CN110944252B

CN110944252B - Foldable sound system

Info

Publication number: CN110944252B
Application number: CN201911309693.1A
Authority: CN
Inventors: 庹斌
Original assignee: Xiamen Lingrui Intelligent Technology Co ltd
Current assignee: Xiamen Lingrui Intelligent Technology Co ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2022-03-08
Anticipated expiration: 2039-12-18
Also published as: CN110944252A

Abstract

A foldable sound system comprises a sound amplifying device, an upper support unit, an upper shell, a movement main body, an underframe unit and a lower shell; the upper bracket unit comprises two support arms, a transmission mechanism and a first driving unit; each support arm comprises a connecting arm and a gear plate; the two public address equipment are respectively fixedly connected with the free ends of the two connecting arms; the gear plate is rotationally and fixedly connected to one side of the machine core main body, and a plurality of gear teeth are arranged on the periphery of the free end of the gear plate; the two gear plates are respectively distributed on two opposite sides of the transmission mechanism, the transmission mechanism is provided with a tooth part, the gear teeth are meshed with the tooth part, and the gear plates are rotatably arranged through the gear teeth and the tooth part; the first driving unit drives the transmission mechanism to rotate; the underframe unit comprises two supports and a control module, and the control module can control the two supports to be unfolded or folded. The invention can conveniently and quickly realize the folding and unfolding of the two public address devices.

Description

Foldable sound system

Technical Field

The invention relates to the technical field of sound, in particular to a foldable sound system.

Background

In a busy metropolitan life, people must face many challenges and stresses every day to keep people in a tight state every day, most people relax their mind and body in order to relieve the stress or to free themselves, and therefore listening to music has become one of the best methods for relieving stress for most people.

Sound box equipment is used in occasions such as conferences and stage performances at present. In practical applications, people mount required sound boxes on a support, which is usually a fixed and immovable support, but with the diversification of entertainment forms, various new requirements have been generated.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, the technical problems in the above-described techniques. To this end, it is an object of the present invention to provide a foldable sound system.

In order to achieve the above object, a first aspect of the present invention provides a foldable sound system, including a sound amplifying device, an upper support unit, an upper casing, a movement body, a bottom frame unit, and a lower casing; the upper bracket unit comprises two support arms, a transmission mechanism and a first driving unit; each support arm comprises a connecting arm and a gear plate which are connected with each other; the two public address equipment are respectively fixedly connected with the free ends of the two connecting arms; the gear plate is rotationally and fixedly connected to one side of the machine core main body, and a plurality of gear teeth are arranged on the periphery of the free end of the gear plate; the machine core main body, the two gear plates, the transmission mechanism and the first driving unit are all accommodated in the upper shell; the two gear plates are respectively distributed on two opposite sides of the transmission mechanism, the transmission mechanism is provided with a tooth part, the gear teeth are meshed with the tooth part, and the gear plates are rotatably arranged through the gear teeth and the tooth part; the first driving unit drives the transmission mechanism to rotate; the chassis unit comprises two supports and a control module, the control module can control the two supports to be unfolded or folded, and the control module is located in the lower shell.

Based on the design, when the first driving unit drives the transmission mechanism to rotate, under the action of the meshed gear teeth and the tooth parts, the transmission mechanism rotates, the two gear plates rotate anticlockwise or clockwise, the connecting arm and the public address equipment are unfolded (or folded) outwards, and the distance between the two public address equipment is extended (or folded); under the action of the control module, the two brackets can be automatically opened or closed.

In addition, the foldable sound system proposed by the above embodiment of the present invention may further have the following additional technical features:

the transmission mechanism comprises a lifting rod and a first screw rod, the inner wall of the lifting rod is provided with threads, and the tooth parts are two rows of second teeth which are vertically arranged on the left side and the right side of the outer wall of the lifting rod; the lifting rod is sleeved on the first screw rod and is rotationally connected with the first screw rod through the threads; each row of second teeth are meshed with teeth of a gear plate; the first driving unit drives the first screw to rotate. The first screw rod rotates under the action of the first driving unit, the lifting rod rises or falls upwards, the two gear plates rotate clockwise or anticlockwise, and the connecting arm and the public address equipment are folded or unfolded downwards.

The upper bracket unit also comprises a limiting mechanism, the limiting mechanism comprises a limiting plate, an infrared transmitter and two infrared receivers, and the limiting plate is arranged vertically and corresponds to a gear plate; the infrared transmitter is arranged on a gear plate corresponding to the limiting plate, the two infrared receivers are arranged at the top and the bottom of the limiting plate respectively, the infrared transmitter and the two infrared receivers are arranged correspondingly, and the infrared transmitter and the two infrared receivers are connected with the first motor.

The transmission mechanism is a worm, the tooth part is spiral teeth arranged on the worm, and the gear teeth of the two gear plates are respectively meshed with the spiral teeth and symmetrically distributed on two sides of the worm; the driving unit drives the worm to rotate. When the loudspeaker is in work, the gear teeth of the two gear plates rotate along the spiral teeth of the worm to move upwards or downwards, so that the distance of the two loudspeaker devices is opened or the two loudspeaker devices are folded.

The control module comprises a main body assembly, a lifting adjusting assembly and a second driving unit; the main body assembly comprises two base bodies which are symmetrical to each other, the inner side surface of each base body is provided with a longitudinal groove, and the longitudinal grooves of the two base bodies form an accommodating groove in an enclosing manner; the lifting adjusting assembly comprises a second screw and a nut sliding block; the nut sliding block is internally provided with a threaded deep hole and a positioning groove, the threaded deep hole is positioned at the middle upper part of the nut sliding block, the positioning groove is positioned at the lower part of the nut sliding block, and the bottom end and the opposite two side surfaces of the positioning groove are both of an opening structure; the second screw is screwed in the threaded deep hole of the nut sliding block, and the nut sliding block can move up and down in the accommodating groove; the second driving unit drives the second screw to rotate; every the equal rigid coupling in top of support has a metal card, the metal card rotationally the rigid coupling in two base main parts, and this metal card has a flange end, and the flange end of two metal cards all inserts the constant head tank to rotationally the rigid coupling is in the constant head tank. The metal card can rotate up and down along with the lifting of the nut slide block, thereby driving the bracket to be opened or folded.

The bottom of the accommodating groove extends outwards to form a fan-shaped groove, and a limit stop is further arranged at the center of the bottom of the accommodating groove; when the two brackets are opened or folded, the two metal clamping pieces move in the fan-shaped groove and are clamped on the inner top of the fan-shaped groove or the limit stop. The main body component can wrap the metal card, so that the integral stability and the external appearance are ensured, and the implementation of the function is not influenced.

Two limiting holes are correspondingly formed in the middle parts of two opposite side walls of the nut sliding block, and the two limiting holes are communicated with the threaded deep hole; control module still includes two sets of limit switch units, every the limit switch unit all includes a limit switch and a limit switch briquetting, limit switch locates on the nut slider, the limit switch briquetting corresponds the setting of the spacing hole department of nut slider, limit switch is connected with the limit switch briquetting electricity, just limit switch control limit switch briquetting card is gone into or is left spacing hole, so can realize the fixed of nut slider position and release.

The multimedia support comprises a sliding block seat, at least one guide rod, an external module and a base; the sliding block seat is provided with at least one sliding hole which penetrates through the sliding block seat from front to back, the guide rod penetrates through the sliding hole, and the lower end of the guide rod is fixed on the base; the upper end and the lower end of the inner wall of the sliding hole are respectively sunken inwards to form two mounting grooves, a friction piece is mounted in each mounting groove, and the friction piece is tightly sleeved on the guide rod; the external module is rotationally connected with or fixed on the sliding block seat; the base is fixedly connected to the upper shell. The friction piece makes external module can be fast, firmly centre gripping on the guide arm, adopts this structure can reduce the use of fastener to reduce the operating procedure of user when using, improve user's work efficiency, the user drags the take-up housing through the length direction along the guide arm simultaneously, and then can adjust external module's front and back position.

The lower part of the friction piece is provided with an outward-expanded bulge which is nested in the mounting groove, and the top end of the friction piece extends out of the sliding hole; the inner side surface of the friction piece is in interference fit with the outer surface of the guide rod, so that the sliding block seat can be stably clamped on the outer surface of the guide rod through the friction piece; .

The middle part of the sliding block seat is provided with a hinge groove; the external module is a support rod, one end of the support rod is a hinged end, the other end of the support rod is provided with a clamping part which can be used for clamping multimedia equipment, the external module is rotatably hinged on the sliding block seat through the hinged end, and therefore a user can adjust the upper position and the lower position of the external module.

Drawings

Fig. 1 is an overall view of a foldable sound system according to the present invention.

Fig. 2 is a schematic structural diagram of a first upper bracket unit according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of the chassis unit according to the present invention.

Fig. 4 is an enlarged view at C in fig. 3.

Fig. 5 is a schematic structural view of the nut slider and the metal card of the present invention.

Fig. 6 is a schematic structural view of the nut slider according to the present invention.

Fig. 7 is a schematic structural diagram of a multimedia stand according to the present invention.

Fig. 8 is a second schematic structural diagram of the multimedia stand according to the present invention.

Fig. 9 is a schematic structural diagram of a first upper bracket unit according to the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Referring to fig. 1-2, a foldable sound system 100 includes a sound equipment 1, an upper frame unit 2, an upper housing 3, a movement body 4, a bottom frame unit 5, a lower housing 6 and a multimedia frame 7; the upper bracket unit 2 comprises two support arms 21, a transmission mechanism 22, a first driving unit 23 and a limiting mechanism 24; each of the support arms 21 includes a connection arm 211 and a gear plate 212 connected to each other; the two sound amplifying devices 1 are fixedly connected with the free ends of the two connecting arms 211 respectively, and the sound amplifying devices 1 are sound boxes; the gear plate 212 is rotatably fixed on one side of the movement body 4, and a plurality of gear teeth 212a are arranged on the periphery of the free end of the gear plate 212; the movement body 4 includes a movement a and a movement B, a first rotation axis 213 passes through one side of the movement a, the gear plate 212 and a corresponding side of the movement B from front to back in sequence, and the movement a, the gear plate 212 and the movement B are fastened and connected through a fastening piece 8, and the gear plate 212 can rotate relative to the first rotation axis 213, so that the gear plate 212 can be fixed on the movement body 4, and meanwhile, the gear plate 212 can rotate in the vertical direction relative to the first rotation axis 213. The movement body 4, the two gear plates 212, the transmission mechanism 22 and the first driving unit 23 are all accommodated in the upper shell 3; the two gear plates 212 are respectively distributed on two opposite sides of the transmission mechanism 22, the transmission mechanism 22 is provided with a tooth part d, the gear teeth 212a are meshed with the tooth part d, and the gear plates 212 are rotatably arranged through the gear teeth 212a and the tooth part d; the first driving unit 23 drives the transmission mechanism 22 to rotate.

Referring to fig. 2 again, in the present embodiment, the transmission mechanism 22 includes a lifting rod 221 and a first screw 222, the inner wall of the lifting rod 221 is provided with threads, and the tooth portion d is two rows of second teeth 2211 vertically disposed on the left and right sides of the outer wall of the lifting rod 221; the lifting rod 221 is sleeved on the first screw 222 and is rotatably connected with the first screw 222 through the thread; each row of the second teeth 2211 is engaged with the teeth 212a of one gear plate 212; the first driving unit 23 drives the first screw 222 to rotate. The first driving unit 23 includes a first motor 231 and a speed reducer 232, the first motor 231 is drivingly connected to the speed reducer 232, and the speed reducer 232 is drivingly connected to the first screw 222, such that the first motor 231 can sequentially drive the speed reducer 232 and the first screw 222 to rotate. The limiting mechanism 24 includes a limiting plate 241, an infrared emitter (not shown) and two infrared receivers 242, and the limiting plate 241 is disposed vertically and corresponding to a gear plate 212; the infrared transmitter is arranged on a gear plate 212 corresponding to the limiting plate 241, the infrared receiver 242 is arranged at the top and the bottom of the limiting plate 241 respectively, the infrared transmitter and the two infrared receivers 242 are arranged correspondingly, and the infrared transmitter and the two infrared receivers 242 are connected with the first motor 231. When the lifting rod 221 moves downward or upward until the infrared emitter at the upper portion thereof emits infrared light upward in alignment with the infrared receiver 242 at the bottom or top of the position restriction plate 241, the lifting rod 221 moves downward or upward to a proper position, and the first motor 231 stops rotating. When the public address equipment 1 needs to be used, the first motor 231 drives the reducer 232 to rotate, the reducer 232 drives the first screw 222 to rotate, the lifting rod 221 moves downwards while the first screw 222 rotates, the two gear plates 212 rotate anticlockwise under the action of the meshed gear teeth 212a and the second gear teeth 2211, the connecting arm 211 and the public address equipment 1 are opened outwards, the distance between the two public address equipment 1 is shortened, and the two public address equipment 1 can be used; in a similar way, the first screw 222 rotates under the action of the first motor 231 and the reducer 232, the lifting rod 221 rises upwards, the two gear plates 212 rotate clockwise, and the connecting arm 211 and the audio amplifier 1 are folded downwards, i.e. the two audio amplifiers 1 are folded.

Referring to fig. 3-4, the base frame unit 5 includes two brackets 51 and a control module 52, the brackets 51 include legs 511 and a base frame 512, and the legs 511 and the base frame 512 are fixedly or movably connected. The control module 52 can control the two brackets 51 to be arranged in an opening or closing manner, and the control module 52 is located in the lower shell 6. The control module 52 comprises a main body assembly 521, a lifting adjusting assembly 522 and a second driving unit 523; the main body component 521 includes two base main bodies 5211 that are symmetrical to each other, a longitudinal groove 524 is formed on the inner side surface of each base main body 5211, and the longitudinal grooves 524 of the two base main bodies 5211 enclose to form an accommodating groove K; the elevation adjustment assembly 522 includes a second screw 5221 and a nut runner 5222; the nut block 5222 is preferably rectangular, a threaded deep hole 5222a and a positioning groove 5222b are formed in the nut block 5222, the threaded deep hole 5222a is located at the middle upper part of the nut block 5222, the positioning groove 5222b is located at the lower part of the nut block 5222, and the bottom end and the opposite two side surfaces of the positioning groove 5222b are both open structures; the second screw 5221 is screwed in the threaded deep hole 5222a of the nut slider 5222, and the nut slider 5222 can move up and down in the accommodating groove K; the second driving unit 523 drives the second screw 5221 to rotate, the second driving unit 523 comprises a second motor 5231 and a speed change gear box 5232, the second motor 5231, the speed change gear box 5232 and the second screw 5221 are sequentially in driving connection, and the second screw 5221 is controlled to rotate so as to drive the nut sliding block 5222 to move up and down;

referring to fig. 4-6, a metal card 53 is fixedly connected to the top end of each of the brackets 51, the metal card 53 is rotatably connected to the two base main bodies 5211, the metal card 53 has a flange end 531, the flange ends 531 of the two metal cards 53 are inserted into the positioning grooves 5222b and are rotatably connected to the positioning grooves 5222b, that is, the two metal cards 53 are rotatably connected to the positioning grooves 5222b through the positioning pins 9. The bottom of the accommodating groove K extends outwards to form a fan-shaped groove d, and a limit stop K1 is further arranged at the center of the bottom of the accommodating groove K; when the two brackets 51 are opened or folded, the two metal cards 53 move in the fan-shaped groove d and are held on the inner top of the fan-shaped groove d or the limit stop K1. When the second screw 5221 drives the nut block 5222 to move up and down through the screw rotation, the two metal locking pieces 53 rotate up and down within the range of the fan-shaped groove d along with the lifting of the nut block 5222 by using the pin 10 as a rotating shaft, thereby driving the bracket 51 to open or fold. Two limit holes 5222c are correspondingly formed in the middle parts of two opposite side walls of the nut sliding block 5222, and the two limit holes 5222c are communicated with the threaded deep hole 5222 a; the control module 52 further includes two sets of limit switch units 525, each limit switch unit 525 includes a limit switch 5251 and a limit switch pressing block 5252, the limit switch 5251 is disposed on the nut sliding block 5222, the limit switch pressing block 5252 is disposed corresponding to the limit hole 5222c of the nut sliding block 5222, the limit switch 5251 is electrically connected with the limit switch pressing block 5252, and the limit switch 5251 controls the limit switch pressing block 5252 to be clamped into or separated from the limit hole 5222c, so as to fix and release the position of the nut sliding block 5222. The limit switch 5251 is pressed against the second screw 5221 by electrically controlling a plug 5252f in the limit switch block 5252 according to the position information to ensure that the nut block 5222 does not slip accidentally in the open or closed state.

Referring to fig. 3-4 again, when working, the second motor 5231 drives the speed change gear box 5232 to control the second screw 5221 extending into the threaded deep hole 5222a to rotate, and the second screw 5221 drives the nut block 5222 to move downward or upward, so that the positioning pin 9 moves downward or upward, and simultaneously drives the metal card 53 to move downward or upward together while rotating, so that the metal card 53 rotates around the pin shaft 10 and tends to be in a transversely opened or closed state, thereby driving the bracket 51 to be in a transversely opened or closed state; when the metal card 53 abuts against the upper side of the fan-shaped groove d, the bracket 51 is set to be in a final open state, and the limit switch 5251 controls the plug pin 5252f in the limit switch pressing block 5252 to penetrate through the limit hole 5222c to further fix the second screw 5221, so that the stability of the open state is ensured; when the two metal clips 53 abut against the two sides of the limit stop k1, the limit switch 5251 controls the plug pin 5252f in the limit switch pressing block 5252 to pass through the limit hole 5222c to fix the second screw rod 5221, so as to ensure the stability of the folded state, in order to finally fold and close the bracket 51.

Referring to fig. 7-8, the multimedia stand 7 includes a slider seat 71, at least one guide rod 72, an external module 73 and a base 74; the slide block seat 71 is provided with at least one slide hole 711 which penetrates through the front and the back, the guide rod 72 penetrates through the slide hole 711, and the lower end of the guide rod 72 is fixed on the base 74; the number of the guide rods 72 is preferably two, and the number of the sliding holes 711 is two; the upper end and the lower end of the inner wall of the sliding hole 711 are respectively recessed inwards to form two mounting grooves 712, a friction piece 75 is mounted in each mounting groove 712, and the friction piece 75 is tightly sleeved on the guide rod 72; the external module 73 is rotatably connected or fixed on the sliding block seat 71; the base 74 is fixed to the upper case 3. The lower part of the friction member 75 is provided with an expanded projection 751, the projection 751 is nested in the mounting groove 712, the top end of the friction member 75 extends out of the sliding hole 711, the friction member 75 is an elastic member, the aperture of the friction member 75 is smaller than the diameter of the guide rod 72, so that the friction member 75 is in interference fit with the guide rod 72, and the sliding block seat 71 can be firmly clamped on the outer surface of the guide rod 72 through the friction member 75; the user can adjust the front and rear positions of the external module 73 by dragging the slider holder 71 along the length direction of the guide rod 72. The middle part of the slider seat 71 is provided with a hinge groove 713; the external module 73 is a support rod, one end of the support rod is a hinged end 731, the other end of the support rod is provided with a clamping part 732 which can be used for clamping multimedia equipment, and the external module 73 is rotatably hinged on the slider seat 71 through the hinged end 731.

Example 2

This part differs from example 1 in that:

referring to fig. 2 and 9 again, the transmission mechanism 22 is a worm 223, the tooth portion d is a spiral tooth 2231 disposed on the worm 223, and the gear teeth 212a of the two gear plates 212 are respectively engaged with the spiral tooth 2231 and symmetrically distributed on two sides of the worm 223; the first driving unit 23 drives the worm 223 to rotate.

Referring to fig. 9, when the present invention is applied to work, the first motor 231 drives the reducer 232 to rotate, the reducer 232 drives the worm 223 to rotate, and the worm 223 rotates, and simultaneously, the gear teeth 212a of the two gear plates 212 rotate upward or downward along the spiral teeth 2231 of the worm 223, and under the action of the engaged gear teeth 212a and the spiral teeth 2231, the two gear plates 212 rotate counterclockwise or clockwise, and the connecting arm 211 and the audio amplifier 1 are opened or closed outward, so as to realize the opening and closing of the two audio amplifier 1.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A foldable sound system (100), characterized by: comprises a public address equipment (1), an upper bracket unit (2), an upper shell (3), a movement main body (4), a chassis unit (5) and a lower shell (6); the upper support unit (2) comprises two support arms (21), a transmission mechanism (22) and a first driving unit (23); each of the support arms (21) includes a connection arm (211) and a gear plate (212) connected to each other; the two public address equipment (1) are correspondingly and fixedly connected with the free ends of the two connecting arms (211); the gear plate (212) is rotatably and fixedly connected to one side of the machine core main body (4), and a plurality of gear teeth (212a) are arranged on the periphery of the free end of the gear plate (212); the movement main body (4), the two gear plates (212), the transmission mechanism (22) and the first driving unit (23) are all accommodated in the upper shell (3); the two gear plates (212) are arranged on two opposite sides of the transmission mechanism (22), the transmission mechanism (22) is provided with a tooth part (d), the gear teeth (212a) are meshed with the tooth part (d), and the gear plates (212) rotate through the gear teeth (212a) and the tooth part (d); the first driving unit (23) drives the transmission mechanism (22) to rotate; the chassis unit (5) comprises two brackets (51) and a control module (52), the control module (52) can control the two brackets (51) to open or close, and the control module (52) is positioned in the lower shell (6);

the control module (52) comprises a main body component (521), a lifting adjusting component (522) and a second driving unit (523); the main body component (521) comprises two base main bodies (5211) which are symmetrical to each other, the inner side surface of each base main body (5211) is provided with a longitudinal groove (524), and the longitudinal grooves (524) of the two base main bodies (5211) enclose to form an accommodating groove (K); the lifting adjustment assembly (522) comprises a second screw (5221) and a nut slider (5222); the nut sliding block (5222) is internally provided with a threaded deep hole (5222a) and a positioning groove (5222b), the threaded deep hole (5222a) is positioned at the middle upper part of the nut sliding block (5222), the positioning groove (5222b) is positioned at the lower part of the nut sliding block (5222), and the bottom end and the opposite two side surfaces of the positioning groove (5222b) are both of an open structure; the second screw (5221) is in threaded connection with a threaded deep hole (5222a) of the nut sliding block (5222), and the nut sliding block (5222) can move up and down in the accommodating groove (K); the second driving unit (523) drives the second screw (5221) to rotate; every the top of support (51) all is rigid coupling has a metal card (53), metal card (53) rotationally rigid coupling in two base main parts (5211), and this metal card (53) have a flange end (531), and flange end (531) of two metal cards (53) all insert constant head tank (5222b) to rotationally the rigid coupling is in constant head tank (5222 b).

2. A foldable sound system (100) according to claim 1, wherein: the transmission mechanism (22) comprises a lifting rod (221) and a first screw (222), the inner wall of the lifting rod (221) is provided with threads, and the tooth part (d) is two rows of second tooth teeth (2211) vertically arranged on the outer walls of the left side and the right side of the lifting rod (221); the lifting rod (221) is sleeved on the first screw rod (222) and is rotationally connected with the first screw rod (222) through the threads; each row of the second teeth (2211) is meshed with the teeth (212a) of a gear plate (212); the first driving unit (23) drives the first screw (222) to rotate.

3. A foldable sound system (100) according to claim 1, wherein: the transmission mechanism (22) is a worm (43), the tooth part (d) is a spiral tooth (431) arranged on the worm (43), and the gear teeth (212a) of the two gear plates (212) are respectively meshed with the spiral tooth (431) and symmetrically arranged on two sides of the worm (43); the first driving unit (23) drives the worm (43) to rotate.

4. A foldable sound system (100) according to claim 1, wherein: the first drive unit (23) comprises a first motor (231); the upper support unit (2) further comprises a limiting mechanism (24), the limiting mechanism (24) comprises a limiting plate (241), an infrared emitter and two infrared receivers (242), and the limiting plate (241) is vertically arranged and corresponds to a gear plate (212); the infrared transmitter is arranged on a gear plate (212) corresponding to the limiting plate (241), the infrared receiver (242) is arranged at the top and the bottom of the limiting plate (241) respectively, the infrared transmitter and the two infrared receivers (242) are arranged correspondingly, and the infrared transmitter and the two infrared receivers (242) are connected with the first motor (231).

5. A foldable sound system (100) according to claim 1, wherein: the bottom of the accommodating groove (K) extends outwards to form a fan-shaped groove, and a limit stop (K1) is arranged at the center of the bottom of the accommodating groove (K); when the two brackets (51) are opened or folded, the two metal cards (53) move in the fan-shaped groove and are clamped on the inner top of the fan-shaped groove or a limit stop (K1).

6. A foldable sound system (100) according to claim 1, wherein: the middle parts of two opposite side walls of the nut sliding block (5222) are respectively provided with a limiting hole (5222c), the two limiting holes (5222c) are correspondingly arranged, and the two limiting holes (5222c) are communicated with the threaded deep hole (5222 a); the control module (52) further comprises two limit switch units (525), each limit switch unit (525) comprises a limit switch (5251) and a limit switch pressing block (5252), the limit switch (5251) is arranged on the nut sliding block (5222), the limit switch pressing block (5252) is arranged corresponding to a limit hole (5222c) of the nut sliding block (5222), the limit switch (5251) is electrically connected with the limit switch pressing block (5252), and the limit switch (5251) controls the limit switch pressing block (5252) to be clamped into or separated from the limit hole (5222 c).

7. A foldable sound system (100) according to claim 1, wherein: the multimedia support (7) comprises a slider seat (71), at least one guide rod (72), an external module (73) and a base (74); the sliding block seat (71) is provided with at least one sliding hole (711) which penetrates through the sliding block seat from front to back, the guide rod (72) penetrates through the sliding hole (711), and the lower end of the guide rod (72) is fixed on the base (74); the inner walls of the upper end and the lower end of the sliding hole (711) are respectively sunken inwards to form two mounting grooves (712), a friction piece (75) is mounted in each mounting groove (712), and the friction piece (75) is tightly sleeved on the guide rod (72); the external module (73) is rotationally connected or fixed on the sliding block seat (71); the base (74) is fixedly connected to the upper shell (3).

8. A foldable sound system (100) according to claim 7, wherein: the bottom of the friction piece (75) is provided with an outward-expanding protrusion (751), the protrusion (751) is nested in the mounting groove (712), and the top of the friction piece (75) extends out of the sliding hole (711).

9. A foldable sound system (100) according to claim 7, wherein: the middle part of the sliding block seat (71) is provided with a hinge groove (713); the external module (73) is a support rod, one end of the support rod is a hinged end (731), the other end of the support rod is provided with a clamping part (732) which can be used for clamping multimedia equipment, and the external module (73) can be rotatably arranged on the sliding block seat (71) through the hinged end.