Portable outdoor intelligent Bluetooth sound equipment

Abstract

The invention belongs to the technical field of Bluetooth sound equipment, in particular to a portable outdoor intelligent Bluetooth sound equipment, and aims to solve the problems in the prior art, the portable outdoor intelligent Bluetooth sound equipment comprises a sound equipment body, a fixing auxiliary mechanism is arranged in the bottom of the sound equipment body, and the fixing auxiliary mechanism comprises a cavity formed in the bottom of the sound equipment body; at least four rotating blocks are evenly arranged in the cavity, inclined blocks are fixedly connected to the two sides of the top of each rotating block, and supporting plates are evenly and fixedly connected to the inner wall of the circumferential side face of the cavity. According to the invention, through arrangement of the rotating block, the sound equipment body is held to align to outdoor placement points such as uneven stones and branches, and the telescopic plate is rotated to clamp uneven objects such as stones and branches, so that the device can be prevented from falling off due to the fact that the device cannot be stably fixed at an uneven or narrow position; elements such as a circuit board, a loudspeaker and a battery in the device are loosened or damaged, and the normal function of the device is influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of Bluetooth audio devices, and in particular to a portable outdoor intelligent Bluetooth audio device. Background Art

[0002] Bluetooth speakers are common vocal equipment for outdoor work with professional-grade sound quality, intelligent interaction, hardcore protection and portable design.

[0003] After searching, the invention patent with publication number CN118175469A is named as a portable smart Bluetooth speaker. The patented device drives the top cover, the speaker body and the moving rod to move upward by moving the telescopic rod upward. The upward movement of the moving rod will drive the first rack to move upward, thereby driving the first gear and the rotating shaft to rotate. The rotation of the rotating shaft drives the sleeve and the sliding block to move. The sliding block moves along the fixed frame to drive the moving frame and the support rod to move toward the outside of the box. When the support rod moves to the outside of the box, the fourth gear will engage with the fourth rack to drive the fourth gear and the rotating rod to rotate. The rotation of the rotating rod can realize the support rod from a horizontal state to a vertical state, thereby ensuring the stability of the box.

[0004] However, the patented device may fall because it cannot be stably fixed in an uneven or narrow location, causing components such as circuit boards, speakers, and batteries inside the device to become loose or damaged, affecting the normal function of the device. Summary of the Invention

[0005] Based on the technical problems existing in the prior art, the present invention proposes a portable outdoor smart Bluetooth speaker.

[0006] The present invention proposes a portable outdoor smart Bluetooth speaker, which includes a speaker body. A fixing auxiliary mechanism is provided inside the bottom of the speaker body. The fixing auxiliary mechanism includes a cavity opened at the bottom of the speaker body. At least four rotating blocks are evenly arranged inside the cavity. The top two sides of the rotating blocks are fixedly connected with oblique blocks. The inner wall of the circumferential side of the cavity is evenly fixedly connected with a support plate. The other end of the support plate is fixedly connected with an annular box located above the rotating block. The inner wall of the circumferential side of the annular box is slidably connected with a ring block. The top of the ring block is evenly fixedly connected with an extrusion frame aligned with the rotating block, and both ends of the extrusion frame are against the oblique blocks.

[0007] Preferably, a circular plate aligned with the rotating block is fixedly connected to the inner wall of the circumferential side of the cavity, and a rotating groove aligned with the rotating block is evenly opened between the top and bottom of the circular plate. A rotating shaft is rotatably connected between the two inner walls of the rotating groove, and the circumferential side of the rotating shaft is rotatably connected to the inside of the rotating block.

[0008] Preferably, the bottom of the rotating block is fixedly connected to a rotating box, the inner wall of the side of the rotating box is slidably connected to a telescopic plate, the other side of the telescopic plate is evenly fixedly connected to a clamping block, the top inner wall of the rotating box is fixedly connected to a limiting column aligned with the telescopic plate, a limiting groove is provided inside the telescopic plate, and the circumferential side of the limiting column is slidably connected to the inner wall of the circumferential side of the limiting groove.

[0009] Preferably, a spring four surrounding the limit column is fixedly connected between the top of the telescopic plate and the top inner wall of the rotating box, and a bottom plate is detachably connected to the bottom of the circumferential side of the cavity. Through grooves aligned with the telescopic plate are evenly opened between the top and bottom of the bottom plate, and the size of the through grooves is larger than the size of the telescopic plate.

[0010] Preferably, the top inner wall of the cavity is fixedly connected to a motor, the output shaft of the motor is fixedly connected to a screw, the circumferential side of the screw is threadedly connected to a connecting plate, and at least four lifting grooves are evenly opened between the inner wall and outer wall of the circumferential side of the annular box, and one end of the connecting plate passes through the lifting groove and is fixedly connected to the inner wall of the circumferential side of the ring block.

[0011] Preferably, an opening is provided between the top and bottom of the base plate, the bottom of the circular plate is fixedly connected to a fixed cylinder aligned with the opening, the inner wall of the circumferential side of the fixed cylinder is slidably connected to a sliding cylinder, the bottom of the sliding cylinder extends to the bottom of the fixed cylinder, and the outer wall of the circumferential side of the sliding cylinder is fixedly connected to a movable circular plate located below the fixed cylinder.

[0012] Preferably, at least four connecting columns passing through the circular plate are evenly fixedly connected between the top of the movable circular plate and the bottom of the connecting plate, the movable cylinder is slidably connected to the outer wall of the circumferential side of the sliding cylinder, the bottom of the movable cylinder is fixedly connected to a suction cup aligned with the opening, and a spring 1 surrounding the sliding cylinder is fixedly connected between the top of the movable cylinder and the bottom of the movable circular plate.

[0013] Preferably, the circumferential side of the suction cup abuts against the circumferential side of the opening, a connecting hole is provided between the bottom of the suction cup and the bottom of the moving cylinder, and a through opening located below the sliding cylinder is evenly provided between the inner and outer walls of the circumferential side of the moving cylinder.

[0014] Preferably, movable grooves aligned with the rotating box are evenly opened between the inner wall and the outer wall of the circumferential side of the audio body, and a groove connected to the movable groove is opened inside the circumferential side of the audio body. A lifting frame is slidably connected between the two inner walls of the movable groove, and the circumferential side of the lifting frame is slidably connected to the circumferential side of the groove.

[0015] Preferably, a movable groove is provided on the side of the lifting frame, a connecting rod is slidably connected between the top inner wall and the bottom inner wall of the movable groove, a sliding groove is provided on the side of the rotating box, a spring three is fixedly connected between the side of the connecting rod and the side inner wall of the movable groove, the other end of the connecting rod passes through the sliding groove and is hinged to the side of the telescopic plate, a spring two is fixedly connected between the bottom of the lifting frame and the bottom inner wall of the movable groove, one end of the lifting frame is fixedly connected to a movable sleeve surrounding the speaker body, and the circumferential side surface of the movable sleeve is slidably connected to the circumferential side surface of the speaker body.

[0016] The beneficial effects of the present invention are: 1. By using the rotating block, hold the speaker body and aim it at an uneven placement point outdoors, such as uneven stones or branches. Rotate the telescopic plate and clamp uneven objects such as stones and branches. This helps prevent the device from falling due to instability in uneven or narrow locations, causing the circuit board, speaker, battery and other components inside the device to loosen or be damaged, affecting the normal function of the device. At the same time, the device can be installed at will in most uneven and narrow locations, improving the convenience of using the device.

[0017] 2. When the device is fixed on a plane by the provided suction cup, the motor is started, the motor drives the connecting plate to descend, and the connecting plate suction cup moves, so that the telescopic plate and the clamping block do not extend out of the device while the suction cup extends out of the device and is adsorbed on the placement plane, so that the device is adsorbed and fixed on a flat placement surface, thereby enabling the device to be fixed on uneven placement surfaces and flat placement surfaces, expanding the applicable range of the device when fixed, and helping to further prevent the device from falling off the placement surface during operation, causing internal and external damage to the device and affecting the safety of the device. When the device is working at a placement point that is not suitable for the suction cup, the telescopic plate is aligned with the through groove, the motor is started to drive the extrusion frame to rise, and the extrusion frame drives the telescopic plate and the clamping block to clamp the placement point while preventing the suction cup from extending out of the device, which is helpful to prevent the suction cup from contacting the outside world in the non-working state, causing the suction cup to gradually wear out and shortening the service life of the device. At the same time, the through groove is aligned with the telescopic plate, the motor is started, and the motor drives the extrusion frame to descend, so that the device is clamped from both sides of the placement point by the telescopic plate and the clamping block, and is clamped from above with the suction cup, which is helpful to make the inclined telescopic plate and the upper suction cup clamp the placement point with a triangular force, further improving the stability of the device when placed.

[0018] 3. Through the provided movable sleeve, the movable sleeve is pushed after the device is finished working, the movable sleeve drives the lifting frame to move, the lifting frame drives the connecting rod to move, the connecting rod drives the telescopic plate to be stored inside the device, and the bottom plate is rotated so that the through groove is staggered with the telescopic plate, which is conducive to the convenient storage of the device after the work is completed, thereby improving the convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic diagram of the overall structure of a portable outdoor smart Bluetooth speaker proposed by the present invention; Figure 2 This is a schematic diagram of the internal structure of a portable outdoor smart Bluetooth speaker proposed by the present invention; Figure 3 This is a partial structural diagram of a portable outdoor smart Bluetooth speaker proposed by the present invention; Figure 4 This is a schematic diagram of the connecting column structure of a portable outdoor smart Bluetooth speaker proposed by the present invention; Figure 5 This is a schematic diagram of the mobile tube structure of a portable outdoor smart Bluetooth speaker proposed by the present invention; Figure 6 for Figure 2 A magnified schematic diagram of the structure in the middle.

[0020] In the figure: 1-sound body, 2-fixed cylinder, 3-opening, 4-suction cup, 5-connecting column, 6-moving cylinder, 7-sliding cylinder, 8-through port, 9-spring one, 10-moving circular plate, 11-block, 12-telescopic plate, 13-limiting column, 14-chute, 15-connecting rod, 16-slot, 17-moving sleeve, 18-spring two, 19-spring three, 20-lifting frame, 21-rotating box, 22-rotating shaft, 23-rotating groove, 24-circular plate, 25-rotating block, 26-oblique block, 27-extrusion frame, 28-ring box, 29-connecting plate, 30-ring block, 31-screw, 32-motor, 33-spring four. DETAILED DESCRIPTION

[0021] Example 1, reference Figure 1-6 A portable outdoor smart Bluetooth speaker includes a speaker body 1. A fixing auxiliary mechanism is provided inside the bottom of the speaker body 1. The fixing auxiliary mechanism includes a cavity opened at the bottom of the speaker body 1. At least four rotating blocks 25 are evenly arranged inside the cavity. The top two sides of the rotating block 25 are fixedly connected with an inclined block 26. The inner wall of the circumferential side of the cavity is evenly fixed with a support plate. The other end of the support plate is fixedly connected with an annular box 28 located above the rotating block 25. The inner wall of the circumferential side of the annular box 28 is slidably connected with a ring block 30. The top of the ring block 30 is evenly fixed with an extrusion frame 27 aligned with the rotating block 25, and both ends of the extrusion frame 27 are against the inclined block 26.

[0022] In the present invention, a circular plate 24 aligned with the rotating block 25 is fixedly connected to the inner wall of the circumferential side of the cavity, and a rotating groove 23 aligned with the rotating block 25 is evenly opened between the top and bottom of the circular plate 24. A rotating shaft 22 is rotatably connected between the two inner walls of the rotating groove 23, and the circumferential side of the rotating shaft 22 is rotatably connected to the inside of the rotating block 25.

[0023] The bottom of the rotating block 25 is fixedly connected to the rotating box 21, and the inner wall of the side of the rotating box 21 is slidably connected to the telescopic plate 12. The other side of the telescopic plate 12 is evenly fixedly connected to the clamping block 11. The top inner wall of the rotating box 21 is fixedly connected to the limiting column 13 aligned with the telescopic plate 12. A limiting groove is provided inside the telescopic plate 12, and the circumferential side of the limiting column 13 is slidably connected to the inner wall of the circumferential side of the limiting groove.

[0024] A spring 433 surrounding the limit column 13 is fixedly connected between the top of the telescopic plate 12 and the top inner wall of the rotating box 21. A bottom plate is detachably connected to the bottom of the circumferential side of the cavity. Through grooves aligned with the telescopic plate 12 are evenly opened between the top and bottom of the bottom plate, and the size of the through grooves is larger than that of the telescopic plate 12.

[0025] A motor 32 is fixedly connected to the top inner wall of the cavity, and a screw rod 31 is fixedly connected to the output shaft of the motor 32. A connecting plate 29 is threadedly connected to the circumferential side of the screw rod 31. At least four lifting grooves are evenly opened between the inner wall and the outer wall of the circumferential side of the annular box 28. One end of the connecting plate 29 passes through the lifting groove and is fixedly connected to the inner wall of the circumferential side of the ring block 30.

[0026] When using the present invention: hold the speaker body 1, rotate the bottom plate, the bottom plate drives the through slot to rotate to the bottom of the telescopic plate 12, the spring 4 33 pushes the telescopic plate 12 to move, so that the telescopic plate 12 and the card block 11 extend out of the speaker body 1, and the telescopic plate 12 is aligned with the outdoor placement point such as uneven stones, branches, etc., and the motor 32 is started. The motor 32 drives the screw rod 31 to rotate, the screw rod 31 drives the connecting plate 29 to move, the connecting plate 29 drives the ring block 30 to move, the ring block 30 drives the extrusion frame 27 to move, and the extrusion frame 27 squeezes the oblique block 26. The inclined block 26 drives the rotating block 25 to rotate, the rotating block 25 drives the rotating box 21 to rotate, and the rotating box 21 drives the telescopic plate 12 and the clamping block 11 to rotate, so that the telescopic plate 12 clamps uneven objects such as stones and branches, which helps to prevent the device from falling due to instability in uneven or narrow positions, causing the circuit board, speaker, battery and other components inside the device to loosen or be damaged, affecting the normal function of the device. At the same time, the device can be installed at will in most uneven and narrow positions, thereby improving the convenience of using the device.

[0027] Example 2, reference Figure 2-5 A portable outdoor smart Bluetooth speaker includes an opening 3 between the top and bottom of the bottom plate, a fixed cylinder 2 aligned with the opening 3 is fixedly connected to the bottom of the circular plate 24, a sliding cylinder 7 is slidably connected to the inner wall of the circumferential side of the fixed cylinder 2, the bottom of the sliding cylinder 7 extends to the bottom of the fixed cylinder 2, and the outer wall of the circumferential side of the sliding cylinder 7 is fixedly connected to the movable circular plate 10 located below the fixed cylinder 2.

[0028] In the present invention, at least four connecting columns 5 passing through the circular plate 24 are evenly fixedly connected between the top of the movable circular plate 10 and the bottom of the connecting plate 29, the movable cylinder 6 is slidably connected to the outer wall of the circumferential side of the sliding cylinder 7, the bottom of the movable cylinder 6 is fixedly connected to the suction cup 4 aligned with the opening 3, and the top of the movable cylinder 6 and the bottom of the movable circular plate 10 are fixedly connected with a spring 9 surrounding the sliding cylinder 7.

[0029] The circumferential side of the suction cup 4 is against the circumferential side of the opening 3, and a connecting hole is opened between the bottom of the suction cup 4 and the bottom of the moving cylinder 6. A through hole 8 located below the sliding cylinder 7 is evenly opened between the inner wall and the outer wall of the circumferential side of the moving cylinder 6.

[0030] When the present invention is used: when the device is fixed on a plane, the motor 32 is started, the motor 32 drives the connecting plate 29 to descend, the connecting plate 29 drives the connecting column 5 to move, the connecting column 5 drives the moving circular plate 10 to descend, the moving circular plate 10 drives the moving cylinder 6 to move through the spring 9, and the moving cylinder 6 drives the suction cup 4 to move, so that the telescopic plate 12 and the block 11 do not extend out of the device while the suction cup 4 extends out of the device and is adsorbed on the placement plane, which is convenient for the device to be adsorbed and fixed on the flat placement surface, and then the device can be fixed on an uneven placement surface and a flat placement surface, expanding the applicable range of the device when fixed, which is conducive to further preventing the device from falling off the placement surface during operation, causing damage to the inside and outside of the device, affecting the safety of the device operation, and the device works in part When the placement point of the suction cup cannot be adapted to the point, the telescopic plate 12 is aligned with the through slot, the motor 32 is started to drive the extrusion frame 27 to rise, the extrusion frame 27 squeezes the oblique block 26, and the oblique block 26 drives the telescopic plate 12 and the card block 11 to clamp the placement point while preventing the suction cup 4 from extending out of the device, which is beneficial to preventing the suction cup 4 from contacting the outside world when not in operation, causing the suction cup 4 to gradually wear out and affecting the service life of the device. At the same time, the through slot is aligned with the telescopic plate 12, the motor 32 is started, and the motor 32 drives the extrusion frame 27 to descend, so that the device is clamped from both sides of the placement point by the telescopic plate 12 and the card block 11, and at the same time cooperates with the suction cup 4 to clamp from above, which is beneficial to the inclined telescopic plate 12 and the upper suction cup 4 to clamp the placement point with a triangular force, further improving the stability of the device when placed.

[0031] Example 3, reference Figure 1-5 A portable outdoor smart Bluetooth speaker includes a speaker body 1, wherein movable grooves aligned with a rotating box 21 are evenly opened between the inner and outer walls of the circumferential side surface, a slot 16 connected to the movable groove is opened inside the circumferential side surface of the speaker body 1, and a lifting frame 20 is slidably connected between the two inner walls of the movable groove, and the circumferential side surface of the lifting frame 20 is slidably connected to the circumferential side surface of the slot 16.

[0032] In the present invention, a movable groove is provided on the side of the lifting frame 20, and a connecting rod 15 is slidably connected between the top inner wall and the bottom inner wall of the movable groove. A sliding groove 14 is provided on the side of the rotating box 21, and a spring three 19 is fixedly connected between the side of the connecting rod 15 and the side inner wall of the movable groove. The other end of the connecting rod 15 passes through the sliding groove 14 and is hinged to the side of the telescopic plate 12. A spring two 18 is fixedly connected between the bottom of the lifting frame 20 and the bottom inner wall of the movable groove. One end of the lifting frame 20 is fixedly connected to a movable sleeve 17 surrounding the audio body 1, and the circumferential side surface of the movable sleeve 17 is slidably connected to the circumferential side surface of the audio body 1.

[0033] When the present invention is used: after the device finishes working, the movable sleeve 17 is pushed, the movable sleeve 17 drives the lifting frame 20 to move, the lifting frame 20 drives the connecting rod 15 to move, the connecting rod 15 drives the telescopic plate 12 to be retracted into the device, and the bottom plate is rotated so that the through groove is staggered with the telescopic plate 12, which is conducive to convenient storage of the device after work is completed, thereby improving the convenience of the device.

[0034] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A portable outdoor smart Bluetooth speaker, comprising a speaker body (1), characterized in that: A fixing auxiliary mechanism is provided inside the bottom of the acoustic body (1), and the fixing auxiliary mechanism includes a cavity opened at the bottom of the acoustic body (1), at least four rotating blocks (25) are evenly provided inside the cavity, and both sides of the top of the rotating block (25) are fixedly connected with an inclined block (26), and the inner wall of the circumferential side of the cavity is evenly fixedly connected with a support plate, and the other end of the support plate is fixedly connected with an annular box (28) located above the rotating block (25), and the inner wall of the circumferential side of the annular box (28) is slidably connected with a ring block (30), and the top of the ring block (30) is evenly fixedly connected with an extrusion frame (27) aligned with the rotating block (25), and both ends of the extrusion frame (27) are against the inclined block (26).

2. A portable outdoor smart Bluetooth speaker according to claim 1, characterized in that: A circular plate (24) aligned with the rotating block (25) is fixedly connected to the inner wall of the circumferential side of the cavity, and a rotating groove (23) aligned with the rotating block (25) is evenly opened between the top and bottom of the circular plate (24). A rotating shaft (22) is rotatably connected between the two inner walls of the rotating groove (23), and the circumferential side of the rotating shaft (22) is rotatably connected to the inside of the rotating block (25).

3. A portable outdoor smart Bluetooth speaker according to claim 2, characterized in that: The bottom of the rotating block (25) is fixedly connected to a rotating box (21), the inner wall of the side of the rotating box (21) is slidably connected to a telescopic plate (12), the other side of the telescopic plate (12) is evenly fixedly connected to a clamping block (11), the top inner wall of the rotating box (21) is fixedly connected to a limiting column (13) aligned with the telescopic plate (12), a limiting groove is provided inside the telescopic plate (12), and the circumferential side surface of the limiting column (13) is slidably connected to the inner wall of the circumferential side surface of the limiting groove.

4. A portable outdoor smart Bluetooth speaker according to claim 3, characterized in that: A spring (33) surrounding the limiting column (13) is fixedly connected between the top of the telescopic plate (12) and the top inner wall of the rotating box (21), and a bottom plate is detachably connected to the bottom of the circumferential side of the cavity. A through groove aligned with the telescopic plate (12) is evenly opened between the top and bottom of the bottom plate, and the size of the through groove is larger than the size of the telescopic plate (12).

5. The portable outdoor smart Bluetooth speaker according to claim 1, characterized in that: A motor (32) is fixedly connected to the inner wall of the top of the cavity, an output shaft of the motor (32) is fixedly connected to a screw rod (31), a connecting plate (29) is threadedly connected to the circumferential side of the screw rod (31), at least four lifting grooves are evenly opened between the inner wall and the outer wall of the circumferential side of the annular box (28), and one end of the connecting plate (29) passes through the lifting groove and is fixedly connected to the inner wall of the circumferential side of the ring block (30).

6. The portable outdoor smart Bluetooth speaker according to claim 4, characterized in that: An opening (3) is provided between the top and bottom of the base plate; the bottom of the circular plate (24) is fixedly connected to a fixed cylinder (2) aligned with the opening (3); the inner wall of the circumferential side of the fixed cylinder (2) is slidably connected to a sliding cylinder (7); the bottom of the sliding cylinder (7) extends to the bottom of the fixed cylinder (2); and the outer wall of the circumferential side of the sliding cylinder (7) is fixedly connected to a movable circular plate (10) located below the fixed cylinder (2).

7. The portable outdoor smart Bluetooth speaker according to claim 6, characterized in that: At least four connecting columns (5) passing through the circular plate (24) are evenly and fixedly connected between the top of the movable circular plate (10) and the bottom of the connecting plate (29); the movable cylinder (6) is slidably connected to the outer wall of the circumferential side of the sliding cylinder (7); the bottom of the movable cylinder (6) is fixedly connected to a suction cup (4) aligned with the opening (3); and a spring (9) surrounding the sliding cylinder (7) is fixedly connected between the top of the movable cylinder (6) and the bottom of the movable circular plate (10).

8. The portable outdoor smart Bluetooth speaker according to claim 7, characterized in that: The circumferential side surface of the suction cup (4) abuts against the circumferential side surface of the opening (3), a connecting hole is provided between the bottom of the suction cup (4) and the bottom of the movable cylinder (6), and a through opening (8) located below the sliding cylinder (7) is evenly provided between the inner wall and the outer wall of the circumferential side surface of the movable cylinder (6).

9. The portable outdoor smart Bluetooth speaker according to claim 8, characterized in that: A movable groove aligned with the rotating box (21) is evenly provided between the inner wall and the outer wall of the circumferential side surface of the audio body (1); a slot (16) connected to the movable groove is provided inside the circumferential side surface of the audio body (1); a lifting frame (20) is slidably connected between the two inner walls of the movable groove; and the circumferential side surface of the lifting frame (20) is slidably connected to the circumferential side surface of the slot (16).

10. The portable outdoor smart Bluetooth speaker according to claim 9, characterized in that: A movable groove is provided on the side of the lifting frame (20), and a connecting rod (15) is slidably connected between the top inner wall and the bottom inner wall of the movable groove. A sliding groove (14) is provided on the side of the rotating box (21), and a spring three (19) is fixedly connected between the side of the connecting rod (15) and the side inner wall of the movable groove. The other end of the connecting rod (15) passes through the sliding groove (14) and is hinged to the side of the telescopic plate (12). A spring two (18) is fixedly connected between the bottom of the lifting frame (20) and the bottom inner wall of the movable groove. One end of the lifting frame (20) is fixedly connected to a movable sleeve (17) surrounding the sound body (1), and the circumferential side of the movable sleeve (17) is slidably connected to the circumferential side of the sound body (1).

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