direction, since the threaded barrel 17 is fixedly arranged on the transverse movement seat 16, and the spline barrel 19 fixedly arranged on the transverse movement seat 16 is slidably sleeved on the spline shaft 18, and both ends of the spline shaft 18 are respectively fixedly connected to the side seat 3 and the U-shaped clamping frame 4, therefore, under the restriction of the spline shaft 18, the transverse movement seat 16 and the threaded barrel 17 can be restricted, that is, restricting the two from following the threaded rod 5 to rotate. Therefore, when the threaded rod 5 rotates, the horizontal transverse position of the transverse movement seat 16 and the spline barrel 19 can be changed through the threaded barrel 17.

[0050] Meanwhile, driven by the direction-changing component, the rotation direction of the threaded rod 5 can be changed when the transverse movement seat 16 is at the terminal position of one side stroke, and then the threaded rod 5 is driven to rotate in the reverse direction, so as to drive the transverse movement seat 16 to reciprocate in the horizontal direction.

[0051] Based on the embodiment of the shifting component, the direction-changing component includes a driving bevel gear 12 that is driven by a motor to rotate freely in the vertical direction. The driving bevel gear 12 is rotationally fixed on the U-shaped clamping frame 4. The driving bevel gear 12 is meshed with two groups of driven bevel gears 13 that are arranged oppositely and rotate in opposite directions. Both groups of driven bevel gears 13 are rotationally fixed on the secondary one-way serrated ring 14;

[0052] Both groups of the driven bevel gears 13 are provided with circular holes for the threaded rod 5 to slidably penetrate through, and coaxial secondary one-way serrated rings 14 are fixedly connected to the opposite surfaces of both groups of the driven bevel gears 13;

[0053] A primary bidirectional serrated ring 15 is fixedly sleeved on the threaded rod 5. The primary bidirectional serrated ring 15 is located between the two groups of secondary one-way serrated rings 14, and the primary bidirectional serrated ring 15 is meshed with the secondary one-way serrated ring 14.

[0054] The direction-changing assembly further includes two sets of limit rings 26 fixedly sleeved on the spline shaft 18, and the opposite surfaces of the two sets of limit rings 26 are respectively fixedly connected with a set of pressure springs 27, and the two sets of pressure springs 27 are both sleeved on the spline shaft 18;

[0055] The threaded rod 5 is fixedly sleeved with an axial tube 6, and the edge seat 3 is provided with a column cavity for the axial tube 6 to slide, and the axial tube 6 includes two sets of concave cones 601 formed in one piece;

[0056] The edge seat 3 is provided with a bullet column 8 at the position corresponding to the two groups of concave cones 601 and is provided with a receiving groove 9 for sliding connection of the bullet column 8. A positioning spring 7 is provided in the receiving groove 9, and the two ends of the positioning spring 7 are fixedly connected to the bullet column 8 and the edge seat 3 respectively.

[0057] In the initial state, the primary bidirectional serrated ring 15 is meshedly connected with a group of secondary unidirectional serrated rings 14, and the bullet column 8 is located in a group of concave cones 601, and the bullet column 8 is in sliding contact with the outer peripheral surface of the axial tube 6.

[0058] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the driving bevel gear 12 connected to the motor output shaft by the motor fixed on the U-shaped clamp frame 4 rotates freely in the vertical direction, and then the two sets of driven bevel gears 13 meshing therewith are driven to rotate synchronously through the rotation process of the driving bevel gear 12. Since the two sets of driven bevel gears 13 are arranged relatively, the two sets of driven bevel gears 13 and the secondary one-way serrated ring 14 coaxially fixed thereon rotate in opposite directions.

[0059] At the same time, a primary bidirectional serrated ring 15 is fixedly provided on the threaded rod 5. Therefore, by driving the threaded rod 5 to slide on the U-shaped clamp frame 4, the primary bidirectional serrated ring 15 is driven to engage with one group of secondary unidirectional serrated rings 14, so that the primary bidirectional serrated ring 15 and the threaded rod 5 are driven to rotate through the group of secondary unidirectional serrated rings 14, and the two groups of secondary unidirectional serrated rings 14 have different directions of rotation, so that the primary bidirectional serrated ring 15 is driven to alternately engage with the two groups of secondary unidirectional serrated rings 14, so as to achieve the purpose of alternately changing the rotation of the threaded rod 5, thereby driving the threaded cylinder 17 threadedly connected to the threaded rod 5 and the transverse displacement seat 16 fixedly connected to the threaded cylinder 17 to reciprocate in the horizontal direction.

[0060] Wherein, when the transverse seat 16 drives the spline barrel 19 fixedly arranged below it to move along the laying direction of the spline shaft 18, the horizontal distance between the spline barrel 19 and a set of limit rings 26 can be gradually reduced. Then, when the spline barrel 19 abuts against and squeezes the compression spring 27 fixedly arranged on the set of limit rings 26, the compression spring 27 can be driven to undergo a compressive deformation. At this time, the elastic deformation of the compression spring 27 will exert a thrust on the spline barrel 19. Under the action of this thrust, the transverse seat 16 and the threaded rod 5 can be driven to displace a certain distance in the horizontal direction, and the axial barrel 6 fixedly arranged between the threaded rod 5 can be driven to move in the column cavity.

[0061] Meanwhile, the outer peripheral surface of the axial barrel 6 squeezes the bullet head column 8, forcing the positioning spring 7 to undergo a compressive deformation, and driving the bullet head column 8 to retract into the receiving groove 9. When the bullet head column 8 corresponds to the adjacent concave cone portion 601, the positioning spring 7 can restore its deformation to drive the bullet head column 8 into the corresponding concave cone portion 601. At this time, under the restriction of the bullet head column 8, the axial barrel 6 and the threaded rod 5 are further prevented from moving arbitrarily in the horizontal direction.

[0062] At the same time, during this process, when the bullet head column 8 moves horizontally under the action of the thrust, it can drive the main - stage bidirectional saw - tooth ring 15 arranged thereon to move synchronously, thereby changing the meshing relationship between the main - stage bidirectional saw - tooth ring 15 and the two sets of secondary unidirectional saw - tooth rings 14, making the main - stage bidirectional saw - tooth ring 15 mesh with the other set of secondary unidirectional saw - tooth rings 14. Since the two sets of secondary unidirectional saw - tooth rings 14 rotate in opposite directions, the rotation of the threaded rod 5 can be changed, and further the moving direction of the threaded barrel 17, the transverse seat 16, and the spline barrel 19 in the horizontal direction can be changed. When the moving direction of the transverse seat 16 changes, it can gradually move away from the limit ring 26 that was previously approached, and drive the compression spring 27 arranged thereon to gradually restore its elastic potential energy.

[0063] Furthermore, as the transverse seat 16 continues to move subsequently, it can squeeze the compression spring 27 on the other set of limit rings 26, so that under the push of this set of compression springs 27, the horizontal position of the threaded rod 5 is changed again, thereby achieving the purpose of changing the moving direction of the transverse seat 16 again. Therefore, when the driving bevel gear 12 rotates in a constant direction under the drive of the motor, the transverse seat 16 and its components can be driven to move reciprocally in the horizontal direction.

[0064] Based on the embodiment of the direction - changing assembly, the guide post 21 slidably penetrates through the transverse seat 16 and is fixedly connected with a hollow cylinder 24. A plurality of arc - shaped pressing plates 25 are rotatably fixed on the inner wall of the hollow cylinder 24, and the plurality of arc - shaped pressing plates 25 are arranged in an annular array.

[0065] Such as Figure 1 、 Figure 2 and Figure 6As shown, during actual use, the marker pen is inserted into the channel formed by multiple groups of arc-shaped pressing plates 25, and the tip of the pen can contact the paper. At the same time, a torsion spring for driving the arc-shaped pressing plates 25 to return to the initial deflection state is provided on the hollow cylinder 24. This torsion spring is an existing device and a well-known technical means in the art, so it is not shown in the figure. Therefore, when the marker pen is inserted into this channel, the ends of multiple groups of arc-shaped pressing plates 25 are in pressing contact with the marker pen, thereby ensuring the stability of the marker pen to ensure that it can move synchronously with the hollow cylinder 24, and the tip of the pen always contacts the paper when the horizontal position changes.

[0066] Further, the longitudinal position assembly includes two groups of same-direction pins 10 fixedly connected to the end of the threaded rod 5 and corresponding to the two groups of side convex parts 201 one by one. A V-shaped continuous groove 11 for the sliding connection of the same-direction pins 10 is formed on the side convex part 201.

[0067] As Figure 1 、 Figure 2 and Figure 4 shown, when the cross-moving seat 16 reaches the end of the stroke and moves in the horizontal direction under the drive of the pressing spring 27, it can drive the same-direction pins 10 fixedly arranged at its end to move synchronously. Among them, the same-direction pins 10 are slidably connected to the side convex part 201 through the V-shaped continuous groove 11. Furthermore, when the cross-moving seat 16 is in the terminal position and then changes the moving direction, it can drive the middle seat 2 and the paper thereon to move in the horizontal longitudinal direction, so as to drive the marker pen to draw in another row, thereby improving the utilization space of the paper while ensuring the continuity and integrity of the curve.

[0068] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A scale indicating device for vocal practice, comprising a base (1) and an integrated circuit module arranged thereon, the integrated circuit module comprising a microphone, characterized in that: The integrated circuit module also includes a frequency-voltage conversion chip electrically connected to the microphone, the frequency-voltage conversion chip is electrically connected to a fixed resistor and an electromagnetic coil (20), and the base (1) is provided with a sound book mechanism for writing the frequency change of the musical scale as a continuous curve; The audio book mechanism comprises a side seat (3) and a U-shaped clamp frame (4) on a fixed connection base (1); a transverse seat (16) for fixing and supporting an electromagnetic coil (20) is provided between the side seat (3) and the U-shaped clamp frame (4); and a shifting assembly for driving the transverse seat (16) to reciprocate in a horizontal direction is provided on the U-shaped clamp frame (4); A guide column (21) is slidably penetrated on the transverse seat (16), a metal ring (22) which is magnetically attracted to the electromagnetic coil (20) is fixedly sleeved on the guide column (21), and a return spring (23) is sleeved on the outer peripheral surface of the guide column (21), and two ends of the return spring (23) are respectively fixedly connected to the transverse seat (16) and the metal ring (22); A middle seat (2) is arranged above the base (1), and the two horizontal lateral sides of the middle seat (2) include integrally formed side convex parts (201), and the side convex parts (201) are provided with longitudinal components for limiting and driving the relative movement of the middle seat (2) on the base (1).

2. A scale indicating device for vocal practice according to claim 1, characterized in that: The shifting assembly comprises a threaded rod (5) which slides through the edge seat (3) and the U-shaped clamp frame (4); a threaded cylinder (17) is threadedly connected to the threaded rod (5), and the threaded cylinder (17) is fixedly connected to the transverse shifting seat (16); The edge seat (3) is fixedly connected with a spline shaft (18), one end of the spline shaft (18) away from the edge seat (3) is fixedly connected to the U-shaped clamp frame (4), a spline cylinder (19) is slidably sleeved on the spline shaft (18), and the spline cylinder (19) and the transverse seat (16) are fixedly connected; The U-shaped clamp frame (4) is provided with a direction-changing component for adjusting the rotation direction of the threaded rod (5) when the transverse displacement seat (16) is at the terminal position of the horizontal stroke.

3. A scale indicating device for vocal practice according to claim 2, characterized in that: The direction-changing assembly comprises a driving bevel gear (12) driven by a motor and freely rotating in a vertical direction, the driving bevel gear (12) rotating on a fixed axis on a U-shaped clamp frame (4), the driving bevel gear (12) being meshedly connected with two sets of driven bevel gears (13) arranged in opposite directions, the two sets of driven bevel gears (13) both rotating on a fixed axis on a secondary one-way sawtooth ring (14); The two sets of driven bevel gears (13) are both provided with circular holes for the threaded rods (5) to slide through, and the opposite surfaces of the two sets of driven bevel gears (13) are both coaxially fixedly connected with secondary one-way sawtooth rings (14); A primary bidirectional sawtooth ring (15) is fixedly sleeved on the threaded rod (5), the primary bidirectional sawtooth ring (15) is located between two sets of secondary unidirectional sawtooth rings (14), and the primary bidirectional sawtooth ring (15) is meshedly connected with the secondary unidirectional sawtooth ring (14).

4. A scale indicating device for vocal practice according to claim 3, characterized in that: The direction-changing assembly further comprises two groups of limiting rings (26) fixedly sleeved on the spline shaft (18), and opposite surfaces of the two groups of limiting rings (26) are respectively fixedly connected with a group of pressure springs (27), and the two groups of pressure springs (27) are both sleeved on the spline shaft (18); An axial tube (6) is fixedly sleeved on the threaded rod (5), a column cavity for the axial tube (6) to slide is opened on the edge seat (3), and the axial tube (6) includes two sets of concave cones (601) formed in one piece; The edge seat (3) is provided with a bullet column (8) at the position corresponding to the two groups of concave cones (601) and is provided with a receiving groove (9) for the bullet column (8) to be slidably connected. A positioning spring (7) is provided in the receiving groove (9). The two ends of the positioning spring (7) are respectively fixedly connected to the bullet column (8) and the edge seat (3).

5. A scale indicating device for vocal practice according to claim 4, characterized in that: In the initial state, the primary bidirectional sawtooth ring (15) is meshedly connected with a group of secondary unidirectional sawtooth rings (14), and the bullet column (8) is located in a group of concave cones (601).

6. A scale indicating device for vocal music practice according to claim 5, characterized in that: The bullet column (8) is in sliding contact with the outer peripheral surface of the axial tube (6).

7. A scale indicating device for vocal practice according to claim 1, characterized in that: The guide column (21) slides through the transverse displacement seat (16) and is fixedly connected to a hollow cylinder (24). The inner wall of the hollow cylinder (24) is provided with a plurality of groups of arc-shaped pressure plates (25) which rotate along a fixed axis. The plurality of groups of arc-shaped pressure plates (25) are arranged in a ring array.

8. A scale indicating device for vocal practice according to claim 2, characterized in that: The longitudinal assembly comprises two groups of unidirectional pins (10) fixedly connected to the ends of the threaded rod (5) and corresponding one to one with the two groups of edge protrusions (201); the edge protrusions (201) are provided with V-shaped continuous grooves (11) for the unidirectional pins (10) to be slidably connected; The base (1) is provided with a rectangular groove for the middle seat (2) to be slidably connected in the horizontal and longitudinal directions.

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