CN112205824A

CN112205824A - Display device based on Internet of things

Info

Publication number: CN112205824A
Application number: CN202011096894.0A
Authority: CN
Inventors: 孙亚明
Original assignee: Shaoxing Lanca Intelligent Technology Co Ltd
Current assignee: Shaoxing Lanca Intelligent Technology Co Ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-01-12

Abstract

The invention relates to the technical field of display of the Internet of things and discloses display equipment based on the Internet of things, which comprises a box body, wherein a lower cavity and an upper cavity are arranged in the box body, supporting legs and rollers are fixedly installed at the bottom of the box body, a display box is fixedly installed at the top of the box body, a driving mechanism is installed in the upper cavity, the driving mechanism comprises a first rotating shaft, the top of the inner wall of the lower cavity and the bottom of the inner wall are fixedly connected with a first bearing, and the upper end and the lower end of the first rotating shaft are rotatably connected with the first bearing. According to the invention, the supporting legs and the rollers are arranged at the bottom of the box body, and the supporting legs can be folded, so that the rollers can be conveniently contacted with the ground, the equipment can be conveniently moved, the rollers can be lifted by the hydraulic push rod, the rollers can be contracted, the equipment can be conveniently placed on a desktop, and when the supporting legs are not folded, the equipment can be placed on the ground, so that the use is convenient.

Description

Display device based on Internet of things

Technical Field

The invention relates to the technical field of display of the Internet of things, in particular to display equipment based on the Internet of things.

Background

The exhibition of the Internet of things is a huge industry exhibition. The intelligent household intelligent management system relates to an upstream, middle and downstream industrial chain of industries such as intelligent cities, intelligent agriculture, intelligent industry, intelligent medical treatment, intelligent communities, intelligent parking lots and intelligent homes. The Internet of Things (IOT) is a centralized exhibition of The concept of The Internet of Things in China at present, and means that any object or process needing monitoring, connection and interaction is collected in real time through various devices and technologies such as various information sensors, radio frequency identification technologies, global positioning systems, infrared sensors, laser scanners and The like, various needed information such as sound, light, heat, electricity, mechanics, chemistry, biology, positions and The like is collected, and The ubiquitous connection of objects and objects, and objects and people is realized through various possible network accesses, so that The intelligent sensing, identification and management of The objects and The process are realized. The internet of things is an information bearer based on the internet, a traditional telecommunication network and the like, and all common physical objects which can be independently addressed form an interconnected network.

The existing display equipment is single in form and generally only comprises a display box and a display product.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides display equipment based on the Internet of things, and aims to solve the problems in the background technology.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a display device based on the Internet of things comprises a box body, wherein a lower cavity and an upper cavity are arranged inside the box body, supporting legs and rollers are fixedly mounted at the bottom of the box body, a display box is fixedly mounted at the top of the box body, a driving mechanism is mounted inside the upper cavity and comprises a first rotating shaft, a first bearing is fixedly connected to the top of the inner wall and the bottom of the inner wall of the lower cavity, the upper end and the lower end of the first rotating shaft are rotatably connected with the first bearing, the top of the first rotating shaft penetrates into the display box, a clamping mechanism is mounted inside the display box and comprises a rotating disc, the bottom of the rotating disc is fixedly connected with the top of the first rotating shaft, a second camera is fixedly connected to the middle of the top of the inner wall of the display box, illuminating lamps are fixedly connected to the two sides of the second camera at the top of the inner wall of the display box, and a, the projection mechanism comprises a movable groove, the movable groove is arranged at the top of the display box, and a projector is arranged inside the movable groove.

Preferably, the top of supporting leg is articulated with the bottom of box, the knob is installed in the bottom of box to one side at the supporting leg top, open at the top of supporting leg has the through-hole that matches with the knob, the one end of knob is pegged graft with the through-hole at supporting leg top, open bottom one side of supporting leg has the metal slot, the bottom fixedly connected with magnet of box, the position of metal slot is the same when the position of magnet and supporting leg are folding.

Preferably, the top of the roller is provided with a roller groove at the bottom of the box body, the top of the inner wall of the roller groove is provided with a hydraulic push rod groove, the inside of the hydraulic push rod groove is fixedly connected with a first hydraulic push rod, the bottom of the first hydraulic push rod is fixedly connected with the top of the roller, and the rollers at the bottom of the box body are provided with four groups.

Preferably, the left side of pivot one is equipped with pivot two, the inner wall top and the inner wall bottom fixedly connected with bearing two of cavity are under at the upper and lower both ends of pivot two, pivot two rotates with bearing two to be connected, the equal fixedly connected with belt pulley in middle part of pivot one and pivot two, two connect through belt transmission between the belt pulley, the inner wall bottom fixedly connected with motor of cavity down, the left side of motor and the equal fixedly connected with helical gear in middle part of pivot two, two helical gear intermeshing, cavity inner wall right side fixedly connected with camera one down, the right side inner wall bottom fixedly connected with transmitter one of cavity down.

Preferably, the inside mounting of carousel has two clamp splices, two fixedly connected with hydraulic push rod two, two between the inner wall side of clamp splice and carousel the bottom fixedly connected with stopper of clamp splice, open the side of carousel has spacing hole, stopper and spacing hole sliding connection.

Preferably, the bottom of the inner wall of the upper cavity is fixedly connected with a humidifier and a dehumidifier, and the bottom of the display box is provided with air holes.

Preferably, the top cap is installed at the top of activity groove, the upper right corner fixedly connected with transmitter two of show case, hydraulic pressure push rod three is installed to the bottom of projecting apparatus, install the connecting rod between hydraulic pressure push rod three and the bottom of projecting apparatus, the top of connecting rod is articulated with the projecting apparatus, the bottom of connecting rod is articulated with hydraulic pressure push rod three's one end.

Preferably, an air exhaust channel is formed in the left side of the top of the display box, and an exhaust fan is fixedly connected inside the air exhaust channel.

Compared with the prior art, the invention provides the display equipment based on the Internet of things, which has the following beneficial effects:

1. according to the invention, the supporting legs and the rollers are arranged at the bottom of the box body, and the supporting legs can be folded, so that the rollers can be conveniently contacted with the ground, the equipment can be conveniently moved, the rollers can be lifted by the hydraulic push rod, the rollers can be contracted, the equipment can be conveniently placed on a desktop, and when the supporting legs are not folded, the equipment can be placed on the ground, so that the use is convenient.

2. The humidifier and the dehumidifier are arranged in the upper cavity, so that the inside of the display box can always keep proper humidity, the displayed product cannot deform due to humidity or crack due to drying, the effect of protecting the displayed product is achieved, the practicability is improved, and the illuminating lamp is arranged at the top of the inner wall of the display box, so that the product of a fighter can obtain good appearance, and the watching of people is facilitated.

3. The rotary table is driven to rotate by the motor to drive the second rotating shaft and the first rotating shaft, so that the rotary table can rotate, displayed products can rotate, people can watch the products conveniently, the two clamping blocks are driven to extrude each other by the second hydraulic push rod, the displayed products can be clamped, the protection effect is achieved, and the displayed products cannot move randomly.

4. According to the invention, the second camera is arranged on the top of the inner wall of the display box, a shot picture can be transmitted to the projector, and then the third hydraulic push rod drives the connecting rod to move, so that the projector rises, and the picture in the display box can be projected at other positions, thereby being convenient for people to watch and use.

5. According to the invention, the first transmitter can be arranged to transmit the operation condition inside the driving mechanism to the remote room, so that the operation condition inside the driving mechanism can be remotely checked, and the second transmitter can be used to transmit the picture inside the display box to the remote monitoring room, so that the display condition of the product can be known in real time, and the product can be prevented from being stolen.

Drawings

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

FIG. 2 is a front view of the present invention;

FIG. 3 is a view showing the internal structure of the case of the present invention;

FIG. 4 is an enlarged schematic view of the invention A;

FIG. 5 is an enlarged schematic view of invention B;

fig. 6 is a structural view of a projection mechanism of the present invention.

In the figure: 1 box body, 101 lower cavity, 102 upper cavity, 2 supporting legs, 3 display box, 4 knobs, 5 metal grooves, 6 magnets, 7 rollers, 8 roller grooves, 9 hydraulic push rod grooves, 10 hydraulic push rod I, 11 driving mechanisms, 1101 rotating shaft I, 1102 bearing I, 1103 rotating shaft II, 1104 bearing II, 1105 belt pulleys, 1106 belts, 1107 motors, 1108 helical gears, 1109 camera I, 1110 transmitter I, 12 clamping mechanisms, 1201 rotating discs, 1202 clamping blocks, 1203 hydraulic push rod II, 1204 limiting blocks, 1205 limiting holes, 13 humidifiers, 14 dehumidifiers, 15 air holes, 16 camera II, 17 illuminating lamps, 18 projection mechanisms, 1801 movable grooves, 1802 top covers, 1803 projectors 1804, three hydraulic push rods, 1805 connecting rods, 19 exhaust fans and 20 exhaust channels.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like 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.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1-6, the present invention provides a technical solution: a display device based on the Internet of things comprises a box body 1, a lower cavity 101 and an upper cavity 102 are arranged inside the box body 1, supporting legs 2 and rollers 7 are fixedly arranged at the bottom of the box body 1, a display box 3 is fixedly arranged at the top of the box body 1, a driving mechanism 11 is arranged inside the upper cavity 102, the driving mechanism 11 comprises a first rotating shaft 1101, bearings 1102 are fixedly connected to the top of the inner wall and the bottom of the inner wall of the lower cavity 101, the upper end and the lower end of the first rotating shaft 1101 are rotatably connected with the bearings 1102, the top of the first rotating shaft 1101 penetrates into the display box 3, a clamping mechanism 12 is arranged inside the display box 3, the clamping mechanism 12 comprises a rotating disc 1201, the bottom of the rotating disc 1201 is fixedly connected with the top of the first rotating shaft 1101, a second camera 16 is fixedly connected to the middle of the top of the inner wall of the display box 3, and a projector 1803 can be transmitted with a shot picture by installing, then the hydraulic push rod three 1804 drives the connecting rod 1805 to move, so that the projector 1804 rises, so that the picture inside the display box 3 can be projected at other positions, so that people can conveniently watch the picture, the use is convenient, the two sides of the camera two 16 are fixedly connected with the illuminating lamps 17 at the top of the inner wall of the display box 3, the top of the display box 3 is provided with the projection mechanism 18, the projection mechanism 18 comprises a movable groove 1801, the movable groove 1801 is arranged at the top of the display box 3, the projector 1803 is arranged inside the movable groove 1801, the humidifier 13 and the dehumidifier 14 are arranged inside the upper cavity 102, so that the inside of the display box 3 can always keep proper humidity, the displayed product cannot deform due to humidity or crack due to drying, the effect of protecting the displayed product is achieved, the practicability is improved, and the illuminating lamp 17 arranged at the top of the inner wall of the display box 3 can enable the product of a soldier to obtain good impression, being favorable to people to watch, can sending the inside behavior of actuating mechanism 11 to long-range room through setting up transmitter 1110 to can look over inside behavior long-rangely, can send the remote monitoring room with the inside picture of show case 3 through transmitter two 1806, thereby can know the bandwagon condition of product in real time, avoid stolen.

The top of supporting leg 2 is articulated with the bottom of box 1, knob 4 is installed in one side at the 2 tops of supporting leg in the bottom of box 1, the top of supporting leg 2 is opened has the through-hole that matches with the knob, the one end at knob 4 is pegged graft with the through-hole at the 2 tops of supporting leg, open bottom one side of supporting leg 2 has metal slot 5, the bottom fixedly connected with magnet 6 of box 1, the position of magnet 6 is the same with the position of metal slot 5 when supporting leg 2 is folding.

The top of gyro wheel 7 is opened in the bottom of box 1 has gyro wheel groove 8, open at the inner wall top of gyro wheel groove 8 has hydraulic push rod groove 9, the inside fixedly connected with hydraulic push rod 10 of hydraulic push rod groove 9, the bottom of hydraulic push rod 10 and the top fixed connection of gyro wheel 7, the gyro wheel 7 of box 1 bottom is equipped with four groups altogether, through installing supporting leg 2 and gyro wheel 7 in the bottom of box 1, and supporting leg 2 can be folded, thereby can make things convenient for gyro wheel 7 and ground contact, thereby can make equipment conveniently remove, and gyro wheel 7 can be gone up and down by hydraulic push rod 10, thereby make gyro wheel 7 can contract, thereby make things convenient for equipment to place on the desktop, when supporting leg 2 is not folding, can place equipment on ground, thereby facilitate the use.

The left side of the first rotating shaft 1101 is provided with a second rotating shaft 1103, the top and bottom ends of the second rotating shaft 1103 are fixedly connected with a second bearing 1104 on the top and bottom of the inner wall of the lower cavity 101, the second rotating shaft 1103 is rotatably connected with the second bearing 1104, the middle parts of the first rotating shaft 1101 and the second rotating shaft 1103 are both fixedly connected with belt pulleys 1105, the two belt pulleys 1105 are in transmission connection through a belt 1106, the bottom of the inner wall of the lower cavity 101 is fixedly connected with a motor 1107, the left side of the motor 1107 and the middle part of the second rotating shaft 1103 are both fixedly connected with bevel gears 1108, the two bevel gears 1108 are mutually meshed, the right side of the inner wall of the lower cavity 101 is fixedly connected with a first camera 1109.

The internally mounted of carousel 1201 has two clamp splices 1202, fixedly connected with hydraulic push rod two 1203 between the inner wall side of two clamp splices 1202 and carousel 1201, the bottom fixedly connected with stopper 1204 of two clamp splices 1202, spacing hole 1205 has been opened to the side of carousel 1201, stopper 1204 and spacing hole 1205 sliding connection, it rotates with pivot 1101 to drive pivot two 1103 through motor 1107, thereby let carousel 1201 rotate, thereby the product that makes the show can rotate, thereby be favorable to people to watch, and drive two clamp splices 1202 mutual extrusions through hydraulic push rod two 1203, thereby the product that makes the show can press from both sides tightly, thereby play the effect of protection, and can not let the product of show move about.

The humidifier 13 and the dehumidifier 14 are fixedly connected to the bottom of the inner wall of the upper cavity 102, and the air holes 15 are formed in the bottom of the display box 3.

A top cover 1802 is installed at the top of the movable groove 1801, a second transmitter 1806 is fixedly connected to the upper right corner of the display box 3, a third hydraulic push rod 1804 is installed at the bottom of the projector 1803, a connecting rod 1805 is installed between the third hydraulic push rod 1804 and the bottom of the projector 1803, the top of the connecting rod 1805 is hinged to the projector 1803, and the bottom of the connecting rod 1805 is hinged to one end of the third hydraulic push rod 1804.

An air exhaust channel 20 is arranged on the left side of the top of the display box 3, and an exhaust fan 19 is fixedly connected inside the air exhaust channel 20.

When in use, the bottom of the box body 1 is provided with the supporting legs 2 and the rollers 7, the supporting legs 2 can be folded, so that the rollers 7 can be conveniently contacted with the ground, so that the equipment can be conveniently moved, the rollers 7 can be lifted by the first hydraulic push rod 10, so that the rollers 7 can be contracted, so that the equipment can be conveniently placed on a table, when the supporting legs 2 are not folded, the equipment can be placed on the ground, so that the equipment is convenient to use, the humidifier 13 and the dehumidifier 14 are arranged in the upper cavity 102, so that the inside of the display box 3 can be always kept at proper humidity, so that the displayed product cannot be deformed due to humidity or cracked due to dryness, the effect of protecting the displayed product is achieved, the practicability is improved, and the top of the inner wall of the display box 3 is provided with the illuminating lamp 17, so that the products of soldiers can obtain good impression, the display box is beneficial to people to watch, the motor 1107 drives the second rotating shaft 1103 and the first rotating shaft 1101 to rotate, so that the turntable 1201 rotates, a displayed product can rotate, the display box is beneficial to people to watch, the two clamping blocks 1202 are driven to extrude each other through the second hydraulic push rod 1203, the displayed product can be clamped, a protection effect is achieved, and the displayed product cannot move randomly, the second camera 16 is installed at the top of the inner wall of the display box 3, a shot picture can be transmitted to the projector 1803, then the third hydraulic push rod 1804 drives the connecting rod 1805 to move, so that the projector 1804 ascends, the picture in the display box 3 can be projected at other positions, the display box is convenient to watch and use, the running condition in the driving mechanism 11 can be sent to a remote room through the first transmitter 1110, and the running condition in the display box can be remotely checked, the second transmitter 1806 can transmit the picture inside the display box 3 to the remote monitoring room, so that the display condition of the product can be known in real time.

In conclusion, the present invention can be obtained by installing the supporting legs 2 and the rollers 7 at the bottom of the box body 1, and the supporting legs 2 can be folded, so that the rollers 7 can be conveniently contacted with the ground, so that the equipment can be conveniently moved, and the rollers 7 can be lifted by the hydraulic push rods 10, so that the rollers 7 can be retracted, so that the equipment can be conveniently placed on a table, when the supporting legs 2 are not folded, the equipment can be placed on the ground, so that the equipment can be conveniently used, by installing the humidifier 13 and the dehumidifier 14 inside the upper cavity 102, the inside of the display box 3 can be always kept at a proper humidity, so that the displayed product can not be deformed due to humidity or cracked due to dryness, thereby playing a role of protecting the displayed product, so that the practicability is improved, and by installing the illuminating lamp 17 at the top of the inner wall of the display box 3, the products of soldiers can obtain a good appearance, the display box is beneficial to people to watch, the motor 1107 drives the second rotating shaft 1103 and the first rotating shaft 1101 to rotate, so that the turntable 1201 rotates, a displayed product can rotate, the display box is beneficial to people to watch, the two clamping blocks 1202 are driven to extrude each other through the second hydraulic push rod 1203, the displayed product can be clamped, a protection effect is achieved, and the displayed product cannot move randomly, the second camera 16 is installed at the top of the inner wall of the display box 3, a shot picture can be transmitted to the projector 1803, then the third hydraulic push rod 1804 drives the connecting rod 1805 to move, so that the projector 1804 ascends, the picture in the display box 3 can be projected at other positions, the display box is convenient to watch and use, the running condition in the driving mechanism 11 can be sent to a remote room through the first transmitter 1110, and the running condition in the display box can be remotely checked, the picture inside the display box 3 can be sent to a remote monitoring room through the second transmitter 1806, so that the display condition of the product can be known in real time, and the product is prevented from being stolen.

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. The utility model provides a display device based on thing networking, includes box (1), its characterized in that: the inside of the box body (1) is provided with a lower cavity (101) and an upper cavity (102), the bottom of the box body (1) is fixedly provided with supporting legs (2) and rollers (7), the top of the box body (1) is fixedly provided with a display box (3), the inside of the upper cavity (102) is provided with a driving mechanism (11), the driving mechanism (11) comprises a first rotating shaft (1101), the top of the inner wall of the lower cavity (101) and the bottom of the inner wall are fixedly connected with a first bearing (1102), the upper end and the lower end of the first rotating shaft (1101) are rotatably connected with the first bearing (1102), the top of the first rotating shaft (1101) penetrates into the inside of the display box (3), the inside of the display box (3) is provided with a clamping mechanism (12), the clamping mechanism (12) comprises a turntable (1201), and the bottom of the turntable (1201) is fixedly connected with the top of the first rotating shaft (1101), the middle part fixedly connected with camera two (16) at the inner wall top of show case (3), the inner wall top fixedly connected with light (17) of both sides at show case (3) of camera two (16), projection mechanism (18) are installed at the top of show case (3), projection mechanism (18) are including activity groove (1801), the top at show case (3) is established in activity groove (1801), the internally mounted of activity groove (1801) has projector (1803).

2. The internet of things-based display device of claim 1, wherein: the top of supporting leg (2) is articulated with the bottom of box (1), knob (4) are installed in the bottom of box (1) to one side at supporting leg (2) top, open at the top of supporting leg (2) has the through-hole that matches with the knob, the one end of knob (4) is pegged graft with the through-hole at supporting leg (2) top, open bottom one side of supporting leg (2) has metal slot (5), the bottom fixedly connected with magnet (6) of box (1), the position of magnet (6) is the same with the position of metal slot (5) when supporting leg (2) are folded.

3. The internet of things-based display device of claim 1, wherein: the top of gyro wheel (7) is opened in the bottom of box (1) has gyro wheel groove (8), the inner wall top of gyro wheel groove (8) is opened hydraulic push rod groove (9), the inside fixedly connected with hydraulic push rod (10) in hydraulic push rod groove (9), the bottom of hydraulic push rod (10) and the top fixed connection of gyro wheel (7), gyro wheel (7) of box (1) bottom are equipped with four groups altogether.

4. The internet of things-based display device of claim 1, wherein: a second rotating shaft (1103) is arranged on the left side of the first rotating shaft (1101), the upper end and the lower end of the second rotating shaft (1103) are fixedly connected with a second bearing (1104) at the top of the inner wall and the bottom of the inner wall of the lower cavity (101), the second rotating shaft (1103) is rotatably connected with the second bearing (1104), the middle parts of the first rotating shaft (1101) and the second rotating shaft (1103) are fixedly connected with belt pulleys (1105), the two belt pulleys (1105) are in transmission connection through a belt (1106), the bottom of the inner wall of the lower cavity (101) is fixedly connected with a motor (1107), the left side of the motor (1107) and the middle part of the second rotating shaft (1103) are both fixedly connected with helical gears (1108), the two helical gears (1108) are mutually meshed, the right side of the inner wall of the lower cavity (101) is fixedly connected with a first camera (1109), the bottom of the inner wall of the right side of the lower cavity (101) is fixedly connected with a first transmitter (1110).

5. The internet of things-based display device of claim 1, wherein: the inner mounting of the rotary table (1201) is provided with two clamping blocks (1202), a second hydraulic push rod (1203) is fixedly connected between the two clamping blocks (1202) and the side face of the inner wall of the rotary table (1201), the bottoms of the two clamping blocks (1202) are fixedly connected with limiting blocks (1204), limiting holes (1205) are formed in the side face of the rotary table (1201), and the limiting blocks (1204) are in sliding connection with the limiting holes (1205).

6. The internet of things-based display device of claim 1, wherein: the bottom of the inner wall of the upper cavity (102) is fixedly connected with a humidifier (13) and a dehumidifier (14), and the bottom of the display box (3) is provided with air holes (15).

7. The internet of things-based display device of claim 1, wherein: top cap (1802) are installed at the top of activity groove (1801), the upper right corner fixedly connected with transmitter two (1806) of show case (3), hydraulic push rod three (1804) is installed to the bottom of projecting apparatus (1803), install connecting rod (1805) between the bottom of hydraulic push rod three (1804) and projecting apparatus (1803), the top and projecting apparatus (1803) of connecting rod (1805) are articulated, the bottom and the one end of hydraulic push rod three (1804) of connecting rod (1805) are articulated.

8. The internet of things-based display device of claim 1, wherein: an air exhaust channel (20) is formed in the left side of the top of the display box (3), and an exhaust fan (19) is fixedly connected inside the air exhaust channel (20).