Noise-canceling speaker

Abstract

The present invention belongs to the technical field of loudspeakers, especially noise-canceling loudspeakers. Aiming at the problem that the loudspeaker in the prior art generates noise due to the instantaneous change of current, the following solution is proposed. It includes a main outer box, a main panel and a bottom plate located at the bottom, which form a cuboid box structure. High-frequency speakers and low-frequency speakers are respectively embedded near the upper and lower ends in the middle position of the main panel. The top inner wall of the main outer box is fixed with a PC circuit board, and a frequency divider and a transformer are respectively arranged on the PC circuit board. A perforation is opened near the top at the rear side of the main outer box of the device, and a high-frequency isolation barrel sleeving the high-frequency speaker is fixed between the perforation and the high-frequency speaker. When the loudspeaker of the present invention works, it can not only isolate the harmonic current generated when each electrical appliance is transformed, but also block the harmonic current generated when the frequency divider works, preventing it from affecting the coil in the low-frequency speaker, thereby reducing the main noise generated therefrom.

Description

Technical Field

[0001] The present invention relates to the technical field of speakers, and particularly to noise-canceling speakers. Background Art

[0002] A speaker is a transducer device that converts electrical signals into sound signals. The performance of the speaker has a great impact on the sound quality. Audio electrical energy makes its paper cone or diaphragm vibrate through electromagnetic, piezoelectric or electrostatic effects and resonate with the surrounding air to emit sound; therefore, noise reduction of the speaker is an important component in audio equipment.

[0003] After retrieval, among the numerous factors affecting the sound quality of the speaker, the instantaneous change of the external current is the main factor leading to the appearance of noise and the most non-negligible noise. To solve the generation of this noise, some manufacturers have adopted a split transformer, or set a larger speaker box space to install the transformer, or set up a complex filter circuit. These methods not only solve problems singly, but also have high production costs. Adding an additional filter circuit makes the device more prone to failures and cannot perform noise reduction well. Therefore, we propose a new type of noise-canceling speaker. Summary of the Invention

[0004] Aiming at the technical problem that the speaker in the prior art is affected by the instantaneous change of the current and generates noise, the present invention adopts the following technical solutions:

[0005] The noise-canceling speaker includes a main outer box, a main panel and a bottom plate located at the bottom, which form a cuboid box structure. The main panel is a vertical rectangular structure, and a high-frequency speaker and a low-frequency speaker are respectively embedded near the upper and lower ends in the middle position of the main panel. A PC circuit board is fixed to the inner top wall of the main outer box, and a frequency divider and a transformer are respectively arranged on the PC circuit board; a perforation is opened near the top at the rear side of the main outer box of the device, and a high-frequency isolation barrel sleeving the high-frequency speaker is fixed between the perforation and the high-frequency speaker. A shielding iron box with an upward opening is fixed to the inner top wall of the main outer box above the high-frequency isolation barrel, and the shielding iron box completely covers the frequency divider and the transformer. A wiring pipe is fixed to the side of the main panel close to the inside of the device, and the wiring pipe is neatly located on the surface of the main panel; a connecting sleeve is penetrated between the circumferential outer wall of the high-frequency isolation barrel and the bottom of the shielding iron box, and a heat dissipation fan is arranged inside the connecting sleeve; heat dissipation holes are arranged at the top of the main outer box at the position of the PC circuit board; the main outer box and the main panel are made of density board, and the bottom plate is made of solid wood.

[0006] Further settings are as follows. A sunken handle groove is provided at the top of the main body outer box near the main panel, and a U-shaped handle is rotatably connected in the handle groove; a circular convex rib is fixedly provided on the inner circumferential wall of the pipe orifice at one end of the high-frequency isolation barrel away from the tweeter. With the circular convex rib and the handle provided, when the device needs to be moved, one only needs to hold the handle with one hand and hold the circular convex rib at the pipe orifice of the high-frequency isolation barrel with the other hand.

[0007] Further settings are as follows. Mounting holes 1 and 2 with different diameters are respectively opened near the upper and lower ends in the middle of the main panel. The upper mounting hole 1 is adapted to the diameter of the speaker cone of the tweeter, and the lower mounting hole 2 is adapted to the size of the woofer.

[0008] A strip-shaped air hole is opened in the middle of the main panel between the woofer and the tweeter, and a strip-shaped filter screen is attached to the front of the strip-shaped air hole, and a dust-proof net is attached to the upper surface of the heat dissipation hole. By providing the strip-shaped air hole, the internal and external air pressures can be ensured to be consistent.

[0009] Further settings are as follows. A large round hole is opened on the back of the main body outer box, which is the back of the whole device, and an extension chamber is provided in the large round hole. The extension chamber includes a main fixed sleeve embedded and fixed in the large round hole. The inner circumferential wall of the main fixed sleeve is slidably sleeved with an intermediate sleeve, and the inner circumferential wall of the intermediate sleeve is slidably sleeved with a rear cover barrel with an opening facing the inside of the device. Among them, axial extension limiting chutes are opened on the inner circumferential walls of the main fixed sleeve and the intermediate sleeve, and guide sliders are reserved at the same end of the outer circumferential walls of the intermediate sleeve and the rear cover barrel. The axis of the extension chamber is consistent with the height of the woofer and is coaxially distributed, and the inner diameter of the main fixed sleeve is 1.5 times the diameter of the woofer.

[0010] Further settings are as follows. An inverted T-shaped roller frame is fixed at the edge of the inner wall of the back of the main body outer box near the large round hole. The bottom end of the T-shaped roller frame is provided with two parallel side guard bars. One end of the two side guard bars extends into the main fixed sleeve. A driving pulley and a driven pulley are respectively rotatably connected between the two ends of the two side guard bars, and the same transmission belt is wound between the outer circumferential walls of the driving pulley and the driven pulley. A Z-shaped push rod is fixed between the surface of the transmission belt and the barrel orifice of the rear cover barrel. With the transmission belt and the Z-shaped push rod provided, when the size of the extension chamber needs to be controlled, one only needs to adjust the forward and reverse rotation of the driving pulley.

[0011] Further settings are as follows. A vertical strip-shaped hole is opened on the side of the main body outer box near the end of the axle of the driving pulley. A protruding belt box is embedded in the strip-shaped hole. The opening of the protruding belt box faces the inside of the device. A lower half section at the opening of the protruding belt box is fixed with an inner cover plate. A sliding bearing is embedded in the middle of the bottom end of the inner cover plate. A long shaft rod is rotatably connected in the sliding bearing. One end of the long shaft rod close to the driving pulley is fixed to the end of the rotating shaft of the driving pulley through a coupling. A second pulley is fixed to the other end of the long shaft rod. A servo motor is fixed on the top inner wall of the main body outer box obliquely above the protruding belt box. A first pulley is fixed to the top end of the output shaft of the servo motor. The first pulley and the second pulley form a transmission connection. A motor shielding outer cover is arranged around the servo motor. The motor shielding outer cover is welded to the side of the shielding iron box. Harmonic current generated when the servo motor starts can be shielded.

[0012] A groove is opened near the top on the front surface of the main panel. A controller for controlling the forward and reverse rotation of the servo motor is arranged on the back of the groove. A toggle switch is arranged on the controller. The forward and reverse rotation of the servo motor can be realized through the arranged toggle switch. An alarm lamp is also arranged in the groove. Then it drives the expansion and contraction of the extension chamber.

[0013] Further settings are as follows. A horizontal metal welding plate seat is fixed between the two side guard plates of the T-shaped roller frame. The metal welding plate seat is located between the two reversely moving conveyor belts and on the lower surface of the conveyor belt near the top position. A circular insulating spring seat is fixed in the middle of the lower surface of the metal welding plate seat. A return spring is fixed to the lower surface of the insulating spring seat. The bottom end of the return spring is fixed with a bullet-shaped wear-resistant contact block. A plurality of ball grooves are opened near the bottom end on the outside of the wear-resistant contact block. A micro roller is embedded in each ball groove. A metal contact rod passing through the insulating spring seat is fixed to the lower surface of the metal welding plate seat. Among them, wiring terminals are arranged at the roots of the metal welding plate seat and the return spring. The two wiring terminals are connected in series in the alarm circuit. The bottom end of the wear-resistant contact block abuts against the surface of the conveyor belt. Therefore, when the conveyor belt moves, the return spring is pulled and bent and contacts the internal metal contact rod. At this time, the alarm circuit is connected, and the alarm lamp in the groove lights up green, indicating that the extension chamber is expanding or contracting normally. After the conveyor belt pulls the extension chamber to expand or contract to the limit, the conveyor belt is restricted and slips with the driving pulley. At this time, the conveyor belt stops rotating. The bottom end of the wear-resistant contact block loses the lateral pulling force of the conveyor belt and becomes vertical under the action of the return spring. At this time, the return spring is separated from the metal contact rod, the alarm circuit is disconnected, and the alarm lamp in the groove lights up red. At this time, just turn off the servo motor. The toggle switch has three switch positions. When it is in the middle, the servo motor is turned off. The left and right sides are forward and reverse respectively.

[0014] A further configuration is that an LED light bar is fixed to the side of the T-shaped roller frame; a control switch of the LED light bar is connected to a control switch of the speaker, and the LED light bar is a marquee.

[0015] A further configuration is that screw holes are opened on the lower surface of the base plate near the two rear corners, and self-locking studs are screwed in the screw holes, and rubber support blocks are fixed to the bottom ends of the self-locking studs; symmetrical rectangular holes are opened on the lower surface of the base plate near the two corners on the front side of the device; mounting strips are fixed above the rectangular holes, and shock-absorbing feet are hinged on the lower surfaces of the mounting strips near the opposite ends, and a buffer spring is fixed between the end of the upper surface of the shock-absorbing foot away from the intersection and the lower surface of the mounting strip; a hemispherical pad is fixed at the contact point between the bottom end of the shock-absorbing foot and the ground.

[0016] A further configuration is that the woofer includes a horn frame fixed in the second mounting hole, the horn frame as a whole is a funnel-shaped structure with a leaking hole, and three pins symmetrically distributed in the center are reserved at the bottom of the horn frame, a convex ridge is fixed at one end of the three pins close to the middle, and a permanent magnet ring is sleeved on the outer wall of the three pins, a T-shaped metal pole is inserted on the side of the permanent magnet ring away from the horn frame, an annular groove matching the convex ridge is reserved on the outer wall of the magnetic pole circle of the T-shaped metal pole, and a corrugated reset paper ring is fixed on the inner wall of the circumference near the bottom of the horn frame, a paper tube is fixed in the middle of the corrugated reset paper ring, a coil is wound on the outer wall of the thin neck end of the paper tube, and the end of the paper tube away from the permanent magnet ring is fixed to the edge of the horn frame through a rubber ring; the paper tube is sleeved on the magnetic pole of the T-shaped metal pole; the woofer configured in this way makes splicing more convenient, and if the installation is not in place during testing, it is possible to quickly detect where the problem is.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention, by setting a shielding iron box on the top of the high-frequency isolation barrel, can not only isolate the harmonic currents generated by the voltage transformation of various electrical appliances when the speaker is working, but also block the harmonic currents generated by the crossover when it is working, to prevent the influence on the coil in the woofer, thereby reducing the main noise generated.

[0019] 2. The present invention provides an extended chamber, and the size of the extended chamber can be adjusted according to the user's listening habits during use, thereby reducing the resonance of the sound in the speaker and lowering the noise.

[0020] 3. The buffer spring and hemispherical pad provided in the present invention can absorb certain vibrations when the speaker is working, thereby reducing the noise generated by the resonance of the hard desktop. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of the noise-canceling speaker proposed by the present invention;

[0022] Figure 2 Bottom view of the noise-canceling speaker proposed by the present invention;

[0023] Figure 3 Top view of the noise-canceling speaker proposed by the present invention during the process of pushing out the extension chamber;

[0024] Figure 4 The noise-canceling speaker proposed by the present invention Figure 3 Schematic diagram of the sectional structure along line A-A in the noise-canceling speaker proposed by the present invention;

[0025] Figure 5 The noise-canceling speaker proposed by the present invention Figure 4 Enlarged schematic diagram of the structure at B in the noise-canceling speaker proposed by the present invention;

[0026] Figure 6 Schematic diagram of the structure of the noise-canceling speaker proposed by the present invention when the extension chamber is pushed out;

[0027] Figure 7 Schematic diagram of the assembly structure of the high-frequency isolation barrel in the noise-canceling speaker proposed by the present invention;

[0028] Figure 8 Schematic diagram of the assembly structure of the T-shaped roller frame in the noise-canceling speaker proposed by the present invention;

[0029] Figure 9 Schematic diagram of the half-sectional structure of the main body outer box in the noise-canceling speaker proposed by the present invention;

[0030] Figure 10 Schematic diagram of the assembly structure of the shielding iron box in the noise-canceling speaker proposed by the present invention;

[0031] Figure 11 Schematic diagram of the shock-absorbing support feet in the noise-canceling speaker proposed by the present invention;

[0032] Figure 12 Exploded schematic diagram of the bass speaker in the noise-canceling speaker proposed by the present invention.

[0033] In the figure: 1. Main body outer box; 2. Intermediate sleeve; 3. Rear cover barrel; 4. Convex belt box; 401. Inner cover plate; 5. Rubber support block; 6. Bottom plate; 601. Rectangular hole; 7. Shock-absorbing support foot; 701. Hemispherical cushion block; 702. Buffer spring; 8. Woofer; 81. Speaker frame; 82. Pin; 83. Permanent magnet ring; 84. T-shaped metal magnetic pole; 85. Coil; 86. Paper tube; 87. Corrugated reset paper ring; 9. Main panel; 901. Embedded groove; 902. Strip-shaped air hole; 903. Mounting hole 1; 904. Wiring pipe; 10. Tweeter; 11. Toggle switch; 12. Handle groove; 13. Handle; 14. Heat dissipation hole; 15. Strip-shaped filter screen; 16. Main fixed sleeve; 17. PC circuit board; 18. Transformer; 19. Cooling fan; 20. Frequency divider; 21. Shielding iron box; 2101. Motor shielding outer cover; 22. High-frequency isolation barrel; 23. T-shaped roller frame; 2301. LED light bar; 24. Return spring; 241. Wear-resistant contact block; 242. Micro roller; 243. Metal contact rod; 244. Metal welding plate seat; 25. Transmission belt; 26. Z-shaped push-pull rod; 27. Driving pulley; 28. Long shaft rod; 29. Pulley 2; 30. Servo motor; 31. Mounting plate strip. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0035] In the present invention, with reference to Figure 1-12, A noise-canceling speaker, including a main outer box 1, a main panel 9 and a bottom plate 6 located at the bottom, which form a rectangular box structure. The inner walls of the device, including the main outer box 1, the main panel 9 and the bottom plate 6, are all pasted with heat-insulating cotton; the main panel 9 is a vertical rectangular structure, and a high-frequency speaker 10 and a woofer 8 are respectively embedded near the upper and lower ends in the middle position of the main panel 9. And a PC circuit board 17 is fixed on the top inner wall of the main outer box 1, and a frequency divider 20 and a transformer 18 are respectively arranged on the PC circuit board 17; a perforation is opened near the top at the rear side of the main outer box 1 of the device, and a high-frequency isolation barrel 22 sleeving the high-frequency speaker 10 is fixed between the perforation and the high-frequency speaker 10. A shielding iron box 21 with an upward opening is fixed above the high-frequency isolation barrel 22 on the top inner wall of the main outer box 1, and the shielding iron box 21 completely covers the frequency divider 20 and the transformer 18. A wiring pipe 904 is fixed on one side of the main panel 9 close to the inside of the device, and the wiring pipe 904 is neatly located on the surface of the main panel 9; a connecting sleeve is penetrated between the circumferential outer wall of the high-frequency isolation barrel 22 and the bottom of the shielding iron box 21, and a heat dissipation fan 19 is arranged inside the connecting sleeve; a heat dissipation hole 14 is arranged at the top of the main outer box 1 at the position of the PC circuit board 17; the main outer box 1 and the main panel 9 are made of density board material, and the bottom plate 6 is made of solid wood material. By setting the shielding iron box 21 at the top end of the high-frequency isolation barrel 22, when the speaker works, not only can the harmonic current generated during the voltage transformation of each electrical appliance be isolated, but also the harmonic current generated during the operation of the frequency divider 20 can be blocked, preventing it from affecting the coil 85 in the woofer 8, thereby reducing the main noise generated.

[0036] A sunken handle groove 12 is arranged at the top of the main outer box 1 near the main panel 9, and a U-shaped handle 13 is rotatably connected in the handle groove 12; a circular convex rib is fixed on the circumferential inner wall of the pipe orifice at one end of the high-frequency isolation barrel 22 far from the high-frequency speaker 10; by setting the circular convex rib in cooperation with the handle 13, when the device needs to be moved, only one hand needs to hold the handle 13 and the other hand needs to hold the circular convex rib at the pipe orifice of the high-frequency isolation barrel 22.

[0037] Refer to Figure 9 , on the main panel 9, mounting holes one 903 and mounting holes two with different diameters are respectively opened near the upper and lower ends in the middle. The mounting hole one 903 located above is adapted to the diameter of the speaker disc of the high-frequency speaker 10, and the mounting hole two located below is adapted to the size of the woofer 8;

[0038] A strip-shaped air hole 902 is opened in the middle of the main panel 9 between the woofer 8 and the high-frequency speaker 10, and a strip-shaped filter screen 15 is pasted on the front surface of the strip-shaped air hole 902, and a dust-proof net is pasted on the upper surface of the heat dissipation hole 14; by setting the strip-shaped air hole 902, the internal and external air pressures can be ensured to be consistent.

[0039] Refer toFigure 4 and Figure 9 , on the back of the main outer box 1, which is also the back of the overall device, there is a large round hole, and an extension chamber is provided in the large round hole. The extension chamber includes a main fixing sleeve 16 fixedly installed in the large round hole. A middle sleeve 2 is slidably sleeved on the inner circumferential wall of the main fixing sleeve 16, and a rear cover barrel 3 with an opening facing the inside of the device is slidably sleeved on the inner circumferential wall of the middle sleeve 2. Among them, the inner circumferential walls of the main fixing sleeve 16 and the middle sleeve 2 are provided with axially extending limiting chutes, and at the same end of the outer circumferential walls of the middle sleeve 2 and the rear cover barrel 3, raised guiding sliders are reserved. The axis of the extension chamber is consistent with the height of the bass speaker 8 and is coaxially distributed, and the inner diameter of the main fixing sleeve 16 is 1.5 times the diameter of the bass speaker 8. By providing the extension chamber, the space size of the extension chamber can be adjusted according to the user's listening habit during use, thereby reducing the resonance of the sound in the speaker and reducing the noise.

[0040] Refer to Figure 4-6 , at the edge of the inner wall of the back of the main outer box 1 near the large round hole, an inverted T-shaped T-shaped roller frame 23 is fixed. The bottom end of the T-shaped roller frame 23 is provided with two parallel side guard bars, and one end of the two side guard bars extends into the inside of the main fixing sleeve 16. A driving pulley 27 and a driven pulley are respectively rotatably connected between the two ends of the two side guard bars, and the same transmission belt 25 is wound between the outer circumferential walls of the driving pulley 27 and the driven pulley; A Z-shaped push rod 26 is fixed between the surface of the transmission belt 25 and the mouth of the rear cover barrel 3; By providing the transmission belt 25 in cooperation with the Z-shaped push rod 26, when it is necessary to control the space size of the extension chamber, only the forward and reverse rotation of the driving pulley 27 needs to be adjusted.

[0041] Refer to Figure 4 and Figure 6 , on the side of the main outer box 1 near the end of the wheel shaft of the driving pulley 27, a vertical strip-shaped hole is opened, and a protruding belt box 4 is embedded in the strip-shaped hole. The opening of the protruding belt box 4 faces the inside of the device. The lower half of the opening of the protruding belt box 4 is fixed with an inner cover plate 401, and a sliding bearing is embedded in the middle of the bottom end of the inner cover plate 401. A long shaft rod 28 is rotatably connected in the sliding bearing. One end of the long shaft rod 28 close to the driving pulley 27 is fixed to the end of the rotating shaft of the driving pulley 27 through a coupling, and the other end of the long shaft rod 28 is fixed with a pulley two 29; On the top inner wall of the main outer box 1, a servo motor 30 is fixed obliquely above the protruding belt box 4, and a pulley one is fixed to the top end of the output shaft of the servo motor 30. The pulley one and the pulley two 29 form a transmission connection; And a motor shielding outer cover 2101 is arranged around the servo motor 30; The motor shielding outer cover 2101 is welded to the side of the shielding iron box 21; The harmonic current generated when the servo motor 30 starts can be shielded;

[0042] A groove 901 is formed near the top of the front surface of the main panel 9, and a controller for controlling the forward and reverse rotation of the servo motor 30 is provided on the back surface of the groove 901. A toggle switch 11 is provided on the controller; the forward and reverse rotation of the servo motor 30 can be realized through the provided toggle switch 11, and an alarm lamp is also provided in the groove 901; then the expansion and contraction of the extension chamber are driven.

[0043] Refer to Figure 4-5 and Figure 8 As shown in [relevant figure numbers], a horizontal metal welding plate seat 244 is fixed between the two side guards of the T-shaped roller rack 23, and the metal welding plate seat 244 is located between the two reverse-moving conveyor belts 25, and the metal welding plate seat 244 is located on the lower surface of the conveyor belt 25 near the top position; a circular insulating spring seat is fixed in the middle of the lower surface of the metal welding plate seat 244, and a return spring 24 is fixed on the lower surface of the insulating spring seat. The bottom end of the return spring 24 is fixed with a bullet-shaped wear-resistant contact block 241, and a plurality of ball grooves are formed near the bottom end of the outer part of the wear-resistant contact block 241, and a micro roller 242 is embedded in each ball groove; a metal contact rod 243 passing through the insulating spring seat is fixed on the lower surface of the metal welding plate seat 244; among them, wiring terminals are provided at the roots of the metal welding plate seat 244 and the return spring 24, and the two wiring terminals are connected in series in the alarm circuit; the bottom end of the wear-resistant contact block 241 abuts against the surface of the conveyor belt 25, so when the conveyor belt 25 moves, the return spring 24 is pulled and bent and contacts the internal metal contact rod 243. At this time, the alarm circuit is connected, and the alarm lamp in the groove 901 lights up green, indicating that the extension chamber is expanding or contracting normally. When the conveyor belt 25 pulls the extension chamber to expand or contract to the limit, the conveyor belt 25 is restricted and slips with the driving pulley 27. At this time, the conveyor belt 25 stops rotating, and the bottom end of the wear-resistant contact block 241 loses the lateral pulling force of the conveyor belt 25 and becomes vertical under the action of the return spring 24. At this time, the return spring 24 is separated from the metal contact rod 243, the alarm circuit is disconnected, and the alarm lamp in the groove 901 lights up red. At this time, the servo motor 30 can be turned off; the toggle switch 11 has three switch positions. When it is in the middle, the servo motor 30 is turned off, and the left and right sides are for forward and reverse rotation respectively.

[0044] Refer to Figure 8 As shown in [relevant figure numbers], an LED light strip 2301 is fixed on the side of the T-shaped roller rack 23; the control switch of the LED light strip 2301 is connected to the control switch of the speaker, and the LED light strip 2301 is a running light.

[0045] Refer to Figure 2 and Figure 11, screw holes are provided at the lower surface of the bottom plate 6 near the two rear corners, and self-locking studs are screwed in the screw holes. Rubber support blocks 5 are fixed at the bottom ends of the self-locking studs; rectangular holes 601 that are symmetric to each other are respectively provided at the lower surface of the bottom plate 6 near the two front corners of the device; an installation strip 31 is fixed above the rectangular hole 601, and shock-absorbing feet 7 are hinged at the lower surface of the installation strip 31 near the opposite ends. A buffer spring 702 is fixed between the upper surface of the shock-absorbing foot 7 away from the joint point and the lower surface of the installation strip 31; a hemispherical cushion block 701 is fixed at the contact position between the bottom end of the shock-absorbing foot 7 and the ground; by providing the buffer spring 702 and the hemispherical cushion block 701, certain vibrations can be absorbed when the speaker is working, and the noise generated by the resonance from the hard desktop can be reduced.

[0046] Refer to Figure 9 and Figure 12 , the woofer 8 includes a speaker frame 81 fixed in the second mounting hole. The overall shape of the speaker frame 81 is a funnel-shaped structure with leak holes, and three pins 82 distributed in central symmetry are reserved at the bottom of the speaker frame 81. A convex rib is fixed at one end of the three pins 82 close to the middle, and a permanent magnet ring 83 is sleeved on the outer wall of the three pins 82. A T-shaped metal magnetic pole 84 is inserted on the side of the permanent magnet ring 83 away from the speaker frame 81. An annular card slot adapted to the convex rib is reserved on the circumferential outer wall of the magnetic pole of the T-shaped metal magnetic pole 84, and a corrugated reset paper ring 87 is fixed on the inner wall of the circumferential bottom of the speaker frame 81 close to the bottom. A paper tube 86 is fixed in the middle of the corrugated reset paper ring 87. A coil 85 is wound around the outer wall of the thin neck end of the paper tube 86, and one end of the paper tube 86 away from the permanent magnet ring 83 is fixed at the edge of the speaker frame 81 through a rubber ring; the paper tube 86 is sleeved on the magnetic pole of the T-shaped metal magnetic pole 84; by setting the woofer 8 in this way, the splicing is more convenient, and if there is an improper installation during the test, it can be quickly detected where the problem lies.

[0047] When the device is in use, it is ensured that there is a large space on the rear side of the device for the expansion of the extension chamber. When in use, the size of the extension chamber is adjusted according to the user's listening habits. The larger the space, the better the sound absorption effect, thereby reducing the resonance of the sound in the speaker and reducing the noise. Specifically, when adjusting the size of the extension chamber, according to the indication of the toggle direction above the embedded groove 901 on the main panel 9, the toggle switch 11 is toggled. At this time, the servo motor 30 starts to rotate, and under a series of belt drives, the final Z-shaped push-pull rod 26 is driven to move, thereby driving the expansion or contraction of the extension cavity. At the same time, the bottom end of the wear-resistant abutment block 241 abuts against the surface of the conveyor belt 25, that is, when the conveyor belt 25 moves. At this time, the return spring 24 is bent and contacts the internal metal contact rod 243. At this time, the alarm circuit is turned on, and the alarm light in the embedded groove 901 lights up green, indicating that the extension chamber is expanding or shrinking normally. When the transmission belt 25 pulls the extension chamber to expand or shrink to the limit, the transmission belt 25 is restricted and slips with the active pulley 27. At this time, the transmission belt 25 stops rotating, and the bottom end of the wear-resistant resistance block 241 loses the lateral pulling force of the transmission belt 25 and becomes vertical under the action of the return spring 24. At this time, the return spring 24 is out of contact with the metal contact rod 243, the alarm circuit is disconnected, and the alarm light in the embedded groove 901 lights up red. At this time, the servo motor 30 can be turned off.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A noise-reducing speaker, comprising a main outer box (1) having a cuboid box structure, a main panel (9), and a bottom plate (6) located at the bottom surface. The main panel (9) is a vertical rectangular structure, and a tweeter (10) and a woofer (8) are respectively embedded near the upper and lower ends at the middle position of the main panel (9). A PC circuit board (17) is fixed to the inner top wall of the main outer box (1), and a frequency divider (20) and a transformer (18) are respectively arranged on the PC circuit board (17); it is characterized in that, The main outer box (1) is provided with a perforation near the top at the rear side of the device, and a high-frequency isolation barrel (22) sleeving the high-frequency speaker (10) is fixed between the perforation and the high-frequency speaker (10). A shielding iron box (21) with an upward opening is fixed on the top inner wall of the main outer box (1) above the high-frequency isolation barrel (22). The shielding iron box (21) completely covers the frequency divider (20) and the transformer (18). A wiring pipe (904) is fixed on one side of the main panel (9) close to the inside of the device, and the wiring pipe (904) is neatly located at the position attached to the surface of the main panel (9); A connecting sleeve is penetrated between the circumferential outer wall of the high-frequency isolation barrel (22) and the bottom of the shielding iron box (21), and a cooling fan (19) is arranged inside the connecting sleeve; A heat dissipation hole (14) is arranged at the top of the main outer box (1) at the position of the PC circuit board (17); The main outer box (1) and the main panel (9) are made of density board material, and the bottom plate (6) is made of solid wood material.

2. The noise-canceling speaker according to claim 1, wherein A sunken handle groove (12) is arranged at the top of the main outer box (1) close to the main panel (9), and a U-shaped handle (13) is rotatably connected in the handle groove (12); A circular convex rib is fixed on the circumferential inner wall of the pipe orifice at one end of the high-frequency isolation barrel (22) far from the high-frequency speaker (10).

3. The noise-canceling speaker according to claim 1, characterized in that, Installation holes one (903) and installation holes two with different diameters are respectively arranged in the middle of the main panel (9) close to the upper and lower ends. The installation hole one (903) located above is adapted to the diameter of the speaker disk of the high-frequency speaker (10), and the installation hole two located below is adapted to the size of the low-frequency speaker (8); A strip-shaped air hole (902) is arranged in the middle of the main panel (9) between the low-frequency speaker (8) and the high-frequency speaker (10), and a strip-shaped filter screen (15) is attached to the front of the strip-shaped air hole (902), and a dust-proof net is attached to the upper surface of the heat dissipation hole (14).

4. The noise-canceling speaker according to claim 3, wherein, A large circular hole is arranged on the back of the main outer box (1), i.e., the back of the whole device, and an extension chamber is arranged in the large circular hole. The extension chamber includes a main fixed sleeve (16) embedded and fixed in the large circular hole. An intermediate sleeve (2) is slidably sleeved on the circumferential inner wall of the main fixed sleeve (16), and a rear cover barrel (3) with an opening facing the inside of the device is slidably sleeved on the circumferential inner wall of the intermediate sleeve (2); Among them, axial extension limiting chutes are arranged on the circumferential inner walls of the main fixed sleeve (16) and the intermediate sleeve (2), and guide sliders are reserved at the same end of the circumferential outer walls of the intermediate sleeve (2) and the rear cover barrel (3); The axis of the extension chamber is consistent with the height of the low-frequency speaker (8) and is coaxially distributed, and the inner diameter of the main fixed sleeve (16) is equal to 1.5 times the diameter of the low-frequency speaker (8).

5. The noise-canceling speaker according to claim 4, wherein, At the edge of the inner wall of the back surface of the main body outer box (1) near the large round hole, an inverted T-shaped roller frame (23) of a T-shaped structure is fixed, and two parallel side guard bars are arranged at the bottom end of the T-shaped roller frame (23). One end of the two side guard bars extends into the main fixed sleeve (16). A driving pulley (27) and a driven pulley are respectively rotatably connected between the two ends of the two side guard bars, and the same transmission belt (25) is wound between the circumferential outer walls of the driving pulley (27) and the driven pulley; A Z-shaped push rod (26) is fixed between the surface of the transmission belt (25) and the barrel opening of the rear cover barrel (3).

6. The noise-canceling speaker according to claim 5, characterized in that, A vertical strip-shaped hole is opened on the side surface of the main body outer box (1) near the end of the wheel shaft of the driving pulley (27), and a protruding belt box (4) is embedded in the strip-shaped hole. The opening of the protruding belt box (4) faces the inside of the device. An inner cover plate (401) is fixed at the lower half of the opening of the protruding belt box (4). A sliding bearing is embedded in the middle of the bottom end of the inner cover plate (401). A long shaft rod (28) is rotatably connected in the sliding bearing. One end of the long shaft rod (28) close to the driving pulley (27) is fixed to the end of the rotating shaft of the driving pulley (27) through a coupling. A second pulley (29) is fixed at the other end of the long shaft rod (28); A servo motor (30) is fixed on the top inner wall of the main body outer box (1) obliquely above the protruding belt box (4), and a first pulley is fixed at the top end of the output shaft of the servo motor (30). The first pulley and the second pulley (29) form a transmission connection; And a motor shielding outer cover (2101) is arranged around the servo motor (30); The motor shielding outer cover (2101) is welded to the side surface of the shielding iron box (21); A groove (901) is opened near the top of the front surface of the main panel (9), and a controller for controlling the forward and reverse rotation of the servo motor (30) is arranged on the back surface of the groove (901). A toggle switch (11) is arranged on the controller; An alarm lamp is also arranged in the groove (901).

7. The noise-canceling speaker according to claim 6, wherein A horizontal metal welding plate seat (244) is fixed between the two side guards of the T-shaped roller rack (23), and the metal welding plate seat (244) is located between two reversely moving conveyor belts (25), and the metal welding plate seat (244) is located on the lower surface of the conveyor belt (25) near the top position; an annular insulating spring seat is fixed in the middle of the lower surface of the metal welding plate seat (244), and a return spring (24) is fixed on the lower surface of the insulating spring seat. The bottom end of the return spring (24) is fixed with a bullet-shaped wear-resistant contact block (241), and a plurality of ball grooves are opened near the bottom end of the outer part of the wear-resistant contact block (241), and each ball groove is embedded with a micro roller (242); a metal contact rod (243) is fixed on the lower surface of the metal welding plate seat (244) and passes through the insulating spring seat; wherein, wiring terminals are arranged at the roots of the metal welding plate seat (244) and the return spring (24), and the two wiring terminals are connected in series in the alarm circuit; the bottom end of the wear-resistant contact block (241) abuts against the surface of the conveyor belt (25), so when the conveyor belt (25) moves, the return spring (24) is bent and contacts the internal metal contact rod (243). At this time, the alarm circuit is connected, and the alarm light in the embedded groove (901) lights up green, indicating that the extension chamber is normally expanded or contracted. After the conveyor belt (25) pulls the extension chamber to expand or contract to the limit, the conveyor belt (25) is restricted and slips with the driving pulley (27). At this time, the conveyor belt (25) stops rotating, the bottom end of the wear-resistant contact block (241) loses the lateral pulling force of the conveyor belt (25), and becomes vertical under the action of the return spring (24). At this time, the return spring (24) is disengaged from the metal contact rod (243), the alarm circuit is disconnected, and the alarm light in the embedded groove (901) lights up red. At this time, the servo motor (30) can be turned off; the toggle switch (11) has three switch positions. When it is in the middle, the servo motor (30) is turned off, and the left and right sides are forward and reverse respectively.

8. The noise-canceling speaker according to claim 5, wherein An LED light bar (2301) is fixed on the side of the T-shaped roller rack (23); the control switch of the LED light bar (2301) is connected to the control switch of the speaker, and the LED light bar (2301) is a running light.

9. The noise-canceling speaker according to claim 1, characterized in that, Screw holes are opened at two corners near the rear side of the lower surface of the bottom plate (6), and self-locking studs are screwed in the screw holes. Rubber support blocks (5) are fixed at the bottom ends of the self-locking studs; rectangular holes (601) symmetrical to each other are respectively opened at two corners near the front side of the device on the lower surface of the bottom plate (6); a mounting plate strip (31) is fixed above the rectangular holes (601), and shock-absorbing feet (7) are hinged at opposite ends of the lower surface of the mounting plate strip (31). A buffer spring (702) is fixed between the upper surface of the shock-absorbing foot (7) far from the joint point and the lower surface of the mounting plate strip (31); a hemispherical cushion block (701) is fixed at the contact point between the bottom end of the shock-absorbing foot (7) and the ground.

10. The noise-canceling speaker according to claim 1, characterized in that, The woofer (8) includes a speaker frame (81) fixed in the second mounting hole. The overall shape of the speaker frame (81) is a funnel-shaped structure with leak holes, and three pins (82) distributed in central symmetry are reserved at the bottom of the speaker frame (81). A convex rib is fixed at one end of the three pins (82) close to the middle, and a permanent magnet ring (83) is sleeved on the outer wall of the three pins (82). A T-shaped metal magnetic pole (84) is inserted on the side of the permanent magnet ring (83) away from the speaker frame (81). An annular card slot adapted to the convex rib is reserved on the circumferential outer wall of the magnetic pole of the T-shaped metal magnetic pole (84), and a corrugated reset paper ring (87) is fixed on the inner wall of the circumferential bottom of the speaker frame (81). A paper tube (86) is fixed in the middle of the corrugated reset paper ring (87). A coil (85) is wound around the outer wall of the thin neck end of the paper tube (86), and one end of the paper tube (86) away from the permanent magnet ring (83) is fixed at the edge of the speaker frame (81) through a rubber ring; the paper tube (86) is sleeved on the magnetic pole of the T-shaped metal magnetic pole (84).

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