Propaganda device applied to health education

Abstract

The invention provides a propaganda device applied to health education, and relates to the technical field of health education propaganda, the propaganda device comprises a first display board, the other end of the first display board is provided with a second display board, a splicing structure is arranged between the first display board and the second display board, a third display board is arranged between the first display board and the second display board, and the third display board is provided with a plurality of through holes. The side, close to the second display board, of the third display board is fixedly connected with a butt-joint wedge block, a locking wedge groove is formed in the butt-joint wedge block, and by arranging an assembling structure, the number of the publicity boards can be automatically increased or decreased according to the length of the publicity newspaper, so that the publicity board can adapt to publicity newspaper of various sizes for residents to watch; the publicity newspaper is directly and completely displayed on the publicity board, the display is more intuitive, the practicability of the device is improved, the public health publicity effect is ensured, and the problems that the use area of the publicity device is limited, and the publicity device cannot adapt to various publicity newspaper with different lengths are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of health education propaganda, and in particular to a propaganda device applied to health education. Background Art

[0002] Public health culture refers to the values ​​and concepts believed in and put into practice in the field of public health. Specifically, it includes the prevention, monitoring and treatment of major diseases, especially infectious diseases; supervision and control of food, drugs and public environmental hygiene; as well as related health publicity, health education, immunization, etc.

[0003] Based on the above, some shortcomings are still found in the process of promoting public health: First, the sizes of propaganda newspapers vary, and the area that can be used for propaganda devices is limited, which leads to great disadvantages in use.

[0004] Second, the existing propaganda devices require residents to turn the pages themselves, so that the propaganda newspaper cannot be fully displayed, resulting in poor display effects, not enough to attract residents to watch, and affecting the propaganda effect.

[0005] Third, most of the current promotional newspapers are directly glued to the promotional devices with glue, which makes it difficult to tear them off and replace them later, and it is easy to cause pollution to the promotional devices. Summary of the invention

[0006] In view of this, the present invention provides a propaganda device used for health education, which can add or reduce propaganda boards according to the length of the propaganda newspapers through the setting of the assembly structure, so that it can adapt to propaganda newspapers of various sizes for residents to watch, and make the propaganda newspapers directly displayed on the propaganda boards, which is more intuitive, not only improving the practicality of the device, but also ensuring the public health propaganda effect. Through the setting of the portable installation structure, the four sides of the propaganda newspaper are provided with through holes, and then the propaganda newspaper can be directly installed in a limited position in accordance with the through holes of the propaganda newspaper, abandoning the glue sticking method, thereby reducing the pollution to the propaganda device.

[0007] The present invention provides a propaganda device for health education, which specifically comprises: a first display board; A second display plate is provided at the other end of the first display plate, an assembly structure is provided between the first display plate and the second display plate, the assembly structure comprising a third display plate, a docking wedge, a locking wedge groove, a docking slot, a movable sliding hole, a movable sliding column, a locking wedge, a movable slot, an extrusion convex ring, an extrusion slot, a first spring and a pull handle, a third display plate is provided between the first display plate and the second display plate, and a docking wedge is fixedly connected to a side of the third display plate close to the second display plate, a locking wedge groove is provided on the docking wedge, a docking slot is provided on a side of the third display plate close to the first display plate, and A movable sliding hole is provided inside the third display plate at the docking slot, and a movable sliding column is slidably installed inside the movable sliding hole, and a locking wedge is fixedly connected to one end of the movable sliding column. At the same time, a movable groove is provided inside the third display plate, and an extrusion convex ring is fixedly connected to the outer side of the movable sliding column, and an extrusion slot hole is provided inside the third display plate, and the inner side wall of the extrusion slot hole is fitted with the outer side wall of the extrusion convex ring. A first spring is provided inside the extrusion slot hole, and the first spring is sleeved on the outer side of the movable sliding column. At the same time, one end of the outer side of the movable sliding column passes through the third display plate and is fixedly connected to the pull handle.

[0008] In at least some embodiments, the right side of the first display board is provided with the same structure as the right side of the third display board, and the left side of the second display board is provided with the same structure as the left side of the third display board, and the docking wedge block is inserted into the docking slot, and the locking wedge block is fitly mounted in the locking wedge groove.

[0009] In at least some embodiments, a connecting support block is fixedly connected to the left side of the first display board and the right side of the second display board, the other end of the connecting support block is fixedly connected to a supporting vertical rod, the top of the supporting vertical rod is fixedly connected to a connecting top column, and the bottom of the supporting vertical rod is fixedly connected to a bearing bottom plate, and the bottom of the bearing bottom plate is fixedly connected to two sets of universal wheels.

[0010] In at least some embodiments, a portable installation structure is provided on the left side of the first display board and the right side of the second display board, and the portable installation structure includes a movable groove, a fixed cross bar, a second spring, a movable pressure block and a sliding through hole. Two groups of movable grooves are respectively provided on the left side of the first display board and the upper and lower ends of the right side of the second display board. The interior of the movable groove is fixedly connected to the fixed cross bar, and the outer side of the fixed cross bar is sleeved with the second spring. A movable pressure block is provided on the rear side of the movable groove, and a sliding through hole is provided on the movable pressure block. At the same time, the movable pressure block is slidably installed on the outer side of the fixed cross bar through the sliding through hole.

[0011] In at least some embodiments, one outer end of the movable pressing block is fixedly connected to a fixed connecting plate, and a connecting support plate is fixedly connected to the middle of the front end of the fixed connecting plate, and a limiting plug column is fixedly connected to the end of the connecting support plate.

[0012] In at least some embodiments, a connecting rod is fixedly connected between the fixed connecting plates, a connecting pull frame is fixedly connected to the middle of the rear side of the connecting rod, and a limited pull groove is provided in the middle of the connecting pull frame.

[0013] In at least some embodiments, a limiting structure is provided inside the first display board and the second display board, and the limiting structure includes a mounting support groove, an electromagnet block, a connecting slide rod and a third spring. A mounting support groove is opened inside the first display board and the second display board, and an electromagnet block is fixedly installed at one end of the inner side of the mounting support groove. A connecting slide rod is fixedly connected between the end surface of the electromagnet block and the mounting support groove, and the outer side of the connecting slide rod is sleeved with the third spring.

[0014] In at least some embodiments, a movable plate is provided inside the mounting support groove, and guide lugs are fixedly connected to the upper and lower ends of the movable plate, and a guide slide hole is provided on the guide lug. A limiting plug is fixedly connected to one outer end of the movable plate, and the limiting plug is inserted into the limiting pull groove.

[0015] The invention provides a health education propaganda device, which has the following beneficial effects: 1. The present invention is provided with an assembling structure. First, the third display board is added according to the length of the propaganda newspaper until the propaganda newspaper is fully displayed. Then, the docking wedge on the right side of the third display board is inserted into the docking slot. At the same time, the docking wedge moves by squeezing the locking wedge through the inclined surface when moving. The locking wedge makes the extrusion convex ring squeeze the first spring in the extrusion slot hole through the movable sliding column. When the locking wedge is not squeezed, the first spring generates elastic force to push the extrusion convex ring to move. The extrusion convex ring drives the locking wedge to reset and be inserted into the locking wedge groove through the movable sliding column, thereby completing the assembly. For subsequent disassembly, it only needs to pull the handle to drive the locking wedge to disengage from the locking wedge groove through the movable sliding column, so as to facilitate subsequent storage, which not only improves the practicality of the propaganda device, but also ensures the public health propaganda effect.

[0016] 2. The present invention is provided with a portable installation structure, which drives the connecting support rod to move by pulling the connecting pull frame, and the connecting support rod drives the fixed connecting plate to move, and the fixed connecting plate drives the moving pressure block to squeeze the second spring on the fixed cross bar, and then aligns the through holes at the four corners of the propaganda newspaper with the limiting plug column, and then releases the connecting pull frame. Because the second spring is elastically deformed when the moving pressure block squeezes it, the second spring pushes the moving pressure block to reset, so that the limiting plug column is inserted into the through hole at the corner of the propaganda newspaper, and then the installation is completed, the glue sticking method is abandoned, and the pollution to the propaganda device is reduced.

[0017] 3. The present invention prevents residents from accidentally touching the connection pull frame and causing the propaganda poster to fall, thereby ensuring the stability of the installation of the propaganda poster. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0019] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0020] In the attached picture: Figure 1 Shows a schematic diagram of the overall structure according to the present invention; Figure 2 It shows a schematic diagram of the split structure of the first display board, the second display board and the third display board according to the present invention; Figure 3 A schematic diagram of an assembly structure according to the present invention is shown; Figure 4 It shows that according to the present invention Figure 3 The enlarged structural diagram at A in the middle; Figure 5 A schematic diagram showing a portable installation structure and a limiting structure according to the present invention is shown; Figure 6 A schematic diagram of some components of a portable installation structure according to the present invention is shown; Figure 7 A schematic diagram showing connecting rods and connecting pull frames in a portable installation structure according to the present invention is shown; Figure 8 A schematic diagram of a limiting structure according to the present invention is shown; Fig. 9 A schematic diagram of a fixing structure according to the present invention is shown.

[0021] Reference numerals list 1. The first display board; 101, second display board; 102, connecting support block; 1021, supporting vertical rod; 10211, first connecting rod; 10212, rotating shaft; 10213, second connecting rod; 1022, connecting top column; 103, bearing bottom plate; 1031, universal wheel; 2. Assemble the structure; 201, third display board; 2011, docking wedge; 2012, locking wedge groove; 202, docking slot; 2021, movable sliding hole; 2022, movable sliding column; 2023, locking wedge; 2024, movable groove; 2025, extrusion convex ring; 2026, extrusion slot hole; 2027, first spring; 2028, pull handle; 3. Portable installation structure; 301, movable slot; 3011, fixed cross bar; 3012, second spring; 302, movable pressing block; 3021, sliding through hole; 303, fixed connecting plate; 3031, connecting support plate; 3032, limiting plug column; 304, connecting support rod; 3041, connecting pull frame; 3042, limiting pull groove; 4. Limiting structure; 401, mounting support slot; 4011, electromagnet block; 4012, connecting slide bar; 4013, third spring; 402, movable piece; 4021, guide lug; 4022, guide sliding hole; 4023, limit plug. DETAILED DESCRIPTION

[0022] Example: Please refer to Figures 1 to 8 : The present invention proposes a publicity device for health education, comprising: a first display board 1; The other end of the first display board 1 is provided with a second display board 101, and an assembly structure 2 is provided between the first display board 1 and the second display board 101. The assembly structure 2 includes a third display board 201, a docking wedge 2011, a locking wedge groove 2012, a docking slot 202, a movable sliding hole 2021, a movable sliding column 2022, a locking wedge 2023, a movable groove 2024, an extrusion convex ring 2025, an extrusion slot 2026, a first spring 2027 and a pull handle 2028. The third display board 201 is provided between the first display board 1 and the second display board 101, and a docking wedge 2011 is fixedly connected to a side of the third display board 201 close to the second display board 101, and a locking wedge groove 2012 is provided on the docking wedge 2011. The third display board 20 A docking slot 202 is provided on one side close to the first display board 1, and a movable sliding hole 2021 is provided inside the third display board 201 at the docking slot 202, a movable sliding post 2022 is slidably installed inside the movable sliding hole 2021, and a locking wedge 2023 is fixedly connected to one end of the movable sliding post 2022. At the same time, a movable groove 2024 is provided inside the third display board 201, and an extrusion convex ring 2025 is fixedly connected to the outer side of the movable sliding post 2022, and an extrusion slot 2026 is provided inside the third display board 201, and the inner side wall of the extrusion slot 2026 is fitted with the outer side wall of the extrusion convex ring 2025, and a first spring 2027 is provided inside the extrusion slot 2026, and the first spring 2027 is sleeved on the movable The outer side of the sliding column 2022, and one end of the outer side of the movable sliding column 2022 passes through the third display board 201 and is fixedly connected to the handle 2028. The right side of the first display board 1 is provided with the same structure as the right side of the third display board 201, and the left side of the second display board 101 is provided with the same structure as the left side of the third display board 201. At the same time, the docking wedge block 2011 is inserted into the docking slot 202, and the locking wedge block 2023 is fitted and mounted in the locking wedge groove 2012. The left side of the first display board 1 and the right side of the second display board 101 are fixedly connected with the connecting support block 102, and the other end of the connecting support block 102 is fixedly connected to the supporting vertical rod 1021, and the top of the supporting vertical rod 1021 is fixedly connected to the connecting top column 1022, and the bottom of the supporting vertical rod 1021 is fixedly connected to The bearing bottom plate 103 is connected, and two sets of universal wheels 1031 are fixedly connected at the bottom of the bearing bottom plate 103. The docking wedge 2011 on the right side of the third display plate 201 is inserted into the docking slot 202 of the second display plate 101. At the same time, the docking wedge 2011 squeezes the locking wedge 2023 through the inclined surface when moving. The locking wedge 2023 squeezes the first spring 2027 in the squeezing slot 2026 through the movable sliding column 2022. When the locking wedge 2023 cannot be squeezed, the first spring 2027 generates elastic force to push the squeezing convex ring 2025 to move. The squeezing convex ring 2025 drives the locking wedge 2023 to reset and be inserted into the locking wedge slot 2012 through the movable sliding column 2022, thereby completing the assembly.When disassembling it later, it is only necessary to pull the handle 2028 to drive the locking wedge block 2023 out of the locking wedge groove 2012 through the movable slide column 2022, and then it can be disassembled.

[0023] Embodiment 2: Based on Embodiment 1, Figure 5 , Figure 6 and Figure 7 As shown, a portable installation structure 3 is provided on the left side of the first display board 1 and the right side of the second display board 101. The portable installation structure 3 includes a movable groove 301, a fixed cross bar 3011, a second spring 3012, a movable pressing block 302 and a sliding through hole 3021. Two sets of movable grooves 301 are respectively provided at the upper and lower ends of the left side of the first display board 1 and the right side of the second display board 101. The interior of the movable groove 301 is fixedly connected with a fixed cross bar 3011, and the outer side of the fixed cross bar 3011 is sleeved with a second spring 301. 2. A moving pressing block 302 is provided at the rear side of the moving groove 301. A sliding through hole 3021 is provided on the moving pressing block 302. The moving pressing block 302 is slidably installed on the outer side of the fixed cross bar 3011 through the sliding through hole 3021. A fixed connecting plate 303 is fixedly connected to one end of the outer side of the moving pressing block 302. A connecting support plate 3031 is fixedly connected to the middle of the front end of the fixed connecting plate 303. At the same time, a limited position plug column 3032 is fixedly connected to the end of the connecting support plate 3031. The fixed connecting plates 303 are fixedly connected to each other. A connecting rod 304 is connected, and a connecting frame 3041 is fixedly connected to the middle of the rear side of the connecting rod 304. At the same time, a limited position drawing groove 3042 is provided in the middle of the connecting frame 3041. The connecting rod 304 is driven to move by pulling the connecting frame 3041, and the connecting rod 304 drives the fixed connecting plate 303 to move. The fixed connecting plate 303 drives the moving pressing block 302 to squeeze the second spring 3012 on the fixed cross bar 3011, and then aligns the through holes at the four corners of the propaganda newspaper with the limiting plug posts 3032. The second spring 3012 is aligned, and then the connecting pull frame 3041 is released. Because the movable pressing block 302 squeezes the second spring 3012 to cause elastic deformation of the second spring 3012, the second spring 3012 pushes the movable pressing block 302 to reset, so that the limiting plug 3032 is inserted into the corner through hole of the propaganda newspaper, and then the installation is completed. Preferably, the propaganda newspaper can also be pasted on the first display board or the second display board or the third display board. Of course, for the propaganda newspaper displayed for a long time, the first method is preferably used for fixing.

[0024] Embodiment 3: Based on Embodiment 1 and Embodiment 2, Figure 8As shown, the first display board 1 and the second display board 101 are provided with a limiting structure 4 inside, and the limiting structure 4 includes a mounting support groove 401, an electromagnet block 4011, a connecting slide bar 4012 and a third spring 4013. The first display board 1 and the second display board 101 are provided with a mounting support groove 401 inside, and the electromagnet block 4011 is fixedly installed at one end of the inner side of the mounting support groove 401, and a connecting slide bar 4012 is fixedly connected between the end surface of the electromagnet block 4011 and the mounting support groove 401, and the outer side of the connecting slide bar 4012 is sleeved with a third spring 4013. A moving sheet 402 is provided inside the mounting support groove 401, and the upper and lower ends of the moving sheet 402 are fixedly connected with guide lugs 4021, and the guide lugs 4021 are provided with guide sliding holes 4022. The outer end of the moving sheet 402 is fixedly connected to the limiting structure 402. Insert block 4023, and the limit insert block 4023 is inserted into the limit groove 3042 at the same time. When replacing the propaganda newspaper, it is necessary to start the electromagnet block 4011 to drive the movable piece 402 to move under the action of magnetic attraction, and the movable piece 402 drives the limit insert block 4023 to disengage from the limit groove 3042, and then the connecting pull frame 3041 can be pulled. After the replacement is completed, the electromagnet block 4011 is closed. Because the movable piece 402 squeezes the third spring 4013 on the connecting slide rod 4012 through the guide lug 4021 when moving, so that the third spring 4013 produces elastic deformation, thereby pushing the movable piece 402 to move, and the movable piece 402 drives the limit insert block 4023 to reset and be inserted into the limit groove 3042, so as to prevent residents from accidentally touching the connecting pull frame 3041 and causing the propaganda newspaper to fall, thereby ensuring the stability of the propaganda newspaper after installation.

[0025] Preferably, a fixing assembly is provided on the inner side of the supporting vertical rod 1021, and the fixing assembly includes a first connecting rod 10211 and a second connecting rod 10213. The first connecting rod is rotatably connected to the second connecting rod via a rotating shaft 10212, and the first connecting rod and the second connecting rod (in non-rotated state) are vertically arranged to the supporting vertical rod.

[0026] As configured above, when the device is in use, if strong winds occur, the second connecting rod can be rotated and inserted into the corresponding ground, or a larger counterweight block can be provided on the second connecting rod to better enable the entire device to withstand strong winds to a certain extent.

[0027] Specific usage and function of this embodiment: In the present invention, firstly, the third display board 201 is added according to the length of the propaganda newspaper until the propaganda newspaper is fully displayed, and then the docking wedge 2011 on the right side of the third display board 201 is inserted into the docking slot 202 of the second display board 101, and at the same time, the docking wedge 2011 squeezes the locking wedge 2023 through the inclined surface when moving, and the locking wedge 2023 squeezes the first spring 2027 in the squeezing slot 2026 through the movable sliding column 2022. When the locking wedge 2023 cannot be squeezed, the first spring 2027 generates elastic force to push the squeezing convex ring 2025 to move, and the squeezing convex ring 2025 drives the locking wedge 2023 to reset and be inserted into the locking wedge slot 2012 through the movable sliding column 2022, thereby completing the assembly, which not only improves The practicality of the publicity device is high, and the public health publicity effect is guaranteed. Then, by pulling the connecting pull frame 3041, the connecting support rod 304 is driven to move, and the connecting support rod 304 drives the fixed connecting plate 303 to move, and the fixed connecting plate 303 drives the moving pressure block 302 to squeeze the second spring 3012 on the fixed cross bar 3011, and then the through holes at the four corners of the publicity newspaper are aligned with the limiting plug column 3032, and then the connecting pull frame 3041 is released, because the moving pressure block 302 squeezes the second spring 3012 to cause the second spring 3012 to produce elastic deformation, so that the second spring 3012 pushes the moving pressure block 302 to reset, so that the limiting plug column 3032 is inserted into the corner through hole of the publicity newspaper, and then the publicity newspaper is fully displayed, so that residents can watch it more intuitively, and at the same time, the glue adhesion installation method is abandoned to reduce the pollution to the publicity device.

Claims

1. A propaganda device for health education, comprising: First display board (1); A second display board (101) is provided at the other end of the first display board (1); the feature is that an assembly structure (2) is provided between the first display board (1) and the second display board (101), the assembly structure (2) comprising a third display board (201), a docking wedge block (2011), a locking wedge groove (2012), a docking slot (202), a movable sliding hole (2021), a movable sliding column (2022), a locking wedge block (2023), a movable groove (2024), an extrusion convex ring (2011), and a locking wedge block (2023). 25), an extrusion slot (2026), a first spring (2027) and a pull handle (2028), a third display plate (201) is provided between the first display plate (1) and the second display plate (101), and a docking wedge (211) is fixedly connected to a side of the third display plate (201) close to the second display plate (101), a locking wedge groove (212) is provided on the docking wedge (211), and a locking wedge groove (212) is provided on a side of the third display plate (201) close to the first display plate (1). A docking slot (202) is provided, and a movable sliding hole (221) is provided inside the third display plate (201) at the docking slot (202), a movable sliding column (222) is slidably installed inside the movable sliding hole (221), a locking wedge (223) is fixedly connected to one end of the movable sliding column (222), and a movable groove (224) is provided inside the third display plate (201), and an extrusion convex ring (2023) is fixedly connected to the outer side of the movable sliding column (222). 5), and an extrusion slot (2026) is provided inside the third display plate (201), and the inner wall of the extrusion slot (2026) is in contact with the outer wall of the extrusion convex ring (2025), a first spring (2027) is provided inside the extrusion slot (2026), and the first spring (2027) is sleeved on the outer side of the movable sliding column (2022), and one end of the outer side of the movable sliding column (2022) passes through the third display plate (201) and is fixedly connected to the pull handle (2028).

2. A health education propaganda device according to claim 1, characterized in that: The right side of the first display board (1) is provided with a structure identical to the right side of the third display board (201), and the left side of the second display board (101) is provided with a structure identical to the left side of the third display board (201), and the docking wedge block (2011) is inserted into the docking slot (202), and the locking wedge block (2023) is fitted and snap-fitted into the locking wedge groove (2012).

3. A health education propaganda device according to claim 1, characterized in that: A connecting support block (102) is fixedly connected to the left side of the first display board (1) and the right side of the second display board (101); the other end of the connecting support block (102) is fixedly connected to a supporting vertical rod (1021); the top of the supporting vertical rod (1021) is fixedly connected to a connecting top column (1022); and the bottom of the supporting vertical rod (1021) is fixedly connected to a bearing bottom plate (103); and the bottom of the bearing bottom plate (103) is fixedly connected to two sets of universal wheels (1031).

4. The propaganda device for health education according to claim 1, characterized in that: A portable installation structure (3) is provided on the left side of the first display board (1) and the right side of the second display board (101). The portable installation structure (3) comprises a movable groove (301), a fixed cross bar (3011), a second spring (3012), a movable pressure block (302) and a sliding through hole (3021). Two groups of movable grooves (301) are respectively provided at the upper and lower ends of the left side of the first display board (1) and the right side of the second display board (101). The interior of the movable groove (301) is fixedly connected to a fixed cross bar (3011). The outer side of the fixed cross bar (3011) is sleeved with a second spring (3012). A movable pressure block (302) is provided on the rear side of the movable groove (301). The movable pressure block (302) is provided with a sliding through hole (3021). The movable pressure block (302) is slidably installed on the outer side of the fixed cross bar (3011) through the sliding through hole (3021).

5. A propaganda device for health education according to claim 4, characterized in that: One end of the outer side of the movable pressing block (302) is fixedly connected to a fixed connecting plate (303), and the middle of the front end of the fixed connecting plate (303) is fixedly connected to a connecting support plate (3031), while the end of the connecting support plate (3031) is fixedly connected to a limiting plug post (3032).

6. A propaganda device for health education according to claim 5, characterized in that: A connecting rod (304) is fixedly connected between the fixed connecting plates (303), a connecting pull frame (3041) is fixedly connected to the middle of the rear side of the connecting rod (304), and a limiting pull groove (3042) is provided in the middle of the connecting pull frame (3041).

7. The propaganda device for health education according to claim 1, characterized in that: A limiting structure (4) is provided inside the first display board (1) and the second display board (101), and the limiting structure (4) comprises a mounting support groove (401), an electromagnet block (4011), a connecting slide bar (4012) and a third spring (4013). The first display board (1) and the second display board (101) are provided with a mounting support groove (401) inside, an electromagnet block (4011) is fixedly installed at one end of the inner side of the mounting support groove (401), a connecting slide bar (4012) is fixedly connected between the end surface of the electromagnet block (4011) and the mounting support groove (401), and the outer side of the connecting slide bar (4012) is sleeved with the third spring (4013).

8. A health education propaganda device according to claim 7, characterized in that: A movable sheet (402) is provided inside the mounting support groove (401), and the upper and lower ends of the movable sheet (402) are fixedly connected with guide lugs (4021), and a guide sliding hole (4022) is provided on the guide lug (4021). An outer end of the movable sheet (402) is fixedly connected with a limiting plug block (4023), and the limiting plug block (4023) is inserted into the limiting pull groove (3042).

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