Erhu bow trajectory pressure auxiliary training device

Abstract

The application discloses a two-stringed Chinese violin bow trajectory pressure auxiliary training device, which comprises a base, a guiding structure of the base is used for guiding a bow hair, a supported part is connected with the base and is used for supporting the base, and the supported part is provided with an adsorption structure which is used for being adsorbed to a sound post through negative pressure.

Description

Technical Field

[0001] This invention relates to the field of musical instrument technology, and in particular to a pressure-assisted training device for the bowing trajectory of the erhu. Background Technology

[0002] The erhu has a mellow and beautiful tone, which is very expressive and can be described as plaintive. The body of the erhu is made up of a soundbox, neck, tuning pegs and snakeskin. It produces sound by rubbing a horsehair bow between the two strings. The erhu can play both deep and sad melodies and joyful and lively scenes. It is an important instrument in solo, ensemble and opera accompaniment.

[0003] Although the erhu is loved by many, it is difficult to learn. It requires a steady bow stroke and the bow trajectory must be kept in a straight line along the soundbox. Therefore, some beginners use bow trajectory assistive training devices to help them practice. However, the existing erhu bow trajectory pressure assistive training devices are rather crude in their installation and removal methods. They are usually fixed to the erhu with tape or double-sided tape, which makes it easy to damage the erhu when removing the bow trajectory assistive training device. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide an erhu bowing trajectory pressure-assisted training device, which reduces the degree of damage to the erhu during the process of removing it from the erhu.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A pressure-assisted training device for erhu bowing trajectory includes: a base and a supported component;

[0007] The base has a guide structure for guiding the bow hair;

[0008] The supported component is connected to the base and is used to support the base; the supported component has an adsorption structure, which is used to adsorb onto the instrument cylinder by negative pressure.

[0009] Furthermore, the adsorption structure is a suction cup; the suction cup vents air through its own elasticity to adsorb onto the instrument body; the supported member is provided with an air intake channel; the supported member is connected to an on / off valve, which can open or close the air intake channel; the air intake channel and the suction cup are connected sequentially along the air intake direction.

[0010] Furthermore, the supported member is provided with a rotating mating surface and an air inlet; the air inlet, the air inlet channel, and the suction cup are connected in sequence along the air inlet direction; the opening and closing valve has an air inlet, and the opening and closing valve is rotatably mated with the rotating mating surface so that the air inlet can be connected to or isolated from the air inlet.

[0011] Furthermore, the side wall of the supported member with the air inlet is a first fitting wall, and the side wall of the valve with the air inlet is a second fitting wall, and the first fitting wall and the second fitting wall are slidably and sealingly connected.

[0012] Furthermore, the opening and closing valve is sleeved outside the rotating mating surface, and the outer wall of the supported member is provided with a positioning mark, which points to the air inlet.

[0013] Furthermore, the supported member is provided with a plurality of suction cups, and the plurality of suction cups are all connected to the same air intake channel.

[0014] Furthermore, the supported member is provided in multiple parts, and the multiple supported members are connected to opposite sides of the base.

[0015] Furthermore, the supported component includes a bendable sleeve and a rigid pipe, the bendable sleeve being fitted around the rigid pipe and connected to the base; the air intake channel is located on the rigid pipe, and the on / off valve is connected to the rigid pipe.

[0016] Furthermore, the bendable sleeve is a component made of an elastic material.

[0017] Furthermore, the guide structure is provided with a limiting through hole for the bow hair to pass through; the base also has an opening and closing door, the hinged end of which is hinged to the guide structure so that the swing end of the opening and closing door can swing relative to the guide structure to open or close the limiting through hole; one of the swing end of the opening and closing door and the guide structure is provided with a magnet, and the other is provided with a magnetic element, the magnet being used to hold the magnetic element.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. The base has a guide structure, which guides the bow hair. The guide structure provides an intuitive trajectory for the linear movement of the bow hair, allowing the user to observe whether the bow hair is moving along the preset ideal trajectory at all times during bowing. This avoids common problems for beginners, such as bending or tilting of the bowing trajectory, and allows beginners to quickly establish correct planar bowing muscle memory.

[0020] 2. Based on the connection between the supported component and the base, and used to support the base; the supported component has an adsorption structure, which is used to adsorb onto the soundbox through negative pressure. Compared with the traditional clamping and fixing method, the method of fixing the supported component to the soundbox of the erhu through the negative pressure adsorption structure does not require applying clamping force to the erhu that may cause deformation during the installation and fixing process, thus avoiding physical damage or scratches to the erhu body; and the traditional fixing method using tape or double-sided tape will leave adhesive marks on the soundbox during the process of removing the supported component from the erhu, thus causing damage to the soundbox; while the adsorption structure of the negative pressure adsorption structure can directly detach from the soundbox after balancing the air pressure during the process of removing the supported component from the erhu, without leaving adhesive marks, thus reducing the degree of damage to the soundbox.

[0021] 3. Based on the connection between the supported component and the base, and used to support the base; the supported component has an adsorption structure, which is used to adsorb onto the body of the instrument through negative pressure. The adsorption structure can adapt to the surface of the body of the instrument of different shapes, and has strong versatility; and once the adsorption structure adsorbs and forms negative pressure, the connection is stable and can effectively resist the force and vibration generated during bowing, thereby ensuring that the base and guide structure will not be displaced or shaken, and ensuring the stability and reliability of the user's training process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the working of an erhu bowing trajectory pressure-assisted training device according to the present invention;

[0023] Figure 2 for Figure 1 The diagram shown is a structural schematic of a pressure-assisted training device for erhu bowing trajectory.

[0024] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0025] Figure 4 for Figure 2 A sectional view;

[0026] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

[0027] Figure 6 for Figure 3 A diagram showing the separation of the inlet / outlet valve and the intake passage.

[0028] In the diagram: 1. Base; 101. Guide structure; 102. Opening and closing door; 2. Supported component; 201. Adsorption structure; 202. Bendable sleeve; 203. Rigid pipe; 3. Air intake channel; 4. Opening and closing valve; 5. Rotating mating surface; 6. Air inlet; 7. Air inlet port; 8. First mating wall; 9. Second mating wall; 10. Positioning mark; 11. Limiting through hole; 12. String; 13. Bow hair. Detailed Implementation

[0029] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] It should be noted that when an element is described as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is described as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] See Figures 1-6 A preferred embodiment of the present invention provides an erhu bowing trajectory pressure-assisted training device, comprising: a base 1 and a supported member 2;

[0033] The base 1 has a guide structure 101, which guides the bow hair 13. The bow hair 13 is the part that produces sound by rubbing against the strings 12 during erhu playing. The guide structure 101 provides an intuitive trajectory for the linear movement of the bow hair 13, allowing the user to observe whether the bow hair 13 is moving along the preset ideal trajectory during bowing. This avoids common problems for beginners, such as bent or tilted bowing trajectories, and helps beginners quickly establish correct planar bowing muscle memory. The guide structure 101 can be a groove, a limiting through hole 11, a roller assembly, or multiple laser lights forming a guide light path for guidance. As a supplementary solution, a rotating mechanism or pivot shaft can be provided between the guide structure 101 and the base 1 to rotate the guide structure 101. A locking mechanism can then be added to lock the rotation angle of the guide structure 101, thereby allowing the guide structure 101 to pre-adjust the bowing trajectory of the bow hair 13 and facilitating bowing practice for people with different left and right-handed preferences. The base 1 can also be equipped with a slide rail and a slider, with the guide structure 101 mounted on the slider. This configuration allows the guide structure 101 to be moved by sliding the slider after the base 1 is fixedly installed on the erhu if the installation position of the base 1 deviates from the intended position, preventing the bow hair 13 from being placed in the guide structure 101. This compensates for the positional deviation and allows the bow hair 13 to be successfully placed in the guide structure 101, facilitating erhu bowing trajectory training for users. A locking mechanism such as a set screw can also be added to the slider to lock the movement of the slider.

[0034] The supported member 2 is connected to the base 1 and is used to support the base 1; the supported member 2 has an adsorption structure 201, which is used to adsorb onto the instrument cylinder by negative pressure. Compared to traditional clamping and fixing methods, the negative pressure adsorption structure 201, which fixes the support member 2 to the erhu's soundbox, eliminates the need for clamping forces that could deform the erhu during installation, thus avoiding physical damage or scratches to the erhu body. Traditional fixing methods using adhesive tape or double-sided tape leave adhesive residue on the soundbox during removal, causing damage. However, the negative pressure adsorption structure 201 detaches directly from the soundbox after balancing the air pressure, leaving no adhesive residue and reducing damage. The adsorption structure 201 is adaptable to different soundbox shapes, offering high versatility. Furthermore, once negative pressure is created, the connection is stable, effectively resisting the forces and vibrations generated during bowing, ensuring that the base 1 and guide structure 101 do not shift or wobble, guaranteeing stability and reliability during user training. The adsorption structure 201 can be a passive elastic suction cup, which is simple in structure, requires no additional operating mechanism, has high reliability, and the flexible lip can adapt to the surface of the instrument body with different curvatures; or it can be an active suction cup, which can generate strong adsorption force, has high stability, and the adsorption state can be locked by cooperating with a valve.

[0035] During the installation of this invention, the base 1 is first placed at the position of the string 12 to be played on the erhu. Then, the support 2 is fixed to the erhu's body by negative pressure adsorption through the adsorption structure 201 on the supported member 2, thereby fixing the base 1 connected to the supported member 2 as well. Next, the bow hair 13 is placed into the guide structure 101 to complete the installation. Since one of the two strings 12 of the erhu is already located within the area surrounded by the bow and bow hair 13, after the invention is installed, the bowing trajectory of the erhu bow can be restricted, ensuring that the bow hair 13 is always in the position where it rubs against the string 12 to produce sound, thus allowing the user to begin training the erhu bowing trajectory. During the disassembly of this invention, simply balance the air pressure inside the adsorption structure 201 to match the external pressure, and the adsorption structure 201 can be detached from the body. Then, the bow hair 13 is removed from the guide structure 101, and the supported member 2 and base 1 are removed from the erhu to complete the disassembly.

[0036] The base 1 has a guide structure 101, which guides the bow hair 13. The guide structure 101 provides an intuitive trajectory for the linear movement of the bow hair 13, allowing the user to constantly observe whether the bow hair 13 moves along the preset ideal trajectory during bowing. This avoids common problems for beginners, such as bent or tilted bowing trajectories, and helps beginners quickly establish correct planar bowing muscle memory. The supported member 2 is connected to the base 1 and supports the base 1. The supported member 2 has an adsorption structure 201, which is used to adsorb onto the soundbox through negative pressure. Compared to traditional clamping and fixing methods, the negative pressure adsorption structure 201, which fixes the support member 2 to the erhu's soundbox, eliminates the need for clamping force that could deform the erhu during installation, thus avoiding physical damage or scratches to the erhu body. Traditional fixing methods using adhesive tape or double-sided tape leave adhesive residue on the soundbox during removal, potentially damaging it. In contrast, the negative pressure adsorption structure 201, after balancing the air pressure, allows the support member 2 to be removed from the erhu more easily. It detaches directly from the soundbox without leaving any adhesive residue, thus reducing the damage to the soundbox. The supported component 2 is connected to the base 1 and is used to support the base 1. The supported component 2 has an adsorption structure 201, which is used to adsorb onto the soundbox through negative pressure. The adsorption structure 201 can adapt to the surface of the soundbox of different shapes and has strong versatility. Moreover, once the adsorption structure 201 adsorbs and forms a negative pressure, the connection is stable and can effectively resist the force and vibration generated during bowing, thereby ensuring that the base 1 and the guide structure 101 will not be displaced or shaken, ensuring the stability and reliability of the user's training process.

[0037] Preferably, the adsorption structure 201 is a suction cup; the suction cup adsorbs onto the soundbox by its own elastic expulsion. This design eliminates the need for additional mechanical structures; simply applying a certain amount of force to the suction cup allows it to expel air, thus improving ease of use. The supported component 2 is provided with an air intake channel 3; the supported component 2 is connected to an on / off valve 4, which can open or close the air intake channel 3; the air intake channel 3 and the suction cup are sequentially connected along the air intake direction. Traditional suction cups rely on prying the edge of the lip to break the seal between the lip and the object being sucked for disassembly. This operation generates a strong instantaneous local pressure at the moment of disassembly, which may damage the precious surface of the soundbox. In this embodiment, the on / off valve 4 and the air intake channel 3 are configured such that the on / off valve 4 controls the opening and closing of the air intake channel 3. When the suction cup needs to be disassembled, simply opening the on / off valve 4 allows external air to flow into the suction cup to balance the air pressure, thus eliminating the adsorption force and allowing the suction cup to be lifted and removed directly without exerting additional force on the soundbox, thereby reducing the degree of damage to the surface of the erhu. The on / off valve 4 can be a mechanically operated valve, such as a rotary valve or a reed valve; or it can be an electromechanical operated valve, such as a solenoid valve or an electric valve.

[0038] Preferably, the supported component 2 is provided with a rotating mating surface 5 and an air inlet 6; the air inlet 6, the air inlet channel 3, and the suction cup are connected in sequence along the air inlet direction. This arrangement can provide a clear flow path for external gas to enter the suction cup. When the opening and closing valve 4 is opened, external air can directly flow into the suction cup cavity quickly along this path, thereby achieving instantaneous pressure relief and allowing the suction cup to be quickly released from the instrument body, thus improving disassembly efficiency; the opening and closing valve 4 has an air inlet 7, and the opening and closing valve 4 is rotatably mated with the rotating mating surface 5 so that the air inlet 7 can be connected to or isolated from the air inlet 6. The rotating mating surface 5 serves simultaneously as the mounting positioning surface and rotational guide rail for the on / off valve 4, allowing the on / off valve 4 to be directly assembled onto the supported component 2 without additional fixed brackets or complex connectors. This reduces the number of parts, manufacturing costs, and assembly complexity. The on / off valve 4 rotates around the rotating mating surface 5, and its air inlet 7 and air inlet hole 6 on the air inlet channel 3 form a simple rotary distribution valve. This structure provides two distinct opening and closing positions. When the on / off valve 4 is rotated to offset and isolate the air inlet 7 and air inlet hole 6, the air exchange channel between the air inlet channel 3 and the outside is closed, allowing the suction cup to perform negative pressure adsorption and enabling rapid installation of the supported component 2. When the on / off valve 4 is rotated to align and connect the air inlet 7 and air inlet hole 6, the outside airflow smoothly enters the suction cup along the air inlet channel 3, enabling rapid depressurization of the suction cup and allowing it to detach from the surface of the instrument body, thus completing the rapid disassembly of the supported component 2.

[0039] Preferably, the side wall of the supported member 2 with the air inlet 6 is the first fitting wall 8, and the side wall of the valve 4 with the air inlet 7 is the second fitting wall 9. The first fitting wall 8 and the second fitting wall 9 are slidably and sealingly connected. Compared to plug valves or pull valves that require a certain amount of rotation space, this planar sliding design between the opening / closing valve 4 and the supported component 2 allows the movement to occur between two parallel or nearly parallel mating walls. The direction of movement is parallel to the wall surface, eliminating the need for extra space and thus improving space utilization. Furthermore, this movement method avoids radial or axial displacement, preventing bulging of the instrument body surface caused by suction during movement and reducing damage. This design also creates a large-area surface contact seal between the first mating wall 8 and the second mating wall 9. If a planar sealing gasket is placed between the two walls, a continuous and uniform sealing ring can be formed, improving the sealing performance between the first mating wall 8 and the second mating wall 9. This effectively prevents chronic air leakage caused by local unevenness and ensures long-term stable negative pressure maintenance of the suction cup when closed.

[0040] Preferably, the on / off valve 4 is sleeved on the rotating mating surface 5. In this sleeved manner, the on / off valve 4 is directly assembled onto the protruding rotating mating surface 5 of the supported member 2 like a hat. This connection method does not require additional fasteners such as screws or clips. Reliable connection can be achieved by relying only on interference fit or simple anti-loosening flange, thereby simplifying the production and assembly process. At the same time, the sleeve structure can ensure the coaxiality between the on / off valve 4 and the air intake channel 3, making the alignment of the air intake port 7 and the air intake hole 6 more accurate and ensuring the reliability of the seal. The outer wall of the supported member 2 is provided with a positioning mark 10, which points to the air intake hole 6. Because the opening and closing valve 4 is sleeved outside the rotating mating surface 5, the air inlet 6 is covered, and the user cannot directly observe the specific position of the air inlet 6. As a result, when it is necessary to guide outside air into the air intake channel 3, the air inlet 6 and the air inlet 7 cannot be quickly aligned, and it takes time to adjust. However, by setting a positioning mark 10, which points to the air inlet 6, when it is necessary to introduce outside air into the air intake channel 3, the user only needs to rotate the opening and closing valve 4 to easily locate the specific position of the air inlet 6 through the positioning mark 10. This allows the air inlet 7 to be quickly and accurately aligned with the air inlet 6, allowing outside air to enter the air intake channel 3, thereby improving work efficiency.

[0041] Preferably, the supported component 2 is equipped with multiple suction cups, all of which are connected to the same air intake channel 3. If only a single suction cup is used, the flatness and cleanliness of the surface of the instrument body to be suctioned are crucial; dust or scratches at the suction point can cause air leakage and lead to suction failure. However, by using multiple suction cups connected in parallel through the same air intake channel 3, even if one suction cup has a poor seal on its suction surface, the remaining suction cups can still maintain sufficient overall suction force, thus improving the adaptability and reliability of the suction cups on different instrument body surfaces. Furthermore, the dispersed arrangement of multiple small-area suction cups reduces the unit area pressure on the instrument body compared to a single large suction cup, resulting in a more uniform distribution of suction force and avoiding excessive stress concentration in certain areas of the instrument body, thereby reducing the degree of damage. By connecting multiple suction cups in parallel through internal air channels, the user only needs to operate one on / off valve 4 to simultaneously control the suction and release of all suction cups, simplifying the operation process and improving work efficiency.

[0042] Preferably, multiple supported members 2 are provided, and the multiple supported members 2 are connected to opposite sides of the base 1. The multiple supported members 2 are symmetrically arranged on opposite sides of the base 1 to form a stable support structure similar to a bridge or gate. This structure can effectively resist the lateral forces and torques generated during the user's bow handling, prevent the base 1 and the guide structure 101 from shifting or rotating, and ensure that the straightness of the bow hair 13 trajectory is not affected by changes in the bow handling force, thereby improving the working reliability of this embodiment.

[0043] Preferably, the supported component 2 includes a bendable sleeve 202 and a rigid pipe 203. The bendable sleeve 202 is fitted around the rigid pipe 203 and connected to the base 1. An air intake channel 3 is located within the rigid pipe 203, and an on / off valve 4 is connected to the rigid pipe 203. This arrangement divides the support component into two parts: one providing rigid support and the other providing flexible connection. The user can flexibly adjust the relative angle and position between the base 1 and the adsorption end of the supported component 2 by bending and twisting the bendable sleeve 202. This allows the guide structure 101 on the base 1 to adapt to different erhu body shapes and the user's bow-holding habits, ensuring that the guide plane and the strings 12 are in the optimal relative position. The bendable sleeve 202, fitted around the rigid pipe 203, provides good dust protection for the rigid pipe 203. The air intake channel 3, located inside the rigid pipe 203, ensures that the airflow path is not affected by the deformation of the external bendable sleeve 202, maintaining the stability of the airflow path.

[0044] Preferably, the bendable sleeve 202 is a component made of an elastic material. Using an elastic material allows the bendable sleeve 202 to bend and retain its shape when adjustment is needed, and also allows it to return to its original shape under heat or external force during disassembly, thereby improving ease of use. The elastic material can be a material with elasticity and fatigue resistance, such as rubber, silicone, thermoplastic elastomer (TPE), or cloth composite material.

[0045] Preferably, the guide structure 101 is provided with a limiting through hole 11 for the bow hair 13 to pass through; the base 1 also has an opening and closing door 102, the hinged end of the opening and closing door 102 is hinged to the guide structure 101 so that the swing end of the opening and closing door 102 can swing relative to the guide structure 101 to open or close the limiting through hole 11; one of the swing end of the opening and closing door 102 and the guide structure 101 is provided with a magnet, and the other is provided with a magnetic element, the magnet being used to attract the magnetic element. With the opening and closing door 102 in place, the user can easily insert the bow hair 13 into the limiting through hole 11 simply by opening the door 102. Then, by pushing the swing end of the opening and closing door 102, the bow hair 13 can be closed by magnetic attraction, thus confining it within the limiting through hole 11. The whole process is very convenient. After closing, the opening and closing door 102 and the guide structure 101 together form a closed ring constraint, confining the bow hair 13 within a preset movement path, thereby providing a stable bowing trajectory, facilitating user practice and improving the efficiency of muscle memory formation. After practice, the user only needs to apply a certain amount of force to push the swing end of the opening and closing door 102 to disengage it from the magnetic closure, and the bow hair 13 can be quickly removed from the limiting through hole 11, thus improving ease of use. Furthermore, the setting of the limiting through hole 11 ensures that the bow hair 13 is always in a position where it can rub against the strings 12 to produce sound, thus facilitating the user's playing practice. The use of magnets and magnetic elements for attraction achieves closure and fixation; it automatically attracts when closed, eliminating the need for forceful pressing or alignment of latches, resulting in high operational efficiency. Opening requires only a small peeling force, avoiding accidental damage to the bow hair 13 that might occur with mechanical latches. Moreover, the magnetic connection avoids the wear, fatigue, or malfunction issues associated with mechanical latches, ensuring long-term stable magnetic performance and a long service life. As an alternative, the opening and closing door 102 could be designed as a cover that can slide laterally or longitudinally, moving via a slide rail to expose or cover the limiting through hole 11; however, this arrangement occupies more space and wastes space. A detachable cover could also be used, but the operation is cumbersome. Therefore, the arrangement of this embodiment is preferred. The locking method of the opening and closing door 102 can adopt mechanical locking methods such as latches, rotating buckles, and elastic bead locking, which have a more obvious locking response, but the operation is complicated and will increase wear; or elastic protrusions or rubber pads can be set on the opening and closing door 102 or the guide structure 101, which rely on the deformation of the elastic material to achieve closure and fixation. The structure is simple, but repeated use of the elastic material may cause it to fail and the service life is short; therefore, the setting method of this embodiment is preferred.

[0046] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pressure-assisted training device for erhu bowing trajectory, characterized in that, include: The base (1) has a guide structure (101) for guiding the bow hair (13); The supported member (2) is connected to the base (1) and is used to support the base (1); the supported member (2) has an adsorption structure (201) for adsorbing onto the instrument cylinder by negative pressure.

2. The erhu bowing trajectory pressure-assisted training device according to claim 1, characterized in that, The adsorption structure (201) is a suction cup; the suction cup is adsorbed onto the instrument cylinder by venting through its own elasticity; the supported member (2) is provided with an air intake channel (3); the supported member (2) is connected to an opening and closing valve (4), which can open or close the air intake channel (3); the air intake channel (3) and the suction cup are connected sequentially along the air intake direction.

3. The erhu bowing trajectory pressure-assisted training device according to claim 2, characterized in that, The supported member (2) is provided with a rotating mating surface (5) and an air inlet (6); the air inlet (6), the air inlet channel (3) and the suction cup are connected in sequence along the air inlet direction; the opening and closing valve (4) has an air inlet (7), and the opening and closing valve (4) is rotatably mated with the rotating mating surface (5) so that the air inlet (7) can be connected to or isolated from the air inlet (6).

4. The erhu bowing trajectory pressure-assisted training device according to claim 3, characterized in that, The side wall of the supported member (2) with the air inlet (6) is the first fitting wall (8), and the side wall of the valve (4) with the air inlet (7) is the second fitting wall (9). The first fitting wall (8) and the second fitting wall (9) are slidably and sealingly connected.

5. The erhu bowing trajectory pressure-assisted training device according to claim 4, characterized in that, The opening and closing valve (4) is sleeved on the rotating mating surface (5), and the outer wall of the supported member (2) is provided with a positioning mark (10), which points to the air inlet (6).

6. The erhu bowing trajectory pressure-assisted training device according to claim 2, characterized in that, The supported member (2) is provided with a plurality of suction cups, and the plurality of suction cups are all connected to the same air intake channel (3).

7. The erhu bowing trajectory pressure-assisted training device according to claim 6, characterized in that, The supported member (2) is provided in multiple ways, and the multiple supported members (2) are connected to the opposite sides of the base (1).

8. The erhu bowing trajectory pressure-assisted training device according to claim 7, characterized in that, The supported component (2) includes a bendable sleeve (202) and a rigid pipe (203). The bendable sleeve (202) is sleeved around the rigid pipe (203) and connected to the base (1). The air intake channel (3) is located on the rigid pipe (203), and the on / off valve (4) is connected to the rigid pipe (203).

9. The erhu bowing trajectory pressure-assisted training device according to claim 8, characterized in that, The bendable sleeve (202) is a component made of elastic material.

10. The erhu bowing trajectory pressure-assisted training device according to claim 1, characterized in that, The guide structure (101) is provided with a limiting through hole (11) for the bow hair (13) to pass through; the base (1) also has an opening and closing door (102), the hinged end of the opening and closing door (102) is hinged to the guide structure (101) so that the swing end of the opening and closing door (102) can swing relative to the guide structure (101) to open or close the limiting through hole (11); one of the swing end of the opening and closing door (102) and the guide structure (101) is provided with a magnet, and the other is provided with a magnetic element, the magnet being used to attract the magnetic element.

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