Lifting, folding and hiding multifunctional mobile audio-video device with telescopic projection curtain

Abstract

The utility model relates to the field of audio equipment, in particular to a lifting, folding and hiding multifunctional mobile audio-video device with a telescopic projection curtain, which is characterized by comprising a mobile sound equipment body, a lifting driving mechanism, a folding projection screen and a projector, the mobile sound equipment body is provided with a positioning cavity and a storage cavity, and the lifting driving mechanism is arranged in the storage cavity. The folding projection screen is arranged in the storage cavity in a folding mode, and the projector is arranged in the positioning cavity. According to the utility model, a common user can quickly obtain a good projection effect, and the adjustment time can be greatly shortened, so that great convenience is brought to the use of the user; the normal projection function can be realized without the assistance of other accessories, and the projector can be used in more places; the projection is less interfered by the outside, so that the video information can be more stably output, and a lot of troubles can be solved for users; in addition, the folding projection screen can be stored conveniently, and the stored folding screen can be well protected.

Description

Technical Field

[0001] The utility model relates to the field of audio equipment, in particular to a mobile audio-visual device. Background Art

[0002] At present, there are many mobile audio equipment with projection function. On such mobile audio equipment, projection cloth and projector are now used to realize the projection function. Among them, the projection cloth can be folded and set on the mobile audio equipment, and the projector is an independent electrical appliance. When the projection function is needed, first unfold the projection cloth; then place the projector at a suitable position in front of the projection cloth, and make the projection direction of the projector face the projection cloth; then turn on the projector; then adjust the projector to make the projection image quality at a high quality.

[0003] Since most users have limited experience in placing and adjusting projectors, the process of adjusting the projector generally involves: adjusting the front, back, left, right, up, and down positions, adjusting the tilt angle, adjusting the screen display area, adjusting the projection angle, adjusting the focal length, etc. This will cause the projector adjustment process to take a lot of time, which brings great inconvenience to the user. In addition, independently placed projectors generally require an auxiliary platform to support the projector, which not only requires the purchase or search for an auxiliary platform, but also limits the applicable places of mobile audio equipment. In addition, independently placed projectors are not only prone to bumps and damage, but also prone to the projection screen being disturbed by human activities, which can easily affect the playback of related video information, which causes considerable trouble for users. At the same time, the projection cloth on existing mobile audio equipment is also inconvenient to fold and store.

[0004] Therefore, it is very necessary to design a multifunctional mobile audio-visual device with a telescopic projection screen that can be lifted, folded and hidden to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to solve the above-mentioned problems and shortcomings, and to provide a multifunctional mobile audio-visual device with a retractable projection screen that can be lifted, folded and hidden, which can help ordinary users quickly obtain good projection effects, and can greatly shorten the adjustment time, thereby bringing great convenience to users; it can achieve normal projection functions without the assistance of other accessories, and can be used in more places; its projection is less affected by external interference, so that it can output video information more stably, thereby solving many problems for users; and the storage of the foldable projection screen is not only very convenient, but also can provide good protection for the stored foldable screen.

[0006] The technical solution of the utility model is achieved in this way:

[0007] A multifunctional mobile audio-visual device with a retractable projection screen for lifting, folding and hiding, which is characterized by comprising a mobile audio body, a lifting drive mechanism, a folding projection screen, and a projector. The top of the mobile audio body is respectively provided with a positioning cavity and a storage cavity at the front and rear. The lifting drive mechanism is arranged in the storage cavity. The folding projection screen is folded and arranged in the storage cavity, and the folding projection screen is connected to the lifting end of the lifting drive mechanism. The lifting drive mechanism can also push the folding projection screen out of the storage cavity, and the folding projection screen can be unfolded outside the storage cavity. The projector is arranged in the positioning cavity, and the projector can project onto the folding projection screen unfolded outside the storage cavity.

[0008] Preferably, the folding projection screen is an automatic folding projection screen.

[0009] Preferably, the folding projection screen is a folding projection screen whose left and right ends can be folded towards the middle.

[0010] Preferably, the folding projection screen comprises a left screen, a middle screen, and a right screen. The middle screen is arranged on the lifting end of the lifting drive mechanism. The left screen and the right screen are respectively hinged to the left and right ends of the middle screen in a horizontally rotatable manner. A left rotation drive mechanism for driving the left screen to rotate is arranged between the left screen and the middle screen, and a right rotation drive mechanism for driving the right screen to rotate is arranged between the right screen and the middle screen.

[0011] Preferably, a shielding cover that can be opened and closed is arranged at the opening of the positioning cavity.

[0012] Preferably, a horizontally extending transmission belt is arranged in the positioning cavity. The shielding cover comprises two cover plates, and the two cover plates are arranged at the opening of the positioning cavity in a horizontally slidable manner, and the two cover plates are respectively connected to the two ends of the transmission belt moving in opposite directions.

[0013] Preferably, the lifting drive mechanism is a vertically arranged electric telescopic push rod.

[0014] Preferably, a battery is arranged on the mobile audio body.

[0015] Preferably, the mobile audio body comprises a mobile box body and at least one speaker. The positioning cavity and the storage cavity are respectively arranged at the front and rear ends of the top of the mobile box body. A lower inner cavity is arranged at the lower front end of the mobile box body. At least one installation opening penetrating through to the lower inner cavity is arranged on the lower front wall of the mobile box body. The number of the installation openings is equal to the number of the speakers, and the speakers are arranged on the installation openings.

[0016] Preferably, a touch screen that inclines backward is arranged on the front wall of the mobile box body.

[0017] Advantages of the present utility model: On this mobile audio-visual device, by providing a positioning cavity and a storage cavity on the mobile audio body, and respectively arranging the projector and the folding projection screen in the positioning cavity and the storage cavity, and enabling the projector to project onto the folding projection screen unfolded outside the storage cavity, this can stably maintain the projector and the folding projection screen in a normal relative position, eliminating the need for the user to perform relevant adjustment operations, facilitating ordinary users to quickly obtain a good projection effect, greatly shortening the adjustment time, and thus bringing great convenience to the user. Moreover, it can achieve normal projection function without the assistance of other accessories and can be used in more places. Since both the projector and the folding projection screen are located on the mobile audio body, and the positioning cavity can provide a certain degree of protection for the projector, this can not only greatly reduce the probability of the projector being bumped, but also significantly reduce the probability of people moving between the projector and the folding projection screen, thereby reducing the probability of the projection screen being interfered by people's activities, enabling more stable output of video information, and thus solving many troubles for the user. By providing a storage cavity to store the folding projection screen and using a lifting drive mechanism to move the folding projection screen in and out of the storage cavity, this can not only improve the convenience, stability and accuracy of storing the folding projection screen, but also use the storage cavity to provide a certain degree of shielding protection for the folding projection screen to reduce the probability of damage to the folding projection screen during transportation; moreover, using the storage cavity to store the folding projection screen can also help reduce the overall volume and height of the mobile audio-visual device, facilitating storage, movement and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic cross-sectional structure view of the mobile audio-visual device in the present utility model.

[0019] Figure 2 is a schematic structure view of the mobile audio-visual device in the folded state in the present utility model.

[0020] Figure 3 is a schematic structure view of the mobile audio-visual device during the folding or unfolding process in the present utility model.

[0021] Figure 4 is one of the schematic structure views of the mobile audio-visual device in the unfolded state in the present utility model.

[0022] Figure 5 is another schematic structure view of the mobile audio-visual device in the unfolded state in the present utility model.

[0023] Figure 6 For the present utility model Figure 5 is an enlarged schematic structure view of part A in the present utility model.

[0024] Figure 7 For the present utility model Figure 5 is an enlarged schematic structure view of part B in the present utility model.

[0025] Figure 8 This is a schematic structural view of the assembled state of the shielding cover and the transmission belt in the present utility model. Specific embodiments

[0026] As Figures 1 to 5 shown, a multifunctional mobile audio-visual device with a telescopic projection screen for lifting, folding, and hiding according to the present utility model includes a mobile audio body 1, a lifting drive mechanism 2, a folding projection screen 3, and a projector 4. Positioning cavities 10 and storage cavities 20 are respectively formed at the front and rear of the top of the mobile audio body 1. The lifting drive mechanism 2 is disposed in the storage cavity 20. The folding projection screen 3 is folded and arranged in the storage cavity 20, and the folding projection screen 3 is connected to the lifting end of the lifting drive mechanism 2. The lifting drive mechanism 2 can push the folding projection screen 3 out of the storage cavity 20, and the folding projection screen 3 can be unfolded outside the storage cavity 20. The projector 4 is disposed in the positioning cavity 10, and the projector 4 can project onto the folding projection screen 3 unfolded outside the storage cavity 20.

[0027] On this mobile audio-visual device, by forming the positioning cavity 10 and the storage cavity 20 on the mobile audio body 1, and respectively disposing the projector 4 and the folding projection screen 3 in the positioning cavity 10 and the storage cavity 20, and enabling the projector 4 to project onto the folding projection screen 3 unfolded outside the storage cavity 20, the projector 4 and the folding projection screen 3 can be stably maintained in a normal relative position, eliminating the need for the user to perform relevant adjustment operations. This is beneficial for ordinary users to quickly obtain a good projection effect, greatly shortening the adjustment time and bringing great convenience to the user. Moreover, it can achieve a normal projection function without the assistance of other accessories and can be used in more places. Since both the projector 4 and the folding projection screen 3 are located on the mobile audio body 1, and the positioning cavity 10 can provide a certain degree of protection for the projector 4, this can not only greatly reduce the probability of the projector 4 being bumped, but also greatly reduce the probability of people moving between the projector 4 and the folding projection screen 3, thereby reducing the probability of the projection screen being interfered by people's activities and enabling more stable output of video information, thus solving many problems for the user. By forming the storage cavity 20 to store the folding projection screen 3 and using the lifting drive mechanism 2 to move the folding projection screen 3 in and out of the storage cavity 20, this can not only improve the convenience, stability, and accuracy of storing the folding projection screen 3, but also use the storage cavity 20 to provide a certain degree of shielding protection for the folding projection screen 3 to reduce the probability of damage to the folding projection screen 3 during transportation. Moreover, using the storage cavity 20 to store the folding projection screen 3 can also help reduce the overall volume and height of the mobile audio-visual device, facilitating storage, movement, and transportation.

[0028] The positioning cavity 10 can accurately position the relative height position of the projector 4 and the unfolded folding projection screen 3, and the positioning cavity 10 confines the projector 4 within a relatively small range, so the amount that the user needs to adjust will be very small, which greatly reduces the convenience of use for the user.

[0029] During use, the relative position of the projector 4 and the folding projection screen 3 is stable, so the projected image will also be very stable, which is conducive to achieving high-quality video output.

[0030] During the actual manufacturing process, the projector 4 can be further positioned using the following structures: First, the projector 4 can be fixed to the bottom of the positioning cavity 10; Second, the positioning cavity 10 is made to match the projector 4 to confine the projector 4 at an accurate position through the positioning cavity 10; Third, the projector 4 is accurately adsorbed at a suitable position in the positioning cavity 10 by magnetic attraction; This can further reduce the amount of adjustment of the projector 4, thereby further improving the convenience of use.

[0031] When the projector 4 is working, the image projected by the projector 4 can pass through the opening of the positioning cavity 10 and be projected onto the unfolded folding projection screen 3, which can well meet the actual use requirements.

[0032] As Figures 3 to 5 shown, the folding projection screen 3 is an automatic folding projection screen. This can improve the convenience and accuracy of folding the folding projection screen 3, thereby helping to improve the convenience and reliability of use.

[0033] As Figures 3 to 5 shown, the folding projection screen 3 is a folding projection screen whose left and right ends can fold towards the middle. This can reduce the amount of lateral space occupied after the folding projection screen 3 is folded, so there is no need to manufacture a storage cavity 20 with a large lateral length to store the folding projection screen 3, which is conducive to manufacturing a mobile audio-visual device with a small space occupancy, which is convenient for packaging, storage, and transportation. And this can also make the unfolded folding projection screen 3 have a large-width image, which is conducive to obtaining a better projection effect, and thus conducive to improving the applicability of the mobile audio-visual device.

[0034] As Figures 3 to 5As shown in the figure, the folding projection screen 3 includes a left screen 31, a middle screen 32, and a right screen 33. The middle screen 32 is provided at the lifting end of the lifting drive mechanism 2. The left screen 31 and the right screen 33 are respectively hinged to the left and right ends of the middle screen 32 so as to be horizontally rotatable. A left rotation drive mechanism 34 for driving the left screen 31 to rotate is provided between the left screen 31 and the middle screen 32, and a right rotation drive mechanism 35 for driving the right screen 33 to rotate is provided between the right screen 33 and the middle screen 32. In this way, the requirements for automatically folding and unfolding the folding projection screen 3 can be achieved, which is beneficial to improving the convenience, accuracy, and stability of folding and unfolding, and further contributes to improving the convenience of using the mobile audio-visual device.

[0035] As Figures 5 to 7 shown in the figure, the left screen 31 is hinged to the middle screen 32 through a left hinge 36, and the right screen 33 is hinged to the middle screen 32 through a right hinge 37. Both the left rotation drive mechanism 34 and the right rotation drive mechanism 35 are drive motors. The left rotation drive mechanism 34 is fixed on the middle screen 32, and the power output shaft of the left rotation drive mechanism 34 is connected to the left screen 31. The rotation center line of the power output shaft of the left rotation drive mechanism 34 is coaxial with the hinge center line of the left hinge 36. The right rotation drive mechanism 35 is fixed on the middle screen 32, and the power output shaft of the right rotation drive mechanism 35 is connected to the right screen 33. The rotation center line of the power output shaft of the right rotation drive mechanism 35 is coaxial with the hinge center line of the right hinge 37. In this way, the folding projection screen 3 can have a very stable and reliable structure, which can ensure that the mobile audio-visual device has very high reliability and applicability.

[0036] As Figures 5 to 7 shown in the figure, in the actual manufacturing process, a curtain or a screen can be used to form the left screen 31, the middle screen 32, or the right screen 33. When the left screen 31 and the right screen 33 are unfolded, the left screen 31, the middle screen 32, and the right screen 33 can form a projection screen. When using a curtain, a frame 301 is used as the base frame, and the curtain 302 is fixedly attached to the frame 301, so as to form a reliable left screen 31, middle screen 32, or right screen 33. Wherein, the end parts of the left hinge 36 and the right hinge 37 are respectively fixed on the corresponding frame 301, and the left rotation drive mechanism 34 and the right rotation drive mechanism 35 are also respectively fixed on the corresponding frame 301, so as to meet the actual use requirements.

[0037] As Figure 1 、 Figure 5 And Figure 7As shown, vertical guide slots 303 extending vertically are respectively formed on the left and right side walls of the frame 301 of the middle screen 32. Guide blocks 201 are respectively arranged on the left and right cavity walls of the storage cavity 20. The guide slots 303 on the left and right sides are respectively slidably clamped on the left and right guide blocks 201. This can greatly improve the accuracy and stability of the vertical movement of the folding projection screen 3, thereby helping to further improve the reliability and applicability of the mobile audio-visual device.

[0038] As Figure 1 , Figure 5 and Figure 7 shown, the lower end of the frame 301 of the middle screen 32 protrudes beyond the left screen 31 and the right screen 33. This can enable the unfolded folding projection screen 3 to be restricted by the guide blocks 201 as well, so that the unfolded state of the folding projection screen 3 can be maintained in a very stable state, thereby helping to improve the reliability and applicability of the mobile audio-visual device.

[0039] The projector 4 is a short-throw projector. In this way, there is no need to make the mobile audio-visual device too large to meet the projection requirements of the projector 4, which can facilitate the manufacture of a small-sized mobile audio-visual device, and this can facilitate packaging, storage, and transportation.

[0040] The projector 4 can also adopt an ultra-short-throw projector, which can facilitate the manufacture of an even smaller-sized mobile audio-visual device, thereby further improving the convenience of packaging, storage, and transportation.

[0041] As Figure 2 and Figure 3 shown, a shielding cover 5 that can be opened and closed is arranged at the opening of the positioning cavity 10. When the projector 4 is not in use, the shielding cover 5 can be used to shield and protect the projector 4 to prevent the projector 4 from being soiled or damaged and affecting the projection effect.

[0042] The shielding cover 5 can either be hinged to the opening of the positioning cavity 10 through a hinge to achieve flipping opening and closing, or the shielding cover 5 can be slidably arranged at the opening of the positioning cavity 10 to achieve sliding opening and closing, so as to meet the opening and closing requirements of the shielding cover 5.

[0043] As Figure 2 , Figure 3 and Figure 8As shown, the positioning cavity 10 is provided with a transmission belt 6 extending transversely, and the shielding cover 5 includes two cover plates 51, which can be arranged on the cavity opening of the positioning cavity 10 in a transverse sliding manner, and the two cover plates 51 are respectively connected to the two ends of the transmission belt 6 in opposite directions of movement. The shielding cover 5 is formed by using two cover plates 51, and when the positioning cavity 10 adopts a large cavity opening, the two cover plates 51 can be used to cover the left and right cavity openings of the positioning cavity 10 respectively, and the two cover plates 51 can be opened in both directions, so that there is no need to reserve a large accommodating space on one side of the positioning cavity 10 for the shielding cover 5 to be stored, so that a small-volume mobile audio-visual device can be manufactured. In addition, by moving any one of the cover plates 51, the other cover plate 51 can be moved, and the moving directions of the two cover plates 51 are opposite, so that the two cover plates 51 can be opened and closed at the same time, which helps to improve the convenience of use.

[0044] like Figure 8 As shown, the left and right ends of the transmission belt 6 are limited on the cavity wall of the positioning cavity 10 by pulleys 61, and one of the pulleys 61 is driven by a driving motor 62. This can not only meet the requirement of stable installation of the transmission belt 6, but also meet the requirement of automatic opening and closing of the shielding cover 5, thereby improving the reliability of the structure and the convenience of use.

[0045] like Figure 8 As shown, a transversely extending T-shaped slot 101 is provided on the inner wall of the positioning cavity 10, and the middle of the T-shaped slot 101 is located on the cavity opening of the positioning cavity 10, and two cover plates 51 are respectively slidably embedded on the left and right ends of the T-shaped slot 101. In this way, the cover plates 51 can be accurately and stably defined, thereby facilitating the improvement of the sliding accuracy and stability of the cover plates 51.

[0046] like Figure 1 As shown, the lifting drive mechanism 2 is a vertically arranged electric telescopic push rod, which can make the lifting drive mechanism 2 have a very simple and reliable structure, thereby being able to stably meet the needs of actual use, thereby ensuring that the mobile audio-visual device has high reliability and applicability.

[0047] like Figure 1 As shown, the mobile audio body 1 is provided with a battery 7. In this way, the mobile audio and video device can be used in places where mains power is difficult to obtain, thereby helping to increase the scope of application of the mobile audio and video device.

[0048] like Figure 1 and Figure 2As shown, the mobile audio body 1 includes a mobile box body 11 and at least one speaker 12. The positioning cavity 10 and the storage cavity 20 are respectively opened at the front and rear ends of the top of the mobile box body 11. An inner lower cavity 111 is opened at the lower front end of the mobile box body 11. At least one installation opening 112 penetrating into the inner lower cavity 111 is opened on the lower front wall of the mobile box body 11. The number of the installation openings 112 is equal to the number of the speakers 12, and the speakers 12 are arranged on the installation openings 112. Such a mobile audio body 1 is very simple and reliable, which not only facilitates manufacturing but also ensures very good audio effects.

[0049] As Figure 2 shown, a plurality of universal wheels 13 with brakes are arranged at the bottom of the mobile box body 11, which can not only meet the need for movement but also stably place the mobile box body 11 in various occasions, thus improving the safety of use.

[0050] As Figures 2 to 4 shown, a touch screen 8 inclined backward is arranged on the front wall of the mobile box body 11. The arrangement of the touch screen 8 facilitates the user to perform relevant setting operations, and the backward-inclined touch screen 8 is convenient for the user to view and operate, thus helping to further improve the convenience of use of the mobile audio-visual device.

[0051] As Figures 2 to 4 shown, an inclined surface 14 inclined backward is arranged at the front top corner of the mobile box body 11, and the touch screen 8 is arranged on the inclined surface 14. This can not only facilitate the inclined installation of the touch screen 8 but also make the mobile audio-visual device have a very coordinated structure, thus better meeting the actual use requirements.

[0052] As Figure 2 shown, in the actual manufacturing process, relevant electrical plug-in interfaces 15 can be arranged on the mobile box body 11 so that other relevant devices (such as mobile phones, computers, tablets, etc.) can be connected to the mobile audio-visual device, thus enabling the mobile audio-visual device to meet more usage requirements.

[0053] As Figure 1 And Figure 2 shown, a convex ring opening 202 is formed by the upward protrusion of the cavity opening of the storage cavity 20. This can increase the storage space of the storage cavity 20 without increasing the overall size of the mobile audio body 1, thus facilitating the storage of a tall folding projection screen and further facilitating the mobile audio-visual device to have a very good projection effect.

[0054] As Figures 1 to 4As shown, an installation cavity 203 is formed by extending forward the lower end of the storage cavity 20. The battery 7 is disposed in the installation cavity 203. The battery 7 supplies power to the lifting drive mechanism 2, the speaker 12, the projector 4, the touch screen 8, the drive motor 62, the left rotation drive mechanism 34 and the right rotation drive mechanism 35. In this mobile audio-visual device, the circuit structure for realizing the projection and audio functions directly adopts the existing structure, so as to meet the requirements of actual manufacturing and use.

[0055] The above embodiments are the preferred embodiments of the present invention. All structures similar to the present invention and equivalent changes made thereto shall fall within the protection scope of the present invention.

Claims

1. A multifunctional mobile audio-visual device with a retractable projection screen that can be lifted, folded and hidden, characterized in that: The invention comprises a mobile audio body (1), a lifting drive mechanism (2), a folding projection screen (3), and a projector (4), wherein a positioning cavity (10) and a storage cavity (20) are respectively provided at the front and rear of the top of the mobile audio body (1), the lifting drive mechanism (2) is arranged in the storage cavity (20), the folding projection screen (3) is folded and arranged in the storage cavity (20), and the folding projection screen (3) is connected to the lifting end of the lifting drive mechanism (2), and the lifting drive mechanism (2) can push the folding projection screen (3) out of the storage cavity (20), and the folding projection screen (3) can be unfolded outside the storage cavity (20), and the projector (4) is arranged in the positioning cavity (10), and the projector (4) can project onto the folding projection screen (3) unfolded outside the storage cavity (20).

2. According to claim 1, the multifunctional mobile audio-visual device with a retractable projection screen that can be lifted, folded and hidden is characterized by: The folding projection screen (3) is an automatic folding projection screen.

3. The multifunctional mobile audio-visual device with a retractable projection screen that can be lifted, folded and hidden according to claim 1, characterized in that: The folding projection screen (3) is a folding projection screen whose left and right ends can be folded toward the middle.

4. The multifunctional mobile audio-visual device with a retractable projection screen that can be lifted, folded and hidden according to claim 1, 2 or 3, characterized in that: The folding projection screen (3) comprises a left screen (31), a middle screen (32), and a right screen (33); the middle screen (32) is arranged on the lifting end of the lifting drive mechanism (2); the left screen (31) and the right screen (33) are respectively hinged on the left and right ends of the middle screen (32) so as to be horizontally rotatable; a left rotation drive mechanism (34) for driving the left screen (31) to rotate is arranged between the left screen (31) and the middle screen (32); and a right rotation drive mechanism (35) for driving the right screen (33) to rotate is arranged between the right screen (33) and the middle screen (32).

5. According to claim 1, the multifunctional mobile audio-visual device with a retractable projection screen that can be lifted, folded and hidden is characterized by: An opening and closing shielding cover (5) is provided on the cavity opening of the positioning cavity (10).

6. The multifunctional mobile audio-visual device with a retractable projection screen that can be lifted, folded and hidden according to claim 5, characterized in that: A transversely extending transmission belt (6) is arranged in the positioning cavity (10), and the shielding cover (5) comprises two cover plates (51). The two cover plates (51) are arranged on the cavity opening of the positioning cavity (10) in a transversely slidable manner, and the two cover plates (51) are respectively connected to two ends of the transmission belt (6) in opposite moving directions.

7. The multifunctional mobile audio-visual device with a retractable projection screen that can be lifted, folded and hidden according to claim 1, characterized in that: The lifting drive mechanism (2) is a vertically arranged electric telescopic push rod.

8. The multifunctional mobile audio-visual device with a retractable projection screen that can be lifted, folded and hidden according to claim 1, characterized in that: The mobile audio body (1) is provided with a battery (7).

9. The multifunctional mobile audio-visual device with a retractable projection screen that can be lifted, folded and hidden according to claim 1, characterized in that: The mobile audio body (1) comprises a mobile box (11) and at least one speaker (12); the positioning cavity (10) and the storage cavity (20) are respectively arranged on the front and rear ends of the top of the mobile box (11); a lower inner cavity (111) is arranged on the front lower end of the mobile box (11); at least one mounting opening (112) penetrating into the lower inner cavity (111) is arranged on the lower front wall of the mobile box (11); the number of the mounting openings (112) is equal to the number of the speakers (12); and the speakers (12) are arranged on the mounting openings (112).

10. The multifunctional mobile audio-visual device with a retractable projection screen that can be lifted, folded and hidden according to claim 9, characterized in that: A touch screen (8) tilted backwards is provided on the front wall of the mobile box (11).

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