CN211207577U

CN211207577U - Audio-visual projection arrangement is used in primary school's education

Info

Publication number: CN211207577U
Application number: CN202020275746.4U
Authority: CN
Inventors: 刘硕
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-09
Filing date: 2020-03-09
Publication date: 2020-08-07
Anticipated expiration: 2030-03-09

Abstract

The utility model discloses an audio-visual projection arrangement is used in primary school's education, include: the device comprises a storage box body, a controller, a lifting mechanism, an installation through hole and a sealing mechanism; the controller is arranged at the center of the front side of the containing box body; the lifting mechanism is arranged at the top end of the inner cavity of the containing box body; the mounting through hole is formed in the bottom end of the inner cavity of the containing box body, and the upper end and the lower end of the inner cavity of the mounting through hole are respectively communicated with the bottom end of the inner cavity of the containing box body and the lower surface of the containing box body; the sealing mechanism is arranged at the corresponding position of the bottom end of the containing box body and the mounting through hole. This audio-visual projection arrangement is used in primary school's education can realize projection arrangement's automation and accomodate the protection, avoids projection arrangement to expose externally, leads to its shell to adhere to a large amount of dusts, influences the heat dissipation to can realize the adjustment of projecting apparatus height, make things convenient for the teacher in time to clear up projection arrangement, prevent that the projecting apparatus heat dissipation is not smooth to lead to inside electrical part high temperature to damage, improve projection arrangement life.

Description

Audio-visual projection arrangement is used in primary school's education

Technical Field

The utility model relates to a teaching equipment technical field specifically is an audio-visual projection arrangement is used in primary school's education.

Background

Multimedia teaching means that in the teaching process, according to the characteristics of a teaching target and a teaching object, modern teaching media are reasonably selected and applied through teaching design and are organically combined with the traditional teaching means to jointly participate in the whole teaching process, and various media information acts on students to form a reasonable teaching process structure so as to achieve an optimized teaching effect;

in the prior art field, the present projecting apparatus for primary school's teaching adopts the naked fixed mounting of gallows in classroom top assigned position, because the classroom dust is great and the projecting apparatus position is higher, and then lead to the projecting apparatus surface often to be attached to a large amount of dusts, and be not convenient for clear up, and because the projecting apparatus can give off a large amount of heats in the course of the work, the dust attached to the surface influences the normal heat dissipation of projecting apparatus, and then lead to inside electrical part high temperature to damage, influence life.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an audio-visual projection arrangement is used in primary school's education to at least, the projection instrument face of solving among the prior art often adheres to a large amount of dusts, and is not convenient for clear up, and because the projecting apparatus can give off a large amount of heats in the course of the work, the dust that adheres to on the surface influences the projecting apparatus and normally dispels the heat, and then leads to inside electrical part high temperature to damage, influences life's problem.

In order to achieve the above object, the utility model provides a following technical scheme: an audio-visual projection device for primary education, comprising:

a storage box body;

a controller installed at a front center position of the storage case;

the lifting mechanism is arranged at the top end of the inner cavity of the containing box body;

the upper end and the lower end of the inner cavity of the mounting through hole are respectively communicated with the bottom end of the inner cavity of the containing box body and the lower surface of the containing box body;

and the sealing mechanism is arranged at the corresponding position of the bottom end of the containing box body and the mounting through hole.

Preferably, the lifting mechanism includes: the device comprises a base, a first guide rail, a first sliding block, a first mounting seat, a first supporting rod, a second mounting seat, a third mounting seat, a second supporting rod, a fourth mounting seat, a second sliding block, a bottom plate and a second guide rail; the base is arranged at the top end of the inner cavity of the containing box body along the left-right direction; the number of the first guide rails is two, and the two first guide rails are respectively arranged at the front end and the rear end of the right side of the bottom end of the base along the left-right direction; the number of the first sliding blocks is two, and the two first sliding blocks are respectively matched and sleeved on the right sides of the outer walls of the front and rear first guide rails; the number of the first installation seats is two, and the two first installation seats are respectively installed at the bottom ends of the front first sliding block and the rear first sliding block; the number of the first supporting rods is two, and one ends of the two first supporting rods are respectively and rotatably connected to the inner sides of the front first mounting seat and the rear first mounting seat through pin shafts; the number of the second mounting seats is two, and the two second mounting seats are respectively and rotatably connected to the other ends of the front and rear first supporting rods through pin shafts; the number of the third installation seats is two, and the two third installation seats are fixedly installed at the front end and the rear end of the left side of the bottom end of the base respectively; the number of the second supporting rods is two, one ends of the two second supporting rods are respectively and rotatably connected to the inner sides of the front and rear third mounting seats through pin shafts, the front and rear second supporting rods are respectively and crosswise arranged with the front and rear first supporting rods in an X shape, and the crossing positions are rotatably connected through pin shafts; the number of the fourth mounting seats is two, and the two fourth mounting seats are respectively and rotatably connected with the other ends of the front and rear second supporting rods through pin shafts; the number of the second sliding blocks is two, and the two second sliding blocks are respectively arranged at the bottom ends of the front and rear fourth mounting seats; the bottom plate is arranged at the bottom end of the second mounting seat along the left-right direction; the number of the second guide rails is two, the two second guide rails are arranged at the front end and the rear end of the right side of the top end of the bottom plate respectively in the left-right direction, and the area of the bottom plate is smaller than the cross section of the inner cavity of the mounting through hole.

Preferably, the lifting mechanism further comprises: the first motor, the lead screw and the lead screw nut; the first motor is arranged on the right side of the bottom end of the base along the left-right direction and is electrically connected with the controller; the screw rod is locked at the output end of the first motor through a coupler along the left and right directions; the screw nut is in threaded connection with the right side of the outer wall of the screw, and the front side and the rear side of the screw nut are fixedly connected with the inner sides of the front sliding block and the rear sliding block respectively through a support.

Preferably, the lifting mechanism further comprises: a gimbal and a projector; the universal frame is arranged at the center of the bottom end of the bottom plate along the vertical direction; the projector is arranged at the bottom end connecting end of the universal frame and locked.

Preferably, the closure mechanism comprises: the sealing mechanism comprises a sealing mechanism shell, a mounting groove, a limiting slide rail, a limiting slide block and a baffle plate; the sealing mechanism shell is arranged at the bottom end and the mounting through hole of the rear side of the containing box body along the left and right directions; the mounting groove is formed in the bottom end of the front side of the sealing mechanism shell in the left-right direction, and the front side and the rear side of an inner cavity of the mounting groove are communicated with the front side and the inner cavity of the sealing mechanism shell; the limiting slide rail is arranged on the front side of the bottom end of the mounting groove along the left-right direction; the number of the limiting sliding blocks is two, and the two limiting sliding blocks are respectively sleeved on the left side and the right side of the middle part of the outer wall of the limiting sliding rail; the number of the baffle plates is two, the baffle plates are arranged on the front side of the limiting slide block along the front-back direction respectively, and the baffle plates can seal the lower part of the inner cavity of the mounting through hole.

Preferably, the closing mechanism further comprises: the belt pulley, the transmission belt, the second motor and the connecting rod; the number of the belt pulleys is two, and the two belt pulleys are rotationally connected to the left side and the right side of the bottom end of the inner cavity of the shell of the sealing mechanism through pin shafts; the transmission belt is sleeved on the outer walls of the left belt pulley and the right belt pulley; the second motor is arranged on the right side of the top end of the inner cavity of the closed mechanism shell in the vertical direction, and the output end of the second motor is electrically connected with the controller through the screwed connection of the second motor and the top end of a belt pulley positioned on the right side of the inner cavity of the closed mechanism shell; the number of the connecting rods is two, the two connecting rods are respectively sleeved at the left end and the right end of the front side and the rear side of the transmission belt, and the left end and the right end of the front side and the right end of the rear side of the transmission belt are respectively fixedly connected with the rear sides of the left limiting slide block and the right limiting slide block.

Compared with the prior art, the beneficial effects of the utility model are that: the audio-visual projection device for primary education is characterized in that the right-side belt pulley is driven to rotate by the second motor, and then under the limiting tensioning effect of the left-side belt pulley, the transmission belt drives the left connecting rod and the right connecting rod on the front side and the back side of the transmission belt to respectively drive the limiting sliding blocks on the corresponding positions to move outwards, the left limiting sliding block and the right limiting sliding block drive the baffle plates on the corresponding positions to move outwards so as to relieve the bottom end of the inner cavity of the installation through hole, the controller controls the first motor to start and drive the lead screw to rotate, so that the lead screw nut drives the front first sliding block and the back first sliding block to drive the first installation seat on the corresponding positions to move towards the left under the rotating force effect of the lead screw and drives the top end of the first supporting rod to move towards the left, the first supporting rod rotates outwards by taking the rotating joint of, The second slider and the fourth mount pad all move downwards, the fourth mount pad drives the second bracing piece and moves to the left side, make the second bracing piece use with second bracing piece round pin axle rotation junction as the summit and rotate to the outside, and then make two second bracing pieces play around playing spacing and supporting role to the bottom plate decline in-process, and promote universal bracket and projecting apparatus under the cooperation of bottom plate and pass the inner chamber of installation through-hole downwards and move to appointed height, thereby can realize projecting apparatus's automatic protection of accomodating, avoid projecting apparatus to expose externally, lead to its shell to adhere to a large amount of dust, influence the heat dissipation, and can realize the adjustment of projecting apparatus height, make things convenient for the teacher to in time clear up projecting apparatus, prevent that the inside electrical part that leads to that the projecting apparatus heat dissipation is not smooth, improve projecting apparatus life.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of the lift mechanism of FIG. 1;

fig. 4 is an exploded view of the closure mechanism of fig. 1.

In the figure: 1. the storage box body, 2, a controller, 3, a lifting mechanism, 31, a base, 32, a first guide rail, 33, a first slider, 34, a first installation seat, 35, a first supporting rod, 36, a second installation seat, 37, a third installation seat, 38, a second supporting rod, 39, a fourth installation seat, 310, a second slider, 311, a second guide rail, 312, a first motor, 313, a lead screw, 314, a lead screw nut, 315, a bottom plate, 316, a universal frame, 317, a projector, 4, a sealing mechanism, 41, a sealing mechanism shell, 42, an installation groove, 43, a limiting slide rail, 44, a limiting slider, 45, a baffle, 46, a belt pulley, 47, a second motor, 48, a connecting rod, 49, a transmission belt, 5 and an installation through hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: an audio-visual projection device for primary education, comprising: the storage box body 1, the controller 2, the lifting mechanism 3, the mounting through hole 5 and the sealing mechanism 4 are arranged, and the mounting frame is arranged outside the box body 1 and can be fixed on the ceiling of a classroom; the controller 2 is installed at the center of the front side of the containing box body 1, the specific model of the controller 2 is directly purchased from the market and installed and used according to specific use requirements, and the controller 2 can be remotely connected with the teacher multimedia platform and remotely controlled to be started; the lifting mechanism 3 is arranged at the top end of the inner cavity of the containing box body 1; the mounting through hole 5 is formed in the bottom end of the inner cavity of the containing box body 1, and the upper end and the lower end of the inner cavity of the mounting through hole 5 are respectively communicated with the bottom end of the inner cavity of the containing box body 1 and the lower surface of the containing box body 1; the closing mechanism 4 is provided at a position corresponding to the mounting through hole 5 at the bottom end of the storage case 1.

Preferably, the lifting mechanism 3 further includes: the base 31, the first guide rail 32, the first slider 33, the first mounting seat 34, the first support bar 35, the second mounting seat 36, the third mounting seat 37, the second support bar 38, the fourth mounting seat 39, the second slider 310, the bottom plate 315 and the second guide rail 311; the base 31 is arranged at the top end of the inner cavity of the containing box body 1 along the left-right direction; the number of the first guide rails 32 is two, the two first guide rails 32 are respectively arranged at the front end and the rear end of the right side of the bottom end of the base 31 along the left-right direction, and the first guide rails 32 can limit the first sliding blocks 33; the number of the first sliding blocks 33 is two, and the two first sliding blocks 33 are respectively matched and sleeved on the right sides of the outer walls of the front and rear first guide rails 32; the number of the first installation seats 34 is two, the two first installation seats 34 are respectively installed at the bottom ends of the front and rear first sliding blocks 33, the first installation seats 34 drive the top ends of the first supporting rods 35 to move towards the left side in the process of moving towards the left side, the first supporting rods 35 rotate outwards by taking the pin shaft rotating connection positions with the second installation seats 36 as vertexes, the included angle between the second installation seats 34 and the upper surface of the bottom plate 315 is increased, and meanwhile, the front and rear first supporting rods 35 rotate towards the vertical direction from the inclination direction, and further the bottom plate 315 is pushed to move downwards; the number of the first supporting rods 35 is two, and one ends of the two first supporting rods 35 are respectively and rotatably connected to the inner sides of the front and rear first mounting seats 34 through pin shafts; the number of the second mounting seats 36 is two, and the two second mounting seats 36 are respectively and rotatably connected to the other ends of the front and rear first supporting rods 35 through pin shafts; the number of the third installation seats 37 is two, and the two third installation seats 37 are respectively and fixedly installed at the front end and the rear end of the left side of the bottom end of the base 31; the number of the second support rods 38 is two, one end of each of the two second support rods 38 is rotatably connected to the inner sides of the front and rear third mounting seats 37 through a pin, the front and rear second support rods 38 are respectively arranged in an X-shaped intersection with the front and rear first support rods 35 and the intersection position is rotatably connected through a pin, the bottom plate 315 drives the second guide rail 311, the second slider 310 and the fourth mounting seat 39 to move downwards in the downward movement process, the front and rear fourth mounting seats 39 respectively drive the front and rear second support rods 38 to move leftwards, so that the second support rods 38 rotate outwards with the pin rotation connection positions with the third mounting seats 37 as vertexes, the included angle between the second support rods 38 and the upper surface of the bottom plate 315 is increased, the front and rear second support rods 38 rotate vertically from an inclined position, and the front and rear second support rods 38 play a role in limiting and supporting the descending process of the bottom plate 315, the cross included angle between the first support rod 35 and the second support rod 38 is reduced, and simultaneously the universal frame 316 and the projector 317 are pushed to downwards penetrate through the inner cavity of the installation through hole 5 and move to a specified height under the cooperation of the bottom plate 315; the number of the fourth mounting seats 39 is two, and the two fourth mounting seats 39 are respectively and rotatably connected to the other ends of the front and rear second supporting rods 38 through pin shafts; the number of the second sliding blocks 310 is two, the two second sliding blocks 310 are respectively arranged at the bottom ends of the front and rear fourth mounting seats 39, and the second sliding blocks 310 can limit the fourth mounting seats 39; the bottom plate 315 is disposed at the bottom end of the second mounting seat 36 in the left-right direction; the number of the second guide rails 311 is two, the two second guide rails 311 are respectively arranged at the front end and the rear end of the right side of the top end of the bottom plate 315 along the left-right direction, and the area of the bottom plate 315 is smaller than the cross section of the inner cavity of the installation through hole 5.

Preferably, the lifting mechanism 3 further includes: a first motor 312, a lead screw 313 and a lead screw nut 314; the first motor 312 is installed on the right side of the bottom end of the base 31 along the left-right direction, the first motor 312 is a stepping motor, the first motor 312 is electrically connected with the controller 2, the specific usage model of the first motor 312 is directly purchased from the market and installed and used according to specific requirements, the screw 313 can be driven to rotate clockwise, and the screw nut 314 is driven to move towards the left side by the front first sliding block 33 and the rear first sliding block 33 under the rotating force of the screw 313; the lead screw 313 is locked at the output end of the first motor 312 through a coupler along the left-right direction; the screw nut 314 is screwed on the right side of the outer wall of the screw 313, and the front side and the rear side of the screw nut 314 are respectively fixedly connected with the inner sides of the front first sliding block 33 and the rear first sliding block 33 through the brackets.

Preferably, further, the gimbal 316 and the projector 317; the gimbal 316 is arranged at the center of the bottom end of the bottom plate 315 in the vertical direction, so that the irradiation angle of the projector 317 can be adjusted conveniently, and the applicability of the device is improved; the projector 317 is installed at the bottom end connection end of the gimbal 316 and locked, and the projector 317 is directly purchased from the market and installed and used according to the specific model.

Preferably, the closing mechanism 4 further comprises: a sealing mechanism shell 41, a mounting groove 42, a limiting slide rail 43, a limiting slide block 44 and a baffle 45; the closing mechanism housing 41 is arranged at the bottom end of the rear side of the storage box body 1 and the mounting through hole 5 along the left-right direction; the mounting groove 42 is arranged at the bottom end of the front side of the sealing mechanism shell 41 along the left-right direction, and the front side and the rear side of the inner cavity of the mounting groove 42 are communicated with the front side and the inner cavity of the sealing mechanism shell 41; the limiting slide rail 43 is arranged on the front side of the bottom end of the mounting groove 42 in the left-right direction, and the limiting slide rail 43 can limit the limiting slide block 44; the number of the limiting slide blocks 44 is two, and the two limiting slide blocks 44 are respectively sleeved on the left side and the right side of the middle part of the outer wall of the limiting slide rail 43; the quantity of baffle 45 is two, and two baffles 45 set up in limit slide 44 front side along the fore-and-aft direction respectively, and two baffles 45 of controlling can seal the inner chamber below of installation through-hole 5, and the mountable sealing strip in the top of baffle 45 prevents that the dust from getting into in order to improve containing box 1 internal tightness.

Preferably, the closing mechanism 4 further includes: a belt pulley 46, a transmission belt 49, a second motor 47 and a connecting rod 48; the number of the belt pulleys 46 is two, and the two belt pulleys 46 are rotatably connected to the left side and the right side of the bottom end of the inner cavity of the sealing mechanism shell 41 through pin shafts; the transmission belt 49 is sleeved on the outer walls of the left belt pulley 46 and the right belt pulley 46, and the left belt pulley 46 plays a role in limiting and tensioning the transmission belt 49; the second motor 47 is arranged on the right side of the top end of the inner cavity of the sealing mechanism shell 41 in the vertical direction, the output end of the second motor 47 is in threaded connection with the top end of the belt pulley 46 positioned on the right side of the inner cavity of the sealing mechanism shell 41, the second motor 47 is electrically connected with the controller 2, the second motor 47 is a stepping motor, the second motor 47 is directly purchased and installed from the market according to specific use requirements in use model, and the second motor 47 drives the belt pulley 46 on the right side of the inner cavity of the sealing mechanism shell 41 to rotate anticlockwise; the number of the connecting rods 48 is two, the two connecting rods 48 are respectively sleeved at the left end and the right end of the front side and the rear side of the transmission belt 49, the front sides of the left connecting rod 48 and the right connecting rod 48 are respectively fixedly connected with the rear sides of the left limiting slide block 44 and the right limiting slide block 44, so that the transmission belt 49 is enabled to rotate in the process, and the left connecting rod 48 and the right connecting rod 48 on the front side and the rear side of the transmission belt are.

All the electrical components in the present application can be connected with an externally adapted power supply through a wire, and an adapted external controller should be selected to connect according to a specific actual use condition to meet a control requirement for all the electrical components, and a specific connection manner and a control sequence thereof should be referred to in the following working principle, in which the electrical components are electrically connected in sequence, a detailed connection means thereof is a known technology in the art and is not described, and a working principle and a working process thereof are mainly described below).

When the device is used, a teacher can remotely control the controller 2 to start, so that the controller 2 controls the second motor 47 to start, the second motor 47 drives the right belt pulley 46 in the inner cavity of the enclosure mechanism 41 to rotate anticlockwise, the left and right belt pulleys 46 are in transmission connection through the transmission belt 49, and further under the limiting and tensioning action of the left belt pulley 46, the transmission belt 49 rotates anticlockwise, and drives the left and right connecting rods 48 on the front and back sides of the device to move outwards respectively, and under the limiting action of the limiting slide rail 43, the left and right connecting rods 48 drive the limiting slide blocks 44 on corresponding positions to move outwards respectively, and the left and right limiting slide blocks 44 drive the baffle plates 45 on corresponding positions to move outwards so as to remove the sealing of the bottom end of the inner cavity of the installation through hole 5, the controller 2 controls the first motor 312 to start to drive the screw rod 313 to rotate clockwise, and as the, the screw nut 314 is driven by the rotating force of the screw 313 to move the front and rear first sliding blocks 33 to the left, and the limiting action of the front and rear first guide rails 32 drives the first mounting seats 34 at the corresponding positions to move to the left, because the inner sides of the first mounting seats 34 are rotatably connected with the top ends of the first supporting rods 35 through the pin shafts, and the bottom ends of the first supporting rods 35 are rotatably connected with the second mounting seats 36 through the pin shafts, the top ends of the first supporting rods 35 are driven to move to the left when the first mounting seats 34 move to the left, the first supporting rods 35 rotate to the outside with the pin shafts rotatably connected with the second mounting seats 36 as vertexes, an included angle between the second mounting seats 34 and the upper surface of the bottom plate 315 is increased, and meanwhile, the front and rear first supporting rods 35 rotate from an inclined direction to a vertical direction to further push the bottom plate 315 to move downwards, and the bottom plate 315 drives the second guide rails 311 to move downwards when moving downwards, The second sliding block 310 and the fourth mounting seat 39 both move downwards, because the upper and lower ends of the second supporting rod 38 are respectively connected with the third mounting seat 37 and the fourth mounting seat 39 through the pin shafts, and further under the limiting action of the second sliding block 310, the front and rear fourth mounting seats 39 respectively drive the front and rear second supporting rods 38 to move towards the left, so that the second supporting rod 38 rotates outwards with the pin shaft rotating connection with the third mounting seat 37 as the vertex, and the included angle between the second supporting rod 38 and the upper surface of the bottom plate 315 is increased, at the same time, the front and rear second supporting rods 38 rotate from the inclined direction to the vertical direction, and further the front and rear second supporting rods 38 play the role of limiting and supporting in the descending process of the bottom plate 315, and because the front and rear two first supporting rods 35 are respectively arranged between the front and rear second supporting rods 38 and the intersection is connected through the pin shafts, promote between first bracing piece 35 and the second bracing piece 38 when the intersection contained angle diminishes to promote universal 316 and projecting apparatus 317 to pass the inner chamber of installation through-hole 5 downwards and remove to appointed height under the cooperation of bottom plate 315, thereby can realize projecting apparatus's automation and accomodate the protection, avoid projecting apparatus to expose externally, lead to its shell to adhere to a large amount of dusts, influence the heat dissipation, and can realize the adjustment of projecting apparatus height, make things convenient for the teacher in time to clear up projecting apparatus, prevent that the unsmooth inside electrical part high temperature damage that leads to of projecting apparatus heat dissipation, improve projecting apparatus life.

In the description of the present invention, it is to be understood that the terms "top end", "bottom end", "one end", "front side", "rear side", "other end", "upper", "lower", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated; also, unless expressly stated or limited otherwise, the terms "mounted," "screwed," "plugged," "interference fit," "disposed," and the like are to be construed broadly, e.g., as a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An audio-visual projection device for primary education, comprising:

a storage box body (1);

a controller (2) mounted at the front center of the storage box (1);

the lifting mechanism (3) is arranged at the top end of the inner cavity of the containing box body (1);

the mounting through hole (5) is formed in the bottom end of the inner cavity of the containing box body (1), and the upper end and the lower end of the inner cavity of the mounting through hole (5) are respectively communicated with the bottom end of the inner cavity of the containing box body (1) and the lower surface of the containing box body (1);

and the closing mechanism (4) is arranged at the corresponding position of the bottom end of the containing box body (1) and the installation through hole (5).

2. The audio-visual projection device for primary school education according to claim 1, wherein: the lifting mechanism (3) comprises:

the base (31) is arranged at the top end of the inner cavity of the containing box body (1) along the left-right direction;

the number of the first guide rails (32) is two, and the two first guide rails (32) are respectively arranged at the front end and the rear end of the right side of the bottom end of the base (31) along the left-right direction;

the number of the first sliding blocks (33) is two, and the two first sliding blocks (33) are respectively matched and sleeved on the right sides of the outer walls of the front first guide rail and the rear first guide rail (32);

the number of the first installation seats (34) is two, and the two first installation seats (34) are respectively installed at the bottom ends of the front first sliding block (33) and the rear first sliding block (33);

the number of the first supporting rods (35) is two, and one end of each of the two first supporting rods (35) is rotatably connected to the inner sides of the front first mounting seat (34) and the rear first mounting seat (34) through a pin shaft;

the number of the second installation seats (36) is two, and the two second installation seats (36) are respectively and rotatably connected to the other ends of the front and rear first supporting rods (35) through pin shafts;

the number of the third installation seats (37) is two, and the two third installation seats (37) are fixedly installed at the front end and the rear end of the left side of the bottom end of the base (31) respectively;

the number of the second supporting rods (38) is two, one end of each of the two second supporting rods (38) is rotatably connected to the inner sides of the front third mounting seat and the rear third mounting seat (37) through a pin shaft, the front second supporting rod and the rear second supporting rod (38) are respectively arranged in an X-shaped cross mode with the front first supporting rod and the rear first supporting rod (35) and are rotatably connected at the cross positions through pin shafts;

the number of the fourth mounting seats (39) is two, and the two fourth mounting seats (39) are respectively and rotatably connected to the other ends of the front and rear second supporting rods (38) through pin shafts;

the number of the second sliding blocks (310) is two, and the two second sliding blocks (310) are respectively arranged at the bottom ends of the front fourth mounting seat and the rear fourth mounting seat (39);

a bottom plate (315) disposed at a bottom end of the second mounting seat (36) in a left-right direction;

the number of the second guide rails (311) is two, the second guide rails (311) are respectively arranged at the front end and the rear end of the right side of the top end of the bottom plate (315) in the left-right direction, and the area of the bottom plate (315) is smaller than the cross section of the inner cavity of the mounting through hole (5).

3. The audio-visual projection device for primary school education according to claim 2, wherein: the lifting mechanism (3) further comprises:

the first motor (312) is installed on the right side of the bottom end of the base (31) along the left-right direction, and the first motor (312) is electrically connected with the controller (2);

the lead screw (313) is locked at the output end of the first motor (312) through a coupling along the left-right direction;

the screw nut (314) is screwed on the right side of the outer wall of the screw (313), and the front side and the rear side of the screw nut (314) are respectively fixedly connected with the inner sides of the front first sliding block (33) and the rear first sliding block (33) through a support.

4. The audio-visual projection device for primary school education according to claim 2, wherein: the lifting mechanism (3) further comprises:

a gimbal (316) disposed at a bottom center of the bottom plate (315) in an up-down direction;

and the projector (317) is arranged at the bottom end connecting end of the universal frame (316) and locked.

5. The audio-visual projection device for primary school education according to claim 1, wherein: the closure mechanism (4) comprises:

a closing mechanism housing (41) which is arranged at the bottom end of the rear side of the storage box body (1) and the mounting through hole (5) along the left-right direction;

the mounting groove (42) is formed in the bottom end of the front side of the sealing mechanism shell (41) in the left-right direction, and the front side and the rear side of an inner cavity of the mounting groove (42) are communicated with the front side and the inner cavity of the sealing mechanism shell (41);

the limiting slide rail (43) is arranged on the front side of the bottom end of the mounting groove (42) along the left-right direction;

the number of the limiting sliding blocks (44) is two, and the two limiting sliding blocks (44) are respectively sleeved on the left side and the right side of the middle part of the outer wall of the limiting sliding rail (43);

baffle (45), the quantity of baffle (45) is two, two baffle (45) set up in spacing slider (44) front side along the fore-and-aft direction respectively, control two baffle (45) can seal the inner chamber below of installation through-hole (5).

6. The audio-visual projection device for primary school education according to claim 5, wherein: the closure mechanism (4) further comprises:

the number of the belt pulleys (46) is two, and the two belt pulleys (46) are rotatably connected to the left side and the right side of the bottom end of the inner cavity of the sealing mechanism shell (41) through pin shafts;

the transmission belt (49) is sleeved on the outer walls of the left belt pulley (46) and the right belt pulley (46);

the second motor (47) is arranged on the right side of the top end of the inner cavity of the closed mechanism shell (41) in the vertical direction, the output end of the second motor (47) is connected with the top end of a belt pulley (46) located on the right side of the inner cavity of the closed mechanism shell (41) through a screw joint, and the second motor (47) is electrically connected with the controller (2);

the connecting rods (48), the quantity of connecting rods (48) is two, two connecting rods (48) cup joint respectively in both ends about the front and back both sides of driving belt (49), control two the front side of connecting rod (48) respectively with control two limit slide block (44) rear side fixed connection.