CN113389982B

CN113389982B - International trade customs clearance flow teaching display device and method

Info

Publication number: CN113389982B
Application number: CN202110654700.2A
Authority: CN
Inventors: 王磊; 王伟娜
Original assignee: Henan Vocational and Technical College of Communications
Current assignee: Henan Vocational and Technical College of Communications
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2023-05-30
Anticipated expiration: 2041-06-11
Also published as: CN113389982A

Abstract

The invention discloses an international trade customs clearance flow teaching display device and a method, wherein the international trade customs clearance flow teaching display device comprises a playing screen, a box-shaped seat with an opening at the bottom is arranged below the playing screen, a storage protection mechanism matched with the playing screen is arranged on the box-shaped seat, a stable running mechanism matched with the storage protection mechanism is arranged on the box-shaped seat, the storage protection mechanism comprises a supporting rod fixedly arranged at the top of the box-shaped seat, and the top end of the supporting rod is fixedly connected with a protection box with the opening at the top. The invention has reasonable design, is convenient for personnel to move the device, is convenient for automatically storing the travelling wheels when moving out of the playing screen, increases the contact support area between the bottom and the ground, improves the parking stability, reduces the risk of displacement and shaking caused by false touch during use, realizes stable parking, is convenient for storing and protecting the playing screen after use, reduces the damage risk when the playing screen is not used, and is beneficial to use.

Description

International trade customs clearance flow teaching display device and method

Technical Field

The invention relates to the technical field of teaching display equipment, in particular to a teaching display device and a teaching display method for an international trade customs clearance flow.

Background

Customs clearance checking usually occurs in international import and export trade, the customs clearance checking aims at customs departments, the customs clearance checking aims at inspection and quarantine departments, and customs and quarantine are respectively and mutually connected, so that the customs clearance checking and the clearance checking are internally connected, the flow of the customs clearance checking is generally complicated, and new people are required to be trained so that the new people can quickly master professional skills; the existing teaching method mostly adopts a mode that a playing screen is matched with a lecturer to teach, and all customs clearance contents can be displayed through the mode that the playing screen plays.

The prior international trade customs clearance flow teaching display device, when in use, a playing screen thereof is mostly directly fixed on a movable supporting frame with a roller; the device and the method have the defects that the playing screen is inconvenient to store and protect after being used and the roller is stored and stopped stably during playing, (even the roller with the lock has the risk of displacement caused by false touch due to small friction area of the roller and the ground, and the playing screen is easy to damage after being exposed outside for a long time when not used), and the use requirement cannot be met, so that the device and the method for displaying the international trade customs declaration and inspection flow teaching are provided for solving the problems.

Disclosure of Invention

Based on the technical problems in the background technology, the invention provides a teaching display device and a teaching display method for an international trade customs clearance flow.

The invention provides an international trade customs clearance flow teaching display device which comprises a playing screen, wherein a box-shaped seat with an opening at the bottom is arranged below the playing screen, a storage protection mechanism matched with the playing screen is arranged on the box-shaped seat, and a stable running mechanism matched with the storage protection mechanism is arranged on the box-shaped seat.

Preferably, accomodate protection machanism includes the branch at fixed mounting at box shape seat top, the top fixedly connected with top of branch is the protection box that the opening set up, the front side fixed mounting of protection box has the clipboard, the broadcast screen is located the protection box, all seted up the spout on the both sides inner wall of protection box, and the slip cap is equipped with the slider in the spout, one side that two sliders are close to each other all extends to in the protection box and fixedly connected with same extension board, broadcast screen fixed mounting is at the top of extension board, the top movable contact of protection box has the apron, the top fixed mounting of slider has the guide bar, and the top of guide bar extends to the top of protection box and with the bottom fixed connection of apron, rectangular hole has been seted up on the top of branch, the downthehole slip cap of rectangle is equipped with the rectangle pole, the top of rectangle pole extends to in the protection box and with the bottom fixed connection of extension board, the bottom fixedly connected with bottom plate of box shape seat, and the top fixed mounting of bottom plate has battery and driving motor, battery and driving motor's output shaft top fixedly connected with screw rod, and the top rectangular hole of screw rod extends to the rectangle, the rectangle cover is set up the opening on the side of screw shape seat bottom.

Preferably, steady running gear is including setting up the back shaped plate in the box-shaped seat, driving motor and battery all are located the back shaped plate, the top fixedly connected with of back shaped plate two montants, the top of two montants all extends to the top of box-shaped seat and fixedly connected with same annular plate, annular plate slip cap is established on branch, the indent of breach shape has all been seted up to the bottom both sides of rectangular bar, equal fixedly connected with extrusion piece on the both sides inner wall of annular plate, one side that two extrusion pieces are close to each other all extends to the rectangular hole in, the top of extrusion piece and the top inner wall movable contact of the indent that corresponds, the bottom both sides of bottom plate all nest have rectangular support, the bottom bonding of rectangular support is fixed with anti-skidding cushion, two rectangular perforations have been seted up at the top of rectangular support, the top four corners of back shaped plate all are inlayed and are the outer tube of shutoff structure, and the bottom of outer tube extends to the rectangular perforation that corresponds and rotates and install the walking wheel, the bottom of four walking wheels extends to the below of corresponding cushion respectively, be rectangular fixed connection has four locating bars on the top inner wall of box-shaped seat, the rectangular location bar is set up at the top inner wall movable contact of rectangular inner wall of the rectangle, the rectangular location bar is located the rectangular compression groove between four compression grooves, the bottom of rectangular support is located the rectangular recess, and the bottom of rectangular compression groove is located between four rectangular compression grooves.

Preferably, a first round hole is formed in the inner wall of the top of the sliding groove, and the inner wall of the first round hole is in sliding connection with the outer side of the corresponding guide rod.

Preferably, a rectangular through hole is formed in the inner wall of the bottom of the protection box, the inner wall of the rectangular through hole is in sliding connection with the outer side of the rectangular rod, a thread groove is formed in the bottom end of the rectangular rod, and the thread groove is in threaded connection with the screw rod.

Preferably, a second round hole is formed in the inner wall of the top of the box-shaped seat, a bearing is fixedly sleeved in the second round hole, and the inner ring of the bearing is fixedly sleeved with the outer side of the screw rod.

Preferably, two third round holes are formed in the inner wall of the top of the box-shaped seat, and the inner wall of each third round hole is in sliding connection with the outer side of the corresponding vertical rod.

Preferably, sliding holes are formed in the inner walls of the two sides of the rectangular hole, and the front inner wall and the rear inner wall of the sliding holes are respectively connected with the front side and the rear side of the corresponding extrusion block in a sliding manner.

Preferably, the four corners of the top of the return-shaped plate are provided with embedded holes, the inner walls of the embedded holes are fixedly connected with the outer sides of the corresponding outer tubes, the top of the anti-skid rubber mat is provided with two first perforations, and the travelling wheels are positioned in the corresponding first perforations and are not in contact with the inner walls of the first perforations.

The invention also provides a method for the international trade customs clearance flow teaching display device, which comprises the following steps:

s1: when the rectangular rod is used, the driving motor is started in the forward direction, the output shaft of the driving motor drives the screw rod to rotate, and the screw rod can drive the rectangular rod to slide upwards in the rectangular hole through rotation of the screw rod;

s2: when the rectangular rod moves upwards in the S1, the support plate is driven to move upwards, the support plate drives the two sliding blocks to move upwards, the sliding blocks drive the cover plate to move upwards through the corresponding guide rods, the support plate drives the playing screen to move upwards gradually out of the protection box, at the moment, the playing screen can be used for playing teaching contents, and writing important teaching contents by the writing board;

s3: when the rectangular rod in the S1 moves upwards, the two pressing grooves are driven to move upwards, the pressing grooves gradually relax the extrusion force of the corresponding extrusion blocks upwards and are separated from the extrusion blocks, and the elastic force of the compression spring in a compressed state drives the return plate to move upwards;

s4: when the return-shaped plate in the step S3 moves upwards, the two vertical rods are driven to move upwards, the two vertical rods drive the annular plate to slide upwards on the supporting rods, and the annular plate drives the two extrusion blocks to move upwards;

s5: when the return-shaped plate in the S3 moves upwards, the four outer tubes are driven to slide upwards on the corresponding positioning rods respectively, the outer tubes drive the corresponding travelling wheels to move upwards and be stored in the rectangular through holes, at the moment, the two rectangular supports and the two anti-slip rubber mats are supported at the bottoms, so that the contact friction area with the ground is increased, and stable stop is realized;

s6: after the use, reverse start driving motor, the same reason is completely opposite with the direction of motion of above-mentioned forward start driving motor, the rectangle pole changes to the downwardly moving and drives the broadcast screen downwardly moving through the extension board and accomodate to the protection box in, realize accomodating the protection, the rectangle pole drives the top inner wall of two indent and extrudees two extrusion pieces downwardly, under the extrusion force, the extrusion piece downwardly moving and drive annular slab downwardly moving, annular slab passes through two montants and drives the rebound board downwardly moving, the rebound board compresses four compression springs downwardly, the rebound board passes through four outer tubes and drives four walking wheels downwardly moving out, alright remove through four walking wheels.

Compared with the prior art, the invention has the beneficial effects that:

the invention has reasonable design, is convenient for personnel to move the device, is convenient for automatically storing the travelling wheels when moving out of the playing screen, increases the contact support area between the bottom and the ground, improves the parking stability, reduces the risk of displacement and shaking caused by false touch during use, realizes stable parking, is convenient for storing and protecting the playing screen after use, reduces the damage risk when the playing screen is not used, and is beneficial to use.

Drawings

Fig. 1 is a schematic structural diagram of a teaching display device for the international trade customs clearance flow provided by the invention;

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

FIG. 3 is an enlarged schematic view of the portion A in FIG. 2;

fig. 4 is a schematic perspective view of a ring plate and extrusion block connector of the present invention.

In the figure: 100 broadcast screen, 1 protection box, 2 clipboards, 3 box shape seats, 4 support rods, 5 sliding grooves, 6 support plates, 7 sliding blocks, 8 guide rods, 9 cover plates, 10 rectangular holes, 11 rectangular rods, 12 screw rods, 13 bottom plates, 14 storage batteries, 15 driving motors, 16 return plates, 17 vertical rods, 18 annular plates, 19 pressing grooves, 20 pressing blocks, 21 rectangular supports, 22 rectangular perforation holes, 23 outer tubes, 24 walking wheels, 25 positioning rods, 26 anti-skid rubber gaskets, 27 rectangular grooves, 28 compression springs, 29 sliding holes and 30 rectangular ventilation holes.

Description of the embodiments

The invention is further illustrated below in connection with specific embodiments.

Examples

Referring to fig. 1-4, the embodiment provides an international trade customs clearance flow teaching display device, which comprises a playing screen 100, wherein a box-shaped seat 3 with an opening at the bottom is arranged below the playing screen 100, a storage protection mechanism matched with the playing screen 100 is arranged on the box-shaped seat 3, and a stable running mechanism matched with the storage protection mechanism is arranged on the box-shaped seat 3;

the storage protection mechanism comprises a supporting rod 4 fixedly mounted at the top of a box-shaped seat 3, the top end of the supporting rod 4 is fixedly connected with a protection box 1 with an opening at the top, a writing board 2 is fixedly mounted at the front side of the protection box 1, a playing screen 100 is positioned in the protection box 1, sliding grooves 5 are formed in the inner walls of the two sides of the protection box 1, sliding blocks 7 are sleeved in the sliding grooves 5 in a sliding manner, one side, close to each other, of each sliding block 7 extends into the protection box 1 and is fixedly connected with the same supporting plate 6, the playing screen 100 is fixedly mounted at the top of the supporting plate 6, the top of the protection box 1 is movably contacted with a cover plate 9, a guide rod 8 is fixedly mounted at the top of the sliding block 7, the top end of the guide rod 8 extends to the upper side of the protection box 1 and is fixedly connected with the bottom of the cover plate 9, a rectangular hole 10 is formed in the top end of the supporting rod 4, a rectangular rod 11 is sleeved in the rectangular hole 10 in a sliding manner, the top end of the rectangular rod 11 extends into the protection box 1 and is fixedly connected with the bottom of the supporting plate 6, a bottom of the box-shaped seat 3 is fixedly connected with a bottom plate 13, a storage battery 14 and a motor 15 are fixedly mounted at the top of the bottom plate 13 and is fixedly connected with a rectangular output shaft 15, a screw rod 12 is electrically connected with the top end of the rectangular output shaft 12, and the top end of the screw rod 12 is arranged at the top end of the rectangular screw rod 12 is fixedly connected with the top end of the rectangular screw rod 12, and the screw rod 12 is provided with the top end 12, which is provided with the top end of the screw hole 12, and the screw hole 12 is electrically connected with the top end of the screw hole 12 is arranged at the top end of the top end 3;

the stable running mechanism comprises a return plate 16 arranged in a box-shaped seat 3, a driving motor 15 and a storage battery 14 are both positioned in the return plate 16, the top of the return plate 16 is fixedly connected with two vertical rods 17, the top ends of the two vertical rods 17 are both extended to the upper part of the box-shaped seat 3 and are fixedly connected with the same annular plate 18, the annular plate 18 is slidably sleeved on a supporting rod 4, notch-shaped pressing grooves 19 are formed in the two sides of the bottom of the rectangular rod 11, pressing blocks 20 are fixedly connected to the inner walls of the two sides of the annular plate 18, one sides of the two pressing blocks 20, which are close to each other, are both extended into rectangular holes 10, the top of the pressing blocks 20 are movably contacted with the inner walls of the top of the corresponding pressing grooves 19, rectangular supports 21 are nested at the two sides of the bottom plate 13, anti-skid rubber pads 26 are fixedly bonded at the bottom of the rectangular supports 21, two rectangular perforations 22 are formed at the top of the rectangular supports 21, the four corners of the top of the rectangular support seat 16 are embedded with an outer tube 23 with the bottom end being a plugging structure, the bottom end of the outer tube 23 extends into the corresponding rectangular perforation 22 and is rotatably provided with travelling wheels 24, the bottoms of the four travelling wheels 24 respectively extend to the lower part of the corresponding anti-slip rubber cushion 26, four positioning rods 25 are fixedly connected to the inner wall of the top of the box-shaped seat 3 in a rectangular shape, the outer tube 23 is slidably sleeved on the corresponding positioning rods 25, two rectangular grooves 27 are arranged at the top of the rectangular support seat 21, the four rectangular grooves 27 are positioned between the four rectangular perforation 22, a compression spring 28 in a compressed state is fixedly connected between the inner wall of the bottom of the rectangular groove 27 and the bottom of the rectangular perforation 22, the embodiment is reasonable in design, the device is convenient for personnel to move, the travelling wheels 24 are conveniently and automatically accommodated while moving out of the playing screen 100, the contact supporting area of the bottom and the ground is increased, and the parking stability is improved, the risk of displacement rocking is taken place because of the mistake when reducing the use, realizes steadily stopping, and is convenient for accomodate the protection to broadcast screen 100 after using, reduces the damage risk when it does not use, is favorable to using.

In this embodiment, a first round hole is formed on the top inner wall of the chute 5, the inner wall of the first round hole is slidably connected with the outer side of the corresponding guide rod 8, a rectangular through hole is formed on the bottom inner wall of the protection box 1, the inner wall of the rectangular through hole is slidably connected with the outer side of the rectangular rod 11, a thread groove is formed at the bottom end of the rectangular rod 11, the thread groove is in threaded connection with the screw rod 12, a second round hole is formed on the top inner wall of the box-shaped seat 3, a bearing is fixedly sleeved in the second round hole, the inner ring of the bearing is fixedly sleeved on the outer side of the screw rod 12, two third round holes are formed on the top inner wall of the box-shaped seat 3, the inner wall of the third round holes is slidably connected with the outer side of the corresponding vertical rod 17, sliding holes 29 are formed on the inner walls of two sides of the rectangular hole 10, and the front side inner wall and the rear side inner wall of the slide hole 29 are respectively connected with the front side and the rear side of the corresponding extrusion block 20, the embedded holes are respectively formed in four corners of the top of the return plate 16, the inner walls of the embedded holes are fixedly connected with the outer sides of the corresponding outer tubes 23, two first through holes are formed in the tops of the anti-slip rubber pads 26, the travelling wheels 24 are positioned in the corresponding first through holes and are not contacted with the inner walls of the first through holes, the design of the embodiment is reasonable, the device is convenient for people to move, the travelling wheels 24 are convenient to take in when moving out of the playing screen 100, the contact supporting area between the bottom and the ground is increased, the parking stability is improved, the risk of displacement and shaking caused by false touch during use is reduced, stable stop is realized, the playing screen 100 is convenient to take in protection after use, the damage risk of the playing screen is reduced when the playing screen is not used, and the playing screen is beneficial to use.

The embodiment also provides a method for the international trade customs clearance flow teaching display device, which comprises the following steps:

s1: the arrangement of the four travelling wheels 24 is convenient for a person to move the device, after the movement is completed, when the device is used, the driving motor 15 is started in the forward direction, the output shaft of the driving motor 15 drives the screw rod 12 to rotate, and under the action of a thread groove formed on the rectangular rod 11, the screw rod 12 rotates to drive the rectangular rod 11 to slide upwards in the rectangular hole 10;

s2: when the rectangular rod 11 in the S1 moves upwards, the support plate 6 is driven to move upwards, the support plate 6 drives the two sliding blocks 7 to move upwards, the sliding blocks 7 drive the cover plate 9 to move upwards through the corresponding guide rods 8, the support plate 6 drives the playing screen 100 to move upwards and gradually out of the protection box 1, at the moment, the playing screen 100 can be used for playing teaching contents, and the writing board 2 is used for writing important teaching contents;

s3: when the rectangular rod 11 in the S1 moves upwards, the two pressing grooves 19 are driven to move upwards, the pressing grooves 19 gradually relax the extrusion force of the corresponding extrusion blocks 20 upwards and are separated from the extrusion blocks 20, and at the moment, the elastic force of the compression springs 28 in a compressed state drives the return plate 16 to move upwards;

s4: when the return-shaped plate 16 in the S3 moves upwards, the two vertical rods 17 are driven to move upwards, the two vertical rods 17 drive the annular plate 18 to slide upwards on the supporting rod 4, and the annular plate 18 drives the two extrusion blocks 20 to move upwards;

s5: when the return-shaped plate 16 in the S3 moves upwards, the four outer tubes 23 are driven to slide upwards on the corresponding positioning rods 25 respectively, the outer tubes 23 drive the corresponding travelling wheels 24 to move upwards and be stored in the rectangular through holes 22, at the moment, the two rectangular supports 21 and the two anti-skid rubber mats 26 are supported at the bottoms, so that the contact friction area with the ground is increased, stable stopping is realized, the parking stability is improved, and the risk of displacement and shaking caused by false collision during use is reduced;

s6: after the use, reverse start driving motor 15, the same reason is with the direction of motion of above-mentioned forward start driving motor 15 completely opposite, rectangular bar 11 changes to the downwardly moving and takes in to protection box 1 through the downthehole removal of extension board 6 drive broadcast screen 100, realize taking in the protection, rectangular bar 11 drives the top inner wall of two indent 19 and extrudees two extrusion piece 20 downwards, under the extrusion force, extrusion piece 20 moves down and drives annular plate 18 and move down, annular plate 18 drives back shaped plate 16 through two montants 17 and moves down, back shaped plate 16 compresses four compression springs 28 downwards, back shaped plate 16 drives four walking wheels 24 downwardly through four outer tubes 23 and shifts out, alright move through four walking wheels 24.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims

1. The utility model provides an international trade newspaper and inspection flow teaching display device, includes broadcast screen (100), the below of broadcast screen (100) is equipped with box-shaped seat (3) that the bottom set up for the opening, its characterized in that, be provided with on box-shaped seat (3) with broadcast screen (100) matched with accomodate protection mechanism, be provided with on box-shaped seat (3) with accomodate protection mechanism matched with steady stop running gear;

the storage protection mechanism comprises a supporting rod (4) fixedly mounted at the top of a box-shaped seat (3), a protection box (1) with an opening is fixedly connected to the top of the supporting rod (4), a writing board (2) is fixedly mounted at the front side of the protection box (1), a playing screen (100) is positioned in the protection box (1), sliding grooves (5) are formed in the inner walls of two sides of the protection box (1), sliding blocks (7) are sleeved in the sliding grooves (5) in a sliding manner, one side, close to each other, of each sliding block (7) extends into the protection box (1) and is fixedly connected with the same supporting plate (6), the playing screen (100) is fixedly mounted at the top of the supporting plate (6), a cover plate (9) is movably contacted with the top of the protection box (1), a guide rod (8) is fixedly mounted at the top of the sliding block (7), the top of the guide rod (8) extends to the upper side of the protection box (1) and is fixedly connected with the bottom of the cover plate (9), rectangular holes (10) are formed in the top of the supporting rod (4), rectangular holes (10) are sleeved with rectangular rods (11) and are fixedly connected with the bottom of the cover plate (9), the bottom of the protection box (6) is fixedly connected with the bottom of the supporting plate (6), the top of the bottom plate (13) is fixedly provided with a storage battery (14) and a driving motor (15), the storage battery (14) is electrically connected with the driving motor (15), the top end of an output shaft of the driving motor (15) is fixedly connected with a screw rod (12), the top end of the screw rod (12) extends into the rectangular hole (10), the rectangular rod (11) is sleeved on the screw rod (12) in a threaded manner, and the inner wall of the front side of the box-shaped seat (3) is provided with a rectangular vent hole (30) with an opening at the bottom;

the stable stop type travelling mechanism comprises a return plate (16) arranged in a box-shaped seat (3), a driving motor (15) and a storage battery (14) are both positioned in the return plate (16), the top of the return plate (16) is fixedly connected with two vertical rods (17), the top ends of the two vertical rods (17) are both extended to the upper part of the box-shaped seat (3) and fixedly connected with the same annular plate (18), the annular plate (18) is slidably sleeved on a supporting rod (4), notch-shaped pressing grooves (19) are formed in the two sides of the bottom of the rectangular rod (11), pressing blocks (20) are fixedly connected to the inner walls of the two sides of the annular plate (18), one sides of the two pressing blocks (20) close to each other are both extended into rectangular holes (10), the top of the pressing blocks (20) are movably contacted with the inner walls of the tops of the corresponding pressing grooves (19), rectangular supports (21) are both nested at the two sides of the bottom plate (13), anti-skid rubber pads (26) are fixedly bonded at the bottom of the rectangular supports (21), two rectangular perforated holes (22) are formed in the top of the rectangular supports (21), pressing blocks (19) are fixedly connected with pressing grooves (19) on the two sides of the inner walls of the bottom of the rectangular supports (16), the two rectangular supports (23) and the bottom of the inner tubes (23) are correspondingly provided with the bottom blocks (23), the bottom of four walking wheels (24) extends to the below of anti-skidding cushion (26) that corresponds respectively, be rectangle fixedly connected with four locating lever (25) on the top inner wall of box-shaped seat (3), outer tube (23) slip cap is established on corresponding locating lever (25), two rectangle recess (27) have been seted up at the top of rectangle support (21), four rectangle recess (27) are located between four rectangle perforation (22), fixedly connected with compression spring (28) that are in compression state between the bottom inner wall of rectangle recess (27) and the bottom of returning shaped plate (16).

2. The teaching display device for the international trade customs clearance flow according to claim 1, wherein a first round hole is formed in the inner wall of the top of the chute (5), and the inner wall of the first round hole is slidably connected with the outer side of the corresponding guide rod (8).

3. The teaching display device for the international trade customs clearance flow according to claim 1, wherein a rectangular through hole is formed in the inner wall of the bottom of the protection box (1), the inner wall of the rectangular through hole is slidably connected with the outer side of the rectangular rod (11), a thread groove is formed in the bottom end of the rectangular rod (11), and the thread groove is in threaded connection with the screw (12).

4. The teaching display device for the international trade customs clearance flow according to claim 1, wherein a second round hole is formed in the top inner wall of the box-shaped seat (3), a bearing is fixedly sleeved in the second round hole, and an inner ring of the bearing is fixedly sleeved with the outer side of the screw (12).

5. The teaching display device for the international trade customs clearance flow according to claim 1, wherein two third round holes are formed in the top inner wall of the box-shaped seat (3), and the inner wall of each third round hole is slidably connected with the outer side of the corresponding vertical rod (17).

6. The teaching display device for the international trade customs clearance flow according to claim 1, wherein sliding holes (29) are formed on the inner walls of the two sides of the rectangular hole (10), and the front inner wall and the rear inner wall of the sliding holes (29) are respectively connected with the front side and the rear side of the corresponding extrusion block (20).

7. The teaching display device for the international trade customs clearance flow according to claim 1, wherein the four corners of the top of the square plate (16) are provided with embedded holes, the inner walls of the embedded holes are fixedly connected with the outer sides of the corresponding outer tubes (23), the top of the anti-slip rubber mat (26) is provided with two first through holes, and the travelling wheels (24) are positioned in the corresponding first through holes and are not contacted with the inner walls of the first through holes.

8. A method of using the international trade customs clearance flow teaching display device according to any one of claims 1 to 7, comprising the steps of: s1: when the rectangular hole (10) is used, the driving motor (15) is started in the forward direction, the output shaft of the driving motor (15) drives the screw rod (12) to rotate, and the rectangular rod (11) can be driven to slide upwards in the rectangular hole (10) by the rotation of the screw rod (12); s2: when the rectangular rod (11) in the S1 moves upwards, the support plate (6) is driven to move upwards, the support plate (6) drives the two sliding blocks (7) to move upwards, the sliding blocks (7) drive the cover plate (9) to move upwards through the corresponding guide rods (8), the support plate (6) drives the playing screen (100) to move upwards and gradually out of the protective box (1), at the moment, the playing screen (100) can be used for playing teaching contents, and the writing board (2) is used for writing teaching key contents; s3: when the rectangular rod (11) in the S1 moves upwards, the two pressing grooves (19) are driven to move upwards, the pressing grooves (19) gradually relax the extrusion force of the corresponding extrusion blocks (20) upwards and are separated from the extrusion blocks (20), and at the moment, the elasticity of the compression springs (28) in a compressed state drives the return plate (16) to move upwards; s4: when the return-shaped plate (16) in the step S3 moves upwards, the two vertical rods (17) are driven to move upwards, the two vertical rods (17) drive the annular plate (18) to slide upwards on the supporting rod (4), and the annular plate (18) drives the two extrusion blocks (20) to move upwards; s5: when the return-shaped plate (16) in the step S3 moves upwards, the four outer tubes (23) are driven to slide upwards on the corresponding positioning rods (25), the outer tubes (23) drive the corresponding travelling wheels (24) to move upwards and be stored in the rectangular through holes (22), and at the moment, the two rectangular supports (21) and the two anti-skid rubber pads (26) are supported at the bottoms; s6: after the use, reverse start driving motor (15), the direction of motion of the same reason and above-mentioned forward start driving motor (15) is completely opposite, rectangular bar (11) change into the downwardly moving and drive broadcast screen (100) downwardly moving through extension board (6) and accomodate in protective box (1), realize accomodating the protection, rectangular bar (11) drive the top inner wall of two indent (19) to two extrusion piece (20) downwardly extrusion, under the extrusion force, extrusion piece (20) downwardly moving and drive annular slab (18) downwardly moving, annular slab (18) drive return board (16) downwardly moving through two montants (17), return board (16) downwardly compressing four compression springs (28), return board (16) drive four walking wheels (24) downwardly moving through four outer tubes (23), alright move through four walking wheels (24).