CN109949781B - Adjustable buckle for strap-type musical instrument and method of use thereof - Google Patents

Abstract

The invention relates to the field of musical instrument fasteners, in particular to an adjustable buckle for strap-type musical instruments and a method for using the same, comprising a chute set on the piano body and a bracket connected to one end of the strap, the chute passes through a first lock The buckle mechanism is connected to the slide bar. There is a long groove on the slide bar. The pin sleeve is connected to the slide bar through the third lock mechanism. A second locking mechanism for controlling the retraction of the strap is arranged on the top, the lower end of the bracket is fixed to the latch, the bracket is connected in the pin sleeve through the latch, and the latch can rotate freely in the pin sleeve. The adjustable buckle for a strap-type musical instrument and its use method can adjust the position of the buckle arbitrarily, and the operation is simple and convenient during adjustment, and under the action of the hand roll, the length of the strap can be adjusted arbitrarily to suit the For people of different body shapes and different arm lengths, the insertion/disassembly operation of the buckle is simple and convenient, and it is convenient to use.

Description

Adjustable buckle for strap-type musical instrument and method of use thereof

technical field

The invention relates to the field of musical instrument fasteners, in particular to an adjustable buckle for a strap-type musical instrument and a use method thereof.

Background technique

Guitars and basses usually have a flat strip-shaped strap. On the one hand, this strap is convenient for carrying and hanging the instrument; The operation of the string part, such as: application number 201510361313.4 discloses an electric guitar belt, which is fixedly connected to the belt body and the piano body through the belt head consisting of a female buckle and a female buckle, and 90° can be carried out between the female buckle and the female buckle. ° rotation, it is convenient to flexibly adjust the posture and movement of the electric guitar when playing, and avoid the slipping of the belt body, but the connection between the head and the body is fixed, and the belt body cannot be retracted and adjusted. People who are fat or thin, and people with different arm lengths cannot adjust the position of the piano body when playing. In view of this, we propose an adjustable buckle for a strap-type musical instrument and its usage method.

Contents of the invention

The object of the present invention is to provide an adjustable buckle for a strap-type musical instrument and its usage method, so as to solve the problems raised in the above-mentioned background technology. In order to achieve the above object, the present invention provides the following technical solutions: an adjustable buckle for a strap-type musical instrument and its use method, comprising a chute set on the piano body and a bracket connected to one end of the strap, the chute passes through the first A locking mechanism is connected to the sliding bar. There is a long groove on the sliding bar, and the direction of the groove is perpendicular to the direction of the chute. There is a reel for rewinding the braces, on which there is a second locking mechanism for controlling the retraction of the straps, the lower end of the bracket is fixed with a pin, the bracket is connected to the pin sleeve through the pin, and the inside of the pin sleeve is provided with a pair of The locking pin assembly of the latch lock, and the latch can rotate freely in the pin sleeve.

Preferably, teeth are provided on the inner wall of the chute along the length direction, the first locking mechanism includes a slider 1 fixed on the middle part of the lower surface of the slide bar, the middle part of the slider 1 is slidably inserted with a pull rod, and the slider 1 A clamping plate is hingedly connected to the side wall of the lower surface close to the chute, and the clamping plate is provided with teeth corresponding to the teeth on the side wall of the chute.

Preferably, the lower end of the pull rod passes through the slider and points to the bottom of the chute, the lower end of the pull rod is connected to the slider by a spring one, the lower end of the pull rod is symmetrically hinged to connect two connecting rods, and the connecting rod and the corresponding clamping plate Hinged connection at the back.

Preferably, the bottom surface of the groove is provided with teeth along the length, the third locking mechanism includes a slider 2 slidably connected to the slide bar, the middle part of the bottom surface of the slider 2 is provided with a guide groove, and the inside of the guide groove is slidably inserted There are multi-edged rods, and the cross-section of the guide groove matches the cross-section of the multi-edged rods. The lower end of the multi-edged rods is fixed with a pressing block, and the lower surface of the pressing block is provided with teeth that mesh with the teeth on the bottom surface of the groove. , and the pressing block and the slider two are connected by a spring four.

Preferably, a screw is threadedly connected to the side of the slider two, the upper end of the screw is fixed with a gear, and the lower end of the screw is in contact with the pressing block.

Preferably, the upper surface of the slider 2 is fixed with a pin sleeve, and the center of the pin sleeve is provided with a pin hole matched with the bolt, and the side wall of the middle part of the pin sleeve is provided with a stepped through hole in the radial direction, and the lower part of the pin hole Sliding connection has top plate, and top plate connects slide block two by spring six.

Preferably, the outer side of the pin sleeve is sleeved with a drum, the upper port of the drum is connected to the upper port of the pin sleeve through no less than two springs, and the outer wall of the drum is provided with teeth meshing with the gear along the circumferential direction. , and the gear is a spur gear.

Preferably, the buckle pin assembly includes a pin rod slidably inserted into the inside of the stepped through hole and an inner bush fixed on the upper part of the inner wall of the drum. The stepped surfaces of the holes are connected by spring five, the inner wall of the inner bushing is a tapered surface structure, and contacts with the wedge-shaped surface of the pin rod pointing to the end of the drum, the lower end of the pin is ball-shaped, and a ring groove is opened in the middle , the end of the pin rod pointing to the inside of the pin hole can be engaged with the ring groove.

Preferably, the outer wall of the reel is fixed with a guide sleeve communicating with the interior, the central axis of the reel is fixed with a rotating shaft, and the two ends of the reel are rotatably connected to the bracket. The second locking mechanism includes a pressing plate, a splint, a guide Rod and spring 2. The guide rod slides and penetrates on the side wall of the guide sleeve. The end of the guide rod pointing to the inside of the guide sleeve is fixedly connected to the splint. The end of the guide rod pointing to the outside of the guide sleeve is fixedly connected to the pressure plate, and the pressure plate and the guide sleeve are connected by a spring Two connections, one end of the strap is connected to the rotating shaft by a coil spring, and the other end of the strap passes between the splint and the inner wall of the guide sleeve.

A method for using an adjustable buckle for a strap-type musical instrument, comprising the following steps:

Step 1: Adjust the position of the sliding bar on the chute through the first locking mechanism, and adjust the position of the pin sleeve on the sliding bar through the third locking mechanism;

Step 2: Complete the connection between the strap and the piano body by inserting or removing the pin and the pin sleeve;

Step 3: Adjust and fix the length of the strap through the second locking mechanism.

Compared with the prior art, the invention has the beneficial effects: the position of the buckle can be adjusted arbitrarily on the chute and the slide bar, and the operation is simple and convenient during the adjustment, and under the action of the winding drum, The length of the strap can be adjusted arbitrarily, so as to be suitable for people of different body shapes and arm lengths, which improves practicality, and the insertion/disassembly of the buckle is simple and convenient to operate and easy to use.

Description of drawings

Fig. 1 is a top view of the assembly structure of the present invention;

Fig. 2 is a schematic diagram of the A-A cross-sectional structure of the locked state of the first locking mechanism in Fig. 1;

Fig. 3 is a schematic diagram of the A-A cross-sectional structure of the first locking mechanism in Fig. 1 when it is released;

Fig. 4 is the B-B sectional structure schematic diagram in Fig. 1;

Fig. 5 is a partial structural schematic diagram in Fig. 4;

Fig. 6 is a schematic diagram of the unconnected state of the latch and the pin sleeve in Fig. 4;

Fig. 7 is a schematic diagram of the structure of the third locking mechanism in the released state of the present invention;

Fig. 8 is a schematic diagram of the C-C section structure in Fig. 4;

FIG. 9 is a schematic diagram of the D-D cross-sectional structure in FIG. 1 .

In the figure: 1-chute; 2-first locking mechanism; 201-slider one; 202-pull rod; 203-card plate; 204-connecting rod; 5-winding reel; 501-guide sleeve; 502-rotating shaft; 6-second locking mechanism; 601-pressure plate; 602-splint; 603-guide rod; 604-spring two; 7-bolt; 8-drum; 9-spring three; 10-pin sleeve; 11-slider two; 12-screw; 13-gear; 14-guide groove; 15-polygonal rod; 16-spring four; 18-buckle pin assembly; 19-pin hole; 20-inner bushing; 21-pin rod; 22-spring five; 23-top plate; 24-spring six; 25-third locking mechanism.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Referring to Figs. 1-9, the present invention provides a technical solution: an adjustable buckle for a strap-type musical instrument and its use method, including a chute 1 provided on the piano body and a bracket 4 connected to one end of the strap, The other end of the strap is fixedly connected to the other end of the piano body. The chute 1 is connected to the slide bar 3 through the first locking mechanism 2. The slide bar 3 is provided with a long groove, and the direction of the groove is consistent with the direction of the chute. 1 is vertical, the slide bar 3 is connected to the pin sleeve 10 through the third locking mechanism 25, and the fixed axis rotation on the bracket 4 is connected with a reel 5 for rewinding the strap, and the reel 5 is provided with a reel 5 for controlling the rewinding of the strap. Put the second locking mechanism 6, the lower end of the bracket 4 is fixed with a latch 7, the bracket 4 is connected in the pin sleeve 10 through the latch 7, and the pin sleeve 10 is internally provided with a buckle pin assembly 18 for locking the latch 7, and the latch 7 is in the The inside of the pin sleeve 10 can rotate freely.

In this embodiment, teeth are provided on the inner wall of the chute 1 along the length direction. The first locking mechanism 2 includes a slider 201 fixed on the middle part of the lower surface of the slide bar 3 . The connection between them is T-shaped or dovetail-shaped, and the middle part of slider one 201 is slidably inserted with a pull rod 202, and the lower surface of slider one 201 is hingedly connected with a clamping plate 203 near the side wall of the chute 1, and the clamping plate 203 Teeth corresponding to the teeth on the side wall of the chute 1 are provided on the top.

In this embodiment, the lower end of the pull rod 202 passes through the slider one 201 and points to the bottom of the chute 1, the lower end of the pull rod 202 is connected with the slider one 201 through the spring one 205, and the lower end of the pull rod 202 is symmetrically hinged to connect the two connecting rods 204, and the connecting rod 204 is hingedly connected with the corresponding backside of the clamp 203, and when the clamp 203 is separated from the chute 1, the pull rod 202 needs to be lifted, so that when playing, even if the pull rod 202 is touched by mistake, the slider one 201 will also Can remain fixed with the chute 1.

In this embodiment, the bottom surface of the groove is provided with teeth along the length, and the third locking mechanism 25 includes a slider 2 11 slidably connected to the slide bar 3, and the connection between the slider 11 and the groove The place is T-shaped or dovetail-shaped, and the middle part of the bottom surface of the slider 2 11 is provided with a guide groove 14, and the inside of the guide groove 14 is slidably inserted into the multi-edged rod 15, and the cross-section of the guide groove 14 is the same as that of the multi-edged rod 15. Cooperate, the lower end of polygonal rod 15 is fixed with briquetting 17, and the lower surface of briquetting 17 is provided with the teeth that mesh with the teeth on the bottom surface of the groove, and between briquetting 17 and slide block 2 11 passes spring 4 16 connected, the multi-edged rod 15 and the guide groove 14 play a position-limiting and guiding role to prevent the pressing block 17 from rotating, and the spring four 16 plays the role of lifting the pressing block 17, so that it can be kept at the position of the pin sleeve 10 when moving, Ensure that the pressing block 17 can be separated from the teeth at the bottom of the groove without being under the pressure of the screw rod 12 .

In this embodiment, a screw rod 12 is threadedly connected to the position near the side of the slider two 11, the upper end of the screw rod 12 is fixed with a gear 13, and the lower end of the screw rod 12 is in contact with the pressure block 17 but is not fixed, and is only in a state of contact.

In this embodiment, the upper surface of the slider 11 is fixed with a pin sleeve 10, and the center of the pin sleeve 10 is provided with a pin hole 19 that matches the latch 7, as shown in Figures 4 and 5, the upper port of the pin hole 19 can be The design is bell-shaped, so that the latch 7 can be inserted into the pin hole 19 quickly and accurately. The middle side wall of the pin sleeve 10 is provided with a stepped through hole in the radial direction, and the bottom of the pin hole 19 is slidably connected with a top plate 23, and the top plate 23 connects slide block two 11 by spring six 24.

In this embodiment, the outer side of the pin sleeve 10 is sleeved with a drum 8, the upper port of the drum 8 and the upper port of the pin sleeve 10 are connected by no less than two springs 39, and the outer wall of the drum 8 moves along the circumference. There are teeth meshed with the gear 13, and the gear 13 is a spur gear. When the drum 8 is rotated, the drum 8 should not move up and down in the axial direction. The gear 13 is a spur gear to prevent the drum 8 from moving in the axial direction. The rotation of the gear 13 is caused during the upward movement, thereby keeping the position of the pin sleeve 10 loose during the insertion or removal of the buckle.

In this embodiment, the buckle pin assembly 18 includes a pin rod 21 slidably inserted into the stepped through hole and an inner bushing 20 fixed on the upper part of the inner wall of the drum 8. Both ends of the pin rod 21 are wedge-shaped surfaces, and the inclined surface is upward. , the stepped surface of the pin rod 21 and the stepped through hole are connected by a spring five 22, the inner wall of the inner bushing 20 is a tapered surface structure, and is in surface contact with the wedge-shaped surface of the pin rod 21 pointing to the end of the drum 8, the initial state Next, the downward force exerted by the spring three 9 on the drum 8 should be greater than the upward force exerted by the spring five 22 on the drum 8 through the pin rod 21 and the inner bushing 20. The ring groove 701 , the end of the pin rod 21 pointing to the inside of the pin hole 19 can be engaged with the ring groove 701 .

In this embodiment, the outer wall of the reel 5 is fixed with a guide sleeve 501 communicating with its interior, and the central axis of the reel 5 is fixed with a rotating shaft 502, and the two ends of the reel 502 are rotatably connected to the bracket 4, so that the The winding reel 5 can rotate on the support 4, and in the state of buckle connection, the support 4 can also rotate on the pin sleeve 10, so that when playing, the strap can be adjusted according to the action of the musician. Second locking mechanism 6 comprises pressing plate 601, clamping plate 602, guide rod 603 and spring 2 604, and guide rod 603 is slidably inserted on the side wall of guide sleeve 501, and guide rod 603 is fixedly connected splint 602 to one end of guide sleeve 501 inside, guide One end of the rod 603 pointing to the outside of the guide sleeve 501 is fixedly connected to the pressure plate 601, and the pressure plate 601 and the guide sleeve 501 are connected by a spring 2 604, and one end of the strap is connected to the rotating shaft 502 by a coil spring, which makes the strap wind up on the rotating shaft 502 , and the other end of the strap passes between the splint 602 and the inner wall of the guide sleeve 501, the strap is positioned between the two guide rods 603 when passing through the splint 602 and the inner wall of the guide sleeve 501, the contact surface of the splint 602 and the strap Provided with bumps that increase friction.

The application also provides a method for using an adjustable buckle for a strap-type musical instrument, which comprises the following steps during operation:

Step 1: Adjust the position of the strap buckle on the piano body:

Position adjustment on the chute 1: as shown in Figure 1, Figure 2 and Figure 3, pinch the pull rod 202 by hand and lift it up, so that the pull rod 202 rises, and the rise of the pull rod 202 compresses the spring one 205 to obtain a restoring force At the same time, through the connecting rod 204, the force is applied to the clamping plate 203, so that the clamping plate 203 rotates around the connection between the clamping plate 203 and the slider one 201, and the rotation of the clamping plate 203 makes the teeth on the clamping plate 203 and the chute 1 The teeth on the side wall are separated, and the pull rod 202 is kept still, and at the same time, the slider 1 201 is pushed to move to the desired position on the chute 1, the movement of the slider 201 drives the slider 3 to move synchronously, and then the pull rod 202 is released , the pull rod 202 moves down under the action of the restoring force of the spring one 205, and the downward movement of the pull rod 202 exerts a force on the clamping plate 203 through the connecting rod 204, so that the clamping plate 203 reverses around the joint between the clamping plate 203 and the slider one 201. To rotate, the reverse rotation of the clamping plate 203 makes the teeth on the clamping plate 203 mesh with the teeth on the side wall of the chute 1, and the slider one 201 is positioned on the chute 1 under the action of the spring one 202;

Position adjustment on the slider 3: as shown in Figure 1, Figure 5, Figure 7 and Figure 8, hold the drum 8 by hand and make it rotate, the rotation of the drum 8 drives the gear 13 to rotate through its outer teeth, At the same time, the rotation of the drum 8 drives the spring three 9 to twist to obtain a recovery torque. The rotation of the gear 13 drives the screw 12 to rotate synchronously. The power that block 17 exerts weakens, and drives briquetting block 17 to move up under the effect of spring 4 16, and the moving up of briquetting block 17 makes the teeth on the lower surface of briquetting block 17 separate from the teeth on the bottom surface of the groove. During the upward movement, the polygonal rod 15 and the guide groove 14 act as a limit guide to avoid the rotation of the pressing block 17. After the pressing block 17 moves upward, the drum 8 is kept stationary, and at the same time, the slider 2 11 is pushed on the groove. Move to the desired position, the movement of the slider 2 11 drives the pin sleeve 10 to move synchronously, and then the drum 8 is released, and the drum 8 is driven to rotate reversely under the action of the recovery torque of the spring 3 9, and the reverse rotation of the drum 8 drives The gear 13 reverses, and the reverse of the gear 13 drives the screw 12 to turn over synchronously. Under the action of the screw drive, the screw 12 moves down and exerts a downward force on the pressing block 17 so that the teeth on the pressing block 17 and the bottom surface of the groove The teeth are meshed so that the slider 2 11 is positioned on the slider 3;

Step 2: Insert or disassemble the buckle: as shown in Figure 4, Figure 5 and Figure 6, when inserting the buckle, hold the bracket 4 to align the pin 7 with the pin hole 19 and insert it inward, and the ball head of the pin 7 contacts When the pin rod 21 is located at one end of the pin hole 19, the effect of applying force to the pin rod 19, under the guidance of the wedge-shaped surface and the thrust of the spring five 22, the pin rod 21 is moved to the outside of the pin hole 19, and the pin rod 21 moves outward. While moving, tension spring 5 22 is stretched, and the wedge-shaped surface on one end of the drum 8 is pointed to by the pin rod 21 so that the drum 8 moves up to compress the spring 3 9, and the movement of the pin rod 21 avoids the latch 7 so that the latch 7 Continue to insert into the pin hole 19 until the pin rod 21 is matched with the ring groove 701. At this time, the latch 7 does not exert force on the pin rod 21, and the spring three 9 exerts a downward reaction force on the drum 8 so that the drum 8 Move down and reset, the reset of the drum 8, apply force to the pin rod 21 through the inner bushing 20 to reset it and compress the spring 5 22 at the same time, after the plug 7 is inserted into the pin hole 19, the ball head squeezes the top plate 24 and is compressed by the top plate 24 The six springs 24 make the six springs 24 have a restoring force to complete the insertion of the buckle, so that the strap and the piano body are connected stably;

When the buckle needs to be disassembled, pinch the drum 8 with your hands and move it up to compress the spring 3 9. The upward movement of the drum 8 drives the inner bush 20 to move up synchronously. , under the action of spring five 22, the pin rod 21 moves outward, separates from the ring groove 701, and has no limit on the latch 7. Under the restoring force of spring six 24, the latch 7 is pushed out of the pin hole 19 through the top plate 23 to realize buckle removal;

Step 3: Adjust the strap length: as shown in Fig. 1 and Fig. 9, when the strap needs to be lengthened, pinch the pressure plate 601 with your hands so that the pressure plate 601 approaches the guide sleeve 501, and compress the spring 2 604 to obtain a restoring force, When the pressure plate 601 moves, the splint 602 is driven to move synchronously through the guide post 603, and the strap is released, and at the same time, the strap is pulled out to lengthen the strap. Under the action, the pressure plate 601 and the splint 602 are driven to reset at the same time, and the strap is clamped and fixed under the action of the spring 2 604;

When it is necessary to shorten the strap, as mentioned above, pinch the pressure plate 601 with your hands so that the pressure plate 601 approaches the guide sleeve 501. When the pressure plate 601 moves, it drives the splint 602 to move synchronously through the guide post 603, and releases the strap without applying external force to the strap. , under the action of the coil spring on the rotating shaft 502, the strap is rolled into the inside of the winding drum 5, the strap is shortened, and after reaching the required length, the pressing plate 601 is released, and the pressing plate 601 and the pressing plate are driven under the restoring force of the spring 2 604. The splint 602 resets at the same time, and clamps and fixes the strap under the action of the second spring 604 to complete the adjustment of the strap length;

This kind of buckle can adjust the position of the buckle on the chute 1 and the slide bar 3 arbitrarily, and the operation is simple and convenient during adjustment, and under the action of the winding drum 5, the length of the strap can be adjusted arbitrarily to be suitable for People with different body types and different arm lengths improve the practicality, and the insertion/disassembly of the buckle is simple and convenient to operate and easy to use.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and those described in the above-mentioned embodiments and description are only preferred examples of the present invention, and are not intended to limit the present invention, without departing from the spirit and scope of the present invention. Under the premise, the present invention will also have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. An adjustable buckle for a strap-type musical instrument, comprising a chute (1) provided on the piano body and a support (4) connected to one end of the strap, characterized in that: the chute (1) passes through The first locking mechanism (2) is connected to the slide bar (3), and the slide bar (3) is provided with an elongated groove, and the direction of the groove is perpendicular to the direction of the chute (1), and the slide bar (3) connect the pin sleeve (10) by the third locking mechanism (25), and the fixed axis rotation on the said support (4) is connected with the reel (5) that is used for rewinding the braces, and the reel (5) 5) is provided with a second locking mechanism (6) for controlling the strap retraction, the lower end of the bracket (4) is fixed with a latch (7), and the bracket (4) is connected to the pin sleeve through the latch (7) (10), the inside of the pin sleeve (10) is provided with a buckle pin assembly (18) for locking the latch (7), and the latch (7) can rotate freely in the pin sleeve (10); The bottom surface of the groove is provided with teeth running along the length, and the third locking mechanism (25) includes a slider two (11) that is slidably connected to the slide bar (3), and the slider two (11) ) is provided with a guide groove (14) in the middle of the bottom surface, and the inside of the guide groove (14) is slidingly inserted into the multi-edged rod (15), and the cross-section of the guide groove (14) and the cross-section of the multi-edged rod (15) In cooperation, the lower end of the polygonal rod (15) is fixed with a briquetting block (17), the lower surface of the briquetting block (17) is provided with teeth meshing with the teeth on the bottom surface of the groove, and the briquetting block ( 17) is connected with the slider two (11) by spring four (16); Said slide block two (11) is threadedly connected with a screw rod (12) near the side, the upper end of said screw rod (12) is fixed with a gear (13), and the lower end of said screw rod (12) is connected with the briquetting block (17). )touch; The upper surface of the slider two (11) is fixed with a pin sleeve (10), and the center of the pin sleeve (10) is provided with a pin hole (19) matched with the latch (7), and the pin sleeve ( 10) The middle side wall is provided with a stepped through hole in the radial direction, and the bottom of the pin hole (19) is slidingly connected with a top plate (23), and the top plate (23) is connected to the slider two ( 11); The outer side of the pin sleeve (10) is sleeved with a drum (8), and the upper port of the drum (8) is connected to the upper port of the pin sleeve (10) through no less than two springs (9), The outer wall of the drum (8) is provided with teeth meshing with the gear (13) along the circumference, and the gear (13) is a spur gear; The inner pin rod (21) and the inner bushing (20) fixed on the upper part of the inner wall of the drum (8), the two ends of the pin rod (21) are wedge-shaped surfaces, and the inclined surface is upward, and the pin rod (21) ) and the stepped surface of the stepped through hole are connected by spring five (22), the inner wall of the inner bushing (20) is a tapered surface structure, and is connected with the pin rod (21) pointing to one end of the drum (8) Wedge-shaped surface-to-face contact, the lower end of the latch (7) is ball-shaped, and a ring groove (701) is opened in the middle, and the end of the pin rod (21) pointing to the inside of the pin hole (19) can be connected to the ring groove (701) )Card access. 2. The adjustable buckle for a strap-type musical instrument according to claim 1, characterized in that: teeth are provided on the inner wall of the chute (1) along the length direction, and the first lock buckle The mechanism (2) includes a slider one (201) fixed on the middle part of the lower surface of the slide bar (3), the middle part of the slider one (201) is slide-connected with a pull rod (202), A clamping plate (203) is hingedly connected to the lower surface of the lower surface near the side wall of the chute (1), and the clamping plate (203) is provided with teeth corresponding to the teeth on the side wall of the chute (1). 3. The adjustable buckle for strap-type musical instruments according to claim 2, characterized in that: the lower end of the pull rod (202) passes through slider one (201) and points to the bottom of the chute (1) , the lower end of the pull rod (202) is connected to the slider one (201) through the spring one (205), the lower end of the pull rod (202) is symmetrically hinged to connect two connecting rods (204), and the connecting rod (204) It is hingedly connected with the back side of the corresponding clamping plate (203). 4. The adjustable buckle for a strap-type musical instrument according to claim 1, characterized in that: a guide sleeve (501) communicating with the inside is fixed on the outer wall of the reel (5), and the A rotating shaft (502) is fixed at the central axis of the winding drum (5), and both ends of the rotating shaft (502) are rotatably connected to the bracket (4), and the second locking mechanism (6) includes a pressing plate (601) , splint (602), guide rod (603) and spring two (604), described guide rod (603) slides and penetrates on the side wall of guide sleeve (501), and described guide rod (603) points to guide sleeve (501 ) inside one end is fixedly connected to the splint (602), the guide rod (603) points to the outside end of the guide sleeve (501) and is fixedly connected to the pressure plate (601), and the pressure plate (601) and the guide sleeve (501) are connected by two springs (604) is connected, and one end of the strap is connected to the rotating shaft (502) by a coil spring, and the other end of the strap passes between the splint (602) and the inner wall of the guide sleeve (501). 5. The method for using an adjustable buckle for a strap-type musical instrument according to claim 1, characterized in that: comprising the following steps: Step 1: Adjust the position of the sliding bar (3) on the chute (1) through the first locking mechanism (2), and adjust the position of the pin sleeve (10) on the sliding bar (3) through the third locking mechanism (25) s position; Step 2: Complete the connection between the strap and the piano body by inserting or disassembling the pin (7) and the pin sleeve (10); Step 3: Adjust and fix the length of the strap through the second locking mechanism (6). 6. The method for using an adjustable buckle for a strap-type musical instrument according to claim 5, characterized in that: in step one, The specific process of adjusting the position on the slider is as follows: pinch the drum with your hands and make it rotate. The rotation of the drum drives the gear to rotate through the teeth on the outside, and at the same time, the rotation of the drum drives the spring to twist three times to obtain a The torque is restored, the rotation of the gear drives the screw to rotate synchronously, and under the action of the thread transmission, the screw drives the gear to move up synchronously, and the upward movement of the screw weakens the force exerted on the pressing block, and under the action of the spring four, the pressing block moves up, and the pressing block moves upward. Moving up makes the teeth on the lower surface of the pressing block separate from the teeth on the bottom surface of the groove. During the upward movement of the pressing block, the multi-edged rod and the guide groove play a role of limiting and guiding, preventing the pressing block from rotating. Keep the drum still after moving, and push the slider 2 to move to the required position on the groove at the same time, the movement of the slider 2 drives the pin sleeve to move synchronously, then release the drum, and drive the rotor under the restoring torque of the spring 3 The barrel rotates in the opposite direction, the reversal of the barrel drives the gear to reverse, and the reverse of the gear drives the screw to turn over synchronously. Under the action of the screw drive, the screw moves down and exerts a downward force on the pressure block to make the teeth on the pressure block Engage with the teeth on the bottom surface of the groove, so that the slider 2 is positioned on the slide bar.

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