CN113643574A

CN113643574A - Think political affairs display device for education with from fixed knot structure

Info

Publication number: CN113643574A
Application number: CN202110971924.6A
Authority: CN
Inventors: 张洋; 杨扬; 王传飞
Original assignee: Nanyang Institute of Technology
Current assignee: Nanyang Institute of Technology
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2021-11-12

Abstract

The application relates to a think political affairs display device for education with from fixed knot structure, including equipment seat and the stand board of connecting in equipment seat top, still include: the display device comprises a first display board and a second display board, wherein a first sliding groove and a second sliding groove are formed in the inner wall of a stand column board, and electronic display screens are mounted on the display surfaces of the first display board and the second display board; the parking component is detachably arranged at the bottom of the assembling seat and comprises an installation frame, a wedge-shaped insertion plate is connected to the inner wall of the installation frame in a sliding mode, a moving wheel and a sliding plate are connected to the bottom of the installation frame, a telescopic column is connected to the inner wall of the sliding plate in a sliding mode, and an anti-skid block is arranged at the bottom of the telescopic column; the extension component is arranged at the back parts of the first display board and the second display board and is matched with the parking component; the invention can switch between fixed display and temporary display, and has the advantages of convenient disassembly, convenient transportation, rich display content and novel modeling.

Description

Think political affairs display device for education with from fixed knot structure

Technical Field

The invention relates to a display device with a self-fixing structure for ideological and political education, and belongs to the technical field of ideological and political education.

Background

Ideological and political education is that society or social group use certain thought concept, political view, moral standard, exert purposeful, planned, organized influence to its member, make them form the social practice activity that accords with the thought moral that certain society requires, it is the lesson of a lifelong study among the Chinese literature too, ideological and political education is the first content of the construction of Chinese spiritual civilization, it is one of the main ways to solve social contradiction and problem too, the personality education is the foundation of ideological and political education, there is not this foundation, ideological and political education is as if there is no duckweed, always drift in the thought surface of the people but can't go deep; today's social progress, the country has a lot of attention to student's ideological education, but, university ideological and political class arranges for relatively less during class, is easily ignored by the student, and publicity board, show board, gallery for university campus ideological and political education just seem necessary.

Through the retrieval, the patent that publication number is CN211376137U discloses a think political affairs education is with propaganda display device, including the support column, the top fixedly connected with show board plate body of support column, the right side on show board plate body front surface is rotated through the hinge and is connected with the returning face plate, the cavity has been seted up on the front surface of show board plate body. The turning plate is turned over, then the left side edge of the pictorial newspaper is fixed through the pictorial newspaper clamp on the surface of the movable column, the right side edge of the pictorial newspaper is fixed through the pictorial newspaper clamp on the surface of the fixed column, then the sliding block drives the sliding sleeve to slide through the upright column and drives the movable column to slide leftwards through the sliding block, and then the pictorial newspaper can be unfolded; this display device is when using, and the mode information volume that adopts the poster is less, and need fix in a position, is unfavorable for enlarging the display range and shows temporarily, when needs trade the place show or transport display device simultaneously, and the transport is also very inconvenient.

We have therefore developed this and propose a display device for ideological education having a self-fixing structure.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the display mode information volume that adopts the poster is less, and need fix in a position, is unfavorable for enlarging display range and interim show, when needs trade the place show or transport display device, carries also very inconvenient problem.

(II) technical scheme

In order to achieve the above object, the present invention provides a display device for ideological education having a self-fixing structure, including an assembly base and a pillar panel connected to a top of the assembly base, further including:

the display device comprises a first display board and a second display board, wherein a first sliding groove and a second sliding groove are formed in the inner wall of a stand column board, the first display board and the second display board are respectively connected to the inner walls of the first sliding groove and the second sliding groove in a sliding mode through sliding blocks, and electronic display screens are mounted on the display surfaces of the first display board and the second display board and used for increasing the display area, enriching the display content and increasing the display attractiveness;

the parking component is detachably arranged at the bottom of the assembling seat and comprises an installation frame, a wedge-shaped insertion plate is connected to the inner wall of the installation frame in a sliding mode, a moving wheel and a sliding plate are connected to the bottom of the installation frame, a telescopic column is connected to the inner wall of the sliding plate in a sliding mode, and an anti-skid block is arranged at the bottom of the telescopic column and used for increasing the stability of the parking component during temporary display;

the extension assembly is arranged on the back of the first display board and the back of the second display board, and the extension assembly is matched with the parking assembly and used for increasing the display area and facilitating disassembly.

Wherein, flexible capital portion is provided with the running roller, the running roller cooperatees with inserting board bottom inclined plane, the patchhole has been seted up to equipment seat inner wall, the patchhole cooperatees with inserting the board, the inside diapire of equipment seat is provided with the installation pole, the mounting bracket top is provided with the mounting groove, the installation pole cooperatees and inserts to the mounting groove inner wall, equipment seat top outer wall is connected with annular fixing base.

The top of the mounting frame is connected with a limiting turntable, the bottom of the limiting turntable is provided with a limiting groove, the top of the inserting plate is connected with a limiting rod, the limiting rod is connected to the inner wall of the limiting groove in a sliding mode, and the top of the limiting turntable is connected with a linkage rod with a shifting key.

The top wall inside the assembling seat is rotatably connected with a linkage gear, a driving gear and a transmission gear, the driving gear and the transmission gear are all meshed with the linkage gear, the top of the assembling seat is connected with a motor, the output end of the motor penetrates through the top wall of the assembling seat to be connected with the driving gear, and the bottom of the linkage gear is provided with a linkage groove matched with a linkage rod.

The display device comprises a display panel, a column plate, a hinge, a first fixing bolt, a second fixing bolt and a second display plate, wherein the column plate is in a segmented folding type, the two column plates are connected through the hinge, the side walls of the two sides of the two column plates are respectively provided with the first fixing bolt for unfolding and fixing, the top of the column plate is provided with the second fixing bolt, and the second fixing bolt is used for limiting and fixing a sliding block contained in the second display plate and the column plate.

The stretching assembly comprises a first belt wheel, a second belt wheel and a belt, the first belt wheel and the second belt wheel are rotatably connected to the back of the second display board, and the belt is sleeved on the outer walls of the first belt wheel and the second belt wheel.

The stand board lateral wall is connected with the parking seat, the parking seat is fixed near first show board middle section one side bottom with the belt, the belt is close to first show board avris top outer wall and is connected with the extension seat, the extension seat other end is fixed in second show board lateral wall, extend the seat and pass through sliding block sliding connection in second sliding tray inner wall, it cooperatees with first show board to extend the seat.

The top of the transmission gear is connected with a screw rod, the screw rod penetrates through the top wall of the assembling seat to be connected to the inner wall of the bottom of the first display board, and threads are arranged on the inner wall of the first display board and matched with the screw rod.

Wherein, still including setting up the filling subassembly at first show board and second show board back, the filling subassembly includes gasbag shielding curtain and gas tube, gasbag shielding curtain installs in second show board top, the gas tube is installed in first show board back, the gas tube end of giving vent to anger is connected with the hose, the hose is connected with gasbag shielding curtain charging port.

The inner wall of the inflation tube is provided with a piston, the top of the piston is connected with a pull rod, the pull rod is connected with the inflation tube in a sliding mode, and the bottom of the pull rod is connected to the back of the second display board.

(III) advantageous effects

The invention provides a political thought education display device with a self-fixing structure, which has the beneficial effects that:

1. the parking component is arranged, so that the display device is fixedly installed, temporarily displayed and convenient to disassemble, the problems that most display devices in the prior art are fixed on the ground, and the temporary display and the disassembly and the transportation are inconvenient are solved, the parking component is detachably connected to the bottom of the assembling seat, and the display device is more stable in the temporary display;

2. the extension and contraction of the two groups of display boards are realized through the arranged extension assembly, the problems that the display device in the prior art occupies a large space and is inconvenient to carry are solved, the device is novel in shape and attractive, and the display efficiency is higher;

3. the air filling of the air bag shielding curtain in the stretching process is realized through the arranged filling assembly, and the problems that the shielding curtain in the prior art occupies larger space, has heavier weight and is inconvenient to carry are solved;

4. the display area can be effectively increased and the display information amount can be improved by matching the arranged extension component with the parking component, meanwhile, the stability of the device can be effectively improved by the arranged parking component, the problem that the information amount is less and inconvenient to display in the mode of adopting a poster in the prior art is solved, and the device is stable in structure and convenient to use;

5. through the linkage gear that sets up, drive gear and drive gear, and drive gear all mesh with the linkage gear mutually, simultaneously with screw rod and belt looks linkage, and then can make first show board and second show board from rising at the bottom overlapping dress attitude and become the components of a whole that can function independently show state, thereby can effectively increase the propaganda area, use electronic display screen accessible broadcast animation or propaganda picture, effectively increase the attractiveness of propaganda, also make the propaganda content abundanter, the less problem of mode information volume that adopts the poster among the prior art has been solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of a display surface of a display device for ideological education with a self-fixing structure provided by the present application;

FIG. 2 is a schematic view of the back side of a self-fastening display device for ideological education provided herein;

FIG. 3 is a first schematic view of the extension assembly of the display device for ideological education with a self-fastening structure provided herein;

FIG. 4 is a schematic view of a second embodiment of the display device for ideological education with a self-fastening structure according to the present application;

FIG. 5 is a third schematic view of the construction of the extension module of the display device for ideological education with a self-fastening structure provided herein;

fig. 6 is a first schematic view of a split structure of an assembly seat and a parking component of the display device for ideological education with a self-fixing structure provided by the present application;

fig. 7 is a schematic view of a second split structure of an assembly seat and a parking component of the display device for ideological education with a self-fixing structure provided by the present application;

FIG. 8 is an enlarged view of portion A of FIG. 6 of a self-securing construction for a display device for ideological education provided herein;

fig. 9 is a schematic structural view of a filling assembly of a display device for ideological education having a self-fixing structure according to the present application.

10. Assembling a seat; 110. a motor; 120. a linkage gear; 121. a transmission gear; 122. a drive gear; 123. an insertion hole; 124. a screw; 130. a limiting turntable; 131. a limiting groove; 132. a mounting frame; 133. a limiting rod; 134. an insert plate; 135. a telescopic column; 136. a sliding plate; 137. anti-skid blocks; 140. a moving wheel; 150. a fixed seat; 160. mounting a rod; 161. mounting grooves; 170. a linkage rod; 20. a column plate; 210. a first fixed bolt; 220. a second fixing bolt; 230. a second sliding groove; 240. a first sliding groove; 30. a first display board; 310. an inflation tube; 311. a piston; 312. a pull rod; 313. a hose; 320. a first pulley; 321. a second pulley; 322. a belt; 330. a parking seat; 40. a second display board; 410. an airbag curtain; 420. an extension seat.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Example 1:

as shown in fig. 1, 3, 4, 5, 6, 7 and 8, the present embodiment provides a display device for ideological education having a self-fixing structure, including an assembly base 10 and a column plate 20 connected to the top of the assembly base 10, and further including:

the display device comprises a first display board 30 and a second display board 40, wherein a first sliding groove 240 and a second sliding groove 230 are formed in the inner wall of a stand column board 20, the first display board 30 and the second display board 40 are respectively connected to the inner walls of the first sliding groove 240 and the second sliding groove 230 in a sliding mode through sliding blocks, and electronic display screens are arranged on the display surfaces of the first display board 30 and the second display board 40 and used for increasing the display area, enriching the display content and increasing the display attractiveness;

the parking component is detachably arranged at the bottom of the assembling seat 10 and comprises an installation frame 132, a wedge-shaped insertion plate 134 is connected to the inner wall of the installation frame 132 in a sliding mode, a moving wheel 140 and a sliding plate 136 are connected to the bottom of the installation frame 132, a telescopic column 135 is connected to the inner wall of the sliding plate 136 in a sliding mode, and an anti-skid block 137 is arranged at the bottom of the telescopic column 135 and used for increasing the stability of the temporary exhibition;

the stretching assembly is arranged at the back of the first display board 30 and the second display board 40, and the stretching assembly is matched with the parking assembly and used for increasing the display area and facilitating the disassembly.

The top of the telescopic column 135 is provided with a roller which is matched with the inclined plane at the bottom of the insertion plate 134, the inner wall of the assembly seat 10 is provided with an insertion hole 123, the insertion hole 123 is matched with the insertion plate 134, the bottom wall of the inner part of the assembly seat 10 is provided with an installation rod 160, the top of the installation frame 132 is provided with an installation groove 161, the installation rod 160 can be matched and inserted into the inner wall of the installation groove 161, and the outer wall of the top of the assembly seat 10 is connected with an annular fixed seat 150; the parking component can be arranged at the bottom of the assembling seat 10 according to requirements, so that the device is more stable.

The top of the mounting frame 132 is connected with a limiting turntable 130, the bottom of the limiting turntable 130 is provided with a limiting groove 131, the top of the inserting plate 134 is connected with a limiting rod 133, the limiting rod 133 is connected to the inner wall of the limiting groove 131 in a sliding manner, and the top of the limiting turntable 130 is connected with a linkage rod 170 with a toggle key; the limiting turntable can drive the insertion plate 134 to move through the limiting groove 131.

The top wall inside the assembling seat 10 is rotatably connected with a linkage gear 120, a driving gear 122 and a transmission gear 121, the driving gear 122 and the transmission gear 121 are both meshed with the linkage gear 120, the top of the assembling seat 10 is connected with a motor 110, the output end of the motor 110 penetrates through the top wall of the assembling seat 10 to be connected with the driving gear 122, and the bottom of the linkage gear 120 is provided with a linkage groove matched with a linkage rod 170; the linkage gear can be matched with the linkage rod 170 through the linkage groove to drive the limiting turntable to rotate.

The upright column plate 20 is in a segmented folding type, the two sections of upright column plates 20 are connected through hinges, the side walls of the two sides of the two sections of upright column plates 20 are respectively provided with a first fixing bolt 210 for unfolding and fixing, the top of the upright column plate 20 is provided with a second fixing bolt 220, and the second fixing bolt 220 is used for limiting and fixing a sliding block contained in the second display plate 40 and the upright column plates 20; set up stand board 20 into folded cascade, be convenient for dismantle the transport to this device to occupation space can be effectively reduced.

The stretching assembly comprises a first belt wheel 320, a second belt wheel 321 and a belt 322, wherein the first belt wheel 320 and the second belt wheel 321 are rotatably connected to the back of the second display board 40, and the belt 322 is sleeved on the outer walls of the first belt wheel 320 and the second belt wheel 321.

The side wall of the upright post plate 20 is connected with a parking seat 330, the parking seat 330 is fixed with the bottom of one side of the belt 322 close to the middle section of the first display plate 30, the outer wall of the belt 322 close to the top of the side of the first display plate 30 is connected with an extension seat 420, the other end of the extension seat 420 is fixed on the side wall of the second display plate 40, the extension seat 420 is connected with the inner wall of the second sliding groove 230 in a sliding manner through a sliding block, and the extension seat 420 is matched with the first display plate 30; the first display board 30 ascends the second display board 40 faster by the belt 322 while the first display board 30 and the second display board 40 ascend.

The top of the transmission gear 121 is connected with a screw 124, the screw 124 passes through the top wall of the assembly base 10 and is connected to the inner wall of the bottom of the first display board 30, and the inner wall of the first display board 30 is provided with threads matched with the screw 124; the first display board 30 is lifted by the screw 124.

When the device is used, after the device is moved to a designated position, the upright post plate 20 can be fixedly connected to the ground through the fixing seat 150, and a parking component can also be arranged at the bottom of the assembly seat 10, so that the whole device can be conveniently moved, when the parking component is arranged, the mounting rod 160 at the bottom of the assembly seat 10 is firstly inserted into the mounting groove 161 at the top of the mounting frame 132, the linkage rod 170 at the top of the limit turntable 130 is inserted into the linkage groove on the linkage gear, the upright post plate 20 is turned to a vertical state from a turning state through a hinge and is fixed by the first fixing bolts 210 at two sides, after the completion, the motor 110 is started, the output end of the motor 110 is meshed with the driving gear 122 to drive the linkage gear 121 and the transmission gear 120 to rotate, when the linkage gear 121 rotates, the linkage gear drives the limit turntable 130 to rotate through the cooperation of the linkage groove and the linkage rod 170, the limit turntable 130 enables the limit rod 133 to slide on the inner wall of the limit groove 131 through the arc limit groove 131, the insertion plate 134 is driven to slide towards the outer side of the mounting frame 132, the insertion plate 134 is inserted into the insertion hole 123, so that the parking assembly is fixed at the bottom of the assembling seat 10, meanwhile, the wedge-shaped inclined plane at the bottom of the insertion plate 134 gradually presses the roller to enable the telescopic column 135 to move downwards, the anti-skid block 137 at the bottom of the telescopic column 135 contacts the ground and enables the moving wheel 140 to be separated from the ground, and therefore the device stops moving and can be more stable; when transmission gear 121 rotates, transmission gear 121 can drive screw 124 and rotate, screw 124 drives first show board 30 through the screw thread and rises, first show board 30 rises and can drive first band pulley 320 and second band pulley 321 to rise, and because belt 322 is fixed with stopping seat 330, make belt 322 rotate, belt 322 rotates and can drive and extend seat 420 and rise, and then drive second show board 40 and rise, thereby make first show board 30 and second show board 40 rise to become the components of a whole that can function independently show state from the overlapping state in the bottom, thereby can effectively increase the propaganda area, use electronic display screen accessible broadcast animation or propaganda picture, effectively increase the attractiveness of propaganda, also make propaganda content abundanter.

Example 2:

as shown in fig. 2 and fig. 9, as a preferred embodiment, on the basis of the above manner, further, the display device further comprises a filling assembly disposed at the back of the first display board 30 and the second display board 40, the filling assembly comprises an airbag curtain 410 and an inflation tube 310, the airbag curtain 410 is mounted at the top of the second display board 40, the inflation tube 310 is mounted at the back of the first display board 30, the air outlet end of the inflation tube 310 is connected with a hose 313, and the hose 313 is connected with the inflation port of the airbag curtain 410.

The inner wall of the inflation tube 310 is provided with a piston 311, the top of the piston 311 is connected with a pull rod 312, the pull rod 312 is connected with the inflation tube 310 in a sliding manner, and the bottom of the pull rod 312 is connected to the back of the second display board 40.

When the device is used, when the second display board 30 continuously rises beyond the rising speed of the first display board 40, the second display board 30 can drive the pull rod 312 to rise, the gas inside the inflation tube 310 is compressed by the hose 313 to enter the airbag shielding curtain 410 through the cooperation of the piston 311, so that the inside of the airbag shielding curtain 410 is inflated and unfolded, the device is shielded, and the gas can also retract along with the falling of the second display board 40, so that the occupied space of the device is reduced, and the device is convenient to assemble and carry.

The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.

Claims

1. A display device for ideological education with a self-fixing structure, comprising an assembly base (10) and a post plate (20) connected to the top of the assembly base (10), characterized in that it further comprises:

the display device comprises a first display board (30) and a second display board (40), wherein a first sliding groove (240) and a second sliding groove (230) are formed in the inner wall of a column board (20), the first display board (30) and the second display board (40) are respectively connected to the inner walls of the first sliding groove (240) and the second sliding groove (230) in a sliding mode through sliding blocks, electronic display screens are mounted on the display surfaces of the first display board (30) and the second display board (40) and used for increasing the display area, enriching the display content and increasing the display attractiveness;

the parking component is detachably arranged at the bottom of the assembling seat (10), the parking component comprises an installation frame (132), the inner wall of the installation frame (132) is connected with a wedge-shaped insertion plate (134) in a sliding mode, the bottom of the installation frame (132) is connected with a moving wheel (140) and a sliding plate (136), the inner wall of the sliding plate (136) is connected with a telescopic column (135) in a sliding mode, and the bottom of the telescopic column (135) is provided with an anti-skid block (137) used for increasing the stability of the assembly seat during temporary display;

the stretching assembly is arranged at the back of the first display board (30) and the back of the second display board (40), and the stretching assembly is matched with the parking assembly and used for increasing the display area and facilitating disassembly.

2. The display device for political thought education with self-fixing structure according to claim 1, wherein the top of the telescopic column (135) is provided with a roller wheel which is matched with the bottom slope of the insertion plate (134), the inner wall of the assembly seat (10) is provided with an insertion hole (123), the insertion hole (123) is matched with the insertion plate (134), the inner bottom wall of the assembly seat (10) is provided with a mounting rod (160), the top of the mounting rack (132) is provided with a mounting groove (161), the mounting rod (160) can be matched and inserted into the inner wall of the mounting groove (161), and the outer wall of the top of the assembly seat (10) is connected with the annular fixing seat (150).

3. The display device for political thought education with self-fixing structure according to claim 1, wherein a limiting rotary table (130) is connected to the top of the mounting frame (132), a limiting groove (131) is formed in the bottom of the limiting rotary table (130), a limiting rod (133) is connected to the top of the inserting plate (134), the limiting rod (133) is connected to the inner wall of the limiting groove (131) in a sliding mode, and a linkage rod (170) with a toggle key is connected to the top of the limiting rotary table (130).

4. The display device for think political affairs education with from fixed knot structure of claim 1, characterized in that, the inside roof of equipment seat (10) rotates and is connected with linkage gear (120), drive gear (122) and drive gear (121) all mesh with linkage gear (120), equipment seat (10) top is connected with motor (110), motor (110) output passes equipment seat (10) roof and is connected with drive gear (122), linkage groove and gangbar (170) cooperate have been seted up to linkage gear (120) bottom.

5. The display device for political thought education with the self-fixing structure as claimed in claim 1, wherein the column plate (20) is of a sectional folding type, the two sections of column plates (20) are connected through hinges, the side walls of the two sections of column plates (20) are provided with first fixing bolts (210) for unfolding and fixing, the top of the column plate (20) is provided with second fixing bolts (220), and the second fixing bolts (220) are used for limiting and fixing sliding blocks contained in the second display plate (40) and the column plates (20).

6. The display device for political thinking education with the self-fixing structure as claimed in claim 1, wherein the extension component comprises a first belt wheel (320), a second belt wheel (321) and a belt (322), the first belt wheel (320) and the second belt wheel (321) are both rotatably connected to the back of the second display board (40), and the belt (322) is sleeved on the outer walls of the first belt wheel (320) and the second belt wheel (321).

7. The display device for political thought education with the self-fixing structure as claimed in claim 6, wherein the standing still seat (330) is connected to the side wall of the column plate (20), the standing still seat (330) is fixed with the belt (322) near the bottom of the middle section of the first display plate (30), the belt (322) is connected with the extension seat (420) near the top of the first display plate (30), the other end of the extension seat (420) is fixed on the side wall of the second display plate (40), the extension seat (420) is connected with the inner wall of the second sliding groove (230) in a sliding manner through a sliding block, and the extension seat (420) is matched with the first display plate (30).

8. The display apparatus for political thinking education as claimed in claim 4, wherein a screw rod (124) is connected to the top of the driving gear (121), the screw rod (124) is connected to the inner bottom wall of the first display board (30) through the top wall of the assembling seat (10), and the inner wall of the first display board (30) is provided with threads to match with the screw rod (124).

9. The display device for the political thought education with the self-fixing structure according to claim 1, further comprising a filling assembly arranged at the back of the first display board (30) and the second display board (40), wherein the filling assembly comprises an air bag curtain (410) and an inflation tube (310), the air bag curtain (410) is arranged at the top of the second display board (40), the inflation tube (310) is arranged at the back of the first display board (30), the air outlet end of the inflation tube (310) is connected with a hose (313), and the hose (313) is connected with the inflation port of the air bag curtain (410).

10. The display device for political thought education with self-fixing structure according to claim 9, wherein the piston (311) is arranged on the inner wall of the gas filled tube (310), the top of the piston (311) is connected with a pull rod (312), the pull rod (312) is connected with the gas filled tube (310) in a sliding way, and the bottom of the pull rod (312) is connected with the back of the second display board (40).