CN112365810B

CN112365810B - LED structure and LED screen thereof

Info

Publication number: CN112365810B
Application number: CN202011174230.1A
Authority: CN
Inventors: 阎勇; 庄梦杰; 徐云涛
Original assignee: Smart Zhejiang Information Technology Co ltd
Current assignee: Smart Zhejiang Information Technology Co ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2022-05-17
Anticipated expiration: 2040-10-28
Also published as: CN112365810A

Abstract

The invention relates to the field of LED screens, in particular to an LED structure and an LED screen thereof. An LED screen with an LED structure comprises a main screen and a plurality of auxiliary screens. Can solve current LED screen single dependence LED screen and show the image, visual effect is single, secondly, because the LED screen is formed by the concatenation of LED module panel, and the inside light emitting component of LED module panel damages easily in long-time use, can lead to whole LED screen local the not bright condition to appear this moment, therefore only can dismantle change or overhaul, and traditional LED screen is limited to the structure of LED module panel concatenation, lead to dismantling the change, it is all extremely inconvenient to overhaul, and dismantle the unable normal use of whole LED screen of change or in-process of overhauing.

Description

LED structure and LED screen thereof

Technical Field

The invention relates to the field of LED screens, in particular to an LED structure and an LED screen thereof.

Background

The LED display screen is a flat panel display, which is composed of small LED module panels, and is used to display various information such as text, images, video, etc.

However, there is certain defect still in current LED screen when using, at first, the image is shown to single dependence LED screen, visual effect is single, secondly, because the LED screen is formed by the concatenation of LED module panel, and the inside light emitting component of LED module panel damages easily in long-time use, can lead to whole LED screen local the not bright condition of appearance this moment, therefore only can dismantle change or overhaul, and traditional LED screen is limited to the structure of LED module panel concatenation, lead to dismantling the change, it is all extremely inconvenient to overhaul, and dismantle the unable normal use of the in-process of changing or overhauing whole LED screen, traditional LED screen can't carry out the function that different kinds of light emitting component freely switched according to actual user demand simultaneously.

Disclosure of Invention

The invention aims to provide an LED structure and an LED screen thereof, which can solve the problem that the existing LED screen displays images only by means of the LED screen, has a single visual effect, and can only be disassembled, replaced or overhauled because the LED screen is formed by splicing LED module panels, and light-emitting elements in the LED module panels are easy to damage in the long-time use process, so that the local part of the whole LED screen is not bright, and the traditional LED screen is limited to the spliced structure of the LED module panels, so that the disassembly, replacement and overhaul are extremely inconvenient, the whole LED screen cannot be normally used in the disassembly, replacement or overhaul process, and meanwhile, the traditional LED screen cannot freely switch different types of light-emitting elements according to the actual use requirements.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a LED structure, includes the LED module, the LED module is six post structures, just be provided with six rows of evenly distributed's LED groove on the LED module outer wall, every LED inslot portion all installs a LED light emitting component, LED module both ends middle part all is provided with a hole groove, hole inslot portion installs a cylinder, six solenoid valves of cylinder pipe connection, every solenoid valve connect separately one be located the horizontal pipe of hole inslot portion, every violently all be connected with one row of pneumatic traction lever on the outer wall of pipe, every pneumatic traction lever connects a LED light emitting component, is located to connect in parallel through the wire between the LED light emitting component of same row, be provided with a ring channel on the one end lateral wall of LED module, be provided with six evenly distributed's the slot that is used for the LED light emitting component circular telegram on the ring channel.

A LED screen with an LED structure comprises a main screen and a plurality of auxiliary screens, wherein the main screen is hung below a back frame through a hanging frame positioned at the top of the main screen, a plurality of LED frames which are uniformly distributed are arranged in the main screen, each LED frame is provided with an LED module, the outer walls of the two sides of the main screen are respectively provided with a vertical row of mounting holes which are uniformly distributed, each mounting hole is internally provided with a rotating shaft in a penetrating way, the rotating shaft is connected into the main screen and fixedly connected onto a hole groove, a vertical row of plugs are fixedly arranged on the inner wall of one side of the main screen, each plug is connected with a wiring board positioned on the outer wall of the main screen through a conducting wire, one side of the wiring board is provided with a conveying belt, the conveying belt is sleeved on the rotating shaft of the vertical row, the rotating shaft positioned at the bottom of the conveying belt is connected with a driving motor fixed on the side wall of the main screen, a servo motor is fixedly arranged at the middle position of the bottom of the back frame, two ends of the back frame are respectively fixedly connected with a guide rail, the top of the servo motor is connected with a driving shaft, the top end of the driving shaft is connected with a main bevel gear, the main bevel gear is engaged with two auxiliary bevel gears which are symmetrically arranged, the two auxiliary bevel gears are respectively connected with a rotating rod, the two rotating rods are both positioned at the bottom of the hanging bracket, and one ends, far away from the two rotating rods, of the two rotating rods are respectively connected with a gear;

the top of two guide rails is provided with a spout respectively, two a rack is all installed at the spout top, the rack meshes with the gear, just the rack bottom is through the vaulting pole of running through a plurality of support guide rails of connecting rod connection of spout, every a plurality of pulley is all installed to the vaulting pole bottom, and every all install a folding leg on the vaulting pole, and every the equal fixed mounting of one end of folding leg has a vice screen.

Preferably, the plug and the slot are used in a matched manner, and after the plug is inserted into the slot, the same row of LED light-emitting elements corresponding to the slot are electrified.

Preferably, the rack is in sliding connection with the sliding groove through a gear, and the gear is in transmission connection with the servo motor through a rotating rod.

The invention has the beneficial effects that: because the auxiliary screen exists and is arranged below the guide rail through the folding frame and the support rod, when the auxiliary screen needs to be adjusted, the servo motor can be utilized to drive the driving shaft to rotate, the driving shaft drives the two auxiliary bevel gears to rotate through the main bevel gear in the rotating process, the two auxiliary bevel gears are driven by the main bevel gear to rotate in the same direction and respectively drive one rotating rod to rotate, the rotating rod drives the gear to rotate in the rotating process, the gear drives the rack to slide on the guide rail in the rotating process to adjust the position, the rack pulls the support rod to adjust the position in the sliding process, the position of the auxiliary screen is adjusted, and then the folding frame is folded to enable the whole LED screen to be used in a way that the main screen and the auxiliary screen are matched with each other, so that a better visual effect is achieved;

because the LED module is of a hexahedral column structure, the LED light-emitting elements arranged in each row of LED grooves can be of different types, such as high brightness, soft light and the like, and the LED module can rotate on a main screen, when the LED light-emitting elements of different types need to be switched, an external PLC controller is utilized to control a driving motor to drive a conveyor belt to rotate, so as to drive all rotating shafts to rotate, the rotating shafts drive the LED modules to rotate in the rotating process, plugs rotate in annular grooves in the rotating process of the LED module, when the required LED light-emitting elements are switched, the required LED light-emitting elements are rotated to be in a vertical state, the plugs are connected into corresponding slots, the required row of LED light-emitting elements are connected with a power supply to be normally used, other LED light-emitting elements are not electrified and cannot be used, so that the whole LED screen can be freely switched to use different types of LED light-emitting elements according to actual conditions, the practicability is stronger, and only one row of LED light-emitting elements operates all the time in the switching process, so that the situation of wasting power resources can not occur;

due to the rotatable characteristic of the LED module, when the LED light-emitting element in the local LED groove is damaged and cannot be normally used, at the moment, the use of the whole LED screen is not required to be stopped, only the external PLC controller is used for controlling the driving motor to drive the conveyor belt to rotate, the LED module which is originally positioned on the front side of the main screen and is in a vertical state is rotated to the back side of the main screen by the rotation of the conveyor belt, and other LED modules are used for replacing the original LED module, so that the LED screen can still be normally used, at the moment, the external PLC controller is used for controlling the cylinder to start, and the electromagnetic valves corresponding to the row of LED modules positioned on the back surface are controlled to be opened, the air cylinders supply air to the inner part of the transverse pipe and drive the pneumatic traction rods to extend to eject the LED modules out of the LED grooves, therefore, the LED screen is convenient for operators to replace or overhaul, and the LED structure with the structure enables the LED screen to be repaired or elements to be replaced without shutdown when the LED screen is used.

Drawings

To facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

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

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

FIG. 3 is an enlarged view of the detail of area A in FIG. 1;

FIG. 4 is a schematic diagram of a main screen structure according to the present invention;

FIG. 5 is a schematic structural view of the main screen without the LED module installed;

FIG. 6 is a schematic view of an LED module according to the present invention;

FIG. 7 is a cross-sectional view of an LED module of the present invention;

FIG. 8 is a schematic structural diagram of a servo motor according to the present invention;

in the figure: 1. a back frame; 2. a hanger; 3. a servo motor; 4. a rotating rod; 5. a main screen; 6. a guide rail; 7. a rack; 8. a stay bar; 9. a chute; 10. a folding frame; 11. a sub-screen; 12. a gear; 13. a rotating shaft; 14. a conveyor belt; 15. a wiring board; 16. a drive motor; 17. an LED module; 18. an LED slot; 19. a plug; 20. an annular groove; 21. a slot; 22. a hole groove; 23. a pneumatic drawbar; 24. a cylinder; 25. a drive shaft; 26. a main bevel gear; 27. a secondary bevel gear; 28. an LED light emitting element; 29. a transverse tube; 30. an LED holder.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, an LED structure includes an LED module 17, the LED module 17 is a hexahedral pillar structure, the outer wall of the LED module 17 is provided with six rows of uniformly distributed LED grooves 18, an LED light-emitting element 28 is mounted inside each LED groove 18, the middle parts of two ends of the LED module 17 are respectively provided with a hole groove 22, an air cylinder 24 is mounted inside each hole groove 22, the air cylinder 24 is connected with six electromagnetic valves through pipelines, each electromagnetic valve is respectively connected with a transverse pipe 29 located inside each hole groove 22, the outer wall of each transverse pipe 29 is connected with a row of pneumatic traction rods 23, each pneumatic traction rod 23 is connected with one LED light-emitting element 28, the LED light-emitting elements 28 located in the same row are connected in parallel through a wire, the side wall of one end of the LED module 17 is provided with an annular groove 20, and the annular groove 20 is provided with six uniformly distributed slots 21 for electrifying the LED light-emitting elements 28.

An LED screen with an LED structure comprises a main screen 5 and a plurality of auxiliary screens 11, wherein the main screen 5 is hung below a back frame 1 through a hanging frame 2 positioned at the top of the main screen 5, a plurality of LED frames 30 which are uniformly distributed are arranged inside the main screen 5, each LED frame 30 is provided with an LED module 17, the outer walls of two sides of the main screen 5 are respectively provided with a vertical row of mounting holes which are uniformly distributed, a rotating shaft 13 penetrates through the inside of each mounting hole, the rotating shaft 13 is connected into the main screen 5 and is fixedly connected onto a hole groove 22, a vertical row of plugs 19 are fixedly arranged on the inner wall of one side of the main screen 5, each plug 19 is connected with a wiring board 15 positioned on the outer wall of the main screen 5 through a lead, a conveying belt 14 is arranged on one side of the wiring board 15, the conveying belt 14 is sleeved on the rotating shaft 13 in the vertical row, and the rotating shaft 13 positioned at the bottom is connected with a driving motor 16 fixed on the side wall of the main screen 5, a servo motor 3 is fixedly installed in the middle of the bottom of the back frame 1, two ends of the back frame 1 are respectively and fixedly connected with a guide rail 6, the top of the servo motor 3 is connected with a driving shaft 25, the top end of the driving shaft 25 is connected with a main bevel gear 26, two auxiliary bevel gears 27 which are symmetrically arranged are meshed on the main bevel gear 26, the two auxiliary bevel gears 27 are respectively connected with a rotating rod 4, the two rotating rods 4 are both positioned at the bottom of the hanging bracket 2, and one ends, far away from the two rotating rods 4, of the two rotating rods 4 are respectively connected with a gear 12;

two guide rail 6's top is provided with a spout 9 separately, a rack 7 is all installed at two spout 9 tops, rack 7 meshes with gear 12 mutually, and the bracing piece 8 of a plurality of support rail 6 is connected through the connecting rod that runs through spout 9 in rack 7 bottom, a plurality of pulley is all installed to every bracing piece 8 bottom, and all install a folding leg 10 on every bracing piece 8, and the equal fixed mounting of one end of every folding leg 10 has a vice screen 11, because vice screen 11's existence, make whole LED screen main screen 5 and vice screen 11 use of mutually supporting when using, can reach better visual effect.

The plug 19 and the slot 21 are used in a matched manner, and after the plug 19 is inserted into the slot 21, the same row of LED light-emitting elements 28 corresponding to the position of the slot 21 are electrified, so that only one row of LED light-emitting elements 28 operates all the time in the process of switching the LED module 17 on the LED screen, and the condition of wasting power resources cannot occur.

The rack 7 is connected with the sliding groove 9 in a sliding mode through the gear 12, and the gear 12 is connected with the servo motor 3 in a transmission mode through the rotating rod 4, so that when the position of the auxiliary screen 11 below the two guide rails 6 is adjusted, the adjustment can be completed only through one servo motor 3.

Because the LED modules 17 are in a hexahedral column structure, the LED light emitting elements 28 installed in each row of LED slots 18 can be in different types, such as strong brightness, soft light, etc., and the LED modules 17 can rotate on the main screen 5, when the LED light emitting elements 28 in different types need to be switched, the external PLC controller controls the driving motor 16 to drive the conveyor belt 14 to rotate, so as to drive all the rotating shafts 13 to rotate, the rotating shafts 13 drive the LED modules 17 to rotate in the rotating process, the plugs 19 rotate in the annular grooves 20 in the rotating process of the LED modules 17, when the required LED light emitting elements 28 are switched, the required LED light emitting elements 28 are rotated to the vertical state, the plugs 19 are connected into the corresponding slots 21, the required row of LED light emitting elements 28 can be normally used when the power is switched on, and the other LED light emitting elements 28 cannot be used when the power is not switched on, therefore, the whole LED screen can be freely switched to use different types of LED light-emitting elements 28 according to actual conditions, the practicability is higher, only one row of LED light-emitting elements 28 is operated all the time in the switching process, and the condition of wasting power resources cannot occur;

due to the rotatable characteristic of the LED module 17, when the LED light-emitting element 28 in the local LED groove 18 is damaged and cannot be normally used, at the moment, the use of the whole LED screen is not required to be stopped, only the external PLC controller is required to control the driving motor 16 to drive the conveyor belt 14 to rotate, the LED module 17 which is originally positioned on the front side of the main screen 5 and is in a vertical state is rotated to the back side of the main screen 5 by the rotation of the conveyor belt 14, and other LED modules 17 are used for replacing the original LED module 17, so that the LED screen can still be normally used, at the moment, the external PLC controller is used for controlling the cylinder 24 to be started and controlling the electromagnetic valves corresponding to one row of LED modules 17 on the back side to be opened, the cylinder 24 supplies air to the inside of the transverse pipe 29 and drives the pneumatic traction rod 23 to extend to eject the LED module 17 from the inside the LED groove 18, so that the replacement or the maintenance of an operator is facilitated, the LED structure with the structure enables the LED screen to be repaired or elements to be replaced without stopping when the LED screen is used.

A use method of an LED screen comprises the following specific steps:

the method comprises the following steps: when the auxiliary screen 11 needs to be adjusted, the servo motor 3 is started, the servo motor 3 is utilized to drive the driving shaft 25 to rotate, the driving shaft 25 drives the two auxiliary bevel gears 27 to rotate through the main bevel gear 26 in the rotating process, the two auxiliary bevel gears 27 are driven by the main bevel gear 26 to rotate in the same direction and respectively drive one rotating rod 4 to rotate, the rotating rod 4 drives the gear 12 to rotate in the rotating process, the gear 12 drives the rack 7 to slide on the guide rail 6 to adjust the position in the rotating process, the rack 7 pulls the support rod 8 to adjust the position in the sliding process, so that the position of the auxiliary screen 11 is adjusted, and then the folding frame 10 is folded;

step two: when the LED light-emitting elements 28 of different models need to be switched, the external PLC controller is used for controlling the driving motor 16 to drive the conveyor belt 14 to rotate, so that all the rotating shafts 13 are driven to rotate, the rotating shafts 13 drive the LED modules 17 to rotate in the rotating process, the plugs 19 of the LED modules 17 rotate in the annular grooves 20 in the rotating process, when the required LED light-emitting elements 28 are switched, the required LED light-emitting elements 28 are rotated to be in a vertical state, the plugs 19 are connected into the corresponding slots 21 at the moment, the required row of LED light-emitting elements 28 can be normally used when being connected with a power supply, and the other LED light-emitting elements 28 cannot be used when not being electrified;

when the LED light-emitting elements 28 in the local LED grooves 18 are damaged and cannot be normally used, at the moment, the use of the whole LED screen is not required to be stopped, only the external PLC is required to control the driving motor 16 to drive the conveying belt 14 to rotate, the LED modules 17 which are originally positioned on the front side of the main screen 5 and in a vertical state are rotated to the back side of the main screen 5 by utilizing the rotation of the conveying belt 14, the original LED modules 17 are replaced by other LED modules 17, so that the LED screen can still be normally used, at the moment, the air cylinder 24 is controlled to be started by utilizing the external PLC, the electromagnetic valves corresponding to one row of LED modules 17 positioned on the back side are controlled to be opened, the air cylinder 24 supplies air to the inner portion of the transverse pipe 29 and drives the pneumatic traction rod 23 to extend to eject the LED modules 17 out of the LED grooves 18, and an operator replaces or overhauls the damaged LED light-emitting elements 28.

When the invention is used, firstly, the servo motor 3, the wiring board 15, the driving motor 16, the cylinder 24 and the electromagnetic valve are all connected with an external power supply, and the servo motor 3, the wiring board 15, the driving motor 16, the cylinder 24 and the electromagnetic valve are all electrically connected with an external PLC (model: CPM1A), when the auxiliary screen 11 needs to be adjusted, the servo motor 3 is started, the servo motor 3 is utilized to drive the driving shaft 25 to rotate, the driving shaft 25 drives the two auxiliary bevel gears 27 to rotate through the main bevel gear 26 in the rotating process, the two auxiliary bevel gears 27 are driven by the main bevel gear 26 to rotate in the same direction and respectively drive one rotating rod 4 to rotate, the rotating rod 4 drives the gear 12 to rotate in the rotating process, the gear 12 drives the rack 7 to slide on the guide rail 6 to adjust the position, the rack 7 pulls the support rod 8 to adjust the position in the sliding process, thereby realizing the adjustment of the position of the auxiliary screen 11, then, the folding frame 10 is folded until the auxiliary screen 11 is in the state shown in fig. 2, at this time, the whole LED screen is the main screen 5 and the auxiliary screen 11 are used in cooperation, because the LED modules 17 are in a six-sided column structure, the LED light emitting elements 28 installed inside each row of LED slots 18 can be in different models, such as stronger brightness, soft light, etc., and the LED modules 17 can rotate on the main screen 5, when the LED light emitting elements 28 in different models need to be switched, the external PLC controller is used to control the driving motor 16 to drive the conveyor belt 14 to rotate, thereby driving all the rotating shafts 13 to rotate, the rotating shafts 13 drive the LED modules 17 to rotate in the rotating process, the plugs 19 of the LED modules 17 rotate inside the annular slots 20 in the rotating process, when the required LED light emitting elements 28 are switched, the required LED light emitting elements 28 are rotated to the vertical state, at this time, the plug 19 is connected into the corresponding slot 21, the required row of LED light-emitting elements 28 can be normally used when being powered on, and other LED light-emitting elements 28 cannot be used when not powered on; when the LED light emitting element 28 inside the LED slot 18 is damaged locally and cannot be used normally, at this time, the use of the whole LED screen is not stopped, only the external PLC controller is used for controlling the driving motor 16 to drive the conveyor belt 14 to rotate, the LED module 17 which is originally positioned on the front side of the main screen 5 and is in a vertical state is rotated to the back side of the main screen 5 by the rotation of the conveyor belt 14, and other LED modules 17 are used for replacing the original LED modules 17, so that the LED screen can still be normally used, at the moment, the air cylinder 24 is controlled to be started by an external PLC controller, and the electromagnetic valves corresponding to the row of LED modules 17 positioned at the back are controlled to be opened, the air cylinders 24 send air to the inside of the transverse tubes 29 and drive the pneumatic traction rods 23 to extend so as to push the LED modules 17 out of the LED grooves 18, therefore, the LED screen is convenient for operators to replace or overhaul, and the LED structure with the structure enables the LED screen to be repaired or elements to be replaced without shutdown when the LED screen is used.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. The LED screen comprises an LED module (17) and is characterized in that the LED module (17) is of a six-sided column structure, six rows of evenly distributed LED grooves (18) are formed in the outer wall of the LED module (17), each LED groove (18) is internally provided with an LED light-emitting element (28), hole grooves (22) are formed in the middle of the two ends of the LED module (17), an air cylinder (24) is internally arranged in each hole groove (22), the air cylinder (24) is connected with six electromagnetic valves in a pipeline mode, each electromagnetic valve is connected with a transverse pipe (29) located in each hole groove (22), each transverse pipe (29) is connected with one row of pneumatic traction rods (23) on the outer wall, each pneumatic traction rod (23) is connected with one LED light-emitting element (28), the LED light-emitting elements (28) located in the same row are connected in parallel through a wire, and an annular groove (20) is formed in one end side wall of the LED module (17), six slots (21) which are uniformly distributed and used for electrifying the LED luminous elements (28) are arranged on the annular groove (20);

the LED screen comprises a main screen (5) and a plurality of auxiliary screens (11), and is characterized in that the main screen (5) is hung below a back frame (1) through a hanging frame (2) positioned at the top of the main screen, a plurality of LED frames (30) which are uniformly distributed are arranged inside the main screen (5), each LED frame (30) is provided with an LED module (17), the outer walls of two sides of the main screen (5) are respectively provided with a vertical row of uniformly distributed mounting holes, a rotating shaft (13) is connected inside each mounting hole in a penetrating manner, each rotating shaft (13) is connected into the main screen (5) and is fixedly connected onto a hole groove (22), a vertical row of plugs (19) are fixedly arranged on the inner wall of one side of the main screen (5), each plug (19) is connected with a wire walking board (15) positioned on the outer wall of the main screen (5) through a wire, one side of the walking board (15) is provided with a conveying belt (14), the conveying belt (14) is sleeved on a vertical row of rotating shafts (13), the rotating shafts (13) located at the bottom are connected with driving motors (16) fixed on the side walls of a main screen (5), a servo motor (3) is fixedly installed in the middle of the bottom of the back frame (1), two ends of the back frame (1) are respectively and fixedly connected with a guide rail (6), the top of the servo motor (3) is connected with a driving shaft (25), the top end of the driving shaft (25) is connected with a main bevel gear (26), two auxiliary bevel gears (27) symmetrically arranged are meshed on the main bevel gear (26), the two auxiliary bevel gears (27) are respectively connected with a rotating rod (4), the two rotating rods (4) are both located at the bottom of the hanging bracket (2), and one ends, far away from the two rotating rods (4), of the two rotating rods (4) are respectively connected with a gear (12);

the top parts of the two guide rails (6) are respectively provided with a sliding groove (9), the top parts of the two sliding grooves (9) are respectively provided with a rack (7), the racks (7) are meshed with a gear (12), the bottom parts of the racks (7) are connected with a plurality of support rods (8) for supporting the guide rails (6) through connecting rods penetrating through the sliding grooves (9), the bottom parts of the support rods (8) are respectively provided with a plurality of pulleys, each support rod (8) is provided with a folding frame (10), and one end of each folding frame (10) is fixedly provided with an auxiliary screen (11);

the plug (19) and the slot (21) are used in a matched mode, and after the plug (19) is connected into the slot (21), the LED light-emitting elements (28) in the same row corresponding to the position of the slot (21) are electrified;

the rack (7) is connected with the sliding groove (9) in a sliding mode through a gear (12), and the gear (12) is in transmission connection with the servo motor (3) through a rotating rod (4).